Input: add support for HiDeep touchscreen

The HiDeep touchscreen device is a capacitive multi-touch controller
mainly for multi-touch supported devices use. It use I2C interface for
communication to IC and provide axis X, Y, Z locations for ten finger
touch through input event interface to userspace.

It support the Crimson and the Lime two type IC. They are different
the number of channel supported and FW size. But the working protocol
is same.

Signed-off-by: Anthony Kim <anthony.kim@hideep.com>
---
 .../bindings/input/touchscreen/hideep.txt          |   42 +
 .../devicetree/bindings/vendor-prefixes.txt        |    1 +
 drivers/input/touchscreen/Kconfig                  |   11 +
 drivers/input/touchscreen/Makefile                 |    1 +
 drivers/input/touchscreen/hideep.c                 | 1274 ++++++++++++++++++++
 5 files changed, 1329 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/hideep.txt
 create mode 100644 drivers/input/touchscreen/hideep.c

Hi Anthony,

On Thu, Sep 14, 2017 at 01:36:44PM +0900, Anthony Kim wrote:
> The HiDeep touchscreen device is a capacitive multi-touch controller
> mainly for multi-touch supported devices use. It use I2C interface for
> communication to IC and provide axis X, Y, Z locations for ten finger
> touch through input event interface to userspace.
> 
> It support the Crimson and the Lime two type IC. They are different
> the number of channel supported and FW size. But the working protocol
> is same.
> 
> Signed-off-by: Anthony Kim <anthony.kim@hideep.com>

Thank you for making the changes, The driver is shaping up, however
there are still a few issues (below). Also:

- please install and run tool "sparse" on the driver (you can invoke it
  via "make C=2 drivers/input/touchscreen/hideep.o") - there are a few
  endianness issues that it will show.

- try using regmap for accessing the device, I think it will work well
  here.

- there is error handling is missing in quite a few places.

> ---
>  .../bindings/input/touchscreen/hideep.txt          |   42 +
>  .../devicetree/bindings/vendor-prefixes.txt        |    1 +
>  drivers/input/touchscreen/Kconfig                  |   11 +
>  drivers/input/touchscreen/Makefile                 |    1 +
>  drivers/input/touchscreen/hideep.c                 | 1274 ++++++++++++++++++++
>  5 files changed, 1329 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/touchscreen/hideep.txt
>  create mode 100644 drivers/input/touchscreen/hideep.c
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/hideep.txt b/Documentation/devicetree/bindings/input/touchscreen/hideep.txt
> new file mode 100644
> index 0000000..86b3a97
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/hideep.txt
> @@ -0,0 +1,42 @@
> +* HiDeep Finger and Stylus touchscreen controller
> +
> +Required properties:
> +- compatible		: must be "hideep,hideep-ts"
> +- reg			: I2C slave address, (e.g. 0x6C).
> +- interrupt-parent : Interrupt controller to which the chip is connected.
> +- interrupts : Interrupt to which the chip is connected.
> +
> +Optional properties:
> +- vdd-supply	: It is the controller supply for controlling
> +					 main voltage(3.3V) through the regulator.
> +- vid-supply	: It is the controller supply for controlling
> +					IO voltage(1.8V) through the regulator.
> +- reset-gpios	: Define for reset gpio pin.
> +						It is to use for reset IC.
> +- touchscreen-size-x	: X axis size of touchscreen
> +- touchscreen-size-y	: Y axis size of touchscreen
> +- linux,keycodes	: Specifies an array of numeric keycode values to
> +			be used for reporting button presses. The array can
> +			contain up to 3 entries.
> +
> +Example:
> +
> +#include "dt-bindings/input/input.h"
> +
> +i2c@00000000 {
> +
> +	/* ... */
> +
> +	touchscreen@6c {
> +		compatible = "hideep,hideep-ts";
> +		reg = <0x6c>;
> +		interrupt-parent = <&gpx1>;
> +		interrupts = <2 IRQ_TYPE_LEVEL_LOW>;
> +		vdd-supply = <&ldo15_reg>";
> +		vid-supply = <&ldo18_reg>;
> +		reset-gpios = <&gpx1 5 0>;
> +		touchscreen-size-x = 1079;
> +		touchscreen-size-y = 1919;
> +		linux,keycodes = <KEY_HOME>, <KEY_MENU>, <KEY_BACK>;
> +	};
> +};
> diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
> index c03d201..aa2a301 100644
> --- a/Documentation/devicetree/bindings/vendor-prefixes.txt
> +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
> @@ -131,6 +131,7 @@ gw	Gateworks Corporation
>  hannstar	HannStar Display Corporation
>  haoyu	Haoyu Microelectronic Co. Ltd.
>  hardkernel	Hardkernel Co., Ltd
> +hideep	HiDeep Inc.
>  himax	Himax Technologies, Inc.
>  hisilicon	Hisilicon Limited.
>  hit	Hitachi Ltd.
> diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
> index 64b30fe..d0c8dafc 100644
> --- a/drivers/input/touchscreen/Kconfig
> +++ b/drivers/input/touchscreen/Kconfig
> @@ -344,6 +344,17 @@ config TOUCHSCREEN_GOODIX
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called goodix.
>  
> +config TOUCHSCREEN_HIDEEP
> +	tristate "HiDeep Touch IC"
> +	depends on I2C
> +	help
> +	  Say Y here if you have a touchscreen using HiDeep.
> +
> +	  If unsure, say N.
> +
> +	  To compile this driver as a moudle, choose M here : the
> +	  module will be called hideep_ts.
> +
>  config TOUCHSCREEN_ILI210X
>  	tristate "Ilitek ILI210X based touchscreen"
>  	depends on I2C
> diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
> index 6badce8..873b67e 100644
> --- a/drivers/input/touchscreen/Makefile
> +++ b/drivers/input/touchscreen/Makefile
> @@ -39,6 +39,7 @@ obj-$(CONFIG_TOUCHSCREEN_EGALAX)	+= egalax_ts.o
>  obj-$(CONFIG_TOUCHSCREEN_EGALAX_SERIAL)	+= egalax_ts_serial.o
>  obj-$(CONFIG_TOUCHSCREEN_FUJITSU)	+= fujitsu_ts.o
>  obj-$(CONFIG_TOUCHSCREEN_GOODIX)	+= goodix.o
> +obj-$(CONFIG_TOUCHSCREEN_HIDEEP)	+= hideep.o
>  obj-$(CONFIG_TOUCHSCREEN_ILI210X)	+= ili210x.o
>  obj-$(CONFIG_TOUCHSCREEN_IMX6UL_TSC)	+= imx6ul_tsc.o
>  obj-$(CONFIG_TOUCHSCREEN_INEXIO)	+= inexio.o
> diff --git a/drivers/input/touchscreen/hideep.c b/drivers/input/touchscreen/hideep.c
> new file mode 100644
> index 0000000..f1b021b
> --- /dev/null
> +++ b/drivers/input/touchscreen/hideep.c
> @@ -0,0 +1,1274 @@
> +/*
> + * Copyright (C) 2012-2017 Hideep, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foudation.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/firmware.h>
> +#include <linux/delay.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/gpio.h>
> +#include <linux/i2c.h>
> +#include <linux/acpi.h>
> +#include <linux/interrupt.h>
> +#include <linux/sysfs.h>
> +#include <linux/input.h>
> +#include <linux/input/mt.h>
> +#include <linux/input/touchscreen.h>
> +#include <asm/unaligned.h>
> +
> +#define HIDEEP_TS_NAME					"HiDeep Touchscreen"
> +#define HIDEEP_I2C_NAME					"hideep_ts"
> +
> +#define HIDEEP_MT_MAX					10
> +#define HIDEEP_KEY_MAX					3
> +#define FRAME_HEADER_SIZE				8
> +
> +/* Touch & key event */
> +#define HIDEEP_EVENT_COUNT_ADDR			0x240
> +#define HIDEEP_TOUCH_DATA_ADDR			0x242
> +#define HIDEEP_KEY_DATA_ADDR			0x2A6
> +#define HIDEEP_RAW_DATA_ADDR			0x1000

