diff options
Diffstat (limited to 'drivers/media/i2c/ak7375.c')
| -rw-r--r-- | drivers/media/i2c/ak7375.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/media/i2c/ak7375.c b/drivers/media/i2c/ak7375.c index 1af9f698eecf..e7cec45bc271 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 +24,29 @@ */ #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) { |