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> | |
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 | { | |
79 | int ret; | |
80 | ||
81 | ret = gpio_request(template->gpio, template->name); | |
82 | if (ret < 0) | |
83 | return ret; | |
84 | ||
85 | led_dat->cdev.name = template->name; | |
86 | led_dat->cdev.default_trigger = template->default_trigger; | |
87 | led_dat->gpio = template->gpio; | |
88 | led_dat->can_sleep = gpio_cansleep(template->gpio); | |
89 | led_dat->active_low = template->active_low; | |
90 | if (blink_set) { | |
91 | led_dat->platform_gpio_blink_set = blink_set; | |
92 | led_dat->cdev.blink_set = gpio_blink_set; | |
93 | } | |
94 | led_dat->cdev.brightness_set = gpio_led_set; | |
95 | led_dat->cdev.brightness = LED_OFF; | |
defb512d RP |
96 | if (!template->retain_state_suspended) |
97 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; | |
a7d878af TP |
98 | |
99 | ret = gpio_direction_output(led_dat->gpio, led_dat->active_low); | |
100 | if (ret < 0) | |
101 | goto err; | |
102 | ||
103 | INIT_WORK(&led_dat->work, gpio_led_work); | |
104 | ||
105 | ret = led_classdev_register(parent, &led_dat->cdev); | |
106 | if (ret < 0) | |
107 | goto err; | |
108 | ||
109 | return 0; | |
110 | err: | |
111 | gpio_free(led_dat->gpio); | |
112 | return ret; | |
113 | } | |
114 | ||
115 | static void delete_gpio_led(struct gpio_led_data *led) | |
116 | { | |
117 | led_classdev_unregister(&led->cdev); | |
118 | cancel_work_sync(&led->work); | |
119 | gpio_free(led->gpio); | |
120 | } | |
121 | ||
122 | #ifdef CONFIG_LEDS_GPIO_PLATFORM | |
199fb21d | 123 | static int gpio_led_probe(struct platform_device *pdev) |
22e03f3b RA |
124 | { |
125 | struct gpio_led_platform_data *pdata = pdev->dev.platform_data; | |
a7d878af | 126 | struct gpio_led_data *leds_data; |
22e03f3b RA |
127 | int i, ret = 0; |
128 | ||
129 | if (!pdata) | |
130 | return -EBUSY; | |
131 | ||
132 | leds_data = kzalloc(sizeof(struct gpio_led_data) * pdata->num_leds, | |
133 | GFP_KERNEL); | |
134 | if (!leds_data) | |
135 | return -ENOMEM; | |
136 | ||
137 | for (i = 0; i < pdata->num_leds; i++) { | |
a7d878af TP |
138 | ret = create_gpio_led(&pdata->leds[i], &leds_data[i], |
139 | &pdev->dev, pdata->gpio_blink_set); | |
d95cbe61 UKK |
140 | if (ret < 0) |
141 | goto err; | |
22e03f3b RA |
142 | } |
143 | ||
144 | platform_set_drvdata(pdev, leds_data); | |
145 | ||
146 | return 0; | |
147 | ||
148 | err: | |
a7d878af TP |
149 | for (i = i - 1; i >= 0; i--) |
150 | delete_gpio_led(&leds_data[i]); | |
00852279 | 151 | |
22e03f3b RA |
152 | kfree(leds_data); |
153 | ||
154 | return ret; | |
155 | } | |
156 | ||
199fb21d | 157 | static int __devexit gpio_led_remove(struct platform_device *pdev) |
22e03f3b RA |
158 | { |
159 | int i; | |
160 | struct gpio_led_platform_data *pdata = pdev->dev.platform_data; | |
161 | struct gpio_led_data *leds_data; | |
162 | ||
163 | leds_data = platform_get_drvdata(pdev); | |
164 | ||
a7d878af TP |
165 | for (i = 0; i < pdata->num_leds; i++) |
166 | delete_gpio_led(&leds_data[i]); | |
199fb21d | 167 | |
22e03f3b RA |
168 | kfree(leds_data); |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
22e03f3b | 173 | static struct platform_driver gpio_led_driver = { |
199fb21d DB |
174 | .probe = gpio_led_probe, |
175 | .remove = __devexit_p(gpio_led_remove), | |
22e03f3b RA |
176 | .driver = { |
177 | .name = "leds-gpio", | |
178 | .owner = THIS_MODULE, | |
179 | }, | |
180 | }; | |
181 | ||
a7d878af TP |
182 | MODULE_ALIAS("platform:leds-gpio"); |
183 | #endif /* CONFIG_LEDS_GPIO_PLATFORM */ | |
184 | ||
185 | /* Code to create from OpenFirmware platform devices */ | |
186 | #ifdef CONFIG_LEDS_GPIO_OF | |
187 | #include <linux/of_platform.h> | |
188 | #include <linux/of_gpio.h> | |
189 | ||
190 | struct gpio_led_of_platform_data { | |
191 | int num_leds; | |
192 | struct gpio_led_data led_data[]; | |
193 | }; | |
194 | ||
195 | static int __devinit of_gpio_leds_probe(struct of_device *ofdev, | |
196 | const struct of_device_id *match) | |
197 | { | |
198 | struct device_node *np = ofdev->node, *child; | |
199 | struct gpio_led led; | |
200 | struct gpio_led_of_platform_data *pdata; | |
201 | int count = 0, ret; | |
202 | ||
203 | /* count LEDs defined by this device, so we know how much to allocate */ | |
204 | for_each_child_of_node(np, child) | |
205 | count++; | |
206 | if (!count) | |
207 | return 0; /* or ENODEV? */ | |
208 | ||
209 | pdata = kzalloc(sizeof(*pdata) + sizeof(struct gpio_led_data) * count, | |
210 | GFP_KERNEL); | |
211 | if (!pdata) | |
212 | return -ENOMEM; | |
213 | ||
214 | memset(&led, 0, sizeof(led)); | |
215 | for_each_child_of_node(np, child) { | |
216 | enum of_gpio_flags flags; | |
217 | ||
218 | led.gpio = of_get_gpio_flags(child, 0, &flags); | |
219 | led.active_low = flags & OF_GPIO_ACTIVE_LOW; | |
220 | led.name = of_get_property(child, "label", NULL) ? : child->name; | |
221 | led.default_trigger = | |
222 | of_get_property(child, "linux,default-trigger", NULL); | |
223 | ||
224 | ret = create_gpio_led(&led, &pdata->led_data[pdata->num_leds++], | |
225 | &ofdev->dev, NULL); | |
226 | if (ret < 0) { | |
227 | of_node_put(child); | |
228 | goto err; | |
229 | } | |
230 | } | |
231 | ||
232 | dev_set_drvdata(&ofdev->dev, pdata); | |
233 | ||
234 | return 0; | |
235 | ||
236 | err: | |
237 | for (count = pdata->num_leds - 2; count >= 0; count--) | |
238 | delete_gpio_led(&pdata->led_data[count]); | |
239 | ||
240 | kfree(pdata); | |
241 | ||
242 | return ret; | |
243 | } | |
244 | ||
245 | static int __devexit of_gpio_leds_remove(struct of_device *ofdev) | |
246 | { | |
247 | struct gpio_led_of_platform_data *pdata = dev_get_drvdata(&ofdev->dev); | |
248 | int i; | |
249 | ||
250 | for (i = 0; i < pdata->num_leds; i++) | |
251 | delete_gpio_led(&pdata->led_data[i]); | |
252 | ||
253 | kfree(pdata); | |
254 | ||
255 | dev_set_drvdata(&ofdev->dev, NULL); | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
260 | static const struct of_device_id of_gpio_leds_match[] = { | |
261 | { .compatible = "gpio-leds", }, | |
262 | {}, | |
263 | }; | |
264 | ||
265 | static struct of_platform_driver of_gpio_leds_driver = { | |
266 | .driver = { | |
267 | .name = "of_gpio_leds", | |
268 | .owner = THIS_MODULE, | |
269 | }, | |
270 | .match_table = of_gpio_leds_match, | |
271 | .probe = of_gpio_leds_probe, | |
272 | .remove = __devexit_p(of_gpio_leds_remove), | |
273 | }; | |
b2bdc3e7 | 274 | #endif |
a7d878af | 275 | |
b2bdc3e7 | 276 | static int __init gpio_led_init(void) |
a7d878af | 277 | { |
b2bdc3e7 RP |
278 | int ret; |
279 | ||
280 | #ifdef CONFIG_LEDS_GPIO_PLATFORM | |
281 | ret = platform_driver_register(&gpio_led_driver); | |
282 | if (ret) | |
283 | return ret; | |
284 | #endif | |
285 | #ifdef CONFIG_LEDS_GPIO_OF | |
286 | ret = of_register_platform_driver(&of_gpio_leds_driver); | |
287 | #endif | |
288 | #ifdef CONFIG_LEDS_GPIO_PLATFORM | |
289 | if (ret) | |
290 | platform_driver_unregister(&gpio_led_driver); | |
291 | #endif | |
292 | ||
293 | return ret; | |
a7d878af | 294 | } |
a7d878af | 295 | |
b2bdc3e7 | 296 | static void __exit gpio_led_exit(void) |
a7d878af | 297 | { |
b2bdc3e7 RP |
298 | #ifdef CONFIG_LEDS_GPIO_PLATFORM |
299 | platform_driver_unregister(&gpio_led_driver); | |
300 | #endif | |
301 | #ifdef CONFIG_LEDS_GPIO_OF | |
a7d878af | 302 | of_unregister_platform_driver(&of_gpio_leds_driver); |
a7d878af | 303 | #endif |
b2bdc3e7 RP |
304 | } |
305 | ||
306 | module_init(gpio_led_init); | |
307 | module_exit(gpio_led_exit); | |
a7d878af TP |
308 | |
309 | MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>"); | |
22e03f3b RA |
310 | MODULE_DESCRIPTION("GPIO LED driver"); |
311 | MODULE_LICENSE("GPL"); |