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USB: serial: don't call release without attach
[linux-2.6/next.git] / drivers / mfd / wm831x-core.c
blob49b7885c2702ce5ae286b8e267ff75f4ac698c6a
1 /*
2 * wm831x-core.c -- Device access for Wolfson WM831x PMICs
3 *
4 * Copyright 2009 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/i2c.h>
18 #include <linux/bcd.h>
19 #include <linux/delay.h>
20 #include <linux/mfd/core.h>
21
22 #include <linux/mfd/wm831x/core.h>
23 #include <linux/mfd/wm831x/pdata.h>
24 #include <linux/mfd/wm831x/irq.h>
25 #include <linux/mfd/wm831x/auxadc.h>
26 #include <linux/mfd/wm831x/otp.h>
27 #include <linux/mfd/wm831x/regulator.h>
28
29 /* Current settings - values are 2*2^(reg_val/4) microamps. These are
30 * exported since they are used by multiple drivers.
31 */
32 int wm831x_isinkv_values[WM831X_ISINK_MAX_ISEL] = {
33 2,
34 2,
35 3,
36 3,
37 4,
38 5,
39 6,
40 7,
41 8,
42 10,
43 11,
44 13,
45 16,
46 19,
47 23,
48 27,
49 32,
50 38,
51 45,
52 54,
53 64,
54 76,
55 91,
56 108,
57 128,
58 152,
59 181,
60 215,
61 256,
62 304,
63 362,
64 431,
65 512,
66 609,
67 724,
68 861,
69 1024,
70 1218,
71 1448,
72 1722,
73 2048,
74 2435,
75 2896,
76 3444,
77 4096,
78 4871,
79 5793,
80 6889,
81 8192,
82 9742,
83 11585,
84 13777,
85 16384,
86 19484,
87 23170,
88 27554,
89 };
90 EXPORT_SYMBOL_GPL(wm831x_isinkv_values);
91
92 enum wm831x_parent {
93 WM8310 = 0,
94 WM8311 = 1,
95 WM8312 = 2,
96 };
97
98 static int wm831x_reg_locked(struct wm831x *wm831x, unsigned short reg)
99 {
100 if (!wm831x->locked)
101 return 0;
102
103 switch (reg) {
104 case WM831X_WATCHDOG:
105 case WM831X_DC4_CONTROL:
106 case WM831X_ON_PIN_CONTROL:
107 case WM831X_BACKUP_CHARGER_CONTROL:
108 case WM831X_CHARGER_CONTROL_1:
109 case WM831X_CHARGER_CONTROL_2:
110 return 1;
111
112 default:
113 return 0;
114 }
115 }
116
117 /**
118 * wm831x_reg_unlock: Unlock user keyed registers
119 *
120 * The WM831x has a user key preventing writes to particularly
121 * critical registers. This function locks those registers,
122 * allowing writes to them.
123 */
124 void wm831x_reg_lock(struct wm831x *wm831x)
125 {
126 int ret;
127
128 ret = wm831x_reg_write(wm831x, WM831X_SECURITY_KEY, 0);
129 if (ret == 0) {
130 dev_vdbg(wm831x->dev, "Registers locked\n");
131
132 mutex_lock(&wm831x->io_lock);
133 WARN_ON(wm831x->locked);
134 wm831x->locked = 1;
135 mutex_unlock(&wm831x->io_lock);
136 } else {
137 dev_err(wm831x->dev, "Failed to lock registers: %d\n", ret);
138 }
139
140 }
141 EXPORT_SYMBOL_GPL(wm831x_reg_lock);
142
143 /**
144 * wm831x_reg_unlock: Unlock user keyed registers
145 *
146 * The WM831x has a user key preventing writes to particularly
147 * critical registers. This function locks those registers,
148 * preventing spurious writes.
149 */
150 int wm831x_reg_unlock(struct wm831x *wm831x)
151 {
152 int ret;
153
154 /* 0x9716 is the value required to unlock the registers */
155 ret = wm831x_reg_write(wm831x, WM831X_SECURITY_KEY, 0x9716);
156 if (ret == 0) {
157 dev_vdbg(wm831x->dev, "Registers unlocked\n");
158
159 mutex_lock(&wm831x->io_lock);
160 WARN_ON(!wm831x->locked);
161 wm831x->locked = 0;
162 mutex_unlock(&wm831x->io_lock);
163 }
164
165 return ret;
166 }
167 EXPORT_SYMBOL_GPL(wm831x_reg_unlock);
168
169 static int wm831x_read(struct wm831x *wm831x, unsigned short reg,
170 int bytes, void *dest)
171 {
172 int ret, i;
173 u16 *buf = dest;
174
175 BUG_ON(bytes % 2);
176 BUG_ON(bytes <= 0);
177
178 ret = wm831x->read_dev(wm831x, reg, bytes, dest);
179 if (ret < 0)
180 return ret;
181
182 for (i = 0; i < bytes / 2; i++) {
183 buf[i] = be16_to_cpu(buf[i]);
184
185 dev_vdbg(wm831x->dev, "Read %04x from R%d(0x%x)\n",
186 buf[i], reg + i, reg + i);
187 }
188
189 return 0;
190 }
191
192 /**
193 * wm831x_reg_read: Read a single WM831x register.
194 *
195 * @wm831x: Device to read from.
196 * @reg: Register to read.
197 */
198 int wm831x_reg_read(struct wm831x *wm831x, unsigned short reg)
199 {
200 unsigned short val;
201 int ret;
202
203 mutex_lock(&wm831x->io_lock);
204
205 ret = wm831x_read(wm831x, reg, 2, &val);
206
207 mutex_unlock(&wm831x->io_lock);
208
209 if (ret < 0)
210 return ret;
211 else
212 return val;
213 }
214 EXPORT_SYMBOL_GPL(wm831x_reg_read);
215
216 /**
217 * wm831x_bulk_read: Read multiple WM831x registers
218 *
219 * @wm831x: Device to read from
220 * @reg: First register
221 * @count: Number of registers
222 * @buf: Buffer to fill.
