[linux-2.6-block.git] / drivers / regulator / dbx500-prcmu.c

/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * License Terms: GNU General Public License v2
 * 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 dentry *status_file;
	struct dentry *power_state_cnt_file;
	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 __attribute__((weak)) dbx500_regulator_testcase(
	struct dbx500_regulator_info *regulator_info,
	int num_regulators)
{
	return 0;
}

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);
	if (!rdebug.dir)
		goto exit_no_debugfs;

	/* create "status" file */
	rdebug.status_file = debugfs_create_file("status",
		S_IRUGO, rdebug.dir, &pdev->dev,
		&ux500_regulator_status_fops);
	if (!rdebug.status_file)
		goto exit_destroy_dir;

	/* create "power-state-count" file */
	rdebug.power_state_cnt_file = debugfs_create_file("power-state-count",
		S_IRUGO, rdebug.dir, &pdev->dev,
		&ux500_regulator_power_state_cnt_fops);
	if (!rdebug.power_state_cnt_file)
		goto exit_destroy_status;

	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;

	dbx500_regulator_testcase(regulator_info, num_regulators);
	return 0;

exit_free:
	kfree(rdebug.state_before_suspend);
exit_destroy_power_state:
	debugfs_remove(rdebug.power_state_cnt_file);
exit_destroy_status:
	debugfs_remove(rdebug.status_file);
exit_destroy_dir:
	debugfs_remove(rdebug.dir);
exit_no_debugfs:
	dev_err(&pdev->dev, "failed to create debugfs entries.\n");
	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
38e96838 BJ	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>
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 {
	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
3e60b4fc	78	static int ux500_regulator_power_state_cnt_show(struct seq_file s, void p)
38e96838	79	{
38e96838	80	/* print power state count */
af78114e JP	81	seq_printf(s, "ux500-regulator power state count: %i\n",
af78114e JP	82	power_state_active_get());
38e96838 BJ	83
	84	return 0;
	85	}
3e60b4fc	86	DEFINE_SHOW_ATTRIBUTE(ux500_regulator_power_state_cnt);
38e96838	87
3e60b4fc	88	static int ux500_regulator_status_show(struct seq_file s, void p)
38e96838	89	{
38e96838 BJ	90	int i;
	91
	92	/* print dump header */
af78114e JP	93	seq_puts(s, "ux500-regulator status:\n");
af78114e JP	94	seq_printf(s, "%31s : %8s : %8s\n", "current", "before", "after");
38e96838 BJ	95
	96	for (i = 0; i < rdebug.num_regulators; i++) {
	97	struct dbx500_regulator_info *info;
	98	/* Access per-regulator data */
	99	info = &rdebug.regulator_array[i];
	100
	101	/* print status */
af78114e JP	102	seq_printf(s, "%20s : %8s : %8s : %8s\n",
	103	info->desc.name,
	104	info->is_enabled ? "enabled" : "disabled",
	105	rdebug.state_before_suspend[i] ? "enabled" : "disabled",
	106	rdebug.state_after_suspend[i] ? "enabled" : "disabled");
38e96838 BJ	107	}
	108
	109	return 0;
	110	}
3e60b4fc	111	DEFINE_SHOW_ATTRIBUTE(ux500_regulator_status);
38e96838 BJ	112
	113	int __attribute__((weak)) dbx500_regulator_testcase(
	114	struct dbx500_regulator_info *regulator_info,
	115	int num_regulators)
	116	{
	117	return 0;
	118	}
	119
a5023574	120	int
38e96838 BJ	121	ux500_regulator_debug_init(struct platform_device *pdev,
	122	struct dbx500_regulator_info *regulator_info,
	123	int num_regulators)
	124	{
	125	/* create directory */
	126	rdebug.dir = debugfs_create_dir("ux500-regulator", NULL);
	127	if (!rdebug.dir)
	128	goto exit_no_debugfs;
	129
	130	/* create "status" file */
	131	rdebug.status_file = debugfs_create_file("status",
	132	S_IRUGO, rdebug.dir, &pdev->dev,
	133	&ux500_regulator_status_fops);
	134	if (!rdebug.status_file)
	135	goto exit_destroy_dir;
	136
	137	/* create "power-state-count" file */
	138	rdebug.power_state_cnt_file = debugfs_create_file("power-state-count",
	139	S_IRUGO, rdebug.dir, &pdev->dev,
	140	&ux500_regulator_power_state_cnt_fops);
	141	if (!rdebug.power_state_cnt_file)
	142	goto exit_destroy_status;
	143
	144	rdebug.regulator_array = regulator_info;
	145	rdebug.num_regulators = num_regulators;
	146
	147	rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL);
cb487c5c	148	if (!rdebug.state_before_suspend)
38e96838	149	goto exit_destroy_power_state;
38e96838 BJ	150
38e96838 BJ	151	rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL);
cb487c5c	152	if (!rdebug.state_after_suspend)
38e96838	153	goto exit_free;
38e96838 BJ	154
	155	dbx500_regulator_testcase(regulator_info, num_regulators);
	156	return 0;
	157
	158	exit_free:
	159	kfree(rdebug.state_before_suspend);
	160	exit_destroy_power_state:
	161	debugfs_remove(rdebug.power_state_cnt_file);
	162	exit_destroy_status:
	163	debugfs_remove(rdebug.status_file);
	164	exit_destroy_dir:
	165	debugfs_remove(rdebug.dir);
	166	exit_no_debugfs:
	167	dev_err(&pdev->dev, "failed to create debugfs entries.\n");
	168	return -ENOMEM;
	169	}
	170
8dc995f5	171	int ux500_regulator_debug_exit(void)
38e96838 BJ	172	{
	173	debugfs_remove_recursive(rdebug.dir);
	174	kfree(rdebug.state_after_suspend);
	175	kfree(rdebug.state_before_suspend);
	176
	177	return 0;
	178	}
	179	#endif