[linux-2.6-block.git] / drivers / input / touchscreen / atmel-wm97xx.c

/*
 * Atmel AT91 and AVR32 continuous touch screen driver for Wolfson WM97xx AC97
 * codecs.
 *
 * Copyright (C) 2008 - 2009 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */
#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/timer.h>
#include <linux/gpio.h>
#include <linux/io.h>
#include <linux/slab.h>

#define AC97C_ICA		0x10
#define AC97C_CBRHR		0x30
#define AC97C_CBSR		0x38
#define AC97C_CBMR		0x3c
#define AC97C_IER		0x54
#define AC97C_IDR		0x58

#define AC97C_RXRDY		(1 << 4)
#define AC97C_OVRUN		(1 << 5)

#define AC97C_CMR_SIZE_20	(0 << 16)
#define AC97C_CMR_SIZE_18	(1 << 16)
#define AC97C_CMR_SIZE_16	(2 << 16)
#define AC97C_CMR_SIZE_10	(3 << 16)
#define AC97C_CMR_CEM_LITTLE	(1 << 18)
#define AC97C_CMR_CEM_BIG	(0 << 18)
#define AC97C_CMR_CENA		(1 << 21)

#define AC97C_INT_CBEVT		(1 << 4)

#define AC97C_SR_CAEVT		(1 << 3)

#define AC97C_CH_MASK(slot)						\
	(0x7 << (3 * (slot - 3)))
#define AC97C_CH_ASSIGN(slot, channel)					\
	(AC97C_CHANNEL_##channel << (3 * (slot - 3)))
#define AC97C_CHANNEL_NONE	0x0
#define AC97C_CHANNEL_B		0x2

#define ac97c_writel(chip, reg, val)			\
	__raw_writel((val), (chip)->regs + AC97C_##reg)
#define ac97c_readl(chip, reg)				\
	__raw_readl((chip)->regs + AC97C_##reg)

#ifdef CONFIG_CPU_AT32AP700X
#define ATMEL_WM97XX_AC97C_IOMEM	(0xfff02800)
#define ATMEL_WM97XX_AC97C_IRQ		(29)
#define ATMEL_WM97XX_GPIO_DEFAULT	(32+16) /* Pin 16 on port B. */
#else
#error Unknown CPU, this driver only supports AT32AP700X CPUs.
#endif

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;

/*
 * Pen sampling frequency (Hz) in continuous mode.
 */
static int cont_rate = 188;
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 = 1;
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");

/*
 * GPIO line number.
 *
 * Set to GPIO number where the signal from the WM97xx device is hooked up.
 */
static int atmel_gpio_line = ATMEL_WM97XX_GPIO_DEFAULT;
module_param(atmel_gpio_line, int, 0);
MODULE_PARM_DESC(atmel_gpio_line, "GPIO line number connected to WM97xx");

struct atmel_wm97xx {
	struct wm97xx		*wm;
	struct timer_list	pen_timer;
	void __iomem		*regs;
	unsigned long		ac97c_irq;
	unsigned long		gpio_pen;
	unsigned long		gpio_irq;
	unsigned short		x;
	unsigned short		y;
};

static irqreturn_t atmel_wm97xx_channel_b_interrupt(int irq, void *dev_id)
{
	struct atmel_wm97xx *atmel_wm97xx = dev_id;
	struct wm97xx *wm = atmel_wm97xx->wm;
	int status = ac97c_readl(atmel_wm97xx, CBSR);
	irqreturn_t retval = IRQ_NONE;

	if (status & AC97C_OVRUN) {
		dev_dbg(&wm->touch_dev->dev, "AC97C overrun\n");
		ac97c_readl(atmel_wm97xx, CBRHR);
		retval = IRQ_HANDLED;
	} else if (status & AC97C_RXRDY) {
		u16 data;
		u16 value;
		u16 source;
		u16 pen_down;

