卓胜微（MAXSCEND）芯片的cmmb驱动【ANDROID+展讯8810平台】

 

 

#include <linux/init.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/ioctl.h>
#include <linux/fs.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>

#include <linux/spi/spi.h>
#include <linux/spi/spidev.h>

#include <asm/uaccess.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/delay.h>

#include <mach/dma.h>
#include <mach/hardware.h>
#include <mach/gpio.h>
#include <mach/ldo.h>
#include <mach/adi_hal_internal.h>
#include <mach/regs_ana.h>
//add by zhangbing for intr.
#define __USE_EXTERNAL_INTR__
#ifdef __USE_EXTERNAL_INTR__
//add for irq mode
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/sched.h>
#endif
/*
 * This supports acccess to SPI devices using normal userspace I/O calls.
 * Note that while traditional UNIX/POSIX I/O semantics are half duplex,
 * and often mask message boundaries, full SPI support requires full duplex
 * transfers.  There are several kinds of of internal message boundaries to
 * handle chipselect management and other protocol options.
 *
 * SPI has a character major number assigned.  We allocate minor numbers
 * dynamically using a bitmask.  You must use hotplug tools, such as udev
 * (or mdev with busybox) to create and destroy the /dev/mxdspidevB.C device
 * nodes, since there is no fixed association of minor numbers with any
 * particular SPI bus or device.
 */
//#define SPIDEV_MAJOR   153 /* assigned */
int  SPIDEV_MAJOR =  153; /* assigned */

#define N_SPI_MINORS   32 /* ... up to 256 */

static unsigned long minors[N_SPI_MINORS / BITS_PER_LONG];
extern struct spi_device *sprd_spi_cmmb_device_register(int master_bus_num, struct spi_board_info *chip);
extern void sprd_spi_tmod(struct spi_device *spi, u32 transfer_mod);

/* Bit masks for spi_device.mode management.  Note that incorrect
 * settings for CS_HIGH and 3WIRE can cause *lots* of trouble for other
 * devices on a shared bus:  CS_HIGH, because this device will be
 * active when it shouldn't be;  3WIRE, because when active it won't
 * behave as it should.
 *
 * REVISIT should changing those two modes be privileged?
 */
#define SPI_MODE_MASK  (SPI_CPHA | SPI_CPOL | SPI_CS_HIGH \
    | SPI_LSB_FIRST | SPI_3WIRE | SPI_LOOP)

struct mxdspidev_data {
 dev_t   devt;
 spinlock_t  spi_lock;
 struct spi_device *spi;
 struct list_head device_entry;

 //add by zhangbing.
#ifdef __USE_EXTERNAL_INTR__
 /*add for irq mode*/
 unsigned long irq_flag; /* irq flag */
 unsigned char irq_enable;
 wait_queue_head_t iowait; /* use for user space polling */
#endif

 /* buffer is NULL unless this device is open (users > 0) */
 struct mutex  buf_lock;
 unsigned  users;
 u8   *buffer;
};

static LIST_HEAD(device_list);
static DEFINE_MUTEX(device_list_lock);

static unsigned bufsiz = (64*1024);
module_param(bufsiz, uint, S_IRUGO);
MODULE_PARM_DESC(bufsiz, "data bytes in biggest supported SPI message");

extern int sprd_3rdparty_gpio_cmmb_power;
extern int sprd_3rdparty_gpio_cmmb_reset;
extern int sprd_3rdparty_gpio_cmmb_irq;
static int spi_cs_gpio;

 

int comip_mxd0251_power(int onoff)
{

 if (onoff) {
 
  //gpio_direction_output(sprd_3rdparty_gpio_cmmb_power, 1);
  /*
  LDO_VOLT_LEVEL2 1.8mv
  LDO_VOLT_LEVEL3 1.2mv */
  LDO_SetVoltLevel(LDO_LDO_SIM3,LDO_VOLT_LEVEL3);
  LDO_TurnOffLDO(LDO_LDO_SIM3);// add by duanxufang;
  printk("maxscend:dxf,LDO_TurnOffLDO power-on 1");
  
