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Gmane
From: Benson Leung <bleung <at> chromium.org>
Subject: [PATCH] Input: add driver for Cypress APA I2C Trackpad
Newsgroups: gmane.linux.kernel.input
Date: Tuesday 10th July 2012 22:29:17 UTC (over 5 years ago)
This patch introduces a driver for Cypress All Points Addressable
I2C Trackpad, including the one in the Samsung Series 5 550 Chromebook.

This device is compatible with MT protocol type B, providing identifiable
contacts.

This driver also implements firmware updating capability via
request_firmware.

Signed-off-by: Dudley Du 
Signed-off-by: Benson Leung 
---
 drivers/input/mouse/Kconfig  |   13 +
 drivers/input/mouse/Makefile |    1 +
 drivers/input/mouse/cyapa.c  | 1493
++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 1507 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/mouse/cyapa.c

diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
index cd6268c..2767c3c 100644
--- a/drivers/input/mouse/Kconfig
+++ b/drivers/input/mouse/Kconfig
@@ -193,6 +193,19 @@ config MOUSE_BCM5974
 	  To compile this driver as a module, choose M here: the
 	  module will be called bcm5974.
 
+config MOUSE_CYAPA
+	tristate "Cypress APA I2C Trackpad support"
+	depends on I2C
+	help
+	  This driver add support for Cypress All Points Addressable (APA)
+	  I2C Trackpads, including the one in the Samsung Series 5 550
+	  Chromebook.
+
+	  Say Y here if you have a Cypress APA I2C Trackpad.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called cyapa.
+
 config MOUSE_INPORT
 	tristate "InPort/MS/ATIXL busmouse"
 	depends on ISA
diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
index 46ba755..10b4773 100644
--- a/drivers/input/mouse/Makefile
+++ b/drivers/input/mouse/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_MOUSE_AMIGA)		+= amimouse.o
 obj-$(CONFIG_MOUSE_APPLETOUCH)		+= appletouch.o
 obj-$(CONFIG_MOUSE_ATARI)		+= atarimouse.o
 obj-$(CONFIG_MOUSE_BCM5974)		+= bcm5974.o
+obj-$(CONFIG_MOUSE_CYAPA)		+= cyapa.o
 obj-$(CONFIG_MOUSE_GPIO)		+= gpio_mouse.o
 obj-$(CONFIG_MOUSE_INPORT)		+= inport.o
 obj-$(CONFIG_MOUSE_LOGIBM)		+= logibm.o
diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
new file mode 100644
index 0000000..8af0970
--- /dev/null
+++ b/drivers/input/mouse/cyapa.c
@@ -0,0 +1,1493 @@
+/*
+ * Cypress APA trackpad with I2C interface
+ *
+ * Author: Dudley Du 
+ * Further cleanup and restructuring by:
+ *   Daniel Kurtz 
+ *   Benson Leung 
+ *
+ * Copyright (C) 2011-2012 Cypress Semiconductor, Inc.
+ * Copyright (C) 2011-2012 Google, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General
Public
+ * License.  See the file COPYING in the main directory of this archive
for
+ * more details.
+ */
+
+
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+
+/* APA trackpad firmware generation */
+enum cyapa_gen {
+	CYAPA_GEN1 = 0x01,  /* only one finger supported. */
+	CYAPA_GEN2 = 0x02,  /* max five fingers supported. */
+	CYAPA_GEN3 = 0x03,  /* support MT-protocol B with tracking ID. */
+};
+
+#define CYAPA_NAME   "Cypress APA Trackpad (cyapa)"
+
+/* commands for read/write registers of Cypress trackpad */
+#define CYAPA_CMD_SOFT_RESET       0x00
+#define CYAPA_CMD_POWER_MODE       0x01
+#define CYAPA_CMD_DEV_STATUS       0x02
+#define CYAPA_CMD_GROUP_DATA       0x03
+#define CYAPA_CMD_GROUP_CTRL       0x04
+#define CYAPA_CMD_GROUP_CMD        0x05
+#define CYAPA_CMD_GROUP_QUERY      0x06
+#define CYAPA_CMD_BL_STATUS        0x07
+#define CYAPA_CMD_BL_HEAD          0x08
+#define CYAPA_CMD_BL_CMD           0x09
+#define CYAPA_CMD_BL_DATA          0x0a
+#define CYAPA_CMD_BL_ALL           0x0b
+#define CYAPA_CMD_BLK_PRODUCT_ID   0x0c
+#define CYAPA_CMD_BLK_HEAD         0x0d
+
+/* report data start reg offset address. */
+#define DATA_REG_START_OFFSET  0x0000
+
+#define BL_HEAD_OFFSET 0x00
+#define BL_DATA_OFFSET 0x10
+
+/*
+ * Operational Device Status Register
+ *
+ * bit 7: Valid interrupt source
+ * bit 6 - 4: Reserved
+ * bit 3 - 2: Power status
+ * bit 1 - 0: Device status
+ */
+#define REG_OP_STATUS     0x00
+#define OP_STATUS_SRC     0x80
+#define OP_STATUS_POWER   0x0c
+#define OP_STATUS_DEV     0x03
+#define OP_STATUS_MASK (OP_STATUS_SRC | OP_STATUS_POWER | OP_STATUS_DEV)
+
+/*
+ * Operational Finger Count/Button Flags Register
+ *
+ * bit 7 - 4: Number of touched finger
+ * bit 3: Valid data
+ * bit 2: Middle Physical Button
+ * bit 1: Right Physical Button
+ * bit 0: Left physical Button
+ */
+#define REG_OP_DATA1       0x01
+#define OP_DATA_VALID      0x08
+#define OP_DATA_MIDDLE_BTN 0x04
+#define OP_DATA_RIGHT_BTN  0x02
+#define OP_DATA_LEFT_BTN   0x01
+#define OP_DATA_BTN_MASK (OP_DATA_MIDDLE_BTN | OP_DATA_RIGHT_BTN | \
+			  OP_DATA_LEFT_BTN)
+
+/*
+ * Bootloader Status Register
+ *
+ * bit 7: Busy
+ * bit 6 - 5: Reserved
+ * bit 4: Bootloader running
+ * bit 3 - 1: Reserved
+ * bit 0: Checksum valid
+ */
+#define REG_BL_STATUS        0x01
+#define BL_STATUS_BUSY       0x80
+#define BL_STATUS_RUNNING    0x10
+#define BL_STATUS_DATA_VALID 0x08
+#define BL_STATUS_CSUM_VALID 0x01
+
+/*
+ * Bootloader Error Register
+ *
+ * bit 7: Invalid
+ * bit 6: Invalid security key
+ * bit 5: Bootloading
+ * bit 4: Command checksum
+ * bit 3: Flash protection error
+ * bit 2: Flash checksum error
+ * bit 1 - 0: Reserved
+ */
+#define REG_BL_ERROR         0x02
+#define BL_ERROR_INVALID     0x80
+#define BL_ERROR_INVALID_KEY 0x40
+#define BL_ERROR_BOOTLOADING 0x20
+#define BL_ERROR_CMD_CSUM    0x10
+#define BL_ERROR_FLASH_PROT  0x08
+#define BL_ERROR_FLASH_CSUM  0x04
+
+#define REG_BL_KEY1 0x0d
+#define REG_BL_KEY2 0x0e
+#define REG_BL_KEY3 0x0f
+#define BL_KEY1 0xc0
+#define BL_KEY2 0xc1
+#define BL_KEY3 0xc2
+
+#define BL_STATUS_SIZE  3  /* length of bootloader status registers */
+#define BLK_HEAD_BYTES 32
+
+/* Macro for register map group offset. */
+#define CYAPA_REG_MAP_SIZE  256
+
+#define PRODUCT_ID_SIZE  16
+#define QUERY_DATA_SIZE  27
+#define REG_PROTOCOL_GEN_QUERY_OFFSET  20
+
+#define REG_OFFSET_DATA_BASE     0x0000
+#define REG_OFFSET_CONTROL_BASE  0x0000
+#define REG_OFFSET_COMMAND_BASE  0x0028
+#define REG_OFFSET_QUERY_BASE    0x002a
+
+#define CYAPA_OFFSET_SOFT_RESET  REG_OFFSET_COMMAND_BASE
+
+#define REG_OFFSET_POWER_MODE (REG_OFFSET_COMMAND_BASE + 1)
+#define SET_POWER_MODE_DELAY   10000  /* unit: us */
+#define SET_POWER_MODE_TRIES   5
+
+#define PWR_MODE_MASK   0xfc
+#define PWR_MODE_FULL_ACTIVE (0x3f << 2)
+#define PWR_MODE_IDLE        (0x05 << 2) /* default sleep time is 50 ms.
