1064 lines
25 KiB
C
1064 lines
25 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/init.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/videodev.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-ioctl.h>
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#include <linux/mutex.h>
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#include <asm/uaccess.h>
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#include "bw-qcam.h"
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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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static inline int read_lpstatus(struct qcam_device *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_device *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_device *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 inline void write_lpcontrol(struct qcam_device *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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static int qc_waithand(struct qcam_device *q, int val);
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static int qc_command(struct qcam_device *q, int command);
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static int qc_readparam(struct qcam_device *q);
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static int qc_setscanmode(struct qcam_device *q);
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static int qc_readbytes(struct qcam_device *q, char buffer[]);
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static struct video_device qcam_template;
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static int qc_calibrate(struct qcam_device *q)
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{
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/*
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* Bugfix by Hanno Mueller hmueller@kabel.de, Mai 21 96
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* The white balance is an individiual value for each
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* quickcam.
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*/
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int value;
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int count = 0;
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qc_command(q, 27); /* AutoAdjustOffset */
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qc_command(q, 0); /* Dummy Parameter, ignored by the camera */
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/* GetOffset (33) will read 255 until autocalibration */
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/* is finished. After that, a value of 1-254 will be */
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/* returned. */
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do {
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qc_command(q, 33);
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value = qc_readparam(q);
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mdelay(1);
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schedule();
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count++;
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} while (value == 0xff && count<2048);
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q->whitebal = value;
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return value;
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}
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/* Initialize the QuickCam driver control structure. This is where
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* defaults are set for people who don't have a config file.*/
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static struct qcam_device *qcam_init(struct parport *port)
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{
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struct qcam_device *q;
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q = kmalloc(sizeof(struct qcam_device), GFP_KERNEL);
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if(q==NULL)
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return NULL;
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q->pport = port;
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q->pdev = parport_register_device(port, "bw-qcam", NULL, NULL,
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NULL, 0, NULL);
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if (q->pdev == NULL)
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{
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printk(KERN_ERR "bw-qcam: couldn't register for %s.\n",
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port->name);
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kfree(q);
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return NULL;
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}
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memcpy(&q->vdev, &qcam_template, sizeof(qcam_template));
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mutex_init(&q->lock);
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q->port_mode = (QC_ANY | QC_NOTSET);
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q->width = 320;
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q->height = 240;
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q->bpp = 4;
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q->transfer_scale = 2;
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q->contrast = 192;
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q->brightness = 180;
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q->whitebal = 105;
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q->top = 1;
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q->left = 14;
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q->mode = -1;
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q->status = QC_PARAM_CHANGE;
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return q;
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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_device *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_device *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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/* 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_device *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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{
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while (!((status = read_lpstatus(q)) & 8))
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{
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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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{
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msleep_interruptible(5);
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}
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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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else
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{
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while (((status = read_lpstatus(q)) & 8))
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{
