1 /***************************************************************************
2  *   Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org>  *
3  *                                                                         *
4  *   Based on Logitech G13 driver (v0.4)                                   *
5  *     Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu>   *
6  *                                                                         *
7  *   This program is free software: you can redistribute it and/or modify  *
8  *   it under the terms of the GNU General Public License as published by  *
9  *   the Free Software Foundation, version 2 of the License.               *
10  *                                                                         *
11  *   This driver is distributed in the hope that it will be useful, but    *
12  *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *
14  *   General Public License for more details.                              *
15  *                                                                         *
16  *   You should have received a copy of the GNU General Public License     *
17  *   along with this software. If not see <http://www.gnu.org/licenses/>.  *
18  ***************************************************************************/
19 
20 #include <linux/hid.h>
21 #include <linux/hid-debug.h>
22 #include <linux/input.h>
23 #include "hid-ids.h"
24 
25 #include <linux/fb.h>
26 #include <linux/vmalloc.h>
27 
28 #include <linux/completion.h>
29 #include <linux/uaccess.h>
30 #include <linux/module.h>
31 
32 #include "hid-picolcd.h"
33 
34 
35 /* Input device
36  *
37  * The PicoLCD has an IR receiver header, a built-in keypad with 5 keys
38  * and header for 4x4 key matrix. The built-in keys are part of the matrix.
39  */
40 static const unsigned short def_keymap[PICOLCD_KEYS] = {
41 	KEY_RESERVED,	/* none */
42 	KEY_BACK,	/* col 4 + row 1 */
43 	KEY_HOMEPAGE,	/* col 3 + row 1 */
44 	KEY_RESERVED,	/* col 2 + row 1 */
45 	KEY_RESERVED,	/* col 1 + row 1 */
46 	KEY_SCROLLUP,	/* col 4 + row 2 */
47 	KEY_OK,		/* col 3 + row 2 */
48 	KEY_SCROLLDOWN,	/* col 2 + row 2 */
49 	KEY_RESERVED,	/* col 1 + row 2 */
50 	KEY_RESERVED,	/* col 4 + row 3 */
51 	KEY_RESERVED,	/* col 3 + row 3 */
52 	KEY_RESERVED,	/* col 2 + row 3 */
53 	KEY_RESERVED,	/* col 1 + row 3 */
54 	KEY_RESERVED,	/* col 4 + row 4 */
55 	KEY_RESERVED,	/* col 3 + row 4 */
56 	KEY_RESERVED,	/* col 2 + row 4 */
57 	KEY_RESERVED,	/* col 1 + row 4 */
58 };
59 
60 
61 /* Find a given report */
62 struct hid_report *picolcd_report(int id, struct hid_device *hdev, int dir)
63 {
64 	struct list_head *feature_report_list = &hdev->report_enum[dir].report_list;
65 	struct hid_report *report = NULL;
66 
67 	list_for_each_entry(report, feature_report_list, list) {
68 		if (report->id == id)
69 			return report;
70 	}
71 	hid_warn(hdev, "No report with id 0x%x found\n", id);
72 	return NULL;
73 }
74 
75 /* Submit a report and wait for a reply from device - if device fades away
