patch-2.3.99-pre4 linux/drivers/char/cpia_usb.c

• Lines: 627
• Date: Thu Mar 30 18:00:01 2000
• Orig file: v2.3.99-pre3/linux/drivers/char/cpia_usb.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre3/linux/drivers/char/cpia_usb.c linux/drivers/char/cpia_usb.c
@@ -0,0 +1,626 @@
+/*
+ * cpia_usb CPiA USB driver
+ *
+ * Supports CPiA based parallel port Video Camera's.
+ *
+ * Copyright (C) 1999        Jochen Scharrlach <Jochen.Scharrlach@schwaben.de>
+ * Copyright (C) 1999, 2000  Johannes Erdfelt <jerdfelt@valinux.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
+ * (at your option) 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/usb.h>
+
+#include "cpia.h"
+
+#define USB_REQ_CPIA_GRAB_FRAME			0xC1
+#define USB_REQ_CPIA_UPLOAD_FRAME		0xC2
+#define  WAIT_FOR_NEXT_FRAME			0
+#define  FORCE_FRAME_UPLOAD			1
+
+#define FRAMES_PER_DESC		10
+#define FRAME_SIZE_PER_DESC	960	/* Shouldn't be hardcoded */
+#define CPIA_NUMSBUF		2
+#define STREAM_BUF_SIZE		(PAGE_SIZE * 4)
+#define SCRATCH_BUF_SIZE	(STREAM_BUF_SIZE * 2)
+
+struct cpia_sbuf {
+	char *data;
+	urb_t *urb;
+};
+
+#define FRAMEBUF_LEN (CPIA_MAX_FRAME_SIZE+100)
+enum framebuf_status {
+	FRAME_EMPTY,
+	FRAME_READING,
+	FRAME_READY,
+	FRAME_ERROR,
+};
+
+struct framebuf {
+	int length;
+	enum framebuf_status status;
+	u8 data[FRAMEBUF_LEN];
+	struct framebuf *next;
+};
+
+struct usb_cpia {
+	/* Device structure */
+	struct usb_device *dev;
+
+	unsigned char iface;
+	wait_queue_head_t wq_stream;
+
+	int cursbuf;		/* Current receiving sbuf */
+	struct cpia_sbuf sbuf[CPIA_NUMSBUF];		/* Double buffering */
+
+	int streaming;
+	int open;
+	int present;
+	struct framebuf *buffers[3];
+	struct framebuf *curbuff, *workbuff;
+};
+
+static int cpia_usb_open(void *privdata);
+static int cpia_usb_registerCallback(void *privdata, void (*cb) (void *cbdata),
+			             void *cbdata);
+static int cpia_usb_transferCmd(void *privdata, u8 *command, u8 *data);
+static int cpia_usb_streamStart(void *privdata);
+static int cpia_usb_streamStop(void *privdata);
+static int cpia_usb_streamRead(void *privdata, u8 *frame, int noblock);
+static int cpia_usb_close(void *privdata);
+
+#define ABOUT "USB driver for Vision CPiA based cameras"
+
+static struct cpia_camera_ops cpia_usb_ops = {
+	cpia_usb_open,
+	cpia_usb_registerCallback,
+	cpia_usb_transferCmd,
+	cpia_usb_streamStart,
+	cpia_usb_streamStop,
+	cpia_usb_streamRead,
+	cpia_usb_close,
+	0
+};
+
+static struct cam_data *cam_list;
+
+static void cpia_usb_complete(struct urb *urb)
+{
+	int i;
+	char *cdata;
+	struct usb_cpia *ucpia;
+
+	if (!urb || !urb->context)
+		return;
+
+	ucpia = (struct usb_cpia *) urb->context;
+
+	if (!ucpia->dev || !ucpia->streaming || !ucpia->present || !ucpia->open)
+		return;
+
+	if (ucpia->workbuff->status == FRAME_EMPTY) {
+		ucpia->workbuff->status = FRAME_READING;
+		ucpia->workbuff->length = 0;
+	}
+ 		  
+	for (i = 0; i < urb->number_of_packets; i++) {
+		int n = urb->iso_frame_desc[i].actual_length;
+		int st = urb->iso_frame_desc[i].status;
+
+		cdata = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
