forked from luck/tmp_suning_uos_patched
[media] add raw video stream support for Samsung SUR40
This patch adds raw video support for the Samsung SUR40 using vbuf2-dma-sg. All tests from v4l2-compliance pass. Support for VB2_USERPTR is currently disabled due to unexpected interference with dma-sg buffer sizes. Signed-off-by: Florian Echtler <floe@butterbrot.org> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> [hans.verkuil@cisco.com: fix compile warning: %ld -> %zd] Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
parent
5f85348732
commit
e831cd251f
@ -953,7 +953,9 @@ config TOUCHSCREEN_SUN4I
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config TOUCHSCREEN_SUR40
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tristate "Samsung SUR40 (Surface 2.0/PixelSense) touchscreen"
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depends on USB
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depends on MEDIA_USB_SUPPORT
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select INPUT_POLLDEV
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select VIDEOBUF2_DMA_SG
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help
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Say Y here if you want support for the Samsung SUR40 touchscreen
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(also known as Microsoft Surface 2.0 or Microsoft PixelSense).
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@ -1,7 +1,7 @@
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/*
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* Surface2.0/SUR40/PixelSense input driver
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*
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* Copyright (c) 2013 by Florian 'floe' Echtler <floe@butterbrot.org>
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* Copyright (c) 2014 by Florian 'floe' Echtler <floe@butterbrot.org>
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*
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* Derived from the USB Skeleton driver 1.1,
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* Copyright (c) 2003 Greg Kroah-Hartman (greg@kroah.com)
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@ -12,6 +12,9 @@
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* and from the generic hid-multitouch driver,
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* Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
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*
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* and from the v4l2-pci-skeleton driver,
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* Copyright (c) Copyright 2014 Cisco Systems, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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@ -31,6 +34,11 @@
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#include <linux/input-polldev.h>
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#include <linux/input/mt.h>
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#include <linux/usb/input.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-dev.h>
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#include <media/v4l2-ioctl.h>
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#include <media/videobuf2-dma-sg.h>
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/* read 512 bytes from endpoint 0x86 -> get header + blobs */
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struct sur40_header {
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@ -82,9 +90,19 @@ struct sur40_data {
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struct sur40_blob blobs[];
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} __packed;
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/* read 512 bytes from endpoint 0x82 -> get header below
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* continue reading 16k blocks until header.size bytes read */
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struct sur40_image_header {
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__le32 magic; /* "SUBF" */
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__le32 packet_id;
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__le32 size; /* always 0x0007e900 = 960x540 */
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__le32 timestamp; /* milliseconds (increases by 16 or 17 each frame) */
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__le32 unknown; /* "epoch?" always 02/03 00 00 00 */
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} __packed;
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/* version information */
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#define DRIVER_SHORT "sur40"
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#define DRIVER_LONG "Samsung SUR40"
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#define DRIVER_AUTHOR "Florian 'floe' Echtler <floe@butterbrot.org>"
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#define DRIVER_DESC "Surface2.0/SUR40/PixelSense input driver"
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@ -99,6 +117,13 @@ struct sur40_data {
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/* touch data endpoint */
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#define TOUCH_ENDPOINT 0x86
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/* video data endpoint */
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#define VIDEO_ENDPOINT 0x82
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/* video header fields */
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#define VIDEO_HEADER_MAGIC 0x46425553
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#define VIDEO_PACKET_SIZE 16384
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/* polling interval (ms) */
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#define POLL_INTERVAL 10
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@ -113,6 +138,41 @@ struct sur40_data {
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#define SUR40_GET_STATE 0xc5 /* 4 bytes state (?) */
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#define SUR40_GET_SENSORS 0xb1 /* 8 bytes sensors */
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/* master device state */
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struct sur40_state {
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struct usb_device *usbdev;
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struct device *dev;
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struct input_polled_dev *input;
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struct v4l2_device v4l2;
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struct video_device vdev;
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struct mutex lock;
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struct vb2_queue queue;
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struct vb2_alloc_ctx *alloc_ctx;
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struct list_head buf_list;
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spinlock_t qlock;
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int sequence;
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struct sur40_data *bulk_in_buffer;
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size_t bulk_in_size;
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u8 bulk_in_epaddr;
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char phys[64];
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};
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struct sur40_buffer {
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struct vb2_buffer vb;
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struct list_head list;
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};
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/* forward declarations */
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static const struct video_device sur40_video_device;
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static const struct v4l2_pix_format sur40_video_format;
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static const struct vb2_queue sur40_queue;
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static void sur40_process_video(struct sur40_state *sur40);
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/*
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* Note: an earlier, non-public version of this driver used USB_RECIP_ENDPOINT
