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 18 #include "dbx500-prcmu.h" 19 20 /* 21 * power state reference count 22 */ 23 static int power_state_active_cnt; /* will initialize to zero */ 24 static DEFINE_SPINLOCK(power_state_active_lock); 25 26 int power_state_active_get(void) 27 { 28 unsigned long flags; 29 int cnt; 30 31 spin_lock_irqsave(&power_state_active_lock, flags); 32 cnt = power_state_active_cnt; 33 spin_unlock_irqrestore(&power_state_active_lock, flags); 34 35 return cnt; 36 } 37 38 void power_state_active_enable(void) 39 { 40 unsigned long flags; 41 42 spin_lock_irqsave(&power_state_active_lock, flags); 43 power_state_active_cnt++; 44 spin_unlock_irqrestore(&power_state_active_lock, flags); 45 } 46 47 int power_state_active_disable(void) 48 { 49 int ret = 0; 50 unsigned long flags; 51 52 spin_lock_irqsave(&power_state_active_lock, flags); 53 if (power_state_active_cnt <= 0) { 54 pr_err("power state: unbalanced enable/disable calls\n"); 55 ret = -EINVAL; 56 goto out; 57 } 58 59 power_state_active_cnt--; 60 out: 61 spin_unlock_irqrestore(&power_state_active_lock, flags); 62 return ret; 63 } 64 65 #ifdef CONFIG_REGULATOR_DEBUG 66 67 static struct ux500_regulator_debug { 68 struct dentry *dir; 69 struct dentry *status_file; 70 struct dentry *power_state_cnt_file; 71 struct dbx500_regulator_info *regulator_array; 72 int num_regulators; 73 u8 *state_before_suspend; 74 u8 *state_after_suspend; 75 } rdebug; 76 77 void ux500_regulator_suspend_debug(void) 78 { 79 int i; 80 for (i = 0; i < rdebug.num_regulators; i++) 81 rdebug.state_before_suspend[i] = 82 rdebug.regulator_array[i].is_enabled; 83 } 84 85 void ux500_regulator_resume_debug(void) 86 { 87 int i; 88 for (i = 0; i < rdebug.num_regulators; i++) 89 rdebug.state_after_suspend[i] = 90 rdebug.regulator_array[i].is_enabled; 91 } 92 93 static int ux500_regulator_power_state_cnt_print(struct seq_file *s, void *p) 94 { 95 struct device *dev = s->private; 96 int err; 97 98 /* print power state count */ 99 err = seq_printf(s, "ux500-regulator power state count: %i\n", 100 power_state_active_get()); 101 if (err < 0) 102 dev_err(dev, "seq_printf overflow\n"); 103 104 return 0; 105 } 106 107 static int ux500_regulator_power_state_cnt_open(struct inode *inode, 108 struct file *file) 109 { 110 return single_open(file, ux500_regulator_power_state_cnt_print, 111 inode->i_private); 112 } 113 114 static const struct file_operations ux500_regulator_power_state_cnt_fops = { 115 .open = ux500_regulator_power_state_cnt_open, 116 .read = seq_read, 117 .llseek = seq_lseek, 118 .release = single_release, 119 .owner = THIS_MODULE, 120 }; 121 122 static int ux500_regulator_status_print(struct seq_file *s, void *p) 123 { 124 struct device *dev = s->private; 125 int err; 126 int i; 127 128 /* print dump header */ 129 err = seq_printf(s, "ux500-regulator status:\n"); 130 if (err < 0) 131 dev_err(dev, "seq_printf overflow\n"); 132 133 err = seq_printf(s, "%31s : %8s : %8s\n", "current", 134 "before", "after"); 135 if (err < 0) 136 dev_err(dev, "seq_printf overflow\n"); 137 138 for (i = 0; i < rdebug.num_regulators; i++) { 139 struct dbx500_regulator_info *info; 140 /* Access per-regulator data */ 141 info = &rdebug.regulator_array[i]; 142 143 /* print status */ 144 err = seq_printf(s, "%20s : %8s : %8s : %8s\n", info->desc.name, 145 info->is_enabled ? "enabled" : "disabled", 146 rdebug.state_before_suspend[i] ? "enabled" : "disabled", 147 rdebug.state_after_suspend[i] ? "enabled" : "disabled"); 148 if (err < 0) 149 dev_err(dev, "seq_printf overflow\n"); 150 } 151 152 return 0; 153 } 154 155 static int ux500_regulator_status_open(struct inode *inode, struct file *file) 156 { 157 return single_open(file, ux500_regulator_status_print, 158 inode->i_private); 159 } 160 161 static const struct file_operations ux500_regulator_status_fops = { 162 .open = ux500_regulator_status_open, 163 .read = seq_read, 164 .llseek = seq_lseek, 165 .release = single_release, 166 .owner = THIS_MODULE, 167 }; 168 169 int __attribute__((weak)) dbx500_regulator_testcase( 170 struct dbx500_regulator_info *regulator_info, 171 int num_regulators) 172 { 173 return 0; 174 } 175 176 int 177 ux500_regulator_debug_init(struct platform_device *pdev, 178 struct dbx500_regulator_info *regulator_info, 179 int num_regulators) 180 { 181 /* create directory */ 182 rdebug.dir = debugfs_create_dir("ux500-regulator", NULL); 183 if (!rdebug.dir) 184 goto exit_no_debugfs; 185 186 /* create "status" file */ 187 rdebug.status_file = debugfs_create_file("status", 188 S_IRUGO, rdebug.dir, &pdev->dev, 189 &ux500_regulator_status_fops); 190 if (!rdebug.status_file) 191 goto exit_destroy_dir; 192 193 /* create "power-state-count" file */ 194 rdebug.power_state_cnt_file = debugfs_create_file("power-state-count", 195 S_IRUGO, rdebug.dir, &pdev->dev, 196 &ux500_regulator_power_state_cnt_fops); 197 if (!rdebug.power_state_cnt_file) 198 goto exit_destroy_status; 199 200 rdebug.regulator_array = regulator_info; 201 rdebug.num_regulators = num_regulators; 202 203 rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL); 204 if (!rdebug.state_before_suspend) { 205 dev_err(&pdev->dev, 206 "could not allocate memory for saving state\n"); 207 goto exit_destroy_power_state; 208 } 209 210 rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL); 211 if (!rdebug.state_after_suspend) { 212 dev_err(&pdev->dev, 213 "could not allocate memory for saving state\n"); 214 goto exit_free; 215 } 216 217 dbx500_regulator_testcase(regulator_info, num_regulators); 218 return 0; 219 220 exit_free: 221 kfree(rdebug.state_before_suspend); 222 exit_destroy_power_state: 223 debugfs_remove(rdebug.power_state_cnt_file); 224 exit_destroy_status: 225 debugfs_remove(rdebug.status_file); 226 exit_destroy_dir: 227 debugfs_remove(rdebug.dir); 228 exit_no_debugfs: 229 dev_err(&pdev->dev, "failed to create debugfs entries.\n"); 230 return -ENOMEM; 231 } 232 233 int __devexit ux500_regulator_debug_exit(void) 234 { 235 debugfs_remove_recursive(rdebug.dir); 236 kfree(rdebug.state_after_suspend); 237 kfree(rdebug.state_before_suspend); 238 239 return 0; 240 } 241 #endif 242