// SPDX-License-Identifier: GPL-2.0
/*
* Parade TrueTouch(TM) Standard Product V5 Module.
*
* Copyright (C) 2015 Parade Technologies
* Copyright (C) 2012-2015 Cypress Semiconductor
* Copyright (C) 2018 Bootlin
*
* Authors: Mylène Josserand <[email protected]>
* Alistair Francis <[email protected]>
*/
#include <linux/crc-itu-t.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/unaligned.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 GENMASK(CY_BITS_PER_BTN - 1, 0)
#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_OUTPUT_MAX_CMD_SIZE 12
#define HID_DESC_REG 0x1
#define HID_INPUT_REG 0x3
#define HID_OUTPUT_REG 0x4
#define HID_COMMAND_REG 0x5
#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_RESPONSE_REPORT_ID 0xF0
#define HID_OUTPUT_RESPONSE_REPORT_OFFSET 2
#define HID_OUTPUT_RESPONSE_CMD_OFFSET 4
#define HID_OUTPUT_RESPONSE_CMD_MASK GENMASK(6, 0)
#define HID_SYSINFO_SENSING_OFFSET 33
#define HID_SYSINFO_BTN_OFFSET 48
#define HID_SYSINFO_BTN_MASK GENMASK(7, 0)
#define HID_SYSINFO_MAX_BTN 8
#define HID_CMD_SET_POWER 0x8
#define HID_POWER_ON 0x0
#define HID_POWER_SLEEP 0x1
#define CY_HID_OUTPUT_TIMEOUT_MS 200
#define CY_HID_OUTPUT_GET_SYSINFO_TIMEOUT_MS 3000
#define CY_HID_GET_HID_DESCRIPTOR_TIMEOUT_MS 4000
#define CY_HID_SET_POWER_TIMEOUT 500
/* 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
#define MAX_CY_TCH_T_IDS 32
/* 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
#define SET_CMD_LOW(byte, bits) \
((byte) = (((byte) & 0xF0) | ((bits) & 0x0F)))
#define SET_CMD_HIGH(byte, bits)\
((byte) = (((byte) & 0x0F) | ((bits) & 0xF0)))
#define SET_CMD_OPCODE(byte, opcode) SET_CMD_LOW(byte, opcode)
#define SET_CMD_REPORT_TYPE(byte, type) SET_CMD_HIGH(byte, ((type) << 4))
#define SET_CMD_REPORT_ID(byte, id) SET_CMD_LOW(byte, id)
/* 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 panel_id;
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 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 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];
};
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 completion cmd_done;
struct cyttsp5_sysinfo sysinfo;
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;
struct touchscreen_properties prop;
struct regulator_bulk_data supplies[2];
};
/*
* For what is understood in the datasheet, the register does not
* matter. For consistency, use 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 error;
u32 size;
u8 temp[2];
/* Read the frame to retrieve the size */
error = regmap_bulk_read(ts->regmap, HID_INPUT_REG, temp, sizeof(temp));
if (error)
return error;
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[HID_OUTPUT_MAX_CMD_SIZE];
if (size + 1 > HID_OUTPUT_MAX_CMD_SIZE)
return -E2BIG;
/* High bytes of register address needed as first byte of cmd */
cmd[0] = (reg >> 8) & 0xFF;
/* Copy the rest of the data */
if (data)
memcpy(&cmd[1], data, size);
/*
* The hardware wants to receive a frame with the address register
* contained 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, reg & 0xFF, cmd, size + 1);
}
static void cyttsp5_get_touch_axis(int *axis, int size, int max, u8 *xy_data,
int bofs)
{
int nbyte;
for (nbyte = 0, *axis = 0; nbyte < size; nbyte++)
*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, offset = 0;
DECLARE_BITMAP(ids, MAX_CY_TCH_T_IDS);
u8 *tch_addr;
int tmp;
bitmap_zero(ids, MAX_CY_TCH_T_IDS);
memset(tch->abs, 0, sizeof(tch->abs));
switch (ts->input_buf[2]) {
case HID_TOUCH_REPORT_ID:
offset = TOUCH_INPUT_HEADER_SIZE;
break;
case HID_BTN_REPORT_ID:
offset = BTN_INPUT_HEADER_SIZE;
break;
}
for (i = 0; i < num_cur_tch; i++) {