223 */
224 int wm831x_bulk_read(struct wm831x *wm831x, unsigned short reg,
225 int count, u16 *buf)
226 {
227 int ret;
228
229 mutex_lock(&wm831x->io_lock);
230
231 ret = wm831x_read(wm831x, reg, count * 2, buf);
232
233 mutex_unlock(&wm831x->io_lock);
234
235 return ret;
236 }
237 EXPORT_SYMBOL_GPL(wm831x_bulk_read);
238
239 static int wm831x_write(struct wm831x *wm831x, unsigned short reg,
240 int bytes, void *src)
241 {
242 u16 *buf = src;
243 int i;
244
245 BUG_ON(bytes % 2);
246 BUG_ON(bytes <= 0);
247
248 for (i = 0; i < bytes / 2; i++) {
249 if (wm831x_reg_locked(wm831x, reg))
250 return -EPERM;
251
252 dev_vdbg(wm831x->dev, "Write %04x to R%d(0x%x)\n",
253 buf[i], reg + i, reg + i);
254
255 buf[i] = cpu_to_be16(buf[i]);
256 }
257
258 return wm831x->write_dev(wm831x, reg, bytes, src);
259 }
260
261 /**
262 * wm831x_reg_write: Write a single WM831x register.
263 *
264 * @wm831x: Device to write to.
265 * @reg: Register to write to.
266 * @val: Value to write.
267 */
268 int wm831x_reg_write(struct wm831x *wm831x, unsigned short reg,
269 unsigned short val)
270 {
271 int ret;
272
273 mutex_lock(&wm831x->io_lock);
274
275 ret = wm831x_write(wm831x, reg, 2, &val);
276
277 mutex_unlock(&wm831x->io_lock);
278
279 return ret;
280 }
281 EXPORT_SYMBOL_GPL(wm831x_reg_write);
282
283 /**
284 * wm831x_set_bits: Set the value of a bitfield in a WM831x register
285 *
286 * @wm831x: Device to write to.
287 * @reg: Register to write to.
288 * @mask: Mask of bits to set.
289 * @val: Value to set (unshifted)
290 */
291 int wm831x_set_bits(struct wm831x *wm831x, unsigned short reg,
292 unsigned short mask, unsigned short val)
293 {
294 int ret;
295 u16 r;
296
297 mutex_lock(&wm831x->io_lock);
298
299 ret = wm831x_read(wm831x, reg, 2, &r);
300 if (ret < 0)
301 goto out;
302
303 r &= ~mask;
304 r |= val;
305
306 ret = wm831x_write(wm831x, reg, 2, &r);
307
308 out:
309 mutex_unlock(&wm831x->io_lock);
310
311 return ret;
312 }
313 EXPORT_SYMBOL_GPL(wm831x_set_bits);
314
315 /**
316 * wm831x_auxadc_read: Read a value from the WM831x AUXADC
317 *
318 * @wm831x: Device to read from.
319 * @input: AUXADC input to read.
320 */
321 int wm831x_auxadc_read(struct wm831x *wm831x, enum wm831x_auxadc input)
322 {
323 int tries = 10;
324 int ret, src;
325
326 mutex_lock(&wm831x->auxadc_lock);
327
328 ret = wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL,
329 WM831X_AUX_ENA, WM831X_AUX_ENA);
330 if (ret < 0) {
331 dev_err(wm831x->dev, "Failed to enable AUXADC: %d\n", ret);
332 goto out;
333 }
334
335 /* We force a single source at present */
336 src = input;
337 ret = wm831x_reg_write(wm831x, WM831X_AUXADC_SOURCE,
338 1 << src);
339 if (ret < 0) {
340 dev_err(wm831x->dev, "Failed to set AUXADC source: %d\n", ret);
341 goto out;
342 }
343
344 ret = wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL,
345 WM831X_AUX_CVT_ENA, WM831X_AUX_CVT_ENA);
346 if (ret < 0) {
347 dev_err(wm831x->dev, "Failed to start AUXADC: %d\n", ret);
348 goto disable;
349 }
350
351 do {
352 msleep(1);
353
354 ret = wm831x_reg_read(wm831x, WM831X_AUXADC_CONTROL);
355 if (ret < 0)
356 ret = WM831X_AUX_CVT_ENA;
357 } while ((ret & WM831X_AUX_CVT_ENA) && --tries);
358
359 if (ret & WM831X_AUX_CVT_ENA) {
360 dev_err(wm831x->dev, "Timed out reading AUXADC\n");
361 ret = -EBUSY;
362 goto disable;
363 }
364
365 ret = wm831x_reg_read(wm831x, WM831X_AUXADC_DATA);
366 if (ret < 0) {
367 dev_err(wm831x->dev, "Failed to read AUXADC data: %d\n", ret);
368 } else {
369 src = ((ret & WM831X_AUX_DATA_SRC_MASK)
370 >> WM831X_AUX_DATA_SRC_SHIFT) - 1;
371
372 if (src == 14)
373 src = WM831X_AUX_CAL;
374
375 if (src != input) {
376 dev_err(wm831x->dev, "Data from source %d not %d\n",
377 src, input);
378 ret = -EINVAL;
379 } else {
380 ret &= WM831X_AUX_DATA_MASK;
381 }
382 }
383
384 disable:
385 wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL, WM831X_AUX_ENA, 0);
386 out:
387 mutex_unlock(&wm831x->auxadc_lock);
388 return ret;
389 }
390 EXPORT_SYMBOL_GPL(wm831x_auxadc_read);
391
392 /**
393 * wm831x_auxadc_read_uv: Read a voltage from the WM831x AUXADC
394 *
395 * @wm831x: Device to read from.
396 * @input: AUXADC input to read.
