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Input: media/IR - switch to using new keycode interface

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Switch the code to use new style of getkeycode and setkeycode
methods to allow retrieving and setting keycodes not only by
their scancodes but also by index.

Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2010-09-09 21:59:11 -07:00
parent 67127f3061
commit 9f47009506
2 changed files with 264 additions and 133 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

395
drivers/media/IR/ir-keytable.c
View File

@ -24,15 +24,57 @@
/* FIXME: IR_KEYPRESS_TIMEOUT should be protocol specific */
#define IR_KEYPRESS_TIMEOUT 250
/**
* ir_create_table() - initializes a scancode table
* @rc_tab: the ir_scancode_table to initialize
* @name: name to assign to the table
* @ir_type: ir type to assign to the new table
* @size: initial size of the table
* @return: zero on success or a negative error code
*
* This routine will initialize the ir_scancode_table and will allocate
* memory to hold at least the specified number elements.
*/
static int ir_create_table(struct ir_scancode_table *rc_tab,
const char *name, u64 ir_type, size_t size)
{
rc_tab->name = name;
rc_tab->ir_type = ir_type;
rc_tab->alloc = roundup_pow_of_two(size * sizeof(struct ir_scancode));
rc_tab->size = rc_tab->alloc / sizeof(struct ir_scancode);
rc_tab->scan = kmalloc(rc_tab->alloc, GFP_KERNEL);
if (!rc_tab->scan)
return -ENOMEM;
IR_dprintk(1, "Allocated space for %u keycode entries (%u bytes)\n",
rc_tab->size, rc_tab->alloc);
return 0;
}
/**
* ir_free_table() - frees memory allocated by a scancode table
* @rc_tab: the table whose mappings need to be freed
*
* This routine will free memory alloctaed for key mappings used by given
* scancode table.
*/
static void ir_free_table(struct ir_scancode_table *rc_tab)
{
rc_tab->size = 0;
kfree(rc_tab->scan);
rc_tab->scan = NULL;
}
/**
* ir_resize_table() - resizes a scancode table if necessary
* @rc_tab: the ir_scancode_table to resize
* @gfp_flags: gfp flags to use when allocating memory
* @return: zero on success or a negative error code
*
* This routine will shrink the ir_scancode_table if it has lots of
* unused entries and grow it if it is full.
*/
static int ir_resize_table(struct ir_scancode_table *rc_tab)
static int ir_resize_table(struct ir_scancode_table *rc_tab, gfp_t gfp_flags)
{
unsigned int oldalloc = rc_tab->alloc;
unsigned int newalloc = oldalloc;
@ -57,7 +99,7 @@ static int ir_resize_table(struct ir_scancode_table *rc_tab)
if (newalloc == oldalloc)
return 0;
newscan = kmalloc(newalloc, GFP_ATOMIC);
newscan = kmalloc(newalloc, gfp_flags);
if (!newscan) {
IR_dprintk(1, "Failed to kmalloc %u bytes\n", newalloc);
return -ENOMEM;
@ -72,26 +114,78 @@ static int ir_resize_table(struct ir_scancode_table *rc_tab)
}
/**
* ir_do_setkeycode() - internal function to set a keycode in the
* scancode->keycode table
* ir_update_mapping() - set a keycode in the scancode->keycode table
* @dev: the struct input_dev device descriptor
* @rc_tab: the struct ir_scancode_table to set the keycode in
* @scancode: the scancode for the ir command
* @keycode: the keycode for the ir command
* @resize: whether the keytable may be shrunk
* @return: -EINVAL if the keycode could not be inserted, otherwise zero.
* @rc_tab: scancode table to be adjusted
* @index: index of the mapping that needs to be updated
* @keycode: the desired keycode
* @return: previous keycode assigned to the mapping
*
* This routine is used internally to manipulate the scancode->keycode table.
* The caller has to hold @rc_tab->lock.
* This routine is used to update scancode->keycopde mapping at given
* position.
