On Thu, 2010-04-08 at 13:39 +0200, David Härdeman wrote: > 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)) Encoding pulse vs space with a negative sign, even if now hidden with macros, is still just using a sign instead of a boolean. Memory in modern computers (and now microcontrollers) is cheap and only getting cheaper. Don't give up readability, flexibility, or mainatainability, for the sake of saving memory. > +#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 */ Have you got a spec on the NEC protocol that justifies 562.5 usec? >From the best I can tell from the sources I have read and some deductive reasoning, 560 usec is the actual number. Here's one: http://www.audiodevelopers.com/temp/Remote_Controls.ppt Note: 560 usec * 38 kHz ~= 4192/197 and that the three numbers that yield ~560 usec don't evenly divide each other: $ factor 4192 197 38000 4192: 2 2 2 2 2 131 197: 197 38000: 2 2 2 2 5 5 5 19 which strikes me as being done on purpose (maybe only by me?). Also note that: 4192 / 38 kHz = 110.32 usec and public sources list 110 usec as the NEC repeat period. > +#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) This is slightly better than your previous patch, but the original #defines were still clearer. A maintainer coming through has to spend time and energy on asking "16 what?" for example. While I'm on the subject of maintainability: It would be better to convert #defines into "const int"s within a function scope, if these defines are only used in one function and file scope is unneeded. > /* 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) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ (example compile-time constant) > + 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); ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Why are 2 run-time divisons and 2 run-time abs() invocations for every measurment preferrable to comparisons to compile-time constants? Your TO_UNITS(), IS_SPACE(), etc. macros help with the readability and maintainability over your previously proposed change, but you're still having the CPU do extra work over what was done before. Regards, Andy > + 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); > > > /* > -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html