OSCL-LXR linux-6.0.1/​drivers/​hwmon/​pmbus/​pmbus_core.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Hardware monitoring driver for PMBus devices
  *
  * Copyright (c) 2010, 2011 Ericsson AB.
  * Copyright (c) 2012 Guenter Roeck
  */
 
 #include <linux/debugfs.h>
 #include <linux/kernel.h>
 #include <linux/math64.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
 #include <linux/pmbus.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #include <linux/of.h>
 #include <linux/thermal.h>
 #include "pmbus.h"
 
 /*
  * Number of additional attribute pointers to allocate
  * with each call to krealloc
  */
 #define PMBUS_ATTR_ALLOC_SIZE   32
 #define PMBUS_NAME_SIZE     24
 
 struct pmbus_sensor {
     struct pmbus_sensor *next;
     char name[PMBUS_NAME_SIZE]; /* sysfs sensor name */
     struct device_attribute attribute;
     u8 page;        /* page number */
     u8 phase;       /* phase number, 0xff for all phases */
     u16 reg;        /* register */
     enum pmbus_sensor_classes class;    /* sensor class */
     bool update;        /* runtime sensor update needed */
     bool convert;       /* Whether or not to apply linear/vid/direct */
     int data;       /* Sensor data.
                    Negative if there was a read error */
 };
 #define to_pmbus_sensor(_attr) \
     container_of(_attr, struct pmbus_sensor, attribute)
 
 struct pmbus_boolean {
     char name[PMBUS_NAME_SIZE]; /* sysfs boolean name */
     struct sensor_device_attribute attribute;
     struct pmbus_sensor *s1;
     struct pmbus_sensor *s2;
 };
 #define to_pmbus_boolean(_attr) \
     container_of(_attr, struct pmbus_boolean, attribute)
 
 struct pmbus_label {
     char name[PMBUS_NAME_SIZE]; /* sysfs label name */
     struct device_attribute attribute;
     char label[PMBUS_NAME_SIZE];    /* label */
 };
 #define to_pmbus_label(_attr) \
     container_of(_attr, struct pmbus_label, attribute)
 
 /* Macros for converting between sensor index and register/page/status mask */
 
 #define PB_STATUS_MASK  0xffff
 #define PB_REG_SHIFT    16
 #define PB_REG_MASK 0x3ff
 #define PB_PAGE_SHIFT   26
 #define PB_PAGE_MASK    0x3f
 
 #define pb_reg_to_index(page, reg, mask)    (((page) << PB_PAGE_SHIFT) | \
                          ((reg) << PB_REG_SHIFT) | (mask))
 
 #define pb_index_to_page(index)         (((index) >> PB_PAGE_SHIFT) & PB_PAGE_MASK)
 #define pb_index_to_reg(index)          (((index) >> PB_REG_SHIFT) & PB_REG_MASK)
 #define pb_index_to_mask(index)         ((index) & PB_STATUS_MASK)
 
 struct pmbus_data {
     struct device *dev;
     struct device *hwmon_dev;
 
     u32 flags;      /* from platform data */
 
     int exponent[PMBUS_PAGES];
                 /* linear mode: exponent for output voltages */
 
     const struct pmbus_driver_info *info;
 
     int max_attributes;
     int num_attributes;
     struct attribute_group group;
     const struct attribute_group **groups;
     struct dentry *debugfs;     /* debugfs device directory */
 
     struct pmbus_sensor *sensors;
 
     struct mutex update_lock;
 
     bool has_status_word;       /* device uses STATUS_WORD register */
     int (*read_status)(struct i2c_client *client, int page);
 
     s16 currpage;   /* current page, -1 for unknown/unset */
     s16 currphase;  /* current phase, 0xff for all, -1 for unknown/unset */
 
     int vout_low[PMBUS_PAGES];  /* voltage low margin */
     int vout_high[PMBUS_PAGES]; /* voltage high margin */
 };
 
 struct pmbus_debugfs_entry {
     struct i2c_client *client;
     u8 page;
     u8 reg;
 };
 
 static const int pmbus_fan_rpm_mask[] = {
     PB_FAN_1_RPM,
     PB_FAN_2_RPM,
     PB_FAN_1_RPM,
     PB_FAN_2_RPM,
 };
 
 static const int pmbus_fan_config_registers[] = {
     PMBUS_FAN_CONFIG_12,
     PMBUS_FAN_CONFIG_12,
     PMBUS_FAN_CONFIG_34,
     PMBUS_FAN_CONFIG_34
 };
 
 static const int pmbus_fan_command_registers[] = {
     PMBUS_FAN_COMMAND_1,
     PMBUS_FAN_COMMAND_2,
     PMBUS_FAN_COMMAND_3,
     PMBUS_FAN_COMMAND_4,
 };
 
 void pmbus_clear_cache(struct i2c_client *client)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
     struct pmbus_sensor *sensor;
 
     for (sensor = data->sensors; sensor; sensor = sensor->next)
         sensor->data = -ENODATA;
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_clear_cache, PMBUS);
 
 void pmbus_set_update(struct i2c_client *client, u8 reg, bool update)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
     struct pmbus_sensor *sensor;
 
     for (sensor = data->sensors; sensor; sensor = sensor->next)
         if (sensor->reg == reg)
             sensor->update = update;
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_set_update, PMBUS);
 
 int pmbus_set_page(struct i2c_client *client, int page, int phase)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
     int rv;
 
     if (page < 0)
         return 0;
 
     if (!(data->info->func[page] & PMBUS_PAGE_VIRTUAL) &&
         data->info->pages > 1 && page != data->currpage) {
         rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
         if (rv < 0)
             return rv;
 
         rv = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
         if (rv < 0)
             return rv;
 
         if (rv != page)
             return -EIO;
     }
     data->currpage = page;
 
     if (data->info->phases[page] && data->currphase != phase &&
         !(data->info->func[page] & PMBUS_PHASE_VIRTUAL)) {
         rv = i2c_smbus_write_byte_data(client, PMBUS_PHASE,
                            phase);
         if (rv)
             return rv;
     }
     data->currphase = phase;
 
     return 0;
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_set_page, PMBUS);
 
 int pmbus_write_byte(struct i2c_client *client, int page, u8 value)
 {
     int rv;
 
     rv = pmbus_set_page(client, page, 0xff);
     if (rv < 0)
         return rv;
 
     return i2c_smbus_write_byte(client, value);
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_write_byte, PMBUS);
 
 /*
  * _pmbus_write_byte() is similar to pmbus_write_byte(), but checks if
  * a device specific mapping function exists and calls it if necessary.
  */
 static int _pmbus_write_byte(struct i2c_client *client, int page, u8 value)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
     const struct pmbus_driver_info *info = data->info;
     int status;
 
     if (info->write_byte) {
         status = info->write_byte(client, page, value);
         if (status != -ENODATA)
             return status;
     }
     return pmbus_write_byte(client, page, value);
 }
 
 int pmbus_write_word_data(struct i2c_client *client, int page, u8 reg,
               u16 word)
 {
     int rv;
 
     rv = pmbus_set_page(client, page, 0xff);
     if (rv < 0)
         return rv;
 
     return i2c_smbus_write_word_data(client, reg, word);
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_write_word_data, PMBUS);
 
 
 static int pmbus_write_virt_reg(struct i2c_client *client, int page, int reg,
                 u16 word)
 {
     int bit;
     int id;
     int rv;
 
     switch (reg) {
     case PMBUS_VIRT_FAN_TARGET_1 ... PMBUS_VIRT_FAN_TARGET_4:
         id = reg - PMBUS_VIRT_FAN_TARGET_1;
         bit = pmbus_fan_rpm_mask[id];
         rv = pmbus_update_fan(client, page, id, bit, bit, word);
         break;
     default:
         rv = -ENXIO;
         break;
     }
 
     return rv;
 }
 
 /*
  * _pmbus_write_word_data() is similar to pmbus_write_word_data(), but checks if
  * a device specific mapping function exists and calls it if necessary.
  */
 static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg,
                   u16 word)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
     const struct pmbus_driver_info *info = data->info;
     int status;
 
     if (info->write_word_data) {
         status = info->write_word_data(client, page, reg, word);
         if (status != -ENODATA)
             return status;
     }
 
     if (reg >= PMBUS_VIRT_BASE)
         return pmbus_write_virt_reg(client, page, reg, word);
 
     return pmbus_write_word_data(client, page, reg, word);
 }
 
 /*
  * _pmbus_write_byte_data() is similar to pmbus_write_byte_data(), but checks if
  * a device specific mapping function exists and calls it if necessary.
  */
 static int _pmbus_write_byte_data(struct i2c_client *client, int page, int reg, u8 value)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
     const struct pmbus_driver_info *info = data->info;
     int status;
 
     if (info->write_byte_data) {
         status = info->write_byte_data(client, page, reg, value);
         if (status != -ENODATA)
             return status;
     }
     return pmbus_write_byte_data(client, page, reg, value);
 }
 
 /*
  * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
  * a device specific mapping function exists and calls it if necessary.
  */
 static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
     const struct pmbus_driver_info *info = data->info;
     int status;
 
     if (info->read_byte_data) {
         status = info->read_byte_data(client, page, reg);
         if (status != -ENODATA)
             return status;
     }
     return pmbus_read_byte_data(client, page, reg);
 }
 
 int pmbus_update_fan(struct i2c_client *client, int page, int id,
              u8 config, u8 mask, u16 command)
 {
     int from;
     int rv;
     u8 to;
 
     from = _pmbus_read_byte_data(client, page,
                     pmbus_fan_config_registers[id]);
     if (from < 0)
         return from;
 
     to = (from & ~mask) | (config & mask);
     if (to != from) {
         rv = _pmbus_write_byte_data(client, page,
                        pmbus_fan_config_registers[id], to);
         if (rv < 0)
             return rv;
     }
 
     return _pmbus_write_word_data(client, page,
                       pmbus_fan_command_registers[id], command);
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_update_fan, PMBUS);
 
 int pmbus_read_word_data(struct i2c_client *client, int page, int phase, u8 reg)
 {
     int rv;
 
     rv = pmbus_set_page(client, page, phase);
     if (rv < 0)
         return rv;
 
     return i2c_smbus_read_word_data(client, reg);
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_read_word_data, PMBUS);
 
 static int pmbus_read_virt_reg(struct i2c_client *client, int page, int reg)
 {
     int rv;
     int id;
 
     switch (reg) {
     case PMBUS_VIRT_FAN_TARGET_1 ... PMBUS_VIRT_FAN_TARGET_4:
         id = reg - PMBUS_VIRT_FAN_TARGET_1;
         rv = pmbus_get_fan_rate_device(client, page, id, rpm);
         break;
     default:
         rv = -ENXIO;
         break;
     }
 
     return rv;
 }
 
 /*
  * _pmbus_read_word_data() is similar to pmbus_read_word_data(), but checks if
  * a device specific mapping function exists and calls it if necessary.
  */
 static int _pmbus_read_word_data(struct i2c_client *client, int page,
                  int phase, int reg)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
     const struct pmbus_driver_info *info = data->info;
     int status;
 
     if (info->read_word_data) {
         status = info->read_word_data(client, page, phase, reg);
         if (status != -ENODATA)
             return status;
     }
 
     if (reg >= PMBUS_VIRT_BASE)
         return pmbus_read_virt_reg(client, page, reg);
 
     return pmbus_read_word_data(client, page, phase, reg);
 }
 
 /* Same as above, but without phase parameter, for use in check functions */
 static int __pmbus_read_word_data(struct i2c_client *client, int page, int reg)
 {
     return _pmbus_read_word_data(client, page, 0xff, reg);
 }
 
 int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg)
 {
     int rv;
 
     rv = pmbus_set_page(client, page, 0xff);
     if (rv < 0)
         return rv;
 
     return i2c_smbus_read_byte_data(client, reg);
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_read_byte_data, PMBUS);
 
 int pmbus_write_byte_data(struct i2c_client *client, int page, u8 reg, u8 value)
 {
     int rv;
 
     rv = pmbus_set_page(client, page, 0xff);
     if (rv < 0)
         return rv;
 
     return i2c_smbus_write_byte_data(client, reg, value);
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_write_byte_data, PMBUS);
 
 int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg,
                u8 mask, u8 value)
 {
     unsigned int tmp;
     int rv;
 
     rv = _pmbus_read_byte_data(client, page, reg);
     if (rv < 0)
         return rv;
 
     tmp = (rv & ~mask) | (value & mask);
 
     if (tmp != rv)
         rv = _pmbus_write_byte_data(client, page, reg, tmp);
 
     return rv;
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_update_byte_data, PMBUS);
 
 static int pmbus_read_block_data(struct i2c_client *client, int page, u8 reg,
                  char *data_buf)
 {
     int rv;
 
     rv = pmbus_set_page(client, page, 0xff);
     if (rv < 0)
         return rv;
 
     return i2c_smbus_read_block_data(client, reg, data_buf);
 }
 
 static struct pmbus_sensor *pmbus_find_sensor(struct pmbus_data *data, int page,
                           int reg)
 {
     struct pmbus_sensor *sensor;
 
     for (sensor = data->sensors; sensor; sensor = sensor->next) {
         if (sensor->page == page && sensor->reg == reg)
             return sensor;
     }
 
     return ERR_PTR(-EINVAL);
 }
 
 static int pmbus_get_fan_rate(struct i2c_client *client, int page, int id,
                   enum pmbus_fan_mode mode,
                   bool from_cache)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
     bool want_rpm, have_rpm;
     struct pmbus_sensor *s;
     int config;
     int reg;
 
     want_rpm = (mode == rpm);
 
     if (from_cache) {
         reg = want_rpm ? PMBUS_VIRT_FAN_TARGET_1 : PMBUS_VIRT_PWM_1;
         s = pmbus_find_sensor(data, page, reg + id);
         if (IS_ERR(s))
             return PTR_ERR(s);
 
         return s->data;
     }
 
     config = _pmbus_read_byte_data(client, page,
                       pmbus_fan_config_registers[id]);
     if (config < 0)
         return config;
 
     have_rpm = !!(config & pmbus_fan_rpm_mask[id]);
     if (want_rpm == have_rpm)
         return pmbus_read_word_data(client, page, 0xff,
                         pmbus_fan_command_registers[id]);
 
