linux.git/drivers/pwm/core.c, branch v4.6.3

pwm: Mark all devices as "might sleep"

2016-01-21T14:04:59+00:00

Commit d1cd21427747 ("pwm: Set enable state properly on failed call to
enable") introduced a mutex that is needed to protect internal state of
PWM devices. Since that mutex is acquired in pwm_set_polarity() and in
pwm_enable() and might potentially block, all PWM devices effectively
become "might sleep".

It's rather pointless to keep the .can_sleep field around, but given
that there are external users let's postpone the removal for the next
release cycle.

Signed-off-by: Thierry Reding

pwm: Return -ENODEV if no PWM lookup match is found

2015-11-10T12:06:42+00:00

When looking up a PWM using the lookup table, assume that all entries
will have been added already, so failure to find a match means that no
corresponding entry has been registered.

This fixes an issue where -EPROBE_DEFER would be returned if the PWM
lookup table is empty. After this fix, -EPROBE_DEFER is reserved for
situations where no provider has yet registered for a matching entry.

Signed-off-by: Thierry Reding

pwm: Set enable state properly on failed call to enable

2015-11-10T12:06:16+00:00

The pwm_enable() function didn't clear the enabled bit if a call to the
driver's ->enable() callback returned an error. The result was that the
state of the PWM core was wrong. Clearing the bit when enable returns
an error ensures the state is properly set.

Tested-by: Jonathan Richardson 
Reviewed-by: Dmitry Torokhov 
Signed-off-by: Jonathan Richardson 
[thierry.reding@gmail.com: add missing kerneldoc for the lock]
Signed-off-by: Thierry Reding

pwm: Clean up kerneldoc

2015-08-17T13:40:20+00:00

Clean up kerneldoc in preparation for including the PWM documentation in
DocBook.

Signed-off-by: Thierry Reding

pwm: Remove useless whitespace

2015-08-17T13:40:19+00:00

Remove useless tabs used for padding in structure definitions as well as
some blank lines.

Signed-off-by: Thierry Reding

pwm: Add the pwm_is_enabled() helper

2015-07-20T07:46:06+00:00

Some PWM drivers are testing the PWMF_ENABLED flag. Create a helper
function to hide the logic behind enabled test. This will allow us to
smoothly move from the current approach to an atomic PWM update
approach.

Signed-off-by: Boris Brezillon 
Signed-off-by: Thierry Reding

pwm: Add pwmchip_add_with_polarity() API

2015-06-12T09:36:30+00:00

Add a new function to register a PWM chip with channels that have their
initial polarity as specified by an additional parameter. This benefits
drivers of controllers that by default operate with inversed polarity
by removing the need to modify the polarity during initialization.

Signed-off-by: Tim Kryger 
Signed-off-by: Jonathan Richardson 
[thierry.reding@gmail.com: export pwmchip_add_with_polarity()]
Signed-off-by: Thierry Reding

pwm: Add support to remove registered consumer lookup tables

2015-05-06T12:19:35+00:00

In case some drivers are unloading, they can remove lookup tables which
they had registered during their load time to avoid redundant entries if
loaded again.

CC: Samuel Ortiz 
Cc: Linus Walleij 
Cc: Alexandre Courbot 
Cc: Thierry Reding 
Signed-off-by: Shobhit Kumar 
Signed-off-by: Thierry Reding

pwm: Remove __init initializer for pwm_add_table()

2015-04-23T12:50:52+00:00

For platforms that don't support DT, some early MFD modules can register
lookup tables. Remove the __init annotation so that this works. This is
similar to gpio_add_lookup_table() which allows late additions.

CC: Samuel Ortiz 
Cc: Linus Walleij 
Cc: Alexandre Courbot 
Cc: Thierry Reding 
Signed-off-by: Shobhit Kumar 
Signed-off-by: Thierry Reding

pwm: Remove unnecessary check before of_node_put()

2015-02-03T11:56:54+00:00

The of_node_put() function tests whether its argument is NULL and then
returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring 
Signed-off-by: Thierry Reding