cafe_ccic.c

linux 内核源代码

 * This template device holds all of those v4l2 methods; we
 * clone it for specific real devices.
 */

static const struct file_operations cafe_v4l_fops = {
	.owner = THIS_MODULE,
	.open = cafe_v4l_open,
	.release = cafe_v4l_release,
	.read = cafe_v4l_read,
	.poll = cafe_v4l_poll,
	.mmap = cafe_v4l_mmap,
	.ioctl = video_ioctl2,
	.llseek = no_llseek,
};

static struct video_device cafe_v4l_template = {
	.name = "cafe",
	.type = VFL_TYPE_GRABBER,
	.type2 = VID_TYPE_CAPTURE,
	.minor = -1, /* Get one dynamically */
	.tvnorms = V4L2_STD_NTSC_M,
	.current_norm = V4L2_STD_NTSC_M,  /* make mplayer happy */

	.fops = &cafe_v4l_fops,
	.release = cafe_v4l_dev_release,

	.vidioc_querycap 	= cafe_vidioc_querycap,
	.vidioc_enum_fmt_cap	= cafe_vidioc_enum_fmt_cap,
	.vidioc_try_fmt_cap	= cafe_vidioc_try_fmt_cap,
	.vidioc_s_fmt_cap	= cafe_vidioc_s_fmt_cap,
	.vidioc_g_fmt_cap	= cafe_vidioc_g_fmt_cap,
	.vidioc_enum_input	= cafe_vidioc_enum_input,
	.vidioc_g_input		= cafe_vidioc_g_input,
	.vidioc_s_input		= cafe_vidioc_s_input,
	.vidioc_s_std		= cafe_vidioc_s_std,
	.vidioc_reqbufs		= cafe_vidioc_reqbufs,
	.vidioc_querybuf	= cafe_vidioc_querybuf,
	.vidioc_qbuf		= cafe_vidioc_qbuf,
	.vidioc_dqbuf		= cafe_vidioc_dqbuf,
	.vidioc_streamon	= cafe_vidioc_streamon,
	.vidioc_streamoff	= cafe_vidioc_streamoff,
	.vidioc_queryctrl	= cafe_vidioc_queryctrl,
	.vidioc_g_ctrl		= cafe_vidioc_g_ctrl,
	.vidioc_s_ctrl		= cafe_vidioc_s_ctrl,
	.vidioc_g_parm		= cafe_vidioc_g_parm,
	.vidioc_s_parm		= cafe_vidioc_s_parm,
};







/* ---------------------------------------------------------------------- */
/*
 * Interrupt handler stuff
 */



static void cafe_frame_tasklet(unsigned long data)
{
	struct cafe_camera *cam = (struct cafe_camera *) data;
	int i;
	unsigned long flags;
	struct cafe_sio_buffer *sbuf;

	spin_lock_irqsave(&cam->dev_lock, flags);
	for (i = 0; i < cam->nbufs; i++) {
		int bufno = cam->next_buf;
		if (bufno < 0) {  /* "will never happen" */
			cam_err(cam, "No valid bufs in tasklet!\n");
			break;
		}
		if (++(cam->next_buf) >= cam->nbufs)
			cam->next_buf = 0;
		if (! test_bit(bufno, &cam->flags))
			continue;
		if (list_empty(&cam->sb_avail))
			break;  /* Leave it valid, hope for better later */
		clear_bit(bufno, &cam->flags);
		sbuf = list_entry(cam->sb_avail.next,
				struct cafe_sio_buffer, list);
		/*
		 * Drop the lock during the big copy.  This *should* be safe...
		 */
		spin_unlock_irqrestore(&cam->dev_lock, flags);
		memcpy(sbuf->buffer, cam->dma_bufs[bufno],
				cam->pix_format.sizeimage);
		sbuf->v4lbuf.bytesused = cam->pix_format.sizeimage;
		sbuf->v4lbuf.sequence = cam->buf_seq[bufno];
		sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
		sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
		spin_lock_irqsave(&cam->dev_lock, flags);
		list_move_tail(&sbuf->list, &cam->sb_full);
	}
	if (! list_empty(&cam->sb_full))
		wake_up(&cam->iowait);
	spin_unlock_irqrestore(&cam->dev_lock, flags);
}



