path: root/Documentation/leds
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2013-04-01leds: lp55xx: configure the clock detectionKim, Milo
Now LP55xx provides automatic clock detection API, lp55xx_is_extclk_used(). The clock configuration can be done by the driver itself. (a) Concept The default value is set by each driver with clock selection. The internal clock selection bit is updated in case that the external clock is not detected or clock rate is not 32KHz. (b) Change on LP55xx platform data The clock configuration is done automatically, so no need to define 'update_config' in the platform side. Correlated information are removed in the documentations and header. (c) Definitions moved from header to driver files CONFIG register values are moved each driver, LP5521 and LP5562. Not necessary definitions are removed also. Signed-off-by: Milo(Woogyom) Kim <> Signed-off-by: Bryan Wu <>
2013-04-01leds: add new LP5562 LED driverKim, Milo
LP5562 can drive up to 4 channels, RGB and White. LEDs can be controlled directly via the led class control interface. LP55xx common driver LP5562 is one of LP55xx family device, so LP55xx common code are used. On the other hand, chip specific configuration is defined in the structure 'lp55xx_device_config' LED pattern data LP5562 has also internal program memory which is used for running various LED patterns. LP5562 driver supports the firmware interface and the predefined pattern data as well. LP5562 device attributes: 'led_pattern' and 'engine_mux' A 'led_pattern' is an index code which runs the predefined pattern data. And 'engine_mux' is updated with the firmware interface is activated. Detailed description has been updated in the documentation files, 'leds-lp55xx.txt' and 'leds-lp5562.txt'. Changes on the header file LP5562 configurable definitions are added. Pattern RGB data is fixed as constant value. (No side effect on other devices, LP5521 or LP5523.) ( remove redundant mutex_unlock(). Reported by Dan Carpenter <>) Signed-off-by: Milo(Woogyom) Kim <> Signed-off-by: Bryan Wu <>
2013-02-06Documentation: leds: update LP55xx family devicesMilo(Woogyom) Kim
Update changed platform data information. Add leds-lp55xx.txt which includes the firmware interface description. Signed-off-by: Milo(Woogyom) Kim <> Signed-off-by: Bryan Wu <>
2012-09-11leds-lp5523: add channel name in the platform dataKim, Milo
The name of each led channel is configurable. If the name is NULL, just use the channel id for making the channel name Signed-off-by: Milo(Woogyom) Kim <> Signed-off-by: Bryan Wu <>
2012-07-24LEDS: add BlinkM RGB LED driver, documentation and update MAINTAINERSJan-Simon Möller
Add driver for BlinkM device to drivers/leds/. Add entry to MAINTAINERS file. Add documentation in Documentation/leds/. A BlinkM is a RGB LED controlled through I2C. This driver implements an interface to the LED framework and another sysfs group to access the internal options of the BlinkM. rev6: Use module_i2c_driver(). rev5: Removed own workqueue in favor of events wq. rev4: Fixed comments by Bryan Wu. rev3: Fixed issues found by Jonathan Neuschäfer. ( remove 2 trailing whitespace) Signed-off-by: Jan-Simon Möller <> Signed-off-by: Bryan Wu <>
2012-07-24leds: Add LED driver for lm3556 chipG.Shark Jeong
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: Tested on OMAP4430 ( use module_i2c_driver() rather than lm3556_init/lm3556_exit for code simplicity; fixed some typo pointed out by Rob Landley) Signed-off-by: G.Shark Jeong <> Reviewed-by: Axel Lin <> Reviewed-by: Kim, Milo <> Acked-by: Rob Landley <> Signed-off-by: Bryan Wu <>
2012-07-24leds: add oneshot triggerFabio Baltieri
Add oneshot trigger to blink a led with configurale parameters via sysfs. Signed-off-by: Fabio Baltieri <> Cc: Shuah Khan <> Signed-off-by: Bryan Wu <>
2012-05-29leds: add new transient trigger for one shot timer activationShuah Khan
The leds timer trigger does not currently have an interface to activate a one shot timer. The current support allows for setting two timers, one for specifying how long a state to be on, and the second for how long the state to be off. The delay_on value specifies the time period an LED should stay in on state, followed by a delay_off value that specifies how long the LED should stay in off state. The on and off cycle repeats until the trigger gets deactivated. There is no provision for one time activation to implement features that require an on or off state to be held just once and then stay in the original state forever. Without one shot timer interface, user space can still use