365 lines
10 KiB
C
365 lines
10 KiB
C
/*
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* gspca ViCam subdriver
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*
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* Copyright (C) 2011 Hans de Goede <hdegoede@redhat.com>
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*
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* Based on the usbvideo vicam driver, which is:
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*
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* Copyright (c) 2002 Joe Burks (jburks@wavicle.org),
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* Chris Cheney (chris.cheney@gmail.com),
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* Pavel Machek (pavel@ucw.cz),
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* John Tyner (jtyner@cs.ucr.edu),
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* Monroe Williams (monroe@pobox.com)
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#define MODULE_NAME "vicam"
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#define HEADER_SIZE 64
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#include <linux/workqueue.h>
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#include <linux/slab.h>
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#include <linux/firmware.h>
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#include <linux/ihex.h>
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#include "gspca.h"
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#define VICAM_FIRMWARE "vicam/firmware.fw"
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MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
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MODULE_DESCRIPTION("GSPCA ViCam USB Camera Driver");
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MODULE_LICENSE("GPL");
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MODULE_FIRMWARE(VICAM_FIRMWARE);
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struct sd {
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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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struct workqueue_struct *work_thread;
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};
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/* The vicam sensor has a resolution of 512 x 244, with I believe square
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pixels, but this is forced to a 4:3 ratio by optics. So it has
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non square pixels :( */
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static struct v4l2_pix_format vicam_mode[] = {
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{ 256, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
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.bytesperline = 256,
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.sizeimage = 256 * 122,
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.colorspace = V4L2_COLORSPACE_SRGB,},
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/* 2 modes with somewhat more square pixels */
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{ 256, 200, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
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.bytesperline = 256,
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.sizeimage = 256 * 200,
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.colorspace = V4L2_COLORSPACE_SRGB,},
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{ 256, 240, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
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.bytesperline = 256,
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.sizeimage = 256 * 240,
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.colorspace = V4L2_COLORSPACE_SRGB,},
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#if 0 /* This mode has extremely non square pixels, testing use only */
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{ 512, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
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.bytesperline = 512,
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.sizeimage = 512 * 122,
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.colorspace = V4L2_COLORSPACE_SRGB,},
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#endif
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{ 512, 244, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
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.bytesperline = 512,
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.sizeimage = 512 * 244,
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.colorspace = V4L2_COLORSPACE_SRGB,},
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};
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static int vicam_control_msg(struct gspca_dev *gspca_dev, u8 request,
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u16 value, u16 index, u8 *data, u16 len)
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{
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int ret;
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ret = usb_control_msg(gspca_dev->dev,
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usb_sndctrlpipe(gspca_dev->dev, 0),
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request,
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USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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value, index, data, len, 1000);
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if (ret < 0)
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pr_err("control msg req %02X error %d\n", request, ret);
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return ret;
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}
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static int vicam_set_camera_power(struct gspca_dev *gspca_dev, int state)
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{
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int ret;
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ret = vicam_control_msg(gspca_dev, 0x50, state, 0, NULL, 0);
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if (ret < 0)
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return ret;
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if (state)
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ret = vicam_control_msg(gspca_dev, 0x55, 1, 0, NULL, 0);
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return ret;
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}
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/*
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* request and read a block of data
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*/
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static int vicam_read_frame(struct gspca_dev *gspca_dev, u8 *data, int size)
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{
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int ret, unscaled_height, act_len = 0;
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u8 *req_data = gspca_dev->usb_buf;
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s32 expo = v4l2_ctrl_g_ctrl(gspca_dev->exposure);
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s32 gain = v4l2_ctrl_g_ctrl(gspca_dev->gain);
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memset(req_data, 0, 16);
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req_data[0] = gain;
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if (gspca_dev->pixfmt.width == 256)
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req_data[1] |= 0x01; /* low nibble x-scale */
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if (gspca_dev->pixfmt.height <= 122) {
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req_data[1] |= 0x10; /* high nibble y-scale */
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unscaled_height = gspca_dev->pixfmt.height * 2;
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} else
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unscaled_height = gspca_dev->pixfmt.height;
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req_data[2] = 0x90; /* unknown, does not seem to do anything */
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if (unscaled_height <= 200)
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req_data[3] = 0x06; /* vend? */
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else if (unscaled_height <= 242) /* Yes 242 not 240 */
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req_data[3] = 0x07; /* vend? */
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else /* Up to 244 lines with req_data[3] == 0x08 */
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req_data[3] = 0x08; /* vend? */
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if (expo < 256) {
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/* Frame rate maxed out, use partial frame expo time */
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req_data[4] = 255 - expo;
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req_data[5] = 0x00;
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req_data[6] = 0x00;
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req_data[7] = 0x01;
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} else {
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/* Modify frame rate */
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req_data[4] = 0x00;
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req_data[5] = 0x00;
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req_data[6] = expo & 0xFF;
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req_data[7] = expo >> 8;
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}
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req_data[8] = ((244 - unscaled_height) / 2) & ~0x01; /* vstart */
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/* bytes 9-15 do not seem to affect exposure or image quality */
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mutex_lock(&gspca_dev->usb_lock);
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ret = vicam_control_msg(gspca_dev, 0x51, 0x80, 0, req_data, 16);
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mutex_unlock(&gspca_dev->usb_lock);
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if (ret < 0)
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return ret;
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ret = usb_bulk_msg(gspca_dev->dev,
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usb_rcvbulkpipe(gspca_dev->dev, 0x81),
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data, size, &act_len, 10000);
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/* successful, it returns 0, otherwise negative */
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if (ret < 0 || act_len != size) {
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pr_err("bulk read fail (%d) len %d/%d\n",
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ret, act_len, size);
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return -EIO;
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}
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return 0;
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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 cameras controls are only written from the workqueue.
