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| 2 | |
| 3 | * Remote processor messaging - sample client driver
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| 4 | *
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| 5 | * Copyright (C) 2011 Texas Instruments, Inc.
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| 6 | * Copyright (C) 2011 Google, Inc.
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| 7 | *
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| 8 | * Ohad Ben-Cohen <[email protected]>
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| 9 | * Brian Swetland <[email protected]>
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| 10 |
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| 11 |
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| 12 | #include <linux/kernel.h>
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| 13 | #include <linux/module.h>
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| 14 | #include <linux/rpmsg.h>
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| 15 |
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| 16 | #define MSG "hello world!"
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| 17 |
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| 18 | static int count = 100;
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| 19 | module_param(count, int, 0644);
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| 20 |
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| 21 | struct instance_data {
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| 22 | int rx_count;
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| 23 | };
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| 24 |
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| 25 | static int rpmsg_sample_cb(struct rpmsg_device *rpdev, void *data, int len,
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| 26 | void *priv, u32 src)
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| 27 | {
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| 28 | int ret;
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| 29 | struct instance_data *idata = dev_get_drvdata(&rpdev->dev);
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| 30 |
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| 31 | dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n",
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| 32 | ++idata->rx_count, src);
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| 33 |
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| 34 | print_hex_dump_debug(__func__, DUMP_PREFIX_NONE, 16, 1, data, len,
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| 35 | true);
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| 36 |
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| 37 |
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| 38 | if (idata->rx_count >= count) {
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| 39 | dev_info(&rpdev->dev, "goodbye!\n");
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| 40 | return 0;
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| 41 | }
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| 42 |
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| 43 |
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| 44 | ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
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| 45 | if (ret)
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| 46 | dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
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| 47 |
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| 48 | return 0;
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| 49 | }
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| 50 |
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| 51 | static int rpmsg_sample_probe(struct rpmsg_device *rpdev)
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| 52 | {
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| 53 | int ret;
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| 54 | struct instance_data *idata;
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| 55 |
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| 56 | dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
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| 57 | rpdev->src, rpdev->dst);
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| 58 |
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| 59 | idata = devm_kzalloc(&rpdev->dev, sizeof(*idata), GFP_KERNEL);
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| 60 | if (!idata)
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| 61 | return -ENOMEM;
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| 62 |
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| 63 | dev_set_drvdata(&rpdev->dev, idata);
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| 64 |
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| 65 |
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| 66 | ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
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| 67 | if (ret) {
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| 68 | dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
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| 69 | return ret;
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| 70 | }
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| 71 |
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| 72 | return 0;
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| 73 | }
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| 74 |
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| 75 | static void rpmsg_sample_remove(struct rpmsg_device *rpdev)
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| 76 | {
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| 77 | dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n");
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| 78 | }
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| 79 |
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| 80 | static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = {
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| 81 | { .name = "rpmsg-client-sample" },
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| 82 | { },
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| 83 | };
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| 84 | MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_sample_id_table);
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| 85 |
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| 86 | static struct rpmsg_driver rpmsg_sample_client = {
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| 87 | .drv.name = KBUILD_MODNAME,
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| 88 | .id_table = rpmsg_driver_sample_id_table,
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| 89 | .probe = rpmsg_sample_probe,
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| 90 | .callback = rpmsg_sample_cb,
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| 91 | .remove = rpmsg_sample_remove,
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| 92 | };
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| 93 | module_rpmsg_driver(rpmsg_sample_client);
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| 94 |
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| 95 | MODULE_DESCRIPTION("Remote processor messaging sample client driver");
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| 96 | MODULE_LICENSE("GPL v2");
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