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 void ux500_regulator_suspend_debug(void) 79 { 80 int i; 81 for (i = 0; i < rdebug.num_regulators; i++) 82 rdebug.state_before_suspend[i] = 83 rdebug.regulator_array[i].is_enabled; 84 } 85 86 void ux500_regulator_resume_debug(void) 87 { 88 int i; 89 for (i = 0; i < rdebug.num_regulators; i++) 90 rdebug.state_after_suspend[i] = 91 rdebug.regulator_array[i].is_enabled; 92 } 93 94 static int ux500_regulator_power_state_cnt_print(struct seq_file *s, void *p) 95 { 96 struct device *dev = s->private; 97 int err; 98 99 /* print power state count */ 100 err = seq_printf(s, "ux500-regulator power state count: %i\n", 101 power_state_active_get()); 102 if (err < 0) 103 dev_err(dev, "seq_printf overflow\n"); 104 105 return 0; 106 } 107 108 static int ux500_regulator_power_state_cnt_open(struct inode *inode, 109 struct file *file) 110 { 111 return single_open(file, ux500_regulator_power_state_cnt_print, 112 inode->i_private); 113 } 114 115 static const struct file_operations ux500_regulator_power_state_cnt_fops = { 116 .open = ux500_regulator_power_state_cnt_open, 117 .read = seq_read, 118 .llseek = seq_lseek, 119 .release = single_release, 120 .owner = THIS_MODULE, 121 }; 122 123 static int ux500_regulator_status_print(struct seq_file *s, void *p) 124 { 125 struct device *dev = s->private; 126 int err; 127 int i; 128 129 /* print dump header */ 130 err = seq_printf(s, "ux500-regulator status:\n"); 131 if (err < 0) 132 dev_err(dev, "seq_printf overflow\n"); 133 134 err = seq_printf(s, "%31s : %8s : %8s\n", "current", 135 "before", "after"); 136 if (err < 0) 137 dev_err(dev, "seq_printf overflow\n"); 138 139 for (i = 0; i < rdebug.num_regulators; i++) { 140 struct dbx500_regulator_info *info; 141 /* Access per-regulator data */ 142 info = &rdebug.regulator_array[i]; 143 144 /* print status */ 145 err = seq_printf(s, "%20s : %8s : %8s : %8s\n", info->desc.name, 146 info->is_enabled ? "enabled" : "disabled", 147 rdebug.state_before_suspend[i] ? "enabled" : "disabled", 148 rdebug.state_after_suspend[i] ? "enabled" : "disabled"); 149 if (err < 0) 150 dev_err(dev, "seq_printf overflow\n"); 151 } 152 153 return 0; 154 } 155 156 static int ux500_regulator_status_open(struct inode *inode, struct file *file) 157 { 158 return single_open(file, ux500_regulator_status_print, 159 inode->i_private); 160 } 161 162 static const struct file_operations ux500_regulator_status_fops = { 163 .open = ux500_regulator_status_open, 164 .read = seq_read, 165 .llseek = seq_lseek, 166 .release = single_release, 167 .owner = THIS_MODULE, 168 }; 169 170 int __attribute__((weak)) dbx500_regulator_testcase( 171 struct dbx500_regulator_info *regulator_info, 172 int num_regulators) 173 { 174 return 0; 175 } 176 177 int 178 ux500_regulator_debug_init(struct platform_device *pdev, 179 struct dbx500_regulator_info *regulator_info, 180 int num_regulators) 181 { 182 /* create directory */ 183 rdebug.dir = debugfs_create_dir("ux500-regulator", NULL); 184 if (!rdebug.dir) 185 goto exit_no_debugfs; 186 187 /* create "status" file */ 188 rdebug.status_file = debugfs_create_file("status", 189 S_IRUGO, rdebug.dir, &pdev->dev, 190 &ux500_regulator_status_fops); 191 if (!rdebug.status_file) 192 goto exit_destroy_dir; 193 194 /* create "power-state-count" file */ 195 rdebug.power_state_cnt_file = debugfs_create_file("power-state-count", 196 S_IRUGO, rdebug.dir, &pdev->dev, 197 &ux500_regulator_power_state_cnt_fops); 198 if (!rdebug.power_state_cnt_file) 199 goto exit_destroy_status; 200 201 rdebug.regulator_array = regulator_info; 202 rdebug.num_regulators = num_regulators; 203 204 rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL); 205 if (!rdebug.state_before_suspend) { 206 dev_err(&pdev->dev, 207 "could not allocate memory for saving state\n"); 208 goto exit_destroy_power_state; 209 } 210 211 rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL); 212 if (!rdebug.state_after_suspend) { 213 dev_err(&pdev->dev, 214 "could not allocate memory for saving state\n"); 215 goto exit_free; 216 } 217 218 dbx500_regulator_testcase(regulator_info, num_regulators); 219 return 0; 220 221 exit_free: 222 kfree(rdebug.state_before_suspend); 223 exit_destroy_power_state: 224 debugfs_remove(rdebug.power_state_cnt_file); 225 exit_destroy_status: 226 debugfs_remove(rdebug.status_file); 227 exit_destroy_dir: 228 debugfs_remove(rdebug.dir); 229 exit_no_debugfs: 230 dev_err(&pdev->dev, "failed to create debugfs entries.\n"); 231 return -ENOMEM; 232 } 233 234 int ux500_regulator_debug_exit(void) 235 { 236 debugfs_remove_recursive(rdebug.dir); 237 kfree(rdebug.state_after_suspend); 238 kfree(rdebug.state_before_suspend); 239 240 return 0; 241 } 242 #endif 243