src/am7xxx.c

   1 /* am7xxx - communication with AM7xxx based USB Pico Projectors and DPFs
   2  *
   3  * Copyright (C) 2012  Antonio Ospite <ospite@studenti.unina.it>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <stdarg.h>
  23 #include <errno.h>
  24 #include <libusb.h>
  25 #include <math.h>
  26
  27 #include "am7xxx.h"
  28 #include "serialize.h"
  29
  30 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  31
  32 /* If we're not using GNU C, elide __attribute__
  33  * taken from: http://unixwiz.net/techtips/gnu-c-attributes.html)
  34  */
  35 #ifndef __GNUC__
  36 #  define  __attribute__(x)  /*NOTHING*/
  37 #endif
  38
  39 /* Control shared library symbols visibility */
  40 #if defined _WIN32 || defined __CYGWIN__
  41         #define AM7XXX_PUBLIC __declspec(dllexport)
  42         #define AM7XXX_LOCAL
  43 #else
  44         #if __GNUC__ >= 4
  45                 #define AM7XXX_PUBLIC __attribute__ ((visibility ("default")))
  46                 #define AM7XXX_LOCAL  __attribute__ ((visibility ("hidden")))
  47         #else
  48                 #define AM7XXX_PUBLIC
  49                 #define AM7XXX_LOCAL
  50         #endif
  51 #endif
  52
  53 static void log_message(am7xxx_context *ctx,
  54                         int level,
  55                         const char *function,
  56                         int line,
  57                         const char *fmt,
  58                         ...) __attribute__ ((format (printf, 5, 6)));
  59
  60 #define fatal(...)        log_message(NULL, AM7XXX_LOG_FATAL,   __func__, __LINE__, __VA_ARGS__)
  61 #define error(ctx, ...)   log_message(ctx,  AM7XXX_LOG_ERROR,   __func__, __LINE__, __VA_ARGS__)
  62 #define warning(ctx, ...) log_message(ctx,  AM7XXX_LOG_WARNING, __func__, 0,        __VA_ARGS__)
  63 #define info(ctx, ...)    log_message(ctx,  AM7XXX_LOG_INFO,    __func__, 0,        __VA_ARGS__)
  64 #define debug(ctx, ...)   log_message(ctx,  AM7XXX_LOG_DEBUG,   __func__, 0,        __VA_ARGS__)
  65 #define trace(ctx, ...)   log_message(ctx,  AM7XXX_LOG_TRACE,   NULL,     0,        __VA_ARGS__)
  66
  67 struct am7xxx_usb_device_descriptor {
  68         const char *name;
  69         uint16_t vendor_id;
  70         uint16_t product_id;
  71 };
  72
  73 static struct am7xxx_usb_device_descriptor supported_devices[] = {
  74         {
  75                 .name       = "Acer C110",
  76                 .vendor_id  = 0x1de1,
  77                 .product_id = 0xc101,
  78         },
  79         {
  80                 .name       = "Acer C112",
  81                 .vendor_id  = 0x1de1,
  82                 .product_id = 0x5501,
  83         },
  84         {
  85                 .name       ="Aiptek PocketCinema T25",
  86                 .vendor_id  = 0x08ca,
  87                 .product_id = 0x2144,
  88         },
  89         {
  90                 .name       = "Philips/Sagemcom PicoPix 1020",
  91                 .vendor_id  = 0x21e7,
  92                 .product_id = 0x000e,
  93         },
  94 };
  95
  96 /* The header size on the wire is known to be always 24 bytes, regardless of
  97  * the memory configuration enforced by different architectures or compilers
  98  * for struct am7xxx_header
  99  */
 100 #define AM7XXX_HEADER_WIRE_SIZE 24
 101
 102 struct _am7xxx_device {
 103         libusb_device_handle *usb_device;
 104         uint8_t buffer[AM7XXX_HEADER_WIRE_SIZE];
 105         am7xxx_context *ctx;
 106         am7xxx_device *next;
 107 };
 108
 109 struct _am7xxx_context {
 110         libusb_context *usb_context;
 111         int log_level;
 112         am7xxx_device *devices_list;
 113 };
 114
 115 typedef enum {
 116         AM7XXX_PACKET_TYPE_DEVINFO = 0x01,
 117         AM7XXX_PACKET_TYPE_IMAGE   = 0x02,
 118         AM7XXX_PACKET_TYPE_POWER   = 0x04,
 119         AM7XXX_PACKET_TYPE_ZOOM    = 0x05,
 120 } am7xxx_packet_type;
 121
 122 struct am7xxx_generic_header {
 123         uint32_t field0;
 124         uint32_t field1;
 125         uint32_t field2;
 126         uint32_t field3;
 127 };
 128
 129 struct am7xxx_devinfo_header {
 130         uint32_t native_width;
 131         uint32_t native_height;
