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1/* arch/arm/mach-msm/vreg.c
2 *
3 * Copyright (C) 2008 Google, Inc.
4 * Copyright (c) 2009, Code Aurora Forum. All rights reserved.
5 * Author: Brian Swetland <swetland@google.com>
6 *
7 * This software is licensed under the terms of the GNU General Public
8 * License version 2, as published by the Free Software Foundation, and
9 * may be copied, distributed, and modified under those terms.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 */
17
18#include <linux/kernel.h>
19#include <linux/device.h>
20#include <linux/init.h>
21#include <linux/debugfs.h>
22#include <linux/module.h>
23#include <linux/string.h>
24#include <mach/vreg.h>
25
26#include "proc_comm.h"
27
28struct vreg {
29 const char *name;
30 unsigned id;
31 int status;
32 unsigned refcnt;
33};
34
35#define VREG(_name, _id, _status, _refcnt) \
36 { .name = _name, .id = _id, .status = _status, .refcnt = _refcnt }
37
38static struct vreg vregs[] = {
39 VREG("msma", 0, 0, 0),
40 VREG("msmp", 1, 0, 0),
41 VREG("msme1", 2, 0, 0),
42 VREG("msmc1", 3, 0, 0),
43 VREG("msmc2", 4, 0, 0),
44 VREG("gp3", 5, 0, 0),
45 VREG("msme2", 6, 0, 0),
46 VREG("gp4", 7, 0, 0),
47 VREG("gp1", 8, 0, 0),
48 VREG("tcxo", 9, 0, 0),
49 VREG("pa", 10, 0, 0),
50 VREG("rftx", 11, 0, 0),
51 VREG("rfrx1", 12, 0, 0),
52 VREG("rfrx2", 13, 0, 0),
53 VREG("synt", 14, 0, 0),
54 VREG("wlan", 15, 0, 0),
55 VREG("usb", 16, 0, 0),
56 VREG("boost", 17, 0, 0),
57 VREG("mmc", 18, 0, 0),
58 VREG("ruim", 19, 0, 0),
59 VREG("msmc0", 20, 0, 0),
60 VREG("gp2", 21, 0, 0),
61 VREG("gp5", 22, 0, 0),
62 VREG("gp6", 23, 0, 0),
63 VREG("rf", 24, 0, 0),
64 VREG("rf_vco", 26, 0, 0),
65 VREG("mpll", 27, 0, 0),
66 VREG("s2", 28, 0, 0),
67 VREG("s3", 29, 0, 0),
68 VREG("rfubm", 30, 0, 0),
69 VREG("ncp", 31, 0, 0),
70 VREG("gp7", 32, 0, 0),
71 VREG("gp8", 33, 0, 0),
72 VREG("gp9", 34, 0, 0),
73 VREG("gp10", 35, 0, 0),
74 VREG("gp11", 36, 0, 0),
75 VREG("gp12", 37, 0, 0),
76 VREG("gp13", 38, 0, 0),
77 VREG("gp14", 39, 0, 0),
78 VREG("gp15", 40, 0, 0),
79 VREG("gp16", 41, 0, 0),
80 VREG("gp17", 42, 0, 0),
81 VREG("s4", 43, 0, 0),
82 VREG("usb2", 44, 0, 0),
83 VREG("wlan2", 45, 0, 0),
84 VREG("xo_out", 46, 0, 0),
85 VREG("lvsw0", 47, 0, 0),
86 VREG("lvsw1", 48, 0, 0),
87};
88
89struct vreg *vreg_get(struct device *dev, const char *id)
90{
91 int n;
92 for (n = 0; n < ARRAY_SIZE(vregs); n++) {
93 if (!strcmp(vregs[n].name, id))
94 return vregs + n;
95 }
96 return ERR_PTR(-ENOENT);
97}
98
99void vreg_put(struct vreg *vreg)
100{
101}
102
103int vreg_enable(struct vreg *vreg)
104{
105 unsigned id = vreg->id;
106 unsigned enable = 1;
107
108 if (vreg->refcnt == 0)
109 vreg->status = msm_proc_comm(PCOM_VREG_SWITCH, &id, &enable);
110
111 if ((vreg->refcnt < UINT_MAX) && (!vreg->status))
112 vreg->refcnt++;
113
114 return vreg->status;
115}
116
117int vreg_disable(struct vreg *vreg)
118{
119 unsigned id = vreg->id;
120 unsigned enable = 0;
121
122 if (!vreg->refcnt)
123 return 0;
124
125 if (vreg->refcnt == 1)
126 vreg->status = msm_proc_comm(PCOM_VREG_SWITCH, &id, &enable);
127
128 if (!vreg->status)
129 vreg->refcnt--;
130
131 return vreg->status;
132}
133
134int vreg_set_level(struct vreg *vreg, unsigned mv)
135{
136 unsigned id = vreg->id;
137
138 vreg->status = msm_proc_comm(PCOM_VREG_SET_LEVEL, &id, &mv);
139 return vreg->status;
140}
141
142#if defined(CONFIG_DEBUG_FS)
143
144static int vreg_debug_set(void *data, u64 val)
145{
146 struct vreg *vreg = data;
147 switch (val) {
148 case 0:
149 vreg_disable(vreg);
150 break;
151 case 1:
152 vreg_enable(vreg);
153 break;
154 default:
155 vreg_set_level(vreg, val);
156 break;
157 }
158 return 0;
159}
160
161static int vreg_debug_get(void *data, u64 *val)
162{
163 struct vreg *vreg = data;
164
165 if (!vreg->status)
166 *val = 0;
167 else
168 *val = 1;
169
170 return 0;
171}
172
173static int vreg_debug_count_set(void *data, u64 val)
174{
175 struct vreg *vreg = data;
176 if (val > UINT_MAX)
177 val = UINT_MAX;
178 vreg->refcnt = val;
179 return 0;
180}
181
182static int vreg_debug_count_get(void *data, u64 *val)
183{
184 struct vreg *vreg = data;
185
186 *val = vreg->refcnt;
187
188 return 0;
189}
190
191DEFINE_SIMPLE_ATTRIBUTE(vreg_fops, vreg_debug_get, vreg_debug_set, "%llu\n");
192DEFINE_SIMPLE_ATTRIBUTE(vreg_count_fops, vreg_debug_count_get,
193 vreg_debug_count_set, "%llu\n");
194
195static int __init vreg_debug_init(void)
196{
197 struct dentry *dent;
198 int n;
199 char name[32];
200 const char *refcnt_name = "_refcnt";
201
202 dent = debugfs_create_dir("vreg", 0);
203 if (IS_ERR(dent))
204 return 0;
205
206 for (n = 0; n < ARRAY_SIZE(vregs); n++) {
207 (void) debugfs_create_file(vregs[n].name, 0644,
208 dent, vregs + n, &vreg_fops);
209
210 strlcpy(name, vregs[n].name, sizeof(name));
211 strlcat(name, refcnt_name, sizeof(name));
212 (void) debugfs_create_file(name, 0644,
213 dent, vregs + n, &vreg_count_fops);
214 }
215
216 return 0;
217}
218
219device_initcall(vreg_debug_init);
220#endif