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 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * drivers/hwmon/applesmc.c - driver for Apple's SMC (accelerometer, temperature
  * sensors, fan control, keyboard backlight control) used in Intel-based Apple
  * computers.
  *
  * Copyright (C) 2007 Nicolas Boichat <nicolas@boichat.ch>
  * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
  *
  * Based on hdaps.c driver:
  * Copyright (C) 2005 Robert Love <rml@novell.com>
  * Copyright (C) 2005 Jesper Juhl <jj@chaosbits.net>
  *
  * Fan control based on smcFanControl:
  * Copyright (C) 2006 Hendrik Holtmann <holtmann@mac.com>
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/input.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/timer.h>
 #include <linux/dmi.h>
 #include <linux/mutex.h>
 #include <linux/hwmon-sysfs.h>
 #include <linux/io.h>
 #include <linux/leds.h>
 #include <linux/hwmon.h>
 #include <linux/workqueue.h>
 #include <linux/err.h>
 #include <linux/bits.h>
 
 /* data port used by Apple SMC */
 #define APPLESMC_DATA_PORT  0x300
 /* command/status port used by Apple SMC */
 #define APPLESMC_CMD_PORT   0x304
 
 #define APPLESMC_NR_PORTS   32 /* 0x300-0x31f */
 
 #define APPLESMC_MAX_DATA_LENGTH 32
 
 /* Apple SMC status bits */
 #define SMC_STATUS_AWAITING_DATA  BIT(0) /* SMC has data waiting to be read */
 #define SMC_STATUS_IB_CLOSED      BIT(1) /* Will ignore any input */
 #define SMC_STATUS_BUSY           BIT(2) /* Command in progress */
 
 /* Initial wait is 8us */
 #define APPLESMC_MIN_WAIT      0x0008
 
 #define APPLESMC_READ_CMD   0x10
 #define APPLESMC_WRITE_CMD  0x11
 #define APPLESMC_GET_KEY_BY_INDEX_CMD   0x12
 #define APPLESMC_GET_KEY_TYPE_CMD   0x13
 
 #define KEY_COUNT_KEY       "#KEY" /* r-o ui32 */
 
 #define LIGHT_SENSOR_LEFT_KEY   "ALV0" /* r-o {alv (6-10 bytes) */
 #define LIGHT_SENSOR_RIGHT_KEY  "ALV1" /* r-o {alv (6-10 bytes) */
 #define BACKLIGHT_KEY       "LKSB" /* w-o {lkb (2 bytes) */
 
 #define CLAMSHELL_KEY       "MSLD" /* r-o ui8 (unused) */
 
 #define MOTION_SENSOR_X_KEY "MO_X" /* r-o sp78 (2 bytes) */
 #define MOTION_SENSOR_Y_KEY "MO_Y" /* r-o sp78 (2 bytes) */
 #define MOTION_SENSOR_Z_KEY "MO_Z" /* r-o sp78 (2 bytes) */
 #define MOTION_SENSOR_KEY   "MOCN" /* r/w ui16 */
 
 #define FANS_COUNT      "FNum" /* r-o ui8 */
 #define FANS_MANUAL     "FS! " /* r-w ui16 */
 #define FAN_ID_FMT      "F%dID" /* r-o char[16] */
 
 #define TEMP_SENSOR_TYPE    "sp78"
 
 /* List of keys used to read/write fan speeds */
 static const char *const fan_speed_fmt[] = {
     "F%dAc",        /* actual speed */
     "F%dMn",        /* minimum speed (rw) */
     "F%dMx",        /* maximum speed */
     "F%dSf",        /* safe speed - not all models */
     "F%dTg",        /* target speed (manual: rw) */
 };
 
 #define INIT_TIMEOUT_MSECS  5000    /* wait up to 5s for device init ... */
 #define INIT_WAIT_MSECS     50  /* ... in 50ms increments */
 
 #define APPLESMC_POLL_INTERVAL  50  /* msecs */
 #define APPLESMC_INPUT_FUZZ 4   /* input event threshold */
 #define APPLESMC_INPUT_FLAT 4
 
 #define to_index(attr) (to_sensor_dev_attr(attr)->index & 0xffff)
 #define to_option(attr) (to_sensor_dev_attr(attr)->index >> 16)
 
 /* Dynamic device node attributes */
 struct applesmc_dev_attr {
     struct sensor_device_attribute sda; /* hwmon attributes */
     char name[32];              /* room for node file name */
 };
 
 /* Dynamic device node group */
 struct applesmc_node_group {
     char *format;               /* format string */
     void *show;             /* show function */
     void *store;                /* store function */
     int option;             /* function argument */
     struct applesmc_dev_attr *nodes;    /* dynamic node array */
 };
 
 /* AppleSMC entry - cached register information */
 struct applesmc_entry {
     char key[5];        /* four-letter key code */
     u8 valid;       /* set when entry is successfully read once */
     u8 len;         /* bounded by APPLESMC_MAX_DATA_LENGTH */
     char type[5];       /* four-letter type code */
     u8 flags;       /* 0x10: func; 0x40: write; 0x80: read */
 };
 
