Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/staging/gdm724x/gdm_usb.c

  1 /*
  2  * Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved.
  3  *
  4  * This software is licensed under the terms of the GNU General Public
  5  * License version 2, as published by the Free Software Foundation, and
  6  * may be copied, distributed, and modified under those terms.
  7  *
  8  * This program is distributed in the hope that it will be useful,
  9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 11  * GNU General Public License for more details.
 12  */
 13 
 14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 15 
 16 #include <linux/module.h>
 17 #include <linux/kernel.h>
 18 #include <linux/usb.h>
 19 #include <linux/sched.h>
 20 #include <linux/kthread.h>
 21 #include <linux/usb/cdc.h>
 22 #include <linux/wait.h>
 23 #include <linux/if_ether.h>
 24 #include <linux/pm_runtime.h>
 25 
 26 #include "gdm_usb.h"
 27 #include "gdm_lte.h"
 28 #include "hci.h"
 29 #include "hci_packet.h"
 30 #include "gdm_endian.h"
 31 
 32 #define USB_DEVICE_CDC_DATA(vid, pid) \
 33         .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
 34                 USB_DEVICE_ID_MATCH_INT_CLASS | \
 35                 USB_DEVICE_ID_MATCH_INT_SUBCLASS,\
 36         .idVendor = vid,\
 37         .idProduct = pid,\
 38         .bInterfaceClass = USB_CLASS_COMM,\
 39         .bInterfaceSubClass = USB_CDC_SUBCLASS_ETHERNET
 40 
 41 #define USB_DEVICE_MASS_DATA(vid, pid) \
 42         .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
 43                 USB_DEVICE_ID_MATCH_INT_INFO,\
 44         .idVendor = vid,\
 45         .idProduct = pid,\
 46         .bInterfaceSubClass = USB_SC_SCSI, \
 47         .bInterfaceClass = USB_CLASS_MASS_STORAGE,\
 48         .bInterfaceProtocol = USB_PR_BULK
 49 
 50 static const struct usb_device_id id_table[] = {
 51         { USB_DEVICE_CDC_DATA(VID_GCT, PID_GDM7240) }, /* GCT GDM7240 */
 52         { USB_DEVICE_CDC_DATA(VID_GCT, PID_GDM7243) }, /* GCT GDM7243 */
 53         { }
 54 };
 55 
 56 MODULE_DEVICE_TABLE(usb, id_table);
 57 
 58 static struct workqueue_struct *usb_tx_wq;
 59 static struct workqueue_struct *usb_rx_wq;
 60 
 61 static void do_tx(struct work_struct *work);
 62 static void do_rx(struct work_struct *work);
 63 
 64 static int gdm_usb_recv(void *priv_dev,
 65                         int (*cb)(void *cb_data,
 66                                 void *data, int len, int context),
 67                         void *cb_data,
 68                         int context);
 69 
 70 static int request_mac_address(struct lte_udev *udev)
 71 {
 72         u8 buf[16] = {0,};
 73         struct hci_packet *hci = (struct hci_packet *)buf;
 74         struct usb_device *usbdev = udev->usbdev;
 75         int actual;
 76         int ret = -1;
 77 
 78         hci->cmd_evt = gdm_cpu_to_dev16(&udev->gdm_ed, LTE_GET_INFORMATION);
 79         hci->len = gdm_cpu_to_dev16(&udev->gdm_ed, 1);
 80         hci->data[0] = MAC_ADDRESS;
 81 
 82         ret = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 2), buf, 5,
 83                      &actual, 1000);
 84 
 85         udev->request_mac_addr = 1;
 86 
 87         return ret;
 88 }
 89 
 90 static struct usb_tx *alloc_tx_struct(int len)
 91 {
 92         struct usb_tx *t = NULL;
 93         int ret = 0;
 94 
 95         t = kzalloc(sizeof(struct usb_tx), GFP_ATOMIC);
 96         if (!t) {
 97                 ret = -ENOMEM;
 98                 goto out;
 99         }
100 
101         t->urb = usb_alloc_urb(0, GFP_ATOMIC);
102         if (!(len % 512))
103                 len++;
104 
105         t->buf = kmalloc(len, GFP_ATOMIC);
106         if (!t->urb || !t->buf) {
107                 ret = -ENOMEM;
108                 goto out;
109         }
110 
111 out:
112         if (ret < 0) {
113                 if (t) {
114                         usb_free_urb(t->urb);
115                         kfree(t->buf);
116                         kfree(t);
117                 }
118                 return NULL;
119         }
120 
121         return t;
122 }
123 
124 static struct usb_tx_sdu *alloc_tx_sdu_struct(void)
125 {
126         struct usb_tx_sdu *t_sdu;
127 
128         t_sdu = kzalloc(sizeof(struct usb_tx_sdu), GFP_ATOMIC);
129         if (!t_sdu)
130                 return NULL;
131 
