[PATCH] driver: input :touchscreen : add Raydium I2C touch driver

[jeffrey.lin]

Raydium I2C touch driver.

Signed-off-by: jeffrey.lin <jeffrey.lin@xxxxxxxxxx>
---
 .../devicetree/bindings/input/raydium_i2c_ts.txt   |  23 +
 .../devicetree/bindings/vendor-prefixes.txt        |   1 +
 drivers/input/touchscreen/Kconfig                  |  12 +
 drivers/input/touchscreen/Makefile                 |   1 +
 drivers/input/touchscreen/raydium_i2c_ts.c         | 932 +++++++++++++++++++++
 5 files changed, 969 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/raydium_i2c_ts.txt
 create mode 100644 drivers/input/touchscreen/raydium_i2c_ts.c

diff --git a/Documentation/devicetree/bindings/input/raydium_i2c_ts.txt b/Documentation/devicetree/bindings/input/raydium_i2c_ts.txt
new file mode 100644
index 0000000..329864d
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/raydium_i2c_ts.txt
@@ -0,0 +1,23 @@
+Raydium I2C touchscreen
+
+Required properties:
+- compatible:
+    "raydium,rm31100"
+
+- reg: The I2C address of the device
+- interrupts: interrupt to which the chip is connected
+    See ../interrupt-controller/interrupts.txt
+Optional property:
+ - avdd-supply	: Analog power supply needed to power device
+ - vccio-supply: IO Power source
+
+Example:
+
+	raydium_i2c@0x39 {
+		compatible = "raydium,rm31100";
+		avdd-supply = <&pm8226_l19>;
+		vccio-supply = <&pm8226_lvs1>;
+		reg = <0x39>;
+		interrupt-parent = <&gpio>;
+		interrupts = <0x0 IRQ_TYPE_EDGE_FALLING>;
+	};
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index af49e0f..5b6224b 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -126,6 +126,7 @@ radxa	Radxa
 raidsonic	RaidSonic Technology GmbH
 ralink	Mediatek/Ralink Technology Corp.
 ramtron	Ramtron International
+raydium Raydium Semiconductor Corp.
 realtek Realtek Semiconductor Corp.
 renesas	Renesas Electronics Corporation
 ricoh	Ricoh Co. Ltd.
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 3f3f6ee..ab28721 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -915,6 +915,18 @@ config TOUCHSCREEN_PCAP
 	  To compile this driver as a module, choose M here: the
 	  module will be called pcap_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 raydium_i2c_ts.
+
 config TOUCHSCREEN_ST1232
 	tristate "Sitronix ST1232 touchscreen controllers"
 	depends on I2C
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 4941f2d..99e08cf 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -55,6 +55,7 @@ obj-$(CONFIG_TOUCHSCREEN_USB_COMPOSITE)	+= usbtouchscreen.o
 obj-$(CONFIG_TOUCHSCREEN_PCAP)		+= pcap_ts.o
 obj-$(CONFIG_TOUCHSCREEN_PENMOUNT)	+= penmount.o
 obj-$(CONFIG_TOUCHSCREEN_PIXCIR)	+= pixcir_i2c_ts.o
+obj-$(CONFIG_TOUCHSCREEN_RM_TS)		+= raydium_i2c_ts.o
 obj-$(CONFIG_TOUCHSCREEN_S3C2410)	+= s3c2410_ts.o
 obj-$(CONFIG_TOUCHSCREEN_ST1232)	+= st1232.o
 obj-$(CONFIG_TOUCHSCREEN_STMPE)		+= stmpe-ts.o
diff --git a/drivers/input/touchscreen/raydium_i2c_ts.c b/drivers/input/touchscreen/raydium_i2c_ts.c
new file mode 100644
index 0000000..69a0388
--- /dev/null
+++ b/drivers/input/touchscreen/raydium_i2c_ts.c
@@ -0,0 +1,932 @@
+/*
+ * Raydium touchscreen I2C 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/module.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/firmware.h>
