- New Drivers
- Add support for MediaTek MT6370 Backlight -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEdrbJNaO+IJqU8IdIUa+KL4f8d2EFAmM9exUACgkQUa+KL4f8 d2FZlg//fl0+TbyZMFh9pXgoaNeZKTOQXpKKQLBwOnZ438eC01s1OrfwmRkVxiOm PhUzwwG0qV83DO4jYRcjZxic2qfi2ZzRUK6mZuV6h4f1aFEDezoBneIVSKv97gTO sY4kYG1FxLd/bYfqjfMVcgenxBPbHuZcv1kPwA3d/x/r+feuy95cEj5hCG+4cKbU Qw7Gfc5isao8Vz/gStTISZADl/+5h9fYlQF5cZUJYLvUjHX8Z21YimFo3A5wYaEE eISn3Pg8d2AzKMeCEiosXI7AOQ0LQpfNmM7/R/WY8f691wmWndpe0FeCt2nH3s/1 EWL6IltzSU20xqfM6BRQ7dO8dHXaokle+gTxTwmTGYyKLrcBXuUA9gez3q7IQeGA 2M32bEpxOXEA7opQB4l5sNs/zYnMvafp1BD0Ln2S/UXftLgsdsroxsYJGfrDa0x/ JOOplca0v6sNTWWoLebjx2+CMxgMfP3A6X+e1F8msqL37UFUD0xzWv2livUdw545 aaYHKJIDCfeCz/vafzv/bsT5OXb75buGz/8qzNLDC/An+W34ewSBbA2+uQWbu1xS I9/lz1Ffts/rYIy9B2+IDfGwzd7H5KkokNq9lbvwURyUy5MllHcvIbcerdLdxI1x 0VqC9wHWhb833NjHpmPjsUY5nM8Fy33I3EB1tFULdvbycY6qqCc= =JlQW -----END PGP SIGNATURE----- Merge tag 'backlight-next-6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight Pull backlight update from Lee Jones: - Add support for MediaTek MT6370 Backlight * tag 'backlight-next-6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight: video: backlight: mt6370: Add MediaTek MT6370 support dt-bindings: backlight: Add MediaTek MT6370 backlight
This commit is contained in:
Linus Torvalds
commit
a47e60729d
@ -0,0 +1,121 @@
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/leds/backlight/mediatek,mt6370-backlight.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: MediaTek MT6370 Backlight
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maintainers:
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- ChiaEn Wu <chiaen_wu@richtek.com>
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description: |
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This module is part of the MT6370 MFD device.
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The MT6370 Backlight WLED driver supports up to a 29V output voltage for
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4 channels of 8 series WLEDs. Each channel supports up to 30mA of current
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capability with 2048 current steps (11 bits, only for MT6370/MT6371) or
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16384 current steps (14 bits, only for MT6372) in exponential or linear
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mapping curves.
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allOf:
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- $ref: common.yaml#
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properties:
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compatible:
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enum:
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- mediatek,mt6370-backlight
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- mediatek,mt6372-backlight
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default-brightness:
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minimum: 0
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max-brightness:
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minimum: 0
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enable-gpios:
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description: External backlight 'enable' pin
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maxItems: 1
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mediatek,bled-pwm-enable:
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description: |
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Enable external PWM input for backlight dimming
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type: boolean
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mediatek,bled-pwm-hys-enable:
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description: |
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Enable the backlight input-hysteresis for PWM mode
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type: boolean
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mediatek,bled-pwm-hys-input-th-steps:
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$ref: /schemas/types.yaml#/definitions/uint8
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enum: [1, 4, 16, 64]
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description: |
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The selection of the upper and lower bounds threshold of backlight
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PWM resolution. If we choose selection 64, the variation of PWM
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resolution needs more than 64 steps.
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mediatek,bled-ovp-shutdown:
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description: |
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Enable the backlight shutdown when OVP level triggered
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type: boolean
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mediatek,bled-ovp-microvolt:
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enum: [17000000, 21000000, 25000000, 29000000]
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description: |
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Backlight OVP level selection.
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mediatek,bled-ocp-shutdown:
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description: |
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Enable the backlight shutdown when OCP level triggerred.
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type: boolean
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mediatek,bled-ocp-microamp:
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enum: [900000, 1200000, 1500000, 1800000]
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description: |
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Backlight OC level selection.