 /* Register lookup and registers common to all SMCs */
 static struct applesmc_registers {
     struct mutex mutex;     /* register read/write mutex */
     unsigned int key_count;     /* number of SMC registers */
     unsigned int fan_count;     /* number of fans */
     unsigned int temp_count;    /* number of temperature registers */
     unsigned int temp_begin;    /* temperature lower index bound */
     unsigned int temp_end;      /* temperature upper index bound */
     unsigned int index_count;   /* size of temperature index array */
     int num_light_sensors;      /* number of light sensors */
     bool has_accelerometer;     /* has motion sensor */
     bool has_key_backlight;     /* has keyboard backlight */
     bool init_complete;     /* true when fully initialized */
     struct applesmc_entry *cache;   /* cached key entries */
     const char **index;     /* temperature key index */
 } smcreg = {
     .mutex = __MUTEX_INITIALIZER(smcreg.mutex),
 };
 
 static const int debug;
 static struct platform_device *pdev;
 static s16 rest_x;
 static s16 rest_y;
 static u8 backlight_state[2];
 
 static struct device *hwmon_dev;
 static struct input_dev *applesmc_idev;
 
 /*
  * Last index written to key_at_index sysfs file, and value to use for all other
  * key_at_index_* sysfs files.
  */
 static unsigned int key_at_index;
 
 static struct workqueue_struct *applesmc_led_wq;
 
 /*
  * Wait for specific status bits with a mask on the SMC.
  * Used before all transactions.
  * This does 10 fast loops of 8us then exponentially backs off for a
  * minimum total wait of 262ms. Depending on usleep_range this could
  * run out past 500ms.
  */
 
 static int wait_status(u8 val, u8 mask)
 {
     u8 status;
     int us;
     int i;
 
     us = APPLESMC_MIN_WAIT;
     for (i = 0; i < 24 ; i++) {
         status = inb(APPLESMC_CMD_PORT);
         if ((status & mask) == val)
             return 0;
         usleep_range(us, us * 2);
         if (i > 9)
             us <<= 1;
     }
     return -EIO;
 }
 
 /* send_byte - Write to SMC data port. Callers must hold applesmc_lock. */
 
 static int send_byte(u8 cmd, u16 port)
 {
     int status;
 
     status = wait_status(0, SMC_STATUS_IB_CLOSED);
     if (status)
         return status;
     /*
      * This needs to be a separate read looking for bit 0x04
      * after bit 0x02 falls. If consolidated with the wait above
      * this extra read may not happen if status returns both
      * simultaneously and this would appear to be required.
      */
     status = wait_status(SMC_STATUS_BUSY, SMC_STATUS_BUSY);
     if (status)
         return status;
 
     outb(cmd, port);
     return 0;
 }
 
 /* send_command - Write a command to the SMC. Callers must hold applesmc_lock. */
 
 static int send_command(u8 cmd)
 {
     int ret;
 
     ret = wait_status(0, SMC_STATUS_IB_CLOSED);
     if (ret)
         return ret;
     outb(cmd, APPLESMC_CMD_PORT);
     return 0;
 }
 
 /*
  * Based on logic from the Apple driver. This is issued before any interaction
  * If busy is stuck high, issue a read command to reset the SMC state machine.
  * If busy is stuck high after the command then the SMC is jammed.
  */
 
 static int smc_sane(void)
 {
     int ret;
 
     ret = wait_status(0, SMC_STATUS_BUSY);
     if (!ret)
         return ret;
     ret = send_command(APPLESMC_READ_CMD);
     if (ret)
         return ret;
     return wait_status(0, SMC_STATUS_BUSY);
 }
 
 static int send_argument(const char *key)
 {
     int i;
 
     for (i = 0; i < 4; i++)
         if (send_byte(key[i], APPLESMC_DATA_PORT))
             return -EIO;
     return 0;
 }
 
 static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
 {
     u8 status, data = 0;
     int i;
     int ret;
 
     ret = smc_sane();
     if (ret)
         return ret;
 
     if (send_command(cmd) || send_argument(key)) {
         pr_warn("%.4s: read arg fail\n", key);
         return -EIO;
     }
 
     /* This has no effect on newer (2012) SMCs */
     if (send_byte(len, APPLESMC_DATA_PORT)) {
         pr_warn("%.4s: read len fail\n", key);
         return -EIO;
     }
 
     for (i = 0; i < len; i++) {
         if (wait_status(SMC_STATUS_AWAITING_DATA | SMC_STATUS_BUSY,
                 SMC_STATUS_AWAITING_DATA | SMC_STATUS_BUSY)) {
             pr_warn("%.4s: read data[%d] fail\n", key, i);
             return -EIO;
         }
         buffer[i] = inb(APPLESMC_DATA_PORT);
     }
 
