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V4L/DVB: ir-core: improve keyup/keydown logic 

Rewrites the keyup/keydown logic in drivers/media/IR/ir-keytable.c.

All knowledge of keystates etc is now internal to ir-keytable.c
and not scattered around ir-raw-event.c and ir-nec-decoder.c (where
it doesn't belong).

In addition, I've changed the API slightly so that ir_input_dev is
passed as the first argument rather than input_dev. If we're ever
going to support multiple keytables we need to move towards making
ir_input_dev the main interface from a driver POV and obscure away
the input_dev as an implementational detail in ir-core.

Signed-off-by: David Härdeman <david@hardeman.nu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
David Härdeman 2010-04-02 15:58:29 -03:00 committed by Mauro Carvalho Chehab
parent 354389467b
commit a374fef443
4 changed files with 114 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

127
drivers/media/IR/ir-keytable.c
View File

@ -21,6 +21,9 @@
#define IR_TAB_MIN_SIZE 256
#define IR_TAB_MAX_SIZE 8192
/* FIXME: IR_KEYPRESS_TIMEOUT should be protocol specific */
#define IR_KEYPRESS_TIMEOUT 250
/**
* ir_resize_table() - resizes a scancode table if necessary
* @rc_tab: the ir_scancode_table to resize
@ -263,56 +266,124 @@ EXPORT_SYMBOL_GPL(ir_g_keycode_from_table);
/**
* ir_keyup() - generates input event to cleanup a key press
* @input_dev: the struct input_dev descriptor of the device
* @ir: the struct ir_input_dev descriptor of the device
*
* This routine is used by the input routines when a key is pressed at the
* IR. It reports a keyup input event via input_report_key().
* This routine is used to signal that a key has been released on the
* remote control. It reports a keyup input event via input_report_key().
*/
void ir_keyup(struct input_dev *dev)
static void ir_keyup(struct ir_input_dev *ir)
{
struct ir_input_dev *ir = input_get_drvdata(dev);
if (!ir->keypressed)
return;
IR_dprintk(1, "keyup key 0x%04x\n", ir->keycode);
input_report_key(dev, ir->keycode, 0);
input_sync(dev);
ir->keypressed = 0;
IR_dprintk(1, "keyup key 0x%04x\n", ir->last_keycode);
input_report_key(ir->input_dev, ir->last_keycode, 0);
input_sync(ir->input_dev);
ir->keypressed = false;
}
EXPORT_SYMBOL_GPL(ir_keyup);
/**
* ir_timer_keyup() - generates a keyup event after a timeout
* @cookie: a pointer to struct ir_input_dev passed to setup_timer()
*
* This routine will generate a keyup event some time after a keydown event
* is generated when no further activity has been detected.
*/
static void ir_timer_keyup(unsigned long cookie)
{
struct ir_input_dev *ir = (struct ir_input_dev *)cookie;
unsigned long flags;
/*
* ir->keyup_jiffies is used to prevent a race condition if a
* hardware interrupt occurs at this point and the keyup timer
* event is moved further into the future as a result.
*
* The timer will then be reactivated and this function called
* again in the future. We need to exit gracefully in that case
* to allow the input subsystem to do its auto-repeat magic or
* a keyup event might follow immediately after the keydown.
*/
spin_lock_irqsave(&ir->keylock, flags);
if (time_is_after_eq_jiffies(ir->keyup_jiffies))
ir_keyup(ir);
spin_unlock_irqrestore(&ir->keylock, flags);
}
/**
* ir_repeat() - notifies the IR core that a key is still pressed
