[deliverable/linux.git] / drivers / input / touchscreen / wm831x-ts.c

/*
 * Touchscreen driver for WM831x PMICs
 *
 * Copyright 2011 Wolfson Microelectronics plc.
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/pm.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/irq.h>
#include <linux/mfd/wm831x/pdata.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/types.h>

/*
 * R16424 (0x4028) - Touch Control 1
 */
#define WM831X_TCH_ENA                          0x8000  /* TCH_ENA */
#define WM831X_TCH_CVT_ENA                      0x4000  /* TCH_CVT_ENA */
#define WM831X_TCH_SLPENA                       0x1000  /* TCH_SLPENA */
#define WM831X_TCH_Z_ENA                        0x0400  /* TCH_Z_ENA */
#define WM831X_TCH_Y_ENA                        0x0200  /* TCH_Y_ENA */
#define WM831X_TCH_X_ENA                        0x0100  /* TCH_X_ENA */
#define WM831X_TCH_DELAY_MASK                   0x00E0  /* TCH_DELAY - [7:5] */
#define WM831X_TCH_DELAY_SHIFT                       5  /* TCH_DELAY - [7:5] */
#define WM831X_TCH_DELAY_WIDTH                       3  /* TCH_DELAY - [7:5] */
#define WM831X_TCH_RATE_MASK                    0x001F  /* TCH_RATE - [4:0] */
#define WM831X_TCH_RATE_SHIFT                        0  /* TCH_RATE - [4:0] */
#define WM831X_TCH_RATE_WIDTH                        5  /* TCH_RATE - [4:0] */

/*
 * R16425 (0x4029) - Touch Control 2
 */
#define WM831X_TCH_PD_WK                        0x2000  /* TCH_PD_WK */
#define WM831X_TCH_5WIRE                        0x1000  /* TCH_5WIRE */
#define WM831X_TCH_PDONLY                       0x0800  /* TCH_PDONLY */
#define WM831X_TCH_ISEL                         0x0100  /* TCH_ISEL */
#define WM831X_TCH_RPU_MASK                     0x000F  /* TCH_RPU - [3:0] */
#define WM831X_TCH_RPU_SHIFT                         0  /* TCH_RPU - [3:0] */
#define WM831X_TCH_RPU_WIDTH                         4  /* TCH_RPU - [3:0] */

/*
 * R16426-8 (0x402A-C) - Touch Data X/Y/X
 */
#define WM831X_TCH_PD                           0x8000  /* TCH_PD1 */
#define WM831X_TCH_DATA_MASK                    0x0FFF  /* TCH_DATA - [11:0] */
#define WM831X_TCH_DATA_SHIFT                        0  /* TCH_DATA - [11:0] */
#define WM831X_TCH_DATA_WIDTH                       12  /* TCH_DATA - [11:0] */

struct wm831x_ts {
	struct input_dev *input_dev;
	struct wm831x *wm831x;
	unsigned int data_irq;
	unsigned int pd_irq;
	bool pressure;
	bool pen_down;
	struct work_struct pd_data_work;
};

static void wm831x_pd_data_work(struct work_struct *work)
{
	struct wm831x_ts *wm831x_ts =
		container_of(work, struct wm831x_ts, pd_data_work);

	if (wm831x_ts->pen_down) {
		enable_irq(wm831x_ts->data_irq);
		dev_dbg(wm831x_ts->wm831x->dev, "IRQ PD->DATA done\n");
	} else {
		enable_irq(wm831x_ts->pd_irq);
		dev_dbg(wm831x_ts->wm831x->dev, "IRQ DATA->PD done\n");
	}
}

static irqreturn_t wm831x_ts_data_irq(int irq, void *irq_data)
{
	struct wm831x_ts *wm831x_ts = irq_data;
	struct wm831x *wm831x = wm831x_ts->wm831x;
	static int data_types[] = { ABS_X, ABS_Y, ABS_PRESSURE };
	u16 data[3];
	int count;
	int i, ret;

	if (wm831x_ts->pressure)
		count = 3;
	else
		count = 2;

	wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
			WM831X_TCHDATA_EINT, WM831X_TCHDATA_EINT);

	ret = wm831x_bulk_read(wm831x, WM831X_TOUCH_DATA_X, count,
			       data);
	if (ret != 0) {
		dev_err(wm831x->dev, "Failed to read touch data: %d\n",
			ret);
		return IRQ_NONE;
	}

