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    Subject[RFC][PATCH] Apple SMC driver (hardware monitoring and control)
    Hello,

    I developed, a while ago, a driver the Apple System Management
    Controller, which provides an accelerometer (Apple Sudden Motion
    Sensor), light sensors, temperature sensors, keyboard backlight control
    and fan control on Intel-based Apple's computers (MacBook Pro, MacBook,
    MacMini).

    This patch has been tested successfully since kernel 2.6.18 (i.e. 3-4
    months ago) by various users on different systems on the mactel-linux lists.

    However, I'm not really satisfied with the way sysfs files are created:
    I use a lot of preprocessor macros to avoid repetition of code.
    The files created with these macros in /sys/devices/platform/applesmc are
    the following (on a Macbook Pro):
    fan0_actual_speed
    fan0_manual
    fan0_maximum_speed
    fan0_minimum_speed
    fan0_safe_speed
    fan0_target_speed
    fan1_actual_speed
    fan1_manual
    fan1_maximum_speed
    fan1_minimum_speed
    fan1_safe_speed
    fan1_target_speed
    temperature_0
    temperature_1
    temperature_2
    temperature_3
    temperature_4
    temperature_5
    temperature_6

    (i.e. temperature_* is created by one macro, fan*_actual_speed by
    another, ...)
    Is it acceptable programming practice? Is there a way to create these
    files in a more elegant manner?

    Also, I never call any sysfs_remove_* function, as the files are
    deleted when the module is unloaded. Is it safe to do so? Doesn't it
    cause any memory leak?

    This is my main concerns, however, I would be happy to have comments
    on the other parts of the code. (Please cc me I'm not subscribed to
    lkml)

    Best regards,

    Nicolas Boichat

    From: Nicolas Boichat <nicolas@boichat.ch>


    ---

    drivers/hwmon/Kconfig | 24 +
    drivers/hwmon/Makefile | 1
    drivers/hwmon/applesmc.c | 964 ++++++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 989 insertions(+), 0 deletions(-)

    diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
    index c3d4856..798b91d 100644
    --- a/drivers/hwmon/Kconfig
    +++ b/drivers/hwmon/Kconfig
    @@ -593,6 +593,30 @@ config SENSORS_HDAPS
    Say Y here if you have an applicable laptop and want to experience
    the awesome power of hdaps.

    +config SENSORS_APPLESMC
    + tristate "Apple SMC (Motion sensor, light sensor, keyboard backlight)"
    + depends on HWMON && INPUT && X86
    + select NEW_LEDS
    + select LEDS_CLASS
    + default n
    + help
    + This driver provides support for the Apple System Management
    + Controller, which provides an accelerometer (Apple Sudden Motion
    + Sensor), light sensors, temperature sensors, keyboard backlight
    + control and fan control.
    +
    + Only Intel-based Apple's computers are supported (MacBook Pro,
    + MacBook, MacMini).
    +
    + Data from the different sensors, keyboard backlight control and fan
    + control are accessible via sysfs.
    +
    + This driver also provides an absolute input class device, allowing
    + the laptop to act as a pinball machine-esque joystick.
    +
    + Say Y here if you have an applicable laptop and want to experience
    + the awesome power of applesmc.
