working on sensor ports i2c

#define DRV_NAME "elphel_sensor_i2c"

//------------------

#if 0

#include <linux/fs.h>

/**

 * alloc_chrdev_region() - register a range of char device numbers

 * @dev: output parameter for first assigned number

 * @baseminor: first of the requested range of minor numbers

 * @count: the number of minor numbers required

 * @name: the name of the associated device or driver

 *

 * Allocates a range of char device numbers.  The major number will be

 * chosen dynamically, and returned (along with the first minor number)

 * in @dev.  Returns zero or a negative error code.

 */

int alloc_chrdev_region(dev_t *dev, unsigned baseminor, unsigned count,

			const char *name)

{

	struct char_device_struct *cd;

	cd = __register_chrdev_region(0, baseminor, count, name);

	if (IS_ERR(cd))

		return PTR_ERR(cd);

	*dev = MKDEV(cd->major, cd->baseminor);

	return 0;

}

#endif

// Number of channels is hard-wired to 4

static u32 free_i2c_groups[4];

static u32 free_i2c_pages [32];

*  along with this program.  If not, see <http://www.gnu.org/licenses/>.

*******************************************************************************/

// I2C device description to be used with i2c sequencer

/*

typedef struct x393_i2c_device_tag{

	      char *                       name;

	      u8                           slave7; // slave address (7-bit)

	      u8                           address_bytes;

	      u8                           data_bytes;

	      int                          scl_khz; // maximal SCL frequency in KHz (currently limited by 200KHz slowest)

	      struct x393_i2c_device_tag * next;

} x393_i2c_device_t;

*/

/* Reserve i2c page (1 of 256 for a sensor port)*/

int i2c_page_alloc(int chn);