Commit | Line | Data |
---|---|---|
0e7d0c86 GJ |
1 | /* |
2 | * Driver for buttons on GPIO lines not capable of generating interrupts | |
3 | * | |
4 | * Copyright (C) 2007-2010 Gabor Juhos <juhosg@openwrt.org> | |
5 | * Copyright (C) 2010 Nuno Goncalves <nunojpg@gmail.com> | |
6 | * | |
7 | * This file was based on: /drivers/input/misc/cobalt_btns.c | |
8 | * Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> | |
9 | * | |
10 | * also was based on: /drivers/input/keyboard/gpio_keys.c | |
11 | * Copyright 2005 Phil Blundell | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License version 2 as | |
15 | * published by the Free Software Foundation. | |
16 | */ | |
17 | ||
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
0e7d0c86 GJ |
20 | #include <linux/slab.h> |
21 | #include <linux/input.h> | |
22 | #include <linux/input-polldev.h> | |
23 | #include <linux/ioport.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/gpio.h> | |
633a21d8 | 26 | #include <linux/gpio/consumer.h> |
0e7d0c86 | 27 | #include <linux/gpio_keys.h> |
b26d4e22 | 28 | #include <linux/property.h> |
0e7d0c86 GJ |
29 | |
30 | #define DRV_NAME "gpio-keys-polled" | |
31 | ||
32 | struct gpio_keys_button_data { | |
33 | int last_state; | |
34 | int count; | |
35 | int threshold; | |
36 | int can_sleep; | |
37 | }; | |
38 | ||
39 | struct gpio_keys_polled_dev { | |
40 | struct input_polled_dev *poll_dev; | |
41 | struct device *dev; | |
2976f247 | 42 | const struct gpio_keys_platform_data *pdata; |
6f29d3b2 HG |
43 | unsigned long rel_axis_seen[BITS_TO_LONGS(REL_CNT)]; |
44 | unsigned long abs_axis_seen[BITS_TO_LONGS(ABS_CNT)]; | |
0e7d0c86 GJ |
45 | struct gpio_keys_button_data data[0]; |
46 | }; | |
47 | ||
6f29d3b2 HG |
48 | static void gpio_keys_button_event(struct input_polled_dev *dev, |
49 | struct gpio_keys_button *button, | |
50 | int state) | |
51 | { | |
52 | struct gpio_keys_polled_dev *bdev = dev->private; | |
53 | struct input_dev *input = dev->input; | |
54 | unsigned int type = button->type ?: EV_KEY; | |
55 | ||
56 | if (type == EV_REL) { | |
57 | if (state) { | |
58 | input_event(input, type, button->code, button->value); | |
59 | __set_bit(button->code, bdev->rel_axis_seen); | |
60 | } | |
61 | } else if (type == EV_ABS) { | |
62 | if (state) { | |
63 | input_event(input, type, button->code, button->value); | |
64 | __set_bit(button->code, bdev->abs_axis_seen); | |
65 | } | |
66 | } else { | |
67 | input_event(input, type, button->code, state); | |
68 | input_sync(input); | |
69 | } | |
70 | } | |
71 | ||
72 | static void gpio_keys_polled_check_state(struct input_polled_dev *dev, | |
0e7d0c86 GJ |
73 | struct gpio_keys_button *button, |
74 | struct gpio_keys_button_data *bdata) | |
75 | { | |
76 | int state; | |
77 | ||
78 | if (bdata->can_sleep) | |
633a21d8 | 79 | state = !!gpiod_get_value_cansleep(button->gpiod); |
0e7d0c86 | 80 | else |
633a21d8 | 81 | state = !!gpiod_get_value(button->gpiod); |
0e7d0c86 | 82 | |
6f29d3b2 | 83 | gpio_keys_button_event(dev, button, state); |
0e7d0c86 | 84 | |
6f29d3b2 | 85 | if (state != bdata->last_state) { |
0e7d0c86 GJ |
86 | bdata->count = 0; |
87 | bdata->last_state = state; | |
88 | } | |
89 | } | |
90 | ||
91 | static void gpio_keys_polled_poll(struct input_polled_dev *dev) | |
92 | { | |
93 | struct gpio_keys_polled_dev *bdev = dev->private; | |
2976f247 | 94 | const struct gpio_keys_platform_data *pdata = bdev->pdata; |
0e7d0c86 GJ |
95 | struct input_dev *input = dev->input; |
96 | int i; | |
97 | ||
6f29d3b2 HG |
98 | memset(bdev->rel_axis_seen, 0, sizeof(bdev->rel_axis_seen)); |
