git.oblomov.eu Git - linux-2.6/blob - 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 "p54common.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;
 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 u16 p54spi_read16(struct p54s_priv *priv, u8 addr)
 115 {
 116         __le16 val;
 117
 118         p54spi_spi_read(priv, addr, &val, sizeof(val));
 119
 120         return le16_to_cpu(val);
 121 }
 122
 123 static u32 p54spi_read32(struct p54s_priv *priv, u8 addr)
 124 {
 125         __le32 val;
 126
 127         p54spi_spi_read(priv, addr, &val, sizeof(val));
 128
 129         return le32_to_cpu(val);
 130 }
 131
 132 static inline void p54spi_write16(struct p54s_priv *priv, u8 addr, __le16 val)
 133 {
 134         p54spi_spi_write(priv, addr, &val, sizeof(val));
 135 }
 136
 137 static inline void p54spi_write32(struct p54s_priv *priv, u8 addr, __le32 val)
 138 {
 139         p54spi_spi_write(priv, addr, &val, sizeof(val));
 140 }
 141
 142 struct p54spi_spi_reg {
 143         u16 address;            /* __le16 ? */
 144         u16 length;
 145         char *name;
 146 };
 147
 148 static const struct p54spi_spi_reg p54spi_registers_array[] =
 149 {
 150         { SPI_ADRS_ARM_INTERRUPTS,      32, "ARM_INT     " },
 151         { SPI_ADRS_ARM_INT_EN,          32, "ARM_INT_ENA " },
 152         { SPI_ADRS_HOST_INTERRUPTS,     32, "HOST_INT    " },
 153         { SPI_ADRS_HOST_INT_EN,         32, "HOST_INT_ENA" },
 154         { SPI_ADRS_HOST_INT_ACK,        32, "HOST_INT_ACK" },
 155         { SPI_ADRS_GEN_PURP_1,          32, "GP1_COMM    " },
 156         { SPI_ADRS_GEN_PURP_2,          32, "GP2_COMM    " },
 157         { SPI_ADRS_DEV_CTRL_STAT,       32, "DEV_CTRL_STA" },
 158         { SPI_ADRS_DMA_DATA,            16, "DMA_DATA    " },
 159         { SPI_ADRS_DMA_WRITE_CTRL,      16, "DMA_WR_CTRL " },
 160         { SPI_ADRS_DMA_WRITE_LEN,       16, "DMA_WR_LEN  " },
 161         { SPI_ADRS_DMA_WRITE_BASE,      32, "DMA_WR_BASE " },
 162         { SPI_ADRS_DMA_READ_CTRL,       16, "DMA_RD_CTRL " },
 163         { SPI_ADRS_DMA_READ_LEN,        16, "DMA_RD_LEN  " },
 164         { SPI_ADRS_DMA_WRITE_BASE,      32, "DMA_RD_BASE " }
 165 };
 166
 167 static int p54spi_wait_bit(struct p54s_priv *priv, u16 reg, __le32 bits)
 168 {
 169         int i;
 170
 171         for (i = 0; i < 2000; i++) {
 172                 __le32 buffer = p54spi_read32(priv, reg);
 173                 if ((buffer & bits) == bits)
 174                         return 1;
 175
 176                 msleep(0);
 177         }
 178         return 0;
 179 }
 180
 181 static int p54spi_spi_write_dma(struct p54s_priv *priv, __le32 base,
 182                                 const void *buf, size_t len)
 183 {
 184         p54spi_write16(priv, SPI_ADRS_DMA_WRITE_CTRL,
 185                        cpu_to_le16(SPI_DMA_WRITE_CTRL_ENABLE));
 186
 187         if (!p54spi_wait_bit(priv, SPI_ADRS_DMA_WRITE_CTRL,
 188                              cpu_to_le32(HOST_ALLOWED))) {
 189                 dev_err(&priv->spi->dev, "spi_write_dma not allowed "
 190                         "to DMA write.\n");
 191                 return -EAGAIN;
 192         }
 193
 194         p54spi_write16(priv, SPI_ADRS_DMA_WRITE_LEN, cpu_to_le16(len));
 195         p54spi_write32(priv, SPI_ADRS_DMA_WRITE_BASE, base);
 196         p54spi_spi_write(priv, SPI_ADRS_DMA_DATA, buf, len);
 197         return 0;
 198 }
 199
 200 static int p54spi_request_firmware(struct ieee80211_hw *dev)
 201 {
 202         struct p54s_priv *priv = dev->priv;
 203         int ret;
 204
 205         /* FIXME: should driver use it's own struct device? */
 206         ret = request_firmware(&priv->firmware, "3826.arm", &priv->spi->dev);
 207
 208         if (ret < 0) {
 209                 dev_err(&priv->spi->dev, "request_firmware() failed: %d", ret);
 210                 return ret;
 211         }
 212
 213         ret = p54_parse_firmware(dev, priv->firmware);
 214         if (ret) {
 215                 release_firmware(priv->firmware);
 216                 return ret;
 217         }
 218
 219         return 0;
 220 }
 221
 222 static int p54spi_request_eeprom(struct ieee80211_hw *dev)
 223 {
 224         struct p54s_priv *priv = dev->priv;
 225         const struct firmware *eeprom;
 226         int ret;
 227
 228         /*
 229          * allow users to customize their eeprom.
