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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for buttons on GPIO lines not capable of generating interrupts
4 *
5 * Copyright (C) 2007-2010 Gabor Juhos <juhosg@openwrt.org>
6 * Copyright (C) 2010 Nuno Goncalves <nunojpg@gmail.com>
7 *
8 * This file was based on: /drivers/input/misc/cobalt_btns.c
9 * Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
10 *
11 * also was based on: /drivers/input/keyboard/gpio_keys.c
12 * Copyright 2005 Phil Blundell
13 */
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/slab.h>
18#include <linux/input.h>
19#include <linux/ioport.h>
20#include <linux/platform_device.h>
21#include <linux/gpio.h>
22#include <linux/gpio/consumer.h>
23#include <linux/gpio_keys.h>
24#include <linux/property.h>
25
26#define DRV_NAME "gpio-keys-polled"
27
28struct gpio_keys_button_data {
29 struct gpio_desc *gpiod;
30 int last_state;
31 int count;
32 int threshold;
33};
34
35struct gpio_keys_polled_dev {
36 struct input_dev *input;
37 struct device *dev;
38 const struct gpio_keys_platform_data *pdata;
39 unsigned long rel_axis_seen[BITS_TO_LONGS(REL_CNT)];
40 unsigned long abs_axis_seen[BITS_TO_LONGS(ABS_CNT)];
41 struct gpio_keys_button_data data[];
42};
43
44static void gpio_keys_button_event(struct input_dev *input,
45 const struct gpio_keys_button *button,
46 int state)
47{
48 struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
49 unsigned int type = button->type ?: EV_KEY;
50
51 if (type == EV_REL) {
52 if (state) {
53 input_event(input, type, button->code, button->value);
54 __set_bit(button->code, bdev->rel_axis_seen);
55 }
56 } else if (type == EV_ABS) {
57 if (state) {
58 input_event(input, type, button->code, button->value);
59 __set_bit(button->code, bdev->abs_axis_seen);
60 }
61 } else {
62 input_event(input, type, button->code, state);
63 input_sync(input);
64 }
65}
66
67static void gpio_keys_polled_check_state(struct input_dev *input,
68 const struct gpio_keys_button *button,
69 struct gpio_keys_button_data *bdata)
70{
71 int state;
72
73 state = gpiod_get_value_cansleep(bdata->gpiod);
74 if (state < 0) {
75 dev_err(input->dev.parent,
76 "failed to get gpio state: %d\n", state);
77 } else {
78 gpio_keys_button_event(input, button, state);
79
80 if (state != bdata->last_state) {
81 bdata->count = 0;
82 bdata->last_state = state;
83 }
84 }
85}
86
87static void gpio_keys_polled_poll(struct input_dev *input)
88{
89 struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
90 const struct gpio_keys_platform_data *pdata = bdev->pdata;
91 int i;
92
93 memset(bdev->rel_axis_seen, 0, sizeof(bdev->rel_axis_seen));
94 memset(bdev->abs_axis_seen, 0, sizeof(bdev->abs_axis_seen));
95
96 for (i = 0; i < pdata->nbuttons; i++) {
97 struct gpio_keys_button_data *bdata = &bdev->data[i];
98
99 if (bdata->count < bdata->threshold) {
100 bdata->count++;
101 gpio_keys_button_event(input, &pdata->buttons[i],
102 bdata->last_state);
103 } else {
104 gpio_keys_polled_check_state(input, &pdata->buttons[i],
105 bdata);
106 }
107 }
108
109 for_each_set_bit(i, input->relbit, REL_CNT) {
110 if (!test_bit(i, bdev->rel_axis_seen))
111 input_event(input, EV_REL, i, 0);
112 }
113
114 for_each_set_bit(i, input->absbit, ABS_CNT) {
115 if (!test_bit(i, bdev->abs_axis_seen))
116 input_event(input, EV_ABS, i, 0);
117 }
118
119 input_sync(input);
120}
121
122static int gpio_keys_polled_open(struct input_dev *input)
123{
124 struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
125 const struct gpio_keys_platform_data *pdata = bdev->pdata;
