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/tty.h>
  45 #include <linux/kfifo.h>
  46 #include <linux/tty_flip.h>
  47 #include <linux/timer.h>
  48 #include <linux/serial.h>
  49 #include <linux/interrupt.h>
  50 #include <linux/irq.h>
  51 #include <linux/rfkill.h>
  52 #include <linux/fs.h>
  53 #include <linux/ip.h>
  54 #include <linux/dmapool.h>
  55 #include <linux/gpio.h>
  56 #include <linux/sched.h>
  57 #include <linux/time.h>
  58 #include <linux/wait.h>
  59 #include <linux/tty.h>
  60 #include <linux/pm.h>
  61 #include <linux/pm_runtime.h>
  62 #include <linux/spi/ifx_modem.h>
  63 #include <linux/delay.h>
  64
  65 #include "ifx6x60.h"
  66
  67 #define IFX_SPI_MORE_MASK               0x10
  68 #define IFX_SPI_MORE_BIT                12      /* bit position in u16 */
  69 #define IFX_SPI_CTS_BIT                 13      /* bit position in u16 */
  70 #define IFX_SPI_MODE                    SPI_MODE_1
  71 #define IFX_SPI_TTY_ID                  0
  72 #define IFX_SPI_TIMEOUT_SEC             2
  73 #define IFX_SPI_HEADER_0                (-1)
  74 #define IFX_SPI_HEADER_F                (-2)
  75
  76 /* forward reference */
  77 static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev);
  78
  79 /* local variables */
  80 static int spi_bpw = 16;                /* 8, 16 or 32 bit word length */
  81 static struct tty_driver *tty_drv;
  82 static struct ifx_spi_device *saved_ifx_dev;
  83 static struct lock_class_key ifx_spi_key;
  84
  85 /* GPIO/GPE settings */
  86
  87 /**
  88  *      mrdy_set_high           -       set MRDY GPIO
  89  *      @ifx: device we are controlling
  90  *
  91  */
  92 static inline void mrdy_set_high(struct ifx_spi_device *ifx)
  93 {
  94         gpio_set_value(ifx->gpio.mrdy, 1);
  95 }
  96
  97 /**
  98  *      mrdy_set_low            -       clear MRDY GPIO
  99  *      @ifx: device we are controlling
 100  *
 101  */
 102 static inline void mrdy_set_low(struct ifx_spi_device *ifx)
 103 {
 104         gpio_set_value(ifx->gpio.mrdy, 0);
 105 }
 106
 107 /**
 108  *      ifx_spi_power_state_set
 109  *      @ifx_dev: our SPI device
 110  *      @val: bits to set
 111  *
 112  *      Set bit in power status and signal power system if status becomes non-0
 113  */
 114 static void
 115 ifx_spi_power_state_set(struct ifx_spi_device *ifx_dev, unsigned char val)
 116 {
 117         unsigned long flags;
 118
 119         spin_lock_irqsave(&ifx_dev->power_lock, flags);
 120
 121         /*
 122          * if power status is already non-0, just update, else
 123          * tell power system
 124          */
 125         if (!ifx_dev->power_status)
 126                 pm_runtime_get(&ifx_dev->spi_dev->dev);
 127         ifx_dev->power_status |= val;
 128
 129         spin_unlock_irqrestore(&ifx_dev->power_lock, flags);
 130 }
 131
 132 /**
 133  *      ifx_spi_power_state_clear       -       clear power bit
 134  *      @ifx_dev: our SPI device
 135  *      @val: bits to clear
 136  *
 137  *      clear bit in power status and signal power system if status becomes 0
 138  */
 139 static void
 140 ifx_spi_power_state_clear(struct ifx_spi_device *ifx_dev, unsigned char val)
 141 {
 142         unsigned long flags;
 143
 144         spin_lock_irqsave(&ifx_dev->power_lock, flags);
 145
 146         if (ifx_dev->power_status) {
 147                 ifx_dev->power_status &= ~val;
 148                 if (!ifx_dev->power_status)
 149                         pm_runtime_put(&ifx_dev->spi_dev->dev);
 150         }
 151
 152         spin_unlock_irqrestore(&ifx_dev->power_lock, flags);
 153 }
 154
 155 /**
 156  *      swap_buf
 157  *      @buf: our buffer
 158  *      @len : number of bytes (not words) in the buffer
 159  *      @end: end of buffer
 160  *
 161  *      Swap the contents of a buffer into big endian format
 162  */
 163 static inline void swap_buf(u16 *buf, int len, void *end)
 164 {
 165         int n;
 166
 167         len = ((len + 1) >> 1);
 168         if ((void *)&buf[len] > end) {
 169                 pr_err("swap_buf: swap exceeds boundary (%p > %p)!",
 170                        &buf[len], end);
 171                 return;
 172         }
 173         for (n = 0; n < len; n++) {
 174                 *buf = cpu_to_be16(*buf);
 175                 buf++;
 176         }
 177 }
 178
 179 /**
 180  *      mrdy_assert             -       assert MRDY line
 181  *      @ifx_dev: our SPI device
 182  *
 183  *      Assert mrdy and set timer to wait for SRDY interrupt, if SRDY is low
 184  *      now.
 185  *
 186  *      FIXME: Can SRDY even go high as we are running this code ?
 187  */
 188 static void mrdy_assert(struct ifx_spi_device *ifx_dev)
 189 {
 190         int val = gpio_get_value(ifx_dev->gpio.srdy);
 191         if (!val) {
 192                 if (!test_and_set_bit(IFX_SPI_STATE_TIMER_PENDING,
 193                                       &ifx_dev->flags)) {
 194                         ifx_dev->spi_timer.expires =
 195                                 jiffies + IFX_SPI_TIMEOUT_SEC*HZ;
 196                         add_timer(&ifx_dev->spi_timer);
 197
 198                 }
 199         }
 200         ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_DATA_PENDING);
 201         mrdy_set_high(ifx_dev);
 202 }
 203
 204 /**
 205  *      ifx_spi_hangup          -       hang up an IFX device
 206  *      @ifx_dev: our SPI device
 207  *
 208  *      Hang up the tty attached to the IFX device if one is currently
 209  *      open. If not take no action
 210  */
 211 static void ifx_spi_ttyhangup(struct ifx_spi_device *ifx_dev)
 212 {
 213         struct tty_port *pport = &ifx_dev->tty_port;
 214         struct tty_struct *tty = tty_port_tty_get(pport);
 215         if (tty) {
 216                 tty_hangup(tty);
 217                 tty_kref_put(tty);
 218         }
 219 }
 220
 221 /**
 222  *      ifx_spi_timeout         -       SPI timeout
 223  *      @arg: our SPI device
 224  *
 225  *      The SPI has timed out: hang up the tty. Users will then see a hangup
 226  *      and error events.
