[linux-block.git] / drivers / input / touchscreen / mainstone-wm97xx.c

/*
 * mainstone-wm97xx.c  --  Mainstone Continuous Touch screen driver for
 *                         Wolfson WM97xx AC97 Codecs.
 *
 * Copyright 2004, 2007 Wolfson Microelectronics PLC.
 * Author: Liam Girdwood
 *         liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
 * Parts Copyright : Ian Molton <spyro@f2s.com>
 *                   Andrew Zabolotny <zap@homelink.ru>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 * Notes:
 *     This is a wm97xx extended touch driver to capture touch
 *     data in a continuous manner on the Intel XScale archictecture
 *
 *  Features:
 *       - codecs supported:- WM9705, WM9712, WM9713
 *       - processors supported:- Intel XScale PXA25x, PXA26x, PXA27x
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/wm97xx.h>
#include <linux/io.h>
#include <mach/pxa-regs.h>

#define VERSION		"0.13"

struct continuous {
	u16 id;    /* codec id */
	u8 code;   /* continuous code */
	u8 reads;  /* number of coord reads per read cycle */
	u32 speed; /* number of coords per second */
};

#define WM_READS(sp) ((sp / HZ) + 1)

static const struct continuous cinfo[] = {
	{WM9705_ID2, 0, WM_READS(94), 94},
	{WM9705_ID2, 1, WM_READS(188), 188},
	{WM9705_ID2, 2, WM_READS(375), 375},
	{WM9705_ID2, 3, WM_READS(750), 750},
	{WM9712_ID2, 0, WM_READS(94), 94},
	{WM9712_ID2, 1, WM_READS(188), 188},
	{WM9712_ID2, 2, WM_READS(375), 375},
	{WM9712_ID2, 3, WM_READS(750), 750},
	{WM9713_ID2, 0, WM_READS(94), 94},
	{WM9713_ID2, 1, WM_READS(120), 120},
	{WM9713_ID2, 2, WM_READS(154), 154},
	{WM9713_ID2, 3, WM_READS(188), 188},
};

/* continuous speed index */
static int sp_idx;
static u16 last, tries;

/*
 * Pen sampling frequency (Hz) in continuous mode.
 */
static int cont_rate = 200;
module_param(cont_rate, int, 0);
MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)");

/*
 * Pen down detection.
 *
 * This driver can either poll or use an interrupt to indicate a pen down
 * event. If the irq request fails then it will fall back to polling mode.
 */
static int pen_int;
module_param(pen_int, int, 0);
MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)");

/*
 * Pressure readback.
 *
 * Set to 1 to read back pen down pressure
 */
static int pressure;
module_param(pressure, int, 0);
MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)");

/*
 * AC97 touch data slot.
 *
 * Touch screen readback data ac97 slot
 */
static int ac97_touch_slot = 5;
module_param(ac97_touch_slot, int, 0);
MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");


/* flush AC97 slot 5 FIFO on pxa machines */
#ifdef CONFIG_PXA27x
static void wm97xx_acc_pen_up(struct wm97xx *wm)
{
	schedule_timeout_uninterruptible(1);

	while (MISR & (1 << 2))
		MODR;
}
#else
static void wm97xx_acc_pen_up(struct wm97xx *wm)
{
	int count = 16;
	schedule_timeout_uninterruptible(1);

	while (count < 16) {
		MODR;
		count--;
	}
}
#endif

static int wm97xx_acc_pen_down(struct wm97xx *wm)
{
	u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES;
	int reads = 0;

	/* When the AC97 queue has been drained we need to allow time
	 * to buffer up samples otherwise we end up spinning polling
	 * for samples.  The controller can't have a suitably low
	 * threashold set to use the notifications it gives.
	 */
	schedule_timeout_uninterruptible(1);

	if (tries > 5) {
		tries = 0;
		return RC_PENUP;
	}

	x = MODR;
	if (x == last) {
		tries++;
		return RC_AGAIN;
	}
	last = x;
	do {
		if (reads)
			x = MODR;
		y = MODR;
		if (pressure)
			p = MODR;

		/* are samples valid */
		if ((x & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_X ||
		    (y & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_Y ||
		    (p & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_PRES)
			goto up;

		/* coordinate is good */
		tries = 0;
		input_report_abs(wm->input_dev, ABS_X, x & 0xfff);
		input_report_abs(wm->input_dev, ABS_Y, y & 0xfff);
		input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff);
		input_sync(wm->input_dev);
		reads++;
	} while (reads < cinfo[sp_idx].reads);
up:
	return RC_PENDOWN | RC_AGAIN;
}

static int wm97xx_acc_startup(struct wm97xx *wm)
{
	int idx = 0;