Can we try aligning defines consistently? When using "standard" 8
poisitons tabs the values are not quite lining up.

> +
> +/* command list */
> +#define HIDEEP_RESET_CMD				0x9800
> +#define HIDEEP_INTCLR_CMD				0x9802
> +#define HIDEEP_OPMODE_CMD				0x9804
> +#define HIDEEP_SWTICH_CMD				0x9805
> +#define HIDEEP_SLEEP_CMD				0x980D
> +
> +/* multi touch event bit */
> +#define HIDEEP_MT_ALWAYS_REPORT			0
> +#define HIDEEP_MT_TOUCHED				1
> +#define HIDEEP_MT_FIRST_CONTACT			2
> +#define HIDEEP_MT_DRAG_MOVE				3
> +#define HIDEEP_MT_RELEASED				4
> +#define HIDEEP_MT_PINCH					5
> +#define HIDEEP_MT_PRESSURE				6

Please use BIT() for these.

> +
> +/* key event bit */
> +#define HIDEEP_KEY_RELEASED				0x20
> +#define HIDEEP_KEY_PRESSED				0x40
> +#define HIDEEP_KEY_FIRST_PRESSED		0x80

These seem to be BIT()s as well.

> +#define HIDEEP_KEY_PRESSED_MASK			0xC0

Is this (KEY_PRESSED | KEY_FIRST_PRESSED) ?

> +
> +/* For NVM */
> +#define YRAM_BASE				0x40000000
> +#define PERIPHERAL_BASE			0x50000000
> +#define ESI_BASE				(PERIPHERAL_BASE + 0x00000000)
> +#define FLASH_BASE				(PERIPHERAL_BASE + 0x01000000)
> +#define SYSCON_BASE				(PERIPHERAL_BASE + 0x02000000)
> +
> +#define SYSCON_MOD_CON			(SYSCON_BASE + 0x0000)
> +#define SYSCON_SPC_CON			(SYSCON_BASE + 0x0004)
> +#define SYSCON_CLK_CON			(SYSCON_BASE + 0x0008)
> +#define SYSCON_CLK_ENA			(SYSCON_BASE + 0x000C)
> +#define SYSCON_RST_CON			(SYSCON_BASE + 0x0010)
> +#define SYSCON_WDT_CON			(SYSCON_BASE + 0x0014)
> +#define SYSCON_WDT_CNT			(SYSCON_BASE + 0x0018)
> +#define SYSCON_PWR_CON			(SYSCON_BASE + 0x0020)
> +#define SYSCON_PGM_ID			(SYSCON_BASE + 0x00F4)
> +
> +#define FLASH_CON				(FLASH_BASE + 0x0000)
> +#define FLASH_STA				(FLASH_BASE + 0x0004)
> +#define FLASH_CFG				(FLASH_BASE + 0x0008)
> +#define FLASH_TIM				(FLASH_BASE + 0x000C)
> +#define FLASH_CACHE_CFG			(FLASH_BASE + 0x0010)
> +#define FLASH_PIO_SIG			(FLASH_BASE + 0x400000)
> +
> +#define ESI_TX_INVALID			(ESI_BASE + 0x0008)
> +
> +#define PERASE					0x00040000
> +#define WRONLY					0x00100000
> +
> +#define NVM_MASK_OFS			0x0000000C
> +#define NVM_DEFAULT_PAGE		0
> +#define NVM_SFR_WPAGE			1
> +#define NVM_SFR_RPAGE			2
> +
> +#define PIO_SIG					0x00400000
> +#define _PROT_MODE				0x03400000
> +
> +#define NVM_PAGE_SIZE			128

Maybe use HIDEEP_ prefix for all of the above defines too?

> +
> +#define HIDEEP_DWZ_INFO			0x000002C0
> +
> +enum e_dev_state {
> +	state_init = 1,
> +	state_normal,
> +	state_sleep,
> +	state_updating,
> +};

I do not understand why this enum is needed. You only check it in IRQ to
see if you are in normal mode, but usually you disable interrupt before
carrying out various actions, so IRQ will not even fire when the device
is not on normal mode...

> +
> +struct hideep_event {
> +	__le16 x;
> +	__le16 y;
> +	__le16 z;
> +	unsigned char w;
> +	unsigned char flag;
> +	unsigned char type;
> +	unsigned char index;

Use u8 type for byte data.

> +} __packed;
> +
> +struct dwz_info {
> +	__le32	code_start;
> +	unsigned char code_crc[12];

	u8

> +
> +	__le32 c_code_start;
> +	__le16 c_code_len;
> +	__le16 gen_ver;
> +
> +	__le32 vr_start;
> +	__le16 vr_len;
> +	__le16 rsv0;
> +
> +	__le32 ft_start;
> +	__le16 ft_len;
> +	__le16 vr_version;
> +
> +	__le16 boot_ver;
> +	__le16 core_ver;
> +	__le16 custom_ver;
> +	__le16 release_ver;
> +
> +	unsigned char factory_id;
> +	unsigned char panel_type;
> +	unsigned char model_name[6];

u8 for the above 3.

> +	__le16 product_code;
> +	__le16 extra_option;
> +
> +	__le16 product_id;
> +	__le16 vendor_id;
> +} __packed;
> +
> +struct hideep_ts {
> +	struct i2c_client *client;
> +	struct input_dev *input_dev;
> +
> +	struct touchscreen_properties prop;
> +
> +	struct gpio_desc *reset_gpio;
> +
> +	struct regulator *vcc_vdd;
> +	struct regulator *vcc_vid;
> +
> +	struct mutex dev_mutex;
> +	struct mutex i2c_mutex;
> +
> +	enum e_dev_state dev_state;
> +
> +	unsigned int tch_count;
> +	unsigned int key_count;
> +	unsigned int lpm_count;
> +
> +	unsigned char touch_event[HIDEEP_MT_MAX * 10];
> +	unsigned char key_event[HIDEEP_KEY_MAX * 2];
> +
> +	int key_num;
> +	int key_codes[HIDEEP_KEY_MAX];
> +
> +	struct dwz_info dwz_info;
> +
> +	int fw_size;
> +	int nvm_mask;
> +} __packed;

THis structure does not need to be backed.

