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1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Espressif Systems Wireless LAN device driver
4  *
5  * SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD
6  *
7  */
8 #include "utils.h"
9 #include <linux/init.h>
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/gpio.h>
13 #include <linux/igmp.h>
14
15 #include "esp.h"
16 #include "esp_if.h"
17 #include "esp_bt_api.h"
18 #include "esp_api.h"
19 #include "esp_cmd.h"
20 #include "esp_kernel_port.h"
21
22 #include "esp_cfg80211.h"
23 #include "esp_stats.h"
24
25 #define HOST_GPIO_PIN_INVALID -1
26 static int resetpin = HOST_GPIO_PIN_INVALID;
27 extern u8 ap_bssid[MAC_ADDR_LEN];
28 extern volatile u8 host_sleep;
29
30 module_param(resetpin, int, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
31 MODULE_PARM_DESC(resetpin, "Host's GPIO pin number which is connected to ESP32's EN to reset ESP32 device");
32
33 static void deinit_adapter(void);
34
35
36 struct multicast_list mcast_list = {0};
37 struct esp_adapter adapter;
38 /*struct esp_device esp_dev;*/
39
40 struct esp_adapter *esp_get_adapter(void)
41 {
42         return &adapter;
43 }
44
45 void esp_process_new_packet_intr(struct esp_adapter *adapter)
46 {
47         if (adapter)
48                 queue_work(adapter->if_rx_workqueue, &adapter->if_rx_work);
49 }
50
51 static int process_tx_packet(struct sk_buff *skb)
52 {
53         struct esp_wifi_device *priv = NULL;
54         struct esp_skb_cb *cb = NULL;
55         struct esp_payload_header *payload_header = NULL;
56         struct sk_buff *new_skb = NULL;
57         int ret = 0;
58         u8 pad_len = 0, realloc_skb = 0;
59         u16 len = 0;
60         u16 total_len = 0;
61         static u8 c;
62         u8 *pos = NULL;
63
64         c++;
65         /* Get the priv */
66         cb = (struct esp_skb_cb *) skb->cb;
67         priv = cb->priv;
68
69         if (!priv) {
70                 dev_kfree_skb(skb);
71                 esp_info("No priv\n");
72                 return NETDEV_TX_OK;
73         }
74
75         if (netif_queue_stopped((const struct net_device *) priv->ndev)) {
76                 esp_info("Netif queue stopped\n");
77                 return NETDEV_TX_BUSY;
78         }
79
80         if (host_sleep) {
81                 return NETDEV_TX_BUSY;
82         }
83
84         len = skb->len;
85
86         /* Create space for payload header */
87         pad_len = sizeof(struct esp_payload_header);
88
89         total_len = len + pad_len;
90
91         /* Align buffer length */
92         pad_len += SKB_DATA_ADDR_ALIGNMENT - (total_len % SKB_DATA_ADDR_ALIGNMENT);
93
94         if (skb_headroom(skb) < pad_len) {
95                 /* Headroom is not sufficient */
96                 realloc_skb = 1;
97         }
98
99         if (realloc_skb || !IS_ALIGNED((unsigned long) skb->data, SKB_DATA_ADDR_ALIGNMENT)) {
100                 /* Realloc SKB */
101                 if (skb_linearize(skb)) {
102                         priv->stats.tx_errors++;
103                         dev_kfree_skb(skb);
104                         esp_err("Failed to linearize SKB");
105                         return NETDEV_TX_OK;
106                 }
107
108                 new_skb = esp_alloc_skb(skb->len + pad_len);
109
110                 if (!new_skb) {
111                         esp_err("Failed to allocate SKB");
112                         priv->stats.tx_errors++;
113                         dev_kfree_skb(skb);
114                         return NETDEV_TX_OK;
115                 }
116
117                 pos = new_skb->data;
118                 pos += pad_len;
119
120                 /* Populate new SKB */
121                 skb_copy_from_linear_data(skb, pos, skb->len);
122                 skb_put(new_skb, skb->len + pad_len);
123
124                 /* Replace old SKB */
125                 dev_kfree_skb_any(skb);
126                 skb = new_skb;
127         } else {
