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[media] soc_camera: Add the ability to bind regulators to soc_camedra devices

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In certain machines, camera devices are supplied directly
by a number of regulators. This patch add the ability to drive
these regulators directly by the soc_camera driver.

Signed-off-by: Alberto Panizzo <maramaopercheseimorto@gmail.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Alberto Panizzo 2010-12-02 07:43:37 -03:00 committed by Mauro Carvalho Chehab
parent 3153ac9c62
commit 96e442c1b2
2 changed files with 70 additions and 21 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

86
drivers/media/video/soc_camera.c
View file

@ -24,6 +24,7 @@
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/vmalloc.h>
@ -43,6 +44,51 @@ static LIST_HEAD(hosts);
static LIST_HEAD(devices);
static DEFINE_MUTEX(list_lock); /* Protects the list of hosts */
static int soc_camera_power_set(struct soc_camera_device *icd,
struct soc_camera_link *icl,
int power_on)
{
int ret;
if (power_on) {
ret = regulator_bulk_enable(icl->num_regulators,
icl->regulators);
if (ret < 0) {
dev_err(&icd->dev, "Cannot enable regulators\n");
return ret;
}
if (icl->power)
ret = icl->power(icd->pdev, power_on);
if (ret < 0) {
dev_err(&icd->dev,
"Platform failed to power-on the camera.\n");
regulator_bulk_disable(icl->num_regulators,
icl->regulators);
return ret;
}
} else {
ret = 0;
if (icl->power)
ret = icl->power(icd->pdev, 0);
if (ret < 0) {
dev_err(&icd->dev,
"Platform failed to power-off the camera.\n");
return ret;
}
ret = regulator_bulk_disable(icl->num_regulators,
icl->regulators);
if (ret < 0) {
dev_err(&icd->dev, "Cannot disable regulators\n");
return ret;
}
}
return 0;
}
const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
struct soc_camera_device *icd, unsigned int fourcc)
{
@ -369,11 +415,9 @@ static int soc_camera_open(struct file *file)
},
};
if (icl->power) {
ret = icl->power(icd->pdev, 1);
if (ret < 0)
goto epower;
}
ret = soc_camera_power_set(icd, icl, 1);
if (ret < 0)
goto epower;
/* The camera could have been already on, try to reset */
if (icl->reset)
@ -417,8 +461,7 @@ esfmt:
eresume:
ici->ops->remove(icd);
eiciadd:
if (icl->power)
icl->power(icd->pdev, 0);
soc_camera_power_set(icd, icl, 0);
epower:
icd->use_count--;
module_put(ici->ops->owner);
@ -440,8 +483,7 @@ static int soc_camera_close(struct file *file)
ici->ops->remove(icd);
if (icl->power)
icl->power(icd->pdev, 0);
soc_camera_power_set(icd, icl, 0);
}
if (icd->streamer == file)
@ -908,14 +950,14 @@ static int soc_camera_probe(struct device *dev)
dev_info(dev, "Probing %s\n", dev_name(dev));
if (icl->power) {
ret = icl->power(icd->pdev, 1);
if (ret < 0) {
dev_err(dev,
"Platform failed to power-on the camera.\n");
goto epower;
}
}
ret = regulator_bulk_get(icd->pdev, icl->num_regulators,
icl->regulators);
if (ret < 0)
goto ereg;
ret = soc_camera_power_set(icd, icl, 1);
if (ret < 0)
goto epower;
/* The camera could have been already on, try to reset */
if (icl->reset)
@ -994,8 +1036,7 @@ static int soc_camera_probe(struct device *dev)
ici->ops->remove(icd);
if (icl->power)
icl->power(icd->pdev, 0);
soc_camera_power_set(icd, icl, 0);
mutex_unlock(&icd->video_lock);
@ -1017,9 +1058,10 @@ eadddev:
evdc:
ici->ops->remove(icd);
eadd:
if (icl->power)
icl->power(icd->pdev, 0);
soc_camera_power_set(icd, icl, 0);
epower:
regulator_bulk_free(icl->num_regulators, icl->regulators);
ereg:
return ret;
}
@ -1052,6 +1094,8 @@ static int soc_camera_remove(struct device *dev)
}
soc_camera_free_user_formats(icd);
regulator_bulk_free(icl->num_regulators, icl->regulators);
return 0;
}

5
include/media/soc_camera.h
View file

@ -97,6 +97,7 @@ struct soc_camera_host_ops {
#define SOCAM_SENSOR_INVERT_DATA (1 << 4)
struct i2c_board_info;
struct regulator_bulk_data;
struct soc_camera_link {
/* Camera bus id, used to match a camera and a bus */
@ -108,6 +109,10 @@ struct soc_camera_link {
const char *module_name;
void *priv;
/* Optional regulators that have to be managed on power on/off events */
struct regulator_bulk_data *regulators;
int num_regulators;
/*
* For non-I2C devices platform platform has to provide methods to
* add a device to the system and to remove