src/am7xxx.c

   1 /* am7xxx - communication with AM7xxx based USB Pico Projectors and DPFs
   2  *
   3  * Copyright (C) 2012-2014  Antonio Ospite <ao2@ao2.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 #include "tools.h"
  30
  31 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  32
  33 /* If we're not using GNU C, elide __attribute__
  34  * taken from: http://unixwiz.net/techtips/gnu-c-attributes.html)
  35  */
  36 #ifndef __GNUC__
  37 #  define  __attribute__(x)  /* NOTHING */
  38 #endif
  39
  40 /* Control shared library symbols visibility */
  41 #if defined _WIN32 || defined __CYGWIN__
  42         #define AM7XXX_PUBLIC __declspec(dllexport)
  43         #define AM7XXX_LOCAL
  44 #else
  45         #if __GNUC__ >= 4
  46                 #define AM7XXX_PUBLIC __attribute__ ((visibility ("default")))
  47                 #define AM7XXX_LOCAL  __attribute__ ((visibility ("hidden")))
  48         #else
  49                 #define AM7XXX_PUBLIC
  50                 #define AM7XXX_LOCAL
  51         #endif
  52 #endif
  53
  54 static void log_message(am7xxx_context *ctx,
  55                         int level,
  56                         const char *function,
  57                         int line,
  58                         const char *fmt,
  59                         ...) __attribute__ ((format (printf, 5, 6)));
  60
  61 #define fatal(...)        log_message(NULL, AM7XXX_LOG_FATAL,   __func__, __LINE__, __VA_ARGS__)
  62 #define error(ctx, ...)   log_message(ctx,  AM7XXX_LOG_ERROR,   __func__, __LINE__, __VA_ARGS__)
  63 #define warning(ctx, ...) log_message(ctx,  AM7XXX_LOG_WARNING, __func__, 0,        __VA_ARGS__)
  64 #define info(ctx, ...)    log_message(ctx,  AM7XXX_LOG_INFO,    __func__, 0,        __VA_ARGS__)
  65 #define debug(ctx, ...)   log_message(ctx,  AM7XXX_LOG_DEBUG,   __func__, 0,        __VA_ARGS__)
  66 #define trace(ctx, ...)   log_message(ctx,  AM7XXX_LOG_TRACE,   NULL,     0,        __VA_ARGS__)
  67
  68 struct am7xxx_ops {
  69         int (*set_power_mode)(am7xxx_device *dev, am7xxx_power_mode power);
  70         int (*set_zoom_mode)(am7xxx_device *dev, am7xxx_zoom_mode zoom);
  71 };
  72
  73 struct am7xxx_usb_device_descriptor {
  74         const char *name;
  75         uint16_t vendor_id;
  76         uint16_t product_id;
  77         uint8_t configuration;    /* The bConfigurationValue of the device */
  78         uint8_t interface_number; /* The bInterfaceNumber of the device */
  79         struct am7xxx_ops ops;
  80 };
  81
  82 static int default_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power);
  83 static int picopix_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power);
  84 static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom);
  85 static int picopix_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom);
  86
  87 #define DEFAULT_OPS { \
  88         .set_power_mode = default_set_power_mode, \
  89         .set_zoom_mode = default_set_zoom_mode, \
  90 }
  91
  92 static const struct am7xxx_usb_device_descriptor supported_devices[] = {
  93         {
  94                 .name       = "Acer C110",
  95                 .vendor_id  = 0x1de1,
  96                 .product_id = 0xc101,
  97                 .configuration    = 2,
  98                 .interface_number = 0,
  99                 .ops = DEFAULT_OPS,
 100         },
 101         {
 102                 .name       = "Acer C112",
 103                 .vendor_id  = 0x1de1,
 104                 .product_id = 0x5501,
 105                 .configuration    = 2,
 106                 .interface_number = 0,
 107                 .ops = DEFAULT_OPS,
 108         },
 109         {
 110                 .name       ="Aiptek PocketCinema T25",
 111                 .vendor_id  = 0x08ca,
 112                 .product_id = 0x2144,
 113                 .configuration    = 2,
 114                 .interface_number = 0,
 115                 .ops = DEFAULT_OPS,
 116         },
 117         {
 118                 .name       = "Philips/Sagemcom PicoPix 1020",
 119                 .vendor_id  = 0x21e7,
 120                 .product_id = 0x000e,
 121                 .configuration    = 2,
 122                 .interface_number = 0,
 123                 .ops = DEFAULT_OPS,
 124         },
 125         {
 126                 .name       = "Philips/Sagemcom PicoPix 2055",
 127                 .vendor_id  = 0x21e7,
 128                 .product_id = 0x0016,
 129                 .configuration    = 2,
 130                 .interface_number = 0,
 131                 .ops = {
 132                         .set_power_mode = picopix_set_power_mode,
 133                         .set_zoom_mode = picopix_set_zoom_mode,
 134                 },
 135         },
 136         {
 137                 .name       = "Philips/Sagemcom PicoPix 2330",
 138                 .vendor_id  = 0x21e7,
 139                 .product_id = 0x0019,
 140                 .configuration    = 1,
 141                 .interface_number = 0,
 142         },
 143 };
 144
 145 /* The header size on the wire is known to be always 24 bytes, regardless of
 146  * the memory configuration enforced by different architectures or compilers
 147  * for struct am7xxx_header
 148  */
 149 #define AM7XXX_HEADER_WIRE_SIZE 24
 150
 151 struct _am7xxx_device {
 152         libusb_device_handle *usb_device;
 153         struct libusb_transfer *transfer;
 154         int transfer_completed;
 155         uint8_t buffer[AM7XXX_HEADER_WIRE_SIZE];
 156         am7xxx_device_info *device_info;
 157         am7xxx_context *ctx;
 158         const struct am7xxx_usb_device_descriptor *desc;
 159         am7xxx_device *next;
 160 };
 161
 162 struct _am7xxx_context {
 163         libusb_context *usb_context;
 164         int log_level;
 165         am7xxx_device *devices_list;
 166 };
 167
 168 typedef enum {
 169         AM7XXX_PACKET_TYPE_DEVINFO = 0x01,
 170         AM7XXX_PACKET_TYPE_IMAGE   = 0x02,
 171         AM7XXX_PACKET_TYPE_POWER   = 0x04,
 172         AM7XXX_PACKET_TYPE_ZOOM    = 0x05,
 173         AM7XXX_PACKET_TYPE_PICOPIX_POWER_LOW    = 0x15,
 174         AM7XXX_PACKET_TYPE_PICOPIX_POWER_MEDIUM = 0x16,
 175         AM7XXX_PACKET_TYPE_PICOPIX_POWER_HIGH   = 0x17,
 176         AM7XXX_PACKET_TYPE_PICOPIX_ENABLE_TI    = 0x18,
 177         AM7XXX_PACKET_TYPE_PICOPIX_DISABLE_TI   = 0x19,
 178 } am7xxx_packet_type;
 179
 180 struct am7xxx_generic_header {
 181         uint32_t field0;
 182         uint32_t field1;
 183         uint32_t field2;
 184         uint32_t field3;
 185 };
 186
 187 struct am7xxx_devinfo_header {
 188         uint32_t native_width;
