[mirror_ubuntu-bionic-kernel.git] / drivers / input / touchscreen / s3c2410_ts.c

/*
 * Samsung S3C24XX touchscreen driver
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the term 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Copyright 2004 Arnaud Patard <arnaud.patard@rtp-net.org>
 * Copyright 2008 Ben Dooks <ben-linux@fluff.org>
 * Copyright 2009 Simtec Electronics <linux@simtec.co.uk>
 *
 * Additional work by Herbert Pötzl <herbert@13thfloor.at> and
 * Harald Welte <laforge@openmoko.org>
 */

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/input.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/io.h>

#include <plat/adc.h>
#include <plat/regs-adc.h>
#include <linux/platform_data/touchscreen-s3c2410.h>

#define TSC_SLEEP  (S3C2410_ADCTSC_PULL_UP_DISABLE | S3C2410_ADCTSC_XY_PST(0))

#define INT_DOWN	(0)
#define INT_UP		(1 << 8)

#define WAIT4INT	(S3C2410_ADCTSC_YM_SEN | \
			 S3C2410_ADCTSC_YP_SEN | \
			 S3C2410_ADCTSC_XP_SEN | \
			 S3C2410_ADCTSC_XY_PST(3))

#define AUTOPST		(S3C2410_ADCTSC_YM_SEN | \
			 S3C2410_ADCTSC_YP_SEN | \
			 S3C2410_ADCTSC_XP_SEN | \
			 S3C2410_ADCTSC_AUTO_PST | \
			 S3C2410_ADCTSC_XY_PST(0))

#define FEAT_PEN_IRQ	(1 << 0)	/* HAS ADCCLRINTPNDNUP */

/* Per-touchscreen data. */

/**
 * struct s3c2410ts - driver touchscreen state.
 * @client: The ADC client we registered with the core driver.
 * @dev: The device we are bound to.
 * @input: The input device we registered with the input subsystem.
 * @clock: The clock for the adc.
 * @io: Pointer to the IO base.
 * @xp: The accumulated X position data.
 * @yp: The accumulated Y position data.
 * @irq_tc: The interrupt number for pen up/down interrupt
 * @count: The number of samples collected.
 * @shift: The log2 of the maximum count to read in one go.
 * @features: The features supported by the TSADC MOdule.
 */
struct s3c2410ts {
	struct s3c_adc_client *client;
	struct device *dev;
	struct input_dev *input;
	struct clk *clock;
	void __iomem *io;
	unsigned long xp;
	unsigned long yp;
	int irq_tc;
	int count;
	int shift;
	int features;
};

static struct s3c2410ts ts;

/**
 * get_down - return the down state of the pen
 * @data0: The data read from ADCDAT0 register.
 * @data1: The data read from ADCDAT1 register.
 *
 * Return non-zero if both readings show that the pen is down.
 */
static inline bool get_down(unsigned long data0, unsigned long data1)
{
	/* returns true if both data values show stylus down */
	return (!(data0 & S3C2410_ADCDAT0_UPDOWN) &&
		!(data1 & S3C2410_ADCDAT0_UPDOWN));
}

static void touch_timer_fire(unsigned long data)
{
	unsigned long data0;
	unsigned long data1;
	bool down;

	data0 = readl(ts.io + S3C2410_ADCDAT0);
	data1 = readl(ts.io + S3C2410_ADCDAT1);

	down = get_down(data0, data1);

	if (down) {
		if (ts.count == (1 << ts.shift)) {
			ts.xp >>= ts.shift;
			ts.yp >>= ts.shift;

			dev_dbg(ts.dev, "%s: X=%lu, Y=%lu, count=%d\n",
				__func__, ts.xp, ts.yp, ts.count);

			input_report_abs(ts.input, ABS_X, ts.xp);
			input_report_abs(ts.input, ABS_Y, ts.yp);

			input_report_key(ts.input, BTN_TOUCH, 1);
			input_sync(ts.input);

			ts.xp = 0;
			ts.yp = 0;
			ts.count = 0;
		}

		s3c_adc_start(ts.client, 0, 1 << ts.shift);
	} else {
		ts.xp = 0;
		ts.yp = 0;
		ts.count = 0;

		input_report_key(ts.input, BTN_TOUCH, 0);
		input_sync(ts.input);

		writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC);
	}
}

static DEFINE_TIMER(touch_timer, touch_timer_fire, 0, 0);

