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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 | ||
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 | |
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(®s) ? : regs.eax; |
1da177e4 LT |
152 | } |
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; |
161 | ||
8378b924 | 162 | if ((rc = i8k_smm(®s)) < 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; |
184 | ||
8378b924 | 185 | if ((rc = i8k_smm(®s)) < 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(®s) ? : 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(®s) ? : (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(®s) ? : 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; |
233 | int temp; | |
1da177e4 LT |
234 | |
235 | #ifdef I8K_TEMPERATURE_BUG | |
8378b924 | 236 | static int prev; |
1da177e4 LT |
237 | #endif |
238 | ||
8378b924 | 239 | if ((rc = i8k_smm(®s)) < 0) |
dec63ec3 | 240 | return rc; |
8378b924 | 241 | |
dec63ec3 | 242 | temp = regs.eax & 0xff; |
1da177e4 LT |
243 | |
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 |
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(®s)) < 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); |
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); |
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 | |
325 | if (copy_from_user(&val, argp, sizeof(int))) | |
dec63ec3 | 326 | return -EFAULT; |
8378b924 DT |
327 | |
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); |
332 | break; | |
1da177e4 | 333 | |
dec63ec3 DT |
334 | default: |
335 | return -EINVAL; | |
1da177e4 | 336 | } |
1da177e4 | 337 | |
8378b924 | 338 | if (val < 0) |
dec63ec3 | 339 | return val; |
1da177e4 | 340 | |
dec63ec3 DT |
341 | switch (cmd) { |
342 | case I8K_BIOS_VERSION: | |
8378b924 | 343 | if (copy_to_user(argp, &val, 4)) |
dec63ec3 | 344 | return -EFAULT; |
8378b924 | 345 | |
dec63ec3 DT |
346 | break; |
347 | case I8K_MACHINE_ID: | |
8378b924 | 348 | if (copy_to_user(argp, buff, 16)) |
dec63ec3 | 349 | return -EFAULT; |
8378b924 | 350 | |
dec63ec3 DT |
351 | break; |
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 |