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 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * lm90.c - Part of lm_sensors, Linux kernel modules for hardware
  *          monitoring
  * Copyright (C) 2003-2010  Jean Delvare <jdelvare@suse.de>
  *
  * Based on the lm83 driver. The LM90 is a sensor chip made by National
  * Semiconductor. It reports up to two temperatures (its own plus up to
  * one external one) with a 0.125 deg resolution (1 deg for local
  * temperature) and a 3-4 deg accuracy.
  *
  * This driver also supports the LM89 and LM99, two other sensor chips
  * made by National Semiconductor. Both have an increased remote
  * temperature measurement accuracy (1 degree), and the LM99
  * additionally shifts remote temperatures (measured and limits) by 16
  * degrees, which allows for higher temperatures measurement.
  * Note that there is no way to differentiate between both chips.
  * When device is auto-detected, the driver will assume an LM99.
  *
  * This driver also supports the LM86, another sensor chip made by
  * National Semiconductor. It is exactly similar to the LM90 except it
  * has a higher accuracy.
  *
  * This driver also supports the ADM1032, a sensor chip made by Analog
  * Devices. That chip is similar to the LM90, with a few differences
  * that are not handled by this driver. Among others, it has a higher
  * accuracy than the LM90, much like the LM86 does.
  *
  * This driver also supports the MAX6657, MAX6658 and MAX6659 sensor
  * chips made by Maxim. These chips are similar to the LM86.
  * Note that there is no easy way to differentiate between the three
  * variants. We use the device address to detect MAX6659, which will result
  * in a detection as max6657 if it is on address 0x4c. The extra address
  * and features of the MAX6659 are only supported if the chip is configured
  * explicitly as max6659, or if its address is not 0x4c.
  * These chips lack the remote temperature offset feature.
  *
  * This driver also supports the MAX6654 chip made by Maxim. This chip can be
  * at 9 different addresses, similar to MAX6680/MAX6681. The MAX6654 is similar
  * to MAX6657/MAX6658/MAX6659, but does not support critical temperature
  * limits. Extended range is available by setting the configuration register
  * accordingly, and is done during initialization. Extended precision is only
  * available at conversion rates of 1 Hz and slower. Note that extended
  * precision is not enabled by default, as this driver initializes all chips
  * to 2 Hz by design. The driver also supports MAX6690, which is practically
  * identical to MAX6654.
  *
  * This driver also supports the MAX6646, MAX6647, MAX6648, MAX6649 and
  * MAX6692 chips made by Maxim.  These are again similar to the LM86,
  * but they use unsigned temperature values and can report temperatures
  * from 0 to 145 degrees.
  *
  * This driver also supports the MAX6680 and MAX6681, two other sensor
  * chips made by Maxim. These are quite similar to the other Maxim
  * chips. The MAX6680 and MAX6681 only differ in the pinout so they can
  * be treated identically.
  *
  * This driver also supports the MAX6695 and MAX6696, two other sensor
  * chips made by Maxim. These are also quite similar to other Maxim
  * chips, but support three temperature sensors instead of two. MAX6695
  * and MAX6696 only differ in the pinout so they can be treated identically.
  *
  * This driver also supports ADT7461 and ADT7461A from Analog Devices as well as
  * NCT1008 from ON Semiconductor. The chips are supported in both compatibility
  * and extended mode. They are mostly compatible with LM90 except for a data
  * format difference for the temperature value registers.
  *
  * This driver also supports ADT7481, ADT7482, and ADT7483 from Analog Devices
  * / ON Semiconductor. The chips are similar to ADT7461 but support two external
  * temperature sensors.
  *
  * This driver also supports NCT72, NCT214, and NCT218 from ON Semiconductor.
  * The chips are similar to ADT7461/ADT7461A but have full PEC support
  * (undocumented).
  *
  * This driver also supports the SA56004 from Philips. This device is
  * pin-compatible with the LM86, the ED/EDP parts are also address-compatible.
  *
  * This driver also supports the G781 from GMT. This device is compatible
  * with the ADM1032.
  *
  * This driver also supports TMP451 and TMP461 from Texas Instruments.
  * Those devices are supported in both compatibility and extended mode.
  * They are mostly compatible with ADT7461 except for local temperature
  * low byte register and max conversion rate.
  *
  * This driver also supports MAX1617 and various clones such as G767
  * and NE1617. Such clones will be detected as MAX1617.
  *
  * This driver also supports NE1618 from Philips. It is similar to NE1617
  * but supports 11 bit external temperature values.
  *
  * Since the LM90 was the first chipset supported by this driver, most
  * comments will refer to this chipset, but are actually general and
  * concern all supported chipsets, unless mentioned otherwise.
  */
 
 #include <linux/bits.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/jiffies.h>
 #include <linux/hwmon.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/of_device.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/workqueue.h>
 
 /* The maximum number of channels currently supported */
 #define MAX_CHANNELS    3
 
 /*
  * Addresses to scan
  * Address is fully defined internally and cannot be changed except for
  * MAX6659, MAX6680 and MAX6681.
  * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, ADT7461A, MAX6649,
  * MAX6657, MAX6658, NCT1008 and W83L771 have address 0x4c.
  * ADM1032-2, ADT7461-2, ADT7461A-2, LM89-1, LM99-1, MAX6646, and NCT1008D
  * have address 0x4d.
  * MAX6647 has address 0x4e.
  * MAX6659 can have address 0x4c, 0x4d or 0x4e.
  * MAX6654, MAX6680, and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29,
  * 0x2a, 0x2b, 0x4c, 0x4d or 0x4e.
  * SA56004 can have address 0x48 through 0x4F.
  */
 
 static const unsigned short normal_i2c[] = {
     0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x48, 0x49, 0x4a, 0x4b, 0x4c,
     0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
 
 enum chips { adm1023, adm1032, adt7461, adt7461a, adt7481,
     g781, lm84, lm90, lm99,
     max1617, max6642, max6646, max6648, max6654, max6657, max6659, max6680, max6696,
     nct210, nct72, ne1618, sa56004, tmp451, tmp461, w83l771,
 };
 
 /*
  * The LM90 registers
  */
 
 #define LM90_REG_MAN_ID         0xFE
 #define LM90_REG_CHIP_ID        0xFF
 #define LM90_REG_CONFIG1        0x03
 #define LM90_REG_CONFIG2        0xBF
 #define LM90_REG_CONVRATE       0x04
 #define LM90_REG_STATUS         0x02
 #define LM90_REG_LOCAL_TEMP     0x00
 #define LM90_REG_LOCAL_HIGH     0x05
 #define LM90_REG_LOCAL_LOW      0x06
 #define LM90_REG_LOCAL_CRIT     0x20
 #define LM90_REG_REMOTE_TEMPH       0x01
 #define LM90_REG_REMOTE_TEMPL       0x10
 #define LM90_REG_REMOTE_OFFSH       0x11
 #define LM90_REG_REMOTE_OFFSL       0x12
 #define LM90_REG_REMOTE_HIGHH       0x07
 #define LM90_REG_REMOTE_HIGHL       0x13
 #define LM90_REG_REMOTE_LOWH        0x08
 #define LM90_REG_REMOTE_LOWL        0x14
 #define LM90_REG_REMOTE_CRIT        0x19
 #define LM90_REG_TCRIT_HYST     0x21
 
 /* MAX6646/6647/6649/6654/6657/6658/6659/6695/6696 registers */
 
 #define MAX6657_REG_LOCAL_TEMPL     0x11
 #define MAX6696_REG_STATUS2     0x12
 #define MAX6659_REG_REMOTE_EMERG    0x16
 #define MAX6659_REG_LOCAL_EMERG     0x17
 
 /*  SA56004 registers */
 
 #define SA56004_REG_LOCAL_TEMPL     0x22
 
 #define LM90_MAX_CONVRATE_MS    16000   /* Maximum conversion rate in ms */
 
 /* TMP451/TMP461 registers */
 #define TMP451_REG_LOCAL_TEMPL      0x15
 #define TMP451_REG_CONALERT     0x22
 
 #define TMP461_REG_CHEN         0x16
 #define TMP461_REG_DFC          0x24
 
 /* ADT7481 registers */
 #define ADT7481_REG_STATUS2     0x23
 #define ADT7481_REG_CONFIG2     0x24
 
 #define ADT7481_REG_MAN_ID      0x3e
 #define ADT7481_REG_CHIP_ID     0x3d
 
 /* Device features */
 #define LM90_HAVE_EXTENDED_TEMP BIT(0)  /* extended temperature support */
 #define LM90_HAVE_OFFSET    BIT(1)  /* temperature offset register  */
 #define LM90_HAVE_UNSIGNED_TEMP BIT(2)  /* temperatures are unsigned    */
 #define LM90_HAVE_REM_LIMIT_EXT BIT(3)  /* extended remote limit    */
 #define LM90_HAVE_EMERGENCY BIT(4)  /* 3rd upper (emergency) limit  */
 #define LM90_HAVE_EMERGENCY_ALARM BIT(5)/* emergency alarm      */
 #define LM90_HAVE_TEMP3     BIT(6)  /* 3rd temperature sensor   */
 #define LM90_HAVE_BROKEN_ALERT  BIT(7)  /* Broken alert         */
 #define LM90_PAUSE_FOR_CONFIG   BIT(8)  /* Pause conversion for config  */
 #define LM90_HAVE_CRIT      BIT(9)  /* Chip supports CRIT/OVERT register    */
 #define LM90_HAVE_CRIT_ALRM_SWP BIT(10) /* critical alarm bits swapped  */
 #define LM90_HAVE_PEC       BIT(11) /* Chip supports PEC        */
 #define LM90_HAVE_PARTIAL_PEC   BIT(12) /* Partial PEC support (adm1032)*/
 #define LM90_HAVE_ALARMS    BIT(13) /* Create 'alarms' attribute    */
 #define LM90_HAVE_EXT_UNSIGNED  BIT(14) /* extended unsigned temperature*/
 #define LM90_HAVE_LOW       BIT(15) /* low limits           */
 #define LM90_HAVE_CONVRATE  BIT(16) /* conversion rate      */
 #define LM90_HAVE_REMOTE_EXT    BIT(17) /* extended remote temperature  */
 #define LM90_HAVE_FAULTQUEUE    BIT(18) /* configurable samples count   */
 
 /* LM90 status */
 #define LM90_STATUS_LTHRM   BIT(0)  /* local THERM limit tripped */
 #define LM90_STATUS_RTHRM   BIT(1)  /* remote THERM limit tripped */
 #define LM90_STATUS_ROPEN   BIT(2)  /* remote is an open circuit */
 #define LM90_STATUS_RLOW    BIT(3)  /* remote low temp limit tripped */
 #define LM90_STATUS_RHIGH   BIT(4)  /* remote high temp limit tripped */
 #define LM90_STATUS_LLOW    BIT(5)  /* local low temp limit tripped */
 #define LM90_STATUS_LHIGH   BIT(6)  /* local high temp limit tripped */
 #define LM90_STATUS_BUSY    BIT(7)  /* conversion is ongoing */
 
 /* MAX6695/6696 and ADT7481 2nd status register */
 #define MAX6696_STATUS2_R2THRM  BIT(1)  /* remote2 THERM limit tripped */
 #define MAX6696_STATUS2_R2OPEN  BIT(2)  /* remote2 is an open circuit */
 #define MAX6696_STATUS2_R2LOW   BIT(3)  /* remote2 low temp limit tripped */
 #define MAX6696_STATUS2_R2HIGH  BIT(4)  /* remote2 high temp limit tripped */
 #define MAX6696_STATUS2_ROT2    BIT(5)  /* remote emergency limit tripped */
 #define MAX6696_STATUS2_R2OT2   BIT(6)  /* remote2 emergency limit tripped */
 #define MAX6696_STATUS2_LOT2    BIT(7)  /* local emergency limit tripped */
 
