/*
* gspca ViCam subdriver
*
* Copyright (C) 2011 Hans de Goede <hdegoede@redhat.com>
*
* Based on the usbvideo vicam driver, which is:
*
* Copyright (c) 2002 Joe Burks (jburks@wavicle.org),
* Christopher L Cheney (ccheney@cheney.cx),
* Pavel Machek (pavel@ucw.cz),
* John Tyner (jtyner@cs.ucr.edu),
* Monroe Williams (monroe@pobox.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#define MODULE_NAME "vicam"
#define HEADER_SIZE 64
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/firmware.h>
#include <linux/ihex.h>
#include "gspca.h"
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("GSPCA ViCam USB Camera Driver");
MODULE_LICENSE("GPL");
enum e_ctrl {
GAIN,
EXPOSURE,
NCTRL /* number of controls */
};
struct sd {
struct gspca_dev gspca_dev; /* !! must be the first item */
struct work_struct work_struct;
struct workqueue_struct *work_thread;
struct gspca_ctrl ctrls[NCTRL];
};
/* The vicam sensor has a resolution of 512 x 244, with I believe square
pixels, but this is forced to a 4:3 ratio by optics. So it has
non square pixels :( */
static struct v4l2_pix_format vicam_mode[] = {
{ 256, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
.bytesperline = 256,
.sizeimage = 256 * 122,
.colorspace = V4L2_COLORSPACE_SRGB,},
/* 2 modes with somewhat more square pixels */
{ 256, 200, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
.bytesperline = 256,
.sizeimage = 256 * 200,
.colorspace = V4L2_COLORSPACE_SRGB,},
{ 256, 240, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
.bytesperline = 256,
.sizeimage = 256 * 240,
.colorspace = V4L2_COLORSPACE_SRGB,},
#if 0 /* This mode has extremely non square pixels, testing use only */
{ 512, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
.bytesperline = 512,
.sizeimage = 512 * 122,
.colorspace = V4L2_COLORSPACE_SRGB,},
#endif
{ 512, 244, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
.bytesperline = 512,
.sizeimage = 512 * 244,
.colorspace = V4L2_COLORSPACE_SRGB,},
};
static const struct ctrl sd_ctrls[] = {
[GAIN] = {
{
.id = V4L2_CID_GAIN,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Gain",
.minimum = 0,
.maximum = 255,
.step = 1,
.default_value = 200,
},
},
[EXPOSURE] = {
{
.id = V4L2_CID_EXPOSURE,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Exposure",
.minimum = 0,
.maximum = 2047,
.step = 1,
.default_value = 256,
},
},
};
static int vicam_control_msg(struct gspca_dev *gspca_dev, u8 request,
u16 value, u16 index, u8 *data, u16 len)
{
int ret;
ret = usb_control_msg(gspca_dev->dev,
usb_sndctrlpipe(gspca_dev->dev, 0),
request,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
value, index, data, len, 1000);
if (ret < 0)
pr_err("control msg req %02X error %d\n", request, ret);
return ret;
}
static int vicam_set_camera_power(struct gspca_dev *gspca_dev, int state)
{
int ret;
ret = vicam_control_msg(gspca_dev, 0x50, state, 0, NULL, 0);
if (ret < 0)
return ret;
if (state)
ret = vicam_control_msg(gspca_dev, 0x55, 1, 0, NULL, 0);
return ret;
}
/*
* request and read a block of data - see warning on vicam_command.
*/
static int vicam_read_frame(struct gspca_dev *gspca_dev, u8 *data, int size)
{
struct sd *sd = (struct sd *)gspca_dev;
int ret, unscaled_height, act_len = 0;
u8 *req_data = gspca_dev->usb_buf;
memset(req_data, 0, 16);
req_data[0] = sd->ctrls[GAIN].val;
if (gspca_dev->width == 256)
req_data[1] |= 0x01; /* low nibble x-scale */
if (gspca_dev->height <= 122) {
req_data[1] |= 0x10; /* high nibble y-scale */
unscaled_height = gspca_dev->height * 2;
} else
unscaled_height = gspca_dev->height;
req_data[2] = 0x90; /* unknown, does not seem to do anything */
if (unscaled_height <= 200)
req_data[3] = 0x06; /* vend? */
else if (unscaled_height <= 242) /* Yes 242 not 240 */
req_data[3] = 0x07; /* vend? */
else /* Up to 244 lines with req_data[3] == 0x08 */
req_data[3] = 0x08; /* vend? */
if (sd->ctrls[EXPOSURE].val < 256) {
/* Frame rate maxed out, use partial frame expo time */
req_data[4] = 255 - sd->ctrls[EXPOSURE].val;
req_data[5] = 0x00;
req_data[6] = 0x00;
req_data[7] = 0x01;
} else {
/* Modify frame rate */
req_data[4] = 0x00;
req_data[5] = 0x00;
req_data[6] = sd->ctrls[EXPOSURE].val & 0xFF;
req_data[7] = sd->ctrls[EXPOSURE].val >> 8;
}
req_data[8] = ((244 - unscaled_height) / 2) & ~0x01; /* vstart */
/* bytes 9-15 do not seem to affect exposure or image quality */
mutex_lock(&gspca_dev->usb_lock);
ret = vicam_control_msg(gspca_dev, 0x51, 0x80, 0, req_data, 16);
mutex_unlock(&gspca_dev->usb_lock);
if (ret < 0)
return ret;
ret = usb_bulk_msg(gspca_dev->dev,
usb_rcvbulkpipe(gspca_dev->dev, 0x81),
data, size, &act_len, 10000);
/* successful, it returns 0, otherwise negative */
if (ret < 0 || act_len != size) {
pr_err("bulk read fail (%d) len %d/%d\n",
ret, act_len, size);
return -EIO;
}
return 0;
}
/* This function is called as a workqueue function and runs whenever the camera
* is streaming data. Because it is a workqueue function it is allowed to sleep
* so we can use synchronous USB calls. To avoid possible collisions with other
* threads attempting to use the camera's USB interface we take the gspca
* usb_lock when performing USB operations. In practice the only thing we need
* to protect against is the usb_set_interface call that gspca makes during
* stream_off as the camera doesn't provide any controls that the user could try
* to change.
