blob: f3c3aaf4560e86d07161fb2b8255882c9bf74599 [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 *
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>
Dmitry Torokhov352f8f82005-06-25 14:54:26 -070023#include <linux/seq_file.h>
Dmitry Torokhove70c9d52005-06-25 14:54:25 -070024#include <linux/dmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <asm/uaccess.h>
26#include <asm/io.h>
27
28#include <linux/i8k.h>
29
Dmitry Torokhov352f8f82005-06-25 14:54:26 -070030#define I8K_VERSION "1.14 21/02/2005"
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
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
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -070038#define I8K_SMM_GET_DELL_SIG1 0xfea3
39#define I8K_SMM_GET_DELL_SIG2 0xffa3
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#define I8K_SMM_BIOS_VERSION 0x00a6
41
42#define I8K_FAN_MULT 30
43#define I8K_MAX_TEMP 127
44
45#define I8K_FN_NONE 0x00
46#define I8K_FN_UP 0x01
47#define I8K_FN_DOWN 0x02
48#define I8K_FN_MUTE 0x04
49#define I8K_FN_MASK 0x07
50#define I8K_FN_SHIFT 8
51
52#define I8K_POWER_AC 0x05
53#define I8K_POWER_BATTERY 0x01
54
55#define I8K_TEMPERATURE_BUG 1
56
Dmitry Torokhove70c9d52005-06-25 14:54:25 -070057static char bios_version[4];
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
60MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
61MODULE_LICENSE("GPL");
62
63static int force;
64module_param(force, bool, 0);
65MODULE_PARM_DESC(force, "Force loading without checking for supported models");
66
Dmitry Torokhove70c9d52005-06-25 14:54:25 -070067static int ignore_dmi;
68module_param(ignore_dmi, bool, 0);
69MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
70
Linus Torvalds1da177e2005-04-16 15:20:36 -070071static int restricted;
72module_param(restricted, bool, 0);
73MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
74
75static int power_status;
76module_param(power_status, bool, 0600);
77MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
78
Dmitry Torokhov352f8f82005-06-25 14:54:26 -070079static int i8k_open_fs(struct inode *inode, struct file *file);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080static int i8k_ioctl(struct inode *, struct file *, unsigned int,
81 unsigned long);
82
83static struct file_operations i8k_fops = {
Dmitry Torokhov352f8f82005-06-25 14:54:26 -070084 .open = i8k_open_fs,
85 .read = seq_read,
86 .llseek = seq_lseek,
87 .release = single_release,
88 .ioctl = i8k_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -070089};
90
Dmitry Torokhov8378b922005-06-25 14:54:27 -070091struct smm_regs {
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -070092 unsigned int eax;
93 unsigned int ebx __attribute__ ((packed));
94 unsigned int ecx __attribute__ ((packed));
95 unsigned int edx __attribute__ ((packed));
96 unsigned int esi __attribute__ ((packed));
97 unsigned int edi __attribute__ ((packed));
Dmitry Torokhov8378b922005-06-25 14:54:27 -070098};
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700100static inline char *i8k_get_dmi_data(int field)
101{
Dmitry Torokhov4f005552005-11-12 00:55:15 -0500102 char *dmi_data = dmi_get_system_info(field);
103
104 return dmi_data && *dmi_data ? dmi_data : "?";
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700105}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
107/*
108 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
109 */
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700110static int i8k_smm(struct smm_regs *regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111{
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700112 int rc;
113 int eax = regs->eax;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700115 asm("pushl %%eax\n\t"
116 "movl 0(%%eax),%%edx\n\t"
117 "push %%edx\n\t"
118 "movl 4(%%eax),%%ebx\n\t"
119 "movl 8(%%eax),%%ecx\n\t"
120 "movl 12(%%eax),%%edx\n\t"
121 "movl 16(%%eax),%%esi\n\t"
122 "movl 20(%%eax),%%edi\n\t"
123 "popl %%eax\n\t"
124 "out %%al,$0xb2\n\t"
125 "out %%al,$0x84\n\t"
126 "xchgl %%eax,(%%esp)\n\t"
127 "movl %%ebx,4(%%eax)\n\t"
128 "movl %%ecx,8(%%eax)\n\t"
129 "movl %%edx,12(%%eax)\n\t"
130 "movl %%esi,16(%%eax)\n\t"
131 "movl %%edi,20(%%eax)\n\t"
132 "popl %%edx\n\t"
133 "movl %%edx,0(%%eax)\n\t"
134 "lahf\n\t"
135 "shrl $8,%%eax\n\t"
136 "andl $1,%%eax\n":"=a"(rc)
137 : "a"(regs)
138 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700140 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700141 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700143 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144}
145
146/*
147 * Read the bios version. Return the version as an integer corresponding
148 * to the ascii value, for example "A17" is returned as 0x00413137.
