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linux-zen-desktop/drivers/media/usb/em28xx/em28xx-video.c

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Initial commit
2023-08-30 17:31:07 +02:00
// SPDX-License-Identifier: GPL-2.0+
//
// em28xx-video.c - driver for Empia EM2800/EM2820/2840 USB
// video capture devices
//
// Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
// Markus Rechberger <mrechberger@gmail.com>
// Mauro Carvalho Chehab <mchehab@kernel.org>
// Sascha Sommer <saschasommer@freenet.de>
// Copyright (C) 2012 Frank Schäfer <fschaefer.oss@googlemail.com>
//
// Some parts based on SN9C10x PC Camera Controllers GPL driver made
// by Luca Risolia <luca.risolia@studio.unibo.it>
#include "em28xx.h"
#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/bitmap.h>
#include <linux/usb.h>
#include <linux/i2c.h>
#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include "em28xx-v4l.h"
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-event.h>
#include <media/drv-intf/msp3400.h>
#include <media/tuner.h>
#define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
"Markus Rechberger <mrechberger@gmail.com>, " \
"Mauro Carvalho Chehab <mchehab@kernel.org>, " \
"Sascha Sommer <saschasommer@freenet.de>"
static unsigned int isoc_debug;
module_param(isoc_debug, int, 0644);
MODULE_PARM_DESC(isoc_debug, "enable debug messages [isoc transfers]");
static unsigned int disable_vbi;
module_param(disable_vbi, int, 0644);
MODULE_PARM_DESC(disable_vbi, "disable vbi support");
static int alt;
module_param(alt, int, 0644);
MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
#define em28xx_videodbg(fmt, arg...) do { \
if (video_debug) \
dev_printk(KERN_DEBUG, &dev->intf->dev, \
"video: %s: " fmt, __func__, ## arg); \
} while (0)
#define em28xx_isocdbg(fmt, arg...) do {\
if (isoc_debug) \
dev_printk(KERN_DEBUG, &dev->intf->dev, \
"isoc: %s: " fmt, __func__, ## arg); \
} while (0)
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC " - v4l2 interface");
MODULE_LICENSE("GPL v2");
MODULE_VERSION(EM28XX_VERSION);
#define EM25XX_FRMDATAHDR_BYTE1 0x02
#define EM25XX_FRMDATAHDR_BYTE2_STILL_IMAGE 0x20
#define EM25XX_FRMDATAHDR_BYTE2_FRAME_END 0x02
#define EM25XX_FRMDATAHDR_BYTE2_FRAME_ID 0x01
#define EM25XX_FRMDATAHDR_BYTE2_MASK (EM25XX_FRMDATAHDR_BYTE2_STILL_IMAGE | \
EM25XX_FRMDATAHDR_BYTE2_FRAME_END | \
EM25XX_FRMDATAHDR_BYTE2_FRAME_ID)
static unsigned int video_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
static unsigned int vbi_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
static unsigned int radio_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
module_param_array(video_nr, int, NULL, 0444);
module_param_array(vbi_nr, int, NULL, 0444);
module_param_array(radio_nr, int, NULL, 0444);
MODULE_PARM_DESC(video_nr, "video device numbers");
MODULE_PARM_DESC(vbi_nr, "vbi device numbers");
MODULE_PARM_DESC(radio_nr, "radio device numbers");
static unsigned int video_debug;
module_param(video_debug, int, 0644);
MODULE_PARM_DESC(video_debug, "enable debug messages [video]");
/* supported video standards */
static struct em28xx_fmt format[] = {
{
.fourcc = V4L2_PIX_FMT_YUYV,
.depth = 16,
.reg = EM28XX_OUTFMT_YUV422_Y0UY1V,
}, {
.fourcc = V4L2_PIX_FMT_RGB565,
.depth = 16,
.reg = EM28XX_OUTFMT_RGB_16_656,
}, {
.fourcc = V4L2_PIX_FMT_SRGGB8,
.depth = 8,
.reg = EM28XX_OUTFMT_RGB_8_RGRG,
}, {
.fourcc = V4L2_PIX_FMT_SBGGR8,
.depth = 8,
.reg = EM28XX_OUTFMT_RGB_8_BGBG,
}, {
.fourcc = V4L2_PIX_FMT_SGRBG8,
.depth = 8,
.reg = EM28XX_OUTFMT_RGB_8_GRGR,
}, {
.fourcc = V4L2_PIX_FMT_SGBRG8,
.depth = 8,
.reg = EM28XX_OUTFMT_RGB_8_GBGB,
}, {
.fourcc = V4L2_PIX_FMT_YUV411P,
.depth = 12,
.reg = EM28XX_OUTFMT_YUV411,
},
};
/*FIXME: maxw should be dependent of alt mode */
static inline unsigned int norm_maxw(struct em28xx *dev)
{
struct em28xx_v4l2 *v4l2 = dev->v4l2;
if (dev->is_webcam)
return v4l2->sensor_xres;
if (dev->board.max_range_640_480)
return 640;
return 720;
}
static inline unsigned int norm_maxh(struct em28xx *dev)
{
struct em28xx_v4l2 *v4l2 = dev->v4l2;
if (dev->is_webcam)
return v4l2->sensor_yres;
if (dev->board.max_range_640_480)
return 480;
return (v4l2->norm & V4L2_STD_625_50) ? 576 : 480;
}
static int em28xx_vbi_supported(struct em28xx *dev)
{
/* Modprobe option to manually disable */
if (disable_vbi == 1)
return 0;
if (dev->is_webcam)
return 0;
/* FIXME: check subdevices for VBI support */
if (dev->chip_id == CHIP_ID_EM2860 ||
dev->chip_id == CHIP_ID_EM2883)
return 1;
/* Version of em28xx that does not support VBI */
return 0;
}
/*
* em28xx_wake_i2c()
* configure i2c attached devices
*/
static void em28xx_wake_i2c(struct em28xx *dev)
{
struct v4l2_device *v4l2_dev = &dev->v4l2->v4l2_dev;
v4l2_device_call_all(v4l2_dev, 0, core, reset, 0);
v4l2_device_call_all(v4l2_dev, 0, video, s_routing,
INPUT(dev->ctl_input)->vmux, 0, 0);
}
static int em28xx_colorlevels_set_default(struct em28xx *dev)
{
em28xx_write_reg(dev, EM28XX_R20_YGAIN, CONTRAST_DEFAULT);
em28xx_write_reg(dev, EM28XX_R21_YOFFSET, BRIGHTNESS_DEFAULT);
em28xx_write_reg(dev, EM28XX_R22_UVGAIN, SATURATION_DEFAULT);
em28xx_write_reg(dev, EM28XX_R23_UOFFSET, BLUE_BALANCE_DEFAULT);
em28xx_write_reg(dev, EM28XX_R24_VOFFSET, RED_BALANCE_DEFAULT);
em28xx_write_reg(dev, EM28XX_R25_SHARPNESS, SHARPNESS_DEFAULT);
em28xx_write_reg(dev, EM28XX_R14_GAMMA, 0x20);
em28xx_write_reg(dev, EM28XX_R15_RGAIN, 0x20);
em28xx_write_reg(dev, EM28XX_R16_GGAIN, 0x20);
em28xx_write_reg(dev, EM28XX_R17_BGAIN, 0x20);
em28xx_write_reg(dev, EM28XX_R18_ROFFSET, 0x00);
em28xx_write_reg(dev, EM28XX_R19_GOFFSET, 0x00);
return em28xx_write_reg(dev, EM28XX_R1A_BOFFSET, 0x00);
}
static int em28xx_set_outfmt(struct em28xx *dev)
{
int ret;
u8 fmt, vinctrl;
struct em28xx_v4l2 *v4l2 = dev->v4l2;
fmt = v4l2->format->reg;
if (!dev->is_em25xx)
fmt |= 0x20;
/*
* NOTE: it's not clear if this is really needed !
* The datasheets say bit 5 is a reserved bit and devices seem to work
* fine without it. But the Windows driver sets it for em2710/50+em28xx
* devices and we've always been setting it, too.
*
* em2765 (em25xx, em276x/7x/8x) devices do NOT work with this bit set,
* it's likely used for an additional (compressed ?) format there.
*/
ret = em28xx_write_reg(dev, EM28XX_R27_OUTFMT, fmt);
if (ret < 0)
return ret;
ret = em28xx_write_reg(dev, EM28XX_R10_VINMODE, v4l2->vinmode);
if (ret < 0)
return ret;
vinctrl = v4l2->vinctl;
if (em28xx_vbi_supported(dev) == 1) {
vinctrl |= EM28XX_VINCTRL_VBI_RAW;
em28xx_write_reg(dev, EM28XX_R34_VBI_START_H, 0x00);
em28xx_write_reg(dev, EM28XX_R36_VBI_WIDTH,
v4l2->vbi_width / 4);
em28xx_write_reg(dev, EM28XX_R37_VBI_HEIGHT, v4l2->vbi_height);
if (v4l2->norm & V4L2_STD_525_60) {
/* NTSC */
em28xx_write_reg(dev, EM28XX_R35_VBI_START_V, 0x09);
} else if (v4l2->norm & V4L2_STD_625_50) {
/* PAL */
em28xx_write_reg(dev, EM28XX_R35_VBI_START_V, 0x07);
}
}
return em28xx_write_reg(dev, EM28XX_R11_VINCTRL, vinctrl);
}
static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
u8 ymin, u8 ymax)
{
em28xx_videodbg("em28xx Scale: (%d,%d)-(%d,%d)\n",
xmin, ymin, xmax, ymax);
em28xx_write_regs(dev, EM28XX_R28_XMIN, &xmin, 1);
em28xx_write_regs(dev, EM28XX_R29_XMAX, &xmax, 1);
em28xx_write_regs(dev, EM28XX_R2A_YMIN, &ymin, 1);
return em28xx_write_regs(dev, EM28XX_R2B_YMAX, &ymax, 1);
}
static void em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
u16 width, u16 height)
{
u8 cwidth = width >> 2;
u8 cheight = height >> 2;
u8 overflow = (height >> 9 & 0x02) | (width >> 10 & 0x01);
/* NOTE: size limit: 2047x1023 = 2MPix */
em28xx_videodbg("capture area set to (%d,%d): %dx%d\n",
hstart, vstart,
((overflow & 2) << 9 | cwidth << 2),
((overflow & 1) << 10 | cheight << 2));
em28xx_write_regs(dev, EM28XX_R1C_HSTART, &hstart, 1);
em28xx_write_regs(dev, EM28XX_R1D_VSTART, &vstart, 1);
em28xx_write_regs(dev, EM28XX_R1E_CWIDTH, &cwidth, 1);
em28xx_write_regs(dev, EM28XX_R1F_CHEIGHT, &cheight, 1);
em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1);
/* FIXME: function/meaning of these registers ? */
/* FIXME: align width+height to multiples of 4 ?! */
if (dev->is_em25xx) {
em28xx_write_reg(dev, 0x34, width >> 4);
em28xx_write_reg(dev, 0x35, height >> 4);
}
}
static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
{
u8 mode = 0x00;
/* the em2800 scaler only supports scaling down to 50% */
if (dev->board.is_em2800) {
mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
} else {
u8 buf[2];
buf[0] = h;
buf[1] = h >> 8;
em28xx_write_regs(dev, EM28XX_R30_HSCALELOW, (char *)buf, 2);
buf[0] = v;
buf[1] = v >> 8;
em28xx_write_regs(dev, EM28XX_R32_VSCALELOW, (char *)buf, 2);
/*
* it seems that both H and V scalers must be active
* to work correctly
*/
mode = (h || v) ? 0x30 : 0x00;
}
return em28xx_write_reg(dev, EM28XX_R26_COMPR, mode);
}
/* FIXME: this only function read values from dev */
static int em28xx_resolution_set(struct em28xx *dev)
{
struct em28xx_v4l2 *v4l2 = dev->v4l2;
int width = norm_maxw(dev);
int height = norm_maxh(dev);
/* Properly setup VBI */
v4l2->vbi_width = 720;
if (v4l2->norm & V4L2_STD_525_60)
v4l2->vbi_height = 12;
else
v4l2->vbi_height = 18;
em28xx_set_outfmt(dev);
em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
/*
* If we don't set the start position to 2 in VBI mode, we end up
* with line 20/21 being YUYV encoded instead of being in 8-bit
* greyscale. The core of the issue is that line 21 (and line 23 for
* PAL WSS) are inside of active video region, and as a result they
* get the pixelformatting associated with that area. So by cropping
* it out, we end up with the same format as the rest of the VBI
* region
*/
if (em28xx_vbi_supported(dev) == 1)
em28xx_capture_area_set(dev, 0, 2, width, height);
else
em28xx_capture_area_set(dev, 0, 0, width, height);
return em28xx_scaler_set(dev, v4l2->hscale, v4l2->vscale);
}
/* Set USB alternate setting for analog video */
static int em28xx_set_alternate(struct em28xx *dev)
{
struct em28xx_v4l2 *v4l2 = dev->v4l2;
struct usb_device *udev = interface_to_usbdev(dev->intf);
int err;
int i;
unsigned int min_pkt_size = v4l2->width * 2 + 4;
/*
* NOTE: for isoc transfers, only alt settings > 0 are allowed
* bulk transfers seem to work only with alt=0 !
