input: synaptics_dsx: Add support for synaptics_dsx touch

Change-Id: I1df8a7465fdb5c18cf69e0908347fc78ce7dd07c
Git-commit: 67b7a9d78725d5de2a1899095eb0026e15343a62
Git-repo: git://github.com/synaptics-touch/synaptics-dsx-v2.1
Signed-off-by: Alexandra Chin <alexandra.chin@tw.synaptics.com>
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>

drivers/input/touchscreen/synaptics_dsx/Kconfig

@@ -0,0 +1,70 @@
+#
+# Synaptics DSX touchscreen driver configuration
+#
+menuconfig TOUCHSCREEN_SYNAPTICS_DSX
+	bool "Synaptics DSX touchscreen"
+	default y
+	help
+	  Say Y here if you have a Synaptics DSX touchscreen connected
+	  to your system.
+
+	  If unsure, say N.
+
+if TOUCHSCREEN_SYNAPTICS_DSX
+
+choice
+	default TOUCHSCREEN_SYNAPTICS_DSX_I2C
+	prompt "Synaptics DSX touchscreen bus interface"
+config TOUCHSCREEN_SYNAPTICS_DSX_I2C
+	bool "I2C"
+	depends on I2C
+config TOUCHSCREEN_SYNAPTICS_DSX_SPI
+	bool "SPI"
+	depends on SPI_MASTER
+endchoice
+
+config TOUCHSCREEN_SYNAPTICS_DSX_CORE
+	tristate "Synaptics DSX core driver module"
+	depends on TOUCHSCREEN_SYNAPTICS_DSX_I2C || TOUCHSCREEN_SYNAPTICS_DSX_SPI
+	help
+	  Say Y here to enable basic touch reporting functionalities.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called synaptics_dsx_core.
+
+config TOUCHSCREEN_SYNAPTICS_DSX_RMI_DEV
+	tristate "Synaptics DSX touchscreen RMI device module"
+	depends on TOUCHSCREEN_SYNAPTICS_DSX_CORE
+	help
+	  Say Y here to enable support for direct RMI register access.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called synaptics_dsx_rmi_dev.
+
+config TOUCHSCREEN_SYNAPTICS_DSX_FW_UPDATE
+	tristate "Synaptics DSX touchscreen firmware update module"
+	depends on TOUCHSCREEN_SYNAPTICS_DSX_CORE
+	help
+	  Say Y here to enable support for carrying out firmware update.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called synaptics_dsx_fw_update.
+
+config TOUCHSCREEN_SYNAPTICS_DSX_PROXIMITY
+	tristate "Synaptics DSX touchscreen proximity module"
+	depends on TOUCHSCREEN_SYNAPTICS_DSX_CORE
+	help
+	  Say Y here to enable support for proximity functionalities.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called synaptics_dsx_proximity.
+
+endif

drivers/input/touchscreen/synaptics_dsx/Makefile

@@ -0,0 +1,12 @@
+#
+# Makefile for the Synaptics DSX touchscreen driver.
+#
+
+# Each configuration option enables a list of files.
+
+obj-$(CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_I2C) += synaptics_dsx_i2c.o
+obj-$(CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_SPI) += synaptics_dsx_spi.o
+obj-$(CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_CORE) += synaptics_dsx_core.o
+obj-$(CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_RMI_DEV) += synaptics_dsx_rmi_dev.o
+obj-$(CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_FW_UPDATE) += synaptics_dsx_fw_update.o
+obj-$(CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_PROXIMITY) += synaptics_dsx_proximity.o

drivers/input/touchscreen/synaptics_dsx/synaptics_dsx_core.h

@@ -0,0 +1,336 @@
+/*
+ * Synaptics DSX touchscreen driver
+ *
+ * Copyright (C) 2012 Synaptics Incorporated
+ *
+ * Copyright (C) 2012 Alexandra Chin <alexandra.chin@tw.synaptics.com>
+ * Copyright (C) 2012 Scott Lin <scott.lin@tw.synaptics.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+#ifndef _SYNAPTICS_DSX_RMI4_H_
+#define _SYNAPTICS_DSX_RMI4_H_
+
+#define SYNAPTICS_DS4 (1 << 0)
+#define SYNAPTICS_DS5 (1 << 1)
+#define SYNAPTICS_DSX_DRIVER_PRODUCT (SYNAPTICS_DS4 | SYNAPTICS_DS5)
+#define SYNAPTICS_DSX_DRIVER_VERSION 0x2001
+
+#include <linux/version.h>
+#ifdef CONFIG_HAS_EARLYSUSPEND
+#include <linux/earlysuspend.h>
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 38))
+#define KERNEL_ABOVE_2_6_38
+#endif
+
+#ifdef KERNEL_ABOVE_2_6_38
+#define sstrtoul(...) kstrtoul(__VA_ARGS__)
+#else
+#define sstrtoul(...) strict_strtoul(__VA_ARGS__)
+#endif
+
+#define PDT_PROPS (0X00EF)
+#define PDT_START (0x00E9)
+#define PDT_END (0x00D0)
+#define PDT_ENTRY_SIZE (0x0006)
+#define PAGES_TO_SERVICE (10)
+#define PAGE_SELECT_LEN (2)
+#define ADDRESS_WORD_LEN (2)
+
+#define SYNAPTICS_RMI4_F01 (0x01)
+#define SYNAPTICS_RMI4_F11 (0x11)
+#define SYNAPTICS_RMI4_F12 (0x12)
+#define SYNAPTICS_RMI4_F1A (0x1a)
+#define SYNAPTICS_RMI4_F34 (0x34)
+#define SYNAPTICS_RMI4_F51 (0x51)
+#define SYNAPTICS_RMI4_F54 (0x54)
+#define SYNAPTICS_RMI4_F55 (0x55)
+
+#define SYNAPTICS_RMI4_PRODUCT_INFO_SIZE 2
+#define SYNAPTICS_RMI4_DATE_CODE_SIZE 3
+#define SYNAPTICS_RMI4_PRODUCT_ID_SIZE 10
+#define SYNAPTICS_RMI4_BUILD_ID_SIZE 3
+
+#define F12_FINGERS_TO_SUPPORT 10
+#define F12_NO_OBJECT_STATUS 0x00
+#define F12_FINGER_STATUS 0x01
+#define F12_STYLUS_STATUS 0x02
+#define F12_PALM_STATUS 0x03
+#define F12_HOVERING_FINGER_STATUS 0x05
+#define F12_GLOVED_FINGER_STATUS 0x06
+
+#define MAX_NUMBER_OF_BUTTONS 4
+#define MAX_INTR_REGISTERS 4
+
+#define MASK_16BIT 0xFFFF
+#define MASK_8BIT 0xFF
+#define MASK_7BIT 0x7F
+#define MASK_6BIT 0x3F
+#define MASK_5BIT 0x1F
+#define MASK_4BIT 0x0F
+#define MASK_3BIT 0x07
+#define MASK_2BIT 0x03
+#define MASK_1BIT 0x01
+
+enum exp_fn {
+	RMI_DEV = 0,
+	RMI_F54,
+	RMI_FW_UPDATER,
+	RMI_PROXIMITY,
+	RMI_ACTIVE_PEN,
+	RMI_LAST,
+};
+
+struct synaptics_dsx_hw_interface {
+	const struct synaptics_dsx_board_data *board_data;
+	const struct synaptics_dsx_bus_access *bus_access;
+};
+
+/*
+ * struct synaptics_rmi4_fn_desc - function descriptor fields in PDT
+ * @query_base_addr: base address for query registers
+ * @cmd_base_addr: base address for command registers
+ * @ctrl_base_addr: base address for control registers
+ * @data_base_addr: base address for data registers
+ * @intr_src_count: number of interrupt sources
+ * @fn_number: function number
+ */
+struct synaptics_rmi4_fn_desc {
+	unsigned char query_base_addr;
+	unsigned char cmd_base_addr;
+	unsigned char ctrl_base_addr;
+	unsigned char data_base_addr;
+	unsigned char intr_src_count;
+	unsigned char fn_number;
+};
+
+/*
+ * synaptics_rmi4_fn_full_addr - full 16-bit base addresses
+ * @query_base: 16-bit base address for query registers
+ * @cmd_base: 16-bit base address for data registers
+ * @ctrl_base: 16-bit base address for command registers
+ * @data_base: 16-bit base address for control registers
+ */
+struct synaptics_rmi4_fn_full_addr {
+	unsigned short query_base;
+	unsigned short cmd_base;
+	unsigned short ctrl_base;
+	unsigned short data_base;
+};
+
+struct synaptics_rmi4_f12_extra_data {
+	unsigned char data1_offset;
+	unsigned char data15_offset;
+	unsigned char data15_size;
+	unsigned char data15_data[(F12_FINGERS_TO_SUPPORT + 7) / 8];
+};
+
+/*
+ * struct synaptics_rmi4_fn - function handler data structure
+ * @fn_number: function number
