cregit-Linux how code gets into the kernel

Release 4.14 drivers/hwmon/applesmc.c

Directory: drivers/hwmon
/*
 * 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>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License v2 as published by the
 * Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/input-polldev.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>

/* 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

/* wait up to 128 ms for a status change. */

#define APPLESMC_MIN_WAIT	0x0010

#define APPLESMC_RETRY_WAIT	0x0100

#define APPLESMC_MAX_WAIT	0x20000


#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_polled_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_read - Wait for a byte to appear on SMC port. Callers must
 * hold applesmc_lock.
 */

static int wait_read(void) { u8 status; int us; for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) { udelay(us); status = inb(APPLESMC_CMD_PORT); /* read: wait for smc to settle */ if (status & 0x01) return 0; } pr_warn("wait_read() fail: 0x%02x\n", status); return -EIO; }

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Henrik Rydberg5587.30%266.67%
Nicolas Boichat812.70%133.33%
Total63100.00%3100.00%

/* * send_byte - Write to SMC port, retrying when necessary. Callers * must hold applesmc_lock. */
static int send_byte(u8 cmd, u16 port) { u8 status; int us; outb(cmd, port); for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) { udelay(us); status = inb(APPLESMC_CMD_PORT); /* write: wait for smc to settle */ if (status & 0x02) continue; /* ready: cmd accepted, return */ if (status & 0x04) return 0; /* timeout: give up */ if (us << 1 == APPLESMC_MAX_WAIT) break; /* busy: long wait and resend */ udelay(APPLESMC_RETRY_WAIT); outb(cmd, port); } pr_warn("send_byte(0x%02x, 0x%04x) fail: 0x%02x\n", cmd, port, status); return -EIO; }

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Henrik Rydberg9788.99%266.67%
Nicolas Boichat1211.01%133.33%
Total109100.00%3100.00%


static int send_command(u8 cmd) { return send_byte(cmd, APPLESMC_CMD_PORT); }

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Henrik Rydberg17100.00%1100.00%
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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; }

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Henrik Rydberg2860.87%266.67%
Nicolas Boichat1839.13%133.33%
Total46100.00%3100.00%


static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len) { u8 status, data = 0; int i; 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_read()) { 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 & 0x01)) break; data = inb(APPLESMC_DATA_PORT); } if (i) pr_warn("flushed %d bytes, last value is: %d\n", i, data); return 0; }

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Henrik Rydberg15684.32%583.33%
Nicolas Boichat2915.68%116.67%
Total185100.00%6100.00%


static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len) { int i; 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 0; }

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Henrik Rydberg9481.74%375.00%
Nicolas Boichat2118.26%125.00%
Total115100.00%4100.00%


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; }

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Henrik Rydberg3667.92%266.67%
Nicolas Boichat1732.08%133.33%
Total53100.00%3100.00%

/* * 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; }

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Henrik Rydberg4667.65%266.67%
Nicolas Boichat2232.35%133.33%
Total68100.00%3100.00%


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; }

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Henrik Rydberg4768.12%250.00%
Nicolas Boichat2231.88%250.00%
Total69100.00%4100.00%


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; }

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Henrik Rydberg16082.05%150.00%
Nicolas Boichat3517.95%150.00%
Total195100.00%2100.00%


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; }

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Henrik Rydberg10592.92%266.67%
Nicolas Boichat87.08%133.33%
Total113100.00%3100.00%


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; }

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Henrik Rydberg9280.00%250.00%
Nicolas Boichat1815.65%125.00%
René Rebe54.35%125.00%
Total115100.00%4100.00%


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); }

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Henrik Rydberg7185.54%133.33%
Nicolas Boichat910.84%133.33%
René Rebe33.61%133.33%
Total83100.00%3100.00%


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); }

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Henrik Rydberg4481.48%150.00%
Nicolas Boichat1018.52%150.00%
Total54100.00%2100.00%


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); }

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Henrik Rydberg4785.45%150.00%
Nicolas Boichat814.55%150.00%
Total55100.00%2100.00%


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; }

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Henrik Rydberg61100.00%1100.00%
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/* * 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; }

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Henrik Rydberg5990.77%266.67%
Nicolas Boichat69.23%133.33%
Total65100.00%3100.00%

/* * 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"); }

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Henrik Rydberg8683.50%250.00%
Nicolas Boichat98.74%125.00%
René Rebe87.77%125.00%
Total103100.00%4100.00%


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; }

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Henrik Rydberg127100.00%1100.00%
Total127100.00%1100.00%

/* * 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; }

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Henrik Rydberg33590.05%562.50%
René Rebe195.11%112.50%
Guenter Roeck143.76%112.50%
Shuah Khan41.08%112.50%
Total372100.00%8100.00%


static void applesmc_destroy_smcreg(void) { kfree(smcreg.index); smcreg.index = NULL; kfree(smcreg.cache); smcreg.cache = NULL; smcreg.init_complete = false; }

