1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * dell-smm-hwmon.c -- Linux driver for accessing the SMM BIOS on Dell laptops. |
4 | * |
5 | * Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org> |
6 | * |
7 | * Hwmon integration: |
8 | * Copyright (C) 2011 Jean Delvare <jdelvare@suse.de> |
9 | * Copyright (C) 2013, 2014 Guenter Roeck <linux@roeck-us.net> |
10 | * Copyright (C) 2014, 2015 Pali Rohár <pali@kernel.org> |
11 | */ |
12 | |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | |
15 | #include <linux/capability.h> |
16 | #include <linux/cpu.h> |
17 | #include <linux/ctype.h> |
18 | #include <linux/delay.h> |
19 | #include <linux/dmi.h> |
20 | #include <linux/err.h> |
21 | #include <linux/errno.h> |
22 | #include <linux/hwmon.h> |
23 | #include <linux/init.h> |
24 | #include <linux/kconfig.h> |
25 | #include <linux/kernel.h> |
26 | #include <linux/module.h> |
27 | #include <linux/mutex.h> |
28 | #include <linux/platform_device.h> |
29 | #include <linux/proc_fs.h> |
30 | #include <linux/seq_file.h> |
31 | #include <linux/slab.h> |
32 | #include <linux/smp.h> |
33 | #include <linux/string.h> |
34 | #include <linux/thermal.h> |
35 | #include <linux/types.h> |
36 | #include <linux/uaccess.h> |
37 | |
38 | #include <linux/i8k.h> |
39 | |
40 | #define I8K_SMM_FN_STATUS 0x0025 |
41 | #define I8K_SMM_POWER_STATUS 0x0069 |
42 | #define I8K_SMM_SET_FAN 0x01a3 |
43 | #define I8K_SMM_GET_FAN 0x00a3 |
44 | #define I8K_SMM_GET_SPEED 0x02a3 |
45 | #define I8K_SMM_GET_FAN_TYPE 0x03a3 |
46 | #define I8K_SMM_GET_NOM_SPEED 0x04a3 |
47 | #define I8K_SMM_GET_TEMP 0x10a3 |
48 | #define I8K_SMM_GET_TEMP_TYPE 0x11a3 |
49 | #define I8K_SMM_GET_DELL_SIG1 0xfea3 |
50 | #define I8K_SMM_GET_DELL_SIG2 0xffa3 |
51 | |
52 | /* in usecs */ |
53 | #define DELL_SMM_MAX_DURATION 250000 |
54 | |
55 | #define I8K_FAN_MULT 30 |
56 | #define I8K_FAN_RPM_THRESHOLD 1000 |
57 | #define I8K_MAX_TEMP 127 |
58 | |
59 | #define I8K_FN_NONE 0x00 |
60 | #define I8K_FN_UP 0x01 |
61 | #define I8K_FN_DOWN 0x02 |
62 | #define I8K_FN_MUTE 0x04 |
63 | #define I8K_FN_MASK 0x07 |
64 | #define I8K_FN_SHIFT 8 |
65 | |
66 | #define I8K_POWER_AC 0x05 |
67 | #define I8K_POWER_BATTERY 0x01 |
68 | |
69 | #define DELL_SMM_NO_TEMP 10 |
70 | #define DELL_SMM_NO_FANS 3 |
71 | |
72 | struct dell_smm_data { |
73 | struct mutex i8k_mutex; /* lock for sensors writes */ |
74 | char bios_version[4]; |
75 | char bios_machineid[16]; |
76 | uint i8k_fan_mult; |
77 | uint i8k_pwm_mult; |
78 | uint i8k_fan_max; |
79 | bool disallow_fan_type_call; |
80 | bool disallow_fan_support; |
81 | unsigned int manual_fan; |
82 | unsigned int auto_fan; |
83 | int temp_type[DELL_SMM_NO_TEMP]; |
84 | bool fan[DELL_SMM_NO_FANS]; |
85 | int fan_type[DELL_SMM_NO_FANS]; |
86 | int *fan_nominal_speed[DELL_SMM_NO_FANS]; |
87 | }; |
88 | |
89 | struct dell_smm_cooling_data { |
90 | u8 fan_num; |
91 | struct dell_smm_data *data; |
92 | }; |
93 | |
94 | MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)" ); |
95 | MODULE_AUTHOR("Pali Rohár <pali@kernel.org>" ); |
96 | MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver" ); |
97 | MODULE_LICENSE("GPL" ); |
98 | MODULE_ALIAS("i8k" ); |
99 | |
100 | static bool force; |
101 | module_param_unsafe(force, bool, 0); |
102 | MODULE_PARM_DESC(force, "Force loading without checking for supported models and features" ); |
103 | |
104 | static bool ignore_dmi; |
105 | module_param(ignore_dmi, bool, 0); |
106 | MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match" ); |
107 | |
108 | #if IS_ENABLED(CONFIG_I8K) |
109 | static bool restricted = true; |
110 | module_param(restricted, bool, 0); |
111 | MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)" ); |
112 | |
113 | static bool power_status; |
114 | module_param(power_status, bool, 0600); |
115 | MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)" ); |
116 | #endif |
117 | |
118 | static uint fan_mult; |
119 | module_param(fan_mult, uint, 0); |
120 | MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)" ); |
121 | |
122 | static uint fan_max; |
123 | module_param(fan_max, uint, 0); |
124 | MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)" ); |
125 | |
126 | struct smm_regs { |
127 | unsigned int eax; |
128 | unsigned int ebx; |
129 | unsigned int ecx; |
130 | unsigned int edx; |
131 | unsigned int esi; |
132 | unsigned int edi; |
133 | }; |
134 | |
135 | static const char * const temp_labels[] = { |
136 | "CPU" , |
137 | "GPU" , |
138 | "SODIMM" , |
139 | "Other" , |
140 | "Ambient" , |
141 | "Other" , |
142 | }; |
143 | |
144 | static const char * const fan_labels[] = { |
145 | "Processor Fan" , |
146 | "Motherboard Fan" , |
147 | "Video Fan" , |
148 | "Power Supply Fan" , |
149 | "Chipset Fan" , |
150 | "Other Fan" , |
151 | }; |
152 | |
153 | static const char * const docking_labels[] = { |
154 | "Docking Processor Fan" , |
155 | "Docking Motherboard Fan" , |
156 | "Docking Video Fan" , |
157 | "Docking Power Supply Fan" , |
158 | "Docking Chipset Fan" , |
159 | "Docking Other Fan" , |
160 | }; |
161 | |
162 | static inline const char __init *i8k_get_dmi_data(int field) |
163 | { |
164 | const char *dmi_data = dmi_get_system_info(field); |
165 | |
166 | return dmi_data && *dmi_data ? dmi_data : "?" ; |
167 | } |
168 | |
169 | /* |
170 | * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard. |
171 | */ |
172 | static int i8k_smm_func(void *par) |
173 | { |
174 | ktime_t calltime = ktime_get(); |
175 | struct smm_regs *regs = par; |
176 | int eax = regs->eax; |
177 | int ebx = regs->ebx; |
178 | unsigned char carry; |
179 | long long duration; |
180 | |
181 | /* SMM requires CPU 0 */ |
182 | if (smp_processor_id() != 0) |
183 | return -EBUSY; |
184 | |
185 | asm volatile("out %%al,$0xb2\n\t" |
186 | "out %%al,$0x84\n\t" |
187 | "setc %0\n" |
188 | : "=mr" (carry), |
189 | "+a" (regs->eax), |
190 | "+b" (regs->ebx), |
191 | "+c" (regs->ecx), |
192 | "+d" (regs->edx), |
193 | "+S" (regs->esi), |
194 | "+D" (regs->edi)); |
195 | |
196 | duration = ktime_us_delta(later: ktime_get(), earlier: calltime); |
197 | pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x carry: %d (took %7lld usecs)\n" , |
198 | eax, ebx, regs->eax & 0xffff, carry, duration); |
199 | |
200 | if (duration > DELL_SMM_MAX_DURATION) |
201 | pr_warn_once("SMM call took %lld usecs!\n" , duration); |
202 | |
203 | if (carry || (regs->eax & 0xffff) == 0xffff || regs->eax == eax) |
204 | return -EINVAL; |
205 | |
206 | return 0; |
207 | } |
208 | |
209 | /* |
210 | * Call the System Management Mode BIOS. |
211 | */ |
212 | static int i8k_smm(struct smm_regs *regs) |
213 | { |
214 | int ret; |
215 | |
216 | cpus_read_lock(); |
217 | ret = smp_call_on_cpu(cpu: 0, func: i8k_smm_func, par: regs, phys: true); |
218 | cpus_read_unlock(); |
219 | |
220 | return ret; |
221 | } |
222 | |
223 | /* |
224 | * Read the fan status. |
225 | */ |
226 | static int i8k_get_fan_status(const struct dell_smm_data *data, u8 fan) |
227 | { |
228 | struct smm_regs regs = { |
229 | .eax = I8K_SMM_GET_FAN, |
230 | .ebx = fan, |
231 | }; |
232 | |
233 | if (data->disallow_fan_support) |
234 | return -EINVAL; |
235 | |
236 | return i8k_smm(regs: ®s) ? : regs.eax & 0xff; |
237 | } |
238 | |
239 | /* |
240 | * Read the fan speed in RPM. |
241 | */ |
242 | static int i8k_get_fan_speed(const struct dell_smm_data *data, u8 fan) |
243 | { |
244 | struct smm_regs regs = { |
245 | .eax = I8K_SMM_GET_SPEED, |
246 | .ebx = fan, |
247 | }; |
248 | |
249 | if (data->disallow_fan_support) |
250 | return -EINVAL; |
251 | |
252 | return i8k_smm(regs: ®s) ? : (regs.eax & 0xffff) * data->i8k_fan_mult; |
253 | } |
254 | |
255 | /* |
256 | * Read the fan type. |
257 | */ |
258 | static int _i8k_get_fan_type(const struct dell_smm_data *data, u8 fan) |
259 | { |
260 | struct smm_regs regs = { |
261 | .eax = I8K_SMM_GET_FAN_TYPE, |
262 | .ebx = fan, |
263 | }; |
264 | |
265 | if (data->disallow_fan_support || data->disallow_fan_type_call) |
266 | return -EINVAL; |
267 | |
268 | return i8k_smm(regs: ®s) ? : regs.eax & 0xff; |
269 | } |
270 | |
271 | static int i8k_get_fan_type(struct dell_smm_data *data, u8 fan) |
272 | { |
273 | /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */ |
274 | if (data->fan_type[fan] == INT_MIN) |
275 | data->fan_type[fan] = _i8k_get_fan_type(data, fan); |
276 | |
277 | return data->fan_type[fan]; |
278 | } |
279 | |
280 | /* |
281 | * Read the fan nominal rpm for specific fan speed. |
282 | */ |
283 | static int __init i8k_get_fan_nominal_speed(const struct dell_smm_data *data, u8 fan, int speed) |
284 | { |
285 | struct smm_regs regs = { |
286 | .eax = I8K_SMM_GET_NOM_SPEED, |
287 | .ebx = fan | (speed << 8), |
288 | }; |
289 | |
290 | if (data->disallow_fan_support) |
291 | return -EINVAL; |
292 | |
293 | return i8k_smm(regs: ®s) ? : (regs.eax & 0xffff); |
294 | } |
295 | |
296 | /* |
297 | * Enable or disable automatic BIOS fan control support |
298 | */ |
299 | static int i8k_enable_fan_auto_mode(const struct dell_smm_data *data, bool enable) |
300 | { |
301 | struct smm_regs regs = { }; |
302 | |
303 | if (data->disallow_fan_support) |
304 | return -EINVAL; |
305 | |
306 | regs.eax = enable ? data->auto_fan : data->manual_fan; |
307 | return i8k_smm(regs: ®s); |
308 | } |
309 | |
310 | /* |
311 | * Set the fan speed (off, low, high, ...). |
312 | */ |
313 | static int i8k_set_fan(const struct dell_smm_data *data, u8 fan, int speed) |
314 | { |
315 | struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, }; |
316 | |
317 | if (data->disallow_fan_support) |
318 | return -EINVAL; |
319 | |
320 | speed = (speed < 0) ? 0 : ((speed > data->i8k_fan_max) ? data->i8k_fan_max : speed); |
321 | regs.ebx = fan | (speed << 8); |
322 | |
323 | return i8k_smm(regs: ®s); |
324 | } |
325 | |
326 | static int __init i8k_get_temp_type(u8 sensor) |
327 | { |
328 | struct smm_regs regs = { |
329 | .eax = I8K_SMM_GET_TEMP_TYPE, |
330 | .ebx = sensor, |
331 | }; |
332 | |
333 | return i8k_smm(regs: ®s) ? : regs.eax & 0xff; |
334 | } |
335 | |
336 | /* |
337 | * Read the cpu temperature. |
338 | */ |
339 | static int _i8k_get_temp(u8 sensor) |
340 | { |
341 | struct smm_regs regs = { |
342 | .eax = I8K_SMM_GET_TEMP, |
343 | .ebx = sensor, |
344 | }; |
345 | |
346 | return i8k_smm(regs: ®s) ? : regs.eax & 0xff; |
347 | } |
348 | |
349 | static int i8k_get_temp(u8 sensor) |
350 | { |
351 | int temp = _i8k_get_temp(sensor); |
352 | |
353 | /* |
354 | * Sometimes the temperature sensor returns 0x99, which is out of range. |
355 | * In this case we retry (once) before returning an error. |
356 | # 1003655137 00000058 00005a4b |
357 | # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees |
358 | # 1003655139 00000054 00005c52 |
359 | */ |
360 | if (temp == 0x99) { |
361 | msleep(msecs: 100); |
362 | temp = _i8k_get_temp(sensor); |
363 | } |
364 | /* |
365 | * Return -ENODATA for all invalid temperatures. |
366 | * |
367 | * Known instances are the 0x99 value as seen above as well as |
