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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 | // 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, }; strscpy(chinfo.name, rpwwan->rpdev->id.name, sizeof(chinfo.name)); 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, NULL, 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 }, { .name = "DATA1", .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>"); |