[deliverable/linux.git] / drivers / char / i8k.c

/*
 * i8k.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
 *	    See http://www.debian.org/~dz/i8k/ for more information
 *	    and for latest version of this driver.
 *
 * Copyright (C) 2001  Massimo Dal Zotto <dz@debian.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/dmi.h>
#include <linux/capability.h>
#include <asm/uaccess.h>
#include <asm/io.h>

#include <linux/i8k.h>

#define I8K_VERSION		"1.14 21/02/2005"

#define I8K_SMM_FN_STATUS	0x0025
#define I8K_SMM_POWER_STATUS	0x0069
#define I8K_SMM_SET_FAN		0x01a3
#define I8K_SMM_GET_FAN		0x00a3
#define I8K_SMM_GET_SPEED	0x02a3
#define I8K_SMM_GET_TEMP	0x10a3
#define I8K_SMM_GET_DELL_SIG1	0xfea3
#define I8K_SMM_GET_DELL_SIG2	0xffa3
#define I8K_SMM_BIOS_VERSION	0x00a6

#define I8K_FAN_MULT		30
#define I8K_MAX_TEMP		127

#define I8K_FN_NONE		0x00
#define I8K_FN_UP		0x01
#define I8K_FN_DOWN		0x02
#define I8K_FN_MUTE		0x04
#define I8K_FN_MASK		0x07
#define I8K_FN_SHIFT		8

#define I8K_POWER_AC		0x05
#define I8K_POWER_BATTERY	0x01

#define I8K_TEMPERATURE_BUG	1

static char bios_version[4];

MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
MODULE_LICENSE("GPL");

static int force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force, "Force loading without checking for supported models");

static int ignore_dmi;
module_param(ignore_dmi, bool, 0);
MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");

static int restricted;
module_param(restricted, bool, 0);
MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");

static int power_status;
module_param(power_status, bool, 0600);
MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");

static int i8k_open_fs(struct inode *inode, struct file *file);
static int i8k_ioctl(struct inode *, struct file *, unsigned int,
		     unsigned long);

static const struct file_operations i8k_fops = {
	.open		= i8k_open_fs,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.ioctl		= i8k_ioctl,
};

struct smm_regs {
	unsigned int eax;
	unsigned int ebx __attribute__ ((packed));
	unsigned int ecx __attribute__ ((packed));
	unsigned int edx __attribute__ ((packed));
	unsigned int esi __attribute__ ((packed));
	unsigned int edi __attribute__ ((packed));
};

static inline char *i8k_get_dmi_data(int field)
{
	char *dmi_data = dmi_get_system_info(field);

	return dmi_data && *dmi_data ? dmi_data : "?";
}

/*
 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
 */
static int i8k_smm(struct smm_regs *regs)
{
	int rc;
	int eax = regs->eax;

	asm("pushl %%eax\n\t"
	    "movl 0(%%eax),%%edx\n\t"
	    "push %%edx\n\t"
	    "movl 4(%%eax),%%ebx\n\t"
	    "movl 8(%%eax),%%ecx\n\t"
	    "movl 12(%%eax),%%edx\n\t"
	    "movl 16(%%eax),%%esi\n\t"
	    "movl 20(%%eax),%%edi\n\t"
	    "popl %%eax\n\t"
	    "out %%al,$0xb2\n\t"
	    "out %%al,$0x84\n\t"
	    "xchgl %%eax,(%%esp)\n\t"
	    "movl %%ebx,4(%%eax)\n\t"
	    "movl %%ecx,8(%%eax)\n\t"
	    "movl %%edx,12(%%eax)\n\t"
	    "movl %%esi,16(%%eax)\n\t"
	    "movl %%edi,20(%%eax)\n\t"
	    "popl %%edx\n\t"
	    "movl %%edx,0(%%eax)\n\t"
	    "lahf\n\t"
	    "shrl $8,%%eax\n\t"
	    "andl $1,%%eax\n":"=a"(rc)
	    :    "a"(regs)
	    :    "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");