 132         uint32_t unknown0;
 133         uint32_t unknown1;
 134 };
 135
 136 struct am7xxx_image_header {
 137         uint32_t format;
 138         uint32_t width;
 139         uint32_t height;
 140         uint32_t image_size;
 141 };
 142
 143 struct am7xxx_power_header {
 144         uint32_t bit2;
 145         uint32_t bit1;
 146         uint32_t bit0;
 147 };
 148
 149 struct am7xxx_zoom_header {
 150         uint32_t bit1;
 151         uint32_t bit0;
 152 };
 153
 154 /*
 155  * Examples of packet headers:
 156  *
 157  * Image header:
 158  * 02 00 00 00 00 10 3e 10 01 00 00 00 20 03 00 00 e0 01 00 00 53 E8 00 00
 159  *
 160  * Power header:
 161  * 04 00 00 00 00 0c ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 162  */
 163
 164 /* Direction of the communication from the host point of view */
 165 #define AM7XXX_DIRECTION_OUT 0 /* host -> device */
 166 #define AM7XXX_DIRECTION_IN  1 /* host <- device */
 167
 168 struct am7xxx_header {
 169         uint32_t packet_type;
 170         uint8_t direction;
 171         uint8_t header_data_len;
 172         uint8_t unknown2;
 173         uint8_t unknown3;
 174         union {
 175                 struct am7xxx_generic_header data;
 176                 struct am7xxx_devinfo_header devinfo;
 177                 struct am7xxx_image_header image;
 178                 struct am7xxx_power_header power;
 179                 struct am7xxx_zoom_header zoom;
 180         } header_data;
 181 };
 182
 183
 184 #ifdef DEBUG
 185 static void debug_dump_devinfo_header(am7xxx_context *ctx, struct am7xxx_devinfo_header *d)
 186 {
 187         if (ctx == NULL || d == NULL)
 188                 return;
 189
 190         debug(ctx, "Info header:\n");
 191         debug(ctx, "\tnative_width:  0x%08x (%u)\n", d->native_width, d->native_width);
 192         debug(ctx, "\tnative_height: 0x%08x (%u)\n", d->native_height, d->native_height);
 193         debug(ctx, "\tunknown0:      0x%08x (%u)\n", d->unknown0, d->unknown0);
 194         debug(ctx, "\tunknown1:      0x%08x (%u)\n", d->unknown1, d->unknown1);
 195 }
 196
 197 static void debug_dump_image_header(am7xxx_context *ctx, struct am7xxx_image_header *i)
 198 {
 199         if (ctx == NULL || i == NULL)
 200                 return;
 201
 202         debug(ctx, "Image header:\n");
 203         debug(ctx, "\tformat:     0x%08x (%u)\n", i->format, i->format);
 204         debug(ctx, "\twidth:      0x%08x (%u)\n", i->width, i->width);
 205         debug(ctx, "\theight:     0x%08x (%u)\n", i->height, i->height);
 206         debug(ctx, "\timage size: 0x%08x (%u)\n", i->image_size, i->image_size);
 207 }
 208
 209 static void debug_dump_power_header(am7xxx_context *ctx, struct am7xxx_power_header *p)
 210 {
 211         if (ctx == NULL || p == NULL)
 212                 return;
 213
 214         debug(ctx, "Power header:\n");
 215         debug(ctx, "\tbit2: 0x%08x (%u)\n", p->bit2, p->bit2);
 216         debug(ctx, "\tbit1: 0x%08x (%u)\n", p->bit1, p->bit1);
 217         debug(ctx, "\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
 218 }
 219
 220 static void debug_dump_zoom_header(am7xxx_context *ctx, struct am7xxx_zoom_header *z)
 221 {
 222         if (ctx == NULL || z == NULL)
 223                 return;
 224
 225         debug(ctx, "Zoom header:\n");
 226         debug(ctx, "\tbit1: 0x%08x (%u)\n", z->bit1, z->bit1);
 227         debug(ctx, "\tbit0: 0x%08x (%u)\n", z->bit0, z->bit0);
 228 }
 229
 230 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
 231 {
 232         if (ctx == NULL || h == NULL)
 233                 return;
 234
 235         debug(ctx, "BEGIN\n");
 236         debug(ctx, "packet_type:     0x%08x (%u)\n", h->packet_type, h->packet_type);
 237         debug(ctx, "direction:       0x%02hhx (%hhu)\n", h->direction, h->direction);
 238         debug(ctx, "header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len);
 239         debug(ctx, "unknown2:        0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
 240         debug(ctx, "unknown3:        0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
 241
 242         switch(h->packet_type) {
 243         case AM7XXX_PACKET_TYPE_DEVINFO:
 244                 debug_dump_devinfo_header(ctx, &(h->header_data.devinfo));
 245                 break;
 246
 247         case AM7XXX_PACKET_TYPE_IMAGE:
 248                 debug_dump_image_header(ctx, &(h->header_data.image));
 249                 break;
 250
 251         case AM7XXX_PACKET_TYPE_POWER:
 252                 debug_dump_power_header(ctx, &(h->header_data.power));
 253                 break;
 254
 255         case AM7XXX_PACKET_TYPE_ZOOM:
 256                 debug_dump_zoom_header(ctx, &(h->header_data.zoom));
 257                 break;
 258
 259         default:
 260                 debug(ctx, "Packet type not supported!\n");
 261                 break;
 262         }
 263         debug(ctx, "END\n\n");
 264 }
 265
 266 static inline unsigned int in_80chars(unsigned int i)
 267 {
 268         /* The 3 below is the length of "xx " where xx is the hex string
 269          * representation of a byte */
 270         return ((i+1) % (80/3));
 271 }
 272
 273 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
 274                               uint8_t *buffer, unsigned int len)
 275 {
 276         unsigned int i;
 277
 278         if (ctx == NULL || buffer == NULL || len == 0)
 279                 return;
 280
 281         trace(ctx, "\n");
 282         if (message)
 283                 trace(ctx, "%s\n", message);
 284
 285         for (i = 0; i < len; i++) {
 286                 trace(ctx, "%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n');
 287         }
 288         trace(ctx, "\n");
 289 }
 290 #else
 291 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
 292 {
 293         (void)ctx;
 294         (void)h;
 295 }
 296
 297 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
 298                               uint8_t *buffer, unsigned int len)
 299 {
 300         (void)ctx;
 301         (void)message;
 302         (void)buffer;
 303         (void)len;
 304 }
 305 #endif /* DEBUG */
 306
 307 static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 308 {
 309         int ret;
 310         int transferred = 0;
 311
 312         ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
 313         if (ret != 0 || (unsigned int)transferred != len) {
 314                 error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
 315                       ret, transferred, len);
 316                 return ret;
 317         }
 318
 319         trace_dump_buffer(dev->ctx, "<-- received", buffer, len);
 320
 321         return 0;
 322 }
 323
 324 static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 325 {
 326         int ret;
 327         int transferred = 0;
 328
 329         trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
 330
 331         ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0);
 332         if (ret != 0 || (unsigned int)transferred != len) {
 333                 error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
 334                       ret, transferred, len);
 335                 return ret;
 336         }
 337
 338         return 0;
 339 }
 340
 341 static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
 342 {
 343         uint8_t **buffer_iterator = &buffer;
 344
 345         put_le32(h->packet_type, buffer_iterator);
 346         put_8(h->direction, buffer_iterator);
 347         put_8(h->header_data_len, buffer_iterator);
 348         put_8(h->unknown2, buffer_iterator);
 349         put_8(h->unknown3, buffer_iterator);
 350         put_le32(h->header_data.data.field0, buffer_iterator);
 351         put_le32(h->header_data.data.field1, buffer_iterator);
 352         put_le32(h->header_data.data.field2, buffer_iterator);
 353         put_le32(h->header_data.data.field3, buffer_iterator);
 354 }
 355
 356 static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h)
 357 {
 358         uint8_t **buffer_iterator = &buffer;
 359
 360         h->packet_type = get_le32(buffer_iterator);
 361         h->direction = get_8(buffer_iterator);
 362         h->header_data_len = get_8(buffer_iterator);
 363         h->unknown2 = get_8(buffer_iterator);
 364         h->unknown3 = get_8(buffer_iterator);