 227  */
 228 static void ifx_spi_timeout(unsigned long arg)
 229 {
 230         struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *)arg;
 231
 232         dev_warn(&ifx_dev->spi_dev->dev, "*** SPI Timeout ***");
 233         ifx_spi_ttyhangup(ifx_dev);
 234         mrdy_set_low(ifx_dev);
 235         clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
 236 }
 237
 238 /* char/tty operations */
 239
 240 /**
 241  *      ifx_spi_tiocmget        -       get modem lines
 242  *      @tty: our tty device
 243  *      @filp: file handle issuing the request
 244  *
 245  *      Map the signal state into Linux modem flags and report the value
 246  *      in Linux terms
 247  */
 248 static int ifx_spi_tiocmget(struct tty_struct *tty)
 249 {
 250         unsigned int value;
 251         struct ifx_spi_device *ifx_dev = tty->driver_data;
 252
 253         value =
 254         (test_bit(IFX_SPI_RTS, &ifx_dev->signal_state) ? TIOCM_RTS : 0) |
 255         (test_bit(IFX_SPI_DTR, &ifx_dev->signal_state) ? TIOCM_DTR : 0) |
 256         (test_bit(IFX_SPI_CTS, &ifx_dev->signal_state) ? TIOCM_CTS : 0) |
 257         (test_bit(IFX_SPI_DSR, &ifx_dev->signal_state) ? TIOCM_DSR : 0) |
 258         (test_bit(IFX_SPI_DCD, &ifx_dev->signal_state) ? TIOCM_CAR : 0) |
 259         (test_bit(IFX_SPI_RI, &ifx_dev->signal_state) ? TIOCM_RNG : 0);
 260         return value;
 261 }
 262
 263 /**
 264  *      ifx_spi_tiocmset        -       set modem bits
 265  *      @tty: the tty structure
 266  *      @set: bits to set
 267  *      @clear: bits to clear
 268  *
 269  *      The IFX6x60 only supports DTR and RTS. Set them accordingly
 270  *      and flag that an update to the modem is needed.
 271  *
 272  *      FIXME: do we need to kick the tranfers when we do this ?
 273  */
 274 static int ifx_spi_tiocmset(struct tty_struct *tty,
 275                             unsigned int set, unsigned int clear)
 276 {
 277         struct ifx_spi_device *ifx_dev = tty->driver_data;
 278
 279         if (set & TIOCM_RTS)
 280                 set_bit(IFX_SPI_RTS, &ifx_dev->signal_state);
 281         if (set & TIOCM_DTR)
 282                 set_bit(IFX_SPI_DTR, &ifx_dev->signal_state);
 283         if (clear & TIOCM_RTS)
 284                 clear_bit(IFX_SPI_RTS, &ifx_dev->signal_state);
 285         if (clear & TIOCM_DTR)
 286                 clear_bit(IFX_SPI_DTR, &ifx_dev->signal_state);
 287
 288         set_bit(IFX_SPI_UPDATE, &ifx_dev->signal_state);
 289         return 0;
 290 }
 291
 292 /**
 293  *      ifx_spi_open    -       called on tty open
 294  *      @tty: our tty device
 295  *      @filp: file handle being associated with the tty
 296  *
 297  *      Open the tty interface. We let the tty_port layer do all the work
 298  *      for us.
 299  *
 300  *      FIXME: Remove single device assumption and saved_ifx_dev
 301  */
 302 static int ifx_spi_open(struct tty_struct *tty, struct file *filp)
 303 {
 304         return tty_port_open(&saved_ifx_dev->tty_port, tty, filp);
 305 }
 306
 307 /**
 308  *      ifx_spi_close   -       called when our tty closes
 309  *      @tty: the tty being closed
 310  *      @filp: the file handle being closed
 311  *
 312  *      Perform the close of the tty. We use the tty_port layer to do all
 313  *      our hard work.
 314  */
 315 static void ifx_spi_close(struct tty_struct *tty, struct file *filp)
 316 {
 317         struct ifx_spi_device *ifx_dev = tty->driver_data;
 318         tty_port_close(&ifx_dev->tty_port, tty, filp);
 319         /* FIXME: should we do an ifx_spi_reset here ? */
 320 }
 321
 322 /**
 323  *      ifx_decode_spi_header   -       decode received header
 324  *      @buffer: the received data
 325  *      @length: decoded length
 326  *      @more: decoded more flag
 327  *      @received_cts: status of cts we received
 328  *
 329  *      Note how received_cts is handled -- if header is all F it is left
 330  *      the same as it was, if header is all 0 it is set to 0 otherwise it is
 331  *      taken from the incoming header.
 332  *
 333  *      FIXME: endianness
 334  */
 335 static int ifx_spi_decode_spi_header(unsigned char *buffer, int *length,
 336                         unsigned char *more, unsigned char *received_cts)
 337 {
 338         u16 h1;
 339         u16 h2;
 340         u16 *in_buffer = (u16 *)buffer;
 341
 342         h1 = *in_buffer;
 343         h2 = *(in_buffer+1);
 344
 345         if (h1 == 0 && h2 == 0) {
 346                 *received_cts = 0;
 347                 return IFX_SPI_HEADER_0;
 348         } else if (h1 == 0xffff && h2 == 0xffff) {
 349                 /* spi_slave_cts remains as it was */
 350                 return IFX_SPI_HEADER_F;
 351         }
 352
 353         *length = h1 & 0xfff;   /* upper bits of byte are flags */
 354         *more = (buffer[1] >> IFX_SPI_MORE_BIT) & 1;
 355         *received_cts = (buffer[3] >> IFX_SPI_CTS_BIT) & 1;
 356         return 0;
 357 }
 358
 359 /**
 360  *      ifx_setup_spi_header    -       set header fields
 361  *      @txbuffer: pointer to start of SPI buffer
 362  *      @tx_count: bytes
 363  *      @more: indicate if more to follow
 364  *
 365  *      Format up an SPI header for a transfer
 366  *
 367  *      FIXME: endianness?
 368  */
 369 static void ifx_spi_setup_spi_header(unsigned char *txbuffer, int tx_count,
 370                                         unsigned char more)
 371 {
 372         *(u16 *)(txbuffer) = tx_count;
 373         *(u16 *)(txbuffer+2) = IFX_SPI_PAYLOAD_SIZE;
 374         txbuffer[1] |= (more << IFX_SPI_MORE_BIT) & IFX_SPI_MORE_MASK;
 375 }
 376
 377 /**
 378  *      ifx_spi_wakeup_serial   -       SPI space made
 379  *      @port_data: our SPI device
 380  *
 381  *      We have emptied the FIFO enough that we want to get more data
 382  *      queued into it. Poke the line discipline via tty_wakeup so that
 383  *      it will feed us more bits
 384  */
 385 static void ifx_spi_wakeup_serial(struct ifx_spi_device *ifx_dev)
 386 {
 387         struct tty_struct *tty;
 388
 389         tty = tty_port_tty_get(&ifx_dev->tty_port);
 390         if (!tty)
 391                 return;
 392         tty_wakeup(tty);
 393         tty_kref_put(tty);
 394 }
 395
 396 /**
 397  *      ifx_spi_prepare_tx_buffer       -       prepare transmit frame
 398  *      @ifx_dev: our SPI device
 399  *
 400  *      The transmit buffr needs a header and various other bits of
 401  *      information followed by as much data as we can pull from the FIFO
 402  *      and transfer. This function formats up a suitable buffer in the
 403  *      ifx_dev->tx_buffer
 404  *
 405  *      FIXME: performance - should we wake the tty when the queue is half
 406  *                           empty ?