132         t_sdu->buf = kmalloc(SDU_BUF_SIZE, GFP_ATOMIC);
133         if (!t_sdu->buf) {
134                 kfree(t_sdu);
135                 return NULL;
136         }
137 
138         return t_sdu;
139 }
140 
141 static void free_tx_struct(struct usb_tx *t)
142 {
143         if (t) {
144                 usb_free_urb(t->urb);
145                 kfree(t->buf);
146                 kfree(t);
147         }
148 }
149 
150 static void free_tx_sdu_struct(struct usb_tx_sdu *t_sdu)
151 {
152         if (t_sdu) {
153                 kfree(t_sdu->buf);
154                 kfree(t_sdu);
155         }
156 }
157 
158 static struct usb_tx_sdu *get_tx_sdu_struct(struct tx_cxt *tx, int *no_spc)
159 {
160         struct usb_tx_sdu *t_sdu;
161 
162         if (list_empty(&tx->free_list))
163                 return NULL;
164 
165         t_sdu = list_entry(tx->free_list.next, struct usb_tx_sdu, list);
166         list_del(&t_sdu->list);
167 
168         tx->avail_count--;
169 
170         *no_spc = list_empty(&tx->free_list) ? 1 : 0;
171 
172         return t_sdu;
173 }
174 
175 static void put_tx_struct(struct tx_cxt *tx, struct usb_tx_sdu *t_sdu)
176 {
177         list_add_tail(&t_sdu->list, &tx->free_list);
178         tx->avail_count++;
179 }
180 
181 static struct usb_rx *alloc_rx_struct(void)
182 {
183         struct usb_rx *r = NULL;
184         int ret = 0;
185 
186         r = kmalloc(sizeof(struct usb_rx), GFP_ATOMIC);
187         if (!r) {
188                 ret = -ENOMEM;
189                 goto out;
190         }
191 
192         r->urb = usb_alloc_urb(0, GFP_ATOMIC);
193         r->buf = kmalloc(RX_BUF_SIZE, GFP_ATOMIC);
194         if (!r->urb || !r->buf) {
195                 ret = -ENOMEM;
196                 goto out;
197         }
198 out:
199 
200         if (ret < 0) {
201                 if (r) {
202                         usb_free_urb(r->urb);
203                         kfree(r->buf);
204                         kfree(r);
205                 }
206                 return NULL;
207         }
208 
209         return r;
210 }
211 
212 static void free_rx_struct(struct usb_rx *r)
213 {
214         if (r) {
215                 usb_free_urb(r->urb);
216                 kfree(r->buf);
217                 kfree(r);
218         }
219 }
220 
221 static struct usb_rx *get_rx_struct(struct rx_cxt *rx, int *no_spc)
222 {
223         struct usb_rx *r;
224         unsigned long flags;
225 
226         spin_lock_irqsave(&rx->rx_lock, flags);
227 
228         if (list_empty(&rx->free_list)) {
229                 spin_unlock_irqrestore(&rx->rx_lock, flags);
230                 return NULL;
231         }
232 
233         r = list_entry(rx->free_list.next, struct usb_rx, free_list);
234         list_del(&r->free_list);
235 
236         rx->avail_count--;
237 
238         *no_spc = list_empty(&rx->free_list) ? 1 : 0;
239 
240         spin_unlock_irqrestore(&rx->rx_lock, flags);
241 
242         return r;
243 }
244 
245 static void put_rx_struct(struct rx_cxt *rx, struct usb_rx *r)
246 {
247         unsigned long flags;
248 
249         spin_lock_irqsave(&rx->rx_lock, flags);
250 
251         list_add_tail(&r->free_list, &rx->free_list);
252         rx->avail_count++;
253 
254         spin_unlock_irqrestore(&rx->rx_lock, flags);
255 }
256 
257 static void release_usb(struct lte_udev *udev)
258 {
259         struct rx_cxt   *rx = &udev->rx;
260         struct tx_cxt   *tx = &udev->tx;
261         struct usb_tx   *t, *t_next;
262         struct usb_rx   *r, *r_next;
263         struct usb_tx_sdu       *t_sdu, *t_sdu_next;
264         unsigned long flags;
265 
266         spin_lock_irqsave(&tx->lock, flags);
267         list_for_each_entry_safe(t_sdu, t_sdu_next, &tx->sdu_list, list)
268         {
269                 list_del(&t_sdu->list);
270                 free_tx_sdu_struct(t_sdu);
271         }
272 
273         list_for_each_entry_safe(t, t_next, &tx->hci_list, list)
274         {
275                 list_del(&t->list);
276                 free_tx_struct(t);
277         }
278 
279         list_for_each_entry_safe(t_sdu, t_sdu_next, &tx->free_list, list)
280         {
281                 list_del(&t_sdu->list);
282                 free_tx_sdu_struct(t_sdu);
283         }
284         spin_unlock_irqrestore(&tx->lock, flags);
285 
286         spin_lock_irqsave(&rx->submit_lock, flags);