368 | * 0xc1 (193), which may be returned when trying to read the GPU |
369 | * temperature if the system supports a GPU and it is currently |
370 | * turned off. |
371 | */ |
372 | if (temp > I8K_MAX_TEMP) |
373 | return -ENODATA; |
374 | |
375 | return temp; |
376 | } |
377 | |
378 | static int __init i8k_get_dell_signature(int req_fn) |
379 | { |
380 | struct smm_regs regs = { .eax = req_fn, }; |
381 | int rc; |
382 | |
383 | rc = i8k_smm(regs: ®s); |
384 | if (rc < 0) |
385 | return rc; |
386 | |
387 | return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1; |
388 | } |
389 | |
390 | #if IS_ENABLED(CONFIG_I8K) |
391 | |
392 | /* |
393 | * Read the Fn key status. |
394 | */ |
395 | static int i8k_get_fn_status(void) |
396 | { |
397 | struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, }; |
398 | int rc; |
399 | |
400 | rc = i8k_smm(regs: ®s); |
401 | if (rc < 0) |
402 | return rc; |
403 | |
404 | switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) { |
405 | case I8K_FN_UP: |
406 | return I8K_VOL_UP; |
407 | case I8K_FN_DOWN: |
408 | return I8K_VOL_DOWN; |
409 | case I8K_FN_MUTE: |
410 | return I8K_VOL_MUTE; |
411 | default: |
412 | return 0; |
413 | } |
414 | } |
415 | |
416 | /* |
417 | * Read the power status. |
418 | */ |
419 | static int i8k_get_power_status(void) |
420 | { |
421 | struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, }; |
422 | int rc; |
423 | |
424 | rc = i8k_smm(regs: ®s); |
425 | if (rc < 0) |
426 | return rc; |
427 | |
428 | return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY; |
429 | } |
430 | |
431 | /* |
432 | * Procfs interface |
433 | */ |
434 | |
435 | static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) |
436 | { |
437 | struct dell_smm_data *data = pde_data(inode: file_inode(f: fp)); |
438 | int __user *argp = (int __user *)arg; |
439 | int speed, err; |
440 | int val = 0; |
441 | |
442 | if (!argp) |
443 | return -EINVAL; |
444 | |
445 | switch (cmd) { |
446 | case I8K_BIOS_VERSION: |
447 | if (!isdigit(c: data->bios_version[0]) || !isdigit(c: data->bios_version[1]) || |
448 | !isdigit(c: data->bios_version[2])) |
449 | return -EINVAL; |
450 | |
451 | val = (data->bios_version[0] << 16) | |
452 | (data->bios_version[1] << 8) | data->bios_version[2]; |
453 | |
454 | if (copy_to_user(to: argp, from: &val, n: sizeof(val))) |
455 | return -EFAULT; |
456 | |
457 | return 0; |
458 | case I8K_MACHINE_ID: |
459 | if (restricted && !capable(CAP_SYS_ADMIN)) |
460 | return -EPERM; |
461 | |
462 | if (copy_to_user(to: argp, from: data->bios_machineid, n: sizeof(data->bios_machineid))) |
463 | return -EFAULT; |
464 | |
465 | return 0; |
466 | case I8K_FN_STATUS: |
467 | val = i8k_get_fn_status(); |
468 | break; |
469 | |
470 | case I8K_POWER_STATUS: |
471 | val = i8k_get_power_status(); |
472 | break; |
473 | |
474 | case I8K_GET_TEMP: |
475 | val = i8k_get_temp(sensor: 0); |
476 | break; |
477 | |
478 | case I8K_GET_SPEED: |
479 | if (copy_from_user(to: &val, from: argp, n: sizeof(int))) |
480 | return -EFAULT; |
481 | |
482 | if (val > U8_MAX || val < 0) |
483 | return -EINVAL; |
484 | |
485 | val = i8k_get_fan_speed(data, fan: val); |
486 | break; |
487 | |
488 | case I8K_GET_FAN: |
489 | if (copy_from_user(to: &val, from: argp, n: sizeof(int))) |
490 | return -EFAULT; |
491 | |
492 | if (val > U8_MAX || val < 0) |
493 | return -EINVAL; |
494 | |
495 | val = i8k_get_fan_status(data, fan: val); |
496 | break; |
497 | |
498 | case I8K_SET_FAN: |
499 | if (restricted && !capable(CAP_SYS_ADMIN)) |
500 | return -EPERM; |
501 | |
502 | if (copy_from_user(to: &val, from: argp, n: sizeof(int))) |
503 | return -EFAULT; |
504 | |
505 | if (val > U8_MAX || val < 0) |
506 | return -EINVAL; |
507 | |
508 | if (copy_from_user(to: &speed, from: argp + 1, n: sizeof(int))) |
509 | return -EFAULT; |
510 | |
511 | mutex_lock(&data->i8k_mutex); |
512 | err = i8k_set_fan(data, fan: val, speed); |
513 | if (err < 0) |
514 | val = err; |
515 | else |
516 | val = i8k_get_fan_status(data, fan: val); |
517 | mutex_unlock(lock: &data->i8k_mutex); |
518 | break; |
519 | |
520 | default: |
521 | return -ENOIOCTLCMD; |
522 | } |
523 | |
524 | if (val < 0) |
525 | return val; |
526 | |
527 | if (copy_to_user(to: argp, from: &val, n: sizeof(int))) |
528 | return -EFAULT; |
529 | |
530 | return 0; |
531 | } |
532 | |
533 | /* |
534 | * Print the information for /proc/i8k. |
535 | */ |
536 | static int i8k_proc_show(struct seq_file *seq, void *offset) |
537 | { |
538 | struct dell_smm_data *data = seq->private; |
539 | int fn_key, cpu_temp, ac_power; |
540 | int left_fan, right_fan, left_speed, right_speed; |
541 | |
542 | cpu_temp = i8k_get_temp(sensor: 0); /* 11100 µs */ |
543 | left_fan = i8k_get_fan_status(data, I8K_FAN_LEFT); /* 580 µs */ |
544 | right_fan = i8k_get_fan_status(data, I8K_FAN_RIGHT); /* 580 µs */ |
545 | left_speed = i8k_get_fan_speed(data, I8K_FAN_LEFT); /* 580 µs */ |
546 | right_speed = i8k_get_fan_speed(data, I8K_FAN_RIGHT); /* 580 µs */ |
547 | fn_key = i8k_get_fn_status(); /* 750 µs */ |
548 | if (power_status) |
549 | ac_power = i8k_get_power_status(); /* 14700 µs */ |
550 | else |
551 | ac_power = -1; |
552 | |
553 | /* |
554 | * Info: |
555 | * |
556 | * 1) Format version (this will change if format changes) |
557 | * 2) BIOS version |
558 | * 3) BIOS machine ID |
559 | * 4) Cpu temperature |
560 | * 5) Left fan status |
561 | * 6) Right fan status |
562 | * 7) Left fan speed |
563 | * 8) Right fan speed |
564 | * 9) AC power |
