Message-Id: <1452828656-16760-1-git-send-email-jeffrey.lin@rad-ic.com>
Date:	Fri, 15 Jan 2016 11:30:56 +0800
From:	Jeffrey Lin <yajohn@...il.com>
To:	dmitry.torokhov@...il.com, rydberg@...omail.se,
	dianders@...omium.org, bleung@...omium.org, scott.liu@....com.tw
Cc:	jeffrey.lin@...-ic.com, roger.yang@...-ic.com, KP.li@...-ic.com,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: [PATCH] driver: input :touchscreen : add Raydium I2C touch driver

This patch is porting Raydium I2C touch driver. Developer can enable raydium touch driver by modifying define
"CONFIG_TOUCHSCREEN_RM_TS".

Signed-off-by: jeffrey.lin <jeffrey.lin@...-ic.com>
---
 drivers/input/touchscreen/Kconfig      |  11 +
 drivers/input/touchscreen/Makefile     |   1 +
 drivers/input/touchscreen/rm31100_ts.c | 784 +++++++++++++++++++++++++++++++++
 3 files changed, 796 insertions(+)
 create mode 100644 drivers/input/touchscreen/rm31100_ts.c

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 0f13e52..dcaf7e2 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -955,4 +955,15 @@ config TOUCHSCREEN_ZFORCE
 	  To compile this driver as a module, choose M here: the
 	  module will be called zforce_ts.
 
+config TOUCHSCREEN_RM_TS
+	tristate "Raydium I2C Touchscreen"
+	depends on I2C
+	help
+	  Say Y here if you have Raydium series I2C touchscreen,
+	  such as RM31100 , connected to your system.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called rm31100_ts.
 endif
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 687d5a7..3220f66 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -78,3 +78,4 @@ 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_ZFORCE)	+= zforce_ts.o
+obj-$(CONFIG_TOUCHSCREEN_RM_TS)		+= rm31100_ts.o
diff --git a/drivers/input/touchscreen/rm31100_ts.c b/drivers/input/touchscreen/rm31100_ts.c
new file mode 100644
index 0000000..0fc70f5
--- /dev/null
+++ b/drivers/input/touchscreen/rm31100_ts.c
@@ -0,0 +1,784 @@
+/*
+ * Raydium RM31100_ts touchscreen driver.
+ *
+ * Copyright (C) 2012-2014, Raydium Semiconductor Corporation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2, and only 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.
+ *
+ * Raydium reserves the right to make changes without further notice
+ * to the materials described herein. Raydium does not assume any
+ * liability arising out of the application described herein.
+ *
+ * Contact Raydium Semiconductor Corporation at www.rad-ic.com
+ *
+ */
+#include <linux/async.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/uaccess.h>
+#include <asm/unaligned.h>
+#include <linux/input/mt.h>
+#include <linux/regulator/consumer.h>
+
+#define rm31100	0x0
+#define rm3110x	0x1
+
+#define INVALID_DATA	0xff
+#define MAX_REPORT_TOUCHED_POINTS	10
+
+#define I2C_CLIENT_ADDR         0x39
+#define I2C_DMA_CLIENT_ADDR     0x5A
+
+struct rm31100_ts_data {
+	u8 x_index;
+	u8 y_index;
+	u8 z_index;
+	u8 id_index;
+	u8 touch_index;
+	u8 data_reg;
+	u8 status_reg;
+	u8 data_size;
+	u8 touch_bytes;
+	u8 update_data;
+	u8 touch_meta_data;
+	u8 finger_size;
+};
+
+struct rm3110x_ts_platform_data {
+	u32 dis_min_x; /* display resoltion ABS min*/