126
127 if (pdata->enable)
128 pdata->enable(bdev->dev);
129
130 return 0;
131}
132
133static void gpio_keys_polled_close(struct input_dev *input)
134{
135 struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
136 const struct gpio_keys_platform_data *pdata = bdev->pdata;
137
138 if (pdata->disable)
139 pdata->disable(bdev->dev);
140}
141
142static struct gpio_keys_platform_data *
143gpio_keys_polled_get_devtree_pdata(struct device *dev)
144{
145 struct gpio_keys_platform_data *pdata;
146 struct gpio_keys_button *button;
147 int nbuttons;
148
149 nbuttons = device_get_child_node_count(dev);
150 if (nbuttons == 0)
151 return ERR_PTR(-EINVAL);
152
153 pdata = devm_kzalloc(dev, sizeof(*pdata) + nbuttons * sizeof(*button),
154 GFP_KERNEL);
155 if (!pdata)
156 return ERR_PTR(-ENOMEM);
157
158 button = (struct gpio_keys_button *)(pdata + 1);
159
160 pdata->buttons = button;
161 pdata->nbuttons = nbuttons;
162
163 pdata->rep = device_property_present(dev, "autorepeat");
164 device_property_read_u32(dev, "poll-interval", &pdata->poll_interval);
165
166 device_property_read_string(dev, "label", &pdata->name);
167
168 device_for_each_child_node_scoped(dev, child) {
169 if (fwnode_property_read_u32(child, "linux,code",
170 &button->code)) {
171 dev_err(dev, "button without keycode\n");
172 return ERR_PTR(-EINVAL);
173 }
174
175 fwnode_property_read_string(child, "label", &button->desc);
176
177 if (fwnode_property_read_u32(child, "linux,input-type",
178 &button->type))
179 button->type = EV_KEY;
180
181 if (fwnode_property_read_u32(child, "linux,input-value",
182 (u32 *)&button->value))
183 button->value = 1;
184
185 button->wakeup =
186 fwnode_property_read_bool(child, "wakeup-source") ||
187 /* legacy name */
188 fwnode_property_read_bool(child, "gpio-key,wakeup");
189
190 if (fwnode_property_read_u32(child, "debounce-interval",
191 &button->debounce_interval))
192 button->debounce_interval = 5;
193
194 button++;
195 }
196
197 return pdata;
198}
199
200static void gpio_keys_polled_set_abs_params(struct input_dev *input,
201 const struct gpio_keys_platform_data *pdata, unsigned int code)
202{
203 int i, min = 0, max = 0;
204
205 for (i = 0; i < pdata->nbuttons; i++) {
206 const struct gpio_keys_button *button = &pdata->buttons[i];
207
208 if (button->type != EV_ABS || button->code != code)
209 continue;
210
211 if (button->value < min)
212 min = button->value;
213 if (button->value > max)
214 max = button->value;
215 }
216
217 input_set_abs_params(input, code, min, max, 0, 0);
218}
219
220static const struct of_device_id gpio_keys_polled_of_match[] = {
221 { .compatible = "gpio-keys-polled", },
222 { },
223};
224MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match);
225
226static int gpio_keys_polled_probe(struct platform_device *pdev)
227{
228 struct device *dev = &pdev->dev;
229 struct fwnode_handle *child = NULL;
230 const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
231 struct gpio_keys_polled_dev *bdev;
232 struct input_dev *input;
233 int error;
234 int i;
235
236 if (!pdata) {
237 pdata = gpio_keys_polled_get_devtree_pdata(dev);
238 if (IS_ERR(pdata))
239 return PTR_ERR(pdata);
240 }
241
242 if (!pdata->poll_interval) {
243 dev_err(dev, "missing poll_interval value\n");
244 return -EINVAL;
245 }
246
247 bdev = devm_kzalloc(dev, struct_size(bdev, data, pdata->nbuttons),
248 GFP_KERNEL);
249 if (!bdev) {
250 dev_err(dev, "no memory for private data\n");
251 return -ENOMEM;
252 }
253
254 input = devm_input_allocate_device(dev);
