Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * i8k.c -- Linux driver for accessing the SMM BIOS on Dell laptops. | |
3 | * See http://www.debian.org/~dz/i8k/ for more information | |
4 | * and for latest version of this driver. | |
5 | * | |
6 | * Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2, or (at your option) any | |
11 | * later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/proc_fs.h> | |
352f8f8b | 23 | #include <linux/seq_file.h> |
e70c9d5e | 24 | #include <linux/dmi.h> |
7e80d0d0 | 25 | #include <linux/capability.h> |
1da177e4 LT |
26 | #include <asm/uaccess.h> |
27 | #include <asm/io.h> | |
28 | ||
29 | #include <linux/i8k.h> | |
30 | ||
352f8f8b | 31 | #define I8K_VERSION "1.14 21/02/2005" |
1da177e4 LT |
32 | |
33 | #define I8K_SMM_FN_STATUS 0x0025 | |
34 | #define I8K_SMM_POWER_STATUS 0x0069 | |
35 | #define I8K_SMM_SET_FAN 0x01a3 | |
36 | #define I8K_SMM_GET_FAN 0x00a3 | |
37 | #define I8K_SMM_GET_SPEED 0x02a3 | |
38 | #define I8K_SMM_GET_TEMP 0x10a3 | |
7e0fa31d DT |
39 | #define I8K_SMM_GET_DELL_SIG1 0xfea3 |
40 | #define I8K_SMM_GET_DELL_SIG2 0xffa3 | |
1da177e4 LT |
41 | #define I8K_SMM_BIOS_VERSION 0x00a6 |
42 | ||
43 | #define I8K_FAN_MULT 30 | |
44 | #define I8K_MAX_TEMP 127 | |
45 | ||
46 | #define I8K_FN_NONE 0x00 | |
47 | #define I8K_FN_UP 0x01 | |
48 | #define I8K_FN_DOWN 0x02 | |
49 | #define I8K_FN_MUTE 0x04 | |
50 | #define I8K_FN_MASK 0x07 | |
51 | #define I8K_FN_SHIFT 8 | |
52 | ||
53 | #define I8K_POWER_AC 0x05 | |
54 | #define I8K_POWER_BATTERY 0x01 | |
55 | ||
56 | #define I8K_TEMPERATURE_BUG 1 | |
57 | ||
e70c9d5e | 58 | static char bios_version[4]; |
1da177e4 LT |
59 | |
60 | MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)"); | |
61 | MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops"); | |
62 | MODULE_LICENSE("GPL"); | |
63 | ||
64 | static int force; | |
65 | module_param(force, bool, 0); | |
66 | MODULE_PARM_DESC(force, "Force loading without checking for supported models"); | |
67 | ||
e70c9d5e DT |
68 | static int ignore_dmi; |
69 | module_param(ignore_dmi, bool, 0); | |
70 | MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match"); | |
71 | ||
1da177e4 LT |
72 | static int restricted; |
73 | module_param(restricted, bool, 0); | |
74 | MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set"); | |
75 | ||
76 | static int power_status; | |
77 | module_param(power_status, bool, 0600); | |
78 | MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k"); | |
79 | ||
352f8f8b | 80 | static int i8k_open_fs(struct inode *inode, struct file *file); |
1da177e4 LT |
81 | static int i8k_ioctl(struct inode *, struct file *, unsigned int, |
82 | unsigned long); | |
83 | ||
62322d25 | 84 | static const struct file_operations i8k_fops = { |
352f8f8b DT |
85 | .open = i8k_open_fs, |
86 | .read = seq_read, | |
87 | .llseek = seq_lseek, | |
88 | .release = single_release, | |
89 | .ioctl = i8k_ioctl, | |
1da177e4 LT |
90 | }; |
91 | ||
8378b924 | 92 | struct smm_regs { |
dec63ec3 DT |
93 | unsigned int eax; |
94 | unsigned int ebx __attribute__ ((packed)); | |