    +
    config HWMON_DEBUG_CHIP
    bool "Hardware Monitoring Chip debugging messages"
    depends on HWMON
    diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
    index 4165c27..544f8d8 100644
    --- a/drivers/hwmon/Makefile
    +++ b/drivers/hwmon/Makefile
    @@ -20,6 +20,7 @@ obj-$(CONFIG_SENSORS_ADM1026) += adm1026.o
    obj-$(CONFIG_SENSORS_ADM1029) += adm1029.o
    obj-$(CONFIG_SENSORS_ADM1031) += adm1031.o
    obj-$(CONFIG_SENSORS_ADM9240) += adm9240.o
    +obj-$(CONFIG_SENSORS_APPLESMC) += applesmc.o
    obj-$(CONFIG_SENSORS_AMS) += ams/
    obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o
    obj-$(CONFIG_SENSORS_DS1621) += ds1621.o
    diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c
    new file mode 100644
    index 0000000..3bdd1a8
    --- /dev/null
    +++ b/drivers/hwmon/applesmc.c
    @@ -0,0 +1,964 @@
    +/*
    + * 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>
    + *
    + * 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
    + */
    +
    +#include <linux/delay.h>
    +#include <linux/platform_device.h>
    +#include <linux/input.h>
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/timer.h>
    +#include <linux/dmi.h>
    +#include <asm/io.h>
    +#include <linux/leds.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 5 /* 0x300-0x304 */
    +
    +#define APPLESMC_STATUS_MASK 0x0f
    +#define APPLESMC_READ_CMD 0x10
    +#define APPLESMC_WRITE_CMD 0x11
    +
    +#define LIGHT_SENSOR_LEFT_KEY "ALV0" //r-o length 6
    +#define LIGHT_SENSOR_RIGHT_KEY "ALV1" //r-o length 6
    +#define BACKLIGHT_KEY "LKSB" //w-o
    +
    +#define CLAMSHELL_KEY "MSLD" //r-o length 1 (unused)
    +
    +#define MOTION_SENSOR_X_KEY "MO_X" //r-o length 2
    +#define MOTION_SENSOR_Y_KEY "MO_Y" //r-o length 2
    +#define MOTION_SENSOR_Z_KEY "MO_Z" //r-o length 2
    +#define MOTION_SENSOR_KEY "MOCN" //r/w length 2
    +
    +#define FANS_COUNT "FNum" //r-o length 1
    +#define FANS_MANUAL "FS! " //r-w length 2
    +#define FAN_ACTUAL_SPEED "F0Ac" //r-o length 2
    +#define FAN_MIN_SPEED "F0Mn" //r-o length 2
    +#define FAN_MAX_SPEED "F0Mx" //r-o length 2
    +#define FAN_SAFE_SPEED "F0Sf" //r-o length 2
    +#define FAN_TARGET_SPEED "F0Tg" //r-w length 2
    +
    +/* Temperature sensors keys. First set for Macbook(Pro), second for Macmini */
    +static const char* temperature_sensors_sets[][8] = {
    + { "TB0T", "TC0D", "TC0P", "Th0H", "Ts0P", "Th1H", "Ts1P", NULL },
    + { "TC0D", "TC0P", NULL }
    +};
    +
    +#define INIT_TIMEOUT_MSECS 5000 /* wait up to 5s for device init ... */
    +#define INIT_WAIT_MSECS 50 /* ... in 50ms increments */
    +
    +#define APPLESMC_POLL_PERIOD (HZ/20) /* poll for input every 1/20s */
    +#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
    +
    +/* Structure to be passed to DMI_MATCH function */
    +struct dmi_match_data {
    +/* Indicates whether this computer has an accelerometer. */
    + int accelerometer;
    +/* Indicates whether this computer has light sensors and keyboard backlight. */
    + int light;
    +/* Indicates which temperature sensors set to use. */
    + int temperature_set;
    +};
    +
    +static int debug = 0;
    +static struct platform_device *pdev;
    +static s16 rest_x;
    +static s16 rest_y;
    +static struct timer_list applesmc_timer;
    +static struct input_dev *applesmc_idev;
    +
    +/* Indicates whether this computer has an accelerometer. */
    +static unsigned int applesmc_accelerometer = 0;
    +
    +/* Indicates whether this computer has light sensors and keyboard backlight. */
    +static unsigned int applesmc_light = 0;
    +
    +/* Indicates which temperature sensors set to use. */
    +static unsigned int applesmc_temperature_set = 0;
    +
    +static DECLARE_MUTEX(applesmc_sem);
    +
    +/*
    + * __wait_status - Wait up to 100ms for the status port to get a certain value
    + * (masked with 0x0f), returning zero if the value is obtained. Callers must
    + * hold applesmc_sem.
    + */
    +static int __wait_status(u8 val)
    +{
    + unsigned int i;
    +
    + val = val & APPLESMC_STATUS_MASK;
    +
    + for (i = 0; i < 10000; i++) {
    + if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == val)
    + return 0;
    + udelay(10);
    + }
    +
    + printk(KERN_WARNING "applesmc: wait status failed: %x != %x\n",
    + val, inb(APPLESMC_CMD_PORT));
    +
    + return -EIO;
    +}
    +
    +/*
    + * applesmc_read_key - reads len bytes from a given key, and put them in buffer.
    + * Returns zero on success or a negative error on failure. Callers must
    + * hold applesmc_sem.
