1 // SPDX-License-Identifier: GPL-2.0+
2
3 /* Platform driver for GPD devices that expose fan control via hwmon sysfs.
4 *
5 * Fan control is provided via pwm interface in the range [0-255].
6 * Each model has a different range in the EC, the written value is scaled to
7 * accommodate for that.
8 *
9 * Based on this repo:
10 * https://github.com/Cryolitia/gpd-fan-driver
11 *
12 * Copyright (c) 2024 Cryolitia PukNgae
13 */
14
15 #include <linux/dmi.h>
16 #include <linux/hwmon.h>
17 #include <linux/io.h>
18 #include <linux/ioport.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/platform_device.h>
22
23 #define DRIVER_NAME "gpdfan"
24 #define GPD_PWM_CTR_OFFSET 0x1841
25
26 static char *gpd_fan_board = "";
27 module_param(gpd_fan_board, charp, 0444);
28
29 enum gpd_board {
30 win_mini,
31 win4_6800u,
32 win_max_2,
33 duo,
34 mpc2,
35 };
36
37 enum FAN_PWM_ENABLE {
38 DISABLE = 0,
39 MANUAL = 1,
40 AUTOMATIC = 2,
41 };
42
43 static struct {
44 enum FAN_PWM_ENABLE pwm_enable;
45 u8 pwm_value;
46
47 const struct gpd_fan_drvdata *drvdata;
48 } gpd_driver_priv;
49
50 struct gpd_fan_drvdata {
51 const char *board_name; // Board name for module param comparison
52 const enum gpd_board board;
53
54 const u8 addr_port;
55 const u8 data_port;
56 const u16 manual_control_enable;
57 const u16 rpm_read;
58 const u16 pwm_write;
59 const u16 pwm_max;
60 };
61
62 static struct gpd_fan_drvdata gpd_win_mini_drvdata = {
63 .board_name = "win_mini",
64 .board = win_mini,
65
66 .addr_port = 0x4E,
67 .data_port = 0x4F,
68 .manual_control_enable = 0x047A,
69 .rpm_read = 0x0478,
70 .pwm_write = 0x047A,
71 .pwm_max = 244,
72 };
73
74 static struct gpd_fan_drvdata gpd_duo_drvdata = {
75 .board_name = "duo",
76 .board = duo,
77
78 .addr_port = 0x4E,
79 .data_port = 0x4F,
80 .manual_control_enable = 0x047A,
81 .rpm_read = 0x0478,
82 .pwm_write = 0x047A,
83 .pwm_max = 244,
84 };
85
86 static struct gpd_fan_drvdata gpd_win4_drvdata = {
87 .board_name = "win4",
88 .board = win4_6800u,
89
90 .addr_port = 0x2E,
91 .data_port = 0x2F,
92 .manual_control_enable = 0xC311,
93 .rpm_read = 0xC880,
94 .pwm_write = 0xC311,
95 .pwm_max = 127,
96 };
97
98 static struct gpd_fan_drvdata gpd_wm2_drvdata = {
99 .board_name = "wm2",
100 .board = win_max_2,
101
102 .addr_port = 0x4E,
103 .data_port = 0x4F,
104 .manual_control_enable = 0x0275,
105 .rpm_read = 0x0218,
106 .pwm_write = 0x1809,
107 .pwm_max = 184,
108 };
109
110 static struct gpd_fan_drvdata gpd_mpc2_drvdata = {
111 .board_name = "mpc2",
112 .board = mpc2,
113
114 .addr_port = 0x4E,
115 .data_port = 0x4F,
116 .manual_control_enable = 0x047A,
117 .rpm_read = 0x0476,
118 .pwm_write = 0x047A,
119 .pwm_max = 244,
120 };
121
122 static const struct dmi_system_id dmi_table[] = {
123 {
124 // GPD Win Mini
125 // GPD Win Mini with AMD Ryzen 8840U
126 .matches = {
127 DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
128 DMI_MATCH(DMI_PRODUCT_NAME, "G1617-01")
129 },
130 .driver_data = &gpd_win_mini_drvdata,
131 },
132 {
133 // GPD Win Mini
134 // GPD Win Mini with AMD Ryzen HX370
135 .matches = {
136 DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
