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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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