ia64/linux-2.6.18-xen.hg

view drivers/char/i8k.c @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
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 */
19 #include <linux/module.h>
20 #include <linux/types.h>
21 #include <linux/init.h>
22 #include <linux/proc_fs.h>
23 #include <linux/seq_file.h>
24 #include <linux/dmi.h>
25 #include <asm/uaccess.h>
26 #include <asm/io.h>
28 #include <linux/i8k.h>
30 #define I8K_VERSION "1.14 21/02/2005"
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_SIG1 0xfea3
39 #define I8K_SMM_GET_DELL_SIG2 0xffa3
40 #define I8K_SMM_BIOS_VERSION 0x00a6
42 #define I8K_FAN_MULT 30
43 #define I8K_MAX_TEMP 127
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
52 #define I8K_POWER_AC 0x05
53 #define I8K_POWER_BATTERY 0x01
55 #define I8K_TEMPERATURE_BUG 1
57 static char bios_version[4];
59 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
60 MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
61 MODULE_LICENSE("GPL");
63 static int force;
64 module_param(force, bool, 0);
65 MODULE_PARM_DESC(force, "Force loading without checking for supported models");
67 static int ignore_dmi;
68 module_param(ignore_dmi, bool, 0);
69 MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
71 static int restricted;
72 module_param(restricted, bool, 0);
73 MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
75 static int power_status;
76 module_param(power_status, bool, 0600);
77 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
79 static int i8k_open_fs(struct inode *inode, struct file *file);
80 static int i8k_ioctl(struct inode *, struct file *, unsigned int,
81 unsigned long);
83 static const struct file_operations i8k_fops = {
84 .open = i8k_open_fs,
85 .read = seq_read,
86 .llseek = seq_lseek,
87 .release = single_release,
88 .ioctl = i8k_ioctl,
89 };
91 struct smm_regs {
92 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));
98 };
100 static inline char *i8k_get_dmi_data(int field)
101 {
102 char *dmi_data = dmi_get_system_info(field);
104 return dmi_data && *dmi_data ? dmi_data : "?";
105 }
107 /*
108 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
109 */
110 static int i8k_smm(struct smm_regs *regs)
111 {
112 int rc;
113 int eax = regs->eax;
115 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");
140 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
141 return -EINVAL;
143 return 0;
144 }
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 */
150 static int i8k_get_bios_version(void)
151 {
152 struct smm_regs regs = { .eax = I8K_SMM_BIOS_VERSION, };
154 return i8k_smm(&regs) ? : regs.eax;
155 }
157 /*
158 * Read the Fn key status.
159 */
160 static int i8k_get_fn_status(void)
161 {
162 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
163 int rc;
165 if ((rc = i8k_smm(&regs)) < 0)
166 return rc;
168 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 }
178 }
180 /*
181 * Read the power status.
182 */
183 static int i8k_get_power_status(void)
184 {
185 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
186 int rc;
188 if ((rc = i8k_smm(&regs)) < 0)
189 return rc;
191 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
192 }
194 /*
195 * Read the fan status.
196 */
197 static int i8k_get_fan_status(int fan)
198 {
199 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
201 regs.ebx = fan & 0xff;
202 return i8k_smm(&regs) ? : regs.eax & 0xff;
203 }
205 /*
206 * Read the fan speed in RPM.
207 */
208 static int i8k_get_fan_speed(int fan)
209 {
210 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
212 regs.ebx = fan & 0xff;
213 return i8k_smm(&regs) ? : (regs.eax & 0xffff) * I8K_FAN_MULT;
214 }
216 /*
217 * Set the fan speed (off, low, high). Returns the new fan status.
218 */
219 static int i8k_set_fan(int fan, int speed)
220 {
221 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
223 speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
224 regs.ebx = (fan & 0xff) | (speed << 8);
226 return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
227 }
229 /*
230 * Read the cpu temperature.
