diff options
Diffstat (limited to 'drivers/media/parport/bw-qcam.c')
| -rw-r--r-- | drivers/media/parport/bw-qcam.c | 1113 |
1 files changed, 1113 insertions, 0 deletions
diff --git a/drivers/media/parport/bw-qcam.c b/drivers/media/parport/bw-qcam.c new file mode 100644 index 000000000000..5b75a64b199b --- /dev/null +++ b/drivers/media/parport/bw-qcam.c @@ -0,0 +1,1113 @@ +/* + * QuickCam Driver For Video4Linux. + * + * Video4Linux conversion work by Alan Cox. + * Parport compatibility by Phil Blundell. + * Busy loop avoidance by Mark Cooke. + * + * Module parameters: + * + * maxpoll=<1 - 5000> + * + * When polling the QuickCam for a response, busy-wait for a + * maximum of this many loops. The default of 250 gives little + * impact on interactive response. + * + * NOTE: If this parameter is set too high, the processor + * will busy wait until this loop times out, and then + * slowly poll for a further 5 seconds before failing + * the transaction. You have been warned. + * + * yieldlines=<1 - 250> + * + * When acquiring a frame from the camera, the data gathering + * loop will yield back to the scheduler after completing + * this many lines. The default of 4 provides a trade-off + * between increased frame acquisition time and impact on + * interactive response. + */ + +/* qcam-lib.c -- Library for programming with the Connectix QuickCam. + * See the included documentation for usage instructions and details + * of the protocol involved. */ + + +/* Version 0.5, August 4, 1996 */ +/* Version 0.7, August 27, 1996 */ +/* Version 0.9, November 17, 1996 */ + + +/****************************************************************** + +Copyright (C) 1996 by Scott Laird + +Permission is hereby granted, free of charge, to any person obtaining +a copy of this software and associated documentation files (the +"Software"), to deal in the Software without restriction, including +without limitation the rights to use, copy, modify, merge, publish, +distribute, sublicense, and/or sell copies of the Software, and to +permit persons to whom the Software is furnished to do so, subject to +the following conditions: + +The above copyright notice and this permission notice shall be +included in all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. +IN NO EVENT SHALL SCOTT LAIRD BE LIABLE FOR ANY CLAIM, DAMAGES OR +OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, +ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR +OTHER DEALINGS IN THE SOFTWARE. + +******************************************************************/ + +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/errno.h> +#include <linux/fs.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/mm.h> +#include <linux/parport.h> +#include <linux/sched.h> +#include <linux/videodev2.h> +#include <linux/mutex.h> +#include <asm/uaccess.h> +#include <media/v4l2-common.h> +#include <media/v4l2-ioctl.h> +#include <media/v4l2-device.h> +#include <media/v4l2-fh.h> +#include <media/v4l2-ctrls.h> +#include <media/v4l2-event.h> + +/* One from column A... */ +#define QC_NOTSET 0 +#define QC_UNIDIR 1 +#define QC_BIDIR 2 +#define QC_SERIAL 3 + +/* ... and one from column B */ +#define QC_ANY 0x00 +#define QC_FORCE_UNIDIR 0x10 +#define QC_FORCE_BIDIR 0x20 +#define QC_FORCE_SERIAL 0x30 +/* in the port_mode member */ + +#define QC_MODE_MASK 0x07 +#define QC_FORCE_MASK 0x70 + +#define MAX_HEIGHT 243 +#define MAX_WIDTH 336 + +/* Bit fields for status flags */ +#define QC_PARAM_CHANGE 0x01 /* Camera status change has occurred */ + +struct qcam { + struct v4l2_device v4l2_dev; + struct video_device vdev; + struct v4l2_ctrl_handler hdl; + struct pardevice *pdev; + struct parport *pport; + struct mutex lock; + int width, height; + int bpp; + int mode; + int contrast, brightness, whitebal; + int port_mode; + int transfer_scale; + int top, left; + int status; + unsigned int saved_bits; + unsigned long in_use; +}; + +static unsigned int maxpoll = 250; /* Maximum busy-loop count for qcam I/O */ +static unsigned int yieldlines = 4; /* Yield after this many during capture */ +static int video_nr = -1; +static unsigned int force_init; /* Whether to probe aggressively */ + +module_param(maxpoll, int, 0); +module_param(yieldlines, int, 0); +module_param(video_nr, int, 0); + +/* Set force_init=1 to avoid detection by polling status register and + * immediately attempt to initialize qcam */ +module_param(force_init, int, 0); + +#define MAX_CAMS 4 +static struct qcam *qcams[MAX_CAMS]; +static unsigned int num_cams; + +static inline int read_lpstatus(struct qcam *q) +{ + return parport_read_status(q->pport); +} + +static inline int read_lpdata(struct qcam *q) +{ + return parport_read_data(q->pport); +} + +static inline void write_lpdata(struct qcam *q, int d) +{ + parport_write_data(q->pport, d); +} + +static void write_lpcontrol(struct qcam *q, int d) +{ + if (d & 0x20) { + /* Set bidirectional mode to reverse (data in) */ + parport_data_reverse(q->pport); + } else { + /* Set bidirectional mode to forward (data out) */ + parport_data_forward(q->pport); + } + + /* Now issue the regular port command, but strip out the + * direction flag */ + d &= ~0x20; + parport_write_control(q->pport, d); +} + + +/* qc_waithand busy-waits for a handshake signal from the QuickCam. + * Almost all communication with the camera requires handshaking. */ + +static int qc_waithand(struct qcam *q, int val) +{ + int status; + int runs = 0; + + if (val) { + while (!((status = read_lpstatus(q)) & 8)) { + /* 1000 is enough spins on the I/O for all normal + cases, at that point we start to poll slowly + until the camera wakes up. However, we are + busy blocked until the camera responds, so + setting it lower is much better for interactive + response. */ + + if (runs++ > maxpoll) + msleep_interruptible(5); + if (runs > (maxpoll + 1000)) /* 5 seconds */ + return -1; + } + } else { + while (((status = read_lpstatus(q)) & 8)) { + /* 1000 is enough spins on the I/O for all normal + cases, at that point we start to poll slowly + until the camera wakes up. However, we are + busy blocked until the camera responds, so + setting it lower is much better for interactive + response. */ + + if (runs++ > maxpoll) + msleep_interruptible(5); + if (runs++ > (maxpoll + 1000)) /* 5 seconds */ + return -1; + } + } + + return status; +} + +/* Waithand2 is used when the qcam is in bidirectional mode, and the + * handshaking signal is CamRdy2 (bit 0 of data reg) instead of CamRdy1 + * (bit 3 of status register). It also returns the last value read, + * since this data is useful. */ + +static unsigned int qc_waithand2(struct qcam *q, int val) +{ + unsigned int status; + int runs = 0; + + do { + status = read_lpdata(q); + /* 1000 is enough spins on the I/O for all normal + cases, at that point we start to poll slowly + until the camera wakes up. However, we are + busy blocked until the camera responds, so + setting it lower is much better for interactive + response. */ + + if (runs++ > maxpoll) + msleep_interruptible(5); + if (runs++ > (maxpoll + 1000)) /* 5 seconds */ + return 0; + } while ((status & 1) != val); + + return status; +} + +/* qc_command is probably a bit of a misnomer -- it's used to send + * bytes *to* the camera. Generally, these bytes are either commands + * or arguments to commands, so the name fits, but it still bugs me a + * bit. See the documentation for a list of commands. */ + +static int qc_command(struct qcam *q, int command) +{ + int n1, n2; + int cmd; + + write_lpdata(q, command); + write_lpcontrol(q, 6); + + n1 = qc_waithand(q, 1); + + write_lpcontrol(q, 0xe); + n2 = qc_waithand(q, 0); + + cmd = (n1 & 0xf0) | ((n2 & 0xf0) >> 4); + return cmd; +} + +static int qc_readparam(struct qcam *q) +{ + int n1, n2; + int cmd; + + write_lpcontrol(q, 6); + n1 = qc_waithand(q, 1); + + write_lpcontrol(q, 0xe); + n2 = qc_waithand(q, 0); + + cmd = (n1 & 0xf0) | ((n2 & 0xf0) >> 4); + return cmd; +} + + +/* Try to detect a QuickCam. It appears to flash the upper 4 bits of + the status register at 5-10 Hz. This is only used in the autoprobe + code. Be aware that this isn't the way Connectix detects the + camera (they send a reset and try to handshake), but this should be + almost completely safe, while their method screws up my printer if + I plug it in before the camera. */ + +static int qc_detect(struct qcam *q) +{ + int reg, lastreg; + int count = 0; + int i; + + if (force_init) + return 1; + + lastreg = reg = read_lpstatus(q) & 0xf0; + + for (i = 0; i < 500; i++) { + reg = read_lpstatus(q) & 0xf0; + if (reg != lastreg) + count++; + lastreg = reg; + mdelay(2); + } + + +#if 0 + /* Force camera detection during testing. Sometimes the camera + won't be flashing