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linuxdebug/drivers/input/touchscreen/goodix.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for Goodix Touchscreens
*
* Copyright (c) 2014 Red Hat Inc.
* Copyright (c) 2015 K. Merker <merker@debian.org>
*
* This code is based on gt9xx.c authored by andrew@goodix.com:
*
* 2010 - 2012 Goodix Technology.
*/
#include <linux/kernel.h>
#include <linux/dmi.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/platform_data/x86/soc.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/of.h>
#include <asm/unaligned.h>
#include "goodix.h"
#define GOODIX_GPIO_INT_NAME "irq"
#define GOODIX_GPIO_RST_NAME "reset"
#define GOODIX_MAX_HEIGHT 4096
#define GOODIX_MAX_WIDTH 4096
#define GOODIX_INT_TRIGGER 1
#define GOODIX_CONTACT_SIZE 8
#define GOODIX_MAX_CONTACT_SIZE 9
#define GOODIX_MAX_CONTACTS 10
#define GOODIX_CONFIG_MIN_LENGTH 186
#define GOODIX_CONFIG_911_LENGTH 186
#define GOODIX_CONFIG_967_LENGTH 228
#define GOODIX_CONFIG_GT9X_LENGTH 240
#define GOODIX_BUFFER_STATUS_READY BIT(7)
#define GOODIX_HAVE_KEY BIT(4)
#define GOODIX_BUFFER_STATUS_TIMEOUT 20
#define RESOLUTION_LOC 1
#define MAX_CONTACTS_LOC 5
#define TRIGGER_LOC 6
/* Our special handling for GPIO accesses through ACPI is x86 specific */
#if defined CONFIG_X86 && defined CONFIG_ACPI
#define ACPI_GPIO_SUPPORT
#endif
struct goodix_chip_id {
const char *id;
const struct goodix_chip_data *data;
};
static int goodix_check_cfg_8(struct goodix_ts_data *ts,
const u8 *cfg, int len);
static int goodix_check_cfg_16(struct goodix_ts_data *ts,
const u8 *cfg, int len);
static void goodix_calc_cfg_checksum_8(struct goodix_ts_data *ts);
static void goodix_calc_cfg_checksum_16(struct goodix_ts_data *ts);
static const struct goodix_chip_data gt1x_chip_data = {
.config_addr = GOODIX_GT1X_REG_CONFIG_DATA,
.config_len = GOODIX_CONFIG_GT9X_LENGTH,
.check_config = goodix_check_cfg_16,
.calc_config_checksum = goodix_calc_cfg_checksum_16,
};
static const struct goodix_chip_data gt911_chip_data = {
.config_addr = GOODIX_GT9X_REG_CONFIG_DATA,
.config_len = GOODIX_CONFIG_911_LENGTH,
.check_config = goodix_check_cfg_8,
.calc_config_checksum = goodix_calc_cfg_checksum_8,
};
static const struct goodix_chip_data gt967_chip_data = {
.config_addr = GOODIX_GT9X_REG_CONFIG_DATA,
.config_len = GOODIX_CONFIG_967_LENGTH,
.check_config = goodix_check_cfg_8,
.calc_config_checksum = goodix_calc_cfg_checksum_8,
};
static const struct goodix_chip_data gt9x_chip_data = {
.config_addr = GOODIX_GT9X_REG_CONFIG_DATA,
.config_len = GOODIX_CONFIG_GT9X_LENGTH,
.check_config = goodix_check_cfg_8,
.calc_config_checksum = goodix_calc_cfg_checksum_8,
};
static const struct goodix_chip_id goodix_chip_ids[] = {
{ .id = "1151", .data = &gt1x_chip_data },
{ .id = "1158", .data = &gt1x_chip_data },
{ .id = "5663", .data = &gt1x_chip_data },
{ .id = "5688", .data = &gt1x_chip_data },
{ .id = "917S", .data = &gt1x_chip_data },
{ .id = "9286", .data = &gt1x_chip_data },
{ .id = "911", .data = &gt911_chip_data },
{ .id = "9271", .data = &gt911_chip_data },
{ .id = "9110", .data = &gt911_chip_data },
{ .id = "9111", .data = &gt911_chip_data },
{ .id = "927", .data = &gt911_chip_data },
{ .id = "928", .data = &gt911_chip_data },
{ .id = "912", .data = &gt967_chip_data },
{ .id = "9147", .data = &gt967_chip_data },
{ .id = "967", .data = &gt967_chip_data },
{ }
};
static const unsigned long goodix_irq_flags[] = {
IRQ_TYPE_EDGE_RISING,
IRQ_TYPE_EDGE_FALLING,
IRQ_TYPE_LEVEL_LOW,
IRQ_TYPE_LEVEL_HIGH,
};
static const struct dmi_system_id nine_bytes_report[] = {
#if defined(CONFIG_DMI) && defined(CONFIG_X86)
{
/* Lenovo Yoga Book X90F / X90L */
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "CHERRYVIEW D1 PLATFORM"),
DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "YETI-11"),
}
},
{
/* Lenovo Yoga Book X91F / X91L */
.matches = {
/* Non exact match to match F + L versions */
DMI_MATCH(DMI_PRODUCT_NAME, "Lenovo YB1-X91"),
}
},
#endif
{}
};
/*
* Those tablets have their x coordinate inverted
*/
static const struct dmi_system_id inverted_x_screen[] = {
#if defined(CONFIG_DMI) && defined(CONFIG_X86)
{
.ident = "Cube I15-TC",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Cube"),
DMI_MATCH(DMI_PRODUCT_NAME, "I15-TC")
},
},
#endif
{}
};
/**
* goodix_i2c_read - read data from a register of the i2c slave device.
*
* @client: i2c device.
* @reg: the register to read from.
* @buf: raw write data buffer.
