saa5249.c

来自「trident tm5600的linux驱动」· C语言 代码 · 共 642 行 · 第 1/2 页

		info.headline = !!(infobits[5] & 4);
		info.subtitle = !!(infobits[5] & 8);
		info.supp_header = !!(infobits[6] & 1);
		info.update = !!(infobits[6] & 2);
		info.inter_seq = !!(infobits[6] & 4);
		info.dis_disp = !!(infobits[6] & 8);
		info.serial = !!(infobits[7] & 1);
		info.notfound = !!(infobits[8] & 0x10);
		info.pblf = !!(infobits[9] & 0x20);
		info.hamming = 0;
		for (a = 0; a <= 7; a++) {
			if (infobits[a] & 0xf0) {
				info.hamming = 1;
				break;
			}
		}
		if (t->vdau[req->pgbuf].clrfound)
			info.notfound = 1;
		if (copy_to_user(req->buffer, &info, sizeof(vtx_pageinfo_t)))
			return -EFAULT;
		if (!info.hamming && !info.notfound)
			t->is_searching[req->pgbuf] = false;
		return 0;
	}

	case VTXIOCGETPAGE:
	{
		vtx_pagereq_t *req = arg;
		int start, end;

		if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS || req->start < 0 ||
			req->start > req->end || req->end >= (virtual_mode ? VTX_VIRTUALSIZE : VTX_PAGESIZE))
			return -EINVAL;
		if (copy_to_user(req->buffer, &t->vdau[req->pgbuf].pgbuf[req->start], req->end - req->start + 1))
			return -EFAULT;

		 /*
		  *	Always read the time directly from SAA5249
		  */

		if (req->start <= 39 && req->end >= 32) {
			int len;
			char buf[16];
			start = max(req->start, 32);
			end = min(req->end, 39);
			len = end - start + 1;
			if (i2c_senddata(t, 8, 0, 0, start, -1) ||
				i2c_getdata(t, len, buf))
				return -EIO;
			if (copy_to_user(req->buffer + start - req->start, buf, len))
				return -EFAULT;
		}
		/* Insert the current header if DAU is still searching for a page */
		if (req->start <= 31 && req->end >= 7 && t->is_searching[req->pgbuf]) {
			char buf[32];
			int len;

			start = max(req->start, 7);
			end = min(req->end, 31);
			len = end - start + 1;
			if (i2c_senddata(t, 8, 0, 0, start, -1) ||
				i2c_getdata(t, len, buf))
				return -EIO;
			if (copy_to_user(req->buffer + start - req->start, buf, len))
				return -EFAULT;
		}
		return 0;
	}

	case VTXIOCSTOPDAU:
	{
		vtx_pagereq_t *req = arg;

		if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
			return -EINVAL;
		t->vdau[req->pgbuf].stopped = true;
		t->is_searching[req->pgbuf] = false;
		return 0;
	}

	case VTXIOCPUTPAGE:
	case VTXIOCSETDISP:
	case VTXIOCPUTSTAT:
		return 0;

	case VTXIOCCLRCACHE:
	{
		if (i2c_senddata(t, 0, NUM_DAUS, 0, 8, -1) || i2c_senddata(t, 11,
			' ', ' ', ' ', ' ', ' ', ' ',
			' ', ' ', ' ', ' ', ' ', ' ',
			' ', ' ', ' ', ' ', ' ', ' ',
			' ', ' ', ' ', ' ', ' ', ' ',
			-1))
			return -EIO;
		if (i2c_senddata(t, 3, 0x20, -1))
			return -EIO;
		jdelay(10 * CLEAR_DELAY);			/* I have no idea how long we have to wait here */
		return 0;
	}

	case VTXIOCSETVIRT:
	{
		/* The SAA5249 has virtual-row reception turned on always */
		t->virtual_mode = (int)(long)arg;
		return 0;
	}
	}
	return -EINVAL;
}

/*
 * Translates old vtx IOCTLs to new ones
 *
 * This keeps new kernel versions compatible with old userspace programs.
 */
static inline unsigned int vtx_fix_command(unsigned int cmd)
{
	switch (cmd) {
	case VTXIOCGETINFO_OLD:
		cmd = VTXIOCGETINFO;
		break;
	case VTXIOCCLRPAGE_OLD:
		cmd = VTXIOCCLRPAGE;
		break;
	case VTXIOCCLRFOUND_OLD:
		cmd = VTXIOCCLRFOUND;
		break;
	case VTXIOCPAGEREQ_OLD:
		cmd = VTXIOCPAGEREQ;
		break;
	case VTXIOCGETSTAT_OLD:
		cmd = VTXIOCGETSTAT;
		break;
	case VTXIOCGETPAGE_OLD:
		cmd = VTXIOCGETPAGE;
		break;
	case VTXIOCSTOPDAU_OLD:
		cmd = VTXIOCSTOPDAU;
		break;
	case VTXIOCPUTPAGE_OLD:
		cmd = VTXIOCPUTPAGE;
		break;
	case VTXIOCSETDISP_OLD:
		cmd = VTXIOCSETDISP;
		break;
	case VTXIOCPUTSTAT_OLD:
		cmd = VTXIOCPUTSTAT;
		break;
	case VTXIOCCLRCACHE_OLD:
		cmd = VTXIOCCLRCACHE;
		break;
	case VTXIOCSETVIRT_OLD:
		cmd = VTXIOCSETVIRT;
		break;
	}
	return cmd;
}

