Newer thinkpad models have a mute hotkey with a led to indicate
current mute states. Thinkpad BIOS provides ACPI interfaces for
getting and changing the hardware mute along with the led.
Signed-off-by: Alex Hung <alex.hung@xxxxxxxxxxxxx>
---
drivers/platform/x86/thinkpad_acpi.c | 50 ++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 54d31c0..3b648c0 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -2929,6 +2929,55 @@ static void hotkey_wakeup_hotunplug_complete_notify_change(void)
"wakeup_hotunplug_complete");
}
+/* sysfs hotkey_mute_state --------------------------------------------- */
+enum {
+ TPACPI_AML_MUTE_READ_MASK = 0x01,
+ TPACPI_AML_MUTE_ERROR_STATE_MASK = 0x80000000,
+};
+
+static ssize_t hotkey_mute_state_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int state;
+
+ if (!acpi_evalf(hkey_handle, &state, "GSMS", "dd"))
+ return -EIO;
+
+ if (state & TPACPI_AML_MUTE_ERROR_STATE_MASK)
+ pr_warn("getting mute state failed.\n");
+
+ state &= TPACPI_AML_MUTE_READ_MASK;
+
+ return snprintf(buf, PAGE_SIZE, "%x\n", state);
+}
+
+static ssize_t hotkey_mute_state_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, "SSMS", "dd", state))
+ return -EIO;
+
+ if (output & TPACPI_AML_MUTE_ERROR_STATE_MASK)
+ return -EIO;
+
+ return count;
+}
+
+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);
+
/* --------------------------------------------------------------------- */
static struct attribute *hotkey_attributes[] __initdata = {
@@ -2945,6 +2994,7 @@ static struct attribute *hotkey_attributes[] __initdata = {
&dev_attr_hotkey_source_mask.attr,
&dev_attr_hotkey_poll_freq.attr,
#endif
+ &dev_attr_hotkey_mute_state.attr,
};
/*
--
1.8.1.2
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