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> |
04553e92 | 24 | #include <linux/err.h> |
00852279 | 25 | |
22e03f3b RA |
26 | struct gpio_led_data { |
27 | struct led_classdev cdev; | |
28 | unsigned gpio; | |
00852279 DB |
29 | struct work_struct work; |
30 | u8 new_level; | |
31 | u8 can_sleep; | |
22e03f3b | 32 | u8 active_low; |
2146325d BH |
33 | u8 blinking; |
34 | int (*platform_gpio_blink_set)(unsigned gpio, int state, | |
ca3259b3 | 35 | unsigned long *delay_on, unsigned long *delay_off); |
22e03f3b RA |
36 | }; |
37 | ||
00852279 DB |
38 | static void gpio_led_work(struct work_struct *work) |
39 | { | |
40 | struct gpio_led_data *led_dat = | |
41 | container_of(work, struct gpio_led_data, work); | |
42 | ||
2146325d BH |
43 | if (led_dat->blinking) { |
44 | led_dat->platform_gpio_blink_set(led_dat->gpio, | |
45 | led_dat->new_level, | |
46 | NULL, NULL); | |
47 | led_dat->blinking = 0; | |
48 | } else | |
49 | gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level); | |
00852279 | 50 | } |
22e03f3b RA |
51 | |
52 | static void gpio_led_set(struct led_classdev *led_cdev, | |
53 | enum led_brightness value) | |
54 | { | |
55 | struct gpio_led_data *led_dat = | |
56 | container_of(led_cdev, struct gpio_led_data, cdev); | |
57 | int level; | |
58 | ||
59 | if (value == LED_OFF) | |
60 | level = 0; | |
61 | else | |
62 | level = 1; | |
63 | ||
64 | if (led_dat->active_low) | |
65 | level = !level; | |
66 | ||
306dd85c DB |
67 | /* Setting GPIOs with I2C/etc requires a task context, and we don't |
68 | * seem to have a reliable way to know if we're already in one; so | |
69 | * let's just assume the worst. | |
70 | */ | |
00852279 | 71 | if (led_dat->can_sleep) { |
306dd85c DB |
72 | led_dat->new_level = level; |
73 | schedule_work(&led_dat->work); | |
2146325d BH |
74 | } else { |
75 | if (led_dat->blinking) { | |
76 | led_dat->platform_gpio_blink_set(led_dat->gpio, level, | |
77 | NULL, NULL); | |
78 | led_dat->blinking = 0; | |
79 | } else | |
80 | gpio_set_value(led_dat->gpio, level); | |
81 | } | |
22e03f3b RA |
82 | } |
83 | ||
ca3259b3 HVR |
84 | static int gpio_blink_set(struct led_classdev *led_cdev, |
85 | unsigned long *delay_on, unsigned long *delay_off) | |
86 | { | |
87 | struct gpio_led_data *led_dat = | |
88 | container_of(led_cdev, struct gpio_led_data, cdev); | |
89 | ||
2146325d BH |
90 | led_dat->blinking = 1; |
91 | return led_dat->platform_gpio_blink_set(led_dat->gpio, GPIO_LED_BLINK, | |
92 | delay_on, delay_off); | |
ca3259b3 HVR |
93 | } |
94 | ||
a7d878af TP |
95 | static int __devinit create_gpio_led(const struct gpio_led *template, |
96 | struct gpio_led_data *led_dat, struct device *parent, | |
2146325d | 97 | int (*blink_set)(unsigned, int, unsigned long *, unsigned long *)) |
a7d878af | 98 | { |
ed88bae6 | 99 | int ret, state; |
a7d878af | 100 | |
0b4634fc DES |
101 | led_dat->gpio = -1; |
102 | ||
d379ee8a DB |
103 | /* skip leds that aren't available */ |
104 | if (!gpio_is_valid(template->gpio)) { | |
2fea0922 | 105 | printk(KERN_INFO "Skipping unavailable LED gpio %d (%s)\n", |
d379ee8a | 106 | template->gpio, template->name); |
ac15e950 | 107 | return 0; |
d379ee8a DB |
108 | } |
109 | ||
a7d878af TP |
110 | led_dat->cdev.name = template->name; |
111 | led_dat->cdev.default_trigger = template->default_trigger; | |
112 | led_dat->gpio = template->gpio; | |
113 | led_dat->can_sleep = gpio_cansleep(template->gpio); | |
114 | led_dat->active_low = template->active_low; | |
2146325d | 115 | led_dat->blinking = 0; |
a7d878af TP |
116 | if (blink_set) { |
117 | led_dat->platform_gpio_blink_set = blink_set; | |
118 | led_dat->cdev.blink_set = gpio_blink_set; | |
119 | } | |
120 | led_dat->cdev.brightness_set = gpio_led_set; | |
ed88bae6 | 121 | if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) |
dabc69c2 | 122 | state = !!gpio_get_value_cansleep(led_dat->gpio) ^ led_dat->active_low; |
ed88bae6 TP |
123 | else |
124 | state = (template->default_state == LEDS_GPIO_DEFSTATE_ON); | |
125 | led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; | |
defb512d RP |
126 | if (!template->retain_state_suspended) |
127 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; | |
a7d878af | 128 | |
e3b1d44c | 129 | ret = devm_gpio_request_one(parent, template->gpio, |
a99d76f9 JH |
130 | GPIOF_DIR_OUT | (led_dat->active_low ^ state), |
131 | template->name); | |
a7d878af | 132 | if (ret < 0) |
a99d76f9 JH |
133 | return ret; |
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) | |
e3b1d44c | 139 | return ret; |
a7d878af TP |
140 | |
141 | return 0; | |
a7d878af TP |
142 | } |
143 | ||
144 | static void delete_gpio_led(struct gpio_led_data *led) | |
145 | { | |
d379ee8a DB |
146 | if (!gpio_is_valid(led->gpio)) |
147 | return; | |
a7d878af TP |
148 | led_classdev_unregister(&led->cdev); |
149 | cancel_work_sync(&led->work); | |
a7d878af TP |
150 | } |
151 | ||
a314c5c0 GL |
152 | struct gpio_leds_priv { |
153 | int num_leds; | |
154 | struct gpio_led_data leds[]; | |
155 | }; | |
22e03f3b | 156 | |
a314c5c0 | 157 | static inline int sizeof_gpio_leds_priv(int num_leds) |
22e03f3b | 158 | { |
a314c5c0 GL |
159 | return sizeof(struct gpio_leds_priv) + |
160 | (sizeof(struct gpio_led_data) * num_leds); | |
22e03f3b RA |
161 | } |
162 | ||
a7d878af | 163 | /* Code to create from OpenFirmware platform devices */ |
2bcc7ed5 | 164 | #ifdef CONFIG_OF_GPIO |
a314c5c0 | 165 | static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev) |
a7d878af | 166 | { |
a314c5c0 GL |
167 | struct device_node *np = pdev->dev.of_node, *child; |
168 | struct gpio_leds_priv *priv; | |
127aedc8 | 169 | int count, ret; |
a7d878af | 170 | |
a314c5c0 | 171 | /* count LEDs in this device, so we know how much to allocate */ |
127aedc8 | 172 | count = of_get_child_count(np); |
a7d878af | 173 | if (!count) |
04553e92 RS |
174 | return ERR_PTR(-ENODEV); |
175 | ||
176 | for_each_child_of_node(np, child) | |
177 | if (of_get_gpio(child, 0) == -EPROBE_DEFER) | |
178 | return ERR_PTR(-EPROBE_DEFER); | |
a7d878af | 179 | |
198b8611 SK |
180 | priv = devm_kzalloc(&pdev->dev, sizeof_gpio_leds_priv(count), |
181 | GFP_KERNEL); | |
a314c5c0 | 182 | if (!priv) |
04553e92 | 183 | return ERR_PTR(-ENOMEM); |
a7d878af | 184 | |
a7d878af | 185 | for_each_child_of_node(np, child) { |
0493a4ff | 186 | struct gpio_led led = {}; |
a7d878af | 187 | enum of_gpio_flags flags; |
ed88bae6 | 188 | const char *state; |
a7d878af TP |
189 | |
190 | led.gpio = of_get_gpio_flags(child, 0, &flags); | |
191 | led.active_low = flags & OF_GPIO_ACTIVE_LOW; | |
192 | led.name = of_get_property(child, "label", NULL) ? : child->name; | |
193 | led.default_trigger = | |
194 | of_get_property(child, "linux,default-trigger", NULL); | |
ed88bae6 TP |
195 | state = of_get_property(child, "default-state", NULL); |
196 | if (state) { | |
197 | if (!strcmp(state, "keep")) | |
198 | led.default_state = LEDS_GPIO_DEFSTATE_KEEP; | |
a314c5c0 | 199 | else if (!strcmp(state, "on")) |
ed88bae6 TP |
200 | led.default_state = LEDS_GPIO_DEFSTATE_ON; |
201 | else | |
202 | led.default_state = LEDS_GPIO_DEFSTATE_OFF; | |
203 | } | |
a7d878af | 204 | |
a314c5c0 GL |
205 | ret = create_gpio_led(&led, &priv->leds[priv->num_leds++], |
206 | &pdev->dev, NULL); | |
a7d878af TP |
207 | if (ret < 0) { |
208 | of_node_put(child); | |
209 | goto err; | |
210 | } | |
211 | } | |
212 | ||
a314c5c0 | 213 | return priv; |
a7d878af TP |
214 | |
215 | err: | |
a314c5c0 GL |
216 | for (count = priv->num_leds - 2; count >= 0; count--) |
217 | delete_gpio_led(&priv->leds[count]); | |
04553e92 | 218 | return ERR_PTR(-ENODEV); |
a314c5c0 | 219 | } |
a7d878af | 220 | |
a314c5c0 GL |
221 | static const struct of_device_id of_gpio_leds_match[] = { |
222 | { .compatible = "gpio-leds", }, | |
223 | {}, | |
224 | }; | |
2bcc7ed5 | 225 | #else /* CONFIG_OF_GPIO */ |
a314c5c0 GL |
226 | static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev) |
227 | { | |
04553e92 | 228 | return ERR_PTR(-ENODEV); |
a314c5c0 | 229 | } |
2bcc7ed5 | 230 | #endif /* CONFIG_OF_GPIO */ |
a7d878af | 231 | |
a314c5c0 GL |
232 | |
233 | static int __devinit gpio_led_probe(struct platform_device *pdev) | |
234 | { | |
235 | struct gpio_led_platform_data *pdata = pdev->dev.platform_data; | |
236 | struct gpio_leds_priv *priv; | |
8fe4554f | 237 | struct pinctrl *pinctrl; |
a314c5c0 GL |
238 | int i, ret = 0; |
239 | ||
8fe4554f AC |
240 | pinctrl = devm_pinctrl_get_select_default(&pdev->dev); |
241 | if (IS_ERR(pinctrl)) | |
242 | dev_warn(&pdev->dev, | |
243 | "pins are not configured from the driver\n"); | |
244 | ||
a314c5c0 | 245 | if (pdata && pdata->num_leds) { |
198b8611 SK |
246 | priv = devm_kzalloc(&pdev->dev, |
247 | sizeof_gpio_leds_priv(pdata->num_leds), | |
248 | GFP_KERNEL); | |
a314c5c0 GL |
249 | if (!priv) |
250 | return -ENOMEM; | |
251 | ||
252 | priv->num_leds = pdata->num_leds; | |
253 | for (i = 0; i < priv->num_leds; i++) { | |
254 | ret = create_gpio_led(&pdata->leds[i], | |
255 | &priv->leds[i], | |
256 | &pdev->dev, pdata->gpio_blink_set); | |
257 | if (ret < 0) { | |
258 | /* On failure: unwind the led creations */ | |
259 | for (i = i - 1; i >= 0; i--) | |
260 | delete_gpio_led(&priv->leds[i]); | |
a314c5c0 GL |
261 | return ret; |
262 | } | |
263 | } | |
264 | } else { | |
265 | priv = gpio_leds_create_of(pdev); | |
04553e92 RS |
266 | if (IS_ERR(priv)) |
267 | return PTR_ERR(priv); | |
a314c5c0 GL |
268 | } |
269 | ||
270 | platform_set_drvdata(pdev, priv); | |
271 | ||
272 | return 0; | |
a7d878af TP |
273 | } |
274 | ||
a314c5c0 | 275 | static int __devexit gpio_led_remove(struct platform_device *pdev) |
a7d878af | 276 | { |
59c4dce1 | 277 | struct gpio_leds_priv *priv = platform_get_drvdata(pdev); |
a7d878af TP |
278 | int i; |
279 | ||
a314c5c0 GL |
280 | for (i = 0; i < priv->num_leds; i++) |
281 | delete_gpio_led(&priv->leds[i]); | |
a7d878af | 282 | |
59c4dce1 | 283 | platform_set_drvdata(pdev, NULL); |
a7d878af TP |
284 | |
285 | return 0; | |
286 | } | |
287 | ||
a314c5c0 GL |
288 | static struct platform_driver gpio_led_driver = { |
289 | .probe = gpio_led_probe, | |
290 | .remove = __devexit_p(gpio_led_remove), | |
291 | .driver = { | |
292 | .name = "leds-gpio", | |
293 | .owner = THIS_MODULE, | |
6ebcebdd | 294 | .of_match_table = of_match_ptr(of_gpio_leds_match), |
a7d878af | 295 | }, |
a7d878af | 296 | }; |
a314c5c0 | 297 | |
892a8843 | 298 | module_platform_driver(gpio_led_driver); |
a7d878af TP |
299 | |
300 | MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>"); | |
22e03f3b RA |
301 | MODULE_DESCRIPTION("GPIO LED driver"); |
302 | MODULE_LICENSE("GPL"); | |
892a8843 | 303 | MODULE_ALIAS("platform:leds-gpio"); |