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mediatek,bled-exponential-mode-enable:
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description: |
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Enable the exponential mode of backlight brightness. If this property
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is not enabled, the default is to use linear mode.
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type: boolean
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mediatek,bled-channel-use:
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$ref: /schemas/types.yaml#/definitions/uint8
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description: |
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Backlight LED channel to be used.
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Each bit mapping to:
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- 0: CH4
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- 1: CH3
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- 2: CH2
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- 3: CH1
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minimum: 1
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maximum: 15
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if:
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properties:
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compatible:
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contains:
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const: mediatek,mt6372-backlight
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then:
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properties:
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default-brightness:
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maximum: 16384
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max-brightness:
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maximum: 16384
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else:
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properties:
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default-brightness:
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maximum: 2048
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max-brightness:
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maximum: 2048
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required:
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- compatible
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- mediatek,bled-channel-use
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additionalProperties: false
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@ -268,6 +268,19 @@ config BACKLIGHT_MAX8925
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If you have a LCD backlight connected to the WLED output of MAX8925
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WLED output, say Y here to enable this driver.
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config BACKLIGHT_MT6370
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tristate "MediaTek MT6370 Backlight Driver"
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depends on MFD_MT6370
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help
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This enables support for Mediatek MT6370 Backlight driver.
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It's commonly used to drive the display WLED. There are 4 channels
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inside, and each channel supports up to 30mA of current capability
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with 2048 current steps (only for MT6370/MT6371) or 16384 current
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steps (only for MT6372) in exponential or linear mapping curves.
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This driver can also be built as a module. If so, the module
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will be called "mt6370-backlight".
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config BACKLIGHT_APPLE
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tristate "Apple Backlight Driver"
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depends on X86 && ACPI
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@ -44,6 +44,7 @@ obj-$(CONFIG_BACKLIGHT_LP855X) += lp855x_bl.o
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obj-$(CONFIG_BACKLIGHT_LP8788) += lp8788_bl.o
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obj-$(CONFIG_BACKLIGHT_LV5207LP) += lv5207lp.o
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obj-$(CONFIG_BACKLIGHT_MAX8925) += max8925_bl.o
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obj-$(CONFIG_BACKLIGHT_MT6370) += mt6370-backlight.o
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obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o
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obj-$(CONFIG_BACKLIGHT_PANDORA) += pandora_bl.o
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obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o
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351
drivers/video/backlight/mt6370-backlight.c
Normal file
351
drivers/video/backlight/mt6370-backlight.c
Normal file
@ -0,0 +1,351 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2022 Richtek Technology Corp.
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*
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* Author: ChiaEn Wu <chiaen_wu@richtek.com>
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*/
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#include <linux/backlight.h>
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#include <linux/bitfield.h>
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#include <linux/bits.h>
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#include <linux/gpio/consumer.h>
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#include <linux/kernel.h>
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#include <linux/minmax.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/regmap.h>
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#define MT6370_REG_DEV_INFO 0x100
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#define MT6370_REG_BL_EN 0x1A0
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#define MT6370_REG_BL_BSTCTRL 0x1A1
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#define MT6370_REG_BL_PWM 0x1A2
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#define MT6370_REG_BL_DIM2 0x1A4
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#define MT6370_VENID_MASK GENMASK(7, 4)
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#define MT6370_BL_EXT_EN_MASK BIT(7)
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#define MT6370_BL_EN_MASK BIT(6)
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#define MT6370_BL_CODE_MASK BIT(0)
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#define MT6370_BL_CH_MASK GENMASK(5, 2)
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#define MT6370_BL_CH_SHIFT 2
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#define MT6370_BL_DIM2_COMMON_MASK GENMASK(2, 0)
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#define MT6370_BL_DIM2_COMMON_SHIFT 3
