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-Kernel driver for lp5521
-========================
-
-* National Semiconductor LP5521 led driver chip
-* Datasheet: http://www.national.com/pf/LP/LP5521.html
-
-Authors: Mathias Nyman, Yuri Zaporozhets, Samu Onkalo
-Contact: Samu Onkalo (samu.p.onkalo-at-nokia.com)
-
-Description
------------
-
-LP5521 can drive up to 3 channels. Leds can be controlled directly via
-the led class control interface. Channels have generic names:
-lp5521:channelx, where x is 0 .. 2
-
-All three channels can be also controlled using the engine micro programs.
-More details of the instructions can be found from the public data sheet.
-
-LP5521 has the internal program memory for running various LED patterns.
-There are two ways to run LED patterns.
-
-1) Legacy interface - enginex_mode and enginex_load
-  Control interface for the engines:
-  x is 1 .. 3
-  enginex_mode : disabled, load, run
-  enginex_load : store program (visible only in engine load mode)
-
-  Example (start to blink the channel 2 led):
-  cd   /sys/class/leds/lp5521:channel2/device
-  echo "load" > engine3_mode
-  echo "037f4d0003ff6000" > engine3_load
-  echo "run" > engine3_mode
-
-  To stop the engine:
-  echo "disabled" > engine3_mode
-
-2) Firmware interface - LP55xx common interface
-  For the details, please refer to 'firmware' section in leds-lp55xx.txt
-
-sysfs contains a selftest entry.
-The test communicates with the chip and checks that
-the clock mode is automatically set to the requested one.
-
-Each channel has its own led current settings.
-/sys/class/leds/lp5521:channel0/led_current - RW
-/sys/class/leds/lp5521:channel0/max_current - RO
-Format: 10x mA i.e 10 means 1.0 mA
-
-example platform data:
-
-Note: chan_nr can have values between 0 and 2.
-The name of each channel can be configurable.
-If the name field is not defined, the default name will be set to 'xxxx:channelN'
-(XXXX : pdata->label or i2c client name, N : channel number)
-
-static struct lp55xx_led_config lp5521_led_config[] = {
-        {
-		.name = "red",
-                .chan_nr        = 0,
-                .led_current    = 50,
-		.max_current    = 130,
-        }, {
-		.name = "green",
-                .chan_nr        = 1,
-                .led_current    = 0,
-		.max_current    = 130,
-        }, {
-		.name = "blue",
-                .chan_nr        = 2,
-                .led_current    = 0,
-		.max_current    = 130,
-        }
-};
-
-static int lp5521_setup(void)
-{
-	/* setup HW resources */
-}
-
-static void lp5521_release(void)
-{
-	/* Release HW resources */
-}
-
-static void lp5521_enable(bool state)
-{
-	/* Control of chip enable signal */
-}
-
-static struct lp55xx_platform_data lp5521_platform_data = {
-        .led_config     = lp5521_led_config,
-        .num_channels   = ARRAY_SIZE(lp5521_led_config),
-        .clock_mode     = LP55XX_CLOCK_EXT,
-        .setup_resources   = lp5521_setup,
-        .release_resources = lp5521_release,
-        .enable            = lp5521_enable,
-};
-
-If the current is set to 0 in the platform data, that channel is
-disabled and it is not visible in the sysfs.