Pileus Git - ~andy/linux/blob - drivers/tty/serial/ifx6x60.c

   1 /****************************************************************************
   2  *
   3  * Driver for the IFX 6x60 spi modem.
   4  *
   5  * Copyright (C) 2008 Option International
   6  * Copyright (C) 2008 Filip Aben <f.aben@option.com>
   7  *                    Denis Joseph Barrow <d.barow@option.com>
   8  *                    Jan Dumon <j.dumon@option.com>
   9  *
  10  * Copyright (C) 2009, 2010 Intel Corp
  11  * Russ Gorby <russ.gorby@intel.com>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
  25  * USA
  26  *
  27  * Driver modified by Intel from Option gtm501l_spi.c
  28  *
  29  * Notes
  30  * o    The driver currently assumes a single device only. If you need to
  31  *      change this then look for saved_ifx_dev and add a device lookup
  32  * o    The driver is intended to be big-endian safe but has never been
  33  *      tested that way (no suitable hardware). There are a couple of FIXME
  34  *      notes by areas that may need addressing
  35  * o    Some of the GPIO naming/setup assumptions may need revisiting if
  36  *      you need to use this driver for another platform.
  37  *
  38  *****************************************************************************/
  39 #include <linux/module.h>
  40 #include <linux/termios.h>
  41 #include <linux/tty.h>
  42 #include <linux/device.h>
  43 #include <linux/spi/spi.h>
  44 #include <linux/kfifo.h>
  45 #include <linux/tty_flip.h>
  46 #include <linux/timer.h>
  47 #include <linux/serial.h>
  48 #include <linux/interrupt.h>
  49 #include <linux/irq.h>
  50 #include <linux/rfkill.h>
  51 #include <linux/fs.h>
  52 #include <linux/ip.h>
  53 #include <linux/dmapool.h>
  54 #include <linux/gpio.h>
  55 #include <linux/sched.h>
  56 #include <linux/time.h>
  57 #include <linux/wait.h>
  58 #include <linux/pm.h>
  59 #include <linux/pm_runtime.h>
  60 #include <linux/spi/ifx_modem.h>
  61 #include <linux/delay.h>
  62
  63 #include "ifx6x60.h"
  64
  65 #define IFX_SPI_MORE_MASK               0x10
  66 #define IFX_SPI_MORE_BIT                12      /* bit position in u16 */
  67 #define IFX_SPI_CTS_BIT                 13      /* bit position in u16 */
  68 #define IFX_SPI_MODE                    SPI_MODE_1
  69 #define IFX_SPI_TTY_ID                  0
  70 #define IFX_SPI_TIMEOUT_SEC             2
  71 #define IFX_SPI_HEADER_0                (-1)
  72 #define IFX_SPI_HEADER_F                (-2)
  73
  74 /* forward reference */
  75 static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev);
  76
  77 /* local variables */
  78 static int spi_bpw = 16;                /* 8, 16 or 32 bit word length */
  79 static struct tty_driver *tty_drv;
  80 static struct ifx_spi_device *saved_ifx_dev;
  81 static struct lock_class_key ifx_spi_key;
  82
  83 /* GPIO/GPE settings */
  84
  85 /**
  86  *      mrdy_set_high           -       set MRDY GPIO
  87  *      @ifx: device we are controlling
  88  *
  89  */
  90 static inline void mrdy_set_high(struct ifx_spi_device *ifx)
  91 {
  92         gpio_set_value(ifx->gpio.mrdy, 1);
  93 }
  94
  95 /**
  96  *      mrdy_set_low            -       clear MRDY GPIO
  97  *      @ifx: device we are controlling
  98  *
  99  */
 100 static inline void mrdy_set_low(struct ifx_spi_device *ifx)
 101 {
 102         gpio_set_value(ifx->gpio.mrdy, 0);
 103 }
 104
 105 /**
 106  *      ifx_spi_power_state_set
 107  *      @ifx_dev: our SPI device
 108  *      @val: bits to set
 109  *
 110  *      Set bit in power status and signal power system if status becomes non-0
 111  */
 112 static void
 113 ifx_spi_power_state_set(struct ifx_spi_device *ifx_dev, unsigned char val)
 114 {
 115         unsigned long flags;
 116
 117         spin_lock_irqsave(&ifx_dev->power_lock, flags);
 118
 119         /*
 120          * if power status is already non-0, just update, else
 121          * tell power system
 122          */
 123         if (!ifx_dev->power_status)
 124                 pm_runtime_get(&ifx_dev->spi_dev->dev);
 125         ifx_dev->power_status |= val;
 126
 127         spin_unlock_irqrestore(&ifx_dev->power_lock, flags);
 128 }
 129
 130 /**
 131  *      ifx_spi_power_state_clear       -       clear power bit
 132  *      @ifx_dev: our SPI device
 133  *      @val: bits to clear
 134  *
 135  *      clear bit in power status and signal power system if status becomes 0
 136  */
 137 static void
 138 ifx_spi_power_state_clear(struct ifx_spi_device *ifx_dev, unsigned char val)
 139 {
 140         unsigned long flags;
 141
 142         spin_lock_irqsave(&ifx_dev->power_lock, flags);
 143
 144         if (ifx_dev->power_status) {
 145                 ifx_dev->power_status &= ~val;
 146                 if (!ifx_dev->power_status)
 147                         pm_runtime_put(&ifx_dev->spi_dev->dev);
 148         }
 149
 150         spin_unlock_irqrestore(&ifx_dev->power_lock, flags);
 151 }
 152
 153 /**
 154  *      swap_buf
 155  *      @buf: our buffer
 156  *      @len : number of bytes (not words) in the buffer
 157  *      @end: end of buffer
 158  *
 159  *      Swap the contents of a buffer into big endian format
 160  */
 161 static inline void swap_buf(u16 *buf, int len, void *end)
 162 {
 163         int n;
 164
 165         len = ((len + 1) >> 1);
 166         if ((void *)&buf[len] > end) {
 167                 pr_err("swap_buf: swap exceeds boundary (%p > %p)!",
 168                        &buf[len], end);
 169                 return;
 170         }
 171         for (n = 0; n < len; n++) {
 172                 *buf = cpu_to_be16(*buf);
 173                 buf++;
 174         }
 175 }
 176
 177 /**
 178  *      mrdy_assert             -       assert MRDY line
 179  *      @ifx_dev: our SPI device
 180  *
 181  *      Assert mrdy and set timer to wait for SRDY interrupt, if SRDY is low
 182  *      now.
 183  *
 184  *      FIXME: Can SRDY even go high as we are running this code ?