 189         uint32_t native_height;
 190         uint32_t unknown0;
 191         uint32_t unknown1;
 192 };
 193
 194 struct am7xxx_image_header {
 195         uint32_t format;
 196         uint32_t width;
 197         uint32_t height;
 198         uint32_t image_size;
 199 };
 200
 201 struct am7xxx_power_header {
 202         uint32_t bit2;
 203         uint32_t bit1;
 204         uint32_t bit0;
 205 };
 206
 207 struct am7xxx_zoom_header {
 208         uint32_t bit1;
 209         uint32_t bit0;
 210 };
 211
 212 /*
 213  * Examples of packet headers:
 214  *
 215  * Image header:
 216  * 02 00 00 00 00 10 3e 10 01 00 00 00 20 03 00 00 e0 01 00 00 53 E8 00 00
 217  *
 218  * Power header:
 219  * 04 00 00 00 00 0c ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 220  */
 221
 222 /* Direction of the communication from the host point of view */
 223 #define AM7XXX_DIRECTION_OUT 0 /* host -> device */
 224 #define AM7XXX_DIRECTION_IN  1 /* host <- device */
 225
 226 struct am7xxx_header {
 227         uint32_t packet_type;
 228         uint8_t direction;
 229         uint8_t header_data_len;
 230         uint8_t unknown2;
 231         uint8_t unknown3;
 232         union {
 233                 struct am7xxx_generic_header data;
 234                 struct am7xxx_devinfo_header devinfo;
 235                 struct am7xxx_image_header image;
 236                 struct am7xxx_power_header power;
 237                 struct am7xxx_zoom_header zoom;
 238         } header_data;
 239 };
 240
 241
 242 #ifdef DEBUG
 243 static void debug_dump_generic_header(am7xxx_context *ctx, struct am7xxx_generic_header *g)
 244 {
 245         if (ctx == NULL || g == NULL)
 246                 return;
 247
 248         debug(ctx, "Generic header:\n");
 249         debug(ctx, "\tfield0:  0x%08x (%u)\n", g->field0, g->field0);
 250         debug(ctx, "\tfield1:  0x%08x (%u)\n", g->field1, g->field1);
 251         debug(ctx, "\tfield2:  0x%08x (%u)\n", g->field2, g->field2);
 252         debug(ctx, "\tfield3:  0x%08x (%u)\n", g->field3, g->field3);
 253 }
 254
 255 static void debug_dump_devinfo_header(am7xxx_context *ctx, struct am7xxx_devinfo_header *d)
 256 {
 257         if (ctx == NULL || d == NULL)
 258                 return;
 259
 260         debug(ctx, "Info header:\n");
 261         debug(ctx, "\tnative_width:  0x%08x (%u)\n", d->native_width, d->native_width);
 262         debug(ctx, "\tnative_height: 0x%08x (%u)\n", d->native_height, d->native_height);
 263         debug(ctx, "\tunknown0:      0x%08x (%u)\n", d->unknown0, d->unknown0);
 264         debug(ctx, "\tunknown1:      0x%08x (%u)\n", d->unknown1, d->unknown1);
 265 }
 266
 267 static void debug_dump_image_header(am7xxx_context *ctx, struct am7xxx_image_header *i)
 268 {
 269         if (ctx == NULL || i == NULL)
 270                 return;
 271
 272         debug(ctx, "Image header:\n");
 273         debug(ctx, "\tformat:     0x%08x (%u)\n", i->format, i->format);
 274         debug(ctx, "\twidth:      0x%08x (%u)\n", i->width, i->width);
 275         debug(ctx, "\theight:     0x%08x (%u)\n", i->height, i->height);
 276         debug(ctx, "\timage size: 0x%08x (%u)\n", i->image_size, i->image_size);
 277 }
 278
 279 static void debug_dump_power_header(am7xxx_context *ctx, struct am7xxx_power_header *p)
 280 {
 281         if (ctx == NULL || p == NULL)
 282                 return;
 283
 284         debug(ctx, "Power header:\n");
 285         debug(ctx, "\tbit2: 0x%08x (%u)\n", p->bit2, p->bit2);
 286         debug(ctx, "\tbit1: 0x%08x (%u)\n", p->bit1, p->bit1);
 287         debug(ctx, "\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
 288 }
 289
 290 static void debug_dump_zoom_header(am7xxx_context *ctx, struct am7xxx_zoom_header *z)
 291 {
 292         if (ctx == NULL || z == NULL)
 293                 return;
 294
 295         debug(ctx, "Zoom header:\n");
 296         debug(ctx, "\tbit1: 0x%08x (%u)\n", z->bit1, z->bit1);
 297         debug(ctx, "\tbit0: 0x%08x (%u)\n", z->bit0, z->bit0);
 298 }
 299
 300 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
 301 {
 302         if (ctx == NULL || h == NULL)
 303                 return;
 304
 305         debug(ctx, "BEGIN\n");
 306         debug(ctx, "packet_type:     0x%08x (%u)\n", h->packet_type, h->packet_type);
 307         debug(ctx, "direction:       0x%02hhx (%hhu) (%s)\n", h->direction, h->direction,
 308               h->direction == AM7XXX_DIRECTION_IN ? "IN" :
 309               h->direction == AM7XXX_DIRECTION_OUT ? "OUT" :
 310               "UNKNOWN");
 311         debug(ctx, "header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len);
 312         debug(ctx, "unknown2:        0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
 313         debug(ctx, "unknown3:        0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
 314
 315         switch(h->packet_type) {
 316         case AM7XXX_PACKET_TYPE_DEVINFO:
 317                 debug_dump_devinfo_header(ctx, &(h->header_data.devinfo));
 318                 break;
 319
 320         case AM7XXX_PACKET_TYPE_IMAGE:
 321                 debug_dump_image_header(ctx, &(h->header_data.image));
 322                 break;
 323
 324         case AM7XXX_PACKET_TYPE_POWER:
 325                 debug_dump_power_header(ctx, &(h->header_data.power));
 326                 break;
 327
 328         case AM7XXX_PACKET_TYPE_ZOOM:
 329                 debug_dump_zoom_header(ctx, &(h->header_data.zoom));
 330                 break;
 331
 332         default:
 333                 debug(ctx, "Parsing data not supported for this packet type!\n");
 334                 debug_dump_generic_header(ctx, &(h->header_data.data));
 335                 break;
 336         }
 337         debug(ctx, "END\n\n");
 338 }
 339
 340 static inline unsigned int in_80chars(unsigned int i)
 341 {
 342         /* The 3 below is the length of "xx " where xx is the hex string
 343          * representation of a byte */
 344         return ((i+1) % (80/3));
 345 }
 346
 347 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
 348                               uint8_t *buffer, unsigned int len)
 349 {
 350         unsigned int i;
 351
 352         if (ctx == NULL || buffer == NULL || len == 0)
 353                 return;
 354
 355         trace(ctx, "\n");
 356         if (message)
 357                 trace(ctx, "%s\n", message);
 358
 359         for (i = 0; i < len; i++) {
 360                 trace(ctx, "%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n');
 361         }
 362         trace(ctx, "\n");
 363 }
 364 #else
 365 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
