drivers/media/usb/gspca/finepix.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Fujifilm Finepix subdriver
  *
  * Copyright (C) 2008 Frank Zago
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #define MODULE_NAME "finepix"

 #include "gspca.h"

 MODULE_AUTHOR("Frank Zago <frank@zago.net>");
 MODULE_DESCRIPTION("Fujifilm FinePix USB V4L2 driver");
 MODULE_LICENSE("GPL");

 /* Default timeout, in ms */
 #define FPIX_TIMEOUT 250

 /* Maximum transfer size to use. The windows driver reads by chunks of
  * 0x2000 bytes, so do the same. Note: reading more seems to work
  * too. */
 #define FPIX_MAX_TRANSFER 0x2000

 /* Structure to hold all of our device specific stuff */
 struct usb_fpix {
 	struct gspca_dev gspca_dev;	/* !! must be the first item */

 	struct work_struct work_struct;
 };

 /* Delay after which claim the next frame. If the delay is too small,
  * the camera will return old frames. On the 4800Z, 20ms is bad, 25ms
  * will fail every 4 or 5 frames, but 30ms is perfect. On the A210,
  * 30ms is bad while 35ms is perfect. */
 #define NEXT_FRAME_DELAY 35

 /* These cameras only support 320x200. */
 static const struct v4l2_pix_format fpix_mode[1] = {
 	{ 320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
 		.bytesperline = 320,
 		.sizeimage = 320 * 240 * 3 / 8 + 590,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 0}
 };

 /* send a command to the webcam */
 static int command(struct gspca_dev *gspca_dev,
 		int order)	/* 0: reset, 1: frame request */
 {
 	static u8 order_values[2][12] = {
 		{0xc6, 0, 0, 0, 0, 0, 0,    0, 0x20, 0, 0, 0},	/* reset */
 		{0xd3, 0, 0, 0, 0, 0, 0, 0x01,    0, 0, 0, 0},	/* fr req */
 	};

 	memcpy(gspca_dev->usb_buf, order_values[order], 12);
 	return usb_control_msg(gspca_dev->dev,
 			usb_sndctrlpipe(gspca_dev->dev, 0),
 			USB_REQ_GET_STATUS,
 			USB_DIR_OUT | USB_TYPE_CLASS |
 			USB_RECIP_INTERFACE, 0, 0, gspca_dev->usb_buf,
 			12, FPIX_TIMEOUT);
 }

 /*
  * 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 gspca_dev->usb_buf we take the usb_lock when
  * performing USB operations using it. In practice we don't really need this
  * as the camera doesn't provide any controls.
  */
 static void dostream(struct work_struct *work)
 {
 	struct usb_fpix *dev = container_of(work, struct usb_fpix, work_struct);
 	struct gspca_dev *gspca_dev = &dev->gspca_dev;
 	struct urb *urb = gspca_dev->urb[0];
 	u8 *data = urb->transfer_buffer;
 	int ret = 0;
 	int len;

 	gspca_dbg(gspca_dev, D_STREAM, "dostream started\n");

 	/* loop reading a frame */
 again:
 	while (gspca_dev->present && gspca_dev->streaming) {
 #ifdef CONFIG_PM
 		if (gspca_dev->frozen)
 			break;
 #endif

 		/* request a frame */
 		mutex_lock(&gspca_dev->usb_lock);
 		ret = command(gspca_dev, 1);
 		mutex_unlock(&gspca_dev->usb_lock);
 		if (ret < 0)
 			break;
 #ifdef CONFIG_PM
 		if (gspca_dev->frozen)
 			break;
 #endif
 		if (!gspca_dev->present || !gspca_dev->streaming)
 			break;

 		/* the frame comes in parts */
 		for (;;) {
 			ret = usb_bulk_msg(gspca_dev->dev,
 					urb->pipe,
 					data,
 					FPIX_MAX_TRANSFER,
 					&len, FPIX_TIMEOUT);
 			if (ret < 0) {
 				/* Most of the time we get a timeout
 				 * error. Just restart. */
 				goto again;
 			}
 #ifdef CONFIG_PM
 			if (gspca_dev->frozen)
 				goto out;
 #endif
 			if (!gspca_dev->present || !gspca_dev->streaming)
 				goto out;
 			if (len < FPIX_MAX_TRANSFER ||
 				(data[len - 2] == 0xff &&
 					data[len - 1] == 0xd9)) {

 				/* If the result is less than what was asked
 				 * for, then it's the end of the
 				 * frame. Sometimes the jpeg is not complete,
 				 * but there's nothing we can do. We also end
 				 * here if the jpeg ends right at the end
 				 * of the frame. */
 				gspca_frame_add(gspca_dev, LAST_PACKET,
 						data, len);
 				break;
 			}

