drivers/nfc/nfcmrvl/usb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Marvell NFC-over-USB driver: USB interface related functions
   4  *
   5  * Copyright (C) 2014, Marvell International Ltd.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/usb.h>
  10 #include <linux/nfc.h>
  11 #include <net/nfc/nci.h>
  12 #include <net/nfc/nci_core.h>
  13 #include "nfcmrvl.h"
  14
  15 static struct usb_device_id nfcmrvl_table[] = {
  16         { USB_DEVICE_AND_INTERFACE_INFO(0x1286, 0x2046,
  17                                         USB_CLASS_VENDOR_SPEC, 4, 1) },
  18         { }     /* Terminating entry */
  19 };
  20
  21 MODULE_DEVICE_TABLE(usb, nfcmrvl_table);
  22
  23 #define NFCMRVL_USB_BULK_RUNNING        1
  24 #define NFCMRVL_USB_SUSPENDING          2
  25
  26 struct nfcmrvl_usb_drv_data {
  27         struct usb_device *udev;
  28         struct usb_interface *intf;
  29         unsigned long flags;
  30         struct work_struct waker;
  31         struct usb_anchor tx_anchor;
  32         struct usb_anchor bulk_anchor;
  33         struct usb_anchor deferred;
  34         int tx_in_flight;
  35         /* protects tx_in_flight */
  36         spinlock_t txlock;
  37         struct usb_endpoint_descriptor *bulk_tx_ep;
  38         struct usb_endpoint_descriptor *bulk_rx_ep;
  39         int suspend_count;
  40         struct nfcmrvl_private *priv;
  41 };
  42
  43 static int nfcmrvl_inc_tx(struct nfcmrvl_usb_drv_data *drv_data)
  44 {
  45         unsigned long flags;
  46         int rv;
  47
  48         spin_lock_irqsave(&drv_data->txlock, flags);
  49         rv = test_bit(NFCMRVL_USB_SUSPENDING, &drv_data->flags);
  50         if (!rv)
  51                 drv_data->tx_in_flight++;
  52         spin_unlock_irqrestore(&drv_data->txlock, flags);
  53
  54         return rv;
  55 }
  56
  57 static void nfcmrvl_bulk_complete(struct urb *urb)
  58 {
  59         struct nfcmrvl_usb_drv_data *drv_data = urb->context;
  60         int err;
  61
  62         dev_dbg(&drv_data->udev->dev, "urb %p status %d count %d\n",
  63                 urb, urb->status, urb->actual_length);
  64
  65         if (!test_bit(NFCMRVL_NCI_RUNNING, &drv_data->flags))
  66                 return;
  67
  68         if (!urb->status) {
  69                 struct sk_buff *skb;
  70
  71                 skb = nci_skb_alloc(drv_data->priv->ndev, urb->actual_length,
  72                                     GFP_ATOMIC);
  73                 if (!skb) {
  74                         nfc_err(&drv_data->udev->dev, "failed to alloc mem\n");
  75                 } else {
  76                         skb_put_data(skb, urb->transfer_buffer,
  77                                      urb->actual_length);
  78                         if (nfcmrvl_nci_recv_frame(drv_data->priv, skb) < 0)
  79                                 nfc_err(&drv_data->udev->dev,
  80                                         "corrupted Rx packet\n");
  81                 }
  82         }
  83
  84         if (!test_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags))
  85                 return;
  86
  87         usb_anchor_urb(urb, &drv_data->bulk_anchor);
  88         usb_mark_last_busy(drv_data->udev);
  89
  90         err = usb_submit_urb(urb, GFP_ATOMIC);
  91         if (err) {
  92                 /* -EPERM: urb is being killed;
  93                  * -ENODEV: device got disconnected
  94                  */
  95                 if (err != -EPERM && err != -ENODEV)
  96                         nfc_err(&drv_data->udev->dev,
  97                                 "urb %p failed to resubmit (%d)\n", urb, -err);
  98                 usb_unanchor_urb(urb);
  99         }
 100 }
 101
 102 static int
 103 nfcmrvl_submit_bulk_urb(struct nfcmrvl_usb_drv_data *drv_data, gfp_t mem_flags)
 104 {
 105         struct urb *urb;
 106         unsigned char *buf;
 107         unsigned int pipe;
 108         int err, size = NFCMRVL_NCI_MAX_EVENT_SIZE;
 109
 110         if (!drv_data->bulk_rx_ep)