	/* check we have a codec */
	if (wm->ac97 == NULL)
		return -ENODEV;

	/* Go you big red fire engine */
	for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) {
		if (wm->id != cinfo[idx].id)
			continue;
		sp_idx = idx;
		if (cont_rate <= cinfo[idx].speed)
			break;
	}
	wm->acc_rate = cinfo[sp_idx].code;
	wm->acc_slot = ac97_touch_slot;
	dev_info(wm->dev,
		 "mainstone accelerated touchscreen driver, %d samples/sec\n",
		 cinfo[sp_idx].speed);

	/* codec specific irq config */
	if (pen_int) {
		switch (wm->id) {
		case WM9705_ID2:
			wm->pen_irq = IRQ_GPIO(4);
			set_irq_type(IRQ_GPIO(4), IRQ_TYPE_EDGE_BOTH);
			break;
		case WM9712_ID2:
		case WM9713_ID2:
			/* enable pen down interrupt */
			/* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */
			wm->pen_irq = MAINSTONE_AC97_IRQ;
			wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN,
					   WM97XX_GPIO_POL_HIGH,
					   WM97XX_GPIO_STICKY,
					   WM97XX_GPIO_WAKE);
			wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT,
					   WM97XX_GPIO_POL_HIGH,
					   WM97XX_GPIO_NOTSTICKY,
					   WM97XX_GPIO_NOWAKE);
			break;
		default:
			dev_err(wm->dev,
				"pen down irq not supported on this device\n");
			pen_int = 0;
			break;
		}
	}

	return 0;
}

static void wm97xx_acc_shutdown(struct wm97xx *wm)
{
	/* codec specific deconfig */
	if (pen_int) {
		switch (wm->id & 0xffff) {
		case WM9705_ID2:
			wm->pen_irq = 0;
			break;
		case WM9712_ID2:
		case WM9713_ID2:
			/* disable interrupt */
			wm->pen_irq = 0;
			break;
		}
	}
}

static void wm97xx_irq_enable(struct wm97xx *wm, int enable)
{
	if (enable)
		enable_irq(wm->pen_irq);
	else
		disable_irq(wm->pen_irq);
}

static struct wm97xx_mach_ops mainstone_mach_ops = {
	.acc_enabled = 1,
	.acc_pen_up = wm97xx_acc_pen_up,
	.acc_pen_down = wm97xx_acc_pen_down,
	.acc_startup = wm97xx_acc_startup,
	.acc_shutdown = wm97xx_acc_shutdown,
	.irq_enable = wm97xx_irq_enable,
	.irq_gpio = WM97XX_GPIO_2,
};

static int mainstone_wm97xx_probe(struct platform_device *pdev)
{
	struct wm97xx *wm = platform_get_drvdata(pdev);

	return wm97xx_register_mach_ops(wm, &mainstone_mach_ops);
}

static int mainstone_wm97xx_remove(struct platform_device *pdev)
{
	struct wm97xx *wm = platform_get_drvdata(pdev);

	wm97xx_unregister_mach_ops(wm);
	return 0;
}

static struct platform_driver mainstone_wm97xx_driver = {
	.probe = mainstone_wm97xx_probe,
	.remove = mainstone_wm97xx_remove,
	.driver = {
		.name = "wm97xx-touch",
	},
};

static int __init mainstone_wm97xx_init(void)
{
	return platform_driver_register(&mainstone_wm97xx_driver);
}

static void __exit mainstone_wm97xx_exit(void)
{
	platform_driver_unregister(&mainstone_wm97xx_driver);
}

module_init(mainstone_wm97xx_init);
module_exit(mainstone_wm97xx_exit);

