V4L/DVB (7719): pvrusb2: Implement input selection enforcement
In the pvrusb2 driver, different interfaces (e.g. V4L, DVB) have
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/pvrusb2/pvrusb2-context.c b/drivers/media/video/pvrusb2/pvrusb2-context.c
index a2ce022..b5db6a5 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-context.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-context.c
@@ -245,6 +245,22 @@
}
+static void pvr2_context_reset_input_limits(struct pvr2_context *mp)
+{
+ unsigned int tmsk,mmsk;
+ struct pvr2_channel *cp;
+ struct pvr2_hdw *hdw = mp->hdw;
+ mmsk = pvr2_hdw_get_input_available(hdw);
+ tmsk = mmsk;
+ for (cp = mp->mc_first; cp; cp = cp->mc_next) {
+ if (!cp->input_mask) continue;
+ tmsk &= cp->input_mask;
+ }
+ pvr2_hdw_set_input_allowed(hdw,mmsk,tmsk);
+ pvr2_hdw_commit_ctl(hdw);
+}
+
+
static void pvr2_context_enter(struct pvr2_context *mp)
{
mutex_lock(&mp->mutex);
@@ -300,7 +316,9 @@
{
struct pvr2_context *mp = cp->mc_head;
pvr2_context_enter(mp);
+ cp->input_mask = 0;
pvr2_channel_disclaim_stream(cp);
+ pvr2_context_reset_input_limits(mp);
if (cp->mc_next) {
cp->mc_next->mc_prev = cp->mc_prev;
} else {
@@ -316,6 +334,57 @@
}
+int pvr2_channel_limit_inputs(struct pvr2_channel *cp,unsigned int cmsk)
+{
+ unsigned int tmsk,mmsk;
+ int ret = 0;
+ struct pvr2_channel *p2;
+ struct pvr2_hdw *hdw = cp->hdw;
+
+ mmsk = pvr2_hdw_get_input_available(hdw);
+ cmsk &= mmsk;
+ if (cmsk == cp->input_mask) {
+ /* No change; nothing to do */
+ return 0;
+ }
+
+ pvr2_context_enter(cp->mc_head);
+ do {
+ if (!cmsk) {
+ cp->input_mask = 0;
+ pvr2_context_reset_input_limits(cp->mc_head);
+ break;
+ }
+ tmsk = mmsk;
+ for (p2 = cp->mc_head->mc_first; p2; p2 = p2->mc_next) {
+ if (p2 == cp) continue;
+ if (!p2->input_mask) continue;
+ tmsk &= p2->input_mask;
+ }
+ if (!(tmsk & cmsk)) {
+ ret = -EPERM;
+ break;
+ }
+ tmsk &= cmsk;
+ if ((ret = pvr2_hdw_set_input_allowed(hdw,mmsk,tmsk)) != 0) {
+ /* Internal failure changing allowed list; probably
+ should not happen, but react if it does. */
+ break;
+ }
+ cp->input_mask = cmsk;
+ pvr2_hdw_commit_ctl(hdw);
+ } while (0);
+ pvr2_context_exit(cp->mc_head);
+ return ret;
+}
+
+
+unsigned int pvr2_channel_get_limited_inputs(struct pvr2_channel *cp)
+{
+ return cp->input_mask;
+}
+
+
int pvr2_channel_claim_stream(struct pvr2_channel *cp,
struct pvr2_context_stream *sp)
{