Add support for flash LEDs found in certain Samsung S2M series PMICs.
The device has two channels for LEDs, typically for the back and front
cameras in mobile devices. Both channels can be independently
controlled, and can be operated in torch or flash modes.

The driver includes initial support for the S2MU005 PMIC flash LEDs.

Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
Link: https://patch.msgid.link/20260516-s2mu005-pmic-v7-6-73f9702fb461@disroot.org
Signed-off-by: Lee Jones <lee@kernel.org>

Various names for Qualcomm as a company are used in user-visible config
options: QCOM, Qualcomm and Qualcomm Technologies.  Switch to unified
"Qualcomm" so it will be easier for users to identify the options when
for example running menuconfig.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260427070117.18363-2-krzysztof.kozlowski@oss.qualcomm.com
Signed-off-by: Lee Jones <lee@kernel.org>

This driver can optionally use the v4l2_flash infrastructure, but fails to
link built=in if that is in a loadable module:

ld.lld-21: error: undefined symbol: v4l2_flash_release
>>> referenced by leds-tps6131x.c:792 (drivers/leds/flash/leds-tps6131x.c:792)

Add the usual Kconfig dependency for it, still allowing it to be built when
CONFIG_V4L2_FLASH_LED_CLASS is disabled.

Fixes: b338a2ae9b31 ("leds: tps6131x: Add support for Texas Instruments TPS6131X flash LED driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20250620114440.4080938-1-arnd@kernel.org
Signed-off-by: Lee Jones <lee@kernel.org>

The TPS61310/TPS61311 is a flash LED driver with I2C interface. Its power
stage is capable of supplying a maximum total current of roughly 1500mA.
The TPS6131x provides three constant-current sinks, capable of sinking up
to 2 x 400mA (LED1 and LED3) and 800mA (LED2) in flash mode. In torch mode
each sink (LED1, LED2, LED3) supports currents up to 175mA.

Signed-off-by: Matthias Fend <matthias.fend@emfend.at>
Link: https://lore.kernel.org/r/20250514-leds-tps6131x-v5-2-a4fb9e7f2c47@emfend.at
Signed-off-by: Lee Jones <lee@kernel.org>

The SY7802 is a current-regulated charge pump which can regulate two
current levels for Flash and Torch modes.

It is a high-current synchronous boost converter with 2-channel high
side current sources. Each channel is able to deliver 900mA current.

Acked-by: Lee Jones <lee@kernel.org>
Signed-off-by: André Apitzsch <git@apitzsch.eu>
Link: https://lore.kernel.org/r/20240624-sy7802-v5-2-7abc9d96bfa6@apitzsch.eu
Signed-off-by: Lee Jones <lee@kernel.org>

Along the same lines as making devm_led_classdev_register() declared
extern unconditional, do the same thing for the two sub-classes
that have similar stubs.

The users of these interfaces go to great lengths to allow building
with both the generic leds API and the extended version, but realistically
there is not much use in this, so just simplify it to always rely
on it and remove the confusing fallback logic.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20240109090715.982332-2-arnd@kernel.org
Signed-off-by: Lee Jones <lee@kernel.org>

The expresswire module requires gpiolib, so anything selecting it
also needs this dependency:

WARNING: unmet direct dependencies detected for LEDS_EXPRESSWIRE
  Depends on [n]: NEW_LEDS [=y] && GPIOLIB [=n]
  Selected by [y]:
  - LEDS_KTD2692 [=y] && NEW_LEDS [=y] && LEDS_CLASS_FLASH [=y] && OF [=y]

Fixes: e59a15af7aa6 ("leds: ktd2692: Convert to use ExpressWire library")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20240213165602.2230970-1-arnd@kernel.org
Signed-off-by: Lee Jones <lee@kernel.org>

The KTD2692 uses the ExpressWire protocol implemented in the newly
introduced ExpressWire library. Convert the driver to use the library.

Suggested-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Duje Mihanović <duje.mihanovic@skole.hr>
Link: https://lore.kernel.org/r/20240125-ktd2801-v5-2-e22da232a825@skole.hr
Signed-off-by: Lee Jones <lee@kernel.org>

Explain in Kconfig that the driver can be compiled as a module.

Signed-off-by: Fenglin Wu <quic_fenglinw@quicinc.com>
Link: https://lore.kernel.org/r/20230725-leds-qcom-flash-driver-tiny-fixes-v2-1-0f5cbce5fed0@quicinc.com
Signed-off-by: Lee Jones <lee@kernel.org>

The MediaTek MT6370 is a highly-integrated smart power management IC,
which includes a single cell Li-Ion/Li-Polymer switching battery
charger, a USB Type-C & Power Delivery (PD) controller, dual Flash
LED current sources, a RGB LED driver, a backlight WLED driver,
a display bias driver and a general LDO for portable devices.

Add support for the MT6370 Flash LED driver. Flash LED in MT6370
has 2 channels and support torch/strobe mode.

Co-developed-by: Alice Chen <alice_chen@richtek.com>
Signed-off-by: Alice Chen <alice_chen@richtek.com>
Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Signed-off-by: ChiaEn Wu <chiaen_wu@richtek.com>
Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/52480420a160e5a4c71715fbbf105e684a16e7c2.1678430444.git.chiaen_wu@richtek.com