Some targets control the ADV7180 power pin via a gpio, so add
support for "pwdn-gpio" device node and pin control.
Signed-off-by: Steve Longerbeam <steve_longerbeam@xxxxxxxxxx>
---
drivers/media/i2c/adv7180.c | 51 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 51 insertions(+)
diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
index b77b0a4..b3bb19f 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/of_gpio.h>
#include <linux/videodev2.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-event.h>
@@ -192,6 +193,7 @@ struct adv7180_state {
struct media_pad pad;
struct mutex mutex; /* mutual excl. when accessing chip */
int irq;
+ int pwdn_gpio;
v4l2_std_id curr_norm;
bool powered;
bool streaming;
@@ -442,6 +444,19 @@ 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 (!gpio_is_valid(state->pwdn_gpio))
+ return;
+
+ if (on) {
+ gpio_set_value_cansleep(state->pwdn_gpio, 1);
+ usleep_range(5000, 5001);
+ } else {
+ gpio_set_value_cansleep(state->pwdn_gpio, 0);
+ }
+}
+
static int adv7180_set_power(struct adv7180_state *state, bool on)
{
u8 val;
@@ -1185,6 +1200,8 @@ 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);
@@ -1232,6 +1249,34 @@ out_unlock:
return ret;
}
+static int adv7180_of_parse(struct adv7180_state *state)
+{
+ struct i2c_client *client = state->client;
+ struct device_node *np = client->dev.of_node;
+ int ret;
+
+ ret = of_get_named_gpio(np, "pwdn-gpio", 0);
+
+ if (gpio_is_valid(ret)) {
+ state->pwdn_gpio = ret;
+ ret = devm_gpio_request_one(&client->dev,
+ state->pwdn_gpio,
+ GPIOF_OUT_INIT_HIGH,
+ "adv7180_pwdn");
+ if (ret < 0) {
+ v4l_err(client, "request for power pin failed\n");
+ return ret;
+ }
+ } else {
+ if (ret == -EPROBE_DEFER)
+ return ret;
+ /* assume a power-down gpio is not required */
+ state->pwdn_gpio = -1;
+ }
+
+ return 0;
+}
+
static int adv7180_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -1254,6 +1299,10 @@ 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);
@@ -1345,6 +1394,8 @@ 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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