David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 1 | /* |
| 2 | * f_rndis.c -- RNDIS link function driver |
| 3 | * |
| 4 | * Copyright (C) 2003-2005,2008 David Brownell |
| 5 | * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger |
| 6 | * Copyright (C) 2008 Nokia Corporation |
Michal Nazarewicz | b97503f | 2009-10-28 16:57:30 +0100 | [diff] [blame] | 7 | * Copyright (C) 2009 Samsung Electronics |
| 8 | * Author: Michal Nazarewicz (m.nazarewicz@samsung.com) |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 23 | */ |
| 24 | |
| 25 | /* #define VERBOSE_DEBUG */ |
| 26 | |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 27 | #include <linux/slab.h> |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 28 | #include <linux/kernel.h> |
| 29 | #include <linux/device.h> |
| 30 | #include <linux/etherdevice.h> |
| 31 | |
| 32 | #include <asm/atomic.h> |
| 33 | |
| 34 | #include "u_ether.h" |
| 35 | #include "rndis.h" |
| 36 | |
| 37 | |
| 38 | /* |
| 39 | * This function is an RNDIS Ethernet port -- a Microsoft protocol that's |
| 40 | * been promoted instead of the standard CDC Ethernet. The published RNDIS |
| 41 | * spec is ambiguous, incomplete, and needlessly complex. Variants such as |
| 42 | * ActiveSync have even worse status in terms of specification. |
| 43 | * |
| 44 | * In short: it's a protocol controlled by (and for) Microsoft, not for an |
| 45 | * Open ecosystem or markets. Linux supports it *only* because Microsoft |
| 46 | * doesn't support the CDC Ethernet standard. |
| 47 | * |
| 48 | * The RNDIS data transfer model is complex, with multiple Ethernet packets |
| 49 | * per USB message, and out of band data. The control model is built around |
| 50 | * what's essentially an "RNDIS RPC" protocol. It's all wrapped in a CDC ACM |
| 51 | * (modem, not Ethernet) veneer, with those ACM descriptors being entirely |
| 52 | * useless (they're ignored). RNDIS expects to be the only function in its |
| 53 | * configuration, so it's no real help if you need composite devices; and |
| 54 | * it expects to be the first configuration too. |
| 55 | * |
| 56 | * There is a single technical advantage of RNDIS over CDC Ethernet, if you |
| 57 | * discount the fluff that its RPC can be made to deliver: it doesn't need |
| 58 | * a NOP altsetting for the data interface. That lets it work on some of the |
| 59 | * "so smart it's stupid" hardware which takes over configuration changes |
| 60 | * from the software, and adds restrictions like "no altsettings". |
| 61 | * |
| 62 | * Unfortunately MSFT's RNDIS drivers are buggy. They hang or oops, and |
| 63 | * have all sorts of contrary-to-specification oddities that can prevent |
| 64 | * them from working sanely. Since bugfixes (or accurate specs, letting |
| 65 | * Linux work around those bugs) are unlikely to ever come from MSFT, you |
| 66 | * may want to avoid using RNDIS on purely operational grounds. |
| 67 | * |
| 68 | * Omissions from the RNDIS 1.0 specification include: |
| 69 | * |
| 70 | * - Power management ... references data that's scattered around lots |
| 71 | * of other documentation, which is incorrect/incomplete there too. |
| 72 | * |
| 73 | * - There are various undocumented protocol requirements, like the need |
| 74 | * to send garbage in some control-OUT messages. |
| 75 | * |
| 76 | * - MS-Windows drivers sometimes emit undocumented requests. |
| 77 | */ |
| 78 | |
| 79 | struct rndis_ep_descs { |
| 80 | struct usb_endpoint_descriptor *in; |
| 81 | struct usb_endpoint_descriptor *out; |
| 82 | struct usb_endpoint_descriptor *notify; |
| 83 | }; |
| 84 | |
| 85 | struct f_rndis { |
| 86 | struct gether port; |
| 87 | u8 ctrl_id, data_id; |
| 88 | u8 ethaddr[ETH_ALEN]; |
| 89 | int config; |
| 90 | |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 91 | struct rndis_ep_descs fs; |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 92 | struct rndis_ep_descs hs; |
| 93 | |
| 94 | struct usb_ep *notify; |
| 95 | struct usb_endpoint_descriptor *notify_desc; |
| 96 | struct usb_request *notify_req; |
| 97 | atomic_t notify_count; |
| 98 | }; |
| 99 | |
| 100 | static inline struct f_rndis *func_to_rndis(struct usb_function *f) |
| 101 | { |
| 102 | return container_of(f, struct f_rndis, port.func); |
| 103 | } |
| 104 | |
| 105 | /* peak (theoretical) bulk transfer rate in bits-per-second */ |
| 106 | static unsigned int bitrate(struct usb_gadget *g) |
| 107 | { |
| 108 | if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) |
| 109 | return 13 * 512 * 8 * 1000 * 8; |