		data = ac97c_readl(atmel_wm97xx, CBRHR);
		value = data & 0x0fff;
		source = data & WM97XX_ADCSRC_MASK;
		pen_down = (data & WM97XX_PEN_DOWN) >> 8;

		if (source == WM97XX_ADCSEL_X)
			atmel_wm97xx->x = value;
		if (source == WM97XX_ADCSEL_Y)
			atmel_wm97xx->y = value;

		if (!pressure && source == WM97XX_ADCSEL_Y) {
			input_report_abs(wm->input_dev, ABS_X, atmel_wm97xx->x);
			input_report_abs(wm->input_dev, ABS_Y, atmel_wm97xx->y);
			input_report_key(wm->input_dev, BTN_TOUCH, pen_down);
			input_sync(wm->input_dev);
		} else if (pressure && source == WM97XX_ADCSEL_PRES) {
			input_report_abs(wm->input_dev, ABS_X, atmel_wm97xx->x);
			input_report_abs(wm->input_dev, ABS_Y, atmel_wm97xx->y);
			input_report_abs(wm->input_dev, ABS_PRESSURE, value);
			input_report_key(wm->input_dev, BTN_TOUCH, value);
			input_sync(wm->input_dev);
		}

		retval = IRQ_HANDLED;
	}

	return retval;
}

static void atmel_wm97xx_acc_pen_up(struct wm97xx *wm)
{
	struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(wm->touch_dev);
	struct input_dev *input_dev = wm->input_dev;
	int pen_down = gpio_get_value(atmel_wm97xx->gpio_pen);

	if (pen_down != 0) {
		mod_timer(&atmel_wm97xx->pen_timer,
			  jiffies + msecs_to_jiffies(1));
	} else {
		if (pressure)
			input_report_abs(input_dev, ABS_PRESSURE, 0);
		input_report_key(input_dev, BTN_TOUCH, 0);
		input_sync(input_dev);
	}
}

static void atmel_wm97xx_pen_timer(unsigned long data)
{
	atmel_wm97xx_acc_pen_up((struct wm97xx *)data);
}

static int atmel_wm97xx_acc_startup(struct wm97xx *wm)
{
	struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(wm->touch_dev);
	int idx = 0;

	if (wm->ac97 == NULL)
		return -ENODEV;

	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->touch_dev->dev, "atmel accelerated touchscreen driver, "
			"%d samples/sec\n", cinfo[sp_idx].speed);

	if (pen_int) {
		unsigned long reg;

		wm->pen_irq = atmel_wm97xx->gpio_irq;

		switch (wm->id) {
		case WM9712_ID2: /* Fall through. */
		case WM9713_ID2:
			/*
			 * Use GPIO 13 (PEN_DOWN) to assert GPIO line 3
			 * (PENDOWN).
			 */
			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_3, WM97XX_GPIO_OUT,
					WM97XX_GPIO_POL_HIGH,
					WM97XX_GPIO_NOTSTICKY,
					WM97XX_GPIO_NOWAKE);
		case WM9705_ID2: /* Fall through. */
			/*
			 * Enable touch data slot in AC97 controller channel B.
			 */
			reg = ac97c_readl(atmel_wm97xx, ICA);
			reg &= ~AC97C_CH_MASK(wm->acc_slot);
			reg |= AC97C_CH_ASSIGN(wm->acc_slot, B);
			ac97c_writel(atmel_wm97xx, ICA, reg);

			/*
			 * Enable channel and interrupt for RXRDY and OVERRUN.
			 */
			ac97c_writel(atmel_wm97xx, CBMR, AC97C_CMR_CENA
					| AC97C_CMR_CEM_BIG
					| AC97C_CMR_SIZE_16
					| AC97C_OVRUN
					| AC97C_RXRDY);
			/* Dummy read to empty RXRHR. */
			ac97c_readl(atmel_wm97xx, CBRHR);
			/*
			 * Enable interrupt for channel B in the AC97
			 * controller.
			 */
			ac97c_writel(atmel_wm97xx, IER, AC97C_INT_CBEVT);
			break;
		default:
			dev_err(&wm->touch_dev->dev, "pen down irq not "
					"supported on this device\n");
			pen_int = 0;
			break;
		}
	}

