1095 lines
27 KiB
C
1095 lines
27 KiB
C
/*
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* QuickCam Driver For Video4Linux.
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*
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* Video4Linux conversion work by Alan Cox.
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* Parport compatibility by Phil Blundell.
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* Busy loop avoidance by Mark Cooke.
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*
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* Module parameters:
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*
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* maxpoll=<1 - 5000>
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*
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* When polling the QuickCam for a response, busy-wait for a
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* maximum of this many loops. The default of 250 gives little
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* impact on interactive response.
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*
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* NOTE: If this parameter is set too high, the processor
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* will busy wait until this loop times out, and then
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* slowly poll for a further 5 seconds before failing
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* the transaction. You have been warned.
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*
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* yieldlines=<1 - 250>
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*
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* When acquiring a frame from the camera, the data gathering
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* loop will yield back to the scheduler after completing
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* this many lines. The default of 4 provides a trade-off
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* between increased frame acquisition time and impact on
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* interactive response.
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*/
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/* qcam-lib.c -- Library for programming with the Connectix QuickCam.
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* See the included documentation for usage instructions and details
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* of the protocol involved. */
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/* Version 0.5, August 4, 1996 */
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/* Version 0.7, August 27, 1996 */
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/* Version 0.9, November 17, 1996 */
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/******************************************************************
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Copyright (C) 1996 by Scott Laird
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL SCOTT LAIRD BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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******************************************************************/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/parport.h>
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#include <linux/sched.h>
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#include <linux/version.h>
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#include <linux/videodev2.h>
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#include <linux/mutex.h>
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#include <asm/uaccess.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-device.h>
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/* One from column A... */
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#define QC_NOTSET 0
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#define QC_UNIDIR 1
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#define QC_BIDIR 2
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#define QC_SERIAL 3
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/* ... and one from column B */
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#define QC_ANY 0x00
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#define QC_FORCE_UNIDIR 0x10
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#define QC_FORCE_BIDIR 0x20
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#define QC_FORCE_SERIAL 0x30
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/* in the port_mode member */
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#define QC_MODE_MASK 0x07
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#define QC_FORCE_MASK 0x70
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#define MAX_HEIGHT 243
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#define MAX_WIDTH 336
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/* Bit fields for status flags */
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#define QC_PARAM_CHANGE 0x01 /* Camera status change has occurred */
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struct qcam {
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struct v4l2_device v4l2_dev;
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struct video_device vdev;
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struct pardevice *pdev;
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struct parport *pport;
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struct mutex lock;
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int width, height;
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int bpp;
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int mode;
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int contrast, brightness, whitebal;
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int port_mode;
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int transfer_scale;
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int top, left;
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int status;
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unsigned int saved_bits;
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unsigned long in_use;
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};
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static unsigned int maxpoll = 250; /* Maximum busy-loop count for qcam I/O */
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static unsigned int yieldlines = 4; /* Yield after this many during capture */
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static int video_nr = -1;
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static unsigned int force_init; /* Whether to probe aggressively */
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module_param(maxpoll, int, 0);
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module_param(yieldlines, int, 0);
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module_param(video_nr, int, 0);
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/* Set force_init=1 to avoid detection by polling status register and
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* immediately attempt to initialize qcam */
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module_param(force_init, int, 0);
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#define MAX_CAMS 4
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static struct qcam *qcams[MAX_CAMS];
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static unsigned int num_cams;
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static inline int read_lpstatus(struct qcam *q)
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{
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return parport_read_status(q->pport);
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}
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static inline int read_lpdata(struct qcam *q)
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{
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return parport_read_data(q->pport);
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}
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static inline void write_lpdata(struct qcam *q, int d)
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{
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parport_write_data(q->pport, d);
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}
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static void write_lpcontrol(struct qcam *q, int d)
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{
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if (d & 0x20) {
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/* Set bidirectional mode to reverse (data in) */
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parport_data_reverse(q->pport);
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} else {
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/* Set bidirectional mode to forward (data out) */
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parport_data_forward(q->pport);
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}
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/* Now issue the regular port command, but strip out the
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* direction flag */
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d &= ~0x20;
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parport_write_control(q->pport, d);
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}
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/* qc_waithand busy-waits for a handshake signal from the QuickCam.