     /* Can't sensibly map between RPM and PWM, just return zero */
     return 0;
 }
 
 int pmbus_get_fan_rate_device(struct i2c_client *client, int page, int id,
                   enum pmbus_fan_mode mode)
 {
     return pmbus_get_fan_rate(client, page, id, mode, false);
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_get_fan_rate_device, PMBUS);
 
 int pmbus_get_fan_rate_cached(struct i2c_client *client, int page, int id,
                   enum pmbus_fan_mode mode)
 {
     return pmbus_get_fan_rate(client, page, id, mode, true);
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_get_fan_rate_cached, PMBUS);
 
 static void pmbus_clear_fault_page(struct i2c_client *client, int page)
 {
     _pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
 }
 
 void pmbus_clear_faults(struct i2c_client *client)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
     int i;
 
     for (i = 0; i < data->info->pages; i++)
         pmbus_clear_fault_page(client, i);
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_clear_faults, PMBUS);
 
 static int pmbus_check_status_cml(struct i2c_client *client)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
     int status, status2;
 
     status = data->read_status(client, -1);
     if (status < 0 || (status & PB_STATUS_CML)) {
         status2 = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
         if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
             return -EIO;
     }
     return 0;
 }
 
 static bool pmbus_check_register(struct i2c_client *client,
                  int (*func)(struct i2c_client *client,
                          int page, int reg),
                  int page, int reg)
 {
     int rv;
     struct pmbus_data *data = i2c_get_clientdata(client);
 
     rv = func(client, page, reg);
     if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
         rv = pmbus_check_status_cml(client);
     if (rv < 0 && (data->flags & PMBUS_READ_STATUS_AFTER_FAILED_CHECK))
         data->read_status(client, -1);
     pmbus_clear_fault_page(client, -1);
     return rv >= 0;
 }
 
 static bool pmbus_check_status_register(struct i2c_client *client, int page)
 {
     int status;
     struct pmbus_data *data = i2c_get_clientdata(client);
 
     status = data->read_status(client, page);
     if (status >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK) &&
         (status & PB_STATUS_CML)) {
         status = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
         if (status < 0 || (status & PB_CML_FAULT_INVALID_COMMAND))
             status = -EIO;
     }
 
     pmbus_clear_fault_page(client, -1);
     return status >= 0;
 }
 
 bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
 {
     return pmbus_check_register(client, _pmbus_read_byte_data, page, reg);
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_check_byte_register, PMBUS);
 
 bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
 {
     return pmbus_check_register(client, __pmbus_read_word_data, page, reg);
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_check_word_register, PMBUS);
 
 static bool __maybe_unused pmbus_check_block_register(struct i2c_client *client,
                               int page, int reg)
 {
     int rv;
     struct pmbus_data *data = i2c_get_clientdata(client);
     char data_buf[I2C_SMBUS_BLOCK_MAX + 2];
 
     rv = pmbus_read_block_data(client, page, reg, data_buf);
     if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
         rv = pmbus_check_status_cml(client);
     if (rv < 0 && (data->flags & PMBUS_READ_STATUS_AFTER_FAILED_CHECK))
         data->read_status(client, -1);
     pmbus_clear_fault_page(client, -1);
     return rv >= 0;
 }
 
 const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
 
     return data->info;
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_get_driver_info, PMBUS);
 
 static int pmbus_get_status(struct i2c_client *client, int page, int reg)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
     int status;
 
     switch (reg) {
     case PMBUS_STATUS_WORD:
         status = data->read_status(client, page);
         break;
     default:
         status = _pmbus_read_byte_data(client, page, reg);
         break;
     }
     if (status < 0)
         pmbus_clear_faults(client);
     return status;
 }
 
 static void pmbus_update_sensor_data(struct i2c_client *client, struct pmbus_sensor *sensor)
 {
     if (sensor->data < 0 || sensor->update)
         sensor->data = _pmbus_read_word_data(client, sensor->page,
                              sensor->phase, sensor->reg);
 }
 
 /*
  * Convert ieee754 sensor values to milli- or micro-units
  * depending on sensor type.
  *
  * ieee754 data format:
  *  bit 15:     sign
  *  bit 10..14: exponent
  *  bit 0..9:   mantissa
  * exponent=0:
  *  v=(−1)^signbit * 2^(−14) * 0.significantbits
  * exponent=1..30:
  *  v=(−1)^signbit * 2^(exponent - 15) * 1.significantbits
  * exponent=31:
  *  v=NaN
  *
  * Add the number mantissa bits into the calculations for simplicity.
  * To do that, add '10' to the exponent. By doing that, we can just add
  * 0x400 to normal values and get the expected result.
  */
 static long pmbus_reg2data_ieee754(struct pmbus_data *data,
                    struct pmbus_sensor *sensor)
 {
     int exponent;
     bool sign;
     long val;
 
     /* only support half precision for now */
     sign = sensor->data & 0x8000;
     exponent = (sensor->data >> 10) & 0x1f;
     val = sensor->data & 0x3ff;
 
     if (exponent == 0) {            /* subnormal */
         exponent = -(14 + 10);
     } else if (exponent ==  0x1f) {     /* NaN, convert to min/max */
         exponent = 0;
         val = 65504;
     } else {
         exponent -= (15 + 10);      /* normal */
         val |= 0x400;
     }
 
     /* scale result to milli-units for all sensors except fans */
     if (sensor->class != PSC_FAN)
         val = val * 1000L;
 
     /* scale result to micro-units for power sensors */
     if (sensor->class == PSC_POWER)
         val = val * 1000L;
 
     if (exponent >= 0)
         val <<= exponent;
     else
         val >>= -exponent;
 
     if (sign)
         val = -val;
 
     return val;
 }
 
 /*
  * Convert linear sensor values to milli- or micro-units
  * depending on sensor type.
  */
 static s64 pmbus_reg2data_linear(struct pmbus_data *data,
                  struct pmbus_sensor *sensor)
 {
     s16 exponent;
     s32 mantissa;
     s64 val;
 
     if (sensor->class == PSC_VOLTAGE_OUT) { /* LINEAR16 */
         exponent = data->exponent[sensor->page];
         mantissa = (u16) sensor->data;
     } else {                /* LINEAR11 */
         exponent = ((s16)sensor->data) >> 11;
         mantissa = ((s16)((sensor->data & 0x7ff) << 5)) >> 5;
     }
 
     val = mantissa;
 
     /* scale result to milli-units for all sensors except fans */
     if (sensor->class != PSC_FAN)
         val = val * 1000LL;
 
     /* scale result to micro-units for power sensors */
     if (sensor->class == PSC_POWER)
         val = val * 1000LL;
 
     if (exponent >= 0)
         val <<= exponent;
     else
         val >>= -exponent;
 
     return val;
 }
 
 /*
  * Convert direct sensor values to milli- or micro-units
  * depending on sensor type.
  */
 static s64 pmbus_reg2data_direct(struct pmbus_data *data,
                  struct pmbus_sensor *sensor)
 {
     s64 b, val = (s16)sensor->data;
     s32 m, R;
 
     m = data->info->m[sensor->class];
     b = data->info->b[sensor->class];
     R = data->info->R[sensor->class];
 
     if (m == 0)
         return 0;
 
     /* X = 1/m * (Y * 10^-R - b) */
     R = -R;
     /* scale result to milli-units for everything but fans */
     if (!(sensor->class == PSC_FAN || sensor->class == PSC_PWM)) {
         R += 3;
         b *= 1000;
     }
 
     /* scale result to micro-units for power sensors */
     if (sensor->class == PSC_POWER) {
         R += 3;
         b *= 1000;
     }
 
     while (R > 0) {
         val *= 10;
         R--;
     }
     while (R < 0) {
         val = div_s64(val + 5LL, 10L);  /* round closest */
         R++;
     }
 
     val = div_s64(val - b, m);
     return val;
 }
 
 /*
  * Convert VID sensor values to milli- or micro-units
  * depending on sensor type.
  */
 static s64 pmbus_reg2data_vid(struct pmbus_data *data,
                   struct pmbus_sensor *sensor)
 {
     long val = sensor->data;
     long rv = 0;
 
     switch (data->info->vrm_version[sensor->page]) {
     case vr11:
         if (val >= 0x02 && val <= 0xb2)
             rv = DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100);
         break;
     case vr12:
         if (val >= 0x01)
             rv = 250 + (val - 1) * 5;
         break;
     case vr13:
         if (val >= 0x01)
             rv = 500 + (val - 1) * 10;
         break;
     case imvp9:
         if (val >= 0x01)
             rv = 200 + (val - 1) * 10;
         break;
     case amd625mv:
         if (val >= 0x0 && val <= 0xd8)
             rv = DIV_ROUND_CLOSEST(155000 - val * 625, 100);
         break;
     }
     return rv;
 }
 
 static s64 pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
 {
     s64 val;
 
     if (!sensor->convert)
         return sensor->data;
 
     switch (data->info->format[sensor->class]) {
     case direct:
         val = pmbus_reg2data_direct(data, sensor);
         break;
     case vid:
         val = pmbus_reg2data_vid(data, sensor);
         break;
     case ieee754:
         val = pmbus_reg2data_ieee754(data, sensor);
         break;
     case linear:
     default:
         val = pmbus_reg2data_linear(data, sensor);
         break;
     }
     return val;
 }
 
 #define MAX_IEEE_MANTISSA   (0x7ff * 1000)
 #define MIN_IEEE_MANTISSA   (0x400 * 1000)
 
 static u16 pmbus_data2reg_ieee754(struct pmbus_data *data,
                   struct pmbus_sensor *sensor, long val)
 {
     u16 exponent = (15 + 10);
     long mantissa;
     u16 sign = 0;
 
     /* simple case */
     if (val == 0)
         return 0;
 
     if (val < 0) {
         sign = 0x8000;
         val = -val;
     }
 
     /* Power is in uW. Convert to mW before converting. */
     if (sensor->class == PSC_POWER)
         val = DIV_ROUND_CLOSEST(val, 1000L);
 
     /*
      * For simplicity, convert fan data to milli-units
      * before calculating the exponent.
      */
     if (sensor->class == PSC_FAN)
         val = val * 1000;
 
     /* Reduce large mantissa until it fits into 10 bit */
     while (val > MAX_IEEE_MANTISSA && exponent < 30) {
         exponent++;
         val >>= 1;
     }
     /*
      * Increase small mantissa to generate valid 'normal'
      * number
      */
     while (val < MIN_IEEE_MANTISSA && exponent > 1) {
         exponent--;
         val <<= 1;
     }
 
     /* Convert mantissa from milli-units to units */
     mantissa = DIV_ROUND_CLOSEST(val, 1000);
 
     /*
      * Ensure that the resulting number is within range.
      * Valid range is 0x400..0x7ff, where bit 10 reflects
      * the implied high bit in normalized ieee754 numbers.
      * Set the range to 0x400..0x7ff to reflect this.
      * The upper bit is then removed by the mask against
      * 0x3ff in the final assignment.
      */
     if (mantissa > 0x7ff)
         mantissa = 0x7ff;
     else if (mantissa < 0x400)
         mantissa = 0x400;
 
     /* Convert to sign, 5 bit exponent, 10 bit mantissa */
     return sign | (mantissa & 0x3ff) | ((exponent << 10) & 0x7c00);
 }
 
 #define MAX_LIN_MANTISSA    (1023 * 1000)
 #define MIN_LIN_MANTISSA    (511 * 1000)
 
 static u16 pmbus_data2reg_linear(struct pmbus_data *data,
                  struct pmbus_sensor *sensor, s64 val)
 {
     s16 exponent = 0, mantissa;
     bool negative = false;
 
     /* simple case */
     if (val == 0)
         return 0;
 
     if (sensor->class == PSC_VOLTAGE_OUT) {
         /* LINEAR16 does not support negative voltages */
         if (val < 0)
             return 0;
 
         /*
          * For a static exponents, we don't have a choice
          * but to adjust the value to it.
          */
         if (data->exponent[sensor->page] < 0)
             val <<= -data->exponent[sensor->page];
         else
             val >>= data->exponent[sensor->page];
         val = DIV_ROUND_CLOSEST_ULL(val, 1000);
         return clamp_val(val, 0, 0xffff);
     }
 
     if (val < 0) {
         negative = true;
         val = -val;
     }
 
     /* Power is in uW. Convert to mW before converting. */
     if (sensor->class == PSC_POWER)
         val = DIV_ROUND_CLOSEST_ULL(val, 1000);
 
     /*
      * For simplicity, convert fan data to milli-units
      * before calculating the exponent.
      */
     if (sensor->class == PSC_FAN)
         val = val * 1000LL;
 
     /* Reduce large mantissa until it fits into 10 bit */
     while (val >= MAX_LIN_MANTISSA && exponent < 15) {
         exponent++;
         val >>= 1;
     }
     /* Increase small mantissa to improve precision */
     while (val < MIN_LIN_MANTISSA && exponent > -15) {
         exponent--;
         val <<= 1;
     }
 
     /* Convert mantissa from milli-units to units */
     mantissa = clamp_val(DIV_ROUND_CLOSEST_ULL(val, 1000), 0, 0x3ff);
 
     /* restore sign */
     if (negative)
         mantissa = -mantissa;
 
