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Subject[PATCH resend 5/6] toshiba_acpi: Add support to enable/disable USB 3
Date
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.

Signed-off-by: Azael Avalos <coproscefalo@gmail.com>
---
drivers/platform/x86/toshiba_acpi.c | 101 ++++++++++++++++++++++++++++++++++++
1 file changed, 101 insertions(+)

diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index baf3376..c5b1ab5 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -126,6 +126,7 @@ 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

@@ -196,6 +197,7 @@ 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;
@@ -1078,6 +1080,51 @@ 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)
@@ -1674,6 +1721,12 @@ 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,
@@ -1706,6 +1759,8 @@ 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,
@@ -1722,6 +1777,7 @@ 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,
};

@@ -2243,6 +2299,46 @@ 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;
+
+ return count;
+}
+
static umode_t toshiba_sysfs_is_visible(struct kobject *kobj,
struct attribute *attr, int idx)
{
@@ -2272,6 +2368,8 @@ 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;
}
@@ -2696,6 +2794,9 @@ 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);
--
2.2.2


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