    + */
    +static int applesmc_read_key(const char* key, u8* buffer, u8 len)
    +{
    + int ret = -EIO;
    + int i;
    +
    + outb(APPLESMC_READ_CMD, APPLESMC_CMD_PORT);
    + if (__wait_status(0x0c))
    + goto out;
    +
    + for (i = 0; i < 4; i++) {
    + outb(key[i], APPLESMC_DATA_PORT);
    + if (__wait_status(0x04))
    + goto out;
    + }
    + if (debug) printk(KERN_DEBUG "<%s", key);
    +
    + outb(len, APPLESMC_DATA_PORT);
    + if (debug) printk(KERN_DEBUG ">%x", len);
    +
    + for (i = 0; i < len; i++) {
    + if (__wait_status(0x05))
    + goto out;
    + buffer[i] = inb(APPLESMC_DATA_PORT);
    + if (debug) printk(KERN_DEBUG "<%x", buffer[i]);
    + }
    + if (debug) printk(KERN_DEBUG "\n");
    + ret = 0;
    +
    +out:
    + return ret;
    +}
    +
    +/*
    + * applesmc_write_key - writes len bytes from buffer to a given key.
    + * Returns zero on success or a negative error on failure. Callers must
    + * hold applesmc_sem.
    + */
    +static int applesmc_write_key(const char* key, u8* buffer, u8 len)
    +{
    + int ret = -EIO;
    + int i;
    +
    + outb(APPLESMC_WRITE_CMD, APPLESMC_CMD_PORT);
    + if (__wait_status(0x0c))
    + goto out;
    +
    + for (i = 0; i < 4; i++) {
    + outb(key[i], APPLESMC_DATA_PORT);
    + if (__wait_status(0x04))
    + goto out;
    + }
    +
    + outb(len, APPLESMC_DATA_PORT);
    +
    + for (i = 0; i < len; i++) {
    + if (__wait_status(0x04))
    + goto out;
    + outb(buffer[i], APPLESMC_DATA_PORT);
    + }
    +
    + ret = 0;
    +out:
    + return ret;
    +}
    +
    +/*
    + * applesmc_read_motion_sensor - Read motion sensor (X, Y or Z). Callers must
    + * hold applesmc_sem.
    + */
    +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. Returns zero on success
    + * and negative error code on failure. Can sleep.
    + */
    +static int applesmc_device_init(void)
    +{
    + int total, ret = -ENXIO;
    + u8 buffer[2];
    +
    + if (!applesmc_accelerometer) return 0;
    +
    + down(&applesmc_sem);
    +
    + for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
    + if (debug) printk(KERN_DEBUG "applesmc try %d\n", total);
    + if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
    + (buffer[0] != 0x00 || buffer[1] != 0x00)) {
    + if (total == INIT_TIMEOUT_MSECS) {
    + printk(KERN_DEBUG "applesmc: device has"
    + " already been initialized"
    + " (0x%02x, 0x%02x).\n",
    + buffer[0], buffer[1]);
    + }
    + else {
    + printk(KERN_DEBUG "applesmc: device"
    + " successfully initialized"
    + " (0x%02x, 0x%02x).\n",
    + buffer[0], buffer[1]);
    + }
    + ret = 0;
    + goto out;
    + }
    + buffer[0] = 0xe0;
    + buffer[1] = 0x00;
    + applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
    + msleep(INIT_WAIT_MSECS);
    + }
    +
    + printk(KERN_WARNING "applesmc: failed to init the device\n");
    +
    +out:
    + up(&applesmc_sem);
    + return ret;
    +}
    +
    +/*
    + * applesmc_get_fan_count - get the number of fans. Callers must NOT hold
    + * applesmc_sem.
    + */
    +static int applesmc_get_fan_count(void)
    +{
    + int ret;
    + u8 buffer[1];
    +
    + down(&applesmc_sem);
    +
    + ret = applesmc_read_key(FANS_COUNT, buffer, 1);
    +
    + up(&applesmc_sem);
    + if (ret)
    + return ret;
    + else
    + return buffer[0];
    +}
    +
    +/* Device model stuff */
    +static int applesmc_probe(struct platform_device *dev)
    +{
    + int ret;
    +
    + ret = applesmc_device_init();
    + if (ret)
    + return ret;
    +
    + printk(KERN_INFO "applesmc: device successfully initialized.\n");
    + return 0;
    +}
    +
    +static int applesmc_resume(struct platform_device *dev)
    +{
    + return applesmc_device_init();
    +}
    +
    +static struct platform_driver applesmc_driver = {
    + .probe = applesmc_probe,
    + .resume = applesmc_resume,
    + .driver = {
    + .name = "applesmc",
    + .owner = THIS_MODULE,
    + },
    +};
    +
    +/*
    + * applesmc_calibrate - Set our "resting" values. Callers must
    + * hold applesmc_sem.
