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Input: atkbd - receive and use physcode->keycode mapping from FW 

Allow the firmware to specify the mapping between the scan code and the
linux keycode. This takes the form of a "linux,keymap" property which is
an array of u32 values, each value specifying mapping for a key.

Signed-off-by: Rajat Jain <rajatja@google.com>
Link: https://lore.kernel.org/r/20200427210259.91330-3-rajatja@google.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Rajat Jain 2020-04-27 17:53:46 -07:00 committed by Dmitry Torokhov
parent 8f7b057abe
commit 9d17ad2369
1 changed files with 40 additions and 1 deletions
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41
drivers/input/keyboard/atkbd.c
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@ -66,6 +66,9 @@ MODULE_PARM_DESC(terminal, "Enable break codes on an IBM Terminal keyboard conne
#define MAX_FUNCTION_ROW_KEYS 24
#define SCANCODE(keymap) ((keymap >> 16) & 0xFFFF)
#define KEYCODE(keymap) (keymap & 0xFFFF)
/*
* Scancode to keycode tables. These are just the default setting, and
* are loadable via a userland utility.
@ -1032,6 +1035,39 @@ static unsigned int atkbd_oqo_01plus_scancode_fixup(struct atkbd *atkbd,
return code;
}
static int atkbd_get_keymap_from_fwnode(struct atkbd *atkbd)
{
struct device *dev = &atkbd->ps2dev.serio->dev;
int i, n;
u32 *ptr;
u16 scancode, keycode;
/* Parse "linux,keymap" property */
n = device_property_count_u32(dev, "linux,keymap");
if (n <= 0 || n > ATKBD_KEYMAP_SIZE)
return -ENXIO;
ptr = kcalloc(n, sizeof(u32), GFP_KERNEL);
if (!ptr)
return -ENOMEM;
if (device_property_read_u32_array(dev, "linux,keymap", ptr, n)) {
dev_err(dev, "problem parsing FW keymap property\n");
kfree(ptr);
return -EINVAL;
}
memset(atkbd->keycode, 0, sizeof(atkbd->keycode));
for (i = 0; i < n; i++) {
scancode = SCANCODE(ptr[i]);
keycode = KEYCODE(ptr[i]);
atkbd->keycode[scancode] = keycode;
}
kfree(ptr);
return 0;
}
/*
* atkbd_set_keycode_table() initializes keyboard's keycode table
* according to the selected scancode set
@ -1039,13 +1075,16 @@ static unsigned int atkbd_oqo_01plus_scancode_fixup(struct atkbd *atkbd,
static void atkbd_set_keycode_table(struct atkbd *atkbd)
{
struct device *dev = &atkbd->ps2dev.serio->dev;
unsigned int scancode;
int i, j;
memset(atkbd->keycode, 0, sizeof(atkbd->keycode));
bitmap_zero(atkbd->force_release_mask, ATKBD_KEYMAP_SIZE);
if (atkbd->translated) {
if (!atkbd_get_keymap_from_fwnode(atkbd)) {
dev_dbg(dev, "Using FW keymap\n");
} else if (atkbd->translated) {
for (i = 0; i < 128; i++) {
scancode = atkbd_unxlate_table[i];
atkbd->keycode[i] = atkbd_set2_keycode[scancode];