drivers/staging/vt6656/usbpipe.c

   1 /*
   2  * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
   3  * All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  *
  16  * File: usbpipe.c
  17  *
  18  * Purpose: Handle USB control endpoint
  19  *
  20  * Author: Warren Hsu
  21  *
  22  * Date: Mar. 29, 2005
  23  *
  24  * Functions:
  25  *      vnt_control_out - Write variable length bytes to MEM/BB/MAC/EEPROM
  26  *      vnt_control_in - Read variable length bytes from MEM/BB/MAC/EEPROM
  27  *      vnt_control_out_u8 - Write one byte to MEM/BB/MAC/EEPROM
  28  *      vnt_control_in_u8 - Read one byte from MEM/BB/MAC/EEPROM
  29  *
  30  * Revision History:
  31  *      04-05-2004 Jerry Chen:  Initial release
  32  *      11-24-2004 Warren Hsu: Add ControlvWriteByte,ControlvReadByte,ControlvMaskByte
  33  *
  34  */
  35
  36 #include "int.h"
  37 #include "rxtx.h"
  38 #include "dpc.h"
  39 #include "desc.h"
  40 #include "device.h"
  41 #include "usbpipe.h"
  42
  43 #define USB_CTL_WAIT    500 /* ms */
  44
  45 int vnt_control_out(struct vnt_private *priv, u8 request, u16 value,
  46                 u16 index, u16 length, u8 *buffer)
  47 {
  48         int status = 0;
  49
  50         if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags))
  51                 return STATUS_FAILURE;
  52
  53         mutex_lock(&priv->usb_lock);
  54
  55         status = usb_control_msg(priv->usb,
  56                 usb_sndctrlpipe(priv->usb, 0), request, 0x40, value,
  57                         index, buffer, length, USB_CTL_WAIT);
  58
  59         mutex_unlock(&priv->usb_lock);
  60
  61         if (status < (int)length)
  62                 return STATUS_FAILURE;
  63
  64         return STATUS_SUCCESS;
  65 }
  66
  67 void vnt_control_out_u8(struct vnt_private *priv, u8 reg, u8 reg_off, u8 data)
  68 {
  69         vnt_control_out(priv, MESSAGE_TYPE_WRITE,
  70                                         reg_off, reg, sizeof(u8), &data);
  71 }
  72
  73 int vnt_control_in(struct vnt_private *priv, u8 request, u16 value,
  74                 u16 index, u16 length, u8 *buffer)
  75 {
  76         int status;
  77
  78         if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags))
  79                 return STATUS_FAILURE;
  80
  81         mutex_lock(&priv->usb_lock);
  82
  83         status = usb_control_msg(priv->usb,
  84                 usb_rcvctrlpipe(priv->usb, 0), request, 0xc0, value,
  85                         index, buffer, length, USB_CTL_WAIT);
  86
  87         mutex_unlock(&priv->usb_lock);
  88
  89         if (status < (int)length)
  90                 return STATUS_FAILURE;
  91
  92         return STATUS_SUCCESS;
  93 }
  94
  95 void vnt_control_in_u8(struct vnt_private *priv, u8 reg, u8 reg_off, u8 *data)
  96 {
  97         vnt_control_in(priv, MESSAGE_TYPE_READ,
  98                         reg_off, reg, sizeof(u8), data);
  99 }
 100
 101 static void vnt_start_interrupt_urb_complete(struct urb *urb)
 102 {
 103         struct vnt_private *priv = urb->context;
 104         int status = urb->status;
 105
 106         switch (status) {
 107         case 0:
 108         case -ETIMEDOUT:
 109                 break;
 110         case -ECONNRESET:
 111         case -ENOENT:
 112         case -ESHUTDOWN:
 113                 priv->int_buf.in_use = false;
 114                 return;
 115         default:
 116                 break;
 117         }
 118
 119         if (status) {
 120                 priv->int_buf.in_use = false;
 121
 122                 dev_dbg(&priv->usb->dev, "%s status = %d\n", __func__, status);
 123         } else {
 124                 vnt_int_process_data(priv);
 125         }
 126
 127         status = usb_submit_urb(priv->interrupt_urb, GFP_ATOMIC);
 128         if (status)
 129                 dev_dbg(&priv->usb->dev, "Submit int URB failed %d\n", status);
 130         else
 131                 priv->int_buf.in_use = true;
 132 }
 133
 134 int vnt_start_interrupt_urb(struct vnt_private *priv)
 135 {
 136         int status = STATUS_FAILURE;
 137
 138         if (priv->int_buf.in_use)
 139                 return STATUS_FAILURE;
 140
 141         priv->int_buf.in_use = true;
 142
 143         usb_fill_int_urb(priv->interrupt_urb,
 144                          priv->usb,
 145                          usb_rcvintpipe(priv->usb, 1),
 146                          priv->int_buf.data_buf,
 147                          MAX_INTERRUPT_SIZE,
 148                          vnt_start_interrupt_urb_complete,
 149                          priv,
 150                          priv->int_interval);
 151
 152         status = usb_submit_urb(priv->interrupt_urb, GFP_ATOMIC);
 153         if (status) {
 154                 dev_dbg(&priv->usb->dev, "Submit int URB failed %d\n", status);
