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 #include <linux/usb.h> 16 #include "usb.h" 17 18 /* Active configuration fields */ 19 #define usb_actconfig_show(field, multiplier, format_string) \ 20 static ssize_t show_##field (struct device *dev, \ 21 struct device_attribute *attr, char *buf) \ 22 { \ 23 struct usb_device *udev; \ 24 struct usb_host_config *actconfig; \ 25 \ 26 udev = to_usb_device (dev); \ 27 actconfig = udev->actconfig; \ 28 if (actconfig) \ 29 return sprintf (buf, format_string, \ 30 actconfig->desc.field * multiplier); \ 31 else \ 32 return 0; \ 33 } \ 34 35 #define usb_actconfig_attr(field, multiplier, format_string) \ 36 usb_actconfig_show(field, multiplier, format_string) \ 37 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 38 39 usb_actconfig_attr (bNumInterfaces, 1, "%2d\n") 40 usb_actconfig_attr (bmAttributes, 1, "%2x\n") 41 usb_actconfig_attr (bMaxPower, 2, "%3dmA\n") 42 43 static ssize_t show_configuration_string(struct device *dev, 44 struct device_attribute *attr, char *buf) 45 { 46 struct usb_device *udev; 47 struct usb_host_config *actconfig; 48 49 udev = to_usb_device (dev); 50 actconfig = udev->actconfig; 51 if ((!actconfig) || (!actconfig->string)) 52 return 0; 53 return sprintf(buf, "%s\n", actconfig->string); 54 } 55 static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL); 56 57 /* configuration value is always present, and r/w */ 58 usb_actconfig_show(bConfigurationValue, 1, "%u\n"); 59 60 static ssize_t 61 set_bConfigurationValue (struct device *dev, struct device_attribute *attr, 62 const char *buf, size_t count) 63 { 64 struct usb_device *udev = udev = to_usb_device (dev); 65 int config, value; 66 67 if (sscanf (buf, "%u", &config) != 1 || config > 255) 68 return -EINVAL; 69 usb_lock_device(udev); 70 value = usb_set_configuration (udev, config); 71 usb_unlock_device(udev); 72 return (value < 0) ? value : count; 73 } 74 75 static DEVICE_ATTR(bConfigurationValue, S_IRUGO | S_IWUSR, 76 show_bConfigurationValue, set_bConfigurationValue); 77 78 /* String fields */ 79 #define usb_string_attr(name) \ 80 static ssize_t show_##name(struct device *dev, \ 81 struct device_attribute *attr, char *buf) \ 82 { \ 83 struct usb_device *udev; \ 84 \ 85 udev = to_usb_device (dev); \ 86 return sprintf(buf, "%s\n", udev->name); \ 87 } \ 88 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); 89 90 usb_string_attr(product); 91 usb_string_attr(manufacturer); 92 usb_string_attr(serial); 93 94 static ssize_t 95 show_speed (struct device *dev, struct device_attribute *attr, char *buf) 96 { 97 struct usb_device *udev; 98 char *speed; 99 100 udev = to_usb_device (dev); 101 102 switch (udev->speed) { 103 case USB_SPEED_LOW: 104 speed = "1.5"; 105 break; 106 case USB_SPEED_UNKNOWN: 107 case USB_SPEED_FULL: 108 speed = "12"; 109 break; 110 case USB_SPEED_HIGH: 111 speed = "480"; 112 break; 113 default: 114 speed = "unknown"; 115 } 116 return sprintf (buf, "%s\n", speed); 117 } 118 static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL); 119 120 static ssize_t 121 show_devnum (struct device *dev, struct device_attribute *attr, char *buf) 122 { 123 struct usb_device *udev; 124 125 udev = to_usb_device (dev); 126 return sprintf (buf, "%d\n", udev->devnum); 127 } 128 static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL); 129 130 static ssize_t 131 show_version (struct device *dev, struct device_attribute *attr, char *buf) 132 { 133 struct usb_device *udev; 134 u16 bcdUSB; 135 136 udev = to_usb_device(dev); 137 bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB); 138 