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* Almost all communication with the camera requires handshaking. */
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static int qc_waithand(struct qcam *q, int val)
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{
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int status;
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int runs = 0;
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if (val) {
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while (!((status = read_lpstatus(q)) & 8)) {
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/* 1000 is enough spins on the I/O for all normal
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cases, at that point we start to poll slowly
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until the camera wakes up. However, we are
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busy blocked until the camera responds, so
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setting it lower is much better for interactive
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response. */
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if (runs++ > maxpoll)
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msleep_interruptible(5);
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if (runs > (maxpoll + 1000)) /* 5 seconds */
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return -1;
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}
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} else {
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while (((status = read_lpstatus(q)) & 8)) {
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/* 1000 is enough spins on the I/O for all normal
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cases, at that point we start to poll slowly
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until the camera wakes up. However, we are
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busy blocked until the camera responds, so
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setting it lower is much better for interactive
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response. */
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if (runs++ > maxpoll)
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msleep_interruptible(5);
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if (runs++ > (maxpoll + 1000)) /* 5 seconds */
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return -1;
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}
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}
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return status;
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}
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/* Waithand2 is used when the qcam is in bidirectional mode, and the
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* handshaking signal is CamRdy2 (bit 0 of data reg) instead of CamRdy1
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* (bit 3 of status register). It also returns the last value read,
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* since this data is useful. */
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static unsigned int qc_waithand2(struct qcam *q, int val)
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{
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unsigned int status;
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int runs = 0;
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do {
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status = read_lpdata(q);
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/* 1000 is enough spins on the I/O for all normal
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cases, at that point we start to poll slowly
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until the camera wakes up. However, we are
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busy blocked until the camera responds, so
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setting it lower is much better for interactive
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response. */
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if (runs++ > maxpoll)
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msleep_interruptible(5);
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if (runs++ > (maxpoll + 1000)) /* 5 seconds */
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return 0;
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} while ((status & 1) != val);
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return status;
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}
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/* qc_command is probably a bit of a misnomer -- it's used to send
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* bytes *to* the camera. Generally, these bytes are either commands
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* or arguments to commands, so the name fits, but it still bugs me a
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* bit. See the documentation for a list of commands. */
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static int qc_command(struct qcam *q, int command)
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{
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int n1, n2;
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int cmd;
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write_lpdata(q, command);
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write_lpcontrol(q, 6);
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n1 = qc_waithand(q, 1);
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write_lpcontrol(q, 0xe);
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n2 = qc_waithand(q, 0);
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cmd = (n1 & 0xf0) | ((n2 & 0xf0) >> 4);
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return cmd;
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}
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static int qc_readparam(struct qcam *q)
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{
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int n1, n2;
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int cmd;
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write_lpcontrol(q, 6);
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n1 = qc_waithand(q, 1);
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write_lpcontrol(q, 0xe);
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n2 = qc_waithand(q, 0);
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cmd = (n1 & 0xf0) | ((n2 & 0xf0) >> 4);
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return cmd;
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}
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/* Try to detect a QuickCam. It appears to flash the upper 4 bits of
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the status register at 5-10 Hz. This is only used in the autoprobe
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code. Be aware that this isn't the way Connectix detects the
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camera (they send a reset and try to handshake), but this should be
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almost completely safe, while their method screws up my printer if
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I plug it in before the camera. */
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static int qc_detect(struct qcam *q)
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{
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int reg, lastreg;
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int count = 0;
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int i;
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if (force_init)
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return 1;
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lastreg = reg = read_lpstatus(q) & 0xf0;
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for (i = 0; i < 500; i++) {
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reg = read_lpstatus(q) & 0xf0;
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if (reg != lastreg)
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count++;
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lastreg = reg;
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mdelay(2);
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}
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#if 0
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/* Force camera detection during testing. Sometimes the camera
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won't be flashing these bits. Possibly unloading the module
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in the middle of a grab? Or some timeout condition?
