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1 | /* |
2 | * LEDs driver for GPIOs |
3 | * |
4 | * Copyright (C) 2007 8D Technologies inc. |
5 | * Raphael Assenat <raph@8d.com> |
6 | * Copyright (C) 2008 Freescale Semiconductor, Inc. |
7 | * |
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. |
11 | * |
12 | */ |
13 | #include <linux/kernel.h> |
14 | #include <linux/init.h> |
15 | #include <linux/platform_device.h> |
16 | #include <linux/leds.h> |
17 | #include <linux/slab.h> |
18 | #include <linux/workqueue.h> |
19 | |
20 | #include <asm/gpio.h> |
21 | |
22 | struct gpio_led_data { |
23 | struct led_classdev cdev; |
24 | unsigned gpio; |
25 | struct work_struct work; |
26 | u8 new_level; |
27 | u8 can_sleep; |
28 | u8 active_low; |
29 | u8 blinking; |
30 | int (*platform_gpio_blink_set)(unsigned gpio, int state, |
31 | unsigned long *delay_on, unsigned long *delay_off); |
32 | }; |
33 | |
34 | static void gpio_led_work(struct work_struct *work) |
35 | { |
36 | struct gpio_led_data *led_dat = |
37 | container_of(work, struct gpio_led_data, work); |
38 | |
39 | if (led_dat->blinking) { |
40 | led_dat->platform_gpio_blink_set(led_dat->gpio, |
41 | led_dat->new_level, |
42 | NULL, NULL); |
43 | led_dat->blinking = 0; |
44 | } else |
45 | gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level); |
46 | } |
47 | |
48 | static void gpio_led_set(struct led_classdev *led_cdev, |
49 | enum led_brightness value) |
50 | { |
51 | struct gpio_led_data *led_dat = |
52 | container_of(led_cdev, struct gpio_led_data, cdev); |
53 | int level; |
54 | |
55 | if (value == LED_OFF) |
56 | level = 0; |
57 | else |
58 | level = 1; |
59 | |
60 | if (led_dat->active_low) |
61 | level = !level; |
62 | |
63 | /* Setting GPIOs with I2C/etc requires a task context, and we don't |
64 | * seem to have a reliable way to know if we're already in one; so |
65 | * let's just assume the worst. |
66 | */ |
67 | if (led_dat->can_sleep) { |
68 | led_dat->new_level = level; |
69 | schedule_work(&led_dat->work); |
70 | } else { |
71 | if (led_dat->blinking) { |
72 | led_dat->platform_gpio_blink_set(led_dat->gpio, level, |
73 | NULL, NULL); |
74 | led_dat->blinking = 0; |
75 | } else |
76 | gpio_set_value(led_dat->gpio, level); |
77 | } |
78 | } |
79 | |
80 | static int gpio_blink_set(struct led_classdev *led_cdev, |
81 | unsigned long *delay_on, unsigned long *delay_off) |
82 | { |
83 | struct gpio_led_data *led_dat = |
84 | container_of(led_cdev, struct gpio_led_data, cdev); |
85 | |
86 | led_dat->blinking = 1; |
87 | return led_dat->platform_gpio_blink_set(led_dat->gpio, GPIO_LED_BLINK, |
88 | delay_on, delay_off); |
89 | } |
90 | |
91 | static int __devinit create_gpio_led(const struct gpio_led *template, |
92 | struct gpio_led_data *led_dat, struct device *parent, |
93 | int (*blink_set)(unsigned, int, unsigned long *, unsigned long *)) |
94 | { |
95 | int ret, state; |
96 | |
97 | led_dat->gpio = -1; |
98 | |
99 | /* skip leds that aren't available */ |
100 | if (!gpio_is_valid(template->gpio)) { |
101 | printk(KERN_INFO "Skipping unavailable LED gpio %d (%s)\n", |
102 | template->gpio, template->name); |
103 | return 0; |
104 | } |
105 | |
106 | ret = gpio_request(template->gpio, template->name); |
107 | if (ret < 0) |
108 | return ret; |
109 | |
110 | led_dat->cdev.name = template->name; |
111 | led_dat->cdev.default_trigger = template->default_trigger; |
112 | led_dat->gpio = template->gpio; |
113 | led_dat->can_sleep = gpio_cansleep(template->gpio); |
114 | led_dat->active_low = template->active_low; |
115 | led_dat->blinking = 0; |
