From: Ricardo Ribalda Delgado <ribalda@kernel.org>
To: Pavel Machek <pavel@ucw.cz>, Sakari Ailus <sakari.ailus@iki.fi>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
linux-media@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Ricardo Ribalda Delgado <ribalda@kernel.org>
Subject: [PATCH v7 3/6] ad5820: Add support for enable pin
Date: Mon, 7 Oct 2019 15:20:43 +0200 [thread overview]
Message-ID: <20191007132050.27298-6-ribalda@kernel.org> (raw)
In-Reply-To: <20191007132050.27298-1-ribalda@kernel.org>
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>
---
drivers/media/i2c/Kconfig | 2 +-
drivers/media/i2c/ad5820.c | 17 +++++++++++++++++
2 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 78dc64d7b0e7..30d460844dff 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -975,7 +975,7 @@ if MEDIA_CAMERA_SUPPORT
config VIDEO_AD5820
tristate "AD5820 lens voice coil support"
- depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
+ depends on GPIOLIB && I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
help
This is a driver for the AD5820 camera lens voice coil.
It is used for example in Nokia N900 (RX-51).
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);
--
2.23.0
next prev parent reply other threads:[~2019-10-07 13:21 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-07 13:20 [PATCH v7 0/6] ad5820: Multiple fixes Ricardo Ribalda Delgado
2019-10-07 13:20 ` [PATCH v7 1/6] ad5820: Define entity function Ricardo Ribalda Delgado
2019-10-07 13:20 ` [PATCH v7 1/6] media: " Ricardo Ribalda Delgado
2019-10-07 13:20 ` [PATCH v7 2/6] ad5820: DT new optional field enable-gpios Ricardo Ribalda Delgado
2019-10-07 13:20 ` [PATCH v7 2/6] media: " Ricardo Ribalda Delgado
2019-10-07 13:20 ` Ricardo Ribalda Delgado [this message]
2019-10-07 13:20 ` [PATCH v7 3/6] media: ad5820: Add support for enable pin Ricardo Ribalda Delgado
2019-10-07 13:20 ` [PATCH v7 4/6] ad5820: Add support for of-autoload Ricardo Ribalda Delgado
2019-10-07 13:20 ` [PATCH v7 4/6] media: " Ricardo Ribalda Delgado
2019-10-07 13:20 ` [PATCH v7 5/6] ad5820: DT new compatible devices Ricardo Ribalda Delgado
2019-10-07 13:20 ` [PATCH v7 5/6] media: " Ricardo Ribalda Delgado
2019-10-07 13:20 ` [PATCH v7 6/6] ad5820: Add support for ad5821 and ad5823 Ricardo Ribalda Delgado
2019-10-07 13:20 ` [PATCH v7 6/6] media: " Ricardo Ribalda Delgado
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