media: cx23885: Add analog support for AVerMedia H789-C PCIe card

media: cx23885: Add analog support for AVerMedia H789-C PCIe card

This card has the following ICs: Hybrid tuner TDA18271, CX23888 PCIe
bridge/demodulator/decoder (and DVB-T demodulator AF9013S, which is
not within the scope of this patch). It has the following inputs: Tuner,
S-Video, Composite (shared with the luma input of S-Video) and Audio L/R
RCA. VID:PID is 1461:e139. When the patch is applied and the cx23885
kernel module is built and loaded, the following dmesg can be seen:

[  749.677298] cx23885: cx23885 driver version 0.0.4 loaded
[  749.677554] cx23885: CORE cx23885[0]: subsystem: 1461:e139, board: AVerMedia H789-C [card=63,autodetected]
[  749.831841] cx25840 8-0044: cx23888 A/V decoder found @ 0x88 (cx23885[0])
[  750.451676] cx25840 8-0044: loaded v4l-cx23885-avcore-01.fw firmware (16382 bytes)
[  750.488064] tuner: 7-0063: Tuner -1 found with type(s) Radio TV.
[  750.488115] tda18271 7-0063: creating new instance
[  750.490153] tda18271: TDA18271HD/C2 detected @ 7-0063
[  750.805043] cx23885: cx23885[0]: registered device video2 [v4l2]
[  750.805151] cx23885: cx23885[0]: registered device vbi2
[  750.808682] cx23885: cx23885[0]: alsa: registered ALSA audio device
[  750.808693] cx23885: cx23885_dev_checkrevision() Hardware revision = 0xd0
[  750.808700] cx23885: cx23885[0]/0: found at 0000:02:00.0, rev: 4, irq: 18, latency: 0, mmio: 0xddc00000

The card has to be defined in cx23885-cards.c (firmware also has to be
loaded) and cx23885.h. Moreover, audio routing is configured in
cx23885-video.c. Analog tuning, composite, s-video and stereo audio
inputs have been successfully tested with PAL B/G.

Signed-off-by: Plamen Atanasov <tigerment@mail.bg>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>