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
  26 #include "am7xxx.h"
  27 #include "serialize.h"
  28
  29 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  30
  31 /* If we're not using GNU C, elide __attribute__
  32  * taken from: http://unixwiz.net/techtips/gnu-c-attributes.html)
  33  */
  34 #ifndef __GNUC__
  35 #  define  __attribute__(x)  /*NOTHING*/
  36 #endif
  37
  38 static void log_message(am7xxx_context *ctx,
  39                         int level,
  40                         const char *function,
  41                         int line,
  42                         const char *fmt,
  43                         ...) __attribute__ ((format (printf, 5, 6)));
  44
  45 #define fatal(...)        log_message(NULL, AM7XXX_LOG_FATAL,   __func__, __LINE__, __VA_ARGS__)
  46 #define error(ctx, ...)   log_message(ctx,  AM7XXX_LOG_ERROR,   __func__, __LINE__, __VA_ARGS__)
  47 #define warning(ctx, ...) log_message(ctx,  AM7XXX_LOG_WARNING, __func__, 0,        __VA_ARGS__)
  48 #define info(ctx, ...)    log_message(ctx,  AM7XXX_LOG_INFO,    __func__, 0,        __VA_ARGS__)
  49 #define debug(ctx, ...)   log_message(ctx,  AM7XXX_LOG_DEBUG,   __func__, 0,        __VA_ARGS__)
  50 #define trace(ctx, ...)   log_message(ctx,  AM7XXX_LOG_TRACE,   NULL,     0,        __VA_ARGS__)
  51
  52 struct am7xxx_usb_device_descriptor {
  53         const char *name;
  54         uint16_t vendor_id;
  55         uint16_t product_id;
  56 };
  57
  58 static struct am7xxx_usb_device_descriptor supported_devices[] = {
  59         {
  60                 .name       = "Acer C110",
  61                 .vendor_id  = 0x1de1,
  62                 .product_id = 0xc101,
  63         },
  64         {
  65                 .name       = "Philips/Sagemcom PicoPix 1020",
  66                 .vendor_id  = 0x21e7,
  67                 .product_id = 0x000e,
  68         },
  69 };
  70
  71 /* The header size on the wire is known to be always 24 bytes, regardless of
  72  * the memory configuration enforced by different architechtures or compilers
  73  * for struct am7xxx_header
  74  */
  75 #define AM7XXX_HEADER_WIRE_SIZE 24
  76
  77 struct _am7xxx_device {
  78         libusb_device_handle *usb_device;
  79         uint8_t buffer[AM7XXX_HEADER_WIRE_SIZE];
  80         am7xxx_context *ctx;
  81         am7xxx_device *next;
  82 };
  83
  84 struct _am7xxx_context {
  85         libusb_context *usb_context;
  86         int log_level;
  87         am7xxx_device *devices_list;
  88 };
  89
  90 typedef enum {
  91         AM7XXX_PACKET_TYPE_DEVINFO = 0x01,
  92         AM7XXX_PACKET_TYPE_IMAGE   = 0x02,
  93         AM7XXX_PACKET_TYPE_POWER   = 0x04,
  94         AM7XXX_PACKET_TYPE_UNKNOWN = 0x05,
  95 } am7xxx_packet_type;
  96
  97 struct am7xxx_generic_header {
  98         uint32_t field0;
  99         uint32_t field1;
 100         uint32_t field2;
 101         uint32_t field3;
 102 };
 103
 104 struct am7xxx_devinfo_header {
 105         uint32_t native_width;
 106         uint32_t native_height;
 107         uint32_t unknown0;
 108         uint32_t unknown1;
 109 };
 110
 111 struct am7xxx_image_header {
 112         uint32_t format;
 113         uint32_t width;
 114         uint32_t height;
 115         uint32_t image_size;
 116 };
 117
 118 struct am7xxx_power_header {
 119         uint32_t bit2;
 120         uint32_t bit1;
 121         uint32_t bit0;
 122 };
 123
 124 /*
 125  * Examples of packet headers:
 126  *
 127  * Image header:
 128  * 02 00 00 00 00 10 3e 10 01 00 00 00 20 03 00 00 e0 01 00 00 53 E8 00 00
 129  *
 130  * Power header:
 131  * 04 00 00 00 00 0c ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 132  */
 133
 134 struct am7xxx_header {
 135         uint32_t packet_type;
 136         uint8_t unknown0;
 137         uint8_t header_data_len;
 138         uint8_t unknown2;
 139         uint8_t unknown3;
 140         union {
 141                 struct am7xxx_generic_header data;
 142                 struct am7xxx_devinfo_header devinfo;
