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![Denis Osterland-Heim](/assets/img/avatar_default.png)
This patch introduces a new function to read initial default_state from fwnode. Suggested-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Denis Osterland-Heim <Denis.Osterland@diehl.com> Signed-off-by: Pavel Machek <pavel@ucw.cz>
313 lines
7.9 KiB
C
313 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* LEDs driver for GPIOs
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*
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* Copyright (C) 2007 8D Technologies inc.
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* Raphael Assenat <raph@8d.com>
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* Copyright (C) 2008 Freescale Semiconductor, Inc.
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*/
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/kernel.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/slab.h>
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#include "leds.h"
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struct gpio_led_data {
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struct led_classdev cdev;
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struct gpio_desc *gpiod;
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u8 can_sleep;
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u8 blinking;
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gpio_blink_set_t platform_gpio_blink_set;
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};
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static inline struct gpio_led_data *
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cdev_to_gpio_led_data(struct led_classdev *led_cdev)
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{
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return container_of(led_cdev, struct gpio_led_data, cdev);
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}
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static void gpio_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct gpio_led_data *led_dat = cdev_to_gpio_led_data(led_cdev);
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int level;
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if (value == LED_OFF)
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level = 0;
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else
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level = 1;
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if (led_dat->blinking) {
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led_dat->platform_gpio_blink_set(led_dat->gpiod, level,
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NULL, NULL);
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led_dat->blinking = 0;
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} else {
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if (led_dat->can_sleep)
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gpiod_set_value_cansleep(led_dat->gpiod, level);
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else
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gpiod_set_value(led_dat->gpiod, level);
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}
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}
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static int gpio_led_set_blocking(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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gpio_led_set(led_cdev, value);
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return 0;
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}
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static int gpio_blink_set(struct led_classdev *led_cdev,
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unsigned long *delay_on, unsigned long *delay_off)
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{
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struct gpio_led_data *led_dat = cdev_to_gpio_led_data(led_cdev);
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led_dat->blinking = 1;
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return led_dat->platform_gpio_blink_set(led_dat->gpiod, GPIO_LED_BLINK,
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delay_on, delay_off);
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}
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static int create_gpio_led(const struct gpio_led *template,
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struct gpio_led_data *led_dat, struct device *parent,
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struct fwnode_handle *fwnode, gpio_blink_set_t blink_set)
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{
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struct led_init_data init_data = {};
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int ret, state;
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led_dat->cdev.default_trigger = template->default_trigger;
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led_dat->can_sleep = gpiod_cansleep(led_dat->gpiod);
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if (!led_dat->can_sleep)
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led_dat->cdev.brightness_set = gpio_led_set;
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else
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led_dat->cdev.brightness_set_blocking = gpio_led_set_blocking;
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led_dat->blinking = 0;
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if (blink_set) {
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led_dat->platform_gpio_blink_set = blink_set;
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led_dat->cdev.blink_set = gpio_blink_set;
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}
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if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) {
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state = gpiod_get_value_cansleep(led_dat->gpiod);
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if (state < 0)
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return state;
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} else {
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state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
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}
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led_dat->cdev.brightness = state;
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led_dat->cdev.max_brightness = 1;
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if (!template->retain_state_suspended)
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led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
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if (template->panic_indicator)
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led_dat->cdev.flags |= LED_PANIC_INDICATOR;
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if (template->retain_state_shutdown)
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led_dat->cdev.flags |= LED_RETAIN_AT_SHUTDOWN;
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ret = gpiod_direction_output(led_dat->gpiod, state);
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if (ret < 0)
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return ret;
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if (template->name) {
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led_dat->cdev.name = template->name;
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ret = devm_led_classdev_register(parent, &led_dat->cdev);
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} else {
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init_data.fwnode = fwnode;
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ret = devm_led_classdev_register_ext(parent, &led_dat->cdev,
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&init_data);
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}
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return ret;
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}
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struct gpio_leds_priv {
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int num_leds;
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struct gpio_led_data leds[];
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};
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static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct fwnode_handle *child;
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struct gpio_leds_priv *priv;
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int count, ret;
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count = device_get_child_node_count(dev);
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if (!count)
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return ERR_PTR(-ENODEV);
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priv = devm_kzalloc(dev, struct_size(priv, leds, count), GFP_KERNEL);
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if (!priv)
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return ERR_PTR(-ENOMEM);
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device_for_each_child_node(dev, child) {
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struct gpio_led_data *led_dat = &priv->leds[priv->num_leds];
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struct gpio_led led = {};
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/*
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* Acquire gpiod from DT with uninitialized label, which
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* will be updated after LED class device is registered,
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* Only then the final LED name is known.
