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> | |
a314c5c0 GL |
17 | #include <linux/of_platform.h> |
18 | #include <linux/of_gpio.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
00852279 | 20 | #include <linux/workqueue.h> |
54f4dedb | 21 | #include <linux/module.h> |
00852279 | 22 | |
22e03f3b RA |
23 | #include <asm/gpio.h> |
24 | ||
25 | struct gpio_led_data { | |
26 | struct led_classdev cdev; | |
27 | unsigned gpio; | |
00852279 DB |
28 | struct work_struct work; |
29 | u8 new_level; | |
30 | u8 can_sleep; | |
22e03f3b | 31 | u8 active_low; |
2146325d BH |
32 | u8 blinking; |
33 | int (*platform_gpio_blink_set)(unsigned gpio, int state, | |
ca3259b3 | 34 | unsigned long *delay_on, unsigned long *delay_off); |
22e03f3b RA |
35 | }; |
36 | ||
00852279 DB |
37 | static void gpio_led_work(struct work_struct *work) |
38 | { | |
39 | struct gpio_led_data *led_dat = | |
40 | container_of(work, struct gpio_led_data, work); | |
41 | ||
2146325d BH |
42 | if (led_dat->blinking) { |
43 | led_dat->platform_gpio_blink_set(led_dat->gpio, | |
44 | led_dat->new_level, | |
45 | NULL, NULL); | |
46 | led_dat->blinking = 0; | |
47 | } else | |
48 | gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level); | |
00852279 | 49 | } |
22e03f3b RA |
50 | |
51 | static void gpio_led_set(struct led_classdev *led_cdev, | |
52 | enum led_brightness value) | |
53 | { | |
54 | struct gpio_led_data *led_dat = | |
55 | container_of(led_cdev, struct gpio_led_data, cdev); | |
56 | int level; | |
57 | ||
58 | if (value == LED_OFF) | |
59 | level = 0; | |
60 | else | |
61 | level = 1; | |
62 | ||
63 | if (led_dat->active_low) | |
64 | level = !level; | |
65 | ||
306dd85c DB |
66 | /* Setting GPIOs with I2C/etc requires a task context, and we don't |
67 | * seem to have a reliable way to know if we're already in one; so | |
68 | * let's just assume the worst. | |
69 | */ | |
00852279 | 70 | if (led_dat->can_sleep) { |
306dd85c DB |
71 | led_dat->new_level = level; |
72 | schedule_work(&led_dat->work); | |
2146325d BH |
73 | } else { |
74 | if (led_dat->blinking) { | |
75 | led_dat->platform_gpio_blink_set(led_dat->gpio, level, | |
76 | NULL, NULL); | |
77 | led_dat->blinking = 0; | |
78 | } else | |
79 | gpio_set_value(led_dat->gpio, level); | |
80 | } | |
22e03f3b RA |
81 | } |
82 | ||
ca3259b3 HVR |
83 | static int gpio_blink_set(struct led_classdev *led_cdev, |
84 | unsigned long *delay_on, unsigned long *delay_off) | |
85 | { | |
86 | struct gpio_led_data *led_dat = | |
87 | container_of(led_cdev, struct gpio_led_data, cdev); | |
88 | ||
2146325d BH |
89 | led_dat->blinking = 1; |
90 | return led_dat->platform_gpio_blink_set(led_dat->gpio, GPIO_LED_BLINK, | |
91 | delay_on, delay_off); | |
ca3259b3 HVR |
92 | } |
93 | ||
a7d878af TP |
94 | static int __devinit create_gpio_led(const struct gpio_led *template, |
95 | struct gpio_led_data *led_dat, struct device *parent, | |
2146325d | 96 | int (*blink_set)(unsigned, int, unsigned long *, unsigned long *)) |
a7d878af | 97 | { |
ed88bae6 | 98 | int ret, state; |
a7d878af | 99 | |
0b4634fc DES |
100 | led_dat->gpio = -1; |
101 | ||
d379ee8a DB |
102 | /* skip leds that aren't available */ |
103 | if (!gpio_is_valid(template->gpio)) { | |
2fea0922 | 104 | printk(KERN_INFO "Skipping unavailable LED gpio %d (%s)\n", |
d379ee8a | 105 | template->gpio, template->name); |
ac15e950 | 106 | return 0; |
d379ee8a DB |
107 | } |
108 | ||
a7d878af TP |
109 | ret = gpio_request(template->gpio, template->name); |
110 | if (ret < 0) | |
111 | return ret; | |
112 | ||
113 | led_dat->cdev.name = template->name; | |
114 | led_dat->cdev.default_trigger = template->default_trigger; | |
115 | led_dat->gpio = template->gpio; | |
116 | led_dat->can_sleep = gpio_cansleep(template->gpio); | |
117 | led_dat->active_low = template->active_low; | |
2146325d | 118 | led_dat->blinking = 0; |
a7d878af TP |
119 | if (blink_set) { |
120 | led_dat->platform_gpio_blink_set = blink_set; | |
121 | led_dat->cdev.blink_set = gpio_blink_set; | |
122 | } | |
123 | led_dat->cdev.brightness_set = gpio_led_set; | |
ed88bae6 | 124 | if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) |
dabc69c2 | 125 | state = !!gpio_get_value_cansleep(led_dat->gpio) ^ led_dat->active_low; |
ed88bae6 TP |
126 | else |
127 | state = (template->default_state == LEDS_GPIO_DEFSTATE_ON); | |
128 | led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; | |
defb512d RP |
129 | if (!template->retain_state_suspended) |
130 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; | |
a7d878af | 131 | |
ed88bae6 | 132 | ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state); |
a7d878af TP |
133 | if (ret < 0) |
134 | goto err; | |
2146325d | 135 | |
a7d878af TP |
136 | INIT_WORK(&led_dat->work, gpio_led_work); |
137 | ||
138 | ret = led_classdev_register(parent, &led_dat->cdev); | |
139 | if (ret < 0) | |
140 | goto err; | |
141 | ||
142 | return 0; | |
143 | err: | |
144 | gpio_free(led_dat->gpio); | |
145 | return ret; | |
146 | } | |
147 | ||
148 | static void delete_gpio_led(struct gpio_led_data *led) | |
149 | { | |
d379ee8a DB |
150 | if (!gpio_is_valid(led->gpio)) |
151 | return; | |
a7d878af TP |
152 | led_classdev_unregister(&led->cdev); |
153 | cancel_work_sync(&led->work); | |
154 | gpio_free(led->gpio); | |
155 | } | |
156 | ||
a314c5c0 GL |
157 | struct gpio_leds_priv { |
158 | int num_leds; | |
159 | struct gpio_led_data leds[]; | |
160 | }; | |
22e03f3b | 161 | |
a314c5c0 | 162 | static inline int sizeof_gpio_leds_priv(int num_leds) |
22e03f3b | 163 | { |
a314c5c0 GL |
164 | return sizeof(struct gpio_leds_priv) + |
165 | (sizeof(struct gpio_led_data) * num_leds); | |
22e03f3b RA |
166 | } |
167 | ||
a7d878af | 168 | /* Code to create from OpenFirmware platform devices */ |
2bcc7ed5 | 169 | #ifdef CONFIG_OF_GPIO |
a314c5c0 | 170 | static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev) |
a7d878af | 171 | { |
a314c5c0 GL |
172 | struct device_node *np = pdev->dev.of_node, *child; |
173 | struct gpio_leds_priv *priv; | |
a7d878af TP |
174 | int count = 0, ret; |
175 | ||
a314c5c0 | 176 | /* count LEDs in this device, so we know how much to allocate */ |
a7d878af TP |
177 | for_each_child_of_node(np, child) |
178 | count++; | |
179 | if (!count) | |
a314c5c0 | 180 | return NULL; |
a7d878af | 181 | |
a314c5c0 GL |
182 | priv = kzalloc(sizeof_gpio_leds_priv(count), GFP_KERNEL); |
183 | if (!priv) | |
184 | return NULL; | |
a7d878af | 185 | |
a7d878af | 186 | for_each_child_of_node(np, child) { |
0493a4ff | 187 | struct gpio_led led = {}; |
a7d878af | 188 | enum of_gpio_flags flags; |
ed88bae6 | 189 | const char *state; |
a7d878af TP |
190 | |
191 | led.gpio = of_get_gpio_flags(child, 0, &flags); | |
192 | led.active_low = flags & OF_GPIO_ACTIVE_LOW; | |
193 | led.name = of_get_property(child, "label", NULL) ? : child->name; | |
194 | led.default_trigger = | |
195 | of_get_property(child, "linux,default-trigger", NULL); | |
ed88bae6 TP |
196 | state = of_get_property(child, "default-state", NULL); |
197 | if (state) { | |
198 | if (!strcmp(state, "keep")) | |
199 | led.default_state = LEDS_GPIO_DEFSTATE_KEEP; | |
a314c5c0 | 200 | else if (!strcmp(state, "on")) |
ed88bae6 TP |
201 | led.default_state = LEDS_GPIO_DEFSTATE_ON; |
202 | else | |
203 | led.default_state = LEDS_GPIO_DEFSTATE_OFF; | |
204 | } | |
a7d878af | 205 | |
a314c5c0 GL |
206 | ret = create_gpio_led(&led, &priv->leds[priv->num_leds++], |
207 | &pdev->dev, NULL); | |
a7d878af TP |
208 | if (ret < 0) { |
209 | of_node_put(child); | |
210 | goto err; | |
211 | } | |
212 | } | |
213 | ||
a314c5c0 | 214 | return priv; |
a7d878af TP |
215 | |
216 | err: | |
a314c5c0 GL |
217 | for (count = priv->num_leds - 2; count >= 0; count--) |
218 | delete_gpio_led(&priv->leds[count]); | |
219 | kfree(priv); | |
220 | return NULL; | |
221 | } | |
a7d878af | 222 | |
a314c5c0 GL |
223 | static const struct of_device_id of_gpio_leds_match[] = { |
224 | { .compatible = "gpio-leds", }, | |
225 | {}, | |
226 | }; | |
2bcc7ed5 | 227 | #else /* CONFIG_OF_GPIO */ |
a314c5c0 GL |
228 | static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev) |
229 | { | |
230 | return NULL; | |
231 | } | |
232 | #define of_gpio_leds_match NULL | |
2bcc7ed5 | 233 | #endif /* CONFIG_OF_GPIO */ |
a7d878af | 234 | |
a314c5c0 GL |
235 | |
236 | static int __devinit gpio_led_probe(struct platform_device *pdev) | |
237 | { | |
238 | struct gpio_led_platform_data *pdata = pdev->dev.platform_data; | |
239 | struct gpio_leds_priv *priv; | |
240 | int i, ret = 0; | |
241 | ||
242 | if (pdata && pdata->num_leds) { | |
243 | priv = kzalloc(sizeof_gpio_leds_priv(pdata->num_leds), | |
244 | GFP_KERNEL); | |
245 | if (!priv) | |
246 | return -ENOMEM; | |
247 | ||
248 | priv->num_leds = pdata->num_leds; | |
249 | for (i = 0; i < priv->num_leds; i++) { | |
250 | ret = create_gpio_led(&pdata->leds[i], | |
251 | &priv->leds[i], | |
252 | &pdev->dev, pdata->gpio_blink_set); | |
253 | if (ret < 0) { | |
254 | /* On failure: unwind the led creations */ | |
255 | for (i = i - 1; i >= 0; i--) | |
256 | delete_gpio_led(&priv->leds[i]); | |
257 | kfree(priv); | |
258 | return ret; | |
259 | } | |
260 | } | |
261 | } else { | |
262 | priv = gpio_leds_create_of(pdev); | |
263 | if (!priv) | |
264 | return -ENODEV; | |
265 | } | |
266 | ||
267 | platform_set_drvdata(pdev, priv); | |
268 | ||
269 | return 0; | |
a7d878af TP |
270 | } |
271 | ||
a314c5c0 | 272 | static int __devexit gpio_led_remove(struct platform_device *pdev) |
a7d878af | 273 | { |
a314c5c0 | 274 | struct gpio_leds_priv *priv = dev_get_drvdata(&pdev->dev); |
a7d878af TP |
275 | int i; |
276 | ||
a314c5c0 GL |
277 | for (i = 0; i < priv->num_leds; i++) |
278 | delete_gpio_led(&priv->leds[i]); | |
a7d878af | 279 | |
a314c5c0 GL |
280 | dev_set_drvdata(&pdev->dev, NULL); |
281 | kfree(priv); | |
a7d878af TP |
282 | |
283 | return 0; | |
284 | } | |
285 | ||
a314c5c0 GL |
286 | static struct platform_driver gpio_led_driver = { |
287 | .probe = gpio_led_probe, | |
288 | .remove = __devexit_p(gpio_led_remove), | |
289 | .driver = { | |
290 | .name = "leds-gpio", | |
291 | .owner = THIS_MODULE, | |
4018294b | 292 | .of_match_table = of_gpio_leds_match, |
a7d878af | 293 | }, |
a7d878af | 294 | }; |
a314c5c0 | 295 | |
892a8843 | 296 | module_platform_driver(gpio_led_driver); |
a7d878af TP |
297 | |
298 | MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>"); | |
22e03f3b RA |
299 | MODULE_DESCRIPTION("GPIO LED driver"); |
300 | MODULE_LICENSE("GPL"); | |
892a8843 | 301 | MODULE_ALIAS("platform:leds-gpio"); |