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 000000000000..2369180b1cb1
--- /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);
+        }
+}
+