137 DMI_MATCH(DMI_PRODUCT_NAME, "G1617-02")
138 },
139 .driver_data = &gpd_win_mini_drvdata,
140 },
141 {
142 // GPD Win Mini
143 // GPD Win Mini with AMD Ryzen HX370
144 .matches = {
145 DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
146 DMI_MATCH(DMI_PRODUCT_NAME, "G1617-02-L")
147 },
148 .driver_data = &gpd_win_mini_drvdata,
149 },
150 {
151 // GPD Win 4 with AMD Ryzen 6800U
152 .matches = {
153 DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
154 DMI_MATCH(DMI_PRODUCT_NAME, "G1618-04"),
155 DMI_MATCH(DMI_BOARD_VERSION, "Default string"),
156 },
157 .driver_data = &gpd_win4_drvdata,
158 },
159 {
160 // GPD Win 4 with Ryzen 7840U
161 .matches = {
162 DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
163 DMI_MATCH(DMI_PRODUCT_NAME, "G1618-04"),
164 DMI_MATCH(DMI_BOARD_VERSION, "Ver. 1.0"),
165 },
166 // Since 7840U, win4 uses the same drvdata as wm2
167 .driver_data = &gpd_wm2_drvdata,
168 },
169 {
170 // GPD Win 4 with Ryzen 7840U (another)
171 .matches = {
172 DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
173 DMI_MATCH(DMI_PRODUCT_NAME, "G1618-04"),
174 DMI_MATCH(DMI_BOARD_VERSION, "Ver.1.0"),
175 },
176 .driver_data = &gpd_wm2_drvdata,
177 },
178 {
179 // GPD Win Max 2 with Ryzen 6800U
180 // GPD Win Max 2 2023 with Ryzen 7840U
181 // GPD Win Max 2 2024 with Ryzen 8840U
182 .matches = {
183 DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
184 DMI_MATCH(DMI_PRODUCT_NAME, "G1619-04"),
185 },
186 .driver_data = &gpd_wm2_drvdata,
187 },
188 {
189 // GPD Win Max 2 with AMD Ryzen HX370
190 .matches = {
191 DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
192 DMI_MATCH(DMI_PRODUCT_NAME, "G1619-05"),
193 },
194 .driver_data = &gpd_wm2_drvdata,
195 },
196 {
197 // GPD Duo
198 .matches = {
199 DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
200 DMI_MATCH(DMI_PRODUCT_NAME, "G1622-01"),
201 },
202 .driver_data = &gpd_duo_drvdata,
203 },
204 {
205 // GPD Duo (another)
206 .matches = {
207 DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
208 DMI_MATCH(DMI_PRODUCT_NAME, "G1622-01-L"),
209 },
210 .driver_data = &gpd_duo_drvdata,
211 },
212 {
213 // GPD Win 5 with AMD AI MAX 395
214 .matches = {
215 DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
216 DMI_MATCH(DMI_PRODUCT_NAME, "G1618-05"),
217 },
218 .driver_data = &gpd_duo_drvdata,
219 },
220 {
221 // GPD Pocket 4
222 .matches = {
223 DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
224 DMI_MATCH(DMI_PRODUCT_NAME, "G1628-04"),
225 },
226 .driver_data = &gpd_win_mini_drvdata,
227 },
228 {
229 // GPD Pocket 4 (another)
230 .matches = {
231 DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
232 DMI_MATCH(DMI_PRODUCT_NAME, "G1628-04-L"),
233 },
234 .driver_data = &gpd_win_mini_drvdata,
235 },
236 {
237 // GPD Micro PC 2
238 .matches = {
239 DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
240 DMI_MATCH(DMI_PRODUCT_NAME, "G1688-08"),
241 },
242 .driver_data = &gpd_mpc2_drvdata,
243 },
244 {}
245 };
246
247 static const struct gpd_fan_drvdata *gpd_module_drvdata[] = {
248 &gpd_win_mini_drvdata, &gpd_win4_drvdata, &gpd_wm2_drvdata, &gpd_mpc2_drvdata, NULL