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* here by mistake which is very likely to have corrupted the firmware EEPROM
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@ -122,19 +182,7 @@ struct sur40_data {
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* at https://floe.butterbrot.org/matrix/hacking/surface/brick.html
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*/
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struct sur40_state {
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struct usb_device *usbdev;
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struct device *dev;
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struct input_polled_dev *input;
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struct sur40_data *bulk_in_buffer;
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size_t bulk_in_size;
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u8 bulk_in_epaddr;
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char phys[64];
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};
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/* command wrapper */
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static int sur40_command(struct sur40_state *dev,
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u8 command, u16 index, void *buffer, u16 size)
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{
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@ -247,7 +295,6 @@ static void sur40_report_blob(struct sur40_blob *blob, struct input_dev *input)
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/* core function: poll for new input data */
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static void sur40_poll(struct input_polled_dev *polldev)
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{
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struct sur40_state *sur40 = polldev->private;
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struct input_dev *input = polldev->input;
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int result, bulk_read, need_blobs, packet_blobs, i;
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@ -314,6 +361,81 @@ static void sur40_poll(struct input_polled_dev *polldev)
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input_mt_sync_frame(input);
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input_sync(input);
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sur40_process_video(sur40);
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}
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/* deal with video data */
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static void sur40_process_video(struct sur40_state *sur40)
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{
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struct sur40_image_header *img = (void *)(sur40->bulk_in_buffer);
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struct sur40_buffer *new_buf;
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struct usb_sg_request sgr;
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struct sg_table *sgt;
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int result, bulk_read;
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if (!vb2_start_streaming_called(&sur40->queue))
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return;
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/* get a new buffer from the list */
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spin_lock(&sur40->qlock);
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new_buf = list_entry(sur40->buf_list.next, struct sur40_buffer, list);
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list_del(&new_buf->list);
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spin_unlock(&sur40->qlock);
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/* retrieve data via bulk read */
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result = usb_bulk_msg(sur40->usbdev,
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usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT),
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sur40->bulk_in_buffer, sur40->bulk_in_size,
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&bulk_read, 1000);
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if (result < 0) {
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dev_err(sur40->dev, "error in usb_bulk_read\n");
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goto err_poll;
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}
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if (bulk_read != sizeof(struct sur40_image_header)) {
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dev_err(sur40->dev, "received %d bytes (%zd expected)\n",
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bulk_read, sizeof(struct sur40_image_header));
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goto err_poll;
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}
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if (le32_to_cpu(img->magic) != VIDEO_HEADER_MAGIC) {
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dev_err(sur40->dev, "image magic mismatch\n");
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goto err_poll;
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}
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if (le32_to_cpu(img->size) != sur40_video_format.sizeimage) {
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dev_err(sur40->dev, "image size mismatch\n");
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goto err_poll;
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}
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sgt = vb2_dma_sg_plane_desc(&new_buf->vb, 0);
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result = usb_sg_init(&sgr, sur40->usbdev,
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usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT), 0,
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sgt->sgl, sgt->nents, sur40_video_format.sizeimage, 0);
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if (result < 0) {
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dev_err(sur40->dev, "error %d in usb_sg_init\n", result);
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goto err_poll;
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}
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usb_sg_wait(&sgr);
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if (sgr.status < 0) {
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dev_err(sur40->dev, "error %d in usb_sg_wait\n", sgr.status);
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goto err_poll;
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}
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/* mark as finished */
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v4l2_get_timestamp(&new_buf->vb.v4l2_buf.timestamp);
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new_buf->vb.v4l2_buf.sequence = sur40->sequence++;
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new_buf->vb.v4l2_buf.field = V4L2_FIELD_NONE;
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vb2_buffer_done(&new_buf->vb, VB2_BUF_STATE_DONE);
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return;
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err_poll:
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vb2_buffer_done(&new_buf->vb, VB2_BUF_STATE_ERROR);
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}
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/* Initialize input device parameters. */
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@ -377,6 +499,11 @@ static int sur40_probe(struct usb_interface *interface,
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goto err_free_dev;
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}
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/* initialize locks/lists */
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INIT_LIST_HEAD(&sur40->buf_list);
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spin_lock_init(&sur40->qlock);
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mutex_init(&sur40->lock);
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/* Set up polled input device control structure */
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poll_dev->private = sur40;
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poll_dev->poll_interval = POLL_INTERVAL;
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@ -387,7 +514,7 @@ static int sur40_probe(struct usb_interface *interface,