+#include <linux/input/mt.h>
+#include <linux/acpi.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+#include <asm/unaligned.h>
+#include <linux/gpio/consumer.h>
+
+/* Device, Driver information */
+#define DEVICE_NAME	"rm31100"
+
+/* Slave I2C mode*/
+#define RM_BOOT_BLDR	0x02
+#define RM_BOOT_MAIN	0x03
+
+/*I2C command */
+#define CMD_QUERY_BANK		0x2B
+#define CMD_DATA_BANK		0x4D
+#define CMD_ENTER_SLEEP		0x4E
+#define CMD_BOOT_ACK		0x0A
+#define CMD_BOOT_WRT		0x5B
+#define CMD_BOOT_CHK		0x0C
+#define CMD_BANK_SWITCH		0xAA
+
+/* Touch relative info */
+#define MAX_RETRIES		3
+#define MAX_FW_UPDATE_RETRIES	30
+#define MAX_TOUCH_NUM		10
+#define MAX_PACKET_SIZE		60
+#define BOOT_DELAY_MS	100
+
+#define RAYDIUM_FW_PAGESIZE	128
+#define RAYDIUM_POWERON_DELAY_USEC	500
+#define RAYDIUM_RESET_DELAY_MSEC	50
+
+#define ADDR_INDEX		0x03
+#define DATA_INDEX		0x04
+
+#define HEADER_SIZE		4
+
+enum raydium_boot_mode {
+	RAYDIUM_TS_MAIN = 0,
+	RAYDIUM_TS_BLDR,
+};
+
+enum raydium_abs_idx {
+	POS_STATE = 0,/*1:touch, 0:no touch*/
+	POS_X,
+	POS_Y = 3,
+	POS_PRESSURE,
+	WIDTH_X,
+	WIDTH_Y,
+};
+
+struct raydium_info {
+	u32 hw_ver;	/*device ver, __le32*/
+	u8 main_ver;
+	u8 sub_ver;
+	u16 ft_ver;	/*test ver, __le16*/
+	u8 x_num;
+	u8 y_num;
+	u16 x_max;	/*disp reso, __le16*/
+	u16 y_max;	/*disp reso, __le16*/
+	u8 x_res;		/* units/mm */
+	u8 y_res;		/* units/mm */
+};
+
+struct raydium_object {
+	u32 data_bank_addr;
+	u8 pkg_size;
+	u8 tp_info_size;
+};
+
+/* struct raydium_data - represents state of Raydium touchscreen device */
+struct raydium_data {
+	struct i2c_client *client;
+	struct input_dev *input;
+
+	struct regulator *avdd;
+	struct regulator *vccio;
+	struct gpio_desc *reset_gpio;
+
+	u32 query_bank_info;
+
+	struct raydium_info info;
+	struct raydium_object obj;
+	enum raydium_boot_mode boot_mode;
+
+	struct mutex sysfs_mutex;
+	struct completion cmd_done;
+
+	bool wake_irq_enabled;
+};
+
+static int raydium_i2c_send(struct i2c_client *client,
+	u8 addr, u8 *data, size_t len)
+{
+	u8 buf[MAX_PACKET_SIZE + 1];
+	int tries = 0;
+
+	if (len > MAX_PACKET_SIZE)
+		return -EINVAL;
+
+	buf[0] = addr;
+	memcpy(&buf[1], data, len);
+
+	do {
+		if (i2c_master_send(client, buf, len + 1) == (len + 1))
+			return 0;
+		msleep(20);
+	} while (++tries < MAX_RETRIES);
+
+	dev_err(&client->dev, "%s: i2c send failed\n", __func__);
+
+	return -EIO;
+}
+
+static int raydium_i2c_read(struct i2c_client *client,
+	u8 addr, size_t len, void *data)
+{
+	struct i2c_msg xfer[2];
+	int ret;
+
+	/* Write register */
+	xfer[0].addr = client->addr;
+	xfer[0].flags = 0;
+	xfer[0].len = 1;
+	xfer[0].buf = &addr;
+
+	/* Read data */
+	xfer[1].addr = client->addr;
+	xfer[1].flags = I2C_M_RD;
+	xfer[1].len = len;
+	xfer[1].buf = data;
+
+	ret = i2c_transfer(client->adapter, xfer, ARRAY_SIZE(xfer));
+	if (ret < 0)
+		return ret;
+
+	if (ret != ARRAY_SIZE(xfer))
+		return -EIO;
+
+	return 0;
+}
+
+static int raydium_i2c_read_message(struct i2c_client *client,
+	u32 addr, size_t len, void *data)
+{
+	u16 pkg_size, use_len;
+	u8 buf[HEADER_SIZE], idx_i;
+	int error;
+
+	use_len = len;
+	idx_i = 0;
+	while (use_len > 0) {
+		pkg_size = (use_len < MAX_PACKET_SIZE) ?
