1 /*
2 * Benq DC E300 subdriver
3 *
4 * Copyright (C) 2009 Jean-Francois Moine (http://moinejf.free.fr)
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23 #define MODULE_NAME "benq"
24
25 #include "gspca.h"
26
27 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
28 MODULE_DESCRIPTION("Benq DC E300 USB Camera Driver");
29 MODULE_LICENSE("GPL");
30
31 /* specific webcam descriptor */
32 struct sd {
33 struct gspca_dev gspca_dev; /* !! must be the first item */
34 };
35
36 static const struct v4l2_pix_format vga_mode[] = {
37 {320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
38 .bytesperline = 320,
39 .sizeimage = 320 * 240 * 3 / 8 + 590,
40 .colorspace = V4L2_COLORSPACE_JPEG},
41 };
42
43 static void sd_isoc_irq(struct urb *urb);
44
45 /* -- write a register -- */
reg_w(struct gspca_dev * gspca_dev,u16 value,u16 index)46 static void reg_w(struct gspca_dev *gspca_dev,
47 u16 value, u16 index)
48 {
49 struct usb_device *dev = gspca_dev->dev;
50 int ret;
51
52 if (gspca_dev->usb_err < 0)
53 return;
54 ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
55 0x02,
56 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
57 value,
58 index,
59 NULL,
60 0,
61 500);
62 if (ret < 0) {
63 pr_err("reg_w err %d\n", ret);
64 gspca_dev->usb_err = ret;
65 }
66 }
67
68 /* this function is called at probe time */
sd_config(struct gspca_dev * gspca_dev,const struct usb_device_id * id)69 static int sd_config(struct gspca_dev *gspca_dev,
70 const struct usb_device_id *id)
71 {
72 gspca_dev->cam.cam_mode = vga_mode;
73 gspca_dev->cam.nmodes = ARRAY_SIZE(vga_mode);
74 gspca_dev->cam.no_urb_create = 1;
75 return 0;
76 }
77
78 /* this function is called at probe and resume time */
sd_init(struct gspca_dev * gspca_dev)79 static int sd_init(struct gspca_dev *gspca_dev)
80 {
81 return 0;
82 }
83
84 /* -- start the camera -- */
sd_start(struct gspca_dev * gspca_dev)85 static int sd_start(struct gspca_dev *gspca_dev)
86 {
87 struct urb *urb;
88 int i, n;
89
90 /* create 4 URBs - 2 on endpoint 0x83 and 2 on 0x082 */
91 #if MAX_NURBS < 4
92 #error "Not enough URBs in the gspca table"
93 #endif
94 #define SD_PKT_SZ 64
95 #define SD_NPKT 32
96 for (n = 0; n < 4; n++) {
97 urb = usb_alloc_urb(SD_NPKT, GFP_KERNEL);
98 if (!urb) {
99 pr_err("usb_alloc_urb failed\n");
100 return -ENOMEM;
101 }
102 gspca_dev->urb[n] = urb;
103 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
104 SD_PKT_SZ * SD_NPKT,
105 GFP_KERNEL,
106 &urb->transfer_dma);
107
108 if (urb->transfer_buffer == NULL) {
109 pr_err("usb_alloc_coherent failed\n");
110 return -ENOMEM;
111 }
112 urb->dev = gspca_dev->dev;
113 urb->context = gspca_dev;
114 urb->transfer_buffer_length = SD_PKT_SZ * SD_NPKT;
115 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
116 n & 1 ? 0x82 : 0x83);
117 urb->transfer_flags = URB_ISO_ASAP
118 | URB_NO_TRANSFER_DMA_MAP;
119 urb->interval = 1;
120 urb->complete = sd_isoc_irq;
121 urb->number_of_packets = SD_NPKT;
122 for (i = 0; i < SD_NPKT; i++) {
123 urb->iso_frame_desc[i].length = SD_PKT_SZ;
124 urb->iso_frame_desc[i].offset = SD_PKT_SZ * i;
125 }
126 }
127
128 return gspca_dev->usb_err;
129 }
130
sd_stopN(struct gspca_dev * gspca_dev)131 static void sd_stopN(struct gspca_dev *gspca_dev)
132 {
133 struct usb_interface *intf;
134
135 reg_w(gspca_dev, 0x003c, 0x0003);
136 reg_w(gspca_dev, 0x003c, 0x0004);
137 reg_w(gspca_dev, 0x003c, 0x0005);
138 reg_w(gspca_dev, 0x003c, 0x0006);
139 reg_w(gspca_dev, 0x003c, 0x0007);
140
141 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
142 usb_set_interface(gspca_dev->dev, gspca_dev->iface,
143 intf->num_altsetting - 1);
144 }
145
sd_pkt_scan(struct gspca_dev * gspca_dev,u8 * data,int len)146 static void sd_pkt_scan(struct gspca_dev *gspca_dev,
147 u8 *data, /* isoc packet */
148 int len) /* iso packet length */
149 {
150 /* unused */
151 }
152
153 /* reception of an URB */
sd_isoc_irq(struct urb * urb)154 static void sd_isoc_irq(struct urb *urb)
