[PATCH 2/2] ACER: Add support for ambient light sensor

[Marek Vasut]

This is the ambient light sensor found on Iconia W500.

Signed-off-by: Marek Vasut <ma...@denx.de>
Cc: joeyli <j...@suse.com>
---
 drivers/platform/x86/acer-wmi.c |   86 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)

diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index edb6bad..a58c415 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -203,6 +203,7 @@ struct hotkey_function_type_aa {
 #define ACER_CAP_BRIGHTNESS            (1<<3)
 #define ACER_CAP_THREEG                        (1<<4)
 #define ACER_CAP_ACCEL                 (1<<5)
+#define ACER_CAP_ALS                   (1<<6)
 #define ACER_CAP_ANY                   (0xFFFFFFFF)
 
 /*
@@ -1378,6 +1379,63 @@ static void acer_backlight_exit(void)
 }
 
 /*
+ * Ambient light sensor device
+ */
+static acpi_handle alsd_handle;
+
+static int acer_als_init(void)
+{
+       union acpi_object in_obj;
+       struct acpi_object_list params;
+       struct acpi_buffer out;
+       union acpi_object out_obj;
+       acpi_status status;
+
+       status = acpi_evaluate_object(alsd_handle, "_INI", NULL, NULL);
+       if (ACPI_FAILURE(status))
+               return -1;
+
+       params.count = 1;
+       params.pointer = &in_obj;
+       in_obj.type = ACPI_TYPE_INTEGER;
+       /*
+        * Unknown argument of both GLOV and GUPV, set to 5.
+        * GLOV - G? Lower Value ?
+        * GUPV - G? Upper Value ?
+        */
+       in_obj.integer.value = 5;
+       out.length = sizeof(out_obj);
+       out.pointer = &out_obj;
+
+       acpi_evaluate_object(alsd_handle, "GLOV", &params, &out);
+       acpi_evaluate_object(alsd_handle, "GUPV", &params, &out);
+
+       return 0;
+}
+
+static ssize_t acer_als_show(struct device *dev, struct device_attribute *attr,
+                       char *buf)
+{
+       acpi_status status;
+       struct acpi_buffer output;
+       union acpi_object out_obj;
+
+       status = acpi_evaluate_object(alsd_handle, "S3WK", NULL, NULL);
+       if (ACPI_FAILURE(status))
+               return -1;
+
+       output.length = sizeof(out_obj);
+       output.pointer = &out_obj;
+       status = acpi_evaluate_object(alsd_handle, "_ALI", NULL, &output);
+       if (ACPI_FAILURE(status))
+               return -1;
+
+       return sprintf(buf, "%d\n", (u16)out_obj.integer.value);
+}
+
+static DEVICE_ATTR(ls_switch, S_IRUGO, acer_als_show, NULL);
+
+/*
  * Accelerometer device
  */
 static acpi_handle gsensor_handle;
@@ -1856,6 +1914,21 @@ err_free_dev:
        return err;
 }
 
+static int __init acer_wmi_alsd_setup(void)
+{
+       int err;
+
+       err = acer_wmi_get_handle("ALSD", "ACPI0008", &alsd_handle);
+       if (err)
+               return err;
+
+       interface->capability |= ACER_CAP_ALS;
+
+       acer_als_init();
+
+       return 0;
+}
+
 static void acer_wmi_accel_destroy(void)
 {
        input_unregister_device(acer_wmi_accel_dev);
@@ -2020,6 +2093,9 @@ static int acer_platform_resume(struct platform_device 
*device)
        if (has_cap(ACER_CAP_ACCEL))
                acer_gsensor_init();
 
+       if (has_cap(ACER_CAP_ALS))
+               acer_als_init();
+
        return 0;
 }
 
@@ -2052,6 +2128,8 @@ static int remove_sysfs(struct platform_device *device)
 {
        if (has_cap(ACER_CAP_THREEG))
                device_remove_file(&device->dev, &dev_attr_threeg);
+       if (has_cap(ACER_CAP_ALS))
+               device_remove_file(&device->dev, &dev_attr_ls_switch);
 
        device_remove_file(&device->dev, &dev_attr_interface);
 
@@ -2069,6 +2147,13 @@ static int create_sysfs(void)
                        goto error_sysfs;
        }
 
+       if (has_cap(ACER_CAP_ALS)) {
+               retval = device_create_file(&acer_platform_device->dev,
+                       &dev_attr_ls_switch);
+               if (retval)
+                       goto error_sysfs;
+       }
+
        retval = device_create_file(&acer_platform_device->dev,
                &dev_attr_interface);
        if (retval)
@@ -2198,6 +2283,7 @@ static int __init acer_wmi_init(void)
        }
 
        acer_wmi_accel_setup();
+       acer_wmi_alsd_setup();
 
        err = platform_driver_register(&acer_platform_driver);
        if (err) {
-- 
1.7.10

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