*/
+#define PWR_MODE_BTN_ONLY    (0x01 << 2)
+#define PWR_MODE_OFF         (0x00 << 2)
+
+#define BTN_ONLY_MODE_NAME   "buttononly"
+
+#define PWR_STATUS_MASK      0x0c
+#define PWR_STATUS_ACTIVE    (0x03 << 2)
+#define PWR_STATUS_IDLE      (0x02 << 2)
+#define PWR_STATUS_BTN_ONLY  (0x01 << 2)
+#define PWR_STATUS_OFF       (0x00 << 2)
+
+/*
+ * CYAPA trackpad device states.
+ * Used in register 0x00, bit1-0, DeviceStatus field.
+ * After trackpad boots, and can report data, it sets this value.
+ * Other values indicate device is in an abnormal state and must be reset.
+ */
+#define CYAPA_DEV_NORMAL  0x03
+
+enum cyapa_state {
+	CYAPA_STATE_OP,
+	CYAPA_STATE_BL_IDLE,
+	CYAPA_STATE_BL_ACTIVE,
+	CYAPA_STATE_BL_BUSY,
+	CYAPA_STATE_NO_DEVICE,
+};
+
+
+struct cyapa_touch {
+	/*
+	 * high bits or x/y position value
+	 * bit 7 - 4: high 4 bits of x position value
+	 * bit 3 - 0: high 4 bits of y position value
+	 */
+	u8 xy;
+	u8 x;  /* low 8 bits of x position value. */
+	u8 y;  /* low 8 bits of y position value. */
+	u8 pressure;
+	/* id range is 1 - 15.  It is incremented with every new touch. */
+	u8 id;
+} __packed;
+
+/* The touch.id is used as the MT slot id, thus max MT slot is 15 */
+#define CYAPA_MAX_MT_SLOTS  15
+
+/* CYAPA reports up to 5 touches per packet. */
+#define CYAPA_MAX_TOUCHES  5
+
+struct cyapa_reg_data {
+	/*
+	 * bit 0 - 1: device status
+	 * bit 3 - 2: power mode
+	 * bit 6 - 4: reserved
+	 * bit 7: interrupt valid bit
+	 */
+	u8 device_status;
+	/*
+	 * bit 7 - 4: number of fingers currently touching pad
+	 * bit 3: valid data check bit
+	 * bit 2: middle mechanism button state if exists
+	 * bit 1: right mechanism button state if exists
+	 * bit 0: left mechanism button state if exists
+	 */
+	u8 finger_btn;
+	struct cyapa_touch touches[CYAPA_MAX_TOUCHES];
+} __packed;
+
+/* The main device structure */
+struct cyapa {
+	enum cyapa_state state;
+
+	struct i2c_client	*client;
+	struct input_dev	*input;
+	char *phys;	/* device physical location */
+	int irq;
+	bool irq_wake;  /* irq wake is enabled */
+
+	/* power mode settings */
+	u8 suspend_power_mode;
+
+	/* read from query data region. */
+	char product_id[16];
+	u8 capability[14];
+	u8 fw_maj_ver;  /* firmware major version. */
+	u8 fw_min_ver;  /* firmware minor version. */
+	u8 hw_maj_ver;  /* hardware major version. */
+	u8 hw_min_ver;  /* hardware minor version. */
+	enum cyapa_gen gen;
+	int max_abs_x;
+	int max_abs_y;
+	int physical_size_x;
+	int physical_size_y;
+};
+
+static const u8 bl_activate[] = { 0x00, 0xff, 0x38, 0x00, 0x01, 0x02,
0x03,
+		0x04, 0x05, 0x06, 0x07 };
+static const u8 bl_deactivate[] = { 0x00, 0xff, 0x3b, 0x00, 0x01, 0x02,
0x03,
+		0x04, 0x05, 0x06, 0x07 };
+static const u8 bl_exit[] = { 0x00, 0xff, 0xa5, 0x00, 0x01, 0x02, 0x03,
0x04,
+		0x05, 0x06, 0x07 };
+
+struct cyapa_cmd_len {
+	unsigned char cmd;
+	unsigned char len;
+};
+
+#define CYAPA_ADAPTER_FUNC_NONE   0
+#define CYAPA_ADAPTER_FUNC_I2C    1
+#define CYAPA_ADAPTER_FUNC_SMBUS  2
+#define CYAPA_ADAPTER_FUNC_BOTH   3
+
+static const struct cyapa_cmd_len cyapa_i2c_cmds[] = {
+	{CYAPA_OFFSET_SOFT_RESET, 1},
+	{REG_OFFSET_COMMAND_BASE + 1, 1},
+	{REG_OFFSET_DATA_BASE, 1},
+	{REG_OFFSET_DATA_BASE, sizeof(struct cyapa_reg_data)},
+	{REG_OFFSET_CONTROL_BASE, 0},
+	{REG_OFFSET_COMMAND_BASE, 0},
+	{REG_OFFSET_QUERY_BASE, QUERY_DATA_SIZE},
+	{BL_HEAD_OFFSET, 3},
+	{BL_HEAD_OFFSET, 16},
+	{BL_HEAD_OFFSET, 16},
+	{BL_DATA_OFFSET, 16},
+	{BL_HEAD_OFFSET, 32},
+	{REG_OFFSET_QUERY_BASE, PRODUCT_ID_SIZE},
+	{REG_OFFSET_DATA_BASE, 32}
+};
+
+#define CYAPA_FW_NAME		"cyapa.bin"
+#define CYAPA_FW_BLOCK_SIZE	64
+#define CYAPA_FW_HDR_START	0x0780
+#define CYAPA_FW_HDR_BLOCK_COUNT  2
+#define CYAPA_FW_HDR_BLOCK_START  (CYAPA_FW_HDR_START /
CYAPA_FW_BLOCK_SIZE)
+#define CYAPA_FW_HDR_SIZE	(CYAPA_FW_HDR_BLOCK_COUNT * \
+				 CYAPA_FW_BLOCK_SIZE)
+#define CYAPA_FW_DATA_START	0x0800
+#define CYAPA_FW_DATA_BLOCK_COUNT  480
+#define CYAPA_FW_DATA_BLOCK_START  (CYAPA_FW_DATA_START /
CYAPA_FW_BLOCK_SIZE)
+#define CYAPA_FW_DATA_SIZE	(CYAPA_FW_DATA_BLOCK_COUNT * \
+				 CYAPA_FW_BLOCK_SIZE)
+#define CYAPA_FW_SIZE		(CYAPA_FW_HDR_SIZE + CYAPA_FW_DATA_SIZE)
+#define CYAPA_CMD_LEN		16
+
+static void cyapa_detect(struct cyapa *cyapa);
+
+#define BYTE_PER_LINE  8
+void cyapa_dump_data(struct cyapa *cyapa, size_t length, const u8 *data)
+{
+	struct device *dev = &cyapa->client->dev;
+	int i;
+	char buf[BYTE_PER_LINE * 3 + 1];
+	char *s = buf;
+
+	for (i = 0; i < length; i++) {
+		s += sprintf(s, " %02x", data[i]);
+		if ((i + 1) == length || ((i + 1) % BYTE_PER_LINE) == 0) {
+			dev_dbg(dev, "%s\n", buf);
+			s = buf;
+		}
+	}
+}
+#undef BYTE_PER_LINE
+
+/*
+ * cyapa_i2c_reg_read_block - read a block of data from device i2c
registers
+ * @cyapa  - private data structure of driver
+ * @reg    - register at which to start reading
+ * @length - length of block to read, in bytes
+ * @values - buffer to store values read from registers
+ *
+ * Returns negative errno, else number of bytes read.
