V4L/DVB (13532): ir-common: Add infrastructure to use a dynamic keycode table
V4L drivers use an static keycode vector with 128 entries, where the scancode
indexes the keycode. While this works, it limits the scancodes to have only
7 bits, not allowing for example full RC5 codes.
Instead of implementing the same code on every V4L driver, provide a common
infrastructure to handle the bigger tables, minimizing the changes inside
each driver.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/common/ir-keytable.c b/drivers/media/common/ir-keytable.c
new file mode 100644
index 0000000..2de7cae
--- /dev/null
+++ b/drivers/media/common/ir-keytable.c
@@ -0,0 +1,156 @@
+/* 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>
+
+/**
+ * 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 i;
+ struct ir_scancode_table *rc_tab = input_get_drvdata(dev);
+ struct ir_scancode *keymap = rc_tab->scan;
+
+ /* See if we can match the raw key code. */
+ for (i = 0; i < rc_tab->size; i++)
+ if (keymap[i].scancode == scancode) {
+ *keycode = keymap[i].keycode;
+ return 0;
+ }
+
+ /*
+ * If is there extra space, returns KEY_RESERVED,
+ * otherwise, input core won't let ir_setkeycode
+ * to work
+ */
+ for (i = 0; i < rc_tab->size; i++)
+ if (keymap[i].keycode == KEY_RESERVED ||
+ keymap[i].keycode == KEY_UNKNOWN) {
+ *keycode = KEY_RESERVED;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+/**
+ * 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 i;
+ struct ir_scancode_table *rc_tab = input_get_drvdata(dev);
+ struct ir_scancode *keymap = rc_tab->scan;
+
+ /* Search if it is replacing an existing keycode */
+ for (i = 0; i < rc_tab->size; i++)
+ if (keymap[i].scancode == scancode) {
+ keymap[i].keycode = keycode;
+ return 0;
+ }
+
+ /* Search if is there a clean entry. If so, use it */
+ for (i = 0; i < rc_tab->size; i++)
+ if (keymap[i].keycode == KEY_RESERVED ||
+ keymap[i].keycode == KEY_UNKNOWN) {
+ keymap[i].scancode = scancode;
+ keymap[i].keycode = keycode;
+ return 0;
+ }
+
+ /*
+ * FIXME: Currently, it is not possible to increase the size of
+ * scancode table. For it to happen, one possibility
+ * would be to allocate a table with key_map_size + 1,
+ * copying data, appending the new key on it, and freeing
+ * the old one - or maybe just allocating some spare space
+ */
+
+ return -EINVAL;
+}
+
+/**
+ * ir_g_keycode_from_table() - gets the keycode that corresponds to a scancode
+ * @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.
+ */
+u32 ir_g_keycode_from_table(struct input_dev *dev, u32 scancode)
+{
+ int i;
+ struct ir_scancode_table *rc_tab = input_get_drvdata(dev);
+ struct ir_scancode *keymap = rc_tab->scan;
+
+ for (i = 0; i < rc_tab->size; i++)
+ if (keymap[i].scancode == scancode) {
+ IR_dprintk(1, "%s: scancode 0x%04x keycode 0x%02x\n",
+ dev->name, scancode, keymap[i].keycode);
+
+ return keymap[i].keycode;
+ }
+
+ printk(KERN_INFO "%s: unknown key for scancode 0x%04x\n",
+ dev->name, scancode);
+
+ return KEY_UNKNOWN;
+}
+EXPORT_SYMBOL_GPL(ir_g_keycode_from_table);
+
+/**
+ * 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 requires that the caller initializes the input_dev struct with
+ * some fields: name,
+ */
+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;
+
+ 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;
+}
+EXPORT_SYMBOL_GPL(ir_set_keycode_table);