 /*
  * Driver data (common to all clients)
  */
 
 static const struct i2c_device_id lm90_id[] = {
     { "adm1020", max1617 },
     { "adm1021", max1617 },
     { "adm1023", adm1023 },
     { "adm1032", adm1032 },
     { "adt7421", adt7461a },
     { "adt7461", adt7461 },
     { "adt7461a", adt7461a },
     { "adt7481", adt7481 },
     { "adt7482", adt7481 },
     { "adt7483a", adt7481 },
     { "g781", g781 },
     { "gl523sm", max1617 },
     { "lm84", lm84 },
     { "lm86", lm90 },
     { "lm89", lm90 },
     { "lm90", lm90 },
     { "lm99", lm99 },
     { "max1617", max1617 },
     { "max6642", max6642 },
     { "max6646", max6646 },
     { "max6647", max6646 },
     { "max6648", max6648 },
     { "max6649", max6646 },
     { "max6654", max6654 },
     { "max6657", max6657 },
     { "max6658", max6657 },
     { "max6659", max6659 },
     { "max6680", max6680 },
     { "max6681", max6680 },
     { "max6690", max6654 },
     { "max6692", max6648 },
     { "max6695", max6696 },
     { "max6696", max6696 },
     { "mc1066", max1617 },
     { "nct1008", adt7461a },
     { "nct210", nct210 },
     { "nct214", nct72 },
     { "nct218", nct72 },
     { "nct72", nct72 },
     { "ne1618", ne1618 },
     { "w83l771", w83l771 },
     { "sa56004", sa56004 },
     { "thmc10", max1617 },
     { "tmp451", tmp451 },
     { "tmp461", tmp461 },
     { }
 };
 MODULE_DEVICE_TABLE(i2c, lm90_id);
 
 static const struct of_device_id __maybe_unused lm90_of_match[] = {
     {
         .compatible = "adi,adm1032",
         .data = (void *)adm1032
     },
     {
         .compatible = "adi,adt7461",
         .data = (void *)adt7461
     },
     {
         .compatible = "adi,adt7461a",
         .data = (void *)adt7461a
     },
     {
         .compatible = "adi,adt7481",
         .data = (void *)adt7481
     },
     {
         .compatible = "gmt,g781",
         .data = (void *)g781
     },
     {
         .compatible = "national,lm90",
         .data = (void *)lm90
     },
     {
         .compatible = "national,lm86",
         .data = (void *)lm90
     },
     {
         .compatible = "national,lm89",
         .data = (void *)lm90
     },
     {
         .compatible = "national,lm99",
         .data = (void *)lm99
     },
     {
         .compatible = "dallas,max6646",
         .data = (void *)max6646
     },
     {
         .compatible = "dallas,max6647",
         .data = (void *)max6646
     },
     {
         .compatible = "dallas,max6649",
         .data = (void *)max6646
     },
     {
         .compatible = "dallas,max6654",
         .data = (void *)max6654
     },
     {
         .compatible = "dallas,max6657",
         .data = (void *)max6657
     },
     {
         .compatible = "dallas,max6658",
         .data = (void *)max6657
     },
     {
         .compatible = "dallas,max6659",
         .data = (void *)max6659
     },
     {
         .compatible = "dallas,max6680",
         .data = (void *)max6680
     },
     {
         .compatible = "dallas,max6681",
         .data = (void *)max6680
     },
     {
         .compatible = "dallas,max6695",
         .data = (void *)max6696
     },
     {
         .compatible = "dallas,max6696",
         .data = (void *)max6696
     },
     {
         .compatible = "onnn,nct1008",
         .data = (void *)adt7461a
     },
     {
         .compatible = "onnn,nct214",
         .data = (void *)nct72
     },
     {
         .compatible = "onnn,nct218",
         .data = (void *)nct72
     },
     {
         .compatible = "onnn,nct72",
         .data = (void *)nct72
     },
     {
         .compatible = "winbond,w83l771",
         .data = (void *)w83l771
     },
     {
         .compatible = "nxp,sa56004",
         .data = (void *)sa56004
     },
     {
         .compatible = "ti,tmp451",
         .data = (void *)tmp451
     },
     {
         .compatible = "ti,tmp461",
         .data = (void *)tmp461
     },
     { },
 };
 MODULE_DEVICE_TABLE(of, lm90_of_match);
 
 /*
  * chip type specific parameters
  */
 struct lm90_params {
     u32 flags;      /* Capabilities */
     u16 alert_alarms;   /* Which alarm bits trigger ALERT# */
                 /* Upper 8 bits for max6695/96 */
     u8 max_convrate;    /* Maximum conversion rate register value */
     u8 resolution;      /* 16-bit resolution (default 11 bit) */
     u8 reg_status2;     /* 2nd status register (optional) */
     u8 reg_local_ext;   /* Extended local temp register (optional) */
     u8 faultqueue_mask; /* fault queue bit mask */
     u8 faultqueue_depth;    /* fault queue depth if mask is used */
 };
 
 static const struct lm90_params lm90_params[] = {
     [adm1023] = {
         .flags = LM90_HAVE_ALARMS | LM90_HAVE_OFFSET | LM90_HAVE_BROKEN_ALERT
           | LM90_HAVE_REM_LIMIT_EXT | LM90_HAVE_LOW | LM90_HAVE_CONVRATE
           | LM90_HAVE_REMOTE_EXT,
         .alert_alarms = 0x7c,
         .resolution = 8,
         .max_convrate = 7,
     },
     [adm1032] = {
         .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
           | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_CRIT
           | LM90_HAVE_PARTIAL_PEC | LM90_HAVE_ALARMS
           | LM90_HAVE_LOW | LM90_HAVE_CONVRATE | LM90_HAVE_REMOTE_EXT
           | LM90_HAVE_FAULTQUEUE,
         .alert_alarms = 0x7c,
         .max_convrate = 10,
     },
     [adt7461] = {
         /*
          * Standard temperature range is supposed to be unsigned,
          * but that does not match reality. Negative temperatures
          * are always reported.
          */
         .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
           | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXTENDED_TEMP
           | LM90_HAVE_CRIT | LM90_HAVE_PARTIAL_PEC
           | LM90_HAVE_ALARMS | LM90_HAVE_LOW | LM90_HAVE_CONVRATE
           | LM90_HAVE_REMOTE_EXT | LM90_HAVE_FAULTQUEUE,
         .alert_alarms = 0x7c,
         .max_convrate = 10,
         .resolution = 10,
     },
     [adt7461a] = {
         .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
           | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXTENDED_TEMP
           | LM90_HAVE_CRIT | LM90_HAVE_PEC | LM90_HAVE_ALARMS
           | LM90_HAVE_LOW | LM90_HAVE_CONVRATE | LM90_HAVE_REMOTE_EXT
           | LM90_HAVE_FAULTQUEUE,
         .alert_alarms = 0x7c,
         .max_convrate = 10,
     },
     [adt7481] = {
         .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
           | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXTENDED_TEMP
           | LM90_HAVE_UNSIGNED_TEMP | LM90_HAVE_PEC
           | LM90_HAVE_TEMP3 | LM90_HAVE_CRIT | LM90_HAVE_LOW
           | LM90_HAVE_CONVRATE | LM90_HAVE_REMOTE_EXT
           | LM90_HAVE_FAULTQUEUE,
         .alert_alarms = 0x1c7c,
         .max_convrate = 11,
         .resolution = 10,
         .reg_status2 = ADT7481_REG_STATUS2,
     },
     [g781] = {
         .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
           | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_CRIT
           | LM90_HAVE_ALARMS | LM90_HAVE_LOW | LM90_HAVE_CONVRATE
           | LM90_HAVE_REMOTE_EXT | LM90_HAVE_FAULTQUEUE,
         .alert_alarms = 0x7c,
         .max_convrate = 7,
     },
     [lm84] = {
         .flags = LM90_HAVE_ALARMS,
         .resolution = 8,
     },
     [lm90] = {
         .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
           | LM90_HAVE_CRIT | LM90_HAVE_ALARMS | LM90_HAVE_LOW
           | LM90_HAVE_CONVRATE | LM90_HAVE_REMOTE_EXT
           | LM90_HAVE_FAULTQUEUE,
         .alert_alarms = 0x7b,
         .max_convrate = 9,
         .faultqueue_mask = BIT(0),
         .faultqueue_depth = 3,
     },
     [lm99] = {
         .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
           | LM90_HAVE_CRIT | LM90_HAVE_ALARMS | LM90_HAVE_LOW
           | LM90_HAVE_CONVRATE | LM90_HAVE_REMOTE_EXT
           | LM90_HAVE_FAULTQUEUE,
         .alert_alarms = 0x7b,
         .max_convrate = 9,
         .faultqueue_mask = BIT(0),
         .faultqueue_depth = 3,
     },
     [max1617] = {
         .flags = LM90_HAVE_CONVRATE | LM90_HAVE_BROKEN_ALERT |
           LM90_HAVE_LOW | LM90_HAVE_ALARMS,
         .alert_alarms = 0x78,
         .resolution = 8,
         .max_convrate = 7,
     },
     [max6642] = {
         .flags = LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXT_UNSIGNED
           | LM90_HAVE_REMOTE_EXT | LM90_HAVE_FAULTQUEUE,
         .alert_alarms = 0x50,
         .resolution = 10,
         .reg_local_ext = MAX6657_REG_LOCAL_TEMPL,
         .faultqueue_mask = BIT(4),
         .faultqueue_depth = 2,
     },
     [max6646] = {
         .flags = LM90_HAVE_CRIT | LM90_HAVE_BROKEN_ALERT
           | LM90_HAVE_EXT_UNSIGNED | LM90_HAVE_ALARMS | LM90_HAVE_LOW
           | LM90_HAVE_CONVRATE | LM90_HAVE_REMOTE_EXT,
         .alert_alarms = 0x7c,
         .max_convrate = 6,
         .reg_local_ext = MAX6657_REG_LOCAL_TEMPL,
     },
     [max6648] = {
         .flags = LM90_HAVE_UNSIGNED_TEMP | LM90_HAVE_CRIT
           | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_LOW
           | LM90_HAVE_CONVRATE | LM90_HAVE_REMOTE_EXT,
         .alert_alarms = 0x7c,
         .max_convrate = 6,
         .reg_local_ext = MAX6657_REG_LOCAL_TEMPL,
     },
     [max6654] = {
         .flags = LM90_HAVE_BROKEN_ALERT | LM90_HAVE_ALARMS | LM90_HAVE_LOW
           | LM90_HAVE_CONVRATE | LM90_HAVE_REMOTE_EXT,
         .alert_alarms = 0x7c,
         .max_convrate = 7,
         .reg_local_ext = MAX6657_REG_LOCAL_TEMPL,
     },
     [max6657] = {
         .flags = LM90_PAUSE_FOR_CONFIG | LM90_HAVE_CRIT
           | LM90_HAVE_ALARMS | LM90_HAVE_LOW | LM90_HAVE_CONVRATE
           | LM90_HAVE_REMOTE_EXT,
         .alert_alarms = 0x7c,
         .max_convrate = 8,
         .reg_local_ext = MAX6657_REG_LOCAL_TEMPL,
     },
     [max6659] = {
         .flags = LM90_HAVE_EMERGENCY | LM90_HAVE_CRIT
           | LM90_HAVE_ALARMS | LM90_HAVE_LOW | LM90_HAVE_CONVRATE
           | LM90_HAVE_REMOTE_EXT,
         .alert_alarms = 0x7c,
         .max_convrate = 8,
         .reg_local_ext = MAX6657_REG_LOCAL_TEMPL,
     },
     [max6680] = {
         /*
          * Apparent temperatures of 128 degrees C or higher are reported
          * and treated as negative temperatures (meaning min_alarm will
          * be set).
          */
         .flags = LM90_HAVE_OFFSET | LM90_HAVE_CRIT
           | LM90_HAVE_CRIT_ALRM_SWP | LM90_HAVE_BROKEN_ALERT
           | LM90_HAVE_ALARMS | LM90_HAVE_LOW | LM90_HAVE_CONVRATE
           | LM90_HAVE_REMOTE_EXT,
         .alert_alarms = 0x7c,
         .max_convrate = 7,
     },
     [max6696] = {
         .flags = LM90_HAVE_EMERGENCY
           | LM90_HAVE_EMERGENCY_ALARM | LM90_HAVE_TEMP3 | LM90_HAVE_CRIT
           | LM90_HAVE_ALARMS | LM90_HAVE_LOW | LM90_HAVE_CONVRATE
           | LM90_HAVE_REMOTE_EXT | LM90_HAVE_FAULTQUEUE,
         .alert_alarms = 0x1c7c,
         .max_convrate = 6,
         .reg_status2 = MAX6696_REG_STATUS2,
         .reg_local_ext = MAX6657_REG_LOCAL_TEMPL,
         .faultqueue_mask = BIT(5),
         .faultqueue_depth = 4,
     },
     [nct72] = {
         .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
           | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXTENDED_TEMP
           | LM90_HAVE_CRIT | LM90_HAVE_PEC | LM90_HAVE_UNSIGNED_TEMP
           | LM90_HAVE_LOW | LM90_HAVE_CONVRATE | LM90_HAVE_REMOTE_EXT
           | LM90_HAVE_FAULTQUEUE,
         .alert_alarms = 0x7c,
         .max_convrate = 10,
         .resolution = 10,
     },
     [nct210] = {
         .flags = LM90_HAVE_ALARMS | LM90_HAVE_BROKEN_ALERT
           | LM90_HAVE_REM_LIMIT_EXT | LM90_HAVE_LOW | LM90_HAVE_CONVRATE
           | LM90_HAVE_REMOTE_EXT,
         .alert_alarms = 0x7c,
         .resolution = 11,
         .max_convrate = 7,
     },
     [ne1618] = {
         .flags = LM90_PAUSE_FOR_CONFIG | LM90_HAVE_BROKEN_ALERT
           | LM90_HAVE_LOW | LM90_HAVE_CONVRATE | LM90_HAVE_REMOTE_EXT,
         .alert_alarms = 0x7c,
         .resolution = 11,
         .max_convrate = 7,
     },
     [w83l771] = {
         .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT | LM90_HAVE_CRIT
           | LM90_HAVE_ALARMS | LM90_HAVE_LOW | LM90_HAVE_CONVRATE
           | LM90_HAVE_REMOTE_EXT,
         .alert_alarms = 0x7c,
         .max_convrate = 8,
     },
     [sa56004] = {
         /*
          * Apparent temperatures of 128 degrees C or higher are reported
          * and treated as negative temperatures (meaning min_alarm will
          * be set).
          */
         .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT | LM90_HAVE_CRIT
           | LM90_HAVE_ALARMS | LM90_HAVE_LOW | LM90_HAVE_CONVRATE
           | LM90_HAVE_REMOTE_EXT | LM90_HAVE_FAULTQUEUE,
         .alert_alarms = 0x7b,
         .max_convrate = 9,
         .reg_local_ext = SA56004_REG_LOCAL_TEMPL,
         .faultqueue_mask = BIT(0),
         .faultqueue_depth = 3,
     },
     [tmp451] = {
         .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
           | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXTENDED_TEMP | LM90_HAVE_CRIT
           | LM90_HAVE_UNSIGNED_TEMP | LM90_HAVE_ALARMS | LM90_HAVE_LOW
           | LM90_HAVE_CONVRATE | LM90_HAVE_REMOTE_EXT | LM90_HAVE_FAULTQUEUE,
         .alert_alarms = 0x7c,
         .max_convrate = 9,
         .resolution = 12,
         .reg_local_ext = TMP451_REG_LOCAL_TEMPL,
     },
     [tmp461] = {
         .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
           | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXTENDED_TEMP | LM90_HAVE_CRIT
           | LM90_HAVE_ALARMS | LM90_HAVE_LOW | LM90_HAVE_CONVRATE
           | LM90_HAVE_REMOTE_EXT | LM90_HAVE_FAULTQUEUE,
         .alert_alarms = 0x7c,
         .max_convrate = 9,
         .resolution = 12,
         .reg_local_ext = TMP451_REG_LOCAL_TEMPL,
     },
 };
 
