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[media] v4l2: add new VIDIOC_DBG_G_CHIP_NAME ioctl

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Simplify the debugging ioctls by creating the VIDIOC_DBG_G_CHIP_NAME ioctl.
This will eventually replace VIDIOC_DBG_G_CHIP_IDENT. Chip matching is done
by the name or index of subdevices or an index to a bridge chip. Most of this
can all be done automatically, so most drivers just need to provide get/set
register ops.
In particular, it is now possible to get/set subdev registers without
requiring assistance of the bridge driver.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil
2013-03-18 12:16:34 -03:00
committed by Mauro Carvalho Chehab
parent 820eac0ef8
commit 79b0c64005
5 changed files with 146 additions and 16 deletions
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34
include/uapi/linux/videodev2.h
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@@ -1807,10 +1807,13 @@ struct v4l2_event_subscription {
/* VIDIOC_DBG_G_REGISTER and VIDIOC_DBG_S_REGISTER */
#define V4L2_CHIP_MATCH_HOST 0 /* Match against chip ID on host (0 for the host) */
#define V4L2_CHIP_MATCH_I2C_DRIVER 1 /* Match against I2C driver name */
#define V4L2_CHIP_MATCH_I2C_ADDR 2 /* Match against I2C 7-bit address */
#define V4L2_CHIP_MATCH_AC97 3 /* Match against anciliary AC97 chip */
#define V4L2_CHIP_MATCH_BRIDGE 0 /* Match against chip ID on the bridge (0 for the bridge) */
#define V4L2_CHIP_MATCH_HOST V4L2_CHIP_MATCH_BRIDGE
#define V4L2_CHIP_MATCH_I2C_DRIVER 1 /* Match against I2C driver name */
#define V4L2_CHIP_MATCH_I2C_ADDR 2 /* Match against I2C 7-bit address */
#define V4L2_CHIP_MATCH_AC97 3 /* Match against anciliary AC97 chip */
#define V4L2_CHIP_MATCH_SUBDEV_NAME 4 /* Match against subdev name */
#define V4L2_CHIP_MATCH_SUBDEV_IDX 5 /* Match against subdev index */
struct v4l2_dbg_match {
__u32 type; /* Match type */
@@ -1834,6 +1837,17 @@ struct v4l2_dbg_chip_ident {
__u32 revision; /* chip revision, chip specific */
} __attribute__ ((packed));
#define V4L2_CHIP_FL_READABLE (1 << 0)
#define V4L2_CHIP_FL_WRITABLE (1 << 1)
/* VIDIOC_DBG_G_CHIP_NAME */
struct v4l2_dbg_chip_name {
struct v4l2_dbg_match match;
char name[32];
__u32 flags;
__u32 reserved[8];
} __attribute__ ((packed));
/**
* struct v4l2_create_buffers - VIDIOC_CREATE_BUFS argument
* @index: on return, index of the first created buffer
@@ -1911,15 +1925,12 @@ struct v4l2_create_buffers {
#define VIDIOC_G_EXT_CTRLS _IOWR('V', 71, struct v4l2_ext_controls)
#define VIDIOC_S_EXT_CTRLS _IOWR('V', 72, struct v4l2_ext_controls)
#define VIDIOC_TRY_EXT_CTRLS _IOWR('V', 73, struct v4l2_ext_controls)
#if 1
#define VIDIOC_ENUM_FRAMESIZES _IOWR('V', 74, struct v4l2_frmsizeenum)
#define VIDIOC_ENUM_FRAMEINTERVALS _IOWR('V', 75, struct v4l2_frmivalenum)
#define VIDIOC_G_ENC_INDEX _IOR('V', 76, struct v4l2_enc_idx)
#define VIDIOC_ENCODER_CMD _IOWR('V', 77, struct v4l2_encoder_cmd)
#define VIDIOC_TRY_ENCODER_CMD _IOWR('V', 78, struct v4l2_encoder_cmd)
#endif
#if 1
/* Experimental, meant for debugging, testing and internal use.
Only implemented if CONFIG_VIDEO_ADV_DEBUG is defined.
You must be root to use these ioctls. Never use these in applications! */
@@ -1927,9 +1938,10 @@ struct v4l2_create_buffers {
#define VIDIOC_DBG_G_REGISTER _IOWR('V', 80, struct v4l2_dbg_register)
/* Experimental, meant for debugging, testing and internal use.
Never use this ioctl in applications! */
Never use this ioctl in applications!
Note: this ioctl is deprecated in favor of VIDIOC_DBG_G_CHIP_NAME and
will go away in the future. */
#define VIDIOC_DBG_G_CHIP_IDENT _IOWR('V', 81, struct v4l2_dbg_chip_ident)
#endif
#define VIDIOC_S_HW_FREQ_SEEK _IOW('V', 82, struct v4l2_hw_freq_seek)
@@ -1963,6 +1975,10 @@ struct v4l2_create_buffers {
versions. */
#define VIDIOC_ENUM_FREQ_BANDS _IOWR('V', 101, struct v4l2_frequency_band)
/* Experimental, meant for debugging, testing and internal use.
Never use these in applications! */
#define VIDIOC_DBG_G_CHIP_NAME _IOWR('V', 102, struct v4l2_dbg_chip_name)
/* Reminder: when adding new ioctls please add support for them to
drivers/media/video/v4l2-compat-ioctl32.c as well! */