David Härdeman wrote:
Your're fast!
OK, the code looks good. I'll test and apply it, if it passes on the test.
The only missed thing is the comment about the kfifo size (see the email
I just sent). If you prefer, I can add a one line comment when applying it,
to avoid you to re-send the code.
> drivers/media/IR/ir-raw-event.c is currently written with the assumption
> that all "raw" hardware will generate events only on state change (i.e.
> when a pulse or space starts).
>
> However, some hardware (like mceusb, probably the most popular IR receiver
> out there) only generates duration data (and that data is buffered so using
> any kind of timing on the data is futile).
>
> Furthermore, using signed int's to represent pulse/space durations in ms
> is a well-known approach to anyone with experience in writing ir decoders.
>
> This patch (which has been tested this time) is still a RFC on my proposed
> interface changes.
>
> Changes since last version:
>
> o s64's are used to represent pulse/space durations in ns.
>
> o Lots of #defines are used in the decoders
>
> o Refreshed to apply cleanly on top of Mauro's current git tree
>
> o Jon's comments wrt. interrupt-context safe functions have been added
>
> Index: ir/drivers/media/IR/ir-raw-event.c
> ===================================================================
> --- ir.orig/drivers/media/IR/ir-raw-event.c 2010-04-08 12:30:28.036098192
> +0200
> +++ ir/drivers/media/IR/ir-raw-event.c 2010-04-08 12:45:19.780145403
> +0200
> @@ -15,9 +15,10 @@
> #include <media/ir-core.h>
> #include <linux/workqueue.h>
> #include <linux/spinlock.h>
> +#include <linux/sched.h>
>
> -/* Define the max number of bit transitions per IR keycode */
> -#define MAX_IR_EVENT_SIZE 256
> +/* Define the max number of pulse/space transitions to buffer */
> +#define MAX_IR_EVENT_SIZE 512
>
> /* Used to handle IR raw handler extensions */
> static LIST_HEAD(ir_raw_handler_list);
> @@ -53,19 +54,30 @@
> /* Used to load the decoders */
> static struct work_struct wq_load;
>
> +static void ir_raw_event_work(struct work_struct *work)
> +{
> + s64 d;
> + struct ir_raw_event_ctrl *raw =
> + container_of(work, struct ir_raw_event_ctrl, rx_work);
> +
> + while (kfifo_out(&raw->kfifo, &d, sizeof(d)) == sizeof(d))
> + RUN_DECODER(decode, raw->input_dev, d);
> +}
> +
> int ir_raw_event_register(struct input_dev *input_dev)
> {
> struct ir_input_dev *ir = input_get_drvdata(input_dev);
> - int rc, size;
> + int rc;
>
> 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);
> + ir->raw->input_dev = input_dev;
> + INIT_WORK(&ir->raw->rx_work, ir_raw_event_work);
>
> - rc = kfifo_alloc(&ir->raw->kfifo, size, GFP_KERNEL);
> + rc = kfifo_alloc(&ir->raw->kfifo, sizeof(s64) * MAX_IR_EVENT_SIZE,
> + GFP_KERNEL);
> if (rc < 0) {
> kfree(ir->raw);
> ir->raw = NULL;
> @@ -90,6 +102,7 @@
> if (!ir->raw)
> return;
>
> + cancel_work_sync(&ir->raw->rx_work);
> RUN_DECODER(raw_unregister, input_dev);
>
> kfifo_free(&ir->raw->kfifo);
> @@ -97,74 +110,90 @@
> ir->raw = NULL;
> }
>
> -int ir_raw_event_store(struct input_dev *input_dev, enum raw_event_type type)
> +/**
> + * ir_raw_event_store() - pass a pulse/space duration to the raw ir decoders
> + * @input_dev: the struct input_dev device descriptor
> + * @duration: duration of the pulse or space in ns
> + *
> + * This routine (which may be called from an interrupt context) stores a
> + * pulse/space duration for the raw ir decoding state machines. Pulses are
> + * signalled as positive values and spaces as negative values. A zero value
> + * will reset the decoding state machines.