* @len: length of the buffer to write
*/
int goodix_i2c_read(struct i2c_client *client, u16 reg, u8 *buf, int len)
{
struct i2c_msg msgs[2];
__be16 wbuf = cpu_to_be16(reg);
int ret;
msgs[0].flags = 0;
msgs[0].addr = client->addr;
msgs[0].len = 2;
msgs[0].buf = (u8 *)&wbuf;
msgs[1].flags = I2C_M_RD;
msgs[1].addr = client->addr;
msgs[1].len = len;
msgs[1].buf = buf;
ret = i2c_transfer(client->adapter, msgs, 2);
if (ret >= 0)
ret = (ret == ARRAY_SIZE(msgs) ? 0 : -EIO);
if (ret)
dev_err(&client->dev, "Error reading %d bytes from 0x%04x: %d\n",
len, reg, ret);
return ret;
}
/**
* goodix_i2c_write - write data to a register of the i2c slave device.
*
* @client: i2c device.
* @reg: the register to write to.
* @buf: raw data buffer to write.
* @len: length of the buffer to write
*/
int goodix_i2c_write(struct i2c_client *client, u16 reg, const u8 *buf, int len)
{
u8 *addr_buf;
struct i2c_msg msg;
int ret;
addr_buf = kmalloc(len + 2, GFP_KERNEL);
if (!addr_buf)
return -ENOMEM;
addr_buf[0] = reg >> 8;
addr_buf[1] = reg & 0xFF;
memcpy(&addr_buf[2], buf, len);
msg.flags = 0;
msg.addr = client->addr;
msg.buf = addr_buf;
msg.len = len + 2;
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret >= 0)
ret = (ret == 1 ? 0 : -EIO);
kfree(addr_buf);
if (ret)
dev_err(&client->dev, "Error writing %d bytes to 0x%04x: %d\n",
len, reg, ret);
return ret;
}
int goodix_i2c_write_u8(struct i2c_client *client, u16 reg, u8 value)
{
return goodix_i2c_write(client, reg, &value, sizeof(value));
}
static const struct goodix_chip_data *goodix_get_chip_data(const char *id)
{
unsigned int i;
for (i = 0; goodix_chip_ids[i].id; i++) {
if (!strcmp(goodix_chip_ids[i].id, id))
return goodix_chip_ids[i].data;
}
return &gt9x_chip_data;
}
static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data)
{
unsigned long max_timeout;
int touch_num;
int error;
u16 addr = GOODIX_READ_COOR_ADDR;
/*
* We are going to read 1-byte header,
* ts->contact_size * max(1, touch_num) bytes of coordinates
* and 1-byte footer which contains the touch-key code.
*/
const int header_contact_keycode_size = 1 + ts->contact_size + 1;
/*
* The 'buffer status' bit, which indicates that the data is valid, is
* not set as soon as the interrupt is raised, but slightly after.
* This takes around 10 ms to happen, so we poll for 20 ms.
*/
max_timeout = jiffies + msecs_to_jiffies(GOODIX_BUFFER_STATUS_TIMEOUT);
do {
error = goodix_i2c_read(ts->client, addr, data,
header_contact_keycode_size);
if (error)
return error;
if (data[0] & GOODIX_BUFFER_STATUS_READY) {
touch_num = data[0] & 0x0f;
if (touch_num > ts->max_touch_num)
return -EPROTO;
if (touch_num > 1) {
addr += header_contact_keycode_size;
data += header_contact_keycode_size;
error = goodix_i2c_read(ts->client,
addr, data,
ts->contact_size *
(touch_num - 1));
if (error)
return error;
}
return touch_num;
}
if (data[0] == 0 && ts->firmware_name) {
if (goodix_handle_fw_request(ts))
return 0;
}
usleep_range(1000, 2000); /* Poll every 1 - 2 ms */
} while (time_before(jiffies, max_timeout));
/*
* The Goodix panel will send spurious interrupts after a
* 'finger up' event, which will always cause a timeout.
*/
return -ENOMSG;
}
static int goodix_create_pen_input(struct goodix_ts_data *ts)
{
struct device *dev = &ts->client->dev;
struct input_dev *input;
input = devm_input_allocate_device(dev);
if (!input)
return -ENOMEM;
input_copy_abs(input, ABS_X, ts->input_dev, ABS_MT_POSITION_X);
input_copy_abs(input, ABS_Y, ts->input_dev, ABS_MT_POSITION_Y);
/*
* The resolution of these touchscreens is about 10 units/mm, the actual
* resolution does not matter much since we set INPUT_PROP_DIRECT.
* Userspace wants something here though, so just set it to 10 units/mm.