565 | * 10) Fn Key status |
566 | */ |
567 | seq_printf(m: seq, fmt: "%s %s %s %d %d %d %d %d %d %d\n" , |
568 | I8K_PROC_FMT, |
569 | data->bios_version, |
570 | (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : data->bios_machineid, |
571 | cpu_temp, |
572 | left_fan, right_fan, left_speed, right_speed, |
573 | ac_power, fn_key); |
574 | |
575 | return 0; |
576 | } |
577 | |
578 | static int i8k_open_fs(struct inode *inode, struct file *file) |
579 | { |
580 | return single_open(file, i8k_proc_show, pde_data(inode)); |
581 | } |
582 | |
583 | static const struct proc_ops i8k_proc_ops = { |
584 | .proc_open = i8k_open_fs, |
585 | .proc_read = seq_read, |
586 | .proc_lseek = seq_lseek, |
587 | .proc_release = single_release, |
588 | .proc_ioctl = i8k_ioctl, |
589 | }; |
590 | |
591 | static void i8k_exit_procfs(void *param) |
592 | { |
593 | remove_proc_entry("i8k" , NULL); |
594 | } |
595 | |
596 | static void __init i8k_init_procfs(struct device *dev) |
597 | { |
598 | struct dell_smm_data *data = dev_get_drvdata(dev); |
599 | |
600 | /* Only register exit function if creation was successful */ |
601 | if (proc_create_data("i8k" , 0, NULL, &i8k_proc_ops, data)) |
602 | devm_add_action_or_reset(dev, i8k_exit_procfs, NULL); |
603 | } |
604 | |
605 | #else |
606 | |
607 | static void __init i8k_init_procfs(struct device *dev) |
608 | { |
609 | } |
610 | |
611 | #endif |
612 | |
613 | static int dell_smm_get_max_state(struct thermal_cooling_device *dev, unsigned long *state) |
614 | { |
615 | struct dell_smm_cooling_data *cdata = dev->devdata; |
616 | |
617 | *state = cdata->data->i8k_fan_max; |
618 | |
619 | return 0; |
620 | } |
621 | |
622 | static int dell_smm_get_cur_state(struct thermal_cooling_device *dev, unsigned long *state) |
623 | { |
624 | struct dell_smm_cooling_data *cdata = dev->devdata; |
625 | int ret; |
626 | |
627 | ret = i8k_get_fan_status(data: cdata->data, fan: cdata->fan_num); |
628 | if (ret < 0) |
629 | return ret; |
630 | |
631 | *state = ret; |
632 | |
633 | return 0; |
634 | } |
635 | |
636 | static int dell_smm_set_cur_state(struct thermal_cooling_device *dev, unsigned long state) |
637 | { |
638 | struct dell_smm_cooling_data *cdata = dev->devdata; |
639 | struct dell_smm_data *data = cdata->data; |
640 | int ret; |
641 | |
642 | if (state > data->i8k_fan_max) |
643 | return -EINVAL; |
644 | |
645 | mutex_lock(&data->i8k_mutex); |
646 | ret = i8k_set_fan(data, fan: cdata->fan_num, speed: (int)state); |
647 | mutex_unlock(lock: &data->i8k_mutex); |
648 | |
649 | return ret; |
650 | } |
651 | |
652 | static const struct thermal_cooling_device_ops dell_smm_cooling_ops = { |
653 | .get_max_state = dell_smm_get_max_state, |
654 | .get_cur_state = dell_smm_get_cur_state, |
655 | .set_cur_state = dell_smm_set_cur_state, |
656 | }; |
657 | |
658 | static umode_t dell_smm_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, |
659 | int channel) |
660 | { |
661 | const struct dell_smm_data *data = drvdata; |
662 | |
663 | switch (type) { |
664 | case hwmon_temp: |
665 | switch (attr) { |
666 | case hwmon_temp_input: |
667 | /* _i8k_get_temp() is fine since we do not care about the actual value */ |
668 | if (data->temp_type[channel] >= 0 || _i8k_get_temp(sensor: channel) >= 0) |
669 | return 0444; |
670 | |
671 | break; |
672 | case hwmon_temp_label: |
673 | if (data->temp_type[channel] >= 0) |
674 | return 0444; |
675 | |
676 | break; |
677 | default: |
678 | break; |
679 | } |
680 | break; |
681 | case hwmon_fan: |
682 | if (data->disallow_fan_support) |
683 | break; |
684 | |
685 | switch (attr) { |
686 | case hwmon_fan_input: |
687 | if (data->fan[channel]) |
688 | return 0444; |
689 | |
690 | break; |
691 | case hwmon_fan_label: |
692 | if (data->fan[channel] && !data->disallow_fan_type_call) |
693 | return 0444; |
694 | |
695 | break; |
696 | case hwmon_fan_min: |
697 | case hwmon_fan_max: |
698 | case hwmon_fan_target: |
699 | if (data->fan_nominal_speed[channel]) |
700 | return 0444; |
701 | |
702 | break; |
703 | default: |
704 | break; |
705 | } |
706 | break; |
707 | case hwmon_pwm: |
708 | if (data->disallow_fan_support) |
709 | break; |
710 | |
711 | switch (attr) { |
712 | case hwmon_pwm_input: |
713 | if (data->fan[channel]) |
714 | return 0644; |
715 | |
716 | break; |
717 | case hwmon_pwm_enable: |
718 | if (data->auto_fan) |
719 | /* |
720 | * There is no command for retrieve the current status |
721 | * from BIOS, and userspace/firmware itself can change |
722 | * it. |
723 | * Thus we can only provide write-only access for now. |
724 | */ |
725 | return 0200; |
726 | |
727 | break; |
728 | default: |
729 | break; |
730 | } |
731 | break; |
732 | default: |
733 | break; |
734 | } |
735 | |
736 | return 0; |
737 | } |
738 | |
739 | static int dell_smm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, |
740 | long *val) |
741 | { |
742 | struct dell_smm_data *data = dev_get_drvdata(dev); |
743 | int mult = data->i8k_fan_mult; |
744 | int ret; |
745 | |
746 | switch (type) { |
747 | case hwmon_temp: |
748 | switch (attr) { |
749 | case hwmon_temp_input: |
750 | ret = i8k_get_temp(sensor: channel); |
751 | if (ret < 0) |
752 | return ret; |
753 | |
754 | *val = ret * 1000; |
755 | |
756 | return 0; |
757 | default: |
758 | break; |
759 | } |
760 | break; |
761 | case hwmon_fan: |
762 | switch (attr) { |
763 | case hwmon_fan_input: |
764 | ret = i8k_get_fan_speed(data, fan: channel); |
765 | if (ret < 0) |
766 | return ret; |
767 | |
768 | *val = ret; |
769 | |
