Some targets control the ADV7180 power pin via a gpio, so add
support for "pwdn-gpio" pin control.
Signed-off-by: Steve Longerbeam <steve_longerbeam@xxxxxxxxxx>
---
drivers/media/i2c/Kconfig | 2 +-
drivers/media/i2c/adv7180.c | 37 +++++++++++++++++++++++++++++++++++++
2 files changed, 38 insertions(+), 1 deletion(-)
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 993dc50..80d39f6 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 967303a..38e5161 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 <media/v4l2-ioctl.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
@@ -191,6 +192,7 @@ 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 autodetect;
bool powered;
@@ -443,6 +445,19 @@ 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;
@@ -1143,6 +1158,8 @@ 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);
@@ -1190,6 +1207,20 @@ out_unlock:
return ret;
}
+static int adv7180_of_parse(struct adv7180_state *state)
+{
+ struct i2c_client *client = state->client;
+
+ state->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "pwdn",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(state->pwdn_gpio)) {
+ v4l_err(client, "request for power pin failed\n");
+ return PTR_ERR(state->pwdn_gpio);
+ }
+
+ return 0;
+}
+
static int adv7180_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -1212,6 +1243,10 @@ static int adv7180_probe(struct i2c_client *client,
state->field = V4L2_FIELD_INTERLACED;
state->chip_info = (struct adv7180_chip_info *)id->driver_data;
+ ret = adv7180_of_parse(state);
+ if (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);
@@ -1303,6 +1338,8 @@ 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;
--
1.9.1
--
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