Mauro Carvalho Chehab wrote: >> + tm6000_read_write_usb (dev, 0xc0, 0x10, 0x7f1f, 0x0000, buf, 2); > Most of the calls there are read (0xc0). I don't know any device that requires > a read for it to work. I suspect that the above code is just probing to check > what i2c devices are found at the board. Btw, by looking at drivers/media/dvb/frontends/zl10353_priv.h, we have an idea on what the above does: The register 0x7f is: CHIP_ID = 0x7F, So, basically, the above code is reading the ID of the chip, likely to be sure that it is a Zarlink 10353. Cheers, Mauro -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html