> +
> +struct pgm_packet {
> +	union {
> +		unsigned char b[8];
> +		__be32 w[2];
> +	} header;
> +
> +	__be32 payload[NVM_PAGE_SIZE / sizeof(unsigned int)];
> +};
> +
> +static void hideep_reset_ic(struct hideep_ts *ts);
> +
> +static int hideep_pgm_w_mem(struct hideep_ts *ts, unsigned int addr,
> +	struct pgm_packet *packet, unsigned int len)
> +{
> +	int ret;
> +	int i;
> +
> +	if ((len % sizeof(u32)) != 0)
> +		return -EINVAL;
> +
> +	put_unaligned_be32((0x80 | (len / sizeof(u32) - 1)),
> +		&packet->header.w[0]);
> +	put_unaligned_be32(addr, &packet->header.w[1]);
> +
> +	for (i = 0; i < len / sizeof(u32); i++)
> +		put_unaligned_be32(packet->payload[i], &packet->payload[i]);
> +
> +	ret = i2c_master_send(ts->client, &packet->header.b[3],
> +		(len + 5));
> +
> +	return ret;
> +}
> +
> +static int hideep_pgm_r_mem(struct hideep_ts *ts, unsigned int addr,
> +	struct pgm_packet *packet, unsigned int len)
> +{
> +	int ret;
> +	int i;
> +	unsigned char buff[len];	// need to modify
> +	struct i2c_msg msg[2];
> +
> +	if ((len % sizeof(u32)) != 0)
> +		return -EINVAL;
> +
> +	put_unaligned_be32((0x00 | (len / sizeof(u32) - 1)),
> +		&packet->header.w[0]);
> +	put_unaligned_be32(addr, &packet->header.w[1]);
> +
> +	msg[0].addr = ts->client->addr;
> +	msg[0].flags = 0;
> +	msg[0].len = 5;
> +	msg[0].buf = &packet->header.b[3];
> +
> +	msg[1].addr = ts->client->addr;
> +	msg[1].flags = I2C_M_RD;
> +	msg[1].len = len;
> +	msg[1].buf = buff;
> +
> +	ret = i2c_transfer(ts->client->adapter, msg, 2);
> +
> +	if (ret < 0)
> +		goto err;
> +
> +	for (i = 0; i < len / sizeof(u32); i++)
> +		packet->payload[i] = get_unaligned_be32(&buff[i * sizeof(u32)]);
> +
> +err:
> +	return ret;
> +}
> +
> +static int hideep_pgm_r_reg(struct hideep_ts *ts, unsigned int addr,
> +	unsigned int *val)
> +{
> +	int ret;
> +	struct pgm_packet packet;
> +
> +	put_unaligned_be32(0x00, &packet.header.w[0]);
> +	put_unaligned_be32(addr, &packet.header.w[1]);
> +
> +	ret = hideep_pgm_r_mem(ts, addr, &packet, sizeof(u32));
> +
> +	if (ret < 0)
> +		goto err;
> +
> +	*val = packet.payload[0];
> +
> +err:
> +	return ret;
> +}
> +
> +static int hideep_pgm_w_reg(struct hideep_ts *ts, unsigned int addr,
> +	unsigned int data)
> +{
> +	int ret;
> +	struct pgm_packet packet;
> +
> +	put_unaligned_be32(0x80, &packet.header.w[0]);
> +	put_unaligned_be32(addr, &packet.header.w[1]);
> +	packet.payload[0] = data;
> +
> +	ret = hideep_pgm_w_mem(ts, addr, &packet, sizeof(u32));
> +
> +	return ret;
> +}
> +
> +#define SW_RESET_IN_PGM(CLK) \
> +{ \
> +	hideep_pgm_w_reg(ts, SYSCON_WDT_CNT, CLK); \
> +	hideep_pgm_w_reg(ts, SYSCON_WDT_CON, 0x03); \
> +	hideep_pgm_w_reg(ts, SYSCON_WDT_CON, 0x01); \
> +}
> +
> +#define SET_FLASH_PIO(CE) \
> +	hideep_pgm_w_reg(ts, FLASH_CON, 0x01 | (CE << 1))
> +#define SET_PIO_SIG(X, Y) \
> +	hideep_pgm_w_reg(ts, FLASH_PIO_SIG + X, Y)
> +#define SET_FLASH_HWCONTROL() \
> +	hideep_pgm_w_reg(ts, FLASH_CON, 0x00)
> +
> +#define NVM_W_SFR(x, y) \
> +{ \
> +	SET_FLASH_PIO(1); \
> +	SET_PIO_SIG(x, y); \
> +	SET_FLASH_PIO(0); \
> +}
> +
> +static void hideep_pgm_set(struct hideep_ts *ts)
> +{
> +	hideep_pgm_w_reg(ts, SYSCON_WDT_CON, 0x00);
> +	hideep_pgm_w_reg(ts, SYSCON_SPC_CON, 0x00);
> +	hideep_pgm_w_reg(ts, SYSCON_CLK_ENA, 0xFF);
> +	hideep_pgm_w_reg(ts, SYSCON_CLK_CON, 0x01);
> +	hideep_pgm_w_reg(ts, SYSCON_PWR_CON, 0x01);
> +	hideep_pgm_w_reg(ts, FLASH_TIM, 0x03);
> +	hideep_pgm_w_reg(ts, FLASH_CACHE_CFG, 0x00);
> +}
> +
> +static int hideep_pgm_get_pattern(struct hideep_ts *ts)
> +{
> +	int ret;
> +	unsigned int status;
> +	const unsigned char pattern[] = { 0x39, 0xAF, 0x9D, 0xDF };
> +
> +	ret = i2c_master_send(ts->client, pattern, sizeof(pattern));
> +
> +	if (ret < 0) {
> +		dev_err(&ts->client->dev, "%d, %08X", __LINE__, ret);
> +		return ret;
> +	}
> +
> +	mdelay(1);
> +
> +	/* flush invalid Tx load register */
> +	ret = hideep_pgm_w_reg(ts, ESI_TX_INVALID, 0x01);
> +
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = hideep_pgm_r_reg(ts, SYSCON_PGM_ID, &status);
> +
> +	if (ret < 0)
> +		return ret;
> +
> +	dev_info(&ts->client->dev, "%s, %08X", __func__, status);
> +	return status;
> +}
> +
> +static int hideep_enter_pgm(struct hideep_ts *ts)
> +{
> +	int retry_count = 10;
> +	int val;
> +	unsigned int pgm_pattern = 0xDF9DAF39;
> +
> +	while (retry_count--) {
> +		val = hideep_pgm_get_pattern(ts);
> +
> +		if (pgm_pattern != get_unaligned_be32(&val)) {
> +			dev_err(&ts->client->dev, "enter_pgm : error(%08x):",
> +				get_unaligned_be32(&val));
> +		} else {
> +			dev_dbg(&ts->client->dev, "found magic code");
> +			break;
> +		}
> +	}
> +
> +
> +	if (retry_count < 0) {
> +		dev_err(&ts->client->dev, "couldn't enter pgm mode!!!");
> +		SW_RESET_IN_PGM(1000);
> +		return -EBADMSG;
> +	}
> +
> +	hideep_pgm_set(ts);
> +	mdelay(1);
> +
> +	return 0;
> +}
> +
> +static void hideep_nvm_unlock(struct hideep_ts *ts)
> +{
> +	unsigned int unmask_code = 0;
> +
> +	hideep_pgm_w_reg(ts, FLASH_CFG, NVM_SFR_RPAGE);
> +
> +	hideep_pgm_r_reg(ts, 0x0000000C, &unmask_code);
> +
> +	hideep_pgm_w_reg(ts, FLASH_CFG, NVM_DEFAULT_PAGE);
> +
> +	/* make it unprotected code */
> +	unmask_code &= (~_PROT_MODE);
> +
> +	/* compare unmask code */
> +	if (unmask_code != ts->nvm_mask)
> +		dev_dbg(&ts->client->dev, "read mask code different 0x%x",
> +			unmask_code);
> +
> +	hideep_pgm_w_reg(ts, FLASH_CFG, NVM_SFR_WPAGE);
> +	SET_FLASH_PIO(0);
> +
> +	NVM_W_SFR(NVM_MASK_OFS, ts->nvm_mask);
> +	SET_FLASH_HWCONTROL();
> +	hideep_pgm_w_reg(ts, FLASH_CFG, NVM_DEFAULT_PAGE);
> +}
> +
> +static int hideep_check_status(struct hideep_ts *ts)
> +{
> +	int ret, status;
> +	int time_out = 100;
> +
> +	while (time_out--) {
> +		mdelay(1);
> +		ret = hideep_pgm_r_reg(ts, FLASH_STA, &status);
