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37#include <linux/module.h>
38#include <linux/moduleparam.h>
39#include <linux/kernel.h>
40#include <linux/init.h>
41#include <linux/delay.h>
42#include <linux/string.h>
43#include <linux/proc_fs.h>
44#include <linux/pm.h>
45#include <linux/interrupt.h>
46#include <linux/bitops.h>
47#include <linux/workqueue.h>
48#include <linux/wm97xx.h>
49#include <linux/uaccess.h>
50#include <linux/io.h>
51#include <linux/slab.h>
52
53#define TS_NAME "wm97xx"
54#define WM_CORE_VERSION "1.00"
55#define DEFAULT_PRESSURE 0xb0c0
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73static int abs_x[3] = {350, 3900, 5};
74module_param_array(abs_x, int, NULL, 0);
75MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz");
76
77static int abs_y[3] = {320, 3750, 40};
78module_param_array(abs_y, int, NULL, 0);
79MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz");
80
81static int abs_p[3] = {0, 150, 4};
82module_param_array(abs_p, int, NULL, 0);
83MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz");
84
85
86
87
88int wm97xx_reg_read(struct wm97xx *wm, u16 reg)
89{
90 if (wm->ac97)
91 return wm->ac97->bus->ops->read(wm->ac97, reg);
92 else
93 return -1;
94}
95EXPORT_SYMBOL_GPL(wm97xx_reg_read);
96
97void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val)
98{
99
100 if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3)
101 wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val;
102
103
104 if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE)
105 wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val;
106
107
108 if (reg == 0x5a)
109 wm->misc = val;
110
111 if (wm->ac97)
112 wm->ac97->bus->ops->write(wm->ac97, reg, val);
113}
114EXPORT_SYMBOL_GPL(wm97xx_reg_write);
115
116
117
118
119
120
121
122
123
124int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel)
125{
126 int power_adc = 0, auxval;
127 u16 power = 0;
128 int rc = 0;
129 int timeout = 0;
130
131
132 mutex_lock(&wm->codec_mutex);
133
134
135
136
137 if (wm->id == WM9713_ID2 &&
138 (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) {
139 power_adc = 1;
140 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff);
141 }
142
143
144 wm->codec->aux_prepare(wm);
145
146
147 wm->pen_probably_down = 1;
148
149 while (rc != RC_VALID && timeout++ < 5)
150 rc = wm->codec->poll_sample(wm, adcsel, &auxval);
151
152 if (power_adc)
153 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000);
154
155 wm->codec->dig_restore(wm);
156
157 wm->pen_probably_down = 0;
158
159 if (timeout >= 5) {
160 dev_err(wm->dev,
161 "timeout reading auxadc %d, disabling digitiser\n",
162 adcsel);
163 wm->codec->dig_enable(wm, false);
164 }
165
166 mutex_unlock(&wm->codec_mutex);
167 return (rc == RC_VALID ? auxval & 0xfff : -EBUSY);
168}
169EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc);
170
171
172
173
174
175
176
177
178
179enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio)
180{
181 u16 status;
182 enum wm97xx_gpio_status ret;
183
184 mutex_lock(&wm->codec_mutex);
185 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
186
187 if (status & gpio)
188 ret = WM97XX_GPIO_HIGH;
189 else
190 ret = WM97XX_GPIO_LOW;
191
192 mutex_unlock(&wm->codec_mutex);
193 return ret;
194}
195EXPORT_SYMBOL_GPL(wm97xx_get_gpio);
196
197
198
199
200
201
202
203
204
205
206void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
207 enum wm97xx_gpio_status status)
208{
209 u16 reg;
210
211 mutex_lock(&wm->codec_mutex);
212 reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
213
214 if (status == WM97XX_GPIO_HIGH)
215 reg |= gpio;
216 else
217 reg &= ~gpio;
218
219 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
220 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1);
221 else