 407  */
 408 static int ifx_spi_prepare_tx_buffer(struct ifx_spi_device *ifx_dev)
 409 {
 410         int temp_count;
 411         int queue_length;
 412         int tx_count;
 413         unsigned char *tx_buffer;
 414
 415         tx_buffer = ifx_dev->tx_buffer;
 416         memset(tx_buffer, 0, IFX_SPI_TRANSFER_SIZE);
 417
 418         /* make room for required SPI header */
 419         tx_buffer += IFX_SPI_HEADER_OVERHEAD;
 420         tx_count = IFX_SPI_HEADER_OVERHEAD;
 421
 422         /* clear to signal no more data if this turns out to be the
 423          * last buffer sent in a sequence */
 424         ifx_dev->spi_more = 0;
 425
 426         /* if modem cts is set, just send empty buffer */
 427         if (!ifx_dev->spi_slave_cts) {
 428                 /* see if there's tx data */
 429                 queue_length = kfifo_len(&ifx_dev->tx_fifo);
 430                 if (queue_length != 0) {
 431                         /* data to mux -- see if there's room for it */
 432                         temp_count = min(queue_length, IFX_SPI_PAYLOAD_SIZE);
 433                         temp_count = kfifo_out_locked(&ifx_dev->tx_fifo,
 434                                         tx_buffer, temp_count,
 435                                         &ifx_dev->fifo_lock);
 436
 437                         /* update buffer pointer and data count in message */
 438                         tx_buffer += temp_count;
 439                         tx_count += temp_count;
 440                         if (temp_count == queue_length)
 441                                 /* poke port to get more data */
 442                                 ifx_spi_wakeup_serial(ifx_dev);
 443                         else /* more data in port, use next SPI message */
 444                                 ifx_dev->spi_more = 1;
 445                 }
 446         }
 447         /* have data and info for header -- set up SPI header in buffer */
 448         /* spi header needs payload size, not entire buffer size */
 449         ifx_spi_setup_spi_header(ifx_dev->tx_buffer,
 450                                         tx_count-IFX_SPI_HEADER_OVERHEAD,
 451                                         ifx_dev->spi_more);
 452         /* swap actual data in the buffer */
 453         swap_buf((u16 *)(ifx_dev->tx_buffer), tx_count,
 454                 &ifx_dev->tx_buffer[IFX_SPI_TRANSFER_SIZE]);
 455         return tx_count;
 456 }
 457
 458 /**
 459  *      ifx_spi_write           -       line discipline write
 460  *      @tty: our tty device
 461  *      @buf: pointer to buffer to write (kernel space)
 462  *      @count: size of buffer
 463  *
 464  *      Write the characters we have been given into the FIFO. If the device
 465  *      is not active then activate it, when the SRDY line is asserted back
 466  *      this will commence I/O
 467  */
 468 static int ifx_spi_write(struct tty_struct *tty, const unsigned char *buf,
 469                          int count)
 470 {
 471         struct ifx_spi_device *ifx_dev = tty->driver_data;
 472         unsigned char *tmp_buf = (unsigned char *)buf;
 473         int tx_count = kfifo_in_locked(&ifx_dev->tx_fifo, tmp_buf, count,
 474                                    &ifx_dev->fifo_lock);
 475         mrdy_assert(ifx_dev);
 476         return tx_count;
 477 }
 478
 479 /**
 480  *      ifx_spi_chars_in_buffer -       line discipline helper
 481  *      @tty: our tty device
 482  *
 483  *      Report how much data we can accept before we drop bytes. As we use
 484  *      a simple FIFO this is nice and easy.
 485  */
 486 static int ifx_spi_write_room(struct tty_struct *tty)
 487 {
 488         struct ifx_spi_device *ifx_dev = tty->driver_data;
 489         return IFX_SPI_FIFO_SIZE - kfifo_len(&ifx_dev->tx_fifo);
 490 }
 491
 492 /**
 493  *      ifx_spi_chars_in_buffer -       line discipline helper
 494  *      @tty: our tty device
 495  *
 496  *      Report how many characters we have buffered. In our case this is the
 497  *      number of bytes sitting in our transmit FIFO.
 498  */
 499 static int ifx_spi_chars_in_buffer(struct tty_struct *tty)
 500 {
 501         struct ifx_spi_device *ifx_dev = tty->driver_data;
 502         return kfifo_len(&ifx_dev->tx_fifo);
 503 }
 504
 505 /**
 506  *      ifx_port_hangup
 507  *      @port: our tty port
 508  *
 509  *      tty port hang up. Called when tty_hangup processing is invoked either
 510  *      by loss of carrier, or by software (eg vhangup). Serialized against
 511  *      activate/shutdown by the tty layer.
 512  */
 513 static void ifx_spi_hangup(struct tty_struct *tty)
 514 {
 515         struct ifx_spi_device *ifx_dev = tty->driver_data;
 516         tty_port_hangup(&ifx_dev->tty_port);
 517 }
 518
 519 /**
 520  *      ifx_port_activate
 521  *      @port: our tty port
 522  *
 523  *      tty port activate method - called for first open. Serialized
 524  *      with hangup and shutdown by the tty layer.
 525  */
 526 static int ifx_port_activate(struct tty_port *port, struct tty_struct *tty)
 527 {
 528         struct ifx_spi_device *ifx_dev =
 529                 container_of(port, struct ifx_spi_device, tty_port);
 530
 531         /* clear any old data; can't do this in 'close' */
 532         kfifo_reset(&ifx_dev->tx_fifo);
 533
 534         /* put port data into this tty */
 535         tty->driver_data = ifx_dev;
 536
 537         /* allows flip string push from int context */
 538         tty->low_latency = 1;
 539
 540         return 0;
 541 }
 542
 543 /**
 544  *      ifx_port_shutdown
 545  *      @port: our tty port
 546  *
 547  *      tty port shutdown method - called for last port close. Serialized
 548  *      with hangup and activate by the tty layer.