 365         h->header_data.data.field0 = get_le32(buffer_iterator);
 366         h->header_data.data.field1 = get_le32(buffer_iterator);
 367         h->header_data.data.field2 = get_le32(buffer_iterator);
 368         h->header_data.data.field3 = get_le32(buffer_iterator);
 369 }
 370
 371 static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
 372 {
 373         int ret;
 374
 375         ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
 376         if (ret < 0)
 377                 goto out;
 378
 379         unserialize_header(dev->buffer, h);
 380
 381         debug_dump_header(dev->ctx, h);
 382
 383         if (h->direction == AM7XXX_DIRECTION_IN) {
 384                 ret = 0;
 385         } else {
 386                 error(dev->ctx,
 387                       "Received a packet with direction AM7XXX_DIRECTION_OUT, weird!\n");
 388                 ret = -EINVAL;
 389         }
 390
 391 out:
 392         return ret;
 393 }
 394
 395 static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
 396 {
 397         int ret;
 398
 399         debug_dump_header(dev->ctx, h);
 400
 401         serialize_header(h, dev->buffer);
 402         ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
 403         if (ret < 0)
 404                 error(dev->ctx, "failed to send data\n");
 405
 406         return ret;
 407 }
 408
 409 /* When level == AM7XXX_LOG_FATAL do not check the log_level from the context
 410  * and print the message unconditionally, this makes it possible to print
 411  * fatal messages even early on initialization, before the context has been
 412  * set up */
 413 static void log_message(am7xxx_context *ctx,
 414                         int level,
 415                         const char *function,
 416                         int line,
 417                         const char *fmt,
 418                         ...)
 419 {
 420         va_list ap;
 421
 422         if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
 423                 if (function) {
 424                         fprintf(stderr, "%s", function);
 425                         if (line)
 426                                 fprintf(stderr, "[%d]", line);
 427                         fprintf(stderr, ": ");
 428                 }
 429
 430                 va_start(ap, fmt);
 431                 vfprintf(stderr, fmt, ap);
 432                 va_end(ap);
 433         }
 434
 435         return;
 436 }
 437
 438 static am7xxx_device *add_new_device(am7xxx_context *ctx)
 439 {
 440         am7xxx_device **devices_list;
 441         am7xxx_device *new_device;
 442
 443         if (ctx == NULL) {
 444                 fatal("context must not be NULL!\n");
 445                 return NULL;
 446         }
 447
 448         devices_list = &(ctx->devices_list);
 449
 450         new_device = malloc(sizeof(*new_device));
 451         if (new_device == NULL) {
 452                 fatal("cannot allocate a new device (%s)\n", strerror(errno));
 453                 return NULL;
 454         }
 455         memset(new_device, 0, sizeof(*new_device));
 456
 457         new_device->ctx = ctx;
 458
 459         if (*devices_list == NULL) {
 460                 *devices_list = new_device;
 461         } else {
 462                 am7xxx_device *prev = *devices_list;
 463                 while (prev->next)
 464                         prev = prev->next;
 465                 prev->next = new_device;
 466         }
 467         return new_device;
 468 }
 469
 470 static am7xxx_device *find_device(am7xxx_context *ctx,
 471                                   unsigned int device_index)
 472 {
 473         unsigned int i = 0;
 474         am7xxx_device *current;
 475
 476         if (ctx == NULL) {
 477                 fatal("context must not be NULL!\n");
 478                 return NULL;
 479         }
 480
 481         current = ctx->devices_list;
 482         while (current && i++ < device_index)
 483                 current = current->next;
 484
 485         return current;
 486 }
 487
 488 typedef enum {
 489         SCAN_OP_BUILD_DEVLIST,
 490         SCAN_OP_OPEN_DEVICE,
 491 } scan_op;
 492
 493 /**
 494  * This is where the central logic of multi-device support is.
