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Subject: Re: [PATCH v4 1/2] Input: Add driver for Cypress Generation 5
 touchscreen
To:     Mylene Josserand <mylene.josserand@free-electrons.com>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc:     robh+dt@kernel.org, mark.rutland@arm.com,
        linux-kernel@vger.kernel.org, linux-input@vger.kernel.org,
        devicetree@vger.kernel.org, thomas.petazzoni@free-electrons.com,
        maxime.ripard@free-electrons.com
References: <20171201153957.13053-1-mylene.josserand@free-electrons.com>
 <20171201153957.13053-2-mylene.josserand@free-electrons.com>
 <20180123041503.cezgsi7h2h4twu7n@dtor-ws>
 <20180123114459.07cc3404@dell-desktop.home>
From:   landyn.lawrence@boerse.site
Message-ID: <da1afc95-2244-d21d-879f-853cc3def9bf@boerse.site>
Date:   Tue, 23 Jan 2018 11:50:22 +0100
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In-Reply-To: <20180123114459.07cc3404@dell-desktop.home>
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Sender: linux-kernel-owner@vger.kernel.org
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Hey,

thanks for the great work on this one!

Best regards

On 01/23/2018 11:44 AM, Mylene Josserand wrote:
> Hi Dmitry,
> 
> Thank you for the review.
> 
> Le Mon, 22 Jan 2018 20:15:03 -0800,
> Dmitry Torokhov <dmitry.torokhov@gmail.com> a écrit :
> 
>> Hi Mylène,
>>
>> On Fri, Dec 01, 2017 at 04:39:56PM +0100, Mylène Josserand wrote:
>>> This is the basic driver for the Cypress TrueTouch Gen5 touchscreen
>>> controllers. This driver supports only the I2C bus but it uses regmap
>>> so SPI support could be added later.
>>> The touchscreen can retrieve some defined zone that are handled as
>>> buttons (according to the hardware). That is why it handles
>>> button and multitouch events.
>>>
>>> Reviewed-by: Maxime Ripard <maxime.ripard@free-electrons.com>
>>> Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com>
>>> ---
>>>   drivers/input/touchscreen/Kconfig   |   16 +
>>>   drivers/input/touchscreen/Makefile  |    1 +
>>>   drivers/input/touchscreen/cyttsp5.c | 1110 +++++++++++++++++++++++++++++++++++
>>>   3 files changed, 1127 insertions(+)
>>>   create mode 100644 drivers/input/touchscreen/cyttsp5.c
>>>
>>> diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
>>> index 0cfdb7cb610e..28eea6d5f1bb 100644
>>> --- a/drivers/input/touchscreen/Kconfig
>>> +++ b/drivers/input/touchscreen/Kconfig
>>> @@ -238,6 +238,22 @@ config TOUCHSCREEN_CYTTSP4_SPI
>>>   	  To compile this driver as a module, choose M here: the
>>>   	  module will be called cyttsp4_spi.
>>>   
>>> +config TOUCHSCREEN_CYTTSP5
>>> +	tristate "Cypress TrueTouch Gen5 Touchscreen Driver"
>>> +	depends on OF
>>
>> Does it have to be? Please use generic device properties
>> (device_property_* API) and it can be used with ACPI and static board
>> files, of needed.
> 
> Okay, I will try with that.
> 
>>
>>> +	select REGMAP_I2C
>>> +	select CRC_ITU_T
>>> +	help
>>> +	  Driver for Parade TrueTouch Standard Product
>>> +	  Generation 5 touchscreen controllers.
>>> +	  I2C bus interface support only.
>>> +
>>> +	  Say Y here if you have a Cypress Gen5 touchscreen.
>>> +	  If unsure, say N.
>>> +
>>> +	  To compile this driver as a module, choose M here: the
>>> +	  module will be called cyttsp5.
>>> +
>>>   config TOUCHSCREEN_DA9034
>>>   	tristate "Touchscreen support for Dialog Semiconductor DA9034"
>>>   	depends on PMIC_DA903X
>>> diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
>>> index d2a2b3b7af27..e7d124901dd9 100644
>>> --- a/drivers/input/touchscreen/Makefile
>>> +++ b/drivers/input/touchscreen/Makefile
>>> @@ -26,6 +26,7 @@ obj-$(CONFIG_TOUCHSCREEN_CYTTSP_SPI)	+= cyttsp_spi.o
>>>   obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_CORE)	+= cyttsp4_core.o
>>>   obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_I2C)	+= cyttsp4_i2c.o cyttsp_i2c_common.o
>>>   obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_SPI)	+= cyttsp4_spi.o
>>> +obj-$(CONFIG_TOUCHSCREEN_CYTTSP5)	+= cyttsp5.o
>>>   obj-$(CONFIG_TOUCHSCREEN_DA9034)	+= da9034-ts.o
>>>   obj-$(CONFIG_TOUCHSCREEN_DA9052)	+= da9052_tsi.o
>>>   obj-$(CONFIG_TOUCHSCREEN_DYNAPRO)	+= dynapro.o
>>> diff --git a/drivers/input/touchscreen/cyttsp5.c b/drivers/input/touchscreen/cyttsp5.c
>>> new file mode 100644
>>> index 000000000000..a41feea2cd5a
>>> --- /dev/null
>>> +++ b/drivers/input/touchscreen/cyttsp5.c
>>> @@ -0,0 +1,1110 @@
>>> +/*
>>> + * Parade TrueTouch(TM) Standard Product V5 Module.
>>> + * For use with Parade touchscreen controllers.
>>> + *
>>> + * Copyright (C) 2015 Parade Technologies
>>> + * Copyright (C) 2012-2015 Cypress Semiconductor
>>> + * Copyright (C) 2017 Free Electrons
>>> + *
>>> + * Author: Mylène Josserand <mylene.josserand@free-electrons.com>
>>> + *
>>> + * This program is free software; you can redistribute it and/or
>>> + * modify it under the terms of the GNU General Public License
>>> + * version 2, and only version 2, as published by the
>>> + * Free Software Foundation.
>>> + *
>>> + * This program is distributed in the hope that it will be useful,
>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>> + * GNU General Public License for more details.
