// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Goodix "Berlin" Touchscreen IC driver
* Copyright (C) 2020 - 2021 Goodix, Inc.
* Copyright (C) 2023 Linaro Ltd.
*
* Based on goodix_ts_berlin driver.
*
* This driver is distinct from goodix.c since hardware interface
* is different enough to require a new driver.
* None of the register address or data structure are close enough
* to the previous generations.
*
* Currently the driver only handles Multitouch events with already
* programmed firmware and "config" for "Revision D" Berlin IC.
*
* Support is missing for:
* - ESD Management
* - Firmware update/flashing
* - "Config" update/flashing
* - Stylus Events
* - Gesture Events
* - Support for older revisions (A & B)
*/
#include <linux/bitfield.h>
#include <linux/gpio/consumer.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/sizes.h>
#include <linux/unaligned.h>
#include "goodix_berlin.h"
#define GOODIX_BERLIN_MAX_TOUCH 10
#define GOODIX_BERLIN_NORMAL_RESET_DELAY_MS 100
#define GOODIX_BERLIN_TOUCH_EVENT BIT(7)
#define GOODIX_BERLIN_REQUEST_EVENT BIT(6)
#define GOODIX_BERLIN_TOUCH_COUNT_MASK GENMASK(3, 0)
#define GOODIX_BERLIN_REQUEST_CODE_RESET 3
#define GOODIX_BERLIN_POINT_TYPE_MASK GENMASK(3, 0)
#define GOODIX_BERLIN_POINT_TYPE_STYLUS_HOVER 1
#define GOODIX_BERLIN_POINT_TYPE_STYLUS 3
#define GOODIX_BERLIN_TOUCH_ID_MASK GENMASK(7, 4)
#define GOODIX_BERLIN_DEV_CONFIRM_VAL 0xAA
#define GOODIX_BERLIN_BOOTOPTION_ADDR 0x10000
#define GOODIX_BERLIN_FW_VERSION_INFO_ADDR 0x10014
#define GOODIX_BERLIN_IC_INFO_MAX_LEN SZ_1K
#define GOODIX_BERLIN_IC_INFO_ADDR 0x10070
#define GOODIX_BERLIN_CHECKSUM_SIZE sizeof(u16)
struct goodix_berlin_fw_version {
u8 rom_pid[6];
u8 rom_vid[3];
u8 rom_vid_reserved;
u8 patch_pid[8];
u8 patch_vid[4];
u8 patch_vid_reserved;
u8 sensor_id;
u8 reserved[2];
__le16 checksum;
};
struct goodix_berlin_ic_info_version {
u8 info_customer_id;
u8 info_version_id;
u8 ic_die_id;
u8 ic_version_id;
__le32 config_id;
u8 config_version;
u8 frame_data_customer_id;
u8 frame_data_version_id;
u8 touch_data_customer_id;
u8 touch_data_version_id;
u8 reserved[3];
} __packed;
struct goodix_berlin_ic_info_feature {
__le16 freqhop_feature;
__le16 calibration_feature;
__le16 gesture_feature;
__le16 side_touch_feature;
__le16 stylus_feature;
} __packed;
struct goodix_berlin_ic_info_misc {
__le32 cmd_addr;
__le16 cmd_max_len;
__le32 cmd_reply_addr;
__le16 cmd_reply_len;
__le32 fw_state_addr;
__le16 fw_state_len;
__le32 fw_buffer_addr;
__le16 fw_buffer_max_len;
__le32 frame_data_addr;
__le16 frame_data_head_len;
__le16 fw_attr_len;
__le16 fw_log_len;
u8 pack_max_num;
u8 pack_compress_version;
__le16 stylus_struct_len;
__le16 mutual_struct_len;
__le16 self_struct_len;
__le16 noise_struct_len;
__le32 touch_data_addr;
__le16 touch_data_head_len;
__le16 point_struct_len;
__le16 reserved1;
__le16 reserved2;
__le32 mutual_rawdata_addr;
__le32 mutual_diffdata_addr;
__le32 mutual_refdata_addr;
__le32 self_rawdata_addr;
__le32 self_diffdata_addr;
__le32 self_refdata_addr;
__le32 iq_rawdata_addr;
__le32 iq_refdata_addr;
__le32 im_rawdata_addr;
__le16 im_readata_len;
__le32 noise_rawdata_addr;
__le16 noise_rawdata_len;
__le32 stylus_rawdata_addr;
__le16 stylus_rawdata_len;
__le32 noise_data_addr;
__le32 esd_addr;
} __packed;