+ * @num_of_data_sources: number of data sources
+ * @num_of_data_points: maximum number of fingers supported
+ * @size_of_data_register_block: data register block size
+ * @intr_reg_num: index to associated interrupt register
+ * @intr_mask: interrupt mask
+ * @full_addr: full 16-bit base addresses of function registers
+ * @link: linked list for function handlers
+ * @data_size: size of private data
+ * @data: pointer to private data
+ */
+struct synaptics_rmi4_fn {
+	unsigned char fn_number;
+	unsigned char num_of_data_sources;
+	unsigned char num_of_data_points;
+	unsigned char size_of_data_register_block;
+	unsigned char intr_reg_num;
+	unsigned char intr_mask;
+	struct synaptics_rmi4_fn_full_addr full_addr;
+	struct list_head link;
+	int data_size;
+	void *data;
+	void *extra;
+};
+
+/*
+ * struct synaptics_rmi4_device_info - device information
+ * @version_major: rmi protocol major version number
+ * @version_minor: rmi protocol minor version number
+ * @manufacturer_id: manufacturer id
+ * @product_props: product properties information
+ * @product_info: product info array
+ * @date_code: device manufacture date
+ * @tester_id: tester id array
+ * @serial_number: device serial number
+ * @product_id_string: device product id
+ * @support_fn_list: linked list for function handlers
+ */
+struct synaptics_rmi4_device_info {
+	unsigned int version_major;
+	unsigned int version_minor;
+	unsigned char manufacturer_id;
+	unsigned char product_props;
+	unsigned char product_info[SYNAPTICS_RMI4_PRODUCT_INFO_SIZE];
+	unsigned char date_code[SYNAPTICS_RMI4_DATE_CODE_SIZE];
+	unsigned short tester_id;
+	unsigned short serial_number;
+	unsigned char product_id_string[SYNAPTICS_RMI4_PRODUCT_ID_SIZE + 1];
+	unsigned char build_id[SYNAPTICS_RMI4_BUILD_ID_SIZE];
+	struct list_head support_fn_list;
+};
+
+/*
+ * struct synaptics_rmi4_data - rmi4 device instance data
+ * @pdev: pointer to platform device
+ * @input_dev: pointer to associated input device
+ * @hw_if: pointer to hardware interface data
+ * @rmi4_mod_info: device information
+ * @regulator: pointer to associated regulator
+ * @rmi4_io_ctrl_mutex: mutex for i2c i/o control
+ * @early_suspend: instance to support early suspend power management
+ * @current_page: current page in sensor to acess
+ * @button_0d_enabled: flag for 0d button support
+ * @full_pm_cycle: flag for full power management cycle in early suspend stage
+ * @num_of_intr_regs: number of interrupt registers
+ * @f01_query_base_addr: query base address for f01
+ * @f01_cmd_base_addr: command base address for f01
+ * @f01_ctrl_base_addr: control base address for f01
+ * @f01_data_base_addr: data base address for f01
+ * @irq: attention interrupt
+ * @sensor_max_x: sensor maximum x value
+ * @sensor_max_y: sensor maximum y value
+ * @irq_enabled: flag for indicating interrupt enable status
+ * @fingers_on_2d: flag to indicate presence of fingers in 2d area
+ * @sensor_sleep: flag to indicate sleep state of sensor
+ * @wait: wait queue for touch data polling in interrupt thread
+ * @irq_enable: pointer to irq enable function
+ */
+struct synaptics_rmi4_data {
+	struct platform_device *pdev;
+	struct input_dev *input_dev;
+	const struct synaptics_dsx_hw_interface *hw_if;
+	struct synaptics_rmi4_device_info rmi4_mod_info;
+	struct regulator *regulator;
+	struct mutex rmi4_reset_mutex;
+	struct mutex rmi4_io_ctrl_mutex;
+#ifdef CONFIG_HAS_EARLYSUSPEND
+	struct early_suspend early_suspend;
+#endif
+	unsigned char current_page;
+	unsigned char button_0d_enabled;
+	unsigned char full_pm_cycle;
+	unsigned char num_of_rx;
+	unsigned char num_of_tx;
+	unsigned char num_of_fingers;
+	unsigned char max_touch_width;
+	unsigned char report_enable;
+	unsigned char no_sleep_setting;
+	unsigned char intr_mask[MAX_INTR_REGISTERS];
+	unsigned char *button_txrx_mapping;
+	unsigned short num_of_intr_regs;
+	unsigned short f01_query_base_addr;
+	unsigned short f01_cmd_base_addr;
+	unsigned short f01_ctrl_base_addr;
+	unsigned short f01_data_base_addr;
+	unsigned int firmware_id;
+	int irq;
+	int sensor_max_x;
+	int sensor_max_y;
+	bool flash_prog_mode;
+	bool irq_enabled;
+	bool touch_stopped;
+	bool fingers_on_2d;
+	bool sensor_sleep;
+	bool stay_awake;
+	bool staying_awake;
+	int (*irq_enable)(struct synaptics_rmi4_data *rmi4_data, bool enable);
+	int (*reset_device)(struct synaptics_rmi4_data *rmi4_data);
+};
+
+struct synaptics_dsx_bus_access {
+	unsigned char type;
+	int (*read)(struct synaptics_rmi4_data *rmi4_data, unsigned short addr,
+		unsigned char *data, unsigned short length);
+	int (*write)(struct synaptics_rmi4_data *rmi4_data, unsigned short addr,
+		unsigned char *data, unsigned short length);
+};
+
+struct synaptics_rmi4_exp_fn {
+	enum exp_fn fn_type;
+	int (*init)(struct synaptics_rmi4_data *rmi4_data);
+	void (*remove)(struct synaptics_rmi4_data *rmi4_data);
+	void (*reset)(struct synaptics_rmi4_data *rmi4_data);
+	void (*reinit)(struct synaptics_rmi4_data *rmi4_data);
+	void (*early_suspend)(struct synaptics_rmi4_data *rmi4_data);
+	void (*suspend)(struct synaptics_rmi4_data *rmi4_data);
+	void (*resume)(struct synaptics_rmi4_data *rmi4_data);
+	void (*late_resume)(struct synaptics_rmi4_data *rmi4_data);
+	void (*attn)(struct synaptics_rmi4_data *rmi4_data,
+			unsigned char intr_mask);
+};
+
+int synaptics_rmi4_bus_init(void);
+
+void synaptics_rmi4_bus_exit(void);
+
+void synaptics_rmi4_new_function(struct synaptics_rmi4_exp_fn *exp_fn_module,
+		bool insert);
+
+int synaptics_fw_updater(unsigned char *fw_data);
+
+static inline int synaptics_rmi4_reg_read(
+		struct synaptics_rmi4_data *rmi4_data,
+		unsigned short addr,
+		unsigned char *data,
+		unsigned short len)
+{
+	return rmi4_data->hw_if->bus_access->read(rmi4_data, addr, data, len);
+}
+
+static inline int synaptics_rmi4_reg_write(
+		struct synaptics_rmi4_data *rmi4_data,
+		unsigned short addr,
+		unsigned char *data,
+		unsigned short len)
+{
+	return rmi4_data->hw_if->bus_access->write(rmi4_data, addr, data, len);
+}
+
+static inline ssize_t synaptics_rmi4_show_error(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	dev_warn(dev, "%s Attempted to read from write-only attribute %s\n",
+			__func__, attr->attr.name);
+	return -EPERM;
+}
+
+static inline ssize_t synaptics_rmi4_store_error(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	dev_warn(dev, "%s Attempted to write to read-only attribute %s\n",
+			__func__, attr->attr.name);
+	return -EPERM;
+}
+
+static inline void batohs(unsigned short *dest, unsigned char *src)
+{
+	*dest = src[1] * 0x100 + src[0];
+}
+
+static inline void hstoba(unsigned char *dest, unsigned short src)
+{
+	dest[0] = src % 0x100;
+	dest[1] = src / 0x100;
+}
+
+#endif