+			use_len : MAX_PACKET_SIZE;
+
+		put_unaligned_be32(addr, buf);
+
+		/*set data bank*/
+		error = raydium_i2c_send(client, CMD_BANK_SWITCH,
+			(u8 *)buf, HEADER_SIZE);
+		/*read potints data*/
+		if (!error)
+			error = raydium_i2c_read(client, buf[ADDR_INDEX],
+				pkg_size,
+				data + idx_i*MAX_PACKET_SIZE);
+
+		pkg_size += MAX_PACKET_SIZE;
+		addr += MAX_PACKET_SIZE;
+		use_len = (use_len < MAX_PACKET_SIZE) ?
+			0 : (use_len - MAX_PACKET_SIZE);
+		idx_i++;
+	}
+
+	return error;
+}
+
+static int raydium_i2c_send_message(struct i2c_client *client,
+	size_t len, void *data)
+{
+	int error;
+	__le32 cmd;
+
+	cmd = get_unaligned_le32(data);
+
+	/*set data bank*/
+	error = raydium_i2c_send(client, CMD_BANK_SWITCH, (u8 *)&cmd,
+		HEADER_SIZE);
+
+	/*send message*/
+	if (!error)
+		error = raydium_i2c_send(client, ((u8 *)data)[ADDR_INDEX],
+			data + DATA_INDEX, len);
+
+	return error;
+}
+
+static int raydium_i2c_sw_reset(struct i2c_client *client)
+{
+	static const u8 soft_rst_cmd[] = {0x40, 0x00, 0x00, 0x04, 0x01};
+	int error;
+
+	error = raydium_i2c_send_message(client, ARRAY_SIZE(soft_rst_cmd),
+		(void *)soft_rst_cmd);
+	if (error) {
+		dev_err(&client->dev, "software reset failed: %d\n", error);
+		return error;
+	}
+
+	msleep(RAYDIUM_RESET_DELAY_MSEC);
+
+	return 0;
+}
+
+static int raydium_i2c_query_ts_info(struct raydium_data *ts)
+{
+	struct i2c_client *client = ts->client;
+	int error, retry_cnt;
+
+	for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
+		error = raydium_i2c_read(client, CMD_DATA_BANK,
+			sizeof(ts->obj), (void *)&ts->obj);
+			ts->obj.data_bank_addr =
+				get_unaligned_le32(&ts->obj.data_bank_addr);
+
+		if (!error) {
+			error = raydium_i2c_read(client, CMD_QUERY_BANK,
+				sizeof(ts->query_bank_info),
+				(void *)&ts->query_bank_info);
+			if (!error) {
+				error = raydium_i2c_read_message(client,
+					ts->query_bank_info, sizeof(ts->info),
+					(void *)&ts->info);
+
+				ts->info.hw_ver =
+					get_unaligned_le32(&ts->info.hw_ver);
+				ts->info.ft_ver =
+					get_unaligned_le16(&ts->info.ft_ver);
+				ts->info.x_max =
+					get_unaligned_le16(&ts->info.x_max);
+				ts->info.y_max =
+					get_unaligned_le16(&ts->info.y_max);
+
+				return 0;
+			}
+		}
+	}
+	dev_err(&client->dev, "Get touch data failed: %d\n", error);
+
+	return -EINVAL;
+}
+
+static int raydium_i2c_fastboot(struct i2c_client *client)
+{
+	static const u8 boot_cmd[] = { 0x50, 0x00, 0x06, 0x20 };
+	u8 buf[HEADER_SIZE];
+	int error;
+
+	error = raydium_i2c_read_message(client,
+		get_unaligned_be32(boot_cmd),
+		sizeof(boot_cmd), buf);
+
+	if (!error) {
+		if (buf[0] == RM_BOOT_BLDR) {
+			dev_dbg(&client->dev, "boot in fastboot mode\n");
+			return -EINVAL;
+		}
+		dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr);
+		return 0;
+	}
+
+	dev_err(&client->dev, "boot failed: %d\n", error);
+
+	return error;
+}
+
+static int raydium_i2c_initialize(struct raydium_data *ts)
+{
+	struct i2c_client *client = ts->client;
+	int error, retry_cnt;
+	static const u8 recov_packet[] = { 0x04, 0x81 };
+	u8 buf[HEADER_SIZE];
+
