Add s3c2410ts

Add the ts and the relevant files.

Signed-off-by: Nelson Castillo <arhuaco@freaks-unidos.net>

3 files changed, 571 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index faf929e5454..835bb5172be 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -55,6 +55,24 @@ config TOUCHSCREEN_FILTER_LINEAR
 	  Say Y here if you want to use the Linear touchscreen filter, it
 	  enables the use of calibration data for the touchscreen.
 
+config TOUCHSCREEN_S3C2410
+	tristate "Samsung S3C2410 touchscreen input driver"
+	depends on ARCH_S3C2410 && INPUT && INPUT_TOUCHSCREEN
+	select SERIO
+	help
+	  Say Y here if you have the s3c2410 touchscreen.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called s3c2410_ts.
+
+config TOUCHSCREEN_S3C2410_DEBUG
+	boolean "Samsung S3C2410 touchscreen debug messages"
+	depends on TOUCHSCREEN_S3C2410
+	help
+	  Select this if you want debug messages
+
 config TOUCHSCREEN_ADS7846
 	tristate "ADS7846/TSC2046 and ADS7843 based touchscreens"
 	depends on SPI_MASTER
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 322df12bb30..453477fe012 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -47,3 +47,4 @@ obj-$(CONFIG_TOUCHSCREEN_FILTER_GROUP)	+= ts_filter_group.o
 obj-$(CONFIG_TOUCHSCREEN_FILTER_LINEAR)	+= ts_filter_linear.o
 obj-$(CONFIG_TOUCHSCREEN_FILTER_MEDIAN)	+= ts_filter_median.o
 obj-$(CONFIG_TOUCHSCREEN_FILTER_MEAN)	+= ts_filter_mean.o
+obj-$(CONFIG_TOUCHSCREEN_S3C2410)	+= s3c2410_ts.o
diff --git a/drivers/input/touchscreen/s3c2410_ts.c b/drivers/input/touchscreen/s3c2410_ts.c
new file mode 100644
index 00000000000..caccc83cd12
--- /dev/null
+++ b/drivers/input/touchscreen/s3c2410_ts.c
@@ -0,0 +1,552 @@
+/*
+ * 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.
+ *
+ * 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 (c) 2004 Arnaud Patard <arnaud.patard@rtp-net.org>
+ * iPAQ H1940 touchscreen support
+ *
+ * ChangeLog
+ *
+ * 2004-09-05: Herbert Pötzl <herbert@13thfloor.at>
+ *      - Added clock (de-)allocation code
+ *
+ * 2005-03-06: Arnaud Patard <arnaud.patard@rtp-net.org>
+ *      - h1940_ -> s3c2410 (this driver is now also used on the n30
+ *        machines :P)
+ *      - Debug messages are now enabled with the config option
+ *        TOUCHSCREEN_S3C2410_DEBUG
+ *      - Changed the way the value are read
+ *      - Input subsystem should now work
+ *      - Use ioremap and readl/writel
+ *
+ * 2005-03-23: Arnaud Patard <arnaud.patard@rtp-net.org>
+ *      - Make use of some undocumented features of the touchscreen
+ *        controller
+ *
+ * 2007-05-23: Harald Welte <laforge@openmoko.org>
+ *      - Add proper support for S32440
+ *
+ * 2008-06-23: Andy Green <andy@warmcat.com>
+ *      - Removed averaging system
+ *      - Added generic Touchscreen filter stuff
+ *
+ * 2008-11-27: Nelson Castillo <arhuaco@freaks-unidos.net>
+ *      - Improve interrupt handling
+ *
+ * 2009-04-09: Nelson Castillo <arhuaco@freaks-unidos.net>
+ *      - Use s3c-adc API (Vasily Khoruzhick <anarsoul@gmail.com> provided
+ *        a working example for a simpler version of this driver).
