[PATCH 3.14.0-rc5 v3 8/10] rsi: USB functionality

[PATCH 3.14.0-rc5 v3 8/10] rsi: USB functionality

[Fariya Fatima]

From: Fariya Fatima

This patch has the rsi_usb module, enabling the USB interface for
the 91x chipsets.

Signed-off-by: Fariya Fatima <fariya.f@redpinesignals.com>
---

 rsi_91x_usb.c     |  572 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 rsi_91x_usb_ops.c |  177 ++++++++++++++++
 2 files changed, 749 insertions(+)

diff -rupN linux-3.14-rc5/drivers/net/wireless/rsi/rsi_91x_usb.c linux-3.14-rc5_new/drivers/net/wireless/rsi/rsi_91x_usb.c
--- linux-3.14-rc5/drivers/net/wireless/rsi/rsi_91x_usb.c	1970-01-01 05:30:00.000000000 +0530
+++ linux-3.14-rc5_new/drivers/net/wireless/rsi/rsi_91x_usb.c	2014-03-04 07:37:36.500039770 +0545
@@ -0,0 +1,572 @@
+/**
+ * Copyright (c) 2014 Redpine Signals Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include <linux/module.h>
+#include "rsi_usb.h"
+
+/**
+ * This function writes to the USB Card.
+ *
+ * @param  adapter Pointer to the adapter structure.
+ * @param  buf Pointer to the buffer from where the data has to be taken.
+ * @param  len Length to be written.
+ * @param  endpoint Type of endpoint.
+ * @return status: 0 on success, -1 on failure.
+ */
+static int rsi_usb_card_write(struct rsi_hw *adapter,
+			      void *buf,
+			      u16 len,
+			      u8 endpoint)
+{
+	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
+	int status;
+	s32 transfer;
+
+	status = usb_bulk_msg(dev->usbdev,
+			      usb_sndbulkpipe(dev->usbdev,
+			      dev->bulkout_endpoint_addr[endpoint - 1]),
+			      buf,
+			      len,
+			      &transfer,
+			      HZ * 5);
+
+	if (status < 0) {
+		rsi_dbg(ERR_ZONE,
+			"Card write failed with error code :%10d\n", status);
+		dev->write_fail = 1;
+	}
+	return status;
+}
+
+/**
+ * This function writes multiple bytes of information to the USB card.
+ *
+ * @param  adapter Pointer to the adapter structure.
+ * @param  addr Address of the register.
+ * @param  data Pointer to the data that has to be written.
+ * @param  count Number of multiple bytes to be written.
+ * @return 0 on success, -1 on failure.
+ */
+static int rsi_write_multiple(struct rsi_hw *adapter,
+			      u8 endpoint,
+			      u8 *data,
+			      u32 count)
+{
+	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
+	u8 *seg = dev->tx_buffer;
+
+	if (dev->write_fail)
+		return 0;
+
+	if (endpoint == MGMT_EP) {
+		memset(seg, 0, RSI_USB_TX_HEAD_ROOM);
+		memcpy(seg + RSI_USB_TX_HEAD_ROOM, data, count);
+	} else {
+		seg = ((u8 *)data - RSI_USB_TX_HEAD_ROOM);
+	}
+
+	return rsi_usb_card_write(adapter,
+				  seg,
+				  count + RSI_USB_TX_HEAD_ROOM,
+				  endpoint);
+}
+
+/**
+ * This function initializes the bulk endpoints to the device.
+ *
+ * @param  interface Pointer to the USB interface structure.
+ * @param  adapter Pointer to the adapter structure.
+ * @return ret_val: 0 on success, -ENOMEM on failure.
