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> |
403097f7 | 19 | #include <linux/of.h> |
4cc72346 | 20 | #include <linux/platform_device.h> |
a43f2cbb | 21 | #include <linux/property.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
00852279 | 23 | |
22e03f3b RA |
24 | struct gpio_led_data { |
25 | struct led_classdev cdev; | |
5c51277a | 26 | struct gpio_desc *gpiod; |
00852279 | 27 | u8 can_sleep; |
2146325d | 28 | u8 blinking; |
c673a2b4 | 29 | int (*platform_gpio_blink_set)(struct gpio_desc *desc, int state, |
ca3259b3 | 30 | unsigned long *delay_on, unsigned long *delay_off); |
22e03f3b RA |
31 | }; |
32 | ||
22e03f3b RA |
33 | static void gpio_led_set(struct led_classdev *led_cdev, |
34 | enum led_brightness value) | |
35 | { | |
36 | struct gpio_led_data *led_dat = | |
37 | container_of(led_cdev, struct gpio_led_data, cdev); | |
38 | int level; | |
39 | ||
40 | if (value == LED_OFF) | |
41 | level = 0; | |
42 | else | |
43 | level = 1; | |
44 | ||
d5b8a090 JA |
45 | if (led_dat->blinking) { |
46 | led_dat->platform_gpio_blink_set(led_dat->gpiod, level, | |
47 | NULL, NULL); | |
48 | led_dat->blinking = 0; | |
2146325d | 49 | } else { |
d5b8a090 JA |
50 | if (led_dat->can_sleep) |
51 | gpiod_set_value_cansleep(led_dat->gpiod, level); | |
52 | else | |
5c51277a | 53 | gpiod_set_value(led_dat->gpiod, level); |
2146325d | 54 | } |
22e03f3b RA |
55 | } |
56 | ||
d5b8a090 JA |
57 | static int gpio_led_set_blocking(struct led_classdev *led_cdev, |
58 | enum led_brightness value) | |
59 | { | |
60 | gpio_led_set(led_cdev, value); | |
61 | return 0; | |
62 | } | |
63 | ||
ca3259b3 HVR |
64 | static int gpio_blink_set(struct led_classdev *led_cdev, |
65 | unsigned long *delay_on, unsigned long *delay_off) | |
66 | { | |
67 | struct gpio_led_data *led_dat = | |
68 | container_of(led_cdev, struct gpio_led_data, cdev); | |
69 | ||
2146325d | 70 | led_dat->blinking = 1; |
c673a2b4 | 71 | return led_dat->platform_gpio_blink_set(led_dat->gpiod, GPIO_LED_BLINK, |
2146325d | 72 | delay_on, delay_off); |
ca3259b3 HVR |
73 | } |
74 | ||
98ea1ea2 | 75 | static int create_gpio_led(const struct gpio_led *template, |
a7d878af | 76 | struct gpio_led_data *led_dat, struct device *parent, |
c673a2b4 MW |
77 | int (*blink_set)(struct gpio_desc *, int, unsigned long *, |
78 | unsigned long *)) | |
a7d878af | 79 | { |
ed88bae6 | 80 | int ret, state; |
a7d878af | 81 | |
ec98a497 GU |
82 | led_dat->gpiod = template->gpiod; |
83 | if (!led_dat->gpiod) { | |
c673a2b4 MW |
84 | /* |
85 | * This is the legacy code path for platform code that | |
86 | * still uses GPIO numbers. Ultimately we would like to get | |
87 | * rid of this block completely. | |
88 | */ | |
5c51277a | 89 | unsigned long flags = 0; |
0b4634fc | 90 | |
5c51277a MW |
91 | /* skip leds that aren't available */ |
92 | if (!gpio_is_valid(template->gpio)) { | |
93 | dev_info(parent, "Skipping unavailable LED gpio %d (%s)\n", | |
94 | template->gpio, template->name); | |
95 | return 0; | |
96 | } | |
d379ee8a | 97 | |
5c51277a MW |
98 | if (template->active_low) |
99 | flags |= GPIOF_ACTIVE_LOW; | |
100 | ||
101 | ret = devm_gpio_request_one(parent, template->gpio, flags, | |
102 | template->name); | |
103 | if (ret < 0) | |
104 | return ret; | |
105 | ||
106 | led_dat->gpiod = gpio_to_desc(template->gpio); | |
107 | if (IS_ERR(led_dat->gpiod)) | |
108 | return PTR_ERR(led_dat->gpiod); | |
109 | } | |
803d19d5 | 110 | |
a7d878af TP |