+	u32 dis_max_x;/* display resoltion ABS max*/
+	u32 dis_min_y;
+	u32 dis_max_y;
+	u32 res_x; /* TS resolution unit*/
+	u32 res_y;
+	u32 swap_xy;
+	u8 nfingers;
+	bool wakeup;
+};
+
+static struct rm31100_ts_data devices[] = {
+	[0] = {
+		.x_index = 2,
+		.y_index = 4,
+		.z_index = 6,
+		.id_index = 1,
+		.data_reg = 0x1,
+		.status_reg = 0,
+		.update_data = 0x0,
+		.touch_bytes = 6,
+		.touch_meta_data = 1,
+		.finger_size = 70,
+	},
+	[1] = {
+		.x_index = 2,
+		.y_index = 4,
+		.z_index = 6,
+		.id_index = 1,
+		.data_reg = 0x0,
+		.status_reg = 0,
+		.update_data = 0x0,
+		.touch_bytes = 6,
+		.touch_meta_data = 1,
+		.finger_size = 70,
+	},
+};
+
+struct rm31100_ts {
+	struct i2c_client *client;
+	struct input_dev *input;
+	struct regulator *dvdd;
+	struct regulator *avdd;
+	struct gpio_desc *resout_gpio;
+	struct rm3110x_ts_platform_data *pdata;
+	struct rm31100_ts_data *dd;
+	u8 *touch_data;
+	u8 device_id;
+	bool is_suspended;
+	struct mutex access_lock;
+	u32 pen_irq;
+	u8 fw_version;
+	u8 u8_sub_version;
+};
+
+static int rm31100_ts_write_reg_u8(struct i2c_client *client, u8 reg, u8 val)
+{
+	int data;
+
+	data = i2c_smbus_write_byte_data(client, reg, val);
+	if (data < 0)
+		dev_err(&client->dev, "error %d in writing reg 0x%x\n",
+						 data, reg);
+
+	return data;
+}
+
+static int rm31100_ts_read_reg_u8(struct i2c_client *client, u8 reg)
+{
+	int data;
+
+	data = i2c_smbus_read_byte_data(client, reg);
+	if (data < 0)
+		dev_err(&client->dev, "error %d in reading reg 0x%x\n",
+						 data, reg);
+
+	return data;
+}
+
+static int rm31100_ts_read(struct i2c_client *client, u8 reg, u8 *buf, int num)
+{
+	struct i2c_msg xfer_msg[2];
+
+	xfer_msg[0].addr = client->addr;
+	xfer_msg[0].len = 1;
+	xfer_msg[0].flags = 0;
+	xfer_msg[0].buf = &reg;
+
+	xfer_msg[1].addr = client->addr;
+	xfer_msg[1].len = num;
+	xfer_msg[1].flags = I2C_M_RD;
+	xfer_msg[1].buf = buf;
+
+	return i2c_transfer(client->adapter, xfer_msg, num);
+}
+
+static int rm31100_ts_write(struct i2c_client *client, u8 *buf, int num)
+{
+	struct i2c_msg xfer_msg[1];
+
+	xfer_msg[0].addr = client->addr;
+	xfer_msg[0].len = num;
+	xfer_msg[0].flags = 0;
+	xfer_msg[0].buf = buf;
+
+	return i2c_transfer(client->adapter, xfer_msg, num);
+}
+
+static ssize_t rm_fw_version_show(struct device *dev,
+				      struct device_attribute *attr,
+				      char *buf)
+{
+	struct rm31100_ts *info = dev_get_drvdata(dev);
+	return sprintf(buf, "Release Version %d.%0d\n",
+		info->fw_version,
+		info->u8_sub_version);
+}
+
+static DEVICE_ATTR(fw_version, S_IRUGO, rm_fw_version_show, NULL);
+
+static struct attribute *rm_ts_attributes[] = {
+	&dev_attr_fw_version.attr,
+	NULL
+};
+
+static const struct attribute_group rm_ts_attr_group = {
+	.attrs = rm_ts_attributes,
+};
+
+static void report_data(struct rm31100_ts *dev, u16 x, u16 y,
+	u8 pressure, u8 id)
+{
+	struct input_dev *input_dev = dev->input;
+	if (dev->pdata->swap_xy)
+		swap(x, y);
+
+	input_mt_slot(input_dev, id);
+	input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, true);
+	input_report_abs(input_dev, ABS_MT_POSITION_X, x);
