// 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 <[email protected]> * Copyright (C) 2010 Henrik Rydberg <[email protected]> * * Based on hdaps.c driver: * Copyright (C) 2005 Robert Love <[email protected]> * Copyright (C) 2005 Jesper Juhl <[email protected]> * * Fan control based on smcFanControl: * Copyright (C) 2006 Hendrik Holtmann <[email protected]> */ #define pr_fmt(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 … /* command/status port used by Apple SMC */ #define APPLESMC_CMD_PORT … #define APPLESMC_NR_PORTS … #define APPLESMC_MAX_DATA_LENGTH … /* Apple SMC status bits */ #define SMC_STATUS_AWAITING_DATA … #define SMC_STATUS_IB_CLOSED … #define SMC_STATUS_BUSY … /* Initial wait is 8us */ #define APPLESMC_MIN_WAIT … #define APPLESMC_READ_CMD … #define APPLESMC_WRITE_CMD … #define APPLESMC_GET_KEY_BY_INDEX_CMD … #define APPLESMC_GET_KEY_TYPE_CMD … #define KEY_COUNT_KEY … #define LIGHT_SENSOR_LEFT_KEY … #define LIGHT_SENSOR_RIGHT_KEY … #define BACKLIGHT_KEY … #define CLAMSHELL_KEY … #define MOTION_SENSOR_X_KEY … #define MOTION_SENSOR_Y_KEY … #define MOTION_SENSOR_Z_KEY … #define MOTION_SENSOR_KEY … #define FANS_COUNT … #define FANS_MANUAL … #define FAN_ID_FMT … #define TEMP_SENSOR_TYPE … /* List of keys used to read/write fan speeds */ static const char *const fan_speed_fmt[] = …; #define INIT_TIMEOUT_MSECS … #define INIT_WAIT_MSECS … #define APPLESMC_POLL_INTERVAL … #define APPLESMC_INPUT_FUZZ … #define APPLESMC_INPUT_FLAT … #define to_index(attr) … #define to_option(attr) … /* Dynamic device node attributes */ struct applesmc_dev_attr { … }; /* Dynamic device node group */ struct applesmc_node_group { … }; /* AppleSMC entry - cached register information */ struct applesmc_entry { … }; /* Register lookup and registers common to all SMCs */ static struct applesmc_registers { … } smcreg = …; 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) { … } /* send_byte - Write to SMC data port. Callers must hold applesmc_lock. */ static int send_byte(u8 cmd, u16 port) { … } /* send_command - Write a command to the SMC. Callers must hold applesmc_lock. */ static int send_command(u8 cmd) { … } /* * 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) { … } static int send_argument(const char *key) { … } static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len) { … } static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len) { … } static int read_register_count(unsigned int *count) { … } /* * 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) { … } static int applesmc_write_entry(const struct applesmc_entry *entry, const u8 *buf, u8 len) { … } static const struct applesmc_entry *applesmc_get_entry_by_index(int index) { … } static int applesmc_get_lower_bound(unsigned int *lo, const char *key) { … } static int applesmc_get_upper_bound(unsigned int *hi, const char *key) { … } static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key) { … } static int applesmc_read_key(const char *key, u8 *buffer, u8 len) { … } static int applesmc_write_key(const char *key, const u8 *buffer, u8 len) { … } static int applesmc_has_key(const char *key, bool *value) { … } /* * applesmc_read_s16 - Read 16-bit signed big endian register */ static int applesmc_read_s16(const char *key, s16 *value) { … } /* * applesmc_device_init - initialize the accelerometer. Can sleep. */ static void applesmc_device_init(void) { … } static int applesmc_init_index(struct applesmc_registers *s) { … } /* * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent. */ static int applesmc_init_smcreg_try(void) { … } static void applesmc_destroy_smcreg(void) { … } /* * applesmc_init_smcreg - Initialize register cache. * * Retries until initialization is successful, or the operation times out. * */ static int applesmc_init_smcreg(void) { … } /* Device model stuff */ static int applesmc_probe(struct platform_device *dev) { … } /* Synchronize device with memorized backlight state */ static int applesmc_pm_resume(struct device *dev) { … } /* Reinitialize device on resume from hibernation */ static int applesmc_pm_restore(struct device *dev) { … } static const struct dev_pm_ops applesmc_pm_ops = …; static struct