[mirror_ubuntu-hirsute-kernel.git] / drivers / regulator / dbx500-prcmu.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
 *          Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson
 *
 * UX500 common part of Power domain regulators
 */

#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/regulator/driver.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/module.h>

#include "dbx500-prcmu.h"

/*
 * power state reference count
 */
static int power_state_active_cnt; /* will initialize to zero */
static DEFINE_SPINLOCK(power_state_active_lock);

void power_state_active_enable(void)
{
	unsigned long flags;

	spin_lock_irqsave(&power_state_active_lock, flags);
	power_state_active_cnt++;
	spin_unlock_irqrestore(&power_state_active_lock, flags);
}

int power_state_active_disable(void)
{
	int ret = 0;
	unsigned long flags;

	spin_lock_irqsave(&power_state_active_lock, flags);
	if (power_state_active_cnt <= 0) {
		pr_err("power state: unbalanced enable/disable calls\n");
		ret = -EINVAL;
		goto out;
	}

	power_state_active_cnt--;
out:
	spin_unlock_irqrestore(&power_state_active_lock, flags);
	return ret;
}

#ifdef CONFIG_REGULATOR_DEBUG

static int power_state_active_get(void)
{
	unsigned long flags;
	int cnt;

	spin_lock_irqsave(&power_state_active_lock, flags);
	cnt = power_state_active_cnt;
	spin_unlock_irqrestore(&power_state_active_lock, flags);

	return cnt;
}

static struct ux500_regulator_debug {
	struct dentry *dir;
	struct dbx500_regulator_info *regulator_array;
	int num_regulators;
	u8 *state_before_suspend;
	u8 *state_after_suspend;
} rdebug;

static int ux500_regulator_power_state_cnt_show(struct seq_file *s, void *p)
{
	/* print power state count */
	seq_printf(s, "ux500-regulator power state count: %i\n",
		   power_state_active_get());

	return 0;
}
DEFINE_SHOW_ATTRIBUTE(ux500_regulator_power_state_cnt);

static int ux500_regulator_status_show(struct seq_file *s, void *p)
{
	int i;

	/* print dump header */
	seq_puts(s, "ux500-regulator status:\n");
	seq_printf(s, "%31s : %8s : %8s\n", "current", "before", "after");

	for (i = 0; i < rdebug.num_regulators; i++) {
		struct dbx500_regulator_info *info;
		/* Access per-regulator data */
		info = &rdebug.regulator_array[i];

		/* print status */
		seq_printf(s, "%20s : %8s : %8s : %8s\n",
			   info->desc.name,
			   info->is_enabled ? "enabled" : "disabled",
			   rdebug.state_before_suspend[i] ? "enabled" : "disabled",
			   rdebug.state_after_suspend[i] ? "enabled" : "disabled");
	}

	return 0;
}
DEFINE_SHOW_ATTRIBUTE(ux500_regulator_status);

int
ux500_regulator_debug_init(struct platform_device *pdev,
	struct dbx500_regulator_info *regulator_info,
	int num_regulators)
{
	/* create directory */
	rdebug.dir = debugfs_create_dir("ux500-regulator", NULL);

	/* create "status" file */
	debugfs_create_file("status", S_IRUGO, rdebug.dir, &pdev->dev,
			    &ux500_regulator_status_fops);

	/* create "power-state-count" file */
	debugfs_create_file("power-state-count", S_IRUGO, rdebug.dir,
			    &pdev->dev, &ux500_regulator_power_state_cnt_fops);

	rdebug.regulator_array = regulator_info;
	rdebug.num_regulators = num_regulators;

	rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL);
	if (!rdebug.state_before_suspend)
		goto exit_destroy_power_state;

	rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL);
	if (!rdebug.state_after_suspend)
		goto exit_free;

	return 0;

exit_free:
	kfree(rdebug.state_before_suspend);
exit_destroy_power_state:
	debugfs_remove_recursive(rdebug.dir);
	return -ENOMEM;
}

