diff options
author | Maxim Levitsky <maximlevitsky@gmail.com> | 2010-07-31 11:59:22 -0300 |
---|---|---|
committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-08-08 23:43:00 -0300 |
commit | 4a702ebf61120906696f8366dd2be0653b1643e3 (patch) | |
tree | d83d2662edcf538ebcb6bac103bdcadbed430426 /drivers/media/IR/ir-raw-event.c | |
parent | b378f43fe9466e7712a8b16be64795ffca3a937e (diff) |
V4L/DVB: IR: add helper function for hardware with small o/b buffer
Some ir input devices have small buffer, and interrupt the host
each time it is full (or half full)
Add a helper that automaticly handles timeouts, and also
automaticly merges samples of same time (space-space)
Such samples might be placed by hardware because size of
sample in the buffer is small (a byte for example).
Also remove constness from ir_dev_props, because it now contains timeout
settings that driver might want to change
Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Acked-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/IR/ir-raw-event.c')
-rw-r--r-- | drivers/media/IR/ir-raw-event.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/drivers/media/IR/ir-raw-event.c b/drivers/media/IR/ir-raw-event.c index d0c18db4c0d3..43094e7eccfa 100644 --- a/drivers/media/IR/ir-raw-event.c +++ b/drivers/media/IR/ir-raw-event.c @@ -140,6 +140,90 @@ int ir_raw_event_store_edge(struct input_dev *input_dev, enum raw_event_type typ EXPORT_SYMBOL_GPL(ir_raw_event_store_edge); /** + * ir_raw_event_store_with_filter() - pass next pulse/space to decoders with some processing + * @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) works + * in similiar manner to ir_raw_event_store_edge. + * This routine is intended for devices with limited internal buffer + * It automerges samples of same type, and handles timeouts + */ +int ir_raw_event_store_with_filter(struct input_dev *input_dev, + struct ir_raw_event *ev) +{ + struct ir_input_dev *ir = input_get_drvdata(input_dev); + struct ir_raw_event_ctrl *raw = ir->raw; + + if (!raw || !ir->props) + return -EINVAL; + + /* Ignore spaces in idle mode */ + if (ir->idle && !ev->pulse) + return 0; + else if (ir->idle) + ir_raw_event_set_idle(input_dev, 0); + + if (!raw->this_ev.duration) { + raw->this_ev = *ev; + } else if (ev->pulse == raw->this_ev.pulse) { + raw->this_ev.duration += ev->duration; + } else { + ir_raw_event_store(input_dev, &raw->this_ev); + raw->this_ev = *ev; + } + + /* Enter idle mode if nessesary */ + if (!ev->pulse && ir->props->timeout && + raw->this_ev.duration >= ir->props->timeout) + ir_raw_event_set_idle(input_dev, 1); + return 0; +} +EXPORT_SYMBOL_GPL(ir_raw_event_store_with_filter); + +void ir_raw_event_set_idle(struct input_dev *input_dev, int idle) +{ + struct ir_input_dev *ir = input_get_drvdata(input_dev); + struct ir_raw_event_ctrl *raw = ir->raw; + ktime_t now; + u64 delta; + + if (!ir->props) + return; + + if (!ir->raw) + goto out; + + if (idle) { + IR_dprintk(2, "enter idle mode\n"); + raw->last_event = ktime_get(); + } else { + IR_dprintk(2, "exit idle mode\n"); + + now = ktime_get(); + delta = ktime_to_ns(ktime_sub(now, ir->raw->last_event)); + + WARN_ON(raw->this_ev.pulse); + + raw->this_ev.duration = + min(raw->this_ev.duration + delta, + (u64)IR_MAX_DURATION); + + ir_raw_event_store(input_dev, &raw->this_ev); + + if (raw->this_ev.duration == IR_MAX_DURATION) + ir_raw_event_reset(input_dev); + + raw->this_ev.duration = 0; + } +out: + if (ir->props->s_idle) + ir->props->s_idle(ir->props->priv, idle); + ir->idle = idle; +} +EXPORT_SYMBOL_GPL(ir_raw_event_set_idle); + +/** * ir_raw_event_handle() - schedules the decoding of stored ir data * @input_dev: the struct input_dev device descriptor * |