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Linux/drivers/input/touchscreen/wacom_w8001.c

  1 /*
  2  * Wacom W8001 penabled serial touchscreen driver
  3  *
  4  * Copyright (c) 2008 Jaya Kumar
  5  * Copyright (c) 2010 Red Hat, Inc.
  6  * Copyright (c) 2010 - 2011 Ping Cheng, Wacom. <pingc@wacom.com>
  7  *
  8  * This file is subject to the terms and conditions of the GNU General Public
  9  * License. See the file COPYING in the main directory of this archive for
 10  * more details.
 11  *
 12  * Layout based on Elo serial touchscreen driver by Vojtech Pavlik
 13  */
 14 
 15 #include <linux/errno.h>
 16 #include <linux/kernel.h>
 17 #include <linux/module.h>
 18 #include <linux/slab.h>
 19 #include <linux/input/mt.h>
 20 #include <linux/serio.h>
 21 #include <linux/ctype.h>
 22 #include <linux/delay.h>
 23 
 24 #define DRIVER_DESC     "Wacom W8001 serial touchscreen driver"
 25 
 26 MODULE_AUTHOR("Jaya Kumar <jayakumar.lkml@gmail.com>");
 27 MODULE_DESCRIPTION(DRIVER_DESC);
 28 MODULE_LICENSE("GPL");
 29 
 30 #define W8001_MAX_LENGTH        13
 31 #define W8001_LEAD_MASK         0x80
 32 #define W8001_LEAD_BYTE         0x80
 33 #define W8001_TAB_MASK          0x40
 34 #define W8001_TAB_BYTE          0x40
 35 /* set in first byte of touch data packets */
 36 #define W8001_TOUCH_MASK        (0x10 | W8001_LEAD_MASK)
 37 #define W8001_TOUCH_BYTE        (0x10 | W8001_LEAD_BYTE)
 38 
 39 #define W8001_QUERY_PACKET      0x20
 40 
 41 #define W8001_CMD_STOP          ''
 42 #define W8001_CMD_START         '1'
 43 #define W8001_CMD_QUERY         '*'
 44 #define W8001_CMD_TOUCHQUERY    '%'
 45 
 46 /* length of data packets in bytes, depends on device. */
 47 #define W8001_PKTLEN_TOUCH93    5
 48 #define W8001_PKTLEN_TOUCH9A    7
 49 #define W8001_PKTLEN_TPCPEN     9
 50 #define W8001_PKTLEN_TPCCTL     11      /* control packet */
 51 #define W8001_PKTLEN_TOUCH2FG   13
 52 
 53 /* resolution in points/mm */
 54 #define W8001_PEN_RESOLUTION    100
 55 #define W8001_TOUCH_RESOLUTION  10
 56 
 57 struct w8001_coord {
 58         u8 rdy;
 59         u8 tsw;
 60         u8 f1;
 61         u8 f2;
 62         u16 x;
 63         u16 y;
 64         u16 pen_pressure;
 65         u8 tilt_x;
 66         u8 tilt_y;
 67 };
 68 
 69 /* touch query reply packet */
 70 struct w8001_touch_query {
 71         u16 x;
 72         u16 y;
 73         u8 panel_res;
 74         u8 capacity_res;
 75         u8 sensor_id;
 76 };
 77 
 78 /*
 79  * Per-touchscreen data.
