diff options
Diffstat (limited to 'drivers/media/i2c/dw9714.c')
| -rw-r--r-- | drivers/media/i2c/dw9714.c | 62 |
1 files changed, 45 insertions, 17 deletions
diff --git a/drivers/media/i2c/dw9714.c b/drivers/media/i2c/dw9714.c index 2ddd7daa79e2..1e7ad355a388 100644 --- a/drivers/media/i2c/dw9714.c +++ b/drivers/media/i2c/dw9714.c @@ -2,6 +2,7 @@ // Copyright (c) 2015--2017 Intel Corporation. #include <linux/delay.h> +#include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/module.h> #include <linux/pm_runtime.h> @@ -38,6 +39,7 @@ struct dw9714_device { struct v4l2_subdev sd; u16 current_val; struct regulator *vcc; + struct gpio_desc *powerdown_gpio; }; static inline struct dw9714_device *to_dw9714_vcm(struct v4l2_ctrl *ctrl) @@ -137,6 +139,28 @@ static int dw9714_init_controls(struct dw9714_device *dev_vcm) return hdl->error; } +static int dw9714_power_up(struct dw9714_device *dw9714_dev) +{ + int ret; + + ret = regulator_enable(dw9714_dev->vcc); + if (ret) + return ret; + + gpiod_set_value_cansleep(dw9714_dev->powerdown_gpio, 0); + + usleep_range(1000, 2000); + + return 0; +} + +static int dw9714_power_down(struct dw9714_device *dw9714_dev) +{ + gpiod_set_value_cansleep(dw9714_dev->powerdown_gpio, 1); + + return regulator_disable(dw9714_dev->vcc); +} + static int dw9714_probe(struct i2c_client *client) { struct dw9714_device *dw9714_dev; @@ -144,20 +168,25 @@ static int dw9714_probe(struct i2c_client *client) dw9714_dev = devm_kzalloc(&client->dev, sizeof(*dw9714_dev), GFP_KERNEL); - if (dw9714_dev == NULL) + if (!dw9714_dev) return -ENOMEM; dw9714_dev->vcc = devm_regulator_get(&client->dev, "vcc"); if (IS_ERR(dw9714_dev->vcc)) return PTR_ERR(dw9714_dev->vcc); - rval = regulator_enable(dw9714_dev->vcc); - if (rval < 0) { - dev_err(&client->dev, "failed to enable vcc: %d\n", rval); - return rval; - } + dw9714_dev->powerdown_gpio = devm_gpiod_get_optional(&client->dev, + "powerdown", + GPIOD_OUT_HIGH); + if (IS_ERR(dw9714_dev->powerdown_gpio)) + return dev_err_probe(&client->dev, + PTR_ERR(dw9714_dev->powerdown_gpio), + "could not get powerdown gpio\n"); - usleep_range(1000, 2000); + rval = dw9714_power_up(dw9714_dev); + if (rval) + return dev_err_probe(&client->dev, rval, + "failed to power up: %d\n", rval); v4l2_i2c_subdev_init(&dw9714_dev->sd, client, &dw9714_ops); dw9714_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | @@ -185,7 +214,7 @@ static int dw9714_probe(struct i2c_client *client) return 0; err_cleanup: - regulator_disable(dw9714_dev->vcc); + dw9714_power_down(dw9714_dev); v4l2_ctrl_handler_free(&dw9714_dev->ctrls_vcm); media_entity_cleanup(&dw9714_dev->sd.entity); @@ -200,10 +229,10 @@ static void dw9714_remove(struct i2c_client *client) pm_runtime_disable(&client->dev); if (!pm_runtime_status_suspended(&client->dev)) { - ret = regulator_disable(dw9714_dev->vcc); + ret = dw9714_power_down(dw9714_dev); if (ret) { dev_err(&client->dev, - "Failed to disable vcc: %d\n", ret); + "Failed to power down: %d\n", ret); } } pm_runtime_set_suspended(&client->dev); @@ -234,9 +263,9 @@ static int __maybe_unused dw9714_vcm_suspend(struct device *dev) usleep_range(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10); } - ret = regulator_disable(dw9714_dev->vcc); + ret = dw9714_power_down(dw9714_dev); if (ret) - dev_err(dev, "Failed to disable vcc: %d\n", ret); + dev_err(dev, "Failed to power down: %d\n", ret); return ret; } @@ -247,7 +276,7 @@ static int __maybe_unused dw9714_vcm_suspend(struct device *dev) * The lens position is gradually moved in units of DW9714_CTRL_STEPS, * to make the movements smoothly. */ -static int __maybe_unused dw9714_vcm_resume(struct device *dev) +static int __maybe_unused dw9714_vcm_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct v4l2_subdev *sd = i2c_get_clientdata(client); @@ -257,12 +286,11 @@ static int __maybe_unused dw9714_vcm_resume(struct device *dev) if (pm_runtime_suspended(&client->dev)) return 0; - ret = regulator_enable(dw9714_dev->vcc); + ret = dw9714_power_up(dw9714_dev); if (ret) { - dev_err(dev, "Failed to enable vcc: %d\n", ret); + dev_err(dev, "Failed to power up: %d\n", ret); return ret; } - usleep_range(1000, 2000); for (val = dw9714_dev->current_val % DW9714_CTRL_STEPS; val < dw9714_dev->current_val + DW9714_CTRL_STEPS - 1; @@ -271,7 +299,7 @@ static int __maybe_unused dw9714_vcm_resume(struct device *dev) DW9714_VAL(val, DW9714_DEFAULT_S)); if (ret) dev_err_ratelimited(dev, "%s I2C failure: %d", - __func__, ret); + __func__, ret); usleep_range(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10); } |