+	for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
+		error = raydium_i2c_fastboot(client);
+		if (error) {
+			/* Continue initializing if it's the last try */
+			if (retry_cnt < MAX_RETRIES - 1)
+				continue;
+		}
+		/* Wait for Hello packet */
+		msleep(BOOT_DELAY_MS);
+
+		error = raydium_i2c_read(client, recov_packet[0], 1,
+			(void *)buf);
+		if (error) {
+			dev_err(&client->dev,
+				"failed to read 'hello' packet: %d\n", error);
+		} else if (buf[0] == recov_packet[1]) {
+			ts->boot_mode = RAYDIUM_TS_MAIN;
+			break;
+		}
+	}
+
+	if (error)
+		ts->boot_mode = RAYDIUM_TS_BLDR;
+	else
+		raydium_i2c_query_ts_info(ts);
+
+	return error;
+}
+
+static int raydium_i2c_fw_write_page(struct i2c_client *client,
+				const void *page)
+{
+	static const u8 ack_ok[] = { 0x55, 0xAA };
+	u8 buf[2];
+	int retry;
+	int error;
+
+	for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) {
+		error = raydium_i2c_send(client, CMD_BOOT_WRT,
+			(u8 *)page, RAYDIUM_FW_PAGESIZE);
+		if (error) {
+			dev_err(&client->dev,
+				"BLDR Write Page failed: %d\n", error);
+			continue;
+		}
+
+		error = raydium_i2c_read(client, CMD_BOOT_CHK, sizeof(ack_ok),
+			(void *)buf);
+		if (error) {
+			dev_err(&client->dev,
+				"BLDR Ack read failed: %d\n", error);
+			return error;
+		}
+
+		if (!memcmp(buf, ack_ok, sizeof(ack_ok)))
+			return 0;
+
+		error = -EIO;
+		dev_err(&client->dev,
+			"BLDR Get Ack Error [%02x:%02x]\n", buf[0], buf[1]);
+	}
+
+	return error;
+}
+
+static int raydium_i2c_do_update_firmware(struct i2c_client *client,
+					 const struct firmware *fw,
+					 bool force)
+{
+	static const u8 boot_cmd[] = { 0x50, 0x00, 0x06, 0x20 , RM_BOOT_BLDR };
+	static const u8 main_cmd[] = { 0x50, 0x00, 0x06, 0x20, RM_BOOT_MAIN };
+	static const u8 boot_ack[] = { 0x55, 0xAA, 0x00, 0xFF };
+	u8 buf[HEADER_SIZE];
+	int page, n_fw_pages;
+	int error;
+
+	/* Recovery mode detection! */
+	if (!force) {
+		/* Start boot loader Procedure */
+		dev_dbg(&client->dev, "Normal BLDR procedure\n");
+		/* switch to mode */
+		error = raydium_i2c_send_message(client, 1, (void *)boot_cmd);
+		if (error)
+			dev_err(&client->dev, "failed to send boot cmd: %d\n",
+				error);
+		msleep(60);
+		raydium_i2c_sw_reset(client);
+		msleep(RAYDIUM_RESET_DELAY_MSEC);
+		error = raydium_i2c_send_message(client, 1, (void *)boot_cmd);
+	}
+
+	if (error) {
+		dev_err(&client->dev, "failed to enter fastboot mode: %d\n",
+			error);
+		return error;
+	}
+
+	msleep(20);
+
+	/* check fastboot state */
+	error = raydium_i2c_read(client, CMD_BOOT_ACK,
+		sizeof(boot_ack), (void *)buf);
+	if (error) {
+		dev_err(&client->dev,
+			"failed to read boot ack: %d\n", error);
+		return error;
+	}
+
+	if (memcmp(buf, boot_ack, sizeof(boot_ack))) {
+		dev_err(&client->dev,
+			"failed to enter fastboot: %*ph (expected %*ph)\n",
+			(int)sizeof(buf), buf, (int)sizeof(boot_ack), boot_ack);
+		return -EIO;
+	}
+
+	dev_info(&client->dev, "successfully entered fastboot mode");
+
+	n_fw_pages = fw->size / RAYDIUM_FW_PAGESIZE;
+	dev_dbg(&client->dev, "BLDR Pages = %d\n", n_fw_pages);
+
+	for (page = 0; page < n_fw_pages; page++) {
