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 BH |
30 | u8 blinking; |
31 | int (*platform_gpio_blink_set)(unsigned gpio, 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) { |
5c51277a MW |
41 | int gpio = desc_to_gpio(led_dat->gpiod); |
42 | int level = led_dat->new_level; | |
43 | ||
44 | if (gpiod_is_active_low(led_dat->gpiod)) | |
45 | level = !level; | |
46 | ||
47 | led_dat->platform_gpio_blink_set(gpio, level, NULL, NULL); | |
2146325d BH |
48 | led_dat->blinking = 0; |
49 | } else | |
5c51277a | 50 | gpiod_set_value_cansleep(led_dat->gpiod, led_dat->new_level); |
00852279 | 51 | } |
22e03f3b RA |
52 | |
53 | static void gpio_led_set(struct led_classdev *led_cdev, | |
54 | enum led_brightness value) | |
55 | { | |
56 | struct gpio_led_data *led_dat = | |
57 | container_of(led_cdev, struct gpio_led_data, cdev); | |
58 | int level; | |
59 | ||
60 | if (value == LED_OFF) | |
61 | level = 0; | |
62 | else | |
63 | level = 1; | |
64 | ||
306dd85c DB |
65 | /* Setting GPIOs with I2C/etc requires a task context, and we don't |
66 | * seem to have a reliable way to know if we're already in one; so | |
67 | * let's just assume the worst. | |
68 | */ | |
00852279 | 69 | if (led_dat->can_sleep) { |
306dd85c DB |
70 | led_dat->new_level = level; |
71 | schedule_work(&led_dat->work); | |
2146325d BH |
72 | } else { |
73 | if (led_dat->blinking) { | |
5c51277a MW |
74 | int gpio = desc_to_gpio(led_dat->gpiod); |
75 | ||
76 | if (gpiod_is_active_low(led_dat->gpiod)) | |
77 | level = !level; | |
78 | ||
79 | led_dat->platform_gpio_blink_set(gpio, level, NULL, | |
80 | NULL); | |
2146325d BH |
81 | led_dat->blinking = 0; |
82 | } else | |
5c51277a | 83 | gpiod_set_value(led_dat->gpiod, level); |
2146325d | 84 | } |
22e03f3b RA |
85 | } |
86 | ||
ca3259b3 HVR |
87 | static int gpio_blink_set(struct led_classdev *led_cdev, |
88 | unsigned long *delay_on, unsigned long *delay_off) | |
89 | { | |
90 | struct gpio_led_data *led_dat = | |
91 | container_of(led_cdev, struct gpio_led_data, cdev); | |
5c51277a | 92 | int gpio = desc_to_gpio(led_dat->gpiod); |
ca3259b3 | 93 | |
2146325d | 94 | led_dat->blinking = 1; |
5c51277a | 95 | return led_dat->platform_gpio_blink_set(gpio, GPIO_LED_BLINK, |
2146325d | 96 | delay_on, delay_off); |
ca3259b3 HVR |
97 | } |
98 | ||
98ea1ea2 | 99 | static int create_gpio_led(const struct gpio_led *template, |
a7d878af | 100 | struct gpio_led_data *led_dat, struct device *parent, |
2146325d | 101 | int (*blink_set)(unsigned, int, unsigned long *, unsigned long *)) |
a7d878af | 102 | { |
ed88bae6 | 103 | int ret, state; |
a7d878af | 104 | |
5c51277a MW |
105 | if (!template->gpiod) { |
106 | unsigned long flags = 0; | |
0b4634fc | 107 | |
5c51277a MW |
108 | /* skip leds that aren't available */ |
109 | if (!gpio_is_valid(template->gpio)) { | |
110 | dev_info(parent, "Skipping unavailable LED gpio %d (%s)\n", | |
111 | template->gpio, template->name); | |
112 | return 0; | |
113 | } | |
d379ee8a | 114 | |
5c51277a MW |
115 | if (template->active_low) |
116 | flags |= GPIOF_ACTIVE_LOW; | |
117 | ||
118 | ret = devm_gpio_request_one(parent, template->gpio, flags, | |
119 | template->name); | |
120 | if (ret < 0) | |
121 | return ret; | |
122 | ||
123 | led_dat->gpiod = gpio_to_desc(template->gpio); | |
124 | if (IS_ERR(led_dat->gpiod)) | |
