diff options
Diffstat (limited to 'drivers/media/dvb/dvb-usb/dvb-usb-urb.c')
| -rw-r--r-- | drivers/media/dvb/dvb-usb/dvb-usb-urb.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/drivers/media/dvb/dvb-usb/dvb-usb-urb.c b/drivers/media/dvb/dvb-usb/dvb-usb-urb.c new file mode 100644 index 00000000000..83d476fb410 --- /dev/null +++ b/drivers/media/dvb/dvb-usb/dvb-usb-urb.c @@ -0,0 +1,211 @@ +/* dvb-usb-urb.c is part of the DVB USB library. + * + * Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@desy.de) + * see dvb-usb-init.c for copyright information. + * + * This file contains functions for initializing and handling the + * USB and URB stuff. + */ +#include "dvb-usb-common.h" + +int dvb_usb_generic_rw(struct dvb_usb_device *d, u8 *wbuf, u16 wlen, u8 *rbuf, + u16 rlen, int delay_ms) +{ + int actlen,ret = -ENOMEM; + + if (d->props.generic_bulk_ctrl_endpoint == 0) { + err("endpoint for generic control not specified."); + return -EINVAL; + } + + if (wbuf == NULL || wlen == 0) + return -EINVAL; + + if ((ret = down_interruptible(&d->usb_sem))) + return ret; + + debug_dump(wbuf,wlen,deb_xfer); + + ret = usb_bulk_msg(d->udev,usb_sndbulkpipe(d->udev, + d->props.generic_bulk_ctrl_endpoint), wbuf,wlen,&actlen, + 2*HZ); + + if (ret) + err("bulk message failed: %d (%d/%d)",ret,wlen,actlen); + else + ret = actlen != wlen ? -1 : 0; + + /* an answer is expected, and no error before */ + if (!ret && rbuf && rlen) { + if (delay_ms) + msleep(delay_ms); + + ret = usb_bulk_msg(d->udev,usb_rcvbulkpipe(d->udev, + d->props.generic_bulk_ctrl_endpoint),rbuf,rlen,&actlen, + 2*HZ); + + if (ret) + err("recv bulk message failed: %d",ret); + else + debug_dump(rbuf,actlen,deb_xfer); + } + + up(&d->usb_sem); + return ret; +} +EXPORT_SYMBOL(dvb_usb_generic_rw); + +int dvb_usb_generic_write(struct dvb_usb_device *d, u8 *buf, u16 len) +{ + return dvb_usb_generic_rw(d,buf,len,NULL,0,0); +} +EXPORT_SYMBOL(dvb_usb_generic_write); + +static void dvb_usb_bulk_urb_complete(struct urb *urb, struct pt_regs *ptregs) +{ + struct dvb_usb_device *d = urb->context; + + deb_ts("bulk urb completed. feedcount: %d, status: %d, length: %d\n",d->feedcount,urb->status, + urb->actual_length); + + switch (urb->status) { + case 0: /* success */ + case -ETIMEDOUT: /* NAK */ + break; + case -ECONNRESET: /* kill */ + case -ENOENT: + case -ESHUTDOWN: + return; + default: /* error */ + deb_ts("urb completition error %d.", urb->status); + break; + } + + if (d->feedcount > 0 && urb->actual_length > 0) { + if (d->state & DVB_USB_STATE_DVB) + dvb_dmx_swfilter(&d->demux, (u8*) urb->transfer_buffer,urb->actual_length); + } else + deb_ts("URB dropped because of feedcount.\n"); + + usb_submit_urb(urb,GFP_ATOMIC); +} + +int dvb_usb_urb_kill(struct dvb_usb_device *d) +{ + int i; + for (i = 0; i < d->urbs_submitted; i++) { + deb_info("killing URB no. %d.