 366 {
 367         (void)ctx;
 368         (void)h;
 369 }
 370
 371 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
 372                               uint8_t *buffer, unsigned int len)
 373 {
 374         (void)ctx;
 375         (void)message;
 376         (void)buffer;
 377         (void)len;
 378 }
 379 #endif /* DEBUG */
 380
 381 static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 382 {
 383         int ret;
 384         int transferred = 0;
 385
 386         ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
 387         if (ret != 0 || (unsigned int)transferred != len) {
 388                 error(dev->ctx, "%s. Transferred: %d (expected %u)\n",
 389                       libusb_error_name(ret), transferred, len);
 390                 return ret;
 391         }
 392
 393         trace_dump_buffer(dev->ctx, "<-- received", buffer, len);
 394
 395         return 0;
 396 }
 397
 398 static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 399 {
 400         int ret;
 401         int transferred = 0;
 402
 403         trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
 404
 405         ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0);
 406         if (ret != 0 || (unsigned int)transferred != len) {
 407                 error(dev->ctx, "%s. Transferred: %d (expected %u)\n",
 408                       libusb_error_name(ret), transferred, len);
 409                 return ret;
 410         }
 411
 412         return 0;
 413 }
 414
 415 static void send_data_async_complete_cb(struct libusb_transfer *transfer)
 416 {
 417         am7xxx_device *dev = (am7xxx_device *)(transfer->user_data);
 418         int *completed = &(dev->transfer_completed);
 419         int transferred = transfer->actual_length;
 420         int ret;
 421
 422         if (transferred != transfer->length) {
 423                 error(dev->ctx, "transferred: %d (expected %u)\n",
 424                       transferred, transfer->length);
 425         }
 426
 427         switch (transfer->status) {
 428         case LIBUSB_TRANSFER_COMPLETED:
 429                 ret = 0;
 430                 break;
 431         case LIBUSB_TRANSFER_TIMED_OUT:
 432                 ret = LIBUSB_ERROR_TIMEOUT;
 433                 break;
 434         case LIBUSB_TRANSFER_STALL:
 435                 ret = LIBUSB_ERROR_PIPE;
 436                 break;
 437         case LIBUSB_TRANSFER_OVERFLOW:
 438                 ret = LIBUSB_ERROR_OVERFLOW;
 439                 break;
 440         case LIBUSB_TRANSFER_NO_DEVICE:
 441                 ret = LIBUSB_ERROR_NO_DEVICE;
 442                 break;
 443         case LIBUSB_TRANSFER_ERROR:
 444         case LIBUSB_TRANSFER_CANCELLED:
 445                 ret = LIBUSB_ERROR_IO;
 446                 break;
 447         default:
 448                 error(dev->ctx, "unrecognised status code %d", transfer->status);
 449                 ret = LIBUSB_ERROR_OTHER;
 450         }
 451
 452         if (ret < 0)
 453                 error(dev->ctx, "libusb transfer failed: %s",
 454                       libusb_error_name(ret));
 455
 456         libusb_free_transfer(transfer);
 457         transfer = NULL;
 458
 459         *completed = 1;
 460 }
 461
 462 static inline void wait_for_trasfer_completed(am7xxx_device *dev)
 463 {
 464         while (!dev->transfer_completed) {
 465                 int ret = libusb_handle_events_completed(dev->ctx->usb_context,
 466                                                          &(dev->transfer_completed));
 467                 if (ret < 0) {
 468                         if (ret == LIBUSB_ERROR_INTERRUPTED)
 469                                 continue;
 470                         error(dev->ctx, "libusb_handle_events failed: %s, cancelling transfer and retrying",
 471                               libusb_error_name(ret));
 472                         libusb_cancel_transfer(dev->transfer);
 473                         continue;
 474                 }
 475         }
 476 }
 477
 478 static int send_data_async(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 479 {
 480         int ret;
 481         uint8_t *transfer_buffer;
 482
 483         dev->transfer = libusb_alloc_transfer(0);
 484         if (dev->transfer == NULL) {
 485                 error(dev->ctx, "cannot allocate transfer (%s)\n",
 486                       strerror(errno));
 487                 return -ENOMEM;
 488         }
 489
 490         /* Make a copy of the buffer so the caller can safely reuse it just
 491          * after libusb_submit_transfer() has returned. This technique
 492          * requires more dynamic allocations compared to a proper
 493          * double-buffering approach but it takes a lot less code. */
 494         transfer_buffer = malloc(len);
 495         if (transfer_buffer == NULL) {
 496                 error(dev->ctx, "cannot allocate transfer buffer (%s)\n",
 497                       strerror(errno));
 498                 ret = -ENOMEM;
 499                 goto err;
 500         }
 501         memcpy(transfer_buffer, buffer, len);
 502
 503         dev->transfer->flags |= LIBUSB_TRANSFER_FREE_BUFFER;
 504         libusb_fill_bulk_transfer(dev->transfer, dev->usb_device, 0x1,
 505                                   transfer_buffer, len,
 506                                   send_data_async_complete_cb, dev, 0);
 507
 508         /* wait for the previous transfer to complete */
 509         wait_for_trasfer_completed(dev);
 510
 511         trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
 512
 513         dev->transfer_completed = 0;
 514         ret = libusb_submit_transfer(dev->transfer);
 515         if (ret < 0)
 516                 goto err;
 517
 518         return 0;
 519
 520 err:
 521         libusb_free_transfer(dev->transfer);
 522         dev->transfer = NULL;
 523         return ret;
 524 }
 525
 526 static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
 527 {
 528         uint8_t **buffer_iterator = &buffer;
 529
 530         put_le32(h->packet_type, buffer_iterator);
 531         put_8(h->direction, buffer_iterator);
 532         put_8(h->header_data_len, buffer_iterator);
 533         put_8(h->unknown2, buffer_iterator);
 534         put_8(h->unknown3, buffer_iterator);
 535         put_le32(h->header_data.data.field0, buffer_iterator);
 536         put_le32(h->header_data.data.field1, buffer_iterator);
 537         put_le32(h->header_data.data.field2, buffer_iterator);
 538         put_le32(h->header_data.data.field3, buffer_iterator);
 539 }
 540
 541 static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h)
 542 {
