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Linux/drivers/input/touchscreen/elo.c

  1 /*
  2  * Elo serial touchscreen driver
  3  *
  4  * Copyright (c) 2004 Vojtech Pavlik
  5  */
  6 
  7 /*
  8  * This program is free software; you can redistribute it and/or modify it
  9  * under the terms of the GNU General Public License version 2 as published by
 10  * the Free Software Foundation.
 11  */
 12 
 13 /*
 14  * This driver can handle serial Elo touchscreens using either the Elo standard
 15  * 'E271-2210' 10-byte protocol, Elo legacy 'E281A-4002' 6-byte protocol, Elo
 16  * legacy 'E271-140' 4-byte protocol and Elo legacy 'E261-280' 3-byte protocol.
 17  */
 18 
 19 #include <linux/errno.h>
 20 #include <linux/kernel.h>
 21 #include <linux/module.h>
 22 #include <linux/slab.h>
 23 #include <linux/input.h>
 24 #include <linux/serio.h>
 25 #include <linux/ctype.h>
 26 
 27 #define DRIVER_DESC     "Elo serial touchscreen driver"
 28 
 29 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 30 MODULE_DESCRIPTION(DRIVER_DESC);
 31 MODULE_LICENSE("GPL");
 32 
 33 /*
 34  * Definitions & global arrays.
 35  */
 36 
 37 #define ELO_MAX_LENGTH          10
 38 
 39 #define ELO10_PACKET_LEN        8
 40 #define ELO10_TOUCH             0x03
 41 #define ELO10_PRESSURE          0x80
 42 
 43 #define ELO10_LEAD_BYTE         'U'
 44 
 45 #define ELO10_ID_CMD            'i'
 46 
 47 #define ELO10_TOUCH_PACKET      'T'
 48 #define ELO10_ACK_PACKET        'A'
 49 #define ELI10_ID_PACKET         'I'
 50 
 51 /*
 52  * Per-touchscreen data.
 53  */
 54 
 55 struct elo {
 56         struct input_dev *dev;
 57         struct serio *serio;
 58         struct mutex cmd_mutex;
 59         struct completion cmd_done;
 60         int id;
 61         int idx;
 62         unsigned char expected_packet;
 63         unsigned char csum;
 64         unsigned char data[ELO_MAX_LENGTH];
 65         unsigned char response[ELO10_PACKET_LEN];
 66         char phys[32];
 67 };
 68 
 69 static void elo_process_data_10(struct elo *elo, unsigned char data)
 70 {
 71         struct input_dev *dev = elo->dev;
 72 
 73         elo->data[elo->idx] = data;
 74 
 75         switch (elo->idx++) {
 76         case 0:
 77                 elo->csum = 0xaa;
 78                 if (data != ELO10_LEAD_BYTE) {
 79                         dev_dbg(&elo->serio->dev,
 80                                 "unsynchronized data: 0x%02x\n", data);
 81                         elo->idx = 0;
 82                 }
 83                 break;
 84 
 85         case 9:
 86                 elo->idx = 0;
 87                 if (data != elo->csum) {
 88                         dev_dbg(&elo->serio->dev,
 89                                 "bad checksum: 0x%02x, expected 0x%02x\n",
 90                                  data, elo->csum);
 91                         break;
 92                 }
 93                 if (elo->data[1] != elo->expected_packet) {
 94                         if (elo->data[1] != ELO10_TOUCH_PACKET)
 95                                 dev_dbg(&elo->serio->dev,
 96                                         "unexpected packet: 0x%02x\n",
 97                                          elo->data[1]);
 98                         break;
 99                 }
100                 if (likely(elo->data[1] == ELO10_TOUCH_PACKET)) {
101                         input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]);
102                         input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]);
103                         if (elo->data[2] & ELO10_PRESSURE)
104                                 input_report_abs(dev, ABS_PRESSURE,
105                                                 (elo->data[8] << 8) | elo->data[7]);
106                         input_report_key(dev, BTN_TOUCH, elo->data[2] & ELO10_TOUCH);
107                         input_sync(dev);
108                 } else if (elo->data[1] == ELO10_ACK_PACKET) {
109                         if (elo->data[2] == '')
110                                 elo->expected_packet = ELO10_TOUCH_PACKET;
111                         complete(&elo->cmd_done);
112                 } else {
113                         memcpy(elo->response, &elo->data[1], ELO10_PACKET_LEN);
114                         elo->expected_packet = ELO10_ACK_PACKET;
115                 }
116                 break;
117         }
118         elo->csum += data;
119 }
120 
121 static void elo_process_data_6(struct elo *elo, unsigned char data)
122 {
123         struct input_dev *dev = elo->dev;
124 
125         elo->data[elo->idx] = data;
126 
127         switch (elo->idx++) {
128 
129         case 0:
130                 if ((data & 0xc0) != 0xc0)
131                         elo->idx = 0;
132                 break;
133 
134         case 1:
135                 if ((data & 0xc0) != 0x80)
136                         elo->idx = 0;
137                 break;
138 
139         case 2:
140                 if ((data & 0xc0) != 0x40)
141                         elo->idx = 0;
142                 break;
143 
144         case 3:
145                 if (data & 0xc0) {
146                         elo->idx = 0;
