powerpc/pseries: Fix to handle slb resize across migration
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / leds / leds-gpio.c
blobd2109054de858b95402ee7d0489704561d6750a2
1 /*
2 * LEDs driver for GPIOs
4 * Copyright (C) 2007 8D Technologies inc.
5 * Raphael Assenat <raph@8d.com>
6 * Copyright (C) 2008 Freescale Semiconductor, Inc.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <linux/platform_device.h>
16 #include <linux/leds.h>
17 #include <linux/workqueue.h>
19 #include <asm/gpio.h>
21 struct gpio_led_data {
22 struct led_classdev cdev;
23 unsigned gpio;
24 struct work_struct work;
25 u8 new_level;
26 u8 can_sleep;
27 u8 active_low;
28 int (*platform_gpio_blink_set)(unsigned gpio,
29 unsigned long *delay_on, unsigned long *delay_off);
32 static void gpio_led_work(struct work_struct *work)
34 struct gpio_led_data *led_dat =
35 container_of(work, struct gpio_led_data, work);
37 gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level);
40 static void gpio_led_set(struct led_classdev *led_cdev,
41 enum led_brightness value)
43 struct gpio_led_data *led_dat =
44 container_of(led_cdev, struct gpio_led_data, cdev);
45 int level;
47 if (value == LED_OFF)
48 level = 0;
49 else
50 level = 1;
52 if (led_dat->active_low)
53 level = !level;
55 /* Setting GPIOs with I2C/etc requires a task context, and we don't
56 * seem to have a reliable way to know if we're already in one; so
57 * let's just assume the worst.
59 if (led_dat->can_sleep) {
60 led_dat->new_level = level;
61 schedule_work(&led_dat->work);
62 } else
63 gpio_set_value(led_dat->gpio, level);
66 static int gpio_blink_set(struct led_classdev *led_cdev,
67 unsigned long *delay_on, unsigned long *delay_off)
69 struct gpio_led_data *led_dat =
70 container_of(led_cdev, struct gpio_led_data, cdev);
72 return led_dat->platform_gpio_blink_set(led_dat->gpio, delay_on, delay_off);
75 static int __devinit create_gpio_led(const struct gpio_led *template,
76 struct gpio_led_data *led_dat, struct device *parent,
77 int (*blink_set)(unsigned, unsigned long *, unsigned long *))
79 int ret;
81 /* skip leds that aren't available */
82 if (!gpio_is_valid(template->gpio)) {
83 printk(KERN_INFO "Skipping unavilable LED gpio %d (%s)\n",
84 template->gpio, template->name);
85 return 0;
88 ret = gpio_request(template->gpio, template->name);
89 if (ret < 0)
90 return ret;
92 led_dat->cdev.name = template->name;
93 led_dat->cdev.default_trigger = template->default_trigger;
94 led_dat->gpio = template->gpio;
95 led_dat->can_sleep = gpio_cansleep(template->gpio);
96 led_dat->active_low = template->active_low;
97 if (blink_set) {
98 led_dat->platform_gpio_blink_set = blink_set;
99 led_dat->cdev.blink_set = gpio_blink_set;
101 led_dat->cdev.brightness_set = gpio_led_set;
102 led_dat->cdev.brightness = LED_OFF;
103 if (!template->retain_state_suspended)
104 led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
106 ret = gpio_direction_output(led_dat->gpio, led_dat->active_low);
107 if (ret < 0)
108 goto err;
110 INIT_WORK(&led_dat->work, gpio_led_work);
112 ret = led_classdev_register(parent, &led_dat->cdev);
113 if (ret < 0)
114 goto err;
116 return 0;
117 err:
118 gpio_free(led_dat->gpio);
119 return ret;
122 static void delete_gpio_led(struct gpio_led_data *led)
124 if (!gpio_is_valid(led->gpio))
125 return;
126 led_classdev_unregister(&led->cdev);
127 cancel_work_sync(&led->work);
128 gpio_free(led->gpio);
131 #ifdef CONFIG_LEDS_GPIO_PLATFORM
132 static int gpio_led_probe(struct platform_device *pdev)
134 struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
135 struct gpio_led_data *leds_data;
136 int i, ret = 0;
138 if (!pdata)
139 return -EBUSY;
141 leds_data = kzalloc(sizeof(struct gpio_led_data) * pdata->num_leds,
142 GFP_KERNEL);
143 if (!leds_data)
144 return -ENOMEM;
146 for (i = 0; i < pdata->num_leds; i++) {
147 ret = create_gpio_led(&pdata->leds[i], &leds_data[i],
