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-rw-r--r--drivers/media/platform/vivi.c1409
1 files changed, 1409 insertions, 0 deletions
diff --git a/drivers/media/platform/vivi.c b/drivers/media/platform/vivi.c
new file mode 100644
index 000000000000..a6351c49bfd3
--- /dev/null
+++ b/drivers/media/platform/vivi.c
@@ -0,0 +1,1409 @@
+/*
+ * Virtual Video driver - This code emulates a real video device with v4l2 api
+ *
+ * Copyright (c) 2006 by:
+ * Mauro Carvalho Chehab <mchehab--a.t--infradead.org>
+ * Ted Walther <ted--a.t--enumera.com>
+ * John Sokol <sokol--a.t--videotechnology.com>
+ * http://v4l.videotechnology.com/
+ *
+ * Conversion to videobuf2 by Pawel Osciak & Marek Szyprowski
+ * Copyright (c) 2010 Samsung Electronics
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the BSD Licence, GNU General Public License
+ * as published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version
+ */
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/font.h>
+#include <linux/mutex.h>
+#include <linux/videodev2.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <media/videobuf2-vmalloc.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-common.h>
+
+#define VIVI_MODULE_NAME "vivi"
+
+/* Wake up at about 30 fps */
+#define WAKE_NUMERATOR 30
+#define WAKE_DENOMINATOR 1001
+#define BUFFER_TIMEOUT msecs_to_jiffies(500) /* 0.5 seconds */
+
+#define MAX_WIDTH 1920
+#define MAX_HEIGHT 1200
+
+#define VIVI_VERSION "0.8.1"
+
+MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
+MODULE_AUTHOR("Mauro Carvalho Chehab, Ted Walther and John Sokol");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_VERSION(VIVI_VERSION);
+
+static unsigned video_nr = -1;
+module_param(video_nr, uint, 0644);
+MODULE_PARM_DESC(video_nr, "videoX start number, -1 is autodetect");
+
+static unsigned n_devs = 1;
+module_param(n_devs, uint, 0644);
+MODULE_PARM_DESC(n_devs, "number of video devices to create");
+
+static unsigned debug;
+module_param(debug, uint, 0644);
+MODULE_PARM_DESC(debug, "activates debug info");
+
+static unsigned int vid_limit = 16;
+module_param(vid_limit, uint, 0644);
+MODULE_PARM_DESC(vid_limit, "capture memory limit in megabytes");
+
+/* Global font descriptor */
+static const u8 *font8x16;
+
+#define dprintk(dev, level, fmt, arg...) \
+ v4l2_dbg(level, debug, &dev->v4l2_dev, fmt, ## arg)
+
+/* ------------------------------------------------------------------
+ Basic structures
+ ------------------------------------------------------------------*/
+
+struct vivi_fmt {
+ char *name;
+ u32 fourcc; /* v4l2 format id */
+ u8 depth;
+ bool is_yuv;
+};
+
+static struct vivi_fmt formats[] = {
+ {
+ .name = "4:2:2, packed, YUYV",
+ .fourcc = V4L2_PIX_FMT_YUYV,
+ .depth = 16,
+ .is_yuv = true,
+ },
+ {
+ .name = "4:2:2, packed, UYVY",
+ .fourcc = V4L2_PIX_FMT_UYVY,
+ .depth = 16,
+ .is_yuv = true,
+ },
+ {
+ .name = "4:2:2, packed, YVYU",
+ .fourcc = V4L2_PIX_FMT_YVYU,
+ .depth = 16,
+ .is_yuv = true,
+ },
+ {
+ .name = "4:2:2, packed, VYUY",
+ .fourcc = V4L2_PIX_FMT_VYUY,
+ .depth = 16,
+ .is_yuv = true,
+ },
+ {
+ .name = "RGB565 (LE)",
+ .fourcc = V4L2_PIX_FMT_RGB565, /* gggbbbbb rrrrrggg */
+ .depth = 16,
+ },
+ {
+ .name = "RGB565 (BE)",
+ .fourcc = V4L2_PIX_FMT_RGB565X, /* rrrrrggg gggbbbbb */
+ .depth = 16,
+ },
+ {
+ .name = "RGB555 (LE)",
+ .fourcc = V4L2_PIX_FMT_RGB555, /* gggbbbbb arrrrrgg */
+ .depth = 16,
+ },
+ {
+ .name = "RGB555 (BE)",
+ .fourcc = V4L2_PIX_FMT_RGB555X, /* arrrrrgg gggbbbbb */
+ .depth = 16,
+ },
+ {
+ .name = "RGB24 (LE)",
+ .fourcc = V4L2_PIX_FMT_RGB24, /* rgb */
+ .depth = 24,
+ },
+ {
+ .name = "RGB24 (BE)",
+ .fourcc = V4L2_PIX_FMT_BGR24, /* bgr */
+ .depth = 24,
+ },
+ {
+ .name = "RGB32 (LE)",
+ .fourcc = V4L2_PIX_FMT_RGB32, /* argb */
+ .depth = 32,
+ },
+ {
+ .name = "RGB32 (BE)",
+ .fourcc = V4L2_PIX_FMT_BGR32, /* bgra */
+ .depth = 32,
+ },
+};
+
+static struct vivi_fmt *get_format(struct v4l2_format *f)
+{
+ struct vivi_fmt *fmt;
+ unsigned int k;
+
+ for (k = 0; k < ARRAY_SIZE(formats); k++) {
+ fmt = &formats[k];
+ if (fmt->fourcc == f->fmt.pix.pixelformat)
+ break;
+ }
+
+ if (k == ARRAY_SIZE(formats))
+ return NULL;
+
+ return &formats[k];
+}
+
+/* buffer for one video frame */
+struct vivi_buffer {
+ /* common v4l buffer stuff -- must be first */