+ *
+ * Note: The trackpad register block is 256 bytes.
+ */
+static ssize_t cyapa_i2c_reg_read_block(struct cyapa *cyapa, u8 reg,
size_t len,
+					u8 *values)
+{
+	struct device *dev = &cyapa->client->dev;
+	ssize_t ret;
+
+	ret = i2c_smbus_read_i2c_block_data(cyapa->client, reg, len, values);
+	dev_dbg(dev, "i2c read block reg: 0x%02x len: %zu ret: %zd\n",
+		reg, len, ret);
+	if (ret > 0)
+		cyapa_dump_data(cyapa, ret, values);
+
+	return ret;
+}
+
+/*
+ * cyapa_i2c_reg_write_block - write a block of data to device i2c
registers
+ * @cyapa  - private data structure of driver
+ * @reg    - register at which to start writing
+ * @length - length of block to write, in bytes
+ * @values - buffer to write to i2c registers
+ *
+ * Returns 0 on success, else negative errno on failure.
+ *
+ * Note: The trackpad register block is 256 bytes.
+ */
+static ssize_t cyapa_i2c_reg_write_block(struct cyapa *cyapa, u8 reg,
+					 size_t len, const u8 *values)
+{
+	struct device *dev = &cyapa->client->dev;
+	ssize_t ret;
+
+	ret = i2c_smbus_write_i2c_block_data(cyapa->client, reg, len, values);
+	dev_dbg(dev, "i2c write block reg: 0x%02x len: %zu ret: %zd\n",
+		reg, len, ret);
+	cyapa_dump_data(cyapa, len, values);
+
+	return ret;
+}
+
+static s32 cyapa_read_byte(struct cyapa *cyapa, u8 cmd_idx)
+{
+	struct device *dev = &cyapa->client->dev;
+	int ret;
+	u8 cmd;
+
+	cmd = cyapa_i2c_cmds[cmd_idx].cmd;
+	ret = i2c_smbus_read_byte_data(cyapa->client, cmd);
+	dev_dbg(dev, "read byte [0x%02x] = 0x%02x  ret: %d\n",
+		cmd, ret, ret);
+
+	return ret;
+}
+
+static s32 cyapa_write_byte(struct cyapa *cyapa, u8 cmd_idx, u8 value)
+{
+	struct device *dev = &cyapa->client->dev;
+	int ret;
+	u8 cmd;
+
+	cmd = cyapa_i2c_cmds[cmd_idx].cmd;
+	ret = i2c_smbus_write_byte_data(cyapa->client, cmd, value);
+	dev_dbg(dev, "write byte [0x%02x] = 0x%02x  ret: %d\n",
+		cmd, value, ret);
+
+	return ret;
+}
+
+static ssize_t cyapa_read_block(struct cyapa *cyapa, u8 cmd_idx, u8
*values)
+{
+	u8 cmd;
+	size_t len;
+
+	cmd = cyapa_i2c_cmds[cmd_idx].cmd;
+	len = cyapa_i2c_cmds[cmd_idx].len;
+	return cyapa_i2c_reg_read_block(cyapa, cmd, len, values);
+}
+
+/*
+ * Query device for its current operating state.
+ *
+ * Possible states are:
+ *   OPERATION_MODE
+ *   BOOTLOADER_IDLE
+ *   BOOTLOADER_ACTIVE
+ *   BOOTLOADER_BUSY
+ *   NO_DEVICE
+ *
+ * Returns:
+ *   0 on success, and sets cyapa->state
+ *   < 0 on error, and sets cyapa->state = CYAPA_STATE_NO_DEVICE
+ */
+static int cyapa_get_state(struct cyapa *cyapa)
+{
+	struct device *dev = &cyapa->client->dev;
+	int ret;
+	u8 status[BL_STATUS_SIZE];
+
+	cyapa->state = CYAPA_STATE_NO_DEVICE;
+
+	/*
+	 * Get trackpad status by reading 3 registers starting from 0.
+	 * If the device is in the bootloader, this will be BL_HEAD.
+	 * If the device is in operation mode, this will be the DATA regs.
+	 *
+	 */
+	ret = cyapa_i2c_reg_read_block(cyapa, BL_HEAD_OFFSET, BL_STATUS_SIZE,
+				       status);
+	if (ret != BL_STATUS_SIZE)
+		return (ret < 0) ? ret : -EAGAIN;
+
+	if ((status[REG_OP_STATUS] & OP_STATUS_DEV) == CYAPA_DEV_NORMAL) {
+		dev_dbg(dev, "device state: operational mode\n");
+		cyapa->state = CYAPA_STATE_OP;
+	} else if (status[REG_BL_STATUS] & BL_STATUS_BUSY) {
+		dev_dbg(dev, "device state: bootloader busy\n");
+		cyapa->state = CYAPA_STATE_BL_BUSY;
+	} else if (status[REG_BL_ERROR] & BL_ERROR_BOOTLOADING) {
+		dev_dbg(dev, "device state: bootloader active\n");
+		cyapa->state = CYAPA_STATE_BL_ACTIVE;
+	} else {
+		dev_dbg(dev, "device state: bootloader idle\n");
+		cyapa->state = CYAPA_STATE_BL_IDLE;
+	}
+
+	return 0;
+}
+/*
+ * Poll device for its status in a loop, waiting up to timeout for a
response.
+ *
+ * When the device switches state, it usually takes ~300 ms.
+ * Howere, when running a new firmware image, the device must calibrate
its
+ * sensors, which can take as long as 2 seconds.
+ *
+ * Note: The timeout has granularity of the polling rate, which is 300 ms.
+ *
+ * Returns:
+ *   0 when the device eventually responds with a valid non-busy state.
