diff options
Diffstat (limited to 'drivers/media/common/ir-keytable.c')
| -rw-r--r-- | drivers/media/common/ir-keytable.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/media/common/ir-keytable.c b/drivers/media/common/ir-keytable.c new file mode 100644 index 00000000000..2de7caeef43 --- /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); |