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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/isdn/hisax/st5481_usb.c | |
download | kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/isdn/hisax/st5481_usb.c')
-rw-r--r-- | drivers/isdn/hisax/st5481_usb.c | 650 |
1 files changed, 650 insertions, 0 deletions
diff --git a/drivers/isdn/hisax/st5481_usb.c b/drivers/isdn/hisax/st5481_usb.c new file mode 100644 index 0000000..2369180 --- /dev/null +++ b/drivers/isdn/hisax/st5481_usb.c @@ -0,0 +1,650 @@ +/* + * 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/usb.h> +#include <linux/slab.h> +#include "st5481.h" + +/* ====================================================================== + * control pipe + */ + +/* + * Send the next endpoint 0 request stored in the FIFO. + * Called either by the completion or by usb_ctrl_msg. + */ +static void usb_next_ctrl_msg(struct urb *urb, + struct st5481_adapter *adapter) +{ + struct st5481_ctrl *ctrl = &adapter->ctrl; + int r_index; + + if (test_and_set_bit(0, &ctrl->busy)) { + return; + } + + if ((r_index = fifo_remove(&ctrl->msg_fifo.f)) < 0) { + test_and_clear_bit(0,&ctrl->busy); + return; + } + urb->setup_packet = + (unsigned char *)&ctrl->msg_fifo.data[r_index]; + + DBG(1,"request=0x%02x,value=0x%04x,index=%x", + ((struct ctrl_msg *)urb->setup_packet)->dr.bRequest, + ((struct ctrl_msg *)urb->setup_packet)->dr.wValue, + ((struct ctrl_msg *)urb->setup_packet)->dr.wIndex); + + // Prepare the URB + urb->dev = adapter->usb_dev; + + SUBMIT_URB(urb, GFP_ATOMIC); +} + +/* + * Asynchronous endpoint 0 request (async version of usb_control_msg). + * The request will be queued up in a FIFO if the endpoint is busy. + */ +void usb_ctrl_msg(struct st5481_adapter *adapter, + u8 request, u8 requesttype, u16 value, u16 index, + ctrl_complete_t complete, void *context) +{ + struct st5481_ctrl *ctrl = &adapter->ctrl; + int w_index; + struct ctrl_msg *ctrl_msg; + + if ((w_index = fifo_add(&ctrl->msg_fifo.f)) < 0) { + WARN("control msg FIFO full"); + return; + } + ctrl_msg = &ctrl->msg_fifo.data[w_index]; + + ctrl_msg->dr.bRequestType = requesttype; + ctrl_msg->dr.bRequest = request; + ctrl_msg->dr.wValue = cpu_to_le16p(&value); + ctrl_msg->dr.wIndex = cpu_to_le16p(&index); + ctrl_msg->dr.wLength = 0; + ctrl_msg->complete = complete; + ctrl_msg->context = context; + + usb_next_ctrl_msg(ctrl->urb, adapter); +} + +/* + * Asynchronous endpoint 0 device request. + */ +void st5481_usb_device_ctrl_msg(struct st5481_adapter *adapter, + u8 request, u16 value, + ctrl_complete_t complete, void *context) +{ + usb_ctrl_msg(adapter, request, + USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, + value, 0, complete, context); +} + +/* + * Asynchronous pipe reset (async version of usb_clear_halt). + */ +void st5481_usb_pipe_reset(struct st5481_adapter *adapter, + u_char pipe, + ctrl_complete_t complete, void *context) +{ + DBG(1,"pipe=%02x",pipe); + + usb_ctrl_msg(adapter, + USB_REQ_CLEAR_FEATURE, USB_DIR_OUT | USB_RECIP_ENDPOINT, + 0, pipe, complete, context); +} + + +/* + Physical level functions +*/ + +void