Some decoders and a lirc_dev interface may need some other operations to work.
For example: IR device register/unregister and ir_keydown events may need to
be tracked.
As some operations can occur in interrupt time, and a lock is needed to prevent
un-registering a decode while decoding a key, the lock needed to be convert
into a spin lock.
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
diff --git a/drivers/media/IR/ir-nec-decoder.c b/drivers/media/IR/ir-nec-decoder.c
index c9a986d..cb57cc2 100644
--- a/drivers/media/IR/ir-nec-decoder.c
+++ b/drivers/media/IR/ir-nec-decoder.c
@@ -178,8 +178,7 @@ err:
* @input_dev: the struct input_dev descriptor of the device
* @evs: event array with type/duration of pulse/space
* @len: length of the array
- * This function returns the number of decoded pulses or -EINVAL if no
- * pulse got decoded
+ * This function returns the number of decoded pulses
*/
static int ir_nec_decode(struct input_dev *input_dev,
struct ir_raw_event *evs,
@@ -192,9 +191,6 @@ static int ir_nec_decode(struct input_dev *input_dev,
if (__ir_nec_decode(input_dev, evs, len, &pos) > 0)
rc++;
}
-
- if (!rc)
- return -EINVAL;
return rc;
}
diff --git a/drivers/media/IR/ir-raw-event.c b/drivers/media/IR/ir-raw-event.c
index 3eae128..11f23f4 100644
--- a/drivers/media/IR/ir-raw-event.c
+++ b/drivers/media/IR/ir-raw-event.c
@@ -14,13 +14,41 @@
#include <media/ir-core.h>
#include <linux/workqueue.h>
+#include <linux/spinlock.h>
/* Define the max number of bit transitions per IR keycode */
#define MAX_IR_EVENT_SIZE 256
/* Used to handle IR raw handler extensions */
static LIST_HEAD(ir_raw_handler_list);
-static DEFINE_MUTEX(ir_raw_handler_lock);
+static spinlock_t ir_raw_handler_lock;
+
+/**
+ * RUN_DECODER() - runs an operation on all IR decoders
+ * @ops: IR raw handler operation to be called
+ * @arg: arguments to be passed to the callback
+ *
+ * Calls ir_raw_handler::ops for all registered IR handlers. It prevents
+ * new decode addition/removal while running, by locking ir_raw_handler_lock
+ * mutex. If an error occurs, it stops the ops. Otherwise, it returns a sum
+ * of the return codes.
+ */
+#define RUN_DECODER(ops, ...) ({ \
+ struct ir_raw_handler *_ir_raw_handler; \
+ int _sumrc = 0, _rc; \
+ spin_lock(&ir_raw_handler_lock); \
+ list_for_each_entry(_ir_raw_handler, &ir_raw_handler_list, list) { \
+ if (_ir_raw_handler->ops) { \
+ _rc = _ir_raw_handler->ops(__VA_ARGS__); \
+ if (_rc < 0) \
+ break; \
+ _sumrc += _rc; \
+ } \
+ } \
+ spin_unlock(&ir_raw_handler_lock); \
+ _sumrc; \
+})
+
/* Used to load the decoders */
static struct work_struct wq_load;
@@ -38,6 +66,8 @@ int ir_raw_event_register(struct input_dev *input_dev)
int rc, size;
ir->raw = kzalloc(sizeof(*ir->raw), GFP_KERNEL);
+ if (!ir->raw)
+ return -ENOMEM;
size = sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE * 2;
size = roundup_pow_of_two(size);
@@ -48,6 +78,19 @@ int ir_raw_event_register(struct input_dev *input_dev)
set_bit(EV_REP, input_dev->evbit);
rc = kfifo_alloc(&ir->raw->kfifo, size, GFP_KERNEL);
+ if (rc < 0) {
+ kfree(ir->raw);
+ ir->raw = NULL;
+ return rc;
+ }
+
+ rc = RUN_DECODER(raw_register, input_dev);
+ if (rc < 0) {
+ kfifo_free(&ir->raw->kfifo);
+ kfree(ir->raw);
+ ir->raw = NULL;
+ return rc;
+ }
return rc;
}
@@ -62,6 +105,8 @@ void ir_raw_event_unregister(struct input_dev *input_dev)
del_timer_sync(&ir->raw->timer_keyup);
+ RUN_DECODER(raw_unregister, input_dev);
+
kfifo_free(&ir->raw->kfifo);
kfree(ir->raw);
ir->raw = NULL;
@@ -109,7 +154,6 @@ int ir_raw_event_handle(struct input_dev *input_dev)
int rc;
struct ir_raw_event *evs;
int len, i;
- struct ir_raw_handler *ir_raw_handler;
/*
* Store the events into a temporary buffer. This allows calling more than
@@ -133,13 +177,10 @@ int ir_raw_event_handle(struct input_dev *input_dev)
/*
* Call all ir decoders. This allows decoding the same event with
- * more than one protocol handler.