	if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
		return -EINVAL;

	return 0;
}

/*
 * Read the bios version. Return the version as an integer corresponding
 * to the ascii value, for example "A17" is returned as 0x00413137.
 */
static int i8k_get_bios_version(void)
{
	struct smm_regs regs = { .eax = I8K_SMM_BIOS_VERSION, };

	return i8k_smm(&regs) ? : regs.eax;
}

/*
 * Read the Fn key status.
 */
static int i8k_get_fn_status(void)
{
	struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
	int rc;

	if ((rc = i8k_smm(&regs)) < 0)
		return rc;

	switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
	case I8K_FN_UP:
		return I8K_VOL_UP;
	case I8K_FN_DOWN:
		return I8K_VOL_DOWN;
	case I8K_FN_MUTE:
		return I8K_VOL_MUTE;
	default:
		return 0;
	}
}

/*
 * Read the power status.
 */
static int i8k_get_power_status(void)
{
	struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
	int rc;

	if ((rc = i8k_smm(&regs)) < 0)
		return rc;

	return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
}

/*
 * Read the fan status.
 */
static int i8k_get_fan_status(int fan)
{
	struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };

	regs.ebx = fan & 0xff;
	return i8k_smm(&regs) ? : regs.eax & 0xff;
}

/*
 * Read the fan speed in RPM.
 */
static int i8k_get_fan_speed(int fan)
{
	struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };

	regs.ebx = fan & 0xff;
	return i8k_smm(&regs) ? : (regs.eax & 0xffff) * I8K_FAN_MULT;
}

/*
 * Set the fan speed (off, low, high). Returns the new fan status.
 */
static int i8k_set_fan(int fan, int speed)
{
	struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };

	speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
	regs.ebx = (fan & 0xff) | (speed << 8);

	return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
}

/*
 * Read the cpu temperature.
 */
static int i8k_get_temp(int sensor)
{
	struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
	int rc;
	int temp;

#ifdef I8K_TEMPERATURE_BUG
	static int prev;
#endif
	regs.ebx = sensor & 0xff;
	if ((rc = i8k_smm(&regs)) < 0)
		return rc;

	temp = regs.eax & 0xff;

#ifdef I8K_TEMPERATURE_BUG
	/*
	 * Sometimes the temperature sensor returns 0x99, which is out of range.
	 * In this case we return (once) the previous cached value. For example:
	 # 1003655137 00000058 00005a4b
	 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
	 # 1003655139 00000054 00005c52
	 */
	if (temp > I8K_MAX_TEMP) {
		temp = prev;
		prev = I8K_MAX_TEMP;
	} else {
		prev = temp;
	}
#endif

	return temp;
}

static int i8k_get_dell_signature(int req_fn)
{
	struct smm_regs regs = { .eax = req_fn, };
	int rc;

	if ((rc = i8k_smm(&regs)) < 0)
		return rc;

	return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
}

static int i8k_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
		     unsigned long arg)
{
	int val = 0;
	int speed;
	unsigned char buff[16];
	int __user *argp = (int __user *)arg;

	if (!argp)
		return -EINVAL;

	switch (cmd) {
	case I8K_BIOS_VERSION:
		val = i8k_get_bios_version();
		break;

	case I8K_MACHINE_ID:
		memset(buff, 0, 16);
		strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), sizeof(buff));
		break;

	case I8K_FN_STATUS:
		val = i8k_get_fn_status();
		break;

	case I8K_POWER_STATUS:
		val = i8k_get_power_status();
		break;

	case I8K_GET_TEMP:
		val = i8k_get_temp(0);
		break;

	case I8K_GET_SPEED:
		if (copy_from_user(&val, argp, sizeof(int)))
			return -EFAULT;

		val = i8k_get_fan_speed(val);
		break;

	case I8K_GET_FAN:
		if (copy_from_user(&val, argp, sizeof(int)))
			return -EFAULT;