+
+		if (st)
+			printk(KERN_DEBUG "cpia data error: [%d] len=%d, status=%X\n", i, n, st);
+
+		if (FRAMEBUF_LEN < ucpia->workbuff->length + n) {
+			printk(KERN_DEBUG "cpia: scratch buf overflow!scr_len: %d, n: %d\n", ucpia->workbuff->length, n);
+			return;
+		}
+	    
+		if (n) {
+			if ((ucpia->workbuff->length > 0) || 
+			    (0x19 == cdata[0] && 0x68 == cdata[1])) {
+				memcpy(ucpia->workbuff->data + ucpia->workbuff->length, cdata, n);
+				ucpia->workbuff->length += n;
+			} else
+				DBG("Ignoring packet!\n");
+		} else {
+			if (ucpia->workbuff->length > 4 &&
+			    0xff == ucpia->workbuff->data[ucpia->workbuff->length-1] &&
+			    0xff == ucpia->workbuff->data[ucpia->workbuff->length-2] &&
+			    0xff == ucpia->workbuff->data[ucpia->workbuff->length-3] &&
+			    0xff == ucpia->workbuff->data[ucpia->workbuff->length-4]) {
+				ucpia->workbuff->status = FRAME_READY;
+				ucpia->curbuff = ucpia->workbuff;
+				ucpia->workbuff = ucpia->workbuff->next;
+				ucpia->workbuff->status = FRAME_EMPTY;
+				ucpia->workbuff->length = 0;
+		  
+				if (waitqueue_active(&ucpia->wq_stream))
+					wake_up_interruptible(&ucpia->wq_stream);
+			}
+		}
+	}
+}
+
+static int cpia_usb_open(void *privdata)
+{
+	struct usb_cpia *ucpia = (struct usb_cpia *) privdata;
+	urb_t *urb;
+	int ret, retval = 0, fx, err;
+  
+	if (!ucpia)
+		return -EINVAL;
+
+	ucpia->sbuf[0].data = kmalloc(FRAMES_PER_DESC * FRAME_SIZE_PER_DESC, GFP_KERNEL);
+	if (!ucpia->sbuf[0].data)
+		return -EINVAL;
+
+	ucpia->sbuf[1].data = kmalloc(FRAMES_PER_DESC * FRAME_SIZE_PER_DESC, GFP_KERNEL);
+	if (!ucpia->sbuf[1].data) {
+		retval = -EINVAL;
+		goto error_0;
+	}
+	
+	ret = usb_set_interface(ucpia->dev, ucpia->iface, 3);
+	if (ret < 0) {
+		printk(KERN_ERR "cpia_usb_open: usb_set_interface error (ret = %d)\n", ret);
+		retval = -EBUSY;
+		goto error_all;
+	}
+
+	ucpia->buffers[0]->status = FRAME_EMPTY;
+	ucpia->buffers[0]->length = 0;
+	ucpia->buffers[1]->status = FRAME_EMPTY;
+	ucpia->buffers[1]->length = 0;
+	ucpia->buffers[2]->status = FRAME_EMPTY;
+	ucpia->buffers[2]->length = 0;
+	ucpia->curbuff = ucpia->buffers[0];
+	ucpia->workbuff = ucpia->buffers[1];
+
+	/* We double buffer the Iso lists */
+	urb = usb_alloc_urb(FRAMES_PER_DESC);
+	if (!urb) {
+		printk(KERN_ERR "cpia_init_isoc: usb_alloc_urb 0\n");
+		retval = -ENOMEM;
+		goto error_all;
+	}
+
+	ucpia->sbuf[0].urb = urb;
+	urb->dev = ucpia->dev;
+	urb->context = ucpia;
+	urb->pipe = usb_rcvisocpipe(ucpia->dev, 1);
+	urb->transfer_flags = USB_ISO_ASAP;
+	urb->transfer_buffer = ucpia->sbuf[0].data;
+	urb->complete = cpia_usb_complete;
+	urb->number_of_packets = FRAMES_PER_DESC;
+	urb->transfer_buffer_length = FRAME_SIZE_PER_DESC * FRAMES_PER_DESC;
+	for (fx = 0; fx < FRAMES_PER_DESC; fx++) {
+		urb->iso_frame_desc[fx].offset = FRAME_SIZE_PER_DESC * fx;
+		urb->iso_frame_desc[fx].length = FRAME_SIZE_PER_DESC;
+	}
+
+	urb = usb_alloc_urb(FRAMES_PER_DESC);
+	if (!urb) {
+		printk(KERN_ERR "cpia_init_isoc: usb_alloc_urb 0\n");
+		retval = -ENOMEM;
+		goto error_all;
+	}
+
