| Message ID | 20241206172735.4310-3-towinchenmi@gmail.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Apple DWI backlight driver | expand |
Hi Nick, kernel test robot noticed the following build errors: [auto build test ERROR on 40384c840ea1944d7c5a392e8975ed088ecf0b37] url: https://github.com/intel-lab-lkp/linux/commits/Nick-Chan/dt-bindings-leds-backlight-apple-dwi-bl-Add-bindings-for-Apple-DWI-backlight/20241207-013254 base: 40384c840ea1944d7c5a392e8975ed088ecf0b37 patch link: https://lore.kernel.org/r/20241206172735.4310-3-towinchenmi%40gmail.com patch subject: [PATCH 2/3] backlight: dwi_bl: Add Apple DWI backlight driver config: arc-randconfig-001-20241207 (https://download.01.org/0day-ci/archive/20241207/202412070721.9tZI9Ogl-lkp@intel.com/config) compiler: arceb-elf-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241207/202412070721.9tZI9Ogl-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202412070721.9tZI9Ogl-lkp@intel.com/ All errors (new ones prefixed by >>): drivers/video/backlight/dwi_bl.c: In function 'dwi_bl_update_status': >> drivers/video/backlight/dwi_bl.c:46:16: error: implicit declaration of function 'FIELD_PREP' [-Werror=implicit-function-declaration] 46 | cmd |= FIELD_PREP(DWI_BL_CMD_DATA, brightness); | ^~~~~~~~~~ drivers/video/backlight/dwi_bl.c: In function 'dwi_bl_get_brightness': >> drivers/video/backlight/dwi_bl.c:61:16: error: implicit declaration of function 'FIELD_GET' [-Werror=implicit-function-declaration] 61 | return FIELD_GET(DWI_BL_CMD_DATA, cmd); | ^~~~~~~~~ cc1: some warnings being treated as errors vim +/FIELD_PREP +46 drivers/video/backlight/dwi_bl.c 37 38 static int dwi_bl_update_status(struct backlight_device *bl) 39 { 40 struct apple_dwi_bl *dwi_bl = bl_get_data(bl); 41 42 int brightness = backlight_get_brightness(bl); 43 44 u32 cmd = 0; 45 > 46 cmd |= FIELD_PREP(DWI_BL_CMD_DATA, brightness); 47 cmd |= FIELD_PREP(DWI_BL_CMD_TYPE, DWI_BL_CMD_TYPE_SET_BRIGHTNESS); 48 49 writel(cmd, dwi_bl->base + DWI_BL_CMD); 50 writel(DWI_BL_CTL_SEND, dwi_bl->base + DWI_BL_CTL); 51 52 return 0; 53 } 54 55 static int dwi_bl_get_brightness(struct backlight_device *bl) 56 { 57 struct apple_dwi_bl *dwi_bl = bl_get_data(bl); 58 59 u32 cmd = readl(dwi_bl->base + DWI_BL_CMD); 60 > 61 return FIELD_GET(DWI_BL_CMD_DATA, cmd); 62 } 63
Hi Nick, kernel test robot noticed the following build errors: [auto build test ERROR on 40384c840ea1944d7c5a392e8975ed088ecf0b37] url: https://github.com/intel-lab-lkp/linux/commits/Nick-Chan/dt-bindings-leds-backlight-apple-dwi-bl-Add-bindings-for-Apple-DWI-backlight/20241207-013254 base: 40384c840ea1944d7c5a392e8975ed088ecf0b37 patch link: https://lore.kernel.org/r/20241206172735.4310-3-towinchenmi%40gmail.com patch subject: [PATCH 2/3] backlight: dwi_bl: Add Apple DWI backlight driver config: hexagon-randconfig-001-20241207 (https://download.01.org/0day-ci/archive/20241207/202412070752.4Q1AOuGo-lkp@intel.com/config) compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241207/202412070752.4Q1AOuGo-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202412070752.4Q1AOuGo-lkp@intel.com/ All errors (new ones prefixed by >>): >> drivers/video/backlight/dwi_bl.c:46:9: error: implicit declaration of function 'FIELD_PREP' is invalid in C99 [-Werror,-Wimplicit-function-declaration] cmd |= FIELD_PREP(DWI_BL_CMD_DATA, brightness); ^ >> drivers/video/backlight/dwi_bl.c:61:9: error: implicit declaration of function 'FIELD_GET' is invalid in C99 [-Werror,-Wimplicit-function-declaration] return FIELD_GET(DWI_BL_CMD_DATA, cmd); ^ 2 errors generated. vim +/FIELD_PREP +46 drivers/video/backlight/dwi_bl.c 37 38 static int dwi_bl_update_status(struct backlight_device *bl) 39 { 40 struct apple_dwi_bl *dwi_bl = bl_get_data(bl); 41 42 int brightness = backlight_get_brightness(bl); 43 44 u32 cmd = 0; 45 > 46 cmd |= FIELD_PREP(DWI_BL_CMD_DATA, brightness); 47 cmd |= FIELD_PREP(DWI_BL_CMD_TYPE, DWI_BL_CMD_TYPE_SET_BRIGHTNESS); 48 49 writel(cmd, dwi_bl->base + DWI_BL_CMD); 50 writel(DWI_BL_CTL_SEND, dwi_bl->base + DWI_BL_CTL); 51 52 return 0; 53 } 54 55 static int dwi_bl_get_brightness(struct backlight_device *bl) 56 { 57 struct apple_dwi_bl *dwi_bl = bl_get_data(bl); 58 59 u32 cmd = readl(dwi_bl->base + DWI_BL_CMD); 60 > 61 return FIELD_GET(DWI_BL_CMD_DATA, cmd); 62 } 63
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 3614a5d29c71..e64cc3d51ac5 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -166,6 +166,18 @@ config BACKLIGHT_EP93XX To compile this driver as a module, choose M here: the module will be called ep93xx_bl. +config BACKLIGHT_APPLE_DWI + tristate "Apple DWI 2-Wire Interface Backlight Driver" + depends on ARCH_APPLE || COMPILE_TEST + default y + help + Say Y to enable the backlight driver for backlight controllers + attached via the Apple DWI 2-wire interface which is found in some + Apple iPhones, iPads and iPod touches. + + To compile this driver as a module, choose M here: the module will + be called dwi_bl. + config BACKLIGHT_IPAQ_MICRO tristate "iPAQ microcontroller backlight driver" depends on MFD_IPAQ_MICRO diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 8fc98f760a8a..0a569d7f0210 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -28,6 +28,7 @@ obj-$(CONFIG_BACKLIGHT_BD6107) += bd6107.o obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o obj-$(CONFIG_BACKLIGHT_DA903X) += da903x_bl.o obj-$(CONFIG_BACKLIGHT_DA9052) += da9052_bl.o +obj-$(CONFIG_BACKLIGHT_APPLE_DWI) += dwi_bl.o obj-$(CONFIG_BACKLIGHT_EP93XX) += ep93xx_bl.o obj-$(CONFIG_BACKLIGHT_GPIO) += gpio_backlight.o obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o diff --git a/drivers/video/backlight/dwi_bl.c b/drivers/video/backlight/dwi_bl.c new file mode 100644 index 000000000000..6dd7edf661fd --- /dev/null +++ b/drivers/video/backlight/dwi_bl.c @@ -0,0 +1,123 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT +/* + * Driver for backlight controllers attached via Apple DWI 2-wire interface + * + * Copyright (c) 2024 Nick Chan <towinchenmi@gmail.com> + */ + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/backlight.h> + +#define DWI_BL_CTL 0x0 +#define DWI_BL_CTL_SEND1 BIT(0) +#define DWI_BL_CTL_SEND2 BIT(4) +#define