| 110 | else |
| 111 | return 19 * 64 * 1 * 1000 * 8; |
| 112 | } |
| 113 | |
| 114 | /*-------------------------------------------------------------------------*/ |
| 115 | |
| 116 | /* |
| 117 | */ |
| 118 | |
| 119 | #define LOG2_STATUS_INTERVAL_MSEC 5 /* 1 << 5 == 32 msec */ |
| 120 | #define STATUS_BYTECOUNT 8 /* 8 bytes data */ |
| 121 | |
| 122 | |
| 123 | /* interface descriptor: */ |
| 124 | |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 125 | static struct usb_interface_descriptor rndis_control_intf = { |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 126 | .bLength = sizeof rndis_control_intf, |
| 127 | .bDescriptorType = USB_DT_INTERFACE, |
| 128 | |
| 129 | /* .bInterfaceNumber = DYNAMIC */ |
| 130 | /* status endpoint is optional; this could be patched later */ |
| 131 | .bNumEndpoints = 1, |
| 132 | .bInterfaceClass = USB_CLASS_COMM, |
| 133 | .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM, |
| 134 | .bInterfaceProtocol = USB_CDC_ACM_PROTO_VENDOR, |
| 135 | /* .iInterface = DYNAMIC */ |
| 136 | }; |
| 137 | |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 138 | static struct usb_cdc_header_desc header_desc = { |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 139 | .bLength = sizeof header_desc, |
| 140 | .bDescriptorType = USB_DT_CS_INTERFACE, |
| 141 | .bDescriptorSubType = USB_CDC_HEADER_TYPE, |
| 142 | |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 143 | .bcdCDC = cpu_to_le16(0x0110), |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 144 | }; |
| 145 | |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 146 | static struct usb_cdc_call_mgmt_descriptor call_mgmt_descriptor = { |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 147 | .bLength = sizeof call_mgmt_descriptor, |
| 148 | .bDescriptorType = USB_DT_CS_INTERFACE, |
| 149 | .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE, |
| 150 | |
| 151 | .bmCapabilities = 0x00, |
| 152 | .bDataInterface = 0x01, |
| 153 | }; |
| 154 | |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 155 | static struct usb_cdc_acm_descriptor rndis_acm_descriptor = { |
Michal Nazarewicz | b97503f | 2009-10-28 16:57:30 +0100 | [diff] [blame] | 156 | .bLength = sizeof rndis_acm_descriptor, |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 157 | .bDescriptorType = USB_DT_CS_INTERFACE, |
| 158 | .bDescriptorSubType = USB_CDC_ACM_TYPE, |
| 159 | |
| 160 | .bmCapabilities = 0x00, |
| 161 | }; |
| 162 | |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 163 | static struct usb_cdc_union_desc rndis_union_desc = { |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 164 | .bLength = sizeof(rndis_union_desc), |
| 165 | .bDescriptorType = USB_DT_CS_INTERFACE, |
| 166 | .bDescriptorSubType = USB_CDC_UNION_TYPE, |
| 167 | /* .bMasterInterface0 = DYNAMIC */ |
| 168 | /* .bSlaveInterface0 = DYNAMIC */ |
| 169 | }; |
| 170 | |
| 171 | /* the data interface has two bulk endpoints */ |
| 172 | |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 173 | static struct usb_interface_descriptor rndis_data_intf = { |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 174 | .bLength = sizeof rndis_data_intf, |
| 175 | .bDescriptorType = USB_DT_INTERFACE, |
| 176 | |
| 177 | /* .bInterfaceNumber = DYNAMIC */ |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 178 | .bNumEndpoints = 2, |
| 179 | .bInterfaceClass = USB_CLASS_CDC_DATA, |
| 180 | .bInterfaceSubClass = 0, |
| 181 | .bInterfaceProtocol = 0, |
| 182 | /* .iInterface = DYNAMIC */ |
| 183 | }; |
| 184 | |
Michal Nazarewicz | b97503f | 2009-10-28 16:57:30 +0100 | [diff] [blame] | 185 | |
| 186 | static struct usb_interface_assoc_descriptor |
| 187 | rndis_iad_descriptor = { |
| 188 | .bLength = sizeof rndis_iad_descriptor, |
| 189 | .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION, |
| 190 | |
| 191 | .bFirstInterface = 0, /* XXX, hardcoded */ |
| 192 | .bInterfaceCount = 2, // control + data |
| 193 | .bFunctionClass = USB_CLASS_COMM, |
| 194 | .bFunctionSubClass = USB_CDC_SUBCLASS_ETHERNET, |
| 195 | .bFunctionProtocol = USB_CDC_PROTO_NONE, |
| 196 | /* .iFunction = DYNAMIC */ |
| 197 | }; |
| 198 | |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 199 | /* full speed support: */ |
| 200 | |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 201 | static struct usb_endpoint_descriptor fs_notify_desc = { |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 202 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 203 | .bDescriptorType = USB_DT_ENDPOINT, |
| 204 | |