287         list_for_each_entry_safe(r, r_next, &rx->rx_submit_list, rx_submit_list)
288         {
289                 spin_unlock_irqrestore(&rx->submit_lock, flags);
290                 usb_kill_urb(r->urb);
291                 spin_lock_irqsave(&rx->submit_lock, flags);
292         }
293         spin_unlock_irqrestore(&rx->submit_lock, flags);
294 
295         spin_lock_irqsave(&rx->rx_lock, flags);
296         list_for_each_entry_safe(r, r_next, &rx->free_list, free_list)
297         {
298                 list_del(&r->free_list);
299                 free_rx_struct(r);
300         }
301         spin_unlock_irqrestore(&rx->rx_lock, flags);
302 
303         spin_lock_irqsave(&rx->to_host_lock, flags);
304         list_for_each_entry_safe(r, r_next, &rx->to_host_list, to_host_list)
305         {
306                 if (r->index == (void *)udev) {
307                         list_del(&r->to_host_list);
308                         free_rx_struct(r);
309                 }
310         }
311         spin_unlock_irqrestore(&rx->to_host_lock, flags);
312 }
313 
314 static int init_usb(struct lte_udev *udev)
315 {
316         int ret = 0;
317         int i;
318         struct tx_cxt *tx = &udev->tx;
319         struct rx_cxt *rx = &udev->rx;
320         struct usb_tx_sdu *t_sdu = NULL;
321         struct usb_rx *r = NULL;
322 
323         udev->send_complete = 1;
324         udev->tx_stop = 0;
325         udev->request_mac_addr = 0;
326         udev->usb_state = PM_NORMAL;
327 
328         INIT_LIST_HEAD(&tx->sdu_list);
329         INIT_LIST_HEAD(&tx->hci_list);
330         INIT_LIST_HEAD(&tx->free_list);
331         INIT_LIST_HEAD(&rx->rx_submit_list);
332         INIT_LIST_HEAD(&rx->free_list);
333         INIT_LIST_HEAD(&rx->to_host_list);
334         spin_lock_init(&tx->lock);
335         spin_lock_init(&rx->rx_lock);
336         spin_lock_init(&rx->submit_lock);
337         spin_lock_init(&rx->to_host_lock);
338 
339         tx->avail_count = 0;
340         rx->avail_count = 0;
341 
342         udev->rx_cb = NULL;
343 
344         for (i = 0; i < MAX_NUM_SDU_BUF; i++) {
345                 t_sdu = alloc_tx_sdu_struct();
346                 if (t_sdu == NULL) {
347                         ret = -ENOMEM;
348                         goto fail;
349                 }
350 
351                 list_add(&t_sdu->list, &tx->free_list);
352                 tx->avail_count++;
353         }
354 
355         for (i = 0; i < MAX_RX_SUBMIT_COUNT*2; i++) {
356                 r = alloc_rx_struct();
357                 if (r == NULL) {
358                         ret = -ENOMEM;
359                         goto fail;
360                 }
361 
362                 list_add(&r->free_list, &rx->free_list);
363                 rx->avail_count++;
364         }
365         INIT_DELAYED_WORK(&udev->work_tx, do_tx);
366         INIT_DELAYED_WORK(&udev->work_rx, do_rx);
367         return 0;
368 fail:
369         return ret;
370 }
371 
372 static int set_mac_address(u8 *data, void *arg)
373 {
374         struct phy_dev *phy_dev = (struct phy_dev *)arg;
375         struct lte_udev *udev = phy_dev->priv_dev;
376         struct tlv *tlv = (struct tlv *)data;
377         u8 mac_address[ETH_ALEN] = {0, };
378 
379         if (tlv->type == MAC_ADDRESS && udev->request_mac_addr) {
380                 memcpy(mac_address, tlv->data, tlv->len);
381 
382                 if (register_lte_device(phy_dev,
383                                 &udev->intf->dev, mac_address) < 0)
384                         pr_err("register lte device failed\n");
385 
386                 udev->request_mac_addr = 0;
387 
388                 return 1;
389         }
390 
391         return 0;
392 }
393 
394 static void do_rx(struct work_struct *work)
395 {
396         struct lte_udev *udev =
397                 container_of(work, struct lte_udev, work_rx.work);
398         struct rx_cxt *rx = &udev->rx;
399         struct usb_rx *r;
400         struct hci_packet *hci;
401         struct phy_dev *phy_dev;
402         u16 cmd_evt;
403         int ret;
404         unsigned long flags;
405 
406         while (1) {
407                 spin_lock_irqsave(&rx->to_host_lock, flags);
408                 if (list_empty(&rx->to_host_list)) {
409                         spin_unlock_irqrestore(&rx->to_host_lock, flags);
410                         break;
411                 }
