[0/3] leds: tps68470: LED driver for TPS68470

Message

Kate Hsuan Jan. 19, 2023, 7:56 a.m. UTC

This work allows user to control the indicator and flash LEDs though
sysfs in user space. TPS68470 is a part of INT3470 and provides GPIO,
LED, and power controls.

To allow the user to control these two LEDs, two masks for the
ILEDCTL, called TPS68470_ILEDCTL_ENA and TPS68470_ILEDCTL_ENA and a two
bits mask, called TPS68470_ILEDCTL_CTRLB are defined and are used to
enable/disable the LEDs and set the power status, respectively.

The LED driver called leds-tps68470 provides the sysfs interface and
the register configuration implementation. For the indicator LED,
only TPS68470_ILEDCTL_ENA needs to be set to turn on/off the LED. For the
flash LED, TPS68470 provides 4 levels of power settings. After enabling
the TPS68470_ILEDCTL_ENB, the power level should also be set.
The strategy is

Brightness  |  Power
=======================
LED_OFF     |   -
LED_ON      |   4mA
LED_HALF    |   8mA
LED_FULL    |   16mA

Moreover, the user and application can set the brightness through sysfs,
/sys/class/leds/tps68470-ileda and /sys/class/leds/tps68470-iledb

Kate Hsuan (3):
  platform: x86: int3472: Add MFD cell for tps68470 LED
  include: mfd: tps68470: Add masks for LEDA and LEDB
  leds: tps68470: Add LED control for tps68470

 drivers/leds/Kconfig                          |  12 ++
 drivers/leds/Makefile                         |   1 +
 drivers/leds/leds-tps68470.c                  | 170 ++++++++++++++++++
 drivers/platform/x86/intel/int3472/tps68470.c |   3 +-
 include/linux/mfd/tps68470.h                  |   5 +
 5 files changed, 190 insertions(+), 1 deletion(-)
 create mode 100644 drivers/leds/leds-tps68470.c