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authorRajat Jain <rajatja@google.com>2020-04-27 17:53:46 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2020-04-27 18:04:24 -0700
commit9d17ad2369dcc9beda0785cf5960222dbdd6c9df (patch)
tree3bb037fdb9ba2c1b826124e9e8acb1ab3442076a /drivers/input
parent8f7b057abe283a4505747ea8275751479442de53 (diff)
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>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/keyboard/atkbd.c41
1 files changed, 40 insertions, 1 deletions
diff --git a/drivers/input/keyboard/atkbd.c b/drivers/input/keyboard/atkbd.c
index 358e91f8888f..6ec28265771d 100644
--- a/drivers/input/keyboard/atkbd.c
+++ b/drivers/input/keyboard/atkbd.c
@@ -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];