timer trigger to set a timer to hold a state, however when user space application crashes or goes away without deactivating the timer, the hardware will be left in that state permanently. As a specific example of this use-case, let's look at vibrate feature on phones. Vibrate function on phones is implemented using PWM pins on SoC or PMIC. There is a need to activate one shot timer to control the vibrate feature, to prevent user space crashes leaving the phone in vibrate mode permanently causing the battery to drain. This trigger exports three properties, activate, state, and duration When transient trigger is activated these properties are set to default values. - duration allows setting timer value in msecs. The initial value is 0. - activate allows activating and deactivating the timer specified by duration as needed. The initial and default value is 0. This will allow duration to be set after trigger activation. - state allows user to specify a transient state to be held for the specified duration. Signed-off-by: Shuah Khan <> Cc: Jonas Bonn <> Cc: Richard Purdie <> Cc: NeilBrown <> Cc: Bryan Wu <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2012-03-23drivers/leds/leds-lp5521.c: support led pattern dataKim, Milo
The lp5521 has autonomous operation mode without external control. Using lp5521_platform_data, various led patterns can be configurable. For supporting this feature, new functions and device attribute are added. Structure of lp5521_led_pattern: 3 channels are supported - red, green and blue. Pattern(s) of each channel and numbers of pattern(s) are defined in the pla= tform data. Pattern data are hexa codes which include pattern commands such like set pwm, wait, ramp up/down, branch and so on. Pattern mode functions: * lp5521_clear_program_memory Before running new led pattern, program memory should be cleared. * lp5521_write_program_memory Pattern data updated in the program memory via the i2c. * lp5521_get_pattern Get pattern from predefined in the platform data. * lp5521_run_led_pattern Stop current pattern or run new pattern. Transition time is required between different operation mode. Device attribute - 'led_pattern': To load specific led pattern, new device attribute is added. When the lp5521 driver is unloaded, stop current led pattern mode. Documentation updated : description about how to define the led patterns and example. [ checkpatch fixes] Signed-off-by: Milo(Woogyom) Kim <> Acked-by: Linus Walleij <> Cc: Arun MURTHY <> Cc: Srinidhi Kasagar <> Cc: Richard Purdie <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2012-03-23drivers/leds/leds-lp5521.c: add 'update_config' in the lp5521_platform_dataKim, Milo
The value of CONFIG register(Addr 08h) is configurable. For supporting this feature, update_config is added in the platform data. If 'update_config' is not defined, the default value is 'LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT'. To define CONFIG register in the platform data, the bit definitions were mo= ved to the header file. Documentation updated : description about 'update_config' and example. Signed-off-by: Milo(Woogyom) Kim <> Acked-by: Linus Walleij <> Cc: Arun MURTHY <> Cc: Srinidhi Kasagar <> Cc: Richard Purdie <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2012-03-23drivers/leds/leds-lp5521.c: add 'name' in the lp5521_led_configKim, Milo
The name of each led channel can be configurable. For the compatibility, the name is set to default value(xx:channelN) when 'name' is not defined. Signed-off-by: Milo(Woogyom) Kim <> Acked-by: Linus Walleij <> Cc: Arun MURTHY <> Cc: Srinidhi Kasagar <> Cc: Richard Purdie <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2011-11-04Documentation: fix leds-class.txt duplicated wordBryan Wu
Fix a typo (duplicated word) in Documentation/leds/leds-class.txt Signed-off-by: Bryan Wu <> Acked-by: Richard Purdie <> Signed-off-by: Randy Dunlap <> Signed-off-by: Linus Torvalds <>
2011-04-04Documentation: consolidate leds files to leds/ subdirAntonio Ospite
leds: move leds-class documentation under the leds/ subdir. Add also a leds/00-INDEX file describing the files under leds/ Signed-off-by: Antonio Ospite <> Acked-by: Richard Purdie <> Cc: Andrew Morton <> Signed-off-by: Randy Dunlap <> Signed-off-by: Linus Torvalds <>
2010-11-12Documentation: led drivers lp5521 and lp5523Samu Onkalo
Create sub directory Documentation/leds and add short documentation for LP5521 and LP5523 drivers. Signed-off-by: Samu Onkalo <> Cc: Richard Purdie <> Cc: Jean Delvare <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>