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Linux/drivers/media/usb/gspca/sq905c.c

  1 /*
  2  * SQ905C subdriver
  3  *
  4  * Copyright (C) 2009 Theodore Kilgore
  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 /*
 22  *
 23  * This driver uses work done in
 24  * libgphoto2/camlibs/digigr8, Copyright (C) Theodore Kilgore.
 25  *
 26  * This driver has also used as a base the sq905c driver
 27  * and may contain code fragments from it.
 28  */
 29 
 30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 31 
 32 #define MODULE_NAME "sq905c"
 33 
 34 #include <linux/workqueue.h>
 35 #include <linux/slab.h>
 36 #include "gspca.h"
 37 
 38 MODULE_AUTHOR("Theodore Kilgore <kilgota@auburn.edu>");
 39 MODULE_DESCRIPTION("GSPCA/SQ905C USB Camera Driver");
 40 MODULE_LICENSE("GPL");
 41 
 42 /* Default timeouts, in ms */
 43 #define SQ905C_CMD_TIMEOUT 500
 44 #define SQ905C_DATA_TIMEOUT 1000
 45 
 46 /* Maximum transfer size to use. */
 47 #define SQ905C_MAX_TRANSFER 0x8000
 48 
 49 #define FRAME_HEADER_LEN 0x50
 50 
 51 /* Commands. These go in the "value" slot. */
 52 #define SQ905C_CLEAR   0xa0             /* clear everything */
 53 #define SQ905C_GET_ID  0x14f4           /* Read version number */
 54 #define SQ905C_CAPTURE_LOW 0xa040       /* Starts capture at 160x120 */
 55 #define SQ905C_CAPTURE_MED 0x1440       /* Starts capture at 320x240 */
 56 #define SQ905C_CAPTURE_HI 0x2840        /* Starts capture at 320x240 */
 57 
 58 /* For capture, this must go in the "index" slot. */
 59 #define SQ905C_CAPTURE_INDEX 0x110f
 60 
 61 /* Structure to hold all of our device specific stuff */
 62 struct sd {
 63         struct gspca_dev gspca_dev;     /* !! must be the first item */
 64         const struct v4l2_pix_format *cap_mode;
 65         /* Driver stuff */
 66         struct work_struct work_struct;
 67         struct workqueue_struct *work_thread;
 68 };
 69 
 70 /*
 71  * Most of these cameras will do 640x480 and 320x240. 160x120 works
 72  * in theory but gives very poor output. Therefore, not supported.
 73  * The 0x2770:0x9050 cameras have max resolution of 320x240.
 74  */
 75 static struct v4l2_pix_format sq905c_mode[] = {
 76         { 320, 240, V4L2_PIX_FMT_SQ905C, V4L2_FIELD_NONE,
 77                 .bytesperline = 320,
 78                 .sizeimage = 320 * 240,
 79                 .colorspace = V4L2_COLORSPACE_SRGB,
 80                 .priv = 0},
 81         { 640, 480, V4L2_PIX_FMT_SQ905C, V4L2_FIELD_NONE,
 82                 .bytesperline = 640,
 83                 .sizeimage = 640 * 480,
 84                 .colorspace = V4L2_COLORSPACE_SRGB,
 85                 .priv = 0}
 86 };
 87 
 88 /* Send a command to the camera. */
 89 static int sq905c_command(struct gspca_dev *gspca_dev, u16 command, u16 index)
 90 {
 91         int ret;
 92 
 93         ret = usb_control_msg(gspca_dev->dev,
 94                               usb_sndctrlpipe(gspca_dev->dev, 0),
 95                               USB_REQ_SYNCH_FRAME,                /* request */
 96                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 97                               command, index, NULL, 0,
 98                               SQ905C_CMD_TIMEOUT);
 99         if (ret < 0) {
100                 pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret);
101                 return ret;
102         }
103 
104         return 0;
105 }
106 
107 static int sq905c_read(struct gspca_dev *gspca_dev, u16 command, u16 index,
108                        int size)
109 {
110         int ret;
111 
112         ret = usb_control_msg(gspca_dev->dev,
113                               usb_rcvctrlpipe(gspca_dev->dev, 0),
114                               USB_REQ_SYNCH_FRAME,              /* request */
115                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
116                               command, index, gspca_dev->usb_buf, size,
117                               SQ905C_CMD_TIMEOUT);
118         if (ret < 0) {
119                 pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret);
120                 return ret;
121         }
122 
123         return 0;
124 }
125 
126 /*
127  * This function is called as a workqueue function and runs whenever the camera
128  * is streaming data. Because it is a workqueue function it is allowed to sleep
129  * so we can use synchronous USB calls. To avoid possible collisions with other
130  * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
131  * performing USB operations using it. In practice we don't really need this
132  * as the camera doesn't provide any controls.
