Hi Yassine,
On Mon, Jul 11, 2022 at 06:40:39PM +0400, Yassine Oudjana wrote:
> From: Yassine Oudjana <y.oudjana@xxxxxxxxxxxxxx>
>
> Make the driver get needed regulators on probe and enable/disable
> them on runtime PM callbacks.
>
> Signed-off-by: Yassine Oudjana <y.oudjana@xxxxxxxxxxxxxx>
> ---
> Changes since v1:
> - Reorganize variable declaration
> - Change the power-on delay range to 3000-3500 microseconds.
>
> drivers/media/i2c/ak7375.c | 39 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 39 insertions(+)
>
> diff --git a/drivers/media/i2c/ak7375.c b/drivers/media/i2c/ak7375.c
> index 40b1a4aa846c..c2b2542a0056 100644
> --- a/drivers/media/i2c/ak7375.c
> +++ b/drivers/media/i2c/ak7375.c
> @@ -6,6 +6,7 @@
> #include <linux/i2c.h>
> #include <linux/module.h>
> #include <linux/pm_runtime.h>
> +#include <linux/regulator/consumer.h>
> #include <media/v4l2-ctrls.h>
> #include <media/v4l2-device.h>
>
> @@ -23,17 +24,32 @@
> */
> #define AK7375_CTRL_STEPS 64
> #define AK7375_CTRL_DELAY_US 1000
> +/*
> + * The vcm takes around 3 ms to power on and start taking
> + * I2C messages. This value was found experimentally due to
> + * lack of documentation.
> + */
> +#define AK7375_POWER_DELAY_US 3000
>
> #define AK7375_REG_POSITION 0x0
> #define AK7375_REG_CONT 0x2
> #define AK7375_MODE_ACTIVE 0x0
> #define AK7375_MODE_STANDBY 0x40
>
> +static const char * const ak7375_supply_names[] = {
> + "vdd",
> + "vio",
> +};
> +
> +#define AK7375_NUM_SUPPLIES ARRAY_SIZE(ak7375_supply_names)
> +
> /* ak7375 device structure */
> struct ak7375_device {
> struct v4l2_ctrl_handler ctrls_vcm;
> struct v4l2_subdev sd;
> struct v4l2_ctrl *focus;
> + struct regulator_bulk_data supplies[AK7375_NUM_SUPPLIES];
> +
> /* active or standby mode */
> bool active;
> };
> @@ -133,12 +149,24 @@ static int ak7375_probe(struct i2c_client *client)
> {
> struct ak7375_device *ak7375_dev;
> int ret;
> + int i;
>
> ak7375_dev = devm_kzalloc(&client->dev, sizeof(*ak7375_dev),
> GFP_KERNEL);
> if (!ak7375_dev)
> return -ENOMEM;
>
> + for (i = 0; i < AK7375_NUM_SUPPLIES; i++)
> + ak7375_dev->supplies[i].supply = ak7375_supply_names[i];
> +
> + ret = devm_regulator_bulk_get(&client->dev, AK7375_NUM_SUPPLIES,
> + ak7375_dev->supplies);
> + if (ret) {
> + dev_err(&client->dev, "Failed to get regulators: %pe",
> + ERR_PTR(ret));
Why are you using %pe here ? Your return value is not a pointer
(Also, missing \n at the end of the string)
>From Documentation/core-api/printk-formats.rst:
%pe -ENOSPC
For printing error pointers (i.e. a pointer for which IS_ERR() is true)
as a symbolic error name. Error values for which no symbolic name is
known are printed in decimal, while a non-ERR_PTR passed as the
argument to %pe gets treated as ordinary %p.
> + return ret;
> + }
> +
> v4l2_i2c_subdev_init(&ak7375_dev->sd, client, &ak7375_ops);
> ak7375_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> ak7375_dev->sd.internal_ops = &ak7375_int_ops;
> @@ -210,6 +238,10 @@ static int __maybe_unused ak7375_vcm_suspend(struct device *dev)
> if (ret)
> dev_err(dev, "%s I2C failure: %d\n", __func__, ret);
>
> + ret = regulator_bulk_disable(AK7375_NUM_SUPPLIES, ak7375_dev->supplies);
> + if (ret)
> + return ret;
> +
> ak7375_dev->active = false;
>
> return 0;
> @@ -230,6 +262,13 @@ static int __maybe_unused ak7375_vcm_resume(struct device *dev)
> if (ak7375_dev->active)
> return 0;
>
> + ret = regulator_bulk_enable(AK7375_NUM_SUPPLIES, ak7375_dev->supplies);
> + if (ret)
> + return ret;
> +
> + /* Wait for vcm to become ready */
> + usleep_range(AK7375_POWER_DELAY_US, AK7375_POWER_DELAY_US + 500);
> +
> ret = ak7375_i2c_write(ak7375_dev, AK7375_REG_CONT,
> AK7375_MODE_ACTIVE, 1);
> if (ret) {
> --
> 2.37.0
>
