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 <errno.h>
  22
  23 #include "am7xxx.h"
  24 #include "serialize.h"
  25
  26 #define AM7XXX_VENDOR_ID  0x1de1
  27 #define AM7XXX_PRODUCT_ID 0xc101
  28
  29 static void dump_image_header(struct am7xxx_image_header *i)
  30 {
  31         if (i == NULL)
  32                 return;
  33
  34         printf("Image header:\n");
  35         printf("\tformat:     0x%08x (%u)\n", i->format, i->format);
  36         printf("\twidth:      0x%08x (%u)\n", i->width, i->width);
  37         printf("\theight:     0x%08x (%u)\n", i->height, i->height);
  38         printf("\timage size: 0x%08x (%u)\n", i->image_size, i->image_size);
  39 }
  40
  41 static void dump_power_header(struct am7xxx_power_header *p)
  42 {
  43         if (p == NULL)
  44                 return;
  45
  46         printf("Power header:\n");
  47         printf("\tbit2: 0x%08x (%u)\n", p->bit2, p->bit2);
  48         printf("\tbit1: 0x%08x (%u)\n", p->bit1, p->bit1);
  49         printf("\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
  50 }
  51
  52 static void dump_header(struct am7xxx_header *h)
  53 {
  54         if (h == NULL)
  55                 return;
  56
  57         printf("packet_type:     0x%08x (%u)\n", h->packet_type, h->packet_type);
  58         printf("unknown0:        0x%02hhx (%hhu)\n", h->unknown0, h->unknown0);
  59         printf("header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len);
  60         printf("unknown2:        0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
  61         printf("unknown3:        0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
  62
  63         switch(h->packet_type) {
  64         case AM7XXX_PACKET_TYPE_IMAGE:
  65                 dump_image_header(&(h->header_data.image));
  66                 break;
  67
  68         case AM7XXX_PACKET_TYPE_POWER:
  69                 dump_power_header(&(h->header_data.power));
  70                 break;
  71
  72         default:
  73                 printf("Packet type not supported!\n");
  74                 break;
  75         }
  76
  77         fflush(stdout);
  78 }
  79
  80 static inline unsigned int in_80chars(unsigned int i)
  81 {
  82         /* The 3 below is the length of "xx " where xx is the hex string
  83          * representation of a byte */
  84         return ((i+1) % (80/3));
  85 }
  86
  87 static void dump_buffer(uint8_t *buffer, unsigned int len)
  88 {
  89         unsigned int i;
  90
  91         if (buffer == NULL || len == 0)
  92                 return;
  93
  94         for (i = 0; i < len; i++) {
  95                 printf("%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n');
  96         }
  97         fflush(stdout);
  98 }
  99
 100 static int send_data(am7xxx_device dev, uint8_t *buffer, unsigned int len)
 101 {
 102         int ret;
 103         int transferred;
 104
 105 #if DEBUG
 106         dump_buffer(buffer, len);
 107         printf("\n");
 108 #endif
 109
 110         ret = libusb_bulk_transfer(dev, 1, buffer, len, &transferred, 0);
 111         if (ret != 0 || (unsigned int)transferred != len) {
 112                 fprintf(stderr, "Error: ret: %d\ttransferred: %d (expected %u)\n",
 113                         ret, transferred, len);
 114                 return ret;
 115         }
 116
 117         return 0;
 118 }
 119
 120 static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
 121 {
 122         uint8_t **buffer_iterator = &buffer;
 123
 124         put_le32(h->packet_type, buffer_iterator);
 125         put_8(h->unknown0, buffer_iterator);
 126         put_8(h->header_data_len, buffer_iterator);
 127         put_8(h->unknown2, buffer_iterator);
 128         put_8(h->unknown3, buffer_iterator);
 129         put_le32(h->header_data.data.field0, buffer_iterator);
 130         put_le32(h->header_data.data.field1, buffer_iterator);
 131         put_le32(h->header_data.data.field2, buffer_iterator);
 132         put_le32(h->header_data.data.field3, buffer_iterator);
 133 }
 134
 135 static int send_header(am7xxx_device dev, struct am7xxx_header *h)
 136 {
 137         uint8_t *buffer;
 138         int ret;
 139
 140 #if DEBUG
 141         dump_header(h);
 142         printf("\n");
 143 #endif
 144
 145         buffer = calloc(AM7XXX_HEADER_WIRE_SIZE, 1);
 146         if (buffer == NULL) {
 147                 perror("calloc buffer");