+ struct vb2_buffer vb;
+ struct list_head list;
+ struct vivi_fmt *fmt;
+};
+
+struct vivi_dmaqueue {
+ struct list_head active;
+
+ /* thread for generating video stream*/
+ struct task_struct *kthread;
+ wait_queue_head_t wq;
+ /* Counters to control fps rate */
+ int frame;
+ int ini_jiffies;
+};
+
+static LIST_HEAD(vivi_devlist);
+
+struct vivi_dev {
+ struct list_head vivi_devlist;
+ struct v4l2_device v4l2_dev;
+ struct v4l2_ctrl_handler ctrl_handler;
+ struct video_device vdev;
+
+ /* controls */
+ struct v4l2_ctrl *brightness;
+ struct v4l2_ctrl *contrast;
+ struct v4l2_ctrl *saturation;
+ struct v4l2_ctrl *hue;
+ struct {
+ /* autogain/gain cluster */
+ struct v4l2_ctrl *autogain;
+ struct v4l2_ctrl *gain;
+ };
+ struct v4l2_ctrl *volume;
+ struct v4l2_ctrl *alpha;
+ struct v4l2_ctrl *button;
+ struct v4l2_ctrl *boolean;
+ struct v4l2_ctrl *int32;
+ struct v4l2_ctrl *int64;
+ struct v4l2_ctrl *menu;
+ struct v4l2_ctrl *string;
+ struct v4l2_ctrl *bitmask;
+ struct v4l2_ctrl *int_menu;
+
+ spinlock_t slock;
+ struct mutex mutex;
+
+ struct vivi_dmaqueue vidq;
+
+ /* Several counters */
+ unsigned ms;
+ unsigned long jiffies;
+ unsigned button_pressed;
+
+ int mv_count; /* Controls bars movement */
+
+ /* Input Number */
+ int input;
+
+ /* video capture */
+ struct vivi_fmt *fmt;
+ unsigned int width, height;
+ struct vb2_queue vb_vidq;
+ unsigned int field_count;
+
+ u8 bars[9][3];
+ u8 line[MAX_WIDTH * 8];
+ unsigned int pixelsize;
+ u8 alpha_component;
+};
+
+/* ------------------------------------------------------------------
+ DMA and thread functions
+ ------------------------------------------------------------------*/
+
+/* Bars and Colors should match positions */
+
+enum colors {
+ WHITE,
+ AMBER,
+ CYAN,
+ GREEN,
+ MAGENTA,
+ RED,
+ BLUE,
+ BLACK,
+ TEXT_BLACK,
+};
+
+/* R G B */
+#define COLOR_WHITE {204, 204, 204}
+#define COLOR_AMBER {208, 208, 0}
+#define COLOR_CYAN { 0, 206, 206}
+#define COLOR_GREEN { 0, 239, 0}
+#define COLOR_MAGENTA {239, 0, 239}
+#define COLOR_RED {205, 0, 0}
+#define COLOR_BLUE { 0, 0, 255}
+#define COLOR_BLACK { 0, 0, 0}
+
+struct bar_std {
+ u8 bar[9][3];
+};
+
+/* Maximum number of bars are 10 - otherwise, the input print code
+ should be modified */
+static struct bar_std bars[] = {
+ { /* Standard ITU-R color bar sequence */
+ { COLOR_WHITE, COLOR_AMBER, COLOR_CYAN, COLOR_GREEN,
+ COLOR_MAGENTA, COLOR_RED, COLOR_BLUE, COLOR_BLACK, COLOR_BLACK }
+ }, {
+ { COLOR_WHITE, COLOR_AMBER, COLOR_BLACK, COLOR_WHITE,
+ COLOR_AMBER, COLOR_BLACK, COLOR_WHITE, COLOR_AMBER, COLOR_BLACK }
+ }, {
+ { COLOR_WHITE, COLOR_CYAN, COLOR_BLACK, COLOR_WHITE,
+ COLOR_CYAN, COLOR_BLACK, COLOR_WHITE, COLOR_CYAN, COLOR_BLACK }
+ }, {
+ { COLOR_WHITE, COLOR_GREEN, COLOR_BLACK, COLOR_WHITE,
+ COLOR_GREEN, COLOR_BLACK, COLOR_WHITE, COLOR_GREEN, COLOR_BLACK }
+ },
+};
+
+#define NUM_INPUTS ARRAY_SIZE(bars)
+
+#define TO_Y(r, g, b) \
+ (((16829 * r + 33039 * g + 6416 * b + 32768) >> 16) + 16)
+/* RGB to V(Cr) Color transform */
+#define TO_V(r, g, b) \
+ (((28784 * r - 24103 * g - 4681 * b + 32768) >> 16) + 128)
+/* RGB to U(Cb) Color transform */
+#define TO_U(r, g, b) \
+ (((-9714 * r - 19070 * g + 28784 * b + 32768) >> 16) + 128)
+
+/* precalculate color bar values to speed up rendering */
+static void precalculate_bars(struct vivi_dev *dev)
+{
+ u8 r, g, b;
+ int k, is_yuv;
+
+ for (k = 0; k < 9; k++) {
+ r = bars[dev->input].bar[k][0];
+ g = bars[dev->input].bar[k][1];
+ b = bars[dev->input].bar[k][2];
+ is_yuv = dev->fmt->is_yuv;
+
+ switch (dev->fmt->fourcc) {
+ case V4L2_PIX_FMT_RGB565:
+ case V4L2_PIX_FMT_RGB565X:
+ r >>= 3;
+ g >>= 2;
+ b >>= 3;
+ break;
+ case V4L2_PIX_FMT_RGB555:
+ case V4L2_PIX_FMT_RGB555X:
+ r >>= 3;
+ g >>= 3;
+ b >>= 3;
+ break;
+ case V4L2_PIX_FMT_YUYV:
+ case V4L2_PIX_FMT_UYVY:
+ case V4L2_PIX_FMT_YVYU:
+ case V4L2_PIX_FMT_VYUY:
+ case V4L2_PIX_FMT_RGB24:
+ case V4L2_PIX_FMT_BGR24:
+ case V4L2_PIX_FMT_RGB32:
+ case V4L2_PIX_FMT_BGR32:
+ break;
+ }
+
+ if (is_yuv) {
+ dev->bars[k][0] = TO_Y(r, g, b); /* Luma */
+ dev->bars[k][1] = TO_U(r, g, b); /* Cb */
+ dev->bars[k][2] = TO_V(r, g, b); /* Cr */
+ } else {
+ dev->bars[k][0] = r;
+ dev->bars[k][1] = g;
+ dev->bars[k][2] = b;
+ }
+ }
+}
+
+#define TSTAMP_MIN_Y 24