149 */
150static int i8k_get_bios_version(void)
151{
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700152 struct smm_regs regs = { .eax = I8K_SMM_BIOS_VERSION, };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700154 return i8k_smm(&regs) ? : regs.eax;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155}
156
157/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 * Read the Fn key status.
159 */
160static int i8k_get_fn_status(void)
161{
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700162 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700163 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700165 if ((rc = i8k_smm(&regs)) < 0)
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700166 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700168 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
169 case I8K_FN_UP:
170 return I8K_VOL_UP;
171 case I8K_FN_DOWN:
172 return I8K_VOL_DOWN;
173 case I8K_FN_MUTE:
174 return I8K_VOL_MUTE;
175 default:
176 return 0;
177 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178}
179
180/*
181 * Read the power status.
182 */
183static int i8k_get_power_status(void)
184{
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700185 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700186 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700188 if ((rc = i8k_smm(&regs)) < 0)
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700189 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700191 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192}
193
194/*
195 * Read the fan status.
196 */
197static int i8k_get_fan_status(int fan)
198{
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700199 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700201 regs.ebx = fan & 0xff;
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700202 return i8k_smm(&regs) ? : regs.eax & 0xff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203}
204
205/*
206 * Read the fan speed in RPM.
207 */
208static int i8k_get_fan_speed(int fan)
209{
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700210 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700212 regs.ebx = fan & 0xff;
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700213 return i8k_smm(&regs) ? : (regs.eax & 0xffff) * I8K_FAN_MULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214}
215
216/*
217 * Set the fan speed (off, low, high). Returns the new fan status.
218 */
219static int i8k_set_fan(int fan, int speed)
220{
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700221 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700223 speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700224 regs.ebx = (fan & 0xff) | (speed << 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700226 return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227}
228
229/*
230 * Read the cpu temperature.
231 */
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -0700232static int i8k_get_temp(int sensor)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233{
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700234 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700235 int rc;
236 int temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
238#ifdef I8K_TEMPERATURE_BUG
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700239 static int prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240#endif
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -0700241 regs.ebx = sensor & 0xff;
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700242 if ((rc = i8k_smm(&regs)) < 0)
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700243 return rc;
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700244
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700245 temp = regs.eax & 0xff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
247#ifdef I8K_TEMPERATURE_BUG
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700248 /*
249 * Sometimes the temperature sensor returns 0x99, which is out of range.
