diff options
Diffstat (limited to 'Documentation/DocBook/media/v4l/vidioc-dbg-g-register.xml')
| -rw-r--r-- | Documentation/DocBook/media/v4l/vidioc-dbg-g-register.xml | 29 |
1 files changed, 19 insertions, 10 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-dbg-g-register.xml b/Documentation/DocBook/media/v4l/vidioc-dbg-g-register.xml index a44aebc7997a..d13bac9e2445 100644 --- a/Documentation/DocBook/media/v4l/vidioc-dbg-g-register.xml +++ b/Documentation/DocBook/media/v4l/vidioc-dbg-g-register.xml @@ -87,7 +87,7 @@ written into the register.</para> <para>To read a register applications must initialize the <structfield>match.type</structfield>, -<structfield>match.chip</structfield> or <structfield>match.name</structfield> and +<structfield>match.addr</structfield> or <structfield>match.name</structfield> and <structfield>reg</structfield> fields, and call <constant>VIDIOC_DBG_G_REGISTER</constant> with a pointer to this structure. On success the driver stores the register value in the @@ -95,11 +95,11 @@ structure. On success the driver stores the register value in the unchanged.</para> <para>When <structfield>match.type</structfield> is -<constant>V4L2_CHIP_MATCH_HOST</constant>, -<structfield>match.addr</structfield> selects the nth non-&i2c; chip +<constant>V4L2_CHIP_MATCH_BRIDGE</constant>, +<structfield>match.addr</structfield> selects the nth non-sub-device chip on the TV card. The number zero always selects the host chip, ⪚ the chip connected to the PCI or USB bus. You can find out which chips are -present with the &VIDIOC-DBG-G-CHIP-IDENT; ioctl.</para> +present with the &VIDIOC-DBG-G-CHIP-INFO; ioctl.</para> <para>When <structfield>match.type</structfield> is <constant>V4L2_CHIP_MATCH_I2C_DRIVER</constant>, @@ -109,7 +109,7 @@ For instance supported by the saa7127 driver, regardless of its &i2c; bus address. When multiple chips supported by the same driver are present, the effect of these ioctls is undefined. Again with the -&VIDIOC-DBG-G-CHIP-IDENT; ioctl you can find out which &i2c; chips are +&VIDIOC-DBG-G-CHIP-INFO; ioctl you can find out which &i2c; chips are present.</para> <para>When <structfield>match.type</structfield> is @@ -122,19 +122,23 @@ bus address.</para> <structfield>match.addr</structfield> selects the nth AC97 chip on the TV card.</para> + <para>When <structfield>match.type</structfield> is +<constant>V4L2_CHIP_MATCH_SUBDEV</constant>, +<structfield>match.addr</structfield> selects the nth sub-device.</para> + <note> <title>Success not guaranteed</title> <para>Due to a flaw in the Linux &i2c; bus driver these ioctls may return successfully without actually reading or writing a register. To -catch the most likely failure we recommend a &VIDIOC-DBG-G-CHIP-IDENT; +catch the most likely failure we recommend a &VIDIOC-DBG-G-CHIP-INFO; call confirming the presence of the selected &i2c; chip.</para> </note> <para>These ioctls are optional, not all drivers may support them. However when a driver supports these ioctls it must also support -&VIDIOC-DBG-G-CHIP-IDENT;. Conversely it may support -<constant>VIDIOC_DBG_G_CHIP_IDENT</constant> but not these ioctls.</para> +&VIDIOC-DBG-G-CHIP-INFO;. Conversely it may support +<constant>VIDIOC_DBG_G_CHIP_INFO</constant> but not these ioctls.</para> <para><constant>VIDIOC_DBG_G_REGISTER</constant> and <constant>VIDIOC_DBG_S_REGISTER</constant> were introduced in Linux @@ -217,10 +221,10 @@ register.</entry> &cs-def; <tbody valign="top"> <row> - <entry><constant>V4L2_CHIP_MATCH_HOST</constant></entry> + <entry><constant>V4L2_CHIP_MATCH_BRIDGE</constant></entry> <entry>0</entry> <entry>Match the nth chip on the card, zero for the - host chip. Does not match &i2c; chips.</entry> + bridge chip. Does not match sub-devices.</entry> </row> <row> <entry><constant>V4L2_CHIP_MATCH_I2C_DRIVER</constant></entry> @@ -237,6 +241,11 @@ register.</entry> <entry>3</entry> <entry>Match the nth anciliary AC97 chip.</entry> </row> + <row> + <entry><constant>V4L2_CHIP_MATCH_SUBDEV</constant></entry> + <entry>4</entry> + <entry>Match the nth sub-device.</entry> + </row> </tbody> </tgroup> </table> |