On Thu, 2015-07-23 at 09:37 +0000, Tirdea, Irina wrote: > > > -----Original Message----- > > From: linux-iio-owner@xxxxxxxxxxxxxxx [mailto: > > linux-iio-owner@xxxxxxxxxxxxxxx] On Behalf Of Bastien Nocera > > Sent: 22 July, 2015 21:49 > > To: linux-iio@xxxxxxxxxxxxxxx > > Subject: bmc150_accel i2c-BMA250E:00: Invalid chip f8 > > > > Hey, > > > > Running kernel 4.0.8 on a WinBook TW100 tablet, I get the error > > message > > in the subject line when loading the bmc150_accel driver. > > > > The 2 items in udev about that device: > > P: /devices/LNXSYSTM:00/LNXSYBUS:00/80860F41:04/BMA250E:00 > > E: DEVPATH=/devices/LNXSYSTM:00/LNXSYBUS:00/80860F41:04/BMA250E:00 > > E: MODALIAS=acpi:BMA250E:BMA250E: > > E: SUBSYSTEM=acpi > > > > and: > > P: /devices/platform/80860F41:04/i2c-12/i2c-BMA250E:00 > > E: DEVPATH=/devices/platform/80860F41:04/i2c-12/i2c-BMA250E:00 > > E: MODALIAS=acpi:BMA250E:BMA250E: > > E: SUBSYSTEM=i2c > > > > And the DSDT for the device: > > https://people.gnome.org/~hadess/Winbook%20TW100%20DSDT.dsl > > > > Any ideas what I should try (apart from a more recent kernel, I'm > > onto > > that...) > > Hi Bastien, > > Seems to me that the ACPI table declares you have BMA250E chip, but > the hardware is actually BMA222E. Bosh accelerometer BMA250E has chip > ID 0xF9 [1], while BMA222E has chip ID 0xF8 [2]. I gathered as much from reading the driver. > These chips are very similar, except for the chip id and x/y/z > resolution. > > You could try forcing the driver to use bma222e for your ACPI ID and > see > if the values you get for acceleration are OK. Will try that. <snip> > In case it works you probably need to modify your ACPI table. But I won't do that. Windows works on the same system, and so should Linux. I'm guessing that the Linux driver is more stringent than the Windows one. I'd do something like: - ACPI ID just tells you which driver to load, not which variant it actually is. - Use the chip ID to see which variant of the chipset it is I'll test that after identifying which of the variants it is. Cheers -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