 549  */
 550 static void ifx_port_shutdown(struct tty_port *port)
 551 {
 552         struct ifx_spi_device *ifx_dev =
 553                 container_of(port, struct ifx_spi_device, tty_port);
 554
 555         mrdy_set_low(ifx_dev);
 556         clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
 557         tasklet_kill(&ifx_dev->io_work_tasklet);
 558 }
 559
 560 static const struct tty_port_operations ifx_tty_port_ops = {
 561         .activate = ifx_port_activate,
 562         .shutdown = ifx_port_shutdown,
 563 };
 564
 565 static const struct tty_operations ifx_spi_serial_ops = {
 566         .open = ifx_spi_open,
 567         .close = ifx_spi_close,
 568         .write = ifx_spi_write,
 569         .hangup = ifx_spi_hangup,
 570         .write_room = ifx_spi_write_room,
 571         .chars_in_buffer = ifx_spi_chars_in_buffer,
 572         .tiocmget = ifx_spi_tiocmget,
 573         .tiocmset = ifx_spi_tiocmset,
 574 };
 575
 576 /**
 577  *      ifx_spi_insert_fip_string       -       queue received data
 578  *      @ifx_ser: our SPI device
 579  *      @chars: buffer we have received
 580  *      @size: number of chars reeived
 581  *
 582  *      Queue bytes to the tty assuming the tty side is currently open. If
 583  *      not the discard the data.
 584  */
 585 static void ifx_spi_insert_flip_string(struct ifx_spi_device *ifx_dev,
 586                                     unsigned char *chars, size_t size)
 587 {
 588         struct tty_struct *tty = tty_port_tty_get(&ifx_dev->tty_port);
 589         if (!tty)
 590                 return;
 591         tty_insert_flip_string(tty, chars, size);
 592         tty_flip_buffer_push(tty);
 593         tty_kref_put(tty);
 594 }
 595
 596 /**
 597  *      ifx_spi_complete        -       SPI transfer completed
 598  *      @ctx: our SPI device
 599  *
 600  *      An SPI transfer has completed. Process any received data and kick off
 601  *      any further transmits we can commence.
 602  */
 603 static void ifx_spi_complete(void *ctx)
 604 {
 605         struct ifx_spi_device *ifx_dev = ctx;
 606         struct tty_struct *tty;
 607         struct tty_ldisc *ldisc = NULL;
 608         int length;
 609         int actual_length;
 610         unsigned char more;
 611         unsigned char cts;
 612         int local_write_pending = 0;
 613         int queue_length;
 614         int srdy;
 615         int decode_result;
 616
 617         mrdy_set_low(ifx_dev);
 618
 619         if (!ifx_dev->spi_msg.status) {
 620                 /* check header validity, get comm flags */
 621                 swap_buf((u16 *)ifx_dev->rx_buffer, IFX_SPI_HEADER_OVERHEAD,
 622                         &ifx_dev->rx_buffer[IFX_SPI_HEADER_OVERHEAD]);
 623                 decode_result = ifx_spi_decode_spi_header(ifx_dev->rx_buffer,
 624                                 &length, &more, &cts);
 625                 if (decode_result == IFX_SPI_HEADER_0) {
 626                         dev_dbg(&ifx_dev->spi_dev->dev,
 627                                 "ignore input: invalid header 0");
 628                         ifx_dev->spi_slave_cts = 0;
 629                         goto complete_exit;
 630                 } else if (decode_result == IFX_SPI_HEADER_F) {
 631                         dev_dbg(&ifx_dev->spi_dev->dev,
 632                                 "ignore input: invalid header F");
 633                         goto complete_exit;
 634                 }
 635
 636                 ifx_dev->spi_slave_cts = cts;
 637
 638                 actual_length = min((unsigned int)length,
 639                                         ifx_dev->spi_msg.actual_length);
 640                 swap_buf((u16 *)(ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD),
 641                          actual_length,
 642                          &ifx_dev->rx_buffer[IFX_SPI_TRANSFER_SIZE]);
 643                 ifx_spi_insert_flip_string(
 644                         ifx_dev,
 645                         ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD,
 646                         (size_t)actual_length);
 647         } else {
 648                 dev_dbg(&ifx_dev->spi_dev->dev, "SPI transfer error %d",
 649                        ifx_dev->spi_msg.status);
 650         }
 651
 652 complete_exit:
 653         if (ifx_dev->write_pending) {
 654                 ifx_dev->write_pending = 0;
 655                 local_write_pending = 1;
 656         }
 657
 658         clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &(ifx_dev->flags));
 659
 660         queue_length = kfifo_len(&ifx_dev->tx_fifo);
 661         srdy = gpio_get_value(ifx_dev->gpio.srdy);
 662         if (!srdy)
 663                 ifx_spi_power_state_clear(ifx_dev, IFX_SPI_POWER_SRDY);
 664
 665         /* schedule output if there is more to do */
 666         if (test_and_clear_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags))
 667                 tasklet_schedule(&ifx_dev->io_work_tasklet);
 668         else {
 669                 if (more || ifx_dev->spi_more || queue_length > 0 ||
 670                         local_write_pending) {
 671                         if (ifx_dev->spi_slave_cts) {
 672                                 if (more)
 673                                         mrdy_assert(ifx_dev);
 674                         } else
 675                                 mrdy_assert(ifx_dev);
 676                 } else {
 677                         /*
 678                          * poke line discipline driver if any for more data
 679                          * may or may not get more data to write
 680                          * for now, say not busy
 681                          */
 682                         ifx_spi_power_state_clear(ifx_dev,
 683                                                   IFX_SPI_POWER_DATA_PENDING);
 684                         tty = tty_port_tty_get(&ifx_dev->tty_port);
 685                         if (tty) {
 686                                 ldisc = tty_ldisc_ref(tty);
 687                                 if (ldisc) {
 688                                         ldisc->ops->write_wakeup(tty);
 689                                         tty_ldisc_deref(ldisc);
 690                                 }
 691                                 tty_kref_put(tty);
 692                         }
 693                 }
 694         }
 695 }
 696
 697 /**
 698  *      ifx_spio_io             -       I/O tasklet
 699  *      @data: our SPI device
 700  *
 701  *      Queue data for transmission if possible and then kick off the
 702  *      transfer.