 143                 struct am7xxx_image_header image;
 144                 struct am7xxx_power_header power;
 145         } header_data;
 146 };
 147
 148
 149 #ifdef DEBUG
 150 static void debug_dump_devinfo_header(am7xxx_context *ctx, struct am7xxx_devinfo_header *d)
 151 {
 152         if (ctx == NULL || d == NULL)
 153                 return;
 154
 155         debug(ctx, "Info header:\n");
 156         debug(ctx, "\tnative_width:  0x%08x (%u)\n", d->native_width, d->native_width);
 157         debug(ctx, "\tnative_height: 0x%08x (%u)\n", d->native_height, d->native_height);
 158         debug(ctx, "\tunknown0:      0x%08x (%u)\n", d->unknown0, d->unknown0);
 159         debug(ctx, "\tunknown1:      0x%08x (%u)\n", d->unknown1, d->unknown1);
 160 }
 161
 162 static void debug_dump_image_header(am7xxx_context *ctx, struct am7xxx_image_header *i)
 163 {
 164         if (ctx == NULL || i == NULL)
 165                 return;
 166
 167         debug(ctx, "Image header:\n");
 168         debug(ctx, "\tformat:     0x%08x (%u)\n", i->format, i->format);
 169         debug(ctx, "\twidth:      0x%08x (%u)\n", i->width, i->width);
 170         debug(ctx, "\theight:     0x%08x (%u)\n", i->height, i->height);
 171         debug(ctx, "\timage size: 0x%08x (%u)\n", i->image_size, i->image_size);
 172 }
 173
 174 static void debug_dump_power_header(am7xxx_context *ctx, struct am7xxx_power_header *p)
 175 {
 176         if (ctx == NULL || p == NULL)
 177                 return;
 178
 179         debug(ctx, "Power header:\n");
 180         debug(ctx, "\tbit2: 0x%08x (%u)\n", p->bit2, p->bit2);
 181         debug(ctx, "\tbit1: 0x%08x (%u)\n", p->bit1, p->bit1);
 182         debug(ctx, "\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
 183 }
 184
 185 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
 186 {
 187         if (ctx == NULL || h == NULL)
 188                 return;
 189
 190         debug(ctx, "BEGIN\n");
 191         debug(ctx, "packet_type:     0x%08x (%u)\n", h->packet_type, h->packet_type);
 192         debug(ctx, "unknown0:        0x%02hhx (%hhu)\n", h->unknown0, h->unknown0);
 193         debug(ctx, "header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len);
 194         debug(ctx, "unknown2:        0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
 195         debug(ctx, "unknown3:        0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
 196
 197         switch(h->packet_type) {
 198         case AM7XXX_PACKET_TYPE_DEVINFO:
 199                 debug_dump_devinfo_header(ctx, &(h->header_data.devinfo));
 200                 break;
 201
 202         case AM7XXX_PACKET_TYPE_IMAGE:
 203                 debug_dump_image_header(ctx, &(h->header_data.image));
 204                 break;
 205
 206         case AM7XXX_PACKET_TYPE_POWER:
 207                 debug_dump_power_header(ctx, &(h->header_data.power));
 208                 break;
 209
 210         default:
 211                 debug(ctx, "Packet type not supported!\n");
 212                 break;
 213         }
 214         debug(ctx, "END\n\n");
 215 }
 216
 217 static inline unsigned int in_80chars(unsigned int i)
 218 {
 219         /* The 3 below is the length of "xx " where xx is the hex string
 220          * representation of a byte */
 221         return ((i+1) % (80/3));
 222 }
 223
 224 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
 225                               uint8_t *buffer, unsigned int len)
 226 {
 227         unsigned int i;
 228
 229         if (ctx == NULL || buffer == NULL || len == 0)
 230                 return;
 231
 232         trace(ctx, "\n");
 233         if (message)
 234                 trace(ctx, "%s\n", message);
 235
 236         for (i = 0; i < len; i++) {
 237                 trace(ctx, "%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n');
 238         }
 239         trace(ctx, "\n");
 240 }
 241 #else
 242 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
 243 {
 244         (void)ctx;
 245         (void)h;
 246 }
 247 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
