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
 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 * wm97xx IO access, all IO locking done by AC97 layer
 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	/* 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}
114EXPORT_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
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	/* 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}
169EXPORT_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
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 * 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
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 * Codec GPIO pin configuration, this sets pin direction, polarity,
229 * stickyness and wake up.
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 * 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 */
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 * Handle a pen down interrupt.
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	/* 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 */
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 * initialise pen IRQ handler and workqueue
376 */
377static 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
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			/* 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
446		if (abs_x[0] > (data.x & 0xfff) ||
447		    abs_x[1] < (data.x & 0xfff) ||
448		    abs_y[0] > (data.y & 0xfff) ||
449		    abs_y[1] < (data.y & 0xfff)) {
450			dev_dbg(wm->dev, "Measurement out of range, dropping it\n");
451			rc = RC_AGAIN;
452			goto out;
453		}
454
455		input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
456		input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
457		input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
458		input_report_key(wm->input_dev, BTN_TOUCH, 1);
459		input_sync(wm->input_dev);
460		wm->pen_is_down = 1;
461		wm->ts_reader_interval = wm->ts_reader_min_interval;
462	} else if (rc & RC_PENDOWN) {
463		dev_dbg(wm->dev, "pen down\n");
464		wm->pen_is_down = 1;
465		wm->ts_reader_interval = wm->ts_reader_min_interval;
466	}
467
468out:
469	mutex_unlock(&wm->codec_mutex);
470	return rc;
471}
472
473/*
474* The touchscreen sample reader.
475*/
476static void wm97xx_ts_reader(struct work_struct *work)
477{
478	int rc;
479	struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work);
480
481	BUG_ON(!wm->codec);
482
483	do {
484		rc = wm97xx_read_samples(wm);
485	} while (rc & RC_AGAIN);
486
487	if (wm->pen_is_down || !wm->pen_irq)
488		queue_delayed_work(wm->ts_workq, &wm->ts_reader,
489				   wm->ts_reader_interval);
490}
491
492/**
493 * wm97xx_ts_input_open - Open the touch screen input device.
494 * @idev:	Input device to be opened.
495 *
496 * Called by the input sub system to open a wm97xx touchscreen device.
497 * Starts the touchscreen thread and touch digitiser.
498 */
499static int wm97xx_ts_input_open(struct input_dev *idev)
500{
501	struct wm97xx *wm = input_get_drvdata(idev);
502
503	wm->ts_workq = create_singlethread_workqueue("kwm97xx");
504	if (wm->ts_workq == NULL) {
505		dev_err(wm->dev,
506			"Failed to create workqueue\n");
507		return -EINVAL;
508	}
509
510	/* start digitiser */
511	if (wm->mach_ops && wm->mach_ops->acc_enabled)
512		wm->codec->acc_enable(wm, 1);
513	wm->codec->dig_enable(wm, 1);
514
515	INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader);
516	INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker);
517
518	wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1;
519	if (wm->ts_reader_min_interval < 1)
520		wm->ts_reader_min_interval = 1;
521	wm->ts_reader_interval = wm->ts_reader_min_interval;
522
523	wm->pen_is_down = 0;
524	if (wm->pen_irq)
525		wm97xx_init_pen_irq(wm);
526	else
527		dev_err(wm->dev, "No IRQ specified\n");
528
529	/* If we either don't have an interrupt for pen down events or
530	 * failed to acquire it then we need to poll.
531	 */
532	if (wm->pen_irq == 0)
533		queue_delayed_work(wm->ts_workq, &wm->ts_reader,
534				   wm->ts_reader_interval);
535
536	return 0;
537}
538
539/**
540 * wm97xx_ts_input_close - Close the touch screen input device.
541 * @idev:	Input device to be closed.
542 *
543 * Called by the input sub system to close a wm97xx touchscreen
544 * device.  Kills the touchscreen thread and stops the touch
545 * digitiser.
546 */
547
548static void wm97xx_ts_input_close(struct input_dev *idev)
549{
550	struct wm97xx *wm = input_get_drvdata(idev);
551	u16 reg;
552
553	if (wm->pen_irq) {
554		/* Return the interrupt to GPIO usage (disabling it) */
555		if (wm->id != WM9705_ID2) {
556			BUG_ON(!wm->mach_ops->irq_gpio);
557			reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
558			wm97xx_reg_write(wm, AC97_MISC_AFE,
559					 reg | wm->mach_ops->irq_gpio);
560		}
561
562		free_irq(wm->pen_irq, wm);
563	}
564
565	wm->pen_is_down = 0;
566
567	/* Balance out interrupt disables/enables */
568	if (cancel_work_sync(&wm->pen_event_work))
569		wm->mach_ops->irq_enable(wm, 1);
570
571	/* ts_reader rearms itself so we need to explicitly stop it
572	 * before we destroy the workqueue.
