From: Petr Hodina <[email protected]> Add support for an optional "reset-gpios" property. If present, the driver drives the reset line high at probe time and releases it during power-on, after the regulators have been enabled.
Signed-off-by: Petr Hodina <[email protected]> Co-developed-by: David Heidelberg <[email protected]> Signed-off-by: David Heidelberg <[email protected]> --- drivers/input/touchscreen/stmfts.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/input/touchscreen/stmfts.c b/drivers/input/touchscreen/stmfts.c index 9dedccbb183ed..a4d8e81aba275 100644 --- a/drivers/input/touchscreen/stmfts.c +++ b/drivers/input/touchscreen/stmfts.c @@ -77,6 +77,7 @@ static const struct regulator_bulk_data stmfts_supplies[] = { struct stmfts_data { struct i2c_client *client; struct input_dev *input; + struct gpio_desc *reset_gpio; struct led_classdev led_cdev; struct mutex mutex; @@ -540,6 +541,15 @@ static int stmfts_read_system_info(struct stmfts_data *sdata) return 0; } +static void stmfts_reset(struct stmfts_data *sdata) +{ + gpiod_set_value_cansleep(sdata->reset_gpio, 1); + msleep(20); + + gpiod_set_value_cansleep(sdata->reset_gpio, 0); + msleep(50); +} + static int stmfts_power_on(struct stmfts_data *sdata) { int err; @@ -549,6 +559,9 @@ static int stmfts_power_on(struct stmfts_data *sdata) if (err) return err; + if (sdata->reset_gpio) + stmfts_reset(sdata); + /* * The datasheet does not specify the power on time, but considering * that the reset time is < 10ms, I sleep 20ms to be sure @@ -607,6 +620,10 @@ static void stmfts_power_off(void *data) struct stmfts_data *sdata = data; disable_irq(sdata->client->irq); + + if (sdata->reset_gpio) + gpiod_set_value_cansleep(sdata->reset_gpio, 1); + regulator_bulk_disable(ARRAY_SIZE(stmfts_supplies), sdata->supplies); } @@ -663,6 +680,12 @@ static int stmfts_probe(struct i2c_client *client) if (err) return err; + sdata->reset_gpio = devm_gpiod_get_optional(dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(sdata->reset_gpio)) + return dev_err_probe(dev, PTR_ERR(sdata->reset_gpio), + "Failed to get GPIO 'reset'\n"); + sdata->input = devm_input_allocate_device(dev); if (!sdata->input) return -ENOMEM; -- 2.51.0