/**
 * stylus_irq - touchscreen stylus event interrupt
 * @irq: The interrupt number
 * @dev_id: The device ID.
 *
 * Called when the IRQ_TC is fired for a pen up or down event.
 */
static irqreturn_t stylus_irq(int irq, void *dev_id)
{
	unsigned long data0;
	unsigned long data1;
	bool down;

	data0 = readl(ts.io + S3C2410_ADCDAT0);
	data1 = readl(ts.io + S3C2410_ADCDAT1);

	down = get_down(data0, data1);

	/* TODO we should never get an interrupt with down set while
	 * the timer is running, but maybe we ought to verify that the
	 * timer isn't running anyways. */

	if (down)
		s3c_adc_start(ts.client, 0, 1 << ts.shift);
	else
		dev_dbg(ts.dev, "%s: count=%d\n", __func__, ts.count);

	if (ts.features & FEAT_PEN_IRQ) {
		/* Clear pen down/up interrupt */
		writel(0x0, ts.io + S3C64XX_ADCCLRINTPNDNUP);
	}

	return IRQ_HANDLED;
}

/**
 * s3c24xx_ts_conversion - ADC conversion callback
 * @client: The client that was registered with the ADC core.
 * @data0: The reading from ADCDAT0.
 * @data1: The reading from ADCDAT1.
 * @left: The number of samples left.
 *
 * Called when a conversion has finished.
 */
static void s3c24xx_ts_conversion(struct s3c_adc_client *client,
				  unsigned data0, unsigned data1,
				  unsigned *left)
{
	dev_dbg(ts.dev, "%s: %d,%d\n", __func__, data0, data1);

	ts.xp += data0;
	ts.yp += data1;

	ts.count++;

	/* From tests, it seems that it is unlikely to get a pen-up
	 * event during the conversion process which means we can
	 * ignore any pen-up events with less than the requisite
	 * count done.
	 *
	 * In several thousand conversions, no pen-ups where detected
	 * before count completed.
	 */
}

/**
 * s3c24xx_ts_select - ADC selection callback.
 * @client: The client that was registered with the ADC core.
 * @select: The reason for select.
 *
 * Called when the ADC core selects (or deslects) us as a client.
 */
static void s3c24xx_ts_select(struct s3c_adc_client *client, unsigned select)
{
	if (select) {
		writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST,
		       ts.io + S3C2410_ADCTSC);
	} else {
		mod_timer(&touch_timer, jiffies+1);
		writel(WAIT4INT | INT_UP, ts.io + S3C2410_ADCTSC);
	}
}

/**
 * s3c2410ts_probe - device core probe entry point
 * @pdev: The device we are being bound to.
 *
 * Initialise, find and allocate any resources we need to run and then
 * register with the ADC and input systems.
 */
static int s3c2410ts_probe(struct platform_device *pdev)
{
	struct s3c2410_ts_mach_info *info;
	struct device *dev = &pdev->dev;
	struct input_dev *input_dev;
	struct resource *res;
	int ret = -EINVAL;

	/* Initialise input stuff */
	memset(&ts, 0, sizeof(struct s3c2410ts));

	ts.dev = dev;

	info = dev_get_platdata(&pdev->dev);
	if (!info) {
		dev_err(dev, "no platform data, cannot attach\n");
		return -EINVAL;
	}

	dev_dbg(dev, "initialising touchscreen\n");

	ts.clock = clk_get(dev, "adc");
	if (IS_ERR(ts.clock)) {
		dev_err(dev, "cannot get adc clock source\n");
		return -ENOENT;
	}

	clk_prepare_enable(ts.clock);
	dev_dbg(dev, "got and enabled clocks\n");

	ts.irq_tc = ret = platform_get_irq(pdev, 0);
	if (ret < 0) {
		dev_err(dev, "no resource for interrupt\n");
		goto err_clk;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(dev, "no resource for registers\n");
		ret = -ENOENT;
		goto err_clk;
	}

	ts.io = ioremap(res->start, resource_size(res));
	if (ts.io == NULL) {
		dev_err(dev, "cannot map registers\n");
		ret = -ENOMEM;
		goto err_clk;
	}

