[Gumstix-users] Linux 3.5 i2c_transfer problem for e-con systems driver (ov3640)

[Tom H. <Bas...@gm...>]

Hello,
I have a problem with the use of the i2c_transfer function.

I want to implement the camera sensor driver (ov3640) from e-con systems
into the linux kernel 3.5. I got the driver sources from e-con-systems for
the use with the kernel 2.6.34. My problem is that the i2c_transfer function
gives me an errorcode -121 back. But I really don't know what I did wrong or
missed. I am working with an gumstix overo board with an OMAP3730 on it. So
I added into the board-overo.c file:

/#define LM3553_SLAVE_ADDRESS 0x53
#define OV3640_I2C_ADDR (0x78 >> 1)
int omap3evm_ov3640_platform_data;
int lm3553_platform_data;
static struct i2c_board_info __initdata omap3_i2c_boardinfo_3[] = {
{
I2C_BOARD_INFO("ov3640", OV3640_I2C_ADDR),
.platform_data = &omap3evm_ov3640_platform_data,
},
{
I2C_BOARD_INFO("lm3553",LM3553_SLAVE_ADDRESS),
.platform_data = &lm3553_platform_data,
},
};
static int __init overo_i2c_init(void)
{
u32 pdata_flags = 0;
u32 regulators_flags = TWL_COMMON_REGULATOR_VPLL2;
#if defined(CONFIG_USB_MUSB_HDRC) || \
defined (CONFIG_USB_MUSB_HDRC_MODULE)
pdata_flags |= TWL_COMMON_PDATA_USB;
#endif
#if defined(CONFIG_MFD_TWL4030_AUDIO) || \
defined (CONFIG_MFD_TWL4030_AUDIO_MODULE)
pdata_flags |= TWL_COMMON_PDATA_AUDIO;
#endif
#if defined(CONFIG_TWL4030_MADC) || \
defined (CONFIG_TWL4030_MADC_MODULE)
pdata_flags |= TWL_COMMON_PDATA_MADC;
#endif
#if defined(CONFIG_OMAP2_DSS) || defined(CONFIG_OMAP2_DSS_MODULE)
regulators_flags |= TWL_COMMON_REGULATOR_VDAC;
#endif
omap3_pmic_get_config(&overo_twldata, pdata_flags,
regulators_flags);
overo_twldata.vpll2->constraints.name = "VDVI";
omap3_pmic_init("tps65950", &overo_twldata);
/* i2c2 pins are used for gpio */
//omap_register_i2c_bus(3, 400, NULL, 0);
int ret;
ret = omap_register_i2c_bus(3, 400, omap3_i2c_boardinfo_3,
ARRAY_SIZE(omap3_i2c_boardinfo_3));
return 0;
}/

to register the camera sensor on the i2c bus. I also gave my driver the same
name an registered it like that:

/static const struct i2c_device_id ov3640_id[] = {
{ "ov3640", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ov3640_id);
static struct i2c_driver ov3640_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "ov3640",
},
.probe = ov3640_probe,
.remove = __exit_p(ov3640_remove),
.id_table = ov3640_id,
};
module_i2c_driver(ov3640_driver);/

this seems to work, because the probe function was called when I made
"insmod".

Within the driver I called:

/v4l2_i2c_subdev_init(sd, client, &ov3640_ops); /

Do you have an idea what I need to do or what I forgot to do to make sure
that the camera sensor can use i2c?

Regards, Tom