Adds a method to pass IR raw pulse/code events into ir-core. This is
needed in order to support LIRC. It also helps to move common code
from the drivers into the core.
In order to allow testing, it implements a simple NEC protocol decoder
at ir-nec-decoder.c file. The logic is about the same used at saa7134
driver that handles Avermedia M135A and Encore FM53 boards.
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
create mode 100644 drivers/media/IR/ir-nec-decoder.c
create mode 100644 drivers/media/IR/ir-raw-event.c
diff --git a/drivers/media/IR/Makefile b/drivers/media/IR/Makefile
index 171890e..18794c7 100644
--- a/drivers/media/IR/Makefile
+++ b/drivers/media/IR/Makefile
@@ -1,5 +1,5 @@
ir-common-objs := ir-functions.o ir-keymaps.o
-ir-core-objs := ir-keytable.o ir-sysfs.o
+ir-core-objs := ir-keytable.o ir-sysfs.o ir-raw-event.o ir-nec-decoder.o
obj-$(CONFIG_IR_CORE) += ir-core.o
obj-$(CONFIG_VIDEO_IR) += ir-common.o
diff --git a/drivers/media/IR/ir-nec-decoder.c b/drivers/media/IR/ir-nec-decoder.c
new file mode 100644
index 0000000..16360eb
--- /dev/null
+++ b/drivers/media/IR/ir-nec-decoder.c
@@ -0,0 +1,131 @@
+/* ir-raw-event.c - handle IR Pulse/Space event
+ *
+ * Copyright (C) 2010 by Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <media/ir-core.h>
+
+/* Start time: 4.5 ms */
+#define MIN_START_TIME 3900000
+#define MAX_START_TIME 5100000
+
+/* Pulse time: 560 us */
+#define MIN_PULSE_TIME 460000
+#define MAX_PULSE_TIME 660000
+
+/* Bit 1 space time: 2.25ms-560 us */
+#define MIN_BIT1_TIME 1490000
+#define MAX_BIT1_TIME 1890000
+
+/* Bit 0 space time: 1.12ms-560 us */
+#define MIN_BIT0_TIME 360000
+#define MAX_BIT0_TIME 760000
+
+
+/** 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
+*/
+
+int ir_nec_decode(struct input_dev *input_dev,
+ struct ir_raw_event *evs,
+ int len)
+{
+ int i, count = -1;
+ int ircode = 0, not_code = 0;
+#if 0
+ /* Needed only after porting the event code to the decoder */
+ struct ir_input_dev *ir = input_get_drvdata(input_dev);
+#endif
+
+ /* Be sure that the first event is an start one and is a pulse */
+ for (i = 0; i < len; i++) {
+ if (evs[i].type & (IR_START_EVENT | IR_PULSE))
+ break;
+ }
+ i++; /* First event doesn't contain data */
+
+ if (i >= len)
+ return 0;
+
+ /* First space should have 4.5 ms otherwise is not NEC protocol */
+ if ((evs[i].delta.tv_nsec < MIN_START_TIME) |
+ (evs[i].delta.tv_nsec > MAX_START_TIME) |
+ (evs[i].type != IR_SPACE))
+ goto err;
+
+ /*
+ * FIXME: need to implement the repeat sequence
+ */
+
+ count = 0;
+ for (i++; i < len; i++) {
+ int bit;
+
+ if ((evs[i].delta.tv_nsec < MIN_PULSE_TIME) |
+ (evs[i].delta.tv_nsec > MAX_PULSE_TIME) |
+ (evs[i].type != IR_PULSE))
+ goto err;
+
+ if (++i >= len)
+ goto err;
+ if (evs[i].type != IR_SPACE)
+ goto err;
+
+ if ((evs[i].delta.tv_nsec > MIN_BIT1_TIME) &&
+ (evs[i].delta.tv_nsec < MAX_BIT1_TIME))
+ bit = 1;
+ else if ((evs[i].delta.tv_nsec > MIN_BIT0_TIME) &&
+ (evs[i].delta.tv_nsec < MAX_BIT0_TIME))
+ bit = 0;
+ else
+ goto err;
+
+ if (bit) {
+ int shift = count;
+ /* 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;
+ }
+ }
+ if (++count == 32)
+ break;
+ }
+
+ /*
+ * Fixme: may need to accept Extended NEC protocol?
