diff options
Diffstat (limited to 'drivers/isdn/hisax/st5481_b.c')
| -rw-r--r-- | drivers/isdn/hisax/st5481_b.c | 380 |
1 files changed, 380 insertions, 0 deletions
diff --git a/drivers/isdn/hisax/st5481_b.c b/drivers/isdn/hisax/st5481_b.c new file mode 100644 index 00000000..40984916 --- /dev/null +++ b/drivers/isdn/hisax/st5481_b.c @@ -0,0 +1,380 @@ +/* + * Driver for ST5481 USB ISDN modem + * + * Author Frode Isaksen + * Copyright 2001 by Frode Isaksen <fisaksen@bewan.com> + * 2001 by Kai Germaschewski <kai.germaschewski@gmx.de> + * + * This software may be used and distributed according to the terms + * of the GNU General Public License, incorporated herein by reference. + * + */ + +#include <linux/init.h> +#include <linux/gfp.h> +#include <linux/usb.h> +#include <linux/netdevice.h> +#include <linux/bitrev.h> +#include "st5481.h" + +static inline void B_L1L2(struct st5481_bcs *bcs, int pr, void *arg) +{ + struct hisax_if *ifc = (struct hisax_if *) &bcs->b_if; + + ifc->l1l2(ifc, pr, arg); +} + +/* + * Encode and transmit next frame. + */ +static void usb_b_out(struct st5481_bcs *bcs, int buf_nr) +{ + struct st5481_b_out *b_out = &bcs->b_out; + struct st5481_adapter *adapter = bcs->adapter; + struct urb *urb; + unsigned int packet_size, offset; + int len, buf_size, bytes_sent; + int i; + struct sk_buff *skb; + + if (test_and_set_bit(buf_nr, &b_out->busy)) { + DBG(4, "ep %d urb %d busy", (bcs->channel + 1) * 2, buf_nr); + return; + } + urb = b_out->urb[buf_nr]; + + // Adjust isoc buffer size according to flow state + if (b_out->flow_event & (OUT_DOWN | OUT_UNDERRUN)) { + buf_size = NUM_ISO_PACKETS_B * SIZE_ISO_PACKETS_B_OUT + B_FLOW_ADJUST; + packet_size = SIZE_ISO_PACKETS_B_OUT + B_FLOW_ADJUST; + DBG(4, "B%d,adjust flow,add %d bytes", bcs->channel + 1, B_FLOW_ADJUST); + } else if (b_out->flow_event & OUT_UP) { + buf_size = NUM_ISO_PACKETS_B * SIZE_ISO_PACKETS_B_OUT - B_FLOW_ADJUST; + packet_size = SIZE_ISO_PACKETS_B_OUT - B_FLOW_ADJUST; + DBG(4, "B%d,adjust flow,remove %d bytes", bcs->channel + 1, B_FLOW_ADJUST); + } else { + buf_size = NUM_ISO_PACKETS_B * SIZE_ISO_PACKETS_B_OUT; + packet_size = 8; + } + b_out->flow_event = 0; + + len = 0; + while (len < buf_size) { + if ((skb = b_out->tx_skb)) { + DBG_SKB(0x100, skb); + DBG(4, "B%d,len=%d", bcs->channel + 1, skb->len); + + if (bcs->mode == L1_MODE_TRANS) { + bytes_sent = buf_size - len; + if (skb->len < bytes_sent) + bytes_sent = skb->len; + { /* swap tx bytes to get hearable audio data */ + register unsigned char *src = skb->data; + register unsigned char *dest = urb->transfer_buffer + len; + register unsigned int count; + for (count = 0; count < bytes_sent; count++) + *dest++ = bitrev8(*src++); + } + len += bytes_sent; + } else { + len += isdnhdlc_encode(&b_out->hdlc_state, + skb->data, skb->len, &bytes_sent, + urb->transfer_buffer + len, buf_size-len); + } + + skb_pull(skb, bytes_sent); + + if (!skb->len) { + // Frame sent + b_out->tx_skb = NULL; + B_L1L2(bcs, PH_DATA | CONFIRM, (void *)(unsigned long) skb->truesize); + dev_kfree_skb_any(skb); + +/* if (!