 /*
  * temperature register index
  */
 enum lm90_temp_reg_index {
     LOCAL_LOW = 0,
     LOCAL_HIGH,
     LOCAL_CRIT,
     REMOTE_CRIT,
     LOCAL_EMERG,    /* max6659 and max6695/96 */
     REMOTE_EMERG,   /* max6659 and max6695/96 */
     REMOTE2_CRIT,   /* max6695/96 only */
     REMOTE2_EMERG,  /* max6695/96 only */
 
     REMOTE_TEMP,
     REMOTE_LOW,
     REMOTE_HIGH,
     REMOTE_OFFSET,  /* except max6646, max6657/58/59, and max6695/96 */
     LOCAL_TEMP,
     REMOTE2_TEMP,   /* max6695/96 only */
     REMOTE2_LOW,    /* max6695/96 only */
     REMOTE2_HIGH,   /* max6695/96 only */
     REMOTE2_OFFSET,
 
     TEMP_REG_NUM
 };
 
 /*
  * Client data (each client gets its own)
  */
 
 struct lm90_data {
     struct i2c_client *client;
     struct device *hwmon_dev;
     u32 chip_config[2];
     u32 channel_config[MAX_CHANNELS + 1];
     const char *channel_label[MAX_CHANNELS];
     struct hwmon_channel_info chip_info;
     struct hwmon_channel_info temp_info;
     const struct hwmon_channel_info *info[3];
     struct hwmon_chip_info chip;
     struct mutex update_lock;
     struct delayed_work alert_work;
     struct work_struct report_work;
     bool valid;     /* true if register values are valid */
     bool alarms_valid;  /* true if status register values are valid */
     unsigned long last_updated; /* in jiffies */
     unsigned long alarms_updated; /* in jiffies */
     int kind;
     u32 flags;
 
     unsigned int update_interval; /* in milliseconds */
 
     u8 config;      /* Current configuration register value */
     u8 config_orig;     /* Original configuration register value */
     u8 convrate_orig;   /* Original conversion rate register value */
     u8 resolution;      /* temperature resolution in bit */
     u16 alert_alarms;   /* Which alarm bits trigger ALERT# */
                 /* Upper 8 bits for max6695/96 */
     u8 max_convrate;    /* Maximum conversion rate */
     u8 reg_status2;     /* 2nd status register (optional) */
     u8 reg_local_ext;   /* local extension register offset */
     u8 reg_remote_ext;  /* remote temperature low byte */
     u8 faultqueue_mask; /* fault queue mask */
     u8 faultqueue_depth;    /* fault queue mask */
 
     /* registers values */
     u16 temp[TEMP_REG_NUM];
     u8 temp_hyst;
     u8 conalert;
     u16 reported_alarms;    /* alarms reported as sysfs/udev events */
     u16 current_alarms; /* current alarms, reported by chip */
     u16 alarms;     /* alarms not yet reported to user */
 };
 
 /*
  * Support functions
  */
 
 /*
  * If the chip supports PEC but not on write byte transactions, we need
  * to explicitly ask for a transaction without PEC.
  */
 static inline s32 lm90_write_no_pec(struct i2c_client *client, u8 value)
 {
     return i2c_smbus_xfer(client->adapter, client->addr,
                   client->flags & ~I2C_CLIENT_PEC,
                   I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
 }
 
 /*
  * It is assumed that client->update_lock is held (unless we are in
  * detection or initialization steps). This matters when PEC is enabled
  * for chips with partial PEC support, because we don't want the address
  * pointer to change between the write byte and the read byte transactions.
  */
 static int lm90_read_reg(struct i2c_client *client, u8 reg)
 {
     struct lm90_data *data = i2c_get_clientdata(client);
     bool partial_pec = (client->flags & I2C_CLIENT_PEC) &&
             (data->flags & LM90_HAVE_PARTIAL_PEC);
     int err;
 
     if (partial_pec) {
         err = lm90_write_no_pec(client, reg);
         if (err)
             return err;
         return i2c_smbus_read_byte(client);
     }
     return i2c_smbus_read_byte_data(client, reg);
 }
 
 /*
  * Return register write address
  *
  * The write address for registers 0x03 .. 0x08 is the read address plus 6.
  * For other registers the write address matches the read address.
  */
 static u8 lm90_write_reg_addr(u8 reg)
 {
     if (reg >= LM90_REG_CONFIG1 && reg <= LM90_REG_REMOTE_LOWH)
         return reg + 6;
     return reg;
 }
 
 /*
  * Write into LM90 register.
  * Convert register address to write address if needed, then execute the
  * operation.
  */
 static int lm90_write_reg(struct i2c_client *client, u8 reg, u8 val)
 {
     return i2c_smbus_write_byte_data(client, lm90_write_reg_addr(reg), val);
 }
 
 /*
  * Write into 16-bit LM90 register.
  * Convert register addresses to write address if needed, then execute the
  * operation.
  */
 static int lm90_write16(struct i2c_client *client, u8 regh, u8 regl, u16 val)
 {
     int ret;
 
     ret = lm90_write_reg(client, regh, val >> 8);
     if (ret < 0 || !regl)
         return ret;
     return lm90_write_reg(client, regl, val & 0xff);
 }
 
 static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl,
                bool is_volatile)
 {
     int oldh, newh, l;
 
     oldh = lm90_read_reg(client, regh);
     if (oldh < 0)
         return oldh;
 
     if (!regl)
         return oldh << 8;
 
     l = lm90_read_reg(client, regl);
     if (l < 0)
         return l;
 
     if (!is_volatile)
         return (oldh << 8) | l;
 
     /*
      * For volatile registers we have to use a trick.
      * We have to read two registers to have the sensor temperature,
      * but we have to beware a conversion could occur between the
      * readings. The datasheet says we should either use
      * the one-shot conversion register, which we don't want to do
      * (disables hardware monitoring) or monitor the busy bit, which is
      * impossible (we can't read the values and monitor that bit at the
      * exact same time). So the solution used here is to read the high
      * the high byte again. If the new high byte matches the old one,
      * then we have a valid reading. Otherwise we have to read the low
      * byte again, and now we believe we have a correct reading.
      */
     newh = lm90_read_reg(client, regh);
     if (newh < 0)
         return newh;
     if (oldh != newh) {
         l = lm90_read_reg(client, regl);
         if (l < 0)
             return l;
     }
     return (newh << 8) | l;
 }
 
 static int lm90_update_confreg(struct lm90_data *data, u8 config)
 {
     if (data->config != config) {
         int err;
 
         err = lm90_write_reg(data->client, LM90_REG_CONFIG1, config);
         if (err)
             return err;
         data->config = config;
     }
     return 0;
 }
 
 /*
  * client->update_lock must be held when calling this function (unless we are
  * in detection or initialization steps), and while a remote channel other
  * than channel 0 is selected. Also, calling code must make sure to re-select
  * external channel 0 before releasing the lock. This is necessary because
  * various registers have different meanings as a result of selecting a
  * non-default remote channel.
  */
 static int lm90_select_remote_channel(struct lm90_data *data, bool second)
 {
     u8 config = data->config & ~0x08;
 
     if (second)
         config |= 0x08;
 
     return lm90_update_confreg(data, config);
 }
 
 static int lm90_write_convrate(struct lm90_data *data, int val)
 {
     u8 config = data->config;
     int err;
 
     /* Save config and pause conversion */
     if (data->flags & LM90_PAUSE_FOR_CONFIG) {
         err = lm90_update_confreg(data, config | 0x40);
         if (err < 0)
             return err;
     }
 
     /* Set conv rate */
     err = lm90_write_reg(data->client, LM90_REG_CONVRATE, val);
 
     /* Revert change to config */
     lm90_update_confreg(data, config);
 
     return err;
 }
 
 /*
  * Set conversion rate.
  * client->update_lock must be held when calling this function (unless we are
  * in detection or initialization steps).
  */
 static int lm90_set_convrate(struct i2c_client *client, struct lm90_data *data,
                  unsigned int interval)
 {
     unsigned int update_interval;
     int i, err;
 
     /* Shift calculations to avoid rounding errors */
     interval <<= 6;
 
     /* find the nearest update rate */
     for (i = 0, update_interval = LM90_MAX_CONVRATE_MS << 6;
          i < data->max_convrate; i++, update_interval >>= 1)
         if (interval >= update_interval * 3 / 4)
             break;
 
     err = lm90_write_convrate(data, i);
     data->update_interval = DIV_ROUND_CLOSEST(update_interval, 64);
     return err;
 }
 
 static int lm90_set_faultqueue(struct i2c_client *client,
                    struct lm90_data *data, int val)
 {
     int err;
 
     if (data->faultqueue_mask) {
         err = lm90_update_confreg(data, val <= data->faultqueue_depth / 2 ?
                       data->config & ~data->faultqueue_mask :
                       data->config | data->faultqueue_mask);
     } else {
         static const u8 values[4] = {0, 2, 6, 0x0e};
 
         data->conalert = (data->conalert & 0xf1) | values[val - 1];
         err = lm90_write_reg(data->client, TMP451_REG_CONALERT,
                      data->conalert);
     }
 
     return err;
 }
 
 static int lm90_update_limits(struct device *dev)
 {
     struct lm90_data *data = dev_get_drvdata(dev);
     struct i2c_client *client = data->client;
     int val;
 
     if (data->flags & LM90_HAVE_CRIT) {
         val = lm90_read_reg(client, LM90_REG_LOCAL_CRIT);
         if (val < 0)
             return val;
         data->temp[LOCAL_CRIT] = val << 8;
 
         val = lm90_read_reg(client, LM90_REG_REMOTE_CRIT);
         if (val < 0)
             return val;
         data->temp[REMOTE_CRIT] = val << 8;
 
         val = lm90_read_reg(client, LM90_REG_TCRIT_HYST);
         if (val < 0)
             return val;
         data->temp_hyst = val;
     }
     if ((data->flags & LM90_HAVE_FAULTQUEUE) && !data->faultqueue_mask) {
         val = lm90_read_reg(client, TMP451_REG_CONALERT);
         if (val < 0)
             return val;
         data->conalert = val;
     }
 
     val = lm90_read16(client, LM90_REG_REMOTE_LOWH,
               (data->flags & LM90_HAVE_REM_LIMIT_EXT) ? LM90_REG_REMOTE_LOWL : 0,
               false);
     if (val < 0)
         return val;
     data->temp[REMOTE_LOW] = val;
 
     val = lm90_read16(client, LM90_REG_REMOTE_HIGHH,
               (data->flags & LM90_HAVE_REM_LIMIT_EXT) ? LM90_REG_REMOTE_HIGHL : 0,
               false);
     if (val < 0)
         return val;
     data->temp[REMOTE_HIGH] = val;
 
     if (data->flags & LM90_HAVE_OFFSET) {
         val = lm90_read16(client, LM90_REG_REMOTE_OFFSH,
                   LM90_REG_REMOTE_OFFSL, false);
         if (val < 0)
             return val;
         data->temp[REMOTE_OFFSET] = val;
     }
 
     if (data->flags & LM90_HAVE_EMERGENCY) {
         val = lm90_read_reg(client, MAX6659_REG_LOCAL_EMERG);
         if (val < 0)
             return val;
         data->temp[LOCAL_EMERG] = val << 8;
 
         val = lm90_read_reg(client, MAX6659_REG_REMOTE_EMERG);
         if (val < 0)
             return val;
         data->temp[REMOTE_EMERG] = val << 8;
     }
 
     if (data->flags & LM90_HAVE_TEMP3) {
         val = lm90_select_remote_channel(data, true);
         if (val < 0)
             return val;
 
         val = lm90_read_reg(client, LM90_REG_REMOTE_CRIT);
         if (val < 0)
             return val;
         data->temp[REMOTE2_CRIT] = val << 8;
 
         if (data->flags & LM90_HAVE_EMERGENCY) {
             val = lm90_read_reg(client, MAX6659_REG_REMOTE_EMERG);
             if (val < 0)
                 return val;
             data->temp[REMOTE2_EMERG] = val << 8;
         }
 
         val = lm90_read_reg(client, LM90_REG_REMOTE_LOWH);
         if (val < 0)
             return val;
         data->temp[REMOTE2_LOW] = val << 8;
 
         val = lm90_read_reg(client, LM90_REG_REMOTE_HIGHH);
         if (val < 0)
             return val;
         data->temp[REMOTE2_HIGH] = val << 8;
 
         if (data->flags & LM90_HAVE_OFFSET) {
             val = lm90_read16(client, LM90_REG_REMOTE_OFFSH,
                       LM90_REG_REMOTE_OFFSL, false);
             if (val < 0)
                 return val;
             data->temp[REMOTE2_OFFSET] = val;
         }
 
         lm90_select_remote_channel(data, false);
     }
 
     return 0;
 }
 
 static void lm90_report_alarms(struct work_struct *work)
 {
     struct lm90_data *data = container_of(work, struct lm90_data, report_work);
     u16 cleared_alarms, new_alarms, current_alarms;
     struct device *hwmon_dev = data->hwmon_dev;
     struct device *dev = &data->client->dev;
     int st, st2;
 
     current_alarms = data->current_alarms;
     cleared_alarms = data->reported_alarms & ~current_alarms;
     new_alarms = current_alarms & ~data->reported_alarms;
 
