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| 1 | /* |
| 2 | * userspace-consumer.c |
| 3 | * |
| 4 | * Copyright 2009 CompuLab, Ltd. |
| 5 | * |
| 6 | * Author: Mike Rapoport <mike@compulab.co.il> |
| 7 | * |
| 8 | * Based of virtual consumer driver: |
| 9 | * Copyright 2008 Wolfson Microelectronics PLC. |
| 10 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License as |
| 14 | * published by the Free Software Foundation; either version 2 of the |
| 15 | * License, or (at your option) any later version. |
| 16 | * |
| 17 | */ |
| 18 | |
| 19 | #include <linux/err.h> |
| 20 | #include <linux/mutex.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/platform_device.h> |
| 23 | #include <linux/regulator/consumer.h> |
| 24 | #include <linux/regulator/userspace-consumer.h> |
| 25 | #include <linux/slab.h> |
| 26 | |
| 27 | struct userspace_consumer_data { |
| 28 | const char *name; |
| 29 | |
| 30 | struct mutex lock; |
| 31 | bool enabled; |
| 32 | |
| 33 | int num_supplies; |
| 34 | struct regulator_bulk_data *supplies; |
| 35 | }; |
| 36 | |
| 37 | static ssize_t reg_show_name(struct device *dev, |
| 38 | struct device_attribute *attr, char *buf) |
| 39 | { |
| 40 | struct userspace_consumer_data *data = dev_get_drvdata(dev); |
| 41 | |
| 42 | return sprintf(buf, "%s\n", data->name); |
| 43 | } |
| 44 | |
| 45 | static ssize_t reg_show_state(struct device *dev, |
| 46 | struct device_attribute *attr, char *buf) |
| 47 | { |
| 48 | struct userspace_consumer_data *data = dev_get_drvdata(dev); |
| 49 | |
| 50 | if (data->enabled) |
| 51 | return sprintf(buf, "enabled\n"); |
| 52 | |
| 53 | return sprintf(buf, "disabled\n"); |
| 54 | } |
| 55 | |
| 56 | static ssize_t reg_set_state(struct device *dev, struct device_attribute *attr, |
| 57 | const char *buf, size_t count) |
| 58 | { |
| 59 | struct userspace_consumer_data *data = dev_get_drvdata(dev); |
| 60 | bool enabled; |
| 61 | int ret; |
| 62 | |
| 63 | /* |
| 64 | * sysfs_streq() doesn't need the \n's, but we add them so the strings |
| 65 | * will be shared with show_state(), above. |
| 66 | */ |
| 67 | if (sysfs_streq(buf, "enabled\n") || sysfs_streq(buf, "1")) |
| 68 | enabled = true; |
| 69 | else if (sysfs_streq(buf, "disabled\n") || sysfs_streq(buf, "0")) |
| 70 | enabled = false; |
| 71 | else { |
| 72 | dev_err(dev, "Configuring invalid mode\n"); |
| 73 | return count; |
| 74 | } |
| 75 | |
| 76 | mutex_lock(&data->lock); |
| 77 | if (enabled != data->enabled) { |
| 78 | if (enabled) |
| 79 | ret = regulator_bulk_enable(data->num_supplies, |
| 80 | data->supplies); |
| 81 | else |
| 82 | ret = regulator_bulk_disable(data->num_supplies, |
| 83 | data->supplies); |
| 84 | |
| 85 | if (ret == 0) |
| 86 | data->enabled = enabled; |
| 87 | else |
| 88 | dev_err(dev, "Failed to configure state: %d\n", ret); |
| 89 | } |
| 90 | mutex_unlock(&data->lock); |
| 91 | |
| 92 | return count; |
| 93 | } |
| 94 | |
| 95 | static DEVICE_ATTR(name, 0444, reg_show_name, NULL); |
| 96 | static DEVICE_ATTR(state, 0644, reg_show_state, reg_set_state); |
| 97 | |
| 98 | static struct attribute *attributes[] = { |
| 99 | &dev_attr_name.attr, |
| 100 | &dev_attr_state.attr, |
| 101 | NULL, |
| 102 | }; |
| 103 | |
| 104 | static const struct attribute_group attr_group = { |
| 105 | .attrs = attributes, |
| 106 | }; |
| 107 | |
| 108 | static int regulator_userspace_consumer_probe(struct platform_device *pdev) |
| 109 | { |
| 110 | struct regulator_userspace_consumer_data *pdata; |
| 111 | struct userspace_consumer_data *drvdata; |
| 112 | int ret; |
| 113 | |
| 114 | pdata = pdev->dev.platform_data; |
| 115 | if (!pdata) |
| 116 | return -EINVAL; |
| 117 | |
| 118 | drvdata = devm_kzalloc(&pdev->dev, |
| 119 | sizeof(struct userspace_consumer_data), |
| 120 | GFP_KERNEL); |
| 121 | if (drvdata == NULL) |
| 122 | return -ENOMEM; |
| 123 | |
| 124 | drvdata->name = pdata->name; |
| 125 | drvdata->num_supplies = pdata->num_supplies; |
| 126 | drvdata->supplies = pdata->supplies; |
| 127 | |
| 128 | mutex_init(&drvdata->lock); |
| 129 | |
| 130 | ret = devm_regulator_bulk_get(&pdev->dev, drvdata->num_supplies, |
| 131 | drvdata->supplies); |
| 132 | if (ret) { |
| 133 | dev_err(&pdev->dev, "Failed to get supplies: %d\n", ret); |
| 134 | return ret; |
| 135 | } |
| 136 | |
| 137 | ret = sysfs_create_group(&pdev->dev.kobj, &attr_group); |
| 138 | if (ret != 0) |
| 139 | return ret; |
| 140 | |
| 141 | if (pdata->init_on) { |
| 142 | ret = regulator_bulk_enable(drvdata->num_supplies, |
| 143 | drvdata->supplies); |
| 144 | if (ret) { |
| 145 | dev_err(&pdev->dev, |
| 146 | "Failed to set initial state: %d\n", ret); |
| 147 | goto err_enable; |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | drvdata->enabled = pdata->init_on; |
| 152 | platform_set_drvdata(pdev, drvdata); |
| 153 | |
| 154 | return 0; |
| 155 | |
| 156 | err_enable: |
| 157 | sysfs_remove_group(&pdev->dev.kobj, &attr_group); |
| 158 | |
| 159 | return ret; |
| 160 | } |
| 161 | |
| 162 | static int regulator_userspace_consumer_remove(struct platform_device *pdev) |
| 163 | { |
| 164 | struct userspace_consumer_data *data = platform_get_drvdata(pdev); |
| 165 | |
| 166 | sysfs_remove_group(&pdev->dev.kobj, &attr_group); |
| 167 | |
| 168 | if (data->enabled) |
| 169 | regulator_bulk_disable(data->num_supplies, data->supplies); |
| 170 | |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | static struct platform_driver regulator_userspace_consumer_driver = { |
| 175 | .probe = regulator_userspace_consumer_probe, |
| 176 | .remove = regulator_userspace_consumer_remove, |
| 177 | .driver = { |
| 178 | .name = "reg-userspace-consumer", |
| 179 | }, |
| 180 | }; |
| 181 | |
| 182 | module_platform_driver(regulator_userspace_consumer_driver); |
| 183 | |
| 184 | MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>"); |
| 185 | MODULE_DESCRIPTION("Userspace consumer for voltage and current regulators"); |
| 186 | MODULE_LICENSE("GPL"); |
| 187 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9
