lights: Add LP5562 RGBLED driver

This adds support for the TI LP5562 RGB LED driver.

Things to note:
- The driver is initialized in simple PWM mode using its internal clock,
  for R,G,B, but not for W(hite).
- The chip doesn't have a WHO_AM_I or DEVICE_ID register to check.
  Instead we read the W_CURRENT register that we're generally not using
  and therefore doesn't get changed.
- The current is left at the default 17.5 mA but could be changed using
  the command line argument.

Datasheet:
https://www.ti.com/lit/ds/symlink/lp5562.pdf

Signed-off-by: Julian Oes <julian@oes.ch>

ROMFS/px4fmu_common/init.d/rcS

@@ -254,6 +254,7 @@ else
 	#
 	rgbled start -X -q
 	rgbled_ncp5623c start -X -q
+	rgbled_lp5562 start -X
 
 	#
 	# Override parameters from user configuration file.

src/drivers/drv_sensor.h

@@ -157,6 +157,8 @@
 #define DRV_LED_DEVTYPE_RGBLED        0x7a
 #define DRV_LED_DEVTYPE_RGBLED_NCP5623C 0x7b
 #define DRV_LED_DEVTYPE_RGBLED_IS31FL3195    0xbf
+#define DRV_LED_DEVTYPE_RGBLED_LP5562    0xc0
+
 #define DRV_BAT_DEVTYPE_SMBUS         0x7c
 #define DRV_SENS_DEVTYPE_IRLOCK       0x7d
 #define DRV_SENS_DEVTYPE_PCF8583      0x7e

src/drivers/lights/CMakeLists.txt

@@ -35,4 +35,5 @@
 add_subdirectory(rgbled)
 add_subdirectory(rgbled_ncp5623c)
 add_subdirectory(rgbled_is31fl3195)
+add_subdirectory(rgbled_lp5562)
 #add_subdirectory(rgbled_pwm) # requires board support (BOARD_HAS_LED_PWM/BOARD_HAS_UI_LED_PWM)

src/drivers/lights/Kconfig

@@ -5,6 +5,7 @@ menu "Lights"
         select DRIVERS_LIGHTS_RGBLED
         select DRIVERS_LIGHTS_RGBLED_NCP5623C
         select DRIVERS_LIGHTS_RGBLED_IS31FL3195
+        select DRIVERS_LIGHTS_RGBLED_LP5562
         ---help---
             Enable default set of light drivers
     rsource "*/Kconfig"

src/drivers/lights/rgbled_lp5562/CMakeLists.txt

@@ -0,0 +1,42 @@
+############################################################################
+#
+#   Copyright (c) 2023 PX4 Development Team. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name PX4 nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+px4_add_module(
+	MODULE drivers__rgbled_lp5562
+	MAIN rgbled_lp5562
+	SRCS
+		rgbled_lp5562.cpp
+	DEPENDS
+		drivers__device
+		led
+	)

src/drivers/lights/rgbled_lp5562/Kconfig

@@ -0,0 +1,5 @@
+menuconfig DRIVERS_LIGHTS_RGBLED_LP5562
+	bool "rgbled lp5562"
+	default n
+	---help---
+		Enable support for RGBLED LP5562 driver