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Linux/drivers/media/usb/gspca/benq.c

  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 -- */
 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 */
 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 */
 79 static int sd_init(struct gspca_dev *gspca_dev)
 80 {
 81         return 0;
 82 }
 83 
 84 /* -- start the camera -- */
 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 
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 
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 */
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 -- */
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 

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