Commit | Line | Data |
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22e03f3b RA |
1 | /* |
2 | * LEDs driver for GPIOs | |
3 | * | |
4 | * Copyright (C) 2007 8D Technologies inc. | |
5 | * Raphael Assenat <raph@8d.com> | |
a7d878af | 6 | * Copyright (C) 2008 Freescale Semiconductor, Inc. |
22e03f3b RA |
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> | |
00852279 DB |
17 | #include <linux/workqueue.h> |
18 | ||
22e03f3b RA |
19 | #include <asm/gpio.h> |
20 | ||
21 | struct gpio_led_data { | |
22 | struct led_classdev cdev; | |
23 | unsigned gpio; | |
00852279 DB |
24 | struct work_struct work; |
25 | u8 new_level; | |
26 | u8 can_sleep; | |
22e03f3b | 27 | u8 active_low; |
ca3259b3 HVR |
28 | int (*platform_gpio_blink_set)(unsigned gpio, |
29 | unsigned long *delay_on, unsigned long *delay_off); | |
22e03f3b RA |
30 | }; |
31 | ||
00852279 DB |
32 | static void gpio_led_work(struct work_struct *work) |
33 | { | |
34 | struct gpio_led_data *led_dat = | |
35 | container_of(work, struct gpio_led_data, work); | |
36 | ||
37 | gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level); | |
38 | } | |
22e03f3b RA |
39 | |
40 | static void gpio_led_set(struct led_classdev *led_cdev, | |
41 | enum led_brightness value) | |
42 | { | |
43 | struct gpio_led_data *led_dat = | |
44 | container_of(led_cdev, struct gpio_led_data, cdev); | |
45 | int level; | |
46 | ||
47 | if (value == LED_OFF) | |
48 | level = 0; | |
49 | else | |
50 | level = 1; | |
51 | ||
52 | if (led_dat->active_low) | |
53 | level = !level; | |
54 | ||
306dd85c DB |
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. | |
58 | */ | |
00852279 | 59 | if (led_dat->can_sleep) { |
306dd85c DB |
60 | led_dat->new_level = level; |
61 | schedule_work(&led_dat->work); | |
00852279 DB |
62 | } else |
63 | gpio_set_value(led_dat->gpio, level); | |
22e03f3b RA |
64 | } |
65 | ||
ca3259b3 HVR |
66 | static int gpio_blink_set(struct led_classdev *led_cdev, |
67 | unsigned long *delay_on, unsigned long *delay_off) | |
68 | { | |
69 | struct gpio_led_data *led_dat = | |
70 | container_of(led_cdev, struct gpio_led_data, cdev); | |
71 | ||
72 | return led_dat->platform_gpio_blink_set(led_dat->gpio, delay_on, delay_off); | |
73 | } | |
74 | ||
a7d878af TP |
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 *)) | |
78 | { | |
ed88bae6 | 79 | int ret, state; |
a7d878af | 80 | |
d379ee8a DB |
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); | |
ac15e950 | 85 | return 0; |
d379ee8a DB |
86 | } |
87 | ||
a7d878af TP |
88 | ret = gpio_request(template->gpio, template->name); |
89 | if (ret < 0) | |
90 | return ret; | |
91 | ||
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; | |
100 | } | |
101 | led_dat->cdev.brightness_set = gpio_led_set; | |
ed88bae6 TP |
102 | if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) |
103 | state = !!gpio_get_value(led_dat->gpio) ^ led_dat->active_low; | |
104 | else | |
105 | state = (template->default_state == LEDS_GPIO_DEFSTATE_ON); | |
106 | led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; | |
defb512d RP |
107 | if (!template->retain_state_suspended) |
108 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; | |
a7d878af | 109 | |
ed88bae6 | 110 | ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state); |
a7d878af TP |
111 | if (ret < 0) |
112 | goto err; | |
113 | ||
114 | INIT_WORK(&led_dat->work, gpio_led_work); | |
115 | ||
116 | ret = led_classdev_register(parent, &led_dat->cdev); | |
117 | if (ret < 0) | |
118 | goto err; | |