int ux500_regulator_debug_exit(void)
{
	debugfs_remove_recursive(rdebug.dir);
	kfree(rdebug.state_after_suspend);
	kfree(rdebug.state_before_suspend);

	return 0;
}
#endif
Commit	Line	Data
0376148f	1	// SPDX-License-Identifier: GPL-2.0-only
38e96838 BJ	2	/*
	3	* Copyright (C) ST-Ericsson SA 2010
	4	*
38e96838 BJ	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>
7f46d0f8	17	#include <linux/module.h>
38e96838 BJ	18
	19	#include "dbx500-prcmu.h"
	20
	21	/*
	22	* power state reference count
	23	*/
	24	static int power_state_active_cnt; /* will initialize to zero */
	25	static DEFINE_SPINLOCK(power_state_active_lock);
	26
38e96838 BJ	27	void 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
	36	int 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--;
	49	out:
	50	spin_unlock_irqrestore(&power_state_active_lock, flags);
	51	return ret;
	52	}
	53
	54	#ifdef CONFIG_REGULATOR_DEBUG
	55
3d75095a SK	56	static 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
38e96838 BJ	68	static struct ux500_regulator_debug {
38e96838 BJ	69	struct dentry *dir;
38e96838 BJ	70	struct dbx500_regulator_info *regulator_array;
	71	int num_regulators;
	72	u8 *state_before_suspend;
	73	u8 *state_after_suspend;
	74	} rdebug;
	75
3e60b4fc	76	static int ux500_regulator_power_state_cnt_show(struct seq_file s, void p)
38e96838	77	{
38e96838	78	/* print power state count */
af78114e JP	79	seq_printf(s, "ux500-regulator power state count: %i\n",
af78114e JP	80	power_state_active_get());
38e96838 BJ	81
	82	return 0;
	83	}
3e60b4fc	84	DEFINE_SHOW_ATTRIBUTE(ux500_regulator_power_state_cnt);
38e96838	85
3e60b4fc	86	static int ux500_regulator_status_show(struct seq_file s, void p)
38e96838	87	{
38e96838 BJ	88	int i;
	89
	90	/* print dump header */
af78114e JP	91	seq_puts(s, "ux500-regulator status:\n");
af78114e JP	92	seq_printf(s, "%31s : %8s : %8s\n", "current", "before", "after");
38e96838 BJ	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 */
af78114e JP	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");
38e96838 BJ	105	}
	106
	107	return 0;
	108	}
3e60b4fc	109	DEFINE_SHOW_ATTRIBUTE(ux500_regulator_status);
38e96838	110
a5023574	111	int
38e96838 BJ	112	ux500_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);
38e96838 BJ	118
38e96838 BJ	119	/* create "status" file */
8bdaa438 GKH	120	debugfs_create_file("status", S_IRUGO, rdebug.dir, &pdev->dev,
8bdaa438 GKH	121	&ux500_regulator_status_fops);
38e96838 BJ	122
38e96838 BJ	123	/* create "power-state-count" file */
8bdaa438 GKH	124	debugfs_create_file("power-state-count", S_IRUGO, rdebug.dir,
8bdaa438 GKH	125	&pdev->dev, &ux500_regulator_power_state_cnt_fops);
38e96838 BJ	126
	127	rdebug.regulator_array = regulator_info;
	128	rdebug.num_regulators = num_regulators;
	129
	130	rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL);
cb487c5c	131	if (!rdebug.state_before_suspend)
38e96838	132	goto exit_destroy_power_state;
38e96838 BJ	133
38e96838 BJ	134	rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL);
cb487c5c	135	if (!rdebug.state_after_suspend)
38e96838	136	goto exit_free;
38e96838	137
38e96838 BJ	138	return 0;
	139
	140	exit_free:
	141	kfree(rdebug.state_before_suspend);
	142	exit_destroy_power_state:
8bdaa438	143	debugfs_remove_recursive(rdebug.dir);
38e96838 BJ	144	return -ENOMEM;
	145	}
	146
8dc995f5	147	int ux500_regulator_debug_exit(void)
38e96838 BJ	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