V4L/DVB (4376): Make it possible for run-time calculation of control min/max in pvrusb2

The internal control implementation in the pvrusb2 driver normally
encodes integer range limits using literal values in a const
structure.  This change adds two function pointers, which if not null
will be called through in order to determine integer min / max
values.

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

1 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 fb6198f1df98..c77de859cc8e 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-ctrl.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-ctrl.c
@@ -43,12 +43,17 @@ int pvr2_ctrl_set_mask_value(struct pvr2_ctrl *cptr,int mask,int val)
                         if (cptr->info->type == pvr2_ctl_bitmask) {
                                 mask &= cptr->info->def.type_bitmask.valid_bits;
                         } else if (cptr->info->type == pvr2_ctl_int) {
-                                if (val < cptr->info->def.type_int.min_value) {
-                                        break;
+                                int lim;
+                                lim = cptr->info->def.type_int.min_value;
+                                if (cptr->info->get_min_value) {
+                                        cptr->info->get_min_value(cptr,&lim);
                                 }
-                                if (val > cptr->info->def.type_int.max_value) {
-                                        break;
+                                if (val < lim) break;
+                                lim = cptr->info->def.type_int.max_value;
+                                if (cptr->info->get_max_value) {
+                                        cptr->info->get_max_value(cptr,&lim);
                                 }
+                                if (val > lim) break;
                         } else if (cptr->info->type == pvr2_ctl_enum) {
                                 if (val >= cptr->info->def.type_enum.count) {
                                         break;
@@ -91,7 +96,9 @@ int pvr2_ctrl_get_max(struct pvr2_ctrl *cptr)
         int ret = 0;
         if (!cptr) return 0;
         LOCK_TAKE(cptr->hdw->big_lock); do {
-                if (cptr->info->type == pvr2_ctl_int) {
+                if (cptr->info->get_max_value) {
+                        cptr->info->get_max_value(cptr,&ret);
+                } else if (cptr->info->type == pvr2_ctl_int) {
                         ret = cptr->info->def.type_int.max_value;
                 }
         } while(0); LOCK_GIVE(cptr->hdw->big_lock);
@@ -105,7 +112,9 @@ int pvr2_ctrl_get_min(struct pvr2_ctrl *cptr)
         int ret = 0;
         if (!cptr) return 0;
         LOCK_TAKE(cptr->hdw->big_lock); do {
-                if (cptr->info->type == pvr2_ctl_int) {
+                if (cptr->info->get_min_value) {
+                        cptr->info->get_min_value(cptr,&ret);
+                } else if (cptr->info->type == pvr2_ctl_int) {
                         ret = cptr->info->def.type_int.min_value;
                 }
         } while(0); LOCK_GIVE(cptr->hdw->big_lock);