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USB: android: Provide sysfs file for enabling remote wakeup capability

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USB device can specify remote wakeup capability in the configuration
descriptor.  Host may select remote wakeup feature before suspending
the device.  Remote wakeup capability is disabled by default in
android gadget.  Provide sysfs file for enabling remote wakeup capability.
User space can enable/disable this capability based on the selected
composition.  This will also allow testing suspend/resume chapter 9 tests
with remote wakeup enabled.

Change-Id: Ib24aa6c05ace697564ebe5940e62e8f65db4d7c3
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
This commit is contained in:
Pavankumar Kondeti 2011-12-07 13:32:40 +05:30 committed by Stephen Boyd
parent bb6b3366e8
commit bfc4e2748e
1 changed files with 29 additions and 0 deletions
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29
drivers/usb/gadget/android.c
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@ -977,6 +977,32 @@ static int android_enable_function(struct android_dev *dev, char *name)
/*-------------------------------------------------------------------------*/
/* /sys/class/android_usb/android%d/ interface */
static ssize_t remote_wakeup_show(struct device *pdev,
struct device_attribute *attr, char *buf)
{
return snprintf(buf, PAGE_SIZE, "%d\n",
!!(android_config_driver.bmAttributes &
USB_CONFIG_ATT_WAKEUP));
}
static ssize_t remote_wakeup_store(struct device *pdev,
struct device_attribute *attr, const char *buff, size_t size)
{
int enable = 0;
sscanf(buff, "%d", &enable);
pr_debug("android_usb: %s remote wakeup\n",
enable ? "enabling" : "disabling");
if (enable)
android_config_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
else
android_config_driver.bmAttributes &= ~USB_CONFIG_ATT_WAKEUP;
return size;
}
static ssize_t
functions_show(struct device *pdev, struct device_attribute *attr, char *buf)
{
@ -1182,6 +1208,8 @@ static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, enable_show, enable_store);
static DEVICE_ATTR(pm_qos, S_IRUGO | S_IWUSR,
pm_qos_show, pm_qos_store);
static DEVICE_ATTR(state, S_IRUGO, state_show, NULL);
static DEVICE_ATTR(remote_wakeup, S_IRUGO | S_IWUSR,
remote_wakeup_show, remote_wakeup_store);
static struct device_attribute *android_usb_attributes[] = {
&dev_attr_idVendor,
@ -1197,6 +1225,7 @@ static struct device_attribute *android_usb_attributes[] = {
&dev_attr_enable,
&dev_attr_pm_qos,
&dev_attr_state,
&dev_attr_remote_wakeup,
NULL
};