Message-ID: <20100414125234.23507.42816.stgit@localhost.localdomain>
Date:	Wed, 14 Apr 2010 13:54:02 +0100
From:	Alan Cox <alan@...ux.intel.com>
To:	linux-i2c@...r.kernel.org, khali@...ux-fr.org,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org

Subject: [FOR COMMENT] cy8ctmg110 for review

From: Samuli Konttila <samuli.konttila@...amobile.com>

Add support for the cy8ctmg110 capacitive touchscreen used on some embedded
devices.

(Some clean up by Alan Cox)

(No signed off, not yet ready to go in)
---

 drivers/input/touchscreen/Kconfig         |   12 +
 drivers/input/touchscreen/Makefile        |    3 
 drivers/input/touchscreen/cy8ctmg110_ts.c |  521 +++++++++++++++++++++++++++++
 3 files changed, 535 insertions(+), 1 deletions(-)
 create mode 100644 drivers/input/touchscreen/cy8ctmg110_ts.c


diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index b3ba374..89a3eb1 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -591,4 +591,16 @@ config TOUCHSCREEN_TPS6507X
 	  To compile this driver as a module, choose M here: the
 	  module will be called tps6507x_ts.
 
+config TOUCHSCREEN_CY8CTMG110
+	tristate "cy8ctmg110 touchscreen"
+	depends on I2C
+	help
+	  Say Y here if you have a cy8ctmg110 touchscreen capacitive
+	  touchscreen
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called cy8ctmg110_ts.
+
 endif
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index dfb7239..c7acb65 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -1,5 +1,5 @@
 #
-# Makefile for the touchscreen drivers.
+# Makefile for the touchscreen drivers.mororor
 #
 
