aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/parport/c-qcam.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/media/parport/c-qcam.c')
-rw-r--r--drivers/media/parport/c-qcam.c883
1 files changed, 883 insertions, 0 deletions
diff --git a/drivers/media/parport/c-qcam.c b/drivers/media/parport/c-qcam.c
new file mode 100644
index 000000000000..ec51e1f12e82
--- /dev/null
+++ b/drivers/media/parport/c-qcam.c
@@ -0,0 +1,883 @@
+/*
+ * Video4Linux Colour QuickCam driver
+ * Copyright 1997-2000 Philip Blundell <philb@gnu.org>
+ *
+ * Module parameters:
+ *
+ * parport=auto -- probe all parports (default)
+ * parport=0 -- parport0 becomes qcam1
+ * parport=2,0,1 -- parports 2,0,1 are tried in that order
+ *
+ * probe=0 -- do no probing, assume camera is present
+ * probe=1 -- use IEEE-1284 autoprobe data only (default)
+ * probe=2 -- probe aggressively for cameras
+ *
+ * force_rgb=1 -- force data format to RGB (default is BGR)
+ *
+ * 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>
+ *
+ * Fixed data format to BGR, added force_rgb parameter. Added missing
+ * parport_unregister_driver() on module removal.
+ * -- May 28, 2000 Claudio Matsuoka <claudio@conectiva.com>
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/parport.h>
+#include <linux/sched.h>
+#include <linux/mutex.h>
+#include <linux/jiffies.h>
+#include <linux/videodev2.h>
+#include <asm/uaccess.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
+
+struct qcam {
+ struct v4l2_device v4l2_dev;
+ struct video_device vdev;
+ struct v4l2_ctrl_handler hdl;
+ struct pardevice *pdev;
+ struct parport *pport;
+ int width, height;
+ int ccd_width, ccd_height;
+ int mode;
+ int contrast, brightness, whitebal;
+ int top, left;
+ unsigned int bidirectional;
+ struct mutex lock;
+};
+
+/* cameras maximum */
+#define MAX_CAMS 4
+
+/* The three possible QuickCam modes */
+#define QC_MILLIONS 0x18
+#define QC_BILLIONS 0x10
+#define QC_THOUSANDS 0x08 /* with VIDEC compression (not supported) */
+
+/* The three possible decimations */
+#define QC_DECIMATION_1 0
+#define QC_DECIMATION_2 2
+#define QC_DECIMATION_4 4
+
+#define BANNER "Colour QuickCam for Video4Linux v0.06"
+
+static int parport[MAX_CAMS] = { [1 ... MAX_CAMS-1] = -1 };
+static int probe = 2;
+static bool force_rgb;
+static int video_nr = -1;
+
+/* FIXME: parport=auto would never have worked, surely? --RR */
+MODULE_PARM_DESC(parport, "parport=<auto|n[,n]...> for port detection method\n"
+ "probe=<0|1|2> for camera detection method\n"
+ "force_rgb=<0|1> for RGB data format (default BGR)");
+module_param_array(parport, int, NULL, 0);
+module_param(probe, int, 0);
+module_param(force_rgb, bool, 0);
+module_param(video_nr, int, 0);
+
+static struct qcam *qcams[MAX_CAMS];
+static unsigned int num_cams;
+
+static inline void qcam_set_ack(struct qcam *qcam, unsigned int i)
+{
+ /* note: the QC specs refer to the PCAck pin by voltage, not
+ software level. PC ports have builtin inverters. */