+ *   -ETIMEDOUT if device never responds (too many -EAGAIN)
+ *   < 0    other errors
+ */
+static int cyapa_poll_state(struct cyapa *cyapa, unsigned int timeout)
+{
+	int ret;
+	int tries = timeout / 100;
+
+	ret = cyapa_get_state(cyapa);
+	while ((ret || cyapa->state >= CYAPA_STATE_BL_BUSY) && tries--) {
+		msleep(100);
+		ret = cyapa_get_state(cyapa);
+	}
+	return (ret == -EAGAIN || ret == -ETIMEDOUT) ? -ETIMEDOUT : ret;
+}
+
+/*
+ * Enter bootloader by soft resetting the device.
+ *
+ * If device is already in the bootloader, the function just returns.
+ * Otherwise, reset the device; after reset, device enters bootloader idle
+ * state immediately.
+ *
+ * Also, if device was unregister device from input core.  Device will
+ * re-register after it is detected following resumption of operational
mode.
+ *
+ * Returns:
+ *   0 on success
+ *   -EAGAIN  device was reset, but is not now in bootloader idle state
+ *   < 0 if the device never responds within the timeout
+ */
+static int cyapa_bl_enter(struct cyapa *cyapa)
+{
+	int ret;
+
+	if (cyapa->input) {
+		disable_irq(cyapa->irq);
+		input_unregister_device(cyapa->input);
+		cyapa->input = NULL;
+	}
+
+	if (cyapa->state != CYAPA_STATE_OP)
+		return 0;
+
+	cyapa->state = CYAPA_STATE_NO_DEVICE;
+	ret = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET, 0x01);
+	if (ret < 0)
+		return -EIO;
+
+	usleep_range(25000, 50000);
+	ret = cyapa_get_state(cyapa);
+	if (ret < 0)
+		return ret;
+	if (cyapa->state != CYAPA_STATE_BL_IDLE)
+		return -EAGAIN;
+
+	return 0;
+}
+
+static int cyapa_bl_activate(struct cyapa *cyapa)
+{
+	int ret;
+
+	ret = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_activate),
+					bl_activate);
+	if (ret < 0)
+		return ret;
+
+	/* Wait for bootloader to activate; takes between 2 and 12 seconds */
+	msleep(2000);
+	ret = cyapa_poll_state(cyapa, 10000);
+	if (ret < 0)
+		return ret;
+	if (cyapa->state != CYAPA_STATE_BL_ACTIVE)
+		return -EAGAIN;
+
+	return 0;
+}
+
+static int cyapa_bl_deactivate(struct cyapa *cyapa)
+{
+	int ret;
+
+	ret = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_deactivate),
+					bl_deactivate);
+	if (ret < 0)
+		return ret;
+
+	/* wait for bootloader to switch to idle state; should take < 100ms */
+	msleep(100);
+	ret = cyapa_poll_state(cyapa, 500);
+	if (ret < 0)
+		return ret;
+	if (cyapa->state != CYAPA_STATE_BL_IDLE)
+		return -EAGAIN;
+	return 0;
+}
+
+/*
+ * Exit bootloader
+ *
+ * Send bl_exit command, then wait 300 ms to let device transition to
+ * operational mode.  If this is the first time the device's firmware is
+ * running, it can take up to 2 seconds to calibrate its sensors.  So,
poll
+ * the device's new state for up to 2 seconds.
+ *
+ * Returns:
+ *   -EIO    failure while reading from device
+ *   -EAGAIN device is stuck in bootloader, b/c it has invalid firmware
+ *   0       device is supported and in operational mode
+ */
+static int cyapa_bl_exit(struct cyapa *cyapa)
+{
+	int ret;
+
+	ret = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_exit), bl_exit);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * Wait for bootloader to exit, and operation mode to start.
+	 * Normally, this takes at least 50 ms.
+	 */
+	usleep_range(50000, 100000);
+	/*
+	 * In addition, when a device boots for the first time after being
+	 * updated to new firmware, it must first calibrate its sensors, which
+	 * can take up to an additional 2 seconds.
+	 */
+	ret = cyapa_poll_state(cyapa, 2000);
+	if (ret < 0)
+		return ret;
+	if (cyapa->state != CYAPA_STATE_OP)
+		return -EAGAIN;
+
+	return 0;
+}
+
+/*
+ * Set device power mode
+ *
+ * Write to the field to configure power state. Power states include :
+ *   Full : Max scans and report rate.
+ *   Idle : Report rate set by user specified time.
+ *   ButtonOnly : No scans for fingers. When the button is triggered,
+ *     a slave interrupt is asserted to notify host to wake up.
+ *   Off : Only awake for i2c commands from host. No function for button
+ *     or touch sensors.
+ *
+ * The power_mode command should conform to the following :
+ *   Full : 0x3f
+ *   Idle : Configurable from 20 to 1000ms. See note below for
+ *     cyapa_sleep_time_to_pwr_cmd and cyapa_pwr_cmd_to_sleep_time
+ *   ButtonOnly : 0x01
+ *   Off : 0x00
+ *
+ * Device power mode can only be set when device is in operational mode.
+ */
+static int cyapa_set_power_mode(struct cyapa *cyapa, u8 power_mode)
+{
+	struct device *dev = &cyapa->client->dev;
+	int ret;
+	u8 power;
+	int tries = SET_POWER_MODE_TRIES;
+
+	if (cyapa->state != CYAPA_STATE_OP)
+		return 0;
+
+	while (true) {
+		ret = cyapa_read_byte(cyapa, CYAPA_CMD_POWER_MODE);
+		if (ret >= 0 || --tries < 1)
+			break;
+		dev_dbg(dev, "set power mode read retry. tries left = %d\n",
+			tries);
+		usleep_range(SET_POWER_MODE_DELAY, 2 * SET_POWER_MODE_DELAY);
+	}
+	if (ret < 0) {
+		dev_err(dev, "failed to read power mode %d\n", ret);
+		return ret;
+	}
+
+	power = ret;
+	power &= ~PWR_MODE_MASK;
+	power |= power_mode & PWR_MODE_MASK;
+	while (true) {
+		ret = cyapa_write_byte(cyapa, CYAPA_CMD_POWER_MODE, power);
+		if (!ret || --tries < 1)
+			break;
+		dev_dbg(dev, "set power mode write retry. tries left = %d\n",
+			tries);
+		usleep_range(SET_POWER_MODE_DELAY, 2 * SET_POWER_MODE_DELAY);
+	}
+	if (ret < 0)
+		dev_err(dev, "failed to set power_mode 0x%02x err = %d\n",
+			power_mode, ret);
+	return ret;
+}
+
+static int cyapa_get_query_data(struct cyapa *cyapa)
+{
+	u8 query_data[QUERY_DATA_SIZE];
+	int ret;
+
+	if (cyapa->state != CYAPA_STATE_OP)
+		return -EBUSY;
+
+	ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_QUERY, query_data);
+	if (ret < 0)
+		return ret;
+	if (ret != QUERY_DATA_SIZE)
+		return -EIO;
+
+	memcpy(&cyapa->product_id[0], &query_data[0], 5);
+	cyapa->product_id[5] = '-';
+	memcpy(&cyapa->product_id[6], &query_data[5], 6);
+	cyapa->product_id[12] = '-';
+	memcpy(&cyapa->product_id[13], &query_data[11], 2);
+	cyapa->product_id[15] = '\0';
+
+	cyapa->fw_maj_ver = query_data[15];
+	cyapa->fw_min_ver = query_data[16];
+	cyapa->hw_maj_ver = query_data[17];
+	cyapa->hw_min_ver = query_data[18];
+
+	cyapa->gen = query_data[20] & 0x0f;
+
+	cyapa->max_abs_x = ((query_data[21] & 0xf0) << 4) | query_data[22];
+	cyapa->max_abs_y = ((query_data[21] & 0x0f) << 8) | query_data[23];
+
+	cyapa->physical_size_x =
+		((query_data[24] & 0xf0) << 4) | query_data[25];
+	cyapa->physical_size_y =
+		((query_data[24] & 0x0f) << 8) | query_data[26];
+
+	return 0;
+}
+
+/*
+ * Check if device is operational.