* @dev: the struct input_dev descriptor of the device
*
* This routine is used by IR decoders when a repeat message which does
* not include the necessary bits to reproduce the scancode has been
* received.
*/
void ir_repeat(struct input_dev *dev)
{
unsigned long flags;
struct ir_input_dev *ir = input_get_drvdata(dev);
spin_lock_irqsave(&ir->keylock, flags);
if (!ir->keypressed)
goto out;
ir->keyup_jiffies = jiffies + msecs_to_jiffies(IR_KEYPRESS_TIMEOUT);
mod_timer(&ir->timer_keyup, ir->keyup_jiffies);
out:
spin_unlock_irqrestore(&ir->keylock, flags);
}
EXPORT_SYMBOL_GPL(ir_repeat);
/**
* ir_keydown() - generates input event for a key press
* @input_dev: the struct input_dev descriptor of the device
* @scancode: the scancode that we're seeking
* @dev: the struct input_dev descriptor of the device
* @scancode: the scancode that we're seeking
* @toggle: the toggle value (protocol dependent, if the protocol doesn't
* support toggle values, this should be set to zero)
*
* This routine is used by the input routines when a key is pressed at the
* IR. It gets the keycode for a scancode and reports an input event via
* input_report_key().
*/
void ir_keydown(struct input_dev *dev, int scancode)
void ir_keydown(struct input_dev *dev, int scancode, u8 toggle)
{
unsigned long flags;
struct ir_input_dev *ir = input_get_drvdata(dev);
u32 keycode = ir_g_keycode_from_table(dev, scancode);
/* If already sent a keydown, do a keyup */
if (ir->keypressed)
ir_keyup(dev);
spin_lock_irqsave(&ir->keylock, flags);
if (KEY_RESERVED == keycode)
return;
/* Repeat event? */
if (ir->keypressed &&
ir->last_scancode == scancode &&
ir->last_toggle == toggle)
goto set_timer;
ir->keycode = keycode;
ir->keypressed = 1;
/* Release old keypress */
ir_keyup(ir);
ir->last_scancode = scancode;
ir->last_toggle = toggle;
ir->last_keycode = keycode;
if (keycode == KEY_RESERVED)
goto out;
/* Register a keypress */
ir->keypressed = true;
IR_dprintk(1, "%s: key down event, key 0x%04x, scancode 0x%04x\n",
dev->name, keycode, scancode);
input_report_key(dev, ir->keycode, 1);
dev->name, keycode, scancode);
input_report_key(dev, ir->last_keycode, 1);
input_sync(dev);
set_timer:
ir->keyup_jiffies = jiffies + msecs_to_jiffies(IR_KEYPRESS_TIMEOUT);
mod_timer(&ir->timer_keyup, ir->keyup_jiffies);
out:
spin_unlock_irqrestore(&ir->keylock, flags);
}
EXPORT_SYMBOL_GPL(ir_keydown);
@ -365,8 +436,12 @@ int __ir_input_register(struct input_dev *input_dev,
input_dev->getkeycode = ir_getkeycode;
input_dev->setkeycode = ir_setkeycode;
input_set_drvdata(input_dev, ir_dev);
ir_dev->input_dev = input_dev;
spin_lock_init(&ir_dev->rc_tab.lock);
spin_lock_init(&ir_dev->keylock);
setup_timer(&ir_dev->timer_keyup, ir_timer_keyup, (unsigned long)ir_dev);
ir_dev->rc_tab.name = rc_tab->name;
ir_dev->rc_tab.ir_type = rc_tab->ir_type;
ir_dev->rc_tab.alloc = roundup_pow_of_two(rc_tab->size *
@ -383,6 +458,8 @@ int __ir_input_register(struct input_dev *input_dev,
ir_dev->rc_tab.size, ir_dev->rc_tab.alloc);
set_bit(EV_KEY, input_dev->evbit);
set_bit(EV_REP, input_dev->evbit);
if (ir_setkeytable(input_dev, &ir_dev->rc_tab, rc_tab)) {
rc = -ENOMEM;
goto out_table;
@ -428,7 +505,7 @@ void ir_input_unregister(struct input_dev *dev)
return;
IR_dprintk(1, "Freed keycode table\n");
del_timer_sync(&ir_dev->timer_keyup);
rc_tab = &ir_dev->rc_tab;
rc_tab->size = 0;
kfree(rc_tab->scan);