>>> + *
>>> + */
>>> +
>>> +#include <asm/unaligned.h>
>>> +#include <linux/crc-itu-t.h>
>>> +#include <linux/delay.h>
>>> +#include <linux/device.h>
>>> +#include <linux/gpio.h>
>>> +#include <linux/input/mt.h>
>>> +#include <linux/input/touchscreen.h>
>>> +#include <linux/interrupt.h>
>>> +#include <linux/i2c.h>
>>> +#include <linux/module.h>
>>> +#include <linux/of_device.h>
>>> +#include <linux/regmap.h>
>>> +
>>> +#define CYTTSP5_NAME				"cyttsp5"
>>> +#define CY_I2C_DATA_SIZE			(2 * 256)
>>> +#define HID_VERSION				0x0100
>>> +#define CY_MAX_INPUT				512
>>> +#define CYTTSP5_PREALLOCATED_CMD_BUFFER	32
>>> +#define CY_BITS_PER_BTN			1
>>> +#define CY_NUM_BTN_EVENT_ID			((1 << CY_BITS_PER_BTN) - 1)
>>> +
>>> +#define MAX_AREA				255
>>> +#define HID_OUTPUT_BL_SOP			0x1
>>> +#define HID_OUTPUT_BL_EOP			0x17
>>> +#define HID_OUTPUT_BL_LAUNCH_APP		0x3B
>>> +#define HID_OUTPUT_BL_LAUNCH_APP_SIZE		11
>>> +#define HID_OUTPUT_GET_SYSINFO			0x2
>>> +#define HID_OUTPUT_GET_SYSINFO_SIZE		5
>>> +
>>> +#define HID_DESC_REG				0x1
>>> +#define HID_INPUT_REG				0x3
>>> +#define HID_OUTPUT_REG				0x4
>>> +
>>> +#define REPORT_ID_TOUCH			0x1
>>> +#define REPORT_ID_BTN				0x3
>>> +#define REPORT_SIZE_5				5
>>> +#define REPORT_SIZE_8				8
>>> +#define REPORT_SIZE_16				16
>>> +
>>> +/* Touch reports offsets */
>>> +/* Header offsets */
>>> +#define TOUCH_REPORT_DESC_HDR_CONTACTCOUNT	16
>>> +/* Record offsets */
>>> +#define TOUCH_REPORT_DESC_CONTACTID		8
>>> +#define TOUCH_REPORT_DESC_X			16
>>> +#define TOUCH_REPORT_DESC_Y			32
>>> +#define TOUCH_REPORT_DESC_P			48
>>> +#define TOUCH_REPORT_DESC_MAJ			56
>>> +#define TOUCH_REPORT_DESC_MIN			64
>>> +
>>> +/* HID */
>>> +#define HID_TOUCH_REPORT_ID			0x1
>>> +#define HID_BTN_REPORT_ID			0x3
>>> +#define HID_APP_RESPONSE_REPORT_ID		0x1F
>>> +#define HID_APP_OUTPUT_REPORT_ID		0x2F
>>> +#define HID_BL_RESPONSE_REPORT_ID		0x30
>>> +#define HID_BL_OUTPUT_REPORT_ID		0x40
>>> +
>>> +#define HID_OUTPUT_RESPONSE_REPORT_OFFSET	2
>>> +#define HID_OUTPUT_RESPONSE_CMD_OFFSET		4
>>> +#define HID_OUTPUT_RESPONSE_CMD_MASK		0x7F
>>> +
>>> +#define HID_SYSINFO_SENSING_OFFSET		33
>>> +#define HID_SYSINFO_BTN_OFFSET			48
>>> +#define HID_SYSINFO_BTN_MASK			0xFF
>>> +#define HID_SYSINFO_MAX_BTN			8
>>> +
>>> +/*  Timeout in ms */
>>> +#define CY_HID_OUTPUT_TIMEOUT			200
>>> +#define CY_HID_OUTPUT_GET_SYSINFO_TIMEOUT	3000
>>> +#define CY_HID_GET_HID_DESCRIPTOR_TIMEOUT	4000
>>> +
>>> +/* maximum number of concurrent tracks */
>>> +#define TOUCH_REPORT_SIZE			10
>>> +#define TOUCH_INPUT_HEADER_SIZE		7
>>> +#define BTN_REPORT_SIZE			9
>>> +#define BTN_INPUT_HEADER_SIZE			5
>>> +
>>> +/* All usage pages for Touch Report */
>>> +#define TOUCH_REPORT_USAGE_PG_X		0x00010030
>>> +#define TOUCH_REPORT_USAGE_PG_Y		0x00010031
>>> +#define TOUCH_REPORT_USAGE_PG_P		0x000D0030
>>> +#define TOUCH_REPORT_USAGE_PG_CONTACTID	0x000D0051
>>> +#define TOUCH_REPORT_USAGE_PG_CONTACTCOUNT	0x000D0054
>>> +#define TOUCH_REPORT_USAGE_PG_MAJ		0xFF010062
>>> +#define TOUCH_REPORT_USAGE_PG_MIN		0xFF010063
>>> +#define TOUCH_COL_USAGE_PG			0x000D0022
>>> +
>>> +/* helpers */
>>> +#define HI_BYTE(x)				(u8)(((x) >> 8) & 0xFF)
>>> +#define LOW_BYTE(x)				(u8)((x) & 0xFF)
>>> +
>>> +/* System Information interface definitions */
>>> +struct cyttsp5_sensing_conf_data_dev {
>>> +	u8 electrodes_x;
>>> +	u8 electrodes_y;
>>> +	__le16 len_x;
>>> +	__le16 len_y;
>>> +	__le16 res_x;
>>> +	__le16 res_y;
>>> +	__le16 max_z;
>>> +	u8 origin_x;
>>> +	u8 origin_y;
>>> +	u8 btn;
>>> +	u8 scan_mode;
>>> +	u8 max_num_of_tch_per_refresh_cycle;
>>> +} __packed;
>>> +
>>> +struct cyttsp5_sensing_conf_data {
>>> +	u16 res_x;
>>> +	u16 res_y;
>>> +	u16 max_z;
>>> +	u16 len_x;
>>> +	u16 len_y;
>>> +	u8 origin_x;
>>> +	u8 origin_y;
>>> +	u8 max_tch;
>>> +};
>>> +
>>> +enum { HID_CMD_DONE, HID_CMD_BUSY } hid_cmd_state;
>>> +
>>> +enum cyttsp5_tch_abs {	/* for ordering within the extracted touch data array */
>>> +	CY_TCH_X,	/* X */
>>> +	CY_TCH_Y,	/* Y */
>>> +	CY_TCH_P,	/* P (Z) */
>>> +	CY_TCH_T,	/* TOUCH ID */
>>> +	CY_TCH_MAJ,	/* TOUCH_MAJOR */
>>> +	CY_TCH_MIN,	/* TOUCH_MINOR */
>>> +	CY_TCH_NUM_ABS,
>>> +};
>>> +
>>> +struct cyttsp5_tch_abs_params {
>>> +	size_t ofs;	/* abs byte offset */
>>> +	size_t size;	/* size in bits */
>>> +	size_t min;	/* min value */
>>> +	size_t max;	/* max value */
>>> +	size_t bofs;	/* bit offset */
>>> +};
>>> +
>>> +struct cyttsp5_touch {
>>> +	int hdr;
>>> +	int abs[CY_TCH_NUM_ABS];
>>> +};
>>> +
>>> +struct cyttsp5_sysinfo {
>>> +	struct cyttsp5_sensing_conf_data sensing_conf_data;
>>> +	int num_btns;
>>> +	struct cyttsp5_tch_abs_params tch_hdr;
>>> +	struct cyttsp5_tch_abs_params tch_abs[CY_TCH_NUM_ABS];
>>> +	u32 key_code[HID_SYSINFO_MAX_BTN];
>>> +	u8 *xy_mode;
>>> +	u8 *xy_data;
>>> +};
>>> +
>>> +struct cyttsp5_hid_desc {
>>> +	__le16 hid_desc_len;
>>> +	u8 packet_id;
>>> +	u8 reserved_byte;
>>> +	__le16 bcd_version;
>>> +	__le16 report_desc_len;
>>> +	__le16 report_desc_register;
>>> +	__le16 input_register;
>>> +	__le16 max_input_len;
>>> +	__le16 output_register;
>>> +	__le16 max_output_len;
>>> +	__le16 command_register;
>>> +	__le16 data_register;
>>> +	__le16 vendor_id;
>>> +	__le16 product_id;
>>> +	__le16 version_id;
>>> +	u8 reserved[4];
>>> +} __packed;
>>> +
>>> +struct cyttsp5 {
>>> +	struct device *dev;
>>> +	struct mutex system_lock;
>>> +	wait_queue_head_t wait_q;
>>> +	struct cyttsp5_sysinfo sysinfo;
>>> +	int hid_cmd_state;
>>> +	struct cyttsp5_hid_desc hid_desc;
>>> +	u8 cmd_buf[CYTTSP5_PREALLOCATED_CMD_BUFFER];
>>> +	u8 input_buf[CY_MAX_INPUT];
>>> +	u8 response_buf[CY_MAX_INPUT];
>>> +	struct gpio_desc *reset_gpio;
>>> +	struct input_dev *input;
>>> +	char phys[NAME_MAX];
>>> +	int num_prv_rec;
>>> +	struct regmap *regmap;
>>> +};
>>> +
>>> +/*
>>> + * For what understood in the datasheet, the register does not
>>> + * matter. For consistency, used the Input Register address
>>> + * but it does mean anything to the device. The important data
>>> + * to send is the I2C address
>>> + */
>>> +static int cyttsp5_read(struct cyttsp5 *ts, u8 *buf, u32 max)
>>> +{
>>> +	int rc;
>>> +	u32 size;
>>> +	u8 temp[2];
>>> +
>>> +	if (!buf)
>>> +		return -EINVAL;
>>
>> Is it really possible? This is not a publicly facing API but private
>> driver data, do you ever happen to call it with NULL?
