[linux-2.6-block.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/init.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 <plat/ts.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_info(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 __devinit 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 = pdev->dev.platform_data;
	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_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, IRQF_DISABLED,
			  "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_unregister_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 __devexit s3c2410ts_remove(struct platform_device *pdev)
{
	free_irq(ts.irq_tc, ts.input);
	del_timer_sync(&touch_timer);

	clk_disable(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 = pdev->dev.platform_data;

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

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

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

static int __init s3c2410ts_init(void)
{
	return platform_driver_register(&s3c_ts_driver);
}

static void __exit s3c2410ts_exit(void)
{
	platform_driver_unregister(&s3c_ts_driver);
}

module_init(s3c2410ts_init);
module_exit(s3c2410ts_exit);

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>
	30	#include <linux/input.h>
	31	#include <linux/init.h>
	32	#include <linux/delay.h>
	33	#include <linux/interrupt.h>
	34	#include <linux/platform_device.h>
	35	#include <linux/clk.h>
	36	#include <linux/io.h>
	37
	38	#include <plat/adc.h>
	39	#include <plat/regs-adc.h>
73e59b1d	40	#include <plat/ts.h>
f5f96b93	41
f5f96b93 AP	42	#define TSC_SLEEP (S3C2410_ADCTSC_PULL_UP_DISABLE \| S3C2410_ADCTSC_XY_PST(0))
	43
	44	#define INT_DOWN (0)
	45	#define INT_UP (1 << 8)
	46
	47	#define WAIT4INT (S3C2410_ADCTSC_YM_SEN \| \
	48	S3C2410_ADCTSC_YP_SEN \| \
	49	S3C2410_ADCTSC_XP_SEN \| \
	50	S3C2410_ADCTSC_XY_PST(3))
	51
	52	#define AUTOPST (S3C2410_ADCTSC_YM_SEN \| \
	53	S3C2410_ADCTSC_YP_SEN \| \
	54	S3C2410_ADCTSC_XP_SEN \| \
	55	S3C2410_ADCTSC_AUTO_PST \| \
	56	S3C2410_ADCTSC_XY_PST(0))
	57
91df77d7 NK	58	#define FEAT_PEN_IRQ (1 << 0) /* HAS ADCCLRINTPNDNUP */
91df77d7 NK	59
f5f96b93 AP	60	/* Per-touchscreen data. */
	61
	62	/**
	63	* struct s3c2410ts - driver touchscreen state.
	64	* @client: The ADC client we registered with the core driver.
	65	* @dev: The device we are bound to.
	66	* @input: The input device we registered with the input subsystem.
	67	* @clock: The clock for the adc.
	68	* @io: Pointer to the IO base.
	69	* @xp: The accumulated X position data.
	70	* @yp: The accumulated Y position data.
	71	* @irq_tc: The interrupt number for pen up/down interrupt
	72	* @count: The number of samples collected.
	73	* @shift: The log2 of the maximum count to read in one go.
91df77d7	74	* @features: The features supported by the TSADC MOdule.
f5f96b93 AP	75	*/
	76	struct s3c2410ts {
	77	struct s3c_adc_client *client;
	78	struct device *dev;
	79	struct input_dev *input;
	80	struct clk *clock;
	81	void __iomem *io;
	82	unsigned long xp;
	83	unsigned long yp;
	84	int irq_tc;
	85	int count;
	86	int shift;
91df77d7	87	int features;
f5f96b93 AP	88	};
	89
	90	static struct s3c2410ts ts;
	91
f5f96b93 AP	92	/**
	93	* get_down - return the down state of the pen
	94	* @data0: The data read from ADCDAT0 register.
	95	* @data1: The data read from ADCDAT1 register.
	96	*
