ENGR00277223-1 input: port elan touch driver to 3.10 kernel

It's ported from 3.5.7 kernel. To test this driver, the EBook Daughter
Board need to be attached (on imx6dl sabresd or imx6sl evk board).

Signed-off-by: Robby Cai <R63905@freescale.com>

3 files changed, 485 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 4cc002a61f3f..041a3dad16cb 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -244,6 +244,18 @@ config TOUCHSCREEN_EGALAX_SINGLE_TOUCH
 	  on the eGalax I2C controller.
 	  If you say "no", you'll get the normal multi-touch
 
+config TOUCHSCREEN_ELAN
+	tristate "ELAN touchscreen input driver"
+	depends on I2C
+	help
+	  Say Y here if you have an I2C ELAN touchscreen
+	  attached.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called elan-touch.
+
 config TOUCHSCREEN_FUJITSU
 	tristate "Fujitsu serial touchscreen"
 	select SERIO
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 6bfbeab67c9f..a5dde290ada6 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_TOUCHSCREEN_EDT_FT5X06)	+= edt-ft5x06.o
 obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE)	+= hampshire.o
 obj-$(CONFIG_TOUCHSCREEN_GUNZE)		+= gunze.o
 obj-$(CONFIG_TOUCHSCREEN_EETI)		+= eeti_ts.o
+obj-$(CONFIG_TOUCHSCREEN_ELAN)		+= elan_ts.o
 obj-$(CONFIG_TOUCHSCREEN_ELO)		+= elo.o
 obj-$(CONFIG_TOUCHSCREEN_EGALAX)	+= egalax_ts.o
 obj-$(CONFIG_TOUCHSCREEN_FUJITSU)	+= fujitsu_ts.o
diff --git a/drivers/input/touchscreen/elan_ts.c b/drivers/input/touchscreen/elan_ts.c
new file mode 100644
index 000000000000..783a72f15d7e
--- /dev/null
+++ b/drivers/input/touchscreen/elan_ts.c
@@ -0,0 +1,472 @@
+/*
+ * Copyright (C) 2007-2008 HTC Corporation.
+ *
+ * Copyright (C) 2013 Freescale Semiconductor, Inc.
+ *
+ * This driver is adapted from elan8232_i2c.c written by Shan-Fu Chiou
+ * <sfchiou@gmail.com> and Jay Tu <jay_tu@htc.com>.
+ * This driver is also adapted from the ELAN Touch Screen driver
+ * written by Stanley Zeng <stanley.zeng@emc.com.tw>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/input.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/hrtimer.h>
+#include <linux/of_gpio.h>
+#include <linux/regulator/consumer.h>
+#include <linux/gpio.h>
+
+static const char ELAN_TS_NAME[] = "elan-touch";
+
+#define ELAN_TS_X_MAX		1088
+#define ELAN_TS_Y_MAX		768
+#define ELAN_USER_X_MAX		800
+#define ELAN_USER_Y_MAX		600
+#define IDX_PACKET_SIZE		8
+
+enum {
+	hello_packet = 0x55,
+	idx_coordinate_packet = 0x5a,
+};
+
+enum {
+	idx_finger_state = 7,
+};
+
+static struct workqueue_struct *elan_wq;
+
+static struct elan_data {
+	int intr_gpio;
+	int use_irq;
+	struct hrtimer timer;
+	struct work_struct work;
+	struct i2c_client *client;
+	struct input_dev *input;
+	wait_queue_head_t wait;
+} elan_touch_data;
+
+/*--------------------------------------------------------------*/
+static int elan_touch_detect_int_level(void)
+{
+	int v;
+	v = gpio_get_value(elan_touch_data.intr_gpio);
+
+	return v;
+}
+
+static int __elan_touch_poll(struct i2c_client *client)
+{
+	int status = 0, retry = 20;
+
+	do {
+		status = elan_touch_detect_int_level();
+		retry--;
+		mdelay(20);
+	} while (status == 1 && retry > 0);
+
+	return (status == 0 ? 0 : -ETIMEDOUT);