+ parport_frob_control(qcam->pport, 8, i ? 8 : 0);
+}
+
+static inline unsigned int qcam_ready1(struct qcam *qcam)
+{
+ return (parport_read_status(qcam->pport) & 0x8) ? 1 : 0;
+}
+
+static inline unsigned int qcam_ready2(struct qcam *qcam)
+{
+ return (parport_read_data(qcam->pport) & 0x1) ? 1 : 0;
+}
+
+static unsigned int qcam_await_ready1(struct qcam *qcam, int value)
+{
+ struct v4l2_device *v4l2_dev = &qcam->v4l2_dev;
+ unsigned long oldjiffies = jiffies;
+ unsigned int i;
+
+ for (oldjiffies = jiffies;
+ time_before(jiffies, oldjiffies + msecs_to_jiffies(40));)
+ if (qcam_ready1(qcam) == value)
+ return 0;
+
+ /* If the camera didn't respond within 1/25 second, poll slowly
+ for a while. */
+ for (i = 0; i < 50; i++) {
+ if (qcam_ready1(qcam) == value)
+ return 0;
+ msleep_interruptible(100);
+ }
+
+ /* Probably somebody pulled the plug out. Not much we can do. */
+ v4l2_err(v4l2_dev, "ready1 timeout (%d) %x %x\n", value,
+ parport_read_status(qcam->pport),
+ parport_read_control(qcam->pport));
+ return 1;
+}
+
+static unsigned int qcam_await_ready2(struct qcam *qcam, int value)
+{
+ struct v4l2_device *v4l2_dev = &qcam->v4l2_dev;
+ unsigned long oldjiffies = jiffies;
+ unsigned int i;
+
+ for (oldjiffies = jiffies;
+ time_before(jiffies, oldjiffies + msecs_to_jiffies(40));)
+ if (qcam_ready2(qcam) == value)
+ return 0;
+
+ /* If the camera didn't respond within 1/25 second, poll slowly
+ for a while. */
+ for (i = 0; i < 50; i++) {
+ if (qcam_ready2(qcam) == value)
+ return 0;
+ msleep_interruptible(100);
+ }
+
+ /* Probably somebody pulled the plug out. Not much we can do. */
+ v4l2_err(v4l2_dev, "ready2 timeout (%d) %x %x %x\n", value,
+ parport_read_status(qcam->pport),
+ parport_read_control(qcam->pport),
+ parport_read_data(qcam->pport));
+ return 1;
+}
+
+static int qcam_read_data(struct qcam *qcam)
+{
+ unsigned int idata;
+
+ qcam_set_ack(qcam, 0);
+ if (qcam_await_ready1(qcam, 1))
+ return -1;
+ idata = parport_read_status(qcam->pport) & 0xf0;
+ qcam_set_ack(qcam, 1);
+ if (qcam_await_ready1(qcam, 0))
+ return -1;
+ idata |= parport_read_status(qcam->pport) >> 4;
+ return idata;
+}
+
+static int qcam_write_data(struct qcam *qcam, unsigned int data)
+{
+ struct v4l2_device *v4l2_dev = &qcam->v4l2_dev;
+ unsigned int idata;
+
+ parport_write_data(qcam->pport, data);
+ idata = qcam_read_data(qcam);
+ if (data != idata) {
+ v4l2_warn(v4l2_dev, "sent %x but received %x\n", data,
+ idata);
+ return 1;
+ }
+ return 0;
+}
+
+static inline int qcam_set(struct qcam *qcam, unsigned int cmd, unsigned int data)
+{
+ if (qcam_write_data(qcam, cmd))
+ return -1;
+ if (qcam_write_data(qcam, data))
+ return -1;
+ return 0;
+}
+
+static inline int qcam_get(struct qcam *qcam, unsigned int cmd)
+{
+ if (qcam_write_data(qcam, cmd))
+ return -1;
+ return qcam_read_data(qcam);
+}
+
+static int qc_detect(struct qcam *qcam)
+{
+ unsigned int stat, ostat, i, count = 0;
+
+ /* The probe routine below is not very reliable. The IEEE-1284
+ probe takes precedence. */
