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media: i2c: ak7375: Add regulator management 

Make the driver get needed regulators on probe and enable/disable
them on runtime PM callbacks.

Signed-off-by: Yassine Oudjana <y.oudjana@protonmail.com>
Tested-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Yassine Oudjana 2022-12-09 15:37:41 +01:00 committed by Mauro Carvalho Chehab
parent 04a79f0783
commit 90f7e76eac
1 changed files with 38 additions and 0 deletions
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38
drivers/media/i2c/ak7375.c
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@ -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 +24,29 @@
*/
#define AK7375_CTRL_STEPS 64
#define AK7375_CTRL_DELAY_US 1000
/*
* The vcm may take up 10 ms (tDELAY) to power on and start taking
* I2C messages. Based on AK7371 datasheet.
*/
#define AK7375_POWER_DELAY_US 10000
#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",
};
/* 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[ARRAY_SIZE(ak7375_supply_names)];
/* active or standby mode */
bool active;
};
@ -133,12 +146,24 @@ static int ak7375_probe(struct i2c_client *client)
{
struct ak7375_device *ak7375_dev;
int ret;
unsigned int i;
ak7375_dev = devm_kzalloc(&client->dev, sizeof(*ak7375_dev),
GFP_KERNEL);
if (!ak7375_dev)
return -ENOMEM;
for (i = 0; i < ARRAY_SIZE(ak7375_supply_names); i++)
ak7375_dev->supplies[i].supply = ak7375_supply_names[i];
ret = devm_regulator_bulk_get(&client->dev,
ARRAY_SIZE(ak7375_supply_names),
ak7375_dev->supplies);
if (ret) {
dev_err_probe(&client->dev, ret, "Failed to get regulators\n");
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;
@ -208,6 +233,11 @@ 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(ARRAY_SIZE(ak7375_supply_names),
ak7375_dev->supplies);
if (ret)
return ret;
ak7375_dev->active = false;
return 0;
@ -228,6 +258,14 @@ static int __maybe_unused ak7375_vcm_resume(struct device *dev)
if (ak7375_dev->active)
return 0;
ret = regulator_bulk_enable(ARRAY_SIZE(ak7375_supply_names),
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) {