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         __le32 buffer;
 171
 172         for (i = 0; i < 2000; i++) {
 173                 p54spi_spi_read(priv, reg, &buffer, sizeof(buffer));
 174                 if ((buffer & bits) == bits)
 175                         return 1;
 176
 177                 msleep(1);
 178         }
 179         return 0;
 180 }
 181
 182 static int p54spi_request_firmware(struct ieee80211_hw *dev)
 183 {
 184         struct p54s_priv *priv = dev->priv;
 185         int ret;
 186
 187         /* FIXME: should driver use it's own struct device? */
 188         ret = request_firmware(&priv->firmware, "3826.arm", &priv->spi->dev);
 189
 190         if (ret < 0) {
 191                 dev_err(&priv->spi->dev, "request_firmware() failed: %d", ret);
 192                 return ret;
 193         }
 194
 195         ret = p54_parse_firmware(dev, priv->firmware);
 196         if (ret) {
 197                 release_firmware(priv->firmware);
 198                 return ret;
 199         }
 200
 201         return 0;
 202 }
 203
 204 static int p54spi_request_eeprom(struct ieee80211_hw *dev)
 205 {
 206         struct p54s_priv *priv = dev->priv;
 207         const struct firmware *eeprom;
 208         int ret;
 209
 210         /*
 211          * allow users to customize their eeprom.
 212          */
 213
 214         ret = request_firmware(&eeprom, "3826.eeprom", &priv->spi->dev);
 215         if (ret < 0) {
 216                 dev_info(&priv->spi->dev, "loading default eeprom...\n");
 217                 ret = p54_parse_eeprom(dev, (void *) p54spi_eeprom,
 218                                        sizeof(p54spi_eeprom));
 219         } else {
 220                 dev_info(&priv->spi->dev, "loading user eeprom...\n");
 221                 ret = p54_parse_eeprom(dev, (void *) eeprom->data,
 222                                        (int)eeprom->size);
 223                 release_firmware(eeprom);
 224         }
 225         return ret;
 226 }
 227
 228 static int p54spi_upload_firmware(struct ieee80211_hw *dev)
 229 {
 230         struct p54s_priv *priv = dev->priv;
 231         unsigned long fw_len, _fw_len;
 232         unsigned int offset = 0;
 233         int err = 0;
 234         u8 *fw;
 235
 236         fw_len = priv->firmware->size;
 237         fw = kmemdup(priv->firmware->data, fw_len, GFP_KERNEL);
 238         if (!fw)
 239                 return -ENOMEM;
 240
 241         /* stop the device */
 242         p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
 243                        SPI_CTRL_STAT_HOST_OVERRIDE | SPI_CTRL_STAT_HOST_RESET |
 244                        SPI_CTRL_STAT_START_HALTED));
 245
 246         msleep(TARGET_BOOT_SLEEP);
 247
 248         p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
 249                        SPI_CTRL_STAT_HOST_OVERRIDE |
 250                        SPI_CTRL_STAT_START_HALTED));
 251
 252         msleep(TARGET_BOOT_SLEEP);
 253
 254         while (fw_len > 0) {
 255                 _fw_len = min_t(long, fw_len, SPI_MAX_PACKET_SIZE);
 256
 257                 p54spi_write16(priv, SPI_ADRS_DMA_WRITE_CTRL,
 258                                cpu_to_le16(SPI_DMA_WRITE_CTRL_ENABLE));
 259
 260                 if (p54spi_wait_bit(priv, SPI_ADRS_DMA_WRITE_CTRL,
 261                                     cpu_to_le32(HOST_ALLOWED)) == 0) {
 262                         dev_err(&priv->spi->dev, "fw_upload not allowed "
 263                                 "to DMA write.");
 264                         err = -EAGAIN;
 265                         goto out;
 266                 }
 267
 268                 p54spi_write16(priv, SPI_ADRS_DMA_WRITE_LEN,
 269                                cpu_to_le16(_fw_len));
 270                 p54spi_write32(priv, SPI_ADRS_DMA_WRITE_BASE, cpu_to_le32(
 271                                 ISL38XX_DEV_FIRMWARE_ADDR + offset));
 272
 273                 p54spi_spi_write(priv, SPI_ADRS_DMA_DATA,
 274                                  (fw + offset), _fw_len);
 275
