drivers/net/wireless/p54/p54spi.c

   1 /*
   2  * Copyright (C) 2008 Christian Lamparter <chunkeey@web.de>
   3  * Copyright 2008       Johannes Berg <johannes@sipsolutions.net>
   4  *
   5  * This driver is a port from stlc45xx:
   6  *      Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/firmware.h>
  27 #include <linux/delay.h>
  28 #include <linux/irq.h>
  29 #include <linux/spi/spi.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/gpio.h>
  32
  33 #include "p54spi.h"
  34 #include "p54spi_eeprom.h"
  35 #include "p54.h"
  36
  37 #include "lmac.h"
  38
  39 MODULE_FIRMWARE("3826.arm");
  40 MODULE_ALIAS("stlc45xx");
  41
  42 /*
  43  * gpios should be handled in board files and provided via platform data,
  44  * but because it's currently impossible for p54spi to have a header file
  45  * in include/linux, let's use module paramaters for now
  46  */
  47
  48 static int p54spi_gpio_power = 97;
  49 module_param(p54spi_gpio_power, int, 0444);
  50 MODULE_PARM_DESC(p54spi_gpio_power, "gpio number for power line");
  51
  52 static int p54spi_gpio_irq = 87;
  53 module_param(p54spi_gpio_irq, int, 0444);
  54 MODULE_PARM_DESC(p54spi_gpio_irq, "gpio number for irq line");
  55
  56 static void p54spi_spi_read(struct p54s_priv *priv, u8 address,
  57                               void *buf, size_t len)
  58 {
  59         struct spi_transfer t[2];
  60         struct spi_message m;
  61         __le16 addr;
  62
  63         /* We first push the address */
  64         addr = cpu_to_le16(address << 8 | SPI_ADRS_READ_BIT_15);
  65
  66         spi_message_init(&m);
  67         memset(t, 0, sizeof(t));
  68
  69         t[0].tx_buf = &addr;
  70         t[0].len = sizeof(addr);
  71         spi_message_add_tail(&t[0], &m);
  72
  73         t[1].rx_buf = buf;
  74         t[1].len = len;
  75         spi_message_add_tail(&t[1], &m);
  76
  77         spi_sync(priv->spi, &m);
  78 }
  79
  80
  81 static void p54spi_spi_write(struct p54s_priv *priv, u8 address,
  82                              const void *buf, size_t len)
  83 {
  84         struct spi_transfer t[3];
  85         struct spi_message m;
  86         __le16 addr;
  87
  88         /* We first push the address */
  89         addr = cpu_to_le16(address << 8);
  90
  91         spi_message_init(&m);
  92         memset(t, 0, sizeof(t));
  93
  94         t[0].tx_buf = &addr;
  95         t[0].len = sizeof(addr);
  96         spi_message_add_tail(&t[0], &m);
  97
  98         t[1].tx_buf = buf;
  99         t[1].len = len & ~1;
 100         spi_message_add_tail(&t[1], &m);
 101
 102         if (len % 2) {
 103                 __le16 last_word;
 104                 last_word = cpu_to_le16(((u8 *)buf)[len - 1]);
 105
 106                 t[2].tx_buf = &last_word;
 107                 t[2].len = sizeof(last_word);
 108                 spi_message_add_tail(&t[2], &m);
 109         }
 110
 111         spi_sync(priv->spi, &m);
 112 }
 113
 114 static u32 p54spi_read32(struct p54s_priv *priv, u8 addr)
 115 {
 116         __le32 val;
 117
 118         p54spi_spi_read(priv, addr, &val, sizeof(val));
 119
 120         return le32_to_cpu(val);
 121 }
 122
 123 static inline void p54spi_write16(struct p54s_priv *priv, u8 addr, __le16 val)
 124 {
 125         p54spi_spi_write(priv, addr, &val, sizeof(val));
 126 }
 127
 128 static inline void p54spi_write32(struct p54s_priv *priv, u8 addr, __le32 val)
 129 {
 130         p54spi_spi_write(priv, addr, &val, sizeof(val));
 131 }
 132
 133 static int p54spi_wait_bit(struct p54s_priv *priv, u16 reg, u32 bits)
 134 {
 135         int i;
 136
 137         for (i = 0; i < 2000; i++) {
 138                 u32 buffer = p54spi_read32(priv, reg);
 139                 if ((buffer & bits) == bits)
 140                         return 1;
 141         }
 142         return 0;
 143 }
 144
 145 static int p54spi_spi_write_dma(struct p54s_priv *priv, __le32 base,