 230          */
 231
 232         ret = request_firmware(&eeprom, "3826.eeprom", &priv->spi->dev);
 233         if (ret < 0) {
 234                 dev_info(&priv->spi->dev, "loading default eeprom...\n");
 235                 ret = p54_parse_eeprom(dev, (void *) p54spi_eeprom,
 236                                        sizeof(p54spi_eeprom));
 237         } else {
 238                 dev_info(&priv->spi->dev, "loading user eeprom...\n");
 239                 ret = p54_parse_eeprom(dev, (void *) eeprom->data,
 240                                        (int)eeprom->size);
 241                 release_firmware(eeprom);
 242         }
 243         return ret;
 244 }
 245
 246 static int p54spi_upload_firmware(struct ieee80211_hw *dev)
 247 {
 248         struct p54s_priv *priv = dev->priv;
 249         unsigned long fw_len, _fw_len;
 250         unsigned int offset = 0;
 251         int err = 0;
 252         u8 *fw;
 253
 254         fw_len = priv->firmware->size;
 255         fw = kmemdup(priv->firmware->data, fw_len, GFP_KERNEL);
 256         if (!fw)
 257                 return -ENOMEM;
 258
 259         /* stop the device */
 260         p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
 261                        SPI_CTRL_STAT_HOST_OVERRIDE | SPI_CTRL_STAT_HOST_RESET |
 262                        SPI_CTRL_STAT_START_HALTED));
 263
 264         msleep(TARGET_BOOT_SLEEP);
 265
 266         p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
 267                        SPI_CTRL_STAT_HOST_OVERRIDE |
 268                        SPI_CTRL_STAT_START_HALTED));
 269
 270         msleep(TARGET_BOOT_SLEEP);
 271
 272         while (fw_len > 0) {
 273                 _fw_len = min_t(long, fw_len, SPI_MAX_PACKET_SIZE);
 274
 275                 err = p54spi_spi_write_dma(priv, cpu_to_le32(
 276                                            ISL38XX_DEV_FIRMWARE_ADDR + offset),
 277                                            (fw + offset), _fw_len);
 278                 if (err < 0)
 279                         goto out;
 280
 281                 fw_len -= _fw_len;
 282                 offset += _fw_len;
 283         }
 284
 285         BUG_ON(fw_len != 0);
 286
 287         /* enable host interrupts */
 288         p54spi_write32(priv, SPI_ADRS_HOST_INT_EN,
 289                        cpu_to_le32(SPI_HOST_INTS_DEFAULT));
 290
 291         /* boot the device */
 292         p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
 293                        SPI_CTRL_STAT_HOST_OVERRIDE | SPI_CTRL_STAT_HOST_RESET |
 294                        SPI_CTRL_STAT_RAM_BOOT));
 295
 296         msleep(TARGET_BOOT_SLEEP);
 297
 298         p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
 299                        SPI_CTRL_STAT_HOST_OVERRIDE | SPI_CTRL_STAT_RAM_BOOT));
 300         msleep(TARGET_BOOT_SLEEP);
 301
 302 out:
 303         kfree(fw);
