diff options
Diffstat (limited to 'drivers/media/platform/vivi.c')
| -rw-r--r-- | drivers/media/platform/vivi.c | 1537 |
1 files changed, 1537 insertions, 0 deletions
diff --git a/drivers/media/platform/vivi.c b/drivers/media/platform/vivi.c new file mode 100644 index 0000000..85bc314 --- /dev/null +++ b/drivers/media/platform/vivi.c @@ -0,0 +1,1537 @@ +/* + * 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" + +/* Maximum allowed frame rate + * + * Vivi will allow setting timeperframe in [1/FPS_MAX - FPS_MAX/1] range. + * + * Ideally FPS_MAX should be infinity, i.e. practically UINT_MAX, but that + * might hit application errors when they manipulate these values. + * + * Besides, for tpf < 1ms image-generation logic should be changed, to avoid + * producing frames with equal content. + */ +#define FPS_MAX 1000 + +#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; + +/* timeperframe: min/max and default */ +static const struct v4l2_fract + tpf_min = {.numerator = 1, .denominator = FPS_MAX}, + tpf_max = {.numerator = FPS_MAX, .denominator = 1}, + tpf_default = {.numerator = 1001, .denominator = 30000}; /* NTSC */ + +#define dprintk(dev, level, fmt, arg...) \ + v4l2_dbg(level, debug, &dev->v4l2_dev, fmt, ## arg) + +/* ------------------------------------------------------------------ + Basic structures + ------------------------------------------------------------------*/ + +struct vivi_fmt { + const char *name; + u32 fourcc; /* v4l2 format id */ + u8 depth; + bool is_yuv; +}; + +static const 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 const struct vivi_fmt *__get_format(u32 pixelformat) +{ + const struct vivi_fmt *fmt; + unsigned int k; + + for (k = 0; k < ARRAY_SIZE(formats); k++) { + fmt = &formats[k]; + if (fmt->fourcc == pixelformat) + break; + } + + if (k == ARRAY_SIZE(formats)) + return NULL; + + return &formats[k]; +} + +static const struct vivi_fmt *get_format(struct v4l2_format *f) +{ + return __get_format(f->fmt.pix.pixelformat); +} + +/* buffer for one video frame */ +struct vivi_buffer { + /* common v4l buffer stuff -- must be first */ + struct vb2_buffer vb; + struct list_head list; + const 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 */ + const struct vivi_fmt *fmt; + struct v4l2_fract timeperframe; + unsigned int width, height; + struct vb2_queue vb_vidq; + unsigned int field_count; + + u8 bars[9][3]; + u8 line[MAX_WIDTH * 8] __attribute__((__aligned__(4))); + unsigned int pixelsize; + u8 alpha_component; + u32 textfg, textbg; +}; + +/* ------------------------------------------------------------------ + 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 const 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; + } + } +} + +/* '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) +{ + unsigned pixsize = dev->pixelsize; + unsigned pixsize2 = 2*pixsize; + int colorpos; + u8 *pos; + + for (colorpos = 0; colorpos < 16; ++colorpos) { + u8 pix[8]; + int wstart = colorpos * dev->width / 8; + int wend = (colorpos+1) * dev->width / 8; + int w; + + gen_twopix(dev, &pix[0], colorpos % 8, 0); + gen_twopix(dev, &pix[pixsize], colorpos % 8, 1); + + for (w = wstart/2*2, pos = dev->line + w*pixsize; w < wend; w += 2, pos += pixsize2) + memcpy(pos, pix, pixsize2); + } +} + +/* need this to do rgb24 rendering */ +typedef struct { u16 __; u8 _; } __attribute__((packed)) x24; + +static void gen_text(struct vivi_dev *dev, char *basep, + int y, int x, char *text) +{ + int line; + unsigned int width = dev->width; + + /* Checks if it is possible to show string */ + if (y + 16 >= dev->height || x + strlen(text) * 8 >= width) + return; + + /* Print stream time */ +#define PRINTSTR(PIXTYPE) do { \ + PIXTYPE fg; \ + PIXTYPE bg; \ + memcpy(&fg, &dev->textfg, sizeof(PIXTYPE)); \ + memcpy(&bg, &dev->textbg, sizeof(PIXTYPE)); \ + \ + for (line = 0; line < 16; line++) { \ + PIXTYPE *pos = (PIXTYPE *)( basep + ((y + line) * width + x) * sizeof(PIXTYPE) ); \ + u8 *s; \ + \ + for (s = text; *s; s++) { \ + u8 chr = font8x16[*s * 16 + line]; \ + \ + pos[0] = (chr & (0x01 << 7) ? fg : bg); \ + pos[1] = (chr & (0x01 << 6) ? fg : bg); \ + pos[2] = (chr & (0x01 << 5) ? fg : bg); \ + pos[3] = (chr & (0x01 << 4) ? fg : bg); \ + pos[4] = (chr & (0x01 << 3) ? fg : bg); \ + pos[5] = (chr & (0x01 << 2) ? fg : bg); \ + pos[6] = (chr & (0x01 << 1) ? fg : bg); \ + pos[7] = (chr & (0x01 << 0) ? fg : bg); \ + \ + pos += 8; \ + } \ + } \ +} while (0) + + switch (dev->pixelsize) { + case 2: + PRINTSTR(u16); break; + case 4: + PRINTSTR(u32); break; + case 3: + PRINTSTR(x24); break; + } +} + +static void vivi_fillbuff(struct vivi_dev *dev, struct vivi_buffer *buf) +{ + int stride = dev->width * dev->pixelsize; + int hmax = dev->height; + void *vbuf = vb2_plane_vaddr(&buf->vb, 0); + unsigned ms; + char str[100]; + int h, line = 1; + u8 *linestart; + s32 gain; + + if (!vbuf) + return; + + linestart = dev->line + (dev->mv_count % dev->width) * dev->pixelsize; + + for (h = 0; h < hmax; h++) + memcpy(vbuf + h * stride, linestart, stride); + + /* Updates stream time */ + + gen_twopix(dev, (u8 *)&dev->textbg, TEXT_BLACK, /*odd=*/ 0); + gen_twopix(dev, (u8 *)&dev->textfg, WHITE, /*odd=*/ 0); + + 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; + v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp); +} + +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); + + v4l2_get_timestamp(&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(dev, frames) \ + ((frames * dev->timeperframe.numerator * 1000) / dev->timeperframe.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(dev, 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 const 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"); + snprintf(cap->bus_info, sizeof(cap->bus_info), + "platform:%s", dev->v4l2_dev.name); + 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) +{ + const 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); + const 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; + /* + * Modify the brightness range depending on the input. + * This makes it easy to use vivi to test if applications can + * handle control range modifications and is also how this is + * typically used in practice as different inputs may be hooked + * up to different receivers with different control ranges. + */ + v4l2_ctrl_modify_range(dev->brightness, + 128 * i, 255 + 128 * i, 1, 127 + 128 * i); + precalculate_bars(dev); + precalculate_line(dev); + return 0; +} + +/* timeperframe is arbitrary and continous */ +static int vidioc_enum_frameintervals(struct file *file, void *priv, + struct v4l2_frmivalenum *fival) +{ + const struct vivi_fmt *fmt; + + if (fival->index) + return -EINVAL; + + fmt = __get_format(fival->pixel_format); + if (!fmt) + return -EINVAL; + + /* regarding width & height - we support any */ + + fival->type = V4L2_FRMIVAL_TYPE_CONTINUOUS; + + /* fill in stepwise (step=1.0 is requred by V4L2 spec) */ + fival->stepwise.min = tpf_min; + fival->stepwise.max = tpf_max; + fival->stepwise.step = (struct v4l2_fract) {1, 1}; + + return 0; +} + +static int vidioc_g_parm(struct file *file, void *priv, + struct v4l2_streamparm *parm) +{ + struct vivi_dev *dev = video_drvdata(file); + + if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + + parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME; + parm->parm.capture.timeperframe = dev->timeperframe; + parm->parm.capture.readbuffers = 1; + return 0; +} + +#define FRACT_CMP(a, OP, b) \ + ((u64)(a).numerator * (b).denominator OP (u64)(b).numerator * (a).denominator) + +static int vidioc_s_parm(struct file *file, void *priv, + struct v4l2_streamparm *parm) +{ + struct vivi_dev *dev = video_drvdata(file); + struct v4l2_fract tpf; + + if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + + tpf = parm->parm.capture.timeperframe; + + /* tpf: {*, 0} resets timing; clip to [min, max]*/ + tpf = tpf.denominator ? tpf : tpf_default; + tpf = FRACT_CMP(tpf, <, tpf_min) ? tpf_min : tpf; + tpf = FRACT_CMP(tpf, >, tpf_max) ? tpf_max : tpf; + + dev->timeperframe = tpf; + parm->parm.capture.timeperframe = tpf; + parm->parm.capture.readbuffers = 1; + 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_enum_frameintervals = vidioc_enum_frameintervals, + .vidioc_g_parm = vidioc_g_parm, + .vidioc_s_parm = vidioc_s_parm, + .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 const 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->timeperframe = tpf_default; + 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; + q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | 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; + q->timestamp_type = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; + + ret = vb2_queue_init(q); + if (ret) + goto unreg_dev; + + 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); |