397 */
398 int wm831x_auxadc_read_uv(struct wm831x *wm831x, enum wm831x_auxadc input)
399 {
400 int ret;
401
402 ret = wm831x_auxadc_read(wm831x, input);
403 if (ret < 0)
404 return ret;
405
406 ret *= 1465;
407
408 return ret;
409 }
410 EXPORT_SYMBOL_GPL(wm831x_auxadc_read_uv);
411
412 static struct resource wm831x_dcdc1_resources[] = {
413 {
414 .start = WM831X_DC1_CONTROL_1,
415 .end = WM831X_DC1_DVS_CONTROL,
416 .flags = IORESOURCE_IO,
417 },
418 {
419 .name = "UV",
420 .start = WM831X_IRQ_UV_DC1,
421 .end = WM831X_IRQ_UV_DC1,
422 .flags = IORESOURCE_IRQ,
423 },
424 {
425 .name = "HC",
426 .start = WM831X_IRQ_HC_DC1,
427 .end = WM831X_IRQ_HC_DC1,
428 .flags = IORESOURCE_IRQ,
429 },
430 };
431
432
433 static struct resource wm831x_dcdc2_resources[] = {
434 {
435 .start = WM831X_DC2_CONTROL_1,
436 .end = WM831X_DC2_DVS_CONTROL,
437 .flags = IORESOURCE_IO,
438 },
439 {
440 .name = "UV",
441 .start = WM831X_IRQ_UV_DC2,
442 .end = WM831X_IRQ_UV_DC2,
443 .flags = IORESOURCE_IRQ,
444 },
445 {
446 .name = "HC",
447 .start = WM831X_IRQ_HC_DC2,
448 .end = WM831X_IRQ_HC_DC2,
449 .flags = IORESOURCE_IRQ,
450 },
451 };
452
453 static struct resource wm831x_dcdc3_resources[] = {
454 {
455 .start = WM831X_DC3_CONTROL_1,
456 .end = WM831X_DC3_SLEEP_CONTROL,
457 .flags = IORESOURCE_IO,
458 },
459 {
460 .name = "UV",
461 .start = WM831X_IRQ_UV_DC3,
462 .end = WM831X_IRQ_UV_DC3,
463 .flags = IORESOURCE_IRQ,
464 },
465 };
466
467 static struct resource wm831x_dcdc4_resources[] = {
468 {
469 .start = WM831X_DC4_CONTROL,
470 .end = WM831X_DC4_SLEEP_CONTROL,
471 .flags = IORESOURCE_IO,
472 },
473 {
474 .name = "UV",
475 .start = WM831X_IRQ_UV_DC4,
476 .end = WM831X_IRQ_UV_DC4,
477 .flags = IORESOURCE_IRQ,
478 },
479 };
480
481 static struct resource wm831x_gpio_resources[] = {
482 {
483 .start = WM831X_IRQ_GPIO_1,
484 .end = WM831X_IRQ_GPIO_16,
485 .flags = IORESOURCE_IRQ,
486 },
487 };
488
489 static struct resource wm831x_isink1_resources[] = {
490 {
491 .start = WM831X_CURRENT_SINK_1,
492 .end = WM831X_CURRENT_SINK_1,
493 .flags = IORESOURCE_IO,
494 },
495 {
496 .start = WM831X_IRQ_CS1,
497 .end = WM831X_IRQ_CS1,
498 .flags = IORESOURCE_IRQ,
499 },
500 };
501
502 static struct resource wm831x_isink2_resources[] = {
503 {
504 .start = WM831X_CURRENT_SINK_2,
505 .end = WM831X_CURRENT_SINK_2,
506 .flags = IORESOURCE_IO,
507 },
508 {
509 .start = WM831X_IRQ_CS2,
510 .end = WM831X_IRQ_CS2,
511 .flags = IORESOURCE_IRQ,
512 },
513 };
514
515 static struct resource wm831x_ldo1_resources[] = {
516 {
517 .start = WM831X_LDO1_CONTROL,
518 .end = WM831X_LDO1_SLEEP_CONTROL,
519 .flags = IORESOURCE_IO,
520 },
521 {
522 .name = "UV",
523 .start = WM831X_IRQ_UV_LDO1,
524 .end = WM831X_IRQ_UV_LDO1,
525 .flags = IORESOURCE_IRQ,
526 },
527 };
528
529 static struct resource wm831x_ldo2_resources[] = {
530 {
531 .start = WM831X_LDO2_CONTROL,
532 .end = WM831X_LDO2_SLEEP_CONTROL,
533 .flags = IORESOURCE_IO,
534 },
535 {
536 .name = "UV",
537 .start = WM831X_IRQ_UV_LDO2,
538 .end = WM831X_IRQ_UV_LDO2,
539 .flags = IORESOURCE_IRQ,
540 },
541 };
542
543 static struct resource wm831x_ldo3_resources[] = {
544 {
545 .start = WM831X_LDO3_CONTROL,
546 .end = WM831X_LDO3_SLEEP_CONTROL,
547 .flags = IORESOURCE_IO,
548 },
549 {
550 .name = "UV",
551 .start = WM831X_IRQ_UV_LDO3,
552 .end = WM831X_IRQ_UV_LDO3,
553 .flags = IORESOURCE_IRQ,
554 },
555 };
556
557 static struct resource wm831x_ldo4_resources[] = {
558 {
559 .start = WM831X_LDO4_CONTROL,
560 .end = WM831X_LDO4_SLEEP_CONTROL,
561 .flags = IORESOURCE_IO,
562 },
563 {
564 .name = "UV",
565 .start = WM831X_IRQ_UV_LDO4,
566 .end = WM831X_IRQ_UV_LDO4,
567 .flags = IORESOURCE_IRQ,
568 },
569 };
570
571 static struct resource wm831x_ldo5_resources[] = {
572 {
573 .start = WM831X_LDO5_CONTROL,
574 .end = WM831X_LDO5_SLEEP_CONTROL,
575 .flags = IORESOURCE_IO,
576 },
577 {
578 .name = "UV",
579 .start = WM831X_IRQ_UV_LDO5,
580 .end = WM831X_IRQ_UV_LDO5,
581 .flags = IORESOURCE_IRQ,
582 },
583 };
584
585 static struct resource wm831x_ldo6_resources[] = {
586 {
587 .start = WM831X_LDO6_CONTROL,
588 .end = WM831X_LDO6_SLEEP_CONTROL,
589 .flags = IORESOURCE_IO,
590 },
591 {
592 .name = "UV",
593 .start = WM831X_IRQ_UV_LDO6,
594 .end = WM831X_IRQ_UV_LDO6,
595 .flags = IORESOURCE_IRQ,
596 },
597 };
598
599 static struct resource wm831x_ldo7_resources[] = {
600 {
601 .start = WM831X_LDO7_CONTROL,
602 .end = WM831X_LDO7_SLEEP_CONTROL,
