]>
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; |
ca3259b3 HVR |
29 | int (*platform_gpio_blink_set)(unsigned gpio, |
30 | unsigned long *delay_on, unsigned long *delay_off); | |
22e03f3b RA |
31 | }; |
32 | ||
00852279 DB |
33 | static void gpio_led_work(struct work_struct *work) |
34 | { | |
35 | struct gpio_led_data *led_dat = | |
36 | container_of(work, struct gpio_led_data, work); | |
37 | ||
38 | gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level); | |
39 | } | |
22e03f3b RA |
40 | |
41 | static void gpio_led_set(struct led_classdev *led_cdev, | |
42 | enum led_brightness value) | |
43 | { | |
44 | struct gpio_led_data *led_dat = | |
45 | container_of(led_cdev, struct gpio_led_data, cdev); | |
46 | int level; | |
47 | ||
48 | if (value == LED_OFF) | |
49 | level = 0; | |
50 | else | |
51 | level = 1; | |
52 | ||
53 | if (led_dat->active_low) | |
54 | level = !level; | |
55 | ||
306dd85c DB |
56 | /* Setting GPIOs with I2C/etc requires a task context, and we don't |
57 | * seem to have a reliable way to know if we're already in one; so | |
58 | * let's just assume the worst. | |
59 | */ | |
00852279 | 60 | if (led_dat->can_sleep) { |
306dd85c DB |
61 | led_dat->new_level = level; |
62 | schedule_work(&led_dat->work); | |
00852279 DB |
63 | } else |
64 | gpio_set_value(led_dat->gpio, level); | |
22e03f3b RA |
65 | } |
66 | ||
ca3259b3 HVR |
67 | static int gpio_blink_set(struct led_classdev *led_cdev, |
68 | unsigned long *delay_on, unsigned long *delay_off) | |
69 | { | |
70 | struct gpio_led_data *led_dat = | |
71 | container_of(led_cdev, struct gpio_led_data, cdev); | |
72 | ||
73 | return led_dat->platform_gpio_blink_set(led_dat->gpio, delay_on, delay_off); | |
74 | } | |
75 | ||
a7d878af TP |
76 | static int __devinit create_gpio_led(const struct gpio_led *template, |
77 | struct gpio_led_data *led_dat, struct device *parent, | |
78 | int (*blink_set)(unsigned, unsigned long *, unsigned long *)) | |
79 | { | |
ed88bae6 | 80 | int ret, state; |
a7d878af | 81 | |
0b4634fc DES |
82 | led_dat->gpio = -1; |
83 | ||
d379ee8a DB |
84 | /* skip leds that aren't available */ |
85 | if (!gpio_is_valid(template->gpio)) { | |
2fea0922 | 86 | printk(KERN_INFO "Skipping unavailable LED gpio %d (%s)\n", |
d379ee8a | 87 | template->gpio, template->name); |
ac15e950 | 88 | return 0; |
d379ee8a DB |
89 | } |
90 | ||
a7d878af TP |
91 | ret = gpio_request(template->gpio, template->name); |
92 | if (ret < 0) | |
93 | return ret; | |
94 | ||
95 | led_dat->cdev.name = template->name; | |
96 | led_dat->cdev.default_trigger = template->default_trigger; | |
97 | led_dat->gpio = template->gpio; | |
98 | led_dat->can_sleep = gpio_cansleep(template->gpio); | |
99 | led_dat->active_low = template->active_low; | |
100 | if (blink_set) { | |
101 | led_dat->platform_gpio_blink_set = blink_set; | |
102 | led_dat->cdev.blink_set = gpio_blink_set; | |
103 | } | |
104 | led_dat->cdev.brightness_set = gpio_led_set; | |
ed88bae6 TP |
105 | if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) |
106 | state = !!gpio_get_value(led_dat->gpio) ^ led_dat->active_low; | |
107 | else | |
108 | state = (template->default_state == LEDS_GPIO_DEFSTATE_ON); | |
109 | led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; | |
defb512d RP |
110 | if (!template->retain_state_suspended) |
111 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; | |
a7d878af | 112 | |
ed88bae6 | 113 | ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state); |
a7d878af TP |
114 | if (ret < 0) |
115 | goto err; | |
116 | ||
117 | INIT_WORK(&led_dat->work, gpio_led_work); | |
