rtlwifi: Fix build errors for unusual cases

The present build configuration for the rtlwifi family of drivers will
fail under two known conditions:

(1) If rtlwifi is selected without selecting any of the dependent drivers,
there are errors in the build.
(2) If the PCI drivers are built into the kernel and the USB drivers are modules,
or vice versa, there are missing globals.

The first condition is fixed by never building rtlwifi unless at least one
of the device drivers is selected. The second failure is fixed by splitting
the PCI and USB codes out of rtlwifi, and creating their own mini drivers.
If the drivers that use them are modules, they will also be modules.

Although a number of files are touched by this patch, only Makefile and Kconfig
have undergone significant changes. The only modifications to the other files
were to export entry points needed by the new rtl_pci and rtl_usb units, or to
rename two variables that had names that were likely to cause namespace collisions.

Reported-by: Fengguang Wu <[e-mail]> [Condition 1]
Reported-by: Ben Hutchings <[e-mail]> [Condition 2]
Signed-off-by: Larry Finger <[e-mail]>
Cc: Ben Hutchings <[e-mail]>
Cc: Fengguang Wu <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

drivers/net/wireless/rtlwifi/Kconfig

···
-config RTLWIFI
-	tristate "Realtek wireless card support"
-	depends on MAC80211
-	select FW_LOADER
+menuconfig RTL_CARDS
+	tristate "Realtek rtlwifi family of devices"
+	depends on MAC80211 && (PCI || USB)
+	default y
 	---help---
-	  This is common code for RTL8192CE/RTL8192CU/RTL8192SE/RTL8723AE
-	  drivers.  This module does nothing by itself - the various front-end
-	  drivers need to be enabled to support any desired devices.
+	  This option will enable support for the Realtek mac80211-based
+	  wireless drivers. Drivers rtl8192ce, rtl8192cu, rtl8192se, rtl8192de,
+	  rtl8723eu, and rtl8188eu share some common code.
 
-	  If you choose to build as a module, it'll be called rtlwifi.
+if RTL_CARDS
+
+config RTL8192CE
+	tristate "Realtek RTL8192CE/RTL8188CE Wireless Network Adapter"
+	depends on PCI
+	select RTL8192C_COMMON
+	select RTLWIFI
+	select RTLWIFI_PCI
+	---help---
+	This is the driver for Realtek RTL8192CE/RTL8188CE 802.11n PCIe
+	wireless network adapters.
+
+	If you choose to build it as a module, it will be called rtl8192ce
+
+config RTL8192SE
+	tristate "Realtek RTL8192SE/RTL8191SE PCIe Wireless Network Adapter"
+	depends on PCI
+	select RTLWIFI
+	select RTLWIFI_PCI
+	---help---
+	This is the driver for Realtek RTL8192SE/RTL8191SE 802.11n PCIe
+	wireless network adapters.
+
+	If you choose to build it as a module, it will be called rtl8192se
+
+config RTL8192DE
+	tristate "Realtek RTL8192DE/RTL8188DE PCIe Wireless Network Adapter"
+	depends on PCI
+	select RTLWIFI
+	select RTLWIFI_PCI
+	---help---
+	This is the driver for Realtek RTL8192DE/RTL8188DE 802.11n PCIe
+	wireless network adapters.
+
+	If you choose to build it as a module, it will be called rtl8192de
+
+config RTL8723AE
+	tristate "Realtek RTL8723AE PCIe Wireless Network Adapter"
+	depends on PCI
+	select RTLWIFI
+	select RTLWIFI_PCI
+	---help---
+	This is the driver for Realtek RTL8723AE 802.11n PCIe
+	wireless network adapters.
+
+	If you choose to build it as a module, it will be called rtl8723ae
+
+config RTL8188EE
+	tristate "Realtek RTL8188EE Wireless Network Adapter"
+	depends on PCI
+	select RTLWIFI
+	select RTLWIFI_PCI
+	---help---
+	This is the driver for Realtek RTL8188EE 802.11n PCIe
+	wireless network adapters.
+
+	If you choose to build it as a module, it will be called rtl8188ee
+
+config RTL8192CU
+	tristate "Realtek RTL8192CU/RTL8188CU USB Wireless Network Adapter"
+	depends on USB
+	select RTLWIFI
+	select RTLWIFI_USB
+	select RTL8192C_COMMON
+	---help---
+	This is the driver for Realtek RTL8192CU/RTL8188CU 802.11n USB
+	wireless network adapters.
+
+	If you choose to build it as a module, it will be called rtl8192cu
+
+config RTLWIFI
+	tristate
+	select FW_LOADER
+
+config RTLWIFI_PCI
+	tristate
+
+config RTLWIFI_USB
+	tristate
 