> + */
> +int ir_raw_event_store(struct input_dev *input_dev, s64 duration)
> {
> - struct ir_input_dev *ir = input_get_drvdata(input_dev);
> - struct timespec ts;
> - struct ir_raw_event event;
> - int rc;
> + struct ir_input_dev *ir = input_get_drvdata(input_dev);
>
> if (!ir->raw)
> return -EINVAL;
>
> - event.type = type;
> - event.delta.tv_sec = 0;
> - event.delta.tv_nsec = 0;
> + if (kfifo_in(&ir->raw->kfifo, &duration, sizeof(duration)) !=
> sizeof(duration))
> + return -ENOMEM;
>
> - ktime_get_ts(&ts);
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(ir_raw_event_store);
>
> - if (timespec_equal(&ir->raw->last_event, &event.delta))
> - event.type |= IR_START_EVENT;
> - else
> - event.delta = timespec_sub(ts, ir->raw->last_event);
> +/**
> + * ir_raw_event_store_edge() - notify raw ir decoders of the start of a
> pulse/space
> + * @input_dev: the struct input_dev device descriptor
> + * @type: the type of the event that has occurred
> + *
> + * This routine (which may be called from an interrupt context) is used to
> + * store the beginning of an ir pulse or space (or the start/end of ir
> + * reception) for the raw ir decoding state machines. This is used by
> + * hardware which does not provide durations directly but only interrupts
> + * (or similar events) on state change.
> + */
> +int ir_raw_event_store_edge(struct input_dev *input_dev, enum raw_event_type
> type)
> +{
> + struct ir_input_dev *ir = input_get_drvdata(input_dev);
> + ktime_t now;
> + s64 delta; /* ns */
> + int rc = 0;
> +
> + if (!ir->raw)
> + return -EINVAL;
>
> - memcpy(&ir->raw->last_event, &ts, sizeof(ts));
> + now = ktime_get();
> + delta = ktime_to_ns(ktime_sub(now, ir->raw->last_event));
>
> - if (event.delta.tv_sec) {
> - event.type |= IR_START_EVENT;
> - event.delta.tv_sec = 0;
> - event.delta.tv_nsec = 0;
> - }
> + /* Check for a long duration since last event or if we're
> + * being called for the first time, note that delta can't
> + * possibly be negative.
> + */
> + if (delta > NSEC_PER_SEC || !ir->raw->last_type)
> + type |= IR_START_EVENT;
>
> - kfifo_in(&ir->raw->kfifo, &event, sizeof(event));
> + if (type & IR_START_EVENT)
> + ir_raw_event_reset(input_dev);
> + else if (ir->raw->last_type & IR_SPACE)
> + rc = ir_raw_event_store(input_dev, -delta);
> + else if (ir->raw->last_type & IR_PULSE)
> + rc = ir_raw_event_store(input_dev, delta);
> + else
> + return 0;
>
> + ir->raw->last_event = now;
> + ir->raw->last_type = type;
> return rc;
> }
> -EXPORT_SYMBOL_GPL(ir_raw_event_store);
> +EXPORT_SYMBOL_GPL(ir_raw_event_store_edge);
>
> -int ir_raw_event_handle(struct input_dev *input_dev)
> +/**
> + * ir_raw_event_handle() - schedules the decoding of stored ir data
> + * @input_dev: the struct input_dev device descriptor
> + *
> + * This routine will signal the workqueue to start decoding stored ir data.
> + */
> +void 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 ev;
> - 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(ev);
> - if (!len)
> - return 0;
> -
> - for (i = 0; i < len; i++) {
> - rc = kfifo_out(&ir->raw->kfifo, &ev, sizeof(ev));
> - if (rc != sizeof(ev)) {
> - IR_dprintk(1, "overflow error: received %d instead of
> %zd\n",
> - rc, sizeof(ev));
> - return -EINVAL;
> - }
> - IR_dprintk(2, "event type %d, time before event: %07luus\n",
> - ev.type, (ev.delta.tv_nsec + 500) / 1000);
> - rc = RUN_DECODER(decode, input_dev, &ev);
> - }
> + struct ir_input_dev *ir = input_get_drvdata(input_dev);
>
> - /*
> - * Call all ir decoders. This allows decoding the same event with
> - * more than one protocol handler.
