wcn36xx: Add support for Factory Test Mode (FTM)

Introduce infrastructure for supporting Factory Test Mode (FTM) of the
wireless LAN subsystem. In order for the user space to access the
firmware in test mode the relevant netlink channel needs to be exposed
from the kernel driver.

The above is achieved as follows:
1) Register wcn36xx driver to testmode callback from netlink
2) Add testmode callback implementation to handle incoming FTM commands
3) Add FTM command packet structure
4) Add handling for GET_BUILD_RELEASE_NUMBER (msgid=0x32A2)
5) Add generic handling for all PTT_MSG packets

Signed-off-by: Eyal Ilsar <eilsar@codeaurora.org>
Signed-off-by: Ramon Fried <ramon.fried@linaro.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

1 files changed, 149 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/wcn36xx/testmode.c b/drivers/net/wireless/ath/wcn36xx/testmode.c
new file mode 100644
index 000000000000..1279064a3b71
--- /dev/null
+++ b/drivers/net/wireless/ath/wcn36xx/testmode.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <net/netlink.h>
+#include <linux/firmware.h>
+#include <net/cfg80211.h>
+#include "wcn36xx.h"
+
+#include "testmode.h"
+#include "testmode_i.h"
+#include "hal.h"
+#include "smd.h"
+
+static const struct nla_policy wcn36xx_tm_policy[WCN36XX_TM_ATTR_MAX + 1] = {
+	[WCN36XX_TM_ATTR_CMD] = { .type = NLA_U16 },
+	[WCN36XX_TM_ATTR_DATA] = { .type = NLA_BINARY,
+	.len = WCN36XX_TM_DATA_MAX_LEN },
+};
+
+struct build_release_number {
+	u16 drv_major;
+	u16 drv_minor;
+	u16 drv_patch;
+	u16 drv_build;
+	u16 ptt_max;
+	u16 ptt_min;
+	u16 fw_ver;
+} __packed;
+
+static int wcn36xx_tm_cmd_ptt(struct wcn36xx *wcn, struct ieee80211_vif *vif,
+			      struct nlattr *tb[])
+{
+	int ret = 0, buf_len;
+	void *buf;
+	struct ftm_rsp_msg *msg, *rsp = NULL;
+	struct sk_buff *skb;
+
+	if (!tb[WCN36XX_TM_ATTR_DATA])
+		return -EINVAL;
+
+	buf = nla_data(tb[WCN36XX_TM_ATTR_DATA]);
+	buf_len = nla_len(tb[WCN36XX_TM_ATTR_DATA]);
+	msg = (struct ftm_rsp_msg *)buf;
+
+	wcn36xx_dbg(WCN36XX_DBG_TESTMODE,
+		    "testmode cmd wmi msg_id 0x%04X msg_len %d buf %pK buf_len %d\n",
+		   msg->msg_id, msg->msg_body_length,
+		   buf, buf_len);
+
+	wcn36xx_dbg_dump(WCN36XX_DBG_TESTMODE_DUMP, "REQ ", buf, buf_len);
+
+	if (msg->msg_id == MSG_GET_BUILD_RELEASE_NUMBER) {
+		struct build_release_number *body =
+				(struct build_release_number *)
+				msg->msg_response;
+
+		body->drv_major = wcn->fw_major;
+		body->drv_minor = wcn->fw_minor;
+		body->drv_patch = wcn->fw_version;
+		body->drv_build = wcn->fw_revision;
+		body->ptt_max = 10;
+		body->ptt_min = 0;
+
+		rsp = msg;
+		rsp->resp_status = 0;
+	} else {
+		wcn36xx_dbg(WCN36XX_DBG_TESTMODE,
+			    "PPT Request >> HAL size %d\n",
+				msg->msg_body_length);
+
+		msg->resp_status = wcn36xx_smd_process_ptt_msg(wcn, vif, msg,
+							       msg->msg_body_length, (void *)(&rsp));
+
+		wcn36xx_dbg(WCN36XX_DBG_TESTMODE,
+			    "Response status = %d\n",
+				msg->resp_status);
+		if (rsp)
+			wcn36xx_dbg(WCN36XX_DBG_TESTMODE,
+				    "PPT Response << HAL size %d\n",
+					rsp->msg_body_length);
+	}
+
+	if (!rsp) {
+		rsp = msg;
+		wcn36xx_warn("No response! Echoing request with response status %d\n",
+			     rsp->resp_status);
+	}
+	wcn36xx_dbg_dump(WCN36XX_DBG_TESTMODE_DUMP, "RSP ",
+			 rsp, rsp->msg_body_length);
+
+	skb = cfg80211_testmode_alloc_reply_skb(wcn->hw->wiphy,
+						nla_total_size(msg->msg_body_length));
+	if (!skb) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ret = nla_put(skb, WCN36XX_TM_ATTR_DATA, rsp->msg_body_length, rsp);
+	if (ret) {
+		kfree_skb(skb);
+		goto out;
+	}
+
+	ret = cfg80211_testmode_reply(skb);
+
+out:
+	if (rsp != msg)
+		kfree(rsp);
+
+	return ret;
+}
+
+int wcn36xx_tm_cmd(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
+		   void *data, int len)
+{
+	struct wcn36xx *wcn = hw->priv;
+	struct nlattr *tb[WCN36XX_TM_ATTR_MAX + 1];
+	int ret = 0;
+	unsigned short attr;
+
+	wcn36xx_dbg_dump(WCN36XX_DBG_TESTMODE_DUMP, "Data:", data, len);
+	ret = nla_parse(tb, WCN36XX_TM_ATTR_MAX, data, len,
+			wcn36xx_tm_policy, NULL);
+	if (ret)
+		return ret;
+
+	if (!tb[WCN36XX_TM_ATTR_CMD])
+		return -EINVAL;
+
+	attr = nla_get_u16(tb[WCN36XX_TM_ATTR_CMD]);
+
+	if (attr != WCN36XX_TM_CMD_PTT)
+		return -EOPNOTSUPP;
+
+	return wcn36xx_tm_cmd_ptt(wcn, vif, tb);
+}