76  * or does not respond in time, return NULL */
77 struct picolcd_pending *picolcd_send_and_wait(struct hid_device *hdev,
78 		int report_id, const u8 *raw_data, int size)
79 {
80 	struct picolcd_data *data = hid_get_drvdata(hdev);
81 	struct picolcd_pending *work;
82 	struct hid_report *report = picolcd_out_report(report_id, hdev);
83 	unsigned long flags;
84 	int i, j, k;
85 
86 	if (!report || !data)
87 		return NULL;
88 	if (data->status & PICOLCD_FAILED)
89 		return NULL;
90 	work = kzalloc(sizeof(*work), GFP_KERNEL);
91 	if (!work)
92 		return NULL;
93 
94 	init_completion(&work->ready);
95 	work->out_report = report;
96 	work->in_report  = NULL;
97 	work->raw_size   = 0;
98 
99 	mutex_lock(&data->mutex);
100 	spin_lock_irqsave(&data->lock, flags);
101 	for (i = k = 0; i < report->maxfield; i++)
102 		for (j = 0; j < report->field[i]->report_count; j++) {
103 			hid_set_field(report->field[i], j, k < size ? raw_data[k] : 0);
104 			k++;
105 		}
106 	if (data->status & PICOLCD_FAILED) {
107 		kfree(work);
108 		work = NULL;
109 	} else {
110 		data->pending = work;
111 		hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT);
112 		spin_unlock_irqrestore(&data->lock, flags);
113 		wait_for_completion_interruptible_timeout(&work->ready, HZ*2);
114 		spin_lock_irqsave(&data->lock, flags);
115 		data->pending = NULL;
116 	}
117 	spin_unlock_irqrestore(&data->lock, flags);
118 	mutex_unlock(&data->mutex);
119 	return work;
120 }
121 
122 /*
123  * input class device
124  */
125 static int picolcd_raw_keypad(struct picolcd_data *data,
126 		struct hid_report *report, u8 *raw_data, int size)
127 {
128 	/*
129 	 * Keypad event
130 	 * First and second data bytes list currently pressed keys,
131 	 * 0x00 means no key and at most 2 keys may be pressed at same time
132 	 */
133 	int i, j;
134 
135 	/* determine newly pressed keys */
136 	for (i = 0; i < size; i++) {
137 		unsigned int key_code;
138 		if (raw_data[i] == 0)
139 			continue;
140 		for (j = 0; j < sizeof(data->pressed_keys); j++)
141 			if (data->pressed_keys[j] == raw_data[i])
142 				goto key_already_down;
143 		for (j = 0; j < sizeof(data->pressed_keys); j++)
144 			if (data->pressed_keys[j] == 0) {
145 				data->pressed_keys[j] = raw_data[i];
146 				break;
147 			}
148 		input_event(data->input_keys, EV_MSC, MSC_SCAN, raw_data[i]);
149 		if (raw_data[i] < PICOLCD_KEYS)
150 			key_code = data->keycode[raw_data[i]];
151 		else
152 			key_code = KEY_UNKNOWN;
153 		if (key_code != KEY_UNKNOWN) {
154 			dbg_hid(PICOLCD_NAME " got key press for %u:%d",
155 					raw_data[i], key_code);
156 			input_report_key(data->input_keys, key_code, 1);
157 		}
158 		input_sync(data->input_keys);
159 key_already_down:
160 		continue;
161 	}
162 
163 	/* determine newly released keys */
164 	for (j = 0; j < sizeof(data->pressed_keys); j++) {
165 		unsigned int key_code;
166 		if (data->pressed_keys[j] == 0)
167 			continue;
168 		for (i = 0; i < size; i++)
169 			if (data->pressed_keys[j] == raw_data[i])
170 				goto key_still_down;