     if (!cleared_alarms && !new_alarms)
         return;
 
     st = new_alarms & 0xff;
     st2 = new_alarms >> 8;
 
     if ((st & (LM90_STATUS_LLOW | LM90_STATUS_LHIGH | LM90_STATUS_LTHRM)) ||
         (st2 & MAX6696_STATUS2_LOT2))
         dev_dbg(dev, "temp%d out of range, please check!\n", 1);
     if ((st & (LM90_STATUS_RLOW | LM90_STATUS_RHIGH | LM90_STATUS_RTHRM)) ||
         (st2 & MAX6696_STATUS2_ROT2))
         dev_dbg(dev, "temp%d out of range, please check!\n", 2);
     if (st & LM90_STATUS_ROPEN)
         dev_dbg(dev, "temp%d diode open, please check!\n", 2);
     if (st2 & (MAX6696_STATUS2_R2LOW | MAX6696_STATUS2_R2HIGH |
            MAX6696_STATUS2_R2THRM | MAX6696_STATUS2_R2OT2))
         dev_dbg(dev, "temp%d out of range, please check!\n", 3);
     if (st2 & MAX6696_STATUS2_R2OPEN)
         dev_dbg(dev, "temp%d diode open, please check!\n", 3);
 
     st |= cleared_alarms & 0xff;
     st2 |= cleared_alarms >> 8;
 
     if (st & LM90_STATUS_LLOW)
         hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_min_alarm, 0);
     if (st & LM90_STATUS_RLOW)
         hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_min_alarm, 1);
     if (st2 & MAX6696_STATUS2_R2LOW)
         hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_min_alarm, 2);
 
     if (st & LM90_STATUS_LHIGH)
         hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_max_alarm, 0);
     if (st & LM90_STATUS_RHIGH)
         hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_max_alarm, 1);
     if (st2 & MAX6696_STATUS2_R2HIGH)
         hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_max_alarm, 2);
 
     if (st & LM90_STATUS_LTHRM)
         hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_crit_alarm, 0);
     if (st & LM90_STATUS_RTHRM)
         hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_crit_alarm, 1);
     if (st2 & MAX6696_STATUS2_R2THRM)
         hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_crit_alarm, 2);
 
     if (st2 & MAX6696_STATUS2_LOT2)
         hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_emergency_alarm, 0);
     if (st2 & MAX6696_STATUS2_ROT2)
         hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_emergency_alarm, 1);
     if (st2 & MAX6696_STATUS2_R2OT2)
         hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_emergency_alarm, 2);
 
     data->reported_alarms = current_alarms;
 }
 
 static int lm90_update_alarms_locked(struct lm90_data *data, bool force)
 {
     if (force || !data->alarms_valid ||
         time_after(jiffies, data->alarms_updated + msecs_to_jiffies(data->update_interval))) {
         struct i2c_client *client = data->client;
         bool check_enable;
         u16 alarms;
         int val;
 
         data->alarms_valid = false;
 
         val = lm90_read_reg(client, LM90_REG_STATUS);
         if (val < 0)
             return val;
         alarms = val & ~LM90_STATUS_BUSY;
 
         if (data->reg_status2) {
             val = lm90_read_reg(client, data->reg_status2);
             if (val < 0)
                 return val;
             alarms |= val << 8;
         }
         /*
          * If the update is forced (called from interrupt or alert
          * handler) and alarm data is valid, the alarms may have been
          * updated after the last update interval, and the status
          * register may still be cleared. Only add additional alarms
          * in this case. Alarms will be cleared later if appropriate.
          */
         if (force && data->alarms_valid)
             data->current_alarms |= alarms;
         else
             data->current_alarms = alarms;
         data->alarms |= alarms;
 
         check_enable = (client->irq || !(data->config_orig & 0x80)) &&
             (data->config & 0x80);
 
         if (force || check_enable)
             schedule_work(&data->report_work);
 
         /*
          * Re-enable ALERT# output if it was originally enabled, relevant
          * alarms are all clear, and alerts are currently disabled.
          * Otherwise (re)schedule worker if needed.
          */
         if (check_enable) {
             if (!(data->current_alarms & data->alert_alarms)) {
                 dev_dbg(&client->dev, "Re-enabling ALERT#\n");
                 lm90_update_confreg(data, data->config & ~0x80);
                 /*
                  * We may have been called from the update handler.
                  * If so, the worker, if scheduled, is no longer
                  * needed. Cancel it. Don't synchronize because
                  * it may already be running.
                  */
                 cancel_delayed_work(&data->alert_work);
             } else {
                 schedule_delayed_work(&data->alert_work,
                     max_t(int, HZ, msecs_to_jiffies(data->update_interval)));
             }
         }
         data->alarms_updated = jiffies;
         data->alarms_valid = true;
     }
     return 0;
 }
 
 static int lm90_update_alarms(struct lm90_data *data, bool force)
 {
     int err;
 
     mutex_lock(&data->update_lock);
     err = lm90_update_alarms_locked(data, force);
     mutex_unlock(&data->update_lock);
 
     return err;
 }
 
 static void lm90_alert_work(struct work_struct *__work)
 {
     struct delayed_work *delayed_work = container_of(__work, struct delayed_work, work);
     struct lm90_data *data = container_of(delayed_work, struct lm90_data, alert_work);
 
     /* Nothing to do if alerts are enabled */
     if (!(data->config & 0x80))
         return;
 
     lm90_update_alarms(data, true);
 }
 
 static int lm90_update_device(struct device *dev)
 {
     struct lm90_data *data = dev_get_drvdata(dev);
     struct i2c_client *client = data->client;
     unsigned long next_update;
     int val;
 
     if (!data->valid) {
         val = lm90_update_limits(dev);
         if (val < 0)
             return val;
     }
 
     next_update = data->last_updated +
               msecs_to_jiffies(data->update_interval);
     if (time_after(jiffies, next_update) || !data->valid) {
         dev_dbg(&client->dev, "Updating lm90 data.\n");
 
         data->valid = false;
 
         val = lm90_read_reg(client, LM90_REG_LOCAL_LOW);
         if (val < 0)
             return val;
         data->temp[LOCAL_LOW] = val << 8;
 
         val = lm90_read_reg(client, LM90_REG_LOCAL_HIGH);
         if (val < 0)
             return val;
         data->temp[LOCAL_HIGH] = val << 8;
 
         val = lm90_read16(client, LM90_REG_LOCAL_TEMP,
                   data->reg_local_ext, true);
         if (val < 0)
             return val;
         data->temp[LOCAL_TEMP] = val;
         val = lm90_read16(client, LM90_REG_REMOTE_TEMPH,
                   data->reg_remote_ext, true);
         if (val < 0)
             return val;
         data->temp[REMOTE_TEMP] = val;
 
         if (data->flags & LM90_HAVE_TEMP3) {
             val = lm90_select_remote_channel(data, true);
             if (val < 0)
                 return val;
 
             val = lm90_read16(client, LM90_REG_REMOTE_TEMPH,
                       data->reg_remote_ext, true);
             if (val < 0) {
                 lm90_select_remote_channel(data, false);
                 return val;
             }
             data->temp[REMOTE2_TEMP] = val;
 
             lm90_select_remote_channel(data, false);
         }
 
         val = lm90_update_alarms_locked(data, false);
         if (val < 0)
             return val;
 
         data->last_updated = jiffies;
         data->valid = true;
     }
 
     return 0;
 }
 
 /* pec used for devices with PEC support */
 static ssize_t pec_show(struct device *dev, struct device_attribute *dummy,
             char *buf)
 {
     struct i2c_client *client = to_i2c_client(dev);
 
     return sprintf(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);
     long val;
     int err;
 
     err = kstrtol(buf, 10, &val);
     if (err < 0)
         return err;
 
     switch (val) {
     case 0:
         client->flags &= ~I2C_CLIENT_PEC;
         break;
     case 1:
         client->flags |= I2C_CLIENT_PEC;
         break;
     default:
         return -EINVAL;
     }
 
     return count;
 }
 
 static DEVICE_ATTR_RW(pec);
 
 static int lm90_temp_get_resolution(struct lm90_data *data, int index)
 {
     switch (index) {
     case REMOTE_TEMP:
         if (data->reg_remote_ext)
             return data->resolution;
         return 8;
     case REMOTE_OFFSET:
     case REMOTE2_OFFSET:
     case REMOTE2_TEMP:
         return data->resolution;
     case LOCAL_TEMP:
         if (data->reg_local_ext)
             return data->resolution;
         return 8;
     case REMOTE_LOW:
     case REMOTE_HIGH:
     case REMOTE2_LOW:
     case REMOTE2_HIGH:
         if (data->flags & LM90_HAVE_REM_LIMIT_EXT)
             return data->resolution;
         return 8;
     default:
         return 8;
     }
 }
 
 static int lm90_temp_from_reg(u32 flags, u16 regval, u8 resolution)
 {
     int val;
 
     if (flags & LM90_HAVE_EXTENDED_TEMP)
         val = regval - 0x4000;
     else if (flags & (LM90_HAVE_UNSIGNED_TEMP | LM90_HAVE_EXT_UNSIGNED))
         val = regval;
     else
         val = (s16)regval;
 
     return ((val >> (16 - resolution)) * 1000) >> (resolution - 8);
 }
 
 static int lm90_get_temp(struct lm90_data *data, int index, int channel)
 {
     int temp = lm90_temp_from_reg(data->flags, data->temp[index],
                       lm90_temp_get_resolution(data, index));
 
     /* +16 degrees offset for remote temperature on LM99 */
     if (data->kind == lm99 && channel)
         temp += 16000;
 
     return temp;
 }
 
 static u16 lm90_temp_to_reg(u32 flags, long val, u8 resolution)
 {
     int fraction = resolution > 8 ?
             1000 - DIV_ROUND_CLOSEST(1000, BIT(resolution - 8)) : 0;
 
     if (flags & LM90_HAVE_EXTENDED_TEMP) {
         val = clamp_val(val, -64000, 191000 + fraction);
         val += 64000;
     } else if (flags & LM90_HAVE_EXT_UNSIGNED) {
         val = clamp_val(val, 0, 255000 + fraction);
     } else if (flags & LM90_HAVE_UNSIGNED_TEMP) {
         val = clamp_val(val, 0, 127000 + fraction);
     } else {
         val = clamp_val(val, -128000, 127000 + fraction);
     }
 
     return DIV_ROUND_CLOSEST(val << (resolution - 8), 1000) << (16 - resolution);
 }
 
 static int lm90_set_temp(struct lm90_data *data, int index, int channel, long val)
 {
     static const u8 regs[] = {
         [LOCAL_LOW] = LM90_REG_LOCAL_LOW,
         [LOCAL_HIGH] = LM90_REG_LOCAL_HIGH,
         [LOCAL_CRIT] = LM90_REG_LOCAL_CRIT,
         [REMOTE_CRIT] = LM90_REG_REMOTE_CRIT,
         [LOCAL_EMERG] = MAX6659_REG_LOCAL_EMERG,
         [REMOTE_EMERG] = MAX6659_REG_REMOTE_EMERG,
         [REMOTE2_CRIT] = LM90_REG_REMOTE_CRIT,
         [REMOTE2_EMERG] = MAX6659_REG_REMOTE_EMERG,
         [REMOTE_LOW] = LM90_REG_REMOTE_LOWH,
         [REMOTE_HIGH] = LM90_REG_REMOTE_HIGHH,
         [REMOTE2_LOW] = LM90_REG_REMOTE_LOWH,
         [REMOTE2_HIGH] = LM90_REG_REMOTE_HIGHH,
     };
     struct i2c_client *client = data->client;
     u8 regh = regs[index];
     u8 regl = 0;
     int err;
 
     if (channel && (data->flags & LM90_HAVE_REM_LIMIT_EXT)) {
         if (index == REMOTE_LOW || index == REMOTE2_LOW)
             regl = LM90_REG_REMOTE_LOWL;
         else if (index == REMOTE_HIGH || index == REMOTE2_HIGH)
             regl = LM90_REG_REMOTE_HIGHL;
     }
 
     /* +16 degrees offset for remote temperature on LM99 */
     if (data->kind == lm99 && channel) {
         /* prevent integer underflow */
         val = max(val, -128000l);
         val -= 16000;
     }
 
     data->temp[index] = lm90_temp_to_reg(data->flags, val,
                          lm90_temp_get_resolution(data, index));
 
     if (channel > 1)
         lm90_select_remote_channel(data, true);
 
     err = lm90_write16(client, regh, regl, data->temp[index]);
 
     if (channel > 1)
         lm90_select_remote_channel(data, false);
 
     return err;
 }
 
 static int lm90_get_temphyst(struct lm90_data *data, int index, int channel)
 {
     int temp = lm90_get_temp(data, index, channel);
 
     return temp - data->temp_hyst * 1000;
 }
 
 static int lm90_set_temphyst(struct lm90_data *data, long val)
 {
     int temp = lm90_get_temp(data, LOCAL_CRIT, 0);
 
     /* prevent integer overflow/underflow */
     val = clamp_val(val, -128000l, 255000l);
     data->temp_hyst = clamp_val(DIV_ROUND_CLOSEST(temp - val, 1000), 0, 31);
 
     return lm90_write_reg(data->client, LM90_REG_TCRIT_HYST, data->temp_hyst);
 }
 
 static int lm90_get_temp_offset(struct lm90_data *data, int index)
 {
     int res = lm90_temp_get_resolution(data, index);
 
     return lm90_temp_from_reg(0, data->temp[index], res);
 }
 
 static int lm90_set_temp_offset(struct lm90_data *data, int index, int channel, long val)
 {
     int err;
 
     val = lm90_temp_to_reg(0, val, lm90_temp_get_resolution(data, index));
 
