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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1d98cccf MR |
2 | /* |
3 | * userspace-consumer.c | |
4 | * | |
5 | * Copyright 2009 CompuLab, Ltd. | |
6 | * | |
7 | * Author: Mike Rapoport <mike@compulab.co.il> | |
8 | * | |
9 | * Based of virtual consumer driver: | |
10 | * Copyright 2008 Wolfson Microelectronics PLC. | |
11 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
1d98cccf MR |
12 | */ |
13 | ||
14 | #include <linux/err.h> | |
15 | #include <linux/mutex.h> | |
65602c32 | 16 | #include <linux/module.h> |
1d98cccf MR |
17 | #include <linux/platform_device.h> |
18 | #include <linux/regulator/consumer.h> | |
19 | #include <linux/regulator/userspace-consumer.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
1d98cccf MR |
21 | |
22 | struct userspace_consumer_data { | |
23 | const char *name; | |
24 | ||
25 | struct mutex lock; | |
26 | bool enabled; | |
27 | ||
28 | int num_supplies; | |
29 | struct regulator_bulk_data *supplies; | |
30 | }; | |
31 | ||
7c314991 | 32 | static ssize_t reg_show_name(struct device *dev, |
1d98cccf MR |
33 | struct device_attribute *attr, char *buf) |
34 | { | |
35 | struct userspace_consumer_data *data = dev_get_drvdata(dev); | |
36 | ||
37 | return sprintf(buf, "%s\n", data->name); | |
38 | } | |
39 | ||
7c314991 | 40 | static ssize_t reg_show_state(struct device *dev, |
1d98cccf MR |
41 | struct device_attribute *attr, char *buf) |
42 | { | |
43 | struct userspace_consumer_data *data = dev_get_drvdata(dev); | |
44 | ||
45 | if (data->enabled) | |
46 | return sprintf(buf, "enabled\n"); | |
47 | ||
48 | return sprintf(buf, "disabled\n"); | |
49 | } | |
50 | ||
7c314991 | 51 | static ssize_t reg_set_state(struct device *dev, struct device_attribute *attr, |
1d98cccf MR |
52 | const char *buf, size_t count) |
53 | { | |
54 | struct userspace_consumer_data *data = dev_get_drvdata(dev); | |
55 | bool enabled; | |
56 | int ret; | |
57 | ||
58 | /* | |
59 | * sysfs_streq() doesn't need the \n's, but we add them so the strings | |
60 | * will be shared with show_state(), above. | |
61 | */ | |
62 | if (sysfs_streq(buf, "enabled\n") || sysfs_streq(buf, "1")) | |
63 | enabled = true; | |
64 | else if (sysfs_streq(buf, "disabled\n") || sysfs_streq(buf, "0")) | |
65 | enabled = false; | |
66 | else { | |
67 | dev_err(dev, "Configuring invalid mode\n"); | |
68 | return count; | |
69 | } | |
70 | ||
71 | mutex_lock(&data->lock); | |
72 | if (enabled != data->enabled) { | |
73 | if (enabled) | |
74 | ret = regulator_bulk_enable(data->num_supplies, | |
75 | data->supplies); | |
76 | else | |
77 | ret = regulator_bulk_disable(data->num_supplies, | |
78 | data->supplies); | |
79 | ||
80 | if (ret == 0) | |
81 | data->enabled = enabled; | |
82 | else | |
83 | dev_err(dev, "Failed to configure state: %d\n", ret); | |
84 | } | |
85 | mutex_unlock(&data->lock); | |
86 | ||
87 | return count; | |
88 | } | |
89 | ||
7c314991 LG |
90 | static DEVICE_ATTR(name, 0444, reg_show_name, NULL); |
91 | static DEVICE_ATTR(state, 0644, reg_show_state, reg_set_state); | |
1d98cccf | 92 | |
e9d62698 FB |