 248                               uint8_t *buffer, unsigned int len)
 249 {
 250         (void)ctx;
 251         (void)message;
 252         (void)buffer;
 253         (void)len;
 254 }
 255 #endif /* DEBUG */
 256
 257 static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 258 {
 259         int ret;
 260         int transferred = 0;
 261
 262         ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
 263         if (ret != 0 || (unsigned int)transferred != len) {
 264                 error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
 265                       ret, transferred, len);
 266                 return ret;
 267         }
 268
 269         trace_dump_buffer(dev->ctx, "<-- received", buffer, len);
 270
 271         return 0;
 272 }
 273
 274 static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 275 {
 276         int ret;
 277         int transferred = 0;
 278
 279         trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
 280
 281         ret = libusb_bulk_transfer(dev->usb_device, 1, buffer, len, &transferred, 0);
 282         if (ret != 0 || (unsigned int)transferred != len) {
 283                 error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
 284                       ret, transferred, len);
 285                 return ret;
 286         }
 287
 288         return 0;
 289 }
 290
 291 static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
 292 {
 293         uint8_t **buffer_iterator = &buffer;
 294
 295         put_le32(h->packet_type, buffer_iterator);
 296         put_8(h->unknown0, buffer_iterator);
 297         put_8(h->header_data_len, buffer_iterator);
 298         put_8(h->unknown2, buffer_iterator);
 299         put_8(h->unknown3, buffer_iterator);
 300         put_le32(h->header_data.data.field0, buffer_iterator);
 301         put_le32(h->header_data.data.field1, buffer_iterator);
 302         put_le32(h->header_data.data.field2, buffer_iterator);
 303         put_le32(h->header_data.data.field3, buffer_iterator);
 304 }
 305
 306 static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h)
 307 {
 308         uint8_t **buffer_iterator = &buffer;
 309
 310         h->packet_type = get_le32(buffer_iterator);
 311         h->unknown0 = get_8(buffer_iterator);
 312         h->header_data_len = get_8(buffer_iterator);
 313         h->unknown2 = get_8(buffer_iterator);
 314         h->unknown3 = get_8(buffer_iterator);
 315         h->header_data.data.field0 = get_le32(buffer_iterator);
 316         h->header_data.data.field1 = get_le32(buffer_iterator);
 317         h->header_data.data.field2 = get_le32(buffer_iterator);
 318         h->header_data.data.field3 = get_le32(buffer_iterator);
 319 }
 320
 321 static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
 322 {
 323         int ret;
 324
 325         ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
 326         if (ret < 0)
 327                 goto out;
 328
 329         unserialize_header(dev->buffer, h);
 330
 331         debug_dump_header(dev->ctx, h);
 332
 333         ret = 0;
 334
 335 out:
 336         return ret;
 337 }
 338
 339 static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
 340 {
 341         int ret;
 342
 343         debug_dump_header(dev->ctx, h);
 344
 345         serialize_header(h, dev->buffer);
 346         ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
 347         if (ret < 0)
 348                 error(dev->ctx, "failed to send data\n");
 349
 350         return ret;
 351 }
 352
 353 /* When level == AM7XXX_LOG_FATAL do not check the log_level from the context
 354  * and print the message unconditionally, this makes it possible to print
 355  * fatal messages even early on initialization, before the context has been
 356  * set up */
 357 static void log_message(am7xxx_context *ctx,
 358                         int level,
 359                         const char *function,
 360                         int line,
 361                         const char *fmt,
 362                         ...)