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*/
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static void vicam_dostream(struct work_struct *work)
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{
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struct sd *sd = container_of(work, struct sd, work_struct);
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struct gspca_dev *gspca_dev = &sd->gspca_dev;
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int ret, frame_sz;
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u8 *buffer;
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frame_sz = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].sizeimage +
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HEADER_SIZE;
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buffer = kmalloc(frame_sz, GFP_KERNEL | GFP_DMA);
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if (!buffer) {
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pr_err("Couldn't allocate USB buffer\n");
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goto exit;
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}
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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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ret = vicam_read_frame(gspca_dev, buffer, frame_sz);
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if (ret < 0)
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break;
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/* Note the frame header contents seem to be completely
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constant, they do not change with either image, or
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settings. So we simply discard it. The frames have
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a very similar 64 byte footer, which we don't even
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bother reading from the cam */
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gspca_frame_add(gspca_dev, FIRST_PACKET,
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buffer + HEADER_SIZE,
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frame_sz - HEADER_SIZE);
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gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
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}
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exit:
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kfree(buffer);
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}
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/* This function is called at probe time just before sd_init */
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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 cam *cam = &gspca_dev->cam;
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struct sd *sd = (struct sd *)gspca_dev;
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/* We don't use the buffer gspca allocates so make it small. */
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cam->bulk = 1;
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cam->bulk_size = 64;
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cam->cam_mode = vicam_mode;
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cam->nmodes = ARRAY_SIZE(vicam_mode);
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INIT_WORK(&sd->work_struct, vicam_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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int ret;
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const struct ihex_binrec *rec;
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const struct firmware *uninitialized_var(fw);
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u8 *firmware_buf;
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ret = request_ihex_firmware(&fw, VICAM_FIRMWARE,
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&gspca_dev->dev->dev);
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if (ret) {
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pr_err("Failed to load \"vicam/firmware.fw\": %d\n", ret);
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return ret;
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}
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firmware_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
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if (!firmware_buf) {
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ret = -ENOMEM;
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goto exit;
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}
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for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
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memcpy(firmware_buf, rec->data, be16_to_cpu(rec->len));
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ret = vicam_control_msg(gspca_dev, 0xff, 0, 0, firmware_buf,
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be16_to_cpu(rec->len));
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if (ret < 0)
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break;
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}
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kfree(firmware_buf);
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exit:
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release_firmware(fw);
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return ret;
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}
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/* Set up for getting frames. */
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static int sd_start(struct gspca_dev *gspca_dev)
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{
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struct sd *sd = (struct sd *)gspca_dev;
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int ret;
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ret = vicam_set_camera_power(gspca_dev, 1);
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if (ret < 0)
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return ret;
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/* Start the workqueue function to do the streaming */
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sd->work_thread = create_singlethread_workqueue(MODULE_NAME);
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queue_work(sd->work_thread, &sd->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 sd *dev = (struct sd *)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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/* This waits for vicam_dostream to finish */
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destroy_workqueue(dev->work_thread);
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dev->work_thread = NULL;
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mutex_lock(&gspca_dev->usb_lock);
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if (gspca_dev->present)
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vicam_set_camera_power(gspca_dev, 0);
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}
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static int sd_init_controls(struct gspca_dev *gspca_dev)
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{
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struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;
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gspca_dev->vdev.ctrl_handler = hdl;
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v4l2_ctrl_handler_init(hdl, 2);
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gspca_dev->exposure = v4l2_ctrl_new_std(hdl, NULL,
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V4L2_CID_EXPOSURE, 0, 2047, 1, 256);
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gspca_dev->gain = v4l2_ctrl_new_std(hdl, NULL,
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V4L2_CID_GAIN, 0, 255, 1, 200);
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if (hdl->error) {
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pr_err("Could not initialize controls\n");
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return hdl->error;
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}
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return 0;
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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(0x04c1, 0x009d)},
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{USB_DEVICE(0x0602, 0x1001)},
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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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.init_controls = sd_init_controls,
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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 sd),
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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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