(bcs->tx_skb = skb_dequeue(&bcs->sq))) { */ +/* st5481B_sched_event(bcs, B_XMTBUFREADY); */ +/* } */ + } + } else { + if (bcs->mode == L1_MODE_TRANS) { + memset(urb->transfer_buffer + len, 0xff, buf_size-len); + len = buf_size; + } else { + // Send flags + len += isdnhdlc_encode(&b_out->hdlc_state, + NULL, 0, &bytes_sent, + urb->transfer_buffer + len, buf_size-len); + } + } + } + + // Prepare the URB + for (i = 0, offset = 0; offset < len; i++) { + urb->iso_frame_desc[i].offset = offset; + urb->iso_frame_desc[i].length = packet_size; + offset += packet_size; + packet_size = SIZE_ISO_PACKETS_B_OUT; + } + urb->transfer_buffer_length = len; + urb->number_of_packets = i; + urb->dev = adapter->usb_dev; + + DBG_ISO_PACKET(0x200, urb); + + SUBMIT_URB(urb, GFP_NOIO); +} + +/* + * Start transferring (flags or data) on the B channel, since + * FIFO counters has been set to a non-zero value. + */ +static void st5481B_start_xfer(void *context) +{ + struct st5481_bcs *bcs = context; + + DBG(4, "B%d", bcs->channel + 1); + + // Start transmitting (flags or data) on B channel + + usb_b_out(bcs, 0); + usb_b_out(bcs, 1); +} + +/* + * If the adapter has only 2 LEDs, the green + * LED will blink with a rate depending + * on the number of channels opened. + */ +static void led_blink(struct st5481_adapter *adapter) +{ + u_char leds = adapter->leds; + + // 50 frames/sec for each channel + if (++adapter->led_counter % 50) { + return; + } + + if (adapter->led_counter % 100) { + leds |= GREEN_LED; + } else { + leds &= ~GREEN_LED; + } + + st5481_usb_device_ctrl_msg(adapter, GPIO_OUT, leds, NULL, NULL); +} + +static void usb_b_out_complete(struct urb *urb) +{ + struct st5481_bcs *bcs = urb->context; + struct st5481_b_out *b_out = &bcs->b_out; + struct st5481_adapter *adapter = bcs->adapter; + int buf_nr; + + buf_nr = get_buf_nr(b_out->urb, urb); + test_and_clear_bit(buf_nr, &b_out->busy); + + if (unlikely(urb->status < 0)) { + switch (urb->status) { + case -ENOENT: + case -ESHUTDOWN: + case -ECONNRESET: + DBG(4, "urb killed status %d", urb->status); + return; // Give up + default: + WARNING("urb status %d", urb->status); + if (b_out->busy == 0) { + st5481_usb_pipe_reset(adapter, (bcs->channel + 1) * 2 | USB_DIR_OUT, NULL, NULL); + } + break; + } + } + + usb_b_out(bcs, buf_nr); + + if (adapter->number_of_leds == 2) + led_blink(adapter); +} + +/* + * Start or stop the transfer on the B channel. + */ +static void st5481B_mode(struct st5481_bcs *bcs, int mode) +{ + struct st5481_b_out *b_out = &bcs->b_out; + struct st5481_adapter *adapter = bcs->adapter; + + DBG(4, "B%d,mode=%d", bcs->channel + 1, mode); + + if (bcs->mode == mode) + return; + + bcs->mode = mode; + + // Cancel all USB transfers on this B channel + usb_unlink_urb(b_out->urb[0]); + usb_unlink_urb(b_out->urb[1]); + b_out->busy = 0; + + st5481_in_mode(&bcs->b_in, mode); + if (bcs->mode != L1_MODE_NULL) { + // Open the B channel + if (bcs->mode != L1_MODE_TRANS) { + u32 features = HDLC_BITREVERSE; + if (bcs->mode == L1_MODE_HDLC_56K) + features |= HDLC_56KBIT; + isdnhdlc_out_init(&b_out->hdlc_state, features); + } + st5481_usb_pipe_reset(adapter, (bcs->channel + 1) * 2, NULL, NULL); + + // Enable B channel interrupts + st5481_usb_device_ctrl_msg(adapter, FFMSK_B1 + (bcs->channel * 2), + OUT_UP + OUT_DOWN + OUT_UNDERRUN, NULL, NULL); + + // Enable B channel FIFOs + st5481_usb_device_ctrl_msg(adapter, OUT_B1_COUNTER+(bcs->channel * 2), 32, st5481B_start_xfer, bcs); + if (adapter->number_of_leds == 4) { + if (bcs->channel == 0) { + adapter->leds |= B1_LED; + } else { + adapter->leds |= B2_LED; + } + } + } else { + // Disble B channel interrupts + st5481_usb_device_ctrl_msg(adapter, FFMSK_B1+(bcs->channel * 2), 0, NULL, NULL); + + // Disable B channel FIFOs + st5481_usb_device_ctrl_msg(adapter, OUT_B1_COUNTER+(bcs->channel * 2), 