[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 <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_SIG	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 struct file_operations i8k_fops = {
	.open		= i8k_open_fs,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.ioctl		= i8k_ioctl,
};

typedef struct {
	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));
} SMMRegisters;

static inline char *i8k_get_dmi_data(int field)
{
	return dmi_get_system_info(field) ? : "N/A";
}

/*
 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
 */
static int i8k_smm(SMMRegisters * 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)
{
	SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
	int rc;

	regs.eax = I8K_SMM_BIOS_VERSION;
	if ((rc = i8k_smm(&regs)) < 0) {
		return rc;
	}

	return regs.eax;
}

/*
 * Read the Fn key status.
 */
static int i8k_get_fn_status(void)
{
	SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
	int rc;

	regs.eax = I8K_SMM_FN_STATUS;
	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)
{
	SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
	int rc;

	regs.eax = I8K_SMM_POWER_STATUS;
	if ((rc = i8k_smm(&regs)) < 0) {
		return rc;
	}

	switch (regs.eax & 0xff) {
	case I8K_POWER_AC:
		return I8K_AC;
	default:
		return I8K_BATTERY;
	}
}

/*
 * Read the fan status.
 */
static int i8k_get_fan_status(int fan)
{
	SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
	int rc;

	regs.eax = I8K_SMM_GET_FAN;
	regs.ebx = fan & 0xff;
	if ((rc = i8k_smm(&regs)) < 0) {
		return rc;
	}

	return (regs.eax & 0xff);
}

/*
 * Read the fan speed in RPM.
 */
static int i8k_get_fan_speed(int fan)
{
	SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
	int rc;

	regs.eax = I8K_SMM_GET_SPEED;
	regs.ebx = fan & 0xff;
	if ((rc = i8k_smm(&regs)) < 0) {
		return rc;
	}

	return (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)
{
	SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
	int rc;

	speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);

	regs.eax = I8K_SMM_SET_FAN;
	regs.ebx = (fan & 0xff) | (speed << 8);
	if ((rc = i8k_smm(&regs)) < 0) {
		return rc;
	}

	return (i8k_get_fan_status(fan));
}

/*
 * Read the cpu temperature.
 */
static int i8k_get_cpu_temp(void)
{
	SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
	int rc;
	int temp;

#ifdef I8K_TEMPERATURE_BUG
	static int prev = 0;
#endif

	regs.eax = I8K_SMM_GET_TEMP;
	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(void)
{
	SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
	int rc;

	regs.eax = I8K_SMM_GET_DELL_SIG;
	if ((rc = i8k_smm(&regs)) < 0) {
		return rc;
	}