 304         return err;
 305 }
 306
 307 static void p54spi_power_off(struct p54s_priv *priv)
 308 {
 309         disable_irq(gpio_to_irq(p54spi_gpio_irq));
 310         gpio_set_value(p54spi_gpio_power, 0);
 311 }
 312
 313 static void p54spi_power_on(struct p54s_priv *priv)
 314 {
 315         gpio_set_value(p54spi_gpio_power, 1);
 316         enable_irq(gpio_to_irq(p54spi_gpio_irq));
 317
 318         /*
 319          * need to wait a while before device can be accessed, the lenght
 320          * is just a guess
 321          */
 322         msleep(10);
 323 }
 324
 325 static inline void p54spi_int_ack(struct p54s_priv *priv, u32 val)
 326 {
 327         p54spi_write32(priv, SPI_ADRS_HOST_INT_ACK, cpu_to_le32(val));
 328 }
 329
 330 static void p54spi_wakeup(struct p54s_priv *priv)
 331 {
 332         /* wake the chip */
 333         p54spi_write32(priv, SPI_ADRS_ARM_INTERRUPTS,
 334                        cpu_to_le32(SPI_TARGET_INT_WAKEUP));
 335
 336         /* And wait for the READY interrupt */
 337         if (!p54spi_wait_bit(priv, SPI_ADRS_HOST_INTERRUPTS,
 338                              cpu_to_le32(SPI_HOST_INT_READY))) {
 339                 dev_err(&priv->spi->dev, "INT_READY timeout\n");
 340                 goto out;
 341         }
 342
 343         p54spi_int_ack(priv, SPI_HOST_INT_READY);
 344
 345 out:
 346         return;
 347 }
 348
 349 static inline void p54spi_sleep(struct p54s_priv *priv)
 350 {
 351         p54spi_write32(priv, SPI_ADRS_ARM_INTERRUPTS,
 352                        cpu_to_le32(SPI_TARGET_INT_SLEEP));
 353 }
 354
 355 static void p54spi_int_ready(struct p54s_priv *priv)
 356 {
 357         p54spi_write32(priv, SPI_ADRS_HOST_INT_EN, cpu_to_le32(
 358                        SPI_HOST_INT_UPDATE | SPI_HOST_INT_SW_UPDATE));
 359
 360         switch (priv->fw_state) {
 361         case FW_STATE_BOOTING:
 362                 priv->fw_state = FW_STATE_READY;
 363                 complete(&priv->fw_comp);
 364                 break;
 365         case FW_STATE_RESETTING:
 366                 priv->fw_state = FW_STATE_READY;
 367                 /* TODO: reinitialize state */
 368                 break;
 369         default:
 370                 break;
 371         }
 372 }
 373
 374 static int p54spi_rx(struct p54s_priv *priv)
 375 {
 376         struct sk_buff *skb;
 377         u16 len;
 378
 379         p54spi_wakeup(priv);
 380
 381         /* dummy read to flush SPI DMA controller bug */
 382         p54spi_read16(priv, SPI_ADRS_GEN_PURP_1);
 383
 384         len = p54spi_read16(priv, SPI_ADRS_DMA_DATA);
 385
 386         if (len == 0) {
 387                 dev_err(&priv->spi->dev, "rx request of zero bytes");
 388                 return 0;
 389         }
 390
 391
 392         /* Firmware may insert up to 4 padding bytes after the lmac header,
 393          * but it does not amend the size of SPI data transfer.
