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authorMauro Carvalho Chehab <mchehab@redhat.com>2009-11-29 11:08:02 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-12-05 18:42:21 -0200
commitf6fc50494027e913ff0159e43c593cd75f35ec7a (patch)
treee9337bfa7c65fb9d35db726003b84907c9b9ac61
parent055cd55601f948675006ca90362fc2bfaae90a86 (diff)
V4L/DVB (13538): ir-common: Use a dynamic keycode table
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
-rw-r--r--drivers/media/common/ir-functions.c19
-rw-r--r--drivers/media/common/ir-keytable.c75
-rw-r--r--include/media/ir-common.h6
3 files changed, 92 insertions, 8 deletions
diff --git a/drivers/media/common/ir-functions.c b/drivers/media/common/ir-functions.c
index b31bd27da37..e616f624cea 100644
--- a/drivers/media/common/ir-functions.c
+++ b/drivers/media/common/ir-functions.c
@@ -59,12 +59,20 @@ int ir_input_init(struct input_dev *dev, struct ir_input_state *ir,
{
ir->ir_type = ir_type;
- /* FIXME: Add the proper code to dynamically allocate IR table */
+ ir->keytable.size = ir_roundup_tablesize(ir_codes->size);
+ ir->keytable.scan = kzalloc(ir->keytable.size *
+ sizeof(struct ir_scancode), GFP_KERNEL);
+ if (!ir->keytable.scan)
+ return -ENOMEM;
- ir_set_keycode_table(dev, ir_codes);
+ IR_dprintk(1, "Allocated space for %d keycode entries (%zd bytes)\n",
+ ir->keytable.size,
+ ir->keytable.size * sizeof(ir->keytable.scan));
- clear_bit(0, dev->keybit);
+ ir_copy_table(&ir->keytable, ir_codes);
+ ir_set_keycode_table(dev, &ir->keytable);
+ clear_bit(0, dev->keybit);
set_bit(EV_KEY, dev->evbit);
if (repeat)
set_bit(EV_REP, dev->evbit);
@@ -73,11 +81,6 @@ int ir_input_init(struct input_dev *dev, struct ir_input_state *ir,
}
EXPORT_SYMBOL_GPL(ir_input_init);
-void ir_input_free(struct input_dev *input_dev)
-{
- /* FIXME: Add the proper code to free allocated resources */
-}
-EXPORT_SYMBOL_GPL(ir_input_free);
void ir_input_nokey(struct input_dev *dev, struct ir_input_state *ir)
{
diff --git a/drivers/media/common/ir-keytable.c b/drivers/media/common/ir-keytable.c
index 65e352389b2..6e3cc78c33b 100644
--- a/drivers/media/common/ir-keytable.c
+++ b/drivers/media/common/ir-keytable.c
@@ -7,6 +7,68 @@
#include <media/ir-common.h>
+#define IR_TAB_MIN_SIZE 32
+
+/**
+ * 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) {
+ 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", j);
+
+ return 0;
+}
+
+
/**
* ir_getkeycode() - get a keycode at the evdev scancode ->keycode table
* @dev: the struct input_dev device descriptor
@@ -152,3 +214,16 @@ int ir_set_keycode_table(struct input_dev *input_dev,
return 0;
}
+
+void ir_input_free(struct input_dev *dev)
+{
+ struct ir_scancode_table *rc_tab = input_get_drvdata(dev);
+
+ 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);
+
diff --git a/include/media/ir-common.h b/include/media/ir-common.h
index 16b8f17bcfe..72df0467d2b 100644
--- a/include/media/ir-common.h
+++ b/include/media/ir-common.h
@@ -54,6 +54,8 @@ struct ir_input_state {
/* configuration */
int ir_type;
+ struct ir_scancode_table keytable;
+
/* key info */
u32 ir_key; /* ir scancode */
u32 keycode; /* linux key code */
@@ -121,6 +123,10 @@ u32 ir_g_keycode_from_table(struct input_dev *input_dev,
int ir_set_keycode_table(struct input_dev *input_dev,
struct ir_scancode_table *rc_tab);
+
+int ir_roundup_tablesize(int n_elems);
+int ir_copy_table(struct ir_scancode_table *destin,
+ const struct ir_scancode_table *origin);
void ir_input_free(struct input_dev *input_dev);
/* scancode->keycode map tables from ir-keymaps.c */