drivers/regulator/dbx500-prcmu.c

   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
  82         for (i = 0; i < rdebug.num_regulators; i++)
  83                 rdebug.state_before_suspend[i] =
  84                         rdebug.regulator_array[i].is_enabled;
  85 }
  86
  87 void ux500_regulator_resume_debug(void)
  88 {
  89         int i;
  90
  91         for (i = 0; i < rdebug.num_regulators; i++)
  92                 rdebug.state_after_suspend[i] =
  93                         rdebug.regulator_array[i].is_enabled;
  94 }
  95
  96 static int ux500_regulator_power_state_cnt_print(struct seq_file *s, void *p)
  97 {
  98         struct device *dev = s->private;
  99         int err;
 100
 101         /* print power state count */
 102         err = seq_printf(s, "ux500-regulator power state count: %i\n",
 103                 power_state_active_get());
 104         if (err < 0)
 105                 dev_err(dev, "seq_printf overflow\n");
 106
 107         return 0;
 108 }
 109
 110 static int ux500_regulator_power_state_cnt_open(struct inode *inode,
 111         struct file *file)
 112 {
 113         return single_open(file, ux500_regulator_power_state_cnt_print,
 114                 inode->i_private);
 115 }
 116
 117 static const struct file_operations ux500_regulator_power_state_cnt_fops = {
 118         .open = ux500_regulator_power_state_cnt_open,
 119         .read = seq_read,
 120         .llseek = seq_lseek,
 121         .release = single_release,
 122         .owner = THIS_MODULE,
 123 };
 124
 125 static int ux500_regulator_status_print(struct seq_file *s, void *p)
 126 {
 127         struct device *dev = s->private;
 128         int err;
 129         int i;
 130
 131         /* print dump header */
 132         err = seq_puts(s, "ux500-regulator status:\n");
 133         if (err < 0)
 134                 dev_err(dev, "seq_puts overflow\n");
 135
 136         err = seq_printf(s, "%31s : %8s : %8s\n", "current",
 137                 "before", "after");
 138         if (err < 0)
 139                 dev_err(dev, "seq_printf overflow\n");
 140
 141         for (i = 0; i < rdebug.num_regulators; i++) {
 142                 struct dbx500_regulator_info *info;
 143                 /* Access per-regulator data */
 144                 info = &rdebug.regulator_array[i];
 145
 146                 /* print status */
 147                 err = seq_printf(s, "%20s : %8s : %8s : %8s\n", info->desc.name,
 148                         info->is_enabled ? "enabled" : "disabled",
 149                         rdebug.state_before_suspend[i] ? "enabled" : "disabled",
 150                         rdebug.state_after_suspend[i] ? "enabled" : "disabled");
 151                 if (err < 0)
 152                         dev_err(dev, "seq_printf overflow\n");
 153         }
 154
 155         return 0;
 156 }
 157
 158 static int ux500_regulator_status_open(struct inode *inode, struct file *file)
 159 {
 160         return single_open(file, ux500_regulator_status_print,
 161                 inode->i_private);
 162 }
 163
 164 static const struct file_operations ux500_regulator_status_fops = {
 165         .open = ux500_regulator_status_open,
 166         .read = seq_read,
 167         .llseek = seq_lseek,
 168         .release = single_release,
 169         .owner = THIS_MODULE,
 170 };
 171
 172 int __attribute__((weak)) dbx500_regulator_testcase(
 173         struct dbx500_regulator_info *regulator_info,
 174         int num_regulators)
 175 {
 176         return 0;
 177 }
 178
 179 int
 180 ux500_regulator_debug_init(struct platform_device *pdev,
 181         struct dbx500_regulator_info *regulator_info,
 182         int num_regulators)
 183 {
 184         /* create directory */
 185         rdebug.dir = debugfs_create_dir("ux500-regulator", NULL);
 186         if (!rdebug.dir)
 187                 goto exit_no_debugfs;
 188
 189         /* create "status" file */
 190         rdebug.status_file = debugfs_create_file("status",
 191                 S_IRUGO, rdebug.dir, &pdev->dev,
 192                 &ux500_regulator_status_fops);
 193         if (!rdebug.status_file)
 194                 goto exit_destroy_dir;
 195
 196         /* create "power-state-count" file */
 197         rdebug.power_state_cnt_file = debugfs_create_file("power-state-count",
 198                 S_IRUGO, rdebug.dir, &pdev->dev,
 199                 &ux500_regulator_power_state_cnt_fops);
 200         if (!rdebug.power_state_cnt_file)
 201                 goto exit_destroy_status;
 202
 203         rdebug.regulator_array = regulator_info;
 204         rdebug.num_regulators = num_regulators;
 205
 206         rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL);
 207         if (!rdebug.state_before_suspend)
 208                 goto exit_destroy_power_state;
 209
 210         rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL);
 211         if (!rdebug.state_after_suspend)
 212                 goto exit_free;
 213
 214         dbx500_regulator_testcase(regulator_info, num_regulators);
 215         return 0;
 216
 217 exit_free:
 218         kfree(rdebug.state_before_suspend);
 219 exit_destroy_power_state:
 220         debugfs_remove(rdebug.power_state_cnt_file);
 221 exit_destroy_status:
 222         debugfs_remove(rdebug.status_file);
 223 exit_destroy_dir:
 224         debugfs_remove(rdebug.dir);
 225 exit_no_debugfs:
 226         dev_err(&pdev->dev, "failed to create debugfs entries.\n");
 227         return -ENOMEM;
 228 }
 229
 230 int ux500_regulator_debug_exit(void)
 231 {
 232         debugfs_remove_recursive(rdebug.dir);
 233         kfree(rdebug.state_after_suspend);
 234         kfree(rdebug.state_before_suspend);
 235
 236         return 0;
 237 }
 238 #endif