kernel/drivers/staging/ozwpan/ozusbsvc1.c

   1 /* -----------------------------------------------------------------------------
   2  * Copyright (c) 2011 Ozmo Inc
   3  * Released under the GNU General Public License Version 2 (GPLv2).
   4  *
   5  * This file implements the protocol specific parts of the USB service for a PD.
   6  * -----------------------------------------------------------------------------
   7  */
   8 #include <linux/module.h>
   9 #include <linux/timer.h>
  10 #include <linux/sched.h>
  11 #include <linux/netdevice.h>
  12 #include <linux/errno.h>
  13 #include <linux/input.h>
  14 #include <asm/unaligned.h>
  15 #include "ozdbg.h"
  16 #include "ozprotocol.h"
  17 #include "ozeltbuf.h"
  18 #include "ozpd.h"
  19 #include "ozproto.h"
  20 #include "ozusbif.h"
  21 #include "ozhcd.h"
  22 #include "ozusbsvc.h"
  23
  24 #define MAX_ISOC_FIXED_DATA     (253-sizeof(struct oz_isoc_fixed))
  25
  26 /*
  27  * Context: softirq
  28  */
  29 static int oz_usb_submit_elt(struct oz_elt_buf *eb, struct oz_elt_info *ei,
  30         struct oz_usb_ctx *usb_ctx, u8 strid, u8 isoc)
  31 {
  32         int ret;
  33         struct oz_elt *elt = (struct oz_elt *)ei->data;
  34         struct oz_app_hdr *app_hdr = (struct oz_app_hdr *)(elt+1);
  35
  36         elt->type = OZ_ELT_APP_DATA;
  37         ei->app_id = OZ_APPID_USB;
  38         ei->length = elt->length + sizeof(struct oz_elt);
  39         app_hdr->app_id = OZ_APPID_USB;
  40         spin_lock_bh(&eb->lock);
  41         if (isoc == 0) {
  42                 app_hdr->elt_seq_num = usb_ctx->tx_seq_num++;
  43                 if (usb_ctx->tx_seq_num == 0)
  44                         usb_ctx->tx_seq_num = 1;
  45         }
  46         ret = oz_queue_elt_info(eb, isoc, strid, ei);
  47         if (ret)
  48                 oz_elt_info_free(eb, ei);
  49         spin_unlock_bh(&eb->lock);
  50         return ret;
  51 }
  52
  53 /*
  54  * Context: softirq
  55  */
  56 int oz_usb_get_desc_req(void *hpd, u8 req_id, u8 req_type, u8 desc_type,
  57         u8 index, __le16 windex, int offset, int len)
  58 {
  59         struct oz_usb_ctx *usb_ctx = hpd;
  60         struct oz_pd *pd = usb_ctx->pd;
  61         struct oz_elt *elt;
  62         struct oz_get_desc_req *body;
  63         struct oz_elt_buf *eb = &pd->elt_buff;
  64         struct oz_elt_info *ei = oz_elt_info_alloc(&pd->elt_buff);
  65
  66         oz_dbg(ON, "    req_type = 0x%x\n", req_type);
  67         oz_dbg(ON, "    desc_type = 0x%x\n", desc_type);
  68         oz_dbg(ON, "    index = 0x%x\n", index);
  69         oz_dbg(ON, "    windex = 0x%x\n", windex);
  70         oz_dbg(ON, "    offset = 0x%x\n", offset);
  71         oz_dbg(ON, "    len = 0x%x\n", len);
  72         if (len > 200)
  73                 len = 200;
  74         if (ei == NULL)
  75                 return -1;
  76         elt = (struct oz_elt *)ei->data;
  77         elt->length = sizeof(struct oz_get_desc_req);
  78         body = (struct oz_get_desc_req *)(elt+1);
  79         body->type = OZ_GET_DESC_REQ;
  80         body->req_id = req_id;
  81         put_unaligned(cpu_to_le16(offset), &body->offset);
  82         put_unaligned(cpu_to_le16(len), &body->size);
  83         body->req_type = req_type;
  84         body->desc_type = desc_type;
  85         body->w_index = windex;
  86         body->index = index;
  87         return oz_usb_submit_elt(eb, ei, usb_ctx, 0, 0);
  88 }
  89
  90 /*
  91  * Context: tasklet
  92  */
  93 static int oz_usb_set_config_req(void *hpd, u8 req_id, u8 index)
  94 {
  95         struct oz_usb_ctx *usb_ctx = hpd;
  96         struct oz_pd *pd = usb_ctx->pd;
  97         struct oz_elt *elt;
  98         struct oz_elt_buf *eb = &pd->elt_buff;
  99         struct oz_elt_info *ei = oz_elt_info_alloc(&pd->elt_buff);
 100         struct oz_set_config_req *body;
 101
 102         if (ei == NULL)
 103                 return -1;
 104         elt = (struct oz_elt *)ei->data;
