[media] rc: Remove ir-common module

Now, just one old bttv board uses the old RC5 raw decoding routines.
Its conversion to rc-core requires the generation of IRQ data for both
positive and negative transitions at the IRQ line. I'm not sure if
bttv driver supports it or if the transitions will be reliable enough.
So, due to the lack of hardware for testing, the better for now is to
just move the legacy routines to bttv driver, and wait for someone with
a Nebula Digi could help to port it to use also rc-core raw decoders.

Acked-by: Hermann Pitton <hermann-pitton@arcor.de>
Acked-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 221 insertions, 7 deletions

diff --git a/drivers/media/video/saa7134/saa7134-input.c b/drivers/media/video/saa7134/saa7134-input.c
index 72562b8..fbb2ff1 100644
--- a/drivers/media/video/saa7134/saa7134-input.c
+++ b/drivers/media/video/saa7134/saa7134-input.c
@@ -54,8 +54,11 @@ MODULE_PARM_DESC(disable_other_ir, "disable full codes of "
 #define i2cdprintk(fmt, arg...)    if (ir_debug) \
 	printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg)
 
-/* Helper function for raw decoding at GPIO16 or GPIO18 */
+/* Helper functions for RC5 and NEC decoding at GPIO16 or GPIO18 */
+static int saa7134_rc5_irq(struct saa7134_dev *dev);
+static int saa7134_nec_irq(struct saa7134_dev *dev);
 static int saa7134_raw_decode_irq(struct saa7134_dev *dev);
+static void nec_task(unsigned long data);
 
 /* -------------------- GPIO generic keycode builder -------------------- */
 
@@ -394,8 +397,12 @@ void saa7134_input_irq(struct saa7134_dev *dev)
 	if (!ir->running)
 		return;
 
-	if (!ir->polling && !ir->raw_decode) {
+	if (ir->nec_gpio) {
+		saa7134_nec_irq(dev);
+	} else if (!ir->polling && !ir->rc5_gpio && !ir->raw_decode) {
 		build_key(dev);
+	} else if (ir->rc5_gpio) {
+		saa7134_rc5_irq(dev);
 	} else if (ir->raw_decode) {
 		saa7134_raw_decode_irq(dev);
 	}
@@ -441,6 +448,17 @@ static int __saa7134_ir_start(void *priv)
 			    (unsigned long)dev);
 		ir->timer.expires  = jiffies + HZ;
 		add_timer(&ir->timer);
+	} else if (ir->rc5_gpio) {
+		/* set timer_end for code completion */
+		init_timer(&ir->timer_end);
+		ir->timer_end.function = ir_rc5_timer_end;
+		ir->timer_end.data = (unsigned long)ir;
+		ir->shift_by = 2;
+		ir->start = 0x2;
+		ir->addr = 0x17;
+		ir->rc5_remote_gap = ir_rc5_remote_gap;
+	} else if (ir->nec_gpio) {
+		tasklet_init(&ir->tlet, nec_task, (unsigned long)dev);
 	} else if (ir->raw_decode) {
 		/* set timer_end for code completion */
 		init_timer(&ir->timer_end);
@@ -468,6 +486,10 @@ static void __saa7134_ir_stop(void *priv)
 		return;
 	if (dev->remote->polling)
 		del_timer_sync(&dev->remote->timer);
+	else if (ir->rc5_gpio)
+		del_timer_sync(&ir->timer_end);
+	else if (ir->nec_gpio)
+		tasklet_kill(&ir->tlet);
 	else if (ir->raw_decode) {
 		del_timer_sync(&ir->timer_end);
 		ir->active = 0;
@@ -509,6 +531,40 @@ static void saa7134_ir_close(struct rc_dev *rc)
 		__saa7134_ir_stop(dev);
 }
 
