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594fbe71 AE |
1 | /* |
2 | * g762 - Driver for the Global Mixed-mode Technology Inc. fan speed | |
3 | * PWM controller chips from G762 family, i.e. G762 and G763 | |
4 | * | |
5 | * Copyright (C) 2013, Arnaud EBALARD <arno@natisbad.org> | |
6 | * | |
7 | * This work is based on a basic version for 2.6.31 kernel developed | |
8 | * by Olivier Mouchet for LaCie. Updates and correction have been | |
9 | * performed to run on recent kernels. Additional features, like the | |
10 | * ability to configure various characteristics via .dts file or | |
11 | * board init file have been added. Detailed datasheet on which this | |
12 | * development is based is available here: | |
13 | * | |
14 | * http://natisbad.org/NAS/refs/GMT_EDS-762_763-080710-0.2.pdf | |
15 | * | |
16 | * Headers from previous developments have been kept below: | |
17 | * | |
18 | * Copyright (c) 2009 LaCie | |
19 | * | |
20 | * Author: Olivier Mouchet <olivier.mouchet@gmail.com> | |
21 | * | |
22 | * based on g760a code written by Herbert Valerio Riedel <hvr@gnu.org> | |
23 | * Copyright (C) 2007 Herbert Valerio Riedel <hvr@gnu.org> | |
24 | * | |
25 | * g762: minimal datasheet available at: | |
26 | * http://www.gmt.com.tw/product/datasheet/EDS-762_3.pdf | |
27 | * | |
28 | * This program is free software; you can redistribute it and/or modify | |
29 | * it under the terms of the GNU General Public License as published by | |
30 | * the Free Software Foundation; either version 2 of the License, or | |
31 | * (at your option) any later version. | |
32 | * | |
33 | * This program is distributed in the hope that it will be useful, | |
34 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
35 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
36 | * GNU General Public License for more details. | |
37 | * | |
38 | * You should have received a copy of the GNU General Public License | |
39 | * along with this program; if not, write to the Free Software | |
40 | * Foundation. | |
41 | */ | |
42 | ||
43 | #include <linux/device.h> | |
44 | #include <linux/module.h> | |
45 | #include <linux/init.h> | |
46 | #include <linux/jiffies.h> | |
47 | #include <linux/i2c.h> | |
48 | #include <linux/hwmon.h> | |
49 | #include <linux/hwmon-sysfs.h> | |
50 | #include <linux/err.h> | |
51 | #include <linux/mutex.h> | |
52 | #include <linux/kernel.h> | |
53 | #include <linux/clk.h> | |
54 | #include <linux/of.h> | |
55 | #include <linux/of_device.h> | |
56 | #include <linux/platform_data/g762.h> | |
57 | ||
58 | #define DRVNAME "g762" | |
59 | ||
60 | static const struct i2c_device_id g762_id[] = { | |
61 | { "g762", 0 }, | |
62 | { "g763", 0 }, | |
63 | { } | |
64 | }; | |
65 | MODULE_DEVICE_TABLE(i2c, g762_id); | |
66 | ||
67 | enum g762_regs { | |
68 | G762_REG_SET_CNT = 0x00, | |
69 | G762_REG_ACT_CNT = 0x01, | |
70 | G762_REG_FAN_STA = 0x02, | |
71 | G762_REG_SET_OUT = 0x03, | |
72 | G762_REG_FAN_CMD1 = 0x04, | |
73 | G762_REG_FAN_CMD2 = 0x05, | |
74 | }; | |
75 | ||
76 | /* Config register bits */ | |
77 | #define G762_REG_FAN_CMD1_DET_FAN_FAIL 0x80 /* enable fan_fail signal */ | |
78 | #define G762_REG_FAN_CMD1_DET_FAN_OOC 0x40 /* enable fan_out_of_control */ | |
79 | #define G762_REG_FAN_CMD1_OUT_MODE 0x20 /* out mode: PWM or DC */ | |
80 | #define G762_REG_FAN_CMD1_FAN_MODE 0x10 /* fan mode: closed/open-loop */ | |
81 | #define G762_REG_FAN_CMD1_CLK_DIV_ID1 0x08 /* clock divisor value */ | |
82 | #define G762_REG_FAN_CMD1_CLK_DIV_ID0 0x04 | |
83 | #define G762_REG_FAN_CMD1_PWM_POLARITY 0x02 /* PWM polarity */ | |
84 | #define G762_REG_FAN_CMD1_PULSE_PER_REV 0x01 /* pulse per fan revolution */ | |
85 | ||
86 | #define G762_REG_FAN_CMD2_GEAR_MODE_1 0x08 /* fan gear mode */ | |
87 | #define G762_REG_FAN_CMD2_GEAR_MODE_0 0x04 | |
88 | #define G762_REG_FAN_CMD2_FAN_STARTV_1 0x02 /* fan startup voltage */ | |
89 | #define G762_REG_FAN_CMD2_FAN_STARTV_0 0x01 | |
90 | ||
91 | #define G762_REG_FAN_STA_FAIL 0x02 /* fan fail */ | |
92 | #define G762_REG_FAN_STA_OOC 0x01 /* fan out of control */ | |
93 | ||
94 | /* Config register values */ | |
95 | #define G762_OUT_MODE_PWM 1 | |
96 | #define G762_OUT_MODE_DC 0 | |
97 | ||
98 | #define G762_FAN_MODE_CLOSED_LOOP 2 | |
99 | #define G762_FAN_MODE_OPEN_LOOP 1 | |
100 | ||
101 | #define G762_PWM_POLARITY_NEGATIVE 1 | |
102 | #define G762_PWM_POLARITY_POSITIVE 0 | |
103 | ||
104 | /* Register data is read (and cached) at most once per second. */ | |
105 | #define G762_UPDATE_INTERVAL HZ | |
106 | ||
107 | /* | |
108 | * Extract pulse count per fan revolution value (2 or 4) from given | |
109 | * FAN_CMD1 register value. | |
110 | */ | |
111 | #define G762_PULSE_FROM_REG(reg) \ | |
112 | ((((reg) & G762_REG_FAN_CMD1_PULSE_PER_REV) + 1) << 1) | |
113 | ||
114 | /* | |
115 | * Extract fan clock divisor (1, 2, 4 or 8) from given FAN_CMD1 | |
116 | * register value. | |
117 | */ | |
118 | #define G762_CLKDIV_FROM_REG(reg) \ | |
