V4L/DVB: ir-core: move decoding state to ir_raw_event_ctrl

This patch moves the state from each raw decoder into the
ir_raw_event_ctrl struct.

This allows the removal of code like this:

        spin_lock(&decoder_lock);
        list_for_each_entry(data, &decoder_list, list) {
                if (data->ir_dev == ir_dev)
                        break;
        }
        spin_unlock(&decoder_lock);
        return data;

which is currently run for each decoder on each event in order
to get the client-specific decoding state data.

In addition, ir decoding modules and ir driver module load
order is now independent. Centralizing the data also allows
for a nice code reduction of about 30% per raw decoder as
client lists and client registration callbacks are no longer
necessary (but still kept around for the benefit of the lirc
decoder).

Out-of-tree modules can still use a similar trick to what
the raw decoders did before this patch until they are merged.

Signed-off-by: David Härdeman <david@hardeman.nu>
Acked-by: Jarod Wilson <jarod@redhat.com>
Tested-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 10 insertions, 84 deletions

diff --git a/drivers/media/IR/ir-sony-decoder.c b/drivers/media/IR/ir-sony-decoder.c
index e15db3334998..b9074f07c7a0 100644
--- a/drivers/media/IR/ir-sony-decoder.c
+++ b/drivers/media/IR/ir-sony-decoder.c
@@ -23,10 +23,6 @@
 #define SONY_BIT_SPACE		(1 * SONY_UNIT)
 #define SONY_TRAILER_SPACE	(10 * SONY_UNIT) /* minimum */
 
-/* Used to register sony_decoder clients */
-static LIST_HEAD(decoder_list);
-static DEFINE_SPINLOCK(decoder_lock);
-
 enum sony_state {
 	STATE_INACTIVE,
 	STATE_HEADER_SPACE,
@@ -35,36 +31,6 @@ enum sony_state {
 	STATE_FINISHED,
 };
 
-struct decoder_data {
-	struct list_head	list;
-	struct ir_input_dev	*ir_dev;
-
-	/* State machine control */
-	enum sony_state		state;
-	u32			sony_bits;
-	unsigned		count;
-};
-
-
-/**
- * get_decoder_data()	- gets decoder data
- * @input_dev:	input device
- *
- * Returns the struct decoder_data that corresponds to a device
- */
-static struct decoder_data *get_decoder_data(struct  ir_input_dev *ir_dev)
-{
-	struct decoder_data *data = NULL;
-
-	spin_lock(&decoder_lock);
-	list_for_each_entry(data, &decoder_list, list) {
-		if (data->ir_dev == ir_dev)
-			break;
-	}
-	spin_unlock(&decoder_lock);
-	return data;
-}
-
 /**
  * ir_sony_decode() - Decode one Sony pulse or space
  * @input_dev:	the struct input_dev descriptor of the device
@@ -74,15 +40,11 @@ static struct decoder_data *get_decoder_data(struct  ir_input_dev *ir_dev)
  */
 static int ir_sony_decode(struct input_dev *input_dev, struct ir_raw_event ev)
 {
-	struct decoder_data *data;
 	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
+	struct sony_dec *data = &ir_dev->raw->sony;
 	u32 scancode;
 	u8 device, subdevice, function;
 
-	data = get_decoder_data(ir_dev);
-	if (!data)
-		return -EINVAL;
-
 	if (!(ir_dev->raw->enabled_protocols & IR_TYPE_SONY))
 		return 0;
 
@@ -124,9 +86,9 @@ static int ir_sony_decode(struct input_dev *input_dev, struct ir_raw_event ev)
 		if (!ev.pulse)
 			break;
 
-		data->sony_bits <<= 1;
+		data->bits <<= 1;
 		if (eq_margin(ev.duration, SONY_BIT_1_PULSE, SONY_UNIT / 2))
-			data->sony_bits |= 1;
+			data->bits |= 1;
 		else if (!eq_margin(ev.duration, SONY_BIT_0_PULSE, SONY_UNIT / 2))
 			break;
 
@@ -160,19 +122,19 @@ static int ir_sony_decode(struct input_dev *input_dev, struct ir_raw_event ev)
 
 		switch (data->count) {
 		case 12:
-			device    = bitrev8((data->sony_bits <<  3) & 0xF8);
+			device    = bitrev8((data->bits <<  3) & 0xF8);
 			subdevice = 0;
-			function  = bitrev8((data->sony_bits >>  4) & 0xFE);
+			function  = bitrev8((data->bits >>  4) & 0xFE);
 			break;
 		case 15:
-			device    = bitrev8((data->sony_bits >>  0) & 0xFF);
+			device    = bitrev8((data->bits >>  0) & 0xFF);
 			subdevice = 0;
-			function  = bitrev8((data->sony_bits >>  7) & 0xFD);
+			function  = bitrev8((data->bits >>  7) & 0xFD);
 			break;
 		case 20:
-			device    = bitrev8((data->sony_bits >>  5) & 0xF8);
-			subdevice = bitrev8((data->sony_bits >>  0) & 0xFF);
-			function  = bitrev8((data->sony_bits >> 12) & 0xFE);
+			device    = bitrev8((data->bits >>  5) & 0xF8);
+			subdevice = bitrev8((data->bits >>  0) & 0xFF);
+			function  = bitrev8((data->bits >> 12) & 0xFE);
 			break;
 		default:
 			IR_dprintk(1, "Sony invalid bitcount %u\n", data->count);
@@ -193,45 +155,9 @@ out:
 	return -EINVAL;
 }
 
-static int ir_sony_register(struct input_dev *input_dev)
-{
-	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
-	struct decoder_data *data;
-
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
-	if (!data)
-		return -ENOMEM;
-
-	data->ir_dev = ir_dev;
-
-	spin_lock(&decoder_lock);
-	list_add_tail(&data->list, &decoder_list);
-	spin_unlock(&decoder_lock);
-
-	return 0;
-}
-
-static int ir_sony_unregister(struct input_dev *input_dev)
-{
-	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
-	static struct decoder_data *data;
-
-	data = get_decoder_data(ir_dev);
-	if (!data)
-		return 0;
-
-	spin_lock(&decoder_lock);
-	list_del(&data->list);
-	spin_unlock(&decoder_lock);
-
-	return 0;
-}
-
 static struct ir_raw_handler sony_handler = {
 	.protocols	= IR_TYPE_SONY,
 	.decode		= ir_sony_decode,
-	.raw_register	= ir_sony_register,
-	.raw_unregister	= ir_sony_unregister,
 };
 
 static int __init ir_sony_decode_init(void)