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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 __devinit | |
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 |