*/
dev->alt = 0;
if (alt > 0 && alt < dev->num_alt) {
em28xx_videodbg("alternate forced to %d\n", dev->alt);
dev->alt = alt;
goto set_alt;
}
if (dev->analog_xfer_bulk)
goto set_alt;
/*
* When image size is bigger than a certain value,
* the frame size should be increased, otherwise, only
* green screen will be received.
*/
if (v4l2->width * 2 * v4l2->height > 720 * 240 * 2)
min_pkt_size *= 2;
for (i = 0; i < dev->num_alt; i++) {
/* stop when the selected alt setting offers enough bandwidth */
if (dev->alt_max_pkt_size_isoc[i] >= min_pkt_size) {
dev->alt = i;
break;
/*
* otherwise make sure that we end up with the maximum
* bandwidth because the min_pkt_size equation might be wrong.
*
*/
} else if (dev->alt_max_pkt_size_isoc[i] >
dev->alt_max_pkt_size_isoc[dev->alt])
dev->alt = i;
}
set_alt:
/*
* NOTE: for bulk transfers, we need to call usb_set_interface()
* even if the previous settings were the same. Otherwise streaming
* fails with all urbs having status = -EOVERFLOW !
*/
if (dev->analog_xfer_bulk) {
dev->max_pkt_size = 512; /* USB 2.0 spec */
dev->packet_multiplier = EM28XX_BULK_PACKET_MULTIPLIER;
} else { /* isoc */
em28xx_videodbg("minimum isoc packet size: %u (alt=%d)\n",
min_pkt_size, dev->alt);
dev->max_pkt_size =
dev->alt_max_pkt_size_isoc[dev->alt];
dev->packet_multiplier = EM28XX_NUM_ISOC_PACKETS;
}
em28xx_videodbg("setting alternate %d with wMaxPacketSize=%u\n",
dev->alt, dev->max_pkt_size);
err = usb_set_interface(udev, dev->ifnum, dev->alt);
if (err < 0) {
dev_err(&dev->intf->dev,
"cannot change alternate number to %d (error=%i)\n",
dev->alt, err);
return err;
}
return 0;
}
/*
* DMA and thread functions
*/
/*
* Finish the current buffer
*/
static inline void finish_buffer(struct em28xx *dev,
struct em28xx_buffer *buf)
{
em28xx_isocdbg("[%p/%d] wakeup\n", buf, buf->top_field);
buf->vb.sequence = dev->v4l2->field_count++;
if (dev->v4l2->progressive)
buf->vb.field = V4L2_FIELD_NONE;
else
buf->vb.field = V4L2_FIELD_INTERLACED;
buf->vb.vb2_buf.timestamp = ktime_get_ns();
vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
}
/*
* Copy picture data from USB buffer to video buffer
*/
static void em28xx_copy_video(struct em28xx *dev,
struct em28xx_buffer *buf,
unsigned char *usb_buf,
unsigned long len)
{
struct em28xx_v4l2 *v4l2 = dev->v4l2;
void *fieldstart, *startwrite, *startread;
int linesdone, currlinedone, offset, lencopy, remain;
int bytesperline = v4l2->width << 1;
if (buf->pos + len > buf->length)
len = buf->length - buf->pos;
startread = usb_buf;
remain = len;
if (v4l2->progressive || buf->top_field)
fieldstart = buf->vb_buf;
else /* interlaced mode, even nr. of lines */
fieldstart = buf->vb_buf + bytesperline;
linesdone = buf->pos / bytesperline;
currlinedone = buf->pos % bytesperline;
if (v4l2->progressive)
offset = linesdone * bytesperline + currlinedone;
else
offset = linesdone * bytesperline * 2 + currlinedone;
startwrite = fieldstart + offset;
lencopy = bytesperline - currlinedone;
lencopy = lencopy > remain ? remain : lencopy;
if ((char *)startwrite + lencopy > (char *)buf->vb_buf + buf->length) {
em28xx_isocdbg("Overflow of %zu bytes past buffer end (1)\n",
((char *)startwrite + lencopy) -
((char *)buf->vb_buf + buf->length));
remain = (char *)buf->vb_buf + buf->length -
(char *)startwrite;
lencopy = remain;
}
if (lencopy <= 0)
return;
memcpy(startwrite, startread, lencopy);
remain -= lencopy;
while (remain > 0) {
if (v4l2->progressive)
startwrite += lencopy;
else
startwrite += lencopy + bytesperline;
startread += lencopy;
if (bytesperline > remain)
lencopy = remain;
else
lencopy = bytesperline;
if ((char *)startwrite + lencopy > (char *)buf->vb_buf +
buf->length) {
em28xx_isocdbg("Overflow of %zu bytes past buffer end(2)\n",
((char *)startwrite + lencopy) -
((char *)buf->vb_buf + buf->length));
remain = (char *)buf->vb_buf + buf->length -
(char *)startwrite;
lencopy = remain;
}
if (lencopy <= 0)
break;
memcpy(startwrite, startread, lencopy);
remain -= lencopy;
}
buf->pos += len;
}
/*
* Copy VBI data from USB buffer to video buffer
*/
static void em28xx_copy_vbi(struct em28xx *dev,
struct em28xx_buffer *buf,
unsigned char *usb_buf,
unsigned long len)
{
unsigned int offset;
if (buf->pos + len > buf->length)
len = buf->length - buf->pos;
offset = buf->pos;
/* Make sure the bottom field populates the second half of the frame */
if (buf->top_field == 0)
offset += dev->v4l2->vbi_width * dev->v4l2->vbi_height;
memcpy(buf->vb_buf + offset, usb_buf, len);
buf->pos += len;
}
static inline void print_err_status(struct em28xx *dev,
int packet, int status)
{
char *errmsg = "Unknown";
switch (status) {
case -ENOENT:
errmsg = "unlinked synchronously";
break;
case -ECONNRESET:
errmsg = "unlinked asynchronously";
break;
case -ENOSR:
errmsg = "Buffer error (overrun)";
break;
case -EPIPE:
errmsg = "Stalled (device not responding)";
break;
case -EOVERFLOW:
errmsg = "Babble (bad cable?)";
break;
case -EPROTO:
errmsg = "Bit-stuff error (bad cable?)";
break;
case -EILSEQ:
errmsg = "CRC/Timeout (could be anything)";
break;
case -ETIME:
errmsg = "Device does not respond";
break;
}
if (packet < 0) {
em28xx_isocdbg("URB status %d [%s].\n", status, errmsg);
} else {
em28xx_isocdbg("URB packet %d, status %d [%s].\n",
packet, status, errmsg);
}
}
/*
* get the next available buffer from dma queue
*/
static inline struct em28xx_buffer *get_next_buf(struct em28xx *dev,
struct em28xx_dmaqueue *dma_q)
{
struct em28xx_buffer *buf;
if (list_empty(&dma_q->active)) {
em28xx_isocdbg("No active queue to serve\n");
return NULL;
}
/* Get the next buffer */
buf = list_entry(dma_q->active.next, struct em28xx_buffer, list);
/* Cleans up buffer - Useful for testing for frame/URB loss */
list_del(&buf->list);
buf->pos = 0;
buf->vb_buf = buf->mem;
return buf;
}
/*
* Finish the current buffer if completed and prepare for the next field
*/
static struct em28xx_buffer *
finish_field_prepare_next(struct em28xx *dev,
struct em28xx_buffer *buf,
struct em28xx_dmaqueue *dma_q)
{
struct em28xx_v4l2 *v4l2 = dev->v4l2;
if (v4l2->progressive || v4l2->top_field) { /* Brand new frame */
if (buf)
finish_buffer(dev, buf);
buf = get_next_buf(dev, dma_q);
}
if (buf) {
buf->top_field = v4l2->top_field;
buf->pos = 0;
}
return buf;
}
/*
* Process data packet according to the em2710/em2750/em28xx frame data format
*/
static inline void process_frame_data_em28xx(struct em28xx *dev,
unsigned char *data_pkt,
unsigned int data_len)
{
struct em28xx_v4l2 *v4l2 = dev->v4l2;
struct em28xx_buffer *buf = dev->usb_ctl.vid_buf;
struct em28xx_buffer *vbi_buf = dev->usb_ctl.vbi_buf;
struct em28xx_dmaqueue *dma_q = &dev->vidq;
struct em28xx_dmaqueue *vbi_dma_q = &dev->vbiq;
/*
* capture type 0 = vbi start
* capture type 1 = vbi in progress
* capture type 2 = video start
* capture type 3 = video in progress
*/
if (data_len >= 4) {
/*
* NOTE: Headers are always 4 bytes and
* never split across packets
*/
if (data_pkt[0] == 0x88 && data_pkt[1] == 0x88 &&
data_pkt[2] == 0x88 && data_pkt[3] == 0x88) {
/* Continuation */
data_pkt += 4;
data_len -= 4;
} else if (data_pkt[0] == 0x33 && data_pkt[1] == 0x95) {
/* Field start (VBI mode) */
v4l2->capture_type = 0;
v4l2->vbi_read = 0;
em28xx_isocdbg("VBI START HEADER !!!\n");
v4l2->top_field = !(data_pkt[2] & 1);
data_pkt += 4;
data_len -= 4;
} else if (data_pkt[0] == 0x22 && data_pkt[1] == 0x5a) {
/* Field start (VBI disabled) */
v4l2->capture_type = 2;
em28xx_isocdbg("VIDEO START HEADER !!!\n");
v4l2->top_field = !(data_pkt[2] & 1);
data_pkt += 4;
data_len -= 4;
}
}
/*
* NOTE: With bulk transfers, intermediate data packets
* have no continuation header
*/
if (v4l2->capture_type == 0) {
vbi_buf = finish_field_prepare_next(dev, vbi_buf, vbi_dma_q);
dev->usb_ctl.vbi_buf = vbi_buf;
v4l2->capture_type = 1;
}
if (v4l2->capture_type == 1) {
int vbi_size = v4l2->vbi_width * v4l2->vbi_height;
int vbi_data_len = ((v4l2->vbi_read + data_len) > vbi_size) ?