119 | ||
120 | return 0; | |
121 | err: | |
122 | gpio_free(led_dat->gpio); | |
123 | return ret; | |
124 | } | |
125 | ||
126 | static void delete_gpio_led(struct gpio_led_data *led) | |
127 | { | |
d379ee8a DB |
128 | if (!gpio_is_valid(led->gpio)) |
129 | return; | |
a7d878af TP |
130 | led_classdev_unregister(&led->cdev); |
131 | cancel_work_sync(&led->work); | |
132 | gpio_free(led->gpio); | |
133 | } | |
134 | ||
135 | #ifdef CONFIG_LEDS_GPIO_PLATFORM | |
7fd02170 | 136 | static int __devinit gpio_led_probe(struct platform_device *pdev) |
22e03f3b RA |
137 | { |
138 | struct gpio_led_platform_data *pdata = pdev->dev.platform_data; | |
a7d878af | 139 | struct gpio_led_data *leds_data; |
22e03f3b RA |
140 | int i, ret = 0; |
141 | ||
142 | if (!pdata) | |
143 | return -EBUSY; | |
144 | ||
145 | leds_data = kzalloc(sizeof(struct gpio_led_data) * pdata->num_leds, | |
146 | GFP_KERNEL); | |
147 | if (!leds_data) | |
148 | return -ENOMEM; | |
149 | ||
150 | for (i = 0; i < pdata->num_leds; i++) { | |
a7d878af TP |
151 | ret = create_gpio_led(&pdata->leds[i], &leds_data[i], |
152 | &pdev->dev, pdata->gpio_blink_set); | |
d95cbe61 UKK |
153 | if (ret < 0) |
154 | goto err; | |
22e03f3b RA |
155 | } |
156 | ||
157 | platform_set_drvdata(pdev, leds_data); | |
158 | ||
159 | return 0; | |
160 | ||
161 | err: | |
a7d878af TP |
162 | for (i = i - 1; i >= 0; i--) |
163 | delete_gpio_led(&leds_data[i]); | |
00852279 | 164 | |
22e03f3b RA |
165 | kfree(leds_data); |
166 | ||
167 | return ret; | |
168 | } | |
169 | ||
199fb21d | 170 | static int __devexit gpio_led_remove(struct platform_device *pdev) |
22e03f3b RA |
171 | { |
172 | int i; | |
173 | struct gpio_led_platform_data *pdata = pdev->dev.platform_data; | |
174 | struct gpio_led_data *leds_data; | |
175 | ||
176 | leds_data = platform_get_drvdata(pdev); | |
177 | ||
a7d878af TP |
178 | for (i = 0; i < pdata->num_leds; i++) |
179 | delete_gpio_led(&leds_data[i]); | |
199fb21d | 180 | |
22e03f3b RA |
181 | kfree(leds_data); |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
22e03f3b | 186 | static struct platform_driver gpio_led_driver = { |
199fb21d DB |
187 | .probe = gpio_led_probe, |
188 | .remove = __devexit_p(gpio_led_remove), | |
22e03f3b RA |
189 | .driver = { |
190 | .name = "leds-gpio", | |
191 | .owner = THIS_MODULE, | |
192 | }, | |
193 | }; | |
194 | ||
a7d878af TP |
195 | MODULE_ALIAS("platform:leds-gpio"); |
196 | #endif /* CONFIG_LEDS_GPIO_PLATFORM */ | |
197 | ||
198 | /* Code to create from OpenFirmware platform devices */ | |
199 | #ifdef CONFIG_LEDS_GPIO_OF | |
200 | #include <linux/of_platform.h> | |
201 | #include <linux/of_gpio.h> | |
202 | ||
203 | struct gpio_led_of_platform_data { | |
204 | int num_leds; | |
205 | struct gpio_led_data led_data[]; | |
206 | }; | |
207 | ||
208 | static int __devinit of_gpio_leds_probe(struct of_device *ofdev, | |
209 | const struct of_device_id *match) | |
210 | { | |
211 | struct device_node *np = ofdev->node, *child; | |
212 | struct gpio_led led; | |
213 | struct gpio_led_of_platform_data *pdata; | |
214 | int count = 0, ret; | |
215 | ||
216 | /* count LEDs defined by this device, so we know how much to allocate */ | |
217 | for_each_child_of_node(np, child) | |
218 | count++; | |
219 | if (!count) | |
220 | return 0; /* or ENODEV? */ | |
221 | ||
222 | pdata = kzalloc(sizeof(*pdata) + sizeof(struct gpio_led_data) * count, | |
223 | GFP_KERNEL); | |
224 | if (!pdata) | |
225 | return -ENOMEM; | |
226 | ||
227 | memset(&led, 0, sizeof(led)); | |
