V4L/DVB (13612): IR: Move common IR code to drivers/media/IR

This is the first step of creating a common code for IR that can be
used by other input devices.

For now, keep IR dir at drivers/media, to easy the movement of the IR files,
but later patches may move it to drivers/IR or drivers/input/IR.

No functional changes is done on this patch.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 0 insertions, 432 deletions

diff --git a/drivers/media/common/ir-keytable.c b/drivers/media/common/ir-keytable.c
deleted file mode 100644
index ceef0e82fb4..00000000000
--- a/drivers/media/common/ir-keytable.c
+++ /dev/null
@@ -1,432 +0,0 @@
-/* ir-register.c - handle IR scancode->keycode tables
- *
- * Copyright (C) 2009 by Mauro Carvalho Chehab <mchehab@redhat.com>
- */
-
-#include <linux/usb/input.h>
-
-#include <media/ir-common.h>
-
-#define IR_TAB_MIN_SIZE	32
-#define IR_TAB_MAX_SIZE	1024
-
-/**
- * ir_seek_table() - returns the element order on the table
- * @rc_tab:	the ir_scancode_table with the keymap to be used
- * @scancode:	the scancode that we're seeking
- *
- * This routine is used by the input routines when a key is pressed at the
- * IR. The scancode is received and needs to be converted into a keycode.
- * If the key is not found, it returns KEY_UNKNOWN. Otherwise, returns the
- * corresponding keycode from the table.
- */
-static int ir_seek_table(struct ir_scancode_table *rc_tab, u32 scancode)
-{
-	int rc;
-	unsigned long flags;
-	struct ir_scancode *keymap = rc_tab->scan;
-
-	spin_lock_irqsave(&rc_tab->lock, flags);
-
-	/* FIXME: replace it by a binary search */
-
-	for (rc = 0; rc < rc_tab->size; rc++)
-		if (keymap[rc].scancode == scancode)
-			goto exit;
-
-	/* Not found */
-	rc = -EINVAL;
-
-exit:
-	spin_unlock_irqrestore(&rc_tab->lock, flags);
-	return rc;
-}
-
-/**
- * ir_roundup_tablesize() - gets an optimum value for the table size
- * @n_elems:		minimum number of entries to store keycodes
- *
- * This routine is used to choose the keycode table size.
- *
- * In order to have some empty space for new keycodes,
- * and knowing in advance that kmalloc allocates only power of two
- * segments, it optimizes the allocated space to have some spare space
- * for those new keycodes by using the maximum number of entries that
- * will be effectively be allocated by kmalloc.
- * In order to reduce the quantity of table resizes, it has a minimum
- * table size of IR_TAB_MIN_SIZE.
- */
-int ir_roundup_tablesize(int n_elems)
-{
-	size_t size;
-
-	if (n_elems < IR_TAB_MIN_SIZE)
-		n_elems = IR_TAB_MIN_SIZE;
-
-	/*
-	 * As kmalloc only allocates sizes of power of two, get as
-	 * much entries as possible for the allocated memory segment
-	 */
-	size = roundup_pow_of_two(n_elems * sizeof(struct ir_scancode));
-	n_elems = size / sizeof(struct ir_scancode);
-
-	return n_elems;
-}
-
-/**
- * ir_copy_table() - copies a keytable, discarding the unused entries
- * @destin:	destin table
- * @origin:	origin table
- *
- * Copies all entries where the keycode is not KEY_UNKNOWN/KEY_RESERVED
- */
-
-int ir_copy_table(struct ir_scancode_table *destin,
-		 const struct ir_scancode_table *origin)
-{
-	int i, j = 0;
-
-	for (i = 0; i < origin->size; i++) {
-		if (origin->scan[i].keycode == KEY_UNKNOWN ||
-		   origin->scan[i].keycode == KEY_RESERVED)
-			continue;
-
-		memcpy(&destin->scan[j], &origin->scan[i], sizeof(struct ir_scancode));
-		j++;
-	}
-	destin->size = j;
-
-	IR_dprintk(1, "Copied %d scancodes to the new keycode table\n", destin->size);
-
-	return 0;
-}
-
-/**
- * ir_getkeycode() - get a keycode at the evdev scancode ->keycode table
- * @dev:	the struct input_dev device descriptor
- * @scancode:	the desired scancode
- * @keycode:	the keycode to be retorned.