 543         uint8_t **buffer_iterator = &buffer;
 544
 545         h->packet_type = get_le32(buffer_iterator);
 546         h->direction = get_8(buffer_iterator);
 547         h->header_data_len = get_8(buffer_iterator);
 548         h->unknown2 = get_8(buffer_iterator);
 549         h->unknown3 = get_8(buffer_iterator);
 550         h->header_data.data.field0 = get_le32(buffer_iterator);
 551         h->header_data.data.field1 = get_le32(buffer_iterator);
 552         h->header_data.data.field2 = get_le32(buffer_iterator);
 553         h->header_data.data.field3 = get_le32(buffer_iterator);
 554 }
 555
 556 static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
 557 {
 558         int ret;
 559
 560         ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
 561         if (ret < 0)
 562                 goto out;
 563
 564         unserialize_header(dev->buffer, h);
 565
 566         if (h->direction == AM7XXX_DIRECTION_IN) {
 567                 ret = 0;
 568         } else {
 569                 error(dev->ctx,
 570                       "Expected an AM7XXX_DIRECTION_IN packet, got one with direction = %d. Weird!\n",
 571                       h->direction);
 572                 ret = -EINVAL;
 573         }
 574
 575         debug_dump_header(dev->ctx, h);
 576
 577 out:
 578         return ret;
 579 }
 580
 581 static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
 582 {
 583         int ret;
 584
 585         debug_dump_header(dev->ctx, h);
 586
 587         /* For symmetry with read_header() we should check here for
 588          * h->direction == AM7XXX_DIRECTION_OUT but we just ensure that in all
 589          * the callers and save some cycles here.
 590          */
 591
 592         serialize_header(h, dev->buffer);
 593
 594         ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
 595         if (ret < 0)
 596                 error(dev->ctx, "failed to send data\n");
 597
 598         return ret;
 599 }
 600
 601 static int send_command(am7xxx_device *dev, am7xxx_packet_type type)
 602 {
 603         struct am7xxx_header h = {
 604                 .packet_type     = type,
 605                 .direction       = AM7XXX_DIRECTION_OUT,
 606                 .header_data_len = 0x00,
 607                 .unknown2        = 0x3e,
 608                 .unknown3        = 0x10,
 609                 .header_data = {
 610                         .data = {
 611                                 .field0 = 0,
 612                                 .field1 = 0,
 613                                 .field2 = 0,
 614                                 .field3 = 0,
 615                         },
 616                 },
 617         };
 618
 619         return send_header(dev, &h);
 620 }
 621
 622
 623 /* When level == AM7XXX_LOG_FATAL do not check the log_level from the context
 624  * and print the message unconditionally, this makes it possible to print
 625  * fatal messages even early on initialization, before the context has been
 626  * set up */
 627 static void log_message(am7xxx_context *ctx,
 628                         int level,
 629                         const char *function,
 630                         int line,
 631                         const char *fmt,
 632                         ...)
 633 {
 634         va_list ap;
 635
 636         if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
 637                 if (function) {
 638                         fprintf(stderr, "%s", function);
 639                         if (line)
 640                                 fprintf(stderr, "[%d]", line);
 641                         fprintf(stderr, ": ");
 642                 }
 643
 644                 va_start(ap, fmt);
 645                 vfprintf(stderr, fmt, ap);
 646                 va_end(ap);
 647         }
 648
 649         return;
 650 }
 651
 652 static am7xxx_device *add_new_device(am7xxx_context *ctx,
 653                                      const struct am7xxx_usb_device_descriptor *desc)
 654 {
 655         am7xxx_device **devices_list;
 656         am7xxx_device *new_device;
 657
 658         if (ctx == NULL) {
 659                 fatal("context must not be NULL!\n");
 660                 return NULL;
 661         }
 662
 663         new_device = malloc(sizeof(*new_device));
 664         if (new_device == NULL) {
 665                 fatal("cannot allocate a new device (%s)\n", strerror(errno));
 666                 return NULL;
 667         }
 668         memset(new_device, 0, sizeof(*new_device));
 669
 670         new_device->ctx = ctx;
 671         new_device->desc = desc;
 672         new_device->transfer_completed = 1;
 673
 674         devices_list = &(ctx->devices_list);
 675
 676         if (*devices_list == NULL) {
 677                 *devices_list = new_device;
 678         } else {
 679                 am7xxx_device *prev = *devices_list;
 680                 while (prev->next)
 681                         prev = prev->next;
 682                 prev->next = new_device;
 683         }
 684         return new_device;
 685 }
 686
 687 static am7xxx_device *find_device(am7xxx_context *ctx,
 688                                   unsigned int device_index)
 689 {
 690         unsigned int i = 0;
 691         am7xxx_device *current;
 692
 693         if (ctx == NULL) {
 694                 fatal("context must not be NULL!\n");
 695                 return NULL;
 696         }
 697
 698         current = ctx->devices_list;
 699         while (current && i++ < device_index)
 700                 current = current->next;
 701
 702         return current;
 703 }
 704
 705 static int open_device(am7xxx_context *ctx,
 706                        unsigned int device_index,
 707                        libusb_device *usb_dev,
 708                        am7xxx_device **dev)
 709 {
 710         int ret;
 711         int current_configuration;
 712
 713         *dev = find_device(ctx, device_index);
 714         if (*dev == NULL) {
 715                 ret = -ENODEV;
 716                 goto out;
 717         }
 718
 719         /* the usb device has already been opened */
 720         if ((*dev)->usb_device) {
 721                 debug(ctx, "(*dev)->usb_device already set\n");
 722                 ret = 1;
 723                 goto out;
 724         }
 725
 726         ret = libusb_open(usb_dev, &((*dev)->usb_device));
 727         if (ret < 0) {
 728                 debug(ctx, "libusb_open failed: %s\n", libusb_error_name(ret));
 729                 goto out;
 730         }
 731
 732         /* XXX, the device is now open, if any of the calls below fail we need
 733          * to close it again before bailing out.
