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path: root/drivers/leds/leds-gpio.c
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Diffstat (limited to 'drivers/leds/leds-gpio.c')
-rw-r--r--drivers/leds/leds-gpio.c153
1 files changed, 77 insertions, 76 deletions
diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index 998f2ff6914d..a3428b22de3a 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -1,25 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* LEDs driver for GPIOs
*
* Copyright (C) 2007 8D Technologies inc.
* Raphael Assenat <raph@8d.com>
* Copyright (C) 2008 Freescale Semiconductor, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
*/
+#include <linux/container_of.h>
+#include <linux/device.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
-#include <linux/kernel.h>
#include <linux/leds.h>
+#include <linux/mod_devicetable.h>
#include <linux/module.h>
-#include <linux/of.h>
+#include <linux/overflow.h>
+#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/slab.h>
+#include <linux/types.h>
struct gpio_led_data {
struct led_classdev cdev;
@@ -77,11 +77,12 @@ static int gpio_blink_set(struct led_classdev *led_cdev,
static int create_gpio_led(const struct gpio_led *template,
struct gpio_led_data *led_dat, struct device *parent,
- struct device_node *np, gpio_blink_set_t blink_set)
+ struct fwnode_handle *fwnode, gpio_blink_set_t blink_set)
{
+ struct led_init_data init_data = {};
+ struct pinctrl *pinctrl;
int ret, state;
- led_dat->cdev.name = template->name;
led_dat->cdev.default_trigger = template->default_trigger;
led_dat->can_sleep = gpiod_cansleep(led_dat->gpiod);
if (!led_dat->can_sleep)
@@ -100,7 +101,8 @@ static int create_gpio_led(const struct gpio_led *template,
} else {
state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
}
- led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
+ led_dat->cdev.brightness = state;
+ led_dat->cdev.max_brightness = 1;
if (!template->retain_state_suspended)
led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
if (template->panic_indicator)
@@ -112,71 +114,71 @@ static int create_gpio_led(const struct gpio_led *template,
if (ret < 0)
return ret;
- return devm_of_led_classdev_register(parent, np, &led_dat->cdev);
+ if (template->name) {
+ led_dat->cdev.name = template->name;
+ ret = devm_led_classdev_register(parent, &led_dat->cdev);
+ } else {
+ init_data.fwnode = fwnode;
+ ret = devm_led_classdev_register_ext(parent, &led_dat->cdev,
+ &init_data);
+ }
+
+ if (ret)
+ return ret;
+
+ pinctrl = devm_pinctrl_get_select_default(led_dat->cdev.dev);
+ ret = PTR_ERR_OR_ZERO(pinctrl);
+ /* pinctrl-%d not present, not an error */
+ if (ret == -ENODEV)
+ ret = 0;
+ if (ret) {
+ dev_warn(led_dat->cdev.dev, "Failed to select %pfw pinctrl: %d\n",
+ fwnode, ret);
+ }
+
+ return ret;
}
struct gpio_leds_priv {
int num_leds;
- struct gpio_led_data leds[];
+ struct gpio_led_data leds[] __counted_by(num_leds);
};
-static inline int sizeof_gpio_leds_priv(int num_leds)
-{
- return sizeof(struct gpio_leds_priv) +
- (sizeof(struct gpio_led_data) * num_leds);
-}
-
-static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
+static struct gpio_leds_priv *gpio_leds_create(struct device *dev)
{
- struct device *dev = &pdev->dev;
- struct fwnode_handle *child;
struct gpio_leds_priv *priv;
- int count, ret;
+ int count, used, ret;
count = device_get_child_node_count(dev);
if (!count)
return ERR_PTR(-ENODEV);
- priv = devm_kzalloc(dev, sizeof_gpio_leds_priv(count), GFP_KERNEL);
+ priv = devm_kzalloc(dev, struct_size(priv, leds, count), GFP_KERNEL);
if (!priv)
return ERR_PTR(-ENOMEM);
+ priv->num_leds = count;
+ used = 0;
- device_for_each_child_node(dev, child) {
- struct gpio_led_data *led_dat = &priv->leds[priv->num_leds];
+ device_for_each_child_node_scoped(dev, child) {
+ struct gpio_led_data *led_dat = &priv->leds[used];
struct gpio_led led = {};
- const char *state = NULL;
- struct device_node *np = to_of_node(child);
-
- ret = fwnode_property_read_string(child, "label", &led.name);
- if (ret && IS_ENABLED(CONFIG_OF) && np)
- led.name = np->name;
- if (!led.name) {
- fwnode_handle_put(child);
- return ERR_PTR(-EINVAL);
- }
- led.gpiod = devm_fwnode_get_gpiod_from_child(dev, NULL, child,
- GPIOD_ASIS,
- led.name);
+ /*
+ * Acquire gpiod from DT with uninitialized label, which
+ * will be updated after LED class device is registered,
+ * Only then the final LED name is known.
