blob: 6e40072fbf675e3c69b105cc8ea1d05491bba485 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Jean Delvare949a9d72011-05-25 20:43:33 +02008 * Hwmon integration:
9 * Copyright (C) 2011 Jean Delvare <khali@linux-fr.org>
10 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2, or (at your option) any
14 * later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 */
21
22#include <linux/module.h>
23#include <linux/types.h>
24#include <linux/init.h>
25#include <linux/proc_fs.h>
Dmitry Torokhov352f8f82005-06-25 14:54:26 -070026#include <linux/seq_file.h>
Dmitry Torokhove70c9d52005-06-25 14:54:25 -070027#include <linux/dmi.h>
Alexey Dobriyan7e80d0d2007-05-08 00:28:59 -070028#include <linux/capability.h>
Arnd Bergmann613655f2010-06-02 14:28:52 +020029#include <linux/mutex.h>
Jean Delvare949a9d72011-05-25 20:43:33 +020030#include <linux/hwmon.h>
31#include <linux/hwmon-sysfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <asm/uaccess.h>
33#include <asm/io.h>
34
35#include <linux/i8k.h>
36
Dmitry Torokhov352f8f82005-06-25 14:54:26 -070037#define I8K_VERSION "1.14 21/02/2005"
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#define I8K_SMM_FN_STATUS 0x0025
40#define I8K_SMM_POWER_STATUS 0x0069
41#define I8K_SMM_SET_FAN 0x01a3
42#define I8K_SMM_GET_FAN 0x00a3
43#define I8K_SMM_GET_SPEED 0x02a3
44#define I8K_SMM_GET_TEMP 0x10a3
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -070045#define I8K_SMM_GET_DELL_SIG1 0xfea3
46#define I8K_SMM_GET_DELL_SIG2 0xffa3
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#define I8K_SMM_BIOS_VERSION 0x00a6
48
49#define I8K_FAN_MULT 30
50#define I8K_MAX_TEMP 127
51
52#define I8K_FN_NONE 0x00
53#define I8K_FN_UP 0x01
54#define I8K_FN_DOWN 0x02
55#define I8K_FN_MUTE 0x04
56#define I8K_FN_MASK 0x07
57#define I8K_FN_SHIFT 8
58
59#define I8K_POWER_AC 0x05
60#define I8K_POWER_BATTERY 0x01
61
62#define I8K_TEMPERATURE_BUG 1
63
Arnd Bergmann613655f2010-06-02 14:28:52 +020064static DEFINE_MUTEX(i8k_mutex);
Dmitry Torokhove70c9d52005-06-25 14:54:25 -070065static char bios_version[4];
Jean Delvare949a9d72011-05-25 20:43:33 +020066static struct device *i8k_hwmon_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
68MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
69MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
70MODULE_LICENSE("GPL");
71
72static int force;
73module_param(force, bool, 0);
74MODULE_PARM_DESC(force, "Force loading without checking for supported models");
75
Dmitry Torokhove70c9d52005-06-25 14:54:25 -070076static int ignore_dmi;
77module_param(ignore_dmi, bool, 0);
78MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
79
Linus Torvalds1da177e2005-04-16 15:20:36 -070080static int restricted;
81module_param(restricted, bool, 0);
82MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
83
84static int power_status;
85module_param(power_status, bool, 0600);
86MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
87
Jochen Eisinger4ed99a22008-05-01 04:34:58 -070088static int fan_mult = I8K_FAN_MULT;
89module_param(fan_mult, int, 0);
90MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with");
91
Dmitry Torokhov352f8f82005-06-25 14:54:26 -070092static int i8k_open_fs(struct inode *inode, struct file *file);
Frederic Weisbeckerd79b6f42010-03-30 07:27:50 +020093static long i8k_ioctl(struct file *, unsigned int, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Arjan van de Ven62322d22006-07-03 00:24:21 -070095static const struct file_operations i8k_fops = {
Denis V. Lunev1b502212008-04-29 01:02:34 -070096 .owner = THIS_MODULE,
Dmitry Torokhov352f8f82005-06-25 14:54:26 -070097 .open = i8k_open_fs,
98 .read = seq_read,
99 .llseek = seq_lseek,
100 .release = single_release,
Frederic Weisbeckerd79b6f42010-03-30 07:27:50 +0200101 .unlocked_ioctl = i8k_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102};
103
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700104struct smm_regs {
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700105 unsigned int eax;