 495  *
 496  * When 'op' == SCAN_OP_BUILD_DEVLIST the parameters 'open_device_index' and
 497  * 'dev' are ignored; the function returns 0 on success and a negative value
 498  * on error.
 499  *
 500  * When 'op' == SCAN_OP_OPEN_DEVICE the function opens the supported USB
 501  * device with index 'open_device_index' and returns the correspondent
 502  * am7xxx_device in the 'dev' parameter; the function returns 0 on success,
 503  * 1 if the device was already open and a negative value on error.
 504  *
 505  * NOTES:
 506  * if scan_devices() fails when called with 'op' == SCAN_OP_BUILD_DEVLIST,
 507  * the caller might want to call am7xxx_shutdown() in order to remove
 508  * devices possibly added before the failure.
 509  */
 510 static int scan_devices(am7xxx_context *ctx, scan_op op,
 511                         unsigned int open_device_index, am7xxx_device **dev)
 512 {
 513         int num_devices;
 514         libusb_device** list;
 515         unsigned int current_index;
 516         int i;
 517         int ret;
 518
 519         if (ctx == NULL) {
 520                 fatal("context must not be NULL!\n");
 521                 return -EINVAL;
 522         }
 523         if (op == SCAN_OP_BUILD_DEVLIST && ctx->devices_list != NULL) {
 524                 error(ctx, "device scan done already? Abort!\n");
 525                 return -EINVAL;
 526         }
 527
 528         num_devices = libusb_get_device_list(ctx->usb_context, &list);
 529         if (num_devices < 0) {
 530                 ret = -ENODEV;
 531                 goto out;
 532         }
 533
 534         current_index = 0;
 535         for (i = 0; i < num_devices; i++) {
 536                 struct libusb_device_descriptor desc;
 537                 unsigned int j;
 538
 539                 ret = libusb_get_device_descriptor(list[i], &desc);
 540                 if (ret < 0)
 541                         continue;
 542
 543                 for (j = 0; j < ARRAY_SIZE(supported_devices); j++) {
 544                         if (desc.idVendor == supported_devices[j].vendor_id
 545                             && desc.idProduct == supported_devices[j].product_id) {
 546
 547                                 if (op == SCAN_OP_BUILD_DEVLIST) {
 548                                         am7xxx_device *new_device;
 549                                         info(ctx, "am7xxx device found, index: %d, name: %s\n",
 550                                              current_index,
 551                                              supported_devices[j].name);
 552                                         new_device = add_new_device(ctx);
 553                                         if (new_device == NULL) {
 554                                                 /* XXX, the caller may want
 555                                                  * to call am7xxx_shutdown() if
 556                                                  * we fail here, as we may have
 557                                                  * added some devices already
 558                                                  */
 559                                                 debug(ctx, "Cannot create a new device\n");
 560                                                 ret = -ENODEV;
 561                                                 goto out;
 562                                         }
 563                                 } else if (op == SCAN_OP_OPEN_DEVICE &&
 564                                            current_index == open_device_index) {
 565
 566                                         *dev = find_device(ctx, open_device_index);
 567                                         if (*dev == NULL) {
 568                                                 ret = -ENODEV;
 569                                                 goto out;
 570                                         }
 571
 572                                         /* the usb device has already been opened */
 573                                         if ((*dev)->usb_device) {
 574                                                 debug(ctx, "(*dev)->usb_device already set\n");
 575                                                 ret = 1;
 576                                                 goto out;
 577                                         }
 578
 579                                         ret = libusb_open(list[i], &((*dev)->usb_device));
 580                                         if (ret < 0) {