(vbi_size - v4l2->vbi_read) : data_len;
/* Copy VBI data */
if (vbi_buf)
em28xx_copy_vbi(dev, vbi_buf, data_pkt, vbi_data_len);
v4l2->vbi_read += vbi_data_len;
if (vbi_data_len < data_len) {
/* Continue with copying video data */
v4l2->capture_type = 2;
data_pkt += vbi_data_len;
data_len -= vbi_data_len;
}
}
if (v4l2->capture_type == 2) {
buf = finish_field_prepare_next(dev, buf, dma_q);
dev->usb_ctl.vid_buf = buf;
v4l2->capture_type = 3;
}
if (v4l2->capture_type == 3 && buf && data_len > 0)
em28xx_copy_video(dev, buf, data_pkt, data_len);
}
/*
* Process data packet according to the em25xx/em276x/7x/8x frame data format
*/
static inline void process_frame_data_em25xx(struct em28xx *dev,
unsigned char *data_pkt,
unsigned int data_len)
{
struct em28xx_buffer *buf = dev->usb_ctl.vid_buf;
struct em28xx_dmaqueue *dmaq = &dev->vidq;
struct em28xx_v4l2 *v4l2 = dev->v4l2;
bool frame_end = false;
/* Check for header */
/*
* NOTE: at least with bulk transfers, only the first packet
* has a header and has always set the FRAME_END bit
*/
if (data_len >= 2) { /* em25xx header is only 2 bytes long */
if ((data_pkt[0] == EM25XX_FRMDATAHDR_BYTE1) &&
((data_pkt[1] & ~EM25XX_FRMDATAHDR_BYTE2_MASK) == 0x00)) {
v4l2->top_field = !(data_pkt[1] &
EM25XX_FRMDATAHDR_BYTE2_FRAME_ID);
frame_end = data_pkt[1] &
EM25XX_FRMDATAHDR_BYTE2_FRAME_END;
data_pkt += 2;
data_len -= 2;
}
/* Finish field and prepare next (BULK only) */
if (dev->analog_xfer_bulk && frame_end) {
buf = finish_field_prepare_next(dev, buf, dmaq);
dev->usb_ctl.vid_buf = buf;
}
/*
* NOTE: in ISOC mode when a new frame starts and buf==NULL,
* we COULD already prepare a buffer here to avoid skipping the
* first frame.
*/
}
/* Copy data */
if (buf && data_len > 0)
em28xx_copy_video(dev, buf, data_pkt, data_len);
/* Finish frame (ISOC only) => avoids lag of 1 frame */
if (!dev->analog_xfer_bulk && frame_end) {
buf = finish_field_prepare_next(dev, buf, dmaq);
dev->usb_ctl.vid_buf = buf;
}
/*
* NOTES:
*
* 1) Tested with USB bulk transfers only !
* The wording in the datasheet suggests that isoc might work different.
* The current code assumes that with isoc transfers each packet has a
* header like with the other em28xx devices.
*
* 2) Support for interlaced mode is pure theory. It has not been
* tested and it is unknown if these devices actually support it.
*/
}
/* Processes and copies the URB data content (video and VBI data) */
static inline int em28xx_urb_data_copy(struct em28xx *dev, struct urb *urb)
{
int xfer_bulk, num_packets, i;
unsigned char *usb_data_pkt;
unsigned int usb_data_len;
if (!dev)
return 0;
if (dev->disconnected)
return 0;
if (urb->status < 0)
print_err_status(dev, -1, urb->status);
xfer_bulk = usb_pipebulk(urb->pipe);
if (xfer_bulk) /* bulk */
num_packets = 1;
else /* isoc */
num_packets = urb->number_of_packets;
for (i = 0; i < num_packets; i++) {
if (xfer_bulk) { /* bulk */
usb_data_len = urb->actual_length;
usb_data_pkt = urb->transfer_buffer;
} else { /* isoc */
if (urb->iso_frame_desc[i].status < 0) {
print_err_status(dev, i,
urb->iso_frame_desc[i].status);
if (urb->iso_frame_desc[i].status != -EPROTO)
continue;
}
usb_data_len = urb->iso_frame_desc[i].actual_length;
if (usb_data_len > dev->max_pkt_size) {
em28xx_isocdbg("packet bigger than packet size");
continue;
}
usb_data_pkt = urb->transfer_buffer +
urb->iso_frame_desc[i].offset;
}
if (usb_data_len == 0) {
/* NOTE: happens very often with isoc transfers */
/* em28xx_usbdbg("packet %d is empty",i); - spammy */
continue;
}
if (dev->is_em25xx)
process_frame_data_em25xx(dev,
usb_data_pkt, usb_data_len);
else
process_frame_data_em28xx(dev,
usb_data_pkt, usb_data_len);
}
return 1;
}
static int get_resource(enum v4l2_buf_type f_type)
{
switch (f_type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
return EM28XX_RESOURCE_VIDEO;
case V4L2_BUF_TYPE_VBI_CAPTURE:
return EM28XX_RESOURCE_VBI;
default:
WARN_ON(1);
return -1; /* Indicate that device is busy */
}
}
/* Usage lock check functions */
static int res_get(struct em28xx *dev, enum v4l2_buf_type f_type)
{
int res_type = get_resource(f_type);
/* is it free? */
if (dev->resources & res_type) {
/* no, someone else uses it */
return -EBUSY;
}
/* it's free, grab it */
dev->resources |= res_type;
em28xx_videodbg("res: get %d\n", res_type);
return 0;
}
static void res_free(struct em28xx *dev, enum v4l2_buf_type f_type)
{
int res_type = get_resource(f_type);
dev->resources &= ~res_type;
em28xx_videodbg("res: put %d\n", res_type);
}
static void em28xx_v4l2_media_release(struct em28xx *dev)
{
#ifdef CONFIG_MEDIA_CONTROLLER
int i;
for (i = 0; i < MAX_EM28XX_INPUT; i++) {
if (!INPUT(i)->type)
return;
media_device_unregister_entity(&dev->input_ent[i]);
}
#endif
}
/*
* Media Controller helper functions
*/
static int em28xx_enable_analog_tuner(struct em28xx *dev)
{
#ifdef CONFIG_MEDIA_CONTROLLER
struct media_device *mdev = dev->media_dev;
struct em28xx_v4l2 *v4l2 = dev->v4l2;
struct media_entity *source;
struct media_link *link, *found_link = NULL;
int ret, active_links = 0;
if (!mdev || !v4l2->decoder)
return 0;
/*
* This will find the tuner that is connected into the decoder.
* Technically, this is not 100% correct, as the device may be
* using an analog input instead of the tuner. However, as we can't
* do DVB streaming while the DMA engine is being used for V4L2,
* this should be enough for the actual needs.
*/
list_for_each_entry(link, &v4l2->decoder->links, list) {
if (link->sink->entity == v4l2->decoder) {
found_link = link;
if (link->flags & MEDIA_LNK_FL_ENABLED)
active_links++;
break;
}
}
if (active_links == 1 || !found_link)
return 0;
source = found_link->source->entity;
list_for_each_entry(link, &source->links, list) {
struct media_entity *sink;
int flags = 0;
sink = link->sink->entity;
if (sink == v4l2->decoder)
flags = MEDIA_LNK_FL_ENABLED;
ret = media_entity_setup_link(link, flags);
if (ret) {
dev_err(&dev->intf->dev,
"Couldn't change link %s->%s to %s. Error %d\n",
source->name, sink->name,
flags ? "enabled" : "disabled",
ret);
return ret;
}
em28xx_videodbg("link %s->%s was %s\n",
source->name, sink->name,
flags ? "ENABLED" : "disabled");
}
#endif
return 0;
}
static const char * const iname[] = {
[EM28XX_VMUX_COMPOSITE] = "Composite",
[EM28XX_VMUX_SVIDEO] = "S-Video",
[EM28XX_VMUX_TELEVISION] = "Television",
[EM28XX_RADIO] = "Radio",
};
static void em28xx_v4l2_create_entities(struct em28xx *dev)
{
#if defined(CONFIG_MEDIA_CONTROLLER)
struct em28xx_v4l2 *v4l2 = dev->v4l2;
int ret, i;
/* Initialize Video, VBI and Radio pads */
v4l2->video_pad.flags = MEDIA_PAD_FL_SINK;
ret = media_entity_pads_init(&v4l2->vdev.entity, 1, &v4l2->video_pad);
if (ret < 0)
dev_err(&dev->intf->dev,
"failed to initialize video media entity!\n");
if (em28xx_vbi_supported(dev)) {
v4l2->vbi_pad.flags = MEDIA_PAD_FL_SINK;
ret = media_entity_pads_init(&v4l2->vbi_dev.entity, 1,
&v4l2->vbi_pad);
if (ret < 0)
dev_err(&dev->intf->dev,
"failed to initialize vbi media entity!\n");
}
/* Webcams don't have input connectors */
if (dev->is_webcam)
return;
/* Create entities for each input connector */
for (i = 0; i < MAX_EM28XX_INPUT; i++) {
struct media_entity *ent = &dev->input_ent[i];
if (!INPUT(i)->type)
break;
ent->name = iname[INPUT(i)->type];
ent->flags = MEDIA_ENT_FL_CONNECTOR;
dev->input_pad[i].flags = MEDIA_PAD_FL_SOURCE;
switch (INPUT(i)->type) {
case EM28XX_VMUX_COMPOSITE:
ent->function = MEDIA_ENT_F_CONN_COMPOSITE;
break;
case EM28XX_VMUX_SVIDEO:
ent->function = MEDIA_ENT_F_CONN_SVIDEO;
break;
default: /* EM28XX_VMUX_TELEVISION or EM28XX_RADIO */
if (dev->tuner_type != TUNER_ABSENT)
ent->function = MEDIA_ENT_F_CONN_RF;
break;
}
ret = media_entity_pads_init(ent, 1, &dev->input_pad[i]);
if (ret < 0)
dev_err(&dev->intf->dev,
"failed to initialize input pad[%d]!\n", i);
ret = media_device_register_entity(dev->media_dev, ent);
if (ret < 0)
dev_err(&dev->intf->dev,
"failed to register input entity %d!\n", i);
}
#endif
}
/*
* Videobuf2 operations
*/
static int queue_setup(struct vb2_queue *vq,
unsigned int *nbuffers, unsigned int *nplanes,
unsigned int sizes[], struct device *alloc_devs[])
{
struct em28xx *dev = vb2_get_drv_priv(vq);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
unsigned long size =
(v4l2->width * v4l2->height * v4l2->format->depth + 7) >> 3;
if (*nplanes)
return sizes[0] < size ? -EINVAL : 0;
*nplanes = 1;
sizes[0] = size;
em28xx_enable_analog_tuner(dev);
return 0;
}
static int
buffer_prepare(struct vb2_buffer *vb)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
unsigned long size;
em28xx_videodbg("%s, field=%d\n", __func__, vbuf->field);
size = (v4l2->width * v4l2->height * v4l2->format->depth + 7) >> 3;
if (vb2_plane_size(vb, 0) < size) {
em28xx_videodbg("%s data will not fit into plane (%lu < %lu)\n",
__func__, vb2_plane_size(vb, 0), size);
return -EINVAL;
}
vb2_set_plane_payload(vb, 0, size);
return 0;
}
int em28xx_start_analog_streaming(struct vb2_queue *vq, unsigned int count)
{