    + */
    +static void applesmc_calibrate(void)
    +{
    + applesmc_read_motion_sensor(SENSOR_X, &rest_x);
    + applesmc_read_motion_sensor(SENSOR_Y, &rest_y);
    +}
    +
    +static void applesmc_mousedev_poll(unsigned long unused)
    +{
    + s16 x, y;
    +
    + /* Cannot sleep. Try nonblockingly. If we fail, try again later. */
    + if (down_trylock(&applesmc_sem)) {
    + mod_timer(&applesmc_timer, jiffies + APPLESMC_POLL_PERIOD);
    + return;
    + }
    +
    + if (applesmc_read_motion_sensor(SENSOR_X, &x))
    + goto out;
    + if (applesmc_read_motion_sensor(SENSOR_Y, &y))
    + goto out;
    +
    +
    + input_report_abs(applesmc_idev, ABS_X, x - rest_x);
    + input_report_abs(applesmc_idev, ABS_Y, y - rest_y);
    + input_sync(applesmc_idev);
    +
    +out:
    + mod_timer(&applesmc_timer, jiffies + APPLESMC_POLL_PERIOD);
    +
    + up(&applesmc_sem);
    +}
    +
    +/* Sysfs Files */
    +
    +static ssize_t applesmc_position_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + int ret;
    + s16 x, y, z;
    +
    + down(&applesmc_sem);
    +
    + 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:
    + up(&applesmc_sem);
    + if (ret)
    + return ret;
    + else
    + return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
    +}
    +
    +static ssize_t applesmc_light_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + int ret;
    + u8 left = 0, right = 0;
    + u8 buffer[6];
    +
    + down(&applesmc_sem);
    +
    + ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, 6);
    + left = buffer[2];
    + if (ret)
    + goto out;
    + ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, 6);
    + right = buffer[2];
    +
    +out:
    + up(&applesmc_sem);
    + if (ret)
    + return ret;
    + else
    + return sprintf(buf, "(%d,%d)\n", left, right);
    +}
    +
    +/* Displays °C * 100 */
    +static ssize_t applesmc_show_temperature(struct device *dev, char *buf,
    + const char *key)
    +{
    + int ret;
    + u8 buffer[2];
    + unsigned int temp;
    +
    + down(&applesmc_sem);
    +
    + ret = applesmc_read_key(key, buffer, 2);
    + temp = buffer[0]*100;
    + temp += (buffer[1] >> 6) * 25;
    +
    + up(&applesmc_sem);
    +
    + if (ret)
    + return ret;
    + else
    + return sprintf(buf, "%u\n", temp);
    +}
    +
    +static ssize_t applesmc_show_fan_speed(struct device *dev, char *buf,
    + const char* key, int offset)
    +{
    + int ret;
    + unsigned int speed = 0;
    + char newkey[5];
    + u8 buffer[2];
    +
    + newkey[0] = key[0];
    + newkey[1] = '0' + offset;
    + newkey[2] = key[2];
    + newkey[3] = key[3];
    + newkey[4] = 0;
    +
    + down(&applesmc_sem);
    +
    + ret = applesmc_read_key(newkey, buffer, 2);
    + speed = ((buffer[0] << 8 | buffer[1]) >> 2);
    +
    + up(&applesmc_sem);
    + if (ret)
    + return ret;
    + else
    + return sprintf(buf, "%u\n", speed);
    +}
    +
    +static ssize_t applesmc_store_fan_speed(struct device *dev, const char *buf,
    + size_t count, const char* key, int offset)
    +{