return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff); 139 } 140 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); 141 142 static ssize_t 143 show_maxchild (struct device *dev, struct device_attribute *attr, char *buf) 144 { 145 struct usb_device *udev; 146 147 udev = to_usb_device (dev); 148 return sprintf (buf, "%d\n", udev->maxchild); 149 } 150 static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL); 151 152 /* Descriptor fields */ 153 #define usb_descriptor_attr_le16(field, format_string) \ 154 static ssize_t \ 155 show_##field (struct device *dev, struct device_attribute *attr, \ 156 char *buf) \ 157 { \ 158 struct usb_device *udev; \ 159 \ 160 udev = to_usb_device (dev); \ 161 return sprintf (buf, format_string, \ 162 le16_to_cpu(udev->descriptor.field)); \ 163 } \ 164 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 165 166 usb_descriptor_attr_le16(idVendor, "%04x\n") 167 usb_descriptor_attr_le16(idProduct, "%04x\n") 168 usb_descriptor_attr_le16(bcdDevice, "%04x\n") 169 170 #define usb_descriptor_attr(field, format_string) \ 171 static ssize_t \ 172 show_##field (struct device *dev, struct device_attribute *attr, \ 173 char *buf) \ 174 { \ 175 struct usb_device *udev; \ 176 \ 177 udev = to_usb_device (dev); \ 178 return sprintf (buf, format_string, udev->descriptor.field); \ 179 } \ 180 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 181 182 usb_descriptor_attr (bDeviceClass, "%02x\n") 183 usb_descriptor_attr (bDeviceSubClass, "%02x\n") 184 usb_descriptor_attr (bDeviceProtocol, "%02x\n") 185 usb_descriptor_attr (bNumConfigurations, "%d\n") 186 usb_descriptor_attr (bMaxPacketSize0, "%d\n") 187 188 static struct attribute *dev_attrs[] = { 189 /* current configuration's attributes */ 190 &dev_attr_bNumInterfaces.attr, 191 &dev_attr_bConfigurationValue.attr, 192 &dev_attr_bmAttributes.attr, 193 &dev_attr_bMaxPower.attr, 194 /* device attributes */ 195 &dev_attr_idVendor.attr, 196 &dev_attr_idProduct.attr, 197 &dev_attr_bcdDevice.attr, 198 &dev_attr_bDeviceClass.attr, 199 &dev_attr_bDeviceSubClass.attr, 200 &dev_attr_bDeviceProtocol.attr, 201 &dev_attr_bNumConfigurations.attr, 202 &dev_attr_bMaxPacketSize0.attr, 203 &dev_attr_speed.attr, 204 &dev_attr_devnum.attr, 205 &dev_attr_version.attr, 206 &dev_attr_maxchild.attr, 207 NULL, 208 }; 209 static struct attribute_group dev_attr_grp = { 210 .attrs = dev_attrs, 211 }; 212 213 void usb_create_sysfs_dev_files (struct usb_device *udev) 214 { 215 struct device *dev = &udev->dev; 216 217 sysfs_create_group(&dev->kobj, &dev_attr_grp); 218 219 if (udev->manufacturer) 220 device_create_file (dev, &dev_attr_manufacturer); 221 if (udev->product) 222 device_create_file (dev, &dev_attr_product); 223 if (udev->serial) 224 device_create_file (dev, &dev_attr_serial); 225 device_create_file (dev, &dev_attr_configuration); 226 usb_create_ep_files(dev, &udev->ep0, udev); 227 } 228 229 void usb_remove_sysfs_dev_files (struct usb_device *udev) 230 { 231 struct device *dev = &udev->dev; 232 233 usb_remove_ep_files(&udev->ep0); 234 sysfs_remove_group(&dev->kobj, &dev_attr_grp); 235 236 if (udev->manufacturer) 237 device_remove_file(dev, &dev_attr_manufacturer); 238 if (udev->product) 239 device_remove_file(dev, &dev_attr_product); 240 if (udev->serial) 241 device_remove_file(dev, &dev_attr_serial); 242 device_remove_file (dev, &dev_attr_configuration); 243 } 244 245 /* Interface fields */ 246 #define usb_intf_attr(field, format_string) \ 247 static ssize_t \ 248 show_##field (struct device *dev, struct device_attribute *attr, \ 249 char *buf) \ 250 { \ 251 struct usb_interface *intf = to_usb_interface (dev); \ 252 \ 253 return sprintf (buf, format_string, \ 254 intf->cur_altsetting->desc.field); \ 255 } \ 256 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 257 258 usb_intf_attr (bInterfaceNumber, "%02x\n") 259 usb_intf_attr (bAlternateSetting, "%2d\n") 260 usb_intf_attr (bNumEndpoints, "%02x\n") 261 usb_intf_attr (bInterfaceClass, "%02x\n") 262 usb_intf_attr (bInterfaceSubClass, "%02x\n") 263 usb_intf_attr (bInterfaceProtocol, "%02x\n") 264 265 static ssize_t show_interface_string(struct device *dev, 266 struct device_attribute *attr, char *buf) 267 { 268 struct usb_interface *intf; 269 struct usb_device *udev; 270 int len; 271 272 intf = to_usb_interface (dev); 273 udev = interface_to_usbdev (intf); 274 len = snprintf(buf, 256, "%s", intf->cur_altsetting->string); 275 if (len < 0) 276 return 0; 277 buf[len] = '\n'; 278 buf[len+1] = 0; 279 return len+1; 280 } 281 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL); 282 283 static ssize_t show_modalias(struct device *dev, 284 struct device_attribute *attr, char *buf) 285 { 286 struct usb_interface *intf; 287 struct usb_device *udev; 288 struct usb_host_interface *alt; 289 290 intf = to_usb_interface(dev); 291 udev = interface_to_usbdev(intf); 292 alt = intf->cur_altsetting; 293 294 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X" 295 "ic%02Xisc%02Xip%02X\n", 296 le16_to_cpu(udev->descriptor.idVendor), 297 le16_to_cpu(udev->descriptor.idProduct), 298 le16_to_cpu(udev->descriptor.bcdDevice), 299 udev->descriptor.bDeviceClass, 300 udev->descriptor.bDeviceSubClass, 301 udev->descriptor.bDeviceProtocol, 302 alt->desc.bInterfaceClass, 303 alt->desc.bInterfaceSubClass, 304 alt->desc.bInterfaceProtocol); 305 } 306 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); 307 308 static struct attribute *intf_attrs[] = { 309 &dev_attr_bInterfaceNumber.attr, 310 &dev_attr_bAlternateSetting.attr, 311 &dev_attr_bNumEndpoints.attr, 312 &dev_attr_bInterfaceClass.attr, 313 &dev_attr_bInterfaceSubClass.attr, 314 &dev_attr_bInterfaceProtocol.attr, 315 &dev_attr_modalias.attr, 316 NULL, 317 }; 318 static struct attribute_group intf_attr_grp = { 319 .attrs = intf_attrs, 320 }; 321 322 static inline void usb_create_intf_ep_files(struct usb_interface *intf, 323 struct usb_device *udev) 324 { 325 struct usb_host_interface *iface_desc; 326 int i; 327 328 iface_desc = intf->cur_altsetting; 329 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) 330 usb_create_ep_files(&intf->dev, &iface_desc->endpoint[i], 331 udev); 332 } 333 334 static inline void usb_remove_intf_ep_files(struct usb_interface *intf) 335 { 336 struct usb_host_interface *iface_desc; 337 int i; 338 339 iface_desc = intf->cur_altsetting; 340 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) 341 usb_remove_ep_files(&iface_desc->endpoint[i]); 342 } 343 344 void usb_create_sysfs_intf_files (struct usb_interface *intf) 345 { 346 struct usb_device *udev = interface_to_usbdev(intf); 347 struct usb_host_interface *alt = intf->cur_altsetting; 348 349 sysfs_create_group(&intf->dev.kobj, &intf_attr_grp); 350 351 if (alt->string == NULL) 352 alt->string = usb_cache_string(udev, alt->desc.iInterface); 353 if (alt->string) 354 device_create_file(&intf->dev, &dev_attr_interface); 355 usb_create_intf_ep_files(intf, udev); 356 } 357 358 void usb_remove_sysfs_intf_files (struct usb_interface *intf) 359 { 360 usb_remove_intf_ep_files(intf); 361 sysfs_remove_group(&intf->dev.kobj, &intf_attr_grp); 362 363 if (intf->cur_altsetting->string) 364 device_remove_file(&intf->dev, &dev_attr_interface); 365 } 366