171 		input_event(data->input_keys, EV_MSC, MSC_SCAN, data->pressed_keys[j]);
172 		if (data->pressed_keys[j] < PICOLCD_KEYS)
173 			key_code = data->keycode[data->pressed_keys[j]];
174 		else
175 			key_code = KEY_UNKNOWN;
176 		if (key_code != KEY_UNKNOWN) {
177 			dbg_hid(PICOLCD_NAME " got key release for %u:%d",
178 					data->pressed_keys[j], key_code);
179 			input_report_key(data->input_keys, key_code, 0);
180 		}
181 		input_sync(data->input_keys);
182 		data->pressed_keys[j] = 0;
183 key_still_down:
184 		continue;
185 	}
186 	return 1;
187 }
188 
189 static int picolcd_check_version(struct hid_device *hdev)
190 {
191 	struct picolcd_data *data = hid_get_drvdata(hdev);
192 	struct picolcd_pending *verinfo;
193 	int ret = 0;
194 
195 	if (!data)
196 		return -ENODEV;
197 
198 	verinfo = picolcd_send_and_wait(hdev, REPORT_VERSION, NULL, 0);
199 	if (!verinfo) {
200 		hid_err(hdev, "no version response from PicoLCD\n");
201 		return -ENODEV;
202 	}
203 
204 	if (verinfo->raw_size == 2) {
205 		data->version[0] = verinfo->raw_data[1];
206 		data->version[1] = verinfo->raw_data[0];
207 		if (data->status & PICOLCD_BOOTLOADER) {
208 			hid_info(hdev, "PicoLCD, bootloader version %d.%d\n",
209 				 verinfo->raw_data[1], verinfo->raw_data[0]);
210 		} else {
211 			hid_info(hdev, "PicoLCD, firmware version %d.%d\n",
212 				 verinfo->raw_data[1], verinfo->raw_data[0]);
213 		}
214 	} else {
215 		hid_err(hdev, "confused, got unexpected version response from PicoLCD\n");
216 		ret = -EINVAL;
217 	}
218 	kfree(verinfo);
219 	return ret;
220 }
221 
222 /*
223  * Reset our device and wait for answer to VERSION request
224  */
225 int picolcd_reset(struct hid_device *hdev)
226 {
227 	struct picolcd_data *data = hid_get_drvdata(hdev);
228 	struct hid_report *report = picolcd_out_report(REPORT_RESET, hdev);
229 	unsigned long flags;
230 	int error;
231 
232 	if (!data || !report || report->maxfield != 1)
233 		return -ENODEV;
234 
235 	spin_lock_irqsave(&data->lock, flags);
236 	if (hdev->product == USB_DEVICE_ID_PICOLCD_BOOTLOADER)
237 		data->status |= PICOLCD_BOOTLOADER;
238 
239 	/* perform the reset */
240 	hid_set_field(report->field[0], 0, 1);
241 	if (data->status & PICOLCD_FAILED) {
242 		spin_unlock_irqrestore(&data->lock, flags);
243 		return -ENODEV;
244 	}
245 	hid_hw_request(hdev, report, HID_REQ_SET_REPORT);
246 	spin_unlock_irqrestore(&data->lock, flags);
247 
248 	error = picolcd_check_version(hdev);
249 	if (error)
250 		return error;
251 
252 	picolcd_resume_lcd(data);
253 	picolcd_resume_backlight(data);
254 	picolcd_fb_refresh(data);
255 	picolcd_leds_set(data);
256 	return 0;
257 }
258 
259 /*
260  * The "operation_mode" sysfs attribute
261  */
262 static ssize_t picolcd_operation_mode_show(struct device *dev,
263 		struct device_attribute *attr, char *buf)
264 {
265 	struct picolcd_data *data = dev_get_drvdata(dev);
266 
267 	if (data->status & PICOLCD_BOOTLOADER)
268 		return snprintf(buf, PAGE_SIZE, "[bootloader] lcd\n");
269 	else
