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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Handling of the chip-to-host events (aka indications) of the hardware API.
0004  *
0005  * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
0006  * Copyright (c) 2010, ST-Ericsson
0007  */
0008 #include <linux/skbuff.h>
0009 #include <linux/etherdevice.h>
0010 
0011 #include "hif_rx.h"
0012 #include "wfx.h"
0013 #include "scan.h"
0014 #include "bh.h"
0015 #include "sta.h"
0016 #include "data_rx.h"
0017 #include "hif_api_cmd.h"
0018 
0019 static int wfx_hif_generic_confirm(struct wfx_dev *wdev,
0020                    const struct wfx_hif_msg *hif, const void *buf)
0021 {
0022     /* All confirm messages start with status */
0023     int status = le32_to_cpup((__le32 *)buf);
0024     int cmd = hif->id;
0025     int len = le16_to_cpu(hif->len) - 4; /* drop header */
0026 
0027     WARN(!mutex_is_locked(&wdev->hif_cmd.lock), "data locking error");
0028 
0029     if (!wdev->hif_cmd.buf_send) {
0030         dev_warn(wdev->dev, "unexpected confirmation: 0x%.2x\n", cmd);
0031         return -EINVAL;
0032     }
0033 
0034     if (cmd != wdev->hif_cmd.buf_send->id) {
0035         dev_warn(wdev->dev, "chip response mismatch request: 0x%.2x vs 0x%.2x\n",
0036              cmd, wdev->hif_cmd.buf_send->id);
0037         return -EINVAL;
0038     }
0039 
0040     if (wdev->hif_cmd.buf_recv) {
0041         if (wdev->hif_cmd.len_recv >= len && len > 0)
0042             memcpy(wdev->hif_cmd.buf_recv, buf, len);
0043         else
0044             status = -EIO;
0045     }
0046     wdev->hif_cmd.ret = status;
0047 
0048     complete(&wdev->hif_cmd.done);
0049     return status;
0050 }
0051 
0052 static int wfx_hif_tx_confirm(struct wfx_dev *wdev,
0053                   const struct wfx_hif_msg *hif, const void *buf)
0054 {
0055     const struct wfx_hif_cnf_tx *body = buf;
0056 
0057     wfx_tx_confirm_cb(wdev, body);
0058     return 0;
0059 }
0060 
0061 static int wfx_hif_multi_tx_confirm(struct wfx_dev *wdev,
0062                     const struct wfx_hif_msg *hif, const void *buf)
0063 {
0064     const struct wfx_hif_cnf_multi_transmit *body = buf;
0065     int i;
0066 
0067     WARN(body->num_tx_confs <= 0, "corrupted message");
0068     for (i = 0; i < body->num_tx_confs; i++)
0069         wfx_tx_confirm_cb(wdev, &body->tx_conf_payload[i]);
0070     return 0;
0071 }
0072 
0073 static int wfx_hif_startup_indication(struct wfx_dev *wdev,
0074                       const struct wfx_hif_msg *hif, const void *buf)
0075 {
0076     const struct wfx_hif_ind_startup *body = buf;
0077 
0078     if (body->status || body->firmware_type > 4) {
0079         dev_err(wdev->dev, "received invalid startup indication");
0080         return -EINVAL;
0081     }
0082     memcpy(&wdev->hw_caps, body, sizeof(struct wfx_hif_ind_startup));
0083     complete(&wdev->firmware_ready);
0084     return 0;
0085 }
0086 
0087 static int wfx_hif_wakeup_indication(struct wfx_dev *wdev,
0088                      const struct wfx_hif_msg *hif, const void *buf)
0089 {
0090     if (!wdev->pdata.gpio_wakeup || gpiod_get_value(wdev->pdata.gpio_wakeup) == 0) {
0091         dev_warn(wdev->dev, "unexpected wake-up indication\n");
0092         return -EIO;
0093     }
0094     return 0;
0095 }
0096 
0097 static int wfx_hif_receive_indication(struct wfx_dev *wdev, const struct wfx_hif_msg *hif,
0098                       const void *buf, struct sk_buff *skb)
0099 {
0100     struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
0101     const struct wfx_hif_ind_rx *body = buf;
0102 
0103     if (!wvif) {
0104         dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
0105         return -EIO;
0106     }
0107     skb_pull(skb, sizeof(struct wfx_hif_msg) + sizeof(struct wfx_hif_ind_rx));