+	input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
+	input_report_abs(input_dev, ABS_MT_PRESSURE, pressure);
+	input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, dev->dd->finger_size);
+}
+
+static void process_rm31100_data(struct rm31100_ts *ts)
+{
+	u8 id, pressure, touches, i;
+	u16 x, y;
+
+	touches = ts->touch_data[ts->dd->touch_index];
+
+	if (touches > 0) {
+		for (i = 0; i < touches; i++) {
+			id = ts->touch_data[i * ts->dd->touch_bytes +
+				ts->dd->id_index];
+			pressure = ts->touch_data[i * ts->dd->touch_bytes +
+				ts->dd->z_index];
+			x = get_unaligned_le16(&(ts->touch_data[i *
+				ts->dd->touch_bytes + ts->dd->x_index]));
+			y = get_unaligned_le16(&(ts->touch_data[i *
+				ts->dd->touch_bytes + ts->dd->y_index]));
+			report_data(ts, x, y, pressure, id);
+		}
+	} else
+		input_mt_sync(ts->input);
+
+	input_mt_report_pointer_emulation(ts->input, true);
+	input_sync(ts->input);
+}
+
+static int rm31100_ts_xy_worker(struct rm31100_ts *work)
+{
+	int rc;
+	struct rm31100_ts *ts = work;
+
+	/* read data from DATA_REG */
+	rc = rm31100_ts_read(ts->client, ts->dd->data_reg, ts->touch_data,
+	ts->dd->data_size);
+
+	if (rc < 0) {
+		dev_err(&ts->client->dev, "read failed\n");
+		goto schedule;
+	}
+
+	if (ts->touch_data[ts->dd->touch_index] == INVALID_DATA)
+		goto schedule;
+
+	/* write to STATUS_REG to release lock */
+	rc = rm31100_ts_write_reg_u8(ts->client,
+		ts->dd->status_reg, ts->dd->update_data);
+	if (rc < 0) {
+		dev_err(&ts->client->dev, "write failed, try once more\n");
+
+		rc = rm31100_ts_write_reg_u8(ts->client,
+			ts->dd->status_reg, ts->dd->update_data);
+		if (rc < 0)
+			dev_err(&ts->client->dev, "write failed, exiting\n");
+	}
+
+	process_rm31100_data(ts);
+schedule:
+	return rc;
+}
+
+static irqreturn_t rm31100_ts_irq(int irq, void *dev_id)
+{
+	struct rm31100_ts *ts = dev_id;
+	struct device *dev = &ts->client->dev;
+	int rc;
+
+	rc = rm31100_ts_xy_worker(ts);
+	if (rc < 0) {
+		dev_err(dev, "Handling message fails in IRQ, %d.\n",
+			rc);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int rm_ts_power_on(struct rm31100_ts *ts)
+{
+	int error;
+
+	/*
+	 * If we do not have reset gpio assume platform firmware
+	 * controls regulators and does power them on for us.
+	 */
+	if (IS_ERR_OR_NULL(ts->resout_gpio))
+		return 0;
+
+	gpiod_set_value_cansleep(ts->resout_gpio, 1);
+
+	error = regulator_enable(ts->avdd);
+	if (error) {
+		dev_err(&ts->client->dev,
+			"failed to enable avdd regulator: %d\n",
+			error);
+		goto release_reset_gpio;
+	}
+
+	error = regulator_enable(ts->dvdd);
+	if (error) {
+		dev_err(&ts->client->dev,
+			"failed to enable dvdd regulator: %d\n",
+			error);
+		regulator_disable(ts->dvdd);
+		goto release_reset_gpio;
+	}
+
+release_reset_gpio:
+	gpiod_set_value_cansleep(ts->resout_gpio, 0);
+	if (error)
+		return error;
+
+	msleep(20);
+
+	return 0;
+}
+
+static void rm_ts_power_off(void *_data)
+{
+	struct rm31100_ts *data = _data;
+
+	if (!IS_ERR_OR_NULL(data->resout_gpio)) {
+		/*
+		 * Activate reset gpio to prevent leakage through the
+		 * pin once we shut off power to the controller.
