ztp.c revision 1.6 1 /* $NetBSD: ztp.c,v 1.6 2009/01/29 12:28:15 nonaka Exp $ */
2 /* $OpenBSD: zts.c,v 1.9 2005/04/24 18:55:49 uwe Exp $ */
3
4 /*
5 * Copyright (c) 2005 Dale Rahn <drahn (at) openbsd.org>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #include <sys/cdefs.h>
21 __KERNEL_RCSID(0, "$NetBSD: ztp.c,v 1.6 2009/01/29 12:28:15 nonaka Exp $");
22
23 #include "lcd.h"
24
25 #include <sys/types.h>
26 #include <sys/param.h>
27 #include <sys/systm.h>
28 #include <sys/device.h>
29 #include <sys/malloc.h>
30 #include <sys/kernel.h>
31 #include <sys/callout.h>
32
33 #include <dev/wscons/wsconsio.h>
34 #include <dev/wscons/wsmousevar.h>
35 #include <dev/wscons/wsdisplayvar.h>
36
37 #include <dev/hpc/hpcfbio.h> /* XXX: for tpctl */
38 #include <dev/hpc/hpctpanelvar.h>
39
40 #include <arm/xscale/pxa2x0cpu.h>
41 #include <arm/xscale/pxa2x0reg.h>
42 #include <arm/xscale/pxa2x0var.h>
43 #include <arm/xscale/xscalereg.h>
44 #include <arm/xscale/pxa2x0_lcd.h>
45 #include <arm/xscale/pxa2x0_gpio.h>
46
47 #include <zaurus/dev/zsspvar.h>
48
49 #ifdef ZTP_DEBUG
50 #define DPRINTF(s) printf s
51 #else
52 #define DPRINTF(s)
53 #endif
54
55 /*
56 * ADS784x touch screen controller
57 */
58 #define ADSCTRL_PD0_SH 0 /* PD0 bit */
59 #define ADSCTRL_PD1_SH 1 /* PD1 bit */
60 #define ADSCTRL_DFR_SH 2 /* SER/DFR bit */
61 #define ADSCTRL_MOD_SH 3 /* Mode bit */
62 #define ADSCTRL_ADR_SH 4 /* Address setting */
63 #define ADSCTRL_STS_SH 7 /* Start bit */
64
65 #define GPIO_TP_INT_C3K 11
66 #define GPIO_HSYNC_C3K 22
67
68 #define POLL_TIMEOUT_RATE0 ((hz * 150)/1000)
69 #define POLL_TIMEOUT_RATE1 (hz / 100) /* XXX every tick */
70
71 #define CCNT_HS_400_VGA_C3K 6250 /* 15.024us */
72
73 /* XXX need to ask zaurus_lcd.c for the screen dimension */
74 #define CURRENT_DISPLAY (&sharp_zaurus_C3000)
75 extern const struct lcd_panel_geometry sharp_zaurus_C3000;
76
77 /* Settable via sysctl. */
78 int ztp_rawmode;
79
80 static const struct wsmouse_calibcoords ztp_default_calib = {
81 0, 0, 479, 639, /* minx, miny, maxx, maxy */
82 5, /* samplelen */
83 {
84 { 1929, 2021, 240, 320 }, /* rawx, rawy, x, y */
85 { 545, 3464, 48, 64 },
86 { 3308, 3452, 48, 576 },
87 { 2854, 768, 432, 576 },
88 { 542, 593, 432, 64 }
89 }
90 };
91
92 struct ztp_pos {
93 int x;
94 int y;
95 int z; /* touch pressure */
96 };
97
98 struct ztp_softc {
99 device_t sc_dev;
100 struct callout sc_tp_poll;
101 void *sc_gh;
102 void *sc_powerhook;
103 int sc_enabled;
104 int sc_buttons; /* button emulation ? */
105 struct device *sc_wsmousedev;
106 struct ztp_pos sc_oldpos;
107 int sc_resx;
108 int sc_resy;
109 struct tpcalib_softc sc_tpcalib;
110 };
111
112 static int ztp_match(device_t, cfdata_t, void *);
113 static void ztp_attach(device_t, device_t, void *);
114