+ *
+ * An operational device is responding, has exited bootloader, and has
+ * firmware supported by this driver.
+ *
+ * Returns:
+ *   -EBUSY  no device or in bootloader
+ *   -EIO    failure while reading from device
+ *   -EAGAIN device is still in bootloader
+ *           if ->state = CYAPA_STATE_BL_IDLE, device has invalid firmware
+ *   -EINVAL device is in operational mode, but not supported by this
driver
+ *   0       device is supported
+ */
+static int cyapa_check_is_operational(struct cyapa *cyapa)
+{
+	struct device *dev = &cyapa->client->dev;
+	const char unique_str[] = "CYTRA";
+	int ret;
+
+	ret = cyapa_poll_state(cyapa, 2000);
+	if (ret < 0)
+		return ret;
+	switch (cyapa->state) {
+	case CYAPA_STATE_BL_ACTIVE:
+		ret = cyapa_bl_deactivate(cyapa);
+		if (ret)
+			return ret;
+
+	/* Fallthrough state */
+	case CYAPA_STATE_BL_IDLE:
+		ret = cyapa_bl_exit(cyapa);
+		if (ret)
+			return ret;
+
+	/* Fallthrough state */
+	case CYAPA_STATE_OP:
+		ret = cyapa_get_query_data(cyapa);
+		if (ret < 0)
+			return ret;
+
+		/* only support firmware protocol gen3 */
+		if (cyapa->gen != CYAPA_GEN3) {
+			dev_err(dev, "unsupported protocol version (%d)",
+				cyapa->gen);
+			return -EINVAL;
+		}
+
+		/* only support product ID starting with CYTRA */
+		if (memcmp(cyapa->product_id, unique_str,
+			   sizeof(unique_str) - 1)) {
+			dev_err(dev, "unsupported product ID (%s)\n",
+				cyapa->product_id);
+			return -EINVAL;
+		}
+		return 0;
+
+	default:
+		return -EIO;
+	}
+	return 0;
+}
+
+static u16 cyapa_csum(const u8 *buf, size_t count)
+{
+	int i;
+	u16 csum = 0;
+
+	for (i = 0; i < count; i++)
+		csum += buf[i];
+
+	return csum;
+}
+
+/*
+ * Write a |len| byte long buffer |buf| to the device, by chopping it up
into a
+ * sequence of smaller |CYAPA_CMD_LEN|-length write commands.
+ *
+ * The data bytes for a write command are prepended with the 1-byte offset
+ * of the data relative to the start of |buf|.
+ */
+static int cyapa_write_buffer(struct cyapa *cyapa, const u8 *buf, size_t
len)
+{
+	int ret;
+	size_t i;
+	unsigned char cmd[CYAPA_CMD_LEN + 1];
+	size_t cmd_len;
+
+	for (i = 0; i < len; i += CYAPA_CMD_LEN) {
+		const u8 *payload = &buf[i];
+		cmd_len = (len - i >= CYAPA_CMD_LEN) ? CYAPA_CMD_LEN : len - i;
+		cmd[0] = i;
+		memcpy(&cmd[1], payload, cmd_len);
+
+		ret = cyapa_i2c_reg_write_block(cyapa, 0, cmd_len + 1, cmd);
+		if (ret < 0)
+			return ret;
+	}
+	return 0;
+}
+
+/*
+ * A firmware block write command writes 64 bytes of data to a single
flash
+ * page in the device.  The 78-byte block write command has the format:
+ *   <0xff>      
+ *
+ *  <0xff>  - every command starts with 0xff
+ *     - the write command value is 0x39
+ *     - write commands include an 8-byte key: { 00 01 02 03 04 05 06
07 }
+ *   - Memory Block number (address / 64) (16-bit, big-endian)
+ *    - 64 bytes of firmware image data
+ *   - sum of 64  bytes, modulo 0xff
+ *   - sum of 77 bytes, from 0xff to 
+ *
+ * Each write command is split into 5 i2c write transactions of up to 16
bytes.
+ * Each transaction starts with an i2c register offset: (00, 10, 20, 30,
40).
+ */
+static int cyapa_write_fw_block(struct cyapa *cyapa, u16 block, const u8
*data)
+{
+	int ret;
+	u8 cmd[78];
+	u8 status[BL_STATUS_SIZE];
+	int tries = 3;
+
+	/* set write command and security key bytes. */
+	cmd[0] = 0xff;
+	cmd[1] = 0x39;
+	cmd[2] = 0x00;
+	cmd[3] = 0x01;
+	cmd[4] = 0x02;
+	cmd[5] = 0x03;
+	cmd[6] = 0x04;
+	cmd[7] = 0x05;
+	cmd[8] = 0x06;
+	cmd[9] = 0x07;
+	cmd[10] = block >> 8;
+	cmd[11] = block;
+	memcpy(&cmd[12], data, CYAPA_FW_BLOCK_SIZE);
+	cmd[76] = cyapa_csum(data, CYAPA_FW_BLOCK_SIZE);
+	cmd[77] = cyapa_csum(cmd, sizeof(cmd) - 1);
+
+	ret = cyapa_write_buffer(cyapa, cmd, sizeof(cmd));
+	if (ret)
+		return ret;
+
+	/* wait for write to finish */
+	do {
+		usleep_range(10000, 20000);
+
+		/* check block write command result status. */
+		ret = cyapa_i2c_reg_read_block(cyapa, BL_HEAD_OFFSET,
+					       BL_STATUS_SIZE, status);
+		if (ret != BL_STATUS_SIZE)
+			return (ret < 0) ? ret : -EIO;
+		ret = (status[1] == 0x10 && status[2] == 0x20) ? 0 : -EIO;
+	} while (--tries && ret);
+
+	return ret;
+}
+
+/*
+ * Verify the integrity of a CYAPA firmware image file.
+ *
+ * The firmware image file is 30848 bytes, composed of 482 64-byte blocks.
+ *
+ * The first 2 blocks are the firmware header.
+ * The next 480 blocks are the firmware image.
+ *
+ * The first two bytes of the header hold the header checksum, computed by
+ * summing the other 126 bytes of the header.
+ * The last two bytes of the header hold the firmware image checksum,
computed
+ * by summing the 30720 bytes of the image modulo 0xffff.
+ *
+ * Both checksums are stored little-endian.