| 205 | .bEndpointAddress = USB_DIR_IN, |
| 206 | .bmAttributes = USB_ENDPOINT_XFER_INT, |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 207 | .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT), |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 208 | .bInterval = 1 << LOG2_STATUS_INTERVAL_MSEC, |
| 209 | }; |
| 210 | |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 211 | static struct usb_endpoint_descriptor fs_in_desc = { |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 212 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 213 | .bDescriptorType = USB_DT_ENDPOINT, |
| 214 | |
| 215 | .bEndpointAddress = USB_DIR_IN, |
| 216 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 217 | }; |
| 218 | |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 219 | static struct usb_endpoint_descriptor fs_out_desc = { |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 220 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 221 | .bDescriptorType = USB_DT_ENDPOINT, |
| 222 | |
| 223 | .bEndpointAddress = USB_DIR_OUT, |
| 224 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 225 | }; |
| 226 | |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 227 | static struct usb_descriptor_header *eth_fs_function[] = { |
Michal Nazarewicz | b97503f | 2009-10-28 16:57:30 +0100 | [diff] [blame] | 228 | (struct usb_descriptor_header *) &rndis_iad_descriptor, |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 229 | /* control interface matches ACM, not Ethernet */ |
| 230 | (struct usb_descriptor_header *) &rndis_control_intf, |
| 231 | (struct usb_descriptor_header *) &header_desc, |
| 232 | (struct usb_descriptor_header *) &call_mgmt_descriptor, |
Michal Nazarewicz | b97503f | 2009-10-28 16:57:30 +0100 | [diff] [blame] | 233 | (struct usb_descriptor_header *) &rndis_acm_descriptor, |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 234 | (struct usb_descriptor_header *) &rndis_union_desc, |
| 235 | (struct usb_descriptor_header *) &fs_notify_desc, |
| 236 | /* data interface has no altsetting */ |
| 237 | (struct usb_descriptor_header *) &rndis_data_intf, |
| 238 | (struct usb_descriptor_header *) &fs_in_desc, |
| 239 | (struct usb_descriptor_header *) &fs_out_desc, |
| 240 | NULL, |
| 241 | }; |
| 242 | |
| 243 | /* high speed support: */ |
| 244 | |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 245 | static struct usb_endpoint_descriptor hs_notify_desc = { |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 246 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 247 | .bDescriptorType = USB_DT_ENDPOINT, |
| 248 | |
| 249 | .bEndpointAddress = USB_DIR_IN, |
| 250 | .bmAttributes = USB_ENDPOINT_XFER_INT, |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 251 | .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT), |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 252 | .bInterval = LOG2_STATUS_INTERVAL_MSEC + 4, |
| 253 | }; |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 254 | static struct usb_endpoint_descriptor hs_in_desc = { |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 255 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 256 | .bDescriptorType = USB_DT_ENDPOINT, |
| 257 | |
| 258 | .bEndpointAddress = USB_DIR_IN, |
| 259 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 260 | .wMaxPacketSize = cpu_to_le16(512), |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 261 | }; |
| 262 | |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 263 | static struct usb_endpoint_descriptor hs_out_desc = { |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 264 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 265 | .bDescriptorType = USB_DT_ENDPOINT, |
| 266 | |
| 267 | .bEndpointAddress = USB_DIR_OUT, |
| 268 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 269 | .wMaxPacketSize = cpu_to_le16(512), |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 270 | }; |
| 271 | |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 272 | static struct usb_descriptor_header *eth_hs_function[] = { |
Michal Nazarewicz | b97503f | 2009-10-28 16:57:30 +0100 | [diff] [blame] | 273 | (struct usb_descriptor_header *) &rndis_iad_descriptor, |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 274 | /* control interface matches ACM, not Ethernet */ |
| 275 | (struct usb_descriptor_header *) &rndis_control_intf, |
| 276 | (struct usb_descriptor_header *) &header_desc, |
| 277 | (struct usb_descriptor_header *) &call_mgmt_descriptor, |
