path: root/drivers/hwmon/applesmc.c

/*
 * 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-polldev.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/dmi.h>
#include <linux/mutex.h>
#include <linux/hwmon-sysfs.h>
#include <asm/io.h>
#include <linux/leds.h>
#include <linux/hwmon.h>
#include <linux/workqueue.h>

/* data port used by Apple SMC */
#define APPLESMC_DATA_PORT	0x300
/* command/status port used by Apple SMC */
#define APPLESMC_CMD_PORT	0x304

#define APPLESMC_NR_PORTS	32 /* 0x300-0x31f */

#define APPLESMC_MAX_DATA_LENGTH 32

#define APPLESMC_STATUS_MASK	0x0f
#define APPLESMC_READ_CMD	0x10
#define APPLESMC_WRITE_CMD	0x11
#define APPLESMC_GET_KEY_BY_INDEX_CMD	0x12
#define APPLESMC_GET_KEY_TYPE_CMD	0x13

#define KEY_COUNT_KEY		"#KEY" /* r-o ui32 */

#define LIGHT_SENSOR_LEFT_KEY	"ALV0" /* r-o {alv (6 bytes) */
#define LIGHT_SENSOR_RIGHT_KEY	"ALV1" /* r-o {alv (6 bytes) */
#define BACKLIGHT_KEY		"LKSB" /* w-o {lkb (2 bytes) */

#define CLAMSHELL_KEY		"MSLD" /* r-o ui8 (unused) */

#define MOTION_SENSOR_X_KEY	"MO_X" /* r-o sp78 (2 bytes) */
#define MOTION_SENSOR_Y_KEY	"MO_Y" /* r-o sp78 (2 bytes) */
#define MOTION_SENSOR_Z_KEY	"MO_Z" /* r-o sp78 (2 bytes) */
#define MOTION_SENSOR_KEY	"MOCN" /* r/w ui16 */

#define FANS_COUNT		"FNum" /* r-o ui8 */
#define FANS_MANUAL		"FS! " /* r-w ui16 */
#define FAN_ACTUAL_SPEED	"F0Ac" /* r-o fpe2 (2 bytes) */
#define FAN_MIN_SPEED		"F0Mn" /* r-o fpe2 (2 bytes) */
#define FAN_MAX_SPEED		"F0Mx" /* r-o fpe2 (2 bytes) */
#define FAN_SAFE_SPEED		"F0Sf" /* r-o fpe2 (2 bytes) */
#define FAN_TARGET_SPEED	"F0Tg" /* r-w fpe2 (2 bytes) */
#define FAN_POSITION		"F0ID" /* r-o char[16] */

/*
 * Temperature sensors keys (sp78 - 2 bytes).
 * First set for Macbook(Pro), second for Macmini.
 */
static const char* temperature_sensors_sets[][13] = {
	{ "TA0P", "TB0T", "TC0D", "TC0P", "TG0H", "TG0P", "TG0T", "Th0H",
	  "Th1H", "Tm0P", "Ts0P", "Ts1P", NULL },
	{ "TC0D", "TC0P", NULL }
};

/* List of keys used to read/write fan speeds */
static const char* fan_speed_keys[] = {
	FAN_ACTUAL_SPEED,
	FAN_MIN_SPEED,
	FAN_MAX_SPEED,
	FAN_SAFE_SPEED,
	FAN_TARGET_SPEED
};

#define INIT_TIMEOUT_MSECS	5000	/* wait up to 5s for device init ... */
#define INIT_WAIT_MSECS		50	/* ... in 50ms increments */

#define APPLESMC_POLL_INTERVAL	50	/* msecs */
#define APPLESMC_INPUT_FUZZ	4	/* input event threshold */
#define APPLESMC_INPUT_FLAT	4

#define SENSOR_X 0
#define SENSOR_Y 1
#define SENSOR_Z 2

/* 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 const int debug;
static struct platform_device *pdev;
static s16 rest_x;
static