st5481_ph_command(struct st5481_adapter *adapter, unsigned int command) +{ + DBG(8,"command=%s", ST5481_CMD_string(command)); + + st5481_usb_device_ctrl_msg(adapter, TXCI, command, NULL, NULL); +} + +/* + * The request on endpoint 0 has completed. + * Call the user provided completion routine and try + * to send the next request. + */ +static void usb_ctrl_complete(struct urb *urb, struct pt_regs *regs) +{ + struct st5481_adapter *adapter = urb->context; + struct st5481_ctrl *ctrl = &adapter->ctrl; + struct ctrl_msg *ctrl_msg; + + if (unlikely(urb->status < 0)) { + if (urb->status != -ENOENT && urb->status != -ESHUTDOWN) { + WARN("urb status %d",urb->status); + } else { + DBG(1,"urb killed"); + return; // Give up + } + } + + ctrl_msg = (struct ctrl_msg *)urb->setup_packet; + + if (ctrl_msg->dr.bRequest == USB_REQ_CLEAR_FEATURE) { + /* Special case handling for pipe reset */ + le16_to_cpus(&ctrl_msg->dr.wIndex); + + /* toggle is reset on clear */ + usb_settoggle(adapter->usb_dev, + ctrl_msg->dr.wIndex & ~USB_DIR_IN, + (ctrl_msg->dr.wIndex & USB_DIR_IN) == 0, + 0); + + + } + + if (ctrl_msg->complete) + ctrl_msg->complete(ctrl_msg->context); + + clear_bit(0, &ctrl->busy); + + // Try to send next control message + usb_next_ctrl_msg(urb, adapter); + return; +} + +/* ====================================================================== + * interrupt pipe + */ + +/* + * The interrupt endpoint will be called when any + * of the 6 registers changes state (depending on masks). + * Decode the register values and schedule a private event. + * Called at interrupt. + */ +static void usb_int_complete(struct urb *urb, struct pt_regs *regs) +{ + u8 *data = urb->transfer_buffer; + u8 irqbyte; + struct st5481_adapter *adapter = urb->context; + int j; + int status; + + switch (urb->status) { + case 0: + /* success */ + break; + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + /* this urb is terminated, clean up */ + DBG(1, "urb shutting down with status: %d", urb->status); + return; + default: + WARN("nonzero urb status received: %d", urb->status); + goto exit; + } + + + DBG_PACKET(1, data, INT_PKT_SIZE); + + if (urb->actual_length == 0) { + goto exit; + } + + irqbyte = data[MPINT]; + if (irqbyte & DEN_INT) + FsmEvent(&adapter->d_out.fsm, EV_DOUT_DEN, NULL); + + if (irqbyte & DCOLL_INT) + FsmEvent(&adapter->d_out.fsm, EV_DOUT_COLL, NULL); + + irqbyte = data[FFINT_D]; + if (irqbyte & OUT_UNDERRUN) + FsmEvent(&adapter->d_out.fsm, EV_DOUT_UNDERRUN, NULL); + + if (irqbyte & OUT_DOWN) +;// printk("OUT_DOWN\n"); + + irqbyte = data[MPINT]; + if (irqbyte & RXCI_INT) + FsmEvent(&adapter->l1m, data[CCIST] & 0x0f, NULL); + + for (j = 0; j < 2; j++) + adapter->bcs[j].b_out.flow_event |= data[FFINT_B1 + j]; + + urb->actual_length = 0; + +exit: + status = usb_submit_urb (urb, GFP_ATOMIC); + if (status) + WARN("usb_submit_urb failed with result %d", status); +} + +/* ====================================================================== + * initialization + */ + +int st5481_setup_usb(struct st5481_adapter *adapter) +{ + struct usb_device *dev = adapter->usb_dev; + struct st5481_ctrl *ctrl = &adapter->ctrl; + struct st5481_intr *intr = &adapter->intr; + struct usb_interface *intf; + struct usb_host_interface *altsetting = NULL; + struct usb_host_endpoint *endpoint; + int status; + struct urb *urb; + u8 *buf; + + DBG(1,""); + + if ((status = usb_reset_configuration (dev)) < 0) { + WARN("reset_configuration failed,status=%d",status); + return status; + } + + intf = usb_ifnum_to_if(dev, 0); + if (intf) + altsetting = usb_altnum_to_altsetting(intf, 3); + if (!altsetting) + return -ENXIO; + + // Check if the config is sane + if ( altsetting->desc.bNumEndpoints != 7 ) { + WARN("expecting 7 got %d endpoints!", altsetting->desc.bNumEndpoints); + return -EINVAL; + } + + // The descriptor is wrong for some early samples of the ST5481 chip + altsetting->endpoint[3].desc.wMaxPacketSize = __constant_cpu_to_le16(32); + altsetting->endpoint[4].desc.wMaxPacketSize = __constant_cpu_to_le16(32); + + // Use alternative setting 3 on interface 0 to have 2B+D + if ((status = usb_set_interface (dev, 0, 3)) < 0) { + WARN("usb_set_interface failed,status=%d",status); + return status; + } + + // Allocate URB for control endpoint + urb = usb_alloc_urb(0, GFP_KERNEL); + if (!urb) { + return -ENOMEM; + } + ctrl->urb = urb; + + // Fill the control URB + usb_fill_control_urb (urb, dev, + usb_sndctrlpipe(dev, 0), + NULL, NULL, 0, usb_ctrl_complete, adapter); + + + fifo_init(&ctrl->msg_fifo.f, ARRAY_SIZE(ctrl->msg_fifo.data)); + + // Allocate URBs and buffers for interrupt endpoint + urb = usb_alloc_urb(0, GFP_KERNEL); + if (!urb) { + return -ENOMEM; + } + intr->urb = urb; + + buf = kmalloc(INT_PKT_SIZE, GFP_KERNEL); + if (!buf) { + return -ENOMEM; + } + + endpoint = &altsetting->endpoint[EP_INT-1]; + + // Fill the interrupt URB + usb_fill_int_urb(urb, dev, + usb_rcvintpipe(dev, endpoint->desc.bEndpointAddress), + buf, INT_PKT_SIZE, + usb_int_complete, adapter, + endpoint->desc.bInterval); + + return 0; +} + +/* + * Release buffers and URBs for the interrupt and control + * endpoint. + */ +void st5481_release_usb(struct st5481_adapter *adapter) +{ + struct st5481_intr *intr = &adapter->intr; + struct st5481_ctrl *ctrl = &adapter->ctrl; + + DBG(1,""); + + // Stop and free Control and Interrupt URBs + usb_unlink_urb(ctrl->urb); + if (ctrl->urb->transfer_buffer) + kfree(ctrl->urb->transfer_buffer); + usb_free_urb(ctrl->urb); + + usb_unlink_urb(intr->urb); + if (intr->urb->transfer_buffer) + kfree(intr->urb->transfer_buffer); + usb_free_urb(intr->urb); +} + +/* + * Initialize the adapter. + */ +void st5481_start(struct st5481_adapter *adapter) +{ + static const u8 init_cmd_table[]={ + SET_DEFAULT,0, + STT,0, + SDA_MIN,0x0d, + SDA_MAX,0x29, + SDELAY_VALUE,0x14, + GPIO_DIR,0x01, + GPIO_OUT,RED_LED, +// FFCTRL_OUT_D,4, +// FFCTRH_OUT_D,12, + FFCTRL_OUT_B1,6, + FFCTRH_OUT_B1,20, + FFCTRL_OUT_B2,6, + FFCTRH_OUT_B2,20, + MPMSK,RXCI_INT+DEN_INT+DCOLL_INT, + 0 + }; + struct st5481_intr *intr = &adapter->intr; + int i = 0; + u8 request,value; + + DBG(8,""); + + adapter->leds = RED_LED; + + // Start receiving on the interrupt endpoint + SUBMIT_URB(intr->urb, GFP_KERNEL); + + while ((request = init_cmd_table[i++])) { + value = init_cmd_table[i++]; + st5481_usb_device_ctrl_msg(adapter, request, value, NULL, NULL); + } + st5481_ph_command(adapter, ST5481_CMD_PUP); +} + +/* + * Reset the adapter to default values. + */ +void st5481_stop(struct st5481_adapter *adapter) +{ + DBG(8,""); + + st5481_usb_device_ctrl_msg(adapter, SET_DEFAULT, 0, NULL, NULL); +} + +/* ====================================================================== + * isochronous USB helpers + */ + +static void +fill_isoc_urb(struct urb *urb, struct usb_device *dev, + unsigned int pipe, void *buf, int num_packets, + int packet_size, usb_complete_t complete, + void *context) +{ + int k; + + spin_lock_init(&urb->lock); + urb->dev=dev; + urb->pipe=pipe; + urb->transfer_buffer=buf; + urb->number_of_packets = num_packets; + urb->transfer_buffer_length=num_packets*packet_size; + urb->actual_length = 0; + urb->complete=complete; + urb->context=context; + urb->transfer_flags=URB_ISO_ASAP; + for (k = 0; k < num_packets; k++) { + urb->iso_frame_desc[k].offset = packet_size * k; + urb->iso_frame_desc[k].length = packet_size; + urb->iso_frame_desc[k].actual_length = 0; + } +} + +int +st5481_setup_isocpipes(struct urb* urb[2], struct usb_device *dev, + unsigned int pipe, int num_packets, + int packet_size, int buf_size, + usb_complete_t complete, void *context) +{ + int j, retval; + unsigned char *buf; + + for (j = 0; j < 2; j++) { + retval = -ENOMEM; + urb[j] = usb_alloc_urb(num_packets, GFP_KERNEL); + if (!urb[j]) + goto err; + + // Allocate memory for 2000bytes/sec (16Kb/s) + buf = kmalloc(buf_size, GFP_KERNEL); + if (!buf) + goto err; + + // Fill the isochronous URB + fill_isoc_urb(urb[j], dev, pipe, buf, + num_packets, packet_size, complete, + context); + } + return 0; + + err: + for (j = 0; j < 2; j++) { + if (urb[j]) { + if (urb[j]->transfer_buffer) + kfree(urb[j]->transfer_buffer); + usb_free_urb(urb[j]); + } + } + return retval; +} + +void st5481_release_isocpipes(struct urb* urb[2]) +{ + int j; + + for (j = 0; j < 2; j++) { + usb_unlink_urb(urb[j]); + if (urb[j]->transfer_buffer) + kfree(urb[j]->transfer_buffer); + usb_free_urb(urb[j]); + } +} + +/* + * Decode frames received on the B/D channel. + * Note that this function will be called continously + * with 64Kbit/s / 16Kbit/s of data and hence it will be + * called 50 times per second with 20 ISOC descriptors. + * Called at interrupt. + */ +static void usb_in_complete(struct urb *urb, struct pt_regs *regs) +{ + struct st5481_in *in = urb->context; + unsigned char *ptr; + struct sk_buff *skb; + int len, count, status; + + if (unlikely(urb->status < 0)) { + if (urb->status != -ENOENT && urb->status != -ESHUTDOWN) { + WARN("urb status %d",urb->status); + } else { + DBG(1,"urb killed"); + return; // Give up + } + } + + DBG_ISO_PACKET(0x80,urb); + + len = st5481_isoc_flatten(urb); + ptr = urb->transfer_buffer; + while (len > 0) { + if (in->mode == L1_MODE_TRANS) { + memcpy(in->rcvbuf, ptr, len); + status = len; + len = 0; + } else { + status = isdnhdlc_decode(&in->hdlc_state, ptr, len, &count, + in->rcvbuf, in->bufsize); + ptr += count; + len -= count; + } + + if (status > 0) { + // Good frame received + DBG(4,"count=%d",status); + DBG_PACKET(0x400, in->rcvbuf, status); + if (!