 105         elt->length = sizeof(struct oz_set_config_req);
 106         body = (struct oz_set_config_req *)(elt+1);
 107         body->type = OZ_SET_CONFIG_REQ;
 108         body->req_id = req_id;
 109         body->index = index;
 110         return oz_usb_submit_elt(eb, ei, usb_ctx, 0, 0);
 111 }
 112
 113 /*
 114  * Context: tasklet
 115  */
 116 static int oz_usb_set_interface_req(void *hpd, u8 req_id, u8 index, u8 alt)
 117 {
 118         struct oz_usb_ctx *usb_ctx = hpd;
 119         struct oz_pd *pd = usb_ctx->pd;
 120         struct oz_elt *elt;
 121         struct oz_elt_buf *eb = &pd->elt_buff;
 122         struct oz_elt_info *ei = oz_elt_info_alloc(&pd->elt_buff);
 123         struct oz_set_interface_req *body;
 124
 125         if (ei == NULL)
 126                 return -1;
 127         elt = (struct oz_elt *)ei->data;
 128         elt->length = sizeof(struct oz_set_interface_req);
 129         body = (struct oz_set_interface_req *)(elt+1);
 130         body->type = OZ_SET_INTERFACE_REQ;
 131         body->req_id = req_id;
 132         body->index = index;
 133         body->alternative = alt;
 134         return oz_usb_submit_elt(eb, ei, usb_ctx, 0, 0);
 135 }
 136
 137 /*
 138  * Context: tasklet
 139  */
 140 static int oz_usb_set_clear_feature_req(void *hpd, u8 req_id, u8 type,
 141                         u8 recipient, u8 index, __le16 feature)
 142 {
 143         struct oz_usb_ctx *usb_ctx = hpd;
 144         struct oz_pd *pd = usb_ctx->pd;
 145         struct oz_elt *elt;
 146         struct oz_elt_buf *eb = &pd->elt_buff;
 147         struct oz_elt_info *ei = oz_elt_info_alloc(&pd->elt_buff);
 148         struct oz_feature_req *body;
 149
 150         if (ei == NULL)
 151                 return -1;
 152         elt = (struct oz_elt *)ei->data;
 153         elt->length = sizeof(struct oz_feature_req);
 154         body = (struct oz_feature_req *)(elt+1);
 155         body->type = type;
 156         body->req_id = req_id;
 157         body->recipient = recipient;
 158         body->index = index;
 159         put_unaligned(feature, &body->feature);
 160         return oz_usb_submit_elt(eb, ei, usb_ctx, 0, 0);
 161 }
 162
 163 /*
 164  * Context: tasklet
 165  */
 166 static int oz_usb_vendor_class_req(void *hpd, u8 req_id, u8 req_type,
 167         u8 request, __le16 value, __le16 index, const u8 *data, int data_len)
 168 {
 169         struct oz_usb_ctx *usb_ctx = hpd;
 170         struct oz_pd *pd = usb_ctx->pd;
 171         struct oz_elt *elt;
 172         struct oz_elt_buf *eb = &pd->elt_buff;
 173         struct oz_elt_info *ei = oz_elt_info_alloc(&pd->elt_buff);
 174         struct oz_vendor_class_req *body;
 175
 176         if (ei == NULL)
 177                 return -1;
 178         elt = (struct oz_elt *)ei->data;
 179         elt->length = sizeof(struct oz_vendor_class_req) - 1 + data_len;
 180         body = (struct oz_vendor_class_req *)(elt+1);
 181         body->type = OZ_VENDOR_CLASS_REQ;
 182         body->req_id = req_id;
 183         body->req_type = req_type;
 184         body->request = request;
 185         put_unaligned(value, &body->value);
 186         put_unaligned(index, &body->index);
 187         if (data_len)
 188                 memcpy(body->data, data, data_len);
 189         return oz_usb_submit_elt(eb, ei, usb_ctx, 0, 0);
 190 }
 191
 192 /*
 193  * Context: tasklet
 194  */
 195 int oz_usb_control_req(void *hpd, u8 req_id, struct usb_ctrlrequest *setup,
 196                         const u8 *data, int data_len)
 197 {
 198         unsigned wvalue = le16_to_cpu(setup->wValue);
 199         unsigned windex = le16_to_cpu(setup->wIndex);
 200         unsigned wlength = le16_to_cpu(setup->wLength);
 201         int rc = 0;
 202
 203         if ((setup->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
 204                 switch (setup->bRequest) {
 205                 case USB_REQ_GET_DESCRIPTOR:
 206                         rc = oz_usb_get_desc_req(hpd, req_id,
 207                                 setup->bRequestType, (u8)(wvalue>>8),