115 CFATTACH_DECL_NEW(ztp, sizeof(struct ztp_softc),
116 ztp_match, ztp_attach, NULL, NULL);
117
118 static int ztp_enable(void *);
119 static void ztp_disable(void *);
120 static void ztp_power(int, void *);
121 static void ztp_poll(void *);
122 static int ztp_irq(void *);
123 static int ztp_ioctl(void *, u_long, void *, int, struct lwp *);
124
125 static const struct wsmouse_accessops ztp_accessops = {
126 ztp_enable,
127 ztp_ioctl,
128 ztp_disable
129 };
130
131 static int
132 ztp_match(device_t parent, cfdata_t cf, void *aux)
133 {
134
135 return 1;
136 }
137
138 static void
139 ztp_attach(device_t parent, device_t self, void *aux)
140 {
141 struct ztp_softc *sc = device_private(self);
142 struct wsmousedev_attach_args a;
143
144 sc->sc_dev = self;
145
146 aprint_normal("\n");
147 aprint_naive("\n");
148
149 callout_init(&sc->sc_tp_poll, 0);
150 callout_setfunc(&sc->sc_tp_poll, ztp_poll, sc);
151
152 /* Initialize ADS7846 Difference Reference mode */
153 (void)zssp_ic_send(ZSSP_IC_ADS7846,
154 (1<<ADSCTRL_ADR_SH) | (1<<ADSCTRL_STS_SH));
155 delay(5000);
156 (void)zssp_ic_send(ZSSP_IC_ADS7846,
157 (3<<ADSCTRL_ADR_SH) | (1<<ADSCTRL_STS_SH));
158 delay(5000);
159 (void)zssp_ic_send(ZSSP_IC_ADS7846,
160 (4<<ADSCTRL_ADR_SH) | (1<<ADSCTRL_STS_SH));
161 delay(5000);
162 (void)zssp_ic_send(ZSSP_IC_ADS7846,
163 (5<<ADSCTRL_ADR_SH) | (1<<ADSCTRL_STS_SH));
164 delay(5000);
165
166 a.accessops = &ztp_accessops;
167 a.accesscookie = sc;
168
169 #if NLCD > 0
170 sc->sc_resx = CURRENT_DISPLAY->panel_height;
171 sc->sc_resy = CURRENT_DISPLAY->panel_width;
172 #else
173 sc->sc_resx = 480; /* XXX */
174 sc->sc_resy = 640; /* XXX */
175 #endif
176
177 sc->sc_wsmousedev = config_found(self, &a, wsmousedevprint);
178
179 /* Initialize calibration, set default parameters. */
180 tpcalib_init(&sc->sc_tpcalib);
181 tpcalib_ioctl(&sc->sc_tpcalib, WSMOUSEIO_SCALIBCOORDS,
182 __UNCONST(&ztp_default_calib), 0, 0);
183 }
184
185 static int
186 ztp_enable(void *v)
187 {
188 struct ztp_softc *sc = (struct ztp_softc *)v;
189
190 DPRINTF(("%s: ztp_enable()\n", device_xname(sc->sc_dev)));
191
192 if (sc->sc_enabled) {
193 DPRINTF(("%s: already enabled\n", device_xname(sc->sc_dev)));
194 return EBUSY;
195 }
196
197 callout_stop(&sc->sc_tp_poll);
198
199 sc->sc_powerhook = powerhook_establish(device_xname(sc->sc_dev),
200 ztp_power, sc);
201 if (sc->sc_powerhook == NULL) {
202 aprint_error_dev(sc->sc_dev, "couldn't establish powerhook\n");
203 return ENOMEM;
204 }
205
206 pxa2x0_gpio_set_function(GPIO_TP_INT_C3K, GPIO_IN);
207
208 /* XXX */
209 if (sc->sc_gh == NULL) {
210 sc->sc_gh = pxa2x0_gpio_intr_establish(GPIO_TP_INT_C3K,
211 IST_EDGE_FALLING, IPL_TTY, ztp_irq, sc);
212 } else {
213 pxa2x0_gpio_intr_unmask(sc->sc_gh);
214 }
215
216 /* enable interrupts */