drivers/input/touchscreen/synaptics_dsx/synaptics_dsx_i2c.c

@@ -0,0 +1,271 @@
+/*
+ * Synaptics DSX touchscreen driver
+ *
+ * Copyright (C) 2012 Synaptics Incorporated
+ *
+ * Copyright (C) 2012 Alexandra Chin <alexandra.chin@tw.synaptics.com>
+ * Copyright (C) 2012 Scott Lin <scott.lin@tw.synaptics.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/types.h>
+#include <linux/platform_device.h>
+#include <linux/input/synaptics_dsx.h>
+#include "synaptics_dsx_core.h"
+
+#define SYN_I2C_RETRY_TIMES 10
+
+static int synaptics_rmi4_i2c_set_page(struct synaptics_rmi4_data *rmi4_data,
+		unsigned short addr)
+{
+	int retval;
+	unsigned char retry;
+	unsigned char buf[PAGE_SELECT_LEN];
+	unsigned char page;
+	struct i2c_client *i2c = to_i2c_client(rmi4_data->pdev->dev.parent);
+
+	page = ((addr >> 8) & MASK_8BIT);
+	if (page != rmi4_data->current_page) {
+		buf[0] = MASK_8BIT;
+		buf[1] = page;
+		for (retry = 0; retry < SYN_I2C_RETRY_TIMES; retry++) {
+			retval = i2c_master_send(i2c, buf, PAGE_SELECT_LEN);
+			if (retval != PAGE_SELECT_LEN) {
+				dev_err(rmi4_data->pdev->dev.parent,
+						"%s: I2C retry %d\n",
+						__func__, retry + 1);
+				msleep(20);
+			} else {
+				rmi4_data->current_page = page;
+				break;
+			}
+		}
+	} else {
+		retval = PAGE_SELECT_LEN;
+	}
+
+	return retval;
+}
+
+static int synaptics_rmi4_i2c_read(struct synaptics_rmi4_data *rmi4_data,
+		unsigned short addr, unsigned char *data, unsigned short length)
+{
+	int retval;
+	unsigned char retry;
+	unsigned char buf;
+	struct i2c_client *i2c = to_i2c_client(rmi4_data->pdev->dev.parent);
+	struct i2c_msg msg[] = {
+		{
+			.addr = i2c->addr,
+			.flags = 0,
+			.len = 1,
+			.buf = &buf,
+		},
+		{
+			.addr = i2c->addr,
+			.flags = I2C_M_RD,
+			.len = length,
+			.buf = data,
+		},
+	};
+
+	buf = addr & MASK_8BIT;
+
+	mutex_lock(&rmi4_data->rmi4_io_ctrl_mutex);
+
+	retval = synaptics_rmi4_i2c_set_page(rmi4_data, addr);
+	if (retval != PAGE_SELECT_LEN) {
+		retval = -EIO;
+		goto exit;
+	}
+
+	for (retry = 0; retry < SYN_I2C_RETRY_TIMES; retry++) {
+		if (i2c_transfer(i2c->adapter, msg, 2) == 2) {
+			retval = length;
+			break;
+		}
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: I2C retry %d\n",
+				__func__, retry + 1);
+		msleep(20);
+	}
+
+	if (retry == SYN_I2C_RETRY_TIMES) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: I2C read over retry limit\n",
+				__func__);
+		retval = -EIO;
+	}
+
+exit:
+	mutex_unlock(&rmi4_data->rmi4_io_ctrl_mutex);
+
+	return retval;
+}
+
+static int synaptics_rmi4_i2c_write(struct synaptics_rmi4_data *rmi4_data,
+		unsigned short addr, unsigned char *data, unsigned short length)
+{
+	int retval;
+	unsigned char retry;
+	unsigned char buf[length + 1];
+	struct i2c_client *i2c = to_i2c_client(rmi4_data->pdev->dev.parent);
+	struct i2c_msg msg[] = {
+		{
+			.addr = i2c->addr,
+			.flags = 0,
+			.len = length + 1,
+			.buf = buf,
+		}
+	};
+
+	mutex_lock(&rmi4_data->rmi4_io_ctrl_mutex);
+
+	retval = synaptics_rmi4_i2c_set_page(rmi4_data, addr);
+	if (retval != PAGE_SELECT_LEN) {
+		retval = -EIO;
+		goto exit;
+	}
+
+	buf[0] = addr & MASK_8BIT;
+	memcpy(&buf[1], &data[0], length);
+
+	for (retry = 0; retry < SYN_I2C_RETRY_TIMES; retry++) {
+		if (i2c_transfer(i2c->adapter, msg, 1) == 1) {
+			retval = length;
+			break;
+		}
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: I2C retry %d\n",
+				__func__, retry + 1);
+		msleep(20);
+	}
+
+	if (retry == SYN_I2C_RETRY_TIMES) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: I2C write over retry limit\n",
+				__func__);
+		retval = -EIO;
+	}
+
+exit:
+	mutex_unlock(&rmi4_data->rmi4_io_ctrl_mutex);
+
+	return retval;
+}
+
+static struct synaptics_dsx_bus_access bus_access = {
+	.type = BUS_I2C,
+	.read = synaptics_rmi4_i2c_read,
+	.write = synaptics_rmi4_i2c_write,
+};
+
+static struct synaptics_dsx_hw_interface hw_if;
+
+static struct platform_device *synaptics_dsx_i2c_device;
+
+static void synaptics_rmi4_i2c_dev_release(struct device *dev)
+{
+	kfree(synaptics_dsx_i2c_device);
+
+	return;
+}
+
+static int synaptics_rmi4_i2c_probe(struct i2c_client *client,
+		const struct i2c_device_id *dev_id)
+{
+	int retval;
+
+	if (!i2c_check_functionality(client->adapter,
+			I2C_FUNC_SMBUS_BYTE_DATA)) {
+		dev_err(&client->dev,
+				"%s: SMBus byte data commands not supported by host\n",
+				__func__);
+		return -EIO;
+	}
+
+	synaptics_dsx_i2c_device = kzalloc(
+			sizeof(struct platform_device),
+			GFP_KERNEL);
+	if (!synaptics_dsx_i2c_device) {
+		dev_err(&client->dev,
+				"%s: Failed to allocate memory for synaptics_dsx_i2c_device\n",
+				__func__);
+		return -ENOMEM;
+	}
+
+	hw_if.board_data = client->dev.platform_data;
+	hw_if.bus_access = &bus_access;
+
+	synaptics_dsx_i2c_device->name = PLATFORM_DRIVER_NAME;
+	synaptics_dsx_i2c_device->id = 0;
+	synaptics_dsx_i2c_device->num_resources = 0;
+	synaptics_dsx_i2c_device->dev.parent = &client->dev;
+	synaptics_dsx_i2c_device->dev.platform_data = &hw_if;
+	synaptics_dsx_i2c_device->dev.release = synaptics_rmi4_i2c_dev_release;
+
+	retval = platform_device_register(synaptics_dsx_i2c_device);
+	if (retval) {
+		dev_err(&client->dev,
+				"%s: Failed to register platform device\n",
+				__func__);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int synaptics_rmi4_i2c_remove(struct i2c_client *client)
+{
+	platform_device_unregister(synaptics_dsx_i2c_device);
+
+	return 0;
+}
+
+static const struct i2c_device_id synaptics_rmi4_id_table[] = {
+	{I2C_DRIVER_NAME, 0},
+	{},
+};
+MODULE_DEVICE_TABLE(i2c, synaptics_rmi4_id_table);
+
+static struct i2c_driver synaptics_rmi4_i2c_driver = {
+	.driver = {
+		.name = I2C_DRIVER_NAME,
+		.owner = THIS_MODULE,
+	},
+	.probe = synaptics_rmi4_i2c_probe,
+	.remove = __devexit_p(synaptics_rmi4_i2c_remove),
+	.id_table = synaptics_rmi4_id_table,
+};
+
+int synaptics_rmi4_bus_init(void)
+{
+	return i2c_add_driver(&synaptics_rmi4_i2c_driver);
+}
+EXPORT_SYMBOL(synaptics_rmi4_bus_init);
+
+void synaptics_rmi4_bus_exit(void)
+{
+	i2c_del_driver(&synaptics_rmi4_i2c_driver);
+
+	return;
+}
+EXPORT_SYMBOL(synaptics_rmi4_bus_exit);
+
+MODULE_AUTHOR("Synaptics, Inc.");
+MODULE_DESCRIPTION("Synaptics DSX I2C Bus Support Module");
+MODULE_LICENSE("GPL v2");