 185  */
 186 static void mrdy_assert(struct ifx_spi_device *ifx_dev)
 187 {
 188         int val = gpio_get_value(ifx_dev->gpio.srdy);
 189         if (!val) {
 190                 if (!test_and_set_bit(IFX_SPI_STATE_TIMER_PENDING,
 191                                       &ifx_dev->flags)) {
 192                         ifx_dev->spi_timer.expires =
 193                                 jiffies + IFX_SPI_TIMEOUT_SEC*HZ;
 194                         add_timer(&ifx_dev->spi_timer);
 195
 196                 }
 197         }
 198         ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_DATA_PENDING);
 199         mrdy_set_high(ifx_dev);
 200 }
 201
 202 /**
 203  *      ifx_spi_hangup          -       hang up an IFX device
 204  *      @ifx_dev: our SPI device
 205  *
 206  *      Hang up the tty attached to the IFX device if one is currently
 207  *      open. If not take no action
 208  */
 209 static void ifx_spi_ttyhangup(struct ifx_spi_device *ifx_dev)
 210 {
 211         struct tty_port *pport = &ifx_dev->tty_port;
 212         struct tty_struct *tty = tty_port_tty_get(pport);
 213         if (tty) {
 214                 tty_hangup(tty);
 215                 tty_kref_put(tty);
 216         }
 217 }
 218
 219 /**
 220  *      ifx_spi_timeout         -       SPI timeout
 221  *      @arg: our SPI device
 222  *
 223  *      The SPI has timed out: hang up the tty. Users will then see a hangup
 224  *      and error events.
 225  */
 226 static void ifx_spi_timeout(unsigned long arg)
 227 {
 228         struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *)arg;
 229
 230         dev_warn(&ifx_dev->spi_dev->dev, "*** SPI Timeout ***");
 231         ifx_spi_ttyhangup(ifx_dev);
 232         mrdy_set_low(ifx_dev);
 233         clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
 234 }
 235
 236 /* char/tty operations */
 237
 238 /**
 239  *      ifx_spi_tiocmget        -       get modem lines
 240  *      @tty: our tty device
 241  *      @filp: file handle issuing the request
 242  *
 243  *      Map the signal state into Linux modem flags and report the value
 244  *      in Linux terms
 245  */
 246 static int ifx_spi_tiocmget(struct tty_struct *tty)
 247 {
 248         unsigned int value;
 249         struct ifx_spi_device *ifx_dev = tty->driver_data;
 250
 251         value =
 252         (test_bit(IFX_SPI_RTS, &ifx_dev->signal_state) ? TIOCM_RTS : 0) |
 253         (test_bit(IFX_SPI_DTR, &ifx_dev->signal_state) ? TIOCM_DTR : 0) |
 254         (test_bit(IFX_SPI_CTS, &ifx_dev->signal_state) ? TIOCM_CTS : 0) |
 255         (test_bit(IFX_SPI_DSR, &ifx_dev->signal_state) ? TIOCM_DSR : 0) |
 256         (test_bit(IFX_SPI_DCD, &ifx_dev->signal_state) ? TIOCM_CAR : 0) |
 257         (test_bit(IFX_SPI_RI, &ifx_dev->signal_state) ? TIOCM_RNG : 0);
 258         return value;
 259 }
 260
 261 /**
 262  *      ifx_spi_tiocmset        -       set modem bits
 263  *      @tty: the tty structure
 264  *      @set: bits to set
 265  *      @clear: bits to clear
 266  *
 267  *      The IFX6x60 only supports DTR and RTS. Set them accordingly
 268  *      and flag that an update to the modem is needed.
 269  *
 270  *      FIXME: do we need to kick the tranfers when we do this ?
 271  */
 272 static int ifx_spi_tiocmset(struct tty_struct *tty,
 273                             unsigned int set, unsigned int clear)
 274 {
 275         struct ifx_spi_device *ifx_dev = tty->driver_data;
 276
 277         if (set & TIOCM_RTS)
 278                 set_bit(IFX_SPI_RTS, &ifx_dev->signal_state);
 279         if (set & TIOCM_DTR)
 280                 set_bit(IFX_SPI_DTR, &ifx_dev->signal_state);
 281         if (clear & TIOCM_RTS)
 282                 clear_bit(IFX_SPI_RTS, &ifx_dev->signal_state);
 283         if (clear & TIOCM_DTR)
 284                 clear_bit(IFX_SPI_DTR, &ifx_dev->signal_state);
 285
 286         set_bit(IFX_SPI_UPDATE, &ifx_dev->signal_state);
 287         return 0;
 288 }
 289
 290 /**
 291  *      ifx_spi_open    -       called on tty open
 292  *      @tty: our tty device
 293  *      @filp: file handle being associated with the tty
 294  *
 295  *      Open the tty interface. We let the tty_port layer do all the work
 296  *      for us.
 297  *
 298  *      FIXME: Remove single device assumption and saved_ifx_dev
 299  */
 300 static int ifx_spi_open(struct tty_struct *tty, struct file *filp)
 301 {
 302         return tty_port_open(&saved_ifx_dev->tty_port, tty, filp);
 303 }
 304
 305 /**
 306  *      ifx_spi_close   -       called when our tty closes
 307  *      @tty: the tty being closed
 308  *      @filp: the file handle being closed
 309  *
 310  *      Perform the close of the tty. We use the tty_port layer to do all
 311  *      our hard work.
 312  */
 313 static void ifx_spi_close(struct tty_struct *tty, struct file *filp)
 314 {
 315         struct ifx_spi_device *ifx_dev = tty->driver_data;
 316         tty_port_close(&ifx_dev->tty_port, tty, filp);
 317         /* FIXME: should we do an ifx_spi_reset here ? */
 318 }
 319
 320 /**
 321  *      ifx_decode_spi_header   -       decode received header
 322  *      @buffer: the received data
 323  *      @length: decoded length
 324  *      @more: decoded more flag
 325  *      @received_cts: status of cts we received
 326  *
 327  *      Note how received_cts is handled -- if header is all F it is left
 328  *      the same as it was, if header is all 0 it is set to 0 otherwise it is
 329  *      taken from the incoming header.
 330  *
 331  *      FIXME: endianness
 332  */
 333 static int ifx_spi_decode_spi_header(unsigned char *buffer, int *length,
 334                         unsigned char *more, unsigned char *received_cts)
 335 {
 336         u16 h1;
 337         u16 h2;
 338         u16 *in_buffer = (u16 *)buffer;
 339
 340         h1 = *in_buffer;
 341         h2 = *(in_buffer+1);
 342
 343         if (h1 == 0 && h2 == 0) {
 344                 *received_cts = 0;
 345                 return IFX_SPI_HEADER_0;
 346         } else if (h1 == 0xffff && h2 == 0xffff) {
 347                 /* spi_slave_cts remains as it was */
 348                 return IFX_SPI_HEADER_F;
 349         }
 350
 351         *length = h1 & 0xfff;   /* upper bits of byte are flags */
 352         *more = (buffer[1] >> IFX_SPI_MORE_BIT) & 1;
 353         *received_cts = (buffer[3] >> IFX_SPI_CTS_BIT) & 1;
 354         return 0;
 355 }
 356
 357 /**
 358  *      ifx_setup_spi_header    -       set header fields
 359  *      @txbuffer: pointer to start of SPI buffer
 360  *      @tx_count: bytes
 361  *      @more: indicate if more to follow
 362  *
 363  *      Format up an SPI header for a transfer
 364  *
 365  *      FIXME: endianness?