struct em28xx *dev = vb2_get_drv_priv(vq);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
struct v4l2_frequency f;
struct v4l2_fh *owner;
int rc = 0;
em28xx_videodbg("%s\n", __func__);
dev->v4l2->field_count = 0;
/*
* Make sure streaming is not already in progress for this type
* of filehandle (e.g. video, vbi)
*/
rc = res_get(dev, vq->type);
if (rc)
return rc;
if (v4l2->streaming_users == 0) {
/* First active streaming user, so allocate all the URBs */
/* Allocate the USB bandwidth */
em28xx_set_alternate(dev);
/*
* Needed, since GPIO might have disabled power of
* some i2c device
*/
em28xx_wake_i2c(dev);
v4l2->capture_type = -1;
rc = em28xx_init_usb_xfer(dev, EM28XX_ANALOG_MODE,
dev->analog_xfer_bulk,
EM28XX_NUM_BUFS,
dev->max_pkt_size,
dev->packet_multiplier,
em28xx_urb_data_copy);
if (rc < 0)
return rc;
/*
* djh: it's not clear whether this code is still needed. I'm
* leaving it in here for now entirely out of concern for
* backward compatibility (the old code did it)
*/
/* Ask tuner to go to analog or radio mode */
memset(&f, 0, sizeof(f));
f.frequency = v4l2->frequency;
owner = (struct v4l2_fh *)vq->owner;
if (owner && owner->vdev->vfl_type == VFL_TYPE_RADIO)
f.type = V4L2_TUNER_RADIO;
else
f.type = V4L2_TUNER_ANALOG_TV;
v4l2_device_call_all(&v4l2->v4l2_dev,
0, tuner, s_frequency, &f);
/* Enable video stream at TV decoder */
v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_stream, 1);
}
v4l2->streaming_users++;
return rc;
}
static void em28xx_stop_streaming(struct vb2_queue *vq)
{
struct em28xx *dev = vb2_get_drv_priv(vq);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
struct em28xx_dmaqueue *vidq = &dev->vidq;
unsigned long flags = 0;
em28xx_videodbg("%s\n", __func__);
res_free(dev, vq->type);
if (v4l2->streaming_users-- == 1) {
/* Disable video stream at TV decoder */
v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_stream, 0);
/* Last active user, so shutdown all the URBS */
em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
}
spin_lock_irqsave(&dev->slock, flags);
if (dev->usb_ctl.vid_buf) {
vb2_buffer_done(&dev->usb_ctl.vid_buf->vb.vb2_buf,
VB2_BUF_STATE_ERROR);
dev->usb_ctl.vid_buf = NULL;
}
while (!list_empty(&vidq->active)) {
struct em28xx_buffer *buf;
buf = list_entry(vidq->active.next, struct em28xx_buffer, list);
list_del(&buf->list);
vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
}
spin_unlock_irqrestore(&dev->slock, flags);
}
void em28xx_stop_vbi_streaming(struct vb2_queue *vq)
{
struct em28xx *dev = vb2_get_drv_priv(vq);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
struct em28xx_dmaqueue *vbiq = &dev->vbiq;
unsigned long flags = 0;
em28xx_videodbg("%s\n", __func__);
res_free(dev, vq->type);
if (v4l2->streaming_users-- == 1) {
/* Disable video stream at TV decoder */
v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_stream, 0);
/* Last active user, so shutdown all the URBS */
em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
}
spin_lock_irqsave(&dev->slock, flags);
if (dev->usb_ctl.vbi_buf) {
vb2_buffer_done(&dev->usb_ctl.vbi_buf->vb.vb2_buf,
VB2_BUF_STATE_ERROR);
dev->usb_ctl.vbi_buf = NULL;
}
while (!list_empty(&vbiq->active)) {
struct em28xx_buffer *buf;
buf = list_entry(vbiq->active.next, struct em28xx_buffer, list);
list_del(&buf->list);
vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
}
spin_unlock_irqrestore(&dev->slock, flags);
}
static void
buffer_queue(struct vb2_buffer *vb)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
struct em28xx_buffer *buf =
container_of(vbuf, struct em28xx_buffer, vb);
struct em28xx_dmaqueue *vidq = &dev->vidq;
unsigned long flags = 0;
em28xx_videodbg("%s\n", __func__);
buf->mem = vb2_plane_vaddr(vb, 0);
buf->length = vb2_plane_size(vb, 0);
spin_lock_irqsave(&dev->slock, flags);
list_add_tail(&buf->list, &vidq->active);
spin_unlock_irqrestore(&dev->slock, flags);
}
static const struct vb2_ops em28xx_video_qops = {
.queue_setup = queue_setup,
.buf_prepare = buffer_prepare,
.buf_queue = buffer_queue,
.start_streaming = em28xx_start_analog_streaming,
.stop_streaming = em28xx_stop_streaming,
.wait_prepare = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,
};
static int em28xx_vb2_setup(struct em28xx *dev)
{
int rc;
struct vb2_queue *q;
struct em28xx_v4l2 *v4l2 = dev->v4l2;
/* Setup Videobuf2 for Video capture */
q = &v4l2->vb_vidq;
q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
q->drv_priv = dev;
q->buf_struct_size = sizeof(struct em28xx_buffer);
q->ops = &em28xx_video_qops;
q->mem_ops = &vb2_vmalloc_memops;
rc = vb2_queue_init(q);
if (rc < 0)
return rc;
/* Setup Videobuf2 for VBI capture */
q = &v4l2->vb_vbiq;
q->type = V4L2_BUF_TYPE_VBI_CAPTURE;
q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR;
q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
q->drv_priv = dev;
q->buf_struct_size = sizeof(struct em28xx_buffer);
q->ops = &em28xx_vbi_qops;
q->mem_ops = &vb2_vmalloc_memops;
rc = vb2_queue_init(q);
if (rc < 0)
return rc;
return 0;
}
/*
* v4l2 interface
*/
static void video_mux(struct em28xx *dev, int index)
{
struct v4l2_device *v4l2_dev = &dev->v4l2->v4l2_dev;
dev->ctl_input = index;
dev->ctl_ainput = INPUT(index)->amux;
dev->ctl_aoutput = INPUT(index)->aout;
if (!dev->ctl_aoutput)
dev->ctl_aoutput = EM28XX_AOUT_MASTER;
v4l2_device_call_all(v4l2_dev, 0, video, s_routing,
INPUT(index)->vmux, 0, 0);
if (dev->has_msp34xx) {
if (dev->i2s_speed) {
v4l2_device_call_all(v4l2_dev, 0, audio,
s_i2s_clock_freq, dev->i2s_speed);
}
/* Note: this is msp3400 specific */
v4l2_device_call_all(v4l2_dev, 0, audio, s_routing,
dev->ctl_ainput,
MSP_OUTPUT(MSP_SC_IN_DSP_SCART1), 0);
}
if (dev->board.adecoder != EM28XX_NOADECODER) {
v4l2_device_call_all(v4l2_dev, 0, audio, s_routing,
dev->ctl_ainput, dev->ctl_aoutput, 0);
}
em28xx_audio_analog_set(dev);
}
static void em28xx_ctrl_notify(struct v4l2_ctrl *ctrl, void *priv)
{
struct em28xx *dev = priv;
/*
* In the case of non-AC97 volume controls, we still need
* to do some setups at em28xx, in order to mute/unmute
* and to adjust audio volume. However, the value ranges
* should be checked by the corresponding V4L subdriver.
*/
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
dev->mute = ctrl->val;
em28xx_audio_analog_set(dev);
break;
case V4L2_CID_AUDIO_VOLUME:
dev->volume = ctrl->val;
em28xx_audio_analog_set(dev);
break;
}
}
static int em28xx_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct em28xx_v4l2 *v4l2 =
container_of(ctrl->handler, struct em28xx_v4l2, ctrl_handler);
struct em28xx *dev = v4l2->dev;
int ret = -EINVAL;
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
dev->mute = ctrl->val;
ret = em28xx_audio_analog_set(dev);
break;
case V4L2_CID_AUDIO_VOLUME:
dev->volume = ctrl->val;
ret = em28xx_audio_analog_set(dev);
break;
case V4L2_CID_CONTRAST:
ret = em28xx_write_reg(dev, EM28XX_R20_YGAIN, ctrl->val);
break;
case V4L2_CID_BRIGHTNESS:
ret = em28xx_write_reg(dev, EM28XX_R21_YOFFSET, ctrl->val);
break;
case V4L2_CID_SATURATION:
ret = em28xx_write_reg(dev, EM28XX_R22_UVGAIN, ctrl->val);
break;
case V4L2_CID_BLUE_BALANCE:
ret = em28xx_write_reg(dev, EM28XX_R23_UOFFSET, ctrl->val);
break;
case V4L2_CID_RED_BALANCE:
ret = em28xx_write_reg(dev, EM28XX_R24_VOFFSET, ctrl->val);
break;
case V4L2_CID_SHARPNESS:
ret = em28xx_write_reg(dev, EM28XX_R25_SHARPNESS, ctrl->val);
break;
}
return (ret < 0) ? ret : 0;
}
static const struct v4l2_ctrl_ops em28xx_ctrl_ops = {
.s_ctrl = em28xx_s_ctrl,
};
static void size_to_scale(struct em28xx *dev,
unsigned int width, unsigned int height,
unsigned int *hscale, unsigned int *vscale)
{
unsigned int maxw = norm_maxw(dev);
unsigned int maxh = norm_maxh(dev);
*hscale = (((unsigned long)maxw) << 12) / width - 4096L;
if (*hscale > EM28XX_HVSCALE_MAX)
*hscale = EM28XX_HVSCALE_MAX;
*vscale = (((unsigned long)maxh) << 12) / height - 4096L;
if (*vscale > EM28XX_HVSCALE_MAX)
*vscale = EM28XX_HVSCALE_MAX;
}
static void scale_to_size(struct em28xx *dev,
unsigned int hscale, unsigned int vscale,
unsigned int *width, unsigned int *height)
{
unsigned int maxw = norm_maxw(dev);
unsigned int maxh = norm_maxh(dev);
*width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
*height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
/* Don't let width or height to be zero */
if (*width < 1)
*width = 1;
if (*height < 1)
*height = 1;
}
/*
* IOCTL vidioc handling
*/
static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct em28xx *dev = video_drvdata(file);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
f->fmt.pix.width = v4l2->width;
f->fmt.pix.height = v4l2->height;
f->fmt.pix.pixelformat = v4l2->format->fourcc;
f->fmt.pix.bytesperline = (v4l2->width * v4l2->format->depth + 7) >> 3;
f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * v4l2->height;
f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
/* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
if (v4l2->progressive)
f->fmt.pix.field = V4L2_FIELD_NONE;
else
f->fmt.pix.field = v4l2->interlaced_fieldmode ?