+#define TSTAMP_MAX_Y (TSTAMP_MIN_Y + 15)
+#define TSTAMP_INPUT_X 10
+#define TSTAMP_MIN_X (54 + TSTAMP_INPUT_X)
+
+/* 'odd' is true for pixels 1, 3, 5, etc. and false for pixels 0, 2, 4, etc. */
+static void gen_twopix(struct vivi_dev *dev, u8 *buf, int colorpos, bool odd)
+{
+ u8 r_y, g_u, b_v;
+ u8 alpha = dev->alpha_component;
+ int color;
+ u8 *p;
+
+ r_y = dev->bars[colorpos][0]; /* R or precalculated Y */
+ g_u = dev->bars[colorpos][1]; /* G or precalculated U */
+ b_v = dev->bars[colorpos][2]; /* B or precalculated V */
+
+ for (color = 0; color < dev->pixelsize; color++) {
+ p = buf + color;
+
+ switch (dev->fmt->fourcc) {
+ case V4L2_PIX_FMT_YUYV:
+ switch (color) {
+ case 0:
+ *p = r_y;
+ break;
+ case 1:
+ *p = odd ? b_v : g_u;
+ break;
+ }
+ break;
+ case V4L2_PIX_FMT_UYVY:
+ switch (color) {
+ case 0:
+ *p = odd ? b_v : g_u;
+ break;
+ case 1:
+ *p = r_y;
+ break;
+ }
+ break;
+ case V4L2_PIX_FMT_YVYU:
+ switch (color) {
+ case 0:
+ *p = r_y;
+ break;
+ case 1:
+ *p = odd ? g_u : b_v;
+ break;
+ }
+ break;
+ case V4L2_PIX_FMT_VYUY:
+ switch (color) {
+ case 0:
+ *p = odd ? g_u : b_v;
+ break;
+ case 1:
+ *p = r_y;
+ break;
+ }
+ break;
+ case V4L2_PIX_FMT_RGB565:
+ switch (color) {
+ case 0:
+ *p = (g_u << 5) | b_v;
+ break;
+ case 1:
+ *p = (r_y << 3) | (g_u >> 3);
+ break;
+ }
+ break;
+ case V4L2_PIX_FMT_RGB565X:
+ switch (color) {
+ case 0:
+ *p = (r_y << 3) | (g_u >> 3);
+ break;
+ case 1:
+ *p = (g_u << 5) | b_v;
+ break;
+ }
+ break;
+ case V4L2_PIX_FMT_RGB555:
+ switch (color) {
+ case 0:
+ *p = (g_u << 5) | b_v;
+ break;
+ case 1:
+ *p = (alpha & 0x80) | (r_y << 2) | (g_u >> 3);
+ break;
+ }
+ break;
+ case V4L2_PIX_FMT_RGB555X:
+ switch (color) {
+ case 0:
+ *p = (alpha & 0x80) | (r_y << 2) | (g_u >> 3);
+ break;
+ case 1:
+ *p = (g_u << 5) | b_v;
+ break;
+ }
+ break;
+ case V4L2_PIX_FMT_RGB24:
+ switch (color) {
+ case 0:
+ *p = r_y;
+ break;
+ case 1:
+ *p = g_u;
+ break;
+ case 2:
+ *p = b_v;
+ break;
+ }
+ break;
+ case V4L2_PIX_FMT_BGR24:
+ switch (color) {
+ case 0:
+ *p = b_v;
+ break;
+ case 1:
+ *p = g_u;
+ break;
+ case 2:
+ *p = r_y;
+ break;
+ }
+ break;
+ case V4L2_PIX_FMT_RGB32:
+ switch (color) {
+ case 0:
+ *p = alpha;
+ break;
+ case 1:
+ *p = r_y;
+ break;
+ case 2:
+ *p = g_u;
+ break;
+ case 3:
+ *p = b_v;
+ break;
+ }
+ break;
+ case V4L2_PIX_FMT_BGR32:
+ switch (color) {
+ case 0:
+ *p = b_v;
+ break;
+ case 1:
+ *p = g_u;
+ break;
+ case 2:
+ *p = r_y;
+ break;
+ case 3:
+ *p = alpha;
+ break;
+ }
+ break;
+ }
+ }
+}
+
+static void precalculate_line(struct vivi_dev *dev)
+{
+ int w;
+
+ for (w = 0; w < dev->width * 2; w++) {
+ int colorpos = w / (dev->width / 8) % 8;
+
+ gen_twopix(dev, dev->line + w * dev->pixelsize, colorpos, w & 1);
+ }
+}
+
+static void gen_text(struct vivi_dev *dev, char *basep,
+ int y, int x, char *text)
+{
+ int line;
+
+ /* Checks if it is possible to show string */
+ if (y + 16 >= dev->height || x + strlen(text) * 8 >= dev->width)
+ return;
+
+ /* Print stream time */
+ for (line = y; line < y + 16; line++) {
+ int j = 0;
+ char *pos = basep + line * dev->width * dev->pixelsize + x * dev->pixelsize;
+ char *s;
+
+ for (s = text; *s; s++) {
+ u8 chr = font8x16[*s * 16 + line - y];
+ int i;
+
+ for (i = 0; i < 7; i++, j++) {
+ /* Draw white font on black background */
+ if (chr & (1 << (7 - i)))
+ gen_twopix(dev, pos + j * dev->pixelsize, WHITE, (x+y) & 1);
+ else
+ gen_twopix(dev, pos + j * dev->pixelsize, TEXT_BLACK, (x+y) & 1);
+ }
+ }
+ }
+}
+
+static void vivi_fillbuff(struct vivi_dev *dev, struct vivi_buffer *buf)
+{
+ int wmax = dev->width;
+ int hmax = dev->height;
+ struct timeval ts;
+ void *vbuf = vb2_plane_vaddr(&buf->vb, 0);
+ unsigned ms;
+ char str[100];
+ int h, line = 1;
+ s32 gain;
+
+ if (!vbuf)
+ return;
+
+ for (h = 0; h < hmax; h++)
+ memcpy(vbuf + h * wmax * dev->pixelsize,
+ dev->line + (dev->mv_count % wmax) * dev->pixelsize,
+ wmax * dev->pixelsize);
+
+ /* Updates stream time */
+
+ dev->ms += jiffies_to_msecs(jiffies - dev->jiffies);
+ dev->jiffies = jiffies;
+ ms = dev->ms;
+ snprintf(str, sizeof(str), " %02d:%02d:%02d:%03d ",
+ (ms / (60 * 60 * 1000)) % 24,
+ (ms / (60 * 1000)) % 60,
+ (ms / 1000) % 60,
+ ms % 1000);
+ gen_text(dev, vbuf, line++ * 16, 16, str);
