path: root/drivers/media/video/pms.c

/*
 *	Media Vision Pro Movie Studio
 *			or
 *	"all you need is an I2C bus some RAM and a prayer"
 *
 *	This draws heavily on code
 *
 *	(c) Wolfgang Koehler,  wolf@first.gmd.de, Dec. 1994
 *	Kiefernring 15
 *	14478 Potsdam, Germany
 *
 *	Most of this code is directly derived from his userspace driver.
 *	His driver works so send any reports to alan@lxorguk.ukuu.org.uk
 *	unless the userspace driver also doesn't work for you...
 *
 *      Changes:
 *	25-11-2009 	Hans Verkuil <hverkuil@xs4all.nl>
 * 			- converted to version 2 of the V4L API.
 *      08/07/2003      Daniele Bellucci <bellucda@tiscali.it>
 *                      - pms_capture: report back -EFAULT
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/version.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <asm/io.h>

#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-device.h>

MODULE_LICENSE("GPL");


#define MOTOROLA	1
#define PHILIPS2	2               /* SAA7191 */
#define PHILIPS1	3
#define MVVMEMORYWIDTH	0x40		/* 512 bytes */

struct i2c_info {
	u8 slave;
	u8 sub;
	u8 data;
	u8 hits;
};

struct pms {
	struct v4l2_device v4l2_dev;
	struct video_device vdev;
	int height;
	int width;
	int depth;
	int input;
	s32 brightness, saturation, hue, contrast;
	struct mutex lock;
	int i2c_count;
	struct i2c_info i2cinfo[64];

	int decoder;
	int standard;	/* 0 - auto 1 - ntsc 2 - pal 3 - secam */
	v4l2_std_id std;
	int io;
	int data;
	void __iomem *mem;
};

static struct pms pms_card;

/*
 *	I/O ports and Shared Memory
 */

static int io_port = 0x250;
module_param(io_port, int, 0);

static int mem_base = 0xc8000;
module_param(mem_base, int, 0);

static int video_nr = -1;
module_param(video_nr, int, 0);


static inline void mvv_write(struct pms *dev, u8 index, u8 value)
{
	outw(index | (value << 8), dev->io);
}

static inline u8 mvv_read(struct pms *dev, u8 index)
{
	outb(index, dev->io);
	return inb(dev->data);
}

static int pms_i2c_stat(struct pms *dev, u8 slave)
{
	int counter = 0;
	int i;

	outb(0x28, dev->io);

	while ((inb(dev->data) & 0x01) == 0)
		if (counter++ == 256)
			break;

	while ((inb(dev->data) & 0x01) != 0)
		if (counter++ == 256)
			break;

	outb(slave, dev->io);

	counter = 0;
	while ((inb(dev->data) & 0x01) == 0)
		if (counter++ == 256)
			break;

	while ((inb(dev->data) & 0x01) != 0)
		if (counter++ == 256)
			break;

	for (i = 0; i < 12; i++) {
		char st = inb(dev->data);

		if ((st & 2) != 0)
			return -1;
		if ((st & 1) == 0)