603 .flags = IORESOURCE_IO,
604 },
605 {
606 .name = "UV",
607 .start = WM831X_IRQ_UV_LDO7,
608 .end = WM831X_IRQ_UV_LDO7,
609 .flags = IORESOURCE_IRQ,
610 },
611 };
612
613 static struct resource wm831x_ldo8_resources[] = {
614 {
615 .start = WM831X_LDO8_CONTROL,
616 .end = WM831X_LDO8_SLEEP_CONTROL,
617 .flags = IORESOURCE_IO,
618 },
619 {
620 .name = "UV",
621 .start = WM831X_IRQ_UV_LDO8,
622 .end = WM831X_IRQ_UV_LDO8,
623 .flags = IORESOURCE_IRQ,
624 },
625 };
626
627 static struct resource wm831x_ldo9_resources[] = {
628 {
629 .start = WM831X_LDO9_CONTROL,
630 .end = WM831X_LDO9_SLEEP_CONTROL,
631 .flags = IORESOURCE_IO,
632 },
633 {
634 .name = "UV",
635 .start = WM831X_IRQ_UV_LDO9,
636 .end = WM831X_IRQ_UV_LDO9,
637 .flags = IORESOURCE_IRQ,
638 },
639 };
640
641 static struct resource wm831x_ldo10_resources[] = {
642 {
643 .start = WM831X_LDO10_CONTROL,
644 .end = WM831X_LDO10_SLEEP_CONTROL,
645 .flags = IORESOURCE_IO,
646 },
647 {
648 .name = "UV",
649 .start = WM831X_IRQ_UV_LDO10,
650 .end = WM831X_IRQ_UV_LDO10,
651 .flags = IORESOURCE_IRQ,
652 },
653 };
654
655 static struct resource wm831x_ldo11_resources[] = {
656 {
657 .start = WM831X_LDO11_ON_CONTROL,
658 .end = WM831X_LDO11_SLEEP_CONTROL,
659 .flags = IORESOURCE_IO,
660 },
661 };
662
663 static struct resource wm831x_on_resources[] = {
664 {
665 .start = WM831X_IRQ_ON,
666 .end = WM831X_IRQ_ON,
667 .flags = IORESOURCE_IRQ,
668 },
669 };
670
671
672 static struct resource wm831x_power_resources[] = {
673 {
674 .name = "SYSLO",
675 .start = WM831X_IRQ_PPM_SYSLO,
676 .end = WM831X_IRQ_PPM_SYSLO,
677 .flags = IORESOURCE_IRQ,
678 },
679 {
680 .name = "PWR SRC",
681 .start = WM831X_IRQ_PPM_PWR_SRC,
682 .end = WM831X_IRQ_PPM_PWR_SRC,
683 .flags = IORESOURCE_IRQ,
684 },
685 {
686 .name = "USB CURR",
687 .start = WM831X_IRQ_PPM_USB_CURR,
688 .end = WM831X_IRQ_PPM_USB_CURR,
689 .flags = IORESOURCE_IRQ,
690 },
691 {
692 .name = "BATT HOT",
693 .start = WM831X_IRQ_CHG_BATT_HOT,
694 .end = WM831X_IRQ_CHG_BATT_HOT,
695 .flags = IORESOURCE_IRQ,
696 },
697 {
698 .name = "BATT COLD",
699 .start = WM831X_IRQ_CHG_BATT_COLD,
700 .end = WM831X_IRQ_CHG_BATT_COLD,
701 .flags = IORESOURCE_IRQ,
702 },
703 {
704 .name = "BATT FAIL",
705 .start = WM831X_IRQ_CHG_BATT_FAIL,
706 .end = WM831X_IRQ_CHG_BATT_FAIL,
707 .flags = IORESOURCE_IRQ,
708 },
709 {
710 .name = "OV",
711 .start = WM831X_IRQ_CHG_OV,
712 .end = WM831X_IRQ_CHG_OV,
713 .flags = IORESOURCE_IRQ,
714 },
715 {
716 .name = "END",
717 .start = WM831X_IRQ_CHG_END,
718 .end = WM831X_IRQ_CHG_END,
719 .flags = IORESOURCE_IRQ,
720 },
721 {
722 .name = "TO",
723 .start = WM831X_IRQ_CHG_TO,
724 .end = WM831X_IRQ_CHG_TO,
725 .flags = IORESOURCE_IRQ,
726 },
727 {
728 .name = "MODE",
729 .start = WM831X_IRQ_CHG_MODE,
730 .end = WM831X_IRQ_CHG_MODE,
731 .flags = IORESOURCE_IRQ,
732 },
733 {
734 .name = "START",
735 .start = WM831X_IRQ_CHG_START,
736 .end = WM831X_IRQ_CHG_START,
737 .flags = IORESOURCE_IRQ,
738 },
739 };
740
741 static struct resource wm831x_rtc_resources[] = {
742 {
743 .name = "PER",
744 .start = WM831X_IRQ_RTC_PER,
745 .end = WM831X_IRQ_RTC_PER,
746 .flags = IORESOURCE_IRQ,
747 },
748 {
749 .name = "ALM",
750 .start = WM831X_IRQ_RTC_ALM,
751 .end = WM831X_IRQ_RTC_ALM,
752 .flags = IORESOURCE_IRQ,
753 },
754 };
755
756 static struct resource wm831x_status1_resources[] = {
757 {
758 .start = WM831X_STATUS_LED_1,
759 .end = WM831X_STATUS_LED_1,
760 .flags = IORESOURCE_IO,
761 },
762 };
763
764 static struct resource wm831x_status2_resources[] = {
765 {
766 .start = WM831X_STATUS_LED_2,
767 .end = WM831X_STATUS_LED_2,
768 .flags = IORESOURCE_IO,
769 },
770 };
771
772 static struct resource wm831x_touch_resources[] = {
773 {
774 .name = "TCHPD",
775 .start = WM831X_IRQ_TCHPD,
776 .end = WM831X_IRQ_TCHPD,
777 .flags = IORESOURCE_IRQ,
778 },
779 {
780 .name = "TCHDATA",
781 .start = WM831X_IRQ_TCHDATA,
782 .end = WM831X_IRQ_TCHDATA,
783 .flags = IORESOURCE_IRQ,
784 },
785 };
786
787 static struct resource wm831x_wdt_resources[] = {
788 {
789 .start = WM831X_IRQ_WDOG_TO,
790 .end = WM831X_IRQ_WDOG_TO,
791 .flags = IORESOURCE_IRQ,
792 },
793 };
794
795 static struct mfd_cell wm8310_devs[] = {
796 {
797 .name = "wm831x-buckv",
798 .id = 1,
799 .num_resources = ARRAY_SIZE(wm831x_dcdc1_resources),
800 .resources = wm831x_dcdc1_resources,
801 },
802 {
803 .name = "wm831x-buckv",
804 .id = 2,
805 .num_resources = ARRAY_SIZE(wm831x_dcdc2_resources),