270 		return snprintf(buf, PAGE_SIZE, "bootloader [lcd]\n");
271 }
272 
273 static ssize_t picolcd_operation_mode_store(struct device *dev,
274 		struct device_attribute *attr, const char *buf, size_t count)
275 {
276 	struct picolcd_data *data = dev_get_drvdata(dev);
277 	struct hid_report *report = NULL;
278 	size_t cnt = count;
279 	int timeout = data->opmode_delay;
280 	unsigned long flags;
281 
282 	if (cnt >= 3 && strncmp("lcd", buf, 3) == 0) {
283 		if (data->status & PICOLCD_BOOTLOADER)
284 			report = picolcd_out_report(REPORT_EXIT_FLASHER, data->hdev);
285 		buf += 3;
286 		cnt -= 3;
287 	} else if (cnt >= 10 && strncmp("bootloader", buf, 10) == 0) {
288 		if (!(data->status & PICOLCD_BOOTLOADER))
289 			report = picolcd_out_report(REPORT_EXIT_KEYBOARD, data->hdev);
290 		buf += 10;
291 		cnt -= 10;
292 	}
293 	if (!report)
294 		return -EINVAL;
295 
296 	while (cnt > 0 && (buf[cnt-1] == '\n' || buf[cnt-1] == '\r'))
297 		cnt--;
298 	if (cnt != 0)
299 		return -EINVAL;
300 
301 	spin_lock_irqsave(&data->lock, flags);
302 	hid_set_field(report->field[0], 0, timeout & 0xff);
303 	hid_set_field(report->field[0], 1, (timeout >> 8) & 0xff);
304 	hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT);
305 	spin_unlock_irqrestore(&data->lock, flags);
306 	return count;
307 }
308 
309 static DEVICE_ATTR(operation_mode, 0644, picolcd_operation_mode_show,
310 		picolcd_operation_mode_store);
311 
312 /*
313  * The "operation_mode_delay" sysfs attribute
314  */
315 static ssize_t picolcd_operation_mode_delay_show(struct device *dev,
316 		struct device_attribute *attr, char *buf)
317 {
318 	struct picolcd_data *data = dev_get_drvdata(dev);
319 
320 	return snprintf(buf, PAGE_SIZE, "%hu\n", data->opmode_delay);
321 }
322 
323 static ssize_t picolcd_operation_mode_delay_store(struct device *dev,
324 		struct device_attribute *attr, const char *buf, size_t count)
325 {
326 	struct picolcd_data *data = dev_get_drvdata(dev);
327 	unsigned u;
328 	if (sscanf(buf, "%u", &u) != 1)
329 		return -EINVAL;
330 	if (u > 30000)
331 		return -EINVAL;
332 	else
333 		data->opmode_delay = u;
334 	return count;
335 }
336 
337 static DEVICE_ATTR(operation_mode_delay, 0644, picolcd_operation_mode_delay_show,
338 		picolcd_operation_mode_delay_store);
339 
340 /*
341  * Handle raw report as sent by device
342  */
343 static int picolcd_raw_event(struct hid_device *hdev,
344 		struct hid_report *report, u8 *raw_data, int size)
345 {
346 	struct picolcd_data *data = hid_get_drvdata(hdev);
347 	unsigned long flags;
348 	int ret = 0;
349 
350 	if (!data)
351 		return 1;
352 
353 	if (report->id == REPORT_KEY_STATE) {
354 		if (data->input_keys)
355 			ret = picolcd_raw_keypad(data, report, raw_data+1, size-1);
356 	} else if (report->id == REPORT_IR_DATA) {
357 		ret = picolcd_raw_cir(data, report, raw_data+1, size-1);
358 	} else {
359 		spin_lock_irqsave(&data->lock, flags);
360 		/*
361 		 * We let the caller of picolcd_send_and_wait() check if the
362 		 * report we got is one of the expected ones or not.