573	 */
574	cancel_delayed_work_sync(&wm->ts_reader);
575
576	destroy_workqueue(wm->ts_workq);
577
578	/* stop digitiser */
579	wm->codec->dig_enable(wm, 0);
580	if (wm->mach_ops && wm->mach_ops->acc_enabled)
581		wm->codec->acc_enable(wm, 0);
582}
583
584static int wm97xx_probe(struct device *dev)
585{
586	struct wm97xx *wm;
587	struct wm97xx_pdata *pdata = dev_get_platdata(dev);
588	int ret = 0, id = 0;
589
590	wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL);
591	if (!wm)
592		return -ENOMEM;
593	mutex_init(&wm->codec_mutex);
594
595	wm->dev = dev;
596	dev_set_drvdata(dev, wm);
597	wm->ac97 = to_ac97_t(dev);
598
599	/* check that we have a supported codec */
600	id = wm97xx_reg_read(wm, AC97_VENDOR_ID1);
601	if (id != WM97XX_ID1) {
602		dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id);
603		ret = -ENODEV;
604		goto alloc_err;
605	}
606
607	wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2);
608
609	wm->variant = WM97xx_GENERIC;
610
611	dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff);
612
613	switch (wm->id & 0xff) {
614#ifdef CONFIG_TOUCHSCREEN_WM9705
615	case 0x05:
616		wm->codec = &wm9705_codec;
617		break;
618#endif
619#ifdef CONFIG_TOUCHSCREEN_WM9712
620	case 0x12:
621		wm->codec = &wm9712_codec;
622		break;
623#endif
624#ifdef CONFIG_TOUCHSCREEN_WM9713
625	case 0x13:
626		wm->codec = &wm9713_codec;
627		break;
628#endif
629	default:
630		dev_err(wm->dev, "Support for wm97%02x not compiled in.\n",
631			wm->id & 0xff);
632		ret = -ENODEV;
633		goto alloc_err;
634	}
635
636	/* set up physical characteristics */
637	wm->codec->phy_init(wm);
638
639	/* load gpio cache */
640	wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
641	wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
642	wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
643	wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
644	wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
645	wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
646
647	wm->input_dev = input_allocate_device();
648	if (wm->input_dev == NULL) {
649		ret = -ENOMEM;
650		goto alloc_err;
651	}
652
653	/* set up touch configuration */
654	wm->input_dev->name = "wm97xx touchscreen";
655	wm->input_dev->phys = "wm97xx";
656	wm->input_dev->open = wm97xx_ts_input_open;
657	wm->input_dev->close = wm97xx_ts_input_close;
658
659	__set_bit(EV_ABS, wm->input_dev->evbit);
660	__set_bit(EV_KEY, wm->input_dev->evbit);
661	__set_bit(BTN_TOUCH, wm->input_dev->keybit);
662
663	input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1],
664			     abs_x[2], 0);
665	input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1],
666			     abs_y[2], 0);
667	input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1],
668			     abs_p[2], 0);
669
670	input_set_drvdata(wm->input_dev, wm);
671	wm->input_dev->dev.parent = dev;
672
673	ret = input_register_device(wm->input_dev);
674	if (ret < 0)
675		goto dev_alloc_err;
676
677	/* register our battery device */
678	wm->battery_dev = platform_device_alloc("wm97xx-battery", -1);
679	if (!wm->battery_dev) {
680		ret = -ENOMEM;
681		goto batt_err;
682	}
683	platform_set_drvdata(wm->battery_dev, wm);
684	wm->battery_dev->dev.parent = dev;
685	wm->battery_dev->dev.platform_data = pdata;
686	ret = platform_device_add(wm->battery_dev);
687	if (ret < 0)
688		goto batt_reg_err;
689
690	/* register our extended touch device (for machine specific
691	 * extensions) */
692	wm->touch_dev = platform_device_alloc("wm97xx-touch", -1);
693	if (!wm->touch_dev) {
694		ret = -ENOMEM;
695		goto touch_err;
696	}
697	platform_set_drvdata(wm->touch_dev, wm);
698	wm->touch_dev->dev.parent = dev;
699	wm->touch_dev->dev.platform_data = pdata;
700	ret = platform_device_add(wm->touch_dev);
701	if (ret < 0)
702		goto touch_reg_err;
703
704	return ret;
705
706 touch_reg_err:
707	platform_device_put(wm->touch_dev);
708 touch_err:
709	platform_device_del(wm->battery_dev);
710 batt_reg_err:
711	platform_device_put(wm->battery_dev);
712 batt_err:
713	input_unregister_device(wm->input_dev);