	if ((regs.eax == 1145651527) && (regs.edx == 1145392204)) {
		return 0;
	} else {
		return -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_cpu_temp();
		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>
1da177e4 LT	25	#include <asm/uaccess.h>
	26	#include <asm/io.h>
	27
	28	#include <linux/i8k.h>
	29
352f8f8b	30	#define I8K_VERSION "1.14 21/02/2005"
1da177e4 LT	31
	32	#define I8K_SMM_FN_STATUS 0x0025
	33	#define I8K_SMM_POWER_STATUS 0x0069
	34	#define I8K_SMM_SET_FAN 0x01a3
	35	#define I8K_SMM_GET_FAN 0x00a3
	36	#define I8K_SMM_GET_SPEED 0x02a3
	37	#define I8K_SMM_GET_TEMP 0x10a3
	38	#define I8K_SMM_GET_DELL_SIG 0xffa3
	39	#define I8K_SMM_BIOS_VERSION 0x00a6
	40
	41	#define I8K_FAN_MULT 30
	42	#define I8K_MAX_TEMP 127
	43
	44	#define I8K_FN_NONE 0x00
	45	#define I8K_FN_UP 0x01
	46	#define I8K_FN_DOWN 0x02
	47	#define I8K_FN_MUTE 0x04
	48	#define I8K_FN_MASK 0x07
	49	#define I8K_FN_SHIFT 8
	50
	51	#define I8K_POWER_AC 0x05
	52	#define I8K_POWER_BATTERY 0x01
	53
	54	#define I8K_TEMPERATURE_BUG 1
	55
e70c9d5e	56	static char bios_version[4];
1da177e4 LT	57
	58	MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
	59	MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
	60	MODULE_LICENSE("GPL");
	61
	62	static int force;
	63	module_param(force, bool, 0);
	64	MODULE_PARM_DESC(force, "Force loading without checking for supported models");
	65
e70c9d5e DT	66	static int ignore_dmi;
	67	module_param(ignore_dmi, bool, 0);
	68	MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
	69
1da177e4 LT	70	static int restricted;
	71	module_param(restricted, bool, 0);
	72	MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
	73
	74	static int power_status;
	75	module_param(power_status, bool, 0600);
	76	MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
	77
352f8f8b	78	static int i8k_open_fs(struct inode inode, struct file file);
1da177e4 LT	79	static int i8k_ioctl(struct inode , struct file , unsigned int,
	80	unsigned long);
	81
	82	static struct file_operations i8k_fops = {
352f8f8b DT	83	.open = i8k_open_fs,
	84	.read = seq_read,
	85	.llseek = seq_lseek,
	86	.release = single_release,
	87	.ioctl = i8k_ioctl,
1da177e4 LT	88	};
	89
	90	typedef struct {
dec63ec3 DT	91	unsigned int eax;
	92	unsigned int ebx __attribute__ ((packed));
	93	unsigned int ecx __attribute__ ((packed));
	94	unsigned int edx __attribute__ ((packed));
	95	unsigned int esi __attribute__ ((packed));
	96	unsigned int edi __attribute__ ((packed));
1da177e4 LT	97	} SMMRegisters;
1da177e4 LT	98
e70c9d5e DT	99	static inline char *i8k_get_dmi_data(int field)
	100	{
	101	return dmi_get_system_info(field) ? : "N/A";
	102	}
1da177e4 LT	103
	104	/*
	105	* Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
	106	*/
dec63ec3	107	static int i8k_smm(SMMRegisters * regs)
1da177e4	108	{
dec63ec3 DT	109	int rc;
	110	int eax = regs->eax;
	111
	112	asm("pushl %%eax\n\t"
	113	"movl 0(%%eax),%%edx\n\t"
	114	"push %%edx\n\t"
	115	"movl 4(%%eax),%%ebx\n\t"
	116	"movl 8(%%eax),%%ecx\n\t"
	117	"movl 12(%%eax),%%edx\n\t"
	118	"movl 16(%%eax),%%esi\n\t"
	119	"movl 20(%%eax),%%edi\n\t"
	120	"popl %%eax\n\t"
	121	"out %%al,$0xb2\n\t"
	122	"out %%al,$0x84\n\t"
	123	"xchgl %%eax,(%%esp)\n\t"
	124	"movl %%ebx,4(%%eax)\n\t"
	125	"movl %%ecx,8(%%eax)\n\t"
	126	"movl %%edx,12(%%eax)\n\t"
	127	"movl %%esi,16(%%eax)\n\t"
	128	"movl %%edi,20(%%eax)\n\t"
	129	"popl %%edx\n\t"
	130	"movl %%edx,0(%%eax)\n\t"
	131	"lahf\n\t"
	132	"shrl $8,%%eax\n\t"
	133	"andl $1,%%eax\n":"=a"(rc)
