On Tue, Dec 6, 2016 at 11:02 PM, Greg KH <greg@xxxxxxxxx> wrote: > On Tue, Dec 06, 2016 at 09:12:24PM -0800, Joel Fernandes wrote: >> On Tue, Dec 6, 2016 at 11:42 AM, Ran Shalit <ranshalit@xxxxxxxxx> wrote: >> > Hello, >> > >> > I have spi device which is registered using spi_register_board_info(), >> > and I would like to get a pointer to this device in some other kernel module. >> > >> > Is there a simple way to get a pointer to pointer to a device , so >> > that we can use it from other module ? (something like i2c_get_adapter >> > for i2c) >> >> Find out what's the SPI bus number (for the master) and the chip >> select on that SPI master (for the SPI device) >> >> Then you can use bus_for_each_device on spi_bus_type and find the >> spi_device you're looking for. See the following code for an example >> of how to use bus_for_each_device: >> >> http://lxr.free-electrons.com/source/drivers/spi/spi.c#L524 >> >> In your check function, just make sure your spi->master->bus_num is >> the bus you want and the spi->chip_select is the chip select >> corresponding to the device you want. If both these conditions are >> satisfied, there you have your spi_device. > > Eeek, no, please never do that, use the proper spi apis to get your > needed device. They are there somewhere, using a "raw" > bus_for_each_device is never the answer unless you are a bus and > iterating over your own device list. Yes I completely agree, maybe I assumed too much and thought he was trying to do this for some quick debugging from some kernel module, and was just looking for a quick and dirty way to get to a spi_device. Was not really suggesting this for production code. :) Regards, Joel > > thanks, > > greg k-h _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
