usb-gigaset.c

来自「LINUX 2.6.17.4的源码」· C语言 代码 · 共 962 行 · 第 1/2 页

					  cb->buf + cb->offset, count,
					  gigaset_write_bulk_callback, cs);

			cb->offset += count;
			cb->len -= count;
			atomic_set(&ucs->busy, 1);

			spin_lock_irqsave(&cs->lock, flags);
			status = cs->connected ? usb_submit_urb(ucs->bulk_out_urb, SLAB_ATOMIC) : -ENODEV;
			spin_unlock_irqrestore(&cs->lock, flags);

			if (status) {
				atomic_set(&ucs->busy, 0);
				err("could not submit urb (error %d)\n",
				    -status);
				cb->len = 0; /* skip urb => remove cb+wakeup
						in next loop cycle */
			}
		}
	} while (cb && status); /* next command on error */

	return status;
}

/* Send command to device. */
static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf,
			     int len, struct tasklet_struct *wake_tasklet)
{
	struct cmdbuf_t *cb;
	unsigned long flags;

	gigaset_dbg_buffer(atomic_read(&cs->mstate) != MS_LOCKED ?
			     DEBUG_TRANSCMD : DEBUG_LOCKCMD,
			   "CMD Transmit", len, buf);

	if (len <= 0)
		return 0;

	if (!(cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC))) {
		dev_err(cs->dev, "%s: out of memory\n", __func__);
		return -ENOMEM;
	}

	memcpy(cb->buf, buf, len);
	cb->len = len;
	cb->offset = 0;
	cb->next = NULL;
	cb->wake_tasklet = wake_tasklet;

	spin_lock_irqsave(&cs->cmdlock, flags);
	cb->prev = cs->lastcmdbuf;
	if (cs->lastcmdbuf)
		cs->lastcmdbuf->next = cb;
	else {
		cs->cmdbuf = cb;
		cs->curlen = len;
	}
	cs->cmdbytes += len;
	cs->lastcmdbuf = cb;
	spin_unlock_irqrestore(&cs->cmdlock, flags);

	spin_lock_irqsave(&cs->lock, flags);
	if (cs->connected)
		tasklet_schedule(&cs->write_tasklet);
	spin_unlock_irqrestore(&cs->lock, flags);
	return len;
}

static int gigaset_write_room(struct cardstate *cs)
{
	unsigned long flags;
	unsigned bytes;

	spin_lock_irqsave(&cs->cmdlock, flags);
	bytes = cs->cmdbytes;
	spin_unlock_irqrestore(&cs->cmdlock, flags);

	return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0;
}

static int gigaset_chars_in_buffer(struct cardstate *cs)
{
	return cs->cmdbytes;
}

static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
{
#ifdef CONFIG_GIGASET_UNDOCREQ
	struct usb_device *udev = cs->hw.usb->udev;

	gigaset_dbg_buffer(DEBUG_USBREQ, "brkchars", 6, buf);
	memcpy(cs->hw.usb->bchars, buf, 6);
	return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x19, 0x41,
			       0, 0, &buf, 6, 2000);
#else
	return -EINVAL;
#endif
}

static int gigaset_freebcshw(struct bc_state *bcs)
{
	if (!bcs->hw.usb)
		return 0;
	//FIXME
	kfree(bcs->hw.usb);
	return 1;
}

/* Initialize the b-channel structure */
static int gigaset_initbcshw(struct bc_state *bcs)
{
	bcs->hw.usb = kmalloc(sizeof(struct usb_bc_state), GFP_KERNEL);
	if (!bcs->hw.usb)
		return 0;

	return 1;
}

static void gigaset_reinitbcshw(struct bc_state *bcs)
{
}

static void gigaset_freecshw(struct cardstate *cs)
{
	tasklet_kill(&cs->write_tasklet);
	kfree(cs->hw.usb);
}

static int gigaset_initcshw(struct cardstate *cs)
{
	struct usb_cardstate *ucs;

