2 * scsi_pm.c Copyright (C) 2010 Alan Stern
4 * SCSI dynamic Power Management
5 * Initial version: Alan Stern <stern@rowland.harvard.edu>
8 #include <linux/pm_runtime.h>
10 #include <scsi/scsi.h>
11 #include <scsi/scsi_device.h>
12 #include <scsi/scsi_driver.h>
13 #include <scsi/scsi_host.h>
15 #include "scsi_priv.h"
17 static int scsi_dev_type_suspend(struct device *dev, pm_message_t msg)
19 struct device_driver *drv;
22 err = scsi_device_quiesce(to_scsi_device(dev));
25 if (drv && drv->suspend)
26 err = drv->suspend(dev, msg);
28 dev_dbg(dev, "scsi suspend: %d\n", err);
32 static int scsi_dev_type_resume(struct device *dev)
34 struct device_driver *drv;
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);
45 #ifdef CONFIG_PM_SLEEP
47 static int scsi_bus_suspend_common(struct device *dev, pm_message_t msg)
51 if (scsi_is_sdev_device(dev))
52 err = scsi_dev_type_suspend(dev, msg);
56 static int scsi_bus_resume_common(struct device *dev)
60 if (scsi_is_sdev_device(dev))
61 err = scsi_dev_type_resume(dev);
64 pm_runtime_disable(dev);
65 pm_runtime_set_active(dev);
66 pm_runtime_enable(dev);
71 static int scsi_bus_suspend(struct device *dev)
73 return scsi_bus_suspend_common(dev, PMSG_SUSPEND);
76 static int scsi_bus_freeze(struct device *dev)
78 return scsi_bus_suspend_common(dev, PMSG_FREEZE);
81 static int scsi_bus_poweroff(struct device *dev)
83 return scsi_bus_suspend_common(dev, PMSG_HIBERNATE);
86 #else /* CONFIG_PM_SLEEP */
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
93 #endif /* CONFIG_PM_SLEEP */
95 #ifdef CONFIG_PM_RUNTIME
97 static int scsi_runtime_suspend(struct device *dev)
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);
105 pm_schedule_suspend(dev, jiffies_to_msecs(
106 round_jiffies_up_relative(HZ/10)));
109 /* Insert hooks here for targets, hosts, and transport classes */
114 static int scsi_runtime_resume(struct device *dev)
118 dev_dbg(dev, "scsi_runtime_resume\n");
119 if (scsi_is_sdev_device(dev))
120 err = scsi_dev_type_resume(dev);
122 /* Insert hooks here for targets, hosts, and transport classes */
127 static int scsi_runtime_idle(struct device *dev)
131 dev_dbg(dev, "scsi_runtime_idle\n");
133 /* Insert hooks here for targets, hosts, and transport classes */
135 if (scsi_is_sdev_device(dev))
136 err = pm_schedule_suspend(dev, 100);
138 err = pm_runtime_suspend(dev);
142 int scsi_autopm_get_device(struct scsi_device *sdev)
146 err = pm_runtime_get_sync(&sdev->sdev_gendev);
148 pm_runtime_put_sync(&sdev->sdev_gendev);
153 EXPORT_SYMBOL_GPL(scsi_autopm_get_device);
155 void scsi_autopm_put_device(struct scsi_device *sdev)
157 pm_runtime_put_sync(&sdev->sdev_gendev);
159 EXPORT_SYMBOL_GPL(scsi_autopm_put_device);
161 void scsi_autopm_get_target(struct scsi_target *starget)
163 pm_runtime_get_sync(&starget->dev);
166 void scsi_autopm_put_target(struct scsi_target *starget)
168 pm_runtime_put_sync(&starget->dev);
171 int scsi_autopm_get_host(struct Scsi_Host *shost)
175 err = pm_runtime_get_sync(&shost->shost_gendev);
177 pm_runtime_put_sync(&shost->shost_gendev);
183 void scsi_autopm_put_host(struct Scsi_Host *shost)
185 pm_runtime_put_sync(&shost->shost_gendev);
190 #define scsi_runtime_suspend NULL
191 #define scsi_runtime_resume NULL
192 #define scsi_runtime_idle NULL
194 #endif /* CONFIG_PM_RUNTIME */
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,
203 .runtime_suspend = scsi_runtime_suspend,
204 .runtime_resume = scsi_runtime_resume,
205 .runtime_idle = scsi_runtime_idle,