 146                                 const void *buf, size_t len)
 147 {
 148         if (!p54spi_wait_bit(priv, SPI_ADRS_DMA_WRITE_CTRL, HOST_ALLOWED)) {
 149                 dev_err(&priv->spi->dev, "spi_write_dma not allowed "
 150                         "to DMA write.\n");
 151                 return -EAGAIN;
 152         }
 153
 154         p54spi_write16(priv, SPI_ADRS_DMA_WRITE_CTRL,
 155                        cpu_to_le16(SPI_DMA_WRITE_CTRL_ENABLE));
 156
 157         p54spi_write16(priv, SPI_ADRS_DMA_WRITE_LEN, cpu_to_le16(len));
 158         p54spi_write32(priv, SPI_ADRS_DMA_WRITE_BASE, base);
 159         p54spi_spi_write(priv, SPI_ADRS_DMA_DATA, buf, len);
 160         return 0;
 161 }
 162
 163 static int p54spi_request_firmware(struct ieee80211_hw *dev)
 164 {
 165         struct p54s_priv *priv = dev->priv;
 166         int ret;
 167
 168         /* FIXME: should driver use it's own struct device? */
 169         ret = request_firmware(&priv->firmware, "3826.arm", &priv->spi->dev);
 170
 171         if (ret < 0) {
 172                 dev_err(&priv->spi->dev, "request_firmware() failed: %d", ret);
 173                 return ret;
 174         }
 175
 176         ret = p54_parse_firmware(dev, priv->firmware);
 177         if (ret) {
 178                 release_firmware(priv->firmware);
 179                 return ret;
 180         }
 181
 182         return 0;
 183 }
 184
 185 static int p54spi_request_eeprom(struct ieee80211_hw *dev)
 186 {
 187         struct p54s_priv *priv = dev->priv;
 188         const struct firmware *eeprom;
 189         int ret;
 190
 191         /*
 192          * allow users to customize their eeprom.
 193          */
 194
 195         ret = request_firmware(&eeprom, "3826.eeprom", &priv->spi->dev);
 196         if (ret < 0) {
 197                 dev_info(&priv->spi->dev, "loading default eeprom...\n");
 198                 ret = p54_parse_eeprom(dev, (void *) p54spi_eeprom,
 199                                        sizeof(p54spi_eeprom));
 200         } else {
 201                 dev_info(&priv->spi->dev, "loading user eeprom...\n");
 202                 ret = p54_parse_eeprom(dev, (void *) eeprom->data,
 203                                        (int)eeprom->size);
 204                 release_firmware(eeprom);
 205         }
 206         return ret;
 207 }
 208
 209 static int p54spi_upload_firmware(struct ieee80211_hw *dev)
 210 {
 211         struct p54s_priv *priv = dev->priv;
 212         unsigned long fw_len, _fw_len;
 213         unsigned int offset = 0;
 214         int err = 0;
 215         u8 *fw;
 216
 217         fw_len = priv->firmware->size;
 218         fw = kmemdup(priv->firmware->data, fw_len, GFP_KERNEL);
 219         if (!fw)
 220                 return -ENOMEM;
 221
 222         /* stop the device */
 223         p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
 224                        SPI_CTRL_STAT_HOST_OVERRIDE | SPI_CTRL_STAT_HOST_RESET |
 225                        SPI_CTRL_STAT_START_HALTED));
 226
 227         msleep(TARGET_BOOT_SLEEP);
 228
 229         p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
 230                        SPI_CTRL_STAT_HOST_OVERRIDE |
 231                        SPI_CTRL_STAT_START_HALTED));
 232
 233         msleep(TARGET_BOOT_SLEEP);
 234
 235         while (fw_len > 0) {
 236                 _fw_len = min_t(long, fw_len, SPI_MAX_PACKET_SIZE);
 237
 238                 err = p54spi_spi_write_dma(priv, cpu_to_le32(
 239                                            ISL38XX_DEV_FIRMWARE_ADDR + offset),
 240                                            (fw + offset), _fw_len);
 241                 if (err < 0)
 242                         goto out;
 243
 244                 fw_len -= _fw_len;
 245                 offset += _fw_len;
 246         }
 247
 248         BUG_ON(fw_len != 0);
