drivers/net/ieee802154/cc2520.c

   1 /* Driver for TI CC2520 802.15.4 Wireless-PAN Networking controller
   2  *
   3  * Copyright (C) 2014 Varka Bhadram <varkab@cdac.in>
   4  *                    Md.Jamal Mohiuddin <mjmohiuddin@cdac.in>
   5  *                    P Sowjanya <sowjanyap@cdac.in>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  */
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/gpio.h>
  16 #include <linux/delay.h>
  17 #include <linux/spi/spi.h>
  18 #include <linux/spi/cc2520.h>
  19 #include <linux/workqueue.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/of_gpio.h>
  23 #include <linux/ieee802154.h>
  24 #include <linux/crc-ccitt.h>
  25 #include <asm/unaligned.h>
  26
  27 #include <net/mac802154.h>
  28 #include <net/cfg802154.h>
  29
  30 #define SPI_COMMAND_BUFFER      3
  31 #define HIGH                    1
  32 #define LOW                     0
  33 #define STATE_IDLE              0
  34 #define RSSI_VALID              0
  35 #define RSSI_OFFSET             78
  36
  37 #define CC2520_RAM_SIZE         640
  38 #define CC2520_FIFO_SIZE        128
  39
  40 #define CC2520RAM_TXFIFO        0x100
  41 #define CC2520RAM_RXFIFO        0x180
  42 #define CC2520RAM_IEEEADDR      0x3EA
  43 #define CC2520RAM_PANID         0x3F2
  44 #define CC2520RAM_SHORTADDR     0x3F4
  45
  46 #define CC2520_FREG_MASK        0x3F
  47
  48 /* status byte values */
  49 #define CC2520_STATUS_XOSC32M_STABLE    BIT(7)
  50 #define CC2520_STATUS_RSSI_VALID        BIT(6)
  51 #define CC2520_STATUS_TX_UNDERFLOW      BIT(3)
  52
  53 /* IEEE-802.15.4 defined constants (2.4 GHz logical channels) */
  54 #define CC2520_MINCHANNEL               11
  55 #define CC2520_MAXCHANNEL               26
  56 #define CC2520_CHANNEL_SPACING          5
  57
  58 /* command strobes */
  59 #define CC2520_CMD_SNOP                 0x00
  60 #define CC2520_CMD_IBUFLD               0x02
  61 #define CC2520_CMD_SIBUFEX              0x03
  62 #define CC2520_CMD_SSAMPLECCA           0x04
  63 #define CC2520_CMD_SRES                 0x0f
  64 #define CC2520_CMD_MEMORY_MASK          0x0f
  65 #define CC2520_CMD_MEMORY_READ          0x10
  66 #define CC2520_CMD_MEMORY_WRITE         0x20
  67 #define CC2520_CMD_RXBUF                0x30
  68 #define CC2520_CMD_RXBUFCP              0x38
  69 #define CC2520_CMD_RXBUFMOV             0x32
  70 #define CC2520_CMD_TXBUF                0x3A
  71 #define CC2520_CMD_TXBUFCP              0x3E
  72 #define CC2520_CMD_RANDOM               0x3C
  73 #define CC2520_CMD_SXOSCON              0x40
  74 #define CC2520_CMD_STXCAL               0x41
  75 #define CC2520_CMD_SRXON                0x42
  76 #define CC2520_CMD_STXON                0x43
  77 #define CC2520_CMD_STXONCCA             0x44
  78 #define CC2520_CMD_SRFOFF               0x45
  79 #define CC2520_CMD_SXOSCOFF             0x46
  80 #define CC2520_CMD_SFLUSHRX             0x47
  81 #define CC2520_CMD_SFLUSHTX             0x48
  82 #define CC2520_CMD_SACK                 0x49
  83 #define CC2520_CMD_SACKPEND             0x4A
  84 #define CC2520_CMD_SNACK                0x4B
  85 #define CC2520_CMD_SRXMASKBITSET        0x4C
  86 #define CC2520_CMD_SRXMASKBITCLR        0x4D
  87 #define CC2520_CMD_RXMASKAND            0x4E
  88 #define CC2520_CMD_RXMASKOR             0x4F
  89 #define CC2520_CMD_MEMCP                0x50
  90 #define CC2520_CMD_MEMCPR               0x52
  91 #define CC2520_CMD_MEMXCP               0x54
  92 #define CC2520_CMD_MEMXWR               0x56
  93 #define CC2520_CMD_BCLR                 0x58
  94 #define CC2520_CMD_BSET                 0x59
  95 #define CC2520_CMD_CTR_UCTR             0x60
  96 #define CC2520_CMD_CBCMAC               0x64
  97 #define CC2520_CMD_UCBCMAC              0x66
  98 #define CC2520_CMD_CCM                  0x68
  99 #define CC2520_CMD_UCCM                 0x6A
 100 #define CC2520_CMD_ECB                  0x70
 101 #define CC2520_CMD_ECBO                 0x72
 102 #define CC2520_CMD_ECBX                 0x74
 103 #define CC2520_CMD_INC                  0x78
 104 #define CC2520_CMD_ABORT                0x7F
 105 #define CC2520_CMD_REGISTER_READ        0x80
 106 #define CC2520_CMD_REGISTER_WRITE       0xC0
 107
 108 /* status registers */
 109 #define CC2520_CHIPID                   0x40
 110 #define CC2520_VERSION                  0x42
 111 #define CC2520_EXTCLOCK                 0x44
 112 #define CC2520_MDMCTRL0                 0x46
 113 #define CC2520_MDMCTRL1                 0x47
 114 #define CC2520_FREQEST                  0x48
 115 #define CC2520_RXCTRL                   0x4A
 116 #define CC2520_FSCTRL                   0x4C
 117 #define CC2520_FSCAL0                   0x4E
 118 #define CC2520_FSCAL1                   0x4F
 119 #define CC2520_FSCAL2                   0x50
 120 #define CC2520_FSCAL3                   0x51
 121 #define CC2520_AGCCTRL0                 0x52
 122 #define CC2520_AGCCTRL1                 0x53
 123 #define CC2520_AGCCTRL2                 0x54
 124 #define CC2520_AGCCTRL3                 0x55
 125 #define CC2520_ADCTEST0                 0x56
 126 #define CC2520_ADCTEST1                 0x57
 127 #define CC2520_ADCTEST2                 0x58
 128 #define CC2520_MDMTEST0                 0x5A
 129 #define CC2520_MDMTEST1                 0x5B
 130 #define CC2520_DACTEST0                 0x5C
 131 #define CC2520_DACTEST1                 0x5D
 132 #define CC2520_ATEST                    0x5E
 133 #define CC2520_DACTEST2                 0x5F