 703  */
 704 static void ifx_spi_io(unsigned long data)
 705 {
 706         int retval;
 707         struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *) data;
 708
 709         if (!test_and_set_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags)) {
 710                 if (ifx_dev->gpio.unack_srdy_int_nb > 0)
 711                         ifx_dev->gpio.unack_srdy_int_nb--;
 712
 713                 ifx_spi_prepare_tx_buffer(ifx_dev);
 714
 715                 spi_message_init(&ifx_dev->spi_msg);
 716                 INIT_LIST_HEAD(&ifx_dev->spi_msg.queue);
 717
 718                 ifx_dev->spi_msg.context = ifx_dev;
 719                 ifx_dev->spi_msg.complete = ifx_spi_complete;
 720
 721                 /* set up our spi transfer */
 722                 /* note len is BYTES, not transfers */
 723                 ifx_dev->spi_xfer.len = IFX_SPI_TRANSFER_SIZE;
 724                 ifx_dev->spi_xfer.cs_change = 0;
 725                 ifx_dev->spi_xfer.speed_hz = ifx_dev->spi_dev->max_speed_hz;
 726                 /* ifx_dev->spi_xfer.speed_hz = 390625; */
 727                 ifx_dev->spi_xfer.bits_per_word = spi_bpw;
 728
 729                 ifx_dev->spi_xfer.tx_buf = ifx_dev->tx_buffer;
 730                 ifx_dev->spi_xfer.rx_buf = ifx_dev->rx_buffer;
 731
 732                 /*
 733                  * setup dma pointers
 734                  */
 735                 if (ifx_dev->use_dma) {
 736                         ifx_dev->spi_msg.is_dma_mapped = 1;
 737                         ifx_dev->tx_dma = ifx_dev->tx_bus;
 738                         ifx_dev->rx_dma = ifx_dev->rx_bus;
 739                         ifx_dev->spi_xfer.tx_dma = ifx_dev->tx_dma;
 740                         ifx_dev->spi_xfer.rx_dma = ifx_dev->rx_dma;
 741                 } else {
 742                         ifx_dev->spi_msg.is_dma_mapped = 0;
 743                         ifx_dev->tx_dma = (dma_addr_t)0;
 744                         ifx_dev->rx_dma = (dma_addr_t)0;
 745                         ifx_dev->spi_xfer.tx_dma = (dma_addr_t)0;
 746                         ifx_dev->spi_xfer.rx_dma = (dma_addr_t)0;
 747                 }
 748
 749                 spi_message_add_tail(&ifx_dev->spi_xfer, &ifx_dev->spi_msg);
 750
 751                 /* Assert MRDY. This may have already been done by the write
 752                  * routine.
 753                  */
 754                 mrdy_assert(ifx_dev);
 755
 756                 retval = spi_async(ifx_dev->spi_dev, &ifx_dev->spi_msg);
 757                 if (retval) {
 758                         clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS,
 759                                   &ifx_dev->flags);
 760                         tasklet_schedule(&ifx_dev->io_work_tasklet);
 761                         return;
 762                 }
 763         } else
 764                 ifx_dev->write_pending = 1;
 765 }
 766
 767 /**
 768  *      ifx_spi_free_port       -       free up the tty side
 769  *      @ifx_dev: IFX device going away
 770  *
 771  *      Unregister and free up a port when the device goes away
 772  */
 773 static void ifx_spi_free_port(struct ifx_spi_device *ifx_dev)
 774 {
 775         if (ifx_dev->tty_dev)
 776                 tty_unregister_device(tty_drv, ifx_dev->minor);
 777         kfifo_free(&ifx_dev->tx_fifo);
 778 }
 779
 780 /**
 781  *      ifx_spi_create_port     -       create a new port
 782  *      @ifx_dev: our spi device
 783  *
 784  *      Allocate and initialise the tty port that goes with this interface
 785  *      and add it to the tty layer so that it can be opened.
 786  */
 787 static int ifx_spi_create_port(struct ifx_spi_device *ifx_dev)
 788 {
 789         int ret = 0;
 790         struct tty_port *pport = &ifx_dev->tty_port;
 791
 792         spin_lock_init(&ifx_dev->fifo_lock);
 793         lockdep_set_class_and_subclass(&ifx_dev->fifo_lock,
 794                 &ifx_spi_key, 0);
 795
 796         if (kfifo_alloc(&ifx_dev->tx_fifo, IFX_SPI_FIFO_SIZE, GFP_KERNEL)) {
 797                 ret = -ENOMEM;
 798                 goto error_ret;
 799         }
 800
 801         tty_port_init(pport);
 802         pport->ops = &ifx_tty_port_ops;
 803         ifx_dev->minor = IFX_SPI_TTY_ID;
 804         ifx_dev->tty_dev = tty_register_device(tty_drv, ifx_dev->minor,
 805                                                &ifx_dev->spi_dev->dev);
 806         if (IS_ERR(ifx_dev->tty_dev)) {
 807                 dev_dbg(&ifx_dev->spi_dev->dev,
 808                         "%s: registering tty device failed", __func__);
 809                 ret = PTR_ERR(ifx_dev->tty_dev);
 810                 goto error_ret;
 811         }
 812         return 0;
 813
 814 error_ret:
 815         ifx_spi_free_port(ifx_dev);
 816         return ret;
 817 }
 818
 819 /**
 820  *      ifx_spi_handle_srdy             -       handle SRDY
 821  *      @ifx_dev: device asserting SRDY
 822  *
 823  *      Check our device state and see what we need to kick off when SRDY
 824  *      is asserted. This usually means killing the timer and firing off the
 825  *      I/O processing.
 826  */
 827 static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev)
 828 {
 829         if (test_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags)) {
 830                 del_timer_sync(&ifx_dev->spi_timer);
 831                 clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
 832         }
 833
 834         ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_SRDY);
 835
 836         if (!test_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags))
 837                 tasklet_schedule(&ifx_dev->io_work_tasklet);
 838         else
 839                 set_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags);
 840 }
 841
 842 /**
 843  *      ifx_spi_srdy_interrupt  -       SRDY asserted
 844  *      @irq: our IRQ number
 845  *      @dev: our ifx device
 846  *
 847  *      The modem asserted SRDY. Handle the srdy event
 848  */
 849 static irqreturn_t ifx_spi_srdy_interrupt(int irq, void *dev)
 850 {
 851         struct ifx_spi_device *ifx_dev = dev;
 852         ifx_dev->gpio.unack_srdy_int_nb++;
 853         ifx_spi_handle_srdy(ifx_dev);
 854         return IRQ_HANDLED;
 855 }
 856
 857 /**
 858  *      ifx_spi_reset_interrupt -       Modem has changed reset state
 859  *      @irq: interrupt number
 860  *      @dev: our device pointer
 861  *
 862  *      The modem has either entered or left reset state. Check the GPIO
 863  *      line to see which.