363 		 */
364 		if (data->pending) {
365 			memcpy(data->pending->raw_data, raw_data+1, size-1);
366 			data->pending->raw_size  = size-1;
367 			data->pending->in_report = report;
368 			complete(&data->pending->ready);
369 		}
370 		spin_unlock_irqrestore(&data->lock, flags);
371 	}
372 
373 	picolcd_debug_raw_event(data, hdev, report, raw_data, size);
374 	return 1;
375 }
376 
377 #ifdef CONFIG_PM
378 static int picolcd_suspend(struct hid_device *hdev, pm_message_t message)
379 {
380 	if (PMSG_IS_AUTO(message))
381 		return 0;
382 
383 	picolcd_suspend_backlight(hid_get_drvdata(hdev));
384 	dbg_hid(PICOLCD_NAME " device ready for suspend\n");
385 	return 0;
386 }
387 
388 static int picolcd_resume(struct hid_device *hdev)
389 {
390 	int ret;
391 	ret = picolcd_resume_backlight(hid_get_drvdata(hdev));
392 	if (ret)
393 		dbg_hid(PICOLCD_NAME " restoring backlight failed: %d\n", ret);
394 	return 0;
395 }
396 
397 static int picolcd_reset_resume(struct hid_device *hdev)
398 {
399 	int ret;
400 	ret = picolcd_reset(hdev);
401 	if (ret)
402 		dbg_hid(PICOLCD_NAME " resetting our device failed: %d\n", ret);
403 	ret = picolcd_fb_reset(hid_get_drvdata(hdev), 0);
404 	if (ret)
405 		dbg_hid(PICOLCD_NAME " restoring framebuffer content failed: %d\n", ret);
406 	ret = picolcd_resume_lcd(hid_get_drvdata(hdev));
407 	if (ret)
408 		dbg_hid(PICOLCD_NAME " restoring lcd failed: %d\n", ret);
409 	ret = picolcd_resume_backlight(hid_get_drvdata(hdev));
410 	if (ret)
411 		dbg_hid(PICOLCD_NAME " restoring backlight failed: %d\n", ret);
412 	picolcd_leds_set(hid_get_drvdata(hdev));
413 	return 0;
414 }
415 #endif
416 
417 /* initialize keypad input device */
418 static int picolcd_init_keys(struct picolcd_data *data,
419 		struct hid_report *report)
420 {
421 	struct hid_device *hdev = data->hdev;
422 	struct input_dev *idev;
423 	int error, i;
424 
425 	if (!report)
426 		return -ENODEV;
427 	if (report->maxfield != 1 || report->field[0]->report_count != 2 ||
428 			report->field[0]->report_size != 8) {
429 		hid_err(hdev, "unsupported KEY_STATE report\n");
430 		return -EINVAL;
431 	}
432 
433 	idev = input_allocate_device();
434 	if (idev == NULL) {
435 		hid_err(hdev, "failed to allocate input device\n");
436 		return -ENOMEM;
437 	}
438 	input_set_drvdata(idev, hdev);
439 	memcpy(data->keycode, def_keymap, sizeof(def_keymap));
440 	idev->name = hdev->name;
441 	idev->phys = hdev->phys;
442 	idev->uniq = hdev->uniq;
443 	idev->id.bustype = hdev->bus;
444 	idev->id.vendor  = hdev->vendor;
445 	idev->id.product = hdev->product;
446 	idev->id.version = hdev->version;
447 	idev->dev.parent = &hdev->dev;
448 	idev->keycode     = &data->keycode;
449 	idev->keycodemax  = PICOLCD_KEYS;
450 	idev->keycodesize = sizeof(data->keycode[0]);
451 	input_set_capability(idev, EV_MSC, MSC_SCAN);
452 	set_bit(EV_REP, idev->evbit);
453 	for (i = 0; i < PICOLCD_KEYS; i++)
454 		input_set_capability(idev, EV_KEY, data->keycode[i]);
455 	error = input_register_device(idev);
456 	if (error) {
457 		hid_err(hdev, "error registering the input device\n");
458 		input_free_device(idev);
459 		return error;
460 	}
461 	data->input_keys = idev;
462 	return 0;
463 }
464 
465 static void picolcd_exit_keys(struct picolcd_data *data)
