From: Ville Syrjälä ville.syrjala@linux.intel.com
Add the code to deal with the NTSC VBI infoframe.
I decided against parsing the PES_data_field and just leave it as an opaque blob, just dumping it out as hex in the log.
Blindly typed from the spec, and totally untested.
Cc: Thierry Reding thierry.reding@gmail.com Cc: Hans Verkuil hans.verkuil@cisco.com Cc: linux-media@vger.kernel.org Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com --- drivers/video/hdmi.c | 208 +++++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/hdmi.h | 18 +++++ 2 files changed, 226 insertions(+)
diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c index 3d24c7746c51..3c320d69fa0a 100644 --- a/drivers/video/hdmi.c +++ b/drivers/video/hdmi.c @@ -831,6 +831,139 @@ ssize_t hdmi_mpeg_source_infoframe_pack(struct hdmi_mpeg_source_infoframe *frame } EXPORT_SYMBOL(hdmi_mpeg_source_infoframe_pack);
+/** + * hdmi_ntsc_vbi_infoframe_init() - initialize an HDMI NTSC VBI infoframe + * @frame: HDMI NTSC VBI infoframe + * @pes_data_field: ANSI/SCTE 127 PES_data_field + * @length: ANSI/SCTE 127 PES_data_field length + * + * Returns 0 on success or a negative error code on failure. + */ +int hdmi_ntsc_vbi_infoframe_init(struct hdmi_ntsc_vbi_infoframe *frame, + const void *pes_data_field, + size_t length) +{ + if (length < 1 || length > 27) + return -EINVAL; + + memset(frame, 0, sizeof(*frame)); + + frame->type = HDMI_INFOFRAME_TYPE_NTSC_VBI; + frame->version = 1; + frame->length = length; + + memcpy(frame->pes_data_field, pes_data_field, length); + + return 0; +} +EXPORT_SYMBOL(hdmi_ntsc_vbi_infoframe_init); + +static int hdmi_ntsc_vbi_infoframe_check_only(const struct hdmi_ntsc_vbi_infoframe *frame) +{ + if (frame->type != HDMI_INFOFRAME_TYPE_NTSC_VBI || + frame->version != 1 || + frame->length < 1 || frame->length > 27) + return -EINVAL; + + if (frame->pes_data_field[0] != 0x99) + return -EINVAL; + + return 0; +} + +/** + * hdmi_ntsc_vbi_infoframe_check() - Check and check a HDMI NTSC VBI infoframe + * @frame: HDMI NTSC VBI infoframe + * + * Validates that the infoframe is consistent and updates derived fields + * (eg. length) based on other fields. + * + * Returns 0 on success or a negative error code on failure. + */ +int hdmi_ntsc_vbi_infoframe_check(struct hdmi_ntsc_vbi_infoframe *frame) +{ + return hdmi_ntsc_vbi_infoframe_check_only(frame); +} +EXPORT_SYMBOL(hdmi_ntsc_vbi_infoframe_check); + +/** + * hdmi_ntsc_vbi_infoframe_pack_only() - write HDMI NTSC VBI infoframe to binary buffer + * @frame: HDMI NTSC VBI infoframe + * @buffer: destination buffer + * @size: size of buffer + * + * Packs the information contained in the @frame structure into a binary + * representation that can be written into the corresponding controller + * registers. Also computes the checksum as required by section 5.3.5 of + * the HDMI 1.4 specification. + * + * Returns the number of bytes packed into the binary buffer or a negative + * error code on failure. + */ +ssize_t hdmi_ntsc_vbi_infoframe_pack_only(const struct hdmi_ntsc_vbi_infoframe *frame, + void *buffer, size_t size) +{ + u8 *ptr = buffer; + size_t length; + int ret; + + ret = hdmi_ntsc_vbi_infoframe_check_only(frame); + if (ret) + return ret; + + length = HDMI_INFOFRAME_HEADER_SIZE + frame->length; + + if (size < length) + return -ENOSPC; + + memset(buffer, 0, size); + + ptr[0] = frame->type; + ptr[1] = frame->version; + ptr[2] = frame->length; + ptr[3] = 0; /* checksum */ + + /* start infoframe payload */ + ptr += HDMI_INFOFRAME_HEADER_SIZE; + + memcpy(ptr, frame->pes_data_field, frame->length); + + hdmi_infoframe_set_checksum(buffer, length); + + return length; +} +EXPORT_SYMBOL(hdmi_ntsc_vbi_infoframe_pack_only); + +/** + * hdmi_ntsc_vbi_infoframe_pack() - Check and check a HDMI NTSC VBI infoframe, + * and write it to binary buffer + * @frame: HDMI NTSC VBI infoframe + * @buffer: destination buffer + * @size: size of buffer + * + * Validates that the infoframe is consistent and updates derived fields + * (eg. length) based on other fields, after which packs the information + * contained in the @frame structure into a binary representation that + * can be written into the corresponding controller registers. Also + * computes the checksum as required by section 5.3.5 of the HDMI 1.4 + * specification. + * + * Returns the number of bytes packed into the binary buffer or a negative + * error code on failure. + */ +ssize_t hdmi_ntsc_vbi_infoframe_pack(struct hdmi_ntsc_vbi_infoframe *frame, + void *buffer, size_t size) +{ + int ret; + + ret = hdmi_ntsc_vbi_infoframe_check(frame); + if (ret) + return ret; + + return hdmi_ntsc_vbi_infoframe_pack_only(frame, buffer, size); +} +EXPORT_SYMBOL(hdmi_ntsc_vbi_infoframe_pack); + /** * hdmi_infoframe_check() - Check check a HDMI infoframe * @frame: HDMI infoframe @@ -854,6 +987,8 @@ hdmi_infoframe_check(union hdmi_infoframe *frame) return hdmi_vendor_any_infoframe_check(&frame->vendor); case HDMI_INFOFRAME_TYPE_MPEG_SOURCE: return hdmi_mpeg_source_infoframe_check(&frame->mpeg_source); + case HDMI_INFOFRAME_TYPE_NTSC_VBI: + return hdmi_ntsc_vbi_infoframe_check(&frame->ntsc_vbi); default: WARN(1, "Bad infoframe type %d\n", frame->any.type); return -EINVAL; @@ -901,6 +1036,10 @@ hdmi_infoframe_pack_only(const union hdmi_infoframe *frame, void *buffer, size_t length = hdmi_mpeg_source_infoframe_pack_only(&frame->mpeg_source, buffer, size); break; + case HDMI_INFOFRAME_TYPE_NTSC_VBI: + length = hdmi_ntsc_vbi_infoframe_pack_only(&frame->ntsc_vbi, + buffer, size); + break; default: WARN(1, "Bad infoframe type %d\n", frame->any.type); length = -EINVAL; @@ -951,6 +1090,10 @@ hdmi_infoframe_pack(union hdmi_infoframe *frame, length = hdmi_mpeg_source_infoframe_pack(&frame->mpeg_source, buffer, size); break; + case HDMI_INFOFRAME_TYPE_NTSC_VBI: + length = hdmi_ntsc_vbi_infoframe_pack(&frame->ntsc_vbi, + buffer, size); + break; default: WARN(1, "Bad infoframe type %d\n", frame->any.type); length = -EINVAL; @@ -975,6 +1118,8 @@ static const char *hdmi_infoframe_type_get_name(enum hdmi_infoframe_type type) return "Audio"; case HDMI_INFOFRAME_TYPE_MPEG_SOURCE: return "MPEG Source"; + case HDMI_INFOFRAME_TYPE_NTSC_VBI: + return "NTSC VBI"; } return "Reserved"; } @@ -1526,6 +1671,22 @@ static void hdmi_mpeg_source_infoframe_log(const char *level, frame->field_repeat ? "Yes" : "No"); }
+/** + * hdmi_ntsc_vbi_infoframe_log() - log info of HDMI NTSC VBI infoframe + * @level: logging level + * @dev: device + * @frame: HDMI NTSC VBI infoframe + */ +static void hdmi_ntsc_vbi_infoframe_log(const char *level, + struct device *dev, + const struct hdmi_ntsc_vbi_infoframe *frame) +{ + hdmi_infoframe_log_header(level, dev, + (const struct hdmi_any_infoframe *)frame); + + hdmi_log(" %*ph\n", frame->length, frame->pes_data_field); +} + /** * hdmi_infoframe_log() - log info of HDMI infoframe * @level: logging level @@ -1552,6 +1713,9 @@ void hdmi_infoframe_log(const char *level, case HDMI_INFOFRAME_TYPE_MPEG_SOURCE: hdmi_mpeg_source_infoframe_log(level, dev, &frame->mpeg_source); break; + case HDMI_INFOFRAME_TYPE_NTSC_VBI: + hdmi_ntsc_vbi_infoframe_log(level, dev, &frame->ntsc_vbi); + break; } } EXPORT_SYMBOL(hdmi_infoframe_log); @@ -1840,6 +2004,47 @@ static int hdmi_mpeg_source_infoframe_unpack(struct hdmi_mpeg_source_infoframe * return 0; }
