12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
21d98cccfSMike Rapoport /*
31d98cccfSMike Rapoport * userspace-consumer.c
41d98cccfSMike Rapoport *
51d98cccfSMike Rapoport * Copyright 2009 CompuLab, Ltd.
61d98cccfSMike Rapoport *
71d98cccfSMike Rapoport * Author: Mike Rapoport <mike@compulab.co.il>
81d98cccfSMike Rapoport *
91d98cccfSMike Rapoport * Based of virtual consumer driver:
101d98cccfSMike Rapoport * Copyright 2008 Wolfson Microelectronics PLC.
111d98cccfSMike Rapoport * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
121d98cccfSMike Rapoport */
131d98cccfSMike Rapoport
141d98cccfSMike Rapoport #include <linux/err.h>
151d98cccfSMike Rapoport #include <linux/mutex.h>
1665602c32SPaul Gortmaker #include <linux/module.h>
175c51d4afSZev Weiss #include <linux/of.h>
181d98cccfSMike Rapoport #include <linux/platform_device.h>
191d98cccfSMike Rapoport #include <linux/regulator/consumer.h>
201d98cccfSMike Rapoport #include <linux/regulator/userspace-consumer.h>
215a0e3ad6STejun Heo #include <linux/slab.h>
221d98cccfSMike Rapoport
231d98cccfSMike Rapoport struct userspace_consumer_data {
241d98cccfSMike Rapoport const char *name;
251d98cccfSMike Rapoport
261d98cccfSMike Rapoport struct mutex lock;
271d98cccfSMike Rapoport bool enabled;
285c51d4afSZev Weiss bool no_autoswitch;
291d98cccfSMike Rapoport
301d98cccfSMike Rapoport int num_supplies;
311d98cccfSMike Rapoport struct regulator_bulk_data *supplies;
321d98cccfSMike Rapoport };
331d98cccfSMike Rapoport
name_show(struct device * dev,struct device_attribute * attr,char * buf)34ba499a50SZhen Lei static ssize_t name_show(struct device *dev,
351d98cccfSMike Rapoport struct device_attribute *attr, char *buf)
361d98cccfSMike Rapoport {
371d98cccfSMike Rapoport struct userspace_consumer_data *data = dev_get_drvdata(dev);
381d98cccfSMike Rapoport
391d98cccfSMike Rapoport return sprintf(buf, "%s\n", data->name);
401d98cccfSMike Rapoport }
411d98cccfSMike Rapoport
state_show(struct device * dev,struct device_attribute * attr,char * buf)42ba499a50SZhen Lei static ssize_t state_show(struct device *dev,
431d98cccfSMike Rapoport struct device_attribute *attr, char *buf)
441d98cccfSMike Rapoport {
451d98cccfSMike Rapoport struct userspace_consumer_data *data = dev_get_drvdata(dev);
461d98cccfSMike Rapoport
471d98cccfSMike Rapoport if (data->enabled)
481d98cccfSMike Rapoport return sprintf(buf, "enabled\n");
491d98cccfSMike Rapoport
501d98cccfSMike Rapoport return sprintf(buf, "disabled\n");
511d98cccfSMike Rapoport }
521d98cccfSMike Rapoport
state_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)53ba499a50SZhen Lei static ssize_t state_store(struct device *dev, struct device_attribute *attr,
541d98cccfSMike Rapoport const char *buf, size_t count)
551d98cccfSMike Rapoport {
561d98cccfSMike Rapoport struct userspace_consumer_data *data = dev_get_drvdata(dev);
571d98cccfSMike Rapoport bool enabled;
581d98cccfSMike Rapoport int ret;
591d98cccfSMike Rapoport
601d98cccfSMike Rapoport /*
611d98cccfSMike Rapoport * sysfs_streq() doesn't need the \n's, but we add them so the strings
621d98cccfSMike Rapoport * will be shared with show_state(), above.