0108     wfx_rx_cb(wvif, body, skb);
0109 
0110     return 0;
0111 }
0112 
0113 static int wfx_hif_event_indication(struct wfx_dev *wdev,
0114                     const struct wfx_hif_msg *hif, const void *buf)
0115 {
0116     struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
0117     const struct wfx_hif_ind_event *body = buf;
0118     int type = le32_to_cpu(body->event_id);
0119 
0120     if (!wvif) {
0121         dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
0122         return -EIO;
0123     }
0124 
0125     switch (type) {
0126     case HIF_EVENT_IND_RCPI_RSSI:
0127         wfx_event_report_rssi(wvif, body->event_data.rcpi_rssi);
0128         break;
0129     case HIF_EVENT_IND_BSSLOST:
0130         schedule_delayed_work(&wvif->beacon_loss_work, 0);
0131         break;
0132     case HIF_EVENT_IND_BSSREGAINED:
0133         cancel_delayed_work(&wvif->beacon_loss_work);
0134         dev_dbg(wdev->dev, "ignore BSSREGAINED indication\n");
0135         break;
0136     case HIF_EVENT_IND_PS_MODE_ERROR:
0137         dev_warn(wdev->dev, "error while processing power save request: %d\n",
0138              le32_to_cpu(body->event_data.ps_mode_error));
0139         break;
0140     default:
0141         dev_warn(wdev->dev, "unhandled event indication: %.2x\n", type);
0142         break;
0143     }
0144     return 0;
0145 }
0146 
0147 static int wfx_hif_pm_mode_complete_indication(struct wfx_dev *wdev,
0148                            const struct wfx_hif_msg *hif, const void *buf)
0149 {
0150     struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
0151 
0152     if (!wvif) {
0153         dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
0154         return -EIO;
0155     }
0156     complete(&wvif->set_pm_mode_complete);
0157 
0158     return 0;
0159 }
0160 
0161 static int wfx_hif_scan_complete_indication(struct wfx_dev *wdev,
0162                         const struct wfx_hif_msg *hif, const void *buf)
0163 {
0164     struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
0165     const struct wfx_hif_ind_scan_cmpl *body = buf;
0166 
0167     if (!wvif) {
0168         dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
0169         return -EIO;
0170     }
0171 
0172     wfx_scan_complete(wvif, body->num_channels_completed);
0173 
0174     return 0;
0175 }
0176 
0177 static int wfx_hif_join_complete_indication(struct wfx_dev *wdev,
0178                         const struct wfx_hif_msg *hif, const void *buf)
0179 {
0180     struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
0181 
0182     if (!wvif) {
0183         dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
0184         return -EIO;
0185     }
0186     dev_warn(wdev->dev, "unattended JoinCompleteInd\n");
0187 
0188     return 0;
0189 }
0190 
0191 static int wfx_hif_suspend_resume_indication(struct wfx_dev *wdev,
0192                          const struct wfx_hif_msg *hif, const void *buf)
0193 {
0194     const struct wfx_hif_ind_suspend_resume_tx *body = buf;
0195     struct wfx_vif *wvif;
0196 
0197     if (body->bc_mc_only) {
0198         wvif = wdev_to_wvif(wdev, hif->interface);
0199         if (!wvif) {
0200             dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
0201             return -EIO;
0202         }
0203         if (body->resume)
0204             wfx_suspend_resume_mc(wvif, STA_NOTIFY_AWAKE);
0205         else
0206             wfx_suspend_resume_mc(wvif, STA_NOTIFY_SLEEP);
0207     } else {
0208         WARN(body->peer_sta_set, "misunderstood indication");
0209         WARN(hif->interface != 2, "misunderstood indication");
0210         if (body->resume)
0211             wfx_suspend_hot_dev(wdev, STA_NOTIFY_AWAKE);
0212         else
0213             wfx_suspend_hot_dev(wdev, STA_NOTIFY_SLEEP);
0214     }
0215 
0216     return 0;
0217 }
0218 
