[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/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 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 = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ts),
				 GFP_KERNEL);
	input_dev = devm_input_allocate_device(&pdev->dev);
	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:

	return error;
}

static 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);

	return 0;
}

static struct platform_driver wm831x_ts_driver = {
	.driver = {
		.name = "wm831x-touch",
	},
	.probe = wm831x_ts_probe,
	.remove = 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>
00cfa730 MB	16	#include <linux/string.h>
	17	#include <linux/pm.h>
	18	#include <linux/input.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/io.h>
	21	#include <linux/mfd/wm831x/core.h>
	22	#include <linux/mfd/wm831x/irq.h>
	23	#include <linux/mfd/wm831x/pdata.h>
	24	#include <linux/platform_device.h>
	25	#include <linux/slab.h>
	26	#include <linux/types.h>
	27
	28	/*
	29	* R16424 (0x4028) - Touch Control 1
	30	*/
	31	#define WM831X_TCH_ENA 0x8000 /* TCH_ENA */
	32	#define WM831X_TCH_CVT_ENA 0x4000 /* TCH_CVT_ENA */
	33	#define WM831X_TCH_SLPENA 0x1000 /* TCH_SLPENA */
	34	#define WM831X_TCH_Z_ENA 0x0400 /* TCH_Z_ENA */
	35	#define WM831X_TCH_Y_ENA 0x0200 /* TCH_Y_ENA */
	36	#define WM831X_TCH_X_ENA 0x0100 /* TCH_X_ENA */
	37	#define WM831X_TCH_DELAY_MASK 0x00E0 /* TCH_DELAY - [7:5] */
	38	#define WM831X_TCH_DELAY_SHIFT 5 /* TCH_DELAY - [7:5] */
	39	#define WM831X_TCH_DELAY_WIDTH 3 /* TCH_DELAY - [7:5] */
	40	#define WM831X_TCH_RATE_MASK 0x001F /* TCH_RATE - [4:0] */
	41	#define WM831X_TCH_RATE_SHIFT 0 /* TCH_RATE - [4:0] */
	42	#define WM831X_TCH_RATE_WIDTH 5 /* TCH_RATE - [4:0] */
	43
	44	/*
	45	* R16425 (0x4029) - Touch Control 2
	46	*/
	47	#define WM831X_TCH_PD_WK 0x2000 /* TCH_PD_WK */
	48	#define WM831X_TCH_5WIRE 0x1000 /* TCH_5WIRE */
	49	#define WM831X_TCH_PDONLY 0x0800 /* TCH_PDONLY */
	50	#define WM831X_TCH_ISEL 0x0100 /* TCH_ISEL */
	51	#define WM831X_TCH_RPU_MASK 0x000F /* TCH_RPU - [3:0] */
	52	#define WM831X_TCH_RPU_SHIFT 0 /* TCH_RPU - [3:0] */
	53	#define WM831X_TCH_RPU_WIDTH 4 /* TCH_RPU - [3:0] */
	54
	55	/*
	56	* R16426-8 (0x402A-C) - Touch Data X/Y/X
	57	*/
	58	#define WM831X_TCH_PD 0x8000 /* TCH_PD1 */
	59	#define WM831X_TCH_DATA_MASK 0x0FFF /* TCH_DATA - [11:0] */
	60	#define WM831X_TCH_DATA_SHIFT 0 /* TCH_DATA - [11:0] */
	61	#define WM831X_TCH_DATA_WIDTH 12 /* TCH_DATA - [11:0] */
	62
	63	struct wm831x_ts {
	64	struct input_dev *input_dev;
	65	struct wm831x *wm831x;
	66	unsigned int data_irq;
	67	unsigned int pd_irq;
	68	bool pressure;
	69	bool pen_down;
f5346668	70	struct work_struct pd_data_work;
00cfa730 MB	71	};
00cfa730 MB	72
f5346668 MB	73	static void wm831x_pd_data_work(struct work_struct *work)
	74	{
	75	struct wm831x_ts *wm831x_ts =
	76	container_of(work, struct wm831x_ts, pd_data_work);
	77
	78	if (wm831x_ts->pen_down) {
	79	enable_irq(wm831x_ts->data_irq);
	80	dev_dbg(wm831x_ts->wm831x->dev, "IRQ PD->DATA done\n");
	81	} else {
	82	enable_irq(wm831x_ts->pd_irq);
	83	dev_dbg(wm831x_ts->wm831x->dev, "IRQ DATA->PD done\n");
	84	}
	85	}
	86
00cfa730 MB	87	static irqreturn_t wm831x_ts_data_irq(int irq, void *irq_data)
	88	{
	89	struct wm831x_ts *wm831x_ts = irq_data;
	90	struct wm831x *wm831x = wm831x_ts->wm831x;
	91	static int data_types[] = { ABS_X, ABS_Y, ABS_PRESSURE };
	92	u16 data[3];
723d9284	93	int count;
00cfa730 MB	94	int i, ret;
00cfa730 MB	95
723d9284 MB	96	if (wm831x_ts->pressure)
	97	count = 3;
	98	else
	99	count = 2;
	100
00cfa730 MB	101	wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
	102	WM831X_TCHDATA_EINT, WM831X_TCHDATA_EINT);
	103
	104	ret = wm831x_bulk_read(wm831x, WM831X_TOUCH_DATA_X, count,
	105	data);
	106	if (ret != 0) {
	107	dev_err(wm831x->dev, "Failed to read touch data: %d\n",
	108	ret);
	109	return IRQ_NONE;
	110	}
	111
	112	/*
	113	* We get a pen down reading on every reading, report pen up if any
	114	* individual reading does so.