128                 /* Realloc is not needed, Make space for interface header */
129                 skb_push(skb, pad_len);
130         }
131
132         /* Set payload header */
133         payload_header = (struct esp_payload_header *) skb->data;
134         memset(payload_header, 0, pad_len);
135
136         payload_header->if_type = priv->if_type;
137         payload_header->if_num = priv->if_num;
138         payload_header->len = cpu_to_le16(len);
139         payload_header->offset = cpu_to_le16(pad_len);
140         payload_header->packet_type = PACKET_TYPE_DATA;
141
142         if (adapter.capabilities & ESP_CHECKSUM_ENABLED)
143                 payload_header->checksum = cpu_to_le16(compute_checksum(skb->data, (len + pad_len)));
144
145         if (!priv->stop_data) {
146                 ret = esp_send_packet(priv->adapter, skb);
147
148                 if (ret) {
149 /*                      esp_err("Failed to send SKB");*/
150                         priv->stats.tx_errors++;
151                 } else {
152                         priv->stats.tx_packets++;
153                         priv->stats.tx_bytes += skb->len;
154                 }
155         } else {
156                 dev_kfree_skb_any(skb);
157                 priv->stats.tx_dropped++;
158         }
159
160         return 0;
161 }
162
163 void esp_port_open(struct esp_wifi_device *priv)
164 {
165         priv->port_open = 1;
166         priv->stop_data = 0;
167 }
168
169 void esp_port_close(struct esp_wifi_device *priv)
170 {
171         if (!priv)
172                 return;
173
174         priv->port_open = 0;
175         priv->stop_data = 1;
176 }
177
178 void print_capabilities(u32 cap)
179 {
180         esp_info("Capabilities: 0x%x. Features supported are:\n", cap);
181         if (cap & ESP_WLAN_SDIO_SUPPORT)
182                 esp_info("\t * WLAN on SDIO\n");
183         else if (cap & ESP_WLAN_SPI_SUPPORT)
184                 esp_info("\t * WLAN on SPI\n");
185
186         if ((cap & ESP_BT_UART_SUPPORT) ||
187                     (cap & ESP_BT_SDIO_SUPPORT) ||
188                     (cap & ESP_BT_SPI_SUPPORT)) {
189                 esp_info("\t * BT/BLE\n");
190                 if (cap & ESP_BT_UART_SUPPORT)
191                         esp_info("\t   - HCI over UART\n");
192                 if (cap & ESP_BT_SDIO_SUPPORT)
193                         esp_info("\t   - HCI over SDIO\n");
194                 if (cap & ESP_BT_SPI_SUPPORT)
195                         esp_info("\t   - HCI over SPI\n");
196
197                 if ((cap & ESP_BLE_ONLY_SUPPORT) && (cap & ESP_BR_EDR_ONLY_SUPPORT))
198                         esp_info("\t   - BT/BLE dual mode\n");
199                 else if (cap & ESP_BLE_ONLY_SUPPORT)
200                         esp_info("\t   - BLE only\n");
201                 else if (cap & ESP_BR_EDR_ONLY_SUPPORT)
202                         esp_info("\t   - BR EDR only\n");
203         }
204 }
205
206 void process_capabilities(struct esp_adapter *adapter)
207 {
208         esp_info("ESP peripheral capabilities: 0x%x\n", adapter->capabilities);
209
210         /* Reset BT */
211         esp_deinit_bt(adapter);
212
213         if ((adapter->capabilities & ESP_BT_SPI_SUPPORT) ||
214                 (adapter->capabilities & ESP_BT_SDIO_SUPPORT)) {
215                 msleep(200);
216                 esp_info("ESP Bluetooth init\n");
217                 esp_init_bt(adapter);
218         }
219 }
220
221 static int check_esp_version(struct fw_version *ver)
222 {
223         esp_info("esp32: ESP Firmware version: %u.%u.%u\n",
224                         ver->major1, ver->major2, ver->minor);
225         if (!ver->major1) {
226                 esp_err("Incompatible ESP firmware release detected, Please use correct ESP-Hosted branch/compatible release\n");
227                 return -1;
228         }
229         return 0;
230 }
231
232 static void print_reset_reason(uint32_t reason)
233 {
234         switch (reason)
235         {
