On Sat, Apr 30, 2016 at 6:10 PM, Martin Kepplinger <martink@xxxxxxxxx> wrote: > Am 2016-04-27 um 13:51 schrieb Daniel Baluta: >> On Wed, Apr 27, 2016 at 2:36 PM, Martin Kepplinger <martink@xxxxxxxxx> wrote: >>> Hi roberta or anyone who uses a diolan i2c/spi bridge device, >>> >>> I try to do get the kernel driver for the connected chip loaded, but I'm >>> having some trouble getting it right. >>> >>> Cables are connected to the device (i2c), and the (mainline) kernel >>> driver for the diolan DLN-2 device is compiled and loaded on plugin. >>> >>> I don't use any of their (userspace) software. >>> >>> Now I get a new i2c bus and can manually instanciate my driver >>> >>> root@laptop:/sys/bus/i2c/devices/i2c-7# echo mma8452 0x1c > new_device >>> >>> and the driver loads. (Now for development, later maybe for merging) I >>> added acpi support, I guess I'd need it, but ACPI_HANDLE(&client->dev) >>> isn't true (during probe) hence we don't continue. I append my >>> adding-acpi-patch below. >>> >>> How do you do it? >>> >>> Do *you* manually instantiate your i2c-driver during development with >>> your diolan device or should it somehow even get loaded automatically? >>> >> >> Hi Martin, >> >> Please also use the following two patches: >> >> https://lkml.org/lkml/2014/12/16/290 >> https://lkml.org/lkml/2014/12/16/289 >> >> How does your setup looks like? >> > > Those patches don't apply anymore, also because of API changes. I save > them but I'll ignore the ACPI problem for now. Oh well, for development > only, I skip it and go ahead and try to write and read registers. > > Different problem: > > i2c_smbus_read_byte_data always returns with "Protocol Error". > > DLN-2 jumpers are correct. Is there anything special to consider, using > the DLN-2, regardless of which chip you are talking to? > Please check the wiring. Also make sure you run at the correct voltage for your specific chip. One other thing, is the firmware version. http://dlnware.com/Downloads AFAIK Diolan by default comes in U2C compatiblity mode which will not work with DLN2 drivers. Daniel. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
