The LEDs are currently not visible to userspace, for security reasons. They are exported through thinkpad_acpi.h for use by the snd-hda-intel driver.
Thanks to Alex Hung alex.hung@canonical.com and Takashi Iwai tiwai@suse.de for writing parts of this patch.
Signed-off-by: David Henningsson david.henningsson@canonical.com --- Documentation/laptops/thinkpad-acpi.txt | 7 ++- drivers/platform/x86/thinkpad_acpi.c | 92 ++++++++++++++++++++++++++++++- include/linux/thinkpad_acpi.h | 15 +++++ 3 files changed, 111 insertions(+), 3 deletions(-) create mode 100644 include/linux/thinkpad_acpi.h
diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt index 86c5236..fc04c14 100644 --- a/Documentation/laptops/thinkpad-acpi.txt +++ b/Documentation/laptops/thinkpad-acpi.txt @@ -1,7 +1,7 @@ ThinkPad ACPI Extras Driver
- Version 0.24 - December 11th, 2009 + Version 0.25 + October 16th, 2013
Borislav Deianov borislav@users.sf.net Henrique de Moraes Holschuh hmh@hmh.eng.br @@ -741,6 +741,9 @@ compiled with the CONFIG_THINKPAD_ACPI_UNSAFE_LEDS option enabled. Distributions must never enable this option. Individual users that are aware of the consequences are welcome to enabling it.
+Audio mute and microphone mute LEDs are supported, but currently not +visible to userspace. They are used by the snd-hda-intel audio driver. + procfs notes:
The available commands are: diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c index 03ca6c1..0b7efb2 100644 --- a/drivers/platform/x86/thinkpad_acpi.c +++ b/drivers/platform/x86/thinkpad_acpi.c @@ -23,7 +23,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#define TPACPI_VERSION "0.24" +#define TPACPI_VERSION "0.25" #define TPACPI_SYSFS_VERSION 0x020700
/* @@ -88,6 +88,7 @@
#include <linux/pci_ids.h>
+#include <linux/thinkpad_acpi.h>
/* ThinkPad CMOS commands */ #define TP_CMOS_VOLUME_DOWN 0 @@ -8350,6 +8351,91 @@ static struct ibm_struct fan_driver_data = { .resume = fan_resume, };
+/************************************************************************* + * Mute LED subdriver + */ + + +struct tp_led_table { + acpi_string name; + int on_value; + int off_value; + int state; +}; + +static struct tp_led_table led_tables[] = { + [TPACPI_LED_MUTE] = { + .name = "SSMS", + .on_value = 1, + .off_value = 0, + }, + [TPACPI_LED_MICMUTE] = { + .name = "MMTS", + .on_value = 2, + .off_value = 0, + }, +}; + +static int mute_led_on_off(struct tp_led_table *t, bool state) +{ + acpi_handle temp; + int output; + + if (!ACPI_SUCCESS(acpi_get_handle(hkey_handle, t->name, &temp))) { + pr_warn("Thinkpad ACPI has no %s interface.\n", t->name); + return -EIO; + } + + if (!acpi_evalf(hkey_handle, &output, t->name, "dd", + state ? t->on_value : t->off_value)) + return -EIO; + + t->state = state; + return state; +} + +int tpacpi_led_set(int whichled, bool on) +{ + struct tp_led_table *t; + + if (whichled < 0 || whichled >= TPACPI_LED_MAX) + return -EINVAL; + + t = &led_tables[whichled]; + if (t->state < 0 || t->state == on) + return t->state; + return mute_led_on_off(t, on); +} +EXPORT_SYMBOL_GPL(tpacpi_led_set); + +static int mute_led_init(struct ibm_init_struct *iibm) +{ + acpi_handle temp; + int i; + + for (i = 0; i < TPACPI_LED_MAX; i++) { + struct tp_led_table *t = &led_tables[i]; + if (ACPI_SUCCESS(acpi_get_handle(hkey_handle, t->name, &temp))) + mute_led_on_off(t, false); + else + t->state = -ENODEV; + } + return 0; +} + +static void mute_led_exit(void) +{ + int i; + + for (i = 0; i < TPACPI_LED_MAX; i++) + tpacpi_led_set(i, false); +} + +static struct ibm_struct mute_led_driver_data = { + .name = "mute_led", + .exit = mute_led_exit, +}; + /**************************************************************************** **************************************************************************** * @@ -8768,6 +8854,10 @@ 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) diff --git a/include/linux/thinkpad_acpi.h b/include/linux/thinkpad_acpi.h new file mode 100644 index 0000000..361de59 --- /dev/null +++ b/include/linux/thinkpad_acpi.h @@ -0,0 +1,15 @@ +#ifndef __THINKPAD_ACPI_H__ +#define __THINKPAD_ACPI_H__ + +/* These two functions return 0 if success, or negative error code + (e g -ENODEV if no led present) */ + +enum { + TPACPI_LED_MUTE, + TPACPI_LED_MICMUTE, + TPACPI_LED_MAX, +}; + +int tpacpi_led_set(int whichled, bool on); + +#endif