119 | (1 << (((reg) & (G762_REG_FAN_CMD1_CLK_DIV_ID0 | \ | |
120 | G762_REG_FAN_CMD1_CLK_DIV_ID1)) >> 2)) | |
121 | ||
122 | /* | |
123 | * Extract fan gear mode multiplier value (0, 2 or 4) from given | |
124 | * FAN_CMD2 register value. | |
125 | */ | |
126 | #define G762_GEARMULT_FROM_REG(reg) \ | |
127 | (1 << (((reg) & (G762_REG_FAN_CMD2_GEAR_MODE_0 | \ | |
128 | G762_REG_FAN_CMD2_GEAR_MODE_1)) >> 2)) | |
129 | ||
130 | struct g762_data { | |
131 | struct i2c_client *client; | |
132 | struct device *hwmon_dev; | |
133 | struct clk *clk; | |
134 | ||
135 | /* update mutex */ | |
136 | struct mutex update_lock; | |
137 | ||
138 | /* board specific parameters. */ | |
139 | u32 clk_freq; | |
140 | ||
141 | /* g762 register cache */ | |
142 | bool valid; | |
143 | unsigned long last_updated; /* in jiffies */ | |
144 | ||
145 | u8 set_cnt; /* controls fan rotation speed in closed-loop mode */ | |
146 | u8 act_cnt; /* provides access to current fan RPM value */ | |
147 | u8 fan_sta; /* bit 0: set when actual fan speed is more than | |
148 | * 25% outside requested fan speed | |
149 | * bit 1: set when no transition occurs on fan | |
150 | * pin for 0.7s | |
151 | */ | |
152 | u8 set_out; /* controls fan rotation speed in open-loop mode */ | |
153 | u8 fan_cmd1; /* 0: FG_PLS_ID0 FG pulses count per revolution | |
154 | * 0: 2 counts per revolution | |
155 | * 1: 4 counts per revolution | |
156 | * 1: PWM_POLARITY 1: negative_duty | |
157 | * 0: positive_duty | |
158 | * 2,3: [FG_CLOCK_ID0, FG_CLK_ID1] | |
159 | * 00: Divide fan clock by 1 | |
160 | * 01: Divide fan clock by 2 | |
161 | * 10: Divide fan clock by 4 | |
162 | * 11: Divide fan clock by 8 | |
163 | * 4: FAN_MODE 1:closed-loop, 0:open-loop | |
164 | * 5: OUT_MODE 1:PWM, 0:DC | |
165 | * 6: DET_FAN_OOC enable "fan ooc" status | |
166 | * 7: DET_FAN_FAIL enable "fan fail" status | |
167 | */ | |
168 | u8 fan_cmd2; /* 0,1: FAN_STARTV 0,1,2,3 -> 0,32,64,96 dac_code | |
169 | * 2,3: FG_GEAR_MODE | |
170 | * 00: multiplier = 1 | |
171 | * 01: multiplier = 2 | |
172 | * 10: multiplier = 4 | |
173 | * 4: Mask ALERT# (g763 only) | |
174 | */ | |
175 | }; | |
176 | ||
177 | /* | |
178 | * Convert count value from fan controller register (FAN_SET_CNT) into fan | |
179 | * speed RPM value. Note that the datasheet documents a basic formula; | |
180 | * influence of additional parameters (fan clock divisor, fan gear mode) | |
181 | * have been infered from examples in the datasheet and tests. | |
182 | */ | |
183 | static inline unsigned int rpm_from_cnt(u8 cnt, u32 clk_freq, u16 p, | |
184 | u8 clk_div, u8 gear_mult) | |
185 | { | |
186 | if (cnt == 0xff) /* setting cnt to 255 stops the fan */ | |
187 | return 0; | |
188 | ||
189 | return (clk_freq * 30 * gear_mult) / ((cnt ? cnt : 1) * p * clk_div); | |
190 | } | |
191 | ||
192 | /* | |
193 | * Convert fan RPM value from sysfs into count value for fan controller | |
194 | * register (FAN_SET_CNT). | |
195 | */ | |
196 | static inline unsigned char cnt_from_rpm(u32 rpm, u32 clk_freq, u16 p, | |
197 | u8 clk_div, u8 gear_mult) | |
198 | { | |
199 | if (!rpm) /* to stop the fan, set cnt to 255 */ | |
200 | return 0xff; | |
201 | ||
202 | return clamp_val(((clk_freq * 30 * gear_mult) / (rpm * p * clk_div)), | |
203 | 0, 255); | |
204 | } | |
205 | ||
206 | /* helper to grab and cache data, at most one time per second */ | |
207 | static struct g762_data *g762_update_client(struct device *dev) | |
208 | { | |
209 | struct i2c_client *client = to_i2c_client(dev); | |
210 | struct g762_data *data = i2c_get_clientdata(client); | |
211 | int ret = 0; | |
212 | ||
213 | mutex_lock(&data->update_lock); | |
214 | if (time_before(jiffies, data->last_updated + G762_UPDATE_INTERVAL) && | |
215 | likely(data->valid)) | |
216 | goto out; | |
217 | ||
218 | ret = i2c_smbus_read_byte_data(client, G762_REG_SET_CNT); | |
219 | if (ret < 0) | |
220 | goto out; | |
221 | data->set_cnt = ret; | |
222 | ||
223 | ret = i2c_smbus_read_byte_data(client, G762_REG_ACT_CNT); | |
224 | if (ret < 0) | |
225 | goto out; | |
226 | data->act_cnt = ret; | |
227 | ||
228 | ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_STA); | |
229 | if (ret < 0) | |
230 | goto out; | |
231 | data->fan_sta = ret; | |
232 | ||
233 | ret = i2c_smbus_read_byte_data(client, G762_REG_SET_OUT); | |
234 | if (ret < 0) | |
235 | goto out; | |
236 | data->set_out = ret; | |
237 | ||
238 | ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_CMD1); | |
239 | if (ret < 0) | |
240 | goto out; | |
241 | data->fan_cmd1 = ret; | |
242 | ||
243 | ret = i2c_smbus_read_byte_data(client, G762_REG_FAN_CMD2); | |
244 | if (ret < 0) | |
245 | goto out; | |
246 | data->fan_cmd2 = ret; | |
247 | ||
248 | data->last_updated = jiffies; | |
249 | data->valid = true; | |
250 | out: | |
251 | mutex_unlock(&data->update_lock); | |
252 | ||
253 | if (ret < 0) /* upon error, encode it in return value */ | |
