Commit | Line | Data |
---|---|---|
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> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
00852279 DB |
18 | #include <linux/workqueue.h> |
19 | ||
22e03f3b RA |
20 | #include <asm/gpio.h> |
21 | ||
22 | struct gpio_led_data { | |
23 | struct led_classdev cdev; | |
24 | unsigned gpio; | |
00852279 DB |
25 | struct work_struct work; |
26 | u8 new_level; | |
27 | u8 can_sleep; | |
22e03f3b | 28 | u8 active_low; |
2146325d BH |
29 | u8 blinking; |
30 | int (*platform_gpio_blink_set)(unsigned gpio, int state, | |
ca3259b3 | 31 | unsigned long *delay_on, unsigned long *delay_off); |
22e03f3b RA |
32 | }; |
33 | ||
00852279 DB |
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 | ||
2146325d BH |
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); | |
00852279 | 46 | } |
22e03f3b RA |
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 | ||
306dd85c DB |
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 | */ | |
00852279 | 67 | if (led_dat->can_sleep) { |
306dd85c DB |
68 | led_dat->new_level = level; |
69 | schedule_work(&led_dat->work); | |
2146325d BH |
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 | } | |
22e03f3b RA |
78 | } |
79 | ||
ca3259b3 HVR |
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 | ||
2146325d BH |
86 | led_dat->blinking = 1; |
87 | return led_dat->platform_gpio_blink_set(led_dat->gpio, GPIO_LED_BLINK, | |
88 | delay_on, delay_off); | |
ca3259b3 HVR |
89 | } |
90 | ||
a7d878af TP |
91 | static int __devinit create_gpio_led(const struct gpio_led *template, |
92 | struct gpio_led_data *led_dat, struct device *parent, | |
2146325d | 93 | int (*blink_set)(unsigned, int, unsigned long *, unsigned long *)) |
a7d878af | 94 | { |
ed88bae6 | 95 | int ret, state; |
a7d878af | 96 | |
0b4634fc DES |
97 | led_dat->gpio = -1; |
98 | ||
d379ee8a DB |
99 | /* skip leds that aren't available */ |
100 | if (!gpio_is_valid(template->gpio)) { | |
2fea0922 | 101 | printk(KERN_INFO "Skipping unavailable LED gpio %d (%s)\n", |
d379ee8a | 102 | template->gpio, template->name); |
ac15e950 | 103 | return 0; |
d379ee8a DB |
104 | } |
105 | ||
a7d878af TP |
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; | |
2146325d | 115 | led_dat->blinking = 0; |
a7d878af TP |
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; | |
ed88bae6 TP |
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; | |
defb512d RP |
126 | if (!template->retain_state_suspended) |
127 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; | |
a7d878af | 128 | |
ed88bae6 | 129 | ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state); |
a7d878af TP |
130 | if (ret < 0) |
131 | goto err; | |
2146325d | 132 | |
a7d878af TP |
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 | { | |
d379ee8a DB |
147 | if (!gpio_is_valid(led->gpio)) |
148 | return; | |
a7d878af TP |
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 | |
7fd02170 | 155 | static int __devinit gpio_led_probe(struct platform_device *pdev) |
22e03f3b RA |
156 | { |
157 | struct gpio_led_platform_data *pdata = pdev->dev.platform_data; | |
a7d878af | 158 | struct gpio_led_data *leds_data; |
22e03f3b RA |
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++) { | |
a7d878af TP |
170 | ret = create_gpio_led(&pdata->leds[i], &leds_data[i], |
171 | &pdev->dev, pdata->gpio_blink_set); | |
d95cbe61 UKK |
172 | if (ret < 0) |
173 | goto err; | |
22e03f3b RA |
174 | } |
175 | ||
176 | platform_set_drvdata(pdev, leds_data); | |
177 | ||
178 | return 0; | |
179 | ||
180 | err: | |
a7d878af TP |
181 | for (i = i - 1; i >= 0; i--) |
182 | delete_gpio_led(&leds_data[i]); | |
00852279 | 183 | |
22e03f3b RA |
184 | kfree(leds_data); |
185 | ||
186 | return ret; | |
187 | } | |
188 | ||
199fb21d | 189 | static int __devexit gpio_led_remove(struct platform_device *pdev) |
22e03f3b RA |
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 | ||
a7d878af TP |
197 | for (i = 0; i < pdata->num_leds; i++) |
198 | delete_gpio_led(&leds_data[i]); | |
199fb21d | 199 | |
22e03f3b RA |
200 | kfree(leds_data); |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