     /* Read the data port until bit0 is cleared */
     for (i = 0; i < 16; i++) {
         udelay(APPLESMC_MIN_WAIT);
         status = inb(APPLESMC_CMD_PORT);
         if (!(status & SMC_STATUS_AWAITING_DATA))
             break;
         data = inb(APPLESMC_DATA_PORT);
     }
     if (i)
         pr_warn("flushed %d bytes, last value is: %d\n", i, data);
 
     return wait_status(0, SMC_STATUS_BUSY);
 }
 
 static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
 {
     int i;
     int ret;
 
     ret = smc_sane();
     if (ret)
         return ret;
 
     if (send_command(cmd) || send_argument(key)) {
         pr_warn("%s: write arg fail\n", key);
         return -EIO;
     }
 
     if (send_byte(len, APPLESMC_DATA_PORT)) {
         pr_warn("%.4s: write len fail\n", key);
         return -EIO;
     }
 
     for (i = 0; i < len; i++) {
         if (send_byte(buffer[i], APPLESMC_DATA_PORT)) {
             pr_warn("%s: write data fail\n", key);
             return -EIO;
         }
     }
 
     return wait_status(0, SMC_STATUS_BUSY);
 }
 
 static int read_register_count(unsigned int *count)
 {
     __be32 be;
     int ret;
 
     ret = read_smc(APPLESMC_READ_CMD, KEY_COUNT_KEY, (u8 *)&be, 4);
     if (ret)
         return ret;
 
     *count = be32_to_cpu(be);
     return 0;
 }
 
 /*
  * Serialized I/O
  *
  * Returns zero on success or a negative error on failure.
  * All functions below are concurrency safe - callers should NOT hold lock.
  */
 
 static int applesmc_read_entry(const struct applesmc_entry *entry,
                    u8 *buf, u8 len)
 {
     int ret;
 
     if (entry->len != len)
         return -EINVAL;
     mutex_lock(&smcreg.mutex);
     ret = read_smc(APPLESMC_READ_CMD, entry->key, buf, len);
     mutex_unlock(&smcreg.mutex);
 
     return ret;
 }
 
 static int applesmc_write_entry(const struct applesmc_entry *entry,
                 const u8 *buf, u8 len)
 {
     int ret;
 
     if (entry->len != len)
         return -EINVAL;
     mutex_lock(&smcreg.mutex);
     ret = write_smc(APPLESMC_WRITE_CMD, entry->key, buf, len);
     mutex_unlock(&smcreg.mutex);
     return ret;
 }
 
 static const struct applesmc_entry *applesmc_get_entry_by_index(int index)
 {
     struct applesmc_entry *cache = &smcreg.cache[index];
     u8 key[4], info[6];
     __be32 be;
     int ret = 0;
 
     if (cache->valid)
         return cache;
 
     mutex_lock(&smcreg.mutex);
 
     if (cache->valid)
         goto out;
     be = cpu_to_be32(index);
     ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4);
     if (ret)
         goto out;
     ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6);
     if (ret)
         goto out;
 
     memcpy(cache->key, key, 4);
     cache->len = info[0];
     memcpy(cache->type, &info[1], 4);
     cache->flags = info[5];
     cache->valid = true;
 
 out:
     mutex_unlock(&smcreg.mutex);
     if (ret)
         return ERR_PTR(ret);
     return cache;
 }
 
 static int applesmc_get_lower_bound(unsigned int *lo, const char *key)
 {
     int begin = 0, end = smcreg.key_count;
     const struct applesmc_entry *entry;
 
     while (begin != end) {
         int middle = begin + (end - begin) / 2;
         entry = applesmc_get_entry_by_index(middle);
         if (IS_ERR(entry)) {
             *lo = 0;
             return PTR_ERR(entry);
         }
         if (strcmp(entry->key, key) < 0)
             begin = middle + 1;
         else
             end = middle;
     }
 
     *lo = begin;
     return 0;
 }
 
 static int applesmc_get_upper_bound(unsigned int *hi, const char *key)
 {
     int begin = 0, end = smcreg.key_count;
     const struct applesmc_entry *entry;
 
     while (begin != end) {
         int middle = begin + (end - begin) / 2;
         entry = applesmc_get_entry_by_index(middle);
         if (IS_ERR(entry)) {
             *hi = smcreg.key_count;
             return PTR_ERR(entry);
         }
         if (strcmp(key, entry->key) < 0)
             end = middle;
         else
             begin = middle + 1;
     }
 
     *hi = begin;
     return 0;
 }
 
 static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key)
 {
     int begin, end;
     int ret;
 
     ret = applesmc_get_lower_bound(&begin, key);
     if (ret)
         return ERR_PTR(ret);
     ret = applesmc_get_upper_bound(&end, key);
     if (ret)
         return ERR_PTR(ret);
     if (end - begin != 1)
         return ERR_PTR(-EINVAL);
 
     return applesmc_get_entry_by_index(begin);
 }
 
 static int applesmc_read_key(const char *key, u8 *buffer, u8 len)
 {
     const struct applesmc_entry *entry;
 
     entry = applesmc_get_entry_by_key(key);
     if (IS_ERR(entry))
         return PTR_ERR(entry);
 
     return applesmc_read_entry(entry, buffer, len);
 }
 
 static int applesmc_write_key(const char *key, const u8 *buffer, u8 len)
 {
     const struct applesmc_entry *entry;
 
     entry = applesmc_get_entry_by_key(key);
     if (IS_ERR(entry))
         return PTR_ERR(entry);
 
     return applesmc_write_entry(entry, buffer, len);
 }
 
 static int applesmc_has_key(const char *key, bool *value)
 {
     const struct applesmc_entry *entry;
 
     entry = applesmc_get_entry_by_key(key);
     if (IS_ERR(entry) && PTR_ERR(entry) != -EINVAL)
         return PTR_ERR(entry);
 