Michal Nazarewicz | b97503f | 2009-10-28 16:57:30 +0100 | [diff] [blame] | 278 | (struct usb_descriptor_header *) &rndis_acm_descriptor, |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 279 | (struct usb_descriptor_header *) &rndis_union_desc, |
| 280 | (struct usb_descriptor_header *) &hs_notify_desc, |
| 281 | /* data interface has no altsetting */ |
| 282 | (struct usb_descriptor_header *) &rndis_data_intf, |
| 283 | (struct usb_descriptor_header *) &hs_in_desc, |
| 284 | (struct usb_descriptor_header *) &hs_out_desc, |
| 285 | NULL, |
| 286 | }; |
| 287 | |
| 288 | /* string descriptors: */ |
| 289 | |
| 290 | static struct usb_string rndis_string_defs[] = { |
| 291 | [0].s = "RNDIS Communications Control", |
| 292 | [1].s = "RNDIS Ethernet Data", |
Michal Nazarewicz | b97503f | 2009-10-28 16:57:30 +0100 | [diff] [blame] | 293 | [2].s = "RNDIS", |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 294 | { } /* end of list */ |
| 295 | }; |
| 296 | |
| 297 | static struct usb_gadget_strings rndis_string_table = { |
| 298 | .language = 0x0409, /* en-us */ |
| 299 | .strings = rndis_string_defs, |
| 300 | }; |
| 301 | |
| 302 | static struct usb_gadget_strings *rndis_strings[] = { |
| 303 | &rndis_string_table, |
| 304 | NULL, |
| 305 | }; |
| 306 | |
| 307 | /*-------------------------------------------------------------------------*/ |
| 308 | |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 309 | static struct sk_buff *rndis_add_header(struct gether *port, |
| 310 | struct sk_buff *skb) |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 311 | { |
Brian Niebuhr | 9b39e9d | 2009-08-14 10:04:22 -0500 | [diff] [blame] | 312 | struct sk_buff *skb2; |
| 313 | |
| 314 | skb2 = skb_realloc_headroom(skb, sizeof(struct rndis_packet_msg_type)); |
| 315 | if (skb2) |
| 316 | rndis_add_hdr(skb2); |
| 317 | |
| 318 | dev_kfree_skb_any(skb); |
| 319 | return skb2; |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 320 | } |
| 321 | |
| 322 | static void rndis_response_available(void *_rndis) |
| 323 | { |
| 324 | struct f_rndis *rndis = _rndis; |
| 325 | struct usb_request *req = rndis->notify_req; |
| 326 | struct usb_composite_dev *cdev = rndis->port.func.config->cdev; |
| 327 | __le32 *data = req->buf; |
| 328 | int status; |
| 329 | |
Richard Röjfors | ff34950 | 2008-11-15 19:53:24 -0800 | [diff] [blame] | 330 | if (atomic_inc_return(&rndis->notify_count) != 1) |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 331 | return; |
| 332 | |
| 333 | /* Send RNDIS RESPONSE_AVAILABLE notification; a |
| 334 | * USB_CDC_NOTIFY_RESPONSE_AVAILABLE "should" work too |
| 335 | * |
| 336 | * This is the only notification defined by RNDIS. |
| 337 | */ |
| 338 | data[0] = cpu_to_le32(1); |
| 339 | data[1] = cpu_to_le32(0); |
| 340 | |
| 341 | status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC); |
| 342 | if (status) { |
| 343 | atomic_dec(&rndis->notify_count); |
| 344 | DBG(cdev, "notify/0 --> %d\n", status); |
| 345 | } |
| 346 | } |
| 347 | |
| 348 | static void rndis_response_complete(struct usb_ep *ep, struct usb_request *req) |
| 349 | { |
| 350 | struct f_rndis *rndis = req->context; |
| 351 | struct usb_composite_dev *cdev = rndis->port.func.config->cdev; |
| 352 | int status = req->status; |
| 353 | |
| 354 | /* after TX: |
| 355 | * - USB_CDC_GET_ENCAPSULATED_RESPONSE (ep0/control) |
| 356 | * - RNDIS_RESPONSE_AVAILABLE (status/irq) |
| 357 | */ |
| 358 | switch (status) { |
| 359 | case -ECONNRESET: |
| 360 | case -ESHUTDOWN: |
| 361 | /* connection gone */ |
| 362 | atomic_set(&rndis->notify_count, 0); |
| 363 | break; |
| 364 | default: |
| 365 | DBG(cdev, "RNDIS %s response error %d, %d/%d\n", |
| 366 | ep->name, status, |
| 367 | req->actual, req->length); |
| 368 | /* FALLTHROUGH */ |
| 369 | case 0: |
| 370 | if (ep != rndis->notify) |
| 371 | break; |
| 372 | |
| 373 | /* handle multiple pending RNDIS_RESPONSE_AVAILABLE |
| 374 | * notifications by resending until we're done |
| 375 | */ |
| 376 | if (atomic_dec_and_test(&rndis->notify_count)) |
| 377 | break; |
| 378 | status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC); |
| 379 | if (status) { |
| 380 | atomic_dec(&rndis->notify_count); |
| 381 | DBG(cdev, "notify/1 --> %d\n", status); |
| 382 | } |
| 383 | break; |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | static void rndis_command_complete(struct usb_ep *ep, struct usb_request *req) |
| 388 | { |
| 389 | struct f_rndis *rndis = req->context; |
| 390 | struct usb_composite_dev *cdev = rndis->port.func.config->cdev; |
| 391 | int status; |