*/
static void vicam_dostream(struct work_struct *work)
{
struct sd *sd = container_of(work, struct sd, work_struct);
struct gspca_dev *gspca_dev = &sd->gspca_dev;
int ret, frame_sz;
u8 *buffer;
frame_sz = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].sizeimage +
HEADER_SIZE;
buffer = kmalloc(frame_sz, GFP_KERNEL | GFP_DMA);
if (!buffer) {
pr_err("Couldn't allocate USB buffer\n");
goto exit;
}
while (gspca_dev->present && gspca_dev->streaming) {
ret = vicam_read_frame(gspca_dev, buffer, frame_sz);
if (ret < 0)
break;
/* Note the frame header contents seem to be completely
constant, they do not change with either image, or
settings. So we simply discard it. The frames have
a very similar 64 byte footer, which we don't even
bother reading from the cam */
gspca_frame_add(gspca_dev, FIRST_PACKET,
buffer + HEADER_SIZE,
frame_sz - HEADER_SIZE);
gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
}
exit:
kfree(buffer);
}
/* This function is called at probe time just before sd_init */
static int sd_config(struct gspca_dev *gspca_dev,
const struct usb_device_id *id)
{
struct cam *cam = &gspca_dev->cam;
struct sd *sd = (struct sd *)gspca_dev;
/* We don't use the buffer gspca allocates so make it small. */
cam->bulk = 1;
cam->bulk_size = 64;
cam->cam_mode = vicam_mode;
cam->nmodes = ARRAY_SIZE(vicam_mode);
cam->ctrls = sd->ctrls;
INIT_WORK(&sd->work_struct, vicam_dostream);
return 0;
}
/* this function is called at probe and resume time */
static int sd_init(struct gspca_dev *gspca_dev)
{
int ret;
const struct ihex_binrec *rec;
const struct firmware *uninitialized_var(fw);
u8 *firmware_buf;
ret = request_ihex_firmware(&fw, "vicam/firmware.fw",
&gspca_dev->dev->dev);
if (ret) {
pr_err("Failed to load \"vicam/firmware.fw\": %d\n", ret);
return ret;
}
firmware_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (!firmware_buf) {
ret = -ENOMEM;
goto exit;
}
for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
memcpy(firmware_buf, rec->data, be16_to_cpu(rec->len));
ret = vicam_control_msg(gspca_dev, 0xff, 0, 0, firmware_buf,
be16_to_cpu(rec->len));
if (ret < 0)
break;
}
kfree(firmware_buf);
exit:
release_firmware(fw);
return ret;
}
/* Set up for getting frames. */
static int sd_start(struct gspca_dev *gspca_dev)
{
struct sd *sd = (struct sd *)gspca_dev;
int ret;
ret = vicam_set_camera_power(gspca_dev, 1);
if (ret < 0)
return ret;
/* Start the workqueue function to do the streaming */
sd->work_thread = create_singlethread_workqueue(MODULE_NAME);
queue_work(sd->work_thread, &sd->work_struct);
return 0;
}
/* called on streamoff with alt==0 and on disconnect */
/* the usb_lock is held at entry - restore on exit */
static void sd_stop0(struct gspca_dev *gspca_dev)
{
struct sd *dev = (struct sd *)gspca_dev;
/* wait for the work queue to terminate */
mutex_unlock(&gspca_dev->usb_lock);
/* This waits for vicam_dostream to finish */
destroy_workqueue(dev->work_thread);
dev->work_thread = NULL;
mutex_lock(&gspca_dev->usb_lock);
vicam_set_camera_power(gspca_dev, 0);
}
/* Table of supported USB devices */
static const struct usb_device_id device_table[] = {
{USB_DEVICE(0x04c1, 0x009d)},
{USB_DEVICE(0x0602, 0x1001)},
{}
};
MODULE_DEVICE_TABLE(usb, device_table);
/* sub-driver description */
static const struct sd_desc sd_desc = {
.name = MODULE_NAME,
.ctrls = sd_ctrls,
.nctrls = ARRAY_SIZE(sd_ctrls),
.config = sd_config,
.init = sd_init,
.start = sd_start,
.stop0 = sd_stop0,
};
/* -- device connect -- */
static int sd_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
return gspca_dev_probe(intf, id,
&sd_desc,
sizeof(struct sd),
THIS_MODULE);
}
static struct usb_driver sd_driver = {
.name = MODULE_NAME,
.id_table = device_table,
.probe = sd_probe,
.disconnect = gspca_disconnect,
#ifdef CONFIG_PM
.suspend = gspca_suspend,
.resume = gspca_resume,
#endif
};
/* -- module insert / remove -- */
static int __init sd_mod_init(void)
{
return usb_register(&sd_driver);
}
static void __exit sd_mod_exit(void)
{
usb_deregister(&sd_driver);
}
module_init(sd_mod_init);
module_exit(sd_mod_exit);
