Merge branch 'for-rmk' of git://git.marvell.com/orion
[linux-2.6] / 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
52 #define TS_NAME                 "wm97xx"
53 #define WM_CORE_VERSION         "1.00"
54 #define DEFAULT_PRESSURE        0xb0c0
55
56
57 /*
58  * Touchscreen absolute values
59  *
60  * These parameters are used to help the input layer discard out of
61  * range readings and reduce jitter etc.
62  *
63  *   o min, max:- indicate the min and max values your touch screen returns
64  *   o fuzz:- use a higher number to reduce jitter
65  *
66  * The default values correspond to Mainstone II in QVGA mode
67  *
68  * Please read
69  * Documentation/input/input-programming.txt for more details.
70  */
71
72 static int abs_x[3] = {350, 3900, 5};
73 module_param_array(abs_x, int, NULL, 0);
74 MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz");
75
76 static int abs_y[3] = {320, 3750, 40};
77 module_param_array(abs_y, int, NULL, 0);
78 MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz");
79
80 static int abs_p[3] = {0, 150, 4};
81 module_param_array(abs_p, int, NULL, 0);
82 MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz");
83
84 /*
85  * wm97xx IO access, all IO locking done by AC97 layer
86  */
87 int wm97xx_reg_read(struct wm97xx *wm, u16 reg)
88 {
89         if (wm->ac97)
90                 return wm->ac97->bus->ops->read(wm->ac97, reg);
91         else
92                 return -1;
93 }
94 EXPORT_SYMBOL_GPL(wm97xx_reg_read);
95
96 void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val)
97 {
98         /* cache digitiser registers */
99         if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3)
100                 wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val;
101
102         /* cache gpio regs */
103         if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE)
104                 wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val;
105
106         /* wm9713 irq reg */
107         if (reg == 0x5a)
108                 wm->misc = val;
109
110         if (wm->ac97)
111                 wm->ac97->bus->ops->write(wm->ac97, reg, val);
112 }
113 EXPORT_SYMBOL_GPL(wm97xx_reg_write);
114
115 /**
116  * wm97xx_read_aux_adc - Read the aux adc.
117  * @wm: wm97xx device.
118  * @adcsel: codec ADC to be read
119  *
120  * Reads the selected AUX ADC.
121  */
122
123 int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel)
124 {
125         int power_adc = 0, auxval;
126         u16 power = 0;
127
128         /* get codec */
129         mutex_lock(&wm->codec_mutex);
130
131         /* When the touchscreen is not in use, we may have to power up
132          * the AUX ADC before we can use sample the AUX inputs->
133          */
134         if (wm->id == WM9713_ID2 &&
135             (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) {
136                 power_adc = 1;
137                 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff);
138         }
139
140         /* Prepare the codec for AUX reading */
141         wm->codec->aux_prepare(wm);
142
143         /* Turn polling mode on to read AUX ADC */
144         wm->pen_probably_down = 1;
145         wm->codec->poll_sample(wm, adcsel, &auxval);
146
147         if (power_adc)
148                 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000);
149
150         wm->codec->dig_restore(wm);
151
152         wm->pen_probably_down = 0;
153
154         mutex_unlock(&wm->codec_mutex);
155         return auxval & 0xfff;
156 }
157 EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc);
158
159 /**
160  * wm97xx_get_gpio - Get the status of a codec GPIO.
161  * @wm: wm97xx device.
162  * @gpio: gpio
163  *
164  * Get the status of a codec GPIO pin
165  */
166
167 enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio)
168 {
169         u16 status;
170         enum wm97xx_gpio_status ret;
171
172         mutex_lock(&wm->codec_mutex);
173         status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
174
175         if (status & gpio)
176                 ret = WM97XX_GPIO_HIGH;
177         else
178                 ret = WM97XX_GPIO_LOW;
179
180         mutex_unlock(&wm->codec_mutex);
181         return ret;
182 }
183 EXPORT_SYMBOL_GPL(wm97xx_get_gpio);
184
185 /**
186  * wm97xx_set_gpio - Set the status of a codec GPIO.
187  * @wm: wm97xx device.
