1/*
2 * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
3 * All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 *
20 * File: usbpipe.c
21 *
22 * Purpose: Handle USB control endpoint
23 *
24 * Author: Warren Hsu
25 *
26 * Date: Mar. 29, 2005
27 *
28 * Functions:
29 *	vnt_control_out - Write variable length bytes to MEM/BB/MAC/EEPROM
30 *	vnt_control_in - Read variable length bytes from MEM/BB/MAC/EEPROM
31 *	vnt_control_out_u8 - Write one byte to MEM/BB/MAC/EEPROM
32 *	vnt_control_in_u8 - Read one byte from MEM/BB/MAC/EEPROM
33 *
34 * Revision History:
35 *      04-05-2004 Jerry Chen:  Initial release
36 *      11-24-2004 Warren Hsu: Add ControlvWriteByte,ControlvReadByte,ControlvMaskByte
37 *
38 */
39
40#include "int.h"
41#include "rxtx.h"
42#include "dpc.h"
43#include "desc.h"
44#include "device.h"
45#include "usbpipe.h"
46
47#define USB_CTL_WAIT	500 /* ms */
48
49int vnt_control_out(struct vnt_private *priv, u8 request, u16 value,
50		u16 index, u16 length, u8 *buffer)
51{
52	int status = 0;
53
54	if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags))
55		return STATUS_FAILURE;
56
57	mutex_lock(&priv->usb_lock);
58
59	status = usb_control_msg(priv->usb,
60		usb_sndctrlpipe(priv->usb, 0), request, 0x40, value,
61			index, buffer, length, USB_CTL_WAIT);
62
63	mutex_unlock(&priv->usb_lock);
64
65	if (status < (int)length)
66		return STATUS_FAILURE;
67
68	return STATUS_SUCCESS;
69}
70
71void vnt_control_out_u8(struct vnt_private *priv, u8 reg, u8 reg_off, u8 data)
72{
73	vnt_control_out(priv, MESSAGE_TYPE_WRITE,
74					reg_off, reg, sizeof(u8), &data);
75}
76
77int vnt_control_in(struct vnt_private *priv, u8 request, u16 value,
78		u16 index, u16 length, u8 *buffer)
79{
80	int status;
81
82	if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags))
83		return STATUS_FAILURE;
84
85	mutex_lock(&priv->usb_lock);
86
87	status = usb_control_msg(priv->usb,
88		usb_rcvctrlpipe(priv->usb, 0), request, 0xc0, value,
89			index, buffer, length, USB_CTL_WAIT);
90
91	mutex_unlock(&priv->usb_lock);
92
93	if (status < (int)length)
94		return STATUS_FAILURE;
95
96	return STATUS_SUCCESS;
97}
98
99void vnt_control_in_u8(struct vnt_private *priv, u8 reg, u8 reg_off, u8 *data)
100{
101	vnt_control_in(priv, MESSAGE_TYPE_READ,
102			reg_off, reg, sizeof(u8), data);
103}
104
105static void vnt_start_interrupt_urb_complete(struct urb *urb)
106{
107	struct vnt_private *priv = urb->context;
108	int status;
109
110	switch (urb->status) {
111	case 0:
112	case -ETIMEDOUT:
113		break;
114	case -ECONNRESET:
115	case -ENOENT:
116	case -ESHUTDOWN:
117		priv->int_buf.in_use = false;
118		return;
119	default:
120		break;
121	}
122
123	status = urb->status;
124
125	if (status != STATUS_SUCCESS) {
126		priv->int_buf.in_use = false;
127
128		dev_dbg(&priv->usb->dev, "%s status = %d\n", __func__, status);
129	} else {
130		vnt_int_process_data(priv);
131	}
132
133	status = usb_submit_urb(priv->interrupt_urb, GFP_ATOMIC);
134	if (status)
135		dev_dbg(&priv->usb->dev, "Submit int URB failed %d\n", status);
136	else
137		priv->int_buf.in_use = true;
138}
139
140int vnt_start_interrupt_urb(struct vnt_private *priv)
141{
142	int status = STATUS_FAILURE;
143
144	if (priv->int_buf.in_use == true)
145		return STATUS_FAILURE;
146
147	priv->int_buf.in_use = true;
148
149	usb_fill_int_urb(priv->interrupt_urb,
150			 priv->usb,
151			 usb_rcvintpipe(priv->usb, 1),
152			 priv->int_buf.data_buf,
153			 MAX_INTERRUPT_SIZE,
154			 vnt_start_interrupt_urb_complete,
155			 priv,
156			 priv->int_interval);
157
158	status = usb_submit_urb(priv->interrupt_urb, GFP_ATOMIC);
159	if (status) {
160		dev_dbg(&priv->usb->dev, "Submit int URB failed %d\n", status);
161		priv->int_buf.in_use = false;
162	}
163
164	return status;
165}
166
167static void vnt_submit_rx_urb_complete(struct urb *urb)
168{
169	struct vnt_rcb *rcb = urb->context;
170	struct vnt_private *priv = rcb->priv;
171	unsigned long flags;
172
173	switch (urb->status) {
174	case 0:
175		break;
176	case -ECONNRESET:
177	case -ENOENT:
178	case -ESHUTDOWN:
179		return;
180	case -ETIMEDOUT:
181	default:
182		dev_dbg(&priv->usb->dev, "BULK In failed %d\n", urb->status);
183		break;
184	}
185
186	if (urb->actual_length) {
187		spin_lock_irqsave(&priv->lock, flags);
188
189		if (vnt_rx_data(priv, rcb, urb->actual_length)) {
190			rcb->skb = dev_alloc_skb(priv->rx_buf_sz);
191			if (!rcb->skb) {
192				dev_dbg(&priv->usb->dev,
193					"Failed to re-alloc rx skb\n");
194
195				rcb->in_use = false;
196				spin_unlock_irqrestore(&priv->lock, flags);
197				return;
198			}
199		} else {
200			skb_push(rcb->skb, skb_headroom(rcb->skb));
201			skb_trim(rcb->skb, 0);
202		}
203
204		urb->transfer_buffer = skb_put(rcb->skb,
205						skb_tailroom(rcb->skb));
206
207		spin_unlock_irqrestore(&priv->lock, flags);
208	}
209
210	if (usb_submit_urb(urb, GFP_ATOMIC)) {
211		dev_dbg(&priv->usb->dev, "Failed to re submit rx skb\n");
212
213		rcb->in_use = false;
214	}
215}
216
217int vnt_submit_rx_urb(struct vnt_private *priv, struct vnt_rcb *rcb)
218{
219	int status = 0;
220	struct urb *urb;
221
222	urb = rcb->urb;
223	if (rcb->skb == NULL) {
224		dev_dbg(&priv->usb->dev, "rcb->skb is null\n");
225		return status;
226	}
227
228	usb_fill_bulk_urb(urb,
229			  priv->usb,
230			  usb_rcvbulkpipe(priv->usb, 2),
231			  skb_put(rcb->skb, skb_tailroom(rcb->skb)),
232			  MAX_TOTAL_SIZE_WITH_ALL_HEADERS,
233			  vnt_submit_rx_urb_complete,
234			  rcb);
235
236	status = usb_submit_urb(urb, GFP_ATOMIC);
237	if (status != 0) {
238		dev_dbg(&priv->usb->dev, "Submit Rx URB failed %d\n", status);
239		return STATUS_FAILURE;
240	}
241
242	rcb->in_use = true;
243
244	return status;
245}
246
247static void vnt_tx_context_complete(struct urb *urb)
248{
249	struct vnt_usb_send_context *context = urb->context;
250	struct vnt_private *priv = context->priv;
251
252	switch (urb->status) {
253	case 0:
254		dev_dbg(&priv->usb->dev, "Write %d bytes\n", context->buf_len);
255		break;
256	case -ECONNRESET:
257	case -ENOENT:
258	case -ESHUTDOWN:
259		context->in_use = false;
260		return;
261	case -ETIMEDOUT:
262	default:
263		dev_dbg(&priv->usb->dev, "BULK Out failed %d\n", urb->status);
264		break;
265	}
266
267	if (context->type == CONTEXT_DATA_PACKET)
268		ieee80211_wake_queues(priv->hw);
269
270	if (urb->status || context->type == CONTEXT_BEACON_PACKET) {
271		if (context->skb)
272			ieee80211_free_txskb(priv->hw, context->skb);
273
274		context->in_use = false;
275	}
276}
277
278int vnt_tx_context(struct vnt_private *priv,
279		   struct vnt_usb_send_context *context)
280{
281	int status;
282	struct urb *urb;
283
284	if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags)) {
285		context->in_use = false;
286		return STATUS_RESOURCES;
287	}
288
289	urb = context->urb;
290
291	usb_fill_bulk_urb(urb,
292			  priv->usb,
293			  usb_sndbulkpipe(priv->usb, 3),
294			  context->data,
295			  context->buf_len,
296			  vnt_tx_context_complete,
297			  context);
298
299	status = usb_submit_urb(urb, GFP_ATOMIC);
300	if (status != 0) {
301		dev_dbg(&priv->usb->dev, "Submit Tx URB failed %d\n", status);
302
303		context->in_use = false;
304		return STATUS_FAILURE;
305	}
306
307	return STATUS_PENDING;
308}
309