diff options
Diffstat (limited to 'drivers/regulator/virtual.c')
| -rw-r--r-- | drivers/regulator/virtual.c | 52 |
1 files changed, 38 insertions, 14 deletions
diff --git a/drivers/regulator/virtual.c b/drivers/regulator/virtual.c index a6f1c7a9914f..218a0d66a152 100644 --- a/drivers/regulator/virtual.c +++ b/drivers/regulator/virtual.c @@ -1,14 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * reg-virtual-consumer.c * * Copyright 2008 Wolfson Microelectronics PLC. * * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of the - * License, or (at your option) any later version. */ #include <linux/err.h> @@ -17,6 +13,7 @@ #include <linux/regulator/consumer.h> #include <linux/slab.h> #include <linux/module.h> +#include <linux/of.h> struct virtual_consumer_data { struct mutex lock; @@ -285,26 +282,53 @@ static const struct attribute_group regulator_virtual_attr_group = { .attrs = regulator_virtual_attributes, }; +#ifdef CONFIG_OF +static const struct of_device_id regulator_virtual_consumer_of_match[] = { + { .compatible = "regulator-virtual-consumer" }, + {}, +}; +MODULE_DEVICE_TABLE(of, regulator_virtual_consumer_of_match); +#endif + static int regulator_virtual_probe(struct platform_device *pdev) { char *reg_id = dev_get_platdata(&pdev->dev); struct virtual_consumer_data *drvdata; + static bool warned; int ret; + if (!warned) { + warned = true; + pr_warn("**********************************************************\n"); + pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); + pr_warn("** **\n"); + pr_warn("** regulator-virtual-consumer is only for testing and **\n"); + pr_warn("** debugging. Do not use it in a production kernel. **\n"); + pr_warn("** **\n"); + pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); + pr_warn("**********************************************************\n"); + } + drvdata = devm_kzalloc(&pdev->dev, sizeof(struct virtual_consumer_data), GFP_KERNEL); if (drvdata == NULL) return -ENOMEM; + /* + * This virtual consumer does not have any hardware-defined supply + * name, so just allow the regulator to be specified in a property + * named "default-supply" when we're being probed from devicetree. + */ + if (!reg_id && pdev->dev.of_node) + reg_id = "default"; + mutex_init(&drvdata->lock); drvdata->regulator = devm_regulator_get(&pdev->dev, reg_id); - if (IS_ERR(drvdata->regulator)) { - ret = PTR_ERR(drvdata->regulator); - dev_err(&pdev->dev, "Failed to obtain supply '%s': %d\n", - reg_id, ret); - return ret; - } + if (IS_ERR(drvdata->regulator)) + return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->regulator), + "Failed to obtain supply '%s'\n", + reg_id); ret = sysfs_create_group(&pdev->dev.kobj, ®ulator_virtual_attr_group); @@ -321,7 +345,7 @@ static int regulator_virtual_probe(struct platform_device *pdev) return 0; } -static int regulator_virtual_remove(struct platform_device *pdev) +static void regulator_virtual_remove(struct platform_device *pdev) { struct virtual_consumer_data *drvdata = platform_get_drvdata(pdev); @@ -329,8 +353,6 @@ static int regulator_virtual_remove(struct platform_device *pdev) if (drvdata->enabled) regulator_disable(drvdata->regulator); - - return 0; } static struct platform_driver regulator_virtual_consumer_driver = { @@ -338,6 +360,8 @@ static struct platform_driver regulator_virtual_consumer_driver = { .remove = regulator_virtual_remove, .driver = { .name = "reg-virt-consumer", + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + .of_match_table = of_match_ptr(regulator_virtual_consumer_of_match), }, }; |