95 | unsigned int ecx __attribute__ ((packed)); | |
96 | unsigned int edx __attribute__ ((packed)); | |
97 | unsigned int esi __attribute__ ((packed)); | |
98 | unsigned int edi __attribute__ ((packed)); | |
8378b924 | 99 | }; |
1da177e4 | 100 | |
1855256c | 101 | static inline const char *i8k_get_dmi_data(int field) |
e70c9d5e | 102 | { |
1855256c | 103 | const char *dmi_data = dmi_get_system_info(field); |
4f005551 DT |
104 | |
105 | return dmi_data && *dmi_data ? dmi_data : "?"; | |
e70c9d5e | 106 | } |
1da177e4 LT |
107 | |
108 | /* | |
109 | * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard. | |
110 | */ | |
8378b924 | 111 | static int i8k_smm(struct smm_regs *regs) |
1da177e4 | 112 | { |
dec63ec3 DT |
113 | int rc; |
114 | int eax = regs->eax; | |
115 | ||
116 | asm("pushl %%eax\n\t" | |
117 | "movl 0(%%eax),%%edx\n\t" | |
118 | "push %%edx\n\t" | |
119 | "movl 4(%%eax),%%ebx\n\t" | |
120 | "movl 8(%%eax),%%ecx\n\t" | |
121 | "movl 12(%%eax),%%edx\n\t" | |
122 | "movl 16(%%eax),%%esi\n\t" | |
123 | "movl 20(%%eax),%%edi\n\t" | |
124 | "popl %%eax\n\t" | |
125 | "out %%al,$0xb2\n\t" | |
126 | "out %%al,$0x84\n\t" | |
127 | "xchgl %%eax,(%%esp)\n\t" | |
128 | "movl %%ebx,4(%%eax)\n\t" | |
129 | "movl %%ecx,8(%%eax)\n\t" | |
130 | "movl %%edx,12(%%eax)\n\t" | |
131 | "movl %%esi,16(%%eax)\n\t" | |
132 | "movl %%edi,20(%%eax)\n\t" | |
133 | "popl %%edx\n\t" | |
134 | "movl %%edx,0(%%eax)\n\t" | |
135 | "lahf\n\t" | |
136 | "shrl $8,%%eax\n\t" | |
137 | "andl $1,%%eax\n":"=a"(rc) | |
138 | : "a"(regs) | |
139 | : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); | |
140 | ||
8378b924 | 141 | if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax) |
dec63ec3 | 142 | return -EINVAL; |
dec63ec3 DT |
143 | |
144 | return 0; | |
1da177e4 LT |
145 | } |
146 | ||
147 | /* | |
148 | * Read the bios version. Return the version as an integer corresponding | |
149 | * to the ascii value, for example "A17" is returned as 0x00413137. | |
150 | */ | |
151 | static int i8k_get_bios_version(void) | |
152 | { | |
8378b924 | 153 | struct smm_regs regs = { .eax = I8K_SMM_BIOS_VERSION, }; |
1da177e4 | 154 | |
8378b924 | 155 | return i8k_smm(®s) ? : regs.eax; |
1da177e4 LT |
156 | } |
157 | ||
1da177e4 LT |
158 | /* |
159 | * Read the Fn key status. | |
160 | */ | |
161 | static int i8k_get_fn_status(void) | |
162 | { | |
8378b924 | 163 | struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, }; |
dec63ec3 DT |
164 | int rc; |
165 | ||
8378b924 | 166 | if ((rc = i8k_smm(®s)) < 0) |
dec63ec3 | 167 | return rc; |
dec63ec3 DT |
168 | |
169 | switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) { | |
170 | case I8K_FN_UP: | |
171 | return I8K_VOL_UP; | |
172 | case I8K_FN_DOWN: | |
173 | return I8K_VOL_DOWN; | |
174 | case I8K_FN_MUTE: | |
175 | return I8K_VOL_MUTE; | |
176 | default: | |
177 | return 0; | |
178 | } | |
1da177e4 LT |
179 | } |
180 | ||
181 | /* | |
182 | * Read the power status. | |
183 | */ | |
184 | static int i8k_get_power_status(void) | |
185 | { | |
8378b924 | 186 | struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, }; |