drivers/input/touchscreen/synaptics_dsx/synaptics_dsx_proximity.c

@@ -0,0 +1,671 @@
+/*
+ * Synaptics DSX touchscreen driver
+ *
+ * Copyright (C) 2012 Synaptics Incorporated
+ *
+ * Copyright (C) 2012 Alexandra Chin <alexandra.chin@tw.synaptics.com>
+ * Copyright (C) 2012 Scott Lin <scott.lin@tw.synaptics.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <linux/input/synaptics_dsx.h>
+#include "synaptics_dsx_core.h"
+
+#define PROX_PHYS_NAME "synaptics_dsx/input1"
+
+#define HOVER_Z_MAX (255)
+
+#define HOVERING_FINGER_EN (1 << 4)
+
+static ssize_t synaptics_rmi4_hover_finger_en_show(struct device *dev,
+		struct device_attribute *attr, char *buf);
+
+static ssize_t synaptics_rmi4_hover_finger_en_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count);
+
+static struct device_attribute attrs[] = {
+	__ATTR(hover_finger_en, (S_IRUGO | S_IWUGO),
+			synaptics_rmi4_hover_finger_en_show,
+			synaptics_rmi4_hover_finger_en_store),
+};
+
+struct synaptics_rmi4_f12_query_5 {
+	union {
+		struct {
+			unsigned char size_of_query6;
+			struct {
+				unsigned char ctrl0_is_present:1;
+				unsigned char ctrl1_is_present:1;
+				unsigned char ctrl2_is_present:1;
+				unsigned char ctrl3_is_present:1;
+				unsigned char ctrl4_is_present:1;
+				unsigned char ctrl5_is_present:1;
+				unsigned char ctrl6_is_present:1;
+				unsigned char ctrl7_is_present:1;
+			} __packed;
+			struct {
+				unsigned char ctrl8_is_present:1;
+				unsigned char ctrl9_is_present:1;
+				unsigned char ctrl10_is_present:1;
+				unsigned char ctrl11_is_present:1;
+				unsigned char ctrl12_is_present:1;
+				unsigned char ctrl13_is_present:1;
+				unsigned char ctrl14_is_present:1;
+				unsigned char ctrl15_is_present:1;
+			} __packed;
+			struct {
+				unsigned char ctrl16_is_present:1;
+				unsigned char ctrl17_is_present:1;
+				unsigned char ctrl18_is_present:1;
+				unsigned char ctrl19_is_present:1;
+				unsigned char ctrl20_is_present:1;
+				unsigned char ctrl21_is_present:1;
+				unsigned char ctrl22_is_present:1;
+				unsigned char ctrl23_is_present:1;
+			} __packed;
+		};
+		unsigned char data[4];
+	};
+};
+
+struct synaptics_rmi4_f12_query_8 {
+	union {
+		struct {
+			unsigned char size_of_query9;
+			struct {
+				unsigned char data0_is_present:1;
+				unsigned char data1_is_present:1;
+				unsigned char data2_is_present:1;
+				unsigned char data3_is_present:1;
+				unsigned char data4_is_present:1;
+				unsigned char data5_is_present:1;
+				unsigned char data6_is_present:1;
+				unsigned char data7_is_present:1;
+			} __packed;
+		};
+		unsigned char data[2];
+	};
+};
+
+struct prox_finger_data {
+	union {
+		struct {
+			unsigned char object_type_and_status;
+			unsigned char x_lsb;
+			unsigned char x_msb;
+			unsigned char y_lsb;
+			unsigned char y_msb;
+			unsigned char z;
+		} __packed;
+		unsigned char proximity_data[6];
+	};
+};
+
+struct synaptics_rmi4_prox_handle {
+	bool hover_finger_present;
+	bool hover_finger_en;
+	unsigned char intr_mask;
+	unsigned short query_base_addr;
+	unsigned short control_base_addr;
+	unsigned short data_base_addr;
+	unsigned short command_base_addr;
+	unsigned short hover_finger_en_addr;
+	unsigned short hover_finger_data_addr;
+	struct input_dev *prox_dev;
+	struct prox_finger_data *finger_data;
+	struct synaptics_rmi4_data *rmi4_data;
+};
+
+static struct synaptics_rmi4_prox_handle *prox;
+
+DECLARE_COMPLETION(prox_remove_complete);
+
+static void prox_hover_finger_lift(void)
+{
+	input_report_key(prox->prox_dev, BTN_TOUCH, 0);
+	input_report_key(prox->prox_dev, BTN_TOOL_FINGER, 0);
+	input_sync(prox->prox_dev);
+	prox->hover_finger_present = false;
+
+	return;
+}
+
+static void prox_hover_finger_report(void)
+{
+	int retval;
+	int x;
+	int y;
+	int z;
+	struct prox_finger_data *data;
+	struct synaptics_rmi4_data *rmi4_data = prox->rmi4_data;
+
+	data = prox->finger_data;
+
+	retval = synaptics_rmi4_reg_read(rmi4_data,
+			prox->hover_finger_data_addr,
+			data->proximity_data,
+			sizeof(data->proximity_data));
+	if (retval < 0) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to read hovering finger data\n",
+				__func__);
+		return;
+	}
+
+	if (data->object_type_and_status != F12_HOVERING_FINGER_STATUS) {
+		if (prox->hover_finger_present)
+			prox_hover_finger_lift();
+
+		return;
+	}
+
+	x = (data->x_msb << 8) | (data->x_lsb);
+	y = (data->y_msb << 8) | (data->y_lsb);
+	z = HOVER_Z_MAX - data->z;
+
+	input_report_key(prox->prox_dev, BTN_TOUCH, 0);
+	input_report_key(prox->prox_dev, BTN_TOOL_FINGER, 1);
+	input_report_abs(prox->prox_dev, ABS_X, x);
+	input_report_abs(prox->prox_dev, ABS_Y, y);
+	input_report_abs(prox->prox_dev, ABS_DISTANCE, z);
+
+	input_sync(prox->prox_dev);
+
+	dev_dbg(rmi4_data->pdev->dev.parent,
+			"%s: x = %d y = %d z = %d\n",
+			__func__, x, y, z);
+
+	prox->hover_finger_present = true;
+
+	return;
+}
+
+static int prox_set_hover_finger_en(void)
+{
+	int retval;
+	unsigned char object_report_enable;
+	struct synaptics_rmi4_data *rmi4_data = prox->rmi4_data;
+
+	retval = synaptics_rmi4_reg_read(rmi4_data,
+			prox->hover_finger_en_addr,
+			&object_report_enable,
+			sizeof(object_report_enable));
+	if (retval < 0) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to read from object report enable register\n",
+				__func__);
+		return retval;
+	}
+
+	if (prox->hover_finger_en)
+		object_report_enable |= HOVERING_FINGER_EN;
+	else
+		object_report_enable &= ~HOVERING_FINGER_EN;
+
+	retval = synaptics_rmi4_reg_write(rmi4_data,
+			prox->hover_finger_en_addr,
+			&object_report_enable,
+			sizeof(object_report_enable));
+	if (retval < 0) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to write to object report enable register\n",
+				__func__);
+		return retval;
+	}
+
+	return 0;
+}
+
+static void prox_set_params(void)
+{
+	input_set_abs_params(prox->prox_dev, ABS_X, 0,
+			prox->rmi4_data->sensor_max_x, 0, 0);
+	input_set_abs_params(prox->prox_dev, ABS_Y, 0,
+			prox->rmi4_data->sensor_max_y, 0, 0);
+	input_set_abs_params(prox->prox_dev, ABS_DISTANCE, 0,
+			HOVER_Z_MAX, 0, 0);
+
+	return;
+}
+
+static int prox_reg_init(void)
+{
+	int retval;
+	unsigned char ctrl_23_offset;
+	unsigned char data_1_offset;
+	struct synaptics_rmi4_f12_query_5 query_5;
+	struct synaptics_rmi4_f12_query_8 query_8;
+	struct synaptics_rmi4_data *rmi4_data = prox->rmi4_data;
+
+	retval = synaptics_rmi4_reg_read(rmi4_data,
+			prox->query_base_addr + 5,
+			query_5.data,
+			sizeof(query_5.data));
+	if (retval < 0)
+		return retval;
+
+	ctrl_23_offset = query_5.ctrl0_is_present +
+			query_5.ctrl1_is_present +
+			query_5.ctrl2_is_present +
+			query_5.ctrl3_is_present +
+			query_5.ctrl4_is_present +
+			query_5.ctrl5_is_present +
+			query_5.ctrl6_is_present +
+			query_5.ctrl7_is_present +
+			query_5.ctrl8_is_present +
+			query_5.ctrl9_is_present +
+			query_5.ctrl10_is_present +
+			query_5.ctrl11_is_present +
+			query_5.ctrl12_is_present +
+			query_5.ctrl13_is_present +
+			query_5.ctrl14_is_present +
+			query_5.ctrl15_is_present +
+			query_5.ctrl16_is_present +
+			query_5.ctrl17_is_present +
+			query_5.ctrl18_is_present +
+			query_5.ctrl19_is_present +
+			query_5.ctrl20_is_present +
+			query_5.ctrl21_is_present +
+			query_5.ctrl22_is_present;
+
+	prox->hover_finger_en_addr = prox->control_base_addr + ctrl_23_offset;
+
+	retval = synaptics_rmi4_reg_read(rmi4_data,
+			prox->query_base_addr + 8,
+			query_8.data,
+			sizeof(query_8.data));
+	if (retval < 0)
+		return retval;
+
+	data_1_offset = query_8.data0_is_present;
+	prox->hover_finger_data_addr = prox->data_base_addr + data_1_offset;
+
+	return retval;
+}
+
+static int prox_scan_pdt(void)
+{
+	int retval;
+	unsigned char ii;
+	unsigned char page;
+	unsigned char intr_count = 0;
+	unsigned char intr_off;
+	unsigned char intr_src;
+	unsigned short addr;
+	struct synaptics_rmi4_fn_desc fd;
+	struct synaptics_rmi4_data *rmi4_data = prox->rmi4_data;
