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Linux v2.6.13
[linux-2.6/next.git] / drivers / input / touchscreen / h3600_ts_input.c
blobbcfa1e36f957f47b03ce6e08bc5b49bf0803874e
1 /*
2 * $Id: h3600_ts_input.c,v 1.4 2002/01/23 06:39:37 jsimmons Exp $
3 *
4 * Copyright (c) 2001 "Crazy" James Simmons jsimmons@transvirtual.com
5 *
6 * Sponsored by Transvirtual Technology.
7 *
8 * Derived from the code in h3600_ts.[ch] by Charles Flynn
9 */
10
11 /*
12 * Driver for the h3600 Touch Screen and other Atmel controlled devices.
13 */
14
15 /*
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 *
30 * Should you need to contact me, the author, you can do so by
31 * e-mail - mail your message to <jsimmons@transvirtual.com>.
32 */
33
34 #include <linux/errno.h>
35 #include <linux/kernel.h>
36 #include <linux/module.h>
37 #include <linux/slab.h>
38 #include <linux/input.h>
39 #include <linux/serio.h>
40 #include <linux/init.h>
41 #include <linux/delay.h>
42 #include <linux/pm.h>
43
44 /* SA1100 serial defines */
45 #include <asm/arch/hardware.h>
46 #include <asm/arch/irqs.h>
47
48 #define DRIVER_DESC "H3600 touchscreen driver"
49
50 MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
51 MODULE_DESCRIPTION(DRIVER_DESC);
52 MODULE_LICENSE("GPL");
53
54 /*
55 * Definitions & global arrays.
56 */
57
58 /* The start and end of frame characters SOF and EOF */
59 #define CHAR_SOF 0x02
60 #define CHAR_EOF 0x03
61 #define FRAME_OVERHEAD 3 /* CHAR_SOF,CHAR_EOF,LENGTH = 3 */
62
63 /*
64 Atmel events and response IDs contained in frame.
65 Programmer has no control over these numbers.
66 TODO there are holes - specifically 1,7,0x0a
67 */
68 #define VERSION_ID 0 /* Get Version (request/respose) */
69 #define KEYBD_ID 2 /* Keyboard (event) */
70 #define TOUCHS_ID 3 /* Touch Screen (event)*/
71 #define EEPROM_READ_ID 4 /* (request/response) */
72 #define EEPROM_WRITE_ID 5 /* (request/response) */
73 #define THERMAL_ID 6 /* (request/response) */
74 #define NOTIFY_LED_ID 8 /* (request/response) */
75 #define BATTERY_ID 9 /* (request/response) */
76 #define SPI_READ_ID 0x0b /* ( request/response) */
77 #define SPI_WRITE_ID 0x0c /* ( request/response) */
78 #define FLITE_ID 0x0d /* backlight ( request/response) */
79 #define STX_ID 0xa1 /* extension pack status (req/resp) */
80
81 #define MAX_ID 14
82
83 #define H3600_MAX_LENGTH 16
84 #define H3600_KEY 0xf
85
86 #define H3600_SCANCODE_RECORD 1 /* 1 -> record button */
87 #define H3600_SCANCODE_CALENDAR 2 /* 2 -> calendar */
88 #define H3600_SCANCODE_CONTACTS 3 /* 3 -> contact */
89 #define H3600_SCANCODE_Q 4 /* 4 -> Q button */
90 #define H3600_SCANCODE_START 5 /* 5 -> start menu */
91 #define H3600_SCANCODE_UP 6 /* 6 -> up */
92 #define H3600_SCANCODE_RIGHT 7 /* 7 -> right */
93 #define H3600_SCANCODE_LEFT 8 /* 8 -> left */
94 #define H3600_SCANCODE_DOWN 9 /* 9 -> down */
95
96 static char *h3600_name = "H3600 TouchScreen";
97
98 /*
99 * Per-touchscreen data.
100 */
101 struct h3600_dev {
102 struct input_dev dev;
103 struct pm_dev *pm_dev;
104 struct serio *serio;
105 struct pm_dev *pm_dev;
106 unsigned char event; /* event ID from packet */
107 unsigned char chksum;
108 unsigned char len;
109 unsigned char idx;
110 unsigned char buf[H3600_MAX_LENGTH];
111 char phys[32];
112 };
113
114 static irqreturn_t action_button_handler(int irq, void *dev_id, struct pt_regs *regs)
115 {
116 int down = (GPLR & GPIO_BITSY_ACTION_BUTTON) ? 0 : 1;
117 struct input_dev *dev = (struct input_dev *) dev_id;
118
119 input_regs(dev, regs);
120 input_report_key(dev, KEY_ENTER, down);
121 input_sync(dev);
122
123 return IRQ_HANDLED;
124 }
125
126 static irqreturn_t npower_button_handler(int irq, void *dev_id, struct pt_regs *regs)
127 {
128 int down = (GPLR & GPIO_BITSY_NPOWER_BUTTON) ? 0 : 1;
129 struct input_dev *dev = (struct input_dev *) dev_id;
130
131 /*
132 * This interrupt is only called when we release the key. So we have
133 * to fake a key press.