+ snprintf(str, sizeof(str), " %dx%d, input %d ",
+ dev->width, dev->height, dev->input);
+ gen_text(dev, vbuf, line++ * 16, 16, str);
+
+ gain = v4l2_ctrl_g_ctrl(dev->gain);
+ mutex_lock(dev->ctrl_handler.lock);
+ snprintf(str, sizeof(str), " brightness %3d, contrast %3d, saturation %3d, hue %d ",
+ dev->brightness->cur.val,
+ dev->contrast->cur.val,
+ dev->saturation->cur.val,
+ dev->hue->cur.val);
+ gen_text(dev, vbuf, line++ * 16, 16, str);
+ snprintf(str, sizeof(str), " autogain %d, gain %3d, volume %3d, alpha 0x%02x ",
+ dev->autogain->cur.val, gain, dev->volume->cur.val,
+ dev->alpha->cur.val);
+ gen_text(dev, vbuf, line++ * 16, 16, str);
+ snprintf(str, sizeof(str), " int32 %d, int64 %lld, bitmask %08x ",
+ dev->int32->cur.val,
+ dev->int64->cur.val64,
+ dev->bitmask->cur.val);
+ gen_text(dev, vbuf, line++ * 16, 16, str);
+ snprintf(str, sizeof(str), " boolean %d, menu %s, string \"%s\" ",
+ dev->boolean->cur.val,
+ dev->menu->qmenu[dev->menu->cur.val],
+ dev->string->cur.string);
+ gen_text(dev, vbuf, line++ * 16, 16, str);
+ snprintf(str, sizeof(str), " integer_menu %lld, value %d ",
+ dev->int_menu->qmenu_int[dev->int_menu->cur.val],
+ dev->int_menu->cur.val);
+ gen_text(dev, vbuf, line++ * 16, 16, str);
+ mutex_unlock(dev->ctrl_handler.lock);
+ if (dev->button_pressed) {
+ dev->button_pressed--;
+ snprintf(str, sizeof(str), " button pressed!");
+ gen_text(dev, vbuf, line++ * 16, 16, str);
+ }
+
+ dev->mv_count += 2;
+
+ buf->vb.v4l2_buf.field = V4L2_FIELD_INTERLACED;
+ dev->field_count++;
+ buf->vb.v4l2_buf.sequence = dev->field_count >> 1;
+ do_gettimeofday(&ts);
+ buf->vb.v4l2_buf.timestamp = ts;
+}
+
+static void vivi_thread_tick(struct vivi_dev *dev)
+{
+ struct vivi_dmaqueue *dma_q = &dev->vidq;
+ struct vivi_buffer *buf;
+ unsigned long flags = 0;
+
+ dprintk(dev, 1, "Thread tick\n");
+
+ spin_lock_irqsave(&dev->slock, flags);
+ if (list_empty(&dma_q->active)) {
+ dprintk(dev, 1, "No active queue to serve\n");
+ spin_unlock_irqrestore(&dev->slock, flags);
+ return;
+ }
+
+ buf = list_entry(dma_q->active.next, struct vivi_buffer, list);
+ list_del(&buf->list);
+ spin_unlock_irqrestore(&dev->slock, flags);
+
+ do_gettimeofday(&buf->vb.v4l2_buf.timestamp);
+
+ /* Fill buffer */
+ vivi_fillbuff(dev, buf);
+ dprintk(dev, 1, "filled buffer %p\n", buf);
+
+ vb2_buffer_done(&buf->vb, VB2_BUF_STATE_DONE);
+ dprintk(dev, 2, "[%p/%d] done\n", buf, buf->vb.v4l2_buf.index);
+}
+
+#define frames_to_ms(frames) \
+ ((frames * WAKE_NUMERATOR * 1000) / WAKE_DENOMINATOR)
+
+static void vivi_sleep(struct vivi_dev *dev)
+{
+ struct vivi_dmaqueue *dma_q = &dev->vidq;
+ int timeout;
+ DECLARE_WAITQUEUE(wait, current);
+
+ dprintk(dev, 1, "%s dma_q=0x%08lx\n", __func__,
+ (unsigned long)dma_q);
+
+ add_wait_queue(&dma_q->wq, &wait);
+ if (kthread_should_stop())
+ goto stop_task;
+
+ /* Calculate time to wake up */
+ timeout = msecs_to_jiffies(frames_to_ms(1));
+
+ vivi_thread_tick(dev);
+
+ schedule_timeout_interruptible(timeout);
+
+stop_task:
+ remove_wait_queue(&dma_q->wq, &wait);
+ try_to_freeze();
+}
+
+static int vivi_thread(void *data)
+{
+ struct vivi_dev *dev = data;
+
+ dprintk(dev, 1, "thread started\n");
+
+ set_freezable();
+
+ for (;;) {
+ vivi_sleep(dev);
+
+ if (kthread_should_stop())
+ break;
+ }
+ dprintk(dev, 1, "thread: exit\n");
+ return 0;
+}
+
+static int vivi_start_generating(struct vivi_dev *dev)
+{
+ struct vivi_dmaqueue *dma_q = &dev->vidq;
+
+ dprintk(dev, 1, "%s\n", __func__);
+
+ /* Resets frame counters */
+ dev->ms = 0;
+ dev->mv_count = 0;
+ dev->jiffies = jiffies;
+
+ dma_q->frame = 0;
+ dma_q->ini_jiffies = jiffies;
+ dma_q->kthread = kthread_run(vivi_thread, dev, dev->v4l2_dev.name);
+
+ if (IS_ERR(dma_q->kthread)) {
+ v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
+ return PTR_ERR(dma_q->kthread);
+ }
+ /* Wakes thread */
+ wake_up_interruptible(&dma_q->wq);
+
+ dprintk(dev, 1, "returning from %s\n", __func__);
+ return 0;
+}
+
+static void vivi_stop_generating(struct vivi_dev *dev)
+{
+ struct vivi_dmaqueue *dma_q = &dev->vidq;
+
+ dprintk(dev, 1, "%s\n", __func__);
+
+ /* shutdown control thread */
+ if (dma_q->kthread) {
+ kthread_stop(dma_q->kthread);
+ dma_q->kthread = NULL;
+ }
+
+ /*
+ * Typical driver might need to wait here until dma engine stops.