 			/* got a partial image */
 			gspca_frame_add(gspca_dev,
 					gspca_dev->last_packet_type
 						== LAST_PACKET
 					? FIRST_PACKET : INTER_PACKET,
 					data, len);
 		}

 		/* We must wait before trying reading the next
 		 * frame. If we don't, or if the delay is too short,
 		 * the camera will disconnect. */
 		msleep(NEXT_FRAME_DELAY);
 	}

 out:
 	gspca_dbg(gspca_dev, D_STREAM, "dostream stopped\n");
 }

 /* this function is called at probe time */
 static int sd_config(struct gspca_dev *gspca_dev,
 		const struct usb_device_id *id)
 {
 	struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
 	struct cam *cam = &gspca_dev->cam;

 	cam->cam_mode = fpix_mode;
 	cam->nmodes = 1;
 	cam->bulk = 1;
 	cam->bulk_size = FPIX_MAX_TRANSFER;

 	INIT_WORK(&dev->work_struct, dostream);

 	return 0;
 }

 /* this function is called at probe and resume time */
 static int sd_init(struct gspca_dev *gspca_dev)
 {
 	return 0;
 }

 /* start the camera */
 static int sd_start(struct gspca_dev *gspca_dev)
 {
 	struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
 	int ret, len;

 	/* Init the device */
 	ret = command(gspca_dev, 0);
 	if (ret < 0) {
 		pr_err("init failed %d\n", ret);
 		return ret;
 	}

 	/* Read the result of the command. Ignore the result, for it
 	 * varies with the device. */
 	ret = usb_bulk_msg(gspca_dev->dev,
 			gspca_dev->urb[0]->pipe,
 			gspca_dev->urb[0]->transfer_buffer,
 			FPIX_MAX_TRANSFER, &len,
 			FPIX_TIMEOUT);
 	if (ret < 0) {
 		pr_err("usb_bulk_msg failed %d\n", ret);
 		return ret;
 	}

 	/* Request a frame, but don't read it */
 	ret = command(gspca_dev, 1);
 	if (ret < 0) {
 		pr_err("frame request failed %d\n", ret);
 		return ret;
 	}

 	/* Again, reset bulk in endpoint */
 	usb_clear_halt(gspca_dev->dev, gspca_dev->urb[0]->pipe);

 	schedule_work(&dev->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 usb_fpix *dev = (struct usb_fpix *) gspca_dev;

 	/* wait for the work queue to terminate */
 	mutex_unlock(&gspca_dev->usb_lock);
 	flush_work(&dev->work_struct);
 	mutex_lock(&gspca_dev->usb_lock);
 }

 /* Table of supported USB devices */
 static const struct usb_device_id device_table[] = {
 	{USB_DEVICE(0x04cb, 0x0104)},
 	{USB_DEVICE(0x04cb, 0x0109)},
 	{USB_DEVICE(0x04cb, 0x010b)},
 	{USB_DEVICE(0x04cb, 0x010f)},
 	{USB_DEVICE(0x04cb, 0x0111)},
 	{USB_DEVICE(0x04cb, 0x0113)},
 	{USB_DEVICE(0x04cb, 0x0115)},
 	{USB_DEVICE(0x04cb, 0x0117)},
 	{USB_DEVICE(0x04cb, 0x0119)},
 	{USB_DEVICE(0x04cb, 0x011b)},
 	{USB_DEVICE(0x04cb, 0x011d)},
 	{USB_DEVICE(0x04cb, 0x0121)},
 	{USB_DEVICE(0x04cb, 0x0123)},
 	{USB_DEVICE(0x04cb, 0x0125)},
 	{USB_DEVICE(0x04cb, 0x0127)},
 	{USB_DEVICE(0x04cb, 0x0129)},
 	{USB_DEVICE(0x04cb, 0x012b)},
 	{USB_DEVICE(0x04cb, 0x012d)},
 	{USB_DEVICE(0x04cb, 0x012f)},
 	{USB_DEVICE(0x04cb, 0x0131)},
 	{USB_DEVICE(0x04cb, 0x013b)},
 	{USB_DEVICE(0x04cb, 0x013d)},
 	{USB_DEVICE(0x04cb, 0x013f)},
 	{}
 };

 MODULE_DEVICE_TABLE(usb, device_table);