tch_addr = ts->input_buf + offset + (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 */
touchscreen_report_pos(ts->input, &ts->prop,
tch->abs[CY_TCH_X], tch->abs[CY_TCH_Y],
true);
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]);
}
ts->num_prv_rec = num_cur_tch;
}
static int cyttsp5_mt_attention(struct device *dev)
{
struct cyttsp5 *ts = dev_get_drvdata(dev);
struct cyttsp5_sysinfo *si = &ts->sysinfo;
int max_tch = si->sensing_conf_data.max_tch;
struct cyttsp5_touch tch;
int num_cur_tch;
cyttsp5_get_touch_axis(&num_cur_tch, si->tch_hdr.size,
si->tch_hdr.max,
ts->input_buf + 3 + si->tch_hdr.ofs,
si->tch_hdr.bofs);
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);
input_mt_sync_frame(ts->input);
input_sync(ts->input);
return 0;
}
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 error;
max_x_tmp = si->sensing_conf_data.res_x;
max_y_tmp = si->sensing_conf_data.res_y;
max_x = max_x_tmp - 1;
max_y = max_y_tmp - 1;
max_p = si->sensing_conf_data.max_z;
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);
error = input_mt_init_slots(ts->input, si->tch_abs[CY_TCH_T].max,
INPUT_MT_DROP_UNUSED | INPUT_MT_DIRECT);
if (error)
return error;
error = input_register_device(ts->input);
if (error) {
dev_err(dev, "failed to register input device: %d\n", error);
return error;
}
return error;
}
static int cyttsp5_parse_dt_key_code(struct device *dev)
{
struct cyttsp5 *ts = dev_get_drvdata(dev);
struct cyttsp5_sysinfo *si = &ts->sysinfo;
if (!si->num_btns)
return 0;
/* Initialize the button to RESERVED */
memset32(si->key_code, KEY_RESERVED, si->num_btns);
return device_property_read_u32_array(dev, "linux,keycodes",
si->key_code, si->num_btns);
}
static int cyttsp5_btn_attention(struct device *dev)
{
struct cyttsp5 *ts = dev_get_drvdata(dev);
struct cyttsp5_sysinfo *si = &ts->sysinfo;
int cur_btn, offset = 0;
int cur_btn_state;
switch (ts->input_buf[2]) {
case HID_TOUCH_REPORT_ID:
offset = TOUCH_INPUT_HEADER_SIZE;
break;
case HID_BTN_REPORT_ID:
offset = BTN_INPUT_HEADER_SIZE;
break;
}
if (ts->input_buf[2] != HID_BTN_REPORT_ID)
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 = (ts->input_buf[offset] >> (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);
}
return 0;
}
static int cyttsp5_validate_cmd_response(struct cyttsp5 *ts, u8 code)
{
u16 size, crc;
u8 status, report_id;
int command_code;
size = get_unaligned_le16(&ts->response_buf[0]);
if (!size)
return 0;
report_id = ts->response_buf[HID_OUTPUT_RESPONSE_REPORT_OFFSET];
switch (report_id) {
case 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 = crc_itu_t(0xFFFF, &ts->response_buf[4], size - 7);
if (get_unaligned_le16(&ts->response_buf[size - 3]) != 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;
}
break;
case 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;
}
break;
}
return 0;
}
static void cyttsp5_si_get_btn_data(struct cyttsp5 *ts)
{
struct cyttsp5_sysinfo *si = &ts->sysinfo;
unsigned int btns = ts->response_buf[HID_SYSINFO_BTN_OFFSET] &
HID_SYSINFO_BTN_MASK;
si->num_btns = hweight8(btns);
}
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];
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);
return 0;
}
static int cyttsp5_hid_output_get_sysinfo(struct cyttsp5 *ts)
{
int rc;
u8 cmd[HID_OUTPUT_GET_SYSINFO_SIZE];
/* HI bytes of Output register address */
put_unaligned_le16(HID_OUTPUT_GET_SYSINFO_SIZE, cmd);
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);
return rc;
}
rc = wait_for_completion_interruptible_timeout(&ts->cmd_done,
msecs_to_jiffies(CY_HID_OUTPUT_GET_SYSINFO_TIMEOUT_MS));
if (rc <= 0) {
dev_err(ts->dev, "HID output cmd execution timed out\n");