125 | return PTR_ERR(led_dat->gpiod); | |
126 | } | |
803d19d5 | 127 | |
a7d878af TP |
128 | led_dat->cdev.name = template->name; |
129 | led_dat->cdev.default_trigger = template->default_trigger; | |
5c51277a MW |
130 | led_dat->gpiod = template->gpiod; |
131 | led_dat->can_sleep = gpiod_cansleep(template->gpiod); | |
2146325d | 132 | led_dat->blinking = 0; |
a7d878af TP |
133 | if (blink_set) { |
134 | led_dat->platform_gpio_blink_set = blink_set; | |
135 | led_dat->cdev.blink_set = gpio_blink_set; | |
136 | } | |
137 | led_dat->cdev.brightness_set = gpio_led_set; | |
ed88bae6 | 138 | if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) |
5c51277a | 139 | state = !!gpiod_get_value_cansleep(led_dat->gpiod); |
ed88bae6 TP |
140 | else |
141 | state = (template->default_state == LEDS_GPIO_DEFSTATE_ON); | |
142 | led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; | |
defb512d RP |
143 | if (!template->retain_state_suspended) |
144 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; | |
a7d878af | 145 | |
5c51277a | 146 | ret = gpiod_direction_output(led_dat->gpiod, state); |
a7d878af | 147 | if (ret < 0) |
a99d76f9 JH |
148 | return ret; |
149 | ||
a7d878af TP |
150 | INIT_WORK(&led_dat->work, gpio_led_work); |
151 | ||
5c51277a | 152 | return led_classdev_register(parent, &led_dat->cdev); |
a7d878af TP |
153 | } |
154 | ||
155 | static void delete_gpio_led(struct gpio_led_data *led) | |
156 | { | |
157 | led_classdev_unregister(&led->cdev); | |
158 | cancel_work_sync(&led->work); | |
a7d878af TP |
159 | } |
160 | ||
a314c5c0 GL |
161 | struct gpio_leds_priv { |
162 | int num_leds; | |
163 | struct gpio_led_data leds[]; | |
164 | }; | |
22e03f3b | 165 | |
a314c5c0 | 166 | static inline int sizeof_gpio_leds_priv(int num_leds) |
22e03f3b | 167 | { |
a314c5c0 GL |
168 | return sizeof(struct gpio_leds_priv) + |
169 | (sizeof(struct gpio_led_data) * num_leds); | |
22e03f3b RA |
170 | } |
171 | ||
a43f2cbb | 172 | static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev) |
a7d878af | 173 | { |
a43f2cbb RW |
174 | struct device *dev = &pdev->dev; |
175 | struct fwnode_handle *child; | |
a314c5c0 | 176 | struct gpio_leds_priv *priv; |
127aedc8 | 177 | int count, ret; |
a7d878af | 178 | |
a43f2cbb | 179 | count = device_get_child_node_count(dev); |
a7d878af | 180 | if (!count) |
04553e92 RS |
181 | return ERR_PTR(-ENODEV); |
182 | ||
a43f2cbb | 183 | priv = devm_kzalloc(dev, sizeof_gpio_leds_priv(count), GFP_KERNEL); |
a314c5c0 | 184 | if (!priv) |
04553e92 | 185 | return ERR_PTR(-ENOMEM); |
a7d878af | 186 | |
a43f2cbb | 187 | device_for_each_child_node(dev, child) { |
0493a4ff | 188 | struct gpio_led led = {}; |
a43f2cbb RW |
189 | const char *state = NULL; |
190 | ||
191 | led.gpiod = devm_get_gpiod_from_child(dev, child); | |
192 | if (IS_ERR(led.gpiod)) { | |
193 | fwnode_handle_put(child); | |
194 | goto err; | |
195 | } | |
196 | ||
197 | fwnode_property_read_string(child, "label", &led.name); | |
198 | fwnode_property_read_string(child, "linux,default-trigger", | |
199 | &led.default_trigger); | |
200 | ||
201 | if (!fwnode_property_read_string(child, "linux,default_state", | |
202 | &state)) { | |
ed88bae6 TP |
203 | if (!strcmp(state, "keep")) |
204 | led.default_state = LEDS_GPIO_DEFSTATE_KEEP; | |
a314c5c0 | 205 | else if (!strcmp(state, "on")) |
ed88bae6 TP |
