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[media] V4L: soc_camera_platform: add helper functions to manage device instances 

Add helper inline functions to correctly manage dynamic allocation and
freeing of platform devices. This avoids the ugly code to nullify
device objects.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Guennadi Liakhovetski 2011-03-23 04:14:43 -03:00 committed by Mauro Carvalho Chehab
parent e0df5417ac
commit ec0c8d555a
1 changed files with 50 additions and 0 deletions
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50
include/media/soc_camera_platform.h
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@ -25,4 +25,54 @@ struct soc_camera_platform_info {
int (*set_capture)(struct soc_camera_platform_info *info, int enable);
};
static inline void soc_camera_platform_release(struct platform_device **pdev)
{
*pdev = NULL;
}
static inline int soc_camera_platform_add(const struct soc_camera_link *icl,
struct device *dev,
struct platform_device **pdev,
struct soc_camera_link *plink,
void (*release)(struct device *dev),
int id)
{
struct soc_camera_platform_info *info = plink->priv;
int ret;
if (icl != plink)
return -ENODEV;
if (*pdev)
return -EBUSY;
*pdev = platform_device_alloc("soc_camera_platform", id);
if (!*pdev)
return -ENOMEM;
info->dev = dev;
(*pdev)->dev.platform_data = info;
(*pdev)->dev.release = release;
ret = platform_device_add(*pdev);
if (ret < 0) {
platform_device_put(*pdev);
*pdev = NULL;
info->dev = NULL;
}
return ret;
}
static inline void soc_camera_platform_del(const struct soc_camera_link *icl,
struct platform_device *pdev,
const struct soc_camera_link *plink)
{
if (icl != plink || !pdev)
return;
platform_device_unregister(pdev);
}
#endif /* __SOC_CAMERA_H__ */