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authorMichael Krufky <mkrufky@kernellabs.com>2009-05-23 18:00:59 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-12-05 18:40:21 -0200
commit9133aee09e3689c116c526fa9011c33b872e65c1 (patch)
tree39d57cadaf657855da42f44d77567f0a3ba3bc82 /drivers/media/dvb/dvb-core
parentdbda8f701abb0e4693a30e9bef4a2301d1c8ea80 (diff)
V4L/DVB (13103): create a standard method for dvb adapter drivers to override frontend ioctls
Signed-off-by: Michael Krufky <mkrufky@kernellabs.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/dvb/dvb-core')
-rw-r--r--drivers/media/dvb/dvb-core/dvb_frontend.c20
-rw-r--r--drivers/media/dvb/dvb-core/dvbdev.h28
2 files changed, 47 insertions, 1 deletions
diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c
index 98082416aa5..e9ec8e91105 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -1712,7 +1712,18 @@ static int dvb_frontend_ioctl_legacy(struct inode *inode, struct file *file,
struct dvb_device *dvbdev = file->private_data;
struct dvb_frontend *fe = dvbdev->priv;
struct dvb_frontend_private *fepriv = fe->frontend_priv;
- int err = -EOPNOTSUPP;
+ int cb_err, err = -EOPNOTSUPP;
+
+ if (fe->dvb->fe_ioctl_override) {
+ cb_err = fe->dvb->fe_ioctl_override(fe, cmd, parg,
+ DVB_FE_IOCTL_PRE);
+ if (cb_err < 0)
+ return cb_err;
+ if (cb_err > 0)
+ return 0;
+ /* fe_ioctl_override returning 0 allows
+ * dvb-core to continue handling the ioctl */
+ }
switch (cmd) {
case FE_GET_INFO: {
@@ -1978,6 +1989,13 @@ static int dvb_frontend_ioctl_legacy(struct inode *inode, struct file *file,
break;
};
+ if (fe->dvb->fe_ioctl_override) {
+ cb_err = fe->dvb->fe_ioctl_override(fe, cmd, parg,
+ DVB_FE_IOCTL_POST);
+ if (cb_err < 0)
+ return cb_err;
+ }
+
return err;
}
diff --git a/drivers/media/dvb/dvb-core/dvbdev.h b/drivers/media/dvb/dvb-core/dvbdev.h
index 01fc7048474..f7b499d4a3c 100644
--- a/drivers/media/dvb/dvb-core/dvbdev.h
+++ b/drivers/media/dvb/dvb-core/dvbdev.h
@@ -54,6 +54,8 @@
module_param_array(adapter_nr, short, NULL, 0444); \
MODULE_PARM_DESC(adapter_nr, "DVB adapter numbers")
+struct dvb_frontend;
+
struct dvb_adapter {
int num;
struct list_head list_head;
@@ -69,6 +71,32 @@ struct dvb_adapter {
int mfe_shared; /* indicates mutually exclusive frontends */
struct dvb_device *mfe_dvbdev; /* frontend device in use */
struct mutex mfe_lock; /* access lock for thread creation */
+
+ /* Allow the adapter/bridge driver to perform an action before and/or
+ * after the core handles an ioctl:
+ *
+ * DVB_FE_IOCTL_PRE indicates that the ioctl has not yet been handled.
+ * DVB_FE_IOCTL_POST indicates that the ioctl has been handled.
+ *
+ * When DVB_FE_IOCTL_PRE is passed to the callback as the stage arg:
+ *
+ * return 0 to allow dvb-core to handle the ioctl.
+ * return a positive int to prevent dvb-core from handling the ioctl,
+ * and exit without error.
+ * return a negative int to prevent dvb-core from handling the ioctl,
+ * and return that value as an error.
+ *
+ * When DVB_FE_IOCTL_POST is passed to the callback as the stage arg:
+ *
+ * return 0 to allow the dvb_frontend ioctl handler to exit normally.
+ * return a negative int to cause the dvb_frontend ioctl handler to
+ * return that value as an error.
+ */
+#define DVB_FE_IOCTL_PRE 0
+#define DVB_FE_IOCTL_POST 1
+ int (*fe_ioctl_override)(struct dvb_frontend *fe,
+ unsigned int cmd, void *parg,
+ unsigned int stage);
};