  LDO_SetVoltLevel(LDO_LDO_RF1,LDO_VOLT_LEVEL2);
  LDO_TurnOnLDO(LDO_LDO_RF1);
  
  LDO_SetVoltLevel(LDO_LDO_SIM3,LDO_VOLT_LEVEL3);
  LDO_TurnOffLDO(LDO_LDO_SIM3);// add by duanxufang;

  printk("maxscend:dxf,LDO_TurnOffLDO power-on 2");
  msleep(20);
  gpio_direction_output(spi_cs_gpio, 1);
  ANA_REG_OR(ANA_MIXED_CTRL, BIT_6);//REF1_OUT
  msleep(20);
  
  gpio_direction_output(sprd_3rdparty_gpio_cmmb_reset, 1);
  msleep(20);
  gpio_direction_output(sprd_3rdparty_gpio_cmmb_reset, 0);
  msleep(100);
  gpio_direction_output(sprd_3rdparty_gpio_cmmb_reset, 1);
  
  msleep(10);
 }
 else
 {
  ANA_REG_AND(ANA_MIXED_CTRL, ~BIT_6);
  gpio_direction_output(sprd_3rdparty_gpio_cmmb_reset, 0);
  gpio_direction_output(spi_cs_gpio, 0);
  //gpio_direction_output(sprd_3rdparty_gpio_cmmb_power, 0);
  LDO_TurnOffLDO(LDO_LDO_RF1);
  
  LDO_SetVoltLevel(LDO_LDO_SIM3,LDO_VOLT_LEVEL3);
  LDO_TurnOffLDO(LDO_LDO_SIM3);// add by duanxufang;
  printk("maxscend:dxf,LDO_TurnOffLDO power off");
  //gpio_direction_input(mxd0251_gpio_int);
  msleep(10);
 }
 return 0;
}

/*-------------------------------------------------------------------------*/

/*
 * We can't use the standard synchronous wrappers for file I/O; we
 * need to protect against async removal of the underlying spi_device.
 */
static void mxdspidev_complete(void *arg)
{
 complete(arg);
}

static ssize_t
mxdspidev_sync(struct mxdspidev_data *mxdspidev, struct spi_message *message)
{
 DECLARE_COMPLETION_ONSTACK(done);
 int status;

 message->complete = mxdspidev_complete;
 message->context = &done;

 spin_lock_irq(&mxdspidev->spi_lock);
 if (mxdspidev->spi == NULL)
  status = -ESHUTDOWN;
 else
  status = spi_async(mxdspidev->spi, message);
 spin_unlock_irq(&mxdspidev->spi_lock);

 if (status == 0) {
  wait_for_completion(&done);
  status = message->status;
  if (status == 0)
   status = message->actual_length;
 }
 //printk("\mxdspidev_sync out!status = %d\n\n",status);
 return status;
}

static inline ssize_t
mxdspidev_sync_write(struct mxdspidev_data *mxdspidev, size_t len)
{
 struct spi_transfer t = {
   .tx_buf  = mxdspidev->buffer,
   .len  = len,
  };
 struct spi_message m;

 //printk("mxdspidev_sync_write in !\n");
 spi_message_init(&m);
 spi_message_add_tail(&t, &m);
 return mxdspidev_sync(mxdspidev, &m);
}

static inline ssize_t
mxdspidev_sync_read(struct mxdspidev_data *mxdspidev, size_t len)
{
 struct spi_transfer t = {
   .rx_buf  = mxdspidev->buffer,
   .len  = len,
  };
 struct spi_message m;

 //printk("mxdspidev_sync_read start !\n");
 spi_message_init(&m);
 spi_message_add_tail(&t, &m);
 return mxdspidev_sync(mxdspidev, &m);
}

/*-------------------------------------------------------------------------*/

/* Read-only message with current device setup */
static ssize_t
mxdspidev_read(struct file *filp, char __user *buf, size_t count, loff_t *f_pos)
{
 struct mxdspidev_data *mxdspidev;
 ssize_t   status = 0;

