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  */
24 static int power_state_active_cnt; /* will initialize to zero */
25 static DEFINE_SPINLOCK(power_state_active_lock);
26 
27 void 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(&power_state_active_lock, flags);
34 }
35 
36 int 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--;
49 out:
50 	spin_unlock_irqrestore(&power_state_active_lock, flags);
51 	return ret;
52 }
53 
54 #ifdef CONFIG_REGULATOR_DEBUG
55 
56 static 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(&power_state_active_lock, flags);
64 
65 	return cnt;
66 }
67 
68 static 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 
76 static int ux500_regulator_power_state_cnt_show(struct seq_file *s, void *p)
77 {
78 	/* print power state count */
79 	seq_printf(s, "ux500-regulator power state count: %i\n",
80 		   power_state_active_get());
81 
82 	return 0;
83 }
84 DEFINE_SHOW_ATTRIBUTE(ux500_regulator_power_state_cnt);
85 
86 static int ux500_regulator_status_show(struct seq_file *s, void *p)
87 {
88 	int i;
89 
90 	/* print dump header */
91 	seq_puts(s, "ux500-regulator status:\n");
92 	seq_printf(s, "%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(s, "%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 }
109 DEFINE_SHOW_ATTRIBUTE(ux500_regulator_status);
110 
111 int
112 ux500_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("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 
140 exit_free:
141 	kfree(rdebug.state_before_suspend);
142 exit_destroy_power_state:
143 	debugfs_remove_recursive(rdebug.dir);
144 	return -ENOMEM;
145 }
146 
147 int ux500_regulator_debug_exit(void)
148 {
149 	debugfs_remove_recursive(rdebug.dir);
150 	kfree(rdebug.state_after_suspend);
151 	kfree(rdebug.state_before_suspend);
152 
153 	return 0;
154 }
155 #endif
156