99 | memset(bdev->abs_axis_seen, 0, sizeof(bdev->abs_axis_seen)); | |
100 | ||
2976f247 | 101 | for (i = 0; i < pdata->nbuttons; i++) { |
0e7d0c86 GJ |
102 | struct gpio_keys_button_data *bdata = &bdev->data[i]; |
103 | ||
6f29d3b2 | 104 | if (bdata->count < bdata->threshold) { |
0e7d0c86 | 105 | bdata->count++; |
6f29d3b2 HG |
106 | gpio_keys_button_event(dev, &pdata->buttons[i], |
107 | bdata->last_state); | |
108 | } else { | |
109 | gpio_keys_polled_check_state(dev, &pdata->buttons[i], | |
0e7d0c86 | 110 | bdata); |
6f29d3b2 HG |
111 | } |
112 | } | |
113 | ||
114 | for_each_set_bit(i, input->relbit, REL_CNT) { | |
115 | if (!test_bit(i, bdev->rel_axis_seen)) | |
116 | input_event(input, EV_REL, i, 0); | |
117 | } | |
118 | ||
119 | for_each_set_bit(i, input->absbit, ABS_CNT) { | |
120 | if (!test_bit(i, bdev->abs_axis_seen)) | |
121 | input_event(input, EV_ABS, i, 0); | |
0e7d0c86 | 122 | } |
6f29d3b2 HG |
123 | |
124 | input_sync(input); | |
0e7d0c86 GJ |
125 | } |
126 | ||
127 | static void gpio_keys_polled_open(struct input_polled_dev *dev) | |
128 | { | |
129 | struct gpio_keys_polled_dev *bdev = dev->private; | |
2976f247 | 130 | const struct gpio_keys_platform_data *pdata = bdev->pdata; |
0e7d0c86 GJ |
131 | |
132 | if (pdata->enable) | |
133 | pdata->enable(bdev->dev); | |
134 | } | |
135 | ||
136 | static void gpio_keys_polled_close(struct input_polled_dev *dev) | |
137 | { | |
138 | struct gpio_keys_polled_dev *bdev = dev->private; | |
2976f247 | 139 | const struct gpio_keys_platform_data *pdata = bdev->pdata; |
0e7d0c86 GJ |
140 | |
141 | if (pdata->disable) | |
142 | pdata->disable(bdev->dev); | |
143 | } | |
144 | ||
5298cc4c | 145 | static struct gpio_keys_platform_data *gpio_keys_polled_get_devtree_pdata(struct device *dev) |
a2f25245 | 146 | { |
a2f25245 APS |
147 | struct gpio_keys_platform_data *pdata; |
148 | struct gpio_keys_button *button; | |
b26d4e22 | 149 | struct fwnode_handle *child; |
a2f25245 APS |
150 | int error; |
151 | int nbuttons; | |
a2f25245 | 152 | |
b26d4e22 | 153 | nbuttons = device_get_child_node_count(dev); |
a2f25245 APS |
154 | if (nbuttons == 0) |
155 | return NULL; | |
156 | ||
68252638 AS |
157 | pdata = devm_kzalloc(dev, sizeof(*pdata) + nbuttons * sizeof(*button), |
158 | GFP_KERNEL); | |
159 | if (!pdata) | |
160 | return ERR_PTR(-ENOMEM); | |
a2f25245 APS |
161 | |
162 | pdata->buttons = (struct gpio_keys_button *)(pdata + 1); | |
163 | ||
b26d4e22 AL |
164 | pdata->rep = device_property_present(dev, "autorepeat"); |
165 | device_property_read_u32(dev, "poll-interval", &pdata->poll_interval); | |
a2f25245 | 166 | |
b26d4e22 AL |
167 | device_for_each_child_node(dev, child) { |
168 | struct gpio_desc *desc; | |
a2f25245 | 169 | |
1feb57a2 | 170 | desc = devm_get_gpiod_from_child(dev, NULL, child); |
b26d4e22 AL |
171 | if (IS_ERR(desc)) { |
172 | error = PTR_ERR(desc); | |
d46329a7 GJ |
173 | if (error != -EPROBE_DEFER) |
174 | dev_err(dev, | |
175 | "Failed to get gpio flags, error: %d\n", | |
176 | error); | |
b26d4e22 | 177 | fwnode_handle_put(child); |
68252638 | 178 | return ERR_PTR(error); |
d46329a7 GJ |
179 | } |
180 | ||
b26d4e22 AL |
181 | button = &pdata->buttons[pdata->nbuttons++]; |
182 | button->gpiod = desc; | |
a2f25245 | 183 | |
b26d4e22 AL |
184 | if (fwnode_property_read_u32(child, "linux,code", &button->code)) { |
185 | dev_err(dev, "Button without keycode: %d\n", | |
186 | pdata->nbuttons - 1); | |
187 | fwnode_handle_put(child); | |
68252638 | 188 | return ERR_PTR(-EINVAL); |
a2f25245 APS |