 /* chipselect only toggles at start or end of operation */
 if (count > bufsiz)
  return -EMSGSIZE;

 mxdspidev = filp->private_data;

 mutex_lock(&mxdspidev->buf_lock);
 status = mxdspidev_sync_read(mxdspidev, count);
 if (status > 0) {
  unsigned long missing;

  missing = copy_to_user(buf, mxdspidev->buffer, status);
  if (missing == status)
   status = -EFAULT;
  else
   status = status - missing;
 }
 mutex_unlock(&mxdspidev->buf_lock);

 return status;
}

/* Write-only message with current device setup */
static ssize_t
mxdspidev_write(struct file *filp, const char __user *buf,
  size_t count, loff_t *f_pos)
{
 struct mxdspidev_data *mxdspidev;
 ssize_t   status = 0;
 unsigned long  missing;

 /* chipselect only toggles at start or end of operation */
 if (count > bufsiz)
  return -EMSGSIZE;

 mxdspidev = filp->private_data;

 mutex_lock(&mxdspidev->buf_lock);
 missing = copy_from_user(mxdspidev->buffer, buf, count);
 if (missing == 0) {
  status = mxdspidev_sync_write(mxdspidev, count);
 } else
  status = -EFAULT;
 mutex_unlock(&mxdspidev->buf_lock);

 return status;
}

static int mxdspidev_message(struct mxdspidev_data *mxdspidev,
  struct spi_ioc_transfer *u_xfers, unsigned n_xfers)
{
 struct spi_message msg;
 struct spi_transfer *k_xfers;
 
 //struct spi_transfer *k_xfers1;
 struct spi_transfer *k_tmp;
 struct spi_ioc_transfer *u_tmp;
 unsigned  n, total;
 u8   *buf;
 int   status = -EFAULT;

 //printk("in function mxdspidev_message !\n");
 spi_message_init(&msg);
 k_xfers = kcalloc(n_xfers, sizeof(*k_tmp), GFP_KERNEL);
 if (k_xfers == NULL)
 {
  printk("kcalloc fail !!\n");
  return -ENOMEM;
 }
 /* Construct spi_message, copying any tx data to bounce buffer.
  * We walk the array of user-provided transfers, using each one
  * to initialize a kernel version of the same transfer.
  */
 buf = mxdspidev->buffer;
 total = 0;
 for (n = n_xfers, k_tmp = k_xfers, u_tmp = u_xfers;
   n;
   n--, k_tmp++, u_tmp++) {
  k_tmp->len = u_tmp->len;

  total += k_tmp->len;
  if (total > bufsiz) {
   status = -EMSGSIZE;
   printk("goto done ,starus = %d  total=%d \n",status,total);
   goto done;
  }

  if (u_tmp->rx_buf) {
   k_tmp->rx_buf = buf;
   if (!access_ok(VERIFY_WRITE, (u8 __user *)
      (uintptr_t) u_tmp->rx_buf,
      u_tmp->len)){
    printk("access_ok() not ,goto done!\n");
    goto done;}
  }
  if (u_tmp->tx_buf) {
   k_tmp->tx_buf = buf;
   if (copy_from_user(buf, (const u8 __user *)
      (uintptr_t) u_tmp->tx_buf,
     u_tmp->len)){
    printk("copy_from_user(),goto done!\n");
    goto done;}
  }
  buf += k_tmp->len;

  k_tmp->cs_change = !!u_tmp->cs_change;
  k_tmp->bits_per_word = u_tmp->bits_per_word;
  k_tmp->delay_usecs = u_tmp->delay_usecs;
  k_tmp->speed_hz = u_tmp->speed_hz;
#ifdef VERBOSE
  dev_dbg(&spi->dev,
   "  xfer len %zd %s%s%s%dbits %u usec %uHz\n",
   u_tmp->len,
   u_tmp->rx_buf ? "rx " : "",
   u_tmp->tx_buf ? "tx " : "",
   u_tmp->cs_change ? "cs " : "",
   u_tmp->bits_per_word ? : spi->bits_per_word,
   u_tmp->delay_usecs,
   u_tmp->speed_hz ? : spi->max_speed_hz);
#endif
  spi_message_add_tail(k_tmp, &msg);
 }

 status = mxdspidev_sync(mxdspidev, &msg);
 if (status < 0)
  goto done;

