V4L/DVB (8898): pvrusb2: Be able to programmatically retrieve a control's default value

The pvrusb2 control mechanism up until now has used a constant int to
hold a control's default value.  This change makes it possible to
retrieve the control's default through some other means, e.g. as a
result of a query from lower level software.

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

4 files changed, 15 insertions, 6 deletions

diff --git a/drivers/media/video/pvrusb2/pvrusb2-ctrl.c b/drivers/media/video/pvrusb2/pvrusb2-ctrl.c
index 0764fbfffb73..2741c7b0b537 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-ctrl.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-ctrl.c
@@ -134,13 +134,19 @@ int pvr2_ctrl_get_min(struct pvr2_ctrl *cptr)
 
 
 /* Retrieve control's default value (any type) */
-int pvr2_ctrl_get_def(struct pvr2_ctrl *cptr)
+int pvr2_ctrl_get_def(struct pvr2_ctrl *cptr, int *valptr)
 {
         int ret = 0;
         if (!cptr) return 0;
         LOCK_TAKE(cptr->hdw->big_lock); do {
                 if (cptr->info->type == pvr2_ctl_int) {
-                        ret = cptr->info->default_value;
+                        if (cptr->info->get_def_value) {
+                                /* Comment to keep checkpatch.pl quiet */
+                                ret = cptr->info->get_def_value(cptr, valptr);
+                        } else {
+                                /* Comment to keep checkpatch.pl quiet */
+                                *valptr = cptr->info->default_value;
+                        }
                 }
         } while(0); LOCK_GIVE(cptr->hdw->big_lock);
         return ret;
diff --git a/drivers/media/video/pvrusb2/pvrusb2-ctrl.h b/drivers/media/video/pvrusb2/pvrusb2-ctrl.h
index 0371ae6e6e4e..794ff90121c7 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-ctrl.h
+++ b/drivers/media/video/pvrusb2/pvrusb2-ctrl.h
@@ -49,7 +49,7 @@ int pvr2_ctrl_get_max(struct pvr2_ctrl *);
 int pvr2_ctrl_get_min(struct pvr2_ctrl *);
 
 /* Retrieve control's default value (any type) */
-int pvr2_ctrl_get_def(struct pvr2_ctrl *);
+int pvr2_ctrl_get_def(struct pvr2_ctrl *, int *valptr);
 
 /* Retrieve control's enumeration count (enum only) */
 int pvr2_ctrl_get_cnt(struct pvr2_ctrl *);
diff --git a/drivers/media/video/pvrusb2/pvrusb2-hdw-internal.h b/drivers/media/video/pvrusb2/pvrusb2-hdw-internal.h
index 0453244b7fa2..8bc9669733df 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-hdw-internal.h
+++ b/drivers/media/video/pvrusb2/pvrusb2-hdw-internal.h
@@ -82,6 +82,7 @@ struct pvr2_ctl_info {
 
         /* Control's implementation */
         pvr2_ctlf_get_value get_value;      /* Get its value */
+        pvr2_ctlf_get_value get_def_value;  /* Get its default value */
         pvr2_ctlf_get_value get_min_value;  /* Get minimum allowed value */
         pvr2_ctlf_get_value get_max_value;  /* Get maximum allowed value */
         pvr2_ctlf_set_value set_value;      /* Set its value */
diff --git a/drivers/media/video/pvrusb2/pvrusb2-v4l2.c b/drivers/media/video/pvrusb2/pvrusb2-v4l2.c
index 00306faeac01..c53037a25570 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-v4l2.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-v4l2.c
@@ -533,7 +533,7 @@ static int pvr2_v4l2_do_ioctl(struct inode *inode, struct file *file,
 
                         lmin = pvr2_ctrl_get_min(hcp);
                         lmax = pvr2_ctrl_get_max(hcp);
-                        ldef = pvr2_ctrl_get_def(hcp);
+                        pvr2_ctrl_get_def(hcp, &ldef);
                         if (w == -1) {
                                 w = ldef;
                         } else if (w < lmin) {
@@ -543,7 +543,7 @@ static int pvr2_v4l2_do_ioctl(struct inode *inode, struct file *file,
                         }
                         lmin = pvr2_ctrl_get_min(vcp);
                         lmax = pvr2_ctrl_get_max(vcp);
-                        ldef = pvr2_ctrl_get_def(vcp);
+                        pvr2_ctrl_get_def(vcp, &ldef);
                         if (h == -1) {
                                 h = ldef;
                         } else if (h < lmin) {
@@ -604,6 +604,7 @@ static int pvr2_v4l2_do_ioctl(struct inode *inode, struct file *file,
         case VIDIOC_QUERYCTRL:
         {
                 struct pvr2_ctrl *cptr;
+                int val;
                 struct v4l2_queryctrl *vc = (struct v4l2_queryctrl *)arg;
                 ret = 0;
                 if (vc->id & V4L2_CTRL_FLAG_NEXT_CTRL) {
@@ -627,7 +628,8 @@ static int pvr2_v4l2_do_ioctl(struct inode *inode, struct file *file,
                            pvr2_ctrl_get_desc(cptr));
                 strlcpy(vc->name,pvr2_ctrl_get_desc(cptr),sizeof(vc->name));
                 vc->flags = pvr2_ctrl_get_v4lflags(cptr);
-                vc->default_value = pvr2_ctrl_get_def(cptr);
+                pvr2_ctrl_get_def(cptr, &val);
+                vc->default_value = val;
                 switch (pvr2_ctrl_get_type(cptr)) {
                 case pvr2_ctl_enum:
                         vc->type = V4L2_CTRL_TYPE_MENU;