412                 r = list_entry(rx->to_host_list.next,
413                         struct usb_rx, to_host_list);
414                 list_del(&r->to_host_list);
415                 spin_unlock_irqrestore(&rx->to_host_lock, flags);
416 
417                 phy_dev = (struct phy_dev *)r->cb_data;
418                 udev = (struct lte_udev *)phy_dev->priv_dev;
419                 hci = (struct hci_packet *)r->buf;
420                 cmd_evt = gdm_dev16_to_cpu(&udev->gdm_ed, hci->cmd_evt);
421 
422                 switch (cmd_evt) {
423                 case LTE_GET_INFORMATION_RESULT:
424                         if (set_mac_address(hci->data, r->cb_data) == 0) {
425                                 ret = r->callback(r->cb_data,
426                                                   r->buf,
427                                                   r->urb->actual_length,
428                                                   KERNEL_THREAD);
429                         }
430                         break;
431 
432                 default:
433                         if (r->callback) {
434                                 ret = r->callback(r->cb_data,
435                                                   r->buf,
436                                                   r->urb->actual_length,
437                                                   KERNEL_THREAD);
438 
439                                 if (ret == -EAGAIN)
440                                         pr_err("failed to send received data\n");
441                         }
442                         break;
443                 }
444 
445                 put_rx_struct(rx, r);
446 
447                 gdm_usb_recv(udev,
448                              r->callback,
449                              r->cb_data,
450                              USB_COMPLETE);
451         }
452 }
453 
454 static void remove_rx_submit_list(struct usb_rx *r, struct rx_cxt *rx)
455 {
456         unsigned long flags;
457         struct usb_rx   *r_remove, *r_remove_next;
458 
459         spin_lock_irqsave(&rx->submit_lock, flags);
460         list_for_each_entry_safe(r_remove,
461                         r_remove_next, &rx->rx_submit_list, rx_submit_list)
462         {
463                 if (r == r_remove) {
464                         list_del(&r->rx_submit_list);
465                         break;
466                 }
467         }
468         spin_unlock_irqrestore(&rx->submit_lock, flags);
469 }
470 
471 static void gdm_usb_rcv_complete(struct urb *urb)
472 {
473         struct usb_rx *r = urb->context;
474         struct rx_cxt *rx = r->rx;
475         unsigned long flags;
476         struct lte_udev *udev = container_of(r->rx, struct lte_udev, rx);
477         struct usb_device *usbdev = udev->usbdev;
478 
479         remove_rx_submit_list(r, rx);
480 
481         if (!urb->status && r->callback) {
482                 spin_lock_irqsave(&rx->to_host_lock, flags);
483                 list_add_tail(&r->to_host_list, &rx->to_host_list);
484                 queue_work(usb_rx_wq, &udev->work_rx.work);
485                 spin_unlock_irqrestore(&rx->to_host_lock, flags);
486         } else {
487                 if (urb->status && udev->usb_state == PM_NORMAL)
488                         pr_err("%s: urb status error %d\n",
489                                __func__, urb->status);
490 
491                 put_rx_struct(rx, r);
492         }
493 
494         usb_mark_last_busy(usbdev);
495 }
496 
497 static int gdm_usb_recv(void *priv_dev,
498                         int (*cb)(void *cb_data,
499                                 void *data, int len, int context),
500                         void *cb_data,
501                         int context)
502 {
503         struct lte_udev *udev = priv_dev;
504         struct usb_device *usbdev = udev->usbdev;
505         struct rx_cxt *rx = &udev->rx;
506         struct usb_rx *r;
507         int no_spc;
508         int ret;
509         unsigned long flags;
510 
511         if (!udev->usbdev) {
512                 pr_err("invalid device\n");
513                 return -ENODEV;
514         }
515 
516         r = get_rx_struct(rx, &no_spc);
517         if (!r) {
518                 pr_err("Out of Memory\n");
519                 return -ENOMEM;
520         }
521 
522         udev->rx_cb = cb;
523         r->callback = cb;