+		error = raydium_i2c_fw_write_page(client,
+					fw->data + page * RAYDIUM_FW_PAGESIZE);
+		if (error) {
+			dev_err(&client->dev,
+				"failed to write FW page %d: %d\n",
+				page, error);
+			return error;
+		}
+	}
+	error = raydium_i2c_send_message(client, 1, (void *)main_cmd);
+	msleep(20);
+	raydium_i2c_sw_reset(client);
+	dev_info(&client->dev, "firmware update completed\n");
+
+	return 0;
+}
+
+static int raydium_i2c_fw_update(struct raydium_data *ts)
+{
+	struct i2c_client *client = ts->client;
+	const struct firmware *fw;
+	char *fw_name;
+	int error;
+
+	fw_name = kasprintf(GFP_KERNEL, "raydium_i2c_%04x.bin",
+		ts->info.hw_ver & 0xFFFF);
+	if (!fw_name)
+		return -ENOMEM;
+
+	dev_info(&client->dev, "requesting fw name = %s\n", fw_name);
+	error = request_firmware(&fw, fw_name, &client->dev);
+	kfree(fw_name);
+	if (error) {
+		dev_err(&client->dev, "failed to request firmware: %d\n",
+			error);
+		return error;
+	}
+
+	if (fw->size % RAYDIUM_FW_PAGESIZE) {
+		dev_err(&client->dev, "invalid firmware length: %zu\n",
+			fw->size);
+		error = -EINVAL;
+		goto out;
+	}
+
+	disable_irq(client->irq);
+	error = raydium_i2c_do_update_firmware(client, fw,
+					ts->boot_mode == RAYDIUM_TS_BLDR);
+	if (error) {
+		dev_err(&client->dev, "firmware update failed: %d\n", error);
+		ts->boot_mode = RAYDIUM_TS_BLDR;
+		goto out_enable_irq;
+	}
+	error = raydium_i2c_initialize(ts);
+	if (error) {
+		dev_err(&client->dev,
+			"failed to initialize device after firmware update: %d\n",
+			error);
+		ts->boot_mode = RAYDIUM_TS_BLDR;
+		goto out_enable_irq;
+	}
+
+	ts->boot_mode = RAYDIUM_TS_MAIN;
+
+out_enable_irq:
+	enable_irq(client->irq);
+	msleep(100);
+out:
+	release_firmware(fw);
+	return error;
+}
+
+static void raydium_mt_event(struct raydium_data *ts)
+{
+	u8 data[MAX_PACKET_SIZE];
+	int error, i;
+	int x, y, f_state, pressure, wx, wy;
+
+	error = raydium_i2c_read_message(ts->client, ts->obj.data_bank_addr,
+		ts->obj.pkg_size, (void *)data);
+
+	if (error < 0) {
+		dev_err(&ts->client->dev, "%s: failed to read data: %d\n",
+			__func__, error);
+		return;
+	}
+
+	for (i = 0; i < MAX_TOUCH_NUM; i++) {
+		f_state = (data + i * ts->obj.tp_info_size)[POS_STATE];
+		pressure = (data + i * ts->obj.tp_info_size)[POS_PRESSURE];
+		wx = (data + i * ts->obj.tp_info_size)[WIDTH_X];
+		wy = (data + i * ts->obj.tp_info_size)[WIDTH_Y];
+
+		input_mt_slot(ts->input, i);
+		input_mt_report_slot_state(ts->input,
+				MT_TOOL_FINGER, f_state != 0);
+
+		if (!f_state)
+			continue;
+		x = get_unaligned_le16(&data[i * ts->obj.tp_info_size + POS_X]);
+		y = get_unaligned_le16(&data[i * ts->obj.tp_info_size + POS_Y]);
+
+		input_report_abs(ts->input, ABS_MT_POSITION_X, x);
+		input_report_abs(ts->input, ABS_MT_POSITION_Y, y);
+		input_report_abs(ts->input, ABS_MT_PRESSURE, pressure);
+		input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
+			max(wx, wy));
+		input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
+			min(wx, wy));
+	}
+
+	input_mt_sync_frame(ts->input);
+	input_sync(ts->input);
+}
+
+static irqreturn_t raydium_i2c_irq(int irq, void *_dev)
