git.rot13.org Git - librfid/blob - src/rfid_reader_spidev.c

   1 /* Direct spi for RC632 transport layer
   2  * (based on openpcd reader)
   3  *
   4  * (C) 2007 by Frederic RODO <f.rodo@til-technologies.fr>
   5  *
   6  * This reader use the Linux's spidev interface, so it need a least
   7  * kernel 2.6.22
   8  */
   9
  10 /*
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License version 2
  13  *  as published by the Free Software Foundation
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, write to the Free Software
  22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  */
  24
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <string.h>
  28 #include <errno.h>
  29
  30 #include <fcntl.h>
  31 #include <sys/ioctl.h>
  32 #include <linux/types.h>
  33 #include <linux/spi/spidev.h>
  34
  35 #include <librfid/rfid.h>
  36 #include <librfid/rfid_reader.h>
  37 #include <librfid/rfid_asic.h>
  38 #include <librfid/rfid_asic_rc632.h>
  39 #include <librfid/rfid_reader_spidev.h>
  40 #include <librfid/rfid_layer2.h>
  41 #include <librfid/rfid_protocol.h>
  42
  43 /* FIXME */
  44 #include "rc632.h"
  45 static int spidev_fd;
  46
  47 struct spi_ioc_transfer xfer[1];
  48
  49 /* 256bytes max FSD/FSC, plus 1 bytes header, plus 10 bytes reserve */
  50 #define SENDBUF_LEN     (256+1+10)
  51 #define RECVBUF_LEN     SENDBUF_LEN
  52 static char snd_buf[SENDBUF_LEN];
  53 static char rcv_buf[RECVBUF_LEN];
  54
  55 static int spidev_read(unsigned char reg, unsigned char len,
  56                        unsigned char *buf)
  57 {
  58         int ret;
  59
  60         if (!len)
  61                 return -EINVAL;
  62
  63         snd_buf[0] = (reg<<1) | 0x80;
  64         if (len > 1)
  65                 memset(&snd_buf[1], reg<<1 , len-1);
  66         snd_buf[len] = 0;
  67
  68         /* prepare spi buffer */
  69         xfer[0].tx_buf = (__u64) snd_buf;
  70         xfer[0].rx_buf = (__u64) rcv_buf;
  71         xfer[0].len = len + 1;
  72
  73         ret = ioctl(spidev_fd, SPI_IOC_MESSAGE(1), xfer);
  74         if (ret < 0) {
  75                 DEBUGPC("ERROR sending command\n");
  76                 return ret;
  77         } else if (ret != (len + 1)) {
  78                 DEBUGPC("ERROR sending command bad length\n");
  79                 return -EINVAL;
  80         }
  81
  82         memcpy(buf, &rcv_buf[1], len);
  83
  84         return len;
  85 }
  86
  87 static int spidev_write(unsigned char reg, unsigned char len,
  88                        const unsigned char *buf)
  89 {
  90         int ret;
  91
  92         if (!len)
  93                 return -EINVAL;
  94
  95         snd_buf[0] = (reg << 1) & 0x7E;
  96         memcpy(&snd_buf[1], buf, len);
  97
  98         /* prepare spi buffer */
  99         xfer[0].tx_buf = (__u64) snd_buf;
 100         xfer[0].rx_buf = (__u64) NULL;
 101         xfer[0].len = len + 1;
 102
 103         ret = ioctl(spidev_fd, SPI_IOC_MESSAGE(1), xfer);
 104         if (ret < 0) {
 105                 DEBUGPC("ERROR sending command\n");
 106                 return ret;
 107         }
 108         else if (ret != len+1)
 109                 return -EINVAL;
 110
 111         return len;
 112 }
 113
 114 static int spidev_reg_read(struct rfid_asic_transport_handle *rath,
 115                            unsigned char reg, unsigned char *value)
 116 {
 117         int ret;
 118
 119         ret = spidev_read(reg, 1, value);
 120         if (ret < 0)
 121                 return ret;
 122         DEBUGP("%s reg = 0x%02x, val = 0x%02x\n", __FUNCTION__, reg, *value);
 123
 124         return 1;
 125 }
 126
 127 static int spidev_reg_write(struct rfid_asic_transport_handle *rath,
 128                             unsigned char reg, unsigned char value)
 129 {
 130         int ret;
 131
 132         ret = spidev_write(reg, 1, &value);
 133         if (ret < 0)
 134                 return ret;
 135
 136         DEBUGP("%s reg = 0x%02x, val = 0x%02x\n", __FUNCTION__, reg, value);
 137
 138         return 1;
 139 }
 140
 141 static int spidev_fifo_read(struct rfid_asic_transport_handle *rath,
 142                             unsigned char len, unsigned char *buf)
 143 {
 144         int ret;
 145
 146         ret = spidev_read(2, len, buf);
 147         if (ret < 0)
 148                 return ret;