+ * In this case we can abort imiedetly, so it's just a noop.
+ */
+
+ /* Release all active buffers */
+ while (!list_empty(&dma_q->active)) {
+ struct vivi_buffer *buf;
+ buf = list_entry(dma_q->active.next, struct vivi_buffer, list);
+ list_del(&buf->list);
+ vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
+ dprintk(dev, 2, "[%p/%d] done\n", buf, buf->vb.v4l2_buf.index);
+ }
+}
+/* ------------------------------------------------------------------
+ Videobuf operations
+ ------------------------------------------------------------------*/
+static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
+ unsigned int *nbuffers, unsigned int *nplanes,
+ unsigned int sizes[], void *alloc_ctxs[])
+{
+ struct vivi_dev *dev = vb2_get_drv_priv(vq);
+ unsigned long size;
+
+ if (fmt)
+ size = fmt->fmt.pix.sizeimage;
+ else
+ size = dev->width * dev->height * dev->pixelsize;
+
+ if (size == 0)
+ return -EINVAL;
+
+ if (0 == *nbuffers)
+ *nbuffers = 32;
+
+ while (size * *nbuffers > vid_limit * 1024 * 1024)
+ (*nbuffers)--;
+
+ *nplanes = 1;
+
+ sizes[0] = size;
+
+ /*
+ * videobuf2-vmalloc allocator is context-less so no need to set
+ * alloc_ctxs array.
+ */
+
+ dprintk(dev, 1, "%s, count=%d, size=%ld\n", __func__,
+ *nbuffers, size);
+
+ return 0;
+}
+
+static int buffer_prepare(struct vb2_buffer *vb)
+{
+ struct vivi_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
+ struct vivi_buffer *buf = container_of(vb, struct vivi_buffer, vb);
+ unsigned long size;
+
+ dprintk(dev, 1, "%s, field=%d\n", __func__, vb->v4l2_buf.field);
+
+ BUG_ON(NULL == dev->fmt);
+
+ /*
+ * Theses properties only change when queue is idle, see s_fmt.
+ * The below checks should not be performed here, on each
+ * buffer_prepare (i.e. on each qbuf). Most of the code in this function
+ * should thus be moved to buffer_init and s_fmt.
+ */
+ if (dev->width < 48 || dev->width > MAX_WIDTH ||
+ dev->height < 32 || dev->height > MAX_HEIGHT)
+ return -EINVAL;
+
+ size = dev->width * dev->height * dev->pixelsize;
+ if (vb2_plane_size(vb, 0) < size) {
+ dprintk(dev, 1, "%s data will not fit into plane (%lu < %lu)\n",
+ __func__, vb2_plane_size(vb, 0), size);
+ return -EINVAL;
+ }
+
+ vb2_set_plane_payload(&buf->vb, 0, size);
+
+ buf->fmt = dev->fmt;
+
+ precalculate_bars(dev);
+ precalculate_line(dev);
+
+ return 0;
+}
+
+static void buffer_queue(struct vb2_buffer *vb)
+{
+ struct vivi_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
+ struct vivi_buffer *buf = container_of(vb, struct vivi_buffer, vb);
+ struct vivi_dmaqueue *vidq = &dev->vidq;
+ unsigned long flags = 0;
+
+ dprintk(dev, 1, "%s\n", __func__);
+
+ spin_lock_irqsave(&dev->slock, flags);
+ list_add_tail(&buf->list, &vidq->active);
+ spin_unlock_irqrestore(&dev->slock, flags);
+}
+
+static int start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+ struct vivi_dev *dev = vb2_get_drv_priv(vq);
+ dprintk(dev, 1, "%s\n", __func__);
+ return vivi_start_generating(dev);
+}
+
+/* abort streaming and wait for last buffer */
+static int stop_streaming(struct vb2_queue *vq)
+{
+ struct vivi_dev *dev = vb2_get_drv_priv(vq);
+ dprintk(dev, 1, "%s\n", __func__);
+ vivi_stop_generating(dev);
+ return 0;
+}
+
+static void vivi_lock(struct vb2_queue *vq)
+{
+ struct vivi_dev *dev = vb2_get_drv_priv(vq);
+ mutex_lock(&dev->mutex);
+}
+
+static void vivi_unlock(struct vb2_queue *vq)
+{
+ struct vivi_dev *dev = vb2_get_drv_priv(vq);
+ mutex_unlock(&dev->mutex);
+}
+
+
+static struct vb2_ops vivi_video_qops = {
+ .queue_setup = queue_setup,
+ .buf_prepare = buffer_prepare,
+ .buf_queue = buffer_queue,
+ .start_streaming = start_streaming,
+ .stop_streaming = stop_streaming,
+ .wait_prepare = vivi_unlock,
+ .wait_finish = vivi_lock,
+};
+
+/* ------------------------------------------------------------------
+ IOCTL vidioc handling
+ ------------------------------------------------------------------*/
+static int vidioc_querycap(struct file *file, void *priv,
+ struct v4l2_capability *cap)
+{
+ struct vivi_dev *dev = video_drvdata(file);
+
+ strcpy(cap->driver, "vivi");
+ strcpy(cap->card, "vivi");
+ strlcpy(cap->bus_info, dev->v4l2_dev.name, sizeof(cap->bus_info));
+ cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
+ V4L2_CAP_READWRITE;
+ cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
+ return 0;
+}
+
+static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_fmtdesc *f)
+{
+ struct vivi_fmt *fmt;
+