 # Each configuration option enables a list of files.
@@ -12,6 +12,7 @@ obj-$(CONFIG_TOUCHSCREEN_AD7879)	+= ad7879.o
 obj-$(CONFIG_TOUCHSCREEN_ADS7846)	+= ads7846.o
 obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC)	+= atmel_tsadcc.o
 obj-$(CONFIG_TOUCHSCREEN_BITSY)		+= h3600_ts_input.o
+obj-$(CONFIG_TOUCHSCREEN_CY8CTMG110)    += cy8ctmg110_ts.o
 obj-$(CONFIG_TOUCHSCREEN_DYNAPRO)	+= dynapro.o
 obj-$(CONFIG_TOUCHSCREEN_GUNZE)		+= gunze.o
 obj-$(CONFIG_TOUCHSCREEN_EETI)		+= eeti_ts.o
diff --git a/drivers/input/touchscreen/cy8ctmg110_ts.c b/drivers/input/touchscreen/cy8ctmg110_ts.c
new file mode 100644
index 0000000..4adbe87
--- /dev/null
+++ b/drivers/input/touchscreen/cy8ctmg110_ts.c
@@ -0,0 +1,521 @@
+/*
+ * cy8ctmg110_ts.c Driver for cypress touch screen controller
+ * Copyright (c) 2009 Aava Mobile
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <asm/io.h>
+#include <linux/i2c.h>
+#include <linux/timer.h>
+#include <linux/gpio.h>
+#include <linux/hrtimer.h>
+
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <asm/ioctl.h>
+#include <asm/uaccess.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <asm/ioctl.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+
+
+#define CY8CTMG110_DRIVER_NAME      "cy8ctmg110"
+
+
+/*HW definations*/
+#define CY8CTMG110_RESET_PIN_GPIO   43
+#define CY8CTMG110_IRQ_PIN_GPIO     59
+#define CY8CTMG110_I2C_ADDR         0x38
+#define CY8CTMG110_I2C_ADDR_EXT     0x39
+#define CY8CTMG110_I2C_ADDR_        0x2	/*i2c address first sample */
+#define CY8CTMG110_I2C_ADDR__       53	/*i2c address to FW where irq support missing */
+#define CY8CTMG110_TOUCH_IRQ        21
+#define CY8CTMG110_TOUCH_LENGHT     9787
+#define CY8CTMG110_SCREEN_LENGHT    8424
+
+
+/*Touch coordinates*/
+#define CY8CTMG110_X_MIN        0
+#define CY8CTMG110_Y_MIN        0
+#define CY8CTMG110_X_MAX        864
+#define CY8CTMG110_Y_MAX        480
+
+
+/*cy8ctmg110 registers defination*/
+#define CY8CTMG110_TOUCH_WAKEUP_TIME   0
+#define CY8CTMG110_TOUCH_SLEEP_TIME    2
+#define CY8CTMG110_TOUCH_X1            3
+#define CY8CTMG110_TOUCH_Y1            5
+#define CY8CTMG110_TOUCH_X2            7
+#define CY8CTMG110_TOUCH_Y2            9
+#define CY8CTMG110_FINGERS             11
+#define CY8CTMG110_GESTURE             12
+#define CY8CTMG110_REG_MAX             13
+
+#define CY8CTMG110_POLL_TIMER_DELAY  1000*1000*100
+#define TOUCH_MAX_I2C_FAILS          50
+
+/* Scale factors for coordinates */
+#define X_SCALE_FACTOR 9387/8424
+#define Y_SCALE_FACTOR 97/100
+
+/* For tracing */
+static int g_y_trace_coord = 0;
+module_param(g_y_trace_coord, int, 0600);
+
+/* Polling mode */
+static int polling = 0;
+module_param(polling, int, 0);
+MODULE_PARM_DESC(polling, "Set to enabling polling of the touchscreen");
+
+
+/*
+ * The touch position structure.
+ */
+struct ts_event {
+	int x1;
+	int y1;
+	int x2;
+	int y2;
+	bool event_sended;
+};
+
+/*
+ * The touch driver structure.
+ */
+struct cy8ctmg110 {
+	struct input_dev *input;
+	char phys[32];
+	struct ts_event tc;
+	struct i2c_client *client;
+	bool pending;
+	spinlock_t lock;
+	bool initController;
+	bool sleepmode;
+	int i2c_fail_count;
+	struct hrtimer timer;
+};
+
+/*
+ * cy8ctmg110_poweroff is the routine that is called when touch hardware 
+ * will powered off
+ */
+static void cy8ctmg110_power(bool poweron)
+{
+	if (poweron)
+		gpio_direction_output(CY8CTMG110_RESET_PIN_GPIO, 0);
+	else
+		gpio_direction_output(CY8CTMG110_RESET_PIN_GPIO, 1);
+}
+
+/*
+ * cy8ctmg110_write_req write regs to the i2c devices
+ * 
+ */
+static int cy8ctmg110_write_req(struct cy8ctmg110 *tsc, unsigned char reg,
+		unsigned char len, unsigned char *value)
+{
+	struct i2c_client *client = tsc->client;
+	unsigned int ret;
+	unsigned char i2c_data[] = { 0, 0, 0, 0, 0, 0 };
+	struct i2c_msg msg[] = {
+			{client->addr, 0, len + 1, i2c_data},
+			};
+
+	i2c_data[0] = reg;
+	memcpy(i2c_data + 1, value, len);
+
+	ret = i2c_transfer(client->adapter, msg, 1);
+	if (ret != 1) {
+		printk("cy8ctmg110 touch : i2c write data cmd failed \n");
+		return ret;
+	}
+	return 0;
+}
+
+/*
+ * cy8ctmg110_read_req read regs from i2c devise
+ * 
+ */
+
+static int cy8ctmg110_read_req(struct cy8ctmg110 *tsc,
+		unsigned char *i2c_data, unsigned char len, unsigned char cmd)