 80  */
 81 
 82 struct w8001 {
 83         struct input_dev *pen_dev;
 84         struct input_dev *touch_dev;
 85         struct serio *serio;
 86         struct completion cmd_done;
 87         int id;
 88         int idx;
 89         unsigned char response_type;
 90         unsigned char response[W8001_MAX_LENGTH];
 91         unsigned char data[W8001_MAX_LENGTH];
 92         char phys[32];
 93         int type;
 94         unsigned int pktlen;
 95         u16 max_touch_x;
 96         u16 max_touch_y;
 97         u16 max_pen_x;
 98         u16 max_pen_y;
 99         char pen_name[64];
100         char touch_name[64];
101         int open_count;
102         struct mutex mutex;
103 };
104 
105 static void parse_pen_data(u8 *data, struct w8001_coord *coord)
106 {
107         memset(coord, 0, sizeof(*coord));
108 
109         coord->rdy = data[0] & 0x20;
110         coord->tsw = data[0] & 0x01;
111         coord->f1 = data[0] & 0x02;
112         coord->f2 = data[0] & 0x04;
113 
114         coord->x = (data[1] & 0x7F) << 9;
115         coord->x |= (data[2] & 0x7F) << 2;
116         coord->x |= (data[6] & 0x60) >> 5;
117 
118         coord->y = (data[3] & 0x7F) << 9;
119         coord->y |= (data[4] & 0x7F) << 2;
120         coord->y |= (data[6] & 0x18) >> 3;
121 
122         coord->pen_pressure = data[5] & 0x7F;
123         coord->pen_pressure |= (data[6] & 0x07) << 7 ;
124 
125         coord->tilt_x = data[7] & 0x7F;
126         coord->tilt_y = data[8] & 0x7F;
127 }
128 
129 static void parse_single_touch(u8 *data, struct w8001_coord *coord)
130 {
131         coord->x = (data[1] << 7) | data[2];
132         coord->y = (data[3] << 7) | data[4];
133         coord->tsw = data[0] & 0x01;
134 }
135 
136 static void scale_touch_coordinates(struct w8001 *w8001,
137                                     unsigned int *x, unsigned int *y)
138 {
139         if (w8001->max_pen_x && w8001->max_touch_x)
140                 *x = *x * w8001->max_pen_x / w8001->max_touch_x;
141 
142         if (w8001->max_pen_y && w8001->max_touch_y)
143                 *y = *y * w8001->max_pen_y / w8001->max_touch_y;
144 }
145 
146 static void parse_multi_touch(struct w8001 *w8001)
147 {
148         struct input_dev *dev = w8001->touch_dev;
149         unsigned char *data = w8001->data;
150         unsigned int x, y;
151         int i;
152         int count = 0;
153 
154         for (i = 0; i < 2; i++) {
155                 bool touch = data[0] & (1 << i);
156 
157                 input_mt_slot(dev, i);
158                 input_mt_report_slot_state(dev, MT_TOOL_FINGER, touch);
159                 if (touch) {
160                         x = (data[6 * i + 1] << 7) | data[6 * i + 2];
161                         y = (data[6 * i + 3] << 7) | data[6 * i + 4];
162                         /* data[5,6] and [11,12] is finger capacity */
163 
164                         /* scale to pen maximum */
165                         scale_touch_coordinates(w8001, &x, &y);
166 
167                         input_report_abs(dev, ABS_MT_POSITION_X, x);
168                         input_report_abs(dev, ABS_MT_POSITION_Y, y);
169                         count++;
170                 }
171         }
172 
173         /* emulate single touch events when stylus is out of proximity.
174          * This is to make single touch backward support consistent
175          * across all Wacom single touch devices.
176          */
177         if (w8001->type != BTN_TOOL_PEN &&
178                             w8001->type != BTN_TOOL_RUBBER) {
179                 w8001->type = count == 1 ? BTN_TOOL_FINGER : KEY_RESERVED;
180                 input_mt_report_pointer_emulation(dev, true);
181         }
182 
183         input_sync(dev);
184 }
185 
186 static void parse_touchquery(u8 *data, struct w8001_touch_query *query)
187 {
188         memset(query, 0, sizeof(*query));
189 
190         query->panel_res = data[1];
191         query->sensor_id = data[2] & 0x7;
192         query->capacity_res = data[7];
193 
194         query->x = data[3] << 9;
195         query->x |= data[4] << 2;
196         query->x |= (data[2] >> 5) & 0x3;
197 
198         query->y = data[5] << 9;
199         query->y |= data[6] << 2;
200         query->y |= (data[2] >> 3) & 0x3;
201 
202         /* Early days' single-finger touch models need the following defaults */
203         if (!query->x && !query->y) {
204                 query->x = 1024;
205                 query->y = 1024;
206                 if (query->panel_res)
207                         query->x = query->y = (1 << query->panel_res);
208                 query->panel_res = W8001_TOUCH_RESOLUTION;
209         }
210 }
211 
212 static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord)
213 {
214         struct input_dev *dev = w8001->pen_dev;
215 
216         /*
217          * We have 1 bit for proximity (rdy) and 3 bits for tip, side,
218          * side2/eraser. If rdy && f2 are set, this can be either pen + side2,
219          * or eraser. Assume:
220          * - if dev is already in proximity and f2 is toggled → pen + side2
221          * - if dev comes into proximity with f2 set → eraser
222          * If f2 disappears after assuming eraser, fake proximity out for
223          * eraser and in for pen.