 394          * Such packets has correct data size in header, thus referencing
 395          * past the end of allocated skb. Reserve extra 4 bytes for this case */
 396         skb = dev_alloc_skb(len + 4);
 397         if (!skb) {
 398                 dev_err(&priv->spi->dev, "could not alloc skb");
 399                 return 0;
 400         }
 401
 402         p54spi_spi_read(priv, SPI_ADRS_DMA_DATA, skb_put(skb, len), len);
 403         p54spi_sleep(priv);
 404         /* Put additional bytes to compensate for the possible
 405          * alignment-caused truncation */
 406         skb_put(skb, 4);
 407
 408         if (p54_rx(priv->hw, skb) == 0)
 409                 dev_kfree_skb(skb);
 410
 411         return 0;
 412 }
 413
 414
 415 static irqreturn_t p54spi_interrupt(int irq, void *config)
 416 {
 417         struct spi_device *spi = config;
 418         struct p54s_priv *priv = dev_get_drvdata(&spi->dev);
 419
 420         queue_work(priv->hw->workqueue, &priv->work);
 421
 422         return IRQ_HANDLED;
 423 }
 424
 425 static int p54spi_tx_frame(struct p54s_priv *priv, struct sk_buff *skb)
 426 {
 427         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 428         int ret = 0;
 429
 430         p54spi_wakeup(priv);
 431
 432         ret = p54spi_spi_write_dma(priv, hdr->req_id, skb->data, skb->len);
 433         if (ret < 0)
 434                 goto out;
 435
 436         if (!p54spi_wait_bit(priv, SPI_ADRS_HOST_INTERRUPTS,
 437                              cpu_to_le32(SPI_HOST_INT_WR_READY))) {
 438                 dev_err(&priv->spi->dev, "WR_READY timeout\n");
 439                 ret = -1;
 440                 goto out;
 441         }
 442
 443         p54spi_int_ack(priv, SPI_HOST_INT_WR_READY);
 444         p54spi_sleep(priv);
 445
 446         if (FREE_AFTER_TX(skb))
 447                 p54_free_skb(priv->hw, skb);
 448 out:
 449         return ret;
 450 }
 451
 452 static int p54spi_wq_tx(struct p54s_priv *priv)
 453 {
 454         struct p54s_tx_info *entry;
 455         struct sk_buff *skb;
 456         struct ieee80211_tx_info *info;
 457         struct p54_tx_info *minfo;
 458         struct p54s_tx_info *dinfo;
 459         unsigned long flags;
 460         int ret = 0;
 461
 462         spin_lock_irqsave(&priv->tx_lock, flags);
 463
 464         while (!list_empty(&priv->tx_pending)) {
 465                 entry = list_entry(priv->tx_pending.next,
 466                                    struct p54s_tx_info, tx_list);
 467
 468                 list_del_init(&entry->tx_list);
 469
 470                 spin_unlock_irqrestore(&priv->tx_lock, flags);
 471
 472                 dinfo = container_of((void *) entry, struct p54s_tx_info,
 473                                      tx_list);
 474                 minfo = container_of((void *) dinfo, struct p54_tx_info,
 475                                      data);
 476                 info = container_of((void *) minfo, struct ieee80211_tx_info,
 477                                     rate_driver_data);
 478                 skb = container_of((void *) info, struct sk_buff, cb);
 479
 480                 ret = p54spi_tx_frame(priv, skb);
 481
 482                 if (ret < 0) {
 483                         p54_free_skb(priv->hw, skb);
 484                         return ret;
 485                 }
 486
 487                 spin_lock_irqsave(&priv->tx_lock, flags);
 488         }
 489         spin_unlock_irqrestore(&priv->tx_lock, flags);
 490         return ret;
 491 }
 492
 493 static void p54spi_op_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
 494 {
 495         struct p54s_priv *priv = dev->priv;
 496         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 497         struct p54_tx_info *mi = (struct p54_tx_info *) info->rate_driver_data;
 498         struct p54s_tx_info *di = (struct p54s_tx_info *) mi->data;
 499         unsigned long flags;
 500
 501         BUILD_BUG_ON(sizeof(*di) > sizeof((mi->data)));
 502
 503         spin_lock_irqsave(&priv->tx_lock, flags);
 504         list_add_tail(&di->tx_list, &priv->tx_pending);