0219 static int wfx_hif_generic_indication(struct wfx_dev *wdev,
0220                       const struct wfx_hif_msg *hif, const void *buf)
0221 {
0222     const struct wfx_hif_ind_generic *body = buf;
0223     int type = le32_to_cpu(body->type);
0224 
0225     switch (type) {
0226     case HIF_GENERIC_INDICATION_TYPE_RAW:
0227         return 0;
0228     case HIF_GENERIC_INDICATION_TYPE_STRING:
0229         dev_info(wdev->dev, "firmware says: %s\n", (char *)&body->data);
0230         return 0;
0231     case HIF_GENERIC_INDICATION_TYPE_RX_STATS:
0232         mutex_lock(&wdev->rx_stats_lock);
0233         /* Older firmware send a generic indication beside RxStats */
0234         if (!wfx_api_older_than(wdev, 1, 4))
0235             dev_info(wdev->dev, "Rx test ongoing. Temperature: %d degrees C\n",
0236                  body->data.rx_stats.current_temp);
0237         memcpy(&wdev->rx_stats, &body->data.rx_stats, sizeof(wdev->rx_stats));
0238         mutex_unlock(&wdev->rx_stats_lock);
0239         return 0;
0240     case HIF_GENERIC_INDICATION_TYPE_TX_POWER_LOOP_INFO:
0241         mutex_lock(&wdev->tx_power_loop_info_lock);
0242         memcpy(&wdev->tx_power_loop_info, &body->data.tx_power_loop_info,
0243                sizeof(wdev->tx_power_loop_info));
0244         mutex_unlock(&wdev->tx_power_loop_info_lock);
0245         return 0;
0246     default:
0247         dev_err(wdev->dev, "generic_indication: unknown indication type: %#.8x\n", type);
0248         return -EIO;
0249     }
0250 }
0251 
0252 static const struct {
0253     int val;
0254     const char *str;
0255     bool has_param;
0256 } hif_errors[] = {
0257     { HIF_ERROR_FIRMWARE_ROLLBACK,
0258         "rollback status" },
0259     { HIF_ERROR_FIRMWARE_DEBUG_ENABLED,
0260         "debug feature enabled" },
0261     { HIF_ERROR_PDS_PAYLOAD,
0262         "PDS version is not supported" },
0263     { HIF_ERROR_PDS_TESTFEATURE,
0264         "PDS ask for an unknown test mode" },
0265     { HIF_ERROR_OOR_VOLTAGE,
0266         "out-of-range power supply voltage", true },
0267     { HIF_ERROR_OOR_TEMPERATURE,
0268         "out-of-range temperature", true },
0269     { HIF_ERROR_SLK_REQ_DURING_KEY_EXCHANGE,
0270         "secure link does not expect request during key exchange" },
0271     { HIF_ERROR_SLK_SESSION_KEY,
0272         "secure link session key is invalid" },
0273     { HIF_ERROR_SLK_OVERFLOW,
0274         "secure link overflow" },
0275     { HIF_ERROR_SLK_WRONG_ENCRYPTION_STATE,
0276         "secure link messages list does not match message encryption" },
0277     { HIF_ERROR_SLK_UNCONFIGURED,
0278         "secure link not yet configured" },
0279     { HIF_ERROR_HIF_BUS_FREQUENCY_TOO_LOW,
0280         "bus clock is too slow (<1kHz)" },
0281     { HIF_ERROR_HIF_RX_DATA_TOO_LARGE,
0282         "HIF message too large" },
0283     /* Following errors only exists in old firmware versions: */
0284     { HIF_ERROR_HIF_TX_QUEUE_FULL,
0285         "HIF messages queue is full" },
0286     { HIF_ERROR_HIF_BUS,
0287         "HIF bus" },
0288     { HIF_ERROR_SLK_MULTI_TX_UNSUPPORTED,
0289         "secure link does not support multi-tx confirmations" },
0290     { HIF_ERROR_SLK_OUTDATED_SESSION_KEY,
0291         "secure link session key is outdated" },
0292     { HIF_ERROR_SLK_DECRYPTION,
0293         "secure link params (nonce or tag) mismatch" },
0294 };
0295 
0296 static int wfx_hif_error_indication(struct wfx_dev *wdev,
0297                     const struct wfx_hif_msg *hif, const void *buf)
0298 {
0299     const struct wfx_hif_ind_error *body = buf;
0300     int type = le32_to_cpu(body->type);
0301     int param = (s8)body->data[0];
0302     int i;
0303 
0304     for (i = 0; i < ARRAY_SIZE(hif_errors); i++)
0305         if (type == hif_errors[i].val)
0306             break;
0307     if (i < ARRAY_SIZE(hif_errors))