	/* inititalise the gpio */
	if (info->cfg_gpio)
		info->cfg_gpio(to_platform_device(ts.dev));

	ts.client = s3c_adc_register(pdev, s3c24xx_ts_select,
				     s3c24xx_ts_conversion, 1);
	if (IS_ERR(ts.client)) {
		dev_err(dev, "failed to register adc client\n");
		ret = PTR_ERR(ts.client);
		goto err_iomap;
	}

	/* Initialise registers */
	if ((info->delay & 0xffff) > 0)
		writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY);

	writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC);

	input_dev = input_allocate_device();
	if (!input_dev) {
		dev_err(dev, "Unable to allocate the input device !!\n");
		ret = -ENOMEM;
		goto err_iomap;
	}

	ts.input = input_dev;
	ts.input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
	ts.input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
	input_set_abs_params(ts.input, ABS_X, 0, 0x3FF, 0, 0);
	input_set_abs_params(ts.input, ABS_Y, 0, 0x3FF, 0, 0);

	ts.input->name = "S3C24XX TouchScreen";
	ts.input->id.bustype = BUS_HOST;
	ts.input->id.vendor = 0xDEAD;
	ts.input->id.product = 0xBEEF;
	ts.input->id.version = 0x0102;

	ts.shift = info->oversampling_shift;
	ts.features = platform_get_device_id(pdev)->driver_data;

	ret = request_irq(ts.irq_tc, stylus_irq, 0,
			  "s3c2410_ts_pen", ts.input);
	if (ret) {
		dev_err(dev, "cannot get TC interrupt\n");
		goto err_inputdev;
	}

	dev_info(dev, "driver attached, registering input device\n");

	/* All went ok, so register to the input system */
	ret = input_register_device(ts.input);
	if (ret < 0) {
		dev_err(dev, "failed to register input device\n");
		ret = -EIO;
		goto err_tcirq;
	}

	return 0;

 err_tcirq:
	free_irq(ts.irq_tc, ts.input);
 err_inputdev:
	input_free_device(ts.input);
 err_iomap:
	iounmap(ts.io);
 err_clk:
	del_timer_sync(&touch_timer);
	clk_put(ts.clock);
	return ret;
}

/**
 * s3c2410ts_remove - device core removal entry point
 * @pdev: The device we are being removed from.
 *
 * Free up our state ready to be removed.
 */
static int s3c2410ts_remove(struct platform_device *pdev)
{
	free_irq(ts.irq_tc, ts.input);
	del_timer_sync(&touch_timer);

	clk_disable_unprepare(ts.clock);
	clk_put(ts.clock);

	input_unregister_device(ts.input);
	iounmap(ts.io);

	return 0;
}

#ifdef CONFIG_PM
static int s3c2410ts_suspend(struct device *dev)
{
	writel(TSC_SLEEP, ts.io + S3C2410_ADCTSC);
	disable_irq(ts.irq_tc);
	clk_disable(ts.clock);

	return 0;
}

static int s3c2410ts_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct s3c2410_ts_mach_info *info = dev_get_platdata(&pdev->dev);

	clk_enable(ts.clock);
	enable_irq(ts.irq_tc);

	/* Initialise registers */
	if ((info->delay & 0xffff) > 0)
		writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY);

	writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC);

	return 0;
}

static const struct dev_pm_ops s3c_ts_pmops = {
	.suspend	= s3c2410ts_suspend,
	.resume		= s3c2410ts_resume,
};
#endif

static const struct platform_device_id s3cts_driver_ids[] = {
	{ "s3c2410-ts", 0 },
	{ "s3c2440-ts", 0 },
	{ "s3c64xx-ts", FEAT_PEN_IRQ },
	{ }
};
MODULE_DEVICE_TABLE(platform, s3cts_driver_ids);

static struct platform_driver s3c_ts_driver = {
	.driver         = {
		.name   = "samsung-ts",
#ifdef CONFIG_PM
		.pm	= &s3c_ts_pmops,
#endif
	},
	.id_table	= s3cts_driver_ids,
	.probe		= s3c2410ts_probe,
	.remove		= s3c2410ts_remove,
};
module_platform_driver(s3c_ts_driver);

MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, "
	      "Ben Dooks <ben@simtec.co.uk>, "
	      "Simtec Electronics <linux@simtec.co.uk>");
MODULE_DESCRIPTION("S3C24XX Touchscreen driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
f5f96b93 AP	1	/*
	2	* Samsung S3C24XX touchscreen driver
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the term of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	17	*
	18	* Copyright 2004 Arnaud Patard <arnaud.patard@rtp-net.org>
	19	* Copyright 2008 Ben Dooks <ben-linux@fluff.org>
	20	* Copyright 2009 Simtec Electronics <linux@simtec.co.uk>
	21	*
	22	* Additional work by Herbert Pötzl <herbert@13thfloor.at> and
	23	* Harald Welte <laforge@openmoko.org>
	24	*/
	25
	26	#include <linux/errno.h>
	27	#include <linux/kernel.h>
	28	#include <linux/module.h>
f5f96b93 AP	29	#include <linux/gpio.h>
f5f96b93 AP	30	#include <linux/input.h>
f5f96b93 AP	31	#include <linux/delay.h>
	32	#include <linux/interrupt.h>
	33	#include <linux/platform_device.h>
	34	#include <linux/clk.h>
	35	#include <linux/io.h>
	36
	37	#include <plat/adc.h>
	38	#include <plat/regs-adc.h>
436d42c6	39	#include <linux/platform_data/touchscreen-s3c2410.h>
f5f96b93	40
f5f96b93 AP	41	#define TSC_SLEEP (S3C2410_ADCTSC_PULL_UP_DISABLE \| S3C2410_ADCTSC_XY_PST(0))
	42
	43	#define INT_DOWN (0)
	44	#define INT_UP (1 << 8)
	45
	46	#define WAIT4INT (S3C2410_ADCTSC_YM_SEN \| \
	47	S3C2410_ADCTSC_YP_SEN \| \
	48	S3C2410_ADCTSC_XP_SEN \| \
	49	S3C2410_ADCTSC_XY_PST(3))
	50
	51	#define AUTOPST (S3C2410_ADCTSC_YM_SEN \| \
	52	S3C2410_ADCTSC_YP_SEN \| \
	53	S3C2410_ADCTSC_XP_SEN \| \
	54	S3C2410_ADCTSC_AUTO_PST \| \
	55	S3C2410_ADCTSC_XY_PST(0))
	56
91df77d7 NK	57	#define FEAT_PEN_IRQ (1 << 0) /* HAS ADCCLRINTPNDNUP */
91df77d7 NK	58
f5f96b93 AP	59	/* Per-touchscreen data. */
	60
	61	/**
	62	* struct s3c2410ts - driver touchscreen state.
	63	* @client: The ADC client we registered with the core driver.
	64	* @dev: The device we are bound to.
	65	* @input: The input device we registered with the input subsystem.
	66	* @clock: The clock for the adc.
	67	* @io: Pointer to the IO base.
	68	* @xp: The accumulated X position data.
	69	* @yp: The accumulated Y position data.
	70	* @irq_tc: The interrupt number for pen up/down interrupt
	71	* @count: The number of samples collected.
	72	* @shift: The log2 of the maximum count to read in one go.
91df77d7	73	* @features: The features supported by the TSADC MOdule.
f5f96b93 AP	74	*/
	75	struct s3c2410ts {
	76	struct s3c_adc_client *client;
	77	struct device *dev;
	78	struct input_dev *input;
	79	struct clk *clock;
	80	void __iomem *io;
	81	unsigned long xp;
	82	unsigned long yp;
	83	int irq_tc;
	84	int count;
	85	int shift;
91df77d7	86	int features;
f5f96b93 AP	87	};
	88
	89	static struct s3c2410ts ts;
	90
f5f96b93 AP	91	/**
	92	* get_down - return the down state of the pen
	93	* @data0: The data read from ADCDAT0 register.
	94	* @data1: The data read from ADCDAT1 register.
	95	*
	96	* Return non-zero if both readings show that the pen is down.
	97	*/
	98	static inline bool get_down(unsigned long data0, unsigned long data1)
	99	{
	100	/* returns true if both data values show stylus down */
	101	return (!(data0 & S3C2410_ADCDAT0_UPDOWN) &&
	102	!(data1 & S3C2410_ADCDAT0_UPDOWN));
	103	}