217 sc->sc_enabled = 1;
218 sc->sc_buttons = 0;
219
220 return 0;
221 }
222
223 static void
224 ztp_disable(void *v)
225 {
226 struct ztp_softc *sc = (struct ztp_softc *)v;
227
228 DPRINTF(("%s: ztp_disable()\n", device_xname(sc->sc_dev)));
229
230 callout_stop(&sc->sc_tp_poll);
231
232 if (sc->sc_powerhook != NULL) {
233 powerhook_disestablish(sc->sc_powerhook);
234 sc->sc_powerhook = NULL;
235 }
236
237 if (sc->sc_gh) {
238 #if 0
239 pxa2x0_gpio_intr_disestablish(sc->sc_gh);
240 sc->sc_gh = NULL;
241 #else
242 pxa2x0_gpio_intr_mask(sc->sc_gh);
243 #endif
244 }
245
246 /* disable interrupts */
247 sc->sc_enabled = 0;
248 }
249
250 static void
251 ztp_power(int why, void *v)
252 {
253 struct ztp_softc *sc = (struct ztp_softc *)v;
254
255 DPRINTF(("%s: ztp_power()\n", device_xname(sc->sc_dev)));
256
257 switch (why) {
258 case PWR_STANDBY:
259 case PWR_SUSPEND:
260 sc->sc_enabled = 0;
261 #if 0
262 pxa2x0_gpio_intr_disestablish(sc->sc_gh);
263 #endif
264 callout_stop(&sc->sc_tp_poll);
265
266 pxa2x0_gpio_intr_mask(sc->sc_gh);
267
268 /* Turn off reference voltage but leave ADC on. */
269 (void)zssp_ic_send(ZSSP_IC_ADS7846, (1 << ADSCTRL_PD1_SH) |
270 (1 << ADSCTRL_ADR_SH) | (1 << ADSCTRL_STS_SH));
271
272 pxa2x0_gpio_set_function(GPIO_TP_INT_C3K, GPIO_OUT | GPIO_SET);
273 break;
274
275 case PWR_RESUME:
276 pxa2x0_gpio_set_function(GPIO_TP_INT_C3K, GPIO_IN);
277 pxa2x0_gpio_intr_mask(sc->sc_gh);
278
279 /* Enable automatic low power mode. */
280 (void)zssp_ic_send(ZSSP_IC_ADS7846,
281 (4 << ADSCTRL_ADR_SH) | (1 << ADSCTRL_STS_SH));
282
283 #if 0
284 sc->sc_gh = pxa2x0_gpio_intr_establish(GPIO_TP_INT_C3K,
285 IST_EDGE_FALLING, IPL_TTY, ztp_irq, sc);
286 #else
287 pxa2x0_gpio_intr_unmask(sc->sc_gh);
288 #endif
289 sc->sc_enabled = 1;
290 break;
291 }
292 }
293
294 #define HSYNC() \
295 do { \
296 while (pxa2x0_gpio_get_bit(GPIO_HSYNC_C3K) == 0) \
297 continue; \
298 while (pxa2x0_gpio_get_bit(GPIO_HSYNC_C3K) != 0) \
299 continue; \
300 } while (/*CONSTCOND*/0)
301
302 static inline uint32_t pxa2x0_ccnt_enable(uint32_t);
303 static inline uint32_t pxa2x0_read_ccnt(void);
304 static uint32_t ztp_sync_ads784x(int, int, uint32_t);
305 static void ztp_sync_send(uint32_t);
306 static int ztp_readpos(struct ztp_pos *);
307
308 static inline uint32_t
309 pxa2x0_ccnt_enable(uint32_t reg)
310 {
311 uint32_t rv;
312
313 __asm volatile("mrc p14, 0, %0, c0, c1, 0" : "=r" (rv));
314 __asm volatile("mcr p14, 0, %0, c0, c1, 0" : : "r" (reg));
315
316 return rv;
317 }
318
319 static inline uint32_t
320 pxa2x0_read_ccnt(void)
321 {
322 uint32_t rv;
323
324 __asm volatile("mrc p14, 0, %0, c1, c1, 0" : "=r" (rv));
325
326 return rv;
327 }
328
329 /*
330 * Communicate synchronously with the ADS784x touch screen controller.
