Merge remote-tracking branch 'regulator/fix/db8500' into tmp
[~shefty/rdma-dev.git] / 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 int power_state_active_get(void)
28 {
29         unsigned long flags;
30         int cnt;
31
32         spin_lock_irqsave(&power_state_active_lock, flags);
33         cnt = power_state_active_cnt;
34         spin_unlock_irqrestore(&power_state_active_lock, flags);
35
36         return cnt;
37 }
38
39 void power_state_active_enable(void)
40 {
41         unsigned long flags;
42
43         spin_lock_irqsave(&power_state_active_lock, flags);
44         power_state_active_cnt++;
45         spin_unlock_irqrestore(&power_state_active_lock, flags);
46 }
47
48 int power_state_active_disable(void)
49 {
50         int ret = 0;
51         unsigned long flags;
52
53         spin_lock_irqsave(&power_state_active_lock, flags);
54         if (power_state_active_cnt <= 0) {
55                 pr_err("power state: unbalanced enable/disable calls\n");
56                 ret = -EINVAL;
57                 goto out;
58         }
59
60         power_state_active_cnt--;
61 out:
62         spin_unlock_irqrestore(&power_state_active_lock, flags);
63         return ret;
64 }
65
66 #ifdef CONFIG_REGULATOR_DEBUG
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