 366  */
 367 static void ifx_spi_setup_spi_header(unsigned char *txbuffer, int tx_count,
 368                                         unsigned char more)
 369 {
 370         *(u16 *)(txbuffer) = tx_count;
 371         *(u16 *)(txbuffer+2) = IFX_SPI_PAYLOAD_SIZE;
 372         txbuffer[1] |= (more << IFX_SPI_MORE_BIT) & IFX_SPI_MORE_MASK;
 373 }
 374
 375 /**
 376  *      ifx_spi_wakeup_serial   -       SPI space made
 377  *      @port_data: our SPI device
 378  *
 379  *      We have emptied the FIFO enough that we want to get more data
 380  *      queued into it. Poke the line discipline via tty_wakeup so that
 381  *      it will feed us more bits
 382  */
 383 static void ifx_spi_wakeup_serial(struct ifx_spi_device *ifx_dev)
 384 {
 385         struct tty_struct *tty;
 386
 387         tty = tty_port_tty_get(&ifx_dev->tty_port);
 388         if (!tty)
 389                 return;
 390         tty_wakeup(tty);
 391         tty_kref_put(tty);
 392 }
 393
 394 /**
 395  *      ifx_spi_prepare_tx_buffer       -       prepare transmit frame
 396  *      @ifx_dev: our SPI device
 397  *
 398  *      The transmit buffr needs a header and various other bits of
 399  *      information followed by as much data as we can pull from the FIFO
 400  *      and transfer. This function formats up a suitable buffer in the
 401  *      ifx_dev->tx_buffer
 402  *
 403  *      FIXME: performance - should we wake the tty when the queue is half
 404  *                           empty ?
 405  */
 406 static int ifx_spi_prepare_tx_buffer(struct ifx_spi_device *ifx_dev)
 407 {
 408         int temp_count;
 409         int queue_length;
 410         int tx_count;
 411         unsigned char *tx_buffer;
 412
 413         tx_buffer = ifx_dev->tx_buffer;
 414         memset(tx_buffer, 0, IFX_SPI_TRANSFER_SIZE);
 415
 416         /* make room for required SPI header */
 417         tx_buffer += IFX_SPI_HEADER_OVERHEAD;
 418         tx_count = IFX_SPI_HEADER_OVERHEAD;
 419
 420         /* clear to signal no more data if this turns out to be the
 421          * last buffer sent in a sequence */
 422         ifx_dev->spi_more = 0;
 423
 424         /* if modem cts is set, just send empty buffer */
 425         if (!ifx_dev->spi_slave_cts) {
 426                 /* see if there's tx data */
 427                 queue_length = kfifo_len(&ifx_dev->tx_fifo);
 428                 if (queue_length != 0) {
 429                         /* data to mux -- see if there's room for it */
 430                         temp_count = min(queue_length, IFX_SPI_PAYLOAD_SIZE);
 431                         temp_count = kfifo_out_locked(&ifx_dev->tx_fifo,
 432                                         tx_buffer, temp_count,
 433                                         &ifx_dev->fifo_lock);
 434
 435                         /* update buffer pointer and data count in message */
 436                         tx_buffer += temp_count;
 437                         tx_count += temp_count;
 438                         if (temp_count == queue_length)
 439                                 /* poke port to get more data */
 440                                 ifx_spi_wakeup_serial(ifx_dev);
 441                         else /* more data in port, use next SPI message */
 442                                 ifx_dev->spi_more = 1;
 443                 }
 444         }
 445         /* have data and info for header -- set up SPI header in buffer */
 446         /* spi header needs payload size, not entire buffer size */
 447         ifx_spi_setup_spi_header(ifx_dev->tx_buffer,
 448                                         tx_count-IFX_SPI_HEADER_OVERHEAD,
 449                                         ifx_dev->spi_more);
 450         /* swap actual data in the buffer */
 451         swap_buf((u16 *)(ifx_dev->tx_buffer), tx_count,
 452                 &ifx_dev->tx_buffer[IFX_SPI_TRANSFER_SIZE]);
 453         return tx_count;
 454 }
 455
 456 /**
 457  *      ifx_spi_write           -       line discipline write
 458  *      @tty: our tty device
 459  *      @buf: pointer to buffer to write (kernel space)
 460  *      @count: size of buffer
 461  *
 462  *      Write the characters we have been given into the FIFO. If the device
 463  *      is not active then activate it, when the SRDY line is asserted back
 464  *      this will commence I/O
 465  */
 466 static int ifx_spi_write(struct tty_struct *tty, const unsigned char *buf,
 467                          int count)
 468 {
 469         struct ifx_spi_device *ifx_dev = tty->driver_data;
 470         unsigned char *tmp_buf = (unsigned char *)buf;
 471         int tx_count = kfifo_in_locked(&ifx_dev->tx_fifo, tmp_buf, count,
 472                                    &ifx_dev->fifo_lock);
 473         mrdy_assert(ifx_dev);
 474         return tx_count;
 475 }
 476
 477 /**
 478  *      ifx_spi_chars_in_buffer -       line discipline helper
 479  *      @tty: our tty device
 480  *
 481  *      Report how much data we can accept before we drop bytes. As we use
 482  *      a simple FIFO this is nice and easy.
 483  */
 484 static int ifx_spi_write_room(struct tty_struct *tty)
 485 {
 486         struct ifx_spi_device *ifx_dev = tty->driver_data;
 487         return IFX_SPI_FIFO_SIZE - kfifo_len(&ifx_dev->tx_fifo);
 488 }
 489
 490 /**
 491  *      ifx_spi_chars_in_buffer -       line discipline helper
 492  *      @tty: our tty device
 493  *
 494  *      Report how many characters we have buffered. In our case this is the
 495  *      number of bytes sitting in our transmit FIFO.
 496  */
 497 static int ifx_spi_chars_in_buffer(struct tty_struct *tty)
 498 {
 499         struct ifx_spi_device *ifx_dev = tty->driver_data;
 500         return kfifo_len(&ifx_dev->tx_fifo);
 501 }
 502
 503 /**
 504  *      ifx_port_hangup
 505  *      @port: our tty port
 506  *
 507  *      tty port hang up. Called when tty_hangup processing is invoked either
 508  *      by loss of carrier, or by software (eg vhangup). Serialized against
 509  *      activate/shutdown by the tty layer.
 510  */
 511 static void ifx_spi_hangup(struct tty_struct *tty)
 512 {
 513         struct ifx_spi_device *ifx_dev = tty->driver_data;
 514         tty_port_hangup(&ifx_dev->tty_port);
 515 }
 516
 517 /**
 518  *      ifx_port_activate
 519  *      @port: our tty port
 520  *
 521  *      tty port activate method - called for first open. Serialized
 522  *      with hangup and shutdown by the tty layer.
 523  */
 524 static int ifx_port_activate(struct tty_port *port, struct tty_struct *tty)
 525 {
 526         struct ifx_spi_device *ifx_dev =
 527                 container_of(port, struct ifx_spi_device, tty_port);
 528
 529         /* clear any old data; can't do this in 'close' */
 530         kfifo_reset(&ifx_dev->tx_fifo);
 531
 532         /* put port data into this tty */
 533         tty->driver_data = ifx_dev;
 534
 535         /* allows flip string push from int context */
 536         tty->low_latency = 1;
 537
 538         return 0;
 539 }
 540
 541 /**
 542  *      ifx_port_shutdown
 543  *      @port: our tty port
 544  *
 545  *      tty port shutdown method - called for last port close. Serialized
 546  *      with hangup and activate by the tty layer.