255 if (!input) {
256 dev_err(dev, "no memory for input device\n");
257 return -ENOMEM;
258 }
259
260 input_set_drvdata(input, bdev);
261
262 input->name = pdata->name ?: pdev->name;
263 input->phys = DRV_NAME"/input0";
264
265 input->id.bustype = BUS_HOST;
266 input->id.vendor = 0x0001;
267 input->id.product = 0x0001;
268 input->id.version = 0x0100;
269
270 input->open = gpio_keys_polled_open;
271 input->close = gpio_keys_polled_close;
272
273 __set_bit(EV_KEY, input->evbit);
274 if (pdata->rep)
275 __set_bit(EV_REP, input->evbit);
276
277 for (i = 0; i < pdata->nbuttons; i++) {
278 const struct gpio_keys_button *button = &pdata->buttons[i];
279 struct gpio_keys_button_data *bdata = &bdev->data[i];
280 unsigned int type = button->type ?: EV_KEY;
281
282 if (button->wakeup) {
283 dev_err(dev, DRV_NAME " does not support wakeup\n");
284 fwnode_handle_put(child);
285 return -EINVAL;
286 }
287
288 if (!dev_get_platdata(dev)) {
289 /* No legacy static platform data */
290 child = device_get_next_child_node(dev, child);
291 if (!child) {
292 dev_err(dev, "missing child device node\n");
293 return -EINVAL;
294 }
295
296 bdata->gpiod = devm_fwnode_gpiod_get(dev, child,
297 NULL, GPIOD_IN,
298 button->desc);
299 if (IS_ERR(bdata->gpiod)) {
300 fwnode_handle_put(child);
301 return dev_err_probe(dev, PTR_ERR(bdata->gpiod),
302 "failed to get gpio\n");
303 }
304 } else if (gpio_is_valid(button->gpio)) {
305 /*
306 * Legacy GPIO number so request the GPIO here and
307 * convert it to descriptor.
308 */
309 error = devm_gpio_request_one(dev, button->gpio, GPIOF_IN,
310 button->desc ? : DRV_NAME);
311 if (error)
312 return dev_err_probe(dev, error,
313 "unable to claim gpio %u\n",
314 button->gpio);
315
316 bdata->gpiod = gpio_to_desc(button->gpio);
317 if (!bdata->gpiod) {
318 dev_err(dev,
319 "unable to convert gpio %u to descriptor\n",
320 button->gpio);
321 return -EINVAL;
322 }
323
324 if (button->active_low ^ gpiod_is_active_low(bdata->gpiod))
325 gpiod_toggle_active_low(bdata->gpiod);
326 }
327
328 bdata->last_state = -1;
329 bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
330 pdata->poll_interval);
331
332 input_set_capability(input, type, button->code);
333 if (type == EV_ABS)
334 gpio_keys_polled_set_abs_params(input, pdata,
335 button->code);
336 }
337
338 fwnode_handle_put(child);
339
340 bdev->input = input;
341 bdev->dev = dev;
342 bdev->pdata = pdata;
343
344 error = input_setup_polling(input, gpio_keys_polled_poll);
345 if (error) {
346 dev_err(dev, "unable to set up polling, err=%d\n", error);
347 return error;
348 }
349
350 input_set_poll_interval(input, pdata->poll_interval);
351
352 error = input_register_device(input);
353 if (error) {
354 dev_err(dev, "unable to register polled device, err=%d\n",
355 error);
356 return error;
357 }
358
359 /* report initial state of the buttons */
360 for (i = 0; i < pdata->nbuttons; i++)
361 gpio_keys_polled_check_state(input, &pdata->buttons[i],
362 &bdev->data[i]);
363
364 input_sync(input);
365
366 return 0;
367}
368
369static struct platform_driver gpio_keys_polled_driver = {
370 .probe = gpio_keys_polled_probe,
371 .driver = {
372 .name = DRV_NAME,
373 .of_match_table = gpio_keys_polled_of_match,
374 },
375};
376module_platform_driver(gpio_keys_polled_driver);
377
378MODULE_LICENSE("GPL v2");
379MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
380MODULE_DESCRIPTION("Polled GPIO Buttons driver");
381MODULE_ALIAS("platform:" DRV_NAME);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for buttons on GPIO lines not capable of generating interrupts
