1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) ST-Ericsson SA 2010
4 *
5 * Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
6 * Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson
7 *
8 * UX500 common part of Power domain regulators
9 */
10
11#include <linux/kernel.h>
12#include <linux/err.h>
13#include <linux/regulator/driver.h>
14#include <linux/debugfs.h>
15#include <linux/seq_file.h>
16#include <linux/slab.h>
17#include <linux/module.h>
18
19#include "dbx500-prcmu.h"
20
21/*
22 * power state reference count
23 */
24static int power_state_active_cnt; /* will initialize to zero */
25static DEFINE_SPINLOCK(power_state_active_lock);
26
27void power_state_active_enable(void)
28{
29 unsigned long flags;
30
31 spin_lock_irqsave(&power_state_active_lock, flags);
32 power_state_active_cnt++;
33 spin_unlock_irqrestore(lock: &power_state_active_lock, flags);
34}
35
36int power_state_active_disable(void)
37{
38 int ret = 0;
39 unsigned long flags;
40
41 spin_lock_irqsave(&power_state_active_lock, flags);
42 if (power_state_active_cnt <= 0) {
43 pr_err("power state: unbalanced enable/disable calls\n");
44 ret = -EINVAL;
45 goto out;
46 }
47
48 power_state_active_cnt--;
49out:
50 spin_unlock_irqrestore(lock: &power_state_active_lock, flags);
51 return ret;
52}
53
54#ifdef CONFIG_REGULATOR_DEBUG
55
56static int power_state_active_get(void)
57{
58 unsigned long flags;
59 int cnt;
60
61 spin_lock_irqsave(&power_state_active_lock, flags);
62 cnt = power_state_active_cnt;
63 spin_unlock_irqrestore(lock: &power_state_active_lock, flags);
64
65 return cnt;
66}
67
68static struct ux500_regulator_debug {
69 struct dentry *dir;
70 struct dbx500_regulator_info *regulator_array;
71 int num_regulators;
72 u8 *state_before_suspend;
73 u8 *state_after_suspend;
74} rdebug;
75
76static int ux500_regulator_power_state_cnt_show(struct seq_file *s, void *p)
77{
78 /* print power state count */
79 seq_printf(m: s, fmt: "ux500-regulator power state count: %i\n",
80 power_state_active_get());
81
82 return 0;
83}
84DEFINE_SHOW_ATTRIBUTE(ux500_regulator_power_state_cnt);
85
86static int ux500_regulator_status_show(struct seq_file *s, void *p)
87{
88 int i;
89
90 /* print dump header */
91 seq_puts(m: s, s: "ux500-regulator status:\n");
92 seq_printf(m: s, fmt: "%31s : %8s : %8s\n", "current", "before", "after");
93
94 for (i = 0; i < rdebug.num_regulators; i++) {
95 struct dbx500_regulator_info *info;
96 /* Access per-regulator data */
97 info = &rdebug.regulator_array[i];
98
99 /* print status */
100 seq_printf(m: s, fmt: "%20s : %8s : %8s : %8s\n",
101 info->desc.name,
102 info->is_enabled ? "enabled" : "disabled",
103 rdebug.state_before_suspend[i] ? "enabled" : "disabled",
104 rdebug.state_after_suspend[i] ? "enabled" : "disabled");
105 }
106
107 return 0;
108}
109DEFINE_SHOW_ATTRIBUTE(ux500_regulator_status);
110
111int
112ux500_regulator_debug_init(struct platform_device *pdev,
113 struct dbx500_regulator_info *regulator_info,
114 int num_regulators)
115{
116 /* create directory */
117 rdebug.dir = debugfs_create_dir(name: "ux500-regulator", NULL);
118
119 /* create "status" file */
120 debugfs_create_file("status", 0444, rdebug.dir, &pdev->dev,
121 &ux500_regulator_status_fops);
122
123 /* create "power-state-count" file */
124 debugfs_create_file("power-state-count", 0444, rdebug.dir,
125 &pdev->dev, &ux500_regulator_power_state_cnt_fops);
126
127 rdebug.regulator_array = regulator_info;
128 rdebug.num_regulators = num_regulators;
129
130 rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL);
131 if (!rdebug.state_before_suspend)
132 goto exit_destroy_power_state;
133
134 rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL);
135 if (!rdebug.state_after_suspend)
136 goto exit_free;
137
138 return 0;
139
140exit_free:
141 kfree(objp: rdebug.state_before_suspend);
142exit_destroy_power_state:
143 debugfs_remove_recursive(dentry: rdebug.dir);
144 return -ENOMEM;
145}
146
147int ux500_regulator_debug_exit(void)
148{
149 debugfs_remove_recursive(dentry: rdebug.dir);
150 kfree(objp: rdebug.state_after_suspend);
151 kfree(objp: rdebug.state_before_suspend);
152
153 return 0;
154}
155#endif
156

source code of linux/drivers/regulator/dbx500-prcmu.c