+		 */
+		gpiod_set_value_cansleep(data->resout_gpio, 1);
+		regulator_disable(data->avdd);
+		regulator_disable(data->dvdd);
+	}
+}
+
+static int rm31100_ts_init_ts(struct i2c_client *client, struct rm31100_ts *ts)
+{
+	/*struct input_dev *input_device;*/
+	/*int rc = 0;*/
+
+	ts->dd = &devices[ts->device_id];
+
+	if (!ts->pdata->nfingers) {
+		dev_err(&client->dev, "Touches information not specified\n");
+		return -EINVAL;
+	}
+
+	if (ts->device_id == rm3110x) {
+		if (ts->pdata->nfingers > 2) {
+			dev_err(&client->dev, "Touches >=1 & <= 2\n");
+			return -EINVAL;
+		}
+		ts->dd->data_size = ts->dd->touch_bytes;
+		ts->dd->touch_index = 0x0;
+	} else if (ts->device_id == rm31100) {
+		if (ts->pdata->nfingers > 10) {
+			dev_err(&client->dev, "Touches >=1 & <= 10\n");
+			return -EINVAL;
+		}
+		ts->dd->data_size = ts->pdata->nfingers * ts->dd->touch_bytes +
+						ts->dd->touch_meta_data;
+		ts->dd->touch_index = 0x0;
+	}
+	/* w001 */
+	else {
+		ts->dd->data_size = ts->pdata->nfingers * ts->dd->touch_bytes +
+		ts->dd->touch_meta_data;
+		ts->dd->touch_index = 0x0;
+	}
+
+	ts->touch_data = kzalloc(ts->dd->data_size, GFP_KERNEL);
+	if (!ts->touch_data) {
+		pr_err("%s: Unable to allocate memory\n", __func__);
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+static void __maybe_unused rm_enter_sleep(struct rm31100_ts *data)
+{
+	const u8 sleep_cmd[] = { 0x5A, 0xff, 0x00, 0x0f };
+	int rc;
+
+	rc = rm31100_ts_write(data->client, (u8 *)sleep_cmd,
+		ARRAY_SIZE(sleep_cmd));
+	if (rc)
+		dev_err(&data->client->dev,
+			"Send sleep failed: %d\n", rc);
+}
+
+static int __maybe_unused rm31100_ts_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct rm31100_ts *ts = i2c_get_clientdata(client);
+
+	disable_irq(ts->pen_irq);
+
+	if (device_may_wakeup(dev)) {
+		rm_enter_sleep(ts);
+		/* mark suspend flag */
+		ts->is_suspended = (enable_irq_wake(ts->pen_irq) == 0);
+	} else
+		rm_ts_power_off(ts);
+
+	return 0;
+}
+
+static int __maybe_unused rm31100_ts_resume(struct device *dev)
+{
+	struct rm31100_ts *ts = dev_get_drvdata(dev);
+
+	int rc = 0;
+
+	if (device_may_wakeup(dev)) {
+		disable_irq_wake(ts->pen_irq);
+
+		ts->is_suspended = false;
+	} else {
+		rc = rm_ts_power_on(ts);
+		if (rc) {
+			dev_err(dev, "unable to resume\n");
+			return rc;
+		}
+
+		enable_irq(ts->pen_irq);
+
+		/* Clear the status register of the TS controller */
+		rc = rm31100_ts_write_reg_u8(ts->client,
+			ts->dd->status_reg, ts->dd->update_data);
+		if (rc < 0) {
+			dev_err(&ts->client->dev,
+				"write failed, try once more\n");
+
+			rc = rm31100_ts_write_reg_u8(ts->client,
+				ts->dd->status_reg,
+				ts->dd->update_data);
+			if (rc < 0)
+				dev_err(&ts->client->dev,
+					"write failed, exiting\n");
+		}
+	}
+
+	return 0;
