git.sur5r.net Git - u-boot/blob - drivers/usb/emul/usb-emul-uclass.c

   1 /*
   2  * (C) Copyright 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <usb.h>
  11 #include <dm/device-internal.h>
  12
  13 DECLARE_GLOBAL_DATA_PTR;
  14
  15 static int copy_to_unicode(char *buff, int length, const char *str)
  16 {
  17         int ptr;
  18         int i;
  19
  20         if (length < 2)
  21                 return 0;
  22         buff[1] = USB_DT_STRING;
  23         for (ptr = 2, i = 0; ptr + 1 < length && *str; i++, ptr += 2) {
  24                 buff[ptr] = str[i];
  25                 buff[ptr + 1] = 0;
  26         }
  27         buff[0] = ptr;
  28
  29         return ptr;
  30 }
  31
  32 static int usb_emul_get_string(struct usb_string *strings, int index,
  33                                char *buff, int length)
  34 {
  35         if (index == 0) {
  36                 char *desc = buff;
  37
  38                 desc[0] = 4;
  39                 desc[1] = USB_DT_STRING;
  40                 desc[2] = 0x09;
  41                 desc[3] = 0x14;
  42                 return 4;
  43         } else if (strings) {
  44                 struct usb_string *ptr;
  45
  46                 for (ptr = strings; ptr->s; ptr++) {
  47                         if (ptr->id == index)
  48                                 return copy_to_unicode(buff, length, ptr->s);
  49                 }
  50         }
  51
  52         return -EINVAL;
  53 }
  54
  55 struct usb_generic_descriptor **usb_emul_find_descriptor(
  56                 struct usb_generic_descriptor **ptr, int type, int index)
  57 {
  58         debug("%s: type=%x, index=%d\n", __func__, type, index);
  59         for (; *ptr; ptr++) {
  60                 if ((*ptr)->bDescriptorType != type)
  61                         continue;
  62                 switch (type) {
  63                 case USB_DT_CONFIG: {
  64                         struct usb_config_descriptor *cdesc;
  65
  66                         cdesc = (struct usb_config_descriptor *)*ptr;
  67                         if (cdesc && cdesc->bConfigurationValue == index)
  68                                 return ptr;
  69                         break;
  70                 }
  71                 default:
  72                         return ptr;
  73                 }
  74         }
  75         debug("%s: config ptr=%p\n", __func__, *ptr);
  76
  77         return ptr;
  78 }
  79
  80 static int usb_emul_get_descriptor(struct usb_dev_platdata *plat, int value,
  81                                    void *buffer, int length)
  82 {
  83         struct usb_generic_descriptor **ptr;
  84         int type = value >> 8;
  85         int index = value & 0xff;
  86         int upto, todo;
  87
  88         debug("%s: type=%d, index=%d, plat=%p\n", __func__, type, index, plat);
  89         if (type == USB_DT_STRING) {
  90                 return usb_emul_get_string(plat->strings, index, buffer,
  91                                            length);
  92         }
  93
  94         ptr = usb_emul_find_descriptor(plat->desc_list, type, index);
  95         if (!ptr) {
  96                 debug("%s: Could not find descriptor type %d, index %d\n",
  97                       __func__, type, index);
  98                 return -ENOENT;
  99         }
 100         for (upto = 0; *ptr && upto < length; ptr++, upto += todo) {
 101                 todo = min(length - upto, (int)(*ptr)->bLength);
 102
 103                 memcpy(buffer + upto, *ptr, todo);
 104         }
 105
 106         return upto ? upto : length ? -EIO : 0;
 107 }
 108
 109 static int usb_emul_find_devnum(int devnum, int port1, struct udevice **emulp)
 110 {
 111         struct udevice *dev;
 112         struct uclass *uc;
 113         int ret;
 114
 115         *emulp = NULL;
 116         ret = uclass_get(UCLASS_USB_EMUL, &uc);
 117         if (ret)
 118                 return ret;
 119         uclass_foreach_dev(dev, uc) {
 120                 struct usb_dev_platdata *udev = dev_get_parent_platdata(dev);
 121
 122                 /*
 123                  * devnum is initialzied to zero at the beginning of the
 124                  * enumeration process in usb_setup_device(). At this
 125                  * point, udev->devnum has not been assigned to any valid
 126                  * USB address either, so we can't rely on the comparison
 127                  * result between udev->devnum and devnum to select an
 128                  * emulator device.
 129                  */
 130                 if (!devnum) {
 131                         struct usb_emul_platdata *plat;
 132
 133                         /*
 134                          * If the parent is sandbox USB controller, we are
 135                          * the root hub. And there is only one root hub
 136                          * in the system.
