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Commit f47cd136 authored by Bjørn Mork's avatar Bjørn Mork Committed by David S. Miller
Browse files

net: qmi_wwan: rearranging to prepare for code sharing 



Most of the subdriver registration code can be reused for devices
with separate control and data interfaces.  Move the code a bit
around to prepare for such reuse.

Signed-off-by: default avatarBjørn Mork <bjorn@mork.no>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 853c24f7

drivers/net/usb/qmi_wwan.c

+76 −52
Original line number Diff line number Diff line
@@ -58,9 +58,80 @@ 
struct qmi_wwan_state {

	struct usb_driver *subdriver;

	atomic_t pmcount;

	unsigned long unused[3];

	unsigned long unused;

	struct usb_interface *control;

	struct usb_interface *data;

};



/* using a counter to merge subdriver requests with our own into a combined state */

static int qmi_wwan_manage_power(struct usbnet *dev, int on)

{

	struct qmi_wwan_state *info = (void *)&dev->data;

	int rv = 0;



	dev_dbg(&dev->intf->dev, "%s() pmcount=%d, on=%d\n", __func__, atomic_read(&info->pmcount), on);



	if ((on && atomic_add_return(1, &info->pmcount) == 1) || (!on && atomic_dec_and_test(&info->pmcount))) {

		/* need autopm_get/put here to ensure the usbcore sees the new value */

		rv = usb_autopm_get_interface(dev->intf);

		if (rv < 0)

			goto err;

		dev->intf->needs_remote_wakeup = on;

		usb_autopm_put_interface(dev->intf);

	}

err:

	return rv;

}



static int qmi_wwan_cdc_wdm_manage_power(struct usb_interface *intf, int on)

{

	struct usbnet *dev = usb_get_intfdata(intf);

	return qmi_wwan_manage_power(dev, on);

}



/* collect all three endpoints and register subdriver */

static int qmi_wwan_register_subdriver(struct usbnet *dev)

{

	int rv;

	struct usb_driver *subdriver = NULL;

	struct qmi_wwan_state *info = (void *)&dev->data;



	/* collect bulk endpoints */

	rv = usbnet_get_endpoints(dev, info->data);

	if (rv < 0)

		goto err;



	/* update status endpoint if separate control interface */

	if (info->control != info->data)

		dev->status = &info->control->cur_altsetting->endpoint[0];



	/* require interrupt endpoint for subdriver */

	if (!dev->status) {

		rv = -EINVAL;

		goto err;

	}



	/* for subdriver power management */

	atomic_set(&info->pmcount, 0);



	/* register subdriver */

	subdriver = usb_cdc_wdm_register(info->control, &dev->status->desc, 512, &qmi_wwan_cdc_wdm_manage_power);

	if (IS_ERR(subdriver)) {

		dev_err(&info->control->dev, "subdriver registration failed\n");

		rv = PTR_ERR(subdriver);

		goto err;

	}



	/* prevent usbnet from using status endpoint */

	dev->status = NULL;



	/* save subdriver struct for suspend/resume wrappers */

	info->subdriver = subdriver;



err:

	return rv;

}



static int qmi_wwan_bind(struct usbnet *dev, struct usb_interface *intf)

{

	int status = -1;
@@ -183,32 +254,6 @@ static int qmi_wwan_bind(struct usbnet *dev, struct usb_interface *intf) 
	return status;

}



/* using a counter to merge subdriver requests with our own into a combined state */

static int qmi_wwan_manage_power(struct usbnet *dev, int on)

{

	struct qmi_wwan_state *info = (void *)&dev->data;

	int rv = 0;



	dev_dbg(&dev->intf->dev, "%s() pmcount=%d, on=%d\n", __func__, atomic_read(&info->pmcount), on);



	if ((on && atomic_add_return(1, &info->pmcount) == 1) || (!on && atomic_dec_and_test(&info->pmcount))) {

		/* need autopm_get/put here to ensure the usbcore sees the new value */

		rv = usb_autopm_get_interface(dev->intf);

		if (rv < 0)

			goto err;

		dev->intf->needs_remote_wakeup = on;

		usb_autopm_put_interface(dev->intf);

	}

err:

	return rv;

}



static int qmi_wwan_cdc_wdm_manage_power(struct usb_interface *intf, int on)

{

	struct usbnet *dev = usb_get_intfdata(intf);

	return qmi_wwan_manage_power(dev, on);

}



/* Some devices combine the "control" and "data" functions into a

 * single interface with all three endpoints: interrupt + bulk in and

 * out
@@ -220,7 +265,6 @@ static int qmi_wwan_cdc_wdm_manage_power(struct usb_interface *intf, int on) 
static int qmi_wwan_bind_shared(struct usbnet *dev, struct usb_interface *intf)

{

	int rv;

	struct usb_driver *subdriver = NULL;

	struct qmi_wwan_state *info = (void *)&dev->data;



	/* ZTE makes devices where the interface descriptors and endpoint
@@ -237,30 +281,10 @@ static int qmi_wwan_bind_shared(struct usbnet *dev, struct usb_interface *intf) 
		goto err;

	}



	atomic_set(&info->pmcount, 0);



	/* collect all three endpoints */

	rv = usbnet_get_endpoints(dev, intf);

	if (rv < 0)

		goto err;



	/* require interrupt endpoint for subdriver */

	if (!dev->status) {

		rv = -EINVAL;

		goto err;

	}



	subdriver = usb_cdc_wdm_register(intf, &dev->status->desc, 512, &qmi_wwan_cdc_wdm_manage_power);

	if (IS_ERR(subdriver)) {

		rv = PTR_ERR(subdriver);

		goto err;

	}



	/* can't let usbnet use the interrupt endpoint */

	dev->status = NULL;



	/* save subdriver struct for suspend/resume wrappers */

	info->subdriver = subdriver;

	/*  control and data is shared */

	info->control = intf;

	info->data = intf;

	rv = qmi_wwan_register_subdriver(dev);



err:

	return rv;