summaryrefslogtreecommitdiff
path: root/drivers/regulator/dbx500-prcmu.c
blob: f111dfb8d2d795c89a67e08b8fbf9c10f4ac140c (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
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * License Terms: GNU General Public License v2
 * Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
 *          Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson
 *
 * UX500 common part of Power domain regulators
 */

#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/regulator/driver.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/module.h>

#include "dbx500-prcmu.h"

/*
 * power state reference count
 */
static int power_state_active_cnt; /* will initialize to zero */
static DEFINE_SPINLOCK(power_state_active_lock);

void power_state_active_enable(void)
{
	unsigned long flags;

	spin_lock_irqsave(&power_state_active_lock, flags);
	power_state_active_cnt++;
	spin_unlock_irqrestore(&power_state_active_lock, flags);
}

int power_state_active_disable(void)
{
	int ret = 0;
	unsigned long flags;

	spin_lock_irqsave(&power_state_active_lock, flags);
	if (power_state_active_cnt <= 0) {
		pr_err("power state: unbalanced enable/disable calls\n");
		ret = -EINVAL;
		goto out;
	}

	power_state_active_cnt--;
out:
	spin_unlock_irqrestore(&power_state_active_lock, flags);
	return ret;
}

#ifdef CONFIG_REGULATOR_DEBUG

static int power_state_active_get(void)
{
	unsigned long flags;
	int cnt;

	spin_lock_irqsave(&power_state_active_lock, flags);
	cnt = power_state_active_cnt;
	spin_unlock_irqrestore(&power_state_active_lock, flags);

	return cnt;
}

static struct ux500_regulator_debug {
	struct dentry *dir;
	struct dentry *status_file;
	struct dentry *power_state_cnt_file;
	struct dbx500_regulator_info *regulator_array;
	int num_regulators;
	u8 *state_before_suspend;
	u8 *state_after_suspend;
} rdebug;

void ux500_regulator_suspend_debug(void)
{
	int i;
	for (i = 0; i < rdebug.num_regulators; i++)
		rdebug.state_before_suspend[i] =
			rdebug.regulator_array[i].is_enabled;
}

void ux500_regulator_resume_debug(void)
{
	int i;
	for (i = 0; i < rdebug.num_regulators; i++)
		rdebug.state_after_suspend[i] =
			rdebug.regulator_array[i].is_enabled;
}

static int ux500_regulator_power_state_cnt_print(struct seq_file *s, void *p)
{
	struct device *dev = s->private;
	int err;

	/* print power state count */
	err = seq_printf(s, "ux500-regulator power state count: %i\n",
		power_state_active_get());
	if (err < 0)
		dev_err(dev, "seq_printf overflow\n");

	return 0;
}

static int ux500_regulator_power_state_cnt_open(struct inode *inode,
	struct file *file)
{
	return single_open(file, ux500_regulator_power_state_cnt_print,
		inode->i_private);
}

static const struct file_operations ux500_regulator_power_state_cnt_fops = {
	.open = ux500_regulator_power_state_cnt_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

static int ux500_regulator_status_print(struct seq_file *s, void *p)
{
	struct device *dev = s->private;
	int err;
	int i;

	/* print dump header */
	err = seq_printf(s, "ux500-regulator status:\n");
	if (err < 0)
		dev_err(dev, "seq_printf overflow\n");

	err = seq_printf(s, "%31s : %8s : %8s\n", "current",
		"before", "after");
	if (err < 0)
		dev_err(dev, "seq_printf overflow\n");

	for (i = 0; i < rdebug.num_regulators; i++) {
		struct dbx500_regulator_info *info;
		/* Access per-regulator data */
		info = &rdebug.regulator_array[i];

		/* print status */
		err = seq_printf(s, "%20s : %8s : %8s : %8s\n", info->desc.name,
			info->is_enabled ? "enabled" : "disabled",
			rdebug.state_before_suspend[i] ? "enabled" : "disabled",
			rdebug.state_after_suspend[i] ? "enabled" : "disabled");
		if (err < 0)
			dev_err(dev, "seq_printf overflow\n");
	}

	return 0;
}

static int ux500_regulator_status_open(struct inode *inode, struct file *file)
{
	return single_open(file, ux500_regulator_status_print,
		inode->i_private);
}

static const struct file_operations ux500_regulator_status_fops = {
	.open = ux500_regulator_status_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

int __attribute__((weak)) dbx500_regulator_testcase(
	struct dbx500_regulator_info *regulator_info,
	int num_regulators)
{
	return 0;
}

int
ux500_regulator_debug_init(struct platform_device *pdev,
	struct dbx500_regulator_info *regulator_info,
	int num_regulators)
{
	/* create directory */
	rdebug.dir = debugfs_create_dir("ux500-regulator", NULL);
	if (!rdebug.dir)
		goto exit_no_debugfs;

	/* create "status" file */
	rdebug.status_file = debugfs_create_file("status",
		S_IRUGO, rdebug.dir, &pdev->dev,
		&ux500_regulator_status_fops);
	if (!rdebug.status_file)
		goto exit_destroy_dir;

	/* create "power-state-count" file */
	rdebug.power_state_cnt_file = debugfs_create_file("power-state-count",
		S_IRUGO, rdebug.dir, &pdev->dev,
		&ux500_regulator_power_state_cnt_fops);
	if (!rdebug.power_state_cnt_file)
		goto exit_destroy_status;

	rdebug.regulator_array = regulator_info;
	rdebug.num_regulators = num_regulators;

	rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL);
	if (!rdebug.state_before_suspend)
		goto exit_destroy_power_state;

	rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL);
	if (!rdebug.state_after_suspend)
		goto exit_free;

	dbx500_regulator_testcase(regulator_info, num_regulators);
	return 0;

exit_free:
	kfree(rdebug.state_before_suspend);
exit_destroy_power_state:
	debugfs_remove(rdebug.power_state_cnt_file);
exit_destroy_status:
	debugfs_remove(rdebug.status_file);
exit_destroy_dir:
	debugfs_remove(rdebug.dir);
exit_no_debugfs:
	dev_err(&pdev->dev, "failed to create debugfs entries.\n");
	return -ENOMEM;
}

int ux500_regulator_debug_exit(void)
{
	debugfs_remove_recursive(rdebug.dir);
	kfree(rdebug.state_after_suspend);
	kfree(rdebug.state_before_suspend);

	return 0;
}
#endif