cnss_utils: Add support of cnss_utils for WLAN

Add support of cnss_utils for WLAN. Export APIs to WLAN
host driver which are used to set/get WLAN related
information. These information could be retrived later
when WLAN driver is reloaded.

CRs-Fixed: 2060693
Change-Id: I2c8c36602ec8af133946ff00c41ce648a2628041
Signed-off-by: Yuanyuan Liu <yuanliu@codeaurora.org>

drivers/net/wireless/Kconfig

@@ -333,5 +333,6 @@ source "drivers/net/wireless/cw1200/Kconfig"
 source "drivers/net/wireless/rsi/Kconfig"
 source "drivers/net/wireless/cnss/Kconfig"
 source "drivers/net/wireless/cnss_genl/Kconfig"
+source "drivers/net/wireless/cnss_utils/Kconfig"
 
 endif # WLAN

drivers/net/wireless/Makefile

@@ -67,3 +67,4 @@ obj-$(CONFIG_CNSS)	+= cnss/
 obj-$(CONFIG_WCNSS_MEM_PRE_ALLOC) += cnss_prealloc/
 obj-$(CONFIG_CNSS_CRYPTO)	+= cnss_crypto/
 obj-$(CONFIG_CNSS_GENL) += cnss_genl/
+obj-$(CONFIG_CNSS_UTILS) += cnss_utils/

drivers/net/wireless/cnss/Kconfig

@@ -1,5 +1,6 @@
 config CNSS
 	tristate "CNSS driver for wifi module"
+	select CNSS_UTILS
 	select CRYPTO
 	select CRYPTO_HASH
 	select CRYPTO_BLKCIPHER

drivers/net/wireless/cnss_utils/Kconfig

@@ -0,0 +1,6 @@
+config CNSS_UTILS
+	bool "CNSS utilities support"
+	---help---
+	  Add CNSS utilities support for the WLAN driver module.
+	  This feature enable wlan driver to use CNSS utilities APIs to set
+	  and get wlan related information.