 547  */
 548 static void ifx_port_shutdown(struct tty_port *port)
 549 {
 550         struct ifx_spi_device *ifx_dev =
 551                 container_of(port, struct ifx_spi_device, tty_port);
 552
 553         mrdy_set_low(ifx_dev);
 554         clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
 555         tasklet_kill(&ifx_dev->io_work_tasklet);
 556 }
 557
 558 static const struct tty_port_operations ifx_tty_port_ops = {
 559         .activate = ifx_port_activate,
 560         .shutdown = ifx_port_shutdown,
 561 };
 562
 563 static const struct tty_operations ifx_spi_serial_ops = {
 564         .open = ifx_spi_open,
 565         .close = ifx_spi_close,
 566         .write = ifx_spi_write,
 567         .hangup = ifx_spi_hangup,
 568         .write_room = ifx_spi_write_room,
 569         .chars_in_buffer = ifx_spi_chars_in_buffer,
 570         .tiocmget = ifx_spi_tiocmget,
 571         .tiocmset = ifx_spi_tiocmset,
 572 };
 573
 574 /**
 575  *      ifx_spi_insert_fip_string       -       queue received data
 576  *      @ifx_ser: our SPI device
 577  *      @chars: buffer we have received
 578  *      @size: number of chars reeived
 579  *
 580  *      Queue bytes to the tty assuming the tty side is currently open. If
 581  *      not the discard the data.
 582  */
 583 static void ifx_spi_insert_flip_string(struct ifx_spi_device *ifx_dev,
 584                                     unsigned char *chars, size_t size)
 585 {
 586         struct tty_struct *tty = tty_port_tty_get(&ifx_dev->tty_port);
 587         if (!tty)
 588                 return;
 589         tty_insert_flip_string(tty, chars, size);
 590         tty_flip_buffer_push(tty);
 591         tty_kref_put(tty);
 592 }
 593
 594 /**
 595  *      ifx_spi_complete        -       SPI transfer completed
 596  *      @ctx: our SPI device
 597  *
 598  *      An SPI transfer has completed. Process any received data and kick off
 599  *      any further transmits we can commence.
 600  */
 601 static void ifx_spi_complete(void *ctx)
 602 {
 603         struct ifx_spi_device *ifx_dev = ctx;
 604         struct tty_struct *tty;
 605         struct tty_ldisc *ldisc = NULL;
 606         int length;
 607         int actual_length;
 608         unsigned char more;
 609         unsigned char cts;
 610         int local_write_pending = 0;
 611         int queue_length;
 612         int srdy;
 613         int decode_result;
 614
 615         mrdy_set_low(ifx_dev);
 616
 617         if (!ifx_dev->spi_msg.status) {
 618                 /* check header validity, get comm flags */
 619                 swap_buf((u16 *)ifx_dev->rx_buffer, IFX_SPI_HEADER_OVERHEAD,
 620                         &ifx_dev->rx_buffer[IFX_SPI_HEADER_OVERHEAD]);
 621                 decode_result = ifx_spi_decode_spi_header(ifx_dev->rx_buffer,
 622                                 &length, &more, &cts);
 623                 if (decode_result == IFX_SPI_HEADER_0) {
 624                         dev_dbg(&ifx_dev->spi_dev->dev,
 625                                 "ignore input: invalid header 0");
 626                         ifx_dev->spi_slave_cts = 0;
 627                         goto complete_exit;
 628                 } else if (decode_result == IFX_SPI_HEADER_F) {
 629                         dev_dbg(&ifx_dev->spi_dev->dev,
 630                                 "ignore input: invalid header F");
 631                         goto complete_exit;
 632                 }
 633
 634                 ifx_dev->spi_slave_cts = cts;
 635
 636                 actual_length = min((unsigned int)length,
 637                                         ifx_dev->spi_msg.actual_length);
 638                 swap_buf((u16 *)(ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD),
 639                          actual_length,
 640                          &ifx_dev->rx_buffer[IFX_SPI_TRANSFER_SIZE]);
 641                 ifx_spi_insert_flip_string(
 642                         ifx_dev,
 643                         ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD,
 644                         (size_t)actual_length);
 645         } else {
 646                 dev_dbg(&ifx_dev->spi_dev->dev, "SPI transfer error %d",
 647                        ifx_dev->spi_msg.status);
 648         }
 649
 650 complete_exit:
 651         if (ifx_dev->write_pending) {
 652                 ifx_dev->write_pending = 0;
 653                 local_write_pending = 1;
 654         }
 655
 656         clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &(ifx_dev->flags));
 657
 658         queue_length = kfifo_len(&ifx_dev->tx_fifo);
 659         srdy = gpio_get_value(ifx_dev->gpio.srdy);
 660         if (!srdy)
 661                 ifx_spi_power_state_clear(ifx_dev, IFX_SPI_POWER_SRDY);
 662
 663         /* schedule output if there is more to do */
 664         if (test_and_clear_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags))
 665                 tasklet_schedule(&ifx_dev->io_work_tasklet);
 666         else {
 667                 if (more || ifx_dev->spi_more || queue_length > 0 ||
 668                         local_write_pending) {
 669                         if (ifx_dev->spi_slave_cts) {
 670                                 if (more)
 671                                         mrdy_assert(ifx_dev);
 672                         } else
 673                                 mrdy_assert(ifx_dev);
 674                 } else {
 675                         /*
 676                          * poke line discipline driver if any for more data
 677                          * may or may not get more data to write
 678                          * for now, say not busy
 679                          */
 680                         ifx_spi_power_state_clear(ifx_dev,
 681                                                   IFX_SPI_POWER_DATA_PENDING);
 682                         tty = tty_port_tty_get(&ifx_dev->tty_port);
 683                         if (tty) {
 684                                 ldisc = tty_ldisc_ref(tty);
 685                                 if (ldisc) {
 686                                         ldisc->ops->write_wakeup(tty);
 687                                         tty_ldisc_deref(ldisc);
 688                                 }
 689                                 tty_kref_put(tty);
 690                         }
 691                 }
 692         }
 693 }
 694
 695 /**
 696  *      ifx_spio_io             -       I/O tasklet
 697  *      @data: our SPI device
 698  *
 699  *      Queue data for transmission if possible and then kick off the
 700  *      transfer.