0, NULL, NULL); + + if (adapter->number_of_leds == 4) { + if (bcs->channel == 0) { + adapter->leds &= ~B1_LED; + } else { + adapter->leds &= ~B2_LED; + } + } else { + st5481_usb_device_ctrl_msg(adapter, GPIO_OUT, adapter->leds, NULL, NULL); + } + if (b_out->tx_skb) { + dev_kfree_skb_any(b_out->tx_skb); + b_out->tx_skb = NULL; + } + + } +} + +static int st5481_setup_b_out(struct st5481_bcs *bcs) +{ + struct usb_device *dev = bcs->adapter->usb_dev; + struct usb_interface *intf; + struct usb_host_interface *altsetting = NULL; + struct usb_host_endpoint *endpoint; + struct st5481_b_out *b_out = &bcs->b_out; + + DBG(4, ""); + + intf = usb_ifnum_to_if(dev, 0); + if (intf) + altsetting = usb_altnum_to_altsetting(intf, 3); + if (!altsetting) + return -ENXIO; + + // Allocate URBs and buffers for the B channel out + endpoint = &altsetting->endpoint[EP_B1_OUT - 1 + bcs->channel * 2]; + + DBG(4, "endpoint address=%02x,packet size=%d", + endpoint->desc.bEndpointAddress, le16_to_cpu(endpoint->desc.wMaxPacketSize)); + + // Allocate memory for 8000bytes/sec + extra bytes if underrun + return st5481_setup_isocpipes(b_out->urb, dev, + usb_sndisocpipe(dev, endpoint->desc.bEndpointAddress), + NUM_ISO_PACKETS_B, SIZE_ISO_PACKETS_B_OUT, + NUM_ISO_PACKETS_B * SIZE_ISO_PACKETS_B_OUT + B_FLOW_ADJUST, + usb_b_out_complete, bcs); +} + +static void st5481_release_b_out(struct st5481_bcs *bcs) +{ + struct st5481_b_out *b_out = &bcs->b_out; + + DBG(4, ""); + + st5481_release_isocpipes(b_out->urb); +} + +int st5481_setup_b(struct st5481_bcs *bcs) +{ + int retval; + + DBG(4, ""); + + retval = st5481_setup_b_out(bcs); + if (retval) + goto err; + bcs->b_in.bufsize = HSCX_BUFMAX; + bcs->b_in.num_packets = NUM_ISO_PACKETS_B; + bcs->b_in.packet_size = SIZE_ISO_PACKETS_B_IN; + bcs->b_in.ep = (bcs->channel ? EP_B2_IN : EP_B1_IN) | USB_DIR_IN; + bcs->b_in.counter = bcs->channel ? IN_B2_COUNTER : IN_B1_COUNTER; + bcs->b_in.adapter = bcs->adapter; + bcs->b_in.hisax_if = &bcs->b_if.ifc; + retval = st5481_setup_in(&bcs->b_in); + if (retval) + goto err_b_out; + + + return 0; + +err_b_out: + st5481_release_b_out(bcs); +err: + return retval; +} + +/* + * Release buffers and URBs for the B channels + */ +void st5481_release_b(struct st5481_bcs *bcs) +{ + DBG(4, ""); + + st5481_release_in(&bcs->b_in); + st5481_release_b_out(bcs); +} + +/* + * st5481_b_l2l1 is the entry point for upper layer routines that want to + * transmit on the B channel. PH_DATA | REQUEST is a normal packet that + * we either start transmitting (if idle) or queue (if busy). + * PH_PULL | REQUEST can be called to request a callback message + * (PH_PULL | CONFIRM) + * once the link is idle. After a "pull" callback, the upper layer + * routines can use PH_PULL | INDICATION to send data. + */ +void st5481_b_l2l1(struct hisax_if *ifc, int pr, void *arg) +{ + struct st5481_bcs *bcs = ifc->priv; + struct sk_buff *skb = arg; + long mode; + + DBG(4, ""); + + switch (pr) { + case PH_DATA | REQUEST: + BUG_ON(bcs->b_out.tx_skb); + bcs->b_out.tx_skb = skb; + break; + case PH_ACTIVATE | REQUEST: + mode = (long) arg; + DBG(4, "B%d,PH_ACTIVATE_REQUEST %ld", bcs->channel + 1, mode); + st5481B_mode(bcs, mode); + B_L1L2(bcs, PH_ACTIVATE | INDICATION, NULL); + break; + case PH_DEACTIVATE | REQUEST: + DBG(4, "B%d,PH_DEACTIVATE_REQUEST", bcs->channel + 1); + st5481B_mode(bcs, L1_MODE_NULL); + B_L1L2(bcs, PH_DEACTIVATE | INDICATION, NULL); + break; + default: + WARNING("pr %#x\n", pr); + } +} |