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/init.h>
+#include <linux/serio.h>
+#include <linux/timer.h>
+#include <linux/kfifo.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <asm/irq.h>
+
+#include <mach/regs-gpio.h>
+#include <mach/gpio-nrs.h>
+#include <mach/gpio-fns.h>
+#include <mach/ts.h>
+#include <mach/hardware.h>
+#include <plat/regs-adc.h>
+#include <plat/adc.h>
+
+#include "ts_filter_chain.h"
+
+/* For ts.dev.id.version */
+#define S3C2410TSVERSION	0x0101
+
+#define WAIT4INT(x)		(((x)<<8) | \
+				S3C2410_ADCTSC_YM_SEN | \
+				S3C2410_ADCTSC_YP_SEN | \
+				S3C2410_ADCTSC_XP_SEN | \
+				S3C2410_ADCTSC_XY_PST(3))
+
+#define TSPRINTK(fmt, args...) \
+	printk(KERN_DEBUG "%s: " fmt, __func__ , ## args)
+#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
+#	define DPRINTK TSPRINTK
+#else
+#	define DPRINTK(fmt, args...)
+#endif
+
+
+MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
+MODULE_DESCRIPTION("s3c2410 touchscreen driver");
+MODULE_LICENSE("GPL");
+
+/*
+ * Definitions & global arrays.
+ */
+
+static char *s3c2410ts_name = "s3c2410 TouchScreen";
+
+#define TS_RELEASE_TIMEOUT (HZ >> 7 ? HZ >> 7 : 1) /* 8ms (5ms if HZ is 200) */
+#define TS_EVENT_FIFO_SIZE (2 << 6) /* Must be a power of 2. */
+
+/*
+ * Per-touchscreen data.
+ */
+
+enum	ts_state {TS_STATE_STANDBY, TS_STATE_PRESSED, TS_STATE_RELEASE_PENDING,
+		  TS_STATE_RELEASE};
+
+struct s3c2410ts {
+	struct input_dev *dev;
+	struct ts_filter_chain *chain;
+	enum ts_state state;
+	int is_down;
+	struct kfifo *event_fifo;
+	struct s3c_adc_client *adc_client;
+	unsigned adc_selected;
+};
+
+static struct s3c2410ts ts;
+
+static void __iomem *base_addr;
+
+/*
+ * A few low level functions.
+ */
+
+static inline void s3c2410_ts_connect(void)
+{
+	s3c2410_gpio_cfgpin(S3C2410_GPG(12), S3C2410_GPG12_XMON);
+	s3c2410_gpio_cfgpin(S3C2410_GPG(13), S3C2410_GPG13_nXPON);
+	s3c2410_gpio_cfgpin(S3C2410_GPG(14), S3C2410_GPG14_YMON);
+	s3c2410_gpio_cfgpin(S3C2410_GPG(15), S3C2410_GPG15_nYPON);
+}
+
+/*
+ * Code that starts ADC conversions.
+ */
+
+static void ts_adc_timer_f(unsigned long data);
+static struct timer_list ts_adc_timer = TIMER_INITIALIZER(ts_adc_timer_f, 0, 0);
+
+static void ts_adc_timer_f(unsigned long data)
+{
+	if (s3c_adc_start(ts.adc_client, 0, 1))
+		mod_timer(&ts_adc_timer, jiffies + 1);
+}
+
+static void s3c2410_ts_start_adc_conversion(void)
+{
+	if (ts.adc_selected)
+		mod_timer(&ts_adc_timer, jiffies + 1);
+	else
+		ts_adc_timer_f(0);
+}
+
+/* Callback for the s3c-adc API. */
+void adc_selected_f(unsigned selected)
+{
+	ts.adc_selected = selected;
+}
+
+/*
+ * Just send the input events.