	104
	105	static void touch_timer_fire(unsigned long data)
	106	{
	107	unsigned long data0;
	108	unsigned long data1;
	109	bool down;
	110
	111	data0 = readl(ts.io + S3C2410_ADCDAT0);
	112	data1 = readl(ts.io + S3C2410_ADCDAT1);
	113
	114	down = get_down(data0, data1);
	115
23c239be VK	116	if (down) {
	117	if (ts.count == (1 << ts.shift)) {
	118	ts.xp >>= ts.shift;
	119	ts.yp >>= ts.shift;
f5f96b93	120
23c239be VK	121	dev_dbg(ts.dev, "%s: X=%lu, Y=%lu, count=%d\n",
23c239be VK	122	__func__, ts.xp, ts.yp, ts.count);
f5f96b93	123
23c239be VK	124	input_report_abs(ts.input, ABS_X, ts.xp);
23c239be VK	125	input_report_abs(ts.input, ABS_Y, ts.yp);
f5f96b93	126
23c239be VK	127	input_report_key(ts.input, BTN_TOUCH, 1);
23c239be VK	128	input_sync(ts.input);
f5f96b93	129
23c239be VK	130	ts.xp = 0;
	131	ts.yp = 0;
	132	ts.count = 0;
	133	}
f5f96b93	134
f5f96b93 AP	135	s3c_adc_start(ts.client, 0, 1 << ts.shift);
f5f96b93 AP	136	} else {
23c239be VK	137	ts.xp = 0;
23c239be VK	138	ts.yp = 0;
f5f96b93 AP	139	ts.count = 0;
	140
	141	input_report_key(ts.input, BTN_TOUCH, 0);
	142	input_sync(ts.input);
	143
	144	writel(WAIT4INT \| INT_DOWN, ts.io + S3C2410_ADCTSC);
	145	}
	146	}
	147
	148	static DEFINE_TIMER(touch_timer, touch_timer_fire, 0, 0);
	149
	150	/**
	151	* stylus_irq - touchscreen stylus event interrupt
	152	* @irq: The interrupt number
	153	* @dev_id: The device ID.
	154	*
	155	* Called when the IRQ_TC is fired for a pen up or down event.
	156	*/
	157	static irqreturn_t stylus_irq(int irq, void *dev_id)
	158	{
	159	unsigned long data0;
	160	unsigned long data1;
	161	bool down;
	162
	163	data0 = readl(ts.io + S3C2410_ADCDAT0);
	164	data1 = readl(ts.io + S3C2410_ADCDAT1);
	165
	166	down = get_down(data0, data1);
	167
	168	/* TODO we should never get an interrupt with down set while
	169	* the timer is running, but maybe we ought to verify that the
	170	* timer isn't running anyways. */
	171
	172	if (down)
	173	s3c_adc_start(ts.client, 0, 1 << ts.shift);
	174	else
fbf89f25	175	dev_dbg(ts.dev, "%s: count=%d\n", __func__, ts.count);
f5f96b93	176
91df77d7 NK	177	if (ts.features & FEAT_PEN_IRQ) {
	178	/* Clear pen down/up interrupt */
	179	writel(0x0, ts.io + S3C64XX_ADCCLRINTPNDNUP);
	180	}
	181
f5f96b93 AP	182	return IRQ_HANDLED;
	183	}
	184
	185	/**
	186	* s3c24xx_ts_conversion - ADC conversion callback
	187	* @client: The client that was registered with the ADC core.
	188	* @data0: The reading from ADCDAT0.
	189	* @data1: The reading from ADCDAT1.
	190	* @left: The number of samples left.
	191	*
	192	* Called when a conversion has finished.
	193	*/
	194	static void s3c24xx_ts_conversion(struct s3c_adc_client *client,
	195	unsigned data0, unsigned data1,
	196	unsigned *left)
	197	{
	198	dev_dbg(ts.dev, "%s: %d,%d\n", __func__, data0, data1);
	199
	200	ts.xp += data0;
	201	ts.yp += data1;
	202
	203	ts.count++;
	204
	205	/* From tests, it seems that it is unlikely to get a pen-up
	206	* event during the conversion process which means we can
	207	* ignore any pen-up events with less than the requisite
	208	* count done.
	209	*
	210	* In several thousand conversions, no pen-ups where detected
	211	* before count completed.
	212	*/
	213	}
	214
	215	/**
	216	* s3c24xx_ts_select - ADC selection callback.
	217	* @client: The client that was registered with the ADC core.
