Date:	Thu, 21 Aug 2014 11:21:02 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Dudley Du <dudley.dulixin@...il.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Benson Leung <bleung@...gle.com>,
	Patrik Fimml <patrikf@...gle.com>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, Dudley Du <dudl@...ress.com>
Subject: Re: [PATCH v4 1/14] input: cyapa: re-architecture driver to support
 multi-trackpads in one driver

On Thu, Jul 17, 2014 at 02:47:24PM +0800, Dudley Du wrote:
> In order to support two different communication protocol based trackpad
> device in one cyapa, the new cyapa driver is re-designed with
> one cyapa driver core and two devices' functions component.
> The cyapa driver core is contained in this patch, it supplies the basic
> function with input and kernel system and also defined the interfaces
> that the devices' functions component needs to apply and support.
> Also, in order to speed up the system boot time, the device states
> detecting and probing process is put into the async thread.
> TEST=test on Chromebooks.
> 
> Signed-off-by: Dudley Du <dudl@...ress.com>
> ---
>  drivers/input/mouse/Makefile |    4 +-
>  drivers/input/mouse/cyapa.c  | 1083 ++++++++++++++----------------------------
>  drivers/input/mouse/cyapa.h  |  275 +++++++++++
>  3 files changed, 646 insertions(+), 716 deletions(-)
>  create mode 100644 drivers/input/mouse/cyapa.h
> 
> diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
> index c25efdb..8608eb7 100644
> --- a/drivers/input/mouse/Makefile
> +++ b/drivers/input/mouse/Makefile
> @@ -8,7 +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_CYAPA)		+= cyapatp.o
>  obj-$(CONFIG_MOUSE_GPIO)		+= gpio_mouse.o
>  obj-$(CONFIG_MOUSE_INPORT)		+= inport.o
>  obj-$(CONFIG_MOUSE_LOGIBM)		+= logibm.o
> @@ -34,3 +34,5 @@ psmouse-$(CONFIG_MOUSE_PS2_SENTELIC)	+= sentelic.o
>  psmouse-$(CONFIG_MOUSE_PS2_TRACKPOINT)	+= trackpoint.o
>  psmouse-$(CONFIG_MOUSE_PS2_TOUCHKIT)	+= touchkit_ps2.o
>  psmouse-$(CONFIG_MOUSE_PS2_CYPRESS)	+= cypress_ps2.o
> +
> +cyapatp-y := cyapa.o
> diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
> index b409c3d..5fc8dbe 100644
> --- a/drivers/input/mouse/cyapa.c
> +++ b/drivers/input/mouse/cyapa.c
> @@ -6,7 +6,7 @@
>   *   Daniel Kurtz <djkurtz@...omium.org>
>   *   Benson Leung <bleung@...omium.org>
>   *
> - * Copyright (C) 2011-2012 Cypress Semiconductor, Inc.
> + * Copyright (C) 2011-2014 Cypress Semiconductor, Inc.
>   * Copyright (C) 2011-2012 Google, Inc.
>   *
>   * This file is subject to the terms and conditions of the GNU General Public
> @@ -14,731 +14,114 @@
>   * more details.
