Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
media: dw9714: add support for powerdown pin
Add support for the powerdown pin (xSD), which can be used to put the VCM
driver into power down mode. This is useful, for example, if the VCM
driver's power supply cannot be controlled. The use of the powerdown pin is
optional.
Signed-off-by: Matthias Fend <matthias.fend@emfend.at>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
authored by
Matthias Fend
and committed by
Hans Verkuil
03dca184
1eefe42e
+15
-1
+1
-1
drivers/media/i2c/Kconfig
+1
-1
drivers/media/i2c/Kconfig
+14
drivers/media/i2c/dw9714.c
+14
drivers/media/i2c/dw9714.c
···
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2
// Copyright (c) 2015--2017 Intel Corporation.
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/pm_runtime.h>
···
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struct v4l2_subdev sd;
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u16 current_val;
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struct regulator *vcc;
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struct gpio_desc *powerdown_gpio;
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};
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static inline struct dw9714_device *to_dw9714_vcm(struct v4l2_ctrl *ctrl)
···
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if (ret)
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return ret;
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gpiod_set_value_cansleep(dw9714_dev->powerdown_gpio, 0);
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usleep_range(1000, 2000);
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return 0;
···
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static int dw9714_power_down(struct dw9714_device *dw9714_dev)
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{
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gpiod_set_value_cansleep(dw9714_dev->powerdown_gpio, 1);
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return regulator_disable(dw9714_dev->vcc);
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}
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···
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dw9714_dev->vcc = devm_regulator_get(&client->dev, "vcc");
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if (IS_ERR(dw9714_dev->vcc))
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return PTR_ERR(dw9714_dev->vcc);
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dw9714_dev->powerdown_gpio = devm_gpiod_get_optional(&client->dev,
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"powerdown",
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GPIOD_OUT_HIGH);
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if (IS_ERR(dw9714_dev->powerdown_gpio))
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return dev_err_probe(&client->dev,
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PTR_ERR(dw9714_dev->powerdown_gpio),
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"could not get powerdown gpio\n");
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rval = dw9714_power_up(dw9714_dev);
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if (rval)