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 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 78 static int ux500_regulator_power_state_cnt_show(struct seq_file *s, void *p) 79 { 80 /* print power state count */ 81 seq_printf(s, "ux500-regulator power state count: %i\n", 82 power_state_active_get()); 83 84 return 0; 85 } 86 DEFINE_SHOW_ATTRIBUTE(ux500_regulator_power_state_cnt); 87 88 static int ux500_regulator_status_show(struct seq_file *s, void *p) 89 { 90 int i; 91 92 /* print dump header */ 93 seq_puts(s, "ux500-regulator status:\n"); 94 seq_printf(s, "%31s : %8s : %8s\n", "current", "before", "after"); 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 */ 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"); 107 } 108 109 return 0; 110 } 111 DEFINE_SHOW_ATTRIBUTE(ux500_regulator_status); 112 113 int __attribute__((weak)) dbx500_regulator_testcase( 114 struct dbx500_regulator_info *regulator_info, 115 int num_regulators) 116 { 117 return 0; 118 } 119 120 int 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); 148 if (!rdebug.state_before_suspend) 149 goto exit_destroy_power_state; 150 151 rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL); 152 if (!rdebug.state_after_suspend) 153 goto exit_free; 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 } 170 171 int ux500_regulator_debug_exit(void) 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 180