 111                 return -ENODEV;
 112
 113         urb = usb_alloc_urb(0, mem_flags);
 114         if (!urb)
 115                 return -ENOMEM;
 116
 117         buf = kmalloc(size, mem_flags);
 118         if (!buf) {
 119                 usb_free_urb(urb);
 120                 return -ENOMEM;
 121         }
 122
 123         pipe = usb_rcvbulkpipe(drv_data->udev,
 124                                drv_data->bulk_rx_ep->bEndpointAddress);
 125
 126         usb_fill_bulk_urb(urb, drv_data->udev, pipe, buf, size,
 127                           nfcmrvl_bulk_complete, drv_data);
 128
 129         urb->transfer_flags |= URB_FREE_BUFFER;
 130
 131         usb_mark_last_busy(drv_data->udev);
 132         usb_anchor_urb(urb, &drv_data->bulk_anchor);
 133
 134         err = usb_submit_urb(urb, mem_flags);
 135         if (err) {
 136                 if (err != -EPERM && err != -ENODEV)
 137                         nfc_err(&drv_data->udev->dev,
 138                                 "urb %p submission failed (%d)\n", urb, -err);
 139                 usb_unanchor_urb(urb);
 140         }
 141
 142         usb_free_urb(urb);
 143
 144         return err;
 145 }
 146
 147 static void nfcmrvl_tx_complete(struct urb *urb)
 148 {
 149         struct sk_buff *skb = urb->context;
 150         struct nci_dev *ndev = (struct nci_dev *)skb->dev;
 151         struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
 152         struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;
 153         unsigned long flags;
 154
 155         nfc_info(priv->dev, "urb %p status %d count %d\n",
 156                  urb, urb->status, urb->actual_length);
 157
 158         spin_lock_irqsave(&drv_data->txlock, flags);
 159         drv_data->tx_in_flight--;
 160         spin_unlock_irqrestore(&drv_data->txlock, flags);
 161
 162         kfree(urb->setup_packet);
 163         kfree_skb(skb);
 164 }
 165
 166 static int nfcmrvl_usb_nci_open(struct nfcmrvl_private *priv)
 167 {
 168         struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;
 169         int err;
 170
 171         err = usb_autopm_get_interface(drv_data->intf);
 172         if (err)
 173                 return err;
 174
 175         drv_data->intf->needs_remote_wakeup = 1;
 176
 177         err = nfcmrvl_submit_bulk_urb(drv_data, GFP_KERNEL);
 178         if (err)
 179                 goto failed;
 180
 181         set_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags);
 182         nfcmrvl_submit_bulk_urb(drv_data, GFP_KERNEL);
 183
 184         usb_autopm_put_interface(drv_data->intf);
 185         return 0;
 186
 187 failed:
 188         usb_autopm_put_interface(drv_data->intf);
 189         return err;
 190 }
 191
 192 static void nfcmrvl_usb_stop_traffic(struct nfcmrvl_usb_drv_data *drv_data)
 193 {
 194         usb_kill_anchored_urbs(&drv_data->bulk_anchor);
 195 }
 196
 197 static int nfcmrvl_usb_nci_close(struct nfcmrvl_private *priv)
 198 {
 199         struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;
 200         int err;
 201
 202         cancel_work_sync(&drv_data->waker);
 203
 204         clear_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags);
 205
 206         nfcmrvl_usb_stop_traffic(drv_data);
 207         usb_kill_anchored_urbs(&drv_data->tx_anchor);
 208         err = usb_autopm_get_interface(drv_data->intf);
 209         if (err)
 210                 goto failed;
 211
 212         drv_data->intf->needs_remote_wakeup = 0;
 213         usb_autopm_put_interface(drv_data->intf);
 214
 215 failed:
 216         usb_scuttle_anchored_urbs(&drv_data->deferred);
 217         return 0;
 218 }
 219
 220 static int nfcmrvl_usb_nci_send(struct nfcmrvl_private *priv,
 221                                 struct sk_buff *skb)
 222 {
 223         struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;
 224         struct urb *urb;
 225         unsigned int pipe;
 226         int err;
 227
 228         if (!drv_data->bulk_tx_ep)
 229                 return -ENODEV;
 230
