1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2021-2023, Stephan Gerhold <stephan@gerhold.net> */
3
4 #include <linux/module.h>
5 #include <linux/of.h>
6 #include <linux/of_platform.h>
7 #include <linux/platform_device.h>
8 #include <linux/rpmsg/qcom_smd.h>
9
rpm_proc_probe(struct platform_device * pdev)10 static int rpm_proc_probe(struct platform_device *pdev)
11 {
12 struct qcom_smd_edge *edge = NULL;
13 struct device *dev = &pdev->dev;
14 struct device_node *edge_node;
15 int ret;
16
17 edge_node = of_get_child_by_name(dev->of_node, "smd-edge");
18 if (edge_node) {
19 edge = qcom_smd_register_edge(dev, edge_node);
20 of_node_put(edge_node);
21 if (IS_ERR(edge))
22 return dev_err_probe(dev, PTR_ERR(edge),
23 "Failed to register smd-edge\n");
24 }
25
26 ret = devm_of_platform_populate(dev);
27 if (ret) {
28 dev_err(dev, "Failed to populate child devices: %d\n", ret);
29 goto err;
30 }
31
32 platform_set_drvdata(pdev, edge);
33 return 0;
34 err:
35 if (edge)
36 qcom_smd_unregister_edge(edge);
37 return ret;
38 }
39
rpm_proc_remove(struct platform_device * pdev)40 static void rpm_proc_remove(struct platform_device *pdev)
41 {
42 struct qcom_smd_edge *edge = platform_get_drvdata(pdev);
43
44 if (edge)
45 qcom_smd_unregister_edge(edge);
46 }
47
48 static const struct of_device_id rpm_proc_of_match[] = {
49 { .compatible = "qcom,rpm-proc", },
50 { /* sentinel */ }
51 };
52 MODULE_DEVICE_TABLE(of, rpm_proc_of_match);
53
54 static struct platform_driver rpm_proc_driver = {
55 .probe = rpm_proc_probe,
56 .remove_new = rpm_proc_remove,
57 .driver = {
58 .name = "qcom-rpm-proc",
59 .of_match_table = rpm_proc_of_match,
60 },
61 };
62
rpm_proc_init(void)63 static int __init rpm_proc_init(void)
64 {
65 return platform_driver_register(&rpm_proc_driver);
66 }
67 arch_initcall(rpm_proc_init);
68
rpm_proc_exit(void)69 static void __exit rpm_proc_exit(void)
70 {
71 platform_driver_unregister(&rpm_proc_driver);
72 }
73 module_exit(rpm_proc_exit);
74
75 MODULE_DESCRIPTION("Qualcomm RPM processor/subsystem driver");
76 MODULE_AUTHOR("Stephan Gerhold <stephan@gerhold.net>");
77 MODULE_LICENSE("GPL");
78