806 .resources = wm831x_dcdc2_resources,
807 },
808 {
809 .name = "wm831x-buckp",
810 .id = 3,
811 .num_resources = ARRAY_SIZE(wm831x_dcdc3_resources),
812 .resources = wm831x_dcdc3_resources,
813 },
814 {
815 .name = "wm831x-boostp",
816 .id = 4,
817 .num_resources = ARRAY_SIZE(wm831x_dcdc4_resources),
818 .resources = wm831x_dcdc4_resources,
819 },
820 {
821 .name = "wm831x-epe",
822 .id = 1,
823 },
824 {
825 .name = "wm831x-epe",
826 .id = 2,
827 },
828 {
829 .name = "wm831x-gpio",
830 .num_resources = ARRAY_SIZE(wm831x_gpio_resources),
831 .resources = wm831x_gpio_resources,
832 },
833 {
834 .name = "wm831x-hwmon",
835 },
836 {
837 .name = "wm831x-isink",
838 .id = 1,
839 .num_resources = ARRAY_SIZE(wm831x_isink1_resources),
840 .resources = wm831x_isink1_resources,
841 },
842 {
843 .name = "wm831x-isink",
844 .id = 2,
845 .num_resources = ARRAY_SIZE(wm831x_isink2_resources),
846 .resources = wm831x_isink2_resources,
847 },
848 {
849 .name = "wm831x-ldo",
850 .id = 1,
851 .num_resources = ARRAY_SIZE(wm831x_ldo1_resources),
852 .resources = wm831x_ldo1_resources,
853 },
854 {
855 .name = "wm831x-ldo",
856 .id = 2,
857 .num_resources = ARRAY_SIZE(wm831x_ldo2_resources),
858 .resources = wm831x_ldo2_resources,
859 },
860 {
861 .name = "wm831x-ldo",
862 .id = 3,
863 .num_resources = ARRAY_SIZE(wm831x_ldo3_resources),
864 .resources = wm831x_ldo3_resources,
865 },
866 {
867 .name = "wm831x-ldo",
868 .id = 4,
869 .num_resources = ARRAY_SIZE(wm831x_ldo4_resources),
870 .resources = wm831x_ldo4_resources,
871 },
872 {
873 .name = "wm831x-ldo",
874 .id = 5,
875 .num_resources = ARRAY_SIZE(wm831x_ldo5_resources),
876 .resources = wm831x_ldo5_resources,
877 },
878 {
879 .name = "wm831x-ldo",
880 .id = 6,
881 .num_resources = ARRAY_SIZE(wm831x_ldo6_resources),
882 .resources = wm831x_ldo6_resources,
883 },
884 {
885 .name = "wm831x-aldo",
886 .id = 7,
887 .num_resources = ARRAY_SIZE(wm831x_ldo7_resources),
888 .resources = wm831x_ldo7_resources,
889 },
890 {
891 .name = "wm831x-aldo",
892 .id = 8,
893 .num_resources = ARRAY_SIZE(wm831x_ldo8_resources),
894 .resources = wm831x_ldo8_resources,
895 },
896 {
897 .name = "wm831x-aldo",
898 .id = 9,
899 .num_resources = ARRAY_SIZE(wm831x_ldo9_resources),
900 .resources = wm831x_ldo9_resources,
901 },
902 {
903 .name = "wm831x-aldo",
904 .id = 10,
905 .num_resources = ARRAY_SIZE(wm831x_ldo10_resources),
906 .resources = wm831x_ldo10_resources,
907 },
908 {
909 .name = "wm831x-alive-ldo",
910 .id = 11,
911 .num_resources = ARRAY_SIZE(wm831x_ldo11_resources),
912 .resources = wm831x_ldo11_resources,
913 },
914 {
915 .name = "wm831x-on",
916 .num_resources = ARRAY_SIZE(wm831x_on_resources),
917 .resources = wm831x_on_resources,
918 },
919 {
920 .name = "wm831x-power",
921 .num_resources = ARRAY_SIZE(wm831x_power_resources),
922 .resources = wm831x_power_resources,
923 },
924 {
925 .name = "wm831x-rtc",
926 .num_resources = ARRAY_SIZE(wm831x_rtc_resources),
927 .resources = wm831x_rtc_resources,
928 },
929 {
930 .name = "wm831x-status",
931 .id = 1,
932 .num_resources = ARRAY_SIZE(wm831x_status1_resources),
933 .resources = wm831x_status1_resources,
934 },
935 {
936 .name = "wm831x-status",
937 .id = 2,
938 .num_resources = ARRAY_SIZE(wm831x_status2_resources),
939 .resources = wm831x_status2_resources,
940 },
941 {
942 .name = "wm831x-watchdog",
943 .num_resources = ARRAY_SIZE(wm831x_wdt_resources),
944 .resources = wm831x_wdt_resources,
945 },
946 };
947
948 static struct mfd_cell wm8311_devs[] = {
949 {
950 .name = "wm831x-buckv",
951 .id = 1,
952 .num_resources = ARRAY_SIZE(wm831x_dcdc1_resources),
953 .resources = wm831x_dcdc1_resources,
954 },
955 {
956 .name = "wm831x-buckv",
957 .id = 2,
958 .num_resources = ARRAY_SIZE(wm831x_dcdc2_resources),
959 .resources = wm831x_dcdc2_resources,
960 },
961 {
962 .name = "wm831x-buckp",
963 .id = 3,
964 .num_resources = ARRAY_SIZE(wm831x_dcdc3_resources),
965 .resources = wm831x_dcdc3_resources,
966 },
967 {
968 .name = "wm831x-boostp",
969 .id = 4,
970 .num_resources = ARRAY_SIZE(wm831x_dcdc4_resources),
971 .resources = wm831x_dcdc4_resources,
972 },
973 {
974 .name = "wm831x-epe",
975 .id = 1,
976 },
977 {
978 .name = "wm831x-epe",
979 .id = 2,
980 },
981 {
982 .name = "wm831x-gpio",
983 .num_resources = ARRAY_SIZE(wm831x_gpio_resources),
984 .resources = wm831x_gpio_resources,
985 },
986 {
987 .name = "wm831x-hwmon",
988 },
989 {
990 .name = "wm831x-isink",
991 .id = 1,