	97	* Return non-zero if both readings show that the pen is down.
	98	*/
	99	static inline bool get_down(unsigned long data0, unsigned long data1)
	100	{
	101	/* returns true if both data values show stylus down */
	102	return (!(data0 & S3C2410_ADCDAT0_UPDOWN) &&
	103	!(data1 & S3C2410_ADCDAT0_UPDOWN));
	104	}
	105
	106	static void touch_timer_fire(unsigned long data)
	107	{
	108	unsigned long data0;
	109	unsigned long data1;
	110	bool down;
	111
	112	data0 = readl(ts.io + S3C2410_ADCDAT0);
	113	data1 = readl(ts.io + S3C2410_ADCDAT1);
	114
	115	down = get_down(data0, data1);
	116
23c239be VK	117	if (down) {
	118	if (ts.count == (1 << ts.shift)) {
	119	ts.xp >>= ts.shift;
	120	ts.yp >>= ts.shift;
f5f96b93	121
23c239be VK	122	dev_dbg(ts.dev, "%s: X=%lu, Y=%lu, count=%d\n",
23c239be VK	123	__func__, ts.xp, ts.yp, ts.count);
f5f96b93	124
23c239be VK	125	input_report_abs(ts.input, ABS_X, ts.xp);
23c239be VK	126	input_report_abs(ts.input, ABS_Y, ts.yp);
f5f96b93	127
23c239be VK	128	input_report_key(ts.input, BTN_TOUCH, 1);
23c239be VK	129	input_sync(ts.input);
f5f96b93	130
23c239be VK	131	ts.xp = 0;
	132	ts.yp = 0;
	133	ts.count = 0;
	134	}
f5f96b93	135
f5f96b93 AP	136	s3c_adc_start(ts.client, 0, 1 << ts.shift);
f5f96b93 AP	137	} else {
23c239be VK	138	ts.xp = 0;
23c239be VK	139	ts.yp = 0;
f5f96b93 AP	140	ts.count = 0;
	141
	142	input_report_key(ts.input, BTN_TOUCH, 0);
	143	input_sync(ts.input);
	144
	145	writel(WAIT4INT \| INT_DOWN, ts.io + S3C2410_ADCTSC);
	146	}
	147	}
	148
	149	static DEFINE_TIMER(touch_timer, touch_timer_fire, 0, 0);
	150
	151	/**
	152	* stylus_irq - touchscreen stylus event interrupt
	153	* @irq: The interrupt number
	154	* @dev_id: The device ID.
	155	*
	156	* Called when the IRQ_TC is fired for a pen up or down event.
	157	*/
	158	static irqreturn_t stylus_irq(int irq, void *dev_id)
	159	{
	160	unsigned long data0;
	161	unsigned long data1;
	162	bool down;
	163
	164	data0 = readl(ts.io + S3C2410_ADCDAT0);
	165	data1 = readl(ts.io + S3C2410_ADCDAT1);
	166
	167	down = get_down(data0, data1);
	168
	169	/* TODO we should never get an interrupt with down set while
	170	* the timer is running, but maybe we ought to verify that the
	171	* timer isn't running anyways. */
	172
	173	if (down)
	174	s3c_adc_start(ts.client, 0, 1 << ts.shift);
	175	else
	176	dev_info(ts.dev, "%s: count=%d\n", __func__, ts.count);
	177
91df77d7 NK	178	if (ts.features & FEAT_PEN_IRQ) {
	179	/* Clear pen down/up interrupt */
	180	writel(0x0, ts.io + S3C64XX_ADCCLRINTPNDNUP);
	181	}
	182
f5f96b93 AP	183	return IRQ_HANDLED;
	184	}
	185
	186	/**
	187	* s3c24xx_ts_conversion - ADC conversion callback
	188	* @client: The client that was registered with the ADC core.
	189	* @data0: The reading from ADCDAT0.
	190	* @data1: The reading from ADCDAT1.
	191	* @left: The number of samples left.
	192	*
	193	* Called when a conversion has finished.
	194	*/
	195	static void s3c24xx_ts_conversion(struct s3c_adc_client *client,
	196	unsigned data0, unsigned data1,
	197	unsigned *left)
	198	{
	199	dev_dbg(ts.dev, "%s: %d,%d\n", __func__, data0, data1);
	200
	201	ts.xp += data0;
	202	ts.yp += data1;
	203
	204	ts.count++;
	205
	206	/* From tests, it seems that it is unlikely to get a pen-up
	207	* event during the conversion process which means we can
	208	* ignore any pen-up events with less than the requisite
	209	* count done.
	210	*