254 | data = ERR_PTR(ret); | |
255 | ||
256 | return data; | |
257 | } | |
258 | ||
259 | /* helpers for writing hardware parameters */ | |
260 | ||
261 | /* | |
262 | * Set input clock frequency received on CLK pin of the chip. Accepted values | |
263 | * are between 0 and 0xffffff. If zero is given, then default frequency | |
264 | * (32,768Hz) is used. Note that clock frequency is a characteristic of the | |
265 | * system but an internal parameter, i.e. value is not passed to the device. | |
266 | */ | |
267 | static int do_set_clk_freq(struct device *dev, unsigned long val) | |
268 | { | |
269 | struct i2c_client *client = to_i2c_client(dev); | |
270 | struct g762_data *data = i2c_get_clientdata(client); | |
271 | ||
272 | if (val > 0xffffff) | |
273 | return -EINVAL; | |
274 | if (!val) | |
275 | val = 32768; | |
276 | ||
277 | data->clk_freq = val; | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | /* Set pwm mode. Accepts either 0 (PWM mode) or 1 (DC mode) */ | |
283 | static int do_set_pwm_mode(struct device *dev, unsigned long val) | |
284 | { | |
285 | struct i2c_client *client = to_i2c_client(dev); | |
286 | struct g762_data *data = g762_update_client(dev); | |
287 | int ret; | |
288 | ||
289 | if (IS_ERR(data)) | |
290 | return PTR_ERR(data); | |
291 | ||
292 | mutex_lock(&data->update_lock); | |
293 | switch (val) { | |
294 | case G762_OUT_MODE_PWM: | |
295 | data->fan_cmd1 |= G762_REG_FAN_CMD1_OUT_MODE; | |
296 | break; | |
297 | case G762_OUT_MODE_DC: | |
298 | data->fan_cmd1 &= ~G762_REG_FAN_CMD1_OUT_MODE; | |
299 | break; | |
300 | default: | |
301 | ret = -EINVAL; | |
302 | goto out; | |
303 | } | |
304 | ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, | |
305 | data->fan_cmd1); | |
306 | data->valid = false; | |
307 | out: | |
308 | mutex_unlock(&data->update_lock); | |
309 | ||
310 | return ret; | |
311 | } | |
312 | ||
313 | /* Set fan clock divisor. Accepts either 1, 2, 4 or 8. */ | |
314 | static int do_set_fan_div(struct device *dev, unsigned long val) | |
315 | { | |
316 | struct i2c_client *client = to_i2c_client(dev); | |
317 | struct g762_data *data = g762_update_client(dev); | |
318 | int ret; | |
319 | ||
320 | if (IS_ERR(data)) | |
321 | return PTR_ERR(data); | |
322 | ||
323 | mutex_lock(&data->update_lock); | |
324 | switch (val) { | |
325 | case 1: | |
326 | data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID0; | |
327 | data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID1; | |
328 | break; | |
329 | case 2: | |
330 | data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID0; | |
331 | data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID1; | |
332 | break; | |
333 | case 4: | |
334 | data->fan_cmd1 &= ~G762_REG_FAN_CMD1_CLK_DIV_ID0; | |
335 | data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID1; | |
336 | break; | |
337 | case 8: | |
338 | data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID0; | |
339 | data->fan_cmd1 |= G762_REG_FAN_CMD1_CLK_DIV_ID1; | |
340 | break; | |
341 | default: | |
342 | ret = -EINVAL; | |
343 | goto out; | |
344 | } | |
345 | ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, | |
346 | data->fan_cmd1); | |
347 | data->valid = false; | |
348 | out: | |
349 | mutex_unlock(&data->update_lock); | |
350 | ||
351 | return ret; | |
352 | } | |
353 | ||
354 | /* Set fan gear mode. Accepts either 0, 1 or 2. */ | |
355 | static int do_set_fan_gear_mode(struct device *dev, unsigned long val) | |
356 | { | |
357 | struct i2c_client *client = to_i2c_client(dev); | |
358 | struct g762_data *data = g762_update_client(dev); | |
359 | int ret; | |
360 | ||
361 | if (IS_ERR(data)) | |
362 | return PTR_ERR(data); | |
363 | ||
364 | mutex_lock(&data->update_lock); | |
365 | switch (val) { | |
366 | case 0: | |
367 | data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_0; | |
368 | data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_1; | |
369 | break; | |
370 | case 1: | |
371 | data->fan_cmd2 |= G762_REG_FAN_CMD2_GEAR_MODE_0; | |
372 | data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_1; | |
373 | break; | |
374 | case 2: | |
375 | data->fan_cmd2 &= ~G762_REG_FAN_CMD2_GEAR_MODE_0; | |
376 | data->fan_cmd2 |= G762_REG_FAN_CMD2_GEAR_MODE_1; | |
377 | break; | |
378 | default: | |
379 | ret = -EINVAL; | |
380 | goto out; | |
381 | } | |
382 | ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD2, | |
383 | data->fan_cmd2); | |
384 | data->valid = false; | |
385 | out: | |
386 | mutex_unlock(&data->update_lock); | |
387 | ||
388 | return ret; | |
389 | } | |
390 | ||
391 | /* Set number of fan pulses per revolution. Accepts either 2 or 4. */ | |
392 | static int do_set_fan_pulses(struct device *dev, unsigned long val) | |
393 | { | |
394 | struct i2c_client *client = to_i2c_client(dev); | |
395 | struct g762_data *data = g762_update_client(dev); | |
396 | int ret; | |
397 | ||
398 | if (IS_ERR(data)) | |
399 | return PTR_ERR(data); | |
400 | ||