770 | return 0; |
771 | case hwmon_fan_min: |
772 | *val = data->fan_nominal_speed[channel][0] * mult; |
773 | |
774 | return 0; |
775 | case hwmon_fan_max: |
776 | *val = data->fan_nominal_speed[channel][data->i8k_fan_max] * mult; |
777 | |
778 | return 0; |
779 | case hwmon_fan_target: |
780 | ret = i8k_get_fan_status(data, fan: channel); |
781 | if (ret < 0) |
782 | return ret; |
783 | |
784 | if (ret > data->i8k_fan_max) |
785 | ret = data->i8k_fan_max; |
786 | |
787 | *val = data->fan_nominal_speed[channel][ret] * mult; |
788 | |
789 | return 0; |
790 | default: |
791 | break; |
792 | } |
793 | break; |
794 | case hwmon_pwm: |
795 | switch (attr) { |
796 | case hwmon_pwm_input: |
797 | ret = i8k_get_fan_status(data, fan: channel); |
798 | if (ret < 0) |
799 | return ret; |
800 | |
801 | *val = clamp_val(ret * data->i8k_pwm_mult, 0, 255); |
802 | |
803 | return 0; |
804 | default: |
805 | break; |
806 | } |
807 | break; |
808 | default: |
809 | break; |
810 | } |
811 | |
812 | return -EOPNOTSUPP; |
813 | } |
814 | |
815 | static const char *dell_smm_fan_label(struct dell_smm_data *data, int channel) |
816 | { |
817 | bool dock = false; |
818 | int type = i8k_get_fan_type(data, fan: channel); |
819 | |
820 | if (type < 0) |
821 | return ERR_PTR(error: type); |
822 | |
823 | if (type & 0x10) { |
824 | dock = true; |
825 | type &= 0x0F; |
826 | } |
827 | |
828 | if (type >= ARRAY_SIZE(fan_labels)) |
829 | type = ARRAY_SIZE(fan_labels) - 1; |
830 | |
831 | return dock ? docking_labels[type] : fan_labels[type]; |
832 | } |
833 | |
834 | static int dell_smm_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr, |
835 | int channel, const char **str) |
836 | { |
837 | struct dell_smm_data *data = dev_get_drvdata(dev); |
838 | |
839 | switch (type) { |
840 | case hwmon_temp: |
841 | switch (attr) { |
842 | case hwmon_temp_label: |
843 | *str = temp_labels[data->temp_type[channel]]; |
844 | return 0; |
845 | default: |
846 | break; |
847 | } |
848 | break; |
849 | case hwmon_fan: |
850 | switch (attr) { |
851 | case hwmon_fan_label: |
852 | *str = dell_smm_fan_label(data, channel); |
853 | return PTR_ERR_OR_ZERO(ptr: *str); |
854 | default: |
855 | break; |
856 | } |
857 | break; |
858 | default: |
859 | break; |
860 | } |
861 | |
862 | return -EOPNOTSUPP; |
863 | } |
864 | |
865 | static int dell_smm_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, |
866 | long val) |
867 | { |
868 | struct dell_smm_data *data = dev_get_drvdata(dev); |
869 | unsigned long pwm; |
870 | bool enable; |
871 | int err; |
872 | |
873 | switch (type) { |
874 | case hwmon_pwm: |
875 | switch (attr) { |
876 | case hwmon_pwm_input: |
877 | pwm = clamp_val(DIV_ROUND_CLOSEST(val, data->i8k_pwm_mult), 0, |
878 | data->i8k_fan_max); |
879 | |
880 | mutex_lock(&data->i8k_mutex); |
881 | err = i8k_set_fan(data, fan: channel, speed: pwm); |
882 | mutex_unlock(lock: &data->i8k_mutex); |
883 | |
884 | if (err < 0) |
885 | return err; |
886 | |
887 | return 0; |
888 | case hwmon_pwm_enable: |
889 | if (!val) |
890 | return -EINVAL; |
891 | |
892 | if (val == 1) |
893 | enable = false; |
894 | else |
895 | enable = true; |
896 | |
897 | mutex_lock(&data->i8k_mutex); |
898 | err = i8k_enable_fan_auto_mode(data, enable); |
899 | mutex_unlock(lock: &data->i8k_mutex); |
900 | |
901 | if (err < 0) |
902 | return err; |
903 | |
904 | return 0; |
905 | default: |
906 | break; |
907 | } |
908 | break; |
909 | default: |
910 | break; |
911 | } |
912 | |
913 | return -EOPNOTSUPP; |
914 | } |
915 | |
916 | static const struct hwmon_ops dell_smm_ops = { |
917 | .is_visible = dell_smm_is_visible, |
918 | .read = dell_smm_read, |
919 | .read_string = dell_smm_read_string, |
920 | .write = dell_smm_write, |
921 | }; |
922 | |
923 | static const struct hwmon_channel_info * const dell_smm_info[] = { |
924 | HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), |
925 | HWMON_CHANNEL_INFO(temp, |
926 | HWMON_T_INPUT | HWMON_T_LABEL, |
927 | HWMON_T_INPUT | HWMON_T_LABEL, |
928 | HWMON_T_INPUT | HWMON_T_LABEL, |
929 | HWMON_T_INPUT | HWMON_T_LABEL, |
930 | HWMON_T_INPUT | HWMON_T_LABEL, |
931 | HWMON_T_INPUT | HWMON_T_LABEL, |
932 | HWMON_T_INPUT | HWMON_T_LABEL, |
933 | HWMON_T_INPUT | HWMON_T_LABEL, |
934 | HWMON_T_INPUT | HWMON_T_LABEL, |
935 | HWMON_T_INPUT | HWMON_T_LABEL |
936 | ), |
937 | HWMON_CHANNEL_INFO(fan, |
938 | HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX | |
939 | HWMON_F_TARGET, |
940 | HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX | |
941 | HWMON_F_TARGET, |
942 | HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX | |
943 | HWMON_F_TARGET |
944 | ), |
945 | HWMON_CHANNEL_INFO(pwm, |
946 | HWMON_PWM_INPUT | HWMON_PWM_ENABLE, |
947 | HWMON_PWM_INPUT, |
948 | HWMON_PWM_INPUT |
949 | ), |
950 | NULL |
951 | }; |
952 | |
953 | static const struct hwmon_chip_info dell_smm_chip_info = { |
954 | .ops = &dell_smm_ops, |
955 | .info = dell_smm_info, |
956 | }; |
957 | |
958 | static int __init dell_smm_init_cdev(struct device *dev, u8 fan_num) |
959 | { |
960 | struct dell_smm_data *data = dev_get_drvdata(dev); |
961 | struct thermal_cooling_device *cdev; |
962 | struct dell_smm_cooling_data *cdata; |
963 | int ret = 0; |
964 | char *name; |
965 | |
966 | name = kasprintf(GFP_KERNEL, fmt: "dell-smm-fan%u" , fan_num + 1); |
967 | if (!name) |
968 | return -ENOMEM; |
969 | |
970 | cdata = devm_kmalloc(dev, size: sizeof(*cdata), GFP_KERNEL); |
971 | if (cdata) { |
972 | cdata->fan_num = fan_num; |