250 * In this case we return (once) the previous cached value. For example:
251 # 1003655137 00000058 00005a4b
252 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
253 # 1003655139 00000054 00005c52
254 */
255 if (temp > I8K_MAX_TEMP) {
256 temp = prev;
257 prev = I8K_MAX_TEMP;
258 } else {
259 prev = temp;
260 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261#endif
262
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700263 return temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264}
265
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -0700266static int i8k_get_dell_signature(int req_fn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267{
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -0700268 struct smm_regs regs = { .eax = req_fn, };
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700269 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700271 if ((rc = i8k_smm(&regs)) < 0)
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700272 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700274 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275}
276
277static int i8k_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
278 unsigned long arg)
279{
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700280 int val = 0;
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700281 int speed;
282 unsigned char buff[16];
283 int __user *argp = (int __user *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700285 if (!argp)
286 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700288 switch (cmd) {
289 case I8K_BIOS_VERSION:
290 val = i8k_get_bios_version();
291 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700293 case I8K_MACHINE_ID:
294 memset(buff, 0, 16);
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700295 strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), sizeof(buff));
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700296 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700298 case I8K_FN_STATUS:
299 val = i8k_get_fn_status();
300 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700302 case I8K_POWER_STATUS:
303 val = i8k_get_power_status();
304 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700306 case I8K_GET_TEMP:
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -0700307 val = i8k_get_temp(0);
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700308 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700310 case I8K_GET_SPEED:
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700311 if (copy_from_user(&val, argp, sizeof(int)))
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700312 return -EFAULT;
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700313
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700314 val = i8k_get_fan_speed(val);
315 break;
316
317 case I8K_GET_FAN:
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700318 if (copy_from_user(&val, argp, sizeof(int)))
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700319 return -EFAULT;
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700320
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700321 val = i8k_get_fan_status(val);
322 break;
323
324 case I8K_SET_FAN:
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700325 if (restricted && !capable(CAP_SYS_ADMIN))
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700326 return -EPERM;
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700327
328 if (copy_from_user(&val, argp, sizeof(int)))
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700329 return -EFAULT;
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700330
331 if (copy_from_user(&speed, argp + 1, sizeof(int)))
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700332 return -EFAULT;
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700333
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700334 val = i8k_set_fan(val, speed);
335 break;
336
337 default:
338 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700341 if (val < 0)
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700342 return val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700344 switch (cmd) {
345 case I8K_BIOS_VERSION:
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700346 if (copy_to_user(argp, &val, 4))
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700347 return -EFAULT;
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700348
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700349 break;
350 case I8K_MACHINE_ID:
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700351 if (copy_to_user(argp, buff, 16))
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700352 return -EFAULT;
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700353
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700354 break;
355 default:
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700356 if (copy_to_user(argp, &val, sizeof(int)))
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700357 return -EFAULT;
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700358
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700359 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700362 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363}
364
365/*
366 * Print the information for /proc/i8k.
367 */
Dmitry Torokhov352f8f82005-06-25 14:54:26 -0700368static int i8k_proc_show(struct seq_file *seq, void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369{
Dmitry Torokhov352f8f82005-06-25 14:54:26 -0700370 int fn_key, cpu_temp, ac_power;
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700371 int left_fan, right_fan, left_speed, right_speed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -0700373 cpu_temp = i8k_get_temp(0); /* 11100 µs */
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700374 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */
375 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
376 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
377 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */
378 fn_key = i8k_get_fn_status(); /* 750 µs */
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700379 if (power_status)
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700380 ac_power = i8k_get_power_status(); /* 14700 µs */
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700381 else
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700382 ac_power = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700384 /*
385 * Info:
386 *
387 * 1) Format version (this will change if format changes)
388 * 2) BIOS version
389 * 3) BIOS machine ID
390 * 4) Cpu temperature
391 * 5) Left fan status
392 * 6) Right fan status
393 * 7) Left fan speed
394 * 8) Right fan speed
395 * 9) AC power
396 * 10) Fn Key status
397 */
Dmitry Torokhov352f8f82005-06-25 14:54:26 -0700398 return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
399 I8K_PROC_FMT,
400 bios_version,
Dmitry Torokhov4f005552005-11-12 00:55:15 -0500401 i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
Dmitry Torokhov352f8f82005-06-25 14:54:26 -0700402 cpu_temp,
403 left_fan, right_fan, left_speed, right_speed,
404 ac_power, fn_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405}
406
Dmitry Torokhov352f8f82005-06-25 14:54:26 -0700407static int i8k_open_fs(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408{
Dmitry Torokhov352f8f82005-06-25 14:54:26 -0700409 return single_open(file, i8k_proc_show, NULL);
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700410}
411
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700412static struct dmi_system_id __initdata i8k_dmi_table[] = {
413 {
414 .ident = "Dell Inspiron",
415 .matches = {
416 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
417 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
418 },
419 },
420 {
421 .ident = "Dell Latitude",
422 .matches = {
423 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
424 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
425 },
426 },
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -0700427 {
428 .ident = "Dell Inspiron 2",
429 .matches = {
430 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
431 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
432 },
433 },
434 {
435 .ident = "Dell Latitude 2",
436 .matches = {
437 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
438 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
439 },
440 },
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700441 { }
442};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
444/*
445 * Probe for the presence of a supported laptop.