401 | mutex_lock(&data->update_lock); | |
402 | switch (val) { | |
403 | case 2: | |
404 | data->fan_cmd1 &= ~G762_REG_FAN_CMD1_PULSE_PER_REV; | |
405 | break; | |
406 | case 4: | |
407 | data->fan_cmd1 |= G762_REG_FAN_CMD1_PULSE_PER_REV; | |
408 | break; | |
409 | default: | |
410 | ret = -EINVAL; | |
411 | goto out; | |
412 | } | |
413 | ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, | |
414 | data->fan_cmd1); | |
415 | data->valid = false; | |
416 | out: | |
417 | mutex_unlock(&data->update_lock); | |
418 | ||
419 | return ret; | |
420 | } | |
421 | ||
422 | /* Set fan mode. Accepts either 1 (open-loop) or 2 (closed-loop). */ | |
423 | static int do_set_pwm_enable(struct device *dev, unsigned long val) | |
424 | { | |
425 | struct i2c_client *client = to_i2c_client(dev); | |
426 | struct g762_data *data = g762_update_client(dev); | |
427 | int ret; | |
428 | ||
429 | if (IS_ERR(data)) | |
430 | return PTR_ERR(data); | |
431 | ||
432 | mutex_lock(&data->update_lock); | |
433 | switch (val) { | |
434 | case G762_FAN_MODE_CLOSED_LOOP: | |
435 | data->fan_cmd1 |= G762_REG_FAN_CMD1_FAN_MODE; | |
436 | break; | |
437 | case G762_FAN_MODE_OPEN_LOOP: | |
438 | data->fan_cmd1 &= ~G762_REG_FAN_CMD1_FAN_MODE; | |
439 | /* | |
440 | * BUG FIX: if SET_CNT register value is 255 then, for some | |
441 | * unknown reason, fan will not rotate as expected, no matter | |
442 | * the value of SET_OUT (to be specific, this seems to happen | |
443 | * only in PWM mode). To workaround this bug, we give SET_CNT | |
444 | * value of 254 if it is 255 when switching to open-loop. | |
445 | */ | |
446 | if (data->set_cnt == 0xff) | |
447 | i2c_smbus_write_byte_data(client, G762_REG_SET_CNT, | |
448 | 254); | |
449 | break; | |
450 | default: | |
451 | ret = -EINVAL; | |
452 | goto out; | |
453 | } | |
454 | ||
455 | ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, | |
456 | data->fan_cmd1); | |
457 | data->valid = false; | |
458 | out: | |
459 | mutex_unlock(&data->update_lock); | |
460 | ||
461 | return ret; | |
462 | } | |
463 | ||
464 | /* Set PWM polarity. Accepts either 0 (positive duty) or 1 (negative duty) */ | |
465 | static int do_set_pwm_polarity(struct device *dev, unsigned long val) | |
466 | { | |
467 | struct i2c_client *client = to_i2c_client(dev); | |
468 | struct g762_data *data = g762_update_client(dev); | |
469 | int ret; | |
470 | ||
471 | if (IS_ERR(data)) | |
472 | return PTR_ERR(data); | |
473 | ||
474 | mutex_lock(&data->update_lock); | |
475 | switch (val) { | |
476 | case G762_PWM_POLARITY_POSITIVE: | |
477 | data->fan_cmd1 &= ~G762_REG_FAN_CMD1_PWM_POLARITY; | |
478 | break; | |
479 | case G762_PWM_POLARITY_NEGATIVE: | |
480 | data->fan_cmd1 |= G762_REG_FAN_CMD1_PWM_POLARITY; | |
481 | break; | |
482 | default: | |
483 | ret = -EINVAL; | |
484 | goto out; | |
485 | } | |
486 | ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, | |
487 | data->fan_cmd1); | |
488 | data->valid = false; | |
489 | out: | |
490 | mutex_unlock(&data->update_lock); | |
491 | ||
492 | return ret; | |
493 | } | |
494 | ||
495 | /* | |
496 | * Set pwm value. Accepts values between 0 (stops the fan) and | |
497 | * 255 (full speed). This only makes sense in open-loop mode. | |
498 | */ | |
499 | static int do_set_pwm(struct device *dev, unsigned long val) | |
500 | { | |
501 | struct i2c_client *client = to_i2c_client(dev); | |
502 | struct g762_data *data = i2c_get_clientdata(client); | |
503 | int ret; | |
504 | ||
505 | if (val > 255) | |
506 | return -EINVAL; | |
507 | ||
508 | mutex_lock(&data->update_lock); | |
509 | ret = i2c_smbus_write_byte_data(client, G762_REG_SET_OUT, val); | |
510 | data->valid = false; | |
511 | mutex_unlock(&data->update_lock); | |
512 | ||
513 | return ret; | |
514 | } | |
515 | ||
516 | /* | |
517 | * Set fan RPM value. Can be called both in closed and open-loop mode | |
518 | * but effect will only be seen after closed-loop mode is configured. | |
519 | */ | |
520 | static int do_set_fan_target(struct device *dev, unsigned long val) | |
521 | { | |
522 | struct i2c_client *client = to_i2c_client(dev); | |
523 | struct g762_data *data = g762_update_client(dev); | |
524 | int ret; | |
525 | ||
526 | if (IS_ERR(data)) | |
527 | return PTR_ERR(data); | |
528 | ||
529 | mutex_lock(&data->update_lock); | |
530 | data->set_cnt = cnt_from_rpm(val, data->clk_freq, | |
531 | G762_PULSE_FROM_REG(data->fan_cmd1), | |
532 | G762_CLKDIV_FROM_REG(data->fan_cmd1), | |
533 | G762_GEARMULT_FROM_REG(data->fan_cmd2)); | |
534 | ret = i2c_smbus_write_byte_data(client, G762_REG_SET_CNT, | |
535 | data->set_cnt); | |
536 | data->valid = false; | |
537 | mutex_unlock(&data->update_lock); | |
538 | ||
539 | return ret; | |
540 | } | |
541 | ||
542 | /* Set fan startup voltage. Accepted values are either 0, 1, 2 or 3. */ | |
543 | static int do_set_fan_startv(struct device *dev, unsigned long val) | |
544 | { | |
545 | struct i2c_client *client = to_i2c_client(dev); | |
