diff options
Diffstat (limited to 'drivers/input/touchscreen/goodix.c')
| -rw-r--r-- | drivers/input/touchscreen/goodix.c | 103 |
1 files changed, 98 insertions, 5 deletions
diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c index cd92d8f..34ed686 100644 --- a/drivers/input/touchscreen/goodix.c +++ b/drivers/input/touchscreen/goodix.c @@ -45,6 +45,7 @@ struct goodix_ts_data { u16 version; const char *cfg_name; struct completion firmware_loading_complete; + unsigned long irq_flags; }; #define GOODIX_GPIO_INT_NAME "irq" @@ -61,6 +62,9 @@ struct goodix_ts_data { #define GOODIX_CONFIG_967_LENGTH 228 /* Register defines */ +#define GOODIX_REG_COMMAND 0x8040 +#define GOODIX_CMD_SCREEN_OFF 0x05 + #define GOODIX_READ_COOR_ADDR 0x814E #define GOODIX_REG_CONFIG_DATA 0x8047 #define GOODIX_REG_ID 0x8140 @@ -162,6 +166,11 @@ static int goodix_i2c_write(struct i2c_client *client, u16 reg, const u8 *buf, return ret < 0 ? ret : (ret != 1 ? -EIO : 0); } +static int goodix_i2c_write_u8(struct i2c_client *client, u16 reg, u8 value) +{ + return goodix_i2c_write(client, reg, &value, sizeof(value)); +} + static int goodix_get_cfg_len(u16 id) { switch (id) { @@ -283,6 +292,18 @@ static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id) 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); +} + /** * goodix_check_cfg - Checks if config fw is valid * @@ -605,7 +626,6 @@ static int goodix_request_input_dev(struct goodix_ts_data *ts) static int goodix_configure_dev(struct goodix_ts_data *ts) { int error; - unsigned long irq_flags; goodix_read_config(ts); @@ -613,10 +633,8 @@ static int goodix_configure_dev(struct goodix_ts_data *ts) if (error) return error; - irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT; - error = devm_request_threaded_irq(&ts->client->dev, ts->client->irq, - NULL, goodix_ts_irq_handler, - irq_flags, ts->client->name, ts); + 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; @@ -737,6 +755,80 @@ static int goodix_ts_remove(struct i2c_client *client) return 0; } +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; + + /* We need gpio pins to suspend/resume */ + if (!ts->gpiod_int || !ts->gpiod_rst) + return 0; + + wait_for_completion(&ts->firmware_loading_complete); + + /* Free IRQ as IRQ pin is used as output in the suspend sequence */ + goodix_free_irq(ts); + + /* Output LOW on the INT pin for 5 ms */ + error = gpiod_direction_output(ts->gpiod_int, 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) { + dev_err(&ts->client->dev, "Screen off command failed\n"); + gpiod_direction_input(ts->gpiod_int); + 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); + int error; + + if (!ts->gpiod_int || !ts->gpiod_rst) + return 0; + + /* + * Exit sleep mode by outputting HIGH level to INT pin + * for 2ms~5ms. + */ + error = gpiod_direction_output(ts->gpiod_int, 1); + if (error) + return error; + + usleep_range(2000, 5000); + + error = goodix_int_sync(ts); + 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 }, { } @@ -773,6 +865,7 @@ static struct i2c_driver goodix_ts_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); |