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// 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 int rpmsg_wwan_ctrl_tx_blocking(struct wwan_port *port, struct sk_buff *skb)
{
struct rpmsg_wwan_dev *rpwwan = wwan_port_get_drvdata(port);
int ret;
ret = rpmsg_send(rpwwan->ept, skb->data, skb->len);
if (ret)
return ret;
consume_skb(skb);
return 0;
}
static __poll_t rpmsg_wwan_ctrl_tx_poll(struct wwan_port *port,
struct file *filp, poll_table *wait)
{
struct rpmsg_wwan_dev *rpwwan = wwan_port_get_drvdata(port);
return rpmsg_poll(rpwwan->ept, filp, wait);
}
static const struct wwan_port_ops rpmsg_wwan_pops = {
.start = rpmsg_wwan_ctrl_start,
.stop = rpmsg_wwan_ctrl_stop,
.tx = rpmsg_wwan_ctrl_tx,
.tx_blocking = rpmsg_wwan_ctrl_tx_blocking,
.tx_poll = rpmsg_wwan_ctrl_tx_poll,
};
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>");
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