546 | struct g762_data *data = g762_update_client(dev); | |
547 | int ret; | |
548 | ||
549 | if (IS_ERR(data)) | |
550 | return PTR_ERR(data); | |
551 | ||
552 | mutex_lock(&data->update_lock); | |
553 | switch (val) { | |
554 | case 0: | |
555 | data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_0; | |
556 | data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_1; | |
557 | break; | |
558 | case 1: | |
559 | data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_0; | |
560 | data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_1; | |
561 | break; | |
562 | case 2: | |
563 | data->fan_cmd2 &= ~G762_REG_FAN_CMD2_FAN_STARTV_0; | |
564 | data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_1; | |
565 | break; | |
566 | case 3: | |
567 | data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_0; | |
568 | data->fan_cmd2 |= G762_REG_FAN_CMD2_FAN_STARTV_1; | |
569 | break; | |
570 | default: | |
571 | ret = -EINVAL; | |
572 | goto out; | |
573 | } | |
574 | ret = i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD2, | |
575 | data->fan_cmd2); | |
576 | data->valid = false; | |
577 | out: | |
578 | mutex_unlock(&data->update_lock); | |
579 | ||
580 | return ret; | |
581 | } | |
582 | ||
583 | /* | |
584 | * Helper to import hardware characteristics from .dts file and push | |
585 | * those to the chip. | |
586 | */ | |
587 | ||
588 | #ifdef CONFIG_OF | |
adaa50b0 | 589 | static const struct of_device_id g762_dt_match[] = { |
594fbe71 AE |
590 | { .compatible = "gmt,g762" }, |
591 | { .compatible = "gmt,g763" }, | |
592 | { }, | |
593 | }; | |
594 | ||
595 | /* | |
596 | * Grab clock (a required property), enable it, get (fixed) clock frequency | |
597 | * and store it. Note: upon success, clock has been prepared and enabled; it | |
598 | * must later be unprepared and disabled (e.g. during module unloading) by a | |
599 | * call to g762_of_clock_disable(). Note that a reference to clock is kept | |
600 | * in our private data structure to be used in this function. | |
601 | */ | |
602 | static int g762_of_clock_enable(struct i2c_client *client) | |
603 | { | |
604 | struct g762_data *data; | |
605 | unsigned long clk_freq; | |
606 | struct clk *clk; | |
607 | int ret; | |
608 | ||
609 | if (!client->dev.of_node) | |
610 | return 0; | |
611 | ||
612 | clk = of_clk_get(client->dev.of_node, 0); | |
613 | if (IS_ERR(clk)) { | |
614 | dev_err(&client->dev, "failed to get clock\n"); | |
615 | return PTR_ERR(clk); | |
616 | } | |
617 | ||
618 | ret = clk_prepare_enable(clk); | |
619 | if (ret) { | |
620 | dev_err(&client->dev, "failed to enable clock\n"); | |
621 | goto clk_put; | |
622 | } | |
623 | ||
624 | clk_freq = clk_get_rate(clk); | |
625 | ret = do_set_clk_freq(&client->dev, clk_freq); | |
626 | if (ret) { | |
627 | dev_err(&client->dev, "invalid clock freq %lu\n", clk_freq); | |
628 | goto clk_unprep; | |
629 | } | |
630 | ||
631 | data = i2c_get_clientdata(client); | |
632 | data->clk = clk; | |
633 | ||
634 | return 0; | |
635 | ||
636 | clk_unprep: | |
637 | clk_disable_unprepare(clk); | |
638 | ||
639 | clk_put: | |
640 | clk_put(clk); | |
641 | ||
642 | return ret; | |
643 | } | |
644 | ||
645 | static void g762_of_clock_disable(struct i2c_client *client) | |
646 | { | |
647 | struct g762_data *data = i2c_get_clientdata(client); | |
648 | ||
649 | if (!data->clk) | |
650 | return; | |
651 | ||
652 | clk_disable_unprepare(data->clk); | |
653 | clk_put(data->clk); | |
654 | } | |
655 | ||
656 | static int g762_of_prop_import_one(struct i2c_client *client, | |
657 | const char *pname, | |
658 | int (*psetter)(struct device *dev, | |
659 | unsigned long val)) | |
660 | { | |
661 | const __be32 *prop; | |
662 | int len, ret; | |
663 | u32 pval; | |
664 | ||
665 | prop = of_get_property(client->dev.of_node, pname, &len); | |
666 | if (!prop || len != sizeof(u32)) | |
667 | return 0; | |
668 | ||
669 | pval = be32_to_cpu(prop[0]); | |
670 | dev_dbg(&client->dev, "found %s (%d)\n", pname, pval); | |
671 | ret = (*psetter)(&client->dev, pval); | |
672 | if (ret) | |
673 | dev_err(&client->dev, "unable to set %s (%d)\n", pname, pval); | |
674 | ||
675 | return ret; | |
676 | } | |
677 | ||
678 | static int g762_of_prop_import(struct i2c_client *client) | |
679 | { | |
680 | int ret; | |
681 | ||
682 | if (!client->dev.of_node) | |
683 | return 0; | |
684 | ||
685 | ret = g762_of_prop_import_one(client, "fan_gear_mode", | |
686 | do_set_fan_gear_mode); | |
687 | if (ret) | |
688 | return ret; | |
689 | ||
690 | ret = g762_of_prop_import_one(client, "pwm_polarity", | |
691 | do_set_pwm_polarity); | |
692 | if (ret) | |
693 | return ret; | |
694 | ||
695 | return g762_of_prop_import_one(client, "fan_startv", | |
696 | do_set_fan_startv); | |
697 | } | |
698 | ||
699 | #else | |
700 | static int g762_of_prop_import(struct i2c_client *client) | |
701 | { | |
702 | return 0; | |
703 | } | |
704 | ||
