| Message ID | 1417186251-6542-3-git-send-email-hverkuil@xs4all.nl (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Nov 28, 2014 at 03:50:50PM +0100, Hans Verkuil wrote: > From: Martin Bugge <marbugge@cisco.com> > > When receiving video it is very useful to be able to unpack the InfoFrames. > Logging is useful as well, both for transmitters and receivers. > > Especially when implementing the VIDIOC_LOG_STATUS ioctl (supported by many > V4L2 drivers) for a receiver it is important to be able to easily log what > the InfoFrame contains. This greatly simplifies debugging. > > Signed-off-by: Martin Bugge <marbugge@cisco.com> > Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> > --- > drivers/video/hdmi.c | 622 ++++++++++++++++++++++++++++++++++++++++++++++++++- > include/linux/hdmi.h | 3 + > 2 files changed, 618 insertions(+), 7 deletions(-) > > diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c > index 9e758a8..9f0f554 100644 > --- a/drivers/video/hdmi.c > +++ b/drivers/video/hdmi.c > @@ -27,10 +27,10 @@ > #include <linux/export.h> > #include <linux/hdmi.h> > #include <linux/string.h> > +#include <linux/device.h> > > -static void hdmi_infoframe_checksum(void *buffer, size_t size) > +static u8 hdmi_infoframe_calc_checksum(u8 *ptr, size_t size) I'd personally keep the name here. > @@ -434,3 +441,604 @@ hdmi_infoframe_pack(union hdmi_infoframe *frame, void *buffer, size_t size) > return length; > } > EXPORT_SYMBOL(hdmi_infoframe_pack); > + > +static const char *hdmi_infoframe_type_txt(enum hdmi_infoframe_type type) Perhaps: hdmi_infoframe_type_get_name()? > +{ > + switch (type) { > + case HDMI_INFOFRAME_TYPE_VENDOR: return "Vendor"; > + case HDMI_INFOFRAME_TYPE_AVI: return "Auxiliary Video Information (AVI)"; > + case HDMI_INFOFRAME_TYPE_SPD: return "Source Product Description (SPD)"; > + case HDMI_INFOFRAME_TYPE_AUDIO: return "Audio"; I'd prefer "case ...:" and "return ...;" on separate lines for readability. > + } > + return "Invalid/Unknown"; > +} Maybe include the numerical value here? Of course that either means that callers must pass in a buffer or we sacrifice thread-safety. The buffer could be optional, somewhat like this: const char *hdmi_infoframe_get_name(char *buffer, size_t length, enum hdmi_infoframe_type type) { const char *name = NULL; switch (type) { case HDMI_INFOFRAME_TYPE_VENDOR: name = "Vendor"; break; ... } if (buffer) { if (!name) snprintf(buffer, length, "unknown (%d)", type); else snprintf(buffer, length, name); name = buffer; } return name; } That way the function would be generally useful and could even be made publicly available. > +static void hdmi_infoframe_log_header(struct device *dev, void *f) > +{ > + struct hdmi_any_infoframe *frame = f; > + dev_info(dev, "HDMI infoframe: %s, version %d, length %d\n", > + hdmi_infoframe_type_txt(frame->type), frame->version, frame->length); > +} > + > +static const char *hdmi_colorspace_txt(enum hdmi_colorspace colorspace) > +{ > + switch (colorspace) { > + case HDMI_COLORSPACE_RGB: return "RGB"; > + case HDMI_COLORSPACE_YUV422: return "YCbCr 4:2:2"; > + case HDMI_COLORSPACE_YUV444: return "YCbCr 4:4:4"; > + case HDMI_COLORSPACE_YUV420: return "YCbCr 4:2:0"; > + case HDMI_COLORSPACE_IDO_DEFINED: return "IDO Defined"; > + } > + return "Future"; > +} Similar comments as for the above. > +static const char *hdmi_scan_mode_txt(enum hdmi_scan_mode scan_mode) > +{ > + switch(scan_mode) { > + case HDMI_SCAN_MODE_NONE: return "No Data"; > + case HDMI_SCAN_MODE_OVERSCAN: return "Composed for overscanned display"; > + case HDMI_SCAN_MODE_UNDERSCAN: return "Composed for underscanned display"; > + } > + return "Future"; > +} This isn't really a name any more, I think it should either stick to names like "None", "Overscan", "Underscan" or it should return a description, in which case hdmi_scan_mode_get_description() might be more accurate for a name. > +static const char *hdmi_colorimetry_txt(enum hdmi_colorimetry colorimetry) > +{ > + switch(colorimetry) { > + case HDMI_COLORIMETRY_NONE: return "No Data"; > + case HDMI_COLORIMETRY_ITU_601: return "ITU601"; > + case HDMI_COLORIMETRY_ITU_709: return "ITU709"; > + case HDMI_COLORIMETRY_EXTENDED: return "Extended"; > + } > + return "Invalid/Unknown"; > +} These are names again, so same comments as for the infoframe type. And perhaps "No Data" -> "None" in that case. > + > +static const char *hdmi_picture_aspect_txt(enum hdmi_picture_aspect picture_aspect) > +{ > + switch (picture_aspect) { > + case HDMI_PICTURE_ASPECT_NONE: return "No Data"; > + case HDMI_PICTURE_ASPECT_4_3: return "4:3"; > + case HDMI_PICTURE_ASPECT_16_9: return "16:9"; > + } > + return "Future"; > +} Same here. > +static const char *hdmi_quantization_range_txt(enum hdmi_quantization_range quantization_range) > +{ > + switch (quantization_range) { > + case HDMI_QUANTIZATION_RANGE_DEFAULT: return "Default (depends on video format)"; I think "Default" would do here ("depends on video format" can be derived from the reading of the specification). Generally I think these should focus on providing a human-readable version of the infoframes, not be a replacement for reading the specification. > +/** > + * hdmi_avi_infoframe_log() - log info of HDMI AVI infoframe > + * @dev: device > + * @frame: HDMI AVI infoframe > + */ > +static void hdmi_avi_infoframe_log(struct device *dev, struct hdmi_avi_infoframe *frame) Perhaps allow this to take a log level? I can imagine drivers wanting to use this with dev_dbg() instead. > +/** > + * hdmi_vendor_infoframe_log() - log info of HDMI VENDOR infoframe > + * @dev: device > + * @frame: HDMI VENDOR infoframe > + */ > +static void hdmi_vendor_any_infoframe_log(struct device *dev, union hdmi_vendor_any_infoframe *frame) > +{ > + struct hdmi_vendor_infoframe *hvf = &frame->hdmi; > + > + hdmi_infoframe_log_header(dev, frame); > + > + if (frame->any.oui != HDMI_IEEE_OUI) { > + dev_info(dev, " not a HDMI vendor infoframe\n"); > + return; > + } > + if (hvf->vic == 0 && hvf->s3d_struct == HDMI_3D_STRUCTURE_INVALID) { > + dev_info(dev, " empty frame\n"); > + return; > + } > + > + if (hvf->vic) { > + dev_info(dev, " Hdmi Vic: %d\n", hvf->vic); "HDMI VIC"? > + } No need for these braces. > +/** > + * hdmi_infoframe_log() - log info of HDMI infoframe > + * @dev: device > + * @frame: HDMI infoframe > + */ > +void hdmi_infoframe_log(struct device *dev, union hdmi_infoframe *frame) > +{ > + switch (frame->any.type) { > + case HDMI_INFOFRAME_TYPE_AVI: > + hdmi_avi_infoframe_log(dev, &frame->avi); > + break; > + case HDMI_INFOFRAME_TYPE_SPD: > + hdmi_spd_infoframe_log(dev, &frame->spd); > + break; > + case HDMI_INFOFRAME_TYPE_AUDIO: > + hdmi_audio_infoframe_log(dev, &frame->audio); > + break; > + case HDMI_INFOFRAME_TYPE_VENDOR: > + hdmi_vendor_any_infoframe_log(dev, &frame->vendor); > + break; > + default: > + WARN(1, "Bad infoframe type %d\n", frame->any.type); Does it make sense for this to be WARN? It's perfectly legal for future devices to expose new types of infoframes. Perhaps even expected. But if we want to keep this here to help get bug reports so that we don't forget to update this code, then maybe we should do the same wherever we query the name of enum values above. > +/** > + * hdmi_avi_infoframe_unpack() - unpack binary buffer to a HDMI AVI infoframe > + * @buffer: source buffer > + * @frame: HDMI AVI infoframe > + * > + * Unpacks the information contained in binary @buffer into a structured > + * @frame of the HDMI Auxiliary Video (AVI) information frame. > + * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4 specification. > + * > + * Returns 0 on success or a negative error code on failure. > + */ > +static int hdmi_avi_infoframe_unpack(void *buffer, struct hdmi_avi_infoframe *frame) I'm on the fence about ordering of arguments here. I think I'd slightly prefer the infoframe to be the first, to make the API more object- oriented. > +{ > + u8 *ptr = buffer; > + int ret; > + > + if (ptr[0] != HDMI_INFOFRAME_TYPE_AVI || > + ptr[1] != 2 || > + ptr[2] != HDMI_AVI_INFOFRAME_SIZE) { > + return -EINVAL; > + } No need for the braces. Thierry
Hi Thierry, Thanks for the review, see my comments below. On 12/01/2014 02:15 PM, Thierry Reding wrote: > On Fri, Nov 28, 2014 at 03:50:50PM +0100, Hans Verkuil wrote: >> From: Martin Bugge <marbugge@cisco.com> >> >> When receiving video it is very useful to be able to unpack the InfoFrames. >> Logging is useful as well, both for transmitters and receivers. >> >> Especially when implementing the VIDIOC_LOG_STATUS ioctl (supported by many >> V4L2 drivers) for a receiver it is important to be able to easily log what >> the InfoFrame contains. This greatly simplifies debugging. >> >> Signed-off-by: Martin Bugge <marbugge@cisco.com> >> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> >> --- >> drivers/video/hdmi.c | 622 ++++++++++++++++++++++++++++++++++++++++++++++++++- >> include/linux/hdmi.h | 3 + >> 2 files changed, 618 insertions(+), 7 deletions(-) >> >> diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c >> index 9e758a8..9f0f554 100644 >> --- a/drivers/video/hdmi.c >> +++ b/drivers/video/hdmi.c >> @@ -27,10 +27,10 @@ >> #include <linux/export.h> >> #include <linux/hdmi.h> >> #include <linux/string.h> >> +#include <linux/device.h> >> >> -static void hdmi_infoframe_checksum(void *buffer, size_t size) >> +static u8 hdmi_infoframe_calc_checksum(u8 *ptr, size_t size) > > I'd personally keep the name here. I'll do that. > >> @@ -434,3 +441,604 @@ hdmi_infoframe_pack(union hdmi_infoframe *frame, void *buffer, size_t size) >> return length; >> } >> EXPORT_SYMBOL(hdmi_infoframe_pack); >> + >> +static const char *hdmi_infoframe_type_txt(enum hdmi_infoframe_type type) > > Perhaps: hdmi_infoframe_type_get_name()? I think that's better as well, I'll change it. > >> +{ >> + switch (type) { >> + case HDMI_INFOFRAME_TYPE_VENDOR: return "Vendor"; >> + case HDMI_INFOFRAME_TYPE_AVI: return "Auxiliary Video Information (AVI)"; >> + case HDMI_INFOFRAME_TYPE_SPD: return "Source Product Description (SPD)"; >> + case HDMI_INFOFRAME_TYPE_AUDIO: return "Audio"; > > I'd prefer "case ...:" and "return ...;" on separate lines for > readability. I actually think that makes it *less* readable. If you really want that, then I'll change it, but I would suggest that you try it yourself first to see if it is really more readable for you. It isn't for me, so I'll keep this for the next version. > >> + } >> + return "Invalid/Unknown"; >> +} > > Maybe include the numerical value here? Of course that either means that > callers must pass in a buffer or we sacrifice thread-safety. The buffer > could be optional, somewhat like this: > > const char *hdmi_infoframe_get_name(char *buffer, size_t length, > enum hdmi_infoframe_type type) > { > const char *name = NULL; > > switch (type) { > case HDMI_INFOFRAME_TYPE_VENDOR: > name = "Vendor"; > break; > ... > } > > if (buffer) { > if (!name) > snprintf(buffer, length, "unknown (%d)", type); > else > snprintf(buffer, length, name); > > name = buffer; > } > > return name; > } > > That way the function would be generally useful and could even be made > publicly available. I would do this only where it makes sense. Some of these fields have only one or two reserved bits left, and in that case is it easier to just say something like "Reserved (3)" and do that for each reserved value. > >> +static void hdmi_infoframe_log_header(struct device *dev, void *f) >> +{ >> + struct hdmi_any_infoframe *frame = f; >> + dev_info(dev, "HDMI infoframe: %s, version %d, length %d\n", >> + hdmi_infoframe_type_txt(frame->type), frame->version, frame->length); >> +} >> + >> +static const char *hdmi_colorspace_txt(enum hdmi_colorspace colorspace) >> +{ >> + switch (colorspace) { >> + case HDMI_COLORSPACE_RGB: return "RGB"; >> + case HDMI_COLORSPACE_YUV422: return "YCbCr 4:2:2"; >> + case HDMI_COLORSPACE_YUV444: return "YCbCr 4:4:4"; >> + case HDMI_COLORSPACE_YUV420: return "YCbCr 4:2:0"; >> + case HDMI_COLORSPACE_IDO_DEFINED: return "IDO Defined"; >> + } >> + return "Future"; >> +} > > Similar comments as for the above. > >> +static const char *hdmi_scan_mode_txt(enum hdmi_scan_mode scan_mode) >> +{ >> + switch(scan_mode) { >> + case HDMI_SCAN_MODE_NONE: return "No Data"; >> + case HDMI_SCAN_MODE_OVERSCAN: return "Composed for overscanned display"; >> + case HDMI_SCAN_MODE_UNDERSCAN: return "Composed for underscanned display"; >> + } >> + return "Future"; >> +} > > This isn't really a name any more, I think it should either stick to > names like "None", "Overscan", "Underscan" I agree with that, I'll change it. > or it should return a > description, in which case hdmi_scan_mode_get_description() might be > more accurate for a name. > >> +static const char *hdmi_colorimetry_txt(enum hdmi_colorimetry colorimetry) >> +{ >> + switch(colorimetry) { >> + case HDMI_COLORIMETRY_NONE: return "No Data"; >> + case HDMI_COLORIMETRY_ITU_601: return "ITU601"; >> + case HDMI_COLORIMETRY_ITU_709: return "ITU709"; >> + case HDMI_COLORIMETRY_EXTENDED: return "Extended"; >> + } >> + return "Invalid/Unknown"; >> +} > > These are names again, so same comments as for the infoframe type. And > perhaps "No Data" -> "None" in that case. Yep. > >> + >> +static const char *hdmi_picture_aspect_txt(enum hdmi_picture_aspect picture_aspect) >> +{ >> + switch (picture_aspect) { >> + case HDMI_PICTURE_ASPECT_NONE: return "No Data"; >> + case HDMI_PICTURE_ASPECT_4_3: return "4:3"; >> + case HDMI_PICTURE_ASPECT_16_9: return "16:9"; >> + } >> + return "Future"; >> +} > > Same here. > >> +static const char *hdmi_quantization_range_txt(enum hdmi_quantization_range quantization_range) >> +{ >> + switch (quantization_range) { >> + case HDMI_QUANTIZATION_RANGE_DEFAULT: return "Default (depends on video format)"; > > I think "Default" would do here ("depends on video format" can be > derived from the reading of the specification). Generally I think these > should focus on providing a human-readable version of the infoframes, > not be a replacement for reading the specification. Indeed. > >> +/** >> + * hdmi_avi_infoframe_log() - log info of HDMI AVI infoframe >> + * @dev: device >> + * @frame: HDMI AVI infoframe >> + */ >> +static void hdmi_avi_infoframe_log(struct device *dev, struct hdmi_avi_infoframe *frame) > > Perhaps allow this to take a log level? I can imagine drivers wanting to > use this with dev_dbg() instead. Makes sense. > >> +/** >> + * hdmi_vendor_infoframe_log() - log info of HDMI VENDOR infoframe >> + * @dev: device >> + * @frame: HDMI VENDOR infoframe >> + */ >> +static void hdmi_vendor_any_infoframe_log(struct device *dev, union hdmi_vendor_any_infoframe *frame) >> +{ >> + struct hdmi_vendor_infoframe *hvf = &frame->hdmi; >> + >> + hdmi_infoframe_log_header(dev, frame); >> + >> + if (frame->any.oui != HDMI_IEEE_OUI) { >> + dev_info(dev, " not a HDMI vendor infoframe\n"); >> + return; >> + } >> + if (hvf->vic == 0 && hvf->s3d_struct == HDMI_3D_STRUCTURE_INVALID) { >> + dev_info(dev, " empty frame\n"); >> + return; >> + } >> + >> + if (hvf->vic) { >> + dev_info(dev, " Hdmi Vic: %d\n", hvf->vic); > > "HDMI VIC"? Will change. > >> + } > > No need for these braces. Will change. > >> +/** >> + * hdmi_infoframe_log() - log info of HDMI infoframe >> + * @dev: device >> + * @frame: HDMI infoframe >> + */ >> +void hdmi_infoframe_log(struct device *dev, union hdmi_infoframe *frame) >> +{ >> + switch (frame->any.type) { >> + case HDMI_INFOFRAME_TYPE_AVI: >> + hdmi_avi_infoframe_log(dev, &frame->avi); >> + break; >> + case HDMI_INFOFRAME_TYPE_SPD: >> + hdmi_spd_infoframe_log(dev, &frame->spd); >> + break; >> + case HDMI_INFOFRAME_TYPE_AUDIO: >> + hdmi_audio_infoframe_log(dev, &frame->audio); >> + break; >> + case HDMI_INFOFRAME_TYPE_VENDOR: >> + hdmi_vendor_any_infoframe_log(dev, &frame->vendor); >> + break; >> + default: >> + WARN(1, "Bad infoframe type %d\n", frame->any.type); > > Does it make sense for this to be WARN? It's perfectly legal for future > devices to expose new types of infoframes. Perhaps even expected. But if > we want to keep this here to help get bug reports so that we don't > forget to update this code, then maybe we should do the same wherever we > query the name of enum values above. I'll drop the WARN from the log function. I think it should also be dropped from the unpack. The only place it makes sense is for pack() since there the data comes from the driver, not from an external source. > >> +/** >> + * hdmi_avi_infoframe_unpack() - unpack binary buffer to a HDMI AVI infoframe >> + * @buffer: source buffer >> + * @frame: HDMI AVI infoframe >> + * >> + * Unpacks the information contained in binary @buffer into a structured >> + * @frame of the HDMI Auxiliary Video (AVI) information frame. >> + * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4 specification. >> + * >> + * Returns 0 on success or a negative error code on failure. >> + */ >> +static int hdmi_avi_infoframe_unpack(void *buffer, struct hdmi_avi_infoframe *frame) > > I'm on the fence about ordering of arguments here. I think I'd slightly > prefer the infoframe to be the first, to make the API more object- > oriented. I'll swap this. It's more consistent with pack() anyway. > >> +{ >> + u8 *ptr = buffer; >> + int ret; >> + >> + if (ptr[0] != HDMI_INFOFRAME_TYPE_AVI || >> + ptr[1] != 2 || >> + ptr[2] != HDMI_AVI_INFOFRAME_SIZE) { >> + return -EINVAL; >> + } > > No need for the braces. Will change. > > Thierry > Regards, Hans