+ */
+static int cyapa_check_fw(struct cyapa *cyapa, const struct firmware *fw)
+{
+	struct device *dev = &cyapa->client->dev;
+	u16 csum;
+	u16 csum_expected;
+
+	/* Firmware must match exact 30848 bytes = 482 64-byte blocks. */
+	if (fw->size != CYAPA_FW_SIZE) {
+		dev_err(dev, "invalid firmware size = %zu, expected %u.\n",
+			fw->size, CYAPA_FW_SIZE);
+		return -EINVAL;
+	}
+
+	/* Verify header block */
+	csum_expected = (fw->data[0] << 8) | fw->data[1];
+	csum = cyapa_csum(&fw->data[2], CYAPA_FW_HDR_SIZE - 2);
+	if (csum != csum_expected) {
+		dev_err(dev, "invalid firmware header checksum = %04x,", csum);
+		dev_err(dev, " expected: %04x\n", csum_expected);
+		return -EINVAL;
+	}
+
+	/* Verify firmware image */
+	csum_expected = (fw->data[CYAPA_FW_HDR_SIZE - 2] << 8) |
+			 fw->data[CYAPA_FW_HDR_SIZE - 1];
+	csum = cyapa_csum(&fw->data[CYAPA_FW_HDR_SIZE], CYAPA_FW_DATA_SIZE);
+	if (csum != csum_expected) {
+		dev_err(dev, "invalid firmware checksum = %04x,", csum);
+		dev_err(dev, " expected: %04x\n", csum_expected);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int cyapa_firmware(struct cyapa *cyapa)
+{
+	struct device *dev = &cyapa->client->dev;
+	int ret;
+	const struct firmware *fw;
+	const char *fw_name = CYAPA_FW_NAME;
+	int i;
+
+	ret = request_firmware(&fw, CYAPA_FW_NAME, dev);
+	if (ret) {
+		dev_err(dev, "Could not load firmware from %s, %d\n",
+			  fw_name, ret);
+		return ret;
+	}
+
+	ret = cyapa_check_fw(cyapa, fw);
+	if (ret) {
+		dev_err(dev, "Invalid CYAPA firmware image: %s\n", fw_name);
+		goto done;
+	}
+
+	ret = cyapa_bl_enter(cyapa);
+	if (ret)
+		goto err_detect;
+
+	ret = cyapa_bl_activate(cyapa);
+	if (ret)
+		goto err_detect;
+
+	/* First write data, starting at byte 128  of fw->data */
+	for (i = 0; i < CYAPA_FW_DATA_BLOCK_COUNT; i++) {
+		size_t block = CYAPA_FW_DATA_BLOCK_START + i;
+		size_t addr = (i + CYAPA_FW_HDR_BLOCK_COUNT) *
+				CYAPA_FW_BLOCK_SIZE;
+		const u8 *data = &fw->data[addr];
+		ret = cyapa_write_fw_block(cyapa, block, data);
+		if (ret)
+			goto err_detect;
+	}
+
+	/* Then write checksum */
+	for (i = 0; i < CYAPA_FW_HDR_BLOCK_COUNT; i++) {
+		size_t block = CYAPA_FW_HDR_BLOCK_START + i;
+		size_t addr = i * CYAPA_FW_BLOCK_SIZE;
+		const u8 *data = &fw->data[addr];
+		ret = cyapa_write_fw_block(cyapa, block, data);
+		if (ret)
+			goto err_detect;
+	}
+
+err_detect:
+	cyapa_detect(cyapa);
+
+done:
+	release_firmware(fw);
+	return ret;
+}
+
+/*
+ *******************************************************************
+ *	Sysfs Interface.
+ *******************************************************************
+ */
+static ssize_t cyapa_show_fm_ver(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	return scnprintf(buf, PAGE_SIZE, "%d.%d\n", cyapa->fw_maj_ver,
+			 cyapa->fw_min_ver);
+}
+
+static ssize_t cyapa_show_hw_ver(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	return scnprintf(buf, PAGE_SIZE, "%d.%d\n", cyapa->hw_maj_ver,
+			 cyapa->hw_min_ver);
+}
+
+static ssize_t cyapa_show_product_id(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	return scnprintf(buf, PAGE_SIZE, "%s\n", cyapa->product_id);
+}
+
+static ssize_t cyapa_show_protocol_version(struct device *dev,
+					   struct device_attribute *attr,
+					   char *buf)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	return scnprintf(buf, PAGE_SIZE, "%d\n", cyapa->gen);
+}
+
+static ssize_t cyapa_update_fw_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	int ret;
+
+	ret = cyapa_firmware(cyapa);
+	if (ret)
+		dev_err(dev, "firmware update failed, %d\n", ret);
+	else
+		dev_dbg(dev, "firmware update succeeded\n");
+
+	return ret ? ret : count;
+}
+
+/*
+ * cyapa_sleep_time_to_pwr_cmd and cyapa_pwr_cmd_to_sleep_time
+ *
+ * These are helper functions that convert to and from integer idle
+ * times and register settings to write to the PowerMode register.
+ * The trackpad supports between 20ms to 1000ms scan intervals.
+ * The time will be increased in increments of 10ms from 20ms to 100ms.
+ * From 100ms to 1000ms, time will be increased in increments of 20ms.
+ *
+ * When Idle_Time < 100, the format to convert Idle_Time to Idle_Command
is:
+ *   Idle_Command = Idle Time / 10;
+ * When Idle_Time >= 100, the format to convert Idle_Time to Idle_Command
is:
+ *   Idle_Command = Idle Time / 20 + 5;
+ */
+static u8 cyapa_sleep_time_to_pwr_cmd(u16 sleep_time)
+{
+	if (sleep_time < 20)
+		sleep_time = 20;     /* minimal sleep time. */
+	else if (sleep_time > 1000)
+		sleep_time = 1000;   /* maximal sleep time. */
+
+	if (sleep_time < 100)
+		return ((sleep_time / 10) << 2) & PWR_MODE_MASK;
+	else
+		return ((sleep_time / 20 + 5) << 2) & PWR_MODE_MASK;
+}
+
+static u16 cyapa_pwr_cmd_to_sleep_time(u8 pwr_mode)
+{
+	u8 encoded_time = pwr_mode >> 2;
+	return (encoded_time < 10) ? encoded_time * 10
+				   : (encoded_time - 5) * 20;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static ssize_t cyapa_show_suspend_scanrate(struct device *dev,
+					   struct device_attribute *attr,
+					   char *buf)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	int len;
+	u8 pwr_cmd = cyapa->suspend_power_mode;
+
+	if (pwr_cmd == PWR_MODE_BTN_ONLY)
+		len = scnprintf(buf, PAGE_SIZE, "%s\n", BTN_ONLY_MODE_NAME);
+	else
+		len = scnprintf(buf, PAGE_SIZE, "%u\n",
+				cyapa_pwr_cmd_to_sleep_time(pwr_cmd));
+	return len;
+}
+
+static ssize_t cyapa_update_suspend_scanrate(struct device *dev,
+					     struct device_attribute *attr,
+					     const char *buf, size_t count)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	u8 pwr_cmd;
+	u16 sleep_time;
+
+	if (buf == NULL || count == 0)
+		goto invalidparam;
+
+	if (sysfs_streq(buf, BTN_ONLY_MODE_NAME))
+		pwr_cmd = PWR_MODE_BTN_ONLY;
+	else if (!kstrtou16(buf, 10, &sleep_time))
+		pwr_cmd = cyapa_sleep_time_to_pwr_cmd(sleep_time);
+	else
+		goto invalidparam;
+
+	cyapa->suspend_power_mode = pwr_cmd;
+	return count;
+
+invalidparam:
+	dev_err(dev, "invalid suspend scanrate ms parameters\n");
+	return -EINVAL;
+}
+
+static DEVICE_ATTR(suspend_scanrate_ms, S_IRUGO|S_IWUSR,
+		   cyapa_show_suspend_scanrate,
+		   cyapa_update_suspend_scanrate);
+
+static struct attribute *cyapa_power_wakeup_entries[] = {
+	&dev_attr_suspend_scanrate_ms.attr,
+	NULL,
+};
+
+static const struct attribute_group cyapa_power_wakeup_group = {
+	.name = power_group_name,
+	.attrs = cyapa_power_wakeup_entries,
+};
+#endif /* CONFIG_PM_SLEEP */
+
+static DEVICE_ATTR(firmware_version, S_IRUGO, cyapa_show_fm_ver, NULL);
+static DEVICE_ATTR(hardware_version, S_IRUGO, cyapa_show_hw_ver, NULL);
+static DEVICE_ATTR(product_id, S_IRUGO, cyapa_show_product_id, NULL);
+static DEVICE_ATTR(protocol_version, S_IRUGO, cyapa_show_protocol_version,
+		   NULL);
+static DEVICE_ATTR(update_fw, S_IWUSR, NULL, cyapa_update_fw_store);
+
+static struct attribute *cyapa_sysfs_entries[] = {
+	&dev_attr_firmware_version.attr,
+	&dev_attr_hardware_version.attr,
+	&dev_attr_product_id.attr,
+	&dev_attr_protocol_version.attr,
+	&dev_attr_update_fw.attr,
+	NULL,
+};
+
+static const struct attribute_group cyapa_sysfs_group = {
+	.attrs = cyapa_sysfs_entries,
+};
+
+/*
+ **************************************************************
+ * Cypress APA trackpad with I2C interface input device driver.