 734          */
 735
 736         current_configuration = -1;
 737         ret = libusb_get_configuration((*dev)->usb_device,
 738                                        &current_configuration);
 739         if (ret < 0) {
 740                 debug(ctx, "libusb_get_configuration failed: %s\n",
 741                       libusb_error_name(ret));
 742                 goto out_libusb_close;
 743         }
 744
 745         if (current_configuration != (*dev)->desc->configuration) {
 746                 /*
 747                  * In principle, before setting a new configuration, kernel
 748                  * drivers should be detached from _all_ interfaces; for
 749                  * example calling something like the following "invented"
 750                  * function _before_ setting the new configuration:
 751                  *
 752                  *   libusb_detach_all_kernel_drivers((*dev)->usb_device);
 753                  *
 754                  * However, in practice, this is not necessary for most
 755                  * devices as they have only one configuration.
 756                  *
 757                  * When a device only has one configuration:
 758                  *
 759                  *   - if there was a kernel driver bound to the device, it
 760                  *     had already set the configuration and the call below
 761                  *     will be skipped;
 762                  *
 763                  *   - if no kernel driver was bound to the device, the call
 764                  *     below will suceed.
 765                  */
 766                 ret = libusb_set_configuration((*dev)->usb_device,
 767                                                (*dev)->desc->configuration);
 768                 if (ret < 0) {
 769                         debug(ctx, "libusb_set_configuration failed: %s\n",
 770                               libusb_error_name(ret));
 771                         debug(ctx, "Cannot set configuration %hhu\n",
 772                               (*dev)->desc->configuration);
 773                         goto out_libusb_close;
 774                 }
 775         }
 776
 777         libusb_set_auto_detach_kernel_driver((*dev)->usb_device, 1);
 778
 779         ret = libusb_claim_interface((*dev)->usb_device,
 780                                      (*dev)->desc->interface_number);
 781         if (ret < 0) {
 782                 debug(ctx, "libusb_claim_interface failed: %s\n",
 783                       libusb_error_name(ret));
 784                 debug(ctx, "Cannot claim interface %hhu\n",
 785                       (*dev)->desc->interface_number);
 786                 goto out_libusb_close;
 787         }
 788
 789         /* Checking that the configuration has not changed, as suggested in
 790          * http://libusb.sourceforge.net/api-1.0/caveats.html
 791          */
 792         current_configuration = -1;
 793         ret = libusb_get_configuration((*dev)->usb_device,
 794                                        &current_configuration);
 795         if (ret < 0) {
 796                 debug(ctx, "libusb_get_configuration after claim failed: %s\n",
 797                       libusb_error_name(ret));
 798                 goto out_libusb_release_interface;
 799         }
 800
 801         if (current_configuration != (*dev)->desc->configuration) {
 802                 debug(ctx, "libusb configuration changed (expected: %hhu, current: %hhu\n",
 803                       (*dev)->desc->configuration, current_configuration);
 804                 ret = -EINVAL;
 805                 goto out_libusb_release_interface;
 806         }
 807 out:
 808         return ret;
 809
 810 out_libusb_release_interface:
 811         libusb_release_interface((*dev)->usb_device,
 812                                  (*dev)->desc->interface_number);
 813 out_libusb_close:
 814         libusb_close((*dev)->usb_device);
 815         (*dev)->usb_device = NULL;
 816         return ret;
 817 }
 818
 819 typedef enum {
 820         SCAN_OP_BUILD_DEVLIST,
 821         SCAN_OP_OPEN_DEVICE,
 822 } scan_op;
 823
 824 /**
 825  * This is where the central logic of multi-device support is.
 826  *
 827  * When 'op' == SCAN_OP_BUILD_DEVLIST the parameters 'open_device_index' and
 828  * 'dev' are ignored; the function returns 0 on success or a negative value
 829  * on error.
 830  *
 831  * When 'op' == SCAN_OP_OPEN_DEVICE the function opens the supported USB
 832  * device with index 'open_device_index' and returns the correspondent
 833  * am7xxx_device in the 'dev' parameter; the function returns the value from
 834  * open_device(), which is 0 on success, 1 if the device was already open or
 835  * a negative value on error.
 836  *
 837  * NOTES:
 838  * if scan_devices() fails when called with 'op' == SCAN_OP_BUILD_DEVLIST,
 839  * the caller might want to call am7xxx_shutdown() in order to remove
 840  * devices possibly added before the failure.
