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// SPDX-License-Identifier: GPL-2.0-only
/*
* Handling of the chip-to-host events (aka indications) of the hardware API.
*
* Copyright (c) 2017-2020, Silicon Laboratories, Inc.
* Copyright (c) 2010, ST-Ericsson
*/
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include "hif_rx.h"
#include "wfx.h"
#include "scan.h"
#include "bh.h"
#include "sta.h"
#include "data_rx.h"
#include "hif_api_cmd.h"
static int hif_generic_confirm(struct wfx_dev *wdev,
const struct hif_msg *hif, const void *buf)
{
// All confirm messages start with status
int status = le32_to_cpup((__le32 *)buf);
int cmd = hif->id;
int len = le16_to_cpu(hif->len) - 4; // drop header
WARN(!mutex_is_locked(&wdev->hif_cmd.lock), "data locking error");
if (!wdev->hif_cmd.buf_send) {
dev_warn(wdev->dev, "unexpected confirmation: 0x%.2x\n", cmd);
return -EINVAL;
}
if (cmd != wdev->hif_cmd.buf_send->id) {
dev_warn(wdev->dev,
"chip response mismatch request: 0x%.2x vs 0x%.2x\n",
cmd, wdev->hif_cmd.buf_send->id);
return -EINVAL;
}
if (wdev->hif_cmd.buf_recv) {
if (wdev->hif_cmd.len_recv >= len && len > 0)
memcpy(wdev->hif_cmd.buf_recv, buf, len);
else
status = -EIO;
}
wdev->hif_cmd.ret = status;
complete(&wdev->hif_cmd.done);
return status;
}
static int hif_tx_confirm(struct wfx_dev *wdev,
const struct hif_msg *hif, const void *buf)
{
const struct hif_cnf_tx *body = buf;
wfx_tx_confirm_cb(wdev, body);
return 0;
}
static int hif_multi_tx_confirm(struct wfx_dev *wdev,
const struct hif_msg *hif, const void *buf)
{
const struct hif_cnf_multi_transmit *body = buf;
int i;
WARN(body->num_tx_confs <= 0, "corrupted message");
for (i = 0; i < body->num_tx_confs; i++)
wfx_tx_confirm_cb(wdev, &body->tx_conf_payload[i]);
return 0;
}
static int hif_startup_indication(struct wfx_dev *wdev,
const struct hif_msg *hif, const void *buf)
{
const struct hif_ind_startup *body = buf;
if (body->status || body->firmware_type > 4) {
dev_err(wdev->dev, "received invalid startup indication");
return -EINVAL;
}
memcpy(&wdev->hw_caps, body, sizeof(struct hif_ind_startup));
le16_to_cpus((__le16 *)&wdev->hw_caps.hardware_id);
le16_to_cpus((__le16 *)&wdev->hw_caps.num_inp_ch_bufs);
le16_to_cpus((__le16 *)&wdev->hw_caps.size_inp_ch_buf);
le32_to_cpus((__le32 *)&wdev->hw_caps.supported_rate_mask);
complete(&wdev->firmware_ready);
return 0;
}
static int hif_wakeup_indication(struct wfx_dev *wdev,
const struct hif_msg *hif, const void *buf)
{
if (!wdev->pdata.gpio_wakeup ||
gpiod_get_value(wdev->pdata.gpio_wakeup) == 0) {
dev_warn(wdev->dev, "unexpected wake-up indication\n");
return -EIO;
}
return 0;
}
static int hif_receive_indication(struct wfx_dev *wdev,
const struct hif_msg *hif,
const void *buf, struct sk_buff *skb)
{
struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
const struct hif_ind_rx *body = buf;
if (!wvif) {
dev_warn(wdev->dev, "%s: ignore rx data for non-existent vif %d\n",
__func__, hif->interface);
return -EIO;
}
skb_pull(skb, sizeof(struct hif_msg) + sizeof(struct hif_ind_rx));
wfx_rx_cb(wvif, body, skb);
return 0;
}
static int hif_event_indication(struct wfx_dev *wdev,
const struct hif_msg *hif, const void *buf)
{
struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
const struct hif_ind_event *body = buf;
int type = le32_to_cpu(body->event_id);
if (!wvif) {
dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
return -EIO;
}
switch (type) {
case HIF_EVENT_IND_RCPI_RSSI:
wfx_event_report_rssi(wvif, body->event_data.rcpi_rssi);
break;
case HIF_EVENT_IND_BSSLOST:
schedule_delayed_work(&wvif->beacon_loss_work, 0);
break;
case HIF_EVENT_IND_BSSREGAINED:
cancel_delayed_work(&wvif->beacon_loss_work);
dev_dbg(wdev->dev, "ignore BSSREGAINED indication\n");
break;