 276                 fw_len -= _fw_len;
 277                 offset += _fw_len;
 278         }
 279
 280         BUG_ON(fw_len != 0);
 281
 282         /* enable host interrupts */
 283         p54spi_write32(priv, SPI_ADRS_HOST_INT_EN,
 284                        cpu_to_le32(SPI_HOST_INTS_DEFAULT));
 285
 286         /* boot the device */
 287         p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
 288                        SPI_CTRL_STAT_HOST_OVERRIDE | SPI_CTRL_STAT_HOST_RESET |
 289                        SPI_CTRL_STAT_RAM_BOOT));
 290
 291         msleep(TARGET_BOOT_SLEEP);
 292
 293         p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
 294                        SPI_CTRL_STAT_HOST_OVERRIDE | SPI_CTRL_STAT_RAM_BOOT));
 295         msleep(TARGET_BOOT_SLEEP);
 296
 297 out:
 298         kfree(fw);
 299         return err;
 300 }
 301
 302 static void p54spi_power_off(struct p54s_priv *priv)
 303 {
 304         disable_irq(gpio_to_irq(p54spi_gpio_irq));
 305         gpio_set_value(p54spi_gpio_power, 0);
 306 }
 307
 308 static void p54spi_power_on(struct p54s_priv *priv)
 309 {
 310         gpio_set_value(p54spi_gpio_power, 1);
 311         enable_irq(gpio_to_irq(p54spi_gpio_irq));
 312
 313         /*
 314          * need to wait a while before device can be accessed, the lenght
 315          * is just a guess
 316          */
 317         msleep(10);
 318 }
 319
 320 static inline void p54spi_int_ack(struct p54s_priv *priv, u32 val)
 321 {
 322         p54spi_write32(priv, SPI_ADRS_HOST_INT_ACK, cpu_to_le32(val));
 323 }
 324
 325 static void p54spi_wakeup(struct p54s_priv *priv)
 326 {
 327         unsigned long timeout;
 328         u32 ints;
 329
 330         /* wake the chip */
 331         p54spi_write32(priv, SPI_ADRS_ARM_INTERRUPTS,
 332                        cpu_to_le32(SPI_TARGET_INT_WAKEUP));
 333
 334         /* And wait for the READY interrupt */
 335         timeout = jiffies + HZ;
 336
 337         ints =  p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
 338         while (!(ints & SPI_HOST_INT_READY)) {
 339                 if (time_after(jiffies, timeout))
 340                                 goto out;
 341                 ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
 342         }
 343
 344         p54spi_int_ack(priv, SPI_HOST_INT_READY);
 345
 346 out:
 347         return;
 348 }
 349
 350 static inline void p54spi_sleep(struct p54s_priv *priv)
 351 {
 352         p54spi_write32(priv, SPI_ADRS_ARM_INTERRUPTS,
 353                        cpu_to_le32(SPI_TARGET_INT_SLEEP));
 354 }
 355
 356 static void p54spi_int_ready(struct p54s_priv *priv)
 357 {
 358         p54spi_write32(priv, SPI_ADRS_HOST_INT_EN, cpu_to_le32(
 359                        SPI_HOST_INT_UPDATE | SPI_HOST_INT_SW_UPDATE));
 360
 361         switch (priv->fw_state) {
 362         case FW_STATE_BOOTING:
 363                 priv->fw_state = FW_STATE_READY;
 364                 complete(&priv->fw_comp);
 365                 break;
 366         case FW_STATE_RESETTING:
 367                 priv->fw_state = FW_STATE_READY;
 368                 /* TODO: reinitialize state */
 369                 break;
 370         default:
 371                 break;
 372         }
 373 }
 374
 375 static int p54spi_rx(struct p54s_priv *priv)
 376 {
 377         struct sk_buff *skb;
 378         u16 len;
 379
 380         p54spi_wakeup(priv);
 381
 382         /* dummy read to flush SPI DMA controller bug */
 383         p54spi_read16(priv, SPI_ADRS_GEN_PURP_1);
 384
 385         len = p54spi_read16(priv, SPI_ADRS_DMA_DATA);
 386
 387         if (len == 0) {
 388                 dev_err(&priv->spi->dev, "rx request of zero bytes");
 389                 return 0;
 390         }
 391
 392         skb = dev_alloc_skb(len);
 393         if (!skb) {
 394                 dev_err(&priv->spi->dev, "could not alloc skb");
 395                 return 0;
 396         }
 397
 398         p54spi_spi_read(priv, SPI_ADRS_DMA_DATA, skb_put(skb, len), len);
 399         p54spi_sleep(priv);
 400
 401         if (p54_rx(priv->hw, skb) == 0)