> - */
> + if (!ir->raw)
> + return;
>
> - return rc;
> + schedule_work(&ir->raw->rx_work);
> }
> EXPORT_SYMBOL_GPL(ir_raw_event_handle);
>
> Index: ir/include/media/ir-core.h
> ===================================================================
> --- ir.orig/include/media/ir-core.h 2010-04-08 12:30:28.000000000 +0200
> +++ ir/include/media/ir-core.h 2010-04-08 13:25:43.761137406 +0200
> @@ -65,14 +65,12 @@
> void (*close)(void *priv);
> };
>
> -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 work_struct rx_work; /* for the rx decoding
> workqueue */
> + struct kfifo kfifo; /* fifo for the
> pulse/space durations */
> + ktime_t last_event; /* when last event
> occurred */
> + enum raw_event_type last_type; /* last event type */
> + struct input_dev *input_dev; /* pointer to the
> parent input_dev */
> };
>
> struct ir_input_dev {
> @@ -97,8 +95,7 @@
> struct ir_raw_handler {
> struct list_head list;
>
> - int (*decode)(struct input_dev *input_dev,
> - struct ir_raw_event *ev);
> + int (*decode)(struct input_dev *input_dev, s64 duration);
> int (*raw_register)(struct input_dev *input_dev);
> int (*raw_unregister)(struct input_dev *input_dev);
> };
> @@ -154,8 +151,13 @@
> /* 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);
> +void ir_raw_event_handle(struct input_dev *input_dev);
> +int ir_raw_event_store(struct input_dev *input_dev, s64 duration);
> +int ir_raw_event_store_edge(struct input_dev *input_dev, enum raw_event_type
> type);
> +static inline void ir_raw_event_reset(struct input_dev *input_dev) {
> + ir_raw_event_store(input_dev, 0);
> + ir_raw_event_handle(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);
> void ir_raw_init(void);
> @@ -174,4 +176,26 @@
> #define load_rc5_decode() 0
> #endif
>
> +/* macros for ir decoders */
> +#define PULSE(units) ((units))
> +#define SPACE(units) (-(units))
> +#define IS_RESET(duration) ((duration) == 0)
> +#define IS_PULSE(duration) ((duration) > 0)
> +#define IS_SPACE(duration) ((duration) < 0)
> +#define DURATION(duration) (abs((duration)))
> +#define IS_TRANSITION(x ,y) ((x) * (y) < 0)
> +#define DECREASE_DURATION(duration, amount) \
> + do { \
> + if (IS_SPACE(duration)) \
> + duration += (amount); \
> + else if (IS_PULSE(duration)) \
> + duration -= (amount); \
> + } while(0)
> +
> +#define TO_UNITS(duration, unit_len) \
> + ((int)((duration) > 0 ? \
> + DIV_ROUND_CLOSEST(abs((duration)), (unit_len)) :\
> + - DIV_ROUND_CLOSEST(abs((duration)), (unit_len))))
> +#define TO_US(duration) ((int)TO_UNITS(duration, 1000))
> +
> #endif /* _IR_CORE */
> Index: ir/drivers/media/IR/ir-nec-decoder.c
> ===================================================================
> --- ir.orig/drivers/media/IR/ir-nec-decoder.c 2010-04-08 12:30:28.000000000
> +0200
> +++ ir/drivers/media/IR/ir-nec-decoder.c 2010-04-08 12:35:02.276484204
> +0200
> @@ -13,15 +13,16 @@
> */
>
> #include <media/ir-core.h>
> +#include <linux/bitrev.h>
>
> #define NEC_NBITS 32
> -#define NEC_UNIT 559979 /* ns */
