cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dummy.c (2060B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * dummy.c
      4 *
      5 * Copyright 2010 Wolfson Microelectronics PLC.
      6 *
      7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
      8 *
      9 * This is useful for systems with mixed controllable and
     10 * non-controllable regulators, as well as for allowing testing on
     11 * systems with no controllable regulators.
     12 */
     13
     14#include <linux/err.h>
     15#include <linux/export.h>
     16#include <linux/platform_device.h>
     17#include <linux/regulator/driver.h>
     18#include <linux/regulator/machine.h>
     19
     20#include "dummy.h"
     21
     22struct regulator_dev *dummy_regulator_rdev;
     23
     24static const struct regulator_init_data dummy_initdata = {
     25	.constraints = {
     26		.always_on = 1,
     27	},
     28};
     29
     30static const struct regulator_ops dummy_ops;
     31
     32static const struct regulator_desc dummy_desc = {
     33	.name = "regulator-dummy",
     34	.id = -1,
     35	.type = REGULATOR_VOLTAGE,
     36	.owner = THIS_MODULE,
     37	.ops = &dummy_ops,
     38};
     39
     40static int dummy_regulator_probe(struct platform_device *pdev)
     41{
     42	struct regulator_config config = { };
     43	int ret;
     44
     45	config.dev = &pdev->dev;
     46	config.init_data = &dummy_initdata;
     47
     48	dummy_regulator_rdev = devm_regulator_register(&pdev->dev, &dummy_desc,
     49						       &config);
     50	if (IS_ERR(dummy_regulator_rdev)) {
     51		ret = PTR_ERR(dummy_regulator_rdev);
     52		pr_err("Failed to register regulator: %d\n", ret);
     53		return ret;
     54	}
     55
     56	return 0;
     57}
     58
     59static struct platform_driver dummy_regulator_driver = {
     60	.probe		= dummy_regulator_probe,
     61	.driver		= {
     62		.name		= "reg-dummy",
     63	},
     64};
     65
     66static struct platform_device *dummy_pdev;
     67
     68void __init regulator_dummy_init(void)
     69{
     70	int ret;
     71
     72	dummy_pdev = platform_device_alloc("reg-dummy", -1);
     73	if (!dummy_pdev) {
     74		pr_err("Failed to allocate dummy regulator device\n");
     75		return;
     76	}
     77
     78	ret = platform_device_add(dummy_pdev);
     79	if (ret != 0) {
     80		pr_err("Failed to register dummy regulator device: %d\n", ret);
     81		platform_device_put(dummy_pdev);
     82		return;
     83	}
     84
     85	ret = platform_driver_register(&dummy_regulator_driver);
     86	if (ret != 0) {
     87		pr_err("Failed to register dummy regulator driver: %d\n", ret);
     88		platform_device_unregister(dummy_pdev);
     89	}
     90}