	/*
	 * We get a pen down reading on every reading, report pen up if any
	 * individual reading does so.
	 */
	wm831x_ts->pen_down = true;
	for (i = 0; i < count; i++) {
		if (!(data[i] & WM831X_TCH_PD)) {
			wm831x_ts->pen_down = false;
			continue;
		}
		input_report_abs(wm831x_ts->input_dev, data_types[i],
				 data[i] & WM831X_TCH_DATA_MASK);
	}

	if (!wm831x_ts->pen_down) {
		/* Switch from data to pen down */
		dev_dbg(wm831x->dev, "IRQ DATA->PD\n");

		disable_irq_nosync(wm831x_ts->data_irq);

		/* Don't need data any more */
		wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
				WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA |
				WM831X_TCH_Z_ENA, 0);

		/* Flush any final samples that arrived while reading */
		wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
				WM831X_TCHDATA_EINT, WM831X_TCHDATA_EINT);

		wm831x_bulk_read(wm831x, WM831X_TOUCH_DATA_X, count, data);

		if (wm831x_ts->pressure)
			input_report_abs(wm831x_ts->input_dev,
					 ABS_PRESSURE, 0);

		input_report_key(wm831x_ts->input_dev, BTN_TOUCH, 0);

		schedule_work(&wm831x_ts->pd_data_work);
	} else {
		input_report_key(wm831x_ts->input_dev, BTN_TOUCH, 1);
	}

	input_sync(wm831x_ts->input_dev);

	return IRQ_HANDLED;
}

static irqreturn_t wm831x_ts_pen_down_irq(int irq, void *irq_data)
{
	struct wm831x_ts *wm831x_ts = irq_data;
	struct wm831x *wm831x = wm831x_ts->wm831x;
	int ena = 0;

	if (wm831x_ts->pen_down)
		return IRQ_HANDLED;

	disable_irq_nosync(wm831x_ts->pd_irq);

	/* Start collecting data */
	if (wm831x_ts->pressure)
		ena |= WM831X_TCH_Z_ENA;

	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
			WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA | WM831X_TCH_Z_ENA,
			WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA | ena);

	wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
			WM831X_TCHPD_EINT, WM831X_TCHPD_EINT);

	wm831x_ts->pen_down = true;

	/* Switch from pen down to data */
	dev_dbg(wm831x->dev, "IRQ PD->DATA\n");
	schedule_work(&wm831x_ts->pd_data_work);

	return IRQ_HANDLED;
}

static int wm831x_ts_input_open(struct input_dev *idev)
{
	struct wm831x_ts *wm831x_ts = input_get_drvdata(idev);
	struct wm831x *wm831x = wm831x_ts->wm831x;

	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
			WM831X_TCH_ENA | WM831X_TCH_CVT_ENA |
			WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA |
			WM831X_TCH_Z_ENA, WM831X_TCH_ENA);

	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
			WM831X_TCH_CVT_ENA, WM831X_TCH_CVT_ENA);

	return 0;
}

static void wm831x_ts_input_close(struct input_dev *idev)
{
	struct wm831x_ts *wm831x_ts = input_get_drvdata(idev);
	struct wm831x *wm831x = wm831x_ts->wm831x;

	/* Shut the controller down, disabling all other functionality too */
	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
			WM831X_TCH_ENA | WM831X_TCH_X_ENA |
			WM831X_TCH_Y_ENA | WM831X_TCH_Z_ENA, 0);

	/* Make sure any pending IRQs are done, the above will prevent
	 * new ones firing.
	 */
	synchronize_irq(wm831x_ts->data_irq);
	synchronize_irq(wm831x_ts->pd_irq);

	/* Make sure the IRQ completion work is quiesced */
	flush_work(&wm831x_ts->pd_data_work);

