[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>

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);