 581                                                 debug(ctx, "libusb_open failed\n");
 582                                                 goto out;
 583                                         }
 584
 585                                         libusb_set_configuration((*dev)->usb_device, 2);
 586                                         libusb_claim_interface((*dev)->usb_device, 0);
 587                                         goto out;
 588                                 }
 589                                 current_index++;
 590                         }
 591                 }
 592         }
 593
 594         /* if we made it up to here we didn't find any device to open */
 595         if (op == SCAN_OP_OPEN_DEVICE) {
 596                 error(ctx, "Cannot find any device to open\n");
 597                 ret = -ENODEV;
 598                 goto out;
 599         }
 600
 601         /* everything went fine when building the device list */
 602         ret = 0;
 603 out:
 604         libusb_free_device_list(list, 1);
 605         return ret;
 606 }
 607
 608 /* Public API */
 609
 610 AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
 611 {
 612         int ret = 0;
 613
 614         *ctx = malloc(sizeof(**ctx));
 615         if (*ctx == NULL) {
 616                 fatal("cannot allocate the context (%s)\n", strerror(errno));
 617                 ret = -ENOMEM;
 618                 goto out;
 619         }
 620         memset(*ctx, 0, sizeof(**ctx));
 621
 622         /* Set the highest log level during initialization */
 623         (*ctx)->log_level = AM7XXX_LOG_TRACE;
 624
 625         ret = libusb_init(&((*ctx)->usb_context));
 626         if (ret < 0)
 627                 goto out_free_context;
 628
 629         libusb_set_debug((*ctx)->usb_context, 3);
 630
 631         ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL);
 632         if (ret < 0) {
 633                 error(*ctx, "scan_devices() failed\n");
 634                 am7xxx_shutdown(*ctx);
 635                 goto out;
 636         }
 637
 638         /* Set a quieter log level as default for normal operation */
 639         (*ctx)->log_level = AM7XXX_LOG_ERROR;
 640         return 0;
 641
 642 out_free_context:
 643         free(*ctx);
 644         *ctx = NULL;
 645 out:
 646         return ret;
 647 }
 648
 649 AM7XXX_PUBLIC void am7xxx_shutdown(am7xxx_context *ctx)
 650 {
 651         am7xxx_device *current;
 652
 653         if (ctx == NULL) {
 654                 fatal("context must not be NULL!\n");
 655                 return;
 656         }
 657
 658         current = ctx->devices_list;
 659         while (current) {
 660                 am7xxx_device *next = current->next;
 661                 am7xxx_close_device(current);
 662                 free(current);
 663                 current = next;
 664         }
 665
 666         libusb_exit(ctx->usb_context);
 667         free(ctx);
 668         ctx = NULL;
 669 }
 670
 671 AM7XXX_PUBLIC void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
 672 {
 673         ctx->log_level = log_level;
 674 }
 675
 676 AM7XXX_PUBLIC int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
 677                        unsigned int device_index)
 678 {
 679         int ret;
 680
 681         if (ctx == NULL) {
 682                 fatal("context must not be NULL!\n");
 683                 return -EINVAL;
 684         }
 685
 686         ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev);
 687         if (ret < 0) {
 688                 errno = ENODEV;
 689         } else if (ret > 0) {
 690                 warning(ctx, "device %d already open\n", device_index);
 691                 errno = EBUSY;
 692                 ret = -EBUSY;
 693         }
 694
 695         return ret;
 696 }
 697
 698 AM7XXX_PUBLIC int am7xxx_close_device(am7xxx_device *dev)
 699 {
 700         if (dev == NULL) {
 701                 fatal("dev must not be NULL!\n");
 702                 return -EINVAL;
 703         }
 704         if (dev->usb_device) {
 705                 libusb_release_interface(dev->usb_device, 0);
 706                 libusb_close(dev->usb_device);
 707                 dev->usb_device = NULL;
 708         }
 709         return 0;
 710 }
 711
 712 AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
 713                            am7xxx_device_info *device_info)
 714 {
 715         int ret;
 716         struct am7xxx_header h = {
 717                 .packet_type     = AM7XXX_PACKET_TYPE_DEVINFO,