236                 case 1: esp_info("POWERON_RESET\n"); break;          /**<1, Vbat power on reset*/
237                 case 3: esp_info("SW_RESET\n"); break;               /**<3, Software reset digital core*/
238                 case 4: esp_info("OWDT_RESET\n"); break;             /**<4, Legacy watch dog reset digital core*/
239                 case 5: esp_info("DEEPSLEEP_RESET\n"); break;        /**<5, Deep Sleep reset digital core*/
240                 case 6: esp_info("SDIO_RESET\n"); break;             /**<6, Reset by SLC module, reset digital core*/
241                 case 7: esp_info("TG0WDT_SYS_RESET\n"); break;       /**<7, Timer Group0 Watch dog reset digital core*/
242                 case 8: esp_info("TG1WDT_SYS_RESET\n"); break;       /**<8, Timer Group1 Watch dog reset digital core*/
243                 case 9: esp_info("RTCWDT_SYS_RESET\n"); break;       /**<9, RTC Watch dog Reset digital core*/
244                 case 10: esp_info("INTRUSION_RESET\n"); break;       /**<10, Instrusion tested to reset CPU*/
245                 case 11: esp_info("TGWDT_CPU_RESET\n"); break;       /**<11, Time Group reset CPU*/
246                 case 12: esp_info("SW_CPU_RESET\n"); break;          /**<12, Software reset CPU*/
247                 case 13: esp_info("RTCWDT_CPU_RESET\n"); break;      /**<13, RTC Watch dog Reset CPU*/
248                 case 14: esp_info("EXT_CPU_RESET\n"); break;         /**<14, for APP CPU, reseted by PRO CPU*/
249                 case 15: esp_info("RTCWDT_BROWN_OUT_RESET\n"); break;/**<15, Reset when the vdd voltage is not stable*/
250                 case 16: esp_info("RTCWDT_RTC_RESET\n"); break;      /**<16, RTC Watch dog reset digital core and rtc module*/
251                 default: esp_info("Unknown[%u]\n", reason); break;
252         }
253 }
254
255 int process_fw_data(struct fw_data *fw_p)
256 {
257         if (!fw_p) {
258                 esp_err("Incomplete/incorrect bootup event received\n");
259                 return -1;
260         }
261
262         esp_info("ESP chipset's last reset cause:\n");
263         print_reset_reason(le32_to_cpu(fw_p->last_reset_reason));
264         return check_esp_version(&fw_p->version);
265 }
266
267 static int esp_open(struct net_device *ndev)
268 {
269         return 0;
270 }
271
272 static int esp_stop(struct net_device *ndev)
273 {
274         struct esp_wifi_device *priv = netdev_priv(ndev);
275
276         ESP_MARK_SCAN_DONE(priv, true);
277         return 0;
278 }
279
280 static struct net_device_stats *esp_get_stats(struct net_device *ndev)
281 {
282         struct esp_wifi_device *priv = netdev_priv(ndev);
283
284         if (!priv)
285                 return NULL;
286
287         return &priv->stats;
288 }
289
290 static int esp_set_mac_address(struct net_device *ndev, void *data)
291 {
292         struct esp_wifi_device *priv = netdev_priv(ndev);
293         struct sockaddr *sa = (struct sockaddr *)data;
294         int ret;
295
296         if (!priv || !priv->adapter)
297                 return -EINVAL;
298
299         esp_info("%u "MACSTR"\n", __LINE__, MAC2STR(sa->sa_data));
300
301         ret = cmd_set_mac(priv, sa->sa_data);
302
303         if (ret == 0)
304                 eth_hw_addr_set(ndev, priv->mac_address/*mac_addr->sa_data*/);
305
306         return ret;
307 }
308
309 static void esp_set_rx_mode(struct net_device *ndev)
310 {
311         struct esp_wifi_device *priv = netdev_priv(ndev);
312         struct netdev_hw_addr *mac_addr;
313         u32 count = 0;
314 #if 0
315         struct in_device *in_dev = in_dev_get(ndev);
316         struct ip_mc_list *ip_list = in_dev->mc_list;
317 #endif
318         netdev_for_each_mc_addr(mac_addr, ndev) {
319                 if (count < MAX_MULTICAST_ADDR_COUNT) {
320                         /*esp_info("%d: "MACSTR"\n", count+1, MAC2STR(mac_addr->addr));*/
321                         memcpy(&mcast_list.mcast_addr[count++], mac_addr->addr, ETH_ALEN);