+{
+	struct raydium_data *ts = _dev;
+
+	if (ts->boot_mode != RAYDIUM_TS_BLDR)
+		raydium_mt_event(ts);
+
+	return IRQ_HANDLED;
+}
+
+static ssize_t write_update_fw(struct device *dev,
+			struct device_attribute *attr,
+			const char *buf, size_t count)
+{
+	struct raydium_data *ts = dev_get_drvdata(dev);
+	int error;
+
+	error = mutex_lock_interruptible(&ts->sysfs_mutex);
+	if (error)
+		return error;
+
+	error = raydium_i2c_fw_update(ts);
+	dev_dbg(dev, "firmware update result: %d\n", error);
+
+	mutex_unlock(&ts->sysfs_mutex);
+	return error ?: count;
+}
+
+static ssize_t raydium_bootmode_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct raydium_data *ts = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%s\n", ts->boot_mode == RAYDIUM_TS_MAIN ?
+		"Normal" : "Recovery");
+}
+
+static ssize_t raydium_fw_ver_show(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	struct raydium_data *ts = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d.%d\n", ts->info.main_ver, ts->info.sub_ver);
+}
+
+static ssize_t raydium_hw_ver_show(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	struct raydium_data *ts = dev_get_drvdata(dev);
+
+	return sprintf(buf, "0x%04x\n", ts->info.hw_ver);
+}
+
+static DEVICE_ATTR(fw_version, S_IRUGO, raydium_fw_ver_show, NULL);
+static DEVICE_ATTR(hw_version, S_IRUGO, raydium_hw_ver_show, NULL);
+static DEVICE_ATTR(boot_mode, S_IRUGO, raydium_bootmode_show, NULL);
+static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw);
+
+static struct attribute *raydium_attributes[] = {
+	&dev_attr_update_fw.attr,
+	&dev_attr_boot_mode.attr,
+	&dev_attr_fw_version.attr,
+	&dev_attr_hw_version.attr,
+	NULL
+};
+
+static struct attribute_group raydium_attribute_group = {
+	.attrs = raydium_attributes,
+};
+
+static void raydium_i2c_remove_sysfs_group(void *_data)
+{
+	struct raydium_data *ts = _data;
+
+	sysfs_remove_group(&ts->client->dev.kobj, &raydium_attribute_group);
+}
+
+static int raydium_i2c_power_on(struct raydium_data *ts)
+{
+	int error;
+
+	if (IS_ERR_OR_NULL(ts->reset_gpio))
+		return 0;
+
+	gpiod_set_value_cansleep(ts->reset_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->vccio);
+	if (error) {
+		regulator_disable(ts->avdd);
+		dev_err(&ts->client->dev,
+			"failed to enable vccio regulator: %d\n", error);
+		goto release_reset_gpio;
+	}
+
+	udelay(RAYDIUM_POWERON_DELAY_USEC);
+
+release_reset_gpio:
+	gpiod_set_value_cansleep(ts->reset_gpio, 0);
+
+	if (error)
+		return error;
+
+	msleep(RAYDIUM_RESET_DELAY_MSEC);
+
+	return 0;
+}
+
+static void raydium_i2c_power_off(void *_data)
+{
+	struct raydium_data *ts = _data;
+
+	if (!IS_ERR_OR_NULL(ts->reset_gpio)) {
+		gpiod_set_value_cansleep(ts->reset_gpio, 1);
+		regulator_disable(ts->vccio);
+		regulator_disable(ts->avdd);
+	}
+}
+
+static int raydium_i2c_probe(struct i2c_client *client,
+			    const struct i2c_device_id *id)
+{
+	union i2c_smbus_data dummy;
+	struct raydium_data *ts;
+	unsigned long irqflags;
+	int error;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(&client->dev,
+			"%s: i2c check functionality error\n", DEVICE_NAME);