drivers/net/wireless/cnss_utils/Makefile

@@ -0,0 +1 @@
+obj-$(CONFIG_CNSS_UTILS) += cnss_utils.o

drivers/net/wireless/cnss_utils/cnss_utils.c

@@ -0,0 +1,310 @@
+/* Copyright (c) 2017 The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) "cnss_utils: " fmt
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/etherdevice.h>
+#include <net/cnss_utils.h>
+
+#define CNSS_MAX_CH_NUM 45
+struct cnss_unsafe_channel_list {
+	u16 unsafe_ch_count;
+	u16 unsafe_ch_list[CNSS_MAX_CH_NUM];
+};
+
+struct cnss_dfs_nol_info {
+	void *dfs_nol_info;
+	u16 dfs_nol_info_len;
+};
+
+#define MAX_NO_OF_MAC_ADDR 4
+struct cnss_wlan_mac_addr {
+	u8 mac_addr[MAX_NO_OF_MAC_ADDR][ETH_ALEN];
+	u32 no_of_mac_addr_set;
+};
+
+static struct cnss_utils_priv {
+	struct cnss_unsafe_channel_list unsafe_channel_list;
+	struct cnss_dfs_nol_info dfs_nol_info;
+	/* generic mutex for unsafe channel */
+	struct mutex unsafe_channel_list_lock;
+	/* generic spin-lock for dfs_nol info */
+	spinlock_t dfs_nol_info_lock;
+	int driver_load_cnt;
+	bool is_wlan_mac_set;
+	struct cnss_wlan_mac_addr wlan_mac_addr;
+	enum cnss_utils_cc_src cc_source;
+} *cnss_utils_priv;
+
+int cnss_utils_set_wlan_unsafe_channel(struct device *dev,
+				       u16 *unsafe_ch_list, u16 ch_count)
+{
+	struct cnss_utils_priv *priv = cnss_utils_priv;
+
+	if (!priv)
+		return -EINVAL;
+
+	mutex_lock(&priv->unsafe_channel_list_lock);
+	if ((!unsafe_ch_list) || (ch_count > CNSS_MAX_CH_NUM)) {
+		mutex_unlock(&priv->unsafe_channel_list_lock);
+		return -EINVAL;
+	}
+
+	priv->unsafe_channel_list.unsafe_ch_count = ch_count;
+
+	if (ch_count == 0)
+		goto end;
+
+	memcpy(priv->unsafe_channel_list.unsafe_ch_list,
+	       unsafe_ch_list, ch_count * sizeof(u16));
+
+end:
+	mutex_unlock(&priv->unsafe_channel_list_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL(cnss_utils_set_wlan_unsafe_channel);
+
+int cnss_utils_get_wlan_unsafe_channel(struct device *dev,
+				       u16 *unsafe_ch_list,
+				       u16 *ch_count, u16 buf_len)
+{
+	struct cnss_utils_priv *priv = cnss_utils_priv;
+
+	if (!priv)
+		return -EINVAL;
+
+	mutex_lock(&priv->unsafe_channel_list_lock);
+	if (!unsafe_ch_list || !ch_count) {
+		mutex_unlock(&priv->unsafe_channel_list_lock);
+		return -EINVAL;
+	}
+
+	if (buf_len <
+	    (priv->unsafe_channel_list.unsafe_ch_count * sizeof(u16))) {
+		mutex_unlock(&priv->unsafe_channel_list_lock);
+		return -ENOMEM;
+	}
+
+	*ch_count = priv->unsafe_channel_list.unsafe_ch_count;
+	memcpy(unsafe_ch_list, priv->unsafe_channel_list.unsafe_ch_list,
+	       priv->unsafe_channel_list.unsafe_ch_count * sizeof(u16));
+	mutex_unlock(&priv->unsafe_channel_list_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL(cnss_utils_get_wlan_unsafe_channel);
+
+int cnss_utils_wlan_set_dfs_nol(struct device *dev,
+				const void *info, u16 info_len)
+{
+	void *temp;
+	void *old_nol_info;
+	struct cnss_dfs_nol_info *dfs_info;
+	struct cnss_utils_priv *priv = cnss_utils_priv;
+
+	if (!priv)
+		return -EINVAL;
+
+	if (!info || !info_len)
+		return -EINVAL;
+
+	temp = kmalloc(info_len, GFP_ATOMIC);
+	if (!temp)
+		return -ENOMEM;
+
+	memcpy(temp, info, info_len);
+	spin_lock_bh(&priv->dfs_nol_info_lock);
+	dfs_info = &priv->dfs_nol_info;
+	old_nol_info = dfs_info->dfs_nol_info;
+	dfs_info->dfs_nol_info = temp;
+	dfs_info->dfs_nol_info_len = info_len;
+	spin_unlock_bh(&priv->dfs_nol_info_lock);
+	kfree(old_nol_info);
+
+	return 0;
+}
+EXPORT_SYMBOL(cnss_utils_wlan_set_dfs_nol);
+
+int cnss_utils_wlan_get_dfs_nol(struct device *dev,
+				void *info, u16 info_len)
+{
+	int len;
+	struct cnss_dfs_nol_info *dfs_info;
+	struct cnss_utils_priv *priv = cnss_utils_priv;
+
+	if (!priv)
+		return -EINVAL;
+
+	if (!info || !info_len)
+		return -EINVAL;
+
+	spin_lock_bh(&priv->dfs_nol_info_lock);
+
+	dfs_info = &priv->dfs_nol_info;
+	if (!dfs_info->dfs_nol_info ||
+	    dfs_info->dfs_nol_info_len == 0) {
+		spin_unlock_bh(&priv->dfs_nol_info_lock);
+		return -ENOENT;
+	}
+
+	len = min(info_len, dfs_info->dfs_nol_info_len);
+	memcpy(info, dfs_info->dfs_nol_info, len);
+	spin_unlock_bh(&priv->dfs_nol_info_lock);
+
+	return len;
+}
+EXPORT_SYMBOL(cnss_utils_wlan_get_dfs_nol);
+
+void cnss_utils_increment_driver_load_cnt(struct device *dev)
+{
+	struct cnss_utils_priv *priv = cnss_utils_priv;
+
+	if (!priv)
+		return;
+
+	++(priv->driver_load_cnt);
+}
+EXPORT_SYMBOL(cnss_utils_increment_driver_load_cnt);
+
+int cnss_utils_get_driver_load_cnt(struct device *dev)
+{
+	struct cnss_utils_priv *priv = cnss_utils_priv;
+
+	if (!priv)
+		return -EINVAL;
+
+	return priv->driver_load_cnt;
+}
+EXPORT_SYMBOL(cnss_utils_get_driver_load_cnt);
+
+int cnss_utils_set_wlan_mac_address(const u8 *in, const uint32_t len)
+{
+	struct cnss_utils_priv *priv = cnss_utils_priv;
+	u32 no_of_mac_addr;
+	struct cnss_wlan_mac_addr *addr = NULL;
+	int iter;
+	u8 *temp = NULL;
+
+	if (!priv)
+		return -EINVAL;
+
+	if (priv->is_wlan_mac_set) {
+		pr_debug("WLAN MAC address is already set\n");
+		return 0;
+	}
+
+	if (len == 0 || (len % ETH_ALEN) != 0) {
+		pr_err("Invalid length %d\n", len);
+		return -EINVAL;
+	}
+
+	no_of_mac_addr = len / ETH_ALEN;
+	if (no_of_mac_addr > MAX_NO_OF_MAC_ADDR) {
+		pr_err("Exceed maximum supported MAC address %u %u\n",
+		       MAX_NO_OF_MAC_ADDR, no_of_mac_addr);
+		return -EINVAL;
+	}
+
+	priv->is_wlan_mac_set = true;
+	addr = &priv->wlan_mac_addr;
+	addr->no_of_mac_addr_set = no_of_mac_addr;
+	temp = &addr->mac_addr[0][0];
+
+	for (iter = 0; iter < no_of_mac_addr;
+	     ++iter, temp += ETH_ALEN, in += ETH_ALEN) {
+		ether_addr_copy(temp, in);
+		pr_debug("MAC_ADDR:%02x:%02x:%02x:%02x:%02x:%02x\n",
+			 temp[0], temp[1], temp[2],
+			 temp[3], temp[4], temp[5]);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(cnss_utils_set_wlan_mac_address);
+
+u8 *cnss_utils_get_wlan_mac_address(struct device *dev, uint32_t *num)
+{
+	struct cnss_utils_priv *priv = cnss_utils_priv;
+	struct cnss_wlan_mac_addr *addr = NULL;
+
+	if (!priv)
+		goto out;
+
+	if (!priv->is_wlan_mac_set) {
+		pr_debug("WLAN MAC address is not set\n");
+		goto out;
+	}
+
+	addr = &priv->wlan_mac_addr;
+	*num = addr->no_of_mac_addr_set;
+	return &addr->mac_addr[0][0];
+out:
+	*num = 0;
+	return NULL;
+}
+EXPORT_SYMBOL(cnss_utils_get_wlan_mac_address);
+
+void cnss_utils_set_cc_source(struct device *dev,
+			      enum cnss_utils_cc_src cc_source)
+{
+	struct cnss_utils_priv *priv = cnss_utils_priv;
+
+	if (!priv)
+		return;
+
+	priv->cc_source = cc_source;
+}
+EXPORT_SYMBOL(cnss_utils_set_cc_source);
+
+enum cnss_utils_cc_src cnss_utils_get_cc_source(struct device *dev)
+{
+	struct cnss_utils_priv *priv = cnss_utils_priv;
+
+	if (!priv)
+		return -EINVAL;
+
+	return priv->cc_source;
+}
+EXPORT_SYMBOL(cnss_utils_get_cc_source);
+
+static int __init cnss_utils_init(void)
+{
+	struct cnss_utils_priv *priv = NULL;
+
+	priv = kmalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->cc_source = CNSS_UTILS_SOURCE_CORE;
+
+	mutex_init(&priv->unsafe_channel_list_lock);
+	spin_lock_init(&priv->dfs_nol_info_lock);
+
+	cnss_utils_priv = priv;
+
+	return 0;
+}
+
+static void __exit cnss_utils_exit(void)
+{
+	kfree(cnss_utils_priv);
+	cnss_utils_priv = NULL;
+}
+
+module_init(cnss_utils_init);
+module_exit(cnss_utils_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION(DEVICE "CNSS Utilities Driver");