222 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg);
223 mutex_unlock(&wm->codec_mutex);
224}
225EXPORT_SYMBOL_GPL(wm97xx_set_gpio);
226
227
228
229
230
231void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir,
232 enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky,
233 enum wm97xx_gpio_wake wake)
234{
235 u16 reg;
236
237 mutex_lock(&wm->codec_mutex);
238 reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
239
240 if (pol == WM97XX_GPIO_POL_HIGH)
241 reg |= gpio;
242 else
243 reg &= ~gpio;
244
245 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg);
246 reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
247
248 if (sticky == WM97XX_GPIO_STICKY)
249 reg |= gpio;
250 else
251 reg &= ~gpio;
252
253 wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg);
254 reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
255
256 if (wake == WM97XX_GPIO_WAKE)
257 reg |= gpio;
258 else
259 reg &= ~gpio;
260
261 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg);
262 reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
263
264 if (dir == WM97XX_GPIO_IN)
265 reg |= gpio;
266 else
267 reg &= ~gpio;
268
269 wm97xx_reg_write(wm, AC97_GPIO_CFG, reg);
270 mutex_unlock(&wm->codec_mutex);
271}
272EXPORT_SYMBOL_GPL(wm97xx_config_gpio);
273
274
275
276
277
278
279
280
281
282
283
284void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode)
285{
286 wm->suspend_mode = mode;
287 device_init_wakeup(&wm->input_dev->dev, mode != 0);
288}
289EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode);
290
291
292
293
294static void wm97xx_pen_irq_worker(struct work_struct *work)
295{
296 struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work);
297 int pen_was_down = wm->pen_is_down;
298
299
300 if (wm->id == WM9705_ID2) {
301 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) &
302 WM97XX_PEN_DOWN)
303 wm->pen_is_down = 1;
304 else
305 wm->pen_is_down = 0;
306 } else {
307 u16 status, pol;
308 mutex_lock(&wm->codec_mutex);
309 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
310 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
311
312 if (WM97XX_GPIO_13 & pol & status) {
313 wm->pen_is_down = 1;
314 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol &
315 ~WM97XX_GPIO_13);
316 } else {
317 wm->pen_is_down = 0;
318 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol |
319 WM97XX_GPIO_13);
320 }
321
322 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
323 wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status &
324 ~WM97XX_GPIO_13) << 1);
325 else
326 wm97xx_reg_write(wm, AC97_GPIO_STATUS, status &
327 ~WM97XX_GPIO_13);
328 mutex_unlock(&wm->codec_mutex);
329 }
330
331
332
333
334
335
336 if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) {
337 if (wm->pen_is_down && !pen_was_down) {
338
339 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1);
340 }
341
342
343 if (!wm->pen_is_down && pen_was_down)
344 wm->pen_is_down = 1;
345 }
346
347 if (!wm->pen_is_down && wm->mach_ops->acc_enabled)
348 wm->mach_ops->acc_pen_up(wm);
349
350 wm->mach_ops->irq_enable(wm, 1);
351}
352
353
354
355
356
357
358
359
360
361
362static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
363{
364 struct wm97xx *wm = dev_id;
365
366 if (!work_pending(&wm->pen_event_work)) {
367 wm->mach_ops->irq_enable(wm, 0);
368 queue_work(wm->ts_workq, &wm->pen_event_work);
369 }
370
371 return IRQ_HANDLED;
372}
373
374
375
376
377static int wm97xx_init_pen_irq(struct wm97xx *wm)
378{
379 u16 reg;
380
381
382
383 BUG_ON(!wm->mach_ops->irq_enable);
384
385 if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED,
386 "wm97xx-pen", wm)) {
387 dev_err(wm->dev,
388 "Failed to register pen down interrupt, polling");
389 wm->pen_irq = 0;
390 return -EINVAL;
391 }
392
393