111 | led_dat->cdev.name = template->name; |
112 | led_dat->cdev.default_trigger = template->default_trigger; | |
ec98a497 | 113 | led_dat->can_sleep = gpiod_cansleep(led_dat->gpiod); |
d5b8a090 JA |
114 | if (!led_dat->can_sleep) |
115 | led_dat->cdev.brightness_set = gpio_led_set; | |
116 | else | |
117 | led_dat->cdev.brightness_set_blocking = gpio_led_set_blocking; | |
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 | } | |
ed88bae6 | 123 | if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) |
5c51277a | 124 | state = !!gpiod_get_value_cansleep(led_dat->gpiod); |
ed88bae6 TP |
125 | else |
126 | state = (template->default_state == LEDS_GPIO_DEFSTATE_ON); | |
127 | led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; | |
defb512d RP |
128 | if (!template->retain_state_suspended) |
129 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; | |
a7d878af | 130 | |
5c51277a | 131 | ret = gpiod_direction_output(led_dat->gpiod, state); |
a7d878af | 132 | if (ret < 0) |
a99d76f9 JH |
133 | return ret; |
134 | ||
5c51277a | 135 | return led_classdev_register(parent, &led_dat->cdev); |
a7d878af TP |
136 | } |
137 | ||
a314c5c0 GL |
138 | struct gpio_leds_priv { |
139 | int num_leds; | |
140 | struct gpio_led_data leds[]; | |
141 | }; | |
22e03f3b | 142 | |
a314c5c0 | 143 | static inline int sizeof_gpio_leds_priv(int num_leds) |
22e03f3b | 144 | { |
a314c5c0 GL |
145 | return sizeof(struct gpio_leds_priv) + |
146 | (sizeof(struct gpio_led_data) * num_leds); | |
22e03f3b RA |
147 | } |
148 | ||
a43f2cbb | 149 | static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev) |
a7d878af | 150 | { |
a43f2cbb RW |
151 | struct device *dev = &pdev->dev; |
152 | struct fwnode_handle *child; | |
a314c5c0 | 153 | struct gpio_leds_priv *priv; |
127aedc8 | 154 | int count, ret; |
29470ea8 | 155 | struct device_node *np; |
a7d878af | 156 | |
a43f2cbb | 157 | count = device_get_child_node_count(dev); |
a7d878af | 158 | if (!count) |
04553e92 RS |
159 | return ERR_PTR(-ENODEV); |
160 | ||
a43f2cbb | 161 | priv = devm_kzalloc(dev, sizeof_gpio_leds_priv(count), GFP_KERNEL); |
a314c5c0 | 162 | if (!priv) |
04553e92 | 163 | return ERR_PTR(-ENOMEM); |
a7d878af | 164 | |
a43f2cbb | 165 | device_for_each_child_node(dev, child) { |
0493a4ff | 166 | struct gpio_led led = {}; |
a43f2cbb RW |
167 | const char *state = NULL; |
168 | ||
1feb57a2 | 169 | led.gpiod = devm_get_gpiod_from_child(dev, NULL, child); |
a43f2cbb RW |
170 | if (IS_ERR(led.gpiod)) { |
171 | fwnode_handle_put(child); | |
c6e71f81 | 172 | ret = PTR_ERR(led.gpiod); |
a43f2cbb RW |
173 | goto err; |
174 | } | |
175 | ||
c181fb3e | 176 | np = to_of_node(child); |
29470ea8 FE |
177 | |
178 | if (fwnode_property_present(child, "label")) { | |
179 | fwnode_property_read_string(child, "label", &led.name); | |
180 | } else { | |
181 | if (IS_ENABLED(CONFIG_OF) && !led.name && np) | |
182 | led.name = np->name; | |
0e14e0bf JA |
183 | if (!led.name) { |
184 | ret = -EINVAL; | |
185 | goto err; | |
186 | } | |
29470ea8 | 187 | } |
a43f2cbb RW |
188 | fwnode_property_read_string(child, "linux,default-trigger", |
189 | &led.default_trigger); | |
190 | ||
d735d25e | 191 | if (!fwnode_property_read_string(child, "default-state", |
a43f2cbb | 192 | &state)) { |
ed88bae6 TP |
193 | if (!strcmp(state, "keep")) |
194 | led.default_state = LEDS_GPIO_DEFSTATE_KEEP; | |
a314c5c0 | 195 | else if (!strcmp(state, "on")) |
ed88bae6 TP |
196 | led.default_state = LEDS_GPIO_DEFSTATE_ON; |
