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

  1 /*
  2  * gspca ViCam subdriver
  3  *
  4  * Copyright (C) 2011 Hans de Goede <hdegoede@redhat.com>
  5  *
  6  * Based on the usbvideo vicam driver, which is:
  7  *
  8  * Copyright (c) 2002 Joe Burks (jburks@wavicle.org),
  9  *                    Chris Cheney (chris.cheney@gmail.com),
 10  *                    Pavel Machek (pavel@ucw.cz),
 11  *                    John Tyner (jtyner@cs.ucr.edu),
 12  *                    Monroe Williams (monroe@pobox.com)
 13  *
 14  * This program is free software; you can redistribute it and/or modify
 15  * it under the terms of the GNU General Public License as published by
 16  * the Free Software Foundation; either version 2 of the License, or
 17  * any later version.
 18  *
 19  * This program is distributed in the hope that it will be useful,
 20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 22  * GNU General Public License for more details.
 23  *
 24  * You should have received a copy of the GNU General Public License
 25  * along with this program; if not, write to the Free Software
 26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 27  */
 28 
 29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 30 
 31 #define MODULE_NAME "vicam"
 32 #define HEADER_SIZE 64
 33 
 34 #include <linux/workqueue.h>
 35 #include <linux/slab.h>
 36 #include <linux/firmware.h>
 37 #include <linux/ihex.h>
 38 #include "gspca.h"
 39 
 40 #define VICAM_FIRMWARE "vicam/firmware.fw"
 41 
 42 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 43 MODULE_DESCRIPTION("GSPCA ViCam USB Camera Driver");
 44 MODULE_LICENSE("GPL");
 45 MODULE_FIRMWARE(VICAM_FIRMWARE);
 46 
 47 struct sd {
 48         struct gspca_dev gspca_dev;     /* !! must be the first item */
 49         struct work_struct work_struct;
 50         struct workqueue_struct *work_thread;
 51 };
 52 
 53 /* The vicam sensor has a resolution of 512 x 244, with I believe square
 54    pixels, but this is forced to a 4:3 ratio by optics. So it has
 55    non square pixels :( */
 56 static struct v4l2_pix_format vicam_mode[] = {
 57         { 256, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
 58                 .bytesperline = 256,
 59                 .sizeimage = 256 * 122,
 60                 .colorspace = V4L2_COLORSPACE_SRGB,},
 61         /* 2 modes with somewhat more square pixels */
 62         { 256, 200, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
 63                 .bytesperline = 256,
 64                 .sizeimage = 256 * 200,
 65                 .colorspace = V4L2_COLORSPACE_SRGB,},
 66         { 256, 240, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
 67                 .bytesperline = 256,
 68                 .sizeimage = 256 * 240,
 69                 .colorspace = V4L2_COLORSPACE_SRGB,},
 70 #if 0   /* This mode has extremely non square pixels, testing use only */
 71         { 512, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
 72                 .bytesperline = 512,
 73                 .sizeimage = 512 * 122,
 74                 .colorspace = V4L2_COLORSPACE_SRGB,},
 75 #endif
 76         { 512, 244, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
 77                 .bytesperline = 512,
 78                 .sizeimage = 512 * 244,
 79                 .colorspace = V4L2_COLORSPACE_SRGB,},
 80 };
 81 
 82 static int vicam_control_msg(struct gspca_dev *gspca_dev, u8 request,
 83         u16 value, u16 index, u8 *data, u16 len)
 84 {
 85         int ret;
 86 
 87         ret = usb_control_msg(gspca_dev->dev,
 88                               usb_sndctrlpipe(gspca_dev->dev, 0),
 89                               request,
 90                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 91                               value, index, data, len, 1000);
 92         if (ret < 0)
 93                 pr_err("control msg req %02X error %d\n", request, ret);
 94 
 95         return ret;
 96 }
 97 
 98 static int vicam_set_camera_power(struct gspca_dev *gspca_dev, int state)
 99 {
100         int ret;
101 
102         ret = vicam_control_msg(gspca_dev, 0x50, state, 0, NULL, 0);
103         if (ret < 0)
104                 return ret;
105 
106         if (state)
107                 ret = vicam_control_msg(gspca_dev, 0x55, 1, 0, NULL, 0);
108 
109         return ret;
110 }
111 
112 /*
113  *  request and read a block of data
114  */
115 static int vicam_read_frame(struct gspca_dev *gspca_dev, u8 *data, int size)
116 {
117         int ret, unscaled_height, act_len = 0;
118         u8 *req_data = gspca_dev->usb_buf;
119         s32 expo = v4l2_ctrl_g_ctrl(gspca_dev->exposure);
