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> | |
16db7f90 | 16 | #include <linux/gpio.h> |
22e03f3b | 17 | #include <linux/leds.h> |
a314c5c0 GL |
18 | #include <linux/of_platform.h> |
19 | #include <linux/of_gpio.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
00852279 | 21 | #include <linux/workqueue.h> |
54f4dedb | 22 | #include <linux/module.h> |
00852279 | 23 | |
22e03f3b RA |
24 | struct gpio_led_data { |
25 | struct led_classdev cdev; | |
26 | unsigned gpio; | |
00852279 DB |
27 | struct work_struct work; |
28 | u8 new_level; | |
29 | u8 can_sleep; | |
22e03f3b | 30 | u8 active_low; |
2146325d BH |
31 | u8 blinking; |
32 | int (*platform_gpio_blink_set)(unsigned gpio, int state, | |
ca3259b3 | 33 | unsigned long *delay_on, unsigned long *delay_off); |
22e03f3b RA |
34 | }; |
35 | ||
00852279 DB |
36 | static void gpio_led_work(struct work_struct *work) |
37 | { | |
38 | struct gpio_led_data *led_dat = | |
39 | container_of(work, struct gpio_led_data, work); | |
40 | ||
2146325d BH |
41 | if (led_dat->blinking) { |
42 | led_dat->platform_gpio_blink_set(led_dat->gpio, | |
43 | led_dat->new_level, | |
44 | NULL, NULL); | |
45 | led_dat->blinking = 0; | |
46 | } else | |
47 | gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level); | |
00852279 | 48 | } |
22e03f3b RA |
49 | |
50 | static void gpio_led_set(struct led_classdev *led_cdev, | |
51 | enum led_brightness value) | |
52 | { | |
53 | struct gpio_led_data *led_dat = | |
54 | container_of(led_cdev, struct gpio_led_data, cdev); | |
55 | int level; | |
56 | ||
57 | if (value == LED_OFF) | |
58 | level = 0; | |
59 | else | |
60 | level = 1; | |
61 | ||
62 | if (led_dat->active_low) | |
63 | level = !level; | |
64 | ||
306dd85c DB |
65 | /* Setting GPIOs with I2C/etc requires a task context, and we don't |
66 | * seem to have a reliable way to know if we're already in one; so | |
67 | * let's just assume the worst. | |
68 | */ | |
00852279 | 69 | if (led_dat->can_sleep) { |
306dd85c DB |
70 | led_dat->new_level = level; |
71 | schedule_work(&led_dat->work); | |
2146325d BH |
72 | } else { |
73 | if (led_dat->blinking) { | |
74 | led_dat->platform_gpio_blink_set(led_dat->gpio, level, | |
75 | NULL, NULL); | |
76 | led_dat->blinking = 0; | |
77 | } else | |
78 | gpio_set_value(led_dat->gpio, level); | |
79 | } | |
22e03f3b RA |
80 | } |
81 | ||
ca3259b3 HVR |
82 | static int gpio_blink_set(struct led_classdev *led_cdev, |
83 | unsigned long *delay_on, unsigned long *delay_off) | |
84 | { | |
85 | struct gpio_led_data *led_dat = | |
86 | container_of(led_cdev, struct gpio_led_data, cdev); | |
87 | ||
2146325d BH |
88 | led_dat->blinking = 1; |
89 | return led_dat->platform_gpio_blink_set(led_dat->gpio, GPIO_LED_BLINK, | |
90 | delay_on, delay_off); | |
ca3259b3 HVR |
91 | } |
92 | ||
a7d878af TP |
93 | static int __devinit create_gpio_led(const struct gpio_led *template, |
94 | struct gpio_led_data *led_dat, struct device *parent, | |
2146325d | 95 | int (*blink_set)(unsigned, int, unsigned long *, unsigned long *)) |
a7d878af | 96 | { |
ed88bae6 | 97 | int ret, state; |
a7d878af | 98 | |
0b4634fc DES |
99 | led_dat->gpio = -1; |
100 | ||
d379ee8a DB |
101 | /* skip leds that aren't available */ |
102 | if (!gpio_is_valid(template->gpio)) { | |
2fea0922 | 103 | printk(KERN_INFO "Skipping unavailable LED gpio %d (%s)\n", |
d379ee8a | 104 | template->gpio, template->name); |
ac15e950 | 105 | return 0; |
d379ee8a DB |
106 | } |
107 | ||
a7d878af TP |
108 | ret = gpio_request(template->gpio, template->name); |
109 | if (ret < 0) | |
110 | return ret; | |
111 | ||
112 | led_dat->cdev.name = template->name; | |
113 | led_dat->cdev.default_trigger = template->default_trigger; | |
114 | led_dat->gpio = template->gpio; | |
115 | led_dat->can_sleep = gpio_cansleep(template->gpio); | |
116 | led_dat->active_low = template->active_low; | |
2146325d | 117 | led_dat->blinking = 0; |
a7d878af TP |
118 | if (blink_set) { |
119 | led_dat->platform_gpio_blink_set = blink_set; | |
120 | led_dat->cdev.blink_set = gpio_blink_set; | |
121 | } | |
122 | led_dat->cdev.brightness_set = gpio_led_set; | |
ed88bae6 | 123 | if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) |
dabc69c2 | 124 | state = !!gpio_get_value_cansleep(led_dat->gpio) ^ led_dat->active_low; |
ed88bae6 TP |
125 | else |
126 | state = (template->default_state == LEDS_GPIO_DEFSTATE_ON); | |
127 | led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; | |
defb512d RP |