		val = i8k_get_fan_status(val);
		break;

	case I8K_SET_FAN:
		if (restricted && !capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (copy_from_user(&val, argp, sizeof(int)))
			return -EFAULT;

		if (copy_from_user(&speed, argp + 1, sizeof(int)))
			return -EFAULT;

		val = i8k_set_fan(val, speed);
		break;

	default:
		return -EINVAL;
	}

	if (val < 0)
		return val;

	switch (cmd) {
	case I8K_BIOS_VERSION:
		if (copy_to_user(argp, &val, 4))
			return -EFAULT;

		break;
	case I8K_MACHINE_ID:
		if (copy_to_user(argp, buff, 16))
			return -EFAULT;

		break;
	default:
		if (copy_to_user(argp, &val, sizeof(int)))
			return -EFAULT;

		break;
	}

	return 0;
}

/*
 * Print the information for /proc/i8k.
 */
static int i8k_proc_show(struct seq_file *seq, void *offset)
{
	int fn_key, cpu_temp, ac_power;
	int left_fan, right_fan, left_speed, right_speed;
Commit	Line	Data
1da177e4 LT	1	/*
	2	* i8k.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
	3	* See http://www.debian.org/~dz/i8k/ for more information
	4	* and for latest version of this driver.
	5	*
	6	* Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2, or (at your option) any
	11	* later version.
	12	*
	13	* This program is distributed in the hope that it will be useful, but
	14	* WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* General Public License for more details.
	17	*/
	18
	19	#include <linux/module.h>
	20	#include <linux/types.h>
	21	#include <linux/init.h>
	22	#include <linux/proc_fs.h>
352f8f8b	23	#include <linux/seq_file.h>
e70c9d5e	24	#include <linux/dmi.h>
7e80d0d0	25	#include <linux/capability.h>
1da177e4 LT	26	#include <asm/uaccess.h>
	27	#include <asm/io.h>
	28
	29	#include <linux/i8k.h>
	30
352f8f8b	31	#define I8K_VERSION "1.14 21/02/2005"
1da177e4 LT	32
	33	#define I8K_SMM_FN_STATUS 0x0025
	34	#define I8K_SMM_POWER_STATUS 0x0069
	35	#define I8K_SMM_SET_FAN 0x01a3
	36	#define I8K_SMM_GET_FAN 0x00a3
	37	#define I8K_SMM_GET_SPEED 0x02a3
	38	#define I8K_SMM_GET_TEMP 0x10a3
7e0fa31d DT	39	#define I8K_SMM_GET_DELL_SIG1 0xfea3
7e0fa31d DT	40	#define I8K_SMM_GET_DELL_SIG2 0xffa3
1da177e4 LT	41	#define I8K_SMM_BIOS_VERSION 0x00a6
	42
	43	#define I8K_FAN_MULT 30
	44	#define I8K_MAX_TEMP 127
	45
	46	#define I8K_FN_NONE 0x00
	47	#define I8K_FN_UP 0x01
	48	#define I8K_FN_DOWN 0x02
	49	#define I8K_FN_MUTE 0x04
	50	#define I8K_FN_MASK 0x07
	51	#define I8K_FN_SHIFT 8
	52
	53	#define I8K_POWER_AC 0x05
	54	#define I8K_POWER_BATTERY 0x01
	55
	56	#define I8K_TEMPERATURE_BUG 1
	57
e70c9d5e	58	static char bios_version[4];
1da177e4 LT	59
	60	MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
	61	MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
	62	MODULE_LICENSE("GPL");
	63
	64	static int force;
	65	module_param(force, bool, 0);
	66	MODULE_PARM_DESC(force, "Force loading without checking for supported models");
	67
e70c9d5e DT	68	static int ignore_dmi;
	69	module_param(ignore_dmi, bool, 0);