	return 0;
}

static void atmel_wm97xx_acc_shutdown(struct wm97xx *wm)
{
	if (pen_int) {
		struct atmel_wm97xx *atmel_wm97xx =
			platform_get_drvdata(wm->touch_dev);
		unsigned long ica;

		switch (wm->id & 0xffff) {
		case WM9705_ID2: /* Fall through. */
		case WM9712_ID2: /* Fall through. */
		case WM9713_ID2:
			/* Disable slot and turn off channel B interrupts. */
			ica = ac97c_readl(atmel_wm97xx, ICA);
			ica &= ~AC97C_CH_MASK(wm->acc_slot);
			ac97c_writel(atmel_wm97xx, ICA, ica);
			ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT);
			ac97c_writel(atmel_wm97xx, CBMR, 0);
			wm->pen_irq = 0;
			break;
		default:
			dev_err(&wm->touch_dev->dev, "unknown codec\n");
			break;
		}
	}
}

static void atmel_wm97xx_irq_enable(struct wm97xx *wm, int enable)
{
	/* Intentionally left empty. */
}

static struct wm97xx_mach_ops atmel_mach_ops = {
	.acc_enabled	= 1,
	.acc_pen_up	= atmel_wm97xx_acc_pen_up,
	.acc_startup	= atmel_wm97xx_acc_startup,
	.acc_shutdown	= atmel_wm97xx_acc_shutdown,
	.irq_enable	= atmel_wm97xx_irq_enable,
	.irq_gpio	= WM97XX_GPIO_3,
};

static int __init atmel_wm97xx_probe(struct platform_device *pdev)
{
	struct wm97xx *wm = platform_get_drvdata(pdev);
	struct atmel_wm97xx *atmel_wm97xx;
	int ret;

	atmel_wm97xx = kzalloc(sizeof(struct atmel_wm97xx), GFP_KERNEL);
	if (!atmel_wm97xx) {
		dev_dbg(&pdev->dev, "out of memory\n");
		return -ENOMEM;
	}

	atmel_wm97xx->wm	= wm;
	atmel_wm97xx->regs	= (void *)ATMEL_WM97XX_AC97C_IOMEM;
	atmel_wm97xx->ac97c_irq	= ATMEL_WM97XX_AC97C_IRQ;
	atmel_wm97xx->gpio_pen	= atmel_gpio_line;
	atmel_wm97xx->gpio_irq	= gpio_to_irq(atmel_wm97xx->gpio_pen);

	setup_timer(&atmel_wm97xx->pen_timer, atmel_wm97xx_pen_timer,
			(unsigned long)wm);

	ret = request_irq(atmel_wm97xx->ac97c_irq,
			  atmel_wm97xx_channel_b_interrupt,
			  IRQF_SHARED, "atmel-wm97xx-ch-b", atmel_wm97xx);
	if (ret) {
		dev_dbg(&pdev->dev, "could not request ac97c irq\n");
		goto err;
	}

	platform_set_drvdata(pdev, atmel_wm97xx);

	ret = wm97xx_register_mach_ops(wm, &atmel_mach_ops);
	if (ret)
		goto err_irq;

	return ret;

err_irq:
	free_irq(atmel_wm97xx->ac97c_irq, atmel_wm97xx);
err:
	platform_set_drvdata(pdev, NULL);
	kfree(atmel_wm97xx);
	return ret;
}

static int __exit atmel_wm97xx_remove(struct platform_device *pdev)
{
	struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);
	struct wm97xx *wm = atmel_wm97xx->wm;

	ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT);
	free_irq(atmel_wm97xx->ac97c_irq, atmel_wm97xx);
	del_timer_sync(&atmel_wm97xx->pen_timer);
	wm97xx_unregister_mach_ops(wm);
	platform_set_drvdata(pdev, NULL);
	kfree(atmel_wm97xx);

	return 0;
}

#ifdef CONFIG_PM
static int atmel_wm97xx_suspend(struct platform_device *pdev, pm_message_t msg)
{
	struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);

	ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT);
	disable_irq(atmel_wm97xx->gpio_irq);
	del_timer_sync(&atmel_wm97xx->pen_timer);

	return 0;
}

static int atmel_wm97xx_resume(struct platform_device *pdev)
{
	struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);
	struct wm97xx *wm = atmel_wm97xx->wm;

	if (wm->input_dev->users) {
		enable_irq(atmel_wm97xx->gpio_irq);
		ac97c_writel(atmel_wm97xx, IER, AC97C_INT_CBEVT);
	}

	return 0;
}
#else
#define atmel_wm97xx_suspend	NULL
#define atmel_wm97xx_resume	NULL
#endif

static struct platform_driver atmel_wm97xx_driver = {
	.remove		= __exit_p(atmel_wm97xx_remove),
	.driver		= {
		.name = "wm97xx-touch",
	},
	.suspend	= atmel_wm97xx_suspend,
	.resume		= atmel_wm97xx_resume,
};

static int __init atmel_wm97xx_init(void)
{
	return platform_driver_probe(&atmel_wm97xx_driver, atmel_wm97xx_probe);
}
module_init(atmel_wm97xx_init);

static void __exit atmel_wm97xx_exit(void)
{
	platform_driver_unregister(&atmel_wm97xx_driver);
}
module_exit(atmel_wm97xx_exit);

