LP5521/5523 chip detection functions are replaced with lp55xx common function,
 lp55xx_detect_device().
 Chip dependent address and values are configurable in each driver.
 In init function, chip detection is executed.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <cooloney@gmail.com>

 LP5521/5523 reset device functions are moved to lp55xx common driver.
 Value of register address and value are chip dependent.
 Those are configured in each driver.
 In init function, reset command is executed.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <cooloney@gmail.com>

 LP5521/5523 platform data functions are moved to lp55xx common driver.
 New init function, lp55xx_init_device() is created.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <cooloney@gmail.com>

 This patch is a preceding step for making common lp55xx init function.

 Return code:
 Do not use 'OR' arithmetic for the result.
 If some error occurs, just return it.

 Remove engine verification code:
 To check whether internal engine works or not, many lines of code are executed.
 However, this job is unnecessary during the chip initialization because
 the engine usage is not mandatory but optional function.
 LED engines are enabled when specific LED pattern is loaded.
 Therefore, this verification code is removed.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <cooloney@gmail.com>

 LP5521 and LP5523 data structures have common features.
 Use common lp55xx data structures rather than chip specific data.
 Legacy code in probe is replaced with this new data structures.

 lp55xx_chip          : Common data between lp5521_chip and lp5523_chip
 lp55xx_led           : Common LED structure between lp5521_led and lp5523_led
 lp55xx_platform_data : Common platform data between lp5521_platform_data and
                        lp5523_platform_data
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <cooloney@gmail.com>

 Change the name of chip data structure and platform data.
 This patch is a preceding step for cleaning up lp5521/5523 probe and remove.
 These data will be replaced with new lp55xx common data structures
 in next patch.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <cooloney@gmail.com>

 Chip specific function is configured when the device is initialized.
 So _configure() is moved to each device init function.

 If chip configuration gets failed, the device is de-initialized in
 each _init_device(), not probe().

 For compile error fix, function type declarations are added.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <cooloney@gmail.com>

 Use explicit each driver function rather than raw command.
 These function will be merged into the lp55xx common driver.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <cooloney@gmail.com>

 To make LED unregistration code simple, new function, _unregister_leds()
 is added in each driver.
 This patch is a preceding step for lp55xx common driver architecture.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <cooloney@gmail.com>

 To make LED initialization code simple, new function, _register_leds()
 is added at each driver.
 This patch is a preceding step for lp55xx common driver architecture.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <cooloney@gmail.com>

 Device de-initialization code is moved to _deinit_device() at each driver.
 This patch is a preceding step for lp55xx common driver architecture.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <cooloney@gmail.com>

 To make _probe() simple, device initialization code is moved to
 _init_device() at each driver.
 This patch is a preceding step for lp55xx common driver architecture.

 leds-lp5521:
 When 'lp5521_init_device()' gets failed, error handling should be 'fail1'
 rather than 'fail2'.
   fail1: releasing platform resource and return code
   fail2: releasing allocated LED devices with handling 'fail1'
 The 'lp5521_init_device()' is called before creating LED devices.
 Thus, 'goto fail1' is proper error handler of this function.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <cooloney@gmail.com>

CONFIG_HOTPLUG is going away as an option so __devinit is no longer
needed.
Signed-off-by: NBill Pemberton <wfp5p@virginia.edu>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Jan-Simon Moeller <jansimon.moeller@gmx.de>
Acked-by: NBryan Wu <cooloney@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Return the value obtained from i2c_smbus_read_byte_data() instead of
-EIO. Silences the following smatch warning:
drivers/leds/leds-lp5523.c:174 lp5523_read() info:
why not propagate 'ret' from i2c_smbus_read_byte_data() instead of -5?
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NBryan Wu <cooloney@gmail.com>

The usage of strict_strtoul() is not preferred, because
strict_strtoul() is obsolete. Thus, kstrtoul() should be
used.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NBryan Wu <cooloney@gmail.com>

This patch fixes build warnings as below:

drivers/leds/leds-lp5523.c: In function 'lp5523_selftest':
drivers/leds/leds-lp5523.c:496:18: warning: 'adc' may be used uninitialized in this function [-Wuninitialized]
drivers/leds/leds-lp5523.c:471:5: warning: 'vdd' may be used uninitialized in this function [-Wuninitialized]
drivers/leds/leds-lp5523.c: In function 'lp5523_probe':
drivers/leds/leds-lp5523.c:252:9: warning: 'status' may be used uninitialized in this function [-Wuninitialized]
drivers/leds/leds-lp5523.c:201:5: note: 'status' was declared here