+
+	for (page = 0; page < PAGES_TO_SERVICE; page++) {
+		for (addr = PDT_START; addr > PDT_END; addr -= PDT_ENTRY_SIZE) {
+			addr |= (page << 8);
+
+			retval = synaptics_rmi4_reg_read(rmi4_data,
+					addr,
+					(unsigned char *)&fd,
+					sizeof(fd));
+			if (retval < 0)
+				return retval;
+
+			addr &= ~(MASK_8BIT << 8);
+
+			if (fd.fn_number) {
+				dev_dbg(rmi4_data->pdev->dev.parent,
+						"%s: Found F%02x\n",
+						__func__, fd.fn_number);
+				switch (fd.fn_number) {
+				case SYNAPTICS_RMI4_F12:
+					goto f12_found;
+					break;
+				}
+			} else {
+				break;
+			}
+
+			intr_count += (fd.intr_src_count & MASK_3BIT);
+		}
+	}
+
+	dev_err(rmi4_data->pdev->dev.parent,
+			"%s: Failed to find F12\n",
+			__func__);
+	return -EINVAL;
+
+f12_found:
+	prox->query_base_addr = fd.query_base_addr | (page << 8);
+	prox->control_base_addr = fd.ctrl_base_addr | (page << 8);
+	prox->data_base_addr = fd.data_base_addr | (page << 8);
+	prox->command_base_addr = fd.cmd_base_addr | (page << 8);
+
+	retval = prox_reg_init();
+	if (retval < 0) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to initialize proximity registers\n",
+				__func__);
+		return retval;
+	}
+
+	prox->intr_mask = 0;
+	intr_src = fd.intr_src_count;
+	intr_off = intr_count % 8;
+	for (ii = intr_off;
+			ii < ((intr_src & MASK_3BIT) +
+			intr_off);
+			ii++) {
+		prox->intr_mask |= 1 << ii;
+	}
+
+	rmi4_data->intr_mask[0] |= prox->intr_mask;
+
+	addr = rmi4_data->f01_ctrl_base_addr + 1;
+
+	retval = synaptics_rmi4_reg_write(rmi4_data,
+			addr,
+			&(rmi4_data->intr_mask[0]),
+			sizeof(rmi4_data->intr_mask[0]));
+	if (retval < 0) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to set interrupt enable bit\n",
+				__func__);
+		return retval;
+	}
+
+	return 0;
+}
+
+static ssize_t synaptics_rmi4_hover_finger_en_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	if (!prox)
+		return -ENODEV;
+
+	return snprintf(buf, PAGE_SIZE, "%u\n",
+			prox->hover_finger_en);
+}
+
+static ssize_t synaptics_rmi4_hover_finger_en_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	int retval;
+	unsigned int input;
+	struct synaptics_rmi4_data *rmi4_data = prox->rmi4_data;
+
+	if (!prox)
+		return -ENODEV;
+
+	if (sscanf(buf, "%x", &input) != 1)
+		return -EINVAL;
+
+	if (input == 1)
+		prox->hover_finger_en = true;
+	else if (input == 0)
+		prox->hover_finger_en = false;
+	else
+		return -EINVAL;
+
+	retval = prox_set_hover_finger_en();
+	if (retval < 0) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to change hovering finger enable setting\n",
+				__func__);
+		return retval;
+	}
+
+	return count;
+}
+
+int synaptics_rmi4_prox_hover_finger_en(bool enable)
+{
+	int retval;
+
+	if (!prox)
+		return -ENODEV;
+
+	prox->hover_finger_en = enable;
+
+	retval = prox_set_hover_finger_en();
+	if (retval < 0)
+		return retval;
+
+	return 0;
+}
+EXPORT_SYMBOL(synaptics_rmi4_prox_hover_finger_en);
+
+static void synaptics_rmi4_prox_attn(struct synaptics_rmi4_data *rmi4_data,
+		unsigned char intr_mask)
+{
+	if (!prox)
+		return;
+
+	if (prox->intr_mask & intr_mask)
+		prox_hover_finger_report();
+
+	return;
+}
+
+static int synaptics_rmi4_prox_init(struct synaptics_rmi4_data *rmi4_data)
+{
+	int retval;
+	unsigned char attr_count;
+
+	prox = kzalloc(sizeof(*prox), GFP_KERNEL);
+	if (!prox) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to alloc mem for prox\n",
+				__func__);
+		retval = -ENOMEM;
+		goto exit;
+	}
+
+	prox->finger_data = kzalloc(sizeof(*(prox->finger_data)), GFP_KERNEL);
+	if (!prox->finger_data) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to alloc mem for finger_data\n",
+				__func__);
+		retval = -ENOMEM;
+		goto exit_free_prox;
+	}
+
+	prox->rmi4_data = rmi4_data;
+
+	retval = prox_scan_pdt();
+	if (retval < 0)
+		goto exit_free_finger_data;
+
+	prox->hover_finger_en = true;
+
+	retval = prox_set_hover_finger_en();
+	if (retval < 0)
+		return retval;
+
+	prox->prox_dev = input_allocate_device();
+	if (prox->prox_dev == NULL) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to allocate proximity device\n",
+				__func__);
+		retval = -ENOMEM;
+		goto exit_free_finger_data;
+	}
+
+	prox->prox_dev->name = PLATFORM_DRIVER_NAME;
+	prox->prox_dev->phys = PROX_PHYS_NAME;
+	prox->prox_dev->id.product = SYNAPTICS_DSX_DRIVER_PRODUCT;
+	prox->prox_dev->id.version = SYNAPTICS_DSX_DRIVER_VERSION;
+	prox->prox_dev->dev.parent = rmi4_data->pdev->dev.parent;
+	input_set_drvdata(prox->prox_dev, rmi4_data);
+
+	set_bit(EV_KEY, prox->prox_dev->evbit);
+	set_bit(EV_ABS, prox->prox_dev->evbit);
+	set_bit(BTN_TOUCH, prox->prox_dev->keybit);
+	set_bit(BTN_TOOL_FINGER, prox->prox_dev->keybit);
+#ifdef INPUT_PROP_DIRECT
+	set_bit(INPUT_PROP_DIRECT, prox->prox_dev->propbit);
+#endif
+
+	prox_set_params();
+
+	retval = input_register_device(prox->prox_dev);
+	if (retval) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to register proximity device\n",
+				__func__);
+		goto exit_free_input_device;
+	}
+
+	for (attr_count = 0; attr_count < ARRAY_SIZE(attrs); attr_count++) {
+		retval = sysfs_create_file(&rmi4_data->input_dev->dev.kobj,
+				&attrs[attr_count].attr);
+		if (retval < 0) {
+			dev_err(rmi4_data->pdev->dev.parent,
+					"%s: Failed to create sysfs attributes\n",
+					__func__);
+			goto exit_free_sysfs;
+		}
+	}
+
+	return 0;
+
+exit_free_sysfs:
+	for (attr_count--; attr_count >= 0; attr_count--) {
+		sysfs_remove_file(&rmi4_data->input_dev->dev.kobj,
+				&attrs[attr_count].attr);
+	}
+
+	input_unregister_device(prox->prox_dev);
+	prox->prox_dev = NULL;
+
+exit_free_input_device:
+	if (prox->prox_dev)
+		input_free_device(prox->prox_dev);
+
+exit_free_finger_data:
+	kfree(prox->finger_data);
+
+exit_free_prox:
+	kfree(prox);
+	prox = NULL;
+
+exit:
+	return retval;
+}
+
+static void synaptics_rmi4_prox_remove(struct synaptics_rmi4_data *rmi4_data)
+{
+	unsigned char attr_count;
+
+	if (!prox)
+		goto exit;
+
+	for (attr_count = 0; attr_count < ARRAY_SIZE(attrs); attr_count++) {
+		sysfs_remove_file(&rmi4_data->input_dev->dev.kobj,
+				&attrs[attr_count].attr);
+	}
+
+	input_unregister_device(prox->prox_dev);
+	kfree(prox->finger_data);
+	kfree(prox);
+	prox = NULL;
+
+exit:
+	complete(&prox_remove_complete);
+
+	return;
+}
+
+static void synaptics_rmi4_prox_reset(struct synaptics_rmi4_data *rmi4_data)
+{
+	if (!prox)
+		return;
+
+	prox_hover_finger_lift();
+
+	prox_scan_pdt();
+
+	prox_set_hover_finger_en();
+
+	prox_set_params();
+
+	return;
+}
+
+static void synaptics_rmi4_prox_reinit(struct synaptics_rmi4_data *rmi4_data)
+{
+	if (!prox)
+		return;
+
+	prox_hover_finger_lift();
+
+	prox_set_hover_finger_en();
+
+	return;
+}
+
+static void synaptics_rmi4_prox_e_suspend(struct synaptics_rmi4_data *rmi4_data)
+{
+	if (!prox)
+		return;
+
+	prox_hover_finger_lift();
+
+	return;
+}
+
+static void synaptics_rmi4_prox_suspend(struct synaptics_rmi4_data *rmi4_data)
+{
+	if (!prox)
+		return;
+
+	prox_hover_finger_lift();
+
+	return;
+}
+
+static struct synaptics_rmi4_exp_fn proximity_module = {
+	.fn_type = RMI_PROXIMITY,
+	.init = synaptics_rmi4_prox_init,
+	.remove = synaptics_rmi4_prox_remove,
+	.reset = synaptics_rmi4_prox_reset,
+	.reinit = synaptics_rmi4_prox_reinit,
+	.early_suspend = synaptics_rmi4_prox_e_suspend,
+	.suspend = synaptics_rmi4_prox_suspend,
+	.resume = NULL,
+	.late_resume = NULL,
+	.attn = synaptics_rmi4_prox_attn,
+};
+
+static int __init rmi4_proximity_module_init(void)
+{
+	synaptics_rmi4_new_function(&proximity_module, true);
+
+	return 0;
+}
+
+static void __exit rmi4_proximity_module_exit(void)
+{
+	synaptics_rmi4_new_function(&proximity_module, false);
+
+	wait_for_completion(&prox_remove_complete);
+
+	return;
+}
+
+module_init(rmi4_proximity_module_init);
+module_exit(rmi4_proximity_module_exit);
+
+MODULE_AUTHOR("Synaptics, Inc.");
+MODULE_DESCRIPTION("Synaptics DSX Proximity Module");
+MODULE_LICENSE("GPL v2");

drivers/input/touchscreen/synaptics_dsx/synaptics_dsx_rmi_dev.c

@@ -0,0 +1,781 @@
+/*
+ * Synaptics DSX touchscreen driver
+ *
+ * Copyright (C) 2012 Synaptics Incorporated
+ *
+ * Copyright (C) 2012 Alexandra Chin <alexandra.chin@tw.synaptics.com>
+ * Copyright (C) 2012 Scott Lin <scott.lin@tw.synaptics.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/gpio.h>
+#include <linux/uaccess.h>
+#include <linux/cdev.h>
+#include <linux/platform_device.h>
+#include <linux/input/synaptics_dsx.h>
+#include "synaptics_dsx_core.h"
+
+#define CHAR_DEVICE_NAME "rmi"
+#define DEVICE_CLASS_NAME "rmidev"
+#define SYSFS_FOLDER_NAME "rmidev"
+#define DEV_NUMBER 1
+#define REG_ADDR_LIMIT 0xFFFF
+
+static ssize_t rmidev_sysfs_data_show(struct file *data_file,
+		struct kobject *kobj, struct bin_attribute *attributes,
+		char *buf, loff_t pos, size_t count);
+
+static ssize_t rmidev_sysfs_data_store(struct file *data_file,
+		struct kobject *kobj, struct bin_attribute *attributes,
+		char *buf, loff_t pos, size_t count);
+
+static ssize_t rmidev_sysfs_open_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count);
+
+static ssize_t rmidev_sysfs_release_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count);
+
+static ssize_t rmidev_sysfs_attn_state_show(struct device *dev,
+		struct device_attribute *attr, char *buf);
+
+struct rmidev_handle {
+	dev_t dev_no;
+	struct device dev;
+	struct synaptics_rmi4_data *rmi4_data;
+	struct kobject *sysfs_dir;
+	void *data;
+	bool irq_enabled;
+};
+
+struct rmidev_data {
+	int ref_count;
+	struct cdev main_dev;
+	struct class *device_class;
+	struct mutex file_mutex;
+	struct rmidev_handle *rmi_dev;
+};
+
+static struct bin_attribute attr_data = {
+	.attr = {
+		.name = "data",
+		.mode = (S_IRUGO | S_IWUGO),
+	},
+	.size = 0,
+	.read = rmidev_sysfs_data_show,
+	.write = rmidev_sysfs_data_store,
+};
+
+static struct device_attribute attrs[] = {
+	__ATTR(open, S_IWUGO,
+			synaptics_rmi4_show_error,
+			rmidev_sysfs_open_store),
+	__ATTR(release, S_IWUGO,
+			synaptics_rmi4_show_error,
+			rmidev_sysfs_release_store),
+	__ATTR(attn_state, S_IRUGO,
+			rmidev_sysfs_attn_state_show,
+			synaptics_rmi4_store_error),
+};
+
+static int rmidev_major_num;
+
+static struct class *rmidev_device_class;
+
+static struct rmidev_handle *rmidev;
+
+DECLARE_COMPLETION(rmidev_remove_complete);
+
+static irqreturn_t rmidev_sysfs_irq(int irq, void *data)
+{
+	struct synaptics_rmi4_data *rmi4_data = data;
+
+	sysfs_notify(&rmi4_data->input_dev->dev.kobj,
+			SYSFS_FOLDER_NAME, "attn_state");
+
+	return IRQ_HANDLED;
+}
+
+static int rmidev_sysfs_irq_enable(struct synaptics_rmi4_data *rmi4_data,
+		bool enable)
+{
+	int retval = 0;
+	unsigned char intr_status[MAX_INTR_REGISTERS];
+	unsigned long irq_flags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING;
+
+	if (enable) {
+		if (rmidev->irq_enabled)
+			return retval;
+
+		/* Clear interrupts first */
+		retval = synaptics_rmi4_reg_read(rmi4_data,
+				rmi4_data->f01_data_base_addr + 1,
+				intr_status,
+				rmi4_data->num_of_intr_regs);
+		if (retval < 0)
+			return retval;
+
+		retval = request_threaded_irq(rmi4_data->irq, NULL,
+				rmidev_sysfs_irq, irq_flags,
+				"synaptics_dsx_rmidev", rmi4_data);
+		if (retval < 0) {
+			dev_err(rmi4_data->pdev->dev.parent,
+					"%s: Failed to create irq thread\n",
+					__func__);
+			return retval;
+		}
+
+		rmidev->irq_enabled = true;
+	} else {
+		if (rmidev->irq_enabled) {
+			disable_irq(rmi4_data->irq);
+			free_irq(rmi4_data->irq, rmi4_data);
+			rmidev->irq_enabled = false;
+		}
+	}
+
+	return retval;
+}
+
+static ssize_t rmidev_sysfs_data_show(struct file *data_file,
+		struct kobject *kobj, struct bin_attribute *attributes,
+		char *buf, loff_t pos, size_t count)
+{
+	int retval;
+	unsigned int length = (unsigned int)count;
+	unsigned short address = (unsigned short)pos;
+	struct synaptics_rmi4_data *rmi4_data = rmidev->rmi4_data;
+
+	if (length > (REG_ADDR_LIMIT - address)) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Out of register map limit\n",
+				__func__);
+		return -EINVAL;
+	}
+
+	if (length) {
+		retval = synaptics_rmi4_reg_read(rmi4_data,
+				address,
+				(unsigned char *)buf,
+				length);
+		if (retval < 0) {
+			dev_err(rmi4_data->pdev->dev.parent,
+					"%s: Failed to read data\n",
+					__func__);
+			return retval;
+		}
+	} else {
+		return -EINVAL;
+	}
+
+	return length;
+}
+
+static ssize_t rmidev_sysfs_data_store(struct file *data_file,
+		struct kobject *kobj, struct bin_attribute *attributes,
+		char *buf, loff_t pos, size_t count)
+{
+	int retval;
+	unsigned int length = (unsigned int)count;
+	unsigned short address = (unsigned short)pos;
+	struct synaptics_rmi4_data *rmi4_data = rmidev->rmi4_data;
+
+	if (length > (REG_ADDR_LIMIT - address)) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Out of register map limit\n",
+				__func__);
+		return -EINVAL;
+	}
+
+	if (length) {
+		retval = synaptics_rmi4_reg_write(rmi4_data,
+				address,
+				(unsigned char *)buf,
+				length);
+		if (retval < 0) {
+			dev_err(rmi4_data->pdev->dev.parent,
+					"%s: Failed to write data\n",
+					__func__);
+			return retval;
+		}
+	} else {
+		return -EINVAL;
+	}
+
+	return length;
+}
+
+static ssize_t rmidev_sysfs_open_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	unsigned int input;
+	struct synaptics_rmi4_data *rmi4_data = rmidev->rmi4_data;
+
+	if (sscanf(buf, "%u", &input) != 1)
+		return -EINVAL;
+
+	if (input != 1)
+		return -EINVAL;
+
+	rmi4_data->irq_enable(rmi4_data, false);
+	rmidev_sysfs_irq_enable(rmi4_data, true);
+
+	dev_dbg(rmi4_data->pdev->dev.parent,
+			"%s: Attention interrupt disabled\n",
+			__func__);
+
+	return count;
+}
+
+static ssize_t rmidev_sysfs_release_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	unsigned int input;
+	struct synaptics_rmi4_data *rmi4_data = rmidev->rmi4_data;
+
+	if (sscanf(buf, "%u", &input) != 1)
+		return -EINVAL;
+
+	if (input != 1)
+		return -EINVAL;
+
+	rmi4_data->reset_device(rmi4_data);
+
+	rmidev_sysfs_irq_enable(rmi4_data, false);
+	rmi4_data->irq_enable(rmi4_data, true);
+
+	dev_dbg(rmi4_data->pdev->dev.parent,
+			"%s: Attention interrupt enabled\n",
+			__func__);
+
+	return count;
+}
+
+static ssize_t rmidev_sysfs_attn_state_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	int attn_state;
+	struct synaptics_rmi4_data *rmi4_data = rmidev->rmi4_data;
+	const struct synaptics_dsx_board_data *bdata =
+			rmi4_data->hw_if->board_data;
+
+	attn_state = gpio_get_value(bdata->irq_gpio);
+
+	return snprintf(buf, PAGE_SIZE, "%u\n", attn_state);
+}
+
+/*
+ * rmidev_llseek - used to set up register address
+ *
+ * @filp: file structure for seek
+ * @off: offset
+ *   if whence == SEEK_SET,
+ *     high 16 bits: page address
+ *     low 16 bits: register address
+ *   if whence == SEEK_CUR,
+ *     offset from current position
+ *   if whence == SEEK_END,
+ *     offset from end position (0xFFFF)
+ * @whence: SEEK_SET, SEEK_CUR, or SEEK_END
+ */
+static loff_t rmidev_llseek(struct file *filp, loff_t off, int whence)
+{
+	loff_t newpos;
+	struct rmidev_data *dev_data = filp->private_data;
+	struct synaptics_rmi4_data *rmi4_data = rmidev->rmi4_data;
+
+	if (IS_ERR(dev_data)) {
+		pr_err("%s: Pointer of char device data is invalid", __func__);
+		return -EBADF;
+	}
+
+	mutex_lock(&(dev_data->file_mutex));
+
+	switch (whence) {
+	case SEEK_SET:
+		newpos = off;
+		break;
+	case SEEK_CUR:
+		newpos = filp->f_pos + off;
+		break;
+	case SEEK_END:
+		newpos = REG_ADDR_LIMIT + off;
+		break;
+	default:
+		newpos = -EINVAL;
+		goto clean_up;
+	}
+
+	if (newpos < 0 || newpos > REG_ADDR_LIMIT) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: New position 0x%04x is invalid\n",
+				__func__, (unsigned int)newpos);
+		newpos = -EINVAL;
+		goto clean_up;
+	}
+
+	filp->f_pos = newpos;
+
+clean_up:
+	mutex_unlock(&(dev_data->file_mutex));
+
+	return newpos;
+}
+
+/*
+ * rmidev_read: - use to read data from rmi device
+ *
+ * @filp: file structure for read
+ * @buf: user space buffer pointer
+ * @count: number of bytes to read
+ * @f_pos: offset (starting register address)
+ */
+static ssize_t rmidev_read(struct file *filp, char __user *buf,
+		size_t count, loff_t *f_pos)
+{
+	ssize_t retval;
+	unsigned char tmpbuf[count + 1];
+	struct rmidev_data *dev_data = filp->private_data;
+
+	if (IS_ERR(dev_data)) {
+		pr_err("%s: Pointer of char device data is invalid", __func__);
+		return -EBADF;
+	}
+
+	if (count == 0)
+		return 0;
+
+	if (count > (REG_ADDR_LIMIT - *f_pos))
+		count = REG_ADDR_LIMIT - *f_pos;
+
+	mutex_lock(&(dev_data->file_mutex));
+
+	retval = synaptics_rmi4_reg_read(rmidev->rmi4_data,
+			*f_pos,
+			tmpbuf,
+			count);
+	if (retval < 0)
+		goto clean_up;
+
+	if (copy_to_user(buf, tmpbuf, count))
+		retval = -EFAULT;
+	else
+		*f_pos += retval;
+
+clean_up:
+	mutex_unlock(&(dev_data->file_mutex));
+
+	return retval;
+}
+
+/*
+ * rmidev_write: - used to write data to rmi device
+ *
+ * @filep: file structure for write
+ * @buf: user space buffer pointer
+ * @count: number of bytes to write
