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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                         return -ENOMEM;
100                 gspca_dev->urb[n] = urb;
101                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
102                                                 SD_PKT_SZ * SD_NPKT,
103                                                 GFP_KERNEL,
104                                                 &urb->transfer_dma);
105 
106                 if (urb->transfer_buffer == NULL) {
107                         pr_err("usb_alloc_coherent failed\n");
108                         return -ENOMEM;
109                 }
110                 urb->dev = gspca_dev->dev;
111                 urb->context = gspca_dev;
112                 urb->transfer_buffer_length = SD_PKT_SZ * SD_NPKT;
113                 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
114                                         n & 1 ? 0x82 : 0x83);
115                 urb->transfer_flags = URB_ISO_ASAP
116                                         | URB_NO_TRANSFER_DMA_MAP;
117                 urb->interval = 1;
118                 urb->complete = sd_isoc_irq;
119                 urb->number_of_packets = SD_NPKT;
120                 for (i = 0; i < SD_NPKT; i++) {
121                         urb->iso_frame_desc[i].length = SD_PKT_SZ;
122                         urb->iso_frame_desc[i].offset = SD_PKT_SZ * i;
123                 }
124         }
125 
126         return gspca_dev->usb_err;
127 }
128 
129 static void sd_stopN(struct gspca_dev *gspca_dev)
130 {
131         struct usb_interface *intf;
132 
133         reg_w(gspca_dev, 0x003c, 0x0003);
134         reg_w(gspca_dev, 0x003c, 0x0004);
135         reg_w(gspca_dev, 0x003c, 0x0005);
136         reg_w(gspca_dev, 0x003c, 0x0006);
137         reg_w(gspca_dev, 0x003c, 0x0007);
138 
139         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
140         usb_set_interface(gspca_dev->dev, gspca_dev->iface,
141                                         intf->num_altsetting - 1);
142 }
143 
144 static void sd_pkt_scan(struct gspca_dev *gspca_dev,
145                         u8 *data,               /* isoc packet */
146                         int len)                /* iso packet length */
147 {
148         /* unused */
149 }
150 
151 /* reception of an URB */
152 static void sd_isoc_irq(struct urb *urb)
153 {
154         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
155         struct urb *urb0;
156         u8 *data;
157         int i, st;
158 
159         PDEBUG(D_PACK, "sd isoc irq");
160         if (!gspca_dev->streaming)
161                 return;
162         if (urb->status != 0) {
163                 if (urb->status == -ESHUTDOWN)
164                         return;         /* disconnection */
165 #ifdef CONFIG_PM
166                 if (gspca_dev->frozen)
167                         return;
168 #endif
169                 pr_err("urb status: %d\n", urb->status);
170                 return;
171         }
172 
173         /* if this is a control URN (ep 0x83), wait */
174         if (urb == gspca_dev->urb[0] || urb == gspca_dev->urb[2])
175                 return;
176 
177         /* scan both received URBs */
178         if (urb == gspca_dev->urb[1])
179                 urb0 = gspca_dev->urb[0];
180         else
181                 urb0 = gspca_dev->urb[2];
182         for (i = 0; i < urb->number_of_packets; i++) {
183 
184                 /* check the packet status and length */
185                 if (urb0->iso_frame_desc[i].actual_length != SD_PKT_SZ
186                     || urb->iso_frame_desc[i].actual_length != SD_PKT_SZ) {
187                         PERR("ISOC bad lengths %d / %d",
188                                 urb0->iso_frame_desc[i].actual_length,
189                                 urb->iso_frame_desc[i].actual_length);
190                         gspca_dev->last_packet_type = DISCARD_PACKET;
191                         continue;
192                 }
193                 st = urb0->iso_frame_desc[i].status;
194                 if (st == 0)
195                         st = urb->iso_frame_desc[i].status;
196                 if (st) {
197                         pr_err("ISOC data error: [%d] status=%d\n",
198                                 i, st);
199                         gspca_dev->last_packet_type = DISCARD_PACKET;
200                         continue;
201                 }
202 
203                 /*
204                  * The images are received in URBs of different endpoints
205                  * (0x83 and 0x82).
206                  * Image pieces in URBs of ep 0x83 are continuated in URBs of
207                  * ep 0x82 of the same index.
208                  * The packets in the URBs of endpoint 0x83 start with:
209                  *      - 80 ba/bb 00 00 = start of image followed by 'ff d8'
210                  *      - 04 ba/bb oo oo = image piece
211                  *              where 'oo oo' is the image offset
212                                                 (not cheked)
213                  *      - (other -> bad frame)
214                  * The images are JPEG encoded with full header and
215                  * normal ff escape.
216                  * The end of image ('ff d9') may occur in any URB.
217                  * (not cheked)
218                  */
219                 data = (u8 *) urb0->transfer_buffer
220                                         + urb0->iso_frame_desc[i].offset;
221                 if (data[0] == 0x80 && (data[1] & 0xfe) == 0xba) {
222 
223                         /* new image */
224                         gspca_frame_add(gspca_dev, LAST_PACKET,
225                                         NULL, 0);
226                         gspca_frame_add(gspca_dev, FIRST_PACKET,
227                                         data + 4, SD_PKT_SZ - 4);
228                 } else if (data[0] == 0x04 && (data[1] & 0xfe) == 0xba) {
229                         gspca_frame_add(gspca_dev, INTER_PACKET,
230                                         data + 4, SD_PKT_SZ - 4);
231                 } else {
232                         gspca_dev->last_packet_type = DISCARD_PACKET;
233                         continue;
234                 }
235                 data = (u8 *) urb->transfer_buffer
236                                         + urb->iso_frame_desc[i].offset;
237                 gspca_frame_add(gspca_dev, INTER_PACKET,
238                                 data, SD_PKT_SZ);
239         }
240 
241         /* resubmit the URBs */
242         st = usb_submit_urb(urb0, GFP_ATOMIC);
243         if (st < 0)
244                 pr_err("usb_submit_urb(0) ret %d\n", st);
245         st = usb_submit_urb(urb, GFP_ATOMIC);
246         if (st < 0)
247                 pr_err("usb_submit_urb() ret %d\n", st);
248 }
249 
250 /* sub-driver description */
251 static const struct sd_desc sd_desc = {
252         .name = MODULE_NAME,
253         .config = sd_config,
254         .init = sd_init,
255         .start = sd_start,
256         .stopN = sd_stopN,
257         .pkt_scan = sd_pkt_scan,
258 };
259 
260 /* -- module initialisation -- */
261 static const struct usb_device_id device_table[] = {
262         {USB_DEVICE(0x04a5, 0x3035)},
263         {}
264 };
265 MODULE_DEVICE_TABLE(usb, device_table);
266 
267 /* -- device connect -- */
268 static int sd_probe(struct usb_interface *intf,
269                         const struct usb_device_id *id)
270 {
271         return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
272                                 THIS_MODULE);
273 }
274 
275 static struct usb_driver sd_driver = {
276         .name = MODULE_NAME,
277         .id_table = device_table,
278         .probe = sd_probe,
279         .disconnect = gspca_disconnect,
280 #ifdef CONFIG_PM
281         .suspend = gspca_suspend,
282         .resume = gspca_resume,
283         .reset_resume = gspca_resume,
284 #endif
285 };
286 
287 module_usb_driver(sd_driver);
288 

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