     *value = !IS_ERR(entry);
     return 0;
 }
 
 /*
  * applesmc_read_s16 - Read 16-bit signed big endian register
  */
 static int applesmc_read_s16(const char *key, s16 *value)
 {
     u8 buffer[2];
     int ret;
 
     ret = applesmc_read_key(key, buffer, 2);
     if (ret)
         return ret;
 
     *value = ((s16)buffer[0] << 8) | buffer[1];
     return 0;
 }
 
 /*
  * applesmc_device_init - initialize the accelerometer.  Can sleep.
  */
 static void applesmc_device_init(void)
 {
     int total;
     u8 buffer[2];
 
     if (!smcreg.has_accelerometer)
         return;
 
     for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
         if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
                 (buffer[0] != 0x00 || buffer[1] != 0x00))
             return;
         buffer[0] = 0xe0;
         buffer[1] = 0x00;
         applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
         msleep(INIT_WAIT_MSECS);
     }
 
     pr_warn("failed to init the device\n");
 }
 
 static int applesmc_init_index(struct applesmc_registers *s)
 {
     const struct applesmc_entry *entry;
     unsigned int i;
 
     if (s->index)
         return 0;
 
     s->index = kcalloc(s->temp_count, sizeof(s->index[0]), GFP_KERNEL);
     if (!s->index)
         return -ENOMEM;
 
     for (i = s->temp_begin; i < s->temp_end; i++) {
         entry = applesmc_get_entry_by_index(i);
         if (IS_ERR(entry))
             continue;
         if (strcmp(entry->type, TEMP_SENSOR_TYPE))
             continue;
         s->index[s->index_count++] = entry->key;
     }
 
     return 0;
 }
 
 /*
  * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
  */
 static int applesmc_init_smcreg_try(void)
 {
     struct applesmc_registers *s = &smcreg;
     bool left_light_sensor = false, right_light_sensor = false;
     unsigned int count;
     u8 tmp[1];
     int ret;
 
     if (s->init_complete)
         return 0;
 
     ret = read_register_count(&count);
     if (ret)
         return ret;
 
     if (s->cache && s->key_count != count) {
         pr_warn("key count changed from %d to %d\n",
             s->key_count, count);
         kfree(s->cache);
         s->cache = NULL;
     }
     s->key_count = count;
 
     if (!s->cache)
         s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
     if (!s->cache)
         return -ENOMEM;
 
     ret = applesmc_read_key(FANS_COUNT, tmp, 1);
     if (ret)
         return ret;
     s->fan_count = tmp[0];
     if (s->fan_count > 10)
         s->fan_count = 10;
 
     ret = applesmc_get_lower_bound(&s->temp_begin, "T");
     if (ret)
         return ret;
     ret = applesmc_get_lower_bound(&s->temp_end, "U");
     if (ret)
         return ret;
     s->temp_count = s->temp_end - s->temp_begin;
 
     ret = applesmc_init_index(s);
     if (ret)
         return ret;
 
     ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor);
     if (ret)
         return ret;
     ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor);
     if (ret)
         return ret;
     ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer);
     if (ret)
         return ret;
     ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight);
     if (ret)
         return ret;
 
     s->num_light_sensors = left_light_sensor + right_light_sensor;
     s->init_complete = true;
 
     pr_info("key=%d fan=%d temp=%d index=%d acc=%d lux=%d kbd=%d\n",
            s->key_count, s->fan_count, s->temp_count, s->index_count,
            s->has_accelerometer,
            s->num_light_sensors,
            s->has_key_backlight);
 
     return 0;
 }
 
 static void applesmc_destroy_smcreg(void)
 {
     kfree(smcreg.index);
     smcreg.index = NULL;
     kfree(smcreg.cache);
     smcreg.cache = NULL;
     smcreg.init_complete = false;
 }
 
 /*
  * applesmc_init_smcreg - Initialize register cache.
  *
  * Retries until initialization is successful, or the operation times out.
  *
  */
 static int applesmc_init_smcreg(void)
 {
     int ms, ret;
 
     for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) {
         ret = applesmc_init_smcreg_try();
         if (!ret) {
             if (ms)
                 pr_info("init_smcreg() took %d ms\n", ms);
             return 0;
         }
         msleep(INIT_WAIT_MSECS);
     }
 
     applesmc_destroy_smcreg();
 
     return ret;
 }
 
 /* Device model stuff */
 static int applesmc_probe(struct platform_device *dev)
 {
     int ret;
 
     ret = applesmc_init_smcreg();
     if (ret)
         return ret;
 
     applesmc_device_init();
 
     return 0;
 }
 
 /* Synchronize device with memorized backlight state */
 static int applesmc_pm_resume(struct device *dev)
 {
     if (smcreg.has_key_backlight)
         applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
     return 0;
 }
 
