linux/drivers/usb/core/sysfs.c
Alan Stern 4f62efe67f [PATCH] usbcore: Fix handling of sysfs strings and other attributes
This patch (as592) makes a few small improvements to the way device
strings are handled, and it fixes some bugs in a couple of other sysfs
attribute routines.  (Look at show_configuration_string() to see what I
mean.)

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-10-28 16:47:51 -07:00

569 lines
15 KiB
C

/*
* drivers/usb/core/sysfs.c
*
* (C) Copyright 2002 David Brownell
* (C) Copyright 2002,2004 Greg Kroah-Hartman
* (C) Copyright 2002,2004 IBM Corp.
*
* All of the sysfs file attributes for usb devices and interfaces.
*
*/
#include <linux/config.h>
#include <linux/kernel.h>
#ifdef CONFIG_USB_DEBUG
#define DEBUG
#else
#undef DEBUG
#endif
#include <linux/usb.h>
#include "usb.h"
/* endpoint stuff */
struct ep_object {
struct usb_endpoint_descriptor *desc;
struct usb_device *udev;
struct kobject kobj;
};
#define to_ep_object(_kobj) \
container_of(_kobj, struct ep_object, kobj)
struct ep_attribute {
struct attribute attr;
ssize_t (*show)(struct usb_device *,
struct usb_endpoint_descriptor *, char *);
};
#define to_ep_attribute(_attr) \
container_of(_attr, struct ep_attribute, attr)
#define EP_ATTR(_name) \
struct ep_attribute ep_##_name = { \
.attr = {.name = #_name, .owner = THIS_MODULE, \
.mode = S_IRUGO}, \
.show = show_ep_##_name}
#define usb_ep_attr(field, format_string) \
static ssize_t show_ep_##field(struct usb_device *udev, \
struct usb_endpoint_descriptor *desc, \
char *buf) \
{ \
return sprintf(buf, format_string, desc->field); \
} \
static EP_ATTR(field);
usb_ep_attr(bLength, "%02x\n")
usb_ep_attr(bEndpointAddress, "%02x\n")
usb_ep_attr(bmAttributes, "%02x\n")
usb_ep_attr(bInterval, "%02x\n")
static ssize_t show_ep_wMaxPacketSize(struct usb_device *udev,
struct usb_endpoint_descriptor *desc, char *buf)
{
return sprintf(buf, "%04x\n",
le16_to_cpu(desc->wMaxPacketSize) & 0x07ff);
}
static EP_ATTR(wMaxPacketSize);
static ssize_t show_ep_type(struct usb_device *udev,
struct usb_endpoint_descriptor *desc, char *buf)
{
char *type = "unknown";
switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
case USB_ENDPOINT_XFER_CONTROL:
type = "Control";
break;
case USB_ENDPOINT_XFER_ISOC:
type = "Isoc";
break;
case USB_ENDPOINT_XFER_BULK:
type = "Bulk";
break;
case USB_ENDPOINT_XFER_INT:
type = "Interrupt";
break;
}
return sprintf(buf, "%s\n", type);
}
static EP_ATTR(type);
static ssize_t show_ep_interval(struct usb_device *udev,
struct usb_endpoint_descriptor *desc, char *buf)
{
char unit;
unsigned interval = 0;
unsigned in;
in = (desc->bEndpointAddress & USB_DIR_IN);
switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
case USB_ENDPOINT_XFER_CONTROL:
if (udev->speed == USB_SPEED_HIGH) /* uframes per NAK */
interval = desc->bInterval;
break;
case USB_ENDPOINT_XFER_ISOC:
interval = 1 << (desc->bInterval - 1);
break;
case USB_ENDPOINT_XFER_BULK:
if (udev->speed == USB_SPEED_HIGH && !in) /* uframes per NAK */
interval = desc->bInterval;
break;
case USB_ENDPOINT_XFER_INT:
if (udev->speed == USB_SPEED_HIGH)
interval = 1 << (desc->bInterval - 1);
else
interval = desc->bInterval;
break;
}
interval *= (udev->speed == USB_SPEED_HIGH) ? 125 : 1000;
if (interval % 1000)
unit = 'u';
else {
unit = 'm';
interval /= 1000;
}
return sprintf(buf, "%d%cs\n", interval, unit);
}
static EP_ATTR(interval);
static ssize_t show_ep_direction(struct usb_device *udev,
struct usb_endpoint_descriptor *desc, char *buf)
{
char *direction;
if ((desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
USB_ENDPOINT_XFER_CONTROL)
direction = "both";
else if (desc->bEndpointAddress & USB_DIR_IN)