MODULE_AUTHOR("Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>");
MODULE_DESCRIPTION("wm97xx continuous touch driver for Atmel AT91 and AVR32");
MODULE_LICENSE("GPL");
Commit	Line	Data
864fe73c HCE	1	/*
	2	* Atmel AT91 and AVR32 continuous touch screen driver for Wolfson WM97xx AC97
	3	* codecs.
	4	*
	5	* Copyright (C) 2008 - 2009 Atmel Corporation
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License version 2 as published by
	9	* the Free Software Foundation.
	10	*/
	11	#include <linux/module.h>
	12	#include <linux/moduleparam.h>
	13	#include <linux/kernel.h>
	14	#include <linux/init.h>
	15	#include <linux/delay.h>
	16	#include <linux/irq.h>
	17	#include <linux/interrupt.h>
	18	#include <linux/wm97xx.h>
	19	#include <linux/timer.h>
	20	#include <linux/gpio.h>
	21	#include <linux/io.h>
5a0e3ad6	22	#include <linux/slab.h>
864fe73c HCE	23
	24	#define AC97C_ICA 0x10
	25	#define AC97C_CBRHR 0x30
	26	#define AC97C_CBSR 0x38
	27	#define AC97C_CBMR 0x3c
	28	#define AC97C_IER 0x54
	29	#define AC97C_IDR 0x58
	30
	31	#define AC97C_RXRDY (1 << 4)
	32	#define AC97C_OVRUN (1 << 5)
	33
	34	#define AC97C_CMR_SIZE_20 (0 << 16)
	35	#define AC97C_CMR_SIZE_18 (1 << 16)
	36	#define AC97C_CMR_SIZE_16 (2 << 16)
	37	#define AC97C_CMR_SIZE_10 (3 << 16)
	38	#define AC97C_CMR_CEM_LITTLE (1 << 18)
	39	#define AC97C_CMR_CEM_BIG (0 << 18)
	40	#define AC97C_CMR_CENA (1 << 21)
	41
	42	#define AC97C_INT_CBEVT (1 << 4)
	43
	44	#define AC97C_SR_CAEVT (1 << 3)
	45
	46	#define AC97C_CH_MASK(slot) \
	47	(0x7 << (3 * (slot - 3)))
	48	#define AC97C_CH_ASSIGN(slot, channel) \
	49	(AC97C_CHANNEL_##channel << (3 * (slot - 3)))
	50	#define AC97C_CHANNEL_NONE 0x0
	51	#define AC97C_CHANNEL_B 0x2
	52
	53	#define ac97c_writel(chip, reg, val) \
	54	__raw_writel((val), (chip)->regs + AC97C_##reg)
	55	#define ac97c_readl(chip, reg) \
	56	__raw_readl((chip)->regs + AC97C_##reg)
	57
	58	#ifdef CONFIG_CPU_AT32AP700X
	59	#define ATMEL_WM97XX_AC97C_IOMEM (0xfff02800)
	60	#define ATMEL_WM97XX_AC97C_IRQ (29)
	61	#define ATMEL_WM97XX_GPIO_DEFAULT (32+16) /* Pin 16 on port B. */
	62	#else
af901ca1	63	#error Unknown CPU, this driver only supports AT32AP700X CPUs.
864fe73c HCE	64	#endif
	65
	66	struct continuous {
	67	u16 id; /* codec id */
	68	u8 code; /* continuous code */
	69	u8 reads; /* number of coord reads per read cycle */
	70	u32 speed; /* number of coords per second */
	71	};
	72
	73	#define WM_READS(sp) ((sp / HZ) + 1)
	74
	75	static const struct continuous cinfo[] = {
	76	{WM9705_ID2, 0, WM_READS(94), 94},
	77	{WM9705_ID2, 1, WM_READS(188), 188},
	78	{WM9705_ID2, 2, WM_READS(375), 375},
	79	{WM9705_ID2, 3, WM_READS(750), 750},
	80	{WM9712_ID2, 0, WM_READS(94), 94},
	81	{WM9712_ID2, 1, WM_READS(188), 188},
	82	{WM9712_ID2, 2, WM_READS(375), 375},
	83	{WM9712_ID2, 3, WM_READS(750), 750},
	84	{WM9713_ID2, 0, WM_READS(94), 94},
	85	{WM9713_ID2, 1, WM_READS(120), 120},
	86	{WM9713_ID2, 2, WM_READS(154), 154},
	87	{WM9713_ID2, 3, WM_READS(188), 188},
	88	};
	89
	90	/* Continuous speed index. */
	91	static int sp_idx;
	92
	93	/*
	94	* Pen sampling frequency (Hz) in continuous mode.
	95	*/
	96	static int cont_rate = 188;
	97	module_param(cont_rate, int, 0);
	98	MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)");
	99
	100	/*
	101	* Pen down detection.
	102	*