992 .num_resources = ARRAY_SIZE(wm831x_isink1_resources),
993 .resources = wm831x_isink1_resources,
994 },
995 {
996 .name = "wm831x-isink",
997 .id = 2,
998 .num_resources = ARRAY_SIZE(wm831x_isink2_resources),
999 .resources = wm831x_isink2_resources,
1000 },
1001 {
1002 .name = "wm831x-ldo",
1003 .id = 1,
1004 .num_resources = ARRAY_SIZE(wm831x_ldo1_resources),
1005 .resources = wm831x_ldo1_resources,
1006 },
1007 {
1008 .name = "wm831x-ldo",
1009 .id = 2,
1010 .num_resources = ARRAY_SIZE(wm831x_ldo2_resources),
1011 .resources = wm831x_ldo2_resources,
1012 },
1013 {
1014 .name = "wm831x-ldo",
1015 .id = 3,
1016 .num_resources = ARRAY_SIZE(wm831x_ldo3_resources),
1017 .resources = wm831x_ldo3_resources,
1018 },
1019 {
1020 .name = "wm831x-ldo",
1021 .id = 4,
1022 .num_resources = ARRAY_SIZE(wm831x_ldo4_resources),
1023 .resources = wm831x_ldo4_resources,
1024 },
1025 {
1026 .name = "wm831x-ldo",
1027 .id = 5,
1028 .num_resources = ARRAY_SIZE(wm831x_ldo5_resources),
1029 .resources = wm831x_ldo5_resources,
1030 },
1031 {
1032 .name = "wm831x-aldo",
1033 .id = 7,
1034 .num_resources = ARRAY_SIZE(wm831x_ldo7_resources),
1035 .resources = wm831x_ldo7_resources,
1036 },
1037 {
1038 .name = "wm831x-alive-ldo",
1039 .id = 11,
1040 .num_resources = ARRAY_SIZE(wm831x_ldo11_resources),
1041 .resources = wm831x_ldo11_resources,
1042 },
1043 {
1044 .name = "wm831x-on",
1045 .num_resources = ARRAY_SIZE(wm831x_on_resources),
1046 .resources = wm831x_on_resources,
1047 },
1048 {
1049 .name = "wm831x-power",
1050 .num_resources = ARRAY_SIZE(wm831x_power_resources),
1051 .resources = wm831x_power_resources,
1052 },
1053 {
1054 .name = "wm831x-rtc",
1055 .num_resources = ARRAY_SIZE(wm831x_rtc_resources),
1056 .resources = wm831x_rtc_resources,
1057 },
1058 {
1059 .name = "wm831x-status",
1060 .id = 1,
1061 .num_resources = ARRAY_SIZE(wm831x_status1_resources),
1062 .resources = wm831x_status1_resources,
1063 },
1064 {
1065 .name = "wm831x-status",
1066 .id = 2,
1067 .num_resources = ARRAY_SIZE(wm831x_status2_resources),
1068 .resources = wm831x_status2_resources,
1069 },
1070 {
1071 .name = "wm831x-touch",
1072 .num_resources = ARRAY_SIZE(wm831x_touch_resources),
1073 .resources = wm831x_touch_resources,
1074 },
1075 {
1076 .name = "wm831x-watchdog",
1077 .num_resources = ARRAY_SIZE(wm831x_wdt_resources),
1078 .resources = wm831x_wdt_resources,
1079 },
1080 };
1081
1082 static struct mfd_cell wm8312_devs[] = {
1083 {
1084 .name = "wm831x-buckv",
1085 .id = 1,
1086 .num_resources = ARRAY_SIZE(wm831x_dcdc1_resources),
1087 .resources = wm831x_dcdc1_resources,
1088 },
1089 {
1090 .name = "wm831x-buckv",
1091 .id = 2,
1092 .num_resources = ARRAY_SIZE(wm831x_dcdc2_resources),
1093 .resources = wm831x_dcdc2_resources,
1094 },
1095 {
1096 .name = "wm831x-buckp",
1097 .id = 3,
1098 .num_resources = ARRAY_SIZE(wm831x_dcdc3_resources),
1099 .resources = wm831x_dcdc3_resources,
1100 },
1101 {
1102 .name = "wm831x-boostp",
1103 .id = 4,
1104 .num_resources = ARRAY_SIZE(wm831x_dcdc4_resources),
1105 .resources = wm831x_dcdc4_resources,
1106 },
1107 {
1108 .name = "wm831x-epe",
1109 .id = 1,
1110 },
1111 {
1112 .name = "wm831x-epe",
1113 .id = 2,
1114 },
1115 {
1116 .name = "wm831x-gpio",
1117 .num_resources = ARRAY_SIZE(wm831x_gpio_resources),
1118 .resources = wm831x_gpio_resources,
1119 },
1120 {
1121 .name = "wm831x-hwmon",
1122 },
1123 {
1124 .name = "wm831x-isink",
1125 .id = 1,
1126 .num_resources = ARRAY_SIZE(wm831x_isink1_resources),
1127 .resources = wm831x_isink1_resources,
1128 },
1129 {
1130 .name = "wm831x-isink",
1131 .id = 2,
1132 .num_resources = ARRAY_SIZE(wm831x_isink2_resources),
1133 .resources = wm831x_isink2_resources,
1134 },
1135 {
1136 .name = "wm831x-ldo",
1137 .id = 1,
1138 .num_resources = ARRAY_SIZE(wm831x_ldo1_resources),
1139 .resources = wm831x_ldo1_resources,
1140 },
1141 {
1142 .name = "wm831x-ldo",
1143 .id = 2,
1144 .num_resources = ARRAY_SIZE(wm831x_ldo2_resources),
1145 .resources = wm831x_ldo2_resources,
1146 },
1147 {
1148 .name = "wm831x-ldo",
1149 .id = 3,
1150 .num_resources = ARRAY_SIZE(wm831x_ldo3_resources),
1151 .resources = wm831x_ldo3_resources,
1152 },
1153 {
1154 .name = "wm831x-ldo",
1155 .id = 4,
1156 .num_resources = ARRAY_SIZE(wm831x_ldo4_resources),
1157 .resources = wm831x_ldo4_resources,
1158 },
1159 {
1160 .name = "wm831x-ldo",
1161 .id = 5,
1162 .num_resources = ARRAY_SIZE(wm831x_ldo5_resources),