 134 #define CC2520_PTEST0                   0x60
 135 #define CC2520_PTEST1                   0x61
 136 #define CC2520_RESERVED                 0x62
 137 #define CC2520_DPUBIST                  0x7A
 138 #define CC2520_ACTBIST                  0x7C
 139 #define CC2520_RAMBIST                  0x7E
 140
 141 /* frame registers */
 142 #define CC2520_FRMFILT0                 0x00
 143 #define CC2520_FRMFILT1                 0x01
 144 #define CC2520_SRCMATCH                 0x02
 145 #define CC2520_SRCSHORTEN0              0x04
 146 #define CC2520_SRCSHORTEN1              0x05
 147 #define CC2520_SRCSHORTEN2              0x06
 148 #define CC2520_SRCEXTEN0                0x08
 149 #define CC2520_SRCEXTEN1                0x09
 150 #define CC2520_SRCEXTEN2                0x0A
 151 #define CC2520_FRMCTRL0                 0x0C
 152 #define CC2520_FRMCTRL1                 0x0D
 153 #define CC2520_RXENABLE0                0x0E
 154 #define CC2520_RXENABLE1                0x0F
 155 #define CC2520_EXCFLAG0                 0x10
 156 #define CC2520_EXCFLAG1                 0x11
 157 #define CC2520_EXCFLAG2                 0x12
 158 #define CC2520_EXCMASKA0                0x14
 159 #define CC2520_EXCMASKA1                0x15
 160 #define CC2520_EXCMASKA2                0x16
 161 #define CC2520_EXCMASKB0                0x18
 162 #define CC2520_EXCMASKB1                0x19
 163 #define CC2520_EXCMASKB2                0x1A
 164 #define CC2520_EXCBINDX0                0x1C
 165 #define CC2520_EXCBINDX1                0x1D
 166 #define CC2520_EXCBINDY0                0x1E
 167 #define CC2520_EXCBINDY1                0x1F
 168 #define CC2520_GPIOCTRL0                0x20
 169 #define CC2520_GPIOCTRL1                0x21
 170 #define CC2520_GPIOCTRL2                0x22
 171 #define CC2520_GPIOCTRL3                0x23
 172 #define CC2520_GPIOCTRL4                0x24
 173 #define CC2520_GPIOCTRL5                0x25
 174 #define CC2520_GPIOPOLARITY             0x26
 175 #define CC2520_GPIOCTRL                 0x28
 176 #define CC2520_DPUCON                   0x2A
 177 #define CC2520_DPUSTAT                  0x2C
 178 #define CC2520_FREQCTRL                 0x2E
 179 #define CC2520_FREQTUNE                 0x2F
 180 #define CC2520_TXPOWER                  0x30
 181 #define CC2520_TXCTRL                   0x31
 182 #define CC2520_FSMSTAT0                 0x32
 183 #define CC2520_FSMSTAT1                 0x33
 184 #define CC2520_FIFOPCTRL                0x34
 185 #define CC2520_FSMCTRL                  0x35
 186 #define CC2520_CCACTRL0                 0x36
 187 #define CC2520_CCACTRL1                 0x37
 188 #define CC2520_RSSI                     0x38
 189 #define CC2520_RSSISTAT                 0x39
 190 #define CC2520_RXFIRST                  0x3C
 191 #define CC2520_RXFIFOCNT                0x3E
 192 #define CC2520_TXFIFOCNT                0x3F
 193
 194 /* CC2520_FRMFILT0 */
 195 #define FRMFILT0_FRAME_FILTER_EN        BIT(0)
 196 #define FRMFILT0_PAN_COORDINATOR        BIT(1)
 197
 198 /* CC2520_FRMCTRL0 */
 199 #define FRMCTRL0_AUTOACK                BIT(5)
 200 #define FRMCTRL0_AUTOCRC                BIT(6)
 201
 202 /* CC2520_FRMCTRL1 */
 203 #define FRMCTRL1_SET_RXENMASK_ON_TX     BIT(0)
 204 #define FRMCTRL1_IGNORE_TX_UNDERF       BIT(1)
 205
 206 /* Driver private information */
 207 struct cc2520_private {
 208         struct spi_device *spi;         /* SPI device structure */
 209         struct ieee802154_hw *hw;       /* IEEE-802.15.4 device */
 210         u8 *buf;                        /* SPI TX/Rx data buffer */
 211         struct mutex buffer_mutex;      /* SPI buffer mutex */
 212         bool is_tx;                     /* Flag for sync b/w Tx and Rx */
 213         bool amplified;                 /* Flag for CC2591 */
 214         int fifo_pin;                   /* FIFO GPIO pin number */
 215         struct work_struct fifop_irqwork;/* Workqueue for FIFOP */
 216         spinlock_t lock;                /* Lock for is_tx*/
 217         struct completion tx_complete;  /* Work completion for Tx */
 218         bool promiscuous;               /* Flag for promiscuous mode */
 219 };
 220
 221 /* Generic Functions */
 222 static int
 223 cc2520_cmd_strobe(struct cc2520_private *priv, u8 cmd)
 224 {
 225         int ret;
 226         u8 status = 0xff;
 227         struct spi_message msg;
 228         struct spi_transfer xfer = {
 229                 .len = 0,
 230                 .tx_buf = priv->buf,
 231                 .rx_buf = priv->buf,
 232         };
 233
 234         spi_message_init(&msg);
 235         spi_message_add_tail(&xfer, &msg);
 236
 237         mutex_lock(&priv->buffer_mutex);
 238         priv->buf[xfer.len++] = cmd;
 239         dev_vdbg(&priv->spi->dev,
 240                  "command strobe buf[0] = %02x\n",
 241                  priv->buf[0]);
 242
 243         ret = spi_sync(priv->spi, &msg);
 244         if (!ret)
 245                 status = priv->buf[0];
 246         dev_vdbg(&priv->spi->dev,
 247                  "buf[0] = %02x\n", priv->buf[0]);
 248         mutex_unlock(&priv->buffer_mutex);
 249
 250         return ret;
 251 }
 252
 253 static int
 254 cc2520_get_status(struct cc2520_private *priv, u8 *status)
 255 {
 256         int ret;
 257         struct spi_message msg;
 258         struct spi_transfer xfer = {
 259                 .len = 0,
 260                 .tx_buf = priv->buf,
 261                 .rx_buf = priv->buf,
 262         };
 263