705 | static int g762_of_clock_enable(struct i2c_client *client) | |
706 | { | |
707 | return 0; | |
708 | } | |
709 | ||
710 | static void g762_of_clock_disable(struct i2c_client *client) { } | |
711 | #endif | |
712 | ||
713 | /* | |
714 | * Helper to import hardware characteristics from .dts file and push | |
715 | * those to the chip. | |
716 | */ | |
717 | ||
718 | static int g762_pdata_prop_import(struct i2c_client *client) | |
719 | { | |
a8b3a3a5 | 720 | struct g762_platform_data *pdata = dev_get_platdata(&client->dev); |
594fbe71 AE |
721 | int ret; |
722 | ||
723 | if (!pdata) | |
724 | return 0; | |
725 | ||
726 | ret = do_set_fan_gear_mode(&client->dev, pdata->fan_gear_mode); | |
727 | if (ret) | |
728 | return ret; | |
729 | ||
730 | ret = do_set_pwm_polarity(&client->dev, pdata->pwm_polarity); | |
731 | if (ret) | |
732 | return ret; | |
733 | ||
734 | ret = do_set_fan_startv(&client->dev, pdata->fan_startv); | |
735 | if (ret) | |
736 | return ret; | |
737 | ||
738 | return do_set_clk_freq(&client->dev, pdata->clk_freq); | |
739 | } | |
740 | ||
741 | /* | |
742 | * sysfs attributes | |
743 | */ | |
744 | ||
745 | /* | |
746 | * Read function for fan1_input sysfs file. Return current fan RPM value, or | |
747 | * 0 if fan is out of control. | |
748 | */ | |
749 | static ssize_t get_fan_rpm(struct device *dev, struct device_attribute *da, | |
750 | char *buf) | |
751 | { | |
752 | struct g762_data *data = g762_update_client(dev); | |
753 | unsigned int rpm = 0; | |
754 | ||
755 | if (IS_ERR(data)) | |
756 | return PTR_ERR(data); | |
757 | ||
758 | mutex_lock(&data->update_lock); | |
759 | /* reverse logic: fan out of control reporting is enabled low */ | |
760 | if (data->fan_sta & G762_REG_FAN_STA_OOC) { | |
761 | rpm = rpm_from_cnt(data->act_cnt, data->clk_freq, | |
762 | G762_PULSE_FROM_REG(data->fan_cmd1), | |
763 | G762_CLKDIV_FROM_REG(data->fan_cmd1), | |
764 | G762_GEARMULT_FROM_REG(data->fan_cmd2)); | |
765 | } | |
766 | mutex_unlock(&data->update_lock); | |
767 | ||
768 | return sprintf(buf, "%u\n", rpm); | |
769 | } | |
770 | ||
771 | /* | |
772 | * Read and write functions for pwm1_mode sysfs file. Get and set fan speed | |
773 | * control mode i.e. PWM (1) or DC (0). | |
774 | */ | |
775 | static ssize_t get_pwm_mode(struct device *dev, struct device_attribute *da, | |
776 | char *buf) | |
777 | { | |
778 | struct g762_data *data = g762_update_client(dev); | |
779 | ||
780 | if (IS_ERR(data)) | |
781 | return PTR_ERR(data); | |
782 | ||
783 | return sprintf(buf, "%d\n", | |
784 | !!(data->fan_cmd1 & G762_REG_FAN_CMD1_OUT_MODE)); | |
785 | } | |
786 | ||
787 | static ssize_t set_pwm_mode(struct device *dev, struct device_attribute *da, | |
788 | const char *buf, size_t count) | |
789 | { | |
790 | unsigned long val; | |
791 | int ret; | |
792 | ||
793 | if (kstrtoul(buf, 10, &val)) | |
794 | return -EINVAL; | |
795 | ||
796 | ret = do_set_pwm_mode(dev, val); | |
797 | if (ret < 0) | |
798 | return ret; | |
799 | ||
800 | return count; | |
801 | } | |
802 | ||
803 | /* | |
804 | * Read and write functions for fan1_div sysfs file. Get and set fan | |
805 | * controller prescaler value | |
806 | */ | |
807 | static ssize_t get_fan_div(struct device *dev, | |
808 | struct device_attribute *da, char *buf) | |
809 | { | |
810 | struct g762_data *data = g762_update_client(dev); | |
811 | ||
812 | if (IS_ERR(data)) | |
813 | return PTR_ERR(data); | |
814 | ||
815 | return sprintf(buf, "%d\n", G762_CLKDIV_FROM_REG(data->fan_cmd1)); | |
816 | } | |
817 | ||
818 | static ssize_t set_fan_div(struct device *dev, | |
819 | struct device_attribute *da, | |
820 | const char *buf, size_t count) | |
821 | { | |
822 | unsigned long val; | |
823 | int ret; | |
824 | ||
825 | if (kstrtoul(buf, 10, &val)) | |
826 | return -EINVAL; | |
827 | ||
828 | ret = do_set_fan_div(dev, val); | |
829 | if (ret < 0) | |
830 | return ret; | |
831 | ||
832 | return count; | |
833 | } | |
834 | ||
835 | /* | |
836 | * Read and write functions for fan1_pulses sysfs file. Get and set number | |
837 | * of tachometer pulses per fan revolution. | |
838 | */ | |
839 | static ssize_t get_fan_pulses(struct device *dev, | |
840 | struct device_attribute *da, char *buf) | |
841 | { | |
842 | struct g762_data *data = g762_update_client(dev); | |
843 | ||
844 | if (IS_ERR(data)) | |
845 | return PTR_ERR(data); | |
846 | ||
847 | return sprintf(buf, "%d\n", G762_PULSE_FROM_REG(data->fan_cmd1)); | |
848 | } | |
849 | ||
850 | static ssize_t set_fan_pulses(struct device *dev, | |
851 | struct device_attribute *da, | |
852 | const char *buf, size_t count) | |
853 | { | |
854 | unsigned long val; | |
855 | int ret; | |
856 | ||
857 | if (kstrtoul(buf, 10, &val)) | |
858 | return -EINVAL; | |
859 | ||
860 | ret = do_set_fan_pulses(dev, val); | |
861 | if (ret < 0) | |
862 | return ret; | |
863 | ||
864 | return count; | |
865 | } | |
866 | ||
867 | /* | |
