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1d98cccf MR |
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/platform_device.h> | |
22 | #include <linux/regulator/consumer.h> | |
23 | #include <linux/regulator/userspace-consumer.h> | |
24 | ||
25 | struct userspace_consumer_data { | |
26 | const char *name; | |
27 | ||
28 | struct mutex lock; | |
29 | bool enabled; | |
30 | ||
31 | int num_supplies; | |
32 | struct regulator_bulk_data *supplies; | |
33 | }; | |
34 | ||
7c314991 | 35 | static ssize_t reg_show_name(struct device *dev, |
1d98cccf MR |
36 | struct device_attribute *attr, char *buf) |
37 | { | |
38 | struct userspace_consumer_data *data = dev_get_drvdata(dev); | |
39 | ||
40 | return sprintf(buf, "%s\n", data->name); | |
41 | } | |
42 | ||
7c314991 | 43 | static ssize_t reg_show_state(struct device *dev, |
1d98cccf MR |
44 | struct device_attribute *attr, char *buf) |
45 | { | |
46 | struct userspace_consumer_data *data = dev_get_drvdata(dev); | |
47 | ||
48 | if (data->enabled) | |
49 | return sprintf(buf, "enabled\n"); | |
50 | ||
51 | return sprintf(buf, "disabled\n"); | |
52 | } | |
53 | ||
7c314991 | 54 | static ssize_t reg_set_state(struct device *dev, struct device_attribute *attr, |
1d98cccf MR |
55 | const char *buf, size_t count) |
56 | { | |
57 | struct userspace_consumer_data *data = dev_get_drvdata(dev); | |
58 | bool enabled; | |
59 | int ret; | |
60 | ||
61 | /* | |
62 | * sysfs_streq() doesn't need the \n's, but we add them so the strings | |
63 | * will be shared with show_state(), above. | |
64 | */ | |
65 | if (sysfs_streq(buf, "enabled\n") || sysfs_streq(buf, "1")) | |
66 | enabled = true; | |
67 | else if (sysfs_streq(buf, "disabled\n") || sysfs_streq(buf, "0")) | |
68 | enabled = false; | |
69 | else { | |
70 | dev_err(dev, "Configuring invalid mode\n"); | |
71 | return count; | |
72 | } | |
73 | ||
74 | mutex_lock(&data->lock); | |
75 | if (enabled != data->enabled) { | |
76 | if (enabled) | |
77 | ret = regulator_bulk_enable(data->num_supplies, | |
78 | data->supplies); | |
79 | else | |
80 | ret = regulator_bulk_disable(data->num_supplies, | |
81 | data->supplies); | |
82 | ||
83 | if (ret == 0) | |
84 | data->enabled = enabled; | |
85 | else | |
86 | dev_err(dev, "Failed to configure state: %d\n", ret); | |
87 | } | |
88 | mutex_unlock(&data->lock); | |
89 | ||
90 | return count; | |
91 | } | |
92 | ||
7c314991 LG |
93 | static DEVICE_ATTR(name, 0444, reg_show_name, NULL); |
94 | static DEVICE_ATTR(state, 0644, reg_show_state, reg_set_state); | |
1d98cccf | 95 | |
e9d62698 FB |
96 | static struct attribute *attributes[] = { |
97 | &dev_attr_name.attr, | |
98 | &dev_attr_state.attr, | |
99 | NULL, | |
100 | }; | |
101 | ||
102 | static const struct attribute_group attr_group = { | |
103 | .attrs = attributes, | |
1d98cccf MR |
104 | }; |
105 | ||
106 | static int regulator_userspace_consumer_probe(struct platform_device *pdev) | |
107 | { | |
108 | struct regulator_userspace_consumer_data *pdata; | |
109 | struct userspace_consumer_data *drvdata; | |
e9d62698 | 110 | int ret; |
1d98cccf MR |
111 | |
112 | pdata = pdev->dev.platform_data; | |