static void cafe_frame_complete(struct cafe_camera *cam, int frame)
{
	/*
	 * Basic frame housekeeping.
	 */
	if (test_bit(frame, &cam->flags) && printk_ratelimit())
		cam_err(cam, "Frame overrun on %d, frames lost\n", frame);
	set_bit(frame, &cam->flags);
	clear_bit(CF_DMA_ACTIVE, &cam->flags);
	if (cam->next_buf < 0)
		cam->next_buf = frame;
	cam->buf_seq[frame] = ++(cam->sequence);

	switch (cam->state) {
	/*
	 * If in single read mode, try going speculative.
	 */
	    case S_SINGLEREAD:
		cam->state = S_SPECREAD;
		cam->specframes = 0;
		wake_up(&cam->iowait);
		break;

	/*
	 * If we are already doing speculative reads, and nobody is
	 * reading them, just stop.
	 */
	    case S_SPECREAD:
		if (++(cam->specframes) >= cam->nbufs) {
			cafe_ctlr_stop(cam);
			cafe_ctlr_irq_disable(cam);
			cam->state = S_IDLE;
		}
		wake_up(&cam->iowait);
		break;
	/*
	 * For the streaming case, we defer the real work to the
	 * camera tasklet.
	 *
	 * FIXME: if the application is not consuming the buffers,
	 * we should eventually put things on hold and restart in
	 * vidioc_dqbuf().
	 */
	    case S_STREAMING:
		tasklet_schedule(&cam->s_tasklet);
		break;

	    default:
		cam_err(cam, "Frame interrupt in non-operational state\n");
		break;
	}
}




static void cafe_frame_irq(struct cafe_camera *cam, unsigned int irqs)
{
	unsigned int frame;

	cafe_reg_write(cam, REG_IRQSTAT, FRAMEIRQS); /* Clear'em all */
	/*
	 * Handle any frame completions.  There really should
	 * not be more than one of these, or we have fallen
	 * far behind.
	 */
	for (frame = 0; frame < cam->nbufs; frame++)
		if (irqs & (IRQ_EOF0 << frame))
			cafe_frame_complete(cam, frame);
	/*
	 * If a frame starts, note that we have DMA active.  This
	 * code assumes that we won't get multiple frame interrupts
	 * at once; may want to rethink that.
	 */
	if (irqs & (IRQ_SOF0 | IRQ_SOF1 | IRQ_SOF2))
		set_bit(CF_DMA_ACTIVE, &cam->flags);
}



static irqreturn_t cafe_irq(int irq, void *data)
{
	struct cafe_camera *cam = data;
	unsigned int irqs;

	spin_lock(&cam->dev_lock);
	irqs = cafe_reg_read(cam, REG_IRQSTAT);
	if ((irqs & ALLIRQS) == 0) {
		spin_unlock(&cam->dev_lock);
		return IRQ_NONE;
	}
	if (irqs & FRAMEIRQS)
		cafe_frame_irq(cam, irqs);
	if (irqs & TWSIIRQS) {
		cafe_reg_write(cam, REG_IRQSTAT, TWSIIRQS);
		wake_up(&cam->smbus_wait);
	}
	spin_unlock(&cam->dev_lock);
	return IRQ_HANDLED;
}


