1 // SPDX-License-Identifier: GPL-2.0-only
2 /***************************************************************************
3  *   Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org>  *
4  *                                                                         *
5  *   Based on Logitech G13 driver (v0.4)                                   *
6  *     Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu>   *
7  *                                                                         *
8  ***************************************************************************/
9 
10 #include <linux/hid.h>
11 #include <linux/hid-debug.h>
12 #include <linux/input.h>
13 #include "hid-ids.h"
14 
15 #include <linux/fb.h>
16 #include <linux/vmalloc.h>
17 
18 #include <linux/completion.h>
19 #include <linux/uaccess.h>
20 #include <linux/module.h>
21 #include <linux/string.h>
22 
23 #include "hid-picolcd.h"
24 
25 
26 /* Input device
27  *
28  * The PicoLCD has an IR receiver header, a built-in keypad with 5 keys
29  * and header for 4x4 key matrix. The built-in keys are part of the matrix.
30  */
31 static const unsigned short def_keymap[PICOLCD_KEYS] = {
32 	KEY_RESERVED,	/* none */
33 	KEY_BACK,	/* col 4 + row 1 */
34 	KEY_HOMEPAGE,	/* col 3 + row 1 */
35 	KEY_RESERVED,	/* col 2 + row 1 */
36 	KEY_RESERVED,	/* col 1 + row 1 */
37 	KEY_SCROLLUP,	/* col 4 + row 2 */
38 	KEY_OK,		/* col 3 + row 2 */
39 	KEY_SCROLLDOWN,	/* col 2 + row 2 */
40 	KEY_RESERVED,	/* col 1 + row 2 */
41 	KEY_RESERVED,	/* col 4 + row 3 */
42 	KEY_RESERVED,	/* col 3 + row 3 */
43 	KEY_RESERVED,	/* col 2 + row 3 */
44 	KEY_RESERVED,	/* col 1 + row 3 */
45 	KEY_RESERVED,	/* col 4 + row 4 */
46 	KEY_RESERVED,	/* col 3 + row 4 */
47 	KEY_RESERVED,	/* col 2 + row 4 */
48 	KEY_RESERVED,	/* col 1 + row 4 */
49 };
50 
51 
52 /* Find a given report */
53 struct hid_report *picolcd_report(int id, struct hid_device *hdev, int dir)
54 {
55 	struct list_head *feature_report_list = &hdev->report_enum[dir].report_list;
56 	struct hid_report *report = NULL;
57 
58 	list_for_each_entry(report, feature_report_list, list) {
59 		if (report->id == id)
60 			return report;
61 	}
62 	hid_warn(hdev, "No report with id 0x%x found\n", id);
63 	return NULL;
64 }
65 
66 /* Submit a report and wait for a reply from device - if device fades away
67  * or does not respond in time, return NULL */
68 struct picolcd_pending *picolcd_send_and_wait(struct hid_device *hdev,
69 		int report_id, const u8 *raw_data, int size)
70 {
71 	struct picolcd_data *data = hid_get_drvdata(hdev);
72 	struct picolcd_pending *work;
73 	struct hid_report *report = picolcd_out_report(report_id, hdev);
74 	unsigned long flags;
75 	int i, j, k;
76 
77 	if (!report || !data)
78 		return NULL;
79 	if (data->status & PICOLCD_FAILED)
80 		return NULL;
81 	work = kzalloc(sizeof(*work), GFP_KERNEL);
82 	if (!work)
83 		return NULL;
84 
85 	init_completion(&work->ready);
86 	work->out_report = report;
87 	work->in_report  = NULL;
88 	work->raw_size   = 0;
89 
90 	mutex_lock(&data->mutex);
91 	spin_lock_irqsave(&data->lock, flags);
92 	for (i = k = 0; i < report->maxfield; i++)
93 		for (j = 0; j < report->field[i]->report_count; j++) {
94 			hid_set_field(report->field[i], j, k < size ? raw_data[k] : 0);
95 			k++;
96 		}
97 	if (data->status & PICOLCD_FAILED) {
98 		kfree(work);
99 		work = NULL;
100 	} else {
101 		data->pending = work;
102 		hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT);
103 		spin_unlock_irqrestore(&data->lock, flags);
104 		wait_for_completion_interruptible_timeout(&work->ready, HZ*2);
105 		spin_lock_irqsave(&data->lock, flags);
106 		data->pending = NULL;
107 	}
108 	spin_unlock_irqrestore(&data->lock, flags);
109 	mutex_unlock(&data->mutex);
110 	return work;
111 }
112 
113 /*
