-/* ir-rc5-decoder.c - handle RC-5 IR Pulse/Space protocol
+/* ir-rc5-decoder.c - handle RC5(x) IR Pulse/Space protocol
*
* Copyright (C) 2010 by Mauro Carvalho Chehab <mchehab@redhat.com>
*
*/
/*
- * This code only handles 14 bits RC-5 protocols. There are other variants
- * that use a different number of bits. This is currently unsupported
- * It considers a carrier of 36 kHz, with a total of 14 bits, where
+ * This code handles 14 bits RC5 protocols and 20 bits RC5x protocols.
+ * There are other variants that use a different number of bits.
+ * This is currently unsupported.
+ * It considers a carrier of 36 kHz, with a total of 14/20 bits, where
* the first two bits are start bits, and a third one is a filing bit
*/
-#include <media/ir-core.h>
-
-static unsigned int ir_rc5_remote_gap = 888888;
+#include "ir-core-priv.h"
#define RC5_NBITS 14
-#define RC5_BIT (ir_rc5_remote_gap * 2)
-#define RC5_DURATION (ir_rc5_remote_gap * RC5_NBITS)
-
-/* Used to register rc5_decoder clients */
-static LIST_HEAD(decoder_list);
-static spinlock_t decoder_lock;
+#define RC5X_NBITS 20
+#define CHECK_RC5X_NBITS 8
+#define RC5_UNIT 888888 /* ns */
+#define RC5_BIT_START (1 * RC5_UNIT)
+#define RC5_BIT_END (1 * RC5_UNIT)
+#define RC5X_SPACE (4 * RC5_UNIT)
enum rc5_state {
STATE_INACTIVE,
- STATE_MARKSPACE,
- STATE_TRAILER,
-};
-
-struct rc5_code {
- u8 address;
- u8 command;
-};
-
-struct decoder_data {
- struct list_head list;
- struct ir_input_dev *ir_dev;
- int enabled:1;
-
- /* State machine control */
- enum rc5_state state;
- struct rc5_code rc5_code;
- unsigned code, elapsed, last_bit, last_code;
-};
-
-
-/**
- * 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;
-}
-
-static ssize_t store_enabled(struct device *d,
- struct device_attribute *mattr,
- const char *buf,
- size_t len)
-{
- unsigned long value;
- struct ir_input_dev *ir_dev = dev_get_drvdata(d);
- struct decoder_data *data = get_decoder_data(ir_dev);
-
- if (!data)
- return -EINVAL;
-
- if (strict_strtoul(buf, 10, &value) || value > 1)
- return -EINVAL;
-
- data->enabled = value;
-
- return len;
-}
-
-static ssize_t show_enabled(struct device *d,
- struct device_attribute *mattr, char *buf)
-{
- struct ir_input_dev *ir_dev = dev_get_drvdata(d);
- struct decoder_data *data = get_decoder_data(ir_dev);
-
- if (!data)
- return -EINVAL;
-
- if (data->enabled)
- return sprintf(buf, "1\n");
- else
- return sprintf(buf, "0\n");
-}
-
-static DEVICE_ATTR(enabled, S_IRUGO | S_IWUSR, show_enabled, store_enabled);
-
-static struct attribute *decoder_attributes[] = {
- &dev_attr_enabled.attr,
- NULL
-};
-
-static struct attribute_group decoder_attribute_group = {
- .name = "rc5_decoder",
- .attrs = decoder_attributes,
+ STATE_BIT_START,
+ STATE_BIT_END,
+ STATE_CHECK_RC5X,
+ STATE_FINISHED,
};
/**
- * handle_event() - Decode one RC-5 pulse or space
+ * ir_rc5_decode() - Decode one RC-5 pulse or space
* @input_dev: the struct input_dev descriptor of the device
- * @ev: event array with type/duration of pulse/space
+ * @ev: the struct ir_raw_event descriptor of the pulse/space
*