 402                 dev_kfree_skb(skb);
 403
 404         return 0;
 405 }
 406
 407
 408 static irqreturn_t p54spi_interrupt(int irq, void *config)
 409 {
 410         struct spi_device *spi = config;
 411         struct p54s_priv *priv = dev_get_drvdata(&spi->dev);
 412
 413         queue_work(priv->hw->workqueue, &priv->work);
 414
 415         return IRQ_HANDLED;
 416 }
 417
 418 static int p54spi_tx_frame(struct p54s_priv *priv, struct sk_buff *skb)
 419 {
 420         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 421         struct p54s_dma_regs dma_regs;
 422         unsigned long timeout;
 423         int ret = 0;
 424         u32 ints;
 425
 426         p54spi_wakeup(priv);
 427
 428         dma_regs.cmd = cpu_to_le16(SPI_DMA_WRITE_CTRL_ENABLE);
 429         dma_regs.len = cpu_to_le16(skb->len);
 430         dma_regs.addr = hdr->req_id;
 431
 432         p54spi_spi_write(priv, SPI_ADRS_DMA_WRITE_CTRL, &dma_regs,
 433                            sizeof(dma_regs));
 434
 435         p54spi_spi_write(priv, SPI_ADRS_DMA_DATA, skb->data, skb->len);
 436
 437         timeout = jiffies + 2 * HZ;
 438         ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
 439         while (!(ints & SPI_HOST_INT_WR_READY)) {
 440                 if (time_after(jiffies, timeout)) {
 441                         dev_err(&priv->spi->dev, "WR_READY timeout");
 442                         ret = -1;
 443                         goto out;
 444                 }
 445                 ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
 446         }
 447
 448         p54spi_int_ack(priv, SPI_HOST_INT_WR_READY);
 449         p54spi_sleep(priv);
 450
 451 out:
 452         if (FREE_AFTER_TX(skb))
 453                 p54_free_skb(priv->hw, skb);
 454         return ret;
 455 }
 456
 457 static int p54spi_wq_tx(struct p54s_priv *priv)
 458 {
 459         struct p54s_tx_info *entry;
 460         struct sk_buff *skb;
 461         struct ieee80211_tx_info *info;
 462         struct p54_tx_info *minfo;
 463         struct p54s_tx_info *dinfo;
 464         unsigned long flags;
 465         int ret = 0;
 466
 467         spin_lock_irqsave(&priv->tx_lock, flags);
 468
 469         while (!list_empty(&priv->tx_pending)) {
 470                 entry = list_entry(priv->tx_pending.next,
 471                                    struct p54s_tx_info, tx_list);
 472
 473                 list_del_init(&entry->tx_list);
 474
 475                 spin_unlock_irqrestore(&priv->tx_lock, flags);
 476
 477                 dinfo = container_of((void *) entry, struct p54s_tx_info,
 478                                      tx_list);
 479                 minfo = container_of((void *) dinfo, struct p54_tx_info,
 480                                      data);
 481                 info = container_of((void *) minfo, struct ieee80211_tx_info,
 482                                     rate_driver_data);
 483                 skb = container_of((void *) info, struct sk_buff, cb);
 484
 485                 ret = p54spi_tx_frame(priv, skb);
 486
 487                 if (ret < 0) {
 488                         p54_free_skb(priv->hw, skb);
 489                         return ret;
 490                 }
 491
 492                 spin_lock_irqsave(&priv->tx_lock, flags);
 493         }
 494         spin_unlock_irqrestore(&priv->tx_lock, flags);
 495         return ret;
 496 }
 497
 498 static void p54spi_op_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
 499 {
 500         struct p54s_priv *priv = dev->priv;
 501         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 502         struct p54_tx_info *mi = (struct p54_tx_info *) info->rate_driver_data;
 503         struct p54s_tx_info *di = (struct p54s_tx_info *) mi->data;
 504         unsigned long flags;
 505
 506         BUILD_BUG_ON(sizeof(*di) > sizeof((mi->data)));
 507
 508         spin_lock_irqsave(&priv->tx_lock, flags);
 509         list_add_tail(&di->tx_list, &priv->tx_pending);
 510         spin_unlock_irqrestore(&priv->tx_lock, flags);
 511
