1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
/*
* Google LWIS Regulator Interface
*
* Copyright (c) 2018 Google, LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#define pr_fmt(fmt) KBUILD_MODNAME "-reg: " fmt
#include <linux/kernel.h>
#include <linux/slab.h>
#include "lwis_regulator.h"
struct lwis_regulator_list *lwis_regulator_list_alloc(int num_regs)
{
struct lwis_regulator_list *list;
if (num_regs < 0) {
return ERR_PTR(-EINVAL);
}
list = kmalloc(sizeof(struct lwis_regulator_list), GFP_KERNEL);
if (!list) {
return ERR_PTR(-ENOMEM);
}
list->reg = kzalloc(num_regs * sizeof(struct lwis_regulator), GFP_KERNEL);
if (!list->reg) {
kfree(list);
return ERR_PTR(-ENOMEM);
}
list->count = num_regs;
return list;
}
void lwis_regulator_list_free(struct lwis_regulator_list *list)
{
if (!list) {
return;
}
if (list->reg) {
kfree(list->reg);
}
kfree(list);
}
int lwis_regulator_get(struct lwis_regulator_list *list, char *name, int voltage,
struct device *dev)
{
struct regulator *reg;
int i;
int index = -1;
if (!list || !dev) {
return -EINVAL;
}
/* Look for empty slot and duplicate entries */
for (i = 0; i < list->count; ++i) {
if (list->reg[i].reg == NULL) {
index = i;
} else if (!strcmp(list->reg[i].name, name)) {
pr_info("Regulator %s already allocated\n", name);
return i;
}
}
/* No empty slot */
if (index < 0) {
pr_err("No empty slots in the lwis_regulator struct\n");
return -ENOMEM;
}
/* Make sure regulator exists */
reg = devm_regulator_get(dev, name);
if (IS_ERR(reg)) {
return PTR_ERR(reg);
}
list->reg[index].reg = reg;
strlcpy(list->reg[index].name, name, LWIS_MAX_NAME_STRING_LEN);
list->reg[index].voltage = voltage;
return index;
}
int lwis_regulator_put_by_idx(struct lwis_regulator_list *list, int index)
{
if (!list || index < 0 || index >= list->count) {
return -EINVAL;
}
if (IS_ERR_OR_NULL(list->reg[index].reg)) {
return -EINVAL;
}
devm_regulator_put(list->reg[index].reg);
memset(list->reg + index, 0, sizeof(struct lwis_regulator));
return 0;
}
int lwis_regulator_put_by_name(struct lwis_regulator_list *list, char *name)
{
int i;
if (!list) {
return -EINVAL;
}
/* Find entry by name */
for (i = 0; i < list->count; ++i) {
if (!strcmp(list->reg[i].name, name)) {
if (IS_ERR_OR_NULL(list->reg[i].reg)) {
return -EINVAL;
}
devm_regulator_put(list->reg[i].reg);
memset(list->reg + i, 0, sizeof(struct lwis_regulator));
return 0;
}
}
pr_err("Regulator %s not found\n", name);
return -EINVAL;
}
int lwis_regulator_put_all(struct lwis_regulator_list *list)
{
int i;
int ret;
if (!list) {
return -EINVAL;
}
for (i = 0; i < list->count; ++i) {
ret = lwis_regulator_put_by_idx(list, i);
}
return ret;
}
int lwis_regulator_enable_by_idx(struct lwis_regulator_list *list, int index)
{
int ret = 0;
struct lwis_regulator *lwis_reg;
if (!list) {
return -EINVAL;
}
lwis_reg = &list->reg[index];
if (lwis_reg->voltage > 0) {
ret = regulator_set_voltage(lwis_reg->reg, lwis_reg->voltage, lwis_reg->voltage);
if (ret) {
pr_err("Failed to set regulator %s voltage to %d\n", lwis_reg->name,
lwis_reg->voltage);
return ret;
}
}
return regulator_enable(list->reg[index].reg);
}
int lwis_regulator_enable_by_name(struct lwis_regulator_list *list, char *name)
{
int i;
if (!list) {
return -EINVAL;
}
for (i = 0; i < list->count; ++i) {
if (!strcmp(list->reg[i].name, name)) {
return lwis_regulator_enable_by_idx(list, i);
}
}
/* No entry found */
pr_err("Regulator %s not found\n", name);
return -ENOENT;
}
int lwis_regulator_enable_all(struct lwis_regulator_list *list)
{
int i;
int ret;
for (i = 0; i < list->count; ++i) {
ret = lwis_regulator_enable_by_idx(list, i);
if (ret) {
pr_err("Error enabling regulator %s\n", list->reg[i].name);
return ret;
}
}
return 0;
}
int lwis_regulator_disable_by_idx(struct lwis_regulator_list *list, int index)
{
if (!list) {
return -EINVAL;
}
return regulator_disable(list->reg[index].reg);
}
int lwis_regulator_disable_by_name(struct lwis_regulator_list *list, char *name)
{
int i;
if (!list) {
return -EINVAL;
}
for (i = 0; i < list->count; ++i) {
if (!strcmp(list->reg[i].name, name)) {
return regulator_disable(list->reg[i].reg);
}
}
/* No entry found */
pr_err("Regulator %s not found\n", name);
return -ENOENT;
}
int lwis_regulator_disable_all(struct lwis_regulator_list *list)
{
int i;
int ret;
for (i = 0; i < list->count; ++i) {
ret = lwis_regulator_disable_by_idx(list, i);
if (ret) {
pr_err("Error disabling regulator %s\n", list->reg[i].name);
return ret;
}
}
return 0;
}
void lwis_regulator_print(struct lwis_regulator_list *list)
{
int i;
for (i = 0; i < list->count; ++i) {
pr_info("%s: reg: %s voltage: %d\n", __func__, list->reg[i].name,
list->reg[i].voltage);
}
}
|
