drivers/regulator/dbx500-prcmu.c

   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  */
  24 static int power_state_active_cnt; /* will initialize to zero */
  25 static DEFINE_SPINLOCK(power_state_active_lock);
  26
  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
  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
  68 static 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
  76 static 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 }
  84 DEFINE_SHOW_ATTRIBUTE(ux500_regulator_power_state_cnt);
  85
  86 static 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 }
 109 DEFINE_SHOW_ATTRIBUTE(ux500_regulator_status);
 110
 111 int
 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);
 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
 140 exit_free:
 141         kfree(rdebug.state_before_suspend);
 142 exit_destroy_power_state:
 143         debugfs_remove_recursive(rdebug.dir);
 144         return -ENOMEM;
 145 }
 146
 147 int 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