     /* For ADT7481 we can use the same registers for remote channel 1 and 2 */
     if (channel > 1)
         lm90_select_remote_channel(data, true);
 
     err = lm90_write16(data->client, LM90_REG_REMOTE_OFFSH, LM90_REG_REMOTE_OFFSL, val);
 
     if (channel > 1)
         lm90_select_remote_channel(data, false);
 
     if (err)
         return err;
 
     data->temp[index] = val;
 
     return 0;
 }
 
 static const u8 lm90_temp_index[MAX_CHANNELS] = {
     LOCAL_TEMP, REMOTE_TEMP, REMOTE2_TEMP
 };
 
 static const u8 lm90_temp_min_index[MAX_CHANNELS] = {
     LOCAL_LOW, REMOTE_LOW, REMOTE2_LOW
 };
 
 static const u8 lm90_temp_max_index[MAX_CHANNELS] = {
     LOCAL_HIGH, REMOTE_HIGH, REMOTE2_HIGH
 };
 
 static const u8 lm90_temp_crit_index[MAX_CHANNELS] = {
     LOCAL_CRIT, REMOTE_CRIT, REMOTE2_CRIT
 };
 
 static const u8 lm90_temp_emerg_index[MAX_CHANNELS] = {
     LOCAL_EMERG, REMOTE_EMERG, REMOTE2_EMERG
 };
 
 static const s8 lm90_temp_offset_index[MAX_CHANNELS] = {
     -1, REMOTE_OFFSET, REMOTE2_OFFSET
 };
 
 static const u16 lm90_min_alarm_bits[MAX_CHANNELS] = { BIT(5), BIT(3), BIT(11) };
 static const u16 lm90_max_alarm_bits[MAX_CHANNELS] = { BIT(6), BIT(4), BIT(12) };
 static const u16 lm90_crit_alarm_bits[MAX_CHANNELS] = { BIT(0), BIT(1), BIT(9) };
 static const u16 lm90_crit_alarm_bits_swapped[MAX_CHANNELS] = { BIT(1), BIT(0), BIT(9) };
 static const u16 lm90_emergency_alarm_bits[MAX_CHANNELS] = { BIT(15), BIT(13), BIT(14) };
 static const u16 lm90_fault_bits[MAX_CHANNELS] = { BIT(0), BIT(2), BIT(10) };
 
 static int lm90_temp_read(struct device *dev, u32 attr, int channel, long *val)
 {
     struct lm90_data *data = dev_get_drvdata(dev);
     int err;
     u16 bit;
 
     mutex_lock(&data->update_lock);
     err = lm90_update_device(dev);
     mutex_unlock(&data->update_lock);
     if (err)
         return err;
 
     switch (attr) {
     case hwmon_temp_input:
         *val = lm90_get_temp(data, lm90_temp_index[channel], channel);
         break;
     case hwmon_temp_min_alarm:
     case hwmon_temp_max_alarm:
     case hwmon_temp_crit_alarm:
     case hwmon_temp_emergency_alarm:
     case hwmon_temp_fault:
         switch (attr) {
         case hwmon_temp_min_alarm:
             bit = lm90_min_alarm_bits[channel];
             break;
         case hwmon_temp_max_alarm:
             bit = lm90_max_alarm_bits[channel];
             break;
         case hwmon_temp_crit_alarm:
             if (data->flags & LM90_HAVE_CRIT_ALRM_SWP)
                 bit = lm90_crit_alarm_bits_swapped[channel];
             else
                 bit = lm90_crit_alarm_bits[channel];
             break;
         case hwmon_temp_emergency_alarm:
             bit = lm90_emergency_alarm_bits[channel];
             break;
         case hwmon_temp_fault:
             bit = lm90_fault_bits[channel];
             break;
         }
         *val = !!(data->alarms & bit);
         data->alarms &= ~bit;
         data->alarms |= data->current_alarms;
         break;
     case hwmon_temp_min:
         *val = lm90_get_temp(data, lm90_temp_min_index[channel], channel);
         break;
     case hwmon_temp_max:
         *val = lm90_get_temp(data, lm90_temp_max_index[channel], channel);
         break;
     case hwmon_temp_crit:
         *val = lm90_get_temp(data, lm90_temp_crit_index[channel], channel);
         break;
     case hwmon_temp_crit_hyst:
         *val = lm90_get_temphyst(data, lm90_temp_crit_index[channel], channel);
         break;
     case hwmon_temp_emergency:
         *val = lm90_get_temp(data, lm90_temp_emerg_index[channel], channel);
         break;
     case hwmon_temp_emergency_hyst:
         *val = lm90_get_temphyst(data, lm90_temp_emerg_index[channel], channel);
         break;
     case hwmon_temp_offset:
         *val = lm90_get_temp_offset(data, lm90_temp_offset_index[channel]);
         break;
     default:
         return -EOPNOTSUPP;
     }
     return 0;
 }
 
 static int lm90_temp_write(struct device *dev, u32 attr, int channel, long val)
 {
     struct lm90_data *data = dev_get_drvdata(dev);
     int err;
 
     mutex_lock(&data->update_lock);
 
     err = lm90_update_device(dev);
     if (err)
         goto error;
 
     switch (attr) {
     case hwmon_temp_min:
         err = lm90_set_temp(data, lm90_temp_min_index[channel],
                     channel, val);
         break;
     case hwmon_temp_max:
         err = lm90_set_temp(data, lm90_temp_max_index[channel],
                     channel, val);
         break;
     case hwmon_temp_crit:
         err = lm90_set_temp(data, lm90_temp_crit_index[channel],
                     channel, val);
         break;
     case hwmon_temp_crit_hyst:
         err = lm90_set_temphyst(data, val);
         break;
     case hwmon_temp_emergency:
         err = lm90_set_temp(data, lm90_temp_emerg_index[channel],
                     channel, val);
         break;
     case hwmon_temp_offset:
         err = lm90_set_temp_offset(data, lm90_temp_offset_index[channel],
                        channel, val);
         break;
     default:
         err = -EOPNOTSUPP;
         break;
     }
 error:
     mutex_unlock(&data->update_lock);
 
     return err;
 }
 
 static umode_t lm90_temp_is_visible(const void *data, u32 attr, int channel)
 {
     switch (attr) {
     case hwmon_temp_input:
     case hwmon_temp_min_alarm:
     case hwmon_temp_max_alarm:
     case hwmon_temp_crit_alarm:
     case hwmon_temp_emergency_alarm:
     case hwmon_temp_emergency_hyst:
     case hwmon_temp_fault:
     case hwmon_temp_label:
         return 0444;
     case hwmon_temp_min:
     case hwmon_temp_max:
     case hwmon_temp_crit:
     case hwmon_temp_emergency:
     case hwmon_temp_offset:
         return 0644;
     case hwmon_temp_crit_hyst:
         if (channel == 0)
             return 0644;
         return 0444;
     default:
         return 0;
     }
 }
 
 static int lm90_chip_read(struct device *dev, u32 attr, int channel, long *val)
 {
     struct lm90_data *data = dev_get_drvdata(dev);
     int err;
 
     mutex_lock(&data->update_lock);
     err = lm90_update_device(dev);
     mutex_unlock(&data->update_lock);
     if (err)
         return err;
 
     switch (attr) {
     case hwmon_chip_update_interval:
         *val = data->update_interval;
         break;
     case hwmon_chip_alarms:
         *val = data->alarms;
         break;
     case hwmon_chip_temp_samples:
         if (data->faultqueue_mask) {
             *val = (data->config & data->faultqueue_mask) ?
                 data->faultqueue_depth : 1;
         } else {
             switch (data->conalert & 0x0e) {
             case 0x0:
             default:
                 *val = 1;
                 break;
             case 0x2:
                 *val = 2;
                 break;
             case 0x6:
                 *val = 3;
                 break;
             case 0xe:
                 *val = 4;
                 break;
             }
         }
         break;
     default:
         return -EOPNOTSUPP;
     }
 
     return 0;
 }
 
 static int lm90_chip_write(struct device *dev, u32 attr, int channel, long val)
 {
     struct lm90_data *data = dev_get_drvdata(dev);
     struct i2c_client *client = data->client;
     int err;
 
     mutex_lock(&data->update_lock);
 
     err = lm90_update_device(dev);
     if (err)
         goto error;
 
     switch (attr) {
     case hwmon_chip_update_interval:
         err = lm90_set_convrate(client, data,
                     clamp_val(val, 0, 100000));
         break;
     case hwmon_chip_temp_samples:
         err = lm90_set_faultqueue(client, data, clamp_val(val, 1, 4));
         break;
     default:
         err = -EOPNOTSUPP;
         break;
     }
 error:
     mutex_unlock(&data->update_lock);
 
     return err;
 }
 
 static umode_t lm90_chip_is_visible(const void *data, u32 attr, int channel)
 {
     switch (attr) {
     case hwmon_chip_update_interval:
     case hwmon_chip_temp_samples:
         return 0644;
     case hwmon_chip_alarms:
         return 0444;
     default:
         return 0;
     }
 }
 
 static int lm90_read(struct device *dev, enum hwmon_sensor_types type,
              u32 attr, int channel, long *val)
 {
     switch (type) {
     case hwmon_chip:
         return lm90_chip_read(dev, attr, channel, val);
     case hwmon_temp:
         return lm90_temp_read(dev, attr, channel, val);
     default:
         return -EOPNOTSUPP;
     }
 }
 
 static int lm90_read_string(struct device *dev, enum hwmon_sensor_types type,
                 u32 attr, int channel, const char **str)
 {
     struct lm90_data *data = dev_get_drvdata(dev);
 
     *str = data->channel_label[channel];
 
     return 0;
 }
 
 static int lm90_write(struct device *dev, enum hwmon_sensor_types type,
               u32 attr, int channel, long val)
 {
     switch (type) {
     case hwmon_chip:
         return lm90_chip_write(dev, attr, channel, val);
     case hwmon_temp:
         return lm90_temp_write(dev, attr, channel, val);
     default:
         return -EOPNOTSUPP;
     }
 }
 
 static umode_t lm90_is_visible(const void *data, enum hwmon_sensor_types type,
                    u32 attr, int channel)
 {
     switch (type) {
     case hwmon_chip:
         return lm90_chip_is_visible(data, attr, channel);
     case hwmon_temp:
         return lm90_temp_is_visible(data, attr, channel);
     default:
         return 0;
     }
 }
 
 static const char *lm90_detect_lm84(struct i2c_client *client)
 {
     static const u8 regs[] = {
         LM90_REG_STATUS, LM90_REG_LOCAL_TEMP, LM90_REG_LOCAL_HIGH,
         LM90_REG_REMOTE_TEMPH, LM90_REG_REMOTE_HIGHH
     };
     int status = i2c_smbus_read_byte_data(client, LM90_REG_STATUS);
     int reg1, reg2, reg3, reg4;
     bool nonzero = false;
     u8 ff = 0xff;
     int i;
 
     if (status < 0 || (status & 0xab))
         return NULL;
 
     /*
      * For LM84, undefined registers return the most recent value.
      * Repeat several times, each time checking against a different
      * (presumably) existing register.
      */
     for (i = 0; i < ARRAY_SIZE(regs); i++) {
         reg1 = i2c_smbus_read_byte_data(client, regs[i]);
         reg2 = i2c_smbus_read_byte_data(client, LM90_REG_REMOTE_TEMPL);
         reg3 = i2c_smbus_read_byte_data(client, LM90_REG_LOCAL_LOW);
         reg4 = i2c_smbus_read_byte_data(client, LM90_REG_REMOTE_LOWH);
 
         if (reg1 < 0)
             return NULL;
 
         /* If any register has a different value, this is not an LM84 */
         if (reg2 != reg1 || reg3 != reg1 || reg4 != reg1)
             return NULL;
 
         nonzero |= reg1 || reg2 || reg3 || reg4;
         ff &= reg1;
     }
     /*
      * If all registers always returned 0 or 0xff, all bets are off,
      * and we can not make any predictions about the chip type.
      */
     return nonzero && ff != 0xff ? "lm84" : NULL;
 }
 
 static const char *lm90_detect_max1617(struct i2c_client *client, int config1)
 {
     int status = i2c_smbus_read_byte_data(client, LM90_REG_STATUS);
     int llo, rlo, lhi, rhi;
 
     if (status < 0 || (status & 0x03))
         return NULL;
 
     if (config1 & 0x3f)
         return NULL;
 
     /*
      * Fail if unsupported registers return anything but 0xff.
      * The calling code already checked man_id and chip_id.
      * A byte read operation repeats the most recent read operation
      * and should also return 0xff.
      */
     if (i2c_smbus_read_byte_data(client, LM90_REG_REMOTE_TEMPL) != 0xff ||
         i2c_smbus_read_byte_data(client, MAX6657_REG_LOCAL_TEMPL) != 0xff ||
         i2c_smbus_read_byte_data(client, LM90_REG_REMOTE_LOWL) != 0xff ||
         i2c_smbus_read_byte(client) != 0xff)
         return NULL;
 
     llo = i2c_smbus_read_byte_data(client, LM90_REG_LOCAL_LOW);
     rlo = i2c_smbus_read_byte_data(client, LM90_REG_REMOTE_LOWH);
 
     lhi = i2c_smbus_read_byte_data(client, LM90_REG_LOCAL_HIGH);
     rhi = i2c_smbus_read_byte_data(client, LM90_REG_REMOTE_HIGHH);
 
     if (llo < 0 || rlo < 0)
         return NULL;
 
     /*
      * A byte read operation repeats the most recent read and should
      * return the same value.
      */
     if (i2c_smbus_read_byte(client) != rhi)
         return NULL;
 
     /*
      * The following two checks are marginal since the checked values
      * are strictly speaking valid.
      */
 
     /* fail for negative high limits; this also catches read errors */
     if ((s8)lhi < 0 || (s8)rhi < 0)
         return NULL;
 