 864  *
 865  *      FIXME: review locking on MR_INPROGRESS versus
 866  *      parallel unsolicited reset/solicited reset
 867  */
 868 static irqreturn_t ifx_spi_reset_interrupt(int irq, void *dev)
 869 {
 870         struct ifx_spi_device *ifx_dev = dev;
 871         int val = gpio_get_value(ifx_dev->gpio.reset_out);
 872         int solreset = test_bit(MR_START, &ifx_dev->mdm_reset_state);
 873
 874         if (val == 0) {
 875                 /* entered reset */
 876                 set_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);
 877                 if (!solreset) {
 878                         /* unsolicited reset  */
 879                         ifx_spi_ttyhangup(ifx_dev);
 880                 }
 881         } else {
 882                 /* exited reset */
 883                 clear_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);
 884                 if (solreset) {
 885                         set_bit(MR_COMPLETE, &ifx_dev->mdm_reset_state);
 886                         wake_up(&ifx_dev->mdm_reset_wait);
 887                 }
 888         }
 889         return IRQ_HANDLED;
 890 }
 891
 892 /**
 893  *      ifx_spi_free_device - free device
 894  *      @ifx_dev: device to free
 895  *
 896  *      Free the IFX device
 897  */
 898 static void ifx_spi_free_device(struct ifx_spi_device *ifx_dev)
 899 {
 900         ifx_spi_free_port(ifx_dev);
 901         dma_free_coherent(&ifx_dev->spi_dev->dev,
 902                                 IFX_SPI_TRANSFER_SIZE,
 903                                 ifx_dev->tx_buffer,
 904                                 ifx_dev->tx_bus);
 905         dma_free_coherent(&ifx_dev->spi_dev->dev,
 906                                 IFX_SPI_TRANSFER_SIZE,
 907                                 ifx_dev->rx_buffer,
 908                                 ifx_dev->rx_bus);
 909 }
 910
 911 /**
 912  *      ifx_spi_reset   -       reset modem
 913  *      @ifx_dev: modem to reset
 914  *
 915  *      Perform a reset on the modem
 916  */
 917 static int ifx_spi_reset(struct ifx_spi_device *ifx_dev)
 918 {
 919         int ret;
 920         /*
 921          * set up modem power, reset
 922          *
 923          * delays are required on some platforms for the modem
 924          * to reset properly
 925          */
 926         set_bit(MR_START, &ifx_dev->mdm_reset_state);
 927         gpio_set_value(ifx_dev->gpio.po, 0);
 928         gpio_set_value(ifx_dev->gpio.reset, 0);
 929         msleep(25);
 930         gpio_set_value(ifx_dev->gpio.reset, 1);
 931         msleep(1);
 932         gpio_set_value(ifx_dev->gpio.po, 1);
 933         msleep(1);
 934         gpio_set_value(ifx_dev->gpio.po, 0);
 935         ret = wait_event_timeout(ifx_dev->mdm_reset_wait,
 936                                  test_bit(MR_COMPLETE,
 937                                           &ifx_dev->mdm_reset_state),
 938                                  IFX_RESET_TIMEOUT);
 939         if (!ret)
 940                 dev_warn(&ifx_dev->spi_dev->dev, "Modem reset timeout: (state:%lx)",
 941                          ifx_dev->mdm_reset_state);
 942
 943         ifx_dev->mdm_reset_state = 0;
 944         return ret;
 945 }
 946
 947 /**
 948  *      ifx_spi_spi_probe       -       probe callback
 949  *      @spi: our possible matching SPI device
 950  *
 951  *      Probe for a 6x60 modem on SPI bus. Perform any needed device and
 952  *      GPIO setup.
 953  *
 954  *      FIXME:
 955  *      -       Support for multiple devices
 956  *      -       Split out MID specific GPIO handling eventually
 957  */
 958
 959 static int ifx_spi_spi_probe(struct spi_device *spi)
 960 {
 961         int ret;
 962         int srdy;
 963         struct ifx_modem_platform_data *pl_data;
 964         struct ifx_spi_device *ifx_dev;
 965
 966         if (saved_ifx_dev) {
 967                 dev_dbg(&spi->dev, "ignoring subsequent detection");
 968                 return -ENODEV;
 969         }
 970
 971         pl_data = (struct ifx_modem_platform_data *)spi->dev.platform_data;
 972         if (!pl_data) {
 973                 dev_err(&spi->dev, "missing platform data!");
 974                 return -ENODEV;
 975         }
 976
 977         /* initialize structure to hold our device variables */
 978         ifx_dev = kzalloc(sizeof(struct ifx_spi_device), GFP_KERNEL);
 979         if (!ifx_dev) {
 980                 dev_err(&spi->dev, "spi device allocation failed");
 981                 return -ENOMEM;
 982         }
 983         saved_ifx_dev = ifx_dev;
 984         ifx_dev->spi_dev = spi;
 985         clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags);
 986         spin_lock_init(&ifx_dev->write_lock);
 987         spin_lock_init(&ifx_dev->power_lock);
 988         ifx_dev->power_status = 0;
 989         init_timer(&ifx_dev->spi_timer);
 990         ifx_dev->spi_timer.function = ifx_spi_timeout;
 991         ifx_dev->spi_timer.data = (unsigned long)ifx_dev;
 992         ifx_dev->modem = pl_data->modem_type;
 993         ifx_dev->use_dma = pl_data->use_dma;
 994         ifx_dev->max_hz = pl_data->max_hz;
 995         /* initialize spi mode, etc */
 996         spi->max_speed_hz = ifx_dev->max_hz;
 997         spi->mode = IFX_SPI_MODE | (SPI_LOOP & spi->mode);
 998         spi->bits_per_word = spi_bpw;
 999         ret = spi_setup(spi);
1000         if (ret) {
1001                 dev_err(&spi->dev, "SPI setup wasn't successful %d", ret);
1002                 return -ENODEV;
1003         }
1004
1005         /* ensure SPI protocol flags are initialized to enable transfer */
1006         ifx_dev->spi_more = 0;
1007         ifx_dev->spi_slave_cts = 0;
1008
1009         /*initialize transfer and dma buffers */
1010         ifx_dev->tx_buffer = dma_alloc_coherent(ifx_dev->spi_dev->dev.parent,
1011                                 IFX_SPI_TRANSFER_SIZE,
1012                                 &ifx_dev->tx_bus,
1013                                 GFP_KERNEL);
1014         if (!ifx_dev->tx_buffer) {
1015                 dev_err(&spi->dev, "DMA-TX buffer allocation failed");
1016                 ret = -ENOMEM;
1017                 goto error_ret;
1018         }
1019         ifx_dev->rx_buffer = dma_alloc_coherent(ifx_dev->spi_dev->dev.parent,
1020                                 IFX_SPI_TRANSFER_SIZE,
1021                                 &ifx_dev->rx_bus,
1022                                 GFP_KERNEL);
1023         if (!ifx_dev->rx_buffer) {
1024                 dev_err(&spi->dev, "DMA-RX buffer allocation failed");
1025                 ret = -ENOMEM;
1026                 goto error_ret;
1027         }
1028
1029         /* initialize waitq for modem reset */
1030         init_waitqueue_head(&ifx_dev->mdm_reset_wait);
1031
1032         spi_set_drvdata(spi, ifx_dev);
1033         tasklet_init(&ifx_dev->io_work_tasklet, ifx_spi_io,
1034                                                 (unsigned long)ifx_dev);
1035
1036         set_bit(IFX_SPI_STATE_PRESENT, &ifx_dev->flags);
1037
1038         /* create our tty port */
1039         ret = ifx_spi_create_port(ifx_dev);
1040         if (ret != 0) {
1041                 dev_err(&spi->dev, "create default tty port failed");
1042                 goto error_ret;
1043         }
1044
1045         ifx_dev->gpio.reset = pl_data->rst_pmu;