+ **************************************************************
+ */
+
+static irqreturn_t cyapa_irq(int irq, void *dev_id)
+{
+	struct cyapa *cyapa = dev_id;
+	struct device *dev = &cyapa->client->dev;
+	struct input_dev *input = cyapa->input;
+	struct cyapa_reg_data data;
+	int i;
+	int ret;
+	int num_fingers;
+	unsigned int mask;
+
+	/*
+	 * Don't read input if input device has not been configured.
+	 * This check check solves a race during probe() between irq_request()
+	 * and irq_disable(), since there is no way to request an irq that is
+	 * initially disabled.
+	 */
+	if (!input)
+		return IRQ_HANDLED;
+
+	if (device_may_wakeup(dev))
+		pm_wakeup_event(dev, 0);
+
+	ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_DATA, (u8 *)&data);
+	if (ret != sizeof(data))
+		return IRQ_HANDLED;
+
+	if ((data.device_status & OP_STATUS_SRC) != OP_STATUS_SRC ||
+	    (data.device_status & OP_STATUS_DEV) != CYAPA_DEV_NORMAL ||
+	    (data.finger_btn & OP_DATA_VALID) != OP_DATA_VALID) {
+		return IRQ_HANDLED;
+	}
+
+	mask = 0;
+	num_fingers = (data.finger_btn >> 4) & 0x0f;
+	for (i = 0; i < num_fingers; i++) {
+		const struct cyapa_touch *touch = &data.touches[i];
+		/* Note: touch->id range is 1 to 15; slots are 0 to 14. */
+		int slot = touch->id - 1;
+
+		mask |= (1 << slot);
+		input_mt_slot(input, slot);
+		input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
+		input_report_abs(input, ABS_MT_POSITION_X,
+				 ((touch->xy & 0xf0) << 4) | touch->x);
+		input_report_abs(input, ABS_MT_POSITION_Y,
+				 ((touch->xy & 0x0f) << 8) | touch->y);
+		input_report_abs(input, ABS_MT_PRESSURE, touch->pressure);
+	}
+
+	/* Invalidate all unreported slots */
+	for (i = 0; i < CYAPA_MAX_MT_SLOTS; i++) {
+		if (mask & (1 << i))
+			continue;
+		input_mt_slot(input, i);
+		input_mt_report_slot_state(input, MT_TOOL_FINGER, false);
+	}
+
+	input_mt_report_pointer_emulation(input, true);
+	input_report_key(input, BTN_LEFT, data.finger_btn & OP_DATA_BTN_MASK);
+	input_sync(input);
+
+	return IRQ_HANDLED;
+}
+
+static int cyapa_create_input_dev(struct cyapa *cyapa)
+{
+	struct device *dev = &cyapa->client->dev;
+	int ret;
+	struct input_dev *input;
+
+	dev_info(dev,
+		 "Cypress APA Trackpad Information:\n" \
+		 "    Product ID:  %s\n" \
+		 "    Protocol Generation:  %d\n" \
+		 "    Firmware Version:  %d.%d\n" \
+		 "    Hardware Version:  %d.%d\n" \
+		 "    Max ABS X,Y:   %d,%d\n" \
+		 "    Physical Size X,Y:   %d,%d\n",
+		 cyapa->product_id,
+		 cyapa->gen,
+		 cyapa->fw_maj_ver, cyapa->fw_min_ver,
+		 cyapa->hw_maj_ver, cyapa->hw_min_ver,
+		 cyapa->max_abs_x, cyapa->max_abs_y,
+		 cyapa->physical_size_x, cyapa->physical_size_y);
+
+	input = cyapa->input = input_allocate_device();
+	if (!input) {
+		dev_err(dev, "allocate memory for input device failed\n");
+		return -ENOMEM;
+	}
+
+	input->name = CYAPA_NAME;
+	input->phys = cyapa->phys;
+	input->id.bustype = BUS_I2C;
+	input->id.version = 1;
+	input->id.product = 0;  /* means any product in eventcomm. */
+	input->dev.parent = &cyapa->client->dev;
+
+	input_set_drvdata(input, cyapa);
+
+	__set_bit(EV_ABS, input->evbit);
+
+	/*
+	 * set and report not-MT axes to support synaptics X Driver.
+	 * When multi-fingers on trackpad, only the first finger touch
+	 * will be reported as X/Y axes values.