1163 .resources = wm831x_ldo5_resources,
1164 },
1165 {
1166 .name = "wm831x-ldo",
1167 .id = 6,
1168 .num_resources = ARRAY_SIZE(wm831x_ldo6_resources),
1169 .resources = wm831x_ldo6_resources,
1170 },
1171 {
1172 .name = "wm831x-aldo",
1173 .id = 7,
1174 .num_resources = ARRAY_SIZE(wm831x_ldo7_resources),
1175 .resources = wm831x_ldo7_resources,
1176 },
1177 {
1178 .name = "wm831x-aldo",
1179 .id = 8,
1180 .num_resources = ARRAY_SIZE(wm831x_ldo8_resources),
1181 .resources = wm831x_ldo8_resources,
1182 },
1183 {
1184 .name = "wm831x-aldo",
1185 .id = 9,
1186 .num_resources = ARRAY_SIZE(wm831x_ldo9_resources),
1187 .resources = wm831x_ldo9_resources,
1188 },
1189 {
1190 .name = "wm831x-aldo",
1191 .id = 10,
1192 .num_resources = ARRAY_SIZE(wm831x_ldo10_resources),
1193 .resources = wm831x_ldo10_resources,
1194 },
1195 {
1196 .name = "wm831x-alive-ldo",
1197 .id = 11,
1198 .num_resources = ARRAY_SIZE(wm831x_ldo11_resources),
1199 .resources = wm831x_ldo11_resources,
1200 },
1201 {
1202 .name = "wm831x-on",
1203 .num_resources = ARRAY_SIZE(wm831x_on_resources),
1204 .resources = wm831x_on_resources,
1205 },
1206 {
1207 .name = "wm831x-power",
1208 .num_resources = ARRAY_SIZE(wm831x_power_resources),
1209 .resources = wm831x_power_resources,
1210 },
1211 {
1212 .name = "wm831x-rtc",
1213 .num_resources = ARRAY_SIZE(wm831x_rtc_resources),
1214 .resources = wm831x_rtc_resources,
1215 },
1216 {
1217 .name = "wm831x-status",
1218 .id = 1,
1219 .num_resources = ARRAY_SIZE(wm831x_status1_resources),
1220 .resources = wm831x_status1_resources,
1221 },
1222 {
1223 .name = "wm831x-status",
1224 .id = 2,
1225 .num_resources = ARRAY_SIZE(wm831x_status2_resources),
1226 .resources = wm831x_status2_resources,
1227 },
1228 {
1229 .name = "wm831x-touch",
1230 .num_resources = ARRAY_SIZE(wm831x_touch_resources),
1231 .resources = wm831x_touch_resources,
1232 },
1233 {
1234 .name = "wm831x-watchdog",
1235 .num_resources = ARRAY_SIZE(wm831x_wdt_resources),
1236 .resources = wm831x_wdt_resources,
1237 },
1238 };
1239
1240 static struct mfd_cell backlight_devs[] = {
1241 {
1242 .name = "wm831x-backlight",
1243 },
1244 };
1245
1246 /*
1247 * Instantiate the generic non-control parts of the device.
1248 */
1249 static int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq)
1250 {
1251 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
1252 int rev;
1253 enum wm831x_parent parent;
1254 int ret;
1255
1256 mutex_init(&wm831x->io_lock);
1257 mutex_init(&wm831x->key_lock);
1258 mutex_init(&wm831x->auxadc_lock);
1259 dev_set_drvdata(wm831x->dev, wm831x);
1260
1261 ret = wm831x_reg_read(wm831x, WM831X_PARENT_ID);
1262 if (ret < 0) {
1263 dev_err(wm831x->dev, "Failed to read parent ID: %d\n", ret);
1264 goto err;
1265 }
1266 if (ret != 0x6204) {
1267 dev_err(wm831x->dev, "Device is not a WM831x: ID %x\n", ret);
1268 ret = -EINVAL;
1269 goto err;
1270 }
1271
1272 ret = wm831x_reg_read(wm831x, WM831X_REVISION);
1273 if (ret < 0) {
1274 dev_err(wm831x->dev, "Failed to read revision: %d\n", ret);
1275 goto err;
1276 }
1277 rev = (ret & WM831X_PARENT_REV_MASK) >> WM831X_PARENT_REV_SHIFT;
1278
1279 ret = wm831x_reg_read(wm831x, WM831X_RESET_ID);
1280 if (ret < 0) {
1281 dev_err(wm831x->dev, "Failed to read device ID: %d\n", ret);
1282 goto err;
1283 }
1284
1285 switch (ret) {
1286 case 0x8310:
1287 parent = WM8310;
1288 switch (rev) {
1289 case 0:
1290 dev_info(wm831x->dev, "WM8310 revision %c\n",
1291 'A' + rev);
1292 break;
1293 }
1294 break;
1295
1296 case 0x8311:
1297 parent = WM8311;
1298 switch (rev) {
1299 case 0:
1300 dev_info(wm831x->dev, "WM8311 revision %c\n",
1301 'A' + rev);
1302 break;
1303 }
1304 break;
1305
1306 case 0x8312:
1307 parent = WM8312;
1308 switch (rev) {
1309 case 0:
1310 dev_info(wm831x->dev, "WM8312 revision %c\n",
1311 'A' + rev);
1312 break;
1313 }
1314 break;
1315
1316 case 0:
1317 /* Some engineering samples do not have the ID set,
1318 * rely on the device being registered correctly.
1319 * This will need revisiting for future devices with
1320 * multiple dies.
1321 */
1322 parent = id;
1323 switch (rev) {
1324 case 0:
1325 dev_info(wm831x->dev, "WM831%d ES revision %c\n",
1326 parent, 'A' + rev);
1327 break;
1328 }
1329 break;
1330
1331 default:
1332 dev_err(wm831x->dev, "Unknown WM831x device %04x\n", ret);
1333 ret = -EINVAL;
1334 goto err;
1335 }
1336
1337 /* This will need revisiting in future but is OK for all
1338 * current parts.