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Henrik Rydberg40100.00%1100.00%
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/* * 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; }

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Henrik Rydberg5887.88%266.67%
René Rebe812.12%133.33%
Total66100.00%3100.00%

/* 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; }

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Henrik Rydberg3093.75%150.00%
René Rebe26.25%150.00%
Total32100.00%2100.00%

/* 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; }

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Henrik Rydberg2379.31%266.67%
René Rebe620.69%133.33%
Total29100.00%3100.00%

/* Reinitialize device on resume from hibernation */
static int applesmc_pm_restore(struct device *dev) { applesmc_device_init(); return applesmc_pm_resume(dev); }

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Henrik Rydberg1785.00%150.00%
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Total20100.00%2100.00%

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; }

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Henrik Rydberg2068.97%266.67%
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static void applesmc_idev_poll(struct input_polled_dev *dev) { struct input_dev *idev = dev->input; 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); }

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Henrik Rydberg5873.42%266.67%
René Rebe2126.58%133.33%
Total79100.00%3100.00%

/* Sysfs Files */
static ssize_t applesmc_name_show(struct device *dev, struct device_attribute *attr, char *buf) { return snprintf(buf, PAGE_SIZE, "applesmc\n"); }

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Henrik Rydberg2583.33%150.00%
René Rebe516.67%150.00%
Total30100.00%2100.00%


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); }

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Henrik Rydberg8882.24%266.67%
Bharath Ramesh1917.76%133.33%
Total107100.00%3100.00%


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); /* 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]; if (ret) goto out; ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length); right = buffer[2]; out: if (ret) return ret; else return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg16784.77%133.33%
Alex Murray2613.20%133.33%
Bharath Ramesh42.03%133.33%
Total197100.00%3100.00%

/* 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); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg3982.98%266.67%
Alex Murray817.02%133.33%
Total47100.00%3100.00%

/* 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); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg7387.95%375.00%
Alex Murray1012.05%125.00%
Total83100.00%4100.00%


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); speed = ((buffer[0] << 8 | buffer[1]) >> 2); if (ret) return ret; else return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg9784.35%250.00%
Alex Murray1210.43%125.00%
Guenter Roeck65.22%125.00%
Total115100.00%4100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg10979.56%233.33%
Guenter Roeck1813.14%233.33%
Alex Murray96.57%116.67%
Frans Meulenbroeks10.73%116.67%
Total137100.00%6100.00%


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); manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01; if (ret) return ret; else return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg7987.78%266.67%
Alex Murray1112.22%133.33%
Total90100.00%3100.00%


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); val = (buffer[0] << 8 | buffer[1]); if (ret) goto out; 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; }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg14283.53%240.00%
Guenter Roeck148.24%120.00%
Alex Murray137.65%120.00%
Frans Meulenbroeks10.59%120.00%
Total170100.00%5100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg7379.35%250.00%
Alex Murray1314.13%125.00%
Guenter Roeck66.52%125.00%
Total92100.00%4100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg2779.41%150.00%
Alex Murray720.59%150.00%
Total34100.00%2100.00%


static ssize_t applesmc_calibrate_store(struct device *dev, struct device_attribute *attr, const char *sysfsbuf, size_t count) { applesmc_calibrate(); return count; }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg2996.67%150.00%
Alex Murray13.33%150.00%
Total30100.00%2100.00%


static void applesmc_backlight_set(struct work_struct *work) { applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg1470.00%150.00%
Alex Murray630.00%150.00%
Total20100.00%2100.00%

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"); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg3973.58%133.33%
Alex Murray815.09%133.33%
Guenter Roeck611.32%133.33%
Total53100.00%3100.00%


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); count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) + ((u32)buffer[2]<<8) + buffer[3]; if (ret) return ret; else return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg9589.62%150.00%
Alex Murray1110.38%150.00%
Total106100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg6891.89%150.00%
Alex Murray68.11%150.00%
Total74100.00%2100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg5693.33%150.00%
Alex Murray46.67%150.00%
Total60100.00%2100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg5998.33%150.00%
Alex Murray11.67%150.00%
Total60100.00%2100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg5998.33%150.00%
Alex Murray11.67%150.00%
Total60100.00%2100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg3196.88%150.00%
Alex Murray13.12%150.00%
Total32100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg5593.22%133.33%
Alex Murray35.08%133.33%
Frans Meulenbroeks11.69%133.33%
Total59100.00%3100.00%

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; } }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg89100.00%1100.00%
Total89100.00%1100.00%

