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> |
8fe4554f | 23 | #include <linux/pinctrl/consumer.h> |
00852279 | 24 | |
22e03f3b RA |
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 | led_dat->cdev.name = template->name; |
110 | led_dat->cdev.default_trigger = template->default_trigger; | |
111 | led_dat->gpio = template->gpio; | |
112 | led_dat->can_sleep = gpio_cansleep(template->gpio); | |
113 | led_dat->active_low = template->active_low; | |
2146325d | 114 | led_dat->blinking = 0; |
a7d878af TP |
115 | if (blink_set) { |
116 | led_dat->platform_gpio_blink_set = blink_set; | |
117 | led_dat->cdev.blink_set = gpio_blink_set; | |
118 | } | |
119 | led_dat->cdev.brightness_set = gpio_led_set; | |
ed88bae6 | 120 | if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) |
dabc69c2 | 121 | state = !!gpio_get_value_cansleep(led_dat->gpio) ^ led_dat->active_low; |
ed88bae6 TP |
122 | else |
123 | state = (template->default_state == LEDS_GPIO_DEFSTATE_ON); | |
124 | led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; | |
defb512d RP |
125 | if (!template->retain_state_suspended) |
126 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; | |
a7d878af | 127 | |
a99d76f9 JH |
128 | ret = gpio_request_one(template->gpio, |
129 | GPIOF_DIR_OUT | (led_dat->active_low ^ state), | |
130 | template->name); | |
a7d878af | 131 | if (ret < 0) |
a99d76f9 JH |
132 | return ret; |
133 | ||
a7d878af TP |
134 | INIT_WORK(&led_dat->work, gpio_led_work); |
135 | ||
136 | ret = led_classdev_register(parent, &led_dat->cdev); | |
137 | if (ret < 0) | |
138 | goto err; | |
139 | ||
140 | return 0; | |
141 | err: | |
142 | gpio_free(led_dat->gpio); | |
143 | return ret; | |
144 | } | |
145 | ||
146 | static void delete_gpio_led(struct gpio_led_data *led) | |
147 | { | |
d379ee8a DB |
148 | if (!gpio_is_valid(led->gpio)) |
149 | return; | |
a7d878af TP |
150 | led_classdev_unregister(&led->cdev); |
151 | cancel_work_sync(&led->work); | |
152 | gpio_free(led->gpio); | |
153 | } | |
154 | ||
a314c5c0 GL |
155 | struct gpio_leds_priv { |
156 | int num_leds; | |
157 | struct gpio_led_data leds[]; | |
158 | }; | |
22e03f3b | 159 | |
a314c5c0 | 160 | static inline int sizeof_gpio_leds_priv(int num_leds) |
22e03f3b | 161 | { |
a314c5c0 GL |
162 | return sizeof(struct gpio_leds_priv) + |
163 | (sizeof(struct gpio_led_data) * num_leds); | |
22e03f3b RA |
164 | } |
165 | ||
a7d878af | 166 | /* Code to create from OpenFirmware platform devices */ |
2bcc7ed5 | 167 | #ifdef CONFIG_OF_GPIO |
a314c5c0 | 168 | static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev) |
a7d878af | 169 | { |
a314c5c0 GL |
170 | struct device_node *np = pdev->dev.of_node, *child; |
171 | struct gpio_leds_priv *priv; | |
127aedc8 | 172 | int count, ret; |
a7d878af | 173 | |
a314c5c0 | 174 | /* count LEDs in this device, so we know how much to allocate */ |
127aedc8 | 175 | count = of_get_child_count(np); |
a7d878af | 176 | if (!count) |
a314c5c0 | 177 | return NULL; |
a7d878af | 178 | |
198b8611 SK |
179 | priv = devm_kzalloc(&pdev->dev, sizeof_gpio_leds_priv(count), |
180 | GFP_KERNEL); | |
a314c5c0 GL |
181 | if (!priv) |
182 | return NULL; | |
a7d878af | 183 | |
a7d878af | 184 | for_each_child_of_node(np, child) { |
0493a4ff | 185 | struct gpio_led led = {}; |
a7d878af | 186 | enum of_gpio_flags flags; |
ed88bae6 | 187 | const char *state; |
a7d878af TP |
188 | |
189 | led.gpio = of_get_gpio_flags(child, 0, &flags); | |
190 | led.active_low = flags & OF_GPIO_ACTIVE_LOW; | |
191 | led.name = of_get_property(child, "label", NULL) ? : child->name; | |
192 | led.default_trigger = | |
193 | of_get_property(child, "linux,default-trigger", NULL); | |
ed88bae6 TP |
194 | state = of_get_property(child, "default-state", NULL); |
195 | if (state) { | |