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/* Set up regular input device structure */
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sur40_input_setup(poll_dev->input);
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poll_dev->input->name = "Samsung SUR40";
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poll_dev->input->name = DRIVER_LONG;
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usb_to_input_id(usbdev, &poll_dev->input->id);
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usb_make_path(usbdev, sur40->phys, sizeof(sur40->phys));
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strlcat(sur40->phys, "/input0", sizeof(sur40->phys));
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@ -408,6 +535,7 @@ static int sur40_probe(struct usb_interface *interface,
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goto err_free_polldev;
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}
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/* register the polled input device */
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error = input_register_polled_device(poll_dev);
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if (error) {
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dev_err(&interface->dev,
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@ -415,12 +543,54 @@ static int sur40_probe(struct usb_interface *interface,
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goto err_free_buffer;
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}
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/* register the video master device */
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snprintf(sur40->v4l2.name, sizeof(sur40->v4l2.name), "%s", DRIVER_LONG);
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error = v4l2_device_register(sur40->dev, &sur40->v4l2);
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if (error) {
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dev_err(&interface->dev,
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"Unable to register video master device.");
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goto err_unreg_v4l2;
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}
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/* initialize the lock and subdevice */
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sur40->queue = sur40_queue;
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sur40->queue.drv_priv = sur40;
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sur40->queue.lock = &sur40->lock;
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/* initialize the queue */
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error = vb2_queue_init(&sur40->queue);
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if (error)
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goto err_unreg_v4l2;
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sur40->alloc_ctx = vb2_dma_sg_init_ctx(sur40->dev);
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if (IS_ERR(sur40->alloc_ctx)) {
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dev_err(sur40->dev, "Can't allocate buffer context");
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goto err_unreg_v4l2;
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}
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sur40->vdev = sur40_video_device;
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sur40->vdev.v4l2_dev = &sur40->v4l2;
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sur40->vdev.lock = &sur40->lock;
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sur40->vdev.queue = &sur40->queue;
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video_set_drvdata(&sur40->vdev, sur40);
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error = video_register_device(&sur40->vdev, VFL_TYPE_GRABBER, -1);
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if (error) {
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dev_err(&interface->dev,
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"Unable to register video subdevice.");
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goto err_unreg_video;
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}
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/* we can register the device now, as it is ready */
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usb_set_intfdata(interface, sur40);
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dev_dbg(&interface->dev, "%s is now attached\n", DRIVER_DESC);
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return 0;
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err_unreg_video:
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video_unregister_device(&sur40->vdev);
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err_unreg_v4l2:
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v4l2_device_unregister(&sur40->v4l2);
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err_free_buffer:
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kfree(sur40->bulk_in_buffer);
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err_free_polldev:
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@ -436,6 +606,10 @@ static void sur40_disconnect(struct usb_interface *interface)
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{
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struct sur40_state *sur40 = usb_get_intfdata(interface);
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video_unregister_device(&sur40->vdev);
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v4l2_device_unregister(&sur40->v4l2);
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vb2_dma_sg_cleanup_ctx(sur40->alloc_ctx);
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input_unregister_polled_device(sur40->input);
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input_free_polled_device(sur40->input);
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kfree(sur40->bulk_in_buffer);
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@ -445,12 +619,243 @@ static void sur40_disconnect(struct usb_interface *interface)
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dev_dbg(&interface->dev, "%s is now disconnected\n", DRIVER_DESC);
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}
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/*
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* Setup the constraints of the queue: besides setting the number of planes
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* per buffer and the size and allocation context of each plane, it also
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* checks if sufficient buffers have been allocated. Usually 3 is a good
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* minimum number: many DMA engines need a minimum of 2 buffers in the
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* queue and you need to have another available for userspace processing.
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*/
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static int sur40_queue_setup(struct vb2_queue *q, const struct v4l2_format *fmt,
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unsigned int *nbuffers, unsigned int *nplanes,
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unsigned int sizes[], void *alloc_ctxs[])
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{
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struct sur40_state *sur40 = vb2_get_drv_priv(q);
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if (q->num_buffers + *nbuffers < 3)
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*nbuffers = 3 - q->num_buffers;
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if (fmt && fmt->fmt.pix.sizeimage < sur40_video_format.sizeimage)
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return -EINVAL;
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*nplanes = 1;
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sizes[0] = fmt ? fmt->fmt.pix.sizeimage : sur40_video_format.sizeimage;
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alloc_ctxs[0] = sur40->alloc_ctx;
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return 0;
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}
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/*
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* Prepare the buffer for queueing to the DMA engine: check and set the
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* payload size.