/* -------------------------------------------------------------------------- */
#ifdef CONFIG_VIDEO_ADV_DEBUG
/*
 * Debugfs stuff.
 */

static char cafe_debug_buf[1024];
static struct dentry *cafe_dfs_root;

static void cafe_dfs_setup(void)
{
	cafe_dfs_root = debugfs_create_dir("cafe_ccic", NULL);
	if (IS_ERR(cafe_dfs_root)) {
		cafe_dfs_root = NULL;  /* Never mind */
		printk(KERN_NOTICE "cafe_ccic unable to set up debugfs\n");
	}
}

static void cafe_dfs_shutdown(void)
{
	if (cafe_dfs_root)
		debugfs_remove(cafe_dfs_root);
}

static int cafe_dfs_open(struct inode *inode, struct file *file)
{
	file->private_data = inode->i_private;
	return 0;
}

static ssize_t cafe_dfs_read_regs(struct file *file,
		char __user *buf, size_t count, loff_t *ppos)
{
	struct cafe_camera *cam = file->private_data;
	char *s = cafe_debug_buf;
	int offset;

	for (offset = 0; offset < 0x44; offset += 4)
		s += sprintf(s, "%02x: %08x\n", offset,
				cafe_reg_read(cam, offset));
	for (offset = 0x88; offset <= 0x90; offset += 4)
		s += sprintf(s, "%02x: %08x\n", offset,
				cafe_reg_read(cam, offset));
	for (offset = 0xb4; offset <= 0xbc; offset += 4)
		s += sprintf(s, "%02x: %08x\n", offset,
				cafe_reg_read(cam, offset));
	for (offset = 0x3000; offset <= 0x300c; offset += 4)
		s += sprintf(s, "%04x: %08x\n", offset,
				cafe_reg_read(cam, offset));
	return simple_read_from_buffer(buf, count, ppos, cafe_debug_buf,
			s - cafe_debug_buf);
}

static const struct file_operations cafe_dfs_reg_ops = {
	.owner = THIS_MODULE,
	.read = cafe_dfs_read_regs,
	.open = cafe_dfs_open
};

static ssize_t cafe_dfs_read_cam(struct file *file,
		char __user *buf, size_t count, loff_t *ppos)
{
	struct cafe_camera *cam = file->private_data;
	char *s = cafe_debug_buf;
	int offset;

	if (! cam->sensor)
		return -EINVAL;
	for (offset = 0x0; offset < 0x8a; offset++)
	{
		u8 v;

		cafe_smbus_read_data(cam, cam->sensor->addr, offset, &v);
		s += sprintf(s, "%02x: %02x\n", offset, v);
	}
	return simple_read_from_buffer(buf, count, ppos, cafe_debug_buf,
			s - cafe_debug_buf);
}

static const struct file_operations cafe_dfs_cam_ops = {
	.owner = THIS_MODULE,
	.read = cafe_dfs_read_cam,
	.open = cafe_dfs_open
};



static void cafe_dfs_cam_setup(struct cafe_camera *cam)
{
	char fname[40];

	if (!cafe_dfs_root)
		return;
	sprintf(fname, "regs-%d", cam->v4ldev.minor);
	cam->dfs_regs = debugfs_create_file(fname, 0444, cafe_dfs_root,
			cam, &cafe_dfs_reg_ops);
	sprintf(fname, "cam-%d", cam->v4ldev.minor);
	cam->dfs_cam_regs = debugfs_create_file(fname, 0444, cafe_dfs_root,
			cam, &cafe_dfs_cam_ops);
}


static void cafe_dfs_cam_shutdown(struct cafe_camera *cam)
{
	if (! IS_ERR(cam->dfs_regs))
		debugfs_remove(cam->dfs_regs);
	if (! IS_ERR(cam->dfs_cam_regs))
		debugfs_remove(cam->dfs_cam_regs);
}

#else

#define cafe_dfs_setup()
#define cafe_dfs_shutdown()
#define cafe_dfs_cam_setup(cam)
#define cafe_dfs_cam_shutdown(cam)
#endif    /* CONFIG_VIDEO_ADV_DEBUG */