+		return -ENXIO;
+	}
+
+	ts = devm_kzalloc(&client->dev, sizeof(struct raydium_data),
+		GFP_KERNEL);
+	if (!ts)
+		return -ENOMEM;
+
+	mutex_init(&ts->sysfs_mutex);
+	init_completion(&ts->cmd_done);
+
+	ts->client = client;
+	i2c_set_clientdata(client, ts);
+
+	ts->avdd = devm_regulator_get(&client->dev, "avdd");
+	if (IS_ERR(ts->avdd)) {
+		error = PTR_ERR(ts->avdd);
+		if (error != -EPROBE_DEFER)
+			dev_err(&client->dev,
+				"Failed to get 'avdd' regulator: %d\n", error);
+		return error;
+	}
+
+	ts->vccio = devm_regulator_get(&client->dev, "vccio");
+	if (IS_ERR(ts->vccio)) {
+		error = PTR_ERR(ts->vccio);
+		if (error != -EPROBE_DEFER)
+			dev_err(&client->dev,
+				"Failed to get 'vccio' regulator: %d\n", error);
+		return error;
+	}
+
+	ts->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
+		GPIOD_OUT_LOW);
+	if (IS_ERR(ts->reset_gpio)) {
+		error = PTR_ERR(ts->reset_gpio);
+		if (error != -EPROBE_DEFER) {
+			dev_err(&client->dev,
+				"failed to get reset gpio: %d\n", error);
+			return error;
+		}
+	}
+
+	error = raydium_i2c_power_on(ts);
+	if (error)
+		return error;
+
+	error = devm_add_action(&client->dev, raydium_i2c_power_off, ts);
+	if (error) {
+		dev_err(&client->dev,
+			"failed to install power off action: %d\n", error);
+		raydium_i2c_power_off(ts);
+		return error;
+	}
+
+	/* 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) {
+		dev_err(&client->dev, "nothing at this address\n");
+		return -ENXIO;
+	}
+
+	error = raydium_i2c_initialize(ts);
+	if (error) {
+		dev_err(&client->dev, "failed to initialize: %d\n", error);
+		return error;
+	}
+
+	ts->input = devm_input_allocate_device(&client->dev);
+	if (!ts->input) {
+		dev_err(&client->dev, "Failed to allocate input device\n");
+		return -ENOMEM;
+	}
+
+	ts->input->name = "Raydium Touchscreen";
+	ts->input->id.bustype = BUS_I2C;
+
+	__set_bit(BTN_TOUCH, ts->input->keybit);
+	__set_bit(EV_ABS, ts->input->evbit);
+	__set_bit(EV_KEY, ts->input->evbit);
+
+	/* Multitouch input params setup */
+	input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0,
+		ts->info.x_max, 0, 0);
+	input_set_abs_params(ts->input, ABS_MT_POSITION_Y,
+		0, ts->info.y_max, 0, 0);
+	input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
+	input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
+	input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->info.x_res);
+	input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->info.y_res);
+
+	input_mt_init_slots(ts->input, MAX_TOUCH_NUM, 0);
+
+	input_set_drvdata(ts->input, ts);
+
+	error = input_mt_init_slots(ts->input, MAX_TOUCH_NUM,
+		INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+	if (error) {
+		dev_err(&client->dev,
+			"failed to initialize MT slots: %d\n", error);
+		return error;
+	}
+
+	error = input_register_device(ts->input);
+	if (error) {
+		dev_err(&client->dev,
+			"unable to register input device: %d\n", error);
+		return error;
+	}
+
+	error = devm_request_threaded_irq(&client->dev, client->irq,
+			NULL, raydium_i2c_irq, irqflags | IRQF_ONESHOT,
+			client->name, ts);
+	if (error) {