116 | if (blink_set) { |
117 | led_dat->platform_gpio_blink_set = blink_set; |
118 | led_dat->cdev.blink_set = gpio_blink_set; |
119 | } |
120 | led_dat->cdev.brightness_set = gpio_led_set; |
121 | if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) |
122 | state = !!gpio_get_value(led_dat->gpio) ^ led_dat->active_low; |
123 | else |
124 | state = (template->default_state == LEDS_GPIO_DEFSTATE_ON); |
125 | led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; |
126 | if (!template->retain_state_suspended) |
127 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; |
128 | |
129 | ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state); |
130 | if (ret < 0) |
131 | goto err; |
132 | |
133 | INIT_WORK(&led_dat->work, gpio_led_work); |
134 | |
135 | ret = led_classdev_register(parent, &led_dat->cdev); |
136 | if (ret < 0) |
137 | goto err; |
138 | |
139 | return 0; |
140 | err: |
141 | gpio_free(led_dat->gpio); |
142 | return ret; |
143 | } |
144 | |
145 | static void delete_gpio_led(struct gpio_led_data *led) |
146 | { |
147 | if (!gpio_is_valid(led->gpio)) |
148 | return; |
149 | led_classdev_unregister(&led->cdev); |
150 | cancel_work_sync(&led->work); |
151 | gpio_free(led->gpio); |
152 | } |
153 | |
154 | #ifdef CONFIG_LEDS_GPIO_PLATFORM |
155 | static int __devinit gpio_led_probe(struct platform_device *pdev) |
156 | { |
157 | struct gpio_led_platform_data *pdata = pdev->dev.platform_data; |
158 | struct gpio_led_data *leds_data; |
159 | int i, ret = 0; |
160 | |
161 | if (!pdata) |
162 | return -EBUSY; |
163 | |
164 | leds_data = kzalloc(sizeof(struct gpio_led_data) * pdata->num_leds, |
165 | GFP_KERNEL); |
166 | if (!leds_data) |
167 | return -ENOMEM; |
168 | |
169 | for (i = 0; i < pdata->num_leds; i++) { |
170 | ret = create_gpio_led(&pdata->leds[i], &leds_data[i], |
171 | &pdev->dev, pdata->gpio_blink_set); |
172 | if (ret < 0) |
173 | goto err; |
174 | } |
175 | |
176 | platform_set_drvdata(pdev, leds_data); |
177 | |
178 | return 0; |
179 | |
180 | err: |
181 | for (i = i - 1; i >= 0; i--) |
182 | delete_gpio_led(&leds_data[i]); |
183 | |
184 | kfree(leds_data); |
185 | |
186 | return ret; |
187 | } |
188 | |
189 | static int __devexit gpio_led_remove(struct platform_device *pdev) |
190 | { |
191 | int i; |
192 | struct gpio_led_platform_data *pdata = pdev->dev.platform_data; |
193 | struct gpio_led_data *leds_data; |
194 | |
195 | leds_data = platform_get_drvdata(pdev); |
196 | |
197 | for (i = 0; i < pdata->num_leds; i++) |
198 | delete_gpio_led(&leds_data[i]); |
199 | |
200 | kfree(leds_data); |
201 | |
202 | return 0; |
203 | } |
204 | |
205 | static struct platform_driver gpio_led_driver = { |
206 | .probe = gpio_led_probe, |
207 | .remove = __devexit_p(gpio_led_remove), |
208 | .driver = { |
209 | .name = "leds-gpio", |
210 | .owner = THIS_MODULE, |
211 | }, |
212 | }; |
213 | |
214 | MODULE_ALIAS("platform:leds-gpio"); |
215 | #endif /* CONFIG_LEDS_GPIO_PLATFORM */ |
216 | |
217 | /* Code to create from OpenFirmware platform devices */ |
218 | #ifdef CONFIG_LEDS_GPIO_OF |
219 | #include <linux/of_platform.h> |
220 | #include <linux/of_gpio.h> |
221 | |
222 | struct gpio_led_of_platform_data { |
223 | int num_leds; |
224 | struct gpio_led_data led_data[]; |
225 | }; |
226 | |
227 | static int __devinit of_gpio_leds_probe(struct platform_device *ofdev, |
228 | const struct of_device_id *match) |
229 | { |
230 | struct device_node *np = ofdev->dev.of_node, *child; |
231 | struct gpio_led_of_platform_data *pdata; |
232 | int count = 0, ret; |
233 | |
