Logo Search packages:      
Sourcecode: linux version File versions  Download package

dibx000_common.c

#include <linux/i2c.h>

#include "dibx000_common.h"

static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "turn on debugging (default: 0)");

#define dprintk(args...) do { if (debug) { printk(KERN_DEBUG "DiBX000: "); printk(args); } } while (0)

static int dibx000_write_word(struct dibx000_i2c_master *mst, u16 reg, u16 val)
{
      u8 b[4] = {
            (reg >> 8) & 0xff, reg & 0xff,
            (val >> 8) & 0xff, val & 0xff,
      };
      struct i2c_msg msg = {
            .addr = mst->i2c_addr, .flags = 0, .buf = b, .len = 4
      };
      return i2c_transfer(mst->i2c_adap, &msg, 1) != 1 ? -EREMOTEIO : 0;
}


static int dibx000_i2c_select_interface(struct dibx000_i2c_master *mst, enum dibx000_i2c_interface intf)
{
      if (mst->device_rev > DIB3000MC && mst->selected_interface != intf) {
            dprintk("selecting interface: %d\n",intf);
            mst->selected_interface = intf;
            return dibx000_write_word(mst, mst->base_reg + 4, intf);
      }
      return 0;
}

static int dibx000_i2c_gate_ctrl(struct dibx000_i2c_master *mst, u8 tx[4], u8 addr, int onoff)
{
      u16 val;


      if (onoff)
            val = addr << 8; // bit 7 = use master or not, if 0, the gate is open
      else
            val = 1 << 7;

      if (mst->device_rev > DIB7000)
            val <<= 1;

      tx[0] = (((mst->base_reg + 1) >> 8) & 0xff);
      tx[1] = ( (mst->base_reg + 1)       & 0xff);
      tx[2] = val >> 8;
      tx[3] = val & 0xff;

      return 0;
}

static u32 dibx000_i2c_func(struct i2c_adapter *adapter)
{
      return I2C_FUNC_I2C;
}

static int dibx000_i2c_gated_tuner_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msg[], int num)
{
      struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
      struct i2c_msg m[2 + num];
      u8 tx_open[4], tx_close[4];

      memset(m,0, sizeof(struct i2c_msg) * (2 + num));

      dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_TUNER);

      dibx000_i2c_gate_ctrl(mst, tx_open,  msg[0].addr, 1);
      m[0].addr = mst->i2c_addr;
      m[0].buf  = tx_open;
      m[0].len  = 4;

      memcpy(&m[1], msg, sizeof(struct i2c_msg) * num);

      dibx000_i2c_gate_ctrl(mst, tx_close, 0, 0);
      m[num+1].addr = mst->i2c_addr;
      m[num+1].buf  = tx_close;
      m[num+1].len  = 4;

      return i2c_transfer(mst->i2c_adap, m, 2+num) == 2 + num ? num : -EIO;
}

static struct i2c_algorithm dibx000_i2c_gated_tuner_algo = {
      .master_xfer   = dibx000_i2c_gated_tuner_xfer,
      .functionality = dibx000_i2c_func,
};

struct i2c_adapter * dibx000_get_i2c_adapter(struct dibx000_i2c_master *mst, enum dibx000_i2c_interface intf, int gating)
{
      struct i2c_adapter *i2c = NULL;

      switch (intf) {
            case DIBX000_I2C_INTERFACE_TUNER:
                  if (gating)
                        i2c = &mst->gated_tuner_i2c_adap;
                  break;
            default:
                  printk(KERN_ERR "DiBX000: incorrect I2C interface selected\n");
                  break;
      }

      return i2c;
}
EXPORT_SYMBOL(dibx000_get_i2c_adapter);

static int i2c_adapter_init(struct i2c_adapter *i2c_adap, struct i2c_algorithm *algo, const char *name, struct dibx000_i2c_master *mst)
{
      strncpy(i2c_adap->name, name, sizeof(i2c_adap->name));
      i2c_adap->class     = I2C_CLASS_TV_DIGITAL,
      i2c_adap->algo      = algo;
      i2c_adap->algo_data = NULL;
      i2c_set_adapdata(i2c_adap, mst);
      if (i2c_add_adapter(i2c_adap) < 0)
            return -ENODEV;
      return 0;
}

int dibx000_init_i2c_master(struct dibx000_i2c_master *mst, u16 device_rev, struct i2c_adapter *i2c_adap, u8 i2c_addr)
{
      u8 tx[4];
      struct i2c_msg m = { .addr = i2c_addr >> 1, .buf = tx, .len = 4 };

      mst->device_rev = device_rev;
      mst->i2c_adap   = i2c_adap;
      mst->i2c_addr   = i2c_addr >> 1;

      if (device_rev == DIB7000P)
            mst->base_reg = 1024;
      else
            mst->base_reg = 768;

    if (i2c_adapter_init(&mst->gated_tuner_i2c_adap, &dibx000_i2c_gated_tuner_algo, "DiBX000 tuner I2C bus", mst) != 0)
            printk(KERN_ERR "DiBX000: could not initialize the tuner i2c_adapter\n");

      /* initialize the i2c-master by closing the gate */
      dibx000_i2c_gate_ctrl(mst, tx, 0, 0);

      return i2c_transfer(i2c_adap, &m, 1) == 1;
}
EXPORT_SYMBOL(dibx000_init_i2c_master);

void dibx000_exit_i2c_master(struct dibx000_i2c_master *mst)
{
      i2c_del_adapter(&mst->gated_tuner_i2c_adap);
}
EXPORT_SYMBOL(dibx000_exit_i2c_master);

MODULE_AUTHOR("Patrick Boettcher <pboettcher@dibcom.fr>");
MODULE_DESCRIPTION("Common function the DiBcom demodulator family");
MODULE_LICENSE("GPL");

Generated by  Doxygen 1.6.0   Back to index