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[v3,0/4] cros_kbd_led_backlight: allow binding through cros_ec mfd device

Message ID 20240526-cros_ec-kbd-led-framework-v3-0-ee577415a521@weissschuh.net (mailing list archive)
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Series cros_kbd_led_backlight: allow binding through cros_ec mfd device | expand

Message

Thomas Weißschuh May 26, 2024, 6:17 p.m. UTC
Extend the cros_ec MFD device to also load cros_kbd_led_backlight
when the EC reports EC_FEATURE_PWM_KEYB.
As the driver can now be probed multiple times, some preparation in the
LED core is necessary to avoid name collisions.

Patch 1 is a general cleanup for the LED core.
Patch 2 modifies the LED core to skip the default collision handling.
Patch 3 adds the new probing logic to cros_kbd_led_backlight.
Patch 4 wires up the driver to the cros_ec mfd devices.

The helper keyboard_led_is_mfd_device is a bit iffy.
But using match data doesn't work.

* driver_data from platform_device_id is overwritten by the mfd platform data
* Setting the driver_data in drivers/mfd/cros_ec_dev.c would expose the
internals of cros_kbd_led_backlight

Tested on a Framework 13 AMD, Firmware 3.05, and a Jinlon Chromebook.

To: Lee Jones <lee@kernel.org>
To: Benson Leung <bleung@chromium.org>
To: Guenter Roeck <groeck@chromium.org>
To: Tzung-Bi Shih <tzungbi@kernel.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: chrome-platform@lists.linux.dev
Cc: linux-kernel@vger.kernel.org
Cc: Dustin Howett <dustin@howett.net>
Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: linux-leds@vger.kernel.org
Cc: Rajas Paranjpe <paranjperajas@gmail.com>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

Changes in v3:
- Avoid probing multiple times (Confirmed by Rajas)
- Add Kconfig dependency on MFD_CROS_EC_DEV
- Link to v2: https://lore.kernel.org/r/20240511-cros_ec-kbd-led-framework-v2-0-b20c48109e46@weissschuh.net

Changes in v2:
- Fix build with CONFIG_MFD_CROS_EC_DEV=n (kernel test robot)
- Split out mfd registration into own commit (Lee)
- Simplify keyboard_led_is_mfd_device() with mfd_get_cell()
- Link to v1: https://lore.kernel.org/r/20240505-cros_ec-kbd-led-framework-v1-1-bfcca69013d2@weissschuh.net

---
Thomas Weißschuh (4):
      leds: class: warn about name collisions earlier
      leds: add flag to avoid automatic renaming of led devices
      platform/chrome: cros_kbd_led_backlight: allow binding through mfd device
      mfd: cros_ec: Register keyboard backlight subdevice

 drivers/leds/led-class.c                         |  9 +++---
 drivers/mfd/cros_ec_dev.c                        |  9 ++++++
 drivers/platform/chrome/Kconfig                  |  2 +-
 drivers/platform/chrome/cros_kbd_led_backlight.c | 40 ++++++++++++++++++++++--
 include/linux/leds.h                             |  1 +
 5 files changed, 54 insertions(+), 7 deletions(-)
---
base-commit: 6fbf71854e2ddea7c99397772fbbb3783bfe15b5
change-id: 20240505-cros_ec-kbd-led-framework-7e2e831bc79c

Best regards,

Comments

Lee Jones May 31, 2024, 3:35 p.m. UTC | #1
On Sun, 26 May 2024, Thomas Weißschuh wrote:

> Extend the cros_ec MFD device to also load cros_kbd_led_backlight
> when the EC reports EC_FEATURE_PWM_KEYB.
> As the driver can now be probed multiple times, some preparation in the
> LED core is necessary to avoid name collisions.
> 
> Patch 1 is a general cleanup for the LED core.
> Patch 2 modifies the LED core to skip the default collision handling.
> Patch 3 adds the new probing logic to cros_kbd_led_backlight.
> Patch 4 wires up the driver to the cros_ec mfd devices.
> 
> The helper keyboard_led_is_mfd_device is a bit iffy.
> But using match data doesn't work.
> 
> * driver_data from platform_device_id is overwritten by the mfd platform data
> * Setting the driver_data in drivers/mfd/cros_ec_dev.c would expose the
> internals of cros_kbd_led_backlight
> 
> Tested on a Framework 13 AMD, Firmware 3.05, and a Jinlon Chromebook.
> 
> To: Lee Jones <lee@kernel.org>
> To: Benson Leung <bleung@chromium.org>
> To: Guenter Roeck <groeck@chromium.org>
> To: Tzung-Bi Shih <tzungbi@kernel.org>
> To: Pavel Machek <pavel@ucw.cz>
> Cc: chrome-platform@lists.linux.dev
> Cc: linux-kernel@vger.kernel.org
> Cc: Dustin Howett <dustin@howett.net>
> Cc: Mario Limonciello <mario.limonciello@amd.com>
> Cc: linux-leds@vger.kernel.org
> Cc: Rajas Paranjpe <paranjperajas@gmail.com>
> Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
> 
> Changes in v3:
> - Avoid probing multiple times (Confirmed by Rajas)
> - Add Kconfig dependency on MFD_CROS_EC_DEV
> - Link to v2: https://lore.kernel.org/r/20240511-cros_ec-kbd-led-framework-v2-0-b20c48109e46@weissschuh.net
> 
> Changes in v2:
> - Fix build with CONFIG_MFD_CROS_EC_DEV=n (kernel test robot)
> - Split out mfd registration into own commit (Lee)
> - Simplify keyboard_led_is_mfd_device() with mfd_get_cell()
> - Link to v1: https://lore.kernel.org/r/20240505-cros_ec-kbd-led-framework-v1-1-bfcca69013d2@weissschuh.net
> 
> ---
> Thomas Weißschuh (4):
>       leds: class: warn about name collisions earlier
>       leds: add flag to avoid automatic renaming of led devices
>       platform/chrome: cros_kbd_led_backlight: allow binding through mfd device
>       mfd: cros_ec: Register keyboard backlight subdevice
> 
>  drivers/leds/led-class.c                         |  9 +++---
>  drivers/mfd/cros_ec_dev.c                        |  9 ++++++
>  drivers/platform/chrome/Kconfig                  |  2 +-
>  drivers/platform/chrome/cros_kbd_led_backlight.c | 40 ++++++++++++++++++++++--
>  include/linux/leds.h                             |  1 +
>  5 files changed, 54 insertions(+), 7 deletions(-)

Looks okay.