+ /* XXX Currently parport provides no way to distinguish between
+ "the IEEE probe was not done" and "the probe was done, but
+ no device was found". Fix this one day. */
+ if (qcam->pport->probe_info[0].class == PARPORT_CLASS_MEDIA
+ && qcam->pport->probe_info[0].model
+ && !strcmp(qcam->pdev->port->probe_info[0].model,
+ "Color QuickCam 2.0")) {
+ printk(KERN_DEBUG "QuickCam: Found by IEEE1284 probe.\n");
+ return 1;
+ }
+
+ if (probe < 2)
+ return 0;
+
+ parport_write_control(qcam->pport, 0xc);
+
+ /* look for a heartbeat */
+ ostat = stat = parport_read_status(qcam->pport);
+ for (i = 0; i < 250; i++) {
+ mdelay(1);
+ stat = parport_read_status(qcam->pport);
+ if (ostat != stat) {
+ if (++count >= 3)
+ return 1;
+ ostat = stat;
+ }
+ }
+
+ /* Reset the camera and try again */
+ parport_write_control(qcam->pport, 0xc);
+ parport_write_control(qcam->pport, 0x8);
+ mdelay(1);
+ parport_write_control(qcam->pport, 0xc);
+ mdelay(1);
+ count = 0;
+
+ ostat = stat = parport_read_status(qcam->pport);
+ for (i = 0; i < 250; i++) {
+ mdelay(1);
+ stat = parport_read_status(qcam->pport);
+ if (ostat != stat) {
+ if (++count >= 3)
+ return 1;
+ ostat = stat;
+ }
+ }
+
+ /* no (or flatline) camera, give up */
+ return 0;
+}
+
+static void qc_reset(struct qcam *qcam)
+{
+ parport_write_control(qcam->pport, 0xc);
+ parport_write_control(qcam->pport, 0x8);
+ mdelay(1);
+ parport_write_control(qcam->pport, 0xc);
+ mdelay(1);
+}
+
+/* Reset the QuickCam and program for brightness, contrast,
+ * white-balance, and resolution. */
+
+static void qc_setup(struct qcam *qcam)
+{
+ qc_reset(qcam);
+
+ /* Set the brightness. */
+ qcam_set(qcam, 11, qcam->brightness);
+
+ /* Set the height and width. These refer to the actual
+ CCD area *before* applying the selected decimation. */
+ qcam_set(qcam, 17, qcam->ccd_height);
+ qcam_set(qcam, 19, qcam->ccd_width / 2);
+
+ /* Set top and left. */
+ qcam_set(qcam, 0xd, qcam->top);
+ qcam_set(qcam, 0xf, qcam->left);
+
+ /* Set contrast and white balance. */
+ qcam_set(qcam, 0x19, qcam->contrast);
+ qcam_set(qcam, 0x1f, qcam->whitebal);
+
+ /* Set the speed. */
+ qcam_set(qcam, 45, 2);
+}
+
+/* Read some bytes from the camera and put them in the buffer.
+ nbytes should be a multiple of 3, because bidirectional mode gives
+ us three bytes at a time. */
+
+static unsigned int qcam_read_bytes(struct qcam *qcam, unsigned char *buf, unsigned int nbytes)
+{
+ unsigned int bytes = 0;
+
+ qcam_set_ack(qcam, 0);
+ if (qcam->bidirectional) {
+ /* It's a bidirectional port */
+ while (bytes < nbytes) {
+ unsigned int lo1, hi1, lo2, hi2;
+ unsigned char r, g, b;
+
+ if (qcam_await_ready2(qcam, 1))
+ return bytes;
+ lo1 = parport_read_data(qcam->pport) >> 1;
+ hi1 = ((parport_read_status(qcam->pport) >> 3) & 0x1f) ^ 0x10;
+ qcam_set_ack(qcam, 1);
+ if (qcam_await_ready2(qcam, 0))
+ return bytes;
+ lo2 = parport_read_data(qcam->pport) >> 1;
+ hi2 = ((parport_read_status(qcam->pport) >> 3) & 0x1f) ^ 0x10;