134 */
135 input_regs(dev, regs);
136 input_report_key(dev, KEY_SUSPEND, 1);
137 input_report_key(dev, KEY_SUSPEND, down);
138 input_sync(dev);
139
140 return IRQ_HANDLED;
141 }
142
143 #ifdef CONFIG_PM
144
145 static int flite_brightness = 25;
146
147 enum flite_pwr {
148 FLITE_PWR_OFF = 0,
149 FLITE_PWR_ON = 1
150 };
151
152 /*
153 * h3600_flite_power: enables or disables power to frontlight, using last bright */
154 unsigned int h3600_flite_power(struct input_dev *dev, enum flite_pwr pwr)
155 {
156 unsigned char brightness = (pwr == FLITE_PWR_OFF) ? 0 : flite_brightness;
157 struct h3600_dev *ts = dev->private;
158
159 /* Must be in this order */
160 ts->serio->write(ts->serio, 1);
161 ts->serio->write(ts->serio, pwr);
162 ts->serio->write(ts->serio, brightness);
163 return 0;
164 }
165
166 static int suspended = 0;
167 static int h3600ts_pm_callback(struct pm_dev *pm_dev, pm_request_t req,
168 void *data)
169 {
170 struct input_dev *dev = (struct input_dev *) data;
171
172 switch (req) {
173 case PM_SUSPEND: /* enter D1-D3 */
174 suspended = 1;
175 h3600_flite_power(dev, FLITE_PWR_OFF);
176 break;
177 case PM_BLANK:
178 if (!suspended)
179 h3600_flite_power(dev, FLITE_PWR_OFF);
180 break;
181 case PM_RESUME: /* enter D0 */
182 /* same as unblank */
183 case PM_UNBLANK:
184 if (suspended) {
185 //initSerial();
186 suspended = 0;
187 }
188 h3600_flite_power(dev, FLITE_PWR_ON);
189 break;
190 }
191 return 0;
192 }
193 #endif
194
195 /*
196 * This function translates the native event packets to linux input event
197 * packets. Some packets coming from serial are not touchscreen related. In
198 * this case we send them off to be processed elsewhere.
199 */
200 static void h3600ts_process_packet(struct h3600_dev *ts, struct pt_regs *regs)
201 {
202 struct input_dev *dev = &ts->dev;
203 static int touched = 0;
204 int key, down = 0;
205
206 input_regs(dev, regs);
207
208 switch (ts->event) {
209 /*
210 Buttons - returned as a single byte
211 7 6 5 4 3 2 1 0
212 S x x x N N N N
213
214 S switch state ( 0=pressed 1=released)
215 x Unused.
216 NNNN switch number 0-15
217
218 Note: This is true for non interrupt generated key events.
219 */
220 case KEYBD_ID:
221 down = (ts->buf[0] & 0x80) ? 0 : 1;
222
223 switch (ts->buf[0] & 0x7f) {
224 case H3600_SCANCODE_RECORD:
225 key = KEY_RECORD;
226 break;
227 case H3600_SCANCODE_CALENDAR:
228 key = KEY_PROG1;
229 break;
230 case H3600_SCANCODE_CONTACTS:
231 key = KEY_PROG2;
232 break;
233 case H3600_SCANCODE_Q:
234 key = KEY_Q;
235 break;
236 case H3600_SCANCODE_START:
237 key = KEY_PROG3;
238 break;
239 case H3600_SCANCODE_UP:
240 key = KEY_UP;
241 break;
242 case H3600_SCANCODE_RIGHT:
243 key = KEY_RIGHT;
244 break;
245 case H3600_SCANCODE_LEFT:
246 key = KEY_LEFT;
247 break;
248 case H3600_SCANCODE_DOWN:
249 key = KEY_DOWN;
250 break;
251 default:
252 key = 0;
253 }
254 if (key)
255 input_report_key(dev, key, down);
256 break;
257 /*
258 * Native touchscreen event data is formatted as shown below:-
259 *
260 * +-------+-------+-------+-------+
261 * | Xmsb | Xlsb | Ymsb | Ylsb |
262 * +-------+-------+-------+-------+
263 * byte 0 1 2 3
264 */
265 case TOUCHS_ID:
266 if (!touched) {
267 input_report_key(dev, BTN_TOUCH, 1);
268 touched = 1;
269 }
270
271 if (ts->len) {
272 unsigned short x, y;
273
274 x = ts->buf[0]; x <<= 8; x += ts->buf[1];
275 y = ts->buf[2]; y <<= 8; y += ts->buf[3];
276
277 input_report_abs(dev, ABS_X, x);
278 input_report_abs(dev, ABS_Y, y);
279 } else {
280 input_report_key(dev, BTN_TOUCH, 0);
281 touched = 0;
282 }
283 break;
284 default:
285 /* Send a non input event elsewhere */
286 break;
287 }
288
289 input_sync(dev);
290 }
291
292 /*
293 * h3600ts_event() handles events from the input module.