     /* Convert to 5 bit exponent, 11 bit mantissa */
     return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
 }
 
 static u16 pmbus_data2reg_direct(struct pmbus_data *data,
                  struct pmbus_sensor *sensor, s64 val)
 {
     s64 b;
     s32 m, R;
 
     m = data->info->m[sensor->class];
     b = data->info->b[sensor->class];
     R = data->info->R[sensor->class];
 
     /* Power is in uW. Adjust R and b. */
     if (sensor->class == PSC_POWER) {
         R -= 3;
         b *= 1000;
     }
 
     /* Calculate Y = (m * X + b) * 10^R */
     if (!(sensor->class == PSC_FAN || sensor->class == PSC_PWM)) {
         R -= 3;     /* Adjust R and b for data in milli-units */
         b *= 1000;
     }
     val = val * m + b;
 
     while (R > 0) {
         val *= 10;
         R--;
     }
     while (R < 0) {
         val = div_s64(val + 5LL, 10L);  /* round closest */
         R++;
     }
 
     return (u16)clamp_val(val, S16_MIN, S16_MAX);
 }
 
 static u16 pmbus_data2reg_vid(struct pmbus_data *data,
                   struct pmbus_sensor *sensor, s64 val)
 {
     val = clamp_val(val, 500, 1600);
 
     return 2 + DIV_ROUND_CLOSEST_ULL((1600LL - val) * 100LL, 625);
 }
 
 static u16 pmbus_data2reg(struct pmbus_data *data,
               struct pmbus_sensor *sensor, s64 val)
 {
     u16 regval;
 
     if (!sensor->convert)
         return val;
 
     switch (data->info->format[sensor->class]) {
     case direct:
         regval = pmbus_data2reg_direct(data, sensor, val);
         break;
     case vid:
         regval = pmbus_data2reg_vid(data, sensor, val);
         break;
     case ieee754:
         regval = pmbus_data2reg_ieee754(data, sensor, val);
         break;
     case linear:
     default:
         regval = pmbus_data2reg_linear(data, sensor, val);
         break;
     }
     return regval;
 }
 
 /*
  * Return boolean calculated from converted data.
  * <index> defines a status register index and mask.
  * The mask is in the lower 8 bits, the register index is in bits 8..23.
  *
  * The associated pmbus_boolean structure contains optional pointers to two
  * sensor attributes. If specified, those attributes are compared against each
  * other to determine if a limit has been exceeded.
  *
  * If the sensor attribute pointers are NULL, the function returns true if
  * (status[reg] & mask) is true.
  *
  * If sensor attribute pointers are provided, a comparison against a specified
  * limit has to be performed to determine the boolean result.
  * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
  * sensor values referenced by sensor attribute pointers s1 and s2).
  *
  * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
  * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
  *
  * If a negative value is stored in any of the referenced registers, this value
  * reflects an error code which will be returned.
  */
 static int pmbus_get_boolean(struct i2c_client *client, struct pmbus_boolean *b,
                  int index)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
     struct pmbus_sensor *s1 = b->s1;
     struct pmbus_sensor *s2 = b->s2;
     u16 mask = pb_index_to_mask(index);
     u8 page = pb_index_to_page(index);
     u16 reg = pb_index_to_reg(index);
     int ret, status;
     u16 regval;
 
     mutex_lock(&data->update_lock);
     status = pmbus_get_status(client, page, reg);
     if (status < 0) {
         ret = status;
         goto unlock;
     }
 
     if (s1)
         pmbus_update_sensor_data(client, s1);
     if (s2)
         pmbus_update_sensor_data(client, s2);
 
     regval = status & mask;
     if (regval) {
         ret = _pmbus_write_byte_data(client, page, reg, regval);
         if (ret)
             goto unlock;
     }
     if (s1 && s2) {
         s64 v1, v2;
 
         if (s1->data < 0) {
             ret = s1->data;
             goto unlock;
         }
         if (s2->data < 0) {
             ret = s2->data;
             goto unlock;
         }
 
         v1 = pmbus_reg2data(data, s1);
         v2 = pmbus_reg2data(data, s2);
         ret = !!(regval && v1 >= v2);
     } else {
         ret = !!regval;
     }
 unlock:
     mutex_unlock(&data->update_lock);
     return ret;
 }
 
 static ssize_t pmbus_show_boolean(struct device *dev,
                   struct device_attribute *da, char *buf)
 {
     struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
     struct pmbus_boolean *boolean = to_pmbus_boolean(attr);
     struct i2c_client *client = to_i2c_client(dev->parent);
     int val;
 
     val = pmbus_get_boolean(client, boolean, attr->index);
     if (val < 0)
         return val;
     return sysfs_emit(buf, "%d\n", val);
 }
 
 static ssize_t pmbus_show_sensor(struct device *dev,
                  struct device_attribute *devattr, char *buf)
 {
     struct i2c_client *client = to_i2c_client(dev->parent);
     struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
     struct pmbus_data *data = i2c_get_clientdata(client);
     ssize_t ret;
 
     mutex_lock(&data->update_lock);
     pmbus_update_sensor_data(client, sensor);
     if (sensor->data < 0)
         ret = sensor->data;
     else
         ret = sysfs_emit(buf, "%lld\n", pmbus_reg2data(data, sensor));
     mutex_unlock(&data->update_lock);
     return ret;
 }
 
 static ssize_t pmbus_set_sensor(struct device *dev,
                 struct device_attribute *devattr,
                 const char *buf, size_t count)
 {
     struct i2c_client *client = to_i2c_client(dev->parent);
     struct pmbus_data *data = i2c_get_clientdata(client);
     struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
     ssize_t rv = count;
     s64 val;
     int ret;
     u16 regval;
 
     if (kstrtos64(buf, 10, &val) < 0)
         return -EINVAL;
 
     mutex_lock(&data->update_lock);
     regval = pmbus_data2reg(data, sensor, val);
     ret = _pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
     if (ret < 0)
         rv = ret;
     else
         sensor->data = -ENODATA;
     mutex_unlock(&data->update_lock);
     return rv;
 }
 
 static ssize_t pmbus_show_label(struct device *dev,
                 struct device_attribute *da, char *buf)
 {
     struct pmbus_label *label = to_pmbus_label(da);
 
     return sysfs_emit(buf, "%s\n", label->label);
 }
 
 static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr)
 {
     if (data->num_attributes >= data->max_attributes - 1) {
         int new_max_attrs = data->max_attributes + PMBUS_ATTR_ALLOC_SIZE;
         void *new_attrs = devm_krealloc(data->dev, data->group.attrs,
                         new_max_attrs * sizeof(void *),
                         GFP_KERNEL);
         if (!new_attrs)
             return -ENOMEM;
         data->group.attrs = new_attrs;
         data->max_attributes = new_max_attrs;
     }
 
     data->group.attrs[data->num_attributes++] = attr;
     data->group.attrs[data->num_attributes] = NULL;
     return 0;
 }
 
 static void pmbus_dev_attr_init(struct device_attribute *dev_attr,
                 const char *name,
                 umode_t mode,
                 ssize_t (*show)(struct device *dev,
                         struct device_attribute *attr,
                         char *buf),
                 ssize_t (*store)(struct device *dev,
                          struct device_attribute *attr,
                          const char *buf, size_t count))
 {
     sysfs_attr_init(&dev_attr->attr);
     dev_attr->attr.name = name;
     dev_attr->attr.mode = mode;
     dev_attr->show = show;
     dev_attr->store = store;
 }
 
 static void pmbus_attr_init(struct sensor_device_attribute *a,
                 const char *name,
                 umode_t mode,
                 ssize_t (*show)(struct device *dev,
                         struct device_attribute *attr,
                         char *buf),
                 ssize_t (*store)(struct device *dev,
                          struct device_attribute *attr,
                          const char *buf, size_t count),
                 int idx)
 {
     pmbus_dev_attr_init(&a->dev_attr, name, mode, show, store);
     a->index = idx;
 }
 
 static int pmbus_add_boolean(struct pmbus_data *data,
                  const char *name, const char *type, int seq,
                  struct pmbus_sensor *s1,
                  struct pmbus_sensor *s2,
                  u8 page, u16 reg, u16 mask)
 {
     struct pmbus_boolean *boolean;
     struct sensor_device_attribute *a;
 
     if (WARN((s1 && !s2) || (!s1 && s2), "Bad s1/s2 parameters\n"))
         return -EINVAL;
 
     boolean = devm_kzalloc(data->dev, sizeof(*boolean), GFP_KERNEL);
     if (!boolean)
         return -ENOMEM;
 
     a = &boolean->attribute;
 
     snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
          name, seq, type);
     boolean->s1 = s1;
     boolean->s2 = s2;
     pmbus_attr_init(a, boolean->name, 0444, pmbus_show_boolean, NULL,
             pb_reg_to_index(page, reg, mask));
 
     return pmbus_add_attribute(data, &a->dev_attr.attr);
 }
 
 /* of thermal for pmbus temperature sensors */
 struct pmbus_thermal_data {
     struct pmbus_data *pmbus_data;
     struct pmbus_sensor *sensor;
 };
 
 static int pmbus_thermal_get_temp(void *data, int *temp)
 {
     struct pmbus_thermal_data *tdata = data;
     struct pmbus_sensor *sensor = tdata->sensor;
     struct pmbus_data *pmbus_data = tdata->pmbus_data;
     struct i2c_client *client = to_i2c_client(pmbus_data->dev);
     struct device *dev = pmbus_data->hwmon_dev;
     int ret = 0;
 
     if (!dev) {
         /* May not even get to hwmon yet */
         *temp = 0;
         return 0;
     }
 
     mutex_lock(&pmbus_data->update_lock);
     pmbus_update_sensor_data(client, sensor);
     if (sensor->data < 0)
         ret = sensor->data;
     else
         *temp = (int)pmbus_reg2data(pmbus_data, sensor);
     mutex_unlock(&pmbus_data->update_lock);
 
     return ret;
 }
 
 static const struct thermal_zone_of_device_ops pmbus_thermal_ops = {
     .get_temp = pmbus_thermal_get_temp,
 };
 
 static int pmbus_thermal_add_sensor(struct pmbus_data *pmbus_data,
                     struct pmbus_sensor *sensor, int index)
 {
     struct device *dev = pmbus_data->dev;
     struct pmbus_thermal_data *tdata;
     struct thermal_zone_device *tzd;
 
     tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
     if (!tdata)
         return -ENOMEM;
 
     tdata->sensor = sensor;
     tdata->pmbus_data = pmbus_data;
 
     tzd = devm_thermal_zone_of_sensor_register(dev, index, tdata,
                            &pmbus_thermal_ops);
     /*
      * If CONFIG_THERMAL_OF is disabled, this returns -ENODEV,
      * so ignore that error but forward any other error.
      */
     if (IS_ERR(tzd) && (PTR_ERR(tzd) != -ENODEV))
         return PTR_ERR(tzd);
 
     return 0;
 }
 
 static struct pmbus_sensor *pmbus_add_sensor(struct pmbus_data *data,
                          const char *name, const char *type,
                          int seq, int page, int phase,
                          int reg,
                          enum pmbus_sensor_classes class,
                          bool update, bool readonly,
                          bool convert)
 {
     struct pmbus_sensor *sensor;
     struct device_attribute *a;
 
     sensor = devm_kzalloc(data->dev, sizeof(*sensor), GFP_KERNEL);
     if (!sensor)
         return NULL;
     a = &sensor->attribute;
 
     if (type)
         snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
              name, seq, type);
     else
         snprintf(sensor->name, sizeof(sensor->name), "%s%d",
              name, seq);
 
     if (data->flags & PMBUS_WRITE_PROTECTED)
         readonly = true;
 
     sensor->page = page;
     sensor->phase = phase;
     sensor->reg = reg;
     sensor->class = class;
     sensor->update = update;
     sensor->convert = convert;
     sensor->data = -ENODATA;
     pmbus_dev_attr_init(a, sensor->name,
                 readonly ? 0444 : 0644,
                 pmbus_show_sensor, pmbus_set_sensor);
 
     if (pmbus_add_attribute(data, &a->attr))
         return NULL;
 
     sensor->next = data->sensors;
     data->sensors = sensor;
 
     /* temperature sensors with _input values are registered with thermal */
     if (class == PSC_TEMPERATURE && strcmp(type, "input") == 0)
         pmbus_thermal_add_sensor(data, sensor, seq);
 
     return sensor;
 }
 
 static int pmbus_add_label(struct pmbus_data *data,
                const char *name, int seq,
                const char *lstring, int index, int phase)
 {
     struct pmbus_label *label;
     struct device_attribute *a;
 
     label = devm_kzalloc(data->dev, sizeof(*label), GFP_KERNEL);
     if (!label)
         return -ENOMEM;
 
     a = &label->attribute;
 
     snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
     if (!index) {
         if (phase == 0xff)
             strncpy(label->label, lstring,
                 sizeof(label->label) - 1);
         else
             snprintf(label->label, sizeof(label->label), "%s.%d",
                  lstring, phase);
     } else {
         if (phase == 0xff)
             snprintf(label->label, sizeof(label->label), "%s%d",
                  lstring, index);
         else
             snprintf(label->label, sizeof(label->label), "%s%d.%d",
                  lstring, index, phase);
     }
 
     pmbus_dev_attr_init(a, label->name, 0444, pmbus_show_label, NULL);
     return pmbus_add_attribute(data, &a->attr);
 }
 
 /*
  * Search for attributes. Allocate sensors, booleans, and labels as needed.
  */
 
 /*
  * The pmbus_limit_attr structure describes a single limit attribute
  * and its associated alarm attribute.
  */
 struct pmbus_limit_attr {
     u16 reg;        /* Limit register */
     u16 sbit;       /* Alarm attribute status bit */
     bool update;        /* True if register needs updates */
     bool low;       /* True if low limit; for limits with compare
                    functions only */
     const char *attr;   /* Attribute name */
     const char *alarm;  /* Alarm attribute name */
 };
 