> 
> hm, I do not think so but I will check that.
> 
>>
>>> +
>>> +	/* Read the frame to retrieve the size */
>>> +	rc = regmap_bulk_read(ts->regmap, HID_INPUT_REG, temp, 2);
>>> +	if (rc < 0)
>>> +		return rc;
>>
>> Can we call this kind of variables "error" pelase?
> 
> Sure.
> 
>>
>>> +
>>> +	size = get_unaligned_le16(temp);
>>> +	if (!size || size == 2)
>>> +		return 0;
>>> +
>>> +	if (size > max)
>>> +		return -EINVAL;
>>> +
>>> +	/* Get the real value */
>>> +	return regmap_bulk_read(ts->regmap, HID_INPUT_REG, buf, size);
>>> +}
>>> +
>>> +static int cyttsp5_write(struct cyttsp5 *ts, unsigned int reg, u8 *data,
>>> +			 size_t size)
>>> +{
>>> +	u8 cmd[size + 1];
>>> +
>>> +	/* High bytes of register address needed as first byte of cmd */
>>> +	cmd[0] = HI_BYTE(reg);
>>> +
>>> +	/* Copy the rest of the data */
>>> +	if (data)
>>> +		memcpy(&cmd[1], data, size);
>>> +
>>> +	/* The hardware wants to receive a frame with the address register
>>
>> The multiline comment block should start with "/*" on a separate line
>> please.
> 
> I will change that.
> 
>>
>>> +	 * contains in the first two bytes. As the regmap_write function
>>> +	 * add the register adresse in the frame, we use the LOW_BYTE as
>>> +	 * first frame byte for the address register and the first
>>> +	 * data byte is the high register + left of the cmd to send
>>> +	 */
>>> +	return regmap_bulk_write(ts->regmap, LOW_BYTE(reg), cmd, size + 1);
>>> +}
>>> +
>>> +static void cyttsp5_final_sync(struct input_dev *input, int max_slots,
>>> +			       unsigned long *ids)
>>> +{
>>> +	int t;
>>> +
>>> +	for (t = 0; t < max_slots; t++) {
>>
>> 	for_each_set_bit() {
>> 	}
> 
> I did not know this macro, I will try that.
> 
>>
>>> +		if (test_bit(t, ids))
>>> +			continue;
>>> +		input_mt_slot(input, t);
>>> +		input_mt_report_slot_state(input, MT_TOOL_FINGER, false);
>>> +	}
>>> +
>>> +	input_sync(input);
>>> +}
>>> +
>>> +static void cyttsp5_report_slot_liftoff(struct cyttsp5 *ts, int max_slots)
>>> +{
>>> +	int t;
>>> +
>>> +	if (ts->num_prv_rec == 0)
>>> +		return;
>>
>> Do you need this check? The caller checks the same condition.
> 
> True, I will remove it.
> 
>>
>>> +
>>> +	for (t = 0; t < max_slots; t++) {
>>> +		input_mt_slot(ts->input, t);
>>> +		input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, false);
>>> +	}
>>> +}
>>> +
>>> +static void cyttsp5_mt_lift_all(struct cyttsp5 *ts)
>>> +{
>>> +	struct cyttsp5_sysinfo *si = &ts->sysinfo;
>>> +	int max = si->tch_abs[CY_TCH_T].max;
>>> +
>>> +	if (ts->num_prv_rec != 0) {
>>> +		cyttsp5_report_slot_liftoff(ts, max);
>>> +		input_sync(ts->input);
>>> +		ts->num_prv_rec = 0;
>>> +	}
>>> +}
>>> +
>>> +static void cyttsp5_get_touch_axis(int *axis, int size, int max, u8 *xy_data,
>>> +				   int bofs)
>>> +{
>>> +	int nbyte;
>>> +	int next;
>>> +
>>> +	for (nbyte = 0, *axis = 0, next = 0; nbyte < size; nbyte++)
>>> +		*axis = *axis + ((xy_data[nbyte] >> bofs) << (nbyte * 8));
>>> +
>>> +	*axis &= max - 1;
>>> +}
>>> +
>>> +static void cyttsp5_get_touch_record(struct cyttsp5 *ts,
>>> +				     struct cyttsp5_touch *touch, u8 *xy_data)
>>> +{
>>> +	struct cyttsp5_sysinfo *si = &ts->sysinfo;
>>> +	enum cyttsp5_tch_abs abs;
>>> +
>>> +	for (abs = CY_TCH_X; abs < CY_TCH_NUM_ABS; abs++) {
>>> +		cyttsp5_get_touch_axis(&touch->abs[abs],
>>> +				       si->tch_abs[abs].size,
>>> +				       si->tch_abs[abs].max,
>>> +				       xy_data + si->tch_abs[abs].ofs,
>>> +				       si->tch_abs[abs].bofs);
>>> +	}
>>> +}
>>> +
>>> +static void cyttsp5_get_mt_touches(struct cyttsp5 *ts,
>>> +				   struct cyttsp5_touch *tch, int num_cur_tch)
>>> +{
>>> +	struct cyttsp5_sysinfo *si = &ts->sysinfo;
>>> +	int i, t = 0;
>>> +	DECLARE_BITMAP(ids, si->tch_abs[CY_TCH_T].max);
>>> +	u8 *tch_addr;
>>> +	int tmp;
>>> +
>>> +	bitmap_zero(ids, si->tch_abs[CY_TCH_T].max);
>>> +	memset(tch->abs, 0, sizeof(tch->abs));
>>> +
>>> +	for (i = 0; i < num_cur_tch; i++) {
>>> +		tch_addr = si->xy_data + (i * TOUCH_REPORT_SIZE);
>>> +		cyttsp5_get_touch_record(ts, tch, tch_addr);
>>> +
>>> +		/* Convert MAJOR/MINOR from mm to resolution */
>>> +		tmp = tch->abs[CY_TCH_MAJ] * 100 * si->sensing_conf_data.res_x;
>>> +		tch->abs[CY_TCH_MAJ] = tmp / si->sensing_conf_data.len_x;
>>> +		tmp = tch->abs[CY_TCH_MIN] * 100 * si->sensing_conf_data.res_x;
>>> +		tch->abs[CY_TCH_MIN] = tmp / si->sensing_conf_data.len_x;
>>> +
>>> +		t = tch->abs[CY_TCH_T];
>>> +		input_mt_slot(ts->input, t);
>>> +		input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true);
>>> +		__set_bit(t, ids);
>>> +
>>> +		/* position and pressure fields */
>>> +		input_report_abs(ts->input, ABS_MT_POSITION_X,
>>> +				 tch->abs[CY_TCH_X]);
>>> +		input_report_abs(ts->input, ABS_MT_POSITION_Y,
>>> +				 tch->abs[CY_TCH_Y]);
>>> +		input_report_abs(ts->input, ABS_MT_PRESSURE,
>>> +				 tch->abs[CY_TCH_P]);
>>> +
>>> +		/* Get the extended touch fields */
>>> +		input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
>>> +				 tch->abs[CY_TCH_MAJ]);
>>> +		input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
>>> +				 tch->abs[CY_TCH_MIN]);
>>> +	}
