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-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
-Indicator 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
-
-Indicator 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.
-To register 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 board_i2c_ch4[] __initdata = {
-		{
-			 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));