 137                          */
 138                         if (device_get_uclass_id(dev->parent) == UCLASS_USB) {
 139                                 debug("%s: Found emulator '%s'\n",
 140                                       __func__, dev->name);
 141                                 *emulp = dev;
 142                                 return 0;
 143                         }
 144
 145                         plat = dev_get_uclass_platdata(dev);
 146                         if (plat->port1 == port1) {
 147                                 debug("%s: Found emulator '%s', port %d\n",
 148                                       __func__, dev->name, port1);
 149                                 *emulp = dev;
 150                                 return 0;
 151                         }
 152                 } else if (udev->devnum == devnum) {
 153                         debug("%s: Found emulator '%s', addr %d\n", __func__,
 154                               dev->name, udev->devnum);
 155                         *emulp = dev;
 156                         return 0;
 157                 }
 158         }
 159
 160         debug("%s: No emulator found, addr %d\n", __func__, devnum);
 161         return -ENOENT;
 162 }
 163
 164 int usb_emul_find(struct udevice *bus, ulong pipe, int port1,
 165                   struct udevice **emulp)
 166 {
 167         int devnum = usb_pipedevice(pipe);
 168
 169         return usb_emul_find_devnum(devnum, port1, emulp);
 170 }
 171
 172 int usb_emul_find_for_dev(struct udevice *dev, struct udevice **emulp)
 173 {
 174         struct usb_dev_platdata *udev = dev_get_parent_platdata(dev);
 175
 176         return usb_emul_find_devnum(udev->devnum, 0, emulp);
 177 }
 178
 179 int usb_emul_control(struct udevice *emul, struct usb_device *udev,
 180                      unsigned long pipe, void *buffer, int length,
 181                      struct devrequest *setup)
 182 {
 183         struct dm_usb_ops *ops = usb_get_emul_ops(emul);
 184         struct usb_dev_platdata *plat;
 185         int ret;
 186
 187         /* We permit getting the descriptor before we are probed */
 188         plat = dev_get_parent_platdata(emul);
 189         if (!ops->control)
 190                 return -ENOSYS;
 191         debug("%s: dev=%s\n", __func__, emul->name);
 192         if (pipe == usb_rcvctrlpipe(udev, 0)) {
 193                 switch (setup->request) {
 194                 case USB_REQ_GET_DESCRIPTOR: {
 195                         return usb_emul_get_descriptor(plat, setup->value,
 196                                                        buffer, length);
 197                 }
 198                 default:
 199                         ret = device_probe(emul);
 200                         if (ret)
 201                                 return ret;
 202                         return ops->control(emul, udev, pipe, buffer, length,
 203                                             setup);
 204                 }
 205         } else if (pipe == usb_snddefctrl(udev)) {
 206                 switch (setup->request) {
 207                 case USB_REQ_SET_ADDRESS:
 208                         debug("   ** set address %s %d\n", emul->name,
 209                               setup->value);
 210                         plat->devnum = setup->value;
 211                         return 0;
 212                 default:
 213                         debug("requestsend =%x\n", setup->request);
 214                         break;
 215                 }
 216         } else if (pipe == usb_sndctrlpipe(udev, 0)) {
 217                 switch (setup->request) {
 218                 case USB_REQ_SET_CONFIGURATION:
 219                         plat->configno = setup->value;
 220                         return 0;
 221                 default:
 222                         ret = device_probe(emul);
 223                         if (ret)
 224                                 return ret;
 225                         return ops->control(emul, udev, pipe, buffer, length,
 226                                             setup);
 227                 }
 228         }
 229         debug("pipe=%lx\n", pipe);
 230
 231         return -EIO;
 232 }
 233
 234 int usb_emul_bulk(struct udevice *emul, struct usb_device *udev,
 235                   unsigned long pipe, void *buffer, int length)
 236 {
 237         struct dm_usb_ops *ops = usb_get_emul_ops(emul);
 238         int ret;
 239
 240         /* We permit getting the descriptor before we are probed */
 241         if (!ops->bulk)
 242                 return -ENOSYS;
 243         debug("%s: dev=%s\n", __func__, emul->name);
 244         ret = device_probe(emul);
 245         if (ret)
 246                 return ret;
 247         return ops->bulk(emul, udev, pipe, buffer, length);
 248 }
 249
 250 int usb_emul_int(struct udevice *emul, struct usb_device *udev,
 251                   unsigned long pipe, void *buffer, int length, int interval)
 252 {
 253         struct dm_usb_ops *ops = usb_get_emul_ops(emul);
 254
 255         if (!ops->interrupt)
 256                 return -ENOSYS;
 257         debug("%s: dev=%s\n", __func__, emul->name);
 258
 259         return ops->interrupt(emul, udev, pipe, buffer, length, interval);
 260 }
 261
 262 int usb_emul_setup_device(struct udevice *dev, struct usb_string *strings,
 263                           void **desc_list)
 264 {
 265         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 266         struct usb_generic_descriptor **ptr;
 267         struct usb_config_descriptor *cdesc;
 268         int upto;
 269
 270         plat->strings = strings;
 271         plat->desc_list = (struct usb_generic_descriptor **)desc_list;
 272
 273         /* Fill in wTotalLength for each configuration descriptor */
 274         ptr = plat->desc_list;
 275         for (cdesc = NULL, upto = 0; *ptr; upto += (*ptr)->bLength, ptr++) {
 276                 debug("   - upto=%d, type=%d\n", upto, (*ptr)->bDescriptorType);
 277                 if ((*ptr)->bDescriptorType == USB_DT_CONFIG) {
 278                         if (cdesc) {
 279                                 cdesc->wTotalLength = upto;
 280                                 debug("%s: config %d length %d\n", __func__,
 281                                       cdesc->bConfigurationValue,
 282                                       cdesc->bLength);
 283                         }
 284                         cdesc = (struct usb_config_descriptor *)*ptr;
 285                         upto = 0;
 286                 }
 287         }
 288         if (cdesc) {
 289                 cdesc->wTotalLength = upto;
 290                 debug("%s: config %d length %d\n", __func__,
 291                       cdesc->bConfigurationValue, cdesc->wTotalLength);
 292         }
 293
 294         return 0;
 295 }
 296
 297 UCLASS_DRIVER(usb_emul) = {
 298         .id             = UCLASS_USB_EMUL,
 299         .name           = "usb_emul",
 300         .post_bind      = dm_scan_fdt_dev,
 301         .per_device_platdata_auto_alloc_size = sizeof(struct usb_emul_platdata),
 302         .per_child_auto_alloc_size = sizeof(struct usb_device),
 303         .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
 304 };