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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> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
1d98cccf MR |
25 | |
26 | struct userspace_consumer_data { | |
27 | const char *name; | |
28 | ||
29 | struct mutex lock; | |
30 | bool enabled; | |
31 | ||
32 | int num_supplies; | |
33 | struct regulator_bulk_data *supplies; | |
34 | }; | |
35 | ||
7c314991 | 36 | static ssize_t reg_show_name(struct device *dev, |
1d98cccf MR |
37 | struct device_attribute *attr, char *buf) |
38 | { | |
39 | struct userspace_consumer_data *data = dev_get_drvdata(dev); | |
40 | ||
41 | return sprintf(buf, "%s\n", data->name); | |
42 | } | |
43 | ||
7c314991 | 44 | static ssize_t reg_show_state(struct device *dev, |
1d98cccf MR |
45 | struct device_attribute *attr, char *buf) |
46 | { | |
47 | struct userspace_consumer_data *data = dev_get_drvdata(dev); | |
48 | ||
49 | if (data->enabled) | |
50 | return sprintf(buf, "enabled\n"); | |
51 | ||
52 | return sprintf(buf, "disabled\n"); | |
53 | } | |
54 | ||
7c314991 | 55 | static ssize_t reg_set_state(struct device *dev, struct device_attribute *attr, |
1d98cccf MR |
56 | const char *buf, size_t count) |
57 | { | |
58 | struct userspace_consumer_data *data = dev_get_drvdata(dev); | |
59 | bool enabled; | |
60 | int ret; | |
61 | ||
62 | /* | |
63 | * sysfs_streq() doesn't need the \n's, but we add them so the strings | |
64 | * will be shared with show_state(), above. | |
65 | */ | |
66 | if (sysfs_streq(buf, "enabled\n") || sysfs_streq(buf, "1")) | |
67 | enabled = true; | |
68 | else if (sysfs_streq(buf, "disabled\n") || sysfs_streq(buf, "0")) | |
69 | enabled = false; | |
70 | else { | |
71 | dev_err(dev, "Configuring invalid mode\n"); | |
72 | return count; | |
73 | } | |
74 | ||
75 | mutex_lock(&data->lock); | |
76 | if (enabled != data->enabled) { | |
77 | if (enabled) | |
78 | ret = regulator_bulk_enable(data->num_supplies, | |
79 | data->supplies); | |
80 | else | |
81 | ret = regulator_bulk_disable(data->num_supplies, | |
82 | data->supplies); | |
83 | ||
84 | if (ret == 0) | |
85 | data->enabled = enabled; | |
86 | else | |
87 | dev_err(dev, "Failed to configure state: %d\n", ret); | |
88 | } | |
89 | mutex_unlock(&data->lock); | |
90 | ||
91 | return count; | |
92 | } | |
93 | ||
7c314991 LG |
94 | static DEVICE_ATTR(name, 0444, reg_show_name, NULL); |
95 | static DEVICE_ATTR(state, 0644, reg_show_state, reg_set_state); | |
1d98cccf | 96 | |
e9d62698 FB |
97 | static struct attribute *attributes[] = { |
98 | &dev_attr_name.attr, | |
99 | &dev_attr_state.attr, | |
100 | NULL, | |
101 | }; | |
102 | ||
103 | static const struct attribute_group attr_group = { | |
104 | .attrs = attributes, | |
1d98cccf MR |
105 | }; |
106 | ||
107 | static int regulator_userspace_consumer_probe(struct platform_device *pdev) | |
108 | { | |
109 | struct regulator_userspace_consumer_data *pdata; | |
110 | struct userspace_consumer_data *drvdata; | |
e9d62698 | 111 | int ret; |
1d98cccf MR |
112 | |
113 | pdata = pdev->dev.platform_data; | |
114 | if (!pdata) | |
115 | return -EINVAL; | |
116 | ||
117 | drvdata = kzalloc(sizeof(struct userspace_consumer_data), GFP_KERNEL); | |
118 | if (drvdata == NULL) | |
119 | return -ENOMEM; | |
120 | ||
121 | drvdata->name = pdata->name; | |
122 | drvdata->num_supplies = pdata->num_supplies; | |
123 | drvdata->supplies = pdata->supplies; | |
124 | ||
125 | mutex_init(&drvdata->lock); | |
126 | ||
127 | ret = regulator_bulk_get(&pdev->dev, drvdata->num_supplies, | |
128 | drvdata->supplies); | |
129 | if (ret) { | |
130 | dev_err(&pdev->dev, "Failed to get supplies: %d\n", ret); | |
131 | goto err_alloc_supplies; | |
132 | } | |
133 | ||
e9d62698 FB |
134 | ret = sysfs_create_group(&pdev->dev.kobj, &attr_group); |
135 | if (ret != 0) | |
136 | goto err_create_attrs; | |
1d98cccf | 137 | |
e9d62698 | 138 | if (pdata->init_on) { |
1d98cccf MR |
139 | ret = regulator_bulk_enable(drvdata->num_supplies, |
140 | drvdata->supplies); | |
e9d62698 FB |
141 | if (ret) { |
142 | dev_err(&pdev->dev, | |
143 | "Failed to set initial state: %d\n", ret); | |
144 | goto err_enable; | |
145 | } | |
1d98cccf MR |
146 | } |
147 | ||
e9d62698 | 148 | drvdata->enabled = pdata->init_on; |
1d98cccf MR |
149 | platform_set_drvdata(pdev, drvdata); |
150 | ||
151 | return 0; | |
152 | ||
e9d62698 FB |
153 | err_enable: |
154 | sysfs_remove_group(&pdev->dev.kobj, &attr_group); | |
1d98cccf | 155 | |
e9d62698 | 156 | err_create_attrs: |
1d98cccf MR |
157 | regulator_bulk_free(drvdata->num_supplies, drvdata->supplies); |
158 | ||
159 | err_alloc_supplies: | |
160 | kfree(drvdata); | |
161 | return ret; | |
162 | } | |
163 | ||
164 | static int regulator_userspace_consumer_remove(struct platform_device *pdev) | |
165 | { | |
166 | struct userspace_consumer_data *data = platform_get_drvdata(pdev); | |
1d98cccf | 167 | |
e9d62698 | 168 | sysfs_remove_group(&pdev->dev.kobj, &attr_group); |
1d98cccf MR |
169 | |
170 | if (data->enabled) | |
171 | regulator_bulk_disable(data->num_supplies, data->supplies); | |
172 | ||
173 | regulator_bulk_free(data->num_supplies, data->supplies); | |
174 | kfree(data); | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | static struct platform_driver regulator_userspace_consumer_driver = { | |
180 | .probe = regulator_userspace_consumer_probe, | |
181 | .remove = regulator_userspace_consumer_remove, | |
182 | .driver = { | |
183 | .name = "reg-userspace-consumer", | |
184 | }, | |
185 | }; | |
186 | ||
187 | ||
188 | static int __init regulator_userspace_consumer_init(void) | |
189 | { | |
190 | return platform_driver_register(®ulator_userspace_consumer_driver); | |
191 | } | |
192 | module_init(regulator_userspace_consumer_init); | |
193 | ||
194 | static void __exit regulator_userspace_consumer_exit(void) | |
195 | { | |
196 | platform_driver_unregister(®ulator_userspace_consumer_driver); | |
197 | } | |
198 | module_exit(regulator_userspace_consumer_exit); | |
199 | ||
200 | MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>"); | |
201 | MODULE_DESCRIPTION("Userspace consumer for voltage and current regulators"); | |
202 | MODULE_LICENSE("GPL"); |