 701  */
 702 static void ifx_spi_io(unsigned long data)
 703 {
 704         int retval;
 705         struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *) data;
 706
 707         if (!test_and_set_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags)) {
 708                 if (ifx_dev->gpio.unack_srdy_int_nb > 0)
 709                         ifx_dev->gpio.unack_srdy_int_nb--;
 710
 711                 ifx_spi_prepare_tx_buffer(ifx_dev);
 712
 713                 spi_message_init(&ifx_dev->spi_msg);
 714                 INIT_LIST_HEAD(&ifx_dev->spi_msg.queue);
 715
 716                 ifx_dev->spi_msg.context = ifx_dev;
 717                 ifx_dev->spi_msg.complete = ifx_spi_complete;
 718
 719                 /* set up our spi transfer */
 720                 /* note len is BYTES, not transfers */
 721                 ifx_dev->spi_xfer.len = IFX_SPI_TRANSFER_SIZE;
 722                 ifx_dev->spi_xfer.cs_change = 0;
 723                 ifx_dev->spi_xfer.speed_hz = ifx_dev->spi_dev->max_speed_hz;
 724                 /* ifx_dev->spi_xfer.speed_hz = 390625; */
 725                 ifx_dev->spi_xfer.bits_per_word = spi_bpw;
 726
 727                 ifx_dev->spi_xfer.tx_buf = ifx_dev->tx_buffer;
 728                 ifx_dev->spi_xfer.rx_buf = ifx_dev->rx_buffer;
 729
 730                 /*
 731                  * setup dma pointers
 732                  */
 733                 if (ifx_dev->use_dma) {
 734                         ifx_dev->spi_msg.is_dma_mapped = 1;
 735                         ifx_dev->tx_dma = ifx_dev->tx_bus;
 736                         ifx_dev->rx_dma = ifx_dev->rx_bus;
 737                         ifx_dev->spi_xfer.tx_dma = ifx_dev->tx_dma;
 738                         ifx_dev->spi_xfer.rx_dma = ifx_dev->rx_dma;
 739                 } else {
 740                         ifx_dev->spi_msg.is_dma_mapped = 0;
 741                         ifx_dev->tx_dma = (dma_addr_t)0;
 742                         ifx_dev->rx_dma = (dma_addr_t)0;
 743                         ifx_dev->spi_xfer.tx_dma = (dma_addr_t)0;
 744                         ifx_dev->spi_xfer.rx_dma = (dma_addr_t)0;
 745                 }
 746
 747                 spi_message_add_tail(&ifx_dev->spi_xfer, &ifx_dev->spi_msg);
 748
 749                 /* Assert MRDY. This may have already been done by the write
 750                  * routine.
 751                  */
 752                 mrdy_assert(ifx_dev);
 753
 754                 retval = spi_async(ifx_dev->spi_dev, &ifx_dev->spi_msg);
 755                 if (retval) {
 756                         clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS,
 757                                   &ifx_dev->flags);
 758                         tasklet_schedule(&ifx_dev->io_work_tasklet);
 759                         return;
 760                 }
 761         } else
 762                 ifx_dev->write_pending = 1;
 763 }
 764
 765 /**
 766  *      ifx_spi_free_port       -       free up the tty side
 767  *      @ifx_dev: IFX device going away
 768  *
 769  *      Unregister and free up a port when the device goes away
 770  */
 771 static void ifx_spi_free_port(struct ifx_spi_device *ifx_dev)
 772 {
 773         if (ifx_dev->tty_dev)
 774                 tty_unregister_device(tty_drv, ifx_dev->minor);
 775         kfifo_free(&ifx_dev->tx_fifo);
 776 }
 777
 778 /**
 779  *      ifx_spi_create_port     -       create a new port
 780  *      @ifx_dev: our spi device
 781  *
 782  *      Allocate and initialise the tty port that goes with this interface
 783  *      and add it to the tty layer so that it can be opened.
 784  */
 785 static int ifx_spi_create_port(struct ifx_spi_device *ifx_dev)
 786 {
 787         int ret = 0;
 788         struct tty_port *pport = &ifx_dev->tty_port;
 789
 790         spin_lock_init(&ifx_dev->fifo_lock);
 791         lockdep_set_class_and_subclass(&ifx_dev->fifo_lock,
 792                 &ifx_spi_key, 0);
 793
 794         if (kfifo_alloc(&ifx_dev->tx_fifo, IFX_SPI_FIFO_SIZE, GFP_KERNEL)) {
 795                 ret = -ENOMEM;
 796                 goto error_ret;
 797         }
 798
 799         tty_port_init(pport);
 800         pport->ops = &ifx_tty_port_ops;
 801         ifx_dev->minor = IFX_SPI_TTY_ID;
 802         ifx_dev->tty_dev = tty_register_device(tty_drv, ifx_dev->minor,
 803                                                &ifx_dev->spi_dev->dev);
 804         if (IS_ERR(ifx_dev->tty_dev)) {
 805                 dev_dbg(&ifx_dev->spi_dev->dev,
 806                         "%s: registering tty device failed", __func__);
 807                 ret = PTR_ERR(ifx_dev->tty_dev);
 808                 goto error_ret;
 809         }
 810         return 0;
 811
 812 error_ret:
 813         ifx_spi_free_port(ifx_dev);
 814         return ret;
 815 }
 816
 817 /**
 818  *      ifx_spi_handle_srdy             -       handle SRDY
 819  *      @ifx_dev: device asserting SRDY
 820  *
 821  *      Check our device state and see what we need to kick off when SRDY
 822  *      is asserted. This usually means killing the timer and firing off the
 823  *      I/O processing.
 824  */
 825 static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev)
 826 {
 827         if (test_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags)) {
 828                 del_timer_sync(&ifx_dev->spi_timer);
 829                 clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
 830         }
 831
 832         ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_SRDY);
 833
 834         if (!test_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags))
 835                 tasklet_schedule(&ifx_dev->io_work_tasklet);
 836         else
 837                 set_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags);
 838 }
 839
 840 /**
 841  *      ifx_spi_srdy_interrupt  -       SRDY asserted
 842  *      @irq: our IRQ number
 843  *      @dev: our ifx device
 844  *
 845  *      The modem asserted SRDY. Handle the srdy event
 846  */
 847 static irqreturn_t ifx_spi_srdy_interrupt(int irq, void *dev)
 848 {
 849         struct ifx_spi_device *ifx_dev = dev;
 850         ifx_dev->gpio.unack_srdy_int_nb++;
 851         ifx_spi_handle_srdy(ifx_dev);
 852         return IRQ_HANDLED;
 853 }
 854
 855 /**
 856  *      ifx_spi_reset_interrupt -       Modem has changed reset state
 857  *      @irq: interrupt number
 858  *      @dev: our device pointer
 859  *
 860  *      The modem has either entered or left reset state. Check the GPIO
 861  *      line to see which.