> -#define NEC_HEADER_MARK (16 * NEC_UNIT)
> -#define NEC_HEADER_SPACE (8 * NEC_UNIT)
> -#define NEC_REPEAT_SPACE (4 * NEC_UNIT)
> -#define NEC_MARK (NEC_UNIT)
> -#define NEC_0_SPACE (NEC_UNIT)
> -#define NEC_1_SPACE (3 * NEC_UNIT)
> +#define NEC_UNIT 562500 /* ns */
> +#define NEC_HEADER_PULSE PULSE(16)
> +#define NEC_HEADER_SPACE SPACE(8)
> +#define NEC_REPEAT_SPACE SPACE(4)
> +#define NEC_BIT_PULSE PULSE(1)
> +#define NEC_BIT_0_SPACE SPACE(1)
> +#define NEC_BIT_1_SPACE SPACE(3)
>
> /* Used to register nec_decoder clients */
> static LIST_HEAD(decoder_list);
> @@ -29,21 +30,13 @@
>
> enum nec_state {
> STATE_INACTIVE,
> - STATE_HEADER_MARK,
> STATE_HEADER_SPACE,
> - STATE_MARK,
> - STATE_SPACE,
> - STATE_TRAILER_MARK,
> + STATE_BIT_PULSE,
> + STATE_BIT_SPACE,
> + STATE_TRAILER_PULSE,
> STATE_TRAILER_SPACE,
> };
>
> -struct nec_code {
> - u8 address;
> - u8 not_address;
> - u8 command;
> - u8 not_command;
> -};
> -
> struct decoder_data {
> struct list_head list;
> struct ir_input_dev *ir_dev;
> @@ -51,7 +44,7 @@
>
> /* State machine control */
> enum nec_state state;
> - struct nec_code nec_code;
> + u32 nec_bits;
> unsigned count;
> };
>
> @@ -62,7 +55,6 @@
> *
> * 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;
> @@ -123,20 +115,20 @@
> .attrs = decoder_attributes,
> };
>
> -
> /**
> * ir_nec_decode() - Decode one NEC pulse or space
> * @input_dev: the struct input_dev descriptor of the device
> - * @ev: event array with type/duration of pulse/space
> + * @duration: duration in ns of pulse/space
> *
> * This function returns -EINVAL if the pulse violates the state machine
> */
> -static int ir_nec_decode(struct input_dev *input_dev,
> - struct ir_raw_event *ev)
> +static int ir_nec_decode(struct input_dev *input_dev, s64 duration)
> {
> struct decoder_data *data;
> struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
> - int bit, last_bit;
> + int u;
> + u32 scancode;
> + u8 address, not_address, command, not_command;
>
> data = get_decoder_data(ir_dev);
> if (!data)
> @@ -145,150 +137,107 @@
> if (!data->enabled)
> return 0;
>
> - /* Except for the initial event, what matters is the previous bit */
> - bit = (ev->type & IR_PULSE) ? 1 : 0;
> -
> - last_bit = !bit;
> -
> - /* Discards spurious space last_bits when inactive */
> -
> - /* Very long delays are considered as start events */
> - if (ev->delta.tv_nsec > NEC_HEADER_MARK + NEC_HEADER_SPACE - NEC_UNIT /
> 2)
> + if (IS_RESET(duration)) {
> data->state = STATE_INACTIVE;
> + return 0;
> + }
>
> - if (ev->type & IR_START_EVENT)
> - data->state = STATE_INACTIVE;
> + u = TO_UNITS(duration, NEC_UNIT);
> + if (DURATION(u) == 0)
> + goto out;
> +
> + IR_dprintk(2, "NEC decode started at state %d (%i units, %ius)\n",
> + data->state, u, TO_US(duration));
>
> switch (data->state) {
> - case STATE_INACTIVE:
> - if (!bit) /* PULSE marks the start event */
> - return 0;
>
> - data->count = 0;
> - data->state = STATE_HEADER_MARK;
> - memset (&data->nec_code, 0, sizeof(data->nec_code));