>   */
>  
> +#include <linux/debugfs.h>
>  #include <linux/delay.h>
>  #include <linux/i2c.h>
>  #include <linux/input.h>
>  #include <linux/input/mt.h>
>  #include <linux/interrupt.h>
>  #include <linux/module.h>
> +#include <linux/mutex.h>
>  #include <linux/slab.h>
> +#include <linux/uaccess.h>
> +#include <linux/pm_runtime.h>
> +#include "cyapa.h"
>  
> -/* APA trackpad firmware generation */
> -#define 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_CMD        0x04
> -#define CYAPA_CMD_GROUP_QUERY      0x05
> -#define CYAPA_CMD_BL_STATUS        0x06
> -#define CYAPA_CMD_BL_HEAD          0x07
> -#define CYAPA_CMD_BL_CMD           0x08
> -#define CYAPA_CMD_BL_DATA          0x09
> -#define CYAPA_CMD_BL_ALL           0x0a
> -#define CYAPA_CMD_BLK_PRODUCT_ID   0x0b
> -#define CYAPA_CMD_BLK_HEAD         0x0c
> -
> -/* 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 BL_STATUS_SIZE  3  /* length of bootloader status registers */
> -#define BLK_HEAD_BYTES 32
> -
> -#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_COMMAND_BASE  0x0028
> -#define REG_OFFSET_QUERY_BASE    0x002a
> -
> -#define CAPABILITY_LEFT_BTN_MASK	(0x01 << 3)
> -#define CAPABILITY_RIGHT_BTN_MASK	(0x01 << 4)
> -#define CAPABILITY_MIDDLE_BTN_MASK	(0x01 << 5)
> -#define CAPABILITY_BTN_MASK  (CAPABILITY_LEFT_BTN_MASK | \
> -			      CAPABILITY_RIGHT_BTN_MASK | \
> -			      CAPABILITY_MIDDLE_BTN_MASK)
> -
> -#define CYAPA_OFFSET_SOFT_RESET  REG_OFFSET_COMMAND_BASE
> -
> -#define REG_OFFSET_POWER_MODE (REG_OFFSET_COMMAND_BASE + 1)
> -
> -#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_OFF         (0x00 << 2)
> -
> -#define PWR_STATUS_MASK      0x0c
> -#define PWR_STATUS_ACTIVE    (0x03 << 2)
> -#define PWR_STATUS_IDLE      (0x02 << 2)
> -#define PWR_STATUS_OFF       (0x00 << 2)
> -
> -/*
> - * CYAPA trackpad device states.
> - * Used in register 0x00, bit1-0, DeviceStatus field.
> - * Other values indicate device is in an abnormal state and must be reset.
> - */
> -#define CYAPA_DEV_NORMAL  0x03
> -#define CYAPA_DEV_BUSY    0x01
> -
> -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_hi;
> -	u8 x_lo;  /* low 8 bits of x position value. */
> -	u8 y_lo;  /* 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
> -
> -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;
> -	/* CYAPA reports up to 5 touches per packet. */
> -	struct cyapa_touch touches[5];
> -} __packed;
> -
> -/* The main device structure */
> -struct cyapa {
> -	enum cyapa_state state;
> -
> -	struct i2c_client *client;
> -	struct input_dev *input;
> -	char phys[32];	/* device physical location */
> -	int irq;
> -	bool irq_wake;  /* irq wake is enabled */
> -	bool smbus;
> -
> -	/* read from query data region. */
> -	char product_id[16];
> -	u8 btn_capability;
> -	u8 gen;
> -	int max_abs_x;
> -	int max_abs_y;
> -	int physical_size_x;
> -	int physical_size_y;
> -};
> -
> -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 {
> -	u8 cmd;
> -	u8 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
>  
> -/*
> - * macros for SMBus communication
> - */
> -#define SMBUS_READ   0x01
> -#define SMBUS_WRITE 0x00
> -#define SMBUS_ENCODE_IDX(cmd, idx) ((cmd) | (((idx) & 0x03) << 1))
> -#define SMBUS_ENCODE_RW(cmd, rw) ((cmd) | ((rw) & 0x01))
> -#define SMBUS_BYTE_BLOCK_CMD_MASK 0x80
> -#define SMBUS_GROUP_BLOCK_CMD_MASK 0x40
> -