direction = "in";
else
direction = "out";
return sprintf(buf, "%s\n", direction);
}
static EP_ATTR(direction);
static struct attribute *ep_attrs[] = {
&ep_bLength.attr,
&ep_bEndpointAddress.attr,
&ep_bmAttributes.attr,
&ep_bInterval.attr,
&ep_wMaxPacketSize.attr,
&ep_type.attr,
&ep_interval.attr,
&ep_direction.attr,
NULL,
};
static void ep_object_release(struct kobject *kobj)
{
kfree(to_ep_object(kobj));
}
static ssize_t ep_object_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
struct ep_object *ep_obj = to_ep_object(kobj);
struct ep_attribute *ep_attr = to_ep_attribute(attr);
return (ep_attr->show)(ep_obj->udev, ep_obj->desc, buf);
}
static struct sysfs_ops ep_object_sysfs_ops = {
.show = ep_object_show,
};
static struct kobj_type ep_object_ktype = {
.release = ep_object_release,
.sysfs_ops = &ep_object_sysfs_ops,
.default_attrs = ep_attrs,
};
static void usb_create_ep_files(struct kobject *parent,
struct usb_host_endpoint *endpoint,
struct usb_device *udev)
{
struct ep_object *ep_obj;
struct kobject *kobj;
ep_obj = kzalloc(sizeof(struct ep_object), GFP_KERNEL);
if (!ep_obj)
return;
ep_obj->desc = &endpoint->desc;
ep_obj->udev = udev;
kobj = &ep_obj->kobj;
kobject_set_name(kobj, "ep_%02x", endpoint->desc.bEndpointAddress);
kobj->parent = parent;
kobj->ktype = &ep_object_ktype;
/* Don't use kobject_register, because it generates a hotplug event */
kobject_init(kobj);
if (kobject_add(kobj) == 0)
endpoint->kobj = kobj;
else
kobject_put(kobj);
}
static void usb_remove_ep_files(struct usb_host_endpoint *endpoint)
{
if (endpoint->kobj) {
kobject_del(endpoint->kobj);
kobject_put(endpoint->kobj);
endpoint->kobj = NULL;
}
}
/* Active configuration fields */
#define usb_actconfig_show(field, multiplier, format_string) \
static ssize_t show_##field (struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct usb_device *udev; \
struct usb_host_config *actconfig; \
\
udev = to_usb_device (dev); \
actconfig = udev->actconfig; \
if (actconfig) \
return sprintf (buf, format_string, \
actconfig->desc.field * multiplier); \
else \
return 0; \
} \
#define usb_actconfig_attr(field, multiplier, format_string) \
usb_actconfig_show(field, multiplier, format_string) \
static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
usb_actconfig_attr (bNumInterfaces, 1, "%2d\n")
usb_actconfig_attr (bmAttributes, 1, "%2x\n")
usb_actconfig_attr (bMaxPower, 2, "%3dmA\n")
static ssize_t show_configuration_string(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct usb_device *udev;
struct usb_host_config *actconfig;
udev = to_usb_device (dev);
actconfig = udev->actconfig;
if ((!actconfig) || (!actconfig->string))
return 0;
return sprintf(buf, "%s\n", actconfig->string);
}
static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL);
/* configuration value is always present, and r/w */
usb_actconfig_show(bConfigurationValue, 1, "%u\n");
static ssize_t
set_bConfigurationValue (struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct usb_device *udev = udev = to_usb_device (dev);
int config, value;
if (sscanf (buf, "%u", &config) != 1 || config > 255)
return -EINVAL;
usb_lock_device(udev);
value = usb_set_configuration (udev, config);
usb_unlock_device(udev);
return (value < 0) ? value : count;
}
static DEVICE_ATTR(bConfigurationValue, S_IRUGO | S_IWUSR,
show_bConfigurationValue, set_bConfigurationValue);
/* String fields */
#define usb_string_attr(name) \
static ssize_t show_##name(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct usb_device *udev; \
\
udev = to_usb_device (dev); \
return sprintf(buf, "%s\n", udev->name); \
} \
static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