- *
- * This routine is used to handle evdev EVIOCGKEY ioctl.
- * If the key is not found, returns -EINVAL, otherwise, returns 0.
- */
-static int ir_getkeycode(struct input_dev *dev,
-			 int scancode, int *keycode)
-{
-	int elem;
-	struct ir_scancode_table *rc_tab = input_get_drvdata(dev);
-
-	elem = ir_seek_table(rc_tab, scancode);
-	if (elem >= 0) {
-		*keycode = rc_tab->scan[elem].keycode;
-		return 0;
-	}
-
-	/*
-	 * Scancode not found and table can't be expanded
-	 */
-	if (elem < 0 && rc_tab->size == IR_TAB_MAX_SIZE)
-		return -EINVAL;
-
-	/*
-	 * If is there extra space, returns KEY_RESERVED,
-	 * otherwise, input core won't let ir_setkeycode to work
-	 */
-	*keycode = KEY_RESERVED;
-	return 0;
-}
-
-
-/**
- * ir_is_resize_needed() - Check if the table needs rezise
- * @table:		keycode table that may need to resize
- * @n_elems:		minimum number of entries to store keycodes
- *
- * Considering that kmalloc uses power of two storage areas, this
- * routine detects if the real alloced size will change. If not, it
- * just returns without doing nothing. Otherwise, it will extend or
- * reduce the table size to meet the new needs.
- *
- * It returns 0 if no resize is needed, 1 otherwise.
- */
-static int ir_is_resize_needed(struct ir_scancode_table *table, int n_elems)
-{
-	int cur_size = ir_roundup_tablesize(table->size);
-	int new_size = ir_roundup_tablesize(n_elems);
-
-	if (cur_size == new_size)
-		return 0;
-
-	/* Resize is needed */
-	return 1;
-}
-
-/**
- * ir_delete_key() - remove a keycode from the table
- * @rc_tab:		keycode table
- * @elem:		element to be removed
- *
- */
-static void ir_delete_key(struct ir_scancode_table *rc_tab, int elem)
-{
-	unsigned long flags = 0;
-	int newsize = rc_tab->size - 1;
-	int resize = ir_is_resize_needed(rc_tab, newsize);
-	struct ir_scancode *oldkeymap = rc_tab->scan;
-	struct ir_scancode *newkeymap;
-
-	if (resize) {
-		newkeymap = kzalloc(ir_roundup_tablesize(newsize) *
-				    sizeof(*newkeymap), GFP_ATOMIC);
-
-		/* There's no memory for resize. Keep the old table */
-		if (!newkeymap)
-			resize = 0;
-	}
-
-	if (!resize) {
-		newkeymap = oldkeymap;
-
-		/* We'll modify the live table. Lock it */
-		spin_lock_irqsave(&rc_tab->lock, flags);
-	}
-
-	/*
-	 * Copy the elements before the one that will be deleted
-	 * if (!resize), both oldkeymap and newkeymap points
-	 * to the same place, so, there's no need to copy
-	 */
-	if (resize && elem > 0)
-		memcpy(newkeymap, oldkeymap,
-		       elem * sizeof(*newkeymap));
-
-	/*
-	 * Copy the other elements overwriting the element to be removed
-	 * This operation applies to both resize and non-resize case
-	 */
-	if (elem < newsize)
-		memcpy(&newkeymap[elem], &oldkeymap[elem + 1],
-		       (newsize - elem) * sizeof(*newkeymap));
-
-	if (resize) {
-		/*
-		 * As the copy happened to a temporary table, only here
-		 * it needs to lock while replacing the table pointers
-		 * to use the new table
-		 */
-		spin_lock_irqsave(&rc_tab->lock, flags);
-		rc_tab->size = newsize;
-		rc_tab->scan = newkeymap;
-		spin_unlock_irqrestore(&rc_tab->lock, flags);
-
-		/* Frees the old keytable */
-		kfree(oldkeymap);
-	} else {
-		rc_tab->size = newsize;
-		spin_unlock_irqrestore(&rc_tab->lock, flags);
-	}
-}
-
-/**
- * ir_insert_key() - insert a keycode at the table
- * @rc_tab:		keycode table
- * @scancode:	the desired scancode
- * @keycode:	the keycode to be retorned.