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I've seen this parameter as low as 19 on my 450Mhz box - mpc */
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printk(KERN_DEBUG "Debugging: QCam detection counter <30-200 counts as detected>: %d\n", count);
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return 1;
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#endif
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/* Be (even more) liberal in what you accept... */
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if (count > 20 && count < 400) {
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return 1; /* found */
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} else {
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printk(KERN_ERR "No Quickcam found on port %s\n",
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q->pport->name);
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printk(KERN_DEBUG "Quickcam detection counter: %u\n", count);
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return 0; /* not found */
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}
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}
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/* Decide which scan mode to use. There's no real requirement that
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* the scanmode match the resolution in q->height and q-> width -- the
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* camera takes the picture at the resolution specified in the
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* "scanmode" and then returns the image at the resolution specified
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* with the resolution commands. If the scan is bigger than the
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* requested resolution, the upper-left hand corner of the scan is
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* returned. If the scan is smaller, then the rest of the image
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* returned contains garbage. */
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static int qc_setscanmode(struct qcam *q)
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{
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int old_mode = q->mode;
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switch (q->transfer_scale) {
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case 1:
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q->mode = 0;
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break;
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case 2:
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q->mode = 4;
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break;
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case 4:
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q->mode = 8;
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break;
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}
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switch (q->bpp) {
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case 4:
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break;
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case 6:
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q->mode += 2;
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break;
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}
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switch (q->port_mode & QC_MODE_MASK) {
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case QC_BIDIR:
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q->mode += 1;
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break;
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case QC_NOTSET:
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case QC_UNIDIR:
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break;
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}
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if (q->mode != old_mode)
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q->status |= QC_PARAM_CHANGE;
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return 0;
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}
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/* Reset the QuickCam. This uses the same sequence the Windows
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* QuickPic program uses. Someone with a bi-directional port should
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* check that bi-directional mode is detected right, and then
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* implement bi-directional mode in qc_readbyte(). */
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static void qc_reset(struct qcam *q)
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{
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switch (q->port_mode & QC_FORCE_MASK) {
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case QC_FORCE_UNIDIR:
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q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_UNIDIR;