114  * input class device
115  */
116 static int picolcd_raw_keypad(struct picolcd_data *data,
117 		struct hid_report *report, u8 *raw_data, int size)
118 {
119 	/*
120 	 * Keypad event
121 	 * First and second data bytes list currently pressed keys,
122 	 * 0x00 means no key and at most 2 keys may be pressed at same time
123 	 */
124 	int i, j;
125 
126 	/* determine newly pressed keys */
127 	for (i = 0; i < size; i++) {
128 		unsigned int key_code;
129 		if (raw_data[i] == 0)
130 			continue;
131 		for (j = 0; j < sizeof(data->pressed_keys); j++)
132 			if (data->pressed_keys[j] == raw_data[i])
133 				goto key_already_down;
134 		for (j = 0; j < sizeof(data->pressed_keys); j++)
135 			if (data->pressed_keys[j] == 0) {
136 				data->pressed_keys[j] = raw_data[i];
137 				break;
138 			}
139 		input_event(data->input_keys, EV_MSC, MSC_SCAN, raw_data[i]);
140 		if (raw_data[i] < PICOLCD_KEYS)
141 			key_code = data->keycode[raw_data[i]];
142 		else
143 			key_code = KEY_UNKNOWN;
144 		if (key_code != KEY_UNKNOWN) {
145 			dbg_hid(PICOLCD_NAME " got key press for %u:%d",
146 					raw_data[i], key_code);
147 			input_report_key(data->input_keys, key_code, 1);
148 		}
149 		input_sync(data->input_keys);
150 key_already_down:
151 		continue;
152 	}
153 
154 	/* determine newly released keys */
155 	for (j = 0; j < sizeof(data->pressed_keys); j++) {
156 		unsigned int key_code;
157 		if (data->pressed_keys[j] == 0)
158 			continue;
159 		for (i = 0; i < size; i++)
160 			if (data->pressed_keys[j] == raw_data[i])
161 				goto key_still_down;
162 		input_event(data->input_keys, EV_MSC, MSC_SCAN, data->pressed_keys[j]);
163 		if (data->pressed_keys[j] < PICOLCD_KEYS)
164 			key_code = data->keycode[data->pressed_keys[j]];
165 		else
166 			key_code = KEY_UNKNOWN;
167 		if (key_code != KEY_UNKNOWN) {
168 			dbg_hid(PICOLCD_NAME " got key release for %u:%d",
169 					data->pressed_keys[j], key_code);
170 			input_report_key(data->input_keys, key_code, 0);
171 		}
172 		input_sync(data->input_keys);
173 		data->pressed_keys[j] = 0;
174 key_still_down:
175 		continue;
176 	}
177 	return 1;
178 }
179 
180 static int picolcd_check_version(struct hid_device *hdev)
181 {
182 	struct picolcd_data *data = hid_get_drvdata(hdev);
183 	struct picolcd_pending *verinfo;
184 	int ret = 0;
185 
186 	if (!data)
187 		return -ENODEV;
188 
189 	verinfo = picolcd_send_and_wait(hdev, REPORT_VERSION, NULL, 0);
190 	if (!verinfo) {
191 		hid_err(hdev, "no version response from PicoLCD\n");
192 		return -ENODEV;
193 	}
194 
195 	if (verinfo->raw_size == 2) {
196 		data->version[0] = verinfo->raw_data[1];
197 		data->version[1] = verinfo->raw_data[0];
198 		if (data->status & PICOLCD_BOOTLOADER) {
199 			hid_info(hdev, "PicoLCD, bootloader version %d.%d\n",
200 				 verinfo->raw_data[1], verinfo->raw_data[0]);
201 		} else {
202 			hid_info(hdev, "PicoLCD, firmware version %d.%d\n",
203 				 verinfo->raw_data[1], verinfo->raw_data[0]);
204 		}
205 	} else {
206 		hid_err(hdev, "confused, got unexpected version response from PicoLCD\n");
207 		ret = -EINVAL;
208 	}
209 	kfree(verinfo);
210 	return ret;
211 }
212 
213 /*
214  * Reset our device and wait for answer to VERSION request
215  */
216 int picolcd_reset(struct hid_device *hdev)
217 {
218 	struct picolcd_data *data = hid_get_drvdata(hdev);
219 	struct hid_report *report = picolcd_out_report(REPORT_RESET, hdev);
220 	unsigned long flags;
221 	int error;
222 
223 	if (!data || !report || report->maxfield != 1)
224 		return -ENODEV;
225 
226 	spin_lock_irqsave(&data->lock, flags);
227 	if (hdev->product == USB_DEVICE_ID_PICOLCD_BOOTLOADER)
228 		data->status |= PICOLCD_BOOTLOADER;
229 
230 	/* perform the reset */
231 	hid_set_field(report->field[0], 0, 1);
232 	if (data->status & PICOLCD_FAILED) {