106 unsigned int ebx __attribute__ ((packed));
107 unsigned int ecx __attribute__ ((packed));
108 unsigned int edx __attribute__ ((packed));
109 unsigned int esi __attribute__ ((packed));
110 unsigned int edi __attribute__ ((packed));
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700111};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
Jeff Garzik18552562007-10-03 15:15:40 -0400113static inline const char *i8k_get_dmi_data(int field)
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700114{
Jeff Garzik18552562007-10-03 15:15:40 -0400115 const char *dmi_data = dmi_get_system_info(field);
Dmitry Torokhov4f005552005-11-12 00:55:15 -0500116
117 return dmi_data && *dmi_data ? dmi_data : "?";
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700118}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120/*
121 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
122 */
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700123static int i8k_smm(struct smm_regs *regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700125 int rc;
126 int eax = regs->eax;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Bradley Smithfe04f222008-02-07 00:16:27 -0800128#if defined(CONFIG_X86_64)
Jim Bos22d32432010-11-15 21:22:37 +0100129 asm volatile("pushq %%rax\n\t"
Bradley Smithfe04f222008-02-07 00:16:27 -0800130 "movl 0(%%rax),%%edx\n\t"
131 "pushq %%rdx\n\t"
132 "movl 4(%%rax),%%ebx\n\t"
133 "movl 8(%%rax),%%ecx\n\t"
134 "movl 12(%%rax),%%edx\n\t"
135 "movl 16(%%rax),%%esi\n\t"
136 "movl 20(%%rax),%%edi\n\t"
137 "popq %%rax\n\t"
138 "out %%al,$0xb2\n\t"
139 "out %%al,$0x84\n\t"
140 "xchgq %%rax,(%%rsp)\n\t"
141 "movl %%ebx,4(%%rax)\n\t"
142 "movl %%ecx,8(%%rax)\n\t"
143 "movl %%edx,12(%%rax)\n\t"
144 "movl %%esi,16(%%rax)\n\t"
145 "movl %%edi,20(%%rax)\n\t"
146 "popq %%rdx\n\t"
147 "movl %%edx,0(%%rax)\n\t"
Luca Tettamantibc1f4192011-05-25 20:43:31 +0200148 "pushfq\n\t"
149 "popq %%rax\n\t"
Bradley Smithfe04f222008-02-07 00:16:27 -0800150 "andl $1,%%eax\n"
Jim Bos22d32432010-11-15 21:22:37 +0100151 :"=a"(rc)
Bradley Smithfe04f222008-02-07 00:16:27 -0800152 : "a"(regs)
153 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
154#else
Jim Bos22d32432010-11-15 21:22:37 +0100155 asm volatile("pushl %%eax\n\t"
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700156 "movl 0(%%eax),%%edx\n\t"
157 "push %%edx\n\t"
158 "movl 4(%%eax),%%ebx\n\t"
159 "movl 8(%%eax),%%ecx\n\t"
160 "movl 12(%%eax),%%edx\n\t"
161 "movl 16(%%eax),%%esi\n\t"
162 "movl 20(%%eax),%%edi\n\t"
163 "popl %%eax\n\t"
164 "out %%al,$0xb2\n\t"
165 "out %%al,$0x84\n\t"
166 "xchgl %%eax,(%%esp)\n\t"
167 "movl %%ebx,4(%%eax)\n\t"
168 "movl %%ecx,8(%%eax)\n\t"
169 "movl %%edx,12(%%eax)\n\t"
170 "movl %%esi,16(%%eax)\n\t"
171 "movl %%edi,20(%%eax)\n\t"
172 "popl %%edx\n\t"
173 "movl %%edx,0(%%eax)\n\t"
174 "lahf\n\t"
175 "shrl $8,%%eax\n\t"
Jim Bos6b4e81d2010-11-13 12:13:53 +0100176 "andl $1,%%eax\n"
Jim Bos22d32432010-11-15 21:22:37 +0100177 :"=a"(rc)
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700178 : "a"(regs)
179 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
Bradley Smithfe04f222008-02-07 00:16:27 -0800180#endif
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700181 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700182 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700184 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185}
186
187/*
188 * Read the bios version. Return the version as an integer corresponding
189 * to the ascii value, for example "A17" is returned as 0x00413137.
190 */
191static int i8k_get_bios_version(void)
192{
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700193 struct smm_regs regs = { .eax = I8K_SMM_BIOS_VERSION, };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700195 return i8k_smm(&regs) ? : regs.eax;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196}
197
198/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 * Read the Fn key status.