 264         spi_message_init(&msg);
 265         spi_message_add_tail(&xfer, &msg);
 266
 267         mutex_lock(&priv->buffer_mutex);
 268         priv->buf[xfer.len++] = CC2520_CMD_SNOP;
 269         dev_vdbg(&priv->spi->dev,
 270                  "get status command buf[0] = %02x\n", priv->buf[0]);
 271
 272         ret = spi_sync(priv->spi, &msg);
 273         if (!ret)
 274                 *status = priv->buf[0];
 275         dev_vdbg(&priv->spi->dev,
 276                  "buf[0] = %02x\n", priv->buf[0]);
 277         mutex_unlock(&priv->buffer_mutex);
 278
 279         return ret;
 280 }
 281
 282 static int
 283 cc2520_write_register(struct cc2520_private *priv, u8 reg, u8 value)
 284 {
 285         int status;
 286         struct spi_message msg;
 287         struct spi_transfer xfer = {
 288                 .len = 0,
 289                 .tx_buf = priv->buf,
 290                 .rx_buf = priv->buf,
 291         };
 292
 293         spi_message_init(&msg);
 294         spi_message_add_tail(&xfer, &msg);
 295
 296         mutex_lock(&priv->buffer_mutex);
 297
 298         if (reg <= CC2520_FREG_MASK) {
 299                 priv->buf[xfer.len++] = CC2520_CMD_REGISTER_WRITE | reg;
 300                 priv->buf[xfer.len++] = value;
 301         } else {
 302                 priv->buf[xfer.len++] = CC2520_CMD_MEMORY_WRITE;
 303                 priv->buf[xfer.len++] = reg;
 304                 priv->buf[xfer.len++] = value;
 305         }
 306         status = spi_sync(priv->spi, &msg);
 307         if (msg.status)
 308                 status = msg.status;
 309
 310         mutex_unlock(&priv->buffer_mutex);
 311
 312         return status;
 313 }
 314
 315 static int
 316 cc2520_write_ram(struct cc2520_private *priv, u16 reg, u8 len, u8 *data)
 317 {
 318         int status;
 319         struct spi_message msg;
 320         struct spi_transfer xfer_head = {
 321                 .len        = 0,
 322                 .tx_buf        = priv->buf,
 323                 .rx_buf        = priv->buf,
 324         };
 325
 326         struct spi_transfer xfer_buf = {
 327                 .len = len,
 328                 .tx_buf = data,
 329         };
 330
 331         mutex_lock(&priv->buffer_mutex);
 332         priv->buf[xfer_head.len++] = (CC2520_CMD_MEMORY_WRITE |
 333                                                 ((reg >> 8) & 0xff));
 334         priv->buf[xfer_head.len++] = reg & 0xff;
 335
 336         spi_message_init(&msg);
 337         spi_message_add_tail(&xfer_head, &msg);
 338         spi_message_add_tail(&xfer_buf, &msg);
 339
 340         status = spi_sync(priv->spi, &msg);
 341         dev_dbg(&priv->spi->dev, "spi status = %d\n", status);
 342         if (msg.status)
 343                 status = msg.status;
 344
 345         mutex_unlock(&priv->buffer_mutex);
 346         return status;
 347 }
 348
 349 static int
 350 cc2520_read_register(struct cc2520_private *priv, u8 reg, u8 *data)
 351 {
 352         int status;
 353         struct spi_message msg;
 354         struct spi_transfer xfer1 = {
 355                 .len = 0,
 356                 .tx_buf = priv->buf,
 357                 .rx_buf = priv->buf,
 358         };
 359
 360         struct spi_transfer xfer2 = {
 361                 .len = 1,
 362                 .rx_buf = data,
 363         };
 364
 365         spi_message_init(&msg);
 366         spi_message_add_tail(&xfer1, &msg);
 367         spi_message_add_tail(&xfer2, &msg);
 368
 369         mutex_lock(&priv->buffer_mutex);
 370         priv->buf[xfer1.len++] = CC2520_CMD_MEMORY_READ;
 371         priv->buf[xfer1.len++] = reg;
 372
 373         status = spi_sync(priv->spi, &msg);
 374         dev_dbg(&priv->spi->dev,
 375                 "spi status = %d\n", status);
 376         if (msg.status)
 377                 status = msg.status;
 378
 379         mutex_unlock(&priv->buffer_mutex);
 380
 381         return status;
 382 }
 383
 384 static int
 385 cc2520_write_txfifo(struct cc2520_private *priv, u8 pkt_len, u8 *data, u8 len)
 386 {
 387         int status;
 388
 389         /* length byte must include FCS even
 390          * if it is calculated in the hardware
 391          */
 392         int len_byte = pkt_len;
 393
 394         struct spi_message msg;
 395
 396         struct spi_transfer xfer_head = {
 397                 .len = 0,
 398                 .tx_buf = priv->buf,
 399                 .rx_buf = priv->buf,
 400         };
 401         struct spi_transfer xfer_len = {
 402                 .len = 1,
 403                 .tx_buf = &len_byte,
 404         };
 405         struct spi_transfer xfer_buf = {
 406                 .len = len,
 407                 .tx_buf = data,
 408         };
 409
 410         spi_message_init(&msg);
 411         spi_message_add_tail(&xfer_head, &msg);
 412         spi_message_add_tail(&xfer_len, &msg);
 413         spi_message_add_tail(&xfer_buf, &msg);
 414
 415         mutex_lock(&priv->buffer_mutex);
 416         priv->buf[xfer_head.len++] = CC2520_CMD_TXBUF;
 417         dev_vdbg(&priv->spi->dev,
 418                  "TX_FIFO cmd buf[0] = %02x\n", priv->buf[0]);
 419
 420         status = spi_sync(priv->spi, &msg);
 421         dev_vdbg(&priv->spi->dev, "status = %d\n", status);
 422         if (msg.status)
 423                 status = msg.status;
 424         dev_vdbg(&priv->spi->dev, "status = %d\n", status);
 425         dev_vdbg(&priv->spi->dev, "buf[0] = %02x\n", priv->buf[0]);
 426         mutex_unlock(&priv->buffer_mutex);
