diff options
| -rw-r--r-- | MAINTAINERS | 7 | ||||
| -rw-r--r-- | drivers/net/wwan/Kconfig | 18 | ||||
| -rw-r--r-- | drivers/net/wwan/Makefile | 1 | ||||
| -rw-r--r-- | drivers/net/wwan/rpmsg_wwan_ctrl.c | 143 |
4 files changed, 169 insertions, 0 deletions
diff --git a/MAINTAINERS b/MAINTAINERS index 183cc61e2dc0..fbf792962d7b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -15587,6 +15587,13 @@ F: include/linux/rpmsg/ F: include/uapi/linux/rpmsg.h F: samples/rpmsg/ +REMOTE PROCESSOR MESSAGING (RPMSG) WWAN CONTROL DRIVER +M: Stephan Gerhold <stephan@gerhold.net> +L: netdev@vger.kernel.org +L: linux-remoteproc@vger.kernel.org +S: Maintained +F: drivers/net/wwan/rpmsg_wwan_ctrl.c + RENESAS CLOCK DRIVERS M: Geert Uytterhoeven <geert+renesas@glider.be> L: linux-renesas-soc@vger.kernel.org diff --git a/drivers/net/wwan/Kconfig b/drivers/net/wwan/Kconfig index 249b3f1ed62b..de9384326bc8 100644 --- a/drivers/net/wwan/Kconfig +++ b/drivers/net/wwan/Kconfig @@ -38,6 +38,24 @@ config MHI_WWAN_CTRL To compile this driver as a module, choose M here: the module will be called mhi_wwan_ctrl. +config RPMSG_WWAN_CTRL + tristate "RPMSG WWAN control driver" + depends on RPMSG + help + RPMSG WWAN CTRL allows modems available via RPMSG channels to expose + different modem protocols/ports to userspace, including AT and QMI. + These protocols can be accessed directly from userspace + (e.g. AT commands) or via libraries/tools (e.g. libqmi, libqcdm...). + + This is mainly used for modems integrated into many Qualcomm SoCs, + e.g. for AT and QMI on Qualcomm MSM8916 or MSM8974. Note that many + newer Qualcomm SoCs (e.g. SDM845) still provide an AT port through + this driver but the QMI messages can only be sent through + QRTR network sockets (CONFIG_QRTR). + + To compile this driver as a module, choose M here: the module will be + called rpmsg_wwan_ctrl. + config IOSM tristate "IOSM Driver for Intel M.2 WWAN Device" depends on INTEL_IOMMU diff --git a/drivers/net/wwan/Makefile b/drivers/net/wwan/Makefile index 83dd3482ffc3..d90ac33abaef 100644 --- a/drivers/net/wwan/Makefile +++ b/drivers/net/wwan/Makefile @@ -9,4 +9,5 @@ wwan-objs += wwan_core.o obj-$(CONFIG_WWAN_HWSIM) += wwan_hwsim.o obj-$(CONFIG_MHI_WWAN_CTRL) += mhi_wwan_ctrl.o +obj-$(CONFIG_RPMSG_WWAN_CTRL) += rpmsg_wwan_ctrl.o obj-$(CONFIG_IOSM) += iosm/ 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>"); |