| 392 | |
| 393 | /* received RNDIS command from USB_CDC_SEND_ENCAPSULATED_COMMAND */ |
| 394 | // spin_lock(&dev->lock); |
| 395 | status = rndis_msg_parser(rndis->config, (u8 *) req->buf); |
| 396 | if (status < 0) |
| 397 | ERROR(cdev, "RNDIS command error %d, %d/%d\n", |
| 398 | status, req->actual, req->length); |
| 399 | // spin_unlock(&dev->lock); |
| 400 | } |
| 401 | |
| 402 | static int |
| 403 | rndis_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) |
| 404 | { |
| 405 | struct f_rndis *rndis = func_to_rndis(f); |
| 406 | struct usb_composite_dev *cdev = f->config->cdev; |
| 407 | struct usb_request *req = cdev->req; |
| 408 | int value = -EOPNOTSUPP; |
| 409 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
| 410 | u16 w_value = le16_to_cpu(ctrl->wValue); |
| 411 | u16 w_length = le16_to_cpu(ctrl->wLength); |
| 412 | |
| 413 | /* composite driver infrastructure handles everything except |
| 414 | * CDC class messages; interface activation uses set_alt(). |
| 415 | */ |
| 416 | switch ((ctrl->bRequestType << 8) | ctrl->bRequest) { |
| 417 | |
| 418 | /* RNDIS uses the CDC command encapsulation mechanism to implement |
| 419 | * an RPC scheme, with much getting/setting of attributes by OID. |
| 420 | */ |
| 421 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) |
| 422 | | USB_CDC_SEND_ENCAPSULATED_COMMAND: |
Felipe Balbi | 472b912 | 2011-05-13 16:53:48 +0300 | [diff] [blame] | 423 | if (w_value || w_index != rndis->ctrl_id) |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 424 | goto invalid; |
| 425 | /* read the request; process it later */ |
| 426 | value = w_length; |
| 427 | req->complete = rndis_command_complete; |
| 428 | req->context = rndis; |
| 429 | /* later, rndis_response_available() sends a notification */ |
| 430 | break; |
| 431 | |
| 432 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) |
| 433 | | USB_CDC_GET_ENCAPSULATED_RESPONSE: |
| 434 | if (w_value || w_index != rndis->ctrl_id) |
| 435 | goto invalid; |
| 436 | else { |
| 437 | u8 *buf; |
| 438 | u32 n; |
| 439 | |
| 440 | /* return the result */ |
| 441 | buf = rndis_get_next_response(rndis->config, &n); |
| 442 | if (buf) { |
| 443 | memcpy(req->buf, buf, n); |
| 444 | req->complete = rndis_response_complete; |
| 445 | rndis_free_response(rndis->config, buf); |
| 446 | value = n; |
| 447 | } |
| 448 | /* else stalls ... spec says to avoid that */ |
| 449 | } |
| 450 | break; |
| 451 | |
| 452 | default: |
| 453 | invalid: |
| 454 | VDBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", |
| 455 | ctrl->bRequestType, ctrl->bRequest, |
| 456 | w_value, w_index, w_length); |
| 457 | } |
| 458 | |
| 459 | /* respond with data transfer or status phase? */ |
| 460 | if (value >= 0) { |
| 461 | DBG(cdev, "rndis req%02x.%02x v%04x i%04x l%d\n", |
| 462 | ctrl->bRequestType, ctrl->bRequest, |
| 463 | w_value, w_index, w_length); |
David Brownell | 090b901 | 2009-03-20 01:08:20 -0700 | [diff] [blame] | 464 | req->zero = (value < w_length); |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 465 | req->length = value; |
| 466 | value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); |
| 467 | if (value < 0) |
| 468 | ERROR(cdev, "rndis response on err %d\n", value); |
| 469 | } |
| 470 | |
| 471 | /* device either stalls (value < 0) or reports success */ |
| 472 | return value; |
| 473 | } |
| 474 | |
| 475 | |
| 476 | static int rndis_set_alt(struct usb_function *f, unsigned intf, unsigned alt) |
| 477 | { |
| 478 | struct f_rndis *rndis = func_to_rndis(f); |
| 479 | struct usb_composite_dev *cdev = f->config->cdev; |
| 480 | |
| 481 | /* we know alt == 0 */ |
| 482 | |
| 483 | if (intf == rndis->ctrl_id) { |
| 484 | if (rndis->notify->driver_data) { |
| 485 | VDBG(cdev, "reset rndis control %d\n", intf); |
| 486 | usb_ep_disable(rndis->notify); |
| 487 | } else { |
| 488 | VDBG(cdev, "init rndis ctrl %d\n", intf); |
| 489 | rndis->notify_desc = ep_choose(cdev->gadget, |
| 490 | rndis->hs.notify, |
| 491 | rndis->fs.notify); |
| 492 | } |
| 493 | usb_ep_enable(rndis->notify, rndis->notify_desc); |
| 494 | rndis->notify->driver_data = rndis; |
| 495 | |
| 496 | } else if (intf == rndis->data_id) { |
| 497 | struct net_device *net; |
| 498 | |
| 499 | if (rndis->port.in_ep->driver_data) { |
| 500 | DBG(cdev, "reset rndis\n"); |
| 501 | gether_disconnect(&rndis->port); |
Maulik Mankad | 830d1b1 | 2009-05-29 18:34:40 +0530 | [diff] [blame] | 502 | } |
| 503 | |
| 504 | if (!rndis->port.in) { |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 505 | DBG(cdev, "init rndis\n"); |