 config RTLWIFI_DEBUG
 	bool "Debugging output for rtlwifi driver family"
···
 	the front-end driver, this parameter must be "Y". For memory-limited
 	systems, choose "N". If in doubt, choose "Y".
 
-config RTL8192CE
-	tristate "Realtek RTL8192CE/RTL8188CE Wireless Network Adapter"
-	depends on RTLWIFI && PCI
-	select RTL8192C_COMMON
-	---help---
-	This is the driver for Realtek RTL8192CE/RTL8188CE 802.11n PCIe
-	wireless network adapters.
-
-	If you choose to build it as a module, it will be called rtl8192ce
-
-config RTL8192SE
-	tristate "Realtek RTL8192SE/RTL8191SE PCIe Wireless Network Adapter"
-	depends on RTLWIFI && PCI
-	---help---
-	This is the driver for Realtek RTL8192SE/RTL8191SE 802.11n PCIe
-	wireless network adapters.
-
-	If you choose to build it as a module, it will be called rtl8192se
-
-config RTL8192DE
-	tristate "Realtek RTL8192DE/RTL8188DE PCIe Wireless Network Adapter"
-	depends on RTLWIFI && PCI
-	---help---
-	This is the driver for Realtek RTL8192DE/RTL8188DE 802.11n PCIe
-	wireless network adapters.
-
-	If you choose to build it as a module, it will be called rtl8192de
-
-config RTL8723AE
-	tristate "Realtek RTL8723AE PCIe Wireless Network Adapter"
-	depends on RTLWIFI && PCI
-	---help---
-	This is the driver for Realtek RTL8723AE 802.11n PCIe
-	wireless network adapters.
-
-	If you choose to build it as a module, it will be called rtl8723ae
-
-config RTL8188EE
-	tristate "Realtek RTL8188EE Wireless Network Adapter"
-	depends on RTLWIFI && PCI
-	---help---
-	This is the driver for Realtek RTL8188EE 802.11n PCIe
-	wireless network adapters.
-
-	If you choose to build it as a module, it will be called rtl8188ee
-
-config RTL8192CU
-	tristate "Realtek RTL8192CU/RTL8188CU USB Wireless Network Adapter"
-	depends on RTLWIFI && USB
-	select RTL8192C_COMMON
-	---help---
-	This is the driver for Realtek RTL8192CU/RTL8188CU 802.11n USB
-	wireless network adapters.
-
-	If you choose to build it as a module, it will be called rtl8192cu
-
 config RTL8192C_COMMON
 	tristate
 	depends on RTL8192CE || RTL8192CU
-	default m
+	default y
+
+endif

drivers/net/wireless/rtlwifi/Makefile

···
 
 rtl8192c_common-objs +=		\
 
-ifneq ($(CONFIG_PCI),)
-rtlwifi-objs	+= pci.o
-endif
+obj-$(CONFIG_RTLWIFI_PCI)	+= rtl_pci.o
+rtl_pci-objs	:=		pci.o
 
