linux-imx

/*

    Driver for SAA6588 RDS decoder

​

    (c) 2005 Hans J. Koch

​

    This program is free software; you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation; either version 2 of the License, or

    (at your option) any later version.

​

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

​

    You should have received a copy of the GNU General Public License

    along with this program; if not, write to the Free Software

    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

​

​

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/i2c.h>

#include <linux/types.h>

#include <linux/videodev2.h>

#include <linux/init.h>

#include <linux/errno.h>

#include <linux/slab.h>

#include <linux/poll.h>

#include <linux/wait.h>

#include <linux/uaccess.h>

​

#include <media/i2c/saa6588.h>

#include <media/v4l2-device.h>

​

​

/* insmod options */

static unsigned int debug;

static unsigned int xtal;

static unsigned int mmbs;

static unsigned int plvl;

static unsigned int bufblocks = 100;

​

module_param(debug, int, 0644);

MODULE_PARM_DESC(debug, "enable debug messages");

module_param(xtal, int, 0);

MODULE_PARM_DESC(xtal, "select oscillator frequency (0..3), default 0");

module_param(mmbs, int, 0);

MODULE_PARM_DESC(mmbs, "enable MMBS mode: 0=off (default), 1=on");

module_param(plvl, int, 0);

MODULE_PARM_DESC(plvl, "select pause level (0..3), default 0");

module_param(bufblocks, int, 0);

MODULE_PARM_DESC(bufblocks, "number of buffered blocks, default 100");

​

MODULE_DESCRIPTION("v4l2 driver module for SAA6588 RDS decoder");

MODULE_AUTHOR("Hans J. Koch <koch@hjk-az.de>");

​

MODULE_LICENSE("GPL");

​

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

​

#define UNSET       (-1U)

#define PREFIX      "saa6588: "

#define dprintk     if (debug) printk

​

struct saa6588 {

    struct v4l2_subdev sd;

    struct delayed_work work;

    spinlock_t lock;

    unsigned char *buffer;

    unsigned int buf_size;

    unsigned int rd_index;

    unsigned int wr_index;

    unsigned int block_count;

    unsigned char last_blocknum;

    wait_queue_head_t read_queue;

    int data_available_for_read;

    u8 sync;

};

​

static inline struct saa6588 *to_saa6588(struct v4l2_subdev *sd)

{

    return container_of(sd, struct saa6588, sd);

}

​

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

​

/*

 * SAA6588 defines

 */

​