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96 lines
2.2 KiB
96 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Remote processor messaging - sample client driver |
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* |
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* Copyright (C) 2011 Texas Instruments, Inc. |
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* Copyright (C) 2011 Google, Inc. |
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* |
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* Ohad Ben-Cohen <[email protected]> |
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* Brian Swetland <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/rpmsg.h> |
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#define MSG "hello world!" |
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static int count = 100; |
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module_param(count, int, 0644); |
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struct instance_data { |
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int rx_count; |
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}; |
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static int rpmsg_sample_cb(struct rpmsg_device *rpdev, void *data, int len, |
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void *priv, u32 src) |
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{ |
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int ret; |
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struct instance_data *idata = dev_get_drvdata(&rpdev->dev); |
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dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n", |
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++idata->rx_count, src); |
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print_hex_dump_debug(__func__, DUMP_PREFIX_NONE, 16, 1, data, len, |
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true); |
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/* samples should not live forever */ |
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if (idata->rx_count >= count) { |
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dev_info(&rpdev->dev, "goodbye!\n"); |
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return 0; |
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} |
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/* send a new message now */ |
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ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG)); |
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if (ret) |
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dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret); |
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return 0; |
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} |
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static int rpmsg_sample_probe(struct rpmsg_device *rpdev) |
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{ |
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int ret; |
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struct instance_data *idata; |
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dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n", |
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rpdev->src, rpdev->dst); |
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idata = devm_kzalloc(&rpdev->dev, sizeof(*idata), GFP_KERNEL); |
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if (!idata) |
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return -ENOMEM; |
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dev_set_drvdata(&rpdev->dev, idata); |
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/* send a message to our remote processor */ |
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ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG)); |
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if (ret) { |
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dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret); |
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return ret; |
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} |
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return 0; |
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} |
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static void rpmsg_sample_remove(struct rpmsg_device *rpdev) |
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{ |
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dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n"); |
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} |
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static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = { |
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{ .name = "rpmsg-client-sample" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_sample_id_table); |
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static struct rpmsg_driver rpmsg_sample_client = { |
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.drv.name = KBUILD_MODNAME, |
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.id_table = rpmsg_driver_sample_id_table, |
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.probe = rpmsg_sample_probe, |
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.callback = rpmsg_sample_cb, |
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.remove = rpmsg_sample_remove, |
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}; |
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module_rpmsg_driver(rpmsg_sample_client); |
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MODULE_DESCRIPTION("Remote processor messaging sample client driver"); |
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MODULE_LICENSE("GPL v2");
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