 /*
  * The pmbus_sensor_attr structure describes one sensor attribute. This
  * description includes a reference to the associated limit attributes.
  */
 struct pmbus_sensor_attr {
     u16 reg;            /* sensor register */
     u16 gbit;           /* generic status bit */
     u8 nlimit;          /* # of limit registers */
     enum pmbus_sensor_classes class;/* sensor class */
     const char *label;      /* sensor label */
     bool paged;         /* true if paged sensor */
     bool update;            /* true if update needed */
     bool compare;           /* true if compare function needed */
     u32 func;           /* sensor mask */
     u32 sfunc;          /* sensor status mask */
     int sreg;           /* status register */
     const struct pmbus_limit_attr *limit;/* limit registers */
 };
 
 /*
  * Add a set of limit attributes and, if supported, the associated
  * alarm attributes.
  * returns 0 if no alarm register found, 1 if an alarm register was found,
  * < 0 on errors.
  */
 static int pmbus_add_limit_attrs(struct i2c_client *client,
                  struct pmbus_data *data,
                  const struct pmbus_driver_info *info,
                  const char *name, int index, int page,
                  struct pmbus_sensor *base,
                  const struct pmbus_sensor_attr *attr)
 {
     const struct pmbus_limit_attr *l = attr->limit;
     int nlimit = attr->nlimit;
     int have_alarm = 0;
     int i, ret;
     struct pmbus_sensor *curr;
 
     for (i = 0; i < nlimit; i++) {
         if (pmbus_check_word_register(client, page, l->reg)) {
             curr = pmbus_add_sensor(data, name, l->attr, index,
                         page, 0xff, l->reg, attr->class,
                         attr->update || l->update,
                         false, true);
             if (!curr)
                 return -ENOMEM;
             if (l->sbit && (info->func[page] & attr->sfunc)) {
                 ret = pmbus_add_boolean(data, name,
                     l->alarm, index,
                     attr->compare ?  l->low ? curr : base
                               : NULL,
                     attr->compare ? l->low ? base : curr
                               : NULL,
                     page, attr->sreg, l->sbit);
                 if (ret)
                     return ret;
                 have_alarm = 1;
             }
         }
         l++;
     }
     return have_alarm;
 }
 
 static int pmbus_add_sensor_attrs_one(struct i2c_client *client,
                       struct pmbus_data *data,
                       const struct pmbus_driver_info *info,
                       const char *name,
                       int index, int page, int phase,
                       const struct pmbus_sensor_attr *attr,
                       bool paged)
 {
     struct pmbus_sensor *base;
     bool upper = !!(attr->gbit & 0xff00);   /* need to check STATUS_WORD */
     int ret;
 
     if (attr->label) {
         ret = pmbus_add_label(data, name, index, attr->label,
                       paged ? page + 1 : 0, phase);
         if (ret)
             return ret;
     }
     base = pmbus_add_sensor(data, name, "input", index, page, phase,
                 attr->reg, attr->class, true, true, true);
     if (!base)
         return -ENOMEM;
     /* No limit and alarm attributes for phase specific sensors */
     if (attr->sfunc && phase == 0xff) {
         ret = pmbus_add_limit_attrs(client, data, info, name,
                         index, page, base, attr);
         if (ret < 0)
             return ret;
         /*
          * Add generic alarm attribute only if there are no individual
          * alarm attributes, if there is a global alarm bit, and if
          * the generic status register (word or byte, depending on
          * which global bit is set) for this page is accessible.
          */
         if (!ret && attr->gbit &&
             (!upper || data->has_status_word) &&
             pmbus_check_status_register(client, page)) {
             ret = pmbus_add_boolean(data, name, "alarm", index,
                         NULL, NULL,
                         page, PMBUS_STATUS_WORD,
                         attr->gbit);
             if (ret)
                 return ret;
         }
     }
     return 0;
 }
 
 static bool pmbus_sensor_is_paged(const struct pmbus_driver_info *info,
                   const struct pmbus_sensor_attr *attr)
 {
     int p;
 
     if (attr->paged)
         return true;
 
     /*
      * Some attributes may be present on more than one page despite
      * not being marked with the paged attribute. If that is the case,
      * then treat the sensor as being paged and add the page suffix to the
      * attribute name.
      * We don't just add the paged attribute to all such attributes, in
      * order to maintain the un-suffixed labels in the case where the
      * attribute is only on page 0.
      */
     for (p = 1; p < info->pages; p++) {
         if (info->func[p] & attr->func)
             return true;
     }
     return false;
 }
 
 static int pmbus_add_sensor_attrs(struct i2c_client *client,
                   struct pmbus_data *data,
                   const char *name,
                   const struct pmbus_sensor_attr *attrs,
                   int nattrs)
 {
     const struct pmbus_driver_info *info = data->info;
     int index, i;
     int ret;
 
     index = 1;
     for (i = 0; i < nattrs; i++) {
         int page, pages;
         bool paged = pmbus_sensor_is_paged(info, attrs);
 
         pages = paged ? info->pages : 1;
         for (page = 0; page < pages; page++) {
             if (info->func[page] & attrs->func) {
                 ret = pmbus_add_sensor_attrs_one(client, data, info,
                                  name, index, page,
                                  0xff, attrs, paged);
                 if (ret)
                     return ret;
                 index++;
             }
             if (info->phases[page]) {
                 int phase;
 
                 for (phase = 0; phase < info->phases[page];
                      phase++) {
                     if (!(info->pfunc[phase] & attrs->func))
                         continue;
                     ret = pmbus_add_sensor_attrs_one(client,
                         data, info, name, index, page,
                         phase, attrs, paged);
                     if (ret)
                         return ret;
                     index++;
                 }
             }
         }
         attrs++;
     }
     return 0;
 }
 
 static const struct pmbus_limit_attr vin_limit_attrs[] = {
     {
         .reg = PMBUS_VIN_UV_WARN_LIMIT,
         .attr = "min",
         .alarm = "min_alarm",
         .sbit = PB_VOLTAGE_UV_WARNING,
     }, {
         .reg = PMBUS_VIN_UV_FAULT_LIMIT,
         .attr = "lcrit",
         .alarm = "lcrit_alarm",
         .sbit = PB_VOLTAGE_UV_FAULT | PB_VOLTAGE_VIN_OFF,
     }, {
         .reg = PMBUS_VIN_OV_WARN_LIMIT,
         .attr = "max",
         .alarm = "max_alarm",
         .sbit = PB_VOLTAGE_OV_WARNING,
     }, {
         .reg = PMBUS_VIN_OV_FAULT_LIMIT,
         .attr = "crit",
         .alarm = "crit_alarm",
         .sbit = PB_VOLTAGE_OV_FAULT,
     }, {
         .reg = PMBUS_VIRT_READ_VIN_AVG,
         .update = true,
         .attr = "average",
     }, {
         .reg = PMBUS_VIRT_READ_VIN_MIN,
         .update = true,
         .attr = "lowest",
     }, {
         .reg = PMBUS_VIRT_READ_VIN_MAX,
         .update = true,
         .attr = "highest",
     }, {
         .reg = PMBUS_VIRT_RESET_VIN_HISTORY,
         .attr = "reset_history",
     }, {
         .reg = PMBUS_MFR_VIN_MIN,
         .attr = "rated_min",
     }, {
         .reg = PMBUS_MFR_VIN_MAX,
         .attr = "rated_max",
     },
 };
 
 static const struct pmbus_limit_attr vmon_limit_attrs[] = {
     {
         .reg = PMBUS_VIRT_VMON_UV_WARN_LIMIT,
         .attr = "min",
         .alarm = "min_alarm",
         .sbit = PB_VOLTAGE_UV_WARNING,
     }, {
         .reg = PMBUS_VIRT_VMON_UV_FAULT_LIMIT,
         .attr = "lcrit",
         .alarm = "lcrit_alarm",
         .sbit = PB_VOLTAGE_UV_FAULT,
     }, {
         .reg = PMBUS_VIRT_VMON_OV_WARN_LIMIT,
         .attr = "max",
         .alarm = "max_alarm",
         .sbit = PB_VOLTAGE_OV_WARNING,
     }, {
         .reg = PMBUS_VIRT_VMON_OV_FAULT_LIMIT,
         .attr = "crit",
         .alarm = "crit_alarm",
         .sbit = PB_VOLTAGE_OV_FAULT,
     }
 };
 
 static const struct pmbus_limit_attr vout_limit_attrs[] = {
     {
         .reg = PMBUS_VOUT_UV_WARN_LIMIT,
         .attr = "min",
         .alarm = "min_alarm",
         .sbit = PB_VOLTAGE_UV_WARNING,
     }, {
         .reg = PMBUS_VOUT_UV_FAULT_LIMIT,
         .attr = "lcrit",
         .alarm = "lcrit_alarm",
         .sbit = PB_VOLTAGE_UV_FAULT,
     }, {
         .reg = PMBUS_VOUT_OV_WARN_LIMIT,
         .attr = "max",
         .alarm = "max_alarm",
         .sbit = PB_VOLTAGE_OV_WARNING,
     }, {
         .reg = PMBUS_VOUT_OV_FAULT_LIMIT,
         .attr = "crit",
         .alarm = "crit_alarm",
         .sbit = PB_VOLTAGE_OV_FAULT,
     }, {
         .reg = PMBUS_VIRT_READ_VOUT_AVG,
         .update = true,
         .attr = "average",
     }, {
         .reg = PMBUS_VIRT_READ_VOUT_MIN,
         .update = true,
         .attr = "lowest",
     }, {
         .reg = PMBUS_VIRT_READ_VOUT_MAX,
         .update = true,
         .attr = "highest",
     }, {
         .reg = PMBUS_VIRT_RESET_VOUT_HISTORY,
         .attr = "reset_history",
     }, {
         .reg = PMBUS_MFR_VOUT_MIN,
         .attr = "rated_min",
     }, {
         .reg = PMBUS_MFR_VOUT_MAX,
         .attr = "rated_max",
     },
 };
 
 static const struct pmbus_sensor_attr voltage_attributes[] = {
     {
         .reg = PMBUS_READ_VIN,
         .class = PSC_VOLTAGE_IN,
         .label = "vin",
         .func = PMBUS_HAVE_VIN,
         .sfunc = PMBUS_HAVE_STATUS_INPUT,
         .sreg = PMBUS_STATUS_INPUT,
         .gbit = PB_STATUS_VIN_UV,
         .limit = vin_limit_attrs,
         .nlimit = ARRAY_SIZE(vin_limit_attrs),
     }, {
         .reg = PMBUS_VIRT_READ_VMON,
         .class = PSC_VOLTAGE_IN,
         .label = "vmon",
         .func = PMBUS_HAVE_VMON,
         .sfunc = PMBUS_HAVE_STATUS_VMON,
         .sreg = PMBUS_VIRT_STATUS_VMON,
         .limit = vmon_limit_attrs,
         .nlimit = ARRAY_SIZE(vmon_limit_attrs),
     }, {
         .reg = PMBUS_READ_VCAP,
         .class = PSC_VOLTAGE_IN,
         .label = "vcap",
         .func = PMBUS_HAVE_VCAP,
     }, {
         .reg = PMBUS_READ_VOUT,
         .class = PSC_VOLTAGE_OUT,
         .label = "vout",
         .paged = true,
         .func = PMBUS_HAVE_VOUT,
         .sfunc = PMBUS_HAVE_STATUS_VOUT,
         .sreg = PMBUS_STATUS_VOUT,
         .gbit = PB_STATUS_VOUT_OV,
         .limit = vout_limit_attrs,
         .nlimit = ARRAY_SIZE(vout_limit_attrs),
     }
 };
 
 /* Current attributes */
 
 static const struct pmbus_limit_attr iin_limit_attrs[] = {
     {
         .reg = PMBUS_IIN_OC_WARN_LIMIT,
         .attr = "max",
         .alarm = "max_alarm",
         .sbit = PB_IIN_OC_WARNING,
     }, {
         .reg = PMBUS_IIN_OC_FAULT_LIMIT,
         .attr = "crit",
         .alarm = "crit_alarm",
         .sbit = PB_IIN_OC_FAULT,
     }, {
         .reg = PMBUS_VIRT_READ_IIN_AVG,
         .update = true,
         .attr = "average",
     }, {
         .reg = PMBUS_VIRT_READ_IIN_MIN,
         .update = true,
         .attr = "lowest",
     }, {
         .reg = PMBUS_VIRT_READ_IIN_MAX,
         .update = true,
         .attr = "highest",
     }, {
         .reg = PMBUS_VIRT_RESET_IIN_HISTORY,
         .attr = "reset_history",
     }, {
         .reg = PMBUS_MFR_IIN_MAX,
         .attr = "rated_max",
     },
 };
 
 static const struct pmbus_limit_attr iout_limit_attrs[] = {
     {
         .reg = PMBUS_IOUT_OC_WARN_LIMIT,
         .attr = "max",
         .alarm = "max_alarm",
         .sbit = PB_IOUT_OC_WARNING,
     }, {
         .reg = PMBUS_IOUT_UC_FAULT_LIMIT,
         .attr = "lcrit",
         .alarm = "lcrit_alarm",
         .sbit = PB_IOUT_UC_FAULT,
     }, {
         .reg = PMBUS_IOUT_OC_FAULT_LIMIT,
         .attr = "crit",
         .alarm = "crit_alarm",
         .sbit = PB_IOUT_OC_FAULT,
     }, {
         .reg = PMBUS_VIRT_READ_IOUT_AVG,
         .update = true,
         .attr = "average",
     }, {
         .reg = PMBUS_VIRT_READ_IOUT_MIN,
         .update = true,
         .attr = "lowest",
     }, {
         .reg = PMBUS_VIRT_READ_IOUT_MAX,
         .update = true,
         .attr = "highest",
     }, {
         .reg = PMBUS_VIRT_RESET_IOUT_HISTORY,
         .attr = "reset_history",
     }, {
         .reg = PMBUS_MFR_IOUT_MAX,
         .attr = "rated_max",
     },
 };
 
 static const struct pmbus_sensor_attr current_attributes[] = {
     {
         .reg = PMBUS_READ_IIN,
         .class = PSC_CURRENT_IN,
         .label = "iin",
         .func = PMBUS_HAVE_IIN,
         .sfunc = PMBUS_HAVE_STATUS_INPUT,
         .sreg = PMBUS_STATUS_INPUT,
         .gbit = PB_STATUS_INPUT,
         .limit = iin_limit_attrs,
         .nlimit = ARRAY_SIZE(iin_limit_attrs),
     }, {
         .reg = PMBUS_READ_IOUT,
         .class = PSC_CURRENT_OUT,
         .label = "iout",
         .paged = true,
         .func = PMBUS_HAVE_IOUT,
         .sfunc = PMBUS_HAVE_STATUS_IOUT,
         .sreg = PMBUS_STATUS_IOUT,
         .gbit = PB_STATUS_IOUT_OC,
         .limit = iout_limit_attrs,
         .nlimit = ARRAY_SIZE(iout_limit_attrs),
     }
 };
 