*/
static int ir_do_setkeycode(struct input_dev *dev,
struct ir_scancode_table *rc_tab,
unsigned scancode, unsigned keycode,
bool resize)
static unsigned int ir_update_mapping(struct input_dev *dev,
struct ir_scancode_table *rc_tab,
unsigned int index,
unsigned int new_keycode)
{
int old_keycode = rc_tab->scan[index].keycode;
int i;
/* Did the user wish to remove the mapping? */
if (new_keycode == KEY_RESERVED || new_keycode == KEY_UNKNOWN) {
IR_dprintk(1, "#%d: Deleting scan 0x%04x\n",
index, rc_tab->scan[index].scancode);
rc_tab->len--;
memmove(&rc_tab->scan[index], &rc_tab->scan[index+ 1],
(rc_tab->len - index) * sizeof(struct ir_scancode));
} else {
IR_dprintk(1, "#%d: %s scan 0x%04x with key 0x%04x\n",
index,
old_keycode == KEY_RESERVED ? "New" : "Replacing",
rc_tab->scan[index].scancode, new_keycode);
rc_tab->scan[index].keycode = new_keycode;
__set_bit(new_keycode, dev->keybit);
}
if (old_keycode != KEY_RESERVED) {
/* A previous mapping was updated... */
__clear_bit(old_keycode, dev->keybit);
/* ... but another scancode might use the same keycode */
for (i = 0; i < rc_tab->len; i++) {
if (rc_tab->scan[i].keycode == old_keycode) {
__set_bit(old_keycode, dev->keybit);
break;
}
}
/* Possibly shrink the keytable, failure is not a problem */
ir_resize_table(rc_tab, GFP_ATOMIC);
}
return old_keycode;
}
/**
* ir_locate_scancode() - set a keycode in the scancode->keycode table
* @ir_dev: the struct ir_input_dev device descriptor
* @rc_tab: scancode table to be searched
* @scancode: the desired scancode
* @resize: controls whether we allowed to resize the table to
* accomodate not yet present scancodes
* @return: index of the mapping containing scancode in question
* or -1U in case of failure.
*
* This routine is used to locate given scancode in ir_scancode_table.
* If scancode is not yet present the routine will allocate a new slot
* for it.
*/
static unsigned int ir_establish_scancode(struct ir_input_dev *ir_dev,
struct ir_scancode_table *rc_tab,
unsigned int scancode,
bool resize)
{
unsigned int i;
int old_keycode = KEY_RESERVED;
struct ir_input_dev *ir_dev = input_get_drvdata(dev);
/*
* Unfortunately, some hardware-based IR decoders don't provide
@ -100,65 +194,34 @@ static int ir_do_setkeycode(struct input_dev *dev,
* the provided IR with another one, it is needed to allow loading
* IR tables from other remotes. So,
*/
if (ir_dev->props && ir_dev->props->scanmask) {
if (ir_dev->props && ir_dev->props->scanmask)
scancode &= ir_dev->props->scanmask;
}
/* First check if we already have a mapping for this ir command */
for (i = 0; i < rc_tab->len; i++) {
if (rc_tab->scan[i].scancode == scancode)
return i;
/* Keytable is sorted from lowest to highest scancode */
if (rc_tab->scan[i].scancode > scancode)
if (rc_tab->scan[i].scancode >= scancode)
break;
else if (rc_tab->scan[i].scancode < scancode)
continue;
old_keycode = rc_tab->scan[i].keycode;
rc_tab->scan[i].keycode = keycode;
/* Did the user wish to remove the mapping? */
if (keycode == KEY_RESERVED || keycode == KEY_UNKNOWN) {