+		dev_err(&client->dev, "Failed to register interrupt\n");
+		return error;
+	}
+
+	device_init_wakeup(&client->dev, true);
+
+	error = sysfs_create_group(&client->dev.kobj, &raydium_attribute_group);
+	if (error) {
+		dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
+			error);
+		return error;
+	}
+
+	error = devm_add_action(&client->dev,
+				raydium_i2c_remove_sysfs_group, ts);
+	if (error) {
+		raydium_i2c_remove_sysfs_group(ts);
+		dev_err(&client->dev,
+			"Failed to add sysfs cleanup action: %d\n", error);
+		return error;
+	}
+
+	return 0;
+}
+
+static int raydium_i2c_remove(struct i2c_client *client)
+{
+	struct raydium_data *ts = i2c_get_clientdata(client);
+
+	input_unregister_device(ts->input);
+
+	device_init_wakeup(&client->dev, false);
+
+	mutex_destroy(&ts->sysfs_mutex);
+
+	return 0;
+}
+
+static void __maybe_unused raydium_enter_sleep(struct i2c_client *client)
+{
+	static const u8 sleep_cmd[] = { 0x5A, 0xff, 0x00, 0x0f };
+	int error;
+
+	error = raydium_i2c_send(client, CMD_ENTER_SLEEP, (u8 *)sleep_cmd,
+		sizeof(sleep_cmd));
+	if (error)
+		dev_err(&client->dev,
+			"Send sleep failed: %d\n", error);
+}
+
+static int __maybe_unused raydium_i2c_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct raydium_data *ts = i2c_get_clientdata(client);
+
+	/* Command not support in BLDR recovery mode */
+	if (ts->boot_mode != RAYDIUM_TS_MAIN)
+		return -EBUSY;
+
+	disable_irq(client->irq);
+
+	if (device_may_wakeup(dev)) {
+		raydium_enter_sleep(client);
+
+		ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0);
+	} else {
+		raydium_i2c_power_off(ts);
+	}
+
+	return 0;
+}
+
+static int __maybe_unused raydium_i2c_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct raydium_data *ts = i2c_get_clientdata(client);
+
+	if (device_may_wakeup(dev)) {
+		if (ts->wake_irq_enabled)
+			disable_irq_wake(client->irq);
+		raydium_i2c_sw_reset(client);
+	} else {
+		raydium_i2c_power_on(ts);
+		raydium_i2c_initialize(ts);
+	}
+
+	enable_irq(client->irq);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(raydium_i2c_pm_ops,
+			 raydium_i2c_suspend, raydium_i2c_resume);
+
+static const struct i2c_device_id raydium_i2c_id[] = {
+	{ DEVICE_NAME, 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, raydium_i2c_id);
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id raydium_acpi_id[] = {
+	{ "RAYD0001", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, raydium_acpi_id);
+#endif
+
+#ifdef CONFIG_OF
+static const struct of_device_id raydium_of_match[] = {
+	{ .compatible = "raydium,rm31100",},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, raydium_of_match);
+#endif
+
+static struct i2c_driver raydium_i2c_driver = {
+	.probe = raydium_i2c_probe,
+	.remove = raydium_i2c_remove,
+	.id_table = raydium_i2c_id,
+	.driver = {
+		.name = "raydium_ts",
+		.pm = &raydium_i2c_pm_ops,
+		.acpi_match_table = ACPI_PTR(raydium_acpi_id),
+		.of_match_table = of_match_ptr(raydium_of_match),
+	},
+};
+
+module_i2c_driver(raydium_i2c_driver);
+
+MODULE_AUTHOR("Raydium");
+MODULE_DESCRIPTION("Raydium I2c Touchscreen driver");
+MODULE_LICENSE("GPL v2");
-- 
2.1.2