ath10k: add support for hardware rfkill

When hardware rfkill is enabled in the firmware it will report the
capability via using WMI_TLV_SYS_CAP_INFO_RFKILL bit in the WMI_SERVICE_READY
event to the host. ath10k will check the capability, and if it is enabled then
ath10k will set the GPIO information to firmware using WMI_PDEV_SET_PARAM. When
the firmware detects hardware rfkill is enabled by the user, it will report it
via WMI_RFKILL_STATE_CHANGE_EVENTID. Once ath10k receives the event it will
send wmi command WMI_PDEV_SET_PARAM to the firmware to enable/disable the radio
and also notifies cfg80211.

We can't power off the device when rfkill is enabled, as otherwise the
firmware would not be able to detect GPIO changes and report them to the
host. So when rfkill is enabled, we need to keep the firmware running.

Tested with QCA6174 PCI with firmware
WLAN.RM.4.4.1-00109-QCARMSWPZ-1.

Signed-off-by: Alan Liu <[e-mail]>
Signed-off-by: Wen Gong <[e-mail]>
Signed-off-by: Kalle Valo <[e-mail]>

drivers/net/wireless/ath/ath10k/core.h

···
 	u32 low_5ghz_chan;
 	u32 high_5ghz_chan;
 	bool ani_enabled;
+	u32 sys_cap_info;
+
+	/* protected by data_lock */
+	bool hw_rfkill_on;
+
 	/* protected by conf_mutex */
 	u8 ps_state_enable;
 

drivers/net/wireless/ath/ath10k/hw.c

···
 	.num_target_ce_config_wlan	= 7,
 	.ce_desc_meta_data_mask		= 0xFFFC,
 	.ce_desc_meta_data_lsb		= 2,
+	.rfkill_pin			= 16,
+	.rfkill_cfg			= 0,
+	.rfkill_on_level		= 1,
 };
 
 const struct ath10k_hw_values qca99x0_values = {

drivers/net/wireless/ath/ath10k/hw.h

···
 	u8 num_target_ce_config_wlan;
 	u16 ce_desc_meta_data_mask;
 	u8 ce_desc_meta_data_lsb;
+	u32 rfkill_pin;
+	u32 rfkill_cfg;
+	bool rfkill_on_level;
 };
 
 extern const struct ath10k_hw_values qca988x_values;

drivers/net/wireless/ath/ath10k/mac.c

···
 #include <linux/etherdevice.h>
 #include <linux/acpi.h>
 #include <linux/of.h>
+#include <linux/bitfield.h>
 
 #include "hif.h"
 #include "core.h"
···
 	return 0;
 }
 
+static int ath10k_mac_rfkill_config(struct ath10k *ar)
+{
+	u32 param;
+	int ret;
+
+	if (ar->hw_values->rfkill_pin == 0) {
+		ath10k_warn(ar, "ath10k does not support hardware rfkill with this device\n");
+		return -EOPNOTSUPP;
+	}
+
+	ath10k_dbg(ar, ATH10K_DBG_MAC,
+		   "mac rfkill_pin %d rfkill_cfg %d rfkill_on_level %d",
+		   ar->hw_values->rfkill_pin, ar->hw_values->rfkill_cfg,
+		   ar->hw_values->rfkill_on_level);
+
+	param = FIELD_PREP(WMI_TLV_RFKILL_CFG_RADIO_LEVEL,
+			   ar->hw_values->rfkill_on_level) |
+		FIELD_PREP(WMI_TLV_RFKILL_CFG_GPIO_PIN_NUM,
+			   ar->hw_values->rfkill_pin) |
+		FIELD_PREP(WMI_TLV_RFKILL_CFG_PIN_AS_GPIO,
+			   ar->hw_values->rfkill_cfg);
+
+	ret = ath10k_wmi_pdev_set_param(ar,
+					ar->wmi.pdev_param->rfkill_config,
+					param);
+	if (ret) {
+		ath10k_warn(ar,
+			    "failed to set rfkill config 0x%x: %d\n",
+			    param, ret);
+		return ret;
+	}
+	return 0;
+}
+
+int ath10k_mac_rfkill_enable_radio(struct ath10k *ar, bool enable)
+{
+	enum wmi_tlv_rfkill_enable_radio param;
+	int ret;
+
+	if (enable)
+		param = WMI_TLV_RFKILL_ENABLE_RADIO_ON;
+	else
+		param = WMI_TLV_RFKILL_ENABLE_RADIO_OFF;
+
+	ath10k_dbg(ar, ATH10K_DBG_MAC, "mac rfkill enable %d", param);
+
+	ret = ath10k_wmi_pdev_set_param(ar, ar->wmi.pdev_param->rfkill_enable,
+					param);
+	if (ret) {
+		ath10k_warn(ar, "failed to set rfkill enable param %d: %d\n",
+			    param, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
 static int ath10k_start(struct ieee80211_hw *hw)
 {
 	struct ath10k *ar = hw->priv;
···
 		goto err;
 	}
 
