Fix common misspellings
[linux-2.6.git] / drivers / input / touchscreen / wm97xx-core.c
1 /*
2  * wm97xx-core.c  --  Touch screen driver core for Wolfson WM9705, WM9712
3  *                    and WM9713 AC97 Codecs.
4  *
5  * Copyright 2003, 2004, 2005, 2006, 2007, 2008 Wolfson Microelectronics PLC.
6  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
7  * Parts Copyright : Ian Molton <spyro@f2s.com>
8  *                   Andrew Zabolotny <zap@homelink.ru>
9  *                   Russell King <rmk@arm.linux.org.uk>
10  *
11  *  This program is free software; you can redistribute  it and/or modify it
12  *  under  the terms of  the GNU General  Public License as published by the
13  *  Free Software Foundation;  either version 2 of the  License, or (at your
14  *  option) any later version.
15  *
16  * Notes:
17  *
18  *  Features:
19  *       - supports WM9705, WM9712, WM9713
20  *       - polling mode
21  *       - continuous mode (arch-dependent)
22  *       - adjustable rpu/dpp settings
23  *       - adjustable pressure current
24  *       - adjustable sample settle delay
25  *       - 4 and 5 wire touchscreens (5 wire is WM9712 only)
26  *       - pen down detection
27  *       - battery monitor
28  *       - sample AUX adcs
29  *       - power management
30  *       - codec GPIO
31  *       - codec event notification
32  * Todo
33  *       - Support for async sampling control for noisy LCDs.
34  *
35  */
36
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  * Touchscreen absolute values
60  *
61  * These parameters are used to help the input layer discard out of
62  * range readings and reduce jitter etc.
63  *
64  *   o min, max:- indicate the min and max values your touch screen returns
65  *   o fuzz:- use a higher number to reduce jitter
66  *
67  * The default values correspond to Mainstone II in QVGA mode
68  *
69  * Please read
70  * Documentation/input/input-programming.txt for more details.
71  */
72
73 static int abs_x[3] = {350, 3900, 5};
74 module_param_array(abs_x, int, NULL, 0);
75 MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz");
76
77 static int abs_y[3] = {320, 3750, 40};
78 module_param_array(abs_y, int, NULL, 0);
79 MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz");
80
81 static int abs_p[3] = {0, 150, 4};
82 module_param_array(abs_p, int, NULL, 0);
83 MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz");
84
85 /*
86  * wm97xx IO access, all IO locking done by AC97 layer
87  */
88 int 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 }
95 EXPORT_SYMBOL_GPL(wm97xx_reg_read);
96
97 void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val)
98 {
99         /* cache digitiser registers */
100         if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3)
101                 wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val;
102
103         /* cache gpio regs */
104         if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE)
105                 wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val;
106
107         /* wm9713 irq reg */
108         if (reg == 0x5a)
109                 wm->misc = val;
110
111         if (wm->ac97)
112                 wm->ac97->bus->ops->write(wm->ac97, reg, val);
113 }
114 EXPORT_SYMBOL_GPL(wm97xx_reg_write);
115
116 /**
117  * wm97xx_read_aux_adc - Read the aux adc.
118  * @wm: wm97xx device.
119  * @adcsel: codec ADC to be read
120  *
121  * Reads the selected AUX ADC.
122  */
123
124 int 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         /* get codec */
132         mutex_lock(&wm->codec_mutex);
133
134         /* When the touchscreen is not in use, we may have to power up
135          * the AUX ADC before we can use sample the AUX inputs->
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         /* Prepare the codec for AUX reading */
144         wm->codec->aux_prepare(wm);
145
146         /* Turn polling mode on to read AUX ADC */
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 }
169 EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc);
170
171 /**
172  * wm97xx_get_gpio - Get the status of a codec GPIO.
173  * @wm: wm97xx device.
174  * @gpio: gpio
175  *
176  * Get the status of a codec GPIO pin
177  */
178
179 enum 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 }
195 EXPORT_SYMBOL_GPL(wm97xx_get_gpio);
196
197 /**
198  * wm97xx_set_gpio - Set the status of a codec GPIO.
199  * @wm: wm97xx device.
200  * @gpio: gpio
201  *
202  *
203  * Set the status of a codec GPIO pin
204  */
205
206 void 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 }
225 EXPORT_SYMBOL_GPL(wm97xx_set_gpio);
226
227 /*
228  * Codec GPIO pin configuration, this sets pin direction, polarity,
229  * stickyness and wake up.
230  */
231 void 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 }
272 EXPORT_SYMBOL_GPL(wm97xx_config_gpio);
273
274 /*
275  * Configure the WM97XX_PRP value to use while system is suspended.