 /* Power attributes */
 
 static const struct pmbus_limit_attr pin_limit_attrs[] = {
     {
         .reg = PMBUS_PIN_OP_WARN_LIMIT,
         .attr = "max",
         .alarm = "alarm",
         .sbit = PB_PIN_OP_WARNING,
     }, {
         .reg = PMBUS_VIRT_READ_PIN_AVG,
         .update = true,
         .attr = "average",
     }, {
         .reg = PMBUS_VIRT_READ_PIN_MIN,
         .update = true,
         .attr = "input_lowest",
     }, {
         .reg = PMBUS_VIRT_READ_PIN_MAX,
         .update = true,
         .attr = "input_highest",
     }, {
         .reg = PMBUS_VIRT_RESET_PIN_HISTORY,
         .attr = "reset_history",
     }, {
         .reg = PMBUS_MFR_PIN_MAX,
         .attr = "rated_max",
     },
 };
 
 static const struct pmbus_limit_attr pout_limit_attrs[] = {
     {
         .reg = PMBUS_POUT_MAX,
         .attr = "cap",
         .alarm = "cap_alarm",
         .sbit = PB_POWER_LIMITING,
     }, {
         .reg = PMBUS_POUT_OP_WARN_LIMIT,
         .attr = "max",
         .alarm = "max_alarm",
         .sbit = PB_POUT_OP_WARNING,
     }, {
         .reg = PMBUS_POUT_OP_FAULT_LIMIT,
         .attr = "crit",
         .alarm = "crit_alarm",
         .sbit = PB_POUT_OP_FAULT,
     }, {
         .reg = PMBUS_VIRT_READ_POUT_AVG,
         .update = true,
         .attr = "average",
     }, {
         .reg = PMBUS_VIRT_READ_POUT_MIN,
         .update = true,
         .attr = "input_lowest",
     }, {
         .reg = PMBUS_VIRT_READ_POUT_MAX,
         .update = true,
         .attr = "input_highest",
     }, {
         .reg = PMBUS_VIRT_RESET_POUT_HISTORY,
         .attr = "reset_history",
     }, {
         .reg = PMBUS_MFR_POUT_MAX,
         .attr = "rated_max",
     },
 };
 
 static const struct pmbus_sensor_attr power_attributes[] = {
     {
         .reg = PMBUS_READ_PIN,
         .class = PSC_POWER,
         .label = "pin",
         .func = PMBUS_HAVE_PIN,
         .sfunc = PMBUS_HAVE_STATUS_INPUT,
         .sreg = PMBUS_STATUS_INPUT,
         .gbit = PB_STATUS_INPUT,
         .limit = pin_limit_attrs,
         .nlimit = ARRAY_SIZE(pin_limit_attrs),
     }, {
         .reg = PMBUS_READ_POUT,
         .class = PSC_POWER,
         .label = "pout",
         .paged = true,
         .func = PMBUS_HAVE_POUT,
         .sfunc = PMBUS_HAVE_STATUS_IOUT,
         .sreg = PMBUS_STATUS_IOUT,
         .limit = pout_limit_attrs,
         .nlimit = ARRAY_SIZE(pout_limit_attrs),
     }
 };
 
 /* Temperature atributes */
 
 static const struct pmbus_limit_attr temp_limit_attrs[] = {
     {
         .reg = PMBUS_UT_WARN_LIMIT,
         .low = true,
         .attr = "min",
         .alarm = "min_alarm",
         .sbit = PB_TEMP_UT_WARNING,
     }, {
         .reg = PMBUS_UT_FAULT_LIMIT,
         .low = true,
         .attr = "lcrit",
         .alarm = "lcrit_alarm",
         .sbit = PB_TEMP_UT_FAULT,
     }, {
         .reg = PMBUS_OT_WARN_LIMIT,
         .attr = "max",
         .alarm = "max_alarm",
         .sbit = PB_TEMP_OT_WARNING,
     }, {
         .reg = PMBUS_OT_FAULT_LIMIT,
         .attr = "crit",
         .alarm = "crit_alarm",
         .sbit = PB_TEMP_OT_FAULT,
     }, {
         .reg = PMBUS_VIRT_READ_TEMP_MIN,
         .attr = "lowest",
     }, {
         .reg = PMBUS_VIRT_READ_TEMP_AVG,
         .attr = "average",
     }, {
         .reg = PMBUS_VIRT_READ_TEMP_MAX,
         .attr = "highest",
     }, {
         .reg = PMBUS_VIRT_RESET_TEMP_HISTORY,
         .attr = "reset_history",
     }, {
         .reg = PMBUS_MFR_MAX_TEMP_1,
         .attr = "rated_max",
     },
 };
 
 static const struct pmbus_limit_attr temp_limit_attrs2[] = {
     {
         .reg = PMBUS_UT_WARN_LIMIT,
         .low = true,
         .attr = "min",
         .alarm = "min_alarm",
         .sbit = PB_TEMP_UT_WARNING,
     }, {
         .reg = PMBUS_UT_FAULT_LIMIT,
         .low = true,
         .attr = "lcrit",
         .alarm = "lcrit_alarm",
         .sbit = PB_TEMP_UT_FAULT,
     }, {
         .reg = PMBUS_OT_WARN_LIMIT,
         .attr = "max",
         .alarm = "max_alarm",
         .sbit = PB_TEMP_OT_WARNING,
     }, {
         .reg = PMBUS_OT_FAULT_LIMIT,
         .attr = "crit",
         .alarm = "crit_alarm",
         .sbit = PB_TEMP_OT_FAULT,
     }, {
         .reg = PMBUS_VIRT_READ_TEMP2_MIN,
         .attr = "lowest",
     }, {
         .reg = PMBUS_VIRT_READ_TEMP2_AVG,
         .attr = "average",
     }, {
         .reg = PMBUS_VIRT_READ_TEMP2_MAX,
         .attr = "highest",
     }, {
         .reg = PMBUS_VIRT_RESET_TEMP2_HISTORY,
         .attr = "reset_history",
     }, {
         .reg = PMBUS_MFR_MAX_TEMP_2,
         .attr = "rated_max",
     },
 };
 
 static const struct pmbus_limit_attr temp_limit_attrs3[] = {
     {
         .reg = PMBUS_UT_WARN_LIMIT,
         .low = true,
         .attr = "min",
         .alarm = "min_alarm",
         .sbit = PB_TEMP_UT_WARNING,
     }, {
         .reg = PMBUS_UT_FAULT_LIMIT,
         .low = true,
         .attr = "lcrit",
         .alarm = "lcrit_alarm",
         .sbit = PB_TEMP_UT_FAULT,
     }, {
         .reg = PMBUS_OT_WARN_LIMIT,
         .attr = "max",
         .alarm = "max_alarm",
         .sbit = PB_TEMP_OT_WARNING,
     }, {
         .reg = PMBUS_OT_FAULT_LIMIT,
         .attr = "crit",
         .alarm = "crit_alarm",
         .sbit = PB_TEMP_OT_FAULT,
     }, {
         .reg = PMBUS_MFR_MAX_TEMP_3,
         .attr = "rated_max",
     },
 };
 
 static const struct pmbus_sensor_attr temp_attributes[] = {
     {
         .reg = PMBUS_READ_TEMPERATURE_1,
         .class = PSC_TEMPERATURE,
         .paged = true,
         .update = true,
         .compare = true,
         .func = PMBUS_HAVE_TEMP,
         .sfunc = PMBUS_HAVE_STATUS_TEMP,
         .sreg = PMBUS_STATUS_TEMPERATURE,
         .gbit = PB_STATUS_TEMPERATURE,
         .limit = temp_limit_attrs,
         .nlimit = ARRAY_SIZE(temp_limit_attrs),
     }, {
         .reg = PMBUS_READ_TEMPERATURE_2,
         .class = PSC_TEMPERATURE,
         .paged = true,
         .update = true,
         .compare = true,
         .func = PMBUS_HAVE_TEMP2,
         .sfunc = PMBUS_HAVE_STATUS_TEMP,
         .sreg = PMBUS_STATUS_TEMPERATURE,
         .gbit = PB_STATUS_TEMPERATURE,
         .limit = temp_limit_attrs2,
         .nlimit = ARRAY_SIZE(temp_limit_attrs2),
     }, {
         .reg = PMBUS_READ_TEMPERATURE_3,
         .class = PSC_TEMPERATURE,
         .paged = true,
         .update = true,
         .compare = true,
         .func = PMBUS_HAVE_TEMP3,
         .sfunc = PMBUS_HAVE_STATUS_TEMP,
         .sreg = PMBUS_STATUS_TEMPERATURE,
         .gbit = PB_STATUS_TEMPERATURE,
         .limit = temp_limit_attrs3,
         .nlimit = ARRAY_SIZE(temp_limit_attrs3),
     }
 };
 
 static const int pmbus_fan_registers[] = {
     PMBUS_READ_FAN_SPEED_1,
     PMBUS_READ_FAN_SPEED_2,
     PMBUS_READ_FAN_SPEED_3,
     PMBUS_READ_FAN_SPEED_4
 };
 
 static const int pmbus_fan_status_registers[] = {
     PMBUS_STATUS_FAN_12,
     PMBUS_STATUS_FAN_12,
     PMBUS_STATUS_FAN_34,
     PMBUS_STATUS_FAN_34
 };
 
 static const u32 pmbus_fan_flags[] = {
     PMBUS_HAVE_FAN12,
     PMBUS_HAVE_FAN12,
     PMBUS_HAVE_FAN34,
     PMBUS_HAVE_FAN34
 };
 
 static const u32 pmbus_fan_status_flags[] = {
     PMBUS_HAVE_STATUS_FAN12,
     PMBUS_HAVE_STATUS_FAN12,
     PMBUS_HAVE_STATUS_FAN34,
     PMBUS_HAVE_STATUS_FAN34
 };
 
 /* Fans */
 
 /* Precondition: FAN_CONFIG_x_y and FAN_COMMAND_x must exist for the fan ID */
 static int pmbus_add_fan_ctrl(struct i2c_client *client,
         struct pmbus_data *data, int index, int page, int id,
         u8 config)
 {
     struct pmbus_sensor *sensor;
 
     sensor = pmbus_add_sensor(data, "fan", "target", index, page,
                   0xff, PMBUS_VIRT_FAN_TARGET_1 + id, PSC_FAN,
                   false, false, true);
 
     if (!sensor)
         return -ENOMEM;
 
     if (!((data->info->func[page] & PMBUS_HAVE_PWM12) ||
             (data->info->func[page] & PMBUS_HAVE_PWM34)))
         return 0;
 
     sensor = pmbus_add_sensor(data, "pwm", NULL, index, page,
                   0xff, PMBUS_VIRT_PWM_1 + id, PSC_PWM,
                   false, false, true);
 
     if (!sensor)
         return -ENOMEM;
 
     sensor = pmbus_add_sensor(data, "pwm", "enable", index, page,
                   0xff, PMBUS_VIRT_PWM_ENABLE_1 + id, PSC_PWM,
                   true, false, false);
 
     if (!sensor)
         return -ENOMEM;
 
     return 0;
 }
 
 static int pmbus_add_fan_attributes(struct i2c_client *client,
                     struct pmbus_data *data)
 {
     const struct pmbus_driver_info *info = data->info;
     int index = 1;
     int page;
     int ret;
 
     for (page = 0; page < info->pages; page++) {
         int f;
 
         for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) {
             int regval;
 
             if (!(info->func[page] & pmbus_fan_flags[f]))
                 break;
 
             if (!pmbus_check_word_register(client, page,
                                pmbus_fan_registers[f]))
                 break;
 
             /*
              * Skip fan if not installed.
              * Each fan configuration register covers multiple fans,
              * so we have to do some magic.
              */
             regval = _pmbus_read_byte_data(client, page,
                 pmbus_fan_config_registers[f]);
             if (regval < 0 ||
                 (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
                 continue;
 
             if (pmbus_add_sensor(data, "fan", "input", index,
                          page, 0xff, pmbus_fan_registers[f],
                          PSC_FAN, true, true, true) == NULL)
                 return -ENOMEM;
 
             /* Fan control */
             if (pmbus_check_word_register(client, page,
                     pmbus_fan_command_registers[f])) {
                 ret = pmbus_add_fan_ctrl(client, data, index,
                              page, f, regval);
                 if (ret < 0)
                     return ret;
             }
 
