mirror of https://gitee.com/openkylin/linux.git
303 lines
7.8 KiB
C
303 lines
7.8 KiB
C
/*
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* Fujifilm Finepix subdriver
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*
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* Copyright (C) 2008 Frank Zago
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#define MODULE_NAME "finepix"
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#include "gspca.h"
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MODULE_AUTHOR("Frank Zago <frank@zago.net>");
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MODULE_DESCRIPTION("Fujifilm FinePix USB V4L2 driver");
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MODULE_LICENSE("GPL");
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/* Default timeout, in ms */
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#define FPIX_TIMEOUT 250
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/* Maximum transfer size to use. The windows driver reads by chunks of
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* 0x2000 bytes, so do the same. Note: reading more seems to work
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* too. */
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#define FPIX_MAX_TRANSFER 0x2000
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/* Structure to hold all of our device specific stuff */
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struct usb_fpix {
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struct gspca_dev gspca_dev; /* !! must be the first item */
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struct work_struct work_struct;
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};
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/* Delay after which claim the next frame. If the delay is too small,
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* the camera will return old frames. On the 4800Z, 20ms is bad, 25ms
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* will fail every 4 or 5 frames, but 30ms is perfect. On the A210,
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* 30ms is bad while 35ms is perfect. */
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#define NEXT_FRAME_DELAY 35
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/* These cameras only support 320x200. */
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static const struct v4l2_pix_format fpix_mode[1] = {
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{ 320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
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.bytesperline = 320,
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.sizeimage = 320 * 240 * 3 / 8 + 590,
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.colorspace = V4L2_COLORSPACE_SRGB,
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.priv = 0}
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};
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/* send a command to the webcam */
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static int command(struct gspca_dev *gspca_dev,
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int order) /* 0: reset, 1: frame request */
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{
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static u8 order_values[2][12] = {
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{0xc6, 0, 0, 0, 0, 0, 0, 0, 0x20, 0, 0, 0}, /* reset */
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{0xd3, 0, 0, 0, 0, 0, 0, 0x01, 0, 0, 0, 0}, /* fr req */
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};
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memcpy(gspca_dev->usb_buf, order_values[order], 12);
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return usb_control_msg(gspca_dev->dev,
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usb_sndctrlpipe(gspca_dev->dev, 0),
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USB_REQ_GET_STATUS,
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USB_DIR_OUT | USB_TYPE_CLASS |
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USB_RECIP_INTERFACE, 0, 0, gspca_dev->usb_buf,
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12, FPIX_TIMEOUT);
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}
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/*
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* This function is called as a workqueue function and runs whenever the camera
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* is streaming data. Because it is a workqueue function it is allowed to sleep
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* so we can use synchronous USB calls. To avoid possible collisions with other
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* threads attempting to use gspca_dev->usb_buf we take the usb_lock when
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* performing USB operations using it. In practice we don't really need this
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* as the camera doesn't provide any controls.
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*/
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static void dostream(struct work_struct *work)
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{
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struct usb_fpix *dev = container_of(work, struct usb_fpix, work_struct);
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struct gspca_dev *gspca_dev = &dev->gspca_dev;
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struct urb *urb = gspca_dev->urb[0];
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u8 *data = urb->transfer_buffer;
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int ret = 0;
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int len;
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PDEBUG(D_STREAM, "dostream started");
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/* loop reading a frame */
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again:
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while (gspca_dev->present && gspca_dev->streaming) {
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#ifdef CONFIG_PM
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if (gspca_dev->frozen)
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break;
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#endif
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/* request a frame */
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mutex_lock(&gspca_dev->usb_lock);
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ret = command(gspca_dev, 1);
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mutex_unlock(&gspca_dev->usb_lock);
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if (ret < 0)
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break;
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#ifdef CONFIG_PM
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if (gspca_dev->frozen)
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break;
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#endif
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if (!gspca_dev->present || !gspca_dev->streaming)
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break;
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/* the frame comes in parts */
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for (;;) {
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ret = usb_bulk_msg(gspca_dev->dev,
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urb->pipe,
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data,
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FPIX_MAX_TRANSFER,
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&len, FPIX_TIMEOUT);
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if (ret < 0) {
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/* Most of the time we get a timeout
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* error. Just restart. */
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goto again;
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}
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#ifdef CONFIG_PM
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if (gspca_dev->frozen)
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goto out;
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#endif
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if (!gspca_dev->present || !gspca_dev->streaming)
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goto out;
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if (len < FPIX_MAX_TRANSFER ||
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(data[len - 2] == 0xff &&
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data[len - 1] == 0xd9)) {
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/* If the result is less than what was asked
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* for, then it's the end of the
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* frame. Sometimes the jpeg is not complete,
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* but there's nothing we can do. We also end
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* here if the the jpeg ends right at the end
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* of the frame. */
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gspca_frame_add(gspca_dev, LAST_PACKET,
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data, len);
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break;
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}
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/* got a partial image */
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gspca_frame_add(gspca_dev,
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gspca_dev->last_packet_type
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== LAST_PACKET
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? FIRST_PACKET : INTER_PACKET,