	70	MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
	71
1da177e4 LT	72	static int restricted;
	73	module_param(restricted, bool, 0);
	74	MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
	75
	76	static int power_status;
	77	module_param(power_status, bool, 0600);
	78	MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
	79
352f8f8b	80	static int i8k_open_fs(struct inode inode, struct file file);
1da177e4 LT	81	static int i8k_ioctl(struct inode , struct file , unsigned int,
	82	unsigned long);
	83
62322d25	84	static const struct file_operations i8k_fops = {
352f8f8b DT	85	.open = i8k_open_fs,
	86	.read = seq_read,
	87	.llseek = seq_lseek,
	88	.release = single_release,
	89	.ioctl = i8k_ioctl,
1da177e4 LT	90	};
1da177e4 LT	91
8378b924	92	struct smm_regs {
dec63ec3 DT	93	unsigned int eax;
	94	unsigned int ebx __attribute__ ((packed));
	95	unsigned int ecx __attribute__ ((packed));
	96	unsigned int edx __attribute__ ((packed));
	97	unsigned int esi __attribute__ ((packed));
	98	unsigned int edi __attribute__ ((packed));
8378b924	99	};
1da177e4	100
e70c9d5e DT	101	static inline char *i8k_get_dmi_data(int field)
e70c9d5e DT	102	{
4f005551 DT	103	char *dmi_data = dmi_get_system_info(field);
	104
	105	return dmi_data && *dmi_data ? dmi_data : "?";
e70c9d5e	106	}
1da177e4 LT	107
	108	/*
	109	* Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
	110	*/
8378b924	111	static int i8k_smm(struct smm_regs *regs)
1da177e4	112	{
dec63ec3 DT	113	int rc;
	114	int eax = regs->eax;
	115
	116	asm("pushl %%eax\n\t"
	117	"movl 0(%%eax),%%edx\n\t"
	118	"push %%edx\n\t"
	119	"movl 4(%%eax),%%ebx\n\t"
	120	"movl 8(%%eax),%%ecx\n\t"
	121	"movl 12(%%eax),%%edx\n\t"
	122	"movl 16(%%eax),%%esi\n\t"
	123	"movl 20(%%eax),%%edi\n\t"
	124	"popl %%eax\n\t"
	125	"out %%al,$0xb2\n\t"
	126	"out %%al,$0x84\n\t"
	127	"xchgl %%eax,(%%esp)\n\t"
	128	"movl %%ebx,4(%%eax)\n\t"
	129	"movl %%ecx,8(%%eax)\n\t"
	130	"movl %%edx,12(%%eax)\n\t"
	131	"movl %%esi,16(%%eax)\n\t"
	132	"movl %%edi,20(%%eax)\n\t"
	133	"popl %%edx\n\t"
	134	"movl %%edx,0(%%eax)\n\t"
	135	"lahf\n\t"
	136	"shrl $8,%%eax\n\t"
	137	"andl $1,%%eax\n":"=a"(rc)
	138	: "a"(regs)
	139	: "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
	140
8378b924	141	if (rc != 0 \|\| (regs->eax & 0xffff) == 0xffff \|\| regs->eax == eax)
dec63ec3	142	return -EINVAL;
dec63ec3 DT	143
dec63ec3 DT	144	return 0;
1da177e4 LT	145	}
	146
	147	/*
	148	* Read the bios version. Return the version as an integer corresponding
	149	* to the ascii value, for example "A17" is returned as 0x00413137.
	150	*/
	151	static int i8k_get_bios_version(void)
	152	{
8378b924	153	struct smm_regs regs = { .eax = I8K_SMM_BIOS_VERSION, };
1da177e4	154
8378b924	155	return i8k_smm(&regs) ? : regs.eax;
1da177e4 LT	156	}
1da177e4 LT	157
1da177e4 LT	158	/*
	159	* Read the Fn key status.
	160	*/
	161	static int i8k_get_fn_status(void)
	162	{
8378b924	163	struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
