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HID: logitech-dj: rely on hid groups to separate receivers from dj devices 

Several benefits here:
- we can drop the macro is_dj_device: I never been really conviced by
  this macro as we could fall into a null pointer anytime. Anyway time
  showed that this never happened.
- we can simplify the hid driver logitech-djdevice, and make it aware
  of any new receiver VID/PID.
- we can use the Wireless PID of the DJ device as the product id of the
  hid device, this way the sysfs will differentiate between different
  DJ devices.

Signed-off-by: Benjamin Tisssoires <benjamin.tissoires@redhat.com>
Tested-by: Andrew de los Reyes <adlr@chromium.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires 2014-09-30 13:18:25 -04:00 committed by Jiri Kosina
parent 9578f41aea
commit d610274b03
3 changed files with 11 additions and 38 deletions
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38
drivers/hid/hid-logitech-dj.c
View File

@ -256,11 +256,15 @@ static void logi_dj_recv_add_djhid_device(struct dj_receiver_dev *djrcv_dev,
dj_hiddev->dev.parent = &djrcv_hdev->dev;
dj_hiddev->bus = BUS_USB;
dj_hiddev->vendor = le16_to_cpu(usbdev->descriptor.idVendor);
dj_hiddev->product = le16_to_cpu(usbdev->descriptor.idProduct);
dj_hiddev->product =
(dj_report->report_params[DEVICE_PAIRED_PARAM_EQUAD_ID_MSB]
<< 8) |
dj_report->report_params[DEVICE_PAIRED_PARAM_EQUAD_ID_LSB];
snprintf(dj_hiddev->name, sizeof(dj_hiddev->name),
"Logitech Unifying Device. Wireless PID:%02x%02x",
dj_report->report_params[DEVICE_PAIRED_PARAM_EQUAD_ID_MSB],
dj_report->report_params[DEVICE_PAIRED_PARAM_EQUAD_ID_LSB]);
"Logitech Unifying Device. Wireless PID:%04x",
dj_hiddev->product);
dj_hiddev->group = HID_GROUP_LOGITECH_DJ_DEVICE;
usb_make_path(usbdev, dj_hiddev->phys, sizeof(dj_hiddev->phys));
snprintf(tmpstr, sizeof(tmpstr), ":%d", dj_report->device_index);
@ -714,9 +718,6 @@ static int logi_dj_probe(struct hid_device *hdev,
struct dj_receiver_dev *djrcv_dev;
int retval;
if (is_dj_device((struct dj_device *)hdev->driver_data))
return -ENODEV;
dbg_hid("%s called for ifnum %d\n", __func__,
intf->cur_altsetting->desc.bInterfaceNumber);
@ -869,22 +870,6 @@ static void logi_dj_remove(struct hid_device *hdev)
hid_set_drvdata(hdev, NULL);
}
static int logi_djdevice_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
int ret;
struct dj_device *dj_dev = hdev->driver_data;
if (!is_dj_device(dj_dev))
return -ENODEV;
ret = hid_parse(hdev);
if (!ret)
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
return ret;
}
static const struct hid_device_id logi_dj_receivers[] = {
{HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER)},
@ -908,17 +893,14 @@ static struct hid_driver logi_djreceiver_driver = {
static const struct hid_device_id logi_dj_devices[] = {
{HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER)},
{HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER_2)},
{ HID_DEVICE(BUS_USB, HID_GROUP_LOGITECH_DJ_DEVICE,
USB_VENDOR_ID_LOGITECH, HID_ANY_ID)},
{}
};
static struct hid_driver logi_djdevice_driver = {
.name = "logitech-djdevice",
.id_table = logi_dj_devices,
.probe = logi_djdevice_probe,
};

10
drivers/hid/hid-logitech-dj.h
View File

@ -112,14 +112,4 @@ struct dj_device {
u8 device_index;
};
/**
* is_dj_device - know if the given dj_device is not the receiver.
* @dj_dev: the dj device to test
*
* This macro tests if a struct dj_device pointer is a device created
* by the bus enumarator.
*/
#define is_dj_device(dj_dev) \
(&(dj_dev)->dj_receiver_dev->hdev->dev == (dj_dev)->hdev->dev.parent)
#endif

1
include/linux/hid.h
View File

@ -313,6 +313,7 @@ struct hid_item {
*/
#define HID_GROUP_RMI 0x0100
#define HID_GROUP_WACOM 0x0101
#define HID_GROUP_LOGITECH_DJ_DEVICE 0x0102
/*
* This is the global environment of the parser. This information is