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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226// SPDX-License-Identifier: GPL-2.0-or-later/* * userspace-consumer.c * * Copyright 2009 CompuLab, Ltd. * * Author: Mike Rapoport <mike@compulab.co.il> * * Based of virtual consumer driver: * Copyright 2008 Wolfson Microelectronics PLC. * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> */
#include <linux/err.h>#include <linux/mutex.h>#include <linux/module.h>#include <linux/of.h>#include <linux/platform_device.h>#include <linux/regulator/consumer.h>#include <linux/regulator/userspace-consumer.h>#include <linux/slab.h>
struct userspace_consumer_data { const char *name;
struct mutex lock; bool enabled; bool no_autoswitch;
int num_supplies; struct regulator_bulk_data *supplies;};
static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf){ struct userspace_consumer_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", data->name);}
static ssize_t state_show(struct device *dev, struct device_attribute *attr, char *buf){ struct userspace_consumer_data *data = dev_get_drvdata(dev);
if (data->enabled) return sprintf(buf, "enabled\n");
return sprintf(buf, "disabled\n");}
static ssize_t state_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count){ struct userspace_consumer_data *data = dev_get_drvdata(dev); bool enabled; int ret;
/* * sysfs_streq() doesn't need the \n's, but we add them so the strings * will be shared with show_state(), above. */ if (sysfs_streq(buf, "enabled\n") || sysfs_streq(buf, "1")) enabled = true; else if (sysfs_streq(buf, "disabled\n") || sysfs_streq(buf, "0")) enabled = false; else { dev_err(dev, "Configuring invalid mode\n"); return count; }
mutex_lock(&data->lock); if (enabled != data->enabled) { if (enabled) ret = regulator_bulk_enable(data->num_supplies, data->supplies); else ret = regulator_bulk_disable(data->num_supplies, data->supplies);
if (ret == 0) data->enabled = enabled; else dev_err(dev, "Failed to configure state: %d\n", ret); } mutex_unlock(&data->lock);
return count;}
static DEVICE_ATTR_RO(name);static DEVICE_ATTR_RW(state);
static struct attribute *attributes[] = { &dev_attr_name.attr, &dev_attr_state.attr, NULL,};
static umode_t attr_visible(struct kobject *kobj, struct attribute *attr, int idx){ struct device *dev = kobj_to_dev(kobj); struct userspace_consumer_data *data = dev_get_drvdata(dev);
/* If a name hasn't been set, don't bother with the attribute */ if (attr == &dev_attr_name.attr && !data->name) return 0;
return attr->mode;}
static const struct attribute_group attr_group = { .attrs = attributes, .is_visible = attr_visible,};
static int regulator_userspace_consumer_probe(struct platform_device *pdev){ struct regulator_userspace_consumer_data tmpdata; struct regulator_userspace_consumer_data *pdata; struct userspace_consumer_data *drvdata; int ret;
pdata = dev_get_platdata(&pdev->dev); if (!pdata) { if (!pdev->dev.of_node) return -EINVAL;
pdata = &tmpdata; memset(pdata, 0, sizeof(*pdata));
pdata->no_autoswitch = true; pdata->num_supplies = 1; pdata->supplies = devm_kzalloc(&pdev->dev, sizeof(*pdata->supplies), GFP_KERNEL); if (!pdata->supplies) return -ENOMEM; pdata->supplies[0].supply = "vout"; }
if (pdata->num_supplies < 1) { dev_err(&pdev->dev, "At least one supply required\n"); return -EINVAL; }
drvdata = devm_kzalloc(&pdev->dev, sizeof(struct userspace_consumer_data), GFP_KERNEL); if (drvdata == NULL) return -ENOMEM;
drvdata->name = pdata->name; drvdata->num_supplies = pdata->num_supplies; drvdata->supplies = pdata->supplies; drvdata->no_autoswitch = pdata->no_autoswitch;
mutex_init(&drvdata->lock);
ret = devm_regulator_bulk_get_exclusive(&pdev->dev, drvdata->num_supplies, drvdata->supplies); if (ret) return dev_err_probe(&pdev->dev, ret, "Failed to get supplies\n");
platform_set_drvdata(pdev, drvdata);
ret = sysfs_create_group(&pdev->dev.kobj, &attr_group); if (ret != 0) return ret;
if (pdata->init_on && !pdata->no_autoswitch) { ret = regulator_bulk_enable(drvdata->num_supplies, drvdata->supplies); if (ret) { dev_err(&pdev->dev, "Failed to set initial state: %d\n", ret); goto err_enable; } }
ret = regulator_is_enabled(pdata->supplies[0].consumer); if (ret < 0) { dev_err(&pdev->dev, "Failed to get regulator status\n"); goto err_enable; } drvdata->enabled = !!ret;
return 0;
err_enable: sysfs_remove_group(&pdev->dev.kobj, &attr_group);
return ret;}
static void regulator_userspace_consumer_remove(struct platform_device *pdev){ struct userspace_consumer_data *data = platform_get_drvdata(pdev);
sysfs_remove_group(&pdev->dev.kobj, &attr_group);
if (data->enabled && !data->no_autoswitch) regulator_bulk_disable(data->num_supplies, data->supplies);}
static const struct of_device_id regulator_userspace_consumer_of_match[] = { { .compatible = "regulator-output", }, {},};MODULE_DEVICE_TABLE(of, regulator_userspace_consumer_of_match);
static struct platform_driver regulator_userspace_consumer_driver = { .probe = regulator_userspace_consumer_probe, .remove = regulator_userspace_consumer_remove, .driver = { .name = "reg-userspace-consumer", .probe_type = PROBE_PREFER_ASYNCHRONOUS, .of_match_table = regulator_userspace_consumer_of_match, },};
module_platform_driver(regulator_userspace_consumer_driver);
MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");MODULE_DESCRIPTION("Userspace consumer for voltage and current regulators");MODULE_LICENSE("GPL");