120         s32 gain = v4l2_ctrl_g_ctrl(gspca_dev->gain);
121 
122         memset(req_data, 0, 16);
123         req_data[0] = gain;
124         if (gspca_dev->pixfmt.width == 256)
125                 req_data[1] |= 0x01; /* low nibble x-scale */
126         if (gspca_dev->pixfmt.height <= 122) {
127                 req_data[1] |= 0x10; /* high nibble y-scale */
128                 unscaled_height = gspca_dev->pixfmt.height * 2;
129         } else
130                 unscaled_height = gspca_dev->pixfmt.height;
131         req_data[2] = 0x90; /* unknown, does not seem to do anything */
132         if (unscaled_height <= 200)
133                 req_data[3] = 0x06; /* vend? */
134         else if (unscaled_height <= 242) /* Yes 242 not 240 */
135                 req_data[3] = 0x07; /* vend? */
136         else /* Up to 244 lines with req_data[3] == 0x08 */
137                 req_data[3] = 0x08; /* vend? */
138 
139         if (expo < 256) {
140                 /* Frame rate maxed out, use partial frame expo time */
141                 req_data[4] = 255 - expo;
142                 req_data[5] = 0x00;
143                 req_data[6] = 0x00;
144                 req_data[7] = 0x01;
145         } else {
146                 /* Modify frame rate */
147                 req_data[4] = 0x00;
148                 req_data[5] = 0x00;
149                 req_data[6] = expo & 0xFF;
150                 req_data[7] = expo >> 8;
151         }
152         req_data[8] = ((244 - unscaled_height) / 2) & ~0x01; /* vstart */
153         /* bytes 9-15 do not seem to affect exposure or image quality */
154 
155         mutex_lock(&gspca_dev->usb_lock);
156         ret = vicam_control_msg(gspca_dev, 0x51, 0x80, 0, req_data, 16);
157         mutex_unlock(&gspca_dev->usb_lock);
158         if (ret < 0)
159                 return ret;
160 
161         ret = usb_bulk_msg(gspca_dev->dev,
162                            usb_rcvbulkpipe(gspca_dev->dev, 0x81),
163                            data, size, &act_len, 10000);
164         /* successful, it returns 0, otherwise  negative */
165         if (ret < 0 || act_len != size) {
166                 pr_err("bulk read fail (%d) len %d/%d\n",
167                        ret, act_len, size);
168                 return -EIO;
169         }
170         return 0;
171 }
172 
173 /*
174  * This function is called as a workqueue function and runs whenever the camera
175  * is streaming data. Because it is a workqueue function it is allowed to sleep
176  * so we can use synchronous USB calls. To avoid possible collisions with other
177  * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
178  * performing USB operations using it. In practice we don't really need this
179  * as the cameras controls are only written from the workqueue.
180  */
181 static void vicam_dostream(struct work_struct *work)
182 {
183         struct sd *sd = container_of(work, struct sd, work_struct);
184         struct gspca_dev *gspca_dev = &sd->gspca_dev;
185         int ret, frame_sz;
186         u8 *buffer;
187 
188         frame_sz = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].sizeimage +
189                    HEADER_SIZE;
190         buffer = kmalloc(frame_sz, GFP_KERNEL | GFP_DMA);
191         if (!buffer) {
192                 pr_err("Couldn't allocate USB buffer\n");
193                 goto exit;
194         }
195 
196         while (gspca_dev->present && gspca_dev->streaming) {
197 #ifdef CONFIG_PM
198                 if (gspca_dev->frozen)
199                         break;
200 #endif
201                 ret = vicam_read_frame(gspca_dev, buffer, frame_sz);
202                 if (ret < 0)
203                         break;
204 
205                 /* Note the frame header contents seem to be completely
206                    constant, they do not change with either image, or
207                    settings. So we simply discard it. The frames have
208                    a very similar 64 byte footer, which we don't even
209                    bother reading from the cam */
210                 gspca_frame_add(gspca_dev, FIRST_PACKET,
211                                 buffer + HEADER_SIZE,
212                                 frame_sz - HEADER_SIZE);
213                 gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
214         }
215 exit:
216         kfree(buffer);
217 }
218 
219 /* This function is called at probe time just before sd_init */
220 static int sd_config(struct gspca_dev *gspca_dev,
221                 const struct usb_device_id *id)
222 {
223         struct cam *cam = &gspca_dev->cam;
224         struct sd *sd = (struct sd *)gspca_dev;
225 
226         /* We don't use the buffer gspca allocates so make it small. */