+	ucpia->sbuf[1].urb = urb;
+	urb->dev = ucpia->dev;
+	urb->context = ucpia;
+	urb->pipe = usb_rcvisocpipe(ucpia->dev, 1);
+	urb->transfer_flags = USB_ISO_ASAP;
+	urb->transfer_buffer = ucpia->sbuf[1].data;
+	urb->complete = cpia_usb_complete;
+	urb->number_of_packets = FRAMES_PER_DESC;
+	urb->transfer_buffer_length = FRAME_SIZE_PER_DESC * FRAMES_PER_DESC;
+	for (fx = 0; fx < FRAMES_PER_DESC; fx++) {
+		urb->iso_frame_desc[fx].offset = FRAME_SIZE_PER_DESC * fx;
+		urb->iso_frame_desc[fx].length = FRAME_SIZE_PER_DESC;
+	}
+
+	ucpia->sbuf[1].urb->next = ucpia->sbuf[0].urb;
+	ucpia->sbuf[0].urb->next = ucpia->sbuf[1].urb;
+	
+	err = usb_submit_urb(ucpia->sbuf[0].urb);
+	if (err)
+		printk(KERN_ERR "cpia_init_isoc: usb_submit_urb 0 ret %d\n",
+			err);
+	err = usb_submit_urb(ucpia->sbuf[1].urb);
+	if (err)
+		printk(KERN_ERR "cpia_init_isoc: usb_submit_urb 1 ret %d\n",
+			err);
+
+	ucpia->streaming = 1;
+	ucpia->open = 1;
+
+	return 0;
+
+error_all:
+	kfree (ucpia->sbuf[1].data);
+error_0:
+	kfree (ucpia->sbuf[0].data);
+	
+	return retval;
+}
+
+//
+// convenience functions
+//
+
+/****************************************************************************
+ *
+ *  WritePacket
+ *
+ ***************************************************************************/
+static int WritePacket(struct usb_device *udev, const u8 *packet, u8 *buf, size_t size)
+{
+	if (!packet)
+		return -EINVAL;
+
+	return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+			 packet[1] + (packet[0] << 8),
+			 USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			 packet[2] + (packet[3] << 8), 
+			 packet[4] + (packet[5] << 8), buf, size, HZ);
+}
+
+/****************************************************************************
+ *
+ *  ReadPacket
+ *
+ ***************************************************************************/
+static int ReadPacket(struct usb_device *udev, u8 *packet, u8 *buf, size_t size)
+{
+	if (!packet || size <= 0)
+		return -EINVAL;
+
+	return usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
+			 packet[1] + (packet[0] << 8),
+			 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			 packet[2] + (packet[3] << 8), 
+			 packet[4] + (packet[5] << 8), buf, size, HZ);
+}
+
+static int cpia_usb_transferCmd(void *privdata, u8 *command, u8 *data)
+{
+	int err = 0;
+	int databytes;
+	struct usb_cpia *ucpia = (struct usb_cpia *)privdata;
+	struct usb_device *udev = ucpia->dev;
+
+	if (!udev) {
+		DBG("Internal driver error: udev is NULL\n");
+		return -EINVAL;
+	}
+
+	if (!command) {
+		DBG("Internal driver error: command is NULL\n");
+		return -EINVAL;
+	}
+
+	databytes = (((int)command[7])<<8) | command[6];
+
+	if (command[0] == DATA_IN) {
+		u8 buffer[8];
+
+		if (!data) {
+			DBG("Internal driver error: data is NULL\n");
+			return -EINVAL;
+		}
+
+		err = ReadPacket(udev, command, buffer, 8);
+		if (err < 0)
+			return err;
+
+		memcpy(data, buffer, databytes);
+	} else if(command[0] == DATA_OUT)
+		WritePacket(udev, command, data, databytes);
+	else {
+		DBG("Unexpected first byte of command: %x\n", command[0]);