4 *
5 * Copyright (C) 2007-2010 Gabor Juhos <juhosg@openwrt.org>
6 * Copyright (C) 2010 Nuno Goncalves <nunojpg@gmail.com>
7 *
8 * This file was based on: /drivers/input/misc/cobalt_btns.c
9 * Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
10 *
11 * also was based on: /drivers/input/keyboard/gpio_keys.c
12 * Copyright 2005 Phil Blundell
13 */
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/slab.h>
18#include <linux/input.h>
19#include <linux/input-polldev.h>
20#include <linux/ioport.h>
21#include <linux/platform_device.h>
22#include <linux/gpio.h>
23#include <linux/gpio/consumer.h>
24#include <linux/gpio_keys.h>
25#include <linux/property.h>
26
27#define DRV_NAME "gpio-keys-polled"
28
29struct gpio_keys_button_data {
30 struct gpio_desc *gpiod;
31 int last_state;
32 int count;
33 int threshold;
34};
35
36struct gpio_keys_polled_dev {
37 struct input_polled_dev *poll_dev;
38 struct device *dev;
39 const struct gpio_keys_platform_data *pdata;
40 unsigned long rel_axis_seen[BITS_TO_LONGS(REL_CNT)];
41 unsigned long abs_axis_seen[BITS_TO_LONGS(ABS_CNT)];
42 struct gpio_keys_button_data data[0];
43};
44
45static void gpio_keys_button_event(struct input_polled_dev *dev,
46 const struct gpio_keys_button *button,
47 int state)
48{
49 struct gpio_keys_polled_dev *bdev = dev->private;
50 struct input_dev *input = dev->input;
51 unsigned int type = button->type ?: EV_KEY;
52
53 if (type == EV_REL) {
54 if (state) {
55 input_event(input, type, button->code, button->value);
56 __set_bit(button->code, bdev->rel_axis_seen);
57 }
58 } else if (type == EV_ABS) {
59 if (state) {
60 input_event(input, type, button->code, button->value);
61 __set_bit(button->code, bdev->abs_axis_seen);
62 }
63 } else {
64 input_event(input, type, button->code, state);
65 input_sync(input);
66 }
67}
68
69static void gpio_keys_polled_check_state(struct input_polled_dev *dev,
70 const struct gpio_keys_button *button,
71 struct gpio_keys_button_data *bdata)
72{
73 int state;
74
75 state = gpiod_get_value_cansleep(bdata->gpiod);
76 if (state < 0) {
77 dev_err(dev->input->dev.parent,
78 "failed to get gpio state: %d\n", state);
79 } else {
80 gpio_keys_button_event(dev, button, state);
81
82 if (state != bdata->last_state) {
83 bdata->count = 0;
84 bdata->last_state = state;
85 }
86 }
87}
88
89static void gpio_keys_polled_poll(struct input_polled_dev *dev)
90{
91 struct gpio_keys_polled_dev *bdev = dev->private;
92 const struct gpio_keys_platform_data *pdata = bdev->pdata;
93 struct input_dev *input = dev->input;
94 int i;
95
96 memset(bdev->rel_axis_seen, 0, sizeof(bdev->rel_axis_seen));
97 memset(bdev->abs_axis_seen, 0, sizeof(bdev->abs_axis_seen));
98
99 for (i = 0; i < pdata->nbuttons; i++) {
100 struct gpio_keys_button_data *bdata = &bdev->data[i];
101
102 if (bdata->count < bdata->threshold) {
103 bdata->count++;
104 gpio_keys_button_event(dev, &pdata->buttons[i],
105 bdata->last_state);
106 } else {
107 gpio_keys_polled_check_state(dev, &pdata->buttons[i],
108 bdata);
109 }
110 }
111
112 for_each_set_bit(i, input->relbit, REL_CNT) {
113 if (!test_bit(i, bdev->rel_axis_seen))
114 input_event(input, EV_REL, i, 0);
115 }
116
117 for_each_set_bit(i, input->absbit, ABS_CNT) {
118 if (!test_bit(i, bdev->abs_axis_seen))
119 input_event(input, EV_ABS, i, 0);
120 }
121
122 input_sync(input);
123}
124
125static void gpio_keys_polled_open(struct input_polled_dev *dev)
126{
127 struct gpio_keys_polled_dev *bdev = dev->private;
128 const struct gpio_keys_platform_data *pdata = bdev->pdata;