struct goodix_berlin_touch {
u8 status;
u8 reserved;
__le16 x;
__le16 y;
__le16 w;
};
#define GOODIX_BERLIN_TOUCH_SIZE sizeof(struct goodix_berlin_touch)
struct goodix_berlin_header {
u8 status;
u8 reserved1;
u8 request_type;
u8 reserved2[3];
__le16 checksum;
};
#define GOODIX_BERLIN_HEADER_SIZE sizeof(struct goodix_berlin_header)
struct goodix_berlin_event {
struct goodix_berlin_header hdr;
/* The data below is u16/__le16 aligned */
u8 data[GOODIX_BERLIN_TOUCH_SIZE * GOODIX_BERLIN_MAX_TOUCH +
GOODIX_BERLIN_CHECKSUM_SIZE];
};
struct goodix_berlin_core {
struct device *dev;
struct regmap *regmap;
struct regulator *avdd;
struct regulator *iovdd;
struct gpio_desc *reset_gpio;
struct touchscreen_properties props;
struct goodix_berlin_fw_version fw_version;
struct input_dev *input_dev;
int irq;
/* Runtime parameters extracted from IC_INFO buffer */
u32 touch_data_addr;
struct goodix_berlin_event event;
};
static bool goodix_berlin_checksum_valid(const u8 *data, int size)
{
u32 cal_checksum = 0;
u16 r_checksum;
int i;
if (size < GOODIX_BERLIN_CHECKSUM_SIZE)
return false;
for (i = 0; i < size - GOODIX_BERLIN_CHECKSUM_SIZE; i++)
cal_checksum += data[i];
r_checksum = get_unaligned_le16(&data[i]);
return (u16)cal_checksum == r_checksum;
}
static bool goodix_berlin_is_dummy_data(struct goodix_berlin_core *cd,
const u8 *data, int size)
{
int i;
/*
* If the device is missing or doesn't respond the buffer
* could be filled with bus default line state, 0x00 or 0xff,
* so declare success the first time we encounter neither.
*/
for (i = 0; i < size; i++)
if (data[i] > 0 && data[i] < 0xff)
return false;
return true;
}
static int goodix_berlin_dev_confirm(struct goodix_berlin_core *cd)
{
u8 tx_buf[8], rx_buf[8];
int retry = 3;
int error;
memset(tx_buf, GOODIX_BERLIN_DEV_CONFIRM_VAL, sizeof(tx_buf));
while (retry--) {
error = regmap_raw_write(cd->regmap,
GOODIX_BERLIN_BOOTOPTION_ADDR,
tx_buf, sizeof(tx_buf));
if (error)
return error;
error = regmap_raw_read(cd->regmap,
GOODIX_BERLIN_BOOTOPTION_ADDR,
rx_buf, sizeof(rx_buf));
if (error)
return error;
if (!memcmp(tx_buf, rx_buf, sizeof(tx_buf)))
return 0;
usleep_range(5000, 5100);
}
dev_err(cd->dev, "device confirm failed, rx_buf: %*ph\n",
(int)sizeof(rx_buf), rx_buf);
return -EINVAL;
}
static int goodix_berlin_power_on(struct goodix_berlin_core *cd)
{
int error;
error = regulator_enable(cd->iovdd);
if (error) {
dev_err(cd->dev, "Failed to enable iovdd: %d\n", error);
return error;
}
/* Vendor waits 3ms for IOVDD to settle */
usleep_range(3000, 3100);
error = regulator_enable(cd->avdd);
if (error) {
dev_err(cd->dev, "Failed to enable avdd: %d\n", error);
goto err_iovdd_disable;
}
/* Vendor waits 15ms for IOVDD to settle */
usleep_range(15000, 15100);
gpiod_set_value_cansleep(cd->reset_gpio, 0);
/* Vendor waits 4ms for Firmware to initialize */
usleep_range(4000, 4100);
error = goodix_berlin_dev_confirm(cd);
