V4L/DVB: cx88: Only start IR if the input device is opened

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 60 insertions, 9 deletions

diff --git a/drivers/media/video/cx88/cx88-input.c b/drivers/media/video/cx88/cx88-input.c
index 8b52546c6e1d..8bd95be89e67 100644
--- a/drivers/media/video/cx88/cx88-input.c
+++ b/drivers/media/video/cx88/cx88-input.c
@@ -40,6 +40,10 @@ struct cx88_IR {
         struct cx88_core *core;
         struct input_dev *input;
         struct ir_input_state ir;
+        struct ir_dev_props props;
+
+        int users;
+
         char name[32];
         char phys[32];
 
@@ -161,8 +165,16 @@ static enum hrtimer_restart cx88_ir_work(struct hrtimer *timer)
         return HRTIMER_RESTART;
 }
 
-void cx88_ir_start(struct cx88_core *core, struct cx88_IR *ir)
+static int __cx88_ir_start(void *priv)
 {
+        struct cx88_core *core = priv;
+        struct cx88_IR *ir;
+
+        if (!core || !core->ir)
+                return -EINVAL;
+
+        ir = core->ir;
+
         if (ir->polling) {
                 hrtimer_init(&ir->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
                 ir->timer.function = cx88_ir_work;
@@ -175,10 +187,18 @@ void cx88_ir_start(struct cx88_core *core, struct cx88_IR *ir)
                 cx_write(MO_DDS_IO, 0xa80a80);  /* 4 kHz sample rate */
                 cx_write(MO_DDSCFG_IO, 0x5);    /* enable */
         }
+        return 0;
 }
 
-void cx88_ir_stop(struct cx88_core *core, struct cx88_IR *ir)
+static void __cx88_ir_stop(void *priv)
 {
+        struct cx88_core *core = priv;
+        struct cx88_IR *ir;
+
+        if (!core || !core->ir)
+                return;
+
+        ir = core->ir;
         if (ir->sampling) {
                 cx_write(MO_DDSCFG_IO, 0x0);
                 core->pci_irqmask &= ~PCI_INT_IR_SMPINT;
@@ -188,6 +208,37 @@ void cx88_ir_stop(struct cx88_core *core, struct cx88_IR *ir)
                 hrtimer_cancel(&ir->timer);
 }
 
+int cx88_ir_start(struct cx88_core *core)
+{
+        if (core->ir->users)
+                return __cx88_ir_start(core);
+
+        return 0;
+}
+
+void cx88_ir_stop(struct cx88_core *core)
+{
+        if (core->ir->users)
+                __cx88_ir_stop(core);
+}
+
+static int cx88_ir_open(void *priv)
+{
+        struct cx88_core *core = priv;
+
+        core->ir->users++;
+        return __cx88_ir_start(core);
+}
+
+static void cx88_ir_close(void *priv)
+{
+        struct cx88_core *core = priv;
+
+        core->ir->users--;
+        if (!core->ir->users)
+                __cx88_ir_stop(core);
+}
+
 /* ---------------------------------------------------------------------- */
 
 int cx88_ir_init(struct cx88_core *core, struct pci_dev *pci)
@@ -383,19 +434,19 @@ int cx88_ir_init(struct cx88_core *core, struct pci_dev *pci)
         ir->core = core;
         core->ir = ir;
 
-        cx88_ir_start(core, ir);
+        ir->props.priv = core;
+        ir->props.open = cx88_ir_open;
+        ir->props.close = cx88_ir_close;
 
         /* all done */
-        err = ir_input_register(ir->input, ir_codes, NULL, MODULE_NAME);
+        err = ir_input_register(ir->input, ir_codes, &ir->props, MODULE_NAME);
         if (err)
-                goto err_out_stop;
+                goto err_out_free;
 
         return 0;
 
- err_out_stop:
-        cx88_ir_stop(core, ir);
-        core->ir = NULL;
  err_out_free:
+        core->ir = NULL;
         kfree(ir);
         return err;
 }
@@ -408,7 +459,7 @@ int cx88_ir_fini(struct cx88_core *core)
         if (NULL == ir)
                 return 0;
 
-        cx88_ir_stop(core, ir);
+        cx88_ir_stop(core);
         ir_input_unregister(ir->input);
         kfree(ir);