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#define MT6370_BL_DIM2_6372_MASK GENMASK(5, 0)
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#define MT6370_BL_DIM2_6372_SHIFT 6
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#define MT6370_BL_PWM_EN_MASK BIT(7)
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#define MT6370_BL_PWM_HYS_EN_MASK BIT(2)
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#define MT6370_BL_PWM_HYS_SEL_MASK GENMASK(1, 0)
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#define MT6370_BL_OVP_EN_MASK BIT(7)
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#define MT6370_BL_OVP_SEL_MASK GENMASK(6, 5)
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#define MT6370_BL_OVP_SEL_SHIFT 5
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#define MT6370_BL_OC_EN_MASK BIT(3)
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#define MT6370_BL_OC_SEL_MASK GENMASK(2, 1)
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#define MT6370_BL_OC_SEL_SHIFT 1
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#define MT6370_BL_PWM_HYS_TH_MIN_STEP 1
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#define MT6370_BL_PWM_HYS_TH_MAX_STEP 64
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#define MT6370_BL_OVP_MIN_UV 17000000
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#define MT6370_BL_OVP_MAX_UV 29000000
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#define MT6370_BL_OVP_STEP_UV 4000000
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#define MT6370_BL_OCP_MIN_UA 900000
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#define MT6370_BL_OCP_MAX_UA 1800000
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#define MT6370_BL_OCP_STEP_UA 300000
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#define MT6370_BL_MAX_COMMON_BRIGHTNESS 2048
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#define MT6370_BL_MAX_6372_BRIGHTNESS 16384
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#define MT6370_BL_MAX_CH 15
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enum {
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MT6370_VID_COMMON = 1,
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MT6370_VID_6372,
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};
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struct mt6370_priv {
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u8 dim2_mask;
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u8 dim2_shift;
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int def_max_brightness;
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struct backlight_device *bl;
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struct device *dev;
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struct gpio_desc *enable_gpio;
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struct regmap *regmap;
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};
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static int mt6370_bl_update_status(struct backlight_device *bl_dev)
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{
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struct mt6370_priv *priv = bl_get_data(bl_dev);
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int brightness = backlight_get_brightness(bl_dev);
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unsigned int enable_val;
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u8 brightness_val[2];
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int ret;
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if (brightness) {
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brightness_val[0] = (brightness - 1) & priv->dim2_mask;
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brightness_val[1] = (brightness - 1) >> priv->dim2_shift;
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ret = regmap_raw_write(priv->regmap, MT6370_REG_BL_DIM2,
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brightness_val, sizeof(brightness_val));
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if (ret)
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return ret;
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}
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gpiod_set_value(priv->enable_gpio, !!brightness);
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enable_val = brightness ? MT6370_BL_EN_MASK : 0;
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return regmap_update_bits(priv->regmap, MT6370_REG_BL_EN,
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MT6370_BL_EN_MASK, enable_val);
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}
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static int mt6370_bl_get_brightness(struct backlight_device *bl_dev)
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{
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struct mt6370_priv *priv = bl_get_data(bl_dev);
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unsigned int enable;
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u8 brightness_val[2];
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int brightness, ret;
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ret = regmap_read(priv->regmap, MT6370_REG_BL_EN, &enable);
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if (ret)
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return ret;
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if (!(enable & MT6370_BL_EN_MASK))
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return 0;
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ret = regmap_raw_read(priv->regmap, MT6370_REG_BL_DIM2,
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brightness_val, sizeof(brightness_val));
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if (ret)
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return ret;
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brightness = brightness_val[1] << priv->dim2_shift;
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brightness += brightness_val[0] & priv->dim2_mask;
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return brightness + 1;
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}
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static const struct backlight_ops mt6370_bl_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.update_status = mt6370_bl_update_status,
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.get_brightness = mt6370_bl_get_brightness,
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};
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static int mt6370_init_backlight_properties(struct mt6370_priv *priv,
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struct backlight_properties *props)
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{
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struct device *dev = priv->dev;
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u8 prop_val;
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u32 brightness, ovp_uV, ocp_uA;
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unsigned int mask, val;
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int ret;
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/* Vendor optional properties */
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val = 0;