*/
input_abs_set_res(input, ABS_X, 10);
input_abs_set_res(input, ABS_Y, 10);
input_set_abs_params(input, ABS_PRESSURE, 0, 255, 0, 0);
input_set_capability(input, EV_KEY, BTN_TOUCH);
input_set_capability(input, EV_KEY, BTN_TOOL_PEN);
input_set_capability(input, EV_KEY, BTN_STYLUS);
input_set_capability(input, EV_KEY, BTN_STYLUS2);
__set_bit(INPUT_PROP_DIRECT, input->propbit);
input->name = "Goodix Active Pen";
input->phys = "input/pen";
input->id.bustype = BUS_I2C;
input->id.vendor = 0x0416;
if (kstrtou16(ts->id, 10, &input->id.product))
input->id.product = 0x1001;
input->id.version = ts->version;
ts->input_pen = input;
return 0;
}
static void goodix_ts_report_pen_down(struct goodix_ts_data *ts, u8 *data)
{
int input_x, input_y, input_w, error;
u8 key_value;
if (!ts->pen_input_registered) {
error = input_register_device(ts->input_pen);
ts->pen_input_registered = (error == 0) ? 1 : error;
}
if (ts->pen_input_registered < 0)
return;
if (ts->contact_size == 9) {
input_x = get_unaligned_le16(&data[4]);
input_y = get_unaligned_le16(&data[6]);
input_w = get_unaligned_le16(&data[8]);
} else {
input_x = get_unaligned_le16(&data[2]);
input_y = get_unaligned_le16(&data[4]);
input_w = get_unaligned_le16(&data[6]);
}
touchscreen_report_pos(ts->input_pen, &ts->prop, input_x, input_y, false);
input_report_abs(ts->input_pen, ABS_PRESSURE, input_w);
input_report_key(ts->input_pen, BTN_TOUCH, 1);
input_report_key(ts->input_pen, BTN_TOOL_PEN, 1);
if (data[0] & GOODIX_HAVE_KEY) {
key_value = data[1 + ts->contact_size];
input_report_key(ts->input_pen, BTN_STYLUS, key_value & 0x10);
input_report_key(ts->input_pen, BTN_STYLUS2, key_value & 0x20);
} else {
input_report_key(ts->input_pen, BTN_STYLUS, 0);
input_report_key(ts->input_pen, BTN_STYLUS2, 0);
}
input_sync(ts->input_pen);
}
static void goodix_ts_report_pen_up(struct goodix_ts_data *ts)
{
if (!ts->input_pen)
return;
input_report_key(ts->input_pen, BTN_TOUCH, 0);
input_report_key(ts->input_pen, BTN_TOOL_PEN, 0);
input_report_key(ts->input_pen, BTN_STYLUS, 0);
input_report_key(ts->input_pen, BTN_STYLUS2, 0);
input_sync(ts->input_pen);
}
static void goodix_ts_report_touch_8b(struct goodix_ts_data *ts, u8 *coor_data)
{
int id = coor_data[0] & 0x0F;
int input_x = get_unaligned_le16(&coor_data[1]);
int input_y = get_unaligned_le16(&coor_data[3]);
int input_w = get_unaligned_le16(&coor_data[5]);
input_mt_slot(ts->input_dev, id);
input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
touchscreen_report_pos(ts->input_dev, &ts->prop,
input_x, input_y, true);
input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w);
input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w);
}
static void goodix_ts_report_touch_9b(struct goodix_ts_data *ts, u8 *coor_data)
{
int id = coor_data[1] & 0x0F;
int input_x = get_unaligned_le16(&coor_data[3]);
int input_y = get_unaligned_le16(&coor_data[5]);
int input_w = get_unaligned_le16(&coor_data[7]);
input_mt_slot(ts->input_dev, id);
input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
touchscreen_report_pos(ts->input_dev, &ts->prop,
input_x, input_y, true);
input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w);
input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w);
}
static void goodix_ts_release_keys(struct goodix_ts_data *ts)
{
int i;
for (i = 0; i < GOODIX_MAX_KEYS; i++)
input_report_key(ts->input_dev, ts->keymap[i], 0);
}
static void goodix_ts_report_key(struct goodix_ts_data *ts, u8 *data)
{
int touch_num;
u8 key_value;
int i;
if (data[0] & GOODIX_HAVE_KEY) {
touch_num = data[0] & 0x0f;
key_value = data[1 + ts->contact_size * touch_num];
for (i = 0; i < GOODIX_MAX_KEYS; i++)
if (key_value & BIT(i))
input_report_key(ts->input_dev,
ts->keymap[i], 1);
} else {
goodix_ts_release_keys(ts);
}
}
/**
* goodix_process_events - Process incoming events
*
* @ts: our goodix_ts_data pointer
*
* Called when the IRQ is triggered. Read the current device state, and push
* the input events to the user space.
*/
static void goodix_process_events(struct goodix_ts_data *ts)
{
u8 point_data[2 + GOODIX_MAX_CONTACT_SIZE * GOODIX_MAX_CONTACTS];
int touch_num;
int i;
touch_num = goodix_ts_read_input_report(ts, point_data);
if (touch_num < 0)
return;
/* The pen being down is always reported as a single touch */
if (touch_num == 1 && (point_data[1] & 0x80)) {
goodix_ts_report_pen_down(ts, point_data);
goodix_ts_release_keys(ts);
goto sync; /* Release any previously registered touches */
} else {
goodix_ts_report_pen_up(ts);
}
goodix_ts_report_key(ts, point_data);
for (i = 0; i < touch_num; i++)
if (ts->contact_size == 9)
goodix_ts_report_touch_9b(ts,
&point_data[1 + ts->contact_size * i]);
else
goodix_ts_report_touch_8b(ts,
&point_data[1 + ts->contact_size * i]);
sync:
input_mt_sync_frame(ts->input_dev);
input_sync(ts->input_dev);
}
/**
* goodix_ts_irq_handler - The IRQ handler
*
* @irq: interrupt number.
* @dev_id: private data pointer.
