hello
I am trying to read and write data on ADV7403 decoder IC on my designed
board. I have been through almost all questions regarding I2C bus with
ADV7403 but my problem still remains there.
You can send me source code of ADV7403.c and adv7403_regs.h
On Friday, September 7, 2012 at 2:38:10 AM UTC-7, shravan kulkarni wrote:
>
> Hi,
>
> I have a custom board built with ADV7403 video decoder/encoder
> ic which will be interfaced to Beagleboard-xM Rev.C. Im trying to write
> linux device driver for ADV7403 to work with RGB input signals and output
> of 10-bit 4:2:2 YCbCr. i have added the support of i2c into my device
> drivers. now i have to integrate V4L2 into my device driver.
>
> I have pasted the code below on what is done so far on V4L2.
>
>
> v4l2_i2c_subdev_init(&state->subdev, client, &adv7403_ops); // for
> V4L2_subdev initialization
>
> //--------------code to create the device
> node-----------------------------//
>
> struct video_device *vfd;
>
> vfd = video_device_alloc();
> if(vfd == NULL)
> {
> return -ENOMEM;
> printk("failed to create /dev/video node\n");
> vfd->release = video_device_release;
> }
>
> err = video_register_device(vfd, VFL_TYPE_GRABBER, -1);
> if(err) {
> video_device_release(vfd);
> printk("failed to register the device node /dev/videoX\n");
> return err;
> }
>
> //----------------------------code to create the device
> node-------------------------//
>
> v4l2_i2c_subdev_init() was included alone there was no error during
> compilation and run time....
>
> then vfd = video_device_alloc(); was included and here also there was no
> error....
>
> but on the next part... i.e.,
>
> err = video_register_device(vfd, VFL_TYPE_GRABBER, -1);
>
> i had a run time error which is pasted below..
>
>
> //------------------------------------error--------------------------------------//
>
> root@beagleboard-dvsdk:/lib/modules/2.6.32/kernel/drivers/media/video#
> insmod ad
> v7403.ko
> [ 82.966735] adv7403 2-0021: chip found @ 0x42 (OMAP I2C adapter)
> [ 82.990478] adv7403: Detected ADV7403 @ 25
> [ 82.994598] Memory is allocated
> [ 82.997863] ------------[ cut here ]------------
> [ 83.021789] WARNING: at drivers/media/video/v4l2-dev.c:421
> __video_register_device+0x44/0x3ec()
> [ 83.045166] Modules linked in: adv7403(+) sdmak lpm_omap3530
> <http://www.ti.com/product/omap3530> dsplinkk cmemk ipv6 rtc_twl rtc_core
> [ 83.068572] [<c003ab54>] (unwind_backtrace+0x0/0xdc) from [<c0065848>]
> (warn_slowpath_common+0x48/0x60)
> [ 83.086395] [<c0065848>] (warn_slowpath_common+0x48/0x60) from
> [<c034357c>] (__video_register_device+0x44/0x3ec)
> [ 83.097015] [<c034357c>] (__video_register_device+0x44/0x3ec) from
> [<bf0ad1e0>] (adv7403_probe+0x178/0x2ec [adv7403])
> [ 83.107940] [<bf0ad1e0>] (adv7403_probe+0x178/0x2ec [adv7403]) from
> [<c033fe24>] (i2c_device_probe+0x74/0x8c)
> [ 83.118133] [<c033fe24>] (i2c_device_probe+0x74/0x8c) from [<c02a87a4>]
> (driver_probe_device+0xc0/0x178)
> [ 83.127868] [<c02a87a4>] (driver_probe_device+0xc0/0x178) from
> [<c02a7c74>] (bus_for_each_drv+0x44/0x80)
> [ 83.137603] [<c02a7c74>] (bus_for_each_drv+0x44/0x80) from [<c02a89ac>]
> (device_attach+0x68/0x8c)
> [ 83.147003] [<c02a89ac>] (device_attach+0x68/0x8c) from [<c02a7af8>]
> (bus_probe_device+0x24/0x40)
> [ 83.156097] [<c02a7af8>] (bus_probe_device+0x24/0x40) from [<c02a6528>]
> (device_add+0x31c/0x490)
> [ 83.165100] [<c02a6528>] (device_add+0x31c/0x490) from [<c03410ac>]
> (i2c_new_device+0x154/0x1b0)
> [ 83.174133] [<c03410ac>] (i2c_new_device+0x154/0x1b0) from [<bf0b0070>]
> (adv7403_mod_init+0x70/0x94 [adv7403])
> [ 83.184356] [<bf0b0070>] (adv7403_mod_init+0x70/0x94 [adv7403]) from
> [<c0035364>] (do_one_initcall+0x5c/0x1b4)
> [ 83.194915] [<c0035364>] (do_one_initcall+0x5c/0x1b4) from [<c0096ed0>]
> (sys_init_module+0xb0/0x1dc)
> [ 83.204345] [<c0096ed0>] (sys_init_module+0xb0/0x1dc) from [<c0035f40>]
> (ret_fast_syscall+0x0/0x2c)
> [ 83.213653] ---[ end trace 09559d2558e8a7e2 ]---
> [ 83.218444] failed to register the device node /dev/videoX
> [ 83.223999] adv7403: probe of 2-0021 failed with error -22
> root@beagleboard-dvsdk:/lib/modules/2.6.32/kernel/drivers/media/video#
>
>
> //----------------------------------------error-----------------------------------------------//
>
>
> Q1. regarding v4l2_subdev
>
> during v4l2_i2c_subdev_int() only support for v4l2_subdev_core_ops(i.e.,
> g_chip_ident) but these functions are not accessed during run time.... is
> there any manual where i can get the details on the manner in which these
> functions are accessed.. or the reason why these functions are triggered..
>
> (these functions were added by referring the device drivers of ADV7180,
> TVP514x)
>
> Q2. regarding device node creation
>
> errno -22 represents INVALID ARGUMENT (reference:
> http://www-numi.fnal.gov/offline_software/srt_public_context/WebDocs/Errors/unix_system_errors.html
> )
>
> is it because i didnt fill the fields of structure video_device in my
> device driver?? if it is because of this then how do i fill the parameters
> of video_device...
>
> how do i solve this problem....??
>
>
> thanking you,
>
> Shravan Kulkarni
>
>
> P.S :-
>
> Host machine configuration:-
>
> Intel Core 2 Duo 2.4Ghz,
>
> 2GB RAM,
>
> O.S:- UBUNTU 10.04 (kernel:- 2.6.32)
>
>
> BeagleBoard-xM Rev.C configuration:-
>
> DM3730 <http://www.ti.com/product/DM3730> Processor
>
> 1Ghz, 512MB RAM
>
> O.S:- Angstrom Linux(kernel- 2.6.32)
>
> If there is any information that i have missed out or required please
> point it out
>
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