Date:	Wed, 14 Mar 2007 17:29:39 +0800
From:	Nicolas Boichat <nicolas@...chat.ch>
To:	linux-kernel@...r.kernel.org
CC:	lm-sensors@...sensors.org, rlove@...ve.org, linux-kernel@...smi.ch
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@...chat.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@...chat.ch>
+ *
+ * Based on hdaps.c driver:
+ * Copyright (C) 2005 Robert Love <rml@...ell.com>
+ * Copyright (C) 2005 Jesper Juhl <jesper.juhl@...il.com>
+ *
+ * Fan control based on smcFanControl:
+ * Copyright (C) 2006 Hendrik Holtmann <holtmann@....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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