129
130 if (pdata->enable)
131 pdata->enable(bdev->dev);
132}
133
134static void gpio_keys_polled_close(struct input_polled_dev *dev)
135{
136 struct gpio_keys_polled_dev *bdev = dev->private;
137 const struct gpio_keys_platform_data *pdata = bdev->pdata;
138
139 if (pdata->disable)
140 pdata->disable(bdev->dev);
141}
142
143static struct gpio_keys_platform_data *
144gpio_keys_polled_get_devtree_pdata(struct device *dev)
145{
146 struct gpio_keys_platform_data *pdata;
147 struct gpio_keys_button *button;
148 struct fwnode_handle *child;
149 int nbuttons;
150
151 nbuttons = device_get_child_node_count(dev);
152 if (nbuttons == 0)
153 return ERR_PTR(-EINVAL);
154
155 pdata = devm_kzalloc(dev, sizeof(*pdata) + nbuttons * sizeof(*button),
156 GFP_KERNEL);
157 if (!pdata)
158 return ERR_PTR(-ENOMEM);
159
160 button = (struct gpio_keys_button *)(pdata + 1);
161
162 pdata->buttons = button;
163 pdata->nbuttons = nbuttons;
164
165 pdata->rep = device_property_present(dev, "autorepeat");
166 device_property_read_u32(dev, "poll-interval", &pdata->poll_interval);
167
168 device_property_read_string(dev, "label", &pdata->name);
169
170 device_for_each_child_node(dev, child) {
171 if (fwnode_property_read_u32(child, "linux,code",
172 &button->code)) {
173 dev_err(dev, "button without keycode\n");
174 fwnode_handle_put(child);
175 return ERR_PTR(-EINVAL);
176 }
177
178 fwnode_property_read_string(child, "label", &button->desc);
179
180 if (fwnode_property_read_u32(child, "linux,input-type",
181 &button->type))
182 button->type = EV_KEY;
183
184 if (fwnode_property_read_u32(child, "linux,input-value",
185 (u32 *)&button->value))
186 button->value = 1;
187
188 button->wakeup =
189 fwnode_property_read_bool(child, "wakeup-source") ||
190 /* legacy name */
191 fwnode_property_read_bool(child, "gpio-key,wakeup");
192
193 if (fwnode_property_read_u32(child, "debounce-interval",
194 &button->debounce_interval))
195 button->debounce_interval = 5;
196
197 button++;
198 }
199
200 return pdata;
201}
202
203static void gpio_keys_polled_set_abs_params(struct input_dev *input,
204 const struct gpio_keys_platform_data *pdata, unsigned int code)
205{
206 int i, min = 0, max = 0;
207
208 for (i = 0; i < pdata->nbuttons; i++) {
209 const struct gpio_keys_button *button = &pdata->buttons[i];
210
211 if (button->type != EV_ABS || button->code != code)
212 continue;
213
214 if (button->value < min)
215 min = button->value;
216 if (button->value > max)
217 max = button->value;
218 }
219
220 input_set_abs_params(input, code, min, max, 0, 0);
221}
222
223static const struct of_device_id gpio_keys_polled_of_match[] = {
224 { .compatible = "gpio-keys-polled", },
225 { },
226};
227MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match);
228
229static int gpio_keys_polled_probe(struct platform_device *pdev)
230{
231 struct device *dev = &pdev->dev;
232 struct fwnode_handle *child = NULL;
233 const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
234 struct gpio_keys_polled_dev *bdev;
235 struct input_polled_dev *poll_dev;
236 struct input_dev *input;
237 int error;
238 int i;
239
240 if (!pdata) {
241 pdata = gpio_keys_polled_get_devtree_pdata(dev);
242 if (IS_ERR(pdata))
243 return PTR_ERR(pdata);
244 }
245
246 if (!pdata->poll_interval) {
247 dev_err(dev, "missing poll_interval value\n");
248 return -EINVAL;
249 }
250
251 bdev = devm_kzalloc(dev, struct_size(bdev, data, pdata->nbuttons),
252 GFP_KERNEL);
253 if (!bdev) {
254 dev_err(dev, "no memory for private data\n");
