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Commit 9d8658ac authored by Azael Avalos's avatar Azael Avalos Committed by Matthew Garrett
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toshiba_acpi: Add touchpad enable/disable support- 



Toshiba laptops have two ways of letting userspace
know the touchpad has changed state, one with a
button on top of the touchpad that simply emmits
scancodes whenever enabled/disabled, and another one
by pressing Fn-F9 (touchpad toggle) hotkey.

This patch adds support to enable/disable the touchpad
by exposing the _touchpad_ file in sysfs that simply
makes a call to a SCI register, imitating what
Toshiba provided software does on Windows.

Signed-off-by: default avatarAzael Avalos <coproscefalo@gmail.com>
Signed-off-by: default avatarMatthew Garrett <matthew.garrett@nebula.com>
parent 360f0f39

drivers/platform/x86/toshiba_acpi.c

+81 −0
Original line number Diff line number Diff line
@@ -114,6 +114,7 @@ MODULE_LICENSE("GPL"); 
#define HCI_KBD_ILLUMINATION		0x0095

#define SCI_ILLUMINATION		0x014e

#define SCI_KBD_ILLUM_STATUS		0x015c

#define SCI_TOUCHPAD			0x050e



/* field definitions */

#define HCI_HOTKEY_DISABLE		0x0b
@@ -157,6 +158,7 @@ struct toshiba_acpi_dev { 
	unsigned int tr_backlight_supported:1;

	unsigned int kbd_illum_supported:1;

	unsigned int kbd_led_registered:1;

	unsigned int touchpad_supported:1;

	unsigned int sysfs_created:1;



	struct mutex mutex;
@@ -528,6 +530,47 @@ static void toshiba_kbd_backlight_set(struct led_classdev *cdev, 
	}

}

 

/* 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 == HCI_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 == HCI_NOT_SUPPORTED) {

		return -ENODEV;

	}



	return 0;

}



/* Bluetooth rfkill handlers */



static u32 hci_get_bt_present(struct toshiba_acpi_dev *dev, bool *present)
@@ -1131,14 +1174,47 @@ static ssize_t toshiba_kbd_bl_timeout_show(struct device *dev, 
	return sprintf(buf, "%i\n", time >> HCI_MISC_SHIFT);

}

 

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(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_touchpad.attr,

	NULL,

};
@@ -1153,6 +1229,8 @@ static umode_t toshiba_sysfs_is_visible(struct kobject *kobj, 
		exists = (drv->kbd_illum_supported) ? true : false;

	else if (attr == &dev_attr_kbd_backlight_timeout.attr)

		exists = (drv->kbd_mode == SCI_KBD_MODE_AUTO) ? true : false;

	else if (attr == &dev_attr_touchpad.attr)

		exists = (drv->touchpad_supported) ? true : false;



	return exists ? attr->mode : 0;

}
@@ -1497,6 +1575,9 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev) 
			dev->kbd_led_registered = 1;

	}

 

	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);