+		err = -EINVAL;
+	}
+
+	return 0;
+}
+
+static int cpia_usb_registerCallback(void *privdata, void (*cb) (void *cbdata),
+	void *cbdata)
+{
+	return -ENODEV;
+}
+
+static int cpia_usb_streamStart(void *privdata)
+{
+	return -ENODEV;
+}
+
+static int cpia_usb_streamStop(void *privdata)
+{
+	return -ENODEV;
+}
+
+static int cpia_usb_streamRead(void *privdata, u8 *frame, int noblock)
+{
+	struct usb_cpia *ucpia = (struct usb_cpia *) privdata;
+	struct framebuf *mybuff;
+
+	if (!ucpia || !ucpia->present)
+		return -1;
+  
+	if (ucpia->curbuff->status != FRAME_READY)
+		interruptible_sleep_on(&ucpia->wq_stream);
+	else
+		DBG("Frame already waiting!\n");
+
+	mybuff = ucpia->curbuff;
+
+	if (!mybuff)
+		return -1;
+  
+	if (mybuff->status != FRAME_READY || mybuff->length < 4) {
+		DBG("Something went wrong!\n");
+		return -1;
+	}
+
+	memcpy(frame, mybuff->data, mybuff->length);
+	mybuff->status = FRAME_EMPTY;
+  
+/*   DBG("read done, %d bytes, Header: %x/%x, Footer: %x%x%x%x\n",  */
+/*       mybuff->length, frame[0], frame[1], */
+/*       frame[mybuff->length-4], frame[mybuff->length-3],  */
+/*       frame[mybuff->length-2], frame[mybuff->length-1]); */
+
+	return mybuff->length;
+}
+
+static void cpia_usb_free_resources(struct usb_cpia *ucpia, int try)
+{
+	if (!ucpia->streaming)
+		return;
+
+	ucpia->streaming = 0;
+
+	/* Set packet size to 0 */
+	if (try) {
+		int ret;
+
+		ret = usb_set_interface(ucpia->dev, ucpia->iface, 0);
+		if (ret < 0) {
+			printk(KERN_ERR "usb_set_interface error (ret = %d)\n", ret);
+			return;
+		}
+	}
+
+	/* Unschedule all of the iso td's */
+	if (ucpia->sbuf[1].urb) {
+		usb_unlink_urb(ucpia->sbuf[1].urb);
+		usb_free_urb(ucpia->sbuf[1].urb);
+		ucpia->sbuf[1].urb = NULL;
+	}
+
+	if (ucpia->sbuf[0].urb) {
+		usb_unlink_urb(ucpia->sbuf[0].urb);
+		usb_free_urb(ucpia->sbuf[0].urb);
+		ucpia->sbuf[0].urb = NULL;
+	}
+}
+
+static int cpia_usb_close(void *privdata)
+{
+	struct usb_cpia *ucpia = (struct usb_cpia *) privdata;
+
+	ucpia->open = 0;
+
+	cpia_usb_free_resources(ucpia, 1);
+
+	if (!ucpia->present)
+		kfree(ucpia);
+
+	return 0;
+}
+
+int cpia_usb_init(void)
+{
+	/* return -ENODEV; */
+	return 0;
+}
+
+/* Probing and initializing */
+
+static void *cpia_probe(struct usb_device *udev, unsigned int ifnum)
+{
+	struct usb_interface_descriptor *interface;
+	struct usb_cpia *ucpia;
+	struct cam_data *cam;
+	int ret;
+  
+	/* A multi-config CPiA camera? */
+	if (udev->descriptor.bNumConfigurations != 1)
+		return NULL;
+
+	interface = &udev->actconfig->interface[ifnum].altsetting[0];
+
+	/* Is it a CPiA? */
+	if (udev->descriptor.idVendor != 0x0553)
+		return NULL;
+	if (udev->descriptor.idProduct != 0x0002)
+		return NULL;
+
+	/* We found a CPiA */
+	printk(KERN_INFO "USB CPiA camera found\n");
+
+	ucpia = kmalloc(sizeof(*ucpia), GFP_KERNEL);
+	if (!ucpia) {
+		printk(KERN_ERR "couldn't kmalloc cpia struct\n");
+		return NULL;
+	}
+
+	memset(ucpia, 0, sizeof(*ucpia));
+
+	ucpia->dev = udev;
+	ucpia->iface = interface->bInterfaceNumber;
+	init_waitqueue_head(&ucpia->wq_stream);
+
