/* * 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->dev.parent = dev; 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);