	cs->hw.usb = ucs =
		kmalloc(sizeof(struct usb_cardstate), GFP_KERNEL);
	if (!ucs)
		return 0;

	ucs->bchars[0] = 0;
	ucs->bchars[1] = 0;
	ucs->bchars[2] = 0;
	ucs->bchars[3] = 0;
	ucs->bchars[4] = 0x11;
	ucs->bchars[5] = 0x13;
	ucs->bulk_out_buffer = NULL;
	ucs->bulk_out_urb = NULL;
	//ucs->urb_cmd_out = NULL;
	ucs->read_urb = NULL;
	tasklet_init(&cs->write_tasklet,
		     &gigaset_modem_fill, (unsigned long) cs);

	return 1;
}

/* Send data from current skb to the device. */
static int write_modem(struct cardstate *cs)
{
	int ret = 0;
	int count;
	struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
	struct usb_cardstate *ucs = cs->hw.usb;
	unsigned long flags;

	gig_dbg(DEBUG_WRITE, "len: %d...", bcs->tx_skb->len);

	if (!bcs->tx_skb->len) {
		dev_kfree_skb_any(bcs->tx_skb);
		bcs->tx_skb = NULL;
		return -EINVAL;
	}

	/* Copy data to bulk out buffer and  // FIXME copying not necessary
	 * transmit data
	 */
	count = min(bcs->tx_skb->len, (unsigned) ucs->bulk_out_size);
	memcpy(ucs->bulk_out_buffer, bcs->tx_skb->data, count);
	skb_pull(bcs->tx_skb, count);
	atomic_set(&ucs->busy, 1);
	gig_dbg(DEBUG_OUTPUT, "write_modem: send %d bytes", count);

	spin_lock_irqsave(&cs->lock, flags);
	if (cs->connected) {
		usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev,
				  usb_sndbulkpipe(ucs->udev,
						  ucs->bulk_out_endpointAddr & 0x0f),
				  ucs->bulk_out_buffer, count,
				  gigaset_write_bulk_callback, cs);
		ret = usb_submit_urb(ucs->bulk_out_urb, SLAB_ATOMIC);
	} else {
		ret = -ENODEV;
	}
	spin_unlock_irqrestore(&cs->lock, flags);

	if (ret) {
		err("could not submit urb (error %d)\n", -ret);
		atomic_set(&ucs->busy, 0);
	}

	if (!bcs->tx_skb->len) {
		/* skb sent completely */
		gigaset_skb_sent(bcs, bcs->tx_skb); //FIXME also, when ret<0?

		gig_dbg(DEBUG_INTR, "kfree skb (Adr: %lx)!",
			(unsigned long) bcs->tx_skb);
		dev_kfree_skb_any(bcs->tx_skb);
		bcs->tx_skb = NULL;
	}

	return ret;
}

static int gigaset_probe(struct usb_interface *interface,
			 const struct usb_device_id *id)
{
	int retval;
	struct usb_device *udev = interface_to_usbdev(interface);
	unsigned int ifnum;
	struct usb_host_interface *hostif;
	struct cardstate *cs = NULL;
	struct usb_cardstate *ucs = NULL;
	struct usb_endpoint_descriptor *endpoint;
	int buffer_size;
	int alt;

	gig_dbg(DEBUG_ANY,
		"%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
		__func__, le16_to_cpu(udev->descriptor.idVendor),
		le16_to_cpu(udev->descriptor.idProduct));

	retval = -ENODEV; //FIXME

	/* See if the device offered us matches what we can accept */
	if ((le16_to_cpu(udev->descriptor.idVendor)  != USB_M105_VENDOR_ID) ||
	    (le16_to_cpu(udev->descriptor.idProduct) != USB_M105_PRODUCT_ID))
		return -ENODEV;

	/* this starts to become ascii art... */
	hostif = interface->cur_altsetting;
	alt = hostif->desc.bAlternateSetting;
	ifnum = hostif->desc.bInterfaceNumber; // FIXME ?