 /* sub-driver description */
 static const struct sd_desc sd_desc = {
 	.name   = MODULE_NAME,
 	.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 usb_fpix),
 			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,
 	.reset_resume = gspca_resume,
 #endif
 };

 module_usb_driver(sd_driver);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Fujifilm Finepix subdriver
	*
	* Copyright (C) 2008 Frank Zago
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#define MODULE_NAME "finepix"

	#include "gspca.h"

	MODULE_AUTHOR("Frank Zago <frank@zago.net>");
	MODULE_DESCRIPTION("Fujifilm FinePix USB V4L2 driver");
	MODULE_LICENSE("GPL");

	/* Default timeout, in ms */
	#define FPIX_TIMEOUT 250

	/* Maximum transfer size to use. The windows driver reads by chunks of
	* 0x2000 bytes, so do the same. Note: reading more seems to work
	* too. */
	#define FPIX_MAX_TRANSFER 0x2000

	/* Structure to hold all of our device specific stuff */
	struct usb_fpix {
	struct gspca_dev gspca_dev; /* !! must be the first item */

	struct work_struct work_struct;
	};

	/* Delay after which claim the next frame. If the delay is too small,
	* the camera will return old frames. On the 4800Z, 20ms is bad, 25ms
	* will fail every 4 or 5 frames, but 30ms is perfect. On the A210,
	* 30ms is bad while 35ms is perfect. */
	#define NEXT_FRAME_DELAY 35

	/* These cameras only support 320x200. */
	static const struct v4l2_pix_format fpix_mode[1] = {
	{ 320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
	.bytesperline = 320,
	.sizeimage = 320 * 240 * 3 / 8 + 590,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 0}
	};

	/* send a command to the webcam */
	static int command(struct gspca_dev *gspca_dev,
	int order) /* 0: reset, 1: frame request */
	{
	static u8 order_values[2][12] = {
	{0xc6, 0, 0, 0, 0, 0, 0, 0, 0x20, 0, 0, 0}, /* reset */
	{0xd3, 0, 0, 0, 0, 0, 0, 0x01, 0, 0, 0, 0}, /* fr req */
	};

	memcpy(gspca_dev->usb_buf, order_values[order], 12);
	return usb_control_msg(gspca_dev->dev,
	usb_sndctrlpipe(gspca_dev->dev, 0),
	USB_REQ_GET_STATUS,
	USB_DIR_OUT \| USB_TYPE_CLASS \|
	USB_RECIP_INTERFACE, 0, 0, gspca_dev->usb_buf,
	12, FPIX_TIMEOUT);
	}

	/*
	* 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 gspca_dev->usb_buf we take the usb_lock when
	* performing USB operations using it. In practice we don't really need this
	* as the camera doesn't provide any controls.
	*/
	static void dostream(struct work_struct *work)
	{
	struct usb_fpix *dev = container_of(work, struct usb_fpix, work_struct);
	struct gspca_dev *gspca_dev = &dev->gspca_dev;
	struct urb *urb = gspca_dev->urb[0];
	u8 *data = urb->transfer_buffer;
	int ret = 0;
	int len;

	gspca_dbg(gspca_dev, D_STREAM, "dostream started\n");

	/* loop reading a frame */
	again:
	while (gspca_dev->present && gspca_dev->streaming) {
	#ifdef CONFIG_PM
	if (gspca_dev->frozen)
	break;
	#endif

	/* request a frame */
	mutex_lock(&gspca_dev->usb_lock);
	ret = command(gspca_dev, 1);
	mutex_unlock(&gspca_dev->usb_lock);
	if (ret < 0)
	break;
	#ifdef CONFIG_PM
	if (gspca_dev->frozen)
	break;
	#endif
	if (!gspca_dev->present \|\| !gspca_dev->streaming)
	break;

	/* the frame comes in parts */
	for (;;) {
	ret = usb_bulk_msg(gspca_dev->dev,
	urb->pipe,
	data,
	FPIX_MAX_TRANSFER,
	&len, FPIX_TIMEOUT);
	if (ret < 0) {
	/* Most of the time we get a timeout
	* error. Just restart. */
	goto again;
	}
	#ifdef CONFIG_PM
	if (gspca_dev->frozen)
	goto out;
	#endif
	if (!gspca_dev->present \|\| !gspca_dev->streaming)
	goto out;
	if (len < FPIX_MAX_TRANSFER \|\|
	(data[len - 2] == 0xff &&
	data[len - 1] == 0xd9)) {

	/* If the result is less than what was asked
	* for, then it's the end of the
	* frame. Sometimes the jpeg is not complete,
	* but there's nothing we can do. We also end
	* here if the jpeg ends right at the end
	* of the frame. */
	gspca_frame_add(gspca_dev, LAST_PACKET,
	data, len);
	break;
	}