322                 }
323         }
324
325         mcast_list.priv = priv;
326         mcast_list.addr_count = count;
327
328         if (priv->port_open) {
329                 /*esp_info("Set Multicast list\n");*/
330                 if (adapter.mac_filter_wq)
331                         queue_work(adapter.mac_filter_wq, &adapter.mac_flter_work);
332         }
333 #if 0
334         cmd_set_mcast_mac_list(priv, &mcast_list);
335         while (ip_list) {
336                 esp_dbg(" IP MC Address: 0x%x\n", ip_list->multiaddr);
337                 ip_list = ip_list->next;
338         }
339 #endif
340
341 }
342
343 static int esp_hard_start_xmit(struct sk_buff *skb, struct net_device *ndev)
344 {
345         struct esp_wifi_device *priv = NULL;
346         struct esp_skb_cb *cb = NULL;
347
348         if (!skb || !ndev)
349                 return NETDEV_TX_OK;
350
351         priv = netdev_priv(ndev);
352         if (!priv) {
353                 dev_kfree_skb(skb);
354                 return NETDEV_TX_OK;
355         }
356
357         if (!priv->port_open) {
358                 priv->stats.tx_dropped++;
359                 /*esp_err("Port not yet open\n");*/
360                 dev_kfree_skb(skb);
361                 return NETDEV_TX_OK;
362         }
363
364         if (!skb->len || (skb->len > ETH_FRAME_LEN)) {
365                 esp_err("Bad len %d\n", skb->len);
366                 priv->stats.tx_dropped++;
367                 dev_kfree_skb(skb);
368                 return NETDEV_TX_OK;
369         }
370
371         cb = (struct esp_skb_cb *) skb->cb;
372         cb->priv = priv;
373
374         return process_tx_packet(skb);
375 }
376
377 static const struct net_device_ops esp_netdev_ops = {
378         .ndo_open = esp_open,
379         .ndo_stop = esp_stop,
380         .ndo_start_xmit = esp_hard_start_xmit,
381         .ndo_set_mac_address = esp_set_mac_address,
382         .ndo_validate_addr = eth_validate_addr,
383         .ndo_get_stats = esp_get_stats,
384         .ndo_set_rx_mode = esp_set_rx_mode,
385 };
386
387
388 void esp_init_priv(struct net_device *ndev)
389 {
390         ndev->netdev_ops = &esp_netdev_ops;
391         ndev->needed_headroom = roundup(sizeof(struct esp_payload_header) +
392                         INTERFACE_HEADER_PADDING, 4);
393 }
394
395 static int add_network_iface(void)
396 {
397         int ret = 0;
398         struct esp_adapter *adapter = esp_get_adapter();
399         struct wireless_dev *wdev = NULL;
400
401         if (!adapter) {
402                 esp_info("adapter not yet init\n");
403                 return -EINVAL;
404         }
405
406         ret = esp_cfg80211_register(adapter);
407         if (ret) {
408                 esp_err("Failed to register with cfg80211 (err code 0x%x)\n", ret);
409                 return ret;
410         }
411
412         rtnl_lock();
413         wdev = esp_cfg80211_add_iface(adapter->wiphy, "espsta%d", 1, NL80211_IFTYPE_STATION, NULL);
414         rtnl_unlock();
415
416         /* Return success if network added successfully */
417         if (wdev)
418                 return 0;
419
420         return -1;
421 }
422
423 int esp_add_card(struct esp_adapter *adapter)
424 {
425         RET_ON_FAIL(esp_commands_setup(adapter));
426
427         RET_ON_FAIL(add_network_iface());
428
429         return 0;
430 }
431
432 void esp_remove_network_interfaces(struct esp_adapter *adapter)
433 {
434         uint8_t iface_idx = 0;
435         struct net_device *ndev = NULL;
436         struct esp_wifi_device *priv = NULL;
437
438         for (iface_idx = 0; iface_idx < ESP_MAX_INTERFACE; iface_idx++) {
439
440                 priv = adapter->priv[iface_idx];
441
442                 if (!priv)
443                         continue;
444
445                 if (!test_bit(ESP_NETWORK_UP, &priv->priv_flags))
446                         continue;
447
448                 /* stop and unregister network */
449                 ndev = priv->ndev;