188  * @gpio: gpio
189  *
190  *
191  * Set the status of a codec GPIO pin
192  */
193
194 void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
195                                 enum wm97xx_gpio_status status)
196 {
197         u16 reg;
198
199         mutex_lock(&wm->codec_mutex);
200         reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
201
202         if (status & WM97XX_GPIO_HIGH)
203                 reg |= gpio;
204         else
205                 reg &= ~gpio;
206
207         if (wm->id == WM9712_ID2)
208                 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1);
209         else
210                 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg);
211         mutex_unlock(&wm->codec_mutex);
212 }
213 EXPORT_SYMBOL_GPL(wm97xx_set_gpio);
214
215 /*
216  * Codec GPIO pin configuration, this sets pin direction, polarity,
217  * stickyness and wake up.
218  */
219 void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir,
220                    enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky,
221                    enum wm97xx_gpio_wake wake)
222 {
223         u16 reg;
224
225         mutex_lock(&wm->codec_mutex);
226         reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
227
228         if (pol == WM97XX_GPIO_POL_HIGH)
229                 reg |= gpio;
230         else
231                 reg &= ~gpio;
232
233         wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg);
234         reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
235
236         if (sticky == WM97XX_GPIO_STICKY)
237                 reg |= gpio;
238         else
239                 reg &= ~gpio;
240
241         wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg);
242         reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
243
244         if (wake == WM97XX_GPIO_WAKE)
245                 reg |= gpio;
246         else
247                 reg &= ~gpio;
248
249         wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg);
250         reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
251
252         if (dir == WM97XX_GPIO_IN)
253                 reg |= gpio;
254         else
255                 reg &= ~gpio;
256
257         wm97xx_reg_write(wm, AC97_GPIO_CFG, reg);
258         mutex_unlock(&wm->codec_mutex);
259 }
260 EXPORT_SYMBOL_GPL(wm97xx_config_gpio);
261
262 /*
263  * Configure the WM97XX_PRP value to use while system is suspended.
264  * If a value other than 0 is set then WM97xx pen detection will be
265  * left enabled in the configured mode while the system is in suspend,
266  * the device has users and suspend has not been disabled via the
267  * wakeup sysfs entries.
268  *
269  * @wm:   WM97xx device to configure
270  * @mode: WM97XX_PRP value to configure while suspended
271  */
272 void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode)
273 {
274         wm->suspend_mode = mode;
275         device_init_wakeup(&wm->input_dev->dev, mode != 0);
276 }
277 EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode);
278
279 /*
280  * Handle a pen down interrupt.
281  */
282 static void wm97xx_pen_irq_worker(struct work_struct *work)
283 {
284         struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work);
285         int pen_was_down = wm->pen_is_down;
286
287         /* do we need to enable the touch panel reader */
288         if (wm->id == WM9705_ID2) {
289                 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) &
290                                         WM97XX_PEN_DOWN)
291                         wm->pen_is_down = 1;
292                 else
293                         wm->pen_is_down = 0;
294         } else {
295                 u16 status, pol;
296                 mutex_lock(&wm->codec_mutex);
297                 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
298                 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
299
300                 if (WM97XX_GPIO_13 & pol & status) {
301                         wm->pen_is_down = 1;
302                         wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol &
303                                                 ~WM97XX_GPIO_13);
304                 } else {
305                         wm->pen_is_down = 0;
306                         wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol |
307                                          WM97XX_GPIO_13);
308                 }
309
310                 if (wm->id == WM9712_ID2)
311                         wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status &
312                                                 ~WM97XX_GPIO_13) << 1);
313                 else
314                         wm97xx_reg_write(wm, AC97_GPIO_STATUS, status &
315                                                 ~WM97XX_GPIO_13);
316                 mutex_unlock(&wm->codec_mutex);
317         }
318
319         /* If the system is not using continuous mode or it provides a
320          * pen down operation then we need to schedule polls while the
321          * pen is down.  Otherwise the machine driver is responsible
322          * for scheduling reads.