 862  *
 863  *      FIXME: review locking on MR_INPROGRESS versus
 864  *      parallel unsolicited reset/solicited reset
 865  */
 866 static irqreturn_t ifx_spi_reset_interrupt(int irq, void *dev)
 867 {
 868         struct ifx_spi_device *ifx_dev = dev;
 869         int val = gpio_get_value(ifx_dev->gpio.reset_out);
 870         int solreset = test_bit(MR_START, &ifx_dev->mdm_reset_state);
 871
 872         if (val == 0) {
 873                 /* entered reset */
 874                 set_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);
 875                 if (!solreset) {
 876                         /* unsolicited reset  */
 877                         ifx_spi_ttyhangup(ifx_dev);
 878                 }
 879         } else {
 880                 /* exited reset */
 881                 clear_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);
 882                 if (solreset) {
 883                         set_bit(MR_COMPLETE, &ifx_dev->mdm_reset_state);
 884                         wake_up(&ifx_dev->mdm_reset_wait);
 885                 }
 886         }
 887         return IRQ_HANDLED;
 888 }
 889
 890 /**
 891  *      ifx_spi_free_device - free device
 892  *      @ifx_dev: device to free
 893  *
 894  *      Free the IFX device
 895  */
 896 static void ifx_spi_free_device(struct ifx_spi_device *ifx_dev)
 897 {
 898         ifx_spi_free_port(ifx_dev);
 899         dma_free_coherent(&ifx_dev->spi_dev->dev,
 900                                 IFX_SPI_TRANSFER_SIZE,
 901                                 ifx_dev->tx_buffer,
 902                                 ifx_dev->tx_bus);
 903         dma_free_coherent(&ifx_dev->spi_dev->dev,
 904                                 IFX_SPI_TRANSFER_SIZE,
 905                                 ifx_dev->rx_buffer,
 906                                 ifx_dev->rx_bus);
 907 }
 908
 909 /**
 910  *      ifx_spi_reset   -       reset modem
 911  *      @ifx_dev: modem to reset
 912  *
 913  *      Perform a reset on the modem
 914  */
 915 static int ifx_spi_reset(struct ifx_spi_device *ifx_dev)
 916 {
 917         int ret;
 918         /*
 919          * set up modem power, reset
 920          *
 921          * delays are required on some platforms for the modem
 922          * to reset properly
 923          */
 924         set_bit(MR_START, &ifx_dev->mdm_reset_state);
 925         gpio_set_value(ifx_dev->gpio.po, 0);
 926         gpio_set_value(ifx_dev->gpio.reset, 0);
 927         msleep(25);
 928         gpio_set_value(ifx_dev->gpio.reset, 1);
 929         msleep(1);
 930         gpio_set_value(ifx_dev->gpio.po, 1);
 931         msleep(1);
 932         gpio_set_value(ifx_dev->gpio.po, 0);
 933         ret = wait_event_timeout(ifx_dev->mdm_reset_wait,
 934                                  test_bit(MR_COMPLETE,
 935                                           &ifx_dev->mdm_reset_state),
 936                                  IFX_RESET_TIMEOUT);
 937         if (!ret)
 938                 dev_warn(&ifx_dev->spi_dev->dev, "Modem reset timeout: (state:%lx)",
 939                          ifx_dev->mdm_reset_state);
 940
 941         ifx_dev->mdm_reset_state = 0;
 942         return ret;
 943 }
 944
 945 /**
 946  *      ifx_spi_spi_probe       -       probe callback
 947  *      @spi: our possible matching SPI device
 948  *
 949  *      Probe for a 6x60 modem on SPI bus. Perform any needed device and
 950  *      GPIO setup.
 951  *
 952  *      FIXME:
 953  *      -       Support for multiple devices
 954  *      -       Split out MID specific GPIO handling eventually
 955  */
 956
 957 static int ifx_spi_spi_probe(struct spi_device *spi)
 958 {
 959         int ret;
 960         int srdy;
 961         struct ifx_modem_platform_data *pl_data;
 962         struct ifx_spi_device *ifx_dev;
 963
 964         if (saved_ifx_dev) {
 965                 dev_dbg(&spi->dev, "ignoring subsequent detection");
 966                 return -ENODEV;
 967         }
 968
 969         pl_data = (struct ifx_modem_platform_data *)spi->dev.platform_data;
 970         if (!pl_data) {
 971                 dev_err(&spi->dev, "missing platform data!");
 972                 return -ENODEV;
 973         }
 974
 975         /* initialize structure to hold our device variables */
 976         ifx_dev = kzalloc(sizeof(struct ifx_spi_device), GFP_KERNEL);
 977         if (!ifx_dev) {
 978                 dev_err(&spi->dev, "spi device allocation failed");
 979                 return -ENOMEM;
 980         }
 981         saved_ifx_dev = ifx_dev;
 982         ifx_dev->spi_dev = spi;
 983         clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags);
 984         spin_lock_init(&ifx_dev->write_lock);
 985         spin_lock_init(&ifx_dev->power_lock);
 986         ifx_dev->power_status = 0;
 987         init_timer(&ifx_dev->spi_timer);
 988         ifx_dev->spi_timer.function = ifx_spi_timeout;
 989         ifx_dev->spi_timer.data = (unsigned long)ifx_dev;
 990         ifx_dev->modem = pl_data->modem_type;
 991         ifx_dev->use_dma = pl_data->use_dma;
 992         ifx_dev->max_hz = pl_data->max_hz;
 993         /* initialize spi mode, etc */
 994         spi->max_speed_hz = ifx_dev->max_hz;
 995         spi->mode = IFX_SPI_MODE | (SPI_LOOP & spi->mode);
 996         spi->bits_per_word = spi_bpw;
 997         ret = spi_setup(spi);
 998         if (ret) {
 999                 dev_err(&spi->dev, "SPI setup wasn't successful %d", ret);
1000                 return -ENODEV;
1001         }
1002
1003         /* ensure SPI protocol flags are initialized to enable transfer */
1004         ifx_dev->spi_more = 0;
1005         ifx_dev->spi_slave_cts = 0;
1006
1007         /*initialize transfer and dma buffers */
1008         ifx_dev->tx_buffer = dma_alloc_coherent(ifx_dev->spi_dev->dev.parent,
1009                                 IFX_SPI_TRANSFER_SIZE,
1010                                 &ifx_dev->tx_bus,
1011                                 GFP_KERNEL);
1012         if (!ifx_dev->tx_buffer) {
1013                 dev_err(&spi->dev, "DMA-TX buffer allocation failed");
1014                 ret = -ENOMEM;
1015                 goto error_ret;
1016         }
1017         ifx_dev->rx_buffer = dma_alloc_coherent(ifx_dev->spi_dev->dev.parent,
1018                                 IFX_SPI_TRANSFER_SIZE,
1019                                 &ifx_dev->rx_bus,
1020                                 GFP_KERNEL);
1021         if (!ifx_dev->rx_buffer) {
1022                 dev_err(&spi->dev, "DMA-RX buffer allocation failed");
1023                 ret = -ENOMEM;
1024                 goto error_ret;