 363 {
 364         va_list ap;
 365
 366         if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
 367                 if (function) {
 368                         fprintf(stderr, "%s", function);
 369                         if (line)
 370                                 fprintf(stderr, "[%d]", line);
 371                         fprintf(stderr, ": ");
 372                 }
 373
 374                 va_start(ap, fmt);
 375                 vfprintf(stderr, fmt, ap);
 376                 va_end(ap);
 377         }
 378
 379         return;
 380 }
 381
 382 static am7xxx_device *add_new_device(am7xxx_context *ctx)
 383 {
 384         am7xxx_device **devices_list;
 385         am7xxx_device *new_device;
 386
 387         if (ctx == NULL) {
 388                 fatal("context must not be NULL!\n");
 389                 return NULL;
 390         }
 391
 392         devices_list = &(ctx->devices_list);
 393
 394         new_device = malloc(sizeof(*new_device));
 395         if (new_device == NULL) {
 396                 fatal("cannot allocate a new device (%s)\n", strerror(errno));
 397                 return NULL;
 398         }
 399         memset(new_device, 0, sizeof(*new_device));
 400
 401         new_device->ctx = ctx;
 402
 403         if (*devices_list == NULL) {
 404                 *devices_list = new_device;
 405         } else {
 406                 am7xxx_device *prev = *devices_list;
 407                 while (prev->next)
 408                         prev = prev->next;
 409                 prev->next = new_device;
 410         }
 411         return new_device;
 412 }
 413
 414 static am7xxx_device *find_device(am7xxx_context *ctx,
 415                                   unsigned int device_index)
 416 {
 417         unsigned int i = 0;
 418         am7xxx_device *current;
 419
 420         if (ctx == NULL) {
 421                 fatal("context must not be NULL!\n");
 422                 return NULL;
 423         }
 424
 425         current = ctx->devices_list;
 426         while (current && i++ < device_index)
 427                 current = current->next;
 428
 429         return current;
 430 }
 431
 432 typedef enum {
 433         SCAN_OP_BUILD_DEVLIST,
 434         SCAN_OP_OPEN_DEVICE,
 435 } scan_op;
 436
 437 /**
 438  * This is where the central logic of multi-device support is.
 439  *
 440  * When 'op' == SCAN_OP_BUILD_DEVLIST the parameters 'open_device_index' and
 441  * 'dev' are ignored; the function returns 0 on success and a negative value
 442  * on error.
 443  *
 444  * When 'op' == SCAN_OP_OPEN_DEVICE the function opens the supported USB
 445  * device with index 'open_device_index' and returns the correspondent
 446  * am7xxx_device in the 'dev' parameter; the function returns 0 on success,
 447  * 1 if the device was already open and a negative value on error.
 448  *
 449  * NOTES:
 450  * if scan_devices() fails when called with 'op' == SCAN_OP_BUILD_DEVLIST,
 451  * the caller might want to call am7xxx_shutdown() in order to remove
 452  * devices possibly added before the failure.
