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toshiba_acpi: Add support to enable/disable USB 3

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Toshiba laptops that come with USB 3 ports have a feature that lets
them disable USB 3 functionality and act as a regular USB 2 port, and
thus, saving power.

This patch adds support to that feature, by creating a sysfs entry
named "usb_three", acceptig only two parameters, 0 to disable the
USB 3 (acting as a USB 2) and 1 to enable it, however, a reboot is
needed everytime this is toggled.

Signed-off-by: Azael Avalos <coproscefalo@gmail.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
This commit is contained in:
Azael Avalos 2015-02-10 21:09:20 -07:00 committed by Darren Hart
parent 35d53ceaf7
commit 17fe4b3d31
1 changed files with 103 additions and 0 deletions
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103
drivers/platform/x86/toshiba_acpi.c
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@ -127,6 +127,7 @@ MODULE_LICENSE("GPL");
#define SCI_USB_SLEEP_CHARGE 0x0150
#define SCI_KBD_ILLUM_STATUS 0x015c
#define SCI_USB_SLEEP_MUSIC 0x015e
#define SCI_USB_THREE 0x0169
#define SCI_TOUCHPAD 0x050e
#define SCI_KBD_FUNCTION_KEYS 0x0522
@ -197,6 +198,7 @@ struct toshiba_acpi_dev {
unsigned int usb_sleep_music_supported:1;
unsigned int kbd_function_keys_supported:1;
unsigned int panel_power_on_supported:1;
unsigned int usb_three_supported:1;
unsigned int sysfs_created:1;
struct mutex mutex;
@ -1095,6 +1097,51 @@ static int toshiba_panel_power_on_set(struct toshiba_acpi_dev *dev, u32 state)
return 0;
}
/* USB Three */
static int toshiba_usb_three_get(struct toshiba_acpi_dev *dev, u32 *state)
{
u32 result;
if (!sci_open(dev))
return -EIO;
result = sci_read(dev, SCI_USB_THREE, state);
sci_close(dev);
if (result == TOS_FAILURE) {
pr_err("ACPI call to get USB 3 failed\n");
return -EIO;
} else if (result == TOS_NOT_SUPPORTED) {
pr_info("USB 3 not supported\n");
return -ENODEV;
} else if (result == TOS_INPUT_DATA_ERROR) {
return -EIO;
}
return 0;
}
static int toshiba_usb_three_set(struct toshiba_acpi_dev *dev, u32 state)
{
u32 result;
if (!sci_open(dev))
return -EIO;
result = sci_write(dev, SCI_USB_THREE, state);
sci_close(dev);
if (result == TOS_FAILURE) {
pr_err("ACPI call to set USB 3 failed\n");
return -EIO;
} else if (result == TOS_NOT_SUPPORTED) {
pr_info("USB 3 not supported\n");
return -ENODEV;
} else if (result == TOS_INPUT_DATA_ERROR) {
return -EIO;
}
return 0;
}
/* Bluetooth rfkill handlers */
static u32 hci_get_bt_present(struct toshiba_acpi_dev *dev, bool *present)
@ -1691,6 +1738,12 @@ static ssize_t toshiba_panel_power_on_show(struct device *dev,
static ssize_t toshiba_panel_power_on_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count);
static ssize_t toshiba_usb_three_show(struct device *dev,
struct device_attribute *attr,
char *buf);
static ssize_t toshiba_usb_three_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count);
static DEVICE_ATTR(version, S_IRUGO, toshiba_version_show, NULL);
static DEVICE_ATTR(fan, S_IRUGO | S_IWUSR,
@ -1723,6 +1776,8 @@ static DEVICE_ATTR(kbd_function_keys, S_IRUGO | S_IWUSR,
static DEVICE_ATTR(panel_power_on, S_IRUGO | S_IWUSR,
toshiba_panel_power_on_show,
toshiba_panel_power_on_store);
static DEVICE_ATTR(usb_three, S_IRUGO | S_IWUSR,
toshiba_usb_three_show, toshiba_usb_three_store);
static struct attribute *toshiba_attributes[] = {
&dev_attr_version.attr,
@ -1739,6 +1794,7 @@ static struct attribute *toshiba_attributes[] = {
&dev_attr_usb_sleep_music.attr,
&dev_attr_kbd_function_keys.attr,
&dev_attr_panel_power_on.attr,
&dev_attr_usb_three.attr,
NULL,
};
@ -2264,6 +2320,48 @@ static ssize_t toshiba_panel_power_on_store(struct device *dev,
return count;
}
static ssize_t toshiba_usb_three_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_usb_three_get(toshiba, &state);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", state);
}
static ssize_t toshiba_usb_three_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;
int ret;
ret = kstrtoint(buf, 0, &state);
if (ret)
return ret;
/* Check for USB 3 mode where:
* 0 - Disabled (Acts like a USB 2 port, saving power)
* 1 - Enabled
*/
if (state != 0 && state != 1)
return -EINVAL;
ret = toshiba_usb_three_set(toshiba, state);
if (ret)
return ret;
pr_info("Reboot for changes to USB 3 to take effect");
return count;
}
static umode_t toshiba_sysfs_is_visible(struct kobject *kobj,
struct attribute *attr, int idx)
{
@ -2293,6 +2391,8 @@ static umode_t toshiba_sysfs_is_visible(struct kobject *kobj,
exists = (drv->kbd_function_keys_supported) ? true : false;
else if (attr == &dev_attr_panel_power_on.attr)
exists = (drv->panel_power_on_supported) ? true : false;
else if (attr == &dev_attr_usb_three.attr)
exists = (drv->usb_three_supported) ? true : false;
return exists ? attr->mode : 0;
}
@ -2717,6 +2817,9 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
ret = toshiba_panel_power_on_get(dev, &dummy);
dev->panel_power_on_supported = !ret;
ret = toshiba_usb_three_get(dev, &dummy);
dev->usb_three_supported = !ret;
/* Determine whether or not BIOS supports fan and video interfaces */
ret = get_video_status(dev, &dummy);