 512         queue_work(priv->hw->workqueue, &priv->work);
 513 }
 514
 515 static void p54spi_work(struct work_struct *work)
 516 {
 517         struct p54s_priv *priv = container_of(work, struct p54s_priv, work);
 518         u32 ints;
 519         int ret;
 520
 521         mutex_lock(&priv->mutex);
 522
 523         if (priv->fw_state == FW_STATE_OFF &&
 524             priv->fw_state == FW_STATE_RESET)
 525                 goto out;
 526
 527         ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
 528
 529         if (ints & SPI_HOST_INT_READY) {
 530                 p54spi_int_ready(priv);
 531                 p54spi_int_ack(priv, SPI_HOST_INT_READY);
 532         }
 533
 534         if (priv->fw_state != FW_STATE_READY)
 535                 goto out;
 536
 537         if (ints & SPI_HOST_INT_UPDATE) {
 538                 p54spi_int_ack(priv, SPI_HOST_INT_UPDATE);
 539                 ret = p54spi_rx(priv);
 540                 if (ret < 0)
 541                         goto out;
 542         }
 543         if (ints & SPI_HOST_INT_SW_UPDATE) {
 544                 p54spi_int_ack(priv, SPI_HOST_INT_SW_UPDATE);
 545                 ret = p54spi_rx(priv);
 546                 if (ret < 0)
 547                         goto out;
 548         }
 549
 550         ret = p54spi_wq_tx(priv);
 551         if (ret < 0)
 552                 goto out;
 553
 554         ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
 555
 556 out:
 557         mutex_unlock(&priv->mutex);
 558 }
 559
 560 static int p54spi_op_start(struct ieee80211_hw *dev)
 561 {
 562         struct p54s_priv *priv = dev->priv;
 563         unsigned long timeout;
 564         int ret = 0;
 565
 566         if (mutex_lock_interruptible(&priv->mutex)) {
 567                 ret = -EINTR;
 568                 goto out;
 569         }
 570
 571         priv->fw_state = FW_STATE_BOOTING;
 572
 573         p54spi_power_on(priv);
 574
 575         ret = p54spi_upload_firmware(dev);
 576         if (ret < 0) {
 577                 p54spi_power_off(priv);
 578                 goto out_unlock;
 579         }
 580
 581         mutex_unlock(&priv->mutex);
 582
 583         timeout = msecs_to_jiffies(2000);
 584         timeout = wait_for_completion_interruptible_timeout(&priv->fw_comp,
 585                                                             timeout);
 586         if (!timeout) {
 587                 dev_err(&priv->spi->dev, "firmware boot failed");
 588                 p54spi_power_off(priv);
 589                 ret = -1;
 590                 goto out;
 591         }
 592
 593         if (mutex_lock_interruptible(&priv->mutex)) {
 594                 ret = -EINTR;
 595                 p54spi_power_off(priv);
 596                 goto out;
 597         }
 598
 599         WARN_ON(priv->fw_state != FW_STATE_READY);
 600
 601 out_unlock:
 602         mutex_unlock(&priv->mutex);
 603
 604 out:
 605         return ret;
 606 }
 607
 608 static void p54spi_op_stop(struct ieee80211_hw *dev)
 609 {
 610         struct p54s_priv *priv = dev->priv;
 611         unsigned long flags;
 612
 613         if (mutex_lock_interruptible(&priv->mutex)) {
 614                 /* FIXME: how to handle this error? */
 615                 return;
 616         }
 617
 618         WARN_ON(priv->fw_state != FW_STATE_READY);
 619
 620         cancel_work_sync(&priv->work);
 621
 622         p54spi_power_off(priv);
 623         spin_lock_irqsave(&priv->tx_lock, flags);
 624         INIT_LIST_HEAD(&priv->tx_pending);
 625         spin_unlock_irqrestore(&priv->tx_lock, flags);
 626
 627         priv->fw_state = FW_STATE_OFF;
 628         mutex_unlock(&priv->mutex);
 629 }
 630
 631 static int __devinit p54spi_probe(struct spi_device *spi)
 632 {
 633         struct p54s_priv *priv = NULL;
 634         struct ieee80211_hw *hw;
 635         int ret = -EINVAL;
 636
 637         hw = p54_init_common(sizeof(*priv));
 638         if (!hw) {
 639                 dev_err(&priv->spi->dev, "could not alloc ieee80211_hw");
 640                 return -ENOMEM;
 641         }