Does the platform patch need to be applied with the others?
Thomas Weißschuh May 31, 2024, 3:49 p.m. UTC | #2
On 2024-05-31 16:35:30+0000, Lee Jones wrote:
> On Sun, 26 May 2024, Thomas Weißschuh wrote:
> 
> > Extend the cros_ec MFD device to also load cros_kbd_led_backlight
> > when the EC reports EC_FEATURE_PWM_KEYB.
> > As the driver can now be probed multiple times, some preparation in the
> > LED core is necessary to avoid name collisions.
> > 
> > Patch 1 is a general cleanup for the LED core.
> > Patch 2 modifies the LED core to skip the default collision handling.
> > Patch 3 adds the new probing logic to cros_kbd_led_backlight.
> > Patch 4 wires up the driver to the cros_ec mfd devices.
> > 
> > The helper keyboard_led_is_mfd_device is a bit iffy.
> > But using match data doesn't work.
> > 
> > * driver_data from platform_device_id is overwritten by the mfd platform data
> > * Setting the driver_data in drivers/mfd/cros_ec_dev.c would expose the
> > internals of cros_kbd_led_backlight
> > 
> > Tested on a Framework 13 AMD, Firmware 3.05, and a Jinlon Chromebook.
> > 
> > To: Lee Jones <lee@kernel.org>
> > To: Benson Leung <bleung@chromium.org>
> > To: Guenter Roeck <groeck@chromium.org>
> > To: Tzung-Bi Shih <tzungbi@kernel.org>
> > To: Pavel Machek <pavel@ucw.cz>
> > Cc: chrome-platform@lists.linux.dev
> > Cc: linux-kernel@vger.kernel.org
> > Cc: Dustin Howett <dustin@howett.net>
> > Cc: Mario Limonciello <mario.limonciello@amd.com>
> > Cc: linux-leds@vger.kernel.org
> > Cc: Rajas Paranjpe <paranjperajas@gmail.com>
> > Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
> > 
> > Changes in v3:
> > - Avoid probing multiple times (Confirmed by Rajas)
> > - Add Kconfig dependency on MFD_CROS_EC_DEV
> > - Link to v2: https://lore.kernel.org/r/20240511-cros_ec-kbd-led-framework-v2-0-b20c48109e46@weissschuh.net
> > 
> > Changes in v2:
> > - Fix build with CONFIG_MFD_CROS_EC_DEV=n (kernel test robot)
> > - Split out mfd registration into own commit (Lee)
> > - Simplify keyboard_led_is_mfd_device() with mfd_get_cell()
> > - Link to v1: https://lore.kernel.org/r/20240505-cros_ec-kbd-led-framework-v1-1-bfcca69013d2@weissschuh.net
> > 
> > ---
> > Thomas Weißschuh (4):
> >       leds: class: warn about name collisions earlier
> >       leds: add flag to avoid automatic renaming of led devices
> >       platform/chrome: cros_kbd_led_backlight: allow binding through mfd device
> >       mfd: cros_ec: Register keyboard backlight subdevice
> > 
> >  drivers/leds/led-class.c                         |  9 +++---
> >  drivers/mfd/cros_ec_dev.c                        |  9 ++++++
> >  drivers/platform/chrome/Kconfig                  |  2 +-
> >  drivers/platform/chrome/cros_kbd_led_backlight.c | 40 ++++++++++++++++++++++--
> >  include/linux/leds.h                             |  1 +
> >  5 files changed, 54 insertions(+), 7 deletions(-)
> 
> Looks okay.

Thanks.

> Does the platform patch need to be applied with the others?

Each patch depends on all its predecessors.
(but I'm not sure I understood your question)
Lee Jones May 31, 2024, 3:53 p.m. UTC | #3
On Fri, 31 May 2024, Thomas Weißschuh wrote:

> On 2024-05-31 16:35:30+0000, Lee Jones wrote:
> > On Sun, 26 May 2024, Thomas Weißschuh wrote:
> > 
> > > Extend the cros_ec MFD device to also load cros_kbd_led_backlight
> > > when the EC reports EC_FEATURE_PWM_KEYB.
> > > As the driver can now be probed multiple times, some preparation in the
> > > LED core is necessary to avoid name collisions.
> > > 
> > > Patch 1 is a general cleanup for the LED core.
> > > Patch 2 modifies the LED core to skip the default collision handling.
> > > Patch 3 adds the new probing logic to cros_kbd_led_backlight.
> > > Patch 4 wires up the driver to the cros_ec mfd devices.
> > > 
> > > The helper keyboard_led_is_mfd_device is a bit iffy.
> > > But using match data doesn't work.
> > > 
> > > * driver_data from platform_device_id is overwritten by the mfd platform data
> > > * Setting the driver_data in drivers/mfd/cros_ec_dev.c would expose the
> > > internals of cros_kbd_led_backlight
> > > 
> > > Tested on a Framework 13 AMD, Firmware 3.05, and a Jinlon Chromebook.
> > > 
> > > To: Lee Jones <lee@kernel.org>
> > > To: Benson Leung <bleung@chromium.org>
> > > To: Guenter Roeck <groeck@chromium.org>
> > > To: Tzung-Bi Shih <tzungbi@kernel.org>
> > > To: Pavel Machek <pavel@ucw.cz>
> > > Cc: chrome-platform@lists.linux.dev
> > > Cc: linux-kernel@vger.kernel.org
> > > Cc: Dustin Howett <dustin@howett.net>
> > > Cc: Mario Limonciello <mario.limonciello@amd.com>
> > > Cc: linux-leds@vger.kernel.org
> > > Cc: Rajas Paranjpe <paranjperajas@gmail.com>
> > > Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
> > > 
> > > Changes in v3:
> > > - Avoid probing multiple times (Confirmed by Rajas)
> > > - Add Kconfig dependency on MFD_CROS_EC_DEV
> > > - Link to v2: https://lore.kernel.org/r/20240511-cros_ec-kbd-led-framework-v2-0-b20c48109e46@weissschuh.net
> > > 
> > > Changes in v2:
> > > - Fix build with CONFIG_MFD_CROS_EC_DEV=n (kernel test robot)
> > > - Split out mfd registration into own commit (Lee)
> > > - Simplify keyboard_led_is_mfd_device() with mfd_get_cell()
> > > - Link to v1: https://lore.kernel.org/r/20240505-cros_ec-kbd-led-framework-v1-1-bfcca69013d2@weissschuh.net
> > > 
> > > ---
> > > Thomas Weißschuh (4):
> > >       leds: class: warn about name collisions earlier
> > >       leds: add flag to avoid automatic renaming of led devices
> > >       platform/chrome: cros_kbd_led_backlight: allow binding through mfd device
> > >       mfd: cros_ec: Register keyboard backlight subdevice
> > > 
> > >  drivers/leds/led-class.c                         |  9 +++---
> > >  drivers/mfd/cros_ec_dev.c                        |  9 ++++++
> > >  drivers/platform/chrome/Kconfig                  |  2 +-
> > >  drivers/platform/chrome/cros_kbd_led_backlight.c | 40 ++++++++++++++++++++++--
> > >  include/linux/leds.h                             |  1 +
> > >  5 files changed, 54 insertions(+), 7 deletions(-)
> > 
> > Looks okay.
> 
> Thanks.
> 
> > Does the platform patch need to be applied with the others?
> 
> Each patch depends on all its predecessors.
> (but I'm not sure I understood your question)