524         r->cb_data = cb_data;
525         r->index = (void *)udev;
526         r->rx = rx;
527 
528         usb_fill_bulk_urb(r->urb,
529                           usbdev,
530                           usb_rcvbulkpipe(usbdev, 0x83),
531                           r->buf,
532                           RX_BUF_SIZE,
533                           gdm_usb_rcv_complete,
534                           r);
535 
536         spin_lock_irqsave(&rx->submit_lock, flags);
537         list_add_tail(&r->rx_submit_list, &rx->rx_submit_list);
538         spin_unlock_irqrestore(&rx->submit_lock, flags);
539 
540         if (context == KERNEL_THREAD)
541                 ret = usb_submit_urb(r->urb, GFP_KERNEL);
542         else
543                 ret = usb_submit_urb(r->urb, GFP_ATOMIC);
544 
545         if (ret) {
546                 spin_lock_irqsave(&rx->submit_lock, flags);
547                 list_del(&r->rx_submit_list);
548                 spin_unlock_irqrestore(&rx->submit_lock, flags);
549 
550                 pr_err("usb_submit_urb failed (%p)\n", r);
551                 put_rx_struct(rx, r);
552         }
553 
554         return ret;
555 }
556 
557 static void gdm_usb_send_complete(struct urb *urb)
558 {
559         struct usb_tx *t = urb->context;
560         struct tx_cxt *tx = t->tx;
561         struct lte_udev *udev = container_of(tx, struct lte_udev, tx);
562         unsigned long flags;
563 
564         if (urb->status == -ECONNRESET) {
565                 pr_info("CONNRESET\n");
566                 return;
567         }
568 
569         if (t->callback)
570                 t->callback(t->cb_data);
571 
572         free_tx_struct(t);
573 
574         spin_lock_irqsave(&tx->lock, flags);
575         udev->send_complete = 1;
576         queue_work(usb_tx_wq, &udev->work_tx.work);
577         spin_unlock_irqrestore(&tx->lock, flags);
578 }
579 
580 static int send_tx_packet(struct usb_device *usbdev, struct usb_tx *t, u32 len)
581 {
582         int ret = 0;
583 
584         if (!(len%512))
585                 len++;
586 
587         usb_fill_bulk_urb(t->urb,
588                           usbdev,
589                           usb_sndbulkpipe(usbdev, 2),
590                           t->buf,
591                           len,
592                           gdm_usb_send_complete,
593                           t);
594 
595         ret = usb_submit_urb(t->urb, GFP_ATOMIC);
596 
597         if (ret)
598                 pr_err("usb_submit_urb failed: %d\n", ret);
599 
600         usb_mark_last_busy(usbdev);
601 
602         return ret;
603 }
604 
605 static u32 packet_aggregation(struct lte_udev *udev, u8 *send_buf)
606 {
607         struct tx_cxt *tx = &udev->tx;
608         struct usb_tx_sdu *t_sdu = NULL;
609         struct multi_sdu *multi_sdu = (struct multi_sdu *)send_buf;
610         u16 send_len = 0;
611         u16 num_packet = 0;
612         unsigned long flags;
613 
614         multi_sdu->cmd_evt = gdm_cpu_to_dev16(&udev->gdm_ed, LTE_TX_MULTI_SDU);
615 
616         while (num_packet < MAX_PACKET_IN_MULTI_SDU) {
617                 spin_lock_irqsave(&tx->lock, flags);
618                 if (list_empty(&tx->sdu_list)) {
619                         spin_unlock_irqrestore(&tx->lock, flags);
620                         break;
621                 }
622 
623                 t_sdu = list_entry(tx->sdu_list.next, struct usb_tx_sdu, list);
624                 if (send_len + t_sdu->len > MAX_SDU_SIZE) {
625                         spin_unlock_irqrestore(&tx->lock, flags);
626                         break;
627                 }
628 
629                 list_del(&t_sdu->list);
630                 spin_unlock_irqrestore(&tx->lock, flags);
631 
632                 memcpy(multi_sdu->data + send_len, t_sdu->buf, t_sdu->len);
633 
634                 send_len += (t_sdu->len + 3) & 0xfffc;
635                 num_packet++;
636 
637                 if (tx->avail_count > 10)
638                         t_sdu->callback(t_sdu->cb_data);
639 
640                 spin_lock_irqsave(&tx->lock, flags);
641                 put_tx_struct(tx, t_sdu);
642                 spin_unlock_irqrestore(&tx->lock, flags);
643         }
644 
645         multi_sdu->len = gdm_cpu_to_dev16(&udev->gdm_ed, send_len);
646         multi_sdu->num_packet = gdm_cpu_to_dev16(&udev->gdm_ed, num_packet);
647 