dec63ec3 DT	164	int rc;
dec63ec3 DT	165
8378b924	166	if ((rc = i8k_smm(&regs)) < 0)
dec63ec3	167	return rc;
dec63ec3 DT	168
	169	switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
	170	case I8K_FN_UP:
	171	return I8K_VOL_UP;
	172	case I8K_FN_DOWN:
	173	return I8K_VOL_DOWN;
	174	case I8K_FN_MUTE:
	175	return I8K_VOL_MUTE;
	176	default:
	177	return 0;
	178	}
1da177e4 LT	179	}
	180
	181	/*
	182	* Read the power status.
	183	*/
	184	static int i8k_get_power_status(void)
	185	{
8378b924	186	struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
dec63ec3 DT	187	int rc;
dec63ec3 DT	188
8378b924	189	if ((rc = i8k_smm(&regs)) < 0)
dec63ec3	190	return rc;
dec63ec3	191
8378b924	192	return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
1da177e4 LT	193	}
	194
	195	/*
	196	* Read the fan status.
	197	*/
	198	static int i8k_get_fan_status(int fan)
	199	{
8378b924	200	struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
1da177e4	201
dec63ec3	202	regs.ebx = fan & 0xff;
8378b924	203	return i8k_smm(&regs) ? : regs.eax & 0xff;
1da177e4 LT	204	}
	205
	206	/*
	207	* Read the fan speed in RPM.
	208	*/
	209	static int i8k_get_fan_speed(int fan)
	210	{
8378b924	211	struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
1da177e4	212
dec63ec3	213	regs.ebx = fan & 0xff;
8378b924	214	return i8k_smm(&regs) ? : (regs.eax & 0xffff) * I8K_FAN_MULT;
1da177e4 LT	215	}
	216
	217	/*
	218	* Set the fan speed (off, low, high). Returns the new fan status.
	219	*/
	220	static int i8k_set_fan(int fan, int speed)
	221	{
8378b924	222	struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
1da177e4	223
dec63ec3	224	speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
dec63ec3	225	regs.ebx = (fan & 0xff) \| (speed << 8);
1da177e4	226
8378b924	227	return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
1da177e4 LT	228	}
	229
	230	/*
	231	* Read the cpu temperature.
	232	*/
7e0fa31d	233	static int i8k_get_temp(int sensor)
1da177e4	234	{
8378b924	235	struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
dec63ec3 DT	236	int rc;
dec63ec3 DT	237	int temp;
1da177e4 LT	238
1da177e4 LT	239	#ifdef I8K_TEMPERATURE_BUG
8378b924	240	static int prev;
1da177e4	241	#endif
7e0fa31d	242	regs.ebx = sensor & 0xff;
8378b924	243	if ((rc = i8k_smm(&regs)) < 0)
dec63ec3	244	return rc;
8378b924	245
dec63ec3	246	temp = regs.eax & 0xff;
1da177e4 LT	247
1da177e4 LT	248	#ifdef I8K_TEMPERATURE_BUG
dec63ec3 DT	249	/*
	250	* Sometimes the temperature sensor returns 0x99, which is out of range.
	251	* In this case we return (once) the previous cached value. For example:
	252	# 1003655137 00000058 00005a4b
	253	# 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
	254	# 1003655139 00000054 00005c52
	255	*/
	256	if (temp > I8K_MAX_TEMP) {
	257	temp = prev;
	258	prev = I8K_MAX_TEMP;
	259	} else {
	260	prev = temp;
	261	}
1da177e4 LT	262	#endif
1da177e4 LT	263
dec63ec3	264	return temp;
1da177e4 LT	265	}
1da177e4 LT	266