+	spin_lock_bh(&ar->data_lock);
+
+	if (ar->hw_rfkill_on) {
+		ar->hw_rfkill_on = false;
+		spin_unlock_bh(&ar->data_lock);
+		goto err;
+	}
+
+	spin_unlock_bh(&ar->data_lock);
+
 	ret = ath10k_hif_power_up(ar, ATH10K_FIRMWARE_MODE_NORMAL);
 	if (ret) {
 		ath10k_err(ar, "Could not init hif: %d\n", ret);
···
 	if (ret) {
 		ath10k_err(ar, "Could not init core: %d\n", ret);
 		goto err_power_down;
+	}
+
+	if (ar->sys_cap_info & WMI_TLV_SYS_CAP_INFO_RFKILL) {
+		ret = ath10k_mac_rfkill_config(ar);
+		if (ret && ret != -EOPNOTSUPP) {
+			ath10k_warn(ar, "failed to configure rfkill: %d", ret);
+			goto err_core_stop;
+		}
 	}
 
 	param = ar->wmi.pdev_param->pmf_qos;
···
 
 	mutex_lock(&ar->conf_mutex);
 	if (ar->state != ATH10K_STATE_OFF) {
-		ath10k_halt(ar);
+		if (!ar->hw_rfkill_on)
+			ath10k_halt(ar);
 		ar->state = ATH10K_STATE_OFF;
 	}
 	mutex_unlock(&ar->conf_mutex);

drivers/net/wireless/ath/ath10k/mac.h

···
 					    u8 tid);
 int ath10k_mac_ext_resource_config(struct ath10k *ar, u32 val);
 void ath10k_mac_wait_tx_complete(struct ath10k *ar);
+int ath10k_mac_rfkill_enable_radio(struct ath10k *ar, bool enable);
 
 static inline void ath10k_tx_h_seq_no(struct ieee80211_vif *vif,
 				      struct sk_buff *skb)

drivers/net/wireless/ath/ath10k/wmi-tlv.c

···
 	return 0;
 }
 
+static void ath10k_wmi_tlv_event_rfkill_state_change(struct ath10k *ar,
+						     struct sk_buff *skb)
+{
+	const struct wmi_tlv_rfkill_state_change_ev *ev;
+	const void **tb;
+	bool radio;
+	int ret;
+
+	tb = ath10k_wmi_tlv_parse_alloc(ar, skb->data, skb->len, GFP_ATOMIC);
+	if (IS_ERR(tb)) {
+		ret = PTR_ERR(tb);
+		ath10k_warn(ar,
+			    "failed to parse rfkill state change event: %d\n",
+			    ret);
+		return;
+	}
+
+	ev = tb[WMI_TLV_TAG_STRUCT_RFKILL_EVENT];
+	if (!ev) {
+		kfree(tb);
+		return;
+	}
+
+	ath10k_dbg(ar, ATH10K_DBG_MAC,
+		   "wmi tlv rfkill state change gpio %d type %d radio_state %d\n",
+		   __le32_to_cpu(ev->gpio_pin_num),
+		   __le32_to_cpu(ev->int_type),
+		   __le32_to_cpu(ev->radio_state));
+
+	radio = (__le32_to_cpu(ev->radio_state) == WMI_TLV_RFKILL_RADIO_STATE_ON);
+
+	spin_lock_bh(&ar->data_lock);
+
+	if (!radio)
+		ar->hw_rfkill_on = true;
+
+	spin_unlock_bh(&ar->data_lock);
+
+	/* notify cfg80211 radio state change */
+	ath10k_mac_rfkill_enable_radio(ar, radio);
+	wiphy_rfkill_set_hw_state(ar->hw->wiphy, !radio);
+}
+
 static int ath10k_wmi_tlv_event_temperature(struct ath10k *ar,
 					    struct sk_buff *skb)
 {
···
 		break;
 	case WMI_TLV_TX_PAUSE_EVENTID:
 		ath10k_wmi_tlv_event_tx_pause(ar, skb);
+		break;
+	case WMI_TLV_RFKILL_STATE_CHANGE_EVENTID:
+		ath10k_wmi_tlv_event_rfkill_state_change(ar, skb);
 		break;
 	case WMI_TLV_PDEV_TEMPERATURE_EVENTID:
 		ath10k_wmi_tlv_event_temperature(ar, skb);
···
 	arg->num_mem_reqs = ev->num_mem_reqs;
 	arg->service_map = svc_bmap;
 	arg->service_map_len = ath10k_wmi_tlv_len(svc_bmap);
+	arg->sys_cap_info = ev->sys_cap_info;
 