    + int ret;
    + u32 speed;
    + char newkey[5];
    + u8 buffer[2];
    +
    + speed = simple_strtoul(buf, NULL, 10);
    +
    + if (speed > 0x4000) /* Bigger than a 14-bit value */
    + return -EINVAL;
    +
    + newkey[0] = key[0];
    + newkey[1] = '0' + offset;
    + newkey[2] = key[2];
    + newkey[3] = key[3];
    + newkey[4] = 0;
    +
    + down(&applesmc_sem);
    +
    + buffer[0] = (speed >> 6) & 0xff;
    + buffer[1] = (speed << 2) & 0xff;
    + ret = applesmc_write_key(newkey, buffer, 2);
    +
    + up(&applesmc_sem);
    + if (ret)
    + return ret;
    + else
    + return count;
    +}
    +
    +static ssize_t applesmc_show_fan_manual(struct device *dev, char *buf,
    + int offset)
    +{
    + int ret;
    + u16 manual = 0;
    + u8 buffer[2];
    +
    + down(&applesmc_sem);
    +
    + ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
    + manual = ((buffer[0] << 8 | buffer[1]) >> offset) & 0x01;
    +
    + up(&applesmc_sem);
    + if (ret)
    + return ret;
    + else
    + return sprintf(buf, "%d\n", manual);
    +}
    +
    +static ssize_t applesmc_store_fan_manual(struct device *dev, const char *buf,
    + size_t count, int offset)
    +{
    + int ret;
    + u8 buffer[2];
    + u32 input;
    + u16 val;
    +
    + input = simple_strtoul(buf, NULL, 10);
    +
    + down(&applesmc_sem);
    +
    + ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
    + val = (buffer[0] << 8 | buffer[1]);
    + if (ret)
    + goto out;
    +
    + if (input)
    + val = val | (0x01 << offset);
    + else
    + val = val & ~(0x01 << offset);
    +
    + buffer[0] = (val >> 8) & 0xFF;
    + buffer[1] = val & 0xFF;
    +
    + ret = applesmc_write_key(FANS_MANUAL, buffer, 2);
    +
    +out:
    + up(&applesmc_sem);
    + if (ret)
    + return ret;
    + else
    + return count;
    +}
    +
    +static ssize_t applesmc_calibrate_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + return sprintf(buf, "(%d,%d)\n", rest_x, rest_y);
    +}
    +
    +static ssize_t applesmc_calibrate_store(struct device *dev,
    + struct device_attribute *attr, const char *buf, size_t count)
    +{
    + down(&applesmc_sem);
    + applesmc_calibrate();
    + up(&applesmc_sem);
    +
    + return count;
    +}
    +
    +static void applesmc_backlight_set(struct led_classdev *led_cdev,
    + enum led_brightness value)
    +{
    + u8 buffer[2];
    +
    + down(&applesmc_sem);
    + buffer[0] = value;
    + buffer[1] = 0x00;
    + applesmc_write_key(BACKLIGHT_KEY, buffer, 2);
    + up(&applesmc_sem);
    +}
    +
    +static struct led_classdev applesmc_backlight = {
    + .name = "smc:kbd_backlight",
    + .default_trigger = "nand-disk",
    + .brightness_set = applesmc_backlight_set,
    +};
    +
    +static DEVICE_ATTR(position, 0444, applesmc_position_show, NULL);
    +static DEVICE_ATTR(calibrate, 0644,
    + applesmc_calibrate_show, applesmc_calibrate_store);
    +
    +static DEVICE_ATTR(light, 0444, applesmc_light_show, NULL);
    +
    +/*
    + * Macro defining helper functions and DEVICE_ATTR for a fan sysfs entries.