200 */
201static int i8k_get_fn_status(void)
202{
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700203 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700204 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700206 if ((rc = i8k_smm(&regs)) < 0)
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700207 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700209 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
210 case I8K_FN_UP:
211 return I8K_VOL_UP;
212 case I8K_FN_DOWN:
213 return I8K_VOL_DOWN;
214 case I8K_FN_MUTE:
215 return I8K_VOL_MUTE;
216 default:
217 return 0;
218 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219}
220
221/*
222 * Read the power status.
223 */
224static int i8k_get_power_status(void)
225{
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700226 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700227 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700229 if ((rc = i8k_smm(&regs)) < 0)
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700230 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700232 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233}
234
235/*
236 * Read the fan status.
237 */
238static int i8k_get_fan_status(int fan)
239{
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700240 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700242 regs.ebx = fan & 0xff;
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700243 return i8k_smm(&regs) ? : regs.eax & 0xff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244}
245
246/*
247 * Read the fan speed in RPM.
248 */
249static int i8k_get_fan_speed(int fan)
250{
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700251 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700253 regs.ebx = fan & 0xff;
Jochen Eisinger4ed99a22008-05-01 04:34:58 -0700254 return i8k_smm(&regs) ? : (regs.eax & 0xffff) * fan_mult;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255}
256
257/*
258 * Set the fan speed (off, low, high). Returns the new fan status.
259 */
260static int i8k_set_fan(int fan, int speed)
261{
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700262 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700264 speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700265 regs.ebx = (fan & 0xff) | (speed << 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700267 return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268}
269
270/*
271 * Read the cpu temperature.
272 */
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -0700273static int i8k_get_temp(int sensor)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274{
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700275 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700276 int rc;
277 int temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
279#ifdef I8K_TEMPERATURE_BUG
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700280 static int prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281#endif
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -0700282 regs.ebx = sensor & 0xff;
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700283 if ((rc = i8k_smm(&regs)) < 0)
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700284 return rc;
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700285
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700286 temp = regs.eax & 0xff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
288#ifdef I8K_TEMPERATURE_BUG
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700289 /*
290 * Sometimes the temperature sensor returns 0x99, which is out of range.
291 * In this case we return (once) the previous cached value. For example:
292 # 1003655137 00000058 00005a4b
293 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
294 # 1003655139 00000054 00005c52
295 */
296 if (temp > I8K_MAX_TEMP) {
297 temp = prev;
298 prev = I8K_MAX_TEMP;
299 } else {
300 prev = temp;
301 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302#endif
303
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700304 return temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305}
306
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -0700307static int i8k_get_dell_signature(int req_fn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308{
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -0700309 struct smm_regs regs = { .eax = req_fn, };
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700310 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700312 if ((rc = i8k_smm(&regs)) < 0)
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700313 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700315 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316}
317
Frederic Weisbeckerd79b6f42010-03-30 07:27:50 +0200318static int
319i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320{
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700321 int val = 0;
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700322 int speed;
323 unsigned char buff[16];
324 int __user *argp = (int __user *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700326 if (!argp)
327 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700329 switch (cmd) {
330 case I8K_BIOS_VERSION:
331 val = i8k_get_bios_version();
332 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700334 case I8K_MACHINE_ID:
335 memset(buff, 0, 16);
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700336 strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), sizeof(buff));
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700337 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700339 case I8K_FN_STATUS:
340 val = i8k_get_fn_status();
341 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700343 case I8K_POWER_STATUS:
344 val = i8k_get_power_status();
345 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700347 case I8K_GET_TEMP:
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -0700348 val = i8k_get_temp(0);
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700349 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700351 case I8K_GET_SPEED:
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700352 if (copy_from_user(&val, argp, sizeof(int)))
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700353 return -EFAULT;
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700354
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700355 val = i8k_get_fan_speed(val);
356 break;
357
358 case I8K_GET_FAN:
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700359 if (copy_from_user(&val, argp, sizeof(int)))
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700360 return -EFAULT;
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700361
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700362 val = i8k_get_fan_status(val);
363 break;
364
365 case I8K_SET_FAN:
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700366 if (restricted && !capable(CAP_SYS_ADMIN))
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700367 return -EPERM;
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700368
369 if (copy_from_user(&val, argp, sizeof(int)))
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700370 return -EFAULT;
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700371
372 if (copy_from_user(&speed, argp + 1, sizeof(int)))
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700373 return -EFAULT;
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700374
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700375 val = i8k_set_fan(val, speed);
376 break;
377
378 default:
379 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700382 if (val < 0)
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700383 return val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700385 switch (cmd) {
386 case I8K_BIOS_VERSION:
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700387 if (copy_to_user(argp, &val, 4))
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700388 return -EFAULT;
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700389
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700390 break;
391 case I8K_MACHINE_ID:
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700392 if (copy_to_user(argp, buff, 16))
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700393 return -EFAULT;
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700394
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700395 break;
396 default:
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700397 if (copy_to_user(argp, &val, sizeof(int)))
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700398 return -EFAULT;
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700399
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700400 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700403 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404}
405
Frederic Weisbeckerd79b6f42010-03-30 07:27:50 +0200406static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
407{
408 long ret;
409
Arnd Bergmann613655f2010-06-02 14:28:52 +0200410 mutex_lock(&i8k_mutex);
Frederic Weisbeckerd79b6f42010-03-30 07:27:50 +0200411 ret = i8k_ioctl_unlocked(fp, cmd, arg);
Arnd Bergmann613655f2010-06-02 14:28:52 +0200412 mutex_unlock(&i8k_mutex);
Frederic Weisbeckerd79b6f42010-03-30 07:27:50 +0200413
414 return ret;
415}
416
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417/*
418 * Print the information for /proc/i8k.
419 */
Dmitry Torokhov352f8f82005-06-25 14:54:26 -0700420static int i8k_proc_show(struct seq_file *seq, void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421{
Dmitry Torokhov352f8f82005-06-25 14:54:26 -0700422 int fn_key, cpu_temp, ac_power;
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700423 int left_fan, right_fan, left_speed, right_speed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
Jan Engelhardt96de0e22007-10-19 23:21:04 +0200425 cpu_temp = i8k_get_temp(0); /* 11100 µs */
426 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */
427 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
428 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
429 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */
430 fn_key = i8k_get_fn_status(); /* 750 µs */
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700431 if (power_status)
Jan Engelhardt96de0e22007-10-19 23:21:04 +0200432 ac_power = i8k_get_power_status(); /* 14700 µs */
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700433 else
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700434 ac_power = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700436 /*
437 * Info:
438 *
439 * 1) Format version (this will change if format changes)
440 * 2) BIOS version
441 * 3) BIOS machine ID
442 * 4) Cpu temperature
443 * 5) Left fan status
444 * 6) Right fan status
445 * 7) Left fan speed
446 * 8) Right fan speed
447 * 9) AC power
448 * 10) Fn Key status
449 */
Dmitry Torokhov352f8f82005-06-25 14:54:26 -0700450 return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
451 I8K_PROC_FMT,
452 bios_version,
Dmitry Torokhov4f005552005-11-12 00:55:15 -0500453 i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
Dmitry Torokhov352f8f82005-06-25 14:54:26 -0700454 cpu_temp,
455 left_fan, right_fan, left_speed, right_speed,
456 ac_power, fn_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457}
458
Dmitry Torokhov352f8f82005-06-25 14:54:26 -0700459static int i8k_open_fs(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460{
Dmitry Torokhov352f8f82005-06-25 14:54:26 -0700461 return single_open(file, i8k_proc_show, NULL);
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700462}
463
Jean Delvare949a9d72011-05-25 20:43:33 +0200464
465/*
466 * Hwmon interface
467 */
468
469static ssize_t i8k_hwmon_show_temp(struct device *dev,
470 struct device_attribute *devattr,
471 char *buf)
472{
473 int cpu_temp;
474
475 cpu_temp = i8k_get_temp(0);
476 if (cpu_temp < 0)
477 return cpu_temp;
478 return sprintf(buf, "%d\n", cpu_temp * 1000);
479}
480
481static ssize_t i8k_hwmon_show_fan(struct device *dev,
482 struct device_attribute *devattr,
483 char *buf)
484{
485 int index = to_sensor_dev_attr(devattr)->index;
486 int fan_speed;
487
488 fan_speed = i8k_get_fan_speed(index);
489 if (fan_speed < 0)
490 return fan_speed;
491 return sprintf(buf, "%d\n", fan_speed);
492}
493
494static ssize_t i8k_hwmon_show_label(struct device *dev,
495 struct device_attribute *devattr,
496 char *buf)
497{
498 static const char *labels[4] = {
499 "i8k",
500 "CPU",
501 "Left Fan",
502 "Right Fan",
503 };
504 int index = to_sensor_dev_attr(devattr)->index;
505
506 return sprintf(buf, "%s\n", labels[index]);
507}
508
509static DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL);
510static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
511 I8K_FAN_LEFT);
512static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
513 I8K_FAN_RIGHT);
514static SENSOR_DEVICE_ATTR(name, S_IRUGO, i8k_hwmon_show_label, NULL, 0);
515static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_label, NULL, 1);
516static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_label, NULL, 2);
517static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_label, NULL, 3);
518
519static void i8k_hwmon_remove_files(struct device *dev)
520{
521 device_remove_file(dev, &dev_attr_temp1_input);
522 device_remove_file(dev, &sensor_dev_attr_fan1_input.dev_attr);
523 device_remove_file(dev, &sensor_dev_attr_fan2_input.dev_attr);
524 device_remove_file(dev, &sensor_dev_attr_temp1_label.dev_attr);
525 device_remove_file(dev, &sensor_dev_attr_fan1_label.dev_attr);
526 device_remove_file(dev, &sensor_dev_attr_fan2_label.dev_attr);
527 device_remove_file(dev, &sensor_dev_attr_name.dev_attr);
528}
529
530static int __init i8k_init_hwmon(void)
531{
532 int err;
533
534 i8k_hwmon_dev = hwmon_device_register(NULL);
535 if (IS_ERR(i8k_hwmon_dev)) {
536 err = PTR_ERR(i8k_hwmon_dev);
537 i8k_hwmon_dev = NULL;
538 printk(KERN_ERR "i8k: hwmon registration failed (%d)\n", err);
539 return err;
540 }
541
542 /* Required name attribute */
543 err = device_create_file(i8k_hwmon_dev,
544 &sensor_dev_attr_name.dev_attr);
545 if (err)
546 goto exit_unregister;
547
548 /* CPU temperature attributes, if temperature reading is OK */
549 err = i8k_get_temp(0);
550 if (err < 0) {
551 dev_dbg(i8k_hwmon_dev,
552 "Not creating temperature attributes (%d)\n", err);
553 } else {
554 err = device_create_file(i8k_hwmon_dev, &dev_attr_temp1_input);
555 if (err)
556 goto exit_remove_files;
557 err = device_create_file(i8k_hwmon_dev,
558 &sensor_dev_attr_temp1_label.dev_attr);
559 if (err)
560 goto exit_remove_files;
561 }
562
563 /* Left fan attributes, if left fan is present */
564 err = i8k_get_fan_status(I8K_FAN_LEFT);
565 if (err < 0) {
566 dev_dbg(i8k_hwmon_dev,
567 "Not creating %s fan attributes (%d)\n", "left", err);
568 } else {
569 err = device_create_file(i8k_hwmon_dev,
570 &sensor_dev_attr_fan1_input.dev_attr);
571 if (err)
572 goto exit_remove_files;
573 err = device_create_file(i8k_hwmon_dev,
574 &sensor_dev_attr_fan1_label.dev_attr);
575 if (err)
576 goto exit_remove_files;
577 }
578
579 /* Right fan attributes, if right fan is present */
580 err = i8k_get_fan_status(I8K_FAN_RIGHT);
581 if (err < 0) {
582 dev_dbg(i8k_hwmon_dev,
583 "Not creating %s fan attributes (%d)\n", "right", err);
584 } else {
585 err = device_create_file(i8k_hwmon_dev,
586 &sensor_dev_attr_fan2_input.dev_attr);
587 if (err)
588 goto exit_remove_files;
589 err = device_create_file(i8k_hwmon_dev,
590 &sensor_dev_attr_fan2_label.dev_attr);
591 if (err)
592 goto exit_remove_files;
593 }
594
595 return 0;
596
597 exit_remove_files:
598 i8k_hwmon_remove_files(i8k_hwmon_dev);
599 exit_unregister:
600 hwmon_device_unregister(i8k_hwmon_dev);
601 return err;
602}
603
604static void __exit i8k_exit_hwmon(void)
605{
606 i8k_hwmon_remove_files(i8k_hwmon_dev);
607 hwmon_device_unregister(i8k_hwmon_dev);
608}
609
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700610static struct dmi_system_id __initdata i8k_dmi_table[] = {
611 {
612 .ident = "Dell Inspiron",
613 .matches = {
614 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
615 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
616 },
617 },
618 {
619 .ident = "Dell Latitude",
620 .matches = {
621 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
622 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
623 },
624 },
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -0700625 {
626 .ident = "Dell Inspiron 2",
627 .matches = {
628 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
629 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
630 },
631 },
632 {
633 .ident = "Dell Latitude 2",
634 .matches = {
635 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
636 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
637 },
638 },
Nick Warnea9000d02008-02-06 01:37:47 -0800639 { /* UK Inspiron 6400 */
640 .ident = "Dell Inspiron 3",
641 .matches = {
642 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
643 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
644 },
645 },
Frank Sorenson48103c52008-02-07 00:16:31 -0800646 {
647 .ident = "Dell Inspiron 3",
648 .matches = {
649 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
650 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
651 },
652 },
Andy Spencer7ab21a82009-01-02 16:19:13 +0000653 {
654 .ident = "Dell Precision",
655 .matches = {
656 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
657 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
658 },
659 },
Federico Heinzbef2a502009-01-02 16:19:23 +0000660 {
661 .ident = "Dell Vostro",
662 .matches = {
663 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
664 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
665 },
666 },
667 { }
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700668};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669
670/*
671 * Probe for the presence of a supported laptop.
