[net-next-2.6.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 <lrg@slimlogic.co.uk>
 * 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 architecture
 *
 *  Features:
 *       - codecs supported:- WM9705, WM9712, WM9713
 *       - processors supported:- Intel XScale PXA25x, PXA26x, PXA27x
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.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 <linux/gpio.h>

#include <mach/regs-ac97.h>

#include <asm/mach-types.h>

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;
static int irq;

/*
 * 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)
{
	unsigned int count;

	schedule_timeout_uninterruptible(1);

	for (count = 0; count < 16; count++)
		MODR;
}
#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
	 * threshold 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_report_key(wm->input_dev, BTN_TOUCH, (p != 0));
		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, ret = 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);

	/* IRQ driven touchscreen is used on Palm hardware */
	if (machine_is_palmt5() || machine_is_palmtx() || machine_is_palmld()) {
		pen_int = 1;
		irq = 27;
		/* There is some obscure mutant of WM9712 interbred with WM9713
		 * used on Palm HW */
		wm->variant = WM97xx_WM1613;
	} else if (machine_is_mainstone() && pen_int)
		irq = 4;

	if (irq) {
		ret = gpio_request(irq, "Touchscreen IRQ");
		if (ret)
			goto out;

		ret = gpio_direction_input(irq);
		if (ret) {
			gpio_free(irq);
			goto out;
		}

		wm->pen_irq = gpio_to_irq(irq);
		set_irq_type(wm->pen_irq, IRQ_TYPE_EDGE_BOTH);
	} else /* pen irq not supported */
		pen_int = 0;

	/* codec specific irq config */
	if (pen_int) {
		switch (wm->id) {
		case WM9705_ID2:
			break;
		case WM9712_ID2:
		case WM9713_ID2:
			/* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */
			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;
		}
	}

out:
	return ret;
}

static void wm97xx_acc_shutdown(struct wm97xx *wm)
{
	/* codec specific deconfig */
	if (pen_int) {
		if (irq)
			gpio_free(irq);
		wm->pen_irq = 0;
	}
}