*/
static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id)
{
struct goodix_ts_data *ts = dev_id;
goodix_process_events(ts);
goodix_i2c_write_u8(ts->client, GOODIX_READ_COOR_ADDR, 0);
return IRQ_HANDLED;
}
static void goodix_free_irq(struct goodix_ts_data *ts)
{
devm_free_irq(&ts->client->dev, ts->client->irq, ts);
}
static int goodix_request_irq(struct goodix_ts_data *ts)
{
return devm_request_threaded_irq(&ts->client->dev, ts->client->irq,
NULL, goodix_ts_irq_handler,
ts->irq_flags, ts->client->name, ts);
}
static int goodix_check_cfg_8(struct goodix_ts_data *ts, const u8 *cfg, int len)
{
int i, raw_cfg_len = len - 2;
u8 check_sum = 0;
for (i = 0; i < raw_cfg_len; i++)
check_sum += cfg[i];
check_sum = (~check_sum) + 1;
if (check_sum != cfg[raw_cfg_len]) {
dev_err(&ts->client->dev,
"The checksum of the config fw is not correct");
return -EINVAL;
}
if (cfg[raw_cfg_len + 1] != 1) {
dev_err(&ts->client->dev,
"Config fw must have Config_Fresh register set");
return -EINVAL;
}
return 0;
}
static void goodix_calc_cfg_checksum_8(struct goodix_ts_data *ts)
{
int i, raw_cfg_len = ts->chip->config_len - 2;
u8 check_sum = 0;
for (i = 0; i < raw_cfg_len; i++)
check_sum += ts->config[i];
check_sum = (~check_sum) + 1;
ts->config[raw_cfg_len] = check_sum;
ts->config[raw_cfg_len + 1] = 1; /* Set "config_fresh" bit */
}
static int goodix_check_cfg_16(struct goodix_ts_data *ts, const u8 *cfg,
int len)
{
int i, raw_cfg_len = len - 3;
u16 check_sum = 0;
for (i = 0; i < raw_cfg_len; i += 2)
check_sum += get_unaligned_be16(&cfg[i]);
check_sum = (~check_sum) + 1;
if (check_sum != get_unaligned_be16(&cfg[raw_cfg_len])) {
dev_err(&ts->client->dev,
"The checksum of the config fw is not correct");
return -EINVAL;
}
if (cfg[raw_cfg_len + 2] != 1) {
dev_err(&ts->client->dev,
"Config fw must have Config_Fresh register set");
return -EINVAL;
}
return 0;
}
static void goodix_calc_cfg_checksum_16(struct goodix_ts_data *ts)
{
int i, raw_cfg_len = ts->chip->config_len - 3;
u16 check_sum = 0;
for (i = 0; i < raw_cfg_len; i += 2)
check_sum += get_unaligned_be16(&ts->config[i]);
check_sum = (~check_sum) + 1;
put_unaligned_be16(check_sum, &ts->config[raw_cfg_len]);
ts->config[raw_cfg_len + 2] = 1; /* Set "config_fresh" bit */
}
/**
* goodix_check_cfg - Checks if config fw is valid
*
* @ts: goodix_ts_data pointer
* @cfg: firmware config data
* @len: config data length
*/
static int goodix_check_cfg(struct goodix_ts_data *ts, const u8 *cfg, int len)
{
if (len < GOODIX_CONFIG_MIN_LENGTH ||
len > GOODIX_CONFIG_MAX_LENGTH) {
dev_err(&ts->client->dev,
"The length of the config fw is not correct");
return -EINVAL;
}
return ts->chip->check_config(ts, cfg, len);
}
/**
* goodix_send_cfg - Write fw config to device
*
* @ts: goodix_ts_data pointer
* @cfg: config firmware to write to device
* @len: config data length
*/
int goodix_send_cfg(struct goodix_ts_data *ts, const u8 *cfg, int len)
{
int error;
error = goodix_check_cfg(ts, cfg, len);
if (error)
return error;
error = goodix_i2c_write(ts->client, ts->chip->config_addr, cfg, len);
if (error)
return error;
dev_dbg(&ts->client->dev, "Config sent successfully.");
/* Let the firmware reconfigure itself, so sleep for 10ms */
usleep_range(10000, 11000);
return 0;
}
#ifdef ACPI_GPIO_SUPPORT
static int goodix_pin_acpi_direction_input(struct goodix_ts_data *ts)
{
acpi_handle handle = ACPI_HANDLE(&ts->client->dev);
acpi_status status;
status = acpi_evaluate_object(handle, "INTI", NULL, NULL);
return ACPI_SUCCESS(status) ? 0 : -EIO;
}
static int goodix_pin_acpi_output_method(struct goodix_ts_data *ts, int value)
{
acpi_handle handle = ACPI_HANDLE(&ts->client->dev);
acpi_status status;
status = acpi_execute_simple_method(handle, "INTO", value);
return ACPI_SUCCESS(status) ? 0 : -EIO;
}
#else
static int goodix_pin_acpi_direction_input(struct goodix_ts_data *ts)
{
dev_err(&ts->client->dev,
"%s called on device without ACPI support\n", __func__);
return -EINVAL;
}
static int goodix_pin_acpi_output_method(struct goodix_ts_data *ts, int value)
{
dev_err(&ts->client->dev,
"%s called on device without ACPI support\n", __func__);
return -EINVAL;
}
#endif
static int goodix_irq_direction_output(struct goodix_ts_data *ts, int value)
{
switch (ts->irq_pin_access_method) {
case IRQ_PIN_ACCESS_NONE:
dev_err(&ts->client->dev,
"%s called without an irq_pin_access_method set\n",
__func__);
return -EINVAL;
case IRQ_PIN_ACCESS_GPIO:
return gpiod_direction_output(ts->gpiod_int, value);
case IRQ_PIN_ACCESS_ACPI_GPIO:
/*
* The IRQ pin triggers on a falling edge, so its gets marked
* as active-low, use output_raw to avoid the value inversion.
*/
return gpiod_direction_output_raw(ts->gpiod_int, value);
case IRQ_PIN_ACCESS_ACPI_METHOD:
return goodix_pin_acpi_output_method(ts, value);
}
return -EINVAL; /* Never reached */
}
static int goodix_irq_direction_input(struct goodix_ts_data *ts)
{
switch (ts->irq_pin_access_method) {
case IRQ_PIN_ACCESS_NONE:
dev_err(&ts->client->dev,
"%s called without an irq_pin_access_method set\n",
__func__);
return -EINVAL;
case IRQ_PIN_ACCESS_GPIO:
return gpiod_direction_input(ts->gpiod_int);
case IRQ_PIN_ACCESS_ACPI_GPIO:
return gpiod_direction_input(ts->gpiod_int);
case IRQ_PIN_ACCESS_ACPI_METHOD:
return goodix_pin_acpi_direction_input(ts);
}
return -EINVAL; /* Never reached */
}
int goodix_int_sync(struct goodix_ts_data *ts)
{
int error;
error = goodix_irq_direction_output(ts, 0);
if (error)
goto error;
msleep(50); /* T5: 50ms */
error = goodix_irq_direction_input(ts);
if (error)
goto error;
return 0;
error:
dev_err(&ts->client->dev, "Controller irq sync failed.\n");
return error;
}
/**
* goodix_reset_no_int_sync - Reset device, leaving interrupt line in output mode
*
* @ts: goodix_ts_data pointer
*/
int goodix_reset_no_int_sync(struct goodix_ts_data *ts)
{
int error;
/* begin select I2C slave addr */
error = gpiod_direction_output(ts->gpiod_rst, 0);
if (error)
goto error;
msleep(20); /* T2: > 10ms */
/* HIGH: 0x28/0x29, LOW: 0xBA/0xBB */
error = goodix_irq_direction_output(ts, ts->client->addr == 0x14);
if (error)
goto error;
usleep_range(100, 2000); /* T3: > 100us */
error = gpiod_direction_output(ts->gpiod_rst, 1);
if (error)
goto error;
usleep_range(6000, 10000); /* T4: > 5ms */
/*
* Put the reset pin back in to input / high-impedance mode to save
* power. Only do this in the non ACPI case since some ACPI boards
* don't have a pull-up, so there the reset pin must stay active-high.
