// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Goodix GT7986U SPI Driver Code for HID.
*
* Copyright (C) 2024 Godix, Inc.
*/
#include <linux/unaligned.h>
#include <linux/delay.h>
#include <linux/hid.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/sizes.h>
#include <linux/spi/spi.h>
#define GOODIX_DEV_CONFIRM_ADDR 0x10000
#define GOODIX_HID_DESC_ADDR 0x1058C
#define GOODIX_HID_REPORT_DESC_ADDR 0x105AA
#define GOODIX_HID_SIGN_ADDR 0x10D32
#define GOODIX_HID_GET_REPORT_CMD 0x02
#define GOODIX_HID_SET_REPORT_CMD 0x03
#define GOODIX_HID_MAX_INBUF_SIZE 128
#define GOODIX_HID_ACK_READY_FLAG 0x01
#define GOODIX_HID_REPORT_READY_FLAG 0x80
#define GOODIX_DEV_CONFIRM_VAL 0xAA
#define GOODIX_SPI_WRITE_FLAG 0xF0
#define GOODIX_SPI_READ_FLAG 0xF1
#define GOODIX_SPI_TRANS_PREFIX_LEN 1
#define GOODIX_REGISTER_WIDTH 4
#define GOODIX_SPI_READ_DUMMY_LEN 3
#define GOODIX_SPI_READ_PREFIX_LEN (GOODIX_SPI_TRANS_PREFIX_LEN + \
GOODIX_REGISTER_WIDTH + \
GOODIX_SPI_READ_DUMMY_LEN)
#define GOODIX_SPI_WRITE_PREFIX_LEN (GOODIX_SPI_TRANS_PREFIX_LEN + \
GOODIX_REGISTER_WIDTH)
#define GOODIX_CHECKSUM_SIZE sizeof(u16)
#define GOODIX_NORMAL_RESET_DELAY_MS 150
struct goodix_hid_report_header {
u8 flag;
__le16 size;
} __packed;
#define GOODIX_HID_ACK_HEADER_SIZE sizeof(struct goodix_hid_report_header)
struct goodix_hid_report_package {
__le16 size;
u8 data[];
};
#define GOODIX_HID_PKG_LEN_SIZE sizeof(u16)
#define GOODIX_HID_COOR_DATA_LEN 82
#define GOODIX_HID_COOR_PKG_LEN (GOODIX_HID_PKG_LEN_SIZE + \
GOODIX_HID_COOR_DATA_LEN)
/* power state */
#define GOODIX_SPI_POWER_ON 0x00
#define GOODIX_SPI_POWER_SLEEP 0x01
/* flags used to record the current device operating state */
#define GOODIX_HID_STARTED 0
struct goodix_hid_report_event {
struct goodix_hid_report_header hdr;
u8 data[GOODIX_HID_COOR_PKG_LEN];
} __packed;
struct goodix_hid_desc {
__le16 desc_length;
__le16 bcd_version;
__le16 report_desc_length;
__le16 report_desc_register;
__le16 input_register;
__le16 max_input_length;
__le16 output_register;
__le16 max_output_length;
__le16 cmd_register;
__le16 data_register;
__le16 vendor_id;
__le16 product_id;
__le16 version_id;
__le32 reserved;
} __packed;
struct goodix_ts_data {
struct device *dev;
struct spi_device *spi;
struct hid_device *hid;
struct goodix_hid_desc hid_desc;
struct gpio_desc *reset_gpio;
u32 hid_report_addr;
unsigned long flags;
/* lock for hid raw request operation */
struct mutex hid_request_lock;
/* buffer used to store hid report event */
u8 *event_buf;
u32 hid_max_event_sz;
/* buffer used to do spi data transfer */
u8 xfer_buf[SZ_2K] ____cacheline_aligned;
};
static void *goodix_get_event_report(struct goodix_ts_data *ts, u32 addr,
u8 *data, size_t len)
{
struct spi_device *spi = to_spi_device(&ts->spi->dev);
struct spi_transfer xfers;
struct spi_message spi_msg;
int error;
/* buffer format: 0xF1 + addr(4bytes) + dummy(3bytes) + data */
data[0] = GOODIX_SPI_READ_FLAG;
put_unaligned_be32(addr, data + GOODIX_SPI_TRANS_PREFIX_LEN);
spi_message_init(&spi_msg);
memset(&xfers, 0, sizeof(xfers));
xfers.tx_buf = data;