case HIF_EVENT_IND_PS_MODE_ERROR:
dev_warn(wdev->dev, "error while processing power save request: %d\n",
le32_to_cpu(body->event_data.ps_mode_error));
break;
default:
dev_warn(wdev->dev, "unhandled event indication: %.2x\n",
type);
break;
}
return 0;
}
static int hif_pm_mode_complete_indication(struct wfx_dev *wdev,
const struct hif_msg *hif,
const void *buf)
{
struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
if (!wvif) {
dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
return -EIO;
}
complete(&wvif->set_pm_mode_complete);
return 0;
}
static int hif_scan_complete_indication(struct wfx_dev *wdev,
const struct hif_msg *hif,
const void *buf)
{
struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
const struct hif_ind_scan_cmpl *body = buf;
if (!wvif) {
dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
return -EIO;
}
wfx_scan_complete(wvif, body->num_channels_completed);
return 0;
}
static int hif_join_complete_indication(struct wfx_dev *wdev,
const struct hif_msg *hif,
const void *buf)
{
struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
if (!wvif) {
dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
return -EIO;
}
dev_warn(wdev->dev, "unattended JoinCompleteInd\n");
return 0;
}
static int hif_suspend_resume_indication(struct wfx_dev *wdev,
const struct hif_msg *hif,
const void *buf)
{
const struct hif_ind_suspend_resume_tx *body = buf;
struct wfx_vif *wvif;
if (body->bc_mc_only) {
wvif = wdev_to_wvif(wdev, hif->interface);
if (!wvif) {
dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
return -EIO;
}
if (body->resume)
wfx_suspend_resume_mc(wvif, STA_NOTIFY_AWAKE);
else
wfx_suspend_resume_mc(wvif, STA_NOTIFY_SLEEP);
} else {
WARN(body->peer_sta_set, "misunderstood indication");
WARN(hif->interface != 2, "misunderstood indication");
if (body->resume)
wfx_suspend_hot_dev(wdev, STA_NOTIFY_AWAKE);
else
wfx_suspend_hot_dev(wdev, STA_NOTIFY_SLEEP);
}
return 0;
}
static int hif_generic_indication(struct wfx_dev *wdev,
const struct hif_msg *hif, const void *buf)
{
const struct hif_ind_generic *body = buf;
int type = le32_to_cpu(body->type);
switch (type) {
case HIF_GENERIC_INDICATION_TYPE_RAW:
return 0;
case HIF_GENERIC_INDICATION_TYPE_STRING:
dev_info(wdev->dev, "firmware says: %s\n", (char *)&body->data);
return 0;
case HIF_GENERIC_INDICATION_TYPE_RX_STATS:
mutex_lock(&wdev->rx_stats_lock);
// Older firmware send a generic indication beside RxStats
if (!wfx_api_older_than(wdev, 1, 4))
dev_info(wdev->dev, "Rx test ongoing. Temperature: %d degrees C\n",
body->data.rx_stats.current_temp);
memcpy(&wdev->rx_stats, &body->data.rx_stats,
sizeof(wdev->rx_stats));
mutex_unlock(&wdev->rx_stats_lock);
return 0;
case HIF_GENERIC_INDICATION_TYPE_TX_POWER_LOOP_INFO:
mutex_lock(&wdev->tx_power_loop_info_lock);
memcpy(&wdev->tx_power_loop_info,
&body->data.tx_power_loop_info,
sizeof(wdev->tx_power_loop_info));
mutex_unlock(&wdev->tx_power_loop_info_lock);
return 0;
default:
dev_err(wdev->dev, "generic_indication: unknown indication type: %#.8x\n",
type);
return -EIO;
}
}
static const struct {
int val;
const char *str;
bool has_param;
} hif_errors[] = {
{ HIF_ERROR_FIRMWARE_ROLLBACK,
"rollback status" },
{ HIF_ERROR_FIRMWARE_DEBUG_ENABLED,
"debug feature enabled" },
{ HIF_ERROR_PDS_PAYLOAD,
"PDS version is not supported" },
{ HIF_ERROR_PDS_TESTFEATURE,
"PDS ask for an unknown test mode" },
{ HIF_ERROR_OOR_VOLTAGE,
"out-of-range power supply voltage", true },
{ HIF_ERROR_OOR_TEMPERATURE,
"out-of-range temperature", true },
{ HIF_ERROR_SLK_REQ_DURING_KEY_EXCHANGE,
"secure link does not expect request during key exchange" },
{ HIF_ERROR_SLK_SESSION_KEY,
"secure link session key is invalid" },
{ HIF_ERROR_SLK_OVERFLOW,
"secure link overflow" },
{ HIF_ERROR_SLK_WRONG_ENCRYPTION_STATE,