249 };
250
251 // Helper functions to handle EC read/write
gpd_ecram_read(u16 offset,u8 * val)252 static void gpd_ecram_read(u16 offset, u8 *val)
253 {
254 u16 addr_port = gpd_driver_priv.drvdata->addr_port;
255 u16 data_port = gpd_driver_priv.drvdata->data_port;
256
257 outb(0x2E, addr_port);
258 outb(0x11, data_port);
259 outb(0x2F, addr_port);
260 outb((u8)((offset >> 8) & 0xFF), data_port);
261
262 outb(0x2E, addr_port);
263 outb(0x10, data_port);
264 outb(0x2F, addr_port);
265 outb((u8)(offset & 0xFF), data_port);
266
267 outb(0x2E, addr_port);
268 outb(0x12, data_port);
269 outb(0x2F, addr_port);
270 *val = inb(data_port);
271 }
272
gpd_ecram_write(u16 offset,u8 value)273 static void gpd_ecram_write(u16 offset, u8 value)
274 {
275 u16 addr_port = gpd_driver_priv.drvdata->addr_port;
276 u16 data_port = gpd_driver_priv.drvdata->data_port;
277
278 outb(0x2E, addr_port);
279 outb(0x11, data_port);
280 outb(0x2F, addr_port);
281 outb((u8)((offset >> 8) & 0xFF), data_port);
282
283 outb(0x2E, addr_port);
284 outb(0x10, data_port);
285 outb(0x2F, addr_port);
286 outb((u8)(offset & 0xFF), data_port);
287
288 outb(0x2E, addr_port);
289 outb(0x12, data_port);
290 outb(0x2F, addr_port);
291 outb(value, data_port);
292 }
293
gpd_generic_read_rpm(void)294 static int gpd_generic_read_rpm(void)
295 {
296 const struct gpd_fan_drvdata *const drvdata = gpd_driver_priv.drvdata;
297 u8 high, low;
298
299 gpd_ecram_read(drvdata->rpm_read, &high);
300 gpd_ecram_read(drvdata->rpm_read + 1, &low);
301
302 return (u16)high << 8 | low;
303 }
304
gpd_wm2_read_rpm(void)305 static int gpd_wm2_read_rpm(void)
306 {
307 for (u16 pwm_ctr_offset = GPD_PWM_CTR_OFFSET;
308 pwm_ctr_offset <= GPD_PWM_CTR_OFFSET + 2; pwm_ctr_offset++) {
309 u8 PWMCTR;
310
311 gpd_ecram_read(pwm_ctr_offset, &PWMCTR);
312
313 if (PWMCTR != 0xB8)
314 gpd_ecram_write(pwm_ctr_offset, 0xB8);
315 }
316
317 return gpd_generic_read_rpm();
318 }
319
320 // Read value for fan1_input
gpd_read_rpm(void)321 static int gpd_read_rpm(void)
322 {
323 switch (gpd_driver_priv.drvdata->board) {
324 case win4_6800u:
325 case win_mini:
326 case duo:
327 case mpc2:
328 return gpd_generic_read_rpm();
329 case win_max_2:
330 return gpd_wm2_read_rpm();
331 }
332
333 return 0;
334 }
335
gpd_wm2_read_pwm(void)336 static int gpd_wm2_read_pwm(void)
337 {
338 const struct gpd_fan_drvdata *const drvdata = gpd_driver_priv.drvdata;
339 u8 var;
340
341 gpd_ecram_read(drvdata->pwm_write, &var);
342
343 // Match gpd_generic_write_pwm(u8) below
344 return DIV_ROUND_CLOSEST((var - 1) * 255, (drvdata->pwm_max - 1));
345 }
346
347 // Read value for pwm1
gpd_read_pwm(void)348 static int gpd_read_pwm(void)
349 {
350 switch (gpd_driver_priv.drvdata->board) {
351 case win_mini:
352 case duo:
353 case win4_6800u:
354 case mpc2:
355 switch (gpd_driver_priv.pwm_enable) {
356 case DISABLE:
357 return 255;
358 case MANUAL:
359 return gpd_driver_priv.pwm_value;
360 case AUTOMATIC:
361 return -EOPNOTSUPP;
362 }
363 break;
364 case win_max_2:
365 return gpd_wm2_read_pwm();
366 }
367 return 0;
368 }
369
370 // PWM value's range in EC is 1 - pwm_max, cast 0 - 255 to it.
