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 | 89 ++++++++++++++++++++++++++++++++++++
1 file changed, 89 insertions(+)
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index adb3a4e..d39bf18 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -8364,6 +8364,91 @@ static struct ibm_struct fan_driver_data = {
.resume = fan_resume,
};
+/*************************************************************************
+ * Mute LED subdriver
+ */
+
+enum {
+ TPACPI_AML_MUTE_READ_MASK = 0x01,
+};
+
+static int mute_led_on_off(int state)
+{
+ int output;
+ acpi_handle temp;
+
+ if (!ACPI_SUCCESS(acpi_get_handle(hkey_handle, "SSMS", &temp))) {
+ pr_warn("Thinkpad ACPI has no GSMS interface.\n");
+ return -EIO;
+ }
+
+ if (!acpi_evalf(hkey_handle, &output, "SSMS", "dd", state))
+ return -EIO;
+
+ return 0;
+}
+
+static void mute_led_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ if (value > 0)
+ mute_led_on_off(1);
+ else
+ mute_led_on_off(0);
+}
+
+static enum led_brightness mute_led_get(struct led_classdev *led_cdev)
+{
+ int state = 0;
+ acpi_handle temp;
+
+ if (!ACPI_SUCCESS(acpi_get_handle(hkey_handle, "GSMS", &temp))) {
+ pr_warn("Thinkpad ACPI has no GSMS interface.\n");
+ return -EIO;
+ }
+
+ if (!acpi_evalf(hkey_handle, &state, "GSMS", "dd"))
+ pr_warn("failed to get hardware mute state.\n");
+
+ state &= TPACPI_AML_MUTE_READ_MASK;
+
+ return state;
+}
+
+static struct tpacpi_led_classdev tpacpi_led_mute = {
+ .led_classdev = {
+ .name = "tpacpi::mute",
+ .brightness_set = mute_led_set,
+ .brightness_get = mute_led_get,
+ }
+};
+
+static int mute_led_init(struct ibm_init_struct *iibm)
+{
+ acpi_handle temp;
+
+ if (!ACPI_SUCCESS(acpi_get_handle(hkey_handle, "GSMS", &temp)))
+ return 0;
+
+ return led_classdev_register(&tpacpi_pdev->dev,
+ &tpacpi_led_mute.led_classdev);
+}
+
+static void mute_led_exit(void)
+{
+ acpi_handle temp;
+
+ if (!ACPI_SUCCESS(acpi_get_handle(hkey_handle, "GSMS", &temp)))
+ return;
+
+ led_classdev_unregister(&tpacpi_led_mute.led_classdev);
+}
+
+static struct ibm_struct mute_led_driver_data = {
+ .name = "mute_led",
+ .exit = mute_led_exit,
+};
+
/****************************************************************************
****************************************************************************
*
@@ -8782,6 +8867,10 @@ static struct ibm_init_struct ibms_init[] __initdata = {
.init = fan_init,
.data = &fan_driver_data,
},
+ {
+ .init = mute_led_init,
+ .data = &mute_led_driver_data,
+ },
};
static int __init set_ibm_param(const char *val, struct kernel_param *kp)
--
1.8.1.2
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