1046         ifx_dev->gpio.po = pl_data->pwr_on;
1047         ifx_dev->gpio.mrdy = pl_data->mrdy;
1048         ifx_dev->gpio.srdy = pl_data->srdy;
1049         ifx_dev->gpio.reset_out = pl_data->rst_out;
1050
1051         dev_info(&spi->dev, "gpios %d, %d, %d, %d, %d",
1052                  ifx_dev->gpio.reset, ifx_dev->gpio.po, ifx_dev->gpio.mrdy,
1053                  ifx_dev->gpio.srdy, ifx_dev->gpio.reset_out);
1054
1055         /* Configure gpios */
1056         ret = gpio_request(ifx_dev->gpio.reset, "ifxModem");
1057         if (ret < 0) {
1058                 dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET)",
1059                         ifx_dev->gpio.reset);
1060                 goto error_ret;
1061         }
1062         ret += gpio_direction_output(ifx_dev->gpio.reset, 0);
1063         ret += gpio_export(ifx_dev->gpio.reset, 1);
1064         if (ret) {
1065                 dev_err(&spi->dev, "Unable to configure GPIO%d (RESET)",
1066                         ifx_dev->gpio.reset);
1067                 ret = -EBUSY;
1068                 goto error_ret2;
1069         }
1070
1071         ret = gpio_request(ifx_dev->gpio.po, "ifxModem");
1072         ret += gpio_direction_output(ifx_dev->gpio.po, 0);
1073         ret += gpio_export(ifx_dev->gpio.po, 1);
1074         if (ret) {
1075                 dev_err(&spi->dev, "Unable to configure GPIO%d (ON)",
1076                         ifx_dev->gpio.po);
1077                 ret = -EBUSY;
1078                 goto error_ret3;
1079         }
1080
1081         ret = gpio_request(ifx_dev->gpio.mrdy, "ifxModem");
1082         if (ret < 0) {
1083                 dev_err(&spi->dev, "Unable to allocate GPIO%d (MRDY)",
1084                         ifx_dev->gpio.mrdy);
1085                 goto error_ret3;
1086         }
1087         ret += gpio_export(ifx_dev->gpio.mrdy, 1);
1088         ret += gpio_direction_output(ifx_dev->gpio.mrdy, 0);
1089         if (ret) {
1090                 dev_err(&spi->dev, "Unable to configure GPIO%d (MRDY)",
1091                         ifx_dev->gpio.mrdy);
1092                 ret = -EBUSY;
1093                 goto error_ret4;
1094         }
1095
1096         ret = gpio_request(ifx_dev->gpio.srdy, "ifxModem");
1097         if (ret < 0) {
1098                 dev_err(&spi->dev, "Unable to allocate GPIO%d (SRDY)",
1099                         ifx_dev->gpio.srdy);
1100                 ret = -EBUSY;
1101                 goto error_ret4;
1102         }
1103         ret += gpio_export(ifx_dev->gpio.srdy, 1);
1104         ret += gpio_direction_input(ifx_dev->gpio.srdy);
1105         if (ret) {
1106                 dev_err(&spi->dev, "Unable to configure GPIO%d (SRDY)",
1107                         ifx_dev->gpio.srdy);
1108                 ret = -EBUSY;
1109                 goto error_ret5;
1110         }
1111
1112         ret = gpio_request(ifx_dev->gpio.reset_out, "ifxModem");
1113         if (ret < 0) {
1114                 dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET_OUT)",
1115                         ifx_dev->gpio.reset_out);
1116                 goto error_ret5;
1117         }
1118         ret += gpio_export(ifx_dev->gpio.reset_out, 1);
1119         ret += gpio_direction_input(ifx_dev->gpio.reset_out);
1120         if (ret) {
1121                 dev_err(&spi->dev, "Unable to configure GPIO%d (RESET_OUT)",
1122                         ifx_dev->gpio.reset_out);
1123                 ret = -EBUSY;
1124                 goto error_ret6;
1125         }
1126
1127         ret = request_irq(gpio_to_irq(ifx_dev->gpio.reset_out),
1128                           ifx_spi_reset_interrupt,
1129                           IRQF_TRIGGER_RISING|IRQF_TRIGGER_FALLING, DRVNAME,
1130                 (void *)ifx_dev);
1131         if (ret) {
1132                 dev_err(&spi->dev, "Unable to get irq %x\n",
1133                         gpio_to_irq(ifx_dev->gpio.reset_out));
1134                 goto error_ret6;
1135         }
1136
1137         ret = ifx_spi_reset(ifx_dev);
1138
1139         ret = request_irq(gpio_to_irq(ifx_dev->gpio.srdy),
1140                           ifx_spi_srdy_interrupt,
1141                           IRQF_TRIGGER_RISING, DRVNAME,
1142                           (void *)ifx_dev);
1143         if (ret) {
1144                 dev_err(&spi->dev, "Unable to get irq %x",
1145                         gpio_to_irq(ifx_dev->gpio.srdy));
1146                 goto error_ret7;
1147         }
1148
1149         /* set pm runtime power state and register with power system */
1150         pm_runtime_set_active(&spi->dev);
1151         pm_runtime_enable(&spi->dev);
1152
1153         /* handle case that modem is already signaling SRDY */
1154         /* no outgoing tty open at this point, this just satisfies the
1155          * modem's read and should reset communication properly
1156          */
1157         srdy = gpio_get_value(ifx_dev->gpio.srdy);
1158
1159         if (srdy) {
1160                 mrdy_assert(ifx_dev);
1161                 ifx_spi_handle_srdy(ifx_dev);
1162         } else
1163                 mrdy_set_low(ifx_dev);
1164         return 0;
1165
1166 error_ret7:
1167         free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), (void *)ifx_dev);
1168 error_ret6:
1169         gpio_free(ifx_dev->gpio.srdy);
1170 error_ret5:
1171         gpio_free(ifx_dev->gpio.mrdy);
1172 error_ret4:
1173         gpio_free(ifx_dev->gpio.reset);
1174 error_ret3:
1175         gpio_free(ifx_dev->gpio.po);
1176 error_ret2:
1177         gpio_free(ifx_dev->gpio.reset_out);
1178 error_ret:
1179         ifx_spi_free_device(ifx_dev);
1180         saved_ifx_dev = NULL;
1181         return ret;
1182 }
1183
1184 /**
1185  *      ifx_spi_spi_remove      -       SPI device was removed
1186  *      @spi: SPI device
1187  *
1188  *      FIXME: We should be shutting the device down here not in
1189  *      the module unload path.
1190  */
1191
1192 static int ifx_spi_spi_remove(struct spi_device *spi)
1193 {
1194         struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);
1195         /* stop activity */
1196         tasklet_kill(&ifx_dev->io_work_tasklet);
1197         /* free irq */
1198         free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), (void *)ifx_dev);
1199         free_irq(gpio_to_irq(ifx_dev->gpio.srdy), (void *)ifx_dev);
1200
1201         gpio_free(ifx_dev->gpio.srdy);
1202         gpio_free(ifx_dev->gpio.mrdy);
1203         gpio_free(ifx_dev->gpio.reset);
1204         gpio_free(ifx_dev->gpio.po);
1205         gpio_free(ifx_dev->gpio.reset_out);
1206
1207         /* free allocations */
1208         ifx_spi_free_device(ifx_dev);
1209
1210         saved_ifx_dev = NULL;
1211         return 0;
1212 }
1213
1214 /**
1215  *      ifx_spi_spi_shutdown    -       called on SPI shutdown
1216  *      @spi: SPI device
1217  *
1218  *      No action needs to be taken here
1219  */
1220
1221 static void ifx_spi_spi_shutdown(struct spi_device *spi)
1222 {
1223 }
1224
1225 /*
1226  * various suspends and resumes have nothing to do
1227  * no hardware to save state for
1228  */
1229
1230 /**
1231  *      ifx_spi_spi_suspend     -       suspend SPI on system suspend
1232  *      @dev: device being suspended
1233  *
1234  *      Suspend the SPI side. No action needed on Intel MID platforms, may
1235  *      need extending for other systems.