 	ret = ath10k_wmi_tlv_iter(ar, mem_reqs, ath10k_wmi_tlv_len(mem_reqs),
 				  ath10k_wmi_tlv_parse_mem_reqs, arg);
···
 	.wapi_mbssid_offset = WMI_PDEV_PARAM_UNSUPPORTED,
 	.arp_srcaddr = WMI_PDEV_PARAM_UNSUPPORTED,
 	.arp_dstaddr = WMI_PDEV_PARAM_UNSUPPORTED,
+	.rfkill_config = WMI_TLV_PDEV_PARAM_HW_RFKILL_CONFIG,
+	.rfkill_enable = WMI_TLV_PDEV_PARAM_RFKILL_ENABLE,
 };
 
 static struct wmi_peer_param_map wmi_tlv_peer_param_map = {

drivers/net/wireless/ath/ath10k/wmi-tlv.h

···
 #ifndef _WMI_TLV_H
 #define _WMI_TLV_H
 
+#include <linux/bitops.h>
+
 #define WMI_TLV_CMD(grp_id) (((grp_id) << 12) | 0x1)
 #define WMI_TLV_EV(grp_id) (((grp_id) << 12) | 0x1)
 #define WMI_TLV_CMD_UNSUPPORTED 0
···
 	__le32 peer_reason;
 	__le32 vdev_id;
 } __packed;
+
+enum wmi_tlv_sys_cap_info_flags {
+	WMI_TLV_SYS_CAP_INFO_RXTX_LED	= BIT(0),
+	WMI_TLV_SYS_CAP_INFO_RFKILL	= BIT(1),
+};
+
+#define WMI_TLV_RFKILL_CFG_GPIO_PIN_NUM		GENMASK(5, 0)
+#define WMI_TLV_RFKILL_CFG_RADIO_LEVEL		BIT(6)
+#define WMI_TLV_RFKILL_CFG_PIN_AS_GPIO		GENMASK(10, 7)
+
+enum wmi_tlv_rfkill_enable_radio {
+	WMI_TLV_RFKILL_ENABLE_RADIO_ON	= 0,
+	WMI_TLV_RFKILL_ENABLE_RADIO_OFF	= 1,
+};
+
+enum wmi_tlv_rfkill_radio_state {
+	WMI_TLV_RFKILL_RADIO_STATE_OFF	= 1,
+	WMI_TLV_RFKILL_RADIO_STATE_ON	= 2,
+};
+
+struct wmi_tlv_rfkill_state_change_ev {
+	__le32 gpio_pin_num;
+	__le32 int_type;
+	__le32 radio_state;
+};
 
 void ath10k_wmi_tlv_attach(struct ath10k *ar);
 

drivers/net/wireless/ath/ath10k/wmi.c

···
 	arg->service_map = ev->wmi_service_bitmap;
 	arg->service_map_len = sizeof(ev->wmi_service_bitmap);
 
+	/* Deliberately skipping ev->sys_cap_info as WMI and WMI-TLV have
+	 * different values. We would need a translation to handle that,
+	 * but as we don't currently need anything from sys_cap_info from
+	 * WMI interface (only from WMI-TLV) safest it to skip it.
+	 */
+
 	n = min_t(size_t, __le32_to_cpu(arg->num_mem_reqs),
 		  ARRAY_SIZE(arg->mem_reqs));
 	for (i = 0; i < n; i++)
···
 	ar->high_2ghz_chan = __le32_to_cpu(arg.high_2ghz_chan);
 	ar->low_5ghz_chan = __le32_to_cpu(arg.low_5ghz_chan);
 	ar->high_5ghz_chan = __le32_to_cpu(arg.high_5ghz_chan);
+	ar->sys_cap_info = __le32_to_cpu(arg.sys_cap_info);
 
 	ath10k_dbg_dump(ar, ATH10K_DBG_WMI, NULL, "wmi svc: ",
 			arg.service_map, arg.service_map_len);
+	ath10k_dbg(ar, ATH10K_DBG_WMI, "wmi sys_cap_info 0x%x\n",
+		   ar->sys_cap_info);
 
 	if (ar->num_rf_chains > ar->max_spatial_stream) {
 		ath10k_warn(ar, "hardware advertises support for more spatial streams than it should (%d > %d)\n",

drivers/net/wireless/ath/ath10k/wmi.h

···
 	u32 arp_srcaddr;
 	u32 arp_dstaddr;
 	u32 enable_btcoex;
+	u32 rfkill_config;
+	u32 rfkill_enable;
 };
 
 #define WMI_PDEV_PARAM_UNSUPPORTED 0
···
 	__le32 high_2ghz_chan;
 	__le32 low_5ghz_chan;
 	__le32 high_5ghz_chan;
+	__le32 sys_cap_info;
 	const __le32 *service_map;
 	size_t service_map_len;
 	const struct wlan_host_mem_req *mem_reqs[WMI_MAX_MEM_REQS];