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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 | // SPDX-License-Identifier: GPL-2.0+ /* * Copyright (c) 2015 Google, Inc * Written by Simon Glass <sjg@chromium.org> */ #define LOG_CATEGORY UCLASS_LED #include <dm.h> #include <errno.h> #include <led.h> #include <dm/device-internal.h> #include <dm/lists.h> #include <dm/root.h> #include <dm/uclass-internal.h> int led_bind_generic(struct udevice *parent, const char *driver_name) { struct udevice *dev; ofnode node; int ret; dev_for_each_subnode(node, parent) { ret = device_bind_driver_to_node(parent, driver_name, ofnode_get_name(node), node, &dev); if (ret) return ret; } return 0; } int led_get_by_label(const char *label, struct udevice **devp) { struct udevice *dev; struct uclass *uc; int ret; ret = uclass_get(UCLASS_LED, &uc); if (ret) return ret; uclass_foreach_dev(dev, uc) { struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev); /* Ignore the top-level LED node */ if (uc_plat->label && !strcmp(label, uc_plat->label)) return uclass_get_device_tail(dev, 0, devp); } return -ENODEV; } int led_set_state(struct udevice *dev, enum led_state_t state) { struct led_ops *ops = led_get_ops(dev); if (!ops->set_state) return -ENOSYS; if (IS_ENABLED(CONFIG_LED_SW_BLINK) && led_sw_on_state_change(dev, state)) return 0; return ops->set_state(dev, state); } enum led_state_t led_get_state(struct udevice *dev) { struct led_ops *ops = led_get_ops(dev); if (!ops->get_state) return -ENOSYS; if (IS_ENABLED(CONFIG_LED_SW_BLINK) && led_sw_is_blinking(dev)) return LEDST_BLINK; return ops->get_state(dev); } int led_set_period(struct udevice *dev, int period_ms) { #ifdef CONFIG_LED_BLINK struct led_ops *ops = led_get_ops(dev); if (ops->set_period) return ops->set_period(dev, period_ms); #endif if (IS_ENABLED(CONFIG_LED_SW_BLINK)) return led_sw_set_period(dev, period_ms); return -ENOSYS; } static int led_post_bind(struct udevice *dev) { struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev); const char *default_state; if (!uc_plat->label) uc_plat->label = dev_read_string(dev, "label"); if (!uc_plat->label && !dev_read_string(dev, "compatible")) uc_plat->label = ofnode_get_name(dev_ofnode(dev)); uc_plat->default_state = LEDST_COUNT; default_state = dev_read_string(dev, "default-state"); if (!default_state) return 0; if (!strncmp(default_state, "on", 2)) uc_plat->default_state = LEDST_ON; else if (!strncmp(default_state, "off", 3)) uc_plat->default_state = LEDST_OFF; else return 0; if (IS_ENABLED(CONFIG_LED_BLINK)) { const char *trigger; trigger = dev_read_string(dev, "linux,default-trigger"); if (trigger && !strncmp(trigger, "pattern", 7)) uc_plat->default_state = LEDST_BLINK; } /* * In case the LED has default-state DT property, trigger * probe() to configure its default state during startup. */ dev_or_flags(dev, DM_FLAG_PROBE_AFTER_BIND); return 0; } static int led_post_probe(struct udevice *dev) { struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev); int default_period_ms = 1000; int ret = 0; switch (uc_plat->default_state) { case LEDST_ON: case LEDST_OFF: ret = led_set_state(dev, uc_plat->default_state); break; case LEDST_BLINK: ret = led_set_period(dev, default_period_ms); if (!ret) ret = led_set_state(dev, uc_plat->default_state); break; default: break; } return ret; } UCLASS_DRIVER(led) = { .id = UCLASS_LED, .name = "led", .per_device_plat_auto = sizeof(struct led_uc_plat), .post_bind = led_post_bind, .post_probe = led_post_probe, }; |