summaryrefslogtreecommitdiff
path: root/drivers/net/wwan/rpmsg_wwan_ctrl.c
diff options
context:
space:
mode:
authorStephan Gerhold <stephan@gerhold.net>2021-06-18 20:36:10 +0300
committerDavid S. Miller <davem@davemloft.net>2021-06-18 23:13:40 +0300
commit5e90abf49c2adfbd6954429c2a1aafdfe9fcab92 (patch)
tree8c613f36d1569678cbb0ffa2ca2391ebc9274144 /drivers/net/wwan/rpmsg_wwan_ctrl.c
parent60302ce4ea075369641426ef407c110e36ea8ba1 (diff)
downloadlinux-5e90abf49c2adfbd6954429c2a1aafdfe9fcab92.tar.xz
net: wwan: Add RPMSG WWAN CTRL driver
The remote processor messaging (rpmsg) subsystem provides an interface to communicate with other remote processors. On many Qualcomm SoCs this is used to communicate with an integrated modem DSP that implements most of the modem functionality and provides high-level protocols like QMI or AT to allow controlling the modem. For QMI, most older Qualcomm SoCs (e.g. MSM8916/MSM8974) have a standalone "DATA5_CNTL" channel that allows exchanging QMI messages. Note that newer SoCs (e.g. SDM845) only allow exchanging QMI messages via a shared QRTR channel that is available via a socket API on Linux. For AT, the "DATA4" channel accepts at least a limited set of AT commands, on many older and newer Qualcomm SoCs, although QMI is typically the preferred control protocol. Often there are additional QMI/AT channels (usually named DATA*_CNTL for QMI and DATA* for AT), but it is not clear if those are really functional on all devices. Also, at the moment there is no use case for having multiple QMI/AT ports. If needed more channels could be added later after more testing. Note that the data path (network interface) is entirely separate from the control path and varies between Qualcomm SoCs, e.g. "IPA" on newer Qualcomm SoCs or "BAM-DMUX" on some older ones. The RPMSG WWAN CTRL driver exposes the QMI/AT control ports via the WWAN subsystem, and therefore allows userspace like ModemManager to set up the modem. Until now, ModemManager had to use the RPMSG-specific rpmsg-char where the channels must be explicitly exposed as a char device first and don't show up directly in sysfs. The driver is a fairly simple glue layer between WWAN and RPMSG and is mostly based on the existing mhi_wwan_ctrl.c and rpmsg_char.c. Cc: Loic Poulain <loic.poulain@linaro.org> Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/wwan/rpmsg_wwan_ctrl.c')
-rw-r--r--drivers/net/wwan/rpmsg_wwan_ctrl.c143
1 files changed, 143 insertions, 0 deletions
diff --git a/drivers/net/wwan/rpmsg_wwan_ctrl.c b/drivers/net/wwan/rpmsg_wwan_ctrl.c
new file mode 100644
index 000000000000..de226cdb69fd
--- /dev/null
+++ b/drivers/net/wwan/rpmsg_wwan_ctrl.c
@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2021, Stephan Gerhold <stephan@gerhold.net> */
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/rpmsg.h>
+#include <linux/wwan.h>
+
+struct rpmsg_wwan_dev {
+ /* Lower level is a rpmsg dev, upper level is a wwan port */
+ struct rpmsg_device *rpdev;
+ struct wwan_port *wwan_port;
+ struct rpmsg_endpoint *ept;
+};
+
+static int rpmsg_wwan_ctrl_callback(struct rpmsg_device *rpdev,
+ void *buf, int len, void *priv, u32 src)
+{
+ struct rpmsg_wwan_dev *rpwwan = priv;