    + * - show actual speed
    + * - show/store minimum speed
    + * - show maximum speed
    + * - show safe speed
    + * - show/store target speed
    + * - show/store manual mode
    + */
    +#define sysfs_fan_speeds_offset(offset) \
    +static ssize_t show_fan_actual_speed_##offset (struct device *dev, \
    + struct device_attribute *attr, char *buf) \
    +{ \
    + return applesmc_show_fan_speed(dev, buf, FAN_ACTUAL_SPEED, offset); \
    +} \
    +static DEVICE_ATTR(fan##offset##_actual_speed, S_IRUGO, \
    + show_fan_actual_speed_##offset, NULL); \
    +\
    +static ssize_t show_fan_minimum_speed_##offset (struct device *dev, \
    + struct device_attribute *attr, char *buf) \
    +{ \
    + return applesmc_show_fan_speed(dev, buf, FAN_MIN_SPEED, offset); \
    +} \
    +static ssize_t store_fan_minimum_speed_##offset (struct device *dev, \
    + struct device_attribute *attr, const char *buf, size_t count) \
    +{ \
    + return applesmc_store_fan_speed(dev, buf, count, FAN_MIN_SPEED, offset); \
    +} \
    +static DEVICE_ATTR(fan##offset##_minimum_speed, S_IRUGO | S_IWUSR, \
    + show_fan_minimum_speed_##offset, store_fan_minimum_speed_##offset); \
    +\
    +static ssize_t show_fan_maximum_speed_##offset (struct device *dev, \
    + struct device_attribute *attr, char *buf) \
    +{ \
    + return applesmc_show_fan_speed(dev, buf, FAN_MAX_SPEED, offset); \
    +} \
    +static DEVICE_ATTR(fan##offset##_maximum_speed, S_IRUGO, \
    + show_fan_maximum_speed_##offset, NULL); \
    +\
    +static ssize_t show_fan_safe_speed_##offset (struct device *dev, \
    + struct device_attribute *attr, char *buf) \
    +{ \
    + return applesmc_show_fan_speed(dev, buf, FAN_SAFE_SPEED, offset); \
    +} \
    +static DEVICE_ATTR(fan##offset##_safe_speed, S_IRUGO, \
    + show_fan_safe_speed_##offset, NULL); \
    +\
    +static ssize_t show_fan_target_speed_##offset (struct device *dev, \
    + struct device_attribute *attr, char *buf) \
    +{ \
    + return applesmc_show_fan_speed(dev, buf, FAN_TARGET_SPEED, offset); \
    +} \
    +static ssize_t store_fan_target_speed_##offset (struct device *dev, \
    + struct device_attribute *attr, const char *buf, size_t count) \
    +{ \
    + return applesmc_store_fan_speed(dev, buf, count, FAN_TARGET_SPEED, offset); \
    +} \
    +static DEVICE_ATTR(fan##offset##_target_speed, S_IRUGO | S_IWUSR, \
    + show_fan_target_speed_##offset, store_fan_target_speed_##offset); \
    +static ssize_t show_fan_manual_##offset (struct device *dev, \
    + struct device_attribute *attr, char *buf) \
    +{ \
    + return applesmc_show_fan_manual(dev, buf, offset); \
    +} \
    +static ssize_t store_fan_manual_##offset (struct device *dev, \
    + struct device_attribute *attr, const char *buf, size_t count) \
    +{ \
    + return applesmc_store_fan_manual(dev, buf, count, offset); \
    +} \
    +static DEVICE_ATTR(fan##offset##_manual, S_IRUGO | S_IWUSR, \
    + show_fan_manual_##offset, store_fan_manual_##offset);
    +
    +/*
    + * Create the needed functions for each fan using the macro defined above
    + * (2 fans are supported)
    + */
    +sysfs_fan_speeds_offset(0);
    +sysfs_fan_speeds_offset(1);
    +
    +/* Macro creating the sysfs entries for a fan */
    +#define device_create_file_fan(ret, client, offset) \
    +do { \
    +ret = sysfs_create_file(client, &dev_attr_fan##offset##_actual_speed.attr); \
    +if (ret) break; \
    +ret = sysfs_create_file(client, &dev_attr_fan##offset##_minimum_speed.attr); \
    +if (ret) break; \
    +ret = sysfs_create_file(client, &dev_attr_fan##offset##_maximum_speed.attr); \
    +if (ret) break; \
    +ret = sysfs_create_file(client, &dev_attr_fan##offset##_safe_speed.attr); \
    +if (ret) break; \
    +ret = sysfs_create_file(client, &dev_attr_fan##offset##_target_speed.attr); \
    +if (ret) break; \
    +ret = sysfs_create_file(client, &dev_attr_fan##offset##_manual.attr); \
    +} while (0)
    +
    +/*
    + * Macro defining the helper function and DEVICE_ATTR for a temperature sensor
    + * sysfs entry.