> - /* for byte read/write command */
> -#define CMD_RESET 0
> -#define CMD_POWER_MODE 1
> -#define CMD_DEV_STATUS 2
> -#define SMBUS_BYTE_CMD(cmd) (((cmd) & 0x3f) << 1)
> -#define CYAPA_SMBUS_RESET SMBUS_BYTE_CMD(CMD_RESET)
> -#define CYAPA_SMBUS_POWER_MODE SMBUS_BYTE_CMD(CMD_POWER_MODE)
> -#define CYAPA_SMBUS_DEV_STATUS SMBUS_BYTE_CMD(CMD_DEV_STATUS)
> -
> - /* for group registers read/write command */
> -#define REG_GROUP_DATA 0
> -#define REG_GROUP_CMD 2
> -#define REG_GROUP_QUERY 3
> -#define SMBUS_GROUP_CMD(grp) (0x80 | (((grp) & 0x07) << 3))
> -#define CYAPA_SMBUS_GROUP_DATA SMBUS_GROUP_CMD(REG_GROUP_DATA)
> -#define CYAPA_SMBUS_GROUP_CMD SMBUS_GROUP_CMD(REG_GROUP_CMD)
> -#define CYAPA_SMBUS_GROUP_QUERY SMBUS_GROUP_CMD(REG_GROUP_QUERY)
> -
> - /* for register block read/write command */
> -#define CMD_BL_STATUS 0
> -#define CMD_BL_HEAD 1
> -#define CMD_BL_CMD 2
> -#define CMD_BL_DATA 3
> -#define CMD_BL_ALL 4
> -#define CMD_BLK_PRODUCT_ID 5
> -#define CMD_BLK_HEAD 6
> -#define SMBUS_BLOCK_CMD(cmd) (0xc0 | (((cmd) & 0x1f) << 1))
> -
> -/* register block read/write command in bootloader mode */
> -#define CYAPA_SMBUS_BL_STATUS SMBUS_BLOCK_CMD(CMD_BL_STATUS)
> -#define CYAPA_SMBUS_BL_HEAD SMBUS_BLOCK_CMD(CMD_BL_HEAD)
> -#define CYAPA_SMBUS_BL_CMD SMBUS_BLOCK_CMD(CMD_BL_CMD)
> -#define CYAPA_SMBUS_BL_DATA SMBUS_BLOCK_CMD(CMD_BL_DATA)
> -#define CYAPA_SMBUS_BL_ALL SMBUS_BLOCK_CMD(CMD_BL_ALL)
> -
> -/* register block read/write command in operational mode */
> -#define CYAPA_SMBUS_BLK_PRODUCT_ID SMBUS_BLOCK_CMD(CMD_BLK_PRODUCT_ID)
> -#define CYAPA_SMBUS_BLK_HEAD SMBUS_BLOCK_CMD(CMD_BLK_HEAD)
> -
> -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_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_DEBUGFS_READ_FW	"read_fw"
> +#define CYAPA_DEBUGFS_RAW_DATA	"raw_data"
> +#define CYAPA_FW_NAME		"cyapa.bin"
> +
> +const char unique_str[] = "CYTRA";
> +
>  
> -static const struct cyapa_cmd_len cyapa_smbus_cmds[] = {
> -	{ CYAPA_SMBUS_RESET, 1 },
> -	{ CYAPA_SMBUS_POWER_MODE, 1 },
> -	{ CYAPA_SMBUS_DEV_STATUS, 1 },
> -	{ CYAPA_SMBUS_GROUP_DATA, sizeof(struct cyapa_reg_data) },
> -	{ CYAPA_SMBUS_GROUP_CMD, 2 },
> -	{ CYAPA_SMBUS_GROUP_QUERY, QUERY_DATA_SIZE },
> -	{ CYAPA_SMBUS_BL_STATUS, 3 },
> -	{ CYAPA_SMBUS_BL_HEAD, 16 },
> -	{ CYAPA_SMBUS_BL_CMD, 16 },
> -	{ CYAPA_SMBUS_BL_DATA, 16 },
> -	{ CYAPA_SMBUS_BL_ALL, 32 },
> -	{ CYAPA_SMBUS_BLK_PRODUCT_ID, PRODUCT_ID_SIZE },
> -	{ CYAPA_SMBUS_BLK_HEAD, 16 },
> -};
>  
> -static ssize_t cyapa_i2c_reg_read_block(struct cyapa *cyapa, u8 reg, size_t len,
> +ssize_t cyapa_i2c_reg_read_block(struct cyapa *cyapa, u8 reg, size_t len,
>  					u8 *values)
>  {
>  	return i2c_smbus_read_i2c_block_data(cyapa->client, reg, len, values);
>  }
>  
> -static ssize_t cyapa_i2c_reg_write_block(struct cyapa *cyapa, u8 reg,
> +ssize_t cyapa_i2c_reg_write_block(struct cyapa *cyapa, u8 reg,
>  					 size_t len, const u8 *values)
>  {
>  	return i2c_smbus_write_i2c_block_data(cyapa->client, reg, len, values);
>  }
>  
> -/*
> - * cyapa_smbus_read_block - perform smbus block read command
> - * @cyapa  - private data structure of the driver
> - * @cmd    - the properly encoded smbus command
> - * @len    - expected length of smbus command result
> - * @values - buffer to store smbus command result
> - *
> - * Returns negative errno, else the number of bytes written.
> - *
> - * Note:
> - * In trackpad device, the memory block allocated for I2C register map
> - * is 256 bytes, so the max read block for I2C bus is 256 bytes.
> - */
> -static ssize_t cyapa_smbus_read_block(struct cyapa *cyapa, u8 cmd, size_t len,
> -				      u8 *values)
> -{
> -	ssize_t ret;
> -	u8 index;
> -	u8 smbus_cmd;
> -	u8 *buf;
> -	struct i2c_client *client = cyapa->client;
> -
> -	if (!(SMBUS_BYTE_BLOCK_CMD_MASK & cmd))
> -		return -EINVAL;
> -
> -	if (SMBUS_GROUP_BLOCK_CMD_MASK & cmd) {
> -		/* read specific block registers command. */
> -		smbus_cmd = SMBUS_ENCODE_RW(cmd, SMBUS_READ);
> -		ret = i2c_smbus_read_block_data(client, smbus_cmd, values);
> -		goto out;
> -	}
> -
> -	ret = 0;
> -	for (index = 0; index * I2C_SMBUS_BLOCK_MAX < len; index++) {
> -		smbus_cmd = SMBUS_ENCODE_IDX(cmd, index);
> -		smbus_cmd = SMBUS_ENCODE_RW(smbus_cmd, SMBUS_READ);
> -		buf = values + I2C_SMBUS_BLOCK_MAX * index;
> -		ret = i2c_smbus_read_block_data(client, smbus_cmd, buf);
> -		if (ret < 0)
> -			goto out;
> -	}
> -
> -out:
> -	return ret > 0 ? len : ret;
> -}
> -
> -static s32 cyapa_read_byte(struct cyapa *cyapa, u8 cmd_idx)
> -{
> -	u8 cmd;
> -
> -	if (cyapa->smbus) {
> -		cmd = cyapa_smbus_cmds[cmd_idx].cmd;
> -		cmd = SMBUS_ENCODE_RW(cmd, SMBUS_READ);
> -	} else {
> -		cmd = cyapa_i2c_cmds[cmd_idx].cmd;
> -	}
> -	return i2c_smbus_read_byte_data(cyapa->client, cmd);
> -}
> -
> -static s32 cyapa_write_byte(struct cyapa *cyapa, u8 cmd_idx, u8 value)
> -{
> -	u8 cmd;
> -
> -	if (cyapa->smbus) {
> -		cmd = cyapa_smbus_cmds[cmd_idx].cmd;
> -		cmd = SMBUS_ENCODE_RW(cmd, SMBUS_WRITE);
> -	} else {
> -		cmd = cyapa_i2c_cmds[cmd_idx].cmd;
> -	}
> -	return i2c_smbus_write_byte_data(cyapa->client, cmd, value);
> -}
> -
> -static ssize_t cyapa_read_block(struct cyapa *cyapa, u8 cmd_idx, u8 *values)
> -{
> -	u8 cmd;
> -	size_t len;
> -
> -	if (cyapa->smbus) {
> -		cmd = cyapa_smbus_cmds[cmd_idx].cmd;
> -		len = cyapa_smbus_cmds[cmd_idx].len;
> -		return cyapa_smbus_read_block(cyapa, cmd, len, values);
> -	} else {
> -		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.
> - *
> - */
> -static int cyapa_get_state(struct cyapa *cyapa)
> +/* Returns 0 on success, else negative errno on failure. */
> +ssize_t cyapa_i2c_read(struct cyapa *cyapa, u8 reg, size_t len,
> +					u8 *values)
>  {
>  	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);
> -
> -	/*
> -	 * On smbus systems in OP mode, the i2c_reg_read will fail with
> -	 * -ETIMEDOUT.  In this case, try again using the smbus equivalent
> -	 * command.  This should return a BL_HEAD indicating CYAPA_STATE_OP.