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break;
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case QC_FORCE_BIDIR:
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q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_BIDIR;
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break;
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case QC_ANY:
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write_lpcontrol(q, 0x20);
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write_lpdata(q, 0x75);
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if (read_lpdata(q) != 0x75)
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q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_BIDIR;
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else
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q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_UNIDIR;
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break;
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}
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write_lpcontrol(q, 0xb);
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udelay(250);
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write_lpcontrol(q, 0xe);
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qc_setscanmode(q); /* in case port_mode changed */
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}
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/* Reset the QuickCam and program for brightness, contrast,
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* white-balance, and resolution. */
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static void qc_set(struct qcam *q)
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{
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int val;
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int val2;
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qc_reset(q);
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/* Set the brightness. Yes, this is repetitive, but it works.
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* Shorter versions seem to fail subtly. Feel free to try :-). */
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/* I think the problem was in qc_command, not here -- bls */
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qc_command(q, 0xb);
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qc_command(q, q->brightness);
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val = q->height / q->transfer_scale;
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qc_command(q, 0x11);
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qc_command(q, val);
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if ((q->port_mode & QC_MODE_MASK) == QC_UNIDIR && q->bpp == 6) {
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/* The normal "transfers per line" calculation doesn't seem to work
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as expected here (and yet it works fine in qc_scan). No idea
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why this case is the odd man out. Fortunately, Laird's original
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working version gives me a good way to guess at working values.
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-- bls */
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val = q->width;
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val2 = q->transfer_scale * 4;
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} else {
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val = q->width * q->bpp;
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val2 = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) *
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q->transfer_scale;
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}
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val = DIV_ROUND_UP(val, val2);
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qc_command(q, 0x13);
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qc_command(q, val);
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/* Setting top and left -- bls */
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qc_command(q, 0xd);
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qc_command(q, q->top);
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qc_command(q, 0xf);
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qc_command(q, q->left / 2);
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qc_command(q, 0x19);
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qc_command(q, q->contrast);
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qc_command(q, 0x1f);
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qc_command(q, q->whitebal);
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/* Clear flag that we must update the grabbing parameters on the camera
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before we grab the next frame */
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q->status &= (~QC_PARAM_CHANGE);