+	ucpia->buffers[0] = vmalloc(sizeof(*ucpia->buffers[0]));
+	if (!ucpia->buffers[0]) {
+		printk(KERN_ERR "couldn't vmalloc frame buffer 0\n");
+		goto fail_alloc_0;
+	}
+
+	ucpia->buffers[1] = vmalloc(sizeof(*ucpia->buffers[1]));
+	if (!ucpia->buffers[1]) {
+		printk(KERN_ERR "couldn't vmalloc frame buffer 1\n");
+		goto fail_alloc_1;
+	}
+
+	ucpia->buffers[2] = vmalloc(sizeof(*ucpia->buffers[2]));
+	if (!ucpia->buffers[2]) {
+		printk(KERN_ERR "couldn't vmalloc frame buffer 2\n");
+		goto fail_alloc_2;
+	}
+
+	ucpia->buffers[0]->next = ucpia->buffers[1];
+	ucpia->buffers[1]->next = ucpia->buffers[2];
+	ucpia->buffers[2]->next = ucpia->buffers[0];
+
+	ret = usb_set_interface(udev, ucpia->iface, 0);
+	if (ret < 0) {
+		printk(KERN_ERR "cpia_probe: usb_set_interface error (ret = %d)\n", ret);
+		/* goto fail_all; */
+	}
+
+	/* Before register_camera, important */
+	ucpia->present = 1;
+  
+	cam = cpia_register_camera(&cpia_usb_ops, ucpia);
+	if (!cam) {
+		LOG("failed to cpia_register_camera\n");
+		goto fail_all;
+	}
+
+	ADD_TO_LIST(cam_list, cam);
+
+	return cam;
+
+fail_all:
+	vfree(ucpia->buffers[2]);
+	ucpia->buffers[2] = NULL;
+fail_alloc_2:
+	vfree(ucpia->buffers[1]);
+	ucpia->buffers[1] = NULL;
+fail_alloc_1:
+	vfree(ucpia->buffers[0]);
+	ucpia->buffers[0] = NULL;
+fail_alloc_0:
+
+	return NULL;
+}
+
+static void cpia_disconnect(struct usb_device *dev, void *ptr);
+
+static struct usb_driver cpia_driver = {
+	"cpia",
+	cpia_probe,
+	cpia_disconnect,
+	{ NULL, NULL }
+};
+
+/* don't use dev, it may be NULL! (see usb_cpia_cleanup) */
+/* _disconnect from usb_cpia_cleanup is not necessary since usb_deregister */
+/* will do it for us as well as passing a udev structure - jerdfelt */
+static void cpia_disconnect(struct usb_device *udev, void *ptr)
+{
+	struct cam_data *cam = (struct cam_data *) ptr;
+	struct usb_cpia *ucpia = (struct usb_cpia *) cam->lowlevel_data;
+  
+	REMOVE_FROM_LIST(cam);
+
+	/* Don't even try to reset the altsetting if we're disconnected */
+	cpia_usb_free_resources(ucpia, 0);
+
+	ucpia->present = 0;
+
+	cpia_unregister_camera(cam);
+
+	ucpia->curbuff->status = FRAME_ERROR;
+
+	if (waitqueue_active(&ucpia->wq_stream))
+		wake_up_interruptible(&ucpia->wq_stream);
+
+	usb_driver_release_interface(&cpia_driver,
+				     &udev->actconfig->interface[0]);
+
+	ucpia->curbuff = ucpia->workbuff = NULL;
+
+	if (ucpia->buffers[2]) {
+		vfree(ucpia->buffers[2]);
+		ucpia->buffers[2] = NULL;
+	}
+
+	if (ucpia->buffers[1]) {
+		vfree(ucpia->buffers[1]);
+		ucpia->buffers[1] = NULL;
+	}
+
+	if (ucpia->buffers[0]) {
+		vfree(ucpia->buffers[0]);
+		ucpia->buffers[0] = NULL;
+	}
+
+	if (!ucpia->open)
+		kfree(ucpia);
+}
+
+int usb_cpia_init(void)
+{
+	cam_list = NULL;
+
+	return usb_register(&cpia_driver);
+}
+
+void usb_cpia_cleanup(void)
+{
+/*
+	struct cam_data *cam;
+
+	while ((cam = cam_list) != NULL)
+		cpia_disconnect(NULL, cam);
+*/
+
+	usb_deregister(&cpia_driver);
+}
+
+#ifdef MODULE
+int init_module(void)
+{
+	return usb_cpia_init();
+}
+
+void cleanup_module(void)
+{
+	usb_cpia_cleanup();
+}
+#endif /* !MODULE */