133  */
134 static void sq905c_dostream(struct work_struct *work)
135 {
136         struct sd *dev = container_of(work, struct sd, work_struct);
137         struct gspca_dev *gspca_dev = &dev->gspca_dev;
138         int bytes_left; /* bytes remaining in current frame. */
139         int data_len;   /* size to use for the next read. */
140         int act_len;
141         int packet_type;
142         int ret;
143         u8 *buffer;
144 
145         buffer = kmalloc(SQ905C_MAX_TRANSFER, GFP_KERNEL | GFP_DMA);
146         if (!buffer) {
147                 pr_err("Couldn't allocate USB buffer\n");
148                 goto quit_stream;
149         }
150 
151         while (gspca_dev->present && gspca_dev->streaming) {
152 #ifdef CONFIG_PM
153                 if (gspca_dev->frozen)
154                         break;
155 #endif
156                 /* Request the header, which tells the size to download */
157                 ret = usb_bulk_msg(gspca_dev->dev,
158                                 usb_rcvbulkpipe(gspca_dev->dev, 0x81),
159                                 buffer, FRAME_HEADER_LEN, &act_len,
160                                 SQ905C_DATA_TIMEOUT);
161                 PDEBUG(D_STREAM,
162                         "Got %d bytes out of %d for header",
163                         act_len, FRAME_HEADER_LEN);
164                 if (ret < 0 || act_len < FRAME_HEADER_LEN)
165                         goto quit_stream;
166                 /* size is read from 4 bytes starting 0x40, little endian */
167                 bytes_left = buffer[0x40]|(buffer[0x41]<<8)|(buffer[0x42]<<16)
168                                         |(buffer[0x43]<<24);
169                 PDEBUG(D_STREAM, "bytes_left = 0x%x", bytes_left);
170                 /* We keep the header. It has other information, too. */
171                 packet_type = FIRST_PACKET;
172                 gspca_frame_add(gspca_dev, packet_type,
173                                 buffer, FRAME_HEADER_LEN);
174                 while (bytes_left > 0 && gspca_dev->present) {
175                         data_len = bytes_left > SQ905C_MAX_TRANSFER ?
176                                 SQ905C_MAX_TRANSFER : bytes_left;
177                         ret = usb_bulk_msg(gspca_dev->dev,
178                                 usb_rcvbulkpipe(gspca_dev->dev, 0x81),
179                                 buffer, data_len, &act_len,
180                                 SQ905C_DATA_TIMEOUT);
181                         if (ret < 0 || act_len < data_len)
182                                 goto quit_stream;
183                         PDEBUG(D_STREAM,
184                                 "Got %d bytes out of %d for frame",
185                                 data_len, bytes_left);
186                         bytes_left -= data_len;
187                         if (bytes_left == 0)
188                                 packet_type = LAST_PACKET;
189                         else
190                                 packet_type = INTER_PACKET;
191                         gspca_frame_add(gspca_dev, packet_type,
192                                         buffer, data_len);
193                 }
194         }
195 quit_stream:
196         if (gspca_dev->present) {
197                 mutex_lock(&gspca_dev->usb_lock);
198                 sq905c_command(gspca_dev, SQ905C_CLEAR, 0);
199                 mutex_unlock(&gspca_dev->usb_lock);
200         }
201         kfree(buffer);
202 }
203 
204 /* This function is called at probe time just before sd_init */
205 static int sd_config(struct gspca_dev *gspca_dev,
206                 const struct usb_device_id *id)
207 {
208         struct cam *cam = &gspca_dev->cam;
209         struct sd *dev = (struct sd *) gspca_dev;
210         int ret;
211 
212         PDEBUG(D_PROBE,
213                 "SQ9050 camera detected"
214                 " (vid/pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
215 
216         ret = sq905c_command(gspca_dev, SQ905C_GET_ID, 0);
217         if (ret < 0) {
218                 PERR("Get version command failed");
219                 return ret;
220         }
221 
222         ret = sq905c_read(gspca_dev, 0xf5, 0, 20);
223         if (ret < 0) {
