Manu Abraham wrote: > Johannes Stezenbach wrote: >> On Sun, May 20, 2007, e9hack wrote: >>> With the attached patch, it works for the stv0297 functions. It >>> doesn't solve the problem, why I've wrote the initial patch. I need a >>> dump from the registers of the stv0297. I've attach a second patch. >>> stv0297_attach() inserts a wrapper between i2ctransfer() and the >>> transfer function of the saa7146. The add/del functions for the >>> wrapper are a little bit >>> dirty. I didn't find a clean way for the add/del function. >> Hm, I was trying to tell you that the problem is in i2cdump, >> not in saa7146 or stv0297. >> >> i2cdump is simply limited to simple SMBUS-like transfers, >> but I think it wouldn't be difficult to extend it or >> write a new utility which uses the I2C_RDWR ioctl to >> perform the transfer as required by stv0297. > > I have been looking at the STV0297D/E datasheets specifically to check > this issue (and i don't see any differences than how it is "potentially' > differently from other devices): > > HTH > > > The STV0297D/E datasheet defines the transaction thus .. > > I2C Write: > > START > SLAVE ADDRESS > R/W > ACK > BASE ADDRESS > ACK > DATA BYTE 1 > ACK > DATA BYTE 2 > ACK > DATA BYTE 1 > ACK > DATA BYTE n > ACK > STOP > (All ACk's by the STV0297E) > > I2C Read: > > START > SLAVE ADDRESS > R/W > ACK (STV0297) > BASE ADDRESS > ACK (STV0297) > STOP > START > SLAVE ADDRESS > R/W > ACK (STV0297) > DATA BYTE 1 > ACK (Host) > DATA BYTE n > ACK (Host) > STOP > I did look at a couple of other demodulators from STM, on this aspect, even though not all or most devices, more than a few devices they do feature a STOP bit after the Address phase. The I2C_M_STOP flag makes sense in such a case, since it would be a generic case, than STV0297 specific. It is not a bug, nor it is specific to the STV0297. You win .. I think the windows driver just does a field_write, looking at some sample code here and there. _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