+ if (f->index >= ARRAY_SIZE(formats))
+ return -EINVAL;
+
+ fmt = &formats[f->index];
+
+ strlcpy(f->description, fmt->name, sizeof(f->description));
+ f->pixelformat = fmt->fourcc;
+ return 0;
+}
+
+static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct vivi_dev *dev = video_drvdata(file);
+
+ f->fmt.pix.width = dev->width;
+ f->fmt.pix.height = dev->height;
+ f->fmt.pix.field = V4L2_FIELD_INTERLACED;
+ f->fmt.pix.pixelformat = dev->fmt->fourcc;
+ f->fmt.pix.bytesperline =
+ (f->fmt.pix.width * dev->fmt->depth) >> 3;
+ f->fmt.pix.sizeimage =
+ f->fmt.pix.height * f->fmt.pix.bytesperline;
+ if (dev->fmt->is_yuv)
+ f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+ else
+ f->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
+ return 0;
+}
+
+static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct vivi_dev *dev = video_drvdata(file);
+ struct vivi_fmt *fmt;
+
+ fmt = get_format(f);
+ if (!fmt) {
+ dprintk(dev, 1, "Fourcc format (0x%08x) unknown.\n",
+ f->fmt.pix.pixelformat);
+ f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
+ fmt = get_format(f);
+ }
+
+ f->fmt.pix.field = V4L2_FIELD_INTERLACED;
+ v4l_bound_align_image(&f->fmt.pix.width, 48, MAX_WIDTH, 2,
+ &f->fmt.pix.height, 32, MAX_HEIGHT, 0, 0);
+ f->fmt.pix.bytesperline =
+ (f->fmt.pix.width * fmt->depth) >> 3;
+ f->fmt.pix.sizeimage =
+ f->fmt.pix.height * f->fmt.pix.bytesperline;
+ if (fmt->is_yuv)
+ f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+ else
+ f->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
+ f->fmt.pix.priv = 0;
+ return 0;
+}
+
+static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct vivi_dev *dev = video_drvdata(file);
+ struct vb2_queue *q = &dev->vb_vidq;
+
+ int ret = vidioc_try_fmt_vid_cap(file, priv, f);
+ if (ret < 0)
+ return ret;
+
+ if (vb2_is_busy(q)) {
+ dprintk(dev, 1, "%s device busy\n", __func__);
+ return -EBUSY;
+ }
+
+ dev->fmt = get_format(f);
+ dev->pixelsize = dev->fmt->depth / 8;
+ dev->width = f->fmt.pix.width;
+ dev->height = f->fmt.pix.height;
+
+ return 0;
+}
+
+static int vidioc_enum_framesizes(struct file *file, void *fh,
+ struct v4l2_frmsizeenum *fsize)
+{
+ static const struct v4l2_frmsize_stepwise sizes = {
+ 48, MAX_WIDTH, 4,
+ 32, MAX_HEIGHT, 1
+ };
+ int i;
+
+ if (fsize->index)
+ return -EINVAL;
+ for (i = 0; i < ARRAY_SIZE(formats); i++)
+ if (formats[i].fourcc == fsize->pixel_format)
+ break;
+ if (i == ARRAY_SIZE(formats))
+ return -EINVAL;
+ fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
+ fsize->stepwise = sizes;
+ return 0;
+}
+
+/* only one input in this sample driver */
+static int vidioc_enum_input(struct file *file, void *priv,
+ struct v4l2_input *inp)
+{
+ if (inp->index >= NUM_INPUTS)
+ return -EINVAL;
+
+ inp->type = V4L2_INPUT_TYPE_CAMERA;
+ sprintf(inp->name, "Camera %u", inp->index);
+ return 0;
+}
+
+static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
+{
+ struct vivi_dev *dev = video_drvdata(file);
+
+ *i = dev->input;
+ return 0;
+}
+
+static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
+{
+ struct vivi_dev *dev = video_drvdata(file);
+
+ if (i >= NUM_INPUTS)
+ return -EINVAL;
+
+ if (i == dev->input)
+ return 0;
+
+ dev->input = i;
+ precalculate_bars(dev);
+ precalculate_line(dev);
+ return 0;
+}
+
+/* --- controls ---------------------------------------------- */
+
+static int vivi_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct vivi_dev *dev = container_of(ctrl->handler, struct vivi_dev, ctrl_handler);
+
+ if (ctrl == dev->autogain)
+ dev->gain->val = jiffies & 0xff;
+ return 0;
+}
+
+static int vivi_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct vivi_dev *dev = container_of(ctrl->handler, struct vivi_dev, ctrl_handler);
+
+ switch (ctrl->id) {
+ case V4L2_CID_ALPHA_COMPONENT:
+ dev->alpha_component = ctrl->val;
+ break;
+ default:
+ if (ctrl == dev->button)
+ dev->button_pressed = 30;
+ break;
+ }
+ return 0;
+}
+
+/* ------------------------------------------------------------------
+ File operations for the device
+ ------------------------------------------------------------------*/
+
+static const struct v4l2_ctrl_ops vivi_ctrl_ops = {
+ .g_volatile_ctrl = vivi_g_volatile_ctrl,
+ .s_ctrl = vivi_s_ctrl,
+};
+
+#define VIVI_CID_CUSTOM_BASE (V4L2_CID_USER_BASE | 0xf000)
+
+static const struct v4l2_ctrl_config vivi_ctrl_button = {
+ .ops = &vivi_ctrl_ops,
+ .id = VIVI_CID_CUSTOM_BASE + 0,
+ .name = "Button",
+ .type = V4L2_CTRL_TYPE_BUTTON,
