1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
4 * All rights reserved.
5 *
6 * File: usbpipe.c
7 *
8 * Purpose: Handle USB control endpoint
9 *
10 * Author: Warren Hsu
11 *
12 * Date: Mar. 29, 2005
13 *
14 * Functions:
15 * vnt_control_out - Write variable length bytes to MEM/BB/MAC/EEPROM
16 * vnt_control_in - Read variable length bytes from MEM/BB/MAC/EEPROM
17 * vnt_control_out_u8 - Write one byte to MEM/BB/MAC/EEPROM
18 * vnt_control_in_u8 - Read one byte from MEM/BB/MAC/EEPROM
19 *
20 * Revision History:
21 * 04-05-2004 Jerry Chen: Initial release
22 * 11-24-2004 Warren Hsu: Add ControlvWriteByte,ControlvReadByte,
23 * ControlvMaskByte
24 *
25 */
26
27 #include "int.h"
28 #include "rxtx.h"
29 #include "dpc.h"
30 #include "desc.h"
31 #include "device.h"
32 #include "usbpipe.h"
33
34 #define USB_CTL_WAIT 500 /* ms */
35
vnt_control_out(struct vnt_private * priv,u8 request,u16 value,u16 index,u16 length,u8 * buffer)36 int vnt_control_out(struct vnt_private *priv, u8 request, u16 value,
37 u16 index, u16 length, u8 *buffer)
38 {
39 int ret = 0;
40 u8 *usb_buffer;
41
42 if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags)) {
43 ret = -EINVAL;
44 goto end;
45 }
46
47 mutex_lock(&priv->usb_lock);
48
49 usb_buffer = kmemdup(buffer, length, GFP_KERNEL);
50 if (!usb_buffer) {
51 ret = -ENOMEM;
52 goto end_unlock;
53 }
54
55 ret = usb_control_msg(priv->usb,
56 usb_sndctrlpipe(priv->usb, 0),
57 request, 0x40, value,
58 index, usb_buffer, length, USB_CTL_WAIT);
59
60 kfree(usb_buffer);
61
62 if (ret >= 0 && ret < (int)length)
63 ret = -EIO;
64
65 end_unlock:
66 mutex_unlock(&priv->usb_lock);
67 end:
68 return ret;
69 }
70
vnt_control_out_u8(struct vnt_private * priv,u8 reg,u8 reg_off,u8 data)71 int vnt_control_out_u8(struct vnt_private *priv, u8 reg, u8 reg_off, u8 data)
72 {
73 return vnt_control_out(priv, MESSAGE_TYPE_WRITE,
74 reg_off, reg, sizeof(u8), &data);
75 }
76
vnt_control_in(struct vnt_private * priv,u8 request,u16 value,u16 index,u16 length,u8 * buffer)77 int vnt_control_in(struct vnt_private *priv, u8 request, u16 value,
78 u16 index, u16 length, u8 *buffer)
79 {
80 int ret = 0;
81 u8 *usb_buffer;
82
83 if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags)) {
84 ret = -EINVAL;
85 goto end;
86 }
87
88 mutex_lock(&priv->usb_lock);
89
90 usb_buffer = kmalloc(length, GFP_KERNEL);
91 if (!usb_buffer) {
92 ret = -ENOMEM;
93 goto end_unlock;
94 }
95
96 ret = usb_control_msg(priv->usb,
97 usb_rcvctrlpipe(priv->usb, 0),
98 request, 0xc0, value,
99 index, usb_buffer, length, USB_CTL_WAIT);
100
101 if (ret == length)
102 memcpy(buffer, usb_buffer, length);
103
104 kfree(usb_buffer);
105
106 if (ret >= 0 && ret < (int)length)
107 ret = -EIO;
108
109 end_unlock:
110 mutex_unlock(&priv->usb_lock);
111 end:
112 return ret;
113 }
114
vnt_control_in_u8(struct vnt_private * priv,u8 reg,u8 reg_off,u8 * data)115 int vnt_control_in_u8(struct vnt_private *priv, u8 reg, u8 reg_off, u8 *data)
116 {
117 return vnt_control_in(priv, MESSAGE_TYPE_READ,
118 reg_off, reg, sizeof(u8), data);
119 }
120
vnt_start_interrupt_urb_complete(struct urb * urb)121 static void vnt_start_interrupt_urb_complete(struct urb *urb)
122 {
123 struct vnt_private *priv = urb->context;
124 int status = urb->status;
125
126 switch (status) {
127 case 0:
128 case -ETIMEDOUT:
129 break;
130 case -ECONNRESET:
131 case -ENOENT:
132 case -ESHUTDOWN:
133 priv->int_buf.in_use = false;
134 return;
135 default:
136 break;
137 }
138
139 if (status) {
140 priv->int_buf.in_use = false;
141
142 dev_dbg(&priv->usb->dev, "%s status = %d\n", __func__, status);
143 } else {
144 vnt_int_process_data(priv);
145 }
146
147 status = usb_submit_urb(priv->interrupt_urb, GFP_ATOMIC);
148 if (status)
149 dev_dbg(&priv->usb->dev, "Submit int URB failed %d\n", status);
150 else
151 priv->int_buf.in_use = true;
152 }
153
vnt_start_interrupt_urb(struct vnt_private * priv)154 int vnt_start_interrupt_urb(struct vnt_private *priv)
