Editing N900 Hardware LED
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==Hardware== | ==Hardware== | ||
- | The [[Nokia N900|N900]] has LP5523 <ref name="lp5523-spec">http://www.national.com/pf/LP/LP5523.html</ref> <ref name="leds-lp5523-driver">http://mxr.maemo.org/fremantle/source/kernel/drivers/leds/leds-lp5523.c</ref>, which has 3 engines like LP5521 | + | The [[Nokia N900|N900]] has a LP5521<ref name="lp5521-spec">http://www.national.com/pf/LP/LP5521.html</ref> <ref name="lp5521-driver">http://mxr.maemo.org/fremantle/source/kernel/drivers/i2c/chips/lp5521.c</ref> programmable three channel controller LED Driver which handles the keyboard and notification LED. (not the [[N900 Hardware Flash Torch|flash LEDs]] and red indicator light next to those, and also not the Infrared-LED used for CIR) |
+ | (actually it has a LP5523 <ref name="lp5523-spec">http://www.national.com/pf/LP/LP5523.html</ref> <ref name="leds-lp5523-driver">http://mxr.maemo.org/fremantle/source/kernel/drivers/leds/leds-lp5523.c</ref>, which has 3 engines like LP5521 but can drive 9 LEDs via a multiplexer which maps each LED to one of the 3 engines. A LED also can be unassigned to any engine, in which case you can control it by writing to the corresponding brightness sysnode) | ||
- | The controller can be programmed via "/sys/class/i2c-adapter/i2c-2/2-0032". In that directory there are three files corresponding to the three channels: | + | The controller can be programmed via "/sys/class/i2c-adapter/i2c-2/2-0032" (FIXME: is this stable?). In that directory there are three files corresponding to the three channels: engine1_mode, engine2_mode and engine3_mode. Each file "stores" one of "run", "load", "disabled" (it seems that there is another mode "direct" but it doesn't work): |
- | * | + | * run: The program runs |
- | * | + | * disabled: The channel is disabled - not running |
- | * | + | * load: In that state, there are two more files in that directory: |
- | ** engine1_LEDs is in the form " | + | ** engine1_LEDs is in the form "0000rgb00" (9 digits, "1" or "0"), where rgb control which LEDs should participate. The 6 "0" in the above pattern correspond to the 6 kbd white LEDs controlled by MCE via engine3, so readout of engine3_leds gives 111100011 ;-) |
- | ** engine1_load accepts a string as specified above (e.g. 9d804000427f0d7f7f007f0042000000). LP5523 has an absolute storage of 96 steps a 16bits, which can dynamically partitioned between the three engines. ( | + | ** engine1_load accepts a string as specified above (e.g. 9d804000427f0d7f7f007f0042000000). LP5523 has an absolute storage of 96 steps a 16bits, which can dynamically partitioned between the three engines. (ToDo: check if driver supports >16 instructions / machine) |
After that, when the state is changed to "run", the program will be ran by the controller. | After that, when the state is changed to "run", the program will be ran by the controller. | ||
- | In order for the LEDs to work, the led_current of the appropriate LEDs need to be set to non-zero values. This is accomplished by writing to files LEDs:lp5523:[bgr]/led_current under the same directory. | + | In order for the LEDs to work, the led_current of the appropriate LEDs need to be set to non-zero values. This is accomplished by writing to files LEDs:lp5523:[bgr]/led_current under the same directory. Perhaps (?) not or values are suitable. |
- | + | NOTE: There must be a delay (how much? The specs of LP5521 mentions it) between writes to sysfs files. | |
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==Software== | ==Software== | ||
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== References == | == References == | ||
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<references /> | <references /> | ||
[[Category:N900 Hardware]] | [[Category:N900 Hardware]] |
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