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path: root/drivers/hwmon/pwm-fan.c
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2016-05-17hwmon: pwm-fan: Use pwm_get_args() where appropriateBoris Brezillon1-6/+20
The PWM framework has clarified the concept of reference PWM config (the platform dependent config retrieved from the DT or the PWM lookup table) and real PWM state. Use pwm_get_args() when the PWM user wants to retrieve this reference config and not the current state. This is part of the rework allowing the PWM framework to support hardware readout and expose real PWM state even when the PWM has just been requested (before the user calls pwm_config/enable/disable()). Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Acked-by: Kamil Debski <k.debski@samsung.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2015-09-20hwmon: (pwm-fan) Fix module autoload for OF platform driverLuis de Bethencourt1-0/+1
This platform driver has a OF device ID table but the OF module alias information is not created so module autoloading won't work. Signed-off-by: Luis de Bethencourt <luisbg@osg.samsung.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2015-04-12hwmon: (pwm-fan) Update the duty cycle inorder to control the pwm-fanAnand Moon1-6/+3
pwm_config() must be called with a duty cycle of 0 prior to calling pwm_disable() to ensure that the pwm signal is set to low. Reported-by: Markus Reichl <m.reichl@fivetechno.de> Tested-by: Markus Reichl <m.reichl@fivetechno.de> Reviewed-by: Lukasz Majewski <l.majewski@samsung.com> Reviewed-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk> Signed-off-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2015-03-16hwmon: (pwm-fan, vexpress) Constify of_device_id arrayFabian Frederick1-1/+1
of_device_id is always used as const. (See driver.of_match_table and open firmware functions) Signed-off-by: Fabian Frederick <fabf@skynet.be> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2015-03-09hwmon: (pwm-fan) Declare pwm_fan_of_get_cooling_data staticGuenter Roeck1-1/+2
Address the following sparse warnings. drivers/hwmon/pwm-fan.c:176:5: warning: symbol 'pwm_fan_of_get_cooling_data' was not declared. Should it be static? drivers/hwmon/pwm-fan.c:176:5: warning: no previous prototype for 'pwm_fan_of_get_cooling_data' pwm_fan_of_get_cooling_data is only used in the pwm-fan driver and thus should be declared static. Cc: Lukasz Majewski <l.majewski@samsung.com> Acked-by: Lukasz Majewski <l.majewski@samsung.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2015-03-09hwmon: (pwm-fan) Add support for using PWM FAN as a cooling deviceLukasz Majewski1-1/+88
The PWM FAN device can now be used as a thermal cooling device. Signed-off-by: Lukasz Majewski <l.majewski@samsung.com> Acked-by: Eduardo Valentin <edubezval@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2015-03-09hwmon: (pwm-fan) Read PWM FAN configuration from device treeLukasz Majewski1-1/+49
This patch provides code for reading PWM FAN configuration data via device tree. The pwm-fan can work with full speed when configuration is not provided. However, errors are propagated when wrong DT bindings are found. Additionally the struct pwm_fan_ctx has been extended. Signed-off-by: Lukasz Majewski <l.majewski@samsung.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2015-03-09hwmon: (pwm-fan) Extract __set_pwm() function to only modify PWM duty cycleLukasz Majewski1-12/+21
It was necessary to decouple code handling writing to sysfs from the one responsible for setting PWM of the fan. Due to that, new __set_pwm() method was extracted, which is responsible for only setting new PWM duty cycle. Signed-off-by: Lukasz Majewski <l.majewski@samsung.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2014-11-11hwmon: (pwm-fan) Fix suspend/resume behaviorKamil Debski1-3/+10
The state of a PWM output is not clearly defined after resume. Some PWM drivers do not restore the duty cycle upon resume, thus it is necessary to manually restore the correct value. Signed-off-by: Kamil Debski <k.debski@samsung.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2014-08-04hwmon: (pwm-fan) Remove duplicate dev_set_drvdata callAxel Lin1-1/+0
The dev_set_drvdata() call is equivalent to the platform_set_drvdata() call in next line. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2014-08-04hwmon: Add pwm-fan driverKamil Debski1-0/+194
The pwm-fan driver enables control of fans connected to PWM lines. This driver uses the PWM framework, so it is compatible with all PWM devices that provide drivers through the PWM framework. Signed-off-by: Kamil Debski <k.debski@samsung.com> Reviewed-by: Varka Bhadram <varkabhadram@gmail.com> Reviewed-by: Tobias Klauser <tklauser@distanz.ch> [Guenter Roeck: Last argument to devm_of_pwm_get is pointer, use NULL] Signed-off-by: Guenter Roeck <linux@roeck-us.net>