> -	 */
> -	if (cyapa->smbus && (ret == -ETIMEDOUT || ret == -ENXIO))
> -		ret = cyapa_read_block(cyapa, CYAPA_CMD_BL_STATUS, status);
> -
> -	if (ret != BL_STATUS_SIZE)
> -		goto error;
> -
> -	if ((status[REG_OP_STATUS] & OP_STATUS_SRC) == OP_STATUS_SRC) {
> -		switch (status[REG_OP_STATUS] & OP_STATUS_DEV) {
> -		case CYAPA_DEV_NORMAL:
> -		case CYAPA_DEV_BUSY:
> -			cyapa->state = CYAPA_STATE_OP;
> -			break;
> -		default:
> -			ret = -EAGAIN;
> -			goto error;
> -		}
> -	} else {
> -		if (status[REG_BL_STATUS] & BL_STATUS_BUSY)
> -			cyapa->state = CYAPA_STATE_BL_BUSY;
> -		else if (status[REG_BL_ERROR] & BL_ERROR_BOOTLOADING)
> -			cyapa->state = CYAPA_STATE_BL_ACTIVE;
> -		else
> -			cyapa->state = CYAPA_STATE_BL_IDLE;
> -	}
> -
> -	return 0;
> -error:
> -	return (ret < 0) ? ret : -EAGAIN;
> +	struct i2c_client *client = cyapa->client;
> +	struct i2c_msg msgs[] = {
> +		{
> +			.addr = client->addr,
> +			.flags = 0,
> +			.len = 1,
> +			.buf = &reg,
> +		},
> +		{
> +			.addr = client->addr,
> +			.flags = I2C_M_RD,
> +			.len = len,
> +			.buf = values,
> +		},
> +	};
> +
> +	ret = i2c_transfer(client->adapter, msgs, 2);

You need to watch out for partial transfers. It should be:

	if (ret != ARRAY_SIZE(msgs))
		return ret < 0 ? ret : -EIO;

	return 0;

> +
> +	return ret < 0 ? ret : 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.
> - * However, when running a new firmware image, the device must calibrate its
> - * sensors, which can take as long as 2 seconds.
> +/**
> + * cyapa_i2c_write - Execute i2c block data write operation
> + * @cyapa: Handle to this driver
> + * @ret: Offset of the data to written in the register map
> + * @len: number of bytes to write
> + * @values: Data to be written
>   *
> - * Note: The timeout has granularity of the polling rate, which is 100 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
> + * Return negative errno code on error; return zero when success.
>   */
> -static int cyapa_poll_state(struct cyapa *cyapa, unsigned int timeout)
> +ssize_t cyapa_i2c_write(struct cyapa *cyapa, u8 reg,
> +					 size_t len, const void *values)
>  {
>  	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;
> -}
> +	struct i2c_client *client = cyapa->client;
> +	char data[32], *buf;
>  
> -static int cyapa_bl_deactivate(struct cyapa *cyapa)
> -{
> -	int ret;
> +	if (len > 31)
> +		buf = kzalloc(len + 1, GFP_KERNEL);
> +	else
> +		buf = data;
>  
> -	ret = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_deactivate),
> -					bl_deactivate);
> -	if (ret < 0)
> -		return ret;
> +	buf[0] = reg;
> +	memcpy(&buf[1], values, len);
> +	ret = i2c_master_send(client, buf, len + 1);
>  
> -	/* 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;
> +	if (buf != data)
> +		kfree(buf);
> +	return (ret == (len + 1)) ? 0 : ((ret < 0) ? ret : -EIO);
>  }
>  
> -/*
> - * Exit bootloader
> - *
> - * Send bl_exit command, then wait 50 - 100 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)
> +void cyapa_default_irq_handler(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.
> +	 * Do redetecting when device states is still unknown and
> +	 * interrupt envent is received from device.
>  	 */
> -	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
> - *
> - */
> -static int cyapa_set_power_mode(struct cyapa *cyapa, u8 power_mode)
> -{
> -	struct device *dev = &cyapa->client->dev;
> -	int ret;
> -	u8 power;
> -
> -	if (cyapa->state != CYAPA_STATE_OP)
> -		return 0;
> -
> -	ret = cyapa_read_byte(cyapa, CYAPA_CMD_POWER_MODE);
> -	if (ret < 0)
> -		return ret;
> -
> -	power = ret & ~PWR_MODE_MASK;
> -	power |= power_mode & PWR_MODE_MASK;
> -	ret = cyapa_write_byte(cyapa, CYAPA_CMD_POWER_MODE, power);
> -	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->btn_capability = query_data[19] & CAPABILITY_BTN_MASK;
> -
> -	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;
> +	async_schedule(cyapa_detect_async, cyapa);

I think I already asked this before - why do we need to try and schedule async
detect from interrupt handler. In what cases we will fail to initialize the
device during normal probing, but then are fine when stray interrupt arrives?