xfers.rx_buf = data;
xfers.len = GOODIX_SPI_READ_PREFIX_LEN + len;
spi_message_add_tail(&xfers, &spi_msg);
error = spi_sync(spi, &spi_msg);
if (error) {
dev_err(ts->dev, "spi transfer error: %d", error);
return NULL;
}
return data + GOODIX_SPI_READ_PREFIX_LEN;
}
static int goodix_spi_read(struct goodix_ts_data *ts, u32 addr,
void *data, size_t len)
{
struct spi_device *spi = to_spi_device(&ts->spi->dev);
struct spi_transfer xfers;
struct spi_message spi_msg;
int error;
if (GOODIX_SPI_READ_PREFIX_LEN + len > sizeof(ts->xfer_buf)) {
dev_err(ts->dev, "read data len exceed limit %zu",
sizeof(ts->xfer_buf) - GOODIX_SPI_READ_PREFIX_LEN);
return -EINVAL;
}
/* buffer format: 0xF1 + addr(4bytes) + dummy(3bytes) + data */
ts->xfer_buf[0] = GOODIX_SPI_READ_FLAG;
put_unaligned_be32(addr, ts->xfer_buf + GOODIX_SPI_TRANS_PREFIX_LEN);
spi_message_init(&spi_msg);
memset(&xfers, 0, sizeof(xfers));
xfers.tx_buf = ts->xfer_buf;
xfers.rx_buf = ts->xfer_buf;
xfers.len = GOODIX_SPI_READ_PREFIX_LEN + len;
spi_message_add_tail(&xfers, &spi_msg);
error = spi_sync(spi, &spi_msg);
if (error)
dev_err(ts->dev, "spi transfer error: %d", error);
else
memcpy(data, ts->xfer_buf + GOODIX_SPI_READ_PREFIX_LEN, len);
return error;
}
static int goodix_spi_write(struct goodix_ts_data *ts, u32 addr,
const void *data, size_t len)
{
struct spi_device *spi = to_spi_device(&ts->spi->dev);
struct spi_transfer xfers;
struct spi_message spi_msg;
int error;
if (GOODIX_SPI_WRITE_PREFIX_LEN + len > sizeof(ts->xfer_buf)) {
dev_err(ts->dev, "write data len exceed limit %zu",
sizeof(ts->xfer_buf) - GOODIX_SPI_WRITE_PREFIX_LEN);
return -EINVAL;
}
/* buffer format: 0xF0 + addr(4bytes) + data */
ts->xfer_buf[0] = GOODIX_SPI_WRITE_FLAG;
put_unaligned_be32(addr, ts->xfer_buf + GOODIX_SPI_TRANS_PREFIX_LEN);
memcpy(ts->xfer_buf + GOODIX_SPI_WRITE_PREFIX_LEN, data, len);
spi_message_init(&spi_msg);
memset(&xfers, 0, sizeof(xfers));
xfers.tx_buf = ts->xfer_buf;
xfers.len = GOODIX_SPI_WRITE_PREFIX_LEN + len;
spi_message_add_tail(&xfers, &spi_msg);
error = spi_sync(spi, &spi_msg);
if (error)
dev_err(ts->dev, "spi transfer error: %d", error);
return error;
}
static int goodix_dev_confirm(struct goodix_ts_data *ts)
{
u8 tx_buf[8], rx_buf[8];
int retry = 3;
int error;
gpiod_set_value_cansleep(ts->reset_gpio, 0);
usleep_range(4000, 4100);
memset(tx_buf, GOODIX_DEV_CONFIRM_VAL, sizeof(tx_buf));
while (retry--) {
error = goodix_spi_write(ts, GOODIX_DEV_CONFIRM_ADDR,
tx_buf, sizeof(tx_buf));
if (error)
return error;
error = goodix_spi_read(ts, GOODIX_DEV_CONFIRM_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(ts->dev, "device confirm failed, rx_buf: %*ph", 8, rx_buf);
return -EINVAL;
}
/**
* goodix_hid_parse() - hid-core .parse() callback
* @hid: hid device instance
*
* This function gets called during call to hid_add_device
*
* Return: 0 on success and non zero on error
*/
static int goodix_hid_parse(struct hid_device *hid)
{
struct goodix_ts_data *ts = hid->driver_data;
u16 rsize;
int error;
rsize = le16_to_cpu(ts->hid_desc.report_desc_length);