gpd_cast_pwm_range(u8 val)371 static inline u8 gpd_cast_pwm_range(u8 val)
372 {
373 const struct gpd_fan_drvdata *const drvdata = gpd_driver_priv.drvdata;
374
375 return DIV_ROUND_CLOSEST(val * (drvdata->pwm_max - 1), 255) + 1;
376 }
377
gpd_generic_write_pwm(u8 val)378 static void gpd_generic_write_pwm(u8 val)
379 {
380 const struct gpd_fan_drvdata *const drvdata = gpd_driver_priv.drvdata;
381 u8 pwm_reg;
382
383 pwm_reg = gpd_cast_pwm_range(val);
384 gpd_ecram_write(drvdata->pwm_write, pwm_reg);
385 }
386
gpd_duo_write_pwm(u8 val)387 static void gpd_duo_write_pwm(u8 val)
388 {
389 const struct gpd_fan_drvdata *const drvdata = gpd_driver_priv.drvdata;
390 u8 pwm_reg;
391
392 pwm_reg = gpd_cast_pwm_range(val);
393 gpd_ecram_write(drvdata->pwm_write, pwm_reg);
394 gpd_ecram_write(drvdata->pwm_write + 1, pwm_reg);
395 }
396
397 // Write value for pwm1
gpd_write_pwm(u8 val)398 static int gpd_write_pwm(u8 val)
399 {
400 if (gpd_driver_priv.pwm_enable != MANUAL)
401 return -EPERM;
402
403 switch (gpd_driver_priv.drvdata->board) {
404 case duo:
405 gpd_duo_write_pwm(val);
406 break;
407 case win_mini:
408 case win4_6800u:
409 case win_max_2:
410 case mpc2:
411 gpd_generic_write_pwm(val);
412 break;
413 }
414
415 return 0;
416 }
417
gpd_win_mini_set_pwm_enable(enum FAN_PWM_ENABLE pwm_enable)418 static void gpd_win_mini_set_pwm_enable(enum FAN_PWM_ENABLE pwm_enable)
419 {
420 switch (pwm_enable) {
421 case DISABLE:
422 gpd_generic_write_pwm(255);
423 break;
424 case MANUAL:
425 gpd_generic_write_pwm(gpd_driver_priv.pwm_value);
426 break;
427 case AUTOMATIC:
428 gpd_ecram_write(gpd_driver_priv.drvdata->pwm_write, 0);
429 break;
430 }
431 }
432
gpd_duo_set_pwm_enable(enum FAN_PWM_ENABLE pwm_enable)433 static void gpd_duo_set_pwm_enable(enum FAN_PWM_ENABLE pwm_enable)
434 {
435 switch (pwm_enable) {
436 case DISABLE:
437 gpd_duo_write_pwm(255);
438 break;
439 case MANUAL:
440 gpd_duo_write_pwm(gpd_driver_priv.pwm_value);
441 break;
442 case AUTOMATIC:
443 gpd_ecram_write(gpd_driver_priv.drvdata->pwm_write, 0);
444 break;
445 }
446 }
447
gpd_wm2_set_pwm_enable(enum FAN_PWM_ENABLE enable)448 static void gpd_wm2_set_pwm_enable(enum FAN_PWM_ENABLE enable)
449 {
450 const struct gpd_fan_drvdata *const drvdata = gpd_driver_priv.drvdata;
451
452 switch (enable) {
453 case DISABLE:
454 gpd_generic_write_pwm(255);
455 gpd_ecram_write(drvdata->manual_control_enable, 1);
456 break;
457 case MANUAL:
458 gpd_generic_write_pwm(gpd_driver_priv.pwm_value);
459 gpd_ecram_write(drvdata->manual_control_enable, 1);
460 break;
461 case AUTOMATIC:
462 gpd_ecram_write(drvdata->manual_control_enable, 0);
463 break;
464 }
465 }
466
467 // Write value for pwm1_enable
gpd_set_pwm_enable(enum FAN_PWM_ENABLE enable)468 static void gpd_set_pwm_enable(enum FAN_PWM_ENABLE enable)
469 {
470 if (enable == MANUAL)
471 // Set pwm_value to max firstly when switching to manual mode, in
472 // consideration of device safety.