*/
if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_GPIO) {
error = gpiod_direction_input(ts->gpiod_rst);
if (error)
goto error;
}
return 0;
error:
dev_err(&ts->client->dev, "Controller reset failed.\n");
return error;
}
/**
* goodix_reset - Reset device during power on
*
* @ts: goodix_ts_data pointer
*/
static int goodix_reset(struct goodix_ts_data *ts)
{
int error;
error = goodix_reset_no_int_sync(ts);
if (error)
return error;
return goodix_int_sync(ts);
}
#ifdef ACPI_GPIO_SUPPORT
static const struct acpi_gpio_params first_gpio = { 0, 0, false };
static const struct acpi_gpio_params second_gpio = { 1, 0, false };
static const struct acpi_gpio_mapping acpi_goodix_int_first_gpios[] = {
{ GOODIX_GPIO_INT_NAME "-gpios", &first_gpio, 1 },
{ GOODIX_GPIO_RST_NAME "-gpios", &second_gpio, 1 },
{ },
};
static const struct acpi_gpio_mapping acpi_goodix_int_last_gpios[] = {
{ GOODIX_GPIO_RST_NAME "-gpios", &first_gpio, 1 },
{ GOODIX_GPIO_INT_NAME "-gpios", &second_gpio, 1 },
{ },
};
static const struct acpi_gpio_mapping acpi_goodix_reset_only_gpios[] = {
{ GOODIX_GPIO_RST_NAME "-gpios", &first_gpio, 1 },
{ },
};
static int goodix_resource(struct acpi_resource *ares, void *data)
{
struct goodix_ts_data *ts = data;
struct device *dev = &ts->client->dev;
struct acpi_resource_gpio *gpio;
if (acpi_gpio_get_irq_resource(ares, &gpio)) {
if (ts->gpio_int_idx == -1) {
ts->gpio_int_idx = ts->gpio_count;
} else {
dev_err(dev, "More then one GpioInt resource, ignoring ACPI GPIO resources\n");
ts->gpio_int_idx = -2;
}
ts->gpio_count++;
} else if (acpi_gpio_get_io_resource(ares, &gpio))
ts->gpio_count++;
return 0;
}
/*
* This function gets called in case we fail to get the irq GPIO directly
* because the ACPI tables lack GPIO-name to APCI _CRS index mappings
* (no _DSD UUID daffd814-6eba-4d8c-8a91-bc9bbf4aa301 data).
* In that case we add our own mapping and then goodix_get_gpio_config()
* retries to get the GPIOs based on the added mapping.
*/
static int goodix_add_acpi_gpio_mappings(struct goodix_ts_data *ts)
{
const struct acpi_gpio_mapping *gpio_mapping = NULL;
struct device *dev = &ts->client->dev;
LIST_HEAD(resources);
int irq, ret;
ts->gpio_count = 0;
ts->gpio_int_idx = -1;
ret = acpi_dev_get_resources(ACPI_COMPANION(dev), &resources,
goodix_resource, ts);
if (ret < 0) {
dev_err(dev, "Error getting ACPI resources: %d\n", ret);
return ret;
}
acpi_dev_free_resource_list(&resources);
/*
* CHT devices should have a GpioInt + a regular GPIO ACPI resource.
* Some CHT devices have a bug (where the also is bogus Interrupt
* resource copied from a previous BYT based generation). i2c-core-acpi
* will use the non-working Interrupt resource, fix this up.
*/
if (soc_intel_is_cht() && ts->gpio_count == 2 && ts->gpio_int_idx != -1) {
irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0);
if (irq > 0 && irq != ts->client->irq) {
dev_warn(dev, "Overriding IRQ %d -> %d\n", ts->client->irq, irq);
ts->client->irq = irq;
}
}
if (ts->gpio_count == 2 && ts->gpio_int_idx == 0) {
ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO;
gpio_mapping = acpi_goodix_int_first_gpios;
} else if (ts->gpio_count == 2 && ts->gpio_int_idx == 1) {
ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO;
gpio_mapping = acpi_goodix_int_last_gpios;
} else if (ts->gpio_count == 1 && ts->gpio_int_idx == -1 &&
acpi_has_method(ACPI_HANDLE(dev), "INTI") &&
acpi_has_method(ACPI_HANDLE(dev), "INTO")) {
dev_info(dev, "Using ACPI INTI and INTO methods for IRQ pin access\n");
ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_METHOD;
gpio_mapping = acpi_goodix_reset_only_gpios;
} else if (soc_intel_is_byt() && ts->gpio_count == 2 && ts->gpio_int_idx == -1) {
dev_info(dev, "No ACPI GpioInt resource, assuming that the GPIO order is reset, int\n");
ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO;
gpio_mapping = acpi_goodix_int_last_gpios;
} else {
dev_warn(dev, "Unexpected ACPI resources: gpio_count %d, gpio_int_idx %d\n",
ts->gpio_count, ts->gpio_int_idx);
/*
* On some devices _PS0 does a reset for us and
* sometimes this is necessary for things to work.
*/
acpi_device_fix_up_power(ACPI_COMPANION(dev));
return -EINVAL;
}
/*
* Normally we put the reset pin in input / high-impedance mode to save
* power. But some x86/ACPI boards don't have a pull-up, so for the ACPI
* case, leave the pin as is. This results in the pin not being touched
* at all on x86/ACPI boards, except when needed for error-recover.