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}
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/* Qc_readbytes reads some bytes from the QC and puts them in
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the supplied buffer. It returns the number of bytes read,
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or -1 on error. */
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static inline int qc_readbytes(struct qcam *q, char buffer[])
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{
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int ret = 1;
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unsigned int hi, lo;
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unsigned int hi2, lo2;
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static int state;
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if (buffer == NULL) {
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state = 0;
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return 0;
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}
|
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|
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switch (q->port_mode & QC_MODE_MASK) {
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case QC_BIDIR: /* Bi-directional Port */
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write_lpcontrol(q, 0x26);
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lo = (qc_waithand2(q, 1) >> 1);
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hi = (read_lpstatus(q) >> 3) & 0x1f;
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write_lpcontrol(q, 0x2e);
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lo2 = (qc_waithand2(q, 0) >> 1);
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hi2 = (read_lpstatus(q) >> 3) & 0x1f;
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switch (q->bpp) {
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case 4:
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buffer[0] = lo & 0xf;
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buffer[1] = ((lo & 0x70) >> 4) | ((hi & 1) << 3);
|
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buffer[2] = (hi & 0x1e) >> 1;
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buffer[3] = lo2 & 0xf;
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buffer[4] = ((lo2 & 0x70) >> 4) | ((hi2 & 1) << 3);
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buffer[5] = (hi2 & 0x1e) >> 1;
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ret = 6;
|
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break;
|
|
case 6:
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buffer[0] = lo & 0x3f;
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buffer[1] = ((lo & 0x40) >> 6) | (hi << 1);
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buffer[2] = lo2 & 0x3f;
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buffer[3] = ((lo2 & 0x40) >> 6) | (hi2 << 1);
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ret = 4;
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break;
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}
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break;
|
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|
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case QC_UNIDIR: /* Unidirectional Port */
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write_lpcontrol(q, 6);
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lo = (qc_waithand(q, 1) & 0xf0) >> 4;
|
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write_lpcontrol(q, 0xe);
|
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hi = (qc_waithand(q, 0) & 0xf0) >> 4;
|
|
|
|
switch (q->bpp) {
|
|
case 4:
|
|
buffer[0] = lo;
|
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buffer[1] = hi;
|
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ret = 2;
|
|
break;
|
|
case 6:
|
|
switch (state) {
|
|
case 0:
|
|
buffer[0] = (lo << 2) | ((hi & 0xc) >> 2);
|
|
q->saved_bits = (hi & 3) << 4;
|
|
state = 1;
|
|
ret = 1;
|
|
break;
|
|
case 1:
|
|
buffer[0] = lo | q->saved_bits;
|
|
q->saved_bits = hi << 2;
|
|
state = 2;
|
|
ret = 1;
|
|
break;
|
|
case 2:
|
|
buffer[0] = ((lo & 0xc) >> 2) | q->saved_bits;
|
|
buffer[1] = ((lo & 3) << 4) | hi;
|
|
state = 0;
|
|
ret = 2;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* requests a scan from the camera. It sends the correct instructions
|
|
* to the camera and then reads back the correct number of bytes. In
|
|
* previous versions of this routine the return structure contained
|
|
* the raw output from the camera, and there was a 'qc_convertscan'
|
|
* function that converted that to a useful format. In version 0.3 I
|
|
* rolled qc_convertscan into qc_scan and now I only return the
|
|
* converted scan. The format is just an one-dimensional array of
|
|
* characters, one for each pixel, with 0=black up to n=white, where
|
|
* n=2^(bit depth)-1. Ask me for more details if you don't understand
|
|
* this. */
|
|
|
|
static long qc_capture(struct qcam *q, char __user *buf, unsigned long len)
|
|
{
|
|
int i, j, k, yield;
|
|
int bytes;
|
|
