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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 | */ | |
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; |
68620e59 | 29 | gpio_blink_set_t platform_gpio_blink_set; |
22e03f3b RA |
30 | }; |
31 | ||
45808094 HK |
32 | static inline struct gpio_led_data * |
33 | cdev_to_gpio_led_data(struct led_classdev *led_cdev) | |
34 | { | |
35 | return container_of(led_cdev, struct gpio_led_data, cdev); | |
36 | } | |
37 | ||
22e03f3b RA |
38 | static void gpio_led_set(struct led_classdev *led_cdev, |
39 | enum led_brightness value) | |
40 | { | |
45808094 | 41 | struct gpio_led_data *led_dat = cdev_to_gpio_led_data(led_cdev); |
22e03f3b RA |
42 | int level; |
43 | ||
44 | if (value == LED_OFF) | |
45 | level = 0; | |
46 | else | |
47 | level = 1; | |
48 | ||
d5b8a090 JA |
49 | if (led_dat->blinking) { |
50 | led_dat->platform_gpio_blink_set(led_dat->gpiod, level, | |
51 | NULL, NULL); | |
52 | led_dat->blinking = 0; | |
5bf30872 PE |
53 | } else if (led_dat->cdev.flags & SET_GPIO_INPUT) { |
54 | gpiod_direction_input(led_dat->gpiod); | |
55 | led_dat->cdev.flags &= ~SET_GPIO_INPUT; | |
56 | } else if (led_dat->cdev.flags & SET_GPIO_OUTPUT) { | |
57 | gpiod_direction_output(led_dat->gpiod, level); | |
58 | led_dat->cdev.flags &= ~SET_GPIO_OUTPUT; | |
2146325d | 59 | } else { |
5bf30872 PE |
60 | if (led_dat->can_sleep || |
61 | (led_dat->cdev.flags & (SET_GPIO_INPUT | SET_GPIO_OUTPUT) )) | |
d5b8a090 JA |
62 | gpiod_set_value_cansleep(led_dat->gpiod, level); |
63 | else | |
5c51277a | 64 | gpiod_set_value(led_dat->gpiod, level); |
2146325d | 65 | } |
22e03f3b RA |
66 | } |
67 | ||
d5b8a090 JA |
68 | static int gpio_led_set_blocking(struct led_classdev *led_cdev, |
69 | enum led_brightness value) | |
70 | { | |
71 | gpio_led_set(led_cdev, value); | |
72 | return 0; | |
73 | } | |
74 | ||
5bf30872 PE |
75 | static enum led_brightness gpio_led_get(struct led_classdev *led_cdev) |
76 | { | |
77 | struct gpio_led_data *led_dat = | |
78 | container_of(led_cdev, struct gpio_led_data, cdev); | |
79 | return gpiod_get_value_cansleep(led_dat->gpiod) ? LED_FULL : LED_OFF; | |
80 | } | |
81 | ||
ca3259b3 HVR |
82 | static int gpio_blink_set(struct led_classdev *led_cdev, |
83 | unsigned long *delay_on, unsigned long *delay_off) | |
84 | { | |
45808094 | 85 | struct gpio_led_data *led_dat = cdev_to_gpio_led_data(led_cdev); |
ca3259b3 | 86 | |
2146325d | 87 | led_dat->blinking = 1; |
c673a2b4 | 88 | return led_dat->platform_gpio_blink_set(led_dat->gpiod, GPIO_LED_BLINK, |
2146325d | 89 | delay_on, delay_off); |
ca3259b3 HVR |
90 | } |
91 | ||
98ea1ea2 | 92 | static int create_gpio_led(const struct gpio_led *template, |
a7d878af | 93 | struct gpio_led_data *led_dat, struct device *parent, |
68620e59 | 94 | gpio_blink_set_t blink_set) |
a7d878af | 95 | { |
ed88bae6 | 96 | int ret, state; |
a7d878af | 97 | |
ec98a497 GU |
98 | led_dat->gpiod = template->gpiod; |
99 | if (!led_dat->gpiod) { | |
c673a2b4 MW |
100 | /* |
101 | * This is the legacy code path for platform code that | |
102 | * still uses GPIO numbers. Ultimately we would like to get | |
103 | * rid of this block completely. | |
104 | */ | |
eae7c98a | 105 | unsigned long flags = GPIOF_OUT_INIT_LOW; |
0b4634fc | 106 | |