+ * @f_pos: offset (starting register address)
+ */
+static ssize_t rmidev_write(struct file *filp, const char __user *buf,
+		size_t count, loff_t *f_pos)
+{
+	ssize_t retval;
+	unsigned char tmpbuf[count + 1];
+	struct rmidev_data *dev_data = filp->private_data;
+
+	if (IS_ERR(dev_data)) {
+		pr_err("%s: Pointer of char device data is invalid", __func__);
+		return -EBADF;
+	}
+
+	if (count == 0)
+		return 0;
+
+	if (count > (REG_ADDR_LIMIT - *f_pos))
+		count = REG_ADDR_LIMIT - *f_pos;
+
+	if (copy_from_user(tmpbuf, buf, count))
+		return -EFAULT;
+
+	mutex_lock(&(dev_data->file_mutex));
+
+	retval = synaptics_rmi4_reg_write(rmidev->rmi4_data,
+			*f_pos,
+			tmpbuf,
+			count);
+	if (retval >= 0)
+		*f_pos += retval;
+
+	mutex_unlock(&(dev_data->file_mutex));
+
+	return retval;
+}
+
+/*
+ * rmidev_open: enable access to rmi device
+ * @inp: inode struture
+ * @filp: file structure
+ */
+static int rmidev_open(struct inode *inp, struct file *filp)
+{
+	int retval = 0;
+	struct synaptics_rmi4_data *rmi4_data = rmidev->rmi4_data;
+	struct rmidev_data *dev_data =
+			container_of(inp->i_cdev, struct rmidev_data, main_dev);
+
+	if (!dev_data)
+		return -EACCES;
+
+	filp->private_data = dev_data;
+
+	mutex_lock(&(dev_data->file_mutex));
+
+	rmi4_data->irq_enable(rmi4_data, false);
+	dev_dbg(rmi4_data->pdev->dev.parent,
+			"%s: Attention interrupt disabled\n",
+			__func__);
+
+	if (dev_data->ref_count < 1)
+		dev_data->ref_count++;
+	else
+		retval = -EACCES;
+
+	mutex_unlock(&(dev_data->file_mutex));
+
+	return retval;
+}
+
+/*
+ * rmidev_release: - release access to rmi device
+ * @inp: inode structure
+ * @filp: file structure
+ */
+static int rmidev_release(struct inode *inp, struct file *filp)
+{
+	struct synaptics_rmi4_data *rmi4_data = rmidev->rmi4_data;
+	struct rmidev_data *dev_data =
+			container_of(inp->i_cdev, struct rmidev_data, main_dev);
+
+	if (!dev_data)
+		return -EACCES;
+
+	rmi4_data->reset_device(rmi4_data);
+
+	mutex_lock(&(dev_data->file_mutex));
+
+	dev_data->ref_count--;
+	if (dev_data->ref_count < 0)
+		dev_data->ref_count = 0;
+
+	rmi4_data->irq_enable(rmi4_data, true);
+	dev_dbg(rmi4_data->pdev->dev.parent,
+			"%s: Attention interrupt enabled\n",
+			__func__);
+
+	mutex_unlock(&(dev_data->file_mutex));
+
+	return 0;
+}
+
+static const struct file_operations rmidev_fops = {
+	.owner = THIS_MODULE,
+	.llseek = rmidev_llseek,
+	.read = rmidev_read,
+	.write = rmidev_write,
+	.open = rmidev_open,
+	.release = rmidev_release,
+};
+
+static void rmidev_device_cleanup(struct rmidev_data *dev_data)
+{
+	dev_t devno;
+	struct synaptics_rmi4_data *rmi4_data = rmidev->rmi4_data;
+
+	if (dev_data) {
+		devno = dev_data->main_dev.dev;
+
+		if (dev_data->device_class)
+			device_destroy(dev_data->device_class, devno);
+
+		cdev_del(&dev_data->main_dev);
+
+		unregister_chrdev_region(devno, 1);
+
+		dev_dbg(rmi4_data->pdev->dev.parent,
+				"%s: rmidev device removed\n",
+				__func__);
+	}
+
+	return;
+}
+
+static char *rmi_char_devnode(struct device *dev, mode_t *mode)
+{
+	if (!mode)
+		return NULL;
+
+	*mode = (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
+
+	return kasprintf(GFP_KERNEL, "rmi/%s", dev_name(dev));
+}
+
+static int rmidev_create_device_class(void)
+{
+	rmidev_device_class = class_create(THIS_MODULE, DEVICE_CLASS_NAME);
+
+	if (IS_ERR(rmidev_device_class)) {
+		pr_err("%s: Failed to create /dev/%s\n",
+				__func__, CHAR_DEVICE_NAME);
+		return -ENODEV;
+	}
+
+	rmidev_device_class->devnode = rmi_char_devnode;
+
+	return 0;
+}
+
+static int rmidev_init_device(struct synaptics_rmi4_data *rmi4_data)
+{
+	int retval;
+	dev_t dev_no;
+	unsigned char attr_count;
+	struct rmidev_data *dev_data;
+	struct device *device_ptr;
+	const struct synaptics_dsx_board_data *bdata =
+				rmi4_data->hw_if->board_data;
+
+	rmidev = kzalloc(sizeof(*rmidev), GFP_KERNEL);
+	if (!rmidev) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to alloc mem for rmidev\n",
+				__func__);
+		retval = -ENOMEM;
+		goto err_rmidev;
+	}
+
+	rmidev->rmi4_data = rmi4_data;
+
+	retval = rmidev_create_device_class();
+	if (retval < 0) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to create device class\n",
+				__func__);
+		goto err_device_class;
+	}
+
+	if (rmidev_major_num) {
+		dev_no = MKDEV(rmidev_major_num, DEV_NUMBER);
+		retval = register_chrdev_region(dev_no, 1, CHAR_DEVICE_NAME);
+	} else {
+		retval = alloc_chrdev_region(&dev_no, 0, 1, CHAR_DEVICE_NAME);
+		if (retval < 0) {
+			dev_err(rmi4_data->pdev->dev.parent,
+					"%s: Failed to allocate char device region\n",
+					__func__);
+			goto err_device_region;
+		}
+
+		rmidev_major_num = MAJOR(dev_no);
+		dev_dbg(rmi4_data->pdev->dev.parent,
+				"%s: Major number of rmidev = %d\n",
+				__func__, rmidev_major_num);
+	}
+
+	dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL);
+	if (!dev_data) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to alloc mem for dev_data\n",
+				__func__);
+		retval = -ENOMEM;
+		goto err_dev_data;
+	}
+
+	mutex_init(&dev_data->file_mutex);
+	dev_data->rmi_dev = rmidev;
+	rmidev->data = dev_data;
+
+	cdev_init(&dev_data->main_dev, &rmidev_fops);
+
+	retval = cdev_add(&dev_data->main_dev, dev_no, 1);
+	if (retval < 0) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to add rmi char device\n",
+				__func__);
+		goto err_char_device;
+	}
+
+	dev_set_name(&rmidev->dev, "rmidev%d", MINOR(dev_no));
+	dev_data->device_class = rmidev_device_class;
+
+	device_ptr = device_create(dev_data->device_class, NULL, dev_no,
+			NULL, CHAR_DEVICE_NAME"%d", MINOR(dev_no));
+	if (IS_ERR(device_ptr)) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to create rmi char device\n",
+				__func__);
+		retval = -ENODEV;
+		goto err_char_device;
+	}
+
+	retval = gpio_export(bdata->irq_gpio, false);
+	if (retval < 0) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to export attention gpio\n",
+				__func__);
+	} else {
+		retval = gpio_export_link(&(rmi4_data->input_dev->dev),
+				"attn", bdata->irq_gpio);
+		if (retval < 0) {
+			dev_err(rmi4_data->pdev->dev.parent,
+					"%s Failed to create gpio symlink\n",
+					__func__);
+		} else {
+			dev_dbg(rmi4_data->pdev->dev.parent,
+					"%s: Exported attention gpio %d\n",
+					__func__, bdata->irq_gpio);
+		}
+	}
+
+	rmidev->sysfs_dir = kobject_create_and_add(SYSFS_FOLDER_NAME,
+			&rmi4_data->input_dev->dev.kobj);
+	if (!rmidev->sysfs_dir) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to create sysfs directory\n",
+				__func__);
+		retval = -ENODEV;
+		goto err_sysfs_dir;
+	}
+
+	retval = sysfs_create_bin_file(rmidev->sysfs_dir,
+			&attr_data);
+	if (retval < 0) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to create sysfs bin file\n",
+				__func__);
+		goto err_sysfs_bin;
+	}
+
+	for (attr_count = 0; attr_count < ARRAY_SIZE(attrs); attr_count++) {
+		retval = sysfs_create_file(rmidev->sysfs_dir,
+				&attrs[attr_count].attr);
+		if (retval < 0) {
+			dev_err(rmi4_data->pdev->dev.parent,
+					"%s: Failed to create sysfs attributes\n",
+					__func__);
+			retval = -ENODEV;
+			goto err_sysfs_attrs;
+		}
+	}
+
+	return 0;
+
+err_sysfs_attrs:
+	for (attr_count--; attr_count >= 0; attr_count--)
+		sysfs_remove_file(rmidev->sysfs_dir, &attrs[attr_count].attr);
+
+	sysfs_remove_bin_file(rmidev->sysfs_dir, &attr_data);
+
+err_sysfs_bin:
+	kobject_put(rmidev->sysfs_dir);
+
+err_sysfs_dir:
+err_char_device:
+	rmidev_device_cleanup(dev_data);
+	kfree(dev_data);
+
+err_dev_data:
+	unregister_chrdev_region(dev_no, 1);
+
+err_device_region:
+	class_destroy(rmidev_device_class);
+
+err_device_class:
+	kfree(rmidev);
+	rmidev = NULL;
+
+err_rmidev:
+	return retval;
+}
+
+static void rmidev_remove_device(struct synaptics_rmi4_data *rmi4_data)
+{
+	unsigned char attr_count;
+	struct rmidev_data *dev_data;
+
+	if (!rmidev)
+		goto exit;
+
+	for (attr_count = 0; attr_count < ARRAY_SIZE(attrs); attr_count++)
+		sysfs_remove_file(rmidev->sysfs_dir, &attrs[attr_count].attr);
+
+	sysfs_remove_bin_file(rmidev->sysfs_dir, &attr_data);
+
+	kobject_put(rmidev->sysfs_dir);
+
+	dev_data = rmidev->data;
+	if (dev_data) {
+		rmidev_device_cleanup(dev_data);
+		kfree(dev_data);
+	}
+
+	unregister_chrdev_region(rmidev->dev_no, 1);
+
+	class_destroy(rmidev_device_class);
+
+	kfree(rmidev);
+	rmidev = NULL;
+
+exit:
+	complete(&rmidev_remove_complete);
+
+	return;
+}
+
+static struct synaptics_rmi4_exp_fn rmidev_module = {
+	.fn_type = RMI_DEV,
+	.init = rmidev_init_device,
+	.remove = rmidev_remove_device,
+	.reset = NULL,
+	.reinit = NULL,
+	.early_suspend = NULL,
+	.suspend = NULL,
+	.resume = NULL,
+	.late_resume = NULL,
+	.attn = NULL,
+};
+
+static int __init rmidev_module_init(void)
+{
+	synaptics_rmi4_new_function(&rmidev_module, true);
+
+	return 0;
+}
+
+static void __exit rmidev_module_exit(void)
+{
+	synaptics_rmi4_new_function(&rmidev_module, false);
+
+	wait_for_completion(&rmidev_remove_complete);
+
+	return;
+}
+
+module_init(rmidev_module_init);
+module_exit(rmidev_module_exit);
+
+MODULE_AUTHOR("Synaptics, Inc.");
+MODULE_DESCRIPTION("Synaptics DSX RMI Dev Module");
+MODULE_LICENSE("GPL v2");

