[mirror_ubuntu-bionic-kernel.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,
};

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)
{
	return dmi_get_system_info(field) ? : "N/A";
}

/*
 * 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_cpu_temp(void)
{
	struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
	int rc;
	int temp;

#ifdef I8K_TEMPERATURE_BUG
	static int prev;
#endif

	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)
{
	struct smm_regs regs = { .eax = I8K_SMM_GET_DELL_SIG, };
	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_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	};
1da177e4 LT	89
8378b924	90	struct smm_regs {
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));
8378b924	97	};
1da177e4	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	*/
8378b924	107	static int i8k_smm(struct smm_regs *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
8378b924	137	if (rc != 0 \|\| (regs->eax & 0xffff) == 0xffff \|\| regs->eax == eax)
dec63ec3	138	return -EINVAL;
dec63ec3 DT	139
dec63ec3 DT	140	return 0;
1da177e4 LT	141	}
	142
	143	/*
	144	* Read the bios version. Return the version as an integer corresponding
	145	* to the ascii value, for example "A17" is returned as 0x00413137.
	146	*/
	147	static int i8k_get_bios_version(void)
	148	{
8378b924	149	struct smm_regs regs = { .eax = I8K_SMM_BIOS_VERSION, };
1da177e4	150
8378b924	151	return i8k_smm(&regs) ? : regs.eax;
1da177e4 LT	152	}
1da177e4 LT	153
1da177e4 LT	154	/*
	155	* Read the Fn key status.
	156	*/
	157	static int i8k_get_fn_status(void)
	158	{
8378b924	159	struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
dec63ec3 DT	160	int rc;
dec63ec3 DT	161
8378b924	162	if ((rc = i8k_smm(&regs)) < 0)
dec63ec3	163	return rc;
dec63ec3 DT	164
	165	switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
	166	case I8K_FN_UP:
	167	return I8K_VOL_UP;
	168	case I8K_FN_DOWN:
	169	return I8K_VOL_DOWN;
	170	case I8K_FN_MUTE:
	171	return I8K_VOL_MUTE;
	172	default:
	173	return 0;
	174	}
1da177e4 LT	175	}
	176
	177	/*
	178	* Read the power status.
	179	*/
	180	static int i8k_get_power_status(void)
	181	{
8378b924	182	struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
dec63ec3 DT	183	int rc;
dec63ec3 DT	184
8378b924	185	if ((rc = i8k_smm(&regs)) < 0)
dec63ec3	186	return rc;
dec63ec3	187
8378b924	188	return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
1da177e4 LT	189	}
	190
	191	/*
	192	* Read the fan status.
	193	*/
	194	static int i8k_get_fan_status(int fan)
	195	{
8378b924	196	struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
1da177e4	197
dec63ec3	198	regs.ebx = fan & 0xff;
8378b924	199	return i8k_smm(&regs) ? : regs.eax & 0xff;
1da177e4 LT	200	}
	201
	202	/*
	203	* Read the fan speed in RPM.
	204	*/
	205	static int i8k_get_fan_speed(int fan)
	206	{
8378b924	207	struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
1da177e4	208
dec63ec3	209	regs.ebx = fan & 0xff;
8378b924	210	return i8k_smm(&regs) ? : (regs.eax & 0xffff) * I8K_FAN_MULT;
1da177e4 LT	211	}
	212
	213	/*
	214	* Set the fan speed (off, low, high). Returns the new fan status.
	215	*/
	216	static int i8k_set_fan(int fan, int speed)
	217	{
8378b924	218	struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
1da177e4	219
dec63ec3	220	speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
dec63ec3	221	regs.ebx = (fan & 0xff) \| (speed << 8);
1da177e4	222
8378b924	223	return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
1da177e4 LT	224	}
	225
	226	/*
	227	* Read the cpu temperature.
	228	*/
	229	static int i8k_get_cpu_temp(void)
	230	{
8378b924	231	struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
dec63ec3 DT	232	int rc;
dec63ec3 DT	233	int temp;
1da177e4 LT	234