/* Module information */
MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>");
MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone");
MODULE_LICENSE("GPL");
Commit	Line	Data
4db8a5f2 MB	1	/*
	2	* mainstone-wm97xx.c -- Mainstone Continuous Touch screen driver for
	3	* Wolfson WM97xx AC97 Codecs.
	4	*
	5	* Copyright 2004, 2007 Wolfson Microelectronics PLC.
	6	* Author: Liam Girdwood
	7	* liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
	8	* Parts Copyright : Ian Molton <spyro@f2s.com>
	9	* Andrew Zabolotny <zap@homelink.ru>
	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	* This is a wm97xx extended touch driver to capture touch
	18	* data in a continuous manner on the Intel XScale archictecture
	19	*
	20	* Features:
	21	* - codecs supported:- WM9705, WM9712, WM9713
	22	* - processors supported:- Intel XScale PXA25x, PXA26x, PXA27x
	23	*
	24	*/
	25
	26	#include <linux/module.h>
	27	#include <linux/moduleparam.h>
	28	#include <linux/version.h>
	29	#include <linux/kernel.h>
	30	#include <linux/init.h>
	31	#include <linux/delay.h>
	32	#include <linux/irq.h>
	33	#include <linux/interrupt.h>
	34	#include <linux/wm97xx.h>
	35	#include <linux/io.h>
a09e64fb	36	#include <mach/pxa-regs.h>
4db8a5f2 MB	37
	38	#define VERSION "0.13"
	39
	40	struct continuous {
	41	u16 id; /* codec id */
	42	u8 code; /* continuous code */
	43	u8 reads; /* number of coord reads per read cycle */
	44	u32 speed; /* number of coords per second */
	45	};
	46
	47	#define WM_READS(sp) ((sp / HZ) + 1)
	48
	49	static const struct continuous cinfo[] = {
	50	{WM9705_ID2, 0, WM_READS(94), 94},
	51	{WM9705_ID2, 1, WM_READS(188), 188},
	52	{WM9705_ID2, 2, WM_READS(375), 375},
	53	{WM9705_ID2, 3, WM_READS(750), 750},
	54	{WM9712_ID2, 0, WM_READS(94), 94},
	55	{WM9712_ID2, 1, WM_READS(188), 188},
	56	{WM9712_ID2, 2, WM_READS(375), 375},
	57	{WM9712_ID2, 3, WM_READS(750), 750},
	58	{WM9713_ID2, 0, WM_READS(94), 94},
	59	{WM9713_ID2, 1, WM_READS(120), 120},
	60	{WM9713_ID2, 2, WM_READS(154), 154},
	61	{WM9713_ID2, 3, WM_READS(188), 188},
	62	};
	63
	64	/* continuous speed index */
	65	static int sp_idx;
	66	static u16 last, tries;
	67
	68	/*
	69	* Pen sampling frequency (Hz) in continuous mode.
	70	*/
	71	static int cont_rate = 200;
	72	module_param(cont_rate, int, 0);
	73	MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)");
	74
	75	/*
	76	* Pen down detection.
	77	*
	78	* This driver can either poll or use an interrupt to indicate a pen down
	79	* event. If the irq request fails then it will fall back to polling mode.
	80	*/
	81	static int pen_int;
	82	module_param(pen_int, int, 0);
	83	MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)");
	84
	85	/*
	86	* Pressure readback.
	87	*
	88	* Set to 1 to read back pen down pressure
	89	*/
	90	static int pressure;
	91	module_param(pressure, int, 0);
	92	MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)");
	93
	94	/*
	95	* AC97 touch data slot.
	96	*
	97	* Touch screen readback data ac97 slot
	98	*/
	99	static int ac97_touch_slot = 5;
	100	module_param(ac97_touch_slot, int, 0);
101	MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");
102
103
104	/* flush AC97 slot 5 FIFO on pxa machines */
105	#ifdef CONFIG_PXA27x
106	static void wm97xx_acc_pen_up(struct wm97xx *wm)
107	{
108	schedule_timeout_uninterruptible(1);
109
110	while (MISR & (1 << 2))
111	MODR;
112	}
113	#else
114	static void wm97xx_acc_pen_up(struct wm97xx *wm)
115	{
116	int count = 16;
117	schedule_timeout_uninterruptible(1);
118
119	while (count < 16) {
120	MODR;
121	count--;
122	}
123	}
124	#endif
125
126	static int wm97xx_acc_pen_down(struct wm97xx *wm)
127	{
128	u16 x, y, p = 0x100 \| WM97XX_ADCSEL_PRES;
129	int reads = 0;
130
131	/* When the AC97 queue has been drained we need to allow time
132	* to buffer up samples otherwise we end up spinning polling
133	* for samples. The controller can't have a suitably low
134	* threashold set to use the notifications it gives.
135	*/
136	schedule_timeout_uninterruptible(1);
137
138	if (tries > 5) {
139	tries = 0;
140	return RC_PENUP;
141	}
142
143	x = MODR;
144	if (x == last) {
145	tries++;