	103	* This driver can either poll or use an interrupt to indicate a pen down
	104	* event. If the irq request fails then it will fall back to polling mode.
	105	*/
	106	static int pen_int = 1;
	107	module_param(pen_int, int, 0);
	108	MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)");
	109
	110	/*
	111	* Pressure readback.
	112	*
	113	* Set to 1 to read back pen down pressure.
	114	*/
	115	static int pressure;
	116	module_param(pressure, int, 0);
	117	MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)");
	118
	119	/*
	120	* AC97 touch data slot.
	121	*
	122	* Touch screen readback data ac97 slot.
	123	*/
	124	static int ac97_touch_slot = 5;
	125	module_param(ac97_touch_slot, int, 0);
	126	MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");
	127
128	/*
129	* GPIO line number.
130	*
131	* Set to GPIO number where the signal from the WM97xx device is hooked up.
132	*/
133	static int atmel_gpio_line = ATMEL_WM97XX_GPIO_DEFAULT;
134	module_param(atmel_gpio_line, int, 0);
135	MODULE_PARM_DESC(atmel_gpio_line, "GPIO line number connected to WM97xx");
136
137	struct atmel_wm97xx {
138	struct wm97xx *wm;
139	struct timer_list pen_timer;
140	void __iomem *regs;
141	unsigned long ac97c_irq;
142	unsigned long gpio_pen;
143	unsigned long gpio_irq;
144	unsigned short x;
145	unsigned short y;
146	};
147
148	static irqreturn_t atmel_wm97xx_channel_b_interrupt(int irq, void *dev_id)
149	{
150	struct atmel_wm97xx *atmel_wm97xx = dev_id;
151	struct wm97xx *wm = atmel_wm97xx->wm;
152	int status = ac97c_readl(atmel_wm97xx, CBSR);
153	irqreturn_t retval = IRQ_NONE;
154
155	if (status & AC97C_OVRUN) {
156	dev_dbg(&wm->touch_dev->dev, "AC97C overrun\n");
157	ac97c_readl(atmel_wm97xx, CBRHR);
158	retval = IRQ_HANDLED;
159	} else if (status & AC97C_RXRDY) {
160	u16 data;
161	u16 value;
162	u16 source;
163	u16 pen_down;
164
165	data = ac97c_readl(atmel_wm97xx, CBRHR);
166	value = data & 0x0fff;
167	source = data & WM97XX_ADCSRC_MASK;
168	pen_down = (data & WM97XX_PEN_DOWN) >> 8;
169
170	if (source == WM97XX_ADCSEL_X)
171	atmel_wm97xx->x = value;
172	if (source == WM97XX_ADCSEL_Y)
173	atmel_wm97xx->y = value;
174
175	if (!pressure && source == WM97XX_ADCSEL_Y) {
176	input_report_abs(wm->input_dev, ABS_X, atmel_wm97xx->x);
177	input_report_abs(wm->input_dev, ABS_Y, atmel_wm97xx->y);
178	input_report_key(wm->input_dev, BTN_TOUCH, pen_down);
179	input_sync(wm->input_dev);
180	} else if (pressure && source == WM97XX_ADCSEL_PRES) {
181	input_report_abs(wm->input_dev, ABS_X, atmel_wm97xx->x);
182	input_report_abs(wm->input_dev, ABS_Y, atmel_wm97xx->y);
183	input_report_abs(wm->input_dev, ABS_PRESSURE, value);
184	input_report_key(wm->input_dev, BTN_TOUCH, value);
185	input_sync(wm->input_dev);
186	}
187
188	retval = IRQ_HANDLED;
189	}
190
191	return retval;
192	}
193
194	static void atmel_wm97xx_acc_pen_up(struct wm97xx *wm)
195	{
196	struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(wm->touch_dev);
197	struct input_dev *input_dev = wm->input_dev;
198	int pen_down = gpio_get_value(atmel_wm97xx->gpio_pen);
199
200	if (pen_down != 0) {
201	mod_timer(&atmel_wm97xx->pen_timer,
202	jiffies + msecs_to_jiffies(1));
203	} else {
204	if (pressure)
205	input_report_abs(input_dev, ABS_PRESSURE, 0);
206	input_report_key(input_dev, BTN_TOUCH, 0);
207	input_sync(input_dev);
208	}
209	}