+}
+
+static int elan_touch_poll(struct i2c_client *client)
+{
+	return __elan_touch_poll(client);
+}
+
+static int __hello_packet_handler(struct i2c_client *client)
+{
+	int rc;
+	uint8_t buf_recv[4] = { 0 };
+
+	rc = elan_touch_poll(client);
+
+	if (rc < 0)
+		return -EINVAL;
+
+	rc = i2c_master_recv(client, buf_recv, 4);
+
+	if (rc != 4) {
+		return rc;
+	} else {
+		int i;
+		pr_info("hello packet: [0x%02x 0x%02x 0x%02x 0x%02x]\n",
+		       buf_recv[0], buf_recv[1], buf_recv[2], buf_recv[3]);
+
+		for (i = 0; i < 4; i++)
+			if (buf_recv[i] != hello_packet)
+				return -EINVAL;
+	}
+
+	return 0;
+}
+
+static inline int elan_touch_parse_xy(uint8_t *data, uint16_t *x,
+				      uint16_t *y)
+{
+	*x = (data[0] & 0xf0);
+	*x <<= 4;
+	*x |= data[1];
+	if (*x >= ELAN_TS_X_MAX)
+		*x = ELAN_TS_X_MAX;
+	*x = ((((ELAN_TS_X_MAX -
+		 *x) * 1000) / ELAN_TS_X_MAX) * ELAN_USER_X_MAX) / 1000;
+
+	*y = (data[0] & 0x0f);
+	*y <<= 8;
+	*y |= data[2];
+	if (*y >= ELAN_TS_Y_MAX)
+		*y = ELAN_TS_Y_MAX;
+	*y = ((((ELAN_TS_Y_MAX -
+		 *y) * 1000) / ELAN_TS_Y_MAX) * ELAN_USER_Y_MAX) / 1000;
+
+	return 0;
+}
+
+/*	__elan_touch_init -- hand shaking with touch panel
+ *
+ *	1.recv hello packet
+ */
+static int __elan_touch_init(struct i2c_client *client)
+{
+	int rc;
+	rc = __hello_packet_handler(client);
+	if (rc < 0)
+		goto hand_shake_failed;
+
+hand_shake_failed:
+	return rc;
+}
+
+static int elan_touch_recv_data(struct i2c_client *client, uint8_t * buf)
+{
+	int rc, bytes_to_recv = IDX_PACKET_SIZE;
+
+	if (buf == NULL)
+		return -EINVAL;
+
+	memset(buf, 0, bytes_to_recv);
+	rc = i2c_master_recv(client, buf, bytes_to_recv);
+	if (rc != bytes_to_recv)
+		return -EINVAL;
+
+	return rc;
+}
+
+static void elan_touch_report_data(struct i2c_client *client, uint8_t * buf)
+{
+	switch (buf[0]) {
+	case idx_coordinate_packet:
+	{
+		uint16_t x1, x2, y1, y2;
+		uint8_t finger_stat;
+
+		finger_stat = (buf[idx_finger_state] & 0x06) >> 1;
+
+		if (finger_stat == 0) {
+			input_report_key(elan_touch_data.input, BTN_TOUCH, 0);
+			input_report_key(elan_touch_data.input, BTN_2, 0);
+		} else if (finger_stat == 1) {
+			elan_touch_parse_xy(&buf[1], &x1, &y1);
+			input_report_abs(elan_touch_data.input, ABS_X, x1);
+			input_report_abs(elan_touch_data.input, ABS_Y, y1);
+			input_report_key(elan_touch_data.input, BTN_TOUCH, 1);
+			input_report_key(elan_touch_data.input, BTN_2, 0);
+		} else if (finger_stat == 2) {
+			elan_touch_parse_xy(&buf[1], &x1, &y1);
+			input_report_abs(elan_touch_data.input, ABS_X, x1);
+			input_report_abs(elan_touch_data.input, ABS_Y, y1);
+			input_report_key(elan_touch_data.input, BTN_TOUCH, 1);
+			elan_touch_parse_xy(&buf[4], &x2, &y2);
+			input_report_abs(elan_touch_data.input, ABS_HAT0X, x2);
+			input_report_abs(elan_touch_data.input, ABS_HAT0Y, y2);
+			input_report_key(elan_touch_data.input, BTN_2, 1);
+		}
+		input_sync(elan_touch_data.input);
+		break;
+	}
+
+	default:
+		break;
+	}
+}
+
+static void elan_touch_work_func(struct work_struct *work)
+{
+	int rc;
+	uint8_t buf[IDX_PACKET_SIZE] = { 0 };
+	struct i2c_client *client = elan_touch_data.client;
+
+	if (elan_touch_detect_int_level())
+		return;
+