usb_string_attr(product);
usb_string_attr(manufacturer);
usb_string_attr(serial);
static ssize_t
show_speed (struct device *dev, struct device_attribute *attr, char *buf)
{
struct usb_device *udev;
char *speed;
udev = to_usb_device (dev);
switch (udev->speed) {
case USB_SPEED_LOW:
speed = "1.5";
break;
case USB_SPEED_UNKNOWN:
case USB_SPEED_FULL:
speed = "12";
break;
case USB_SPEED_HIGH:
speed = "480";
break;
default:
speed = "unknown";
}
return sprintf (buf, "%s\n", speed);
}
static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL);
static ssize_t
show_devnum (struct device *dev, struct device_attribute *attr, char *buf)
{
struct usb_device *udev;
udev = to_usb_device (dev);
return sprintf (buf, "%d\n", udev->devnum);
}
static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL);
static ssize_t
show_version (struct device *dev, struct device_attribute *attr, char *buf)
{
struct usb_device *udev;
u16 bcdUSB;
udev = to_usb_device(dev);
bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
}
static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
static ssize_t
show_maxchild (struct device *dev, struct device_attribute *attr, char *buf)
{
struct usb_device *udev;
udev = to_usb_device (dev);
return sprintf (buf, "%d\n", udev->maxchild);
}
static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL);
/* Descriptor fields */
#define usb_descriptor_attr_le16(field, format_string) \
static ssize_t \
show_##field (struct device *dev, struct device_attribute *attr, \
char *buf) \
{ \
struct usb_device *udev; \
\
udev = to_usb_device (dev); \
return sprintf (buf, format_string, \
le16_to_cpu(udev->descriptor.field)); \
} \
static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
usb_descriptor_attr_le16(idVendor, "%04x\n")
usb_descriptor_attr_le16(idProduct, "%04x\n")
usb_descriptor_attr_le16(bcdDevice, "%04x\n")
#define usb_descriptor_attr(field, format_string) \
static ssize_t \
show_##field (struct device *dev, struct device_attribute *attr, \
char *buf) \
{ \
struct usb_device *udev; \
\
udev = to_usb_device (dev); \
return sprintf (buf, format_string, udev->descriptor.field); \
} \
static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
usb_descriptor_attr (bDeviceClass, "%02x\n")
usb_descriptor_attr (bDeviceSubClass, "%02x\n")
usb_descriptor_attr (bDeviceProtocol, "%02x\n")
usb_descriptor_attr (bNumConfigurations, "%d\n")
usb_descriptor_attr (bMaxPacketSize0, "%d\n")
static struct attribute *dev_attrs[] = {
/* current configuration's attributes */
&dev_attr_bNumInterfaces.attr,
&dev_attr_bConfigurationValue.attr,
&dev_attr_bmAttributes.attr,
&dev_attr_bMaxPower.attr,
/* device attributes */
&dev_attr_idVendor.attr,
&dev_attr_idProduct.attr,
&dev_attr_bcdDevice.attr,
&dev_attr_bDeviceClass.attr,
&dev_attr_bDeviceSubClass.attr,
&dev_attr_bDeviceProtocol.attr,
&dev_attr_bNumConfigurations.attr,
&dev_attr_bMaxPacketSize0.attr,
&dev_attr_speed.attr,
&dev_attr_devnum.attr,
&dev_attr_version.attr,
&dev_attr_maxchild.attr,
NULL,
};
static struct attribute_group dev_attr_grp = {
.attrs = dev_attrs,
};
void usb_create_sysfs_dev_files (struct usb_device *udev)
{
struct device *dev = &udev->dev;
sysfs_create_group(&dev->kobj, &dev_attr_grp);
if (udev->manufacturer)
device_create_file (dev, &dev_attr_manufacturer);
if (udev->product)
device_create_file (dev, &dev_attr_product);
if (udev->serial)
device_create_file (dev, &dev_attr_serial);
device_create_file (dev, &dev_attr_configuration);
usb_create_ep_files(&dev->kobj, &udev->ep0, udev);
}
void usb_remove_sysfs_dev_files (struct usb_device *udev)
{
struct device *dev = &udev->dev;