/* * 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 = S_IRUGO | (grp->store ? S_IWUSR : 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; }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg22386.43%350.00%
Nicolas Boichat197.36%116.67%
René Rebe83.10%116.67%
Guenter Roeck83.10%116.67%
Total258100.00%6100.00%

/* Create accelerometer resources */
static int applesmc_create_accelerometer(void) { struct input_dev *idev; int ret; if (!smcreg.has_accelerometer) return 0; ret = applesmc_create_nodes(accelerometer_group, 1); if (ret) goto out; applesmc_idev = input_allocate_polled_device(); if (!applesmc_idev) { ret = -ENOMEM; goto out_sysfs; } applesmc_idev->poll = applesmc_idev_poll; applesmc_idev->poll_interval = APPLESMC_POLL_INTERVAL; /* initial calibrate for the input device */ applesmc_calibrate(); /* initialize the input device */ idev = applesmc_idev->input; idev->name = "applesmc"; idev->id.bustype = BUS_HOST; idev->dev.parent = &pdev->dev; idev->evbit[0] = BIT_MASK(EV_ABS); input_set_abs_params(idev, ABS_X, -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT); input_set_abs_params(idev, ABS_Y, -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT); ret = input_register_polled_device(applesmc_idev); if (ret) goto out_idev; return 0; out_idev: input_free_polled_device(applesmc_idev); out_sysfs: applesmc_destroy_nodes(accelerometer_group); out: pr_warn("driver init failed (ret=%d)!\n", ret); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Nicolas Boichat14573.60%116.67%
Dmitry Torokhov3417.26%233.33%
Henrik Rydberg157.61%116.67%
Joe Perches21.02%116.67%
Jiri Slaby10.51%116.67%
Total197100.00%6100.00%

/* Release all resources used by the accelerometer */
static void applesmc_release_accelerometer(void) { if (!smcreg.has_accelerometer) return; input_unregister_polled_device(applesmc_idev); input_free_polled_device(applesmc_idev); applesmc_destroy_nodes(accelerometer_group); }

Contributors

PersonTokensPropCommitsCommitProp
Nicolas Boichat1548.39%133.33%
Henrik Rydberg1341.94%133.33%
Dmitry Torokhov39.68%133.33%
Total31100.00%3100.00%


static int applesmc_create_light_sensor(void) { if (!smcreg.num_light_sensors) return 0; return applesmc_create_nodes(light_sensor_group, 1); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg26100.00%1100.00%
Total26100.00%1100.00%


static void applesmc_release_light_sensor(void) { if (!smcreg.num_light_sensors) return; applesmc_destroy_nodes(light_sensor_group); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg21100.00%1100.00%
Total21100.00%1100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg4495.65%150.00%
Nicolas Boichat24.35%150.00%
Total46100.00%2100.00%


static void applesmc_release_key_backlight(void) { if (!smcreg.has_key_backlight) return; led_classdev_unregister(&applesmc_backlight); destroy_workqueue(applesmc_led_wq); }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg2488.89%150.00%
Nicolas Boichat311.11%150.00%
Total27100.00%2100.00%


static int applesmc_dmi_match(const struct dmi_system_id *id) { return 1; }

Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg1493.33%266.67%
Nicolas Boichat16.67%133.33%
Total15100.00%3100.00%

/* * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Nicolas Boichat24578.03%323.08%
Henrik Rydberg5116.24%646.15%
Alex Murray103.18%17.69%
Joe Perches41.27%17.69%
Tony Jones30.96%17.69%
Jean Delvare10.32%17.69%
Total314100.00%13100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Nicolas Boichat4474.58%225.00%
Henrik Rydberg1322.03%450.00%
Tony Jones11.69%112.50%
Alex Murray11.69%112.50%
Total59100.00%8100.00%

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);

Overall Contributors

PersonTokensPropCommitsCommitProp
Henrik Rydberg454575.56%2346.94%
Nicolas Boichat95115.81%36.12%
Alex Murray1772.94%12.04%
René Rebe1131.88%12.04%
Guenter Roeck731.21%48.16%
Dmitry Torokhov380.63%24.08%
Bharath Ramesh320.53%12.04%
Riki Oktarianto260.43%12.04%
Roberto De Ioris200.33%12.04%
Joe Perches130.22%12.04%
Christoph Hellwig50.08%12.04%
Jean Delvare40.07%24.08%
Tony Jones40.07%12.04%
Shuah Khan40.07%12.04%
Frans Meulenbroeks30.05%12.04%
Parag Warudkar20.03%12.04%
Bastien Nocera20.03%12.04%
Jiri Slaby10.02%12.04%
Jesper Juhl10.02%12.04%
H Hartley Sweeten10.02%12.04%
Total6015100.00%49100.00%
Directory: drivers/hwmon
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