+ */
+ led.gpiod = devm_fwnode_gpiod_get(dev, child, NULL, GPIOD_ASIS,
+ NULL);
if (IS_ERR(led.gpiod)) {
- fwnode_handle_put(child);
+ dev_err_probe(dev, PTR_ERR(led.gpiod), "Failed to get GPIO '%pfw'\n",
+ child);
return ERR_CAST(led.gpiod);
}
led_dat->gpiod = led.gpiod;
- fwnode_property_read_string(child, "linux,default-trigger",
- &led.default_trigger);
-
- if (!fwnode_property_read_string(child, "default-state",
- &state)) {
- if (!strcmp(state, "keep"))
- led.default_state = LEDS_GPIO_DEFSTATE_KEEP;
- else if (!strcmp(state, "on"))
- led.default_state = LEDS_GPIO_DEFSTATE_ON;
- else
- led.default_state = LEDS_GPIO_DEFSTATE_OFF;
- }
+ led.default_state = led_init_default_state_get(child);
if (fwnode_property_present(child, "retain-state-suspended"))
led.retain_state_suspended = 1;
@@ -185,13 +187,16 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
if (fwnode_property_present(child, "panic-indicator"))
led.panic_indicator = 1;
- ret = create_gpio_led(&led, led_dat, dev, np, NULL);
- if (ret < 0) {
- fwnode_handle_put(child);
+ ret = create_gpio_led(&led, led_dat, dev, child, NULL);
+ if (ret < 0)
return ERR_PTR(ret);
- }
- priv->num_leds++;
+
+ /* Set gpiod label to match the corresponding LED name. */
+ gpiod_set_consumer_name(led_dat->gpiod,
+ led_dat->cdev.dev->kobj.name);
+ used++;
}
+ priv->num_leds = used;
return priv;
}
@@ -207,7 +212,6 @@ static struct gpio_desc *gpio_led_get_gpiod(struct device *dev, int idx,
const struct gpio_led *template)
{
struct gpio_desc *gpiod;
- unsigned long flags = GPIOF_OUT_INIT_LOW;
int ret;
/*
@@ -216,13 +220,13 @@ static struct gpio_desc *gpio_led_get_gpiod(struct device *dev, int idx,
* device, this will hit the board file, if any and get
* the GPIO from there.
*/
- gpiod = devm_gpiod_get_index(dev, NULL, idx, flags);
- if (!IS_ERR(gpiod)) {
+ gpiod = devm_gpiod_get_index_optional(dev, NULL, idx, GPIOD_OUT_LOW);
+ if (IS_ERR(gpiod))
+ return gpiod;
+ if (gpiod) {
gpiod_set_consumer_name(gpiod, template->name);
return gpiod;
}
- if (PTR_ERR(gpiod) != -ENOENT)
- return gpiod;
/*
* This is the legacy code path for platform code that
@@ -234,10 +238,7 @@ static struct gpio_desc *gpio_led_get_gpiod(struct device *dev, int idx,
if (!gpio_is_valid(template->gpio))
return ERR_PTR(-ENOENT);
- if (template->active_low)
- flags |= GPIOF_ACTIVE_LOW;
-
- ret = devm_gpio_request_one(dev, template->gpio, flags,
+ ret = devm_gpio_request_one(dev, template->gpio, GPIOF_OUT_INIT_LOW,
template->name);
if (ret < 0)
return ERR_PTR(ret);
@@ -246,19 +247,21 @@ static struct gpio_desc *gpio_led_get_gpiod(struct device *dev, int idx,
if (!gpiod)
return ERR_PTR(-EINVAL);
+ if (template->active_low ^ gpiod_is_active_low(gpiod))
+ gpiod_toggle_active_low(gpiod);
+
return gpiod;
}
static int gpio_led_probe(struct platform_device *pdev)
{
- struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ struct device *dev = &pdev->dev;
+ struct gpio_led_platform_data *pdata = dev_get_platdata(dev);
struct gpio_leds_priv *priv;
- int i, ret = 0;
+ int i, ret;
if (pdata && pdata->num_leds) {
- priv = devm_kzalloc(&pdev->dev,
- sizeof_gpio_leds_priv(pdata->num_leds),
- GFP_KERNEL);
+ priv = devm_kzalloc(dev, struct_size(priv, leds, pdata->num_leds), GFP_KERNEL);
if (!priv)
return -ENOMEM;
@@ -271,22 +274,20 @@ static int gpio_led_probe(struct platform_device *pdev)
led_dat->gpiod = template->gpiod;
else
led_dat->gpiod =
- gpio_led_get_gpiod(&pdev->dev,
- i, template);
+ gpio_led_get_gpiod(dev, i, template);
if (IS_ERR(led_dat->gpiod)) {
- dev_info(&pdev->dev, "Skipping unavailable LED gpio %d (%s)\n",
+ dev_info(dev, "Skipping unavailable LED gpio %d (%s)\n",
template->gpio, template->name);
continue;
}
- ret = create_gpio_led(template, led_dat,
- &pdev->dev, NULL,
+ ret = create_gpio_led(template, led_dat, dev, NULL,
pdata->gpio_blink_set);
if (ret < 0)
return ret;
}
} else {
- priv = gpio_leds_create(pdev);
+ priv = gpio_leds_create(dev);
if (IS_ERR(priv))
return PTR_ERR(priv);
}
generated by cgit (git 2.34.1) at 2025-12-24 21:49:18 +0000