 505         spin_unlock_irqrestore(&priv->tx_lock, flags);
 506
 507         queue_work(priv->hw->workqueue, &priv->work);
 508 }
 509
 510 static void p54spi_work(struct work_struct *work)
 511 {
 512         struct p54s_priv *priv = container_of(work, struct p54s_priv, work);
 513         u32 ints;
 514         int ret;
 515
 516         mutex_lock(&priv->mutex);
 517
 518         if (priv->fw_state == FW_STATE_OFF &&
 519             priv->fw_state == FW_STATE_RESET)
 520                 goto out;
 521
 522         ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
 523
 524         if (ints & SPI_HOST_INT_READY) {
 525                 p54spi_int_ready(priv);
 526                 p54spi_int_ack(priv, SPI_HOST_INT_READY);
 527         }
 528
 529         if (priv->fw_state != FW_STATE_READY)
 530                 goto out;
 531
 532         if (ints & SPI_HOST_INT_UPDATE) {
 533                 p54spi_int_ack(priv, SPI_HOST_INT_UPDATE);
 534                 ret = p54spi_rx(priv);
 535                 if (ret < 0)
 536                         goto out;
 537         }
 538         if (ints & SPI_HOST_INT_SW_UPDATE) {
 539                 p54spi_int_ack(priv, SPI_HOST_INT_SW_UPDATE);
 540                 ret = p54spi_rx(priv);
 541                 if (ret < 0)
 542                         goto out;
 543         }
 544
 545         ret = p54spi_wq_tx(priv);
 546         if (ret < 0)
 547                 goto out;
 548
 549         ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
 550
 551 out:
 552         mutex_unlock(&priv->mutex);
 553 }
 554
 555 static int p54spi_op_start(struct ieee80211_hw *dev)
 556 {
 557         struct p54s_priv *priv = dev->priv;
 558         unsigned long timeout;
 559         int ret = 0;
 560
 561         if (mutex_lock_interruptible(&priv->mutex)) {
 562                 ret = -EINTR;
 563                 goto out;
 564         }
 565
 566         priv->fw_state = FW_STATE_BOOTING;
 567
 568         p54spi_power_on(priv);
 569
 570         ret = p54spi_upload_firmware(dev);
 571         if (ret < 0) {
 572                 p54spi_power_off(priv);
 573                 goto out_unlock;
 574         }
 575
 576         mutex_unlock(&priv->mutex);
 577
 578         timeout = msecs_to_jiffies(2000);
 579         timeout = wait_for_completion_interruptible_timeout(&priv->fw_comp,
 580                                                             timeout);
 581         if (!timeout) {
 582                 dev_err(&priv->spi->dev, "firmware boot failed");
 583                 p54spi_power_off(priv);
 584                 ret = -1;
 585                 goto out;
 586         }
 587
 588         if (mutex_lock_interruptible(&priv->mutex)) {
 589                 ret = -EINTR;
 590                 p54spi_power_off(priv);
 591                 goto out;
 592         }
 593
 594         WARN_ON(priv->fw_state != FW_STATE_READY);
 595
 596 out_unlock:
 597         mutex_unlock(&priv->mutex);
 598
 599 out:
 600         return ret;
 601 }
 602
 603 static void p54spi_op_stop(struct ieee80211_hw *dev)
 604 {
 605         struct p54s_priv *priv = dev->priv;
 606         unsigned long flags;
 607
 608         if (mutex_lock_interruptible(&priv->mutex)) {
 609                 /* FIXME: how to handle this error? */
 610                 return;
 611         }
 612
 613         WARN_ON(priv->fw_state != FW_STATE_READY);
 614
 615         cancel_work_sync(&priv->work);
 616
 617         p54spi_power_off(priv);
 618         spin_lock_irqsave(&priv->tx_lock, flags);
 619         INIT_LIST_HEAD(&priv->tx_pending);
 620         spin_unlock_irqrestore(&priv->tx_lock, flags);
 621
 622         priv->fw_state = FW_STATE_OFF;
 623         mutex_unlock(&priv->mutex);
 624 }
 625
 626 static int __devinit p54spi_probe(struct spi_device *spi)
 627 {
 628         struct p54s_priv *priv = NULL;
 629         struct ieee80211_hw *hw;
 630         int ret = -EINVAL;
 631
 632         hw = p54_init_common(sizeof(*priv));
 633         if (!hw) {
 634                 dev_err(&priv->spi->dev, "could not alloc ieee80211_hw");
