drivers/soc/qcom/rpm-proc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Copyright (c) 2021-2023, Stephan Gerhold <[email protected]> */
   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
  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
  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 = rpm_proc_remove,
  57         .driver = {
  58                 .name = "qcom-rpm-proc",
  59                 .of_match_table = rpm_proc_of_match,
  60         },
  61 };
  62
  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
  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 <[email protected]>");
  77 MODULE_LICENSE("GPL");