int linestotrans, transperline;
|
|
int divisor;
|
|
int pixels_per_line;
|
|
int pixels_read = 0;
|
|
int got = 0;
|
|
char buffer[6];
|
|
int shift = 8 - q->bpp;
|
|
char invert;
|
|
|
|
if (q->mode == -1)
|
|
return -ENXIO;
|
|
|
|
qc_command(q, 0x7);
|
|
qc_command(q, q->mode);
|
|
|
|
if ((q->port_mode & QC_MODE_MASK) == QC_BIDIR) {
|
|
write_lpcontrol(q, 0x2e); /* turn port around */
|
|
write_lpcontrol(q, 0x26);
|
|
qc_waithand(q, 1);
|
|
write_lpcontrol(q, 0x2e);
|
|
qc_waithand(q, 0);
|
|
}
|
|
|
|
/* strange -- should be 15:63 below, but 4bpp is odd */
|
|
invert = (q->bpp == 4) ? 16 : 63;
|
|
|
|
linestotrans = q->height / q->transfer_scale;
|
|
pixels_per_line = q->width / q->transfer_scale;
|
|
transperline = q->width * q->bpp;
|
|
divisor = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) *
|
|
q->transfer_scale;
|
|
transperline = DIV_ROUND_UP(transperline, divisor);
|
|
|
|
for (i = 0, yield = yieldlines; i < linestotrans; i++) {
|
|
for (pixels_read = j = 0; j < transperline; j++) {
|
|
bytes = qc_readbytes(q, buffer);
|
|
for (k = 0; k < bytes && (pixels_read + k) < pixels_per_line; k++) {
|
|
int o;
|
|
if (buffer[k] == 0 && invert == 16) {
|
|
/* 4bpp is odd (again) -- inverter is 16, not 15, but output
|
|
must be 0-15 -- bls */
|
|
buffer[k] = 16;
|
|
}
|
|
o = i * pixels_per_line + pixels_read + k;
|
|
if (o < len) {
|
|
got++;
|
|
put_user((invert - buffer[k]) << shift, buf + o);
|
|
}
|
|
}
|
|
pixels_read += bytes;
|
|
}
|
|
qc_readbytes(q, NULL); /* reset state machine */
|
|
|
|
/* Grabbing an entire frame from the quickcam is a lengthy
|
|
process. We don't (usually) want to busy-block the
|
|
processor for the entire frame. yieldlines is a module
|
|
parameter. If we yield every line, the minimum frame
|
|
time will be 240 / 200 = 1.2 seconds. The compile-time
|
|
default is to yield every 4 lines. */
|
|
if (i >= yield) {
|
|
msleep_interruptible(5);
|
|
yield = i + yieldlines;
|
|
}
|
|
}
|
|
|
|
if ((q->port_mode & QC_MODE_MASK) == QC_BIDIR) {
|
|
write_lpcontrol(q, 2);
|
|
write_lpcontrol(q, 6);
|
|
udelay(3);
|
|
write_lpcontrol(q, 0xe);
|
|
}
|
|
if (got < len)
|
|
return got;
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* Video4linux interfacing
|
|
*/
|
|
|
|
static int qcam_querycap(struct file *file, void *priv,
|
|
struct v4l2_capability *vcap)
|
|
{
|
|
struct qcam *qcam = video_drvdata(file);
|
|
|
|
strlcpy(vcap->driver, qcam->v4l2_dev.name, sizeof(vcap->driver));
|
|
strlcpy(vcap->card, "B&W Quickcam", sizeof(vcap->card));
|
|
strlcpy(vcap->bus_info, "parport", sizeof(vcap->bus_info));
|
|
vcap->version = KERNEL_VERSION(0, 0, 2);
|
|
vcap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE;
|
|
return 0;
|
|
}
|
|
|
|
static int qcam_enum_input(struct file *file, void *fh, struct v4l2_input *vin)
|
|
{
|
|
if (vin->index > 0)
|
|
return -EINVAL;
|
|
strlcpy(vin->name, "Camera", sizeof(vin->name));
|
|
vin->type = V4L2_INPUT_TYPE_CAMERA;
|
|
vin->audioset = 0;
|
|
vin->tuner = 0;
|
|
vin->std = 0;
|
|
vin->status = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int qcam_g_input(struct file *file, void *fh, unsigned int *inp)
|
|
{
|
|
*inp = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int qcam_s_input(struct file *file, void *fh, unsigned int inp)
|
|
{
|
|
return (inp > 0) ? -EINVAL : 0;
|
|
}
|
|
|
|
static int qcam_queryctrl(struct file *file, void *priv,
|
|
struct v4l2_queryctrl *qc)
|
|
{
|
|
switch (qc->id) {
|
|
case V4L2_CID_BRIGHTNESS:
|
|
return v4l2_ctrl_query_fill(qc, 0, 255, 1, 180);
|
|
case V4L2_CID_CONTRAST:
|
|
return v4l2_ctrl_query_fill(qc, 0, 255, 1, 192);
|
|
case V4L2_CID_GAMMA:
|
|
return v4l2_ctrl_query_fill(qc, 0, 255, 1, 105);
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int qcam_g_ctrl(struct file *file, void *priv,
|
|
struct v4l2_control *ctrl)
|
|
{
|
|
struct qcam *qcam = video_drvdata(file);
|
|
int ret = 0;
|
|
|
|
switch (ctrl->id) {
|
|
case V4L2_CID_BRIGHTNESS:
|
|
ctrl->value = qcam->brightness;
|
|
break;
|
|
case V4L2_CID_CONTRAST:
|
|
ctrl->value = qcam->contrast;
|
|
break;
|
|
case V4L2_CID_GAMMA:
|
|
ctrl->value = qcam->whitebal;
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int qcam_s_ctrl(struct file *file, void *priv,
|
|
struct v4l2_control *ctrl)
|
|
{
|
|
struct qcam *qcam = video_drvdata(file);
|
|
int ret = 0;
|
|
|
|
mutex_lock(&qcam->lock);
|
|
switch (ctrl->id) {
|
|
case V4L2_CID_BRIGHTNESS:
|
|
qcam->brightness = ctrl->value;
|
|
break;
|
|
case V4L2_CID_CONTRAST:
|
|
qcam->contrast = ctrl->value;
|
|
break;
|
|
case V4L2_CID_GAMMA:
|
|
qcam->whitebal = ctrl->value;
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (ret == 0) {
|
|
qc_setscanmode(qcam);
|
|
qcam->status |= QC_PARAM_CHANGE;
|
|
}
|
|
mutex_unlock(&qcam->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int qcam_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
|
|
{
|
|
struct qcam *qcam = video_drvdata(file);
|
|
struct v4l2_pix_format *pix = &fmt->fmt.pix;
|
|
|
|
pix->width = qcam->width / qcam->transfer_scale;
|
|
pix->height = qcam->height / qcam->transfer_scale;
|
|
pix->pixelformat = (qcam->bpp == 4) ? V4L2_PIX_FMT_Y4 : V4L2_PIX_FMT_Y6;