> - return 0;
> - case STATE_HEADER_MARK:
> - if (!last_bit)
> - goto err;
> - if (ev->delta.tv_nsec < NEC_HEADER_MARK - 6 * NEC_UNIT)
> - goto err;
> - data->state = STATE_HEADER_SPACE;
> + case STATE_INACTIVE:
> + if (u == NEC_HEADER_PULSE) {
> + data->count = 0;
> + data->state = STATE_HEADER_SPACE;
> + }
> return 0;
> +
> case STATE_HEADER_SPACE:
> - if (last_bit)
> - goto err;
> - if (ev->delta.tv_nsec >= NEC_HEADER_SPACE - NEC_UNIT / 2) {
> - data->state = STATE_MARK;
> + if (u == NEC_HEADER_SPACE) {
> + data->state = STATE_BIT_PULSE;
> return 0;
> - }
> -
> - if (ev->delta.tv_nsec >= NEC_REPEAT_SPACE - NEC_UNIT / 2) {
> + } else if (u == NEC_REPEAT_SPACE) {
> ir_repeat(input_dev);
> IR_dprintk(1, "Repeat last key\n");
> - data->state = STATE_TRAILER_MARK;
> + data->state = STATE_TRAILER_PULSE;
> return 0;
> }
> - goto err;
> - case STATE_MARK:
> - if (!last_bit)
> - goto err;
> - if ((ev->delta.tv_nsec > NEC_MARK + NEC_UNIT / 2) ||
> - (ev->delta.tv_nsec < NEC_MARK - NEC_UNIT / 2))
> - goto err;
> - data->state = STATE_SPACE;
> - return 0;
> - case STATE_SPACE:
> - if (last_bit)
> - goto err;
> -
> - if ((ev->delta.tv_nsec >= NEC_0_SPACE - NEC_UNIT / 2) &&
> - (ev->delta.tv_nsec < NEC_0_SPACE + NEC_UNIT / 2))
> - bit = 0;
> - else if ((ev->delta.tv_nsec >= NEC_1_SPACE - NEC_UNIT / 2) &&
> - (ev->delta.tv_nsec < NEC_1_SPACE + NEC_UNIT / 2))
> - bit = 1;
> - else {
> - IR_dprintk(1, "Decode failed at %d-th bit (%s)
> @%luus\n",
> - data->count,
> - last_bit ? "pulse" : "space",
> - (ev->delta.tv_nsec + 500) / 1000);
> + break;
> +
> + case STATE_BIT_PULSE:
> + if (u == NEC_BIT_PULSE) {
> + data->state = STATE_BIT_SPACE;
> + return 0;
> + }
> + break;
> +
> + case STATE_BIT_SPACE:
> + if (u != NEC_BIT_0_SPACE && u != NEC_BIT_1_SPACE)
> + break;
>
> - goto err2;
> + data->nec_bits <<= 1;
> + if (u == NEC_BIT_1_SPACE)
> + data->nec_bits |= 1;
> + data->count++;
> +
> + if (data->count != NEC_NBITS) {
> + data->state = STATE_BIT_PULSE;
> + return 0;
> }
>
> - /* Ok, we've got a valid bit. proccess it */
> - if (bit) {
> - int shift = data->count;
> -
> - /*
> - * NEC transmit bytes on this temporal order:
> - * address | not address | command | not command
> - */
> - if (shift < 8) {
> - data->nec_code.address |= 1 << shift;
> - } else if (shift < 16) {
> - data->nec_code.not_address |= 1 << (shift - 8);
> - } else if (shift < 24) {
> - data->nec_code.command |= 1 << (shift - 16);
> - } else {
> - data->nec_code.not_command |= 1 << (shift - 24);
> - }
> + address = bitrev8((data->nec_bits >> 24) & 0xff);
> + not_address = bitrev8((data->nec_bits >> 16) & 0xff);
> + command = bitrev8((data->nec_bits >> 8) & 0xff);
> + not_command = bitrev8((data->nec_bits >> 0) & 0xff);
> +
> + if ((command ^ not_command) != 0xff) {
> + IR_dprintk(1, "NEC checksum error: received 0x%08x\n",
> + data->nec_bits);
> + break;
> }
> - if (++data->count == NEC_NBITS) {
> - u32 scancode;
> - /*
> - * Fixme: may need to accept Extended NEC protocol?
