/*
* camif_open()
*/
static int camif_open(struct inode *inode, struct file *file)
{
struct s3c2440camif_dev *pdev;
struct s3c2440camif_fh *fh;
int ret;
if (!has_ov9650) {
return -ENODEV;
}
pdev = &camera;
fh = kzalloc(sizeof(*fh),GFP_KERNEL); // alloc memory for filehandle
if (NULL == fh)
{
return -ENOMEM;
}
fh->dev = pdev;
pdev->state = CAMIF_STATE_READY;
init_camif_config(fh);
ret = init_image_buffer(); // init image buffer.
if (ret < 0)
{
goto error1;
}
request_irq(IRQ_S3C2440_CAM_C, on_camif_irq_c, IRQF_DISABLED, "CAM_C", pdev); // setup ISRs
if (ret < 0)
{
goto error2;
}
request_irq(IRQ_S3C2440_CAM_P, on_camif_irq_p, IRQF_DISABLED, "CAM_P", pdev);
if (ret < 0)
{
goto error3;
}
clk_enable(pdev->clk); // and enable camif clock.
soft_reset_camif();
file->private_data = fh;
fh->dev = pdev;
update_camif_config(fh, 0);
return 0;
error3:
free_irq(IRQ_S3C2440_CAM_C, pdev);
error2:
free_image_buffer();
error1:
kfree(fh);
return ret;
}
/* switch camif from codec path to preview path. */
static void __inline__ camif_c2p(s3c2440camif_dev * pdev)
{
/* 1. stop codec. */
{
u32 cicoscctrl;
cicoscctrl = ioread32(S3C244X_CICOSCCTRL);
cicoscctrl &= ~(1<<15); // stop preview scaler.
iowrite32(cicoscctrl, S3C244X_CICOSCCTRL);
}
/* 2. soft-reset camif. */
soft_reset_camif();
/* 3. clear all overflow. */
{
u32 ciwdofst;
ciwdofst = ioread32(S3C244X_CIWDOFST);
ciwdofst |= (1<<30)|(1<<15)|(1<<14)|(1<<13)|(1<<12);
iowrite32(ciwdofst, S3C244X_CIWDOFST);
ciwdofst &= ~((1<<30)|(1<<15)|(1<<14)|(1<<13)|(1<<12));
iowrite32(ciwdofst, S3C244X_CIWDOFST);
}
}