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