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> | |
22e03f3b | 14 | #include <linux/platform_device.h> |
16db7f90 | 15 | #include <linux/gpio.h> |
22e03f3b | 16 | #include <linux/leds.h> |
c68f46dd | 17 | #include <linux/of.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> |
04553e92 | 23 | #include <linux/err.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 | ||
98ea1ea2 | 94 | static int create_gpio_led(const struct gpio_led *template, |
a7d878af | 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)) { | |
39de81a9 | 104 | dev_info(parent, "Skipping unavailable LED gpio %d (%s)\n", |
d379ee8a | 105 | template->gpio, template->name); |
ac15e950 | 106 | return 0; |
d379ee8a DB |
107 | } |
108 | ||
803d19d5 TT |
109 | ret = devm_gpio_request(parent, template->gpio, template->name); |
110 | if (ret < 0) | |
111 | return ret; | |
112 | ||
a7d878af TP |
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 | |
803d19d5 | 132 | ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state); |
a7d878af | 133 | if (ret < 0) |
a99d76f9 JH |
134 | return ret; |
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) | |
e3b1d44c | 140 | return ret; |
a7d878af TP |
141 | |
142 | return 0; | |
a7d878af TP |
143 | } |
144 | ||
145 | static void delete_gpio_led(struct gpio_led_data *led) | |
146 | { | |
d379ee8a DB |
147 | if (!gpio_is_valid(led->gpio)) |
148 | return; | |
a7d878af TP |
149 | led_classdev_unregister(&led->cdev); |
150 | cancel_work_sync(&led->work); | |
a7d878af TP |
151 | } |
152 | ||
a314c5c0 GL |
153 | struct gpio_leds_priv { |
154 | int num_leds; | |
155 | struct gpio_led_data leds[]; | |
156 | }; | |
22e03f3b | 157 | |
a314c5c0 | 158 | static inline int sizeof_gpio_leds_priv(int num_leds) |
22e03f3b | 159 | { |
a314c5c0 GL |
160 | return sizeof(struct gpio_leds_priv) + |
161 | (sizeof(struct gpio_led_data) * num_leds); | |
22e03f3b RA |
162 | } |
163 | ||
a7d878af | 164 | /* Code to create from OpenFirmware platform devices */ |
2bcc7ed5 | 165 | #ifdef CONFIG_OF_GPIO |
98ea1ea2 | 166 | static struct gpio_leds_priv *gpio_leds_create_of(struct platform_device *pdev) |
a7d878af | 167 | { |
a314c5c0 GL |
168 | struct device_node *np = pdev->dev.of_node, *child; |
169 | struct gpio_leds_priv *priv; | |
127aedc8 | 170 | int count, ret; |
a7d878af | 171 | |
a314c5c0 | 172 | /* count LEDs in this device, so we know how much to allocate */ |
b0bb83df | 173 | count = of_get_available_child_count(np); |
a7d878af | 174 | if (!count) |
04553e92 RS |
175 | return ERR_PTR(-ENODEV); |
176 | ||
b0bb83df | 177 | for_each_available_child_of_node(np, child) |
04553e92 RS |
178 | if (of_get_gpio(child, 0) == -EPROBE_DEFER) |
179 | return ERR_PTR(-EPROBE_DEFER); | |
a7d878af | 180 | |
198b8611 SK |
181 | priv = devm_kzalloc(&pdev->dev, sizeof_gpio_leds_priv(count), |
182 | GFP_KERNEL); | |
a314c5c0 | 183 | if (!priv) |
04553e92 | 184 | return ERR_PTR(-ENOMEM); |
a7d878af | 185 | |
b0bb83df | 186 | for_each_available_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 | |
4270a78d RG |
206 | if (of_get_property(child, "retain-state-suspended", NULL)) |
207 | led.retain_state_suspended = 1; | |
208 | ||
a314c5c0 GL |
209 | ret = create_gpio_led(&led, &priv->leds[priv->num_leds++], |
210 | &pdev->dev, NULL); | |
a7d878af TP |
211 | if (ret < 0) { |
212 | of_node_put(child); | |
213 | goto err; | |
214 | } | |
215 | } | |
216 | ||
a314c5c0 | 217 | return priv; |
a7d878af TP |
218 | |
219 | err: | |
a314c5c0 GL |
220 | for (count = priv->num_leds - 2; count >= 0; count--) |
221 | delete_gpio_led(&priv->leds[count]); | |
04553e92 | 222 | return ERR_PTR(-ENODEV); |
a314c5c0 | 223 | } |
a7d878af | 224 | |
a314c5c0 GL |
225 | static const struct of_device_id of_gpio_leds_match[] = { |
226 | { .compatible = "gpio-leds", }, | |
227 | {}, | |
228 | }; | |
472b854b PP |
229 | |
230 | MODULE_DEVICE_TABLE(of, of_gpio_leds_match); | |
2bcc7ed5 | 231 | #else /* CONFIG_OF_GPIO */ |
98ea1ea2 | 232 | static struct gpio_leds_priv *gpio_leds_create_of(struct platform_device *pdev) |
a314c5c0 | 233 | { |
04553e92 | 234 | return ERR_PTR(-ENODEV); |
a314c5c0 | 235 | } |
2bcc7ed5 | 236 | #endif /* CONFIG_OF_GPIO */ |
a7d878af | 237 | |
a314c5c0 | 238 | |
98ea1ea2 | 239 | static int gpio_led_probe(struct platform_device *pdev) |
a314c5c0 | 240 | { |
87aae1ea | 241 | struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev); |
a314c5c0 GL |
242 | struct gpio_leds_priv *priv; |
243 | int i, ret = 0; | |
244 | ||
8fe4554f | 245 | |
a314c5c0 | 246 | if (pdata && pdata->num_leds) { |
198b8611 SK |
247 | priv = devm_kzalloc(&pdev->dev, |
248 | sizeof_gpio_leds_priv(pdata->num_leds), | |
249 | GFP_KERNEL); | |
a314c5c0 GL |
250 | if (!priv) |
251 | return -ENOMEM; | |
252 | ||
253 | priv->num_leds = pdata->num_leds; | |
254 | for (i = 0; i < priv->num_leds; i++) { | |
255 | ret = create_gpio_led(&pdata->leds[i], | |
256 | &priv->leds[i], | |
257 | &pdev->dev, pdata->gpio_blink_set); | |
258 | if (ret < 0) { | |
259 | /* On failure: unwind the led creations */ | |
260 | for (i = i - 1; i >= 0; i--) | |
261 | delete_gpio_led(&priv->leds[i]); | |
a314c5c0 GL |
262 | return ret; |
263 | } | |
264 | } | |
265 | } else { | |
266 | priv = gpio_leds_create_of(pdev); | |
04553e92 RS |
267 | if (IS_ERR(priv)) |
268 | return PTR_ERR(priv); | |
a314c5c0 GL |
269 | } |
270 | ||
271 | platform_set_drvdata(pdev, priv); | |
272 | ||
273 | return 0; | |
a7d878af TP |
274 | } |
275 | ||
678e8a6b | 276 | static int gpio_led_remove(struct platform_device *pdev) |
a7d878af | 277 | { |
59c4dce1 | 278 | struct gpio_leds_priv *priv = platform_get_drvdata(pdev); |
a7d878af TP |
279 | int i; |
280 | ||
a314c5c0 GL |
281 | for (i = 0; i < priv->num_leds; i++) |
282 | delete_gpio_led(&priv->leds[i]); | |
a7d878af | 283 | |
a7d878af TP |
284 | return 0; |
285 | } | |
286 | ||
a314c5c0 GL |
287 | static struct platform_driver gpio_led_driver = { |
288 | .probe = gpio_led_probe, | |
df07cf81 | 289 | .remove = gpio_led_remove, |
a314c5c0 GL |
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"); |