1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
4 * License Terms: GNU General Public License v2
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(&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(&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(&power_state_active_lock, flags);
64
65	return cnt;
66}
67
68static struct ux500_regulator_debug {
69	struct dentry *dir;
70	struct dentry *status_file;
71	struct dentry *power_state_cnt_file;
72	struct dbx500_regulator_info *regulator_array;
73	int num_regulators;
74	u8 *state_before_suspend;
75	u8 *state_after_suspend;
76} rdebug;
77
78void ux500_regulator_suspend_debug(void)
79{
80	int i;
81
82	for (i = 0; i < rdebug.num_regulators; i++)
83		rdebug.state_before_suspend[i] =
84			rdebug.regulator_array[i].is_enabled;
85}
86
87void ux500_regulator_resume_debug(void)
88{
89	int i;
90
91	for (i = 0; i < rdebug.num_regulators; i++)
92		rdebug.state_after_suspend[i] =
93			rdebug.regulator_array[i].is_enabled;
94}
95
96static int ux500_regulator_power_state_cnt_print(struct seq_file *s, void *p)
97{
98	struct device *dev = s->private;
99	int err;
100
101	/* print power state count */
102	err = seq_printf(s, "ux500-regulator power state count: %i\n",
103		power_state_active_get());
104	if (err < 0)
105		dev_err(dev, "seq_printf overflow\n");
106
107	return 0;
108}
109
110static int ux500_regulator_power_state_cnt_open(struct inode *inode,
111	struct file *file)
112{
113	return single_open(file, ux500_regulator_power_state_cnt_print,
114		inode->i_private);
115}
116
117static const struct file_operations ux500_regulator_power_state_cnt_fops = {
118	.open = ux500_regulator_power_state_cnt_open,
119	.read = seq_read,
120	.llseek = seq_lseek,
121	.release = single_release,
122	.owner = THIS_MODULE,
123};
124
125static int ux500_regulator_status_print(struct seq_file *s, void *p)
126{
127	struct device *dev = s->private;
128	int err;
129	int i;
130
131	/* print dump header */
132	err = seq_puts(s, "ux500-regulator status:\n");
133	if (err < 0)
134		dev_err(dev, "seq_puts overflow\n");
135
136	err = seq_printf(s, "%31s : %8s : %8s\n", "current",
137		"before", "after");
138	if (err < 0)
139		dev_err(dev, "seq_printf overflow\n");
140
141	for (i = 0; i < rdebug.num_regulators; i++) {
142		struct dbx500_regulator_info *info;
143		/* Access per-regulator data */
144		info = &rdebug.regulator_array[i];
145
146		/* print status */
147		err = seq_printf(s, "%20s : %8s : %8s : %8s\n", info->desc.name,
148			info->is_enabled ? "enabled" : "disabled",
149			rdebug.state_before_suspend[i] ? "enabled" : "disabled",
150			rdebug.state_after_suspend[i] ? "enabled" : "disabled");
151		if (err < 0)
152			dev_err(dev, "seq_printf overflow\n");
153	}
154
155	return 0;
156}
157
158static int ux500_regulator_status_open(struct inode *inode, struct file *file)
159{
160	return single_open(file, ux500_regulator_status_print,
161		inode->i_private);
162}
163
164static const struct file_operations ux500_regulator_status_fops = {
165	.open = ux500_regulator_status_open,
166	.read = seq_read,
167	.llseek = seq_lseek,
168	.release = single_release,
169	.owner = THIS_MODULE,
170};
171
172int __attribute__((weak)) dbx500_regulator_testcase(
173	struct dbx500_regulator_info *regulator_info,
174	int num_regulators)
175{
176	return 0;
177}
178
179int
180ux500_regulator_debug_init(struct platform_device *pdev,
181	struct dbx500_regulator_info *regulator_info,
182	int num_regulators)
183{
184	/* create directory */
185	rdebug.dir = debugfs_create_dir("ux500-regulator", NULL);
186	if (!rdebug.dir)
187		goto exit_no_debugfs;
188
189	/* create "status" file */
190	rdebug.status_file = debugfs_create_file("status",
191		S_IRUGO, rdebug.dir, &pdev->dev,
192		&ux500_regulator_status_fops);
193	if (!rdebug.status_file)
194		goto exit_destroy_dir;
195
196	/* create "power-state-count" file */
197	rdebug.power_state_cnt_file = debugfs_create_file("power-state-count",
198		S_IRUGO, rdebug.dir, &pdev->dev,
199		&ux500_regulator_power_state_cnt_fops);
200	if (!rdebug.power_state_cnt_file)
201		goto exit_destroy_status;
202
203	rdebug.regulator_array = regulator_info;
204	rdebug.num_regulators = num_regulators;
205
206	rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL);
207	if (!rdebug.state_before_suspend)
208		goto exit_destroy_power_state;
209
210	rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL);
211	if (!rdebug.state_after_suspend)
212		goto exit_free;
213
214	dbx500_regulator_testcase(regulator_info, num_regulators);
215	return 0;
216
217exit_free:
218	kfree(rdebug.state_before_suspend);
219exit_destroy_power_state:
220	debugfs_remove(rdebug.power_state_cnt_file);
221exit_destroy_status:
222	debugfs_remove(rdebug.status_file);
223exit_destroy_dir:
224	debugfs_remove(rdebug.dir);
225exit_no_debugfs:
226	dev_err(&pdev->dev, "failed to create debugfs entries.\n");
227	return -ENOMEM;
228}
229
230int ux500_regulator_debug_exit(void)
231{
232	debugfs_remove_recursive(rdebug.dir);
233	kfree(rdebug.state_after_suspend);
234	kfree(rdebug.state_before_suspend);
235
236	return 0;
237}
238#endif
239