+/** + * hdmi_ntsc_vbi_infoframe_unpack() - unpack binary buffer to a HDMI MPEG Source infoframe + * @frame: HDMI MPEG Source infoframe + * @buffer: source buffer + * @size: size of buffer + * + * Unpacks the information contained in binary @buffer into a structured + * @frame of the HDMI MPEG Source 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_ntsc_vbi_infoframe_unpack(struct hdmi_ntsc_vbi_infoframe *frame, + const void *buffer, size_t size) +{ + const u8 *ptr = buffer; + size_t length; + + if (size < HDMI_INFOFRAME_HEADER_SIZE) + return -EINVAL; + + if (ptr[0] != HDMI_INFOFRAME_TYPE_NTSC_VBI || + ptr[1] != 1 || + ptr[2] < 1 || ptr[2] > 27) + return -EINVAL; + + length = ptr[2]; + + if (size < HDMI_INFOFRAME_HEADER_SIZE + length) + return -EINVAL; + + if (hdmi_infoframe_checksum(buffer, + HDMI_INFOFRAME_HEADER_SIZE + length) != 0) + return -EINVAL; + + ptr += HDMI_INFOFRAME_HEADER_SIZE; + + return hdmi_ntsc_vbi_infoframe_init(frame, ptr, length); +} + /** * hdmi_infoframe_unpack() - unpack binary buffer to a HDMI infoframe * @frame: HDMI infoframe @@ -1878,6 +2083,9 @@ int hdmi_infoframe_unpack(union hdmi_infoframe *frame, case HDMI_INFOFRAME_TYPE_MPEG_SOURCE: ret = hdmi_mpeg_source_infoframe_unpack(&frame->mpeg_source, buffer, size); break; + case HDMI_INFOFRAME_TYPE_NTSC_VBI: + ret = hdmi_ntsc_vbi_infoframe_unpack(&frame->ntsc_vbi, buffer, size); + break; default: ret = -EINVAL; break; diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h index 2c9322f7538d..3821516b336c 100644 --- a/include/linux/hdmi.h +++ b/include/linux/hdmi.h @@ -48,6 +48,7 @@ enum hdmi_infoframe_type { HDMI_INFOFRAME_TYPE_SPD = 0x83, HDMI_INFOFRAME_TYPE_AUDIO = 0x84, HDMI_INFOFRAME_TYPE_MPEG_SOURCE = 0x85, + HDMI_INFOFRAME_TYPE_NTSC_VBI = 0x86, };
#define HDMI_IEEE_OUI 0x000c03 @@ -362,6 +363,21 @@ ssize_t hdmi_mpeg_source_infoframe_pack_only(const struct hdmi_mpeg_source_infof void *buffer, size_t size); int hdmi_mpeg_source_infoframe_check(struct hdmi_mpeg_source_infoframe *frame);
+struct hdmi_ntsc_vbi_infoframe { + enum hdmi_infoframe_type type; + unsigned char version; + unsigned char length; + unsigned char pes_data_field[27]; +}; + +int hdmi_ntsc_vbi_infoframe_init(struct hdmi_ntsc_vbi_infoframe *frame, + const void *pes_data_field, size_t length); +ssize_t hdmi_ntsc_vbi_infoframe_pack(struct hdmi_ntsc_vbi_infoframe *frame, + void *buffer, size_t size); +ssize_t hdmi_ntsc_vbi_infoframe_pack_only(const struct hdmi_ntsc_vbi_infoframe *frame, + void *buffer, size_t size); +int hdmi_ntsc_vbi_infoframe_check(struct hdmi_ntsc_vbi_infoframe *frame); + /** * union hdmi_infoframe - overall union of all abstract infoframe representations * @any: generic infoframe @@ -370,6 +386,7 @@ int hdmi_mpeg_source_infoframe_check(struct hdmi_mpeg_source_infoframe *frame); * @vendor: union of all vendor infoframes * @audio: audio infoframe * @mpeg_source: mpeg source infoframe + * @ntsc_vbi: ntsc vbi infoframe * * This is used by the generic pack function. This works since all infoframes * have the same header which also indicates which type of infoframe should be @@ -382,6 +399,7 @@ union hdmi_infoframe { union hdmi_vendor_any_infoframe vendor; struct hdmi_audio_infoframe audio; struct hdmi_mpeg_source_infoframe mpeg_source; + struct hdmi_ntsc_vbi_infoframe ntsc_vbi; };
ssize_t hdmi_infoframe_pack(union hdmi_infoframe *frame, void *buffer,