466 {
467 	struct input_dev *idev = data->input_keys;
468 
469 	data->input_keys = NULL;
470 	if (idev)
471 		input_unregister_device(idev);
472 }
473 
474 static int picolcd_probe_lcd(struct hid_device *hdev, struct picolcd_data *data)
475 {
476 	int error;
477 
478 	/* Setup keypad input device */
479 	error = picolcd_init_keys(data, picolcd_in_report(REPORT_KEY_STATE, hdev));
480 	if (error)
481 		goto err;
482 
483 	/* Setup CIR input device */
484 	error = picolcd_init_cir(data, picolcd_in_report(REPORT_IR_DATA, hdev));
485 	if (error)
486 		goto err;
487 
488 	/* Set up the framebuffer device */
489 	error = picolcd_init_framebuffer(data);
490 	if (error)
491 		goto err;
492 
493 	/* Setup lcd class device */
494 	error = picolcd_init_lcd(data, picolcd_out_report(REPORT_CONTRAST, hdev));
495 	if (error)
496 		goto err;
497 
498 	/* Setup backlight class device */
499 	error = picolcd_init_backlight(data, picolcd_out_report(REPORT_BRIGHTNESS, hdev));
500 	if (error)
501 		goto err;
502 
503 	/* Setup the LED class devices */
504 	error = picolcd_init_leds(data, picolcd_out_report(REPORT_LED_STATE, hdev));
505 	if (error)
506 		goto err;
507 
508 	picolcd_init_devfs(data, picolcd_out_report(REPORT_EE_READ, hdev),
509 			picolcd_out_report(REPORT_EE_WRITE, hdev),
510 			picolcd_out_report(REPORT_READ_MEMORY, hdev),
511 			picolcd_out_report(REPORT_WRITE_MEMORY, hdev),
512 			picolcd_out_report(REPORT_RESET, hdev));
513 	return 0;
514 err:
515 	picolcd_exit_leds(data);
516 	picolcd_exit_backlight(data);
517 	picolcd_exit_lcd(data);
518 	picolcd_exit_framebuffer(data);
519 	picolcd_exit_cir(data);
520 	picolcd_exit_keys(data);
521 	return error;
522 }
523 
524 static int picolcd_probe_bootloader(struct hid_device *hdev, struct picolcd_data *data)
525 {
526 	picolcd_init_devfs(data, NULL, NULL,
527 			picolcd_out_report(REPORT_BL_READ_MEMORY, hdev),
528 			picolcd_out_report(REPORT_BL_WRITE_MEMORY, hdev), NULL);
529 	return 0;
530 }
531 
532 static int picolcd_probe(struct hid_device *hdev,
533 		     const struct hid_device_id *id)
534 {
535 	struct picolcd_data *data;
536 	int error = -ENOMEM;
537 
538 	dbg_hid(PICOLCD_NAME " hardware probe...\n");
539 
540 	/*
541 	 * Let's allocate the picolcd data structure, set some reasonable
542 	 * defaults, and associate it with the device
543 	 */
544 	data = kzalloc(sizeof(struct picolcd_data), GFP_KERNEL);
545 	if (data == NULL) {
546 		hid_err(hdev, "can't allocate space for Minibox PicoLCD device data\n");
547 		error = -ENOMEM;
548 		goto err_no_cleanup;
549 	}
550 
551 	spin_lock_init(&data->lock);
552 	mutex_init(&data->mutex);
553 	data->hdev = hdev;
554 	data->opmode_delay = 5000;
555 	if (hdev->product == USB_DEVICE_ID_PICOLCD_BOOTLOADER)
556 		data->status |= PICOLCD_BOOTLOADER;
557 	hid_set_drvdata(hdev, data);
558 
559 	/* Parse the device reports and start it up */
560 	error = hid_parse(hdev);
561 	if (error) {
562 		hid_err(hdev, "device report parse failed\n");
563 		goto err_cleanup_data;
564 	}
565 
566 	error = hid_hw_start(hdev, 0);
567 	if (error) {
568 		hid_err(hdev, "hardware start failed\n");
569 		goto err_cleanup_data;
570 	}
571 
572 	error = hid_hw_open(hdev);
573 	if (error) {