 453  */
 454 static int scan_devices(am7xxx_context *ctx, scan_op op,
 455                         unsigned int open_device_index, am7xxx_device **dev)
 456 {
 457         int num_devices;
 458         libusb_device** list;
 459         unsigned int current_index;
 460         int i;
 461         int ret;
 462
 463         if (ctx == NULL) {
 464                 fatal("context must not be NULL!\n");
 465                 return -EINVAL;
 466         }
 467         if (op == SCAN_OP_BUILD_DEVLIST && ctx->devices_list != NULL) {
 468                 error(ctx, "device scan done already? Abort!\n");
 469                 return -EINVAL;
 470         }
 471
 472         num_devices = libusb_get_device_list(ctx->usb_context, &list);
 473         if (num_devices < 0) {
 474                 ret = -ENODEV;
 475                 goto out;
 476         }
 477
 478         current_index = 0;
 479         for (i = 0; i < num_devices; i++) {
 480                 struct libusb_device_descriptor desc;
 481                 unsigned int j;
 482
 483                 ret = libusb_get_device_descriptor(list[i], &desc);
 484                 if (ret < 0)
 485                         continue;
 486
 487                 for (j = 0; j < ARRAY_SIZE(supported_devices); j++) {
 488                         if (desc.idVendor == supported_devices[j].vendor_id
 489                             && desc.idProduct == supported_devices[j].product_id) {
 490
 491                                 if (op == SCAN_OP_BUILD_DEVLIST) {
 492                                         am7xxx_device *new_device;
 493                                         info(ctx, "am7xxx device found, index: %d, name: %s\n",
 494                                              current_index,
 495                                              supported_devices[j].name);
 496                                         new_device = add_new_device(ctx);
 497                                         if (new_device == NULL) {
 498                                                 /* XXX, the caller may want
 499                                                  * to call am7xxx_shutdown() if
 500                                                  * we fail here, as we may have
 501                                                  * added some devices already
 502                                                  */
 503                                                 debug(ctx, "Cannot create a new device\n");
 504                                                 ret = -ENODEV;
 505                                                 goto out;
 506                                         }
 507                                 } else if (op == SCAN_OP_OPEN_DEVICE &&
 508                                            current_index == open_device_index) {
 509
 510                                         *dev = find_device(ctx, open_device_index);
 511                                         if (*dev == NULL) {
 512                                                 ret = -ENODEV;
 513                                                 goto out;
 514                                         }
 515
 516                                         /* the usb device has already been opened */
 517                                         if ((*dev)->usb_device) {
 518                                                 debug(ctx, "(*dev)->usb_device already set\n");
 519                                                 ret = 1;
 520                                                 goto out;
 521                                         }
 522
 523                                         ret = libusb_open(list[i], &((*dev)->usb_device));
 524                                         if (ret < 0) {
 525                                                 debug(ctx, "libusb_open failed\n");
 526                                                 goto out;
 527                                         }
 528
 529                                         libusb_set_configuration((*dev)->usb_device, 1);
 530                                         libusb_claim_interface((*dev)->usb_device, 0);
 531                                         goto out;
 532                                 }
 533                                 current_index++;
 534                         }
 535                 }
 536         }
 537
 538         /* if we made it up to here we didn't find any device to open */
 539         if (op == SCAN_OP_OPEN_DEVICE) {
 540                 error(ctx, "Cannot find any device to open\n");
 541                 ret = -ENODEV;
 542                 goto out;
 543         }
 544
 545         /* everything went fine when building the device list */
 546         ret = 0;
 547 out:
 548         libusb_free_device_list(list, 1);
 549         return ret;
 550 }
 551
 552 int am7xxx_init(am7xxx_context **ctx)
 553 {
 554         int ret = 0;
 555
 556         *ctx = malloc(sizeof(**ctx));
 557         if (*ctx == NULL) {
 558                 fatal("cannot allocate the context (%s)\n", strerror(errno));
 559                 ret = -ENOMEM;
 560                 goto out;
 561         }