On Mon, Dec 01, 2014 at 02:48:47PM +0100, Hans Verkuil wrote: > Hi Thierry, > > Thanks for the review, see my comments below. > > On 12/01/2014 02:15 PM, Thierry Reding wrote: > > On Fri, Nov 28, 2014 at 03:50:50PM +0100, Hans Verkuil wrote: [...] > >> +{ > >> + switch (type) { > >> + case HDMI_INFOFRAME_TYPE_VENDOR: return "Vendor"; > >> + case HDMI_INFOFRAME_TYPE_AVI: return "Auxiliary Video Information (AVI)"; > >> + case HDMI_INFOFRAME_TYPE_SPD: return "Source Product Description (SPD)"; > >> + case HDMI_INFOFRAME_TYPE_AUDIO: return "Audio"; > > > > I'd prefer "case ...:" and "return ...;" on separate lines for > > readability. > > I actually think that makes it *less* readable. If you really want that, then I'll > change it, but I would suggest that you try it yourself first to see if it is > really more readable for you. It isn't for me, so I'll keep this for the next > version. I did, and I still think separate lines are more readable, especially if you throw in a blank line after the "return ...;". Anyway, I could keep my OCD in check if it weren't for the fact that half of these are the cause for checkpatch to complain. And then if you change the ones that checkpatch wants you to change, all the others would be inconsistent and then I'd complain about the inconsistency... checkpatch flagged a couple other issues, please make sure to address those as well. > > Maybe include the numerical value here? Of course that either means that > > callers must pass in a buffer or we sacrifice thread-safety. The buffer > > could be optional, somewhat like this: > > > > const char *hdmi_infoframe_get_name(char *buffer, size_t length, > > enum hdmi_infoframe_type type) > > { > > const char *name = NULL; > > > > switch (type) { > > case HDMI_INFOFRAME_TYPE_VENDOR: > > name = "Vendor"; > > break; > > ... > > } > > > > if (buffer) { > > if (!name) > > snprintf(buffer, length, "unknown (%d)", type); > > else > > snprintf(buffer, length, name); > > > > name = buffer; > > } > > > > return name; > > } > > > > That way the function would be generally useful and could even be made > > publicly available. > > I would do this only where it makes sense. Some of these fields have only one or > two reserved bits left, and in that case is it easier to just say something > like "Reserved (3)" and do that for each reserved value. Okay. > >> +/** > >> + * hdmi_infoframe_log() - log info of HDMI infoframe > >> + * @dev: device > >> + * @frame: HDMI infoframe > >> + */ > >> +void hdmi_infoframe_log(struct device *dev, union hdmi_infoframe *frame) > >> +{ > >> + switch (frame->any.type) { > >> + case HDMI_INFOFRAME_TYPE_AVI: > >> + hdmi_avi_infoframe_log(dev, &frame->avi); > >> + break; > >> + case HDMI_INFOFRAME_TYPE_SPD: > >> + hdmi_spd_infoframe_log(dev, &frame->spd); > >> + break; > >> + case HDMI_INFOFRAME_TYPE_AUDIO: > >> + hdmi_audio_infoframe_log(dev, &frame->audio); > >> + break; > >> + case HDMI_INFOFRAME_TYPE_VENDOR: > >> + hdmi_vendor_any_infoframe_log(dev, &frame->vendor); > >> + break; > >> + default: > >> + WARN(1, "Bad infoframe type %d\n", frame->any.type); > > > > Does it make sense for this to be WARN? It's perfectly legal for future > > devices to expose new types of infoframes. Perhaps even expected. But if > > we want to keep this here to help get bug reports so that we don't > > forget to update this code, then maybe we should do the same wherever we > > query the name of enum values above. > > I'll drop the WARN from the log function. I think it should also be dropped > from the unpack. The only place it makes sense is for pack() since there the > data comes from the driver, not from an external source. Sounds good. Thierry
On Mon, Dec 01, 2014 at 04:33:31PM +0100, Thierry Reding wrote: > On Mon, Dec 01, 2014 at 02:48:47PM +0100, Hans Verkuil wrote: > > Hi Thierry, > > > > Thanks for the review, see my comments below. > > > > On 12/01/2014 02:15 PM, Thierry Reding wrote: > > > On Fri, Nov 28, 2014 at 03:50:50PM +0100, Hans Verkuil wrote: > [...] > > >> +{ > > >> + switch (type) { > > >> + case HDMI_INFOFRAME_TYPE_VENDOR: return "Vendor"; > > >> + case HDMI_INFOFRAME_TYPE_AVI: return "Auxiliary Video Information (AVI)"; > > >> + case HDMI_INFOFRAME_TYPE_SPD: return "Source Product Description (SPD)"; > > >> + case HDMI_INFOFRAME_TYPE_AUDIO: return "Audio"; > > > > > > I'd prefer "case ...:" and "return ...;" on separate lines for > > > readability. > > > > I actually think that makes it *less* readable. If you really want that, then I'll > > change it, but I would suggest that you try it yourself first to see if it is > > really more readable for you. It isn't for me, so I'll keep this for the next > > version. > > I did, and I still think separate lines are more readable, especially if > you throw in a blank line after the "return ...;". Anyway, I could keep > my OCD in check if it weren't for the fact that half of these are the > cause for checkpatch to complain. And then if you change the ones that > checkpatch wants you to change, all the others would be inconsistent and > then I'd complain about the inconsistency... Throwing in my own unasked-for bikshed opinion ;-) I agree with Thierry that it's more readable since this way the key and the value can be lined up easily. That's also possible with the single-line case/return like you do with some more tabs, but usually means all the lines overflow the 80 limit badly. So only really works for small defines/values. So my rule of thumb is - go with single-line case/return and align them - but break the lines if they would be too long. Now back to doing useful stuff for me. Cheers, Daniel
diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c index 9e758a8..9f0f554 100644 --- a/drivers/video/hdmi.c +++ b/drivers/video/hdmi.c @@ -27,10 +27,10 @@ #include <linux/export.h> #include <linux/hdmi.h> #include <linux/string.h> +#include <linux/device.h> -static void hdmi_infoframe_checksum(void *buffer, size_t size) +static u8 hdmi_infoframe_calc_checksum(u8 *ptr, size_t size) { - u8 *ptr = buffer; u8 csum = 0; size_t i; @@ -38,7 +38,14 @@ static void hdmi_infoframe_checksum(void *buffer, size_t size) for (i = 0; i < size; i++) csum += ptr[i]; - ptr[3] = 256 - csum; + return 256 - csum; +} + +static void hdmi_infoframe_set_checksum(void *buffer, size_t size) +{ + u8 *ptr = buffer; + /* update checksum */ + ptr[3] = hdmi_infoframe_calc_checksum(buffer, size); } /** @@ -136,7 +143,7 @@ ssize_t hdmi_avi_infoframe_pack(struct hdmi_avi_infoframe *frame, void *buffer, ptr[11] = frame->right_bar & 0xff; ptr[12] = (frame->right_bar >> 8) & 0xff; - hdmi_infoframe_checksum(buffer, length); + hdmi_infoframe_set_checksum(buffer, length); return length; } @@ -206,7 +213,7 @@ ssize_t hdmi_spd_infoframe_pack(struct hdmi_spd_infoframe *frame, void *buffer, ptr[24] = frame->sdi; - hdmi_infoframe_checksum(buffer, length); + hdmi_infoframe_set_checksum(buffer, length); return length; } @@ -281,7 +288,7 @@ ssize_t hdmi_audio_infoframe_pack(struct hdmi_audio_infoframe *frame, if (frame->downmix_inhibit) ptr[4] |= BIT(7); - hdmi_infoframe_checksum(buffer, length); + hdmi_infoframe_set_checksum(buffer, length); return length; } @@ -373,7 +380,7 @@ ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame, ptr[9] = (frame->s3d_ext_data & 0xf) << 4; } - hdmi_infoframe_checksum(buffer, length); + hdmi_infoframe_set_checksum(buffer, length); return length; } @@ -434,3 +441,604 @@ hdmi_infoframe_pack(union hdmi_infoframe *frame, void *buffer, size_t size) return length; } EXPORT_SYMBOL(hdmi_infoframe_pack); + +static const char *hdmi_infoframe_type_txt(enum hdmi_infoframe_type type) +{ + switch (type) { + case HDMI_INFOFRAME_TYPE_VENDOR: return "Vendor"; + case HDMI_INFOFRAME_TYPE_AVI: return "Auxiliary Video Information (AVI)"; + case HDMI_INFOFRAME_TYPE_SPD: return "Source Product Description (SPD)"; + case HDMI_INFOFRAME_TYPE_AUDIO: return "Audio"; + } + return "Invalid/Unknown"; +} + +static void hdmi_infoframe_log_header(struct device *dev, void *f) +{ + struct hdmi_any_infoframe *frame = f; + dev_info(dev, "HDMI infoframe: %s, version %d, length %d\n", + hdmi_infoframe_type_txt(frame->type), frame->version, frame->length); +} + +static const char *hdmi_colorspace_txt(enum hdmi_colorspace colorspace) +{ + switch (colorspace) { + case HDMI_COLORSPACE_RGB: return "RGB"; + case HDMI_COLORSPACE_YUV422: return "YCbCr 4:2:2"; + case HDMI_COLORSPACE_YUV444: return "YCbCr 4:4:4"; + case HDMI_COLORSPACE_YUV420: return "YCbCr 4:2:0"; + case HDMI_COLORSPACE_IDO_DEFINED: return "IDO Defined"; + } + return "Future"; +} + +static const char *hdmi_scan_mode_txt(enum hdmi_scan_mode scan_mode) +{ + switch(scan_mode) { + case HDMI_SCAN_MODE_NONE: return "No Data"; + case HDMI_SCAN_MODE_OVERSCAN: return "Composed for overscanned display"; + case HDMI_SCAN_MODE_UNDERSCAN: return "Composed for underscanned display"; + } + return "Future"; +} + +static const char *hdmi_colorimetry_txt(enum hdmi_colorimetry colorimetry) +{ + switch(colorimetry) { + case HDMI_COLORIMETRY_NONE: return "No Data"; + case HDMI_COLORIMETRY_ITU_601: return "ITU601"; + case HDMI_COLORIMETRY_ITU_709: return "ITU709"; + case HDMI_COLORIMETRY_EXTENDED: return "Extended"; + } + return "Invalid/Unknown"; +} + +static const char *hdmi_picture_aspect_txt(enum hdmi_picture_aspect picture_aspect) +{ + switch (picture_aspect) { + case HDMI_PICTURE_ASPECT_NONE: return "No Data"; + case HDMI_PICTURE_ASPECT_4_3: return "4:3"; + case HDMI_PICTURE_ASPECT_16_9: return "16:9"; + } + return "Future"; +} + +static const char *hdmi_active_aspect_txt(enum hdmi_active_aspect active_aspect) +{ + switch (active_aspect) { + case HDMI_ACTIVE_ASPECT_16_9_TOP: return "16:9 Top"; + case HDMI_ACTIVE_ASPECT_14_9_TOP: return "14:9 Top"; + case HDMI_ACTIVE_ASPECT_16_9_CENTER: return "16:9 Center"; + case HDMI_ACTIVE_ASPECT_PICTURE: return "Same as Picture"; + case HDMI_ACTIVE_ASPECT_4_3: return "4:3"; + case HDMI_ACTIVE_ASPECT_16_9: return "16:9"; + case HDMI_ACTIVE_ASPECT_14_9: return "14:9"; + case HDMI_ACTIVE_ASPECT_4_3_SP_14_9: return "4:3 SP 14:9"; + case HDMI_ACTIVE_ASPECT_16_9_SP_14_9: return "16:9 SP 14:9"; + case HDMI_ACTIVE_ASPECT_16_9_SP_4_3: return "16:9 SP 4:3"; + } + return "Invalid/Unknown"; +} + +static const char *hdmi_extended_colorimetry_txt(enum hdmi_extended_colorimetry extended_colorimetry) +{ + switch (extended_colorimetry) { + case HDMI_EXTENDED_COLORIMETRY_XV_YCC_601: return "xvYCC 601"; + case HDMI_EXTENDED_COLORIMETRY_XV_YCC_709: return "xvYCC 709"; + case HDMI_EXTENDED_COLORIMETRY_S_YCC_601: return "sYCC 601"; + case HDMI_EXTENDED_COLORIMETRY_ADOBE_YCC_601: return "Adobe YCC 601"; + case HDMI_EXTENDED_COLORIMETRY_ADOBE_RGB: return "Adobe RGB"; + case HDMI_EXTENDED_COLORIMETRY_BT2020_CONST_LUM: return "BT.2020 Constant Luminance"; + case HDMI_EXTENDED_COLORIMETRY_BT2020: return "BT.2020"; + } + return "Invalid/Unknown"; +} + +static const char *hdmi_quantization_range_txt(enum hdmi_quantization_range quantization_range) +{ + switch (quantization_range) { + case HDMI_QUANTIZATION_RANGE_DEFAULT: return "Default (depends on video format)"; + case HDMI_QUANTIZATION_RANGE_LIMITED: return "Limited"; + case HDMI_QUANTIZATION_RANGE_FULL: return "Full"; + } + return "Reserved"; +} + +static