drivers/usb/core/sysfs.c

   1 /*
   2  * drivers/usb/core/sysfs.c
   3  *
   4  * (C) Copyright 2002 David Brownell
   5  * (C) Copyright 2002,2004 Greg Kroah-Hartman
   6  * (C) Copyright 2002,2004 IBM Corp.
   7  *
   8  * All of the sysfs file attributes for usb devices and interfaces.
   9  *
  10  */
  11
  12
  13 #include <linux/config.h>
  14 #include <linux/kernel.h>
  15
  16 #ifdef CONFIG_USB_DEBUG
  17         #define DEBUG
  18 #else
  19         #undef DEBUG
  20 #endif
  21 #include <linux/usb.h>
  22
  23 #include "usb.h"
  24
  25 /* Active configuration fields */
  26 #define usb_actconfig_show(field, multiplier, format_string)            \
  27 static ssize_t  show_##field (struct device *dev, char *buf)            \
  28 {                                                                       \
  29         struct usb_device *udev;                                        \
  30         struct usb_host_config *actconfig;                              \
  31                                                                         \
  32         udev = to_usb_device (dev);                                     \
  33         actconfig = udev->actconfig;                                    \
  34         if (actconfig)                                                  \
  35                 return sprintf (buf, format_string,                     \
  36                                 actconfig->desc.field * multiplier);    \
  37         else                                                            \
  38                 return 0;                                               \
  39 }                                                                       \
  40
  41 #define usb_actconfig_attr(field, multiplier, format_string)            \
  42 usb_actconfig_show(field, multiplier, format_string)                    \
  43 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
  44
  45 usb_actconfig_attr (bNumInterfaces, 1, "%2d\n")
  46 usb_actconfig_attr (bmAttributes, 1, "%2x\n")
  47 usb_actconfig_attr (bMaxPower, 2, "%3dmA\n")
  48
  49 static ssize_t show_configuration_string(struct device *dev, char *buf)
  50 {
  51         struct usb_device *udev;
  52         struct usb_host_config *actconfig;
  53         int len;
  54
  55         udev = to_usb_device (dev);
  56         actconfig = udev->actconfig;
  57         if ((!actconfig) || (!actconfig->string))
  58                 return 0;
  59         len = sprintf(buf, actconfig->string, PAGE_SIZE);
  60         if (len < 0)
  61                 return 0;
  62         buf[len] = '\n';
  63         buf[len+1] = 0;
  64         return len+1;
  65 }
  66 static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL);
  67
  68 /* configuration value is always present, and r/w */
  69 usb_actconfig_show(bConfigurationValue, 1, "%u\n");
  70
  71 static ssize_t
  72 set_bConfigurationValue (struct device *dev, const char *buf, size_t count)
  73 {
  74         struct usb_device       *udev = udev = to_usb_device (dev);
  75         int                     config, value;
  76
  77         if (sscanf (buf, "%u", &config) != 1 || config > 255)
  78                 return -EINVAL;
  79         usb_lock_device(udev);
  80         value = usb_set_configuration (udev, config);
  81         usb_unlock_device(udev);
  82         return (value < 0) ? value : count;
  83 }
  84
  85 static DEVICE_ATTR(bConfigurationValue, S_IRUGO | S_IWUSR,
  86                 show_bConfigurationValue, set_bConfigurationValue);
  87
  88 /* String fields */
  89 #define usb_string_attr(name)                                           \
  90 static ssize_t  show_##name(struct device *dev, char *buf)              \
  91 {                                                                       \
  92         struct usb_device *udev;                                        \
  93         int len;                                                        \
  94                                                                         \
  95         udev = to_usb_device (dev);                                     \
  96         len = snprintf(buf, 256, "%s", udev->name);                     \
  97         if (len < 0)                                                    \
  98                 return 0;                                               \
  99         buf[len] = '\n';                                                \