	134	: "a"(regs)
	135	: "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
	136
	137	if ((rc != 0) \|\| ((regs->eax & 0xffff) == 0xffff) \|\| (regs->eax == eax)) {
	138	return -EINVAL;
	139	}
	140
	141	return 0;
1da177e4 LT	142	}
	143
	144	/*
	145	* Read the bios version. Return the version as an integer corresponding
	146	* to the ascii value, for example "A17" is returned as 0x00413137.
	147	*/
	148	static int i8k_get_bios_version(void)
	149	{
dec63ec3 DT	150	SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
dec63ec3 DT	151	int rc;
1da177e4	152
dec63ec3 DT	153	regs.eax = I8K_SMM_BIOS_VERSION;
	154	if ((rc = i8k_smm(&regs)) < 0) {
	155	return rc;
	156	}
1da177e4	157
dec63ec3	158	return regs.eax;
1da177e4 LT	159	}
1da177e4 LT	160
1da177e4 LT	161	/*
	162	* Read the Fn key status.
	163	*/
	164	static int i8k_get_fn_status(void)
	165	{
dec63ec3 DT	166	SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
	167	int rc;
	168
	169	regs.eax = I8K_SMM_FN_STATUS;
	170	if ((rc = i8k_smm(&regs)) < 0) {
	171	return rc;
	172	}
	173
	174	switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
	175	case I8K_FN_UP:
	176	return I8K_VOL_UP;
	177	case I8K_FN_DOWN:
	178	return I8K_VOL_DOWN;
	179	case I8K_FN_MUTE:
	180	return I8K_VOL_MUTE;
	181	default:
	182	return 0;
	183	}
1da177e4 LT	184	}
	185
	186	/*
	187	* Read the power status.
	188	*/
	189	static int i8k_get_power_status(void)
	190	{
dec63ec3 DT	191	SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
	192	int rc;
	193
	194	regs.eax = I8K_SMM_POWER_STATUS;
	195	if ((rc = i8k_smm(&regs)) < 0) {
	196	return rc;
	197	}
	198
	199	switch (regs.eax & 0xff) {
	200	case I8K_POWER_AC:
	201	return I8K_AC;
	202	default:
	203	return I8K_BATTERY;
	204	}
1da177e4 LT	205	}
	206
	207	/*
	208	* Read the fan status.
	209	*/
	210	static int i8k_get_fan_status(int fan)
	211	{
dec63ec3 DT	212	SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
dec63ec3 DT	213	int rc;
1da177e4	214
dec63ec3 DT	215	regs.eax = I8K_SMM_GET_FAN;
	216	regs.ebx = fan & 0xff;
	217	if ((rc = i8k_smm(&regs)) < 0) {
	218	return rc;
	219	}
1da177e4	220
dec63ec3	221	return (regs.eax & 0xff);
1da177e4 LT	222	}
	223
	224	/*
	225	* Read the fan speed in RPM.
	226	*/
	227	static int i8k_get_fan_speed(int fan)
	228	{
dec63ec3 DT	229	SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
dec63ec3 DT	230	int rc;
1da177e4	231
dec63ec3 DT	232	regs.eax = I8K_SMM_GET_SPEED;
	233	regs.ebx = fan & 0xff;
	234	if ((rc = i8k_smm(&regs)) < 0) {
	235	return rc;
	236	}
1da177e4	237
dec63ec3	238	return (regs.eax & 0xffff) * I8K_FAN_MULT;
1da177e4 LT	239	}
	240
	241	/*
	242	* Set the fan speed (off, low, high). Returns the new fan status.
	243	*/
	244	static int i8k_set_fan(int fan, int speed)
	245	{
dec63ec3 DT	246	SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
dec63ec3 DT	247	int rc;
1da177e4	248
dec63ec3	249	speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
1da177e4	250
dec63ec3 DT	251	regs.eax = I8K_SMM_SET_FAN;
	252	regs.ebx = (fan & 0xff) \| (speed << 8);
	253	if ((rc = i8k_smm(&regs)) < 0) {
	254	return rc;
	255	}
1da177e4	256
dec63ec3	257	return (i8k_get_fan_status(fan));
1da177e4 LT	258	}
	259
	260	/*
	261	* Read the cpu temperature.
	262	*/
	263	static int i8k_get_cpu_temp(void)
	264	{
dec63ec3 DT	265	SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
	266	int rc;
	267	int temp;
1da177e4 LT	268
1da177e4 LT	269	#ifdef I8K_TEMPERATURE_BUG
dec63ec3	270	static int prev = 0;
1da177e4 LT	271	#endif