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*/
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led.gpiod = devm_fwnode_get_gpiod_from_child(dev, NULL, child,
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GPIOD_ASIS,
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NULL);
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if (IS_ERR(led.gpiod)) {
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fwnode_handle_put(child);
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return ERR_CAST(led.gpiod);
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}
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led_dat->gpiod = led.gpiod;
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led.default_state = led_init_default_state_get(child);
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if (fwnode_property_present(child, "retain-state-suspended"))
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led.retain_state_suspended = 1;
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if (fwnode_property_present(child, "retain-state-shutdown"))
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led.retain_state_shutdown = 1;
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if (fwnode_property_present(child, "panic-indicator"))
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led.panic_indicator = 1;
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ret = create_gpio_led(&led, led_dat, dev, child, NULL);
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if (ret < 0) {
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fwnode_handle_put(child);
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return ERR_PTR(ret);
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}
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/* Set gpiod label to match the corresponding LED name. */
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gpiod_set_consumer_name(led_dat->gpiod,
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led_dat->cdev.dev->kobj.name);
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priv->num_leds++;
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}
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return priv;
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}
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static const struct of_device_id of_gpio_leds_match[] = {
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{ .compatible = "gpio-leds", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_gpio_leds_match);
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static struct gpio_desc *gpio_led_get_gpiod(struct device *dev, int idx,
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const struct gpio_led *template)
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{
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struct gpio_desc *gpiod;
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unsigned long flags = GPIOF_OUT_INIT_LOW;
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int ret;
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/*
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* This means the LED does not come from the device tree
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* or ACPI, so let's try just getting it by index from the
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* device, this will hit the board file, if any and get
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* the GPIO from there.
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*/
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gpiod = devm_gpiod_get_index(dev, NULL, idx, GPIOD_OUT_LOW);
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if (!IS_ERR(gpiod)) {
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gpiod_set_consumer_name(gpiod, template->name);
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return gpiod;
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}
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if (PTR_ERR(gpiod) != -ENOENT)
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return gpiod;
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/*
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* This is the legacy code path for platform code that
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* still uses GPIO numbers. Ultimately we would like to get
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* rid of this block completely.
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*/
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/* skip leds that aren't available */
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if (!gpio_is_valid(template->gpio))
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return ERR_PTR(-ENOENT);
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if (template->active_low)
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flags |= GPIOF_ACTIVE_LOW;
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ret = devm_gpio_request_one(dev, template->gpio, flags,
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template->name);
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if (ret < 0)
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return ERR_PTR(ret);
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gpiod = gpio_to_desc(template->gpio);
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if (!gpiod)
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return ERR_PTR(-EINVAL);
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return gpiod;
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}
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static int gpio_led_probe(struct platform_device *pdev)
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{
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struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
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struct gpio_leds_priv *priv;
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int i, ret = 0;
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if (pdata && pdata->num_leds) {
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priv = devm_kzalloc(&pdev->dev, struct_size(priv, leds, pdata->num_leds),
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GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->num_leds = pdata->num_leds;
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for (i = 0; i < priv->num_leds; i++) {
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const struct gpio_led *template = &pdata->leds[i];
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struct gpio_led_data *led_dat = &priv->leds[i];
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if (template->gpiod)
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led_dat->gpiod = template->gpiod;
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else
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led_dat->gpiod =
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gpio_led_get_gpiod(&pdev->dev,
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i, template);
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if (IS_ERR(led_dat->gpiod)) {
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dev_info(&pdev->dev, "Skipping unavailable LED gpio %d (%s)\n",
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template->gpio, template->name);
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continue;
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}
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ret = create_gpio_led(template, led_dat,
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&pdev->dev, NULL,
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pdata->gpio_blink_set);
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if (ret < 0)
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return ret;
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}
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} else {
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priv = gpio_leds_create(pdev);
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if (IS_ERR(priv))
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return PTR_ERR(priv);
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}
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platform_set_drvdata(pdev, priv);
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return 0;
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}
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static void gpio_led_shutdown(struct platform_device *pdev)
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{
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struct gpio_leds_priv *priv = platform_get_drvdata(pdev);
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int i;
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for (i = 0; i < priv->num_leds; i++) {
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struct gpio_led_data *led = &priv->leds[i];
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if (!(led->cdev.flags & LED_RETAIN_AT_SHUTDOWN))
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gpio_led_set(&led->cdev, LED_OFF);
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}
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}
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static struct platform_driver gpio_led_driver = {
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.probe = gpio_led_probe,
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.shutdown = gpio_led_shutdown,
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.driver = {
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.name = "leds-gpio",
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.of_match_table = of_gpio_leds_match,
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},
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};
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module_platform_driver(gpio_led_driver);
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MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>");
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MODULE_DESCRIPTION("GPIO LED driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:leds-gpio");
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