	115	*/
	116	wm831x_ts->pen_down = true;
	117	for (i = 0; i < count; i++) {
	118	if (!(data[i] & WM831X_TCH_PD)) {
	119	wm831x_ts->pen_down = false;
	120	continue;
	121	}
	122	input_report_abs(wm831x_ts->input_dev, data_types[i],
	123	data[i] & WM831X_TCH_DATA_MASK);
	124	}
	125
	126	if (!wm831x_ts->pen_down) {
f5346668 MB	127	/* Switch from data to pen down */
	128	dev_dbg(wm831x->dev, "IRQ DATA->PD\n");
	129
00cfa730 MB	130	disable_irq_nosync(wm831x_ts->data_irq);
	131
	132	/* Don't need data any more */
	133	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
	134	WM831X_TCH_X_ENA \| WM831X_TCH_Y_ENA \|
	135	WM831X_TCH_Z_ENA, 0);
	136
	137	/* Flush any final samples that arrived while reading */
	138	wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
	139	WM831X_TCHDATA_EINT, WM831X_TCHDATA_EINT);
	140
	141	wm831x_bulk_read(wm831x, WM831X_TOUCH_DATA_X, count, data);
	142
	143	if (wm831x_ts->pressure)
	144	input_report_abs(wm831x_ts->input_dev,
	145	ABS_PRESSURE, 0);
	146
	147	input_report_key(wm831x_ts->input_dev, BTN_TOUCH, 0);
f5346668 MB	148
f5346668 MB	149	schedule_work(&wm831x_ts->pd_data_work);
bf283707 MB	150	} else {
bf283707 MB	151	input_report_key(wm831x_ts->input_dev, BTN_TOUCH, 1);
00cfa730 MB	152	}
	153
	154	input_sync(wm831x_ts->input_dev);
	155
	156	return IRQ_HANDLED;
	157	}
	158
	159	static irqreturn_t wm831x_ts_pen_down_irq(int irq, void *irq_data)
	160	{
	161	struct wm831x_ts *wm831x_ts = irq_data;
	162	struct wm831x *wm831x = wm831x_ts->wm831x;
723d9284	163	int ena = 0;
00cfa730	164
f5346668 MB	165	if (wm831x_ts->pen_down)
	166	return IRQ_HANDLED;
	167
	168	disable_irq_nosync(wm831x_ts->pd_irq);
	169
00cfa730	170	/* Start collecting data */
723d9284 MB	171	if (wm831x_ts->pressure)
723d9284 MB	172	ena \|= WM831X_TCH_Z_ENA;
00cfa730 MB	173
	174	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
	175	WM831X_TCH_X_ENA \| WM831X_TCH_Y_ENA \| WM831X_TCH_Z_ENA,
	176	WM831X_TCH_X_ENA \| WM831X_TCH_Y_ENA \| ena);
	177
00cfa730 MB	178	wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
	179	WM831X_TCHPD_EINT, WM831X_TCHPD_EINT);
	180
	181	wm831x_ts->pen_down = true;
f5346668 MB	182
	183	/* Switch from pen down to data */
	184	dev_dbg(wm831x->dev, "IRQ PD->DATA\n");
	185	schedule_work(&wm831x_ts->pd_data_work);
00cfa730 MB	186
	187	return IRQ_HANDLED;
	188	}
	189
	190	static int wm831x_ts_input_open(struct input_dev *idev)
	191	{
	192	struct wm831x_ts *wm831x_ts = input_get_drvdata(idev);
	193	struct wm831x *wm831x = wm831x_ts->wm831x;
	194
	195	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
e7cbb90a MB	196	WM831X_TCH_ENA \| WM831X_TCH_CVT_ENA \|
	197	WM831X_TCH_X_ENA \| WM831X_TCH_Y_ENA \|
	198	WM831X_TCH_Z_ENA, WM831X_TCH_ENA);
00cfa730 MB	199
	200	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
