Bootlin logo

Elixir Cross Referencer

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
/*
 *  Copyright (c) 2001 "Crazy" James Simmons jsimmons@transvirtual.com
 *
 *  Sponsored by Transvirtual Technology.
 *
 *  Derived from the code in h3600_ts.[ch] by Charles Flynn
 */

/*
 * Driver for the h3600 Touch Screen and other Atmel controlled devices.
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Should you need to contact me, the author, you can do so by
 * e-mail - mail your message to <jsimmons@transvirtual.com>.
 */

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/init.h>
#include <linux/delay.h>

/* SA1100 serial defines */
#include <mach/hardware.h>
#include <mach/irqs.h>

#define DRIVER_DESC	"H3600 touchscreen driver"

MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/*
 * Definitions & global arrays.
 */

/* The start and end of frame characters SOF and EOF */
#define CHAR_SOF                0x02
#define CHAR_EOF                0x03
#define FRAME_OVERHEAD          3       /* CHAR_SOF,CHAR_EOF,LENGTH = 3 */

/*
        Atmel events and response IDs contained in frame.
        Programmer has no control over these numbers.
        TODO there are holes - specifically  1,7,0x0a
*/
#define VERSION_ID              0       /* Get Version (request/response) */
#define KEYBD_ID                2       /* Keyboard (event) */
#define TOUCHS_ID               3       /* Touch Screen (event)*/
#define EEPROM_READ_ID          4       /* (request/response) */
#define EEPROM_WRITE_ID         5       /* (request/response) */
#define THERMAL_ID              6       /* (request/response) */
#define NOTIFY_LED_ID           8       /* (request/response) */
#define BATTERY_ID              9       /* (request/response) */
#define SPI_READ_ID             0x0b    /* ( request/response) */
#define SPI_WRITE_ID            0x0c    /* ( request/response) */
#define FLITE_ID                0x0d    /* backlight ( request/response) */
#define STX_ID                  0xa1    /* extension pack status (req/resp) */

#define MAX_ID                  14

#define H3600_MAX_LENGTH 16
#define H3600_KEY 0xf

#define H3600_SCANCODE_RECORD	1	 /* 1 -> record button */
#define H3600_SCANCODE_CALENDAR 2	 /* 2 -> calendar */
#define H3600_SCANCODE_CONTACTS 3	 /* 3 -> contact */
#define H3600_SCANCODE_Q	4	 /* 4 -> Q button */
#define	H3600_SCANCODE_START	5	 /* 5 -> start menu */
#define	H3600_SCANCODE_UP	6	 /* 6 -> up */
#define H3600_SCANCODE_RIGHT	7	 /* 7 -> right */
#define H3600_SCANCODE_LEFT	8	 /* 8 -> left */
#define H3600_SCANCODE_DOWN	9	 /* 9 -> down */

/*
 * Per-touchscreen data.
 */
struct h3600_dev {
	struct input_dev *dev;
	struct serio *serio;
	unsigned char event;	/* event ID from packet */
	unsigned char chksum;
	unsigned char len;
	unsigned char idx;
	unsigned char buf[H3600_MAX_LENGTH];
	char phys[32];
};

static irqreturn_t action_button_handler(int irq, void *dev_id)
{
	int down = (GPLR & GPIO_BITSY_ACTION_BUTTON) ? 0 : 1;
	struct input_dev *dev = dev_id;

	input_report_key(dev, KEY_ENTER, down);
	input_sync(dev);

	return IRQ_HANDLED;
}

static irqreturn_t npower_button_handler(int irq, void *dev_id)
{
	int down = (GPLR & GPIO_BITSY_NPOWER_BUTTON) ? 0 : 1;
	struct input_dev *dev = dev_id;

	/*
	 * This interrupt is only called when we release the key. So we have
	 * to fake a key press.
	 */
	input_report_key(dev, KEY_SUSPEND, 1);
	input_report_key(dev, KEY_SUSPEND, down);
	input_sync(dev);

	return IRQ_HANDLED;
}

#ifdef CONFIG_PM

static int flite_brightness = 25;

enum flite_pwr {
	FLITE_PWR_OFF = 0,
	FLITE_PWR_ON = 1
};

/*
 * h3600_flite_power: enables or disables power to frontlight, using last bright */
unsigned int h3600_flite_power(struct input_dev *dev, enum flite_pwr pwr)
{
	unsigned char brightness = (pwr == FLITE_PWR_OFF) ? 0 : flite_brightness;
	struct h3600_dev *ts = input_get_drvdata(dev);

	/* Must be in this order */
	serio_write(ts->serio, 1);
	serio_write(ts->serio, pwr);
	serio_write(ts->serio, brightness);

	return 0;
}

#endif

/*
 * This function translates the native event packets to linux input event
 * packets. Some packets coming from serial are not touchscreen related. In
 * this case we send them off to be processed elsewhere.
 */
static void h3600ts_process_packet(struct h3600_dev *ts)
{
	struct input_dev *dev = ts->dev;
	static int touched = 0;
	int key, down = 0;

	switch (ts->event) {
		/*
		   Buttons - returned as a single byte
			7 6 5 4 3 2 1 0
			S x x x N N N N