	218	* @select: The reason for select.
	219	*
	220	* Called when the ADC core selects (or deslects) us as a client.
	221	*/
	222	static void s3c24xx_ts_select(struct s3c_adc_client *client, unsigned select)
	223	{
	224	if (select) {
	225	writel(S3C2410_ADCTSC_PULL_UP_DISABLE \| AUTOPST,
	226	ts.io + S3C2410_ADCTSC);
	227	} else {
	228	mod_timer(&touch_timer, jiffies+1);
	229	writel(WAIT4INT \| INT_UP, ts.io + S3C2410_ADCTSC);
	230	}
	231	}
	232
	233	/**
	234	* s3c2410ts_probe - device core probe entry point
	235	* @pdev: The device we are being bound to.
	236	*
	237	* Initialise, find and allocate any resources we need to run and then
	238	* register with the ADC and input systems.
	239	*/
5298cc4c	240	static int s3c2410ts_probe(struct platform_device *pdev)
f5f96b93 AP	241	{
	242	struct s3c2410_ts_mach_info *info;
	243	struct device *dev = &pdev->dev;
	244	struct input_dev *input_dev;
	245	struct resource *res;
	246	int ret = -EINVAL;
	247
	248	/* Initialise input stuff */
	249	memset(&ts, 0, sizeof(struct s3c2410ts));
	250
	251	ts.dev = dev;
	252
c838cb3d	253	info = dev_get_platdata(&pdev->dev);
f5f96b93 AP	254	if (!info) {
	255	dev_err(dev, "no platform data, cannot attach\n");
	256	return -EINVAL;
	257	}
	258
	259	dev_dbg(dev, "initialising touchscreen\n");
	260
	261	ts.clock = clk_get(dev, "adc");
	262	if (IS_ERR(ts.clock)) {
	263	dev_err(dev, "cannot get adc clock source\n");
	264	return -ENOENT;
	265	}
	266
09c8fb63	267	clk_prepare_enable(ts.clock);
f5f96b93 AP	268	dev_dbg(dev, "got and enabled clocks\n");
	269
	270	ts.irq_tc = ret = platform_get_irq(pdev, 0);
	271	if (ret < 0) {
	272	dev_err(dev, "no resource for interrupt\n");
	273	goto err_clk;
	274	}
	275
	276	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	277	if (!res) {
	278	dev_err(dev, "no resource for registers\n");
	279	ret = -ENOENT;
	280	goto err_clk;
	281	}
	282
	283	ts.io = ioremap(res->start, resource_size(res));
	284	if (ts.io == NULL) {
	285	dev_err(dev, "cannot map registers\n");
	286	ret = -ENOMEM;
	287	goto err_clk;
	288	}
	289
658ad39e NK	290	/* inititalise the gpio */
	291	if (info->cfg_gpio)
	292	info->cfg_gpio(to_platform_device(ts.dev));
f5f96b93 AP	293
	294	ts.client = s3c_adc_register(pdev, s3c24xx_ts_select,
	295	s3c24xx_ts_conversion, 1);
	296	if (IS_ERR(ts.client)) {
	297	dev_err(dev, "failed to register adc client\n");
	298	ret = PTR_ERR(ts.client);
	299	goto err_iomap;
	300	}
	301
	302	/* Initialise registers */
	303	if ((info->delay & 0xffff) > 0)
	304	writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY);
	305
	306	writel(WAIT4INT \| INT_DOWN, ts.io + S3C2410_ADCTSC);
	307
	308	input_dev = input_allocate_device();
	309	if (!input_dev) {
	310	dev_err(dev, "Unable to allocate the input device !!\n");
	311	ret = -ENOMEM;
	312	goto err_iomap;
	313	}
	314
	315	ts.input = input_dev;
	316	ts.input->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
	317	ts.input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
	318	input_set_abs_params(ts.input, ABS_X, 0, 0x3FF, 0, 0);
	319	input_set_abs_params(ts.input, ABS_Y, 0, 0x3FF, 0, 0);
	320
	321	ts.input->name = "S3C24XX TouchScreen";
	322	ts.input->id.bustype = BUS_HOST;
	323	ts.input->id.vendor = 0xDEAD;
	324	ts.input->id.product = 0xBEEF;