V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;
return 0;
}
static struct em28xx_fmt *format_by_fourcc(unsigned int fourcc)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(format); i++)
if (format[i].fourcc == fourcc)
return &format[i];
return NULL;
}
static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct em28xx *dev = video_drvdata(file);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
unsigned int width = f->fmt.pix.width;
unsigned int height = f->fmt.pix.height;
unsigned int maxw = norm_maxw(dev);
unsigned int maxh = norm_maxh(dev);
unsigned int hscale, vscale;
struct em28xx_fmt *fmt;
fmt = format_by_fourcc(f->fmt.pix.pixelformat);
if (!fmt) {
fmt = &format[0];
em28xx_videodbg("Fourcc format (%08x) invalid. Using default (%08x).\n",
f->fmt.pix.pixelformat, fmt->fourcc);
}
if (dev->board.is_em2800) {
/* the em2800 can only scale down to 50% */
height = height > (3 * maxh / 4) ? maxh : maxh / 2;
width = width > (3 * maxw / 4) ? maxw : maxw / 2;
/*
* MaxPacketSize for em2800 is too small to capture at full
* resolution use half of maxw as the scaler can only scale
* to 50%
*/
if (width == maxw && height == maxh)
width /= 2;
} else {
/*
* width must even because of the YUYV format
* height must be even because of interlacing
*/
v4l_bound_align_image(&width, 48, maxw, 1, &height, 32, maxh,
1, 0);
}
/* Avoid division by zero at size_to_scale */
if (width < 1)
width = 1;
if (height < 1)
height = 1;
size_to_scale(dev, width, height, &hscale, &vscale);
scale_to_size(dev, hscale, vscale, &width, &height);
f->fmt.pix.width = width;
f->fmt.pix.height = height;
f->fmt.pix.pixelformat = fmt->fourcc;
f->fmt.pix.bytesperline = (width * fmt->depth + 7) >> 3;
f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * height;
f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
if (v4l2->progressive)
f->fmt.pix.field = V4L2_FIELD_NONE;
else
f->fmt.pix.field = v4l2->interlaced_fieldmode ?
V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;
return 0;
}
static int em28xx_set_video_format(struct em28xx *dev, unsigned int fourcc,
unsigned int width, unsigned int height)
{
struct em28xx_fmt *fmt;
struct em28xx_v4l2 *v4l2 = dev->v4l2;
fmt = format_by_fourcc(fourcc);
if (!fmt)
return -EINVAL;
v4l2->format = fmt;
v4l2->width = width;
v4l2->height = height;
/* set new image size */
size_to_scale(dev, v4l2->width, v4l2->height,
&v4l2->hscale, &v4l2->vscale);
em28xx_resolution_set(dev);
return 0;
}
static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct em28xx *dev = video_drvdata(file);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
if (vb2_is_busy(&v4l2->vb_vidq))
return -EBUSY;
vidioc_try_fmt_vid_cap(file, priv, f);
return em28xx_set_video_format(dev, f->fmt.pix.pixelformat,
f->fmt.pix.width, f->fmt.pix.height);
}
static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
{
struct em28xx *dev = video_drvdata(file);
*norm = dev->v4l2->norm;
return 0;
}
static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
{
struct em28xx *dev = video_drvdata(file);
v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, video, querystd, norm);
return 0;
}
static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
{
struct em28xx *dev = video_drvdata(file);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
struct v4l2_format f;
if (norm == v4l2->norm)
return 0;
if (v4l2->streaming_users > 0)
return -EBUSY;
v4l2->norm = norm;
/* Adjusts width/height, if needed */
f.fmt.pix.width = 720;
f.fmt.pix.height = (norm & V4L2_STD_525_60) ? 480 : 576;
vidioc_try_fmt_vid_cap(file, priv, &f);
/* set new image size */
v4l2->width = f.fmt.pix.width;
v4l2->height = f.fmt.pix.height;
size_to_scale(dev, v4l2->width, v4l2->height,
&v4l2->hscale, &v4l2->vscale);
em28xx_resolution_set(dev);
v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_std, v4l2->norm);
return 0;
}
static int vidioc_g_parm(struct file *file, void *priv,
struct v4l2_streamparm *p)
{
struct v4l2_subdev_frame_interval ival = { 0 };
struct em28xx *dev = video_drvdata(file);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
int rc = 0;
if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
return -EINVAL;
p->parm.capture.readbuffers = EM28XX_MIN_BUF;
p->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
if (dev->is_webcam) {
rc = v4l2_device_call_until_err(&v4l2->v4l2_dev, 0,
video, g_frame_interval, &ival);
if (!rc)
p->parm.capture.timeperframe = ival.interval;
} else {
v4l2_video_std_frame_period(v4l2->norm,
&p->parm.capture.timeperframe);
}
return rc;
}
static int vidioc_s_parm(struct file *file, void *priv,
struct v4l2_streamparm *p)
{
struct em28xx *dev = video_drvdata(file);
struct v4l2_subdev_frame_interval ival = {
0,
p->parm.capture.timeperframe
};
int rc = 0;
if (!dev->is_webcam)
return -ENOTTY;
if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
return -EINVAL;
memset(&p->parm, 0, sizeof(p->parm));
p->parm.capture.readbuffers = EM28XX_MIN_BUF;
p->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
rc = v4l2_device_call_until_err(&dev->v4l2->v4l2_dev, 0,
video, s_frame_interval, &ival);
if (!rc)
p->parm.capture.timeperframe = ival.interval;
return rc;
}
static int vidioc_enum_input(struct file *file, void *priv,
struct v4l2_input *i)
{
struct em28xx *dev = video_drvdata(file);
unsigned int n;
int j;
n = i->index;
if (n >= MAX_EM28XX_INPUT)
return -EINVAL;
if (!INPUT(n)->type)
return -EINVAL;
i->type = V4L2_INPUT_TYPE_CAMERA;
strscpy(i->name, iname[INPUT(n)->type], sizeof(i->name));
if (INPUT(n)->type == EM28XX_VMUX_TELEVISION)
i->type = V4L2_INPUT_TYPE_TUNER;
i->std = dev->v4l2->vdev.tvnorms;
/* webcams do not have the STD API */
if (dev->is_webcam)
i->capabilities = 0;
/* Dynamically generates an audioset bitmask */
i->audioset = 0;
for (j = 0; j < MAX_EM28XX_INPUT; j++)
if (dev->amux_map[j] != EM28XX_AMUX_UNUSED)
i->audioset |= 1 << j;
return 0;
}
static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
{
struct em28xx *dev = video_drvdata(file);
*i = dev->ctl_input;
return 0;
}
static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
{
struct em28xx *dev = video_drvdata(file);
if (i >= MAX_EM28XX_INPUT)
return -EINVAL;
if (!INPUT(i)->type)
return -EINVAL;
video_mux(dev, i);
return 0;
}
static int em28xx_fill_audio_input(struct em28xx *dev,
const char *s,
struct v4l2_audio *a,
unsigned int index)
{
unsigned int idx = dev->amux_map[index];
/*
* With msp3400, almost all mappings use the default (amux = 0).
* The only one may use a different value is WinTV USB2, where it
* can also be SCART1 input.
* As it is very doubtful that we would see new boards with msp3400,
* let's just reuse the existing switch.
*/
if (dev->has_msp34xx && idx != EM28XX_AMUX_UNUSED)
idx = EM28XX_AMUX_LINE_IN;
switch (idx) {
case EM28XX_AMUX_VIDEO:
strscpy(a->name, "Television", sizeof(a->name));
break;
case EM28XX_AMUX_LINE_IN:
strscpy(a->name, "Line In", sizeof(a->name));
break;
case EM28XX_AMUX_VIDEO2:
strscpy(a->name, "Television alt", sizeof(a->name));
break;
case EM28XX_AMUX_PHONE:
strscpy(a->name, "Phone", sizeof(a->name));
break;
case EM28XX_AMUX_MIC:
strscpy(a->name, "Mic", sizeof(a->name));
break;
case EM28XX_AMUX_CD:
strscpy(a->name, "CD", sizeof(a->name));
break;
case EM28XX_AMUX_AUX:
strscpy(a->name, "Aux", sizeof(a->name));
break;
case EM28XX_AMUX_PCM_OUT:
strscpy(a->name, "PCM", sizeof(a->name));
break;
case EM28XX_AMUX_UNUSED:
default:
return -EINVAL;
}
a->index = index;
a->capability = V4L2_AUDCAP_STEREO;
em28xx_videodbg("%s: audio input index %d is '%s'\n",
s, a->index, a->name);
return 0;
}
static int vidioc_enumaudio(struct file *file, void *fh, struct v4l2_audio *a)
{
struct em28xx *dev = video_drvdata(file);
if (a->index >= MAX_EM28XX_INPUT)
return -EINVAL;
return em28xx_fill_audio_input(dev, __func__, a, a->index);
}
static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
{
struct em28xx *dev = video_drvdata(file);
int i;
for (i = 0; i < MAX_EM28XX_INPUT; i++)
if (dev->ctl_ainput == dev->amux_map[i])
return em28xx_fill_audio_input(dev, __func__, a, i);
/* Should never happen! */
return -EINVAL;
}
static int vidioc_s_audio(struct file *file, void *priv,
const struct v4l2_audio *a)
{
struct em28xx *dev = video_drvdata(file);
int idx, i;
if (a->index >= MAX_EM28XX_INPUT)
return -EINVAL;
idx = dev->amux_map[a->index];
if (idx == EM28XX_AMUX_UNUSED)
return -EINVAL;
dev->ctl_ainput = idx;
/*
* FIXME: This is wrong, as different inputs at em28xx_cards
* may have different audio outputs. So, the right thing
* to do is to implement VIDIOC_G_AUDOUT/VIDIOC_S_AUDOUT.
* With the current board definitions, this would work fine,
* as, currently, all boards fit.