*/
ts->gpiod_rst_flags = GPIOD_ASIS;
return devm_acpi_dev_add_driver_gpios(dev, gpio_mapping);
}
#else
static int goodix_add_acpi_gpio_mappings(struct goodix_ts_data *ts)
{
return -EINVAL;
}
#endif /* CONFIG_X86 && CONFIG_ACPI */
/**
* goodix_get_gpio_config - Get GPIO config from ACPI/DT
*
* @ts: goodix_ts_data pointer
*/
static int goodix_get_gpio_config(struct goodix_ts_data *ts)
{
int error;
struct device *dev;
struct gpio_desc *gpiod;
bool added_acpi_mappings = false;
if (!ts->client)
return -EINVAL;
dev = &ts->client->dev;
/*
* By default we request the reset pin as input, leaving it in
* high-impedance when not resetting the controller to save power.
*/
ts->gpiod_rst_flags = GPIOD_IN;
ts->avdd28 = devm_regulator_get(dev, "AVDD28");
if (IS_ERR(ts->avdd28)) {
error = PTR_ERR(ts->avdd28);
if (error != -EPROBE_DEFER)
dev_err(dev,
"Failed to get AVDD28 regulator: %d\n", error);
return error;
}
ts->vddio = devm_regulator_get(dev, "VDDIO");
if (IS_ERR(ts->vddio)) {
error = PTR_ERR(ts->vddio);
if (error != -EPROBE_DEFER)
dev_err(dev,
"Failed to get VDDIO regulator: %d\n", error);
return error;
}
retry_get_irq_gpio:
/* Get the interrupt GPIO pin number */
gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_INT_NAME, GPIOD_IN);
if (IS_ERR(gpiod)) {
error = PTR_ERR(gpiod);
if (error != -EPROBE_DEFER)
dev_err(dev, "Failed to get %s GPIO: %d\n",
GOODIX_GPIO_INT_NAME, error);
return error;
}
if (!gpiod && has_acpi_companion(dev) && !added_acpi_mappings) {
added_acpi_mappings = true;
if (goodix_add_acpi_gpio_mappings(ts) == 0)
goto retry_get_irq_gpio;
}
ts->gpiod_int = gpiod;
/* Get the reset line GPIO pin number */
gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_RST_NAME, ts->gpiod_rst_flags);
if (IS_ERR(gpiod)) {
error = PTR_ERR(gpiod);
if (error != -EPROBE_DEFER)
dev_err(dev, "Failed to get %s GPIO: %d\n",
GOODIX_GPIO_RST_NAME, error);
return error;
}
ts->gpiod_rst = gpiod;
switch (ts->irq_pin_access_method) {
case IRQ_PIN_ACCESS_ACPI_GPIO:
/*
* We end up here if goodix_add_acpi_gpio_mappings() has
* called devm_acpi_dev_add_driver_gpios() because the ACPI
* tables did not contain name to index mappings.
* Check that we successfully got both GPIOs after we've
* added our own acpi_gpio_mapping and if we did not get both
* GPIOs reset irq_pin_access_method to IRQ_PIN_ACCESS_NONE.
*/
if (!ts->gpiod_int || !ts->gpiod_rst)
ts->irq_pin_access_method = IRQ_PIN_ACCESS_NONE;
break;
case IRQ_PIN_ACCESS_ACPI_METHOD:
if (!ts->gpiod_rst)
ts->irq_pin_access_method = IRQ_PIN_ACCESS_NONE;
break;
default:
if (ts->gpiod_int && ts->gpiod_rst) {
ts->reset_controller_at_probe = true;
ts->load_cfg_from_disk = true;
ts->irq_pin_access_method = IRQ_PIN_ACCESS_GPIO;
}
}
return 0;
}
/**
* goodix_read_config - Read the embedded configuration of the panel
*
* @ts: our goodix_ts_data pointer
*
* Must be called during probe
*/
static void goodix_read_config(struct goodix_ts_data *ts)
{
int x_max, y_max;
int error;
/*
* On controllers where we need to upload the firmware
* (controllers without flash) ts->config already has the config
* at this point and the controller itself does not have it yet!
*/
if (!ts->firmware_name) {
error = goodix_i2c_read(ts->client, ts->chip->config_addr,
ts->config, ts->chip->config_len);
if (error) {
ts->int_trigger_type = GOODIX_INT_TRIGGER;
ts->max_touch_num = GOODIX_MAX_CONTACTS;
return;
}
}
ts->int_trigger_type = ts->config[TRIGGER_LOC] & 0x03;
ts->max_touch_num = ts->config[MAX_CONTACTS_LOC] & 0x0f;
x_max = get_unaligned_le16(&ts->config[RESOLUTION_LOC]);
y_max = get_unaligned_le16(&ts->config[RESOLUTION_LOC + 2]);
if (x_max && y_max) {
input_abs_set_max(ts->input_dev, ABS_MT_POSITION_X, x_max - 1);
input_abs_set_max(ts->input_dev, ABS_MT_POSITION_Y, y_max - 1);
}
ts->chip->calc_config_checksum(ts);
}
/**
* goodix_read_version - Read goodix touchscreen version
*
* @ts: our goodix_ts_data pointer
*/
static int goodix_read_version(struct goodix_ts_data *ts)
{
int error;
u8 buf[6];
char id_str[GOODIX_ID_MAX_LEN + 1];
error = goodix_i2c_read(ts->client, GOODIX_REG_ID, buf, sizeof(buf));
if (error)
return error;
memcpy(id_str, buf, GOODIX_ID_MAX_LEN);
id_str[GOODIX_ID_MAX_LEN] = 0;
strscpy(ts->id, id_str, GOODIX_ID_MAX_LEN + 1);
ts->version = get_unaligned_le16(&buf[4]);
dev_info(&ts->client->dev, "ID %s, version: %04x\n", ts->id,
ts->version);
return 0;
}
/**
* goodix_i2c_test - I2C test function to check if the device answers.
*
* @client: the i2c client
*/
static int goodix_i2c_test(struct i2c_client *client)
{
int retry = 0;
int error;
u8 test;
while (retry++ < 2) {
error = goodix_i2c_read(client, GOODIX_REG_ID, &test, 1);
if (!error)
return 0;
msleep(20);
}
return error;
}
/**
* goodix_configure_dev - Finish device initialization
*
* @ts: our goodix_ts_data pointer
*
* Must be called from probe to finish initialization of the device.