	/* If we ended up with the pen down then make sure we revert back
	 * to pen detection state for the next time we start up.
	 */
	if (wm831x_ts->pen_down) {
		disable_irq(wm831x_ts->data_irq);
		enable_irq(wm831x_ts->pd_irq);
		wm831x_ts->pen_down = false;
	}
}

static __devinit int wm831x_ts_probe(struct platform_device *pdev)
{
	struct wm831x_ts *wm831x_ts;
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct wm831x_pdata *core_pdata = dev_get_platdata(pdev->dev.parent);
	struct wm831x_touch_pdata *pdata = NULL;
	struct input_dev *input_dev;
	int error, irqf;

	if (core_pdata)
		pdata = core_pdata->touch;

	wm831x_ts = kzalloc(sizeof(struct wm831x_ts), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!wm831x_ts || !input_dev) {
		error = -ENOMEM;
		goto err_alloc;
	}

	wm831x_ts->wm831x = wm831x;
	wm831x_ts->input_dev = input_dev;
	INIT_WORK(&wm831x_ts->pd_data_work, wm831x_pd_data_work);

	/*
	 * If we have a direct IRQ use it, otherwise use the interrupt
	 * from the WM831x IRQ controller.
	 */
	wm831x_ts->data_irq = wm831x_irq(wm831x,
					 platform_get_irq_byname(pdev,
								 "TCHDATA"));
	if (pdata && pdata->data_irq)
		wm831x_ts->data_irq = pdata->data_irq;

	wm831x_ts->pd_irq = wm831x_irq(wm831x,
				       platform_get_irq_byname(pdev, "TCHPD"));
	if (pdata && pdata->pd_irq)
		wm831x_ts->pd_irq = pdata->pd_irq;

	if (pdata)
		wm831x_ts->pressure = pdata->pressure;
	else
		wm831x_ts->pressure = true;

	/* Five wire touchscreens can't report pressure */
	if (pdata && pdata->fivewire) {
		wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
				WM831X_TCH_5WIRE, WM831X_TCH_5WIRE);

		/* Pressure measurements are not possible for five wire mode */
		WARN_ON(pdata->pressure && pdata->fivewire);
		wm831x_ts->pressure = false;
	} else {
		wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
				WM831X_TCH_5WIRE, 0);
	}

	if (pdata) {
		switch (pdata->isel) {
		default:
			dev_err(&pdev->dev, "Unsupported ISEL setting: %d\n",
				pdata->isel);
			/* Fall through */
		case 200:
		case 0:
			wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
					WM831X_TCH_ISEL, 0);
			break;
		case 400:
			wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
					WM831X_TCH_ISEL, WM831X_TCH_ISEL);
			break;
		}
	}

	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
			WM831X_TCH_PDONLY, 0);

	/* Default to 96 samples/sec */
	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
			WM831X_TCH_RATE_MASK, 6);

	if (pdata && pdata->data_irqf)
		irqf = pdata->data_irqf;
	else
		irqf = IRQF_TRIGGER_HIGH;

	error = request_threaded_irq(wm831x_ts->data_irq,
				     NULL, wm831x_ts_data_irq,
				     irqf | IRQF_ONESHOT,
				     "Touchscreen data", wm831x_ts);
	if (error) {
		dev_err(&pdev->dev, "Failed to request data IRQ %d: %d\n",
			wm831x_ts->data_irq, error);
		goto err_alloc;
	}
	disable_irq(wm831x_ts->data_irq);

	if (pdata && pdata->pd_irqf)
		irqf = pdata->pd_irqf;
	else
		irqf = IRQF_TRIGGER_HIGH;

	error = request_threaded_irq(wm831x_ts->pd_irq,
				     NULL, wm831x_ts_pen_down_irq,
				     irqf | IRQF_ONESHOT,
				     "Touchscreen pen down", wm831x_ts);
	if (error) {
		dev_err(&pdev->dev, "Failed to request pen down IRQ %d: %d\n",
			wm831x_ts->pd_irq, error);
		goto err_data_irq;
	}

	/* set up touch configuration */
	input_dev->name = "WM831x touchscreen";
	input_dev->phys = "wm831x";
	input_dev->open = wm831x_ts_input_open;
	input_dev->close = wm831x_ts_input_close;

