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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 455 | giacomo | 1 | /* |
| 2 | * drivers/base/interface.c - common driverfs interface that's exported to |
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| 3 | * the world for all devices. |
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| 4 | * |
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| 5 | * Copyright (c) 2002-3 Patrick Mochel |
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| 6 | * Copyright (c) 2002-3 Open Source Development Labs |
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| 7 | * |
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| 8 | * This file is released under the GPLv2 |
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| 9 | * |
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| 10 | */ |
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| 11 | |||
| 12 | #include <linuxcomp.h> |
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| 13 | |||
| 14 | #include <linux/device.h> |
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| 15 | #include <linux/err.h> |
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| 16 | #include <linux/stat.h> |
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| 17 | #include <linux/string.h> |
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| 18 | |||
| 19 | /** |
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| 20 | * detach_state - control the default power state for the device. |
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| 21 | * |
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| 22 | * This is the state the device enters when it's driver module is |
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| 23 | * unloaded. The value is an unsigned integer, in the range of 0-4. |
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| 24 | * '0' indicates 'On', so no action will be taken when the driver is |
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| 25 | * unloaded. This is the default behavior. |
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| 26 | * '4' indicates 'Off', meaning the driver core will call the driver's |
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| 27 | * shutdown method to quiesce the device. |
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| 28 | * 1-3 indicate a low-power state for the device to enter via the |
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| 29 | * driver's suspend method. |
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| 30 | */ |
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| 31 | |||
| 32 | static ssize_t detach_show(struct device * dev, char * buf) |
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| 33 | { |
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| 34 | return sprintf26(buf,"%u\n",dev->detach_state); |
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| 35 | } |
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| 36 | |||
| 37 | static ssize_t detach_store(struct device * dev, const char * buf, size_t n) |
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| 38 | { |
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| 39 | u32 state; |
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| 40 | state = simple_strtoul(buf,NULL,10); |
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| 41 | if (state > 4) |
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| 42 | return -EINVAL; |
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| 43 | dev->detach_state = state; |
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| 44 | return n; |
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| 45 | } |
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| 46 | |||
| 47 | static DEVICE_ATTR(detach_state,0644,detach_show,detach_store); |
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| 48 | |||
| 49 | |||
| 50 | struct attribute * dev_default_attrs[] = { |
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| 51 | &dev_attr_detach_state.attr, |
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| 52 | NULL, |
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| 53 | }; |