On Wed, Jun 20, 2012 at 1:27 PM, G.Shark Jeong <gshark.jeong@xxxxxxxxx> wrote: > From: "G.Shark Jeong" <gshark.jeong@xxxxxxxxx> > > LM3556 : > The LM3556 is a 4 MHz fixed-frequency synchronous boost > converter plus 1.5A constant current driver for a high-current white LED. > Datasheet: www.national.com/ds/LM/LM3556.pdf > > Signed-off-by: G.Shark Jeong <gshark.jeong@xxxxxxxxx> Apparently, this patch has some coding style issue. And please fold this patch with your previous driver patch together and send out as a whole patch then. Thanks, -Bryan > --- > Documentation/leds/00-INDEX | 2 + > Documentation/leds/leds-lm3556.txt | 86 ++++++++++++++++++++++++++++++++++++ > 2 files changed, 88 insertions(+), 0 deletions(-) > create mode 100644 Documentation/leds/leds-lm3556.txt > > diff --git a/Documentation/leds/00-INDEX b/Documentation/leds/00-INDEX > index 29f481d..5fefe37 100644 > --- a/Documentation/leds/00-INDEX > +++ b/Documentation/leds/00-INDEX > @@ -6,3 +6,5 @@ leds-lp5521.txt > - notes on how to use the leds-lp5521 driver. > leds-lp5523.txt > - notes on how to use the leds-lp5523 driver. > +leds-lm3556.txt > + - notes on how to use the leds-lm3556 driver. > diff --git a/Documentation/leds/leds-lm3556.txt b/Documentation/leds/leds-lm3556.txt > new file mode 100644 > index 0000000..debdf87 > --- /dev/null > +++ b/Documentation/leds/leds-lm3556.txt > @@ -0,0 +1,86 @@ > +Kernel driver for lm3556 > +======================== > + > +*Texas Instrument: > + 1.5 A Synchronous Boost LED Flash Driver w/ High-Side Current Source > +* Datasheet: http://www.national.com/ds/LM/LM3556.pdf > + > +Authors: > + Daniel Jeong > + Contact:Daniel Jeong(daniel.jeong-at-ti.com, gshark.jeong-at-gmail.com) > + > +Description > +----------- > +There are 3 functions in LM3556, Flash, Torch and Indicator. > + > +FLASH MODE > +In Flash Mode, the LED current source(LED) provides 16 target current levels > +from 93.75 mA to 1500 mA.The Flash currents are adjusted via the CURRENT > +CONTROL REGISTER(0x09).Flash mode is activated by the ENABLE REGISTER(0x0A), > +or by pulling the STROBE pin HIGH. > +LM3556 Flash can be controlled through sys/class/leds/flash/brightness file > +* if STROBE pin is enabled, below example control brightness only, and > +ON / OFF will be controlled by STROBE pin. > + > +Flash Example: > +OFF : #echo 0 > sys/class/leds/flash/brightness > +93.75 mA: #echo 1 > sys/class/leds/flash/brightness > +... ..... > +1500 mA: #echo 16 > sys/class/leds/flash/brightness > + > +TORCH MODE > +In Torch Mode, the current source(LED) is programmed via the CURRENT CONTROL > +REGISTER(0x09).Torch Mode is activated by the ENABLE REGISTER(0x0A) or by the > +hardware TORCH input. > +LM3556 torch can be controlled through sys/class/leds/torch/brightness file. > +* if TORCH pin is enabled, below example control brightness only, > +and ON / OFF will be controlled by TORCH pin. > + > +Torch Example: > +OFF : #echo 0 > sys/class/leds/torch/brightness > +46.88 mA: #echo 1 > sys/class/leds/torch/brightness > +... ..... > +375 mA : #echo 8 > sys/class/leds/torch/brightness > + > +INDICATOR MODE > +Indicater pattern can be set through sys/class/leds/indicator/pattern file, > +and 4 patterns are pre-defined in indicator_pattern array. > +According to N-lank, Pulse time and N Period values, different pattern wiill > +be generated.If you want new patterns for your own device, change > +indicator_pattern array with your own values and INDIC_PATTERN_SIZE. > +Please refer datasheet for more detail about N-Blank, Pulse time and N Period. > + > +Indicator pattern example: > +pattern 0: #echo 0 > sys/class/leds/indicator/pattern > +.... > +pattern 3: #echo 3 > sys/class/leds/indicator/pattern > + > +Indicater brightness can be controlled through > +sys/class/leds/indicator/brightness file. > + > +Example: > +OFF : #echo 0 > sys/class/leds/indicator/brightness > +5.86 mA : #echo 1 > sys/class/leds/indicator/brightness > +........ > +46.875mA : #echo 8 > sys/class/leds/indicator/brightness > + > +Notes > +----- > +Driver expects it is registered using the i2c_board_info mechanism. > +Toregister the chip at address 0x63 on specific adapter, set the platform data > + according to include/linux/platform_data/leds-lm3556.h, set the i2c board info: > + > +Example: > + static struct i2c_board_info __initdata board_i2c_ch4[] = { > + { > + I2C_BOARD_INFO(LM3556_NAME, 0x63), > + .platform_data = &lm3556_pdata, > + }, > + }; > + > +and register it in the platform init function > + > +Example: > + board_register_i2c_bus(4, 400, > + board_i2c_ch4, ARRAY_SIZE(board_i2c_ch4)); > + > -- > 1.7.5.4 > -- Bryan Wu <bryan.wu@xxxxxxxxxxxxx> Kernel Developer +86.186-168-78255 Mobile Canonical Ltd. www.canonical.com Ubuntu - Linux for human beings | www.ubuntu.com -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
