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/config.h>
22 #include <linux/module.h>
23 #include <linux/usb.h>
24 #include <linux/spinlock.h>
25 #include <linux/videodev.h>
26 #include <linux/wait.h>
27 #include <linux/smp_lock.h>
29 #include <asm/semaphore.h>
30 #include <asm/errno.h>
32 /* Defines and structures for the Philips webcam */
33 /* Used for checking memory corruption/pointer validation */
34 #define PWC_MAGIC 0x89DC10ABUL
37 /* Turn some debugging options on/off */
40 /* Trace certain actions in the driver */
41 #define TRACE_MODULE 0x0001
42 #define TRACE_PROBE 0x0002
43 #define TRACE_OPEN 0x0004
44 #define TRACE_READ 0x0008
45 #define TRACE_MEMORY 0x0010
46 #define TRACE_FLOW 0x0020
47 #define TRACE_SIZE 0x0040
48 #define TRACE_PWCX 0x0080
49 #define TRACE_SEQUENCE 0x1000
51 #define Trace(R, A...) if (pwc_trace & R) printk(KERN_DEBUG PWC_NAME " " A)
52 #define Debug(A...) printk(KERN_DEBUG PWC_NAME " " A)
53 #define Info(A...) printk(KERN_INFO PWC_NAME " " A)
54 #define Err(A...) printk(KERN_ERR PWC_NAME " " A)
57 /* Defines for ToUCam cameras */
58 #define TOUCAM_HEADER_SIZE 8
59 #define TOUCAM_TRAILER_SIZE 4
64 #define PWC_VERSION "8.11"
65 #define PWC_NAME "pwc"
67 /* Turn certain features on/off */
68 #define PWC_INT_PIPE 0
70 /* Ignore errors in the first N frames, to allow for startup delays */
71 #define FRAME_LOWMARK 5
73 /* Size and number of buffers for the ISO pipe. */
74 #define MAX_ISO_BUFS 2
75 #define ISO_FRAMES_PER_DESC 10
76 #define ISO_MAX_FRAME_SIZE 960
77 #define ISO_BUFFER_SIZE (ISO_FRAMES_PER_DESC * ISO_MAX_FRAME_SIZE)
79 /* Frame buffers: contains compressed or uncompressed video data. */
81 /* Maximum size after decompression is 640x480 YUV data, 1.5 * 640 * 480 */
82 #define PWC_FRAME_SIZE (460800 + TOUCAM_HEADER_SIZE + TOUCAM_TRAILER_SIZE)
84 /* Absolute maximum number of buffers available for mmap() */
89 int x, y; /* guess what */
90 int size; /* size, or offset */
93 /* The following structures were based on cpia.h. Why reinvent the wheel? :-) */
102 /* intermediate buffers with raw data from the USB cam */
106 volatile int filled; /* number of bytes filled */
107 struct pwc_frame_buf *next; /* list */
109 int sequence; /* Sequence number */
115 struct video_device vdev;
119 /* Pointer to our usb_device */
120 struct usb_device *udev;
122 int type; /* type of cam (645, 646, 675, 680, 690) */
123 int release; /* release number */
124 int error_status; /* set when something goes wrong with the cam (unplugged, USB errors) */
125 int usb_init; /* set when the cam has been initialized over USB */
128 int vopen; /* flag */
129 int vendpoint; /* video isoc endpoint */
130 int vcinterface; /* video control interface */
131 int valternate; /* alternate interface needed */
132 int vframes, vsize; /* frames-per-second & size (see PSZ_*) */
133 int vframe_count; /* received frames */
134 int vframes_dumped; /* counter for dumped frames */
135 int vframes_error; /* frames received in error */
136 int vmax_packet_size; /* USB maxpacket size */
137 int vlast_packet_size; /* for frame synchronisation */
138 int visoc_errors; /* number of contiguous ISOC errors */
139 int vcompression; /* desired compression factor */
140 int vbandlength; /* compressed band length; 0 is uncompressed */
141 char vsnapshot; /* snapshot mode */
142 char vsync; /* used by isoc handler */
143 char vmirror; /* for ToUCaM series */
145 /* The image acquisition requires 3 to 4 steps:
146 1. data is gathered in short packets from the USB controller
147 2. data is synchronized and packed into a frame buffer
148 3a. in case data is compressed, decompress it directly into image buffer
149 3b. in case data is uncompressed, copy into image buffer with viewport
150 4. data is transferred to the user process
152 Note that MAX_ISO_BUFS != MAX_FRAMES != MAX_IMAGES....
153 We have in effect a back-to-back-double-buffer system.
156 struct pwc_iso_buf sbuf[MAX_ISO_BUFS];
160 struct pwc_frame_buf *fbuf; /* all frames */
161 struct pwc_frame_buf *empty_frames, *empty_frames_tail; /* all empty frames */
162 struct pwc_frame_buf *full_frames, *full_frames_tail; /* all filled frames */
163 struct pwc_frame_buf *fill_frame; /* frame currently being filled */
164 struct pwc_frame_buf *read_frame; /* frame currently read by user process */
166 int frame_header_size, frame_trailer_size;
169 int sequence; /* Debugging aid */
172 /* 3: decompression */
173 struct pwc_decompressor *decompressor; /* function block with decompression routines */
174 void *decompress_data; /* private data for decompression engine */
177 /* We have an 'image' and a 'view', where 'image' is the fixed-size image
178 as delivered by the camera, and 'view' is the size requested by the
179 program. The camera image is centered in this viewport, laced with
180 a gray or black border. view_min <= image <= view <= view_max;
182 int image_mask; /* bitmask of supported sizes */
183 struct pwc_coord view_min, view_max; /* minimum and maximum sizes */
184 struct pwc_coord image, view; /* image and viewport size */
185 struct pwc_coord offset; /* offset within the viewport */
187 void *image_data; /* total buffer, which is subdivided into ... */
188 void *image_ptr[MAX_IMAGES]; /* ...several images... */
189 int fill_image; /* ...which are rotated. */
190 int len_per_image; /* length per image */
191 int image_read_pos; /* In case we read data in pieces, keep track of were we are in the imagebuffer */
192 int image_used[MAX_IMAGES]; /* For MCAPTURE and SYNC */
194 struct semaphore modlock; /* to prevent races in video_open(), etc */
195 spinlock_t ptrlock; /* for manipulating the buffer pointers */
198 wait_queue_head_t frameq; /* When waiting for a frame to finish... */
200 void *usb_int_handler; /* for the interrupt endpoint */
204 /* Enumeration of image sizes */
205 #define PSZ_SQCIF 0x00
206 #define PSZ_QSIF 0x01
207 #define PSZ_QCIF 0x02
219 /* Global variables */
220 extern int pwc_trace;
221 extern int pwc_preferred_compression;
223 /** functions in pwc-if.c */
224 int pwc_try_video_mode(struct pwc_device *pdev, int width, int height, int new_fps, int new_compression, int new_snapshot);
226 /** Functions in pwc-misc.c */
227 /* sizes in pixels */
228 extern struct pwc_coord pwc_image_sizes[PSZ_MAX];
230 int pwc_decode_size(struct pwc_device *pdev, int width, int height);
231 void pwc_construct(struct pwc_device *pdev);
233 /** Functions in pwc-ctrl.c */
234 /* Request a certain video mode. Returns < 0 if not possible */
235 extern int pwc_set_video_mode(struct pwc_device *pdev, int width, int height, int frames, int compression, int snapshot);
236 /* Calculate the number of bytes per image (not frame) */
237 extern void pwc_set_image_buffer_size(struct pwc_device *pdev);
239 /* Various controls; should be obvious. Value 0..65535, or < 0 on error */
240 extern int pwc_get_brightness(struct pwc_device *pdev);
241 extern int pwc_set_brightness(struct pwc_device *pdev, int value);
242 extern int pwc_get_contrast(struct pwc_device *pdev);
243 extern int pwc_set_contrast(struct pwc_device *pdev, int value);
244 extern int pwc_get_gamma(struct pwc_device *pdev);
245 extern int pwc_set_gamma(struct pwc_device *pdev, int value);
246 extern int pwc_get_saturation(struct pwc_device *pdev);
247 extern int pwc_set_saturation(struct pwc_device *pdev, int value);
248 extern int pwc_set_leds(struct pwc_device *pdev, int on_value, int off_value);
249 extern int pwc_get_leds(struct pwc_device *pdev, int *on_value, int *off_value);
250 extern int pwc_get_cmos_sensor(struct pwc_device *pdev);
252 /* Power down or up the camera; not supported by all models */
253 extern int pwc_camera_power(struct pwc_device *pdev, int power);
255 /* Private ioctl()s; see pwc-ioctl.h */
256 extern int pwc_ioctl(struct pwc_device *pdev, unsigned int cmd, void *arg);
259 /** pwc-uncompress.c */
260 /* Expand frame to image, possibly including decompression. Uses read_frame and fill_image */
261 extern int pwc_decompress(struct pwc_device *pdev);