/* ------------------------------------------------------------------------*/
/*
 * PCI interface stuff.
 */

static int cafe_pci_probe(struct pci_dev *pdev,
		const struct pci_device_id *id)
{
	int ret;
	u16 classword;
	struct cafe_camera *cam;
	/*
	 * Make sure we have a camera here - we'll get calls for
	 * the other cafe devices as well.
	 */
	pci_read_config_word(pdev, PCI_CLASS_DEVICE, &classword);
	if (classword != PCI_CLASS_MULTIMEDIA_VIDEO)
		return -ENODEV;
	/*
	 * Start putting together one of our big camera structures.
	 */
	ret = -ENOMEM;
	cam = kzalloc(sizeof(struct cafe_camera), GFP_KERNEL);
	if (cam == NULL)
		goto out;
	mutex_init(&cam->s_mutex);
	mutex_lock(&cam->s_mutex);
	spin_lock_init(&cam->dev_lock);
	cam->state = S_NOTREADY;
	cafe_set_config_needed(cam, 1);
	init_waitqueue_head(&cam->smbus_wait);
	init_waitqueue_head(&cam->iowait);
	cam->pdev = pdev;
	cam->pix_format = cafe_def_pix_format;
	INIT_LIST_HEAD(&cam->dev_list);
	INIT_LIST_HEAD(&cam->sb_avail);
	INIT_LIST_HEAD(&cam->sb_full);
	tasklet_init(&cam->s_tasklet, cafe_frame_tasklet, (unsigned long) cam);
	/*
	 * Get set up on the PCI bus.
	 */
	ret = pci_enable_device(pdev);
	if (ret)
		goto out_free;
	pci_set_master(pdev);

	ret = -EIO;
	cam->regs = pci_iomap(pdev, 0, 0);
	if (! cam->regs) {
		printk(KERN_ERR "Unable to ioremap cafe-ccic regs\n");
		goto out_free;
	}
	ret = request_irq(pdev->irq, cafe_irq, IRQF_SHARED, "cafe-ccic", cam);
	if (ret)
		goto out_iounmap;
	/*
	 * Initialize the controller and leave it powered up.  It will
	 * stay that way until the sensor driver shows up.
	 */
	cafe_ctlr_init(cam);
	cafe_ctlr_power_up(cam);
	/*
	 * Set up I2C/SMBUS communications.  We have to drop the mutex here
	 * because the sensor could attach in this call chain, leading to
	 * unsightly deadlocks.
	 */
	mutex_unlock(&cam->s_mutex);  /* attach can deadlock */
	ret = cafe_smbus_setup(cam);
	if (ret)
		goto out_freeirq;
	/*
	 * Get the v4l2 setup done.
	 */
	mutex_lock(&cam->s_mutex);
	cam->v4ldev = cafe_v4l_template;
	cam->v4ldev.debug = 0;
//	cam->v4ldev.debug = V4L2_DEBUG_IOCTL_ARG;
	cam->v4ldev.dev = &pdev->dev;
	ret = video_register_device(&cam->v4ldev, VFL_TYPE_GRABBER, -1);
	if (ret)
		goto out_smbus;
	/*
	 * If so requested, try to get our DMA buffers now.
	 */
	if (!alloc_bufs_at_read) {
		if (cafe_alloc_dma_bufs(cam, 1))
			cam_warn(cam, "Unable to alloc DMA buffers at load"
					" will try again later.");
	}

	cafe_dfs_cam_setup(cam);
	mutex_unlock(&cam->s_mutex);
	cafe_add_dev(cam);
	return 0;

  out_smbus:
	cafe_smbus_shutdown(cam);
  out_freeirq:
	cafe_ctlr_power_down(cam);
	free_irq(pdev->irq, cam);
  out_iounmap:
	pci_iounmap(pdev, cam->regs);
  out_free:
	kfree(cam);
  out:
	return ret;
}