224          */
225 
226         switch (w8001->type) {
227         case BTN_TOOL_RUBBER:
228                 if (!coord->f2) {
229                         input_report_abs(dev, ABS_PRESSURE, 0);
230                         input_report_key(dev, BTN_TOUCH, 0);
231                         input_report_key(dev, BTN_STYLUS, 0);
232                         input_report_key(dev, BTN_STYLUS2, 0);
233                         input_report_key(dev, BTN_TOOL_RUBBER, 0);
234                         input_sync(dev);
235                         w8001->type = BTN_TOOL_PEN;
236                 }
237                 break;
238 
239         case BTN_TOOL_FINGER:
240         case KEY_RESERVED:
241                 w8001->type = coord->f2 ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
242                 break;
243 
244         default:
245                 input_report_key(dev, BTN_STYLUS2, coord->f2);
246                 break;
247         }
248 
249         input_report_abs(dev, ABS_X, coord->x);
250         input_report_abs(dev, ABS_Y, coord->y);
251         input_report_abs(dev, ABS_PRESSURE, coord->pen_pressure);
252         input_report_key(dev, BTN_TOUCH, coord->tsw);
253         input_report_key(dev, BTN_STYLUS, coord->f1);
254         input_report_key(dev, w8001->type, coord->rdy);
255         input_sync(dev);
256 
257         if (!coord->rdy)
258                 w8001->type = KEY_RESERVED;
259 }
260 
261 static void report_single_touch(struct w8001 *w8001, struct w8001_coord *coord)
262 {
263         struct input_dev *dev = w8001->touch_dev;
264         unsigned int x = coord->x;
265         unsigned int y = coord->y;
266 
267         /* scale to pen maximum */
268         scale_touch_coordinates(w8001, &x, &y);
269 
270         input_report_abs(dev, ABS_X, x);
271         input_report_abs(dev, ABS_Y, y);
272         input_report_key(dev, BTN_TOUCH, coord->tsw);
273 
274         input_sync(dev);
275 
276         w8001->type = coord->tsw ? BTN_TOOL_FINGER : KEY_RESERVED;
277 }
278 
279 static irqreturn_t w8001_interrupt(struct serio *serio,
280                                    unsigned char data, unsigned int flags)
281 {
282         struct w8001 *w8001 = serio_get_drvdata(serio);
283         struct w8001_coord coord;
284         unsigned char tmp;
285 
286         w8001->data[w8001->idx] = data;
287         switch (w8001->idx++) {
288         case 0:
289                 if ((data & W8001_LEAD_MASK) != W8001_LEAD_BYTE) {
290                         pr_debug("w8001: unsynchronized data: 0x%02x\n", data);
291                         w8001->idx = 0;
292                 }
293                 break;
294 
295         case W8001_PKTLEN_TOUCH93 - 1:
296         case W8001_PKTLEN_TOUCH9A - 1:
297                 tmp = w8001->data[0] & W8001_TOUCH_BYTE;
298                 if (tmp != W8001_TOUCH_BYTE)
299                         break;
300 
301                 if (w8001->pktlen == w8001->idx) {
302                         w8001->idx = 0;
303                         if (w8001->type != BTN_TOOL_PEN &&
304                             w8001->type != BTN_TOOL_RUBBER) {
305                                 parse_single_touch(w8001->data, &coord);
306                                 report_single_touch(w8001, &coord);
307                         }
308                 }
309                 break;
310 
311         /* Pen coordinates packet */
312         case W8001_PKTLEN_TPCPEN - 1:
313                 tmp = w8001->data[0] & W8001_TAB_MASK;
314                 if (unlikely(tmp == W8001_TAB_BYTE))
315                         break;
316 
317                 tmp = w8001->data[0] & W8001_TOUCH_BYTE;
318                 if (tmp == W8001_TOUCH_BYTE)
319                         break;
320 
321                 w8001->idx = 0;
322                 parse_pen_data(w8001->data, &coord);
323                 report_pen_events(w8001, &coord);
324                 break;
325 
326         /* control packet */
327         case W8001_PKTLEN_TPCCTL - 1:
328                 tmp = w8001->data[0] & W8001_TOUCH_MASK;
329                 if (tmp == W8001_TOUCH_BYTE)
330                         break;
331 
332                 w8001->idx = 0;
333                 memcpy(w8001->response, w8001->data, W8001_MAX_LENGTH);
334                 w8001->response_type = W8001_QUERY_PACKET;
335                 complete(&w8001->cmd_done);
336                 break;
337 
338         /* 2 finger touch packet */
339         case W8001_PKTLEN_TOUCH2FG - 1:
340                 w8001->idx = 0;
341                 parse_multi_touch(w8001);
342                 break;
343 
344         default:
345                 /*
346                  * ThinkPad X60 Tablet PC (pen only device) sometimes
347                  * sends invalid data packets that are larger than
348                  * W8001_PKTLEN_TPCPEN. Let's start over again.