+ */
+static int rsi_find_bulk_in_and_out_endpoints(struct usb_interface *interface,
+					      struct rsi_hw *adapter)
+{
+	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
+	struct usb_host_interface *iface_desc;
+	struct usb_endpoint_descriptor *endpoint;
+	__le16 buffer_size;
+	int ii, bep_found = 0;
+
+	iface_desc = &(interface->altsetting[0]);
+
+	for (ii = 0; ii < iface_desc->desc.bNumEndpoints; ++ii) {
+		endpoint = &(iface_desc->endpoint[ii].desc);
+
+		if ((!(dev->bulkin_endpoint_addr)) &&
+		    (endpoint->bEndpointAddress & USB_DIR_IN) &&
+		    ((endpoint->bmAttributes &
+		    USB_ENDPOINT_XFERTYPE_MASK) ==
+		    USB_ENDPOINT_XFER_BULK)) {
+			buffer_size = endpoint->wMaxPacketSize;
+			dev->bulkin_size = buffer_size;
+			dev->bulkin_endpoint_addr =
+				endpoint->bEndpointAddress;
+		}
+
+		if (!dev->bulkout_endpoint_addr[bep_found] &&
+		    !(endpoint->bEndpointAddress & USB_DIR_IN) &&
+		    ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
+		      USB_ENDPOINT_XFER_BULK)) {
+			dev->bulkout_endpoint_addr[bep_found] =
+				endpoint->bEndpointAddress;
+			buffer_size = endpoint->wMaxPacketSize;
+			dev->bulkout_size[bep_found] = buffer_size;
+			bep_found++;
+		}
+
+		if (bep_found >= MAX_BULK_EP)
+			break;
+	}
+
+	if (!(dev->bulkin_endpoint_addr) &&
+	    (dev->bulkout_endpoint_addr[0]))
+		return -1;
+
+	return 0;
+}
+
+/* This function reads the data from given register address.
+ *
+ * @param  usbdev Pointer to the usb_device structure.
+ * @param  reg Address of the register to be read.
+ * @param  value Value to be read.
+ * @param  len length of data to be read.
+ * @return status: 0 on success, -1 on failure.
+ */
+static int rsi_usb_reg_read(struct usb_device *usbdev,
+			    u32 reg,
+			    u16 *value,
+			    u16 len)
+{
+	u8 temp_buf[4];
+	int status = 0;
+
+	status = usb_control_msg(usbdev,
+				 usb_rcvctrlpipe(usbdev, 0),
+				 USB_VENDOR_REGISTER_READ,
+				 USB_TYPE_VENDOR,
+				 ((reg & 0xffff0000) >> 16), (reg & 0xffff),
+				 (void *)temp_buf,
+				 len,
+				 HZ * 5);
+
+	*value = (temp_buf[0] | (temp_buf[1] << 8));
+	if (status < 0) {
+		rsi_dbg(ERR_ZONE,
+			"%s: Reg read failed with error code :%d\n",
+			__func__, status);
+	}
+	return status;
+}
+
+/**
+ * This function writes the given data into the given register address.
+ *
+ * @param  usbdev Pointer to the usb_device structure.
+ * @param  reg Address of the register.
+ * @param  value Value to write.
+ * @param  len Length of data to be written.
+ * @return status: 0 on success, -1 on failure.
+ */
+static int rsi_usb_reg_write(struct usb_device *usbdev,
+			     u32 reg,
+			     u16 value,
+			     u16 len)
+{
+	u8 usb_reg_buf[4];
+	int status = 0;
+
+	usb_reg_buf[0] = (value & 0x00ff);
+	usb_reg_buf[1] = (value & 0xff00) >> 8;
+	usb_reg_buf[2] = 0x0;
+	usb_reg_buf[3] = 0x0;
+
+	status = usb_control_msg(usbdev,
+				 usb_sndctrlpipe(usbdev, 0),
+				 USB_VENDOR_REGISTER_WRITE,
+				 USB_TYPE_VENDOR,
+				 ((reg & 0xffff0000) >> 16),
+				 (reg & 0xffff),
+				 (void *)usb_reg_buf,
+				 len,
+				 HZ * 5);
+	if (status < 0) {
+		rsi_dbg(ERR_ZONE,
+			"%s: Reg write failed with error code :%d\n",
+			__func__, status);
+	}
+	return status;
+}
+
+/**
+ * This function is called when a packet is received from USB
+ * the stack. This is a callback to recieve done.
+ *
+ * @param  urb Received URB.
+ * @return None.
+ */
+static void rsi_rx_done_handler(struct urb *urb)
+{
+	struct rsi_hw *adapter = urb->context;
+	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
+
+	if (urb->status)
+		return;
+
+	rsi_set_event(&dev->rx_thread.event);
+	return;
+}
+
+/**
+ * This function submits the given URB to the USB stack.
+ *
+ * @param  adapter Pointer to the adapter structure.
+ * @return 0 on success, -1 on failure.
