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328 lines
8.5 KiB
328 lines
8.5 KiB
// 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 <[email protected]> |
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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 if (led_dat->cdev.flags & SET_GPIO_INPUT) { |
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gpiod_direction_input(led_dat->gpiod); |
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led_dat->cdev.flags &= ~SET_GPIO_INPUT; |
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} else if (led_dat->cdev.flags & SET_GPIO_OUTPUT) { |
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gpiod_direction_output(led_dat->gpiod, level); |
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led_dat->cdev.flags &= ~SET_GPIO_OUTPUT; |
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} else { |
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if (led_dat->can_sleep || |
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(led_dat->cdev.flags & (SET_GPIO_INPUT | SET_GPIO_OUTPUT) )) |
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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 enum led_brightness gpio_led_get(struct led_classdev *led_cdev) |
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{ |
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struct gpio_led_data *led_dat = |
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container_of(led_cdev, struct gpio_led_data, cdev); |
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return gpiod_get_value_cansleep(led_dat->gpiod) ? LED_FULL : LED_OFF; |
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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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led_dat->cdev.brightness_get = gpio_led_get; |
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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 <[email protected]>, Trent Piepho <[email protected]>"); |
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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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