* This function returns -EINVAL if the pulse violates the state machine
*/
-static int ir_rc5_decode(struct input_dev *input_dev,
- struct ir_raw_event *ev)
+static int ir_rc5_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);
- int is_pulse, scancode, delta, toggle;
+ struct rc5_dec *data = &ir_dev->raw->rc5;
+ u8 toggle;
+ u32 scancode;
- data = get_decoder_data(ir_dev);
- if (!data)
- return -EINVAL;
+ if (!(ir_dev->raw->enabled_protocols & IR_TYPE_RC5))
+ return 0;
- if (!data->enabled)
+ if (IS_RESET(ev)) {
+ data->state = STATE_INACTIVE;
return 0;
+ }
- delta = DIV_ROUND_CLOSEST(ev->delta.tv_nsec, ir_rc5_remote_gap);
-
- /* The duration time refers to the last bit time */
- is_pulse = (ev->type & IR_PULSE) ? 1 : 0;
+ if (!geq_margin(ev.duration, RC5_UNIT, RC5_UNIT / 2))
+ goto out;
- /* Very long delays are considered as start events */
- if (delta > RC5_DURATION || (ev->type & IR_START_EVENT))
- data->state = STATE_INACTIVE;
+again:
+ IR_dprintk(2, "RC5(x) decode started at state %i (%uus %s)\n",
+ data->state, TO_US(ev.duration), TO_STR(ev.pulse));
- switch (data->state) {
- case STATE_INACTIVE:
- IR_dprintk(2, "currently inative. Start bit (%s) @%uus\n",
- is_pulse ? "pulse" : "space",
- (unsigned)(ev->delta.tv_nsec + 500) / 1000);
-
- /* Discards the initial start space */
- if (!is_pulse)
- goto err;
- data->code = 1;
- data->last_bit = 1;
- data->elapsed = 0;
- memset(&data->rc5_code, 0, sizeof(data->rc5_code));
- data->state = STATE_MARKSPACE;
+ if (!geq_margin(ev.duration, RC5_UNIT, RC5_UNIT / 2))
return 0;
- case STATE_MARKSPACE:
- if (delta != 1)
- data->last_bit = data->last_bit ? 0 : 1;
- data->elapsed += delta;
+ switch (data->state) {
- if ((data->elapsed % 2) == 1)
- return 0;
+ case STATE_INACTIVE:
+ if (!ev.pulse)
+ break;
- data->code <<= 1;
- data->code |= data->last_bit;
+ data->state = STATE_BIT_START;
+ data->count = 1;
+ /* We just need enough bits to get to STATE_CHECK_RC5X */
+ data->wanted_bits = RC5X_NBITS;
+ decrease_duration(&ev, RC5_BIT_START);
+ goto again;
- /* Fill the 2 unused bits at the command with 0 */
- if (data->elapsed / 2 == 6)
- data->code <<= 2;
+ case STATE_BIT_START:
+ if (!eq_margin(ev.duration, RC5_BIT_START, RC5_UNIT / 2))
+ break;
- if (data->elapsed >= (RC5_NBITS - 1) * 2) {
- scancode = data->code;
+ data->bits <<= 1;
+ if (!ev.pulse)
+ data->bits |= 1;
+ data->count++;
+ data->state = STATE_BIT_END;
+ return 0;
- /* Check for the start bits */
- if ((scancode & 0xc000) != 0xc000) {
- IR_dprintk(1, "Code 0x%04x doesn't have two start bits. It is not RC-5\n", scancode);
- goto err;
- }
+ case STATE_BIT_END:
+ if (!is_transition(&ev, &ir_dev->raw->prev_ev))
+ break;
- toggle = (scancode & 0x2000) ? 1 : 0;
+ if (data->count == data->wanted_bits)
+ data->state = STATE_FINISHED;
+ else if (data->count == CHECK_RC5X_NBITS)
+ data->state = STATE_CHECK_RC5X;
+ else
+ data->state = STATE_BIT_START;
+
+ decrease_duration(&ev, RC5_BIT_END);
+ goto again;
+
+ case STATE_CHECK_RC5X:
+ if (!ev.pulse && geq_margin(ev.duration, RC5X_SPACE, RC5_UNIT / 2)) {
+ /* RC5X */
+ data->wanted_bits = RC5X_NBITS;
