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> 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_print(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 87 static int ux500_regulator_power_state_cnt_open(struct inode *inode, 88 struct file *file) 89 { 90 return single_open(file, ux500_regulator_power_state_cnt_print, 91 inode->i_private); 92 } 93 94 static const struct file_operations ux500_regulator_power_state_cnt_fops = { 95 .open = ux500_regulator_power_state_cnt_open, 96 .read = seq_read, 97 .llseek = seq_lseek, 98 .release = single_release, 99 .owner = THIS_MODULE, 100 }; 101 102 static int ux500_regulator_status_print(struct seq_file *s, void *p) 103 { 104 int i; 105 106 /* print dump header */ 107 seq_puts(s, "ux500-regulator status:\n"); 108 seq_printf(s, "%31s : %8s : %8s\n", "current", "before", "after"); 109 110 for (i = 0; i < rdebug.num_regulators; i++) { 111 struct dbx500_regulator_info *info; 112 /* Access per-regulator data */ 113 info = &rdebug.regulator_array[i]; 114 115 /* print status */ 116 seq_printf(s, "%20s : %8s : %8s : %8s\n", 117 info->desc.name, 118 info->is_enabled ? "enabled" : "disabled", 119 rdebug.state_before_suspend[i] ? "enabled" : "disabled", 120 rdebug.state_after_suspend[i] ? "enabled" : "disabled"); 121 } 122 123 return 0; 124 } 125 126 static int ux500_regulator_status_open(struct inode *inode, struct file *file) 127 { 128 return single_open(file, ux500_regulator_status_print, 129 inode->i_private); 130 } 131 132 static const struct file_operations ux500_regulator_status_fops = { 133 .open = ux500_regulator_status_open, 134 .read = seq_read, 135 .llseek = seq_lseek, 136 .release = single_release, 137 .owner = THIS_MODULE, 138 }; 139 140 int __attribute__((weak)) dbx500_regulator_testcase( 141 struct dbx500_regulator_info *regulator_info, 142 int num_regulators) 143 { 144 return 0; 145 } 146 147 int 148 ux500_regulator_debug_init(struct platform_device *pdev, 149 struct dbx500_regulator_info *regulator_info, 150 int num_regulators) 151 { 152 /* create directory */ 153 rdebug.dir = debugfs_create_dir("ux500-regulator", NULL); 154 if (!rdebug.dir) 155 goto exit_no_debugfs; 156 157 /* create "status" file */ 158 rdebug.status_file = debugfs_create_file("status", 159 S_IRUGO, rdebug.dir, &pdev->dev, 160 &ux500_regulator_status_fops); 161 if (!rdebug.status_file) 162 goto exit_destroy_dir; 163 164 /* create "power-state-count" file */ 165 rdebug.power_state_cnt_file = debugfs_create_file("power-state-count", 166 S_IRUGO, rdebug.dir, &pdev->dev, 167 &ux500_regulator_power_state_cnt_fops); 168 if (!rdebug.power_state_cnt_file) 169 goto exit_destroy_status; 170 171 rdebug.regulator_array = regulator_info; 172 rdebug.num_regulators = num_regulators; 173 174 rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL); 175 if (!rdebug.state_before_suspend) 176 goto exit_destroy_power_state; 177 178 rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL); 179 if (!rdebug.state_after_suspend) 180 goto exit_free; 181 182 dbx500_regulator_testcase(regulator_info, num_regulators); 183 return 0; 184 185 exit_free: 186 kfree(rdebug.state_before_suspend); 187 exit_destroy_power_state: 188 debugfs_remove(rdebug.power_state_cnt_file); 189 exit_destroy_status: 190 debugfs_remove(rdebug.status_file); 191 exit_destroy_dir: 192 debugfs_remove(rdebug.dir); 193 exit_no_debugfs: 194 dev_err(&pdev->dev, "failed to create debugfs entries.\n"); 195 return -ENOMEM; 196 } 197 198 int ux500_regulator_debug_exit(void) 199 { 200 debugfs_remove_recursive(rdebug.dir); 201 kfree(rdebug.state_after_suspend); 202 kfree(rdebug.state_before_suspend); 203 204 return 0; 205 } 206 #endif 207