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HID: introduce hid_is_using_ll_driver 

Although HID itself is transport-agnostic, occasionally a driver may
want to interact with the low-level transport that a device is connected
through. To do this, we need to know what kind of bus is in use. The
first guess may be to look at the 'bus' field of the 'struct hid_device',
but this field may be emulated in some cases (e.g. uhid).

More ideally, we can check which ll_driver a device is using. This
function introduces a 'hid_is_using_ll_driver' function and makes the
'struct hid_ll_driver' of the four most common transports accessible
through hid.h.

Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Acked-By: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
zero-colors
Jason Gerecke 2017-07-24 09:46:18 -07:00 committed by Jiri Kosina
parent bc35f73aa6
commit fc2237a724
5 changed files with 19 additions and 4 deletions
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3
drivers/hid/i2c-hid/i2c-hid.c
View File

@ -780,7 +780,7 @@ static int i2c_hid_power(struct hid_device *hid, int lvl)
return 0;
}
static struct hid_ll_driver i2c_hid_ll_driver = {
struct hid_ll_driver i2c_hid_ll_driver = {
.parse = i2c_hid_parse,
.start = i2c_hid_start,
.stop = i2c_hid_stop,
@ -790,6 +790,7 @@ static struct hid_ll_driver i2c_hid_ll_driver = {
.output_report = i2c_hid_output_report,
.raw_request = i2c_hid_raw_request,
};
EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);
static int i2c_hid_init_irq(struct i2c_client *client)
{

3
drivers/hid/uhid.c
View File

@ -369,7 +369,7 @@ static int uhid_hid_output_report(struct hid_device *hid, __u8 *buf,
return uhid_hid_output_raw(hid, buf, count, HID_OUTPUT_REPORT);
}
static struct hid_ll_driver uhid_hid_driver = {
struct hid_ll_driver uhid_hid_driver = {
.start = uhid_hid_start,
.stop = uhid_hid_stop,
.open = uhid_hid_open,
@ -378,6 +378,7 @@ static struct hid_ll_driver uhid_hid_driver = {
.raw_request = uhid_hid_raw_request,
.output_report = uhid_hid_output_report,
};
EXPORT_SYMBOL_GPL(uhid_hid_driver);
#ifdef CONFIG_COMPAT

3
drivers/hid/usbhid/hid-core.c
View File

@ -1261,7 +1261,7 @@ static int usbhid_idle(struct hid_device *hid, int report, int idle,
return hid_set_idle(dev, ifnum, report, idle);
}
static struct hid_ll_driver usb_hid_driver = {
struct hid_ll_driver usb_hid_driver = {
.parse = usbhid_parse,
.start = usbhid_start,
.stop = usbhid_stop,
@ -1274,6 +1274,7 @@ static struct hid_ll_driver usb_hid_driver = {
.output_report = usbhid_output_report,
.idle = usbhid_idle,
};
EXPORT_SYMBOL_GPL(usb_hid_driver);
static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *id)
{

11
include/linux/hid.h
View File

@ -777,6 +777,17 @@ struct hid_ll_driver {
int (*idle)(struct hid_device *hdev, int report, int idle, int reqtype);
};
extern struct hid_ll_driver i2c_hid_ll_driver;
extern struct hid_ll_driver hidp_hid_driver;
extern struct hid_ll_driver uhid_hid_driver;
extern struct hid_ll_driver usb_hid_driver;
static inline bool hid_is_using_ll_driver(struct hid_device *hdev,
struct hid_ll_driver *driver)
{
return hdev->ll_driver == driver;
}
#define PM_HINT_FULLON 1<<5
#define PM_HINT_NORMAL 1<<1

3
net/bluetooth/hidp/core.c
View File

@ -734,7 +734,7 @@ static void hidp_stop(struct hid_device *hid)
hid->claimed = 0;
}
static struct hid_ll_driver hidp_hid_driver = {
struct hid_ll_driver hidp_hid_driver = {
.parse = hidp_parse,
.start = hidp_start,
.stop = hidp_stop,
@ -743,6 +743,7 @@ static struct hid_ll_driver hidp_hid_driver = {
.raw_request = hidp_raw_request,
.output_report = hidp_output_report,
};
EXPORT_SYMBOL_GPL(hidp_hid_driver);
/* This function sets up the hid device. It does not add it
to the HID system. That is done in hidp_add_connection(). */