mirror of
https://github.com/AsahiLinux/u-boot
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9413ad4f0d
Add support for toggling an LED into the uclass interface. This can be efficiently implemented by the driver. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Ziping Chen <techping.chan@gmail.com>
136 lines
2.8 KiB
C
136 lines
2.8 KiB
C
/*
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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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* SPDX-License-Identifier: GPL-2.0+
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*/
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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 <asm/gpio.h>
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#include <dm/lists.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct led_gpio_priv {
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struct gpio_desc gpio;
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};
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static int gpio_led_set_state(struct udevice *dev, enum led_state_t state)
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{
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struct led_gpio_priv *priv = dev_get_priv(dev);
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int ret;
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if (!dm_gpio_is_valid(&priv->gpio))
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return -EREMOTEIO;
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switch (state) {
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case LEDST_OFF:
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case LEDST_ON:
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break;
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case LEDST_TOGGLE:
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ret = dm_gpio_get_value(&priv->gpio);
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if (ret < 0)
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return ret;
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state = !ret;
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break;
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default:
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return -ENOSYS;
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}
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return dm_gpio_set_value(&priv->gpio, state);
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}
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static enum led_state_t gpio_led_get_state(struct udevice *dev)
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{
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struct led_gpio_priv *priv = dev_get_priv(dev);
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int ret;
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if (!dm_gpio_is_valid(&priv->gpio))
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return -EREMOTEIO;
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ret = dm_gpio_get_value(&priv->gpio);
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if (ret < 0)
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return ret;
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return ret ? LEDST_ON : LEDST_OFF;
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}
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static int led_gpio_probe(struct udevice *dev)
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{
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struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
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struct led_gpio_priv *priv = dev_get_priv(dev);
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/* Ignore the top-level LED node */
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if (!uc_plat->label)
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return 0;
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return gpio_request_by_name(dev, "gpios", 0, &priv->gpio, GPIOD_IS_OUT);
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}
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static int led_gpio_remove(struct udevice *dev)
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{
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/*
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* The GPIO driver may have already been removed. We will need to
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* address this more generally.
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*/
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#ifndef CONFIG_SANDBOX
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struct led_gpio_priv *priv = dev_get_priv(dev);
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if (dm_gpio_is_valid(&priv->gpio))
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dm_gpio_free(dev, &priv->gpio);
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#endif
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return 0;
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}
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static int led_gpio_bind(struct udevice *parent)
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{
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const void *blob = gd->fdt_blob;
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struct udevice *dev;
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int node;
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int ret;
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for (node = fdt_first_subnode(blob, dev_of_offset(parent));
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node > 0;
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node = fdt_next_subnode(blob, node)) {
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struct led_uc_plat *uc_plat;
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const char *label;
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label = fdt_getprop(blob, node, "label", NULL);
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if (!label) {
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debug("%s: node %s has no label\n", __func__,
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fdt_get_name(blob, node, NULL));
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return -EINVAL;
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}
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ret = device_bind_driver_to_node(parent, "gpio_led",
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fdt_get_name(blob, node, NULL),
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node, &dev);
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if (ret)
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return ret;
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uc_plat = dev_get_uclass_platdata(dev);
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uc_plat->label = label;
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}
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return 0;
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}
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static const struct led_ops gpio_led_ops = {
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.set_state = gpio_led_set_state,
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.get_state = gpio_led_get_state,
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};
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static const struct udevice_id led_gpio_ids[] = {
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{ .compatible = "gpio-leds" },
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{ }
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};
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U_BOOT_DRIVER(led_gpio) = {
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.name = "gpio_led",
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.id = UCLASS_LED,
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.of_match = led_gpio_ids,
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.ops = &gpio_led_ops,
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.priv_auto_alloc_size = sizeof(struct led_gpio_priv),
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.bind = led_gpio_bind,
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.probe = led_gpio_probe,
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.remove = led_gpio_remove,
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};
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