672 */
673static int __init i8k_probe(void)
674{
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700675 char buff[4];
676 int version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 /*
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700679 * Get DMI information
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 */
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700681 if (!dmi_check_system(i8k_dmi_table)) {
682 if (!ignore_dmi && !force)
683 return -ENODEV;
684
685 printk(KERN_INFO "i8k: not running on a supported Dell system.\n");
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700686 printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n",
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700687 i8k_get_dmi_data(DMI_SYS_VENDOR),
688 i8k_get_dmi_data(DMI_PRODUCT_NAME),
689 i8k_get_dmi_data(DMI_BIOS_VERSION));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 }
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700691
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700692 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), sizeof(bios_version));
693
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 /*
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700695 * Get SMM Dell signature
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 */
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -0700697 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
698 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700699 printk(KERN_ERR "i8k: unable to get SMM Dell signature\n");
700 if (!force)
701 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700704 /*
705 * Get SMM BIOS version.
706 */
707 version = i8k_get_bios_version();
708 if (version <= 0) {
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700709 printk(KERN_WARNING "i8k: unable to get SMM BIOS version\n");
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700710 } else {
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700711 buff[0] = (version >> 16) & 0xff;
712 buff[1] = (version >> 8) & 0xff;
713 buff[2] = (version) & 0xff;
714 buff[3] = '\0';
715 /*
716 * If DMI BIOS version is unknown use SMM BIOS version.
717 */
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700718 if (!dmi_get_system_info(DMI_BIOS_VERSION))
719 strlcpy(bios_version, buff, sizeof(bios_version));
720
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700721 /*
722 * Check if the two versions match.
723 */
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700724 if (strncmp(buff, bios_version, sizeof(bios_version)) != 0)
725 printk(KERN_WARNING "i8k: BIOS version mismatch: %s != %s\n",
726 buff, bios_version);
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700727 }
728
729 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730}
731
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700732static int __init i8k_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733{
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700734 struct proc_dir_entry *proc_i8k;
Jean Delvare949a9d72011-05-25 20:43:33 +0200735 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700737 /* Are we running on an supported laptop? */
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700738 if (i8k_probe())
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700739 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700741 /* Register the proc entry */
Denis V. Lunev1b502212008-04-29 01:02:34 -0700742 proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops);
Dmitry Torokhov352f8f82005-06-25 14:54:26 -0700743 if (!proc_i8k)
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700744 return -ENOENT;
Dmitry Torokhov352f8f82005-06-25 14:54:26 -0700745
Jean Delvare949a9d72011-05-25 20:43:33 +0200746 err = i8k_init_hwmon();
747 if (err)
748 goto exit_remove_proc;
749
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700750 printk(KERN_INFO
751 "Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n",
752 I8K_VERSION);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700754 return 0;
Jean Delvare949a9d72011-05-25 20:43:33 +0200755
756 exit_remove_proc:
757 remove_proc_entry("i8k", NULL);
758 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759}
760
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700761static void __exit i8k_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762{
Jean Delvare949a9d72011-05-25 20:43:33 +0200763 i8k_exit_hwmon();
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700764 remove_proc_entry("i8k", NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766
Dmitry Torokhov8378b9242005-06-25 14:54:27 -0700767module_init(i8k_init);
768module_exit(i8k_exit);