450
451                 if (ndev) {
452
453                         if (netif_carrier_ok(ndev))
454                                 netif_carrier_off(ndev);
455
456                         netif_device_detach(ndev);
457
458                         if (ndev->reg_state == NETREG_REGISTERED) {
459                                 unregister_inetaddr_notifier(&(adapter->priv[0]->nb));
460                                 unregister_netdev(ndev);
461                                 free_netdev(ndev);
462                                 ndev = NULL;
463                         }
464                 }
465                 clear_bit(ESP_NETWORK_UP, &priv->priv_flags);
466         }
467
468         if (adapter->wiphy) {
469
470                 wiphy_unregister(adapter->wiphy);
471                 wiphy_free(adapter->wiphy);
472                 adapter->wiphy = NULL;
473         }
474 }
475
476 int esp_remove_card(struct esp_adapter *adapter)
477 {
478         uint8_t iface_idx = 0;
479
480         if (!adapter) {
481                 return 0;
482         }
483
484         esp_deinit_bt(adapter);
485
486         esp_commands_teardown(adapter);
487
488         esp_remove_network_interfaces(adapter);
489
490         for (iface_idx = 0; iface_idx < ESP_MAX_INTERFACE; iface_idx++) {
491                 esp_port_close(adapter->priv[iface_idx]);
492                 adapter->priv[iface_idx] = NULL;
493         }
494
495         return 0;
496 }
497
498 struct esp_wifi_device *get_priv_from_payload_header(
499                 struct esp_payload_header *header)
500 {
501         struct esp_wifi_device *priv = NULL;
502         u8 i = 0;
503
504         if (!header)
505                 return NULL;
506
507         for (i = 0; i < ESP_MAX_INTERFACE; i++) {
508                 priv = adapter.priv[i];
509
510                 if (!priv)
511                         continue;
512
513                 if (priv->if_type == header->if_type &&
514                                 priv->if_num == header->if_num) {
515                         return priv;
516                 }
517         }
518         return NULL;
519 }
520
521 static void process_esp_bootup_event(struct esp_adapter *adapter,
522                 struct esp_internal_bootup_event *evt)
523 {
524         if (!adapter || !evt) {
525                 esp_err("Invalid arguments\n");
526                 return;
527         }
528
529         if (evt->header.status) {
530                 esp_err("Incorrect ESP bootup event\n");
531                 return;
532         }
533
534         esp_info("\nReceived ESP bootup event\n");
535         process_event_esp_bootup(adapter, evt->data, evt->len);
536 }
537
538 static int process_internal_event(struct esp_adapter *adapter,
539                 struct sk_buff *skb)
540 {
541         struct event_header *header = NULL;
542
543         if (!skb || !adapter) {
544                 esp_err("esp32: Incorrect event data!\n");
545                 return -1;
546         }
547
548         header = (struct event_header *) (skb->data);
549
550         switch (header->event_code) {
551
552         case ESP_INTERNAL_BOOTUP_EVENT:
553                 process_esp_bootup_event(adapter,
554                         (struct esp_internal_bootup_event *)(skb->data));
555                 break;
556
557         default:
558                 esp_info("%u unhandled internal event[%u]\n",
559                                 __LINE__, header->event_code);
560                 break;
561         }
562
563         return 0;
564 }
565
566 static void process_rx_packet(struct esp_adapter *adapter, struct sk_buff *skb)
567 {
568         struct esp_wifi_device *priv = NULL;
569         struct esp_payload_header *payload_header = NULL;
570         u16 len = 0, offset = 0;
571         u16 rx_checksum = 0, checksum = 0;
572         struct hci_dev *hdev = adapter->hcidev;
573         u8 *type = NULL;
574         struct sk_buff *eap_skb = NULL;
575         struct ethhdr *eth = NULL;