118 | ||
119 | ret = led_classdev_register(parent, &led_dat->cdev); | |
120 | if (ret < 0) | |
121 | goto err; | |
122 | ||
123 | return 0; | |
124 | err: | |
125 | gpio_free(led_dat->gpio); | |
126 | return ret; | |
127 | } | |
128 | ||
129 | static void delete_gpio_led(struct gpio_led_data *led) | |
130 | { | |
d379ee8a DB |
131 | if (!gpio_is_valid(led->gpio)) |
132 | return; | |
a7d878af TP |
133 | led_classdev_unregister(&led->cdev); |
134 | cancel_work_sync(&led->work); | |
135 | gpio_free(led->gpio); | |
136 | } | |
137 | ||
138 | #ifdef CONFIG_LEDS_GPIO_PLATFORM | |
7fd02170 | 139 | static int __devinit gpio_led_probe(struct platform_device *pdev) |
22e03f3b RA |
140 | { |
141 | struct gpio_led_platform_data *pdata = pdev->dev.platform_data; | |
a7d878af | 142 | struct gpio_led_data *leds_data; |
22e03f3b RA |
143 | int i, ret = 0; |
144 | ||
145 | if (!pdata) | |
146 | return -EBUSY; | |
147 | ||
148 | leds_data = kzalloc(sizeof(struct gpio_led_data) * pdata->num_leds, | |
149 | GFP_KERNEL); | |
150 | if (!leds_data) | |
151 | return -ENOMEM; | |
152 | ||
153 | for (i = 0; i < pdata->num_leds; i++) { | |
a7d878af TP |
154 | ret = create_gpio_led(&pdata->leds[i], &leds_data[i], |
155 | &pdev->dev, pdata->gpio_blink_set); | |
d95cbe61 UKK |
156 | if (ret < 0) |
157 | goto err; | |
22e03f3b RA |
158 | } |
159 | ||
160 | platform_set_drvdata(pdev, leds_data); | |
161 | ||
162 | return 0; | |
163 | ||
164 | err: | |
a7d878af TP |
165 | for (i = i - 1; i >= 0; i--) |
166 | delete_gpio_led(&leds_data[i]); | |
00852279 | 167 | |
22e03f3b RA |
168 | kfree(leds_data); |
169 | ||
170 | return ret; | |
171 | } | |
172 | ||
199fb21d | 173 | static int __devexit gpio_led_remove(struct platform_device *pdev) |
22e03f3b RA |
174 | { |
175 | int i; | |
176 | struct gpio_led_platform_data *pdata = pdev->dev.platform_data; | |
177 | struct gpio_led_data *leds_data; | |
178 | ||
179 | leds_data = platform_get_drvdata(pdev); | |
180 | ||
a7d878af TP |
181 | for (i = 0; i < pdata->num_leds; i++) |
182 | delete_gpio_led(&leds_data[i]); | |
199fb21d | 183 | |
22e03f3b RA |
184 | kfree(leds_data); |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
22e03f3b | 189 | static struct platform_driver gpio_led_driver = { |
199fb21d DB |
190 | .probe = gpio_led_probe, |
191 | .remove = __devexit_p(gpio_led_remove), | |
22e03f3b RA |
192 | .driver = { |
193 | .name = "leds-gpio", | |
194 | .owner = THIS_MODULE, | |
195 | }, | |
196 | }; | |
197 | ||
a7d878af TP |
198 | MODULE_ALIAS("platform:leds-gpio"); |
199 | #endif /* CONFIG_LEDS_GPIO_PLATFORM */ | |
200 | ||
201 | /* Code to create from OpenFirmware platform devices */ | |
202 | #ifdef CONFIG_LEDS_GPIO_OF | |
203 | #include <linux/of_platform.h> | |
204 | #include <linux/of_gpio.h> | |
205 | ||
206 | struct gpio_led_of_platform_data { | |
207 | int num_leds; | |
208 | struct gpio_led_data led_data[]; | |
209 | }; | |
210 | ||
211 | static int __devinit of_gpio_leds_probe(struct of_device *ofdev, | |
212 | const struct of_device_id *match) | |
213 | { | |
61c7a080 | 214 | struct device_node *np = ofdev->dev.of_node, *child; |
a7d878af TP |
215 | struct gpio_led_of_platform_data *pdata; |
216 | int count = 0, ret; | |
217 | ||
218 | /* count LEDs defined by this device, so we know how much to allocate */ | |
219 | for_each_child_of_node(np, child) | |
220 | count++; | |
221 | if (!count) | |
222 | return 0; /* or ENODEV? */ | |
223 | ||
224 | pdata = kzalloc(sizeof(*pdata) + sizeof(struct gpio_led_data) * count, | |
225 | GFP_KERNEL); | |
226 | if (!pdata) | |
227 | return -ENOMEM; | |
228 | ||