> +
> +		if (ret < 0)
> +			continue;
> +
> +		if (status)
> +			return status;
> +	}
> +
> +	return time_out;
> +}
> +
> +static int hideep_program_page(struct hideep_ts *ts,
> +	unsigned int addr, struct pgm_packet *packet_w)
> +{
> +	int ret;
> +
> +
> +	ret = hideep_check_status(ts);
> +
> +	if (ret < 0)
> +		return -EBUSY;
> +
> +	addr = addr & ~(NVM_PAGE_SIZE - 1);
> +
> +	SET_FLASH_PIO(0);
> +	SET_FLASH_PIO(1);
> +
> +	/* erase page */
> +	SET_PIO_SIG((PERASE | addr), 0xFFFFFFFF);
> +
> +	SET_FLASH_PIO(0);
> +
> +	ret = hideep_check_status(ts);
> +
> +	if (ret < 0)
> +		return -EBUSY;
> +
> +	/* write page */
> +	SET_FLASH_PIO(1);
> +
> +	SET_PIO_SIG((WRONLY | addr), get_unaligned_be32(&packet_w->payload[0]));
> +
> +	hideep_pgm_w_mem(ts, (FLASH_PIO_SIG | WRONLY),
> +		packet_w, NVM_PAGE_SIZE);
> +
> +	SET_PIO_SIG(124, get_unaligned_be32(&packet_w->payload[31]));
> +
> +	SET_FLASH_PIO(0);
> +
> +	mdelay(1);
> +
> +	ret = hideep_check_status(ts);
> +
> +	if (ret < 0)
> +		return -EBUSY;
> +
> +	SET_FLASH_HWCONTROL();
> +
> +	return 0;
> +}
> +
> +static void hideep_program_nvm(struct hideep_ts *ts, const unsigned char *ucode,
> +	int len)
> +{
> +	struct pgm_packet packet_w;
> +	struct pgm_packet packet_r;
> +	int i;
> +	int ret;
> +	int addr = 0;
> +	int len_r = len;
> +	int len_w = NVM_PAGE_SIZE;
> +	unsigned int pages = DIV_ROUND_UP(len, NVM_PAGE_SIZE);
> +
> +
> +	hideep_nvm_unlock(ts);
> +
> +	dev_dbg(&ts->client->dev, "pages : %d", pages);
> +
> +	for (i = 0; i < pages; i++) {
> +		if (len_r < NVM_PAGE_SIZE)
> +			len_w = len_r;
> +
> +		/* compare */
> +		hideep_pgm_r_mem(ts, 0x00000000 + addr, &packet_r,
> +			NVM_PAGE_SIZE);
> +		ret = memcmp(&ucode[addr], packet_r.payload, len_w);
> +
> +		if (ret) {
> +			/* write page */
> +			memcpy(packet_w.payload, &ucode[addr], len_w);
> +			ret = hideep_program_page(ts, addr, &packet_w);
> +			if (ret)
> +				dev_err(&ts->client->dev,
> +					"%s : error(%08x):",
> +					__func__, addr);
> +			mdelay(1);
> +		}
> +
> +		addr += NVM_PAGE_SIZE;
> +		len_r -= NVM_PAGE_SIZE;
> +		if (len_r < 0)
> +			break;
> +	}
> +}
> +
> +static int hideep_verify_nvm(struct hideep_ts *ts, const unsigned char *ucode,
> +	int len)
> +{
> +	struct pgm_packet packet_r;
> +	int i, j;
> +	int ret;
> +	int addr = 0;
> +	int len_r = len;
> +	int len_v = NVM_PAGE_SIZE;
> +	unsigned int pages = DIV_ROUND_UP(len, NVM_PAGE_SIZE);
> +
> +	for (i = 0; i < pages; i++) {
> +		if (len_r < NVM_PAGE_SIZE)
> +			len_v = len_r;
> +
> +		hideep_pgm_r_mem(ts, 0x00000000 + addr, &packet_r,
> +			NVM_PAGE_SIZE);
> +
> +		ret = memcmp(&ucode[addr], packet_r.payload, len_v);
> +
> +		if (ret) {
> +			u8 *read = (u8 *)packet_r.payload;
> +
> +			for (j = 0; j < NVM_PAGE_SIZE; j++) {
> +				if (ucode[addr + j] != read[j])
> +					dev_err(&ts->client->dev,
> +						"verify : error([%d] %02x : %02x)",
> +						addr + j, ucode[addr + j],
> +						read[j]);
> +			}
> +			return ret;
> +		}
> +
> +		addr += NVM_PAGE_SIZE;
> +		len_r -= NVM_PAGE_SIZE;
> +		if (len_r < 0)
> +			break;
> +	}
> +
> +	return 0;
> +}
> +
> +static int hideep_update_firmware(struct hideep_ts *ts, const char *fn)
> +{
> +	int ret;
> +	int retry, retry_cnt = 3;
> +	const struct firmware *fw_entry;
> +
> +	dev_dbg(&ts->client->dev, "enter");
> +	ret = request_firmware(&fw_entry, fn, &ts->client->dev);
> +
> +	if (ret != 0) {
> +		dev_err(&ts->client->dev, "request_firmware : fail(%d)", ret);
> +		return ret;
> +	}
> +
> +	if (fw_entry->size > ts->fw_size) {
> +		dev_err(&ts->client->dev,
> +			"file size(%zu) is big more than fw memory size(%d)",
> +			fw_entry->size, ts->fw_size);
> +		release_firmware(fw_entry);
> +		return -EFBIG;
> +	}
> +
> +	/* chip specific code for flash fuse */
> +	mutex_lock(&ts->dev_mutex);
> +
> +	ts->dev_state = state_updating;
> +
> +	/* enter program mode */
> +	ret = hideep_enter_pgm(ts);
> +
> +	if (ret)
> +		return ret;
> +
> +	/* comparing & programming each page, if the memory of specified
> +	 * page is exactly same, no need to update.
> +	 */
> +	for (retry = 0; retry < retry_cnt; retry++) {
> +		hideep_program_nvm(ts, fw_entry->data, fw_entry->size);
> +
> +		ret = hideep_verify_nvm(ts, fw_entry->data, fw_entry->size);
> +		if (!ret)
> +			break;
> +	}
> +
> +	if (retry < retry_cnt)
> +		dev_dbg(&ts->client->dev, "update success!!!");
> +	else
> +		dev_err(&ts->client->dev, "update failed!!!");
> +
> +	SW_RESET_IN_PGM(1000);
> +
> +	ts->dev_state = state_normal;
> +
> +	mutex_unlock(&ts->dev_mutex);
> +
> +	release_firmware(fw_entry);
> +
> +	return ret;
> +}
> +
> +static int hideep_load_dwz(struct hideep_ts *ts)
> +{
> +	int ret = 0;
> +	struct pgm_packet packet_r;
> +
> +	ret = hideep_enter_pgm(ts);
> +
> +	if (ret)
> +		return ret;
> +
> +	mdelay(50);
> +
> +	hideep_pgm_r_mem(ts, HIDEEP_DWZ_INFO, &packet_r,
> +		sizeof(struct dwz_info));
> +
> +	memcpy(&ts->dwz_info, packet_r.payload,
> +		sizeof(struct dwz_info));
> +
> +	SW_RESET_IN_PGM(10);
> +
> +	if (get_unaligned_le16(&ts->dwz_info.product_code) & 0x60) {
> +		/* Lime fw size */
> +		dev_dbg(&ts->client->dev, "used lime IC");
> +		ts->fw_size = 1024 * 64;
> +		ts->nvm_mask = 0x0030027B;
> +	} else if (get_unaligned_le16(&ts->dwz_info.product_code) & 0x40) {
> +		/* Crimson IC */
> +		dev_dbg(&ts->client->dev, "used crimson IC");
> +		ts->fw_size = 1024 * 48;
> +		ts->nvm_mask = 0x00310000;
> +	}
> +
> +	dev_dbg(&ts->client->dev, "firmware release version : %04x",
> +		get_unaligned_le16(&ts->dwz_info.release_ver));
> +
> +	mdelay(50);
> +
> +	return 0;
> +}
> +
> +static int hideep_i2c_read(struct hideep_ts *ts, unsigned short addr,
> +	unsigned short len, unsigned char *buf)
> +{
> +	int ret;
> +	struct i2c_msg msg[2];
> +
> +	mutex_lock(&ts->i2c_mutex);