/*
 * Shut down an initialized device
 */
static void cafe_shutdown(struct cafe_camera *cam)
{
/* FIXME: Make sure we take care of everything here */
	cafe_dfs_cam_shutdown(cam);
	if (cam->n_sbufs > 0)
		/* What if they are still mapped?  Shouldn't be, but... */
		cafe_free_sio_buffers(cam);
	cafe_remove_dev(cam);
	cafe_ctlr_stop_dma(cam);
	cafe_ctlr_power_down(cam);
	cafe_smbus_shutdown(cam);
	cafe_free_dma_bufs(cam);
	free_irq(cam->pdev->irq, cam);
	pci_iounmap(cam->pdev, cam->regs);
	video_unregister_device(&cam->v4ldev);
	/* kfree(cam); done in v4l_release () */
}


static void cafe_pci_remove(struct pci_dev *pdev)
{
	struct cafe_camera *cam = cafe_find_by_pdev(pdev);

	if (cam == NULL) {
		printk(KERN_WARNING "pci_remove on unknown pdev %p\n", pdev);
		return;
	}
	mutex_lock(&cam->s_mutex);
	if (cam->users > 0)
		cam_warn(cam, "Removing a device with users!\n");
	cafe_shutdown(cam);
/* No unlock - it no longer exists */
}


#ifdef CONFIG_PM
/*
 * Basic power management.
 */
static int cafe_pci_suspend(struct pci_dev *pdev, pm_message_t state)
{
	struct cafe_camera *cam = cafe_find_by_pdev(pdev);
	int ret;
	enum cafe_state cstate;

	ret = pci_save_state(pdev);
	if (ret)
		return ret;
	cstate = cam->state; /* HACK - stop_dma sets to idle */
	cafe_ctlr_stop_dma(cam);
	cafe_ctlr_power_down(cam);
	pci_disable_device(pdev);
	cam->state = cstate;
	return 0;
}


static int cafe_pci_resume(struct pci_dev *pdev)
{
	struct cafe_camera *cam = cafe_find_by_pdev(pdev);
	int ret = 0;

	ret = pci_restore_state(pdev);
	if (ret)
		return ret;
	ret = pci_enable_device(pdev);

	if (ret) {
		cam_warn(cam, "Unable to re-enable device on resume!\n");
		return ret;
	}
	cafe_ctlr_init(cam);
	cafe_ctlr_power_down(cam);

	mutex_lock(&cam->s_mutex);
	if (cam->users > 0) {
		cafe_ctlr_power_up(cam);
		__cafe_cam_reset(cam);
	}
	mutex_unlock(&cam->s_mutex);

	set_bit(CF_CONFIG_NEEDED, &cam->flags);
	if (cam->state == S_SPECREAD)
		cam->state = S_IDLE;  /* Don't bother restarting */
	else if (cam->state == S_SINGLEREAD || cam->state == S_STREAMING)
		ret = cafe_read_setup(cam, cam->state);
	return ret;
}

#endif  /* CONFIG_PM */


static struct pci_device_id cafe_ids[] = {
	{ PCI_DEVICE(0x11ab, 0x4100) }, /* Eventual real ID */
	{ PCI_DEVICE(0x11ab, 0x4102) }, /* Really eventual real ID */
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, cafe_ids);

static struct pci_driver cafe_pci_driver = {
	.name = "cafe1000-ccic",
	.id_table = cafe_ids,
	.probe = cafe_pci_probe,
	.remove = cafe_pci_remove,
#ifdef CONFIG_PM
	.suspend = cafe_pci_suspend,
	.resume = cafe_pci_resume,
#endif
};




static int __init cafe_init(void)
{
	int ret;

	printk(KERN_NOTICE "Marvell M88ALP01 'CAFE' Camera Controller version %d\n",
			CAFE_VERSION);
	cafe_dfs_setup();
	ret = pci_register_driver(&cafe_pci_driver);
	if (ret) {
		printk(KERN_ERR "Unable to register cafe_ccic driver\n");
		goto out;
	}
	request_module("ov7670");  /* FIXME want something more general */
	ret = 0;

  out:
	return ret;
}


static void __exit cafe_exit(void)
{
	pci_unregister_driver(&cafe_pci_driver);
	cafe_dfs_shutdown();
}

module_init(cafe_init);
module_exit(cafe_exit);