973 | cdata->data = data; |
974 | cdev = devm_thermal_of_cooling_device_register(dev, NULL, type: name, devdata: cdata, |
975 | ops: &dell_smm_cooling_ops); |
976 | if (IS_ERR(ptr: cdev)) { |
977 | devm_kfree(dev, p: cdata); |
978 | ret = PTR_ERR(ptr: cdev); |
979 | } |
980 | } else { |
981 | ret = -ENOMEM; |
982 | } |
983 | |
984 | kfree(objp: name); |
985 | |
986 | return ret; |
987 | } |
988 | |
989 | static int __init dell_smm_init_hwmon(struct device *dev) |
990 | { |
991 | struct dell_smm_data *data = dev_get_drvdata(dev); |
992 | struct device *dell_smm_hwmon_dev; |
993 | int state, err; |
994 | u8 i; |
995 | |
996 | for (i = 0; i < DELL_SMM_NO_TEMP; i++) { |
997 | data->temp_type[i] = i8k_get_temp_type(sensor: i); |
998 | if (data->temp_type[i] < 0) |
999 | continue; |
1000 | |
1001 | if (data->temp_type[i] >= ARRAY_SIZE(temp_labels)) |
1002 | data->temp_type[i] = ARRAY_SIZE(temp_labels) - 1; |
1003 | } |
1004 | |
1005 | for (i = 0; i < DELL_SMM_NO_FANS; i++) { |
1006 | data->fan_type[i] = INT_MIN; |
1007 | err = i8k_get_fan_status(data, fan: i); |
1008 | if (err < 0) |
1009 | err = i8k_get_fan_type(data, fan: i); |
1010 | |
1011 | if (err < 0) |
1012 | continue; |
1013 | |
1014 | data->fan[i] = true; |
1015 | |
1016 | /* the cooling device is not critical, ignore failures */ |
1017 | if (IS_REACHABLE(CONFIG_THERMAL)) { |
1018 | err = dell_smm_init_cdev(dev, fan_num: i); |
1019 | if (err < 0) |
1020 | dev_warn(dev, "Failed to register cooling device for fan %u\n" , |
1021 | i + 1); |
1022 | } |
1023 | |
1024 | data->fan_nominal_speed[i] = devm_kmalloc_array(dev, n: data->i8k_fan_max + 1, |
1025 | size: sizeof(*data->fan_nominal_speed[i]), |
1026 | GFP_KERNEL); |
1027 | if (!data->fan_nominal_speed[i]) |
1028 | continue; |
1029 | |
1030 | for (state = 0; state <= data->i8k_fan_max; state++) { |
1031 | err = i8k_get_fan_nominal_speed(data, fan: i, speed: state); |
1032 | if (err < 0) { |
1033 | /* Mark nominal speed table as invalid in case of error */ |
1034 | devm_kfree(dev, p: data->fan_nominal_speed[i]); |
1035 | data->fan_nominal_speed[i] = NULL; |
1036 | break; |
1037 | } |
1038 | data->fan_nominal_speed[i][state] = err; |
1039 | /* |
1040 | * Autodetect fan multiplier based on nominal rpm if multiplier |
1041 | * was not specified as module param or in DMI. If fan reports |
1042 | * rpm value too high then set multiplier to 1. |
1043 | */ |
1044 | if (!fan_mult && err > I8K_FAN_RPM_THRESHOLD) |
1045 | data->i8k_fan_mult = 1; |
1046 | } |
1047 | } |
1048 | |
1049 | dell_smm_hwmon_dev = devm_hwmon_device_register_with_info(dev, name: "dell_smm" , drvdata: data, |
1050 | info: &dell_smm_chip_info, NULL); |
1051 | |
1052 | return PTR_ERR_OR_ZERO(ptr: dell_smm_hwmon_dev); |
1053 | } |
1054 | |
1055 | struct i8k_config_data { |
1056 | uint fan_mult; |
1057 | uint fan_max; |
1058 | }; |
1059 | |
1060 | enum i8k_configs { |
1061 | DELL_LATITUDE_D520, |
1062 | DELL_PRECISION_490, |
1063 | DELL_STUDIO, |
1064 | DELL_XPS, |
1065 | }; |
1066 | |
1067 | /* |
1068 | * Only use for machines which need some special configuration |
1069 | * in order to work correctly (e.g. if autoconfig fails on this machines). |
1070 | */ |
1071 | |
1072 | static const struct i8k_config_data i8k_config_data[] __initconst = { |
1073 | [DELL_LATITUDE_D520] = { |
1074 | .fan_mult = 1, |
1075 | .fan_max = I8K_FAN_TURBO, |
1076 | }, |
1077 | [DELL_PRECISION_490] = { |
1078 | .fan_mult = 1, |
1079 | .fan_max = I8K_FAN_TURBO, |
1080 | }, |
1081 | [DELL_STUDIO] = { |
1082 | .fan_mult = 1, |
1083 | .fan_max = I8K_FAN_HIGH, |
1084 | }, |
1085 | [DELL_XPS] = { |
1086 | .fan_mult = 1, |
1087 | .fan_max = I8K_FAN_HIGH, |
1088 | }, |
1089 | }; |
1090 | |
1091 | static const struct dmi_system_id i8k_dmi_table[] __initconst = { |
1092 | { |
1093 | .ident = "Dell G5 5590" , |
1094 | .matches = { |
1095 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1096 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "G5 5590" ), |
1097 | }, |
1098 | }, |
1099 | { |
1100 | .ident = "Dell Inspiron" , |
1101 | .matches = { |
1102 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer" ), |
1103 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron" ), |
1104 | }, |
1105 | }, |
1106 | { |
1107 | .ident = "Dell Latitude" , |
1108 | .matches = { |
1109 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer" ), |
1110 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude" ), |
1111 | }, |
1112 | }, |
1113 | { |
1114 | .ident = "Dell Inspiron 2" , |
1115 | .matches = { |
1116 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1117 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron" ), |
1118 | }, |
1119 | }, |
1120 | { |
1121 | .ident = "Dell Latitude D520" , |
1122 | .matches = { |
1123 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1124 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520" ), |
1125 | }, |
1126 | .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520], |
1127 | }, |
1128 | { |
1129 | .ident = "Dell Latitude 2" , |
1130 | .matches = { |
1131 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1132 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude" ), |
1133 | }, |
1134 | }, |
1135 | { /* UK Inspiron 6400 */ |
1136 | .ident = "Dell Inspiron 3" , |
1137 | .matches = { |
1138 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1139 | DMI_MATCH(DMI_PRODUCT_NAME, "MM061" ), |
1140 | }, |
1141 | }, |
1142 | { |
1143 | .ident = "Dell Inspiron 3" , |
1144 | .matches = { |