227         cam->bulk = 1;
228         cam->bulk_size = 64;
229         cam->cam_mode = vicam_mode;
230         cam->nmodes = ARRAY_SIZE(vicam_mode);
231 
232         INIT_WORK(&sd->work_struct, vicam_dostream);
233 
234         return 0;
235 }
236 
237 /* this function is called at probe and resume time */
238 static int sd_init(struct gspca_dev *gspca_dev)
239 {
240         int ret;
241         const struct ihex_binrec *rec;
242         const struct firmware *uninitialized_var(fw);
243         u8 *firmware_buf;
244 
245         ret = request_ihex_firmware(&fw, VICAM_FIRMWARE,
246                                     &gspca_dev->dev->dev);
247         if (ret) {
248                 pr_err("Failed to load \"vicam/firmware.fw\": %d\n", ret);
249                 return ret;
250         }
251 
252         firmware_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
253         if (!firmware_buf) {
254                 ret = -ENOMEM;
255                 goto exit;
256         }
257         for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
258                 memcpy(firmware_buf, rec->data, be16_to_cpu(rec->len));
259                 ret = vicam_control_msg(gspca_dev, 0xff, 0, 0, firmware_buf,
260                                         be16_to_cpu(rec->len));
261                 if (ret < 0)
262                         break;
263         }
264 
265         kfree(firmware_buf);
266 exit:
267         release_firmware(fw);
268         return ret;
269 }
270 
271 /* Set up for getting frames. */
272 static int sd_start(struct gspca_dev *gspca_dev)
273 {
274         struct sd *sd = (struct sd *)gspca_dev;
275         int ret;
276 
277         ret = vicam_set_camera_power(gspca_dev, 1);
278         if (ret < 0)
279                 return ret;
280 
281         /* Start the workqueue function to do the streaming */
282         sd->work_thread = create_singlethread_workqueue(MODULE_NAME);
283         queue_work(sd->work_thread, &sd->work_struct);
284 
285         return 0;
286 }
287 
288 /* called on streamoff with alt==0 and on disconnect */
289 /* the usb_lock is held at entry - restore on exit */
290 static void sd_stop0(struct gspca_dev *gspca_dev)
291 {
292         struct sd *dev = (struct sd *)gspca_dev;
293 
294         /* wait for the work queue to terminate */
295         mutex_unlock(&gspca_dev->usb_lock);
296         /* This waits for vicam_dostream to finish */
297         destroy_workqueue(dev->work_thread);
298         dev->work_thread = NULL;
299         mutex_lock(&gspca_dev->usb_lock);
300 
301         if (gspca_dev->present)
302                 vicam_set_camera_power(gspca_dev, 0);
303 }
304 
305 static int sd_init_controls(struct gspca_dev *gspca_dev)
306 {
307         struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;
308 
309         gspca_dev->vdev.ctrl_handler = hdl;
310         v4l2_ctrl_handler_init(hdl, 2);
311         gspca_dev->exposure = v4l2_ctrl_new_std(hdl, NULL,
312                         V4L2_CID_EXPOSURE, 0, 2047, 1, 256);
313         gspca_dev->gain = v4l2_ctrl_new_std(hdl, NULL,
314                         V4L2_CID_GAIN, 0, 255, 1, 200);
315 
316         if (hdl->error) {
317                 pr_err("Could not initialize controls\n");
318                 return hdl->error;
319         }
320         return 0;
321 }
322 
323 /* Table of supported USB devices */
324 static const struct usb_device_id device_table[] = {
325         {USB_DEVICE(0x04c1, 0x009d)},
326         {USB_DEVICE(0x0602, 0x1001)},
327         {}
328 };
329 
330 MODULE_DEVICE_TABLE(usb, device_table);
331 
332 /* sub-driver description */
333 static const struct sd_desc sd_desc = {
334         .name   = MODULE_NAME,
335         .config = sd_config,
336         .init   = sd_init,
337         .init_controls = sd_init_controls,
338         .start  = sd_start,
339         .stop0  = sd_stop0,
340 };
341 
342 /* -- device connect -- */
343 static int sd_probe(struct usb_interface *intf,
344                 const struct usb_device_id *id)
345 {
346         return gspca_dev_probe(intf, id,
347                         &sd_desc,
348                         sizeof(struct sd),
349                         THIS_MODULE);
350 }
351 
352 static struct usb_driver sd_driver = {
353         .name       = MODULE_NAME,
354         .id_table   = device_table,
355         .probe      = sd_probe,
356         .disconnect = gspca_disconnect,
357 #ifdef CONFIG_PM
358         .suspend = gspca_suspend,
359         .resume  = gspca_resume,
360         .reset_resume = gspca_resume,
361 #endif
362 };
363 
364 module_usb_driver(sd_driver);
365 

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