Does the Platform patch have 'build-time' deps on the others?
Thomas Weißschuh May 31, 2024, 3:59 p.m. UTC | #4
On 2024-05-31 16:53:56+0000, Lee Jones wrote:
> On Fri, 31 May 2024, Thomas Weißschuh wrote:
> 
> > On 2024-05-31 16:35:30+0000, Lee Jones wrote:
> > > On Sun, 26 May 2024, Thomas Weißschuh wrote:
> > > 
> > > > Extend the cros_ec MFD device to also load cros_kbd_led_backlight
> > > > when the EC reports EC_FEATURE_PWM_KEYB.
> > > > As the driver can now be probed multiple times, some preparation in the
> > > > LED core is necessary to avoid name collisions.
> > > > 
> > > > Patch 1 is a general cleanup for the LED core.
> > > > Patch 2 modifies the LED core to skip the default collision handling.
> > > > Patch 3 adds the new probing logic to cros_kbd_led_backlight.
> > > > Patch 4 wires up the driver to the cros_ec mfd devices.
> > > > 
> > > > The helper keyboard_led_is_mfd_device is a bit iffy.
> > > > But using match data doesn't work.
> > > > 
> > > > * driver_data from platform_device_id is overwritten by the mfd platform data
> > > > * Setting the driver_data in drivers/mfd/cros_ec_dev.c would expose the
> > > > internals of cros_kbd_led_backlight
> > > > 
> > > > Tested on a Framework 13 AMD, Firmware 3.05, and a Jinlon Chromebook.
> > > > 
> > > > To: Lee Jones <lee@kernel.org>
> > > > To: Benson Leung <bleung@chromium.org>
> > > > To: Guenter Roeck <groeck@chromium.org>
> > > > To: Tzung-Bi Shih <tzungbi@kernel.org>
> > > > To: Pavel Machek <pavel@ucw.cz>
> > > > Cc: chrome-platform@lists.linux.dev
> > > > Cc: linux-kernel@vger.kernel.org
> > > > Cc: Dustin Howett <dustin@howett.net>
> > > > Cc: Mario Limonciello <mario.limonciello@amd.com>
> > > > Cc: linux-leds@vger.kernel.org
> > > > Cc: Rajas Paranjpe <paranjperajas@gmail.com>
> > > > Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
> > > > 
> > > > Changes in v3:
> > > > - Avoid probing multiple times (Confirmed by Rajas)
> > > > - Add Kconfig dependency on MFD_CROS_EC_DEV
> > > > - Link to v2: https://lore.kernel.org/r/20240511-cros_ec-kbd-led-framework-v2-0-b20c48109e46@weissschuh.net
> > > > 
> > > > Changes in v2:
> > > > - Fix build with CONFIG_MFD_CROS_EC_DEV=n (kernel test robot)
> > > > - Split out mfd registration into own commit (Lee)
> > > > - Simplify keyboard_led_is_mfd_device() with mfd_get_cell()
> > > > - Link to v1: https://lore.kernel.org/r/20240505-cros_ec-kbd-led-framework-v1-1-bfcca69013d2@weissschuh.net
> > > > 
> > > > ---
> > > > Thomas Weißschuh (4):
> > > >       leds: class: warn about name collisions earlier
> > > >       leds: add flag to avoid automatic renaming of led devices
> > > >       platform/chrome: cros_kbd_led_backlight: allow binding through mfd device
> > > >       mfd: cros_ec: Register keyboard backlight subdevice
> > > > 
> > > >  drivers/leds/led-class.c                         |  9 +++---
> > > >  drivers/mfd/cros_ec_dev.c                        |  9 ++++++
> > > >  drivers/platform/chrome/Kconfig                  |  2 +-
> > > >  drivers/platform/chrome/cros_kbd_led_backlight.c | 40 ++++++++++++++++++++++--
> > > >  include/linux/leds.h                             |  1 +
> > > >  5 files changed, 54 insertions(+), 7 deletions(-)
> > > 
> > > Looks okay.
> > 
> > Thanks.
> > 
> > > Does the platform patch need to be applied with the others?
> > 
> > Each patch depends on all its predecessors.
> > (but I'm not sure I understood your question)
> 
> Does the Platform patch have 'build-time' deps on the others?

Yes.

Patch 3 makes use of LED_REJECT_NAME_CONFLICT which was introduced in Patch 2.

