[DEV] Driver for analogue video grabber USB sticks

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beside my DVB-T stick, which is working very well with chulri's DVB-T drivers I have also an analogue frame grabber USB stick like the "Terratec Grabby" flying around.
I think it would be a nice feature, when the A101IT could also handle analogue video sources additional to DVB-sticks.
Those devices, along with some DVB-T sticks like are controlled with the em28xx kernel module.
The common chipset of those sticks includes USB-Bridge Empia EM2860, Philips SAA7113 (video decoder), EMP202 (AC'97 audio processor).
More information:
http://www.linuxtv.org/wiki/index.php/Em28xx_devices

Maybe later, this driver could be backmerged into chulri's DVB-T package.

Actual status:
I was able to compile the 2.6.29 based em28xx (along with dependent modules e.g. saa7115, em28xx-alsa, etc...) and load the kernel module on A101IT.
I did also a few minor modifactions, so that the Magix frame grabber stick with usbid 1b80:e34b is recognized correctly. (source files attached in em28xx_src.zip)
dmesg:

em28xx 2-1:1.0: usb_probe_interface
em28xx 2-1:1.0: usb_probe_interface - got id
em28xx: New device USB 2863 Device @ 480 Mbps (1b80:e34b, interface 0, class 0)
em28xx #0: Identified as Magix Videograbber (card=77)
em28xx #0: chip ID is em2860
saa7115' 4-0025: saa7113 found (1f7113d0e100000) @ 0x4a (em28xx #0)
em28xx #0: i2c eeprom 00: 1a eb 67 95 80 1b 4b e3 50 00 20 03 6a 20 00 00
em28xx #0: i2c eeprom 10: 00 00 04 57 06 02 00 00 00 00 00 00 00 00 00 00
em28xx #0: i2c eeprom 20: 02 00 01 00 f0 00 01 00 00 00 00 00 5b 00 00 00
em28xx #0: i2c eeprom 30: 00 00 20 40 20 80 02 20 01 01 02 01 00 00 00 00
em28xx #0: i2c eeprom 40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
em28xx #0: i2c eeprom 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
em28xx #0: i2c eeprom 60: 00 00 00 00 00 00 00 00 00 00 20 03 55 00 53 00 
em28xx #0: i2c eeprom 70: 42 00 20 00 32 00 38 00 36 00 33 00 20 00 44 00
em28xx #0: i2c eeprom 80: 65 00 76 00 69 00 63 00 65 00 00 00 00 00 00 00
em28xx #0: i2c eeprom 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
em28xx #0: i2c eeprom a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
em28xx #0: i2c eeprom b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
em28xx #0: i2c eeprom c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
em28xx #0: i2c eeprom d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
em28xx #0: i2c eeprom e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
em28xx #0: i2c eeprom f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
em28xx #0: EEPROM ID= 0x9567eb1a, EEPROM hash = 0x979a2140
em28xx #0: EEPROM info:
em28xx #0:      AC97 audio (5 sample rates)
em28xx #0:      500mA max power
em28xx #0:      Table at 0x04, strings=0x206a, 0x0000, 0x0000
em28xx #0: Registering snapshot button...
input: em28xx snapshot button as /devices/platform/musb_hdrc/usb2/2-1/input/input16
em28xx #0: Config register raw data: 0x50
em28xx #0: AC97 vendor ID = 0x83847650
em28xx #0: AC97 features = 0x6a90
em28xx #0: Empia 202 AC97 audio processor detected
em28xx #0: v4l2 driver version 0.1.1
em28xx #0: V4L2 device registered as /dev/video3 and /dev/vbi0
em28xx-audio.c: probing for em28x1 non standard usbaudio
em28xx-audio.c: Copyright (C) :eek:2006 Markus Rechberger

