linux-kernel - Re: [PATCH v6 11/14] platform/x86: oxpec: Adhere to sysfs-class-hwmon and enable pwm on 2

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Message-ID: 
 <CAGwozwEQivC-uDnZQ5ZRR7zKEVQkcFaVs3MgJXTiN_RMzF_MSQ@mail.gmail.com>
Date: Sat, 22 Mar 2025 09:31:40 +0100
From: Antheas Kapenekakis <lkml@...heas.dev>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: platform-driver-x86@...r.kernel.org, linux-hwmon@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-pm@...r.kernel.org,
	Guenter Roeck <linux@...ck-us.net>, Jean Delvare <jdelvare@...e.com>,
 Jonathan Corbet <corbet@....net>,
	Joaquin Ignacio Aramendia <samsagax@...il.com>,
 Derek J Clark <derekjohn.clark@...il.com>,
	Kevin Greenberg <kdgreenberg234@...tonmail.com>,
 Joshua Tam <csinaction@...me>,
	Parth Menon <parthasarathymenon@...il.com>, Eileen <eileen@...-netbook.com>,
	linux-kernel@...r.kernel.org, sre@...nel.org, ilpo.jarvinen@...ux.intel.com,
	hdegoede@...hat.com, mario.limonciello@....com
Subject: Re: [PATCH v6 11/14] platform/x86: oxpec: Adhere to sysfs-class-hwmon
 and enable pwm on 2

On Sat, 22 Mar 2025 at 09:24, Thomas Weißschuh <linux@...ssschuh.net> wrote:
>
> On 2025-03-19 18:55:06+0100, Antheas Kapenekakis wrote:
> > Currently, the driver does not adhere to the sysfs-class-hwmon
> > specification: 0 is used for auto fan control and 1 is used for manual
> > control. However, it is expected that 0 sets the fan to full speed,
> > 1 sets the fan to manual, and then 2 is used for automatic control.
> >
> > Therefore, change the sysfs API to reflect this and enable pwm on 2.
> >
> > As we are breaking the ABI for this driver, rename oxpec to oxp_ec,
> > reflecting the naming convention used by other drivers, to allow for
> > a smooth migration in current userspace programs.
>
> Where is the renaming being done?

Good catch thomas. When I did the battery rebase after v4 [1], it
seems to have moved from this patch to the battery patch [2]

Antheas

[1] https://lore.kernel.org/all/20250311165406.331046-13-lkml@antheas.dev/
[2] https://lore.kernel.org/all/20250319181044.392235-15-lkml@antheas.dev/

> > Closes: https://lore.kernel.org/linux-hwmon/20241027174836.8588-1-derekjohn.clark@gmail.com/
> > Reviewed-by: Derek J. Clark <derekjohn.clark@...il.com>
> > Signed-off-by: Antheas Kapenekakis <lkml@...heas.dev>
> > ---
> >  drivers/platform/x86/oxpec.c | 35 ++++++++++++++++++++++++++++++++---
> >  1 file changed, 32 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/platform/x86/oxpec.c b/drivers/platform/x86/oxpec.c
> > index e84afc5f53379..680fa537babf6 100644
> > --- a/drivers/platform/x86/oxpec.c
> > +++ b/drivers/platform/x86/oxpec.c
> > @@ -731,7 +731,27 @@ static int oxp_platform_read(struct device *dev, enum hwmon_sensor_types type,
> >               case hwmon_pwm_input:
> >                       return oxp_pwm_input_read(val);
> >               case hwmon_pwm_enable:
> > -                     return oxp_pwm_read(val);
> > +                     ret = oxp_pwm_read(val);
> > +                     if (ret)
> > +                             return ret;
> > +
> > +                     /* Check for auto and return 2 */
> > +                     if (!*val) {
> > +                             *val = 2;
> > +                             return 0;
> > +                     }
> > +
> > +                     /* Return 0 if at full fan speed, 1 otherwise */
> > +                     ret = oxp_pwm_fan_speed(val);
> > +                     if (ret)
> > +                             return ret;
> > +
> > +                     if (*val == 255)
> > +                             *val = 0;
> > +                     else
> > +                             *val = 1;
> > +
> > +                     return 0;
> >               default:
> >                       break;
> >               }
> > @@ -745,15 +765,24 @@ static int oxp_platform_read(struct device *dev, enum hwmon_sensor_types type,
> >  static int oxp_platform_write(struct device *dev, enum hwmon_sensor_types type,
> >                             u32 attr, int channel, long val)
> >  {
> > +     int ret;
> > +
> >       switch (type) {
> >       case hwmon_pwm:
> >               switch (attr) {
> >               case hwmon_pwm_enable:
> >                       if (val == 1)
> >                               return oxp_pwm_enable();
> > -                     else if (val == 0)
> > +                     else if (val == 2)
> >                               return oxp_pwm_disable();
> > -                     return -EINVAL;
> > +                     else if (val != 0)
> > +                             return -EINVAL;
> > +
> > +                     /* Enable PWM and set to max speed */
> > +                     ret = oxp_pwm_enable();
> > +                     if (ret)
> > +                             return ret;
> > +                     return oxp_pwm_input_write(255);
> >               case hwmon_pwm_input:
> >                       return oxp_pwm_input_write(val);
> >               default:
> > --
> > 2.48.1
> >