 562         memset(*ctx, 0, sizeof(**ctx));
 563
 564         /* Set the highest log level during initialization */
 565         (*ctx)->log_level = AM7XXX_LOG_TRACE;
 566
 567         ret = libusb_init(&((*ctx)->usb_context));
 568         if (ret < 0)
 569                 goto out_free_context;
 570
 571         libusb_set_debug((*ctx)->usb_context, 3);
 572
 573         ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL);
 574         if (ret < 0) {
 575                 error(*ctx, "scan_devices() failed\n");
 576                 am7xxx_shutdown(*ctx);
 577                 goto out;
 578         }
 579
 580         /* Set a quieter log level as default for normal operation */
 581         (*ctx)->log_level = AM7XXX_LOG_ERROR;
 582         return 0;
 583
 584 out_free_context:
 585         free(*ctx);
 586         *ctx = NULL;
 587 out:
 588         return ret;
 589 }
 590
 591 void am7xxx_shutdown(am7xxx_context *ctx)
 592 {
 593         am7xxx_device *current;
 594
 595         if (ctx == NULL) {
 596                 fatal("context must not be NULL!\n");
 597                 return;
 598         }
 599
 600         current = ctx->devices_list;
 601         while (current) {
 602                 am7xxx_device *next = current->next;
 603                 am7xxx_close_device(current);
 604                 free(current);
 605                 current = next;
 606         }
 607
 608         libusb_exit(ctx->usb_context);
 609         free(ctx);
 610         ctx = NULL;
 611 }
 612
 613 void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
 614 {
 615         ctx->log_level = log_level;
 616 }
 617
 618 int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
 619                        unsigned int device_index)
 620 {
 621         int ret;
 622
 623         if (ctx == NULL) {
 624                 fatal("context must not be NULL!\n");
 625                 return -EINVAL;
 626         }
 627
 628         ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev);
 629         if (ret < 0) {
 630                 errno = ENODEV;
 631         } else if (ret > 0) {
 632                 warning(ctx, "device %d already open\n", device_index);
 633                 errno = EBUSY;
 634                 ret = -EBUSY;
 635         }
 636
 637         return ret;
 638 }
 639
 640 int am7xxx_close_device(am7xxx_device *dev)
 641 {
 642         if (dev == NULL) {
 643                 fatal("dev must not be NULL!\n");
 644                 return -EINVAL;
 645         }
 646         if (dev->usb_device) {
 647                 libusb_release_interface(dev->usb_device, 0);
 648                 libusb_close(dev->usb_device);
 649                 dev->usb_device = NULL;
 650         }
 651         return 0;
 652 }
 653
 654 int am7xxx_get_device_info(am7xxx_device *dev,
 655                            am7xxx_device_info *device_info)
 656 {
 657         int ret;
 658         struct am7xxx_header h = {
 659                 .packet_type     = AM7XXX_PACKET_TYPE_DEVINFO,
 660                 .unknown0        = 0x00,
 661                 .header_data_len = 0x00,
 662                 .unknown2        = 0x3e,
 663                 .unknown3        = 0x10,
 664                 .header_data = {
 665                         .devinfo = {
 666                                 .native_width  = 0,
 667                                 .native_height = 0,
 668                                 .unknown0      = 0,
 669                                 .unknown1      = 0,
 670                         },
 671                 },
 672         };
 673
 674         ret = send_header(dev, &h);
 675         if (ret < 0)
 676                 return ret;
 677
 678         ret = read_header(dev, &h);
 679         if (ret < 0)
 680                 return ret;
 681
 682         device_info->native_width = h.header_data.devinfo.native_width;
 683         device_info->native_height = h.header_data.devinfo.native_height;
 684 #if 0
 685         /* No reason to expose these in the public API until we know what they mean */
 686         device_info->unknown0 = h.header_data.devinfo.unknown0;
 687         device_info->unknown1 = h.header_data.devinfo.unknown1;
 688 #endif
 689
 690         return 0;
 691 }
 692
 693 int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev,
 694                                         unsigned int upscale,
 695                                         unsigned int original_width,
 696                                         unsigned int original_height,
 697                                         unsigned int *scaled_width,
 698                                         unsigned int *scaled_height)
 699 {
 700
 701         am7xxx_device_info device_info;
 702         float width_ratio;
 703         float height_ratio;
 704         int ret;
 705
 706         ret = am7xxx_get_device_info(dev, &device_info);
 707         if (ret < 0) {
 708                 error(dev->ctx, "cannot get device info\n");
 709                 return ret;
 710         }
 711
 712         /*
 713          * Check if we need to rescale; if the input image fits the native
 714          * dimensions there is no need to, unless we want to upscale.
