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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 MR |
95 | |
96 | static struct device_attribute *attributes[] = { | |
97 | &dev_attr_name, | |
98 | &dev_attr_state, | |
99 | }; | |
100 | ||
101 | static int regulator_userspace_consumer_probe(struct platform_device *pdev) | |
102 | { | |
103 | struct regulator_userspace_consumer_data *pdata; | |
104 | struct userspace_consumer_data *drvdata; | |
105 | int ret, i; | |
106 | ||
107 | pdata = pdev->dev.platform_data; | |
108 | if (!pdata) | |
109 | return -EINVAL; | |
110 | ||
111 | drvdata = kzalloc(sizeof(struct userspace_consumer_data), GFP_KERNEL); | |
112 | if (drvdata == NULL) | |
113 | return -ENOMEM; | |
114 | ||
115 | drvdata->name = pdata->name; | |
116 | drvdata->num_supplies = pdata->num_supplies; | |
117 | drvdata->supplies = pdata->supplies; | |
118 | ||
119 | mutex_init(&drvdata->lock); | |
120 | ||
121 | ret = regulator_bulk_get(&pdev->dev, drvdata->num_supplies, | |
122 | drvdata->supplies); | |
123 | if (ret) { | |
124 | dev_err(&pdev->dev, "Failed to get supplies: %d\n", ret); | |
125 | goto err_alloc_supplies; | |
126 | } | |
127 | ||
128 | for (i = 0; i < ARRAY_SIZE(attributes); i++) { | |
129 | ret = device_create_file(&pdev->dev, attributes[i]); | |
130 | if (ret != 0) | |
131 | goto err_create_attrs; | |
132 | } | |
133 | ||
134 | if (pdata->init_on) | |
135 | ret = regulator_bulk_enable(drvdata->num_supplies, | |
136 | drvdata->supplies); | |
137 | ||
138 | drvdata->enabled = pdata->init_on; | |
139 | ||
140 | if (ret) { | |
141 | dev_err(&pdev->dev, "Failed to set initial state: %d\n", ret); | |
142 | goto err_create_attrs; | |
143 | } | |
144 | ||
145 | platform_set_drvdata(pdev, drvdata); | |
146 | ||
147 | return 0; | |
148 | ||
149 | err_create_attrs: | |
150 | for (i = 0; i < ARRAY_SIZE(attributes); i++) | |
151 | device_remove_file(&pdev->dev, attributes[i]); | |
152 | ||
153 | regulator_bulk_free(drvdata->num_supplies, drvdata->supplies); | |
154 | ||
155 | err_alloc_supplies: | |
156 | kfree(drvdata); | |
157 | return ret; | |
158 | } | |
159 | ||
160 | static int regulator_userspace_consumer_remove(struct platform_device *pdev) | |
161 | { | |
162 | struct userspace_consumer_data *data = platform_get_drvdata(pdev); | |
163 | int i; | |
164 | ||
165 | for (i = 0; i < ARRAY_SIZE(attributes); i++) | |
166 | device_remove_file(&pdev->dev, attributes[i]); | |
167 | ||
168 | if (data->enabled) | |
169 | regulator_bulk_disable(data->num_supplies, data->supplies); | |
170 | ||
171 | regulator_bulk_free(data->num_supplies, data->supplies); | |
172 | kfree(data); | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | static struct platform_driver regulator_userspace_consumer_driver = { | |
178 | .probe = regulator_userspace_consumer_probe, | |
179 | .remove = regulator_userspace_consumer_remove, | |
180 | .driver = { | |
181 | .name = "reg-userspace-consumer", | |
182 | }, | |
183 | }; | |
184 | ||
185 | ||
186 | static int __init regulator_userspace_consumer_init(void) | |
187 | { | |
188 | return platform_driver_register(®ulator_userspace_consumer_driver); | |
189 | } | |
190 | module_init(regulator_userspace_consumer_init); | |
191 | ||
192 | static void __exit regulator_userspace_consumer_exit(void) | |
193 | { | |
194 | platform_driver_unregister(®ulator_userspace_consumer_driver); | |
195 | } | |
196 | module_exit(regulator_userspace_consumer_exit); | |
197 | ||
198 | MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>"); | |
199 | MODULE_DESCRIPTION("Userspace consumer for voltage and current regulators"); | |
200 | MODULE_LICENSE("GPL"); |