+ qcam_set_ack(qcam, 0);
+ r = lo1 | ((hi1 & 1) << 7);
+ g = ((hi1 & 0x1e) << 3) | ((hi2 & 0x1e) >> 1);
+ b = lo2 | ((hi2 & 1) << 7);
+ if (force_rgb) {
+ buf[bytes++] = r;
+ buf[bytes++] = g;
+ buf[bytes++] = b;
+ } else {
+ buf[bytes++] = b;
+ buf[bytes++] = g;
+ buf[bytes++] = r;
+ }
+ }
+ } else {
+ /* It's a unidirectional port */
+ int i = 0, n = bytes;
+ unsigned char rgb[3];
+
+ while (bytes < nbytes) {
+ unsigned int hi, lo;
+
+ if (qcam_await_ready1(qcam, 1))
+ return bytes;
+ hi = (parport_read_status(qcam->pport) & 0xf0);
+ qcam_set_ack(qcam, 1);
+ if (qcam_await_ready1(qcam, 0))
+ return bytes;
+ lo = (parport_read_status(qcam->pport) & 0xf0);
+ qcam_set_ack(qcam, 0);
+ /* flip some bits */
+ rgb[(i = bytes++ % 3)] = (hi | (lo >> 4)) ^ 0x88;
+ if (i >= 2) {
+get_fragment:
+ if (force_rgb) {
+ buf[n++] = rgb[0];
+ buf[n++] = rgb[1];
+ buf[n++] = rgb[2];
+ } else {
+ buf[n++] = rgb[2];
+ buf[n++] = rgb[1];
+ buf[n++] = rgb[0];
+ }
+ }
+ }
+ if (i) {
+ i = 0;
+ goto get_fragment;
+ }
+ }
+ return bytes;
+}
+
+#define BUFSZ 150
+
+static long qc_capture(struct qcam *qcam, char __user *buf, unsigned long len)
+{
+ struct v4l2_device *v4l2_dev = &qcam->v4l2_dev;
+ unsigned lines, pixelsperline;
+ unsigned int is_bi_dir = qcam->bidirectional;
+ size_t wantlen, outptr = 0;
+ char tmpbuf[BUFSZ];
+
+ if (!access_ok(VERIFY_WRITE, buf, len))
+ return -EFAULT;
+
+ /* Wait for camera to become ready */
+ for (;;) {
+ int i = qcam_get(qcam, 41);
+
+ if (i == -1) {
+ qc_setup(qcam);
+ return -EIO;
+ }
+ if ((i & 0x80) == 0)
+ break;
+ schedule();
+ }
+
+ if (qcam_set(qcam, 7, (qcam->mode | (is_bi_dir ? 1 : 0)) + 1))
+ return -EIO;
+
+ lines = qcam->height;
+ pixelsperline = qcam->width;
+
+ if (is_bi_dir) {
+ /* Turn the port around */
+ parport_data_reverse(qcam->pport);
+ mdelay(3);
+ qcam_set_ack(qcam, 0);
+ if (qcam_await_ready1(qcam, 1)) {
+ qc_setup(qcam);
+ return -EIO;
+ }
+ qcam_set_ack(qcam, 1);
+ if (qcam_await_ready1(qcam, 0)) {
+ qc_setup(qcam);
+ return -EIO;
+ }
+ }
+
+ wantlen = lines * pixelsperline * 24 / 8;
+
+ while (wantlen) {
+ size_t t, s;
+
+ s = (wantlen > BUFSZ) ? BUFSZ : wantlen;
+ t = qcam_read_bytes(qcam, tmpbuf, s);
+ if (outptr < len) {
+ size_t sz = len - outptr;
+
+ if (sz > t)
+ sz = t;
+ if (__copy_to_user(buf + outptr, tmpbuf, sz))
+ break;
+ outptr += sz;
+ }
+ wantlen -= t;
+ if (t < s)
+ break;
+ cond_resched();
+ }
+
+ len = outptr;
+
+ if (wantlen) {
+ v4l2_err(v4l2_dev, "short read.\n");
+ if (is_bi_dir)
+ parport_data_forward(qcam->pport);
+ qc_setup(qcam);
+ return len;
+ }
+
+ if (is_bi_dir) {
+ int l;
+
+ do {
+ l = qcam_read_bytes(qcam, tmpbuf, 3);
+ cond_resched();
+ } while (l && (tmpbuf[0] == 0x7e || tmpbuf[1] == 0x7e || tmpbuf[2] == 0x7e));
+ if (force_rgb) {
+ if (tmpbuf[0] != 0xe || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xf)
+ v4l2_err(v4l2_dev, "bad EOF\n");
+ } else {
+ if (tmpbuf[0] != 0xf || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xe)