\n",i); + + /* stop the URB */ + usb_kill_urb(d->urb_list[i]); + } + d->urbs_submitted = 0; + return 0; +} + +int dvb_usb_urb_submit(struct dvb_usb_device *d) +{ + int i,ret; + for (i = 0; i < d->urbs_initialized; i++) { + deb_info("submitting URB no. %d\n",i); + if ((ret = usb_submit_urb(d->urb_list[i],GFP_ATOMIC))) { + err("could not submit URB no. %d - get them all back\n",i); + dvb_usb_urb_kill(d); + return ret; + } + d->urbs_submitted++; + } + return 0; +} + +static int dvb_usb_bulk_urb_init(struct dvb_usb_device *d) +{ + int i,bufsize = d->props.urb.count * d->props.urb.u.bulk.buffersize; + + deb_info("allocate %d bytes as buffersize for all URBs\n",bufsize); + /* allocate the actual buffer for the URBs */ + if ((d->buffer = usb_buffer_alloc(d->udev, bufsize, SLAB_ATOMIC, &d->dma_handle)) == NULL) { + deb_info("not enough memory for urb-buffer allocation.\n"); + return -ENOMEM; + } + deb_info("allocation successful\n"); + memset(d->buffer,0,bufsize); + + d->state |= DVB_USB_STATE_URB_BUF; + + /* allocate the URBs */ + for (i = 0; i < d->props.urb.count; i++) { + if (!(d->urb_list[i] = usb_alloc_urb(0,GFP_ATOMIC))) { + return -ENOMEM; + } + + usb_fill_bulk_urb( d->urb_list[i], d->udev, + usb_rcvbulkpipe(d->udev,d->props.urb.endpoint), + &d->buffer[i*d->props.urb.u.bulk.buffersize], + d->props.urb.u.bulk.buffersize, + dvb_usb_bulk_urb_complete, d); + + d->urb_list[i]->transfer_flags = 0; + d->urbs_initialized++; + } + return 0; +} + +int dvb_usb_urb_init(struct dvb_usb_device *d) +{ + /* + * when reloading the driver w/o replugging the device + * sometimes a timeout occures, this helps + */ + if (d->props.generic_bulk_ctrl_endpoint != 0) { + usb_clear_halt(d->udev,usb_sndbulkpipe(d->udev,d->props.generic_bulk_ctrl_endpoint)); + usb_clear_halt(d->udev,usb_rcvbulkpipe(d->udev,d->props.generic_bulk_ctrl_endpoint)); + } + usb_clear_halt(d->udev,usb_rcvbulkpipe(d->udev,d->props.urb.endpoint)); + + /* allocate the array for the data transfer URBs */ + d->urb_list = kmalloc(d->props.urb.count * sizeof(struct urb *),GFP_KERNEL); + if (d->urb_list == NULL) + return -ENOMEM; + memset(d->urb_list,0,d->props.urb.count * sizeof(struct urb *)); + d->state |= DVB_USB_STATE_URB_LIST; + + switch (d->props.urb.type) { + case DVB_USB_BULK: + return dvb_usb_bulk_urb_init(d); + case DVB_USB_ISOC: + err("isochronous transfer not yet implemented in dvb-usb."); + return -EINVAL; + default: + err("unkown URB-type for data transfer."); + return -EINVAL; + } +} + +int dvb_usb_urb_exit(struct dvb_usb_device *d) +{ + int i; + + dvb_usb_urb_kill(d); + + if (d->state & DVB_USB_STATE_URB_LIST) { + for (i = 0; i < d->urbs_initialized; i++) { + if (d->urb_list[i] != NULL) { + deb_info("freeing URB no. %d.\n",i); + /* free the URBs */ + usb_free_urb(d->urb_list[i]); + } + } + d->urbs_initialized = 0; + /* free the urb array */ + kfree(d->urb_list); + d->state &= ~DVB_USB_STATE_URB_LIST; + } + + if (d->state & DVB_USB_STATE_URB_BUF) + usb_buffer_free(d->udev, d->props.urb.u.bulk.buffersize * d->props.urb.count, + d->buffer, d->dma_handle); + + d->state &= ~DVB_USB_STATE_URB_BUF; + return 0; +} |