+}
+
+static void rm_ts_remove_sysfs_group(void *_data)
+{
+	struct rm31100_ts *ts = _data;
+
+	sysfs_remove_group(&ts->client->dev.kobj, &rm_ts_attr_group);
+}
+
+static SIMPLE_DEV_PM_OPS(rm31100_ts_pm_ops,
+			 rm31100_ts_suspend, rm31100_ts_resume);
+
+static int rm_input_dev_create(struct rm31100_ts *ts)
+{
+	struct input_dev *input_device;
+	int rc = 0;
+
+	input_device = input_allocate_device();
+	if (!input_device) {
+		rc = -ENOMEM;
+		goto error_alloc_dev;
+	}
+	ts->input = input_device;
+
+	input_device->name = "raydium_ts";
+	input_device->id.bustype = BUS_I2C;
+	input_device->dev.parent = &ts->client->dev;
+	input_set_drvdata(input_device, ts);
+
+	__set_bit(BTN_TOUCH, input_device->keybit);
+	__set_bit(EV_ABS, input_device->evbit);
+	__set_bit(EV_KEY, input_device->evbit);
+
+	/* For single touch */
+	input_set_abs_params(input_device, ABS_X,
+			     ts->pdata->dis_min_x, ts->pdata->dis_max_x, 0, 0);
+	input_set_abs_params(input_device, ABS_Y,
+			     ts->pdata->dis_min_x, ts->pdata->dis_max_y, 0, 0);
+	input_set_abs_params(input_device, ABS_PRESSURE,
+			     0, 255, 0, 0);
+	input_abs_set_res(input_device, ABS_X, ts->pdata->res_x);
+	input_abs_set_res(input_device, ABS_Y, ts->pdata->res_y);
+
+	/* Multitouch input params setup */
+	rc = input_mt_init_slots(input_device,
+		MAX_REPORT_TOUCHED_POINTS,
+		INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+	if (rc)
+		goto error_unreg_device;
+
+	input_set_abs_params(input_device, ABS_MT_POSITION_X,
+		ts->pdata->dis_min_x, ts->pdata->dis_max_x, 0, 0);
+	input_set_abs_params(input_device, ABS_MT_POSITION_Y,
+		ts->pdata->dis_min_y, ts->pdata->dis_max_y, 0, 0);
+	input_set_abs_params(input_device, ABS_MT_PRESSURE,
+		0, 0xFF, 0, 0);
+	input_set_abs_params(input_device, ABS_MT_TOUCH_MAJOR,
+		0, 0xFF, 0, 0);
+	input_abs_set_res(input_device, ABS_MT_POSITION_X, ts->pdata->res_x);
+	input_abs_set_res(input_device, ABS_MT_POSITION_Y, ts->pdata->res_y);
+
+	rc = input_register_device(input_device);
+	if (rc)
+		goto error_unreg_device;
+
+	return 0;
+
+error_unreg_device:
+	input_free_device(input_device);
+error_alloc_dev:
+	ts->input = NULL;
+	return rc;
+}
+
+static int rm31100_initialize(struct i2c_client *client)
+{
+	struct rm31100_ts *ts = i2c_get_clientdata(client);
+	int rc = 0, temp_reg;
+
+	/* read one byte to make sure i2c device exists */
+	if (ts->device_id == rm3110x)
+		temp_reg = 0x01;
+	else if (ts->device_id == rm31100)
+		temp_reg = 0x00;
+	else
+		temp_reg = 0x05;
+
+	rc = rm31100_ts_read_reg_u8(client, temp_reg);
+	if (rc < 0) {
+		dev_err(&client->dev, "i2c sanity check failed\n");
+		return rc;
+	}
+
+	rc = rm31100_ts_init_ts(client, ts);
+	if (rc < 0) {
+		dev_err(&client->dev, "rm31100_ts init failed\n");
+		return rc;
+	}
+