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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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{
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msleep_interruptible(5);
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}
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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_device *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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{
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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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{
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msleep_interruptible(5);
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}
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if(runs++>(maxpoll+1000)) /* 5 seconds */
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return 0;
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}
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while ((status & 1) != val);
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return status;
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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_device *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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{
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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("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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/* 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_device *q)
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{
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switch (q->port_mode & QC_FORCE_MASK)
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{
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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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}
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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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/* 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_device *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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{
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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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{
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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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{
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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 and program for brightness, contrast,
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* white-balance, and resolution. */
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static void qc_set(struct qcam_device *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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|
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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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|
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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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|
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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,
|
|
or -1 on error. */
|
|
|
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static inline int qc_readbytes(struct qcam_device *q, char buffer[])
|
|
{
|
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int ret=1;
|
|
unsigned int hi, lo;
|
|
unsigned int hi2, lo2;
|
|
static int state;
|
|
|
|
if (buffer == NULL)
|
|
{
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state = 0;
|
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return 0;
|
|
}
|
|
|
|
switch (q->port_mode & QC_MODE_MASK)
|
|
{
|
|
case QC_BIDIR: /* Bi-directional Port */
|
|
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);
|
|
lo2 = (qc_waithand2(q, 0) >> 1);
|
|
hi2 = (read_lpstatus(q) >> 3) & 0x1f;
|
|
switch (q->bpp)
|
|
{
|
|
case 4:
|
|
buffer[0] = lo & 0xf;
|
|
buffer[1] = ((lo & 0x70) >> 4) | ((hi & 1) << 3);
|
|
buffer[2] = (hi & 0x1e) >> 1;
|
|
buffer[3] = lo2 & 0xf;
|
|
buffer[4] = ((lo2 & 0x70) >> 4) | ((hi2 & 1) << 3);
|
|
buffer[5] = (hi2 & 0x1e) >> 1;
|
|
ret = 6;
|
|
break;
|
|
case 6:
|
|
buffer[0] = lo & 0x3f;
|
|
buffer[1] = ((lo & 0x40) >> 6) | (hi << 1);
|
|
buffer[2] = lo2 & 0x3f;
|
|
buffer[3] = ((lo2 & 0x40) >> 6) | (hi2 << 1);
|
|
ret = 4;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case QC_UNIDIR: /* Unidirectional Port */
|
|
write_lpcontrol(q, 6);
|
|
lo = (qc_waithand(q, 1) & 0xf0) >> 4;
|
|
write_lpcontrol(q, 0xe);
|
|
hi = (qc_waithand(q, 0) & 0xf0) >> 4;
|
|
|
|
switch (q->bpp)
|
|
{
|
|
case 4:
|
|
buffer[0] = lo;
|
|
buffer[1] = hi;
|
|
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_device * 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);
|
|
(void) qc_waithand(q, 1);
|
|
write_lpcontrol(q, 0x2e);
|
|
(void) 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;
|
|
}
|
|
(void) 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 long qcam_do_ioctl(struct file *file, unsigned int cmd, void *arg)
|
|
{
|
|
struct video_device *dev = video_devdata(file);
|
|
struct qcam_device *qcam=(struct qcam_device *)dev;
|
|
|
|
switch(cmd)
|
|
{
|
|
case VIDIOCGCAP:
|
|
{
|
|
struct video_capability *b = arg;
|
|
strcpy(b->name, "Quickcam");
|
|
b->type = VID_TYPE_CAPTURE|VID_TYPE_SCALES|VID_TYPE_MONOCHROME;
|
|
b->channels = 1;
|
|
b->audios = 0;
|
|
b->maxwidth = 320;
|
|
b->maxheight = 240;
|
|
b->minwidth = 80;
|
|
b->minheight = 60;
|
|
return 0;
|
|
}
|
|
case VIDIOCGCHAN:
|
|
{
|
|
struct video_channel *v = arg;
|
|
if(v->channel!=0)
|
|
return -EINVAL;
|
|
v->flags=0;
|
|
v->tuners=0;
|
|
/* Good question.. its composite or SVHS so.. */
|
|
v->type = VIDEO_TYPE_CAMERA;
|
|
strcpy(v->name, "Camera");
|
|
return 0;
|
|
}
|
|
case VIDIOCSCHAN:
|
|
{
|
|
struct video_channel *v = arg;
|
|
if(v->channel!=0)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
case VIDIOCGTUNER:
|
|
{
|
|
struct video_tuner *v = arg;
|
|
if(v->tuner)
|
|
return -EINVAL;
|
|
strcpy(v->name, "Format");
|
|
v->rangelow=0;
|
|
v->rangehigh=0;
|
|
v->flags= 0;
|
|
v->mode = VIDEO_MODE_AUTO;
|
|
return 0;
|
|
}
|
|
case VIDIOCSTUNER:
|
|
{
|
|
struct video_tuner *v = arg;
|
|
if(v->tuner)
|
|
return -EINVAL;
|
|
if(v->mode!=VIDEO_MODE_AUTO)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
case VIDIOCGPICT:
|
|
{
|
|
struct video_picture *p = arg;
|
|
p->colour=0x8000;
|
|
p->hue=0x8000;
|
|
p->brightness=qcam->brightness<<8;
|
|
p->contrast=qcam->contrast<<8;
|
|
p->whiteness=qcam->whitebal<<8;
|
|
p->depth=qcam->bpp;
|
|
p->palette=VIDEO_PALETTE_GREY;
|
|
return 0;
|
|
}
|
|
case VIDIOCSPICT:
|
|
{
|
|
struct video_picture *p = arg;
|
|
if(p->palette!=VIDEO_PALETTE_GREY)
|
|
return -EINVAL;
|
|
if(p->depth!=4 && p->depth!=6)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Now load the camera.