 149
 150         DEBUGP("%s len=%u, val=%s\n", __FUNCTION__, len,
 151                rfid_hexdump(buf, len));
 152
 153         return len;
 154 }
 155
 156 static int spidev_fifo_write(struct rfid_asic_transport_handle *rath,
 157                              unsigned char len, const unsigned char *buf,
 158                              unsigned char flags)
 159 {
 160         int ret;
 161
 162         ret = spidev_write(2, len, buf);
 163         if (ret < 0)
 164                 return ret;
 165
 166         DEBUGP("%s len=%u, data=%s\n", __FUNCTION__, len,
 167                rfid_hexdump(buf, len));
 168
 169         return len;
 170 }
 171
 172 struct rfid_asic_transport spidev_spi = {
 173         .name = "spidev",
 174         .priv.rc632 = {
 175                        .fn = {
 176                               .reg_write = &spidev_reg_write,
 177                               .reg_read = &spidev_reg_read,
 178                               .fifo_write = &spidev_fifo_write,
 179                               .fifo_read = &spidev_fifo_read,
 180                               },
 181                        },
 182 };
 183
 184 static int spidev_transceive(struct rfid_reader_handle *rh,
 185                                enum rfid_frametype frametype,
 186                                const unsigned char *tx_data,
 187                                unsigned int tx_len, unsigned char *rx_data,
 188                                unsigned int *rx_len, u_int64_t timeout,
 189                                unsigned int flags)
 190 {
 191         return rh->ah->asic->priv.rc632.fn.transceive(rh->ah, frametype,
 192                                                       tx_data, tx_len, rx_data,
 193                                                       rx_len, timeout, flags);
 194 }
 195
 196 static int spidev_transceive_sf(struct rfid_reader_handle *rh,
 197                                   unsigned char cmd,
 198                                   struct iso14443a_atqa *atqa)
 199 {
 200         return rh->ah->asic->priv.rc632.fn.iso14443a.transceive_sf(rh->ah, cmd,
 201                                                                    atqa);
 202 }
 203
 204 static int
 205 spidev_transceive_acf(struct rfid_reader_handle *rh,
 206                         struct iso14443a_anticol_cmd *cmd,
 207                         unsigned int *bit_of_col)
 208 {
 209         return rh->ah->asic->priv.rc632.fn.iso14443a.transceive_acf(rh->ah,
 210                                                                     cmd,
 211                                                                     bit_of_col);
 212 }
 213
 214 static int spidev_14443a_init(struct rfid_reader_handle *rh)
 215 {
 216         int ret;
 217         ret = rh->ah->asic->priv.rc632.fn.iso14443a.init(rh->ah);
 218         return ret;
 219 }
 220
 221 static int
 222 spidev_14443a_set_speed(struct rfid_reader_handle *rh,
 223                           unsigned int tx, unsigned int speed)
 224 {
 225         u_int8_t rate;
 226
 227         DEBUGP("setting rate: ");
 228         switch (speed) {
 229             case RFID_14443A_SPEED_106K:
 230                     rate = 0x00;
 231                     DEBUGPC("106K\n");
 232                     break;
 233             case RFID_14443A_SPEED_212K:
 234                     rate = 0x01;
 235                     DEBUGPC("212K\n");
 236                     break;
 237             case RFID_14443A_SPEED_424K:
 238                     rate = 0x02;
 239                     DEBUGPC("424K\n");
 240                     break;
 241             case RFID_14443A_SPEED_848K:
 242                     rate = 0x03;
 243                     DEBUGPC("848K\n");
 244                     break;
 245             default:
 246                     return -EINVAL;
 247                     break;
 248         }
 249         return rh->ah->asic->priv.rc632.fn.iso14443a.set_speed(rh->ah,
 250                                                                tx, rate);
 251 }
 252
 253 static int spidev_14443b_init(struct rfid_reader_handle *rh)
 254 {
 255         return rh->ah->asic->priv.rc632.fn.iso14443b.init(rh->ah);
 256 }
 257
 258 static int spidev_15693_init(struct rfid_reader_handle *rh)
 259 {
 260         return rh->ah->asic->priv.rc632.fn.iso15693.init(rh->ah);