 /* Reinitialize device on resume from hibernation */
 static int applesmc_pm_restore(struct device *dev)
 {
     applesmc_device_init();
     return applesmc_pm_resume(dev);
 }
 
 static const struct dev_pm_ops applesmc_pm_ops = {
     .resume = applesmc_pm_resume,
     .restore = applesmc_pm_restore,
 };
 
 static struct platform_driver applesmc_driver = {
     .probe = applesmc_probe,
     .driver = {
         .name = "applesmc",
         .pm = &applesmc_pm_ops,
     },
 };
 
 /*
  * applesmc_calibrate - Set our "resting" values.  Callers must
  * hold applesmc_lock.
  */
 static void applesmc_calibrate(void)
 {
     applesmc_read_s16(MOTION_SENSOR_X_KEY, &rest_x);
     applesmc_read_s16(MOTION_SENSOR_Y_KEY, &rest_y);
     rest_x = -rest_x;
 }
 
 static void applesmc_idev_poll(struct input_dev *idev)
 {
     s16 x, y;
 
     if (applesmc_read_s16(MOTION_SENSOR_X_KEY, &x))
         return;
     if (applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y))
         return;
 
     x = -x;
     input_report_abs(idev, ABS_X, x - rest_x);
     input_report_abs(idev, ABS_Y, y - rest_y);
     input_sync(idev);
 }
 
 /* Sysfs Files */
 
 static ssize_t applesmc_name_show(struct device *dev,
                    struct device_attribute *attr, char *buf)
 {
     return sysfs_emit(buf, "applesmc\n");
 }
 
 static ssize_t applesmc_position_show(struct device *dev,
                    struct device_attribute *attr, char *buf)
 {
     int ret;
     s16 x, y, z;
 
     ret = applesmc_read_s16(MOTION_SENSOR_X_KEY, &x);
     if (ret)
         goto out;
     ret = applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y);
     if (ret)
         goto out;
     ret = applesmc_read_s16(MOTION_SENSOR_Z_KEY, &z);
     if (ret)
         goto out;
 
 out:
     if (ret)
         return ret;
 
     return sysfs_emit(buf, "(%d,%d,%d)\n", x, y, z);
 }
 
 static ssize_t applesmc_light_show(struct device *dev,
                 struct device_attribute *attr, char *sysfsbuf)
 {
     const struct applesmc_entry *entry;
     static int data_length;
     int ret;
     u8 left = 0, right = 0;
     u8 buffer[10];
 
     if (!data_length) {
         entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY);
         if (IS_ERR(entry))
             return PTR_ERR(entry);
         if (entry->len > 10)
             return -ENXIO;
         data_length = entry->len;
         pr_info("light sensor data length set to %d\n", data_length);
     }
 
     ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length);
     if (ret)
         goto out;
     /* newer macbooks report a single 10-bit bigendian value */
     if (data_length == 10) {
         left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2;
         goto out;
     }
     left = buffer[2];
 
     ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length);
     if (ret)
         goto out;
     right = buffer[2];
 
 out:
     if (ret)
         return ret;
 
     return sysfs_emit(sysfsbuf, "(%d,%d)\n", left, right);
 }
 
 /* Displays sensor key as label */
 static ssize_t applesmc_show_sensor_label(struct device *dev,
             struct device_attribute *devattr, char *sysfsbuf)
 {
     const char *key = smcreg.index[to_index(devattr)];
 
     return sysfs_emit(sysfsbuf, "%s\n", key);
 }
 
 /* Displays degree Celsius * 1000 */
 static ssize_t applesmc_show_temperature(struct device *dev,
             struct device_attribute *devattr, char *sysfsbuf)
 {
     const char *key = smcreg.index[to_index(devattr)];
     int ret;
     s16 value;
     int temp;
 
     ret = applesmc_read_s16(key, &value);
     if (ret)
         return ret;
 
     temp = 250 * (value >> 6);
 
     return sysfs_emit(sysfsbuf, "%d\n", temp);
 }
 
 static ssize_t applesmc_show_fan_speed(struct device *dev,
                 struct device_attribute *attr, char *sysfsbuf)
 {
     int ret;
     unsigned int speed = 0;
     char newkey[5];
     u8 buffer[2];
 
     scnprintf(newkey, sizeof(newkey), fan_speed_fmt[to_option(attr)],
           to_index(attr));
 
     ret = applesmc_read_key(newkey, buffer, 2);
     if (ret)
         return ret;
 
     speed = ((buffer[0] << 8 | buffer[1]) >> 2);
     return sysfs_emit(sysfsbuf, "%u\n", speed);
 }
 
 static ssize_t applesmc_store_fan_speed(struct device *dev,
                     struct device_attribute *attr,
                     const char *sysfsbuf, size_t count)
 {
     int ret;
     unsigned long speed;
     char newkey[5];
     u8 buffer[2];
 
     if (kstrtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000)
         return -EINVAL;     /* Bigger than a 14-bit value */
 
     scnprintf(newkey, sizeof(newkey), fan_speed_fmt[to_option(attr)],
           to_index(attr));
 
     buffer[0] = (speed >> 6) & 0xff;
     buffer[1] = (speed << 2) & 0xff;
     ret = applesmc_write_key(newkey, buffer, 2);
 
     if (ret)
         return ret;
     else
         return count;
 }
 
 static ssize_t applesmc_show_fan_manual(struct device *dev,
             struct device_attribute *attr, char *sysfsbuf)
 {
     int ret;
     u16 manual = 0;
     u8 buffer[2];
 
     ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
     if (ret)
         return ret;
 
     manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01;
     return sysfs_emit(sysfsbuf, "%d\n", manual);
 }
 
 static ssize_t applesmc_store_fan_manual(struct device *dev,
                      struct device_attribute *attr,
                      const char *sysfsbuf, size_t count)
 {
     int ret;
     u8 buffer[2];
     unsigned long input;
     u16 val;
 
     if (kstrtoul(sysfsbuf, 10, &input) < 0)
         return -EINVAL;
 
     ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
     if (ret)
         goto out;
 
     val = (buffer[0] << 8 | buffer[1]);
 
     if (input)
         val = val | (0x01 << to_index(attr));
     else
         val = val & ~(0x01 << to_index(attr));
 
     buffer[0] = (val >> 8) & 0xFF;
     buffer[1] = val & 0xFF;
 
     ret = applesmc_write_key(FANS_MANUAL, buffer, 2);
 
 out:
     if (ret)
         return ret;
     else
         return count;
 }
 
 static ssize_t applesmc_show_fan_position(struct device *dev,
                 struct device_attribute *attr, char *sysfsbuf)
 {
     int ret;
     char newkey[5];
     u8 buffer[17];
 
     scnprintf(newkey, sizeof(newkey), FAN_ID_FMT, to_index(attr));
 
     ret = applesmc_read_key(newkey, buffer, 16);
     buffer[16] = 0;
 
     if (ret)
         return ret;
 
     return sysfs_emit(sysfsbuf, "%s\n", buffer + 4);
 }
 
 static ssize_t applesmc_calibrate_show(struct device *dev,
                 struct device_attribute *attr, char *sysfsbuf)
 {
     return sysfs_emit(sysfsbuf, "(%d,%d)\n", rest_x, rest_y);
 }
 
 static ssize_t applesmc_calibrate_store(struct device *dev,
     struct device_attribute *attr, const char *sysfsbuf, size_t count)
 {
     applesmc_calibrate();
 
     return count;
 }
 
 static void applesmc_backlight_set(struct work_struct *work)
 {
     applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
 }
 static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
 
 static void applesmc_brightness_set(struct led_classdev *led_cdev,
                         enum led_brightness value)
 {
     int ret;
 
     backlight_state[0] = value;
     ret = queue_work(applesmc_led_wq, &backlight_work);
 
     if (debug && (!ret))
         dev_dbg(led_cdev->dev, "work was already on the queue.\n");
 }
 
 static ssize_t applesmc_key_count_show(struct device *dev,
                 struct device_attribute *attr, char *sysfsbuf)
 {
     int ret;
     u8 buffer[4];
     u32 count;
 
     ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4);
     if (ret)
         return ret;
 
     count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) +
                         ((u32)buffer[2]<<8) + buffer[3];
     return sysfs_emit(sysfsbuf, "%d\n", count);
 }
 
 static ssize_t applesmc_key_at_index_read_show(struct device *dev,
                 struct device_attribute *attr, char *sysfsbuf)
 {
     const struct applesmc_entry *entry;
     int ret;
 
     entry = applesmc_get_entry_by_index(key_at_index);
     if (IS_ERR(entry))
         return PTR_ERR(entry);
     ret = applesmc_read_entry(entry, sysfsbuf, entry->len);
     if (ret)
         return ret;
 
     return entry->len;
 }
 
 static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
                 struct device_attribute *attr, char *sysfsbuf)
 {
     const struct applesmc_entry *entry;
 
     entry = applesmc_get_entry_by_index(key_at_index);
     if (IS_ERR(entry))
         return PTR_ERR(entry);
 
     return sysfs_emit(sysfsbuf, "%d\n", entry->len);
 }
 
 static ssize_t applesmc_key_at_index_type_show(struct device *dev,
                 struct device_attribute *attr, char *sysfsbuf)
 {
     const struct applesmc_entry *entry;
 
     entry = applesmc_get_entry_by_index(key_at_index);
     if (IS_ERR(entry))
         return PTR_ERR(entry);
 
     return sysfs_emit(sysfsbuf, "%s\n", entry->type);
 }
 
 static ssize_t applesmc_key_at_index_name_show(struct device *dev,
                 struct device_attribute *attr, char *sysfsbuf)
 {
     const struct applesmc_entry *entry;
 
     entry = applesmc_get_entry_by_index(key_at_index);
     if (IS_ERR(entry))
         return PTR_ERR(entry);
 
     return sysfs_emit(sysfsbuf, "%s\n", entry->key);
 }
 
 static ssize_t applesmc_key_at_index_show(struct device *dev,
                 struct device_attribute *attr, char *sysfsbuf)
 {
     return sysfs_emit(sysfsbuf, "%d\n", key_at_index);
 }
 
 static ssize_t applesmc_key_at_index_store(struct device *dev,
     struct device_attribute *attr, const char *sysfsbuf, size_t count)
 {
     unsigned long newkey;
 
     if (kstrtoul(sysfsbuf, 10, &newkey) < 0
         || newkey >= smcreg.key_count)
         return -EINVAL;
 