206 | led.default_state = LEDS_GPIO_DEFSTATE_ON; |
207 | else | |
208 | led.default_state = LEDS_GPIO_DEFSTATE_OFF; | |
209 | } | |
a7d878af | 210 | |
a43f2cbb | 211 | if (fwnode_property_present(child, "retain-state-suspended")) |
4270a78d RG |
212 | led.retain_state_suspended = 1; |
213 | ||
a314c5c0 | 214 | ret = create_gpio_led(&led, &priv->leds[priv->num_leds++], |
a43f2cbb | 215 | dev, NULL); |
a7d878af | 216 | if (ret < 0) { |
a43f2cbb | 217 | fwnode_handle_put(child); |
a7d878af TP |
218 | goto err; |
219 | } | |
220 | } | |
221 | ||
a314c5c0 | 222 | return priv; |
a7d878af TP |
223 | |
224 | err: | |
a314c5c0 GL |
225 | for (count = priv->num_leds - 2; count >= 0; count--) |
226 | delete_gpio_led(&priv->leds[count]); | |
04553e92 | 227 | return ERR_PTR(-ENODEV); |
a314c5c0 | 228 | } |
a7d878af | 229 | |
a314c5c0 GL |
230 | static const struct of_device_id of_gpio_leds_match[] = { |
231 | { .compatible = "gpio-leds", }, | |
232 | {}, | |
233 | }; | |
472b854b PP |
234 | |
235 | MODULE_DEVICE_TABLE(of, of_gpio_leds_match); | |
a7d878af | 236 | |
98ea1ea2 | 237 | static int gpio_led_probe(struct platform_device *pdev) |
a314c5c0 | 238 | { |
87aae1ea | 239 | struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev); |
a314c5c0 GL |
240 | struct gpio_leds_priv *priv; |
241 | int i, ret = 0; | |
242 | ||
243 | if (pdata && pdata->num_leds) { | |
198b8611 SK |
244 | priv = devm_kzalloc(&pdev->dev, |
245 | sizeof_gpio_leds_priv(pdata->num_leds), | |
246 | GFP_KERNEL); | |
a314c5c0 GL |
247 | if (!priv) |
248 | return -ENOMEM; | |
249 | ||
250 | priv->num_leds = pdata->num_leds; | |
251 | for (i = 0; i < priv->num_leds; i++) { | |
252 | ret = create_gpio_led(&pdata->leds[i], | |
253 | &priv->leds[i], | |
254 | &pdev->dev, pdata->gpio_blink_set); | |
255 | if (ret < 0) { | |
256 | /* On failure: unwind the led creations */ | |
257 | for (i = i - 1; i >= 0; i--) | |
258 | delete_gpio_led(&priv->leds[i]); | |
a314c5c0 GL |
259 | return ret; |
260 | } | |
261 | } | |
262 | } else { | |
a43f2cbb | 263 | priv = gpio_leds_create(pdev); |
04553e92 RS |
264 | if (IS_ERR(priv)) |
265 | return PTR_ERR(priv); | |
a314c5c0 GL |
266 | } |
267 | ||
268 | platform_set_drvdata(pdev, priv); | |
269 | ||
270 | return 0; | |
a7d878af TP |
271 | } |
272 | ||
678e8a6b | 273 | static int gpio_led_remove(struct platform_device *pdev) |
a7d878af | 274 | { |
59c4dce1 | 275 | struct gpio_leds_priv *priv = platform_get_drvdata(pdev); |
a7d878af TP |
276 | int i; |
277 | ||
a314c5c0 GL |
278 | for (i = 0; i < priv->num_leds; i++) |
279 | delete_gpio_led(&priv->leds[i]); | |
a7d878af | 280 | |
a7d878af TP |
281 | return 0; |
282 | } | |
283 | ||
a314c5c0 GL |
284 | static struct platform_driver gpio_led_driver = { |
285 | .probe = gpio_led_probe, | |
df07cf81 | 286 | .remove = gpio_led_remove, |
a314c5c0 GL |
287 | .driver = { |
288 | .name = "leds-gpio", | |
289 | .owner = THIS_MODULE, | |
a43f2cbb | 290 | .of_match_table = of_gpio_leds_match, |
a7d878af | 291 | }, |
a7d878af | 292 | }; |
a314c5c0 | 293 | |
892a8843 | 294 | module_platform_driver(gpio_led_driver); |
a7d878af TP |
295 | |
296 | MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>"); | |
22e03f3b RA |
297 | MODULE_DESCRIPTION("GPIO LED driver"); |
298 | MODULE_LICENSE("GPL"); | |
892a8843 | 299 | MODULE_ALIAS("platform:leds-gpio"); |