IR_dprintk(1, "#%d: Deleting scan 0x%04x\n",
i, scancode);
rc_tab->len--;
memmove(&rc_tab->scan[i], &rc_tab->scan[i + 1],
(rc_tab->len - i) * sizeof(struct ir_scancode));
}
/* Possibly shrink the keytable, failure is not a problem */
ir_resize_table(rc_tab);
break;
}
if (old_keycode == KEY_RESERVED && keycode != KEY_RESERVED) {
/* No previous mapping found, we might need to grow the table */
if (resize && ir_resize_table(rc_tab))
return -ENOMEM;
/* No previous mapping found, we might need to grow the table */
if (rc_tab->size == rc_tab->len) {
if (!resize || ir_resize_table(rc_tab, GFP_ATOMIC))
return -1U;
}
IR_dprintk(1, "#%d: New scan 0x%04x with key 0x%04x\n",
i, scancode, keycode);
/* i is the proper index to insert our new keycode */
/* i is the proper index to insert our new keycode */
if (i < rc_tab->len)
memmove(&rc_tab->scan[i + 1], &rc_tab->scan[i],
(rc_tab->len - i) * sizeof(struct ir_scancode));
rc_tab->scan[i].scancode = scancode;
rc_tab->scan[i].keycode = keycode;
rc_tab->len++;
set_bit(keycode, dev->keybit);
} else {
IR_dprintk(1, "#%d: Replacing scan 0x%04x with key 0x%04x\n",
i, scancode, keycode);
/* A previous mapping was updated... */
clear_bit(old_keycode, dev->keybit);
/* ...but another scancode might use the same keycode */
for (i = 0; i < rc_tab->len; i++) {
if (rc_tab->scan[i].keycode == old_keycode) {
set_bit(old_keycode, dev->keybit);
break;
}
}
}
rc_tab->scan[i].scancode = scancode;
rc_tab->scan[i].keycode = KEY_RESERVED;
rc_tab->len++;
return 0;
return i;
}
/**
@ -171,17 +234,41 @@ static int ir_do_setkeycode(struct input_dev *dev,
* This routine is used to handle evdev EVIOCSKEY ioctl.
*/
static int ir_setkeycode(struct input_dev *dev,
unsigned int scancode, unsigned int keycode)
const struct input_keymap_entry *ke,
unsigned int *old_keycode)
{
int rc;
unsigned long flags;
struct ir_input_dev *ir_dev = input_get_drvdata(dev);
struct ir_scancode_table *rc_tab = &ir_dev->rc_tab;
unsigned int index;
unsigned int scancode;
int retval;
unsigned long flags;
spin_lock_irqsave(&rc_tab->lock, flags);
rc = ir_do_setkeycode(dev, rc_tab, scancode, keycode, true);
if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
index = ke->index;
if (index >= rc_tab->len) {
retval = -EINVAL;
goto out;
}
} else {
retval = input_scancode_to_scalar(ke, &scancode);
if (retval)
goto out;
index = ir_establish_scancode(ir_dev, rc_tab, scancode, true);
if (index >= rc_tab->len) {
retval = -ENOMEM;
goto out;
}
}
*old_keycode = ir_update_mapping(dev, rc_tab, index, ke->keycode);
out:
spin_unlock_irqrestore(&rc_tab->lock, flags);
return rc;
return retval;
}
/**
@ -189,31 +276,72 @@ static int ir_setkeycode(struct input_dev *dev,
* @dev: the struct input_dev device descriptor
* @to: the struct ir_scancode_table to copy entries to
* @from: the struct ir_scancode_table to copy entries from
* @return: -EINVAL if all keycodes could not be inserted, otherwise zero.
* @return: -ENOMEM if all keycodes could not be inserted, otherwise zero.
*
* This routine is used to handle table initialization.
