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drivers/leds/leds-gpio.c
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/* * LEDs driver for GPIOs * * Copyright (C) 2007 8D Technologies inc. * Raphael Assenat <raph@8d.com> |
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* Copyright (C) 2008 Freescale Semiconductor, Inc. |
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* * 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/kernel.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/leds.h> |
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#include <linux/of_platform.h> #include <linux/of_gpio.h> |
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#include <linux/slab.h> |
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#include <linux/workqueue.h> |
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#include <linux/module.h> |
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#include <asm/gpio.h> struct gpio_led_data { struct led_classdev cdev; unsigned gpio; |
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struct work_struct work; u8 new_level; u8 can_sleep; |
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u8 active_low; |
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u8 blinking; int (*platform_gpio_blink_set)(unsigned gpio, int state, |
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unsigned long *delay_on, unsigned long *delay_off); |
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}; |
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static void gpio_led_work(struct work_struct *work) { struct gpio_led_data *led_dat = container_of(work, struct gpio_led_data, work); |
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if (led_dat->blinking) { led_dat->platform_gpio_blink_set(led_dat->gpio, led_dat->new_level, NULL, NULL); led_dat->blinking = 0; } else gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level); |
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} |
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static void gpio_led_set(struct led_classdev *led_cdev, enum led_brightness value) { struct gpio_led_data *led_dat = container_of(led_cdev, struct gpio_led_data, cdev); int level; if (value == LED_OFF) level = 0; else level = 1; if (led_dat->active_low) level = !level; |
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/* Setting GPIOs with I2C/etc requires a task context, and we don't * seem to have a reliable way to know if we're already in one; so * let's just assume the worst. */ |
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if (led_dat->can_sleep) { |
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led_dat->new_level = level; schedule_work(&led_dat->work); |
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} else { if (led_dat->blinking) { led_dat->platform_gpio_blink_set(led_dat->gpio, level, NULL, NULL); led_dat->blinking = 0; } else gpio_set_value(led_dat->gpio, level); } |
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} |
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static int gpio_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on, unsigned long *delay_off) { struct gpio_led_data *led_dat = container_of(led_cdev, struct gpio_led_data, cdev); |
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led_dat->blinking = 1; return led_dat->platform_gpio_blink_set(led_dat->gpio, GPIO_LED_BLINK, delay_on, delay_off); |
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} |
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static int __devinit create_gpio_led(const struct gpio_led *template, struct gpio_led_data *led_dat, struct device *parent, |
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int (*blink_set)(unsigned, int, unsigned long *, unsigned long *)) |
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{ |
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int ret, state; |
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led_dat->gpio = -1; |
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/* skip leds that aren't available */ if (!gpio_is_valid(template->gpio)) { |
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printk(KERN_INFO "Skipping unavailable LED gpio %d (%s) ", |
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template->gpio, template->name); |
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return 0; |
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} |
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ret = gpio_request(template->gpio, template->name); if (ret < 0) return ret; led_dat->cdev.name = template->name; led_dat->cdev.default_trigger = template->default_trigger; led_dat->gpio = template->gpio; led_dat->can_sleep = gpio_cansleep(template->gpio); led_dat->active_low = template->active_low; |
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led_dat->blinking = 0; |
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if (blink_set) { led_dat->platform_gpio_blink_set = blink_set; led_dat->cdev.blink_set = gpio_blink_set; } led_dat->cdev.brightness_set = gpio_led_set; |
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if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) |
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state = !!gpio_get_value_cansleep(led_dat->gpio) ^ led_dat->active_low; |
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else state = (template->default_state == LEDS_GPIO_DEFSTATE_ON); led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; |
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if (!template->retain_state_suspended) led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; |
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ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state); |
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if (ret < 0) goto err; |
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INIT_WORK(&led_dat->work, gpio_led_work); ret = led_classdev_register(parent, &led_dat->cdev); if (ret < 0) goto err; return 0; err: gpio_free(led_dat->gpio); return ret; } static void delete_gpio_led(struct gpio_led_data *led) { |
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if (!gpio_is_valid(led->gpio)) return; |
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led_classdev_unregister(&led->cdev); cancel_work_sync(&led->work); gpio_free(led->gpio); } |
