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authorJason Gerecke <killertofu@gmail.com>2017-07-24 09:46:18 -0700
committerJiri Kosina <jkosina@suse.cz>2017-07-27 15:14:28 +0200
commitfc2237a724a9e448599076d7d23497f51e2f7441 (patch)
tree0f6fc077d1452bba1d2e690d08f6bef622f20919
parentbc35f73aa62f51b80f769d3a6617f4a4ba11d81e (diff)
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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>
-rw-r--r--drivers/hid/i2c-hid/i2c-hid.c3
-rw-r--r--drivers/hid/uhid.c3
-rw-r--r--drivers/hid/usbhid/hid-core.c3
-rw-r--r--include/linux/hid.h11
-rw-r--r--net/bluetooth/hidp/core.c3
5 files changed, 19 insertions, 4 deletions
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index 046f692fd0a2..77396145d2d0 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -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)
{
diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c
index 7f8ff39ed44b..6f819f144cb4 100644
--- a/drivers/hid/uhid.c
+++ b/drivers/hid/uhid.c
@@ -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
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 76013eb5cb7f..e1047ad0d59b 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -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)
{
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 5006f9b5d837..3853408daf7f 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -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
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 002743ea509c..8112893037bd 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -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(). */