toshiba_acpi: Add accelerometer support
Recent Toshiba laptops now come equiped with a built in
accelerometer (TOS620A) device, but such device does not
expose the axes information, however, HCI calls 0x006d
and 0x00a6 can be used to query such info.
This patch adds support to read the axes values by
exposing them through the _position_ sysfs file.
Signed-off-by: Azael Avalos <coproscefalo@gmail.com>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index c8e8bfb..c971b0f 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -97,6 +97,8 @@
#define HCI_FAILURE 0x1000
#define HCI_NOT_SUPPORTED 0x8000
#define HCI_EMPTY 0x8c00
+#define HCI_DATA_NOT_AVAILABLE 0x8d20
+#define HCI_NOT_INITIALIZED 0x8d50
#define SCI_OPEN_CLOSE_OK 0x0044
#define SCI_ALREADY_OPEN 0x8100
#define SCI_NOT_OPENED 0x8200
@@ -111,13 +113,16 @@
#define HCI_HOTKEY_EVENT 0x001e
#define HCI_LCD_BRIGHTNESS 0x002a
#define HCI_WIRELESS 0x0056
+#define HCI_ACCELEROMETER 0x006d
#define HCI_KBD_ILLUMINATION 0x0095
#define HCI_ECO_MODE 0x0097
+#define HCI_ACCELEROMETER2 0x00a6
#define SCI_ILLUMINATION 0x014e
#define SCI_KBD_ILLUM_STATUS 0x015c
#define SCI_TOUCHPAD 0x050e
/* field definitions */
+#define HCI_ACCEL_MASK 0x7fff
#define HCI_HOTKEY_DISABLE 0x0b
#define HCI_HOTKEY_ENABLE 0x09
#define HCI_LCD_BRIGHTNESS_BITS 3
@@ -162,6 +167,7 @@
unsigned int kbd_led_registered:1;
unsigned int touchpad_supported:1;
unsigned int eco_supported:1;
+ unsigned int accelerometer_supported:1;
unsigned int sysfs_created:1;
struct mutex mutex;
@@ -624,6 +630,52 @@
return;
}
}
+
+/* Accelerometer support */
+static int toshiba_accelerometer_supported(struct toshiba_acpi_dev *dev)
+{
+ u32 in[HCI_WORDS] = { HCI_GET, HCI_ACCELEROMETER2, 0, 0, 0, 0 };
+ u32 out[HCI_WORDS];
+ acpi_status status;
+
+ /* Check if the accelerometer call exists,
+ * this call also serves as initialization
+ */
+ status = hci_raw(dev, in, out);
+ if (ACPI_FAILURE(status) || out[0] == SCI_INPUT_DATA_ERROR) {
+ pr_err("ACPI call to query the accelerometer failed\n");
+ return -EIO;
+ } else if (out[0] == HCI_DATA_NOT_AVAILABLE ||
+ out[0] == HCI_NOT_INITIALIZED) {
+ pr_err("Accelerometer not initialized\n");
+ return -EIO;
+ } else if (out[0] == HCI_NOT_SUPPORTED) {
+ pr_info("Accelerometer not supported\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int toshiba_accelerometer_get(struct toshiba_acpi_dev *dev,
+ u32 *xy, u32 *z)
+{
+ u32 in[HCI_WORDS] = { HCI_GET, HCI_ACCELEROMETER, 0, 1, 0, 0 };
+ u32 out[HCI_WORDS];
+ acpi_status status;
+
+ /* Check the Accelerometer status */
+ status = hci_raw(dev, in, out);
+ if (ACPI_FAILURE(status) || out[0] == SCI_INPUT_DATA_ERROR) {
+ pr_err("ACPI call to query the accelerometer failed\n");
+ return -EIO;
+ }
+
+ *xy = out[2];
+ *z = out[4];
+
+ return 0;
+}
/* Bluetooth rfkill handlers */
@@ -1257,6 +1309,27 @@
return sprintf(buf, "%i\n", state);
}
+
+static ssize_t toshiba_position_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct toshiba_acpi_dev *toshiba = dev_get_drvdata(dev);
+ u32 xyval, zval, tmp;
+ u16 x, y, z;
+ int ret;
+
+ xyval = zval = 0;
+ ret = toshiba_accelerometer_get(toshiba, &xyval, &zval);
+ if (ret < 0)
+ return ret;
+
+ x = xyval & HCI_ACCEL_MASK;
+ tmp = xyval >> HCI_MISC_SHIFT;
+ y = tmp & HCI_ACCEL_MASK;
+ z = zval & HCI_ACCEL_MASK;
+
+ return sprintf(buf, "%d %d %d\n", x, y, z);
+}
static DEVICE_ATTR(kbd_backlight_mode, S_IRUGO | S_IWUSR,
toshiba_kbd_bl_mode_show, toshiba_kbd_bl_mode_store);
@@ -1264,11 +1337,13 @@
toshiba_kbd_bl_timeout_show, toshiba_kbd_bl_timeout_store);
static DEVICE_ATTR(touchpad, S_IRUGO | S_IWUSR,
toshiba_touchpad_show, toshiba_touchpad_store);
+static DEVICE_ATTR(position, S_IRUGO, toshiba_position_show, NULL);
static struct attribute *toshiba_attributes[] = {
&dev_attr_kbd_backlight_mode.attr,
&dev_attr_kbd_backlight_timeout.attr,
&dev_attr_touchpad.attr,
+ &dev_attr_position.attr,
NULL,
};
@@ -1285,6 +1360,8 @@
exists = (drv->kbd_mode == SCI_KBD_MODE_AUTO) ? true : false;
else if (attr == &dev_attr_touchpad.attr)
exists = (drv->touchpad_supported) ? true : false;
+ else if (attr == &dev_attr_position.attr)
+ exists = (drv->accelerometer_supported) ? true : false;
return exists ? attr->mode : 0;
}
@@ -1643,6 +1720,9 @@
ret = toshiba_touchpad_get(dev, &dummy);
dev->touchpad_supported = !ret;
+
+ ret = toshiba_accelerometer_supported(dev);
+ dev->accelerometer_supported = !ret;
/* Determine whether or not BIOS supports fan and video interfaces */