113 lines
2.7 KiB
C
Executable File
113 lines
2.7 KiB
C
Executable File
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2021, The Linux Foundation. All rights reserved.
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* Copyright (c) 2022-2024, Qualcomm Innovation Center, Inc. All rights reserved.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include "slatecom_rpmsg.h"
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static struct slatecom_rpmsg_dev *pdev;
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struct ctrl_channel_ops ctrl_ops;
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void slatecom_ctrl_channel_init(void (*fn1)(bool), void (*fn2)(void *data, int len))
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{
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ctrl_ops.glink_channel_state = fn1;
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ctrl_ops.rx_msg = fn2;
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}
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EXPORT_SYMBOL_GPL(slatecom_ctrl_channel_init);
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int slatecom_rpmsg_tx_msg(void *msg, size_t len)
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{
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int ret = 0;
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if (pdev == NULL || !pdev->chnl_state) {
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pr_err("pmsg_device is null, channel is closed\n");
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return -ENETRESET;
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}
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pdev->message = msg;
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pdev->message_length = len;
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if (pdev->message) {
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ret = rpmsg_send(pdev->channel, pdev->message, pdev->message_length);
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if (ret)
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pr_err("rpmsg_send failed: %d\n", ret);
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(slatecom_rpmsg_tx_msg);
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static int slatecom_rpmsg_probe(struct rpmsg_device *rpdev)
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{
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int ret = 0;
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void *msg = NULL;
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pdev = devm_kzalloc(&rpdev->dev, sizeof(*pdev), GFP_KERNEL);
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if (!pdev)
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return -ENOMEM;
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pdev->channel = rpdev->ept;
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pdev->dev = &rpdev->dev;
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if (pdev->channel == NULL)
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return -ENOMEM;
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pdev->chnl_state = true;
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dev_set_drvdata(&rpdev->dev, pdev);
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/* send a callback to slatecom-interface driver*/
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ctrl_ops.glink_channel_state(true);
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if (pdev->message == NULL)
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ret = slatecom_rpmsg_tx_msg(msg, 0);
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return 0;
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}
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static void slatecom_rpmsg_remove(struct rpmsg_device *rpdev)
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{
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pdev->chnl_state = false;
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pdev->message = NULL;
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dev_dbg(&rpdev->dev, "rpmsg client driver is removed\n");
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ctrl_ops.glink_channel_state(false);
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dev_set_drvdata(&rpdev->dev, NULL);
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}
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static int slatecom_rpmsg_cb(struct rpmsg_device *rpdev,
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void *data, int len, void *priv, u32 src)
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{
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struct slatecom_rpmsg_dev *dev =
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dev_get_drvdata(&rpdev->dev);
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if (!dev)
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return -ENODEV;
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ctrl_ops.rx_msg(data, len);
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return 0;
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}
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static const struct rpmsg_device_id rpmsg_driver_slatecom_id_table[] = {
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{ "slate-ctrl" },
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{},
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};
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MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_slatecom_id_table);
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static const struct of_device_id rpmsg_driver_slatecom_of_match[] = {
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{ .compatible = "qcom,slatecom-rpmsg" },
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{},
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};
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static struct rpmsg_driver rpmsg_slatecom_client = {
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.id_table = rpmsg_driver_slatecom_id_table,
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.probe = slatecom_rpmsg_probe,
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.callback = slatecom_rpmsg_cb,
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.remove = slatecom_rpmsg_remove,
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.drv = {
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.name = "qcom,slatecom_rpmsg",
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.of_match_table = rpmsg_driver_slatecom_of_match,
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},
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};
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module_rpmsg_driver(rpmsg_slatecom_client);
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MODULE_DESCRIPTION("Interface Driver for SLATECOM and RPMSG");
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MODULE_LICENSE("GPL");
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