>  }
>  
> -/*
> - * 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;
> -	static 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) != 0) {
> -			dev_err(dev, "unsupported product ID (%s)\n",
> -				cyapa->product_id);
> -			return -EINVAL;
> -		}
> -		return 0;
> -
> -	default:
> -		return -EIO;
> -	}
> -	return 0;
> -}
> -
> -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;
> -
> -	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))
> -		goto out;
> -
> -	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) {
> -		goto out;
> -	}
> -
> -	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;
> -
> -		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_hi & 0xf0) << 4) | touch->x_lo);
> -		input_report_abs(input, ABS_MT_POSITION_Y,
> -				 ((touch->xy_hi & 0x0f) << 8) | touch->y_lo);
> -		input_report_abs(input, ABS_MT_PRESSURE, touch->pressure);
> -	}
> -
> -	input_mt_sync_frame(input);
> -
> -	if (cyapa->btn_capability & CAPABILITY_LEFT_BTN_MASK)
> -		input_report_key(input, BTN_LEFT,
> -				 data.finger_btn & OP_DATA_LEFT_BTN);
> -
> -	if (cyapa->btn_capability & CAPABILITY_MIDDLE_BTN_MASK)
> -		input_report_key(input, BTN_MIDDLE,
> -				 data.finger_btn & OP_DATA_MIDDLE_BTN);
> -
> -	if (cyapa->btn_capability & CAPABILITY_RIGHT_BTN_MASK)
> -		input_report_key(input, BTN_RIGHT,
> -				 data.finger_btn & OP_DATA_RIGHT_BTN);
> -
> -	input_sync(input);
> +const struct cyapa_dev_ops cyapa_default_ops = {
> +	.irq_handler = cyapa_default_irq_handler
> +};
>  
> -out:
> -	return IRQ_HANDLED;
> -}
>  
>  static u8 cyapa_check_adapter_functionality(struct i2c_client *client)
>  {
> @@ -772,19 +155,40 @@ static int cyapa_create_input_dev(struct cyapa *cyapa)
>  	input->phys = cyapa->phys;
>  	input->id.bustype = BUS_I2C;
>  	input->id.version = 1;
> -	input->id.product = 0;  /* means any product in eventcomm. */
> +	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);
>  
> -	/* finger position */
> +	/* 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);
> +	input_set_abs_params(input, ABS_MT_PRESSURE, 0, cyapa->max_z, 0, 0);
> +	if (cyapa->gen > CYAPA_GEN3) {
> +		input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
> +		input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
> +		/*
> +		 * Orientation is the angle between the vertical axis and
> +		 * the major axis of the contact ellipse.
> +		 * The range is -127 to 127.
> +		 * the positive direction is clockwise form the vertical axis.
> +		 * If the ellipse of contact degenerates into a circle,
> +		 * orientation is reported as 0.
> +		 *
> +		 * Also, for Gen5 trackpad the accurate of this orientation
> +		 * value is value + (-30 ~ 30).