             /*
              * Each fan status register covers multiple fans,
              * so we have to do some magic.
              */
             if ((info->func[page] & pmbus_fan_status_flags[f]) &&
                 pmbus_check_byte_register(client,
                     page, pmbus_fan_status_registers[f])) {
                 int reg;
 
                 if (f > 1)  /* fan 3, 4 */
                     reg = PMBUS_STATUS_FAN_34;
                 else
                     reg = PMBUS_STATUS_FAN_12;
                 ret = pmbus_add_boolean(data, "fan",
                     "alarm", index, NULL, NULL, page, reg,
                     PB_FAN_FAN1_WARNING >> (f & 1));
                 if (ret)
                     return ret;
                 ret = pmbus_add_boolean(data, "fan",
                     "fault", index, NULL, NULL, page, reg,
                     PB_FAN_FAN1_FAULT >> (f & 1));
                 if (ret)
                     return ret;
             }
             index++;
         }
     }
     return 0;
 }
 
 struct pmbus_samples_attr {
     int reg;
     char *name;
 };
 
 struct pmbus_samples_reg {
     int page;
     struct pmbus_samples_attr *attr;
     struct device_attribute dev_attr;
 };
 
 static struct pmbus_samples_attr pmbus_samples_registers[] = {
     {
         .reg = PMBUS_VIRT_SAMPLES,
         .name = "samples",
     }, {
         .reg = PMBUS_VIRT_IN_SAMPLES,
         .name = "in_samples",
     }, {
         .reg = PMBUS_VIRT_CURR_SAMPLES,
         .name = "curr_samples",
     }, {
         .reg = PMBUS_VIRT_POWER_SAMPLES,
         .name = "power_samples",
     }, {
         .reg = PMBUS_VIRT_TEMP_SAMPLES,
         .name = "temp_samples",
     }
 };
 
 #define to_samples_reg(x) container_of(x, struct pmbus_samples_reg, dev_attr)
 
 static ssize_t pmbus_show_samples(struct device *dev,
                   struct device_attribute *devattr, char *buf)
 {
     int val;
     struct i2c_client *client = to_i2c_client(dev->parent);
     struct pmbus_samples_reg *reg = to_samples_reg(devattr);
     struct pmbus_data *data = i2c_get_clientdata(client);
 
     mutex_lock(&data->update_lock);
     val = _pmbus_read_word_data(client, reg->page, 0xff, reg->attr->reg);
     mutex_unlock(&data->update_lock);
     if (val < 0)
         return val;
 
     return sysfs_emit(buf, "%d\n", val);
 }
 
 static ssize_t pmbus_set_samples(struct device *dev,
                  struct device_attribute *devattr,
                  const char *buf, size_t count)
 {
     int ret;
     long val;
     struct i2c_client *client = to_i2c_client(dev->parent);
     struct pmbus_samples_reg *reg = to_samples_reg(devattr);
     struct pmbus_data *data = i2c_get_clientdata(client);
 
     if (kstrtol(buf, 0, &val) < 0)
         return -EINVAL;
 
     mutex_lock(&data->update_lock);
     ret = _pmbus_write_word_data(client, reg->page, reg->attr->reg, val);
     mutex_unlock(&data->update_lock);
 
     return ret ? : count;
 }
 
 static int pmbus_add_samples_attr(struct pmbus_data *data, int page,
                   struct pmbus_samples_attr *attr)
 {
     struct pmbus_samples_reg *reg;
 
     reg = devm_kzalloc(data->dev, sizeof(*reg), GFP_KERNEL);
     if (!reg)
         return -ENOMEM;
 
     reg->attr = attr;
     reg->page = page;
 
     pmbus_dev_attr_init(&reg->dev_attr, attr->name, 0644,
                 pmbus_show_samples, pmbus_set_samples);
 
     return pmbus_add_attribute(data, &reg->dev_attr.attr);
 }
 
 static int pmbus_add_samples_attributes(struct i2c_client *client,
                     struct pmbus_data *data)
 {
     const struct pmbus_driver_info *info = data->info;
     int s;
 
     if (!(info->func[0] & PMBUS_HAVE_SAMPLES))
         return 0;
 
     for (s = 0; s < ARRAY_SIZE(pmbus_samples_registers); s++) {
         struct pmbus_samples_attr *attr;
         int ret;
 
         attr = &pmbus_samples_registers[s];
         if (!pmbus_check_word_register(client, 0, attr->reg))
             continue;
 
         ret = pmbus_add_samples_attr(data, 0, attr);
         if (ret)
             return ret;
     }
 
     return 0;
 }
 
 static int pmbus_find_attributes(struct i2c_client *client,
                  struct pmbus_data *data)
 {
     int ret;
 
     /* Voltage sensors */
     ret = pmbus_add_sensor_attrs(client, data, "in", voltage_attributes,
                      ARRAY_SIZE(voltage_attributes));
     if (ret)
         return ret;
 
     /* Current sensors */
     ret = pmbus_add_sensor_attrs(client, data, "curr", current_attributes,
                      ARRAY_SIZE(current_attributes));
     if (ret)
         return ret;
 
     /* Power sensors */
     ret = pmbus_add_sensor_attrs(client, data, "power", power_attributes,
                      ARRAY_SIZE(power_attributes));
     if (ret)
         return ret;
 
     /* Temperature sensors */
     ret = pmbus_add_sensor_attrs(client, data, "temp", temp_attributes,
                      ARRAY_SIZE(temp_attributes));
     if (ret)
         return ret;
 
     /* Fans */
     ret = pmbus_add_fan_attributes(client, data);
     if (ret)
         return ret;
 
     ret = pmbus_add_samples_attributes(client, data);
     return ret;
 }
 
 /*
  * The pmbus_class_attr_map structure maps one sensor class to
  * it's corresponding sensor attributes array.
  */
 struct pmbus_class_attr_map {
     enum pmbus_sensor_classes class;
     int nattr;
     const struct pmbus_sensor_attr *attr;
 };
 
 static const struct pmbus_class_attr_map class_attr_map[] = {
     {
         .class = PSC_VOLTAGE_IN,
         .attr = voltage_attributes,
         .nattr = ARRAY_SIZE(voltage_attributes),
     }, {
         .class = PSC_VOLTAGE_OUT,
         .attr = voltage_attributes,
         .nattr = ARRAY_SIZE(voltage_attributes),
     }, {
         .class = PSC_CURRENT_IN,
         .attr = current_attributes,
         .nattr = ARRAY_SIZE(current_attributes),
     }, {
         .class = PSC_CURRENT_OUT,
         .attr = current_attributes,
         .nattr = ARRAY_SIZE(current_attributes),
     }, {
         .class = PSC_POWER,
         .attr = power_attributes,
         .nattr = ARRAY_SIZE(power_attributes),
     }, {
         .class = PSC_TEMPERATURE,
         .attr = temp_attributes,
         .nattr = ARRAY_SIZE(temp_attributes),
     }
 };
 
 /*
  * Read the coefficients for direct mode.
  */
 static int pmbus_read_coefficients(struct i2c_client *client,
                    struct pmbus_driver_info *info,
                    const struct pmbus_sensor_attr *attr)
 {
     int rv;
     union i2c_smbus_data data;
     enum pmbus_sensor_classes class = attr->class;
     s8 R;
     s16 m, b;
 
     data.block[0] = 2;
     data.block[1] = attr->reg;
     data.block[2] = 0x01;
 
     rv = i2c_smbus_xfer(client->adapter, client->addr, client->flags,
                 I2C_SMBUS_WRITE, PMBUS_COEFFICIENTS,
                 I2C_SMBUS_BLOCK_PROC_CALL, &data);
 
     if (rv < 0)
         return rv;
 
     if (data.block[0] != 5)
         return -EIO;
 
     m = data.block[1] | (data.block[2] << 8);
     b = data.block[3] | (data.block[4] << 8);
     R = data.block[5];
     info->m[class] = m;
     info->b[class] = b;
     info->R[class] = R;
 
     return rv;
 }
 
 static int pmbus_init_coefficients(struct i2c_client *client,
                    struct pmbus_driver_info *info)
 {
     int i, n, ret = -EINVAL;
     const struct pmbus_class_attr_map *map;
     const struct pmbus_sensor_attr *attr;
 
     for (i = 0; i < ARRAY_SIZE(class_attr_map); i++) {
         map = &class_attr_map[i];
         if (info->format[map->class] != direct)
             continue;
         for (n = 0; n < map->nattr; n++) {
             attr = &map->attr[n];
             if (map->class != attr->class)
                 continue;
             ret = pmbus_read_coefficients(client, info, attr);
             if (ret >= 0)
                 break;
         }
         if (ret < 0) {
             dev_err(&client->dev,
                 "No coefficients found for sensor class %d\n",
                 map->class);
             return -EINVAL;
         }
     }
 
     return 0;
 }
 
 /*
  * Identify chip parameters.
  * This function is called for all chips.
  */
 static int pmbus_identify_common(struct i2c_client *client,
                  struct pmbus_data *data, int page)
 {
     int vout_mode = -1;
 
     if (pmbus_check_byte_register(client, page, PMBUS_VOUT_MODE))
         vout_mode = _pmbus_read_byte_data(client, page,
                           PMBUS_VOUT_MODE);
     if (vout_mode >= 0 && vout_mode != 0xff) {
         /*
          * Not all chips support the VOUT_MODE command,
          * so a failure to read it is not an error.
          */
         switch (vout_mode >> 5) {
         case 0: /* linear mode      */
             if (data->info->format[PSC_VOLTAGE_OUT] != linear)
                 return -ENODEV;
 
             data->exponent[page] = ((s8)(vout_mode << 3)) >> 3;
             break;
         case 1: /* VID mode         */
             if (data->info->format[PSC_VOLTAGE_OUT] != vid)
                 return -ENODEV;
             break;
         case 2: /* direct mode      */
             if (data->info->format[PSC_VOLTAGE_OUT] != direct)
                 return -ENODEV;
             break;
         case 3: /* ieee 754 half precision */
             if (data->info->format[PSC_VOLTAGE_OUT] != ieee754)
                 return -ENODEV;
             break;
         default:
             return -ENODEV;
         }
     }
 
     pmbus_clear_fault_page(client, page);
     return 0;
 }
 
 static int pmbus_read_status_byte(struct i2c_client *client, int page)
 {
     return _pmbus_read_byte_data(client, page, PMBUS_STATUS_BYTE);
 }
 
 static int pmbus_read_status_word(struct i2c_client *client, int page)
 {
     return _pmbus_read_word_data(client, page, 0xff, PMBUS_STATUS_WORD);
 }
 
 /* PEC attribute support */
 
 static ssize_t pec_show(struct device *dev, struct device_attribute *dummy,
             char *buf)
 {
     struct i2c_client *client = to_i2c_client(dev);
 
     return sysfs_emit(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));
 }
 
 static ssize_t pec_store(struct device *dev, struct device_attribute *dummy,
              const char *buf, size_t count)
 {
     struct i2c_client *client = to_i2c_client(dev);
     bool enable;
     int err;
 
     err = kstrtobool(buf, &enable);
     if (err < 0)
         return err;
 
     if (enable)
         client->flags |= I2C_CLIENT_PEC;
     else
         client->flags &= ~I2C_CLIENT_PEC;
 
     return count;
 }
 
 static DEVICE_ATTR_RW(pec);
 
 static void pmbus_remove_pec(void *dev)
 {
     device_remove_file(dev, &dev_attr_pec);
 }
 
 static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data,
                  struct pmbus_driver_info *info)
 {
     struct device *dev = &client->dev;
     int page, ret;
 
     /*
      * Figure out if PEC is enabled before accessing any other register.
      * Make sure PEC is disabled, will be enabled later if needed.
      */
     client->flags &= ~I2C_CLIENT_PEC;
 
     /* Enable PEC if the controller and bus supports it */
     if (!(data->flags & PMBUS_NO_CAPABILITY)) {
         ret = i2c_smbus_read_byte_data(client, PMBUS_CAPABILITY);
         if (ret >= 0 && (ret & PB_CAPABILITY_ERROR_CHECK)) {
             if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_PEC))
                 client->flags |= I2C_CLIENT_PEC;
         }
     }
 
     /*
      * Some PMBus chips don't support PMBUS_STATUS_WORD, so try
      * to use PMBUS_STATUS_BYTE instead if that is the case.
      * Bail out if both registers are not supported.
      */
     data->read_status = pmbus_read_status_word;
     ret = i2c_smbus_read_word_data(client, PMBUS_STATUS_WORD);
     if (ret < 0 || ret == 0xffff) {
         data->read_status = pmbus_read_status_byte;
         ret = i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE);
         if (ret < 0 || ret == 0xff) {
             dev_err(dev, "PMBus status register not found\n");
             return -ENODEV;
         }
     } else {
         data->has_status_word = true;
     }
 