 208                                 (u8)wvalue, setup->wIndex, 0, wlength);
 209                         break;
 210                 case USB_REQ_SET_CONFIGURATION:
 211                         rc = oz_usb_set_config_req(hpd, req_id, (u8)wvalue);
 212                         break;
 213                 case USB_REQ_SET_INTERFACE: {
 214                                 u8 if_num = (u8)windex;
 215                                 u8 alt = (u8)wvalue;
 216
 217                                 rc = oz_usb_set_interface_req(hpd, req_id,
 218                                         if_num, alt);
 219                         }
 220                         break;
 221                 case USB_REQ_SET_FEATURE:
 222                         rc = oz_usb_set_clear_feature_req(hpd, req_id,
 223                                 OZ_SET_FEATURE_REQ,
 224                                 setup->bRequestType & 0xf, (u8)windex,
 225                                 setup->wValue);
 226                         break;
 227                 case USB_REQ_CLEAR_FEATURE:
 228                         rc = oz_usb_set_clear_feature_req(hpd, req_id,
 229                                 OZ_CLEAR_FEATURE_REQ,
 230                                 setup->bRequestType & 0xf,
 231                                 (u8)windex, setup->wValue);
 232                         break;
 233                 }
 234         } else {
 235                 rc = oz_usb_vendor_class_req(hpd, req_id, setup->bRequestType,
 236                         setup->bRequest, setup->wValue, setup->wIndex,
 237                         data, data_len);
 238         }
 239         return rc;
 240 }
 241
 242 /*
 243  * Context: softirq
 244  */
 245 int oz_usb_send_isoc(void *hpd, u8 ep_num, struct urb *urb)
 246 {
 247         struct oz_usb_ctx *usb_ctx = hpd;
 248         struct oz_pd *pd = usb_ctx->pd;
 249         struct oz_elt_buf *eb;
 250         int i;
 251         int hdr_size;
 252         u8 *data;
 253         struct usb_iso_packet_descriptor *desc;
 254
 255         if (pd->mode & OZ_F_ISOC_NO_ELTS) {
 256                 for (i = 0; i < urb->number_of_packets; i++) {
 257                         u8 *data;
 258
 259                         desc = &urb->iso_frame_desc[i];
 260                         data = ((u8 *)urb->transfer_buffer)+desc->offset;
 261                         oz_send_isoc_unit(pd, ep_num, data, desc->length);
 262                 }
 263                 return 0;
 264         }
 265
 266         hdr_size = sizeof(struct oz_isoc_fixed) - 1;
 267         eb = &pd->elt_buff;
 268         i = 0;
 269         while (i < urb->number_of_packets) {
 270                 struct oz_elt_info *ei = oz_elt_info_alloc(eb);
 271                 struct oz_elt *elt;
 272                 struct oz_isoc_fixed *body;
 273                 int unit_count;
 274                 int unit_size;
 275                 int rem;
 276
 277                 if (ei == NULL)
 278                         return -1;
 279                 rem = MAX_ISOC_FIXED_DATA;
 280                 elt = (struct oz_elt *)ei->data;
 281                 body = (struct oz_isoc_fixed *)(elt + 1);
 282                 body->type = OZ_USB_ENDPOINT_DATA;
 283                 body->endpoint = ep_num;
 284                 body->format = OZ_DATA_F_ISOC_FIXED;
 285                 unit_size = urb->iso_frame_desc[i].length;
 286                 body->unit_size = (u8)unit_size;
 287                 data = ((u8 *)(elt+1)) + hdr_size;
 288                 unit_count = 0;
 289                 while (i < urb->number_of_packets) {
 290                         desc = &urb->iso_frame_desc[i];
 291                         if ((unit_size == desc->length) &&
 292                                 (desc->length <= rem)) {
 293                                 memcpy(data, ((u8 *)urb->transfer_buffer) +
 294                                         desc->offset, unit_size);
 295                                 data += unit_size;