 427
 428         return status;
 429 }
 430
 431 static int
 432 cc2520_read_rxfifo(struct cc2520_private *priv, u8 *data, u8 len)
 433 {
 434         int status;
 435         struct spi_message msg;
 436
 437         struct spi_transfer xfer_head = {
 438                 .len = 0,
 439                 .tx_buf = priv->buf,
 440                 .rx_buf = priv->buf,
 441         };
 442         struct spi_transfer xfer_buf = {
 443                 .len = len,
 444                 .rx_buf = data,
 445         };
 446
 447         spi_message_init(&msg);
 448         spi_message_add_tail(&xfer_head, &msg);
 449         spi_message_add_tail(&xfer_buf, &msg);
 450
 451         mutex_lock(&priv->buffer_mutex);
 452         priv->buf[xfer_head.len++] = CC2520_CMD_RXBUF;
 453
 454         dev_vdbg(&priv->spi->dev, "read rxfifo buf[0] = %02x\n", priv->buf[0]);
 455         dev_vdbg(&priv->spi->dev, "buf[1] = %02x\n", priv->buf[1]);
 456
 457         status = spi_sync(priv->spi, &msg);
 458         dev_vdbg(&priv->spi->dev, "status = %d\n", status);
 459         if (msg.status)
 460                 status = msg.status;
 461         dev_vdbg(&priv->spi->dev, "status = %d\n", status);
 462         dev_vdbg(&priv->spi->dev,
 463                  "return status buf[0] = %02x\n", priv->buf[0]);
 464         dev_vdbg(&priv->spi->dev, "length buf[1] = %02x\n", priv->buf[1]);
 465
 466         mutex_unlock(&priv->buffer_mutex);
 467
 468         return status;
 469 }
 470
 471 static int cc2520_start(struct ieee802154_hw *hw)
 472 {
 473         return cc2520_cmd_strobe(hw->priv, CC2520_CMD_SRXON);
 474 }
 475
 476 static void cc2520_stop(struct ieee802154_hw *hw)
 477 {
 478         cc2520_cmd_strobe(hw->priv, CC2520_CMD_SRFOFF);
 479 }
 480
 481 static int
 482 cc2520_tx(struct ieee802154_hw *hw, struct sk_buff *skb)
 483 {
 484         struct cc2520_private *priv = hw->priv;
 485         unsigned long flags;
 486         int rc;
 487         u8 status = 0;
 488         u8 pkt_len;
 489
 490         /* In promiscuous mode we disable AUTOCRC so we can get the raw CRC
 491          * values on RX. This means we need to manually add the CRC on TX.
 492          */
 493         if (priv->promiscuous) {
 494                 u16 crc = crc_ccitt(0, skb->data, skb->len);
 495
 496                 put_unaligned_le16(crc, skb_put(skb, 2));
 497                 pkt_len = skb->len;
 498         } else {
 499                 pkt_len = skb->len + 2;
 500         }
 501
 502         rc = cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHTX);
 503         if (rc)
 504                 goto err_tx;
 505
 506         rc = cc2520_write_txfifo(priv, pkt_len, skb->data, skb->len);
 507         if (rc)
 508                 goto err_tx;
 509
 510         rc = cc2520_get_status(priv, &status);
 511         if (rc)
 512                 goto err_tx;
 513
 514         if (status & CC2520_STATUS_TX_UNDERFLOW) {
 515                 rc = -EINVAL;
 516                 dev_err(&priv->spi->dev, "cc2520 tx underflow exception\n");
 517                 goto err_tx;
 518         }
 519
 520         spin_lock_irqsave(&priv->lock, flags);
 521         WARN_ON(priv->is_tx);
 522         priv->is_tx = 1;
 523         spin_unlock_irqrestore(&priv->lock, flags);
 524
 525         rc = cc2520_cmd_strobe(priv, CC2520_CMD_STXONCCA);
 526         if (rc)
 527                 goto err;
 528
 529         rc = wait_for_completion_interruptible(&priv->tx_complete);
 530         if (rc < 0)
 531                 goto err;
 532
 533         cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHTX);
 534         cc2520_cmd_strobe(priv, CC2520_CMD_SRXON);
 535
 536         return rc;
 537 err:
 538         spin_lock_irqsave(&priv->lock, flags);
 539         priv->is_tx = 0;
 540         spin_unlock_irqrestore(&priv->lock, flags);
 541 err_tx:
 542         return rc;
 543 }
 544
 545 static int cc2520_rx(struct cc2520_private *priv)
 546 {
 547         u8 len = 0, lqi = 0, bytes = 1;
 548         struct sk_buff *skb;
 549
 550         /* Read single length byte from the radio. */
 551         cc2520_read_rxfifo(priv, &len, bytes);
 552
 553         if (!ieee802154_is_valid_psdu_len(len)) {
 554                 /* Corrupted frame received, clear frame buffer by
 555                  * reading entire buffer.
 556                  */
 557                 dev_dbg(&priv->spi->dev, "corrupted frame received\n");
 558                 len = IEEE802154_MTU;
 559         }
 560
 561         skb = dev_alloc_skb(len);
 562         if (!skb)
 563                 return -ENOMEM;
 564
 565         if (cc2520_read_rxfifo(priv, skb_put(skb, len), len)) {
 566                 dev_dbg(&priv->spi->dev, "frame reception failed\n");
 567                 kfree_skb(skb);
 568                 return -EINVAL;
 569         }
 570
 571         /* In promiscuous mode, we configure the radio to include the
 572          * CRC (AUTOCRC==0) and we pass on the packet unconditionally. If not
 573          * in promiscuous mode, we check the CRC here, but leave the
 574          * RSSI/LQI/CRC_OK bytes as they will get removed in the mac layer.
 575          */
 576         if (!priv->promiscuous) {
 577                 bool crc_ok;
 578
 579                 /* Check if the CRC is valid. With AUTOCRC set, the most
 580                  * significant bit of the last byte returned from the CC2520
 581                  * is CRC_OK flag. See section 20.3.4 of the datasheet.