631d98cccfSMike Rapoport */
641d98cccfSMike Rapoport if (sysfs_streq(buf, "enabled\n") || sysfs_streq(buf, "1"))
651d98cccfSMike Rapoport enabled = true;
661d98cccfSMike Rapoport else if (sysfs_streq(buf, "disabled\n") || sysfs_streq(buf, "0"))
671d98cccfSMike Rapoport enabled = false;
681d98cccfSMike Rapoport else {
691d98cccfSMike Rapoport dev_err(dev, "Configuring invalid mode\n");
701d98cccfSMike Rapoport return count;
711d98cccfSMike Rapoport }
721d98cccfSMike Rapoport
731d98cccfSMike Rapoport mutex_lock(&data->lock);
741d98cccfSMike Rapoport if (enabled != data->enabled) {
751d98cccfSMike Rapoport if (enabled)
761d98cccfSMike Rapoport ret = regulator_bulk_enable(data->num_supplies,
771d98cccfSMike Rapoport data->supplies);
781d98cccfSMike Rapoport else
791d98cccfSMike Rapoport ret = regulator_bulk_disable(data->num_supplies,
801d98cccfSMike Rapoport data->supplies);
811d98cccfSMike Rapoport
821d98cccfSMike Rapoport if (ret == 0)
831d98cccfSMike Rapoport data->enabled = enabled;
841d98cccfSMike Rapoport else
851d98cccfSMike Rapoport dev_err(dev, "Failed to configure state: %d\n", ret);
861d98cccfSMike Rapoport }
871d98cccfSMike Rapoport mutex_unlock(&data->lock);
881d98cccfSMike Rapoport
891d98cccfSMike Rapoport return count;
901d98cccfSMike Rapoport }
911d98cccfSMike Rapoport
92ba499a50SZhen Lei static DEVICE_ATTR_RO(name);
93ba499a50SZhen Lei static DEVICE_ATTR_RW(state);
941d98cccfSMike Rapoport
95e9d62698SFelipe Balbi static struct attribute *attributes[] = {
96e9d62698SFelipe Balbi &dev_attr_name.attr,
97e9d62698SFelipe Balbi &dev_attr_state.attr,
98e9d62698SFelipe Balbi NULL,
99e9d62698SFelipe Balbi };
100e9d62698SFelipe Balbi
attr_visible(struct kobject * kobj,struct attribute * attr,int idx)1015c51d4afSZev Weiss static umode_t attr_visible(struct kobject *kobj, struct attribute *attr, int idx)
1025c51d4afSZev Weiss {
1035c51d4afSZev Weiss struct device *dev = kobj_to_dev(kobj);
1045c51d4afSZev Weiss struct userspace_consumer_data *data = dev_get_drvdata(dev);
1055c51d4afSZev Weiss
1065c51d4afSZev Weiss /* If a name hasn't been set, don't bother with the attribute */
1075c51d4afSZev Weiss if (attr == &dev_attr_name.attr && !data->name)
1085c51d4afSZev Weiss return 0;
1095c51d4afSZev Weiss
1105c51d4afSZev Weiss return attr->mode;
1115c51d4afSZev Weiss }
1125c51d4afSZev Weiss
113e9d62698SFelipe Balbi static const struct attribute_group attr_group = {
114e9d62698SFelipe Balbi .attrs = attributes,
1155c51d4afSZev Weiss .is_visible = attr_visible,
1161d98cccfSMike Rapoport };
1171d98cccfSMike Rapoport
regulator_userspace_consumer_probe(struct platform_device * pdev)1181d98cccfSMike Rapoport static int regulator_userspace_consumer_probe(struct platform_device *pdev)
1191d98cccfSMike Rapoport {
1205c51d4afSZev Weiss struct regulator_userspace_consumer_data tmpdata;
1211d98cccfSMike Rapoport struct regulator_userspace_consumer_data *pdata;
1221d98cccfSMike Rapoport struct userspace_consumer_data *drvdata;
123e9d62698SFelipe Balbi int ret;
1241d98cccfSMike Rapoport
125dff91d0bSJingoo Han pdata = dev_get_platdata(&pdev->dev);
1265c51d4afSZev Weiss if (!pdata) {
1275c51d4afSZev Weiss if (!pdev->dev.of_node)
1281d98cccfSMike Rapoport return -EINVAL;
1291d98cccfSMike Rapoport
1305c51d4afSZev Weiss pdata = &tmpdata;
1315c51d4afSZev Weiss memset(pdata, 0, sizeof(*pdata));
1325c51d4afSZev Weiss
1335c51d4afSZev Weiss pdata->no_autoswitch = true;
1345c51d4afSZev Weiss pdata->num_supplies = 1;
1355c51d4afSZev Weiss pdata->supplies = devm_kzalloc(&pdev->dev, sizeof(*pdata->supplies), GFP_KERNEL);
1365c51d4afSZev Weiss if (!pdata->supplies)
1375c51d4afSZev Weiss return -ENOMEM;
1385c51d4afSZev Weiss pdata->supplies[0].supply = "vout";
1395c51d4afSZev Weiss }
1405c51d4afSZev Weiss
1415c51d4afSZev Weiss if (pdata->num_supplies < 1) {
1425c51d4afSZev Weiss dev_err(&pdev->dev, "At least one supply required\n");
1435c51d4afSZev Weiss return -EINVAL;
1445c51d4afSZev Weiss }
1455c51d4afSZev Weiss
1465abe0c40SAxel Lin drvdata = devm_kzalloc(&pdev->dev,
1475abe0c40SAxel Lin sizeof(struct userspace_consumer_data),
1485abe0c40SAxel Lin GFP_KERNEL);
