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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 = dev_get_platdata(&pdev->dev); | |
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"); |