 582                  */
 583                 crc_ok = skb->data[len - 1] & BIT(7);
 584
 585                 /* If we failed CRC drop the packet in the driver layer. */
 586                 if (!crc_ok) {
 587                         dev_dbg(&priv->spi->dev, "CRC check failed\n");
 588                         kfree_skb(skb);
 589                         return -EINVAL;
 590                 }
 591
 592                 /* To calculate LQI, the lower 7 bits of the last byte (the
 593                  * correlation value provided by the radio) must be scaled to
 594                  * the range 0-255. According to section 20.6, the correlation
 595                  * value ranges from 50-110. Ideally this would be calibrated
 596                  * per hardware design, but we use roughly the datasheet values
 597                  * to get close enough while avoiding floating point.
 598                  */
 599                 lqi = skb->data[len - 1] & 0x7f;
 600                 if (lqi < 50)
 601                         lqi = 50;
 602                 else if (lqi > 113)
 603                         lqi = 113;
 604                 lqi = (lqi - 50) * 4;
 605         }
 606
 607         ieee802154_rx_irqsafe(priv->hw, skb, lqi);
 608
 609         dev_vdbg(&priv->spi->dev, "RXFIFO: %x %x\n", len, lqi);
 610
 611         return 0;
 612 }
 613
 614 static int
 615 cc2520_ed(struct ieee802154_hw *hw, u8 *level)
 616 {
 617         struct cc2520_private *priv = hw->priv;
 618         u8 status = 0xff;
 619         u8 rssi;
 620         int ret;
 621
 622         ret = cc2520_read_register(priv, CC2520_RSSISTAT, &status);
 623         if (ret)
 624                 return ret;
 625
 626         if (status != RSSI_VALID)
 627                 return -EINVAL;
 628
 629         ret = cc2520_read_register(priv, CC2520_RSSI, &rssi);
 630         if (ret)
 631                 return ret;
 632
 633         /* level = RSSI(rssi) - OFFSET [dBm] : offset is 76dBm */
 634         *level = rssi - RSSI_OFFSET;
 635
 636         return 0;
 637 }
 638
 639 static int
 640 cc2520_set_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
 641 {
 642         struct cc2520_private *priv = hw->priv;
 643         int ret;
 644
 645         dev_dbg(&priv->spi->dev, "trying to set channel\n");
 646
 647         WARN_ON(page != 0);
 648         WARN_ON(channel < CC2520_MINCHANNEL);
 649         WARN_ON(channel > CC2520_MAXCHANNEL);
 650
 651         ret = cc2520_write_register(priv, CC2520_FREQCTRL,
 652                                     11 + 5 * (channel - 11));
 653
 654         return ret;
 655 }
 656
 657 static int
 658 cc2520_filter(struct ieee802154_hw *hw,
 659               struct ieee802154_hw_addr_filt *filt, unsigned long changed)
 660 {
 661         struct cc2520_private *priv = hw->priv;
 662         int ret = 0;
 663
 664         if (changed & IEEE802154_AFILT_PANID_CHANGED) {
 665                 u16 panid = le16_to_cpu(filt->pan_id);
 666
 667                 dev_vdbg(&priv->spi->dev, "%s called for pan id\n", __func__);
 668                 ret = cc2520_write_ram(priv, CC2520RAM_PANID,
 669                                        sizeof(panid), (u8 *)&panid);
 670         }
 671
 672         if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
 673                 dev_vdbg(&priv->spi->dev,
 674                          "%s called for IEEE addr\n", __func__);
 675                 ret = cc2520_write_ram(priv, CC2520RAM_IEEEADDR,
 676                                        sizeof(filt->ieee_addr),
 677                                        (u8 *)&filt->ieee_addr);
 678         }
 679
 680         if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
 681                 u16 addr = le16_to_cpu(filt->short_addr);
 682
 683                 dev_vdbg(&priv->spi->dev, "%s called for saddr\n", __func__);
 684                 ret = cc2520_write_ram(priv, CC2520RAM_SHORTADDR,
 685                                        sizeof(addr), (u8 *)&addr);
 686         }
 687
 688         if (changed & IEEE802154_AFILT_PANC_CHANGED) {
 689                 u8 frmfilt0;
 690
 691                 dev_vdbg(&priv->spi->dev,
 692                          "%s called for panc change\n", __func__);
 693
 694                 cc2520_read_register(priv, CC2520_FRMFILT0, &frmfilt0);
 695
 696                 if (filt->pan_coord)
 697                         frmfilt0 |= FRMFILT0_PAN_COORDINATOR;
 698                 else
 699                         frmfilt0 &= ~FRMFILT0_PAN_COORDINATOR;
 700
 701                 ret = cc2520_write_register(priv, CC2520_FRMFILT0, frmfilt0);
 702         }
 703
 704         return ret;
 705 }
 706
 707 static inline int cc2520_set_tx_power(struct cc2520_private *priv, s32 mbm)
 708 {
 709         u8 power;
 710
 711         switch (mbm) {
 712         case 500:
 713                 power = 0xF7;
 714                 break;
 715         case 300:
 716                 power = 0xF2;
 717                 break;
 718         case 200:
 719                 power = 0xAB;
 720                 break;
 721         case 100:
 722                 power = 0x13;
 723                 break;
 724         case 0:
 725                 power = 0x32;
 726                 break;
 727         case -200:
 728                 power = 0x81;
 729                 break;
 730         case -400:
 731                 power = 0x88;
 732                 break;
 733         case -700:
 734                 power = 0x2C;
 735                 break;
 736         case -1800:
 737                 power = 0x03;
 738                 break;
 739         default:
 740                 return -EINVAL;
 741         }
 742
 743         return cc2520_write_register(priv, CC2520_TXPOWER, power);
 744 }
 745
 746 static inline int cc2520_cc2591_set_tx_power(struct cc2520_private *priv,
 747                                              s32 mbm)
 748 {
 749         u8 power;
 750
 751         switch (mbm) {
 752         case 1700:
 753                 power = 0xF9;
 754                 break;
 755         case 1600:
 756                 power = 0xF0;
 757                 break;
 758         case 1400:
 759                 power = 0xA0;
 760                 break;
 761         case 1100:
 762                 power = 0x2C;
 763                 break;
 764         case -100:
 765                 power = 0x03;
 766                 break;
 767         case -800:
 768                 power = 0x01;
 769                 break;
 770         default:
 771                 return -EINVAL;
 772         }
 773
 774         return cc2520_write_register(priv, CC2520_TXPOWER, power);
 775 }
 776
 777 #define CC2520_MAX_TX_POWERS 0x8
 778 static const s32 cc2520_powers[CC2520_MAX_TX_POWERS + 1] = {
 779         500, 300, 200, 100, 0, -200, -400, -700, -1800,
 780 };
 781
 782 #define CC2520_CC2591_MAX_TX_POWERS 0x5
 783 static const s32 cc2520_cc2591_powers[CC2520_CC2591_MAX_TX_POWERS + 1] = {
 784         1700, 1600, 1400, 1100, -100, -800,
 785 };
 786
 787 static int
 788 cc2520_set_txpower(struct ieee802154_hw *hw, s32 mbm)
 789 {
 790         struct cc2520_private *priv = hw->priv;
 791
 792         if (!priv->amplified)
 793                 return cc2520_set_tx_power(priv, mbm);
 794
 795         return cc2520_cc2591_set_tx_power(priv, mbm);
 796 }
 797
 798 static int
 799 cc2520_set_promiscuous_mode(struct ieee802154_hw *hw, bool on)
 800 {
 801         struct cc2520_private *priv = hw->priv;
 802         u8 frmfilt0;
 803
 804         dev_dbg(&priv->spi->dev, "%s : mode %d\n", __func__, on);
 805
 806         priv->promiscuous = on;
 807
 808         cc2520_read_register(priv, CC2520_FRMFILT0, &frmfilt0);
 809
 810         if (on) {
 811                 /* Disable automatic ACK, automatic CRC, and frame filtering. */
 812                 cc2520_write_register(priv, CC2520_FRMCTRL0, 0);
 813                 frmfilt0 &= ~FRMFILT0_FRAME_FILTER_EN;
 814         } else {
 815                 cc2520_write_register(priv, CC2520_FRMCTRL0, FRMCTRL0_AUTOACK |
 816                                                              FRMCTRL0_AUTOCRC);
 817                 frmfilt0 |= FRMFILT0_FRAME_FILTER_EN;
 818         }
 819         return cc2520_write_register(priv, CC2520_FRMFILT0, frmfilt0);
 820 }
 821
 822 static const struct ieee802154_ops cc2520_ops = {
 823         .owner = THIS_MODULE,
 824         .start = cc2520_start,
 825         .stop = cc2520_stop,
 826         .xmit_sync = cc2520_tx,
 827         .ed = cc2520_ed,
 828         .set_channel = cc2520_set_channel,
 829         .set_hw_addr_filt = cc2520_filter,
 830         .set_txpower = cc2520_set_txpower,
 831         .set_promiscuous_mode = cc2520_set_promiscuous_mode,
 832 };
 833
 834 static int cc2520_register(struct cc2520_private *priv)
 835 {
 836         int ret = -ENOMEM;
 837
 838         priv->hw = ieee802154_alloc_hw(sizeof(*priv), &cc2520_ops);
 839         if (!priv->hw)
 840                 goto err_ret;
 841
 842         priv->hw->priv = priv;
 843         priv->hw->parent = &priv->spi->dev;
 844         priv->hw->extra_tx_headroom = 0;
 845         ieee802154_random_extended_addr(&priv->hw->phy->perm_extended_addr);
 846
 847         /* We do support only 2.4 Ghz */
 848         priv->hw->phy->supported.channels[0] = 0x7FFF800;
 849         priv->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
 850                           IEEE802154_HW_PROMISCUOUS;
 851
 852         priv->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER;
 853
 854         if (!priv->amplified) {
 855                 priv->hw->phy->supported.tx_powers = cc2520_powers;
 856                 priv->hw->phy->supported.tx_powers_size = ARRAY_SIZE(cc2520_powers);
 857                 priv->hw->phy->transmit_power = priv->hw->phy->supported.tx_powers[4];
 858         } else {
 859                 priv->hw->phy->supported.tx_powers = cc2520_cc2591_powers;
 860                 priv->hw->phy->supported.tx_powers_size = ARRAY_SIZE(cc2520_cc2591_powers);
 861                 priv->hw->phy->transmit_power = priv->hw->phy->supported.tx_powers[0];
 862         }
 863
 864         priv->hw->phy->current_channel = 11;
 865
 866         dev_vdbg(&priv->spi->dev, "registered cc2520\n");
 867         ret = ieee802154_register_hw(priv->hw);
 868         if (ret)
 869                 goto err_free_device;
 870
 871         return 0;
 872
 873 err_free_device:
 874         ieee802154_free_hw(priv->hw);
 875 err_ret:
 876         return ret;
 877 }
 878
 879 static void cc2520_fifop_irqwork(struct work_struct *work)
 880 {
 881         struct cc2520_private *priv
 882                 = container_of(work, struct cc2520_private, fifop_irqwork);
 883
 884         dev_dbg(&priv->spi->dev, "fifop interrupt received\n");
 885
 886         if (gpio_get_value(priv->fifo_pin))
 887                 cc2520_rx(priv);
 888         else
 889                 dev_dbg(&priv->spi->dev, "rxfifo overflow\n");
 890
 891         cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHRX);
 892         cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHRX);
 893 }
 894
 895 static irqreturn_t cc2520_fifop_isr(int irq, void *data)
 896 {
 897         struct cc2520_private *priv = data;
 898
 899         schedule_work(&priv->fifop_irqwork);
 900
 901         return IRQ_HANDLED;
 902 }
 903
 904 static irqreturn_t cc2520_sfd_isr(int irq, void *data)
 905 {
 906         struct cc2520_private *priv = data;
 907         unsigned long flags;
 908
 909         spin_lock_irqsave(&priv->lock, flags);
 910         if (priv->is_tx) {
 911                 priv->is_tx = 0;
 912                 spin_unlock_irqrestore(&priv->lock, flags);
 913                 dev_dbg(&priv->spi->dev, "SFD for TX\n");
 914                 complete(&priv->tx_complete);
 915         } else {
 916                 spin_unlock_irqrestore(&priv->lock, flags);
 917                 dev_dbg(&priv->spi->dev, "SFD for RX\n");
 918         }
 919
 920         return IRQ_HANDLED;
 921 }
 922
 923 static int cc2520_get_platform_data(struct spi_device *spi,