if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
dev_err(ts->dev, "invalid report desc size, %d", rsize);
return -EINVAL;
}
u8 *rdesc __free(kfree) = kzalloc(rsize, GFP_KERNEL);
if (!rdesc)
return -ENOMEM;
error = goodix_spi_read(ts, GOODIX_HID_REPORT_DESC_ADDR, rdesc, rsize);
if (error) {
dev_err(ts->dev, "failed get report desc, %d", error);
return error;
}
error = hid_parse_report(hid, rdesc, rsize);
if (error) {
dev_err(ts->dev, "failed parse report, %d", error);
return error;
}
return 0;
}
static int goodix_hid_get_report_length(struct hid_report *report)
{
return ((report->size - 1) >> 3) + 1 +
report->device->report_enum[report->type].numbered + 2;
}
static void goodix_hid_find_max_report(struct hid_device *hid, unsigned int type,
unsigned int *max)
{
struct hid_report *report;
unsigned int size;
list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
size = goodix_hid_get_report_length(report);
if (*max < size)
*max = size;
}
}
static int goodix_hid_start(struct hid_device *hid)
{
struct goodix_ts_data *ts = hid->driver_data;
unsigned int bufsize = GOODIX_HID_COOR_PKG_LEN;
u32 report_size;
goodix_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
goodix_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
goodix_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
report_size = GOODIX_SPI_READ_PREFIX_LEN +
GOODIX_HID_ACK_HEADER_SIZE + bufsize;
if (report_size <= ts->hid_max_event_sz)
return 0;
ts->event_buf = devm_krealloc(ts->dev, ts->event_buf,
report_size, GFP_KERNEL);
if (!ts->event_buf)
return -ENOMEM;
ts->hid_max_event_sz = report_size;
return 0;
}
static void goodix_hid_stop(struct hid_device *hid)
{
hid->claimed = 0;
}
static int goodix_hid_open(struct hid_device *hid)
{
struct goodix_ts_data *ts = hid->driver_data;
set_bit(GOODIX_HID_STARTED, &ts->flags);
return 0;
}
static void goodix_hid_close(struct hid_device *hid)
{
struct goodix_ts_data *ts = hid->driver_data;
clear_bit(GOODIX_HID_STARTED, &ts->flags);
}
/* Return date length of response data */
static int goodix_hid_check_ack_status(struct goodix_ts_data *ts, u32 *resp_len)
{
struct goodix_hid_report_header hdr;
int retry = 20;
int error;
int len;
while (retry--) {
/*
* 3 bytes of hid request response data
* - byte 0: Ack flag, value of 1 for data ready
* - bytes 1-2: Response data length
*/
error = goodix_spi_read(ts, ts->hid_report_addr,
&hdr, sizeof(hdr));
if (!error && (hdr.flag & GOODIX_HID_ACK_READY_FLAG)) {
len = le16_to_cpu(hdr.size);
if (len < GOODIX_HID_PKG_LEN_SIZE) {
dev_err(ts->dev, "hrd.size too short: %d", len);
return -EINVAL;
}
*resp_len = len;
return 0;
}
/* Wait 10ms for another try */
usleep_range(10000, 11000);
}
return -EINVAL;
}
/**
* goodix_hid_get_raw_report() - Process hidraw GET REPORT operation
* @hid: hid device instance
* @reportnum: Report ID
* @buf: Buffer for store the report date
* @len: Length fo report data
* @report_type: Report type
*
* The function for hid_ll_driver.get_raw_report to handle the HIDRAW ioctl
* get report request. The transmitted data follows the standard i2c-hid
* protocol with a specified header.