 100         buf[len+1] = 0;                                                 \
 101         return len+1;                                                   \
 102 }                                                                       \
 103 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 104
 105 usb_string_attr(product);
 106 usb_string_attr(manufacturer);
 107 usb_string_attr(serial);
 108
 109 static ssize_t
 110 show_speed (struct device *dev, char *buf)
 111 {
 112         struct usb_device *udev;
 113         char *speed;
 114
 115         udev = to_usb_device (dev);
 116
 117         switch (udev->speed) {
 118         case USB_SPEED_LOW:
 119                 speed = "1.5";
 120                 break;
 121         case USB_SPEED_UNKNOWN:
 122         case USB_SPEED_FULL:
 123                 speed = "12";
 124                 break;
 125         case USB_SPEED_HIGH:
 126                 speed = "480";
 127                 break;
 128         default:
 129                 speed = "unknown";
 130         }
 131         return sprintf (buf, "%s\n", speed);
 132 }
 133 static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL);
 134
 135 static ssize_t
 136 show_devnum (struct device *dev, char *buf)
 137 {
 138         struct usb_device *udev;
 139
 140         udev = to_usb_device (dev);
 141         return sprintf (buf, "%d\n", udev->devnum);
 142 }
 143 static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL);
 144
 145 static ssize_t
 146 show_version (struct device *dev, char *buf)
 147 {
 148         struct usb_device *udev;
 149         u16 bcdUSB;
 150
 151         udev = to_usb_device(dev);
 152         bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
 153         return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
 154 }
 155 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
 156
 157 static ssize_t
 158 show_maxchild (struct device *dev, char *buf)
 159 {
 160         struct usb_device *udev;
 161
 162         udev = to_usb_device (dev);
 163         return sprintf (buf, "%d\n", udev->maxchild);
 164 }
 165 static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL);
 166
 167 /* Descriptor fields */
 168 #define usb_descriptor_attr_le16(field, format_string)                  \
 169 static ssize_t                                                          \
 170 show_##field (struct device *dev, char *buf)                            \
 171 {                                                                       \
 172         struct usb_device *udev;                                        \
 173                                                                         \
 174         udev = to_usb_device (dev);                                     \
 175         return sprintf (buf, format_string,                             \
 176                         le16_to_cpu(udev->descriptor.field));           \
 177 }                                                                       \
 178 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 179
 180 usb_descriptor_attr_le16(idVendor, "%04x\n")
 181 usb_descriptor_attr_le16(idProduct, "%04x\n")
 182 usb_descriptor_attr_le16(bcdDevice, "%04x\n")
 183
 184 #define usb_descriptor_attr(field, format_string)                       \
 185 static ssize_t                                                          \
 186 show_##field (struct device *dev, char *buf)                            \
 187 {                                                                       \
 188         struct usb_device *udev;                                        \
 189                                                                         \
 190         udev = to_usb_device (dev);                                     \
 191         return sprintf (buf, format_string, udev->descriptor.field);    \
 192 }                                                                       \
 193 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 194
 195 usb_descriptor_attr (bDeviceClass, "%02x\n")
 196 usb_descriptor_attr (bDeviceSubClass, "%02x\n")
 197 usb_descriptor_attr (bDeviceProtocol, "%02x\n")
 198 usb_descriptor_attr (bNumConfigurations, "%d\n")
 199
 200 static struct attribute *dev_attrs[] = {
 201         /* current configuration's attributes */
 202         &dev_attr_bNumInterfaces.attr,
 203         &dev_attr_bConfigurationValue.attr,
 204         &dev_attr_bmAttributes.attr,
