[PATCH 3/5] media: au0828-video changes to use media tuner token api

Shuah Khan
2014-09-22T15:07:18Z

au0828-video driver uses vb1 api and needs changes to vb1
v4l2 interfaces that change the tuner status. In addition
to that this driver initializes the tuner from a some ioctls
that are query (read) tuner status. These ioctls are changed
to hold the tuner token to avoid disrupting digital stream
if active. Further more, release v4l2_file_operations powers
down the tuner. The following changes are made:

read, poll v4l2_file_operations:
- hold tuner in shared analog mode
- return leaving tuner in shared mode

vb1 streamon:
- hold tuner in shared analog mode
- return leaving tuner in shared mode

release v4l2_file_operations:
- hold tuner in exclusive analog mode to power down.
Don't call s_power when tuner is busy.

Initialize dev_parent field struct video_device to enable
media tuner token lookup from v4l2-core.

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
---
drivers/media/usb/au0828/au0828-video.c | 43 ++++++++++++++++++++++++++++++-
1 file changed, 42 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/au0828/au0828-video.c b/drivers/media/usb/au0828/au0828-video.c
index 5f337b1..52a3644 100644
--- a/drivers/media/usb/au0828/au0828-video.c
+++ b/drivers/media/usb/au0828/au0828-video.c
@@ -34,6 +34,7 @@
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/device.h>
+#include <linux/media_tknres.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-event.h>
@@ -1085,10 +1086,21 @@ static int au0828_v4l2_close(struct file *filp)

au0828_uninit_isoc(dev);

+ ret = media_get_tuner_tkn(&dev->usbdev->dev, MEDIA_MODE_ANALOG);
+ if (ret) {
+ dev_info(&dev->usbdev->dev,
+ "%s: Tuner is busy\n", __func__);
+ /* don't touch tuner and usb device interface */
+ goto skip_s_power;
+ }
+ dev_info(&dev->usbdev->dev, "%s: Putting tuner to sleep\n",
+ __func__);
/* Save some power by putting tuner to sleep */
v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_power, 0);
- dev->std_set_in_tuner_core = 0;
+ media_put_tuner_tkn(&dev->usbdev->dev, MEDIA_MODE_ANALOG);

+skip_s_power:
+ dev->std_set_in_tuner_core = 0;
/* When close the device, set the usb intf0 into alt0 to free
USB bandwidth */
ret = usb_set_interface(dev->usbdev, 0, 0);
@@ -1136,6 +1148,12 @@ static ssize_t au0828_v4l2_read(struct file *filp, char __user *buf,
if (rc < 0)
return rc;

+ /* don't put the tuner token - this case is same as STREAMON */
+ rc = media_get_shared_tuner_tkn(&dev->usbdev->dev, MEDIA_MODE_ANALOG);
+ if (rc) {
+ dev_info(&dev->usbdev->dev, "%s: Tuner is busy\n", __func__);
+ return -EBUSY;
+ }
if (mutex_lock_interruptible(&dev->lock))
return -ERESTARTSYS;
au0828_init_tuner(dev);
@@ -1177,6 +1195,12 @@ static unsigned int au0828_v4l2_poll(struct file *filp, poll_table *wait)
if (check_dev(dev) < 0)
return POLLERR;

+ /* don't put the tuner token - this case is same as STREAMON */
+ res = media_get_shared_tuner_tkn(&dev->usbdev->dev, MEDIA_MODE_ANALOG);
+ if (res) {
+ dev_info(&dev->usbdev->dev, "%s: Tuner is busy\n", __func__);
+ return -EBUSY;
+ }
res = v4l2_ctrl_poll(filp, wait);
if (!(req_events & (POLLIN | POLLRDNORM)))
return res;
@@ -1548,16 +1572,24 @@ static int vidioc_g_tuner(struct file *file, void *priv, struct v4l2_tuner *t)
{
struct au0828_fh *fh = priv;
struct au0828_dev *dev = fh->dev;
+ int ret;

if (t->index != 0)
return -EINVAL;

+ ret = media_get_shared_tuner_tkn(&dev->usbdev->dev, MEDIA_MODE_ANALOG);
+ if (ret) {
+ dev_info(&dev->usbdev->dev, "%s: Tuner is busy\n", __func__);
+ return -EBUSY;
+ }
+
strcpy(t->name, "Auvitek tuner");

au0828_init_tuner(dev);
i2c_gate_ctrl(dev, 1);
v4l2_device_call_all(&dev->v4l2_dev, 0, tuner, g_tuner, t);
i2c_gate_ctrl(dev, 0);
+ media_put_tuner_tkn(&dev->usbdev->dev, MEDIA_MODE_ANALOG);
return 0;
}

@@ -1682,6 +1714,12 @@ static int vidioc_streamon(struct file *file, void *priv,
dprintk(1, "vidioc_streamon fh=%p t=%d fh->res=%d dev->res=%d\n",
fh, type, fh->resources, dev->resources);

+ rc = media_get_shared_tuner_tkn(&dev->usbdev->dev, MEDIA_MODE_ANALOG);
+ if (rc) {
+ dev_info(&dev->usbdev->dev, "%s: Tuner is busy\n", __func__);
+ return -EBUSY;
+ }
+
if (unlikely(!res_get(fh, get_ressource(fh))))
return -EBUSY;

@@ -2083,12 +2121,15 @@ int au0828_analog_register(struct au0828_dev *dev,
dev->vdev->v4l2_dev = &dev->v4l2_dev;
dev->vdev->lock = &dev->lock;
strcpy(dev->vdev->name, "au0828a video");
+ /* there is no way to deduce parent from v4l2_dev */
+ dev->vdev->dev_parent = &dev->usbdev->dev;

/* Setup the VBI device */
*dev->vbi_dev = au0828_video_template;
dev->vbi_dev->v4l2_dev = &dev->v4l2_dev;
dev->vbi_dev->lock = &dev->lock;
strcpy(dev->vbi_dev->name, "au0828a vbi");
+ dev->vbi_dev->dev_parent = &dev->usbdev->dev;

/* Register the v4l2 device */
video_set_drvdata(dev->vdev, dev);
--
1.7.10.4