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HID: Delay opening HID device

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Don't call hid_open_device till there is actually an user. This saves
power by not opening underlying transport for HID. Also close device
if there are no active mfd client using HID sensor hub.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Srinivas Pandruvada 2013-09-18 18:13:00 +01:00 • committed by Jonathan Cameron
parent de40d12098
commit 1df3a40115
2 changed files with 53 additions and 10 deletions
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18
include/linux/hid-sensor-hub.h
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@ -47,11 +47,13 @@ struct hid_sensor_hub_attribute_info {
* @hdev: Stores the hid instance.
* @vendor_id: Vendor id of hub device.
* @product_id: Product id of hub device.
* @ref_cnt: Number of MFD clients have opened this device
*/
struct hid_sensor_hub_device {
struct hid_device *hdev;
u32 vendor_id;
u32 product_id;
int ref_cnt;
};
/**
@ -74,6 +76,22 @@ struct hid_sensor_hub_callbacks {
void *priv);
};
/**
* sensor_hub_device_open() - Open hub device
* @hsdev: Hub device instance.
*
* Used to open hid device for sensor hub.
*/
int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev);
/**
* sensor_hub_device_clode() - Close hub device
* @hsdev: Hub device instance.
*
* Used to clode hid device for sensor hub.
*/
void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev);
/* Registration functions */
/**