>>> +
>>> +	cyttsp5_final_sync(ts->input, si->tch_abs[CY_TCH_T].max, ids);
>>> +
>>> +	ts->num_prv_rec = num_cur_tch;
>>> +}
>>> +
>>> +/* read xy_data for all current touches */
>>> +static int cyttsp5_xy_worker(struct cyttsp5 *ts)
>>> +{
>>> +	struct device *dev = ts->dev;
>>> +	struct cyttsp5_sysinfo *si = &ts->sysinfo;
>>> +	int max_tch = si->sensing_conf_data.max_tch;
>>> +	struct cyttsp5_touch tch;
>>> +	u8 num_cur_tch;
>>> +
>>> +	cyttsp5_get_touch_axis(&tch.hdr, si->tch_hdr.size,
>>> +			       si->tch_hdr.max,
>>> +			       si->xy_mode + 3 + si->tch_hdr.ofs,
>>> +			       si->tch_hdr.bofs);
>>> +
>>> +	num_cur_tch = tch.hdr;
>>> +	if (num_cur_tch > max_tch) {
>>> +		dev_err(dev, "Num touch err detected (n=%d)\n", num_cur_tch);
>>> +		num_cur_tch = max_tch;
>>> +	}
>>> +
>>> +	if (num_cur_tch == 0 && ts->num_prv_rec == 0)
>>> +		return 0;
>>> +
>>> +	/* extract xy_data for all currently reported touches */
>>> +	if (num_cur_tch)
>>> +		cyttsp5_get_mt_touches(ts, &tch, num_cur_tch);
>>> +	else
>>> +		cyttsp5_mt_lift_all(ts);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int cyttsp5_mt_attention(struct device *dev)
>>> +{
>>> +	struct cyttsp5 *ts = dev_get_drvdata(dev);
>>
>> Why don't you pass ts into cyttsp5_mt_attention?
> 
> Yep, you are right, I will update it.
> 
>>
>>> +	struct cyttsp5_sysinfo *si = &ts->sysinfo;
>>> +	int rc;
>>> +
>>> +	if (si->xy_mode[2] != HID_TOUCH_REPORT_ID)
>>> +		return 0;
>>> +
>>> +	/* core handles handshake */
>>> +	rc = cyttsp5_xy_worker(ts);
>>> +	if (rc < 0)
>>> +		dev_err(dev, "xy_worker error r=%d\n", rc);
>>> +
>>> +	return rc;
>>> +}
>>> +
>>> +static int cyttsp5_setup_input_device(struct device *dev)
>>> +{
>>> +	struct cyttsp5 *ts = dev_get_drvdata(dev);
>>> +	struct cyttsp5_sysinfo *si = &ts->sysinfo;
>>> +	int max_x, max_y, max_p;
>>> +	int max_x_tmp, max_y_tmp;
>>> +	int rc;
>>> +
>>> +	__set_bit(EV_ABS, ts->input->evbit);
>>> +	__set_bit(EV_REL, ts->input->evbit);
>>> +	__set_bit(EV_KEY, ts->input->evbit);
>>> +
>>> +	max_x_tmp = si->sensing_conf_data.res_x;
>>> +	max_y_tmp = si->sensing_conf_data.res_y;
>>> +	max_x = max_y_tmp - 1;
>>> +	max_y = max_x_tmp - 1;
>>> +	max_p = si->sensing_conf_data.max_z;
>>> +
>>> +	input_mt_init_slots(ts->input, si->tch_abs[CY_TCH_T].max, 0);
>>
>> Error handling.
> 
> Thanks.
> 
>>
>>> +
>>> +	__set_bit(ABS_MT_POSITION_X, ts->input->absbit);
>>> +	__set_bit(ABS_MT_POSITION_Y, ts->input->absbit);
>>> +	__set_bit(ABS_MT_PRESSURE, ts->input->absbit);
>>> +
>>> +	input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, max_x, 0, 0);
>>> +	input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, max_y, 0, 0);
>>> +	input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, max_p, 0, 0);
>>> +
>>> +	input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
>>> +	input_set_abs_params(ts->input, ABS_MT_TOUCH_MINOR, 0, MAX_AREA, 0, 0);
>>
>> You might want to use the standard DT touchscreen properties and
>> reporting functions to support axis inversion and swapping of axes.
> 
> Hm, I am not sure to see what you are referring to.
> Could you explain me what you think of?
> 
>>
>>> +
>>> +	rc = input_register_device(ts->input);
>>> +	if (rc < 0)
>>> +		dev_err(dev, "Error, failed register input device r=%d\n", rc);
>>> +
>>> +	return rc;
>>> +}
>>> +
>>> +#ifdef CONFIG_OF
>>> +static int cyttsp5_parse_dt_key_code(struct device *dev)
>>> +{
>>> +	struct cyttsp5 *ts = dev_get_drvdata(dev);
>>> +	struct cyttsp5_sysinfo *si = &ts->sysinfo;
>>> +	struct device_node *np;
>>> +	int i;
>>> +
>>> +	np = dev->of_node;
>>> +	if (!np)
>>> +		return -EINVAL;
>>> +
>>> +	if (!si->num_btns)
>>> +		return 0;
>>> +
>>> +	/* Initialize the button to RESERVED */
>>> +	for (i = 0; i < si->num_btns; i++)
>>> +		si->key_code[i] = KEY_RESERVED;
>>> +
>>> +	return of_property_read_u32_array(np, "linux,keycodes",
>>> +				   si->key_code, si->num_btns);
>>> +}
>>> +#else
>>> +static int cyttsp5_parse_dt_key_code(struct device *dev)
>>> +{
>>> +	struct cyttsp5 *ts = dev_get_drvdata(dev);
>>> +	struct cyttsp5_sysinfo *si = &ts->sysinfo;
>>> +	int i;
>>> +
>>> +	if (!si->num_btns)
>>> +		return 0;
>>> +
>>> +	/* Initialize the button to RESERVED */
>>> +	for (i = 0; i < si->num_btns; i++)
>>> +		si->key_code[i] = KEY_RESERVED;
>>> +
>>> +	return 0;
>>> +}
>>> +#endif
>>> +
>>> +static int cyttsp5_btn_attention(struct device *dev)
>>> +{
>>> +	struct cyttsp5 *ts = dev_get_drvdata(dev);
>>> +	struct cyttsp5_sysinfo *si = &ts->sysinfo;
>>> +	int cur_btn;
>>> +	int cur_btn_state;
>>> +
>>> +	if (si->xy_mode[2] != HID_BTN_REPORT_ID || !si->num_btns)
>>> +		return 0;
>>> +
>>> +	/* extract button press/release touch information */
>>> +	for (cur_btn = 0; cur_btn < si->num_btns; cur_btn++) {
>>> +		/* Get current button state */
>>> +		cur_btn_state = (si->xy_data[0] >> (cur_btn * CY_BITS_PER_BTN))
>>> +			& CY_NUM_BTN_EVENT_ID;
>>> +
>>> +		input_report_key(ts->input, si->key_code[cur_btn],
>>> +				 cur_btn_state);
>>> +		input_sync(ts->input);
>>
>> You do not need to sen sync after each button, send it once after all
>> buttons sent.