394 if (wm->id != WM9705_ID2) {
395 BUG_ON(!wm->mach_ops->irq_gpio);
396 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
397 wm97xx_reg_write(wm, AC97_MISC_AFE,
398 reg & ~(wm->mach_ops->irq_gpio));
399 reg = wm97xx_reg_read(wm, 0x5a);
400 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001);
401 }
402
403 return 0;
404}
405
406static int wm97xx_read_samples(struct wm97xx *wm)
407{
408 struct wm97xx_data data;
409 int rc;
410
411 mutex_lock(&wm->codec_mutex);
412
413 if (wm->mach_ops && wm->mach_ops->acc_enabled)
414 rc = wm->mach_ops->acc_pen_down(wm);
415 else
416 rc = wm->codec->poll_touch(wm, &data);
417
418 if (rc & RC_PENUP) {
419 if (wm->pen_is_down) {
420 wm->pen_is_down = 0;
421 dev_dbg(wm->dev, "pen up\n");
422 input_report_abs(wm->input_dev, ABS_PRESSURE, 0);
423 input_report_key(wm->input_dev, BTN_TOUCH, 0);
424 input_sync(wm->input_dev);
425 } else if (!(rc & RC_AGAIN)) {
426
427
428
429
430
431
432
433
434
435
436 if (wm->ts_reader_interval < HZ / 10)
437 wm->ts_reader_interval++;
438 }
439
440 } else if (rc & RC_VALID) {
441 dev_dbg(wm->dev,
442 "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",
443 data.x >> 12, data.x & 0xfff, data.y >> 12,
444 data.y & 0xfff, data.p >> 12, data.p & 0xfff);
445 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
446 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
447 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
448 input_report_key(wm->input_dev, BTN_TOUCH, 1);
449 input_sync(wm->input_dev);
450 wm->pen_is_down = 1;
451 wm->ts_reader_interval = wm->ts_reader_min_interval;
452 } else if (rc & RC_PENDOWN) {
453 dev_dbg(wm->dev, "pen down\n");
454 wm->pen_is_down = 1;
455 wm->ts_reader_interval = wm->ts_reader_min_interval;
456 }
457
458 mutex_unlock(&wm->codec_mutex);
459 return rc;
460}
461
462
463
464
465static void wm97xx_ts_reader(struct work_struct *work)
466{
467 int rc;
468 struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work);
469
470 BUG_ON(!wm->codec);
471
472 do {
473 rc = wm97xx_read_samples(wm);
474 } while (rc & RC_AGAIN);
475
476 if (wm->pen_is_down || !wm->pen_irq)
477 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
478 wm->ts_reader_interval);
479}
480
481
482
483
484
485
486
487
488static int wm97xx_ts_input_open(struct input_dev *idev)
489{
490 struct wm97xx *wm = input_get_drvdata(idev);
491
492 wm->ts_workq = create_singlethread_workqueue("kwm97xx");
493 if (wm->ts_workq == NULL) {
494 dev_err(wm->dev,
495 "Failed to create workqueue\n");
496 return -EINVAL;
497 }
498
499
500 if (wm->mach_ops && wm->mach_ops->acc_enabled)
501 wm->codec->acc_enable(wm, 1);
502 wm->codec->dig_enable(wm, 1);
503
504 INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader);
505 INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker);
506
507 wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1;
508 if (wm->ts_reader_min_interval < 1)
509 wm->ts_reader_min_interval = 1;
510 wm->ts_reader_interval = wm->ts_reader_min_interval;
511
512 wm->pen_is_down = 0;
513 if (wm->pen_irq)
514 wm97xx_init_pen_irq(wm);
515 else
516 dev_err(wm->dev, "No IRQ specified\n");
517
518
519
520
521 if (wm->pen_irq == 0)
522 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
523 wm->ts_reader_interval);
524
525 return 0;
526}
527
528
529
530
531
532
533
534
535
536
537static void wm97xx_ts_input_close(struct input_dev *idev)
538{
539 struct wm97xx *wm = input_get_drvdata(idev);
540 u16 reg;
541
542 if (wm->pen_irq) {
543
544 if (wm->id != WM9705_ID2) {
545 BUG_ON(!wm->mach_ops->irq_gpio);
546 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
547 wm97xx_reg_write(wm, AC97_MISC_AFE,
548 reg | wm->mach_ops->irq_gpio);
549 }
550
551 free_irq(wm->pen_irq, wm);
552 }
553
554 wm->pen_is_down = 0;
555
556
