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Lines 807-812
int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
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| 807 |
if (!device || !state) |
807 |
if (!device || !state) |
| 808 |
return -EINVAL; |
808 |
return -EINVAL; |
| 809 |
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809 |
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810 |
/* |
| 811 |
* Some devices do not have a power-resource-list for D0, but do |
| 812 |
* have a power-resource-lists for e.g. D3 so we do end up here. |
| 813 |
* In this case we can never infer that the device is in D0 even |
| 814 |
* though it might very well be in D0, so return ACPI_STATE_UNKNOWN. |
| 815 |
*/ |
| 816 |
if (list_empty(&device->power.states[ACPI_STATE_D0].resources)) { |
| 817 |
*state = ACPI_STATE_UNKNOWN; |
| 818 |
return 0; |
| 819 |
} |
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| 810 |
/* |
821 |
/* |
| 811 |
* We know a device's inferred power state when all the resources |
822 |
* We know a device's inferred power state when all the resources |
| 812 |
* required for a given D-state are 'on'. |
823 |
* required for a given D-state are 'on'. |
| 813 |
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