Hi, The Motorola Droid 4 has a vibrator, that is connected to two GPIOs. Motorola's stock kernel names them vib_en and vib_dir, which probably stand for vibrator_enable and vibrator_direction. In their stock kernel both GPIOs are toggled using a hrtimer and a custom vibrator "misc" device is provided to userspace. Thankfully the hardware designers the used GPIOs can also be used from OMAP's dmtimers, so that they can be driven as PWM output instead saving some CPU cycles (and code). The driver is loosely based on an old patch from Dmitry, that I found in the internet(tm) [0]. Note, that I did not check the generic vibrator stuff. I just kept it in the driver, since it's probably what other people expect from a pwm-vibra driver :) Also I wrote a small tool to test the vibrator running at different strength levels, since fftest(1) used a fixed one. [0] https://lkml.org/lkml/2012/4/10/41 [1] https://git.collabora.com/cgit/user/sre/rumble-test.git/plain/rumble-test.c -- Sebastian Sebastian Reichel (2): Input: pwm-vibra: new driver ARM: dts: omap4-droid4: Add vibrator .../devicetree/bindings/input/pwm-vibrator.txt | 60 ++++ arch/arm/boot/dts/omap4-droid4-xt894.dts | 38 +++ drivers/input/misc/Kconfig | 11 + drivers/input/misc/Makefile | 1 + drivers/input/misc/pwm-vibra.c | 343 +++++++++++++++++++++ 5 files changed, 453 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/pwm-vibrator.txt create mode 100644 drivers/input/misc/pwm-vibra.c -- 2.11.0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