	__set_bit(EV_ABS, input_dev->evbit);
	__set_bit(EV_KEY, input_dev->evbit);
	__set_bit(BTN_TOUCH, input_dev->keybit);

	input_set_abs_params(input_dev, ABS_X, 0, 4095, 5, 0);
	input_set_abs_params(input_dev, ABS_Y, 0, 4095, 5, 0);
	if (wm831x_ts->pressure)
		input_set_abs_params(input_dev, ABS_PRESSURE, 0, 4095, 5, 0);

	input_set_drvdata(input_dev, wm831x_ts);
	input_dev->dev.parent = &pdev->dev;

	error = input_register_device(input_dev);
	if (error)
		goto err_pd_irq;

	platform_set_drvdata(pdev, wm831x_ts);
	return 0;

err_pd_irq:
	free_irq(wm831x_ts->pd_irq, wm831x_ts);
err_data_irq:
	free_irq(wm831x_ts->data_irq, wm831x_ts);
err_alloc:
	input_free_device(input_dev);
	kfree(wm831x_ts);

	return error;
}

static __devexit int wm831x_ts_remove(struct platform_device *pdev)
{
	struct wm831x_ts *wm831x_ts = platform_get_drvdata(pdev);

	free_irq(wm831x_ts->pd_irq, wm831x_ts);
	free_irq(wm831x_ts->data_irq, wm831x_ts);
	input_unregister_device(wm831x_ts->input_dev);
	kfree(wm831x_ts);

	platform_set_drvdata(pdev, NULL);
	return 0;
}

static struct platform_driver wm831x_ts_driver = {
	.driver = {
		.name = "wm831x-touch",
		.owner = THIS_MODULE,
	},
	.probe = wm831x_ts_probe,
	.remove = __devexit_p(wm831x_ts_remove),
};
module_platform_driver(wm831x_ts_driver);