331 */
332 static uint32_t
333 ztp_sync_ads784x(int dorecv/* XXX */, int dosend/* XXX */, uint32_t cmd)
334 {
335 uint32_t ccen;
336 uint32_t rv = 0;
337
338 /* XXX poll hsync only if LCD is enabled */
339
340 /* start clock counter */
341 ccen = pxa2x0_ccnt_enable(PMNC_E);
342
343 HSYNC();
344
345 if (dorecv) {
346 /* read SSDR and disable ADS784x */
347 rv = zssp_ic_stop(ZSSP_IC_ADS7846);
348 }
349
350 if (dosend) {
351 ztp_sync_send(cmd);
352 }
353
354 /* stop clock counter */
355 pxa2x0_ccnt_enable(ccen);
356
357 return rv;
358 }
359
360 void
361 ztp_sync_send(uint32_t cmd)
362 {
363 volatile uint32_t base, now;
364 uint32_t tck;
365
366 /* XXX */
367 tck = CCNT_HS_400_VGA_C3K - 151;
368
369 /* send dummy command; discard SSDR */
370 (void)zssp_ic_send(ZSSP_IC_ADS7846, cmd);
371
372 /* wait for refresh */
373 HSYNC();
374
375 /* wait after refresh */
376 base = pxa2x0_read_ccnt();
377 now = pxa2x0_read_ccnt();
378 while ((now - base) < tck)
379 now = pxa2x0_read_ccnt();
380
381 /* send the actual command; keep ADS784x enabled */
382 zssp_ic_start(ZSSP_IC_ADS7846, cmd);
383 }
384
385 static int
386 ztp_readpos(struct ztp_pos *pos)
387 {
388 int cmd;
389 int t0, t1;
390 int down;
391
392 /* XXX */
393 pxa2x0_gpio_set_function(GPIO_HSYNC_C3K, GPIO_IN);
394
395 /* check that pen is down */
396 cmd = (1 << ADSCTRL_PD0_SH) | (1 << ADSCTRL_PD1_SH) |
397 (3 << ADSCTRL_ADR_SH) | (1 << ADSCTRL_STS_SH);
398 t0 = zssp_ic_send(ZSSP_IC_ADS7846, cmd);
399 DPRINTF(("ztp_readpos(): t0 = %d\n", t0));
400
401 down = (t0 >= 10);
402 if (down == 0)
403 goto out;
404
405 /* Y */
406 cmd = (1 << ADSCTRL_PD0_SH) | (1 << ADSCTRL_PD1_SH) |
407 (1 << ADSCTRL_ADR_SH) | (1 << ADSCTRL_STS_SH);
408 (void)ztp_sync_ads784x(0, 1, cmd);
409
410 /* Y */
411 cmd = (1 << ADSCTRL_PD0_SH) | (1 << ADSCTRL_PD1_SH) |
412 (1 << ADSCTRL_ADR_SH) | (1 << ADSCTRL_STS_SH);
413 (void)ztp_sync_ads784x(1, 1, cmd);
414
415 /* X */
416 cmd = (1 << ADSCTRL_PD0_SH) | (1 << ADSCTRL_PD1_SH) |
417 (5 << ADSCTRL_ADR_SH) | (1 << ADSCTRL_STS_SH);
418 pos->y = ztp_sync_ads784x(1, 1, cmd);
419 DPRINTF(("ztp_readpos(): y = %d\n", pos->y));
420
421 /* T0 */
422 cmd = (1 << ADSCTRL_PD0_SH) | (1 << ADSCTRL_PD1_SH) |
423 (3 << ADSCTRL_ADR_SH) | (1 << ADSCTRL_STS_SH);
424 pos->x = ztp_sync_ads784x(1, 1, cmd);
425 DPRINTF(("ztp_readpos(): x = %d\n", pos->x));
426
427 /* T1 */
428 cmd = (1 << ADSCTRL_PD0_SH) | (1 << ADSCTRL_PD1_SH) |
429 (4 << ADSCTRL_ADR_SH) | (1 << ADSCTRL_STS_SH);
430 t0 = ztp_sync_ads784x(1, 1, cmd);
431 t1 = ztp_sync_ads784x(1, 0, cmd);
432 DPRINTF(("ztp_readpos(): t0 = %d, t1 = %d\n", t0, t1));
433
434 /* check that pen is still down */
435 /* XXX pressure sensitivity varies with X or what? */
436 if (t0 == 0 || (pos->x * (t1 - t0) / t0) >= 15000)