 /* copy any rx data out of bounce buffer */
 buf = mxdspidev->buffer;
 for (n = n_xfers, u_tmp = u_xfers; n; n--, u_tmp++) {
  if (u_tmp->rx_buf) {
   if (__copy_to_user((u8 __user *)
     (uintptr_t) u_tmp->rx_buf, buf,
     u_tmp->len)) {
    status = -EFAULT;
    goto done;
   }
  }
  buf += u_tmp->len;
 }
 status = total;

done:
 //printk("mxdspidev_message ok ,out!status = %d\n",status);
 kfree(k_xfers);
 
 //kfree(k_xfers1);
 return status;
}

static long
mxdspidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
 int   err = 0;
 int   retval = 0;
 struct mxdspidev_data *mxdspidev;
 struct spi_device *spi;
 u32   tmp;
 unsigned  n_ioc;
 struct spi_ioc_transfer *ioc;

 //printk("[kzy 12-15.4]mxdspidev_ioctl in !\n");
 /* Check type and command number */
 if (_IOC_TYPE(cmd) != SPI_IOC_MAGIC)
 {
  printk("_ioc_type(cmd) is %c,SPI_IOC_MAGIC is %c\n",_IOC_TYPE(cmd),SPI_IOC_MAGIC);
  printk("the ioctl cmd is error !\n");
  return -ENOTTY;
 }

 /* Check access direction once here; don't repeat below.
  * IOC_DIR is from the user perspective, while access_ok is
  * from the kernel perspective; so they look reversed.
  */
 if (_IOC_DIR(cmd) & _IOC_READ)
  err = !access_ok(VERIFY_WRITE,
    (void __user *)arg, _IOC_SIZE(cmd));
 if (err == 0 && _IOC_DIR(cmd) & _IOC_WRITE)
  err = !access_ok(VERIFY_READ,
    (void __user *)arg, _IOC_SIZE(cmd));
 if (err)
 {
  printk("err !!!return -EFAULT\n");
  return -EFAULT;
 }

 /* guard against device removal before, or while,
  * we issue this ioctl.
  */
 mxdspidev = filp->private_data;
 spin_lock_irq(&mxdspidev->spi_lock);
 spi = spi_dev_get(mxdspidev->spi);
 spin_unlock_irq(&mxdspidev->spi_lock);

 //printk("[kzy]mxdspidev_ioctl 1\n");
 if (spi == NULL)
 {
  printk("spi is NULL !\n");
  return -ESHUTDOWN;
 }

 /* use the buffer lock here for triple duty:
  *  - prevent I/O (from us) so calling spi_setup() is safe;
  *  - prevent concurrent SPI_IOC_WR_* from morphing
  *    data fields while SPI_IOC_RD_* reads them;
  *  - SPI_IOC_MESSAGE needs the buffer locked "normally".
  */
 mutex_lock(&mxdspidev->buf_lock);
#if 1
 switch (cmd) {
 /* read requests */
 case SPI_IOC_RD_MODE:
  retval = __put_user(spi->mode & SPI_MODE_MASK,
     (__u8 __user *)arg);
  break;
 case SPI_IOC_RD_LSB_FIRST:
  retval = __put_user((spi->mode & SPI_LSB_FIRST) ?  1 : 0,
     (__u8 __user *)arg);
  break;
 case SPI_IOC_RD_BITS_PER_WORD:
  retval = __put_user(spi->bits_per_word, (__u8 __user *)arg);
  break;
 case SPI_IOC_RD_MAX_SPEED_HZ:
  retval = __put_user(spi->max_speed_hz, (__u32 __user *)arg);
  break;

