From 17fe4b3d31e6b1d3afd40a34849fa353d0ca5616 Mon Sep 17 00:00:00 2001 From: Azael Avalos Date: Tue, 10 Feb 2015 21:09:20 -0700 Subject: toshiba_acpi: Add support to enable/disable USB 3 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 Signed-off-by: Darren Hart --- drivers/platform/x86/toshiba_acpi.c | 103 ++++++++++++++++++++++++++++++++++++ 1 file changed, 103 insertions(+) (limited to 'drivers/platform') diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c index 70370d3f5dcf..b162a54f03a7 100644 --- a/drivers/platform/x86/toshiba_acpi.c +++ b/drivers/platform/x86/toshiba_acpi.c @@ -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); -- cgit v1.2.3