This is a minimal port of a kernel commit 6552d3141064 ("backlight: Add RAVE SP backlight driver"). All of the changes were kept to a minimum and limited to impedance matching between Barebox/Linux driver API. Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx> --- drivers/video/Kconfig | 7 +++ drivers/video/Makefile | 2 + drivers/video/rave-sp-backlight.c | 72 +++++++++++++++++++++++++++++++ 3 files changed, 81 insertions(+) create mode 100644 drivers/video/rave-sp-backlight.c diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 1dcae48f8..79de32cf8 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -124,6 +124,13 @@ config DRIVER_VIDEO_BACKLIGHT_PWM help Enable this to get support for backlight devices driven by a PWM. +config BACKLIGHT_RAVE_SP + tristate "RAVE SP Backlight driver" + depends on RAVE_SP_CORE + depends on DRIVER_VIDEO_BACKLIGHT + help + Support for backlight control on RAVE SP device. + comment "Video encoder chips" config DRIVER_VIDEO_MTL017 diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 081e4463d..01fabe880 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -23,3 +23,5 @@ obj-$(CONFIG_DRIVER_VIDEO_SIMPLEFB) += simplefb.o obj-$(CONFIG_DRIVER_VIDEO_IMX_IPUV3) += imx-ipu-v3/ obj-$(CONFIG_DRIVER_VIDEO_EFI_GOP) += efi_gop.o obj-$(CONFIG_DRIVER_VIDEO_FB_SSD1307) += ssd1307fb.o +obj-$(CONFIG_BACKLIGHT_RAVE_SP) += rave-sp-backlight.o + diff --git a/drivers/video/rave-sp-backlight.c b/drivers/video/rave-sp-backlight.c new file mode 100644 index 000000000..88ec86e73 --- /dev/null +++ b/drivers/video/rave-sp-backlight.c @@ -0,0 +1,72 @@ +/* + * LCD Backlight driver for RAVE SP + * + * Copyright (C) 2018 Zodiac Inflight Innovations + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include <common.h> +#include <malloc.h> +#include <init.h> +#include <video/backlight.h> +#include <linux/mfd/rave-sp.h> + +#define RAVE_SP_BACKLIGHT_LCD_EN BIT(7) + +static int rave_sp_backlight_set(struct backlight_device *bd, int brightness) +{ + struct rave_sp *sp = bd->dev.priv; + u8 cmd[] = { + [0] = RAVE_SP_CMD_SET_BACKLIGHT, + [1] = 0, + [2] = brightness ? RAVE_SP_BACKLIGHT_LCD_EN | brightness : 0, + [3] = 0, + [4] = 0, + }; + + return rave_sp_exec(sp, cmd, sizeof(cmd), NULL, 0); +} + +static int rave_sp_backlight_probe(struct device_d *dev) +{ + struct backlight_device *bd; + int ret; + + bd = xzalloc(sizeof(*bd)); + bd->dev.priv = dev->parent->priv; + bd->brightness_default = 50; + bd->brightness_max = 100; + bd->brightness_set = rave_sp_backlight_set; + + ret = backlight_register(bd); + if (ret) { + free(bd); + return ret; + } + + return 0; +} + +static const struct of_device_id rave_sp_backlight_of_match[] = { + { .compatible = "zii,rave-sp-backlight" }, + {} +}; + +static struct driver_d rave_sp_backlight_driver = { + .name = "rave-sp-backlight", + .probe = rave_sp_backlight_probe, + .of_compatible = DRV_OF_COMPAT(rave_sp_backlight_of_match), +}; +device_platform_driver(rave_sp_backlight_driver); -- 2.17.1 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox