// SPDX-License-Identifier: GPL-2.0+ /* * Garmin GPS driver * * Copyright (C) 2006-2011 Hermann Kneissel herkne@gmx.de * * The latest version of the driver can be found at * http://sourceforge.net/projects/garmin-gps/ * * This driver has been derived from v2.1 of the visor driver. */ #include #include #include #include #include #include #include #include #include #include #include #include #include /* the mode to be set when the port ist opened */ static int initial_mode = 1; #define GARMIN_VENDOR_ID 0x091E /* * Version Information */ #define VERSION_MAJOR 0 #define VERSION_MINOR 36 #define _STR(s) #s #define _DRIVER_VERSION(a, b) "v" _STR(a) "." _STR(b) #define DRIVER_VERSION _DRIVER_VERSION(VERSION_MAJOR, VERSION_MINOR) #define DRIVER_AUTHOR "hermann kneissel" #define DRIVER_DESC "garmin gps driver" /* error codes returned by the driver */ #define EINVPKT 1000 /* invalid packet structure */ /* size of the header of a packet using the usb protocol */ #define GARMIN_PKTHDR_LENGTH 12 /* max. possible size of a packet using the serial protocol */ #define MAX_SERIAL_PKT_SIZ (3 + 255 + 3) /* max. possible size of a packet with worst case stuffing */ #define MAX_SERIAL_PKT_SIZ_STUFFED (MAX_SERIAL_PKT_SIZ + 256) /* size of a buffer able to hold a complete (no stuffing) packet * (the document protocol does not contain packets with a larger * size, but in theory a packet may be 64k+12 bytes - if in * later protocol versions larger packet sizes occur, this value * should be increased accordingly, so the input buffer is always * large enough the store a complete packet inclusive header) */ #define GPS_IN_BUFSIZ (GARMIN_PKTHDR_LENGTH+MAX_SERIAL_PKT_SIZ) /* size of a buffer able to hold a complete (incl. stuffing) packet */ #define GPS_OUT_BUFSIZ (GARMIN_PKTHDR_LENGTH+MAX_SERIAL_PKT_SIZ_STUFFED) /* where to place the packet id of a serial packet, so we can * prepend the usb-packet header without the need to move the * packets data */ #define GSP_INITIAL_OFFSET (GARMIN_PKTHDR_LENGTH-2) /* max. size of incoming private packets (header+1 param) */ #define PRIVPKTSIZ (GARMIN_PKTHDR_LENGTH+4) #define GARMIN_LAYERID_TRANSPORT 0 #define GARMIN_LAYERID_APPL 20 /* our own layer-id to use for some control mechanisms */ #define GARMIN_LAYERID_PRIVATE 0x01106E4B #define GARMIN_PKTID_PVT_DATA 51 #define GARMIN_PKTID_L001_COMMAND_DATA 10 #define CMND_ABORT_TRANSFER 0 /* packet ids used in private layer */ #define PRIV_PKTID_SET_DEBUG 1 #define PRIV_PKTID_SET_MODE 2 #define PRIV_PKTID_INFO_REQ 3 #define PRIV_PKTID_INFO_RESP 4 #define PRIV_PKTID_RESET_REQ 5 #define PRIV_PKTID_SET_DEF_MODE 6 #define ETX 0x03 #define DLE 0x10 #define ACK 0x06 #define NAK 0x15 /* structure used to queue incoming packets */ struct garmin_packet { struct list_head list; int seq; /* the real size of the data array, always > 0 */ int size; __u8 data[] __counted_by(size); }; /* structure used to keep the current state of the driver */ struct garmin_data { __u8 state; __u16 flags; __u8 mode; __u8 count; __u8 pkt_id; __u32 serial_num; struct timer_list timer; struct usb_serial_port *port; int seq_counter; int insize; int outsize; __u8 inbuffer [GPS_IN_BUFSIZ]; /* tty -> usb */ __u8 outbuffer[GPS_OUT_BUFSIZ]; /* usb -> tty */ __u8 privpkt[4*6]; spinlock_t lock; struct list_head pktlist; struct usb_anchor write_urbs; }; #define STATE_NEW 0 #define STATE_INITIAL_DELAY 1 #define STATE_TIMEOUT 2 #define STATE_SESSION_REQ1 3 #define STATE_SESSION_REQ2 4 #define STATE_ACTIVE 5 #define STATE_RESET 8 #define STATE_DISCONNECTED 9 #define STATE_WAIT_TTY_ACK 10 #define STATE_GSP_WAIT_DATA 11 #define MODE_NATIVE 0 #define MODE_GARMIN_SERIAL 1 /* Flags used in garmin_data.flags: */ #define FLAGS_SESSION_REPLY_MASK 0x00C0 #define FLAGS_SESSION_REPLY1_SEEN 0x0080 #define FLAGS_SESSION_REPLY2_SEEN 0x0040 #define FLAGS_BULK_IN_ACTIVE 0x0020 #define FLAGS_BULK_IN_RESTART 0x0010 #define FLAGS_THROTTLED 0x0008 #define APP_REQ_SEEN 0x0004 #define APP_RESP_SEEN 0x0002 #define CLEAR_HALT_REQUIRED 0x0001 #define FLAGS_QUEUING 0x0100 #define FLAGS_DROP_DATA 0x0800 #define FLAGS_GSP_SKIP 0x1000 #define FLAGS_GSP_DLESEEN 0x2000 /* function prototypes */ static int gsp_next_packet(struct garmin_data *garmin_data_p); static int garmin_write_bulk(struct usb_serial_port *port, const unsigned char *buf, int count, int dismiss_ack); /* some special packets to be send or received */ static unsigned char const GARMIN_START_SESSION_REQ[] = { 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0 }; static unsigned char const GARMIN_START_SESSION_REPLY[] = { 0, 0, 0, 0, 6, 0, 0, 0, 4, 0, 0, 0 }; static unsigned char const GARMIN_BULK_IN_AVAIL_REPLY[] = { 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 }; static unsigned char const GARMIN_STOP_TRANSFER_REQ[] = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 0, 0 }; static unsigned char const GARMIN_STOP_TRANSFER_REQ_V2[] = { 20, 0, 0, 0, 10, 0, 0, 0, 1, 0, 0, 0, 0 }; /* packets currently unused, left as documentation */ #if 0 static unsigned char const GARMIN_APP_LAYER_REPLY[] = { 0x14, 0, 0, 0 }; static unsigned char const GARMIN_START_PVT_REQ[] = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 49, 0 }; static unsigned char const GARMIN_STOP_PVT_REQ[] = { 20, 0, 0, 0, 10, 0, 0, 0, 2, 0, 0, 0, 50, 0 }; static unsigned char const PRIVATE_REQ[] = { 0x4B, 0x6E, 0x10, 0x01, 0xFF, 0, 0, 0, 0xFF, 0, 0, 0 }; #endif static const struct usb_device_id id_table[] = { /* the same device id seems to be used by all usb enabled GPS devices */ { USB_DEVICE(GARMIN_VENDOR_ID, 3) }, { } /* Terminating entry */ }; MODULE_DEVICE_TABLE(usb, id_table); static inline int getLayerId(const __u8 *usbPacket) { return __le32_to_cpup((__le32 *)(usbPacket)); } static inline int getPacketId(const __u8 *usbPacket) { return __le32_to_cpup((__le32 *)(usbPacket+4)); } static inline int getDataLength(const __u8 *usbPacket) { return __le32_to_cpup((__le32 *)(usbPacket+8)); } /* * check if the usb-packet in buf contains an abort-transfer command. * (if yes, all queued data will be dropped) */ static inline int isAbortTrfCmnd(const unsigned char *buf) { if (memcmp(buf, GARMIN_STOP_TRANSFER_REQ, sizeof(GARMIN_STOP_TRANSFER_REQ)) == 0 || memcmp(buf, GARMIN_STOP_TRANSFER_REQ_V2, sizeof(GARMIN_STOP_TRANSFER_REQ_V2)) == 0) return 1; else return 0; } static void send_to_tty(struct usb_serial_port *port, char *data, unsigned int actual_length) { if (actual_length) { usb_serial_debug_data(&port->dev, __func__, actual_length, data); tty_insert_flip_string(&port->port, data, actual_length); tty_flip_buffer_push(&port->port); } } /****************************************************************************** * packet queue handling ******************************************************************************/ /* * queue a received (usb-)packet for later processing */ static int pkt_add(struct garmin_data *garmin_data_p, unsigned char *data, unsigned int data_length) { int state = 0; int result = 0; unsigned long flags; struct garmin_packet *pkt; /* process only packets containing data ... */ if (data_length) { pkt = kmalloc(struct_size(pkt, data, data_length), GFP_ATOMIC); if (!pkt) return 0; pkt->size = data_length; memcpy(pkt->data, data, data_length); spin_lock_irqsave(&garmin_data_p->lock, flags); garmin_data_p->flags |= FLAGS_QUEUING; result = list_empty(&garmin_data_p->pktlist); pkt->seq = garmin_data_p->seq_counter++; list_add_tail(&pkt->list, &garmin_data_p->pktlist); state = garmin_data_p->state; spin_unlock_irqrestore(&garmin_data_p->lock, flags); dev_dbg(&garmin_data_p->port->dev, "%s - added: pkt: %d - %d bytes\n", __func__, pkt->seq, data_length); /* in serial mode, if someone is waiting for data from the device, convert and send the next packet to tty. */ if (result && (state == STATE_GSP_WAIT_DATA)) gsp_next_packet(garmin_data_p); } return result; } /* get the next pending packet */ static struct garmin_packet *pkt_pop(struct garmin_data *garmin_data_p) { unsigned long flags; struct garmin_packet *result = NULL; spin_lock_irqsave(&garmin_data_p->lock, flags); if (!list_empty(&garmin_data_p->pktlist)) { result = (struct garmin_packet *)garmin_data_p->pktlist.next; list_del(&result->list); } spin_unlock_irqrestore(&garmin_data_p->lock, flags); return result; } /* free up all queued data */ static void pkt_clear(struct garmin_data *garmin_data_p) { unsigned long flags; struct garmin_packet *result = NULL; spin_lock_irqsave(&garmin_data_p->lock, flags); while (!list_empty(&garmin_data_p->pktlist)) { result = (struct garmin_packet *)garmin_data_p->pktlist.next; list_del(&result->list); kfree(result); } spin_unlock_irqrestore(&garmin_data_p->lock, flags); } /****************************************************************************** * garmin serial protocol handling handling ******************************************************************************/ /* send an ack packet back to the tty */ static int gsp_send_ack(struct garmin_data *garmin_data_p, __u8 pkt_id) { __u8 pkt[10]; __u8 cksum = 0; __u8 *ptr = pkt; unsigned l = 0; dev_dbg(&garmin_data_p->port->dev, "%s - pkt-id: 0x%X.\n", __func__, pkt_id); *ptr++ = DLE; *ptr++ = ACK; cksum += ACK; *ptr++ = 2; cksum += 2; *ptr++ = pkt_id; cksum += pkt_id; if (pkt_id == DLE) *ptr++ = DLE; *ptr++ = 0; *ptr++ = (-cksum) & 0xFF; *ptr++ = DLE; *ptr++ = ETX; l = ptr-pkt; send_to_tty(garmin_data_p->port, pkt, l); return 0; } /* * called for a complete packet received from tty layer * * the complete packet (pktid ... cksum) is in garmin_data_p->inbuf starting * at GSP_INITIAL_OFFSET. * * count - number of bytes in the input buffer including space reserved for * the usb header: GSP_INITIAL_OFFSET + number of bytes in packet * (including pkt-id, data-length a. cksum) */ static int gsp_rec_packet(struct garmin_data *garmin_data_p, int count) { struct device *dev = &garmin_data_p->port->dev; unsigned long flags; const __u8 *recpkt = garmin_data_p->inbuffer+GSP_INITIAL_OFFSET; __le32 *usbdata = (__le32 *) garmin_data_p->inbuffer; int cksum = 0; int n = 0; int pktid = recpkt[0]; int size = recpkt[1]; usb_serial_debug_data(&garmin_data_p->port->dev, __func__, count-GSP_INITIAL_OFFSET, recpkt); if (size != (count-GSP_INITIAL_OFFSET-3)) { dev_dbg(dev, "%s - invalid size, expected %d bytes, got %d\n", __func__, size, (count-GSP_INITIAL_OFFSET-3)); return -EINVPKT; } cksum += *recpkt++; cksum += *recpkt++; /* sanity check, remove after test ... */ if ((__u8 *)&(usbdata[3]) != recpkt) { dev_dbg(dev, "%s - ptr mismatch %p - %p\n", __func__, &(usbdata[4]), recpkt); return -EINVPKT; } while (n < size) { cksum += *recpkt++; n++; } if (((cksum + *recpkt) & 0xff) != 0) { dev_dbg(dev, "%s - invalid checksum, expected %02x, got %02x\n", __func__, -cksum & 0xff, *recpkt); return -EINVPKT; } usbdata[0] = __cpu_to_le32(GARMIN_LAYERID_APPL); usbdata[1] = __cpu_to_le32(pktid); usbdata[2] = __cpu_to_le32(size); garmin_write_bulk(garmin_data_p->port, garmin_data_p->inbuffer, GARMIN_PKTHDR_LENGTH+size, 0); /* if this was an abort-transfer command, flush all queued data. */ if (isAbortTrfCmnd(garmin_data_p->inbuffer)) { spin_lock_irqsave(&garmin_data_p->lock, flags); garmin_data_p->flags |= FLAGS_DROP_DATA; spin_unlock_irqrestore(&garmin_data_p->lock, flags); pkt_clear(garmin_data_p); } return count; } /* * Called for data received from tty * * buf contains the data read, it may span more than one packet or even * incomplete packets * * input record should be a serial-record, but it may not be complete. * Copy it into our local buffer, until an etx is seen (or an error * occurs). * Once the record is complete, convert into a usb packet and send it * to the bulk pipe, send an ack back to the tty. * * If the input is an ack, just send the last queued packet to the * tty layer. * * if the input is an abort command, drop all queued data. */ static int gsp_receive(struct garmin_data *garmin_data_p, const unsigned char *buf, int count) { struct device *dev = &garmin_data_p->port->dev; unsigned long flags; int offs = 0; int ack_or_nak_seen = 0; __u8 *dest; int size; /* dleSeen: set if last byte read was a DLE */ int dleSeen; /* skip: if set, skip incoming data until possible start of * new packet */ int skip; __u8 data; spin_lock_irqsave(&garmin_data_p->lock, flags); dest = garmin_data_p->inbuffer; size = garmin_data_p->insize; dleSeen = garmin_data_p->flags & FLAGS_GSP_DLESEEN; skip = garmin_data_p->flags & FLAGS_GSP_SKIP; spin_unlock_irqrestore(&garmin_data_p->lock, flags); /* dev_dbg(dev, "%s - dle=%d skip=%d size=%d count=%d\n", __func__, dleSeen, skip, size, count); */ if (size == 0) size = GSP_INITIAL_OFFSET; while (offs < count) { data = *(buf+offs); offs++; if (data == DLE) { if (skip) { /* start of a new pkt */ skip = 0; size = GSP_INITIAL_OFFSET; dleSeen = 1; } else if (dleSeen) { dest[size++] = data; dleSeen = 0; } else { dleSeen = 1; } } else if (data == ETX) { if (dleSeen) { /* packet complete */ data = dest[GSP_INITIAL_OFFSET]; if (data == ACK) { ack_or_nak_seen = ACK; dev_dbg(dev, "ACK packet complete.\n"); } else if (data == NAK) { ack_or_nak_seen = NAK; dev_dbg(dev, "NAK packet complete.\n"); } else { dev_dbg(dev, "packet complete - id=0x%X.\n", data); gsp_rec_packet(garmin_data_p, size); } skip = 1; size = GSP_INITIAL_OFFSET; dleSeen = 0; } else { dest[size++] = data; } } else if (!skip) { if (dleSeen) { size = GSP_INITIAL_OFFSET; dleSeen = 0; } dest[size++] = data; } if (size >= GPS_IN_BUFSIZ) { dev_dbg(dev, "%s - packet too large.\n", __func__); skip = 1; size = GSP_INITIAL_OFFSET; dleSeen = 0; } } spin_lock_irqsave(&garmin_data_p->lock, flags); garmin_data_p->insize = size; /* copy flags back to structure */ if (skip) garmin_data_p->flags |= FLAGS_GSP_SKIP; else garmin_data_p->flags &= ~FLAGS_GSP_SKIP; if (dleSeen) garmin_data_p->flags |= FLAGS_GSP_DLESEEN; else garmin_data_p->flags &= ~FLAGS_GSP_DLESEEN; spin_unlock_irqrestore(&garmin_data_p->lock, flags); if (ack_or_nak_seen) { if (gsp_next_packet(garmin_data_p) > 0) garmin_data_p->state = STATE_ACTIVE; else garmin_data_p->state = STATE_GSP_WAIT_DATA; } return count; } /* * Sends a usb packet to the tty * * Assumes, that all packages and at an usb-packet boundary. * * return <0 on error, 0 if packet is incomplete or > 0 if packet was sent */ static int gsp_send(struct garmin_data *garmin_data_p, const unsigned char *buf, int count) { struct device *dev = &garmin_data_p->port->dev; const unsigned char *src; unsigned char *dst; int pktid = 0; int datalen = 0; int cksum = 0; int i = 0; int k; dev_dbg(dev, "%s - state %d - %d bytes.\n", __func__, garmin_data_p->state, count); k = garmin_data_p->outsize; if ((k+count) > GPS_OUT_BUFSIZ) { dev_dbg(dev, "packet too large\n"); garmin_data_p->outsize = 0; return -4; } memcpy(garmin_data_p->outbuffer+k, buf, count); k += count; garmin_data_p->outsize = k; if (k >= GARMIN_PKTHDR_LENGTH) { pktid = getPacketId(garmin_data_p->outbuffer); datalen = getDataLength(garmin_data_p->outbuffer); i = GARMIN_PKTHDR_LENGTH + datalen; if (k < i) return 0; } else { return 0; } dev_dbg(dev, "%s - %d bytes in buffer, %d bytes in pkt.\n", __func__, k, i); /* garmin_data_p->outbuffer now contains a complete packet */ usb_serial_debug_data(&garmin_data_p->port->dev, __func__, k, garmin_data_p->outbuffer); garmin_data_p->outsize = 0; if (getLayerId(garmin_data_p->outbuffer) != GARMIN_LAYERID_APPL) { dev_dbg(dev, "not an application packet (%d)\n", getLayerId(garmin_data_p->outbuffer)); return -1; } if (pktid > 255) { dev_dbg(dev, "packet-id %d too large\n", pktid); return -2; } if (datalen > 255) { dev_dbg(dev, "packet-size %d too large\n", datalen); return -3; } /* the serial protocol should be able to handle this packet */ k = 0; src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH; for (i = 0; i < datalen; i++) { if (*src++ == DLE) k++; } src = garmin_data_p->outbuffer+GARMIN_PKTHDR_LENGTH; if (k > (GARMIN_PKTHDR_LENGTH-2)) { /* can't add stuffing DLEs in place, move data to end of buffer ... */ dst = garmin_data_p->outbuffer+GPS_OUT_BUFSIZ-datalen; memcpy(dst, src, datalen); src = dst; } dst = garmin_data_p->outbuffer; *dst++ = DLE; *dst++ = pktid; cksum += pktid; *dst++ = datalen; cksum += datalen; if (datalen == DLE) *dst++ = DLE; for (i = 0; i < datalen; i++) { __u8 c = *src++; *dst++ = c; cksum += c; if (c == DLE) *dst++ = DLE; } cksum = -cksum & 0xFF; *dst++ = cksum; if (cksum == DLE) *dst++ = DLE; *dst++ = DLE; *dst++ = ETX; i = dst-garmin_data_p->outbuffer; send_to_tty(garmin_data_p->port, garmin_data_p->outbuffer, i); garmin_data_p->pkt_id = pktid; garmin_data_p->state = STATE_WAIT_TTY_ACK; return i; } /* * Process the next pending data packet - if there is one */ static int gsp_next_packet(struct garmin_data *garmin_data_p) { int result = 0; struct garmin_packet *pkt = NULL; while ((pkt = pkt_pop(garmin_data_p)) != NULL) { dev_dbg(&garmin_data_p->port->dev, "%s - next pkt: %d\n", __func__, pkt->seq); result = gsp_send(garmin_data_p, pkt->data, pkt->size); if (result > 0) { kfree(pkt); return result; } kfree(pkt); } return result; } /****************************************************************************** * garmin native mode ******************************************************************************/ /* * Called for data received from tty * * The input data is expected to be in garmin usb-packet format. * * buf contains the data read, it may span more than one packet * or even incomplete packets */ static int nat_receive(struct garmin_data *garmin_data_p, const unsigned char *buf, int count) { unsigned long flags; __u8 *dest; int offs = 0; int result = count; int len; while (offs < count) { /* if buffer contains header, copy rest of data */ if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH) len = GARMIN_PKTHDR_LENGTH +getDataLength(garmin_data_p->inbuffer); else len = GARMIN_PKTHDR_LENGTH; if (len >= GPS_IN_BUFSIZ) { /* seems to be an invalid packet, ignore rest of input */ dev_dbg(&garmin_data_p->port->dev, "%s - packet size too large: %d\n", __func__, len); garmin_data_p->insize = 0; count = 0; result = -EINVPKT; } else { len -= garmin_data_p->insize; if (len > (count-offs)) len = (count-offs); if (len > 0) { dest = garmin_data_p->inbuffer + garmin_data_p->insize; memcpy(dest, buf+offs, len); garmin_data_p->insize += len; offs += len; } } /* do we have a complete packet ? */ if (garmin_data_p->insize >= GARMIN_PKTHDR_LENGTH) { len = GARMIN_PKTHDR_LENGTH+ getDataLength(garmin_data_p->inbuffer); if (garmin_data_p->insize >= len) { garmin_write_bulk(garmin_data_p->port, garmin_data_p->inbuffer, len, 0); garmin_data_p->insize = 0; /* if this was an abort-transfer command, flush all queued data. */ if (isAbortTrfCmnd(garmin_data_p->inbuffer)) { spin_lock_irqsave(&garmin_data_p->lock, flags); garmin_data_p->flags |= FLAGS_DROP_DATA; spin_unlock_irqrestore( &garmin_data_p->lock, flags); pkt_clear(garmin_data_p); } } } } return result; } /****************************************************************************** * private packets ******************************************************************************/ static void priv_status_resp(struct usb_serial_port *port) { struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); __le32 *pkt = (__le32 *)garmin_data_p->privpkt; pkt[0] = __cpu_to_le32(GARMIN_LAYERID_PRIVATE); pkt[1] = __cpu_to_le32(PRIV_PKTID_INFO_RESP); pkt[2] = __cpu_to_le32(12); pkt[3] = __cpu_to_le32(VERSION_MAJOR << 16 | VERSION_MINOR); pkt[4] = __cpu_to_le32(garmin_data_p->mode); pkt[5] = __cpu_to_le32(garmin_data_p->serial_num); send_to_tty(port, (__u8 *)pkt, 6 * 4); } /****************************************************************************** * Garmin specific driver functions ******************************************************************************/ static int process_resetdev_request(struct usb_serial_port *port) { unsigned long flags; int status; struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); spin_lock_irqsave(&garmin_data_p->lock, flags); garmin_data_p->flags &= ~(CLEAR_HALT_REQUIRED); garmin_data_p->state = STATE_RESET; garmin_data_p->serial_num = 0; spin_unlock_irqrestore(&garmin_data_p->lock, flags); usb_kill_urb(port->interrupt_in_urb); dev_dbg(&port->dev, "%s - usb_reset_device\n", __func__); status = usb_reset_device(port->serial->dev); if (status) dev_dbg(&port->dev, "%s - usb_reset_device failed: %d\n", __func__, status); return status; } /* * clear all cached data */ static int garmin_clear(struct garmin_data *garmin_data_p) { unsigned long flags; /* flush all queued data */ pkt_clear(garmin_data_p); spin_lock_irqsave(&garmin_data_p->lock, flags); garmin_data_p->insize = 0; garmin_data_p->outsize = 0; spin_unlock_irqrestore(&garmin_data_p->lock, flags); return 0; } static int garmin_init_session(struct usb_serial_port *port) { struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); int status; int i; usb_kill_urb(port->interrupt_in_urb); status = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); if (status) { dev_err(&port->dev, "failed to submit interrupt urb: %d\n", status); return status; } /* * using the initialization method from gpsbabel. See comments in * gpsbabel/jeeps/gpslibusb.c gusb_reset_toggles() */ dev_dbg(&port->dev, "%s - starting session ...\n", __func__); garmin_data_p->state = STATE_ACTIVE; for (i = 0; i < 3; i++) { status = garmin_write_bulk(port, GARMIN_START_SESSION_REQ, sizeof(GARMIN_START_SESSION_REQ), 0); if (status < 0) goto err_kill_urbs; } return 0; err_kill_urbs: usb_kill_anchored_urbs(&garmin_data_p->write_urbs); usb_kill_urb(port->interrupt_in_urb); return status; } static int garmin_open(struct tty_struct *tty, struct usb_serial_port *port) { unsigned long flags; int status = 0; struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); spin_lock_irqsave(&garmin_data_p->lock, flags); garmin_data_p->mode = initial_mode; garmin_data_p->count = 0; garmin_data_p->flags &= FLAGS_SESSION_REPLY1_SEEN; spin_unlock_irqrestore(&garmin_data_p->lock, flags); /* shutdown any bulk reads that might be going on */ usb_kill_urb(port->read_urb); if (garmin_data_p->state == STATE_RESET) status = garmin_init_session(port); garmin_data_p->state = STATE_ACTIVE; return status; } static void garmin_close(struct usb_serial_port *port) { struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); dev_dbg(&port->dev, "%s - mode=%d state=%d flags=0x%X\n", __func__, garmin_data_p->mode, garmin_data_p->state, garmin_data_p->flags); garmin_clear(garmin_data_p); /* shutdown our urbs */ usb_kill_urb(port->read_urb); usb_kill_anchored_urbs(&garmin_data_p->write_urbs); /* keep reset state so we know that we must start a new session */ if (garmin_data_p->state != STATE_RESET) garmin_data_p->state = STATE_DISCONNECTED; } static void garmin_write_bulk_callback(struct urb *urb) { struct usb_serial_port *port = urb->context; if (port) { struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); if (getLayerId(urb->transfer_buffer) == GARMIN_LAYERID_APPL) { if (garmin_data_p->mode == MODE_GARMIN_SERIAL) { gsp_send_ack(garmin_data_p, ((__u8 *)urb->transfer_buffer)[4]); } } usb_serial_port_softint(port); } /* Ignore errors that resulted from garmin_write_bulk with dismiss_ack = 1 */ /* free up the transfer buffer, as usb_free_urb() does not do this */ kfree(urb->transfer_buffer); } static int garmin_write_bulk(struct usb_serial_port *port, const unsigned char *buf, int count, int dismiss_ack) { unsigned long flags; struct usb_serial *serial = port->serial; struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); struct urb *urb; unsigned char *buffer; int status; spin_lock_irqsave(&garmin_data_p->lock, flags); garmin_data_p->flags &= ~FLAGS_DROP_DATA; spin_unlock_irqrestore(&garmin_data_p->lock, flags); buffer = kmemdup(buf, count, GFP_ATOMIC); if (!buffer) return -ENOMEM; urb = usb_alloc_urb(0, GFP_ATOMIC); if (!urb) { kfree(buffer); return -ENOMEM; } usb_serial_debug_data(&port->dev, __func__, count, buffer); usb_fill_bulk_urb(urb, serial->dev, usb_sndbulkpipe(serial->dev, port->bulk_out_endpointAddress), buffer, count, garmin_write_bulk_callback, dismiss_ack ? NULL : port); urb->transfer_flags |= URB_ZERO_PACKET; if (getLayerId(buffer) == GARMIN_LAYERID_APPL) { spin_lock_irqsave(&garmin_data_p->lock, flags); garmin_data_p->flags |= APP_REQ_SEEN; spin_unlock_irqrestore(&garmin_data_p->lock, flags); if (garmin_data_p->mode == MODE_GARMIN_SERIAL) { pkt_clear(garmin_data_p); garmin_data_p->state = STATE_GSP_WAIT_DATA; } } /* send it down the pipe */ usb_anchor_urb(urb, &garmin_data_p->write_urbs); status = usb_submit_urb(urb, GFP_ATOMIC); if (status) { dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed with status = %d\n", __func__, status); count = status; usb_unanchor_urb(urb); kfree(buffer); } /* we are done with this urb, so let the host driver * really free it when it is finished with it */ usb_free_urb(urb); return count; } static int garmin_write(struct tty_struct *tty, struct usb_serial_port *port, const unsigned char *buf, int count) { struct device *dev = &port->dev; int pktid, pktsiz, len; struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); __le32 *privpkt = (__le32 *)garmin_data_p->privpkt; usb_serial_debug_data(dev, __func__, count, buf); if (garmin_data_p->state == STATE_RESET) return -EIO; /* check for our private packets */ if (count >= GARMIN_PKTHDR_LENGTH) { len = PRIVPKTSIZ; if (count < len) len = count; memcpy(garmin_data_p->privpkt, buf, len); pktsiz = getDataLength(garmin_data_p->privpkt); pktid = getPacketId(garmin_data_p->privpkt); if (count == (GARMIN_PKTHDR_LENGTH + pktsiz) && getLayerId(garmin_data_p->privpkt) == GARMIN_LAYERID_PRIVATE) { dev_dbg(dev, "%s - processing private request %d\n", __func__, pktid); /* drop all unfinished transfers */ garmin_clear(garmin_data_p); switch (pktid) { case PRIV_PKTID_SET_MODE: if (pktsiz != 4) return -EINVPKT; garmin_data_p->mode = __le32_to_cpu(privpkt[3]); dev_dbg(dev, "%s - mode set to %d\n", __func__, garmin_data_p->mode); break; case PRIV_PKTID_INFO_REQ: priv_status_resp(port); break; case PRIV_PKTID_RESET_REQ: process_resetdev_request(port); break; case PRIV_PKTID_SET_DEF_MODE: if (pktsiz != 4) return -EINVPKT; initial_mode = __le32_to_cpu(privpkt[3]); dev_dbg(dev, "%s - initial_mode set to %d\n", __func__, garmin_data_p->mode); break; } return count; } } if (garmin_data_p->mode == MODE_GARMIN_SERIAL) { return gsp_receive(garmin_data_p, buf, count); } else { /* MODE_NATIVE */ return nat_receive(garmin_data_p, buf, count); } } static unsigned int garmin_write_room(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; /* * Report back the bytes currently available in the output buffer. */ struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); return GPS_OUT_BUFSIZ-garmin_data_p->outsize; } static void garmin_read_process(struct garmin_data *garmin_data_p, unsigned char *data, unsigned data_length, int bulk_data) { unsigned long flags; if (garmin_data_p->flags & FLAGS_DROP_DATA) { /* abort-transfer cmd is active */ dev_dbg(&garmin_data_p->port->dev, "%s - pkt dropped\n", __func__); } else if (garmin_data_p->state != STATE_DISCONNECTED && garmin_data_p->state != STATE_RESET) { /* if throttling is active or postprecessing is required put the received data in the input queue, otherwise send it directly to the tty port */ if (garmin_data_p->flags & FLAGS_QUEUING) { pkt_add(garmin_data_p, data, data_length); } else if (bulk_data || (data_length >= sizeof(u32) && getLayerId(data) == GARMIN_LAYERID_APPL)) { spin_lock_irqsave(&garmin_data_p->lock, flags); garmin_data_p->flags |= APP_RESP_SEEN; spin_unlock_irqrestore(&garmin_data_p->lock, flags); if (garmin_data_p->mode == MODE_GARMIN_SERIAL) { pkt_add(garmin_data_p, data, data_length); } else { send_to_tty(garmin_data_p->port, data, data_length); } } /* ignore system layer packets ... */ } } static void garmin_read_bulk_callback(struct urb *urb) { unsigned long flags; struct usb_serial_port *port = urb->context; struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); unsigned char *data = urb->transfer_buffer; int status = urb->status; int retval; if (status) { dev_dbg(&urb->dev->dev, "%s - nonzero read bulk status received: %d\n", __func__, status); return; } usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); garmin_read_process(garmin_data_p, data, urb->actual_length, 1); if (urb->actual_length == 0 && (garmin_data_p->flags & FLAGS_BULK_IN_RESTART) != 0) { spin_lock_irqsave(&garmin_data_p->lock, flags); garmin_data_p->flags &= ~FLAGS_BULK_IN_RESTART; spin_unlock_irqrestore(&garmin_data_p->lock, flags); retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); if (retval) dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __func__, retval); } else if (urb->actual_length > 0) { /* Continue trying to read until nothing more is received */ if ((garmin_data_p->flags & FLAGS_THROTTLED) == 0) { retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); if (retval) dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __func__, retval); } } else { dev_dbg(&port->dev, "%s - end of bulk data\n", __func__); spin_lock_irqsave(&garmin_data_p->lock, flags); garmin_data_p->flags &= ~FLAGS_BULK_IN_ACTIVE; spin_unlock_irqrestore(&garmin_data_p->lock, flags); } } static void garmin_read_int_callback(struct urb *urb) { unsigned long flags; int retval; struct usb_serial_port *port = urb->context; struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); unsigned char *data = urb->transfer_buffer; int status = urb->status; switch (status) { case 0: /* success */ break; case -ECONNRESET: case -ENOENT: case -ESHUTDOWN: /* this urb is terminated, clean up */ dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n", __func__, status); return; default: dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status); return; } usb_serial_debug_data(&port->dev, __func__, urb->actual_length, urb->transfer_buffer); if (urb->actual_length == sizeof(GARMIN_BULK_IN_AVAIL_REPLY) && memcmp(data, GARMIN_BULK_IN_AVAIL_REPLY, sizeof(GARMIN_BULK_IN_AVAIL_REPLY)) == 0) { dev_dbg(&port->dev, "%s - bulk data available.\n", __func__); if ((garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE) == 0) { /* bulk data available */ retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); if (retval) { dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __func__, retval); } else { spin_lock_irqsave(&garmin_data_p->lock, flags); garmin_data_p->flags |= FLAGS_BULK_IN_ACTIVE; spin_unlock_irqrestore(&garmin_data_p->lock, flags); } } else { /* bulk-in transfer still active */ spin_lock_irqsave(&garmin_data_p->lock, flags); garmin_data_p->flags |= FLAGS_BULK_IN_RESTART; spin_unlock_irqrestore(&garmin_data_p->lock, flags); } } else if (urb->actual_length == (4+sizeof(GARMIN_START_SESSION_REPLY)) && memcmp(data, GARMIN_START_SESSION_REPLY, sizeof(GARMIN_START_SESSION_REPLY)) == 0) { spin_lock_irqsave(&garmin_data_p->lock, flags); garmin_data_p->flags |= FLAGS_SESSION_REPLY1_SEEN; spin_unlock_irqrestore(&garmin_data_p->lock, flags); /* save the serial number */ garmin_data_p->serial_num = __le32_to_cpup( (__le32 *)(data+GARMIN_PKTHDR_LENGTH)); dev_dbg(&port->dev, "%s - start-of-session reply seen - serial %u.\n", __func__, garmin_data_p->serial_num); } garmin_read_process(garmin_data_p, data, urb->actual_length, 0); retval = usb_submit_urb(urb, GFP_ATOMIC); if (retval) dev_err(&urb->dev->dev, "%s - Error %d submitting interrupt urb\n", __func__, retval); } /* * Sends the next queued packt to the tty port (garmin native mode only) * and then sets a timer to call itself again until all queued data * is sent. */ static int garmin_flush_queue(struct garmin_data *garmin_data_p) { unsigned long flags; struct garmin_packet *pkt; if ((garmin_data_p->flags & FLAGS_THROTTLED) == 0) { pkt = pkt_pop(garmin_data_p); if (pkt != NULL) { send_to_tty(garmin_data_p->port, pkt->data, pkt->size); kfree(pkt); mod_timer(&garmin_data_p->timer, (1)+jiffies); } else { spin_lock_irqsave(&garmin_data_p->lock, flags); garmin_data_p->flags &= ~FLAGS_QUEUING; spin_unlock_irqrestore(&garmin_data_p->lock, flags); } } return 0; } static void garmin_throttle(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); /* set flag, data received will be put into a queue for later processing */ spin_lock_irq(&garmin_data_p->lock); garmin_data_p->flags |= FLAGS_QUEUING|FLAGS_THROTTLED; spin_unlock_irq(&garmin_data_p->lock); } static void garmin_unthrottle(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); int status; spin_lock_irq(&garmin_data_p->lock); garmin_data_p->flags &= ~FLAGS_THROTTLED; spin_unlock_irq(&garmin_data_p->lock); /* in native mode send queued data to tty, in serial mode nothing needs to be done here */ if (garmin_data_p->mode == MODE_NATIVE) garmin_flush_queue(garmin_data_p); if ((garmin_data_p->flags & FLAGS_BULK_IN_ACTIVE) != 0) { status = usb_submit_urb(port->read_urb, GFP_KERNEL); if (status) dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __func__, status); } } /* * The timer is currently only used to send queued packets to * the tty in cases where the protocol provides no own handshaking * to initiate the transfer. */ static void timeout_handler(struct timer_list *t) { struct garmin_data *garmin_data_p = from_timer(garmin_data_p, t, timer); /* send the next queued packet to the tty port */ if (garmin_data_p->mode == MODE_NATIVE) if (garmin_data_p->flags & FLAGS_QUEUING) garmin_flush_queue(garmin_data_p); } static int garmin_port_probe(struct usb_serial_port *port) { int status; struct garmin_data *garmin_data_p; garmin_data_p = kzalloc(sizeof(struct garmin_data), GFP_KERNEL); if (!garmin_data_p) return -ENOMEM; timer_setup(&garmin_data_p->timer, timeout_handler, 0); spin_lock_init(&garmin_data_p->lock); INIT_LIST_HEAD(&garmin_data_p->pktlist); garmin_data_p->port = port; garmin_data_p->state = 0; garmin_data_p->flags = 0; garmin_data_p->count = 0; init_usb_anchor(&garmin_data_p->write_urbs); usb_set_serial_port_data(port, garmin_data_p); status = garmin_init_session(port); if (status) goto err_free; return 0; err_free: kfree(garmin_data_p); return status; } static void garmin_port_remove(struct usb_serial_port *port) { struct garmin_data *garmin_data_p = usb_get_serial_port_data(port); usb_kill_anchored_urbs(&garmin_data_p->write_urbs); usb_kill_urb(port->interrupt_in_urb); timer_shutdown_sync(&garmin_data_p->timer); kfree(garmin_data_p); } /* All of the device info needed */ static struct usb_serial_driver garmin_device = { .driver = { .name = "garmin_gps", }, .description = "Garmin GPS usb/tty", .id_table = id_table, .num_ports = 1, .open = garmin_open, .close = garmin_close, .throttle = garmin_throttle, .unthrottle = garmin_unthrottle, .port_probe = garmin_port_probe, .port_remove = garmin_port_remove, .write = garmin_write, .write_room = garmin_write_room, .write_bulk_callback = garmin_write_bulk_callback, .read_bulk_callback = garmin_read_bulk_callback, .read_int_callback = garmin_read_int_callback, }; static struct usb_serial_driver * const serial_drivers[] = { &garmin_device, NULL }; module_usb_serial_driver(serial_drivers, id_table); MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); module_param(initial_mode, int, 0444); MODULE_PARM_DESC(initial_mode, "Initial mode");