 /* write requests */
 case SPI_IOC_WR_MODE:
  retval = __get_user(tmp, (u8 __user *)arg);
  /*if (retval == 0) {
   u8 save = spi->mode;

   if (tmp & ~SPI_MODE_MASK) {
    retval = -EINVAL;
    break;
   }

   tmp |= spi->mode & ~SPI_MODE_MASK;
   spi->mode = (u8)tmp;
   retval = spi_setup(spi);
   if (retval < 0)
    spi->mode = save;
   else
    dev_dbg(&spi->dev, "spi mode %02x\n", tmp);
  }*/
  mxdspidev_sync_write(mxdspidev,32);
  break;
 case SPI_IOC_WR_LSB_FIRST:
  retval = __get_user(tmp, (__u8 __user *)arg);
  if (retval == 0) {
   u8 save = spi->mode;

   if (tmp)
    spi->mode |= SPI_LSB_FIRST;
   else
    spi->mode &= ~SPI_LSB_FIRST;
   retval = spi_setup(spi);
   if (retval < 0)
    spi->mode = save;
   else
    dev_dbg(&spi->dev, "%csb first\n",
      tmp ? 'l' : 'm');
  }
  break;
 case SPI_IOC_WR_BITS_PER_WORD:
  retval = __get_user(tmp, (__u8 __user *)arg);
  if (retval == 0) {
   u8 save = spi->bits_per_word;

   spi->bits_per_word = tmp;
   retval = spi_setup(spi);
   if (retval < 0)
    spi->bits_per_word = save;
   else
    dev_dbg(&spi->dev, "%d bits per word\n", tmp);
  }
  break;
 case SPI_IOC_WR_MAX_SPEED_HZ:
  retval = __get_user(tmp, (__u32 __user *)arg);
  if (retval == 0) {
   u32 save = spi->max_speed_hz;

   spi->max_speed_hz = tmp;
   retval = spi_setup(spi);
   if (retval < 0)
    spi->max_speed_hz = save;
   else
    dev_dbg(&spi->dev, "%d Hz (max)\n", tmp);
  }
  break;

 default:
  /* segmented and/or full-duplex I/O request */
#if 1
    if (_IOC_NR(cmd) != _IOC_NR(SPI_IOC_MESSAGE(0))
      || _IOC_DIR(cmd) != _IOC_WRITE) {
     retval = -ENOTTY;
     printk("_ioc_nr(cmd) is %d,_ioc_nr(spi_ioc_massage(0)) is %d ,_IOC_DIR(cmd) is %d\n",_IOC_NR(cmd),_IOC_NR(SPI_IOC_MESSAGE(0)),_IOC_DIR(cmd));
     printk("first if error retval = %d\n",retval);
     //break;
    }
  
    tmp = _IOC_SIZE(cmd);
    //printk("_IOC_SIZE(cmd) is %d sizeof(spi_ioc_transfer) is %d\n",tmp,sizeof(struct spi_ioc_transfer));
    if ((tmp % sizeof(struct spi_ioc_transfer)) != 0) {
     retval = -EINVAL;
     printk("second if error retval = %d\n",retval);
     //break;
    }
    n_ioc = tmp / sizeof(struct spi_ioc_transfer);
    if (n_ioc == 0){
     printk("third if error retval = %d\n",retval);
     //break;
     }
    /* copy into scratch area */
    ioc = kmalloc(tmp, GFP_KERNEL);
    if (!ioc) {
     retval = -ENOMEM;
     printk("fourth if error retval = %d\n",retval);
     //break;
    }
    if (__copy_from_user(ioc, (void __user *)arg, tmp)) {
     kfree(ioc);
     retval = -EFAULT;
     printk("fifth if error retval = %d\n",retval);
     //break;
    }
#endif
  /* translate to spi_message, execute */
  //ret = ioctl(fd_dev, SPI_IOC_MESSAGE(1), &spi_msg);
    retval = mxdspidev_message(mxdspidev, ioc, n_ioc);
  kfree(ioc);
  //mxdspidev_sync_write(mxdspidev,32);
  break;
 }
#endif
 mutex_unlock(&mxdspidev->buf_lock);
 //mxdspidev_sync_write(mxdspidev,32);
 spi_dev_put(spi);
 return retval;
}

