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db5bd1e0 AS |
1 | /* |
2 | * scsi_pm.c Copyright (C) 2010 Alan Stern | |
3 | * | |
4 | * SCSI dynamic Power Management | |
5 | * Initial version: Alan Stern <stern@rowland.harvard.edu> | |
6 | */ | |
7 | ||
8 | #include <linux/pm_runtime.h> | |
9 | ||
10 | #include <scsi/scsi.h> | |
11 | #include <scsi/scsi_device.h> | |
12 | #include <scsi/scsi_driver.h> | |
13 | #include <scsi/scsi_host.h> | |
14 | ||
15 | #include "scsi_priv.h" | |
16 | ||
17 | static int scsi_dev_type_suspend(struct device *dev, pm_message_t msg) | |
18 | { | |
19 | struct device_driver *drv; | |
20 | int err; | |
21 | ||
22 | err = scsi_device_quiesce(to_scsi_device(dev)); | |
23 | if (err == 0) { | |
24 | drv = dev->driver; | |
25 | if (drv && drv->suspend) | |
26 | err = drv->suspend(dev, msg); | |
27 | } | |
28 | dev_dbg(dev, "scsi suspend: %d\n", err); | |
29 | return err; | |
30 | } | |
31 | ||
32 | static int scsi_dev_type_resume(struct device *dev) | |
33 | { | |
34 | struct device_driver *drv; | |
35 | int err = 0; | |
36 | ||
37 | drv = dev->driver; | |
38 | if (drv && drv->resume) | |
39 | err = drv->resume(dev); | |
40 | scsi_device_resume(to_scsi_device(dev)); | |
41 | dev_dbg(dev, "scsi resume: %d\n", err); | |
42 | return err; | |
43 | } | |
44 | ||
45 | #ifdef CONFIG_PM_SLEEP | |
46 | ||
47 | static int scsi_bus_suspend_common(struct device *dev, pm_message_t msg) | |
48 | { | |
49 | int err = 0; | |
50 | ||
51 | if (scsi_is_sdev_device(dev)) | |
52 | err = scsi_dev_type_suspend(dev, msg); | |
53 | return err; | |
54 | } | |
55 | ||
56 | static int scsi_bus_resume_common(struct device *dev) | |
57 | { | |
58 | int err = 0; | |
59 | ||
60 | if (scsi_is_sdev_device(dev)) | |
61 | err = scsi_dev_type_resume(dev); | |
bc4f2401 AS |
62 | |
63 | if (err == 0) { | |
64 | pm_runtime_disable(dev); | |
65 | pm_runtime_set_active(dev); | |
66 | pm_runtime_enable(dev); | |
67 | } | |
db5bd1e0 AS |
68 | return err; |
69 | } | |
70 | ||
71 | static int scsi_bus_suspend(struct device *dev) | |
72 | { | |
73 | return scsi_bus_suspend_common(dev, PMSG_SUSPEND); | |
74 | } | |
75 | ||
76 | static int scsi_bus_freeze(struct device *dev) | |
77 | { | |
78 | return scsi_bus_suspend_common(dev, PMSG_FREEZE); | |
79 | } | |
80 | ||
81 | static int scsi_bus_poweroff(struct device *dev) | |
82 | { | |
83 | return scsi_bus_suspend_common(dev, PMSG_HIBERNATE); | |
84 | } | |
85 | ||
86 | #else /* CONFIG_PM_SLEEP */ | |
87 | ||
88 | #define scsi_bus_resume_common NULL | |
89 | #define scsi_bus_suspend NULL | |
90 | #define scsi_bus_freeze NULL | |
91 | #define scsi_bus_poweroff NULL | |
92 | ||
93 | #endif /* CONFIG_PM_SLEEP */ | |
94 | ||
bc4f2401 AS |
95 | #ifdef CONFIG_PM_RUNTIME |
96 | ||
97 | static int scsi_runtime_suspend(struct device *dev) | |
98 | { | |
99 | int err = 0; | |
100 | ||
101 | dev_dbg(dev, "scsi_runtime_suspend\n"); | |
102 | if (scsi_is_sdev_device(dev)) { | |
103 | err = scsi_dev_type_suspend(dev, PMSG_AUTO_SUSPEND); | |
104 | if (err == -EAGAIN) | |