     key_at_index = newkey;
     return count;
 }
 
 static struct led_classdev applesmc_backlight = {
     .name           = "smc::kbd_backlight",
     .default_trigger    = "nand-disk",
     .brightness_set     = applesmc_brightness_set,
 };
 
 static struct applesmc_node_group info_group[] = {
     { "name", applesmc_name_show },
     { "key_count", applesmc_key_count_show },
     { "key_at_index", applesmc_key_at_index_show, applesmc_key_at_index_store },
     { "key_at_index_name", applesmc_key_at_index_name_show },
     { "key_at_index_type", applesmc_key_at_index_type_show },
     { "key_at_index_data_length", applesmc_key_at_index_data_length_show },
     { "key_at_index_data", applesmc_key_at_index_read_show },
     { }
 };
 
 static struct applesmc_node_group accelerometer_group[] = {
     { "position", applesmc_position_show },
     { "calibrate", applesmc_calibrate_show, applesmc_calibrate_store },
     { }
 };
 
 static struct applesmc_node_group light_sensor_group[] = {
     { "light", applesmc_light_show },
     { }
 };
 
 static struct applesmc_node_group fan_group[] = {
     { "fan%d_label", applesmc_show_fan_position },
     { "fan%d_input", applesmc_show_fan_speed, NULL, 0 },
     { "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 },
     { "fan%d_max", applesmc_show_fan_speed, NULL, 2 },
     { "fan%d_safe", applesmc_show_fan_speed, NULL, 3 },
     { "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 },
     { "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual },
     { }
 };
 
 static struct applesmc_node_group temp_group[] = {
     { "temp%d_label", applesmc_show_sensor_label },
     { "temp%d_input", applesmc_show_temperature },
     { }
 };
 
 /* Module stuff */
 
 /*
  * applesmc_destroy_nodes - remove files and free associated memory
  */
 static void applesmc_destroy_nodes(struct applesmc_node_group *groups)
 {
     struct applesmc_node_group *grp;
     struct applesmc_dev_attr *node;
 
     for (grp = groups; grp->nodes; grp++) {
         for (node = grp->nodes; node->sda.dev_attr.attr.name; node++)
             sysfs_remove_file(&pdev->dev.kobj,
                       &node->sda.dev_attr.attr);
         kfree(grp->nodes);
         grp->nodes = NULL;
     }
 }
 
 /*
  * applesmc_create_nodes - create a two-dimensional group of sysfs files
  */
 static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
 {
     struct applesmc_node_group *grp;
     struct applesmc_dev_attr *node;
     struct attribute *attr;
     int ret, i;
 
     for (grp = groups; grp->format; grp++) {
         grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL);
         if (!grp->nodes) {
             ret = -ENOMEM;
             goto out;
         }
         for (i = 0; i < num; i++) {
             node = &grp->nodes[i];
             scnprintf(node->name, sizeof(node->name), grp->format,
                   i + 1);
             node->sda.index = (grp->option << 16) | (i & 0xffff);
             node->sda.dev_attr.show = grp->show;
             node->sda.dev_attr.store = grp->store;
             attr = &node->sda.dev_attr.attr;
             sysfs_attr_init(attr);
             attr->name = node->name;
             attr->mode = 0444 | (grp->store ? 0200 : 0);
             ret = sysfs_create_file(&pdev->dev.kobj, attr);
             if (ret) {
                 attr->name = NULL;
                 goto out;
             }
         }
     }
 
     return 0;
 out:
     applesmc_destroy_nodes(groups);
     return ret;
 }
 
 /* Create accelerometer resources */
 static int applesmc_create_accelerometer(void)
 {
     int ret;
 
     if (!smcreg.has_accelerometer)
         return 0;
 
     ret = applesmc_create_nodes(accelerometer_group, 1);
     if (ret)
         goto out;
 
     applesmc_idev = input_allocate_device();
     if (!applesmc_idev) {
         ret = -ENOMEM;
         goto out_sysfs;
     }
 
     /* initial calibrate for the input device */
     applesmc_calibrate();
 
     /* initialize the input device */
     applesmc_idev->name = "applesmc";
     applesmc_idev->id.bustype = BUS_HOST;
     applesmc_idev->dev.parent = &pdev->dev;
     input_set_abs_params(applesmc_idev, ABS_X,
             -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
     input_set_abs_params(applesmc_idev, ABS_Y,
             -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
 
     ret = input_setup_polling(applesmc_idev, applesmc_idev_poll);
     if (ret)
         goto out_idev;
 
     input_set_poll_interval(applesmc_idev, APPLESMC_POLL_INTERVAL);
 
     ret = input_register_device(applesmc_idev);
     if (ret)
         goto out_idev;
 
     return 0;
 
 out_idev:
     input_free_device(applesmc_idev);
 
 out_sysfs:
     applesmc_destroy_nodes(accelerometer_group);
 
 out:
     pr_warn("driver init failed (ret=%d)!\n", ret);
     return ret;
 }
 
 /* Release all resources used by the accelerometer */
 static void applesmc_release_accelerometer(void)
 {
     if (!smcreg.has_accelerometer)
         return;
     input_unregister_device(applesmc_idev);
     applesmc_destroy_nodes(accelerometer_group);
 }
 