0308         if (hif_errors[i].has_param)
0309             dev_err(wdev->dev, "asynchronous error: %s: %d\n",
0310                 hif_errors[i].str, param);
0311         else
0312             dev_err(wdev->dev, "asynchronous error: %s\n", hif_errors[i].str);
0313     else
0314         dev_err(wdev->dev, "asynchronous error: unknown: %08x\n", type);
0315     print_hex_dump(KERN_INFO, "hif: ", DUMP_PREFIX_OFFSET,
0316                16, 1, hif, le16_to_cpu(hif->len), false);
0317     wdev->chip_frozen = true;
0318 
0319     return 0;
0320 };
0321 
0322 static int wfx_hif_exception_indication(struct wfx_dev *wdev,
0323                     const struct wfx_hif_msg *hif, const void *buf)
0324 {
0325     const struct wfx_hif_ind_exception *body = buf;
0326     int type = le32_to_cpu(body->type);
0327 
0328     if (type == 4)
0329         dev_err(wdev->dev, "firmware assert %d\n", le32_to_cpup((__le32 *)body->data));
0330     else
0331         dev_err(wdev->dev, "firmware exception\n");
0332     print_hex_dump(KERN_INFO, "hif: ", DUMP_PREFIX_OFFSET,
0333                16, 1, hif, le16_to_cpu(hif->len), false);
0334     wdev->chip_frozen = true;
0335 
0336     return -1;
0337 }
0338 
0339 static const struct {
0340     int msg_id;
0341     int (*handler)(struct wfx_dev *wdev, const struct wfx_hif_msg *hif, const void *buf);
0342 } hif_handlers[] = {
0343     /* Confirmations */
0344     { HIF_CNF_ID_TX,                wfx_hif_tx_confirm },
0345     { HIF_CNF_ID_MULTI_TRANSMIT,    wfx_hif_multi_tx_confirm },
0346     /* Indications */
0347     { HIF_IND_ID_STARTUP,           wfx_hif_startup_indication },
0348     { HIF_IND_ID_WAKEUP,            wfx_hif_wakeup_indication },
0349     { HIF_IND_ID_JOIN_COMPLETE,     wfx_hif_join_complete_indication },
0350     { HIF_IND_ID_SET_PM_MODE_CMPL,  wfx_hif_pm_mode_complete_indication },
0351     { HIF_IND_ID_SCAN_CMPL,         wfx_hif_scan_complete_indication },
0352     { HIF_IND_ID_SUSPEND_RESUME_TX, wfx_hif_suspend_resume_indication },
0353     { HIF_IND_ID_EVENT,             wfx_hif_event_indication },
0354     { HIF_IND_ID_GENERIC,           wfx_hif_generic_indication },
0355     { HIF_IND_ID_ERROR,             wfx_hif_error_indication },
0356     { HIF_IND_ID_EXCEPTION,         wfx_hif_exception_indication },
0357     /* FIXME: allocate skb_p from wfx_hif_receive_indication and make it generic */
0358     //{ HIF_IND_ID_RX,              wfx_hif_receive_indication },
0359 };
0360 
0361 void wfx_handle_rx(struct wfx_dev *wdev, struct sk_buff *skb)
0362 {
0363     int i;
0364     const struct wfx_hif_msg *hif = (const struct wfx_hif_msg *)skb->data;
0365     int hif_id = hif->id;
0366 
0367     if (hif_id == HIF_IND_ID_RX) {
0368         /* wfx_hif_receive_indication take care of skb lifetime */
0369         wfx_hif_receive_indication(wdev, hif, hif->body, skb);
0370         return;
0371     }
0372     /* Note: mutex_is_lock cause an implicit memory barrier that protect buf_send */
0373     if (mutex_is_locked(&wdev->hif_cmd.lock) &&
0374         wdev->hif_cmd.buf_send && wdev->hif_cmd.buf_send->id == hif_id) {
0375         wfx_hif_generic_confirm(wdev, hif, hif->body);
0376         goto free;
0377     }
0378     for (i = 0; i < ARRAY_SIZE(hif_handlers); i++) {
0379         if (hif_handlers[i].msg_id == hif_id) {
0380             if (hif_handlers[i].handler)
0381                 hif_handlers[i].handler(wdev, hif, hif->body);
0382             goto free;
0383         }
0384     }
0385     if (hif_id & HIF_ID_IS_INDICATION)
0386         dev_err(wdev->dev, "unsupported HIF indication: ID %02x\n", hif_id);
0387     else
0388         dev_err(wdev->dev, "unexpected HIF confirmation: ID %02x\n", hif_id);
0389 free:
0390     dev_kfree_skb(skb);
0391 }
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