	if (alt != 0 || ifnum != 0) {
		dev_warn(&udev->dev, "ifnum %d, alt %d\n", ifnum, alt);
		return -ENODEV;
	}

	/* Reject application specific intefaces
	 *
	 */
	if (hostif->desc.bInterfaceClass != 255) {
		dev_info(&udev->dev,
		"%s: Device matched but iface_desc[%d]->bInterfaceClass==%d!\n",
			 __func__, ifnum, hostif->desc.bInterfaceClass);
		return -ENODEV;
	}

	dev_info(&udev->dev, "%s: Device matched ... !\n", __func__);

	cs = gigaset_getunassignedcs(driver);
	if (!cs) {
		dev_warn(&udev->dev, "no free cardstate\n");
		return -ENODEV;
	}
	ucs = cs->hw.usb;

	/* save off device structure ptrs for later use */
	usb_get_dev(udev);
	ucs->udev = udev;
	ucs->interface = interface;
	cs->dev = &interface->dev;

	/* save address of controller structure */
	usb_set_intfdata(interface, cs); // dev_set_drvdata(&interface->dev, cs);

	endpoint = &hostif->endpoint[0].desc;

	buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
	ucs->bulk_out_size = buffer_size;
	ucs->bulk_out_endpointAddr = endpoint->bEndpointAddress;
	ucs->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
	if (!ucs->bulk_out_buffer) {
		dev_err(cs->dev, "Couldn't allocate bulk_out_buffer\n");
		retval = -ENOMEM;
		goto error;
	}

	ucs->bulk_out_urb = usb_alloc_urb(0, SLAB_KERNEL);
	if (!ucs->bulk_out_urb) {
		dev_err(cs->dev, "Couldn't allocate bulk_out_urb\n");
		retval = -ENOMEM;
		goto error;
	}

	endpoint = &hostif->endpoint[1].desc;

	atomic_set(&ucs->busy, 0);

	ucs->read_urb = usb_alloc_urb(0, SLAB_KERNEL);
	if (!ucs->read_urb) {
		dev_err(cs->dev, "No free urbs available\n");
		retval = -ENOMEM;
		goto error;
	}
	buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
	ucs->rcvbuf_size = buffer_size;
	ucs->int_in_endpointAddr = endpoint->bEndpointAddress;
	cs->inbuf[0].rcvbuf = kmalloc(buffer_size, GFP_KERNEL);
	if (!cs->inbuf[0].rcvbuf) {
		dev_err(cs->dev, "Couldn't allocate rcvbuf\n");
		retval = -ENOMEM;
		goto error;
	}
	/* Fill the interrupt urb and send it to the core */
	usb_fill_int_urb(ucs->read_urb, udev,
			 usb_rcvintpipe(udev,
					endpoint->bEndpointAddress & 0x0f),
			 cs->inbuf[0].rcvbuf, buffer_size,
			 gigaset_read_int_callback,
			 cs->inbuf + 0, endpoint->bInterval);

	retval = usb_submit_urb(ucs->read_urb, SLAB_KERNEL);
	if (retval) {
		dev_err(cs->dev, "Could not submit URB (error %d)\n", -retval);
		goto error;
	}

	/* tell common part that the device is ready */
	if (startmode == SM_LOCKED)
		atomic_set(&cs->mstate, MS_LOCKED);

	if (!gigaset_start(cs)) {
		tasklet_kill(&cs->write_tasklet);
		retval = -ENODEV; //FIXME
		goto error;
	}
	return 0;

