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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 | // 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; } #ifdef CONFIG_LED_BOOT static int led_boot_get(struct udevice **devp, int *period_ms) { struct led_uc_priv *priv; struct uclass *uc; int ret; ret = uclass_get(UCLASS_LED, &uc); if (ret) return ret; priv = uclass_get_priv(uc); if (!priv->boot_led_label) return -ENOENT; if (period_ms) *period_ms = priv->boot_led_period; return led_get_by_label(priv->boot_led_label, devp); } int led_boot_on(void) { struct udevice *dev; int ret; ret = led_boot_get(&dev, NULL); if (ret) return ret; return led_set_state(dev, LEDST_ON); } int led_boot_off(void) { struct udevice *dev; int ret; ret = led_boot_get(&dev, NULL); if (ret) return ret; return led_set_state(dev, LEDST_OFF); } #if defined(CONFIG_LED_BLINK) || defined(CONFIG_LED_SW_BLINK) int led_boot_blink(void) { struct udevice *dev; int period_ms, ret; ret = led_boot_get(&dev, &period_ms); if (ret) return ret; ret = led_set_period(dev, period_ms); if (ret) { if (ret != -ENOSYS) return ret; /* fallback to ON with no set_period and no SW_BLINK */ return led_set_state(dev, LEDST_ON); } return led_set_state(dev, LEDST_BLINK); } #endif #endif #ifdef CONFIG_LED_ACTIVITY static int led_activity_get(struct udevice **devp, int *period_ms) { struct led_uc_priv *priv; struct uclass *uc; int ret; ret = uclass_get(UCLASS_LED, &uc); if (ret) return ret; priv = uclass_get_priv(uc); if (!priv->activity_led_label) return -ENOENT; if (period_ms) *period_ms = priv->activity_led_period; return led_get_by_label(priv->activity_led_label, devp); } int led_activity_on(void) { struct udevice *dev; int ret; ret = led_activity_get(&dev, NULL); if (ret) return ret; return led_set_state(dev, LEDST_ON); } int led_activity_off(void) { struct udevice *dev; int ret; ret = led_activity_get(&dev, NULL); if (ret) return ret; return led_set_state(dev, LEDST_OFF); } #if defined(CONFIG_LED_BLINK) || defined(CONFIG_LED_SW_BLINK) int led_activity_blink(void) { struct udevice *dev; int period_ms, ret; ret = led_activity_get(&dev, &period_ms); if (ret) return ret; ret = led_set_period(dev, period_ms); if (ret) { if (ret != -ENOSYS) return ret; /* fallback to ON with no set_period and no SW_BLINK */ return led_set_state(dev, LEDST_ON); } return led_set_state(dev, LEDST_BLINK); } #endif #endif static const char *led_get_label(ofnode node) { const char *label; label = ofnode_read_string(node, "label"); if (!label && !ofnode_read_string(node, "compatible")) label = ofnode_get_name(node); return label; } 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 = led_get_label(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; } #if defined(CONFIG_LED_BOOT) || defined(CONFIG_LED_ACTIVITY) static int led_init(struct uclass *uc) { struct led_uc_priv *priv = uclass_get_priv(uc); ofnode led_node; int ret; #ifdef CONFIG_LED_BOOT ret = ofnode_options_get_by_phandle("boot-led", &led_node); if (!ret) priv->boot_led_label = led_get_label(led_node); priv->boot_led_period = ofnode_options_read_int("boot-led-period-ms", 250); #endif #ifdef CONFIG_LED_ACTIVITY ret = ofnode_options_get_by_phandle("activity-led", &led_node); if (!ret) priv->activity_led_label = led_get_label(led_node); priv->activity_led_period = ofnode_options_read_int("activity-led-period-ms", 250); #endif return 0; } #endif 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, #if defined(CONFIG_LED_BOOT) || defined(CONFIG_LED_ACTIVITY) .init = led_init, .priv_auto = sizeof(struct led_uc_priv), #endif }; |