197 | else | |
198 | led.default_state = LEDS_GPIO_DEFSTATE_OFF; | |
199 | } | |
a7d878af | 200 | |
a43f2cbb | 201 | if (fwnode_property_present(child, "retain-state-suspended")) |
4270a78d RG |
202 | led.retain_state_suspended = 1; |
203 | ||
65c6b7e3 | 204 | ret = create_gpio_led(&led, &priv->leds[priv->num_leds], |
a43f2cbb | 205 | dev, NULL); |
a7d878af | 206 | if (ret < 0) { |
a43f2cbb | 207 | fwnode_handle_put(child); |
a7d878af TP |
208 | goto err; |
209 | } | |
65c6b7e3 | 210 | priv->num_leds++; |
a7d878af TP |
211 | } |
212 | ||
a314c5c0 | 213 | return priv; |
a7d878af TP |
214 | |
215 | err: | |
65c6b7e3 | 216 | for (count = priv->num_leds - 1; count >= 0; count--) |
d5b8a090 | 217 | led_classdev_unregister(&priv->leds[count].cdev); |
c6e71f81 | 218 | return ERR_PTR(ret); |
a314c5c0 | 219 | } |
a7d878af | 220 | |
a314c5c0 GL |
221 | static const struct of_device_id of_gpio_leds_match[] = { |
222 | { .compatible = "gpio-leds", }, | |
223 | {}, | |
224 | }; | |
472b854b PP |
225 | |
226 | MODULE_DEVICE_TABLE(of, of_gpio_leds_match); | |
a7d878af | 227 | |
98ea1ea2 | 228 | static int gpio_led_probe(struct platform_device *pdev) |
a314c5c0 | 229 | { |
87aae1ea | 230 | struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev); |
a314c5c0 GL |
231 | struct gpio_leds_priv *priv; |
232 | int i, ret = 0; | |
233 | ||
234 | if (pdata && pdata->num_leds) { | |
198b8611 SK |
235 | priv = devm_kzalloc(&pdev->dev, |
236 | sizeof_gpio_leds_priv(pdata->num_leds), | |
237 | GFP_KERNEL); | |
a314c5c0 GL |
238 | if (!priv) |
239 | return -ENOMEM; | |
240 | ||
241 | priv->num_leds = pdata->num_leds; | |
242 | for (i = 0; i < priv->num_leds; i++) { | |
243 | ret = create_gpio_led(&pdata->leds[i], | |
244 | &priv->leds[i], | |
245 | &pdev->dev, pdata->gpio_blink_set); | |
246 | if (ret < 0) { | |
247 | /* On failure: unwind the led creations */ | |
248 | for (i = i - 1; i >= 0; i--) | |
d5b8a090 JA |
249 | led_classdev_unregister( |
250 | &priv->leds[i].cdev); | |
a314c5c0 GL |
251 | return ret; |
252 | } | |
253 | } | |
254 | } else { | |
a43f2cbb | 255 | priv = gpio_leds_create(pdev); |
04553e92 RS |
256 | if (IS_ERR(priv)) |
257 | return PTR_ERR(priv); | |
a314c5c0 GL |
258 | } |
259 | ||
260 | platform_set_drvdata(pdev, priv); | |
261 | ||
262 | return 0; | |
a7d878af TP |
263 | } |
264 | ||
678e8a6b | 265 | static int gpio_led_remove(struct platform_device *pdev) |
a7d878af | 266 | { |
59c4dce1 | 267 | struct gpio_leds_priv *priv = platform_get_drvdata(pdev); |
a7d878af TP |
268 | int i; |
269 | ||
a314c5c0 | 270 | for (i = 0; i < priv->num_leds; i++) |
d5b8a090 | 271 | led_classdev_unregister(&priv->leds[i].cdev); |
a7d878af | 272 | |
a7d878af TP |
273 | return 0; |
274 | } | |
275 | ||
707f33ed HS |
276 | static void gpio_led_shutdown(struct platform_device *pdev) |
277 | { | |
278 | struct gpio_leds_priv *priv = platform_get_drvdata(pdev); | |
279 | int i; | |
280 | ||
281 | for (i = 0; i < priv->num_leds; i++) { | |
282 | struct gpio_led_data *led = &priv->leds[i]; | |
283 | ||
284 | gpio_led_set(&led->cdev, LED_OFF); | |
285 | } | |
286 | } | |
287 | ||
a314c5c0 GL |
288 | static struct platform_driver gpio_led_driver = { |
289 | .probe = gpio_led_probe, | |
df07cf81 | 290 | .remove = gpio_led_remove, |
707f33ed | 291 | .shutdown = gpio_led_shutdown, |
a314c5c0 GL |
292 | .driver = { |
293 | .name = "leds-gpio", | |
a43f2cbb | 294 | .of_match_table = 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"); |