189 | } |
190 | ||
b26d4e22 | 191 | fwnode_property_read_string(child, "label", &button->desc); |
a2f25245 | 192 | |
b26d4e22 AL |
193 | if (fwnode_property_read_u32(child, "linux,input-type", |
194 | &button->type)) | |
a2f25245 APS |
195 | button->type = EV_KEY; |
196 | ||
6f29d3b2 HG |
197 | if (fwnode_property_read_u32(child, "linux,input-value", |
198 | (u32 *)&button->value)) | |
199 | button->value = 1; | |
200 | ||
99b4ffbd DT |
201 | button->wakeup = |
202 | fwnode_property_read_bool(child, "wakeup-source") || | |
203 | /* legacy name */ | |
204 | fwnode_property_read_bool(child, "gpio-key,wakeup"); | |
a2f25245 | 205 | |
b26d4e22 AL |
206 | if (fwnode_property_read_u32(child, "debounce-interval", |
207 | &button->debounce_interval)) | |
a2f25245 APS |
208 | button->debounce_interval = 5; |
209 | } | |
210 | ||
68252638 AS |
211 | if (pdata->nbuttons == 0) |
212 | return ERR_PTR(-EINVAL); | |
a2f25245 APS |
213 | |
214 | return pdata; | |
a2f25245 APS |
215 | } |
216 | ||
6f29d3b2 HG |
217 | static void gpio_keys_polled_set_abs_params(struct input_dev *input, |
218 | const struct gpio_keys_platform_data *pdata, unsigned int code) | |
219 | { | |
220 | int i, min = 0, max = 0; | |
221 | ||
222 | for (i = 0; i < pdata->nbuttons; i++) { | |
223 | struct gpio_keys_button *button = &pdata->buttons[i]; | |
224 | ||
225 | if (button->type != EV_ABS || button->code != code) | |
226 | continue; | |
227 | ||
228 | if (button->value < min) | |
229 | min = button->value; | |
230 | if (button->value > max) | |
231 | max = button->value; | |
232 | } | |
233 | input_set_abs_params(input, code, min, max, 0, 0); | |
234 | } | |
235 | ||
90c98ef5 | 236 | static const struct of_device_id gpio_keys_polled_of_match[] = { |
a2f25245 APS |
237 | { .compatible = "gpio-keys-polled", }, |
238 | { }, | |
239 | }; | |
240 | MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match); | |
241 | ||
5298cc4c | 242 | static int gpio_keys_polled_probe(struct platform_device *pdev) |
0e7d0c86 | 243 | { |
0e7d0c86 | 244 | struct device *dev = &pdev->dev; |
2976f247 | 245 | const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev); |
0e7d0c86 GJ |
246 | struct gpio_keys_polled_dev *bdev; |
247 | struct input_polled_dev *poll_dev; | |
248 | struct input_dev *input; | |
68252638 | 249 | size_t size; |
0e7d0c86 GJ |
250 | int error; |
251 | int i; | |
252 | ||
a2f25245 APS |
253 | if (!pdata) { |
254 | pdata = gpio_keys_polled_get_devtree_pdata(dev); | |
255 | if (IS_ERR(pdata)) | |
256 | return PTR_ERR(pdata); | |
257 | if (!pdata) { | |
258 | dev_err(dev, "missing platform data\n"); | |
259 | return -EINVAL; | |
260 | } | |
261 | } | |
262 | ||
263 | if (!pdata->poll_interval) { | |
264 | dev_err(dev, "missing poll_interval value\n"); | |
68252638 | 265 | return -EINVAL; |
a2f25245 | 266 | } |
0e7d0c86 | 267 | |
68252638 AS |
268 | size = sizeof(struct gpio_keys_polled_dev) + |
269 | pdata->nbuttons * sizeof(struct gpio_keys_button_data); | |
270 | bdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL); | |
0e7d0c86 GJ |
271 | if (!bdev) { |
272 | dev_err(dev, "no memory for private data\n"); | |
68252638 | 273 | return -ENOMEM; |
0e7d0c86 GJ |
274 | } |
275 | ||
68252638 | 276 | poll_dev = devm_input_allocate_polled_device(&pdev->dev); |
0e7d0c86 GJ |
277 | if (!poll_dev) { |
278 | dev_err(dev, "no memory for polled device\n"); | |
68252638 | 279 | return -ENOMEM; |
0e7d0c86 GJ |
280 | } |
281 | ||
282 | poll_dev->private = bdev; | |
283 | poll_dev->poll = gpio_keys_polled_poll; | |
284 | poll_dev->poll_interval = pdata->poll_interval; | |