platform_driver applesmc_driver = …; /* * applesmc_calibrate - Set our "resting" values. Callers must * hold applesmc_lock. */ static void applesmc_calibrate(void) { … } static void applesmc_idev_poll(struct input_dev *idev) { … } /* Sysfs Files */ static ssize_t applesmc_name_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t applesmc_position_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t applesmc_light_show(struct device *dev, struct device_attribute *attr, char *sysfsbuf) { … } /* Displays sensor key as label */ static ssize_t applesmc_show_sensor_label(struct device *dev, struct device_attribute *devattr, char *sysfsbuf) { … } /* Displays degree Celsius * 1000 */ static ssize_t applesmc_show_temperature(struct device *dev, struct device_attribute *devattr, char *sysfsbuf) { … } static ssize_t applesmc_show_fan_speed(struct device *dev, struct device_attribute *attr, char *sysfsbuf) { … } static ssize_t applesmc_store_fan_speed(struct device *dev, struct device_attribute *attr, const char *sysfsbuf, size_t count) { … } static ssize_t applesmc_show_fan_manual(struct device *dev, struct device_attribute *attr, char *sysfsbuf) { … } static ssize_t applesmc_store_fan_manual(struct device *dev, struct device_attribute *attr, const char *sysfsbuf, size_t count) { … } static ssize_t applesmc_show_fan_position(struct device *dev, struct device_attribute *attr, char *sysfsbuf) { … } static ssize_t applesmc_calibrate_show(struct device *dev, struct device_attribute *attr, char *sysfsbuf) { … } static ssize_t applesmc_calibrate_store(struct device *dev, struct device_attribute *attr, const char *sysfsbuf, size_t count) { … } static void applesmc_backlight_set(struct work_struct *work) { … } static DECLARE_WORK(backlight_work, &applesmc_backlight_set); static void applesmc_brightness_set(struct led_classdev *led_cdev, enum led_brightness value) { … } static ssize_t applesmc_key_count_show(struct device *dev, struct device_attribute *attr, char *sysfsbuf) { … } static ssize_t applesmc_key_at_index_read_show(struct device *dev, struct device_attribute *attr, char *sysfsbuf) { … } static ssize_t applesmc_key_at_index_data_length_show(struct device *dev, struct device_attribute *attr, char *sysfsbuf) { … } static ssize_t applesmc_key_at_index_type_show(struct device *dev, struct device_attribute *attr, char *sysfsbuf) { … } static ssize_t applesmc_key_at_index_name_show(struct device *dev, struct device_attribute *attr, char *sysfsbuf) { … } static ssize_t applesmc_key_at_index_show(struct device *dev, struct device_attribute *attr, char *sysfsbuf) { … } static ssize_t applesmc_key_at_index_store(struct device *dev, struct device_attribute *attr, const char *sysfsbuf, size_t count) { … } static struct led_classdev applesmc_backlight = …; static struct applesmc_node_group info_group[] = …; static struct applesmc_node_group accelerometer_group[] = …; static struct applesmc_node_group light_sensor_group[] = …; static struct applesmc_node_group fan_group[] = …; static struct applesmc_node_group temp_group[] = …; /* Module stuff */ /* * applesmc_destroy_nodes - remove files and free associated memory */ static void applesmc_destroy_nodes(struct applesmc_node_group *groups) { … } /* * applesmc_create_nodes - create a two-dimensional group of sysfs files */ static int applesmc_create_nodes(struct applesmc_node_group *groups, int num) { … } /* Create accelerometer resources */ static int applesmc_create_accelerometer(void) { … } /* Release all resources used by the accelerometer */ static void applesmc_release_accelerometer(void) { … } static int applesmc_create_light_sensor(void) { … } static void applesmc_release_light_sensor(void) { … } static int applesmc_create_key_backlight(void) { … } static void applesmc_release_key_backlight(void) { … } static int applesmc_dmi_match(const struct dmi_system_id *id) { … } /* * 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 = …; static int __init applesmc_init(void) { … } static void __exit applesmc_exit(void) { … } module_init(…) …; module_exit(applesmc_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);
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