1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) ST-Ericsson SA 2010
  4 *
  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 dbx500_regulator_info *regulator_array;
 71	int num_regulators;
 72	u8 *state_before_suspend;
 73	u8 *state_after_suspend;
 74} rdebug;
 75
 76static int ux500_regulator_power_state_cnt_show(struct seq_file *s, void *p)
 77{
 78	/* print power state count */
 79	seq_printf(s, "ux500-regulator power state count: %i\n",
 80		   power_state_active_get());
 81
 82	return 0;
 83}
 84DEFINE_SHOW_ATTRIBUTE(ux500_regulator_power_state_cnt);
 85
 86static int ux500_regulator_status_show(struct seq_file *s, void *p)
 87{
 88	int i;
 89
 90	/* print dump header */
 91	seq_puts(s, "ux500-regulator status:\n");
 92	seq_printf(s, "%31s : %8s : %8s\n", "current", "before", "after");
 93
 94	for (i = 0; i < rdebug.num_regulators; i++) {
 95		struct dbx500_regulator_info *info;
 96		/* Access per-regulator data */
 97		info = &rdebug.regulator_array[i];
 98
 99		/* print status */
100		seq_printf(s, "%20s : %8s : %8s : %8s\n",
101			   info->desc.name,
102			   info->is_enabled ? "enabled" : "disabled",
103			   rdebug.state_before_suspend[i] ? "enabled" : "disabled",
104			   rdebug.state_after_suspend[i] ? "enabled" : "disabled");
105	}
106
107	return 0;
108}
109DEFINE_SHOW_ATTRIBUTE(ux500_regulator_status);
110
111int
112ux500_regulator_debug_init(struct platform_device *pdev,
113	struct dbx500_regulator_info *regulator_info,
114	int num_regulators)
115{
116	/* create directory */
117	rdebug.dir = debugfs_create_dir("ux500-regulator", NULL);
118
119	/* create "status" file */
120	debugfs_create_file("status", 0444, rdebug.dir, &pdev->dev,
121			    &ux500_regulator_status_fops);
122
123	/* create "power-state-count" file */
124	debugfs_create_file("power-state-count", 0444, rdebug.dir,
125			    &pdev->dev, &ux500_regulator_power_state_cnt_fops);
126
127	rdebug.regulator_array = regulator_info;
128	rdebug.num_regulators = num_regulators;
129
130	rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL);
131	if (!rdebug.state_before_suspend)
132		goto exit_destroy_power_state;
133
134	rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL);
135	if (!rdebug.state_after_suspend)
136		goto exit_free;
137
138	return 0;
139
140exit_free:
141	kfree(rdebug.state_before_suspend);
142exit_destroy_power_state:
143	debugfs_remove_recursive(rdebug.dir);
144	return -ENOMEM;
145}
146
147int ux500_regulator_debug_exit(void)
148{
149	debugfs_remove_recursive(rdebug.dir);
150	kfree(rdebug.state_after_suspend);
151	kfree(rdebug.state_before_suspend);
152
153	return 0;
154}
155#endif