93 | static struct attribute *attributes[] = { |
94 | &dev_attr_name.attr, | |
95 | &dev_attr_state.attr, | |
96 | NULL, | |
97 | }; | |
98 | ||
99 | static const struct attribute_group attr_group = { | |
100 | .attrs = attributes, | |
1d98cccf MR |
101 | }; |
102 | ||
103 | static int regulator_userspace_consumer_probe(struct platform_device *pdev) | |
104 | { | |
105 | struct regulator_userspace_consumer_data *pdata; | |
106 | struct userspace_consumer_data *drvdata; | |
e9d62698 | 107 | int ret; |
1d98cccf | 108 | |
dff91d0b | 109 | pdata = dev_get_platdata(&pdev->dev); |
1d98cccf MR |
110 | if (!pdata) |
111 | return -EINVAL; | |
112 | ||
5abe0c40 AL |
113 | drvdata = devm_kzalloc(&pdev->dev, |
114 | sizeof(struct userspace_consumer_data), | |
115 | GFP_KERNEL); | |
1d98cccf MR |
116 | if (drvdata == NULL) |
117 | return -ENOMEM; | |
118 | ||
119 | drvdata->name = pdata->name; | |
120 | drvdata->num_supplies = pdata->num_supplies; | |
121 | drvdata->supplies = pdata->supplies; | |
122 | ||
123 | mutex_init(&drvdata->lock); | |
124 | ||
5abe0c40 AL |
125 | ret = devm_regulator_bulk_get(&pdev->dev, drvdata->num_supplies, |
126 | drvdata->supplies); | |
1d98cccf MR |
127 | if (ret) { |
128 | dev_err(&pdev->dev, "Failed to get supplies: %d\n", ret); | |
5abe0c40 | 129 | return ret; |
1d98cccf MR |
130 | } |
131 | ||
e9d62698 FB |
132 | ret = sysfs_create_group(&pdev->dev.kobj, &attr_group); |
133 | if (ret != 0) | |
5abe0c40 | 134 | return ret; |
1d98cccf | 135 | |
e9d62698 | 136 | if (pdata->init_on) { |
1d98cccf MR |
137 | ret = regulator_bulk_enable(drvdata->num_supplies, |
138 | drvdata->supplies); | |
e9d62698 FB |
139 | if (ret) { |
140 | dev_err(&pdev->dev, | |
141 | "Failed to set initial state: %d\n", ret); | |
142 | goto err_enable; | |
143 | } | |
1d98cccf MR |
144 | } |
145 | ||
e9d62698 | 146 | drvdata->enabled = pdata->init_on; |
1d98cccf MR |
147 | platform_set_drvdata(pdev, drvdata); |
148 | ||
149 | return 0; | |
150 | ||
e9d62698 FB |
151 | err_enable: |
152 | sysfs_remove_group(&pdev->dev.kobj, &attr_group); | |
1d98cccf | 153 | |
1d98cccf MR |
154 | return ret; |
155 | } | |
156 | ||
157 | static int regulator_userspace_consumer_remove(struct platform_device *pdev) | |
158 | { | |
159 | struct userspace_consumer_data *data = platform_get_drvdata(pdev); | |
1d98cccf | 160 | |
e9d62698 | 161 | sysfs_remove_group(&pdev->dev.kobj, &attr_group); |
1d98cccf MR |
162 | |
163 | if (data->enabled) | |
164 | regulator_bulk_disable(data->num_supplies, data->supplies); | |
165 | ||
1d98cccf MR |
166 | return 0; |
167 | } | |
168 | ||
169 | static struct platform_driver regulator_userspace_consumer_driver = { | |
170 | .probe = regulator_userspace_consumer_probe, | |
171 | .remove = regulator_userspace_consumer_remove, | |
172 | .driver = { | |
173 | .name = "reg-userspace-consumer", | |
174 | }, | |
175 | }; | |
176 | ||
005d610f | 177 | module_platform_driver(regulator_userspace_consumer_driver); |
1d98cccf MR |
178 | |
179 | MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>"); | |
180 | MODULE_DESCRIPTION("Userspace consumer for voltage and current regulators"); | |
181 | MODULE_LICENSE("GPL"); |