 296                                 rem -= unit_size;
 297                                 unit_count++;
 298                                 desc->status = 0;
 299                                 desc->actual_length = desc->length;
 300                                 i++;
 301                         } else {
 302                                 break;
 303                         }
 304                 }
 305                 elt->length = hdr_size + MAX_ISOC_FIXED_DATA - rem;
 306                 /* Store the number of units in body->frame_number for the
 307                  * moment. This field will be correctly determined before
 308                  * the element is sent. */
 309                 body->frame_number = (u8)unit_count;
 310                 oz_usb_submit_elt(eb, ei, usb_ctx, ep_num,
 311                         pd->mode & OZ_F_ISOC_ANYTIME);
 312         }
 313         return 0;
 314 }
 315
 316 /*
 317  * Context: softirq-serialized
 318  */
 319 static void oz_usb_handle_ep_data(struct oz_usb_ctx *usb_ctx,
 320         struct oz_usb_hdr *usb_hdr, int len)
 321 {
 322         struct oz_data *data_hdr = (struct oz_data *)usb_hdr;
 323
 324         switch (data_hdr->format) {
 325         case OZ_DATA_F_MULTIPLE_FIXED: {
 326                         struct oz_multiple_fixed *body =
 327                                 (struct oz_multiple_fixed *)data_hdr;
 328                         u8 *data = body->data;
 329                         unsigned int n;
 330                         if (!body->unit_size ||
 331                                 len < sizeof(struct oz_multiple_fixed) - 1)
 332                                 break;
 333                         n = (len - (sizeof(struct oz_multiple_fixed) - 1))
 334                                 / body->unit_size;
 335                         while (n--) {
 336                                 oz_hcd_data_ind(usb_ctx->hport, body->endpoint,
 337                                         data, body->unit_size);
 338                                 data += body->unit_size;
 339                         }
 340                 }
 341                 break;
 342         case OZ_DATA_F_ISOC_FIXED: {
 343                         struct oz_isoc_fixed *body =
 344                                 (struct oz_isoc_fixed *)data_hdr;
 345                         int data_len = len-sizeof(struct oz_isoc_fixed)+1;
 346                         int unit_size = body->unit_size;
 347                         u8 *data = body->data;
 348                         int count;
 349                         int i;
 350
 351                         if (!unit_size)
 352                                 break;
 353                         count = data_len/unit_size;
 354                         for (i = 0; i < count; i++) {
 355                                 oz_hcd_data_ind(usb_ctx->hport,
 356                                         body->endpoint, data, unit_size);
 357                                 data += unit_size;
 358                         }
 359                 }
 360                 break;
 361         }
 362
 363 }
 364
 365 /*
 366  * This is called when the PD has received a USB element. The type of element
 367  * is determined and is then passed to an appropriate handler function.
 368  * Context: softirq-serialized
 369  */
 370 void oz_usb_rx(struct oz_pd *pd, struct oz_elt *elt)
 371 {
 372         struct oz_usb_hdr *usb_hdr = (struct oz_usb_hdr *)(elt + 1);
 373         struct oz_usb_ctx *usb_ctx;
 374
 375         spin_lock_bh(&pd->app_lock[OZ_APPID_USB]);
 376         usb_ctx = (struct oz_usb_ctx *)pd->app_ctx[OZ_APPID_USB];
 377         if (usb_ctx)
 378                 oz_usb_get(usb_ctx);
 379         spin_unlock_bh(&pd->app_lock[OZ_APPID_USB]);
 380         if (usb_ctx == NULL)
 381                 return; /* Context has gone so nothing to do. */
 382         if (usb_ctx->stopped)
 383                 goto done;
 384         /* If sequence number is non-zero then check it is not a duplicate.
