Files
ModemManager/plugins/qcom-soc/mm-broadband-modem-qmi-qcom-soc.c
Stephan Gerhold 681d5d29d5 qcom-soc: Add support for WWAN subsystem instead of RPMSG
Recent Linux kernel versions have introduced a generic WWAN subsystem
that provides various char devices for QMI, AT etc, similar to the
subsystem-specific char devices for USB or RPMSG.

The RPMSG char device for Qualcomm SoCs (e.g. MSM8916/MSM8974)
are particularly complicated to work with because they need to be
explicitly created from userspace with rpmsgexport and don't show up
automatically.

However, it turns out it's fairly simple to wrap the RPMSG subsystem
in a simple driver for the WWAN subsystem. This has several advantages:

  - We can drop support for the special RPMSG char devices entirely
    at some point.
  - The WWAN char devices show up automatically, without having to export
    them explicitly, making ModemManager work out of the box on these devices.

For now, just support using the WWAN subsystem alternatively for the
qcom-soc plugin. Later we can consider dropping the old RPMSG code.
2021-07-08 13:41:47 +00:00

182 lines
6.5 KiB
C

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details:
*
* Copyright (C) 2020 Aleksander Morgado <aleksander@aleksander.es>
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include "ModemManager.h"
#include "mm-log.h"
#include "mm-iface-modem.h"
#include "mm-broadband-modem-qmi-qcom-soc.h"
G_DEFINE_TYPE (MMBroadbandModemQmiQcomSoc, mm_broadband_modem_qmi_qcom_soc, MM_TYPE_BROADBAND_MODEM_QMI)
/*****************************************************************************/
static const QmiSioPort sio_port_per_port_number[] = {
QMI_SIO_PORT_A2_MUX_RMNET0,
QMI_SIO_PORT_A2_MUX_RMNET1,
QMI_SIO_PORT_A2_MUX_RMNET2,
QMI_SIO_PORT_A2_MUX_RMNET3,
QMI_SIO_PORT_A2_MUX_RMNET4,
QMI_SIO_PORT_A2_MUX_RMNET5,
QMI_SIO_PORT_A2_MUX_RMNET6,
QMI_SIO_PORT_A2_MUX_RMNET7
};
static MMPortQmi *
peek_port_qmi_for_data_bam_dmux (MMBroadbandModemQmi *self,
MMPort *data,
QmiSioPort *out_sio_port,
GError **error)
{
GList *rpmsg_qmi_ports;
MMPortQmi *found = NULL;
MMKernelDevice *net_port;
gint net_port_number;
net_port = mm_port_peek_kernel_device (data);
/* The dev_port notified by the bam-dmux driver indicates which SIO port we should be using */
net_port_number = mm_kernel_device_get_attribute_as_int (net_port, "dev_port");
if (net_port_number < 0 || net_port_number >= (gint) G_N_ELEMENTS (sio_port_per_port_number)) {
g_set_error (error,
MM_CORE_ERROR,
MM_CORE_ERROR_NOT_FOUND,
"Couldn't find SIO port number for 'net/%s'",
mm_port_get_device (data));
return NULL;
}
/* Find one QMI port, we don't care which one */
rpmsg_qmi_ports = mm_base_modem_find_ports (MM_BASE_MODEM (self),
MM_PORT_SUBSYS_UNKNOWN,
MM_PORT_TYPE_QMI);
if (!rpmsg_qmi_ports) {
g_set_error (error,
MM_CORE_ERROR,
MM_CORE_ERROR_NOT_FOUND,
"Couldn't find any QMI port for 'net/%s'",
mm_port_get_device (data));
return NULL;
}
/* Set outputs */
if (out_sio_port)
*out_sio_port = sio_port_per_port_number[net_port_number];
found = MM_PORT_QMI (rpmsg_qmi_ports->data);
g_list_free_full (rpmsg_qmi_ports, g_object_unref);
return found;
}
static MMPortQmi *
peek_port_qmi_for_data_ipa (MMBroadbandModemQmi *self,
MMPort *data,
QmiSioPort *out_sio_port,
GError **error)
{
MMPortQmi *found = NULL;
/* when using IPA, we have a master network interface that will be multiplexed
* to create link interfaces. We can assume any of the available QMI ports is
* able to manage that. */
found = mm_broadband_modem_qmi_peek_port_qmi (self);
if (!found)
g_set_error (error,
MM_CORE_ERROR,
MM_CORE_ERROR_NOT_FOUND,
"Couldn't find any QMI port for 'net/%s'",
mm_port_get_device (data));
else if (out_sio_port)
*out_sio_port = QMI_SIO_PORT_NONE;
return found;
}
static MMPortQmi *
peek_port_qmi_for_data (MMBroadbandModemQmi *self,
MMPort *data,
QmiSioPort *out_sio_port,
GError **error)
{
MMKernelDevice *net_port;
const gchar *net_port_driver;
g_assert (MM_IS_BROADBAND_MODEM_QMI (self));
g_assert (mm_port_get_subsys (data) == MM_PORT_SUBSYS_NET);
net_port = mm_port_peek_kernel_device (data);
net_port_driver = mm_kernel_device_get_driver (net_port);
if (g_strcmp0 (net_port_driver, "ipa") == 0)
return peek_port_qmi_for_data_ipa (self, data, out_sio_port, error);
if (g_strcmp0 (net_port_driver, "bam-dmux") == 0)
return peek_port_qmi_for_data_bam_dmux (self, data, out_sio_port, error);
g_set_error (error,
MM_CORE_ERROR,
MM_CORE_ERROR_FAILED,
"Unsupported QMI kernel driver for 'net/%s': %s",
mm_port_get_device (data),
net_port_driver);
return NULL;
}
/*****************************************************************************/
MMBroadbandModemQmiQcomSoc *
mm_broadband_modem_qmi_qcom_soc_new (const gchar *device,
const gchar **drivers,
const gchar *plugin,
guint16 vendor_id,
guint16 product_id)
{
return g_object_new (MM_TYPE_BROADBAND_MODEM_QMI_QCOM_SOC,
MM_BASE_MODEM_DEVICE, device,
MM_BASE_MODEM_DRIVERS, drivers,
MM_BASE_MODEM_PLUGIN, plugin,
MM_BASE_MODEM_VENDOR_ID, vendor_id,
MM_BASE_MODEM_PRODUCT_ID, product_id,
/* QMI bearer supports NET only */
MM_BASE_MODEM_DATA_NET_SUPPORTED, TRUE,
MM_BASE_MODEM_DATA_TTY_SUPPORTED, FALSE,
MM_IFACE_MODEM_SIM_HOT_SWAP_SUPPORTED, TRUE,
MM_IFACE_MODEM_SIM_HOT_SWAP_CONFIGURED, FALSE,
NULL);
}
static void
mm_broadband_modem_qmi_qcom_soc_init (MMBroadbandModemQmiQcomSoc *self)
{
}
static void
mm_broadband_modem_qmi_qcom_soc_class_init (MMBroadbandModemQmiQcomSocClass *klass)
{
MMBroadbandModemQmiClass *broadband_modem_qmi_class = MM_BROADBAND_MODEM_QMI_CLASS (klass);
broadband_modem_qmi_class->peek_port_qmi_for_data = peek_port_qmi_for_data;
}