 718                 .direction       = AM7XXX_DIRECTION_OUT,
 719                 .header_data_len = 0x00,
 720                 .unknown2        = 0x3e,
 721                 .unknown3        = 0x10,
 722                 .header_data = {
 723                         .devinfo = {
 724                                 .native_width  = 0,
 725                                 .native_height = 0,
 726                                 .unknown0      = 0,
 727                                 .unknown1      = 0,
 728                         },
 729                 },
 730         };
 731
 732         ret = send_header(dev, &h);
 733         if (ret < 0)
 734                 return ret;
 735
 736         ret = read_header(dev, &h);
 737         if (ret < 0)
 738                 return ret;
 739
 740         device_info->native_width = h.header_data.devinfo.native_width;
 741         device_info->native_height = h.header_data.devinfo.native_height;
 742 #if 0
 743         /* No reason to expose these in the public API until we know what they mean */
 744         device_info->unknown0 = h.header_data.devinfo.unknown0;
 745         device_info->unknown1 = h.header_data.devinfo.unknown1;
 746 #endif
 747
 748         return 0;
 749 }
 750
 751 AM7XXX_PUBLIC int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev,
 752                                         unsigned int upscale,
 753                                         unsigned int original_width,
 754                                         unsigned int original_height,
 755                                         unsigned int *scaled_width,
 756                                         unsigned int *scaled_height)
 757 {
 758
 759         am7xxx_device_info device_info;
 760         float width_ratio;
 761         float height_ratio;
 762         int ret;
 763
 764         ret = am7xxx_get_device_info(dev, &device_info);
 765         if (ret < 0) {
 766                 error(dev->ctx, "cannot get device info\n");
 767                 return ret;
 768         }
 769
 770         /*
 771          * Check if we need to rescale; if the input image fits the native
 772          * dimensions there is no need to, unless we want to upscale.
 773          */
 774         if (!upscale &&
 775             original_width <= device_info.native_width &&
 776             original_height <= device_info.native_height ) {
 777                 debug(dev->ctx, "CASE 0, no rescaling, the original image fits already\n");
 778                 *scaled_width = original_width;
 779                 *scaled_height = original_height;
 780                 return 0;
 781         }
 782
 783         /* Input dimensions relative to the device native dimensions */
 784         width_ratio =  (float)original_width / device_info.native_width;
 785         height_ratio = (float)original_height / device_info.native_height;
 786
 787         if (width_ratio > height_ratio) {
 788                 /*
 789                  * The input is proportionally "wider" than the device viewport
 790                  * so its height needs to be adjusted
 791                  */
 792                 debug(dev->ctx, "CASE 1, original image wider, adjust the scaled height\n");
 793                 *scaled_width = device_info.native_width;
 794                 *scaled_height = (unsigned int)lroundf(original_height / width_ratio);
 795         } else if (width_ratio < height_ratio) {
 796                 /*
 797                  * The input is proportionally "taller" than the device viewport
 798                  * so its width needs to be adjusted
 799                  */
 800                 debug(dev->ctx, "CASE 2 original image taller, adjust the scaled width\n");
 801                 *scaled_width = (unsigned int)lroundf(original_width / height_ratio);
 802                 *scaled_height = device_info.native_height;
 803         } else {
 804                 debug(dev->ctx, "CASE 3, just rescale, same aspect ratio already\n");
 805                 *scaled_width = device_info.native_width;
 806                 *scaled_height = device_info.native_height;
 807         }
 808         debug(dev->ctx, "scaled dimensions: %dx%d\n", *scaled_width, *scaled_height);
 809
 810         return 0;
 811 }
 812
 813 AM7XXX_PUBLIC int am7xxx_send_image(am7xxx_device *dev,
 814                       am7xxx_image_format format,
 815                       unsigned int width,
 816                       unsigned int height,
 817                       uint8_t *image,