const char *hdmi_nups_txt(enum hdmi_nups nups) +{ + switch (nups) { + case HDMI_NUPS_UNKNOWN: return "No known non-uniform scaling"; + case HDMI_NUPS_HORIZONTAL: return "Horizontally scaled"; + case HDMI_NUPS_VERTICAL: return "Vertically scaled"; + case HDMI_NUPS_BOTH: return "Horizontally and Vertically scaled"; + } + return "Invalid/Unknown"; +} + +static const char *hdmi_ycc_quantization_range_txt(enum hdmi_ycc_quantization_range ycc_quantization_range) +{ + switch (ycc_quantization_range) { + case HDMI_YCC_QUANTIZATION_RANGE_LIMITED: return "Limited"; + case HDMI_YCC_QUANTIZATION_RANGE_FULL: return "Full"; + } + return "Invalid/Unknown"; +} + +static const char *hdmi_content_type_txt(enum hdmi_content_type content_type) +{ + switch (content_type) { + case HDMI_CONTENT_TYPE_NONE: return "None"; + case HDMI_CONTENT_TYPE_PHOTO: return "Photo"; + case HDMI_CONTENT_TYPE_CINEMA: return "Cinema"; + case HDMI_CONTENT_TYPE_GAME: return "Game"; + } + return "Invalid/Unknown"; +} + +/** + * hdmi_avi_infoframe_log() - log info of HDMI AVI infoframe + * @dev: device + * @frame: HDMI AVI infoframe + */ +static void hdmi_avi_infoframe_log(struct device *dev, struct hdmi_avi_infoframe *frame) +{ + hdmi_infoframe_log_header(dev, frame); + + dev_info(dev, " colorspace: %s\n", hdmi_colorspace_txt(frame->colorspace)); + dev_info(dev, " scan mode: %s\n", hdmi_scan_mode_txt(frame->scan_mode)); + dev_info(dev, " colorimetry: %s\n", hdmi_colorimetry_txt(frame->colorimetry)); + dev_info(dev, " picture aspect: %s\n", hdmi_picture_aspect_txt(frame->picture_aspect)); + dev_info(dev, " active aspect: %s\n", hdmi_active_aspect_txt(frame->active_aspect)); + dev_info(dev, " itc: %s\n", frame->itc ? "It Content" : "No Data"); + dev_info(dev, " extended colorimetry: %s\n", hdmi_extended_colorimetry_txt(frame->extended_colorimetry)); + dev_info(dev, " quantization range: %s\n", hdmi_quantization_range_txt(frame->quantization_range)); + dev_info(dev, " nups: %s\n", hdmi_nups_txt(frame->nups)); + dev_info(dev, " video code: %d\n", frame->video_code); + dev_info(dev, " ycc quantization range: %s\n", hdmi_ycc_quantization_range_txt(frame->ycc_quantization_range)); + dev_info(dev, " hdmi content type: %s\n", hdmi_content_type_txt(frame->content_type)); + dev_info(dev, " pixel repeat: %d\n", frame->pixel_repeat); + dev_info(dev, " bar top %d, bottom %d, left %d, right %d\n", frame->top_bar, frame->bottom_bar, frame->left_bar, frame->right_bar); +} + +static const char *hdmi_spd_sdi_txt(enum hdmi_spd_sdi sdi) +{ + switch (sdi) { + case HDMI_SPD_SDI_UNKNOWN: return "Unknown"; + case HDMI_SPD_SDI_DSTB: return "Digital STB"; + case HDMI_SPD_SDI_DVDP: return "DVD player"; + case HDMI_SPD_SDI_DVHS: return "D-VHS"; + case HDMI_SPD_SDI_HDDVR: return "HDD Videorecorder"; + case HDMI_SPD_SDI_DVC: return "DVC"; + case HDMI_SPD_SDI_DSC: return "DSC"; + case HDMI_SPD_SDI_VCD: return "Video CD"; + case HDMI_SPD_SDI_GAME: return "Game"; + case HDMI_SPD_SDI_PC: return "PC general"; + case HDMI_SPD_SDI_BD: return "Blu-Ray Disc (BD)"; + case HDMI_SPD_SDI_SACD: return "Super Audio CD"; + case HDMI_SPD_SDI_HDDVD: return "HD DVD"; + case HDMI_SPD_SDI_PMP: return "PMP"; + } + return "Reserved"; +} + +/** + * hdmi_spd_infoframe_log() - log info of HDMI SPD infoframe + * @dev: device + * @frame: HDMI SPD infoframe + */ +static void hdmi_spd_infoframe_log(struct device *dev, struct hdmi_spd_infoframe *frame) +{ + u8 buf[17]; + + hdmi_infoframe_log_header(dev, frame); + + memset(buf, 0, sizeof(buf)); + + strncpy(buf, frame->vendor, 8); + dev_info(dev, " vendor: %s\n", buf); + strncpy(buf, frame->product, 16); + dev_info(dev, " product: %s\n", buf); + dev_info(dev, " source device information: %s (0x%x)\n", + hdmi_spd_sdi_txt(frame->sdi), frame->sdi); +} + +static const char *hdmi_audio_coding_type_txt(enum hdmi_audio_coding_type coding_type) +{ + switch (coding_type) { + case HDMI_AUDIO_CODING_TYPE_STREAM: return "Refer to stream header"; + case HDMI_AUDIO_CODING_TYPE_PCM: return "PCM"; + case HDMI_AUDIO_CODING_TYPE_AC3: return "AC-3"; + case HDMI_AUDIO_CODING_TYPE_MPEG1: return "MPEG1"; + case HDMI_AUDIO_CODING_TYPE_MP3: return "MP3"; + case HDMI_AUDIO_CODING_TYPE_MPEG2: return "MPEG2"; + case HDMI_AUDIO_CODING_TYPE_AAC_LC: return "AAC"; + case HDMI_AUDIO_CODING_TYPE_DTS: return "DTS"; + case HDMI_AUDIO_CODING_TYPE_ATRAC: return "ATRAC"; + case HDMI_AUDIO_CODING_TYPE_DSD: return "One Bit Audio"; + case HDMI_AUDIO_CODING_TYPE_EAC3: return "Dolby Digital +"; + case HDMI_AUDIO_CODING_TYPE_DTS_HD: return "DTS-HD"; + case HDMI_AUDIO_CODING_TYPE_MLP: return "MAT (MLP)"; + case HDMI_AUDIO_CODING_TYPE_DST: return "DST"; + case HDMI_AUDIO_CODING_TYPE_WMA_PRO: return "WMA PRO"; + } + return "Reserved"; +} + +static const char *hdmi_audio_sample_size_txt(enum hdmi_audio_sample_size sample_size) +{ + switch (sample_size) { + case HDMI_AUDIO_SAMPLE_SIZE_STREAM: return "Refer to stream header"; + case HDMI_AUDIO_SAMPLE_SIZE_16: return "16 bit"; + case HDMI_AUDIO_SAMPLE_SIZE_20: return "20 bit"; + case HDMI_AUDIO_SAMPLE_SIZE_24: return "24 bit"; + } + return "Invalid/Unknown"; +} + +static const char *hdmi_audio_sample_frequency_txt(enum hdmi_audio_sample_frequency sample_frequency) +{ + switch (sample_frequency) { + case HDMI_AUDIO_SAMPLE_FREQUENCY_STREAM: return "Refer to stream header"; + case HDMI_AUDIO_SAMPLE_FREQUENCY_32000: return "32 kHz"; + case HDMI_AUDIO_SAMPLE_FREQUENCY_44100: return "44.1 kHz (CD)"; + case HDMI_AUDIO_SAMPLE_FREQUENCY_48000: return "48 kHz"; + case HDMI_AUDIO_SAMPLE_FREQUENCY_88200: return "88.2 kHz"; + case HDMI_AUDIO_SAMPLE_FREQUENCY_96000: return "96 kHz"; + case HDMI_AUDIO_SAMPLE_FREQUENCY_176400: return "176.4 kHz"; + case HDMI_AUDIO_SAMPLE_FREQUENCY_192000: return "192 kHz"; + } + return "Invalid/Unknown"; +} + +static const char *hdmi_audio_coding_type_ext_txt(enum hdmi_audio_coding_type_ext coding_type_ext) +{ + switch (coding_type_ext) { + case HDMI_AUDIO_CODING_TYPE_EXT_STREAM: return "Stream"; + case HDMI_AUDIO_CODING_TYPE_EXT_HE_AAC: return "HE AAC"; + case HDMI_AUDIO_CODING_TYPE_EXT_HE_AAC_V2: return "HE AAC v2"; + case HDMI_AUDIO_CODING_TYPE_EXT_MPEG_SURROUND: return "MPEG SURROUND"; + case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC: return "MPEG-4 HE AAC"; + case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC_V2: return "MPEG-4 HE AAC v2"; + case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_AAC_LC: return "MPEG-4 AAC LC"; + case HDMI_AUDIO_CODING_TYPE_EXT_DRA: return "DRA"; + case HDMI_AUDIO_CODING_TYPE_EXT_MPEG_HE_AAC_SURROUND: return "MPEG-4 HE AAC + MPEG Surround"; + case HDMI_AUDIO_CODING_TYPE_EXT_MPEG_AAC_LC_SURROUND: return "MPEG-4 AAC LC + MPEG Surround"; + } + return "Invalid/Unknown"; +} + +/** + * hdmi_audio_infoframe_log() - log info of HDMI AUDIO infoframe + * @dev: device + * @frame: HDMI AUDIO infoframe + */ +static void hdmi_audio_infoframe_log(struct device *dev, struct hdmi_audio_infoframe *frame) +{ + hdmi_infoframe_log_header(dev, frame); + + if (frame->channels) + dev_info(dev, " channels: %d ch\n", frame->channels - 1); + else + dev_info(dev, " channels: Refer to stream header\n"); + dev_info(dev, " coding type: %s\n", hdmi_audio_coding_type_txt(frame->coding_type)); + dev_info(dev, " sample size: %s\n", hdmi_audio_sample_size_txt(frame->sample_size)); + dev_info(dev, " sample frequency: %s\n", hdmi_audio_sample_frequency_txt(frame->sample_frequency)); + dev_info(dev, " coding type ext: %s\n", hdmi_audio_coding_type_ext_txt(frame->coding_type_ext)); + dev_info(dev, " channel allocation: %d\n", frame->channel_allocation); + dev_info(dev, " level shift value: %d db\n", frame->level_shift_value); + dev_info(dev, " downmix inhibit: %s\n", frame->downmix_inhibit ? "Yes" : "No"); +} + +static const char *hdmi_3d_structure_txt(enum hdmi_3d_structure s3d_struct) +{ + switch (s3d_struct) { + case HDMI_3D_STRUCTURE_INVALID: return "Invalid"; + case HDMI_3D_STRUCTURE_FRAME_PACKING: return "Frame packing"; + case HDMI_3D_STRUCTURE_FIELD_ALTERNATIVE: return "Field alternative"; + case HDMI_3D_STRUCTURE_LINE_ALTERNATIVE: return "Line alternative"; + case HDMI_3D_STRUCTURE_SIDE_BY_SIDE_FULL: return "Side-by-side (Full)"; + case HDMI_3D_STRUCTURE_L_DEPTH: return "L + depth"; + case HDMI_3D_STRUCTURE_L_DEPTH_GFX_GFX_DEPTH: return "L + depth + graphics + graphics-depth"; + case HDMI_3D_STRUCTURE_TOP_AND_BOTTOM: return "Top-and-Bottom"; + case HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF: return "Side-by-side (Half)"; + } + return "Invalid/Unknown"; +} + +/** + * hdmi_vendor_infoframe_log() - log info of HDMI VENDOR infoframe + * @dev: device + * @frame: HDMI VENDOR infoframe + */ +static void hdmi_vendor_any_infoframe_log(struct device *dev, union hdmi_vendor_any_infoframe *frame) +{ + struct hdmi_vendor_infoframe *hvf = &frame->hdmi; + + hdmi_infoframe_log_header(dev, frame); + + if (frame->any.oui != HDMI_IEEE_OUI) { + dev_info(dev, " not a HDMI vendor infoframe\n"); + return; + } + if (hvf->vic == 0 && hvf->s3d_struct == HDMI_3D_STRUCTURE_INVALID) { + dev_info(dev, " empty frame\n"); + return; + } + + if (hvf->vic) { + dev_info(dev, " Hdmi Vic: %d\n", hvf->vic); + } + if (hvf->s3d_struct != HDMI_3D_STRUCTURE_INVALID) { + dev_info(dev, " 3D structure: %s\n", hdmi_3d_structure_txt(hvf->s3d_struct)); + if (hvf->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF) + dev_info(dev, " 3D extension data: %d\n", hvf->s3d_ext_data); + } +} + +/** + * hdmi_infoframe_log() - log info of HDMI infoframe + * @dev: device + * @frame: HDMI infoframe + */ +void hdmi_infoframe_log(struct device *dev, union hdmi_infoframe *frame) +{ + switch (frame->any.type) { + case HDMI_INFOFRAME_TYPE_AVI: + hdmi_avi_infoframe_log(dev, &frame->avi); + break; + case HDMI_INFOFRAME_TYPE_SPD: + hdmi_spd_infoframe_log(dev, &frame->spd); + break; + case HDMI_INFOFRAME_TYPE_AUDIO: + hdmi_audio_infoframe_log(dev, &frame->audio); + break; + case HDMI_INFOFRAME_TYPE_VENDOR: + hdmi_vendor_any_infoframe_log(dev, &frame->vendor); + break; + default: + WARN(1, "Bad infoframe type %d\n", frame->any.type); + } +} +EXPORT_SYMBOL(hdmi_infoframe_log); + +/** + * hdmi_avi_infoframe_unpack() - unpack binary buffer to a HDMI AVI infoframe + * @buffer: source buffer + * @frame: HDMI AVI infoframe + * + * Unpacks the information contained in binary @buffer into a structured + * @frame of the HDMI Auxiliary Video (AVI) information frame. + * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4 specification. + * + * Returns 0 on success or a negative error code on failure. + */ +static int hdmi_avi_infoframe_unpack(void *buffer, struct hdmi_avi_infoframe *frame) +{ + u8 *ptr = buffer; + int ret; + + if (ptr[0] != HDMI_INFOFRAME_TYPE_AVI || + ptr[1] != 2 || + ptr[2] != HDMI_AVI_INFOFRAME_SIZE) { + return -EINVAL; + } + + if (hdmi_infoframe_calc_checksum(buffer, HDMI_INFOFRAME_SIZE(AVI)) != 0) + return -EINVAL; + + ret = hdmi_avi_infoframe_init(frame); + if (ret) + return ret; + + ptr += HDMI_INFOFRAME_HEADER_SIZE; + + frame->colorspace = (ptr[0] >> 5) & 0x3; + if (ptr[0] & 0x10) + frame->active_aspect = ptr[1] & 0xf; + if (ptr[0] & 0x8) { + frame->top_bar = (ptr[5] << 8) + ptr[6]; + frame->bottom_bar = (ptr[7] << 8) + ptr[8]; + } + if (ptr[0] & 0x4) { + frame->left_bar = (ptr[9] << 8) + ptr[10]; + frame->right_bar = (ptr[11] << 8) + ptr[12]; + } + frame->scan_mode = ptr[0] & 0x3; + + frame->colorimetry = (ptr[1] >> 6) & 0x3; + frame->picture_aspect = (ptr[1] >> 4) & 0x3; + frame->active_aspect = ptr[1] & 