 385          * Zero sequence numbers are always accepted.
 386          */
 387         if (usb_hdr->elt_seq_num != 0) {
 388                 if (((usb_ctx->rx_seq_num - usb_hdr->elt_seq_num) & 0x80) == 0)
 389                         /* Reject duplicate element. */
 390                         goto done;
 391         }
 392         usb_ctx->rx_seq_num = usb_hdr->elt_seq_num;
 393         switch (usb_hdr->type) {
 394         case OZ_GET_DESC_RSP: {
 395                         struct oz_get_desc_rsp *body =
 396                                 (struct oz_get_desc_rsp *)usb_hdr;
 397                         u16 offs, total_size;
 398                         u8 data_len;
 399
 400                         if (elt->length < sizeof(struct oz_get_desc_rsp) - 1)
 401                                 break;
 402                         data_len = elt->length -
 403                                         (sizeof(struct oz_get_desc_rsp) - 1);
 404                         offs = le16_to_cpu(get_unaligned(&body->offset));
 405                         total_size =
 406                                 le16_to_cpu(get_unaligned(&body->total_size));
 407                         oz_dbg(ON, "USB_REQ_GET_DESCRIPTOR - cnf\n");
 408                         oz_hcd_get_desc_cnf(usb_ctx->hport, body->req_id,
 409                                         body->rcode, body->data,
 410                                         data_len, offs, total_size);
 411                 }
 412                 break;
 413         case OZ_SET_CONFIG_RSP: {
 414                         struct oz_set_config_rsp *body =
 415                                 (struct oz_set_config_rsp *)usb_hdr;
 416                         oz_hcd_control_cnf(usb_ctx->hport, body->req_id,
 417                                 body->rcode, NULL, 0);
 418                 }
 419                 break;
 420         case OZ_SET_INTERFACE_RSP: {
 421                         struct oz_set_interface_rsp *body =
 422                                 (struct oz_set_interface_rsp *)usb_hdr;
 423                         oz_hcd_control_cnf(usb_ctx->hport,
 424                                 body->req_id, body->rcode, NULL, 0);
 425                 }
 426                 break;
 427         case OZ_VENDOR_CLASS_RSP: {
 428                         struct oz_vendor_class_rsp *body =
 429                                 (struct oz_vendor_class_rsp *)usb_hdr;
 430                         oz_hcd_control_cnf(usb_ctx->hport, body->req_id,
 431                                 body->rcode, body->data, elt->length-
 432                                 sizeof(struct oz_vendor_class_rsp)+1);
 433                 }
 434                 break;
 435         case OZ_USB_ENDPOINT_DATA:
 436                 oz_usb_handle_ep_data(usb_ctx, usb_hdr, elt->length);
 437                 break;
 438         }
 439 done:
 440         oz_usb_put(usb_ctx);
 441 }
 442
 443 /*
 444  * Context: softirq, process
 445  */
 446 void oz_usb_farewell(struct oz_pd *pd, u8 ep_num, u8 *data, u8 len)
 447 {
 448         struct oz_usb_ctx *usb_ctx;
 449
 450         spin_lock_bh(&pd->app_lock[OZ_APPID_USB]);
 451         usb_ctx = (struct oz_usb_ctx *)pd->app_ctx[OZ_APPID_USB];
 452         if (usb_ctx)
 453                 oz_usb_get(usb_ctx);
 454         spin_unlock_bh(&pd->app_lock[OZ_APPID_USB]);
 455         if (usb_ctx == NULL)
 456                 return; /* Context has gone so nothing to do. */
 457         if (!usb_ctx->stopped) {
 458                 oz_dbg(ON, "Farewell indicated ep = 0x%x\n", ep_num);
 459                 oz_hcd_data_ind(usb_ctx->hport, ep_num, data, len);
 460         }
 461         oz_usb_put(usb_ctx);
 462 }