net: wwan: iosm: add rpc interface for xmm modems

Add a new iosm wwan port that connects to the modem rpc interface. This
interface provides a configuration channel, and in the case of the 7360, is
the only way to configure the modem (as it does not support mbim).

The new interface is compatible with existing software, such as
open_xdatachannel.py from the xmm7360-pci project [1].

[1] https://github.com/xmm7360/xmm7360-pci

Signed-off-by: Shane Parslow <shaneparslow808@gmail.com>
Reviewed-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wwan/iosm/iosm_ipc_chnl_cfg.c

@@ -39,7 +39,7 @@ static struct ipc_chnl_cfg modem_cfg[] = {
 	/* RPC - 0 */
 	{ IPC_MEM_CTRL_CHL_ID_1, IPC_MEM_PIPE_2, IPC_MEM_PIPE_3,
 	  IPC_MEM_MAX_TDS_RPC, IPC_MEM_MAX_TDS_RPC,
-	  IPC_MEM_MAX_DL_RPC_BUF_SIZE, WWAN_PORT_UNKNOWN },
+	  IPC_MEM_MAX_DL_RPC_BUF_SIZE, WWAN_PORT_XMMRPC },
 	/* IAT0 */
 	{ IPC_MEM_CTRL_CHL_ID_2, IPC_MEM_PIPE_4, IPC_MEM_PIPE_5,
 	  IPC_MEM_MAX_TDS_AT, IPC_MEM_MAX_TDS_AT, IPC_MEM_MAX_DL_AT_BUF_SIZE,

drivers/net/wwan/wwan_core.c

@@ -319,6 +319,10 @@ static const struct {
 		.name = "FIREHOSE",
 		.devsuf = "firehose",
 	},
+	[WWAN_PORT_XMMRPC] = {
+		.name = "XMMRPC",
+		.devsuf = "xmmrpc",
+	},
 };
 
 static ssize_t type_show(struct device *dev, struct device_attribute *attr,

include/linux/wwan.h

@@ -15,6 +15,7 @@
  * @WWAN_PORT_QMI: Qcom modem/MSM interface for modem control
  * @WWAN_PORT_QCDM: Qcom Modem diagnostic interface
  * @WWAN_PORT_FIREHOSE: XML based command protocol
+ * @WWAN_PORT_XMMRPC: Control protocol for Intel XMM modems
  *
  * @WWAN_PORT_MAX: Highest supported port types
  * @WWAN_PORT_UNKNOWN: Special value to indicate an unknown port type
@@ -26,6 +27,7 @@ enum wwan_port_type {
 	WWAN_PORT_QMI,
 	WWAN_PORT_QCDM,
 	WWAN_PORT_FIREHOSE,
+	WWAN_PORT_XMMRPC,
 
 	/* Add new port types above this line */