+	return 0;
+}
+
+static int rm31100_ts_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct rm31100_ts *ts;
+	struct rm3110x_ts_platform_data *pdata = client->dev.platform_data;
+	int rc;
+	union i2c_smbus_data dummy;
+
+	ts = devm_kzalloc(&client->dev, sizeof(struct rm31100_ts), GFP_KERNEL);
+	if (!ts) {
+		dev_err(&client->dev, "Failed to allocate memory\n");
+		return -ENOMEM;
+	}
+
+	if (!i2c_check_functionality(client->adapter,
+		I2C_FUNC_SMBUS_READ_WORD_DATA)) {
+		dev_err(&client->dev, "I2C functionality not supported\n");
+		rc = -EIO;
+		goto error_touch_data_alloc;
+	}
+
+	ts->client = client;
+	ts->pdata = pdata;
+	i2c_set_clientdata(client, ts);
+	ts->device_id = id->driver_data;
+
+	ts->is_suspended = false;
+
+	mutex_init(&ts->access_lock);
+
+	ts->avdd = devm_regulator_get(&client->dev, "avdd");
+	if (IS_ERR(ts->avdd)) {
+		rc = PTR_ERR(ts->avdd);
+		if (rc != -EPROBE_DEFER)
+			dev_err(&client->dev,
+				"Failed to get 'avdd' regulator: %d\n",
+				rc);
+		return rc;
+	}
+
+	ts->dvdd = devm_regulator_get(&client->dev, "dvdd");
+	if (IS_ERR(ts->dvdd)) {
+		rc = PTR_ERR(ts->dvdd);
+		if (rc != -EPROBE_DEFER)
+			dev_err(&client->dev,
+				"Failed to get 'dvdd' regulator: %d\n",
+				rc);
+		return rc;
+	}
+#if 1
+	ts->resout_gpio = devm_gpiod_get(&client->dev, "rm31100_resout_gpio");
+	if (IS_ERR(ts->resout_gpio)) {
+		rc = PTR_ERR(ts->resout_gpio);
+
+		/*
+		 * On Chromebooks vendors like to source touch panels from
+		 * different vendors, but they are connected to the same
+		 * regulators/GPIO pin. The drivers also use asynchronous
+		 * probing, which means that more than one driver will
+		 * attempt to claim the reset line. If we find it busy,
+		 * let's try again later.
+		 */
+		if (rc == -EBUSY) {
+			dev_info(&client->dev,
+				 "reset gpio is busy, deferring probe\n");
+			return -EPROBE_DEFER;
+		}
+
+		if (rc == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+
+		if (rc != -ENOENT && rc != -ENOSYS) {
+			dev_err(&client->dev,
+				"failed to get reset gpio: %d\n",
+				rc);
+			return rc;
+		}
+
+	} else {
+		rc = gpiod_direction_output(ts->resout_gpio, 0);
+		if (rc) {
+			dev_err(&client->dev,
+				"failed to configure reset gpio as output: %d\n",
+				rc);
+			return rc;
+		}
+	}
+#else
+	ts->resout_gpio = devm_gpiod_get_optional(&client->dev,
+		"ts_reset", GPIOF_OUT_LOW);
+	if (IS_ERR(ts->resout_gpio)) {
+		rc = PTR_ERR(ts->resout_gpio);
+		/*
+		 * On Chromebooks vendors like to source touch panels from
+		 * different vendors, but they are connected to the same
+		 * regulators/GPIO pin. The drivers also use asynchronous
+		 * probing, which means that more than one driver will
+		 * attempt to claim the reset line. If we find it busy,
+		 * let's try again later.