	201	WM831X_TCH_CVT_ENA, WM831X_TCH_CVT_ENA);
	202
	203	return 0;
	204	}
	205
	206	static void wm831x_ts_input_close(struct input_dev *idev)
	207	{
	208	struct wm831x_ts *wm831x_ts = input_get_drvdata(idev);
	209	struct wm831x *wm831x = wm831x_ts->wm831x;
	210
f5346668	211	/* Shut the controller down, disabling all other functionality too */
00cfa730	212	wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
f5346668 MB	213	WM831X_TCH_ENA \| WM831X_TCH_X_ENA \|
f5346668 MB	214	WM831X_TCH_Y_ENA \| WM831X_TCH_Z_ENA, 0);
00cfa730	215
f5346668 MB	216	/* Make sure any pending IRQs are done, the above will prevent
	217	* new ones firing.
	218	*/
	219	synchronize_irq(wm831x_ts->data_irq);
	220	synchronize_irq(wm831x_ts->pd_irq);
	221
	222	/* Make sure the IRQ completion work is quiesced */
43829731	223	flush_work(&wm831x_ts->pd_data_work);
f5346668 MB	224
	225	/* If we ended up with the pen down then make sure we revert back
	226	* to pen detection state for the next time we start up.
	227	*/
	228	if (wm831x_ts->pen_down) {
00cfa730	229	disable_irq(wm831x_ts->data_irq);
f5346668 MB	230	enable_irq(wm831x_ts->pd_irq);
	231	wm831x_ts->pen_down = false;
	232	}
00cfa730 MB	233	}
00cfa730 MB	234
5298cc4c	235	static int wm831x_ts_probe(struct platform_device *pdev)
00cfa730 MB	236	{
	237	struct wm831x_ts *wm831x_ts;
	238	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	239	struct wm831x_pdata *core_pdata = dev_get_platdata(pdev->dev.parent);
723d9284	240	struct wm831x_touch_pdata *pdata = NULL;
00cfa730	241	struct input_dev *input_dev;
acad9853	242	int error, irqf;
00cfa730	243
723d9284 MB	244	if (core_pdata)
	245	pdata = core_pdata->touch;
	246
ef8dee5c MB	247	wm831x_ts = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ts),
ef8dee5c MB	248	GFP_KERNEL);
e7cd0aeb	249	input_dev = devm_input_allocate_device(&pdev->dev);
00cfa730 MB	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:
00cfa730 MB	378
	379	return error;
	380	}
	381
e2619cf7	382	static int wm831x_ts_remove(struct platform_device *pdev)
00cfa730 MB	383	{
	384	struct wm831x_ts *wm831x_ts = platform_get_drvdata(pdev);
	385
	386	free_irq(wm831x_ts->pd_irq, wm831x_ts);
	387	free_irq(wm831x_ts->data_irq, wm831x_ts);
00cfa730	388
00cfa730 MB	389	return 0;
	390	}
	391
	392	static struct platform_driver wm831x_ts_driver = {
	393	.driver = {
	394	.name = "wm831x-touch",
00cfa730 MB	395	},
00cfa730 MB	396	.probe = wm831x_ts_probe,
1cb0aa88	397	.remove = wm831x_ts_remove,
00cfa730	398	};
cdcc96e2	399	module_platform_driver(wm831x_ts_driver);
00cfa730 MB	400
	401	/* Module information */
	402	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	403	MODULE_DESCRIPTION("WM831x PMIC touchscreen driver");
	404	MODULE_LICENSE("GPL");
	405	MODULE_ALIAS("platform:wm831x-touch");