linux.git/drivers/leds, branch v3.5-rc2

leds: add LM3533 LED driver

2012-05-29T23:22:32+00:00

Add sub-driver for the LEDs on National Semiconductor / TI LM3533 lighting
power chips.

The chip provides 256 brightness levels, hardware accelerated blinking as
well as ambient-light-sensor and pwm input control.

Signed-off-by: Johan Hovold 
Cc: Richard Purdie 
Cc: Rob Landley 
Cc: Samuel Ortiz 
Cc: Jonathan Cameron 
Cc: Greg Kroah-Hartman 
Cc: Florian Tobias Schandinat 
Cc: Arnd Bergmann 
Cc: Mark Brown 
Cc: Bryan Wu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

drivers/leds/leds-pca955x.c: fix race condition while setting brightness on several LEDs

2012-05-29T23:22:32+00:00

When issuing the following command:

  for I in 0 1 2 3 4 5 6 7; do
    echo 0 > /sys/class/leds/pca955x\:${I}/brightness;
  done

It is possible that all the pca955x_read_ls calls are done sequentially
before any pca955x_write_ls call is done.  This updates the LS only to
the last LED update in its set.

Fix this by using a global lock for the pca995x device during
pca955x_led_work.  Also used a struct for shared data betreen all LEDs.

[akpm@linux-foundation.org: revert unintentional rename of pca955x_ledsel()]
Signed-off-by: Alexander Stein 
Cc: Richard Purdie 
Cc: Bryan Wu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

leds: add new transient trigger for one shot timer activation

2012-05-29T23:22:32+00:00

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

leds: heartbeat: stop on shutdown

2012-05-29T23:22:32+00:00

A halted kernel should not show a heartbeat.

[akpm@linux-foundation.org: checkpatch fixes]
Signed-off-by: Alexander Holler 
Cc: Shuah Khan 
Cc: Richard Purdie 
Cc: Bryan Wu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

drivers/leds/leds-lm3530.c: simplify als configuration on initialization

2012-05-29T23:22:32+00:00

For better code readability, ALS code is moved to new a function -
lm3530_als_configure()

Signed-off-by: Milo(Woogyom) Kim 
Acked-by: Linus Walleij 
Cc: Shreshtha Kumar SAHU 
Cc: Richard Purdie 
Cc: Bryan Wu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

leds: change ledtrig-timer to use activated flag

2012-05-29T23:22:31+00:00

Change existing timer trigger to use the new ->activated flag to set
activate successful status in activate routine and check it in deactivate
routine to do cleanup.

Signed-off-by: Shuah Khan 
Cc: Richard Purdie 
Cc: Bryan Wu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

leds: change existing triggers to use activated flag

2012-05-29T23:22:31+00:00

Change existing triggers backlight, gpio, and heartbeat to use the new
->activated flag to set activate successful status in their activate
routines and check it in their deactivate routines to do cleanup.

Signed-off-by: Shuah Khan 
Cc: Richard Purdie 
Cc: Bryan Wu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

leds: Use kcalloc instead of kzalloc to allocate array

2012-05-29T23:22:31+00:00

The advantage of kcalloc is that will prevent integer overflows which
could result from the multiplication of number of elements and size and it
is also a bit nicer to read.

The semantic patch that makes this change is available
in https://lkml.org/lkml/2011/11/25/107

Signed-off-by: Thomas Meyer 
Cc: Bryan Wu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

leds: simple_strtoul() cleanup

2012-05-29T23:22:31+00:00

led-class.c and ledtrig-timer.c still use simple_strtoul().  Change them
to use kstrtoul() instead of obsolete simple_strtoul().

Also fix the existing int ret declaration to be ssize_t to match the
return type for _store functions in ledtrig-timer.c.

Signed-off-by: Shuah Khan 
Cc: Joe Perches 
Cc: Richard Purdie 
Cc: Bryan Wu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

leds: driver for DA9052/53 PMIC v2

2012-05-29T23:22:31+00:00

LED Driver for Dialog Semiconductor DA9052/53 PMICs.

[akpm@linux-foundation.org: make led_reg static]
Signed-off-by: David Dajun Chen 
Signed-off-by: Ashish Jangam 
Reviewed-by: Lars-Peter Clausen 
Cc: Richard Purdie 
Cc: Bryan Wu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds