ENGR00268115-1 input: copy the elan touch driver from 3.0.35

Driver copied from branch imx_3.0.35:

 commit 1c584293e60f067f6e10db6e8afd880aeade25aa
 ts: fix elan touch screen gets no response upon suspend/resume

Fixed style warning reported by review-commits:

+	if (rc < 0) {
+		return -EINVAL;
+	}

WARNING: printk() should include KERN_ facility level
+		printk("hello packet: [0x%02x 0x%02x 0x%02x 0x%02x]\n",

WARNING: braces {} are not necessary for single statement blocks
+	if (rc != bytes_to_recv) {
+		return -EINVAL;
+	}

....

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

3 files changed, 429 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index b4856d7ffd71..03498beec7a7 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -247,6 +247,18 @@ config TOUCHSCREEN_EGALAX
 	  To compile this driver as a module, choose M here: the
 	  module will be called egalax_ts.
 
+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_EGALAX_SINGLE_TOUCH
 	bool "EETI eGalax touchscreen as single-touch"
 	default N
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index eb8bfe1c1a46..1d67ce167371 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -71,3 +71,4 @@ obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE)	+= mainstone-wm97xx.o
 obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE)	+= zylonite-wm97xx.o
 obj-$(CONFIG_TOUCHSCREEN_W90X900)	+= w90p910_ts.o
 obj-$(CONFIG_TOUCHSCREEN_TPS6507X)	+= tps6507x-ts.o
+obj-$(CONFIG_TOUCHSCREEN_ELAN)		+= elan_ts.o
diff --git a/drivers/input/touchscreen/elan_ts.c b/drivers/input/touchscreen/elan_ts.c
new file mode 100644
index 000000000000..93da8f240a58
--- /dev/null
+++ b/drivers/input/touchscreen/elan_ts.c
@@ -0,0 +1,416 @@
+/*
+ * 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/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)
+{
+	unsigned 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)
+{
+	int err = 0;
+
+	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.intr_gpio = irq_to_gpio(client->irq);
+	pr_info("irq_to_gpio irq %d, gpio %d\n", client->irq,
+		 elan_touch_data.intr_gpio);
+
+	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 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,
+#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");