I still have the same question as in my other email: why do we need to
protect individual I2C transfers?

> +
> +	dev_dbg(&ts->client->dev, "addr = 0x%02x, len = %d", addr, len);
> +
> +	msg[0].addr = ts->client->addr;
> +	msg[0].flags = 0;
> +	msg[0].len = 2;
> +	msg[0].buf = (u8 *)&addr;
> +
> +	msg[1].addr = ts->client->addr;
> +	msg[1].flags = I2C_M_RD;
> +	msg[1].len = len;
> +	msg[1].buf = buf;
> +
> +	ret = i2c_transfer(ts->client->adapter, msg, 2);
> +
> +	mutex_unlock(&ts->i2c_mutex);
> +	return ret;
> +}
> +
> +static int hideep_i2c_write(struct hideep_ts *ts, unsigned short addr,
> +	unsigned short len, unsigned char *buf)
> +{
> +	int ret;
> +	unsigned char *wbuf;
> +	struct i2c_msg msg;
> +
> +	dev_dbg(&ts->client->dev, "addr = 0x%02x, len = %d", addr, len);
> +
> +	wbuf = kmalloc(len + 2, GFP_KERNEL);

Error handling.

> +
> +	mutex_lock(&ts->i2c_mutex);
> +
> +	put_unaligned_le16(addr, &wbuf[0]);
> +	memcpy(&wbuf[2], buf, len);
> +
> +	msg.addr = ts->client->addr;
> +	msg.flags = 0;
> +	msg.len = len + 2;
> +	msg.buf = wbuf;
> +
> +	ret = i2c_transfer(ts->client->adapter, &msg, 1);
> +
> +	mutex_unlock(&ts->i2c_mutex);
> +
> +	kfree(wbuf);
> +
> +	return  ret;
> +}
> +
> +static void hideep_reset_ic(struct hideep_ts *ts)
> +{
> +	unsigned char cmd = 0x01;
> +
> +	if (!ts->reset_gpio) {
> +		dev_dbg(&ts->client->dev, "hideep:enable the reset_gpio");
> +		gpiod_set_value(ts->reset_gpio, GPIOD_OUT_LOW);

I believe you mean GPIOD_OUT_HIGH here: you want to activate reset line.
Remember, here you are dealing with logical state, gpiod API will
convert to the right value based on declared GPIO polarity (active low
or high).

> +		mdelay(20);
> +		gpiod_set_value(ts->reset_gpio, GPIOD_OUT_HIGH);
> +	} else {
> +		hideep_i2c_write(ts, HIDEEP_RESET_CMD, 1, &cmd);
> +	}
> +	mdelay(50);

I would prefer if you integrated the reset into power on/power off
sequence and also shut off the power in suspend (if you have GPIO/reset
line and the device is not a wakeup source).