349                  */
350                 if (!w8001->touch_dev && w8001->idx > W8001_PKTLEN_TPCPEN - 1)
351                         w8001->idx = 0;
352         }
353 
354         return IRQ_HANDLED;
355 }
356 
357 static int w8001_command(struct w8001 *w8001, unsigned char command,
358                          bool wait_response)
359 {
360         int rc;
361 
362         w8001->response_type = 0;
363         init_completion(&w8001->cmd_done);
364 
365         rc = serio_write(w8001->serio, command);
366         if (rc == 0 && wait_response) {
367 
368                 wait_for_completion_timeout(&w8001->cmd_done, HZ);
369                 if (w8001->response_type != W8001_QUERY_PACKET)
370                         rc = -EIO;
371         }
372 
373         return rc;
374 }
375 
376 static int w8001_open(struct input_dev *dev)
377 {
378         struct w8001 *w8001 = input_get_drvdata(dev);
379         int err;
380 
381         err = mutex_lock_interruptible(&w8001->mutex);
382         if (err)
383                 return err;
384 
385         if (w8001->open_count++ == 0) {
386                 err = w8001_command(w8001, W8001_CMD_START, false);
387                 if (err)
388                         w8001->open_count--;
389         }
390 
391         mutex_unlock(&w8001->mutex);
392         return err;
393 }
394 
395 static void w8001_close(struct input_dev *dev)
396 {
397         struct w8001 *w8001 = input_get_drvdata(dev);
398 
399         mutex_lock(&w8001->mutex);
400 
401         if (--w8001->open_count == 0)
402                 w8001_command(w8001, W8001_CMD_STOP, false);
403 
404         mutex_unlock(&w8001->mutex);
405 }
406 
407 static int w8001_detect(struct w8001 *w8001)
408 {
409         int error;
410 
411         error = w8001_command(w8001, W8001_CMD_STOP, false);
412         if (error)
413                 return error;
414 
415         msleep(250);    /* wait 250ms before querying the device */
416 
417         return 0;
418 }
419 
420 static int w8001_setup_pen(struct w8001 *w8001, char *basename,
421                            size_t basename_sz)
422 {
423         struct input_dev *dev = w8001->pen_dev;
424         struct w8001_coord coord;
425         int error;
426 
427         /* penabled? */
428         error = w8001_command(w8001, W8001_CMD_QUERY, true);
429         if (error)
430                 return error;
431 
432         __set_bit(EV_KEY, dev->evbit);
433         __set_bit(EV_ABS, dev->evbit);
434         __set_bit(BTN_TOUCH, dev->keybit);
435         __set_bit(BTN_TOOL_PEN, dev->keybit);
436         __set_bit(BTN_TOOL_RUBBER, dev->keybit);
437         __set_bit(BTN_STYLUS, dev->keybit);
438         __set_bit(BTN_STYLUS2, dev->keybit);
439         __set_bit(INPUT_PROP_DIRECT, dev->propbit);
440 
441         parse_pen_data(w8001->response, &coord);
442         w8001->max_pen_x = coord.x;
443         w8001->max_pen_y = coord.y;
444 
445         input_set_abs_params(dev, ABS_X, 0, coord.x, 0, 0);
446         input_set_abs_params(dev, ABS_Y, 0, coord.y, 0, 0);
447         input_abs_set_res(dev, ABS_X, W8001_PEN_RESOLUTION);
448         input_abs_set_res(dev, ABS_Y, W8001_PEN_RESOLUTION);
449         input_set_abs_params(dev, ABS_PRESSURE, 0, coord.pen_pressure, 0, 0);
450         if (coord.tilt_x && coord.tilt_y) {
451                 input_set_abs_params(dev, ABS_TILT_X, 0, coord.tilt_x, 0, 0);
452                 input_set_abs_params(dev, ABS_TILT_Y, 0, coord.tilt_y, 0, 0);
453         }
454 
455         w8001->id = 0x90;
456         strlcat(basename, " Penabled", basename_sz);
457 
458         return 0;
459 }
460 
461 static int w8001_setup_touch(struct w8001 *w8001, char *basename,
462                              size_t basename_sz)
463 {
464         struct input_dev *dev = w8001->touch_dev;
465         struct w8001_touch_query touch;
466         int error;
467 
468 
469         /* Touch enabled? */
470         error = w8001_command(w8001, W8001_CMD_TOUCHQUERY, true);
471         if (error)
472                 return error;
473         /*
474          * Some non-touch devices may reply to the touch query. But their
475          * second byte is empty, which indicates touch is not supported.