557 if (cancel_work_sync(&wm->pen_event_work))
558 wm->mach_ops->irq_enable(wm, 1);
559
560
561
562
563 cancel_delayed_work_sync(&wm->ts_reader);
564
565 destroy_workqueue(wm->ts_workq);
566
567
568 wm->codec->dig_enable(wm, 0);
569 if (wm->mach_ops && wm->mach_ops->acc_enabled)
570 wm->codec->acc_enable(wm, 0);
571}
572
573static int wm97xx_probe(struct device *dev)
574{
575 struct wm97xx *wm;
576 struct wm97xx_pdata *pdata = dev->platform_data;
577 int ret = 0, id = 0;
578
579 wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL);
580 if (!wm)
581 return -ENOMEM;
582 mutex_init(&wm->codec_mutex);
583
584 wm->dev = dev;
585 dev_set_drvdata(dev, wm);
586 wm->ac97 = to_ac97_t(dev);
587
588
589 id = wm97xx_reg_read(wm, AC97_VENDOR_ID1);
590 if (id != WM97XX_ID1) {
591 dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id);
592 ret = -ENODEV;
593 goto alloc_err;
594 }
595
596 wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2);
597
598 wm->variant = WM97xx_GENERIC;
599
600 dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff);
601
602 switch (wm->id & 0xff) {
603#ifdef CONFIG_TOUCHSCREEN_WM9705
604 case 0x05:
605 wm->codec = &wm9705_codec;
606 break;
607#endif
608#ifdef CONFIG_TOUCHSCREEN_WM9712
609 case 0x12:
610 wm->codec = &wm9712_codec;
611 break;
612#endif
613#ifdef CONFIG_TOUCHSCREEN_WM9713
614 case 0x13:
615 wm->codec = &wm9713_codec;
616 break;
617#endif
618 default:
619 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n",
620 wm->id & 0xff);
621 ret = -ENODEV;
622 goto alloc_err;
623 }
624
625
626 wm->codec->phy_init(wm);
627
628
629 wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
630 wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
631 wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
632 wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
633 wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
634 wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
635
636 wm->input_dev = input_allocate_device();
637 if (wm->input_dev == NULL) {
638 ret = -ENOMEM;
639 goto alloc_err;
640 }
641
642
643 wm->input_dev->name = "wm97xx touchscreen";
644 wm->input_dev->phys = "wm97xx";
645 wm->input_dev->open = wm97xx_ts_input_open;
646 wm->input_dev->close = wm97xx_ts_input_close;
647
648 __set_bit(EV_ABS, wm->input_dev->evbit);
649 __set_bit(EV_KEY, wm->input_dev->evbit);
650 __set_bit(BTN_TOUCH, wm->input_dev->keybit);
651
652 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1],
653 abs_x[2], 0);
654 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1],
655 abs_y[2], 0);
656 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1],
657 abs_p[2], 0);
658
659 input_set_drvdata(wm->input_dev, wm);
660 wm->input_dev->dev.parent = dev;
661
662 ret = input_register_device(wm->input_dev);
663 if (ret < 0)
664 goto dev_alloc_err;
665
666
667 wm->battery_dev = platform_device_alloc("wm97xx-battery", -1);
668 if (!wm->battery_dev) {
669 ret = -ENOMEM;
670 goto batt_err;
671 }
672 platform_set_drvdata(wm->battery_dev, wm);
673 wm->battery_dev->dev.parent = dev;
674 wm->battery_dev->dev.platform_data = pdata;
675 ret = platform_device_add(wm->battery_dev);
676 if (ret < 0)
677 goto batt_reg_err;
678
679
680
681 wm->touch_dev = platform_device_alloc("wm97xx-touch", -1);
682 if (!wm->touch_dev) {
683 ret = -ENOMEM;
684 goto touch_err;
685 }
686 platform_set_drvdata(wm->touch_dev, wm);
687 wm->touch_dev->dev.parent = dev;
688 wm->touch_dev->dev.platform_data = pdata;
689 ret = platform_device_add(wm->touch_dev);
690 if (ret < 0)
691 goto touch_reg_err;
692
693 return ret;
694
695 touch_reg_err:
696 platform_device_put(wm->touch_dev);
697 touch_err:
698 platform_device_del(wm->battery_dev);
699 batt_reg_err:
700 platform_device_put(wm->battery_dev);
701 batt_err:
702 input_unregister_device(wm->input_dev);