> - */
> - if ((data->nec_code.command ^
> data->nec_code.not_command) != 0xff)
> - goto checksum_err;
> -
> - if ((data->nec_code.address ^
> data->nec_code.not_address) != 0xff) {
> - /* Extended NEC */
> - scancode = data->nec_code.address << 16 |
> - data->nec_code.not_address << 8 |
> - data->nec_code.command;
> - IR_dprintk(1, "NEC scancode 0x%06x\n",
> scancode);
> - } else {
> - /* normal NEC */
> - scancode = data->nec_code.address << 8 |
> - data->nec_code.command;
> - IR_dprintk(1, "NEC scancode 0x%04x\n",
> scancode);
> - }
> - ir_keydown(input_dev, scancode, 0);
> -
> - data->state = STATE_TRAILER_MARK;
> - } else
> - data->state = STATE_MARK;
> - return 0;
> - case STATE_TRAILER_MARK:
> - if (!last_bit)
> - goto err;
> - data->state = STATE_TRAILER_SPACE;
> +
> + if ((address ^ not_address) != 0xff) {
> + /* Extended NEC */
> + scancode = address << 16 |
> + not_address << 8 |
> + command;
> + IR_dprintk(1, "NEC (Ext) scancode 0x%06x\n", scancode);
> + } else {
> + /* normal NEC */
> + scancode = address << 8 | command;
> + IR_dprintk(1, "NEC scancode 0x%04x\n", scancode);
> + }
> +
> + ir_keydown(input_dev, scancode, 0);
> + data->state = STATE_TRAILER_PULSE;
> return 0;
> +
> + case STATE_TRAILER_PULSE:
> + if (u > 0) {
> + data->state = STATE_TRAILER_SPACE;
> + return 0;
> + }
> + break;
> +
> case STATE_TRAILER_SPACE:
> - if (last_bit)
> - goto err;
> - data->state = STATE_INACTIVE;
> - return 0;
> - }
> + if (u < 0) {
> + data->state = STATE_INACTIVE;
> + return 0;
> + }
>
> -err:
> - IR_dprintk(1, "NEC decoded failed at state %d (%s) @ %luus\n",
> - data->state,
> - bit ? "pulse" : "space",
> - (ev->delta.tv_nsec + 500) / 1000);
> -err2:
> - data->state = STATE_INACTIVE;
> - return -EINVAL;
> + break;
> + }
>
> -checksum_err:
> +out:
> + IR_dprintk(1, "NEC decode failed at state %d (%i units, %ius)\n",
> + data->state, u, TO_US(duration));
> data->state = STATE_INACTIVE;
> - IR_dprintk(1, "NEC checksum error: received 0x%02x%02x%02x%02x\n",
> - data->nec_code.address,
> - data->nec_code.not_address,
> - data->nec_code.command,
> - data->nec_code.not_command);
> return -EINVAL;
> }
>
> Index: ir/drivers/media/IR/ir-rc5-decoder.c
> ===================================================================
> --- ir.orig/drivers/media/IR/ir-rc5-decoder.c 2010-04-08 12:30:28.000000000
> +0200
> +++ ir/drivers/media/IR/ir-rc5-decoder.c 2010-04-08 12:48:28.361137494
> +0200
> @@ -21,11 +21,8 @@
>
> #include <media/ir-core.h>
>
> -static unsigned int ir_rc5_remote_gap = 888888;
> -
> #define RC5_NBITS 14
> -#define RC5_BIT (ir_rc5_remote_gap * 2)
> -#define RC5_DURATION (ir_rc5_remote_gap * RC5_NBITS)
> +#define RC5_UNIT 888888 /* ns */
>
> /* Used to register rc5_decoder clients */
> static LIST_HEAD(decoder_list);
> @@ -33,13 +30,9 @@
>
> enum rc5_state {
> STATE_INACTIVE,
> - STATE_MARKSPACE,
> - STATE_TRAILER,
> -};
> -
> -struct rc5_code {
> - u8 address;
> - u8 command;
> + STATE_BIT_START,
> + STATE_BIT_END,
> + STATE_FINISHED,
> };
>
> struct decoder_data {
> @@ -49,8 +42,9 @@
>
> /* State machine control */
> enum rc5_state state;
> - struct rc5_code rc5_code;
> - unsigned code, elapsed, last_bit, last_code;
> + u32 rc5_bits;
> + int last_unit;
> + unsigned count;
> };
>
>
> @@ -122,18 +116,19 @@
> };
>
> /**
> - * 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
> + * @duration: duration of pulse/space in ns
> *
> * 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, s64 duration)
> {
> struct decoder_data *data;
> struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
> - int is_pulse, scancode, delta, toggle;