1025         }
1026
1027         /* initialize waitq for modem reset */
1028         init_waitqueue_head(&ifx_dev->mdm_reset_wait);
1029
1030         spi_set_drvdata(spi, ifx_dev);
1031         tasklet_init(&ifx_dev->io_work_tasklet, ifx_spi_io,
1032                                                 (unsigned long)ifx_dev);
1033
1034         set_bit(IFX_SPI_STATE_PRESENT, &ifx_dev->flags);
1035
1036         /* create our tty port */
1037         ret = ifx_spi_create_port(ifx_dev);
1038         if (ret != 0) {
1039                 dev_err(&spi->dev, "create default tty port failed");
1040                 goto error_ret;
1041         }
1042
1043         ifx_dev->gpio.reset = pl_data->rst_pmu;
1044         ifx_dev->gpio.po = pl_data->pwr_on;
1045         ifx_dev->gpio.mrdy = pl_data->mrdy;
1046         ifx_dev->gpio.srdy = pl_data->srdy;
1047         ifx_dev->gpio.reset_out = pl_data->rst_out;
1048
1049         dev_info(&spi->dev, "gpios %d, %d, %d, %d, %d",
1050                  ifx_dev->gpio.reset, ifx_dev->gpio.po, ifx_dev->gpio.mrdy,
1051                  ifx_dev->gpio.srdy, ifx_dev->gpio.reset_out);
1052
1053         /* Configure gpios */
1054         ret = gpio_request(ifx_dev->gpio.reset, "ifxModem");
1055         if (ret < 0) {
1056                 dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET)",
1057                         ifx_dev->gpio.reset);
1058                 goto error_ret;
1059         }
1060         ret += gpio_direction_output(ifx_dev->gpio.reset, 0);
1061         ret += gpio_export(ifx_dev->gpio.reset, 1);
1062         if (ret) {
1063                 dev_err(&spi->dev, "Unable to configure GPIO%d (RESET)",
1064                         ifx_dev->gpio.reset);
1065                 ret = -EBUSY;
1066                 goto error_ret2;
1067         }
1068
1069         ret = gpio_request(ifx_dev->gpio.po, "ifxModem");
1070         ret += gpio_direction_output(ifx_dev->gpio.po, 0);
1071         ret += gpio_export(ifx_dev->gpio.po, 1);
1072         if (ret) {
1073                 dev_err(&spi->dev, "Unable to configure GPIO%d (ON)",
1074                         ifx_dev->gpio.po);
1075                 ret = -EBUSY;
1076                 goto error_ret3;
1077         }
1078
1079         ret = gpio_request(ifx_dev->gpio.mrdy, "ifxModem");
1080         if (ret < 0) {
1081                 dev_err(&spi->dev, "Unable to allocate GPIO%d (MRDY)",
1082                         ifx_dev->gpio.mrdy);
1083                 goto error_ret3;
1084         }
1085         ret += gpio_export(ifx_dev->gpio.mrdy, 1);
1086         ret += gpio_direction_output(ifx_dev->gpio.mrdy, 0);
1087         if (ret) {
1088                 dev_err(&spi->dev, "Unable to configure GPIO%d (MRDY)",
1089                         ifx_dev->gpio.mrdy);
1090                 ret = -EBUSY;
1091                 goto error_ret4;
1092         }
1093
1094         ret = gpio_request(ifx_dev->gpio.srdy, "ifxModem");
1095         if (ret < 0) {
1096                 dev_err(&spi->dev, "Unable to allocate GPIO%d (SRDY)",
1097                         ifx_dev->gpio.srdy);
1098                 ret = -EBUSY;
1099                 goto error_ret4;
1100         }
1101         ret += gpio_export(ifx_dev->gpio.srdy, 1);
1102         ret += gpio_direction_input(ifx_dev->gpio.srdy);
1103         if (ret) {
1104                 dev_err(&spi->dev, "Unable to configure GPIO%d (SRDY)",
1105                         ifx_dev->gpio.srdy);
1106                 ret = -EBUSY;
1107                 goto error_ret5;
1108         }
1109
1110         ret = gpio_request(ifx_dev->gpio.reset_out, "ifxModem");
1111         if (ret < 0) {
1112                 dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET_OUT)",
1113                         ifx_dev->gpio.reset_out);
1114                 goto error_ret5;
1115         }
1116         ret += gpio_export(ifx_dev->gpio.reset_out, 1);
1117         ret += gpio_direction_input(ifx_dev->gpio.reset_out);
1118         if (ret) {
1119                 dev_err(&spi->dev, "Unable to configure GPIO%d (RESET_OUT)",
1120                         ifx_dev->gpio.reset_out);
1121                 ret = -EBUSY;
1122                 goto error_ret6;
1123         }
1124
1125         ret = request_irq(gpio_to_irq(ifx_dev->gpio.reset_out),
1126                           ifx_spi_reset_interrupt,
1127                           IRQF_TRIGGER_RISING|IRQF_TRIGGER_FALLING, DRVNAME,
1128                 (void *)ifx_dev);
1129         if (ret) {
1130                 dev_err(&spi->dev, "Unable to get irq %x\n",
1131                         gpio_to_irq(ifx_dev->gpio.reset_out));
1132                 goto error_ret6;
1133         }
1134
1135         ret = ifx_spi_reset(ifx_dev);
1136
1137         ret = request_irq(gpio_to_irq(ifx_dev->gpio.srdy),
1138                           ifx_spi_srdy_interrupt,
1139                           IRQF_TRIGGER_RISING, DRVNAME,
1140                           (void *)ifx_dev);
1141         if (ret) {
1142                 dev_err(&spi->dev, "Unable to get irq %x",
1143                         gpio_to_irq(ifx_dev->gpio.srdy));
1144                 goto error_ret7;
1145         }
1146
1147         /* set pm runtime power state and register with power system */
1148         pm_runtime_set_active(&spi->dev);
1149         pm_runtime_enable(&spi->dev);
1150
1151         /* handle case that modem is already signaling SRDY */
1152         /* no outgoing tty open at this point, this just satisfies the
1153          * modem's read and should reset communication properly
1154          */
1155         srdy = gpio_get_value(ifx_dev->gpio.srdy);
1156
1157         if (srdy) {
1158                 mrdy_assert(ifx_dev);
1159                 ifx_spi_handle_srdy(ifx_dev);
1160         } else
1161                 mrdy_set_low(ifx_dev);
1162         return 0;
1163
1164 error_ret7:
1165         free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), (void *)ifx_dev);
1166 error_ret6:
1167         gpio_free(ifx_dev->gpio.srdy);
1168 error_ret5:
1169         gpio_free(ifx_dev->gpio.mrdy);
1170 error_ret4:
1171         gpio_free(ifx_dev->gpio.reset);
1172 error_ret3:
1173         gpio_free(ifx_dev->gpio.po);
1174 error_ret2:
1175         gpio_free(ifx_dev->gpio.reset_out);
1176 error_ret:
1177         ifx_spi_free_device(ifx_dev);
1178         saved_ifx_dev = NULL;
1179         return ret;
1180 }
1181
1182 /**
1183  *      ifx_spi_spi_remove      -       SPI device was removed
1184  *      @spi: SPI device
1185  *
1186  *      FIXME: We should be shutting the device down here not in
1187  *      the module unload path.
