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[usb] Expose usb_find_driver() 

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/41/head
Michael Brown 2015-09-05 15:53:56 +01:00
parent 3376fa520b
commit 866e525814
2 changed files with 56 additions and 42 deletions
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93
src/drivers/bus/usb.c
View File

@ -972,22 +972,40 @@ static int usb_function ( struct usb_function *func,
}
/**
* Check for a USB device ID match
* Find USB device driver
*
* @v func USB function
* @v id Device ID
* @ret matches Device ID matches
* @v vendor Vendor ID
* @v product Product ID
* @v class Class
* @ret id USB device ID, or NULL
* @ret driver USB device driver, or NULL
*/
static int
usb_device_id_matches ( struct usb_function *func, struct usb_device_id *id ) {
struct usb_driver * usb_find_driver ( unsigned int vendor, unsigned int product,
struct usb_class *class,
struct usb_device_id **id ) {
struct usb_driver *driver;
unsigned int i;
return ( ( ( id->vendor == func->dev.desc.vendor ) ||
( id->vendor == USB_ANY_ID ) ) &&
( ( id->product == func->dev.desc.device ) ||
( id->product == USB_ANY_ID ) ) &&
( id->class.class == func->class.class ) &&
( id->class.subclass == func->class.subclass ) &&
( id->class.protocol == func->class.protocol ) );
/* Look for a matching driver */
for_each_table_entry ( driver, USB_DRIVERS ) {
for ( i = 0 ; i < driver->id_count ; i++ ) {
/* Check for a matching ID */
*id = &driver->ids[i];
if ( ( ( (*id)->vendor == vendor ) ||
( (*id)->vendor == USB_ANY_ID ) ) &&
( ( (*id)->product == product ) ||
( (*id)->product == USB_ANY_ID ) ) &&
( (*id)->class.class == class->class ) &&
( (*id)->class.subclass == class->subclass ) &&
( (*id)->class.protocol == class->protocol ) )
return driver;
}
}
/* Not found */
*id = NULL;
return NULL;
}
/**
@ -1002,39 +1020,30 @@ static int usb_probe ( struct usb_function *func,
struct usb_device *usb = func->usb;
struct usb_driver *driver;
struct usb_device_id *id;
unsigned int i;
int rc;
/* Look for a matching driver */
for_each_table_entry ( driver, USB_DRIVERS ) {
for ( i = 0 ; i < driver->id_count ; i++ ) {
/* Check for a matching ID */
id = &driver->ids[i];
if ( ! usb_device_id_matches ( func, id ) )
continue;
/* Probe driver */
if ( ( rc = driver->probe ( func, config ) ) != 0 ) {
DBGC ( usb, "USB %s failed to probe driver %s: "
"%s\n", func->name, id->name,
strerror ( rc ) );
/* Continue trying other drivers */
continue;
}
/* Record driver */
func->driver = driver;
func->dev.driver_name = id->name;
return 0;
}
/* Identify driver */
driver = usb_find_driver ( func->dev.desc.vendor, func->dev.desc.device,
&func->class, &id );
if ( ! driver ) {
DBGC ( usb, "USB %s %04x:%04x class %d:%d:%d has no driver\n",
func->name, func->dev.desc.vendor, func->dev.desc.device,
func->class.class, func->class.subclass,
func->class.protocol );
return -ENOENT;
}
/* No driver found */
DBGC ( usb, "USB %s %04x:%04x class %d:%d:%d has no driver\n",
func->name, func->dev.desc.vendor, func->dev.desc.device,
func->class.class, func->class.subclass, func->class.protocol );
return -ENOENT;
/* Probe driver */
if ( ( rc = driver->probe ( func, config ) ) != 0 ) {
DBGC ( usb, "USB %s failed to probe driver %s: %s\n",
func->name, id->name, strerror ( rc ) );
return rc;
}
/* Record driver */
func->driver = driver;
func->dev.driver_name = id->name;
return 0;
}
/**

5
src/include/ipxe/usb.h
View File

@ -1316,4 +1316,9 @@ struct usb_driver {
/** Declare a USB driver */
#define __usb_driver __table_entry ( USB_DRIVERS, 01 )
extern struct usb_driver * usb_find_driver ( unsigned int vendor,
unsigned int product,
struct usb_class *class,
struct usb_device_id **id );
#endif /* _IPXE_USB_H */