7e0fa31d	267	static int i8k_get_dell_signature(int req_fn)
1da177e4	268	{
7e0fa31d	269	struct smm_regs regs = { .eax = req_fn, };
dec63ec3	270	int rc;
1da177e4	271
8378b924	272	if ((rc = i8k_smm(&regs)) < 0)
dec63ec3	273	return rc;
1da177e4	274
8378b924	275	return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
1da177e4 LT	276	}
	277
	278	static int i8k_ioctl(struct inode ip, struct file fp, unsigned int cmd,
	279	unsigned long arg)
	280	{
e70c9d5e	281	int val = 0;
dec63ec3 DT	282	int speed;
	283	unsigned char buff[16];
	284	int __user argp = (int __user )arg;
	285
	286	if (!argp)
	287	return -EINVAL;
	288
	289	switch (cmd) {
	290	case I8K_BIOS_VERSION:
	291	val = i8k_get_bios_version();
	292	break;
	293
	294	case I8K_MACHINE_ID:
	295	memset(buff, 0, 16);
e70c9d5e	296	strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), sizeof(buff));
dec63ec3 DT	297	break;
	298
	299	case I8K_FN_STATUS:
	300	val = i8k_get_fn_status();
	301	break;
	302
	303	case I8K_POWER_STATUS:
	304	val = i8k_get_power_status();
	305	break;
	306
	307	case I8K_GET_TEMP:
7e0fa31d	308	val = i8k_get_temp(0);
dec63ec3 DT	309	break;
	310
	311	case I8K_GET_SPEED:
8378b924	312	if (copy_from_user(&val, argp, sizeof(int)))
dec63ec3	313	return -EFAULT;
8378b924	314
dec63ec3 DT	315	val = i8k_get_fan_speed(val);
dec63ec3 DT	316	break;
1da177e4	317
dec63ec3	318	case I8K_GET_FAN:
8378b924	319	if (copy_from_user(&val, argp, sizeof(int)))
dec63ec3	320	return -EFAULT;
8378b924	321
dec63ec3 DT	322	val = i8k_get_fan_status(val);
dec63ec3 DT	323	break;
1da177e4	324
dec63ec3	325	case I8K_SET_FAN:
8378b924	326	if (restricted && !capable(CAP_SYS_ADMIN))
dec63ec3	327	return -EPERM;
8378b924 DT	328
8378b924 DT	329	if (copy_from_user(&val, argp, sizeof(int)))
dec63ec3	330	return -EFAULT;
8378b924 DT	331
8378b924 DT	332	if (copy_from_user(&speed, argp + 1, sizeof(int)))
dec63ec3	333	return -EFAULT;
8378b924	334
dec63ec3 DT	335	val = i8k_set_fan(val, speed);
dec63ec3 DT	336	break;
1da177e4	337
dec63ec3 DT	338	default:
dec63ec3 DT	339	return -EINVAL;
1da177e4	340	}
1da177e4	341
8378b924	342	if (val < 0)
dec63ec3	343	return val;
1da177e4	344
dec63ec3 DT	345	switch (cmd) {
dec63ec3 DT	346	case I8K_BIOS_VERSION:
8378b924	347	if (copy_to_user(argp, &val, 4))
dec63ec3	348	return -EFAULT;
8378b924	349
dec63ec3 DT	350	break;
dec63ec3 DT	351	case I8K_MACHINE_ID:
8378b924	352	if (copy_to_user(argp, buff, 16))
dec63ec3	353	return -EFAULT;
8378b924	354
dec63ec3 DT	355	break;
dec63ec3 DT	356	default:
8378b924	357	if (copy_to_user(argp, &val, sizeof(int)))
dec63ec3	358	return -EFAULT;
8378b924	359
dec63ec3	360	break;
1da177e4	361	}
1da177e4	362
dec63ec3	363	return 0;
1da177e4 LT	364	}
	365
	366	/*
	367	* Print the information for /proc/i8k.
	368	*/
352f8f8b	369	static int i8k_proc_show(struct seq_file seq, void offset)
1da177e4	370	{
352f8f8b	371	int fn_key, cpu_temp, ac_power;
dec63ec3 DT	372	int left_fan, right_fan, left_speed, right_speed;
dec63ec3 DT	373