 249
 250         /* enable host interrupts */
 251         p54spi_write32(priv, SPI_ADRS_HOST_INT_EN,
 252                        cpu_to_le32(SPI_HOST_INTS_DEFAULT));
 253
 254         /* boot the device */
 255         p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
 256                        SPI_CTRL_STAT_HOST_OVERRIDE | SPI_CTRL_STAT_HOST_RESET |
 257                        SPI_CTRL_STAT_RAM_BOOT));
 258
 259         msleep(TARGET_BOOT_SLEEP);
 260
 261         p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
 262                        SPI_CTRL_STAT_HOST_OVERRIDE | SPI_CTRL_STAT_RAM_BOOT));
 263         msleep(TARGET_BOOT_SLEEP);
 264
 265 out:
 266         kfree(fw);
 267         return err;
 268 }
 269
 270 static void p54spi_power_off(struct p54s_priv *priv)
 271 {
 272         disable_irq(gpio_to_irq(p54spi_gpio_irq));
 273         gpio_set_value(p54spi_gpio_power, 0);
 274 }
 275
 276 static void p54spi_power_on(struct p54s_priv *priv)
 277 {
 278         gpio_set_value(p54spi_gpio_power, 1);
 279         enable_irq(gpio_to_irq(p54spi_gpio_irq));
 280
 281         /*
 282          * need to wait a while before device can be accessed, the lenght
 283          * is just a guess
 284          */
 285         msleep(10);
 286 }
 287
 288 static inline void p54spi_int_ack(struct p54s_priv *priv, u32 val)
 289 {
 290         p54spi_write32(priv, SPI_ADRS_HOST_INT_ACK, cpu_to_le32(val));
 291 }
 292
 293 static int p54spi_wakeup(struct p54s_priv *priv)
 294 {
 295         /* wake the chip */
 296         p54spi_write32(priv, SPI_ADRS_ARM_INTERRUPTS,
 297                        cpu_to_le32(SPI_TARGET_INT_WAKEUP));
 298
 299         /* And wait for the READY interrupt */
 300         if (!p54spi_wait_bit(priv, SPI_ADRS_HOST_INTERRUPTS,
 301                              SPI_HOST_INT_READY)) {
 302                 dev_err(&priv->spi->dev, "INT_READY timeout\n");
 303                 return -EBUSY;
 304         }
 305
 306         p54spi_int_ack(priv, SPI_HOST_INT_READY);
 307         return 0;
 308 }
 309
 310 static inline void p54spi_sleep(struct p54s_priv *priv)
 311 {
 312         p54spi_write32(priv, SPI_ADRS_ARM_INTERRUPTS,
 313                        cpu_to_le32(SPI_TARGET_INT_SLEEP));
 314 }
 315
 316 static void p54spi_int_ready(struct p54s_priv *priv)
 317 {
 318         p54spi_write32(priv, SPI_ADRS_HOST_INT_EN, cpu_to_le32(
 319                        SPI_HOST_INT_UPDATE | SPI_HOST_INT_SW_UPDATE));
 320
 321         switch (priv->fw_state) {
 322         case FW_STATE_BOOTING:
 323                 priv->fw_state = FW_STATE_READY;
 324                 complete(&priv->fw_comp);
 325                 break;
 326         case FW_STATE_RESETTING:
 327                 priv->fw_state = FW_STATE_READY;
 328                 /* TODO: reinitialize state */
 329                 break;
 330         default:
 331                 break;
 332         }
 333 }
 334
 335 static int p54spi_rx(struct p54s_priv *priv)
 336 {
 337         struct sk_buff *skb;
 338         u16 len;
 339         u16 rx_head[2];
 340 #define READAHEAD_SZ (sizeof(rx_head)-sizeof(u16))
 341
 342         if (p54spi_wakeup(priv) < 0)
 343                 return -EBUSY;
 344
 345         /* Read data size and first data word in one SPI transaction
 346          * This is workaround for firmware/DMA bug,
 347          * when first data word gets lost under high load.
 348          */
 349         p54spi_spi_read(priv, SPI_ADRS_DMA_DATA, rx_head, sizeof(rx_head));
 350         len = rx_head[0];
 351
 352         if (len == 0) {
 353                 p54spi_sleep(priv);
 354                 dev_err(&priv->spi->dev, "rx request of zero bytes\n");
 355                 return 0;
 356         }
 357
 358         /* Firmware may insert up to 4 padding bytes after the lmac header,
 359          * but it does not amend the size of SPI data transfer.
