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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); |