DWI_BL_CTL_SEND3 BIT(5) +#define DWI_BL_CTL_LE_DATA BIT(6) +/* Only used on Apple A9 and later */ +#define DWI_BL_CTL_SEND4 BIT(12) + +#define DWI_BL_CMD 0x4 +#define DWI_BL_CMD_TYPE GENMASK(31, 28) +#define DWI_BL_CMD_TYPE_SET_BRIGHTNESS 0xa +#define DWI_BL_CMD_DATA GENMASK(10, 0) + +#define DWI_BL_CTL_SEND (DWI_BL_CTL_SEND1 | \ + DWI_BL_CTL_SEND2 | \ + DWI_BL_CTL_SEND3 | \ + DWI_BL_CTL_LE_DATA | \ + DWI_BL_CTL_SEND4) + +#define DWI_BL_MAX_BRIGHTNESS 2047 + +struct apple_dwi_bl { + void __iomem *base; +}; + +static int dwi_bl_update_status(struct backlight_device *bl) +{ + struct apple_dwi_bl *dwi_bl = bl_get_data(bl); + + int brightness = backlight_get_brightness(bl); + + u32 cmd = 0; + + cmd |= FIELD_PREP(DWI_BL_CMD_DATA, brightness); + cmd |= FIELD_PREP(DWI_BL_CMD_TYPE, DWI_BL_CMD_TYPE_SET_BRIGHTNESS); + + writel(cmd, dwi_bl->base + DWI_BL_CMD); + writel(DWI_BL_CTL_SEND, dwi_bl->base + DWI_BL_CTL); + + return 0; +} + +static int dwi_bl_get_brightness(struct backlight_device *bl) +{ + struct apple_dwi_bl *dwi_bl = bl_get_data(bl); + + u32 cmd = readl(dwi_bl->base + DWI_BL_CMD); + + return FIELD_GET(DWI_BL_CMD_DATA, cmd); +} + +static const struct backlight_ops dwi_bl_ops = { + .options = BL_CORE_SUSPENDRESUME, + .get_brightness = dwi_bl_get_brightness, + .update_status = dwi_bl_update_status +}; + +static int dwi_bl_probe(struct platform_device *dev) +{ + struct apple_dwi_bl *dwi_bl; + struct backlight_device *bl; + struct backlight_properties props; + struct resource *res; + + dwi_bl = devm_kzalloc(&dev->dev, sizeof(struct apple_dwi_bl), GFP_KERNEL); + if (!dwi_bl) + return -ENOMEM; + + res = platform_get_resource(dev, IORESOURCE_MEM, 0); + if (!res) + return -ENXIO; + + dwi_bl->base = devm_ioremap_resource(&dev->dev, res); + + memset(&props, 0, sizeof(struct backlight_properties)); + props.type = BACKLIGHT_RAW; + props.max_brightness = DWI_BL_MAX_BRIGHTNESS; + + bl = devm_backlight_device_register(&dev->dev, dev->name, &dev->dev, + dwi_bl, &dwi_bl_ops, &props); + + if (IS_ERR(bl)) + return PTR_ERR(bl); + + platform_set_drvdata(dev, dwi_bl); + + bl->props.brightness = dwi_bl_get_brightness(bl); + + return 0; +} + +static const struct of_device_id dwi_bl_of_match[] = { + { .compatible = "apple,dwi-bl" }, + {}, +}; + +MODULE_DEVICE_TABLE(of, dwi_bl_of_match); + +static struct platform_driver dwi_bl_driver = { + .driver = { + .name = "dwi-bl", + .of_match_table = dwi_bl_of_match + }, + .probe = dwi_bl_probe, +}; + +module_platform_driver(dwi_bl_driver); + +MODULE_DESCRIPTION("Apple DWI Backlight Driver"); +MODULE_AUTHOR("Nick Chan <towinchenmi@gmail.com>"); +MODULE_LICENSE("Dual MIT/GPL");
Add driver for backlight controllers attached via Apple DWI 2-wire interface, which is found on some Apple iPhones, iPads and iPod touches with a LCD display. Signed-off-by: Nick Chan <towinchenmi@gmail.com> --- drivers/video/backlight/Kconfig | 12 +++ drivers/video/backlight/Makefile | 1 + drivers/video/backlight/dwi_bl.c | 123 +++++++++++++++++++++++++++++++ 3 files changed, 136 insertions(+) create mode 100644 drivers/video/backlight/dwi_bl.c