- *
- */
-static int ir_insert_key(struct ir_scancode_table *rc_tab,
-			  int scancode, int keycode)
-{
-	unsigned long flags;
-	int elem = rc_tab->size;
-	int newsize = rc_tab->size + 1;
-	int resize = ir_is_resize_needed(rc_tab, newsize);
-	struct ir_scancode *oldkeymap = rc_tab->scan;
-	struct ir_scancode *newkeymap;
-
-	if (resize) {
-		newkeymap = kzalloc(ir_roundup_tablesize(newsize) *
-				    sizeof(*newkeymap), GFP_ATOMIC);
-		if (!newkeymap)
-			return -ENOMEM;
-
-		memcpy(newkeymap, oldkeymap,
-		       rc_tab->size * sizeof(*newkeymap));
-	} else
-		newkeymap  = oldkeymap;
-
-	/* Stores the new code at the table */
-	IR_dprintk(1, "#%d: New scan 0x%04x with key 0x%04x\n",
-		   rc_tab->size, scancode, keycode);
-
-	spin_lock_irqsave(&rc_tab->lock, flags);
-	rc_tab->size = newsize;
-	if (resize) {
-		rc_tab->scan = newkeymap;
-		kfree(oldkeymap);
-	}
-	newkeymap[elem].scancode = scancode;
-	newkeymap[elem].keycode  = keycode;
-	spin_unlock_irqrestore(&rc_tab->lock, flags);
-
-	return 0;
-}
-
-/**
- * ir_setkeycode() - set a keycode at the evdev scancode ->keycode table
- * @dev:	the struct input_dev device descriptor
- * @scancode:	the desired scancode
- * @keycode:	the keycode to be retorned.
- *
- * This routine is used to handle evdev EVIOCSKEY ioctl.
- * There's one caveat here: how can we increase the size of the table?
- * If the key is not found, returns -EINVAL, otherwise, returns 0.
- */
-static int ir_setkeycode(struct input_dev *dev,
-			 int scancode, int keycode)
-{
-	int rc = 0;
-	struct ir_scancode_table *rc_tab = input_get_drvdata(dev);
-	struct ir_scancode *keymap = rc_tab->scan;
-	unsigned long flags;
-
-	/*
-	 * Handle keycode table deletions
-	 *
-	 * If userspace is adding a KEY_UNKNOWN or KEY_RESERVED,
-	 * deal as a trial to remove an existing scancode attribution
-	 * if table become too big, reduce it to save space
-	 */
-	if (keycode == KEY_UNKNOWN || keycode == KEY_RESERVED) {
-		rc = ir_seek_table(rc_tab, scancode);
-		if (rc < 0)
-			return 0;
-
-		IR_dprintk(1, "#%d: Deleting scan 0x%04x\n", rc, scancode);
-		clear_bit(keymap[rc].keycode, dev->keybit);
-		ir_delete_key(rc_tab, rc);
-
-		return 0;
-	}
-
-	/*
-	 * Handle keycode replacements
-	 *
-	 * If the scancode exists, just replace by the new value
-	 */
-	rc = ir_seek_table(rc_tab, scancode);
-	if (rc >= 0) {
-		IR_dprintk(1, "#%d: Replacing scan 0x%04x with key 0x%04x\n",
-			rc, scancode, keycode);
-
-		clear_bit(keymap[rc].keycode, dev->keybit);
-
-		spin_lock_irqsave(&rc_tab->lock, flags);
-		keymap[rc].keycode = keycode;
-		spin_unlock_irqrestore(&rc_tab->lock, flags);
-
-		set_bit(keycode, dev->keybit);
-
-		return 0;
-	}
-
-	/*
-	 * Handle new scancode inserts
