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Subject[PATCH 3.18 31/83] Input: xpad - move the input device creation to a new function
Date
3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit b8154002cbdfde1aed2f86bd27f5e2c7e832cabb ]

To allow us to later create / destroy the input device from the urb
callback, we need to initialize/ deinitialize the input device from a
separate function. So pull that logic out now to make later patches
more "obvious" as to what they do.

Signed-off-by: "Pierre-Loup A. Griffais" <pgriffais@valvesoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Pavel Rojtberg <rojtberg@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/input/joystick/xpad.c | 217 +++++++++++++++++++---------------
1 file changed, 122 insertions(+), 95 deletions(-)

diff --git a/drivers/input/joystick/xpad.c b/drivers/input/joystick/xpad.c
index f6e96741ff0e..652efb284e09 100644
--- a/drivers/input/joystick/xpad.c
+++ b/drivers/input/joystick/xpad.c
@@ -344,6 +344,7 @@ struct usb_xpad {
int mapping; /* map d-pad to buttons or to axes */
int xtype; /* type of xbox device */
int pad_nr; /* the order x360 pads were attached */
+ const char *name; /* name of the device */
};

/*
@@ -1062,94 +1063,36 @@ static void xpad_set_up_abs(struct input_dev *input_dev, signed short abs)
}
}

-static int xpad_probe(struct usb_interface *intf, const struct usb_device_id *id)
+static void xpad_deinit_input(struct usb_xpad *xpad)
+{
+ xpad_led_disconnect(xpad);
+ input_unregister_device(xpad->dev);
+}
+
+static int xpad_init_input(struct usb_xpad *xpad)
{
- struct usb_device *udev = interface_to_usbdev(intf);
- struct usb_xpad *xpad;
struct input_dev *input_dev;
- struct usb_endpoint_descriptor *ep_irq_in;
- int ep_irq_in_idx;
int i, error;

- if (intf->cur_altsetting->desc.bNumEndpoints != 2)
- return -ENODEV;
-
- for (i = 0; xpad_device[i].idVendor; i++) {
- if ((le16_to_cpu(udev->descriptor.idVendor) == xpad_device[i].idVendor) &&
- (le16_to_cpu(udev->descriptor.idProduct) == xpad_device[i].idProduct))
- break;
- }
-
- if (xpad_device[i].xtype == XTYPE_XBOXONE &&
- intf->cur_altsetting->desc.bInterfaceNumber != 0) {
- /*
- * The Xbox One controller lists three interfaces all with the
- * same interface class, subclass and protocol. Differentiate by
- * interface number.
- */
- return -ENODEV;
- }
-
- xpad = kzalloc(sizeof(struct usb_xpad), GFP_KERNEL);
input_dev = input_allocate_device();
- if (!xpad || !input_dev) {
- error = -ENOMEM;
- goto fail1;
- }
-
- xpad->idata = usb_alloc_coherent(udev, XPAD_PKT_LEN,
- GFP_KERNEL, &xpad->idata_dma);
- if (!xpad->idata) {
- error = -ENOMEM;
- goto fail1;
- }
-
- xpad->irq_in = usb_alloc_urb(0, GFP_KERNEL);
- if (!xpad->irq_in) {
- error = -ENOMEM;
- goto fail2;
- }
-
- xpad->udev = udev;
- xpad->intf = intf;
- xpad->mapping = xpad_device[i].mapping;
- xpad->xtype = xpad_device[i].xtype;
-
- if (xpad->xtype == XTYPE_UNKNOWN) {
- if (intf->cur_altsetting->desc.bInterfaceClass == USB_CLASS_VENDOR_SPEC) {
- if (intf->cur_altsetting->desc.bInterfaceProtocol == 129)
- xpad->xtype = XTYPE_XBOX360W;
- else
- xpad->xtype = XTYPE_XBOX360;
- } else
- xpad->xtype = XTYPE_XBOX;
-
- if (dpad_to_buttons)
- xpad->mapping |= MAP_DPAD_TO_BUTTONS;
- if (triggers_to_buttons)
- xpad->mapping |= MAP_TRIGGERS_TO_BUTTONS;
- if (sticks_to_null)
- xpad->mapping |= MAP_STICKS_TO_NULL;
- }
+ if (!input_dev)
+ return -ENOMEM;