128 | if (!template->retain_state_suspended) |
129 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; | |
a7d878af | 130 | |
ed88bae6 | 131 | ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state); |
a7d878af TP |
132 | if (ret < 0) |
133 | goto err; | |
2146325d | 134 | |
a7d878af TP |
135 | INIT_WORK(&led_dat->work, gpio_led_work); |
136 | ||
137 | ret = led_classdev_register(parent, &led_dat->cdev); | |
138 | if (ret < 0) | |
139 | goto err; | |
140 | ||
141 | return 0; | |
142 | err: | |
143 | gpio_free(led_dat->gpio); | |
144 | return ret; | |
145 | } | |
146 | ||
147 | static void delete_gpio_led(struct gpio_led_data *led) | |
148 | { | |
d379ee8a DB |
149 | if (!gpio_is_valid(led->gpio)) |
150 | return; | |
a7d878af TP |
151 | led_classdev_unregister(&led->cdev); |
152 | cancel_work_sync(&led->work); | |
153 | gpio_free(led->gpio); | |
154 | } | |
155 | ||
a314c5c0 GL |
156 | struct gpio_leds_priv { |
157 | int num_leds; | |
158 | struct gpio_led_data leds[]; | |
159 | }; | |
22e03f3b | 160 | |
a314c5c0 | 161 | static inline int sizeof_gpio_leds_priv(int num_leds) |
22e03f3b | 162 | { |
a314c5c0 GL |
163 | return sizeof(struct gpio_leds_priv) + |
164 | (sizeof(struct gpio_led_data) * num_leds); | |
22e03f3b RA |
165 | } |
166 | ||
a7d878af | 167 | /* Code to create from OpenFirmware platform devices */ |
2bcc7ed5 | 168 | #ifdef CONFIG_OF_GPIO |
a314c5c0 | 169 | static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev) |
a7d878af | 170 | { |
a314c5c0 GL |
171 | struct device_node *np = pdev->dev.of_node, *child; |
172 | struct gpio_leds_priv *priv; | |
a7d878af TP |
173 | int count = 0, ret; |
174 | ||
a314c5c0 | 175 | /* count LEDs in this device, so we know how much to allocate */ |
a7d878af TP |
176 | for_each_child_of_node(np, child) |
177 | count++; | |
178 | if (!count) | |
a314c5c0 | 179 | return NULL; |
a7d878af | 180 | |
198b8611 SK |
181 | priv = devm_kzalloc(&pdev->dev, sizeof_gpio_leds_priv(count), |
182 | GFP_KERNEL); | |
a314c5c0 GL |
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]); | |
a314c5c0 GL |
219 | return NULL; |
220 | } | |
a7d878af | 221 | |
a314c5c0 GL |
222 | static const struct of_device_id of_gpio_leds_match[] = { |
223 | { .compatible = "gpio-leds", }, | |
224 | {}, | |
225 | }; | |
2bcc7ed5 | 226 | #else /* CONFIG_OF_GPIO */ |
a314c5c0 GL |
227 | static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev) |
228 | { | |
229 | return NULL; | |
230 | } | |
231 | #define of_gpio_leds_match NULL | |
2bcc7ed5 | 232 | #endif /* CONFIG_OF_GPIO */ |
a7d878af | 233 | |
a314c5c0 GL |
234 | |
235 | static int __devinit gpio_led_probe(struct platform_device *pdev) | |
236 | { | |
237 | struct gpio_led_platform_data *pdata = pdev->dev.platform_data; | |
238 | struct gpio_leds_priv *priv; | |
239 | int i, ret = 0; | |
240 | ||
241 | if (pdata && pdata->num_leds) { | |
198b8611 SK |
242 | priv = devm_kzalloc(&pdev->dev, |
243 | sizeof_gpio_leds_priv(pdata->num_leds), | |
244 | GFP_KERNEL); | |
a314c5c0 GL |
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]); | |
a314c5c0 GL |
257 | return ret; |
258 | } | |
259 | } | |
260 | } else { | |
261 | priv = gpio_leds_create_of(pdev); | |
262 | if (!priv) | |
263 | return -ENODEV; | |
264 | } | |
265 | ||
266 | platform_set_drvdata(pdev, priv); | |
267 | ||
268 | return 0; | |
a7d878af TP |
269 | } |
270 | ||
a314c5c0 | 271 | static int __devexit gpio_led_remove(struct platform_device *pdev) |
a7d878af | 272 | { |
a314c5c0 | 273 | struct gpio_leds_priv *priv = dev_get_drvdata(&pdev->dev); |
a7d878af TP |
274 | int i; |
275 | ||
a314c5c0 GL |
276 | for (i = 0; i < priv->num_leds; i++) |
277 | delete_gpio_led(&priv->leds[i]); | |
a7d878af | 278 | |
a314c5c0 | 279 | dev_set_drvdata(&pdev->dev, NULL); |
a7d878af TP |
280 | |
281 | return 0; | |
282 | } | |
283 | ||
a314c5c0 GL |
284 | static struct platform_driver gpio_led_driver = { |
285 | .probe = gpio_led_probe, | |
286 | .remove = __devexit_p(gpio_led_remove), | |
287 | .driver = { | |
288 | .name = "leds-gpio", | |
289 | .owner = THIS_MODULE, | |
4018294b | 290 | .of_match_table = of_gpio_leds_match, |
a7d878af | 291 | }, |
a7d878af | 292 | }; |
a314c5c0 | 293 | |
892a8843 | 294 | module_platform_driver(gpio_led_driver); |
a7d878af TP |
295 | |
296 | MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>"); | |
22e03f3b RA |
297 | MODULE_DESCRIPTION("GPIO LED driver"); |
298 | MODULE_LICENSE("GPL"); | |
892a8843 | 299 | MODULE_ALIAS("platform:leds-gpio"); |