| 506 | rndis->port.in = ep_choose(cdev->gadget, |
| 507 | rndis->hs.in, rndis->fs.in); |
| 508 | rndis->port.out = ep_choose(cdev->gadget, |
| 509 | rndis->hs.out, rndis->fs.out); |
| 510 | } |
| 511 | |
| 512 | /* Avoid ZLPs; they can be troublesome. */ |
| 513 | rndis->port.is_zlp_ok = false; |
| 514 | |
| 515 | /* RNDIS should be in the "RNDIS uninitialized" state, |
| 516 | * either never activated or after rndis_uninit(). |
| 517 | * |
| 518 | * We don't want data to flow here until a nonzero packet |
| 519 | * filter is set, at which point it enters "RNDIS data |
| 520 | * initialized" state ... but we do want the endpoints |
| 521 | * to be activated. It's a strange little state. |
| 522 | * |
| 523 | * REVISIT the RNDIS gadget code has done this wrong for a |
| 524 | * very long time. We need another call to the link layer |
| 525 | * code -- gether_updown(...bool) maybe -- to do it right. |
| 526 | */ |
| 527 | rndis->port.cdc_filter = 0; |
| 528 | |
| 529 | DBG(cdev, "RNDIS RX/TX early activation ... \n"); |
| 530 | net = gether_connect(&rndis->port); |
| 531 | if (IS_ERR(net)) |
| 532 | return PTR_ERR(net); |
| 533 | |
| 534 | rndis_set_param_dev(rndis->config, net, |
| 535 | &rndis->port.cdc_filter); |
| 536 | } else |
| 537 | goto fail; |
| 538 | |
| 539 | return 0; |
| 540 | fail: |
| 541 | return -EINVAL; |
| 542 | } |
| 543 | |
| 544 | static void rndis_disable(struct usb_function *f) |
| 545 | { |
| 546 | struct f_rndis *rndis = func_to_rndis(f); |
| 547 | struct usb_composite_dev *cdev = f->config->cdev; |
| 548 | |
| 549 | if (!rndis->notify->driver_data) |
| 550 | return; |
| 551 | |
| 552 | DBG(cdev, "rndis deactivated\n"); |
| 553 | |
| 554 | rndis_uninit(rndis->config); |
| 555 | gether_disconnect(&rndis->port); |
| 556 | |
| 557 | usb_ep_disable(rndis->notify); |
| 558 | rndis->notify->driver_data = NULL; |
| 559 | } |
| 560 | |
| 561 | /*-------------------------------------------------------------------------*/ |
| 562 | |
| 563 | /* |
| 564 | * This isn't quite the same mechanism as CDC Ethernet, since the |
| 565 | * notification scheme passes less data, but the same set of link |
| 566 | * states must be tested. A key difference is that altsettings are |
| 567 | * not used to tell whether the link should send packets or not. |
| 568 | */ |
| 569 | |
| 570 | static void rndis_open(struct gether *geth) |
| 571 | { |
| 572 | struct f_rndis *rndis = func_to_rndis(&geth->func); |
| 573 | struct usb_composite_dev *cdev = geth->func.config->cdev; |
| 574 | |
| 575 | DBG(cdev, "%s\n", __func__); |
| 576 | |
| 577 | rndis_set_param_medium(rndis->config, NDIS_MEDIUM_802_3, |
| 578 | bitrate(cdev->gadget) / 100); |
| 579 | rndis_signal_connect(rndis->config); |
| 580 | } |
| 581 | |
| 582 | static void rndis_close(struct gether *geth) |
| 583 | { |
| 584 | struct f_rndis *rndis = func_to_rndis(&geth->func); |
| 585 | |
| 586 | DBG(geth->func.config->cdev, "%s\n", __func__); |
| 587 | |
| 588 | rndis_set_param_medium(rndis->config, NDIS_MEDIUM_802_3, 0); |
| 589 | rndis_signal_disconnect(rndis->config); |
| 590 | } |
| 591 | |
| 592 | /*-------------------------------------------------------------------------*/ |
| 593 | |
| 594 | /* ethernet function driver setup/binding */ |
| 595 | |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 596 | static int |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 597 | rndis_bind(struct usb_configuration *c, struct usb_function *f) |
| 598 | { |
| 599 | struct usb_composite_dev *cdev = c->cdev; |
| 600 | struct f_rndis *rndis = func_to_rndis(f); |
| 601 | int status; |
| 602 | struct usb_ep *ep; |
| 603 | |
| 604 | /* allocate instance-specific interface IDs */ |
| 605 | status = usb_interface_id(c, f); |
| 606 | if (status < 0) |
| 607 | goto fail; |
| 608 | rndis->ctrl_id = status; |
Michal Nazarewicz | b97503f | 2009-10-28 16:57:30 +0100 | [diff] [blame] | 609 | rndis_iad_descriptor.bFirstInterface = status; |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 610 | |
| 611 | rndis_control_intf.bInterfaceNumber = status; |
| 612 | rndis_union_desc.bMasterInterface0 = status; |
| 613 | |
| 614 | status = usb_interface_id(c, f); |
| 615 | if (status < 0) |
| 616 | goto fail; |
| 617 | rndis->data_id = status; |
| 618 | |
| 619 | rndis_data_intf.bInterfaceNumber = status; |
| 620 | rndis_union_desc.bSlaveInterface0 = status; |
| 621 | |
| 622 | status = -ENODEV; |
| 623 | |
| 624 | /* allocate instance-specific endpoints */ |