* Contains the common initialization code for both devices that
* declare gpio pins and devices that do not. It is either called
* directly from probe or from request_firmware_wait callback.
*/
static int goodix_configure_dev(struct goodix_ts_data *ts)
{
int error;
int i;
ts->int_trigger_type = GOODIX_INT_TRIGGER;
ts->max_touch_num = GOODIX_MAX_CONTACTS;
ts->input_dev = devm_input_allocate_device(&ts->client->dev);
if (!ts->input_dev) {
dev_err(&ts->client->dev, "Failed to allocate input device.");
return -ENOMEM;
}
ts->input_dev->name = "Goodix Capacitive TouchScreen";
ts->input_dev->phys = "input/ts";
ts->input_dev->id.bustype = BUS_I2C;
ts->input_dev->id.vendor = 0x0416;
if (kstrtou16(ts->id, 10, &ts->input_dev->id.product))
ts->input_dev->id.product = 0x1001;
ts->input_dev->id.version = ts->version;
ts->input_dev->keycode = ts->keymap;
ts->input_dev->keycodesize = sizeof(ts->keymap[0]);
ts->input_dev->keycodemax = GOODIX_MAX_KEYS;
/* Capacitive Windows/Home button on some devices */
for (i = 0; i < GOODIX_MAX_KEYS; ++i) {
if (i == 0)
ts->keymap[i] = KEY_LEFTMETA;
else
ts->keymap[i] = KEY_F1 + (i - 1);
input_set_capability(ts->input_dev, EV_KEY, ts->keymap[i]);
}
input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X);
input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y);
input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
retry_read_config:
/* Read configuration and apply touchscreen parameters */
goodix_read_config(ts);
/* Try overriding touchscreen parameters via device properties */
touchscreen_parse_properties(ts->input_dev, true, &ts->prop);
if (!ts->prop.max_x || !ts->prop.max_y || !ts->max_touch_num) {
if (!ts->reset_controller_at_probe &&
ts->irq_pin_access_method != IRQ_PIN_ACCESS_NONE) {
dev_info(&ts->client->dev, "Config not set, resetting controller\n");
/* Retry after a controller reset */
ts->reset_controller_at_probe = true;
error = goodix_reset(ts);
if (error)
return error;
goto retry_read_config;
}
dev_err(&ts->client->dev,
"Invalid config (%d, %d, %d), using defaults\n",
ts->prop.max_x, ts->prop.max_y, ts->max_touch_num);
ts->prop.max_x = GOODIX_MAX_WIDTH - 1;
ts->prop.max_y = GOODIX_MAX_HEIGHT - 1;
ts->max_touch_num = GOODIX_MAX_CONTACTS;
input_abs_set_max(ts->input_dev,
ABS_MT_POSITION_X, ts->prop.max_x);
input_abs_set_max(ts->input_dev,
ABS_MT_POSITION_Y, ts->prop.max_y);
}
if (dmi_check_system(nine_bytes_report)) {
ts->contact_size = 9;
dev_dbg(&ts->client->dev,
"Non-standard 9-bytes report format quirk\n");
}
if (dmi_check_system(inverted_x_screen)) {
ts->prop.invert_x = true;
dev_dbg(&ts->client->dev,
"Applying 'inverted x screen' quirk\n");
}
error = input_mt_init_slots(ts->input_dev, ts->max_touch_num,
INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
if (error) {
dev_err(&ts->client->dev,
"Failed to initialize MT slots: %d", error);
return error;
}
error = input_register_device(ts->input_dev);
if (error) {
dev_err(&ts->client->dev,
"Failed to register input device: %d", error);
return error;
}
/*
* Create the input_pen device before goodix_request_irq() calls
* devm_request_threaded_irq() so that the devm framework frees
* it after disabling the irq.
* Unfortunately there is no way to detect if the touchscreen has pen
* support, so registering the dev is delayed till the first pen event.
*/
error = goodix_create_pen_input(ts);
if (error)
return error;
ts->irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT;
error = goodix_request_irq(ts);
if (error) {
dev_err(&ts->client->dev, "request IRQ failed: %d\n", error);
return error;
}
return 0;
}
/**
* goodix_config_cb - Callback to finish device init
*
* @cfg: firmware config
* @ctx: our goodix_ts_data pointer
*
* request_firmware_wait callback that finishes
* initialization of the device.