//add by zhangbing for intr.
#ifdef __USE_EXTERNAL_INTR__
static int store_irq;
static irqreturn_t mxdspidev_irq(int irq, void *data)
{
 struct mxdspidev_data *cmmb_dev = data;
 int frame = 0;
 //printk("enter cmmb intr!\n");
 spin_lock(&cmmb_dev->spi_lock);
 /*
  * Basic frame housekeeping.
  */
 if (test_bit(frame, &cmmb_dev->irq_flag) && printk_ratelimit()) {
  /* LOG_INFO("Frame overrun on %d, frames lost\n", frame); */
  ;
 }
 set_bit(frame, &cmmb_dev->irq_flag);

 spin_unlock(&cmmb_dev->spi_lock);
 
 wake_up_interruptible(&cmmb_dev->iowait);

 return IRQ_HANDLED;
}
static unsigned int mxdspidev_poll(struct file *filp,
       struct poll_table_struct *pt)
{
 int frame = 0;
 int data_ready = 0;
 struct mxdspidev_data *cmmb_dev;
 cmmb_dev = filp->private_data;
 //printk("enter cmmb poll!\n");
 poll_wait(filp, &cmmb_dev->iowait, pt);

 spin_lock(&cmmb_dev->spi_lock); /* TODO: not need? */
 data_ready = test_and_clear_bit(frame, &cmmb_dev->irq_flag);
 spin_unlock(&cmmb_dev->spi_lock);

 if (data_ready)
  return POLLIN | POLLRDNORM;
 else
  return 0;
}
#endif

static int __init spi_module_init(void)
{
    struct spi_device *spi_dev;
 printk("spi_module_init begin !\n");
    spi_dev = sprd_spi_cmmb_device_register(-1, NULL);

    sprd_spi_tmod(spi_dev, 2);
}
static int mxdspidev_open(struct inode *inode, struct file *filp)
{
 struct mxdspidev_data *mxdspidev;
 int   status = -ENXIO;

 lock_kernel();
 mutex_lock(&device_list_lock);
 printk("liwk mxdspidev_open\n");
 comip_mxd0251_power( 1 );
 list_for_each_entry(mxdspidev, &device_list, device_entry) {
  if (mxdspidev->devt == inode->i_rdev) {
   status = 0;
   break;
  }
 }
 if (status == 0) {
  if (!mxdspidev->buffer) {
   mxdspidev->buffer = kmalloc(bufsiz, (GFP_KERNEL|GFP_DMA));
   if (!mxdspidev->buffer) {
    dev_dbg(&mxdspidev->spi->dev, "open/ENOMEM\n");
    status = -ENOMEM;
   }
  }
  if (status == 0) {
   mxdspidev->users++;
   filp->private_data = mxdspidev;
   nonseekable_open(inode, filp);
  }
 } else
  pr_debug("mxdspidev: nothing for minor %d\n", iminor(inode));

//add by zhangbing to enable intr.
#ifdef __USE_EXTERNAL_INTR__
 printk("enable irq!\n");
 enable_irq(store_irq);
#endif
 LDO_SetVoltLevel(LDO_LDO_SIM3,LDO_VOLT_LEVEL3);
 LDO_TurnOffLDO(LDO_LDO_SIM3);// add by duanxufang;
 printk("maxscend:dxf,LDO_TurnOffLDO in open 1");
 mutex_unlock(&device_list_lock);
 unlock_kernel();
 return status;
}

static int mxdspidev_release(struct inode *inode, struct file *filp)
{
 struct mxdspidev_data *mxdspidev;
 int   status = 0;

 mutex_lock(&device_list_lock);
 mxdspidev = filp->private_data;
 filp->private_data = NULL;
   printk("liwk mxdspidev_release\n");

//add by zhangbing to disable intr.
#ifdef __USE_EXTERNAL_INTR__
 printk("disable irq!\n");
 disable_irq(store_irq);
#endif

 comip_mxd0251_power(0);
 
 /* last close? */
 mxdspidev->users--;
 if (!mxdspidev->users) {
  int  dofree;

  kfree(mxdspidev->buffer);
  mxdspidev->buffer = NULL;

