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	/* print power state count */
 99	seq_printf(s, "ux500-regulator power state count: %i\n",
100		   power_state_active_get());
101
102	return 0;
103}
104
105static int ux500_regulator_power_state_cnt_open(struct inode *inode,
106	struct file *file)
107{
108	return single_open(file, ux500_regulator_power_state_cnt_print,
109		inode->i_private);
110}
111
112static const struct file_operations ux500_regulator_power_state_cnt_fops = {
113	.open = ux500_regulator_power_state_cnt_open,
114	.read = seq_read,
115	.llseek = seq_lseek,
116	.release = single_release,
117	.owner = THIS_MODULE,
118};
119
120static int ux500_regulator_status_print(struct seq_file *s, void *p)
121{
122	int i;
123
124	/* print dump header */
125	seq_puts(s, "ux500-regulator status:\n");
126	seq_printf(s, "%31s : %8s : %8s\n", "current", "before", "after");
127
128	for (i = 0; i < rdebug.num_regulators; i++) {
129		struct dbx500_regulator_info *info;
130		/* Access per-regulator data */
131		info = &rdebug.regulator_array[i];
132
133		/* print status */
134		seq_printf(s, "%20s : %8s : %8s : %8s\n",
135			   info->desc.name,
136			   info->is_enabled ? "enabled" : "disabled",
137			   rdebug.state_before_suspend[i] ? "enabled" : "disabled",
138			   rdebug.state_after_suspend[i] ? "enabled" : "disabled");
139	}
140
141	return 0;
142}
143
144static int ux500_regulator_status_open(struct inode *inode, struct file *file)
145{
146	return single_open(file, ux500_regulator_status_print,
147		inode->i_private);
148}
149
150static const struct file_operations ux500_regulator_status_fops = {
151	.open = ux500_regulator_status_open,
152	.read = seq_read,
153	.llseek = seq_lseek,
154	.release = single_release,
155	.owner = THIS_MODULE,
156};
157
158int __attribute__((weak)) dbx500_regulator_testcase(
159	struct dbx500_regulator_info *regulator_info,
160	int num_regulators)
161{
162	return 0;
163}
164
165int
166ux500_regulator_debug_init(struct platform_device *pdev,
167	struct dbx500_regulator_info *regulator_info,
168	int num_regulators)
169{
170	/* create directory */
171	rdebug.dir = debugfs_create_dir("ux500-regulator", NULL);
172	if (!rdebug.dir)
173		goto exit_no_debugfs;
174
175	/* create "status" file */
176	rdebug.status_file = debugfs_create_file("status",
177		S_IRUGO, rdebug.dir, &pdev->dev,
178		&ux500_regulator_status_fops);
179	if (!rdebug.status_file)
180		goto exit_destroy_dir;
181
182	/* create "power-state-count" file */
183	rdebug.power_state_cnt_file = debugfs_create_file("power-state-count",
184		S_IRUGO, rdebug.dir, &pdev->dev,
185		&ux500_regulator_power_state_cnt_fops);
186	if (!rdebug.power_state_cnt_file)
187		goto exit_destroy_status;
188
189	rdebug.regulator_array = regulator_info;
190	rdebug.num_regulators = num_regulators;
191
192	rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL);
193	if (!rdebug.state_before_suspend)
194		goto exit_destroy_power_state;
195
196	rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL);
197	if (!rdebug.state_after_suspend)
198		goto exit_free;
199
200	dbx500_regulator_testcase(regulator_info, num_regulators);
201	return 0;
202
203exit_free:
204	kfree(rdebug.state_before_suspend);
205exit_destroy_power_state:
206	debugfs_remove(rdebug.power_state_cnt_file);
207exit_destroy_status:
208	debugfs_remove(rdebug.status_file);
209exit_destroy_dir:
210	debugfs_remove(rdebug.dir);
211exit_no_debugfs:
212	dev_err(&pdev->dev, "failed to create debugfs entries.\n");
213	return -ENOMEM;
214}
215
216int ux500_regulator_debug_exit(void)
217{
218	debugfs_remove_recursive(rdebug.dir);
219	kfree(rdebug.state_after_suspend);
220	kfree(rdebug.state_before_suspend);
221
222	return 0;
223}
224#endif