323          */
324         if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) {
325                 if (wm->pen_is_down && !pen_was_down) {
326                         /* Data is not availiable immediately on pen down */
327                         queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1);
328                 }
329
330                 /* Let ts_reader report the pen up for debounce. */
331                 if (!wm->pen_is_down && pen_was_down)
332                         wm->pen_is_down = 1;
333         }
334
335         if (!wm->pen_is_down && wm->mach_ops->acc_enabled)
336                 wm->mach_ops->acc_pen_up(wm);
337
338         wm->mach_ops->irq_enable(wm, 1);
339 }
340
341 /*
342  * Codec PENDOWN irq handler
343  *
344  * We have to disable the codec interrupt in the handler because it
345  * can take upto 1ms to clear the interrupt source. We schedule a task
346  * in a work queue to do the actual interaction with the chip.  The
347  * interrupt is then enabled again in the slow handler when the source
348  * has been cleared.
349  */
350 static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
351 {
352         struct wm97xx *wm = dev_id;
353
354         if (!work_pending(&wm->pen_event_work)) {
355                 wm->mach_ops->irq_enable(wm, 0);
356                 queue_work(wm->ts_workq, &wm->pen_event_work);
357         }
358
359         return IRQ_HANDLED;
360 }
361
362 /*
363  * initialise pen IRQ handler and workqueue
364  */
365 static int wm97xx_init_pen_irq(struct wm97xx *wm)
366 {
367         u16 reg;
368
369         /* If an interrupt is supplied an IRQ enable operation must also be
370          * provided. */
371         BUG_ON(!wm->mach_ops->irq_enable);
372
373         if (request_irq(wm->pen_irq, wm97xx_pen_interrupt,
374                         IRQF_SHARED | IRQF_SAMPLE_RANDOM,
375                         "wm97xx-pen", wm)) {
376                 dev_err(wm->dev,
377                         "Failed to register pen down interrupt, polling");
378                 wm->pen_irq = 0;
379                 return -EINVAL;
380         }
381
382         /* Configure GPIO as interrupt source on WM971x */
383         if (wm->id != WM9705_ID2) {
384                 BUG_ON(!wm->mach_ops->irq_gpio);
385                 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
386                 wm97xx_reg_write(wm, AC97_MISC_AFE,
387                                 reg & ~(wm->mach_ops->irq_gpio));
388                 reg = wm97xx_reg_read(wm, 0x5a);
389                 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001);
390         }
391
392         return 0;
393 }
394
395 static int wm97xx_read_samples(struct wm97xx *wm)
396 {
397         struct wm97xx_data data;
398         int rc;
399
400         mutex_lock(&wm->codec_mutex);
401
402         if (wm->mach_ops && wm->mach_ops->acc_enabled)
403                 rc = wm->mach_ops->acc_pen_down(wm);
404         else
405                 rc = wm->codec->poll_touch(wm, &data);
406
407         if (rc & RC_PENUP) {
408                 if (wm->pen_is_down) {
409                         wm->pen_is_down = 0;
410                         dev_dbg(wm->dev, "pen up\n");
411                         input_report_abs(wm->input_dev, ABS_PRESSURE, 0);
412                         input_sync(wm->input_dev);
413                 } else if (!(rc & RC_AGAIN)) {
414                         /* We need high frequency updates only while
415                         * pen is down, the user never will be able to
416                         * touch screen faster than a few times per
417                         * second... On the other hand, when the user
418                         * is actively working with the touchscreen we
419                         * don't want to lose the quick response. So we
420                         * will slowly increase sleep time after the
421                         * pen is up and quicky restore it to ~one task
422                         * switch when pen is down again.
423                         */
424                         if (wm->ts_reader_interval < HZ / 10)
425                                 wm->ts_reader_interval++;
426                 }
427
428         } else if (rc & RC_VALID) {
429                 dev_dbg(wm->dev,
430                         "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",
431                         data.x >> 12, data.x & 0xfff, data.y >> 12,
432                         data.y & 0xfff, data.p >> 12, data.p & 0xfff);
433                 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
434                 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
435                 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
436                 input_sync(wm->input_dev);
437                 wm->pen_is_down = 1;
438                 wm->ts_reader_interval = wm->ts_reader_min_interval;
439         } else if (rc & RC_PENDOWN) {
440                 dev_dbg(wm->dev, "pen down\n");
441                 wm->pen_is_down = 1;
442                 wm->ts_reader_interval = wm->ts_reader_min_interval;
443         }
444
445         mutex_unlock(&wm->codec_mutex);
446         return rc;
447 }
448
449 /*
450 * The touchscreen sample reader.