static void wm97xx_irq_enable(struct wm97xx *wm, int enable)
{
	if (enable)
		enable_irq(wm->pen_irq);
	else
		disable_irq_nosync(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 <lrg@slimlogic.co.uk>");
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.
b8d055a8	6	* Author: Liam Girdwood <lrg@slimlogic.co.uk>
4db8a5f2 MB	7	* Parts Copyright : Ian Molton <spyro@f2s.com>
	8	* Andrew Zabolotny <zap@homelink.ru>
	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by the
	12	* Free Software Foundation; either version 2 of the License, or (at your
	13	* option) any later version.
	14	*
	15	* Notes:
	16	* This is a wm97xx extended touch driver to capture touch
af901ca1	17	* data in a continuous manner on the Intel XScale architecture
4db8a5f2 MB	18	*
	19	* Features:
	20	* - codecs supported:- WM9705, WM9712, WM9713
	21	* - processors supported:- Intel XScale PXA25x, PXA26x, PXA27x
	22	*
	23	*/
	24
	25	#include <linux/module.h>
	26	#include <linux/moduleparam.h>
4db8a5f2 MB	27	#include <linux/kernel.h>
	28	#include <linux/init.h>
	29	#include <linux/delay.h>
	30	#include <linux/irq.h>
	31	#include <linux/interrupt.h>
	32	#include <linux/wm97xx.h>
	33	#include <linux/io.h>
b833306f MV	34	#include <linux/gpio.h>
b833306f MV	35
1f017a99	36	#include <mach/regs-ac97.h>
4db8a5f2	37
b833306f	38	#include <asm/mach-types.h>
4db8a5f2 MB	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;
b833306f	67	static int irq;
4db8a5f2 MB	68
	69	/*
	70	* Pen sampling frequency (Hz) in continuous mode.
	71	*/
	72	static int cont_rate = 200;
	73	module_param(cont_rate, int, 0);
	74	MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)");
	75
	76	/*
	77	* Pen down detection.
	78	*
	79	* This driver can either poll or use an interrupt to indicate a pen down
	80	* event. If the irq request fails then it will fall back to polling mode.
	81	*/
	82	static int pen_int;
	83	module_param(pen_int, int, 0);
	84	MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)");
	85
	86	/*
	87	* Pressure readback.
	88	*
	89	* Set to 1 to read back pen down pressure
	90	*/
	91	static int pressure;
	92	module_param(pressure, int, 0);
	93	MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)");
	94
	95	/*
	96	* AC97 touch data slot.
	97	*
	98	* Touch screen readback data ac97 slot
	99	*/
	100	static int ac97_touch_slot = 5;
	101	module_param(ac97_touch_slot, int, 0);
	102	MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");
	103
	104
	105	/* flush AC97 slot 5 FIFO on pxa machines */
	106	#ifdef CONFIG_PXA27x
	107	static void wm97xx_acc_pen_up(struct wm97xx *wm)
	108	{
	109	schedule_timeout_uninterruptible(1);
	110
	111	while (MISR & (1 << 2))
	112	MODR;
	113	}
	114	#else
	115	static void wm97xx_acc_pen_up(struct wm97xx *wm)
	116	{
180deb50 JS	117	unsigned int count;
180deb50 JS	118
4db8a5f2 MB	119	schedule_timeout_uninterruptible(1);
4db8a5f2 MB	120
180deb50	121	for (count = 0; count < 16; count++)
4db8a5f2	122	MODR;
4db8a5f2 MB	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
af901ca1	134	* threshold set to use the notifications it gives.
4db8a5f2 MB	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);
cd2d64b1	167	input_report_key(wm->input_dev, BTN_TOUCH, (p != 0));
4db8a5f2 MB	168	input_sync(wm->input_dev);
	169	reads++;
	170	} while (reads < cinfo[sp_idx].reads);
	171	up:
	172	return RC_PENDOWN \| RC_AGAIN;
	173	}
	174
	175	static int wm97xx_acc_startup(struct wm97xx *wm)
	176	{
b833306f	177	int idx = 0, ret = 0;
4db8a5f2 MB	178
	179	/* check we have a codec */
	180	if (wm->ac97 == NULL)
	181	return -ENODEV;
	182
	183	/* Go you big red fire engine */
	184	for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) {
	185	if (wm->id != cinfo[idx].id)
	186	continue;
	187	sp_idx = idx;
	188	if (cont_rate <= cinfo[idx].speed)
	189	break;
	190	}
	191	wm->acc_rate = cinfo[sp_idx].code;
	192	wm->acc_slot = ac97_touch_slot;
	193	dev_info(wm->dev,
	194	"mainstone accelerated touchscreen driver, %d samples/sec\n",
	195	cinfo[sp_idx].speed);
	196
b833306f MV	197	/* IRQ driven touchscreen is used on Palm hardware */
	198	if (machine_is_palmt5() \|\| machine_is_palmtx() \|\| machine_is_palmld()) {
	199	pen_int = 1;
	200	irq = 27;
99fde513 MV	201	/* There is some obscure mutant of WM9712 interbred with WM9713
	202	* used on Palm HW */
	203	wm->variant = WM97xx_WM1613;
b833306f MV	204	} else if (machine_is_mainstone() && pen_int)
	205	irq = 4;
	206
	207	if (irq) {
	208	ret = gpio_request(irq, "Touchscreen IRQ");
	209	if (ret)
	210	goto out;
	211
	212	ret = gpio_direction_input(irq);
	213	if (ret) {
	214	gpio_free(irq);
	215	goto out;
	216	}
	217
	218	wm->pen_irq = gpio_to_irq(irq);
	219	set_irq_type(wm->pen_irq, IRQ_TYPE_EDGE_BOTH);
	220	} else /* pen irq not supported */
	221	pen_int = 0;
	222
4db8a5f2 MB	223	/* codec specific irq config */
	224	if (pen_int) {
	225	switch (wm->id) {
	226	case WM9705_ID2:
4db8a5f2 MB	227	break;
	228	case WM9712_ID2:
	229	case WM9713_ID2:
4db8a5f2	230	/* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */
4db8a5f2 MB	231	wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN,
	232	WM97XX_GPIO_POL_HIGH,
	233	WM97XX_GPIO_STICKY,
	234	WM97XX_GPIO_WAKE);
	235	wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT,
	236	WM97XX_GPIO_POL_HIGH,
	237	WM97XX_GPIO_NOTSTICKY,
	238	WM97XX_GPIO_NOWAKE);
	239	break;
	240	default:
	241	dev_err(wm->dev,
	242	"pen down irq not supported on this device\n");
	243	pen_int = 0;
	244	break;
	245	}
	246	}
	247
b833306f MV	248	out:
b833306f MV	249	return ret;
4db8a5f2 MB	250	}
	251
	252	static void wm97xx_acc_shutdown(struct wm97xx *wm)
	253	{
	254	/* codec specific deconfig */
	255	if (pen_int) {
b833306f MV	256	if (irq)
	257	gpio_free(irq);
	258	wm->pen_irq = 0;
4db8a5f2 MB	259	}
	260	}
	261
	262	static void wm97xx_irq_enable(struct wm97xx *wm, int enable)
	263	{
	264	if (enable)
	265	enable_irq(wm->pen_irq);
	266	else
a700e72d	267	disable_irq_nosync(wm->pen_irq);
4db8a5f2 MB	268	}
	269
	270	static struct wm97xx_mach_ops mainstone_mach_ops = {
	271	.acc_enabled = 1,
	272	.acc_pen_up = wm97xx_acc_pen_up,
	273	.acc_pen_down = wm97xx_acc_pen_down,
	274	.acc_startup = wm97xx_acc_startup,
	275	.acc_shutdown = wm97xx_acc_shutdown,
	276	.irq_enable = wm97xx_irq_enable,
	277	.irq_gpio = WM97XX_GPIO_2,
	278	};
	279
	280	static int mainstone_wm97xx_probe(struct platform_device *pdev)
	281	{
	282	struct wm97xx *wm = platform_get_drvdata(pdev);
	283
	284	return wm97xx_register_mach_ops(wm, &mainstone_mach_ops);
	285	}
	286
	287	static int mainstone_wm97xx_remove(struct platform_device *pdev)
	288	{
	289	struct wm97xx *wm = platform_get_drvdata(pdev);
	290
	291	wm97xx_unregister_mach_ops(wm);
	292	return 0;
	293	}
	294
	295	static struct platform_driver mainstone_wm97xx_driver = {
	296	.probe = mainstone_wm97xx_probe,
	297	.remove = mainstone_wm97xx_remove,
	298	.driver = {
	299	.name = "wm97xx-touch",
	300	},
	301	};
	302
	303	static int __init mainstone_wm97xx_init(void)
	304	{
	305	return platform_driver_register(&mainstone_wm97xx_driver);
	306	}
	307
	308	static void __exit mainstone_wm97xx_exit(void)
	309	{
	310	platform_driver_unregister(&mainstone_wm97xx_driver);
	311	}
	312
	313	module_init(mainstone_wm97xx_init);
	314	module_exit(mainstone_wm97xx_exit);
	315
	316	/* Module information */
b8d055a8	317	MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
4db8a5f2 MB	318	MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone");
4db8a5f2 MB	319	MODULE_LICENSE("GPL");