1 /*- 2 * Copyright (C) 2016 Oleksandr Tymoshenko <gonzo@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/bus.h> 34 #include <sys/cpu.h> 35 #include <sys/kernel.h> 36 #include <sys/lock.h> 37 #include <sys/malloc.h> 38 #include <sys/module.h> 39 #include <sys/mutex.h> 40 #include <sys/condvar.h> 41 #include <sys/sysctl.h> 42 #include <sys/selinfo.h> 43 #include <sys/poll.h> 44 #include <sys/uio.h> 45 #include <sys/conf.h> 46 47 #include <vm/vm.h> 48 #include <vm/pmap.h> 49 50 #include <dev/ofw/ofw_bus.h> 51 #include <dev/ofw/ofw_bus_subr.h> 52 53 #include <dev/evdev/input.h> 54 #include <dev/evdev/evdev.h> 55 56 #include <machine/bus.h> 57 #include <machine/cpu.h> 58 #include <machine/intr.h> 59 60 #include <arm/broadcom/bcm2835/bcm2835_mbox.h> 61 #include <arm/broadcom/bcm2835/bcm2835_mbox_prop.h> 62 #include <arm/broadcom/bcm2835/bcm2835_vcbus.h> 63 64 #include "mbox_if.h" 65 66 #ifdef DEBUG 67 #define DPRINTF(fmt, ...) do { \ 68 printf("%s:%u: ", __func__, __LINE__); \ 69 printf(fmt, ##__VA_ARGS__); \ 70 } while (0) 71 #else 72 #define DPRINTF(fmt, ...) 73 #endif 74 75 #define FT5406_LOCK(_sc) \ 76 mtx_lock(&(_sc)->sc_mtx) 77 #define FT5406_UNLOCK(_sc) \ 78 mtx_unlock(&(_sc)->sc_mtx) 79 #define FT5406_LOCK_INIT(_sc) \ 80 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \ 81 "ft5406", MTX_DEF) 82 #define FT5406_LOCK_DESTROY(_sc) \ 83 mtx_destroy(&_sc->sc_mtx); 84 #define FT5406_LOCK_ASSERT(_sc) \ 85 mtx_assert(&(_sc)->sc_mtx, MA_OWNED) 86 87 #define FT5406_DEVICE_MODE 0 88 #define FT5406_GESTURE_ID 1 89 #define FT5406_NUM_POINTS 2 90 #define FT5406_POINT_XH(n) (0 + 3 + (n)*6) 91 #define FT5406_POINT_XL(n) (1 + 3 + (n)*6) 92 #define FT5406_POINT_YH(n) (2 + 3 + (n)*6) 93 #define FT5406_POINT_YL(n) (3 + 3 + (n)*6) 94 #define FT5406_WINDOW_SIZE 64 95 96 #define GET_NUM_POINTS(buf) (buf[FT5406_NUM_POINTS]) 97 #define GET_X(buf, n) (((buf[FT5406_POINT_XH(n)] & 0xf) << 8) | \ 98 (buf[FT5406_POINT_XL(n)])) 99 #define GET_Y(buf, n) (((buf[FT5406_POINT_YH(n)] & 0xf) << 8) | \ 100 (buf[FT5406_POINT_YL(n)])) 101 #define GET_TOUCH_ID(buf, n) ((buf[FT5406_POINT_YH(n)] >> 4) & 0xf) 102 103 #define NO_POINTS 99 104 #define SCREEN_WIDTH 800 105 #define SCREEN_HEIGHT 480 106 #define SCREEN_WIDTH_MM 155 107 #define SCREEN_HEIGHT_MM 86 108 #define SCREEN_RES_X (SCREEN_WIDTH / SCREEN_WIDTH_MM) 109 #define SCREEN_RES_Y (SCREEN_HEIGHT / SCREEN_HEIGHT_MM) 110 #define MAX_TOUCH_ID (10 - 1) 111 112 struct ft5406ts_softc { 113 device_t sc_dev; 114 struct mtx sc_mtx; 115 int sc_tick; 116 struct callout sc_callout; 117 118 /* mbox buffer (mapped to KVA) */ 119 uint8_t *touch_buf; 120 121 /* initial hook for waiting mbox intr */ 122 struct intr_config_hook sc_init_hook; 123 124 struct evdev_dev *sc_evdev; 125 126 uint8_t sc_window[FT5406_WINDOW_SIZE]; 127 }; 128 129 static evdev_open_t ft5406ts_ev_open; 