1145 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1146 | DMI_MATCH(DMI_PRODUCT_NAME, "MP061" ), |
1147 | }, |
1148 | }, |
1149 | { |
1150 | .ident = "Dell Precision 490" , |
1151 | .matches = { |
1152 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1153 | DMI_MATCH(DMI_PRODUCT_NAME, |
1154 | "Precision WorkStation 490" ), |
1155 | }, |
1156 | .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490], |
1157 | }, |
1158 | { |
1159 | .ident = "Dell Precision" , |
1160 | .matches = { |
1161 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1162 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision" ), |
1163 | }, |
1164 | }, |
1165 | { |
1166 | .ident = "Dell Vostro" , |
1167 | .matches = { |
1168 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1169 | DMI_MATCH(DMI_PRODUCT_NAME, "Vostro" ), |
1170 | }, |
1171 | }, |
1172 | { |
1173 | .ident = "Dell Studio" , |
1174 | .matches = { |
1175 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1176 | DMI_MATCH(DMI_PRODUCT_NAME, "Studio" ), |
1177 | }, |
1178 | .driver_data = (void *)&i8k_config_data[DELL_STUDIO], |
1179 | }, |
1180 | { |
1181 | .ident = "Dell XPS M140" , |
1182 | .matches = { |
1183 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1184 | DMI_MATCH(DMI_PRODUCT_NAME, "MXC051" ), |
1185 | }, |
1186 | .driver_data = (void *)&i8k_config_data[DELL_XPS], |
1187 | }, |
1188 | { |
1189 | .ident = "Dell XPS" , |
1190 | .matches = { |
1191 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1192 | DMI_MATCH(DMI_PRODUCT_NAME, "XPS" ), |
1193 | }, |
1194 | }, |
1195 | { } |
1196 | }; |
1197 | |
1198 | MODULE_DEVICE_TABLE(dmi, i8k_dmi_table); |
1199 | |
1200 | /* |
1201 | * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed |
1202 | * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist |
1203 | * of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call. |
1204 | * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121 |
1205 | */ |
1206 | static const struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initconst = { |
1207 | { |
1208 | .ident = "Dell Studio XPS 8000" , |
1209 | .matches = { |
1210 | DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1211 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000" ), |
1212 | }, |
1213 | }, |
1214 | { |
1215 | .ident = "Dell Studio XPS 8100" , |
1216 | .matches = { |
1217 | DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1218 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100" ), |
1219 | }, |
1220 | }, |
1221 | { |
1222 | .ident = "Dell Inspiron 580" , |
1223 | .matches = { |
1224 | DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1225 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 " ), |
1226 | }, |
1227 | }, |
1228 | { |
1229 | .ident = "Dell Inspiron 3505" , |
1230 | .matches = { |
1231 | DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1232 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 3505" ), |
1233 | }, |
1234 | }, |
1235 | { } |
1236 | }; |
1237 | |
1238 | /* |
1239 | * On some machines all fan related SMM functions implemented by Dell BIOS |
1240 | * firmware freeze kernel for about 500ms. Until Dell fixes these problems fan |
1241 | * support for affected blacklisted Dell machines stay disabled. |
1242 | * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=195751 |
1243 | */ |
1244 | static const struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initconst = { |
1245 | { |
1246 | .ident = "Dell Inspiron 7720" , |
1247 | .matches = { |
1248 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1249 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720" ), |
1250 | }, |
1251 | }, |
1252 | { |
1253 | .ident = "Dell Vostro 3360" , |
1254 | .matches = { |
1255 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1256 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Vostro 3360" ), |
1257 | }, |
1258 | }, |
1259 | { |
1260 | .ident = "Dell XPS13 9333" , |
1261 | .matches = { |
1262 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1263 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS13 9333" ), |
1264 | }, |
1265 | }, |
1266 | { |
1267 | .ident = "Dell XPS 15 L502X" , |
1268 | .matches = { |
1269 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1270 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L502X" ), |
1271 | }, |
1272 | }, |
1273 | { } |
1274 | }; |
1275 | |
1276 | struct i8k_fan_control_data { |
1277 | unsigned int manual_fan; |
1278 | unsigned int auto_fan; |
1279 | }; |
1280 | |
1281 | enum i8k_fan_controls { |
1282 | I8K_FAN_34A3_35A3, |
1283 | }; |
1284 | |
1285 | static const struct i8k_fan_control_data i8k_fan_control_data[] __initconst = { |
1286 | [I8K_FAN_34A3_35A3] = { |
1287 | .manual_fan = 0x34a3, |
1288 | .auto_fan = 0x35a3, |
1289 | }, |
1290 | }; |
1291 | |
1292 | static const struct dmi_system_id i8k_whitelist_fan_control[] __initconst = { |
1293 | { |
1294 | .ident = "Dell Latitude 5480" , |
1295 | .matches = { |
1296 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1297 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude 5480" ), |
1298 | }, |
1299 | .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], |
1300 | }, |
1301 | { |
1302 | .ident = "Dell Latitude E6440" , |
1303 | .matches = { |
1304 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1305 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude E6440" ), |
1306 | }, |
1307 | .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], |
1308 | }, |
1309 | { |
1310 | .ident = "Dell Latitude E7440" , |
