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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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