+
+static int saa7134_ir_change_protocol(struct rc_dev *rc, u64 ir_type)
+{
+	struct saa7134_dev *dev = rc->priv;
+	struct card_ir *ir = dev->remote;
+	u32 nec_gpio, rc5_gpio;
+
+	if (ir_type == IR_TYPE_RC5) {
+		dprintk("Changing protocol to RC5\n");
+		nec_gpio = 0;
+		rc5_gpio = 1;
+	} else if (ir_type == IR_TYPE_NEC) {
+		dprintk("Changing protocol to NEC\n");
+		nec_gpio = 1;
+		rc5_gpio = 0;
+	} else {
+		dprintk("IR protocol type %ud is not supported\n",
+			(unsigned)ir_type);
+		return -EINVAL;
+	}
+
+	if (ir->running) {
+		saa7134_ir_stop(dev);
+		ir->nec_gpio = nec_gpio;
+		ir->rc5_gpio = rc5_gpio;
+		saa7134_ir_start(dev);
+	} else {
+		ir->nec_gpio = nec_gpio;
+		ir->rc5_gpio = rc5_gpio;
+	}
+
+	return 0;
+}
+
 int saa7134_input_init1(struct saa7134_dev *dev)
 {
 	struct card_ir *ir;
@@ -518,7 +574,10 @@ int saa7134_input_init1(struct saa7134_dev *dev)
 	u32 mask_keydown = 0;
 	u32 mask_keyup   = 0;
 	int polling      = 0;
+	int rc5_gpio	 = 0;
+	int nec_gpio	 = 0;
 	int raw_decode   = 0;
+	int allow_protocol_change = 0;
 	int err;
 
 	if (dev->has_remote != SAA7134_REMOTE_GPIO)
@@ -708,10 +767,9 @@ int saa7134_input_init1(struct saa7134_dev *dev)
 		break;
 	case SAA7134_BOARD_ENCORE_ENLTV_FM53:
 		ir_codes     = RC_MAP_ENCORE_ENLTV_FM53;
-		mask_keydown = 0x0040000;	/* Enable GPIO18 line on both edges */
-		mask_keyup   = 0x0040000;
-		mask_keycode = 0xffff;
-		raw_decode   = 1;
+		mask_keydown = 0x0040000;
+		mask_keycode = 0x00007f;
+		nec_gpio = 1;
 		break;
 	case SAA7134_BOARD_10MOONSTVMASTER3:
 		ir_codes     = RC_MAP_ENCORE_ENLTV;
@@ -771,6 +829,8 @@ int saa7134_input_init1(struct saa7134_dev *dev)
 	ir->mask_keydown = mask_keydown;
 	ir->mask_keyup   = mask_keyup;
 	ir->polling      = polling;
+	ir->rc5_gpio	 = rc5_gpio;
+	ir->nec_gpio	 = nec_gpio;
 	ir->raw_decode	 = raw_decode;
 
 	/* init input device */
@@ -785,6 +845,11 @@ int saa7134_input_init1(struct saa7134_dev *dev)
 	if (raw_decode)
 		rc->driver_type = RC_DRIVER_IR_RAW;
 
+	if (!raw_decode && allow_protocol_change) {
+		rc->allowed_protos = IR_TYPE_RC5 | IR_TYPE_NEC;
+		rc->change_protocol = saa7134_ir_change_protocol;
+	}
+
 	rc->input_name = ir->name;
 	rc->input_phys = ir->phys;
 	rc->input_id.bustype = BUS_PCI;
@@ -958,3 +1023,152 @@ static int saa7134_raw_decode_irq(struct saa7134_dev *dev)
 