if (error)
goto err_dev_reset;
/* Vendor waits 100ms for Firmware to fully boot */
msleep(GOODIX_BERLIN_NORMAL_RESET_DELAY_MS);
return 0;
err_dev_reset:
gpiod_set_value_cansleep(cd->reset_gpio, 1);
regulator_disable(cd->avdd);
err_iovdd_disable:
regulator_disable(cd->iovdd);
return error;
}
static void goodix_berlin_power_off(struct goodix_berlin_core *cd)
{
gpiod_set_value_cansleep(cd->reset_gpio, 1);
regulator_disable(cd->avdd);
regulator_disable(cd->iovdd);
}
static int goodix_berlin_read_version(struct goodix_berlin_core *cd)
{
int error;
error = regmap_raw_read(cd->regmap, GOODIX_BERLIN_FW_VERSION_INFO_ADDR,
&cd->fw_version, sizeof(cd->fw_version));
if (error) {
dev_err(cd->dev, "error reading fw version, %d\n", error);
return error;
}
if (!goodix_berlin_checksum_valid((u8 *)&cd->fw_version,
sizeof(cd->fw_version))) {
dev_err(cd->dev, "invalid fw version: checksum error\n");
return -EINVAL;
}
return 0;
}
/* Only extract necessary data for runtime */
static int goodix_berlin_parse_ic_info(struct goodix_berlin_core *cd,
const u8 *data, u16 length)
{
struct goodix_berlin_ic_info_misc *misc;
unsigned int offset = 0;
offset += sizeof(__le16); /* length */
offset += sizeof(struct goodix_berlin_ic_info_version);
offset += sizeof(struct goodix_berlin_ic_info_feature);
/* IC_INFO Parameters, variable width structure */
offset += 4 * sizeof(u8); /* drv_num, sen_num, button_num, force_num */
if (offset >= length)
goto invalid_offset;
#define ADVANCE_LE16_PARAMS() \
do { \
u8 param_num = data[offset++]; \
offset += param_num * sizeof(__le16); \
if (offset >= length) \
goto invalid_offset; \
} while (0)
ADVANCE_LE16_PARAMS(); /* active_scan_rate_num */
ADVANCE_LE16_PARAMS(); /* mutual_freq_num*/
ADVANCE_LE16_PARAMS(); /* self_tx_freq_num */
ADVANCE_LE16_PARAMS(); /* self_rx_freq_num */
ADVANCE_LE16_PARAMS(); /* stylus_freq_num */
#undef ADVANCE_LE16_PARAMS
misc = (struct goodix_berlin_ic_info_misc *)&data[offset];
cd->touch_data_addr = le32_to_cpu(misc->touch_data_addr);
return 0;
invalid_offset:
dev_err(cd->dev, "ic_info length is invalid (offset %d length %d)\n",
offset, length);
return -EINVAL;
}
static int goodix_berlin_get_ic_info(struct goodix_berlin_core *cd)
{
u8 *afe_data __free(kfree) = NULL;
__le16 length_raw;
u16 length;
int error;
afe_data = kzalloc(GOODIX_BERLIN_IC_INFO_MAX_LEN, GFP_KERNEL);
if (!afe_data)
return -ENOMEM;
error = regmap_raw_read(cd->regmap, GOODIX_BERLIN_IC_INFO_ADDR,
&length_raw, sizeof(length_raw));
if (error) {
dev_err(cd->dev, "failed get ic info length, %d\n", error);
return error;
}
length = le16_to_cpu(length_raw);
if (length >= GOODIX_BERLIN_IC_INFO_MAX_LEN) {
dev_err(cd->dev, "invalid ic info length %d\n", length);
return -EINVAL;
}
error = regmap_raw_read(cd->regmap, GOODIX_BERLIN_IC_INFO_ADDR,
afe_data, length);
if (error) {
dev_err(cd->dev, "failed get ic info data, %d\n", error);
return error;
}
/* check whether the data is valid (ex. bus default values) */
if (goodix_berlin_is_dummy_data(cd, afe_data, length)) {
dev_err(cd->dev, "fw info data invalid\n");
return -EINVAL;
}