*
* Return: The length of the data in the buf on success, negative error code
*/
static int goodix_hid_get_raw_report(struct hid_device *hid,
unsigned char reportnum,
u8 *buf, size_t len,
unsigned char report_type)
{
struct goodix_ts_data *ts = hid->driver_data;
u16 data_register = le16_to_cpu(ts->hid_desc.data_register);
u16 cmd_register = le16_to_cpu(ts->hid_desc.cmd_register);
u8 tmp_buf[GOODIX_HID_MAX_INBUF_SIZE];
int tx_len = 0, args_len = 0;
u32 response_data_len;
u8 args[3];
int error;
if (report_type == HID_OUTPUT_REPORT)
return -EINVAL;
if (reportnum == 3) {
/* Get win8 signature data */
error = goodix_spi_read(ts, GOODIX_HID_SIGN_ADDR, buf, len);
if (error) {
dev_err(ts->dev, "failed get win8 sign: %d", error);
return -EINVAL;
}
return len;
}
if (reportnum >= 0x0F)
args[args_len++] = reportnum;
put_unaligned_le16(data_register, args + args_len);
args_len += sizeof(data_register);
/* Clean 3 bytes of hid ack header data */
memset(tmp_buf, 0, GOODIX_HID_ACK_HEADER_SIZE);
tx_len += GOODIX_HID_ACK_HEADER_SIZE;
put_unaligned_le16(cmd_register, tmp_buf + tx_len);
tx_len += sizeof(cmd_register);
tmp_buf[tx_len] = (report_type == HID_FEATURE_REPORT ? 0x03 : 0x01) << 4;
tmp_buf[tx_len] |= reportnum >= 0x0F ? 0x0F : reportnum;
tx_len++;
tmp_buf[tx_len++] = GOODIX_HID_GET_REPORT_CMD;
memcpy(tmp_buf + tx_len, args, args_len);
tx_len += args_len;
/* Step1: write report request info */
error = goodix_spi_write(ts, ts->hid_report_addr, tmp_buf, tx_len);
if (error) {
dev_err(ts->dev, "failed send read feature cmd, %d", error);
return error;
}
/* No need read response data */
if (!len)
return 0;
/* Step2: check response data status */
error = goodix_hid_check_ack_status(ts, &response_data_len);
if (error)
return error;
len = min(len, response_data_len - GOODIX_HID_PKG_LEN_SIZE);
/* Step3: read response data(skip 2bytes of hid pkg length) */
error = goodix_spi_read(ts, ts->hid_report_addr +
GOODIX_HID_ACK_HEADER_SIZE +
GOODIX_HID_PKG_LEN_SIZE, buf, len);
if (error) {
dev_err(ts->dev, "failed read hid response data, %d", error);
return error;
}
if (buf[0] != reportnum) {
dev_err(ts->dev, "incorrect report (%d vs %d expected)",
buf[0], reportnum);
return -EINVAL;
}
return len;
}
/**
* goodix_hid_set_raw_report() - process hidraw SET REPORT operation
* @hid: HID device
* @reportnum: Report ID
* @buf: Buffer for communication
* @len: Length of data in the buffer
* @report_type: Report type
*
* The function for hid_ll_driver.get_raw_report to handle the HIDRAW ioctl
* set report request. The transmitted data follows the standard i2c-hid
* protocol with a specified header.
*
* Return: The length of the data sent, negative error code on failure
*/
static int goodix_hid_set_raw_report(struct hid_device *hid,
unsigned char reportnum,
__u8 *buf, size_t len,
unsigned char report_type)
{
struct goodix_ts_data *ts = hid->driver_data;
u16 data_register = le16_to_cpu(ts->hid_desc.data_register);
u16 cmd_register = le16_to_cpu(ts->hid_desc.cmd_register);
int tx_len = 0, args_len = 0;
u8 tmp_buf[GOODIX_HID_MAX_INBUF_SIZE];
u8 args[5];
int error;
if (reportnum >= 0x0F) {
args[args_len++] = reportnum;
reportnum = 0x0F;
}
put_unaligned_le16(data_register, args + args_len);
args_len += sizeof(data_register);
put_unaligned_le16(GOODIX_HID_PKG_LEN_SIZE + len, args + args_len);
args_len += GOODIX_HID_PKG_LEN_SIZE;
/* Clean 3 bytes of hid ack header data */
memset(tmp_buf, 0, GOODIX_HID_ACK_HEADER_SIZE);
tx_len += GOODIX_HID_ACK_HEADER_SIZE;
put_unaligned_le16(cmd_register, tmp_buf + tx_len);
tx_len += sizeof(cmd_register);
tmp_buf[tx_len++] = ((report_type == HID_FEATURE_REPORT ? 0x03 : 0x02) << 4) | reportnum;
tmp_buf[tx_len++] = GOODIX_HID_SET_REPORT_CMD;
memcpy(tmp_buf + tx_len, args, args_len);
tx_len += args_len;
memcpy(tmp_buf + tx_len, buf, len);
tx_len += len;
error = goodix_spi_write(ts, ts->hid_report_addr, tmp_buf, tx_len);
if (error) {
dev_err(ts->dev, "failed send report: %*ph", tx_len, tmp_buf);
return error;
}
return len;
}
static int goodix_hid_raw_request(struct hid_device *hid,
unsigned char reportnum,
__u8 *buf, size_t len,
unsigned char rtype, int reqtype)
{
struct goodix_ts_data *ts = hid->driver_data;
int error = -EINVAL;
guard(mutex)(&ts->hid_request_lock);
switch (reqtype) {
case HID_REQ_GET_REPORT:
error = goodix_hid_get_raw_report(hid, reportnum, buf,
len, rtype);
break;
case HID_REQ_SET_REPORT:
if (buf[0] == reportnum)
error = goodix_hid_set_raw_report(hid, reportnum,
buf, len, rtype);
break;
default:
break;
}
return error;
}
static struct hid_ll_driver goodix_hid_ll_driver = {
.parse = goodix_hid_parse,
.start = goodix_hid_start,
.stop = goodix_hid_stop,
.open = goodix_hid_open,
.close = goodix_hid_close,
.raw_request = goodix_hid_raw_request
};
static irqreturn_t goodix_hid_irq(int irq, void *data)
{
struct goodix_ts_data *ts = data;
struct goodix_hid_report_event *event;
struct goodix_hid_report_package *pkg;
u16 report_size;
if (!test_bit(GOODIX_HID_STARTED, &ts->flags))
return IRQ_HANDLED;
/*
* First, read buffer with space for header and coordinate package:
* - event header = 3 bytes
* - coordinate event = GOODIX_HID_COOR_PKG_LEN bytes
*
* If the data size info in the event header exceeds
* GOODIX_HID_COOR_PKG_LEN, it means that there are other packages
* besides the coordinate package.