  /* ... after we unbound from the underlying device? */
  spin_lock_irq(&mxdspidev->spi_lock);
  dofree = (mxdspidev->spi == NULL);
  spin_unlock_irq(&mxdspidev->spi_lock);

  if (dofree)
   kfree(mxdspidev);
 }
 mutex_unlock(&device_list_lock);

 return status;
}

static struct file_operations mxdspidev_fops = {
 .owner = THIS_MODULE,
 /* REVISIT switch to aio primitives, so that userspace
  * gets more complete API coverage.  It'll simplify things
  * too, except for the locking.
  */
 .write = mxdspidev_write,
 .read =  mxdspidev_read,
 .unlocked_ioctl = mxdspidev_ioctl,
 //add by zhangbing for intr.
#ifdef __USE_EXTERNAL_INTR__
 .poll = mxdspidev_poll,
#endif
 .open =  mxdspidev_open,
 .release = mxdspidev_release,
};

#define MXD_SPI_BITS_PER_WORD     (8)
#define MXD_SPI_WORK_SPEED_HZ     (13000000)
#define MXD_SPI_INIT_SPEED_HZ     (13000000)

/*-------------------------------------------------------------------------*/

/* The main reason to have this class is to make mdev/udev create the
 * /dev/mxdspidevB.C character device nodes exposing our userspace API.
 * It also simplifies memory management.
 */

static struct class *mxdspidev_class;
struct mxd0251_platform_data {
 //int gpio_irq;
 int gpio_cs;
 int (*power)(int onoff);
};

/*-------------------------------------------------------------------------*/

static int mxdspidev_probe(struct spi_device *spi)
{
 struct mxdspidev_data *mxdspidev;
 int   status;
 unsigned long  minor;
 //struct mxd_spi_phy *phy = (struct mxd_spi_phy *)gphy;
 struct mxd0251_platform_data* pdata = spi->controller_data;
 int ret;
 int gpio_irq;
 int irq;

 if ( !pdata)
  return -EINVAL;

 /* Allocate driver data */
 mxdspidev = kzalloc(sizeof(*mxdspidev), GFP_KERNEL);
 if (!mxdspidev)
 {
  printk("kzalloc fail !!\n");
  return -ENOMEM;
 }
 
 /* Initialize the driver data */
 mxdspidev->spi = spi;
 spin_lock_init(&mxdspidev->spi_lock);
 mutex_init(&mxdspidev->buf_lock);
 INIT_LIST_HEAD(&mxdspidev->device_entry);

 printk("cmmb spi cs gpio: %d\n",pdata->gpio_cs);
 spi_cs_gpio = pdata->gpio_cs;
 if (spi_cs_gpio == 0 || spi_cs_gpio == -1)
 {
  printk("mxd spi cs pin error!\n");
  goto err_gpio;
 }
 //add by zhangbing for intr.
#ifdef __USE_EXTERNAL_INTR__
 //for cmmb wait queue.
 init_waitqueue_head(&mxdspidev->iowait);

    /* Initialize the interrupt pin for chip */
 gpio_irq = sprd_3rdparty_gpio_cmmb_irq;
 gpio_free(gpio_irq);
 ret = gpio_request(gpio_irq, "demod int");
 if (ret)
 {
  printk("mxd spi req gpio err: %d\n",gpio_irq);
  goto err_gpio;
 }

 irq = sprd_alloc_gpio_irq(gpio_irq);
 store_irq = irq;
 printk("mxd spi irq req 1:%d,%d\n",sprd_3rdparty_gpio_cmmb_irq, irq);

 gpio_direction_input(gpio_irq);
 set_irq_type(irq, IRQ_TYPE_EDGE_FALLING);
 ret = request_irq(irq, mxdspidev_irq, IRQF_TRIGGER_FALLING, "MXDSPIIRQ", mxdspidev);
 disable_irq(irq);
 if (ret)
 {
  printk("CMMB request irq failed.\n");
  goto err_irq;
 }
 printk("request_irq OK\n");
#endif
 /* If we can allocate a minor number, hook up this device.
  * Reusing minors is fine so long as udev or mdev is working.
  */
 