+{
+	struct i2c_client *client = tsc->client;
+	unsigned int ret;
+	unsigned char regs_cmd[2] = { 0, 0 };
+	struct i2c_msg msg1[] = {
+		{client->addr, 0, 1, regs_cmd},
+	};
+	struct i2c_msg msg2[] = {
+		{client->addr, I2C_M_RD, len, i2c_data},
+	};
+
+	regs_cmd[0] = cmd;
+
+	/* first write slave position to i2c devices */
+	ret = i2c_transfer(client->adapter, msg1, 1);
+	if (ret != 1) {
+		tsc->i2c_fail_count++;
+		return ret;
+	}
+
+	/* Second read data from position */
+	ret = i2c_transfer(client->adapter, msg2, 1);
+	if (ret != 1) {
+		tsc->i2c_fail_count++;
+		return ret;
+	}
+	return 0;
+}
+
+/*
+ * cy8ctmg110_send_event delevery touch event to the userpace
+ * function use normal input interface
+ */
+static void cy8ctmg110_send_event(void *tsc)
+{
+	struct cy8ctmg110 *ts = tsc;
+	struct input_dev *input = ts->input;
+	u16 x, y;
+	u16 x2, y2;
+
+	x = ts->tc.x1;
+	y = ts->tc.y1;
+
+	if (ts->tc.event_sended == false) {
+		input_report_key(input, BTN_TOUCH, 1);
+		ts->pending = true;
+		x2 = (u16) (y * X_SCALE_FACTOR);
+		y2 = (u16) (x * Y_SCALE_FACTOR);
+		input_report_abs(input, ABS_X, x2);
+		input_report_abs(input, ABS_Y, y2);
+		input_sync(input);
+		if (g_y_trace_coord)
+			printk("cy8ctmg110 touch position X:%d (was = %d) Y:%d (was = %d)\n", x2, y, y2, x);
+	}
+
+}
+
+/*
+ * cy8ctmg110_touch_pos check touch position from i2c devices
+ * 
+ */
+static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
+{
+	unsigned char reg_p[CY8CTMG110_REG_MAX];
+	int x, y;
+
+	memset(reg_p, 0, CY8CTMG110_REG_MAX);
+
+	/*Reading coordinates */
+	if (cy8ctmg110_read_req(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
+		return -EIO;
+		
+	y = reg_p[2] << 8 | reg_p[3];
+	x = reg_p[0] << 8 | reg_p[1];
+		/*number of touch */
+	if (reg_p[8] == 0) {
+		if (tsc->pending == true) {
+			struct input_dev *input = tsc->input;
+
+			input_report_key(input, BTN_TOUCH, 0);
+			tsc->tc.event_sended = true;
+			tsc->pending = false;
+		}
+	} else if (tsc->tc.x1 != x || tsc->tc.y1 != y) {
+		tsc->tc.y1 = y;
+		tsc->tc.x1 = x;
+		tsc->tc.event_sended = false;
+		cy8ctmg110_send_event(tsc);
+	}
+	return 0;
+}
+
+/*
+ * if interrupt isn't in use the touch positions can reads by polling
+ * 
+ */
+static enum hrtimer_restart cy8ctmg110_timer(struct hrtimer *handle)
+{
+	struct cy8ctmg110 *ts = container_of(handle, struct cy8ctmg110, timer);
+	unsigned long flags;
+
+	spin_lock_irqsave(&ts->lock, flags);
+
+	cy8ctmg110_touch_pos(ts);
+	if (ts->i2c_fail_count < TOUCH_MAX_I2C_FAILS)
+		hrtimer_start(&ts->timer, ktime_set(0, CY8CTMG110_POLL_TIMER_DELAY), HRTIMER_MODE_REL);
+
+	spin_unlock_irqrestore(&ts->lock, flags);
+	return HRTIMER_NORESTART;
+}
+
+/*
+ * cy8ctmg110_init_controller set init value to touchcontroller
+ * 
+ */
+static bool cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts)
+{
+	unsigned char reg_p[3];
+
+	if (ts->sleepmode == true) {
+		reg_p[0] = 0x00;
+		reg_p[1] = 0xff;
+		reg_p[2] = 5;
+	} else {
+		reg_p[0] = 0x10;
+		reg_p[1] = 0xff;
+		reg_p[2] = 0;
+	}
+
+	if (cy8ctmg110_write_req(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p))
+		return false;
+
+	ts->initController = true;
+	return true;
+}
+
+/*
+ * cy8ctmg110_irq_handler irq handling function
+ * 
+ */
+
+static irqreturn_t cy8ctmg110_irq_handler(int irq, void *dev_id)
+{
+	struct cy8ctmg110 *tsc = (struct cy8ctmg110 *) dev_id;
+
+	if (tsc->initController == false) {
+		if (cy8ctmg110_set_sleepmode(tsc) == true)
+			tsc->initController = true;
+	} else
+		cy8ctmg110_touch_pos(tsc);
+
+	/* if interrupt supported in the touch controller
+	   timer polling need to stop */
+	tsc->i2c_fail_count = TOUCH_MAX_I2C_FAILS;
+	return IRQ_HANDLED;
+}
+
+
+static int cy8ctmg110_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+	struct cy8ctmg110 *ts;
+	struct input_dev *input_dev;
+	int err;
+	client->irq = CY8CTMG110_TOUCH_IRQ;
+
+	if (!i2c_check_functionality(client->adapter,
+					I2C_FUNC_SMBUS_READ_WORD_DATA))
+		return -EIO;
+
+	ts = kzalloc(sizeof(struct cy8ctmg110), GFP_KERNEL);
+	input_dev = input_allocate_device();
+
+	if (!ts || !input_dev) {
+		err = -ENOMEM;
+		goto err_free_mem;
+	}
+
+	ts->client = client;
+	i2c_set_clientdata(client, ts);
+
+	ts->input = input_dev;
+	ts->pending = false;