146	return RC_AGAIN;
147	}
148	last = x;
149	do {
150	if (reads)
151	x = MODR;
152	y = MODR;
153	if (pressure)
154	p = MODR;
155
156	/* are samples valid */
157	if ((x & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_X \|\|
158	(y & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_Y \|\|
159	(p & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_PRES)
160	goto up;
161
162	/* coordinate is good */
163	tries = 0;
164	input_report_abs(wm->input_dev, ABS_X, x & 0xfff);
165	input_report_abs(wm->input_dev, ABS_Y, y & 0xfff);
166	input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff);
167	input_sync(wm->input_dev);
168	reads++;
169	} while (reads < cinfo[sp_idx].reads);
170	up:
171	return RC_PENDOWN \| RC_AGAIN;
172	}
173
174	static int wm97xx_acc_startup(struct wm97xx *wm)
175	{
176	int idx = 0;
177
178	/* check we have a codec */
179	if (wm->ac97 == NULL)
180	return -ENODEV;
181
182	/* Go you big red fire engine */
183	for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) {
184	if (wm->id != cinfo[idx].id)
185	continue;
186	sp_idx = idx;
187	if (cont_rate <= cinfo[idx].speed)
188	break;
189	}
190	wm->acc_rate = cinfo[sp_idx].code;
191	wm->acc_slot = ac97_touch_slot;
192	dev_info(wm->dev,
193	"mainstone accelerated touchscreen driver, %d samples/sec\n",
194	cinfo[sp_idx].speed);
195
196	/* codec specific irq config */
197	if (pen_int) {
198	switch (wm->id) {
199	case WM9705_ID2:
200	wm->pen_irq = IRQ_GPIO(4);
6cab4860	201	set_irq_type(IRQ_GPIO(4), IRQ_TYPE_EDGE_BOTH);
4db8a5f2 MB	202	break;
	203	case WM9712_ID2:
	204	case WM9713_ID2:
	205	/* enable pen down interrupt */
	206	/* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */
	207	wm->pen_irq = MAINSTONE_AC97_IRQ;
	208	wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN,
	209	WM97XX_GPIO_POL_HIGH,
	210	WM97XX_GPIO_STICKY,
	211	WM97XX_GPIO_WAKE);
	212	wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT,
	213	WM97XX_GPIO_POL_HIGH,
	214	WM97XX_GPIO_NOTSTICKY,
	215	WM97XX_GPIO_NOWAKE);
	216	break;
	217	default:
	218	dev_err(wm->dev,
	219	"pen down irq not supported on this device\n");
	220	pen_int = 0;
	221	break;
	222	}
	223	}
	224
	225	return 0;
	226	}
	227
	228	static void wm97xx_acc_shutdown(struct wm97xx *wm)
	229	{
	230	/* codec specific deconfig */
	231	if (pen_int) {
	232	switch (wm->id & 0xffff) {
	233	case WM9705_ID2:
	234	wm->pen_irq = 0;
	235	break;
	236	case WM9712_ID2:
	237	case WM9713_ID2:
	238	/* disable interrupt */
	239	wm->pen_irq = 0;
	240	break;
	241	}
	242	}
	243	}
	244
	245	static void wm97xx_irq_enable(struct wm97xx *wm, int enable)
	246	{
	247	if (enable)
	248	enable_irq(wm->pen_irq);
	249	else
	250	disable_irq(wm->pen_irq);
	251	}
	252
	253	static struct wm97xx_mach_ops mainstone_mach_ops = {
	254	.acc_enabled = 1,
	255	.acc_pen_up = wm97xx_acc_pen_up,
	256	.acc_pen_down = wm97xx_acc_pen_down,
	257	.acc_startup = wm97xx_acc_startup,
	258	.acc_shutdown = wm97xx_acc_shutdown,
	259	.irq_enable = wm97xx_irq_enable,
	260	.irq_gpio = WM97XX_GPIO_2,
	261	};
	262
	263	static int mainstone_wm97xx_probe(struct platform_device *pdev)
	264	{
	265	struct wm97xx *wm = platform_get_drvdata(pdev);
266
267	return wm97xx_register_mach_ops(wm, &mainstone_mach_ops);
268	}
269
270	static int mainstone_wm97xx_remove(struct platform_device *pdev)
271	{
272	struct wm97xx *wm = platform_get_drvdata(pdev);
273
274	wm97xx_unregister_mach_ops(wm);
275	return 0;
276	}
277
278	static struct platform_driver mainstone_wm97xx_driver = {
279	.probe = mainstone_wm97xx_probe,
280	.remove = mainstone_wm97xx_remove,
281	.driver = {
282	.name = "wm97xx-touch",
283	},
284	};
285
286	static int __init mainstone_wm97xx_init(void)
287	{
288	return platform_driver_register(&mainstone_wm97xx_driver);
289	}
290
291	static void __exit mainstone_wm97xx_exit(void)
292	{
293	platform_driver_unregister(&mainstone_wm97xx_driver);
294	}
295
296	module_init(mainstone_wm97xx_init);
297	module_exit(mainstone_wm97xx_exit);
298
299	/* Module information */
300	MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>");
301	MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone");
302	MODULE_LICENSE("GPL");