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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2014-01-30 18:37:08 -0300
committerMauro Carvalho Chehab <m.chehab@samsung.com>2014-05-25 13:02:45 -0300
commite9d50e9e7051a67783d75cd57ce360818b07d37b (patch)
treea6c0770da707de18e94622e2dd7a874480908b90
parentc72a53ce059394749b6db067ba78ad2a317fd7e6 (diff)
[media] adv7604: Support hot-plug detect control through a GPIO
Add support for optional GPIO-controlled HPD pins in addition to the ADV7604-specific hotplug notifier. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
-rw-r--r--drivers/media/i2c/adv7604.c37
1 files changed, 33 insertions, 4 deletions
diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c
index 9ebe44c861c9..b14dc7d4b7bb 100644
--- a/drivers/media/i2c/adv7604.c
+++ b/drivers/media/i2c/adv7604.c
@@ -28,6 +28,7 @@
*/
#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -135,6 +136,8 @@ struct adv7604_state {
const struct adv7604_chip_info *info;
struct adv7604_platform_data pdata;
+ struct gpio_desc *hpd_gpio[4];
+
struct v4l2_subdev sd;
struct media_pad pads[ADV7604_PAD_MAX];
unsigned int source_pad;
@@ -598,6 +601,20 @@ static inline int edid_write_block(struct v4l2_subdev *sd,
return err;
}
+static void adv7604_set_hpd(struct adv7604_state *state, unsigned int hpd)
+{
+ unsigned int i;
+
+ for (i = 0; i < state->info->num_dv_ports; ++i) {
+ if (IS_ERR(state->hpd_gpio[i]))
+ continue;
+
+ gpiod_set_value_cansleep(state->hpd_gpio[i], hpd & BIT(i));
+ }
+
+ v4l2_subdev_notify(&state->sd, ADV7604_HOTPLUG, &hpd);
+}
+
static void adv7604_delayed_work_enable_hotplug(struct work_struct *work)
{
struct delayed_work *dwork = to_delayed_work(work);
@@ -607,7 +624,7 @@ static void adv7604_delayed_work_enable_hotplug(struct work_struct *work)
v4l2_dbg(2, debug, sd, "%s: enable hotplug\n", __func__);
- v4l2_subdev_notify(sd, ADV7604_HOTPLUG, (void *)&state->edid.present);
+ adv7604_set_hpd(state, state->edid.present);
}
static inline int hdmi_read(struct v4l2_subdev *sd, u8 reg)
@@ -2047,7 +2064,6 @@ static int adv7604_set_edid(struct v4l2_subdev *sd, struct v4l2_edid *edid)
struct adv7604_state *state = to_state(sd);
const struct adv7604_chip_info *info = state->info;
int spa_loc;
- int tmp = 0;
int err;
int i;
@@ -2058,7 +2074,7 @@ static int adv7604_set_edid(struct v4l2_subdev *sd, struct v4l2_edid *edid)
if (edid->blocks == 0) {
/* Disable hotplug and I2C access to EDID RAM from DDC port */
state->edid.present &= ~(1 << edid->pad);
- v4l2_subdev_notify(sd, ADV7604_HOTPLUG, (void *)&state->edid.present);
+ adv7604_set_hpd(state, state->edid.present);
rep_write_clr_set(sd, info->edid_enable_reg, 0x0f, state->edid.present);
/* Fall back to a 16:9 aspect ratio */
@@ -2082,7 +2098,7 @@ static int adv7604_set_edid(struct v4l2_subdev *sd, struct v4l2_edid *edid)
/* Disable hotplug and I2C access to EDID RAM from DDC port */
cancel_delayed_work_sync(&state->delayed_work_enable_hotplug);
- v4l2_subdev_notify(sd, ADV7604_HOTPLUG, (void *)&tmp);
+ adv7604_set_hpd(state, 0);
rep_write_clr_set(sd, info->edid_enable_reg, 0x0f, 0x00);
spa_loc = get_edid_spa_location(edid->edid);
@@ -2678,6 +2694,19 @@ static int adv7604_probe(struct i2c_client *client,
return -ENODEV;
}
state->pdata = *pdata;
+
+ /* Request GPIOs. */
+ for (i = 0; i < state->info->num_dv_ports; ++i) {
+ state->hpd_gpio[i] =
+ devm_gpiod_get_index(&client->dev, "hpd", i);
+ if (IS_ERR(state->hpd_gpio[i]))
+ continue;
+
+ gpiod_set_value_cansleep(state->hpd_gpio[i], 0);
+
+ v4l_info(client, "Handling HPD %u GPIO\n", i);
+ }
+
state->timings = cea640x480;
state->format = adv7604_format_info(state, V4L2_MBUS_FMT_YUYV8_2X8);

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