1491d98cccfSMike Rapoport if (drvdata == NULL)
1501d98cccfSMike Rapoport return -ENOMEM;
1511d98cccfSMike Rapoport
1521d98cccfSMike Rapoport drvdata->name = pdata->name;
1531d98cccfSMike Rapoport drvdata->num_supplies = pdata->num_supplies;
1541d98cccfSMike Rapoport drvdata->supplies = pdata->supplies;
1555c51d4afSZev Weiss drvdata->no_autoswitch = pdata->no_autoswitch;
1561d98cccfSMike Rapoport
1571d98cccfSMike Rapoport mutex_init(&drvdata->lock);
1581d98cccfSMike Rapoport
1595c51d4afSZev Weiss ret = devm_regulator_bulk_get_exclusive(&pdev->dev, drvdata->num_supplies,
1601d98cccfSMike Rapoport drvdata->supplies);
1611d98cccfSMike Rapoport if (ret) {
1621d98cccfSMike Rapoport dev_err(&pdev->dev, "Failed to get supplies: %d\n", ret);
1635abe0c40SAxel Lin return ret;
1641d98cccfSMike Rapoport }
1651d98cccfSMike Rapoport
1665c51d4afSZev Weiss platform_set_drvdata(pdev, drvdata);
1675c51d4afSZev Weiss
168e9d62698SFelipe Balbi ret = sysfs_create_group(&pdev->dev.kobj, &attr_group);
1691d98cccfSMike Rapoport if (ret != 0)
1705abe0c40SAxel Lin return ret;
1711d98cccfSMike Rapoport
1725c51d4afSZev Weiss if (pdata->init_on && !pdata->no_autoswitch) {
1731d98cccfSMike Rapoport ret = regulator_bulk_enable(drvdata->num_supplies,
1741d98cccfSMike Rapoport drvdata->supplies);
1751d98cccfSMike Rapoport if (ret) {
176e9d62698SFelipe Balbi dev_err(&pdev->dev,
177e9d62698SFelipe Balbi "Failed to set initial state: %d\n", ret);
178e9d62698SFelipe Balbi goto err_enable;
179e9d62698SFelipe Balbi }
1801d98cccfSMike Rapoport }
1811d98cccfSMike Rapoport
1825c51d4afSZev Weiss ret = regulator_is_enabled(pdata->supplies[0].consumer);
1835c51d4afSZev Weiss if (ret < 0) {
1845c51d4afSZev Weiss dev_err(&pdev->dev, "Failed to get regulator status\n");
1855c51d4afSZev Weiss goto err_enable;
1865c51d4afSZev Weiss }
1875c51d4afSZev Weiss drvdata->enabled = !!ret;
1881d98cccfSMike Rapoport
1891d98cccfSMike Rapoport return 0;
1901d98cccfSMike Rapoport
191e9d62698SFelipe Balbi err_enable:
192e9d62698SFelipe Balbi sysfs_remove_group(&pdev->dev.kobj, &attr_group);
1931d98cccfSMike Rapoport
1941d98cccfSMike Rapoport return ret;
1951d98cccfSMike Rapoport }
1961d98cccfSMike Rapoport
regulator_userspace_consumer_remove(struct platform_device * pdev)1971d98cccfSMike Rapoport static int regulator_userspace_consumer_remove(struct platform_device *pdev)
1981d98cccfSMike Rapoport {
1991d98cccfSMike Rapoport struct userspace_consumer_data *data = platform_get_drvdata(pdev);
2001d98cccfSMike Rapoport
201e9d62698SFelipe Balbi sysfs_remove_group(&pdev->dev.kobj, &attr_group);
2021d98cccfSMike Rapoport
2035c51d4afSZev Weiss if (data->enabled && !data->no_autoswitch)
2041d98cccfSMike Rapoport regulator_bulk_disable(data->num_supplies, data->supplies);
2051d98cccfSMike Rapoport
2061d98cccfSMike Rapoport return 0;
2071d98cccfSMike Rapoport }
2081d98cccfSMike Rapoport
2095c51d4afSZev Weiss static const struct of_device_id regulator_userspace_consumer_of_match[] = {
2105c51d4afSZev Weiss { .compatible = "regulator-output", },
2115c51d4afSZev Weiss {},
2125c51d4afSZev Weiss };
213*271d0efeSJohn Keeping MODULE_DEVICE_TABLE(of, regulator_userspace_consumer_of_match);
2145c51d4afSZev Weiss
2151d98cccfSMike Rapoport static struct platform_driver regulator_userspace_consumer_driver = {
2161d98cccfSMike Rapoport .probe = regulator_userspace_consumer_probe,
2171d98cccfSMike Rapoport .remove = regulator_userspace_consumer_remove,
2181d98cccfSMike Rapoport .driver = {
2191d98cccfSMike Rapoport .name = "reg-userspace-consumer",
220259b93b2SDouglas Anderson .probe_type = PROBE_PREFER_ASYNCHRONOUS,
2215c51d4afSZev Weiss .of_match_table = regulator_userspace_consumer_of_match,
2221d98cccfSMike Rapoport },
2231d98cccfSMike Rapoport };
2241d98cccfSMike Rapoport
225005d610fSAxel Lin module_platform_driver(regulator_userspace_consumer_driver);
2261d98cccfSMike Rapoport
2271d98cccfSMike Rapoport MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
2281d98cccfSMike Rapoport MODULE_DESCRIPTION("Userspace consumer for voltage and current regulators");
2291d98cccfSMike Rapoport MODULE_LICENSE("GPL");
230