0xf; + + frame->itc = ptr[2] & 0x80 ? true : false; + frame->extended_colorimetry = (ptr[2] >> 4) & 0x7; + frame->quantization_range = (ptr[2] >> 2) & 0x3; + frame->nups = ptr[2] & 0x3; + + frame->video_code = ptr[3] & 0x7f; + frame->ycc_quantization_range = (ptr[4] >> 6) & 0x3; + frame->content_type = (ptr[4] >> 4) & 0x3; + + frame->pixel_repeat = ptr[4] & 0xf; + + return 0; +} + +/** + * hdmi_spd_infoframe_unpack() - unpack binary buffer to a HDMI SPD infoframe + * @buffer: source buffer + * @frame: HDMI SPD infoframe + * + * Unpacks the information contained in binary @buffer into a structured + * @frame of the HDMI Source Product Description (SPD) information frame. + * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4 specification. + * + * Returns 0 on success or a negative error code on failure. + */ +static int hdmi_spd_infoframe_unpack(void *buffer, struct hdmi_spd_infoframe *frame) +{ + u8 *ptr = buffer; + int ret; + + if (ptr[0] != HDMI_INFOFRAME_TYPE_SPD || + ptr[1] != 1 || + ptr[2] != HDMI_SPD_INFOFRAME_SIZE) { + return -EINVAL; + } + + if (hdmi_infoframe_calc_checksum(buffer, HDMI_INFOFRAME_SIZE(SPD)) != 0) + return -EINVAL; + + ptr += HDMI_INFOFRAME_HEADER_SIZE; + + ret = hdmi_spd_infoframe_init(frame, ptr, ptr + 8); + if (ret) + return ret; + + frame->sdi = ptr[24]; + + return 0; +} + +/** + * hdmi_audio_infoframe_unpack() - unpack binary buffer to a HDMI AUDIO infoframe + * @buffer: source buffer + * @frame: HDMI Audio infoframe + * + * Unpacks the information contained in binary @buffer into a structured + * @frame of the HDMI Audio information frame. + * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4 specification. + * + * Returns 0 on success or a negative error code on failure. + */ +static int hdmi_audio_infoframe_unpack(void *buffer, struct hdmi_audio_infoframe *frame) +{ + u8 *ptr = buffer; + int ret; + + if (ptr[0] != HDMI_INFOFRAME_TYPE_AUDIO || + ptr[1] != 1 || + ptr[2] != HDMI_AUDIO_INFOFRAME_SIZE) { + return -EINVAL; + } + + if (hdmi_infoframe_calc_checksum(buffer, HDMI_INFOFRAME_SIZE(AUDIO)) != 0) + return -EINVAL; + + ret = hdmi_audio_infoframe_init(frame); + if (ret) + return ret; + + ptr += HDMI_INFOFRAME_HEADER_SIZE; + + frame->channels = ptr[0] & 0x7; + frame->coding_type = (ptr[0] >> 4) & 0xf; + frame->sample_size = ptr[1] & 0x3; + frame->sample_frequency = (ptr[1] >> 2) & 0x7; + frame->coding_type_ext = ptr[2] & 0x1f; + frame->channel_allocation = ptr[3]; + frame->level_shift_value = (ptr[4] >> 3) & 0xf; + frame->downmix_inhibit = ptr[4] & 0x80 ? true : false; + + return 0; +} + +/** + * hdmi_vendor_infoframe_unpack() - unpack binary buffer to a HDMI vendor infoframe + * @buffer: source buffer + * @frame: HDMI Vendor infoframe + * + * Unpacks the information contained in binary @buffer into a structured + * @frame of the HDMI Vendor information frame. + * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4 specification. + * + * Returns 0 on success or a negative error code on failure. + */ +static int hdmi_vendor_any_infoframe_unpack(void *buffer, union hdmi_vendor_any_infoframe *frame) +{ + u8 *ptr = buffer; + size_t length; + int ret; + u8 hdmi_video_format; + struct hdmi_vendor_infoframe *hvf = &frame->hdmi; + + if (ptr[0] != HDMI_INFOFRAME_TYPE_VENDOR || + ptr[1] != 1 || + (ptr[2] != 5 && ptr[2] != 6)) + return -EINVAL; + + length = ptr[2]; + + if (hdmi_infoframe_calc_checksum(buffer, HDMI_INFOFRAME_HEADER_SIZE + length) != 0) + return -EINVAL; + + ptr += HDMI_INFOFRAME_HEADER_SIZE; + + /* HDMI OUI */ + if ((ptr[0] != 0x03) || + (ptr[1] != 0x0c) || + (ptr[2] != 0x00)) + return -EINVAL; + + hdmi_video_format = ptr[3] >> 5; + + if (hdmi_video_format > 0x2) + return -EINVAL; + + ret = hdmi_vendor_infoframe_init(hvf); + if (ret) + return ret; + + hvf->length = length; + + if (hdmi_video_format == 0x1) { + hvf->vic = ptr[4]; + } else if (hdmi_video_format == 0x2) { + hvf->s3d_struct = ptr[4] >> 4; + if (hvf->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF) { + if (length == 6) + hvf->s3d_ext_data = ptr[5] >> 4; + else + return -EINVAL; + } + } + + return 0; +} + +/** + * hdmi_infoframe_unpack() - unpack binary buffer to a HDMI infoframe + * @buffer: source buffer + * @frame: HDMI infoframe + * + * Unpacks the information contained in binary buffer @buffer into a structured + * @frame of a HDMI infoframe. + * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4 specification. + * + * Returns 0 on success or a negative error code on failure. + */ +int hdmi_infoframe_unpack(void *buffer, union hdmi_infoframe *frame) +{ + int ret; + u8 *ptr = buffer; + + switch (ptr[0]) { + case HDMI_INFOFRAME_TYPE_AVI: + ret = hdmi_avi_infoframe_unpack(buffer, &frame->avi); + break; + case HDMI_INFOFRAME_TYPE_SPD: + ret = hdmi_spd_infoframe_unpack(buffer, &frame->spd); + break; + case HDMI_INFOFRAME_TYPE_AUDIO: + ret = hdmi_audio_infoframe_unpack(buffer, &frame->audio); + break; + case HDMI_INFOFRAME_TYPE_VENDOR: + ret = hdmi_vendor_any_infoframe_unpack(buffer, &frame->vendor); + break; + default: + WARN(1, "Bad infoframe type %d\n", ptr[0]); + ret = -EINVAL; + } + + return ret; +} +EXPORT_SYMBOL(hdmi_infoframe_unpack); diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h index 38fd2a0..e6adae4 100644 --- a/include/linux/hdmi.h +++ b/include/linux/hdmi.h @@ -10,6 +10,7 @@ #define __LINUX_HDMI_H_ #include <linux/types.h> +#include <linux/device.h> enum hdmi_infoframe_type { HDMI_INFOFRAME_TYPE_VENDOR = 0x81, @@ -304,5 +305,7 @@ union hdmi_infoframe { ssize_t hdmi_infoframe_pack(union hdmi_infoframe *frame, void *buffer, size_t size); +int hdmi_infoframe_unpack(void *buffer, union hdmi_infoframe *frame); +void hdmi_infoframe_log(struct device *dev, union hdmi_infoframe *frame); #endif /* _DRM_HDMI_H */