diff options
Diffstat (limited to 'drivers/usb/serial/garmin_gps.c')
| -rw-r--r-- | drivers/usb/serial/garmin_gps.c | 1449 |
1 files changed, 1449 insertions, 0 deletions
diff --git a/drivers/usb/serial/garmin_gps.c b/drivers/usb/serial/garmin_gps.c new file mode 100644 index 000000000..c02c19bb1 --- /dev/null +++ b/drivers/usb/serial/garmin_gps.c @@ -0,0 +1,1449 @@ +// 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 <linux/kernel.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/timer.h> +#include <linux/tty.h> +#include <linux/tty_driver.h> +#include <linux/tty_flip.h> +#include <linux/module.h> +#include <linux/spinlock.h> +#include <linux/uaccess.h> +#include <linux/atomic.h> +#include <linux/usb.h> +#include <linux/usb/serial.h> + +/* 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[]; +}; + +/* 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(sizeof(struct garmin_packet)+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 = kmalloc(count, GFP_ATOMIC); + if (!buffer) + return -ENOMEM; + + urb = usb_alloc_urb(0, GFP_ATOMIC); + if (!urb) { + kfree(buffer); + return -ENOMEM; + } + + memcpy(buffer, buf, count); + + 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 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 int 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); + del_timer_sync(&garmin_data_p->timer); + kfree(garmin_data_p); + return 0; +} + + +/* All of the device info needed */ +static struct usb_serial_driver garmin_device = { + .driver = { + .owner = THIS_MODULE, + .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, S_IRUGO); +MODULE_PARM_DESC(initial_mode, "Initial mode"); |