868 | * Read and write functions for pwm1_enable. Get and set fan speed control mode | |
869 | * (i.e. closed or open-loop). | |
870 | * | |
871 | * Following documentation about hwmon's sysfs interface, a pwm1_enable node | |
872 | * should accept followings: | |
873 | * | |
874 | * 0 : no fan speed control (i.e. fan at full speed) | |
875 | * 1 : manual fan speed control enabled (use pwm[1-*]) (open-loop) | |
876 | * 2+: automatic fan speed control enabled (use fan[1-*]_target) (closed-loop) | |
877 | * | |
878 | * but we do not accept 0 as this mode is not natively supported by the chip | |
879 | * and it is not emulated by g762 driver. -EINVAL is returned in this case. | |
880 | */ | |
881 | static ssize_t get_pwm_enable(struct device *dev, | |
882 | struct device_attribute *da, char *buf) | |
883 | { | |
884 | struct g762_data *data = g762_update_client(dev); | |
885 | ||
886 | if (IS_ERR(data)) | |
887 | return PTR_ERR(data); | |
888 | ||
889 | return sprintf(buf, "%d\n", | |
890 | (!!(data->fan_cmd1 & G762_REG_FAN_CMD1_FAN_MODE)) + 1); | |
891 | } | |
892 | ||
893 | static ssize_t set_pwm_enable(struct device *dev, | |
894 | struct device_attribute *da, | |
895 | const char *buf, size_t count) | |
896 | { | |
897 | unsigned long val; | |
898 | int ret; | |
899 | ||
900 | if (kstrtoul(buf, 10, &val)) | |
901 | return -EINVAL; | |
902 | ||
903 | ret = do_set_pwm_enable(dev, val); | |
904 | if (ret < 0) | |
905 | return ret; | |
906 | ||
907 | return count; | |
908 | } | |
909 | ||
910 | /* | |
911 | * Read and write functions for pwm1 sysfs file. Get and set pwm value | |
912 | * (which affects fan speed) in open-loop mode. 0 stops the fan and 255 | |
913 | * makes it run at full speed. | |
914 | */ | |
915 | static ssize_t get_pwm(struct device *dev, struct device_attribute *da, | |
916 | char *buf) | |
917 | { | |
918 | struct g762_data *data = g762_update_client(dev); | |
919 | ||
920 | if (IS_ERR(data)) | |
921 | return PTR_ERR(data); | |
922 | ||
923 | return sprintf(buf, "%d\n", data->set_out); | |
924 | } | |
925 | ||
926 | static ssize_t set_pwm(struct device *dev, struct device_attribute *da, | |
927 | const char *buf, size_t count) | |
928 | { | |
929 | unsigned long val; | |
930 | int ret; | |
931 | ||
932 | if (kstrtoul(buf, 10, &val)) | |
933 | return -EINVAL; | |
934 | ||
935 | ret = do_set_pwm(dev, val); | |
936 | if (ret < 0) | |
937 | return ret; | |
938 | ||
939 | return count; | |
940 | } | |
941 | ||
942 | /* | |
943 | * Read and write function for fan1_target sysfs file. Get/set the fan speed in | |
944 | * closed-loop mode. Speed is given as a RPM value; then the chip will regulate | |
945 | * the fan speed using pulses from fan tachometer. | |
946 | * | |
947 | * Refer to rpm_from_cnt() implementation above to get info about count number | |
948 | * calculation. | |
949 | * | |
950 | * Also note that due to rounding errors it is possible that you don't read | |
951 | * back exactly the value you have set. | |
952 | */ | |
953 | static ssize_t get_fan_target(struct device *dev, struct device_attribute *da, | |
954 | char *buf) | |
955 | { | |
956 | struct g762_data *data = g762_update_client(dev); | |
957 | unsigned int rpm; | |
958 | ||
959 | if (IS_ERR(data)) | |
960 | return PTR_ERR(data); | |
961 | ||
962 | mutex_lock(&data->update_lock); | |
963 | rpm = rpm_from_cnt(data->set_cnt, data->clk_freq, | |
964 | G762_PULSE_FROM_REG(data->fan_cmd1), | |
965 | G762_CLKDIV_FROM_REG(data->fan_cmd1), | |
966 | G762_GEARMULT_FROM_REG(data->fan_cmd2)); | |
967 | mutex_unlock(&data->update_lock); | |
968 | ||
969 | return sprintf(buf, "%u\n", rpm); | |
970 | } | |
971 | ||
972 | static ssize_t set_fan_target(struct device *dev, struct device_attribute *da, | |
973 | const char *buf, size_t count) | |
974 | { | |
975 | unsigned long val; | |
976 | int ret; | |
977 | ||
978 | if (kstrtoul(buf, 10, &val)) | |
979 | return -EINVAL; | |
980 | ||
981 | ret = do_set_fan_target(dev, val); | |
982 | if (ret < 0) | |
983 | return ret; | |
984 | ||
985 | return count; | |
986 | } | |
987 | ||
988 | /* read function for fan1_fault sysfs file. */ | |
989 | static ssize_t get_fan_failure(struct device *dev, struct device_attribute *da, | |
990 | char *buf) | |
991 | { | |
992 | struct g762_data *data = g762_update_client(dev); | |
993 | ||
994 | if (IS_ERR(data)) | |
995 | return PTR_ERR(data); | |
996 | ||
997 | return sprintf(buf, "%u\n", !!(data->fan_sta & G762_REG_FAN_STA_FAIL)); | |
998 | } | |
999 | ||
1000 | /* | |
1001 | * read function for fan1_alarm sysfs file. Note that OOC condition is | |
1002 | * enabled low | |
1003 | */ | |
1004 | static ssize_t get_fan_ooc(struct device *dev, struct device_attribute *da, | |
1005 | char *buf) | |
1006 | { | |
1007 | struct g762_data *data = g762_update_client(dev); | |
1008 | ||
1009 | if (IS_ERR(data)) | |
1010 | return PTR_ERR(data); | |
1011 | ||
1012 | return sprintf(buf, "%u\n", !(data->fan_sta & G762_REG_FAN_STA_OOC)); | |
1013 | } | |