dec63ec3 DT |
187 | int rc; |
188 | ||
8378b924 | 189 | if ((rc = i8k_smm(®s)) < 0) |
dec63ec3 | 190 | return rc; |
dec63ec3 | 191 | |
8378b924 | 192 | return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY; |
1da177e4 LT |
193 | } |
194 | ||
195 | /* | |
196 | * Read the fan status. | |
197 | */ | |
198 | static int i8k_get_fan_status(int fan) | |
199 | { | |
8378b924 | 200 | struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, }; |
1da177e4 | 201 | |
dec63ec3 | 202 | regs.ebx = fan & 0xff; |
8378b924 | 203 | return i8k_smm(®s) ? : regs.eax & 0xff; |
1da177e4 LT |
204 | } |
205 | ||
206 | /* | |
207 | * Read the fan speed in RPM. | |
208 | */ | |
209 | static int i8k_get_fan_speed(int fan) | |
210 | { | |
8378b924 | 211 | struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, }; |
1da177e4 | 212 | |
dec63ec3 | 213 | regs.ebx = fan & 0xff; |
8378b924 | 214 | return i8k_smm(®s) ? : (regs.eax & 0xffff) * I8K_FAN_MULT; |
1da177e4 LT |
215 | } |
216 | ||
217 | /* | |
218 | * Set the fan speed (off, low, high). Returns the new fan status. | |
219 | */ | |
220 | static int i8k_set_fan(int fan, int speed) | |
221 | { | |
8378b924 | 222 | struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, }; |
1da177e4 | 223 | |
dec63ec3 | 224 | speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed); |
dec63ec3 | 225 | regs.ebx = (fan & 0xff) | (speed << 8); |
1da177e4 | 226 | |
8378b924 | 227 | return i8k_smm(®s) ? : i8k_get_fan_status(fan); |
1da177e4 LT |
228 | } |
229 | ||
230 | /* | |
231 | * Read the cpu temperature. | |
232 | */ | |
7e0fa31d | 233 | static int i8k_get_temp(int sensor) |
1da177e4 | 234 | { |
8378b924 | 235 | struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, }; |
dec63ec3 DT |
236 | int rc; |
237 | int temp; | |
1da177e4 LT |
238 | |
239 | #ifdef I8K_TEMPERATURE_BUG | |
8378b924 | 240 | static int prev; |
1da177e4 | 241 | #endif |
7e0fa31d | 242 | regs.ebx = sensor & 0xff; |
8378b924 | 243 | if ((rc = i8k_smm(®s)) < 0) |
dec63ec3 | 244 | return rc; |
8378b924 | 245 | |
dec63ec3 | 246 | temp = regs.eax & 0xff; |
1da177e4 LT |
247 | |
248 | #ifdef I8K_TEMPERATURE_BUG | |
dec63ec3 DT |
249 | /* |
250 | * Sometimes the temperature sensor returns 0x99, which is out of range. | |
251 | * In this case we return (once) the previous cached value. For example: | |
252 | # 1003655137 00000058 00005a4b | |
253 | # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees | |
254 | # 1003655139 00000054 00005c52 | |
255 | */ | |
256 | if (temp > I8K_MAX_TEMP) { | |
257 | temp = prev; | |
258 | prev = I8K_MAX_TEMP; | |
259 | } else { | |
260 | prev = temp; | |
261 | } | |
1da177e4 LT |
262 | #endif |
263 | ||
dec63ec3 | 264 | return temp; |
1da177e4 LT |
265 | } |
266 | ||
7e0fa31d | 267 | static int i8k_get_dell_signature(int req_fn) |
1da177e4 | 268 | { |
7e0fa31d | 269 | struct smm_regs regs = { .eax = req_fn, }; |
dec63ec3 | 270 | int rc; |
1da177e4 | 271 | |
8378b924 | 272 | if ((rc = i8k_smm(®s)) < 0) |
dec63ec3 | 273 | return rc; |
1da177e4 | 274 | |
8378b924 | 275 | return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1; |