1311 | .matches = { |
1312 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1313 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude E7440" ), |
1314 | }, |
1315 | .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], |
1316 | }, |
1317 | { |
1318 | .ident = "Dell Precision 5530" , |
1319 | .matches = { |
1320 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1321 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 5530" ), |
1322 | }, |
1323 | .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], |
1324 | }, |
1325 | { |
1326 | .ident = "Dell Precision 7510" , |
1327 | .matches = { |
1328 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1329 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 7510" ), |
1330 | }, |
1331 | .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], |
1332 | }, |
1333 | { |
1334 | .ident = "Dell XPS 13 7390" , |
1335 | .matches = { |
1336 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
1337 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS 13 7390" ), |
1338 | }, |
1339 | .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], |
1340 | }, |
1341 | { } |
1342 | }; |
1343 | |
1344 | static int __init dell_smm_probe(struct platform_device *pdev) |
1345 | { |
1346 | struct dell_smm_data *data; |
1347 | const struct dmi_system_id *id, *fan_control; |
1348 | int ret; |
1349 | |
1350 | data = devm_kzalloc(dev: &pdev->dev, size: sizeof(struct dell_smm_data), GFP_KERNEL); |
1351 | if (!data) |
1352 | return -ENOMEM; |
1353 | |
1354 | mutex_init(&data->i8k_mutex); |
1355 | platform_set_drvdata(pdev, data); |
1356 | |
1357 | if (dmi_check_system(list: i8k_blacklist_fan_support_dmi_table)) { |
1358 | if (!force) { |
1359 | dev_notice(&pdev->dev, "Disabling fan support due to BIOS bugs\n" ); |
1360 | data->disallow_fan_support = true; |
1361 | } else { |
1362 | dev_warn(&pdev->dev, "Enabling fan support despite BIOS bugs\n" ); |
1363 | } |
1364 | } |
1365 | |
1366 | if (dmi_check_system(list: i8k_blacklist_fan_type_dmi_table)) { |
1367 | if (!force) { |
1368 | dev_notice(&pdev->dev, "Disabling fan type call due to BIOS bugs\n" ); |
1369 | data->disallow_fan_type_call = true; |
1370 | } else { |
1371 | dev_warn(&pdev->dev, "Enabling fan type call despite BIOS bugs\n" ); |
1372 | } |
1373 | } |
1374 | |
1375 | strscpy(p: data->bios_version, q: i8k_get_dmi_data(field: DMI_BIOS_VERSION), |
1376 | size: sizeof(data->bios_version)); |
1377 | strscpy(p: data->bios_machineid, q: i8k_get_dmi_data(field: DMI_PRODUCT_SERIAL), |
1378 | size: sizeof(data->bios_machineid)); |
1379 | |
1380 | /* |
1381 | * Set fan multiplier and maximal fan speed from dmi config |
1382 | * Values specified in module parameters override values from dmi |
1383 | */ |
1384 | id = dmi_first_match(list: i8k_dmi_table); |
1385 | if (id && id->driver_data) { |
1386 | const struct i8k_config_data *conf = id->driver_data; |
1387 | |
1388 | if (!fan_mult && conf->fan_mult) |
1389 | fan_mult = conf->fan_mult; |
1390 | |
1391 | if (!fan_max && conf->fan_max) |
1392 | fan_max = conf->fan_max; |
1393 | } |
1394 | |
1395 | /* All options must not be 0 */ |
1396 | data->i8k_fan_mult = fan_mult ? : I8K_FAN_MULT; |
1397 | data->i8k_fan_max = fan_max ? : I8K_FAN_HIGH; |
1398 | data->i8k_pwm_mult = DIV_ROUND_UP(255, data->i8k_fan_max); |
1399 | |
1400 | fan_control = dmi_first_match(list: i8k_whitelist_fan_control); |
1401 | if (fan_control && fan_control->driver_data) { |
1402 | const struct i8k_fan_control_data *control = fan_control->driver_data; |
1403 | |
1404 | data->manual_fan = control->manual_fan; |
1405 | data->auto_fan = control->auto_fan; |
1406 | dev_info(&pdev->dev, "enabling support for setting automatic/manual fan control\n" ); |
1407 | } |
1408 | |
1409 | ret = dell_smm_init_hwmon(dev: &pdev->dev); |
1410 | if (ret) |
1411 | return ret; |
1412 | |
1413 | i8k_init_procfs(dev: &pdev->dev); |
1414 | |
1415 | return 0; |
1416 | } |
1417 | |
1418 | static struct platform_driver dell_smm_driver = { |
1419 | .driver = { |
1420 | .name = KBUILD_MODNAME, |
1421 | }, |
1422 | }; |
1423 | |
1424 | static struct platform_device *dell_smm_device; |
1425 | |
1426 | /* |
1427 | * Probe for the presence of a supported laptop. |
1428 | */ |
1429 | static int __init i8k_init(void) |
1430 | { |
1431 | /* |
1432 | * Get DMI information |
1433 | */ |
1434 | if (!dmi_check_system(list: i8k_dmi_table)) { |
1435 | if (!ignore_dmi && !force) |
1436 | return -ENODEV; |
1437 | |
1438 | pr_info("not running on a supported Dell system.\n" ); |
1439 | pr_info("vendor=%s, model=%s, version=%s\n" , |
1440 | i8k_get_dmi_data(DMI_SYS_VENDOR), |
1441 | i8k_get_dmi_data(DMI_PRODUCT_NAME), |
1442 | i8k_get_dmi_data(DMI_BIOS_VERSION)); |
1443 | } |
1444 | |
1445 | /* |
1446 | * Get SMM Dell signature |
1447 | */ |
1448 | if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) && |
1449 | i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) { |
1450 | if (!force) |
1451 | return -ENODEV; |
1452 | |
1453 | pr_err("Unable to get Dell SMM signature\n" ); |
1454 | } |
1455 | |
1456 | dell_smm_device = platform_create_bundle(&dell_smm_driver, dell_smm_probe, NULL, 0, NULL, |
1457 | 0); |
1458 | |
1459 | return PTR_ERR_OR_ZERO(ptr: dell_smm_device); |
1460 | } |
1461 | |
1462 | static void __exit i8k_exit(void) |
1463 | { |
1464 | platform_device_unregister(dell_smm_device); |
1465 | platform_driver_unregister(&dell_smm_driver); |
1466 | } |
1467 | |
1468 | module_init(i8k_init); |
1469 | module_exit(i8k_exit); |
1470 | |