| 625 | ep = usb_ep_autoconfig(cdev->gadget, &fs_in_desc); |
| 626 | if (!ep) |
| 627 | goto fail; |
| 628 | rndis->port.in_ep = ep; |
| 629 | ep->driver_data = cdev; /* claim */ |
| 630 | |
| 631 | ep = usb_ep_autoconfig(cdev->gadget, &fs_out_desc); |
| 632 | if (!ep) |
| 633 | goto fail; |
| 634 | rndis->port.out_ep = ep; |
| 635 | ep->driver_data = cdev; /* claim */ |
| 636 | |
| 637 | /* NOTE: a status/notification endpoint is, strictly speaking, |
| 638 | * optional. We don't treat it that way though! It's simpler, |
| 639 | * and some newer profiles don't treat it as optional. |
| 640 | */ |
| 641 | ep = usb_ep_autoconfig(cdev->gadget, &fs_notify_desc); |
| 642 | if (!ep) |
| 643 | goto fail; |
| 644 | rndis->notify = ep; |
| 645 | ep->driver_data = cdev; /* claim */ |
| 646 | |
| 647 | status = -ENOMEM; |
| 648 | |
| 649 | /* allocate notification request and buffer */ |
| 650 | rndis->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL); |
| 651 | if (!rndis->notify_req) |
| 652 | goto fail; |
| 653 | rndis->notify_req->buf = kmalloc(STATUS_BYTECOUNT, GFP_KERNEL); |
| 654 | if (!rndis->notify_req->buf) |
| 655 | goto fail; |
| 656 | rndis->notify_req->length = STATUS_BYTECOUNT; |
| 657 | rndis->notify_req->context = rndis; |
| 658 | rndis->notify_req->complete = rndis_response_complete; |
| 659 | |
| 660 | /* copy descriptors, and track endpoint copies */ |
| 661 | f->descriptors = usb_copy_descriptors(eth_fs_function); |
| 662 | if (!f->descriptors) |
| 663 | goto fail; |
| 664 | |
| 665 | rndis->fs.in = usb_find_endpoint(eth_fs_function, |
| 666 | f->descriptors, &fs_in_desc); |
| 667 | rndis->fs.out = usb_find_endpoint(eth_fs_function, |
| 668 | f->descriptors, &fs_out_desc); |
| 669 | rndis->fs.notify = usb_find_endpoint(eth_fs_function, |
| 670 | f->descriptors, &fs_notify_desc); |
| 671 | |
| 672 | /* support all relevant hardware speeds... we expect that when |
| 673 | * hardware is dual speed, all bulk-capable endpoints work at |
| 674 | * both speeds |
| 675 | */ |
| 676 | if (gadget_is_dualspeed(c->cdev->gadget)) { |
| 677 | hs_in_desc.bEndpointAddress = |
| 678 | fs_in_desc.bEndpointAddress; |
| 679 | hs_out_desc.bEndpointAddress = |
| 680 | fs_out_desc.bEndpointAddress; |
David Brownell | 7c12414 | 2008-11-24 23:11:03 -0800 | [diff] [blame] | 681 | hs_notify_desc.bEndpointAddress = |
| 682 | fs_notify_desc.bEndpointAddress; |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 683 | |
| 684 | /* copy descriptors, and track endpoint copies */ |
| 685 | f->hs_descriptors = usb_copy_descriptors(eth_hs_function); |
| 686 | |
| 687 | if (!f->hs_descriptors) |
| 688 | goto fail; |
| 689 | |
| 690 | rndis->hs.in = usb_find_endpoint(eth_hs_function, |
| 691 | f->hs_descriptors, &hs_in_desc); |
| 692 | rndis->hs.out = usb_find_endpoint(eth_hs_function, |
| 693 | f->hs_descriptors, &hs_out_desc); |
David Brownell | 7c12414 | 2008-11-24 23:11:03 -0800 | [diff] [blame] | 694 | rndis->hs.notify = usb_find_endpoint(eth_hs_function, |
| 695 | f->hs_descriptors, &hs_notify_desc); |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 696 | } |
| 697 | |
| 698 | rndis->port.open = rndis_open; |
| 699 | rndis->port.close = rndis_close; |
| 700 | |
| 701 | status = rndis_register(rndis_response_available, rndis); |
| 702 | if (status < 0) |
| 703 | goto fail; |
| 704 | rndis->config = status; |
| 705 | |
| 706 | rndis_set_param_medium(rndis->config, NDIS_MEDIUM_802_3, 0); |
| 707 | rndis_set_host_mac(rndis->config, rndis->ethaddr); |
| 708 | |
| 709 | #if 0 |
| 710 | // FIXME |
| 711 | if (rndis_set_param_vendor(rndis->config, vendorID, |
| 712 | manufacturer)) |
| 713 | goto fail0; |
| 714 | #endif |
| 715 | |
| 716 | /* NOTE: all that is done without knowing or caring about |
| 717 | * the network link ... which is unavailable to this code |
| 718 | * until we're activated via set_alt(). |
| 719 | */ |
| 720 | |
| 721 | DBG(cdev, "RNDIS: %s speed IN/%s OUT/%s NOTIFY/%s\n", |
| 722 | gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full", |
| 723 | rndis->port.in_ep->name, rndis->port.out_ep->name, |
| 724 | rndis->notify->name); |
| 725 | return 0; |
| 726 | |
| 727 | fail: |
| 728 | if (gadget_is_dualspeed(c->cdev->gadget) && f->hs_descriptors) |
| 729 | usb_free_descriptors(f->hs_descriptors); |
| 730 | if (f->descriptors) |
| 731 | usb_free_descriptors(f->descriptors); |
| 732 | |
| 733 | if (rndis->notify_req) { |
| 734 | kfree(rndis->notify_req->buf); |
| 735 | usb_ep_free_request(rndis->notify, rndis->notify_req); |
| 736 | } |
| 737 | |