1188  */
1189
1190 static int ifx_spi_spi_remove(struct spi_device *spi)
1191 {
1192         struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);
1193         /* stop activity */
1194         tasklet_kill(&ifx_dev->io_work_tasklet);
1195         /* free irq */
1196         free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), (void *)ifx_dev);
1197         free_irq(gpio_to_irq(ifx_dev->gpio.srdy), (void *)ifx_dev);
1198
1199         gpio_free(ifx_dev->gpio.srdy);
1200         gpio_free(ifx_dev->gpio.mrdy);
1201         gpio_free(ifx_dev->gpio.reset);
1202         gpio_free(ifx_dev->gpio.po);
1203         gpio_free(ifx_dev->gpio.reset_out);
1204
1205         /* free allocations */
1206         ifx_spi_free_device(ifx_dev);
1207
1208         saved_ifx_dev = NULL;
1209         return 0;
1210 }
1211
1212 /**
1213  *      ifx_spi_spi_shutdown    -       called on SPI shutdown
1214  *      @spi: SPI device
1215  *
1216  *      No action needs to be taken here
1217  */
1218
1219 static void ifx_spi_spi_shutdown(struct spi_device *spi)
1220 {
1221 }
1222
1223 /*
1224  * various suspends and resumes have nothing to do
1225  * no hardware to save state for
1226  */
1227
1228 /**
1229  *      ifx_spi_spi_suspend     -       suspend SPI on system suspend
1230  *      @dev: device being suspended
1231  *
1232  *      Suspend the SPI side. No action needed on Intel MID platforms, may
1233  *      need extending for other systems.
1234  */
1235 static int ifx_spi_spi_suspend(struct spi_device *spi, pm_message_t msg)
1236 {
1237         return 0;
1238 }
1239
1240 /**
1241  *      ifx_spi_spi_resume      -       resume SPI side on system resume
1242  *      @dev: device being suspended
1243  *
1244  *      Suspend the SPI side. No action needed on Intel MID platforms, may
1245  *      need extending for other systems.
1246  */
1247 static int ifx_spi_spi_resume(struct spi_device *spi)
1248 {
1249         return 0;
1250 }
1251
1252 /**
1253  *      ifx_spi_pm_suspend      -       suspend modem on system suspend
1254  *      @dev: device being suspended
1255  *
1256  *      Suspend the modem. No action needed on Intel MID platforms, may
1257  *      need extending for other systems.
1258  */
1259 static int ifx_spi_pm_suspend(struct device *dev)
1260 {
1261         return 0;
1262 }
1263
1264 /**
1265  *      ifx_spi_pm_resume       -       resume modem on system resume
1266  *      @dev: device being suspended
1267  *
1268  *      Allow the modem to resume. No action needed.
1269  *
1270  *      FIXME: do we need to reset anything here ?
1271  */
1272 static int ifx_spi_pm_resume(struct device *dev)
1273 {
1274         return 0;
1275 }
1276
1277 /**
1278  *      ifx_spi_pm_runtime_resume       -       suspend modem
1279  *      @dev: device being suspended
1280  *
1281  *      Allow the modem to resume. No action needed.
1282  */
1283 static int ifx_spi_pm_runtime_resume(struct device *dev)
1284 {
1285         return 0;
1286 }
1287
1288 /**
1289  *      ifx_spi_pm_runtime_suspend      -       suspend modem
1290  *      @dev: device being suspended
1291  *
1292  *      Allow the modem to suspend and thus suspend to continue up the
1293  *      device tree.
1294  */
1295 static int ifx_spi_pm_runtime_suspend(struct device *dev)
1296 {
1297         return 0;
1298 }
1299
1300 /**
1301  *      ifx_spi_pm_runtime_idle         -       check if modem idle
1302  *      @dev: our device
1303  *
1304  *      Check conditions and queue runtime suspend if idle.
1305  */
1306 static int ifx_spi_pm_runtime_idle(struct device *dev)
1307 {
1308         struct spi_device *spi = to_spi_device(dev);
1309         struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);
1310
1311         if (!ifx_dev->power_status)
1312                 pm_runtime_suspend(dev);
1313
1314         return 0;
1315 }
1316
1317 static const struct dev_pm_ops ifx_spi_pm = {
1318         .resume = ifx_spi_pm_resume,
1319         .suspend = ifx_spi_pm_suspend,
1320         .runtime_resume = ifx_spi_pm_runtime_resume,
1321         .runtime_suspend = ifx_spi_pm_runtime_suspend,
1322         .runtime_idle = ifx_spi_pm_runtime_idle
1323 };
1324
1325 static const struct spi_device_id ifx_id_table[] = {
1326         {"ifx6160", 0},
1327         {"ifx6260", 0},
1328         { }
1329 };
1330 MODULE_DEVICE_TABLE(spi, ifx_id_table);
1331
1332 /* spi operations */
1333 static const struct spi_driver ifx_spi_driver = {
1334         .driver = {
1335                 .name = DRVNAME,
1336                 .bus = &spi_bus_type,
1337                 .pm = &ifx_spi_pm,
1338                 .owner = THIS_MODULE},
1339         .probe = ifx_spi_spi_probe,
1340         .shutdown = ifx_spi_spi_shutdown,
1341         .remove = __devexit_p(ifx_spi_spi_remove),
1342         .suspend = ifx_spi_spi_suspend,
1343         .resume = ifx_spi_spi_resume,
1344         .id_table = ifx_id_table
1345 };
1346
1347 /**
1348  *      ifx_spi_exit    -       module exit
1349  *
1350  *      Unload the module.
1351  */
1352
1353 static void __exit ifx_spi_exit(void)
1354 {
1355         /* unregister */
1356         tty_unregister_driver(tty_drv);
1357         spi_unregister_driver((void *)&ifx_spi_driver);
1358 }
1359
1360 /**
1361  *      ifx_spi_init            -       module entry point
1362  *
1363  *      Initialise the SPI and tty interfaces for the IFX SPI driver
1364  *      We need to initialize upper-edge spi driver after the tty
1365  *      driver because otherwise the spi probe will race
1366  */
1367
1368 static int __init ifx_spi_init(void)
1369 {
1370         int result;
1371
1372         tty_drv = alloc_tty_driver(1);
1373         if (!tty_drv) {
1374                 pr_err("%s: alloc_tty_driver failed", DRVNAME);
1375                 return -ENOMEM;
1376         }
1377
1378         tty_drv->magic = TTY_DRIVER_MAGIC;
1379         tty_drv->owner = THIS_MODULE;
1380         tty_drv->driver_name = DRVNAME;
1381         tty_drv->name = TTYNAME;
1382         tty_drv->minor_start = IFX_SPI_TTY_ID;
1383         tty_drv->num = 1;
1384         tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
1385         tty_drv->subtype = SERIAL_TYPE_NORMAL;
1386         tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1387         tty_drv->init_termios = tty_std_termios;
1388
1389         tty_set_operations(tty_drv, &ifx_spi_serial_ops);
1390
1391         result = tty_register_driver(tty_drv);
1392         if (result) {
1393                 pr_err("%s: tty_register_driver failed(%d)",
1394                         DRVNAME, result);
1395                 put_tty_driver(tty_drv);
1396                 return result;
1397         }
1398
1399         result = spi_register_driver((void *)&ifx_spi_driver);
1400         if (result) {
1401                 pr_err("%s: spi_register_driver failed(%d)",
1402                         DRVNAME, result);
1403                 tty_unregister_driver(tty_drv);
1404         }
1405         return result;
1406 }
1407
1408 module_init(ifx_spi_init);
1409 module_exit(ifx_spi_exit);
1410
1411 MODULE_AUTHOR("Intel");
1412 MODULE_DESCRIPTION("IFX6x60 spi driver");
1413 MODULE_LICENSE("GPL");
1414 MODULE_INFO(Version, "0.1-IFX6x60");