 static int applesmc_create_light_sensor(void)
 {
     if (!smcreg.num_light_sensors)
         return 0;
     return applesmc_create_nodes(light_sensor_group, 1);
 }
 
 static void applesmc_release_light_sensor(void)
 {
     if (!smcreg.num_light_sensors)
         return;
     applesmc_destroy_nodes(light_sensor_group);
 }
 
 static int applesmc_create_key_backlight(void)
 {
     if (!smcreg.has_key_backlight)
         return 0;
     applesmc_led_wq = create_singlethread_workqueue("applesmc-led");
     if (!applesmc_led_wq)
         return -ENOMEM;
     return led_classdev_register(&pdev->dev, &applesmc_backlight);
 }
 
 static void applesmc_release_key_backlight(void)
 {
     if (!smcreg.has_key_backlight)
         return;
     led_classdev_unregister(&applesmc_backlight);
     destroy_workqueue(applesmc_led_wq);
 }
 
 static int applesmc_dmi_match(const struct dmi_system_id *id)
 {
     return 1;
 }
 
 /*
  * Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
  * So we need to put "Apple MacBook Pro" before "Apple MacBook".
  */
 static const struct dmi_system_id applesmc_whitelist[] __initconst = {
     { applesmc_dmi_match, "Apple MacBook Air", {
       DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
       DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") },
     },
     { applesmc_dmi_match, "Apple MacBook Pro", {
       DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
       DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro") },
     },
     { applesmc_dmi_match, "Apple MacBook", {
       DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
       DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") },
     },
     { applesmc_dmi_match, "Apple Macmini", {
       DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
       DMI_MATCH(DMI_PRODUCT_NAME, "Macmini") },
     },
     { applesmc_dmi_match, "Apple MacPro", {
       DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
       DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") },
     },
     { applesmc_dmi_match, "Apple iMac", {
       DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
       DMI_MATCH(DMI_PRODUCT_NAME, "iMac") },
     },
     { applesmc_dmi_match, "Apple Xserve", {
       DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
       DMI_MATCH(DMI_PRODUCT_NAME, "Xserve") },
     },
     { .ident = NULL }
 };
 
 static int __init applesmc_init(void)
 {
     int ret;
 
     if (!dmi_check_system(applesmc_whitelist)) {
         pr_warn("supported laptop not found!\n");
         ret = -ENODEV;
         goto out;
     }
 
     if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS,
                                 "applesmc")) {
         ret = -ENXIO;
         goto out;
     }
 
     ret = platform_driver_register(&applesmc_driver);
     if (ret)
         goto out_region;
 
     pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT,
                            NULL, 0);
     if (IS_ERR(pdev)) {
         ret = PTR_ERR(pdev);
         goto out_driver;
     }
 
     /* create register cache */
     ret = applesmc_init_smcreg();
     if (ret)
         goto out_device;
 
     ret = applesmc_create_nodes(info_group, 1);
     if (ret)
         goto out_smcreg;
 
     ret = applesmc_create_nodes(fan_group, smcreg.fan_count);
     if (ret)
         goto out_info;
 
     ret = applesmc_create_nodes(temp_group, smcreg.index_count);
     if (ret)
         goto out_fans;
 
     ret = applesmc_create_accelerometer();
     if (ret)
         goto out_temperature;
 
     ret = applesmc_create_light_sensor();
     if (ret)
         goto out_accelerometer;
 
     ret = applesmc_create_key_backlight();
     if (ret)
         goto out_light_sysfs;
 
     hwmon_dev = hwmon_device_register(&pdev->dev);
     if (IS_ERR(hwmon_dev)) {
         ret = PTR_ERR(hwmon_dev);
         goto out_light_ledclass;
     }
 
     return 0;
 
 out_light_ledclass:
     applesmc_release_key_backlight();
 out_light_sysfs:
     applesmc_release_light_sensor();
 out_accelerometer:
     applesmc_release_accelerometer();
 out_temperature:
     applesmc_destroy_nodes(temp_group);
 out_fans:
     applesmc_destroy_nodes(fan_group);
 out_info:
     applesmc_destroy_nodes(info_group);
 out_smcreg:
     applesmc_destroy_smcreg();
 out_device:
     platform_device_unregister(pdev);
 out_driver:
     platform_driver_unregister(&applesmc_driver);
 out_region:
     release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
 out:
     pr_warn("driver init failed (ret=%d)!\n", ret);
     return ret;
 }
 
 static void __exit applesmc_exit(void)
 {
     hwmon_device_unregister(hwmon_dev);
     applesmc_release_key_backlight();
     applesmc_release_light_sensor();
     applesmc_release_accelerometer();
     applesmc_destroy_nodes(temp_group);
     applesmc_destroy_nodes(fan_group);
     applesmc_destroy_nodes(info_group);
     applesmc_destroy_smcreg();
     platform_device_unregister(pdev);
     platform_driver_unregister(&applesmc_driver);
     release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
 }
 
 module_init(applesmc_init);
 module_exit(applesmc_exit);
 
 MODULE_AUTHOR("Nicolas Boichat");
 MODULE_DESCRIPTION("Apple SMC");
 MODULE_LICENSE("GPL v2");
 MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);

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