		   S       switch state ( 0=pressed 1=released)
		   x       Unused.
		   NNNN    switch number 0-15

		   Note: This is true for non interrupt generated key events.
		*/
		case KEYBD_ID:
			down = (ts->buf[0] & 0x80) ? 0 : 1;

			switch (ts->buf[0] & 0x7f) {
				case H3600_SCANCODE_RECORD:
					key = KEY_RECORD;
					break;
				case H3600_SCANCODE_CALENDAR:
					key = KEY_PROG1;
                                        break;
				case H3600_SCANCODE_CONTACTS:
					key = KEY_PROG2;
					break;
				case H3600_SCANCODE_Q:
					key = KEY_Q;
					break;
				case H3600_SCANCODE_START:
					key = KEY_PROG3;
					break;
				case H3600_SCANCODE_UP:
					key = KEY_UP;
					break;
				case H3600_SCANCODE_RIGHT:
					key = KEY_RIGHT;
					break;
				case H3600_SCANCODE_LEFT:
					key = KEY_LEFT;
					break;
				case H3600_SCANCODE_DOWN:
					key = KEY_DOWN;
					break;
				default:
					key = 0;
			}
			if (key)
				input_report_key(dev, key, down);
			break;
		/*
		 * Native touchscreen event data is formatted as shown below:-
		 *
		 *      +-------+-------+-------+-------+
		 *      | Xmsb  | Xlsb  | Ymsb  | Ylsb  |
		 *      +-------+-------+-------+-------+
		 *       byte 0    1       2       3
		 */
		case TOUCHS_ID:
			if (!touched) {
				input_report_key(dev, BTN_TOUCH, 1);
				touched = 1;
			}

			if (ts->len) {
				unsigned short x, y;

				x = ts->buf[0]; x <<= 8; x += ts->buf[1];
				y = ts->buf[2]; y <<= 8; y += ts->buf[3];

				input_report_abs(dev, ABS_X, x);
				input_report_abs(dev, ABS_Y, y);
			} else {
				input_report_key(dev, BTN_TOUCH, 0);
				touched = 0;
			}
			break;
		default:
			/* Send a non input event elsewhere */
			break;
	}

	input_sync(dev);
}

/*
 * h3600ts_event() handles events from the input module.
 */
static int h3600ts_event(struct input_dev *dev, unsigned int type,
			 unsigned int code, int value)
{
#if 0
	struct h3600_dev *ts = input_get_drvdata(dev);

	switch (type) {
		case EV_LED: {
		//	serio_write(ts->serio, SOME_CMD);
			return 0;
		}
	}
	return -1;
#endif
	return 0;
}

/*
        Frame format
  byte    1       2               3              len + 4
        +-------+---------------+---------------+--=------------+
        |SOF    |id     |len    | len bytes     | Chksum        |
        +-------+---------------+---------------+--=------------+
  bit   0     7  8    11 12   15 16

        +-------+---------------+-------+
        |SOF    |id     |0      |Chksum | - Note Chksum does not include SOF
        +-------+---------------+-------+
  bit   0     7  8    11 12   15 16

*/

static int state;

/* decode States  */
#define STATE_SOF       0       /* start of FRAME */
#define STATE_ID        1       /* state where we decode the ID & len */
#define STATE_DATA      2       /* state where we decode data */
#define STATE_EOF       3       /* state where we decode checksum or EOF */

static irqreturn_t h3600ts_interrupt(struct serio *serio, unsigned char data,
                                     unsigned int flags)
{
	struct h3600_dev *ts = serio_get_drvdata(serio);

	/*
	 * We have a new frame coming in.
	 */
	switch (state) {
		case STATE_SOF:
			if (data == CHAR_SOF)
				state = STATE_ID;
			break;
		case STATE_ID:
			ts->event = (data & 0xf0) >> 4;
			ts->len = (data & 0xf);
			ts->idx = 0;
			if (ts->event >= MAX_ID) {
				state = STATE_SOF;
				break;
			}
			ts->chksum = data;
			state = (ts->len > 0) ? STATE_DATA : STATE_EOF;
			break;
		case STATE_DATA:
			ts->chksum += data;
			ts->buf[ts->idx]= data;
			if (++ts->idx == ts->len)
				state = STATE_EOF;
			break;
		case STATE_EOF:
			state = STATE_SOF;
			if (data == CHAR_EOF || data == ts->chksum)
				h3600ts_process_packet(ts);
			break;
		default:
			printk("Error3\n");
			break;
	}

	return IRQ_HANDLED;
}

/*
 * h3600ts_connect() is the routine that is called when someone adds a
 * new serio device that supports H3600 protocol and registers it as
 * an input device.
 */
static int h3600ts_connect(struct serio *serio, struct serio_driver *drv)
{
	struct h3600_dev *ts;
	struct input_dev *input_dev;
	int err;