233 		spin_unlock_irqrestore(&data->lock, flags);
234 		return -ENODEV;
235 	}
236 	hid_hw_request(hdev, report, HID_REQ_SET_REPORT);
237 	spin_unlock_irqrestore(&data->lock, flags);
238 
239 	error = picolcd_check_version(hdev);
240 	if (error)
241 		return error;
242 
243 	picolcd_resume_lcd(data);
244 	picolcd_resume_backlight(data);
245 	picolcd_fb_refresh(data);
246 	picolcd_leds_set(data);
247 	return 0;
248 }
249 
250 /*
251  * The "operation_mode" sysfs attribute
252  */
253 static ssize_t picolcd_operation_mode_show(struct device *dev,
254 		struct device_attribute *attr, char *buf)
255 {
256 	struct picolcd_data *data = dev_get_drvdata(dev);
257 
258 	if (data->status & PICOLCD_BOOTLOADER)
259 		return snprintf(buf, PAGE_SIZE, "[bootloader] lcd\n");
260 	else
261 		return snprintf(buf, PAGE_SIZE, "bootloader [lcd]\n");
262 }
263 
264 static ssize_t picolcd_operation_mode_store(struct device *dev,
265 		struct device_attribute *attr, const char *buf, size_t count)
266 {
267 	struct picolcd_data *data = dev_get_drvdata(dev);
268 	struct hid_report *report = NULL;
269 	int timeout = data->opmode_delay;
270 	unsigned long flags;
271 
272 	if (sysfs_streq(buf, "lcd")) {
273 		if (data->status & PICOLCD_BOOTLOADER)
274 			report = picolcd_out_report(REPORT_EXIT_FLASHER, data->hdev);
275 	} else if (sysfs_streq(buf, "bootloader")) {
276 		if (!(data->status & PICOLCD_BOOTLOADER))
277 			report = picolcd_out_report(REPORT_EXIT_KEYBOARD, data->hdev);
278 	} else {
279 		return -EINVAL;
280 	}
281 
282 	if (!report || report->maxfield != 1)
283 		return -EINVAL;
284 
285 	spin_lock_irqsave(&data->lock, flags);
286 	hid_set_field(report->field[0], 0, timeout & 0xff);
287 	hid_set_field(report->field[0], 1, (timeout >> 8) & 0xff);
288 	hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT);
289 	spin_unlock_irqrestore(&data->lock, flags);
290 	return count;
291 }
292 
293 static DEVICE_ATTR(operation_mode, 0644, picolcd_operation_mode_show,
294 		picolcd_operation_mode_store);
295 
296 /*
297  * The "operation_mode_delay" sysfs attribute
298  */
299 static ssize_t picolcd_operation_mode_delay_show(struct device *dev,
300 		struct device_attribute *attr, char *buf)
301 {
302 	struct picolcd_data *data = dev_get_drvdata(dev);
303 
304 	return snprintf(buf, PAGE_SIZE, "%hu\n", data->opmode_delay);
305 }
306 
307 static ssize_t picolcd_operation_mode_delay_store(struct device *dev,
308 		struct device_attribute *attr, const char *buf, size_t count)
309 {
310 	struct picolcd_data *data = dev_get_drvdata(dev);
311 	unsigned u;
312 	if (sscanf(buf, "%u", &u) != 1)
313 		return -EINVAL;
314 	if (u > 30000)
315 		return -EINVAL;
316 	else
317 		data->opmode_delay = u;
318 	return count;
319 }
320 
321 static DEVICE_ATTR(operation_mode_delay, 0644, picolcd_operation_mode_delay_show,
322 		picolcd_operation_mode_delay_store);
323 
324 /*
325  * Handle raw report as sent by device
326  */
327 static int picolcd_raw_event(struct hid_device *hdev,
328 		struct hid_report *report, u8 *raw_data, int size)
329 {
330 	struct picolcd_data *data = hid_get_drvdata(hdev);
331 	unsigned long flags;
332 
333 	if (!data)
334 		return 1;
335 
336 	if (size > 64) {
337 		hid_warn(hdev, "invalid size value (%d) for picolcd raw event (%d)\n",
338 				size, report->id);
339 		return 0;
340 	}
341 
342 	if (report->id == REPORT_KEY_STATE) {
343 		if (data->input_keys)
344 			picolcd_raw_keypad(data, report, raw_data+1, size-1);
345 	} else if (report->id == REPORT_IR_DATA) {
346 		picolcd_raw_cir(data, report, raw_data+1, size-1);
347 	} else {
348 		spin_lock_irqsave(&data->lock, flags);
349 		/*
350 		 * We let the caller of picolcd_send_and_wait() check if the
351 		 * report we got is one of the expected ones or not.