> +}
> +
> +static int hideep_pwr_on(struct hideep_ts *ts)
> +{
> +	int ret = 0;
> +
> +	if (!ts->vcc_vdd) {
> +		dev_dbg(&ts->client->dev, "hideep:vcc_vdd is enable");
> +		ret = regulator_enable(ts->vcc_vdd);
> +		if (ret)
> +			dev_err(&ts->client->dev,
> +				"Regulator vdd enable failed ret=%d", ret);
> +		usleep_range(999, 1000);
> +	}
> +
> +
> +	if (!ts->vcc_vid) {
> +		dev_dbg(&ts->client->dev, "hideep:vcc_vid is enable");
> +		ret = regulator_enable(ts->vcc_vid);
> +		if (ret)
> +			dev_err(&ts->client->dev,
> +				"Regulator vcc_vid enable failed ret=%d", ret);
> +		usleep_range(2999, 3000);
> +	}
> +
> +	return ret;
> +}
> +
> +static void hideep_pwr_off(void *data)
> +{
> +	struct hideep_ts *ts = data;
> +
> +	if (!ts->reset_gpio)
> +		gpiod_set_value(ts->reset_gpio, GPIOD_OUT_LOW);
> +
> +	if (!ts->vcc_vid)
> +		regulator_disable(ts->vcc_vid);
> +
> +	if (!ts->vcc_vdd)
> +		regulator_disable(ts->vcc_vdd);
> +}
> +
> +#define __GET_MT_TOOL_TYPE(X) ((X == 0x01) ? MT_TOOL_FINGER : MT_TOOL_PEN)
> +
> +static void push_mt(struct hideep_ts *ts)
> +{
> +	int id;
> +	int i;
> +	bool btn_up = 0;
> +	int evt = 0;
> +	int offset = sizeof(struct hideep_event);
> +	struct hideep_event *event;
> +
> +	/* load multi-touch event to input system */
> +	for (i = 0; i < ts->tch_count; i++) {
> +		event = (struct hideep_event *)&ts->touch_event[i * offset];
> +		id = (event->index >> 0) & 0x0F;
> +		btn_up = (event->flag >> HIDEEP_MT_RELEASED) & 0x01;

There is no need to convert. You just say

	int release;

	...

		release = event->flag & HIDEEP_MT_RELEASED_BIT;

> +
> +		dev_dbg(&ts->client->dev,
> +			"type = %d, id = %d, i = %d, x = %d, y = %d, z = %d",
> +			event->type, event->index, i,
> +			get_unaligned_le16(&event->x),
> +			get_unaligned_le16(&event->y),
> +			get_unaligned_le16(&event->z));
> +
> +		input_mt_slot(ts->input_dev, id);
> +		input_mt_report_slot_state(ts->input_dev,
> +			__GET_MT_TOOL_TYPE(event->type),
> +			(btn_up == 0));
> +
> +		if (btn_up == 0) {
> +			input_report_abs(ts->input_dev, ABS_MT_POSITION_X,
> +				get_unaligned_le16(&event->x));
> +			input_report_abs(ts->input_dev, ABS_MT_POSITION_Y,
> +				get_unaligned_le16(&event->y));
> +			input_report_abs(ts->input_dev, ABS_MT_PRESSURE,
> +				get_unaligned_le16(&event->z));
> +			input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR,
> +				event->w);
> +			evt++;
> +		}
> +	}
> +
> +	input_mt_sync_frame(ts->input_dev);
> +}
> +
> +static void push_ky(struct hideep_ts *ts)
> +{
> +	int i;
> +	int status;
> +	int code;
> +
> +	for (i = 0; i < ts->key_count; i++) {
> +		code = ts->key_event[i + i * 2] & 0x0F;
> +		status = ts->key_event[i + i * 2] & 0xF0;

This does not seem right. Are you sure you want index [i*3] and not
[i*2 + 1]?

> +
> +		input_report_key(ts->input_dev, ts->key_codes[code],
> +			status & HIDEEP_KEY_PRESSED_MASK);
> +	}
> +}
> +
> +static void hideep_put_event(struct hideep_ts *ts)
> +{
> +	/* mangling touch information */
> +	if (ts->tch_count > 0)
> +		push_mt(ts);
> +
> +	if (ts->key_count > 0)
> +		push_ky(ts);
> +
> +	input_sync(ts->input_dev);
> +}
> +
> +static int hideep_get_event(struct hideep_ts *ts)
> +{
> +	int ret;
> +	int touch_count;
> +	int event_size;
> +
> +	/* get touch event count */
> +	dev_dbg(&ts->client->dev, "mt = %d, key = %d, lpm = %02x",
> +		ts->tch_count, ts->key_count, ts->lpm_count);
> +
> +	/* get touch event information */
> +	if (ts->tch_count > HIDEEP_MT_MAX)
> +		ts->tch_count = 0;
> +
> +	if (ts->key_count > HIDEEP_KEY_MAX)
> +		ts->key_count = 0;
> +
> +	touch_count = ts->tch_count + ts->key_count;
> +
> +	if (ts->tch_count > 0) {
> +		event_size = ts->tch_count *
> +			sizeof(struct hideep_event);
> +		ret = hideep_i2c_read(ts, HIDEEP_TOUCH_DATA_ADDR,
> +			event_size, ts->touch_event);
> +
> +		if (ret < 0) {
> +			dev_err(&ts->client->dev, "read I2C error.");
> +			return ret;
> +		}
> +	}
> +
> +	if (ts->key_count > 0) {
> +		event_size = ts->key_count * 2;
> +		ret = hideep_i2c_read(ts, HIDEEP_KEY_DATA_ADDR,
> +			event_size, ts->key_event);
> +		if (ret < 0) {
> +			dev_err(&ts->client->dev, "read I2C error.");
> +			return ret;
> +		}
> +	}
> +
> +	return touch_count;
> +}
> +
> +static irqreturn_t hideep_irq_task(int irq, void *handle)
> +{
> +	unsigned char buff[2];
> +	int ret;
> +
> +	struct hideep_ts *ts = handle;
> +
> +	dev_dbg(&ts->client->dev, "state = 0x%x", ts->dev_state);
> +
> +	if (ts->dev_state == state_normal) {
> +		ret = hideep_i2c_read(ts, HIDEEP_EVENT_COUNT_ADDR,
> +			2, buff);
> +
> +		if (ret < 0) {
> +			disable_irq(ts->client->irq);

You can not disable IRQ from IRQ handler. Also, why do you want to do
that.

> +			return IRQ_HANDLED;
> +		}
> +
> +		ts->tch_count = buff[0];
> +		ts->key_count = buff[1] & 0x0f;
> +		ts->lpm_count = buff[1] & 0xf0;
> +
> +		ret = hideep_get_event(ts);

The way your code is laid out you usually have 2 I2C transactions per
interrupt. Can you combine reading from HIDEEP_EVENT_COUNT_ADDR and
continue to reading the touch and key data in one transaction (the
addresses are consecutive so I think it should work), and then figure
out the parts of the buffer that contain valid data? 