147                         break;
148                 }
149 
150                 input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f));
151                 input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f));
152 
153                 if (elo->id == 2) {
154                         input_report_key(dev, BTN_TOUCH, 1);
155                         input_sync(dev);
156                         elo->idx = 0;
157                 }
158 
159                 break;
160 
161         case 4:
162                 if (data) {
163                         input_sync(dev);
164                         elo->idx = 0;
165                 }
166                 break;
167 
168         case 5:
169                 if ((data & 0xf0) == 0) {
170                         input_report_abs(dev, ABS_PRESSURE, elo->data[5]);
171                         input_report_key(dev, BTN_TOUCH, !!elo->data[5]);
172                 }
173                 input_sync(dev);
174                 elo->idx = 0;
175                 break;
176         }
177 }
178 
179 static void elo_process_data_3(struct elo *elo, unsigned char data)
180 {
181         struct input_dev *dev = elo->dev;
182 
183         elo->data[elo->idx] = data;
184 
185         switch (elo->idx++) {
186 
187         case 0:
188                 if ((data & 0x7f) != 0x01)
189                         elo->idx = 0;
190                 break;
191         case 2:
192                 input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));
193                 input_report_abs(dev, ABS_X, elo->data[1]);
194                 input_report_abs(dev, ABS_Y, elo->data[2]);
195                 input_sync(dev);
196                 elo->idx = 0;
197                 break;
198         }
199 }
200 
201 static irqreturn_t elo_interrupt(struct serio *serio,
202                 unsigned char data, unsigned int flags)
203 {
204         struct elo *elo = serio_get_drvdata(serio);
205 
206         switch (elo->id) {
207         case 0:
208                 elo_process_data_10(elo, data);
209                 break;
210 
211         case 1:
212         case 2:
213                 elo_process_data_6(elo, data);
214                 break;
215 
216         case 3:
217                 elo_process_data_3(elo, data);
218                 break;
219         }
220 
221         return IRQ_HANDLED;
222 }
223 
224 static int elo_command_10(struct elo *elo, unsigned char *packet)
225 {
226         int rc = -1;
227         int i;
228         unsigned char csum = 0xaa + ELO10_LEAD_BYTE;
229 
230         mutex_lock(&elo->cmd_mutex);
231 
232         serio_pause_rx(elo->serio);
233         elo->expected_packet = toupper(packet[0]);
234         init_completion(&elo->cmd_done);
235         serio_continue_rx(elo->serio);
236 
237         if (serio_write(elo->serio, ELO10_LEAD_BYTE))
238                 goto out;
239 
240         for (i = 0; i < ELO10_PACKET_LEN; i++) {
241                 csum += packet[i];
242                 if (serio_write(elo->serio, packet[i]))
243                         goto out;
244         }
245 
246         if (serio_write(elo->serio, csum))
247                 goto out;
248 
249         wait_for_completion_timeout(&elo->cmd_done, HZ);
250 
251         if (elo->expected_packet == ELO10_TOUCH_PACKET) {
252                 /* We are back in reporting mode, the command was ACKed */
253                 memcpy(packet, elo->response, ELO10_PACKET_LEN);
254                 rc = 0;
255         }
256 
257  out:
258         mutex_unlock(&elo->cmd_mutex);
259         return rc;
260 }
261 
262 static int elo_setup_10(struct elo *elo)
263 {
264         static const char *elo_types[] = { "Accu", "Dura", "Intelli", "Carroll" };
265         struct input_dev *dev = elo->dev;
266         unsigned char packet[ELO10_PACKET_LEN] = { ELO10_ID_CMD };
267 
268         if (elo_command_10(elo, packet))
269                 return -1;
270 
271         dev->id.version = (packet[5] << 8) | packet[4];
272 
273         input_set_abs_params(dev, ABS_X, 96, 4000, 0, 0);
274         input_set_abs_params(dev, ABS_Y, 96, 4000, 0, 0);
275         if (packet[3] & ELO10_PRESSURE)
276                 input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
277 
278         dev_info(&elo->serio->dev,
279                  "%sTouch touchscreen, fw: %02x.%02x, features: 0x%02x, controller: 0x%02x\n",
280                  elo_types[(packet[1] -'') & 0x03],
281                  packet[5], packet[4], packet[3], packet[7]);
282 
283         return 0;
284 }
285 
286 /*
287  * elo_disconnect() is the opposite of elo_connect()
288  */
289 
290 static void elo_disconnect(struct serio *serio)
291 {
292         struct elo *elo = serio_get_drvdata(serio);
293 
294         input_get_device(elo->dev);
295         input_unregister_device(elo->dev);
296         serio_close(serio);
297         serio_set_drvdata(serio, NULL);
298         input_put_device(elo->dev);
299         kfree(elo);
300 }
301 
302 /*
303  * elo_connect() is the routine that is called when someone adds a
304  * new serio device that supports Gunze protocol and registers it as
305  * an input device.