| 738 | /* we might as well release our claims on endpoints */ |
| 739 | if (rndis->notify) |
| 740 | rndis->notify->driver_data = NULL; |
| 741 | if (rndis->port.out) |
| 742 | rndis->port.out_ep->driver_data = NULL; |
| 743 | if (rndis->port.in) |
| 744 | rndis->port.in_ep->driver_data = NULL; |
| 745 | |
| 746 | ERROR(cdev, "%s: can't bind, err %d\n", f->name, status); |
| 747 | |
| 748 | return status; |
| 749 | } |
| 750 | |
| 751 | static void |
| 752 | rndis_unbind(struct usb_configuration *c, struct usb_function *f) |
| 753 | { |
| 754 | struct f_rndis *rndis = func_to_rndis(f); |
| 755 | |
| 756 | rndis_deregister(rndis->config); |
| 757 | rndis_exit(); |
| 758 | |
| 759 | if (gadget_is_dualspeed(c->cdev->gadget)) |
| 760 | usb_free_descriptors(f->hs_descriptors); |
| 761 | usb_free_descriptors(f->descriptors); |
| 762 | |
| 763 | kfree(rndis->notify_req->buf); |
| 764 | usb_ep_free_request(rndis->notify, rndis->notify_req); |
| 765 | |
| 766 | kfree(rndis); |
| 767 | } |
| 768 | |
| 769 | /* Some controllers can't support RNDIS ... */ |
| 770 | static inline bool can_support_rndis(struct usb_configuration *c) |
| 771 | { |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 772 | /* everything else is *presumably* fine */ |
| 773 | return true; |
| 774 | } |
| 775 | |
| 776 | /** |
| 777 | * rndis_bind_config - add RNDIS network link to a configuration |
| 778 | * @c: the configuration to support the network link |
| 779 | * @ethaddr: a buffer in which the ethernet address of the host side |
| 780 | * side of the link was recorded |
| 781 | * Context: single threaded during gadget setup |
| 782 | * |
| 783 | * Returns zero on success, else negative errno. |
| 784 | * |
| 785 | * Caller must have called @gether_setup(). Caller is also responsible |
| 786 | * for calling @gether_cleanup() before module unload. |
| 787 | */ |
Michal Nazarewicz | 28824b1 | 2010-05-05 12:53:13 +0200 | [diff] [blame] | 788 | int |
| 789 | rndis_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]) |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 790 | { |
| 791 | struct f_rndis *rndis; |
| 792 | int status; |
| 793 | |
| 794 | if (!can_support_rndis(c) || !ethaddr) |
| 795 | return -EINVAL; |
| 796 | |
| 797 | /* maybe allocate device-global string IDs */ |
| 798 | if (rndis_string_defs[0].id == 0) { |
| 799 | |
| 800 | /* ... and setup RNDIS itself */ |
| 801 | status = rndis_init(); |
| 802 | if (status < 0) |
| 803 | return status; |
| 804 | |
| 805 | /* control interface label */ |
| 806 | status = usb_string_id(c->cdev); |
| 807 | if (status < 0) |
| 808 | return status; |
| 809 | rndis_string_defs[0].id = status; |
| 810 | rndis_control_intf.iInterface = status; |
| 811 | |
| 812 | /* data interface label */ |
| 813 | status = usb_string_id(c->cdev); |
| 814 | if (status < 0) |
| 815 | return status; |
| 816 | rndis_string_defs[1].id = status; |
| 817 | rndis_data_intf.iInterface = status; |
Michal Nazarewicz | b97503f | 2009-10-28 16:57:30 +0100 | [diff] [blame] | 818 | |
| 819 | /* IAD iFunction label */ |
| 820 | status = usb_string_id(c->cdev); |
| 821 | if (status < 0) |
| 822 | return status; |
| 823 | rndis_string_defs[2].id = status; |
| 824 | rndis_iad_descriptor.iFunction = status; |
David Brownell | 45fe3b8 | 2008-06-19 18:20:04 -0700 | [diff] [blame] | 825 | } |
| 826 | |
| 827 | /* allocate and initialize one new instance */ |
| 828 | status = -ENOMEM; |
| 829 | rndis = kzalloc(sizeof *rndis, GFP_KERNEL); |
| 830 | if (!rndis) |
| 831 | goto fail; |
| 832 | |
| 833 | memcpy(rndis->ethaddr, ethaddr, ETH_ALEN); |
| 834 | |
| 835 | /* RNDIS activates when the host changes this filter */ |
| 836 | rndis->port.cdc_filter = 0; |
| 837 | |
| 838 | /* RNDIS has special (and complex) framing */ |
| 839 | rndis->port.header_len = sizeof(struct rndis_packet_msg_type); |
| 840 | rndis->port.wrap = rndis_add_header; |
| 841 | rndis->port.unwrap = rndis_rm_hdr; |
| 842 | |
| 843 | rndis->port.func.name = "rndis"; |
| 844 | rndis->port.func.strings = rndis_strings; |
| 845 | /* descriptors are per-instance copies */ |
| 846 | rndis->port.func.bind = rndis_bind; |
| 847 | rndis->port.func.unbind = rndis_unbind; |
| 848 | rndis->port.func.set_alt = rndis_set_alt; |
| 849 | rndis->port.func.setup = rndis_setup; |
| 850 | rndis->port.func.disable = rndis_disable; |
| 851 | |
| 852 | status = usb_add_function(c, &rndis->port.func); |
| 853 | if (status) { |
| 854 | kfree(rndis); |
| 855 | fail: |
| 856 | rndis_exit(); |
| 857 | } |
| 858 | return status; |
| 859 | } |