/* Module information */
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("WM831x PMIC touchscreen driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm831x-touch");
Commit	Line	Data
00cfa730 MB	1	/*
	2	* Touchscreen driver for WM831x PMICs
	3	*
	4	* Copyright 2011 Wolfson Microelectronics plc.
	5	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	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 as published by the
	9	* Free Software Foundation; either version 2 of the License, or (at your
	10	* option) any later version.
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/moduleparam.h>
	15	#include <linux/kernel.h>
	16	#include <linux/init.h>
	17	#include <linux/string.h>
	18	#include <linux/pm.h>
	19	#include <linux/input.h>
	20	#include <linux/interrupt.h>
	21	#include <linux/io.h>
	22	#include <linux/mfd/wm831x/core.h>
	23	#include <linux/mfd/wm831x/irq.h>
	24	#include <linux/mfd/wm831x/pdata.h>
	25	#include <linux/platform_device.h>
	26	#include <linux/slab.h>
	27	#include <linux/types.h>
	28
	29	/*
	30	* R16424 (0x4028) - Touch Control 1
	31	*/
	32	#define WM831X_TCH_ENA 0x8000 /* TCH_ENA */
	33	#define WM831X_TCH_CVT_ENA 0x4000 /* TCH_CVT_ENA */
	34	#define WM831X_TCH_SLPENA 0x1000 /* TCH_SLPENA */
	35	#define WM831X_TCH_Z_ENA 0x0400 /* TCH_Z_ENA */
	36	#define WM831X_TCH_Y_ENA 0x0200 /* TCH_Y_ENA */
	37	#define WM831X_TCH_X_ENA 0x0100 /* TCH_X_ENA */
	38	#define WM831X_TCH_DELAY_MASK 0x00E0 /* TCH_DELAY - [7:5] */
	39	#define WM831X_TCH_DELAY_SHIFT 5 /* TCH_DELAY - [7:5] */
	40	#define WM831X_TCH_DELAY_WIDTH 3 /* TCH_DELAY - [7:5] */
	41	#define WM831X_TCH_RATE_MASK 0x001F /* TCH_RATE - [4:0] */
	42	#define WM831X_TCH_RATE_SHIFT 0 /* TCH_RATE - [4:0] */
	43	#define WM831X_TCH_RATE_WIDTH 5 /* TCH_RATE - [4:0] */
	44
	45	/*
	46	* R16425 (0x4029) - Touch Control 2
	47	*/
	48	#define WM831X_TCH_PD_WK 0x2000 /* TCH_PD_WK */
	49	#define WM831X_TCH_5WIRE 0x1000 /* TCH_5WIRE */
	50	#define WM831X_TCH_PDONLY 0x0800 /* TCH_PDONLY */
	51	#define WM831X_TCH_ISEL 0x0100 /* TCH_ISEL */
	52	#define WM831X_TCH_RPU_MASK 0x000F /* TCH_RPU - [3:0] */
	53	#define WM831X_TCH_RPU_SHIFT 0 /* TCH_RPU - [3:0] */
	54	#define WM831X_TCH_RPU_WIDTH 4 /* TCH_RPU - [3:0] */
	55
	56	/*
	57	* R16426-8 (0x402A-C) - Touch Data X/Y/X
	58	*/
	59	#define WM831X_TCH_PD 0x8000 /* TCH_PD1 */
	60	#define WM831X_TCH_DATA_MASK 0x0FFF /* TCH_DATA - [11:0] */
	61	#define WM831X_TCH_DATA_SHIFT 0 /* TCH_DATA - [11:0] */
	62	#define WM831X_TCH_DATA_WIDTH 12 /* TCH_DATA - [11:0] */
	63
	64	struct wm831x_ts {
65	struct input_dev *input_dev;
66	struct wm831x *wm831x;
67	unsigned int data_irq;
68	unsigned int pd_irq;
69	bool pressure;
70	bool pen_down;
f5346668	71	struct work_struct pd_data_work;
00cfa730 MB	72	};
00cfa730 MB	73
f5346668 MB	74	static void wm831x_pd_data_work(struct work_struct *work)
	75	{
	76	struct wm831x_ts *wm831x_ts =
	77	container_of(work, struct wm831x_ts, pd_data_work);
	78
	79	if (wm831x_ts->pen_down) {
	80	enable_irq(wm831x_ts->data_irq);
	81	dev_dbg(wm831x_ts->wm831x->dev, "IRQ PD->DATA done\n");
	82	} else {
	83	enable_irq(wm831x_ts->pd_irq);
	84	dev_dbg(wm831x_ts->wm831x->dev, "IRQ DATA->PD done\n");
	85	}
	86	}
	87
00cfa730 MB	88	static irqreturn_t wm831x_ts_data_irq(int irq, void *irq_data)
	89	{
	90	struct wm831x_ts *wm831x_ts = irq_data;
	91	struct wm831x *wm831x = wm831x_ts->wm831x;
	92	static int data_types[] = { ABS_X, ABS_Y, ABS_PRESSURE };
