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toshiba_acpi: Add touchpad enable/disable support-

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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: Azael Avalos <coproscefalo@gmail.com>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
This commit is contained in:
Azael Avalos 2014-03-25 20:38:32 -06:00 committed by Matthew Garrett
parent 360f0f39d0
commit 9d8658acd6
1 changed files with 81 additions and 0 deletions
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81
drivers/platform/x86/toshiba_acpi.c
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@ -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;
@ -527,6 +529,47 @@ static void toshiba_kbd_backlight_set(struct led_classdev *cdev,
return;
}
}
/* 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 */
@ -1130,15 +1173,48 @@ 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;
}
@ -1496,6 +1574,9 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
if (!led_classdev_register(&dev->acpi_dev->dev, &dev->kbd_led))
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 */