 148                 return -ENOMEM;
 149         }
 150
 151         serialize_header(h, buffer);
 152         ret = send_data(dev, buffer, AM7XXX_HEADER_WIRE_SIZE);
 153         if (ret < 0)
 154                 fprintf(stderr, "send_header: failed to send data.\n");
 155
 156         free(buffer);
 157         return ret;
 158 }
 159
 160 am7xxx_device am7xxx_init(void)
 161 {
 162         am7xxx_device dev;
 163
 164         libusb_init(NULL);
 165         libusb_set_debug(NULL, 3);
 166
 167         dev = libusb_open_device_with_vid_pid(NULL,
 168                                               AM7XXX_VENDOR_ID,
 169                                               AM7XXX_PRODUCT_ID);
 170         if (dev == NULL) {
 171                 errno = ENODEV;
 172                 perror("libusb_open_device_with_vid_pid");
 173                 goto out_libusb_exit;
 174         }
 175
 176         libusb_set_configuration(dev, 1);
 177         libusb_claim_interface(dev, 0);
 178
 179         return dev;
 180
 181 out_libusb_exit:
 182         libusb_exit(NULL);
 183         return NULL;
 184 }
 185
 186 void am7xxx_shutdown(am7xxx_device dev)
 187 {
 188         if (dev) {
 189                 libusb_close(dev);
 190                 libusb_exit(NULL);
 191         }
 192 }
 193
 194 int am7xxx_send_image(am7xxx_device dev,
 195                       am7xxx_image_format format,
 196                       unsigned int width,
 197                       unsigned int height,
 198                       uint8_t *image,
 199                       unsigned int size)
 200 {
 201         int ret;
 202         struct am7xxx_header h = {
 203                 .packet_type     = AM7XXX_PACKET_TYPE_IMAGE,
 204                 .unknown0        = 0x00,
 205                 .header_data_len = sizeof(struct am7xxx_image_header),
 206                 .unknown2        = 0x3e,
 207                 .unknown3        = 0x10,
 208                 .header_data = {
 209                         .image = {
 210                                 .format     = format,
 211                                 .width      = width,
 212                                 .height     = height,
 213                                 .image_size = size,
 214                         },
 215                 },
 216         };
 217
 218         ret = send_header(dev, &h);
 219         if (ret < 0)
 220                 return ret;
 221
 222         if (image == NULL || size == 0)
 223                 return 0;
 224
 225         return send_data(dev, image, size);
 226 }
 227
 228 int am7xxx_set_power_mode(am7xxx_device dev, am7xxx_power_mode mode)
 229 {
 230         int ret;
 231         struct am7xxx_header h = {
 232                 .packet_type     = AM7XXX_PACKET_TYPE_POWER,
 233                 .unknown0        = 0x00,
 234                 .header_data_len = sizeof(struct am7xxx_power_header),
 235                 .unknown2        = 0x3e,
 236                 .unknown3        = 0x10,
 237         };
 238
 239         switch(mode) {
 240         case AM7XXX_POWER_OFF:
 241                 h.header_data.power.bit2 = 0;
 242                 h.header_data.power.bit1 = 0;
 243                 h.header_data.power.bit0 = 0;
 244                 break;
 245
 246         case AM7XXX_POWER_LOW:
 247                 h.header_data.power.bit2 = 0;
 248                 h.header_data.power.bit1 = 0;
 249                 h.header_data.power.bit0 = 1;
 250
 251         case AM7XXX_POWER_MIDDLE:
 252                 h.header_data.power.bit2 = 0;
 253                 h.header_data.power.bit1 = 1;
 254                 h.header_data.power.bit0 = 0;
 255                 break;
 256
 257         case AM7XXX_POWER_HIGH:
 258                 h.header_data.power.bit2 = 0;
 259                 h.header_data.power.bit1 = 1;
 260                 h.header_data.power.bit0 = 1;
 261                 break;
 262
 263         case AM7XXX_POWER_TURBO:
 264                 h.header_data.power.bit2 = 1;
 265                 h.header_data.power.bit1 = 0;
 266                 h.header_data.power.bit0 = 0;
 267                 break;
 268
 269         default:
 270                 fprintf(stderr, "Unsupported power mode.\n");
 271                 return -EINVAL;
 272         };
 273
 274         ret = send_header(dev, &h);
 275         if (ret < 0)
 276                 return ret;
 277
 278         return 0;
 279 }