155 {
156 int ret = 0;
157
158 if (priv->int_buf.in_use) {
159 ret = -EBUSY;
160 goto err;
161 }
162
163 priv->int_buf.in_use = true;
164
165 usb_fill_int_urb(priv->interrupt_urb,
166 priv->usb,
167 usb_rcvintpipe(priv->usb, 1),
168 priv->int_buf.data_buf,
169 MAX_INTERRUPT_SIZE,
170 vnt_start_interrupt_urb_complete,
171 priv,
172 priv->int_interval);
173
174 ret = usb_submit_urb(priv->interrupt_urb, GFP_ATOMIC);
175 if (ret) {
176 dev_dbg(&priv->usb->dev, "Submit int URB failed %d\n", ret);
177 goto err_submit;
178 }
179
180 return 0;
181
182 err_submit:
183 priv->int_buf.in_use = false;
184 err:
185 return ret;
186 }
187
vnt_submit_rx_urb_complete(struct urb * urb)188 static void vnt_submit_rx_urb_complete(struct urb *urb)
189 {
190 struct vnt_rcb *rcb = urb->context;
191 struct vnt_private *priv = rcb->priv;
192
193 switch (urb->status) {
194 case 0:
195 break;
196 case -ECONNRESET:
197 case -ENOENT:
198 case -ESHUTDOWN:
199 return;
200 case -ETIMEDOUT:
201 default:
202 dev_dbg(&priv->usb->dev, "BULK In failed %d\n", urb->status);
203 break;
204 }
205
206 if (urb->actual_length) {
207 if (vnt_rx_data(priv, rcb, urb->actual_length)) {
208 rcb->skb = dev_alloc_skb(priv->rx_buf_sz);
209 if (!rcb->skb) {
210 rcb->in_use = false;
211 return;
212 }
213 } else {
214 skb_push(rcb->skb, skb_headroom(rcb->skb));
215 skb_trim(rcb->skb, 0);
216 }
217
218 urb->transfer_buffer = skb_put(rcb->skb,
219 skb_tailroom(rcb->skb));
220 }
221
222 if (usb_submit_urb(urb, GFP_ATOMIC)) {
223 dev_dbg(&priv->usb->dev, "Failed to re submit rx skb\n");
224
225 rcb->in_use = false;
226 }
227 }
228
vnt_submit_rx_urb(struct vnt_private * priv,struct vnt_rcb * rcb)229 int vnt_submit_rx_urb(struct vnt_private *priv, struct vnt_rcb *rcb)
230 {
231 int ret = 0;
232 struct urb *urb = rcb->urb;
233
234 if (!rcb->skb) {
235 dev_dbg(&priv->usb->dev, "rcb->skb is null\n");
236 ret = -EINVAL;
237 goto end;
238 }
239
240 usb_fill_bulk_urb(urb,
241 priv->usb,
242 usb_rcvbulkpipe(priv->usb, 2),
243 skb_put(rcb->skb, skb_tailroom(rcb->skb)),
244 MAX_TOTAL_SIZE_WITH_ALL_HEADERS,
245 vnt_submit_rx_urb_complete,
246 rcb);
247
248 ret = usb_submit_urb(urb, GFP_ATOMIC);
249 if (ret) {
250 dev_dbg(&priv->usb->dev, "Submit Rx URB failed %d\n", ret);
251 goto end;
252 }
253
254 rcb->in_use = true;
255
256 end:
257 return ret;
258 }
259
vnt_tx_context_complete(struct urb * urb)260 static void vnt_tx_context_complete(struct urb *urb)
261 {
262 struct vnt_usb_send_context *context = urb->context;
263 struct vnt_private *priv = context->priv;
264
265 switch (urb->status) {
266 case 0:
267 dev_dbg(&priv->usb->dev, "Write %d bytes\n", context->buf_len);
268 break;
269 case -ECONNRESET:
270 case -ENOENT:
271 case -ESHUTDOWN:
272 context->in_use = false;
273 return;
274 case -ETIMEDOUT:
275 default:
276 dev_dbg(&priv->usb->dev, "BULK Out failed %d\n", urb->status);
277 break;
278 }
279
280 if (context->type == CONTEXT_DATA_PACKET)
281 ieee80211_wake_queues(priv->hw);
282
283 if (urb->status || context->type == CONTEXT_BEACON_PACKET) {
284 if (context->skb)
285 ieee80211_free_txskb(priv->hw, context->skb);
286
287 context->in_use = false;
288 }
289 }
290
vnt_tx_context(struct vnt_private * priv,struct vnt_usb_send_context * context)291 int vnt_tx_context(struct vnt_private *priv,
292 struct vnt_usb_send_context *context)
293 {
294 int status;
295 struct urb *urb = context->urb;
296
297 if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags)) {
298 context->in_use = false;
299 return STATUS_RESOURCES;
300 }
301
302 usb_fill_bulk_urb(urb,
303 priv->usb,
304 usb_sndbulkpipe(priv->usb, 3),
305 context->data,
306 context->buf_len,
307 vnt_tx_context_complete,
308 context);
309
310 status = usb_submit_urb(urb, GFP_ATOMIC);
311 if (status) {
312 dev_dbg(&priv->usb->dev, "Submit Tx URB failed %d\n", status);
313
314 context->in_use = false;
315 return STATUS_FAILURE;
316 }
317
318 return STATUS_PENDING;
319 }
320