> +		 */
> +		input_set_abs_params(input, ABS_MT_ORIENTATION,
> +				-127, 127, 0, 0);
> +	}
> +	if (cyapa->gen >= CYAPA_GEN5) {
> +		input_set_abs_params(input, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
> +		input_set_abs_params(input, ABS_MT_WIDTH_MINOR, 0, 255, 0, 0);
> +	}
>  
>  	input_abs_set_res(input, ABS_MT_POSITION_X,
>  			  cyapa->max_abs_x / cyapa->physical_size_x);
> @@ -801,7 +205,7 @@ static int cyapa_create_input_dev(struct cyapa *cyapa)
>  	if (cyapa->btn_capability == CAPABILITY_LEFT_BTN_MASK)
>  		__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
>  
> -	/* handle pointer emulation and unused slots in core */
> +	/* Handle pointer emulation and unused slots in core */
>  	ret = input_mt_init_slots(input, CYAPA_MAX_MT_SLOTS,
>  				  INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
>  	if (ret) {
> @@ -823,6 +227,224 @@ err_free_device:
>  	return ret;
>  }
>  
> +/*
> + * 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)
> +{
> +	int ret;
> +
> +	ret = cyapa_poll_state(cyapa, 4000);
> +	if (ret)
> +		return ret;
> +
> +	switch (cyapa->gen) {
> +	default:
> +		cyapa->ops = &cyapa_default_ops;
> +		cyapa->gen = CYAPA_GEN_UNKNOWN;
> +		break;
> +	}
> +
> +	if (cyapa->ops->operational_check)
> +		ret = cyapa->ops->operational_check(cyapa);
> +	else
> +		ret = -EBUSY;
> +
> +	return ret;
> +}
> +
> +
> +static irqreturn_t cyapa_irq(int irq, void *dev_id)
> +{
> +	struct cyapa *cyapa = dev_id;
> +	struct input_dev *input = cyapa->input;
> +	bool cont;
> +
> +	/* Interrupt event maybe cuased by host command to trackpad device. */
> +	cont = true;
> +	if (cyapa->ops->irq_cmd_handler)
> +		cont = cyapa->ops->irq_cmd_handler(cyapa);
> +
> +	/* Interrupt event maybe from trackpad device input reporting. */
> +	if (cont && cyapa->ops->irq_handler) {
> +		if (!mutex_trylock(&cyapa->state_sync_lock)) {
> +			if (cyapa->ops->sort_empty_output_data)
> +				cyapa->ops->sort_empty_output_data(cyapa,
> +					NULL, NULL, NULL);
> +			goto out;
> +		}
> +
> +		if (!input) {
> +			if (cyapa->ops->sort_empty_output_data)
> +				cyapa->ops->sort_empty_output_data(cyapa,
> +					NULL, NULL, NULL);
> +		} else
> +			cyapa->ops->irq_handler(cyapa);
> +
> +		mutex_unlock(&cyapa->state_sync_lock);
> +	}
> +out:
> +	return IRQ_HANDLED;
> +}
> +
> +/*
> + * Query device for its current operating state.
> + */
> +static int cyapa_get_state(struct cyapa *cyapa)
> +{
> +	cyapa->state = CYAPA_STATE_NO_DEVICE;
> +
> +	return -ENODEV;
> +}
> +
> +/*
> + * 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.
> + * However, 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 100 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
> + */
> +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;
> +}
> +
> +static void cyapa_detect(struct cyapa *cyapa)
> +{
> +	struct device *dev = &cyapa->client->dev;
> +	char *envp[2] = {"ERROR=1", NULL};
> +	int ret;
> +
> +	ret = cyapa_check_is_operational(cyapa);
> +	if (ret == -ETIMEDOUT)
> +		dev_err(dev, "no device detected, %d\n", ret);
> +	else if (ret)
> +		dev_err(dev, "device detected, but not operational, %d\n", ret);
> +
> +	if (ret) {
> +		kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
> +		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.
> +		 */
> +		if (cyapa->ops->set_power_mode) {
> +			ret = cyapa->ops->set_power_mode(cyapa,
> +					PWR_MODE_FULL_ACTIVE, 0);
> +			if (ret)
> +				dev_warn(dev, "set active power failed, %d\n",
> +						ret);
> +		}
> +	}
> +}
> +
> +/*
> + * Sysfs Interface.