	211	* In several thousand conversions, no pen-ups where detected
	212	* before count completed.
	213	*/
	214	}
	215
	216	/**
	217	* s3c24xx_ts_select - ADC selection callback.
	218	* @client: The client that was registered with the ADC core.
	219	* @select: The reason for select.
	220	*
	221	* Called when the ADC core selects (or deslects) us as a client.
	222	*/
	223	static void s3c24xx_ts_select(struct s3c_adc_client *client, unsigned select)
	224	{
	225	if (select) {
	226	writel(S3C2410_ADCTSC_PULL_UP_DISABLE \| AUTOPST,
	227	ts.io + S3C2410_ADCTSC);
	228	} else {
	229	mod_timer(&touch_timer, jiffies+1);
	230	writel(WAIT4INT \| INT_UP, ts.io + S3C2410_ADCTSC);
	231	}
	232	}
	233
	234	/**
	235	* s3c2410ts_probe - device core probe entry point
	236	* @pdev: The device we are being bound to.
	237	*
	238	* Initialise, find and allocate any resources we need to run and then
	239	* register with the ADC and input systems.
	240	*/
	241	static int __devinit s3c2410ts_probe(struct platform_device *pdev)
	242	{
	243	struct s3c2410_ts_mach_info *info;
	244	struct device *dev = &pdev->dev;
	245	struct input_dev *input_dev;
	246	struct resource *res;
247	int ret = -EINVAL;
248
249	/* Initialise input stuff */
250	memset(&ts, 0, sizeof(struct s3c2410ts));
251
252	ts.dev = dev;
253
254	info = pdev->dev.platform_data;
255	if (!info) {
256	dev_err(dev, "no platform data, cannot attach\n");
257	return -EINVAL;
258	}
259
260	dev_dbg(dev, "initialising touchscreen\n");
261
262	ts.clock = clk_get(dev, "adc");
263	if (IS_ERR(ts.clock)) {
264	dev_err(dev, "cannot get adc clock source\n");
265	return -ENOENT;
266	}
267
268	clk_enable(ts.clock);
269	dev_dbg(dev, "got and enabled clocks\n");
270
271	ts.irq_tc = ret = platform_get_irq(pdev, 0);
272	if (ret < 0) {
273	dev_err(dev, "no resource for interrupt\n");
274	goto err_clk;
275	}
276
277	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
278	if (!res) {
279	dev_err(dev, "no resource for registers\n");
280	ret = -ENOENT;
281	goto err_clk;
282	}
283
284	ts.io = ioremap(res->start, resource_size(res));
285	if (ts.io == NULL) {
286	dev_err(dev, "cannot map registers\n");
287	ret = -ENOMEM;
288	goto err_clk;
289	}
290
658ad39e NK	291	/* inititalise the gpio */
	292	if (info->cfg_gpio)
	293	info->cfg_gpio(to_platform_device(ts.dev));
f5f96b93 AP	294
	295	ts.client = s3c_adc_register(pdev, s3c24xx_ts_select,
	296	s3c24xx_ts_conversion, 1);
	297	if (IS_ERR(ts.client)) {
	298	dev_err(dev, "failed to register adc client\n");
	299	ret = PTR_ERR(ts.client);
	300	goto err_iomap;
	301	}
	302
	303	/* Initialise registers */
	304	if ((info->delay & 0xffff) > 0)
	305	writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY);
	306
	307	writel(WAIT4INT \| INT_DOWN, ts.io + S3C2410_ADCTSC);
	308
	309	input_dev = input_allocate_device();
	310	if (!input_dev) {
	311	dev_err(dev, "Unable to allocate the input device !!\n");
	312	ret = -ENOMEM;
	313	goto err_iomap;
	314	}
	315
	316	ts.input = input_dev;
	317	ts.input->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
	318	ts.input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
	319	input_set_abs_params(ts.input, ABS_X, 0, 0x3FF, 0, 0);
	320	input_set_abs_params(ts.input, ABS_Y, 0, 0x3FF, 0, 0);
	321
	322	ts.input->name = "S3C24XX TouchScreen";
	323	ts.input->id.bustype = BUS_HOST;
	324	ts.input->id.vendor = 0xDEAD;
