Phonet: Implement Pipe Controller to support Nokia Slim Modems

Phonet stack assumes the presence of Pipe Controller, either in Modem or
on Application Processing Engine user-space for the Pipe data.
Nokia Slim Modems like WG2.5 used in ST-Ericsson U8500 platform do not
implement Pipe controller in them.
This patch adds Pipe Controller implemenation to Phonet stack to support
Pipe data over Phonet stack for Nokia Slim Modems.

Signed-off-by: Kumar Sanghvi <kumar.sanghvi@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/phonet.h

@@ -36,6 +36,11 @@
 /* Socket options for SOL_PNPIPE level */
 #define PNPIPE_ENCAP		1
 #define PNPIPE_IFINDEX		2
+#define PNPIPE_CREATE           3
+#define PNPIPE_ENABLE           4
+#define PNPIPE_DISABLE          5
+#define PNPIPE_DESTROY          6
+#define PNPIPE_INQ              7
 
 #define PNADDR_ANY		0
 #define PNADDR_BROADCAST	0xFC

include/net/phonet/pep.h

@@ -45,6 +45,10 @@ struct pep_sock {
 	u8			tx_fc;	/* TX flow control */
 	u8			init_enable;	/* auto-enable at creation */
 	u8			aligned;
+#ifdef CONFIG_PHONET_PIPECTRLR
+	u16                     remote_pep;
+	u8                      pipe_state;
+#endif
 };
 
 static inline struct pep_sock *pep_sk(struct sock *sk)
@@ -165,4 +169,21 @@ enum {
 	PEP_IND_READY,
 };
 
+#ifdef CONFIG_PHONET_PIPECTRLR
+#define PNS_PEP_CONNECT_UTID           0x02
+#define PNS_PIPE_CREATED_IND_UTID      0x04
+#define PNS_PIPE_ENABLE_UTID           0x0A
+#define PNS_PIPE_ENABLED_IND_UTID      0x0C
+#define PNS_PIPE_DISABLE_UTID          0x0F
+#define PNS_PIPE_DISABLED_IND_UTID     0x11
+#define PNS_PEP_DISCONNECT_UTID        0x06
+
+/* Used for tracking state of a pipe */
+enum {
+	PIPE_IDLE,
+	PIPE_DISABLED,
+	PIPE_ENABLED,
+};
+#endif /* CONFIG_PHONET_PIPECTRLR */
+
 #endif

net/phonet/Kconfig

@@ -14,3 +14,14 @@ config PHONET
 
 	  To compile this driver as a module, choose M here: the module
 	  will be called phonet. If unsure, say N.
+
+config PHONET_PIPECTRLR
+	bool "Phonet Pipe Controller"
+	depends on PHONET
+	default N
+	help
+	  The Pipe Controller implementation in Phonet stack to support Pipe
+	  data with Nokia Slim modems like WG2.5 used on ST-Ericsson U8500
+	  platform.
+
+	  If unsure, say N.