> + */
> +
> +/*
> + * 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;
> + */
> +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. */

	clamp_val()

> +
> +	if (sleep_time < 100)
> +		return ((sleep_time / 10) << 2) & PWR_MODE_MASK;
> +	else
> +		return ((sleep_time / 20 + 5) << 2) & PWR_MODE_MASK;
> +}
> +
> +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;
> +}
> +
> +void cyapa_detect_async(void *data, async_cookie_t cookie)
> +{
> +	struct cyapa *cyapa = (struct cyapa *)data;
> +
> +	mutex_lock(&cyapa->state_sync_lock);
> +
> +	/* Keep synchronized with sys interface process threads. */
> +	cyapa_detect(cyapa);
> +
> +	mutex_unlock(&cyapa->state_sync_lock);
> +}
> +
> +static void cyapa_detect_and_start(void *data, async_cookie_t cookie)
> +{
> +	cyapa_detect_async(data, cookie);
> +}
> +
> +static int cyapa_tp_modules_init(struct cyapa *cyapa)
> +{
> +	return 0;
> +}
> +
> +static int cyapa_tp_modules_uninit(struct cyapa *cyapa)
> +{
> +	return 0;
> +}
> +
>  static int cyapa_probe(struct i2c_client *client,
>  		       const struct i2c_device_id *dev_id)
>  {
> @@ -830,6 +452,7 @@ static int cyapa_probe(struct i2c_client *client,
>  	u8 adapter_func;
>  	struct cyapa *cyapa;
>  	struct device *dev = &client->dev;
> +	union i2c_smbus_data dummy;
>  
>  	adapter_func = cyapa_check_adapter_functionality(client);
>  	if (adapter_func == CYAPA_ADAPTER_FUNC_NONE) {
> @@ -837,39 +460,43 @@ static int cyapa_probe(struct i2c_client *client,
>  		return -EIO;
>  	}
>  
> +	/* Make sure there is something at this address */
> +	if (dev->of_node && i2c_smbus_xfer(client->adapter, client->addr, 0,
> +			I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0)
> +		return -ENODEV;
> +
>  	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);
>  	sprintf(cyapa->phys, "i2c-%d-%04x/input0", client->adapter->nr,
>  		client->addr);
>  
> -	/* i2c isn't supported, use smbus */
> -	if (adapter_func == CYAPA_ADAPTER_FUNC_SMBUS)
> -		cyapa->smbus = true;
> -	cyapa->state = CYAPA_STATE_NO_DEVICE;
> -	ret = cyapa_check_is_operational(cyapa);
> +	ret = cyapa_tp_modules_init(cyapa);
>  	if (ret) {
> -		dev_err(dev, "device not operational, %d\n", ret);
> -		goto err_mem_free;
> +		dev_err(dev, "initialize device modules failed.\n");
> +		goto err_unregister_device;
>  	}
>  
> -	ret = cyapa_create_input_dev(cyapa);
> -	if (ret) {
> -		dev_err(dev, "create input_dev instance failed, %d\n", ret);
> -		goto err_mem_free;
> -	}
> +	cyapa->gen = CYAPA_GEN_UNKNOWN;
> +	cyapa->ops = &cyapa_default_ops;
> +	mutex_init(&cyapa->state_sync_lock);
>  
> -	ret = cyapa_set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE);
> -	if (ret) {
> -		dev_err(dev, "set active power failed, %d\n", ret);
> -		goto err_unregister_device;
> -	}
> +	/* i2c isn't supported, use smbus */
> +	if (adapter_func == CYAPA_ADAPTER_FUNC_SMBUS)
> +		cyapa->smbus = true;
> +	cyapa->state = CYAPA_STATE_NO_DEVICE;
> +	/*
> +	 * Set to hard code default, they will be updated with trackpad set
> +	 * default values after probe and initialized.
> +	 */
> +	cyapa->suspend_power_mode = PWR_MODE_SLEEP;
> +	cyapa->suspend_sleep_time =
> +		cyapa_pwr_cmd_to_sleep_time(cyapa->suspend_power_mode);
>  
>  	cyapa->irq = client->irq;
>  	ret = request_threaded_irq(cyapa->irq,
> @@ -880,14 +507,17 @@ static int cyapa_probe(struct i2c_client *client,
>  				   cyapa);
>  	if (ret) {
>  		dev_err(dev, "IRQ request failed: %d\n, ", ret);
> -		goto err_unregister_device;
> +		goto err_uninit_tp_modules;
>  	}
>  
> +	async_schedule(cyapa_detect_and_start, cyapa);
>  	return 0;
>  
> +err_uninit_tp_modules:
> +	cyapa_tp_modules_uninit(cyapa);
>  err_unregister_device:
>  	input_unregister_device(cyapa->input);
> -err_mem_free:
> +	i2c_set_clientdata(client, NULL);
>  	kfree(cyapa);
>  
>  	return ret;
> @@ -898,8 +528,12 @@ static int cyapa_remove(struct i2c_client *client)
>  	struct cyapa *cyapa = i2c_get_clientdata(client);
>  

You schedule detect asynchronously so you need to make sure it is not running
(and will not be running) when you try to unbind the driver here.

Thanks.


-- 
Dmitry
--
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