224                 PERR("Reading version command failed");
225                 return ret;
226         }
227         /* Note we leave out the usb id and the manufacturing date */
228         PDEBUG(D_PROBE,
229                "SQ9050 ID string: %02x - %*ph",
230                 gspca_dev->usb_buf[3], 6, gspca_dev->usb_buf + 14);
231 
232         cam->cam_mode = sq905c_mode;
233         cam->nmodes = 2;
234         if (gspca_dev->usb_buf[15] == 0)
235                 cam->nmodes = 1;
236         /* We don't use the buffer gspca allocates so make it small. */
237         cam->bulk_size = 32;
238         cam->bulk = 1;
239         INIT_WORK(&dev->work_struct, sq905c_dostream);
240         return 0;
241 }
242 
243 /* called on streamoff with alt==0 and on disconnect */
244 /* the usb_lock is held at entry - restore on exit */
245 static void sd_stop0(struct gspca_dev *gspca_dev)
246 {
247         struct sd *dev = (struct sd *) gspca_dev;
248 
249         /* wait for the work queue to terminate */
250         mutex_unlock(&gspca_dev->usb_lock);
251         /* This waits for sq905c_dostream to finish */
252         destroy_workqueue(dev->work_thread);
253         dev->work_thread = NULL;
254         mutex_lock(&gspca_dev->usb_lock);
255 }
256 
257 /* this function is called at probe and resume time */
258 static int sd_init(struct gspca_dev *gspca_dev)
259 {
260         int ret;
261 
262         /* connect to the camera and reset it. */
263         ret = sq905c_command(gspca_dev, SQ905C_CLEAR, 0);
264         return ret;
265 }
266 
267 /* Set up for getting frames. */
268 static int sd_start(struct gspca_dev *gspca_dev)
269 {
270         struct sd *dev = (struct sd *) gspca_dev;
271         int ret;
272 
273         dev->cap_mode = gspca_dev->cam.cam_mode;
274         /* "Open the shutter" and set size, to start capture */
275         switch (gspca_dev->pixfmt.width) {
276         case 640:
277                 PDEBUG(D_STREAM, "Start streaming at high resolution");
278                 dev->cap_mode++;
279                 ret = sq905c_command(gspca_dev, SQ905C_CAPTURE_HI,
280                                                 SQ905C_CAPTURE_INDEX);
281                 break;
282         default: /* 320 */
283         PDEBUG(D_STREAM, "Start streaming at medium resolution");
284                 ret = sq905c_command(gspca_dev, SQ905C_CAPTURE_MED,
285                                                 SQ905C_CAPTURE_INDEX);
286         }
287 
288         if (ret < 0) {
289                 PERR("Start streaming command failed");
290                 return ret;
291         }
292         /* Start the workqueue function to do the streaming */
293         dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
294         queue_work(dev->work_thread, &dev->work_struct);
295 
296         return 0;
297 }
298 
299 /* Table of supported USB devices */
300 static const struct usb_device_id device_table[] = {
301         {USB_DEVICE(0x2770, 0x905c)},
302         {USB_DEVICE(0x2770, 0x9050)},
303         {USB_DEVICE(0x2770, 0x9051)},
304         {USB_DEVICE(0x2770, 0x9052)},
305         {USB_DEVICE(0x2770, 0x913d)},
306         {}
307 };
308 
309 MODULE_DEVICE_TABLE(usb, device_table);
310 
311 /* sub-driver description */
312 static const struct sd_desc sd_desc = {
313         .name   = MODULE_NAME,
314         .config = sd_config,
315         .init   = sd_init,
316         .start  = sd_start,
317         .stop0  = sd_stop0,
318 };
319 
320 /* -- device connect -- */
321 static int sd_probe(struct usb_interface *intf,
322                 const struct usb_device_id *id)
323 {
324         return gspca_dev_probe(intf, id,
325                         &sd_desc,
326                         sizeof(struct sd),
327                         THIS_MODULE);
328 }
329 
330 static struct usb_driver sd_driver = {
331         .name       = MODULE_NAME,
332         .id_table   = device_table,
333         .probe      = sd_probe,
334         .disconnect = gspca_disconnect,
335 #ifdef CONFIG_PM
336         .suspend = gspca_suspend,
337         .resume  = gspca_resume,
338         .reset_resume = gspca_resume,
339 #endif
340 };
341 
342 module_usb_driver(sd_driver);
343 

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