7
drivers/media/IR/ir-nec-decoder.c
View File

@ -180,8 +180,7 @@ static int __ir_nec_decode(struct input_dev *input_dev,
if (is_repeat(evs, len, *pos)) {
*pos += 2;
if (ir->keypressed) {
mod_timer(&ir->raw->timer_keyup,
jiffies + msecs_to_jiffies(REPEAT_TIME));
ir_repeat(input_dev);
IR_dprintk(1, "NEC repeat event\n");
return 1;
} else {
@ -238,9 +237,7 @@ static int __ir_nec_decode(struct input_dev *input_dev,
}
IR_dprintk(1, "NEC scancode 0x%04x\n", ircode);
ir_keydown(input_dev, ircode);
mod_timer(&ir->raw->timer_keyup,
jiffies + msecs_to_jiffies(REPEAT_TIME));
ir_keydown(input_dev, ircode, 0);
return 1;
err:

14
drivers/media/IR/ir-raw-event.c
View File

@ -53,13 +53,6 @@ static spinlock_t ir_raw_handler_lock;
/* Used to load the decoders */
static struct work_struct wq_load;
static void ir_keyup_timer(unsigned long data)
{
struct input_dev *input_dev = (struct input_dev *)data;
ir_keyup(input_dev);
}
int ir_raw_event_register(struct input_dev *input_dev)
{
struct ir_input_dev *ir = input_get_drvdata(input_dev);
@ -72,11 +65,6 @@ int ir_raw_event_register(struct input_dev *input_dev)
size = sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE * 2;
size = roundup_pow_of_two(size);
init_timer(&ir->raw->timer_keyup);
ir->raw->timer_keyup.function = ir_keyup_timer;
ir->raw->timer_keyup.data = (unsigned long)input_dev;
set_bit(EV_REP, input_dev->evbit);
rc = kfifo_alloc(&ir->raw->kfifo, size, GFP_KERNEL);
if (rc < 0) {
kfree(ir->raw);
@ -103,8 +91,6 @@ void ir_raw_event_unregister(struct input_dev *input_dev)
if (!ir->raw)
return;
del_timer_sync(&ir->raw->timer_keyup);
RUN_DECODER(raw_unregister, input_dev);
kfifo_free(&ir->raw->kfifo);

15
include/media/ir-core.h
View File

@ -76,7 +76,6 @@ struct ir_raw_event {
struct ir_raw_event_ctrl {
struct kfifo kfifo; /* fifo for the pulse/space events */
struct timespec last_event; /* when last event occurred */
struct timer_list timer_keyup; /* timer for key release */
};
struct ir_input_dev {
@ -86,10 +85,16 @@ struct ir_input_dev {
unsigned long devno; /* device number */
const struct ir_dev_props *props; /* Device properties */
struct ir_raw_event_ctrl *raw; /* for raw pulse/space events */
struct input_dev *input_dev; /* the input device associated with this device */
/* key info - needed by IR keycode handlers */
u32 keycode; /* linux key code */
int keypressed; /* current state */
spinlock_t keylock; /* protects the below members */
bool keypressed; /* current state */
unsigned long keyup_jiffies; /* when should the current keypress be released? */
struct timer_list timer_keyup; /* timer for releasing a keypress */
u32 last_keycode; /* keycode of last command */
u32 last_scancode; /* scancode of last command */
u8 last_toggle; /* toggle of last command */
};
struct ir_raw_handler {
@ -115,8 +120,8 @@ void rc_map_init(void);
u32 ir_g_keycode_from_table(struct input_dev *input_dev,
u32 scancode);
void ir_keyup(struct input_dev *dev);
void ir_keydown(struct input_dev *dev, int scancode);
void ir_repeat(struct input_dev *dev);
void ir_keydown(struct input_dev *dev, int scancode, u8 toggle);
int __ir_input_register(struct input_dev *dev,
const struct ir_scancode_table *ir_codes,
const struct ir_dev_props *props,