 mutex_lock(&device_list_lock);
 minor = find_first_zero_bit(minors, N_SPI_MINORS);
 if (minor < N_SPI_MINORS) {
  struct device *dev;
  mxdspidev->devt = MKDEV(SPIDEV_MAJOR, minor);
  dev = device_create(mxdspidev_class, &spi->dev, mxdspidev->devt,mxdspidev, "mxdspidev");
        //mxdspidev, "mxdspidev%d.%d",
        //spi->master->bus_num, spi->chip_select);
  status = IS_ERR(dev) ? PTR_ERR(dev) : 0;
 } else {
  dev_dbg(&spi->dev, "no minor number available!\n");
  status = -ENODEV;
 }
 if (status == 0) {
  set_bit(minor, minors);
  list_add(&mxdspidev->device_entry, &device_list);
 }
 mutex_unlock(&device_list_lock);
 if (status == 0)
  spi_set_drvdata(spi, mxdspidev);
 else
  kfree(mxdspidev);

       comip_mxd0251_power(0);
 return status;

err_irq:
 gpio_free(gpio_irq);
err_gpio:
 printk(" mxdspidev_probe gpio error!\n");
  
 return ret;
}

static int mxdspidev_remove(struct spi_device *spi)
{
 struct mxdspidev_data *mxdspidev = spi_get_drvdata(spi);

 /* make sure ops on existing fds can abort cleanly */
 spin_lock_irq(&mxdspidev->spi_lock);
 mxdspidev->spi = NULL;
 spi_set_drvdata(spi, NULL);
 spin_unlock_irq(&mxdspidev->spi_lock);

 /* prevent new opens */
 mutex_lock(&device_list_lock);
 list_del(&mxdspidev->device_entry);
 device_destroy(mxdspidev_class, mxdspidev->devt);
 clear_bit(MINOR(mxdspidev->devt), minors);
 if (mxdspidev->users == 0)
  kfree(mxdspidev);
 mutex_unlock(&device_list_lock);

 comip_mxd0251_power(0);

 return 0;
}

static struct spi_driver mxdspidev_spi = {
 .driver = {
  .name =  "cmmb-dev",
  .owner = THIS_MODULE,
 },
 .probe = mxdspidev_probe,
 .remove = __devexit_p(mxdspidev_remove),

 /* NOTE:  suspend/resume methods are not necessary here.
  * We don't do anything except pass the requests to/from
  * the underlying controller.  The refrigerator handles
  * most issues; the controller driver handles the rest.
  */
};

/*-------------------------------------------------------------------------*/

static int __init mxdspidev_init(void)
{
 int major;

 /* Claim our 256 reserved device numbers.  Then register a class
  * that will key udev/mdev to add/remove /dev nodes.  Last, register
  * the driver which manages those device numbers.
  */
 BUILD_BUG_ON(N_SPI_MINORS > 256);

 spi_module_init();

 major = register_chrdev(0, "spi", &mxdspidev_fops);
 if (major < 0)
 {
  printk("register_chrdev fail !!major = %d\n",major);
  return major;
 }

 SPIDEV_MAJOR = major;
 
 mxdspidev_class = class_create(THIS_MODULE, "mxdspidev");
 if (IS_ERR(mxdspidev_class)) {
  unregister_chrdev(major, mxdspidev_spi.driver.name);
  printk("class_create fail !!major = %d\n",major);
  return PTR_ERR(mxdspidev_class);
 }

 major= spi_register_driver(&mxdspidev_spi);
 if (major< 0) {
  class_destroy(mxdspidev_class);
  unregister_chrdev(major, mxdspidev_spi.driver.name);
  printk("spi_register_driver fail !!major = %d\n",major);
 }
 printk("mxdspidev_init end major=%d!\n",major);
  
 return major;
}
module_init(mxdspidev_init);

static void __exit mxdspidev_exit(void)
{
 spi_unregister_driver(&mxdspidev_spi);
 class_destroy(mxdspidev_class);
 unregister_chrdev(SPIDEV_MAJOR, mxdspidev_spi.driver.name);
}
module_exit(mxdspidev_exit);

MODULE_AUTHOR("David Jiang");
MODULE_DESCRIPTION("Maxscend User mode SPI device interface");
MODULE_LICENSE("GPL");