xpad->dev = input_dev;
- usb_make_path(udev, xpad->phys, sizeof(xpad->phys));
- strlcat(xpad->phys, "/input0", sizeof(xpad->phys));
-
- input_dev->name = xpad_device[i].name;
+ input_dev->name = xpad->name;
input_dev->phys = xpad->phys;
- usb_to_input_id(udev, &input_dev->id);
- input_dev->dev.parent = &intf->dev;
+ usb_to_input_id(xpad->udev, &input_dev->id);
+ input_dev->dev.parent = &xpad->intf->dev;

input_set_drvdata(input_dev, xpad);

input_dev->open = xpad_open;
input_dev->close = xpad_close;

- input_dev->evbit[0] = BIT_MASK(EV_KEY);
+ __set_bit(EV_KEY, input_dev->evbit);

if (!(xpad->mapping & MAP_STICKS_TO_NULL)) {
- input_dev->evbit[0] |= BIT_MASK(EV_ABS);
+ __set_bit(EV_ABS, input_dev->evbit);
/* set up axes */
for (i = 0; xpad_abs[i] >= 0; i++)
xpad_set_up_abs(input_dev, xpad_abs[i]);
@@ -1194,17 +1137,103 @@ static int xpad_probe(struct usb_interface *intf, const struct usb_device_id *id
xpad_set_up_abs(input_dev, xpad_abs_triggers[i]);
}

- error = xpad_init_output(intf, xpad);
- if (error)
- goto fail3;
-
error = xpad_init_ff(xpad);
if (error)
- goto fail4;
+ goto err_free_input;

error = xpad_led_probe(xpad);
if (error)
- goto fail5;
+ goto err_destroy_ff;
+
+ error = input_register_device(xpad->dev);
+ if (error)
+ goto err_disconnect_led;
+
+ return 0;
+
+err_disconnect_led:
+ xpad_led_disconnect(xpad);
+err_destroy_ff:
+ input_ff_destroy(input_dev);
+err_free_input:
+ input_free_device(input_dev);
+ return error;
+}
+
+static int xpad_probe(struct usb_interface *intf, const struct usb_device_id *id)
+{
+ struct usb_device *udev = interface_to_usbdev(intf);
+ struct usb_xpad *xpad;
+ struct usb_endpoint_descriptor *ep_irq_in;
+ int ep_irq_in_idx;
+ int i, error;
+
+ if (intf->cur_altsetting->desc.bNumEndpoints != 2)
+ return -ENODEV;
+
+ for (i = 0; xpad_device[i].idVendor; i++) {
+ if ((le16_to_cpu(udev->descriptor.idVendor) == xpad_device[i].idVendor) &&
+ (le16_to_cpu(udev->descriptor.idProduct) == xpad_device[i].idProduct))
+ break;
+ }
+
+ if (xpad_device[i].xtype == XTYPE_XBOXONE &&
+ intf->cur_altsetting->desc.bInterfaceNumber != 0) {
+ /*
+ * The Xbox One controller lists three interfaces all with the
+ * same interface class, subclass and protocol. Differentiate by
+ * interface number.
+ */
+ return -ENODEV;
+ }
+
+ xpad = kzalloc(sizeof(struct usb_xpad), GFP_KERNEL);
+ if (!xpad)
+ return -ENOMEM;
+
+ usb_make_path(udev, xpad->phys, sizeof(xpad->phys));
+ strlcat(xpad->phys, "/input0", sizeof(xpad->phys));
+
+ xpad->idata = usb_alloc_coherent(udev, XPAD_PKT_LEN,
+ GFP_KERNEL, &xpad->idata_dma);
+ if (!xpad->idata) {
+ error = -ENOMEM;
+ goto err_free_mem;
+ }
+
+ xpad->irq_in = usb_alloc_urb(0, GFP_KERNEL);
+ if (!xpad->irq_in) {
+ error = -ENOMEM;
+ goto err_free_idata;
+ }
+
+ xpad->udev = udev;
+ xpad->intf = intf;
+ xpad->mapping = xpad_device[i].mapping;
+ xpad->xtype = xpad_device[i].xtype;
+ xpad->name = xpad_device[i].name;
+
+ if (xpad->xtype == XTYPE_UNKNOWN) {
+ if (intf->cur_altsetting->desc.bInterfaceClass == USB_CLASS_VENDOR_SPEC) {
+ if (intf->cur_altsetting->desc.bInterfaceProtocol == 129)
+ xpad->xtype = XTYPE_XBOX360W;
+ else
+ xpad->xtype = XTYPE_XBOX360;
+ } else {
+ xpad->xtype = XTYPE_XBOX;
+ }
+
+ if (dpad_to_buttons)
+ xpad->mapping |= MAP_DPAD_TO_BUTTONS;
+ if (triggers_to_buttons)
+ xpad->mapping |= MAP_TRIGGERS_TO_BUTTONS;
+ if (sticks_to_null)
+ xpad->mapping |= MAP_STICKS_TO_NULL;
+ }
+
+ error = xpad_init_output(intf, xpad);
+ if (error)
+ goto err_free_in_urb;