+ struct sk_buff *skb;
+
+ skb = alloc_skb(len, GFP_ATOMIC);
+ if (!skb)
+ return -ENOMEM;
+
+ skb_put_data(skb, buf, len);
+ wwan_port_rx(rpwwan->wwan_port, skb);
+ return 0;
+}
+
+static int rpmsg_wwan_ctrl_start(struct wwan_port *port)
+{
+ struct rpmsg_wwan_dev *rpwwan = wwan_port_get_drvdata(port);
+ struct rpmsg_channel_info chinfo = {
+ .src = rpwwan->rpdev->src,
+ .dst = RPMSG_ADDR_ANY,
+ };
+
+ strncpy(chinfo.name, rpwwan->rpdev->id.name, RPMSG_NAME_SIZE);
+ rpwwan->ept = rpmsg_create_ept(rpwwan->rpdev, rpmsg_wwan_ctrl_callback,
+ rpwwan, chinfo);
+ if (!rpwwan->ept)
+ return -EREMOTEIO;
+
+ return 0;
+}
+
+static void rpmsg_wwan_ctrl_stop(struct wwan_port *port)
+{
+ struct rpmsg_wwan_dev *rpwwan = wwan_port_get_drvdata(port);
+
+ rpmsg_destroy_ept(rpwwan->ept);
+ rpwwan->ept = NULL;
+}
+
+static int rpmsg_wwan_ctrl_tx(struct wwan_port *port, struct sk_buff *skb)
+{
+ struct rpmsg_wwan_dev *rpwwan = wwan_port_get_drvdata(port);
+ int ret;
+
+ ret = rpmsg_trysend(rpwwan->ept, skb->data, skb->len);
+ if (ret)
+ return ret;
+
+ consume_skb(skb);
+ return 0;
+}
+
+static const struct wwan_port_ops rpmsg_wwan_pops = {
+ .start = rpmsg_wwan_ctrl_start,
+ .stop = rpmsg_wwan_ctrl_stop,
+ .tx = rpmsg_wwan_ctrl_tx,
+};
+
+static struct device *rpmsg_wwan_find_parent(struct device *dev)
+{
+ /* Select first platform device as parent for the WWAN ports.
+ * On Qualcomm platforms this is usually the platform device that
+ * represents the modem remote processor. This might need to be
+ * adjusted when adding device IDs for other platforms.
+ */
+ for (dev = dev->parent; dev; dev = dev->parent) {
+ if (dev_is_platform(dev))
+ return dev;
+ }
+ return NULL;
+}
+
+static int rpmsg_wwan_ctrl_probe(struct rpmsg_device *rpdev)
+{
+ struct rpmsg_wwan_dev *rpwwan;
+ struct wwan_port *port;
+ struct device *parent;
+
+ parent = rpmsg_wwan_find_parent(&rpdev->dev);
+ if (!parent)
+ return -ENODEV;
+
+ rpwwan = devm_kzalloc(&rpdev->dev, sizeof(*rpwwan), GFP_KERNEL);
+ if (!rpwwan)
+ return -ENOMEM;
+
+ rpwwan->rpdev = rpdev;
+ dev_set_drvdata(&rpdev->dev, rpwwan);
+
+ /* Register as a wwan port, id.driver_data contains wwan port type */
+ port = wwan_create_port(parent, rpdev->id.driver_data,
+ &rpmsg_wwan_pops, rpwwan);
+ if (IS_ERR(port))
+ return PTR_ERR(port);
+
+ rpwwan->wwan_port = port;
+
+ return 0;
+};
+
+static void rpmsg_wwan_ctrl_remove(struct rpmsg_device *rpdev)
+{
+ struct rpmsg_wwan_dev *rpwwan = dev_get_drvdata(&rpdev->dev);
+
+ wwan_remove_port(rpwwan->wwan_port);
+}
+
+static const struct rpmsg_device_id rpmsg_wwan_ctrl_id_table[] = {
+ /* RPMSG channels for Qualcomm SoCs with integrated modem */
+ { .name = "DATA5_CNTL", .driver_data = WWAN_PORT_QMI },
+ { .name = "DATA4", .driver_data = WWAN_PORT_AT },
+ {},
+};
+MODULE_DEVICE_TABLE(rpmsg, rpmsg_wwan_ctrl_id_table);
+
+static struct rpmsg_driver rpmsg_wwan_ctrl_driver = {
+ .drv.name = "rpmsg_wwan_ctrl",
+ .id_table = rpmsg_wwan_ctrl_id_table,
+ .probe = rpmsg_wwan_ctrl_probe,
+ .remove = rpmsg_wwan_ctrl_remove,
+};
+module_rpmsg_driver(rpmsg_wwan_ctrl_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("RPMSG WWAN CTRL Driver");
+MODULE_AUTHOR("Stephan Gerhold <stephan@gerhold.net>");