    + */
    +#define sysfs_temperature_offset(offset) \
    +static ssize_t show_temperature_##offset (struct device *dev, \
    + struct device_attribute *attr, char *buf) \
    +{ \
    + return applesmc_show_temperature(dev, buf, \
    + temperature_sensors_sets[applesmc_temperature_set][offset]); \
    +} \
    +static DEVICE_ATTR(temperature_##offset, S_IRUGO, \
    + show_temperature_##offset, NULL);
    +
    +/*
    + * Create the needed functions for each temperature sensors using the macro
    + * defined above (7 temperature sensors are supported)
    + */
    +sysfs_temperature_offset(0);
    +sysfs_temperature_offset(1);
    +sysfs_temperature_offset(2);
    +sysfs_temperature_offset(3);
    +sysfs_temperature_offset(4);
    +sysfs_temperature_offset(5);
    +sysfs_temperature_offset(6);
    +
    +/* Macro creating the sysfs entry for a temperature sensor */
    +#define device_create_files_temperature(ret, client, offset) \
    +{ \
    + ret = sysfs_create_file(client, &dev_attr_temperature_##offset.attr); \
    +} while (0)
    +
    +/* Module stuff */
    +
    +/*
    + * applesmc_dmi_match - found a match. return one, short-circuiting the hunt.
    + */
    +static int applesmc_dmi_match(struct dmi_system_id *id)
    +{
    + int i = 0;
    + struct dmi_match_data* dmi_data =
    + (struct dmi_match_data*)id->driver_data;
    + printk(KERN_INFO "applesmc: %s detected:\n", id->ident);
    + applesmc_accelerometer = dmi_data->accelerometer;
    + printk(KERN_INFO "applesmc: - Model %s accelerometer\n",
    + applesmc_accelerometer ? "with" : "without");
    + applesmc_light = dmi_data->light;
    + printk(KERN_INFO "applesmc: - Model %s light sensors and backlight\n",
    + applesmc_light ? "with" : "without");
    +
    + applesmc_temperature_set = dmi_data->temperature_set;
    + while (temperature_sensors_sets[applesmc_temperature_set][i] != NULL)
    + i++;
    + printk(KERN_INFO "applesmc: - Model with %d temperature sensors\n", i);
    + return 1;
    +}
    +
    +/* Create accelerometer ressources */
    +static int applesmc_create_accelerometer(void) {
    + int ret;
    +
    + ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_position.attr);
    + if (ret)
    + goto out;
    +
    + ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_calibrate.attr);
    + if (ret)
    + goto out;
    +
    + applesmc_idev = input_allocate_device();
    + if (!applesmc_idev) {
    + ret = -ENOMEM;
    + goto out;
    + }
    +
    + /* initial calibrate for the input device */
    + applesmc_calibrate();
    +
    + /* initialize the input class */
    + applesmc_idev->name = "applesmc";
    + applesmc_idev->cdev.dev = &pdev->dev;
    + applesmc_idev->evbit[0] = BIT(EV_ABS);
    + 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);
    +
    + input_register_device(applesmc_idev);
    +
    + /* start up our timer for the input device */
    + init_timer(&applesmc_timer);
    + applesmc_timer.function = applesmc_mousedev_poll;
    + applesmc_timer.expires = jiffies + APPLESMC_POLL_PERIOD;
    + add_timer(&applesmc_timer);
    +
    + return 0;
    +
    +out:
    + printk(KERN_WARNING "applesmc: driver init failed (ret=%d)!\n", ret);
    + return ret;
    +}
    +
    +/* Release all ressources used by the accelerometer */
    +static void applesmc_release_accelerometer(void) {
    + del_timer_sync(&applesmc_timer);
    + input_unregister_device(applesmc_idev);
    +}
    +
    +static int __init applesmc_init(void)
    +{
    + int ret;
    + int count;
    +
    + struct dmi_match_data applesmc_dmi_data[] = {
    + /* MacBook Pro: accelerometer, backlight and temperature set 0 */
    + { .accelerometer = 1, .light = 1, .temperature_set = 0 },
    + /* MacBook: accelerometer and temperature set 0 */
    + { .accelerometer = 1, .light = 0, .temperature_set = 0 },
    + /* MacBook: temperature set 1 */
    + { .accelerometer = 0, .light = 0, .temperature_set = 1 }
    + };
    +
    + /* Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
    + * So we need to put "Apple MacBook Pro" before "Apple MacBook". */
    + struct dmi_system_id applesmc_whitelist[] = {
    + { applesmc_dmi_match, "Apple MacBook Pro", {
    + DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
    + DMI_MATCH(DMI_PRODUCT_NAME,"MacBookPro") },
    + (void*)&applesmc_dmi_data[0]},
    + { applesmc_dmi_match, "Apple MacBook", {
    + DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
    + DMI_MATCH(DMI_PRODUCT_NAME,"MacBook") },
    + (void*)&applesmc_dmi_data[1]},
    + { applesmc_dmi_match, "Apple Macmini", {
    + DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
    + DMI_MATCH(DMI_PRODUCT_NAME,"Macmini") },
    + (void*)&applesmc_dmi_data[2]},
    + { .ident = NULL }
    + };
    +
    + if (!dmi_check_system(applesmc_whitelist)) {
    + printk(KERN_WARNING "applesmc: 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", -1, NULL, 0);
    + if (IS_ERR(pdev)) {
    + ret = PTR_ERR(pdev);
    + goto out_driver;
    + }
    +
    + /* create fan files */
    + count = applesmc_get_fan_count();
    + if (count < 0) {
    + printk(KERN_ERR "applesmc: Cannot get the number of fans.\n");
    + }
    + else {
    + printk(KERN_INFO "applesmc: %d fans found.\n", count);
    +
    + switch (count) {
    + default:
    + printk(KERN_WARNING "applesmc: More than 2 fans found,"
    + " but at most 2 fans are supported"
    + " by the driver.\n");
    + case 2:
    + device_create_file_fan(ret, &pdev->dev.kobj, 1);
    + if (ret)
    + goto out_device;
    + case 1:
    + device_create_file_fan(ret, &pdev->dev.kobj, 0);
    + if (ret)
    + goto out_device;
    + case 0:
    + ;
    + }
    + }
    +
    + count = 0;
    + while (temperature_sensors_sets[applesmc_temperature_set][count]
    + != NULL)
    + count++;
    +
    + switch (count) {
    + default:
    + case 7:
    + device_create_files_temperature(ret, &pdev->dev.kobj, 6);
    + if (ret)
    + goto out_device;
    + case 6:
    + device_create_files_temperature(ret, &pdev->dev.kobj, 5);
    + if (ret)
    + goto out_device;
    + case 5:
    + device_create_files_temperature(ret, &pdev->dev.kobj, 4);
    + if (ret)
    + goto out_device;
    + case 4:
    + device_create_files_temperature(ret, &pdev->dev.kobj, 3);
    + if (ret)
    + goto out_device;
    + case 3:
    + device_create_files_temperature(ret, &pdev->dev.kobj, 2);
    + if (ret)
    + goto out_device;
    + case 2:
    + device_create_files_temperature(ret, &pdev->dev.kobj, 1);
    + if (ret)
    + goto out_device;
    + case 1:
    + device_create_files_temperature(ret, &pdev->dev.kobj, 0);
    + if (ret)
    + goto out_device;
    + case 0:
    + ;
    + }
    +
    + if (applesmc_accelerometer) {
    + ret = applesmc_create_accelerometer();
    + if (ret)
    + goto out_device;
    + }
    +
    + if (applesmc_light) {
    + /* Add light sensor file */
    + ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_light.attr);
    + if (ret)
    + goto out_accelerometer;
    +
    + /* register as a led device */
    + ret = led_classdev_register(&pdev->dev, &applesmc_backlight);
    + if (ret < 0)
    + goto out_accelerometer;
    + }
    +
    + printk(KERN_INFO "applesmc: driver successfully loaded.\n");
    + return 0;
    +
    +out_accelerometer:
    + if (applesmc_accelerometer)
    + applesmc_release_accelerometer();
    +out_device:
    + platform_device_unregister(pdev);
    +out_driver:
    + platform_driver_unregister(&applesmc_driver);
    +out_region:
    + release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
    +out:
    + printk(KERN_WARNING "applesmc: driver init failed (ret=%d)!\n", ret);
    + return ret;
    +}
    +
    +static void __exit applesmc_exit(void)
    +{
    + if (applesmc_light)
    + led_classdev_unregister(&applesmc_backlight);
    + if (applesmc_accelerometer)
    + applesmc_release_accelerometer();
    + platform_device_unregister(pdev);
    + platform_driver_unregister(&applesmc_driver);
    + release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
    +
    + printk(KERN_INFO "applesmc: driver unloaded.\n");
    +}
    +
    +module_init(applesmc_init);
    +module_exit(applesmc_exit);
    +
    +MODULE_AUTHOR("Nicolas Boichat");
    +MODULE_DESCRIPTION("Apple SMC");
    +MODULE_LICENSE("GPL v2");

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