473 gpd_driver_priv.pwm_value = 255;
474
475 switch (gpd_driver_priv.drvdata->board) {
476 case win_mini:
477 case win4_6800u:
478 case mpc2:
479 gpd_win_mini_set_pwm_enable(enable);
480 break;
481 case duo:
482 gpd_duo_set_pwm_enable(enable);
483 break;
484 case win_max_2:
485 gpd_wm2_set_pwm_enable(enable);
486 break;
487 }
488 }
489
gpd_fan_hwmon_is_visible(__always_unused const void * drvdata,enum hwmon_sensor_types type,u32 attr,__always_unused int channel)490 static umode_t gpd_fan_hwmon_is_visible(__always_unused const void *drvdata,
491 enum hwmon_sensor_types type, u32 attr,
492 __always_unused int channel)
493 {
494 if (type == hwmon_fan && attr == hwmon_fan_input) {
495 return 0444;
496 } else if (type == hwmon_pwm) {
497 switch (attr) {
498 case hwmon_pwm_enable:
499 case hwmon_pwm_input:
500 return 0644;
501 default:
502 return 0;
503 }
504 }
505 return 0;
506 }
507
gpd_fan_hwmon_read(__always_unused struct device * dev,enum hwmon_sensor_types type,u32 attr,__always_unused int channel,long * val)508 static int gpd_fan_hwmon_read(__always_unused struct device *dev,
509 enum hwmon_sensor_types type, u32 attr,
510 __always_unused int channel, long *val)
511 {
512 int ret;
513
514 if (type == hwmon_fan) {
515 if (attr == hwmon_fan_input) {
516 ret = gpd_read_rpm();
517
518 if (ret < 0)
519 return ret;
520
521 *val = ret;
522 return 0;
523 }
524 } else if (type == hwmon_pwm) {
525 switch (attr) {
526 case hwmon_pwm_enable:
527 *val = gpd_driver_priv.pwm_enable;
528 return 0;
529 case hwmon_pwm_input:
530 ret = gpd_read_pwm();
531
532 if (ret < 0)
533 return ret;
534
535 *val = ret;
536 return 0;
537 }
538 }
539
540 return -EOPNOTSUPP;
541 }
542
gpd_fan_hwmon_write(__always_unused struct device * dev,enum hwmon_sensor_types type,u32 attr,__always_unused int channel,long val)543 static int gpd_fan_hwmon_write(__always_unused struct device *dev,
544 enum hwmon_sensor_types type, u32 attr,
545 __always_unused int channel, long val)
546 {
547 if (type == hwmon_pwm) {
548 switch (attr) {
549 case hwmon_pwm_enable:
550 if (!in_range(val, 0, 3))
551 return -EINVAL;
552
553 gpd_driver_priv.pwm_enable = val;
554
555 gpd_set_pwm_enable(gpd_driver_priv.pwm_enable);
556 return 0;
557 case hwmon_pwm_input:
558 if (!in_range(val, 0, 256))
559 return -EINVAL;
560
561 gpd_driver_priv.pwm_value = val;
562
563 return gpd_write_pwm(val);
564 }
565 }
566
567 return -EOPNOTSUPP;
568 }
569
570 static const struct hwmon_ops gpd_fan_ops = {
571 .is_visible = gpd_fan_hwmon_is_visible,
572 .read = gpd_fan_hwmon_read,
573 .write = gpd_fan_hwmon_write,
574 };
575
576 static const struct hwmon_channel_info *gpd_fan_hwmon_channel_info[] = {
577 HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT),
578 HWMON_CHANNEL_INFO(pwm, HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
579 NULL
580 };
581
582 static struct hwmon_chip_info gpd_fan_chip_info = {
583 .ops = &gpd_fan_ops,
584 .info = gpd_fan_hwmon_channel_info
585 };
586
gpd_win4_init_ec(void)587 static void gpd_win4_init_ec(void)
588 {
589 u8 chip_id, chip_ver;
590
591 gpd_ecram_read(0x2000, &chip_id);
592
593 if (chip_id == 0x55) {
594 gpd_ecram_read(0x1060, &chip_ver);
595 gpd_ecram_write(0x1060, chip_ver | 0x80);
596 }
597 }
598
gpd_init_ec(void)599 static void gpd_init_ec(void)
600 {
601 // The buggy firmware won't initialize EC properly on boot.