     /*
      * Check if the chip is write protected. If it is, we can not clear
      * faults, and we should not try it. Also, in that case, writes into
      * limit registers need to be disabled.
      */
     if (!(data->flags & PMBUS_NO_WRITE_PROTECT)) {
         ret = i2c_smbus_read_byte_data(client, PMBUS_WRITE_PROTECT);
         if (ret > 0 && (ret & PB_WP_ANY))
             data->flags |= PMBUS_WRITE_PROTECTED | PMBUS_SKIP_STATUS_CHECK;
     }
 
     if (data->info->pages)
         pmbus_clear_faults(client);
     else
         pmbus_clear_fault_page(client, -1);
 
     if (info->identify) {
         ret = (*info->identify)(client, info);
         if (ret < 0) {
             dev_err(dev, "Chip identification failed\n");
             return ret;
         }
     }
 
     if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
         dev_err(dev, "Bad number of PMBus pages: %d\n", info->pages);
         return -ENODEV;
     }
 
     for (page = 0; page < info->pages; page++) {
         ret = pmbus_identify_common(client, data, page);
         if (ret < 0) {
             dev_err(dev, "Failed to identify chip capabilities\n");
             return ret;
         }
     }
 
     if (data->flags & PMBUS_USE_COEFFICIENTS_CMD) {
         if (!i2c_check_functionality(client->adapter,
                          I2C_FUNC_SMBUS_BLOCK_PROC_CALL))
             return -ENODEV;
 
         ret = pmbus_init_coefficients(client, info);
         if (ret < 0)
             return ret;
     }
 
     if (client->flags & I2C_CLIENT_PEC) {
         /*
          * If I2C_CLIENT_PEC is set here, both the I2C adapter and the
          * chip support PEC. Add 'pec' attribute to client device to let
          * the user control it.
          */
         ret = device_create_file(dev, &dev_attr_pec);
         if (ret)
             return ret;
         ret = devm_add_action_or_reset(dev, pmbus_remove_pec, dev);
         if (ret)
             return ret;
     }
 
     return 0;
 }
 
 #if IS_ENABLED(CONFIG_REGULATOR)
 static int pmbus_regulator_is_enabled(struct regulator_dev *rdev)
 {
     struct device *dev = rdev_get_dev(rdev);
     struct i2c_client *client = to_i2c_client(dev->parent);
     struct pmbus_data *data = i2c_get_clientdata(client);
     u8 page = rdev_get_id(rdev);
     int ret;
 
     mutex_lock(&data->update_lock);
     ret = _pmbus_read_byte_data(client, page, PMBUS_OPERATION);
     mutex_unlock(&data->update_lock);
 
     if (ret < 0)
         return ret;
 
     return !!(ret & PB_OPERATION_CONTROL_ON);
 }
 
 static int _pmbus_regulator_on_off(struct regulator_dev *rdev, bool enable)
 {
     struct device *dev = rdev_get_dev(rdev);
     struct i2c_client *client = to_i2c_client(dev->parent);
     struct pmbus_data *data = i2c_get_clientdata(client);
     u8 page = rdev_get_id(rdev);
     int ret;
 
     mutex_lock(&data->update_lock);
     ret = pmbus_update_byte_data(client, page, PMBUS_OPERATION,
                      PB_OPERATION_CONTROL_ON,
                      enable ? PB_OPERATION_CONTROL_ON : 0);
     mutex_unlock(&data->update_lock);
 
     return ret;
 }
 
 static int pmbus_regulator_enable(struct regulator_dev *rdev)
 {
     return _pmbus_regulator_on_off(rdev, 1);
 }
 
 static int pmbus_regulator_disable(struct regulator_dev *rdev)
 {
     return _pmbus_regulator_on_off(rdev, 0);
 }
 
 /* A PMBus status flag and the corresponding REGULATOR_ERROR_* flag */
 struct pmbus_regulator_status_assoc {
     int pflag, rflag;
 };
 
 /* PMBus->regulator bit mappings for a PMBus status register */
 struct pmbus_regulator_status_category {
     int func;
     int reg;
     const struct pmbus_regulator_status_assoc *bits; /* zero-terminated */
 };
 
 static const struct pmbus_regulator_status_category pmbus_regulator_flag_map[] = {
     {
         .func = PMBUS_HAVE_STATUS_VOUT,
         .reg = PMBUS_STATUS_VOUT,
         .bits = (const struct pmbus_regulator_status_assoc[]) {
             { PB_VOLTAGE_UV_WARNING, REGULATOR_ERROR_UNDER_VOLTAGE_WARN },
             { PB_VOLTAGE_UV_FAULT,   REGULATOR_ERROR_UNDER_VOLTAGE },
             { PB_VOLTAGE_OV_WARNING, REGULATOR_ERROR_OVER_VOLTAGE_WARN },
             { PB_VOLTAGE_OV_FAULT,   REGULATOR_ERROR_REGULATION_OUT },
             { },
         },
     }, {
         .func = PMBUS_HAVE_STATUS_IOUT,
         .reg = PMBUS_STATUS_IOUT,
         .bits = (const struct pmbus_regulator_status_assoc[]) {
             { PB_IOUT_OC_WARNING,    REGULATOR_ERROR_OVER_CURRENT_WARN },
             { PB_IOUT_OC_FAULT,      REGULATOR_ERROR_OVER_CURRENT },
             { PB_IOUT_OC_LV_FAULT,   REGULATOR_ERROR_OVER_CURRENT },
             { },
         },
     }, {
         .func = PMBUS_HAVE_STATUS_TEMP,
         .reg = PMBUS_STATUS_TEMPERATURE,
         .bits = (const struct pmbus_regulator_status_assoc[]) {
             { PB_TEMP_OT_WARNING,    REGULATOR_ERROR_OVER_TEMP_WARN },
             { PB_TEMP_OT_FAULT,      REGULATOR_ERROR_OVER_TEMP },
             { },
         },
     },
 };
 
 static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
 {
     int i, status;
     const struct pmbus_regulator_status_category *cat;
     const struct pmbus_regulator_status_assoc *bit;
     struct device *dev = rdev_get_dev(rdev);
     struct i2c_client *client = to_i2c_client(dev->parent);
     struct pmbus_data *data = i2c_get_clientdata(client);
     u8 page = rdev_get_id(rdev);
     int func = data->info->func[page];
 
     *flags = 0;
 
     mutex_lock(&data->update_lock);
 
     for (i = 0; i < ARRAY_SIZE(pmbus_regulator_flag_map); i++) {
         cat = &pmbus_regulator_flag_map[i];
         if (!(func & cat->func))
             continue;
 
         status = _pmbus_read_byte_data(client, page, cat->reg);
         if (status < 0) {
             mutex_unlock(&data->update_lock);
             return status;
         }
 
         for (bit = cat->bits; bit->pflag; bit++) {
             if (status & bit->pflag)
                 *flags |= bit->rflag;
         }
     }
 
     /*
      * Map what bits of STATUS_{WORD,BYTE} we can to REGULATOR_ERROR_*
      * bits.  Some of the other bits are tempting (especially for cases
      * where we don't have the relevant PMBUS_HAVE_STATUS_*
      * functionality), but there's an unfortunate ambiguity in that
      * they're defined as indicating a fault *or* a warning, so we can't
      * easily determine whether to report REGULATOR_ERROR_<foo> or
      * REGULATOR_ERROR_<foo>_WARN.
      */
     status = pmbus_get_status(client, page, PMBUS_STATUS_WORD);
     mutex_unlock(&data->update_lock);
     if (status < 0)
         return status;
 
     if (pmbus_regulator_is_enabled(rdev) && (status & PB_STATUS_OFF))
         *flags |= REGULATOR_ERROR_FAIL;
 
     /*
      * Unlike most other status bits, PB_STATUS_{IOUT_OC,VOUT_OV} are
      * defined strictly as fault indicators (not warnings).
      */
     if (status & PB_STATUS_IOUT_OC)
         *flags |= REGULATOR_ERROR_OVER_CURRENT;
     if (status & PB_STATUS_VOUT_OV)
         *flags |= REGULATOR_ERROR_REGULATION_OUT;
 
     /*
      * If we haven't discovered any thermal faults or warnings via
      * PMBUS_STATUS_TEMPERATURE, map PB_STATUS_TEMPERATURE to a warning as
      * a (conservative) best-effort interpretation.
      */
     if (!(*flags & (REGULATOR_ERROR_OVER_TEMP | REGULATOR_ERROR_OVER_TEMP_WARN)) &&
         (status & PB_STATUS_TEMPERATURE))
         *flags |= REGULATOR_ERROR_OVER_TEMP_WARN;
 
     return 0;
 }
 
 static int pmbus_regulator_get_low_margin(struct i2c_client *client, int page)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
     struct pmbus_sensor s = {
         .page = page,
         .class = PSC_VOLTAGE_OUT,
         .convert = true,
         .data = -1,
     };
 
     if (data->vout_low[page] < 0) {
         if (pmbus_check_word_register(client, page, PMBUS_MFR_VOUT_MIN))
             s.data = _pmbus_read_word_data(client, page, 0xff,
                                PMBUS_MFR_VOUT_MIN);
         if (s.data < 0) {
             s.data = _pmbus_read_word_data(client, page, 0xff,
                                PMBUS_VOUT_MARGIN_LOW);
             if (s.data < 0)
                 return s.data;
         }
         data->vout_low[page] = pmbus_reg2data(data, &s);
     }
 
     return data->vout_low[page];
 }
 
 static int pmbus_regulator_get_high_margin(struct i2c_client *client, int page)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
     struct pmbus_sensor s = {
         .page = page,
         .class = PSC_VOLTAGE_OUT,
         .convert = true,
         .data = -1,
     };
 
     if (data->vout_high[page] < 0) {
         if (pmbus_check_word_register(client, page, PMBUS_MFR_VOUT_MAX))
             s.data = _pmbus_read_word_data(client, page, 0xff,
                                PMBUS_MFR_VOUT_MAX);
         if (s.data < 0) {
             s.data = _pmbus_read_word_data(client, page, 0xff,
                                PMBUS_VOUT_MARGIN_HIGH);
             if (s.data < 0)
                 return s.data;
         }
         data->vout_high[page] = pmbus_reg2data(data, &s);
     }
 
     return data->vout_high[page];
 }
 
 static int pmbus_regulator_get_voltage(struct regulator_dev *rdev)
 {
     struct device *dev = rdev_get_dev(rdev);
     struct i2c_client *client = to_i2c_client(dev->parent);
     struct pmbus_data *data = i2c_get_clientdata(client);
     struct pmbus_sensor s = {
         .page = rdev_get_id(rdev),
         .class = PSC_VOLTAGE_OUT,
         .convert = true,
     };
 
     s.data = _pmbus_read_word_data(client, s.page, 0xff, PMBUS_READ_VOUT);
     if (s.data < 0)
         return s.data;
 
     return (int)pmbus_reg2data(data, &s) * 1000; /* unit is uV */
 }
 
 static int pmbus_regulator_set_voltage(struct regulator_dev *rdev, int min_uv,
                        int max_uv, unsigned int *selector)
 {
     struct device *dev = rdev_get_dev(rdev);
     struct i2c_client *client = to_i2c_client(dev->parent);
     struct pmbus_data *data = i2c_get_clientdata(client);
     struct pmbus_sensor s = {
         .page = rdev_get_id(rdev),
         .class = PSC_VOLTAGE_OUT,
         .convert = true,
         .data = -1,
     };
     int val = DIV_ROUND_CLOSEST(min_uv, 1000); /* convert to mV */
     int low, high;
 
     *selector = 0;
 
     low = pmbus_regulator_get_low_margin(client, s.page);
     if (low < 0)
         return low;
 
     high = pmbus_regulator_get_high_margin(client, s.page);
     if (high < 0)
         return high;
 
     /* Make sure we are within margins */
     if (low > val)
         val = low;
     if (high < val)
         val = high;
 
     val = pmbus_data2reg(data, &s, val);
 
     return _pmbus_write_word_data(client, s.page, PMBUS_VOUT_COMMAND, (u16)val);
 }
 
 static int pmbus_regulator_list_voltage(struct regulator_dev *rdev,
                      unsigned int selector)
 {
     struct device *dev = rdev_get_dev(rdev);
     struct i2c_client *client = to_i2c_client(dev->parent);
     int val, low, high;
 
     if (selector >= rdev->desc->n_voltages ||
         selector < rdev->desc->linear_min_sel)
         return -EINVAL;
 
     selector -= rdev->desc->linear_min_sel;
     val = DIV_ROUND_CLOSEST(rdev->desc->min_uV +
                 (rdev->desc->uV_step * selector), 1000); /* convert to mV */
 
     low = pmbus_regulator_get_low_margin(client, rdev_get_id(rdev));
     if (low < 0)
         return low;
 
     high = pmbus_regulator_get_high_margin(client, rdev_get_id(rdev));
     if (high < 0)
         return high;
 
     if (val >= low && val <= high)
         return val * 1000; /* unit is uV */
 
     return 0;
 }
 
 const struct regulator_ops pmbus_regulator_ops = {
     .enable = pmbus_regulator_enable,
     .disable = pmbus_regulator_disable,
     .is_enabled = pmbus_regulator_is_enabled,
     .get_error_flags = pmbus_regulator_get_error_flags,
     .get_voltage = pmbus_regulator_get_voltage,
     .set_voltage = pmbus_regulator_set_voltage,
     .list_voltage = pmbus_regulator_list_voltage,
 };
 EXPORT_SYMBOL_NS_GPL(pmbus_regulator_ops, PMBUS);
 
 static int pmbus_regulator_register(struct pmbus_data *data)
 {
     struct device *dev = data->dev;
     const struct pmbus_driver_info *info = data->info;
     const struct pmbus_platform_data *pdata = dev_get_platdata(dev);
     struct regulator_dev *rdev;
     int i;
 
     for (i = 0; i < info->num_regulators; i++) {
         struct regulator_config config = { };
 
         config.dev = dev;
         config.driver_data = data;
 
         if (pdata && pdata->reg_init_data)
             config.init_data = &pdata->reg_init_data[i];
 
         rdev = devm_regulator_register(dev, &info->reg_desc[i],
                            &config);
         if (IS_ERR(rdev))
             return dev_err_probe(dev, PTR_ERR(rdev),
                          "Failed to register %s regulator\n",
                          info->reg_desc[i].name);
     }
 
     return 0;
 }
 #else
 static int pmbus_regulator_register(struct pmbus_data *data)
 {
     return 0;
 }
 #endif
 
 static struct dentry *pmbus_debugfs_dir;    /* pmbus debugfs directory */
 
 #if IS_ENABLED(CONFIG_DEBUG_FS)
 static int pmbus_debugfs_get(void *data, u64 *val)
 {
     int rc;
     struct pmbus_debugfs_entry *entry = data;
 
     rc = _pmbus_read_byte_data(entry->client, entry->page, entry->reg);
     if (rc < 0)
         return rc;
 