-	 *
-	 * reallocate table if needed and insert a new keycode
-	 */
-
-	/* Avoid growing the table indefinitely */
-	if (rc_tab->size + 1 > IR_TAB_MAX_SIZE)
-		return -EINVAL;
-
-	rc = ir_insert_key(rc_tab, scancode, keycode);
-	if (rc < 0)
-		return rc;
-	set_bit(keycode, dev->keybit);
-
-	return 0;
-}
-
-/**
- * ir_g_keycode_from_table() - gets the keycode that corresponds to a scancode
- * @input_dev:	the struct input_dev descriptor of the device
- * @scancode:	the scancode that we're seeking
- *
- * This routine is used by the input routines when a key is pressed at the
- * IR. The scancode is received and needs to be converted into a keycode.
- * If the key is not found, it returns KEY_UNKNOWN. Otherwise, returns the
- * corresponding keycode from the table.
- */
-u32 ir_g_keycode_from_table(struct input_dev *dev, u32 scancode)
-{
-	struct ir_scancode_table *rc_tab = input_get_drvdata(dev);
-	struct ir_scancode *keymap = rc_tab->scan;
-	int elem;
-
-	elem = ir_seek_table(rc_tab, scancode);
-	if (elem >= 0) {
-		IR_dprintk(1, "%s: scancode 0x%04x keycode 0x%02x\n",
-			   dev->name, scancode, keymap[elem].keycode);
-
-		return rc_tab->scan[elem].keycode;
-	}
-
-	printk(KERN_INFO "%s: unknown key for scancode 0x%04x\n",
-	       dev->name, scancode);
-
-	/* Reports userspace that an unknown keycode were got */
-	return KEY_RESERVED;
-}
-
-/**
- * ir_set_keycode_table() - sets the IR keycode table and add the handlers
- *			    for keymap table get/set
- * @input_dev:	the struct input_dev descriptor of the device
- * @rc_tab:	the struct ir_scancode_table table of scancode/keymap
- *
- * This routine is used to initialize the input infrastructure to work with
- * an IR.
- * It should be called before registering the IR device.
- */
-int ir_set_keycode_table(struct input_dev *input_dev,
-			 struct ir_scancode_table *rc_tab)
-{
-	struct ir_scancode *keymap = rc_tab->scan;
-	int i;
-
-	spin_lock_init(&rc_tab->lock);
-
-	if (rc_tab->scan == NULL || !rc_tab->size)
-		return -EINVAL;
-
-	/* set the bits for the keys */
-	IR_dprintk(1, "key map size: %d\n", rc_tab->size);
-	for (i = 0; i < rc_tab->size; i++) {
-		IR_dprintk(1, "#%d: setting bit for keycode 0x%04x\n",
-			i, keymap[i].keycode);
-		set_bit(keymap[i].keycode, input_dev->keybit);
-	}
-
-	input_dev->getkeycode = ir_getkeycode;
-	input_dev->setkeycode = ir_setkeycode;
-	input_set_drvdata(input_dev, rc_tab);
-
-	return 0;
-}
-
-void ir_input_free(struct input_dev *dev)
-{
-	struct ir_scancode_table *rc_tab = input_get_drvdata(dev);
-
-	if (!rc_tab)
-		return;
-
-	IR_dprintk(1, "Freed keycode table\n");
-
-	rc_tab->size = 0;
-	kfree(rc_tab->scan);
-	rc_tab->scan = NULL;
-}
-EXPORT_SYMBOL_GPL(ir_input_free);
-