+};
+
+static const struct v4l2_ctrl_config vivi_ctrl_boolean = {
+ .ops = &vivi_ctrl_ops,
+ .id = VIVI_CID_CUSTOM_BASE + 1,
+ .name = "Boolean",
+ .type = V4L2_CTRL_TYPE_BOOLEAN,
+ .min = 0,
+ .max = 1,
+ .step = 1,
+ .def = 1,
+};
+
+static const struct v4l2_ctrl_config vivi_ctrl_int32 = {
+ .ops = &vivi_ctrl_ops,
+ .id = VIVI_CID_CUSTOM_BASE + 2,
+ .name = "Integer 32 Bits",
+ .type = V4L2_CTRL_TYPE_INTEGER,
+ .min = 0x80000000,
+ .max = 0x7fffffff,
+ .step = 1,
+};
+
+static const struct v4l2_ctrl_config vivi_ctrl_int64 = {
+ .ops = &vivi_ctrl_ops,
+ .id = VIVI_CID_CUSTOM_BASE + 3,
+ .name = "Integer 64 Bits",
+ .type = V4L2_CTRL_TYPE_INTEGER64,
+};
+
+static const char * const vivi_ctrl_menu_strings[] = {
+ "Menu Item 0 (Skipped)",
+ "Menu Item 1",
+ "Menu Item 2 (Skipped)",
+ "Menu Item 3",
+ "Menu Item 4",
+ "Menu Item 5 (Skipped)",
+ NULL,
+};
+
+static const struct v4l2_ctrl_config vivi_ctrl_menu = {
+ .ops = &vivi_ctrl_ops,
+ .id = VIVI_CID_CUSTOM_BASE + 4,
+ .name = "Menu",
+ .type = V4L2_CTRL_TYPE_MENU,
+ .min = 1,
+ .max = 4,
+ .def = 3,
+ .menu_skip_mask = 0x04,
+ .qmenu = vivi_ctrl_menu_strings,
+};
+
+static const struct v4l2_ctrl_config vivi_ctrl_string = {
+ .ops = &vivi_ctrl_ops,
+ .id = VIVI_CID_CUSTOM_BASE + 5,
+ .name = "String",
+ .type = V4L2_CTRL_TYPE_STRING,
+ .min = 2,
+ .max = 4,
+ .step = 1,
+};
+
+static const struct v4l2_ctrl_config vivi_ctrl_bitmask = {
+ .ops = &vivi_ctrl_ops,
+ .id = VIVI_CID_CUSTOM_BASE + 6,
+ .name = "Bitmask",
+ .type = V4L2_CTRL_TYPE_BITMASK,
+ .def = 0x80002000,
+ .min = 0,
+ .max = 0x80402010,
+ .step = 0,
+};
+
+static const s64 vivi_ctrl_int_menu_values[] = {
+ 1, 1, 2, 3, 5, 8, 13, 21, 42,
+};
+
+static const struct v4l2_ctrl_config vivi_ctrl_int_menu = {
+ .ops = &vivi_ctrl_ops,
+ .id = VIVI_CID_CUSTOM_BASE + 7,
+ .name = "Integer menu",
+ .type = V4L2_CTRL_TYPE_INTEGER_MENU,
+ .min = 1,
+ .max = 8,
+ .def = 4,
+ .menu_skip_mask = 0x02,
+ .qmenu_int = vivi_ctrl_int_menu_values,
+};
+
+static const struct v4l2_file_operations vivi_fops = {
+ .owner = THIS_MODULE,
+ .open = v4l2_fh_open,
+ .release = vb2_fop_release,
+ .read = vb2_fop_read,
+ .poll = vb2_fop_poll,
+ .unlocked_ioctl = video_ioctl2, /* V4L2 ioctl handler */
+ .mmap = vb2_fop_mmap,
+};
+
+static const struct v4l2_ioctl_ops vivi_ioctl_ops = {
+ .vidioc_querycap = vidioc_querycap,
+ .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
+ .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
+ .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
+ .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
+ .vidioc_enum_framesizes = vidioc_enum_framesizes,
+ .vidioc_reqbufs = vb2_ioctl_reqbufs,
+ .vidioc_create_bufs = vb2_ioctl_create_bufs,
+ .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+ .vidioc_querybuf = vb2_ioctl_querybuf,
+ .vidioc_qbuf = vb2_ioctl_qbuf,
+ .vidioc_dqbuf = vb2_ioctl_dqbuf,
+ .vidioc_enum_input = vidioc_enum_input,
+ .vidioc_g_input = vidioc_g_input,
+ .vidioc_s_input = vidioc_s_input,
+ .vidioc_streamon = vb2_ioctl_streamon,
+ .vidioc_streamoff = vb2_ioctl_streamoff,
+ .vidioc_log_status = v4l2_ctrl_log_status,
+ .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
+ .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+};
+
+static struct video_device vivi_template = {
+ .name = "vivi",
+ .fops = &vivi_fops,
+ .ioctl_ops = &vivi_ioctl_ops,
+ .release = video_device_release_empty,
+};
+
+/* -----------------------------------------------------------------
+ Initialization and module stuff
+ ------------------------------------------------------------------*/
+
+static int vivi_release(void)
+{
+ struct vivi_dev *dev;
+ struct list_head *list;
+
+ while (!list_empty(&vivi_devlist)) {
+ list = vivi_devlist.next;
+ list_del(list);
+ dev = list_entry(list, struct vivi_dev, vivi_devlist);
+
+ v4l2_info(&dev->v4l2_dev, "unregistering %s\n",
+ video_device_node_name(&dev->vdev));
+ video_unregister_device(&dev->vdev);
+ v4l2_device_unregister(&dev->v4l2_dev);
+ v4l2_ctrl_handler_free(&dev->ctrl_handler);
+ kfree(dev);
+ }
+
+ return 0;
+}
+
+static int __init vivi_create_instance(int inst)
+{
+ struct vivi_dev *dev;
+ struct video_device *vfd;
+ struct v4l2_ctrl_handler *hdl;
+ struct vb2_queue *q;
+ int ret;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ snprintf(dev->v4l2_dev.name, sizeof(dev->v4l2_dev.name),
+ "%s-%03d", VIVI_MODULE_NAME, inst);
+ ret = v4l2_device_register(NULL, &dev->v4l2_dev);