451 */
452 static void wm97xx_ts_reader(struct work_struct *work)
453 {
454         int rc;
455         struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work);
456
457         BUG_ON(!wm->codec);
458
459         do {
460                 rc = wm97xx_read_samples(wm);
461         } while (rc & RC_AGAIN);
462
463         if (wm->pen_is_down || !wm->pen_irq)
464                 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
465                                    wm->ts_reader_interval);
466 }
467
468 /**
469  * wm97xx_ts_input_open - Open the touch screen input device.
470  * @idev:       Input device to be opened.
471  *
472  * Called by the input sub system to open a wm97xx touchscreen device.
473  * Starts the touchscreen thread and touch digitiser.
474  */
475 static int wm97xx_ts_input_open(struct input_dev *idev)
476 {
477         struct wm97xx *wm = input_get_drvdata(idev);
478
479         wm->ts_workq = create_singlethread_workqueue("kwm97xx");
480         if (wm->ts_workq == NULL) {
481                 dev_err(wm->dev,
482                         "Failed to create workqueue\n");
483                 return -EINVAL;
484         }
485
486         /* start digitiser */
487         if (wm->mach_ops && wm->mach_ops->acc_enabled)
488                 wm->codec->acc_enable(wm, 1);
489         wm->codec->dig_enable(wm, 1);
490
491         INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader);
492         INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker);
493
494         wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1;
495         if (wm->ts_reader_min_interval < 1)
496                 wm->ts_reader_min_interval = 1;
497         wm->ts_reader_interval = wm->ts_reader_min_interval;
498
499         wm->pen_is_down = 0;
500         if (wm->pen_irq)
501                 wm97xx_init_pen_irq(wm);
502         else
503                 dev_err(wm->dev, "No IRQ specified\n");
504
505         /* If we either don't have an interrupt for pen down events or
506          * failed to acquire it then we need to poll.
507          */
508         if (wm->pen_irq == 0)
509                 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
510                                    wm->ts_reader_interval);
511
512         return 0;
513 }
514
515 /**
516  * wm97xx_ts_input_close - Close the touch screen input device.
517  * @idev:       Input device to be closed.
518  *
519  * Called by the input sub system to close a wm97xx touchscreen
520  * device.  Kills the touchscreen thread and stops the touch
521  * digitiser.
522  */
523
524 static void wm97xx_ts_input_close(struct input_dev *idev)
525 {
526         struct wm97xx *wm = input_get_drvdata(idev);
527         u16 reg;
528
529         if (wm->pen_irq) {
530                 /* Return the interrupt to GPIO usage (disabling it) */
531                 if (wm->id != WM9705_ID2) {
532                         BUG_ON(!wm->mach_ops->irq_gpio);
533                         reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
534                         wm97xx_reg_write(wm, AC97_MISC_AFE,
535                                          reg | wm->mach_ops->irq_gpio);
536                 }
537
538                 free_irq(wm->pen_irq, wm);
539         }
540
541         wm->pen_is_down = 0;
542
543         /* Balance out interrupt disables/enables */
544         if (cancel_work_sync(&wm->pen_event_work))
545                 wm->mach_ops->irq_enable(wm, 1);
546
547         /* ts_reader rearms itself so we need to explicitly stop it
548          * before we destroy the workqueue.
