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Bengt Jonsson38e96832012-01-13 16:30:31 +01001/*
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>
Steven Rostedt7f46d0f2013-01-24 10:29:26 -050017#include <linux/module.h>
Bengt Jonsson38e96832012-01-13 16:30:31 +010018
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
27int power_state_active_get(void)
28{
29 unsigned long flags;
30 int cnt;
31
32 spin_lock_irqsave(&power_state_active_lock, flags);
33 cnt = power_state_active_cnt;
34 spin_unlock_irqrestore(&power_state_active_lock, flags);
35
36 return cnt;
37}
38
39void power_state_active_enable(void)
40{
41 unsigned long flags;
42
43 spin_lock_irqsave(&power_state_active_lock, flags);
44 power_state_active_cnt++;
45 spin_unlock_irqrestore(&power_state_active_lock, flags);
46}
47
48int power_state_active_disable(void)
49{
50 int ret = 0;
51 unsigned long flags;
52
53 spin_lock_irqsave(&power_state_active_lock, flags);
54 if (power_state_active_cnt <= 0) {
55 pr_err("power state: unbalanced enable/disable calls\n");
56 ret = -EINVAL;
57 goto out;
58 }
59
60 power_state_active_cnt--;
61out:
62 spin_unlock_irqrestore(&power_state_active_lock, flags);
63 return ret;
64}
65
66#ifdef CONFIG_REGULATOR_DEBUG
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 for (i = 0; i < rdebug.num_regulators; i++)
82 rdebug.state_before_suspend[i] =
83 rdebug.regulator_array[i].is_enabled;
84}
85
86void ux500_regulator_resume_debug(void)
87{
88 int i;
89 for (i = 0; i < rdebug.num_regulators; i++)
90 rdebug.state_after_suspend[i] =
91 rdebug.regulator_array[i].is_enabled;
92}
93
94static int ux500_regulator_power_state_cnt_print(struct seq_file *s, void *p)
95{
96 struct device *dev = s->private;
97 int err;
98
99 /* print power state count */
100 err = seq_printf(s, "ux500-regulator power state count: %i\n",
101 power_state_active_get());
102 if (err < 0)
103 dev_err(dev, "seq_printf overflow\n");
104
105 return 0;
106}
107
108static int ux500_regulator_power_state_cnt_open(struct inode *inode,
109 struct file *file)
110{
111 return single_open(file, ux500_regulator_power_state_cnt_print,
112 inode->i_private);
113}
114
115static const struct file_operations ux500_regulator_power_state_cnt_fops = {
116 .open = ux500_regulator_power_state_cnt_open,
117 .read = seq_read,
118 .llseek = seq_lseek,
119 .release = single_release,
120 .owner = THIS_MODULE,
121};
122
123static int ux500_regulator_status_print(struct seq_file *s, void *p)
124{
125 struct device *dev = s->private;
126 int err;
127 int i;
128
129 /* print dump header */
130 err = seq_printf(s, "ux500-regulator status:\n");
131 if (err < 0)
132 dev_err(dev, "seq_printf overflow\n");
133
134 err = seq_printf(s, "%31s : %8s : %8s\n", "current",
135 "before", "after");
136 if (err < 0)
137 dev_err(dev, "seq_printf overflow\n");
138
139 for (i = 0; i < rdebug.num_regulators; i++) {
140 struct dbx500_regulator_info *info;
141 /* Access per-regulator data */
142 info = &rdebug.regulator_array[i];
143
144 /* print status */
145 err = seq_printf(s, "%20s : %8s : %8s : %8s\n", info->desc.name,
146 info->is_enabled ? "enabled" : "disabled",
147 rdebug.state_before_suspend[i] ? "enabled" : "disabled",
148 rdebug.state_after_suspend[i] ? "enabled" : "disabled");
149 if (err < 0)
150 dev_err(dev, "seq_printf overflow\n");
151 }
152
153 return 0;
154}
155
156static int ux500_regulator_status_open(struct inode *inode, struct file *file)
157{
158 return single_open(file, ux500_regulator_status_print,
159 inode->i_private);
160}
161
162static const struct file_operations ux500_regulator_status_fops = {
163 .open = ux500_regulator_status_open,
164 .read = seq_read,
165 .llseek = seq_lseek,
166 .release = single_release,
167 .owner = THIS_MODULE,
168};
169
170int __attribute__((weak)) dbx500_regulator_testcase(
171 struct dbx500_regulator_info *regulator_info,
172 int num_regulators)
173{
174 return 0;
175}
176
Bill Pembertona5023572012-11-19 13:22:22 -0500177int
Bengt Jonsson38e96832012-01-13 16:30:31 +0100178ux500_regulator_debug_init(struct platform_device *pdev,
179 struct dbx500_regulator_info *regulator_info,
180 int num_regulators)
181{
182 /* create directory */
183 rdebug.dir = debugfs_create_dir("ux500-regulator", NULL);
184 if (!rdebug.dir)
185 goto exit_no_debugfs;
186
187 /* create "status" file */
188 rdebug.status_file = debugfs_create_file("status",
189 S_IRUGO, rdebug.dir, &pdev->dev,
190 &ux500_regulator_status_fops);
191 if (!rdebug.status_file)
192 goto exit_destroy_dir;
193
194 /* create "power-state-count" file */
195 rdebug.power_state_cnt_file = debugfs_create_file("power-state-count",
196 S_IRUGO, rdebug.dir, &pdev->dev,
197 &ux500_regulator_power_state_cnt_fops);
198 if (!rdebug.power_state_cnt_file)
199 goto exit_destroy_status;
200
201 rdebug.regulator_array = regulator_info;
202 rdebug.num_regulators = num_regulators;
203
204 rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL);
205 if (!rdebug.state_before_suspend) {
206 dev_err(&pdev->dev,
207 "could not allocate memory for saving state\n");
208 goto exit_destroy_power_state;
209 }
210
211 rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL);
212 if (!rdebug.state_after_suspend) {
213 dev_err(&pdev->dev,
214 "could not allocate memory for saving state\n");
215 goto exit_free;
216 }
217
218 dbx500_regulator_testcase(regulator_info, num_regulators);
219 return 0;
220
221exit_free:
222 kfree(rdebug.state_before_suspend);
223exit_destroy_power_state:
224 debugfs_remove(rdebug.power_state_cnt_file);
225exit_destroy_status:
226 debugfs_remove(rdebug.status_file);
227exit_destroy_dir:
228 debugfs_remove(rdebug.dir);
229exit_no_debugfs:
230 dev_err(&pdev->dev, "failed to create debugfs entries.\n");
231 return -ENOMEM;
232}
233
Bill Pemberton8dc995f2012-11-19 13:26:10 -0500234int ux500_regulator_debug_exit(void)
Bengt Jonsson38e96832012-01-13 16:30:31 +0100235{
236 debugfs_remove_recursive(rdebug.dir);
237 kfree(rdebug.state_after_suspend);
238 kfree(rdebug.state_before_suspend);
239
240 return 0;
241}
242#endif