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/string.h>
23 #include <mach/vreg.h>
24
25 #include "proc_comm.h"
26
27 struct vreg {
28 const char *name;
29 unsigned id;
30 int status;
31 unsigned refcnt;
32 };
33
34 #define VREG(_name, _id, _status, _refcnt) \
35 { .name = _name, .id = _id, .status = _status, .refcnt = _refcnt }
36
37 static struct vreg vregs[] = {
38 VREG("msma", 0, 0, 0),
39 VREG("msmp", 1, 0, 0),
40 VREG("msme1", 2, 0, 0),
41 VREG("msmc1", 3, 0, 0),
42 VREG("msmc2", 4, 0, 0),
43 VREG("gp3", 5, 0, 0),
44 VREG("msme2", 6, 0, 0),
45 VREG("gp4", 7, 0, 0),
46 VREG("gp1", 8, 0, 0),
47 VREG("tcxo", 9, 0, 0),
48 VREG("pa", 10, 0, 0),
49 VREG("rftx", 11, 0, 0),
50 VREG("rfrx1", 12, 0, 0),
51 VREG("rfrx2", 13, 0, 0),
52 VREG("synt", 14, 0, 0),
53 VREG("wlan", 15, 0, 0),
54 VREG("usb", 16, 0, 0),
55 VREG("boost", 17, 0, 0),
56 VREG("mmc", 18, 0, 0),
57 VREG("ruim", 19, 0, 0),
58 VREG("msmc0", 20, 0, 0),
59 VREG("gp2", 21, 0, 0),
60 VREG("gp5", 22, 0, 0),
61 VREG("gp6", 23, 0, 0),
62 VREG("rf", 24, 0, 0),
63 VREG("rf_vco", 26, 0, 0),
64 VREG("mpll", 27, 0, 0),
65 VREG("s2", 28, 0, 0),
66 VREG("s3", 29, 0, 0),
67 VREG("rfubm", 30, 0, 0),
68 VREG("ncp", 31, 0, 0),
69 VREG("gp7", 32, 0, 0),
70 VREG("gp8", 33, 0, 0),
71 VREG("gp9", 34, 0, 0),
72 VREG("gp10", 35, 0, 0),
73 VREG("gp11", 36, 0, 0),
74 VREG("gp12", 37, 0, 0),
75 VREG("gp13", 38, 0, 0),
76 VREG("gp14", 39, 0, 0),
77 VREG("gp15", 40, 0, 0),
78 VREG("gp16", 41, 0, 0),
79 VREG("gp17", 42, 0, 0),
80 VREG("s4", 43, 0, 0),
81 VREG("usb2", 44, 0, 0),
82 VREG("wlan2", 45, 0, 0),
83 VREG("xo_out", 46, 0, 0),
84 VREG("lvsw0", 47, 0, 0),
85 VREG("lvsw1", 48, 0, 0),
86 };
87
vreg_get(struct device * dev,const char * id)88 struct vreg *vreg_get(struct device *dev, const char *id)
89 {
90 int n;
91 for (n = 0; n < ARRAY_SIZE(vregs); n++) {
92 if (!strcmp(vregs[n].name, id))
93 return vregs + n;
94 }
95 return ERR_PTR(-ENOENT);
96 }
97
vreg_put(struct vreg * vreg)98 void vreg_put(struct vreg *vreg)
99 {
100 }
101
vreg_enable(struct vreg * vreg)102 int vreg_enable(struct vreg *vreg)
103 {
104 unsigned id = vreg->id;
105 unsigned enable = 1;
106
107 if (vreg->refcnt == 0)
108 vreg->status = msm_proc_comm(PCOM_VREG_SWITCH, &id, &enable);
109
110 if ((vreg->refcnt < UINT_MAX) && (!vreg->status))
111 vreg->refcnt++;
112
113 return vreg->status;
114 }
115
vreg_disable(struct vreg * vreg)116 int vreg_disable(struct vreg *vreg)
117 {
118 unsigned id = vreg->id;
119 unsigned enable = 0;
120
121 if (!vreg->refcnt)
122 return 0;
123
124 if (vreg->refcnt == 1)
125 vreg->status = msm_proc_comm(PCOM_VREG_SWITCH, &id, &enable);
126
127 if (!vreg->status)
128 vreg->refcnt--;
129
130 return vreg->status;
131 }
132
vreg_set_level(struct vreg * vreg,unsigned mv)133 int vreg_set_level(struct vreg *vreg, unsigned mv)
134 {
135 unsigned id = vreg->id;
136
137 vreg->status = msm_proc_comm(PCOM_VREG_SET_LEVEL, &id, &mv);
138 return vreg->status;
139 }
140
141 #if defined(CONFIG_DEBUG_FS)
142
vreg_debug_set(void * data,u64 val)143 static int vreg_debug_set(void *data, u64 val)
144 {
145 struct vreg *vreg = data;
146 switch (val) {
147 case 0:
148 vreg_disable(vreg);
149 break;
150 case 1:
151 vreg_enable(vreg);
152 break;
153 default:
154 vreg_set_level(vreg, val);
155 break;
156 }
157 return 0;
158 }
159
vreg_debug_get(void * data,u64 * val)160 static int vreg_debug_get(void *data, u64 *val)
161 {
162 struct vreg *vreg = data;
163
164 if (!vreg->status)
165 *val = 0;
166 else
167 *val = 1;
168
169 return 0;
170 }
171
vreg_debug_count_set(void * data,u64 val)172 static int vreg_debug_count_set(void *data, u64 val)
173 {
174 struct vreg *vreg = data;
175 if (val > UINT_MAX)
176 val = UINT_MAX;
177 vreg->refcnt = val;
178 return 0;
179 }
180
vreg_debug_count_get(void * data,u64 * val)181 static int vreg_debug_count_get(void *data, u64 *val)
182 {
183 struct vreg *vreg = data;
184
185 *val = vreg->refcnt;
186
187 return 0;
188 }
189
190 DEFINE_SIMPLE_ATTRIBUTE(vreg_fops, vreg_debug_get, vreg_debug_set, "%llu\n");
191 DEFINE_SIMPLE_ATTRIBUTE(vreg_count_fops, vreg_debug_count_get,
192 vreg_debug_count_set, "%llu\n");
193
vreg_debug_init(void)194 static int __init vreg_debug_init(void)
195 {
196 struct dentry *dent;
197 int n;
198 char name[32];
199 const char *refcnt_name = "_refcnt";
200
201 dent = debugfs_create_dir("vreg", 0);
202 if (IS_ERR(dent))
203 return 0;
204
205 for (n = 0; n < ARRAY_SIZE(vregs); n++) {
206 (void) debugfs_create_file(vregs[n].name, 0644,
207 dent, vregs + n, &vreg_fops);
208
209 strlcpy(name, vregs[n].name, sizeof(name));
210 strlcat(name, refcnt_name, sizeof(name));
211 (void) debugfs_create_file(name, 0644,
212 dent, vregs + n, &vreg_count_fops);
213 }
214
215 return 0;
216 }
217
218 device_initcall(vreg_debug_init);
219 #endif
220