1da177e4 LT	272
dec63ec3 DT	273	regs.eax = I8K_SMM_GET_TEMP;
	274	if ((rc = i8k_smm(&regs)) < 0) {
	275	return rc;
	276	}
	277	temp = regs.eax & 0xff;
1da177e4 LT	278
1da177e4 LT	279	#ifdef I8K_TEMPERATURE_BUG
dec63ec3 DT	280	/*
	281	* Sometimes the temperature sensor returns 0x99, which is out of range.
	282	* In this case we return (once) the previous cached value. For example:
	283	# 1003655137 00000058 00005a4b
	284	# 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
	285	# 1003655139 00000054 00005c52
	286	*/
	287	if (temp > I8K_MAX_TEMP) {
	288	temp = prev;
	289	prev = I8K_MAX_TEMP;
	290	} else {
	291	prev = temp;
	292	}
1da177e4 LT	293	#endif
1da177e4 LT	294
dec63ec3	295	return temp;
1da177e4 LT	296	}
	297
	298	static int i8k_get_dell_signature(void)
	299	{
dec63ec3 DT	300	SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
dec63ec3 DT	301	int rc;
1da177e4	302
dec63ec3 DT	303	regs.eax = I8K_SMM_GET_DELL_SIG;
	304	if ((rc = i8k_smm(&regs)) < 0) {
	305	return rc;
	306	}
1da177e4	307
dec63ec3 DT	308	if ((regs.eax == 1145651527) && (regs.edx == 1145392204)) {
	309	return 0;
	310	} else {
	311	return -1;
	312	}
1da177e4 LT	313	}
	314
	315	static int i8k_ioctl(struct inode ip, struct file fp, unsigned int cmd,
	316	unsigned long arg)
	317	{
e70c9d5e	318	int val = 0;
dec63ec3 DT	319	int speed;
	320	unsigned char buff[16];
	321	int __user argp = (int __user )arg;
	322
	323	if (!argp)
	324	return -EINVAL;
	325
	326	switch (cmd) {
	327	case I8K_BIOS_VERSION:
	328	val = i8k_get_bios_version();
	329	break;
	330
	331	case I8K_MACHINE_ID:
	332	memset(buff, 0, 16);
e70c9d5e	333	strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), sizeof(buff));
dec63ec3 DT	334	break;
	335
	336	case I8K_FN_STATUS:
	337	val = i8k_get_fn_status();
	338	break;
	339
	340	case I8K_POWER_STATUS:
	341	val = i8k_get_power_status();
	342	break;
	343
	344	case I8K_GET_TEMP:
	345	val = i8k_get_cpu_temp();
	346	break;
	347
	348	case I8K_GET_SPEED:
	349	if (copy_from_user(&val, argp, sizeof(int))) {
	350	return -EFAULT;
	351	}
	352	val = i8k_get_fan_speed(val);
	353	break;
1da177e4	354
dec63ec3 DT	355	case I8K_GET_FAN:
	356	if (copy_from_user(&val, argp, sizeof(int))) {
	357	return -EFAULT;
	358	}
	359	val = i8k_get_fan_status(val);
	360	break;
1da177e4	361
dec63ec3 DT	362	case I8K_SET_FAN:
	363	if (restricted && !capable(CAP_SYS_ADMIN)) {
	364	return -EPERM;
	365	}
	366	if (copy_from_user(&val, argp, sizeof(int))) {
	367	return -EFAULT;
	368	}
	369	if (copy_from_user(&speed, argp + 1, sizeof(int))) {
	370	return -EFAULT;
	371	}
	372	val = i8k_set_fan(val, speed);
	373	break;
1da177e4	374
dec63ec3 DT	375	default:
dec63ec3 DT	376	return -EINVAL;
1da177e4	377	}
1da177e4	378
dec63ec3 DT	379	if (val < 0) {
dec63ec3 DT	380	return val;
1da177e4	381	}
1da177e4	382
dec63ec3 DT	383	switch (cmd) {
	384	case I8K_BIOS_VERSION:
	385	if (copy_to_user(argp, &val, 4)) {
	386	return -EFAULT;
	387	}
	388	break;
	389	case I8K_MACHINE_ID:
	390	if (copy_to_user(argp, buff, 16)) {
	391	return -EFAULT;
	392	}
	393	break;
	394	default:
	395	if (copy_to_user(argp, &val, sizeof(int))) {
	396	return -EFAULT;
	397	}
	398	break;
1da177e4	399	}
1da177e4	400
dec63ec3	401	return 0;
1da177e4 LT	402	}
	403
	404	/*
	405	* Print the information for /proc/i8k.
	406	*/
352f8f8b	407	static int i8k_proc_show(struct seq_file seq, void offset)
1da177e4	408	{
352f8f8b	409	int fn_key, cpu_temp, ac_power;
dec63ec3 DT	410	int left_fan, right_fan, left_speed, right_speed;
	411