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*/
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static int sur40_buffer_prepare(struct vb2_buffer *vb)
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{
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struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
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unsigned long size = sur40_video_format.sizeimage;
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if (vb2_plane_size(vb, 0) < size) {
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dev_err(&sur40->usbdev->dev, "buffer too small (%lu < %lu)\n",
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vb2_plane_size(vb, 0), size);
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return -EINVAL;
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}
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vb2_set_plane_payload(vb, 0, size);
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return 0;
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}
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/*
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* Queue this buffer to the DMA engine.
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*/
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static void sur40_buffer_queue(struct vb2_buffer *vb)
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{
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struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
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struct sur40_buffer *buf = (struct sur40_buffer *)vb;
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spin_lock(&sur40->qlock);
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list_add_tail(&buf->list, &sur40->buf_list);
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spin_unlock(&sur40->qlock);
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}
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static void return_all_buffers(struct sur40_state *sur40,
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enum vb2_buffer_state state)
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{
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struct sur40_buffer *buf, *node;
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spin_lock(&sur40->qlock);
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list_for_each_entry_safe(buf, node, &sur40->buf_list, list) {
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vb2_buffer_done(&buf->vb, state);
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list_del(&buf->list);
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}
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spin_unlock(&sur40->qlock);
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}
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/*
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* Start streaming. First check if the minimum number of buffers have been
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* queued. If not, then return -ENOBUFS and the vb2 framework will call
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* this function again the next time a buffer has been queued until enough
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* buffers are available to actually start the DMA engine.
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*/
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static int sur40_start_streaming(struct vb2_queue *vq, unsigned int count)
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{
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struct sur40_state *sur40 = vb2_get_drv_priv(vq);
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sur40->sequence = 0;
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return 0;
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}
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/*
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* Stop the DMA engine. Any remaining buffers in the DMA queue are dequeued
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* and passed on to the vb2 framework marked as STATE_ERROR.
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*/
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static void sur40_stop_streaming(struct vb2_queue *vq)
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{
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struct sur40_state *sur40 = vb2_get_drv_priv(vq);
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/* Release all active buffers */
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return_all_buffers(sur40, VB2_BUF_STATE_ERROR);
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}
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/* V4L ioctl */
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static int sur40_vidioc_querycap(struct file *file, void *priv,
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struct v4l2_capability *cap)
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{
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struct sur40_state *sur40 = video_drvdata(file);
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strlcpy(cap->driver, DRIVER_SHORT, sizeof(cap->driver));
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strlcpy(cap->card, DRIVER_LONG, sizeof(cap->card));
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usb_make_path(sur40->usbdev, cap->bus_info, sizeof(cap->bus_info));
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cap->device_caps = V4L2_CAP_VIDEO_CAPTURE |
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V4L2_CAP_READWRITE |
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V4L2_CAP_STREAMING;
|
||||
cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sur40_vidioc_enum_input(struct file *file, void *priv,
|
||||
struct v4l2_input *i)
|
||||
{
|
||||
if (i->index != 0)
|
||||
return -EINVAL;
|
||||
i->type = V4L2_INPUT_TYPE_CAMERA;
|
||||
i->std = V4L2_STD_UNKNOWN;
|
||||
strlcpy(i->name, "In-Cell Sensor", sizeof(i->name));
|
||||
i->capabilities = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sur40_vidioc_s_input(struct file *file, void *priv, unsigned int i)
|
||||
{
|
||||
return (i == 0) ? 0 : -EINVAL;
|
||||
}
|
||||
|
||||
static int sur40_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
|
||||
{
|
||||
*i = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sur40_vidioc_fmt(struct file *file, void *priv,
|
||||
struct v4l2_format *f)
|
||||
{
|
||||
f->fmt.pix = sur40_video_format;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sur40_vidioc_enum_fmt(struct file *file, void *priv,
|
||||
struct v4l2_fmtdesc *f)
|
||||
{
|
||||
if (f->index != 0)
|
||||
return -EINVAL;
|
||||
strlcpy(f->description, "8-bit greyscale", sizeof(f->description));
|
||||
f->pixelformat = V4L2_PIX_FMT_GREY;
|
||||
f->flags = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct usb_device_id sur40_table[] = {
|
||||
{ USB_DEVICE(ID_MICROSOFT, ID_SUR40) }, /* Samsung SUR40 */
|
||||
{ } /* terminating null entry */
|
||||
};
|
||||
MODULE_DEVICE_TABLE(usb, sur40_table);
|
||||
|
||||
/* V4L2 structures */
|
||||
static const struct vb2_ops sur40_queue_ops = {
|
||||
.queue_setup = sur40_queue_setup,
|
||||
.buf_prepare = sur40_buffer_prepare,
|
||||
.buf_queue = sur40_buffer_queue,
|
||||
.start_streaming = sur40_start_streaming,
|
||||
.stop_streaming = sur40_stop_streaming,
|
||||
.wait_prepare = vb2_ops_wait_prepare,
|
||||
.wait_finish = vb2_ops_wait_finish,
|
||||
};
|
||||
|
||||
static const struct vb2_queue sur40_queue = {
|
||||
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
|
||||
/*
|
||||
* VB2_USERPTR in currently not enabled: passing a user pointer to
|
||||
* dma-sg will result in segment sizes that are not a multiple of
|
||||
* 512 bytes, which is required by the host controller.