+ */
+
+enum ts_input_event {IE_DOWN = 0, IE_UP};
+
+static void ts_input_report(int event, int coords[])
+{
+#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
+	static char *s[] = {"down", "up"};
+	struct timeval tv;
+
+	do_gettimeofday(&tv);
+#endif
+
+	if (event == IE_DOWN) {
+		input_report_abs(ts.dev, ABS_X, coords[0]);
+		input_report_abs(ts.dev, ABS_Y, coords[1]);
+		input_report_key(ts.dev, BTN_TOUCH, 1);
+		input_report_abs(ts.dev, ABS_PRESSURE, 1);
+
+		DPRINTK("T:%06d %6s (X:%03d, Y:%03d)\n",
+			(int)tv.tv_usec, s[event], coords[0], coords[1]);
+	} else {
+		input_report_key(ts.dev, BTN_TOUCH, 0);
+		input_report_abs(ts.dev, ABS_PRESSURE, 0);
+
+		DPRINTK("T:%06d %6s\n",
+			(int)tv.tv_usec, s[event]);
+	}
+
+	input_sync(ts.dev);
+}
+
+/*
+ * Manage the state of the touchscreen.
+ */
+
+static void event_send_timer_f(unsigned long data);
+
+static struct timer_list event_send_timer =
+		TIMER_INITIALIZER(event_send_timer_f, 0, 0);
+
+static void event_send_timer_f(unsigned long data)
+{
+	static int noop_counter;
+	int event_type;
+
+	while (__kfifo_get(ts.event_fifo, (unsigned char *)&event_type,
+			   sizeof(int))) {
+		int buf[2];
+
+		switch (event_type) {
+		case 'D':
+			if (ts.state == TS_STATE_RELEASE_PENDING)
+				/* Ignore short UP event. */
+				ts.state = TS_STATE_PRESSED;
+			break;
+
+		case 'U':
+			ts.state = TS_STATE_RELEASE_PENDING;
+			break;
+
+		case 'P':
+			if (ts.is_down) /* Stylus_action needs a conversion. */
+				s3c2410_ts_start_adc_conversion();
+
+			if (unlikely(__kfifo_get(ts.event_fifo,
+						 (unsigned char *)buf,
+						 sizeof(int) * 2)
+				     != sizeof(int) * 2)) {
+				/* This will only happen if we have a bug. */
+				TSPRINTK("Invalid packet\n");
+				return;
+			}
+
+			ts_input_report(IE_DOWN, buf);
+			ts.state = TS_STATE_PRESSED;
+			break;
+		}
+
+		noop_counter = 0;
+	}
+
+	if (noop_counter++ >= 1) {
+		noop_counter = 0;
+		if (ts.state == TS_STATE_RELEASE_PENDING) {
+			/*
+			 * We delay the UP event for a while to avoid jitter.
+			 * If we get a DOWN event we do not send it.
+			 */
+			ts_input_report(IE_UP, NULL);
+			ts.state = TS_STATE_STANDBY;
+
+			ts_filter_chain_clear(ts.chain);
+		}
+	} else {
+		mod_timer(&event_send_timer, jiffies + TS_RELEASE_TIMEOUT);
+	}
+}
+
+/*
+ * Manage interrupts.
+ */
+
+static irqreturn_t stylus_updown(int irq, void *dev_id)
+{
+	unsigned long data0;
+	unsigned long data1;
+	int event_type;
+
+	data0 = readl(base_addr + S3C2410_ADCDAT0);
+	data1 = readl(base_addr + S3C2410_ADCDAT1);
+
+	ts.is_down = !(data0 & S3C2410_ADCDAT0_UPDOWN) &&
+		     !(data1 & S3C2410_ADCDAT0_UPDOWN);
+
+	event_type = ts.is_down ? 'D' : 'U';
+
+	if (unlikely(__kfifo_put(ts.event_fifo, (unsigned char *)&event_type,
+		     sizeof(int)) != sizeof(int)))
+		/* Only happens if we have a bug. */
+		TSPRINTK("FIFO full\n");
+
+	if (ts.is_down)
+		s3c2410_ts_start_adc_conversion();
+	else
+		writel(WAIT4INT(0), base_addr + S3C2410_ADCTSC);
