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