+ decrease_duration(&ev, RC5X_SPACE);
+ } else {
+ /* RC5 */
+ data->wanted_bits = RC5_NBITS;
+ }
+ data->state = STATE_BIT_START;
+ goto again;
- if (scancode == data->last_code) {
- IR_dprintk(1, "RC-5 repeat\n");
- ir_repeat(input_dev);
- } else {
- data->last_code = scancode;
- scancode &= 0x1fff;
- IR_dprintk(1, "RC-5 scancode 0x%04x\n", scancode);
+ case STATE_FINISHED:
+ if (ev.pulse)
+ break;
- ir_keydown(input_dev, scancode, 0);
- }
- data->state = STATE_TRAILER;
+ if (data->wanted_bits == RC5X_NBITS) {
+ /* RC5X */
+ u8 xdata, command, system;
+ xdata = (data->bits & 0x0003F) >> 0;
+ command = (data->bits & 0x00FC0) >> 6;
+ system = (data->bits & 0x1F000) >> 12;
+ toggle = (data->bits & 0x20000) ? 1 : 0;
+ command += (data->bits & 0x01000) ? 0 : 0x40;
+ scancode = system << 16 | command << 8 | xdata;
+
+ IR_dprintk(1, "RC5X scancode 0x%06x (toggle: %u)\n",
+ scancode, toggle);
+
+ } else {
+ /* RC5 */
+ u8 command, system;
+ command = (data->bits & 0x0003F) >> 0;
+ system = (data->bits & 0x007C0) >> 6;
+ toggle = (data->bits & 0x00800) ? 1 : 0;
+ command += (data->bits & 0x01000) ? 0 : 0x40;
+ scancode = system << 8 | command;
+
+ IR_dprintk(1, "RC5 scancode 0x%04x (toggle: %u)\n",
+ scancode, toggle);
}
- return 0;
- case STATE_TRAILER:
+
+ ir_keydown(input_dev, scancode, toggle);
data->state = STATE_INACTIVE;
return 0;
}
-err:
- IR_dprintk(1, "RC-5 decoded failed at %s @ %luus\n",
- is_pulse ? "pulse" : "space",
- (ev->delta.tv_nsec + 500) / 1000);
+out:
+ IR_dprintk(1, "RC5(x) decode failed at state %i (%uus %s)\n",
+ data->state, TO_US(ev.duration), TO_STR(ev.pulse));
data->state = STATE_INACTIVE;
return -EINVAL;
}
-static int ir_rc5_register(struct input_dev *input_dev)
-{
- struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
- struct decoder_data *data;
- int rc;
-
- rc = sysfs_create_group(&ir_dev->dev.kobj, &decoder_attribute_group);
- if (rc < 0)
- return rc;
-
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data) {
- sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group);
- return -ENOMEM;
- }
-
- data->ir_dev = ir_dev;
- data->enabled = 1;
-
- spin_lock(&decoder_lock);
- list_add_tail(&data->list, &decoder_list);
- spin_unlock(&decoder_lock);
-
- return 0;
-}
-
-static int ir_rc5_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;
-
- sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group);
-
- spin_lock(&decoder_lock);
- list_del(&data->list);
- spin_unlock(&decoder_lock);
-
- return 0;
-}
-
static struct ir_raw_handler rc5_handler = {
+ .protocols = IR_TYPE_RC5,
.decode = ir_rc5_decode,
- .raw_register = ir_rc5_register,
- .raw_unregister = ir_rc5_unregister,
};
static int __init ir_rc5_decode_init(void)
{
ir_raw_handler_register(&rc5_handler);
- printk(KERN_INFO "IR RC-5 protocol handler initialized\n");
+ printk(KERN_INFO "IR RC5(x) protocol handler initialized\n");
return 0;
}
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
-MODULE_DESCRIPTION("RC-5 IR protocol decoder");
+MODULE_DESCRIPTION("RC5(x) IR protocol decoder");
projects / mv-sheeva.git / blobdiff