+	ts->sleepmode = false;
+
+	snprintf(ts->phys, sizeof(ts->phys), "%s/input0",
+						dev_name(&client->dev));
+
+	input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
+	input_dev->phys = ts->phys;
+	input_dev->id.bustype = BUS_I2C;
+
+	spin_lock_init(&ts->lock);
+
+	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) |
+					BIT_MASK(EV_REL) | BIT_MASK(EV_ABS);
+	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+
+	input_set_capability(input_dev, EV_KEY, KEY_F);
+
+	input_set_abs_params(input_dev, ABS_X, CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 0, 0);
+	input_set_abs_params(input_dev, ABS_Y, CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 0, 0);
+
+	err = gpio_request(CY8CTMG110_RESET_PIN_GPIO, NULL);
+
+	if (err) {
+		dev_err(&client->dev, "cy8ctmg110_ts: Unable to request GPIO pin %d.\n",
+						CY8CTMG110_RESET_PIN_GPIO);
+		goto err_free_irq;
+	}
+	cy8ctmg110_power(true);
+
+	ts->initController = false;
+	ts->i2c_fail_count = 0;
+
+	hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+	ts->timer.function = cy8ctmg110_timer;
+
+	if (polling)
+		hrtimer_start(&ts->timer, ktime_set(10, 0), HRTIMER_MODE_REL);
+
+	/* Can we fall back to polling if these bits fail - something to look
+	   at for robustness */
+
+	err = gpio_request(CY8CTMG110_IRQ_PIN_GPIO, "touch_irq_key");
+	if (err < 0) {
+		dev_err(&client->dev,
+			"cy8ctmg110_ts: failed to request GPIO %d, error %d\n",
+						CY8CTMG110_IRQ_PIN_GPIO, err);
+		goto err_free_timer;
+	}
+
+	err = gpio_direction_input(CY8CTMG110_IRQ_PIN_GPIO);
+
+	if (err < 0) {
+		dev_err(&client->dev,
+			"cy8ctmg110_ts: failed to configure input direction for GPIO %d, error %d\n",
+						CY8CTMG110_IRQ_PIN_GPIO, err);
+		goto err_free_gpio;
+	}
+	client->irq = gpio_to_irq(CY8CTMG110_IRQ_PIN_GPIO);
+
+	if (client->irq < 0) {
+		err = client->irq;
+		dev_err(&client->dev,
+	"cy8ctmg110_ts: Unable to get irq number" " for GPIO %d, error %d\n",
+						CY8CTMG110_IRQ_PIN_GPIO, err);
+		goto err_free_gpio;
+	}
+	err = request_irq(client->irq, cy8ctmg110_irq_handler, IRQF_TRIGGER_RISING | IRQF_SHARED, "touch_reset_key", ts);
+	if (err < 0) {
+		dev_err(&client->dev,
+			"cy8ctmg110 irq %d busy? error %d\n",
+				client->irq, err);
+		goto err_free_gpio;
+	}
+
+	err = input_register_device(input_dev);
+	if (!err)
+		return 0;
+err_free_gpio:
+	gpio_free(CY8CTMG110_IRQ_PIN_GPIO);
+err_free_timer:
+	if (polling)
+		hrtimer_cancel(&ts->timer);
+err_free_irq:
+	free_irq(client->irq, ts);
+err_free_mem:
+	input_free_device(input_dev);
+	kfree(ts);
+	return err;
+}
+
+/*
+ * cy8ctmg110_suspend
+ * 
+ */
+
+static int cy8ctmg110_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+	if (device_may_wakeup(&client->dev))
+		enable_irq_wake(client->irq);
+
+	return 0;
+}
+
+/*
+ * cy8ctmg110_resume 
+ * 
+ */
+
+static int cy8ctmg110_resume(struct i2c_client *client)
+{
+	if (device_may_wakeup(&client->dev))
+		disable_irq_wake(client->irq);
+
+	return 0;
+}
+
+/*
+ * cy8ctmg110_remove
+ * 
+ */
+
+static int cy8ctmg110_remove(struct i2c_client *client)
+{
+	struct cy8ctmg110 *ts = i2c_get_clientdata(client);
+
+	cy8ctmg110_power(false);
+
+	if (polling)
+		hrtimer_cancel(&ts->timer);
+	free_irq(client->irq, ts);
+	input_unregister_device(ts->input);
+	/* FIXME: Do we need to free the GPIO ? */
+	kfree(ts);
+	return 0;
+}
+
+static struct i2c_device_id cy8ctmg110_idtable[] = {
+	{CY8CTMG110_DRIVER_NAME, 1},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);
+
+static struct i2c_driver cy8ctmg110_driver = {
+	.driver = {
+		   .owner = THIS_MODULE,
+		   .name = CY8CTMG110_DRIVER_NAME,
+		   .bus = &i2c_bus_type,
+		   },
+	.id_table = cy8ctmg110_idtable,
+	.probe = cy8ctmg110_probe,
+	.remove = cy8ctmg110_remove,
+	.suspend = cy8ctmg110_suspend,
+	.resume = cy8ctmg110_resume,
+};
+
+static int __init cy8ctmg110_init(void)
+{
+	return i2c_add_driver(&cy8ctmg110_driver);
+}
+
+static void __exit cy8ctmg110_exit(void)
+{
+	i2c_del_driver(&cy8ctmg110_driver);
+}
+
+module_init(cy8ctmg110_init);
+module_exit(cy8ctmg110_exit);
+
+MODULE_AUTHOR("Samuli Konttila <samuli.konttila@...amobile.com>");
+MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
+MODULE_LICENSE("GPL v2");

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