rc = -ETIMEDOUT;
return rc;
}
rc = cyttsp5_validate_cmd_response(ts, HID_OUTPUT_GET_SYSINFO);
if (rc) {
dev_err(ts->dev, "Validation of the response failed\n");
return rc;
}
return cyttsp5_get_sysinfo_regs(ts);
}
static int cyttsp5_power_control(struct cyttsp5 *ts, bool on)
{
u8 state = on ? HID_POWER_ON : HID_POWER_SLEEP;
u8 cmd[2] = { 0 };
int rc;
SET_CMD_REPORT_TYPE(cmd[0], 0);
SET_CMD_REPORT_ID(cmd[0], HID_POWER_SLEEP);
SET_CMD_OPCODE(cmd[1], HID_CMD_SET_POWER);
rc = cyttsp5_write(ts, HID_COMMAND_REG, cmd, sizeof(cmd));
if (rc) {
dev_err(ts->dev, "Failed to write power command %d", rc);
return rc;
}
rc = wait_for_completion_interruptible_timeout(&ts->cmd_done,
msecs_to_jiffies(CY_HID_SET_POWER_TIMEOUT));
if (rc <= 0) {
dev_err(ts->dev, "HID power cmd execution timed out\n");
return -ETIMEDOUT;
}
if (ts->response_buf[2] != HID_RESPONSE_REPORT_ID ||
(ts->response_buf[3] & 0x03) != state ||
(ts->response_buf[4] & 0x0f) != HID_CMD_SET_POWER) {
dev_err(ts->dev, "Validation of the %s response failed\n",
on ? "wakeup" : "sleep");
return -EINVAL;
}
return 0;
}
static int cyttsp5_hid_output_bl_launch_app(struct cyttsp5 *ts)
{
int rc;
u8 cmd[HID_OUTPUT_BL_LAUNCH_APP_SIZE];
u16 crc;
put_unaligned_le16(HID_OUTPUT_BL_LAUNCH_APP_SIZE, cmd);
cmd[2] = HID_BL_OUTPUT_REPORT_ID;
cmd[3] = 0x0; /* Reserved */
cmd[4] = HID_OUTPUT_BL_SOP;
cmd[5] = HID_OUTPUT_BL_LAUNCH_APP;
put_unaligned_le16(0x00, &cmd[6]);
crc = crc_itu_t(0xFFFF, &cmd[4], 4);
put_unaligned_le16(crc, &cmd[8]);
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);
return rc;
}
rc = wait_for_completion_interruptible_timeout(&ts->cmd_done,
msecs_to_jiffies(CY_HID_OUTPUT_TIMEOUT_MS));
if (rc <= 0) {
dev_err(ts->dev, "HID output cmd execution timed out\n");
rc = -ETIMEDOUT;
return rc;
}
rc = cyttsp5_validate_cmd_response(ts, HID_OUTPUT_BL_LAUNCH_APP);
if (rc) {
dev_err(ts->dev, "Validation of the response failed\n");
return rc;
}
return 0;
}
static int cyttsp5_get_hid_descriptor(struct cyttsp5 *ts,
struct cyttsp5_hid_desc *desc)
{
struct device *dev = ts->dev;
int rc;
rc = cyttsp5_write(ts, HID_DESC_REG, NULL, 0);
if (rc) {
dev_err(dev, "Failed to get HID descriptor, rc=%d\n", rc);
return rc;
}
rc = wait_for_completion_interruptible_timeout(&ts->cmd_done,
msecs_to_jiffies(CY_HID_GET_HID_DESCRIPTOR_TIMEOUT_MS));
if (rc <= 0) {
dev_err(ts->dev, "HID get descriptor timed out\n");
rc = -ETIMEDOUT;
return rc;
}
memcpy(desc, ts->response_buf, sizeof(*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;
}
return 0;
}
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 irqreturn_t cyttsp5_handle_irq(int irq, void *handle)
{
struct cyttsp5 *ts = handle;
int report_id;
int size;
int error;
error = cyttsp5_read(ts, ts->input_buf, CY_MAX_INPUT);
if (error)
return IRQ_HANDLED;
size = get_unaligned_le16(&ts->input_buf[0]);
if (size == 0) {
/* reset */
report_id = 0;
size = 2;
} else {
report_id = ts->input_buf[2];
}
switch (report_id) {
case HID_TOUCH_REPORT_ID:
cyttsp5_mt_attention(ts->dev);
break;
case HID_BTN_REPORT_ID:
cyttsp5_btn_attention(ts->dev);
break;
case HID_RESPONSE_REPORT_ID:
memcpy(ts->response_buf, ts->input_buf, size);
complete(&ts->cmd_done);
break;
default:
/* It is not an input but a command response */
memcpy(ts->response_buf, ts->input_buf, size);
complete(&ts->cmd_done);
}
return IRQ_HANDLED;
}
static int cyttsp5_deassert_int(struct cyttsp5 *ts)
{
u16 size;
u8 buf[2];
int error;
error = regmap_bulk_read(ts->regmap, HID_INPUT_REG, buf, sizeof(buf));
if (error < 0)
return error;
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 error;
error = cyttsp5_deassert_int(ts);
if (error) {