1236  */
1237 static int ifx_spi_spi_suspend(struct spi_device *spi, pm_message_t msg)
1238 {
1239         return 0;
1240 }
1241
1242 /**
1243  *      ifx_spi_spi_resume      -       resume SPI side on system resume
1244  *      @dev: device being suspended
1245  *
1246  *      Suspend the SPI side. No action needed on Intel MID platforms, may
1247  *      need extending for other systems.
1248  */
1249 static int ifx_spi_spi_resume(struct spi_device *spi)
1250 {
1251         return 0;
1252 }
1253
1254 /**
1255  *      ifx_spi_pm_suspend      -       suspend modem on system suspend
1256  *      @dev: device being suspended
1257  *
1258  *      Suspend the modem. No action needed on Intel MID platforms, may
1259  *      need extending for other systems.
1260  */
1261 static int ifx_spi_pm_suspend(struct device *dev)
1262 {
1263         return 0;
1264 }
1265
1266 /**
1267  *      ifx_spi_pm_resume       -       resume modem on system resume
1268  *      @dev: device being suspended
1269  *
1270  *      Allow the modem to resume. No action needed.
1271  *
1272  *      FIXME: do we need to reset anything here ?
1273  */
1274 static int ifx_spi_pm_resume(struct device *dev)
1275 {
1276         return 0;
1277 }
1278
1279 /**
1280  *      ifx_spi_pm_runtime_resume       -       suspend modem
1281  *      @dev: device being suspended
1282  *
1283  *      Allow the modem to resume. No action needed.
1284  */
1285 static int ifx_spi_pm_runtime_resume(struct device *dev)
1286 {
1287         return 0;
1288 }
1289
1290 /**
1291  *      ifx_spi_pm_runtime_suspend      -       suspend modem
1292  *      @dev: device being suspended
1293  *
1294  *      Allow the modem to suspend and thus suspend to continue up the
1295  *      device tree.
1296  */
1297 static int ifx_spi_pm_runtime_suspend(struct device *dev)
1298 {
1299         return 0;
1300 }
1301
1302 /**
1303  *      ifx_spi_pm_runtime_idle         -       check if modem idle
1304  *      @dev: our device
1305  *
1306  *      Check conditions and queue runtime suspend if idle.
1307  */
1308 static int ifx_spi_pm_runtime_idle(struct device *dev)
1309 {
1310         struct spi_device *spi = to_spi_device(dev);
1311         struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);
1312
1313         if (!ifx_dev->power_status)
1314                 pm_runtime_suspend(dev);
1315
1316         return 0;
1317 }
1318
1319 static const struct dev_pm_ops ifx_spi_pm = {
1320         .resume = ifx_spi_pm_resume,
1321         .suspend = ifx_spi_pm_suspend,
1322         .runtime_resume = ifx_spi_pm_runtime_resume,
1323         .runtime_suspend = ifx_spi_pm_runtime_suspend,
1324         .runtime_idle = ifx_spi_pm_runtime_idle
1325 };
1326
1327 static const struct spi_device_id ifx_id_table[] = {
1328         {"ifx6160", 0},
1329         {"ifx6260", 0},
1330         { }
1331 };
1332 MODULE_DEVICE_TABLE(spi, ifx_id_table);
1333
1334 /* spi operations */
1335 static const struct spi_driver ifx_spi_driver = {
1336         .driver = {
1337                 .name = DRVNAME,
1338                 .bus = &spi_bus_type,
1339                 .pm = &ifx_spi_pm,
1340                 .owner = THIS_MODULE},
1341         .probe = ifx_spi_spi_probe,
1342         .shutdown = ifx_spi_spi_shutdown,
1343         .remove = __devexit_p(ifx_spi_spi_remove),
1344         .suspend = ifx_spi_spi_suspend,
1345         .resume = ifx_spi_spi_resume,
1346         .id_table = ifx_id_table
1347 };
1348
1349 /**
1350  *      ifx_spi_exit    -       module exit
1351  *
1352  *      Unload the module.
1353  */
1354
1355 static void __exit ifx_spi_exit(void)
1356 {
1357         /* unregister */
1358         tty_unregister_driver(tty_drv);
1359         spi_unregister_driver((void *)&ifx_spi_driver);
1360 }
1361
1362 /**
1363  *      ifx_spi_init            -       module entry point
1364  *
1365  *      Initialise the SPI and tty interfaces for the IFX SPI driver
1366  *      We need to initialize upper-edge spi driver after the tty
1367  *      driver because otherwise the spi probe will race
1368  */
1369
1370 static int __init ifx_spi_init(void)
1371 {
1372         int result;
1373
1374         tty_drv = alloc_tty_driver(1);
1375         if (!tty_drv) {
1376                 pr_err("%s: alloc_tty_driver failed", DRVNAME);
1377                 return -ENOMEM;
1378         }
1379
1380         tty_drv->magic = TTY_DRIVER_MAGIC;
1381         tty_drv->owner = THIS_MODULE;
1382         tty_drv->driver_name = DRVNAME;
1383         tty_drv->name = TTYNAME;
1384         tty_drv->minor_start = IFX_SPI_TTY_ID;
1385         tty_drv->num = 1;
1386         tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
1387         tty_drv->subtype = SERIAL_TYPE_NORMAL;
1388         tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1389         tty_drv->init_termios = tty_std_termios;
1390
1391         tty_set_operations(tty_drv, &ifx_spi_serial_ops);
1392
1393         result = tty_register_driver(tty_drv);
1394         if (result) {
1395                 pr_err("%s: tty_register_driver failed(%d)",
1396                         DRVNAME, result);
1397                 put_tty_driver(tty_drv);
1398                 return result;
1399         }
1400
1401         result = spi_register_driver((void *)&ifx_spi_driver);
1402         if (result) {
1403                 pr_err("%s: spi_register_driver failed(%d)",
1404                         DRVNAME, result);
1405                 tty_unregister_driver(tty_drv);
1406         }
1407         return result;
1408 }
1409
1410 module_init(ifx_spi_init);
1411 module_exit(ifx_spi_exit);
1412
1413 MODULE_AUTHOR("Intel");
1414 MODULE_DESCRIPTION("IFX6x60 spi driver");
1415 MODULE_LICENSE("GPL");
1416 MODULE_INFO(Version, "0.1-IFX6x60");