714	wm->input_dev = NULL;
715 dev_alloc_err:
716	input_free_device(wm->input_dev);
717 alloc_err:
718	kfree(wm);
719
720	return ret;
721}
722
723static int wm97xx_remove(struct device *dev)
724{
725	struct wm97xx *wm = dev_get_drvdata(dev);
726
727	platform_device_unregister(wm->battery_dev);
728	platform_device_unregister(wm->touch_dev);
729	input_unregister_device(wm->input_dev);
730	kfree(wm);
731
732	return 0;
733}
734
735#ifdef CONFIG_PM
736static int wm97xx_suspend(struct device *dev, pm_message_t state)
737{
738	struct wm97xx *wm = dev_get_drvdata(dev);
739	u16 reg;
740	int suspend_mode;
741
742	if (device_may_wakeup(&wm->input_dev->dev))
743		suspend_mode = wm->suspend_mode;
744	else
745		suspend_mode = 0;
746
747	if (wm->input_dev->users)
748		cancel_delayed_work_sync(&wm->ts_reader);
749
750	/* Power down the digitiser (bypassing the cache for resume) */
751	reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2);
752	reg &= ~WM97XX_PRP_DET_DIG;
753	if (wm->input_dev->users)
754		reg |= suspend_mode;
755	wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg);
756
757	/* WM9713 has an additional power bit - turn it off if there
758	 * are no users or if suspend mode is zero. */
759	if (wm->id == WM9713_ID2 &&
760	    (!wm->input_dev->users || !suspend_mode)) {
761		reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000;
762		wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
763	}
764
765	return 0;
766}
767
768static int wm97xx_resume(struct device *dev)
769{
770	struct wm97xx *wm = dev_get_drvdata(dev);
771
772	/* restore digitiser and gpios */
773	if (wm->id == WM9713_ID2) {
774		wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]);
775		wm97xx_reg_write(wm, 0x5a, wm->misc);
776		if (wm->input_dev->users) {
777			u16 reg;
778			reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff;
779			wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
780		}
781	}
782
783	wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]);
784	wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]);
785
786	wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]);
787	wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]);
788	wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]);
789	wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]);
790	wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]);
791	wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]);
792
793	if (wm->input_dev->users && !wm->pen_irq) {
794		wm->ts_reader_interval = wm->ts_reader_min_interval;
795		queue_delayed_work(wm->ts_workq, &wm->ts_reader,
796				   wm->ts_reader_interval);
797	}
798
799	return 0;
800}
801
802#else
803#define wm97xx_suspend		NULL
804#define wm97xx_resume		NULL
805#endif
806
807/*
808 * Machine specific operations
809 */
810int wm97xx_register_mach_ops(struct wm97xx *wm,
811			     struct wm97xx_mach_ops *mach_ops)
812{
813	mutex_lock(&wm->codec_mutex);
814	if (wm->mach_ops) {
815		mutex_unlock(&wm->codec_mutex);
816		return -EINVAL;
817	}
818	wm->mach_ops = mach_ops;
819	mutex_unlock(&wm->codec_mutex);
820
821	return 0;
822}
823EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops);
824
825void wm97xx_unregister_mach_ops(struct wm97xx *wm)
826{
827	mutex_lock(&wm->codec_mutex);
828	wm->mach_ops = NULL;
829	mutex_unlock(&wm->codec_mutex);
830}
831EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops);
832
833static struct device_driver wm97xx_driver = {
834	.name =		"wm97xx-ts",
835	.bus =		&ac97_bus_type,
836	.owner =	THIS_MODULE,
837	.probe =	wm97xx_probe,
838	.remove =	wm97xx_remove,
839	.suspend =	wm97xx_suspend,
840	.resume =	wm97xx_resume,
841};
842
843static int __init wm97xx_init(void)
844{
845	return driver_register(&wm97xx_driver);
846}
847
848static void __exit wm97xx_exit(void)
849{
850	driver_unregister(&wm97xx_driver);
851}
852
853module_init(wm97xx_init);
854module_exit(wm97xx_exit);
855
856/* Module information */
857MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
858MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
859MODULE_LICENSE("GPL");