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if (device_property_read_bool(dev, "mediatek,bled-pwm-enable"))
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val |= MT6370_BL_PWM_EN_MASK;
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if (device_property_read_bool(dev, "mediatek,bled-pwm-hys-enable"))
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val |= MT6370_BL_PWM_HYS_EN_MASK;
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ret = device_property_read_u8(dev,
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"mediatek,bled-pwm-hys-input-th-steps",
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&prop_val);
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if (!ret) {
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prop_val = clamp_val(prop_val,
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MT6370_BL_PWM_HYS_TH_MIN_STEP,
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MT6370_BL_PWM_HYS_TH_MAX_STEP);
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prop_val = prop_val <= 1 ? 0 :
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prop_val <= 4 ? 1 :
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prop_val <= 16 ? 2 : 3;
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val |= prop_val;
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}
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ret = regmap_update_bits(priv->regmap, MT6370_REG_BL_PWM,
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val, val);
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if (ret)
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return ret;
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val = 0;
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if (device_property_read_bool(dev, "mediatek,bled-ovp-shutdown"))
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val |= MT6370_BL_OVP_EN_MASK;
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ret = device_property_read_u32(dev, "mediatek,bled-ovp-microvolt",
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&ovp_uV);
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if (!ret) {
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ovp_uV = clamp_val(ovp_uV, MT6370_BL_OVP_MIN_UV,
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MT6370_BL_OVP_MAX_UV);
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ovp_uV = DIV_ROUND_UP(ovp_uV - MT6370_BL_OVP_MIN_UV,
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MT6370_BL_OVP_STEP_UV);
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val |= ovp_uV << MT6370_BL_OVP_SEL_SHIFT;
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}
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if (device_property_read_bool(dev, "mediatek,bled-ocp-shutdown"))
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val |= MT6370_BL_OC_EN_MASK;
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ret = device_property_read_u32(dev, "mediatek,bled-ocp-microamp",
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&ocp_uA);
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if (!ret) {
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ocp_uA = clamp_val(ocp_uA, MT6370_BL_OCP_MIN_UA,
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MT6370_BL_OCP_MAX_UA);
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ocp_uA = DIV_ROUND_UP(ocp_uA - MT6370_BL_OCP_MIN_UA,
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MT6370_BL_OCP_STEP_UA);
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val |= ocp_uA << MT6370_BL_OC_SEL_SHIFT;
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}
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ret = regmap_update_bits(priv->regmap, MT6370_REG_BL_BSTCTRL,
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val, val);
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if (ret)
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return ret;
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/* Common properties */
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ret = device_property_read_u32(dev, "max-brightness", &brightness);
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if (ret)
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brightness = priv->def_max_brightness;
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props->max_brightness = min_t(u32, brightness, priv->def_max_brightness);
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ret = device_property_read_u32(dev, "default-brightness", &brightness);
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if (ret)
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brightness = props->max_brightness;
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props->brightness = min_t(u32, brightness, props->max_brightness);
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val = 0;
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if (device_property_read_bool(dev, "mediatek,bled-exponential-mode-enable")) {
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val |= MT6370_BL_CODE_MASK;
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props->scale = BACKLIGHT_SCALE_NON_LINEAR;
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} else
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props->scale = BACKLIGHT_SCALE_LINEAR;
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ret = device_property_read_u8(dev, "mediatek,bled-channel-use",
|
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&prop_val);
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if (ret) {
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dev_err(dev, "mediatek,bled-channel-use DT property missing\n");
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return ret;
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}
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if (!prop_val || prop_val > MT6370_BL_MAX_CH) {
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dev_err(dev,
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"No channel specified or over than upper bound (%d)\n",
|
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prop_val);
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return -EINVAL;
|
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}
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mask = MT6370_BL_EXT_EN_MASK | MT6370_BL_CH_MASK;
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val |= prop_val << MT6370_BL_CH_SHIFT;
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if (priv->enable_gpio)
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val |= MT6370_BL_EXT_EN_MASK;
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return regmap_update_bits(priv->regmap, MT6370_REG_BL_EN, mask, val);
|
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}
|
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static int mt6370_check_vendor_info(struct mt6370_priv *priv)
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{
|
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/*
|
||||
* Because MT6372 uses 14 bits to control the brightness,
|
||||
* MT6370 and MT6371 use 11 bits. This function is used
|
||||
* to check the vendor's ID and set the relative hardware
|
||||
* mask, shift and default maximum brightness value that
|
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* should be used.