If lp5523_read() returns an error, problems will happen. Thus,
when lp5523_read() returns an error, it should be handled.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NBryan Wu <cooloney@gmail.com>

The last attribute should be terminated as NULL because any member of
attribute structure is accessed while adding the sysfs file.
If not, invalid address may cause the page fault problem.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <bryan.wu@canonical.com>

The LP5523 has 3 engines which are used for running LED patterns.
These engines should be off while unloading the driver.
Obviously, LP5523 platform data are used for releasing the resource
such like enable()/release_resource(), but these are not mandatory.
Therefore this patch is required without the platform data dependency.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <bryan.wu@canonical.com>

LP5523 driver supports both LP5523 and LP55231. The i2c device id
is one of the two - lp5523 or lp55231. So it's better to use
matching i2c device id while enumerating the device and naming LED
channels.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <bryan.wu@canonical.com>

To support LP55231 device, the device id is added. Additionally,
the i2c driver name is changed from lp5523 to lp5523x.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <bryan.wu@canonical.com>

(a) use LP5523_ENABLE rather than magic number 0x40
(b) use min_t() in lp5523_mux_parse()
(c) skip while loop and just return if invalid command
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <bryan.wu@canonical.com>

The return value of this function is not handled any place, so
make it as void type.

And three if-statements are replaced with switch-statements.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <bryan.wu@canonical.com>

Turning off the brightness of each channel is required
when removing the driver.

So use flush_work() rather than cancel_work_sync() to execute
remaining brightness works.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <bryan.wu@canonical.com>

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: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NBryan Wu <bryan.wu@canonical.com>

Cc: Mathias Nyman <mathias.nyman@nokia.com>
Signed-off-by: NBryan 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: NMatt Renzelmann <mjr@cs.wisc.edu>
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NBryan Wu <bryan.wu@canonical.com>

Saves ~50 bytes text and speeds things up.

Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Cc: Samu Onkalo <samu.p.onkalo@nokia.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Factor out some boilerplate code for i2c driver registration
into module_i2c_driver.
Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Cc: Haojian Zhuang <hzhuang1@marvell.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Michael Hennerich <hennerich@blackfin.uclinux.org>
Cc: Mike Rapoport <mike@compulab.co.il>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Fix this section mismatch:

  WARNING: drivers/leds/leds-lp5523.o(.text+0x12f4): Section mismatch in reference from the function lp5523_probe() to the function .init.text:lp5523_init_led()
  The function lp5523_probe() references
  the function __init lp5523_init_led().
  This is often because lp5523_probe lacks a __init
  annotation or the annotation of lp5523_init_led is wrong.

Fixing this one triggers one more mismatch, fix that one as well.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Don't allow everybody to change LED settings.
Signed-off-by: NVasiliy Kulikov <segoon@openwall.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Driver contained possibility for circular locking.

One lock is held by sysfs-core and another one by the driver itself.  This
happened when the driver created or removed sysfs entries dynamically.
There is no real need to do those operations.  Now all the sysfs entries
are created at probe and removed at removal.  Engine load and mux
configuration sysfs entries are now visible all the time.  However, access
to the entries fails if the engine is disabled or running.
Signed-off-by: NSamu Onkalo <samu.p.onkalo@nokia.com>
Cc: Arun Murthy <arun.murthy@stericsson.com>
Reviewed-by: NIlkka Koskinen <ilkka.koskinen@nokia.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Currently all leds channels begins with string lp5523.  Patch adds a
possibility to provide name via platform data.  This makes it possible to
have several chips without overlapping sysfs names.
Signed-off-by: NSamu Onkalo <samu.p.onkalo@nokia.com>
Cc: Arun Murthy <arun.murthy@stericsson.com>
Cc: Ilkka Koskinen <ilkka.koskinen@nokia.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Chip detection may fail if the chip is in some odd state for example after
system restart.  Chip doesn't have HW reset line.
Signed-off-by: NSamu Onkalo <samu.p.onkalo@nokia.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Delays were little bit too long.  Adjust delay times and add some comments
to them.
Signed-off-by: NSamu Onkalo <samu.p.onkalo@nokia.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

A small macro changed to inline function to have proper type checking.
Inline added to two similar small functions.
Signed-off-by: NSamu Onkalo <samu.p.onkalo@nokia.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

LP5523 chip is nine channel led driver with programmable engines.  Driver
provides support for that chip for direct access via led class or via
programmable engines.
Signed-off-by: NSamu Onkalo <samu.p.onkalo@nokia.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>