*/
event = goodix_get_event_report(ts, ts->hid_report_addr, ts->event_buf,
GOODIX_HID_ACK_HEADER_SIZE +
GOODIX_HID_COOR_PKG_LEN);
if (!event) {
dev_err(ts->dev, "failed get coordinate data");
return IRQ_HANDLED;
}
/* Check coordinate data valid falg */
if (event->hdr.flag != GOODIX_HID_REPORT_READY_FLAG)
return IRQ_HANDLED;
pkg = (struct goodix_hid_report_package *)event->data;
if (le16_to_cpu(pkg->size) < GOODIX_HID_PKG_LEN_SIZE) {
dev_err(ts->dev, "invalid coordinate event package size, %d",
le16_to_cpu(pkg->size));
return IRQ_HANDLED;
}
hid_input_report(ts->hid, HID_INPUT_REPORT, pkg->data,
le16_to_cpu(pkg->size) - GOODIX_HID_PKG_LEN_SIZE, 1);
report_size = le16_to_cpu(event->hdr.size);
/* Check if there are other packages */
if (report_size <= GOODIX_HID_COOR_PKG_LEN)
return IRQ_HANDLED;
if (report_size >= ts->hid_max_event_sz) {
dev_err(ts->dev, "package size exceed limit %d vs %d",
report_size, ts->hid_max_event_sz);
return IRQ_HANDLED;
}
/* Read the package behind the coordinate data */
pkg = goodix_get_event_report(ts, ts->hid_report_addr + sizeof(*event),
ts->event_buf,
report_size - GOODIX_HID_COOR_PKG_LEN);
if (!pkg) {
dev_err(ts->dev, "failed read attachment data content");
return IRQ_HANDLED;
}
hid_input_report(ts->hid, HID_INPUT_REPORT, pkg->data,
le16_to_cpu(pkg->size) - GOODIX_HID_PKG_LEN_SIZE, 1);
return IRQ_HANDLED;
}
static int goodix_hid_init(struct goodix_ts_data *ts)
{
struct hid_device *hid;
int error;
/* Get hid descriptor */
error = goodix_spi_read(ts, GOODIX_HID_DESC_ADDR, &ts->hid_desc,
sizeof(ts->hid_desc));
if (error) {
dev_err(ts->dev, "failed get hid desc, %d", error);
return error;
}
hid = hid_allocate_device();
if (IS_ERR(hid))
return PTR_ERR(hid);
hid->driver_data = ts;
hid->ll_driver = &goodix_hid_ll_driver;
hid->bus = BUS_SPI;
hid->dev.parent = &ts->spi->dev;
hid->version = le16_to_cpu(ts->hid_desc.bcd_version);
hid->vendor = le16_to_cpu(ts->hid_desc.vendor_id);
hid->product = le16_to_cpu(ts->hid_desc.product_id);
snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X", "hid-gdix",
hid->vendor, hid->product);
error = hid_add_device(hid);
if (error) {
dev_err(ts->dev, "failed add hid device, %d", error);
hid_destroy_device(hid);
return error;
}
ts->hid = hid;
return 0;
}
static int goodix_spi_probe(struct spi_device *spi)
{
struct device *dev = &spi->dev;
struct goodix_ts_data *ts;
int error;
/* init spi_device */
spi->mode = SPI_MODE_0;
spi->bits_per_word = 8;
error = spi_setup(spi);
if (error)
return error;
ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
if (!ts)
return -ENOMEM;
mutex_init(&ts->hid_request_lock);
spi_set_drvdata(spi, ts);
ts->spi = spi;
ts->dev = dev;
ts->hid_max_event_sz = GOODIX_SPI_READ_PREFIX_LEN +
GOODIX_HID_ACK_HEADER_SIZE + GOODIX_HID_COOR_PKG_LEN;
ts->event_buf = devm_kmalloc(dev, ts->hid_max_event_sz, GFP_KERNEL);
if (!ts->event_buf)
return -ENOMEM;
ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(ts->reset_gpio))
return dev_err_probe(dev, PTR_ERR(ts->reset_gpio),
"failed to request reset gpio\n");
error = device_property_read_u32(dev, "goodix,hid-report-addr",
&ts->hid_report_addr);
if (error)
return dev_err_probe(dev, error,
"failed get hid report addr\n");
error = goodix_dev_confirm(ts);
if (error)
return error;
/* Waits 150ms for firmware to fully boot */
msleep(GOODIX_NORMAL_RESET_DELAY_MS);
error = goodix_hid_init(ts);
if (error) {
dev_err(dev, "failed init hid device");
return error;
}
error = devm_request_threaded_irq(&ts->spi->dev, ts->spi->irq,
NULL, goodix_hid_irq, IRQF_ONESHOT,
"goodix_spi_hid", ts);
if (error) {
dev_err(ts->dev, "could not register interrupt, irq = %d, %d",
ts->spi->irq, error);
goto err_destroy_hid;
}
return 0;
err_destroy_hid:
hid_destroy_device(ts->hid);
return error;
}
static void goodix_spi_remove(struct spi_device *spi)
{
struct goodix_ts_data *ts = spi_get_drvdata(spi);
disable_irq(spi->irq);
hid_destroy_device(ts->hid);
}
static int goodix_spi_set_power(struct goodix_ts_data *ts, int power_state)
{
u8 power_control_cmd[] = {0x00, 0x00, 0x00, 0x87, 0x02, 0x00, 0x08};
int error;
/* value 0 for power on, 1 for power sleep */
power_control_cmd[5] = power_state;
guard(mutex)(&ts->hid_request_lock);
error = goodix_spi_write(ts, ts->hid_report_addr, power_control_cmd,
sizeof(power_control_cmd));
if (error) {
dev_err(ts->dev, "failed set power mode: %s",
power_state == GOODIX_SPI_POWER_ON ? "on" : "sleep");
return error;
}
return 0;
}
static int goodix_spi_suspend(struct device *dev)
{
struct goodix_ts_data *ts = dev_get_drvdata(dev);
disable_irq(ts->spi->irq);
return goodix_spi_set_power(ts, GOODIX_SPI_POWER_SLEEP);
}
static int goodix_spi_resume(struct device *dev)
{
struct goodix_ts_data *ts = dev_get_drvdata(dev);
enable_irq(ts->spi->irq);
return goodix_spi_set_power(ts, GOODIX_SPI_POWER_ON);
}
static DEFINE_SIMPLE_DEV_PM_OPS(goodix_spi_pm_ops,
goodix_spi_suspend, goodix_spi_resume);
#ifdef CONFIG_ACPI
static const struct acpi_device_id goodix_spi_acpi_match[] = {
{ "GXTS7986" },
{ },
};
MODULE_DEVICE_TABLE(acpi, goodix_spi_acpi_match);
#endif
static const struct spi_device_id goodix_spi_ids[] = {
{ "gt7986u" },
{ },
};
MODULE_DEVICE_TABLE(spi, goodix_spi_ids);
static struct spi_driver goodix_spi_driver = {
.driver = {
.name = "goodix-spi-hid",
.acpi_match_table = ACPI_PTR(goodix_spi_acpi_match),
.pm = pm_sleep_ptr(&goodix_spi_pm_ops),
},
.probe = goodix_spi_probe,
.remove = goodix_spi_remove,
.id_table = goodix_spi_ids,
};
module_spi_driver(goodix_spi_driver);
MODULE_DESCRIPTION("Goodix SPI driver for HID touchscreen");
MODULE_AUTHOR("Goodix, Inc.");
MODULE_LICENSE("GPL");
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