155 {
156 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
157 struct urb *urb0;
158 u8 *data;
159 int i, st;
160
161 PDEBUG(D_PACK, "sd isoc irq");
162 if (!gspca_dev->streaming)
163 return;
164 if (urb->status != 0) {
165 if (urb->status == -ESHUTDOWN)
166 return; /* disconnection */
167 #ifdef CONFIG_PM
168 if (gspca_dev->frozen)
169 return;
170 #endif
171 pr_err("urb status: %d\n", urb->status);
172 return;
173 }
174
175 /* if this is a control URN (ep 0x83), wait */
176 if (urb == gspca_dev->urb[0] || urb == gspca_dev->urb[2])
177 return;
178
179 /* scan both received URBs */
180 if (urb == gspca_dev->urb[1])
181 urb0 = gspca_dev->urb[0];
182 else
183 urb0 = gspca_dev->urb[2];
184 for (i = 0; i < urb->number_of_packets; i++) {
185
186 /* check the packet status and length */
187 if (urb0->iso_frame_desc[i].actual_length != SD_PKT_SZ
188 || urb->iso_frame_desc[i].actual_length != SD_PKT_SZ) {
189 PERR("ISOC bad lengths %d / %d",
190 urb0->iso_frame_desc[i].actual_length,
191 urb->iso_frame_desc[i].actual_length);
192 gspca_dev->last_packet_type = DISCARD_PACKET;
193 continue;
194 }
195 st = urb0->iso_frame_desc[i].status;
196 if (st == 0)
197 st = urb->iso_frame_desc[i].status;
198 if (st) {
199 pr_err("ISOC data error: [%d] status=%d\n",
200 i, st);
201 gspca_dev->last_packet_type = DISCARD_PACKET;
202 continue;
203 }
204
205 /*
206 * The images are received in URBs of different endpoints
207 * (0x83 and 0x82).
208 * Image pieces in URBs of ep 0x83 are continuated in URBs of
209 * ep 0x82 of the same index.
210 * The packets in the URBs of endpoint 0x83 start with:
211 * - 80 ba/bb 00 00 = start of image followed by 'ff d8'
212 * - 04 ba/bb oo oo = image piece
213 * where 'oo oo' is the image offset
214 (not cheked)
215 * - (other -> bad frame)
216 * The images are JPEG encoded with full header and
217 * normal ff escape.
218 * The end of image ('ff d9') may occur in any URB.
219 * (not cheked)
220 */
221 data = (u8 *) urb0->transfer_buffer
222 + urb0->iso_frame_desc[i].offset;
223 if (data[0] == 0x80 && (data[1] & 0xfe) == 0xba) {
224
225 /* new image */
226 gspca_frame_add(gspca_dev, LAST_PACKET,
227 NULL, 0);
228 gspca_frame_add(gspca_dev, FIRST_PACKET,
229 data + 4, SD_PKT_SZ - 4);
230 } else if (data[0] == 0x04 && (data[1] & 0xfe) == 0xba) {
231 gspca_frame_add(gspca_dev, INTER_PACKET,
232 data + 4, SD_PKT_SZ - 4);
233 } else {
234 gspca_dev->last_packet_type = DISCARD_PACKET;
235 continue;
236 }
237 data = (u8 *) urb->transfer_buffer
238 + urb->iso_frame_desc[i].offset;
239 gspca_frame_add(gspca_dev, INTER_PACKET,
240 data, SD_PKT_SZ);
241 }
242
243 /* resubmit the URBs */
244 st = usb_submit_urb(urb0, GFP_ATOMIC);
245 if (st < 0)
246 pr_err("usb_submit_urb(0) ret %d\n", st);
247 st = usb_submit_urb(urb, GFP_ATOMIC);
248 if (st < 0)
249 pr_err("usb_submit_urb() ret %d\n", st);
250 }
251
252 /* sub-driver description */
253 static const struct sd_desc sd_desc = {
254 .name = MODULE_NAME,
255 .config = sd_config,
256 .init = sd_init,
257 .start = sd_start,
258 .stopN = sd_stopN,
259 .pkt_scan = sd_pkt_scan,
260 };
261
262 /* -- module initialisation -- */
263 static const struct usb_device_id device_table[] = {
264 {USB_DEVICE(0x04a5, 0x3035)},
265 {}
266 };
267 MODULE_DEVICE_TABLE(usb, device_table);
268
269 /* -- device connect -- */
sd_probe(struct usb_interface * intf,const struct usb_device_id * id)270 static int sd_probe(struct usb_interface *intf,
271 const struct usb_device_id *id)
272 {
273 return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
274 THIS_MODULE);
275 }
276
277 static struct usb_driver sd_driver = {
278 .name = MODULE_NAME,
279 .id_table = device_table,
280 .probe = sd_probe,
281 .disconnect = gspca_disconnect,
282 #ifdef CONFIG_PM
283 .suspend = gspca_suspend,
284 .resume = gspca_resume,
285 .reset_resume = gspca_resume,
286 #endif
287 };
288
289 module_usb_driver(sd_driver);
290