574 		hid_err(hdev, "failed to open input interrupt pipe for key and IR events\n");
575 		goto err_cleanup_hid_hw;
576 	}
577 
578 	error = device_create_file(&hdev->dev, &dev_attr_operation_mode_delay);
579 	if (error) {
580 		hid_err(hdev, "failed to create sysfs attributes\n");
581 		goto err_cleanup_hid_ll;
582 	}
583 
584 	error = device_create_file(&hdev->dev, &dev_attr_operation_mode);
585 	if (error) {
586 		hid_err(hdev, "failed to create sysfs attributes\n");
587 		goto err_cleanup_sysfs1;
588 	}
589 
590 	if (data->status & PICOLCD_BOOTLOADER)
591 		error = picolcd_probe_bootloader(hdev, data);
592 	else
593 		error = picolcd_probe_lcd(hdev, data);
594 	if (error)
595 		goto err_cleanup_sysfs2;
596 
597 	dbg_hid(PICOLCD_NAME " activated and initialized\n");
598 	return 0;
599 
600 err_cleanup_sysfs2:
601 	device_remove_file(&hdev->dev, &dev_attr_operation_mode);
602 err_cleanup_sysfs1:
603 	device_remove_file(&hdev->dev, &dev_attr_operation_mode_delay);
604 err_cleanup_hid_ll:
605 	hid_hw_close(hdev);
606 err_cleanup_hid_hw:
607 	hid_hw_stop(hdev);
608 err_cleanup_data:
609 	kfree(data);
610 err_no_cleanup:
611 	hid_set_drvdata(hdev, NULL);
612 
613 	return error;
614 }
615 
616 static void picolcd_remove(struct hid_device *hdev)
617 {
618 	struct picolcd_data *data = hid_get_drvdata(hdev);
619 	unsigned long flags;
620 
621 	dbg_hid(PICOLCD_NAME " hardware remove...\n");
622 	spin_lock_irqsave(&data->lock, flags);
623 	data->status |= PICOLCD_FAILED;
624 	spin_unlock_irqrestore(&data->lock, flags);
625 
626 	picolcd_exit_devfs(data);
627 	device_remove_file(&hdev->dev, &dev_attr_operation_mode);
628 	device_remove_file(&hdev->dev, &dev_attr_operation_mode_delay);
629 	hid_hw_close(hdev);
630 	hid_hw_stop(hdev);
631 
632 	/* Shortcut potential pending reply that will never arrive */
633 	spin_lock_irqsave(&data->lock, flags);
634 	if (data->pending)
635 		complete(&data->pending->ready);
636 	spin_unlock_irqrestore(&data->lock, flags);
637 
638 	/* Cleanup LED */
639 	picolcd_exit_leds(data);
640 	/* Clean up the framebuffer */
641 	picolcd_exit_backlight(data);
642 	picolcd_exit_lcd(data);
643 	picolcd_exit_framebuffer(data);
644 	/* Cleanup input */
645 	picolcd_exit_cir(data);
646 	picolcd_exit_keys(data);
647 
648 	hid_set_drvdata(hdev, NULL);
649 	mutex_destroy(&data->mutex);
650 	/* Finally, clean up the picolcd data itself */
651 	kfree(data);
652 }
653 
654 static const struct hid_device_id picolcd_devices[] = {
655 	{ HID_USB_DEVICE(USB_VENDOR_ID_MICROCHIP, USB_DEVICE_ID_PICOLCD) },
656 	{ HID_USB_DEVICE(USB_VENDOR_ID_MICROCHIP, USB_DEVICE_ID_PICOLCD_BOOTLOADER) },
657 	{ }
658 };
659 MODULE_DEVICE_TABLE(hid, picolcd_devices);
660 
661 static struct hid_driver picolcd_driver = {
662 	.name =          "hid-picolcd",
663 	.id_table =      picolcd_devices,
664 	.probe =         picolcd_probe,
665 	.remove =        picolcd_remove,
666 	.raw_event =     picolcd_raw_event,
667 #ifdef CONFIG_PM
668 	.suspend =       picolcd_suspend,
669 	.resume =        picolcd_resume,
670 	.reset_resume =  picolcd_reset_resume,
671 #endif
672 };
673 module_hid_driver(picolcd_driver);
674 
675 MODULE_DESCRIPTION("Minibox graphics PicoLCD Driver");
676 MODULE_LICENSE("GPL v2");
677