dev_err(ts->dev, "Error on deassert int r=%d\n", error);
return -ENODEV;
}
/*
* Launch the application as the device starts in bootloader mode
* because of a power-on-reset
*/
error = cyttsp5_hid_output_bl_launch_app(ts);
if (error < 0) {
dev_err(ts->dev, "Error on launch app r=%d\n", error);
return error;
}
error = cyttsp5_get_hid_descriptor(ts, &ts->hid_desc);
if (error < 0) {
dev_err(ts->dev, "Error on getting HID descriptor r=%d\n", error);
return error;
}
error = cyttsp5_fill_all_touch(ts);
if (error < 0) {
dev_err(ts->dev, "Error on report descriptor r=%d\n", error);
return error;
}
error = cyttsp5_hid_output_get_sysinfo(ts);
if (error) {
dev_err(ts->dev, "Error on getting sysinfo r=%d\n", error);
return error;
}
return error;
}
static void cyttsp5_cleanup(void *data)
{
struct cyttsp5 *ts = data;
regulator_bulk_disable(ARRAY_SIZE(ts->supplies), ts->supplies);
}
static int cyttsp5_probe(struct device *dev, struct regmap *regmap, int irq,
const char *name)
{
struct cyttsp5 *ts;
struct cyttsp5_sysinfo *si;
int error, 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);
init_completion(&ts->cmd_done);
/* Power up the device */
ts->supplies[0].supply = "vdd";
ts->supplies[1].supply = "vddio";
error = devm_regulator_bulk_get(dev, ARRAY_SIZE(ts->supplies),
ts->supplies);
if (error) {
dev_err(ts->dev, "Failed to get regulators, error %d\n", error);
return error;
}
error = devm_add_action_or_reset(dev, cyttsp5_cleanup, ts);
if (error)
return error;
error = regulator_bulk_enable(ARRAY_SIZE(ts->supplies), ts->supplies);
if (error) {
dev_err(ts->dev, "Failed to enable regulators, error %d\n", error);
return error;
}
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;
input_set_drvdata(ts->input, ts);
/* Reset the gpio to be in a reset state */
ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(ts->reset_gpio)) {
error = PTR_ERR(ts->reset_gpio);
dev_err(dev, "Failed to request reset gpio, error %d\n", error);
return error;
}
gpiod_set_value_cansleep(ts->reset_gpio, 0);
/* Need a delay to have device up */
msleep(20);
error = devm_request_threaded_irq(dev, irq, NULL, cyttsp5_handle_irq,
IRQF_ONESHOT, name, ts);
if (error) {
dev_err(dev, "unable to request IRQ\n");
return error;
}
error = cyttsp5_startup(ts);
if (error) {
dev_err(ts->dev, "Fail initial startup r=%d\n", error);
return error;
}
error = cyttsp5_parse_dt_key_code(dev);
if (error < 0) {
dev_err(ts->dev, "Error while parsing dts %d\n", error);
return error;
}
touchscreen_parse_properties(ts->input, true, &ts->prop);
__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)
{
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 const struct of_device_id cyttsp5_of_match[] = {
{ .compatible = "cypress,tt21000", },
{ }
};
MODULE_DEVICE_TABLE(of, cyttsp5_of_match);
static const struct i2c_device_id cyttsp5_i2c_id[] = {
{ CYTTSP5_NAME },
{ }
};
MODULE_DEVICE_TABLE(i2c, cyttsp5_i2c_id);
static int __maybe_unused cyttsp5_suspend(struct device *dev)
{
struct cyttsp5 *ts = dev_get_drvdata(dev);
if (!device_may_wakeup(dev))
cyttsp5_power_control(ts, false);
return 0;
}
static int __maybe_unused cyttsp5_resume(struct device *dev)
{
struct cyttsp5 *ts = dev_get_drvdata(dev);
if (!device_may_wakeup(dev))
cyttsp5_power_control(ts, true);
return 0;
}
static SIMPLE_DEV_PM_OPS(cyttsp5_pm, cyttsp5_suspend, cyttsp5_resume);
static struct i2c_driver cyttsp5_i2c_driver = {
.driver = {
.name = CYTTSP5_NAME,
.of_match_table = cyttsp5_of_match,
.pm = &cyttsp5_pm,
},
.probe = cyttsp5_i2c_probe,
.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 <[email protected]>");
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