22e03f3b | 205 | static struct platform_driver gpio_led_driver = { |
199fb21d DB |
206 | .probe = gpio_led_probe, |
207 | .remove = __devexit_p(gpio_led_remove), | |
22e03f3b RA |
208 | .driver = { |
209 | .name = "leds-gpio", | |
210 | .owner = THIS_MODULE, | |
211 | }, | |
212 | }; | |
213 | ||
a7d878af TP |
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 of_device *ofdev, | |
228 | const struct of_device_id *match) | |
229 | { | |
61c7a080 | 230 | struct device_node *np = ofdev->dev.of_node, *child; |
a7d878af TP |
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 | ||
a7d878af | 245 | for_each_child_of_node(np, child) { |
0493a4ff | 246 | struct gpio_led led = {}; |
a7d878af | 247 | enum of_gpio_flags flags; |
ed88bae6 | 248 | const char *state; |
a7d878af TP |
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; | |
2146325d | 253 | led.blinking = 0; |
a7d878af TP |
254 | led.default_trigger = |
255 | of_get_property(child, "linux,default-trigger", NULL); | |
ed88bae6 TP |
256 | state = of_get_property(child, "default-state", NULL); |
257 | if (state) { | |
258 | if (!strcmp(state, "keep")) | |
259 | led.default_state = LEDS_GPIO_DEFSTATE_KEEP; | |
260 | else if(!strcmp(state, "on")) | |
261 | led.default_state = LEDS_GPIO_DEFSTATE_ON; | |
262 | else | |
263 | led.default_state = LEDS_GPIO_DEFSTATE_OFF; | |
264 | } | |
a7d878af TP |
265 | |
266 | ret = create_gpio_led(&led, &pdata->led_data[pdata->num_leds++], | |
267 | &ofdev->dev, NULL); | |
268 | if (ret < 0) { | |
269 | of_node_put(child); | |
270 | goto err; | |
271 | } | |
272 | } | |
273 | ||
274 | dev_set_drvdata(&ofdev->dev, pdata); | |
275 | ||
276 | return 0; | |
277 | ||
278 | err: | |
279 | for (count = pdata->num_leds - 2; count >= 0; count--) | |
280 | delete_gpio_led(&pdata->led_data[count]); | |
281 | ||
282 | kfree(pdata); | |
283 | ||
284 | return ret; | |
285 | } | |
286 | ||
287 | static int __devexit of_gpio_leds_remove(struct of_device *ofdev) | |
288 | { | |
289 | struct gpio_led_of_platform_data *pdata = dev_get_drvdata(&ofdev->dev); | |
290 | int i; | |
291 | ||
292 | for (i = 0; i < pdata->num_leds; i++) | |
293 | delete_gpio_led(&pdata->led_data[i]); | |
294 | ||
295 | kfree(pdata); | |
296 | ||
297 | dev_set_drvdata(&ofdev->dev, NULL); | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
302 | static const struct of_device_id of_gpio_leds_match[] = { | |
303 | { .compatible = "gpio-leds", }, | |
304 | {}, | |
305 | }; | |
306 | ||
307 | static struct of_platform_driver of_gpio_leds_driver = { | |
308 | .driver = { | |
309 | .name = "of_gpio_leds", | |
310 | .owner = THIS_MODULE, | |
4018294b | 311 | .of_match_table = of_gpio_leds_match, |
a7d878af | 312 | }, |
a7d878af TP |
313 | .probe = of_gpio_leds_probe, |
314 | .remove = __devexit_p(of_gpio_leds_remove), | |
315 | }; | |
b2bdc3e7 | 316 | #endif |
a7d878af | 317 | |
b2bdc3e7 | 318 | static int __init gpio_led_init(void) |
a7d878af | 319 | { |
b2bdc3e7 RP |
320 | int ret; |
321 | ||
322 | #ifdef CONFIG_LEDS_GPIO_PLATFORM | |
323 | ret = platform_driver_register(&gpio_led_driver); | |
324 | if (ret) | |
325 | return ret; | |
326 | #endif | |
327 | #ifdef CONFIG_LEDS_GPIO_OF | |
328 | ret = of_register_platform_driver(&of_gpio_leds_driver); | |
329 | #endif | |
330 | #ifdef CONFIG_LEDS_GPIO_PLATFORM | |
331 | if (ret) | |
332 | platform_driver_unregister(&gpio_led_driver); | |
333 | #endif | |
334 | ||
335 | return ret; | |
a7d878af | 336 | } |
a7d878af | 337 | |
b2bdc3e7 | 338 | static void __exit gpio_led_exit(void) |
a7d878af | 339 | { |
b2bdc3e7 RP |
340 | #ifdef CONFIG_LEDS_GPIO_PLATFORM |
341 | platform_driver_unregister(&gpio_led_driver); | |
342 | #endif | |
343 | #ifdef CONFIG_LEDS_GPIO_OF | |
a7d878af | 344 | of_unregister_platform_driver(&of_gpio_leds_driver); |
a7d878af | 345 | #endif |
b2bdc3e7 RP |
346 | } |
347 | ||
348 | module_init(gpio_led_init); | |
349 | module_exit(gpio_led_exit); | |
a7d878af TP |
350 | |
351 | MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>"); | |
22e03f3b RA |
352 | MODULE_DESCRIPTION("GPIO LED driver"); |
353 | MODULE_LICENSE("GPL"); |