     /* fail if low limits are larger than or equal to high limits */
     if ((s8)llo >= lhi || (s8)rlo >= rhi)
         return NULL;
 
     if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
         /*
          * Word read operations return 0xff in second byte
          */
         if (i2c_smbus_read_word_data(client, LM90_REG_REMOTE_TEMPL) !=
                         0xffff)
             return NULL;
         if (i2c_smbus_read_word_data(client, LM90_REG_CONFIG1) !=
                         (config1 | 0xff00))
             return NULL;
         if (i2c_smbus_read_word_data(client, LM90_REG_LOCAL_HIGH) !=
                         (lhi | 0xff00))
             return NULL;
     }
 
     return "max1617";
 }
 
 static const char *lm90_detect_national(struct i2c_client *client, int chip_id,
                     int config1, int convrate)
 {
     int config2 = i2c_smbus_read_byte_data(client, LM90_REG_CONFIG2);
     int address = client->addr;
     const char *name = NULL;
 
     if (config2 < 0)
         return NULL;
 
     if ((config1 & 0x2a) || (config2 & 0xf8) || convrate > 0x09)
         return NULL;
 
     if (address != 0x4c && address != 0x4d)
         return NULL;
 
     switch (chip_id & 0xf0) {
     case 0x10:  /* LM86 */
         if (address == 0x4c)
             name = "lm86";
         break;
     case 0x20:  /* LM90 */
         if (address == 0x4c)
             name = "lm90";
         break;
     case 0x30:  /* LM89/LM99 */
         name = "lm99";  /* detect LM89 as LM99 */
         break;
     default:
         break;
     }
 
     return name;
 }
 
 static const char *lm90_detect_on(struct i2c_client *client, int chip_id, int config1,
                   int convrate)
 {
     int address = client->addr;
     const char *name = NULL;
 
     switch (chip_id) {
     case 0xca:      /* NCT218 */
         if ((address == 0x4c || address == 0x4d) && !(config1 & 0x1b) &&
             convrate <= 0x0a)
             name = "nct218";
         break;
     default:
         break;
     }
     return name;
 }
 
 static const char *lm90_detect_analog(struct i2c_client *client, bool common_address,
                       int chip_id, int config1, int convrate)
 {
     int status = i2c_smbus_read_byte_data(client, LM90_REG_STATUS);
     int config2 = i2c_smbus_read_byte_data(client, ADT7481_REG_CONFIG2);
     int man_id2 = i2c_smbus_read_byte_data(client, ADT7481_REG_MAN_ID);
     int chip_id2 = i2c_smbus_read_byte_data(client, ADT7481_REG_CHIP_ID);
     int address = client->addr;
     const char *name = NULL;
 
     if (status < 0 || config2 < 0 || man_id2 < 0 || chip_id2 < 0)
         return NULL;
 
     /*
      * The following chips should be detected by this function. Known
      * register values are listed. Registers 0x3d .. 0x3e are undocumented
      * for most of the chips, yet appear to return a well defined value.
      * Register 0xff is undocumented for some of the chips. Register 0x3f
      * is undocumented for all chips, but also returns a well defined value.
      * Values are as reported from real chips unless mentioned otherwise.
      * The code below checks values for registers 0x3d, 0x3e, and 0xff,
      * but not for register 0x3f.
      *
      * Chip         Register
      *      3d  3e  3f  fe  ff  Notes
      * ----------------------------------------------------------
      * adm1020  00  00  00  41  39
      * adm1021  00  00  00  41  03
      * adm1021a 00  00  00  41  3c
      * adm1023  00  00  00  41  3c  same as adm1021a
      * adm1032  00  00  00  41  42
      *
      * adt7421  21  41  04  41  04
      * adt7461  00  00  00  41  51
      * adt7461a 61  41  05  41  57
      * adt7481  81  41  02  41  62
      * adt7482  -   -   -   41  65  datasheet
      *      82  41  05  41  75  real chip
      * adt7483  83  41  04  41  94
      *
      * nct72    61  41  07  41  55
      * nct210   00  00  00  41  3f
      * nct214   61  41  08  41  5a
      * nct1008  -   -   -   41  57  datasheet rev. 3
      *      61  41  06  41  54  real chip
      *
      * nvt210   -   -   -   41  -   datasheet
      * nvt211   -   -   -   41  -   datasheet
      */
     switch (chip_id) {
     case 0x00 ... 0x03: /* ADM1021 */
     case 0x05 ... 0x0f:
         if (man_id2 == 0x00 && chip_id2 == 0x00 && common_address &&
             !(status & 0x03) && !(config1 & 0x3f) && !(convrate & 0xf8))
             name = "adm1021";
         break;
     case 0x04:      /* ADT7421 (undocumented) */
         if (man_id2 == 0x41 && chip_id2 == 0x21 &&
             (address == 0x4c || address == 0x4d) &&
             (config1 & 0x0b) == 0x08 && convrate <= 0x0a)
             name = "adt7421";
         break;
     case 0x30 ... 0x38: /* ADM1021A, ADM1023 */
     case 0x3a ... 0x3e:
         /*
          * ADM1021A and compatible chips will be mis-detected as
          * ADM1023. Chips labeled 'ADM1021A' and 'ADM1023' were both
          * found to have a Chip ID of 0x3c.
          * ADM1021A does not officially support low byte registers
          * (0x12 .. 0x14), but a chip labeled ADM1021A does support it.
          * Official support for the temperature offset high byte
          * register (0x11) was added to revision F of the ADM1021A
          * datasheet.
          * It is currently unknown if there is a means to distinguish
          * ADM1021A from ADM1023, and/or if revisions of ADM1021A exist
          * which differ in functionality from ADM1023.
          */
         if (man_id2 == 0x00 && chip_id2 == 0x00 && common_address &&
             !(status & 0x03) && !(config1 & 0x3f) && !(convrate & 0xf8))
             name = "adm1023";
         break;
     case 0x39:      /* ADM1020 (undocumented) */
         if (man_id2 == 0x00 && chip_id2 == 0x00 &&
             (address == 0x4c || address == 0x4d || address == 0x4e) &&
             !(status & 0x03) && !(config1 & 0x3f) && !(convrate & 0xf8))
             name = "adm1020";
         break;
     case 0x3f:      /* NCT210 */
         if (man_id2 == 0x00 && chip_id2 == 0x00 && common_address &&
             !(status & 0x03) && !(config1 & 0x3f) && !(convrate & 0xf8))
             name = "nct210";
         break;
     case 0x40 ... 0x4f: /* ADM1032 */
         if (man_id2 == 0x00 && chip_id2 == 0x00 &&
             (address == 0x4c || address == 0x4d) && !(config1 & 0x3f) &&
             convrate <= 0x0a)
             name = "adm1032";
         break;
     case 0x51:  /* ADT7461 */
         if (man_id2 == 0x00 && chip_id2 == 0x00 &&
             (address == 0x4c || address == 0x4d) && !(config1 & 0x1b) &&
             convrate <= 0x0a)
             name = "adt7461";
         break;
     case 0x54:  /* NCT1008 */
         if (man_id2 == 0x41 && chip_id2 == 0x61 &&
             (address == 0x4c || address == 0x4d) && !(config1 & 0x1b) &&
             convrate <= 0x0a)
             name = "nct1008";
         break;
     case 0x55:  /* NCT72 */
         if (man_id2 == 0x41 && chip_id2 == 0x61 &&
             (address == 0x4c || address == 0x4d) && !(config1 & 0x1b) &&
             convrate <= 0x0a)
             name = "nct72";
         break;
     case 0x57:  /* ADT7461A, NCT1008 (datasheet rev. 3) */
         if (man_id2 == 0x41 && chip_id2 == 0x61 &&
             (address == 0x4c || address == 0x4d) && !(config1 & 0x1b) &&
             convrate <= 0x0a)
             name = "adt7461a";
         break;
     case 0x5a:  /* NCT214 */
         if (man_id2 == 0x41 && chip_id2 == 0x61 &&
             common_address && !(config1 & 0x1b) && convrate <= 0x0a)
             name = "nct214";
         break;
     case 0x62:  /* ADT7481, undocumented */
         if (man_id2 == 0x41 && chip_id2 == 0x81 &&
             (address == 0x4b || address == 0x4c) && !(config1 & 0x10) &&
             !(config2 & 0x7f) && (convrate & 0x0f) <= 0x0b) {
             name = "adt7481";
         }
         break;
     case 0x65:  /* ADT7482, datasheet */
     case 0x75:  /* ADT7482, real chip */
         if (man_id2 == 0x41 && chip_id2 == 0x82 &&
             address == 0x4c && !(config1 & 0x10) && !(config2 & 0x7f) &&
             convrate <= 0x0a)
             name = "adt7482";
         break;
     case 0x94:  /* ADT7483 */
         if (man_id2 == 0x41 && chip_id2 == 0x83 &&
             common_address &&
             ((address >= 0x18 && address <= 0x1a) ||
              (address >= 0x29 && address <= 0x2b) ||
              (address >= 0x4c && address <= 0x4e)) &&
             !(config1 & 0x10) && !(config2 & 0x7f) && convrate <= 0x0a)
             name = "adt7483a";
         break;
     default:
         break;
     }
 
     return name;
 }
 
 static const char *lm90_detect_maxim(struct i2c_client *client, bool common_address,
                      int chip_id, int config1, int convrate)
 {
     int man_id, emerg, emerg2, status2;
     int address = client->addr;
     const char *name = NULL;
 
     switch (chip_id) {
     case 0x01:
         if (!common_address)
             break;
 
         /*
          * We read MAX6659_REG_REMOTE_EMERG twice, and re-read
          * LM90_REG_MAN_ID in between. If MAX6659_REG_REMOTE_EMERG
          * exists, both readings will reflect the same value. Otherwise,
          * the readings will be different.
          */
         emerg = i2c_smbus_read_byte_data(client,
                          MAX6659_REG_REMOTE_EMERG);
         man_id = i2c_smbus_read_byte_data(client,
                           LM90_REG_MAN_ID);
         emerg2 = i2c_smbus_read_byte_data(client,
                           MAX6659_REG_REMOTE_EMERG);
         status2 = i2c_smbus_read_byte_data(client,
                            MAX6696_REG_STATUS2);
         if (emerg < 0 || man_id < 0 || emerg2 < 0 || status2 < 0)
             return NULL;
 
         /*
          * Even though MAX6695 and MAX6696 do not have a chip ID
          * register, reading it returns 0x01. Bit 4 of the config1
          * register is unused and should return zero when read. Bit 0 of
          * the status2 register is unused and should return zero when
          * read.
          *
          * MAX6695 and MAX6696 have an additional set of temperature
          * limit registers. We can detect those chips by checking if
          * one of those registers exists.
          */
         if (!(config1 & 0x10) && !(status2 & 0x01) && emerg == emerg2 &&
             convrate <= 0x07)
             name = "max6696";
         /*
          * The chip_id register of the MAX6680 and MAX6681 holds the
          * revision of the chip. The lowest bit of the config1 register
          * is unused and should return zero when read, so should the
          * second to last bit of config1 (software reset). Register
          * address 0x12 (LM90_REG_REMOTE_OFFSL) exists for this chip and
          * should differ from emerg2, and emerg2 should match man_id
          * since it does not exist.
          */
         else if (!(config1 & 0x03) && convrate <= 0x07 &&
              emerg2 == man_id && emerg2 != status2)
             name = "max6680";
         /*
          * MAX1617A does not have any extended registers (register
          * address 0x10 or higher) except for manufacturer and
          * device ID registers. Unlike other chips of this series,
          * unsupported registers were observed to return a fixed value
          * of 0x01.
          * Note: Multiple chips with different markings labeled as
          * "MAX1617" (no "A") were observed to report manufacturer ID
          * 0x4d and device ID 0x01. It is unknown if other variants of
          * MAX1617/MAX617A with different behavior exist. The detection
          * code below works for those chips.
          */
         else if (!(config1 & 0x03f) && convrate <= 0x07 &&
              emerg == 0x01 && emerg2 == 0x01 && status2 == 0x01)
             name = "max1617";
         break;
     case 0x08:
         /*
          * The chip_id of the MAX6654 holds the revision of the chip.
          * The lowest 3 bits of the config1 register are unused and
          * should return zero when read.
          */
         if (common_address && !(config1 & 0x07) && convrate <= 0x07)
             name = "max6654";
         break;
     case 0x09:
         /*
          * The chip_id of the MAX6690 holds the revision of the chip.
          * The lowest 3 bits of the config1 register are unused and
          * should return zero when read.
          * Note that MAX6654 and MAX6690 are practically the same chips.
          * The only diference is the rated accuracy. Rev. 1 of the
          * MAX6690 datasheet lists a chip ID of 0x08, and a chip labeled
          * MAX6654 was observed to have a chip ID of 0x09.
          */
         if (common_address && !(config1 & 0x07) && convrate <= 0x07)
             name = "max6690";
         break;
     case 0x4d:
         /*
          * MAX6642, MAX6657, MAX6658 and MAX6659 do NOT have a chip_id
          * register. Reading from that address will return the last
          * read value, which in our case is those of the man_id
          * register, or 0x4d.
          * MAX6642 does not have a conversion rate register, nor low
          * limit registers. Reading from those registers returns the
          * last read value.
          *
          * For MAX6657, MAX6658 and MAX6659, the config1 register lacks
          * a low nibble, so the value will be those of the previous
          * read, so in our case again those of the man_id register.
          * MAX6659 has a third set of upper temperature limit registers.
          * Those registers also return values on MAX6657 and MAX6658,
          * thus the only way to detect MAX6659 is by its address.
          * For this reason it will be mis-detected as MAX6657 if its
          * address is 0x4c.
          */
         if (address >= 0x48 && address <= 0x4f && config1 == convrate &&
             !(config1 & 0x0f)) {
             int regval;
 
