diff options
author | David S. Miller <davem@davemloft.net> | 2010-09-08 23:49:04 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2010-09-08 23:49:04 -0700 |
commit | e199e6136ce6b151e6638ae93dca60748424d900 (patch) | |
tree | 0d66e0b5d227c36b005e4f5537f4bbcfc6ed4904 /drivers/media/IR/ir-raw-event.c | |
parent | 972c40b5bee429c84ba727f8ac0a08292bc5dc3d (diff) | |
parent | d56557af19867edb8c0e96f8e26399698a08857f (diff) |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'drivers/media/IR/ir-raw-event.c')
-rw-r--r-- | drivers/media/IR/ir-raw-event.c | 159 |
1 files changed, 133 insertions, 26 deletions
diff --git a/drivers/media/IR/ir-raw-event.c b/drivers/media/IR/ir-raw-event.c index 6f192ef31db..43094e7eccf 100644 --- a/drivers/media/IR/ir-raw-event.c +++ b/drivers/media/IR/ir-raw-event.c @@ -12,9 +12,10 @@ * GNU General Public License for more details. */ -#include <linux/workqueue.h> -#include <linux/spinlock.h> +#include <linux/kthread.h> +#include <linux/mutex.h> #include <linux/sched.h> +#include <linux/freezer.h> #include "ir-core-priv.h" /* Define the max number of pulse/space transitions to buffer */ @@ -24,7 +25,7 @@ static LIST_HEAD(ir_raw_client_list); /* Used to handle IR raw handler extensions */ -static DEFINE_SPINLOCK(ir_raw_handler_lock); +static DEFINE_MUTEX(ir_raw_handler_lock); static LIST_HEAD(ir_raw_handler_list); static u64 available_protocols; @@ -33,20 +34,30 @@ static u64 available_protocols; static struct work_struct wq_load; #endif -static void ir_raw_event_work(struct work_struct *work) +static int ir_raw_event_thread(void *data) { struct ir_raw_event ev; struct ir_raw_handler *handler; - struct ir_raw_event_ctrl *raw = - container_of(work, struct ir_raw_event_ctrl, rx_work); - - while (kfifo_out(&raw->kfifo, &ev, sizeof(ev)) == sizeof(ev)) { - spin_lock(&ir_raw_handler_lock); - list_for_each_entry(handler, &ir_raw_handler_list, list) - handler->decode(raw->input_dev, ev); - spin_unlock(&ir_raw_handler_lock); - raw->prev_ev = ev; + struct ir_raw_event_ctrl *raw = (struct ir_raw_event_ctrl *)data; + + while (!kthread_should_stop()) { + try_to_freeze(); + + mutex_lock(&ir_raw_handler_lock); + + while (kfifo_out(&raw->kfifo, &ev, sizeof(ev)) == sizeof(ev)) { + list_for_each_entry(handler, &ir_raw_handler_list, list) + handler->decode(raw->input_dev, ev); + raw->prev_ev = ev; + } + + mutex_unlock(&ir_raw_handler_lock); + + set_current_state(TASK_INTERRUPTIBLE); + schedule(); } + + return 0; } /** @@ -66,6 +77,9 @@ int ir_raw_event_store(struct input_dev *input_dev, struct ir_raw_event *ev) if (!ir->raw) return -EINVAL; + IR_dprintk(2, "sample: (05%dus %s)\n", + TO_US(ev->duration), TO_STR(ev->pulse)); + if (kfifo_in(&ir->raw->kfifo, ev, sizeof(*ev)) != sizeof(*ev)) return -ENOMEM; @@ -126,6 +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 * @@ -138,7 +236,7 @@ void ir_raw_event_handle(struct input_dev *input_dev) if (!ir->raw) return; - schedule_work(&ir->raw->rx_work); + wake_up_process(ir->raw->thread); } EXPORT_SYMBOL_GPL(ir_raw_event_handle); @@ -147,9 +245,9 @@ u64 ir_raw_get_allowed_protocols() { u64 protocols; - spin_lock(&ir_raw_handler_lock); + mutex_lock(&ir_raw_handler_lock); protocols = available_protocols; - spin_unlock(&ir_raw_handler_lock); + mutex_unlock(&ir_raw_handler_lock); return protocols; } @@ -167,7 +265,7 @@ int ir_raw_event_register(struct input_dev *input_dev) return -ENOMEM; ir->raw->input_dev = input_dev; - INIT_WORK(&ir->raw->rx_work, ir_raw_event_work); + ir->raw->enabled_protocols = ~0; rc = kfifo_alloc(&ir->raw->kfifo, sizeof(s64) * MAX_IR_EVENT_SIZE, GFP_KERNEL); @@ -177,12 +275,21 @@ int ir_raw_event_register(struct input_dev *input_dev) return rc; } - spin_lock(&ir_raw_handler_lock); + ir->raw->thread = kthread_run(ir_raw_event_thread, ir->raw, + "rc%u", (unsigned int)ir->devno); + + if (IS_ERR(ir->raw->thread)) { + kfree(ir->raw); + ir->raw = NULL; + return PTR_ERR(ir->raw->thread); + } + + mutex_lock(&ir_raw_handler_lock); list_add_tail(&ir->raw->list, &ir_raw_client_list); list_for_each_entry(handler, &ir_raw_handler_list, list) if (handler->raw_register) handler->raw_register(ir->raw->input_dev); - spin_unlock(&ir_raw_handler_lock); + mutex_unlock(&ir_raw_handler_lock); return 0; } @@ -195,14 +302,14 @@ void ir_raw_event_unregister(struct input_dev *input_dev) if (!ir->raw) return; - cancel_work_sync(&ir->raw->rx_work); + kthread_stop(ir->raw->thread); - spin_lock(&ir_raw_handler_lock); + mutex_lock(&ir_raw_handler_lock); list_del(&ir->raw->list); list_for_each_entry(handler, &ir_raw_handler_list, list) if (handler->raw_unregister) handler->raw_unregister(ir->raw->input_dev); - spin_unlock(&ir_raw_handler_lock); + mutex_unlock(&ir_raw_handler_lock); kfifo_free(&ir->raw->kfifo); kfree(ir->raw); @@ -217,13 +324,13 @@ int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler) { struct ir_raw_event_ctrl *raw; - spin_lock(&ir_raw_handler_lock); + mutex_lock(&ir_raw_handler_lock); list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list); if (ir_raw_handler->raw_register) list_for_each_entry(raw, &ir_raw_client_list, list) ir_raw_handler->raw_register(raw->input_dev); available_protocols |= ir_raw_handler->protocols; - spin_unlock(&ir_raw_handler_lock); + mutex_unlock(&ir_raw_handler_lock); return 0; } @@ -233,13 +340,13 @@ void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler) { struct ir_raw_event_ctrl *raw; - spin_lock(&ir_raw_handler_lock); + mutex_lock(&ir_raw_handler_lock); list_del(&ir_raw_handler->list); if (ir_raw_handler->raw_unregister) list_for_each_entry(raw, &ir_raw_client_list, list) ir_raw_handler->raw_unregister(raw->input_dev); available_protocols &= ~ir_raw_handler->protocols; - spin_unlock(&ir_raw_handler_lock); + mutex_unlock(&ir_raw_handler_lock); } EXPORT_SYMBOL(ir_raw_handler_unregister); |