113 | if (!pdata) | |
114 | return -EINVAL; | |
115 | ||
116 | drvdata = kzalloc(sizeof(struct userspace_consumer_data), GFP_KERNEL); | |
117 | if (drvdata == NULL) | |
118 | return -ENOMEM; | |
119 | ||
120 | drvdata->name = pdata->name; | |
121 | drvdata->num_supplies = pdata->num_supplies; | |
122 | drvdata->supplies = pdata->supplies; | |
123 | ||
124 | mutex_init(&drvdata->lock); | |
125 | ||
126 | ret = regulator_bulk_get(&pdev->dev, drvdata->num_supplies, | |
127 | drvdata->supplies); | |
128 | if (ret) { | |
129 | dev_err(&pdev->dev, "Failed to get supplies: %d\n", ret); | |
130 | goto err_alloc_supplies; | |
131 | } | |
132 | ||
e9d62698 FB |
133 | ret = sysfs_create_group(&pdev->dev.kobj, &attr_group); |
134 | if (ret != 0) | |
135 | goto err_create_attrs; | |
1d98cccf | 136 | |
e9d62698 | 137 | if (pdata->init_on) { |
1d98cccf MR |
138 | ret = regulator_bulk_enable(drvdata->num_supplies, |
139 | drvdata->supplies); | |
e9d62698 FB |
140 | if (ret) { |
141 | dev_err(&pdev->dev, | |
142 | "Failed to set initial state: %d\n", ret); | |
143 | goto err_enable; | |
144 | } | |
1d98cccf MR |
145 | } |
146 | ||
e9d62698 | 147 | drvdata->enabled = pdata->init_on; |
1d98cccf MR |
148 | platform_set_drvdata(pdev, drvdata); |
149 | ||
150 | return 0; | |
151 | ||
e9d62698 FB |
152 | err_enable: |
153 | sysfs_remove_group(&pdev->dev.kobj, &attr_group); | |
1d98cccf | 154 | |
e9d62698 | 155 | err_create_attrs: |
1d98cccf MR |
156 | regulator_bulk_free(drvdata->num_supplies, drvdata->supplies); |
157 | ||
158 | err_alloc_supplies: | |
159 | kfree(drvdata); | |
160 | return ret; | |
161 | } | |
162 | ||
163 | static int regulator_userspace_consumer_remove(struct platform_device *pdev) | |
164 | { | |
165 | struct userspace_consumer_data *data = platform_get_drvdata(pdev); | |
1d98cccf | 166 | |
e9d62698 | 167 | sysfs_remove_group(&pdev->dev.kobj, &attr_group); |
1d98cccf MR |
168 | |
169 | if (data->enabled) | |
170 | regulator_bulk_disable(data->num_supplies, data->supplies); | |
171 | ||
172 | regulator_bulk_free(data->num_supplies, data->supplies); | |
173 | kfree(data); | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static struct platform_driver regulator_userspace_consumer_driver = { | |
179 | .probe = regulator_userspace_consumer_probe, | |
180 | .remove = regulator_userspace_consumer_remove, | |
181 | .driver = { | |
182 | .name = "reg-userspace-consumer", | |
183 | }, | |
184 | }; | |
185 | ||
186 | ||
187 | static int __init regulator_userspace_consumer_init(void) | |
188 | { | |
189 | return platform_driver_register(®ulator_userspace_consumer_driver); | |
190 | } | |
191 | module_init(regulator_userspace_consumer_init); | |
192 | ||
193 | static void __exit regulator_userspace_consumer_exit(void) | |
194 | { | |
195 | platform_driver_unregister(®ulator_userspace_consumer_driver); | |
196 | } | |
197 | module_exit(regulator_userspace_consumer_exit); | |
198 | ||
199 | MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>"); | |
200 | MODULE_DESCRIPTION("Userspace consumer for voltage and current regulators"); | |
201 | MODULE_LICENSE("GPL"); |