576
577         if (!skb)
578                 return;
579
580         /* get the paload header */
581         payload_header = (struct esp_payload_header *) skb->data;
582
583         len = le16_to_cpu(payload_header->len);
584         offset = le16_to_cpu(payload_header->offset);
585
586         if (payload_header->reserved2 == 0xFF) {
587                 print_hex_dump(KERN_INFO, "Wake up packet: ", DUMP_PREFIX_ADDRESS, 16, 1, skb->data, len+offset, 1);
588         }
589
590         if (adapter->capabilities & ESP_CHECKSUM_ENABLED) {
591                 rx_checksum = le16_to_cpu(payload_header->checksum);
592                 payload_header->checksum = 0;
593
594                 checksum = compute_checksum(skb->data, (len + offset));
595
596                 if (checksum != rx_checksum) {
597                         dev_kfree_skb_any(skb);
598                         return;
599                 }
600         }
601
602         /* chop off the header from skb */
603         skb_pull(skb, offset);
604
605         if (payload_header->if_type == ESP_STA_IF || payload_header->if_type == ESP_AP_IF) {
606
607                 /* retrieve priv based on payload header contents */
608                 priv = get_priv_from_payload_header(payload_header);
609
610                 if (!priv) {
611                         esp_err("Empty priv\n");
612                         dev_kfree_skb_any(skb);
613                         return;
614                 }
615
616                 if (payload_header->packet_type == PACKET_TYPE_EAPOL) {
617                         esp_info("Rx PACKET_TYPE_EAPOL!!!!\n");
618                         esp_port_open(priv);
619
620                         eap_skb = alloc_skb(skb->len + ETH_HLEN, GFP_KERNEL);
621                         if (!eap_skb) {
622                                 esp_info("%u memory alloc failed\n", __LINE__);
623                                 return;
624                         }
625                         eap_skb->dev = priv->ndev;
626
627                         if (!IS_ALIGNED((unsigned long) eap_skb->data, SKB_DATA_ADDR_ALIGNMENT)) {
628                                 esp_info("%u eap skb unaligned\n", __LINE__);
629                         }
630
631                         eth = (struct ethhdr *) skb_put(eap_skb, ETH_HLEN);
632                         ether_addr_copy(eth->h_dest, /*skb->data*/priv->ndev->dev_addr);
633                         ether_addr_copy(eth->h_source, /*skb->data+6*/ ap_bssid);
634                         eth->h_proto = cpu_to_be16(ETH_P_PAE);
635
636                         skb_put_data(eap_skb, skb->data, skb->len);
637                         eap_skb->protocol = eth_type_trans(eap_skb, eap_skb->dev);
638
639                         netif_rx(eap_skb);
640
641                 } else if (payload_header->packet_type == PACKET_TYPE_DATA) {
642
643                         skb->dev = priv->ndev;
644                         skb->protocol = eth_type_trans(skb, priv->ndev);
645                         skb->ip_summed = CHECKSUM_NONE;
646
647                         priv->stats.rx_bytes += skb->len;
648                         /* Forward skb to kernel */
649                         NETIF_RX_NI(skb);
650                         priv->stats.rx_packets++;
651                 } else if (payload_header->packet_type == PACKET_TYPE_COMMAND_RESPONSE) {
652                         process_cmd_resp(priv->adapter, skb);
653                 } else if (payload_header->packet_type == PACKET_TYPE_EVENT) {
654                         process_cmd_event(priv, skb);
655                         dev_kfree_skb_any(skb);
656                 }
657
658         } else if (payload_header->if_type == ESP_HCI_IF) {
659                 if (hdev) {
660
661                         type = skb->data;
662                         hci_skb_pkt_type(skb) = *type;
663                         skb_pull(skb, 1);
664
665 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 13, 0))