+ */
+ if ((ircode & ~not_code) != ircode) {
+ IR_dprintk(1, "NEC checksum error: code 0x%04x, not-code 0x%04x\n",
+ ircode, not_code);
+ return -EINVAL;
+ }
+
+ IR_dprintk(1, "NEC scancode 0x%04x\n", ircode);
+
+ return ircode;
+err:
+ IR_dprintk(1, "NEC decoded failed at bit %d while decoding %luus time\n",
+ count, (evs[i].delta.tv_nsec + 500) / 1000);
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(ir_nec_decode);
diff --git a/drivers/media/IR/ir-raw-event.c b/drivers/media/IR/ir-raw-event.c
new file mode 100644
index 0000000..9c71ac8
--- /dev/null
+++ b/drivers/media/IR/ir-raw-event.c
@@ -0,0 +1,117 @@
+/* ir-raw-event.c - handle IR Pulse/Space event
+ *
+ * Copyright (C) 2010 by Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <media/ir-core.h>
+
+/* Define the max number of bit transitions per IR keycode */
+#define MAX_IR_EVENT_SIZE 256
+
+int ir_raw_event_register(struct input_dev *input_dev)
+{
+ struct ir_input_dev *ir = input_get_drvdata(input_dev);
+ int rc, size;
+
+ ir->raw = kzalloc(sizeof(*ir->raw), GFP_KERNEL);
+
+ size = sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE * 2;
+ size = roundup_pow_of_two(size);
+
+ rc = kfifo_alloc(&ir->raw->kfifo, size, GFP_KERNEL);
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_register);
+
+void ir_raw_event_unregister(struct input_dev *input_dev)
+{
+ struct ir_input_dev *ir = input_get_drvdata(input_dev);
+
+ if (!ir->raw)
+ return;
+
+ kfifo_free(&ir->raw->kfifo);
+ kfree(ir->raw);
+ ir->raw = NULL;
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_unregister);
+
+int ir_raw_event_store(struct input_dev *input_dev, enum raw_event_type type)
+{
+ struct ir_input_dev *ir = input_get_drvdata(input_dev);
+ struct timespec ts;
+ struct ir_raw_event event;
+ int rc;
+
+ if (!ir->raw)
+ return -EINVAL;
+
+ event.type = type;
+ event.delta.tv_sec = 0;
+ event.delta.tv_nsec = 0;
+
+ ktime_get_ts(&ts);
+
+ if (timespec_equal(&ir->raw->last_event, &event.delta))
+ event.type |= IR_START_EVENT;
+ else
+ event.delta = timespec_sub(ts, ir->raw->last_event);
+
+ memcpy(&ir->raw->last_event, &ts, sizeof(ts));
+
+ if (event.delta.tv_sec) {
+ event.type |= IR_START_EVENT;
+ event.delta.tv_sec = 0;
+ event.delta.tv_nsec = 0;
+ }
+
+ kfifo_in(&ir->raw->kfifo, &event, sizeof(event));
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_store);
+
+int ir_raw_event_handle(struct input_dev *input_dev)
+{
+ struct ir_input_dev *ir = input_get_drvdata(input_dev);
+ int rc;
+ struct ir_raw_event *evs;
+ int len, i;
+
+ /*
+ * Store the events into a temporary buffer. This allows calling more than
+ * one decoder to deal with the received data
+ */
+ len = kfifo_len(&ir->raw->kfifo) / sizeof(*evs);
+ if (!len)
+ return 0;
+ evs = kmalloc(len * sizeof(*evs), GFP_ATOMIC);
+
+ for (i = 0; i < len; i++) {
+ rc = kfifo_out(&ir->raw->kfifo, &evs[i], sizeof(*evs));
+ if (rc != sizeof(*evs)) {
+ IR_dprintk(1, "overflow error: received %d instead of %zd\n",
+ rc, sizeof(*evs));
+ return -EINVAL;
+ }
+ IR_dprintk(2, "event type %d, time before event: %07luus\n",
+ evs[i].type, (evs[i].delta.tv_nsec + 500) / 1000);
+ }
+
+ rc = ir_nec_decode(input_dev, evs, len);
+
+ kfree(evs);
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_handle);
diff --git a/drivers/media/video/saa7134/saa7134-input.c b/drivers/media/video/saa7134/saa7134-input.c
index 8187928..7382995 100644
--- a/drivers/media/video/saa7134/saa7134-input.c
