zd_usb.c

linux内核源码

	cmd[3] = 0x43;	/* bulk command signature */
	cmd[14] = 6;	/* command length */

	cmd[15] = 0x1b;	/* SCSI command: START STOP UNIT */
	cmd[19] = 0x2;	/* eject disc */

	dev_info(&udev->dev, "Ejecting virtual installer media...\n");
	r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
		cmd, 31, NULL, 2000);
	kfree(cmd);
	if (r)
		return r;

	/* At this point, the device disconnects and reconnects with the real
	 * ID numbers. */

	usb_set_intfdata(intf, NULL);
	return 0;
}

int zd_usb_init_hw(struct zd_usb *usb)
{
	int r;
	struct zd_mac *mac = zd_usb_to_mac(usb);

	dev_dbg_f(zd_usb_dev(usb), "\n");

	r = upload_firmware(usb);
	if (r) {
		dev_err(zd_usb_dev(usb),
		       "couldn't load firmware. Error number %d\n", r);
		return r;
	}

	r = usb_reset_configuration(zd_usb_to_usbdev(usb));
	if (r) {
		dev_dbg_f(zd_usb_dev(usb),
			"couldn't reset configuration. Error number %d\n", r);
		return r;
	}

	r = zd_mac_init_hw(mac);
	if (r) {
		dev_dbg_f(zd_usb_dev(usb),
		         "couldn't initialize mac. Error number %d\n", r);
		return r;
	}

	usb->initialized = 1;
	return 0;
}

static int probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	int r;
	struct zd_usb *usb;
	struct usb_device *udev = interface_to_usbdev(intf);
	struct net_device *netdev = NULL;

	print_id(udev);

	if (id->driver_info & DEVICE_INSTALLER)
		return eject_installer(intf);

	switch (udev->speed) {
	case USB_SPEED_LOW:
	case USB_SPEED_FULL:
	case USB_SPEED_HIGH:
		break;
	default:
		dev_dbg_f(&intf->dev, "Unknown USB speed\n");
		r = -ENODEV;
		goto error;
	}

	usb_reset_device(interface_to_usbdev(intf));

	netdev = zd_netdev_alloc(intf);
	if (netdev == NULL) {
		r = -ENOMEM;
		goto error;
	}

	usb = &zd_netdev_mac(netdev)->chip.usb;
	usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;

	r = zd_mac_preinit_hw(zd_netdev_mac(netdev));
	if (r) {
		dev_dbg_f(&intf->dev,
		         "couldn't initialize mac. Error number %d\n", r);
		goto error;
	}

	r = register_netdev(netdev);
	if (r) {
		dev_dbg_f(&intf->dev,
			 "couldn't register netdev. Error number %d\n", r);
		goto error;
	}

	dev_dbg_f(&intf->dev, "successful\n");
	dev_info(&intf->dev,"%s\n", netdev->name);
	return 0;
error:
	usb_reset_device(interface_to_usbdev(intf));
	zd_netdev_free(netdev);
	return r;
}

static void disconnect(struct usb_interface *intf)
{
	struct net_device *netdev = zd_intf_to_netdev(intf);
	struct zd_mac *mac;
	struct zd_usb *usb;

	/* Either something really bad happened, or we're just dealing with
	 * a DEVICE_INSTALLER. */
	if (netdev == NULL)
		return;

	mac = zd_netdev_mac(netdev);
	usb = &mac->chip.usb;

	dev_dbg_f(zd_usb_dev(usb), "\n");

	zd_netdev_disconnect(netdev);

	/* Just in case something has gone wrong! */
	zd_usb_disable_rx(usb);
	zd_usb_disable_int(usb);

	/* If the disconnect has been caused by a removal of the
	 * driver module, the reset allows reloading of the driver. If the
	 * reset will not be executed here, the upload of the firmware in the
	 * probe function caused by the reloading of the driver will fail.
	 */
	usb_reset_device(interface_to_usbdev(intf));

	zd_netdev_free(netdev);
	dev_dbg(&intf->dev, "disconnected\n");
}

static struct usb_driver driver = {
	.name		= "zd1211rw",
	.id_table	= usb_ids,
	.probe		= probe,
	.disconnect	= disconnect,
};

struct workqueue_struct *zd_workqueue;

static int __init usb_init(void)
{
	int r;

	pr_debug("%s usb_init()\n", driver.name);

	zd_workqueue = create_singlethread_workqueue(driver.name);
	if (zd_workqueue == NULL) {
		printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
		return -ENOMEM;
	}