+		 */
+		if (rc == -EBUSY) {
+			dev_info(&client->dev,
+				 "reset gpio is busy, deferring probe\n");
+			return -EPROBE_DEFER;
+		}
+
+		if (rc == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+
+		if (rc != -ENOENT && rc != -ENOSYS) {
+			dev_err(&client->dev,
+				"failed to get reset gpio: %d\n",
+				rc);
+			return rc;
+		}
+	}
+#endif
+	rc = rm_ts_power_on(ts);
+	if (rc)
+		return rc;
+
+	rc = devm_add_action(&client->dev, rm_ts_power_off, ts);
+	if (rc) {
+		dev_err(&client->dev,
+			"failed to install power off action: %d\n", rc);
+		rm_ts_power_off(ts);
+		return rc;
+	}
+
+	/* Make sure there is something at this address */
+	if (i2c_smbus_xfer(client->adapter, client->addr, 0,
+		I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0)
+		return -ENODEV;
+
+	rc = rm31100_initialize(client);
+	if (rc < 0) {
+		dev_err(&client->dev, "probe failed! unbind device.\n");
+		return rc;
+	}
+
+	rc = rm_input_dev_create(ts);
+	if (rc) {
+		dev_err(&client->dev, "%s crated failed, %d\n", __func__, rc);
+		return rc;
+	}
+
+	rc = devm_request_threaded_irq(&client->dev, ts->pen_irq,
+					NULL, rm31100_ts_irq,
+					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+					client->name, ts);
+	if (rc) {
+		dev_err(&client->dev, "Failed to register interrupt\n");
+		return rc;
+	}
+
+	rc = sysfs_create_group(&client->dev.kobj, &rm_ts_attr_group);
+	if (rc) {
+		dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
+			rc);
+		return rc;
+	}
+
+	rc = devm_add_action(&client->dev,
+				rm_ts_remove_sysfs_group, ts);
+	if (rc) {
+		rm_ts_remove_sysfs_group(ts);
+		dev_err(&client->dev,
+			"Failed to add sysfs cleanup action: %d\n",
+			rc);
+		return rc;
+	}
+	return 0;
+
+error_touch_data_alloc:
+	return rc;
+}
+
+static int rm31100_ts_remove(struct i2c_client *client)
+{
+	struct rm31100_ts *ts = i2c_get_clientdata(client);
+
+	device_init_wakeup(&client->dev, 0);
+
+	devm_free_irq(&client->dev, ts->pen_irq, ts);
+
+	input_unregister_device(ts->input);
+
+	mutex_destroy(&ts->access_lock);
+
+	rm_ts_power_off(ts);
+
+	kfree(ts->touch_data);
+	kfree(ts);
+
+	return 0;
+}
+
+static const struct i2c_device_id rm31100_ts_id[] = {
+	{"RM31100", 0},
+	{"RM3110x", 1},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, rm31100_ts_id);
+
+
+static struct i2c_driver rm31100_ts_driver = {
+	.probe = rm31100_ts_probe,
+	.remove = rm31100_ts_remove,
+	.id_table = rm31100_ts_id,
+	.driver = {
+		.name = "raydium_ts",
+	},
+};
+
+static int __init rm31100_ts_init(void)
+{
+	int rc;
+
+	rc = i2c_add_driver(&rm31100_ts_driver);
+
+	return rc;
+}
+/* Making this as late init to avoid power fluctuations
+ * during LCD initialization.
+ */
+module_init(rm31100_ts_init);
+
+static void __exit rm31100_ts_exit(void)
+{
+	i2c_del_driver(&rm31100_ts_driver);
+}
+module_exit(rm31100_ts_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("rm31100-rm3110x touchscreen controller driver");
+MODULE_AUTHOR("Raydium");
+MODULE_ALIAS("platform:rm31100_ts");
-- 
2.1.2

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