 205         &dev_attr_bMaxPower.attr,
 206         /* device attributes */
 207         &dev_attr_idVendor.attr,
 208         &dev_attr_idProduct.attr,
 209         &dev_attr_bcdDevice.attr,
 210         &dev_attr_bDeviceClass.attr,
 211         &dev_attr_bDeviceSubClass.attr,
 212         &dev_attr_bDeviceProtocol.attr,
 213         &dev_attr_bNumConfigurations.attr,
 214         &dev_attr_speed.attr,
 215         &dev_attr_devnum.attr,
 216         &dev_attr_version.attr,
 217         &dev_attr_maxchild.attr,
 218         NULL,
 219 };
 220 static struct attribute_group dev_attr_grp = {
 221         .attrs = dev_attrs,
 222 };
 223
 224 void usb_create_sysfs_dev_files (struct usb_device *udev)
 225 {
 226         struct device *dev = &udev->dev;
 227
 228         sysfs_create_group(&dev->kobj, &dev_attr_grp);
 229
 230         if (udev->manufacturer)
 231                 device_create_file (dev, &dev_attr_manufacturer);
 232         if (udev->product)
 233                 device_create_file (dev, &dev_attr_product);
 234         if (udev->serial)
 235                 device_create_file (dev, &dev_attr_serial);
 236         device_create_file (dev, &dev_attr_configuration);
 237 }
 238
 239 void usb_remove_sysfs_dev_files (struct usb_device *udev)
 240 {
 241         struct device *dev = &udev->dev;
 242
 243         sysfs_remove_group(&dev->kobj, &dev_attr_grp);
 244
 245         if (udev->descriptor.iManufacturer)
 246                 device_remove_file(dev, &dev_attr_manufacturer);
 247         if (udev->descriptor.iProduct)
 248                 device_remove_file(dev, &dev_attr_product);
 249         if (udev->descriptor.iSerialNumber)
 250                 device_remove_file(dev, &dev_attr_serial);
 251         device_remove_file (dev, &dev_attr_configuration);
 252 }
 253
 254 /* Interface fields */
 255 #define usb_intf_attr(field, format_string)                             \
 256 static ssize_t                                                          \
 257 show_##field (struct device *dev, char *buf)                            \
 258 {                                                                       \
 259         struct usb_interface *intf = to_usb_interface (dev);            \
 260                                                                         \
 261         return sprintf (buf, format_string, intf->cur_altsetting->desc.field); \
 262 }                                                                       \
 263 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
 264
 265 usb_intf_attr (bInterfaceNumber, "%02x\n")
 266 usb_intf_attr (bAlternateSetting, "%2d\n")
 267 usb_intf_attr (bNumEndpoints, "%02x\n")
 268 usb_intf_attr (bInterfaceClass, "%02x\n")
 269 usb_intf_attr (bInterfaceSubClass, "%02x\n")
 270 usb_intf_attr (bInterfaceProtocol, "%02x\n")
 271
 272 static ssize_t show_interface_string(struct device *dev, char *buf)
 273 {
 274         struct usb_interface *intf;
 275         struct usb_device *udev;
 276         int len;
 277
 278         intf = to_usb_interface (dev);
 279         udev = interface_to_usbdev (intf);
 280         len = snprintf(buf, 256, "%s", intf->cur_altsetting->string);
 281         if (len < 0)
 282                 return 0;
 283         buf[len] = '\n';
 284         buf[len+1] = 0;
 285         return len+1;
 286 }
 287 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
 288
 289 static struct attribute *intf_attrs[] = {
 290         &dev_attr_bInterfaceNumber.attr,
 291         &dev_attr_bAlternateSetting.attr,
 292         &dev_attr_bNumEndpoints.attr,
 293         &dev_attr_bInterfaceClass.attr,
 294         &dev_attr_bInterfaceSubClass.attr,
 295         &dev_attr_bInterfaceProtocol.attr,
 296         NULL,
 297 };
 298 static struct attribute_group intf_attr_grp = {
 299         .attrs = intf_attrs,
 300 };
 301
 302 void usb_create_sysfs_intf_files (struct usb_interface *intf)
 303 {
 304         sysfs_create_group(&intf->dev.kobj, &intf_attr_grp);
 305
 306         if (intf->cur_altsetting->string)
 307                 device_create_file(&intf->dev, &dev_attr_interface);
 308
 309 }
 310
 311 void usb_remove_sysfs_intf_files (struct usb_interface *intf)
 312 {
 313         sysfs_remove_group(&intf->dev.kobj, &intf_attr_grp);
 314
 315         if (intf->cur_altsetting->string)
 316                 device_remove_file(&intf->dev, &dev_attr_interface);
 317
 318 }