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media: i2c: ov5670: Probe GPIOs

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The OV5670 has a powerdown and reset pin, named respectively "PWDN" and
"XSHUTDOWN".

Optionally probe the gpios connected to the pins during the driver probe
routine.

Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Luca Weiss <luca@z3ntu.xyz>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Jacopo Mondi
2023-01-26 17:59:05 +01:00
committed by Mauro Carvalho Chehab
parent cf9ab87991
commit 0a844ab77b
1 changed files with 28 additions and 0 deletions
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28
drivers/media/i2c/ov5670.c
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@@ -3,6 +3,7 @@
#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
@@ -1848,6 +1849,10 @@ struct ov5670 {
/* Regulators */
struct regulator_bulk_data supplies[OV5670_NUM_SUPPLIES];
/* Power-down and reset gpios. */
struct gpio_desc *pwdn_gpio; /* PWDNB pin. */
struct gpio_desc *reset_gpio; /* XSHUTDOWN pin. */
/* To serialize asynchronus callbacks */
struct mutex mutex;
@@ -2500,6 +2505,23 @@ static int ov5670_regulators_probe(struct ov5670 *ov5670)
ov5670->supplies);
}
static int ov5670_gpio_probe(struct ov5670 *ov5670)
{
struct i2c_client *client = v4l2_get_subdevdata(&ov5670->sd);
ov5670->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "powerdown",
GPIOD_OUT_LOW);
if (IS_ERR(ov5670->pwdn_gpio))
return PTR_ERR(ov5670->pwdn_gpio);
ov5670->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
GPIOD_OUT_LOW);
if (IS_ERR(ov5670->reset_gpio))
return PTR_ERR(ov5670->reset_gpio);
return 0;
}
static int ov5670_probe(struct i2c_client *client)
{
struct ov5670 *ov5670;
@@ -2540,6 +2562,12 @@ static int ov5670_probe(struct i2c_client *client)
goto error_print;
}
ret = ov5670_gpio_probe(ov5670);
if (ret) {
err_msg = "GPIO probe failed";
goto error_print;
}
full_power = acpi_dev_state_d0(&client->dev);
if (full_power) {
/* Check module identity */