a7d878af | 229 | for_each_child_of_node(np, child) { |
0493a4ff | 230 | struct gpio_led led = {}; |
a7d878af | 231 | enum of_gpio_flags flags; |
ed88bae6 | 232 | const char *state; |
a7d878af TP |
233 | |
234 | led.gpio = of_get_gpio_flags(child, 0, &flags); | |
235 | led.active_low = flags & OF_GPIO_ACTIVE_LOW; | |
236 | led.name = of_get_property(child, "label", NULL) ? : child->name; | |
237 | led.default_trigger = | |
238 | of_get_property(child, "linux,default-trigger", NULL); | |
ed88bae6 TP |
239 | state = of_get_property(child, "default-state", NULL); |
240 | if (state) { | |
241 | if (!strcmp(state, "keep")) | |
242 | led.default_state = LEDS_GPIO_DEFSTATE_KEEP; | |
243 | else if(!strcmp(state, "on")) | |
244 | led.default_state = LEDS_GPIO_DEFSTATE_ON; | |
245 | else | |
246 | led.default_state = LEDS_GPIO_DEFSTATE_OFF; | |
247 | } | |
a7d878af TP |
248 | |
249 | ret = create_gpio_led(&led, &pdata->led_data[pdata->num_leds++], | |
250 | &ofdev->dev, NULL); | |
251 | if (ret < 0) { | |
252 | of_node_put(child); | |
253 | goto err; | |
254 | } | |
255 | } | |
256 | ||
257 | dev_set_drvdata(&ofdev->dev, pdata); | |
258 | ||
259 | return 0; | |
260 | ||
261 | err: | |
262 | for (count = pdata->num_leds - 2; count >= 0; count--) | |
263 | delete_gpio_led(&pdata->led_data[count]); | |
264 | ||
265 | kfree(pdata); | |
266 | ||
267 | return ret; | |
268 | } | |
269 | ||
270 | static int __devexit of_gpio_leds_remove(struct of_device *ofdev) | |
271 | { | |
272 | struct gpio_led_of_platform_data *pdata = dev_get_drvdata(&ofdev->dev); | |
273 | int i; | |
274 | ||
275 | for (i = 0; i < pdata->num_leds; i++) | |
276 | delete_gpio_led(&pdata->led_data[i]); | |
277 | ||
278 | kfree(pdata); | |
279 | ||
280 | dev_set_drvdata(&ofdev->dev, NULL); | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | static const struct of_device_id of_gpio_leds_match[] = { | |
286 | { .compatible = "gpio-leds", }, | |
287 | {}, | |
288 | }; | |
289 | ||
290 | static struct of_platform_driver of_gpio_leds_driver = { | |
291 | .driver = { | |
292 | .name = "of_gpio_leds", | |
293 | .owner = THIS_MODULE, | |
4018294b | 294 | .of_match_table = of_gpio_leds_match, |
a7d878af | 295 | }, |
a7d878af TP |
296 | .probe = of_gpio_leds_probe, |
297 | .remove = __devexit_p(of_gpio_leds_remove), | |
298 | }; | |
b2bdc3e7 | 299 | #endif |
a7d878af | 300 | |
b2bdc3e7 | 301 | static int __init gpio_led_init(void) |
a7d878af | 302 | { |
b2bdc3e7 RP |
303 | int ret; |
304 | ||
305 | #ifdef CONFIG_LEDS_GPIO_PLATFORM | |
306 | ret = platform_driver_register(&gpio_led_driver); | |
307 | if (ret) | |
308 | return ret; | |
309 | #endif | |
310 | #ifdef CONFIG_LEDS_GPIO_OF | |
311 | ret = of_register_platform_driver(&of_gpio_leds_driver); | |
312 | #endif | |
313 | #ifdef CONFIG_LEDS_GPIO_PLATFORM | |
314 | if (ret) | |
315 | platform_driver_unregister(&gpio_led_driver); | |
316 | #endif | |
317 | ||
318 | return ret; | |
a7d878af | 319 | } |
a7d878af | 320 | |
b2bdc3e7 | 321 | static void __exit gpio_led_exit(void) |
a7d878af | 322 | { |
b2bdc3e7 RP |
323 | #ifdef CONFIG_LEDS_GPIO_PLATFORM |
324 | platform_driver_unregister(&gpio_led_driver); | |
325 | #endif | |
326 | #ifdef CONFIG_LEDS_GPIO_OF | |
a7d878af | 327 | of_unregister_platform_driver(&of_gpio_leds_driver); |
a7d878af | 328 | #endif |
b2bdc3e7 RP |
329 | } |
330 | ||
331 | module_init(gpio_led_init); | |
332 | module_exit(gpio_led_exit); | |
a7d878af TP |
333 | |
334 | MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>"); | |
22e03f3b RA |
335 | MODULE_DESCRIPTION("GPIO LED driver"); |
336 | MODULE_LICENSE("GPL"); |