666                         if (hci_recv_frame(hdev, skb)) {
667 #else
668                         if (hci_recv_frame(skb)) {
669 #endif
670                                 hdev->stat.err_rx++;
671                         } else {
672                                 esp_hci_update_rx_counter(hdev, *type, skb->len);
673                         }
674                 }
675         } else if (payload_header->if_type == ESP_INTERNAL_IF) {
676
677                 /* Queue event skb for processing in events workqueue */
678                 skb_queue_tail(&adapter->events_skb_q, skb);
679
680                 if (adapter->events_wq)
681                         queue_work(adapter->events_wq, &adapter->events_work);
682                 else
683                         dev_kfree_skb_any(skb);
684
685         } else if (payload_header->if_type == ESP_TEST_IF) {
686                 #if TEST_RAW_TP
687                         update_test_raw_tp_rx_stats(len);
688                 #endif
689                 dev_kfree_skb_any(skb);
690         } else {
691                 dev_kfree_skb_any(skb);
692         }
693 }
694
695 int esp_is_tx_queue_paused(struct esp_wifi_device *priv)
696 {
697         if (!priv || !priv->ndev)
698                 return 0;
699
700         if ((priv->ndev &&
701                     !netif_queue_stopped((const struct net_device *)priv->ndev)))
702                 return 1;
703     return 0;
704 }
705
706 void esp_tx_pause(struct esp_wifi_device *priv)
707 {
708         if (!priv || !priv->ndev)
709                 return;
710
711         if (!netif_queue_stopped((const struct net_device *)priv->ndev)) {
712                 netif_stop_queue(priv->ndev);
713         }
714 }
715
716 void esp_tx_resume(struct esp_wifi_device *priv)
717 {
718         if (!priv || !priv->ndev)
719                 return;
720
721         if (netif_queue_stopped((const struct net_device *)priv->ndev)) {
722                 netif_wake_queue(priv->ndev);
723         }
724 }
725
726 struct sk_buff *esp_alloc_skb(u32 len)
727 {
728         struct sk_buff *skb = NULL;
729
730         u8 offset;
731
732         skb = netdev_alloc_skb(NULL, len + INTERFACE_HEADER_PADDING);
733
734         if (skb) {
735                 /* Align SKB data pointer */
736                 offset = ((unsigned long)skb->data) & (SKB_DATA_ADDR_ALIGNMENT - 1);
737
738                 if (offset)
739                         skb_reserve(skb, INTERFACE_HEADER_PADDING - offset);
740         }
741
742         return skb;
743 }
744
745
746 static int esp_get_packets(struct esp_adapter *adapter)
747 {
748         struct sk_buff *skb = NULL;
749
750         if (!adapter || !adapter->if_ops || !adapter->if_ops->read)
751                 return -EINVAL;
752
753         skb = adapter->if_ops->read(adapter);
754
755         if (!skb)
756                 return -EFAULT;
757
758         process_rx_packet(adapter, skb);
759
760         return 0;
761 }
762
763 int esp_send_packet(struct esp_adapter *adapter, struct sk_buff *skb)
764 {
765         if (!adapter || !adapter->if_ops || !adapter->if_ops->write) {
766                 esp_err("%u adapter: %p\n", __LINE__, adapter);
767                 return -EINVAL;
768         }
769
770         return adapter->if_ops->write(adapter, skb);
771 }
772
773 static void esp_if_rx_work(struct work_struct *work)
774 {
775         /* read inbound packet and forward it to network/serial interface */
776         esp_get_packets(&adapter);
777 }
778
779 static void update_mac_filter(struct work_struct *work)
780 {
781         cmd_set_mcast_mac_list(mcast_list.priv, &mcast_list);
782 }
783
784 static void esp_events_work(struct work_struct *work)
785 {
786         struct sk_buff *skb = NULL;
787
788         skb = skb_dequeue(&adapter.events_skb_q);
789         if (!skb)
790                 return;
791
792         process_internal_event(&adapter, skb);
793         dev_kfree_skb_any(skb);
794 }
795
796 static struct esp_adapter *init_adapter(void)