> +
> +		if (ret >= 0)
> +			hideep_put_event(ts);
> +	}
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int hideep_capability(struct hideep_ts *ts)
> +{
> +	int ret, i;
> +
> +	ts->input_dev->name = HIDEEP_TS_NAME;
> +	ts->input_dev->id.bustype = BUS_I2C;
> +
> +	if (ts->key_num) {
> +		ts->input_dev->keycode = ts->key_codes;
> +		ts->input_dev->keycodesize = sizeof(ts->key_codes[0]);
> +		ts->input_dev->keycodemax = ts->key_num;
> +		for (i = 0; i < ts->key_num; i++)
> +			input_set_capability(ts->input_dev, EV_KEY,
> +				ts->key_codes[i]);
> +	}
> +
> +	input_set_abs_params(ts->input_dev,
> +		ABS_MT_TOOL_TYPE, 0, MT_TOOL_MAX, 0, 0);
> +	input_set_abs_params(ts->input_dev,
> +		ABS_MT_POSITION_X, 0, ts->prop.max_x, 0, 0);
> +	input_set_abs_params(ts->input_dev,
> +		ABS_MT_POSITION_Y, 0, ts->prop.max_y, 0, 0);
> +	input_set_abs_params(ts->input_dev,
> +		ABS_MT_PRESSURE, 0, 65535, 0, 0);
> +	input_set_abs_params(ts->input_dev,
> +		ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
> +
> +	ret = input_mt_init_slots(ts->input_dev,
> +		HIDEEP_MT_MAX, INPUT_MT_DIRECT);
> +
> +	return ret;
> +}
> +
> +static void hideep_get_info(struct hideep_ts *ts)
> +{
> +	unsigned char val[4];
> +
> +	if (ts->prop.max_x == 0 || ts->prop.max_y == 0) {
> +		hideep_i2c_read(ts, 0x28, 4, val);

Error handling?

> +
> +		ts->prop.max_x = get_unaligned_le16(&val[2]);
> +		ts->prop.max_y = get_unaligned_le16(&val[0]);
> +
> +		dev_info(&ts->client->dev, "X : %d, Y : %d",
> +			ts->prop.max_x, ts->prop.max_y);

dev_dbg.

> +	}
> +}
> +
> +static ssize_t hideep_update_fw(struct device *dev,
> +	struct device_attribute *attr, const char *buf, size_t count)
> +{
> +	struct hideep_ts *ts = dev_get_drvdata(dev);
> +	int mode, ret;
> +	char *fw_name;
> +
> +	ret = kstrtoint(buf, 8, &mode);
> +	if (ret)
> +		return ret;
> +
> +	disable_irq(ts->client->irq);
> +
> +	ts->dev_state = state_updating;
> +	fw_name = kasprintf(GFP_KERNEL, "hideep_ts_%04x.bin",
> +		get_unaligned_le16(&ts->dwz_info.product_id));
> +	ret = hideep_update_firmware(ts, fw_name);
> +
> +	if (ret != 0)
> +		dev_err(dev, "The firmware update failed(%d)", ret);
> +
> +	kfree(fw_name);
> +
> +	ret = hideep_load_dwz(ts);
> +
> +	if (ret < 0)
> +		dev_err(&ts->client->dev, "fail to load dwz, ret = 0x%x", ret);
> +
> +	enable_irq(ts->client->irq);
> +
> +	ts->dev_state = state_normal;
> +
> +	return count;
> +}
> +
> +static ssize_t hideep_fw_version_show(struct device *dev,
> +	struct device_attribute *attr, char *buf)
> +{
> +	int len = 0;
> +	struct hideep_ts *ts = dev_get_drvdata(dev);
> +
> +	dev_info(dev, "release version : %04x",
> +		get_unaligned_le16(&ts->dwz_info.release_ver));

Why do you log the value here? You will get it in the buffer.

> +
> +	mutex_lock(&ts->dev_mutex);
> +	len = scnprintf(buf, PAGE_SIZE,
> +		"%04x\n", get_unaligned_le16(&ts->dwz_info.release_ver));
> +	mutex_unlock(&ts->dev_mutex);
> +
> +	return len;
> +}
> +
> +static ssize_t hideep_product_id_show(struct device *dev,
> +	struct device_attribute *attr, char *buf)
> +{
> +	int len = 0;
> +	struct hideep_ts *ts = dev_get_drvdata(dev);
> +
> +	dev_info(dev, "product id : %04x",
> +		get_unaligned_le16(&ts->dwz_info.product_id));

Same here, why the log?

> +
> +	mutex_lock(&ts->dev_mutex);
> +	len = scnprintf(buf, PAGE_SIZE,
> +		"%04x\n", get_unaligned_le16(&ts->dwz_info.product_id));
> +	mutex_unlock(&ts->dev_mutex);
> +
> +	return len;
> +}
> +
> +static DEVICE_ATTR(version, 0664, hideep_fw_version_show, NULL);
> +static DEVICE_ATTR(product_id, 0664, hideep_product_id_show, NULL);
> +static DEVICE_ATTR(update_fw, 0664, NULL, hideep_update_fw);
> +
> +static struct attribute *hideep_ts_sysfs_entries[] = {
> +	&dev_attr_version.attr,
> +	&dev_attr_product_id.attr,
> +	&dev_attr_update_fw.attr,
> +	NULL,
> +};
> +
> +static struct attribute_group hideep_ts_attr_group = {
> +	.attrs = hideep_ts_sysfs_entries,
> +};
> +
> +static int __maybe_unused hideep_resume(struct device *dev)
> +{
> +	struct hideep_ts *ts = dev_get_drvdata(dev);
> +	unsigned char sleep_cmd = 0x00;
> +
> +	mutex_lock(&ts->dev_mutex);
> +
> +	if (ts->dev_state != state_normal)

We know that the state should be sleep, why do we need to check it?

