arch/arm/mach-msm/vreg.c

   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
  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
  98 void vreg_put(struct vreg *vreg)
  99 {
 100 }
 101
 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
 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
 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
 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
 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
 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
 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
 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