 360          * Such packets has correct data size in header, thus referencing
 361          * past the end of allocated skb. Reserve extra 4 bytes for this case */
 362         skb = dev_alloc_skb(len + 4);
 363         if (!skb) {
 364                 p54spi_sleep(priv);
 365                 dev_err(&priv->spi->dev, "could not alloc skb");
 366                 return -ENOMEM;
 367         }
 368
 369         if (len <= READAHEAD_SZ) {
 370                 memcpy(skb_put(skb, len), rx_head + 1, len);
 371         } else {
 372                 memcpy(skb_put(skb, READAHEAD_SZ), rx_head + 1, READAHEAD_SZ);
 373                 p54spi_spi_read(priv, SPI_ADRS_DMA_DATA,
 374                                 skb_put(skb, len - READAHEAD_SZ),
 375                                 len - READAHEAD_SZ);
 376         }
 377         p54spi_sleep(priv);
 378         /* Put additional bytes to compensate for the possible
 379          * alignment-caused truncation */
 380         skb_put(skb, 4);
 381
 382         if (p54_rx(priv->hw, skb) == 0)
 383                 dev_kfree_skb(skb);
 384
 385         return 0;
 386 }
 387
 388
 389 static irqreturn_t p54spi_interrupt(int irq, void *config)
 390 {
 391         struct spi_device *spi = config;
 392         struct p54s_priv *priv = dev_get_drvdata(&spi->dev);
 393
 394         ieee80211_queue_work(priv->hw, &priv->work);
 395
 396         return IRQ_HANDLED;
 397 }
 398
 399 static int p54spi_tx_frame(struct p54s_priv *priv, struct sk_buff *skb)
 400 {
 401         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 402         int ret = 0;
 403
 404         if (p54spi_wakeup(priv) < 0)
 405                 return -EBUSY;
 406
 407         ret = p54spi_spi_write_dma(priv, hdr->req_id, skb->data, skb->len);
 408         if (ret < 0)
 409                 goto out;
 410
 411         if (!p54spi_wait_bit(priv, SPI_ADRS_HOST_INTERRUPTS,
 412                              SPI_HOST_INT_WR_READY)) {
 413                 dev_err(&priv->spi->dev, "WR_READY timeout\n");
 414                 ret = -EAGAIN;
 415                 goto out;
 416         }
 417
 418         p54spi_int_ack(priv, SPI_HOST_INT_WR_READY);
 419
 420         if (FREE_AFTER_TX(skb))
 421                 p54_free_skb(priv->hw, skb);
 422 out:
 423         p54spi_sleep(priv);
 424         return ret;
 425 }
 426
 427 static int p54spi_wq_tx(struct p54s_priv *priv)
 428 {
 429         struct p54s_tx_info *entry;
 430         struct sk_buff *skb;
 431         struct ieee80211_tx_info *info;
 432         struct p54_tx_info *minfo;
 433         struct p54s_tx_info *dinfo;
 434         unsigned long flags;
 435         int ret = 0;
 436
 437         spin_lock_irqsave(&priv->tx_lock, flags);
 438
 439         while (!list_empty(&priv->tx_pending)) {
 440                 entry = list_entry(priv->tx_pending.next,
 441                                    struct p54s_tx_info, tx_list);
 442
 443                 list_del_init(&entry->tx_list);
 444
 445                 spin_unlock_irqrestore(&priv->tx_lock, flags);
 446
 447                 dinfo = container_of((void *) entry, struct p54s_tx_info,
 448                                      tx_list);
 449                 minfo = container_of((void *) dinfo, struct p54_tx_info,
 450                                      data);
 451                 info = container_of((void *) minfo, struct ieee80211_tx_info,
 452                                     rate_driver_data);
 453                 skb = container_of((void *) info, struct sk_buff, cb);
 454
 455                 ret = p54spi_tx_frame(priv, skb);
 456
 457                 if (ret < 0) {
 458                         p54_free_skb(priv->hw, skb);
 459                         return ret;
 460                 }
 461
 462                 spin_lock_irqsave(&priv->tx_lock, flags);
 463         }
 464         spin_unlock_irqrestore(&priv->tx_lock, flags);
 465         return ret;
 466 }
 467
 468 static void p54spi_op_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
 469 {
 470         struct p54s_priv *priv = dev->priv;
 471         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 472         struct p54_tx_info *mi = (struct p54_tx_info *) info->rate_driver_data;
