Thinkpad BIOS provides an ACPI interface to disable hardware mute.
When enabled (as default), Thinkpad issues a scancode and toggles
hardware mute + led. Once disabled, Thinkpad will only issues the
scancode.
When hardware mute is enabled, hardware mute can be out-of-sync
with user-space if a user changes mute state by user application.
This patch gives a chance to disable hardware mute.
Signed-off-by: Alex Hung <alex.hung@xxxxxxxxxxxxx>
---
drivers/platform/x86/thinkpad_acpi.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 3b648c0..a901fac 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -2978,6 +2978,32 @@ static struct device_attribute dev_attr_hotkey_mute_state =
__ATTR(hotkey_mute_state, S_IWUSR | S_IRUGO,
hotkey_mute_state_show, hotkey_mute_state_store);
+/* sysfs hotkey_mute_enable -------------------------------------------- */
+static ssize_t hotkey_mute_enable_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long state;
+ int output;
+
+ if (parse_strtoul(buf, 25, &state))
+ return -EINVAL;
+
+ if (state != 1 && state != 0)
+ return -EINVAL;
+
+ if (!acpi_evalf(hkey_handle, &output, "SHDA", "dd", state))
+ return -EIO;
+
+ if (output & TPACPI_AML_MUTE_ERROR_STATE_MASK)
+ return -EIO;
+
+ return count;
+}
+
+static struct device_attribute dev_attr_hotkey_mute_enable =
+ __ATTR(hotkey_mute_enable, S_IWUSR, NULL, hotkey_mute_enable_store);
+
/* --------------------------------------------------------------------- */
static struct attribute *hotkey_attributes[] __initdata = {
@@ -2995,6 +3021,7 @@ static struct attribute *hotkey_attributes[] __initdata = {
&dev_attr_hotkey_poll_freq.attr,
#endif
&dev_attr_hotkey_mute_state.attr,
+ &dev_attr_hotkey_mute_enable.attr,
};
/*
--
1.8.1.2
--
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