180 lines
4.4 KiB
C
180 lines
4.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
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* Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson
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*
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* UX500 common part of Power domain regulators
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*/
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#include <linux/kernel.h>
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#include <linux/err.h>
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#include <linux/regulator/driver.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include "dbx500-prcmu.h"
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/*
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* power state reference count
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*/
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static int power_state_active_cnt; /* will initialize to zero */
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static DEFINE_SPINLOCK(power_state_active_lock);
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void power_state_active_enable(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&power_state_active_lock, flags);
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power_state_active_cnt++;
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spin_unlock_irqrestore(&power_state_active_lock, flags);
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}
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int power_state_active_disable(void)
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{
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int ret = 0;
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unsigned long flags;
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spin_lock_irqsave(&power_state_active_lock, flags);
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if (power_state_active_cnt <= 0) {
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pr_err("power state: unbalanced enable/disable calls\n");
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ret = -EINVAL;
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goto out;
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}
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power_state_active_cnt--;
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out:
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spin_unlock_irqrestore(&power_state_active_lock, flags);
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return ret;
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}
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#ifdef CONFIG_REGULATOR_DEBUG
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static int power_state_active_get(void)
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{
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unsigned long flags;
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int cnt;
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spin_lock_irqsave(&power_state_active_lock, flags);
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cnt = power_state_active_cnt;
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spin_unlock_irqrestore(&power_state_active_lock, flags);
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return cnt;
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}
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static struct ux500_regulator_debug {
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struct dentry *dir;
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struct dentry *status_file;
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struct dentry *power_state_cnt_file;
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struct dbx500_regulator_info *regulator_array;
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int num_regulators;
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u8 *state_before_suspend;
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u8 *state_after_suspend;
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} rdebug;
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static int ux500_regulator_power_state_cnt_show(struct seq_file *s, void *p)
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{
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/* print power state count */
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seq_printf(s, "ux500-regulator power state count: %i\n",
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power_state_active_get());
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(ux500_regulator_power_state_cnt);
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static int ux500_regulator_status_show(struct seq_file *s, void *p)
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{
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int i;
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/* print dump header */
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seq_puts(s, "ux500-regulator status:\n");
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seq_printf(s, "%31s : %8s : %8s\n", "current", "before", "after");
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for (i = 0; i < rdebug.num_regulators; i++) {
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struct dbx500_regulator_info *info;
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/* Access per-regulator data */
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info = &rdebug.regulator_array[i];
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/* print status */
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seq_printf(s, "%20s : %8s : %8s : %8s\n",
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info->desc.name,
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info->is_enabled ? "enabled" : "disabled",
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rdebug.state_before_suspend[i] ? "enabled" : "disabled",
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rdebug.state_after_suspend[i] ? "enabled" : "disabled");
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}
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(ux500_regulator_status);
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int __attribute__((weak)) dbx500_regulator_testcase(
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struct dbx500_regulator_info *regulator_info,
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int num_regulators)
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{
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return 0;
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}
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int
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ux500_regulator_debug_init(struct platform_device *pdev,
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struct dbx500_regulator_info *regulator_info,
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int num_regulators)
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{
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/* create directory */
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rdebug.dir = debugfs_create_dir("ux500-regulator", NULL);
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if (!rdebug.dir)
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goto exit_no_debugfs;
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/* create "status" file */
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rdebug.status_file = debugfs_create_file("status",
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S_IRUGO, rdebug.dir, &pdev->dev,
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&ux500_regulator_status_fops);
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if (!rdebug.status_file)
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goto exit_destroy_dir;
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/* create "power-state-count" file */
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rdebug.power_state_cnt_file = debugfs_create_file("power-state-count",
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S_IRUGO, rdebug.dir, &pdev->dev,
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&ux500_regulator_power_state_cnt_fops);
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if (!rdebug.power_state_cnt_file)
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goto exit_destroy_status;
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rdebug.regulator_array = regulator_info;
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rdebug.num_regulators = num_regulators;
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rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL);
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if (!rdebug.state_before_suspend)
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goto exit_destroy_power_state;
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rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL);
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if (!rdebug.state_after_suspend)
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goto exit_free;
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dbx500_regulator_testcase(regulator_info, num_regulators);
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return 0;
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exit_free:
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kfree(rdebug.state_before_suspend);
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exit_destroy_power_state:
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debugfs_remove(rdebug.power_state_cnt_file);
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exit_destroy_status:
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debugfs_remove(rdebug.status_file);
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exit_destroy_dir:
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debugfs_remove(rdebug.dir);
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exit_no_debugfs:
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dev_err(&pdev->dev, "failed to create debugfs entries.\n");
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return -ENOMEM;
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}
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int ux500_regulator_debug_exit(void)
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{
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debugfs_remove_recursive(rdebug.dir);
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kfree(rdebug.state_after_suspend);
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kfree(rdebug.state_before_suspend);
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return 0;
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}
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#endif
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