 473         struct p54s_tx_info *di = (struct p54s_tx_info *) mi->data;
 474         unsigned long flags;
 475
 476         BUILD_BUG_ON(sizeof(*di) > sizeof((mi->data)));
 477
 478         spin_lock_irqsave(&priv->tx_lock, flags);
 479         list_add_tail(&di->tx_list, &priv->tx_pending);
 480         spin_unlock_irqrestore(&priv->tx_lock, flags);
 481
 482         ieee80211_queue_work(priv->hw, &priv->work);
 483 }
 484
 485 static void p54spi_work(struct work_struct *work)
 486 {
 487         struct p54s_priv *priv = container_of(work, struct p54s_priv, work);
 488         u32 ints;
 489         int ret;
 490
 491         mutex_lock(&priv->mutex);
 492
 493         if (priv->fw_state == FW_STATE_OFF)
 494                 goto out;
 495
 496         ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
 497
 498         if (ints & SPI_HOST_INT_READY) {
 499                 p54spi_int_ready(priv);
 500                 p54spi_int_ack(priv, SPI_HOST_INT_READY);
 501         }
 502
 503         if (priv->fw_state != FW_STATE_READY)
 504                 goto out;
 505
 506         if (ints & SPI_HOST_INT_UPDATE) {
 507                 p54spi_int_ack(priv, SPI_HOST_INT_UPDATE);
 508                 ret = p54spi_rx(priv);
 509                 if (ret < 0)
 510                         goto out;
 511         }
 512         if (ints & SPI_HOST_INT_SW_UPDATE) {
 513                 p54spi_int_ack(priv, SPI_HOST_INT_SW_UPDATE);
 514                 ret = p54spi_rx(priv);
 515                 if (ret < 0)
 516                         goto out;
 517         }
 518
 519         ret = p54spi_wq_tx(priv);
 520 out:
 521         mutex_unlock(&priv->mutex);
 522 }
 523
 524 static int p54spi_op_start(struct ieee80211_hw *dev)
 525 {
 526         struct p54s_priv *priv = dev->priv;
 527         unsigned long timeout;
 528         int ret = 0;
 529
 530         if (mutex_lock_interruptible(&priv->mutex)) {
 531                 ret = -EINTR;
 532                 goto out;
 533         }
 534
 535         priv->fw_state = FW_STATE_BOOTING;
 536
 537         p54spi_power_on(priv);
 538
 539         ret = p54spi_upload_firmware(dev);
 540         if (ret < 0) {
 541                 p54spi_power_off(priv);
 542                 goto out_unlock;
 543         }
 544
 545         mutex_unlock(&priv->mutex);
 546
 547         timeout = msecs_to_jiffies(2000);
 548         timeout = wait_for_completion_interruptible_timeout(&priv->fw_comp,
 549                                                             timeout);
 550         if (!timeout) {
 551                 dev_err(&priv->spi->dev, "firmware boot failed");
 552                 p54spi_power_off(priv);
 553                 ret = -1;
 554                 goto out;
 555         }
 556
 557         if (mutex_lock_interruptible(&priv->mutex)) {
 558                 ret = -EINTR;
 559                 p54spi_power_off(priv);
 560                 goto out;
 561         }
 562
 563         WARN_ON(priv->fw_state != FW_STATE_READY);
 564
 565 out_unlock:
 566         mutex_unlock(&priv->mutex);
 567
 568 out:
 569         return ret;
 570 }
 571
 572 static void p54spi_op_stop(struct ieee80211_hw *dev)
 573 {
 574         struct p54s_priv *priv = dev->priv;
 575         unsigned long flags;
 576
 577         if (mutex_lock_interruptible(&priv->mutex)) {
 578                 /* FIXME: how to handle this error? */
 579                 return;
 580         }
 581
 582         WARN_ON(priv->fw_state != FW_STATE_READY);
 583
 584         cancel_work_sync(&priv->work);
 585
 586         p54spi_power_off(priv);
 587         spin_lock_irqsave(&priv->tx_lock, flags);
 588         INIT_LIST_HEAD(&priv->tx_pending);
 589         spin_unlock_irqrestore(&priv->tx_lock, flags);
 590
 591         priv->fw_state = FW_STATE_OFF;
 592         mutex_unlock(&priv->mutex);
 593 }
 594
 595 static int __devinit p54spi_probe(struct spi_device *spi)
 596 {
 597         struct p54s_priv *priv = NULL;
 598         struct ieee80211_hw *hw;
 599         int ret = -EINVAL;
 600
 601         hw = p54_init_common(sizeof(*priv));
 602         if (!hw) {
