Toshiba laptops have two ways of enabling/disabling the
touchpad, one with a hardwired button on top of the touchpad
that simply emmits scancodes to let userspace know it has changed,
and another with a SCI call that triggers (on Windows drivers)
whenever the user press the Fn-F9 (touchpad toggle) hotkey.
This patch adds support to enable/disable the touchpad
by exposing the _touchpad_ file in sysfs.
Signed-off-by: Azael Avalos <coproscef...@gmail.com>
---
drivers/platform/x86/toshiba_acpi.c | 81 +++++++++++++++++++++++++++++++++++++
1 file changed, 81 insertions(+)
diff --git a/drivers/platform/x86/toshiba_acpi.c
b/drivers/platform/x86/toshiba_acpi.c
index 9c718eb..0e14e9c 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -120,6 +120,7 @@ MODULE_LICENSE("GPL");
#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
@@ -168,6 +169,7 @@ struct toshiba_acpi_dev {
unsigned int kbd_led_registered:1;
unsigned int eco_supported:1;
unsigned int accelerometer_supported:1;
+ unsigned int touchpad_supported:1;
unsigned int sysfs_created:1;
struct mutex mutex;
@@ -643,6 +645,47 @@ static int toshiba_accelerometer_get(struct
toshiba_acpi_dev *dev,
return 0;
}
+/* TouchPad support */
+static int toshiba_touchpad_set(struct toshiba_acpi_dev *dev, u32 state)
+{
+ u32 result;
+ acpi_status status;
+
+ if (!sci_open(dev))
+ return -EIO;
+
+ status = sci_write(dev, SCI_TOUCHPAD, state, &result);
+ sci_close(dev);
+ if (ACPI_FAILURE(status)) {
+ pr_err("ACPI call to set the touchpad failed\n");
+ return -EIO;
+ } else if (result == NOT_SUPPORTED) {
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int toshiba_touchpad_get(struct toshiba_acpi_dev *dev, u32 *state)
+{
+ u32 result;
+ acpi_status status;
+
+ if (!sci_open(dev))
+ return -EIO;
+
+ status = sci_read(dev, SCI_TOUCHPAD, state, &result);
+ sci_close(dev);
+ if (ACPI_FAILURE(status)) {
+ pr_err("ACPI call to query the touchpad failed\n");
+ return -EIO;
+ } else if (result == NOT_SUPPORTED) {
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
/* Bluetooth rfkill handlers */
static u32 hci_get_bt_present(struct toshiba_acpi_dev *dev, bool *present)
@@ -1267,16 +1310,49 @@ static ssize_t toshiba_position_show(struct device *dev,
return sprintf(buf, "%d %d %d\n", x, y, z);
}
+static ssize_t toshiba_touchpad_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct toshiba_acpi_dev *toshiba = dev_get_drvdata(dev);
+ int state;
+
+ /* Set the TouchPad on/off, 0 - Disable | 1 - Enable */
+ if (sscanf(buf, "%i", &state) == 1 && (state == 0 || state == 1)) {
+ if (toshiba_touchpad_set(toshiba, state) < 0)
+ return -EIO;
+ }
+
+ return count;
+}
+
+static ssize_t toshiba_touchpad_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct toshiba_acpi_dev *toshiba = dev_get_drvdata(dev);
+ u32 state;
+ int ret;
+
+ ret = toshiba_touchpad_get(toshiba, &state);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%i\n", state);
+}
+
static DEVICE_ATTR(kbd_backlight_mode, S_IRUGO | S_IWUSR,
toshiba_kbd_bl_mode_show, toshiba_kbd_bl_mode_store);
static DEVICE_ATTR(kbd_backlight_timeout, S_IRUGO | S_IWUSR,
toshiba_kbd_bl_timeout_show, toshiba_kbd_bl_timeout_store);
static DEVICE_ATTR(position, S_IRUGO, toshiba_position_show, NULL);
+static DEVICE_ATTR(touchpad, S_IRUGO | S_IWUSR,
+ toshiba_touchpad_show, toshiba_touchpad_store);
static struct attribute *toshiba_attributes[] = {
&dev_attr_kbd_backlight_mode.attr,
&dev_attr_kbd_backlight_timeout.attr,
&dev_attr_position.attr,
+ &dev_attr_touchpad.attr,
NULL,
};
@@ -1294,6 +1370,8 @@ static umode_t toshiba_sysfs_is_visible(struct kobject
*kobj,
exists = (driver->kbd_mode == SCI_KBD_MODE_AUTO) ? true : false;
else if (attr == &dev_attr_position.attr)
exists = (driver->accelerometer_supported) ? true : false;
+ else if (attr == &dev_attr_touchpad.attr)
+ exists = (driver->touchpad_supported) ? true : false;
return exists ? attr->mode : 0;
}
@@ -1679,6 +1757,9 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
ret = toshiba_accelerometer_supported(dev);
dev->accelerometer_supported = !ret;
+ ret = toshiba_touchpad_get(dev, &dummy);
+ dev->touchpad_supported = !ret;
+
/* Determine whether or not BIOS supports fan and video interfaces */
ret = get_video_status(dev, &dummy);
--
1.8.1.4
--
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