/* Xbox One controller has in/out endpoints swapped. */
ep_irq_in_idx = xpad->xtype == XTYPE_XBOXONE ? 1 : 0;
@@ -1217,12 +1246,12 @@ static int xpad_probe(struct usb_interface *intf, const struct usb_device_id *id
xpad->irq_in->transfer_dma = xpad->idata_dma;
xpad->irq_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

- error = input_register_device(xpad->dev);
- if (error)
- goto fail6;
-
usb_set_intfdata(intf, xpad);

+ error = xpad_init_input(xpad);
+ if (error)
+ goto err_deinit_output;
+
if (xpad->xtype == XTYPE_XBOX360W) {
/*
* Submit the int URB immediately rather than waiting for open
@@ -1234,20 +1263,19 @@ static int xpad_probe(struct usb_interface *intf, const struct usb_device_id *id
xpad->irq_in->dev = xpad->udev;
error = usb_submit_urb(xpad->irq_in, GFP_KERNEL);
if (error)
- goto fail7;
+ goto err_deinit_input;
}
-
return 0;

- fail7: input_unregister_device(input_dev);
- input_dev = NULL;
- fail6: xpad_led_disconnect(xpad);
- fail5: if (input_dev)
- input_ff_destroy(input_dev);
- fail4: xpad_deinit_output(xpad);
- fail3: usb_free_urb(xpad->irq_in);
- fail2: usb_free_coherent(udev, XPAD_PKT_LEN, xpad->idata, xpad->idata_dma);
- fail1: input_free_device(input_dev);
+err_deinit_input:
+ xpad_deinit_input(xpad);
+err_deinit_output:
+ xpad_deinit_output(xpad);
+err_free_in_urb:
+ usb_free_urb(xpad->irq_in);
+err_free_idata:
+ usb_free_coherent(udev, XPAD_PKT_LEN, xpad->idata, xpad->idata_dma);
+err_free_mem:
kfree(xpad);
return error;

@@ -1257,8 +1285,7 @@ static void xpad_disconnect(struct usb_interface *intf)
{
struct usb_xpad *xpad = usb_get_intfdata (intf);

- xpad_led_disconnect(xpad);
- input_unregister_device(xpad->dev);
+ xpad_deinit_input(xpad);
xpad_deinit_output(xpad);

if (xpad->xtype == XTYPE_XBOX360W) {
--
2.17.1


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