276  * If a value other than 0 is set then WM97xx pen detection will be
277  * left enabled in the configured mode while the system is in suspend,
278  * the device has users and suspend has not been disabled via the
279  * wakeup sysfs entries.
280  *
281  * @wm:   WM97xx device to configure
282  * @mode: WM97XX_PRP value to configure while suspended
283  */
284 void 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 }
289 EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode);
290
291 /*
292  * Handle a pen down interrupt.
293  */
294 static 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         /* do we need to enable the touch panel reader */
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         /* If the system is not using continuous mode or it provides a
332          * pen down operation then we need to schedule polls while the
333          * pen is down.  Otherwise the machine driver is responsible
334          * for scheduling reads.
335          */
336         if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) {
337                 if (wm->pen_is_down && !pen_was_down) {
338                         /* Data is not available immediately on pen down */
339                         queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1);
340                 }
341
342                 /* Let ts_reader report the pen up for debounce. */
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  * Codec PENDOWN irq handler
355  *
356  * We have to disable the codec interrupt in the handler because it
357  * can take up to 1ms to clear the interrupt source. We schedule a task
358  * in a work queue to do the actual interaction with the chip.  The
359  * interrupt is then enabled again in the slow handler when the source
360  * has been cleared.
361  */
362 static 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  * initialise pen IRQ handler and workqueue
376  */
377 static int wm97xx_init_pen_irq(struct wm97xx *wm)
378 {
379         u16 reg;
380
381         /* If an interrupt is supplied an IRQ enable operation must also be
382          * provided. */
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         /* Configure GPIO as interrupt source on WM971x */
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
406 static 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                         /* We need high frequency updates only while
427                         * pen is down, the user never will be able to
428                         * touch screen faster than a few times per
429                         * second... On the other hand, when the user
430                         * is actively working with the touchscreen we
431                         * don't want to lose the quick response. So we
432                         * will slowly increase sleep time after the
433                         * pen is up and quicky restore it to ~one task
434                         * switch when pen is down again.
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 * The touchscreen sample reader.
464 */
465 static 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  * wm97xx_ts_input_open - Open the touch screen input device.
483  * @idev:       Input device to be opened.
484  *
485  * Called by the input sub system to open a wm97xx touchscreen device.
486  * Starts the touchscreen thread and touch digitiser.
487  */
488 static 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         /* start digitiser */
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         /* If we either don't have an interrupt for pen down events or
519          * failed to acquire it then we need to poll.
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  * wm97xx_ts_input_close - Close the touch screen input device.
530  * @idev:       Input device to be closed.
531  *
532  * Called by the input sub system to close a wm97xx touchscreen
533  * device.  Kills the touchscreen thread and stops the touch
534  * digitiser.
535  */
536
537 static 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                 /* Return the interrupt to GPIO usage (disabling it) */
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         /* Balance out interrupt disables/enables */
557         if (cancel_work_sync(&wm->pen_event_work))
558                 wm->mach_ops->irq_enable(wm, 1);
559
560         /* ts_reader rearms itself so we need to explicitly stop it
561          * before we destroy the workqueue.
562          */
563         cancel_delayed_work_sync(&wm->ts_reader);
564
565         destroy_workqueue(wm->ts_workq);
566
567         /* stop digitiser */
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
573 static 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         /* check that we have a supported codec */
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         /* set up physical characteristics */
626         wm->codec->phy_init(wm);
627
628         /* load gpio cache */
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         /* set up touch configuration */
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         /* register our battery device */
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         /* register our extended touch device (for machine specific
680          * extensions) */
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
712 static 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
725 static 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         /* Power down the digitiser (bypassing the cache for resume) */
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         /* WM9713 has an additional power bit - turn it off if there
747          * are no users or if suspend mode is zero. */
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
757 static int wm97xx_resume(struct device *dev)
758 {
759         struct wm97xx *wm = dev_get_drvdata(dev);
760
761         /* restore digitiser and gpios */
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  * Machine specific operations
798  */
799 int 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 }
812 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops);
813
814 void 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 }
820 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops);
821
822 static 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
832 static int __init wm97xx_init(void)
833 {
834         return driver_register(&wm97xx_driver);
835 }
836
837 static void __exit wm97xx_exit(void)
838 {
839         driver_unregister(&wm97xx_driver);
840 }
841
842 module_init(wm97xx_init);
843 module_exit(wm97xx_exit);
844
845 /* Module information */
846 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
847 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
848 MODULE_LICENSE("GPL");