210
211	static void atmel_wm97xx_pen_timer(unsigned long data)
212	{
213	atmel_wm97xx_acc_pen_up((struct wm97xx *)data);
214	}
215
216	static int atmel_wm97xx_acc_startup(struct wm97xx *wm)
217	{
218	struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(wm->touch_dev);
219	int idx = 0;
220
221	if (wm->ac97 == NULL)
222	return -ENODEV;
223
224	for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) {
225	if (wm->id != cinfo[idx].id)
226	continue;
227
228	sp_idx = idx;
229
230	if (cont_rate <= cinfo[idx].speed)
231	break;
232	}
233
234	wm->acc_rate = cinfo[sp_idx].code;
235	wm->acc_slot = ac97_touch_slot;
236	dev_info(&wm->touch_dev->dev, "atmel accelerated touchscreen driver, "
237	"%d samples/sec\n", cinfo[sp_idx].speed);
238
239	if (pen_int) {
240	unsigned long reg;
241
242	wm->pen_irq = atmel_wm97xx->gpio_irq;
243
244	switch (wm->id) {
245	case WM9712_ID2: /* Fall through. */
246	case WM9713_ID2:
247	/*
248	* Use GPIO 13 (PEN_DOWN) to assert GPIO line 3
249	* (PENDOWN).
250	*/
251	wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN,
252	WM97XX_GPIO_POL_HIGH,
253	WM97XX_GPIO_STICKY,
254	WM97XX_GPIO_WAKE);
255	wm97xx_config_gpio(wm, WM97XX_GPIO_3, WM97XX_GPIO_OUT,
256	WM97XX_GPIO_POL_HIGH,
257	WM97XX_GPIO_NOTSTICKY,
258	WM97XX_GPIO_NOWAKE);
259	case WM9705_ID2: /* Fall through. */
260	/*
261	* Enable touch data slot in AC97 controller channel B.
262	*/
263	reg = ac97c_readl(atmel_wm97xx, ICA);
264	reg &= ~AC97C_CH_MASK(wm->acc_slot);
265	reg \|= AC97C_CH_ASSIGN(wm->acc_slot, B);
266	ac97c_writel(atmel_wm97xx, ICA, reg);
267
268	/*
269	* Enable channel and interrupt for RXRDY and OVERRUN.
270	*/
271	ac97c_writel(atmel_wm97xx, CBMR, AC97C_CMR_CENA
272	\| AC97C_CMR_CEM_BIG
273	\| AC97C_CMR_SIZE_16
274	\| AC97C_OVRUN
275	\| AC97C_RXRDY);
276	/* Dummy read to empty RXRHR. */
277	ac97c_readl(atmel_wm97xx, CBRHR);
278	/*
279	* Enable interrupt for channel B in the AC97
280	* controller.
281	*/
282	ac97c_writel(atmel_wm97xx, IER, AC97C_INT_CBEVT);
283	break;
284	default:
285	dev_err(&wm->touch_dev->dev, "pen down irq not "
286	"supported on this device\n");
287	pen_int = 0;
288	break;
289	}
290	}
291
292	return 0;
293	}
294
295	static void atmel_wm97xx_acc_shutdown(struct wm97xx *wm)
296	{
297	if (pen_int) {
298	struct atmel_wm97xx *atmel_wm97xx =
299	platform_get_drvdata(wm->touch_dev);
300	unsigned long ica;
301
302	switch (wm->id & 0xffff) {
303	case WM9705_ID2: /* Fall through. */
304	case WM9712_ID2: /* Fall through. */
305	case WM9713_ID2:
306	/* Disable slot and turn off channel B interrupts. */
307	ica = ac97c_readl(atmel_wm97xx, ICA);
308	ica &= ~AC97C_CH_MASK(wm->acc_slot);
309	ac97c_writel(atmel_wm97xx, ICA, ica);
310	ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT);
311	ac97c_writel(atmel_wm97xx, CBMR, 0);
312	wm->pen_irq = 0;
313	break;
314	default:
315	dev_err(&wm->touch_dev->dev, "unknown codec\n");
316	break;
317	}
318	}
319	}
320
321	static void atmel_wm97xx_irq_enable(struct wm97xx *wm, int enable)
322	{
323	/* Intentionally left empty. */
324	}
325
326	static struct wm97xx_mach_ops atmel_mach_ops = {
327	.acc_enabled = 1,
328	.acc_pen_up = atmel_wm97xx_acc_pen_up,
329	.acc_startup = atmel_wm97xx_acc_startup,
330	.acc_shutdown = atmel_wm97xx_acc_shutdown,
331	.irq_enable = atmel_wm97xx_irq_enable,
332	.irq_gpio = WM97XX_GPIO_3,
333	};
334
335	static int __init atmel_wm97xx_probe(struct platform_device *pdev)
336	{
337	struct wm97xx *wm = platform_get_drvdata(pdev);
338	struct atmel_wm97xx *atmel_wm97xx;
339	int ret;
340
341	atmel_wm97xx = kzalloc(sizeof(struct atmel_wm97xx), GFP_KERNEL);
342	if (!atmel_wm97xx) {
343	dev_dbg(&pdev->dev, "out of memory\n");
344	return -ENOMEM;
345	}
346
347	atmel_wm97xx->wm = wm;
348	atmel_wm97xx->regs = (void *)ATMEL_WM97XX_AC97C_IOMEM;
349	atmel_wm97xx->ac97c_irq = ATMEL_WM97XX_AC97C_IRQ;
350	atmel_wm97xx->gpio_pen = atmel_gpio_line;
351	atmel_wm97xx->gpio_irq = gpio_to_irq(atmel_wm97xx->gpio_pen);
352
353	setup_timer(&atmel_wm97xx->pen_timer, atmel_wm97xx_pen_timer,
354	(unsigned long)wm);
355
356	ret = request_irq(atmel_wm97xx->ac97c_irq,
357	atmel_wm97xx_channel_b_interrupt,
358	IRQF_SHARED, "atmel-wm97xx-ch-b", atmel_wm97xx);
359	if (ret) {
360	dev_dbg(&pdev->dev, "could not request ac97c irq\n");
361	goto err;
362	}
363
364	platform_set_drvdata(pdev, atmel_wm97xx);
365
366	ret = wm97xx_register_mach_ops(wm, &atmel_mach_ops);
367	if (ret)
368	goto err_irq;
369
370	return ret;
371
372	err_irq:
373	free_irq(atmel_wm97xx->ac97c_irq, atmel_wm97xx);
374	err:
375	platform_set_drvdata(pdev, NULL);
376	kfree(atmel_wm97xx);
377	return ret;
378	}
379
380	static int __exit atmel_wm97xx_remove(struct platform_device *pdev)
381	{
382	struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);
383	struct wm97xx *wm = atmel_wm97xx->wm;
384
385	ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT);
386	free_irq(atmel_wm97xx->ac97c_irq, atmel_wm97xx);
387	del_timer_sync(&atmel_wm97xx->pen_timer);
388	wm97xx_unregister_mach_ops(wm);
389	platform_set_drvdata(pdev, NULL);
390	kfree(atmel_wm97xx);
391
392	return 0;
393	}
394
395	#ifdef CONFIG_PM
396	static int atmel_wm97xx_suspend(struct platform_device *pdev, pm_message_t msg)
397	{
398	struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);
399
400	ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT);
401	disable_irq(atmel_wm97xx->gpio_irq);
402	del_timer_sync(&atmel_wm97xx->pen_timer);
403
404	return 0;
405	}
406
407	static int atmel_wm97xx_resume(struct platform_device *pdev)
408	{
409	struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);
410	struct wm97xx *wm = atmel_wm97xx->wm;
411
412	if (wm->input_dev->users) {
413	enable_irq(atmel_wm97xx->gpio_irq);
414	ac97c_writel(atmel_wm97xx, IER, AC97C_INT_CBEVT);
415	}
416
417	return 0;
418	}
419	#else
420	#define atmel_wm97xx_suspend NULL
421	#define atmel_wm97xx_resume NULL
422	#endif
423
424	static struct platform_driver atmel_wm97xx_driver = {
425	.remove = __exit_p(atmel_wm97xx_remove),
426	.driver = {
427	.name = "wm97xx-touch",
428	},
429	.suspend = atmel_wm97xx_suspend,
430	.resume = atmel_wm97xx_resume,
431	};
432
433	static int __init atmel_wm97xx_init(void)
434	{
435	return platform_driver_probe(&atmel_wm97xx_driver, atmel_wm97xx_probe);
436	}
437	module_init(atmel_wm97xx_init);
438
439	static void __exit atmel_wm97xx_exit(void)
440	{
441	platform_driver_unregister(&atmel_wm97xx_driver);
442	}
443	module_exit(atmel_wm97xx_exit);
444
445	MODULE_AUTHOR("Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>");
446	MODULE_DESCRIPTION("wm97xx continuous touch driver for Atmel AT91 and AVR32");
447	MODULE_LICENSE("GPL");