if (!goodix_berlin_checksum_valid(afe_data, length)) {
dev_err(cd->dev, "fw info checksum error\n");
return -EINVAL;
}
error = goodix_berlin_parse_ic_info(cd, afe_data, length);
if (error)
return error;
/* check some key info */
if (!cd->touch_data_addr) {
dev_err(cd->dev, "touch_data_addr is null\n");
return -EINVAL;
}
return 0;
}
static int goodix_berlin_get_remaining_contacts(struct goodix_berlin_core *cd,
int n)
{
size_t offset = 2 * GOODIX_BERLIN_TOUCH_SIZE +
GOODIX_BERLIN_CHECKSUM_SIZE;
u32 addr = cd->touch_data_addr + GOODIX_BERLIN_HEADER_SIZE + offset;
int error;
error = regmap_raw_read(cd->regmap, addr,
&cd->event.data[offset],
(n - 2) * GOODIX_BERLIN_TOUCH_SIZE);
if (error) {
dev_err_ratelimited(cd->dev, "failed to get touch data, %d\n",
error);
return error;
}
return 0;
}
static void goodix_berlin_report_state(struct goodix_berlin_core *cd, int n)
{
struct goodix_berlin_touch *touch_data =
(struct goodix_berlin_touch *)cd->event.data;
struct goodix_berlin_touch *t;
int i;
u8 type, id;
for (i = 0; i < n; i++) {
t = &touch_data[i];
type = FIELD_GET(GOODIX_BERLIN_POINT_TYPE_MASK, t->status);
if (type == GOODIX_BERLIN_POINT_TYPE_STYLUS ||
type == GOODIX_BERLIN_POINT_TYPE_STYLUS_HOVER) {
dev_warn_once(cd->dev, "Stylus event type not handled\n");
continue;
}
id = FIELD_GET(GOODIX_BERLIN_TOUCH_ID_MASK, t->status);
if (id >= GOODIX_BERLIN_MAX_TOUCH) {
dev_warn_ratelimited(cd->dev, "invalid finger id %d\n", id);
continue;
}
input_mt_slot(cd->input_dev, id);
input_mt_report_slot_state(cd->input_dev, MT_TOOL_FINGER, true);
touchscreen_report_pos(cd->input_dev, &cd->props,
__le16_to_cpu(t->x), __le16_to_cpu(t->y),
true);
input_report_abs(cd->input_dev, ABS_MT_TOUCH_MAJOR,
__le16_to_cpu(t->w));
}
input_mt_sync_frame(cd->input_dev);
input_sync(cd->input_dev);
}
static void goodix_berlin_touch_handler(struct goodix_berlin_core *cd)
{
u8 touch_num;
int error;
touch_num = FIELD_GET(GOODIX_BERLIN_TOUCH_COUNT_MASK,
cd->event.hdr.request_type);
if (touch_num > GOODIX_BERLIN_MAX_TOUCH) {
dev_warn(cd->dev, "invalid touch num %d\n", touch_num);
return;
}
if (touch_num > 2) {
/* read additional contact data if more than 2 touch events */
error = goodix_berlin_get_remaining_contacts(cd, touch_num);
if (error)
return;
}
if (touch_num) {
int len = touch_num * GOODIX_BERLIN_TOUCH_SIZE +
GOODIX_BERLIN_CHECKSUM_SIZE;
if (!goodix_berlin_checksum_valid(cd->event.data, len)) {
dev_err(cd->dev, "touch data checksum error: %*ph\n",
len, cd->event.data);
return;
}
}
goodix_berlin_report_state(cd, touch_num);
}
static int goodix_berlin_request_handle_reset(struct goodix_berlin_core *cd)
{
gpiod_set_value_cansleep(cd->reset_gpio, 1);
usleep_range(2000, 2100);
gpiod_set_value_cansleep(cd->reset_gpio, 0);
msleep(GOODIX_BERLIN_NORMAL_RESET_DELAY_MS);
return 0;
}
static irqreturn_t goodix_berlin_irq(int irq, void *data)
{
struct goodix_berlin_core *cd = data;
int error;
/*
* First, read buffer with space for 2 touch events:
* - GOODIX_BERLIN_HEADER_SIZE = 8 bytes
* - GOODIX_BERLIN_TOUCH_SIZE * 2 = 16 bytes
* - GOODIX_BERLIN_CHECKLSUM_SIZE = 2 bytes
* For a total of 26 bytes.
