ACPI: thinkpad-acpi: add sysfs led class support for thinklight (v3.1)

Add a sysfs led class interface to the thinklight (light subdriver).

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Len Brown <len.brown@intel.com>

2 files changed, 76 insertions, 6 deletions

diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index a41bc893f8d6..af1f2bcb6f66 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -693,16 +693,31 @@ while others are still having problems. For more information:
 
 https://bugs.freedesktop.org/show_bug.cgi?id=2000
 
-ThinkLight control -- /proc/acpi/ibm/light
-------------------------------------------
+ThinkLight control
+------------------
+
+procfs: /proc/acpi/ibm/light
+sysfs attributes: as per led class, for the "tpacpi::thinklight" led
+
+procfs notes:
 
-The current status of the ThinkLight can be found in this file. A few
-models which do not make the status available will show it as
-"unknown". The available commands are:
+The ThinkLight status can be read and set through the procfs interface.  A
+few models which do not make the status available will show the ThinkLight
+status as "unknown". The available commands are:
 
         echo on  > /proc/acpi/ibm/light
         echo off > /proc/acpi/ibm/light
 
+sysfs notes:
+
+The ThinkLight sysfs interface is documented by the led class
+documentation, in Documentation/leds-class.txt.  The ThinkLight led name
+is "tpacpi::thinklight".
+
+Due to limitations in the sysfs led class, if the status of the thinklight
+cannot be read or if it is unknown, thinkpad-acpi will report it as "off".
+It is impossible to know if the status returned through sysfs is valid.
+
 Docking / undocking -- /proc/acpi/ibm/dock
 ------------------------------------------
 
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 5a3fb09f10d3..38a119bd931e 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -3280,13 +3280,49 @@ static int light_set_status(int status)
         return -ENXIO;
 }
 
+static void light_set_status_worker(struct work_struct *work)
+{
+        struct tpacpi_led_classdev *data =
+                        container_of(work, struct tpacpi_led_classdev, work);
+
+        if (likely(tpacpi_lifecycle == TPACPI_LIFE_RUNNING))
+                light_set_status((data->new_brightness != LED_OFF));
+}
+
+static void light_sysfs_set(struct led_classdev *led_cdev,
+                        enum led_brightness brightness)
+{
+        struct tpacpi_led_classdev *data =
+                container_of(led_cdev,
+                             struct tpacpi_led_classdev,
+                             led_classdev);
+        data->new_brightness = brightness;
+        schedule_work(&data->work);
+}
+
+static enum led_brightness light_sysfs_get(struct led_classdev *led_cdev)
+{
+        return (light_get_status() == 1)? LED_FULL : LED_OFF;
+}
+
+static struct tpacpi_led_classdev tpacpi_led_thinklight = {
+        .led_classdev = {
+                .name           = "tpacpi::thinklight",
+                .brightness_set = &light_sysfs_set,
+                .brightness_get = &light_sysfs_get,
+        }
+};
+
 static int __init light_init(struct ibm_init_struct *iibm)
 {
+        int rc = 0;
+
         vdbg_printk(TPACPI_DBG_INIT, "initializing light subdriver\n");
 
         TPACPI_ACPIHANDLE_INIT(ledb);
         TPACPI_ACPIHANDLE_INIT(lght);
         TPACPI_ACPIHANDLE_INIT(cmos);
+        INIT_WORK(&tpacpi_led_thinklight.work, light_set_status_worker);
 
         /* light not supported on 570, 600e/x, 770e, 770x, G4x, R30, R31 */
         tp_features.light = (cmos_handle || lght_handle) && !ledb_handle;
@@ -3300,7 +3336,25 @@ static int __init light_init(struct ibm_init_struct *iibm)
         vdbg_printk(TPACPI_DBG_INIT, "light is %s\n",
                 str_supported(tp_features.light));
 
-        return (tp_features.light)? 0 : 1;
+        if (tp_features.light) {
+                rc = led_classdev_register(&tpacpi_pdev->dev,
+                                           &tpacpi_led_thinklight.led_classdev);
+        }
+
+        if (rc < 0) {
+                tp_features.light = 0;
+                tp_features.light_status = 0;
+        } else {
+                rc = (tp_features.light)? 0 : 1;
+        }
+        return rc;
+}
+
+static void light_exit(void)
+{
+        led_classdev_unregister(&tpacpi_led_thinklight.led_classdev);
+        if (work_pending(&tpacpi_led_thinklight.work))
+                flush_scheduled_work();
 }
 
 static int light_read(char *p)
@@ -3348,6 +3402,7 @@ static struct ibm_struct light_driver_data = {
         .name = "light",
         .read = light_read,
         .write = light_write,
+        .exit = light_exit,
 };
 
 /*************************************************************************