797 {
798         memset(&adapter, 0, sizeof(adapter));
799
800         /* Prepare interface RX work */
801         adapter.if_rx_workqueue = alloc_workqueue("ESP_IF_RX_WORK_QUEUE", 0, 0);
802
803         if (!adapter.if_rx_workqueue) {
804                 deinit_adapter();
805                 return NULL;
806         }
807
808         INIT_WORK(&adapter.if_rx_work, esp_if_rx_work);
809
810         skb_queue_head_init(&adapter.events_skb_q);
811
812         adapter.events_wq = alloc_workqueue("ESP_EVENTS_WORKQUEUE", WQ_HIGHPRI, 0);
813
814         if (!adapter.events_wq) {
815                 deinit_adapter();
816                 return NULL;
817         }
818
819         INIT_WORK(&adapter.events_work, esp_events_work);
820
821         adapter.mac_filter_wq = alloc_workqueue("MAC_FILTER", 0, 0);
822         if (!adapter.mac_filter_wq) {
823                 deinit_adapter();
824                 return NULL;
825         }
826
827         INIT_WORK(&adapter.mac_flter_work, update_mac_filter);
828
829         return &adapter;
830 }
831
832 static void deinit_adapter(void)
833 {
834         skb_queue_purge(&adapter.events_skb_q);
835
836         if (adapter.events_wq)
837                 destroy_workqueue(adapter.events_wq);
838
839         if (adapter.if_rx_workqueue)
840                 destroy_workqueue(adapter.if_rx_workqueue);
841
842         if (adapter.mac_filter_wq)
843                 destroy_workqueue(adapter.mac_filter_wq);
844 }
845
846 static void esp_reset(void)
847 {
848         if (resetpin != HOST_GPIO_PIN_INVALID) {
849                 /* Check valid GPIO or not */
850                 if (!gpio_is_valid(resetpin)) {
851                         esp_warn("host resetpin (%d) configured is invalid GPIO\n", resetpin);
852                         resetpin = HOST_GPIO_PIN_INVALID;
853                 } else {
854                         gpio_request(resetpin, "sysfs");
855
856                         /* HOST's resetpin set to OUTPUT, HIGH */
857                         gpio_direction_output(resetpin, true);
858
859                         /* HOST's resetpin set to LOW */
860                         gpio_set_value(resetpin, 0);
861                         udelay(200);
862
863                         /* HOST's resetpin set to INPUT */
864                         gpio_direction_input(resetpin);
865
866                         esp_dbg("Triggering ESP reset.\n");
867                 }
868         }
869 }
870
871
872 static int __init esp_init(void)
873 {
874         int ret = 0;
875         struct esp_adapter *adapter = NULL;
876
877         /* Reset ESP, Clean start ESP */
878         esp_reset();
879         msleep(200);
880
881         adapter = init_adapter();
882
883         if (!adapter)
884                 return -EFAULT;
885
886         /* Init transport layer */
887         ret = esp_init_interface_layer(adapter);
888
889         if (ret != 0) {
890                 deinit_adapter();
891         }
892
893         return ret;
894 }
895
896 static void __exit esp_exit(void)
897 {
898         uint8_t iface_idx = 0;
899 #if TEST_RAW_TP
900         test_raw_tp_cleanup();
901 #endif
902         for (iface_idx = 0; iface_idx < ESP_MAX_INTERFACE; iface_idx++) {
903                 cmd_deinit_interface(adapter.priv[iface_idx]);
904         }
905         clear_bit(ESP_DRIVER_ACTIVE, &adapter.state_flags);
906
907         esp_deinit_interface_layer();
908         deinit_adapter();
909
910         if (resetpin != HOST_GPIO_PIN_INVALID) {
911                 gpio_free(resetpin);
912         }
913 }
914 MODULE_LICENSE("GPL");
915 MODULE_AUTHOR("Amey Inamdar <[email protected]>");
916 MODULE_AUTHOR("Mangesh Malusare <[email protected]>");
917 MODULE_AUTHOR("Yogesh Mantri <[email protected]>");
918 MODULE_DESCRIPTION("Wifi driver for ESP-Hosted solution");
919 MODULE_VERSION("0.1");
920 module_init(esp_init);
921 module_exit(esp_exit);
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