*
* If only a single finger is reported, we will read 8 bytes more than
* needed:
* - bytes 0-7: Header (GOODIX_BERLIN_HEADER_SIZE)
* - bytes 8-15: Finger 0 Data
* - bytes 24-25: Checksum
* - bytes 18-25: Unused 8 bytes
*
* If 2 fingers are reported, we would have read the exact needed
* amount of data and checksum would be at the end of the buffer:
* - bytes 0-7: Header (GOODIX_BERLIN_HEADER_SIZE)
* - bytes 8-15: Finger 0 Bytes 0-7
* - bytes 16-23: Finger 1 Bytes 0-7
* - bytes 24-25: Checksum
*
* If more than 2 fingers were reported, the "Checksum" bytes would
* in fact contain part of the next finger data, and then
* goodix_berlin_get_remaining_contacts() would complete the buffer
* with the missing bytes, including the trailing checksum.
* For example, if 3 fingers are reported, then we would do:
* Read 1:
* - bytes 0-7: Header (GOODIX_BERLIN_HEADER_SIZE)
* - bytes 8-15: Finger 0 Bytes 0-7
* - bytes 16-23: Finger 1 Bytes 0-7
* - bytes 24-25: Finger 2 Bytes 0-1
* Read 2 (with length of (3 - 2) * 8 = 8 bytes):
* - bytes 26-31: Finger 2 Bytes 2-7
* - bytes 32-33: Checksum
*/
error = regmap_raw_read(cd->regmap, cd->touch_data_addr,
&cd->event,
GOODIX_BERLIN_HEADER_SIZE +
2 * GOODIX_BERLIN_TOUCH_SIZE +
GOODIX_BERLIN_CHECKSUM_SIZE);
if (error) {
dev_warn_ratelimited(cd->dev,
"failed get event head data: %d\n", error);
goto out;
}
if (cd->event.hdr.status == 0)
goto out;
if (!goodix_berlin_checksum_valid((u8 *)&cd->event.hdr,
GOODIX_BERLIN_HEADER_SIZE)) {
dev_warn_ratelimited(cd->dev,
"touch head checksum error: %*ph\n",
(int)GOODIX_BERLIN_HEADER_SIZE,
&cd->event.hdr);
goto out_clear;
}
if (cd->event.hdr.status & GOODIX_BERLIN_TOUCH_EVENT)
goodix_berlin_touch_handler(cd);
if (cd->event.hdr.status & GOODIX_BERLIN_REQUEST_EVENT) {
switch (cd->event.hdr.request_type) {
case GOODIX_BERLIN_REQUEST_CODE_RESET:
if (cd->reset_gpio)
goodix_berlin_request_handle_reset(cd);
break;
default:
dev_warn(cd->dev, "unsupported request code 0x%x\n",
cd->event.hdr.request_type);
}
}
out_clear:
/* Clear up status field */
regmap_write(cd->regmap, cd->touch_data_addr, 0);
out:
return IRQ_HANDLED;
}
static int goodix_berlin_input_dev_config(struct goodix_berlin_core *cd,
const struct input_id *id)
{
struct input_dev *input_dev;
int error;
input_dev = devm_input_allocate_device(cd->dev);
if (!input_dev)
return -ENOMEM;
cd->input_dev = input_dev;
input_set_drvdata(input_dev, cd);
input_dev->name = "Goodix Berlin Capacitive TouchScreen";
input_dev->phys = "input/ts";
input_dev->id = *id;
input_set_abs_params(cd->input_dev, ABS_MT_POSITION_X,
0, SZ_64K - 1, 0, 0);
input_set_abs_params(cd->input_dev, ABS_MT_POSITION_Y,
0, SZ_64K - 1, 0, 0);
input_set_abs_params(cd->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
touchscreen_parse_properties(cd->input_dev, true, &cd->props);
error = input_mt_init_slots(cd->input_dev, GOODIX_BERLIN_MAX_TOUCH,
INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
if (error)
return error;
error = input_register_device(cd->input_dev);
if (error)
return error;
return 0;
}
static int goodix_berlin_suspend(struct device *dev)
{
struct goodix_berlin_core *cd = dev_get_drvdata(dev);
disable_irq(cd->irq);
goodix_berlin_power_off(cd);
return 0;
}
static int goodix_berlin_resume(struct device *dev)