437 down = 0;
438 pos->z = down;
439
440 out:
441 /* Enable automatic low power mode. */
442 cmd = (4 << ADSCTRL_ADR_SH) | (1 << ADSCTRL_STS_SH);
443 (void)zssp_ic_send(ZSSP_IC_ADS7846, cmd);
444
445 return down;
446 }
447
448 static void
449 ztp_poll(void *v)
450 {
451 int s;
452
453 s = spltty();
454 (void)ztp_irq(v);
455 splx(s);
456 }
457
458 static int
459 ztp_irq(void *v)
460 {
461 extern int zkbd_modstate;
462 struct ztp_softc *sc = (struct ztp_softc *)v;
463 struct ztp_pos tp = { 0, 0, 0 };
464 int pindown;
465 int down;
466 int x, y;
467 int s;
468
469 if (!sc->sc_enabled)
470 return 0;
471
472 s = splhigh();
473
474 pindown = pxa2x0_gpio_get_bit(GPIO_TP_INT_C3K) ? 0 : 1;
475 DPRINTF(("%s: pindown = %d\n", device_xname(sc->sc_dev), pindown));
476 if (pindown) {
477 pxa2x0_gpio_intr_mask(sc->sc_gh);
478 callout_schedule(&sc->sc_tp_poll, POLL_TIMEOUT_RATE1);
479 }
480
481 down = ztp_readpos(&tp);
482 DPRINTF(("%s: x = %d, y = %d, z = %d, down = %d\n",
483 device_xname(sc->sc_dev), tp.x, tp.y, tp.z, down));
484
485 if (!pindown) {
486 pxa2x0_gpio_intr_unmask(sc->sc_gh);
487 callout_schedule(&sc->sc_tp_poll, POLL_TIMEOUT_RATE0);
488 }
489 pxa2x0_gpio_clear_intr(GPIO_TP_INT_C3K);
490
491 splx(s);
492
493 if (down) {
494 if (!ztp_rawmode) {
495 tpcalib_trans(&sc->sc_tpcalib, tp.x, tp.y, &x, &y);
496 DPRINTF(("%s: x = %d, y = %d\n",
497 device_xname(sc->sc_dev), x, y));
498 tp.x = x;
499 tp.y = y;
500 }
501 }
502
503 if (zkbd_modstate != 0 && down) {
504 if (zkbd_modstate & (1 << 1)) {
505 /* Fn */
506 down = 2;
507 } else if (zkbd_modstate & (1 << 2)) {
508 /* 'Alt' */
509 down = 4;
510 }
511 }
512 if (!down) {
513 /* x/y values are not reliable when pen is up */
514 tp = sc->sc_oldpos;
515 }
516
517 if (down || sc->sc_buttons != down) {
518 wsmouse_input(sc->sc_wsmousedev, down, tp.x, tp.y, 0, 0,
519 WSMOUSE_INPUT_ABSOLUTE_X | WSMOUSE_INPUT_ABSOLUTE_Y);
520 sc->sc_buttons = down;
521 sc->sc_oldpos = tp;
522 }
523
524 return 1;
525 }
526
527 static int
528 ztp_ioctl(void *v, u_long cmd, void *data, int flag, struct lwp *l)
529 {
530 struct ztp_softc *sc = (struct ztp_softc *)v;
531 struct wsmouse_id *id;
532
533 switch (cmd) {
534 case WSMOUSEIO_GTYPE:
535 *(u_int *)data = WSMOUSE_TYPE_TPANEL;
536 return 0;
537
538 case WSMOUSEIO_GETID:
539 /*
540 * return unique ID string,
541 * "<vendor> <model> <serial number>"
542 */
543 id = (struct wsmouse_id *)data;
544 if (id->type != WSMOUSE_ID_TYPE_UIDSTR)
545 return EINVAL;
546 strlcpy(id->data, "Sharp SL-C3x00 SN000000", WSMOUSE_ID_MAXLEN);
547 id->length = strlen(id->data);
548 return 0;
549
550 case WSMOUSEIO_SCALIBCOORDS:
551 case WSMOUSEIO_GCALIBCOORDS:
552 return hpc_tpanel_ioctl(&sc->sc_tpcalib, cmd, data, flag, l);
553 }
554
555 return EPASSTHROUGH;
556 }
557