476          */
477         if (!w8001->response[1])
478                 return -ENXIO;
479 
480         __set_bit(EV_KEY, dev->evbit);
481         __set_bit(EV_ABS, dev->evbit);
482         __set_bit(BTN_TOUCH, dev->keybit);
483         __set_bit(INPUT_PROP_DIRECT, dev->propbit);
484 
485         parse_touchquery(w8001->response, &touch);
486         w8001->max_touch_x = touch.x;
487         w8001->max_touch_y = touch.y;
488 
489         if (w8001->max_pen_x && w8001->max_pen_y) {
490                 /* if pen is supported scale to pen maximum */
491                 touch.x = w8001->max_pen_x;
492                 touch.y = w8001->max_pen_y;
493                 touch.panel_res = W8001_PEN_RESOLUTION;
494         }
495 
496         input_set_abs_params(dev, ABS_X, 0, touch.x, 0, 0);
497         input_set_abs_params(dev, ABS_Y, 0, touch.y, 0, 0);
498         input_abs_set_res(dev, ABS_X, touch.panel_res);
499         input_abs_set_res(dev, ABS_Y, touch.panel_res);
500 
501         switch (touch.sensor_id) {
502         case 0:
503         case 2:
504                 w8001->pktlen = W8001_PKTLEN_TOUCH93;
505                 w8001->id = 0x93;
506                 strlcat(basename, " 1FG", basename_sz);
507                 break;
508 
509         case 1:
510         case 3:
511         case 4:
512                 w8001->pktlen = W8001_PKTLEN_TOUCH9A;
513                 strlcat(basename, " 1FG", basename_sz);
514                 w8001->id = 0x9a;
515                 break;
516 
517         case 5:
518                 w8001->pktlen = W8001_PKTLEN_TOUCH2FG;
519 
520                 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
521                 error = input_mt_init_slots(dev, 2, 0);
522                 if (error) {
523                         dev_err(&w8001->serio->dev,
524                                 "failed to initialize MT slots: %d\n", error);
525                         return error;
526                 }
527 
528                 input_set_abs_params(dev, ABS_MT_POSITION_X,
529                                         0, touch.x, 0, 0);
530                 input_set_abs_params(dev, ABS_MT_POSITION_Y,
531                                         0, touch.y, 0, 0);
532                 input_set_abs_params(dev, ABS_MT_TOOL_TYPE,
533                                         0, MT_TOOL_MAX, 0, 0);
534                 input_abs_set_res(dev, ABS_MT_POSITION_X, touch.panel_res);
535                 input_abs_set_res(dev, ABS_MT_POSITION_Y, touch.panel_res);
536 
537                 strlcat(basename, " 2FG", basename_sz);
538                 if (w8001->max_pen_x && w8001->max_pen_y)
539                         w8001->id = 0xE3;
540                 else
541                         w8001->id = 0xE2;
542                 break;
543         }
544 
545         strlcat(basename, " Touchscreen", basename_sz);
546 
547         return 0;
548 }
549 
550 static void w8001_set_devdata(struct input_dev *dev, struct w8001 *w8001,
551                               struct serio *serio)
552 {
553         dev->phys = w8001->phys;
554         dev->id.bustype = BUS_RS232;
555         dev->id.product = w8001->id;
556         dev->id.vendor = 0x056a;
557         dev->id.version = 0x0100;
558         dev->open = w8001_open;
559         dev->close = w8001_close;
560 
561         dev->dev.parent = &serio->dev;
562 
563         input_set_drvdata(dev, w8001);
564 }
565 
566 /*
567  * w8001_disconnect() is the opposite of w8001_connect()
568  */
569 
570 static void w8001_disconnect(struct serio *serio)
571 {
572         struct w8001 *w8001 = serio_get_drvdata(serio);
573 
574         serio_close(serio);
575 
576         if (w8001->pen_dev)
577                 input_unregister_device(w8001->pen_dev);
578         if (w8001->touch_dev)
579                 input_unregister_device(w8001->touch_dev);
580         kfree(w8001);
581 
582         serio_set_drvdata(serio, NULL);
583 }
584 
585 /*
586  * w8001_connect() is the routine that is called when someone adds a
587  * new serio device that supports the w8001 protocol and registers it as
588  * an input device.