+ v4l2_err(v4l2_dev, "bad EOF\n");
+ }
+ qcam_set_ack(qcam, 0);
+ if (qcam_await_ready1(qcam, 1)) {
+ v4l2_err(v4l2_dev, "no ack after EOF\n");
+ parport_data_forward(qcam->pport);
+ qc_setup(qcam);
+ return len;
+ }
+ parport_data_forward(qcam->pport);
+ mdelay(3);
+ qcam_set_ack(qcam, 1);
+ if (qcam_await_ready1(qcam, 0)) {
+ v4l2_err(v4l2_dev, "no ack to port turnaround\n");
+ qc_setup(qcam);
+ return len;
+ }
+ } else {
+ int l;
+
+ do {
+ l = qcam_read_bytes(qcam, tmpbuf, 1);
+ cond_resched();
+ } while (l && tmpbuf[0] == 0x7e);
+ l = qcam_read_bytes(qcam, tmpbuf + 1, 2);
+ if (force_rgb) {
+ if (tmpbuf[0] != 0xe || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xf)
+ v4l2_err(v4l2_dev, "bad EOF\n");
+ } else {
+ if (tmpbuf[0] != 0xf || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xe)
+ v4l2_err(v4l2_dev, "bad EOF\n");
+ }
+ }
+
+ qcam_write_data(qcam, 0);
+ 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, "Color Quickcam", sizeof(vcap->card));
+ strlcpy(vcap->bus_info, "parport", 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;
+ pix->height = qcam->height;
+ pix->pixelformat = V4L2_PIX_FMT_RGB24;
+ pix->field = V4L2_FIELD_NONE;
+ pix->bytesperline = 3 * qcam->width;
+ pix->sizeimage = 3 * 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;
+ }
+ pix->pixelformat = V4L2_PIX_FMT_RGB24;
+ pix->field = V4L2_FIELD_NONE;
+ pix->bytesperline = 3 * pix->width;
+ pix->sizeimage = 3 * 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;
+ switch (pix->height) {
+ case 60:
+ qcam->mode = QC_DECIMATION_4;
+ break;
+ case 120:
+ qcam->mode = QC_DECIMATION_2;
+ break;
+ default:
+ qcam->mode = QC_DECIMATION_1;
+ break;
+ }
+
+ mutex_lock(&qcam->lock);
+ qcam->mode |= QC_MILLIONS;
+ qcam->height = pix->height;
+ qcam->width = pix->width;
+ parport_claim_or_block(qcam->pdev);
+ qc_setup(qcam);
+ parport_release(qcam->pdev);
+ 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,
+ "RGB 8:8:8", V4L2_PIX_FMT_RGB24,
+ { 0, 0, 0, 0 }
+ },
+ };
+ enum v4l2_buf_type type = fmt->type;
+
+ if (fmt->index > 0)
+ 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;
+
+ mutex_lock(&qcam->lock);
+ parport_claim_or_block(qcam->pdev);
+ /* Probably should have a semaphore against multiple users */
+ len = qc_capture(qcam, buf, count);
+ parport_release(qcam->pdev);
+ mutex_unlock(&qcam->lock);
+ return len;
+}
+
+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) {
+ parport_claim_or_block(qcam->pdev);
+ qc_setup(qcam);
+ parport_release(qcam->pdev);
+ }
+ 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 = v4l2_ctrl_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_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. */
+
+static struct qcam *qcam_init(struct parport *port)
+{
+ struct qcam *qcam;
+ struct v4l2_device *v4l2_dev;
+
+ qcam = kzalloc(sizeof(*qcam), GFP_KERNEL);
+ if (qcam == NULL)
+ return NULL;
+
+ v4l2_dev = &qcam->v4l2_dev;
+ strlcpy(v4l2_dev->name, "c-qcam", sizeof(v4l2_dev->name));
+