228 | for_each_child_of_node(np, child) { | |
229 | enum of_gpio_flags flags; | |
ed88bae6 | 230 | const char *state; |
a7d878af TP |
231 | |
232 | led.gpio = of_get_gpio_flags(child, 0, &flags); | |
233 | led.active_low = flags & OF_GPIO_ACTIVE_LOW; | |
234 | led.name = of_get_property(child, "label", NULL) ? : child->name; | |
235 | led.default_trigger = | |
236 | of_get_property(child, "linux,default-trigger", NULL); | |
ed88bae6 TP |
237 | state = of_get_property(child, "default-state", NULL); |
238 | if (state) { | |
239 | if (!strcmp(state, "keep")) | |
240 | led.default_state = LEDS_GPIO_DEFSTATE_KEEP; | |
241 | else if(!strcmp(state, "on")) | |
242 | led.default_state = LEDS_GPIO_DEFSTATE_ON; | |
243 | else | |
244 | led.default_state = LEDS_GPIO_DEFSTATE_OFF; | |
245 | } | |
a7d878af TP |
246 | |
247 | ret = create_gpio_led(&led, &pdata->led_data[pdata->num_leds++], | |
248 | &ofdev->dev, NULL); | |
249 | if (ret < 0) { | |
250 | of_node_put(child); | |
251 | goto err; | |
252 | } | |
253 | } | |
254 | ||
255 | dev_set_drvdata(&ofdev->dev, pdata); | |
256 | ||
257 | return 0; | |
258 | ||
259 | err: | |
260 | for (count = pdata->num_leds - 2; count >= 0; count--) | |
261 | delete_gpio_led(&pdata->led_data[count]); | |
262 | ||
263 | kfree(pdata); | |
264 | ||
265 | return ret; | |
266 | } | |
267 | ||
268 | static int __devexit of_gpio_leds_remove(struct of_device *ofdev) | |
269 | { | |
270 | struct gpio_led_of_platform_data *pdata = dev_get_drvdata(&ofdev->dev); | |
271 | int i; | |
272 | ||
273 | for (i = 0; i < pdata->num_leds; i++) | |
274 | delete_gpio_led(&pdata->led_data[i]); | |
275 | ||
276 | kfree(pdata); | |
277 | ||
278 | dev_set_drvdata(&ofdev->dev, NULL); | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
283 | static const struct of_device_id of_gpio_leds_match[] = { | |
284 | { .compatible = "gpio-leds", }, | |
285 | {}, | |
286 | }; | |
287 | ||
288 | static struct of_platform_driver of_gpio_leds_driver = { | |
289 | .driver = { | |
290 | .name = "of_gpio_leds", | |
291 | .owner = THIS_MODULE, | |
292 | }, | |
293 | .match_table = of_gpio_leds_match, | |
294 | .probe = of_gpio_leds_probe, | |
295 | .remove = __devexit_p(of_gpio_leds_remove), | |
296 | }; | |
b2bdc3e7 | 297 | #endif |
a7d878af | 298 | |
b2bdc3e7 | 299 | static int __init gpio_led_init(void) |
a7d878af | 300 | { |
b2bdc3e7 RP |
301 | int ret; |
302 | ||
303 | #ifdef CONFIG_LEDS_GPIO_PLATFORM | |
304 | ret = platform_driver_register(&gpio_led_driver); | |
305 | if (ret) | |
306 | return ret; | |
307 | #endif | |
308 | #ifdef CONFIG_LEDS_GPIO_OF | |
309 | ret = of_register_platform_driver(&of_gpio_leds_driver); | |
310 | #endif | |
311 | #ifdef CONFIG_LEDS_GPIO_PLATFORM | |
312 | if (ret) | |
313 | platform_driver_unregister(&gpio_led_driver); | |
314 | #endif | |
315 | ||
316 | return ret; | |
a7d878af | 317 | } |
a7d878af | 318 | |
b2bdc3e7 | 319 | static void __exit gpio_led_exit(void) |
a7d878af | 320 | { |
b2bdc3e7 RP |
321 | #ifdef CONFIG_LEDS_GPIO_PLATFORM |
322 | platform_driver_unregister(&gpio_led_driver); | |
323 | #endif | |
324 | #ifdef CONFIG_LEDS_GPIO_OF | |
a7d878af | 325 | of_unregister_platform_driver(&of_gpio_leds_driver); |
a7d878af | 326 | #endif |
b2bdc3e7 RP |
327 | } |
328 | ||
329 | module_init(gpio_led_init); | |
330 | module_exit(gpio_led_exit); | |
a7d878af TP |
331 | |
332 | MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>"); | |
22e03f3b RA |
333 | MODULE_DESCRIPTION("GPIO LED driver"); |
334 | MODULE_LICENSE("GPL"); |