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 unsigned char event; /* event ID from packet */
106 unsigned char chksum;
107 unsigned char len;
108 unsigned char idx;
109 unsigned char buf[H3600_MAX_LENGTH];
110 char phys[32];
111 };
112
113 static irqreturn_t action_button_handler(int irq, void *dev_id, struct pt_regs *regs)
114 {
115 int down = (GPLR & GPIO_BITSY_ACTION_BUTTON) ? 0 : 1;
116 struct input_dev *dev = (struct input_dev *) dev_id;
117
118 input_regs(dev, regs);
119 input_report_key(dev, KEY_ENTER, down);
120 input_sync(dev);
121
122 return IRQ_HANDLED;
123 }
124
125 static irqreturn_t npower_button_handler(int irq, void *dev_id, struct pt_regs *regs)
126 {
127 int down = (GPLR & GPIO_BITSY_NPOWER_BUTTON) ? 0 : 1;
128 struct input_dev *dev = (struct input_dev *) dev_id;
129
130 /*
131 * This interrupt is only called when we release the key. So we have
132 * to fake a key press.
133 */
134 input_regs(dev, regs);
135 input_report_key(dev, KEY_SUSPEND, 1);
136 input_report_key(dev, KEY_SUSPEND, down);
137 input_sync(dev);
138
139 return IRQ_HANDLED;
140 }
141
142 #ifdef CONFIG_PM
143
144 static int flite_brightness = 25;
145
146 enum flite_pwr {
147 FLITE_PWR_OFF = 0,
148 FLITE_PWR_ON = 1
149 };
150
151 /*
152 * h3600_flite_power: enables or disables power to frontlight, using last bright */
153 unsigned int h3600_flite_power(struct input_dev *dev, enum flite_pwr pwr)
154 {
155 unsigned char brightness = (pwr == FLITE_PWR_OFF) ? 0 : flite_brightness;
156 struct h3600_dev *ts = dev->private;
157
158 /* Must be in this order */
159 ts->serio->write(ts->serio, 1);
160 ts->serio->write(ts->serio, pwr);
161 ts->serio->write(ts->serio, brightness);
162 return 0;
163 }
164
165 static int suspended = 0;
166 static int h3600ts_pm_callback(struct pm_dev *pm_dev, pm_request_t req,
167 void *data)
168 {
169 struct input_dev *dev = (struct input_dev *) data;
170
171 switch (req) {
172 case PM_SUSPEND: /* enter D1-D3 */
173 suspended = 1;
174 h3600_flite_power(dev, FLITE_PWR_OFF);
175 break;
176 case PM_BLANK:
177 if (!suspended)
178 h3600_flite_power(dev, FLITE_PWR_OFF);
179 break;
180 case PM_RESUME: /* enter D0 */
181 /* same as unblank */
182 case PM_UNBLANK:
183 if (suspended) {
184 //initSerial();
185 suspended = 0;
186 }
187 h3600_flite_power(dev, FLITE_PWR_ON);
188 break;
189 }
190 return 0;
191 }
192 #endif
193
194 /*
195 * This function translates the native event packets to linux input event
196 * packets. Some packets coming from serial are not touchscreen related. In
197 * this case we send them off to be processed elsewhere.
198 */
199 static void h3600ts_process_packet(struct h3600_dev *ts, struct pt_regs *regs)
200 {
201 struct input_dev *dev = &ts->dev;
202 static int touched = 0;
203 int key, down = 0;
204
205 input_regs(dev, regs);
206
207 switch (ts->event) {
208 /*
209 Buttons - returned as a single byte
210 7 6 5 4 3 2 1 0
211 S x x x N N N N
212
213 S switch state ( 0=pressed 1=released)
214 x Unused.