(skb = dev_alloc_skb(status))) { + WARN("receive out of memory\n"); + break; + } + memcpy(skb_put(skb, status), in->rcvbuf, status); + in->hisax_if->l1l2(in->hisax_if, PH_DATA | INDICATION, skb); + } else if (status == -HDLC_CRC_ERROR) { + INFO("CRC error"); + } else if (status == -HDLC_FRAMING_ERROR) { + INFO("framing error"); + } else if (status == -HDLC_LENGTH_ERROR) { + INFO("length error"); + } + } + + // Prepare URB for next transfer + urb->dev = in->adapter->usb_dev; + urb->actual_length = 0; + + SUBMIT_URB(urb, GFP_ATOMIC); +} + +int st5481_setup_in(struct st5481_in *in) +{ + struct usb_device *dev = in->adapter->usb_dev; + int retval; + + DBG(4,""); + + in->rcvbuf = kmalloc(in->bufsize, GFP_KERNEL); + retval = -ENOMEM; + if (!in->rcvbuf) + goto err; + + retval = st5481_setup_isocpipes(in->urb, dev, + usb_rcvisocpipe(dev, in->ep), + in->num_packets, in->packet_size, + in->num_packets * in->packet_size, + usb_in_complete, in); + if (retval) + goto err_free; + return 0; + + err_free: + kfree(in->rcvbuf); + err: + return retval; +} + +void st5481_release_in(struct st5481_in *in) +{ + DBG(2,""); + + st5481_release_isocpipes(in->urb); +} + +/* + * Make the transfer_buffer contiguous by + * copying from the iso descriptors if necessary. + */ +int st5481_isoc_flatten(struct urb *urb) +{ + struct usb_iso_packet_descriptor *pipd,*pend; + unsigned char *src,*dst; + unsigned int len; + + if (urb->status < 0) { + return urb->status; + } + for (pipd = &urb->iso_frame_desc[0], + pend = &urb->iso_frame_desc[urb->number_of_packets], + dst = urb->transfer_buffer; + pipd < pend; + pipd++) { + + if (pipd->status < 0) { + return (pipd->status); + } + + len = pipd->actual_length; + pipd->actual_length = 0; + src = urb->transfer_buffer+pipd->offset; + + if (src != dst) { + // Need to copy since isoc buffers not full + while (len--) { + *dst++ = *src++; + } + } else { + // No need to copy, just update destination buffer + dst += len; + } + } + // Return size of flattened buffer + return (dst - (unsigned char *)urb->transfer_buffer); +} + +static void st5481_start_rcv(void *context) +{ + struct st5481_in *in = context; + struct st5481_adapter *adapter = in->adapter; + + DBG(4,""); + + in->urb[0]->dev = adapter->usb_dev; + SUBMIT_URB(in->urb[0], GFP_KERNEL); + + in->urb[1]->dev = adapter->usb_dev; + SUBMIT_URB(in->urb[1], GFP_KERNEL); +} + +void st5481_in_mode(struct st5481_in *in, int mode) +{ + if (in->mode == mode) + return; + + in->mode = mode; + + usb_unlink_urb(in->urb[0]); + usb_unlink_urb(in->urb[1]); + + if (in->mode != L1_MODE_NULL) { + if (in->mode != L1_MODE_TRANS) + isdnhdlc_rcv_init(&in->hdlc_state, + in->mode == L1_MODE_HDLC_56K); + + st5481_usb_pipe_reset(in->adapter, in->ep, NULL, NULL); + st5481_usb_device_ctrl_msg(in->adapter, in->counter, + in->packet_size, + NULL, NULL); + st5481_start_rcv(in); + } else { + st5481_usb_device_ctrl_msg(in->adapter, in->counter, + 0, NULL, NULL); + } +} + |