drivers/soc/qcom/Kconfig

@@ -468,6 +468,7 @@ config MINIDUMP_MAX_ENTRIES
 
 config ICNSS
 	tristate "Platform driver for Q6 integrated connectivity"
+	select CNSS_UTILS
 	---help---
 	  This module adds support for Q6 integrated WLAN connectivity
 	  subsystem. This module is responsible for communicating WLAN on/off

include/net/cnss_utils.h

@@ -0,0 +1,40 @@
+/* Copyright (c) 2017 The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CNSS_UTILS_H_
+#define _CNSS_UTILS_H_
+
+enum cnss_utils_cc_src {
+	CNSS_UTILS_SOURCE_CORE,
+	CNSS_UTILS_SOURCE_11D,
+	CNSS_UTILS_SOURCE_USER
+};
+
+extern int cnss_utils_set_wlan_unsafe_channel(struct device *dev,
+					      u16 *unsafe_ch_list,
+					      u16 ch_count);
+extern int cnss_utils_get_wlan_unsafe_channel(struct device *dev,
+					      u16 *unsafe_ch_list,
+					      u16 *ch_count, u16 buf_len);
+extern int cnss_utils_wlan_set_dfs_nol(struct device *dev,
+				       const void *info, u16 info_len);
+extern int cnss_utils_wlan_get_dfs_nol(struct device *dev,
+				       void *info, u16 info_len);
+extern int cnss_utils_get_driver_load_cnt(struct device *dev);
+extern void cnss_utils_increment_driver_load_cnt(struct device *dev);
+extern int cnss_utils_set_wlan_mac_address(const u8 *in, uint32_t len);
+extern u8 *cnss_utils_get_wlan_mac_address(struct device *dev, uint32_t *num);
+extern void cnss_utils_set_cc_source(struct device *dev,
+				     enum cnss_utils_cc_src cc_source);
+extern enum cnss_utils_cc_src cnss_utils_get_cc_source(struct device *dev);
+
+#endif