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| author | Ricardo Ribalda Delgado <ribalda@kernel.org> | 2019-10-07 15:28:53 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-10-24 23:43:50 +0200 |
| commit | c01674e75a4193d1e23f509689e676634f067a0b (patch) | |
| tree | 646a455e7e1811c4a72f2b27435cdc066eb5bb91 /drivers/media/i2c/ad5820.c | |
| parent | media: ad5820: DT new optional field enable-gpios (diff) | |
| download | linux-c01674e75a4193d1e23f509689e676634f067a0b.tar.xz linux-c01674e75a4193d1e23f509689e676634f067a0b.zip | |
media: ad5820: Add support for enable pin
This patch adds support for a programmable enable pin. It can be used in
situations where the ANA-vcc is not configurable (dummy-regulator), or
just to have a more fine control of the power saving.
The use of the enable pin is optional.
Signed-off-by: Ricardo Ribalda Delgado <ribalda@kernel.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'drivers/media/i2c/ad5820.c')
| -rw-r--r-- | drivers/media/i2c/ad5820.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/media/i2c/ad5820.c b/drivers/media/i2c/ad5820.c index 7a49651f4d1f..76aab651f217 100644 --- a/drivers/media/i2c/ad5820.c +++ b/drivers/media/i2c/ad5820.c @@ -19,6 +19,7 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/regulator/consumer.h> +#include <linux/gpio/consumer.h> #include <media/v4l2-ctrls.h> #include <media/v4l2-device.h> @@ -47,6 +48,8 @@ struct ad5820_device { u32 focus_ramp_time; u32 focus_ramp_mode; + struct gpio_desc *enable_gpio; + struct mutex power_lock; int power_count; @@ -114,6 +117,8 @@ static int ad5820_power_off(struct ad5820_device *coil, bool standby) ret = ad5820_update_hw(coil); } + gpiod_set_value_cansleep(coil->enable_gpio, 0); + ret2 = regulator_disable(coil->vana); if (ret) return ret; @@ -128,6 +133,8 @@ static int ad5820_power_on(struct ad5820_device *coil, bool restore) if (ret < 0) return ret; + gpiod_set_value_cansleep(coil->enable_gpio, 1); + if (restore) { /* Restore the hardware settings. */ coil->standby = false; @@ -138,6 +145,7 @@ static int ad5820_power_on(struct ad5820_device *coil, bool restore) return 0; fail: + gpiod_set_value_cansleep(coil->enable_gpio, 0); coil->standby = true; regulator_disable(coil->vana); @@ -304,6 +312,15 @@ static int ad5820_probe(struct i2c_client *client, return ret; } + coil->enable_gpio = devm_gpiod_get_optional(&client->dev, "enable", + GPIOD_OUT_LOW); + if (IS_ERR(coil->enable_gpio)) { + ret = PTR_ERR(coil->enable_gpio); + if (ret != -EPROBE_DEFER) + dev_err(&client->dev, "could not get enable gpio\n"); + return ret; + } + mutex_init(&coil->power_lock); v4l2_i2c_subdev_init(&coil->subdev, client, &ad5820_ops); |