 231         urb = usb_alloc_urb(0, GFP_ATOMIC);
 232         if (!urb)
 233                 return -ENOMEM;
 234
 235         pipe = usb_sndbulkpipe(drv_data->udev,
 236                                 drv_data->bulk_tx_ep->bEndpointAddress);
 237
 238         usb_fill_bulk_urb(urb, drv_data->udev, pipe, skb->data, skb->len,
 239                           nfcmrvl_tx_complete, skb);
 240
 241         err = nfcmrvl_inc_tx(drv_data);
 242         if (err) {
 243                 usb_anchor_urb(urb, &drv_data->deferred);
 244                 schedule_work(&drv_data->waker);
 245                 err = 0;
 246                 goto done;
 247         }
 248
 249         usb_anchor_urb(urb, &drv_data->tx_anchor);
 250
 251         err = usb_submit_urb(urb, GFP_ATOMIC);
 252         if (err) {
 253                 if (err != -EPERM && err != -ENODEV)
 254                         nfc_err(&drv_data->udev->dev,
 255                                 "urb %p submission failed (%d)\n", urb, -err);
 256                 kfree(urb->setup_packet);
 257                 usb_unanchor_urb(urb);
 258         } else {
 259                 usb_mark_last_busy(drv_data->udev);
 260         }
 261
 262 done:
 263         usb_free_urb(urb);
 264         return err;
 265 }
 266
 267 static struct nfcmrvl_if_ops usb_ops = {
 268         .nci_open = nfcmrvl_usb_nci_open,
 269         .nci_close = nfcmrvl_usb_nci_close,
 270         .nci_send = nfcmrvl_usb_nci_send,
 271 };
 272
 273 static void nfcmrvl_waker(struct work_struct *work)
 274 {
 275         struct nfcmrvl_usb_drv_data *drv_data =
 276                         container_of(work, struct nfcmrvl_usb_drv_data, waker);
 277         int err;
 278
 279         err = usb_autopm_get_interface(drv_data->intf);
 280         if (err)
 281                 return;
 282
 283         usb_autopm_put_interface(drv_data->intf);
 284 }
 285
 286 static int nfcmrvl_probe(struct usb_interface *intf,
 287                          const struct usb_device_id *id)
 288 {
 289         struct nfcmrvl_usb_drv_data *drv_data;
 290         struct nfcmrvl_private *priv;
 291         int i;
 292         struct usb_device *udev = interface_to_usbdev(intf);
 293         struct nfcmrvl_platform_data config;
 294
 295         /* No configuration for USB */
 296         memset(&config, 0, sizeof(config));
 297         config.reset_n_io = -EINVAL;
 298
 299         nfc_info(&udev->dev, "intf %p id %p\n", intf, id);
 300
 301         drv_data = devm_kzalloc(&intf->dev, sizeof(*drv_data), GFP_KERNEL);
 302         if (!drv_data)
 303                 return -ENOMEM;
 304
 305         for (i = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) {
 306                 struct usb_endpoint_descriptor *ep_desc;
 307
 308                 ep_desc = &intf->cur_altsetting->endpoint[i].desc;
 309
 310                 if (!drv_data->bulk_tx_ep &&
 311                     usb_endpoint_is_bulk_out(ep_desc)) {
 312                         drv_data->bulk_tx_ep = ep_desc;
 313                 } else if (!drv_data->bulk_rx_ep &&
 314                            usb_endpoint_is_bulk_in(ep_desc)) {
 315                         drv_data->bulk_rx_ep = ep_desc;
 316                 }
 317         }
 318
 319         if (!drv_data->bulk_tx_ep || !drv_data->bulk_rx_ep)
 320                 return -ENODEV;
 321
 322         drv_data->udev = udev;
 323         drv_data->intf = intf;
 324
 325         INIT_WORK(&drv_data->waker, nfcmrvl_waker);
 326         spin_lock_init(&drv_data->txlock);
 327
 328         init_usb_anchor(&drv_data->tx_anchor);
 329         init_usb_anchor(&drv_data->bulk_anchor);
 330         init_usb_anchor(&drv_data->deferred);
 331
 332         priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_USB, drv_data, &usb_ops,
 333                                         &intf->dev, &config);
 334         if (IS_ERR(priv))
 335                 return PTR_ERR(priv);
 336
 337         drv_data->priv = priv;
 338         drv_data->priv->support_fw_dnld = false;
 339