130 static evdev_close_t ft5406ts_ev_close; 131 132 static const struct evdev_methods ft5406ts_evdev_methods = { 133 .ev_open = &ft5406ts_ev_open, 134 .ev_close = &ft5406ts_ev_close, 135 }; 136 137 static void 138 ft5406ts_callout(void *data) 139 { 140 struct ft5406ts_softc *sc = (struct ft5406ts_softc *)data; 141 int points; 142 int id, i, x, y; 143 144 FT5406_LOCK_ASSERT(sc); 145 146 memcpy(sc->sc_window, sc->touch_buf, FT5406_WINDOW_SIZE); 147 sc->touch_buf[FT5406_NUM_POINTS] = NO_POINTS; 148 149 points = GET_NUM_POINTS(sc->sc_window); 150 /* 151 * No update from VC - do nothing. 152 */ 153 if (points == NO_POINTS) 154 goto out; 155 156 for (i = 0; i < points; i++) { 157 id = GET_TOUCH_ID(sc->sc_window, i); 158 x = GET_X(sc->sc_window, i); 159 y = GET_Y(sc->sc_window, i); 160 161 if (id > MAX_TOUCH_ID) { 162 device_printf(sc->sc_dev, "bad touch id: %d", id); 163 continue; 164 } 165 evdev_push_event(sc->sc_evdev, EV_ABS, ABS_MT_SLOT, id); 166 evdev_push_event(sc->sc_evdev, EV_ABS, ABS_MT_TRACKING_ID, id); 167 evdev_push_event(sc->sc_evdev, EV_ABS, ABS_MT_POSITION_X, x); 168 evdev_push_event(sc->sc_evdev, EV_ABS, ABS_MT_POSITION_Y, y); 169 } 170 evdev_sync(sc->sc_evdev); 171 out: 172 callout_reset(&sc->sc_callout, sc->sc_tick, ft5406ts_callout, sc); 173 } 174 175 static void 176 ft5406ts_ev_close(struct evdev_dev *evdev, void *data) 177 { 178 struct ft5406ts_softc *sc = (struct ft5406ts_softc *)data; 179 180 FT5406_LOCK_ASSERT(sc); 181 182 callout_stop(&sc->sc_callout); 183 } 184 185 static int 186 ft5406ts_ev_open(struct evdev_dev *evdev, void *data) 187 { 188 struct ft5406ts_softc *sc = (struct ft5406ts_softc *)data; 189 190 FT5406_LOCK_ASSERT(sc); 191 192 callout_reset(&sc->sc_callout, sc->sc_tick, ft5406ts_callout, sc); 193 194 return (0); 195 } 196 197 static void 198 ft5406ts_init(void *arg) 199 { 200 struct ft5406ts_softc *sc = arg; 201 struct bcm2835_mbox_tag_touchbuf msg; 202 uint32_t touchbuf; 203 int err; 204 205 /* release this hook (continue boot) */ 206 config_intrhook_disestablish(&sc->sc_init_hook); 207 208 memset(&msg, 0, sizeof(msg)); 209 msg.hdr.buf_size = sizeof(msg); 210 msg.hdr.code = BCM2835_MBOX_CODE_REQ; 211 msg.tag_hdr.tag = BCM2835_MBOX_TAG_GET_TOUCHBUF; 212 msg.tag_hdr.val_buf_size = sizeof(msg.body); 213 msg.tag_hdr.val_len = sizeof(msg.body); 214 msg.end_tag = 0; 215 216 /* call mailbox property */ 217 err = bcm2835_mbox_property(&msg, sizeof(msg)); 218 if (err) { 219 device_printf(sc->sc_dev, "failed to get touchbuf address\n"); 220 return; 221 } 222 223 if (msg.body.resp.address == 0) { 224 device_printf(sc->sc_dev, "touchscreen not detected\n"); 225 return; 226 } 227 228 touchbuf = VCBUS_TO_PHYS(msg.body.resp.address); 229 sc->touch_buf = (uint8_t*)pmap_mapdev(touchbuf, FT5406_WINDOW_SIZE); 230 231 /* 60Hz */ 232 sc->sc_tick = hz * 17 / 1000; 233 if (sc->sc_tick == 0) 234 sc->sc_tick = 1; 235 236 sc->sc_evdev = evdev_alloc(); 237 evdev_set_name(sc->sc_evdev, device_get_desc(sc->sc_dev)); 238 evdev_set_phys(sc->sc_evdev, device_get_nameunit(sc->sc_dev)); 239 evdev_set_id(sc->sc_evdev, BUS_HOST, 0, 0, 0); 240 evdev_set_methods(sc->sc_evdev, sc, &ft5406ts_evdev_methods); 241 evdev_set_flag(sc->sc_evdev, EVDEV_FLAG_MT_STCOMPAT); 242 evdev_set_flag(sc->sc_evdev, EVDEV_FLAG_MT_AUTOREL); 243 evdev_support_prop(sc->sc_evdev, INPUT_PROP_DIRECT); 244 evdev_support_event(sc->sc_evdev, EV_SYN); 245 evdev_support_event(sc->sc_evdev, EV_ABS); 246 247 evdev_support_abs(sc->sc_evdev, ABS_MT_SLOT, 0, 0, 248 MAX_TOUCH_ID, 0, 0, 0); 249 evdev_support_abs(sc->sc_evdev, ABS_MT_TRACKING_ID, 0, -1, 250 MAX_TOUCH_ID, 0, 0, 0); 251 evdev_support_abs(sc->sc_evdev, ABS_MT_POSITION_X, 0, 0, 252 SCREEN_WIDTH, 0, 0, SCREEN_RES_X); 253 evdev_support_abs(sc->sc_evdev, ABS_MT_POSITION_Y, 0, 0, 254 SCREEN_HEIGHT, 0, 0, SCREEN_RES_Y); 255 256 err = evdev_register_mtx(sc->sc_evdev, &sc->sc_mtx); 257 if (err) { 258 evdev_free(sc->sc_evdev); 259 sc->sc_evdev = NULL; /* Avoid double free */ 260 return; 261 } 262 263 sc->touch_buf[FT5406_NUM_POINTS] = NO_POINTS; 264 callout_init_mtx(&sc->sc_callout, &sc->sc_mtx, 0); 265 } 266 267 static int 268 ft5406ts_probe(device_t dev) 269 { 270 271 if (!ofw_bus_is_compatible(dev, "rpi,rpi-ft5406")) 272 return (ENXIO); 273 274 device_set_desc(dev, "FT5406 touchscreen (VC memory interface)"); 275 276 return (BUS_PROBE_DEFAULT); 277 } 278 279 static int 280 ft5406ts_attach(device_t dev) 281 { 282 struct ft5406ts_softc *sc; 283 284 /* set self dev */ 285 sc = device_get_softc(dev); 286 sc->sc_dev = dev; 287 288 /* register callback for using mbox when interrupts are enabled */ 289 sc->sc_init_hook.ich_func = ft5406ts_init; 290 sc->sc_init_hook.ich_arg = sc; 291 292 FT5406_LOCK_INIT(sc); 293 294 if (config_intrhook_establish(&sc->sc_init_hook) != 0) { 295 device_printf(dev, "config_intrhook_establish failed\n"); 296 FT5406_LOCK_DESTROY(sc); 297 return (ENOMEM); 298 } 299 300 return (0); 301 } 302 303 static int 304 ft5406ts_detach(device_t dev) 305 { 306 struct ft5406ts_softc *sc; 307 308 sc = device_get_softc(dev); 309 310 evdev_free(sc->sc_evdev); 311 312 FT5406_LOCK_DESTROY(sc); 313 314 return (0); 315 } 316 317 static device_method_t ft5406ts_methods[] = { 318 /* Device interface */ 319 DEVMETHOD(device_probe, ft5406ts_probe), 320 DEVMETHOD(device_attach, ft5406ts_attach), 321 DEVMETHOD(device_detach, ft5406ts_detach), 322 323 DEVMETHOD_END 324 }; 325 326 static devclass_t ft5406ts_devclass; 327 static driver_t ft5406ts_driver = { 328 "ft5406ts", 329 ft5406ts_methods, 330 sizeof(struct ft5406ts_softc), 331 }; 332 333 DRIVER_MODULE(ft5406ts, ofwbus, ft5406ts_driver, ft5406ts_devclass, 0, 0); 334 MODULE_DEPEND(ft5406ts, evdev, 1, 1, 1); 335