118 lines
2.4 KiB
C
118 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#define LOG_CATEGORY UCLASS_LED
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <led.h>
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#include <dm/device-internal.h>
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#include <dm/root.h>
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#include <dm/uclass-internal.h>
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int led_get_by_label(const char *label, struct udevice **devp)
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{
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struct udevice *dev;
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struct uclass *uc;
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int ret;
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ret = uclass_get(UCLASS_LED, &uc);
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if (ret)
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return ret;
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uclass_foreach_dev(dev, uc) {
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struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev);
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/* Ignore the top-level LED node */
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if (uc_plat->label && !strcmp(label, uc_plat->label))
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return uclass_get_device_tail(dev, 0, devp);
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}
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return -ENODEV;
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}
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int led_set_state(struct udevice *dev, enum led_state_t state)
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{
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struct led_ops *ops = led_get_ops(dev);
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if (!ops->set_state)
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return -ENOSYS;
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return ops->set_state(dev, state);
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}
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enum led_state_t led_get_state(struct udevice *dev)
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{
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struct led_ops *ops = led_get_ops(dev);
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if (!ops->get_state)
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return -ENOSYS;
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return ops->get_state(dev);
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}
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#ifdef CONFIG_LED_BLINK
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int led_set_period(struct udevice *dev, int period_ms)
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{
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struct led_ops *ops = led_get_ops(dev);
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if (!ops->set_period)
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return -ENOSYS;
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return ops->set_period(dev, period_ms);
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}
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#endif
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static int led_post_bind(struct udevice *dev)
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{
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struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev);
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const char *default_state;
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uc_plat->label = dev_read_string(dev, "label");
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if (!uc_plat->label)
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uc_plat->label = ofnode_get_name(dev_ofnode(dev));
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uc_plat->default_state = LEDST_COUNT;
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default_state = dev_read_string(dev, "default-state");
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if (!default_state)
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return 0;
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if (!strncmp(default_state, "on", 2))
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uc_plat->default_state = LEDST_ON;
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else if (!strncmp(default_state, "off", 3))
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uc_plat->default_state = LEDST_OFF;
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else
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return 0;
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/*
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* In case the LED has default-state DT property, trigger
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* probe() to configure its default state during startup.
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*/
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dev_or_flags(dev, DM_FLAG_PROBE_AFTER_BIND);
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return 0;
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}
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static int led_post_probe(struct udevice *dev)
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{
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struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev);
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if (uc_plat->default_state == LEDST_ON ||
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uc_plat->default_state == LEDST_OFF)
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led_set_state(dev, uc_plat->default_state);
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return 0;
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}
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UCLASS_DRIVER(led) = {
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.id = UCLASS_LED,
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.name = "led",
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.per_device_plat_auto = sizeof(struct led_uc_plat),
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.post_bind = led_post_bind,
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.post_probe = led_post_probe,
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};
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