5c51277a MW |
107 | /* skip leds that aren't available */ |
108 | if (!gpio_is_valid(template->gpio)) { | |
109 | dev_info(parent, "Skipping unavailable LED gpio %d (%s)\n", | |
110 | template->gpio, template->name); | |
111 | return 0; | |
112 | } | |
d379ee8a | 113 | |
5c51277a MW |
114 | if (template->active_low) |
115 | flags |= GPIOF_ACTIVE_LOW; | |
116 | ||
117 | ret = devm_gpio_request_one(parent, template->gpio, flags, | |
118 | template->name); | |
119 | if (ret < 0) | |
120 | return ret; | |
121 | ||
122 | led_dat->gpiod = gpio_to_desc(template->gpio); | |
2d88a331 WY |
123 | if (!led_dat->gpiod) |
124 | return -EINVAL; | |
5c51277a | 125 | } |
803d19d5 | 126 | |
a7d878af TP |
127 | led_dat->cdev.name = template->name; |
128 | led_dat->cdev.default_trigger = template->default_trigger; | |
ec98a497 | 129 | led_dat->can_sleep = gpiod_cansleep(led_dat->gpiod); |
d5b8a090 JA |
130 | if (!led_dat->can_sleep) |
131 | led_dat->cdev.brightness_set = gpio_led_set; | |
132 | else | |
133 | led_dat->cdev.brightness_set_blocking = gpio_led_set_blocking; | |
2146325d | 134 | led_dat->blinking = 0; |
a7d878af TP |
135 | if (blink_set) { |
136 | led_dat->platform_gpio_blink_set = blink_set; | |
137 | led_dat->cdev.blink_set = gpio_blink_set; | |
138 | } | |
5bf30872 | 139 | led_dat->cdev.brightness_get = gpio_led_get; |
061b5c1d HK |
140 | if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) { |
141 | state = gpiod_get_value_cansleep(led_dat->gpiod); | |
142 | if (state < 0) | |
143 | return state; | |
144 | } else { | |
ed88bae6 | 145 | state = (template->default_state == LEDS_GPIO_DEFSTATE_ON); |
061b5c1d | 146 | } |
ed88bae6 | 147 | led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; |
defb512d RP |
148 | if (!template->retain_state_suspended) |
149 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; | |
80d6737b EG |
150 | if (template->panic_indicator) |
151 | led_dat->cdev.flags |= LED_PANIC_INDICATOR; | |
a7d878af | 152 | |
5c51277a | 153 | ret = gpiod_direction_output(led_dat->gpiod, state); |
a7d878af | 154 | if (ret < 0) |
a99d76f9 JH |
155 | return ret; |
156 | ||
bc2c0dd8 | 157 | return devm_led_classdev_register(parent, &led_dat->cdev); |
a7d878af TP |
158 | } |
159 | ||
a314c5c0 GL |
160 | struct gpio_leds_priv { |
161 | int num_leds; | |
162 | struct gpio_led_data leds[]; | |
163 | }; | |
22e03f3b | 164 | |
a314c5c0 | 165 | static inline int sizeof_gpio_leds_priv(int num_leds) |
22e03f3b | 166 | { |
a314c5c0 GL |
167 | return sizeof(struct gpio_leds_priv) + |
168 | (sizeof(struct gpio_led_data) * num_leds); | |
22e03f3b RA |
169 | } |
170 | ||
a43f2cbb | 171 | static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev) |
a7d878af | 172 | { |
a43f2cbb RW |
173 | struct device *dev = &pdev->dev; |
174 | struct fwnode_handle *child; | |
a314c5c0 | 175 | struct gpio_leds_priv *priv; |
127aedc8 | 176 | int count, ret; |
a7d878af | 177 | |
a43f2cbb | 178 | count = device_get_child_node_count(dev); |
a7d878af | 179 | if (!count) |
04553e92 RS |
180 | return ERR_PTR(-ENODEV); |
181 | ||
a43f2cbb | 182 | priv = devm_kzalloc(dev, sizeof_gpio_leds_priv(count), GFP_KERNEL); |
a314c5c0 | 183 | if (!priv) |
04553e92 | 184 | return ERR_PTR(-ENOMEM); |
a7d878af | 185 | |
a43f2cbb | 186 | device_for_each_child_node(dev, child) { |
