[PATCH 1/4] toshiba_acpi: Add support for USB Sleep and Charge function

Azael Avalos
2015-01-14T21:40:31Z

Newer Toshiba models now come with a feature called Sleep and Charge,
where the computer USB ports remain powered when the computer is
asleep or turned off.

This patch adds support to such feature, creating a sysfs entry
called "usb_sleep_charge" to set the desired charging mode or to
disable it.

The sysfs entry accepts three parameters, 0x0, 0x9 and 0x21, beign
disabled, alternate and auto respectively.

Signed-off-by: Azael Avalos <coproscefalo@gmail.com>
---
drivers/platform/x86/toshiba_acpi.c | 112 ++++++++++++++++++++++++++++++++++++
1 file changed, 112 insertions(+)

diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index 71ac7c12..b03129d 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -122,6 +122,7 @@ MODULE_LICENSE("GPL");
#define HCI_ECO_MODE 0x0097
#define HCI_ACCELEROMETER2 0x00a6
#define SCI_ILLUMINATION 0x014e
+#define SCI_USB_SLEEP_CHARGE 0x0150
#define SCI_KBD_ILLUM_STATUS 0x015c
#define SCI_TOUCHPAD 0x050e

@@ -146,6 +147,10 @@ MODULE_LICENSE("GPL");
#define SCI_KBD_MODE_ON 0x8
#define SCI_KBD_MODE_OFF 0x10
#define SCI_KBD_TIME_MAX 0x3c001a
+#define SCI_USB_CHARGE_MODE_MASK 0xff
+#define SCI_USB_CHARGE_DISABLED 0x30000
+#define SCI_USB_CHARGE_ALTERNATE 0x30009
+#define SCI_USB_CHARGE_AUTO 0x30021

struct toshiba_acpi_dev {
struct acpi_device *acpi_dev;
@@ -177,6 +182,7 @@ struct toshiba_acpi_dev {
unsigned int touchpad_supported:1;
unsigned int eco_supported:1;
unsigned int accelerometer_supported:1;
+ unsigned int usb_sleep_charge_supported:1;
unsigned int sysfs_created:1;

struct mutex mutex;
@@ -761,6 +767,53 @@ static int toshiba_accelerometer_get(struct toshiba_acpi_dev *dev,
return 0;
}

+/* Sleep (Charge and Music) utilities support */
+static int toshiba_usb_sleep_charge_get(struct toshiba_acpi_dev *dev,
+ u32 *mode)
+{
+ u32 result;
+
+ if (!sci_open(dev))
+ return -EIO;
+
+ result = sci_read(dev, SCI_USB_SLEEP_CHARGE, mode);
+ sci_close(dev);
+ if (result == TOS_FAILURE) {
+ pr_err("ACPI call to set USB S&C mode failed\n");
+ return -EIO;
+ } else if (result == TOS_NOT_SUPPORTED) {
+ pr_info("USB Sleep and Charge not supported\n");
+ return -ENODEV;
+ } else if (result == TOS_INPUT_DATA_ERROR) {
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int toshiba_usb_sleep_charge_set(struct toshiba_acpi_dev *dev,
+ u32 mode)
+{
+ u32 result;
+
+ if (!sci_open(dev))
+ return -EIO;
+
+ result = sci_write(dev, SCI_USB_SLEEP_CHARGE, mode);
+ sci_close(dev);
+ if (result == TOS_FAILURE) {
+ pr_err("ACPI call to set USB S&C mode failed\n");
+ return -EIO;
+ } else if (result == TOS_NOT_SUPPORTED) {
+ pr_info("USB Sleep and Charge 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)
@@ -1314,6 +1367,12 @@ static ssize_t toshiba_touchpad_show(struct device *dev,
static ssize_t toshiba_position_show(struct device *dev,
struct device_attribute *attr,
char *buf);
+static ssize_t toshiba_usb_sleep_charge_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf);
+static ssize_t toshiba_usb_sleep_charge_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count);

static DEVICE_ATTR(kbd_backlight_mode, S_IRUGO | S_IWUSR,
toshiba_kbd_bl_mode_show, toshiba_kbd_bl_mode_store);
@@ -1325,6 +1384,9 @@ static DEVICE_ATTR(kbd_backlight_timeout, S_IRUGO | S_IWUSR,
static DEVICE_ATTR(touchpad, S_IRUGO | S_IWUSR,
toshiba_touchpad_show, toshiba_touchpad_store);
static DEVICE_ATTR(position, S_IRUGO, toshiba_position_show, NULL);
+static DEVICE_ATTR(usb_sleep_charge, S_IRUGO | S_IWUSR,
+ toshiba_usb_sleep_charge_show,
+ toshiba_usb_sleep_charge_store);

static struct attribute *toshiba_attributes[] = {
&dev_attr_kbd_backlight_mode.attr,
@@ -1333,6 +1395,7 @@ static struct attribute *toshiba_attributes[] = {
&dev_attr_kbd_backlight_timeout.attr,
&dev_attr_touchpad.attr,
&dev_attr_position.attr,
+ &dev_attr_usb_sleep_charge.attr,
NULL,
};

@@ -1550,6 +1613,50 @@ static ssize_t toshiba_position_show(struct device *dev,
return sprintf(buf, "%d %d %d\n", x, y, z);
}

+static ssize_t toshiba_usb_sleep_charge_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_sleep_charge_get(toshiba, &state);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%x\n", state & SCI_USB_CHARGE_MODE_MASK);
+}
+
+static ssize_t toshiba_usb_sleep_charge_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;
+
+ /* Set the USB charging mode where:
+ * 0x30000 - Disable
+ * 0x30009 - Alternate
+ * 0x30021 - Auto
+ */
+ state |= 0x30000;
+ if (state != SCI_USB_CHARGE_DISABLED && state != SCI_USB_CHARGE_AUTO &&
+ state != SCI_USB_CHARGE_ALTERNATE)
+ return -EINVAL;
+
+ ret = toshiba_usb_sleep_charge_set(toshiba, state);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
static umode_t toshiba_sysfs_is_visible(struct kobject *kobj,
struct attribute *attr, int idx)
{
@@ -1565,6 +1672,8 @@ static umode_t toshiba_sysfs_is_visible(struct kobject *kobj,
exists = (drv->touchpad_supported) ? true : false;
else if (attr == &dev_attr_position.attr)
exists = (drv->accelerometer_supported) ? true : false;
+ else if (attr == &dev_attr_usb_sleep_charge.attr)
+ exists = (drv->usb_sleep_charge_supported) ? true : false;

return exists ? attr->mode : 0;
}
@@ -1974,6 +2083,9 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
ret = toshiba_accelerometer_supported(dev);
dev->accelerometer_supported = !ret;

+ ret = toshiba_usb_sleep_charge_get(dev, &dummy);
+ dev->usb_sleep_charge_supported = !ret;
+
/* Determine whether or not BIOS supports fan and video interfaces */

ret = get_video_status(dev, &dummy);
--
2.2.1