	/* got a partial image */
	gspca_frame_add(gspca_dev,
	gspca_dev->last_packet_type
	== LAST_PACKET
	? FIRST_PACKET : INTER_PACKET,
	data, len);
	}

	/* We must wait before trying reading the next
	* frame. If we don't, or if the delay is too short,
	* the camera will disconnect. */
	msleep(NEXT_FRAME_DELAY);
	}

	out:
	gspca_dbg(gspca_dev, D_STREAM, "dostream stopped\n");
	}

	/* this function is called at probe time */
	static int sd_config(struct gspca_dev *gspca_dev,
	const struct usb_device_id *id)
	{
	struct usb_fpix dev = (struct usb_fpix ) gspca_dev;
	struct cam *cam = &gspca_dev->cam;

	cam->cam_mode = fpix_mode;
	cam->nmodes = 1;
	cam->bulk = 1;
	cam->bulk_size = FPIX_MAX_TRANSFER;

	INIT_WORK(&dev->work_struct, dostream);

	return 0;
	}

	/* this function is called at probe and resume time */
	static int sd_init(struct gspca_dev *gspca_dev)
	{
	return 0;
	}

	/* start the camera */
	static int sd_start(struct gspca_dev *gspca_dev)
	{
	struct usb_fpix dev = (struct usb_fpix ) gspca_dev;
	int ret, len;

	/* Init the device */
	ret = command(gspca_dev, 0);
	if (ret < 0) {
	pr_err("init failed %d\n", ret);
	return ret;
	}

	/* Read the result of the command. Ignore the result, for it
	* varies with the device. */
	ret = usb_bulk_msg(gspca_dev->dev,
	gspca_dev->urb[0]->pipe,
	gspca_dev->urb[0]->transfer_buffer,
	FPIX_MAX_TRANSFER, &len,
	FPIX_TIMEOUT);
	if (ret < 0) {
	pr_err("usb_bulk_msg failed %d\n", ret);
	return ret;
	}

	/* Request a frame, but don't read it */
	ret = command(gspca_dev, 1);
	if (ret < 0) {
	pr_err("frame request failed %d\n", ret);
	return ret;
	}

	/* Again, reset bulk in endpoint */
	usb_clear_halt(gspca_dev->dev, gspca_dev->urb[0]->pipe);

	schedule_work(&dev->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 usb_fpix dev = (struct usb_fpix ) gspca_dev;

	/* wait for the work queue to terminate */
	mutex_unlock(&gspca_dev->usb_lock);
	flush_work(&dev->work_struct);
	mutex_lock(&gspca_dev->usb_lock);
	}

	/* Table of supported USB devices */
	static const struct usb_device_id device_table[] = {
	{USB_DEVICE(0x04cb, 0x0104)},
	{USB_DEVICE(0x04cb, 0x0109)},
	{USB_DEVICE(0x04cb, 0x010b)},
	{USB_DEVICE(0x04cb, 0x010f)},
	{USB_DEVICE(0x04cb, 0x0111)},
	{USB_DEVICE(0x04cb, 0x0113)},
	{USB_DEVICE(0x04cb, 0x0115)},
	{USB_DEVICE(0x04cb, 0x0117)},
	{USB_DEVICE(0x04cb, 0x0119)},
	{USB_DEVICE(0x04cb, 0x011b)},
	{USB_DEVICE(0x04cb, 0x011d)},
	{USB_DEVICE(0x04cb, 0x0121)},
	{USB_DEVICE(0x04cb, 0x0123)},
	{USB_DEVICE(0x04cb, 0x0125)},
	{USB_DEVICE(0x04cb, 0x0127)},
	{USB_DEVICE(0x04cb, 0x0129)},
	{USB_DEVICE(0x04cb, 0x012b)},
	{USB_DEVICE(0x04cb, 0x012d)},
	{USB_DEVICE(0x04cb, 0x012f)},
	{USB_DEVICE(0x04cb, 0x0131)},
	{USB_DEVICE(0x04cb, 0x013b)},
	{USB_DEVICE(0x04cb, 0x013d)},
	{USB_DEVICE(0x04cb, 0x013f)},
	{}
	};

	MODULE_DEVICE_TABLE(usb, device_table);

	/* sub-driver description */
	static const struct sd_desc sd_desc = {
	.name = MODULE_NAME,
	.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 usb_fpix),
	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,
	.reset_resume = gspca_resume,
	#endif
	};

	module_usb_driver(sd_driver);