> 
> Oh, yes, I will do that!
> 
>>
>>> +	}
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static u16 cyttsp5_compute_crc(u8 *buf, u32 size)
>>> +{
>>> +	u16 remainder = 0xFFFF;
>>> +	u16 xor_mask = 0x0000;
>>> +	u32 index;
>>> +	u32 byte_value;
>>> +	u32 table_index;
>>> +	u32 crc_bit_width = sizeof(u16) * 8;
>>> +
>>> +	/* Divide the message by polynomial, via the table. */
>>> +	for (index = 0; index < size; index++) {
>>> +		byte_value = buf[index];
>>> +		table_index = ((byte_value >> 4) & 0x0F)
>>> +			^ (remainder >> (crc_bit_width - 4));
>>> +		remainder = crc_itu_t_table[table_index]
>>> +			^ (remainder << 4);
>>> +		table_index = (byte_value & 0x0F)
>>> +			^ (remainder >> (crc_bit_width - 4));
>>> +		remainder = crc_itu_t_table[table_index]
>>> +			^ (remainder << 4);
>>> +	}
>>> +
>>> +	/* Perform the final remainder CRC. */
>>> +	return remainder ^ xor_mask;
>>> +}
>>> +
>>> +static int cyttsp5_validate_cmd_response(struct cyttsp5 *ts, u8 code)
>>> +{
>>> +	u16 size, crc;
>>> +	u8 status, offset;
>>> +	int command_code;
>>> +
>>> +	size = get_unaligned_le16(&ts->response_buf[0]);
>>> +
>>> +	if (!size)
>>> +		return 0;
>>> +
>>> +	offset = ts->response_buf[HID_OUTPUT_RESPONSE_REPORT_OFFSET];
>>> +
>>> +	if (offset == HID_BL_RESPONSE_REPORT_ID) {
>>> +		if (ts->response_buf[4] != HID_OUTPUT_BL_SOP) {
>>> +			dev_err(ts->dev, "HID output response, wrong SOP\n");
>>> +			return -EPROTO;
>>> +		}
>>> +
>>> +		if (ts->response_buf[size - 1] != HID_OUTPUT_BL_EOP) {
>>> +			dev_err(ts->dev, "HID output response, wrong EOP\n");
>>> +			return -EPROTO;
>>> +		}
>>> +
>>> +		crc = cyttsp5_compute_crc(&ts->response_buf[4], size - 7);
>>> +		if (ts->response_buf[size - 3] != LOW_BYTE(crc) ||
>>> +		    ts->response_buf[size - 2] != HI_BYTE(crc)) {
>>> +			dev_err(ts->dev, "HID output response, wrong CRC 0x%X\n",
>>> +				crc);
>>> +			return -EPROTO;
>>> +		}
>>> +
>>> +		status = ts->response_buf[5];
>>> +		if (status) {
>>> +			dev_err(ts->dev, "HID output response, ERROR:%d\n",
>>> +				status);
>>> +			return -EPROTO;
>>> +		}
>>> +	}
>>> +
>>> +	if (offset == HID_APP_RESPONSE_REPORT_ID) {
>>> +		command_code = ts->response_buf[HID_OUTPUT_RESPONSE_CMD_OFFSET]
>>> +			& HID_OUTPUT_RESPONSE_CMD_MASK;
>>> +		if (command_code != code) {
>>> +			dev_err(ts->dev,
>>> +				"HID output response, wrong command_code:%X\n",
>>> +				command_code);
>>> +			return -EPROTO;
>>> +		}
>>> +	}
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static void cyttsp5_si_get_btn_data(struct cyttsp5 *ts)
>>> +{
>>> +	struct cyttsp5_sysinfo *si = &ts->sysinfo;
>>> +	int i;
>>> +	unsigned int btns = ts->response_buf[HID_SYSINFO_BTN_OFFSET]
>>> +		& HID_SYSINFO_BTN_MASK;
>>> +
>>> +	si->num_btns = 0;
>>> +	for (i = 0; i < HID_SYSINFO_MAX_BTN; i++) {
>>> +		if (btns & BIT(i))
>>> +			si->num_btns++;
>>> +	}
>>
>> 	si->num_btns = hweight8(ts->response_buf[HID_SYSINFO_BTN_OFFSET]);
> 
> Great, I will try that!
> 
>>
>>> +}
>>> +
>>> +static int cyttsp5_get_sysinfo_regs(struct cyttsp5 *ts)
>>> +{
>>> +	struct cyttsp5_sensing_conf_data *scd = &ts->sysinfo.sensing_conf_data;
>>> +	struct cyttsp5_sensing_conf_data_dev *scd_dev =
>>> +		(struct cyttsp5_sensing_conf_data_dev *)
>>> +		&ts->response_buf[HID_SYSINFO_SENSING_OFFSET];
>>> +	struct cyttsp5_sysinfo *si = &ts->sysinfo;
>>> +
>>> +	cyttsp5_si_get_btn_data(ts);
>>> +
>>> +	scd->max_tch = scd_dev->max_num_of_tch_per_refresh_cycle;
>>> +	scd->res_x = get_unaligned_le16(&scd_dev->res_x);
>>> +	scd->res_y = get_unaligned_le16(&scd_dev->res_y);
>>> +	scd->max_z = get_unaligned_le16(&scd_dev->max_z);
>>> +	scd->len_x = get_unaligned_le16(&scd_dev->len_x);
>>> +	scd->len_y = get_unaligned_le16(&scd_dev->len_y);
>>> +
>>> +	si->xy_data = devm_kzalloc(ts->dev, scd->max_tch * TOUCH_REPORT_SIZE,
>>> +				   GFP_KERNEL);
>>> +	if (!si->xy_data)
>>> +		return -ENOMEM;
>>> +
>>> +	si->xy_mode = devm_kzalloc(ts->dev, TOUCH_INPUT_HEADER_SIZE,
>>> +				   GFP_KERNEL);
>>> +	if (!si->xy_mode)
>>> +		return -ENOMEM;
>>
>> Why do we need these 2 allocated separately form the driver data?
