[PATCH v3 4/5] media: adv7604: Add support for i2c_new_secondary_device

Kieran Bingham
2018-02-12T22:08:57Z

From: Jean-Michel Hautbois <jean-michel.hautbois@vodalys.com>

The ADV7604 has thirteen 256-byte maps that can be accessed via the main
I²C ports. Each map has it own I²C address and acts as a standard slave
device on the I²C bus.

Allow a device tree node to override the default addresses so that
address conflicts with other devices on the same bus may be resolved at
the board description level.

Signed-off-by: Jean-Michel Hautbois <jean-michel.hautbois@vodalys.com>
[Kieran: Re-adapted for mainline]
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
---
Based upon the original posting :
https://lkml.org/lkml/2014/10/22/469

v2:
- Split out DT bindings from driver updates
- Return -EINVAL on error paths from adv76xx_dummy_client()

drivers/media/i2c/adv7604.c | 62 +++++++++++++++++++++++++++++----------------
1 file changed, 40 insertions(+), 22 deletions(-)

diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c
index 1544920ec52d..872e124793f8 100644
--- a/drivers/media/i2c/adv7604.c
+++ b/drivers/media/i2c/adv7604.c
@@ -2734,6 +2734,27 @@ static const struct v4l2_ctrl_config adv76xx_ctrl_free_run_color = {

/* ----------------------------------------------------------------------- */

+struct adv76xx_register {
+ const char *name;
+ u8 default_addr;
+};
+
+static const struct adv76xx_register adv76xx_secondary_names[] = {
+ [ADV76XX_PAGE_IO] = { "main", 0x4c },
+ [ADV7604_PAGE_AVLINK] = { "avlink", 0x42 },
+ [ADV76XX_PAGE_CEC] = { "cec", 0x40 },
+ [ADV76XX_PAGE_INFOFRAME] = { "infoframe", 0x3e },
+ [ADV7604_PAGE_ESDP] = { "esdp", 0x38 },
+ [ADV7604_PAGE_DPP] = { "dpp", 0x3c },
+ [ADV76XX_PAGE_AFE] = { "afe", 0x26 },
+ [ADV76XX_PAGE_REP] = { "rep", 0x32 },
+ [ADV76XX_PAGE_EDID] = { "edid", 0x36 },
+ [ADV76XX_PAGE_HDMI] = { "hdmi", 0x34 },
+ [ADV76XX_PAGE_TEST] = { "test", 0x30 },
+ [ADV76XX_PAGE_CP] = { "cp", 0x22 },
+ [ADV7604_PAGE_VDP] = { "vdp", 0x24 },
+};
+
static int adv76xx_core_init(struct v4l2_subdev *sd)
{
struct adv76xx_state *state = to_state(sd);
@@ -2834,13 +2855,26 @@ static void adv76xx_unregister_clients(struct adv76xx_state *state)
}

static struct i2c_client *adv76xx_dummy_client(struct v4l2_subdev *sd,
- u8 addr, u8 io_reg)
+ unsigned int i)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
+ struct adv76xx_state *state = to_state(sd);
+ struct adv76xx_platform_data *pdata = &state->pdata;
+ unsigned int io_reg = 0xf2 + i;
+ struct i2c_client *new_client;
+
+ if (pdata && pdata->i2c_addresses[i])
+ new_client = i2c_new_dummy(client->adapter,
+ pdata->i2c_addresses[i]);
+ else
+ new_client = i2c_new_secondary_device(client,
+ adv76xx_secondary_names[i].name,
+ adv76xx_secondary_names[i].default_addr);

- if (addr)
- io_write(sd, io_reg, addr << 1);
- return i2c_new_dummy(client->adapter, io_read(sd, io_reg) >> 1);
+ if (new_client)
+ io_write(sd, io_reg, new_client->addr << 1);
+
+ return new_client;
}

static const struct adv76xx_reg_seq adv7604_recommended_settings_afe[] = {
@@ -3115,20 +3149,6 @@ static int adv76xx_parse_dt(struct adv76xx_state *state)
/* Disable the interrupt for now as no DT-based board uses it. */
state->pdata.int1_config = ADV76XX_INT1_CONFIG_DISABLED;

- /* Use the default I2C addresses. */
- state->pdata.i2c_addresses[ADV7604_PAGE_AVLINK] = 0x42;
- state->pdata.i2c_addresses[ADV76XX_PAGE_CEC] = 0x40;
- state->pdata.i2c_addresses[ADV76XX_PAGE_INFOFRAME] = 0x3e;
- state->pdata.i2c_addresses[ADV7604_PAGE_ESDP] = 0x38;
- state->pdata.i2c_addresses[ADV7604_PAGE_DPP] = 0x3c;
- state->pdata.i2c_addresses[ADV76XX_PAGE_AFE] = 0x26;
- state->pdata.i2c_addresses[ADV76XX_PAGE_REP] = 0x32;
- state->pdata.i2c_addresses[ADV76XX_PAGE_EDID] = 0x36;
- state->pdata.i2c_addresses[ADV76XX_PAGE_HDMI] = 0x34;
- state->pdata.i2c_addresses[ADV76XX_PAGE_TEST] = 0x30;
- state->pdata.i2c_addresses[ADV76XX_PAGE_CP] = 0x22;
- state->pdata.i2c_addresses[ADV7604_PAGE_VDP] = 0x24;
-
/* Hardcode the remaining platform data fields. */
state->pdata.disable_pwrdnb = 0;
state->pdata.disable_cable_det_rst = 0;
@@ -3478,11 +3498,9 @@ static int adv76xx_probe(struct i2c_client *client,
if (!(BIT(i) & state->info->page_mask))
continue;

- state->i2c_clients[i] =
- adv76xx_dummy_client(sd, state->pdata.i2c_addresses[i],
- 0xf2 + i);
+ state->i2c_clients[i] = adv76xx_dummy_client(sd, i);
if (!state->i2c_clients[i]) {
- err = -ENOMEM;
+ err = -EINVAL;
v4l2_err(sd, "failed to create i2c client %u\n", i);
goto err_i2c;
}
--
2.7.4