diff options
Diffstat (limited to 'drivers/usb/core/sysfs.c')
| -rw-r--r-- | drivers/usb/core/sysfs.c | 162 |
1 files changed, 160 insertions, 2 deletions
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c index be37c863fdfb..2ab222be8fd1 100644 --- a/drivers/usb/core/sysfs.c +++ b/drivers/usb/core/sysfs.c @@ -169,6 +169,73 @@ show_quirks(struct device *dev, struct device_attribute *attr, char *buf) } static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL); + +#if defined(CONFIG_USB_PERSIST) || defined(CONFIG_USB_SUSPEND) +static const char power_group[] = "power"; +#endif + +#ifdef CONFIG_USB_PERSIST + +static ssize_t +show_persist(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct usb_device *udev = to_usb_device(dev); + + return sprintf(buf, "%d\n", udev->persist_enabled); +} + +static ssize_t +set_persist(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct usb_device *udev = to_usb_device(dev); + int value; + + /* Hubs are always enabled for USB_PERSIST */ + if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) + return -EPERM; + + if (sscanf(buf, "%d", &value) != 1) + return -EINVAL; + usb_pm_lock(udev); + udev->persist_enabled = !!value; + usb_pm_unlock(udev); + return count; +} + +static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist); + +static int add_persist_attributes(struct device *dev) +{ + int rc = 0; + + if (is_usb_device(dev)) { + struct usb_device *udev = to_usb_device(dev); + + /* Hubs are automatically enabled for USB_PERSIST */ + if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) + udev->persist_enabled = 1; + rc = sysfs_add_file_to_group(&dev->kobj, + &dev_attr_persist.attr, + power_group); + } + return rc; +} + +static void remove_persist_attributes(struct device *dev) +{ + sysfs_remove_file_from_group(&dev->kobj, + &dev_attr_persist.attr, + power_group); +} + +#else + +#define add_persist_attributes(dev) 0 +#define remove_persist_attributes(dev) do {} while (0) + +#endif /* CONFIG_USB_PERSIST */ + #ifdef CONFIG_USB_SUSPEND static ssize_t @@ -276,8 +343,6 @@ set_level(struct device *dev, struct device_attribute *attr, static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level); -static char power_group[] = "power"; - static int add_power_attributes(struct device *dev) { int rc = 0; @@ -311,6 +376,7 @@ static void remove_power_attributes(struct device *dev) #endif /* CONFIG_USB_SUSPEND */ + /* Descriptor fields */ #define usb_descriptor_attr_le16(field, format_string) \ static ssize_t \ @@ -375,6 +441,54 @@ static struct attribute_group dev_attr_grp = { .attrs = dev_attrs, }; +/* Binary descriptors */ + +static ssize_t +read_descriptors(struct kobject *kobj, struct bin_attribute *attr, + char *buf, loff_t off, size_t count) +{ + struct usb_device *udev = to_usb_device( + container_of(kobj, struct device, kobj)); + size_t nleft = count; + size_t srclen, n; + + usb_lock_device(udev); + + /* The binary attribute begins with the device descriptor */ + srclen = sizeof(struct usb_device_descriptor); + if (off < srclen) { + n = min_t(size_t, nleft, srclen - off); + memcpy(buf, off + (char *) &udev->descriptor, n); + nleft -= n; + buf += n; + off = 0; + } else { + off -= srclen; + } + + /* Then follows the raw descriptor entry for the current + * configuration (config plus subsidiary descriptors). + */ + if (udev->actconfig) { + int cfgno = udev->actconfig - udev->config; + + srclen = __le16_to_cpu(udev->actconfig->desc.wTotalLength); + if (off < srclen) { + n = min_t(size_t, nleft, srclen - off); + memcpy(buf, off + udev->rawdescriptors[cfgno], n); + nleft -= n; + } + } + usb_unlock_device(udev); + return count - nleft; +} + +static struct bin_attribute dev_bin_attr_descriptors = { + .attr = {.name = "descriptors", .mode = 0444}, + .read = read_descriptors, + .size = 18 + 65535, /* dev descr + max-size raw descriptor */ +}; + int usb_create_sysfs_dev_files(struct usb_device *udev) { struct device *dev = &udev->dev; @@ -384,6 +498,14 @@ int usb_create_sysfs_dev_files(struct usb_device *udev) if (retval) return retval; + retval = device_create_bin_file(dev, &dev_bin_attr_descriptors); + if (retval) + goto error; + + retval = add_persist_attributes(dev); + if (retval) + goto error; + retval = add_power_attributes(dev); if (retval) goto error; @@ -421,9 +543,30 @@ void usb_remove_sysfs_dev_files(struct usb_device *udev) device_remove_file(dev, &dev_attr_product); device_remove_file(dev, &dev_attr_serial); remove_power_attributes(dev); + remove_persist_attributes(dev); + device_remove_bin_file(dev, &dev_bin_attr_descriptors); sysfs_remove_group(&dev->kobj, &dev_attr_grp); } +/* Interface Accociation Descriptor fields */ +#define usb_intf_assoc_attr(field, format_string) \ +static ssize_t \ +show_iad_##field (struct device *dev, struct device_attribute *attr, \ + char *buf) \ +{ \ + struct usb_interface *intf = to_usb_interface (dev); \ + \ + return sprintf (buf, format_string, \ + intf->intf_assoc->field); \ +} \ +static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL); + +usb_intf_assoc_attr (bFirstInterface, "%02x\n") +usb_intf_assoc_attr (bInterfaceCount, "%02d\n") +usb_intf_assoc_attr (bFunctionClass, "%02x\n") +usb_intf_assoc_attr (bFunctionSubClass, "%02x\n") +usb_intf_assoc_attr (bFunctionProtocol, "%02x\n") + /* Interface fields */ #define usb_intf_attr(field, format_string) \ static ssize_t \ @@ -487,6 +630,18 @@ static ssize_t show_modalias(struct device *dev, } static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); +static struct attribute *intf_assoc_attrs[] = { + &dev_attr_iad_bFirstInterface.attr, + &dev_attr_iad_bInterfaceCount.attr, + &dev_attr_iad_bFunctionClass.attr, + &dev_attr_iad_bFunctionSubClass.attr, + &dev_attr_iad_bFunctionProtocol.attr, + NULL, +}; +static struct attribute_group intf_assoc_attr_grp = { + .attrs = intf_assoc_attrs, +}; + static struct attribute *intf_attrs[] = { &dev_attr_bInterfaceNumber.attr, &dev_attr_bAlternateSetting.attr, @@ -538,6 +693,8 @@ int usb_create_sysfs_intf_files(struct usb_interface *intf) alt->string = usb_cache_string(udev, alt->desc.iInterface); if (alt->string) retval = device_create_file(dev, &dev_attr_interface); + if (intf->intf_assoc) + retval = sysfs_create_group(&dev->kobj, &intf_assoc_attr_grp); usb_create_intf_ep_files(intf, udev); return 0; } @@ -549,4 +706,5 @@ void usb_remove_sysfs_intf_files(struct usb_interface *intf) usb_remove_intf_ep_files(intf); device_remove_file(dev, &dev_attr_interface); sysfs_remove_group(&dev->kobj, &intf_attr_grp); + sysfs_remove_group(&intf->dev.kobj, &intf_assoc_attr_grp); } |