+	rc = elan_touch_recv_data(client, buf);
+	if (rc < 0)
+		return;
+
+	elan_touch_report_data(client, buf);
+}
+
+static irqreturn_t elan_touch_ts_interrupt(int irq, void *dev_id)
+{
+	queue_work(elan_wq, &elan_touch_data.work);
+
+	return IRQ_HANDLED;
+}
+
+static enum hrtimer_restart elan_touch_timer_func(struct hrtimer *timer)
+{
+	queue_work(elan_wq, &elan_touch_data.work);
+	hrtimer_start(&elan_touch_data.timer, ktime_set(0, 12500000),
+		      HRTIMER_MODE_REL);
+
+	return HRTIMER_NORESTART;
+}
+
+static int elan_touch_register_interrupt(struct i2c_client *client)
+{
+	int err = 0;
+
+	if (client->irq) {
+		elan_touch_data.use_irq = 1;
+		err =
+		    request_irq(client->irq, elan_touch_ts_interrupt,
+				IRQF_TRIGGER_FALLING, ELAN_TS_NAME,
+				&elan_touch_data);
+
+		if (err < 0) {
+			pr_info("%s(%s): Can't allocate irq %d\n", __FILE__,
+			       __func__, client->irq);
+			elan_touch_data.use_irq = 0;
+		}
+	}
+
+	if (!elan_touch_data.use_irq) {
+		hrtimer_init(&elan_touch_data.timer, CLOCK_MONOTONIC,
+			     HRTIMER_MODE_REL);
+		elan_touch_data.timer.function = elan_touch_timer_func;
+		hrtimer_start(&elan_touch_data.timer, ktime_set(1, 0),
+			      HRTIMER_MODE_REL);
+	}
+
+	pr_info("elan ts starts in %s mode.\n",
+	       elan_touch_data.use_irq == 1 ? "interrupt" : "polling");
+
+	return 0;
+}
+
+static int elan_touch_probe(struct i2c_client *client,
+			    const struct i2c_device_id *id)
+{
+	struct device_node *np = client->dev.of_node;
+	int gpio_elan_cs, gpio_elan_rst, err = 0;
+
+	if (!np)
+		return -ENODEV;
+
+	elan_touch_data.intr_gpio = of_get_named_gpio(np, "gpio_intr", 0);
+	if (!gpio_is_valid(elan_touch_data.intr_gpio))
+		return -ENODEV;
+
+	err = devm_gpio_request_one(&client->dev, elan_touch_data.intr_gpio,
+				GPIOF_IN, "gpio_elan_intr");
+	if (err < 0) {
+		dev_err(&client->dev,
+			"request gpio failed: %d\n", err);
+		return err;
+	}
+
+	/* elan touch init */
+	gpio_elan_cs = of_get_named_gpio(np, "gpio_elan_cs", 0);
+	if (!gpio_is_valid(gpio_elan_cs))
+		return -ENODEV;
+
+	err = devm_gpio_request_one(&client->dev, gpio_elan_cs,
+				GPIOF_OUT_INIT_HIGH, "gpio_elan_cs");
+	if (err < 0) {
+		dev_err(&client->dev,
+			"request gpio failed: %d\n", err);
+		return err;
+	}
+	gpio_set_value(gpio_elan_cs, 0);
+
+	gpio_elan_rst = of_get_named_gpio(np, "gpio_elan_rst", 0);
+	if (!gpio_is_valid(gpio_elan_rst))
+		return -ENODEV;
+
+	err = devm_gpio_request_one(&client->dev, gpio_elan_rst,
+				GPIOF_OUT_INIT_HIGH, "gpio_elan_rst");
+	if (err < 0) {
+		dev_err(&client->dev,
+			"request gpio failed: %d\n", err);
+		return err;
+	}
+	gpio_set_value(gpio_elan_rst, 0);
+	msleep(10);
+	gpio_set_value(gpio_elan_rst, 1);
+
+	gpio_set_value(gpio_elan_cs, 1);
+	msleep(100);
+
+	elan_wq = create_singlethread_workqueue("elan_wq");
+	if (!elan_wq) {
+		err = -ENOMEM;
+		goto fail;
+	}
+
+	elan_touch_data.client = client;
+	strlcpy(client->name, ELAN_TS_NAME, I2C_NAME_SIZE);
+
+	INIT_WORK(&elan_touch_data.work, elan_touch_work_func);
+
+	elan_touch_data.input = input_allocate_device();
+	if (elan_touch_data.input == NULL) {
+		err = -ENOMEM;
+		goto fail;
+	}
+
+	err = __elan_touch_init(client);
+	if (err < 0) {