234 | /* count LEDs defined by this device, so we know how much to allocate */ |
235 | for_each_child_of_node(np, child) |
236 | count++; |
237 | if (!count) |
238 | return 0; /* or ENODEV? */ |
239 | |
240 | pdata = kzalloc(sizeof(*pdata) + sizeof(struct gpio_led_data) * count, |
241 | GFP_KERNEL); |
242 | if (!pdata) |
243 | return -ENOMEM; |
244 | |
245 | for_each_child_of_node(np, child) { |
246 | struct gpio_led led = {}; |
247 | enum of_gpio_flags flags; |
248 | const char *state; |
249 | |
250 | led.gpio = of_get_gpio_flags(child, 0, &flags); |
251 | led.active_low = flags & OF_GPIO_ACTIVE_LOW; |
252 | led.name = of_get_property(child, "label", NULL) ? : child->name; |
253 | led.default_trigger = |
254 | of_get_property(child, "linux,default-trigger", NULL); |
255 | state = of_get_property(child, "default-state", NULL); |
256 | if (state) { |
257 | if (!strcmp(state, "keep")) |
258 | led.default_state = LEDS_GPIO_DEFSTATE_KEEP; |
259 | else if(!strcmp(state, "on")) |
260 | led.default_state = LEDS_GPIO_DEFSTATE_ON; |
261 | else |
262 | led.default_state = LEDS_GPIO_DEFSTATE_OFF; |
263 | } |
264 | |
265 | ret = create_gpio_led(&led, &pdata->led_data[pdata->num_leds++], |
266 | &ofdev->dev, NULL); |
267 | if (ret < 0) { |
268 | of_node_put(child); |
269 | goto err; |
270 | } |
271 | } |
272 | |
273 | dev_set_drvdata(&ofdev->dev, pdata); |
274 | |
275 | return 0; |
276 | |
277 | err: |
278 | for (count = pdata->num_leds - 2; count >= 0; count--) |
279 | delete_gpio_led(&pdata->led_data[count]); |
280 | |
281 | kfree(pdata); |
282 | |
283 | return ret; |
284 | } |
285 | |
286 | static int __devexit of_gpio_leds_remove(struct platform_device *ofdev) |
287 | { |
288 | struct gpio_led_of_platform_data *pdata = dev_get_drvdata(&ofdev->dev); |
289 | int i; |
290 | |
291 | for (i = 0; i < pdata->num_leds; i++) |
292 | delete_gpio_led(&pdata->led_data[i]); |
293 | |
294 | kfree(pdata); |
295 | |
296 | dev_set_drvdata(&ofdev->dev, NULL); |
297 | |
298 | return 0; |
299 | } |
300 | |
301 | static const struct of_device_id of_gpio_leds_match[] = { |
302 | { .compatible = "gpio-leds", }, |
303 | {}, |
304 | }; |
305 | |
306 | static struct of_platform_driver of_gpio_leds_driver = { |
307 | .driver = { |
308 | .name = "of_gpio_leds", |
309 | .owner = THIS_MODULE, |
310 | .of_match_table = of_gpio_leds_match, |
311 | }, |
312 | .probe = of_gpio_leds_probe, |
313 | .remove = __devexit_p(of_gpio_leds_remove), |
314 | }; |
315 | #endif |
316 | |
317 | static int __init gpio_led_init(void) |
318 | { |
319 | int ret = 0; |
320 | |
321 | #ifdef CONFIG_LEDS_GPIO_PLATFORM |
322 | ret = platform_driver_register(&gpio_led_driver); |
323 | if (ret) |
324 | return ret; |
325 | #endif |
326 | #ifdef CONFIG_LEDS_GPIO_OF |
327 | ret = of_register_platform_driver(&of_gpio_leds_driver); |
328 | #endif |
329 | #ifdef CONFIG_LEDS_GPIO_PLATFORM |
330 | if (ret) |
331 | platform_driver_unregister(&gpio_led_driver); |
332 | #endif |
333 | |
334 | return ret; |
335 | } |
336 | |
337 | static void __exit gpio_led_exit(void) |
338 | { |
339 | #ifdef CONFIG_LEDS_GPIO_PLATFORM |
340 | platform_driver_unregister(&gpio_led_driver); |
341 | #endif |
342 | #ifdef CONFIG_LEDS_GPIO_OF |
343 | of_unregister_platform_driver(&of_gpio_leds_driver); |
344 | #endif |
345 | } |
346 | |
347 | module_init(gpio_led_init); |
348 | module_exit(gpio_led_exit); |
349 | |
350 | MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>"); |
351 | MODULE_DESCRIPTION("GPIO LED driver"); |
352 | MODULE_LICENSE("GPL"); |
353 |
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