{
struct goodix_berlin_core *cd = dev_get_drvdata(dev);
int error;
error = goodix_berlin_power_on(cd);
if (error)
return error;
enable_irq(cd->irq);
return 0;
}
EXPORT_GPL_SIMPLE_DEV_PM_OPS(goodix_berlin_pm_ops,
goodix_berlin_suspend, goodix_berlin_resume);
static void goodix_berlin_power_off_act(void *data)
{
struct goodix_berlin_core *cd = data;
goodix_berlin_power_off(cd);
}
static ssize_t registers_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count)
{
struct device *dev = kobj_to_dev(kobj);
struct goodix_berlin_core *cd = dev_get_drvdata(dev);
int error;
error = regmap_raw_read(cd->regmap, off, buf, count);
return error ? error : count;
}
static ssize_t registers_write(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count)
{
struct device *dev = kobj_to_dev(kobj);
struct goodix_berlin_core *cd = dev_get_drvdata(dev);
int error;
error = regmap_raw_write(cd->regmap, off, buf, count);
return error ? error : count;
}
static BIN_ATTR_ADMIN_RW(registers, 0);
static struct bin_attribute *goodix_berlin_bin_attrs[] = {
&bin_attr_registers,
NULL,
};
static const struct attribute_group goodix_berlin_attr_group = {
.bin_attrs = goodix_berlin_bin_attrs,
};
const struct attribute_group *goodix_berlin_groups[] = {
&goodix_berlin_attr_group,
NULL,
};
EXPORT_SYMBOL_GPL(goodix_berlin_groups);
int goodix_berlin_probe(struct device *dev, int irq, const struct input_id *id,
struct regmap *regmap)
{
struct goodix_berlin_core *cd;
int error;
if (irq <= 0) {
dev_err(dev, "Missing interrupt number\n");
return -EINVAL;
}
cd = devm_kzalloc(dev, sizeof(*cd), GFP_KERNEL);
if (!cd)
return -ENOMEM;
cd->dev = dev;
cd->regmap = regmap;
cd->irq = irq;
cd->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(cd->reset_gpio))
return dev_err_probe(dev, PTR_ERR(cd->reset_gpio),
"Failed to request reset gpio\n");
cd->avdd = devm_regulator_get(dev, "avdd");
if (IS_ERR(cd->avdd))
return dev_err_probe(dev, PTR_ERR(cd->avdd),
"Failed to request avdd regulator\n");
cd->iovdd = devm_regulator_get(dev, "iovdd");
if (IS_ERR(cd->iovdd))
return dev_err_probe(dev, PTR_ERR(cd->iovdd),
"Failed to request iovdd regulator\n");
error = goodix_berlin_power_on(cd);
if (error) {
dev_err(dev, "failed power on");
return error;
}
error = devm_add_action_or_reset(dev, goodix_berlin_power_off_act, cd);
if (error)
return error;
error = goodix_berlin_read_version(cd);
if (error) {
dev_err(dev, "failed to get version info");
return error;
}
error = goodix_berlin_get_ic_info(cd);
if (error) {
dev_err(dev, "invalid ic info, abort");
return error;
}
error = goodix_berlin_input_dev_config(cd, id);
if (error) {
dev_err(dev, "failed set input device");
return error;
}
error = devm_request_threaded_irq(dev, cd->irq, NULL, goodix_berlin_irq,
IRQF_ONESHOT, "goodix-berlin", cd);
if (error) {
dev_err(dev, "request threaded irq failed: %d\n", error);
return error;
}
dev_set_drvdata(dev, cd);
dev_dbg(dev, "Goodix Berlin %s Touchscreen Controller",
cd->fw_version.patch_pid);
return 0;
}
EXPORT_SYMBOL_GPL(goodix_berlin_probe);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Goodix Berlin Core Touchscreen driver");
MODULE_AUTHOR("Neil Armstrong <[email protected]>");
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