/*
* 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 <jesper.juhl@gmail.com>
*
* 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>
/* 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 32 ms for a status change. */
#define APPLESMC_MIN_WAIT 0x0040
#define APPLESMC_MAX_WAIT 0x8000
#define APPLESMC_STATUS_MASK 0x0f
#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] */
/* 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 SENSOR_X 0
#define SENSOR_Y 1
#define SENSOR_Z 2
#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 */
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 */
} 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_status - Wait up to 32ms for the status port to get a certain value
* (masked with 0x0f), returning zero if the value is obtained. Callers must
* hold applesmc_lock.
*/
static int __wait_status(u8 val)
{
int us;
val = val & APPLESMC_STATUS_MASK;
for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
udelay(us);
if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == val)
return 0;
}
return -EIO;
}
/*
* special treatment of command port - on newer macbooks, it seems necessary
* to resend the command byte before polling the status again. Callers must
* hold applesmc_lock.
*/
static int send_command(u8 cmd)
{
int us;
for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
outb(cmd, APPLESMC_CMD_PORT);
udelay(us);
if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == 0x0c)
return 0;
}
return -EIO;
}
static int send_argument(const char *key)
{
int i;
for (i = 0; i < 4; i++) {
outb(key[i], APPLESMC_DATA_PORT);
if (__wait_status(0x04))
return -EIO;
}
return 0;
}
static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
{
int i;
if (send_command(cmd) || send_argument(key)) {
pr_warn("%.4s: read arg fail\n", key);
return -EIO;
}
outb(len, APPLESMC_DATA_PORT);
for (i = 0; i < len; i++) {
if (__wait_status(0x05)) {
pr_warn("%.4s: read data fail\n", key);
return -EIO;
}
buffer[i] = inb(APPLESMC_DATA_PORT);
}
return 0;
}
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;
}
outb(len, APPLESMC_DATA_PORT);
for (i = 0; i < len; i++) {
if (__wait_status(0x04)) {
pr_warn("%s: write data fail\n", key);
return -EIO;
}
outb(buffer[i], APPLESMC_DATA_PORT);
}
return 0;
}
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_motion_sensor - Read motion sensor (X, Y or Z).
*/
static int applesmc_read_motion_sensor(int index, s16 *value)
{
u8 buffer[2];
int ret;
switch (index) {
case SENSOR_X:
ret = applesmc_read_key(MOTION_SENSOR_X_KEY, buffer, 2);
break;
case SENSOR_Y:
ret = applesmc_read_key(MOTION_SENSOR_Y_KEY, buffer, 2);
break;
case SENSOR_Z:
ret = applesmc_read_key(MOTION_SENSOR_Z_KEY, buffer, 2);
break;
default:
ret = -EINVAL;
}
*value = ((s16)buffer[0] << 8) | buffer[1];
return ret;
}
/*
* 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");
}
/*
* 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, right_light_sensor;
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];
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_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 acc=%d lux=%d kbd=%d\n",
s->key_count, s->fan_count, s->temp_count,
s->has_accelerometer,
s->num_light_sensors,
s->has_key_backlight);
return 0;
}
/*
* 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);
}
kfree(smcreg.cache);
smcreg.cache = NULL;
return ret;
}
static void applesmc_destroy_smcreg(void)
{
kfree(smcreg.cache);
smcreg.cache = NULL;
smcreg.init_complete = false;
}
/* 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",
.owner = THIS_MODULE,
.pm = &applesmc_pm_ops,
},
};
/*
* applesmc_calibrate - Set our "resting" values. Callers must
* hold applesmc_lock.
*/
static void applesmc_calibrate(void)
{
applesmc_read_motion_sensor(SENSOR_X, &rest_x);
applesmc_read_motion_sensor(SENSOR_Y, &rest_y);
rest_x = -rest_x;
}
static void applesmc_idev_poll(struct input_polled_dev *dev)
{
struct input_dev *idev = dev->input;
s16 x, y;
if (applesmc_read_motion_sensor(SENSOR_X, &x))
return;
if (applesmc_read_motion_sensor(SENSOR_Y, &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_motion_sensor(SENSOR_X, &x);
if (ret)
goto out;
ret = applesmc_read_motion_sensor(SENSOR_Y, &y);
if (ret)
goto out;
ret = applesmc_read_motion_sensor(SENSOR_Z, &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);
/* 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);
}
/* Displays sensor key as label */
static ssize_t applesmc_show_sensor_label(struct device *dev,
struct device_attribute *devattr, char *sysfsbuf)
{
int index = smcreg.temp_begin + to_index(devattr);
const struct applesmc_entry *entry;
entry = applesmc_get_entry_by_index(index);
if (IS_ERR(entry))
return PTR_ERR(entry);
return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
}
/* Displays degree Celsius * 1000 */
static ssize_t applesmc_show_temperature(struct device *dev,
struct device_attribute *devattr, char *sysfsbuf)
{
int index = smcreg.temp_begin + to_index(devattr);
const struct applesmc_entry *entry;
int ret;
u8 buffer[2];
unsigned int temp;
entry = applesmc_get_entry_by_index(index);
if (IS_ERR(entry))
return PTR_ERR(entry);
if (entry->len > 2)
return -EINVAL;
ret = applesmc_read_entry(entry, buffer, entry->len);
if (ret)
return ret;
if (entry->len == 2) {
temp = buffer[0] * 1000;
temp += (buffer[1] >> 6) * 250;
} else {
temp = buffer[0] * 4000;
}
return snprintf(sysfsbuf, PAGE_SIZE, "%u\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];
sprintf(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);
}
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 */
sprintf(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);
manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01;
if (ret)
return ret;
else
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);
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;
}
static ssize_t applesmc_show_fan_position(struct device *dev,
struct device_attribute *attr, char *sysfsbuf)
{
int ret;
char newkey[5];
u8 buffer[17];
sprintf(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))
printk(KERN_DEBUG "applesmc: 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);
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);
}
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];
sprintf(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;
}
/* Create accelerometer ressources */
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;
}
/* Release all ressources 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);
}
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 __initdata struct dmi_system_id applesmc_whitelist[] = {
{ 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.temp_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);