*/
for (i = 0; i < MAX_EM28XX_INPUT; i++)
if (idx == dev->amux_map[i])
break;
if (i == MAX_EM28XX_INPUT)
return -EINVAL;
dev->ctl_aoutput = INPUT(i)->aout;
if (!dev->ctl_aoutput)
dev->ctl_aoutput = EM28XX_AOUT_MASTER;
em28xx_videodbg("%s: set audio input to %d\n", __func__,
dev->ctl_ainput);
return 0;
}
static int vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *t)
{
struct em28xx *dev = video_drvdata(file);
if (t->index != 0)
return -EINVAL;
strscpy(t->name, "Tuner", sizeof(t->name));
v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, g_tuner, t);
return 0;
}
static int vidioc_s_tuner(struct file *file, void *priv,
const struct v4l2_tuner *t)
{
struct em28xx *dev = video_drvdata(file);
if (t->index != 0)
return -EINVAL;
v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, s_tuner, t);
return 0;
}
static int vidioc_g_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct em28xx *dev = video_drvdata(file);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
if (f->tuner != 0)
return -EINVAL;
f->frequency = v4l2->frequency;
return 0;
}
static int vidioc_s_frequency(struct file *file, void *priv,
const struct v4l2_frequency *f)
{
struct v4l2_frequency new_freq = *f;
struct em28xx *dev = video_drvdata(file);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
if (f->tuner != 0)
return -EINVAL;
v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, s_frequency, f);
v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, g_frequency, &new_freq);
v4l2->frequency = new_freq.frequency;
return 0;
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
static int vidioc_g_chip_info(struct file *file, void *priv,
struct v4l2_dbg_chip_info *chip)
{
struct em28xx *dev = video_drvdata(file);
if (chip->match.addr > 1)
return -EINVAL;
if (chip->match.addr == 1)
strscpy(chip->name, "ac97", sizeof(chip->name));
else
strscpy(chip->name,
dev->v4l2->v4l2_dev.name, sizeof(chip->name));
return 0;
}
static int em28xx_reg_len(int reg)
{
switch (reg) {
case EM28XX_R40_AC97LSB:
case EM28XX_R30_HSCALELOW:
case EM28XX_R32_VSCALELOW:
return 2;
default:
return 1;
}
}
static int vidioc_g_register(struct file *file, void *priv,
struct v4l2_dbg_register *reg)
{
struct em28xx *dev = video_drvdata(file);
int ret;
if (reg->match.addr > 1)
return -EINVAL;
if (reg->match.addr) {
ret = em28xx_read_ac97(dev, reg->reg);
if (ret < 0)
return ret;
reg->val = ret;
reg->size = 1;
return 0;
}
/* Match host */
reg->size = em28xx_reg_len(reg->reg);
if (reg->size == 1) {
ret = em28xx_read_reg(dev, reg->reg);
if (ret < 0)
return ret;
reg->val = ret;
} else {
__le16 val = 0;
ret = dev->em28xx_read_reg_req_len(dev, USB_REQ_GET_STATUS,
reg->reg, (char *)&val, 2);
if (ret < 0)
return ret;
reg->val = le16_to_cpu(val);
}
return 0;
}
static int vidioc_s_register(struct file *file, void *priv,
const struct v4l2_dbg_register *reg)
{
struct em28xx *dev = video_drvdata(file);
__le16 buf;
if (reg->match.addr > 1)
return -EINVAL;
if (reg->match.addr)
return em28xx_write_ac97(dev, reg->reg, reg->val);
/* Match host */
buf = cpu_to_le16(reg->val);
return em28xx_write_regs(dev, reg->reg, (char *)&buf,
em28xx_reg_len(reg->reg));
}
#endif
static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *cap)
{
struct em28xx *dev = video_drvdata(file);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
struct usb_device *udev = interface_to_usbdev(dev->intf);
strscpy(cap->driver, "em28xx", sizeof(cap->driver));
strscpy(cap->card, em28xx_boards[dev->model].name, sizeof(cap->card));
usb_make_path(udev, cap->bus_info, sizeof(cap->bus_info));
cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_READWRITE |
V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
if (dev->int_audio_type != EM28XX_INT_AUDIO_NONE)
cap->capabilities |= V4L2_CAP_AUDIO;
if (dev->tuner_type != TUNER_ABSENT)
cap->capabilities |= V4L2_CAP_TUNER;
if (video_is_registered(&v4l2->vbi_dev))
cap->capabilities |= V4L2_CAP_VBI_CAPTURE;
if (video_is_registered(&v4l2->radio_dev))
cap->capabilities |= V4L2_CAP_RADIO;
return 0;
}
static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_fmtdesc *f)
{
if (unlikely(f->index >= ARRAY_SIZE(format)))
return -EINVAL;
f->pixelformat = format[f->index].fourcc;
return 0;
}
static int vidioc_enum_framesizes(struct file *file, void *priv,
struct v4l2_frmsizeenum *fsize)
{
struct em28xx *dev = video_drvdata(file);
struct em28xx_fmt *fmt;
unsigned int maxw = norm_maxw(dev);
unsigned int maxh = norm_maxh(dev);
fmt = format_by_fourcc(fsize->pixel_format);
if (!fmt) {
em28xx_videodbg("Fourcc format (%08x) invalid.\n",
fsize->pixel_format);
return -EINVAL;
}
if (dev->board.is_em2800) {
if (fsize->index > 1)
return -EINVAL;
fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
fsize->discrete.width = maxw / (1 + fsize->index);
fsize->discrete.height = maxh / (1 + fsize->index);
return 0;
}
if (fsize->index != 0)
return -EINVAL;
/* Report a continuous range */
fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
scale_to_size(dev, EM28XX_HVSCALE_MAX, EM28XX_HVSCALE_MAX,
&fsize->stepwise.min_width, &fsize->stepwise.min_height);
if (fsize->stepwise.min_width < 48)
fsize->stepwise.min_width = 48;
if (fsize->stepwise.min_height < 38)
fsize->stepwise.min_height = 38;
fsize->stepwise.max_width = maxw;
fsize->stepwise.max_height = maxh;
fsize->stepwise.step_width = 1;
fsize->stepwise.step_height = 1;
return 0;
}
/* RAW VBI ioctls */
static int vidioc_g_fmt_vbi_cap(struct file *file, void *priv,
struct v4l2_format *format)
{
struct em28xx *dev = video_drvdata(file);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
format->fmt.vbi.samples_per_line = v4l2->vbi_width;
format->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
format->fmt.vbi.offset = 0;
format->fmt.vbi.flags = 0;
format->fmt.vbi.sampling_rate = 6750000 * 4 / 2;
format->fmt.vbi.count[0] = v4l2->vbi_height;
format->fmt.vbi.count[1] = v4l2->vbi_height;
memset(format->fmt.vbi.reserved, 0, sizeof(format->fmt.vbi.reserved));
/* Varies by video standard (NTSC, PAL, etc.) */
if (v4l2->norm & V4L2_STD_525_60) {
/* NTSC */
format->fmt.vbi.start[0] = 10;
format->fmt.vbi.start[1] = 273;
} else if (v4l2->norm & V4L2_STD_625_50) {
/* PAL */
format->fmt.vbi.start[0] = 6;
format->fmt.vbi.start[1] = 318;
}
return 0;
}
/*
* RADIO ESPECIFIC IOCTLS
*/
static int radio_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *t)
{
struct em28xx *dev = video_drvdata(file);
if (unlikely(t->index > 0))
return -EINVAL;
strscpy(t->name, "Radio", sizeof(t->name));
v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, g_tuner, t);
return 0;
}
static int radio_s_tuner(struct file *file, void *priv,
const struct v4l2_tuner *t)
{
struct em28xx *dev = video_drvdata(file);
if (t->index != 0)
return -EINVAL;
v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, s_tuner, t);
return 0;
}
/*
* em28xx_free_v4l2() - Free struct em28xx_v4l2
*
* @ref: struct kref for struct em28xx_v4l2
*
* Called when all users of struct em28xx_v4l2 are gone
*/
static void em28xx_free_v4l2(struct kref *ref)
{
struct em28xx_v4l2 *v4l2 = container_of(ref, struct em28xx_v4l2, ref);
v4l2->dev->v4l2 = NULL;
kfree(v4l2);
}
/*
* em28xx_v4l2_open()
* inits the device and starts isoc transfer
*/
static int em28xx_v4l2_open(struct file *filp)
{
struct video_device *vdev = video_devdata(filp);
struct em28xx *dev = video_drvdata(filp);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
enum v4l2_buf_type fh_type = 0;
int ret;
switch (vdev->vfl_type) {
case VFL_TYPE_VIDEO:
fh_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
break;
case VFL_TYPE_VBI:
fh_type = V4L2_BUF_TYPE_VBI_CAPTURE;
break;
case VFL_TYPE_RADIO:
break;
default:
return -EINVAL;
}
em28xx_videodbg("open dev=%s type=%s users=%d\n",
video_device_node_name(vdev), v4l2_type_names[fh_type],
v4l2->users);
if (mutex_lock_interruptible(&dev->lock))
return -ERESTARTSYS;
ret = v4l2_fh_open(filp);
if (ret) {
dev_err(&dev->intf->dev,
"%s: v4l2_fh_open() returned error %d\n",
__func__, ret);
mutex_unlock(&dev->lock);
return ret;
}
if (v4l2->users == 0) {
em28xx_set_mode(dev, EM28XX_ANALOG_MODE);
if (vdev->vfl_type != VFL_TYPE_RADIO)
em28xx_resolution_set(dev);
/*
* Needed, since GPIO might have disabled power
* of some i2c devices
*/
em28xx_wake_i2c(dev);
}
if (vdev->vfl_type == VFL_TYPE_RADIO) {
em28xx_videodbg("video_open: setting radio device\n");
v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, s_radio);
}
kref_get(&dev->ref);
kref_get(&v4l2->ref);
v4l2->users++;
mutex_unlock(&dev->lock);
return 0;
}
/*
* em28xx_v4l2_fini()
* unregisters the v4l2,i2c and usb devices
* called when the device gets disconnected or at module unload
*/
static int em28xx_v4l2_fini(struct em28xx *dev)
{
struct em28xx_v4l2 *v4l2 = dev->v4l2;
if (dev->is_audio_only) {
/* Shouldn't initialize IR for this interface */
return 0;
}
if (!dev->has_video) {
/* This device does not support the v4l2 extension */
return 0;
}
if (!v4l2)
return 0;
dev_info(&dev->intf->dev, "Closing video extension\n");
mutex_lock(&dev->lock);
v4l2_device_disconnect(&v4l2->v4l2_dev);
em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
em28xx_v4l2_media_release(dev);
if (video_is_registered(&v4l2->radio_dev)) {