 155                 priv->int_buf.in_use = false;
 156         }
 157
 158         return status;
 159 }
 160
 161 static void vnt_submit_rx_urb_complete(struct urb *urb)
 162 {
 163         struct vnt_rcb *rcb = urb->context;
 164         struct vnt_private *priv = rcb->priv;
 165
 166         switch (urb->status) {
 167         case 0:
 168                 break;
 169         case -ECONNRESET:
 170         case -ENOENT:
 171         case -ESHUTDOWN:
 172                 return;
 173         case -ETIMEDOUT:
 174         default:
 175                 dev_dbg(&priv->usb->dev, "BULK In failed %d\n", urb->status);
 176                 break;
 177         }
 178
 179         if (urb->actual_length) {
 180                 if (vnt_rx_data(priv, rcb, urb->actual_length)) {
 181                         rcb->skb = dev_alloc_skb(priv->rx_buf_sz);
 182                         if (!rcb->skb) {
 183                                 dev_dbg(&priv->usb->dev,
 184                                         "Failed to re-alloc rx skb\n");
 185
 186                                 rcb->in_use = false;
 187                                 return;
 188                         }
 189                 } else {
 190                         skb_push(rcb->skb, skb_headroom(rcb->skb));
 191                         skb_trim(rcb->skb, 0);
 192                 }
 193
 194                 urb->transfer_buffer = skb_put(rcb->skb,
 195                                                 skb_tailroom(rcb->skb));
 196         }
 197
 198         if (usb_submit_urb(urb, GFP_ATOMIC)) {
 199                 dev_dbg(&priv->usb->dev, "Failed to re submit rx skb\n");
 200
 201                 rcb->in_use = false;
 202         }
 203 }
 204
 205 int vnt_submit_rx_urb(struct vnt_private *priv, struct vnt_rcb *rcb)
 206 {
 207         int status = 0;
 208         struct urb *urb = rcb->urb;
 209
 210         if (!rcb->skb) {
 211                 dev_dbg(&priv->usb->dev, "rcb->skb is null\n");
 212                 return status;
 213         }
 214
 215         usb_fill_bulk_urb(urb,
 216                           priv->usb,
 217                           usb_rcvbulkpipe(priv->usb, 2),
 218                           skb_put(rcb->skb, skb_tailroom(rcb->skb)),
 219                           MAX_TOTAL_SIZE_WITH_ALL_HEADERS,
 220                           vnt_submit_rx_urb_complete,
 221                           rcb);
 222
 223         status = usb_submit_urb(urb, GFP_ATOMIC);
 224         if (status) {
 225                 dev_dbg(&priv->usb->dev, "Submit Rx URB failed %d\n", status);
 226                 return STATUS_FAILURE;
 227         }
 228
 229         rcb->in_use = true;
 230
 231         return status;
 232 }
 233
 234 static void vnt_tx_context_complete(struct urb *urb)
 235 {
 236         struct vnt_usb_send_context *context = urb->context;
 237         struct vnt_private *priv = context->priv;
 238
 239         switch (urb->status) {
 240         case 0:
 241                 dev_dbg(&priv->usb->dev, "Write %d bytes\n", context->buf_len);
 242                 break;
 243         case -ECONNRESET:
 244         case -ENOENT:
 245         case -ESHUTDOWN:
 246                 context->in_use = false;
 247                 return;
 248         case -ETIMEDOUT:
 249         default:
 250                 dev_dbg(&priv->usb->dev, "BULK Out failed %d\n", urb->status);
 251                 break;
 252         }
 253
 254         if (context->type == CONTEXT_DATA_PACKET)
 255                 ieee80211_wake_queues(priv->hw);
 256
 257         if (urb->status || context->type == CONTEXT_BEACON_PACKET) {
 258                 if (context->skb)
 259                         ieee80211_free_txskb(priv->hw, context->skb);
 260
 261                 context->in_use = false;
 262         }
 263 }
 264
 265 int vnt_tx_context(struct vnt_private *priv,
 266                    struct vnt_usb_send_context *context)
 267 {
 268         int status;
 269         struct urb *urb = context->urb;
 270
 271         if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags)) {
 272                 context->in_use = false;
 273                 return STATUS_RESOURCES;
 274         }
 275
 276         usb_fill_bulk_urb(urb,
 277                           priv->usb,
 278                           usb_sndbulkpipe(priv->usb, 3),
 279                           context->data,
 280                           context->buf_len,
 281                           vnt_tx_context_complete,
 282                           context);
 283
 284         status = usb_submit_urb(urb, GFP_ATOMIC);
 285         if (status) {
 286                 dev_dbg(&priv->usb->dev, "Submit Tx URB failed %d\n", status);
 287
 288                 context->in_use = false;
 289                 return STATUS_FAILURE;
 290         }
 291
 292         return STATUS_PENDING;
 293 }