Patch 1, 2, 3 have build-time deps on their predecessors.
Patch 4 has a run-time deps on Patch 3.
Tzung-Bi Shih June 3, 2024, 1:54 a.m. UTC | #5
On Fri, May 31, 2024 at 05:59:01PM +0200, Thomas Weißschuh wrote:
> On 2024-05-31 16:53:56+0000, Lee Jones wrote:
> > On Fri, 31 May 2024, Thomas Weißschuh wrote:
> > 
> > > On 2024-05-31 16:35:30+0000, Lee Jones wrote:
> > > > On Sun, 26 May 2024, Thomas Weißschuh wrote:
> > > > 
> > > > > Extend the cros_ec MFD device to also load cros_kbd_led_backlight
> > > > > when the EC reports EC_FEATURE_PWM_KEYB.
> > > > > As the driver can now be probed multiple times, some preparation in the
> > > > > LED core is necessary to avoid name collisions.
> > > > > 
> > > > > Patch 1 is a general cleanup for the LED core.
> > > > > Patch 2 modifies the LED core to skip the default collision handling.
> > > > > Patch 3 adds the new probing logic to cros_kbd_led_backlight.
> > > > > Patch 4 wires up the driver to the cros_ec mfd devices.
> > > > > 
> > > > > The helper keyboard_led_is_mfd_device is a bit iffy.
> > > > > But using match data doesn't work.
> > > > > 
> > > > > * driver_data from platform_device_id is overwritten by the mfd platform data
> > > > > * Setting the driver_data in drivers/mfd/cros_ec_dev.c would expose the
> > > > > internals of cros_kbd_led_backlight
> > > > > 
> > > > > Tested on a Framework 13 AMD, Firmware 3.05, and a Jinlon Chromebook.
> > > > > 
> > > > > To: Lee Jones <lee@kernel.org>
> > > > > To: Benson Leung <bleung@chromium.org>
> > > > > To: Guenter Roeck <groeck@chromium.org>
> > > > > To: Tzung-Bi Shih <tzungbi@kernel.org>
> > > > > To: Pavel Machek <pavel@ucw.cz>
> > > > > Cc: chrome-platform@lists.linux.dev
> > > > > Cc: linux-kernel@vger.kernel.org
> > > > > Cc: Dustin Howett <dustin@howett.net>
> > > > > Cc: Mario Limonciello <mario.limonciello@amd.com>
> > > > > Cc: linux-leds@vger.kernel.org
> > > > > Cc: Rajas Paranjpe <paranjperajas@gmail.com>
> > > > > Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
> > > > > 
> > > > > Changes in v3:
> > > > > - Avoid probing multiple times (Confirmed by Rajas)
> > > > > - Add Kconfig dependency on MFD_CROS_EC_DEV
> > > > > - Link to v2: https://lore.kernel.org/r/20240511-cros_ec-kbd-led-framework-v2-0-b20c48109e46@weissschuh.net
> > > > > 
> > > > > Changes in v2:
> > > > > - Fix build with CONFIG_MFD_CROS_EC_DEV=n (kernel test robot)
> > > > > - Split out mfd registration into own commit (Lee)
> > > > > - Simplify keyboard_led_is_mfd_device() with mfd_get_cell()
> > > > > - Link to v1: https://lore.kernel.org/r/20240505-cros_ec-kbd-led-framework-v1-1-bfcca69013d2@weissschuh.net
> > > > > 
> > > > > ---
> > > > > Thomas Weißschuh (4):
> > > > >       leds: class: warn about name collisions earlier
> > > > >       leds: add flag to avoid automatic renaming of led devices
> > > > >       platform/chrome: cros_kbd_led_backlight: allow binding through mfd device
> > > > >       mfd: cros_ec: Register keyboard backlight subdevice
> > > > > 
> > > > >  drivers/leds/led-class.c                         |  9 +++---
> > > > >  drivers/mfd/cros_ec_dev.c                        |  9 ++++++
> > > > >  drivers/platform/chrome/Kconfig                  |  2 +-
> > > > >  drivers/platform/chrome/cros_kbd_led_backlight.c | 40 ++++++++++++++++++++++--
> > > > >  include/linux/leds.h                             |  1 +
> > > > >  5 files changed, 54 insertions(+), 7 deletions(-)
> > > > 
> > > > Looks okay.
> > > 
> > > Thanks.
> > > 
> > > > Does the platform patch need to be applied with the others?
> > > 
> > > Each patch depends on all its predecessors.
> > > (but I'm not sure I understood your question)
> > 
> > Does the Platform patch have 'build-time' deps on the others?
> 
> Yes.
> 
> Patch 3 makes use of LED_REJECT_NAME_CONFLICT which was introduced in Patch 2.
> 
> Patch 1, 2, 3 have build-time deps on their predecessors.
> Patch 4 has a run-time deps on Patch 3.

Patch 1 is independent actually.