	93	u16 data[3];
723d9284	94	int count;
00cfa730 MB	95	int i, ret;
00cfa730 MB	96
723d9284 MB	97	if (wm831x_ts->pressure)
	98	count = 3;
	99	else
	100	count = 2;
	101
00cfa730 MB	102	wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
	103	WM831X_TCHDATA_EINT, WM831X_TCHDATA_EINT);
	104
	105	ret = wm831x_bulk_read(wm831x, WM831X_TOUCH_DATA_X, count,
	106	data);
	107	if (ret != 0) {
	108	dev_err(wm831x->dev, "Failed to read touch data: %d\n",
	109	ret);
	110	return IRQ_NONE;
	111	}
	112
	113	/*
	114	* We get a pen down reading on every reading, report pen up if any
	115	* individual reading does so.
	116	*/
	117	wm831x_ts->pen_down = true;
	118	for (i = 0; i < count; i++) {
	119	if (!(data[i] & WM831X_TCH_PD)) {
	120	wm831x_ts->pen_down = false;
	121	continue;
	122	}
	123	input_report_abs(wm831x_ts->input_dev, data_types[i],
	124	data[i] & WM831X_TCH_DATA_MASK);
	125	}
	126
	127	if (!wm831x_ts->pen_down) {
f5346668 MB	128	/* Switch from data to pen down */
	129	dev_dbg(wm831x->dev, "IRQ DATA->PD\n");
	130
00cfa730 MB	131	disable_irq_nosync(wm831x_ts->data_irq);
	132
	133	/* Don't need data any more */
	134	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
	135	WM831X_TCH_X_ENA \| WM831X_TCH_Y_ENA \|
	136	WM831X_TCH_Z_ENA, 0);
	137
	138	/* Flush any final samples that arrived while reading */
	139	wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
	140	WM831X_TCHDATA_EINT, WM831X_TCHDATA_EINT);
	141
	142	wm831x_bulk_read(wm831x, WM831X_TOUCH_DATA_X, count, data);
	143
	144	if (wm831x_ts->pressure)
	145	input_report_abs(wm831x_ts->input_dev,
	146	ABS_PRESSURE, 0);
	147
	148	input_report_key(wm831x_ts->input_dev, BTN_TOUCH, 0);
f5346668 MB	149
f5346668 MB	150	schedule_work(&wm831x_ts->pd_data_work);
bf283707 MB	151	} else {
bf283707 MB	152	input_report_key(wm831x_ts->input_dev, BTN_TOUCH, 1);
00cfa730 MB	153	}
	154
	155	input_sync(wm831x_ts->input_dev);
	156
	157	return IRQ_HANDLED;
	158	}
	159
	160	static irqreturn_t wm831x_ts_pen_down_irq(int irq, void *irq_data)
	161	{
	162	struct wm831x_ts *wm831x_ts = irq_data;
	163	struct wm831x *wm831x = wm831x_ts->wm831x;
723d9284	164	int ena = 0;
00cfa730	165
f5346668 MB	166	if (wm831x_ts->pen_down)
	167	return IRQ_HANDLED;
	168
	169	disable_irq_nosync(wm831x_ts->pd_irq);
	170
00cfa730	171	/* Start collecting data */
723d9284 MB	172	if (wm831x_ts->pressure)
723d9284 MB	173	ena \|= WM831X_TCH_Z_ENA;
00cfa730 MB	174
	175	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
	176	WM831X_TCH_X_ENA \| WM831X_TCH_Y_ENA \| WM831X_TCH_Z_ENA,
	177	WM831X_TCH_X_ENA \| WM831X_TCH_Y_ENA \| ena);
	178
00cfa730 MB	179	wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
	180	WM831X_TCHPD_EINT, WM831X_TCHPD_EINT);
	181
	182	wm831x_ts->pen_down = true;
f5346668 MB	183
	184	/* Switch from pen down to data */
	185	dev_dbg(wm831x->dev, "IRQ PD->DATA\n");
	186	schedule_work(&wm831x_ts->pd_data_work);
00cfa730 MB	187
	188	return IRQ_HANDLED;
	189	}
	190
	191	static int wm831x_ts_input_open(struct input_dev *idev)
	192	{
	193	struct wm831x_ts *wm831x_ts = input_get_drvdata(idev);
	194	struct wm831x *wm831x = wm831x_ts->wm831x;
	195
	196	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
e7cbb90a MB	197	WM831X_TCH_ENA \| WM831X_TCH_CVT_ENA \|
	198	WM831X_TCH_X_ENA \| WM831X_TCH_Y_ENA \|
	199	WM831X_TCH_Z_ENA, WM831X_TCH_ENA);
00cfa730 MB	200
	201	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