549          */
550         cancel_delayed_work_sync(&wm->ts_reader);
551
552         destroy_workqueue(wm->ts_workq);
553
554         /* stop digitiser */
555         wm->codec->dig_enable(wm, 0);
556         if (wm->mach_ops && wm->mach_ops->acc_enabled)
557                 wm->codec->acc_enable(wm, 0);
558 }
559
560 static int wm97xx_probe(struct device *dev)
561 {
562         struct wm97xx *wm;
563         int ret = 0, id = 0;
564
565         wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL);
566         if (!wm)
567                 return -ENOMEM;
568         mutex_init(&wm->codec_mutex);
569
570         wm->dev = dev;
571         dev->driver_data = wm;
572         wm->ac97 = to_ac97_t(dev);
573
574         /* check that we have a supported codec */
575         id = wm97xx_reg_read(wm, AC97_VENDOR_ID1);
576         if (id != WM97XX_ID1) {
577                 dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id);
578                 ret = -ENODEV;
579                 goto alloc_err;
580         }
581
582         wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2);
583
584         dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff);
585
586         switch (wm->id & 0xff) {
587 #ifdef CONFIG_TOUCHSCREEN_WM9705
588         case 0x05:
589                 wm->codec = &wm9705_codec;
590                 break;
591 #endif
592 #ifdef CONFIG_TOUCHSCREEN_WM9712
593         case 0x12:
594                 wm->codec = &wm9712_codec;
595                 break;
596 #endif
597 #ifdef CONFIG_TOUCHSCREEN_WM9713
598         case 0x13:
599                 wm->codec = &wm9713_codec;
600                 break;
601 #endif
602         default:
603                 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n",
604                         wm->id & 0xff);
605                 ret = -ENODEV;
606                 goto alloc_err;
607         }
608
609         /* set up physical characteristics */
610         wm->codec->phy_init(wm);
611
612         /* load gpio cache */
613         wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
614         wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
615         wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
616         wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
617         wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
618         wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
619
620         wm->input_dev = input_allocate_device();
621         if (wm->input_dev == NULL) {
622                 ret = -ENOMEM;
623                 goto alloc_err;
624         }
625
626         /* set up touch configuration */
627         wm->input_dev->name = "wm97xx touchscreen";
628         wm->input_dev->phys = "wm97xx";
629         wm->input_dev->open = wm97xx_ts_input_open;
630         wm->input_dev->close = wm97xx_ts_input_close;
631         set_bit(EV_ABS, wm->input_dev->evbit);
632         set_bit(ABS_X, wm->input_dev->absbit);
633         set_bit(ABS_Y, wm->input_dev->absbit);
634         set_bit(ABS_PRESSURE, wm->input_dev->absbit);
635         input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1],
636                              abs_x[2], 0);
637         input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1],
638                              abs_y[2], 0);
639         input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1],
640                              abs_p[2], 0);
641         input_set_drvdata(wm->input_dev, wm);
642         wm->input_dev->dev.parent = dev;
643         ret = input_register_device(wm->input_dev);
644         if (ret < 0)
645                 goto dev_alloc_err;
646
647         /* register our battery device */
648         wm->battery_dev = platform_device_alloc("wm97xx-battery", -1);
649         if (!wm->battery_dev) {
650                 ret = -ENOMEM;
651                 goto batt_err;
652         }
653         platform_set_drvdata(wm->battery_dev, wm);
654         wm->battery_dev->dev.parent = dev;
655         ret = platform_device_add(wm->battery_dev);
656         if (ret < 0)
657                 goto batt_reg_err;
658
659         /* register our extended touch device (for machine specific
660          * extensions) */
661         wm->touch_dev = platform_device_alloc("wm97xx-touch", -1);
662         if (!wm->touch_dev) {
663                 ret = -ENOMEM;
664                 goto touch_err;
665         }
666         platform_set_drvdata(wm->touch_dev, wm);
667         wm->touch_dev->dev.parent = dev;
668         ret = platform_device_add(wm->touch_dev);
669         if (ret < 0)
670                 goto touch_reg_err;
671
672         return ret;
673
674  touch_reg_err:
675         platform_device_put(wm->touch_dev);
676  touch_err:
677         platform_device_unregister(wm->battery_dev);
678         wm->battery_dev = NULL;
679  batt_reg_err:
680         platform_device_put(wm->battery_dev);
681  batt_err:
682         input_unregister_device(wm->input_dev);