> 
> xy_mode and particularly xy_data are used to retrieve buttons or touch
> data that we received from the input buffer (see move_button_data()
> and move_touch_data()). I guess that I can try to remove them, if you
> want.
> 
>>
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int cyttsp5_hid_output_get_sysinfo(struct cyttsp5 *ts)
>>> +{
>>> +	int rc;
>>> +	u8 cmd[HID_OUTPUT_GET_SYSINFO_SIZE];
>>> +
>>> +	ts->hid_cmd_state = HID_CMD_BUSY;
>>> +
>>> +	/* HI bytes of Output register address */
>>> +	cmd[0] = LOW_BYTE(HID_OUTPUT_GET_SYSINFO_SIZE);
>>> +	cmd[1] = HI_BYTE(HID_OUTPUT_GET_SYSINFO_SIZE);
>>> +	cmd[2] = HID_APP_OUTPUT_REPORT_ID;
>>> +	cmd[3] = 0x0; /* Reserved */
>>> +	cmd[4] = HID_OUTPUT_GET_SYSINFO;
>>> +
>>> +	rc = cyttsp5_write(ts, HID_OUTPUT_REG, cmd,
>>> +			   HID_OUTPUT_GET_SYSINFO_SIZE);
>>> +	if (rc) {
>>> +		dev_err(ts->dev, "Failed to write command %d", rc);
>>> +		goto error;
>>> +	}
>>> +
>>> +	rc = wait_event_timeout(ts->wait_q, (ts->hid_cmd_state == HID_CMD_DONE),
>>> +				msecs_to_jiffies(CY_HID_OUTPUT_GET_SYSINFO_TIMEOUT));
>>> +	if (!rc) {
>>> +		dev_err(ts->dev, "HID output cmd execution timed out\n");
>>> +		rc = -ETIME;
>>> +		goto error;
>>> +	}
>>> +
>>> +	rc = cyttsp5_validate_cmd_response(ts, HID_OUTPUT_GET_SYSINFO);
>>> +	if (rc) {
>>> +		dev_err(ts->dev, "Validation of the response failed\n");
>>> +		goto error;
>>> +	}
>>> +
>>> +	return cyttsp5_get_sysinfo_regs(ts);
>>> +
>>> +error:
>>> +	mutex_lock(&ts->system_lock);
>>> +	ts->hid_cmd_state = HID_CMD_DONE;
>>> +	mutex_unlock(&ts->system_lock);
>>> +	return rc;
>>> +}
>>> +
>>> +static int cyttsp5_hid_output_bl_launch_app(struct cyttsp5 *ts)
>>> +{
>>> +	int rc;
>>> +	u8 cmd[HID_OUTPUT_BL_LAUNCH_APP];
>>> +	u16 crc;
>>> +
>>> +	mutex_lock(&ts->system_lock);
>>> +	ts->hid_cmd_state = HID_CMD_BUSY;
>>> +	mutex_unlock(&ts->system_lock);
>>> +
>>> +	cmd[0] = LOW_BYTE(HID_OUTPUT_BL_LAUNCH_APP_SIZE);
>>> +	cmd[1] = HI_BYTE(HID_OUTPUT_BL_LAUNCH_APP_SIZE);
>>> +	cmd[2] = HID_BL_OUTPUT_REPORT_ID;
>>> +	cmd[3] = 0x0; /* Reserved */
>>> +	cmd[4] = HID_OUTPUT_BL_SOP;
>>> +	cmd[5] = HID_OUTPUT_BL_LAUNCH_APP;
>>> +	cmd[6] = 0x0; /* Low bytes of data */
>>> +	cmd[7] = 0x0; /* Hi bytes of data */
>>> +	crc = cyttsp5_compute_crc(&cmd[4], 4);
>>> +	cmd[8] = LOW_BYTE(crc);
>>> +	cmd[9] = HI_BYTE(crc);
>>> +	cmd[10] = HID_OUTPUT_BL_EOP;
>>> +
>>> +	rc = cyttsp5_write(ts, HID_OUTPUT_REG, cmd,
>>> +			   HID_OUTPUT_BL_LAUNCH_APP_SIZE);
>>> +	if (rc) {
>>> +		dev_err(ts->dev, "Failed to write command %d", rc);
>>> +		goto error;
>>> +	}
>>> +
>>> +	rc = wait_event_timeout(ts->wait_q, (ts->hid_cmd_state == HID_CMD_DONE),
>>> +				msecs_to_jiffies(CY_HID_OUTPUT_TIMEOUT));
>>> +	if (!rc) {
>>> +		dev_err(ts->dev, "HID output cmd execution timed out\n");
>>> +		rc = -ETIME;
>>> +		goto error;
>>> +	}
>>> +
>>> +	rc = cyttsp5_validate_cmd_response(ts, HID_OUTPUT_BL_LAUNCH_APP);
>>> +	if (rc) {
>>> +		dev_err(ts->dev, "Validation of the response failed\n");
>>> +		goto error;
>>> +	}
>>> +
>>> +	return rc;
>>> +
>>> +error:
>>> +	mutex_lock(&ts->system_lock);
>>> +	ts->hid_cmd_state = HID_CMD_DONE;
>>> +	mutex_unlock(&ts->system_lock);
>>> +
>>> +	return rc;
>>> +}
>>> +
>>> +static int cyttsp5_get_hid_descriptor(struct cyttsp5 *ts,
>>> +				      struct cyttsp5_hid_desc *desc)
>>> +{
>>> +	struct device *dev = ts->dev;
>>> +	__le16 hid_desc_register = HID_DESC_REG;
>>> +	int rc;
>>> +	u8 cmd[2];
>>> +
>>> +	/* Read HID descriptor length and version */
>>> +	mutex_lock(&ts->system_lock);
>>> +	ts->hid_cmd_state = HID_CMD_BUSY;
>>> +	mutex_unlock(&ts->system_lock);
>>> +
>>> +	/* Set HID descriptor register */
>>> +	memcpy(cmd, &hid_desc_register, sizeof(hid_desc_register));
>>> +
>>> +	rc = cyttsp5_write(ts, HID_DESC_REG, NULL, 0);
>>> +	if (rc < 0) {
>>> +		dev_err(dev, "Failed to get HID descriptor, rc=%d\n", rc);
>>> +		goto error;
>>> +	}
>>> +
>>> +	rc = wait_event_timeout(ts->wait_q, (ts->hid_cmd_state == HID_CMD_DONE),
>>> +				msecs_to_jiffies(CY_HID_GET_HID_DESCRIPTOR_TIMEOUT));
>>> +	if (!rc) {
>>> +		dev_err(ts->dev, "HID get descriptor timed out\n");
>>> +		rc = -ETIME;
>>> +		goto error;
>>> +	}
>>> +
>>> +	memcpy(desc, ts->response_buf, sizeof(struct cyttsp5_hid_desc));
>>> +
>>> +	/* Check HID descriptor length and version */
>>> +	if (le16_to_cpu(desc->hid_desc_len) != sizeof(*desc) ||
>>> +	    le16_to_cpu(desc->bcd_version) != HID_VERSION) {
>>> +		dev_err(dev, "Unsupported HID version\n");
>>> +		return -ENODEV;
>>> +	}
>>> +
>>> +	goto exit;
>>> +
>>> +error:
>>> +	mutex_lock(&ts->system_lock);
>>> +	ts->hid_cmd_state = HID_CMD_DONE;
>>> +	mutex_unlock(&ts->system_lock);
>>> +exit:
>>> +	return rc;
>>> +}
>>> +
>>> +static int fill_tch_abs(struct cyttsp5_tch_abs_params *tch_abs, int report_size,
>>> +			int offset)
>>> +{
>>> +	tch_abs->ofs = offset / 8;
>>> +	tch_abs->size = report_size / 8;
>>> +	if (report_size % 8)
>>> +		tch_abs->size += 1;