589  */
590 
591 static int w8001_connect(struct serio *serio, struct serio_driver *drv)
592 {
593         struct w8001 *w8001;
594         struct input_dev *input_dev_pen;
595         struct input_dev *input_dev_touch;
596         char basename[64];
597         int err, err_pen, err_touch;
598 
599         w8001 = kzalloc(sizeof(struct w8001), GFP_KERNEL);
600         input_dev_pen = input_allocate_device();
601         input_dev_touch = input_allocate_device();
602         if (!w8001 || !input_dev_pen || !input_dev_touch) {
603                 err = -ENOMEM;
604                 goto fail1;
605         }
606 
607         w8001->serio = serio;
608         w8001->pen_dev = input_dev_pen;
609         w8001->touch_dev = input_dev_touch;
610         mutex_init(&w8001->mutex);
611         init_completion(&w8001->cmd_done);
612         snprintf(w8001->phys, sizeof(w8001->phys), "%s/input0", serio->phys);
613 
614         serio_set_drvdata(serio, w8001);
615         err = serio_open(serio, drv);
616         if (err)
617                 goto fail2;
618 
619         err = w8001_detect(w8001);
620         if (err)
621                 goto fail3;
622 
623         /* For backwards-compatibility we compose the basename based on
624          * capabilities and then just append the tool type
625          */
626         strlcpy(basename, "Wacom Serial", sizeof(basename));
627 
628         err_pen = w8001_setup_pen(w8001, basename, sizeof(basename));
629         err_touch = w8001_setup_touch(w8001, basename, sizeof(basename));
630         if (err_pen && err_touch) {
631                 err = -ENXIO;
632                 goto fail3;
633         }
634 
635         if (!err_pen) {
636                 strlcpy(w8001->pen_name, basename, sizeof(w8001->pen_name));
637                 strlcat(w8001->pen_name, " Pen", sizeof(w8001->pen_name));
638                 input_dev_pen->name = w8001->pen_name;
639 
640                 w8001_set_devdata(input_dev_pen, w8001, serio);
641 
642                 err = input_register_device(w8001->pen_dev);
643                 if (err)
644                         goto fail3;
645         } else {
646                 input_free_device(input_dev_pen);
647                 input_dev_pen = NULL;
648                 w8001->pen_dev = NULL;
649         }
650 
651         if (!err_touch) {
652                 strlcpy(w8001->touch_name, basename, sizeof(w8001->touch_name));
653                 strlcat(w8001->touch_name, " Finger",
654                         sizeof(w8001->touch_name));
655                 input_dev_touch->name = w8001->touch_name;
656 
657                 w8001_set_devdata(input_dev_touch, w8001, serio);
658 
659                 err = input_register_device(w8001->touch_dev);
660                 if (err)
661                         goto fail4;
662         } else {
663                 input_free_device(input_dev_touch);
664                 input_dev_touch = NULL;
665                 w8001->touch_dev = NULL;
666         }
667 
668         return 0;
669 
670 fail4:
671         if (w8001->pen_dev)
672                 input_unregister_device(w8001->pen_dev);
673 fail3:
674         serio_close(serio);
675 fail2:
676         serio_set_drvdata(serio, NULL);
677 fail1:
678         input_free_device(input_dev_pen);
679         input_free_device(input_dev_touch);
680         kfree(w8001);
681         return err;
682 }
683 
684 static struct serio_device_id w8001_serio_ids[] = {
685         {
686                 .type   = SERIO_RS232,
687                 .proto  = SERIO_W8001,
688                 .id     = SERIO_ANY,
689                 .extra  = SERIO_ANY,
690         },
691         { 0 }
692 };
693 
694 MODULE_DEVICE_TABLE(serio, w8001_serio_ids);
695 
696 static struct serio_driver w8001_drv = {
697         .driver         = {
698                 .name   = "w8001",
699         },
700         .description    = DRIVER_DESC,
701         .id_table       = w8001_serio_ids,
702         .interrupt      = w8001_interrupt,
703         .connect        = w8001_connect,
704         .disconnect     = w8001_disconnect,
705 };
706 
707 module_serio_driver(w8001_drv);
708 

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