294 */
295 static int h3600ts_event(struct input_dev *dev, unsigned int type,
296 unsigned int code, int value)
297 {
298 struct h3600_dev *ts = dev->private;
299
300 switch (type) {
301 case EV_LED: {
302 // ts->serio->write(ts->serio, SOME_CMD);
303 return 0;
304 }
305 }
306 return -1;
307 }
308
309 /*
310 Frame format
311 byte 1 2 3 len + 4
312 +-------+---------------+---------------+--=------------+
313 |SOF |id |len | len bytes | Chksum |
314 +-------+---------------+---------------+--=------------+
315 bit 0 7 8 11 12 15 16
316
317 +-------+---------------+-------+
318 |SOF |id |0 |Chksum | - Note Chksum does not include SOF
319 +-------+---------------+-------+
320 bit 0 7 8 11 12 15 16
321
322 */
323
324 static int state;
325
326 /* decode States */
327 #define STATE_SOF 0 /* start of FRAME */
328 #define STATE_ID 1 /* state where we decode the ID & len */
329 #define STATE_DATA 2 /* state where we decode data */
330 #define STATE_EOF 3 /* state where we decode checksum or EOF */
331
332 static irqreturn_t h3600ts_interrupt(struct serio *serio, unsigned char data,
333 unsigned int flags, struct pt_regs *regs)
334 {
335 struct h3600_dev *ts = serio_get_drvdata(serio);
336
337 /*
338 * We have a new frame coming in.
339 */
340 switch (state) {
341 case STATE_SOF:
342 if (data == CHAR_SOF)
343 state = STATE_ID;
344 break;
345 case STATE_ID:
346 ts->event = (data & 0xf0) >> 4;
347 ts->len = (data & 0xf);
348 ts->idx = 0;
349 if (ts->event >= MAX_ID) {
350 state = STATE_SOF;
351 break;
352 }
353 ts->chksum = data;
354 state = (ts->len > 0) ? STATE_DATA : STATE_EOF;
355 break;
356 case STATE_DATA:
357 ts->chksum += data;
358 ts->buf[ts->idx]= data;
359 if (++ts->idx == ts->len)
360 state = STATE_EOF;
361 break;
362 case STATE_EOF:
363 state = STATE_SOF;
364 if (data == CHAR_EOF || data == ts->chksum)
365 h3600ts_process_packet(ts, regs);
366 break;
367 default:
368 printk("Error3\n");
369 break;
370 }
371
372 return IRQ_HANDLED;
373 }
374
375 /*
376 * h3600ts_connect() is the routine that is called when someone adds a
377 * new serio device that supports H3600 protocol and registers it as
378 * an input device.