105 | pm_schedule_suspend(dev, jiffies_to_msecs( | |
106 | round_jiffies_up_relative(HZ/10))); | |
107 | } | |
108 | ||
109 | /* Insert hooks here for targets, hosts, and transport classes */ | |
110 | ||
111 | return err; | |
112 | } | |
113 | ||
114 | static int scsi_runtime_resume(struct device *dev) | |
115 | { | |
116 | int err = 0; | |
117 | ||
118 | dev_dbg(dev, "scsi_runtime_resume\n"); | |
119 | if (scsi_is_sdev_device(dev)) | |
120 | err = scsi_dev_type_resume(dev); | |
121 | ||
122 | /* Insert hooks here for targets, hosts, and transport classes */ | |
123 | ||
124 | return err; | |
125 | } | |
126 | ||
127 | static int scsi_runtime_idle(struct device *dev) | |
128 | { | |
129 | int err; | |
130 | ||
131 | dev_dbg(dev, "scsi_runtime_idle\n"); | |
132 | ||
133 | /* Insert hooks here for targets, hosts, and transport classes */ | |
134 | ||
135 | if (scsi_is_sdev_device(dev)) | |
136 | err = pm_schedule_suspend(dev, 100); | |
137 | else | |
138 | err = pm_runtime_suspend(dev); | |
139 | return err; | |
140 | } | |
141 | ||
142 | int scsi_autopm_get_device(struct scsi_device *sdev) | |
143 | { | |
144 | int err; | |
145 | ||
146 | err = pm_runtime_get_sync(&sdev->sdev_gendev); | |
147 | if (err < 0) | |
148 | pm_runtime_put_sync(&sdev->sdev_gendev); | |
149 | else if (err > 0) | |
150 | err = 0; | |
151 | return err; | |
152 | } | |
153 | EXPORT_SYMBOL_GPL(scsi_autopm_get_device); | |
154 | ||
155 | void scsi_autopm_put_device(struct scsi_device *sdev) | |
156 | { | |
157 | pm_runtime_put_sync(&sdev->sdev_gendev); | |
158 | } | |
159 | EXPORT_SYMBOL_GPL(scsi_autopm_put_device); | |
160 | ||
161 | void scsi_autopm_get_target(struct scsi_target *starget) | |
162 | { | |
163 | pm_runtime_get_sync(&starget->dev); | |
164 | } | |
165 | ||
166 | void scsi_autopm_put_target(struct scsi_target *starget) | |
167 | { | |
168 | pm_runtime_put_sync(&starget->dev); | |
169 | } | |
170 | ||
171 | int scsi_autopm_get_host(struct Scsi_Host *shost) | |
172 | { | |
173 | int err; | |
174 | ||
175 | err = pm_runtime_get_sync(&shost->shost_gendev); | |
176 | if (err < 0) | |
177 | pm_runtime_put_sync(&shost->shost_gendev); | |
178 | else if (err > 0) | |
179 | err = 0; | |
180 | return err; | |
181 | } | |
182 | ||
183 | void scsi_autopm_put_host(struct Scsi_Host *shost) | |
184 | { | |
185 | pm_runtime_put_sync(&shost->shost_gendev); | |
186 | } | |
187 | ||
188 | #else | |
189 | ||
190 | #define scsi_runtime_suspend NULL | |
191 | #define scsi_runtime_resume NULL | |
192 | #define scsi_runtime_idle NULL | |
193 | ||
194 | #endif /* CONFIG_PM_RUNTIME */ | |
195 | ||
db5bd1e0 AS |
196 | const struct dev_pm_ops scsi_bus_pm_ops = { |
197 | .suspend = scsi_bus_suspend, | |
198 | .resume = scsi_bus_resume_common, | |
199 | .freeze = scsi_bus_freeze, | |
200 | .thaw = scsi_bus_resume_common, | |
201 | .poweroff = scsi_bus_poweroff, | |
202 | .restore = scsi_bus_resume_common, | |
bc4f2401 AS |
203 | .runtime_suspend = scsi_runtime_suspend, |
204 | .runtime_resume = scsi_runtime_resume, | |
205 | .runtime_idle = scsi_runtime_idle, | |
db5bd1e0 | 206 | }; |