 841  */
 842 static int scan_devices(am7xxx_context *ctx, scan_op op,
 843                         unsigned int open_device_index, am7xxx_device **dev)
 844 {
 845         ssize_t num_devices;
 846         libusb_device **list;
 847         unsigned int current_index;
 848         int i;
 849         int ret;
 850
 851         if (ctx == NULL) {
 852                 fatal("context must not be NULL!\n");
 853                 return -EINVAL;
 854         }
 855         if (op == SCAN_OP_BUILD_DEVLIST && ctx->devices_list != NULL) {
 856                 error(ctx, "device scan done already? Abort!\n");
 857                 return -EINVAL;
 858         }
 859
 860         num_devices = libusb_get_device_list(ctx->usb_context, &list);
 861         if (num_devices < 0) {
 862                 ret = -ENODEV;
 863                 goto out;
 864         }
 865
 866         current_index = 0;
 867         for (i = 0; i < num_devices; i++) {
 868                 struct libusb_device_descriptor desc;
 869                 unsigned int j;
 870
 871                 ret = libusb_get_device_descriptor(list[i], &desc);
 872                 if (ret < 0)
 873                         continue;
 874
 875                 for (j = 0; j < ARRAY_SIZE(supported_devices); j++) {
 876                         if (desc.idVendor == supported_devices[j].vendor_id &&
 877                             desc.idProduct == supported_devices[j].product_id) {
 878
 879                                 if (op == SCAN_OP_BUILD_DEVLIST) {
 880                                         am7xxx_device *new_device;
 881                                         info(ctx, "am7xxx device found, index: %d, name: %s\n",
 882                                              current_index,
 883                                              supported_devices[j].name);
 884                                         new_device = add_new_device(ctx, &supported_devices[j]);
 885                                         if (new_device == NULL) {
 886                                                 /* XXX, the caller may want
 887                                                  * to call am7xxx_shutdown() if
 888                                                  * we fail here, as we may have
 889                                                  * added some devices already
 890                                                  */
 891                                                 debug(ctx, "Cannot create a new device\n");
 892                                                 ret = -ENODEV;
 893                                                 goto out;
 894                                         }
 895                                 } else if (op == SCAN_OP_OPEN_DEVICE &&
 896                                            current_index == open_device_index) {
 897
 898                                         ret = open_device(ctx,
 899                                                           open_device_index,
 900                                                           list[i],
 901                                                           dev);
 902                                         if (ret < 0)
 903                                                 debug(ctx, "open_device failed\n");
 904
 905                                         /* exit the loop unconditionally after
 906                                          * attempting to open the device
 907                                          * requested by the user */
 908                                         goto out;
 909                                 }
 910                                 current_index++;
 911                         }
 912                 }
 913         }
 914
 915         /* if we made it up to here when op == SCAN_OP_OPEN_DEVICE,
 916          * no devices to open had been found. */
 917         if (op == SCAN_OP_OPEN_DEVICE) {
 918                 error(ctx, "Cannot find any device to open\n");
 919                 ret = -ENODEV;
 920                 goto out;
 921         }
 922
 923         /* everything went fine when building the device list */
 924         ret = 0;
 925 out:
 926         libusb_free_device_list(list, 1);
 927         return ret;
 928 }
 929
 930 /* Device specific operations */
 931
 932 static int default_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
 933 {
 934         int ret;
 935         struct am7xxx_header h = {
 936                 .packet_type     = AM7XXX_PACKET_TYPE_POWER,
 937                 .direction       = AM7XXX_DIRECTION_OUT,
 938                 .header_data_len = sizeof(struct am7xxx_power_header),
 939                 .unknown2        = 0x3e,
 940                 .unknown3        = 0x10,
 941         };
 942
 943         switch(power) {
 944         case AM7XXX_POWER_OFF:
 945                 h.header_data.power.bit2 = 0;
 946                 h.header_data.power.bit1 = 0;
 947                 h.header_data.power.bit0 = 0;
 948                 break;
 949
 950         case AM7XXX_POWER_LOW:
 951                 h.header_data.power.bit2 = 0;
 952                 h.header_data.power.bit1 = 0;
 953                 h.header_data.power.bit0 = 1;
 954                 break;
 955
 956         case AM7XXX_POWER_MIDDLE:
 957                 h.header_data.power.bit2 = 0;
 958                 h.header_data.power.bit1 = 1;
 959                 h.header_data.power.bit0 = 0;
 960                 break;
 961
 962         case AM7XXX_POWER_HIGH:
 963                 h.header_data.power.bit2 = 0;
 964                 h.header_data.power.bit1 = 1;
 965                 h.header_data.power.bit0 = 1;
 966                 break;
 967
 968         case AM7XXX_POWER_TURBO:
 969                 h.header_data.power.bit2 = 1;
 970                 h.header_data.power.bit1 = 0;
 971                 h.header_data.power.bit0 = 0;
 972                 break;
 973
 974         default:
 975                 error(dev->ctx, "Unsupported power mode.\n");
 976                 return -EINVAL;
 977         };
 978
 979         ret = send_header(dev, &h);
 980         if (ret < 0)
 981                 return ret;
 982
 983         return 0;
 984 }
 985
 986 static int picopix_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
 987 {
 988         switch(power) {
 989         case AM7XXX_POWER_LOW:
 990                 return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_LOW);
 991
 992         case AM7XXX_POWER_MIDDLE:
 993                 return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_MEDIUM);
 994
 995         case AM7XXX_POWER_HIGH:
 996                 return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_HIGH);
 997
 998         case AM7XXX_POWER_OFF:
 999         case AM7XXX_POWER_TURBO:
1000         default:
1001                 error(dev->ctx, "Unsupported power mode.\n");
1002                 return -EINVAL;
1003         };
1004 }
1005
1006 static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
1007 {
1008         int ret;
1009         struct am7xxx_header h = {
1010                 .packet_type     = AM7XXX_PACKET_TYPE_ZOOM,
1011                 .direction       = AM7XXX_DIRECTION_OUT,
1012                 .header_data_len = sizeof(struct am7xxx_zoom_header),
1013                 .unknown2        = 0x3e,
1014                 .unknown3        = 0x10,
1015         };
1016
1017         switch(zoom) {
1018         case AM7XXX_ZOOM_ORIGINAL:
1019                 h.header_data.zoom.bit1 = 0;
1020                 h.header_data.zoom.bit0 = 0;
1021                 break;
1022
1023         case AM7XXX_ZOOM_H:
1024                 h.header_data.zoom.bit1 = 0;
1025                 h.header_data.zoom.bit0 = 1;
1026                 break;
1027
1028         case AM7XXX_ZOOM_H_V:
1029                 h.header_data.zoom.bit1 = 1;
1030                 h.header_data.zoom.bit0 = 0;
1031                 break;
1032
1033         case AM7XXX_ZOOM_TEST:
1034                 h.header_data.zoom.bit1 = 1;
1035                 h.header_data.zoom.bit0 = 1;
1036                 break;
1037
1038         case AM7XXX_ZOOM_TELE:
1039         default:
1040                 error(dev->ctx, "Unsupported zoom mode.\n");
1041                 return -EINVAL;
1042         };
1043
1044         ret = send_header(dev, &h);
1045         if (ret < 0)
1046                 return ret;
1047
1048         return 0;
1049 }
1050
1051 static int picopix_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
1052 {
1053         int ret;
1054         am7xxx_packet_type packet_type;
1055
1056         switch(zoom) {
1057         case AM7XXX_ZOOM_ORIGINAL:
1058                 packet_type = AM7XXX_PACKET_TYPE_PICOPIX_DISABLE_TI;
1059                 break;
1060
1061         case AM7XXX_ZOOM_TELE:
1062                 packet_type = AM7XXX_PACKET_TYPE_PICOPIX_ENABLE_TI;
1063                 break;
1064
1065         case AM7XXX_ZOOM_H:
1066         case AM7XXX_ZOOM_H_V:
1067         case AM7XXX_ZOOM_TEST:
1068         default:
1069                 error(dev->ctx, "Unsupported zoom mode.\n");
1070                 return -EINVAL;
1071         };
1072
1073         ret = send_command(dev, packet_type);
1074         if (ret < 0)
1075                 return ret;
1076
1077         /* The Windows drivers wait for 100ms and send the same command again,
1078          * probably to overcome a firmware deficiency */
1079         ret = msleep(100);
1080         if (ret < 0)
1081                 return ret;
1082
1083         return send_command(dev, packet_type);
1084 }
1085
1086 /* Public API */
1087
1088 AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
1089 {
1090         int ret;
1091
1092         *ctx = malloc(sizeof(**ctx));
1093         if (*ctx == NULL) {
1094                 fatal("cannot allocate the context (%s)\n", strerror(errno));
1095                 ret = -ENOMEM;
1096                 goto out;
1097         }
1098         memset(*ctx, 0, sizeof(**ctx));
1099
1100         /* Set the highest log level during initialization */
1101         (*ctx)->log_level = AM7XXX_LOG_TRACE;
1102
1103         ret = libusb_init(&((*ctx)->usb_context));
1104         if (ret < 0) {
1105                 error(*ctx, "libusb_init failed: %s\n", libusb_error_name(ret));
1106                 goto out_free_context;
1107         }
1108
1109         libusb_set_debug((*ctx)->usb_context, LIBUSB_LOG_LEVEL_INFO);
1110
1111         ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL);
1112         if (ret < 0) {
1113                 error(*ctx, "scan_devices() failed\n");
1114                 am7xxx_shutdown(*ctx);
1115                 goto out;
1116         }
1117
1118         /* Set a quieter log level as default for normal operation */
1119         (*ctx)->log_level = AM7XXX_LOG_ERROR;
1120         return 0;
1121
1122 out_free_context:
1123         free(*ctx);
1124         *ctx = NULL;
1125 out:
1126         return ret;
1127 }
1128
1129 AM7XXX_PUBLIC void am7xxx_shutdown(am7xxx_context *ctx)
1130 {
1131         am7xxx_device *current;
1132
1133         if (ctx == NULL) {
1134                 fatal("context must not be NULL!\n");
1135                 return;
1136         }
1137
1138         current = ctx->devices_list;
1139         while (current) {
1140                 am7xxx_device *next = current->next;
1141                 am7xxx_close_device(current);
1142                 free(current->device_info);
1143                 free(current);
1144                 current = next;
1145         }
1146
1147         libusb_exit(ctx->usb_context);
1148         free(ctx);
1149         ctx = NULL;
1150 }
1151
1152 AM7XXX_PUBLIC void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
1153 {
1154         ctx->log_level = log_level;
1155 }
1156
1157 AM7XXX_PUBLIC int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
1158                        unsigned int device_index)
1159 {
1160         int ret;
1161
1162         if (ctx == NULL) {
1163                 fatal("context must not be NULL!\n");
1164                 return -EINVAL;
1165         }
1166
1167         ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev);
1168         if (ret < 0) {
1169                 errno = ENODEV;
1170                 goto out;
1171         } else if (ret > 0) {
1172                 warning(ctx, "device %d already open\n", device_index);
1173                 errno = EBUSY;
1174                 ret = -EBUSY;
1175                 goto out;
1176         }
1177
1178         /* Philips/Sagemcom PicoPix projectors require that the DEVINFO packet
1179          * is the first one to be sent to the device in order for it to
1180          * successfully return the correct device information.
1181          *
1182          * So, if there is not a cached version of it (from a previous open),
1183          * we ask for device info at open time,
1184          */
1185         if ((*dev)->device_info == NULL) {
1186                 ret = am7xxx_get_device_info(*dev, NULL);
1187                 if (ret < 0)
1188                         error(ctx, "cannot get device info\n");
1189         }
1190
1191 out:
1192         return ret;
1193 }
1194
1195 AM7XXX_PUBLIC int am7xxx_close_device(am7xxx_device *dev)
1196 {
1197         if (dev == NULL) {
1198                 fatal("dev must not be NULL!\n");
1199                 return -EINVAL;
1200         }
1201         if (dev->usb_device) {
1202                 wait_for_trasfer_completed(dev);
1203                 libusb_release_interface(dev->usb_device, dev->desc->interface_number);
1204                 libusb_close(dev->usb_device);
1205                 dev->usb_device = NULL;
1206         }
1207         return 0;
1208 }
1209
1210 AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
1211                            am7xxx_device_info *device_info)
1212 {
1213         int ret;
1214         struct am7xxx_header h;
1215
1216         if (dev->device_info) {
1217                 memcpy(device_info, dev->device_info, sizeof(*device_info));
1218                 return 0;
1219         }
1220
1221         ret = send_command(dev, AM7XXX_PACKET_TYPE_DEVINFO);
1222         if (ret < 0)
1223                 return ret;
1224
1225         memset(&h, 0, sizeof(h));
1226         ret = read_header(dev, &h);
1227         if (ret < 0)
1228                 return ret;
1229
1230         if (h.packet_type != AM7XXX_PACKET_TYPE_DEVINFO) {
1231                 error(dev->ctx, "expected packet type: %d, got %d instead!\n",
1232                       AM7XXX_PACKET_TYPE_DEVINFO, h.packet_type);
1233                 errno = ENOTSUP;
1234                 return -ENOTSUP;
1235         }
1236
1237         dev->device_info = malloc(sizeof(*dev->device_info));
1238         if (dev->device_info == NULL) {
1239                 error(dev->ctx, "cannot allocate a device info (%s)\n",
1240                        strerror(errno));
1241                 return -ENOMEM;
1242         }
1243         memset(dev->device_info, 0, sizeof(*dev->device_info));
1244
1245         dev->device_info->native_width = h.header_data.devinfo.native_width;
1246         dev->device_info->native_height = h.header_data.devinfo.native_height;
1247 #if 0
1248         /* No reason to expose these in the public API until we know what they mean */
1249         dev->device_info->unknown0 = h.header_data.devinfo.unknown0;
1250         dev->device_info->unknown1 = h.header_data.devinfo.unknown1;
1251 #endif
1252
1253         return 0;
1254 }
1255
1256 AM7XXX_PUBLIC int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev,
1257                                         unsigned int upscale,
1258                                         unsigned int original_width,
1259                                         unsigned int original_height,
1260                                         unsigned int *scaled_width,
1261                                         unsigned int *scaled_height)
1262 {
1263
1264         am7xxx_device_info device_info;
1265         float width_ratio;
1266         float height_ratio;
1267         int ret;
1268
1269         ret = am7xxx_get_device_info(dev, &device_info);
1270         if (ret < 0) {
1271                 error(dev->ctx, "cannot get device info\n");
1272                 return ret;
1273         }
1274
1275         /*
1276          * Check if we need to rescale; if the input image fits the native
1277          * dimensions there is no need to, unless we want to upscale.
1278          */
1279         if (!upscale &&
1280             original_width <= device_info.native_width &&
1281             original_height <= device_info.native_height ) {
1282                 debug(dev->ctx, "CASE 0, no rescaling, the original image fits already\n");
1283                 *scaled_width = original_width;
1284                 *scaled_height = original_height;
1285                 return 0;
1286         }
1287
1288         /* Input dimensions relative to the device native dimensions */
1289         width_ratio =  (float)original_width / device_info.native_width;
1290         height_ratio = (float)original_height / device_info.native_height;
1291
1292         if (width_ratio > height_ratio) {
1293                 /*
1294                  * The input is proportionally "wider" than the device viewport
1295                  * so its height needs to be adjusted
1296                  */
1297                 debug(dev->ctx, "CASE 1, original image wider, adjust the scaled height\n");
1298                 *scaled_width = device_info.native_width;
1299                 *scaled_height = (unsigned int)lroundf(original_height / width_ratio);
1300         } else if (width_ratio < height_ratio) {
1301                 /*
1302                  * The input is proportionally "taller" than the device viewport
1303                  * so its width needs to be adjusted
1304                  */
1305                 debug(dev->ctx, "CASE 2 original image taller, adjust the scaled width\n");
1306                 *scaled_width = (unsigned int)lroundf(original_width / height_ratio);
1307                 *scaled_height = device_info.native_height;
1308         } else {
1309                 debug(dev->ctx, "CASE 3, just rescale, same aspect ratio already\n");
1310                 *scaled_width = device_info.native_width;
1311                 *scaled_height = device_info.native_height;
1312         }
1313         debug(dev->ctx, "scaled dimensions: %dx%d\n", *scaled_width, *scaled_height);
1314
1315         return 0;
1316 }
1317
1318 AM7XXX_PUBLIC int am7xxx_send_image(am7xxx_device *dev,
1319                       am7xxx_image_format format,
1320                       unsigned int width,
1321                       unsigned int height,
1322                       uint8_t *image,
1323                       unsigned int image_size)
1324 {
1325         int ret;
1326         struct am7xxx_header h = {
1327                 .packet_type     = AM7XXX_PACKET_TYPE_IMAGE,
1328                 .direction       = AM7XXX_DIRECTION_OUT,
1329                 .header_data_len = sizeof(struct am7xxx_image_header),
1330                 .unknown2        = 0x3e,
1331                 .unknown3        = 0x10,
1332                 .header_data = {
1333                         .image = {
1334                                 .format     = format,
1335                                 .width      = width,
1336                                 .height     = height,
1337                                 .image_size = image_size,
1338                         },
1339                 },
1340         };
1341
1342         ret = send_header(dev, &h);
1343         if (ret < 0)
1344                 return ret;
1345
1346         if (image == NULL || image_size == 0) {
1347                 warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
1348                 return 0;
1349         }
1350
1351         return send_data(dev, image, image_size);
1352 }
1353
1354 AM7XXX_PUBLIC int am7xxx_send_image_async(am7xxx_device *dev,
1355                                           am7xxx_image_format format,
1356                                           unsigned int width,
1357                                           unsigned int height,
1358                                           uint8_t *image,
1359                                           unsigned int image_size)
1360 {
1361         int ret;
1362         struct am7xxx_header h = {
1363                 .packet_type     = AM7XXX_PACKET_TYPE_IMAGE,
1364                 .direction       = AM7XXX_DIRECTION_OUT,
1365                 .header_data_len = sizeof(struct am7xxx_image_header),
1366                 .unknown2        = 0x3e,
1367                 .unknown3        = 0x10,
1368                 .header_data = {
1369                         .image = {
1370                                 .format     = format,
1371                                 .width      = width,
1372                                 .height     = height,
1373                                 .image_size = image_size,
1374                         },
1375                 },
1376         };
1377
1378         ret = send_header(dev, &h);
1379         if (ret < 0)
1380                 return ret;
1381
1382         if (image == NULL || image_size == 0) {
1383                 warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
1384                 return 0;
1385         }
1386
1387         return send_data_async(dev, image, image_size);
1388 }
1389
1390 AM7XXX_PUBLIC int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
1391 {
1392         if (dev->desc->ops.set_power_mode == NULL) {
1393                 warning(dev->ctx,
1394                         "setting power mode is unsupported on this device\n");
1395                 return 0;
1396         }
1397
1398         return dev->desc->ops.set_power_mode(dev, power);
1399 }
1400
1401 AM7XXX_PUBLIC int am7xxx_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
1402 {
1403         if (dev->desc->ops.set_zoom_mode == NULL) {
1404                 warning(dev->ctx,
1405                         "setting zoom mode is unsupported on this device\n");
1406                 return 0;
1407         }
1408
1409         return dev->desc->ops.set_zoom_mode(dev, zoom);
1410 }