     *val = rc;
 
     return 0;
 }
 DEFINE_DEBUGFS_ATTRIBUTE(pmbus_debugfs_ops, pmbus_debugfs_get, NULL,
              "0x%02llx\n");
 
 static int pmbus_debugfs_get_status(void *data, u64 *val)
 {
     int rc;
     struct pmbus_debugfs_entry *entry = data;
     struct pmbus_data *pdata = i2c_get_clientdata(entry->client);
 
     rc = pdata->read_status(entry->client, entry->page);
     if (rc < 0)
         return rc;
 
     *val = rc;
 
     return 0;
 }
 DEFINE_DEBUGFS_ATTRIBUTE(pmbus_debugfs_ops_status, pmbus_debugfs_get_status,
              NULL, "0x%04llx\n");
 
 static ssize_t pmbus_debugfs_mfr_read(struct file *file, char __user *buf,
                        size_t count, loff_t *ppos)
 {
     int rc;
     struct pmbus_debugfs_entry *entry = file->private_data;
     char data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
 
     rc = pmbus_read_block_data(entry->client, entry->page, entry->reg,
                    data);
     if (rc < 0)
         return rc;
 
     /* Add newline at the end of a read data */
     data[rc] = '\n';
 
     /* Include newline into the length */
     rc += 1;
 
     return simple_read_from_buffer(buf, count, ppos, data, rc);
 }
 
 static const struct file_operations pmbus_debugfs_ops_mfr = {
     .llseek = noop_llseek,
     .read = pmbus_debugfs_mfr_read,
     .write = NULL,
     .open = simple_open,
 };
 
 static void pmbus_remove_debugfs(void *data)
 {
     struct dentry *entry = data;
 
     debugfs_remove_recursive(entry);
 }
 
 static int pmbus_init_debugfs(struct i2c_client *client,
                   struct pmbus_data *data)
 {
     int i, idx = 0;
     char name[PMBUS_NAME_SIZE];
     struct pmbus_debugfs_entry *entries;
 
     if (!pmbus_debugfs_dir)
         return -ENODEV;
 
     /*
      * Create the debugfs directory for this device. Use the hwmon device
      * name to avoid conflicts (hwmon numbers are globally unique).
      */
     data->debugfs = debugfs_create_dir(dev_name(data->hwmon_dev),
                        pmbus_debugfs_dir);
     if (IS_ERR_OR_NULL(data->debugfs)) {
         data->debugfs = NULL;
         return -ENODEV;
     }
 
     /*
      * Allocate the max possible entries we need.
      * 6 entries device-specific
      * 10 entries page-specific
      */
     entries = devm_kcalloc(data->dev,
                    6 + data->info->pages * 10, sizeof(*entries),
                    GFP_KERNEL);
     if (!entries)
         return -ENOMEM;
 
     /*
      * Add device-specific entries.
      * Please note that the PMBUS standard allows all registers to be
      * page-specific.
      * To reduce the number of debugfs entries for devices with many pages
      * assume that values of the following registers are the same for all
      * pages and report values only for page 0.
      */
     if (pmbus_check_block_register(client, 0, PMBUS_MFR_ID)) {
         entries[idx].client = client;
         entries[idx].page = 0;
         entries[idx].reg = PMBUS_MFR_ID;
         debugfs_create_file("mfr_id", 0444, data->debugfs,
                     &entries[idx++],
                     &pmbus_debugfs_ops_mfr);
     }
 
     if (pmbus_check_block_register(client, 0, PMBUS_MFR_MODEL)) {
         entries[idx].client = client;
         entries[idx].page = 0;
         entries[idx].reg = PMBUS_MFR_MODEL;
         debugfs_create_file("mfr_model", 0444, data->debugfs,
                     &entries[idx++],
                     &pmbus_debugfs_ops_mfr);
     }
 
     if (pmbus_check_block_register(client, 0, PMBUS_MFR_REVISION)) {
         entries[idx].client = client;
         entries[idx].page = 0;
         entries[idx].reg = PMBUS_MFR_REVISION;
         debugfs_create_file("mfr_revision", 0444, data->debugfs,
                     &entries[idx++],
                     &pmbus_debugfs_ops_mfr);
     }
 
     if (pmbus_check_block_register(client, 0, PMBUS_MFR_LOCATION)) {
         entries[idx].client = client;
         entries[idx].page = 0;
         entries[idx].reg = PMBUS_MFR_LOCATION;
         debugfs_create_file("mfr_location", 0444, data->debugfs,
                     &entries[idx++],
                     &pmbus_debugfs_ops_mfr);
     }
 
     if (pmbus_check_block_register(client, 0, PMBUS_MFR_DATE)) {
         entries[idx].client = client;
         entries[idx].page = 0;
         entries[idx].reg = PMBUS_MFR_DATE;
         debugfs_create_file("mfr_date", 0444, data->debugfs,
                     &entries[idx++],
                     &pmbus_debugfs_ops_mfr);
     }
 
     if (pmbus_check_block_register(client, 0, PMBUS_MFR_SERIAL)) {
         entries[idx].client = client;
         entries[idx].page = 0;
         entries[idx].reg = PMBUS_MFR_SERIAL;
         debugfs_create_file("mfr_serial", 0444, data->debugfs,
                     &entries[idx++],
                     &pmbus_debugfs_ops_mfr);
     }
 
     /* Add page specific entries */
     for (i = 0; i < data->info->pages; ++i) {
         /* Check accessibility of status register if it's not page 0 */
         if (!i || pmbus_check_status_register(client, i)) {
             /* No need to set reg as we have special read op. */
             entries[idx].client = client;
             entries[idx].page = i;
             scnprintf(name, PMBUS_NAME_SIZE, "status%d", i);
             debugfs_create_file(name, 0444, data->debugfs,
                         &entries[idx++],
                         &pmbus_debugfs_ops_status);
         }
 
         if (data->info->func[i] & PMBUS_HAVE_STATUS_VOUT) {
             entries[idx].client = client;
             entries[idx].page = i;
             entries[idx].reg = PMBUS_STATUS_VOUT;
             scnprintf(name, PMBUS_NAME_SIZE, "status%d_vout", i);
             debugfs_create_file(name, 0444, data->debugfs,
                         &entries[idx++],
                         &pmbus_debugfs_ops);
         }
 
         if (data->info->func[i] & PMBUS_HAVE_STATUS_IOUT) {
             entries[idx].client = client;
             entries[idx].page = i;
             entries[idx].reg = PMBUS_STATUS_IOUT;
             scnprintf(name, PMBUS_NAME_SIZE, "status%d_iout", i);
             debugfs_create_file(name, 0444, data->debugfs,
                         &entries[idx++],
                         &pmbus_debugfs_ops);
         }
 
         if (data->info->func[i] & PMBUS_HAVE_STATUS_INPUT) {
             entries[idx].client = client;
             entries[idx].page = i;
             entries[idx].reg = PMBUS_STATUS_INPUT;
             scnprintf(name, PMBUS_NAME_SIZE, "status%d_input", i);
             debugfs_create_file(name, 0444, data->debugfs,
                         &entries[idx++],
                         &pmbus_debugfs_ops);
         }
 
         if (data->info->func[i] & PMBUS_HAVE_STATUS_TEMP) {
             entries[idx].client = client;
             entries[idx].page = i;
             entries[idx].reg = PMBUS_STATUS_TEMPERATURE;
             scnprintf(name, PMBUS_NAME_SIZE, "status%d_temp", i);
             debugfs_create_file(name, 0444, data->debugfs,
                         &entries[idx++],
                         &pmbus_debugfs_ops);
         }
 
         if (pmbus_check_byte_register(client, i, PMBUS_STATUS_CML)) {
             entries[idx].client = client;
             entries[idx].page = i;
             entries[idx].reg = PMBUS_STATUS_CML;
             scnprintf(name, PMBUS_NAME_SIZE, "status%d_cml", i);
             debugfs_create_file(name, 0444, data->debugfs,
                         &entries[idx++],
                         &pmbus_debugfs_ops);
         }
 
         if (pmbus_check_byte_register(client, i, PMBUS_STATUS_OTHER)) {
             entries[idx].client = client;
             entries[idx].page = i;
             entries[idx].reg = PMBUS_STATUS_OTHER;
             scnprintf(name, PMBUS_NAME_SIZE, "status%d_other", i);
             debugfs_create_file(name, 0444, data->debugfs,
                         &entries[idx++],
                         &pmbus_debugfs_ops);
         }
 
         if (pmbus_check_byte_register(client, i,
                           PMBUS_STATUS_MFR_SPECIFIC)) {
             entries[idx].client = client;
             entries[idx].page = i;
             entries[idx].reg = PMBUS_STATUS_MFR_SPECIFIC;
             scnprintf(name, PMBUS_NAME_SIZE, "status%d_mfr", i);
             debugfs_create_file(name, 0444, data->debugfs,
                         &entries[idx++],
                         &pmbus_debugfs_ops);
         }
 
         if (data->info->func[i] & PMBUS_HAVE_STATUS_FAN12) {
             entries[idx].client = client;
             entries[idx].page = i;
             entries[idx].reg = PMBUS_STATUS_FAN_12;
             scnprintf(name, PMBUS_NAME_SIZE, "status%d_fan12", i);
             debugfs_create_file(name, 0444, data->debugfs,
                         &entries[idx++],
                         &pmbus_debugfs_ops);
         }
 
         if (data->info->func[i] & PMBUS_HAVE_STATUS_FAN34) {
             entries[idx].client = client;
             entries[idx].page = i;
             entries[idx].reg = PMBUS_STATUS_FAN_34;
             scnprintf(name, PMBUS_NAME_SIZE, "status%d_fan34", i);
             debugfs_create_file(name, 0444, data->debugfs,
                         &entries[idx++],
                         &pmbus_debugfs_ops);
         }
     }
 
     return devm_add_action_or_reset(data->dev,
                     pmbus_remove_debugfs, data->debugfs);
 }
 #else
 static int pmbus_init_debugfs(struct i2c_client *client,
                   struct pmbus_data *data)
 {
     return 0;
 }
 #endif  /* IS_ENABLED(CONFIG_DEBUG_FS) */
 
 int pmbus_do_probe(struct i2c_client *client, struct pmbus_driver_info *info)
 {
     struct device *dev = &client->dev;
     const struct pmbus_platform_data *pdata = dev_get_platdata(dev);
     struct pmbus_data *data;
     size_t groups_num = 0;
     int ret;
     int i;
     char *name;
 
     if (!info)
         return -ENODEV;
 
     if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
                      | I2C_FUNC_SMBUS_BYTE_DATA
                      | I2C_FUNC_SMBUS_WORD_DATA))
         return -ENODEV;
 
     data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
     if (!data)
         return -ENOMEM;
 
     if (info->groups)
         while (info->groups[groups_num])
             groups_num++;
 
     data->groups = devm_kcalloc(dev, groups_num + 2, sizeof(void *),
                     GFP_KERNEL);
     if (!data->groups)
         return -ENOMEM;
 
     i2c_set_clientdata(client, data);
     mutex_init(&data->update_lock);
     data->dev = dev;
 
     if (pdata)
         data->flags = pdata->flags;
     data->info = info;
     data->currpage = -1;
     data->currphase = -1;
 
     for (i = 0; i < ARRAY_SIZE(data->vout_low); i++) {
         data->vout_low[i] = -1;
         data->vout_high[i] = -1;
     }
 
     ret = pmbus_init_common(client, data, info);
     if (ret < 0)
         return ret;
 
     ret = pmbus_find_attributes(client, data);
     if (ret)
         return ret;
 
     /*
      * If there are no attributes, something is wrong.
      * Bail out instead of trying to register nothing.
      */
     if (!data->num_attributes) {
         dev_err(dev, "No attributes found\n");
         return -ENODEV;
     }
 
     name = devm_kstrdup(dev, client->name, GFP_KERNEL);
     if (!name)
         return -ENOMEM;
     strreplace(name, '-', '_');
 
     data->groups[0] = &data->group;
     memcpy(data->groups + 1, info->groups, sizeof(void *) * groups_num);
     data->hwmon_dev = devm_hwmon_device_register_with_groups(dev,
                     name, data, data->groups);
     if (IS_ERR(data->hwmon_dev)) {
         dev_err(dev, "Failed to register hwmon device\n");
         return PTR_ERR(data->hwmon_dev);
     }
 
     ret = pmbus_regulator_register(data);
     if (ret)
         return ret;
 
     ret = pmbus_init_debugfs(client, data);
     if (ret)
         dev_warn(dev, "Failed to register debugfs\n");
 
     return 0;
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_do_probe, PMBUS);
 
 struct dentry *pmbus_get_debugfs_dir(struct i2c_client *client)
 {
     struct pmbus_data *data = i2c_get_clientdata(client);
 
     return data->debugfs;
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_get_debugfs_dir, PMBUS);
 
 static int __init pmbus_core_init(void)
 {
     pmbus_debugfs_dir = debugfs_create_dir("pmbus", NULL);
     if (IS_ERR(pmbus_debugfs_dir))
         pmbus_debugfs_dir = NULL;
 
     return 0;
 }
 
 static void __exit pmbus_core_exit(void)
 {
     debugfs_remove_recursive(pmbus_debugfs_dir);
 }
 
 module_init(pmbus_core_init);
 module_exit(pmbus_core_exit);
 
 MODULE_AUTHOR("Guenter Roeck");
 MODULE_DESCRIPTION("PMBus core driver");
 MODULE_LICENSE("GPL");