leds: Add driver for Qualcomm LPG
The Light Pulse Generator (LPG) is a PWM-block found in a wide range of
PMICs from Qualcomm. These PMICs typically comes with 1-8 LPG instances,
with their output being routed to various other components, such as
current sinks or GPIOs.
Each LPG instance can operate on fixed parameters or based on a shared
lookup-table, altering the duty cycle over time. This provides the means
for hardware assisted transitions of LED brightness.
A typical use case for the fixed parameter mode is to drive a PWM
backlight control signal, the driver therefor allows each LPG instance
to be exposed to the kernel either through the LED framework or the PWM
framework.
A typical use case for the LED configuration is to drive RGB LEDs in
smartphones etc, for which the driver supports multiple channels to be
ganged up to a MULTICOLOR LED. In this configuration the pattern
generators will be synchronized, to allow for multi-color patterns.
The idea of modelling this as a LED driver ontop of a PWM driver was
considered, but setting the properties related to patterns does not fit
in the PWM API. Similarly the idea of just duplicating the lower bits in
a PWM and LED driver separately was considered, but this would not allow
the PWM channels and LEDs to be configured on a per-board basis. The
driver implements the more complex LED interface, and provides a PWM
interface on the side of that, in the same driver.
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Tested-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Luca Weiss <luca@z3ntu.xyz>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Tested-by: Marijn Suijten <marijn.suijten@somainline.org>
[On the Sony Xperia Nile Discovery, SDM630]
Signed-off-by: Pavel Machek <pavel@ucw.cz>
2022-03-03 21:43:00 +00:00
|
|
|
# SPDX-License-Identifier: GPL-2.0
|
|
|
|
|
|
|
|
|
|
if LEDS_CLASS_MULTICOLOR
|
|
|
|
|
|
2023-07-28 15:37:31 +00:00
|
|
|
config LEDS_GROUP_MULTICOLOR
|
|
|
|
|
tristate "LEDs group multi-color support"
|
|
|
|
|
depends on OF || COMPILE_TEST
|
|
|
|
|
help
|
|
|
|
|
This option enables support for monochrome LEDs that are grouped
|
|
|
|
|
into multicolor LEDs which is useful in the case where LEDs of
|
|
|
|
|
different colors are physically grouped in a single multi-color LED
|
|
|
|
|
and driven by a controller that doesn't have multi-color support.
|
|
|
|
|
|
|
|
|
|
To compile this driver as a module, choose M here: the module
|
|
|
|
|
will be called leds-group-multicolor.
|
|
|
|
|
|
2022-05-04 18:49:46 +00:00
|
|
|
config LEDS_PWM_MULTICOLOR
|
|
|
|
|
tristate "PWM driven multi-color LED Support"
|
|
|
|
|
depends on PWM
|
|
|
|
|
help
|
|
|
|
|
This option enables support for PWM driven monochrome LEDs that are
|
|
|
|
|
grouped into multicolor LEDs.
|
|
|
|
|
|
|
|
|
|
To compile this driver as a module, choose M here: the module
|
|
|
|
|
will be called leds-pwm-multicolor.
|
|
|
|
|
|
leds: Add driver for Qualcomm LPG
The Light Pulse Generator (LPG) is a PWM-block found in a wide range of
PMICs from Qualcomm. These PMICs typically comes with 1-8 LPG instances,
with their output being routed to various other components, such as
current sinks or GPIOs.
Each LPG instance can operate on fixed parameters or based on a shared
lookup-table, altering the duty cycle over time. This provides the means
for hardware assisted transitions of LED brightness.
A typical use case for the fixed parameter mode is to drive a PWM
backlight control signal, the driver therefor allows each LPG instance
to be exposed to the kernel either through the LED framework or the PWM
framework.
A typical use case for the LED configuration is to drive RGB LEDs in
smartphones etc, for which the driver supports multiple channels to be
ganged up to a MULTICOLOR LED. In this configuration the pattern
generators will be synchronized, to allow for multi-color patterns.
The idea of modelling this as a LED driver ontop of a PWM driver was
considered, but setting the properties related to patterns does not fit
in the PWM API. Similarly the idea of just duplicating the lower bits in
a PWM and LED driver separately was considered, but this would not allow
the PWM channels and LEDs to be configured on a per-board basis. The
driver implements the more complex LED interface, and provides a PWM
interface on the side of that, in the same driver.
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Tested-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Luca Weiss <luca@z3ntu.xyz>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Tested-by: Marijn Suijten <marijn.suijten@somainline.org>
[On the Sony Xperia Nile Discovery, SDM630]
Signed-off-by: Pavel Machek <pavel@ucw.cz>
2022-03-03 21:43:00 +00:00
|
|
|
config LEDS_QCOM_LPG
|
|
|
|
|
tristate "LED support for Qualcomm LPG"
|
|
|
|
|
depends on OF
|
2022-05-05 08:03:58 +00:00
|
|
|
depends on PWM
|
leds: Add driver for Qualcomm LPG
The Light Pulse Generator (LPG) is a PWM-block found in a wide range of
PMICs from Qualcomm. These PMICs typically comes with 1-8 LPG instances,
with their output being routed to various other components, such as
current sinks or GPIOs.