 642
 643         priv = hw->priv;
 644         priv->hw = hw;
 645         dev_set_drvdata(&spi->dev, priv);
 646         priv->spi = spi;
 647
 648         spi->bits_per_word = 16;
 649         spi->max_speed_hz = 24000000;
 650
 651         ret = spi_setup(spi);
 652         if (ret < 0) {
 653                 dev_err(&priv->spi->dev, "spi_setup failed");
 654                 goto err_free_common;
 655         }
 656
 657         ret = gpio_request(p54spi_gpio_power, "p54spi power");
 658         if (ret < 0) {
 659                 dev_err(&priv->spi->dev, "power GPIO request failed: %d", ret);
 660                 goto err_free_common;
 661         }
 662
 663         ret = gpio_request(p54spi_gpio_irq, "p54spi irq");
 664         if (ret < 0) {
 665                 dev_err(&priv->spi->dev, "irq GPIO request failed: %d", ret);
 666                 goto err_free_common;
 667         }
 668
 669         gpio_direction_output(p54spi_gpio_power, 0);
 670         gpio_direction_input(p54spi_gpio_irq);
 671
 672         ret = request_irq(gpio_to_irq(p54spi_gpio_irq),
 673                           p54spi_interrupt, IRQF_DISABLED, "p54spi",
 674                           priv->spi);
 675         if (ret < 0) {
 676                 dev_err(&priv->spi->dev, "request_irq() failed");
 677                 goto err_free_common;
 678         }
 679
 680         set_irq_type(gpio_to_irq(p54spi_gpio_irq),
 681                      IRQ_TYPE_EDGE_RISING);
 682
 683         disable_irq(gpio_to_irq(p54spi_gpio_irq));
 684
 685         INIT_WORK(&priv->work, p54spi_work);
 686         init_completion(&priv->fw_comp);
 687         INIT_LIST_HEAD(&priv->tx_pending);
 688         mutex_init(&priv->mutex);
 689         SET_IEEE80211_DEV(hw, &spi->dev);
 690         priv->common.open = p54spi_op_start;
 691         priv->common.stop = p54spi_op_stop;
 692         priv->common.tx = p54spi_op_tx;
 693
 694         ret = p54spi_request_firmware(hw);
 695         if (ret < 0)
 696                 goto err_free_common;
 697
 698         ret = p54spi_request_eeprom(hw);
 699         if (ret)
 700                 goto err_free_common;
 701
 702         ret = p54_register_common(hw, &priv->spi->dev);
 703         if (ret)
 704                 goto err_free_common;
 705
 706         return 0;
 707
 708 err_free_common:
 709         p54_free_common(priv->hw);
 710         return ret;
 711 }
 712
 713 static int __devexit p54spi_remove(struct spi_device *spi)
 714 {
 715         struct p54s_priv *priv = dev_get_drvdata(&spi->dev);
 716
 717         ieee80211_unregister_hw(priv->hw);
 718
 719         free_irq(gpio_to_irq(p54spi_gpio_irq), spi);
 720
 721         gpio_free(p54spi_gpio_power);
 722         gpio_free(p54spi_gpio_irq);
 723         release_firmware(priv->firmware);
 724
 725         mutex_destroy(&priv->mutex);
 726
 727         p54_free_common(priv->hw);
 728         ieee80211_free_hw(priv->hw);
 729
 730         return 0;
 731 }
 732
 733
 734 static struct spi_driver p54spi_driver = {
 735         .driver = {
 736                 /* use cx3110x name because board-n800.c uses that for the
 737                  * SPI port */
 738                 .name           = "cx3110x",
 739                 .bus            = &spi_bus_type,
 740                 .owner          = THIS_MODULE,
 741         },
 742
 743         .probe          = p54spi_probe,
 744         .remove         = __devexit_p(p54spi_remove),
 745 };
 746
 747 static int __init p54spi_init(void)
 748 {
 749         int ret;
 750
 751         ret = spi_register_driver(&p54spi_driver);
 752         if (ret < 0) {
 753                 printk(KERN_ERR "failed to register SPI driver: %d", ret);
 754                 goto out;
 755         }
 756
 757 out:
 758         return ret;
 759 }
 760
 761 static void __exit p54spi_exit(void)
 762 {
 763         spi_unregister_driver(&p54spi_driver);
 764 }
 765
 766 module_init(p54spi_init);
 767 module_exit(p54spi_exit);
 768
 769 MODULE_LICENSE("GPL");
 770 MODULE_AUTHOR("Christian Lamparter <chunkeey@web.de>");