>>> +	tch_abs->min = 0;
>>> +	tch_abs->max = 1 << report_size;
>>> +	tch_abs->bofs = offset - (tch_abs->ofs << 3);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int move_button_data(struct cyttsp5 *ts, struct cyttsp5_sysinfo *si)
>>> +{
>>> +	memcpy(si->xy_mode, ts->input_buf, BTN_INPUT_HEADER_SIZE);
>>> +	memcpy(si->xy_data, &ts->input_buf[BTN_INPUT_HEADER_SIZE],
>>> +	       BTN_REPORT_SIZE);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int move_touch_data(struct cyttsp5 *ts, struct cyttsp5_sysinfo *si)
>>> +{
>>> +	int max_tch = si->sensing_conf_data.max_tch;
>>> +	int num_cur_tch;
>>> +	int length;
>>> +	struct cyttsp5_tch_abs_params *tch = &si->tch_hdr;
>>> +
>>> +	memcpy(si->xy_mode, ts->input_buf, TOUCH_INPUT_HEADER_SIZE);
>>> +
>>> +	cyttsp5_get_touch_axis(&num_cur_tch, tch->size,
>>> +			       tch->max, si->xy_mode + 3 + tch->ofs, tch->bofs);
>>> +	if (unlikely(num_cur_tch > max_tch))
>>> +		num_cur_tch = max_tch;
>>> +
>>> +	length = num_cur_tch * TOUCH_REPORT_SIZE;
>>> +
>>> +	memcpy(si->xy_data, &ts->input_buf[TOUCH_INPUT_HEADER_SIZE], length);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static irqreturn_t cyttsp5_handle_irq(int irq, void *handle)
>>> +{
>>> +	struct cyttsp5 *ts = handle;
>>> +	int report_id;
>>> +	int size;
>>> +	int rc;
>>> +
>>> +	rc = cyttsp5_read(ts, ts->input_buf, CY_MAX_INPUT);
>>> +	if (rc)
>>> +		return IRQ_HANDLED;
>>> +
>>> +	size = get_unaligned_le16(&ts->input_buf[0]);
>>> +
>>> +	/* check reset */
>>> +	if (size == 0) {
>>> +		memcpy(ts->response_buf, ts->input_buf, 2);
>>> +
>>> +		mutex_lock(&ts->system_lock);
>>> +		ts->hid_cmd_state = HID_CMD_DONE;
>>> +		mutex_unlock(&ts->system_lock);
>>> +		wake_up(&ts->wait_q);
>>
>> I'd use spinlock in wait queue and wake_up_locked() instead of a
>> separate mutex.
> 
> Hum, okay, I will try that.
> 
>>
>>> +		return IRQ_HANDLED;
>>> +	}
>>> +
>>> +	report_id = ts->input_buf[2];
>>> +
>>
>> 	switch(report_id) {
>> 	}
> 
> Yep, it will be easier to understand.
> 
>>
>>> +	if (report_id == HID_TOUCH_REPORT_ID) {
>>> +		move_touch_data(ts, &ts->sysinfo);
>>> +		cyttsp5_mt_attention(ts->dev);
>>> +	} else if (report_id == HID_BTN_REPORT_ID) {
>>> +		move_button_data(ts, &ts->sysinfo);
>>> +		cyttsp5_btn_attention(ts->dev);
>>> +	} else {
>>> +		/* It is not an input but a command response */
>>> +		memcpy(ts->response_buf, ts->input_buf, size);
>>> +
>>> +		mutex_lock(&ts->system_lock);
>>> +		ts->hid_cmd_state = HID_CMD_DONE;
>>> +		mutex_unlock(&ts->system_lock);
>>> +		wake_up(&ts->wait_q);
>>> +	}
>>> +
>>> +	return IRQ_HANDLED;
>>> +}
>>> +
>>> +static int cyttsp5_deassert_int(struct cyttsp5 *ts)
>>> +{
>>> +	u16 size;
>>> +	u8 buf[2];
>>> +	int rc;
>>> +
>>> +	rc = regmap_bulk_read(ts->regmap, HID_INPUT_REG, buf, 2);
>>> +	if (rc < 0)
>>> +		return rc;
>>> +
>>> +	size = get_unaligned_le16(&buf[0]);
>>> +	if (size == 2 || size == 0)
>>> +		return 0;
>>> +
>>> +	return -EINVAL;
>>> +}
>>> +
>>> +static int cyttsp5_fill_all_touch(struct cyttsp5 *ts)
>>> +{
>>> +	struct cyttsp5_sysinfo *si = &ts->sysinfo;
>>> +
>>> +	fill_tch_abs(&si->tch_abs[CY_TCH_X], REPORT_SIZE_16,
>>> +		     TOUCH_REPORT_DESC_X);
>>> +	fill_tch_abs(&si->tch_abs[CY_TCH_Y], REPORT_SIZE_16,
>>> +		     TOUCH_REPORT_DESC_Y);
>>> +	fill_tch_abs(&si->tch_abs[CY_TCH_P], REPORT_SIZE_8,
>>> +		     TOUCH_REPORT_DESC_P);
>>> +	fill_tch_abs(&si->tch_abs[CY_TCH_T], REPORT_SIZE_5,
>>> +		     TOUCH_REPORT_DESC_CONTACTID);
>>> +	fill_tch_abs(&si->tch_hdr, REPORT_SIZE_5,
>>> +		     TOUCH_REPORT_DESC_HDR_CONTACTCOUNT);
>>> +	fill_tch_abs(&si->tch_abs[CY_TCH_MAJ], REPORT_SIZE_8,
>>> +		     TOUCH_REPORT_DESC_MAJ);
>>> +	fill_tch_abs(&si->tch_abs[CY_TCH_MIN], REPORT_SIZE_8,
>>> +		     TOUCH_REPORT_DESC_MIN);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int cyttsp5_startup(struct cyttsp5 *ts)
>>> +{
>>> +	int rc;
>>> +
>>> +	rc = cyttsp5_deassert_int(ts);
>>> +	if (rc) {
>>> +		dev_err(ts->dev, "Error on deassert int r=%d\n", rc);
>>> +		return -ENODEV;
>>> +	}
>>> +
>>> +	/*
>>> +	 * Launch the application as the device starts in bootloader mode
>>> +	 * because of a power-on-reset
>>> +	 */
>>> +	rc = cyttsp5_hid_output_bl_launch_app(ts);
>>> +	if (rc < 0) {
>>> +		dev_err(ts->dev, "Error on launch app r=%d\n", rc);
>>> +		return rc;
>>> +	}
>>> +
>>> +	rc = cyttsp5_get_hid_descriptor(ts, &ts->hid_desc);
>>> +	if (rc < 0) {
>>> +		dev_err(ts->dev, "Error on getting HID descriptor r=%d\n", rc);
>>> +		return rc;
>>> +	}
>>> +
>>> +	rc = cyttsp5_fill_all_touch(ts);
>>> +	if (rc < 0) {
>>> +		dev_err(ts->dev, "Error on report descriptor r=%d\n", rc);
>>> +		return rc;
>>> +	}
>>> +
>>> +	rc = cyttsp5_hid_output_get_sysinfo(ts);
>>> +	if (rc) {
>>> +		dev_err(ts->dev, "Error on getting sysinfo r=%d\n", rc);
>>> +		return rc;
>>> +	}
>>> +
>>> +	return rc;
>>> +}
>>> +
>>> +#ifdef CONFIG_OF
>>> +static const struct of_device_id cyttsp5_of_match[] = {