+ if (v4l2_device_register(NULL, 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, 240);
+ 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, 128);
+ 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, "c-qcam", NULL, NULL,
+ NULL, 0, NULL);
+
+ qcam->bidirectional = (qcam->pport->modes & PARPORT_MODE_TRISTATE) ? 1 : 0;
+
+ 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, "Colour 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;
+ qcam->vdev.ctrl_handler = &qcam->hdl;
+ set_bit(V4L2_FL_USE_FH_PRIO, &qcam->vdev.flags);
+ video_set_drvdata(&qcam->vdev, qcam);
+
+ mutex_init(&qcam->lock);
+ qcam->width = qcam->ccd_width = 320;
+ qcam->height = qcam->ccd_height = 240;
+ qcam->mode = QC_MILLIONS | QC_DECIMATION_1;
+ qcam->contrast = 192;
+ qcam->brightness = 240;
+ qcam->whitebal = 128;
+ qcam->top = 1;
+ qcam->left = 14;
+ return qcam;
+}
+
+static int init_cqcam(struct parport *port)
+{
+ struct qcam *qcam;
+ struct v4l2_device *v4l2_dev;
+
+ if (parport[0] != -1) {
+ /* The user gave specific instructions */
+ int i, found = 0;
+
+ for (i = 0; i < MAX_CAMS && parport[i] != -1; i++) {
+ if (parport[0] == port->number)
+ found = 1;
+ }
+ if (!found)
+ return -ENODEV;
+ }
+
+ if (num_cams == MAX_CAMS)
+ return -ENOSPC;
+
+ qcam = qcam_init(port);
+ if (qcam == NULL)
+ return -ENODEV;
+
+ v4l2_dev = &qcam->v4l2_dev;
+
+ parport_claim_or_block(qcam->pdev);
+
+ qc_reset(qcam);
+
+ if (probe && qc_detect(qcam) == 0) {
+ parport_release(qcam->pdev);
+ parport_unregister_device(qcam->pdev);
+ kfree(qcam);
+ return -ENODEV;
+ }
+
+ qc_setup(qcam);
+
+ parport_release(qcam->pdev);
+
+ if (video_register_device(&qcam->vdev, VFL_TYPE_GRABBER, video_nr) < 0) {
+ v4l2_err(v4l2_dev, "Unable to register Colour QuickCam on %s\n",
+ qcam->pport->name);
+ parport_unregister_device(qcam->pdev);
+ kfree(qcam);
+ return -ENODEV;
+ }
+
+ v4l2_info(v4l2_dev, "%s: Colour QuickCam found on %s\n",
+ video_device_node_name(&qcam->vdev), qcam->pport->name);
+
+ qcams[num_cams++] = qcam;
+
+ return 0;
+}
+
+static void close_cqcam(struct qcam *qcam)
+{
+ video_unregister_device(&qcam->vdev);
+ v4l2_ctrl_handler_free(&qcam->hdl);
+ parport_unregister_device(qcam->pdev);
+ kfree(qcam);
+}
+
+static void cq_attach(struct parport *port)
+{
+ init_cqcam(port);
+}
+
+static void cq_detach(struct parport *port)
+{
+ /* Write this some day. */
+}
+
+static struct parport_driver cqcam_driver = {
+ .name = "cqcam",
+ .attach = cq_attach,
+ .detach = cq_detach,
+};
+
+static int __init cqcam_init(void)
+{
+ printk(KERN_INFO BANNER "\n");
+
+ return parport_register_driver(&cqcam_driver);
+}
+
+static void __exit cqcam_cleanup(void)
+{
+ unsigned int i;
+
+ for (i = 0; i < num_cams; i++)
+ close_cqcam(qcams[i]);
+
+ parport_unregister_driver(&cqcam_driver);
+}
+
+MODULE_AUTHOR("Philip Blundell <philb@gnu.org>");
+MODULE_DESCRIPTION(BANNER);
+MODULE_LICENSE("GPL");
+MODULE_VERSION("0.0.4");
+
+module_init(cqcam_init);
+module_exit(cqcam_cleanup);

Privacy Policy