196 | if (!strcmp(state, "keep")) | |
197 | led.default_state = LEDS_GPIO_DEFSTATE_KEEP; | |
a314c5c0 | 198 | else if (!strcmp(state, "on")) |
ed88bae6 TP |
199 | led.default_state = LEDS_GPIO_DEFSTATE_ON; |
200 | else | |
201 | led.default_state = LEDS_GPIO_DEFSTATE_OFF; | |
202 | } | |
a7d878af | 203 | |
a314c5c0 GL |
204 | ret = create_gpio_led(&led, &priv->leds[priv->num_leds++], |
205 | &pdev->dev, NULL); | |
a7d878af TP |
206 | if (ret < 0) { |
207 | of_node_put(child); | |
208 | goto err; | |
209 | } | |
210 | } | |
211 | ||
a314c5c0 | 212 | return priv; |
a7d878af TP |
213 | |
214 | err: | |
a314c5c0 GL |
215 | for (count = priv->num_leds - 2; count >= 0; count--) |
216 | delete_gpio_led(&priv->leds[count]); | |
a314c5c0 GL |
217 | return NULL; |
218 | } | |
a7d878af | 219 | |
a314c5c0 GL |
220 | static const struct of_device_id of_gpio_leds_match[] = { |
221 | { .compatible = "gpio-leds", }, | |
222 | {}, | |
223 | }; | |
2bcc7ed5 | 224 | #else /* CONFIG_OF_GPIO */ |
a314c5c0 GL |
225 | static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev) |
226 | { | |
227 | return NULL; | |
228 | } | |
2bcc7ed5 | 229 | #endif /* CONFIG_OF_GPIO */ |
a7d878af | 230 | |
a314c5c0 GL |
231 | |
232 | static int __devinit gpio_led_probe(struct platform_device *pdev) | |
233 | { | |
234 | struct gpio_led_platform_data *pdata = pdev->dev.platform_data; | |
235 | struct gpio_leds_priv *priv; | |
8fe4554f | 236 | struct pinctrl *pinctrl; |
a314c5c0 GL |
237 | int i, ret = 0; |
238 | ||
8fe4554f AC |
239 | pinctrl = devm_pinctrl_get_select_default(&pdev->dev); |
240 | if (IS_ERR(pinctrl)) | |
241 | dev_warn(&pdev->dev, | |
242 | "pins are not configured from the driver\n"); | |
243 | ||
a314c5c0 | 244 | if (pdata && pdata->num_leds) { |
198b8611 SK |
245 | priv = devm_kzalloc(&pdev->dev, |
246 | sizeof_gpio_leds_priv(pdata->num_leds), | |
247 | GFP_KERNEL); | |
a314c5c0 GL |
248 | if (!priv) |
249 | return -ENOMEM; | |
250 | ||
251 | priv->num_leds = pdata->num_leds; | |
252 | for (i = 0; i < priv->num_leds; i++) { | |
253 | ret = create_gpio_led(&pdata->leds[i], | |
254 | &priv->leds[i], | |
255 | &pdev->dev, pdata->gpio_blink_set); | |
256 | if (ret < 0) { | |
257 | /* On failure: unwind the led creations */ | |
258 | for (i = i - 1; i >= 0; i--) | |
259 | delete_gpio_led(&priv->leds[i]); | |
a314c5c0 GL |
260 | return ret; |
261 | } | |
262 | } | |
263 | } else { | |
264 | priv = gpio_leds_create_of(pdev); | |
265 | if (!priv) | |
266 | return -ENODEV; | |
267 | } | |
268 | ||
269 | platform_set_drvdata(pdev, priv); | |
270 | ||
271 | return 0; | |
a7d878af TP |
272 | } |
273 | ||
a314c5c0 | 274 | static int __devexit gpio_led_remove(struct platform_device *pdev) |
a7d878af | 275 | { |
59c4dce1 | 276 | struct gpio_leds_priv *priv = platform_get_drvdata(pdev); |
a7d878af TP |
277 | int i; |
278 | ||
a314c5c0 GL |
279 | for (i = 0; i < priv->num_leds; i++) |
280 | delete_gpio_led(&priv->leds[i]); | |
a7d878af | 281 | |
59c4dce1 | 282 | platform_set_drvdata(pdev, NULL); |
a7d878af TP |
283 | |
284 | return 0; | |
285 | } | |
286 | ||
a314c5c0 GL |
287 | static struct platform_driver gpio_led_driver = { |
288 | .probe = gpio_led_probe, | |
289 | .remove = __devexit_p(gpio_led_remove), | |
290 | .driver = { | |
291 | .name = "leds-gpio", | |
292 | .owner = THIS_MODULE, | |
6ebcebdd | 293 | .of_match_table = of_match_ptr(of_gpio_leds_match), |
a7d878af | 294 | }, |
a7d878af | 295 | }; |
a314c5c0 | 296 | |
892a8843 | 297 | module_platform_driver(gpio_led_driver); |
a7d878af TP |
298 | |
299 | MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>"); | |
22e03f3b RA |
300 | MODULE_DESCRIPTION("GPIO LED driver"); |
301 | MODULE_LICENSE("GPL"); | |
892a8843 | 302 | MODULE_ALIAS("platform:leds-gpio"); |