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Subject[PATCH] platform/x86: thinkpad_acpi: add adaptive_kbd_modes parameter
This bitmap parameter allows the user to add/remove modes for
DFR_CHANGE_ROW to cycle through.

Users who wish to cycle through WEB_BROWSER_MODE and/or
WEB_CONFERENCE_MODE may now do so by enabling corresponding bits.

While some appreciate more modes, I made this feature because I
wanted to lock the keyboard into FUNCTION_MODE. This is because
my Fn key (DFR_CHANGE_ROW) is mapped to Escape, and my "Esc" key
is mapped to grave/asciitilde to match the layout of a regular
keyboard.

The default remains unchanged with the DFR_CHANGE_ROW key
toggling between HOME_MODE and FUNCTION_MODE. Thus the
default "adaptive_kbd_modes" value is 9, but I use 8:

echo 8 >/sys/devices/platform/thinkpad_acpi/adaptive_kbd_modes

The above setting with this change and the following keymap
preserves my sanity on the atrocious adaptive keyboard on
the 2nd-gen X1 Carbon:

{
echo keymaps 0-255
# Esc key maps to '`' or '~'
echo keycode 1 = grave asciitilde

# Fn key maps to Escape
echo keycode 143 = Escape

# Home and End on the keyboard map to Control
echo keycode 102 = Control
echo keycode 107 = Control
} | loadkeys -

Or with the following xmodmaprc:

remove Control = Control_L
remove Lock = Control_L
keycode 9 = grave asciitilde grave
keycode 110 = Control_L NoSymbol Control_L
keycode 115 = Control_L NoSymbol Control_L
keycode 151 = Escape NoSymbol Escape
add Control = Control_L

Signed-off-by: Eric Wong <e@80x24.org>
---
Documentation/laptops/thinkpad-acpi.txt | 11 +++++
drivers/platform/x86/thinkpad_acpi.c | 79 ++++++++++++++++++++++-----------
2 files changed, 64 insertions(+), 26 deletions(-)

diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index 6cced88de6da..36c8731b6919 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -1378,6 +1378,17 @@ For more details about which buttons will appear depending on the mode, please
review the laptop's user guide:
http://www.lenovo.com/shop/americas/content/user_guides/x1carbon_2_ug_en.pdf

+sysfs device attribute: adaptive_kbd_modes
+
+This bitmap attribute controls the modes the "Fn" key is allowed
+to cycle through. The value can be read and set. Enabled bits
+correspond to the modes above (that is, the first bit is "Home mode"
+and the fourth bit "Function mode").
+
+The default value is 9, which allows cycling between Home and Function modes.
+Setting and unsetting corresponding bits allows adding or removing modes
+to cycle through.
+
Multiple Commands, Module Parameters
------------------------------------

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index fde08a997557..77b4f00e0443 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -3094,8 +3094,44 @@ static ssize_t adaptive_kbd_mode_store(struct device *dev,

static DEVICE_ATTR_RW(adaptive_kbd_mode);

+/* Thinkpad X1 Carbon support 5 modes including Home mode, Web browser
+ * mode, Web conference mode, Function mode and Lay-flat mode.
+ * We support cycling between Home mode and Function mode by default.
+ *
+ * Users may enable and disable other modes by changing the
+ * adaptive_kbd_modes bitmap attribute
+ */
+static unsigned adaptive_kbd_modes =
+ 1 << HOME_MODE |
+/* 1 << WEB_BROWSER_MODE |
+ 1 << WEB_CONFERENCE_MODE | */
+ 1 << FUNCTION_MODE;
+
+static ssize_t adaptive_kbd_modes_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%u\n", adaptive_kbd_modes);
+}
+
+static ssize_t adaptive_kbd_modes_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long t;
+
+ if (parse_strtoul(buf, (1 << LAYFLAT_MODE) - 1, &t))
+ return -EINVAL;
+
+ adaptive_kbd_modes = (unsigned int)t;
+ return count;
+}
+
+static DEVICE_ATTR_RW(adaptive_kbd_modes);
+
static struct attribute *adaptive_kbd_attributes[] = {
&dev_attr_adaptive_kbd_mode.attr,
+ &dev_attr_adaptive_kbd_modes.attr,
NULL
};

@@ -3763,20 +3799,7 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
return (res < 0) ? res : 1;
}

-/* Thinkpad X1 Carbon support 5 modes including Home mode, Web browser
- * mode, Web conference mode, Function mode and Lay-flat mode.
- * We support Home mode and Function mode currently.
- *
- * Will consider support rest of modes in future.
- *
- */
-static const int adaptive_keyboard_modes[] = {
- HOME_MODE,
-/* WEB_BROWSER_MODE = 2,
- WEB_CONFERENCE_MODE = 3, */
- FUNCTION_MODE
-};
-
+/* Thinkpad X1 Carbon adaptive keyboard */
#define DFR_CHANGE_ROW 0x101
#define DFR_SHOW_QUICKVIEW_ROW 0x102
#define FIRST_ADAPTIVE_KEY 0x103
@@ -3815,20 +3838,20 @@ static int adaptive_keyboard_set_mode(int new_mode)

static int adaptive_keyboard_get_next_mode(int mode)
{
- size_t i;
- size_t max_mode = ARRAY_SIZE(adaptive_keyboard_modes) - 1;
-
- for (i = 0; i <= max_mode; i++) {
- if (adaptive_keyboard_modes[i] == mode)
- break;
- }
+ int max_mode = fls(adaptive_kbd_modes);
+ int new_mode = mode >= max_mode ? HOME_MODE : mode + 1;

- if (i >= max_mode)
- i = 0;
- else
- i++;
+ /* make sure the new mode is allowed by the user */
+ while (!(adaptive_kbd_modes & (1 << new_mode))) {
+ new_mode++;
+ if (new_mode > max_mode)
+ new_mode = HOME_MODE;

- return adaptive_keyboard_modes[i];
+ /* maybe the user disabled all other modes: */
+ if (new_mode == mode)
+ return mode;
+ }
+ return new_mode;
}

static bool adaptive_keyboard_hotkey_notify_hotkey(unsigned int scancode)
@@ -3848,6 +3871,10 @@ static bool adaptive_keyboard_hotkey_notify_hotkey(unsigned int scancode)
return false;
new_mode = adaptive_keyboard_get_next_mode(
current_mode);
+
+ /* some users may not want cycling */
+ if (new_mode == current_mode)
+ return true;
}

if (adaptive_keyboard_set_mode(new_mode) < 0)
--
EW
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