i2c-core: i2c bus should support PM entries in struct dev_pm_ops
Struct dev_pm_ops is not configured in current i2c bus type. i2c drivers only depends on suspend/resume entries in struct dev_pm_ops are not informed of PM suspend and resume events by i2c framework. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
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@ -155,6 +155,35 @@ static void i2c_device_shutdown(struct device *dev)
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driver->shutdown(client);
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}
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#ifdef CONFIG_SUSPEND
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static int i2c_device_pm_suspend(struct device *dev)
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{
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const struct dev_pm_ops *pm;
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if (!dev->driver)
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return 0;
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pm = dev->driver->pm;
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if (!pm || !pm->suspend)
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return 0;
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return pm->suspend(dev);
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}
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static int i2c_device_pm_resume(struct device *dev)
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{
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const struct dev_pm_ops *pm;
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if (!dev->driver)
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return 0;
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pm = dev->driver->pm;
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if (!pm || !pm->resume)
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return 0;
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return pm->resume(dev);
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}
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#else
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#define i2c_device_pm_suspend NULL
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#define i2c_device_pm_resume NULL
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#endif
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static int i2c_device_suspend(struct device *dev, pm_message_t mesg)
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{
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struct i2c_client *client = i2c_verify_client(dev);
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@ -219,6 +248,11 @@ static const struct attribute_group *i2c_dev_attr_groups[] = {
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NULL
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};
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const static struct dev_pm_ops i2c_device_pm_ops = {
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.suspend = i2c_device_pm_suspend,
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.resume = i2c_device_pm_resume,
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};
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struct bus_type i2c_bus_type = {
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.name = "i2c",
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.match = i2c_device_match,
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@ -227,6 +261,7 @@ struct bus_type i2c_bus_type = {
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.shutdown = i2c_device_shutdown,
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.suspend = i2c_device_suspend,
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.resume = i2c_device_resume,
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.pm = &i2c_device_pm_ops,
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};
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EXPORT_SYMBOL_GPL(i2c_bus_type);
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