379 */
380 static int h3600ts_connect(struct serio *serio, struct serio_driver *drv)
381 {
382 struct h3600_dev *ts;
383 int err;
384
385 if (!(ts = kmalloc(sizeof(struct h3600_dev), GFP_KERNEL)))
386 return -ENOMEM;
387
388 memset(ts, 0, sizeof(struct h3600_dev));
389
390 init_input_dev(&ts->dev);
391
392 /* Device specific stuff */
393 set_GPIO_IRQ_edge(GPIO_BITSY_ACTION_BUTTON, GPIO_BOTH_EDGES);
394 set_GPIO_IRQ_edge(GPIO_BITSY_NPOWER_BUTTON, GPIO_RISING_EDGE);
395
396 if (request_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, action_button_handler,
397 SA_SHIRQ | SA_INTERRUPT | SA_SAMPLE_RANDOM,
398 "h3600_action", &ts->dev)) {
399 printk(KERN_ERR "h3600ts.c: Could not allocate Action Button IRQ!\n");
400 kfree(ts);
401 return -EBUSY;
402 }
403
404 if (request_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, npower_button_handler,
405 SA_SHIRQ | SA_INTERRUPT | SA_SAMPLE_RANDOM,
406 "h3600_suspend", &ts->dev)) {
407 free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, &ts->dev);
408 printk(KERN_ERR "h3600ts.c: Could not allocate Power Button IRQ!\n");
409 kfree(ts);
410 return -EBUSY;
411 }
412
413 /* Now we have things going we setup our input device */
414 ts->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_LED) | BIT(EV_PWR);
415 ts->dev.ledbit[0] = BIT(LED_SLEEP);
416 input_set_abs_params(&ts->dev, ABS_X, 60, 985, 0, 0);
417 input_set_abs_params(&ts->dev, ABS_Y, 35, 1024, 0, 0);
418
419 set_bit(KEY_RECORD, ts->dev.keybit);
420 set_bit(KEY_Q, ts->dev.keybit);
421 set_bit(KEY_PROG1, ts->dev.keybit);
422 set_bit(KEY_PROG2, ts->dev.keybit);
423 set_bit(KEY_PROG3, ts->dev.keybit);
424 set_bit(KEY_UP, ts->dev.keybit);
425 set_bit(KEY_RIGHT, ts->dev.keybit);
426 set_bit(KEY_LEFT, ts->dev.keybit);
427 set_bit(KEY_DOWN, ts->dev.keybit);
428 set_bit(KEY_ENTER, ts->dev.keybit);
429 ts->dev.keybit[LONG(BTN_TOUCH)] |= BIT(BTN_TOUCH);
430 ts->dev.keybit[LONG(KEY_SUSPEND)] |= BIT(KEY_SUSPEND);
431
432 ts->serio = serio;
433
434 sprintf(ts->phys, "%s/input0", serio->phys);
435
436 ts->dev.event = h3600ts_event;
437 ts->dev.private = ts;
438 ts->dev.name = h3600_name;
439 ts->dev.phys = ts->phys;
440 ts->dev.id.bustype = BUS_RS232;
441 ts->dev.id.vendor = SERIO_H3600;
442 ts->dev.id.product = 0x0666; /* FIXME !!! We can ask the hardware */
443 ts->dev.id.version = 0x0100;
444
445 serio_set_drvdata(serio, ts);
446
447 err = serio_open(serio, drv);
448 if (err) {
449 free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, ts);
450 free_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, ts);
451 serio_set_drvdata(serio, NULL);
452 kfree(ts);
453 return err;
454 }
455
456 //h3600_flite_control(1, 25); /* default brightness */
457 #ifdef CONFIG_PM
458 ts->pm_dev = pm_register(PM_ILLUMINATION_DEV, PM_SYS_LIGHT,
459 h3600ts_pm_callback);
460 printk("registered pm callback\n");
461 #endif
462 input_register_device(&ts->dev);
463
464 printk(KERN_INFO "input: %s on %s\n", h3600_name, serio->phys);
465
466 return 0;
467 }
468
469 /*
470 * h3600ts_disconnect() is the opposite of h3600ts_connect()
471 */
472
473 static void h3600ts_disconnect(struct serio *serio)
474 {
475 struct h3600_dev *ts = serio_get_drvdata(serio);
476
477 free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, &ts->dev);
478 free_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, &ts->dev);
479 input_unregister_device(&ts->dev);
480 serio_close(serio);
481 serio_set_drvdata(serio, NULL);
482 kfree(ts);
483 }
484
485 /*
486 * The serio driver structure.
487 */
488
489 static struct serio_device_id h3600ts_serio_ids[] = {
490 {
491 .type = SERIO_RS232,
492 .proto = SERIO_H3600,
493 .id = SERIO_ANY,
494 .extra = SERIO_ANY,
495 },
496 { 0 }
497 };
498
499 MODULE_DEVICE_TABLE(serio, h3600ts_serio_ids);
500
501 static struct serio_driver h3600ts_drv = {
502 .driver = {
503 .name = "h3600ts",
504 },
505 .description = DRIVER_DESC,
506 .id_table = h3600ts_serio_ids,
507 .interrupt = h3600ts_interrupt,
508 .connect = h3600ts_connect,
509 .disconnect = h3600ts_disconnect,
510 };
511
512 /*
513 * The functions for inserting/removing us as a module.
514 */
515
516 static int __init h3600ts_init(void)
517 {
518 serio_register_driver(&h3600ts_drv);
519 return 0;
520 }
521
522 static void __exit h3600ts_exit(void)
523 {
524 serio_unregister_driver(&h3600ts_drv);
525 }
526
527 module_init(h3600ts_init);
528 module_exit(h3600ts_exit);
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