+
+	mod_timer(&event_send_timer, jiffies + 1);
+
+	return IRQ_HANDLED;
+}
+
+static void stylus_adc_action(unsigned p0, unsigned p1, unsigned *conv_left)
+{
+	int buf[3];
+
+	/* TODO: Do we really need this? */
+	if (p0 & S3C2410_ADCDAT0_AUTO_PST ||
+	    p1 & S3C2410_ADCDAT1_AUTO_PST) {
+		*conv_left = 1;
+		return;
+	}
+
+	buf[1] = p0;
+	buf[2] = p1;
+
+	switch (ts_filter_chain_feed(ts.chain, &buf[1])) {
+	case 0:
+		/* The filter wants more points. */
+		*conv_left = 1;
+		return;
+	case 1:
+		/* We have a point from the filters or no filtering enabled. */
+		buf[0] = 'P';
+		break;
+	default:
+		TSPRINTK("invalid return value\n");
+	case -1:
+		/* Too much noise. Ignore the event. */
+		ts_filter_chain_clear(ts.chain);
+		writel(WAIT4INT(1), base_addr + S3C2410_ADCTSC);
+		return;
+	};
+
+	if (unlikely(__kfifo_put(ts.event_fifo, (unsigned char *)buf,
+		     sizeof(int) * 3) != sizeof(int) * 3))
+		/* This will only happen if we have a bug. */
+		TSPRINTK("FIFO full\n");
+
+	writel(WAIT4INT(1), base_addr + S3C2410_ADCTSC);
+	mod_timer(&event_send_timer, jiffies + 1);
+
+	return;
+}
+
+/*
+ * The functions for inserting/removing us as a module.
+ */
+
+static int __init s3c2410ts_probe(struct platform_device *pdev)
+{
+	int rc;
+	struct s3c2410_ts_mach_info *info;
+	struct input_dev *input_dev;
+	int ret = 0;
+
+	dev_info(&pdev->dev, "Starting\n");
+
+	info = (struct s3c2410_ts_mach_info *)pdev->dev.platform_data;
+
+	if (!info) {
+		dev_err(&pdev->dev, "No platform data\n");
+		return -EINVAL;
+	}
+
+	base_addr = ioremap(S3C2410_PA_ADC, 0x20);
+	if (base_addr == NULL) {
+		dev_err(&pdev->dev, "Failed to remap register block\n");
+		ret = -ENOMEM;
+		goto bail0;
+	}
+
+	/* If we acutally are a S3C2410: Configure GPIOs */
+	if (!strcmp(pdev->name, "s3c2410-ts"))
+		s3c2410_ts_connect();
+
+	writel(WAIT4INT(0), base_addr + S3C2410_ADCTSC);
+
+	/* Initialise input stuff */
+	memset(&ts, 0, sizeof(struct s3c2410ts));
+
+	ts.adc_client =
+		s3c_adc_register(pdev, adc_selected_f, stylus_adc_action, 1);
+	if (!ts.adc_client) {
+		dev_err(&pdev->dev,
+			"Unable to register s3c2410_ts as s3_adc client\n");
+		iounmap(base_addr);
+		ret = -EIO;
+		goto bail0;
+	}
+
+	input_dev = input_allocate_device();
+	if (!input_dev) {
+		dev_err(&pdev->dev, "Unable to allocate the input device\n");
+		ret = -ENOMEM;
+		goto bail1;
+	}
+
+	ts.dev = input_dev;
+	ts.dev->evbit[0] = BIT_MASK(EV_SYN) | BIT_MASK(EV_KEY) |
+			   BIT_MASK(EV_ABS);
+	ts.dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+	input_set_abs_params(ts.dev, ABS_X, 0, 0x3FF, 0, 0);
+	input_set_abs_params(ts.dev, ABS_Y, 0, 0x3FF, 0, 0);
+	input_set_abs_params(ts.dev, ABS_PRESSURE, 0, 1, 0, 0);
+
+	ts.dev->name = s3c2410ts_name;
+	ts.dev->id.bustype = BUS_RS232;
+	ts.dev->id.vendor = 0xDEAD;
+	ts.dev->id.product = 0xBEEF;
+	ts.dev->id.version = S3C2410TSVERSION;
+	ts.state = TS_STATE_STANDBY;
+	ts.event_fifo = kfifo_alloc(TS_EVENT_FIFO_SIZE, GFP_KERNEL, NULL);