+ */
+int rsi_rx_urb_submit(struct rsi_hw *adapter)
+{
+	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
+	struct urb *urb = dev->rx_usb_urb[0];
+
+	usb_fill_bulk_urb(urb,
+			  dev->usbdev,
+			  usb_rcvbulkpipe(dev->usbdev,
+				dev->bulkin_endpoint_addr),
+			  urb->transfer_buffer,
+			  3000,
+			  rsi_rx_done_handler,
+			  adapter);
+	if (usb_submit_urb(urb, GFP_KERNEL)) {
+		rsi_dbg(ERR_ZONE, "%s: Failed in urb submission\n", __func__);
+		return -1;
+	}
+
+	return 0;
+}
+
+/**
+ * This function writes multiple bytes of information to multiple registers.
+ *
+ * @param  adapter Pointer to the adapter structure.
+ * @param  addr Address of the register.
+ * @param  data Pointer to the data that has to be written.
+ * @param  count Number of multiple bytes to be written on to the registers.
+ * @return status: 0 on success, -1 on failure.
+ */
+int rsi_write_ta_register_multiple(struct rsi_hw *adapter,
+				   u32 addr,
+				   u8 *data,
+				   u32 count)
+{
+	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
+	u8 *buf;
+	u8 transfer;
+	int status = 0;
+
+	buf = kzalloc(4096, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	while (count) {
+		transfer = min_t(int, count, 4096);
+		memcpy(buf, data, transfer);
+		status = usb_control_msg(dev->usbdev,
+					 usb_sndctrlpipe(dev->usbdev, 0),
+					 USB_VENDOR_REGISTER_WRITE,
+					 USB_TYPE_VENDOR,
+					 ((addr & 0xffff0000) >> 16),
+					 (addr & 0xffff),
+					 (void *)buf,
+					 transfer,
+					 HZ * 5);
+		if (status < 0) {
+			rsi_dbg(ERR_ZONE,
+				"Reg write failed with error code :%d\n",
+				status);
+		} else {
+			count -= transfer;
+			data += transfer;
+			addr += transfer;
+		}
+	}
+
+	kfree(buf);
+	return 0;
+}
+
+/**
+ * This function writes the packet to the USB card.
+ *
+ * @param  adapter Pointer to the adapter structure.
+ * @param  pkt Pointer to the data to be written on to the card.
+ * @param  len Length of the data to be written on to the card.
+ * @return 0 on success, -1 on failure.
+ */
+int rsi_host_intf_write_pkt(struct rsi_hw *adapter,
+			    u8 *pkt,
+			    u32 len)
+{
+	u32 queueno = ((pkt[1] >> 4) & 0xf);
+	u8 endpoint;
+
+	endpoint = ((queueno == RSI_WIFI_MGMT_Q) ? MGMT_EP : DATA_EP);
+
+	return rsi_write_multiple(adapter,
+				  endpoint,
+				  (u8 *)pkt,
+				  len);
+}
+
+/**
+ * This function deinitializes the usb interface.
+ *
+ * @param  common Pointer to the common structure
+ * @return VOID.
+ */
+static void rsi_deinit_usb_interface(struct rsi_hw *adapter)
+{
+	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
+
+	rsi_kill_thread(&dev->rx_thread);
+	kfree(adapter->priv->rx_data_pkt);
+	return;
+}
+
+/**
+ * This function initializes the usb interface.
+ *
+ * @param  adapter Pointer to the adapter structure.
+ * @param  pfunction Pointer to USB interface structure.
+ * @return 0 on success, -1 on failure.
