diff options
| author | Vlad Dogaru <vlad.dogaru@intel.com> | 2015-04-12 19:09:21 +0200 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2015-04-18 21:14:54 +0200 |
| commit | 45fd5f8e10d3b5bdff577b82db4b9dd78d4b60a3 (patch) | |
| tree | 3fdde481c309840faf239c101960916016ba68d7 | |
| parent | iio: sx9500: refactor GPIO interrupt code (diff) | |
| download | linux-45fd5f8e10d3b5bdff577b82db4b9dd78d4b60a3.tar.xz linux-45fd5f8e10d3b5bdff577b82db4b9dd78d4b60a3.zip | |
iio: sx9500: add GPIO reset pin
If a GPIO reset pin is listed in ACPI or Device Tree, use it to reset
the device on initialization.
Signed-off-by: Vlad Dogaru <vlad.dogaru@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
| -rw-r--r-- | drivers/iio/proximity/sx9500.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/iio/proximity/sx9500.c b/drivers/iio/proximity/sx9500.c index 1b3d894e8c69..f1e9d734b6b6 100644 --- a/drivers/iio/proximity/sx9500.c +++ b/drivers/iio/proximity/sx9500.c @@ -33,6 +33,7 @@ #define SX9500_IRQ_NAME "sx9500_event" #define SX9500_GPIO_INT "interrupt" +#define SX9500_GPIO_RESET "reset" /* Register definitions. */ #define SX9500_REG_IRQ_SRC 0x00 @@ -85,6 +86,7 @@ struct sx9500_data { struct i2c_client *client; struct iio_trigger *trig; struct regmap *regmap; + struct gpio_desc *gpiod_rst; /* * Last reading of the proximity status for each channel. We * only send an event to user space when this changes. @@ -829,6 +831,13 @@ static int sx9500_init_device(struct iio_dev *indio_dev) int ret, i; unsigned int val; + if (data->gpiod_rst) { + gpiod_set_value_cansleep(data->gpiod_rst, 0); + usleep_range(1000, 2000); + gpiod_set_value_cansleep(data->gpiod_rst, 1); + usleep_range(1000, 2000); + } + ret = regmap_write(data->regmap, SX9500_REG_IRQ_MSK, 0); if (ret < 0) return ret; @@ -875,6 +884,13 @@ static void sx9500_gpio_probe(struct i2c_client *client, else client->irq = gpiod_to_irq(gpio); } + + data->gpiod_rst = devm_gpiod_get_index(dev, SX9500_GPIO_RESET, + 0, GPIOD_OUT_HIGH); + if (IS_ERR(data->gpiod_rst)) { + dev_warn(dev, "gpio get reset pin failed\n"); + data->gpiod_rst = NULL; + } } static int sx9500_probe(struct i2c_client *client, @@ -898,8 +914,6 @@ static int sx9500_probe(struct i2c_client *client, if (IS_ERR(data->regmap)) return PTR_ERR(data->regmap); - sx9500_init_device(indio_dev); - indio_dev->dev.parent = &client->dev; indio_dev->name = SX9500_DRIVER_NAME; indio_dev->channels = sx9500_channels; @@ -910,6 +924,10 @@ static int sx9500_probe(struct i2c_client *client, sx9500_gpio_probe(client, data); + ret = sx9500_init_device(indio_dev); + if (ret < 0) + return ret; + if (client->irq <= 0) dev_warn(&client->dev, "no valid irq found\n"); else { |