|
||||
*/
|
||||
.io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF,
|
||||
.buf_struct_size = sizeof(struct sur40_buffer),
|
||||
.ops = &sur40_queue_ops,
|
||||
.mem_ops = &vb2_dma_sg_memops,
|
||||
.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC,
|
||||
.min_buffers_needed = 3,
|
||||
};
|
||||
|
||||
static const struct v4l2_file_operations sur40_video_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.open = v4l2_fh_open,
|
||||
.release = vb2_fop_release,
|
||||
.unlocked_ioctl = video_ioctl2,
|
||||
.read = vb2_fop_read,
|
||||
.mmap = vb2_fop_mmap,
|
||||
.poll = vb2_fop_poll,
|
||||
};
|
||||
|
||||
static const struct v4l2_ioctl_ops sur40_video_ioctl_ops = {
|
||||
|
||||
.vidioc_querycap = sur40_vidioc_querycap,
|
||||
|
||||
.vidioc_enum_fmt_vid_cap = sur40_vidioc_enum_fmt,
|
||||
.vidioc_try_fmt_vid_cap = sur40_vidioc_fmt,
|
||||
.vidioc_s_fmt_vid_cap = sur40_vidioc_fmt,
|
||||
.vidioc_g_fmt_vid_cap = sur40_vidioc_fmt,
|
||||
|
||||
.vidioc_enum_input = sur40_vidioc_enum_input,
|
||||
.vidioc_g_input = sur40_vidioc_g_input,
|
||||
.vidioc_s_input = sur40_vidioc_s_input,
|
||||
|
||||
.vidioc_reqbufs = vb2_ioctl_reqbufs,
|
||||
.vidioc_create_bufs = vb2_ioctl_create_bufs,
|
||||
.vidioc_querybuf = vb2_ioctl_querybuf,
|
||||
.vidioc_qbuf = vb2_ioctl_qbuf,
|
||||
.vidioc_dqbuf = vb2_ioctl_dqbuf,
|
||||
.vidioc_expbuf = vb2_ioctl_expbuf,
|
||||
|
||||
.vidioc_streamon = vb2_ioctl_streamon,
|
||||
.vidioc_streamoff = vb2_ioctl_streamoff,
|
||||
};
|
||||
|
||||
static const struct video_device sur40_video_device = {
|
||||
.name = DRIVER_LONG,
|
||||
.fops = &sur40_video_fops,
|
||||
.ioctl_ops = &sur40_video_ioctl_ops,
|
||||
.release = video_device_release_empty,
|
||||
};
|
||||
|
||||
static const struct v4l2_pix_format sur40_video_format = {
|
||||
.pixelformat = V4L2_PIX_FMT_GREY,
|
||||
.width = SENSOR_RES_X / 2,
|
||||
.height = SENSOR_RES_Y / 2,
|
||||
.field = V4L2_FIELD_NONE,
|
||||
.colorspace = V4L2_COLORSPACE_SRGB,
|
||||
.bytesperline = SENSOR_RES_X / 2,
|
||||
.sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2),
|
||||
};
|
||||
|
||||
/* USB-specific object needed to register this driver with the USB subsystem. */
|
||||
static struct usb_driver sur40_driver = {
|
||||
.name = DRIVER_SHORT,
|
||||
|
Loading…
Reference in New Issue
Block a user