*/
static void goodix_config_cb(const struct firmware *cfg, void *ctx)
{
struct goodix_ts_data *ts = ctx;
int error;
if (ts->firmware_name) {
if (!cfg)
goto err_release_cfg;
error = goodix_check_cfg(ts, cfg->data, cfg->size);
if (error)
goto err_release_cfg;
memcpy(ts->config, cfg->data, cfg->size);
} else if (cfg) {
/* send device configuration to the firmware */
error = goodix_send_cfg(ts, cfg->data, cfg->size);
if (error)
goto err_release_cfg;
}
goodix_configure_dev(ts);
err_release_cfg:
release_firmware(cfg);
complete_all(&ts->firmware_loading_complete);
}
static void goodix_disable_regulators(void *arg)
{
struct goodix_ts_data *ts = arg;
regulator_disable(ts->vddio);
regulator_disable(ts->avdd28);
}
static int goodix_ts_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct goodix_ts_data *ts;
const char *cfg_name;
int error;
dev_dbg(&client->dev, "I2C Address: 0x%02x\n", client->addr);
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(&client->dev, "I2C check functionality failed.\n");
return -ENXIO;
}
ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
if (!ts)
return -ENOMEM;
ts->client = client;
i2c_set_clientdata(client, ts);
init_completion(&ts->firmware_loading_complete);
ts->contact_size = GOODIX_CONTACT_SIZE;
error = goodix_get_gpio_config(ts);
if (error)
return error;
/* power up the controller */
error = regulator_enable(ts->avdd28);
if (error) {
dev_err(&client->dev,
"Failed to enable AVDD28 regulator: %d\n",
error);
return error;
}
error = regulator_enable(ts->vddio);
if (error) {
dev_err(&client->dev,
"Failed to enable VDDIO regulator: %d\n",
error);
regulator_disable(ts->avdd28);
return error;
}
error = devm_add_action_or_reset(&client->dev,
goodix_disable_regulators, ts);
if (error)
return error;
reset:
if (ts->reset_controller_at_probe) {
/* reset the controller */
error = goodix_reset(ts);
if (error)
return error;
}
error = goodix_i2c_test(client);
if (error) {
if (!ts->reset_controller_at_probe &&
ts->irq_pin_access_method != IRQ_PIN_ACCESS_NONE) {
/* Retry after a controller reset */
ts->reset_controller_at_probe = true;
goto reset;
}
dev_err(&client->dev, "I2C communication failure: %d\n", error);
return error;
}
error = goodix_firmware_check(ts);
if (error)
return error;
error = goodix_read_version(ts);
if (error)
return error;
ts->chip = goodix_get_chip_data(ts->id);
if (ts->load_cfg_from_disk) {
/* update device config */
error = device_property_read_string(&client->dev,
"goodix,config-name",
&cfg_name);
if (!error)
snprintf(ts->cfg_name, sizeof(ts->cfg_name),
"goodix/%s", cfg_name);
else
snprintf(ts->cfg_name, sizeof(ts->cfg_name),
"goodix_%s_cfg.bin", ts->id);
error = request_firmware_nowait(THIS_MODULE, true, ts->cfg_name,
&client->dev, GFP_KERNEL, ts,
goodix_config_cb);
if (error) {
dev_err(&client->dev,
"Failed to invoke firmware loader: %d\n",
error);
return error;
}
return 0;
} else {
error = goodix_configure_dev(ts);
if (error)
return error;
}
return 0;
}
static void goodix_ts_remove(struct i2c_client *client)
{
struct goodix_ts_data *ts = i2c_get_clientdata(client);
if (ts->load_cfg_from_disk)
wait_for_completion(&ts->firmware_loading_complete);
}
static int __maybe_unused goodix_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct goodix_ts_data *ts = i2c_get_clientdata(client);
int error;
if (ts->load_cfg_from_disk)
wait_for_completion(&ts->firmware_loading_complete);
/* We need gpio pins to suspend/resume */
if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE) {
disable_irq(client->irq);
return 0;
}
/* Free IRQ as IRQ pin is used as output in the suspend sequence */
goodix_free_irq(ts);
/* Save reference (calibration) info if necessary */
goodix_save_bak_ref(ts);
/* Output LOW on the INT pin for 5 ms */
error = goodix_irq_direction_output(ts, 0);
if (error) {
goodix_request_irq(ts);
return error;
}
usleep_range(5000, 6000);
error = goodix_i2c_write_u8(ts->client, GOODIX_REG_COMMAND,
GOODIX_CMD_SCREEN_OFF);
if (error) {
goodix_irq_direction_input(ts);
goodix_request_irq(ts);
return -EAGAIN;
}
/*
* The datasheet specifies that the interval between sending screen-off
* command and wake-up should be longer than 58 ms. To avoid waking up
* sooner, delay 58ms here.
*/
msleep(58);
return 0;
}
static int __maybe_unused goodix_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct goodix_ts_data *ts = i2c_get_clientdata(client);
u8 config_ver;
int error;
if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE) {
enable_irq(client->irq);
return 0;
}
/*
* Exit sleep mode by outputting HIGH level to INT pin
* for 2ms~5ms.
*/
error = goodix_irq_direction_output(ts, 1);
if (error)
return error;
usleep_range(2000, 5000);
error = goodix_int_sync(ts);
if (error)
return error;
error = goodix_i2c_read(ts->client, ts->chip->config_addr,
&config_ver, 1);
if (!error && config_ver != ts->config[0])
dev_info(dev, "Config version mismatch %d != %d, resetting controller\n",
config_ver, ts->config[0]);
if (error != 0 || config_ver != ts->config[0]) {
error = goodix_reset(ts);
if (error)
return error;
error = goodix_send_cfg(ts, ts->config, ts->chip->config_len);
if (error)
return error;
}
error = goodix_request_irq(ts);
if (error)
return error;
return 0;
}
static SIMPLE_DEV_PM_OPS(goodix_pm_ops, goodix_suspend, goodix_resume);
static const struct i2c_device_id goodix_ts_id[] = {
{ "GDIX1001:00", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, goodix_ts_id);
#ifdef CONFIG_ACPI
static const struct acpi_device_id goodix_acpi_match[] = {
{ "GDIX1001", 0 },
{ "GDIX1002", 0 },
{ }
};
MODULE_DEVICE_TABLE(acpi, goodix_acpi_match);
#endif
#ifdef CONFIG_OF
static const struct of_device_id goodix_of_match[] = {
{ .compatible = "goodix,gt1151" },
{ .compatible = "goodix,gt1158" },
{ .compatible = "goodix,gt5663" },
{ .compatible = "goodix,gt5688" },
{ .compatible = "goodix,gt911" },
{ .compatible = "goodix,gt9110" },
{ .compatible = "goodix,gt912" },
{ .compatible = "goodix,gt9147" },
{ .compatible = "goodix,gt917s" },
{ .compatible = "goodix,gt927" },
{ .compatible = "goodix,gt9271" },
{ .compatible = "goodix,gt928" },
{ .compatible = "goodix,gt9286" },
{ .compatible = "goodix,gt967" },
{ }
};
MODULE_DEVICE_TABLE(of, goodix_of_match);
#endif
static struct i2c_driver goodix_ts_driver = {
.probe = goodix_ts_probe,
.remove = goodix_ts_remove,
.id_table = goodix_ts_id,
.driver = {
.name = "Goodix-TS",
.acpi_match_table = ACPI_PTR(goodix_acpi_match),
.of_match_table = of_match_ptr(goodix_of_match),
.pm = &goodix_pm_ops,
},
};
module_i2c_driver(goodix_ts_driver);
MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>");
MODULE_DESCRIPTION("Goodix touchscreen driver");
MODULE_LICENSE("GPL v2");