215 NNNN switch number 0-15
216
217 Note: This is true for non interrupt generated key events.
218 */
219 case KEYBD_ID:
220 down = (ts->buf[0] & 0x80) ? 0 : 1;
221
222 switch (ts->buf[0] & 0x7f) {
223 case H3600_SCANCODE_RECORD:
224 key = KEY_RECORD;
225 break;
226 case H3600_SCANCODE_CALENDAR:
227 key = KEY_PROG1;
228 break;
229 case H3600_SCANCODE_CONTACTS:
230 key = KEY_PROG2;
231 break;
232 case H3600_SCANCODE_Q:
233 key = KEY_Q;
234 break;
235 case H3600_SCANCODE_START:
236 key = KEY_PROG3;
237 break;
238 case H3600_SCANCODE_UP:
239 key = KEY_UP;
240 break;
241 case H3600_SCANCODE_RIGHT:
242 key = KEY_RIGHT;
243 break;
244 case H3600_SCANCODE_LEFT:
245 key = KEY_LEFT;
246 break;
247 case H3600_SCANCODE_DOWN:
248 key = KEY_DOWN;
249 break;
250 default:
251 key = 0;
252 }
253 if (key)
254 input_report_key(dev, key, down);
255 break;
256 /*
257 * Native touchscreen event data is formatted as shown below:-
258 *
259 * +-------+-------+-------+-------+
260 * | Xmsb | Xlsb | Ymsb | Ylsb |
261 * +-------+-------+-------+-------+
262 * byte 0 1 2 3
263 */
264 case TOUCHS_ID:
265 if (!touched) {
266 input_report_key(dev, BTN_TOUCH, 1);
267 touched = 1;
268 }
269
270 if (ts->len) {
271 unsigned short x, y;
272
273 x = ts->buf[0]; x <<= 8; x += ts->buf[1];
274 y = ts->buf[2]; y <<= 8; y += ts->buf[3];
275
276 input_report_abs(dev, ABS_X, x);
277 input_report_abs(dev, ABS_Y, y);
278 } else {
279 input_report_key(dev, BTN_TOUCH, 0);
280 touched = 0;
281 }
282 break;
283 default:
284 /* Send a non input event elsewhere */
285 break;
286 }
287
288 input_sync(dev);
289 }
290
291 /*
292 * h3600ts_event() handles events from the input module.
293 */
294 static int h3600ts_event(struct input_dev *dev, unsigned int type,
295 unsigned int code, int value)
296 {
297 struct h3600_dev *ts = dev->private;
298
299 switch (type) {
300 case EV_LED: {
301 // ts->serio->write(ts->serio, SOME_CMD);
302 return 0;
303 }
304 }
305 return -1;
306 }
307
308 /*
309 Frame format
310 byte 1 2 3 len + 4
311 +-------+---------------+---------------+--=------------+
312 |SOF |id |len | len bytes | Chksum |
313 +-------+---------------+---------------+--=------------+
314 bit 0 7 8 11 12 15 16
315
316 +-------+---------------+-------+
317 |SOF |id |0 |Chksum | - Note Chksum does not include SOF
318 +-------+---------------+-------+
319 bit 0 7 8 11 12 15 16
320
321 */
322
323 static int state;
324
325 /* decode States */
326 #define STATE_SOF 0 /* start of FRAME */
327 #define STATE_ID 1 /* state where we decode the ID & len */
328 #define STATE_DATA 2 /* state where we decode data */
329 #define STATE_EOF 3 /* state where we decode checksum or EOF */
330
331 static irqreturn_t h3600ts_interrupt(struct serio *serio, unsigned char data,
332 unsigned int flags, struct pt_regs *regs)
333 {
334 struct h3600_dev *ts = serio->private;
335
336 /*
337 * We have a new frame coming in.
338 */
339 switch (state) {
340 case STATE_SOF:
341 if (data == CHAR_SOF)
342 state = STATE_ID;
343 break;
344 case STATE_ID:
345 ts->event = (data & 0xf0) >> 4;
346 ts->len = (data & 0xf);
347 ts->idx = 0;
348 if (ts->event >= MAX_ID) {
349 state = STATE_SOF;
350 break;
351 }
352 ts->chksum = data;
353 state = (ts->len > 0) ? STATE_DATA : STATE_EOF;
354 break;
355 case STATE_DATA:
356 ts->chksum += data;
357 ts->buf[ts->idx]= data;
358 if(++ts->idx == ts->len)
359 state = STATE_EOF;
360 break;
361 case STATE_EOF:
362 state = STATE_SOF;
363 if (data == CHAR_EOF || data == ts->chksum)
364 h3600ts_process_packet(ts, regs);
365 break;
366 default:
367 printk("Error3\n");
368 break;
369 }
370
371 return IRQ_HANDLED;
372 }
373
374 /*
375 * h3600ts_connect() is the routine that is called when someone adds a
376 * new serio device. It looks whether it was registered as a H3600 touchscreen
377 * and if yes, registers it as an input device.