dev_info(&dev->intf->dev, "V4L2 device %s deregistered\n",
video_device_node_name(&v4l2->radio_dev));
video_unregister_device(&v4l2->radio_dev);
}
if (video_is_registered(&v4l2->vbi_dev)) {
dev_info(&dev->intf->dev, "V4L2 device %s deregistered\n",
video_device_node_name(&v4l2->vbi_dev));
video_unregister_device(&v4l2->vbi_dev);
}
if (video_is_registered(&v4l2->vdev)) {
dev_info(&dev->intf->dev, "V4L2 device %s deregistered\n",
video_device_node_name(&v4l2->vdev));
video_unregister_device(&v4l2->vdev);
}
v4l2_ctrl_handler_free(&v4l2->ctrl_handler);
v4l2_device_unregister(&v4l2->v4l2_dev);
kref_put(&v4l2->ref, em28xx_free_v4l2);
mutex_unlock(&dev->lock);
kref_put(&dev->ref, em28xx_free_device);
return 0;
}
static int em28xx_v4l2_suspend(struct em28xx *dev)
{
if (dev->is_audio_only)
return 0;
if (!dev->has_video)
return 0;
dev_info(&dev->intf->dev, "Suspending video extension\n");
em28xx_stop_urbs(dev);
return 0;
}
static int em28xx_v4l2_resume(struct em28xx *dev)
{
if (dev->is_audio_only)
return 0;
if (!dev->has_video)
return 0;
dev_info(&dev->intf->dev, "Resuming video extension\n");
/* what do we do here */
return 0;
}
/*
* em28xx_v4l2_close()
* stops streaming and deallocates all resources allocated by the v4l2
* calls and ioctls
*/
static int em28xx_v4l2_close(struct file *filp)
{
struct em28xx *dev = video_drvdata(filp);
struct em28xx_v4l2 *v4l2 = dev->v4l2;
struct usb_device *udev = interface_to_usbdev(dev->intf);
int err;
em28xx_videodbg("users=%d\n", v4l2->users);
vb2_fop_release(filp);
mutex_lock(&dev->lock);
if (v4l2->users == 1) {
/* No sense to try to write to the device */
if (dev->disconnected)
goto exit;
/* Save some power by putting tuner to sleep */
v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, standby);
/* do this before setting alternate! */
em28xx_set_mode(dev, EM28XX_SUSPEND);
/* set alternate 0 */
dev->alt = 0;
em28xx_videodbg("setting alternate 0\n");
err = usb_set_interface(udev, 0, 0);
if (err < 0) {
dev_err(&dev->intf->dev,
"cannot change alternate number to 0 (error=%i)\n",
err);
}
}
exit:
v4l2->users--;
kref_put(&v4l2->ref, em28xx_free_v4l2);
mutex_unlock(&dev->lock);
kref_put(&dev->ref, em28xx_free_device);
return 0;
}
static const struct v4l2_file_operations em28xx_v4l_fops = {
.owner = THIS_MODULE,
.open = em28xx_v4l2_open,
.release = em28xx_v4l2_close,
.read = vb2_fop_read,
.poll = vb2_fop_poll,
.mmap = vb2_fop_mmap,
.unlocked_ioctl = video_ioctl2,
};
static const struct v4l2_ioctl_ops video_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_g_fmt_vbi_cap = vidioc_g_fmt_vbi_cap,
.vidioc_try_fmt_vbi_cap = vidioc_g_fmt_vbi_cap,
.vidioc_s_fmt_vbi_cap = vidioc_g_fmt_vbi_cap,
.vidioc_enum_framesizes = vidioc_enum_framesizes,
.vidioc_enumaudio = vidioc_enumaudio,
.vidioc_g_audio = vidioc_g_audio,
.vidioc_s_audio = vidioc_s_audio,
.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_g_std = vidioc_g_std,
.vidioc_querystd = vidioc_querystd,
.vidioc_s_std = vidioc_s_std,
.vidioc_g_parm = vidioc_g_parm,
.vidioc_s_parm = vidioc_s_parm,
.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_g_tuner = vidioc_g_tuner,
.vidioc_s_tuner = vidioc_s_tuner,
.vidioc_g_frequency = vidioc_g_frequency,
.vidioc_s_frequency = vidioc_s_frequency,
.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
#ifdef CONFIG_VIDEO_ADV_DEBUG
.vidioc_g_chip_info = vidioc_g_chip_info,
.vidioc_g_register = vidioc_g_register,
.vidioc_s_register = vidioc_s_register,
#endif
};
static const struct video_device em28xx_video_template = {
.fops = &em28xx_v4l_fops,
.ioctl_ops = &video_ioctl_ops,
.release = video_device_release_empty,
.tvnorms = V4L2_STD_ALL,
};
static const struct v4l2_file_operations radio_fops = {
.owner = THIS_MODULE,
.open = em28xx_v4l2_open,
.release = em28xx_v4l2_close,
.unlocked_ioctl = video_ioctl2,
};
static const struct v4l2_ioctl_ops radio_ioctl_ops = {
.vidioc_querycap = vidioc_querycap,
.vidioc_g_tuner = radio_g_tuner,
.vidioc_s_tuner = radio_s_tuner,
.vidioc_g_frequency = vidioc_g_frequency,
.vidioc_s_frequency = vidioc_s_frequency,
.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
#ifdef CONFIG_VIDEO_ADV_DEBUG
.vidioc_g_chip_info = vidioc_g_chip_info,
.vidioc_g_register = vidioc_g_register,
.vidioc_s_register = vidioc_s_register,
#endif
};
static struct video_device em28xx_radio_template = {
.fops = &radio_fops,
.ioctl_ops = &radio_ioctl_ops,
.release = video_device_release_empty,
};
/* I2C possible address to saa7115, tvp5150, msp3400, tvaudio */
static unsigned short saa711x_addrs[] = {
0x4a >> 1, 0x48 >> 1, /* SAA7111, SAA7111A and SAA7113 */
0x42 >> 1, 0x40 >> 1, /* SAA7114, SAA7115 and SAA7118 */
I2C_CLIENT_END };
static unsigned short tvp5150_addrs[] = {
0xb8 >> 1,
0xba >> 1,
I2C_CLIENT_END
};
static unsigned short msp3400_addrs[] = {
0x80 >> 1,
0x88 >> 1,
I2C_CLIENT_END
};
/******************************** usb interface ******************************/
static void em28xx_vdev_init(struct em28xx *dev,
struct video_device *vfd,
const struct video_device *template,
const char *type_name)
{
*vfd = *template;
vfd->v4l2_dev = &dev->v4l2->v4l2_dev;
vfd->lock = &dev->lock;
if (dev->is_webcam)
vfd->tvnorms = 0;
snprintf(vfd->name, sizeof(vfd->name), "%s %s",
dev_name(&dev->intf->dev), type_name);
video_set_drvdata(vfd, dev);
}
static void em28xx_tuner_setup(struct em28xx *dev, unsigned short tuner_addr)
{
struct em28xx_v4l2 *v4l2 = dev->v4l2;
struct v4l2_device *v4l2_dev = &v4l2->v4l2_dev;
struct tuner_setup tun_setup;
struct v4l2_frequency f;
memset(&tun_setup, 0, sizeof(tun_setup));
tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
tun_setup.tuner_callback = em28xx_tuner_callback;
if (dev->board.radio.type) {
tun_setup.type = dev->board.radio.type;
tun_setup.addr = dev->board.radio_addr;
v4l2_device_call_all(v4l2_dev,
0, tuner, s_type_addr, &tun_setup);
}
if (dev->tuner_type != TUNER_ABSENT && dev->tuner_type) {
tun_setup.type = dev->tuner_type;
tun_setup.addr = tuner_addr;
v4l2_device_call_all(v4l2_dev,
0, tuner, s_type_addr, &tun_setup);
}
if (dev->board.tda9887_conf) {
struct v4l2_priv_tun_config tda9887_cfg;
tda9887_cfg.tuner = TUNER_TDA9887;
tda9887_cfg.priv = &dev->board.tda9887_conf;
v4l2_device_call_all(v4l2_dev,
0, tuner, s_config, &tda9887_cfg);
}
if (dev->tuner_type == TUNER_XC2028) {
struct v4l2_priv_tun_config xc2028_cfg;
struct xc2028_ctrl ctl;
memset(&xc2028_cfg, 0, sizeof(xc2028_cfg));
memset(&ctl, 0, sizeof(ctl));
em28xx_setup_xc3028(dev, &ctl);
xc2028_cfg.tuner = TUNER_XC2028;
xc2028_cfg.priv = &ctl;
v4l2_device_call_all(v4l2_dev, 0, tuner, s_config, &xc2028_cfg);
}
/* configure tuner */
f.tuner = 0;
f.type = V4L2_TUNER_ANALOG_TV;
f.frequency = 9076; /* just a magic number */
v4l2->frequency = f.frequency;
v4l2_device_call_all(v4l2_dev, 0, tuner, s_frequency, &f);
}
static int em28xx_v4l2_init(struct em28xx *dev)
{
u8 val;
int ret;
unsigned int maxw;
struct v4l2_ctrl_handler *hdl;
struct em28xx_v4l2 *v4l2;
if (dev->is_audio_only) {
/* Shouldn't initialize IR for this interface */
return 0;
}
if (!dev->has_video) {
/* This device does not support the v4l2 extension */
return 0;
}
dev_info(&dev->intf->dev, "Registering V4L2 extension\n");
mutex_lock(&dev->lock);
v4l2 = kzalloc(sizeof(*v4l2), GFP_KERNEL);
if (!v4l2) {
mutex_unlock(&dev->lock);
return -ENOMEM;
}
kref_init(&v4l2->ref);
v4l2->dev = dev;
dev->v4l2 = v4l2;
#ifdef CONFIG_MEDIA_CONTROLLER
v4l2->v4l2_dev.mdev = dev->media_dev;
#endif
ret = v4l2_device_register(&dev->intf->dev, &v4l2->v4l2_dev);
if (ret < 0) {
dev_err(&dev->intf->dev,
"Call to v4l2_device_register() failed!\n");
goto err;
}
hdl = &v4l2->ctrl_handler;
v4l2_ctrl_handler_init(hdl, 8);
v4l2->v4l2_dev.ctrl_handler = hdl;
if (dev->is_webcam)
v4l2->progressive = true;
/*
* Default format, used for tvp5150 or saa711x output formats
*/
v4l2->vinmode = EM28XX_VINMODE_YUV422_CbYCrY;
v4l2->vinctl = EM28XX_VINCTRL_INTERLACED |
EM28XX_VINCTRL_CCIR656_ENABLE;
/* request some modules */
if (dev->has_msp34xx)
v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
&dev->i2c_adap[dev->def_i2c_bus],
"msp3400", 0, msp3400_addrs);
if (dev->board.decoder == EM28XX_SAA711X)
v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
&dev->i2c_adap[dev->def_i2c_bus],
"saa7115_auto", 0, saa711x_addrs);
if (dev->board.decoder == EM28XX_TVP5150)
v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
&dev->i2c_adap[dev->def_i2c_bus],
"tvp5150", 0, tvp5150_addrs);
if (dev->board.adecoder == EM28XX_TVAUDIO)
v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
&dev->i2c_adap[dev->def_i2c_bus],
"tvaudio", dev->board.tvaudio_addr, NULL);
/* Initialize tuner and camera */
if (dev->board.tuner_type != TUNER_ABSENT) {
unsigned short tuner_addr = dev->board.tuner_addr;
int has_demod = (dev->board.tda9887_conf & TDA9887_PRESENT);
if (dev->board.radio.type)
v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
&dev->i2c_adap[dev->def_i2c_bus],
"tuner", dev->board.radio_addr,
NULL);
if (has_demod)
v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
&dev->i2c_adap[dev->def_i2c_bus],
"tuner", 0,
v4l2_i2c_tuner_addrs(ADDRS_DEMOD));
if (tuner_addr == 0) {
enum v4l2_i2c_tuner_type type =