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struct gpio_leds_priv { int num_leds; struct gpio_led_data leds[]; }; |
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static inline int sizeof_gpio_leds_priv(int num_leds) |
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{ |
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return sizeof(struct gpio_leds_priv) + (sizeof(struct gpio_led_data) * num_leds); |
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} |
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/* Code to create from OpenFirmware platform devices */ |
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#ifdef CONFIG_OF_GPIO |
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static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev) |
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{ |
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struct device_node *np = pdev->dev.of_node, *child; struct gpio_leds_priv *priv; |
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int count = 0, ret; |
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/* count LEDs in this device, so we know how much to allocate */ |
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for_each_child_of_node(np, child) count++; if (!count) |
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return NULL; |
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priv = kzalloc(sizeof_gpio_leds_priv(count), GFP_KERNEL); if (!priv) return NULL; |
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for_each_child_of_node(np, child) { |
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struct gpio_led led = {}; |
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enum of_gpio_flags flags; |
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const char *state; |
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led.gpio = of_get_gpio_flags(child, 0, &flags); led.active_low = flags & OF_GPIO_ACTIVE_LOW; led.name = of_get_property(child, "label", NULL) ? : child->name; led.default_trigger = of_get_property(child, "linux,default-trigger", NULL); |
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state = of_get_property(child, "default-state", NULL); if (state) { if (!strcmp(state, "keep")) led.default_state = LEDS_GPIO_DEFSTATE_KEEP; |
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else if (!strcmp(state, "on")) |
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led.default_state = LEDS_GPIO_DEFSTATE_ON; else led.default_state = LEDS_GPIO_DEFSTATE_OFF; } |
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ret = create_gpio_led(&led, &priv->leds[priv->num_leds++], &pdev->dev, NULL); |
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if (ret < 0) { of_node_put(child); goto err; } } |
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return priv; |
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err: |
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for (count = priv->num_leds - 2; count >= 0; count--) delete_gpio_led(&priv->leds[count]); kfree(priv); return NULL; } |
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static const struct of_device_id of_gpio_leds_match[] = { { .compatible = "gpio-leds", }, {}, }; |
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#else /* CONFIG_OF_GPIO */ |
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static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev) { return NULL; } #define of_gpio_leds_match NULL |
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#endif /* CONFIG_OF_GPIO */ |
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static int __devinit gpio_led_probe(struct platform_device *pdev) { struct gpio_led_platform_data *pdata = pdev->dev.platform_data; struct gpio_leds_priv *priv; int i, ret = 0; if (pdata && pdata->num_leds) { priv = kzalloc(sizeof_gpio_leds_priv(pdata->num_leds), GFP_KERNEL); if (!priv) return -ENOMEM; priv->num_leds = pdata->num_leds; for (i = 0; i < priv->num_leds; i++) { ret = create_gpio_led(&pdata->leds[i], &priv->leds[i], &pdev->dev, pdata->gpio_blink_set); if (ret < 0) { /* On failure: unwind the led creations */ for (i = i - 1; i >= 0; i--) delete_gpio_led(&priv->leds[i]); kfree(priv); return ret; } } } else { priv = gpio_leds_create_of(pdev); if (!priv) return -ENODEV; } platform_set_drvdata(pdev, priv); return 0; |
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} |
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static int __devexit gpio_led_remove(struct platform_device *pdev) |
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{ |
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struct gpio_leds_priv *priv = dev_get_drvdata(&pdev->dev); |
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int i; |
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for (i = 0; i < priv->num_leds; i++) delete_gpio_led(&priv->leds[i]); |
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dev_set_drvdata(&pdev->dev, NULL); kfree(priv); |
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return 0; } |
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static struct platform_driver gpio_led_driver = { .probe = gpio_led_probe, .remove = __devexit_p(gpio_led_remove), .driver = { .name = "leds-gpio", .owner = THIS_MODULE, |
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.of_match_table = of_gpio_leds_match, |
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}, |
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}; |
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MODULE_ALIAS("platform:leds-gpio"); |
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static int __init gpio_led_init(void) |
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{ |
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return platform_driver_register(&gpio_led_driver); |
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} |
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static void __exit gpio_led_exit(void) |
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{ |
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platform_driver_unregister(&gpio_led_driver); |
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} module_init(gpio_led_init); module_exit(gpio_led_exit); |
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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"); MODULE_LICENSE("GPL"); |