-ifneq ($(CONFIG_USB),)
-rtlwifi-objs	+= usb.o
-endif
+obj-$(CONFIG_RTLWIFI_USB)	+= rtl_usb.o
+rtl_usb-objs	:=		usb.o
 
 obj-$(CONFIG_RTL8192C_COMMON)	+= rtl8192c/
 obj-$(CONFIG_RTL8192CE)		+= rtl8192ce/

drivers/net/wireless/rtlwifi/base.c

···
 {
 	return tid_to_ac[tid];
 }
+EXPORT_SYMBOL_GPL(rtl_tid_to_ac);
 
 static void _rtl_init_hw_ht_capab(struct ieee80211_hw *hw,
 				  struct ieee80211_sta_ht_cap *ht_cap)
···
 	cancel_delayed_work(&rtlpriv->works.ps_rfon_wq);
 	cancel_delayed_work(&rtlpriv->works.fwevt_wq);
 }
+EXPORT_SYMBOL_GPL(rtl_deinit_deferred_work);
 
 void rtl_init_rfkill(struct ieee80211_hw *hw)
 {
···
 {
 	wiphy_rfkill_stop_polling(hw->wiphy);
 }
+EXPORT_SYMBOL_GPL(rtl_deinit_rfkill);
 
 int rtl_init_core(struct ieee80211_hw *hw)
 {
···
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(rtl_init_core);
 
 void rtl_deinit_core(struct ieee80211_hw *hw)
 {
 }
+EXPORT_SYMBOL_GPL(rtl_deinit_core);
 
 void rtl_init_rx_config(struct ieee80211_hw *hw)
 {
···
 
 	rtlpriv->cfg->ops->get_hw_reg(hw, HW_VAR_RCR, (u8 *) (&mac->rx_conf));
 }
+EXPORT_SYMBOL_GPL(rtl_init_rx_config);
 
 /*********************************************************
  *
···
 
 	return true;
 }
+EXPORT_SYMBOL_GPL(rtl_tx_mgmt_proc);
 
 void rtl_get_tcb_desc(struct ieee80211_hw *hw,
 		      struct ieee80211_tx_info *info,
···
 
 	return true;
 }
+EXPORT_SYMBOL_GPL(rtl_action_proc);
 
 /*should call before software enc*/
 u8 rtl_is_special_data(struct ieee80211_hw *hw, struct sk_buff *skb, u8 is_tx)
···
 
 	return false;
 }
+EXPORT_SYMBOL_GPL(rtl_is_special_data);
 
 /*********************************************************
  *
···
 
 	rtlpriv->link_info.bcn_rx_inperiod++;
 }
+EXPORT_SYMBOL_GPL(rtl_beacon_statistic);
 
 void rtl_watchdog_wq_callback(void *data)
 {
···
 
 	mac->vendor = vendor;
 }
+EXPORT_SYMBOL_GPL(rtl_recognize_peer);
 
 /*********************************************************
  *
···
 	.name = "rtlsysfs",
 	.attrs = rtl_sysfs_entries,
 };
+EXPORT_SYMBOL_GPL(rtl_attribute_group);
 
 MODULE_AUTHOR("lizhaoming	<[e-mail]>");
 MODULE_AUTHOR("Realtek WlanFAE	<[e-mail]>");
···
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Realtek 802.11n PCI wireless core");
 
-struct rtl_global_var global_var = {};
+struct rtl_global_var rtl_global_var = {};
+EXPORT_SYMBOL_GPL(rtl_global_var);
 
 static int __init rtl_core_module_init(void)
 {
···
 		pr_err("Unable to register rtl_rc, use default RC !!\n");
 