1da177e4 LT	235	#ifdef I8K_TEMPERATURE_BUG
8378b924	236	static int prev;
1da177e4 LT	237	#endif
1da177e4 LT	238
8378b924	239	if ((rc = i8k_smm(&regs)) < 0)
dec63ec3	240	return rc;
8378b924	241
dec63ec3	242	temp = regs.eax & 0xff;
1da177e4 LT	243
1da177e4 LT	244	#ifdef I8K_TEMPERATURE_BUG
dec63ec3 DT	245	/*
	246	* Sometimes the temperature sensor returns 0x99, which is out of range.
	247	* In this case we return (once) the previous cached value. For example:
	248	# 1003655137 00000058 00005a4b
	249	# 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
	250	# 1003655139 00000054 00005c52
	251	*/
	252	if (temp > I8K_MAX_TEMP) {
	253	temp = prev;
	254	prev = I8K_MAX_TEMP;
	255	} else {
	256	prev = temp;
	257	}
1da177e4 LT	258	#endif
1da177e4 LT	259
dec63ec3	260	return temp;
1da177e4 LT	261	}
	262
	263	static int i8k_get_dell_signature(void)
	264	{
8378b924	265	struct smm_regs regs = { .eax = I8K_SMM_GET_DELL_SIG, };
dec63ec3	266	int rc;
1da177e4	267
8378b924	268	if ((rc = i8k_smm(&regs)) < 0)
dec63ec3	269	return rc;
1da177e4	270
8378b924	271	return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
1da177e4 LT	272	}
	273
	274	static int i8k_ioctl(struct inode ip, struct file fp, unsigned int cmd,
	275	unsigned long arg)
	276	{
e70c9d5e	277	int val = 0;
dec63ec3 DT	278	int speed;
	279	unsigned char buff[16];
	280	int __user argp = (int __user )arg;
	281
	282	if (!argp)
	283	return -EINVAL;
	284
	285	switch (cmd) {
	286	case I8K_BIOS_VERSION:
	287	val = i8k_get_bios_version();
	288	break;
	289
	290	case I8K_MACHINE_ID:
	291	memset(buff, 0, 16);
e70c9d5e	292	strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), sizeof(buff));
dec63ec3 DT	293	break;
	294
	295	case I8K_FN_STATUS:
	296	val = i8k_get_fn_status();
	297	break;
	298
	299	case I8K_POWER_STATUS:
	300	val = i8k_get_power_status();
	301	break;
	302
	303	case I8K_GET_TEMP:
	304	val = i8k_get_cpu_temp();
	305	break;
	306
	307	case I8K_GET_SPEED:
8378b924	308	if (copy_from_user(&val, argp, sizeof(int)))
dec63ec3	309	return -EFAULT;
8378b924	310
dec63ec3 DT	311	val = i8k_get_fan_speed(val);
dec63ec3 DT	312	break;
1da177e4	313
dec63ec3	314	case I8K_GET_FAN:
8378b924	315	if (copy_from_user(&val, argp, sizeof(int)))
dec63ec3	316	return -EFAULT;
8378b924	317
dec63ec3 DT	318	val = i8k_get_fan_status(val);
dec63ec3 DT	319	break;
1da177e4	320
dec63ec3	321	case I8K_SET_FAN:
8378b924	322	if (restricted && !capable(CAP_SYS_ADMIN))
dec63ec3	323	return -EPERM;
8378b924 DT	324
8378b924 DT	325	if (copy_from_user(&val, argp, sizeof(int)))
dec63ec3	326	return -EFAULT;
8378b924 DT	327
8378b924 DT	328	if (copy_from_user(&speed, argp + 1, sizeof(int)))
dec63ec3	329	return -EFAULT;
8378b924	330
dec63ec3 DT	331	val = i8k_set_fan(val, speed);
dec63ec3 DT	332	break;
1da177e4	333
dec63ec3 DT	334	default:
dec63ec3 DT	335	return -EINVAL;
1da177e4	336	}
1da177e4	337
8378b924	338	if (val < 0)
dec63ec3	339	return val;
1da177e4	340
dec63ec3 DT	341	switch (cmd) {
dec63ec3 DT	342	case I8K_BIOS_VERSION:
8378b924	343	if (copy_to_user(argp, &val, 4))
dec63ec3	344	return -EFAULT;
8378b924	345
dec63ec3 DT	346	break;
dec63ec3 DT	347	case I8K_MACHINE_ID:
8378b924	348	if (copy_to_user(argp, buff, 16))
dec63ec3	349	return -EFAULT;
8378b924	350
dec63ec3 DT	351	break;
dec63ec3 DT	352	default:
8378b924	353	if (copy_to_user(argp, &val, sizeof(int)))
dec63ec3	354	return -EFAULT;
8378b924	355
dec63ec3	356	break;
1da177e4	357	}
1da177e4	358
dec63ec3	359	return 0;
1da177e4 LT	360	}
	361
	362	/*
	363	* Print the information for /proc/i8k.
	364	*/
352f8f8b	365	static int i8k_proc_show(struct seq_file seq, void offset)
1da177e4	366	{
352f8f8b	367	int fn_key, cpu_temp, ac_power;
dec63ec3 DT	368	int left_fan, right_fan, left_speed, right_speed;
	369
	370