> +		ts->dev_state = state_normal;
> +
> +	hideep_i2c_write(ts, HIDEEP_SLEEP_CMD, 1, &sleep_cmd);
> +	enable_irq(ts->client->irq);
> +
> +	mdelay(10);
> +	hideep_reset_ic(ts);
> +
> +	mutex_unlock(&ts->dev_mutex);
> +	return 0;
> +}
> +
> +static int __maybe_unused hideep_suspend(struct device *dev)
> +{
> +	struct hideep_ts *ts = dev_get_drvdata(dev);
> +	unsigned char sleep_cmd = 0x01;
> +
> +	mutex_lock(&ts->dev_mutex);
> +
> +	if (ts->dev_state != state_sleep)
> +		ts->dev_state = state_sleep;
> +
> +	/* default deep sleep */
> +	hideep_i2c_write(ts, HIDEEP_SLEEP_CMD, 1, &sleep_cmd);
> +	disable_irq(ts->client->irq);
> +
> +	mutex_unlock(&ts->dev_mutex);
> +	return 0;
> +}
> +
> +static int  hideep_parse_dts(struct device *dev, struct hideep_ts *ts)
> +{
> +	int ret;
> +
> +	ts->reset_gpio = devm_gpiod_get_optional(dev, "reset",
> +							GPIOD_OUT_HIGH);
> +	if (IS_ERR(ts->reset_gpio))
> +		return PTR_ERR(ts->reset_gpio);
> +
> +	ts->vcc_vdd = devm_regulator_get(dev, "vdd");
> +	if (IS_ERR(ts->vcc_vdd))
> +		return PTR_ERR(ts->vcc_vdd);
> +
> +	ts->vcc_vid = devm_regulator_get(dev, "vid");
> +	if (IS_ERR(ts->vcc_vid))
> +		return PTR_ERR(ts->vcc_vid);
> +
> +	ts->key_num = device_property_read_u32_array(dev, "linux,keycodes",
> +						NULL, 0);
> +
> +	if (ts->key_num > HIDEEP_KEY_MAX) {
> +		dev_err(dev, "too many support key defined(%d)!!!",
> +			ts->key_num);
> +		return -EINVAL;
> +	}
> +
> +	ret = device_property_read_u32_array(dev, "linux,keycodes",
> +				ts->key_codes, ts->key_num);
> +	if (ret) {
> +		dev_dbg(dev, "don't support touch key");
> +		ts->key_num = 0;
> +	}
> +
> +	return 0;
> +}
> +
> +static int hideep_probe(struct i2c_client *client,
> +	const struct i2c_device_id *id)
> +{
> +	int ret = 0;
> +	struct hideep_ts *ts;
> +
> +	/* check i2c bus */
> +	if (!i2c_check_functionality(client->adapter,
> +		I2C_FUNC_I2C)) {
> +		dev_err(&client->dev, "check i2c device error");
> +		return -ENODEV;
> +	}
> +
> +	/* init hideep_ts */
> +	ts = devm_kzalloc(&client->dev,
> +		sizeof(*ts), GFP_KERNEL);
> +	if (!ts)
> +		return -ENOMEM;
> +
> +	ret = hideep_parse_dts(&client->dev, ts);
> +
> +	if (ret)
> +		return ret;
> +
> +	ts->client = client;
> +
> +	i2c_set_clientdata(client, ts);
> +
> +	mutex_init(&ts->i2c_mutex);
> +	mutex_init(&ts->dev_mutex);
> +
> +	/* power on */
> +	ret = hideep_pwr_on(ts);
> +	if (ret) {
> +		dev_err(&ts->client->dev, "power on failed");
> +		return ret;
> +	}
> +
> +	ret = devm_add_action(&ts->client->dev, hideep_pwr_off, ts);

devm_add_action_or_reset()

> +	if (ret) {
> +		hideep_pwr_off(ts);
> +		return ret;
> +	}
> +
> +	ts->dev_state = state_init;
> +	mdelay(30);
> +
> +	/* ic reset */
> +	hideep_reset_ic(ts);
> +
> +	/* read info */
> +	ret = hideep_load_dwz(ts);
> +	if (ret < 0) {
> +		dev_err(&client->dev, "fail to load dwz, ret = 0x%x", ret);
> +		return ret;
> +	}
> +
> +	/* init input device */
> +	ts->input_dev = devm_input_allocate_device(&client->dev);
> +	if (!ts->input_dev) {
> +		dev_err(&client->dev, "can't allocate memory for input_dev");
> +		return -ENOMEM;
> +	}
> +
> +	touchscreen_parse_properties(ts->input_dev, true, &ts->prop);
> +	hideep_get_info(ts);
> +
> +	ret = hideep_capability(ts);
> +	if (ret) {
> +		dev_err(&client->dev, "can't init input properties");
> +		return ret;
> +	}
> +
> +	ret = input_register_device(ts->input_dev);
> +	if (ret) {
> +		dev_err(&client->dev, "can't register input_dev");
> +		return ret;
> +	}
> +
> +	input_set_drvdata(ts->input_dev, ts);
> +
> +	dev_info(&ts->client->dev, "ts irq: %d", ts->client->irq);
> +	if (IS_ERR(&ts->client->irq)) {

client->irq is never PTR_ERR encoded. You need to do

	if (client->irq <= 0)
		...

> +		dev_err(&client->dev, "can't be assigned irq");
> +		return -ENOMEM;

Why ENOMEM? I'd say -EINVAL.

> +	}
> +
> +	ret = devm_request_threaded_irq(&client->dev, ts->client->irq,
> +		NULL, hideep_irq_task, IRQF_ONESHOT,
> +		ts->client->name, ts);
> +
> +	disable_irq(ts->client->irq);
> +
> +	if (ret < 0) {
> +		dev_err(&client->dev, "fail to get irq, ret = 0x%08x",
> +			ret);
> +		return ret;
> +	}
> +
> +	ts->dev_state = state_normal;
> +	enable_irq(ts->client->irq);

Why do we need this disable/enable IRQ?

> +
> +	ret = devm_device_add_group(&client->dev, &hideep_ts_attr_group);
> +
> +	if (ret) {
> +		dev_err(&client->dev, "fail init sys, ret = 0x%x", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(hideep_pm_ops, hideep_suspend, hideep_resume);
> +
> +static const struct i2c_device_id hideep_dev_idtable[] = {
> +	{ HIDEEP_I2C_NAME, 0 },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(i2c, hideep_dev_idtable);
> +
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id hideep_acpi_id[] = {
> +	{ "HIDP0001", 0 },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(acpi, hideep_acpi_id);
> +#endif
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id hideep_match_table[] = {
> +	{ .compatible = "hideep,hideep-ts" },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, hideep_match_table);
> +#endif
> +
> +static struct i2c_driver hideep_driver = {
> +	.probe = hideep_probe,
> +	.id_table = hideep_dev_idtable,
> +	.driver = {
> +		.name = HIDEEP_I2C_NAME,
> +		.of_match_table = of_match_ptr(hideep_match_table),
> +		.acpi_match_table = ACPI_PTR(hideep_acpi_id),
> +		.pm = &hideep_pm_ops,
> +	},
> +};
> +
> +module_i2c_driver(hideep_driver);
> +
> +MODULE_DESCRIPTION("Driver for HiDeep Touchscreen Controller");
> +MODULE_AUTHOR("anthony.kim@hideep.com");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.7.4
> 

Thanks.

On Thu, Sep 14, 2017 at 01:36:44PM +0900, Anthony Kim wrote:
> The HiDeep touchscreen device is a capacitive multi-touch controller
> mainly for multi-touch supported devices use. It use I2C interface for
> communication to IC and provide axis X, Y, Z locations for ten finger
> touch through input event interface to userspace.
> 
> It support the Crimson and the Lime two type IC. They are different
> the number of channel supported and FW size. But the working protocol
> is same.
> 
> Signed-off-by: Anthony Kim <anthony.kim@hideep.com>
> ---
>  .../bindings/input/touchscreen/hideep.txt          |   42 +
>  .../devicetree/bindings/vendor-prefixes.txt        |    1 +

Please add acks when posting new versions.

>  drivers/input/touchscreen/Kconfig                  |   11 +
>  drivers/input/touchscreen/Makefile                 |    1 +
>  drivers/input/touchscreen/hideep.c                 | 1274 ++++++++++++++++++++
>  5 files changed, 1329 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/touchscreen/hideep.txt
>  create mode 100644 drivers/input/touchscreen/hideep.c
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