	325	ts.input->id.product = 0xBEEF;
	326	ts.input->id.version = 0x0102;
	327
	328	ts.shift = info->oversampling_shift;
91df77d7	329	ts.features = platform_get_device_id(pdev)->driver_data;
f5f96b93 AP	330
	331	ret = request_irq(ts.irq_tc, stylus_irq, IRQF_DISABLED,
	332	"s3c2410_ts_pen", ts.input);
	333	if (ret) {
	334	dev_err(dev, "cannot get TC interrupt\n");
	335	goto err_inputdev;
	336	}
	337
	338	dev_info(dev, "driver attached, registering input device\n");
	339
	340	/* All went ok, so register to the input system */
	341	ret = input_register_device(ts.input);
	342	if (ret < 0) {
	343	dev_err(dev, "failed to register input device\n");
	344	ret = -EIO;
	345	goto err_tcirq;
	346	}
	347
	348	return 0;
	349
	350	err_tcirq:
	351	free_irq(ts.irq_tc, ts.input);
	352	err_inputdev:
	353	input_unregister_device(ts.input);
	354	err_iomap:
	355	iounmap(ts.io);
	356	err_clk:
	357	del_timer_sync(&touch_timer);
	358	clk_put(ts.clock);
	359	return ret;
	360	}
	361
	362	/**
	363	* s3c2410ts_remove - device core removal entry point
	364	* @pdev: The device we are being removed from.
	365	*
	366	* Free up our state ready to be removed.
	367	*/
	368	static int __devexit s3c2410ts_remove(struct platform_device *pdev)
	369	{
	370	free_irq(ts.irq_tc, ts.input);
	371	del_timer_sync(&touch_timer);
	372
	373	clk_disable(ts.clock);
	374	clk_put(ts.clock);
	375
	376	input_unregister_device(ts.input);
	377	iounmap(ts.io);
	378
	379	return 0;
	380	}
	381
	382	#ifdef CONFIG_PM
	383	static int s3c2410ts_suspend(struct device *dev)
	384	{
	385	writel(TSC_SLEEP, ts.io + S3C2410_ADCTSC);
	386	disable_irq(ts.irq_tc);
	387	clk_disable(ts.clock);
	388
	389	return 0;
	390	}
	391
	392	static int s3c2410ts_resume(struct device *dev)
	393	{
394	struct platform_device *pdev = to_platform_device(dev);
395	struct s3c2410_ts_mach_info *info = pdev->dev.platform_data;
396
397	clk_enable(ts.clock);
2f095865	398	enable_irq(ts.irq_tc);
f5f96b93 AP	399
	400	/* Initialise registers */
	401	if ((info->delay & 0xffff) > 0)
	402	writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY);
	403
	404	writel(WAIT4INT \| INT_DOWN, ts.io + S3C2410_ADCTSC);
	405
	406	return 0;
	407	}
	408
	409	static struct dev_pm_ops s3c_ts_pmops = {
	410	.suspend = s3c2410ts_suspend,
	411	.resume = s3c2410ts_resume,
	412	};
	413	#endif
	414
	415	static struct platform_device_id s3cts_driver_ids[] = {
91df77d7	416	{ "s3c64xx-ts", FEAT_PEN_IRQ },
f5f96b93 AP	417	{ }
	418	};
	419	MODULE_DEVICE_TABLE(platform, s3cts_driver_ids);
	420
	421	static struct platform_driver s3c_ts_driver = {
	422	.driver = {
91df77d7	423	.name = "samsung-ts",
f5f96b93 AP	424	.owner = THIS_MODULE,
	425	#ifdef CONFIG_PM
	426	.pm = &s3c_ts_pmops,
	427	#endif
	428	},
	429	.id_table = s3cts_driver_ids,
	430	.probe = s3c2410ts_probe,
	431	.remove = __devexit_p(s3c2410ts_remove),
	432	};
	433
	434	static int __init s3c2410ts_init(void)
	435	{
	436	return platform_driver_register(&s3c_ts_driver);
	437	}
	438
	439	static void __exit s3c2410ts_exit(void)
	440	{
	441	platform_driver_unregister(&s3c_ts_driver);
	442	}
	443
	444	module_init(s3c2410ts_init);
	445	module_exit(s3c2410ts_exit);
	446
	447	MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, "
	448	"Ben Dooks <ben@simtec.co.uk>, "
	449	"Simtec Electronics <linux@simtec.co.uk>");
	450	MODULE_DESCRIPTION("S3C24XX Touchscreen driver");
	451	MODULE_LICENSE("GPL v2");