>>> +	{ .compatible = "cypress,cyttsp5", },
>>> +	{ }
>>> +};
>>> +MODULE_DEVICE_TABLE(of, cyttsp5_of_match);
>>> +#endif
>>> +
>>> +static const struct i2c_device_id cyttsp5_i2c_id[] = {
>>> +	{ CYTTSP5_NAME, 0, },
>>> +	{ }
>>> +};
>>> +MODULE_DEVICE_TABLE(i2c, cyttsp5_i2c_id);
>>> +
>>> +static int cyttsp5_probe(struct device *dev, struct regmap *regmap, int irq,
>>> +			 const char *name)
>>> +{
>>> +	struct cyttsp5 *ts;
>>> +	struct cyttsp5_sysinfo *si;
>>> +	int rc = 0, i;
>>> +
>>> +	ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
>>> +	if (!ts)
>>> +		return -ENOMEM;
>>> +
>>> +	/* Initialize device info */
>>> +	ts->regmap = regmap;
>>> +	ts->dev = dev;
>>> +	si = &ts->sysinfo;
>>> +	dev_set_drvdata(dev, ts);
>>> +
>>> +	/* Initialize mutexes and spinlocks */
>>> +	mutex_init(&ts->system_lock);
>>> +
>>> +	/* Initialize wait queue */
>>> +	init_waitqueue_head(&ts->wait_q);
>>> +
>>> +	/* Reset the gpio to be in a reset state */
>>> +	ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
>>> +	if (IS_ERR(ts->reset_gpio)) {
>>> +		rc = PTR_ERR(ts->reset_gpio);
>>> +		dev_err(dev, "Failed to request reset gpio, error %d\n", rc);
>>> +		return rc;
>>> +	}
>>> +	gpiod_set_value(ts->reset_gpio, 1);
>>
>> Why not request it as GPIOD_OUT_HIGH if you going to activate it
>> immediately? However it sounds as if you have a reset line that is
>> active low and you want to driver it low to reset, and then release. In
>> this case you need to do
>>
>> 	ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
>> 	<delay> - chip usually needs to be some time in reset state
>> 	gpiod_set_value(ts->reset_gpio, 0);
>>
>> and make sure that correct polarity is specified in device tree.
> 
> Okay, I will update it too.
> 
>>
>>> +
>>> +	/* Need a delay to have device up */
>>> +	msleep(20);
>>> +
>>> +	rc = devm_request_threaded_irq(dev, irq, NULL, cyttsp5_handle_irq,
>>> +				       IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
>>
>> Just use IRQF_ONESHOT and make sure DTS specifies interrupt properly.
>> BTW,I'd recommend using level, not edge interrupts. It is so easy to
>> miss an edge.
> 
> Okay, thank you for the advice.
> 
>>
>>> +				       name, ts);
>>> +	if (rc) {
>>> +		dev_err(dev, "unable to request IRQ\n");
>>> +		return rc;
>>> +	}
>>> +
>>> +	rc = cyttsp5_startup(ts);
>>> +	if (rc) {
>>> +		dev_err(ts->dev, "Fail initial startup r=%d\n", rc);
>>> +		return rc;
>>> +	}
>>> +
>>> +	rc = cyttsp5_parse_dt_key_code(dev);
>>> +	if (rc < 0) {
>>> +		dev_err(ts->dev, "Error while parsing dts %d\n", rc);
>>> +		return rc;
>>> +	}
>>> +
>>> +	ts->input = devm_input_allocate_device(dev);
>>> +	if (!ts->input) {
>>> +		dev_err(dev, "Error, failed to allocate input device\n");
>>> +		return -ENODEV;
>>> +	}
>>> +
>>> +	ts->input->name = "cyttsp5";
>>> +	scnprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
>>> +	ts->input->phys = ts->phys;
>>> +	ts->input->dev.parent = ts->dev;
>>> +	input_set_drvdata(ts->input, ts);
>>> +
>>> +	touchscreen_parse_properties(ts->input, true, NULL);
>>> +
>>> +	__set_bit(EV_KEY, ts->input->evbit);
>>> +	for (i = 0; i < si->num_btns; i++)
>>> +		__set_bit(si->key_code[i], ts->input->keybit);
>>> +
>>> +	return cyttsp5_setup_input_device(dev);
>>> +}
>>> +
>>> +static int cyttsp5_i2c_probe(struct i2c_client *client,
>>> +			     const struct i2c_device_id *id)
>>> +{
>>> +	struct regmap *regmap;
>>> +	static const struct regmap_config config = {
>>> +		.reg_bits = 8,
>>> +		.val_bits = 8,
>>> +	};
>>> +
>>> +	regmap = devm_regmap_init_i2c(client, &config);
>>> +	if (IS_ERR(regmap)) {
>>> +		dev_err(&client->dev, "regmap allocation failed: %ld\n",
>>> +			PTR_ERR(regmap));
>>> +		return PTR_ERR(regmap);
>>> +	}
>>> +
>>> +	return cyttsp5_probe(&client->dev, regmap, client->irq, client->name);
>>> +}
>>> +
>>> +static int cyttsp5_remove(struct device *dev)
>>> +{
>>> +	struct cyttsp5 *ts = dev_get_drvdata(dev);
>>> +
>>> +	input_unregister_device(ts->input);
>>
>> Not needed: you are using managed input device.
> 
> You are right, thanks.
> 
>>
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int cyttsp5_i2c_remove(struct i2c_client *client)
>>> +{
>>> +	struct device *dev = &client->dev;
>>> +
>>> +	return cyttsp5_remove(dev);
>>
>> Not needed if you remove cyttsp5_remove().
> 
> Sure.
> 
>>
>>> +}
>>> +
>>> +static struct i2c_driver cyttsp5_i2c_driver = {
>>> +	.driver = {
>>> +		.name = CYTTSP5_NAME,
>>> +		.owner = THIS_MODULE,
>>> +		.of_match_table = of_match_ptr(cyttsp5_of_match),
>>> +	},
>>> +	.probe = cyttsp5_i2c_probe,
>>> +	.remove = cyttsp5_i2c_remove,
>>> +	.id_table = cyttsp5_i2c_id,
>>> +};
>>> +
>>> +module_i2c_driver(cyttsp5_i2c_driver);
>>> +
>>> +MODULE_LICENSE("GPL");
>>> +MODULE_DESCRIPTION("Touchscreen driver for Cypress TrueTouch Gen 5 Product");
>>> +MODULE_AUTHOR("Mylène Josserand <mylene.josserand@free-electrons.com>");
>>> -- 
>>> 2.11.0
>>>    
>>
>> Thanks.
>>
> 
> Best regards,
>