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data, len);
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}
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/* We must wait before trying reading the next
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* frame. If we don't, or if the delay is too short,
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* the camera will disconnect. */
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msleep(NEXT_FRAME_DELAY);
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}
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out:
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PDEBUG(D_STREAM, "dostream stopped");
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}
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/* this function is called at probe time */
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static int sd_config(struct gspca_dev *gspca_dev,
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const struct usb_device_id *id)
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{
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struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
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struct cam *cam = &gspca_dev->cam;
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cam->cam_mode = fpix_mode;
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cam->nmodes = 1;
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cam->bulk = 1;
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cam->bulk_size = FPIX_MAX_TRANSFER;
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INIT_WORK(&dev->work_struct, dostream);
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return 0;
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}
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/* this function is called at probe and resume time */
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static int sd_init(struct gspca_dev *gspca_dev)
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{
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return 0;
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}
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/* start the camera */
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static int sd_start(struct gspca_dev *gspca_dev)
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{
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struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
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int ret, len;
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/* Init the device */
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ret = command(gspca_dev, 0);
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if (ret < 0) {
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pr_err("init failed %d\n", ret);
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return ret;
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}
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/* Read the result of the command. Ignore the result, for it
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* varies with the device. */
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ret = usb_bulk_msg(gspca_dev->dev,
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gspca_dev->urb[0]->pipe,
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gspca_dev->urb[0]->transfer_buffer,
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FPIX_MAX_TRANSFER, &len,
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FPIX_TIMEOUT);
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if (ret < 0) {
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pr_err("usb_bulk_msg failed %d\n", ret);
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return ret;
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}
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/* Request a frame, but don't read it */
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ret = command(gspca_dev, 1);
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if (ret < 0) {
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pr_err("frame request failed %d\n", ret);
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return ret;
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}
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/* Again, reset bulk in endpoint */
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usb_clear_halt(gspca_dev->dev, gspca_dev->urb[0]->pipe);
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schedule_work(&dev->work_struct);
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return 0;
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}
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/* called on streamoff with alt==0 and on disconnect */
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/* the usb_lock is held at entry - restore on exit */
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static void sd_stop0(struct gspca_dev *gspca_dev)
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{
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struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
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/* wait for the work queue to terminate */
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mutex_unlock(&gspca_dev->usb_lock);
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flush_work(&dev->work_struct);
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mutex_lock(&gspca_dev->usb_lock);
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}
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/* Table of supported USB devices */
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static const struct usb_device_id device_table[] = {
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{USB_DEVICE(0x04cb, 0x0104)},
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{USB_DEVICE(0x04cb, 0x0109)},
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{USB_DEVICE(0x04cb, 0x010b)},
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{USB_DEVICE(0x04cb, 0x010f)},
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{USB_DEVICE(0x04cb, 0x0111)},
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{USB_DEVICE(0x04cb, 0x0113)},
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{USB_DEVICE(0x04cb, 0x0115)},
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{USB_DEVICE(0x04cb, 0x0117)},
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{USB_DEVICE(0x04cb, 0x0119)},
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{USB_DEVICE(0x04cb, 0x011b)},
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{USB_DEVICE(0x04cb, 0x011d)},
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{USB_DEVICE(0x04cb, 0x0121)},
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{USB_DEVICE(0x04cb, 0x0123)},
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{USB_DEVICE(0x04cb, 0x0125)},
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{USB_DEVICE(0x04cb, 0x0127)},
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{USB_DEVICE(0x04cb, 0x0129)},
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{USB_DEVICE(0x04cb, 0x012b)},
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{USB_DEVICE(0x04cb, 0x012d)},
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{USB_DEVICE(0x04cb, 0x012f)},
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{USB_DEVICE(0x04cb, 0x0131)},
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{USB_DEVICE(0x04cb, 0x013b)},
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{USB_DEVICE(0x04cb, 0x013d)},
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{USB_DEVICE(0x04cb, 0x013f)},
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{}
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};
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MODULE_DEVICE_TABLE(usb, device_table);
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/* sub-driver description */
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static const struct sd_desc sd_desc = {
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.name = MODULE_NAME,
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.config = sd_config,
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.init = sd_init,
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.start = sd_start,
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.stop0 = sd_stop0,
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};
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/* -- device connect -- */
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static int sd_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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return gspca_dev_probe(intf, id,
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&sd_desc,
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sizeof(struct usb_fpix),
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THIS_MODULE);
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}
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static struct usb_driver sd_driver = {
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.name = MODULE_NAME,
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.id_table = device_table,
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.probe = sd_probe,
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.disconnect = gspca_disconnect,
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#ifdef CONFIG_PM
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.suspend = gspca_suspend,
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.resume = gspca_resume,
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.reset_resume = gspca_resume,
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#endif
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};
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module_usb_driver(sd_driver);
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