bff23714 | 187 | struct gpio_led_data *led_dat = &priv->leds[priv->num_leds]; |
0493a4ff | 188 | struct gpio_led led = {}; |
a43f2cbb | 189 | const char *state = NULL; |
8ca03da5 | 190 | struct device_node *np = to_of_node(child); |
a43f2cbb | 191 | |
1feb57a2 | 192 | led.gpiod = devm_get_gpiod_from_child(dev, NULL, child); |
a43f2cbb RW |
193 | if (IS_ERR(led.gpiod)) { |
194 | fwnode_handle_put(child); | |
74b69e52 | 195 | return ERR_CAST(led.gpiod); |
a43f2cbb RW |
196 | } |
197 | ||
bec69de8 HK |
198 | ret = fwnode_property_read_string(child, "label", &led.name); |
199 | if (ret && IS_ENABLED(CONFIG_OF) && np) | |
200 | led.name = np->name; | |
201 | if (!led.name) { | |
74b69e52 HK |
202 | fwnode_handle_put(child); |
203 | return ERR_PTR(-EINVAL); | |
29470ea8 | 204 | } |
bec69de8 | 205 | |
a43f2cbb RW |
206 | fwnode_property_read_string(child, "linux,default-trigger", |
207 | &led.default_trigger); | |
208 | ||
d735d25e | 209 | if (!fwnode_property_read_string(child, "default-state", |
a43f2cbb | 210 | &state)) { |
ed88bae6 TP |
211 | if (!strcmp(state, "keep")) |
212 | led.default_state = LEDS_GPIO_DEFSTATE_KEEP; | |
a314c5c0 | 213 | else if (!strcmp(state, "on")) |
ed88bae6 TP |
214 | led.default_state = LEDS_GPIO_DEFSTATE_ON; |
215 | else | |
216 | led.default_state = LEDS_GPIO_DEFSTATE_OFF; | |
217 | } | |
a7d878af | 218 | |
a43f2cbb | 219 | if (fwnode_property_present(child, "retain-state-suspended")) |
4270a78d | 220 | led.retain_state_suspended = 1; |
80d6737b EG |
221 | if (fwnode_property_present(child, "panic-indicator")) |
222 | led.panic_indicator = 1; | |
4270a78d | 223 | |
bff23714 | 224 | ret = create_gpio_led(&led, led_dat, dev, NULL); |
a7d878af | 225 | if (ret < 0) { |
a43f2cbb | 226 | fwnode_handle_put(child); |
74b69e52 | 227 | return ERR_PTR(ret); |
a7d878af | 228 | } |
bff23714 | 229 | led_dat->cdev.dev->of_node = np; |
65c6b7e3 | 230 | priv->num_leds++; |
a7d878af TP |
231 | } |
232 | ||
a314c5c0 | 233 | return priv; |
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); | |
bc2c0dd8 | 261 | if (ret < 0) |
a314c5c0 | 262 | return ret; |
a314c5c0 GL |
263 | } |
264 | } else { | |
a43f2cbb | 265 | priv = gpio_leds_create(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 | ||
707f33ed HS |
275 | static void gpio_led_shutdown(struct platform_device *pdev) |
276 | { | |
277 | struct gpio_leds_priv *priv = platform_get_drvdata(pdev); | |
278 | int i; | |
279 | ||
280 | for (i = 0; i < priv->num_leds; i++) { | |
281 | struct gpio_led_data *led = &priv->leds[i]; | |
282 | ||
283 | gpio_led_set(&led->cdev, LED_OFF); | |
284 | } | |
285 | } | |
286 | ||
a314c5c0 GL |
287 | static struct platform_driver gpio_led_driver = { |
288 | .probe = gpio_led_probe, | |
707f33ed | 289 | .shutdown = gpio_led_shutdown, |
a314c5c0 GL |
290 | .driver = { |
291 | .name = "leds-gpio", | |
a43f2cbb | 292 | .of_match_table = of_gpio_leds_match, |
a7d878af | 293 | }, |
a7d878af | 294 | }; |
a314c5c0 | 295 | |
892a8843 | 296 | module_platform_driver(gpio_led_driver); |
a7d878af TP |
297 | |
298 | MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>"); | |
22e03f3b RA |
299 | MODULE_DESCRIPTION("GPIO LED driver"); |
300 | MODULE_LICENSE("GPL"); | |
892a8843 | 301 | MODULE_ALIAS("platform:leds-gpio"); |