	202	WM831X_TCH_CVT_ENA, WM831X_TCH_CVT_ENA);
	203
	204	return 0;
	205	}
	206
	207	static void wm831x_ts_input_close(struct input_dev *idev)
	208	{
	209	struct wm831x_ts *wm831x_ts = input_get_drvdata(idev);
	210	struct wm831x *wm831x = wm831x_ts->wm831x;
	211
f5346668	212	/* Shut the controller down, disabling all other functionality too */
00cfa730	213	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
f5346668 MB	214	WM831X_TCH_ENA \| WM831X_TCH_X_ENA \|
f5346668 MB	215	WM831X_TCH_Y_ENA \| WM831X_TCH_Z_ENA, 0);
00cfa730	216
f5346668 MB	217	/* Make sure any pending IRQs are done, the above will prevent
	218	* new ones firing.
	219	*/
	220	synchronize_irq(wm831x_ts->data_irq);
	221	synchronize_irq(wm831x_ts->pd_irq);
	222
	223	/* Make sure the IRQ completion work is quiesced */
43829731	224	flush_work(&wm831x_ts->pd_data_work);
f5346668 MB	225
	226	/* If we ended up with the pen down then make sure we revert back
	227	* to pen detection state for the next time we start up.
	228	*/
	229	if (wm831x_ts->pen_down) {
00cfa730	230	disable_irq(wm831x_ts->data_irq);
f5346668 MB	231	enable_irq(wm831x_ts->pd_irq);
	232	wm831x_ts->pen_down = false;
	233	}
00cfa730 MB	234	}
	235
	236	static __devinit int wm831x_ts_probe(struct platform_device *pdev)
	237	{
	238	struct wm831x_ts *wm831x_ts;
	239	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	240	struct wm831x_pdata *core_pdata = dev_get_platdata(pdev->dev.parent);
723d9284	241	struct wm831x_touch_pdata *pdata = NULL;
00cfa730	242	struct input_dev *input_dev;
acad9853	243	int error, irqf;
00cfa730	244
723d9284 MB	245	if (core_pdata)
	246	pdata = core_pdata->touch;
	247
00cfa730 MB	248	wm831x_ts = kzalloc(sizeof(struct wm831x_ts), GFP_KERNEL);
	249	input_dev = input_allocate_device();
	250	if (!wm831x_ts \|\| !input_dev) {
	251	error = -ENOMEM;
	252	goto err_alloc;
	253	}
	254
	255	wm831x_ts->wm831x = wm831x;
	256	wm831x_ts->input_dev = input_dev;
f5346668	257	INIT_WORK(&wm831x_ts->pd_data_work, wm831x_pd_data_work);
00cfa730 MB	258
	259	/*
	260	* If we have a direct IRQ use it, otherwise use the interrupt
	261	* from the WM831x IRQ controller.
	262	*/
cd99758b MB	263	wm831x_ts->data_irq = wm831x_irq(wm831x,
	264	platform_get_irq_byname(pdev,
	265	"TCHDATA"));
00cfa730 MB	266	if (pdata && pdata->data_irq)
00cfa730 MB	267	wm831x_ts->data_irq = pdata->data_irq;
00cfa730	268
cd99758b MB	269	wm831x_ts->pd_irq = wm831x_irq(wm831x,
cd99758b MB	270	platform_get_irq_byname(pdev, "TCHPD"));
00cfa730 MB	271	if (pdata && pdata->pd_irq)
00cfa730 MB	272	wm831x_ts->pd_irq = pdata->pd_irq;
00cfa730	273
23c483d2 MB	274	if (pdata)
	275	wm831x_ts->pressure = pdata->pressure;
	276	else
	277	wm831x_ts->pressure = true;
00cfa730 MB	278
	279	/* Five wire touchscreens can't report pressure */
	280	if (pdata && pdata->fivewire) {
	281	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
	282	WM831X_TCH_5WIRE, WM831X_TCH_5WIRE);
	283
	284	/* Pressure measurements are not possible for five wire mode */
	285	WARN_ON(pdata->pressure && pdata->fivewire);
	286	wm831x_ts->pressure = false;
	287	} else {
	288	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
	289	WM831X_TCH_5WIRE, 0);
	290	}
	291
	292	if (pdata) {
	293	switch (pdata->isel) {
	294	default:
	295	dev_err(&pdev->dev, "Unsupported ISEL setting: %d\n",
	296	pdata->isel);
	297	/* Fall through */
	298	case 200:
	299	case 0:
