linux-kernel - [PATCH net-next] net: wwan: iosm: add rpc interface for xmm modems

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Message-Id: <20221028003128.514318-1-shaneparslow808@gmail.com>
Date:   Thu, 27 Oct 2022 17:31:29 -0700
From:   Shane Parslow <shaneparslow808@...il.com>
To:     m.chetan.kumar@...el.com, linuxwwan@...el.com
Cc:     shaneparslow808@...il.com, Loic Poulain <loic.poulain@...aro.org>,
        Sergey Ryazanov <ryazanov.s.a@...il.com>,
        Johannes Berg <johannes@...solutions.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next] 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@...il.com>
---
 drivers/net/wwan/iosm/iosm_ipc_chnl_cfg.c | 2 +-
 drivers/net/wwan/wwan_core.c              | 4 ++++
 include/linux/wwan.h                      | 2 ++
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wwan/iosm/iosm_ipc_chnl_cfg.c b/drivers/net/wwan/iosm/iosm_ipc_chnl_cfg.c
index 128c999e08bb..91e3e83fc47b 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_chnl_cfg.c
+++ b/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_RPC },
 	/* 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,
diff --git a/drivers/net/wwan/wwan_core.c b/drivers/net/wwan/wwan_core.c
index 62e9f7d6c9fe..cf16a2704914 100644
--- a/drivers/net/wwan/wwan_core.c
+++ b/drivers/net/wwan/wwan_core.c
@@ -319,6 +319,10 @@ static const struct {
 		.name = "FIREHOSE",
 		.devsuf = "firehose",
 	},
+	[WWAN_PORT_RPC] = {
+		.name = "RPC",
+		.devsuf = "rpc",
+	},
 };
 
 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
diff --git a/include/linux/wwan.h b/include/linux/wwan.h
index 5ce2acf444fb..3cf2182ad4e9 100644
--- a/include/linux/wwan.h
+++ b/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_RPC: 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_RPC,
 
 	/* Add new port types above this line */
 
-- 
2.38.1