703 wm->input_dev = NULL;
704 dev_alloc_err:
705 input_free_device(wm->input_dev);
706 alloc_err:
707 kfree(wm);
708
709 return ret;
710}
711
712static int wm97xx_remove(struct device *dev)
713{
714 struct wm97xx *wm = dev_get_drvdata(dev);
715
716 platform_device_unregister(wm->battery_dev);
717 platform_device_unregister(wm->touch_dev);
718 input_unregister_device(wm->input_dev);
719 kfree(wm);
720
721 return 0;
722}
723
724#ifdef CONFIG_PM
725static int wm97xx_suspend(struct device *dev, pm_message_t state)
726{
727 struct wm97xx *wm = dev_get_drvdata(dev);
728 u16 reg;
729 int suspend_mode;
730
731 if (device_may_wakeup(&wm->input_dev->dev))
732 suspend_mode = wm->suspend_mode;
733 else
734 suspend_mode = 0;
735
736 if (wm->input_dev->users)
737 cancel_delayed_work_sync(&wm->ts_reader);
738
739
740 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2);
741 reg &= ~WM97XX_PRP_DET_DIG;
742 if (wm->input_dev->users)
743 reg |= suspend_mode;
744 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg);
745
746
747
748 if (wm->id == WM9713_ID2 &&
749 (!wm->input_dev->users || !suspend_mode)) {
750 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000;
751 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
752 }
753
754 return 0;
755}
756
757static int wm97xx_resume(struct device *dev)
758{
759 struct wm97xx *wm = dev_get_drvdata(dev);
760
761
762 if (wm->id == WM9713_ID2) {
763 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]);
764 wm97xx_reg_write(wm, 0x5a, wm->misc);
765 if (wm->input_dev->users) {
766 u16 reg;
767 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff;
768 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
769 }
770 }
771
772 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]);
773 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]);
774
775 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]);
776 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]);
777 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]);
778 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]);
779 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]);
780 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]);
781
782 if (wm->input_dev->users && !wm->pen_irq) {
783 wm->ts_reader_interval = wm->ts_reader_min_interval;
784 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
785 wm->ts_reader_interval);
786 }
787
788 return 0;
789}
790
791#else
792#define wm97xx_suspend NULL
793#define wm97xx_resume NULL
794#endif
795
796
797
798
799int wm97xx_register_mach_ops(struct wm97xx *wm,
800 struct wm97xx_mach_ops *mach_ops)
801{
802 mutex_lock(&wm->codec_mutex);
803 if (wm->mach_ops) {
804 mutex_unlock(&wm->codec_mutex);
805 return -EINVAL;
806 }
807 wm->mach_ops = mach_ops;
808 mutex_unlock(&wm->codec_mutex);
809
810 return 0;
811}
812EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops);
813
814void wm97xx_unregister_mach_ops(struct wm97xx *wm)
815{
816 mutex_lock(&wm->codec_mutex);
817 wm->mach_ops = NULL;
818 mutex_unlock(&wm->codec_mutex);
819}
820EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops);
821
822static struct device_driver wm97xx_driver = {
823 .name = "wm97xx-ts",
824 .bus = &ac97_bus_type,
825 .owner = THIS_MODULE,
826 .probe = wm97xx_probe,
827 .remove = wm97xx_remove,
828 .suspend = wm97xx_suspend,
829 .resume = wm97xx_resume,
830};
831
832static int __init wm97xx_init(void)
833{
834 return driver_register(&wm97xx_driver);
835}
836
837static void __exit wm97xx_exit(void)
838{
839 driver_unregister(&wm97xx_driver);
840}
841
842module_init(wm97xx_init);
843module_exit(wm97xx_exit);
844
845
846MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
847MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
848MODULE_LICENSE("GPL");
849