648         return send_len + offsetof(struct multi_sdu, data);
649 }
650 
651 static void do_tx(struct work_struct *work)
652 {
653         struct lte_udev *udev =
654                 container_of(work, struct lte_udev, work_tx.work);
655         struct usb_device *usbdev = udev->usbdev;
656         struct tx_cxt *tx = &udev->tx;
657         struct usb_tx *t = NULL;
658         int is_send = 0;
659         u32 len = 0;
660         unsigned long flags;
661 
662         if (!usb_autopm_get_interface(udev->intf))
663                 usb_autopm_put_interface(udev->intf);
664 
665         if (udev->usb_state == PM_SUSPEND)
666                 return;
667 
668         spin_lock_irqsave(&tx->lock, flags);
669         if (!udev->send_complete) {
670                 spin_unlock_irqrestore(&tx->lock, flags);
671                 return;
672         } else {
673                 udev->send_complete = 0;
674         }
675 
676         if (!list_empty(&tx->hci_list)) {
677                 t = list_entry(tx->hci_list.next, struct usb_tx, list);
678                 list_del(&t->list);
679                 len = t->len;
680                 t->is_sdu = 0;
681                 is_send = 1;
682         } else if (!list_empty(&tx->sdu_list)) {
683                 if (udev->tx_stop) {
684                         udev->send_complete = 1;
685                         spin_unlock_irqrestore(&tx->lock, flags);
686                         return;
687                 }
688 
689                 t = alloc_tx_struct(TX_BUF_SIZE);
690                 t->callback = NULL;
691                 t->tx = tx;
692                 t->is_sdu = 1;
693                 is_send = 1;
694         }
695 
696         if (!is_send) {
697                 udev->send_complete = 1;
698                 spin_unlock_irqrestore(&tx->lock, flags);
699                 return;
700         }
701         spin_unlock_irqrestore(&tx->lock, flags);
702 
703         if (t->is_sdu)
704                 len = packet_aggregation(udev, t->buf);
705 
706         if (send_tx_packet(usbdev, t, len)) {
707                 pr_err("send_tx_packet failed\n");
708                 t->callback = NULL;
709                 gdm_usb_send_complete(t->urb);
710         }
711 }
712 
713 #define SDU_PARAM_LEN 12
714 static int gdm_usb_sdu_send(void *priv_dev, void *data, int len,
715                                 unsigned int dftEpsId, unsigned int epsId,
716                                 void (*cb)(void *data), void *cb_data,
717                             int dev_idx, int nic_type)
718 {
719         struct lte_udev *udev = priv_dev;
720         struct tx_cxt *tx = &udev->tx;
721         struct usb_tx_sdu *t_sdu;
722         struct sdu *sdu = NULL;
723         unsigned long flags;
724         int no_spc = 0;
725         u16 send_len;
726 
727         if (!udev->usbdev) {
728                 pr_err("sdu send - invalid device\n");
729                 return TX_NO_DEV;
730         }
731 
732         spin_lock_irqsave(&tx->lock, flags);
733         t_sdu = get_tx_sdu_struct(tx, &no_spc);
734         spin_unlock_irqrestore(&tx->lock, flags);
735 
736         if (t_sdu == NULL) {
737                 pr_err("sdu send - free list empty\n");
738                 return TX_NO_SPC;
739         }
740 
741         sdu = (struct sdu *)t_sdu->buf;
742         sdu->cmd_evt = gdm_cpu_to_dev16(&udev->gdm_ed, LTE_TX_SDU);
743         if (nic_type == NIC_TYPE_ARP) {
744                 send_len = len + SDU_PARAM_LEN;
745             memcpy(sdu->data, data, len);
746         } else {
747             send_len = len - ETH_HLEN;
748             send_len += SDU_PARAM_LEN;
749             memcpy(sdu->data, data+ETH_HLEN, len-ETH_HLEN);
750         }
751 
752         sdu->len = gdm_cpu_to_dev16(&udev->gdm_ed, send_len);
753         sdu->dftEpsId = gdm_cpu_to_dev32(&udev->gdm_ed, dftEpsId);
754         sdu->bearer_ID = gdm_cpu_to_dev32(&udev->gdm_ed, epsId);
755         sdu->nic_type = gdm_cpu_to_dev32(&udev->gdm_ed, nic_type);
756 
757         t_sdu->len = send_len + HCI_HEADER_SIZE;
758         t_sdu->callback = cb;
759         t_sdu->cb_data = cb_data;
760 
761         spin_lock_irqsave(&tx->lock, flags);
762         list_add_tail(&t_sdu->list, &tx->sdu_list);
763         queue_work(usb_tx_wq, &udev->work_tx.work);
764         spin_unlock_irqrestore(&tx->lock, flags);
765 
766         if (no_spc)
