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// 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
};
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