Commit | Line | Data |
---|---|---|
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 | */ | |
4cc72346 | 13 | #include <linux/err.h> |
16db7f90 | 14 | #include <linux/gpio.h> |
5c51277a | 15 | #include <linux/gpio/consumer.h> |
4cc72346 | 16 | #include <linux/kernel.h> |
22e03f3b | 17 | #include <linux/leds.h> |
4cc72346 | 18 | #include <linux/module.h> |
4cc72346 | 19 | #include <linux/platform_device.h> |
a43f2cbb | 20 | #include <linux/property.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
00852279 DB |
22 | #include <linux/workqueue.h> |
23 | ||
22e03f3b RA |
24 | struct gpio_led_data { |
25 | struct led_classdev cdev; | |
5c51277a | 26 | struct gpio_desc *gpiod; |
00852279 DB |
27 | struct work_struct work; |
28 | u8 new_level; | |
29 | u8 can_sleep; | |
2146325d | 30 | u8 blinking; |
c673a2b4 | 31 | int (*platform_gpio_blink_set)(struct gpio_desc *desc, int state, |
ca3259b3 | 32 | unsigned long *delay_on, unsigned long *delay_off); |
22e03f3b RA |
33 | }; |
34 | ||
00852279 DB |
35 | static void gpio_led_work(struct work_struct *work) |
36 | { | |
a4c84e6a | 37 | struct gpio_led_data *led_dat = |
00852279 DB |
38 | container_of(work, struct gpio_led_data, work); |
39 | ||
2146325d | 40 | if (led_dat->blinking) { |
c673a2b4 MW |
41 | led_dat->platform_gpio_blink_set(led_dat->gpiod, |
42 | led_dat->new_level, NULL, NULL); | |
2146325d BH |
43 | led_dat->blinking = 0; |
44 | } else | |
5c51277a | 45 | gpiod_set_value_cansleep(led_dat->gpiod, led_dat->new_level); |
00852279 | 46 | } |
22e03f3b RA |
47 | |
48 | static void gpio_led_set(struct led_classdev *led_cdev, | |
49 | enum led_brightness value) | |
50 | { | |
51 | struct gpio_led_data *led_dat = | |
52 | container_of(led_cdev, struct gpio_led_data, cdev); | |
53 | int level; | |
54 | ||
55 | if (value == LED_OFF) | |
56 | level = 0; | |
57 | else | |
58 | level = 1; | |
59 | ||
306dd85c DB |
60 | /* Setting GPIOs with I2C/etc requires a task context, and we don't |
61 | * seem to have a reliable way to know if we're already in one; so | |
62 | * let's just assume the worst. | |
63 | */ | |
00852279 | 64 | if (led_dat->can_sleep) { |
306dd85c DB |
65 | led_dat->new_level = level; |
66 | schedule_work(&led_dat->work); | |
2146325d BH |
67 | } else { |
68 | if (led_dat->blinking) { | |
c673a2b4 MW |
69 | led_dat->platform_gpio_blink_set(led_dat->gpiod, level, |
70 | NULL, NULL); | |
2146325d BH |
71 | led_dat->blinking = 0; |
72 | } else | |
5c51277a | 73 | gpiod_set_value(led_dat->gpiod, level); |
2146325d | 74 | } |
22e03f3b RA |
75 | } |
76 | ||
ca3259b3 HVR |
77 | static int gpio_blink_set(struct led_classdev *led_cdev, |
78 | unsigned long *delay_on, unsigned long *delay_off) | |
79 | { | |
80 | struct gpio_led_data *led_dat = | |
81 | container_of(led_cdev, struct gpio_led_data, cdev); | |
82 | ||
2146325d | 83 | led_dat->blinking = 1; |
c673a2b4 | 84 | return led_dat->platform_gpio_blink_set(led_dat->gpiod, GPIO_LED_BLINK, |
2146325d | 85 | delay_on, delay_off); |
ca3259b3 HVR |
86 | } |
87 | ||
98ea1ea2 | 88 | static int create_gpio_led(const struct gpio_led *template, |
a7d878af | 89 | struct gpio_led_data *led_dat, struct device *parent, |
c673a2b4 MW |
90 | int (*blink_set)(struct gpio_desc *, int, unsigned long *, |
91 | unsigned long *)) | |
a7d878af | 92 | { |
ed88bae6 | 93 | int ret, state; |
a7d878af | 94 | |
ec98a497 GU |
95 | led_dat->gpiod = template->gpiod; |
96 | if (!led_dat->gpiod) { | |
c673a2b4 MW |
97 | /* |
98 | * This is the legacy code path for platform code that | |
99 | * still uses GPIO numbers. Ultimately we would like to get | |
100 | * rid of this block completely. | |
101 | */ | |
5c51277a | 102 | unsigned long flags = 0; |
0b4634fc | 103 | |
5c51277a MW |
104 | /* skip leds that aren't available */ |
105 | if (!gpio_is_valid(template->gpio)) { | |
106 | dev_info(parent, "Skipping unavailable LED gpio %d (%s)\n", | |
107 | template->gpio, template->name); | |
108 | return 0; | |
109 | } | |
d379ee8a | 110 | |
5c51277a MW |
111 | if (template->active_low) |
112 | flags |= GPIOF_ACTIVE_LOW; | |
113 | ||
114 | ret = devm_gpio_request_one(parent, template->gpio, flags, | |
115 | template->name); | |
116 | if (ret < 0) | |
117 | return ret; | |
118 | ||
119 | led_dat->gpiod = gpio_to_desc(template->gpio); | |
120 | if (IS_ERR(led_dat->gpiod)) | |
121 | return PTR_ERR(led_dat->gpiod); | |
122 | } | |
803d19d5 | 123 | |
a7d878af TP |
124 | led_dat->cdev.name = template->name; |
125 | led_dat->cdev.default_trigger = template->default_trigger; | |
ec98a497 | 126 | led_dat->can_sleep = gpiod_cansleep(led_dat->gpiod); |
2146325d | 127 | led_dat->blinking = 0; |
a7d878af TP |
128 | if (blink_set) { |
129 | led_dat->platform_gpio_blink_set = blink_set; | |
130 | led_dat->cdev.blink_set = gpio_blink_set; | |
131 | } | |
132 | led_dat->cdev.brightness_set = gpio_led_set; | |
ed88bae6 | 133 | if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) |
5c51277a | 134 | state = !!gpiod_get_value_cansleep(led_dat->gpiod); |
ed88bae6 TP |
135 | else |
136 | state = (template->default_state == LEDS_GPIO_DEFSTATE_ON); | |
137 | led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; | |
defb512d RP |
138 | if (!template->retain_state_suspended) |
139 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; | |
a7d878af | 140 | |
5c51277a | 141 | ret = gpiod_direction_output(led_dat->gpiod, state); |
a7d878af | 142 | if (ret < 0) |
a99d76f9 JH |
143 | return ret; |
144 | ||
a7d878af TP |
145 | INIT_WORK(&led_dat->work, gpio_led_work); |
146 | ||
5c51277a | 147 | return led_classdev_register(parent, &led_dat->cdev); |
a7d878af TP |
148 | } |
149 | ||
150 | static void delete_gpio_led(struct gpio_led_data *led) | |
151 | { | |
152 | led_classdev_unregister(&led->cdev); | |
153 | cancel_work_sync(&led->work); | |
a7d878af TP |
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 | ||
a43f2cbb | 167 | static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev) |
a7d878af | 168 | { |
a43f2cbb RW |
169 | struct device *dev = &pdev->dev; |
170 | struct fwnode_handle *child; | |
a314c5c0 | 171 | struct gpio_leds_priv *priv; |
127aedc8 | 172 | int count, ret; |
29470ea8 | 173 | struct device_node *np; |
a7d878af | 174 | |
a43f2cbb | 175 | count = device_get_child_node_count(dev); |
a7d878af | 176 | if (!count) |
04553e92 RS |
177 | return ERR_PTR(-ENODEV); |
178 | ||
a43f2cbb | 179 | priv = devm_kzalloc(dev, sizeof_gpio_leds_priv(count), GFP_KERNEL); |
a314c5c0 | 180 | if (!priv) |
04553e92 | 181 | return ERR_PTR(-ENOMEM); |
a7d878af | 182 | |
a43f2cbb | 183 | device_for_each_child_node(dev, child) { |
0493a4ff | 184 | struct gpio_led led = {}; |
a43f2cbb RW |
185 | const char *state = NULL; |
186 | ||
187 | led.gpiod = devm_get_gpiod_from_child(dev, child); | |
188 | if (IS_ERR(led.gpiod)) { | |
189 | fwnode_handle_put(child); | |
c6e71f81 | 190 | ret = PTR_ERR(led.gpiod); |
a43f2cbb RW |
191 | goto err; |
192 | } | |
193 | ||
29470ea8 FE |
194 | np = of_node(child); |
195 | ||
196 | if (fwnode_property_present(child, "label")) { | |
197 | fwnode_property_read_string(child, "label", &led.name); | |
198 | } else { | |
199 | if (IS_ENABLED(CONFIG_OF) && !led.name && np) | |
200 | led.name = np->name; | |
201 | if (!led.name) | |
202 | return ERR_PTR(-EINVAL); | |
203 | } | |
a43f2cbb RW |
204 | fwnode_property_read_string(child, "linux,default-trigger", |
205 | &led.default_trigger); | |
206 | ||
d735d25e | 207 | if (!fwnode_property_read_string(child, "default-state", |
a43f2cbb | 208 | &state)) { |
ed88bae6 TP |
209 | if (!strcmp(state, "keep")) |
210 | led.default_state = LEDS_GPIO_DEFSTATE_KEEP; | |
a314c5c0 | 211 | else if (!strcmp(state, "on")) |
ed88bae6 TP |
212 | led.default_state = LEDS_GPIO_DEFSTATE_ON; |
213 | else | |
214 | led.default_state = LEDS_GPIO_DEFSTATE_OFF; | |
215 | } | |
a7d878af | 216 | |
a43f2cbb | 217 | if (fwnode_property_present(child, "retain-state-suspended")) |
4270a78d RG |
218 | led.retain_state_suspended = 1; |
219 | ||
a314c5c0 | 220 | ret = create_gpio_led(&led, &priv->leds[priv->num_leds++], |
a43f2cbb | 221 | dev, NULL); |
a7d878af | 222 | if (ret < 0) { |
a43f2cbb | 223 | fwnode_handle_put(child); |
a7d878af TP |
224 | goto err; |
225 | } | |
226 | } | |
227 | ||
a314c5c0 | 228 | return priv; |
a7d878af TP |
229 | |
230 | err: | |
a314c5c0 GL |
231 | for (count = priv->num_leds - 2; count >= 0; count--) |
232 | delete_gpio_led(&priv->leds[count]); | |
c6e71f81 | 233 | return ERR_PTR(ret); |
a314c5c0 | 234 | } |
a7d878af | 235 | |
a314c5c0 GL |
236 | static const struct of_device_id of_gpio_leds_match[] = { |
237 | { .compatible = "gpio-leds", }, | |
238 | {}, | |
239 | }; | |
472b854b PP |
240 | |
241 | MODULE_DEVICE_TABLE(of, of_gpio_leds_match); | |
a7d878af | 242 | |
98ea1ea2 | 243 | static int gpio_led_probe(struct platform_device *pdev) |
a314c5c0 | 244 | { |
87aae1ea | 245 | struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev); |
a314c5c0 GL |
246 | struct gpio_leds_priv *priv; |
247 | int i, ret = 0; | |
248 | ||
249 | if (pdata && pdata->num_leds) { | |
198b8611 SK |
250 | priv = devm_kzalloc(&pdev->dev, |
251 | sizeof_gpio_leds_priv(pdata->num_leds), | |
252 | GFP_KERNEL); | |
a314c5c0 GL |
253 | if (!priv) |
254 | return -ENOMEM; | |
255 | ||
256 | priv->num_leds = pdata->num_leds; | |
257 | for (i = 0; i < priv->num_leds; i++) { | |
258 | ret = create_gpio_led(&pdata->leds[i], | |
259 | &priv->leds[i], | |
260 | &pdev->dev, pdata->gpio_blink_set); | |
261 | if (ret < 0) { | |
262 | /* On failure: unwind the led creations */ | |
263 | for (i = i - 1; i >= 0; i--) | |
264 | delete_gpio_led(&priv->leds[i]); | |
a314c5c0 GL |
265 | return ret; |
266 | } | |
267 | } | |
268 | } else { | |
a43f2cbb | 269 | priv = gpio_leds_create(pdev); |
04553e92 RS |
270 | if (IS_ERR(priv)) |
271 | return PTR_ERR(priv); | |
a314c5c0 GL |
272 | } |
273 | ||
274 | platform_set_drvdata(pdev, priv); | |
275 | ||
276 | return 0; | |
a7d878af TP |
277 | } |
278 | ||
678e8a6b | 279 | static int gpio_led_remove(struct platform_device *pdev) |
a7d878af | 280 | { |
59c4dce1 | 281 | struct gpio_leds_priv *priv = platform_get_drvdata(pdev); |
a7d878af TP |
282 | int i; |
283 | ||
a314c5c0 GL |
284 | for (i = 0; i < priv->num_leds; i++) |
285 | delete_gpio_led(&priv->leds[i]); | |
a7d878af | 286 | |
a7d878af TP |
287 | return 0; |
288 | } | |
289 | ||
a314c5c0 GL |
290 | static struct platform_driver gpio_led_driver = { |
291 | .probe = gpio_led_probe, | |
df07cf81 | 292 | .remove = gpio_led_remove, |
a314c5c0 GL |
293 | .driver = { |
294 | .name = "leds-gpio", | |
a43f2cbb | 295 | .of_match_table = of_gpio_leds_match, |
a7d878af | 296 | }, |
a7d878af | 297 | }; |
a314c5c0 | 298 | |
892a8843 | 299 | module_platform_driver(gpio_led_driver); |
a7d878af TP |
300 | |
301 | MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>"); | |
22e03f3b RA |
302 | MODULE_DESCRIPTION("GPIO LED driver"); |
303 | MODULE_LICENSE("GPL"); | |
892a8843 | 304 | MODULE_ALIAS("platform:leds-gpio"); |