drivers/input/touchscreen/synaptics_dsx/synaptics_dsx_spi.c

@@ -0,0 +1,335 @@
+/*
+ * Synaptics DSX touchscreen driver
+ *
+ * Copyright (C) 2012 Synaptics Incorporated
+ *
+ * Copyright (C) 2012 Alexandra Chin <alexandra.chin@tw.synaptics.com>
+ * Copyright (C) 2012 Scott Lin <scott.lin@tw.synaptics.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/spi/spi.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/types.h>
+#include <linux/platform_device.h>
+#include <linux/input/synaptics_dsx.h>
+#include "synaptics_dsx_core.h"
+
+#define SPI_READ 0x80
+#define SPI_WRITE 0x00
+
+static int synaptics_rmi4_spi_set_page(struct synaptics_rmi4_data *rmi4_data,
+		unsigned short addr)
+{
+	int retval;
+	unsigned int index;
+	unsigned int xfer_count = PAGE_SELECT_LEN + 1;
+	unsigned char txbuf[xfer_count];
+	unsigned char page;
+	struct spi_message msg;
+	struct spi_transfer xfers[xfer_count];
+	struct spi_device *spi = to_spi_device(rmi4_data->pdev->dev.parent);
+	const struct synaptics_dsx_board_data *bdata =
+			rmi4_data->hw_if->board_data;
+
+	page = ((addr >> 8) & ~MASK_7BIT);
+	if (page != rmi4_data->current_page) {
+		spi_message_init(&msg);
+
+		txbuf[0] = SPI_WRITE;
+		txbuf[1] = MASK_8BIT;
+		txbuf[2] = page;
+
+		for (index = 0; index < xfer_count; index++) {
+			memset(&xfers[index], 0, sizeof(struct spi_transfer));
+			xfers[index].len = 1;
+			xfers[index].delay_usecs = bdata->byte_delay_us;
+			xfers[index].tx_buf = &txbuf[index];
+			spi_message_add_tail(&xfers[index], &msg);
+		}
+
+		if (bdata->block_delay_us)
+			xfers[index - 1].delay_usecs = bdata->block_delay_us;
+
+		retval = spi_sync(spi, &msg);
+		if (retval == 0) {
+			rmi4_data->current_page = page;
+			retval = PAGE_SELECT_LEN;
+		} else {
+			dev_err(rmi4_data->pdev->dev.parent,
+					"%s: Failed to complete SPI transfer, error = %d\n",
+					__func__, retval);
+		}
+	} else {
+		retval = PAGE_SELECT_LEN;
+	}
+
+	return retval;
+}
+
+static int synaptics_rmi4_spi_read(struct synaptics_rmi4_data *rmi4_data,
+		unsigned short addr, unsigned char *data, unsigned short length)
+{
+	int retval;
+	unsigned int index;
+	unsigned int xfer_count = length + ADDRESS_WORD_LEN;
+	unsigned char txbuf[ADDRESS_WORD_LEN];
+	unsigned char *rxbuf = NULL;
+	struct spi_message msg;
+	struct spi_transfer *xfers = NULL;
+	struct spi_device *spi = to_spi_device(rmi4_data->pdev->dev.parent);
+	const struct synaptics_dsx_board_data *bdata =
+			rmi4_data->hw_if->board_data;
+
+	spi_message_init(&msg);
+
+	xfers = kcalloc(xfer_count, sizeof(struct spi_transfer), GFP_KERNEL);
+	if (!xfers) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to allocate memory for xfers\n",
+				__func__);
+		retval = -ENOMEM;
+		goto exit;
+	}
+
+	txbuf[0] = (addr >> 8) | SPI_READ;
+	txbuf[1] = addr & MASK_8BIT;
+
+	rxbuf = kmalloc(length, GFP_KERNEL);
+	if (!rxbuf) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to allocate memory for rxbuf\n",
+				__func__);
+		retval = -ENOMEM;
+		goto exit;
+	}
+
+	mutex_lock(&rmi4_data->rmi4_io_ctrl_mutex);
+
+	retval = synaptics_rmi4_spi_set_page(rmi4_data, addr);
+	if (retval != PAGE_SELECT_LEN) {
+		retval = -EIO;
+		goto exit;
+	}
+
+	for (index = 0; index < xfer_count; index++) {
+		xfers[index].len = 1;
+		xfers[index].delay_usecs = bdata->byte_delay_us;
+		if (index < ADDRESS_WORD_LEN)
+			xfers[index].tx_buf = &txbuf[index];
+		else
+			xfers[index].rx_buf = &rxbuf[index - ADDRESS_WORD_LEN];
+		spi_message_add_tail(&xfers[index], &msg);
+	}
+
+	if (bdata->block_delay_us)
+		xfers[index - 1].delay_usecs = bdata->block_delay_us;
+
+	retval = spi_sync(spi, &msg);
+	if (retval == 0) {
+		retval = length;
+		memcpy(data, rxbuf, length);
+	} else {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to complete SPI transfer, error = %d\n",
+				__func__, retval);
+	}
+
+	mutex_unlock(&rmi4_data->rmi4_io_ctrl_mutex);
+
+exit:
+	kfree(rxbuf);
+	kfree(xfers);
+
+	return retval;
+}
+
+static int synaptics_rmi4_spi_write(struct synaptics_rmi4_data *rmi4_data,
+		unsigned short addr, unsigned char *data, unsigned short length)
+{
+	int retval;
+	unsigned int index;
+	unsigned int xfer_count = length + ADDRESS_WORD_LEN;
+	unsigned char *txbuf = NULL;
+	struct spi_message msg;
+	struct spi_transfer *xfers = NULL;
+	struct spi_device *spi = to_spi_device(rmi4_data->pdev->dev.parent);
+	const struct synaptics_dsx_board_data *bdata =
+			rmi4_data->hw_if->board_data;
+
+	spi_message_init(&msg);
+
+	xfers = kcalloc(xfer_count, sizeof(struct spi_transfer), GFP_KERNEL);
+	if (!xfers) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to allocate memory for xfers\n",
+				__func__);
+		retval = -ENOMEM;
+		goto exit;
+	}
+
+	txbuf = kmalloc(xfer_count, GFP_KERNEL);
+	if (!txbuf) {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to allocate memory for txbuf\n",
+				__func__);
+		retval = -ENOMEM;
+		goto exit;
+	}
+
+	txbuf[0] = (addr >> 8) & ~SPI_READ;
+	txbuf[1] = addr & MASK_8BIT;
+	memcpy(&txbuf[ADDRESS_WORD_LEN], data, length);
+
+	mutex_lock(&rmi4_data->rmi4_io_ctrl_mutex);
+
+	retval = synaptics_rmi4_spi_set_page(rmi4_data, addr);
+	if (retval != PAGE_SELECT_LEN) {
+		retval = -EIO;
+		goto exit;
+	}
+
+	for (index = 0; index < xfer_count; index++) {
+		xfers[index].len = 1;
+		xfers[index].delay_usecs = bdata->byte_delay_us;
+		xfers[index].tx_buf = &txbuf[index];
+		spi_message_add_tail(&xfers[index], &msg);
+	}
+
+	if (bdata->block_delay_us)
+		xfers[index - 1].delay_usecs = bdata->block_delay_us;
+
+	retval = spi_sync(spi, &msg);
+	if (retval == 0) {
+		retval = length;
+	} else {
+		dev_err(rmi4_data->pdev->dev.parent,
+				"%s: Failed to complete SPI transfer, error = %d\n",
+				__func__, retval);
+	}
+
+	mutex_unlock(&rmi4_data->rmi4_io_ctrl_mutex);
+
+exit:
+	kfree(txbuf);
+	kfree(xfers);
+
+	return retval;
+}
+
+static struct synaptics_dsx_bus_access bus_access = {
+	.type = BUS_SPI,
+	.read = synaptics_rmi4_spi_read,
+	.write = synaptics_rmi4_spi_write,
+};
+
+static struct synaptics_dsx_hw_interface hw_if;
+
+static struct platform_device *synaptics_dsx_spi_device;
+
+static void synaptics_rmi4_spi_dev_release(struct device *dev)
+{
+	kfree(synaptics_dsx_spi_device);
+
+	return;
+}
+
+static int synaptics_rmi4_spi_probe(struct spi_device *spi)
+{
+	int retval;
+
+	if (spi->master->flags & SPI_MASTER_HALF_DUPLEX) {
+		dev_err(&spi->dev,
+				"%s: Full duplex not supported by host\n",
+				__func__);
+		return -EIO;
+	}
+
+	synaptics_dsx_spi_device = kzalloc(
+			sizeof(struct platform_device),
+			GFP_KERNEL);
+	if (!synaptics_dsx_spi_device) {
+		dev_err(&spi->dev,
+				"%s: Failed to allocate memory for synaptics_dsx_spi_device\n",
+				__func__);
+		return -ENOMEM;
+	}
+
+	spi->bits_per_word = 8;
+	spi->mode = SPI_MODE_3;
+
+	retval = spi_setup(spi);
+	if (retval < 0) {
+		dev_err(&spi->dev,
+				"%s: Failed to perform SPI setup\n",
+				__func__);
+		return retval;
+	}
+
+	hw_if.board_data = spi->dev.platform_data;
+	hw_if.bus_access = &bus_access;
+
+	synaptics_dsx_spi_device->name = PLATFORM_DRIVER_NAME;
+	synaptics_dsx_spi_device->id = 0;
+	synaptics_dsx_spi_device->num_resources = 0;
+	synaptics_dsx_spi_device->dev.parent = &spi->dev;
+	synaptics_dsx_spi_device->dev.platform_data = &hw_if;
+	synaptics_dsx_spi_device->dev.release = synaptics_rmi4_spi_dev_release;
+
+	retval = platform_device_register(synaptics_dsx_spi_device);
+	if (retval) {
+		dev_err(&spi->dev,
+				"%s: Failed to register platform device\n",
+				__func__);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int synaptics_rmi4_spi_remove(struct spi_device *spi)
+{
+	platform_device_unregister(synaptics_dsx_spi_device);
+
+	return 0;
+}
+
+static struct spi_driver synaptics_rmi4_spi_driver = {
+	.driver = {
+		.name = SPI_DRIVER_NAME,
+		.owner = THIS_MODULE,
+	},
+	.probe = synaptics_rmi4_spi_probe,
+	.remove = __devexit_p(synaptics_rmi4_spi_remove),
+};
+
+
+int synaptics_rmi4_bus_init(void)
+{
+	return spi_register_driver(&synaptics_rmi4_spi_driver);
+}
+EXPORT_SYMBOL(synaptics_rmi4_bus_init);
+
+void synaptics_rmi4_bus_exit(void)
+{
+	spi_unregister_driver(&synaptics_rmi4_spi_driver);
+
+	return;
+}
+EXPORT_SYMBOL(synaptics_rmi4_bus_exit);
+
+MODULE_AUTHOR("Synaptics, Inc.");
+MODULE_DESCRIPTION("Synaptics DSX SPI Bus Support Module");
+MODULE_LICENSE("GPL v2");

include/linux/input/synaptics_dsx_v2.h

@@ -0,0 +1,80 @@
+/*
+ * Synaptics DSX touchscreen driver
+ *
+ * Copyright (C) 2012 Synaptics Incorporated
+ *
+ * Copyright (C) 2012 Alexandra Chin <alexandra.chin@tw.synaptics.com>
+ * Copyright (C) 2012 Scott Lin <scott.lin@tw.synaptics.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#ifndef _SYNAPTICS_DSX_H_
+#define _SYNAPTICS_DSX_H_
+
+#define PLATFORM_DRIVER_NAME "synaptics_dsx"
+#define I2C_DRIVER_NAME "synaptics_dsx_i2c"
+#define SPI_DRIVER_NAME "synaptics_dsx_spi"
+
+/*
+ * struct synaptics_dsx_cap_button_map - 0d button map
+ * @nbuttons: number of 0d buttons
+ * @map: pointer to array of button types
+ */
+struct synaptics_dsx_cap_button_map {
+	unsigned char nbuttons;
+	unsigned char *map;
+};
+
+/*
+ * struct synaptics_dsx_board_data - dsx board data
+ * @x_flip: x flip flag
+ * @y_flip: y flip flag
+ * @irq_gpio: attention interrupt gpio
+ * @power_gpio: power switch gpio
+ * @power_on_state: power switch active state
+ * @reset_gpio: reset gpio
+ * @reset_on_state: reset active state
+ * @irq_flags: irq flags
+ * @panel_x: x-axis resolution of display panel
+ * @panel_y: y-axis resolution of display panel
+ * @power_delay_ms: delay time to wait after power-on
+ * @reset_delay_ms: delay time to wait after reset
+ * @reset_active_ms: reset active time
+ * @byte_delay_us: delay time between two bytes of SPI data
+ * @block_delay_us: delay time between two SPI transfers
+ * @regulator_name: pointer to name of regulator
+ * @gpio_config: pointer to gpio configuration function
+ * @cap_button_map: pointer to 0d button map
+ */
+struct synaptics_dsx_board_data {
+	bool x_flip;
+	bool y_flip;
+	bool swap_axes;
+	int irq_gpio;
+	int power_gpio;
+	int power_on_state;
+	int reset_gpio;
+	int reset_on_state;
+	unsigned long irq_flags;
+	unsigned int panel_x;
+	unsigned int panel_y;
+	unsigned int power_delay_ms;
+	unsigned int reset_delay_ms;
+	unsigned int reset_active_ms;
+	unsigned int byte_delay_us;
+	unsigned int block_delay_us;
+	unsigned char *regulator_name;
+	int (*gpio_config)(int gpio, bool configure, int dir, int state);
+	struct synaptics_dsx_cap_button_map *cap_button_map;
+};
+
+#endif