 924                                     struct cc2520_platform_data *pdata)
 925 {
 926         struct device_node *np = spi->dev.of_node;
 927         struct cc2520_private *priv = spi_get_drvdata(spi);
 928
 929         if (!np) {
 930                 struct cc2520_platform_data *spi_pdata = spi->dev.platform_data;
 931
 932                 if (!spi_pdata)
 933                         return -ENOENT;
 934                 *pdata = *spi_pdata;
 935                 priv->fifo_pin = pdata->fifo;
 936                 return 0;
 937         }
 938
 939         pdata->fifo = of_get_named_gpio(np, "fifo-gpio", 0);
 940         priv->fifo_pin = pdata->fifo;
 941
 942         pdata->fifop = of_get_named_gpio(np, "fifop-gpio", 0);
 943
 944         pdata->sfd = of_get_named_gpio(np, "sfd-gpio", 0);
 945         pdata->cca = of_get_named_gpio(np, "cca-gpio", 0);
 946         pdata->vreg = of_get_named_gpio(np, "vreg-gpio", 0);
 947         pdata->reset = of_get_named_gpio(np, "reset-gpio", 0);
 948
 949         /* CC2591 front end for CC2520 */
 950         if (of_property_read_bool(np, "amplified"))
 951                 priv->amplified = true;
 952
 953         return 0;
 954 }
 955
 956 static int cc2520_hw_init(struct cc2520_private *priv)
 957 {
 958         u8 status = 0, state = 0xff;
 959         int ret;
 960         int timeout = 100;
 961         struct cc2520_platform_data pdata;
 962
 963         ret = cc2520_get_platform_data(priv->spi, &pdata);
 964         if (ret)
 965                 goto err_ret;
 966
 967         ret = cc2520_read_register(priv, CC2520_FSMSTAT1, &state);
 968         if (ret)
 969                 goto err_ret;
 970
 971         if (state != STATE_IDLE)
 972                 return -EINVAL;
 973
 974         do {
 975                 ret = cc2520_get_status(priv, &status);
 976                 if (ret)
 977                         goto err_ret;
 978
 979                 if (timeout-- <= 0) {
 980                         dev_err(&priv->spi->dev, "oscillator start failed!\n");
 981                         return ret;
 982                 }
 983                 udelay(1);
 984         } while (!(status & CC2520_STATUS_XOSC32M_STABLE));
 985
 986         dev_vdbg(&priv->spi->dev, "oscillator brought up\n");
 987
 988         /* If the CC2520 is connected to a CC2591 amplifier, we must both
 989          * configure GPIOs on the CC2520 to correctly configure the CC2591
 990          * and change a couple settings of the CC2520 to work with the
 991          * amplifier. See section 8 page 17 of TI application note AN065.
 992          * http://www.ti.com/lit/an/swra229a/swra229a.pdf
 993          */
 994         if (priv->amplified) {
 995                 ret = cc2520_write_register(priv, CC2520_AGCCTRL1, 0x16);
 996                 if (ret)
 997                         goto err_ret;
 998
 999                 ret = cc2520_write_register(priv, CC2520_GPIOCTRL0, 0x46);
1000                 if (ret)
1001                         goto err_ret;
1002
1003                 ret = cc2520_write_register(priv, CC2520_GPIOCTRL5, 0x47);
1004                 if (ret)
1005                         goto err_ret;
1006
1007                 ret = cc2520_write_register(priv, CC2520_GPIOPOLARITY, 0x1e);
1008                 if (ret)
1009                         goto err_ret;
1010
1011                 ret = cc2520_write_register(priv, CC2520_TXCTRL, 0xc1);
1012                 if (ret)
1013                         goto err_ret;
1014         } else {
1015                 ret = cc2520_write_register(priv, CC2520_AGCCTRL1, 0x11);
1016                 if (ret)
1017                         goto err_ret;
1018         }
1019
1020         /* Registers default value: section 28.1 in Datasheet */
1021
1022         /* Set the CCA threshold to -50 dBm. This seems to have been copied
1023          * from the TinyOS CC2520 driver and is much higher than the -84 dBm
1024          * threshold suggested in the datasheet.
1025          */
1026         ret = cc2520_write_register(priv, CC2520_CCACTRL0, 0x1A);
1027         if (ret)
1028                 goto err_ret;
1029
1030         ret = cc2520_write_register(priv, CC2520_MDMCTRL0, 0x85);
1031         if (ret)
1032                 goto err_ret;
1033
1034         ret = cc2520_write_register(priv, CC2520_MDMCTRL1, 0x14);
1035         if (ret)
1036                 goto err_ret;
1037
1038         ret = cc2520_write_register(priv, CC2520_RXCTRL, 0x3f);
1039         if (ret)
1040                 goto err_ret;
1041
1042         ret = cc2520_write_register(priv, CC2520_FSCTRL, 0x5a);
1043         if (ret)
1044                 goto err_ret;
1045
1046         ret = cc2520_write_register(priv, CC2520_FSCAL1, 0x2b);
1047         if (ret)
1048                 goto err_ret;
1049
1050         ret = cc2520_write_register(priv, CC2520_ADCTEST0, 0x10);
1051         if (ret)
1052                 goto err_ret;
1053
1054         ret = cc2520_write_register(priv, CC2520_ADCTEST1, 0x0e);
1055         if (ret)
1056                 goto err_ret;
1057
1058         ret = cc2520_write_register(priv, CC2520_ADCTEST2, 0x03);
1059         if (ret)
1060                 goto err_ret;
1061
1062         /* Configure registers correctly for this driver. */
1063         ret = cc2520_write_register(priv, CC2520_FRMCTRL1,
1064                                     FRMCTRL1_SET_RXENMASK_ON_TX |
1065                                     FRMCTRL1_IGNORE_TX_UNDERF);
1066         if (ret)
1067                 goto err_ret;
1068
1069         ret = cc2520_write_register(priv, CC2520_FIFOPCTRL, 127);
1070         if (ret)
1071                 goto err_ret;
1072
1073         return 0;
1074
1075 err_ret:
1076         return ret;
1077 }
1078
1079 static int cc2520_probe(struct spi_device *spi)
1080 {
1081         struct cc2520_private *priv;
1082         struct cc2520_platform_data pdata;
1083         int ret;
1084
1085         priv = devm_kzalloc(&spi->dev, sizeof(*priv), GFP_KERNEL);
1086         if (!priv)
1087                 return -ENOMEM;
1088
1089         spi_set_drvdata(spi, priv);
