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38e96838 BJ |
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> | |
7f46d0f8 | 17 | #include <linux/module.h> |
38e96838 BJ |
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 | ||
38e96838 BJ |
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 | ||
3d75095a SK |
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 | ||
38e96838 BJ |
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; | |
e77addc5 | 81 | |
38e96838 BJ |
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; | |
e77addc5 | 90 | |
38e96838 BJ |
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 */ | |
80c48e72 | 132 | err = seq_puts(s, "ux500-regulator status:\n"); |
38e96838 | 133 | if (err < 0) |
80c48e72 | 134 | dev_err(dev, "seq_puts overflow\n"); |
38e96838 BJ |
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 | ||
a5023574 | 179 | int |
38e96838 BJ |
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); | |
cb487c5c | 207 | if (!rdebug.state_before_suspend) |
38e96838 | 208 | goto exit_destroy_power_state; |
38e96838 BJ |
209 | |
210 | rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL); | |
cb487c5c | 211 | if (!rdebug.state_after_suspend) |
38e96838 | 212 | goto exit_free; |
38e96838 BJ |
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 | ||
8dc995f5 | 230 | int ux500_regulator_debug_exit(void) |
38e96838 BJ |
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 |