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/param.h> 29 #include <sys/systm.h> 30 #include <sys/bus.h> 31 #include <sys/cpu.h> 32 #include <sys/kernel.h> 33 #include <sys/lock.h> 34 #include <sys/malloc.h> 35 #include <sys/module.h> 36 #include <sys/mutex.h> 37 #include <sys/condvar.h> 38 #include <sys/sysctl.h> 39 #include <sys/selinfo.h> 40 #include <sys/poll.h> 41 #include <sys/uio.h> 42 #include <sys/conf.h> 43 44 #include <vm/vm.h> 45 #include <vm/pmap.h> 46 47 #include <dev/ofw/ofw_bus.h> 48 #include <dev/ofw/ofw_bus_subr.h> 49 50 #include <dev/evdev/input.h> 51 #include <dev/evdev/evdev.h> 52 53 #include <machine/bus.h> 54 #include <machine/cpu.h> 55 #include <machine/intr.h> 56 57 #include <arm/broadcom/bcm2835/bcm2835_mbox.h> 58 #include <arm/broadcom/bcm2835/bcm2835_mbox_prop.h> 59 #include <arm/broadcom/bcm2835/bcm2835_vcbus.h> 60 61 #include "mbox_if.h" 62 63 #ifdef DEBUG 64 #define DPRINTF(fmt, ...) do { \ 65 printf("%s:%u: ", __func__, __LINE__); \ 66 printf(fmt, ##__VA_ARGS__); \ 67 } while (0) 68 #else 69 #define DPRINTF(fmt, ...) 70 #endif 71 72 #define FT5406_LOCK(_sc) \ 73 mtx_lock(&(_sc)->sc_mtx) 74 #define FT5406_UNLOCK(_sc) \ 75 mtx_unlock(&(_sc)->sc_mtx) 76 #define FT5406_LOCK_INIT(_sc) \ 77 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \ 78 "ft5406", MTX_DEF) 79 #define FT5406_LOCK_DESTROY(_sc) \ 80 mtx_destroy(&_sc->sc_mtx); 81 #define FT5406_LOCK_ASSERT(_sc) \ 82 mtx_assert(&(_sc)->sc_mtx, MA_OWNED) 83 84 #define FT5406_DEVICE_MODE 0 85 #define FT5406_GESTURE_ID 1 86 #define FT5406_NUM_POINTS 2 87 #define FT5406_POINT_XH(n) (0 + 3 + (n)*6) 88 #define FT5406_POINT_XL(n) (1 + 3 + (n)*6) 89 #define FT5406_POINT_YH(n) (2 + 3 + (n)*6) 90 #define FT5406_POINT_YL(n) (3 + 3 + (n)*6) 91 #define FT5406_WINDOW_SIZE 64 92 93 #define GET_NUM_POINTS(buf) (buf[FT5406_NUM_POINTS]) 94 #define GET_X(buf, n) (((buf[FT5406_POINT_XH(n)] & 0xf) << 8) | \ 95 (buf[FT5406_POINT_XL(n)])) 96 #define GET_Y(buf, n) (((buf[FT5406_POINT_YH(n)] & 0xf) << 8) | \ 97 (buf[FT5406_POINT_YL(n)])) 98 #define GET_TOUCH_ID(buf, n) ((buf[FT5406_POINT_YH(n)] >> 4) & 0xf) 99 100 #define NO_POINTS 99 101 #define SCREEN_WIDTH 800 102 #define SCREEN_HEIGHT 480 103 #define SCREEN_WIDTH_MM 155 104 #define SCREEN_HEIGHT_MM 86 105 #define SCREEN_RES_X (SCREEN_WIDTH / SCREEN_WIDTH_MM) 106 #define SCREEN_RES_Y (SCREEN_HEIGHT / SCREEN_HEIGHT_MM) 107 #define MAX_TOUCH_ID (10 - 1) 108 109 struct ft5406ts_softc { 110 device_t sc_dev; 111 struct mtx sc_mtx; 112 int sc_tick; 113 struct callout sc_callout; 114 115 /* mbox buffer (mapped to KVA) */ 116 uint8_t *touch_buf; 117 118 /* initial hook for waiting mbox intr */ 119 struct intr_config_hook sc_init_hook; 120 121 struct evdev_dev *sc_evdev; 122 123 uint8_t sc_window[FT5406_WINDOW_SIZE]; 124 }; 125 126 static evdev_open_t