 	/* init some global vars */
-	INIT_LIST_HEAD(&global_var.glb_priv_list);
-	spin_lock_init(&global_var.glb_list_lock);
+	INIT_LIST_HEAD(&rtl_global_var.glb_priv_list);
+	spin_lock_init(&rtl_global_var.glb_list_lock);
 
 	return 0;
 }

drivers/net/wireless/rtlwifi/base.h

···
 u8 rtl_tid_to_ac(u8 tid);
 extern struct attribute_group rtl_attribute_group;
 void rtl_easy_concurrent_retrytimer_callback(unsigned long data);
-extern struct rtl_global_var global_var;
+extern struct rtl_global_var rtl_global_var;
 int rtlwifi_rate_mapping(struct ieee80211_hw *hw,
 			 bool isht, u8 desc_rate, bool first_ampdu);
 bool rtl_tx_mgmt_proc(struct ieee80211_hw *hw, struct sk_buff *skb);

drivers/net/wireless/rtlwifi/core.c

···
 	.rfkill_poll = rtl_op_rfkill_poll,
 	.flush = rtl_op_flush,
 };
+EXPORT_SYMBOL_GPL(rtl_ops);

drivers/net/wireless/rtlwifi/debug.c

···
 
 	/*Init Debug flag enable condition */
 }
+EXPORT_SYMBOL_GPL(rtl_dbgp_flag_init);

drivers/net/wireless/rtlwifi/efuse.c

···
 
 	*pbuf = (u8) (value32 & 0xff);
 }
+EXPORT_SYMBOL_GPL(read_efuse_byte);
 
 void read_efuse(struct ieee80211_hw *hw, u16 _offset, u16 _size_byte, u8 *pbuf)
 {

drivers/net/wireless/rtlwifi/pci.c

···
 #include "efuse.h"
 #include <linux/export.h>
 #include <linux/kmemleak.h>
+#include <linux/module.h>
+
+MODULE_AUTHOR("lizhaoming	<[e-mail]>");
+MODULE_AUTHOR("Realtek WlanFAE	<[e-mail]>");
+MODULE_AUTHOR("Larry Finger	<[e-mail]>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("PCI basic driver for rtlwifi");
 
 static const u16 pcibridge_vendors[PCI_BRIDGE_VENDOR_MAX] = {
 	PCI_VENDOR_ID_INTEL,
···
 	rtlpriv->rtlhal.interface = INTF_PCI;
 	rtlpriv->cfg = (struct rtl_hal_cfg *)(id->driver_data);
 	rtlpriv->intf_ops = &rtl_pci_ops;
-	rtlpriv->glb_var = &global_var;
+	rtlpriv->glb_var = &rtl_global_var;
 
 	/*
 	 *init dbgp flags before all

drivers/net/wireless/rtlwifi/ps.c

···
 
 	spin_unlock_irqrestore(&rtlpriv->locks.ips_lock, flags);
 }
+EXPORT_SYMBOL_GPL(rtl_ips_nic_on);
 
 /*for FW LPS*/
 
···
 			 "u_bufferd: %x, m_buffered: %x\n", u_buffed, m_buffed);
 	}
 }
+EXPORT_SYMBOL_GPL(rtl_swlps_beacon);
 
 void rtl_swlps_rf_awake(struct ieee80211_hw *hw)
 {
···
 	else
 		rtl_lps_leave(hw);
 }
+EXPORT_SYMBOL_GPL(rtl_lps_change_work_callback);
 
 void rtl_swlps_wq_callback(void *data)
 {
···
 	else
 		rtl_p2p_noa_ie(hw, data, len - FCS_LEN);
 }
+EXPORT_SYMBOL_GPL(rtl_p2p_info);

drivers/net/wireless/rtlwifi/usb.c

···
 #include "ps.h"
 #include "rtl8192c/fw_common.h"
 #include <linux/export.h>
+#include <linux/module.h>
+
+MODULE_AUTHOR("lizhaoming	<[e-mail]>");
+MODULE_AUTHOR("Realtek WlanFAE	<[e-mail]>");
+MODULE_AUTHOR("Larry Finger	<[e-mail]>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("USB basic driver for rtlwifi");
 
 #define	REALTEK_USB_VENQT_READ			0xC0
 #define	REALTEK_USB_VENQT_WRITE			0x40