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usb: gadget: introduce gadget state tracking

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that's useful information to expose to userland.

Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Felipe Balbi 2011-12-19 12:57:04 +02:00
parent d1e3d757f7
commit 49401f4169
2 changed files with 32 additions and 0 deletions
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23
drivers/usb/gadget/udc-core.c
View File

@ -101,6 +101,16 @@ EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
/* ------------------------------------------------------------------------- */
void usb_gadget_set_state(struct usb_gadget *gadget,
enum usb_device_state state)
{
gadget->state = state;
sysfs_notify(&gadget->dev.kobj, NULL, "status");
}
EXPORT_SYMBOL_GPL(usb_gadget_set_state);
/* ------------------------------------------------------------------------- */
/**
* usb_gadget_udc_start - tells usb device controller to start up
* @gadget: The gadget we want to get started
@ -197,6 +207,8 @@ int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
if (ret)
goto err4;
usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED);
mutex_unlock(&udc_lock);
return 0;
@ -406,6 +418,16 @@ static ssize_t usb_udc_softconn_store(struct device *dev,
}
static DEVICE_ATTR(soft_connect, S_IWUSR, NULL, usb_udc_softconn_store);
static ssize_t usb_gadget_state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
struct usb_gadget *gadget = udc->gadget;
return sprintf(buf, "%s\n", usb_state_string(gadget->state));
}
static DEVICE_ATTR(state, S_IRUGO, usb_gadget_state_show, NULL);
#define USB_UDC_SPEED_ATTR(name, param) \
ssize_t usb_udc_##param##_show(struct device *dev, \
struct device_attribute *attr, char *buf) \
@ -439,6 +461,7 @@ static USB_UDC_ATTR(a_alt_hnp_support);
static struct attribute *usb_udc_attrs[] = {
&dev_attr_srp.attr,
&dev_attr_soft_connect.attr,
&dev_attr_state.attr,
&dev_attr_current_speed.attr,
&dev_attr_maximum_speed.attr,

9
include/linux/usb/gadget.h
View File

@ -482,6 +482,7 @@ struct usb_gadget_ops {
* @speed: Speed of current connection to USB host.
* @max_speed: Maximal speed the UDC can handle. UDC must support this
* and all slower speeds.
* @state: the state we are now (attached, suspended, configured, etc)
* @sg_supported: true if we can handle scatter-gather
* @is_otg: True if the USB device port uses a Mini-AB jack, so that the
* gadget driver must provide a USB OTG descriptor.
@ -525,6 +526,7 @@ struct usb_gadget {
struct list_head ep_list; /* of usb_ep */
enum usb_device_speed speed;
enum usb_device_speed max_speed;
enum usb_device_state state;
unsigned sg_supported:1;
unsigned is_otg:1;
unsigned is_a_peripheral:1;
@ -959,6 +961,13 @@ extern void usb_gadget_unmap_request(struct usb_gadget *gadget,
/*-------------------------------------------------------------------------*/
/* utility to set gadget state properly */
extern void usb_gadget_set_state(struct usb_gadget *gadget,
enum usb_device_state state);
/*-------------------------------------------------------------------------*/
/* utility wrapping a simple endpoint selection policy */
extern struct usb_ep *usb_ep_autoconfig(struct usb_gadget *,