+++ b/drivers/media/video/saa7134/saa7134-input.c
@@ -67,6 +67,7 @@ MODULE_PARM_DESC(disable_other_ir, "disable full codes of "
/* 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);
static void saa7134_nec_timer(unsigned long data);
@@ -402,10 +403,12 @@ void saa7134_input_irq(struct saa7134_dev *dev)
if (ir->nec_gpio) {
saa7134_nec_irq(dev);
- } else if (!ir->polling && !ir->rc5_gpio) {
+ } 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);
}
}
@@ -418,6 +421,23 @@ static void saa7134_input_timer(unsigned long data)
mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling));
}
+void ir_raw_decode_timer_end(unsigned long data)
+{
+ struct saa7134_dev *dev = (struct saa7134_dev *)data;
+ struct card_ir *ir = dev->remote;
+ int rc;
+
+ /*
+ * FIXME: the IR key handling code should be called by the decoder,
+ * after implementing the repeat mode
+ */
+ rc = ir_raw_event_handle(dev->remote->dev);
+ if (rc >= 0) {
+ ir_input_keydown(ir->dev, &ir->ir, rc);
+ ir_input_nokey(ir->dev, &ir->ir);
+ }
+}
+
void saa7134_ir_start(struct saa7134_dev *dev, struct card_ir *ir)
{
if (ir->running)
@@ -446,6 +466,11 @@ void saa7134_ir_start(struct saa7134_dev *dev, struct card_ir *ir)
setup_timer(&ir->timer_keyup, saa7134_nec_timer,
(unsigned long)dev);
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);
+ ir->timer_end.function = ir_raw_decode_timer_end;
+ ir->timer_end.data = (unsigned long)dev;
}
}
@@ -461,6 +486,9 @@ void saa7134_ir_stop(struct saa7134_dev *dev)
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->running = 0;
}
@@ -508,6 +536,7 @@ int saa7134_input_init1(struct saa7134_dev *dev)
int polling = 0;
int rc5_gpio = 0;
int nec_gpio = 0;
+ int raw_decode = 0;
u64 ir_type = IR_TYPE_OTHER;
int err;
@@ -573,7 +602,7 @@ int saa7134_input_init1(struct saa7134_dev *dev)
ir_codes = &ir_codes_avermedia_m135a_rm_jx_table;
mask_keydown = 0x0040000;
mask_keycode = 0xffff;
- nec_gpio = 1;
+ raw_decode = 1;
break;
case SAA7134_BOARD_AVERMEDIA_777:
case SAA7134_BOARD_AVERMEDIA_A16AR:
@@ -754,6 +783,7 @@ int saa7134_input_init1(struct saa7134_dev *dev)
ir->polling = polling;
ir->rc5_gpio = rc5_gpio;
ir->nec_gpio = nec_gpio;
+ ir->raw_decode = raw_decode;
/* init input device */
snprintf(ir->name, sizeof(ir->name), "saa7134 IR (%s)",
@@ -761,7 +791,7 @@ int saa7134_input_init1(struct saa7134_dev *dev)
snprintf(ir->phys, sizeof(ir->phys), "pci-%s/ir0",
pci_name(dev->pci));
- if (ir_codes->ir_type != IR_TYPE_OTHER) {
+ if (ir_codes->ir_type != IR_TYPE_OTHER && !raw_decode) {
ir->props.allowed_protos = IR_TYPE_RC5 | IR_TYPE_NEC;
ir->props.priv = dev;
ir->props.change_protocol = saa7134_ir_change_protocol;
@@ -789,6 +819,11 @@ int saa7134_input_init1(struct saa7134_dev *dev)
err = ir_input_register(ir->dev, ir_codes, &ir->props, MODULE_NAME);
if (err)
goto err_out_stop;
+ if (ir_codes->ir_type != IR_TYPE_OTHER) {
+ err = ir_raw_event_register(ir->dev);
+ if (err)
+ goto err_out_stop;
+ }
saa7134_ir_start(dev, ir);
@@ -812,6 +847,7 @@ void saa7134_input_fini(struct saa7134_dev *dev)
return;
saa7134_ir_stop(dev);
+ ir_raw_event_unregister(dev->remote->dev);
ir_input_unregister(dev->remote->dev);
kfree(dev->remote);
dev->remote = NULL;
@@ -918,6 +954,48 @@ void saa7134_probe_i2c_ir(struct saa7134_dev *dev)
i2c_new_device(&dev->i2c_adap, &info);
}
+static int saa7134_raw_decode_irq(struct saa7134_dev *dev)
+{
+ struct card_ir *ir = dev->remote;