+	 */
+	input_set_abs_params(input, ABS_X, 0, cyapa->max_abs_x, 0, 0);
+	input_set_abs_params(input, ABS_Y, 0, cyapa->max_abs_y, 0, 0);
+	input_set_abs_params(input, ABS_PRESSURE, 0, 255, 0, 0);
+
+	/* finger position */
+	input_set_abs_params(input, ABS_MT_POSITION_X, 0, cyapa->max_abs_x, 0,
+			     0);
+	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cyapa->max_abs_y, 0,
+			     0);
+	input_set_abs_params(input, ABS_MT_PRESSURE, 0, 255, 0, 0);
+	ret = input_mt_init_slots(input, CYAPA_MAX_MT_SLOTS);
+	if (ret < 0) {
+		dev_err(dev, "allocate memory for MT slots failed, %d\n", ret);
+		goto err_free_device;
+	}
+
+	if (cyapa->physical_size_x && cyapa->physical_size_y) {
+		input_abs_set_res(input, ABS_X,
+			cyapa->max_abs_x / cyapa->physical_size_x);
+		input_abs_set_res(input, ABS_Y,
+			cyapa->max_abs_y / cyapa->physical_size_y);
+		input_abs_set_res(input, ABS_MT_POSITION_X,
+			cyapa->max_abs_x / cyapa->physical_size_x);
+		input_abs_set_res(input, ABS_MT_POSITION_Y,
+			cyapa->max_abs_y / cyapa->physical_size_y);
+	}
+
+	__set_bit(EV_KEY, input->evbit);
+	__set_bit(BTN_TOUCH, input->keybit);
+	__set_bit(BTN_TOOL_FINGER, input->keybit);
+	__set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
+	__set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
+	__set_bit(BTN_TOOL_QUADTAP, input->keybit);
+	__set_bit(BTN_TOOL_QUINTTAP, input->keybit);
+
+	__set_bit(BTN_LEFT, input->keybit);
+
+	__set_bit(INPUT_PROP_POINTER, input->propbit);
+	__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
+
+	/* Register the device in input subsystem */
+	ret = input_register_device(input);
+	if (ret) {
+		dev_err(dev, "input device register failed, %d\n", ret);
+		goto err_free_device;
+	}
+
+	enable_irq(cyapa->irq);
+	return 0;
+
+err_free_device:
+	input_free_device(input);
+	cyapa->input = NULL;
+	return ret;
+}
+
+static void cyapa_detect(struct cyapa *cyapa)
+{
+	struct device *dev = &cyapa->client->dev;
+	int ret;
+
+	ret = cyapa_check_is_operational(cyapa);
+	if (ret == -ETIMEDOUT) {
+		dev_err(dev, "no device detected, %d\n", ret);
+		return;
+	} else if (ret) {
+		dev_err(dev, "device detected, but not operational, %d\n", ret);
+		return;
+	}
+
+	if (!cyapa->input) {
+		ret = cyapa_create_input_dev(cyapa);
+		if (ret)
+			dev_err(dev, "create input_dev instance failed, %d\n",
+				ret);
+
+		/*
+		 * On some systems, a system crash / warm boot does not reset
+		 * the device's current power mode to FULL_ACTIVE.
+		 * If such an event happens during suspend, after the device
+		 * has been put in a low power mode, the device will still be
+		 * in low power mode on a subsequent boot, since there was
+		 * never a matching resume().
+		 * Handle this by always forcing full power here, when a
+		 * device is first detected to be in operational mode.
+		 */
+		ret = cyapa_set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE);
+		if (ret)
+			dev_warn(dev, "set active power failed, %d\n", ret);
+	}
+}
+
+static int __devinit cyapa_probe(struct i2c_client *client,
+				 const struct i2c_device_id *dev_id)
+{
+	int ret;
+	struct cyapa *cyapa;
+	struct device *dev = &client->dev;
+
+	cyapa = kzalloc(sizeof(struct cyapa), GFP_KERNEL);
+	if (!cyapa) {
+		dev_err(dev, "allocate memory for cyapa failed\n");
+		return -ENOMEM;
+	}
+
+	cyapa->gen = CYAPA_GEN3;
+	cyapa->client = client;
+	i2c_set_clientdata(client, cyapa);
+	cyapa->phys = kasprintf(GFP_KERNEL, "i2c-%d-%04x/input0",
+				client->adapter->nr, client->addr);
+	if (!cyapa->phys) {
+		ret = -ENOMEM;
+		goto err_mem_free;
+	}
+
+
+	cyapa->state = CYAPA_STATE_NO_DEVICE;
+	cyapa->suspend_power_mode = PWR_MODE_IDLE;
+
+	/*
+	 * Note: There is no way to request an irq that is initially disabled.
+	 * Thus, there is a little race here, which is resolved in cyapa_irq()
+	 * by checking that cyapa->input has been allocated, which happens
+	 * in cyapa_detect(), before creating input events.
+	 */
+	cyapa->irq = client->irq;
+	ret = request_threaded_irq(cyapa->irq,
+				   NULL,
+				   cyapa_irq,
+				   IRQF_TRIGGER_FALLING,
+				   "cyapa",
+				   cyapa);
+	if (ret) {
+		dev_err(dev, "IRQ request failed: %d\n, ", ret);
+		goto err_mem_free;
+	}
+	disable_irq(cyapa->irq);
+
+	if (sysfs_create_group(&client->dev.kobj, &cyapa_sysfs_group))
+		dev_warn(dev, "error creating sysfs entries.\n");
+
+#ifdef CONFIG_PM_SLEEP
+	if (device_can_wakeup(dev) &&
+	    sysfs_merge_group(&client->dev.kobj, &cyapa_power_wakeup_group))
+		dev_warn(dev, "error creating wakeup power entries.\n");
+#endif /* CONFIG_PM_SLEEP */
+
+	cyapa_detect(cyapa);
+
+	return 0;
+
+err_mem_free:
+	kfree(cyapa->phys);
+	kfree(cyapa);
+
+	return ret;
+}
+
+static int __devexit cyapa_remove(struct i2c_client *client)
+{
+	struct cyapa *cyapa = i2c_get_clientdata(client);
+
+	sysfs_remove_group(&client->dev.kobj, &cyapa_sysfs_group);
+
+	free_irq(cyapa->irq, cyapa);
+
+	if (cyapa->input)
+		input_unregister_device(cyapa->input);
+
+	kfree(cyapa->phys);
+	kfree(cyapa);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int cyapa_suspend(struct device *dev)
+{
+	int ret;
+	u8 power_mode;
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+
+	/* set trackpad device to idle mode if wakeup is allowed
+	 * otherwise turn off. */
+	power_mode = device_may_wakeup(dev) ? cyapa->suspend_power_mode
+					    : PWR_MODE_OFF;
+	ret = cyapa_set_power_mode(cyapa, power_mode);
+	if (ret < 0)
+		dev_err(dev, "set power mode failed, %d\n", ret);
+
+	if (device_may_wakeup(dev))
+		cyapa->irq_wake = (enable_irq_wake(cyapa->irq) == 0);
+	disable_irq(cyapa->irq);
+
+	return 0;
+}
+
+static int cyapa_resume(struct device *dev)
+{
+	int ret;
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+
+	enable_irq(cyapa->irq);
+	if (device_may_wakeup(dev) && cyapa->irq_wake)
+		disable_irq_wake(cyapa->irq);
+
+	cyapa_detect(cyapa);
+
+	ret = cyapa_set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE);
+	if (ret)
+		dev_warn(dev, "resume active power failed, %d\n", ret);
+
+	return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static SIMPLE_DEV_PM_OPS(cyapa_pm_ops, cyapa_suspend, cyapa_resume);
+
+static const struct i2c_device_id cyapa_id_table[] = {
+	{ "cyapa", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(i2c, cyapa_id_table);
+
+static struct i2c_driver cyapa_driver = {
+	.driver = {
+		.name = "cyapa",
+		.owner = THIS_MODULE,
+		.pm = &cyapa_pm_ops,
+	},
+
+	.probe = cyapa_probe,
+	.remove = __devexit_p(cyapa_remove),
+	.id_table = cyapa_id_table,
+};
+
+module_i2c_driver(cyapa_driver);
+
+MODULE_DESCRIPTION("Cypress APA I2C Trackpad Driver");
+MODULE_AUTHOR("Dudley Du ");
+MODULE_LICENSE("GPL");
-- 
1.7.7.3

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