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4b83c52a21
Some rpmsg backends support holding on to and redelivering messages upon failed handling of them, so provide a way for the callback to report and error and allow the backends to handle this. Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
/*
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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 <ohad@wizery.com>
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* Brian Swetland <swetland@google.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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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#define MSG_LIMIT 100
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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(KERN_DEBUG, __func__, DUMP_PREFIX_NONE, 16, 1,
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data, len, true);
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/* samples should not live forever */
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if (idata->rx_count >= MSG_LIMIT) {
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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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