blob: 9af53a66e646269169a8b837a0bdee56a9037a36 (
plain)
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
|
/*
* Copyright (C) 2014 Linaro Ltd
*
* Author: Ulf Hansson <ulf.hansson@linaro.org>
*
* License terms: GNU General Public License (GPL) version 2
*
* MMC power sequence management
*/
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/mmc/host.h>
#include "pwrseq.h"
static DEFINE_MUTEX(pwrseq_list_mutex);
static LIST_HEAD(pwrseq_list);
static struct mmc_pwrseq *of_find_mmc_pwrseq(struct device_node *np)
{
struct mmc_pwrseq *p;
list_for_each_entry(p, &pwrseq_list, list)
if (p->dev->of_node == np)
return p;
return NULL;
}
int mmc_pwrseq_alloc(struct mmc_host *host)
{
struct device_node *np;
struct mmc_pwrseq *pwrseq;
int ret = 0;
np = of_parse_phandle(host->parent->of_node, "mmc-pwrseq", 0);
if (!np)
return 0;
pwrseq = of_find_mmc_pwrseq(np);
if (pwrseq && pwrseq->ops && pwrseq->ops->alloc) {
host->pwrseq = pwrseq;
ret = pwrseq->ops->alloc(host);
if (IS_ERR_VALUE(ret)) {
host->pwrseq = NULL;
goto err;
}
}
pwrseq->users++;
dev_info(host->parent, "allocated mmc-pwrseq\n");
err:
of_node_put(np);
return ret;
}
void mmc_pwrseq_pre_power_on(struct mmc_host *host)
{
struct mmc_pwrseq *pwrseq = host->pwrseq;
if (pwrseq && pwrseq->ops && pwrseq->ops->pre_power_on)
pwrseq->ops->pre_power_on(host);
}
void mmc_pwrseq_post_power_on(struct mmc_host *host)
{
struct mmc_pwrseq *pwrseq = host->pwrseq;
if (pwrseq && pwrseq->ops && pwrseq->ops->post_power_on)
pwrseq->ops->post_power_on(host);
}
void mmc_pwrseq_power_off(struct mmc_host *host)
{
struct mmc_pwrseq *pwrseq = host->pwrseq;
if (pwrseq && pwrseq->ops && pwrseq->ops->power_off)
pwrseq->ops->power_off(host);
}
void mmc_pwrseq_free(struct mmc_host *host)
{
struct mmc_pwrseq *pwrseq = host->pwrseq;
if (pwrseq && pwrseq->ops && pwrseq->ops->free)
pwrseq->ops->free(host);
pwrseq->users--;
host->pwrseq = NULL;
}
int mmc_pwrseq_register(struct mmc_pwrseq *pwrseq)
{
if (!pwrseq || !pwrseq->ops || !pwrseq->dev)
return -EINVAL;
mutex_lock(&pwrseq_list_mutex);
list_add(&pwrseq->list, &pwrseq_list);
mutex_unlock(&pwrseq_list_mutex);
return 0;
}
EXPORT_SYMBOL_GPL(mmc_pwrseq_register);
int mmc_pwrseq_unregister(struct mmc_pwrseq *pwrseq)
{
if (!pwrseq->users) {
mutex_lock(&pwrseq_list_mutex);
list_del(&pwrseq->list);
mutex_unlock(&pwrseq_list_mutex);
return 0;
}
return -EBUSY;
}
EXPORT_SYMBOL_GPL(mmc_pwrseq_unregister);
|