+ */
+static int rsi_init_usb_interface(struct rsi_hw *adapter,
+				  struct usb_interface *pfunction)
+{
+	struct rsi_91x_usbdev *rsi_dev;
+	struct rsi_common *common = adapter->priv;
+
+	rsi_dev = kzalloc(sizeof(*rsi_dev), GFP_KERNEL);
+	if (!rsi_dev)
+		return -1;
+
+	adapter->rsi_dev = rsi_dev;
+	rsi_dev->usbdev = interface_to_usbdev(pfunction);
+
+	if (rsi_find_bulk_in_and_out_endpoints(pfunction, adapter))
+		return -1;
+
+	adapter->device = &pfunction->dev;
+	usb_set_intfdata(pfunction, adapter);
+
+	common->rx_data_pkt = kmalloc(2048, GFP_KERNEL);
+	if (!common->rx_data_pkt) {
+		rsi_dbg(ERR_ZONE, "%s: Failed to allocate memory\n",
+			__func__);
+		return -1;
+	}
+
+	rsi_dev->tx_buffer = kmalloc(2048, GFP_ATOMIC);
+	rsi_dev->rx_usb_urb[0] = usb_alloc_urb(0, GFP_KERNEL);
+	rsi_dev->rx_usb_urb[0]->transfer_buffer = adapter->priv->rx_data_pkt;
+	rsi_dev->tx_blk_size = 252;
+
+	/* Initializing function callbacks */
+	adapter->rx_urb_submit = rsi_rx_urb_submit;
+	adapter->host_intf_write_pkt = rsi_host_intf_write_pkt;
+	adapter->check_hw_queue_status = rsi_check_queue_status;
+	adapter->determine_event_timeout = rsi_event_timeout;
+
+	rsi_init_event(&rsi_dev->rx_thread.event);
+	if (rsi_create_kthread(common,
+			       &rsi_dev->rx_thread,
+			       rsi_usb_rx_thread,
+			       "RX-Thread")) {
+		rsi_dbg(ERR_ZONE, "%s: Unable to init rx thrd\n",
+			__func__);
+		goto fail;
+	}
+
+#ifdef CONFIG_RSI_DEBUGFS
+	/* In USB, one less than the MAX_DEBUGFS_ENTRIES entries is required */
+	adapter->num_debugfs_entries = (MAX_DEBUGFS_ENTRIES - 1);
+#endif
+
+	rsi_dbg(INIT_ZONE, "%s: Enabled the interface\n", __func__);
+	return 0;
+
+fail:
+	kfree(common->rx_data_pkt);
+	return -1;
+}
+
+/**
+ * This function is called by kernel when the driver provided
+ * Vendor and device IDs are matched. All the initialization
+ * work is done here.
+ *
+ * @param  pfunction Pointer to the USB interface structure.
+ * @param  id Pointer to the usb_device_id structure.
+ * @return 0 on success, -1 on failure.
+ */
+static int rsi_probe(struct usb_interface *pfunction,
+		     const struct usb_device_id *id)
+{
+	struct rsi_hw *adapter;
+	struct rsi_91x_usbdev *dev;
+	u16 fw_status;
+
+	rsi_dbg(INIT_ZONE, "%s: Init function called\n", __func__);
+
+	adapter = rsi_init_os_intf_ops();
+	if (!adapter) {
+		rsi_dbg(ERR_ZONE, "%s: Failed to init os intf ops\n",
+			__func__);
+		return 1;
+	}
+
+	if (rsi_init_usb_interface(adapter, pfunction)) {
+		rsi_dbg(ERR_ZONE, "%s: Failed to init usb interface\n",
+			__func__);
+		goto err;
+	}
+
+	rsi_dbg(ERR_ZONE, "%s: Initialized os intf ops\n", __func__);
+
+	dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
+
+	if (rsi_usb_reg_read(dev->usbdev, FW_STATUS_REG, &fw_status, 2) < 0)
+		goto err1;
+	else
+		fw_status &= 1;
+
+	if (!fw_status) {
+		if (rsi_device_init(adapter->priv)) {
+			rsi_dbg(ERR_ZONE, "%s: Failed in device init\n",
+				__func__);
+			goto err1;
+		}
+
+		if (rsi_usb_reg_write(dev->usbdev,
+				      USB_INTERNAL_REG_1,
+				      RSI_USB_READY_MAGIC_NUM, 1) < 0)
+			goto err1;
+		rsi_dbg(INIT_ZONE, "%s: Performed device init\n", __func__);
+	}
+
+	if (rsi_rx_urb_submit(adapter))
+		goto err1;
+
+	return 0;
+err1:
+	rsi_deinit_usb_interface(adapter);
+err:
+	rsi_deinit_os_intf_ops(adapter);
+	rsi_dbg(ERR_ZONE, "%s: Failed in probe...Exiting\n", __func__);
+	return 1;
+}
+
+/**
+ * This function performs the reverse of the probe function,
+ * it deintialize the driver structure.
+ *
+ * @param  pfunction Pointer to the USB interface structure.
+ * @return None.