352 		 */
353 		if (data->pending) {
354 			memcpy(data->pending->raw_data, raw_data+1, size-1);
355 			data->pending->raw_size  = size-1;
356 			data->pending->in_report = report;
357 			complete(&data->pending->ready);
358 		}
359 		spin_unlock_irqrestore(&data->lock, flags);
360 	}
361 
362 	picolcd_debug_raw_event(data, hdev, report, raw_data, size);
363 	return 1;
364 }
365 
366 #ifdef CONFIG_PM
367 static int picolcd_suspend(struct hid_device *hdev, pm_message_t message)
368 {
369 	if (PMSG_IS_AUTO(message))
370 		return 0;
371 
372 	picolcd_suspend_backlight(hid_get_drvdata(hdev));
373 	dbg_hid(PICOLCD_NAME " device ready for suspend\n");
374 	return 0;
375 }
376 
377 static int picolcd_resume(struct hid_device *hdev)
378 {
379 	int ret;
380 	ret = picolcd_resume_backlight(hid_get_drvdata(hdev));
381 	if (ret)
382 		dbg_hid(PICOLCD_NAME " restoring backlight failed: %d\n", ret);
383 	return 0;
384 }
385 
386 static int picolcd_reset_resume(struct hid_device *hdev)
387 {
388 	int ret;
389 	ret = picolcd_reset(hdev);
390 	if (ret)
391 		dbg_hid(PICOLCD_NAME " resetting our device failed: %d\n", ret);
392 	ret = picolcd_fb_reset(hid_get_drvdata(hdev), 0);
393 	if (ret)
394 		dbg_hid(PICOLCD_NAME " restoring framebuffer content failed: %d\n", ret);
395 	ret = picolcd_resume_lcd(hid_get_drvdata(hdev));
396 	if (ret)
397 		dbg_hid(PICOLCD_NAME " restoring lcd failed: %d\n", ret);
398 	ret = picolcd_resume_backlight(hid_get_drvdata(hdev));
399 	if (ret)
400 		dbg_hid(PICOLCD_NAME " restoring backlight failed: %d\n", ret);
401 	picolcd_leds_set(hid_get_drvdata(hdev));
402 	return 0;
403 }
404 #endif
405 
406 /* initialize keypad input device */
407 static int picolcd_init_keys(struct picolcd_data *data,
408 		struct hid_report *report)
409 {
410 	struct hid_device *hdev = data->hdev;
411 	struct input_dev *idev;
412 	int error, i;
413 
414 	if (!report)
415 		return -ENODEV;
416 	if (report->maxfield != 1 || report->field[0]->report_count != 2 ||
417 			report->field[0]->report_size != 8) {
418 		hid_err(hdev, "unsupported KEY_STATE report\n");
419 		return -EINVAL;
420 	}
421 
422 	idev = input_allocate_device();
423 	if (idev == NULL) {
424 		hid_err(hdev, "failed to allocate input device\n");
425 		return -ENOMEM;
426 	}
427 	input_set_drvdata(idev, hdev);
428 	memcpy(data->keycode, def_keymap, sizeof(def_keymap));
429 	idev->name = hdev->name;
430 	idev->phys = hdev->phys;
431 	idev->uniq = hdev->uniq;
432 	idev->id.bustype = hdev->bus;
433 	idev->id.vendor  = hdev->vendor;
434 	idev->id.product = hdev->product;
435 	idev->id.version = hdev->version;
436 	idev->dev.parent = &hdev->dev;
437 	idev->keycode     = &data->keycode;
438 	idev->keycodemax  = PICOLCD_KEYS;
439 	idev->keycodesize = sizeof(data->keycode[0]);
440 	input_set_capability(idev, EV_MSC, MSC_SCAN);
441 	set_bit(EV_REP, idev->evbit);
442 	for (i = 0; i < PICOLCD_KEYS; i++)
443 		input_set_capability(idev, EV_KEY, data->keycode[i]);
444 	error = input_register_device(idev);
445 	if (error) {
446 		hid_err(hdev, "error registering the input device\n");
447 		input_free_device(idev);
448 		return error;
449 	}
450 	data->input_keys = idev;
451 	return 0;
452 }
453 