*/
static int ir_setkeytable(struct input_dev *dev,
struct ir_scancode_table *to,
static int ir_setkeytable(struct ir_input_dev *ir_dev,
const struct ir_scancode_table *from)
{
struct ir_input_dev *ir_dev = input_get_drvdata(dev);
struct ir_scancode_table *rc_tab = &ir_dev->rc_tab;
unsigned long flags;
unsigned int i;
int rc = 0;
unsigned int i, index;
int rc;
rc = ir_create_table(&ir_dev->rc_tab,
from->name, from->ir_type, from->size);
if (rc)
return rc;
IR_dprintk(1, "Allocated space for %u keycode entries (%u bytes)\n",
rc_tab->size, rc_tab->alloc);
spin_lock_irqsave(&rc_tab->lock, flags);
for (i = 0; i < from->size; i++) {
rc = ir_do_setkeycode(dev, to, from->scan[i].scancode,
from->scan[i].keycode, false);
if (rc)
index = ir_establish_scancode(ir_dev, rc_tab,
from->scan[i].scancode, false);
if (index >= rc_tab->len) {
rc = -ENOMEM;
break;
}
ir_update_mapping(ir_dev->input_dev, rc_tab, index,
from->scan[i].keycode);
}
spin_unlock_irqrestore(&rc_tab->lock, flags);
if (rc)
ir_free_table(rc_tab);
return rc;
}
/**
* ir_lookup_by_scancode() - locate mapping by scancode
* @rc_tab: the &struct ir_scancode_table to search
* @scancode: scancode to look for in the table
* @return: index in the table, -1U if not found
*
* This routine performs binary search in RC keykeymap table for
* given scancode.
*/
static unsigned int ir_lookup_by_scancode(const struct ir_scancode_table *rc_tab,
unsigned int scancode)
{
unsigned int start = 0;
unsigned int end = rc_tab->len - 1;
unsigned int mid;
while (start <= end) {
mid = (start + end) / 2;
if (rc_tab->scan[mid].scancode < scancode)
start = mid + 1;
else if (rc_tab->scan[mid].scancode > scancode)
end = mid - 1;
else
return mid;
}
return -1U;
}
/**
* ir_getkeycode() - get a keycode from the scancode->keycode table
* @dev: the struct input_dev device descriptor
@ -224,36 +352,46 @@ static int ir_setkeytable(struct input_dev *dev,
* This routine is used to handle evdev EVIOCGKEY ioctl.
*/
static int ir_getkeycode(struct input_dev *dev,
unsigned int scancode, unsigned int *keycode)
struct input_keymap_entry *ke)
{
int start, end, mid;
unsigned long flags;
int key = KEY_RESERVED;
struct ir_input_dev *ir_dev = input_get_drvdata(dev);
struct ir_scancode_table *rc_tab = &ir_dev->rc_tab;
struct ir_scancode *entry;
unsigned long flags;
unsigned int index;
unsigned int scancode;
int retval;
spin_lock_irqsave(&rc_tab->lock, flags);
start = 0;
end = rc_tab->len - 1;
while (start <= end) {
mid = (start + end) / 2;
if (rc_tab->scan[mid].scancode < scancode)
start = mid + 1;
else if (rc_tab->scan[mid].scancode > scancode)
end = mid - 1;
else {
key = rc_tab->scan[mid].keycode;
break;
}
if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
index = ke->index;
} else {
retval = input_scancode_to_scalar(ke, &scancode);
if (retval)
goto out;
index = ir_lookup_by_scancode(rc_tab, scancode);
}
if (index >= rc_tab->len) {
if (!(ke->flags & INPUT_KEYMAP_BY_INDEX))
IR_dprintk(1, "unknown key for scancode 0x%04x\n",
scancode);
retval = -EINVAL;
goto out;
}
entry = &rc_tab->scan[index];
ke->index = index;
ke->keycode = entry->keycode;
ke->len = sizeof(entry->scancode);
memcpy(ke->scancode, &entry->scancode, sizeof(entry->scancode));
out:
spin_unlock_irqrestore(&rc_tab->lock, flags);
if (key == KEY_RESERVED)
IR_dprintk(1, "unknown key for scancode 0x%04x\n",
scancode);
*keycode = key;
return 0;
return retval;
}
/**
@ -268,12 +406,24 @@ static int ir_getkeycode(struct input_dev *dev,
*/
u32 ir_g_keycode_from_table(struct input_dev *dev, u32 scancode)
{
int keycode;
struct ir_input_dev *ir_dev = input_get_drvdata(dev);
struct ir_scancode_table *rc_tab = &ir_dev->rc_tab;
unsigned int keycode;
unsigned int index;
unsigned long flags;
spin_lock_irqsave(&rc_tab->lock, flags);
index = ir_lookup_by_scancode(rc_tab, scancode);
keycode = index < rc_tab->len ?