1090
1091         ret = cc2520_get_platform_data(spi, &pdata);
1092         if (ret < 0) {
1093                 dev_err(&spi->dev, "no platform data\n");
1094                 return -EINVAL;
1095         }
1096
1097         priv->spi = spi;
1098
1099         priv->buf = devm_kzalloc(&spi->dev,
1100                                  SPI_COMMAND_BUFFER, GFP_KERNEL);
1101         if (!priv->buf)
1102                 return -ENOMEM;
1103
1104         mutex_init(&priv->buffer_mutex);
1105         INIT_WORK(&priv->fifop_irqwork, cc2520_fifop_irqwork);
1106         spin_lock_init(&priv->lock);
1107         init_completion(&priv->tx_complete);
1108
1109         /* Assumption that CC2591 is not connected */
1110         priv->amplified = false;
1111
1112         /* Request all the gpio's */
1113         if (!gpio_is_valid(pdata.fifo)) {
1114                 dev_err(&spi->dev, "fifo gpio is not valid\n");
1115                 ret = -EINVAL;
1116                 goto err_hw_init;
1117         }
1118
1119         ret = devm_gpio_request_one(&spi->dev, pdata.fifo,
1120                                     GPIOF_IN, "fifo");
1121         if (ret)
1122                 goto err_hw_init;
1123
1124         if (!gpio_is_valid(pdata.cca)) {
1125                 dev_err(&spi->dev, "cca gpio is not valid\n");
1126                 ret = -EINVAL;
1127                 goto err_hw_init;
1128         }
1129
1130         ret = devm_gpio_request_one(&spi->dev, pdata.cca,
1131                                     GPIOF_IN, "cca");
1132         if (ret)
1133                 goto err_hw_init;
1134
1135         if (!gpio_is_valid(pdata.fifop)) {
1136                 dev_err(&spi->dev, "fifop gpio is not valid\n");
1137                 ret = -EINVAL;
1138                 goto err_hw_init;
1139         }
1140
1141         ret = devm_gpio_request_one(&spi->dev, pdata.fifop,
1142                                     GPIOF_IN, "fifop");
1143         if (ret)
1144                 goto err_hw_init;
1145
1146         if (!gpio_is_valid(pdata.sfd)) {
1147                 dev_err(&spi->dev, "sfd gpio is not valid\n");
1148                 ret = -EINVAL;
1149                 goto err_hw_init;
1150         }
1151
1152         ret = devm_gpio_request_one(&spi->dev, pdata.sfd,
1153                                     GPIOF_IN, "sfd");
1154         if (ret)
1155                 goto err_hw_init;
1156
1157         if (!gpio_is_valid(pdata.reset)) {
1158                 dev_err(&spi->dev, "reset gpio is not valid\n");
1159                 ret = -EINVAL;
1160                 goto err_hw_init;
1161         }
1162
1163         ret = devm_gpio_request_one(&spi->dev, pdata.reset,
1164                                     GPIOF_OUT_INIT_LOW, "reset");
1165         if (ret)
1166                 goto err_hw_init;
1167
1168         if (!gpio_is_valid(pdata.vreg)) {
1169                 dev_err(&spi->dev, "vreg gpio is not valid\n");
1170                 ret = -EINVAL;
1171                 goto err_hw_init;
1172         }
1173
1174         ret = devm_gpio_request_one(&spi->dev, pdata.vreg,
1175                                     GPIOF_OUT_INIT_LOW, "vreg");
1176         if (ret)
1177                 goto err_hw_init;
1178
1179         gpio_set_value(pdata.vreg, HIGH);
1180         usleep_range(100, 150);
1181
1182         gpio_set_value(pdata.reset, HIGH);
1183         usleep_range(200, 250);
1184
1185         ret = cc2520_hw_init(priv);
1186         if (ret)
1187                 goto err_hw_init;
1188
1189         /* Set up fifop interrupt */
1190         ret = devm_request_irq(&spi->dev,
1191                                gpio_to_irq(pdata.fifop),
1192                                cc2520_fifop_isr,
1193                                IRQF_TRIGGER_RISING,
1194                                dev_name(&spi->dev),
1195                                priv);
1196         if (ret) {
1197                 dev_err(&spi->dev, "could not get fifop irq\n");
1198                 goto err_hw_init;
1199         }
1200
1201         /* Set up sfd interrupt */
1202         ret = devm_request_irq(&spi->dev,
1203                                gpio_to_irq(pdata.sfd),
1204                                cc2520_sfd_isr,
1205                                IRQF_TRIGGER_FALLING,
1206                                dev_name(&spi->dev),
1207                                priv);
1208         if (ret) {
1209                 dev_err(&spi->dev, "could not get sfd irq\n");
1210                 goto err_hw_init;
1211         }
1212
1213         ret = cc2520_register(priv);
1214         if (ret)
1215                 goto err_hw_init;
1216
1217         return 0;
1218
1219 err_hw_init:
1220         mutex_destroy(&priv->buffer_mutex);
1221         flush_work(&priv->fifop_irqwork);
1222         return ret;
1223 }
1224
1225 static int cc2520_remove(struct spi_device *spi)
1226 {
1227         struct cc2520_private *priv = spi_get_drvdata(spi);
1228
1229         mutex_destroy(&priv->buffer_mutex);
1230         flush_work(&priv->fifop_irqwork);
1231
1232         ieee802154_unregister_hw(priv->hw);
1233         ieee802154_free_hw(priv->hw);
1234
1235         return 0;
1236 }
1237
1238 static const struct spi_device_id cc2520_ids[] = {
1239         {"cc2520", },
1240         {},
1241 };
1242 MODULE_DEVICE_TABLE(spi, cc2520_ids);
1243
1244 static const struct of_device_id cc2520_of_ids[] = {
1245         {.compatible = "ti,cc2520", },
1246         {},
1247 };
1248 MODULE_DEVICE_TABLE(of, cc2520_of_ids);
1249
1250 /* SPI driver structure */
1251 static struct spi_driver cc2520_driver = {
1252         .driver = {
1253                 .name = "cc2520",
1254                 .of_match_table = of_match_ptr(cc2520_of_ids),
1255         },
1256         .id_table = cc2520_ids,
1257         .probe = cc2520_probe,
1258         .remove = cc2520_remove,
1259 };
1260 module_spi_driver(cc2520_driver);
1261
1262 MODULE_AUTHOR("Varka Bhadram <varkab@cdac.in>");
1263 MODULE_DESCRIPTION("CC2520 Transceiver Driver");
1264 MODULE_LICENSE("GPL v2");