+ if (ret)
+ goto free_dev;
+
+ dev->fmt = &formats[0];
+ dev->width = 640;
+ dev->height = 480;
+ dev->pixelsize = dev->fmt->depth / 8;
+ hdl = &dev->ctrl_handler;
+ v4l2_ctrl_handler_init(hdl, 11);
+ dev->volume = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
+ V4L2_CID_AUDIO_VOLUME, 0, 255, 1, 200);
+ dev->brightness = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
+ V4L2_CID_BRIGHTNESS, 0, 255, 1, 127);
+ dev->contrast = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
+ V4L2_CID_CONTRAST, 0, 255, 1, 16);
+ dev->saturation = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
+ V4L2_CID_SATURATION, 0, 255, 1, 127);
+ dev->hue = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
+ V4L2_CID_HUE, -128, 127, 1, 0);
+ dev->autogain = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
+ V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
+ dev->gain = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
+ V4L2_CID_GAIN, 0, 255, 1, 100);
+ dev->alpha = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
+ V4L2_CID_ALPHA_COMPONENT, 0, 255, 1, 0);
+ dev->button = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_button, NULL);
+ dev->int32 = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_int32, NULL);
+ dev->int64 = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_int64, NULL);
+ dev->boolean = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_boolean, NULL);
+ dev->menu = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_menu, NULL);
+ dev->string = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_string, NULL);
+ dev->bitmask = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_bitmask, NULL);
+ dev->int_menu = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_int_menu, NULL);
+ if (hdl->error) {
+ ret = hdl->error;
+ goto unreg_dev;
+ }
+ v4l2_ctrl_auto_cluster(2, &dev->autogain, 0, true);
+ dev->v4l2_dev.ctrl_handler = hdl;
+
+ /* initialize locks */
+ spin_lock_init(&dev->slock);
+
+ /* initialize queue */
+ q = &dev->vb_vidq;
+ memset(q, 0, sizeof(dev->vb_vidq));
+ q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ;
+ q->drv_priv = dev;
+ q->buf_struct_size = sizeof(struct vivi_buffer);
+ q->ops = &vivi_video_qops;
+ q->mem_ops = &vb2_vmalloc_memops;
+
+ vb2_queue_init(q);
+
+ mutex_init(&dev->mutex);
+
+ /* init video dma queues */
+ INIT_LIST_HEAD(&dev->vidq.active);
+ init_waitqueue_head(&dev->vidq.wq);
+
+ vfd = &dev->vdev;
+ *vfd = vivi_template;
+ vfd->debug = debug;
+ vfd->v4l2_dev = &dev->v4l2_dev;
+ vfd->queue = q;
+ set_bit(V4L2_FL_USE_FH_PRIO, &vfd->flags);
+
+ /*
+ * Provide a mutex to v4l2 core. It will be used to protect
+ * all fops and v4l2 ioctls.
+ */
+ vfd->lock = &dev->mutex;
+ video_set_drvdata(vfd, dev);
+
+ ret = video_register_device(vfd, VFL_TYPE_GRABBER, video_nr);
+ if (ret < 0)
+ goto unreg_dev;
+
+ /* Now that everything is fine, let's add it to device list */
+ list_add_tail(&dev->vivi_devlist, &vivi_devlist);
+
+ v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
+ video_device_node_name(vfd));
+ return 0;
+
+unreg_dev:
+ v4l2_ctrl_handler_free(hdl);
+ v4l2_device_unregister(&dev->v4l2_dev);
+free_dev:
+ kfree(dev);
+ return ret;
+}
+
+/* This routine allocates from 1 to n_devs virtual drivers.
+
+ The real maximum number of virtual drivers will depend on how many drivers
+ will succeed. This is limited to the maximum number of devices that
+ videodev supports, which is equal to VIDEO_NUM_DEVICES.
+ */
+static int __init vivi_init(void)
+{
+ const struct font_desc *font = find_font("VGA8x16");
+ int ret = 0, i;
+
+ if (font == NULL) {
+ printk(KERN_ERR "vivi: could not find font\n");
+ return -ENODEV;
+ }
+ font8x16 = font->data;
+
+ if (n_devs <= 0)
+ n_devs = 1;
+
+ for (i = 0; i < n_devs; i++) {
+ ret = vivi_create_instance(i);
+ if (ret) {
+ /* If some instantiations succeeded, keep driver */
+ if (i)
+ ret = 0;
+ break;
+ }
+ }
+
+ if (ret < 0) {
+ printk(KERN_ERR "vivi: error %d while loading driver\n", ret);
+ return ret;
+ }
+
+ printk(KERN_INFO "Video Technology Magazine Virtual Video "
+ "Capture Board ver %s successfully loaded.\n",
+ VIVI_VERSION);
+
+ /* n_devs will reflect the actual number of allocated devices */
+ n_devs = i;
+
+ return ret;
+}
+
+static void __exit vivi_exit(void)
+{
+ vivi_release();
+}
+
+module_init(vivi_init);
+module_exit(vivi_exit);

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