/*
 *	Handle the locking
 */

static int saa5249_ioctl(struct inode *inode, struct file *file,
			 unsigned int cmd, unsigned long arg)
{
	struct saa5249_device *t = video_drvdata(file);
	int err;

	cmd = vtx_fix_command(cmd);
	mutex_lock(&t->lock);
	err = video_usercopy(inode,file,cmd,arg,do_saa5249_ioctl);
	mutex_unlock(&t->lock);
	return err;
}

static int saa5249_open(struct inode *inode, struct file *file)
{
	struct saa5249_device *t = video_drvdata(file);
	int pgbuf;

	if (t->client == NULL)
		return -ENODEV;

	if (test_and_set_bit(0, &t->in_use))
		return -EBUSY;

	if (i2c_senddata(t, 0, 0, -1) || /* Select R11 */
		/* Turn off parity checks (we do this ourselves) */
		i2c_senddata(t, 1, disp_modes[t->disp_mode][0], 0, -1) ||
		/* Display TV-picture, no virtual rows */
		i2c_senddata(t, 4, NUM_DAUS, disp_modes[t->disp_mode][1], disp_modes[t->disp_mode][2], 7, -1))
		/* Set display to page 4 */
	{
		clear_bit(0, &t->in_use);
		return -EIO;
	}

	for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++) {
		memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
		memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
		memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
		t->vdau[pgbuf].expire = 0;
		t->vdau[pgbuf].clrfound = true;
		t->vdau[pgbuf].stopped = true;
		t->is_searching[pgbuf] = false;
	}
	t->virtual_mode = false;
	return 0;
}



static int saa5249_release(struct inode *inode, struct file *file)
{
	struct saa5249_device *t = video_drvdata(file);

	i2c_senddata(t, 1, 0x20, -1);		/* Turn off CCT */
	i2c_senddata(t, 5, 3, 3, -1);		/* Turn off TV-display */
	clear_bit(0, &t->in_use);
	return 0;
}

static const struct file_operations saa_fops = {
	.owner		= THIS_MODULE,
	.open		= saa5249_open,
	.release       	= saa5249_release,
	.ioctl          = saa5249_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= v4l_compat_ioctl32,
#endif
	.llseek         = no_llseek,
};

static struct video_device saa_template =
{
	.name		= "saa5249",
	.fops           = &saa_fops,
	.release 	= video_device_release,
};

/* Addresses to scan */
static unsigned short normal_i2c[] = { 0x22 >> 1, I2C_CLIENT_END };

I2C_CLIENT_INSMOD;

static int saa5249_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	int pgbuf;
	int err;
	struct video_device *vd;
	struct saa5249_device *t;

	v4l_info(client, "chip found @ 0x%x (%s)\n",
			client->addr << 1, client->adapter->name);
	v4l_info(client, "VideoText version %d.%d\n",
			VTX_VER_MAJ, VTX_VER_MIN);
	t = kzalloc(sizeof(*t), GFP_KERNEL);
	if (t == NULL)
		return -ENOMEM;
	mutex_init(&t->lock);

	/* Now create a video4linux device */
	vd = kmalloc(sizeof(struct video_device), GFP_KERNEL);
	if (vd == NULL) {
		kfree(client);
		return -ENOMEM;
	}
	i2c_set_clientdata(client, vd);
	memcpy(vd, &saa_template, sizeof(*vd));

	for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++) {
		memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
		memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
		memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
		t->vdau[pgbuf].expire = 0;
		t->vdau[pgbuf].clrfound = true;
		t->vdau[pgbuf].stopped = true;
		t->is_searching[pgbuf] = false;
	}
	video_set_drvdata(vd, t);

	/* Register it */
	err = video_register_device(vd, VFL_TYPE_VTX, -1);
	if (err < 0) {
		kfree(t);
		kfree(vd);
		return err;
	}
	t->client = client;
	return 0;
}

static int saa5249_remove(struct i2c_client *client)
{
	struct video_device *vd = i2c_get_clientdata(client);

	video_unregister_device(vd);
	kfree(video_get_drvdata(vd));
	kfree(vd);
	return 0;
}

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 26)
static const struct i2c_device_id saa5249_id[] = {
	{ "saa5249", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, saa5249_id);
#endif

static struct v4l2_i2c_driver_data v4l2_i2c_data = {
	.name = "saa5249",
	.driverid = I2C_DRIVERID_SAA5249,
	.probe = saa5249_probe,
	.remove = saa5249_remove,
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 26)
	.id_table = saa5249_id,
#endif
};