 635                 return -ENOMEM;
 636         }
 637
 638         priv = hw->priv;
 639         priv->hw = hw;
 640         dev_set_drvdata(&spi->dev, priv);
 641         priv->spi = spi;
 642
 643         spi->bits_per_word = 16;
 644         spi->max_speed_hz = 24000000;
 645
 646         ret = spi_setup(spi);
 647         if (ret < 0) {
 648                 dev_err(&priv->spi->dev, "spi_setup failed");
 649                 goto err_free_common;
 650         }
 651
 652         ret = gpio_request(p54spi_gpio_power, "p54spi power");
 653         if (ret < 0) {
 654                 dev_err(&priv->spi->dev, "power GPIO request failed: %d", ret);
 655                 goto err_free_common;
 656         }
 657
 658         ret = gpio_request(p54spi_gpio_irq, "p54spi irq");
 659         if (ret < 0) {
 660                 dev_err(&priv->spi->dev, "irq GPIO request failed: %d", ret);
 661                 goto err_free_common;
 662         }
 663
 664         gpio_direction_output(p54spi_gpio_power, 0);
 665         gpio_direction_input(p54spi_gpio_irq);
 666
 667         ret = request_irq(gpio_to_irq(p54spi_gpio_irq),
 668                           p54spi_interrupt, IRQF_DISABLED, "p54spi",
 669                           priv->spi);
 670         if (ret < 0) {
 671                 dev_err(&priv->spi->dev, "request_irq() failed");
 672                 goto err_free_common;
 673         }
 674
 675         set_irq_type(gpio_to_irq(p54spi_gpio_irq),
 676                      IRQ_TYPE_EDGE_RISING);
 677
 678         disable_irq(gpio_to_irq(p54spi_gpio_irq));
 679
 680         INIT_WORK(&priv->work, p54spi_work);
 681         init_completion(&priv->fw_comp);
 682         INIT_LIST_HEAD(&priv->tx_pending);
 683         mutex_init(&priv->mutex);
 684         SET_IEEE80211_DEV(hw, &spi->dev);
 685         priv->common.open = p54spi_op_start;
 686         priv->common.stop = p54spi_op_stop;
 687         priv->common.tx = p54spi_op_tx;
 688
 689         ret = p54spi_request_firmware(hw);
 690         if (ret < 0)
 691                 goto err_free_common;
 692
 693         ret = p54spi_request_eeprom(hw);
 694         if (ret)
 695                 goto err_free_common;
 696
 697         ret = p54_register_common(hw, &priv->spi->dev);
 698         if (ret)
 699                 goto err_free_common;
 700
 701         return 0;
 702
 703 err_free_common:
 704         p54_free_common(priv->hw);
 705         return ret;
 706 }
 707
 708 static int __devexit p54spi_remove(struct spi_device *spi)
 709 {
 710         struct p54s_priv *priv = dev_get_drvdata(&spi->dev);
 711
 712         ieee80211_unregister_hw(priv->hw);
 713
 714         free_irq(gpio_to_irq(p54spi_gpio_irq), spi);
 715
 716         gpio_free(p54spi_gpio_power);
 717         gpio_free(p54spi_gpio_irq);
 718         release_firmware(priv->firmware);
 719
 720         mutex_destroy(&priv->mutex);
 721
 722         p54_free_common(priv->hw);
 723         ieee80211_free_hw(priv->hw);
 724
 725         return 0;
 726 }
 727
 728
 729 static struct spi_driver p54spi_driver = {
 730         .driver = {
 731                 /* use cx3110x name because board-n800.c uses that for the
 732                  * SPI port */
 733                 .name           = "cx3110x",
 734                 .bus            = &spi_bus_type,
 735                 .owner          = THIS_MODULE,
 736         },
 737
 738         .probe          = p54spi_probe,
 739         .remove         = __devexit_p(p54spi_remove),
 740 };
 741
 742 static int __init p54spi_init(void)
 743 {
 744         int ret;
 745
 746         ret = spi_register_driver(&p54spi_driver);
 747         if (ret < 0) {
 748                 printk(KERN_ERR "failed to register SPI driver: %d", ret);
 749                 goto out;
 750         }
 751
 752 out:
 753         return ret;
 754 }
 755
 756 static void __exit p54spi_exit(void)
 757 {
 758         spi_unregister_driver(&p54spi_driver);
 759 }
 760
 761 module_init(p54spi_init);
 762 module_exit(p54spi_exit);
 763
 764 MODULE_LICENSE("GPL");
 765 MODULE_AUTHOR("Christian Lamparter <chunkeey@web.de>");