255 return -ENOMEM;
256 }
257
258 poll_dev = devm_input_allocate_polled_device(dev);
259 if (!poll_dev) {
260 dev_err(dev, "no memory for polled device\n");
261 return -ENOMEM;
262 }
263
264 poll_dev->private = bdev;
265 poll_dev->poll = gpio_keys_polled_poll;
266 poll_dev->poll_interval = pdata->poll_interval;
267 poll_dev->open = gpio_keys_polled_open;
268 poll_dev->close = gpio_keys_polled_close;
269
270 input = poll_dev->input;
271
272 input->name = pdata->name ?: pdev->name;
273 input->phys = DRV_NAME"/input0";
274
275 input->id.bustype = BUS_HOST;
276 input->id.vendor = 0x0001;
277 input->id.product = 0x0001;
278 input->id.version = 0x0100;
279
280 __set_bit(EV_KEY, input->evbit);
281 if (pdata->rep)
282 __set_bit(EV_REP, input->evbit);
283
284 for (i = 0; i < pdata->nbuttons; i++) {
285 const struct gpio_keys_button *button = &pdata->buttons[i];
286 struct gpio_keys_button_data *bdata = &bdev->data[i];
287 unsigned int type = button->type ?: EV_KEY;
288
289 if (button->wakeup) {
290 dev_err(dev, DRV_NAME " does not support wakeup\n");
291 fwnode_handle_put(child);
292 return -EINVAL;
293 }
294
295 if (!dev_get_platdata(dev)) {
296 /* No legacy static platform data */
297 child = device_get_next_child_node(dev, child);
298 if (!child) {
299 dev_err(dev, "missing child device node\n");
300 return -EINVAL;
301 }
302
303 bdata->gpiod = devm_fwnode_get_gpiod_from_child(dev,
304 NULL, child,
305 GPIOD_IN,
306 button->desc);
307 if (IS_ERR(bdata->gpiod)) {
308 error = PTR_ERR(bdata->gpiod);
309 if (error != -EPROBE_DEFER)
310 dev_err(dev,
311 "failed to get gpio: %d\n",
312 error);
313 fwnode_handle_put(child);
314 return error;
315 }
316 } else if (gpio_is_valid(button->gpio)) {
317 /*
318 * Legacy GPIO number so request the GPIO here and
319 * convert it to descriptor.
320 */
321 unsigned flags = GPIOF_IN;
322
323 if (button->active_low)
324 flags |= GPIOF_ACTIVE_LOW;
325
326 error = devm_gpio_request_one(dev, button->gpio,
327 flags, button->desc ? : DRV_NAME);
328 if (error) {
329 dev_err(dev,
330 "unable to claim gpio %u, err=%d\n",
331 button->gpio, error);
332 return error;
333 }
334
335 bdata->gpiod = gpio_to_desc(button->gpio);
336 if (!bdata->gpiod) {
337 dev_err(dev,
338 "unable to convert gpio %u to descriptor\n",
339 button->gpio);
340 return -EINVAL;
341 }
342 }
343
344 bdata->last_state = -1;
345 bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
346 pdata->poll_interval);
347
348 input_set_capability(input, type, button->code);
349 if (type == EV_ABS)
350 gpio_keys_polled_set_abs_params(input, pdata,
351 button->code);
352 }
353
354 fwnode_handle_put(child);
355
356 bdev->poll_dev = poll_dev;
357 bdev->dev = dev;
358 bdev->pdata = pdata;
359
360 error = input_register_polled_device(poll_dev);
361 if (error) {
362 dev_err(dev, "unable to register polled device, err=%d\n",
363 error);
364 return error;
365 }
366
367 /* report initial state of the buttons */
368 for (i = 0; i < pdata->nbuttons; i++)
369 gpio_keys_polled_check_state(poll_dev, &pdata->buttons[i],
370 &bdev->data[i]);
371
372 input_sync(input);
373
374 return 0;
375}
376
377static struct platform_driver gpio_keys_polled_driver = {
378 .probe = gpio_keys_polled_probe,
379 .driver = {
380 .name = DRV_NAME,
381 .of_match_table = gpio_keys_polled_of_match,
382 },
383};
384module_platform_driver(gpio_keys_polled_driver);
385
386MODULE_LICENSE("GPL v2");
387MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
388MODULE_DESCRIPTION("Polled GPIO Buttons driver");
389MODULE_ALIAS("platform:" DRV_NAME);