error:
	if (ucs->read_urb)
		usb_kill_urb(ucs->read_urb);
	kfree(ucs->bulk_out_buffer);
	if (ucs->bulk_out_urb != NULL)
		usb_free_urb(ucs->bulk_out_urb);
	kfree(cs->inbuf[0].rcvbuf);
	if (ucs->read_urb != NULL)
		usb_free_urb(ucs->read_urb);
	usb_set_intfdata(interface, NULL);
	ucs->read_urb = ucs->bulk_out_urb = NULL;
	cs->inbuf[0].rcvbuf = ucs->bulk_out_buffer = NULL;
	usb_put_dev(ucs->udev);
	ucs->udev = NULL;
	ucs->interface = NULL;
	gigaset_unassign(cs);
	return retval;
}

static void gigaset_disconnect(struct usb_interface *interface)
{
	struct cardstate *cs;
	struct usb_cardstate *ucs;

	cs = usb_get_intfdata(interface);
	ucs = cs->hw.usb;
	usb_kill_urb(ucs->read_urb);

	gigaset_stop(cs);

	usb_set_intfdata(interface, NULL);
	tasklet_kill(&cs->write_tasklet);

	usb_kill_urb(ucs->bulk_out_urb);	/* FIXME: only if active? */

	kfree(ucs->bulk_out_buffer);
	if (ucs->bulk_out_urb != NULL)
		usb_free_urb(ucs->bulk_out_urb);
	kfree(cs->inbuf[0].rcvbuf);
	if (ucs->read_urb != NULL)
		usb_free_urb(ucs->read_urb);
	ucs->read_urb = ucs->bulk_out_urb = NULL;
	cs->inbuf[0].rcvbuf = ucs->bulk_out_buffer = NULL;

	usb_put_dev(ucs->udev);
	ucs->interface = NULL;
	ucs->udev = NULL;
	cs->dev = NULL;
	gigaset_unassign(cs);
}

static struct gigaset_ops ops = {
	gigaset_write_cmd,
	gigaset_write_room,
	gigaset_chars_in_buffer,
	gigaset_brkchars,
	gigaset_init_bchannel,
	gigaset_close_bchannel,
	gigaset_initbcshw,
	gigaset_freebcshw,
	gigaset_reinitbcshw,
	gigaset_initcshw,
	gigaset_freecshw,
	gigaset_set_modem_ctrl,
	gigaset_baud_rate,
	gigaset_set_line_ctrl,
	gigaset_m10x_send_skb,
	gigaset_m10x_input,
};

/**
 *	usb_gigaset_init
 * This function is called while kernel-module is loaded
 */
static int __init usb_gigaset_init(void)
{
	int result;

	/* allocate memory for our driver state and intialize it */
	if ((driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
				       GIGASET_MODULENAME, GIGASET_DEVNAME,
				       GIGASET_DEVFSNAME, &ops,
				       THIS_MODULE)) == NULL)
		goto error;

	/* allocate memory for our device state and intialize it */
	cardstate = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME);
	if (!cardstate)
		goto error;

	/* register this driver with the USB subsystem */
	result = usb_register(&gigaset_usb_driver);
	if (result < 0) {
		err("usb_gigaset: usb_register failed (error %d)",
		    -result);
		goto error;
	}

	info(DRIVER_AUTHOR);
	info(DRIVER_DESC);
	return 0;

error:	if (cardstate)
		gigaset_freecs(cardstate);
	cardstate = NULL;
	if (driver)
		gigaset_freedriver(driver);
	driver = NULL;
	return -1;
}


/**
 *	usb_gigaset_exit
 * This function is called while unloading the kernel-module
 */
static void __exit usb_gigaset_exit(void)
{
	gigaset_blockdriver(driver); /* => probe will fail
				      * => no gigaset_start any more
				      */

	gigaset_shutdown(cardstate);
	/* from now on, no isdn callback should be possible */

	/* deregister this driver with the USB subsystem */
	usb_deregister(&gigaset_usb_driver);
	/* this will call the disconnect-callback */
	/* from now on, no disconnect/probe callback should be running */

	gigaset_freecs(cardstate);
	cardstate = NULL;
	gigaset_freedriver(driver);
	driver = NULL;
}


module_init(usb_gigaset_init);
module_exit(usb_gigaset_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");