	300	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
	301	WM831X_TCH_ISEL, 0);
	302	break;
	303	case 400:
	304	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
	305	WM831X_TCH_ISEL, WM831X_TCH_ISEL);
	306	break;
	307	}
	308	}
	309
	310	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
	311	WM831X_TCH_PDONLY, 0);
	312
	313	/* Default to 96 samples/sec */
	314	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
	315	WM831X_TCH_RATE_MASK, 6);
	316
acad9853 MB	317	if (pdata && pdata->data_irqf)
	318	irqf = pdata->data_irqf;
	319	else
	320	irqf = IRQF_TRIGGER_HIGH;
	321
00cfa730 MB	322	error = request_threaded_irq(wm831x_ts->data_irq,
00cfa730 MB	323	NULL, wm831x_ts_data_irq,
acad9853	324	irqf \| IRQF_ONESHOT,
00cfa730 MB	325	"Touchscreen data", wm831x_ts);
	326	if (error) {
	327	dev_err(&pdev->dev, "Failed to request data IRQ %d: %d\n",
	328	wm831x_ts->data_irq, error);
	329	goto err_alloc;
	330	}
	331	disable_irq(wm831x_ts->data_irq);
	332
acad9853 MB	333	if (pdata && pdata->pd_irqf)
	334	irqf = pdata->pd_irqf;
	335	else
	336	irqf = IRQF_TRIGGER_HIGH;
	337
00cfa730 MB	338	error = request_threaded_irq(wm831x_ts->pd_irq,
00cfa730 MB	339	NULL, wm831x_ts_pen_down_irq,
acad9853	340	irqf \| IRQF_ONESHOT,
00cfa730 MB	341	"Touchscreen pen down", wm831x_ts);
	342	if (error) {
	343	dev_err(&pdev->dev, "Failed to request pen down IRQ %d: %d\n",
	344	wm831x_ts->pd_irq, error);
	345	goto err_data_irq;
	346	}
	347
	348	/* set up touch configuration */
	349	input_dev->name = "WM831x touchscreen";
	350	input_dev->phys = "wm831x";
	351	input_dev->open = wm831x_ts_input_open;
	352	input_dev->close = wm831x_ts_input_close;
	353
	354	__set_bit(EV_ABS, input_dev->evbit);
	355	__set_bit(EV_KEY, input_dev->evbit);
	356	__set_bit(BTN_TOUCH, input_dev->keybit);
	357
	358	input_set_abs_params(input_dev, ABS_X, 0, 4095, 5, 0);
	359	input_set_abs_params(input_dev, ABS_Y, 0, 4095, 5, 0);
	360	if (wm831x_ts->pressure)
	361	input_set_abs_params(input_dev, ABS_PRESSURE, 0, 4095, 5, 0);
	362
	363	input_set_drvdata(input_dev, wm831x_ts);
	364	input_dev->dev.parent = &pdev->dev;
	365
	366	error = input_register_device(input_dev);
	367	if (error)
	368	goto err_pd_irq;
	369
	370	platform_set_drvdata(pdev, wm831x_ts);
	371	return 0;
	372
	373	err_pd_irq:
	374	free_irq(wm831x_ts->pd_irq, wm831x_ts);
	375	err_data_irq:
	376	free_irq(wm831x_ts->data_irq, wm831x_ts);
	377	err_alloc:
	378	input_free_device(input_dev);
	379	kfree(wm831x_ts);
	380
	381	return error;
	382	}
	383
	384	static __devexit int wm831x_ts_remove(struct platform_device *pdev)
	385	{
	386	struct wm831x_ts *wm831x_ts = platform_get_drvdata(pdev);
	387
	388	free_irq(wm831x_ts->pd_irq, wm831x_ts);
	389	free_irq(wm831x_ts->data_irq, wm831x_ts);
	390	input_unregister_device(wm831x_ts->input_dev);
	391	kfree(wm831x_ts);
	392
	393	platform_set_drvdata(pdev, NULL);
	394	return 0;
	395	}
	396
	397	static struct platform_driver wm831x_ts_driver = {
	398	.driver = {
	399	.name = "wm831x-touch",
	400	.owner = THIS_MODULE,
	401	},
	402	.probe = wm831x_ts_probe,
	403	.remove = __devexit_p(wm831x_ts_remove),
	404	};
cdcc96e2	405	module_platform_driver(wm831x_ts_driver);
00cfa730 MB	406
	407	/* Module information */
	408	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	409	MODULE_DESCRIPTION("WM831x PMIC touchscreen driver");
	410	MODULE_LICENSE("GPL");
	411	MODULE_ALIAS("platform:wm831x-touch");