446 */
447static int __init i8k_probe(void)
448{
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700449 char buff[4];
450 int version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 /*
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700453 * Get DMI information
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 */
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700455 if (!dmi_check_system(i8k_dmi_table)) {
456 if (!ignore_dmi && !force)
457 return -ENODEV;
458
459 printk(KERN_INFO "i8k: not running on a supported Dell system.\n");
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700460 printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n",
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700461 i8k_get_dmi_data(DMI_SYS_VENDOR),
462 i8k_get_dmi_data(DMI_PRODUCT_NAME),
463 i8k_get_dmi_data(DMI_BIOS_VERSION));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 }
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700465
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700466 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), sizeof(bios_version));
467
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 /*
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700469 * Get SMM Dell signature
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 */
Dmitry Torokhov7e0fa312005-06-25 14:54:28 -0700471 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
472 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700473 printk(KERN_ERR "i8k: unable to get SMM Dell signature\n");
474 if (!force)
475 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700478 /*
479 * Get SMM BIOS version.
480 */
481 version = i8k_get_bios_version();
482 if (version <= 0) {
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700483 printk(KERN_WARNING "i8k: unable to get SMM BIOS version\n");
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700484 } else {
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700485 buff[0] = (version >> 16) & 0xff;
486 buff[1] = (version >> 8) & 0xff;
487 buff[2] = (version) & 0xff;
488 buff[3] = '\0';
489 /*
490 * If DMI BIOS version is unknown use SMM BIOS version.
491 */
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700492 if (!dmi_get_system_info(DMI_BIOS_VERSION))
493 strlcpy(bios_version, buff, sizeof(bios_version));
494
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700495 /*
496 * Check if the two versions match.
497 */
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700498 if (strncmp(buff, bios_version, sizeof(bios_version)) != 0)
499 printk(KERN_WARNING "i8k: BIOS version mismatch: %s != %s\n",
500 buff, bios_version);
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700501 }
502
503 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504}
505
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700506static int __init i8k_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507{
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700508 struct proc_dir_entry *proc_i8k;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700510 /* Are we running on an supported laptop? */
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700511 if (i8k_probe())
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700512 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700514 /* Register the proc entry */
Dmitry Torokhov352f8f82005-06-25 14:54:26 -0700515 proc_i8k = create_proc_entry("i8k", 0, NULL);
516 if (!proc_i8k)
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700517 return -ENOENT;
Dmitry Torokhov352f8f82005-06-25 14:54:26 -0700518
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700519 proc_i8k->proc_fops = &i8k_fops;
520 proc_i8k->owner = THIS_MODULE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700522 printk(KERN_INFO
523 "Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n",
524 I8K_VERSION);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700526 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527}
528
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700529static void __exit i8k_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530{
Dmitry Torokhovdec63ec2005-06-25 14:54:23 -0700531 remove_proc_entry("i8k", NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
Dmitry Torokhov8378b922005-06-25 14:54:27 -0700534module_init(i8k_init);
535module_exit(i8k_exit);