454 static void picolcd_exit_keys(struct picolcd_data *data)
455 {
456 	struct input_dev *idev = data->input_keys;
457 
458 	data->input_keys = NULL;
459 	if (idev)
460 		input_unregister_device(idev);
461 }
462 
463 static int picolcd_probe_lcd(struct hid_device *hdev, struct picolcd_data *data)
464 {
465 	int error;
466 
467 	/* Setup keypad input device */
468 	error = picolcd_init_keys(data, picolcd_in_report(REPORT_KEY_STATE, hdev));
469 	if (error)
470 		goto err;
471 
472 	/* Setup CIR input device */
473 	error = picolcd_init_cir(data, picolcd_in_report(REPORT_IR_DATA, hdev));
474 	if (error)
475 		goto err;
476 
477 	/* Set up the framebuffer device */
478 	error = picolcd_init_framebuffer(data);
479 	if (error)
480 		goto err;
481 
482 	/* Setup lcd class device */
483 	error = picolcd_init_lcd(data, picolcd_out_report(REPORT_CONTRAST, hdev));
484 	if (error)
485 		goto err;
486 
487 	/* Setup backlight class device */
488 	error = picolcd_init_backlight(data, picolcd_out_report(REPORT_BRIGHTNESS, hdev));
489 	if (error)
490 		goto err;
491 
492 	/* Setup the LED class devices */
493 	error = picolcd_init_leds(data, picolcd_out_report(REPORT_LED_STATE, hdev));
494 	if (error)
495 		goto err;
496 
497 	picolcd_init_devfs(data, picolcd_out_report(REPORT_EE_READ, hdev),
498 			picolcd_out_report(REPORT_EE_WRITE, hdev),
499 			picolcd_out_report(REPORT_READ_MEMORY, hdev),
500 			picolcd_out_report(REPORT_WRITE_MEMORY, hdev),
501 			picolcd_out_report(REPORT_RESET, hdev));
502 	return 0;
503 err:
504 	picolcd_exit_leds(data);
505 	picolcd_exit_backlight(data);
506 	picolcd_exit_lcd(data);
507 	picolcd_exit_framebuffer(data);
508 	picolcd_exit_cir(data);
509 	picolcd_exit_keys(data);
510 	return error;
511 }
512 
513 static int picolcd_probe_bootloader(struct hid_device *hdev, struct picolcd_data *data)
514 {
515 	picolcd_init_devfs(data, NULL, NULL,
516 			picolcd_out_report(REPORT_BL_READ_MEMORY, hdev),
517 			picolcd_out_report(REPORT_BL_WRITE_MEMORY, hdev), NULL);
518 	return 0;
519 }
520 
521 static int picolcd_probe(struct hid_device *hdev,
522 		     const struct hid_device_id *id)
523 {
524 	struct picolcd_data *data;
525 	int error = -ENOMEM;
526 
527 	dbg_hid(PICOLCD_NAME " hardware probe...\n");
528 
529 	/*
530 	 * Let's allocate the picolcd data structure, set some reasonable
531 	 * defaults, and associate it with the device
532 	 */
533 	data = kzalloc(sizeof(struct picolcd_data), GFP_KERNEL);
534 	if (data == NULL) {
535 		hid_err(hdev, "can't allocate space for Minibox PicoLCD device data\n");
536 		return -ENOMEM;
537 	}
538 
539 	spin_lock_init(&data->lock);
540 	mutex_init(&data->mutex);
541 	data->hdev = hdev;
542 	data->opmode_delay = 5000;
543 	if (hdev->product == USB_DEVICE_ID_PICOLCD_BOOTLOADER)
544 		data->status |= PICOLCD_BOOTLOADER;
545 	hid_set_drvdata(hdev, data);
546 
547 	/* Parse the device reports and start it up */
548 	error = hid_parse(hdev);
549 	if (error) {
550 		hid_err(hdev, "device report parse failed\n");
551 		goto err_cleanup_data;
552 	}
553 
554 	error = hid_hw_start(hdev, 0);
555 	if (error) {
556 		hid_err(hdev, "hardware start failed\n");
557 		goto err_cleanup_data;
558 	}
559 