 261 }
 262
 263 static int
 264 spidev_mifare_setkey(struct rfid_reader_handle *rh, const u_int8_t * key)
 265 {
 266         return rh->ah->asic->priv.rc632.fn.mifare_classic.setkey(rh->ah, key);
 267 }
 268
 269 static int
 270 spidev_mifare_auth(struct rfid_reader_handle *rh, u_int8_t cmd,
 271                      u_int32_t serno, u_int8_t block)
 272 {
 273         return rh->ah->asic->priv.rc632.fn.mifare_classic.auth(rh->ah,
 274                                                                cmd, serno,
 275                                                                block);
 276 }
 277
 278 static struct rfid_reader_handle *spidev_open(void *data)
 279 {
 280         struct rfid_reader_handle *rh;
 281         struct rfid_asic_transport_handle *rath;
 282         __u32 tmp;
 283
 284         /* open spi device */
 285         if (!data) {
 286                 DEBUGP("No device name\n");
 287                 return NULL;
 288         }
 289         if ((spidev_fd = open(data, O_RDWR)) < 0) {
 290                 DEBUGP("Unable to open:\n");
 291                 return NULL;
 292         }
 293
 294         rh = malloc(sizeof(*rh));
 295         if (!rh)
 296                 goto out_close_spi;
 297
 298         memset(rh, 0, sizeof(*rh));
 299
 300         rath = malloc(sizeof(*rath));
 301         if (!rath)
 302                 goto out_rh;
 303         memset(rath, 0, sizeof(*rath));
 304
 305         rath->rat = &spidev_spi;
 306         rh->reader = &rfid_reader_spidev;
 307
 308         /* Configure spi device, MODE 0 */
 309         tmp = SPI_MODE_0;
 310         if (ioctl(spidev_fd, SPI_IOC_WR_MODE, &tmp) < 0)
 311                 goto out_rath;
 312
 313         /* MSB First */
 314         tmp = 0;
 315         if (ioctl(spidev_fd, SPI_IOC_WR_LSB_FIRST, &tmp) < 0)
 316                 goto out_rath;
 317
 318         /* 8 bits per word */
 319         tmp = 8;
 320         if (ioctl(spidev_fd, SPI_IOC_WR_BITS_PER_WORD, &tmp) < 0)
 321                 goto out_rath;
 322
 323         /* 1 MHz */
 324         tmp = 1e6;
 325         if (ioctl(spidev_fd, SPI_IOC_WR_MAX_SPEED_HZ, &tmp) < 0)
 326                 goto out_rath;
 327
 328         /* turn on rc632 */
 329         rh->ah = rc632_open(rath);
 330         if (!rh->ah)
 331                 goto out_rath;
 332
 333         /* everything is ok, returning reader handler */
 334         return rh;
 335 out_rath:
 336         free(rath);
 337 out_rh:
 338         free(rh);
 339 out_close_spi:
 340         close(spidev_fd);
 341         return NULL;
 342 }
 343
 344 static void spidev_close(struct rfid_reader_handle *rh)
 345 {
 346         struct rfid_asic_transport_handle *rath = rh->ah->rath;
 347
 348         if (rh->ah)
 349                 rc632_close(rh->ah);
 350
 351         if (spidev_fd > 0)
 352                 close(spidev_fd);
 353
 354         if (rath)
 355                 free(rath);
 356
 357         if (rh)
 358                 free(rh);
 359 }
 360
 361 struct rfid_reader rfid_reader_spidev = {
 362         .name = "spidev reader",
 363         .id = RFID_READER_SPIDEV,
 364         .open = &spidev_open,
 365         .close = &spidev_close,
 366         .transceive = &spidev_transceive,
 367         .l2_supported = (1 << RFID_LAYER2_ISO14443A) |
 368                         (1 << RFID_LAYER2_ISO14443B) |
 369                         (1 << RFID_LAYER2_ISO15693),
 370         .proto_supported = (1 << RFID_PROTOCOL_TCL) |
 371                            (1 << RFID_PROTOCOL_MIFARE_UL) |
 372                            (1 << RFID_PROTOCOL_MIFARE_CLASSIC),
 373         .iso14443a = {
 374                       .init = &spidev_14443a_init,
 375                       .transceive_sf = &spidev_transceive_sf,
 376                       .transceive_acf = &spidev_transceive_acf,
 377                       .speed = RFID_14443A_SPEED_106K
 378                       | RFID_14443A_SPEED_212K | RFID_14443A_SPEED_424K,
 379                       .set_speed = &spidev_14443a_set_speed,
 380         },
 381         .iso14443b = {
 382                       .init = &spidev_14443b_init,
 383         },
 384         .mifare_classic = {
 385                 .setkey = &spidev_mifare_setkey,
 386                 .auth = &spidev_mifare_auth,
 387         },
 388 };
 389