rc_tab->scan[index].keycode : KEY_RESERVED;
spin_unlock_irqrestore(&rc_tab->lock, flags);
ir_getkeycode(dev, scancode, &keycode);
if (keycode != KEY_RESERVED)
IR_dprintk(1, "%s: scancode 0x%04x keycode 0x%02x\n",
dev->name, scancode, keycode);
return keycode;
}
EXPORT_SYMBOL_GPL(ir_g_keycode_from_table);
@ -453,8 +603,8 @@ int __ir_input_register(struct input_dev *input_dev,
goto out_dev;
}
input_dev->getkeycode = ir_getkeycode;
input_dev->setkeycode = ir_setkeycode;
input_dev->getkeycode_new = ir_getkeycode;
input_dev->setkeycode_new = ir_setkeycode;
input_set_drvdata(input_dev, ir_dev);
ir_dev->input_dev = input_dev;
@ -462,12 +612,6 @@ int __ir_input_register(struct input_dev *input_dev,
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 *
sizeof(struct ir_scancode));
ir_dev->rc_tab.scan = kmalloc(ir_dev->rc_tab.alloc, GFP_KERNEL);
ir_dev->rc_tab.size = ir_dev->rc_tab.alloc / sizeof(struct ir_scancode);
if (props) {
ir_dev->props = props;
if (props->open)
@ -476,23 +620,14 @@ int __ir_input_register(struct input_dev *input_dev,
input_dev->close = ir_close;
}
if (!ir_dev->rc_tab.scan) {
rc = -ENOMEM;
goto out_name;
}
IR_dprintk(1, "Allocated space for %u keycode entries (%u bytes)\n",
ir_dev->rc_tab.size, ir_dev->rc_tab.alloc);
set_bit(EV_KEY, input_dev->evbit);
set_bit(EV_REP, input_dev->evbit);
set_bit(EV_MSC, input_dev->evbit);
set_bit(MSC_SCAN, input_dev->mscbit);
if (ir_setkeytable(input_dev, &ir_dev->rc_tab, rc_tab)) {
rc = -ENOMEM;
goto out_table;
}
rc = ir_setkeytable(ir_dev, rc_tab);
if (rc)
goto out_name;
rc = ir_register_class(input_dev);
if (rc < 0)
@ -515,7 +650,7 @@ int __ir_input_register(struct input_dev *input_dev,
out_event:
ir_unregister_class(input_dev);
out_table:
kfree(ir_dev->rc_tab.scan);
ir_free_table(&ir_dev->rc_tab);
out_name:
kfree(ir_dev->driver_name);
out_dev:
@ -533,7 +668,6 @@ EXPORT_SYMBOL_GPL(__ir_input_register);
void ir_input_unregister(struct input_dev *input_dev)
{
struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
struct ir_scancode_table *rc_tab;
if (!ir_dev)
return;
@ -545,10 +679,7 @@ void ir_input_unregister(struct input_dev *input_dev)
if (ir_dev->props->driver_type == RC_DRIVER_IR_RAW)
ir_raw_event_unregister(input_dev);
rc_tab = &ir_dev->rc_tab;
rc_tab->size = 0;
kfree(rc_tab->scan);
rc_tab->scan = NULL;
ir_free_table(&ir_dev->rc_tab);
ir_unregister_class(input_dev);

2
include/media/rc-map.h
View File

@ -35,7 +35,7 @@ struct ir_scancode_table {
unsigned int len; /* Used number of entries */
unsigned int alloc; /* Size of *scan in bytes */
u64 ir_type;
char *name;
const char *name;
spinlock_t lock;
};