285 | poll_dev->open = gpio_keys_polled_open; | |
286 | poll_dev->close = gpio_keys_polled_close; | |
287 | ||
288 | input = poll_dev->input; | |
289 | ||
0e7d0c86 GJ |
290 | input->name = pdev->name; |
291 | input->phys = DRV_NAME"/input0"; | |
0e7d0c86 GJ |
292 | |
293 | input->id.bustype = BUS_HOST; | |
294 | input->id.vendor = 0x0001; | |
295 | input->id.product = 0x0001; | |
296 | input->id.version = 0x0100; | |
297 | ||
1a22e16f AS |
298 | __set_bit(EV_KEY, input->evbit); |
299 | if (pdata->rep) | |
300 | __set_bit(EV_REP, input->evbit); | |
301 | ||
0e7d0c86 GJ |
302 | for (i = 0; i < pdata->nbuttons; i++) { |
303 | struct gpio_keys_button *button = &pdata->buttons[i]; | |
304 | struct gpio_keys_button_data *bdata = &bdev->data[i]; | |
0e7d0c86 GJ |
305 | unsigned int type = button->type ?: EV_KEY; |
306 | ||
307 | if (button->wakeup) { | |
308 | dev_err(dev, DRV_NAME " does not support wakeup\n"); | |
68252638 | 309 | return -EINVAL; |
0e7d0c86 GJ |
310 | } |
311 | ||
633a21d8 AL |
312 | /* |
313 | * Legacy GPIO number so request the GPIO here and | |
314 | * convert it to descriptor. | |
315 | */ | |
316 | if (!button->gpiod && gpio_is_valid(button->gpio)) { | |
1ae5ddb6 | 317 | unsigned flags = GPIOF_IN; |
633a21d8 AL |
318 | |
319 | if (button->active_low) | |
320 | flags |= GPIOF_ACTIVE_LOW; | |
321 | ||
322 | error = devm_gpio_request_one(&pdev->dev, button->gpio, | |
323 | flags, button->desc ? : DRV_NAME); | |
324 | if (error) { | |
325 | dev_err(dev, "unable to claim gpio %u, err=%d\n", | |
326 | button->gpio, error); | |
327 | return error; | |
328 | } | |
329 | ||
330 | button->gpiod = gpio_to_desc(button->gpio); | |
0e7d0c86 | 331 | } |
0e7d0c86 | 332 | |
633a21d8 AL |
333 | if (IS_ERR(button->gpiod)) |
334 | return PTR_ERR(button->gpiod); | |
335 | ||
336 | bdata->can_sleep = gpiod_cansleep(button->gpiod); | |
0e7d0c86 GJ |
337 | bdata->last_state = -1; |
338 | bdata->threshold = DIV_ROUND_UP(button->debounce_interval, | |
339 | pdata->poll_interval); | |
340 | ||
341 | input_set_capability(input, type, button->code); | |
6f29d3b2 HG |
342 | if (type == EV_ABS) |
343 | gpio_keys_polled_set_abs_params(input, pdata, | |
344 | button->code); | |
0e7d0c86 GJ |
345 | } |
346 | ||
347 | bdev->poll_dev = poll_dev; | |
348 | bdev->dev = dev; | |
349 | bdev->pdata = pdata; | |
350 | platform_set_drvdata(pdev, bdev); | |
351 | ||
352 | error = input_register_polled_device(poll_dev); | |
353 | if (error) { | |
354 | dev_err(dev, "unable to register polled device, err=%d\n", | |
355 | error); | |
68252638 | 356 | return error; |
0e7d0c86 GJ |
357 | } |
358 | ||
359 | /* report initial state of the buttons */ | |
360 | for (i = 0; i < pdata->nbuttons; i++) | |
6f29d3b2 | 361 | gpio_keys_polled_check_state(poll_dev, &pdata->buttons[i], |
a2f25245 | 362 | &bdev->data[i]); |
0e7d0c86 | 363 | |
6f29d3b2 HG |
364 | input_sync(input); |
365 | ||
0e7d0c86 | 366 | return 0; |
0e7d0c86 GJ |
367 | } |
368 | ||
369 | static struct platform_driver gpio_keys_polled_driver = { | |
370 | .probe = gpio_keys_polled_probe, | |
0e7d0c86 GJ |
371 | .driver = { |
372 | .name = DRV_NAME, | |
b26d4e22 | 373 | .of_match_table = gpio_keys_polled_of_match, |
0e7d0c86 GJ |
374 | }, |
375 | }; | |
5146c84f | 376 | module_platform_driver(gpio_keys_polled_driver); |
0e7d0c86 GJ |
377 | |
378 | MODULE_LICENSE("GPL v2"); | |
379 | MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); | |
380 | MODULE_DESCRIPTION("Polled GPIO Buttons driver"); | |
381 | MODULE_ALIAS("platform:" DRV_NAME); |