1 /* 2 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved 3 * Author: Patrick Delaunay <patrick.delaunay@st.com> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <dm.h> 10 #include <backlight.h> 11 #include <asm/gpio.h> 12 13 struct gpio_backlight_priv { 14 struct gpio_desc gpio; 15 bool def_value; 16 }; 17 18 static int gpio_backlight_enable(struct udevice *dev) 19 { 20 struct gpio_backlight_priv *priv = dev_get_priv(dev); 21 22 dm_gpio_set_value(&priv->gpio, 1); 23 24 return 0; 25 } 26 27 static int gpio_backlight_ofdata_to_platdata(struct udevice *dev) 28 { 29 struct gpio_backlight_priv *priv = dev_get_priv(dev); 30 int ret; 31 32 ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio, 33 GPIOD_IS_OUT); 34 if (ret) { 35 debug("%s: Warning: cannot get GPIO: ret=%d\n", 36 __func__, ret); 37 return ret; 38 } 39 40 priv->def_value = dev_read_bool(dev, "default-on"); 41 42 return 0; 43 } 44 45 static int gpio_backlight_probe(struct udevice *dev) 46 { 47 struct gpio_backlight_priv *priv = dev_get_priv(dev); 48 49 if (priv->def_value) 50 gpio_backlight_enable(dev); 51 52 return 0; 53 } 54 55 static const struct backlight_ops gpio_backlight_ops = { 56 .enable = gpio_backlight_enable, 57 }; 58 59 static const struct udevice_id gpio_backlight_ids[] = { 60 { .compatible = "gpio-backlight" }, 61 { } 62 }; 63 64 U_BOOT_DRIVER(gpio_backlight) = { 65 .name = "gpio_backlight", 66 .id = UCLASS_PANEL_BACKLIGHT, 67 .of_match = gpio_backlight_ids, 68 .ops = &gpio_backlight_ops, 69 .ofdata_to_platdata = gpio_backlight_ofdata_to_platdata, 70 .probe = gpio_backlight_probe, 71 .priv_auto_alloc_size = sizeof(struct gpio_backlight_priv), 72 }; 73