 715          */
 716         if (!upscale &&
 717             original_width <= device_info.native_width &&
 718             original_height <= device_info.native_height ) {
 719                 debug(dev->ctx, "CASE 0, no rescaling, the original image fits already\n");
 720                 *scaled_width = original_width;
 721                 *scaled_height = original_height;
 722                 return 0;
 723         }
 724
 725         /* Input dimensions relative to the device native dimensions */
 726         width_ratio =  (float)original_width / device_info.native_width;
 727         height_ratio = (float)original_height / device_info.native_height;
 728
 729         if (width_ratio > height_ratio) {
 730                 /*
 731                  * The input is proportionally "wider" than the device viewport
 732                  * so it's height needs to be adjusted
 733                  */
 734                 debug(dev->ctx, "CASE 1, original image wider, adjust the scaled height\n");
 735                 *scaled_width = device_info.native_width;
 736                 *scaled_height = (unsigned int)(original_height / width_ratio);
 737         } else if (width_ratio < height_ratio) {
 738                 /*
 739                  * The input is proportionally "taller" than the device viewport
 740                  * so its width needs to be adjusted
 741                  */
 742                 debug(dev->ctx, "CASE 2 original image taller, adjust the scaled width\n");
 743                 *scaled_width = (unsigned int)(original_width / height_ratio);
 744                 *scaled_height = device_info.native_height;
 745         } else {
 746                 debug(dev->ctx, "CASE 3, just rescale, same aspect ratio already\n");
 747                 *scaled_width = device_info.native_width;
 748                 *scaled_height = device_info.native_height;
 749         }
 750         debug(dev->ctx, "scaled dimensions: %dx%d\n", *scaled_width, *scaled_height);
 751
 752         return 0;
 753 }
 754
 755 int am7xxx_send_image(am7xxx_device *dev,
 756                       am7xxx_image_format format,
 757                       unsigned int width,
 758                       unsigned int height,
 759                       uint8_t *image,
 760                       unsigned int image_size)
 761 {
 762         int ret;
 763         struct am7xxx_header h = {
 764                 .packet_type     = AM7XXX_PACKET_TYPE_IMAGE,
 765                 .unknown0        = 0x00,
 766                 .header_data_len = sizeof(struct am7xxx_image_header),
 767                 .unknown2        = 0x3e,
 768                 .unknown3        = 0x10,
 769                 .header_data = {
 770                         .image = {
 771                                 .format     = format,
 772                                 .width      = width,
 773                                 .height     = height,
 774                                 .image_size = image_size,
 775                         },
 776                 },
 777         };
 778
 779         ret = send_header(dev, &h);
 780         if (ret < 0)
 781                 return ret;
 782
 783         if (image == NULL || image_size == 0) {
 784                 warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
 785                 return 0;
 786         }
 787
 788         return send_data(dev, image, image_size);
 789 }
 790
 791 int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode mode)
 792 {
 793         int ret;
 794         struct am7xxx_header h = {
 795                 .packet_type     = AM7XXX_PACKET_TYPE_POWER,
 796                 .unknown0        = 0x00,
 797                 .header_data_len = sizeof(struct am7xxx_power_header),
 798                 .unknown2        = 0x3e,
 799                 .unknown3        = 0x10,
 800         };
 801
 802         switch(mode) {
 803         case AM7XXX_POWER_OFF:
 804                 h.header_data.power.bit2 = 0;
 805                 h.header_data.power.bit1 = 0;
 806                 h.header_data.power.bit0 = 0;
 807                 break;
 808
 809         case AM7XXX_POWER_LOW:
 810                 h.header_data.power.bit2 = 0;
 811                 h.header_data.power.bit1 = 0;
 812                 h.header_data.power.bit0 = 1;
 813
 814         case AM7XXX_POWER_MIDDLE:
 815                 h.header_data.power.bit2 = 0;
 816                 h.header_data.power.bit1 = 1;
 817                 h.header_data.power.bit0 = 0;
 818                 break;
 819
 820         case AM7XXX_POWER_HIGH:
 821                 h.header_data.power.bit2 = 0;
 822                 h.header_data.power.bit1 = 1;
 823                 h.header_data.power.bit0 = 1;
 824                 break;
 825
 826         case AM7XXX_POWER_TURBO:
 827                 h.header_data.power.bit2 = 1;
 828                 h.header_data.power.bit1 = 0;
 829                 h.header_data.power.bit0 = 0;
 830                 break;
 831
 832         default:
 833                 error(dev->ctx, "Power mode not supported!\n");
 834                 return -EINVAL;
 835         };
 836
 837         ret = send_header(dev, &h);
 838         if (ret < 0)
 839                 return ret;
 840
 841         return 0;
 842 }