560 	error = hid_hw_open(hdev);
561 	if (error) {
562 		hid_err(hdev, "failed to open input interrupt pipe for key and IR events\n");
563 		goto err_cleanup_hid_hw;
564 	}
565 
566 	error = device_create_file(&hdev->dev, &dev_attr_operation_mode_delay);
567 	if (error) {
568 		hid_err(hdev, "failed to create sysfs attributes\n");
569 		goto err_cleanup_hid_ll;
570 	}
571 
572 	error = device_create_file(&hdev->dev, &dev_attr_operation_mode);
573 	if (error) {
574 		hid_err(hdev, "failed to create sysfs attributes\n");
575 		goto err_cleanup_sysfs1;
576 	}
577 
578 	if (data->status & PICOLCD_BOOTLOADER)
579 		error = picolcd_probe_bootloader(hdev, data);
580 	else
581 		error = picolcd_probe_lcd(hdev, data);
582 	if (error)
583 		goto err_cleanup_sysfs2;
584 
585 	dbg_hid(PICOLCD_NAME " activated and initialized\n");
586 	return 0;
587 
588 err_cleanup_sysfs2:
589 	device_remove_file(&hdev->dev, &dev_attr_operation_mode);
590 err_cleanup_sysfs1:
591 	device_remove_file(&hdev->dev, &dev_attr_operation_mode_delay);
592 err_cleanup_hid_ll:
593 	hid_hw_close(hdev);
594 err_cleanup_hid_hw:
595 	hid_hw_stop(hdev);
596 err_cleanup_data:
597 	kfree(data);
598 	return error;
599 }
600 
601 static void picolcd_remove(struct hid_device *hdev)
602 {
603 	struct picolcd_data *data = hid_get_drvdata(hdev);
604 	unsigned long flags;
605 
606 	dbg_hid(PICOLCD_NAME " hardware remove...\n");
607 	spin_lock_irqsave(&data->lock, flags);
608 	data->status |= PICOLCD_FAILED;
609 	spin_unlock_irqrestore(&data->lock, flags);
610 
611 	picolcd_exit_devfs(data);
612 	device_remove_file(&hdev->dev, &dev_attr_operation_mode);
613 	device_remove_file(&hdev->dev, &dev_attr_operation_mode_delay);
614 	hid_hw_close(hdev);
615 	hid_hw_stop(hdev);
616 
617 	/* Shortcut potential pending reply that will never arrive */
618 	spin_lock_irqsave(&data->lock, flags);
619 	if (data->pending)
620 		complete(&data->pending->ready);
621 	spin_unlock_irqrestore(&data->lock, flags);
622 
623 	/* Cleanup LED */
624 	picolcd_exit_leds(data);
625 	/* Clean up the framebuffer */
626 	picolcd_exit_backlight(data);
627 	picolcd_exit_lcd(data);
628 	picolcd_exit_framebuffer(data);
629 	/* Cleanup input */
630 	picolcd_exit_cir(data);
631 	picolcd_exit_keys(data);
632 
633 	mutex_destroy(&data->mutex);
634 	/* Finally, clean up the picolcd data itself */
635 	kfree(data);
636 }
637 
638 static const struct hid_device_id picolcd_devices[] = {
639 	{ HID_USB_DEVICE(USB_VENDOR_ID_MICROCHIP, USB_DEVICE_ID_PICOLCD) },
640 	{ HID_USB_DEVICE(USB_VENDOR_ID_MICROCHIP, USB_DEVICE_ID_PICOLCD_BOOTLOADER) },
641 	{ }
642 };
643 MODULE_DEVICE_TABLE(hid, picolcd_devices);
644 
645 static struct hid_driver picolcd_driver = {
646 	.name =          "hid-picolcd",
647 	.id_table =      picolcd_devices,
648 	.probe =         picolcd_probe,
649 	.remove =        picolcd_remove,
650 	.raw_event =     picolcd_raw_event,
651 #ifdef CONFIG_PM
652 	.suspend =       picolcd_suspend,
653 	.resume =        picolcd_resume,
654 	.reset_resume =  picolcd_reset_resume,
655 #endif
656 };
657 module_hid_driver(picolcd_driver);
658 
659 MODULE_DESCRIPTION("Minibox graphics PicoLCD Driver");
660 MODULE_LICENSE("GPL v2");
661