             /*
              * We know that this is not a MAX6657/58/59 because its
              * configuration register has the wrong value and it does
              * not appear to have a conversion rate register.
              */
 
             /* re-read manufacturer ID to have a good baseline */
             if (i2c_smbus_read_byte_data(client, LM90_REG_MAN_ID) != 0x4d)
                 break;
 
             /* check various non-existing registers */
             if (i2c_smbus_read_byte_data(client, LM90_REG_CONVRATE) != 0x4d ||
                 i2c_smbus_read_byte_data(client, LM90_REG_LOCAL_LOW) != 0x4d ||
                 i2c_smbus_read_byte_data(client, LM90_REG_REMOTE_LOWH) != 0x4d)
                 break;
 
             /* check for unused status register bits */
             regval = i2c_smbus_read_byte_data(client, LM90_REG_STATUS);
             if (regval < 0 || (regval & 0x2b))
                 break;
 
             /* re-check unsupported registers */
             if (i2c_smbus_read_byte_data(client, LM90_REG_CONVRATE) != regval ||
                 i2c_smbus_read_byte_data(client, LM90_REG_LOCAL_LOW) != regval ||
                 i2c_smbus_read_byte_data(client, LM90_REG_REMOTE_LOWH) != regval)
                 break;
 
             name = "max6642";
         } else if ((address == 0x4c || address == 0x4d || address == 0x4e) &&
                (config1 & 0x1f) == 0x0d && convrate <= 0x09) {
             if (address == 0x4c)
                 name = "max6657";
             else
                 name = "max6659";
         }
         break;
     case 0x59:
         /*
          * The chip_id register of the MAX6646/6647/6649 holds the
          * revision of the chip. The lowest 6 bits of the config1
          * register are unused and should return zero when read.
          * The I2C address of MAX6648/6692 is fixed at 0x4c.
          * MAX6646 is at address 0x4d, MAX6647 is at address 0x4e,
          * and MAX6649 is at address 0x4c. A slight difference between
          * the two sets of chips is that the remote temperature register
          * reports different values if the DXP pin is open or shorted.
          * We can use that information to help distinguish between the
          * chips. MAX6648 will be mis-detected as MAX6649 if the remote
          * diode is connected, but there isn't really anything we can
          * do about that.
          */
         if (!(config1 & 0x3f) && convrate <= 0x07) {
             int temp;
 
             switch (address) {
             case 0x4c:
                 /*
                  * MAX6649 reports an external temperature
                  * value of 0xff if DXP is open or shorted.
                  * MAX6648 reports 0x80 in that case.
                  */
                 temp = i2c_smbus_read_byte_data(client,
                                 LM90_REG_REMOTE_TEMPH);
                 if (temp == 0x80)
                     name = "max6648";
                 else
                     name = "max6649";
                 break;
             case 0x4d:
                 name = "max6646";
                 break;
             case 0x4e:
                 name = "max6647";
                 break;
             default:
                 break;
             }
         }
         break;
     default:
         break;
     }
 
     return name;
 }
 
 static const char *lm90_detect_nuvoton(struct i2c_client *client, int chip_id,
                        int config1, int convrate)
 {
     int config2 = i2c_smbus_read_byte_data(client, LM90_REG_CONFIG2);
     int address = client->addr;
     const char *name = NULL;
 
     if (config2 < 0)
         return NULL;
 
     if (address == 0x4c && !(config1 & 0x2a) && !(config2 & 0xf8)) {
         if (chip_id == 0x01 && convrate <= 0x09) {
             /* W83L771W/G */
             name = "w83l771";
         } else if ((chip_id & 0xfe) == 0x10 && convrate <= 0x08) {
             /* W83L771AWG/ASG */
             name = "w83l771";
         }
     }
     return name;
 }
 
 static const char *lm90_detect_nxp(struct i2c_client *client, bool common_address,
                    int chip_id, int config1, int convrate)
 {
     int address = client->addr;
     const char *name = NULL;
     int config2;
 
     switch (chip_id) {
     case 0x00:
         config2 = i2c_smbus_read_byte_data(client, LM90_REG_CONFIG2);
         if (config2 < 0)
             return NULL;
         if (address >= 0x48 && address <= 0x4f &&
             !(config1 & 0x2a) && !(config2 & 0xfe) && convrate <= 0x09)
             name = "sa56004";
         break;
     case 0x80:
         if (common_address && !(config1 & 0x3f) && convrate <= 0x07)
             name = "ne1618";
         break;
     default:
         break;
     }
     return name;
 }
 
 static const char *lm90_detect_gmt(struct i2c_client *client, int chip_id,
                    int config1, int convrate)
 {
     int address = client->addr;
 
     /*
      * According to the datasheet, G781 is supposed to be at I2C Address
      * 0x4c and have a chip ID of 0x01. G781-1 is supposed to be at I2C
      * address 0x4d and have a chip ID of 0x03. However, when support
      * for G781 was added, chips at 0x4c and 0x4d were found to have a
      * chip ID of 0x01. A G781-1 at I2C address 0x4d was now found with
      * chip ID 0x03.
      * To avoid detection failures, accept chip ID 0x01 and 0x03 at both
      * addresses.
      * G784 reports manufacturer ID 0x47 and chip ID 0x01. A public
      * datasheet is not available. Extensive testing suggests that
      * the chip appears to be fully compatible with G781.
      * Available register dumps show that G751 also reports manufacturer
      * ID 0x47 and chip ID 0x01 even though that chip does not officially
      * support those registers. This makes chip detection somewhat
      * vulnerable. To improve detection quality, read the offset low byte
      * and alert fault queue registers and verify that only expected bits
      * are set.
      */
     if ((chip_id == 0x01 || chip_id == 0x03) &&
         (address == 0x4c || address == 0x4d) &&
         !(config1 & 0x3f) && convrate <= 0x08) {
         int reg;
 
         reg = i2c_smbus_read_byte_data(client, LM90_REG_REMOTE_OFFSL);
         if (reg < 0 || reg & 0x1f)
             return NULL;
         reg = i2c_smbus_read_byte_data(client, TMP451_REG_CONALERT);
         if (reg < 0 || reg & 0xf1)
             return NULL;
 
         return "g781";
     }
 
     return NULL;
 }
 
 static const char *lm90_detect_ti49(struct i2c_client *client, bool common_address,
                     int chip_id, int config1, int convrate)
 {
     if (common_address && chip_id == 0x00 && !(config1 & 0x3f) && !(convrate & 0xf8)) {
         /* THMC10: Unsupported registers return 0xff */
         if (i2c_smbus_read_byte_data(client, LM90_REG_REMOTE_TEMPL) == 0xff &&
             i2c_smbus_read_byte_data(client, LM90_REG_REMOTE_CRIT) == 0xff)
             return "thmc10";
     }
     return NULL;
 }
 
 static const char *lm90_detect_ti(struct i2c_client *client, int chip_id,
                   int config1, int convrate)
 {
     int address = client->addr;
     const char *name = NULL;
 
     if (chip_id == 0x00 && !(config1 & 0x1b) && convrate <= 0x09) {
         int local_ext, conalert, chen, dfc;
 
         local_ext = i2c_smbus_read_byte_data(client,
                              TMP451_REG_LOCAL_TEMPL);
         conalert = i2c_smbus_read_byte_data(client,
                             TMP451_REG_CONALERT);
         chen = i2c_smbus_read_byte_data(client, TMP461_REG_CHEN);
         dfc = i2c_smbus_read_byte_data(client, TMP461_REG_DFC);
 
         if (!(local_ext & 0x0f) && (conalert & 0xf1) == 0x01 &&
             (chen & 0xfc) == 0x00 && (dfc & 0xfc) == 0x00) {
             if (address == 0x4c && !(chen & 0x03))
                 name = "tmp451";
             else if (address >= 0x48 && address <= 0x4f)
                 name = "tmp461";
         }
     }
 
     return name;
 }
 
 /* Return 0 if detection is successful, -ENODEV otherwise */
 static int lm90_detect(struct i2c_client *client, struct i2c_board_info *info)
 {
     struct i2c_adapter *adapter = client->adapter;
     int man_id, chip_id, config1, convrate, lhigh;
     const char *name = NULL;
     int address = client->addr;
     bool common_address =
             (address >= 0x18 && address <= 0x1a) ||
             (address >= 0x29 && address <= 0x2b) ||
             (address >= 0x4c && address <= 0x4e);
 
     if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
         return -ENODEV;
 
     /*
      * Get well defined register value for chips with neither man_id nor
      * chip_id registers.
      */
     lhigh = i2c_smbus_read_byte_data(client, LM90_REG_LOCAL_HIGH);
 
     /* detection and identification */
     man_id = i2c_smbus_read_byte_data(client, LM90_REG_MAN_ID);
     chip_id = i2c_smbus_read_byte_data(client, LM90_REG_CHIP_ID);
     config1 = i2c_smbus_read_byte_data(client, LM90_REG_CONFIG1);
     convrate = i2c_smbus_read_byte_data(client, LM90_REG_CONVRATE);
     if (man_id < 0 || chip_id < 0 || config1 < 0 || convrate < 0 || lhigh < 0)
         return -ENODEV;
 
     /* Bail out immediately if all register report the same value */
     if (lhigh == man_id && lhigh == chip_id && lhigh == config1 && lhigh == convrate)
         return -ENODEV;
 
     /*
      * If reading man_id and chip_id both return the same value as lhigh,
      * the chip may not support those registers and return the most recent read
      * value. Check again with a different register and handle accordingly.
      */
     if (man_id == lhigh && chip_id == lhigh) {
         convrate = i2c_smbus_read_byte_data(client, LM90_REG_CONVRATE);
         man_id = i2c_smbus_read_byte_data(client, LM90_REG_MAN_ID);
         chip_id = i2c_smbus_read_byte_data(client, LM90_REG_CHIP_ID);
         if (convrate < 0 || man_id < 0 || chip_id < 0)
             return -ENODEV;
         if (man_id == convrate && chip_id == convrate)
             man_id = -1;
     }
     switch (man_id) {
     case -1:    /* Chip does not support man_id / chip_id */
         if (common_address && !convrate && !(config1 & 0x7f))
             name = lm90_detect_lm84(client);
         break;
     case 0x01:  /* National Semiconductor */
         name = lm90_detect_national(client, chip_id, config1, convrate);
         break;
     case 0x1a:  /* ON */
         name = lm90_detect_on(client, chip_id, config1, convrate);
         break;
     case 0x23:  /* Genesys Logic */
         if (common_address && !(config1 & 0x3f) && !(convrate & 0xf8))
             name = "gl523sm";
         break;
     case 0x41:  /* Analog Devices */
         name = lm90_detect_analog(client, common_address, chip_id, config1,
                       convrate);
         break;
     case 0x47:  /* GMT */
         name = lm90_detect_gmt(client, chip_id, config1, convrate);
         break;
     case 0x49:  /* TI */
         name = lm90_detect_ti49(client, common_address, chip_id, config1, convrate);
         break;
     case 0x4d:  /* Maxim Integrated */
         name = lm90_detect_maxim(client, common_address, chip_id,
                      config1, convrate);
         break;
     case 0x54:  /* ON MC1066, Microchip TC1068, TCM1617 (originally TelCom) */
         if (common_address && !(config1 & 0x3f) && !(convrate & 0xf8))
             name = "mc1066";
         break;
     case 0x55:  /* TI */
         name = lm90_detect_ti(client, chip_id, config1, convrate);
         break;
     case 0x5c:  /* Winbond/Nuvoton */
         name = lm90_detect_nuvoton(client, chip_id, config1, convrate);
         break;
     case 0xa1:  /*  NXP Semiconductor/Philips */
         name = lm90_detect_nxp(client, common_address, chip_id, config1, convrate);
         break;
     case 0xff:  /* MAX1617, G767, NE1617 */
         if (common_address && chip_id == 0xff && convrate < 8)
             name = lm90_detect_max1617(client, config1);
         break;
     default:
         break;
     }
 
     if (!name) {    /* identification failed */
         dev_dbg(&adapter->dev,
             "Unsupported chip at 0x%02x (man_id=0x%02X, chip_id=0x%02X)\n",
             client->addr, man_id, chip_id);
         return -ENODEV;
     }
 
     strlcpy(info->type, name, I2C_NAME_SIZE);
 
     return 0;
 }
 
 static void lm90_restore_conf(void *_data)
 {
     struct lm90_data *data = _data;
     struct i2c_client *client = data->client;
 
     cancel_delayed_work_sync(&data->alert_work);
     cancel_work_sync(&data->report_work);
 
     /* Restore initial configuration */
     if (data->flags & LM90_HAVE_CONVRATE)
         lm90_write_convrate(data, data->convrate_orig);
     lm90_write_reg(client, LM90_REG_CONFIG1, data->config_orig);
 }
 
 static int lm90_init_client(struct i2c_client *client, struct lm90_data *data)
 {
     struct device_node *np = client->dev.of_node;
     int config, convrate;
 
     if (data->flags & LM90_HAVE_CONVRATE) {
         convrate = lm90_read_reg(client, LM90_REG_CONVRATE);
         if (convrate < 0)
             return convrate;
         data->convrate_orig = convrate;
         lm90_set_convrate(client, data, 500); /* 500ms; 2Hz conversion rate */
     } else {
         data->update_interval = 500;
     }
 
     /*
      * Start the conversions.
      */
     config = lm90_read_reg(client, LM90_REG_CONFIG1);
     if (config < 0)
         return config;
     data->config_orig = config;
     data->config = config;
 
