1 /* (C) 1999-2003 Nemosoft Unv. (webcam@smcc.demon.nl)
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License as published by
5 the Free Software Foundation; either version 2 of the License, or
6 (at your option) any later version.
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
13 You should have received a copy of the GNU General Public License
14 along with this program; if not, write to the Free Software
15 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <linux/version.h>
23 #include <linux/config.h>
24 #include <linux/module.h>
25 #include <linux/smp_lock.h>
26 #include <linux/spinlock.h>
27 #include <linux/usb.h>
28 #include <linux/videodev.h>
29 #include <linux/wait.h>
31 #include <asm/semaphore.h>
32 #include <asm/errno.h>
34 #include "pwc-ioctl.h"
36 /* Defines and structures for the Philips webcam */
37 /* Used for checking memory corruption/pointer validation */
38 #define PWC_MAGIC 0x89DC10ABUL
41 /* Turn some debugging options on/off */
44 /* Trace certain actions in the driver */
45 #define TRACE_MODULE 0x0001
46 #define TRACE_PROBE 0x0002
47 #define TRACE_OPEN 0x0004
48 #define TRACE_READ 0x0008
49 #define TRACE_MEMORY 0x0010
50 #define TRACE_FLOW 0x0020
51 #define TRACE_SIZE 0x0040
52 #define TRACE_PWCX 0x0080
53 #define TRACE_SEQUENCE 0x1000
55 #define Trace(R, A...) if (pwc_trace & R) printk(KERN_DEBUG PWC_NAME " " A)
56 #define Debug(A...) printk(KERN_DEBUG PWC_NAME " " A)
57 #define Info(A...) printk(KERN_INFO PWC_NAME " " A)
58 #define Err(A...) printk(KERN_ERR PWC_NAME " " A)
61 /* Defines for ToUCam cameras */
62 #define TOUCAM_HEADER_SIZE 8
63 #define TOUCAM_TRAILER_SIZE 4
65 #define FEATURE_MOTOR_PANTILT 0x0001
70 #define PWC_VERSION "8.12"
71 #define PWC_NAME "pwc"
73 /* Turn certain features on/off */
74 #define PWC_INT_PIPE 0
76 /* Ignore errors in the first N frames, to allow for startup delays */
77 #define FRAME_LOWMARK 5
79 /* Size and number of buffers for the ISO pipe. */
80 #define MAX_ISO_BUFS 2
81 #define ISO_FRAMES_PER_DESC 10
82 #define ISO_MAX_FRAME_SIZE 960
83 #define ISO_BUFFER_SIZE (ISO_FRAMES_PER_DESC * ISO_MAX_FRAME_SIZE)
85 /* Frame buffers: contains compressed or uncompressed video data. */
87 /* Maximum size after decompression is 640x480 YUV data, 1.5 * 640 * 480 */
88 #define PWC_FRAME_SIZE (460800 + TOUCAM_HEADER_SIZE + TOUCAM_TRAILER_SIZE)
90 /* Absolute maximum number of buffers available for mmap() */
95 int x, y; /* guess what */
96 int size; /* size, or offset */
99 /* The following structures were based on cpia.h. Why reinvent the wheel? :-) */
108 /* intermediate buffers with raw data from the USB cam */
112 volatile int filled; /* number of bytes filled */
113 struct pwc_frame_buf *next; /* list */
115 int sequence; /* Sequence number */
121 struct video_device vdev;
125 /* Pointer to our usb_device */
126 struct usb_device *udev;
128 int type; /* type of cam (645, 646, 675, 680, 690, 720, 730, 740, 750) */
129 int release; /* release number */
130 int features; /* feature bits */
131 int error_status; /* set when something goes wrong with the cam (unplugged, USB errors) */
132 int usb_init; /* set when the cam has been initialized over USB */
135 int vopen; /* flag */
136 int vendpoint; /* video isoc endpoint */
137 int vcinterface; /* video control interface */
138 int valternate; /* alternate interface needed */
139 int vframes, vsize; /* frames-per-second & size (see PSZ_*) */
140 int vframe_count; /* received frames */
141 int vframes_dumped; /* counter for dumped frames */
142 int vframes_error; /* frames received in error */
143 int vmax_packet_size; /* USB maxpacket size */
144 int vlast_packet_size; /* for frame synchronisation */
145 int visoc_errors; /* number of contiguous ISOC errors */
146 int vcompression; /* desired compression factor */
147 int vbandlength; /* compressed band length; 0 is uncompressed */
148 char vsnapshot; /* snapshot mode */
149 char vsync; /* used by isoc handler */
150 char vmirror; /* for ToUCaM series */
152 /* The image acquisition requires 3 to 4 steps:
153 1. data is gathered in short packets from the USB controller
154 2. data is synchronized and packed into a frame buffer
155 3a. in case data is compressed, decompress it directly into image buffer
156 3b. in case data is uncompressed, copy into image buffer with viewport
157 4. data is transferred to the user process
159 Note that MAX_ISO_BUFS != MAX_FRAMES != MAX_IMAGES....
160 We have in effect a back-to-back-double-buffer system.
163 struct pwc_iso_buf sbuf[MAX_ISO_BUFS];
167 struct pwc_frame_buf *fbuf; /* all frames */
168 struct pwc_frame_buf *empty_frames, *empty_frames_tail; /* all empty frames */
169 struct pwc_frame_buf *full_frames, *full_frames_tail; /* all filled frames */
170 struct pwc_frame_buf *fill_frame; /* frame currently being filled */
171 struct pwc_frame_buf *read_frame; /* frame currently read by user process */
173 int frame_header_size, frame_trailer_size;
176 int sequence; /* Debugging aid */
179 /* 3: decompression */
180 struct pwc_decompressor *decompressor; /* function block with decompression routines */
181 void *decompress_data; /* private data for decompression engine */
184 /* We have an 'image' and a 'view', where 'image' is the fixed-size image
185 as delivered by the camera, and 'view' is the size requested by the
186 program. The camera image is centered in this viewport, laced with
187 a gray or black border. view_min <= image <= view <= view_max;
189 int image_mask; /* bitmask of supported sizes */
190 struct pwc_coord view_min, view_max; /* minimum and maximum sizes */
191 struct pwc_coord image, view; /* image and viewport size */
192 struct pwc_coord offset; /* offset within the viewport */
194 void *image_data; /* total buffer, which is subdivided into ... */
195 void *image_ptr[MAX_IMAGES]; /* ...several images... */
196 int fill_image; /* ...which are rotated. */
197 int len_per_image; /* length per image */
198 int image_read_pos; /* In case we read data in pieces, keep track of were we are in the imagebuffer */
199 int image_used[MAX_IMAGES]; /* For MCAPTURE and SYNC */
201 struct semaphore modlock; /* to prevent races in video_open(), etc */
202 spinlock_t ptrlock; /* for manipulating the buffer pointers */
204 /*** motorized pan/tilt feature */
205 struct pwc_mpt_range angle_range;
206 int pan_angle; /* in degrees * 100 */
207 int tilt_angle; /* absolute angle; 0,0 is home position */
210 wait_queue_head_t frameq; /* When waiting for a frame to finish... */
212 void *usb_int_handler; /* for the interrupt endpoint */
216 /* Enumeration of image sizes */
217 #define PSZ_SQCIF 0x00
218 #define PSZ_QSIF 0x01
219 #define PSZ_QCIF 0x02
231 /* Global variables */
232 extern int pwc_trace;
233 extern int pwc_preferred_compression;
235 /** functions in pwc-if.c */
236 int pwc_try_video_mode(struct pwc_device *pdev, int width, int height, int new_fps, int new_compression, int new_snapshot);
238 /** Functions in pwc-misc.c */
239 /* sizes in pixels */
240 extern struct pwc_coord pwc_image_sizes[PSZ_MAX];
242 int pwc_decode_size(struct pwc_device *pdev, int width, int height);
243 void pwc_construct(struct pwc_device *pdev);
245 /** Functions in pwc-ctrl.c */
246 /* Request a certain video mode. Returns < 0 if not possible */
247 extern int pwc_set_video_mode(struct pwc_device *pdev, int width, int height, int frames, int compression, int snapshot);
248 /* Calculate the number of bytes per image (not frame) */
249 extern void pwc_set_image_buffer_size(struct pwc_device *pdev);
251 /* Various controls; should be obvious. Value 0..65535, or < 0 on error */
252 extern int pwc_get_brightness(struct pwc_device *pdev);
253 extern int pwc_set_brightness(struct pwc_device *pdev, int value);
254 extern int pwc_get_contrast(struct pwc_device *pdev);
255 extern int pwc_set_contrast(struct pwc_device *pdev, int value);
256 extern int pwc_get_gamma(struct pwc_device *pdev);
257 extern int pwc_set_gamma(struct pwc_device *pdev, int value);
258 extern int pwc_get_saturation(struct pwc_device *pdev);
259 extern int pwc_set_saturation(struct pwc_device *pdev, int value);
260 extern int pwc_set_leds(struct pwc_device *pdev, int on_value, int off_value);
261 extern int pwc_get_leds(struct pwc_device *pdev, int *on_value, int *off_value);
262 extern int pwc_get_cmos_sensor(struct pwc_device *pdev);
264 /* Power down or up the camera; not supported by all models */
265 extern int pwc_camera_power(struct pwc_device *pdev, int power);
267 /* Private ioctl()s; see pwc-ioctl.h */
268 extern int pwc_ioctl(struct pwc_device *pdev, unsigned int cmd, void *arg);
271 /** pwc-uncompress.c */
272 /* Expand frame to image, possibly including decompression. Uses read_frame and fill_image */
273 extern int pwc_decompress(struct pwc_device *pdev);