When I try now to do cat /dev/video3 > test.ts, then a memory allocation error occured:

cat: page allocation failure. order:5, mode:0x0
[<c03518f0>] (dump_stack+0x0/0x14) from [<c00bbb5c>] (__alloc_pages_internal+0x3c0/0x3e8)
[<c00bb79c>] (__alloc_pages_internal+0x0/0x3e8) from [<c00471a4>] (__dma_alloc+0x154/0x408)
[<c0047050>] (__dma_alloc+0x0/0x408) from [<c00474e4>] (dma_alloc_coherent+0x58/0x64)
[<c004748c>] (dma_alloc_coherent+0x0/0x64) from [<c0248db8>] (hcd_buffer_alloc+0x8c/0x94)
 r7:00000004 r6:c1dd1f00 r5:c9bf4000 r4:00000800
[<c0248d2c>] (hcd_buffer_alloc+0x0/0x94) from [<c023b8b4>] (usb_buffer_alloc+0x24/0x30)
 r5:c9bf4000 r4:c81aa800
[<c023b890>] (usb_buffer_alloc+0x0/0x30) from [<bf348768>] (em28xx_init_isoc+0x124/0x2dc [em28xx])
[<bf348644>] (em28xx_init_isoc+0x0/0x2dc [em28xx]) from [<bf344834>] (buffer_prepare+0xe8/0xf8 [em28xx])
[<bf34474c>] (buffer_prepare+0x0/0xf8 [em28xx]) from [<c0221dd0>] (__videobuf_read_start+0xbc/0x174)
 r7:00000001 r6:ca248c8c r5:ca248c90 r4:ca248c8c
[<c0221d14>] (__videobuf_read_start+0x0/0x174) from [<c0222028>] (videobuf_read_stream+0x90/0x248)
 r8:00000000 r7:00001000 r6:00001000 r5:ca601d40 r4:ca248c8c
[<c0221f98>] (videobuf_read_stream+0x0/0x248) from [<bf3453ac>] (em28xx_v4l2_read+0xc0/0xd0 [em28xx])
[<bf3452ec>] (em28xx_v4l2_read+0x0/0xd0 [em28xx]) from [<c0216a94>] (v4l2_read+0x50/0x58)
[<c0216a44>] (v4l2_read+0x0/0x58) from [<c00df654>] (vfs_read+0xb4/0x144)
 r5:ca601d40 r4:00001000
[<c00df5a0>] (vfs_read+0x0/0x144) from [<c00df7a8>] (sys_read+0x44/0x70)
 r7:00000000 r6:00000000 r5:becc6ae8 r4:ca601d40
[<c00df764>] (sys_read+0x0/0x70) from [<c0040e80>] (ret_fast_syscall+0x0/0x2c)
 r8:c0041028 r7:00000003 r6:becc6ae8 r5:00001000 r4:40092450
Mem-info:
Normal per-cpu:
CPU    0: hi:   90, btch:  15 usd:  85
Active_anon:9544 active_file:3850 inactive_anon:9574
 inactive_file:11687 unevictable:0 dirty:6 writeback:0 unstable:0
 free:7421 slab:2380 mapped:12278 pagetables:1318 bounce:0
Normal free:29684kB min:2036kB low:2544kB high:3052kB active_anon:38176kB inactive_anon:38296kB active_file:15400kB inactive_file:46748kB unevictable:0kB present:260096kB pages_scanned:33 all_unreclaimable? no
lowmem_reserve[]: 0 0
Normal: 7185*4kB 44*8kB 23*16kB 7*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 29684kB
15757 total pagecache pages
0 pages in swap cache
Swap cache stats: add 0, delete 0, find 0/0
Free swap  = 0kB
Total swap = 0kB
65536 pages of RAM
7910 free pages
10335 reserved pages
2380 slab pages
59244 pages shared
0 pages swap cached
unable to allocate 115680 bytes for transfer buffer 4

Instructions to load the driver:
1. Install chulri's DVB-T package:
http://code.google.com/p/archos-gen8...label:Featured

2. Read the Howto:
http://code.google.com/p/archos-gen8-dvb/wiki/HowToTest

3. Copy the content of the attached em28xx_mod.zip into the mod/ directory

4. sh loadmod mod/em28xx.ko

5. cat /dev/video3 > test.ts

Does someone have an idea, what could be be the cause for this memory allocation problem ? (maybe RAM shortage on the A101?)

Suggestions, comments and general support, to get this driver working are very welcome !

Best regards,
Onliner09

Thank you very much for this thread

I have an analogue frame grabber USB stick and need to use it with my Archos 101 too.

dmesg result:

...

usb 2-1: New USB device found, idVendor=07ca, idProduct=1827
usb 2-1: Product: AVerTV
usb 2-1: Manufacture: AVerMedia
usb 2-1: SerialNumber: 301306400071

...

usbid = 07ca:1827

I wish you can find the solutions to fix this problem and then I will join to test with you.