 603                 dev_err(&spi->dev, "could not alloc ieee80211_hw");
 604                 return -ENOMEM;
 605         }
 606
 607         priv = hw->priv;
 608         priv->hw = hw;
 609         dev_set_drvdata(&spi->dev, priv);
 610         priv->spi = spi;
 611
 612         spi->bits_per_word = 16;
 613         spi->max_speed_hz = 24000000;
 614
 615         ret = spi_setup(spi);
 616         if (ret < 0) {
 617                 dev_err(&priv->spi->dev, "spi_setup failed");
 618                 goto err_free_common;
 619         }
 620
 621         ret = gpio_request(p54spi_gpio_power, "p54spi power");
 622         if (ret < 0) {
 623                 dev_err(&priv->spi->dev, "power GPIO request failed: %d", ret);
 624                 goto err_free_common;
 625         }
 626
 627         ret = gpio_request(p54spi_gpio_irq, "p54spi irq");
 628         if (ret < 0) {
 629                 dev_err(&priv->spi->dev, "irq GPIO request failed: %d", ret);
 630                 goto err_free_common;
 631         }
 632
 633         gpio_direction_output(p54spi_gpio_power, 0);
 634         gpio_direction_input(p54spi_gpio_irq);
 635
 636         ret = request_irq(gpio_to_irq(p54spi_gpio_irq),
 637                           p54spi_interrupt, IRQF_DISABLED, "p54spi",
 638                           priv->spi);
 639         if (ret < 0) {
 640                 dev_err(&priv->spi->dev, "request_irq() failed");
 641                 goto err_free_common;
 642         }
 643
 644         set_irq_type(gpio_to_irq(p54spi_gpio_irq),
 645                      IRQ_TYPE_EDGE_RISING);
 646
 647         disable_irq(gpio_to_irq(p54spi_gpio_irq));
 648
 649         INIT_WORK(&priv->work, p54spi_work);
 650         init_completion(&priv->fw_comp);
 651         INIT_LIST_HEAD(&priv->tx_pending);
 652         mutex_init(&priv->mutex);
 653         SET_IEEE80211_DEV(hw, &spi->dev);
 654         priv->common.open = p54spi_op_start;
 655         priv->common.stop = p54spi_op_stop;
 656         priv->common.tx = p54spi_op_tx;
 657
 658         ret = p54spi_request_firmware(hw);
 659         if (ret < 0)
 660                 goto err_free_common;
 661
 662         ret = p54spi_request_eeprom(hw);
 663         if (ret)
 664                 goto err_free_common;
 665
 666         ret = p54_register_common(hw, &priv->spi->dev);
 667         if (ret)
 668                 goto err_free_common;
 669
 670         return 0;
 671
 672 err_free_common:
 673         p54_free_common(priv->hw);
 674         return ret;
 675 }
 676
 677 static int __devexit p54spi_remove(struct spi_device *spi)
 678 {
 679         struct p54s_priv *priv = dev_get_drvdata(&spi->dev);
 680
 681         p54_unregister_common(priv->hw);
 682
 683         free_irq(gpio_to_irq(p54spi_gpio_irq), spi);
 684
 685         gpio_free(p54spi_gpio_power);
 686         gpio_free(p54spi_gpio_irq);
 687         release_firmware(priv->firmware);
 688
 689         mutex_destroy(&priv->mutex);
 690
 691         p54_free_common(priv->hw);
 692
 693         return 0;
 694 }
 695
 696
 697 static struct spi_driver p54spi_driver = {
 698         .driver = {
 699                 /* use cx3110x name because board-n800.c uses that for the
 700                  * SPI port */
 701                 .name           = "cx3110x",
 702                 .bus            = &spi_bus_type,
 703                 .owner          = THIS_MODULE,
 704         },
 705
 706         .probe          = p54spi_probe,
 707         .remove         = __devexit_p(p54spi_remove),
 708 };
 709
 710 static int __init p54spi_init(void)
 711 {
 712         int ret;
 713
 714         ret = spi_register_driver(&p54spi_driver);
 715         if (ret < 0) {
 716                 printk(KERN_ERR "failed to register SPI driver: %d", ret);
 717                 goto out;
 718         }
 719
 720 out:
 721         return ret;
 722 }
 723
 724 static void __exit p54spi_exit(void)
 725 {
 726         spi_unregister_driver(&p54spi_driver);
 727 }
 728
 729 module_init(p54spi_init);
 730 module_exit(p54spi_exit);
 731
 732 MODULE_LICENSE("GPL");
 733 MODULE_AUTHOR("Christian Lamparter <chunkeey@web.de>");
 734 MODULE_ALIAS("spi:cx3110x");