231 */
232 static int i8k_get_temp(int sensor)
233 {
234 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
235 int rc;
236 int temp;
238 #ifdef I8K_TEMPERATURE_BUG
239 static int prev;
240 #endif
241 regs.ebx = sensor & 0xff;
242 if ((rc = i8k_smm(&regs)) < 0)
243 return rc;
245 temp = regs.eax & 0xff;
247 #ifdef I8K_TEMPERATURE_BUG
248 /*
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 }
261 #endif
263 return temp;
264 }
266 static int i8k_get_dell_signature(int req_fn)
267 {
268 struct smm_regs regs = { .eax = req_fn, };
269 int rc;
271 if ((rc = i8k_smm(&regs)) < 0)
272 return rc;
274 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
275 }
277 static int i8k_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
278 unsigned long arg)
279 {
280 int val = 0;
281 int speed;
282 unsigned char buff[16];
283 int __user *argp = (int __user *)arg;
285 if (!argp)
286 return -EINVAL;
288 switch (cmd) {
289 case I8K_BIOS_VERSION:
290 val = i8k_get_bios_version();
291 break;
293 case I8K_MACHINE_ID:
294 memset(buff, 0, 16);
295 strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), sizeof(buff));
296 break;
298 case I8K_FN_STATUS:
299 val = i8k_get_fn_status();
300 break;
302 case I8K_POWER_STATUS:
303 val = i8k_get_power_status();
304 break;
306 case I8K_GET_TEMP:
307 val = i8k_get_temp(0);
308 break;
310 case I8K_GET_SPEED:
311 if (copy_from_user(&val, argp, sizeof(int)))
312 return -EFAULT;
314 val = i8k_get_fan_speed(val);
315 break;
317 case I8K_GET_FAN:
318 if (copy_from_user(&val, argp, sizeof(int)))
319 return -EFAULT;
321 val = i8k_get_fan_status(val);
322 break;
324 case I8K_SET_FAN:
325 if (restricted && !capable(CAP_SYS_ADMIN))
326 return -EPERM;
328 if (copy_from_user(&val, argp, sizeof(int)))
329 return -EFAULT;
331 if (copy_from_user(&speed, argp + 1, sizeof(int)))
332 return -EFAULT;
334 val = i8k_set_fan(val, speed);
335 break;
337 default:
338 return -EINVAL;
339 }
341 if (val < 0)
342 return val;
344 switch (cmd) {
345 case I8K_BIOS_VERSION:
346 if (copy_to_user(argp, &val, 4))
347 return -EFAULT;
349 break;
350 case I8K_MACHINE_ID:
351 if (copy_to_user(argp, buff, 16))
352 return -EFAULT;
354 break;
355 default:
356 if (copy_to_user(argp, &val, sizeof(int)))
357 return -EFAULT;
359 break;
360 }
362 return 0;
363 }
365 /*
366 * Print the information for /proc/i8k.
367 */
368 static int i8k_proc_show(struct seq_file *seq, void *offset)
369 {
370 int fn_key, cpu_temp, ac_power;
371 int left_fan, right_fan, left_speed, right_speed;
373 cpu_temp = i8k_get_temp(0); /* 11100 Ás */
374 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 Ás */
375 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 Ás */
376 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 Ás */
377 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 Ás */
378 fn_key = i8k_get_fn_status(); /* 750 Ás */
379 if (power_status)
380 ac_power = i8k_get_power_status(); /* 14700 Ás */
381 else
382 ac_power = -1;
384 /*
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 */
398 return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
399 I8K_PROC_FMT,
400 bios_version,
401 i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
402 cpu_temp,
403 left_fan, right_fan, left_speed, right_speed,
404 ac_power, fn_key);
405 }
407 static int i8k_open_fs(struct inode *inode, struct file *file)
408 {
409 return single_open(file, i8k_proc_show, NULL);
410 }
412 static 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 },
427 {
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 },
441 { }
442 };
444 /*
445 * Probe for the presence of a supported laptop.
446 */
447 static int __init i8k_probe(void)
448 {
449 char buff[4];
450 int version;
452 /*
453 * Get DMI information
454 */
455 if (!dmi_check_system(i8k_dmi_table)) {
456 if (!ignore_dmi && !force)
457 return -ENODEV;
459 printk(KERN_INFO "i8k: not running on a supported Dell system.\n");
460 printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n",
461 i8k_get_dmi_data(DMI_SYS_VENDOR),
462 i8k_get_dmi_data(DMI_PRODUCT_NAME),
463 i8k_get_dmi_data(DMI_BIOS_VERSION));
464 }
466 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), sizeof(bios_version));
468 /*
469 * Get SMM Dell signature
470 */
471 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
472 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
473 printk(KERN_ERR "i8k: unable to get SMM Dell signature\n");
474 if (!force)
475 return -ENODEV;
476 }
478 /*
479 * Get SMM BIOS version.
480 */
481 version = i8k_get_bios_version();
482 if (version <= 0) {
483 printk(KERN_WARNING "i8k: unable to get SMM BIOS version\n");
484 } else {
485 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 */
492 if (!dmi_get_system_info(DMI_BIOS_VERSION))
493 strlcpy(bios_version, buff, sizeof(bios_version));
495 /*
496 * Check if the two versions match.
497 */
498 if (strncmp(buff, bios_version, sizeof(bios_version)) != 0)
499 printk(KERN_WARNING "i8k: BIOS version mismatch: %s != %s\n",
500 buff, bios_version);
501 }
503 return 0;
504 }
506 static int __init i8k_init(void)
507 {
508 struct proc_dir_entry *proc_i8k;
510 /* Are we running on an supported laptop? */
511 if (i8k_probe())
512 return -ENODEV;
514 /* Register the proc entry */
515 proc_i8k = create_proc_entry("i8k", 0, NULL);
516 if (!proc_i8k)
517 return -ENOENT;
519 proc_i8k->proc_fops = &i8k_fops;
520 proc_i8k->owner = THIS_MODULE;
522 printk(KERN_INFO
523 "Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n",
524 I8K_VERSION);
526 return 0;
527 }
529 static void __exit i8k_exit(void)
530 {
531 remove_proc_entry("i8k", NULL);
532 }
534 module_init(i8k_init);
535 module_exit(i8k_exit);