ft5406ts_ev_open; 127 static evdev_close_t ft5406ts_ev_close; 128 129 static const struct evdev_methods ft5406ts_evdev_methods = { 130 .ev_open = &ft5406ts_ev_open, 131 .ev_close = &ft5406ts_ev_close, 132 }; 133 134 static void 135 ft5406ts_callout(void *data) 136 { 137 struct ft5406ts_softc *sc = (struct ft5406ts_softc *)data; 138 int points; 139 int id, i, x, y; 140 141 FT5406_LOCK_ASSERT(sc); 142 143 memcpy(sc->sc_window, sc->touch_buf, FT5406_WINDOW_SIZE); 144 sc->touch_buf[FT5406_NUM_POINTS] = NO_POINTS; 145 146 points = GET_NUM_POINTS(sc->sc_window); 147 /* 148 * No update from VC - do nothing. 149 */ 150 if (points == NO_POINTS) 151 goto out; 152 153 for (i = 0; i < points; i++) { 154 id = GET_TOUCH_ID(sc->sc_window, i); 155 x = GET_X(sc->sc_window, i); 156 y = GET_Y(sc->sc_window, i); 157 158 if (id > MAX_TOUCH_ID) { 159 device_printf(sc->sc_dev, "bad touch id: %d", id); 160 continue; 161 } 162 evdev_push_event(sc->sc_evdev, EV_ABS, ABS_MT_SLOT, id); 163 evdev_push_event(sc->sc_evdev, EV_ABS, ABS_MT_TRACKING_ID, id); 164 evdev_push_event(sc->sc_evdev, EV_ABS, ABS_MT_POSITION_X, x); 165 evdev_push_event(sc->sc_evdev, EV_ABS, ABS_MT_POSITION_Y, y); 166 } 167 evdev_sync(sc->sc_evdev); 168 out: 169 callout_reset(&sc->sc_callout, sc->sc_tick, ft5406ts_callout, sc); 170 } 171 172 static int 173 ft5406ts_ev_close(struct evdev_dev *evdev) 174 { 175 struct ft5406ts_softc *sc = evdev_get_softc(evdev); 176 177 FT5406_LOCK_ASSERT(sc); 178 179 callout_stop(&sc->sc_callout); 180 181 return (0); 182 } 183 184 static int 185 ft5406ts_ev_open(struct evdev_dev *evdev) 186 { 187 struct ft5406ts_softc *sc = evdev_get_softc(evdev); 188 189 FT5406_LOCK_ASSERT(sc); 190 191 callout_reset(&sc->sc_callout, sc->sc_tick, ft5406ts_callout, sc); 192 193 return (0); 194 } 195 196 static void 197 ft5406ts_init(void *arg) 198 { 199 struct ft5406ts_softc *sc = arg; 200 struct bcm2835_mbox_tag_touchbuf msg; 201 uint32_t touchbuf; 202 int err; 203 204 /* release this hook (continue boot) */ 205 config_intrhook_disestablish(&sc->sc_init_hook); 206 207 memset(&msg, 0, sizeof(msg)); 208 msg.hdr.buf_size = sizeof(msg); 209 msg.hdr.code = BCM2835_MBOX_CODE_REQ; 210 msg.tag_hdr.tag = BCM2835_MBOX_TAG_GET_TOUCHBUF; 211 msg.tag_hdr.val_buf_size = sizeof(msg.body); 212 msg.tag_hdr.val_len = sizeof(msg.body); 213 msg.end_tag = 0; 214 215 /* call mailbox property */ 216 err = bcm2835_mbox_property(&msg, sizeof(msg)); 217 if (err) { 218 device_printf(sc->sc_dev, "failed to get touchbuf address\n"); 219 return; 220 } 221 222 if (msg.body.resp.address == 0) { 223 device_printf(sc->sc_dev, "touchscreen not detected\n"); 224 return; 225 } 226 227 touchbuf = VCBUS_TO_ARMC(msg.body.resp.address); 228 sc->touch_buf = (uint8_t*)pmap_mapdev(touchbuf, FT5406_WINDOW_SIZE); 229 230 /* 60Hz */ 231 sc->sc_tick = hz * 17 / 1000; 232 if (sc->sc_tick == 0) 233 sc->sc_tick = 1; 234 235 sc->sc_evdev = evdev_alloc(); 236 evdev_set_name(sc->sc_evdev, device_get_desc(sc->sc_dev)); 237 evdev_set_phys(sc->sc_evdev, device_get_nameunit(sc->sc_dev)); 238 evdev_set_id(sc->sc_evdev, BUS_HOST, 0, 0, 0); 239 evdev_set_methods(sc->sc_evdev, sc, &ft5406ts_evdev_methods); 240 evdev_set_flag(sc->sc_evdev, EVDEV_FLAG_MT_STCOMPAT); 241 evdev_set_flag(sc->sc_evdev, EVDEV_FLAG_MT_AUTOREL); 242 evdev_support_prop(sc->sc_evdev, INPUT_PROP_DIRECT); 243 evdev_support_event(sc->sc_evdev, EV_SYN); 244 evdev_support_event(sc->sc_evdev, EV_ABS); 245 246 evdev_support_abs(sc->sc_evdev, ABS_MT_SLOT, 0, 247 MAX_TOUCH_ID, 0, 0, 0); 248 evdev_support_abs(sc->sc_evdev, ABS_MT_TRACKING_ID, -1, 249 MAX_TOUCH_ID, 0, 0, 0); 250 evdev_support_abs(sc->sc_evdev, ABS_MT_POSITION_X, 0, 251 SCREEN_WIDTH, 0, 0, SCREEN_RES_X); 252 evdev_support_abs(sc->sc_evdev, ABS_MT_POSITION_Y, 0, 253 SCREEN_HEIGHT, 0, 0, SCREEN_RES_Y); 254 255 err = evdev_register_mtx(sc->sc_evdev, &sc->sc_mtx); 256 if (err) { 257 evdev_free(sc->sc_evdev); 258 sc->sc_evdev = NULL; /* Avoid double free */ 259 return; 260 } 261 262 sc->touch_buf[FT5406_NUM_POINTS] = NO_POINTS; 263 callout_init_mtx(&sc->sc_callout, &sc->sc_mtx, 0); 264 } 265 266 static int 267 ft5406ts_probe(device_t dev) 268 { 269 270 if (!ofw_bus_is_compatible(dev, "raspberrypi,firmware-ts")) 271 return (ENXIO); 272 273 device_set_desc(dev, "FT5406 touchscreen (VC memory interface)"); 274 275 return (BUS_PROBE_DEFAULT); 276 } 277 278 static int 279 ft5406ts_attach(device_t dev) 280 { 281 struct ft5406ts_softc *sc; 282 283 /* set self dev */ 284 sc = device_get_softc(dev); 285 sc->sc_dev = dev; 286 287 /* register callback for using mbox when interrupts are enabled */ 288 sc->sc_init_hook.ich_func = ft5406ts_init; 289 sc->sc_init_hook.ich_arg = sc; 290 291 FT5406_LOCK_INIT(sc); 292 293 if (config_intrhook_establish(&sc->sc_init_hook) != 0) { 294 device_printf(dev, "config_intrhook_establish failed\n"); 295 FT5406_LOCK_DESTROY(sc); 296 return (ENOMEM); 297 } 298 299 return (0); 300 } 301 302 static int 303 ft5406ts_detach(device_t dev) 304 { 305 struct ft5406ts_softc *sc; 306 307 sc = device_get_softc(dev); 308 309 evdev_free(sc->sc_evdev); 310 311 FT5406_LOCK_DESTROY(sc); 312 313 return (0); 314 } 315 316 static device_method_t ft5406ts_methods[] = { 317 /* Device interface */ 318 DEVMETHOD(device_probe, ft5406ts_probe), 319 DEVMETHOD(device_attach, ft5406ts_attach), 320 DEVMETHOD(device_detach, ft5406ts_detach), 321 322 DEVMETHOD_END 323 }; 324 325 static driver_t ft5406ts_driver = { 326 "ft5406ts", 327 ft5406ts_methods, 328 sizeof(struct ft5406ts_softc), 329 }; 330 331 DRIVER_MODULE(ft5406ts, simplebus, ft5406ts_driver, 0, 0); 332 MODULE_DEPEND(ft5406ts, evdev, 1, 1, 1); 333