 340         usb_set_intfdata(intf, drv_data);
 341
 342         return 0;
 343 }
 344
 345 static void nfcmrvl_disconnect(struct usb_interface *intf)
 346 {
 347         struct nfcmrvl_usb_drv_data *drv_data = usb_get_intfdata(intf);
 348
 349         if (!drv_data)
 350                 return;
 351
 352         nfc_info(&drv_data->udev->dev, "intf %p\n", intf);
 353
 354         nfcmrvl_nci_unregister_dev(drv_data->priv);
 355
 356         usb_set_intfdata(drv_data->intf, NULL);
 357 }
 358
 359 #ifdef CONFIG_PM
 360 static int nfcmrvl_suspend(struct usb_interface *intf, pm_message_t message)
 361 {
 362         struct nfcmrvl_usb_drv_data *drv_data = usb_get_intfdata(intf);
 363
 364         nfc_info(&drv_data->udev->dev, "intf %p\n", intf);
 365
 366         if (drv_data->suspend_count++)
 367                 return 0;
 368
 369         spin_lock_irq(&drv_data->txlock);
 370         if (!(PMSG_IS_AUTO(message) && drv_data->tx_in_flight)) {
 371                 set_bit(NFCMRVL_USB_SUSPENDING, &drv_data->flags);
 372                 spin_unlock_irq(&drv_data->txlock);
 373         } else {
 374                 spin_unlock_irq(&drv_data->txlock);
 375                 drv_data->suspend_count--;
 376                 return -EBUSY;
 377         }
 378
 379         nfcmrvl_usb_stop_traffic(drv_data);
 380         usb_kill_anchored_urbs(&drv_data->tx_anchor);
 381
 382         return 0;
 383 }
 384
 385 static void nfcmrvl_play_deferred(struct nfcmrvl_usb_drv_data *drv_data)
 386 {
 387         struct urb *urb;
 388         int err;
 389
 390         while ((urb = usb_get_from_anchor(&drv_data->deferred))) {
 391                 err = usb_submit_urb(urb, GFP_ATOMIC);
 392                 if (err)
 393                         break;
 394
 395                 drv_data->tx_in_flight++;
 396         }
 397         usb_scuttle_anchored_urbs(&drv_data->deferred);
 398 }
 399
 400 static int nfcmrvl_resume(struct usb_interface *intf)
 401 {
 402         struct nfcmrvl_usb_drv_data *drv_data = usb_get_intfdata(intf);
 403         int err = 0;
 404
 405         nfc_info(&drv_data->udev->dev, "intf %p\n", intf);
 406
 407         if (--drv_data->suspend_count)
 408                 return 0;
 409
 410         if (!test_bit(NFCMRVL_NCI_RUNNING, &drv_data->flags))
 411                 goto done;
 412
 413         if (test_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags)) {
 414                 err = nfcmrvl_submit_bulk_urb(drv_data, GFP_NOIO);
 415                 if (err) {
 416                         clear_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags);
 417                         goto failed;
 418                 }
 419
 420                 nfcmrvl_submit_bulk_urb(drv_data, GFP_NOIO);
 421         }
 422
 423         spin_lock_irq(&drv_data->txlock);
 424         nfcmrvl_play_deferred(drv_data);
 425         clear_bit(NFCMRVL_USB_SUSPENDING, &drv_data->flags);
 426         spin_unlock_irq(&drv_data->txlock);
 427
 428         return 0;
 429
 430 failed:
 431         usb_scuttle_anchored_urbs(&drv_data->deferred);
 432 done:
 433         spin_lock_irq(&drv_data->txlock);
 434         clear_bit(NFCMRVL_USB_SUSPENDING, &drv_data->flags);
 435         spin_unlock_irq(&drv_data->txlock);
 436
 437         return err;
 438 }
 439 #endif
 440
 441 static struct usb_driver nfcmrvl_usb_driver = {
 442         .name           = "nfcmrvl",
 443         .probe          = nfcmrvl_probe,
 444         .disconnect     = nfcmrvl_disconnect,
 445 #ifdef CONFIG_PM
 446         .suspend        = nfcmrvl_suspend,
 447         .resume         = nfcmrvl_resume,
 448         .reset_resume   = nfcmrvl_resume,
 449 #endif
 450         .id_table       = nfcmrvl_table,
 451         .supports_autosuspend = 1,
 452         .disable_hub_initiated_lpm = 1,
 453         .soft_unbind = 1,
 454 };
 455 module_usb_driver(nfcmrvl_usb_driver);
 456
 457 MODULE_AUTHOR("Marvell International Ltd.");
 458 MODULE_DESCRIPTION("Marvell NFC-over-USB driver");
 459 MODULE_LICENSE("GPL v2");