1014 | ||
1015 | static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm); | |
1016 | static DEVICE_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, get_pwm_mode, set_pwm_mode); | |
1017 | static DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, | |
1018 | get_pwm_enable, set_pwm_enable); | |
1019 | static DEVICE_ATTR(fan1_input, S_IRUGO, get_fan_rpm, NULL); | |
1020 | static DEVICE_ATTR(fan1_alarm, S_IRUGO, get_fan_ooc, NULL); | |
1021 | static DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan_failure, NULL); | |
1022 | static DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, | |
1023 | get_fan_target, set_fan_target); | |
1024 | static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, get_fan_div, set_fan_div); | |
1025 | static DEVICE_ATTR(fan1_pulses, S_IWUSR | S_IRUGO, | |
1026 | get_fan_pulses, set_fan_pulses); | |
1027 | ||
1028 | /* Driver data */ | |
1029 | static struct attribute *g762_attributes[] = { | |
1030 | &dev_attr_fan1_input.attr, | |
1031 | &dev_attr_fan1_alarm.attr, | |
1032 | &dev_attr_fan1_fault.attr, | |
1033 | &dev_attr_fan1_target.attr, | |
1034 | &dev_attr_fan1_div.attr, | |
1035 | &dev_attr_fan1_pulses.attr, | |
1036 | &dev_attr_pwm1.attr, | |
1037 | &dev_attr_pwm1_mode.attr, | |
1038 | &dev_attr_pwm1_enable.attr, | |
1039 | NULL | |
1040 | }; | |
1041 | ||
1042 | static const struct attribute_group g762_group = { | |
1043 | .attrs = g762_attributes, | |
1044 | }; | |
1045 | ||
1046 | /* | |
1047 | * Enable both fan failure detection and fan out of control protection. The | |
1048 | * function does not protect change/access to data structure; it must thus | |
1049 | * only be called during initialization. | |
1050 | */ | |
1051 | static inline int g762_fan_init(struct device *dev) | |
1052 | { | |
1053 | struct i2c_client *client = to_i2c_client(dev); | |
1054 | struct g762_data *data = g762_update_client(dev); | |
1055 | ||
1056 | if (IS_ERR(data)) | |
1057 | return PTR_ERR(data); | |
1058 | ||
1059 | data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_FAIL; | |
1060 | data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_OOC; | |
1061 | data->valid = false; | |
1062 | ||
1063 | return i2c_smbus_write_byte_data(client, G762_REG_FAN_CMD1, | |
1064 | data->fan_cmd1); | |
1065 | } | |
1066 | ||
1067 | static int g762_probe(struct i2c_client *client, const struct i2c_device_id *id) | |
1068 | { | |
1069 | struct g762_data *data; | |
1070 | int ret; | |
1071 | ||
1072 | if (!i2c_check_functionality(client->adapter, | |
1073 | I2C_FUNC_SMBUS_BYTE_DATA)) | |
1074 | return -ENODEV; | |
1075 | ||
1076 | data = devm_kzalloc(&client->dev, sizeof(struct g762_data), GFP_KERNEL); | |
1077 | if (!data) | |
1078 | return -ENOMEM; | |
1079 | ||
1080 | i2c_set_clientdata(client, data); | |
1081 | data->client = client; | |
1082 | mutex_init(&data->update_lock); | |
1083 | ||
1084 | /* Enable fan failure detection and fan out of control protection */ | |
1085 | ret = g762_fan_init(&client->dev); | |
1086 | if (ret) | |
1087 | return ret; | |
1088 | ||
1089 | /* Get configuration via DT ... */ | |
1090 | ret = g762_of_clock_enable(client); | |
1091 | if (ret) | |
1092 | return ret; | |
1093 | ret = g762_of_prop_import(client); | |
1094 | if (ret) | |
1095 | goto clock_dis; | |
1096 | /* ... or platform_data */ | |
1097 | ret = g762_pdata_prop_import(client); | |
1098 | if (ret) | |
1099 | goto clock_dis; | |
1100 | ||
1101 | /* Register sysfs hooks */ | |
1102 | ret = sysfs_create_group(&client->dev.kobj, &g762_group); | |
1103 | if (ret) | |
1104 | goto clock_dis; | |
1105 | ||
1106 | data->hwmon_dev = hwmon_device_register(&client->dev); | |
1107 | if (IS_ERR(data->hwmon_dev)) { | |
1108 | ret = PTR_ERR(data->hwmon_dev); | |
1109 | goto sysfs_rem; | |
1110 | } | |
1111 | ||
1112 | return 0; | |
1113 | ||
1114 | sysfs_rem: | |
1115 | sysfs_remove_group(&client->dev.kobj, &g762_group); | |
1116 | ||
1117 | clock_dis: | |
1118 | g762_of_clock_disable(client); | |
1119 | ||
1120 | return ret; | |
1121 | } | |
1122 | ||
1123 | static int g762_remove(struct i2c_client *client) | |
1124 | { | |
1125 | struct g762_data *data = i2c_get_clientdata(client); | |
1126 | ||
1127 | hwmon_device_unregister(data->hwmon_dev); | |
1128 | sysfs_remove_group(&client->dev.kobj, &g762_group); | |
1129 | g762_of_clock_disable(client); | |
1130 | ||
1131 | return 0; | |
1132 | } | |
1133 | ||
1134 | static struct i2c_driver g762_driver = { | |
1135 | .driver = { | |
1136 | .name = DRVNAME, | |
1137 | .owner = THIS_MODULE, | |
1138 | .of_match_table = of_match_ptr(g762_dt_match), | |
1139 | }, | |
1140 | .probe = g762_probe, | |
1141 | .remove = g762_remove, | |
1142 | .id_table = g762_id, | |
1143 | }; | |
1144 | ||
1145 | module_i2c_driver(g762_driver); | |
1146 | ||
1147 | MODULE_AUTHOR("Arnaud EBALARD <arno@natisbad.org>"); | |
1148 | MODULE_DESCRIPTION("GMT G762/G763 driver"); | |
1149 | MODULE_LICENSE("GPL"); |