+ unsigned long timeout;
+ int count, pulse, oldpulse;
+
+ /* Disable IR IRQ line */
+ saa_clearl(SAA7134_IRQ2, SAA7134_IRQ2_INTE_GPIO18);
+
+ /* Generate initial event */
+ 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);
+
+#if 1
+ /* Wait up to 10 ms for event change */
+ oldpulse = pulse;
+ for (count = 0; count < 1000; 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;
+ }
+
+ /* Store final event */
+ ir_raw_event_store(dev->remote->dev, pulse? IR_PULSE : IR_SPACE);
+#endif
+ /* Wait 15 ms before deciding to do something else */
+ timeout = jiffies + jiffies_to_msecs(15);
+ mod_timer(&ir->timer_end, timeout);
+
+ /* Enable IR IRQ line */
+ saa_setl(SAA7134_IRQ2, SAA7134_IRQ2_INTE_GPIO18);
+
+ return 1;
+}
+
static int saa7134_rc5_irq(struct saa7134_dev *dev)
{
struct card_ir *ir = dev->remote;
@@ -960,7 +1038,6 @@ static int saa7134_rc5_irq(struct saa7134_dev *dev)
return 1;
}
-
/* On NEC protocol, One has 2.25 ms, and zero has 1.125 ms
The first pulse (start) has 9 + 4.5 ms
*/
diff --git a/include/media/ir-common.h b/include/media/ir-common.h
index 41469b7..87f2ec7 100644
--- a/include/media/ir-common.h
+++ b/include/media/ir-common.h
@@ -82,6 +82,9 @@ struct card_ir {
/* NEC decoding */
u32 nec_gpio;
struct tasklet_struct tlet;
+
+ /* IR core raw decoding */
+ u32 raw_decode;
};
/* Routines from ir-functions.c */
diff --git a/include/media/ir-core.h b/include/media/ir-core.h
index 1eae72d..369969d 100644
--- a/include/media/ir-core.h
+++ b/include/media/ir-core.h
@@ -16,6 +16,8 @@
#include <linux/input.h>
#include <linux/spinlock.h>
+#include <linux/kfifo.h>
+#include <linux/time.h>
extern int ir_core_debug;
#define IR_dprintk(level, fmt, arg...) if (ir_core_debug >= level) \
@@ -27,6 +29,13 @@ extern int ir_core_debug;
#define IR_TYPE_NEC (1 << 2)
#define IR_TYPE_OTHER (((u64)1) << 63l)
+enum raw_event_type {
+ IR_SPACE = (1 << 0),
+ IR_PULSE = (1 << 1),
+ IR_START_EVENT = (1 << 2),
+ IR_STOP_EVENT = (1 << 3),
+};
+
struct ir_scancode {
u16 scancode;
u32 keycode;
@@ -46,6 +55,15 @@ struct ir_dev_props {
int (*change_protocol)(void *priv, u64 ir_type);
};
+struct ir_raw_event {
+ struct timespec delta; /* Time spent before event */
+ enum raw_event_type type; /* event type */
+};
+
+struct ir_raw_event_ctrl {
+ struct kfifo kfifo; /* fifo for the pulse/space events */
+ struct timespec last_event; /* when last event occurred */
+};
struct ir_input_dev {
struct device dev; /* device */
@@ -53,7 +71,9 @@ struct ir_input_dev {
struct ir_scancode_table rc_tab; /* scan/key table */
unsigned long devno; /* device number */
const struct ir_dev_props *props; /* Device properties */
+ struct ir_raw_event_ctrl *raw; /* for raw pulse/space events */
};
+
#define to_ir_input_dev(_attr) container_of(_attr, struct ir_input_dev, attr)
/* Routines from ir-keytable.c */
@@ -72,4 +92,16 @@ void ir_input_unregister(struct input_dev *input_dev);
int ir_register_class(struct input_dev *input_dev);
void ir_unregister_class(struct input_dev *input_dev);
+/* Routines from ir-raw-event.c */
+int ir_raw_event_register(struct input_dev *input_dev);
+void ir_raw_event_unregister(struct input_dev *input_dev);
+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);
+
+/* from ir-nec-decoder.c */
+int ir_nec_decode(struct input_dev *input_dev,
+ struct ir_raw_event *evs,
+ int len);
+
+
#endif
--
1.6.6.1
--
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