- * FIXME: better handle the returned code: does it make sense to use
- * other decoders, if the first one already handled the IR?
+ * more than one protocol handler. It returns the number of keystrokes
+ * sent to the event interface
*/
- list_for_each_entry(ir_raw_handler, &ir_raw_handler_list, list) {
- rc = ir_raw_handler->decode(input_dev, evs, len);
- }
+ rc = RUN_DECODER(decode, input_dev, evs, len);
kfree(evs);
@@ -153,18 +194,18 @@ EXPORT_SYMBOL_GPL(ir_raw_event_handle);
int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler)
{
- mutex_lock(&ir_raw_handler_lock);
+ spin_lock(&ir_raw_handler_lock);
list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list);
- mutex_unlock(&ir_raw_handler_lock);
+ spin_unlock(&ir_raw_handler_lock);
return 0;
}
EXPORT_SYMBOL(ir_raw_handler_register);
void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler)
{
- mutex_lock(&ir_raw_handler_lock);
+ spin_lock(&ir_raw_handler_lock);
list_del(&ir_raw_handler->list);
- mutex_unlock(&ir_raw_handler_lock);
+ spin_unlock(&ir_raw_handler_lock);
}
EXPORT_SYMBOL(ir_raw_handler_unregister);
@@ -181,6 +222,10 @@ static void init_decoders(struct work_struct *work)
void ir_raw_init(void)
{
+ spin_lock_init(&ir_raw_handler_lock);
+
+#ifdef MODULE
INIT_WORK(&wq_load, init_decoders);
schedule_work(&wq_load);
-}
\ No newline at end of file
+#endif
+}
diff --git a/drivers/media/video/saa7134/saa7134-input.c b/drivers/media/video/saa7134/saa7134-input.c
index 38f60e4..8dd74ae 100644
--- a/drivers/media/video/saa7134/saa7134-input.c
+++ b/drivers/media/video/saa7134/saa7134-input.c
@@ -960,7 +960,7 @@ static int saa7134_raw_decode_irq(struct saa7134_dev *dev)
saa_clearb(SAA7134_GPIO_GPMODE3, SAA7134_GPIO_GPRESCAN);
saa_setb(SAA7134_GPIO_GPMODE3, SAA7134_GPIO_GPRESCAN);
pulse = saa_readl(SAA7134_GPIO_GPSTATUS0 >> 2) & ir->mask_keydown;
- ir_raw_event_store(dev->remote->dev, pulse? IR_PULSE : IR_SPACE);
+ ir_raw_event_store(dev->remote->dev, pulse ? IR_PULSE : IR_SPACE);
/*
diff --git a/include/media/ir-core.h b/include/media/ir-core.h
index c377bf4..c704fa7 100644
--- a/include/media/ir-core.h
+++ b/include/media/ir-core.h
@@ -88,6 +88,8 @@ struct ir_raw_handler {
int (*decode)(struct input_dev *input_dev,
struct ir_raw_event *evs,
int len);
+ int (*raw_register)(struct input_dev *input_dev);
+ int (*raw_unregister)(struct input_dev *input_dev);
};
#define to_ir_input_dev(_attr) container_of(_attr, struct ir_input_dev, attr)
@@ -116,12 +118,7 @@ int ir_raw_event_store(struct input_dev *input_dev, enum raw_event_type type);
int ir_raw_event_handle(struct input_dev *input_dev);
int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler);
void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler);
-
-#ifdef MODULE
void ir_raw_init(void);
-#else
-#define ir_raw_init() 0
-#endif
/* from ir-nec-decoder.c */
#ifdef CONFIG_IR_NEC_DECODER_MODULE
--
1.6.6.1
--
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