Each LPG instance can operate on fixed parameters or based on a shared
lookup-table, altering the duty cycle over time. This provides the means
for hardware assisted transitions of LED brightness.
A typical use case for the fixed parameter mode is to drive a PWM
backlight control signal, the driver therefor allows each LPG instance
to be exposed to the kernel either through the LED framework or the PWM
framework.
A typical use case for the LED configuration is to drive RGB LEDs in
smartphones etc, for which the driver supports multiple channels to be
ganged up to a MULTICOLOR LED. In this configuration the pattern
generators will be synchronized, to allow for multi-color patterns.
The idea of modelling this as a LED driver ontop of a PWM driver was
considered, but setting the properties related to patterns does not fit
in the PWM API. Similarly the idea of just duplicating the lower bits in
a PWM and LED driver separately was considered, but this would not allow
the PWM channels and LEDs to be configured on a per-board basis. The
driver implements the more complex LED interface, and provides a PWM
interface on the side of that, in the same driver.
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Tested-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Luca Weiss <luca@z3ntu.xyz>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Tested-by: Marijn Suijten <marijn.suijten@somainline.org>
[On the Sony Xperia Nile Discovery, SDM630]
Signed-off-by: Pavel Machek <pavel@ucw.cz>
2022-03-03 21:43:00 +00:00
|
|
|
depends on SPMI
|
|
|
|
|
help
|
|
|
|
|
This option enables support for the Light Pulse Generator found in a
|
|
|
|
|
wide variety of Qualcomm PMICs. The LPG consists of a number of PWM
|
|
|
|
|
channels and typically a shared pattern lookup table and a current
|
|
|
|
|
sink, intended to drive RGB LEDs. Each channel can either be used as
|
|
|
|
|
a LED, grouped to represent a RGB LED or exposed as PWM channels.
|
|
|
|
|
|
|
|
|
|
If compiled as a module, the module will be named leds-qcom-lpg.
|
|
|
|
|
|
2023-03-10 06:55:55 +00:00
|
|
|
config LEDS_MT6370_RGB
|
|
|
|
|
tristate "LED Support for MediaTek MT6370 PMIC"
|
|
|
|
|
depends on MFD_MT6370
|
2023-03-23 10:54:10 +00:00
|
|
|
select LINEAR_RANGES
|
2023-03-10 06:55:55 +00:00
|
|
|
help
|
|
|
|
|
Say Y here to enable support for MT6370_RGB LED device.
|
|
|
|
|
In MT6370, there are four channel current-sink LED drivers that
|
|
|
|
|
support hardware pattern for constant current, PWM, and breath mode.
|
|
|
|
|
Isink4 channel can also be used as a CHG_VIN power good indicator.
|
|
|
|
|
|
|
|
|
|
This driver can also be built as a module. If so, the module
|
|
|
|
|
will be called "leds-mt6370-rgb".
|
|
|
|
|
|
leds: Add driver for Qualcomm LPG
The Light Pulse Generator (LPG) is a PWM-block found in a wide range of
PMICs from Qualcomm. These PMICs typically comes with 1-8 LPG instances,
with their output being routed to various other components, such as
current sinks or GPIOs.
Each LPG instance can operate on fixed parameters or based on a shared
lookup-table, altering the duty cycle over time. This provides the means
for hardware assisted transitions of LED brightness.
A typical use case for the fixed parameter mode is to drive a PWM
backlight control signal, the driver therefor allows each LPG instance
to be exposed to the kernel either through the LED framework or the PWM
framework.
A typical use case for the LED configuration is to drive RGB LEDs in
smartphones etc, for which the driver supports multiple channels to be
ganged up to a MULTICOLOR LED. In this configuration the pattern
generators will be synchronized, to allow for multi-color patterns.
The idea of modelling this as a LED driver ontop of a PWM driver was
considered, but setting the properties related to patterns does not fit
in the PWM API. Similarly the idea of just duplicating the lower bits in
a PWM and LED driver separately was considered, but this would not allow
the PWM channels and LEDs to be configured on a per-board basis. The
driver implements the more complex LED interface, and provides a PWM
interface on the side of that, in the same driver.
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Tested-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Luca Weiss <luca@z3ntu.xyz>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Tested-by: Marijn Suijten <marijn.suijten@somainline.org>
[On the Sony Xperia Nile Discovery, SDM630]
Signed-off-by: Pavel Machek <pavel@ucw.cz>
2022-03-03 21:43:00 +00:00
|
|
|
endif # LEDS_CLASS_MULTICOLOR
|