 818                       unsigned int image_size)
 819 {
 820         int ret;
 821         struct am7xxx_header h = {
 822                 .packet_type     = AM7XXX_PACKET_TYPE_IMAGE,
 823                 .direction       = AM7XXX_DIRECTION_OUT,
 824                 .header_data_len = sizeof(struct am7xxx_image_header),
 825                 .unknown2        = 0x3e,
 826                 .unknown3        = 0x10,
 827                 .header_data = {
 828                         .image = {
 829                                 .format     = format,
 830                                 .width      = width,
 831                                 .height     = height,
 832                                 .image_size = image_size,
 833                         },
 834                 },
 835         };
 836
 837         ret = send_header(dev, &h);
 838         if (ret < 0)
 839                 return ret;
 840
 841         if (image == NULL || image_size == 0) {
 842                 warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
 843                 return 0;
 844         }
 845
 846         return send_data(dev, image, image_size);
 847 }
 848
 849 AM7XXX_PUBLIC int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
 850 {
 851         int ret;
 852         struct am7xxx_header h = {
 853                 .packet_type     = AM7XXX_PACKET_TYPE_POWER,
 854                 .direction       = AM7XXX_DIRECTION_OUT,
 855                 .header_data_len = sizeof(struct am7xxx_power_header),
 856                 .unknown2        = 0x3e,
 857                 .unknown3        = 0x10,
 858         };
 859
 860         switch(power) {
 861         case AM7XXX_POWER_OFF:
 862                 h.header_data.power.bit2 = 0;
 863                 h.header_data.power.bit1 = 0;
 864                 h.header_data.power.bit0 = 0;
 865                 break;
 866
 867         case AM7XXX_POWER_LOW:
 868                 h.header_data.power.bit2 = 0;
 869                 h.header_data.power.bit1 = 0;
 870                 h.header_data.power.bit0 = 1;
 871                 break;
 872
 873         case AM7XXX_POWER_MIDDLE:
 874                 h.header_data.power.bit2 = 0;
 875                 h.header_data.power.bit1 = 1;
 876                 h.header_data.power.bit0 = 0;
 877                 break;
 878
 879         case AM7XXX_POWER_HIGH:
 880                 h.header_data.power.bit2 = 0;
 881                 h.header_data.power.bit1 = 1;
 882                 h.header_data.power.bit0 = 1;
 883                 break;
 884
 885         case AM7XXX_POWER_TURBO:
 886                 h.header_data.power.bit2 = 1;
 887                 h.header_data.power.bit1 = 0;
 888                 h.header_data.power.bit0 = 0;
 889                 break;
 890
 891         default:
 892                 error(dev->ctx, "Unsupported power mode.\n");
 893                 return -EINVAL;
 894         };
 895
 896         ret = send_header(dev, &h);
 897         if (ret < 0)
 898                 return ret;
 899
 900         return 0;
 901 }
 902
 903 AM7XXX_PUBLIC int am7xxx_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
 904 {
 905         int ret;
 906         struct am7xxx_header h = {
 907                 .packet_type     = AM7XXX_PACKET_TYPE_ZOOM,
 908                 .direction       = AM7XXX_DIRECTION_OUT,
 909                 .header_data_len = sizeof(struct am7xxx_zoom_header),
 910                 .unknown2        = 0x3e,
 911                 .unknown3        = 0x10,
 912         };
 913
 914         switch(zoom) {
 915         case AM7XXX_ZOOM_ORIGINAL:
 916                 h.header_data.zoom.bit1 = 0;
 917                 h.header_data.zoom.bit0 = 0;
 918                 break;
 919
 920         case AM7XXX_ZOOM_H:
 921                 h.header_data.zoom.bit1 = 0;
 922                 h.header_data.zoom.bit0 = 1;
 923                 break;
 924
 925         case AM7XXX_ZOOM_H_V:
 926                 h.header_data.zoom.bit1 = 1;
 927                 h.header_data.zoom.bit0 = 0;
 928                 break;
 929
 930         case AM7XXX_ZOOM_TEST:
 931                 h.header_data.zoom.bit1 = 1;
 932                 h.header_data.zoom.bit0 = 1;
 933                 break;
 934
 935         default:
 936                 error(dev->ctx, "Unsupported zoom mode.\n");
 937                 return -EINVAL;
 938         };
 939
 940         ret = send_header(dev, &h);
 941         if (ret < 0)
 942                 return ret;
 943
 944         return 0;
 945 }