 	return 1;
 }
+
+static int saa7134_rc5_irq(struct saa7134_dev *dev)
+{
+	struct card_ir *ir = dev->remote;
+	struct timeval tv;
+	u32 gap;
+	unsigned long current_jiffies, timeout;
+
+	/* get time of bit */
+	current_jiffies = jiffies;
+	do_gettimeofday(&tv);
+
+	/* avoid overflow with gap >1s */
+	if (tv.tv_sec - ir->base_time.tv_sec > 1) {
+		gap = 200000;
+	} else {
+		gap = 1000000 * (tv.tv_sec - ir->base_time.tv_sec) +
+		    tv.tv_usec - ir->base_time.tv_usec;
+	}
+
+	/* active code => add bit */
+	if (ir->active) {
+		/* only if in the code (otherwise spurious IRQ or timer
+		   late) */
+		if (ir->last_bit < 28) {
+			ir->last_bit = (gap - ir_rc5_remote_gap / 2) /
+			    ir_rc5_remote_gap;
+			ir->code |= 1 << ir->last_bit;
+		}
+		/* starting new code */
+	} else {
+		ir->active = 1;
+		ir->code = 0;
+		ir->base_time = tv;
+		ir->last_bit = 0;
+
+		timeout = current_jiffies + (500 + 30 * HZ) / 1000;
+		mod_timer(&ir->timer_end, timeout);
+	}
+
+	return 1;
+}
+
+static void nec_task(unsigned long data)
+{
+	struct saa7134_dev *dev = (struct saa7134_dev *) data;
+	struct card_ir *ir;
+	struct timeval tv;
+	int count, pulse, oldpulse, gap;
+	u32 ircode = 0, not_code = 0;
+	int ngap = 0;
+
+	if (!data) {
+		printk(KERN_ERR "saa713x/ir: Can't recover dev struct\n");
+		/* GPIO will be kept disabled */
+		return;
+	}
+
+	ir = dev->remote;
+
+	/* rising SAA7134_GPIO_GPRESCAN reads the status */
+	saa_clearb(SAA7134_GPIO_GPMODE3, SAA7134_GPIO_GPRESCAN);
+	saa_setb(SAA7134_GPIO_GPMODE3, SAA7134_GPIO_GPRESCAN);
+
+	oldpulse = saa_readl(SAA7134_GPIO_GPSTATUS0 >> 2) & ir->mask_keydown;
+	pulse = oldpulse;
+
+	do_gettimeofday(&tv);
+	ir->base_time = tv;
+
+	/* Decode NEC pulsecode. This code can take up to 76.5 ms to run.
+	   Unfortunately, using IRQ to decode pulse didn't work, since it uses
+	   a pulse train of 38KHz. This means one pulse on each 52 us
+	 */
+	do {
+		/* Wait until the end of pulse/space or 5 ms */
+		for (count = 0; count < 500; count++)  {
+			udelay(10);
+			/* rising SAA7134_GPIO_GPRESCAN reads the status */
+			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;
+			if (pulse != oldpulse)
+				break;
+		}
+
+		do_gettimeofday(&tv);
+		gap = 1000000 * (tv.tv_sec - ir->base_time.tv_sec) +
+				tv.tv_usec - ir->base_time.tv_usec;
+
+		if (!pulse) {
+			/* Bit 0 has 560 us, while bit 1 has 1120 us.
+			   Do something only if bit == 1
+			 */
+			if (ngap && (gap > 560 + 280)) {
+				unsigned int shift = ngap - 1;
+
+				/* Address first, then command */
+				if (shift < 8) {
+					shift += 8;
+					ircode |= 1 << shift;
+				} else if (shift < 16) {
+					not_code |= 1 << shift;
+				} else if (shift < 24) {
+					shift -= 16;
+					ircode |= 1 << shift;
+				} else {
+					shift -= 24;
+					not_code |= 1 << shift;
+				}
+			}
+			ngap++;
+		}
+
+
+		ir->base_time = tv;
+
+		/* TIMEOUT - Long pulse */
+		if (gap >= 5000)
+			break;
+		oldpulse = pulse;
+	} while (ngap < 32);
+
+	if (ngap == 32) {
+		/* FIXME: should check if not_code == ~ircode */
+		ir->code = ir_extract_bits(ircode, ir->mask_keycode);
+
+		dprintk("scancode = 0x%02x (code = 0x%02x, notcode= 0x%02x)\n",
+			 ir->code, ircode, not_code);
+
+		ir_keydown(ir->dev, ir->code, 0);
+	} else {
+		dprintk("Repeat last key\n");
+		ir_repeat(ir->dev);
+	}
+
+	saa_setl(SAA7134_IRQ2, SAA7134_IRQ2_INTE_GPIO18_P);
+}
+
+static int saa7134_nec_irq(struct saa7134_dev *dev)
+{
+	struct card_ir *ir = dev->remote;
+
+	saa_clearl(SAA7134_IRQ2, SAA7134_IRQ2_INTE_GPIO18_P);
+	tasklet_schedule(&ir->tlet);
+
+	return 1;
+}
diff --git a/drivers/media/video/saa7134/saa7134.h b/drivers/media/video/saa7134/saa7134.h
index a6c726f..4e37b8b 100644
--- a/drivers/media/video/saa7134/saa7134.h
+++ b/drivers/media/video/saa7134/saa7134.h
@@ -37,7 +37,7 @@
 #include <media/v4l2-ioctl.h>
 #include <media/v4l2-device.h>
 #include <media/tuner.h>
-#include <media/ir-core.h>
+#include <media/ir-common.h>
 #include <media/ir-kbd-i2c.h>
 #include <media/videobuf-dma-sg.h>
 #include <sound/core.h>