> + u8 command, system, toggle;
> + u32 scancode;
> + int u;
>
> data = get_decoder_data(ir_dev);
> if (!data)
> @@ -142,79 +137,84 @@
> if (!data->enabled)
> 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;
> -
> - /* Very long delays are considered as start events */
> - if (delta > RC5_DURATION || (ev->type & IR_START_EVENT))
> + if (IS_RESET(duration)) {
> data->state = STATE_INACTIVE;
> -
> - 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;
> return 0;
> - case STATE_MARKSPACE:
> - if (delta != 1)
> - data->last_bit = data->last_bit ? 0 : 1;
> + }
>
> - data->elapsed += delta;
> + u = TO_UNITS(duration, RC5_UNIT);
> + if (DURATION(u) == 0)
> + goto out;
> +
> +again:
> + IR_dprintk(2, "RC5 decode started at state %i (%i units, %ius)\n",
> + data->state, u, TO_US(duration));
>
> - if ((data->elapsed % 2) == 1)
> - return 0;
> + if (DURATION(u) == 0 && data->state != STATE_FINISHED)
> + return 0;
> +
> + switch (data->state) {
>
> - data->code <<= 1;
> - data->code |= data->last_bit;
> + case STATE_INACTIVE:
> + if (IS_PULSE(u)) {
> + data->state = STATE_BIT_START;
> + data->count = 1;
> + DECREASE_DURATION(u, 1);
> + goto again;
> + }
> + break;
>
> - /* Fill the 2 unused bits at the command with 0 */
> - if (data->elapsed / 2 == 6)
> - data->code <<= 2;
> -
> - if (data->elapsed >= (RC5_NBITS - 1) * 2) {
> - scancode = data->code;
> -
> - /* 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_START:
> + if (DURATION(u) == 1) {
> + data->rc5_bits <<= 1;
> + if (IS_SPACE(u))
> + data->rc5_bits |= 1;
> + data->count++;
> + data->last_unit = u;
> +
> + /*
> + * If the last bit is zero, a space will merge
> + * with the silence after the command.
> + */
> + if (IS_PULSE(u) && data->count == RC5_NBITS) {
> + data->state = STATE_FINISHED;
> + goto again;
> }
>
> - toggle = (scancode & 0x2000) ? 1 : 0;
> + data->state = STATE_BIT_END;
> + return 0;
> + }
> + break;
>
> - 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_BIT_END:
> + if (IS_TRANSITION(u, data->last_unit)) {
> + if (data->count == RC5_NBITS)
> + data->state = STATE_FINISHED;
> + else
> + data->state = STATE_BIT_START;
>
> - ir_keydown(input_dev, scancode, 0);
> - }
> - data->state = STATE_TRAILER;
> + DECREASE_DURATION(u, 1);
> + goto again;
> }
> - return 0;
> - case STATE_TRAILER:
> + break;
> +
> + case STATE_FINISHED:
> + command = (data->rc5_bits & 0x0003F) >> 0;
> + system = (data->rc5_bits & 0x007C0) >> 6;
> + toggle = (data->rc5_bits & 0x00800) ? 1 : 0;
> + command += (data->rc5_bits & 0x01000) ? 0 : 0x40;
> + scancode = system << 8 | command;
> +
> + IR_dprintk(1, "RC5 scancode 0x%04x (toggle: %u)\n",
> + scancode, toggle);
> + 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 decode failed at state %i (%i units, %ius)\n",
> + data->state, u, TO_US(duration));
> data->state = STATE_INACTIVE;
> return -EINVAL;
> }
> Index: ir/drivers/media/video/saa7134/saa7134-input.c
> ===================================================================
> --- ir.orig/drivers/media/video/saa7134/saa7134-input.c 2010-04-08
> 12:30:28.000000000 +0200
> +++ ir/drivers/media/video/saa7134/saa7134-input.c 2010-04-08
> 12:31:07.697096148 +0200
> @@ -1018,7 +1018,7 @@
> saa_clearb(SAA7134_GPIO_GPMODE3, SAA7134_GPIO_GPRESCAN);
> saa_setb(SAA7134_GPIO_GPMODE3, SAA7134_GPIO_GPRESCAN);
> space = saa_readl(SAA7134_GPIO_GPSTATUS0 >> 2) & ir->mask_keydown;
> - ir_raw_event_store(dev->remote->dev, space ? IR_SPACE : IR_PULSE);
> + ir_raw_event_store_edge(dev->remote->dev, space ? IR_SPACE : IR_PULSE);
>
>
> /*
>
--
Cheers,
Mauro
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