+	if (IS_ERR(ts.event_fifo)) {
+		ret = -EIO;
+		goto bail2;
+	}
+
+	/* Create the filter chain set up for the 2 coordinates we produce. */
+	ts.chain = ts_filter_chain_create(pdev, info->filter_config, 2);
+
+	if (IS_ERR(ts.chain))
+		goto bail2;
+
+	ts_filter_chain_clear(ts.chain);
+
+	/* Get IRQ. */
+	if (request_irq(IRQ_TC, stylus_updown, 0, "s3c2410_action", ts.dev)) {
+		dev_err(&pdev->dev, "Could not allocate ts IRQ_TC !\n");
+		iounmap(base_addr);
+		ret = -EIO;
+		goto bail3;
+	}
+
+	dev_info(&pdev->dev, "Successfully loaded\n");
+
+	/* All went ok. Register to the input system. */
+	rc = input_register_device(ts.dev);
+	if (rc) {
+		dev_info(&pdev->dev, "Could not register input device\n");
+		ret = -EIO;
+		goto bail4;
+	}
+
+	return 0;
+
+bail4:
+	free_irq(IRQ_TC, ts.dev);
+	iounmap(base_addr);
+	disable_irq(IRQ_TC);
+bail3:
+	ts_filter_chain_destroy(ts.chain);
+	kfifo_free(ts.event_fifo);
+bail2:
+	input_unregister_device(ts.dev);
+bail1:
+	iounmap(base_addr);
+bail0:
+
+	return ret;
+}
+
+static int s3c2410ts_remove(struct platform_device *pdev)
+{
+	disable_irq(IRQ_TC);
+	free_irq(IRQ_TC, ts.dev);
+
+	s3c_adc_release(ts.adc_client);
+	input_unregister_device(ts.dev);
+	iounmap(base_addr);
+
+	ts_filter_chain_destroy(ts.chain);
+
+	kfifo_free(ts.event_fifo);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+#define TSC_SLEEP	(S3C2410_ADCTSC_PULL_UP_DISABLE | \
+			 S3C2410_ADCTSC_XY_PST(0))
+
+static int s3c2410ts_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	writel(TSC_SLEEP, base_addr + S3C2410_ADCTSC);
+	writel(readl(base_addr + S3C2410_ADCCON) | S3C2410_ADCCON_STDBM,
+	       base_addr + S3C2410_ADCCON);
+	disable_irq(IRQ_TC);
+
+	return 0;
+}
+
+static int s3c2410ts_resume(struct platform_device *pdev)
+{
+	ts_filter_chain_clear(ts.chain);
+	enable_irq(IRQ_TC);
+	writel(WAIT4INT(0), base_addr + S3C2410_ADCTSC);
+
+	return 0;
+}
+
+#else
+#define s3c2410ts_suspend NULL
+#define s3c2410ts_resume  NULL
+#endif
+
+static struct platform_driver s3c2410ts_driver = {
+	.driver = {
+		.name	= "s3c2410-ts",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= s3c2410ts_probe,
+	.remove		= s3c2410ts_remove,
+	.suspend	= s3c2410ts_suspend,
+	.resume		= s3c2410ts_resume,
+};
+
+static struct platform_driver s3c2440ts_driver = {
+	.driver = {
+		.name	= "s3c2440-ts",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= s3c2410ts_probe,
+	.remove		= s3c2410ts_remove,
+	.suspend	= s3c2410ts_suspend,
+	.resume		= s3c2410ts_resume,
+};
+
+static int __init s3c2410ts_init(void)
+{
+	int rc;
+
+	rc = platform_driver_register(&s3c2410ts_driver);
+	if (rc < 0)
+		return rc;
+
+	rc = platform_driver_register(&s3c2440ts_driver);
+	if (rc < 0)
+		platform_driver_unregister(&s3c2410ts_driver);
+
+	return rc;
+}
+
+static void __exit s3c2410ts_exit(void)
+{
+	platform_driver_unregister(&s3c2440ts_driver);
+	platform_driver_unregister(&s3c2410ts_driver);
+}
+
+module_init(s3c2410ts_init);
+module_exit(s3c2410ts_exit);
+