diff options
| -rw-r--r-- | drivers/video/backlight/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/video/backlight/Makefile | 1 | ||||
| -rw-r--r-- | drivers/video/backlight/rave-sp-backlight.c | 82 | ||||
| -rw-r--r-- | include/linux/mfd/rave-sp.h | 1 |
4 files changed, 90 insertions, 0 deletions
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 4e1d2ad50ba1..5d2d0d7e8100 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -467,6 +467,12 @@ config BACKLIGHT_ARCXCNN If you have an ARCxCnnnn family backlight say Y to enable the backlight driver. +config BACKLIGHT_RAVE_SP + tristate "RAVE SP Backlight driver" + depends on RAVE_SP_CORE + help + Support for backlight control on RAVE SP device. + endif # BACKLIGHT_CLASS_DEVICE endif # BACKLIGHT_LCD_SUPPORT diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 5e28f01c8391..19da71d518bf 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -57,3 +57,4 @@ obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o obj-$(CONFIG_BACKLIGHT_TPS65217) += tps65217_bl.o obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o obj-$(CONFIG_BACKLIGHT_ARCXCNN) += arcxcnn_bl.o +obj-$(CONFIG_BACKLIGHT_RAVE_SP) += rave-sp-backlight.o diff --git a/drivers/video/backlight/rave-sp-backlight.c b/drivers/video/backlight/rave-sp-backlight.c new file mode 100644 index 000000000000..462f14a1b19d --- /dev/null +++ b/drivers/video/backlight/rave-sp-backlight.c @@ -0,0 +1,82 @@ +// SPDX-License-Identifier: GPL-2.0+ + +/* + * LCD Backlight driver for RAVE SP + * + * Copyright (C) 2018 Zodiac Inflight Innovations + * + */ + +#include <linux/backlight.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mfd/rave-sp.h> +#include <linux/platform_device.h> + +#define RAVE_SP_BACKLIGHT_LCD_EN BIT(7) + +static int rave_sp_backlight_update_status(struct backlight_device *bd) +{ + const struct backlight_properties *p = &bd->props; + const u8 intensity = + (p->power == FB_BLANK_UNBLANK) ? p->brightness : 0; + struct rave_sp *sp = dev_get_drvdata(&bd->dev); + u8 cmd[] = { + [0] = RAVE_SP_CMD_SET_BACKLIGHT, + [1] = 0, + [2] = intensity ? RAVE_SP_BACKLIGHT_LCD_EN | intensity : 0, + [3] = 0, + [4] = 0, + }; + + return rave_sp_exec(sp, cmd, sizeof(cmd), NULL, 0); +} + +static const struct backlight_ops rave_sp_backlight_ops = { + .options = BL_CORE_SUSPENDRESUME, + .update_status = rave_sp_backlight_update_status, +}; + +static struct backlight_properties rave_sp_backlight_props = { + .type = BACKLIGHT_PLATFORM, + .max_brightness = 100, + .brightness = 50, +}; + +static int rave_sp_backlight_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct backlight_device *bd; + + bd = devm_backlight_device_register(dev, pdev->name, dev->parent, + dev_get_drvdata(dev->parent), + &rave_sp_backlight_ops, + &rave_sp_backlight_props); + if (IS_ERR(bd)) + return PTR_ERR(bd); + + backlight_update_status(bd); + + return 0; +} + +static const struct of_device_id rave_sp_backlight_of_match[] = { + { .compatible = "zii,rave-sp-backlight" }, + {} +}; + +static struct platform_driver rave_sp_backlight_driver = { + .probe = rave_sp_backlight_probe, + .driver = { + .name = KBUILD_MODNAME, + .of_match_table = rave_sp_backlight_of_match, + }, +}; +module_platform_driver(rave_sp_backlight_driver); + +MODULE_DEVICE_TABLE(of, rave_sp_backlight_of_match); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>"); +MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>"); +MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>"); +MODULE_DESCRIPTION("RAVE SP Backlight driver"); diff --git a/include/linux/mfd/rave-sp.h b/include/linux/mfd/rave-sp.h index 796fb9794c9e..fe0ce7bc59cf 100644 --- a/include/linux/mfd/rave-sp.h +++ b/include/linux/mfd/rave-sp.h @@ -21,6 +21,7 @@ enum rave_sp_command { RAVE_SP_CMD_STATUS = 0xA0, RAVE_SP_CMD_SW_WDT = 0xA1, RAVE_SP_CMD_PET_WDT = 0xA2, + RAVE_SP_CMD_SET_BACKLIGHT = 0xA6, RAVE_SP_CMD_RESET = 0xA7, RAVE_SP_CMD_RESET_REASON = 0xA8, |