	ts = kzalloc(sizeof(struct h3600_dev), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!ts || !input_dev) {
		err = -ENOMEM;
		goto fail1;
	}

	ts->serio = serio;
	ts->dev = input_dev;
	snprintf(ts->phys, sizeof(ts->phys), "%s/input0", serio->phys);

	input_dev->name = "H3600 TouchScreen";
	input_dev->phys = ts->phys;
	input_dev->id.bustype = BUS_RS232;
	input_dev->id.vendor = SERIO_H3600;
	input_dev->id.product = 0x0666;  /* FIXME !!! We can ask the hardware */
	input_dev->id.version = 0x0100;
	input_dev->dev.parent = &serio->dev;

	input_set_drvdata(input_dev, ts);

	input_dev->event = h3600ts_event;

	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) |
		BIT_MASK(EV_LED) | BIT_MASK(EV_PWR);
	input_dev->ledbit[0] = BIT_MASK(LED_SLEEP);
	input_set_abs_params(input_dev, ABS_X, 60, 985, 0, 0);
	input_set_abs_params(input_dev, ABS_Y, 35, 1024, 0, 0);

	set_bit(KEY_RECORD, input_dev->keybit);
	set_bit(KEY_Q, input_dev->keybit);
	set_bit(KEY_PROG1, input_dev->keybit);
	set_bit(KEY_PROG2, input_dev->keybit);
	set_bit(KEY_PROG3, input_dev->keybit);
	set_bit(KEY_UP, input_dev->keybit);
	set_bit(KEY_RIGHT, input_dev->keybit);
	set_bit(KEY_LEFT, input_dev->keybit);
	set_bit(KEY_DOWN, input_dev->keybit);
	set_bit(KEY_ENTER, input_dev->keybit);
	set_bit(KEY_SUSPEND, input_dev->keybit);
	set_bit(BTN_TOUCH, input_dev->keybit);

	/* Device specific stuff */
	set_GPIO_IRQ_edge(GPIO_BITSY_ACTION_BUTTON, GPIO_BOTH_EDGES);
	set_GPIO_IRQ_edge(GPIO_BITSY_NPOWER_BUTTON, GPIO_RISING_EDGE);

	if (request_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, action_button_handler,
			IRQF_SHARED | IRQF_DISABLED, "h3600_action", ts->dev)) {
		printk(KERN_ERR "h3600ts.c: Could not allocate Action Button IRQ!\n");
		err = -EBUSY;
		goto fail1;
	}

	if (request_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, npower_button_handler,
			IRQF_SHARED | IRQF_DISABLED, "h3600_suspend", ts->dev)) {
		printk(KERN_ERR "h3600ts.c: Could not allocate Power Button IRQ!\n");
		err = -EBUSY;
		goto fail2;
	}

	serio_set_drvdata(serio, ts);

	err = serio_open(serio, drv);
	if (err)
		goto fail3;

	//h3600_flite_control(1, 25);     /* default brightness */
	err = input_register_device(ts->dev);
	if (err)
		goto fail4;

	return 0;

fail4:	serio_close(serio);
fail3:	serio_set_drvdata(serio, NULL);
	free_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, ts->dev);
fail2:	free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, ts->dev);
fail1:	input_free_device(input_dev);
	kfree(ts);
	return err;
}

/*
 * h3600ts_disconnect() is the opposite of h3600ts_connect()
 */

static void h3600ts_disconnect(struct serio *serio)
{
	struct h3600_dev *ts = serio_get_drvdata(serio);

	free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, ts->dev);
	free_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, ts->dev);
	input_get_device(ts->dev);
	input_unregister_device(ts->dev);
	serio_close(serio);
	serio_set_drvdata(serio, NULL);
	input_put_device(ts->dev);
	kfree(ts);
}

/*
 * The serio driver structure.
 */

static struct serio_device_id h3600ts_serio_ids[] = {
	{
		.type	= SERIO_RS232,
		.proto	= SERIO_H3600,
		.id	= SERIO_ANY,
		.extra	= SERIO_ANY,
	},
	{ 0 }
};

MODULE_DEVICE_TABLE(serio, h3600ts_serio_ids);

static struct serio_driver h3600ts_drv = {
	.driver		= {
		.name	= "h3600ts",
	},
	.description	= DRIVER_DESC,
	.id_table	= h3600ts_serio_ids,
	.interrupt	= h3600ts_interrupt,
	.connect	= h3600ts_connect,
	.disconnect	= h3600ts_disconnect,
};

/*
 * The functions for inserting/removing us as a module.
 */

static int __init h3600ts_init(void)
{
	return serio_register_driver(&h3600ts_drv);
}

static void __exit h3600ts_exit(void)
{
	serio_unregister_driver(&h3600ts_drv);
}

module_init(h3600ts_init);
module_exit(h3600ts_exit);