+ */
+static void rsi_disconnect(struct usb_interface *pfunction)
+{
+	struct rsi_hw *adapter = usb_get_intfdata(pfunction);
+
+	if (!adapter)
+		return;
+
+	rsi_mac80211_detach(adapter);
+	rsi_deinit_usb_interface(adapter);
+	rsi_deinit_os_intf_ops(adapter);
+
+	rsi_dbg(INFO_ZONE, "%s: Deinitialization completed\n", __func__);
+	return;
+}
+
+#ifdef CONFIG_PM
+static int rsi_suspend(struct usb_interface *intf, pm_message_t message)
+{
+	/* Not yet implemented */
+	return -ENOSYS;
+}
+
+static int rsi_resume(struct usb_interface *intf)
+{
+	/* Not yet implemented */
+	return -ENOSYS;
+}
+#endif
+
+static const struct usb_device_id rsi_dev_table[] = {
+	{ USB_DEVICE(0x0303, 0x0100) },
+	{ USB_DEVICE(0x041B, 0x0301) },
+	{ USB_DEVICE(0x041B, 0x0201) },
+	{ USB_DEVICE(0x041B, 0x9330) },
+	{ /* Blank */},
+};
+
+static struct usb_driver rsi_driver = {
+	.name       = "RSI-USB WLAN",
+	.probe      = rsi_probe,
+	.disconnect = rsi_disconnect,
+	.id_table   = rsi_dev_table,
+#ifdef CONFIG_PM
+	.suspend    = rsi_suspend,
+	.resume     = rsi_resume,
+#endif
+};
+
+/**
+ * This function registers the client driver.
+ *
+ * @param  Void.
+ * @return 0 on success.
+ */
+static int rsi_module_init(void)
+{
+	usb_register(&rsi_driver);
+	rsi_dbg(INIT_ZONE, "%s: Registering driver\n", __func__);
+	return 0;
+}
+
+/**
+ * This function unregisters the client driver.
+ *
+ * @param  Void.
+ * @return None.
+ */
+static void rsi_module_exit(void)
+{
+	usb_deregister(&rsi_driver);
+	rsi_dbg(INFO_ZONE, "%s: Unregistering driver\n", __func__);
+	return;
+}
+
+module_init(rsi_module_init);
+module_exit(rsi_module_exit);
+
+MODULE_AUTHOR("Redpine Signals Inc");
+MODULE_DESCRIPTION("Common USB layer for RSI drivers");
+MODULE_SUPPORTED_DEVICE("RSI-91x");
+MODULE_DEVICE_TABLE(usb, rsi_dev_table);
+MODULE_FIRMWARE(FIRMWARE_RSI9113);
+MODULE_VERSION("0.1");
+MODULE_LICENSE("GPL");
diff -rupN linux-3.14-rc5/drivers/net/wireless/rsi/rsi_91x_usb_ops.c linux-3.14-rc5_new/drivers/net/wireless/rsi/rsi_91x_usb_ops.c
--- linux-3.14-rc5/drivers/net/wireless/rsi/rsi_91x_usb_ops.c	1970-01-01 05:30:00.000000000 +0530
+++ linux-3.14-rc5_new/drivers/net/wireless/rsi/rsi_91x_usb_ops.c	2014-03-04 07:37:39.283004978 +0545
@@ -0,0 +1,177 @@
+/**
+ * Copyright (c) 2014 Redpine Signals Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include <linux/firmware.h>
+#include "rsi_usb.h"
+
+/**
+ * This function includes the actual funtionality of copying the TA firmware to the card.
+ * Basically this function includes opening the TA file,reading the TA file and
+ * writing their values in blocks of data.
+ *
+ * @param  common Pointer to the driver private structure.
+ * @param  fw Pointer to the firmware value to be written.
+ * @param  len length of firmware file.
+ * @param  num_blocks Number of blocks to be written to the card.
+ * @return 0 on success and -1 on failure.