|
||||
*/
|
||||
unsigned int dev_info, hw_vid, of_vid;
|
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int ret;
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||||
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||||
ret = regmap_read(priv->regmap, MT6370_REG_DEV_INFO, &dev_info);
|
||||
if (ret)
|
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return ret;
|
||||
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||||
of_vid = (uintptr_t)device_get_match_data(priv->dev);
|
||||
hw_vid = FIELD_GET(MT6370_VENID_MASK, dev_info);
|
||||
hw_vid = (hw_vid == 0x9 || hw_vid == 0xb) ? MT6370_VID_6372 : MT6370_VID_COMMON;
|
||||
if (hw_vid != of_vid)
|
||||
return dev_err_probe(priv->dev, -EINVAL,
|
||||
"Buggy DT, wrong compatible string\n");
|
||||
|
||||
if (hw_vid == MT6370_VID_6372) {
|
||||
priv->dim2_mask = MT6370_BL_DIM2_6372_MASK;
|
||||
priv->dim2_shift = MT6370_BL_DIM2_6372_SHIFT;
|
||||
priv->def_max_brightness = MT6370_BL_MAX_6372_BRIGHTNESS;
|
||||
} else {
|
||||
priv->dim2_mask = MT6370_BL_DIM2_COMMON_MASK;
|
||||
priv->dim2_shift = MT6370_BL_DIM2_COMMON_SHIFT;
|
||||
priv->def_max_brightness = MT6370_BL_MAX_COMMON_BRIGHTNESS;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mt6370_bl_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct backlight_properties props = {
|
||||
.type = BACKLIGHT_RAW,
|
||||
};
|
||||
struct device *dev = &pdev->dev;
|
||||
struct mt6370_priv *priv;
|
||||
int ret;
|
||||
|
||||
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
|
||||
if (!priv)
|
||||
return -ENOMEM;
|
||||
|
||||
priv->dev = dev;
|
||||
|
||||
priv->regmap = dev_get_regmap(dev->parent, NULL);
|
||||
if (!priv->regmap)
|
||||
return dev_err_probe(dev, -ENODEV, "Failed to get regmap\n");
|
||||
|
||||
ret = mt6370_check_vendor_info(priv);
|
||||
if (ret)
|
||||
return dev_err_probe(dev, ret, "Failed to check vendor info\n");
|
||||
|
||||
priv->enable_gpio = devm_gpiod_get_optional(dev, "enable",
|
||||
GPIOD_OUT_HIGH);
|
||||
if (IS_ERR(priv->enable_gpio))
|
||||
return dev_err_probe(dev, PTR_ERR(priv->enable_gpio),
|
||||
"Failed to get 'enable' gpio\n");
|
||||
|
||||
ret = mt6370_init_backlight_properties(priv, &props);
|
||||
if (ret)
|
||||
return dev_err_probe(dev, ret,
|
||||
"Failed to init backlight properties\n");
|
||||
|
||||
priv->bl = devm_backlight_device_register(dev, pdev->name, dev, priv,
|
||||
&mt6370_bl_ops, &props);
|
||||
if (IS_ERR(priv->bl))
|
||||
return dev_err_probe(dev, PTR_ERR(priv->bl),
|
||||
"Failed to register backlight\n");
|
||||
|
||||
backlight_update_status(priv->bl);
|
||||
platform_set_drvdata(pdev, priv);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mt6370_bl_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct mt6370_priv *priv = platform_get_drvdata(pdev);
|
||||
struct backlight_device *bl_dev = priv->bl;
|
||||
|
||||
bl_dev->props.brightness = 0;
|
||||
backlight_update_status(priv->bl);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id mt6370_bl_of_match[] = {
|
||||
{ .compatible = "mediatek,mt6370-backlight", .data = (void *)MT6370_VID_COMMON },
|
||||
{ .compatible = "mediatek,mt6372-backlight", .data = (void *)MT6370_VID_6372 },
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, mt6370_bl_of_match);
|
||||
|
||||
static struct platform_driver mt6370_bl_driver = {
|
||||
.driver = {
|
||||
.name = "mt6370-backlight",
|
||||
.of_match_table = mt6370_bl_of_match,
|
||||
},
|
||||
.probe = mt6370_bl_probe,
|
||||
.remove = mt6370_bl_remove,
|
||||
};
|
||||
module_platform_driver(mt6370_bl_driver);
|
||||
|
||||
MODULE_AUTHOR("ChiaEn Wu <chiaen_wu@richtek.com>");
|
||||
MODULE_DESCRIPTION("MediaTek MT6370 Backlight Driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user