378 */
379 static void h3600ts_connect(struct serio *serio, struct serio_driver *drv)
380 {
381 struct h3600_dev *ts;
382
383 if (serio->type != (SERIO_RS232 | SERIO_H3600))
384 return;
385
386 if (!(ts = kmalloc(sizeof(struct h3600_dev), GFP_KERNEL)))
387 return;
388
389 memset(ts, 0, sizeof(struct h3600_dev));
390
391 init_input_dev(&ts->dev);
392
393 /* Device specific stuff */
394 set_GPIO_IRQ_edge(GPIO_BITSY_ACTION_BUTTON, GPIO_BOTH_EDGES);
395 set_GPIO_IRQ_edge(GPIO_BITSY_NPOWER_BUTTON, GPIO_RISING_EDGE);
396
397 if (request_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, action_button_handler,
398 SA_SHIRQ | SA_INTERRUPT | SA_SAMPLE_RANDOM,
399 "h3600_action", &ts->dev)) {
400 printk(KERN_ERR "h3600ts.c: Could not allocate Action Button IRQ!\n");
401 kfree(ts);
402 return;
403 }
404
405 if (request_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, npower_button_handler,
406 SA_SHIRQ | SA_INTERRUPT | SA_SAMPLE_RANDOM,
407 "h3600_suspend", &ts->dev)) {
408 free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, &ts->dev);
409 printk(KERN_ERR "h3600ts.c: Could not allocate Power Button IRQ!\n");
410 kfree(ts);
411 return;
412 }
413
414 /* Now we have things going we setup our input device */
415 ts->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_LED) | BIT(EV_PWR);
416 ts->dev.ledbit[0] = BIT(LED_SLEEP);
417 input_set_abs_params(&ts->dev, ABS_X, 60, 985, 0, 0);
418 input_set_abs_params(&ts->dev, ABS_Y, 35, 1024, 0, 0);
419
420 set_bit(KEY_RECORD, ts->dev.keybit);
421 set_bit(KEY_Q, ts->dev.keybit);
422 set_bit(KEY_PROG1, ts->dev.keybit);
423 set_bit(KEY_PROG2, ts->dev.keybit);
424 set_bit(KEY_PROG3, ts->dev.keybit);
425 set_bit(KEY_UP, ts->dev.keybit);
426 set_bit(KEY_RIGHT, ts->dev.keybit);
427 set_bit(KEY_LEFT, ts->dev.keybit);
428 set_bit(KEY_DOWN, ts->dev.keybit);
429 set_bit(KEY_ENTER, ts->dev.keybit);
430 ts->dev.keybit[LONG(BTN_TOUCH)] |= BIT(BTN_TOUCH);
431 ts->dev.keybit[LONG(KEY_SUSPEND)] |= BIT(KEY_SUSPEND);
432
433 ts->serio = serio;
434 serio->private = ts;
435
436 sprintf(ts->phys, "%s/input0", serio->phys);
437
438 ts->dev.event = h3600ts_event;
439 ts->dev.private = ts;
440 ts->dev.name = h3600_name;
441 ts->dev.phys = ts->phys;
442 ts->dev.id.bustype = BUS_RS232;
443 ts->dev.id.vendor = SERIO_H3600;
444 ts->dev.id.product = 0x0666; /* FIXME !!! We can ask the hardware */
445 ts->dev.id.version = 0x0100;
446
447 if (serio_open(serio, drv)) {
448 free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, ts);
449 free_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, ts);
450 kfree(ts);
451 return;
452 }
453
454 //h3600_flite_control(1, 25); /* default brightness */
455 #ifdef CONFIG_PM
456 ts->pm_dev = pm_register(PM_ILLUMINATION_DEV, PM_SYS_LIGHT,
457 h3600ts_pm_callback);
458 printk("registered pm callback\n");
459 #endif
460 input_register_device(&ts->dev);
461
462 printk(KERN_INFO "input: %s on %s\n", h3600_name, serio->phys);
463 }
464
465 /*
466 * h3600ts_disconnect() is the opposite of h3600ts_connect()
467 */
468
469 static void h3600ts_disconnect(struct serio *serio)
470 {
471 struct h3600_dev *ts = serio->private;
472
473 free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, &ts->dev);
474 free_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, &ts->dev);
475 input_unregister_device(&ts->dev);
476 serio_close(serio);
477 kfree(ts);
478 }
479
480 /*
481 * The serio device structure.
482 */
483
484 static struct serio_driver h3600ts_drv = {
485 .driver = {
486 .name = "h3600ts",
487 },
488 .description = DRIVER_DESC,
489 .interrupt = h3600ts_interrupt,
490 .connect = h3600ts_connect,
491 .disconnect = h3600ts_disconnect,
492 };
493
494 /*
495 * The functions for inserting/removing us as a module.
496 */
497
498 static int __init h3600ts_init(void)
499 {
500 serio_register_driver(&h3600ts_drv);
501 return 0;
502 }
503
504 static void __exit h3600ts_exit(void)
505 {
506 serio_unregister_driver(&h3600ts_drv);
507 }
508
509 module_init(h3600ts_init);
510 module_exit(h3600ts_exit);
511
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