+		dev_err(&client->dev, "elan - Read Hello Packet Failed\n");
+		goto fail;
+	}
+
+	elan_touch_data.input->name = ELAN_TS_NAME;
+	elan_touch_data.input->id.bustype = BUS_I2C;
+
+	set_bit(EV_SYN, elan_touch_data.input->evbit);
+
+	set_bit(EV_KEY, elan_touch_data.input->evbit);
+	set_bit(BTN_TOUCH, elan_touch_data.input->keybit);
+	set_bit(BTN_2, elan_touch_data.input->keybit);
+
+	set_bit(EV_ABS, elan_touch_data.input->evbit);
+	set_bit(ABS_X, elan_touch_data.input->absbit);
+	set_bit(ABS_Y, elan_touch_data.input->absbit);
+	set_bit(ABS_HAT0X, elan_touch_data.input->absbit);
+	set_bit(ABS_HAT0Y, elan_touch_data.input->absbit);
+
+	input_set_abs_params(elan_touch_data.input, ABS_X, 0, ELAN_USER_X_MAX,
+			     0, 0);
+	input_set_abs_params(elan_touch_data.input, ABS_Y, 0, ELAN_USER_Y_MAX,
+			     0, 0);
+	input_set_abs_params(elan_touch_data.input, ABS_HAT0X, 0,
+			     ELAN_USER_X_MAX, 0, 0);
+	input_set_abs_params(elan_touch_data.input, ABS_HAT0Y, 0,
+			     ELAN_USER_Y_MAX, 0, 0);
+
+	err = input_register_device(elan_touch_data.input);
+	if (err < 0)
+		goto fail;
+
+	elan_touch_register_interrupt(elan_touch_data.client);
+
+	return 0;
+
+fail:
+	input_free_device(elan_touch_data.input);
+	if (elan_wq)
+		destroy_workqueue(elan_wq);
+	return err;
+}
+
+static int elan_touch_remove(struct i2c_client *client)
+{
+	if (elan_wq)
+		destroy_workqueue(elan_wq);
+
+	input_unregister_device(elan_touch_data.input);
+
+	if (elan_touch_data.use_irq)
+		free_irq(client->irq, client);
+	else
+		hrtimer_cancel(&elan_touch_data.timer);
+	return 0;
+}
+
+/* -------------------------------------------------------------------- */
+static const struct i2c_device_id elan_touch_id[] = {
+	{"elan-touch", 0},
+	{}
+};
+
+static const struct of_device_id elan_dt_ids[] = {
+	{
+		.compatible = "elan,elan-touch",
+	}, {
+		/* sentinel */
+	}
+};
+MODULE_DEVICE_TABLE(of, elan_dt_ids);
+
+static int elan_suspend(struct device *dev)
+{
+	return 0;
+}
+
+static int elan_resume(struct device *dev)
+{
+	uint8_t buf[IDX_PACKET_SIZE] = { 0 };
+
+	if (0 == elan_touch_detect_int_level()) {
+		dev_dbg(dev, "Got touch during suspend period.\n");
+		/*
+		 * if touch screen during suspend, recv and drop the
+		 * data, then touch interrupt pin will return high after
+		 * receving data.
+		 */
+		elan_touch_recv_data(elan_touch_data.client, buf);
+	}
+
+	return 0;
+}
+
+static const struct dev_pm_ops elan_dev_pm_ops = {
+	.suspend = elan_suspend,
+	.resume  = elan_resume,
+};
+
+static struct i2c_driver elan_touch_driver = {
+	.probe = elan_touch_probe,
+	.remove = elan_touch_remove,
+	.id_table = elan_touch_id,
+	.driver = {
+		   .name = "elan-touch",
+		   .owner = THIS_MODULE,
+		   .of_match_table = elan_dt_ids,
+#ifdef CONFIG_PM
+		   .pm = &elan_dev_pm_ops,
+#endif
+		   },
+};
+
+static int __init elan_touch_init(void)
+{
+	return i2c_add_driver(&elan_touch_driver);
+}
+
+static void __exit elan_touch_exit(void)
+{
+	i2c_del_driver(&elan_touch_driver);
+}
+
+module_init(elan_touch_init);
+module_exit(elan_touch_exit);
+
+MODULE_AUTHOR("Stanley Zeng <stanley.zeng@emc.com.tw>");
+MODULE_DESCRIPTION("ELAN Touch Screen driver");
+MODULE_LICENSE("GPL");