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> |
c68f46dd | 18 | #include <linux/of.h> |
a314c5c0 GL |
19 | #include <linux/of_platform.h> |
20 | #include <linux/of_gpio.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
00852279 | 22 | #include <linux/workqueue.h> |
54f4dedb | 23 | #include <linux/module.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 | ||
98ea1ea2 | 95 | static int create_gpio_led(const struct gpio_led *template, |
a7d878af | 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)) { | |
39de81a9 | 105 | dev_info(parent, "Skipping unavailable LED gpio %d (%s)\n", |
d379ee8a | 106 | template->gpio, template->name); |
ac15e950 | 107 | return 0; |
d379ee8a DB |
108 | } |
109 | ||
803d19d5 TT |
110 | ret = devm_gpio_request(parent, template->gpio, template->name); |
111 | if (ret < 0) | |
112 | return ret; | |
113 | ||
a7d878af TP |
114 | led_dat->cdev.name = template->name; |
115 | led_dat->cdev.default_trigger = template->default_trigger; | |
116 | led_dat->gpio = template->gpio; | |
117 | led_dat->can_sleep = gpio_cansleep(template->gpio); | |
118 | led_dat->active_low = template->active_low; | |
2146325d | 119 | led_dat->blinking = 0; |
a7d878af TP |
120 | if (blink_set) { |
121 | led_dat->platform_gpio_blink_set = blink_set; | |
122 | led_dat->cdev.blink_set = gpio_blink_set; | |
123 | } | |
124 | led_dat->cdev.brightness_set = gpio_led_set; | |
ed88bae6 | 125 | if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) |
dabc69c2 | 126 | state = !!gpio_get_value_cansleep(led_dat->gpio) ^ led_dat->active_low; |
ed88bae6 TP |
127 | else |
128 | state = (template->default_state == LEDS_GPIO_DEFSTATE_ON); | |
129 | led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; | |
defb512d RP |
130 | if (!template->retain_state_suspended) |
131 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; | |
a7d878af | 132 | |
803d19d5 | 133 | ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state); |
a7d878af | 134 | if (ret < 0) |
a99d76f9 JH |
135 | return ret; |
136 | ||
a7d878af TP |
137 | INIT_WORK(&led_dat->work, gpio_led_work); |
138 | ||
139 | ret = led_classdev_register(parent, &led_dat->cdev); | |
140 | if (ret < 0) | |
e3b1d44c | 141 | return ret; |
a7d878af TP |
142 | |
143 | return 0; | |
a7d878af TP |
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); | |
a7d878af TP |
152 | } |
153 | ||
a314c5c0 GL |
154 | struct gpio_leds_priv { |
155 | int num_leds; | |
156 | struct gpio_led_data leds[]; | |
157 | }; | |
22e03f3b | 158 | |
a314c5c0 | 159 | static inline int sizeof_gpio_leds_priv(int num_leds) |
22e03f3b | 160 | { |
a314c5c0 GL |
161 | return sizeof(struct gpio_leds_priv) + |
162 | (sizeof(struct gpio_led_data) * num_leds); | |
22e03f3b RA |
163 | } |
164 | ||
a7d878af | 165 | /* Code to create from OpenFirmware platform devices */ |
2bcc7ed5 | 166 | #ifdef CONFIG_OF_GPIO |
98ea1ea2 | 167 | static struct gpio_leds_priv *gpio_leds_create_of(struct platform_device *pdev) |
a7d878af | 168 | { |
a314c5c0 GL |
169 | struct device_node *np = pdev->dev.of_node, *child; |
170 | struct gpio_leds_priv *priv; | |
127aedc8 | 171 | int count, ret; |
a7d878af | 172 | |
a314c5c0 | 173 | /* count LEDs in this device, so we know how much to allocate */ |
b0bb83df | 174 | count = of_get_available_child_count(np); |
a7d878af | 175 | if (!count) |
04553e92 RS |
176 | return ERR_PTR(-ENODEV); |
177 | ||
b0bb83df | 178 | for_each_available_child_of_node(np, child) |
04553e92 RS |
179 | if (of_get_gpio(child, 0) == -EPROBE_DEFER) |
180 | return ERR_PTR(-EPROBE_DEFER); | |
a7d878af | 181 | |
198b8611 SK |
182 | priv = devm_kzalloc(&pdev->dev, sizeof_gpio_leds_priv(count), |
183 | GFP_KERNEL); | |
a314c5c0 | 184 | if (!priv) |
04553e92 | 185 | return ERR_PTR(-ENOMEM); |
a7d878af | 186 | |
b0bb83df | 187 | for_each_available_child_of_node(np, child) { |
0493a4ff | 188 | struct gpio_led led = {}; |
a7d878af | 189 | enum of_gpio_flags flags; |
ed88bae6 | 190 | const char *state; |
a7d878af TP |
191 | |
192 | led.gpio = of_get_gpio_flags(child, 0, &flags); | |
193 | led.active_low = flags & OF_GPIO_ACTIVE_LOW; | |
194 | led.name = of_get_property(child, "label", NULL) ? : child->name; | |
195 | led.default_trigger = | |
196 | of_get_property(child, "linux,default-trigger", NULL); | |
ed88bae6 TP |
197 | state = of_get_property(child, "default-state", NULL); |
198 | if (state) { | |
199 | if (!strcmp(state, "keep")) | |
200 | led.default_state = LEDS_GPIO_DEFSTATE_KEEP; | |
a314c5c0 | 201 | else if (!strcmp(state, "on")) |
ed88bae6 TP |
202 | led.default_state = LEDS_GPIO_DEFSTATE_ON; |
203 | else | |
204 | led.default_state = LEDS_GPIO_DEFSTATE_OFF; | |
205 | } | |
a7d878af | 206 | |
a314c5c0 GL |
207 | ret = create_gpio_led(&led, &priv->leds[priv->num_leds++], |
208 | &pdev->dev, NULL); | |
a7d878af TP |
209 | if (ret < 0) { |
210 | of_node_put(child); | |
211 | goto err; | |
212 | } | |
213 | } | |
214 | ||
a314c5c0 | 215 | return priv; |
a7d878af TP |
216 | |
217 | err: | |
a314c5c0 GL |
218 | for (count = priv->num_leds - 2; count >= 0; count--) |
219 | delete_gpio_led(&priv->leds[count]); | |
04553e92 | 220 | return ERR_PTR(-ENODEV); |
a314c5c0 | 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 */ |
98ea1ea2 | 228 | static struct gpio_leds_priv *gpio_leds_create_of(struct platform_device *pdev) |
a314c5c0 | 229 | { |
04553e92 | 230 | return ERR_PTR(-ENODEV); |
a314c5c0 | 231 | } |
2bcc7ed5 | 232 | #endif /* CONFIG_OF_GPIO */ |
a7d878af | 233 | |
a314c5c0 | 234 | |
98ea1ea2 | 235 | static int gpio_led_probe(struct platform_device *pdev) |
a314c5c0 | 236 | { |
87aae1ea | 237 | struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev); |
a314c5c0 GL |
238 | struct gpio_leds_priv *priv; |
239 | int i, ret = 0; | |
240 | ||
8fe4554f | 241 | |
a314c5c0 | 242 | if (pdata && pdata->num_leds) { |
198b8611 SK |
243 | priv = devm_kzalloc(&pdev->dev, |
244 | sizeof_gpio_leds_priv(pdata->num_leds), | |
245 | GFP_KERNEL); | |
a314c5c0 GL |
246 | if (!priv) |
247 | return -ENOMEM; | |
248 | ||
249 | priv->num_leds = pdata->num_leds; | |
250 | for (i = 0; i < priv->num_leds; i++) { | |
251 | ret = create_gpio_led(&pdata->leds[i], | |
252 | &priv->leds[i], | |
253 | &pdev->dev, pdata->gpio_blink_set); | |
254 | if (ret < 0) { | |
255 | /* On failure: unwind the led creations */ | |
256 | for (i = i - 1; i >= 0; i--) | |
257 | delete_gpio_led(&priv->leds[i]); | |
a314c5c0 GL |
258 | return ret; |
259 | } | |
260 | } | |
261 | } else { | |
262 | priv = gpio_leds_create_of(pdev); | |
04553e92 RS |
263 | if (IS_ERR(priv)) |
264 | return PTR_ERR(priv); | |
a314c5c0 GL |
265 | } |
266 | ||
267 | platform_set_drvdata(pdev, priv); | |
268 | ||
269 | return 0; | |
a7d878af TP |
270 | } |
271 | ||
678e8a6b | 272 | static int gpio_led_remove(struct platform_device *pdev) |
a7d878af | 273 | { |
59c4dce1 | 274 | struct gpio_leds_priv *priv = platform_get_drvdata(pdev); |
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 | |
a7d878af TP |
280 | return 0; |
281 | } | |
282 | ||
a314c5c0 GL |
283 | static struct platform_driver gpio_led_driver = { |
284 | .probe = gpio_led_probe, | |
df07cf81 | 285 | .remove = gpio_led_remove, |
a314c5c0 GL |
286 | .driver = { |
287 | .name = "leds-gpio", | |
288 | .owner = THIS_MODULE, | |
6ebcebdd | 289 | .of_match_table = of_match_ptr(of_gpio_leds_match), |
a7d878af | 290 | }, |
a7d878af | 291 | }; |
a314c5c0 | 292 | |
892a8843 | 293 | module_platform_driver(gpio_led_driver); |
a7d878af TP |
294 | |
295 | MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>"); | |
22e03f3b RA |
296 | MODULE_DESCRIPTION("GPIO LED driver"); |
297 | MODULE_LICENSE("GPL"); | |
892a8843 | 298 | MODULE_ALIAS("platform:leds-gpio"); |