767                 return TX_NO_BUFFER;
768 
769         return 0;
770 }
771 
772 static int gdm_usb_hci_send(void *priv_dev, void *data, int len,
773                         void (*cb)(void *data), void *cb_data)
774 {
775         struct lte_udev *udev = priv_dev;
776         struct tx_cxt *tx = &udev->tx;
777         struct usb_tx *t;
778         unsigned long flags;
779 
780         if (!udev->usbdev) {
781                 pr_err("hci send - invalid device\n");
782                 return -ENODEV;
783         }
784 
785         t = alloc_tx_struct(len);
786         if (t == NULL) {
787                 pr_err("hci_send - out of memory\n");
788                 return -ENOMEM;
789         }
790 
791         memcpy(t->buf, data, len);
792         t->callback = cb;
793         t->cb_data = cb_data;
794         t->len = len;
795         t->tx = tx;
796         t->is_sdu = 0;
797 
798         spin_lock_irqsave(&tx->lock, flags);
799         list_add_tail(&t->list, &tx->hci_list);
800         queue_work(usb_tx_wq, &udev->work_tx.work);
801         spin_unlock_irqrestore(&tx->lock, flags);
802 
803         return 0;
804 }
805 
806 static struct gdm_endian *gdm_usb_get_endian(void *priv_dev)
807 {
808         struct lte_udev *udev = priv_dev;
809 
810         return &udev->gdm_ed;
811 }
812 
813 static int gdm_usb_probe(struct usb_interface *intf,
814         const struct usb_device_id *id)
815 {
816         int ret = 0;
817         struct phy_dev *phy_dev = NULL;
818         struct lte_udev *udev = NULL;
819         u16 idVendor, idProduct;
820         int bInterfaceNumber;
821         struct usb_device *usbdev = interface_to_usbdev(intf);
822 
823         bInterfaceNumber = intf->cur_altsetting->desc.bInterfaceNumber;
824         idVendor = __le16_to_cpu(usbdev->descriptor.idVendor);
825         idProduct = __le16_to_cpu(usbdev->descriptor.idProduct);
826 
827         pr_info("net vid = 0x%04x pid = 0x%04x\n", idVendor, idProduct);
828 
829         if (bInterfaceNumber > NETWORK_INTERFACE) {
830                 pr_info("not a network device\n");
831                 return -ENODEV;
832         }
833 
834         phy_dev = kzalloc(sizeof(struct phy_dev), GFP_KERNEL);
835         if (!phy_dev)
836                 return -ENOMEM;
837 
838         udev = kzalloc(sizeof(struct lte_udev), GFP_KERNEL);
839         if (!udev) {
840                 ret = -ENOMEM;
841                 goto err_udev;
842         }
843 
844         phy_dev->priv_dev = (void *)udev;
845         phy_dev->send_hci_func = gdm_usb_hci_send;
846         phy_dev->send_sdu_func = gdm_usb_sdu_send;
847         phy_dev->rcv_func = gdm_usb_recv;
848         phy_dev->get_endian = gdm_usb_get_endian;
849 
850         udev->usbdev = usbdev;
851         ret = init_usb(udev);
852         if (ret < 0) {
853                 pr_err("init_usb func failed\n");
854                 goto err_init_usb;
855         }
856         udev->intf = intf;
857 
858         intf->needs_remote_wakeup = 1;
859         usb_enable_autosuspend(usbdev);
860         pm_runtime_set_autosuspend_delay(&usbdev->dev, AUTO_SUSPEND_TIMER);
861 
862         /* List up hosts with big endians, otherwise,
863          * defaults to little endian
864          */
865         if (idProduct == PID_GDM7243)
866                 gdm_set_endian(&udev->gdm_ed, ENDIANNESS_BIG);
867         else
868                 gdm_set_endian(&udev->gdm_ed, ENDIANNESS_LITTLE);
869 
870         ret = request_mac_address(udev);
871         if (ret < 0) {
872                 pr_err("request Mac address failed\n");
873                 goto err_mac_address;
874         }
875 
876         start_rx_proc(phy_dev);
877         usb_get_dev(usbdev);
878         usb_set_intfdata(intf, phy_dev);
879 
880         return 0;
881 
882 err_mac_address:
883         release_usb(udev);
884 err_init_usb:
885         kfree(udev);
886 err_udev:
887         kfree(phy_dev);
888 
889         return ret;
890 }
891 
892 static void gdm_usb_disconnect(struct usb_interface *intf)
893 {
894         struct phy_dev *phy_dev;
895         struct lte_udev *udev;
896         u16 idVendor, idProduct;
897         struct usb_device *usbdev;
898         usbdev = interface_to_usbdev(intf);
899 
900         idVendor = __le16_to_cpu(usbdev->descriptor.idVendor);
901         idProduct = __le16_to_cpu(usbdev->descriptor.idProduct);
