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.

(bryan.wu@canonical.com: remove 2 trailing whitespace)
Signed-off-by: Jan-Simon Möller <jansimon.moeller@gmx.de>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

It is not necessary to call max8997_update_reg() twice just for updating
MAX8997_REG_LEN_CNTL register. With proper val and mask arguments to
max8997_update_reg() call, this can be done in one max8997_update_reg() call.
And then we can remove max8997_led_clear_mode() function.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

why?
because if the led_classdev_register fails we wont do gpio free
because using devm_ functions, there is no need for error paths
Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Simon Guinot <sguinot@lacie.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Guennadi Liakhovetski <lg@denx.de>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Philippe Retornaz <philippe.retornaz@epfl.ch>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Michael Hennerich <hennerich@blackfin.uclinux.org>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Nate Case <ncase@xes-inc.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Riku Voipio <riku.voipio@iki.fi>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Magnus Damm <damm@opensource.se>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Mathias Nyman <mathias.nyman@nokia.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Peter Meerwald <p.meerwald@bct-electronic.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Kim Kyuwon <q1.kim@samsung.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Eric Miao <eric.miao@canonical.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Antonio Ospite <ospite@studenti.unina.it>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Paul Parsons <lost.distance@yahoo.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Cc: Simon Guinot <sguinot@lacie.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

devm_kzalloc() makes cleanup simpler.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

devm_kzalloc() makes code cleanup simpler.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

devm_kzalloc() makes cleanup simpler.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

devm_kzalloc() makes cleanup simpler.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

module_platform_driver() makes the code simpler.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Signed-off-by: Peter Meerwald <p.meerwald@bct-electronic.com>
Cc: NeilBrown <neilb@suse.de>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

The s3c2410_gpio* calls are obsolete and have been scheduled for
removal since several kernel releases. Remove them and use common
gpiolib API instead.
This patch also adds gpio_request/gpio_free call for API corectness.

It is a prerequisite for removal of the S3C24XX SoC specific
arch/arm/plat-samsung/include/gpio-fns.h header.

Tested on Micro2440-SDK.

Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Use the device managed resource API for simplifying
the error/driver remove paths.

Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

the platform_set_drvdata (pdev, NULL) to be set at the remove of the
driver, as we have set the platform data to led at probe.
Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Using devm_kzalloc will remove all the error checks and the frees are automatically done at the driver unload side.
Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Inside the error handling in lp5523_init_led(), there is a place that
calls to led_classdev_unregister().  When we unregister the LED drivers,
it tries to set the brightness to OFF.  In this driver setting the
brightness is done through a work queue and the work queue hasn't been
initialized yet.

The result is that we trigger a WARN_ON() in the __queue_work().

The fix is to move the INIT_WORK() in front of the call to
lp5523_init_led().

Matt Renzelmann found this using a bug finding tool.
Reported-by: Matt Renzelmann <mjr@cs.wisc.edu>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

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

Tested on OMAP4430

(bryan.wu@canonical.com: 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 <gshark.jeong@gmail.com>
Reviewed-by: Axel Lin <axel.lin@gmail.com>
Reviewed-by: Kim, Milo <Milo.Kim@ti.com>
Acked-by: Rob Landley <rob@landley.net>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

the ret is got the status returned by the
led_classdev_register, returning ret if the
led_classdev_register fails and returning 0
if the led_classdev_register success, can be done
by doing just "return ret" at the end.
Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

drivers/leds/led-core.c:56:6: sparse: symbol 'led_blink_setup' was not declared. Should it be static?
drivers/leds/led-triggers.c:233:6: sparse: symbol 'led_trigger_blink_setup' was not declared. Should it be static?
Reported-by: Fengguang Wu <wfg@linux.intel.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Correct "hadrware" to "hardware", for LEDS_TRIGGER_TRANSIENT.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Fix led_trigger_event() to use led_set_brightness() instead of
__led_set_brightness(), so that any pending blink timer is stopped before
setting the new brightness value.  Without this fix LED status may be
overridden by a pending timer.

This allows a trigger to use a mix of led_trigger_event(),
led_trigger_blink() and led_trigger_blink_oneshot() without races.

(applied over: leds: Rename led_brightness_set() to led_set_brightness())
Signed-off-by: Fabio Baltieri <fabio.baltieri@gmail.com>
Cc: Shuah Khan <shuahkhan@gmail.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

Rename leds external interface led_brightness_set() to led_set_brightness().
This is the second phase of the change to reduce confusion between the
leds internal and external interfaces that set brightness. With this change,
now the external interface is led_set_brightness(). The first phase renamed
the internal interface led_set_brightness() to __led_set_brightness().
There are no changes to the interface implementations.
Signed-off-by: Shuah Khan <shuahkhan@gmail.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>