+ */
+static int rsi_copy_to_card(struct rsi_common *common,
+			    const u8 *fw,
+			    u32 len,
+			    u32 num_blocks)
+{
+	struct rsi_hw *adapter = common->priv;
+	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
+	u32 indx, ii;
+	u32 block_size = dev->tx_blk_size;
+	u32 lsb_address;
+	u32 base_address;
+
+	base_address = TA_LOAD_ADDRESS;
+
+	for (indx = 0, ii = 0; ii < num_blocks; ii++, indx += block_size) {
+		lsb_address = base_address;
+		if (rsi_write_ta_register_multiple(adapter,
+						   lsb_address,
+						   (u8 *)(fw + indx),
+						   block_size)) {
+			rsi_dbg(ERR_ZONE,
+				"%s: Unable to load %s blk\n", __func__,
+				FIRMWARE_RSI9113);
+			return -1;
+		}
+		rsi_dbg(INIT_ZONE, "%s: loading block: %d\n", __func__, ii);
+		base_address += block_size;
+	}
+
+	if (len % block_size) {
+		lsb_address = base_address;
+		if (rsi_write_ta_register_multiple(adapter,
+						   lsb_address,
+						   (u8 *)(fw + indx),
+						   len % block_size)) {
+			rsi_dbg(ERR_ZONE,
+				"%s: Unable to load %s blk\n", __func__,
+				FIRMWARE_RSI9113);
+			return -1;
+		}
+	}
+	rsi_dbg(INIT_ZONE,
+		"%s: Succesfully loaded %s instructions\n", __func__,
+		FIRMWARE_RSI9113);
+
+	rsi_dbg(INIT_ZONE, "%s: loaded firmware\n", __func__);
+	return 0;
+}
+
+/**
+ * This is a kernel thread to receive the packets from the USB device.
+ *
+ * @param  common Pointer to the driver private structure.
+ * @return None.
+ */
+void rsi_usb_rx_thread(struct rsi_common *common)
+{
+	struct rsi_hw *adapter = common->priv;
+	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
+	int status;
+
+	do {
+		rsi_wait_event(&dev->rx_thread.event, EVENT_WAIT_FOREVER);
+
+		if (atomic_read(&dev->rx_thread.thread_done))
+			goto out;
+
+		mutex_lock(&common->tx_rxlock);
+		status = rsi_read_pkt(common, 0);
+		if (status) {
+			rsi_dbg(ERR_ZONE, "%s: Failed To read data", __func__);
+			mutex_unlock(&common->tx_rxlock);
+			return;
+		}
+		mutex_unlock(&common->tx_rxlock);
+		rsi_reset_event(&dev->rx_thread.event);
+		if (adapter->rx_urb_submit(adapter)) {
+			rsi_dbg(ERR_ZONE,
+				"%s: Failed in urb submission", __func__);
+			return;
+		}
+	} while (1);
+
+out:
+	rsi_dbg(INFO_ZONE, "%s: Terminated thread\n", __func__);
+	complete_and_exit(&dev->rx_thread.completion, 0);
+	return;
+}
+
+
+/**
+ * This function includes the actual funtionality of loading the TA firmware.
+ * This function also includes opening the TA file,reading the TA file and
+ * writing their values in blocks of data.
+ *
+ * @param  common Pointer to the driver private structure.
+ * @param  fw_status Firmware status.
+ * @return status: 0 on success, -1 on failure.
+ */
+static int rsi_load_ta_instructions(struct rsi_common *common)
+{
+	struct rsi_hw *adapter = common->priv;
+	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
+	const struct firmware *fw_entry = NULL;
+	u32 block_size = dev->tx_blk_size;
+	const u8 *fw;
+	u32 num_blocks, len;
+	int status = 0;
+
+	status = request_firmware(&fw_entry, FIRMWARE_RSI9113, adapter->device);
+	if (status < 0) {
+		rsi_dbg(ERR_ZONE, "%s Firmware file %s not found\n",
+			__func__, FIRMWARE_RSI9113);
+		return status;
+	}
+
+	fw = kmemdup(fw_entry->data, fw_entry->size, GFP_KERNEL);
+	len = fw_entry->size;
+
+	if (len % 4)
+		len += (4 - (len % 4));
+
+	num_blocks = (len / block_size);
+
+	rsi_dbg(INIT_ZONE, "%s: Instruction size:%d\n", __func__, len);
+	rsi_dbg(INIT_ZONE, "%s: num blocks: %d\n", __func__, num_blocks);
+
+	status = rsi_copy_to_card(common, fw, len, num_blocks);
+	release_firmware(fw_entry);
+	return status;
+}
+
+/**
+ * This Function Initializes The HAL.
+ *
+ * @param  common Pointer to the driver private structure.
+ * @param  fw_status Firmware status.
+ * @return 0 on success, -1 on failure.
+ */
+int rsi_device_init(struct rsi_common *common)
+{
+	if (rsi_load_ta_instructions(common))
+		return -1;
+
+	return 0;
+}