902 
903         phy_dev = usb_get_intfdata(intf);
904 
905         udev = phy_dev->priv_dev;
906         unregister_lte_device(phy_dev);
907 
908         release_usb(udev);
909 
910         kfree(udev);
911         udev = NULL;
912 
913         kfree(phy_dev);
914         phy_dev = NULL;
915 
916         usb_put_dev(usbdev);
917 }
918 
919 static int gdm_usb_suspend(struct usb_interface *intf, pm_message_t pm_msg)
920 {
921         struct phy_dev *phy_dev;
922         struct lte_udev *udev;
923         struct rx_cxt *rx;
924         struct usb_rx *r;
925         struct usb_rx *r_next;
926         unsigned long flags;
927 
928         phy_dev = usb_get_intfdata(intf);
929         udev = phy_dev->priv_dev;
930         rx = &udev->rx;
931         if (udev->usb_state != PM_NORMAL) {
932                 pr_err("usb suspend - invalid state\n");
933                 return -1;
934         }
935 
936         udev->usb_state = PM_SUSPEND;
937 
938         spin_lock_irqsave(&rx->submit_lock, flags);
939         list_for_each_entry_safe(r, r_next, &rx->rx_submit_list, rx_submit_list)
940         {
941                 spin_unlock_irqrestore(&rx->submit_lock, flags);
942                 usb_kill_urb(r->urb);
943                 spin_lock_irqsave(&rx->submit_lock, flags);
944         }
945         spin_unlock_irqrestore(&rx->submit_lock, flags);
946 
947         return 0;
948 }
949 
950 static int gdm_usb_resume(struct usb_interface *intf)
951 {
952         struct phy_dev *phy_dev;
953         struct lte_udev *udev;
954         struct tx_cxt *tx;
955         struct rx_cxt *rx;
956         unsigned long flags;
957         int issue_count;
958         int i;
959 
960         phy_dev = usb_get_intfdata(intf);
961         udev = phy_dev->priv_dev;
962         rx = &udev->rx;
963 
964         if (udev->usb_state != PM_SUSPEND) {
965                 pr_err("usb resume - invalid state\n");
966                 return -1;
967         }
968         udev->usb_state = PM_NORMAL;
969 
970         spin_lock_irqsave(&rx->rx_lock, flags);
971         issue_count = rx->avail_count - MAX_RX_SUBMIT_COUNT;
972         spin_unlock_irqrestore(&rx->rx_lock, flags);
973 
974         if (issue_count >= 0) {
975                 for (i = 0; i < issue_count; i++)
976                         gdm_usb_recv(phy_dev->priv_dev,
977                                      udev->rx_cb,
978                                      phy_dev,
979                                      USB_COMPLETE);
980         }
981 
982         tx = &udev->tx;
983         spin_lock_irqsave(&tx->lock, flags);
984         queue_work(usb_tx_wq, &udev->work_tx.work);
985         spin_unlock_irqrestore(&tx->lock, flags);
986 
987         return 0;
988 }
989 
990 static struct usb_driver gdm_usb_lte_driver = {
991         .name = "gdm_lte",
992         .probe = gdm_usb_probe,
993         .disconnect = gdm_usb_disconnect,
994         .id_table = id_table,
995         .supports_autosuspend = 1,
996         .suspend = gdm_usb_suspend,
997         .resume = gdm_usb_resume,
998         .reset_resume = gdm_usb_resume,
999 };
1000 
1001 static int __init gdm_usb_lte_init(void)
1002 {
1003         if (gdm_lte_event_init() < 0) {
1004                 pr_err("error creating event\n");
1005                 return -1;
1006         }
1007 
1008         usb_tx_wq = create_workqueue("usb_tx_wq");
1009         if (usb_tx_wq == NULL)
1010                 return -1;
1011 
1012         usb_rx_wq = create_workqueue("usb_rx_wq");
1013         if (usb_rx_wq == NULL)
1014                 return -1;
1015 
1016         return usb_register(&gdm_usb_lte_driver);
1017 }
1018 
1019 static void __exit gdm_usb_lte_exit(void)
1020 {
1021         gdm_lte_event_exit();
1022 
1023         usb_deregister(&gdm_usb_lte_driver);
1024 
1025         if (usb_tx_wq) {
1026                 flush_workqueue(usb_tx_wq);
1027                 destroy_workqueue(usb_tx_wq);
1028         }
1029 
1030         if (usb_rx_wq) {
1031                 flush_workqueue(usb_rx_wq);
1032                 destroy_workqueue(usb_rx_wq);
1033         }
1034 }
1035 
1036 module_init(gdm_usb_lte_init);
1037 module_exit(gdm_usb_lte_exit);
1038 
1039 MODULE_VERSION(DRIVER_VERSION);
1040 MODULE_DESCRIPTION("GCT LTE USB Device Driver");
1041 MODULE_LICENSE("GPL");
1042 

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