1da177e4 LT |
276 | } |
277 | ||
278 | static int i8k_ioctl(struct inode *ip, struct file *fp, unsigned int cmd, | |
279 | unsigned long arg) | |
280 | { | |
e70c9d5e | 281 | int val = 0; |
dec63ec3 DT |
282 | int speed; |
283 | unsigned char buff[16]; | |
284 | int __user *argp = (int __user *)arg; | |
285 | ||
286 | if (!argp) | |
287 | return -EINVAL; | |
288 | ||
289 | switch (cmd) { | |
290 | case I8K_BIOS_VERSION: | |
291 | val = i8k_get_bios_version(); | |
292 | break; | |
293 | ||
294 | case I8K_MACHINE_ID: | |
295 | memset(buff, 0, 16); | |
e70c9d5e | 296 | strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), sizeof(buff)); |
dec63ec3 DT |
297 | break; |
298 | ||
299 | case I8K_FN_STATUS: | |
300 | val = i8k_get_fn_status(); | |
301 | break; | |
302 | ||
303 | case I8K_POWER_STATUS: | |
304 | val = i8k_get_power_status(); | |
305 | break; | |
306 | ||
307 | case I8K_GET_TEMP: | |
7e0fa31d | 308 | val = i8k_get_temp(0); |
dec63ec3 DT |
309 | break; |
310 | ||
311 | case I8K_GET_SPEED: | |
8378b924 | 312 | if (copy_from_user(&val, argp, sizeof(int))) |
dec63ec3 | 313 | return -EFAULT; |
8378b924 | 314 | |
dec63ec3 DT |
315 | val = i8k_get_fan_speed(val); |
316 | break; | |
1da177e4 | 317 | |
dec63ec3 | 318 | case I8K_GET_FAN: |
8378b924 | 319 | if (copy_from_user(&val, argp, sizeof(int))) |
dec63ec3 | 320 | return -EFAULT; |
8378b924 | 321 | |
dec63ec3 DT |
322 | val = i8k_get_fan_status(val); |
323 | break; | |
1da177e4 | 324 | |
dec63ec3 | 325 | case I8K_SET_FAN: |
8378b924 | 326 | if (restricted && !capable(CAP_SYS_ADMIN)) |
dec63ec3 | 327 | return -EPERM; |
8378b924 DT |
328 | |
329 | if (copy_from_user(&val, argp, sizeof(int))) | |
dec63ec3 | 330 | return -EFAULT; |
8378b924 DT |
331 | |
332 | if (copy_from_user(&speed, argp + 1, sizeof(int))) | |
dec63ec3 | 333 | return -EFAULT; |
8378b924 | 334 | |
dec63ec3 DT |
335 | val = i8k_set_fan(val, speed); |
336 | break; | |
1da177e4 | 337 | |
dec63ec3 DT |
338 | default: |
339 | return -EINVAL; | |
1da177e4 | 340 | } |
1da177e4 | 341 | |
8378b924 | 342 | if (val < 0) |
dec63ec3 | 343 | return val; |
1da177e4 | 344 | |
dec63ec3 DT |
345 | switch (cmd) { |
346 | case I8K_BIOS_VERSION: | |
8378b924 | 347 | if (copy_to_user(argp, &val, 4)) |
dec63ec3 | 348 | return -EFAULT; |
8378b924 | 349 | |
dec63ec3 DT |
350 | break; |
351 | case I8K_MACHINE_ID: | |
8378b924 | 352 | if (copy_to_user(argp, buff, 16)) |
dec63ec3 | 353 | return -EFAULT; |
8378b924 | 354 | |
dec63ec3 DT |
355 | break; |
356 | default: | |
8378b924 | 357 | if (copy_to_user(argp, &val, sizeof(int))) |
dec63ec3 | 358 | return -EFAULT; |
8378b924 | 359 | |
dec63ec3 | 360 | break; |
1da177e4 | 361 | } |
1da177e4 | 362 | |
dec63ec3 | 363 | return 0; |
1da177e4 LT |
364 | } |
365 | ||
366 | /* | |
367 | * Print the information for /proc/i8k. | |
368 | */ | |
352f8f8b | 369 | static int i8k_proc_show(struct seq_file *seq, void *offset) |
1da177e4 | 370 | { |
352f8f8b | 371 | int fn_key, cpu_temp, ac_power; |
dec63ec3 DT |
372 | int left_fan, right_fan, left_speed, right_speed; |
373 |