	r = usb_register(&driver);
	if (r) {
		destroy_workqueue(zd_workqueue);
		printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
		       driver.name, r);
		return r;
	}

	pr_debug("%s initialized\n", driver.name);
	return 0;
}

static void __exit usb_exit(void)
{
	pr_debug("%s usb_exit()\n", driver.name);
	usb_deregister(&driver);
	destroy_workqueue(zd_workqueue);
}

module_init(usb_init);
module_exit(usb_exit);

static int usb_int_regs_length(unsigned int count)
{
	return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
}

static void prepare_read_regs_int(struct zd_usb *usb)
{
	struct zd_usb_interrupt *intr = &usb->intr;

	spin_lock_irq(&intr->lock);
	intr->read_regs_enabled = 1;
	INIT_COMPLETION(intr->read_regs.completion);
	spin_unlock_irq(&intr->lock);
}

static void disable_read_regs_int(struct zd_usb *usb)
{
	struct zd_usb_interrupt *intr = &usb->intr;

	spin_lock_irq(&intr->lock);
	intr->read_regs_enabled = 0;
	spin_unlock_irq(&intr->lock);
}

static int get_results(struct zd_usb *usb, u16 *values,
	               struct usb_req_read_regs *req, unsigned int count)
{
	int r;
	int i;
	struct zd_usb_interrupt *intr = &usb->intr;
	struct read_regs_int *rr = &intr->read_regs;
	struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;

	spin_lock_irq(&intr->lock);

	r = -EIO;
	/* The created block size seems to be larger than expected.
	 * However results appear to be correct.
	 */
	if (rr->length < usb_int_regs_length(count)) {
		dev_dbg_f(zd_usb_dev(usb),
			 "error: actual length %d less than expected %d\n",
			 rr->length, usb_int_regs_length(count));
		goto error_unlock;
	}
	if (rr->length > sizeof(rr->buffer)) {
		dev_dbg_f(zd_usb_dev(usb),
			 "error: actual length %d exceeds buffer size %zu\n",
			 rr->length, sizeof(rr->buffer));
		goto error_unlock;
	}

	for (i = 0; i < count; i++) {
		struct reg_data *rd = &regs->regs[i];
		if (rd->addr != req->addr[i]) {
			dev_dbg_f(zd_usb_dev(usb),
				 "rd[%d] addr %#06hx expected %#06hx\n", i,
				 le16_to_cpu(rd->addr),
				 le16_to_cpu(req->addr[i]));
			goto error_unlock;
		}
		values[i] = le16_to_cpu(rd->value);
	}

	r = 0;
error_unlock:
	spin_unlock_irq(&intr->lock);
	return r;
}

int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
	             const zd_addr_t *addresses, unsigned int count)
{
	int r;
	int i, req_len, actual_req_len;
	struct usb_device *udev;
	struct usb_req_read_regs *req = NULL;
	unsigned long timeout;

	if (count < 1) {
		dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
		return -EINVAL;
	}
	if (count > USB_MAX_IOREAD16_COUNT) {
		dev_dbg_f(zd_usb_dev(usb),
			 "error: count %u exceeds possible max %u\n",
			 count, USB_MAX_IOREAD16_COUNT);
		return -EINVAL;
	}
	if (in_atomic()) {
		dev_dbg_f(zd_usb_dev(usb),
			 "error: io in atomic context not supported\n");
		return -EWOULDBLOCK;
	}
	if (!usb_int_enabled(usb)) {
		 dev_dbg_f(zd_usb_dev(usb),
			  "error: usb interrupt not enabled\n");
		return -EWOULDBLOCK;
	}

	req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
	req = kmalloc(req_len, GFP_KERNEL);
	if (!req)
		return -ENOMEM;
	req->id = cpu_to_le16(USB_REQ_READ_REGS);
	for (i = 0; i < count; i++)
		req->addr[i] = cpu_to_le16((u16)addresses[i]);

	udev = zd_usb_to_usbdev(usb);
	prepare_read_regs_int(usb);
	r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
		         req, req_len, &actual_req_len, 1000 /* ms */);
	if (r) {
		dev_dbg_f(zd_usb_dev(usb),
			"error in usb_bulk_msg(). Error number %d\n", r);
		goto error;
	}
	if (req_len != actual_req_len) {
		dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
			" req_len %d != actual_req_len %d\n",
			req_len, actual_req_len);
		r = -EIO;
		goto error;
	}

	timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
	                                      msecs_to_jiffies(1000));
	if (!timeout) {
		disable_read_regs_int(usb);
		dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
		r = -ETIMEDOUT;
		goto error;
	}

	r = get_results(usb, values, req, count);
error:
	kfree(req);
	return r;
}

int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
	              unsigned int count)
{
	int r;
	struct usb_device *udev;
	struct usb_req_write_regs *req = NULL;
	int i, req_len, actual_req_len;

	if (count == 0)
		return 0;
	if (count > USB_MAX_IOWRITE16_COUNT) {
		dev_dbg_f(zd_usb_dev(usb),
			"error: count %u exceeds possible max %u\n",
			count, USB_MAX_IOWRITE16_COUNT);
		return -EINVAL;
	}
	if (in_atomic()) {
		dev_dbg_f(zd_usb_dev(usb),
			"error: io in atomic context not supported\n");
		return -EWOULDBLOCK;
	}

	req_len = sizeof(struct usb_req_write_regs) +
		  count * sizeof(struct reg_data);
	req = kmalloc(req_len, GFP_KERNEL);
	if (!req)
		return -ENOMEM;

	req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
	for (i = 0; i < count; i++) {
		struct reg_data *rw  = &req->reg_writes[i];
		rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
		rw->value = cpu_to_le16(ioreqs[i].value);
	}

	udev = zd_usb_to_usbdev(usb);
	r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
		         req, req_len, &actual_req_len, 1000 /* ms */);
	if (r) {
		dev_dbg_f(zd_usb_dev(usb),
			"error in usb_bulk_msg(). Error number %d\n", r);
		goto error;
	}
	if (req_len != actual_req_len) {
		dev_dbg_f(zd_usb_dev(usb),
			"error in usb_bulk_msg()"
			" req_len %d != actual_req_len %d\n",
			req_len, actual_req_len);
		r = -EIO;
		goto error;
	}

	/* FALL-THROUGH with r == 0 */
error:
	kfree(req);
	return r;
}

int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
{
	int r;
	struct usb_device *udev;
	struct usb_req_rfwrite *req = NULL;
	int i, req_len, actual_req_len;
	u16 bit_value_template;

	if (in_atomic()) {
		dev_dbg_f(zd_usb_dev(usb),
			"error: io in atomic context not supported\n");
		return -EWOULDBLOCK;
	}
	if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
		dev_dbg_f(zd_usb_dev(usb),
			"error: bits %d are smaller than"
			" USB_MIN_RFWRITE_BIT_COUNT %d\n",
			bits, USB_MIN_RFWRITE_BIT_COUNT);
		return -EINVAL;
	}
	if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
		dev_dbg_f(zd_usb_dev(usb),
			"error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
			bits, USB_MAX_RFWRITE_BIT_COUNT);
		return -EINVAL;
	}
#ifdef DEBUG
	if (value & (~0UL << bits)) {
		dev_dbg_f(zd_usb_dev(usb),
			"error: value %#09x has bits >= %d set\n",
			value, bits);
		return -EINVAL;
	}
#endif /* DEBUG */

	dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);

	r = zd_usb_ioread16(usb, &bit_value_template, CR203);
	if (r) {
		dev_dbg_f(zd_usb_dev(usb),
			"error %d: Couldn't read CR203\n", r);
		goto out;
	}
	bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);

	req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
	req = kmalloc(req_len, GFP_KERNEL);
	if (!req)
		return -ENOMEM;

	req->id = cpu_to_le16(USB_REQ_WRITE_RF);
	/* 1: 3683a, but not used in ZYDAS driver */
	req->value = cpu_to_le16(2);
	req->bits = cpu_to_le16(bits);

	for (i = 0; i < bits; i++) {
		u16 bv = bit_value_template;
		if (value & (1 << (bits-1-i)))
			bv |= RF_DATA;
		req->bit_values[i] = cpu_to_le16(bv);
	}

	udev = zd_usb_to_usbdev(usb);
	r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
		         req, req_len, &actual_req_len, 1000 /* ms */);
	if (r) {
		dev_dbg_f(zd_usb_dev(usb),
			"error in usb_bulk_msg(). Error number %d\n", r);
		goto out;
	}
	if (req_len != actual_req_len) {
		dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
			" req_len %d != actual_req_len %d\n",
			req_len, actual_req_len);
		r = -EIO;
		goto out;
	}

	/* FALL-THROUGH with r == 0 */
out:
	kfree(req);
	return r;
}