linux/arch/arm/mach-msm/vreg.c

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/* arch/arm/mach-msm/vreg.c
*
* Copyright (C) 2008 Google, Inc.
* Copyright (c) 2009, Code Aurora Forum. All rights reserved.
* Author: Brian Swetland <swetland@google.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/debugfs.h>
#include <linux/string.h>
#include <mach/vreg.h>
#include "proc_comm.h"
struct vreg {
const char *name;
unsigned id;
int status;
unsigned refcnt;
};
#define VREG(_name, _id, _status, _refcnt) \
{ .name = _name, .id = _id, .status = _status, .refcnt = _refcnt }
static struct vreg vregs[] = {
VREG("msma", 0, 0, 0),
VREG("msmp", 1, 0, 0),
VREG("msme1", 2, 0, 0),
VREG("msmc1", 3, 0, 0),
VREG("msmc2", 4, 0, 0),
VREG("gp3", 5, 0, 0),
VREG("msme2", 6, 0, 0),
VREG("gp4", 7, 0, 0),
VREG("gp1", 8, 0, 0),
VREG("tcxo", 9, 0, 0),
VREG("pa", 10, 0, 0),
VREG("rftx", 11, 0, 0),
VREG("rfrx1", 12, 0, 0),
VREG("rfrx2", 13, 0, 0),
VREG("synt", 14, 0, 0),
VREG("wlan", 15, 0, 0),
VREG("usb", 16, 0, 0),
VREG("boost", 17, 0, 0),
VREG("mmc", 18, 0, 0),
VREG("ruim", 19, 0, 0),
VREG("msmc0", 20, 0, 0),
VREG("gp2", 21, 0, 0),
VREG("gp5", 22, 0, 0),
VREG("gp6", 23, 0, 0),
VREG("rf", 24, 0, 0),
VREG("rf_vco", 26, 0, 0),
VREG("mpll", 27, 0, 0),
VREG("s2", 28, 0, 0),
VREG("s3", 29, 0, 0),
VREG("rfubm", 30, 0, 0),
VREG("ncp", 31, 0, 0),
VREG("gp7", 32, 0, 0),
VREG("gp8", 33, 0, 0),
VREG("gp9", 34, 0, 0),
VREG("gp10", 35, 0, 0),
VREG("gp11", 36, 0, 0),
VREG("gp12", 37, 0, 0),
VREG("gp13", 38, 0, 0),
VREG("gp14", 39, 0, 0),
VREG("gp15", 40, 0, 0),
VREG("gp16", 41, 0, 0),
VREG("gp17", 42, 0, 0),
VREG("s4", 43, 0, 0),
VREG("usb2", 44, 0, 0),
VREG("wlan2", 45, 0, 0),
VREG("xo_out", 46, 0, 0),
VREG("lvsw0", 47, 0, 0),
VREG("lvsw1", 48, 0, 0),
};
struct vreg *vreg_get(struct device *dev, const char *id)
{
int n;
for (n = 0; n < ARRAY_SIZE(vregs); n++) {
if (!strcmp(vregs[n].name, id))
return vregs + n;
}
return ERR_PTR(-ENOENT);
}
void vreg_put(struct vreg *vreg)
{
}
int vreg_enable(struct vreg *vreg)
{
unsigned id = vreg->id;
unsigned enable = 1;
if (vreg->refcnt == 0)
vreg->status = msm_proc_comm(PCOM_VREG_SWITCH, &id, &enable);
if ((vreg->refcnt < UINT_MAX) && (!vreg->status))
vreg->refcnt++;
return vreg->status;
}
int vreg_disable(struct vreg *vreg)
{
unsigned id = vreg->id;
unsigned enable = 0;
if (!vreg->refcnt)
return 0;
if (vreg->refcnt == 1)
vreg->status = msm_proc_comm(PCOM_VREG_SWITCH, &id, &enable);
if (!vreg->status)
vreg->refcnt--;
return vreg->status;
}
int vreg_set_level(struct vreg *vreg, unsigned mv)
{
unsigned id = vreg->id;
vreg->status = msm_proc_comm(PCOM_VREG_SET_LEVEL, &id, &mv);
return vreg->status;
}
#if defined(CONFIG_DEBUG_FS)
static int vreg_debug_set(void *data, u64 val)
{
struct vreg *vreg = data;
switch (val) {
case 0:
vreg_disable(vreg);
break;
case 1:
vreg_enable(vreg);
break;
default:
vreg_set_level(vreg, val);
break;
}
return 0;
}
static int vreg_debug_get(void *data, u64 *val)
{
struct vreg *vreg = data;
if (!vreg->status)
*val = 0;
else
*val = 1;
return 0;
}
static int vreg_debug_count_set(void *data, u64 val)
{
struct vreg *vreg = data;
if (val > UINT_MAX)
val = UINT_MAX;
vreg->refcnt = val;
return 0;
}
static int vreg_debug_count_get(void *data, u64 *val)
{
struct vreg *vreg = data;
*val = vreg->refcnt;
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(vreg_fops, vreg_debug_get, vreg_debug_set, "%llu\n");
DEFINE_SIMPLE_ATTRIBUTE(vreg_count_fops, vreg_debug_count_get,
vreg_debug_count_set, "%llu\n");
static int __init vreg_debug_init(void)
{
struct dentry *dent;
int n;
char name[32];
const char *refcnt_name = "_refcnt";
dent = debugfs_create_dir("vreg", 0);
if (IS_ERR(dent))
return 0;
for (n = 0; n < ARRAY_SIZE(vregs); n++) {
(void) debugfs_create_file(vregs[n].name, 0644,
dent, vregs + n, &vreg_fops);
strlcpy(name, vregs[n].name, sizeof(name));
strlcat(name, refcnt_name, sizeof(name));
(void) debugfs_create_file(name, 0644,
dent, vregs + n, &vreg_count_fops);
}
return 0;
}
device_initcall(vreg_debug_init);
#endif