683         wm->input_dev = NULL;
684  dev_alloc_err:
685         input_free_device(wm->input_dev);
686  alloc_err:
687         kfree(wm);
688
689         return ret;
690 }
691
692 static int wm97xx_remove(struct device *dev)
693 {
694         struct wm97xx *wm = dev_get_drvdata(dev);
695
696         platform_device_unregister(wm->battery_dev);
697         platform_device_unregister(wm->touch_dev);
698         input_unregister_device(wm->input_dev);
699         kfree(wm);
700
701         return 0;
702 }
703
704 #ifdef CONFIG_PM
705 static int wm97xx_suspend(struct device *dev, pm_message_t state)
706 {
707         struct wm97xx *wm = dev_get_drvdata(dev);
708         u16 reg;
709         int suspend_mode;
710
711         if (device_may_wakeup(&wm->input_dev->dev))
712                 suspend_mode = wm->suspend_mode;
713         else
714                 suspend_mode = 0;
715
716         if (wm->input_dev->users)
717                 cancel_delayed_work_sync(&wm->ts_reader);
718
719         /* Power down the digitiser (bypassing the cache for resume) */
720         reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2);
721         reg &= ~WM97XX_PRP_DET_DIG;
722         if (wm->input_dev->users)
723                 reg |= suspend_mode;
724         wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg);
725
726         /* WM9713 has an additional power bit - turn it off if there
727          * are no users or if suspend mode is zero. */
728         if (wm->id == WM9713_ID2 &&
729             (!wm->input_dev->users || !suspend_mode)) {
730                 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000;
731                 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
732         }
733
734         return 0;
735 }
736
737 static int wm97xx_resume(struct device *dev)
738 {
739         struct wm97xx *wm = dev_get_drvdata(dev);
740
741         /* restore digitiser and gpios */
742         if (wm->id == WM9713_ID2) {
743                 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]);
744                 wm97xx_reg_write(wm, 0x5a, wm->misc);
745                 if (wm->input_dev->users) {
746                         u16 reg;
747                         reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff;
748                         wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
749                 }
750         }
751
752         wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]);
753         wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]);
754
755         wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]);
756         wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]);
757         wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]);
758         wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]);
759         wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]);
760         wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]);
761
762         if (wm->input_dev->users && !wm->pen_irq) {
763                 wm->ts_reader_interval = wm->ts_reader_min_interval;
764                 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
765                                    wm->ts_reader_interval);
766         }
767
768         return 0;
769 }
770
771 #else
772 #define wm97xx_suspend          NULL
773 #define wm97xx_resume           NULL
774 #endif
775
776 /*
777  * Machine specific operations
778  */
779 int wm97xx_register_mach_ops(struct wm97xx *wm,
780                              struct wm97xx_mach_ops *mach_ops)
781 {
782         mutex_lock(&wm->codec_mutex);
783         if (wm->mach_ops) {
784                 mutex_unlock(&wm->codec_mutex);
785                 return -EINVAL;
786         }
787         wm->mach_ops = mach_ops;
788         mutex_unlock(&wm->codec_mutex);
789
790         return 0;
791 }
792 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops);
793
794 void wm97xx_unregister_mach_ops(struct wm97xx *wm)
795 {
796         mutex_lock(&wm->codec_mutex);
797         wm->mach_ops = NULL;
798         mutex_unlock(&wm->codec_mutex);
799 }
800 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops);
801
802 static struct device_driver wm97xx_driver = {
803         .name =         "wm97xx-ts",
804         .bus =          &ac97_bus_type,
805         .owner =        THIS_MODULE,
806         .probe =        wm97xx_probe,
807         .remove =       wm97xx_remove,
808         .suspend =      wm97xx_suspend,
809         .resume =       wm97xx_resume,
810 };
811
812 static int __init wm97xx_init(void)
813 {
814         return driver_register(&wm97xx_driver);
815 }
816
817 static void __exit wm97xx_exit(void)
818 {
819         driver_unregister(&wm97xx_driver);
820 }
821
822 module_init(wm97xx_init);
823 module_exit(wm97xx_exit);
824
825 /* Module information */
826 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
827 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
828 MODULE_LICENSE("GPL");