"secure link messages list does not match message encryption" },
{ HIF_ERROR_SLK_UNCONFIGURED,
"secure link not yet configured" },
{ HIF_ERROR_HIF_BUS_FREQUENCY_TOO_LOW,
"bus clock is too slow (<1kHz)" },
{ HIF_ERROR_HIF_RX_DATA_TOO_LARGE,
"HIF message too large" },
// Following errors only exists in old firmware versions:
{ HIF_ERROR_HIF_TX_QUEUE_FULL,
"HIF messages queue is full" },
{ HIF_ERROR_HIF_BUS,
"HIF bus" },
{ HIF_ERROR_SLK_MULTI_TX_UNSUPPORTED,
"secure link does not support multi-tx confirmations" },
{ HIF_ERROR_SLK_OUTDATED_SESSION_KEY,
"secure link session key is outdated" },
{ HIF_ERROR_SLK_DECRYPTION,
"secure link params (nonce or tag) mismatch" },
};
static int hif_error_indication(struct wfx_dev *wdev,
const struct hif_msg *hif, const void *buf)
{
const struct hif_ind_error *body = buf;
int type = le32_to_cpu(body->type);
int param = (s8)body->data[0];
int i;
for (i = 0; i < ARRAY_SIZE(hif_errors); i++)
if (type == hif_errors[i].val)
break;
if (i < ARRAY_SIZE(hif_errors))
if (hif_errors[i].has_param)
dev_err(wdev->dev, "asynchronous error: %s: %d\n",
hif_errors[i].str, param);
else
dev_err(wdev->dev, "asynchronous error: %s\n",
hif_errors[i].str);
else
dev_err(wdev->dev, "asynchronous error: unknown: %08x\n", type);
print_hex_dump(KERN_INFO, "hif: ", DUMP_PREFIX_OFFSET,
16, 1, hif, le16_to_cpu(hif->len), false);
wdev->chip_frozen = true;
return 0;
};
static int hif_exception_indication(struct wfx_dev *wdev,
const struct hif_msg *hif, const void *buf)
{
const struct hif_ind_exception *body = buf;
int type = le32_to_cpu(body->type);
if (type == 4)
dev_err(wdev->dev, "firmware assert %d\n",
le32_to_cpup((__le32 *)body->data));
else
dev_err(wdev->dev, "firmware exception\n");
print_hex_dump(KERN_INFO, "hif: ", DUMP_PREFIX_OFFSET,
16, 1, hif, le16_to_cpu(hif->len), false);
wdev->chip_frozen = true;
return -1;
}
static const struct {
int msg_id;
int (*handler)(struct wfx_dev *wdev,
const struct hif_msg *hif, const void *buf);
} hif_handlers[] = {
/* Confirmations */
{ HIF_CNF_ID_TX, hif_tx_confirm },
{ HIF_CNF_ID_MULTI_TRANSMIT, hif_multi_tx_confirm },
/* Indications */
{ HIF_IND_ID_STARTUP, hif_startup_indication },
{ HIF_IND_ID_WAKEUP, hif_wakeup_indication },
{ HIF_IND_ID_JOIN_COMPLETE, hif_join_complete_indication },
{ HIF_IND_ID_SET_PM_MODE_CMPL, hif_pm_mode_complete_indication },
{ HIF_IND_ID_SCAN_CMPL, hif_scan_complete_indication },
{ HIF_IND_ID_SUSPEND_RESUME_TX, hif_suspend_resume_indication },
{ HIF_IND_ID_EVENT, hif_event_indication },
{ HIF_IND_ID_GENERIC, hif_generic_indication },
{ HIF_IND_ID_ERROR, hif_error_indication },
{ HIF_IND_ID_EXCEPTION, hif_exception_indication },
// FIXME: allocate skb_p from hif_receive_indication and make it generic
//{ HIF_IND_ID_RX, hif_receive_indication },
};
void wfx_handle_rx(struct wfx_dev *wdev, struct sk_buff *skb)
{
int i;
const struct hif_msg *hif = (const struct hif_msg *)skb->data;
int hif_id = hif->id;
if (hif_id == HIF_IND_ID_RX) {
// hif_receive_indication take care of skb lifetime
hif_receive_indication(wdev, hif, hif->body, skb);
return;
}
// Note: mutex_is_lock cause an implicit memory barrier that protect
// buf_send
if (mutex_is_locked(&wdev->hif_cmd.lock) &&
wdev->hif_cmd.buf_send &&
wdev->hif_cmd.buf_send->id == hif_id) {
hif_generic_confirm(wdev, hif, hif->body);
goto free;
}
for (i = 0; i < ARRAY_SIZE(hif_handlers); i++) {
if (hif_handlers[i].msg_id == hif_id) {
if (hif_handlers[i].handler)
hif_handlers[i].handler(wdev, hif, hif->body);
goto free;
}
}
if (hif_id & 0x80)
dev_err(wdev->dev, "unsupported HIF indication: ID %02x\n",
hif_id);
else
dev_err(wdev->dev, "unexpected HIF confirmation: ID %02x\n",
hif_id);
free:
dev_kfree_skb(skb);
}
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