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
 78static int ux500_regulator_power_state_cnt_print(struct seq_file *s, void *p)
 79{
 80	/* print power state count */
 81	seq_printf(s, "ux500-regulator power state count: %i\n",
 82		   power_state_active_get());
 83
 84	return 0;
 85}
 86
 87static int ux500_regulator_power_state_cnt_open(struct inode *inode,
 88	struct file *file)
 89{
 90	return single_open(file, ux500_regulator_power_state_cnt_print,
 91		inode->i_private);
 92}
 93
 94static const struct file_operations ux500_regulator_power_state_cnt_fops = {
 95	.open = ux500_regulator_power_state_cnt_open,
 96	.read = seq_read,
 97	.llseek = seq_lseek,
 98	.release = single_release,
 99	.owner = THIS_MODULE,
100};
101
102static int ux500_regulator_status_print(struct seq_file *s, void *p)
103{
104	int i;
105
106	/* print dump header */
107	seq_puts(s, "ux500-regulator status:\n");
108	seq_printf(s, "%31s : %8s : %8s\n", "current", "before", "after");
109
110	for (i = 0; i < rdebug.num_regulators; i++) {
111		struct dbx500_regulator_info *info;
112		/* Access per-regulator data */
113		info = &rdebug.regulator_array[i];
114
115		/* print status */
116		seq_printf(s, "%20s : %8s : %8s : %8s\n",
117			   info->desc.name,
118			   info->is_enabled ? "enabled" : "disabled",
119			   rdebug.state_before_suspend[i] ? "enabled" : "disabled",
120			   rdebug.state_after_suspend[i] ? "enabled" : "disabled");
121	}
122
123	return 0;
124}
125
126static int ux500_regulator_status_open(struct inode *inode, struct file *file)
127{
128	return single_open(file, ux500_regulator_status_print,
129		inode->i_private);
130}
131
132static const struct file_operations ux500_regulator_status_fops = {
133	.open = ux500_regulator_status_open,
134	.read = seq_read,
135	.llseek = seq_lseek,
136	.release = single_release,
137	.owner = THIS_MODULE,
138};
139
140int __attribute__((weak)) dbx500_regulator_testcase(
141	struct dbx500_regulator_info *regulator_info,
142	int num_regulators)
143{
144	return 0;
145}
146
147int
148ux500_regulator_debug_init(struct platform_device *pdev,
149	struct dbx500_regulator_info *regulator_info,
150	int num_regulators)
151{
152	/* create directory */
153	rdebug.dir = debugfs_create_dir("ux500-regulator", NULL);
154	if (!rdebug.dir)
155		goto exit_no_debugfs;
156
157	/* create "status" file */
158	rdebug.status_file = debugfs_create_file("status",
159		S_IRUGO, rdebug.dir, &pdev->dev,
160		&ux500_regulator_status_fops);
161	if (!rdebug.status_file)
162		goto exit_destroy_dir;
163
164	/* create "power-state-count" file */
165	rdebug.power_state_cnt_file = debugfs_create_file("power-state-count",
166		S_IRUGO, rdebug.dir, &pdev->dev,
167		&ux500_regulator_power_state_cnt_fops);
168	if (!rdebug.power_state_cnt_file)
169		goto exit_destroy_status;
170
171	rdebug.regulator_array = regulator_info;
172	rdebug.num_regulators = num_regulators;
173
174	rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL);
175	if (!rdebug.state_before_suspend)
176		goto exit_destroy_power_state;
177
178	rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL);
179	if (!rdebug.state_after_suspend)
180		goto exit_free;
181
182	dbx500_regulator_testcase(regulator_info, num_regulators);
183	return 0;
184
185exit_free:
186	kfree(rdebug.state_before_suspend);
187exit_destroy_power_state:
188	debugfs_remove(rdebug.power_state_cnt_file);
189exit_destroy_status:
190	debugfs_remove(rdebug.status_file);
191exit_destroy_dir:
192	debugfs_remove(rdebug.dir);
193exit_no_debugfs:
194	dev_err(&pdev->dev, "failed to create debugfs entries.\n");
195	return -ENOMEM;
196}
197
198int ux500_regulator_debug_exit(void)
199{
200	debugfs_remove_recursive(rdebug.dir);
201	kfree(rdebug.state_after_suspend);
202	kfree(rdebug.state_before_suspend);
203
204	return 0;
205}
206#endif