// 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 = 1; 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 = 0, right_light_sensor = 0; <------>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 snprintf(buf, PAGE_SIZE, "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; <------>else <------><------>return snprintf(buf, PAGE_SIZE, "(%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; <------>else <------><------>return snprintf(sysfsbuf, PAGE_SIZE, "(%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 snprintf(sysfsbuf, PAGE_SIZE, "%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 snprintf(sysfsbuf, PAGE_SIZE, "%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 snprintf(sysfsbuf, PAGE_SIZE, "%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 snprintf(sysfsbuf, PAGE_SIZE, "%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; <------>else <------><------>return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4); } static ssize_t applesmc_calibrate_show(struct device *dev, <------><------><------><------>struct device_attribute *attr, char *sysfsbuf) { <------>return snprintf(sysfsbuf, PAGE_SIZE, "(%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 snprintf(sysfsbuf, PAGE_SIZE, "%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 snprintf(sysfsbuf, PAGE_SIZE, "%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 snprintf(sysfsbuf, PAGE_SIZE, "%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 snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key); } static ssize_t applesmc_key_at_index_show(struct device *dev, <------><------><------><------>struct device_attribute *attr, char *sysfsbuf) { <------>return snprintf(sysfsbuf, PAGE_SIZE, "%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") }, <------>}, <------>{ .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);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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