On Mon, 12 Jan 2009 11:50:28 +0530 Trilok Soni <soni.trilok@xxxxxxxxx> wrote: > Hi Tobias, > > On Sat, Nov 29, 2008 at 7:36 PM, Tobias Lorenz <tobias.lorenz@xxxxxxx> wrote: > > Hi Trilok, > > > >> Anybody working on FM transmitter related drivers support under v4l2? > > > >> If no, what parts of v4l2 which could be tweaked in right order to > > > >> support such devices? I see that SI471x series seem to have FM > > > >> transmitters too. > > > > right, there are several Si47xx series: > > > > Si470x: receivers only > > > > Si471x: transmitter only > > FYI..now maemo kernel team seems to have written Si4713 FM transmitter > driver interfaced over I2C. It is available in the kernel diff here. > > http://repository.maemo.org/pool/maemo5.0/free/k/kernel/kernel_2.6.27-20084805r03.diff.gz > > Please download and unzip it and search for > > radio-si4713.c Hi Trilok. Thanks for pointing us for the driver. The driver seems interesting, but I see a few issues with their approach: 1) it is creating a sysfs API for controlling some of the characteristics of the radio. Public API's should be discussed with enough care at linux-media@xxxxxxxxxxxxxxx before their addition on a driver, and properly documented. Also, IMO, the better would be to use VIDIOC_[G|C]_CTRL calls for this, or to create another ioctl for handling FM transmission; 2) a V4L2 application has no means to determine that the device is a FM transmission device. We need to add some capability flags to inform this to userspace. While there, I noticed also a driver for radio-tea5761 and a patch for common/tuners/tea5761.c. This also deserves review at linux-media@xxxxxxxxxxxxxxxx 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
