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| author | Steve Longerbeam <slongerbeam@gmail.com> | 2016-07-19 21:03:32 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-08-24 09:43:40 -0300 |
| commit | 65d9e14a659520c554feea8ef17ee3109bd67ebd (patch) | |
| tree | f74c2cb3ccb07deccaf27f2c8e22a85a8b5c526d /drivers/media/i2c | |
| parent | ce5d6290df665bc4931ad01c38bbd4431318eec3 (diff) | |
| download | linux-65d9e14a659520c554feea8ef17ee3109bd67ebd.tar.gz linux-65d9e14a659520c554feea8ef17ee3109bd67ebd.tar.bz2 linux-65d9e14a659520c554feea8ef17ee3109bd67ebd.zip | |
[media] media: adv7180: add power pin control
Some targets control the ADV7180 power pin via a gpio, so add
optional support for "powerdown" pin control.
Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Tested-by: Tim Harvey <tharvey@gateworks.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media/i2c')
| -rw-r--r-- | drivers/media/i2c/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/media/i2c/adv7180.c | 27 |
2 files changed, 28 insertions, 1 deletions
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig index c4df15a43d61..92cc54401339 100644 --- a/drivers/media/i2c/Kconfig +++ b/drivers/media/i2c/Kconfig @@ -187,7 +187,7 @@ comment "Video decoders" config VIDEO_ADV7180 tristate "Analog Devices ADV7180 decoder" - depends on VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API + depends on GPIOLIB && VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API ---help--- Support for the Analog Devices ADV7180 video decoder. diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c index cb83ebbe5131..c367ad6f6327 100644 --- a/drivers/media/i2c/adv7180.c +++ b/drivers/media/i2c/adv7180.c @@ -26,6 +26,7 @@ #include <linux/i2c.h> #include <linux/slab.h> #include <linux/of.h> +#include <linux/gpio/consumer.h> #include <linux/videodev2.h> #include <media/v4l2-ioctl.h> #include <media/v4l2-event.h> @@ -213,6 +214,7 @@ struct adv7180_state { struct media_pad pad; struct mutex mutex; /* mutual excl. when accessing chip */ int irq; + struct gpio_desc *pwdn_gpio; v4l2_std_id curr_norm; bool powered; bool streaming; @@ -463,6 +465,19 @@ static int adv7180_g_std(struct v4l2_subdev *sd, v4l2_std_id *norm) return 0; } +static void adv7180_set_power_pin(struct adv7180_state *state, bool on) +{ + if (!state->pwdn_gpio) + return; + + if (on) { + gpiod_set_value_cansleep(state->pwdn_gpio, 0); + usleep_range(5000, 10000); + } else { + gpiod_set_value_cansleep(state->pwdn_gpio, 1); + } +} + static int adv7180_set_power(struct adv7180_state *state, bool on) { u8 val; @@ -1210,6 +1225,8 @@ static int init_device(struct adv7180_state *state) mutex_lock(&state->mutex); + adv7180_set_power_pin(state, true); + adv7180_write(state, ADV7180_REG_PWR_MAN, ADV7180_PWR_MAN_RES); usleep_range(5000, 10000); @@ -1279,6 +1296,14 @@ static int adv7180_probe(struct i2c_client *client, state->field = V4L2_FIELD_INTERLACED; state->chip_info = (struct adv7180_chip_info *)id->driver_data; + state->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "powerdown", + GPIOD_OUT_HIGH); + if (IS_ERR(state->pwdn_gpio)) { + ret = PTR_ERR(state->pwdn_gpio); + v4l_err(client, "request for power pin failed: %d\n", ret); + return ret; + } + if (state->chip_info->flags & ADV7180_FLAG_MIPI_CSI2) { state->csi_client = i2c_new_dummy(client->adapter, ADV7180_DEFAULT_CSI_I2C_ADDR); @@ -1370,6 +1395,8 @@ static int adv7180_remove(struct i2c_client *client) if (state->chip_info->flags & ADV7180_FLAG_MIPI_CSI2) i2c_unregister_device(state->csi_client); + adv7180_set_power_pin(state, false); + mutex_destroy(&state->mutex); return 0; |