these bits. Possibly unloading the module + in the middle of a grab? Or some timeout condition? + I've seen this parameter as low as 19 on my 450Mhz box - mpc */ + printk(KERN_DEBUG "Debugging: QCam detection counter <30-200 counts as detected>: %d\n", count); + return 1; +#endif + + /* Be (even more) liberal in what you accept... */ + + if (count > 20 && count < 400) { + return 1; /* found */ + } else { + printk(KERN_ERR "No Quickcam found on port %s\n", + q->pport->name); + printk(KERN_DEBUG "Quickcam detection counter: %u\n", count); + return 0; /* not found */ + } +} + +/* Decide which scan mode to use. There's no real requirement that + * the scanmode match the resolution in q->height and q-> width -- the + * camera takes the picture at the resolution specified in the + * "scanmode" and then returns the image at the resolution specified + * with the resolution commands. If the scan is bigger than the + * requested resolution, the upper-left hand corner of the scan is + * returned. If the scan is smaller, then the rest of the image + * returned contains garbage. */ + +static int qc_setscanmode(struct qcam *q) +{ + int old_mode = q->mode; + + switch (q->transfer_scale) { + case 1: + q->mode = 0; + break; + case 2: + q->mode = 4; + break; + case 4: + q->mode = 8; + break; + } + + switch (q->bpp) { + case 4: + break; + case 6: + q->mode += 2; + break; + } + + switch (q->port_mode & QC_MODE_MASK) { + case QC_BIDIR: + q->mode += 1; + break; + case QC_NOTSET: + case QC_UNIDIR: + break; + } + + if (q->mode != old_mode) + q->status |= QC_PARAM_CHANGE; + + return 0; +} + + +/* Reset the QuickCam. This uses the same sequence the Windows + * QuickPic program uses. Someone with a bi-directional port should + * check that bi-directional mode is detected right, and then + * implement bi-directional mode in qc_readbyte(). */ + +static void qc_reset(struct qcam *q) +{ + switch (q->port_mode & QC_FORCE_MASK) { + case QC_FORCE_UNIDIR: + q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_UNIDIR; + break; + + case QC_FORCE_BIDIR: + q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_BIDIR; + break; + + case QC_ANY: + write_lpcontrol(q, 0x20); + write_lpdata(q, 0x75); + + if (read_lpdata(q) != 0x75) + q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_BIDIR; + else + q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_UNIDIR; + break; + } + + write_lpcontrol(q, 0xb); + udelay(250); + write_lpcontrol(q, 0xe); + qc_setscanmode(q); /* in case port_mode changed */ +} + + + +/* Reset the QuickCam and program for brightness, contrast, + * white-balance, and resolution. */ + +static void qc_set(struct qcam *q) +{ + int val; + int val2; + + qc_reset(q); + + /* Set the brightness. Yes, this is repetitive, but it works. + * Shorter versions seem to fail subtly. Feel free to try :-). */ + /* I think the problem was in qc_command, not here -- bls */ + + qc_command(q, 0xb); + qc_command(q, q->brightness); + + val = q->height / q->transfer_scale; + qc_command(q, 0x11); + qc_command(q, val); + if ((q->port_mode & QC_MODE_MASK) == QC_UNIDIR && q->bpp == 6) { + /* The normal "transfers per line" calculation doesn't seem to work + as expected here (and yet it works fine in qc_scan). No idea + why this case is the odd man out. Fortunately, Laird's original + working version gives me a good way to guess at working values. + -- bls */ + val = q->width; + val2 = q->transfer_scale * 4; + } else { + val = q->width * q->bpp; + val2 = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) * + q->transfer_scale; + } + val = DIV_ROUND_UP(val, val2); + qc_command(q, 0x13); + qc_command(q, val); + + /* Setting top and left -- bls */ + qc_command(q, 0xd); + qc_command(q, q->top); + qc_command(q, 0xf); + qc_command(q, q->left / 2); + + qc_command(q, 0x19); + qc_command(q, q->contrast); + qc_command(q, 0x1f); + qc_command(q, q->whitebal); + + /* Clear flag that we must update the grabbing parameters on the camera + before we grab the next frame */ + q->status &= (~QC_PARAM_CHANGE); +} + +/* Qc_readbytes reads some bytes from the QC and puts them in + the supplied buffer. It returns the number of bytes read, + or -1 on error. */ + +static inline int qc_readbytes(struct qcam *q, char buffer[]) +{ + int ret = 1; + unsigned int hi, lo; + unsigned int hi2, lo2; + static int state; + + if (buffer == NULL) { + state = 0; + return 0; + } + + switch (q->port_mode & QC_MODE_MASK) { + case QC_BIDIR: /* Bi-directional Port */ + write_lpcontrol(q, 0x26); + lo = (qc_waithand2(q, 1) >> 1); + hi = (read_lpstatus(q) >> 3) & 0x1f; + 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 *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) { + u8 ch = invert - buffer[k]; + got++; + put_user(ch << 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, "Connectix B&W Quickcam", sizeof(vcap->card)); + strlcpy(vcap->bus_info, qcam->pport->name, sizeof(vcap->bus_info)); + vcap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE; + vcap->capabilities = vcap->device_caps | V4L2_CAP_DEVICE_CAPS; + 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_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 = pix->width; + pix->sizeimage = pix->width * pix->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 } + }, + { 1, 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 int qcam_enum_framesizes(struct file *file, void *fh, + struct v4l2_frmsizeenum *fsize) +{ + static const struct v4l2_frmsize_discrete sizes[] = { + { 80, 60 }, + { 160, 120 }, + { 320, 240 }, + }; + + if (fsize->index > 2) + return -EINVAL; + if (fsize->pixel_format != V4L2_PIX_FMT_Y4 && + fsize->pixel_format != V4L2_PIX_FMT_Y6) + return -EINVAL; + fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE; + fsize->discrete = sizes[fsize->index]; + 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 unsigned int qcam_poll(struct file *filp, poll_table *wait) +{ + return v4l2_ctrl_poll(filp, wait) | POLLIN | POLLRDNORM; +} + +static int qcam_s_ctrl(struct v4l2_ctrl *ctrl) +{ + struct qcam *qcam = + container_of(ctrl->handler, struct qcam, hdl); + int ret = 0; + + mutex_lock(&qcam->lock); + switch (ctrl->id) { + case V4L2_CID_BRIGHTNESS: + qcam->brightness = ctrl->val; + break; + case V4L2_CID_CONTRAST: + qcam->contrast = ctrl->val; + break; + case V4L2_CID_GAMMA: + qcam->whitebal = ctrl->val; + break; + default: + ret = -EINVAL; + break; + } + if (ret == 0) { + qc_setscanmode(qcam); + qcam->status |= QC_PARAM_CHANGE; + } + mutex_unlock(&qcam->lock); + return ret; +} + +static const struct v4l2_file_operations qcam_fops = { + .owner = THIS_MODULE, + .open = v4l2_fh_open, + .release = v4l2_fh_release, + .poll = qcam_poll, + .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_enum_fmt_vid_cap = qcam_enum_fmt_vid_cap, + .vidioc_enum_framesizes = qcam_enum_framesizes, + .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, + .vidioc_log_status = v4l2_ctrl_log_status, + .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, + .vidioc_unsubscribe_event = v4l2_event_unsubscribe, +}; + +static const struct v4l2_ctrl_ops qcam_ctrl_ops = { + .s_ctrl = qcam_s_ctrl, +}; + +/* 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; + snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "bw-qcam%d", num_cams); + + if (v4l2_device_register(port->dev, v4l2_dev) < 0) { + v4l2_err(v4l2_dev, "Could not register v4l2_device\n"); + kfree(qcam); + return NULL; + } + + v4l2_ctrl_handler_init(&qcam->hdl, 3); + v4l2_ctrl_new_std(&qcam->hdl, &qcam_ctrl_ops, + V4L2_CID_BRIGHTNESS, 0, 255, 1, 180); + v4l2_ctrl_new_std(&qcam->hdl, &qcam_ctrl_ops, + V4L2_CID_CONTRAST, 0, 255, 1, 192); + v4l2_ctrl_new_std(&qcam->hdl, &qcam_ctrl_ops, + V4L2_CID_GAMMA, 0, 255, 1, 105); + if (qcam->hdl.error) { + v4l2_err(v4l2_dev, "couldn't register controls\n"); + v4l2_ctrl_handler_free(&qcam->hdl); + kfree(qcam); + return NULL; + } + qcam->pport = port; + qcam->pdev = parport_register_device(port, v4l2_dev->name, NULL, NULL, + NULL, 0, NULL); + if (qcam->pdev == NULL) { + v4l2_err(v4l2_dev, "couldn't register for %s.\n", port->name); + v4l2_ctrl_handler_free(&qcam->hdl); + kfree(qcam); + return NULL; + } + + strlcpy(qcam->vdev.name, "Connectix QuickCam", sizeof(qcam->vdev.name)); + qcam->vdev.v4l2_dev = v4l2_dev; + qcam->vdev.ctrl_handler = &qcam->hdl; + qcam->vdev.fops = &qcam_fops; + qcam->vdev.ioctl_ops = &qcam_ioctl_ops; + set_bit(V4L2_FL_USE_FH_PRIO, &qcam->vdev.flags); + 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); + v4l2_ctrl_handler_setup(&qcam->hdl); + + 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); + v4l2_ctrl_handler_free(&qcam->hdl); + 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"); +MODULE_VERSION("0.0.3"); |