From 10c06d178df11b0b2b746321a80ea14241997127 Mon Sep 17 00:00:00 2001 From: "Milo(Woogyom) Kim" Date: Tue, 5 Feb 2013 19:17:20 +0900 Subject: leds-lp55xx: support firmware interface This patch provides additional device attributes which enable loading the firmware. ('select_engine' and 'run_engine') To run a LED pattern, two parts of driver should be enabled. Common features : lp55xx-common =============================== Firmware interface for loading LED patterns Chip specific features : leds-lp5521, leds-lp5523 ================================================= Register addresses for loading firmware data Register addresses for running selected engine Pattern programming sequence ============================ LP55xx chips have three program engines. To load and run a LED pattern, the programming sequence is as follows. (1) Select an engine number (1/2/3) (2) Set engine mode to load (3) Write pattern data into selected area (4) Set engine mode to run This sequence is almost same as the firmware interface. (1) Select an engine number : 'select_engine' dev attribute (2) Mode change to load : 'loading' of firmware class (3) Write pattern data into selected area : 'data' of firmware class (4) Mode change to run : 'run_engine' dev attribute (1) and (4) are device specific features which provide callback functions (2) and (3) are common features. For example, echo 1 or 2 or 3 > /sys/bus/i2c/devices/xxxx/select_engine echo 1 > /sys/class/firmware/lp5521/loading echo "4000600040FF6000" > /sys/class/firmware/lp5521/data echo 0 > /sys/class/firmware/lp5521/loading echo 1 > /sys/bus/i2c/devices/xxxx/run_engine As soon as 'loading' is set to 0, registered callback is called. Inside the callback, the selected engine is loaded and memory is updated. To run programmed pattern, 'run_engine' attribute should be enabled. Device specific data structure ============================== o Firmware callback load selected engine and update program memory o Run engine change the engine mode o 'engine_idx' and firmware data, 'fw' Those are used in the driver internally with callback functions Signed-off-by: Milo(Woogyom) Kim Signed-off-by: Bryan Wu --- drivers/leds/Kconfig | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/leds/Kconfig') diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 3d7822b3498f..fc680a9ed841 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -196,6 +196,7 @@ config LEDS_LP3944 config LEDS_LP55XX_COMMON tristate "Common Driver for TI/National LP5521 and LP5523/55231" depends on LEDS_LP5521 || LEDS_LP5523 + select FW_LOADER help This option supports common operations for LP5521 and LP5523/55231 devices. -- cgit v1.2.2