|
|
pix->field = V4L2_FIELD_NONE;
|
|
pix->bytesperline = qcam->width;
|
|
pix->sizeimage = qcam->width * qcam->height;
|
|
/* Just a guess */
|
|
pix->colorspace = V4L2_COLORSPACE_SRGB;
|
|
return 0;
|
|
}
|
|
|
|
static int qcam_try_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
|
|
{
|
|
struct v4l2_pix_format *pix = &fmt->fmt.pix;
|
|
|
|
if (pix->height <= 60 || pix->width <= 80) {
|
|
pix->height = 60;
|
|
pix->width = 80;
|
|
} else if (pix->height <= 120 || pix->width <= 160) {
|
|
pix->height = 120;
|
|
pix->width = 160;
|
|
} else {
|
|
pix->height = 240;
|
|
pix->width = 320;
|
|
}
|
|
if (pix->pixelformat != V4L2_PIX_FMT_Y4 &&
|
|
pix->pixelformat != V4L2_PIX_FMT_Y6)
|
|
pix->pixelformat = V4L2_PIX_FMT_Y4;
|
|
pix->field = V4L2_FIELD_NONE;
|
|
pix->bytesperline = pix->width;
|
|
pix->sizeimage = pix->width * pix->height;
|
|
/* Just a guess */
|
|
pix->colorspace = V4L2_COLORSPACE_SRGB;
|
|
return 0;
|
|
}
|
|
|
|
static int qcam_s_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
|
|
{
|
|
struct qcam *qcam = video_drvdata(file);
|
|
struct v4l2_pix_format *pix = &fmt->fmt.pix;
|
|
int ret = qcam_try_fmt_vid_cap(file, fh, fmt);
|
|
|
|
if (ret)
|
|
return ret;
|
|
qcam->width = 320;
|
|
qcam->height = 240;
|
|
if (pix->height == 60)
|
|
qcam->transfer_scale = 4;
|
|
else if (pix->height == 120)
|
|
qcam->transfer_scale = 2;
|
|
else
|
|
qcam->transfer_scale = 1;
|
|
if (pix->pixelformat == V4L2_PIX_FMT_Y6)
|
|
qcam->bpp = 6;
|
|
else
|
|
qcam->bpp = 4;
|
|
|
|
mutex_lock(&qcam->lock);
|
|
qc_setscanmode(qcam);
|
|
/* We must update the camera before we grab. We could
|
|
just have changed the grab size */
|
|
qcam->status |= QC_PARAM_CHANGE;
|
|
mutex_unlock(&qcam->lock);
|
|
return 0;
|
|
}
|
|
|
|
static int qcam_enum_fmt_vid_cap(struct file *file, void *fh, struct v4l2_fmtdesc *fmt)
|
|
{
|
|
static struct v4l2_fmtdesc formats[] = {
|
|
{ 0, 0, 0,
|
|
"4-Bit Monochrome", V4L2_PIX_FMT_Y4,
|
|
{ 0, 0, 0, 0 }
|
|
},
|
|
{ 0, 0, 0,
|
|
"6-Bit Monochrome", V4L2_PIX_FMT_Y6,
|
|
{ 0, 0, 0, 0 }
|
|
},
|
|
};
|
|
enum v4l2_buf_type type = fmt->type;
|
|
|
|
if (fmt->index > 1)
|
|
return -EINVAL;
|
|
|
|
*fmt = formats[fmt->index];
|
|
fmt->type = type;
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t qcam_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct qcam *qcam = video_drvdata(file);
|
|
int len;
|
|
parport_claim_or_block(qcam->pdev);
|
|
|
|
mutex_lock(&qcam->lock);
|
|
|
|
qc_reset(qcam);
|
|
|
|
/* Update the camera parameters if we need to */
|
|
if (qcam->status & QC_PARAM_CHANGE)
|
|
qc_set(qcam);
|
|
|
|
len = qc_capture(qcam, buf, count);
|
|
|
|
mutex_unlock(&qcam->lock);
|
|
|
|
parport_release(qcam->pdev);
|
|
return len;
|
|
}
|
|
|
|
static const struct v4l2_file_operations qcam_fops = {
|
|
.owner = THIS_MODULE,
|
|
.unlocked_ioctl = video_ioctl2,
|
|
.read = qcam_read,
|
|
};
|
|
|
|
static const struct v4l2_ioctl_ops qcam_ioctl_ops = {
|
|
.vidioc_querycap = qcam_querycap,
|
|
.vidioc_g_input = qcam_g_input,
|
|
.vidioc_s_input = qcam_s_input,
|
|
.vidioc_enum_input = qcam_enum_input,
|
|
.vidioc_queryctrl = qcam_queryctrl,
|
|
.vidioc_g_ctrl = qcam_g_ctrl,
|
|
.vidioc_s_ctrl = qcam_s_ctrl,
|
|
.vidioc_enum_fmt_vid_cap = qcam_enum_fmt_vid_cap,
|
|
.vidioc_g_fmt_vid_cap = qcam_g_fmt_vid_cap,
|
|
.vidioc_s_fmt_vid_cap = qcam_s_fmt_vid_cap,
|
|
.vidioc_try_fmt_vid_cap = qcam_try_fmt_vid_cap,
|
|
};
|
|
|
|
/* Initialize the QuickCam driver control structure. This is where
|
|
* defaults are set for people who don't have a config file.*/
|
|
|
|
static struct qcam *qcam_init(struct parport *port)
|
|
{
|
|
struct qcam *qcam;
|
|
struct v4l2_device *v4l2_dev;
|
|
|
|
qcam = kzalloc(sizeof(struct qcam), GFP_KERNEL);
|
|
if (qcam == NULL)
|
|
return NULL;
|
|
|
|
v4l2_dev = &qcam->v4l2_dev;
|
|
strlcpy(v4l2_dev->name, "bw-qcam", sizeof(v4l2_dev->name));
|
|
|
|
if (v4l2_device_register(NULL, v4l2_dev) < 0) {
|
|
v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
|
|
return NULL;
|
|
}
|
|
|
|
qcam->pport = port;
|
|
qcam->pdev = parport_register_device(port, "bw-qcam", NULL, NULL,
|
|
NULL, 0, NULL);
|
|
if (qcam->pdev == NULL) {
|
|
v4l2_err(v4l2_dev, "couldn't register for %s.\n", port->name);
|
|
kfree(qcam);
|
|
return NULL;
|
|
}
|
|
|
|
strlcpy(qcam->vdev.name, "Connectix QuickCam", sizeof(qcam->vdev.name));
|
|
qcam->vdev.v4l2_dev = v4l2_dev;
|
|
qcam->vdev.fops = &qcam_fops;
|
|
qcam->vdev.ioctl_ops = &qcam_ioctl_ops;
|
|
qcam->vdev.release = video_device_release_empty;
|
|
video_set_drvdata(&qcam->vdev, qcam);
|
|
|
|
mutex_init(&qcam->lock);
|
|
|
|
qcam->port_mode = (QC_ANY | QC_NOTSET);
|
|
qcam->width = 320;
|
|
qcam->height = 240;
|
|
qcam->bpp = 4;
|
|
qcam->transfer_scale = 2;
|
|
qcam->contrast = 192;
|
|
qcam->brightness = 180;
|
|
qcam->whitebal = 105;
|
|
qcam->top = 1;
|
|
qcam->left = 14;
|
|
qcam->mode = -1;
|
|
qcam->status = QC_PARAM_CHANGE;
|
|
return qcam;
|
|
}
|
|
|
|
static int qc_calibrate(struct qcam *q)
|
|
{
|
|
/*
|
|
* Bugfix by Hanno Mueller hmueller@kabel.de, Mai 21 96
|
|
* The white balance is an individual value for each
|
|
* quickcam.
