Add 'driver' connector

Add a new one connector that provide access to the HW via driver
debugging interface. In fact this is a class of connectors, where only
one of them is actually build depending on a target operation system.
Such per-OS approach was selected since OSs usually have too different
debug interface and keeping them in a signle source file with a lot of
ifdefs is senseless. So, one source file per-OS and build only one of
them. But each such source file should use common 'con_driver'
descriptor to simplify (avoid ifdefs) generic utility code.

At the moment only Linux ath9k and ath10k drivers are supported (via
their debugfs raw register access interfaces). All other Linux drivers
as well as xBSD drivers do not have any suitable direct HW access
interface.

Accessing hardware via the debugfs is deadly slow, but anyway it faster
then rebuild the kernel in case if you have builtin driver debugfs
support, but have no '/dev/mem' I/O memory access interface (e.g. on
latest OpenWrt builds).

Author: rsa9000

Makefile

@@ -19,12 +19,22 @@ DEP=$(OBJ:%.o=%.d)
 
 DEFS=
 
+OS?=$(shell uname -s)
 HAVE_LIBPCIACCESS=$(shell pkg-config pciaccess && echo y || echo n)
 
+CONFIG_CON_DRIVER?=$(if $(filter Linux,$(OS)),y)
 CONFIG_CON_PCI?=$(HAVE_LIBPCIACCESS)
 CONFIG_CON_MEM?=y
 CONFIG_I_KNOW_WHAT_I_AM_DOING?=n
 
+ifeq ($(CONFIG_CON_DRIVER),y)
+  ifeq ($(OS),Linux)
+    DEFS+=-DCONFIG_CON_DRIVER
+    OBJ+=con_driver_linux.o
+  else
+    $(error Driver connector building was requested, but there are no driver access support for OS $(OS))
+  endif
+endif
 ifeq ($(CONFIG_CON_PCI),y)
 DEFS+=-DCONFIG_CON_PCI
 OBJ+=con_pci.o

atheepmgr.c

@@ -642,10 +642,17 @@ static const struct action {
 #define CON_USAGE_PCI		""
 #define CON_OPTSTR_PCI		""
 #endif
+#if defined(CONFIG_CON_DRIVER)
+#define CON_USAGE_DRIVER	" | -D <dev>"
+#define CON_OPTSTR_DRIVER	"D:"
+#else
+#define CON_USAGE_DRIVER	""
+#define CON_OPTSTR_DRIVER	""
+#endif
 
-#define CON_OPTSTR	"F:" CON_OPTSTR_MEM CON_OPTSTR_PCI
-#if defined(CONFIG_CON_MEM) || defined(CONFIG_CON_PCI)
-#define CON_USAGE	"{" CON_USAGE_FILE CON_USAGE_MEM CON_USAGE_PCI "}"
+#define CON_OPTSTR	"F:" CON_OPTSTR_MEM CON_OPTSTR_PCI CON_OPTSTR_DRIVER
+#if defined(CONFIG_CON_MEM) || defined(CONFIG_CON_PCI) || defined(CONFIG_CON_DRIVER)
+#define CON_USAGE	"{" CON_USAGE_FILE CON_USAGE_MEM CON_USAGE_PCI CON_USAGE_DRIVER "}"
 #else
 #define CON_USAGE	CON_USAGE_FILE
 #endif
@@ -778,6 +785,13 @@ static void usage(struct atheepmgr *aem, char *name)
 		"                  utility. If <domain> is omitted then domain 0 will be used.\n"
 		"                  If <func> is omitted then first available function will be\n"
 		"                  used.\n"
+#endif
+#if defined(CONFIG_CON_DRIVER)
+		"  -D <dev>        Use driver debug interface to interact with <dev> card.\n"
+#if defined(__linux__)
+		"                  <dev> could be specified as a cfg80211 phy (e.g. phy0, phy1)\n"
+		"                  or as a network device/interface (e.g. wlan0, wlan1)\n"
+#endif
 #endif
 		"  -t <eepmap>     Override EEPROM map type (see below), this option is required\n"
 		"                  for connectors, without PnP (map type autodetection) support.\n"
@@ -903,6 +917,12 @@ int main(int argc, char *argv[])
 			aem->con = &con_pci;
 			con_arg = optarg;
 			break;
+#endif
+#if defined(CONFIG_CON_DRIVER)
+		case 'D':
+			aem->con = &con_driver;
+			con_arg = optarg;
+			break;
 #endif
 		case 't':
 			user_eepmap = eepmap_find_by_name(optarg);

atheepmgr.h

@@ -275,6 +275,7 @@ struct atheepmgr {
 };
 
 extern const struct connector con_file;
+extern const struct connector con_driver;
 extern const struct connector con_mem;
 extern const struct connector con_pci;
 extern const struct connector con_stub;