usb_remove_ep_files(&udev->ep0);
sysfs_remove_group(&dev->kobj, &dev_attr_grp);
if (udev->manufacturer)
device_remove_file(dev, &dev_attr_manufacturer);
if (udev->product)
device_remove_file(dev, &dev_attr_product);
if (udev->serial)
device_remove_file(dev, &dev_attr_serial);
device_remove_file (dev, &dev_attr_configuration);
}
/* Interface fields */
#define usb_intf_attr(field, format_string) \
static ssize_t \
show_##field (struct device *dev, struct device_attribute *attr, \
char *buf) \
{ \
struct usb_interface *intf = to_usb_interface (dev); \
\
return sprintf (buf, format_string, \
intf->cur_altsetting->desc.field); \
} \
static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
usb_intf_attr (bInterfaceNumber, "%02x\n")
usb_intf_attr (bAlternateSetting, "%2d\n")
usb_intf_attr (bNumEndpoints, "%02x\n")
usb_intf_attr (bInterfaceClass, "%02x\n")
usb_intf_attr (bInterfaceSubClass, "%02x\n")
usb_intf_attr (bInterfaceProtocol, "%02x\n")
static ssize_t show_interface_string(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct usb_interface *intf;
struct usb_device *udev;
int len;
intf = to_usb_interface (dev);
udev = interface_to_usbdev (intf);
len = snprintf(buf, 256, "%s", intf->cur_altsetting->string);
if (len < 0)
return 0;
buf[len] = '\n';
buf[len+1] = 0;
return len+1;
}
static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
static ssize_t show_modalias(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct usb_interface *intf;
struct usb_device *udev;
struct usb_host_interface *alt;
intf = to_usb_interface(dev);
udev = interface_to_usbdev(intf);
alt = intf->cur_altsetting;
return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
"ic%02Xisc%02Xip%02X\n",
le16_to_cpu(udev->descriptor.idVendor),
le16_to_cpu(udev->descriptor.idProduct),
le16_to_cpu(udev->descriptor.bcdDevice),
udev->descriptor.bDeviceClass,
udev->descriptor.bDeviceSubClass,
udev->descriptor.bDeviceProtocol,
alt->desc.bInterfaceClass,
alt->desc.bInterfaceSubClass,
alt->desc.bInterfaceProtocol);
}
static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
static struct attribute *intf_attrs[] = {
&dev_attr_bInterfaceNumber.attr,
&dev_attr_bAlternateSetting.attr,
&dev_attr_bNumEndpoints.attr,
&dev_attr_bInterfaceClass.attr,
&dev_attr_bInterfaceSubClass.attr,
&dev_attr_bInterfaceProtocol.attr,
&dev_attr_modalias.attr,
NULL,
};
static struct attribute_group intf_attr_grp = {
.attrs = intf_attrs,
};
static inline void usb_create_intf_ep_files(struct usb_interface *intf,
struct usb_device *udev)
{
struct usb_host_interface *iface_desc;
int i;
iface_desc = intf->cur_altsetting;
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
usb_create_ep_files(&intf->dev.kobj, &iface_desc->endpoint[i],
udev);
}
static inline void usb_remove_intf_ep_files(struct usb_interface *intf)
{
struct usb_host_interface *iface_desc;
int i;
iface_desc = intf->cur_altsetting;
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
usb_remove_ep_files(&iface_desc->endpoint[i]);
}
void usb_create_sysfs_intf_files (struct usb_interface *intf)
{
struct usb_device *udev = interface_to_usbdev(intf);
struct usb_host_interface *alt = intf->cur_altsetting;
sysfs_create_group(&intf->dev.kobj, &intf_attr_grp);
if (alt->string == NULL)
alt->string = usb_cache_string(udev, alt->desc.iInterface);
if (alt->string)
device_create_file(&intf->dev, &dev_attr_interface);
usb_create_intf_ep_files(intf, udev);
}
void usb_remove_sysfs_intf_files (struct usb_interface *intf)
{
usb_remove_intf_ep_files(intf);
sysfs_remove_group(&intf->dev.kobj, &intf_attr_grp);
if (intf->cur_altsetting->string)
device_remove_file(&intf->dev, &dev_attr_interface);
}