|
|
*/
|
|
|
|
int value;
|
|
int count = 0;
|
|
|
|
qc_command(q, 27); /* AutoAdjustOffset */
|
|
qc_command(q, 0); /* Dummy Parameter, ignored by the camera */
|
|
|
|
/* GetOffset (33) will read 255 until autocalibration */
|
|
/* is finished. After that, a value of 1-254 will be */
|
|
/* returned. */
|
|
|
|
do {
|
|
qc_command(q, 33);
|
|
value = qc_readparam(q);
|
|
mdelay(1);
|
|
schedule();
|
|
count++;
|
|
} while (value == 0xff && count < 2048);
|
|
|
|
q->whitebal = value;
|
|
return value;
|
|
}
|
|
|
|
static int init_bwqcam(struct parport *port)
|
|
{
|
|
struct qcam *qcam;
|
|
|
|
if (num_cams == MAX_CAMS) {
|
|
printk(KERN_ERR "Too many Quickcams (max %d)\n", MAX_CAMS);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
qcam = qcam_init(port);
|
|
if (qcam == NULL)
|
|
return -ENODEV;
|
|
|
|
parport_claim_or_block(qcam->pdev);
|
|
|
|
qc_reset(qcam);
|
|
|
|
if (qc_detect(qcam) == 0) {
|
|
parport_release(qcam->pdev);
|
|
parport_unregister_device(qcam->pdev);
|
|
kfree(qcam);
|
|
return -ENODEV;
|
|
}
|
|
qc_calibrate(qcam);
|
|
|
|
parport_release(qcam->pdev);
|
|
|
|
v4l2_info(&qcam->v4l2_dev, "Connectix Quickcam on %s\n", qcam->pport->name);
|
|
|
|
if (video_register_device(&qcam->vdev, VFL_TYPE_GRABBER, video_nr) < 0) {
|
|
parport_unregister_device(qcam->pdev);
|
|
kfree(qcam);
|
|
return -ENODEV;
|
|
}
|
|
|
|
qcams[num_cams++] = qcam;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void close_bwqcam(struct qcam *qcam)
|
|
{
|
|
video_unregister_device(&qcam->vdev);
|
|
parport_unregister_device(qcam->pdev);
|
|
kfree(qcam);
|
|
}
|
|
|
|
/* The parport parameter controls which parports will be scanned.
|
|
* Scanning all parports causes some printers to print a garbage page.
|
|
* -- March 14, 1999 Billy Donahue <billy@escape.com> */
|
|
#ifdef MODULE
|
|
static char *parport[MAX_CAMS] = { NULL, };
|
|
module_param_array(parport, charp, NULL, 0);
|
|
#endif
|
|
|
|
static int accept_bwqcam(struct parport *port)
|
|
{
|
|
#ifdef MODULE
|
|
int n;
|
|
|
|
if (parport[0] && strncmp(parport[0], "auto", 4) != 0) {
|
|
/* user gave parport parameters */
|
|
for (n = 0; n < MAX_CAMS && parport[n]; n++) {
|
|
char *ep;
|
|
unsigned long r;
|
|
r = simple_strtoul(parport[n], &ep, 0);
|
|
if (ep == parport[n]) {
|
|
printk(KERN_ERR
|
|
"bw-qcam: bad port specifier \"%s\"\n",
|
|
parport[n]);
|
|
continue;
|
|
}
|
|
if (r == port->number)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
return 1;
|
|
}
|
|
|
|
static void bwqcam_attach(struct parport *port)
|
|
{
|
|
if (accept_bwqcam(port))
|
|
init_bwqcam(port);
|
|
}
|
|
|
|
static void bwqcam_detach(struct parport *port)
|
|
{
|
|
int i;
|
|
for (i = 0; i < num_cams; i++) {
|
|
struct qcam *qcam = qcams[i];
|
|
if (qcam && qcam->pdev->port == port) {
|
|
qcams[i] = NULL;
|
|
close_bwqcam(qcam);
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct parport_driver bwqcam_driver = {
|
|
.name = "bw-qcam",
|
|
.attach = bwqcam_attach,
|
|
.detach = bwqcam_detach,
|
|
};
|
|
|
|
static void __exit exit_bw_qcams(void)
|
|
{
|
|
parport_unregister_driver(&bwqcam_driver);
|
|
}
|
|
|
|
static int __init init_bw_qcams(void)
|
|
{
|
|
#ifdef MODULE
|
|
/* Do some sanity checks on the module parameters. */
|
|
if (maxpoll > 5000) {
|
|
printk(KERN_INFO "Connectix Quickcam max-poll was above 5000. Using 5000.\n");
|
|
maxpoll = 5000;
|
|
}
|
|
|
|
if (yieldlines < 1) {
|
|
printk(KERN_INFO "Connectix Quickcam yieldlines was less than 1. Using 1.\n");
|
|
yieldlines = 1;
|
|
}
|
|
#endif
|
|
return parport_register_driver(&bwqcam_driver);
|
|
}
|
|
|
|
module_init(init_bw_qcams);
|
|
module_exit(exit_bw_qcams);
|
|
|
|
MODULE_LICENSE("GPL");
|