602 // Before its initialization, reading RPM will always return 0,
603 // and writing PWM will have no effect.
604 // Initialize it manually on driver load.
605 if (gpd_driver_priv.drvdata->board == win4_6800u)
606 gpd_win4_init_ec();
607 }
608
gpd_fan_probe(struct platform_device * pdev)609 static int gpd_fan_probe(struct platform_device *pdev)
610 {
611 struct device *dev = &pdev->dev;
612 const struct resource *region;
613 const struct resource *res;
614 const struct device *hwdev;
615
616 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
617 if (!res)
618 return dev_err_probe(dev, -EINVAL,
619 "Failed to get platform resource\n");
620
621 region = devm_request_region(dev, res->start,
622 resource_size(res), DRIVER_NAME);
623 if (!region)
624 return dev_err_probe(dev, -EBUSY,
625 "Failed to request region\n");
626
627 hwdev = devm_hwmon_device_register_with_info(dev,
628 DRIVER_NAME,
629 NULL,
630 &gpd_fan_chip_info,
631 NULL);
632 if (IS_ERR(hwdev))
633 return dev_err_probe(dev, PTR_ERR(hwdev),
634 "Failed to register hwmon device\n");
635
636 gpd_init_ec();
637
638 return 0;
639 }
640
gpd_fan_remove(__always_unused struct platform_device * pdev)641 static void gpd_fan_remove(__always_unused struct platform_device *pdev)
642 {
643 gpd_driver_priv.pwm_enable = AUTOMATIC;
644 gpd_set_pwm_enable(AUTOMATIC);
645 }
646
647 static struct platform_driver gpd_fan_driver = {
648 .probe = gpd_fan_probe,
649 .remove = gpd_fan_remove,
650 .driver = {
651 .name = KBUILD_MODNAME,
652 },
653 };
654
655 static struct platform_device *gpd_fan_platform_device;
656
gpd_fan_init(void)657 static int __init gpd_fan_init(void)
658 {
659 const struct gpd_fan_drvdata *match = NULL;
660
661 for (const struct gpd_fan_drvdata **p = gpd_module_drvdata; *p; p++) {
662 if (strcmp(gpd_fan_board, (*p)->board_name) == 0) {
663 match = *p;
664 break;
665 }
666 }
667
668 if (!match) {
669 const struct dmi_system_id *dmi_match =
670 dmi_first_match(dmi_table);
671 if (dmi_match)
672 match = dmi_match->driver_data;
673 }
674
675 if (!match)
676 return -ENODEV;
677
678 gpd_driver_priv.pwm_enable = AUTOMATIC;
679 gpd_driver_priv.pwm_value = 255;
680 gpd_driver_priv.drvdata = match;
681
682 struct resource gpd_fan_resources[] = {
683 {
684 .start = match->addr_port,
685 .end = match->data_port,
686 .flags = IORESOURCE_IO,
687 },
688 };
689
690 gpd_fan_platform_device = platform_create_bundle(&gpd_fan_driver,
691 gpd_fan_probe,
692 gpd_fan_resources,
693 1, NULL, 0);
694
695 if (IS_ERR(gpd_fan_platform_device)) {
696 pr_warn("Failed to create platform device\n");
697 return PTR_ERR(gpd_fan_platform_device);
698 }
699
700 return 0;
701 }
702
gpd_fan_exit(void)703 static void __exit gpd_fan_exit(void)
704 {
705 platform_device_unregister(gpd_fan_platform_device);
706 platform_driver_unregister(&gpd_fan_driver);
707 }
708
709 MODULE_DEVICE_TABLE(dmi, dmi_table);
710
711 module_init(gpd_fan_init);
712 module_exit(gpd_fan_exit);
713
714 MODULE_LICENSE("GPL");
715 MODULE_AUTHOR("Cryolitia PukNgae <cryolitia@uniontech.com>");
716 MODULE_DESCRIPTION("GPD Devices fan control driver");
717