148 &pdev->dev, pdata->gpio_blink_set);
149 if (ret < 0)
150 goto err;
153 platform_set_drvdata(pdev, leds_data);
155 return 0;
157 err:
158 for (i = i - 1; i >= 0; i--)
159 delete_gpio_led(&leds_data[i]);
161 kfree(leds_data);
163 return ret;
166 static int __devexit gpio_led_remove(struct platform_device *pdev)
168 int i;
169 struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
170 struct gpio_led_data *leds_data;
172 leds_data = platform_get_drvdata(pdev);
174 for (i = 0; i < pdata->num_leds; i++)
175 delete_gpio_led(&leds_data[i]);
177 kfree(leds_data);
179 return 0;
182 static struct platform_driver gpio_led_driver = {
183 .probe = gpio_led_probe,
184 .remove = __devexit_p(gpio_led_remove),
185 .driver = {
186 .name = "leds-gpio",
187 .owner = THIS_MODULE,
191 MODULE_ALIAS("platform:leds-gpio");
192 #endif /* CONFIG_LEDS_GPIO_PLATFORM */
194 /* Code to create from OpenFirmware platform devices */
195 #ifdef CONFIG_LEDS_GPIO_OF
196 #include <linux/of_platform.h>
197 #include <linux/of_gpio.h>
199 struct gpio_led_of_platform_data {
200 int num_leds;
201 struct gpio_led_data led_data[];
204 static int __devinit of_gpio_leds_probe(struct of_device *ofdev,
205 const struct of_device_id *match)
207 struct device_node *np = ofdev->node, *child;
208 struct gpio_led led;
209 struct gpio_led_of_platform_data *pdata;
210 int count = 0, ret;
212 /* count LEDs defined by this device, so we know how much to allocate */
213 for_each_child_of_node(np, child)
214 count++;
215 if (!count)
216 return 0; /* or ENODEV? */
218 pdata = kzalloc(sizeof(*pdata) + sizeof(struct gpio_led_data) * count,
219 GFP_KERNEL);
220 if (!pdata)
221 return -ENOMEM;
223 memset(&led, 0, sizeof(led));
224 for_each_child_of_node(np, child) {
225 enum of_gpio_flags flags;
227 led.gpio = of_get_gpio_flags(child, 0, &flags);
228 led.active_low = flags & OF_GPIO_ACTIVE_LOW;
229 led.name = of_get_property(child, "label", NULL) ? : child->name;
230 led.default_trigger =
231 of_get_property(child, "linux,default-trigger", NULL);
233 ret = create_gpio_led(&led, &pdata->led_data[pdata->num_leds++],
234 &ofdev->dev, NULL);
235 if (ret < 0) {
236 of_node_put(child);
237 goto err;
241 dev_set_drvdata(&ofdev->dev, pdata);
243 return 0;
245 err:
246 for (count = pdata->num_leds - 2; count >= 0; count--)
247 delete_gpio_led(&pdata->led_data[count]);
249 kfree(pdata);
251 return ret;
254 static int __devexit of_gpio_leds_remove(struct of_device *ofdev)
256 struct gpio_led_of_platform_data *pdata = dev_get_drvdata(&ofdev->dev);
257 int i;
259 for (i = 0; i < pdata->num_leds; i++)
260 delete_gpio_led(&pdata->led_data[i]);
262 kfree(pdata);
264 dev_set_drvdata(&ofdev->dev, NULL);
266 return 0;
269 static const struct of_device_id of_gpio_leds_match[] = {
270 { .compatible = "gpio-leds", },
274 static struct of_platform_driver of_gpio_leds_driver = {
275 .driver = {
276 .name = "of_gpio_leds",
277 .owner = THIS_MODULE,
279 .match_table = of_gpio_leds_match,
280 .probe = of_gpio_leds_probe,
281 .remove = __devexit_p(of_gpio_leds_remove),
283 #endif
285 static int __init gpio_led_init(void)
287 int ret;
289 #ifdef CONFIG_LEDS_GPIO_PLATFORM
290 ret = platform_driver_register(&gpio_led_driver);
291 if (ret)
292 return ret;
293 #endif
294 #ifdef CONFIG_LEDS_GPIO_OF
295 ret = of_register_platform_driver(&of_gpio_leds_driver);
296 #endif
297 #ifdef CONFIG_LEDS_GPIO_PLATFORM
298 if (ret)
299 platform_driver_unregister(&gpio_led_driver);
300 #endif
302 return ret;
305 static void __exit gpio_led_exit(void)
307 #ifdef CONFIG_LEDS_GPIO_PLATFORM
308 platform_driver_unregister(&gpio_led_driver);
309 #endif
310 #ifdef CONFIG_LEDS_GPIO_OF
311 of_unregister_platform_driver(&of_gpio_leds_driver);
312 #endif
315 module_init(gpio_led_init);
316 module_exit(gpio_led_exit);
318 MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>");
319 MODULE_DESCRIPTION("GPIO LED driver");
320 MODULE_LICENSE("GPL");