|
|
*/
|
|
|
|
qcam->brightness = p->brightness>>8;
|
|
qcam->contrast = p->contrast>>8;
|
|
qcam->whitebal = p->whiteness>>8;
|
|
qcam->bpp = p->depth;
|
|
|
|
mutex_lock(&qcam->lock);
|
|
qc_setscanmode(qcam);
|
|
mutex_unlock(&qcam->lock);
|
|
qcam->status |= QC_PARAM_CHANGE;
|
|
|
|
return 0;
|
|
}
|
|
case VIDIOCSWIN:
|
|
{
|
|
struct video_window *vw = arg;
|
|
if(vw->flags)
|
|
return -EINVAL;
|
|
if(vw->clipcount)
|
|
return -EINVAL;
|
|
if(vw->height<60||vw->height>240)
|
|
return -EINVAL;
|
|
if(vw->width<80||vw->width>320)
|
|
return -EINVAL;
|
|
|
|
qcam->width = 320;
|
|
qcam->height = 240;
|
|
qcam->transfer_scale = 4;
|
|
|
|
if(vw->width>=160 && vw->height>=120)
|
|
{
|
|
qcam->transfer_scale = 2;
|
|
}
|
|
if(vw->width>=320 && vw->height>=240)
|
|
{
|
|
qcam->width = 320;
|
|
qcam->height = 240;
|
|
qcam->transfer_scale = 1;
|
|
}
|
|
mutex_lock(&qcam->lock);
|
|
qc_setscanmode(qcam);
|
|
mutex_unlock(&qcam->lock);
|
|
|
|
/* We must update the camera before we grab. We could
|
|
just have changed the grab size */
|
|
qcam->status |= QC_PARAM_CHANGE;
|
|
|
|
/* Ok we figured out what to use from our wide choice */
|
|
return 0;
|
|
}
|
|
case VIDIOCGWIN:
|
|
{
|
|
struct video_window *vw = arg;
|
|
memset(vw, 0, sizeof(*vw));
|
|
vw->width=qcam->width/qcam->transfer_scale;
|
|
vw->height=qcam->height/qcam->transfer_scale;
|
|
return 0;
|
|
}
|
|
case VIDIOCKEY:
|
|
return 0;
|
|
case VIDIOCCAPTURE:
|
|
case VIDIOCGFBUF:
|
|
case VIDIOCSFBUF:
|
|
case VIDIOCGFREQ:
|
|
case VIDIOCSFREQ:
|
|
case VIDIOCGAUDIO:
|
|
case VIDIOCSAUDIO:
|
|
return -EINVAL;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static long qcam_ioctl(struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
return video_usercopy(file, cmd, arg, qcam_do_ioctl);
|
|
}
|
|
|
|
static ssize_t qcam_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct video_device *v = video_devdata(file);
|
|
struct qcam_device *qcam=(struct qcam_device *)v;
|
|
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 int qcam_exclusive_open(struct file *file)
|
|
{
|
|
struct video_device *dev = video_devdata(file);
|
|
struct qcam_device *qcam = (struct qcam_device *)dev;
|
|
|
|
return test_and_set_bit(0, &qcam->in_use) ? -EBUSY : 0;
|
|
}
|
|
|
|
static int qcam_exclusive_release(struct file *file)
|
|
{
|
|
struct video_device *dev = video_devdata(file);
|
|
struct qcam_device *qcam = (struct qcam_device *)dev;
|
|
|
|
clear_bit(0, &qcam->in_use);
|
|
return 0;
|
|
}
|
|
|
|
static const struct v4l2_file_operations qcam_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = qcam_exclusive_open,
|
|
.release = qcam_exclusive_release,
|
|
.ioctl = qcam_ioctl,
|
|
.read = qcam_read,
|
|
};
|
|
static struct video_device qcam_template=
|
|
{
|
|
.name = "Connectix Quickcam",
|
|
.fops = &qcam_fops,
|
|
.release = video_device_release_empty,
|
|
};
|
|
|
|
#define MAX_CAMS 4
|
|
static struct qcam_device *qcams[MAX_CAMS];
|
|
static unsigned int num_cams;
|
|
|
|
static int init_bwqcam(struct parport *port)
|
|
{
|
|
struct qcam_device *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);
|
|
|
|
printk(KERN_INFO "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_device *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; parport[n] && n<MAX_CAMS; 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_device *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("Connectix Quickcam max-poll was above 5000. Using 5000.\n");
|
|
maxpoll = 5000;
|
|
}
|
|
|
|
if (yieldlines < 1) {
|
|
printk("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");
|