	325	ts.input->id.version = 0x0102;
	326
	327	ts.shift = info->oversampling_shift;
91df77d7	328	ts.features = platform_get_device_id(pdev)->driver_data;
f5f96b93	329
ec4665c4	330	ret = request_irq(ts.irq_tc, stylus_irq, 0,
f5f96b93 AP	331	"s3c2410_ts_pen", ts.input);
	332	if (ret) {
	333	dev_err(dev, "cannot get TC interrupt\n");
	334	goto err_inputdev;
	335	}
	336
	337	dev_info(dev, "driver attached, registering input device\n");
	338
	339	/* All went ok, so register to the input system */
	340	ret = input_register_device(ts.input);
	341	if (ret < 0) {
	342	dev_err(dev, "failed to register input device\n");
	343	ret = -EIO;
	344	goto err_tcirq;
	345	}
	346
	347	return 0;
	348
	349	err_tcirq:
	350	free_irq(ts.irq_tc, ts.input);
	351	err_inputdev:
ec1496b3	352	input_free_device(ts.input);
f5f96b93 AP	353	err_iomap:
	354	iounmap(ts.io);
	355	err_clk:
	356	del_timer_sync(&touch_timer);
	357	clk_put(ts.clock);
	358	return ret;
	359	}
	360
	361	/**
	362	* s3c2410ts_remove - device core removal entry point
	363	* @pdev: The device we are being removed from.
	364	*
	365	* Free up our state ready to be removed.
	366	*/
e2619cf7	367	static int s3c2410ts_remove(struct platform_device *pdev)
f5f96b93 AP	368	{
	369	free_irq(ts.irq_tc, ts.input);
	370	del_timer_sync(&touch_timer);
	371
09c8fb63	372	clk_disable_unprepare(ts.clock);
f5f96b93 AP	373	clk_put(ts.clock);
	374
	375	input_unregister_device(ts.input);
	376	iounmap(ts.io);
	377
	378	return 0;
	379	}
	380
	381	#ifdef CONFIG_PM
	382	static int s3c2410ts_suspend(struct device *dev)
	383	{
	384	writel(TSC_SLEEP, ts.io + S3C2410_ADCTSC);
	385	disable_irq(ts.irq_tc);
	386	clk_disable(ts.clock);
	387
	388	return 0;
	389	}
	390
	391	static int s3c2410ts_resume(struct device *dev)
	392	{
	393	struct platform_device *pdev = to_platform_device(dev);
c838cb3d	394	struct s3c2410_ts_mach_info *info = dev_get_platdata(&pdev->dev);
f5f96b93 AP	395
f5f96b93 AP	396	clk_enable(ts.clock);
2f095865	397	enable_irq(ts.irq_tc);
f5f96b93 AP	398
	399	/* Initialise registers */
	400	if ((info->delay & 0xffff) > 0)
	401	writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY);
	402
	403	writel(WAIT4INT \| INT_DOWN, ts.io + S3C2410_ADCTSC);
	404
	405	return 0;
	406	}
	407
bd68dfe0	408	static const struct dev_pm_ops s3c_ts_pmops = {
f5f96b93 AP	409	.suspend = s3c2410ts_suspend,
	410	.resume = s3c2410ts_resume,
	411	};
	412	#endif
	413
3419e49a	414	static const struct platform_device_id s3cts_driver_ids[] = {
03a3f695 VK	415	{ "s3c2410-ts", 0 },
03a3f695 VK	416	{ "s3c2440-ts", 0 },
91df77d7	417	{ "s3c64xx-ts", FEAT_PEN_IRQ },
f5f96b93 AP	418	{ }
	419	};
	420	MODULE_DEVICE_TABLE(platform, s3cts_driver_ids);
	421
	422	static struct platform_driver s3c_ts_driver = {
	423	.driver = {
91df77d7	424	.name = "samsung-ts",
f5f96b93 AP	425	#ifdef CONFIG_PM
	426	.pm = &s3c_ts_pmops,
	427	#endif
	428	},
	429	.id_table = s3cts_driver_ids,
	430	.probe = s3c2410ts_probe,
1cb0aa88	431	.remove = s3c2410ts_remove,
f5f96b93	432	};
cdcc96e2	433	module_platform_driver(s3c_ts_driver);
f5f96b93 AP	434
	435	MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, "
	436	"Ben Dooks <ben@simtec.co.uk>, "
	437	"Simtec Electronics <linux@simtec.co.uk>");
	438	MODULE_DESCRIPTION("S3C24XX Touchscreen driver");
	439	MODULE_LICENSE("GPL v2");