has_demod ? ADDRS_TV_WITH_DEMOD : ADDRS_TV;
struct v4l2_subdev *sd;
sd = v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
&dev->i2c_adap[dev->def_i2c_bus],
"tuner", 0,
v4l2_i2c_tuner_addrs(type));
if (sd)
tuner_addr = v4l2_i2c_subdev_addr(sd);
} else {
v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
&dev->i2c_adap[dev->def_i2c_bus],
"tuner", tuner_addr, NULL);
}
em28xx_tuner_setup(dev, tuner_addr);
}
if (dev->em28xx_sensor != EM28XX_NOSENSOR)
em28xx_init_camera(dev);
/* Configure audio */
ret = em28xx_audio_setup(dev);
if (ret < 0) {
dev_err(&dev->intf->dev,
"%s: Error while setting audio - error [%d]!\n",
__func__, ret);
goto unregister_dev;
}
if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
V4L2_CID_AUDIO_VOLUME, 0, 0x1f, 1, 0x1f);
} else {
/* install the em28xx notify callback */
v4l2_ctrl_notify(v4l2_ctrl_find(hdl, V4L2_CID_AUDIO_MUTE),
em28xx_ctrl_notify, dev);
v4l2_ctrl_notify(v4l2_ctrl_find(hdl, V4L2_CID_AUDIO_VOLUME),
em28xx_ctrl_notify, dev);
}
/* wake i2c devices */
em28xx_wake_i2c(dev);
/* init video dma queues */
INIT_LIST_HEAD(&dev->vidq.active);
INIT_LIST_HEAD(&dev->vbiq.active);
if (dev->has_msp34xx) {
/* Send a reset to other chips via gpio */
ret = em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xf7);
if (ret < 0) {
dev_err(&dev->intf->dev,
"%s: em28xx_write_reg - msp34xx(1) failed! error [%d]\n",
__func__, ret);
goto unregister_dev;
}
usleep_range(10000, 11000);
ret = em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xff);
if (ret < 0) {
dev_err(&dev->intf->dev,
"%s: em28xx_write_reg - msp34xx(2) failed! error [%d]\n",
__func__, ret);
goto unregister_dev;
}
usleep_range(10000, 11000);
}
/* set default norm */
v4l2->norm = V4L2_STD_PAL;
v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_std, v4l2->norm);
v4l2->interlaced_fieldmode = EM28XX_INTERLACED_DEFAULT;
/* Analog specific initialization */
v4l2->format = &format[0];
maxw = norm_maxw(dev);
/*
* MaxPacketSize for em2800 is too small to capture at full resolution
* use half of maxw as the scaler can only scale to 50%
*/
if (dev->board.is_em2800)
maxw /= 2;
em28xx_set_video_format(dev, format[0].fourcc,
maxw, norm_maxh(dev));
video_mux(dev, 0);
/* Audio defaults */
dev->mute = 1;
dev->volume = 0x1f;
/* em28xx_write_reg(dev, EM28XX_R0E_AUDIOSRC, 0xc0); audio register */
val = (u8)em28xx_read_reg(dev, EM28XX_R0F_XCLK);
em28xx_write_reg(dev, EM28XX_R0F_XCLK,
(EM28XX_XCLK_AUDIO_UNMUTE | val));
em28xx_set_outfmt(dev);
/* Add image controls */
/*
* NOTE: at this point, the subdevices are already registered, so
* bridge controls are only added/enabled when no subdevice provides
* them
*/
if (!v4l2_ctrl_find(hdl, V4L2_CID_CONTRAST))
v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
V4L2_CID_CONTRAST,
0, 0x1f, 1, CONTRAST_DEFAULT);
if (!v4l2_ctrl_find(hdl, V4L2_CID_BRIGHTNESS))
v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
V4L2_CID_BRIGHTNESS,
-0x80, 0x7f, 1, BRIGHTNESS_DEFAULT);
if (!v4l2_ctrl_find(hdl, V4L2_CID_SATURATION))
v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
V4L2_CID_SATURATION,
0, 0x1f, 1, SATURATION_DEFAULT);
if (!v4l2_ctrl_find(hdl, V4L2_CID_BLUE_BALANCE))
v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
V4L2_CID_BLUE_BALANCE,
-0x30, 0x30, 1, BLUE_BALANCE_DEFAULT);
if (!v4l2_ctrl_find(hdl, V4L2_CID_RED_BALANCE))
v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
V4L2_CID_RED_BALANCE,
-0x30, 0x30, 1, RED_BALANCE_DEFAULT);
if (!v4l2_ctrl_find(hdl, V4L2_CID_SHARPNESS))
v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
V4L2_CID_SHARPNESS,
0, 0x0f, 1, SHARPNESS_DEFAULT);
/* Reset image controls */
em28xx_colorlevels_set_default(dev);
v4l2_ctrl_handler_setup(hdl);
ret = hdl->error;
if (ret)
goto unregister_dev;
/* allocate and fill video video_device struct */
em28xx_vdev_init(dev, &v4l2->vdev, &em28xx_video_template, "video");
mutex_init(&v4l2->vb_queue_lock);
mutex_init(&v4l2->vb_vbi_queue_lock);
v4l2->vdev.queue = &v4l2->vb_vidq;
v4l2->vdev.queue->lock = &v4l2->vb_queue_lock;
v4l2->vdev.device_caps = V4L2_CAP_READWRITE | V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_STREAMING;
if (dev->int_audio_type != EM28XX_INT_AUDIO_NONE)
v4l2->vdev.device_caps |= V4L2_CAP_AUDIO;
if (dev->tuner_type != TUNER_ABSENT)
v4l2->vdev.device_caps |= V4L2_CAP_TUNER;
/* disable inapplicable ioctls */
if (dev->is_webcam) {
v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_QUERYSTD);
v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_STD);
v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_STD);
} else {
v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_PARM);
}
if (dev->tuner_type == TUNER_ABSENT) {
v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_TUNER);
v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_TUNER);
v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_FREQUENCY);
v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_FREQUENCY);
}
if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE) {
v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_AUDIO);
v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_AUDIO);
}
/* register v4l2 video video_device */
ret = video_register_device(&v4l2->vdev, VFL_TYPE_VIDEO,
video_nr[dev->devno]);
if (ret) {
dev_err(&dev->intf->dev,
"unable to register video device (error=%i).\n", ret);
goto unregister_dev;
}
/* Allocate and fill vbi video_device struct */
if (em28xx_vbi_supported(dev) == 1) {
em28xx_vdev_init(dev, &v4l2->vbi_dev, &em28xx_video_template,
"vbi");
v4l2->vbi_dev.queue = &v4l2->vb_vbiq;
v4l2->vbi_dev.queue->lock = &v4l2->vb_vbi_queue_lock;
v4l2->vbi_dev.device_caps = V4L2_CAP_STREAMING |
V4L2_CAP_READWRITE | V4L2_CAP_VBI_CAPTURE;
if (dev->tuner_type != TUNER_ABSENT)
v4l2->vbi_dev.device_caps |= V4L2_CAP_TUNER;
/* disable inapplicable ioctls */
v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_S_PARM);
if (dev->tuner_type == TUNER_ABSENT) {
v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_G_TUNER);
v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_S_TUNER);
v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_G_FREQUENCY);
v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_S_FREQUENCY);
}
if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE) {
v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_G_AUDIO);
v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_S_AUDIO);
}
/* register v4l2 vbi video_device */
ret = video_register_device(&v4l2->vbi_dev, VFL_TYPE_VBI,
vbi_nr[dev->devno]);
if (ret < 0) {
dev_err(&dev->intf->dev,
"unable to register vbi device\n");
goto unregister_dev;
}
}
if (em28xx_boards[dev->model].radio.type == EM28XX_RADIO) {
em28xx_vdev_init(dev, &v4l2->radio_dev, &em28xx_radio_template,
"radio");
v4l2->radio_dev.device_caps = V4L2_CAP_RADIO | V4L2_CAP_TUNER;
ret = video_register_device(&v4l2->radio_dev, VFL_TYPE_RADIO,
radio_nr[dev->devno]);
if (ret < 0) {
dev_err(&dev->intf->dev,
"can't register radio device\n");
goto unregister_dev;
}
dev_info(&dev->intf->dev,
"Registered radio device as %s\n",
video_device_node_name(&v4l2->radio_dev));
}
/* Init entities at the Media Controller */
em28xx_v4l2_create_entities(dev);
#ifdef CONFIG_MEDIA_CONTROLLER
ret = v4l2_mc_create_media_graph(dev->media_dev);
if (ret) {
dev_err(&dev->intf->dev,
"failed to create media graph\n");
em28xx_v4l2_media_release(dev);
goto unregister_dev;
}
#endif
dev_info(&dev->intf->dev,
"V4L2 video device registered as %s\n",
video_device_node_name(&v4l2->vdev));
if (video_is_registered(&v4l2->vbi_dev))
dev_info(&dev->intf->dev,
"V4L2 VBI device registered as %s\n",
video_device_node_name(&v4l2->vbi_dev));
/* Save some power by putting tuner to sleep */
v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, standby);
/* initialize videobuf2 stuff */
em28xx_vb2_setup(dev);
dev_info(&dev->intf->dev,
"V4L2 extension successfully initialized\n");
kref_get(&dev->ref);
mutex_unlock(&dev->lock);
return 0;
unregister_dev:
if (video_is_registered(&v4l2->radio_dev)) {
dev_info(&dev->intf->dev,
"V4L2 device %s deregistered\n",
video_device_node_name(&v4l2->radio_dev));
video_unregister_device(&v4l2->radio_dev);
}
if (video_is_registered(&v4l2->vbi_dev)) {
dev_info(&dev->intf->dev,
"V4L2 device %s deregistered\n",
video_device_node_name(&v4l2->vbi_dev));
video_unregister_device(&v4l2->vbi_dev);
}
if (video_is_registered(&v4l2->vdev)) {
dev_info(&dev->intf->dev,
"V4L2 device %s deregistered\n",
video_device_node_name(&v4l2->vdev));
video_unregister_device(&v4l2->vdev);
}
v4l2_ctrl_handler_free(&v4l2->ctrl_handler);
v4l2_device_unregister(&v4l2->v4l2_dev);
err:
dev->v4l2 = NULL;
kref_put(&v4l2->ref, em28xx_free_v4l2);
mutex_unlock(&dev->lock);
return ret;
}
static struct em28xx_ops v4l2_ops = {
.id = EM28XX_V4L2,
.name = "Em28xx v4l2 Extension",
.init = em28xx_v4l2_init,
.fini = em28xx_v4l2_fini,
.suspend = em28xx_v4l2_suspend,
.resume = em28xx_v4l2_resume,
};
static int __init em28xx_video_register(void)
{
return em28xx_register_extension(&v4l2_ops);
}
static void __exit em28xx_video_unregister(void)
{
em28xx_unregister_extension(&v4l2_ops);
}
module_init(em28xx_video_register);
module_exit(em28xx_video_unregister);