1339 */
1340 if (parent != id)
1341 dev_warn(wm831x->dev, "Device was registered as a WM831%lu\n",
1342 id);
1343
1344 /* Bootstrap the user key */
1345 ret = wm831x_reg_read(wm831x, WM831X_SECURITY_KEY);
1346 if (ret < 0) {
1347 dev_err(wm831x->dev, "Failed to read security key: %d\n", ret);
1348 goto err;
1349 }
1350 if (ret != 0) {
1351 dev_warn(wm831x->dev, "Security key had non-zero value %x\n",
1352 ret);
1353 wm831x_reg_write(wm831x, WM831X_SECURITY_KEY, 0);
1354 }
1355 wm831x->locked = 1;
1356
1357 if (pdata && pdata->pre_init) {
1358 ret = pdata->pre_init(wm831x);
1359 if (ret != 0) {
1360 dev_err(wm831x->dev, "pre_init() failed: %d\n", ret);
1361 goto err;
1362 }
1363 }
1364
1365 ret = wm831x_irq_init(wm831x, irq);
1366 if (ret != 0)
1367 goto err;
1368
1369 /* The core device is up, instantiate the subdevices. */
1370 switch (parent) {
1371 case WM8310:
1372 ret = mfd_add_devices(wm831x->dev, -1,
1373 wm8310_devs, ARRAY_SIZE(wm8310_devs),
1374 NULL, 0);
1375 break;
1376
1377 case WM8311:
1378 ret = mfd_add_devices(wm831x->dev, -1,
1379 wm8311_devs, ARRAY_SIZE(wm8311_devs),
1380 NULL, 0);
1381 break;
1382
1383 case WM8312:
1384 ret = mfd_add_devices(wm831x->dev, -1,
1385 wm8312_devs, ARRAY_SIZE(wm8312_devs),
1386 NULL, 0);
1387 break;
1388
1389 default:
1390 /* If this happens the bus probe function is buggy */
1391 BUG();
1392 }
1393
1394 if (ret != 0) {
1395 dev_err(wm831x->dev, "Failed to add children\n");
1396 goto err_irq;
1397 }
1398
1399 if (pdata && pdata->backlight) {
1400 /* Treat errors as non-critical */
1401 ret = mfd_add_devices(wm831x->dev, -1, backlight_devs,
1402 ARRAY_SIZE(backlight_devs), NULL, 0);
1403 if (ret < 0)
1404 dev_err(wm831x->dev, "Failed to add backlight: %d\n",
1405 ret);
1406 }
1407
1408 wm831x_otp_init(wm831x);
1409
1410 if (pdata && pdata->post_init) {
1411 ret = pdata->post_init(wm831x);
1412 if (ret != 0) {
1413 dev_err(wm831x->dev, "post_init() failed: %d\n", ret);
1414 goto err_irq;
1415 }
1416 }
1417
1418 return 0;
1419
1420 err_irq:
1421 wm831x_irq_exit(wm831x);
1422 err:
1423 mfd_remove_devices(wm831x->dev);
1424 kfree(wm831x);
1425 return ret;
1426 }
1427
1428 static void wm831x_device_exit(struct wm831x *wm831x)
1429 {
1430 wm831x_otp_exit(wm831x);
1431 mfd_remove_devices(wm831x->dev);
1432 wm831x_irq_exit(wm831x);
1433 kfree(wm831x);
1434 }
1435
1436 static int wm831x_i2c_read_device(struct wm831x *wm831x, unsigned short reg,
1437 int bytes, void *dest)
1438 {
1439 struct i2c_client *i2c = wm831x->control_data;
1440 int ret;
1441 u16 r = cpu_to_be16(reg);
1442
1443 ret = i2c_master_send(i2c, (unsigned char *)&r, 2);
1444 if (ret < 0)
1445 return ret;
1446 if (ret != 2)
1447 return -EIO;
1448
1449 ret = i2c_master_recv(i2c, dest, bytes);
1450 if (ret < 0)
1451 return ret;
1452 if (ret != bytes)
1453 return -EIO;
1454 return 0;
1455 }
1456
1457 /* Currently we allocate the write buffer on the stack; this is OK for
1458 * small writes - if we need to do large writes this will need to be
1459 * revised.
1460 */
1461 static int wm831x_i2c_write_device(struct wm831x *wm831x, unsigned short reg,
1462 int bytes, void *src)
1463 {
1464 struct i2c_client *i2c = wm831x->control_data;
1465 unsigned char msg[bytes + 2];
1466 int ret;
1467
1468 reg = cpu_to_be16(reg);
1469 memcpy(&msg[0], &reg, 2);
1470 memcpy(&msg[2], src, bytes);
1471
1472 ret = i2c_master_send(i2c, msg, bytes + 2);
1473 if (ret < 0)
1474 return ret;
1475 if (ret < bytes + 2)
1476 return -EIO;
1477
1478 return 0;
1479 }
1480
1481 static int wm831x_i2c_probe(struct i2c_client *i2c,
1482 const struct i2c_device_id *id)
1483 {
1484 struct wm831x *wm831x;
1485
1486 wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL);
1487 if (wm831x == NULL) {
1488 kfree(i2c);
1489 return -ENOMEM;
1490 }
1491
1492 i2c_set_clientdata(i2c, wm831x);
1493 wm831x->dev = &i2c->dev;
1494 wm831x->control_data = i2c;
1495 wm831x->read_dev = wm831x_i2c_read_device;
1496 wm831x->write_dev = wm831x_i2c_write_device;
1497
1498 return wm831x_device_init(wm831x, id->driver_data, i2c->irq);
1499 }
1500
1501 static int wm831x_i2c_remove(struct i2c_client *i2c)
1502 {
1503 struct wm831x *wm831x = i2c_get_clientdata(i2c);
1504
1505 wm831x_device_exit(wm831x);
1506
1507 return 0;
1508 }
1509
1510 static const struct i2c_device_id wm831x_i2c_id[] = {
1511 { "wm8310", WM8310 },
1512 { "wm8311", WM8311 },
1513 { "wm8312", WM8312 },
1514 { }
1515 };
1516 MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id);
1517
1518
1519 static struct i2c_driver wm831x_i2c_driver = {
1520 .driver = {
1521 .name = "wm831x",
1522 .owner = THIS_MODULE,
1523 },
1524 .probe = wm831x_i2c_probe,
1525 .remove = wm831x_i2c_remove,
1526 .id_table = wm831x_i2c_id,
1527 };
1528
1529 static int __init wm831x_i2c_init(void)
1530 {
1531 int ret;
1532
1533 ret = i2c_add_driver(&wm831x_i2c_driver);
1534 if (ret != 0)
1535 pr_err("Failed to register wm831x I2C driver: %d\n", ret);
1536
1537 return ret;
1538 }
1539 subsys_initcall(wm831x_i2c_init);
1540
1541 static void __exit wm831x_i2c_exit(void)
1542 {
1543 i2c_del_driver(&wm831x_i2c_driver);
1544 }
1545 module_exit(wm831x_i2c_exit);
1546
1547 MODULE_DESCRIPTION("I2C support for the WM831X AudioPlus PMIC");
1548 MODULE_LICENSE("GPL");
1549 MODULE_AUTHOR("Mark Brown");
linux-next