     /* Check Temperature Range Select */
     if (data->flags & LM90_HAVE_EXTENDED_TEMP) {
         if (of_property_read_bool(np, "ti,extended-range-enable"))
             config |= 0x04;
         if (!(config & 0x04))
             data->flags &= ~LM90_HAVE_EXTENDED_TEMP;
     }
 
     /*
      * Put MAX6680/MAX8881 into extended resolution (bit 0x10,
      * 0.125 degree resolution) and range (0x08, extend range
      * to -64 degree) mode for the remote temperature sensor.
      * Note that expeciments with an actual chip do not show a difference
      * if bit 3 is set or not.
      */
     if (data->kind == max6680)
         config |= 0x18;
 
     /*
      * Put MAX6654 into extended range (0x20, extend minimum range from
      * 0 degrees to -64 degrees). Note that extended resolution is not
      * possible on the MAX6654 unless conversion rate is set to 1 Hz or
      * slower, which is intentionally not done by default.
      */
     if (data->kind == max6654)
         config |= 0x20;
 
     /*
      * Select external channel 0 for devices with three sensors
      */
     if (data->flags & LM90_HAVE_TEMP3)
         config &= ~0x08;
 
     /*
      * Interrupt is enabled by default on reset, but it may be disabled
      * by bootloader, unmask it.
      */
     if (client->irq)
         config &= ~0x80;
 
     config &= 0xBF; /* run */
     lm90_update_confreg(data, config);
 
     return devm_add_action_or_reset(&client->dev, lm90_restore_conf, data);
 }
 
 static bool lm90_is_tripped(struct i2c_client *client)
 {
     struct lm90_data *data = i2c_get_clientdata(client);
     int ret;
 
     ret = lm90_update_alarms(data, true);
     if (ret < 0)
         return false;
 
     return !!data->current_alarms;
 }
 
 static irqreturn_t lm90_irq_thread(int irq, void *dev_id)
 {
     struct i2c_client *client = dev_id;
 
     if (lm90_is_tripped(client))
         return IRQ_HANDLED;
     else
         return IRQ_NONE;
 }
 
 static void lm90_remove_pec(void *dev)
 {
     device_remove_file(dev, &dev_attr_pec);
 }
 
 static void lm90_regulator_disable(void *regulator)
 {
     regulator_disable(regulator);
 }
 
 static int lm90_probe_channel_from_dt(struct i2c_client *client,
                       struct device_node *child,
                       struct lm90_data *data)
 {
     u32 id;
     s32 val;
     int err;
     struct device *dev = &client->dev;
 
     err = of_property_read_u32(child, "reg", &id);
     if (err) {
         dev_err(dev, "missing reg property of %pOFn\n", child);
         return err;
     }
 
     if (id >= MAX_CHANNELS) {
         dev_err(dev, "invalid reg property value %d in %pOFn\n", id, child);
         return -EINVAL;
     }
 
     err = of_property_read_string(child, "label", &data->channel_label[id]);
     if (err == -ENODATA || err == -EILSEQ) {
         dev_err(dev, "invalid label property in %pOFn\n", child);
         return err;
     }
 
     if (data->channel_label[id])
         data->channel_config[id] |= HWMON_T_LABEL;
 
     err = of_property_read_s32(child, "temperature-offset-millicelsius", &val);
     if (!err) {
         if (id == 0) {
             dev_err(dev, "temperature-offset-millicelsius can't be set for internal channel\n");
             return -EINVAL;
         }
 
         err = lm90_set_temp_offset(data, lm90_temp_offset_index[id], id, val);
         if (err) {
             dev_err(dev, "can't set temperature offset %d for channel %d (%d)\n",
                 val, id, err);
             return err;
         }
     }
 
     return 0;
 }
 
 static int lm90_parse_dt_channel_info(struct i2c_client *client,
                       struct lm90_data *data)
 {
     int err;
     struct device_node *child;
     struct device *dev = &client->dev;
     const struct device_node *np = dev->of_node;
 
     for_each_child_of_node(np, child) {
         if (strcmp(child->name, "channel"))
             continue;
 
         err = lm90_probe_channel_from_dt(client, child, data);
         if (err) {
             of_node_put(child);
             return err;
         }
     }
 
     return 0;
 }
 
 static const struct hwmon_ops lm90_ops = {
     .is_visible = lm90_is_visible,
     .read = lm90_read,
     .read_string = lm90_read_string,
     .write = lm90_write,
 };
 
 static int lm90_probe(struct i2c_client *client)
 {
     struct device *dev = &client->dev;
     struct i2c_adapter *adapter = client->adapter;
     struct hwmon_channel_info *info;
     struct regulator *regulator;
     struct device *hwmon_dev;
     struct lm90_data *data;
     int err;
 
     regulator = devm_regulator_get(dev, "vcc");
     if (IS_ERR(regulator))
         return PTR_ERR(regulator);
 
     err = regulator_enable(regulator);
     if (err < 0) {
         dev_err(dev, "Failed to enable regulator: %d\n", err);
         return err;
     }
 
     err = devm_add_action_or_reset(dev, lm90_regulator_disable, regulator);
     if (err)
         return err;
 
     data = devm_kzalloc(dev, sizeof(struct lm90_data), GFP_KERNEL);
     if (!data)
         return -ENOMEM;
 
     data->client = client;
     i2c_set_clientdata(client, data);
     mutex_init(&data->update_lock);
     INIT_DELAYED_WORK(&data->alert_work, lm90_alert_work);
     INIT_WORK(&data->report_work, lm90_report_alarms);
 
     /* Set the device type */
     if (client->dev.of_node)
         data->kind = (enum chips)of_device_get_match_data(&client->dev);
     else
         data->kind = i2c_match_id(lm90_id, client)->driver_data;
 
     /*
      * Different devices have different alarm bits triggering the
      * ALERT# output
      */
     data->alert_alarms = lm90_params[data->kind].alert_alarms;
     data->resolution = lm90_params[data->kind].resolution ? : 11;
 
     /* Set chip capabilities */
     data->flags = lm90_params[data->kind].flags;
 
     if ((data->flags & (LM90_HAVE_PEC | LM90_HAVE_PARTIAL_PEC)) &&
         !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_PEC))
         data->flags &= ~(LM90_HAVE_PEC | LM90_HAVE_PARTIAL_PEC);
 
     if ((data->flags & LM90_HAVE_PARTIAL_PEC) &&
         !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
         data->flags &= ~LM90_HAVE_PARTIAL_PEC;
 
     data->chip.ops = &lm90_ops;
     data->chip.info = data->info;
 
     data->info[0] = &data->chip_info;
     info = &data->chip_info;
     info->type = hwmon_chip;
     info->config = data->chip_config;
 
     data->chip_config[0] = HWMON_C_REGISTER_TZ;
     if (data->flags & LM90_HAVE_ALARMS)
         data->chip_config[0] |= HWMON_C_ALARMS;
     if (data->flags & LM90_HAVE_CONVRATE)
         data->chip_config[0] |= HWMON_C_UPDATE_INTERVAL;
     if (data->flags & LM90_HAVE_FAULTQUEUE)
         data->chip_config[0] |= HWMON_C_TEMP_SAMPLES;
     data->info[1] = &data->temp_info;
 
     info = &data->temp_info;
     info->type = hwmon_temp;
     info->config = data->channel_config;
 
     data->channel_config[0] = HWMON_T_INPUT | HWMON_T_MAX |
         HWMON_T_MAX_ALARM;
     data->channel_config[1] = HWMON_T_INPUT | HWMON_T_MAX |
         HWMON_T_MAX_ALARM | HWMON_T_FAULT;
 
     if (data->flags & LM90_HAVE_LOW) {
         data->channel_config[0] |= HWMON_T_MIN | HWMON_T_MIN_ALARM;
         data->channel_config[1] |= HWMON_T_MIN | HWMON_T_MIN_ALARM;
     }
 
     if (data->flags & LM90_HAVE_CRIT) {
         data->channel_config[0] |= HWMON_T_CRIT | HWMON_T_CRIT_ALARM | HWMON_T_CRIT_HYST;
         data->channel_config[1] |= HWMON_T_CRIT | HWMON_T_CRIT_ALARM | HWMON_T_CRIT_HYST;
     }
 
     if (data->flags & LM90_HAVE_OFFSET)
         data->channel_config[1] |= HWMON_T_OFFSET;
 
     if (data->flags & LM90_HAVE_EMERGENCY) {
         data->channel_config[0] |= HWMON_T_EMERGENCY |
             HWMON_T_EMERGENCY_HYST;
         data->channel_config[1] |= HWMON_T_EMERGENCY |
             HWMON_T_EMERGENCY_HYST;
     }
 
     if (data->flags & LM90_HAVE_EMERGENCY_ALARM) {
         data->channel_config[0] |= HWMON_T_EMERGENCY_ALARM;
         data->channel_config[1] |= HWMON_T_EMERGENCY_ALARM;
     }
 
     if (data->flags & LM90_HAVE_TEMP3) {
         data->channel_config[2] = HWMON_T_INPUT |
             HWMON_T_MIN | HWMON_T_MAX |
             HWMON_T_CRIT | HWMON_T_CRIT_HYST |
             HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM |
             HWMON_T_CRIT_ALARM | HWMON_T_FAULT;
         if (data->flags & LM90_HAVE_EMERGENCY) {
             data->channel_config[2] |= HWMON_T_EMERGENCY |
                 HWMON_T_EMERGENCY_HYST;
         }
         if (data->flags & LM90_HAVE_EMERGENCY_ALARM)
             data->channel_config[2] |= HWMON_T_EMERGENCY_ALARM;
         if (data->flags & LM90_HAVE_OFFSET)
             data->channel_config[2] |= HWMON_T_OFFSET;
     }
 
     data->faultqueue_mask = lm90_params[data->kind].faultqueue_mask;
     data->faultqueue_depth = lm90_params[data->kind].faultqueue_depth;
     data->reg_local_ext = lm90_params[data->kind].reg_local_ext;
     if (data->flags & LM90_HAVE_REMOTE_EXT)
         data->reg_remote_ext = LM90_REG_REMOTE_TEMPL;
     data->reg_status2 = lm90_params[data->kind].reg_status2;
 
     /* Set maximum conversion rate */
     data->max_convrate = lm90_params[data->kind].max_convrate;
 
     /* Parse device-tree channel information */
     if (client->dev.of_node) {
         err = lm90_parse_dt_channel_info(client, data);
         if (err)
             return err;
     }
 
     /* Initialize the LM90 chip */
     err = lm90_init_client(client, data);
     if (err < 0) {
         dev_err(dev, "Failed to initialize device\n");
         return err;
     }
 
     /*
      * The 'pec' attribute is attached to the i2c device and thus created
      * separately.
      */
     if (data->flags & (LM90_HAVE_PEC | LM90_HAVE_PARTIAL_PEC)) {
         err = device_create_file(dev, &dev_attr_pec);
         if (err)
             return err;
         err = devm_add_action_or_reset(dev, lm90_remove_pec, dev);
         if (err)
             return err;
     }
 
     hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
                              data, &data->chip,
                              NULL);
     if (IS_ERR(hwmon_dev))
         return PTR_ERR(hwmon_dev);
 
     data->hwmon_dev = hwmon_dev;
 
     if (client->irq) {
         dev_dbg(dev, "IRQ: %d\n", client->irq);
         err = devm_request_threaded_irq(dev, client->irq,
                         NULL, lm90_irq_thread,
                         IRQF_ONESHOT, "lm90", client);
         if (err < 0) {
             dev_err(dev, "cannot request IRQ %d\n", client->irq);
             return err;
         }
     }
 
     return 0;
 }
 
 static void lm90_alert(struct i2c_client *client, enum i2c_alert_protocol type,
                unsigned int flag)
 {
     if (type != I2C_PROTOCOL_SMBUS_ALERT)
         return;
 
     if (lm90_is_tripped(client)) {
         /*
          * Disable ALERT# output, because these chips don't implement
          * SMBus alert correctly; they should only hold the alert line
          * low briefly.
          */
         struct lm90_data *data = i2c_get_clientdata(client);
 
         if ((data->flags & LM90_HAVE_BROKEN_ALERT) &&
             (data->current_alarms & data->alert_alarms)) {
             if (!(data->config & 0x80)) {
                 dev_dbg(&client->dev, "Disabling ALERT#\n");
                 lm90_update_confreg(data, data->config | 0x80);
             }
             schedule_delayed_work(&data->alert_work,
                 max_t(int, HZ, msecs_to_jiffies(data->update_interval)));
         }
     } else {
         dev_dbg(&client->dev, "Everything OK\n");
     }
 }
 
 static int __maybe_unused lm90_suspend(struct device *dev)
 {
     struct lm90_data *data = dev_get_drvdata(dev);
     struct i2c_client *client = data->client;
 
     if (client->irq)
         disable_irq(client->irq);
 
     return 0;
 }
 
 static int __maybe_unused lm90_resume(struct device *dev)
 {
     struct lm90_data *data = dev_get_drvdata(dev);
     struct i2c_client *client = data->client;
 
     if (client->irq)
         enable_irq(client->irq);
 
     return 0;
 }
 
 static SIMPLE_DEV_PM_OPS(lm90_pm_ops, lm90_suspend, lm90_resume);
 
 static struct i2c_driver lm90_driver = {
     .class      = I2C_CLASS_HWMON,
     .driver = {
         .name   = "lm90",
         .of_match_table = of_match_ptr(lm90_of_match),
         .pm = &lm90_pm_ops,
     },
     .probe_new  = lm90_probe,
     .alert      = lm90_alert,
     .id_table   = lm90_id,
     .detect     = lm90_detect,
     .address_list   = normal_i2c,
 };
 
 module_i2c_driver(lm90_driver);
 
 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
 MODULE_DESCRIPTION("LM90/ADM1032 driver");
 MODULE_LICENSE("GPL");