306  */
307 
308 static int elo_connect(struct serio *serio, struct serio_driver *drv)
309 {
310         struct elo *elo;
311         struct input_dev *input_dev;
312         int err;
313 
314         elo = kzalloc(sizeof(struct elo), GFP_KERNEL);
315         input_dev = input_allocate_device();
316         if (!elo || !input_dev) {
317                 err = -ENOMEM;
318                 goto fail1;
319         }
320 
321         elo->serio = serio;
322         elo->id = serio->id.id;
323         elo->dev = input_dev;
324         elo->expected_packet = ELO10_TOUCH_PACKET;
325         mutex_init(&elo->cmd_mutex);
326         init_completion(&elo->cmd_done);
327         snprintf(elo->phys, sizeof(elo->phys), "%s/input0", serio->phys);
328 
329         input_dev->name = "Elo Serial TouchScreen";
330         input_dev->phys = elo->phys;
331         input_dev->id.bustype = BUS_RS232;
332         input_dev->id.vendor = SERIO_ELO;
333         input_dev->id.product = elo->id;
334         input_dev->id.version = 0x0100;
335         input_dev->dev.parent = &serio->dev;
336 
337         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
338         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
339 
340         serio_set_drvdata(serio, elo);
341         err = serio_open(serio, drv);
342         if (err)
343                 goto fail2;
344 
345         switch (elo->id) {
346 
347         case 0: /* 10-byte protocol */
348                 if (elo_setup_10(elo))
349                         goto fail3;
350 
351                 break;
352 
353         case 1: /* 6-byte protocol */
354                 input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0);
355 
356         case 2: /* 4-byte protocol */
357                 input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
358                 input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
359                 break;
360 
361         case 3: /* 3-byte protocol */
362                 input_set_abs_params(input_dev, ABS_X, 0, 255, 0, 0);
363                 input_set_abs_params(input_dev, ABS_Y, 0, 255, 0, 0);
364                 break;
365         }
366 
367         err = input_register_device(elo->dev);
368         if (err)
369                 goto fail3;
370 
371         return 0;
372 
373  fail3: serio_close(serio);
374  fail2: serio_set_drvdata(serio, NULL);
375  fail1: input_free_device(input_dev);
376         kfree(elo);
377         return err;
378 }
379 
380 /*
381  * The serio driver structure.
382  */
383 
384 static struct serio_device_id elo_serio_ids[] = {
385         {
386                 .type   = SERIO_RS232,
387                 .proto  = SERIO_ELO,
388                 .id     = SERIO_ANY,
389                 .extra  = SERIO_ANY,
390         },
391         { 0 }
392 };
393 
394 MODULE_DEVICE_TABLE(serio, elo_serio_ids);
395 
396 static struct serio_driver elo_drv = {
397         .driver         = {
398                 .name   = "elo",
399         },
400         .description    = DRIVER_DESC,
401         .id_table       = elo_serio_ids,
402         .interrupt      = elo_interrupt,
403         .connect        = elo_connect,
404         .disconnect     = elo_disconnect,
405 };
406 
407 module_serio_driver(elo_drv);
408 

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