diff options
Diffstat (limited to 'drivers/usb/serial/ipw.c')
| -rw-r--r-- | drivers/usb/serial/ipw.c | 313 |
1 files changed, 313 insertions, 0 deletions
diff --git a/drivers/usb/serial/ipw.c b/drivers/usb/serial/ipw.c new file mode 100644 index 000000000..d04c7cc5c --- /dev/null +++ b/drivers/usb/serial/ipw.c @@ -0,0 +1,313 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * IPWireless 3G UMTS TDD Modem driver (USB connected) + * + * Copyright (C) 2004 Roelf Diedericks <roelfd@inet.co.za> + * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com> + * + * All information about the device was acquired using SnoopyPro + * on MSFT's O/S, and examing the MSFT drivers' debug output + * (insanely left _on_ in the enduser version) + * + * It was written out of frustration with the IPWireless USB modem + * supplied by Axity3G/Sentech South Africa not supporting + * Linux whatsoever. + * + * Nobody provided any proprietary information that was not already + * available for this device. + * + * The modem adheres to the "3GPP TS 27.007 AT command set for 3G + * User Equipment (UE)" standard, available from + * http://www.3gpp.org/ftp/Specs/html-info/27007.htm + * + * The code was only tested the IPWireless handheld modem distributed + * in South Africa by Sentech. + * + * It may work for Woosh Inc in .nz too, as it appears they use the + * same kit. + * + * There is still some work to be done in terms of handling + * DCD, DTR, RTS, CTS which are currently faked. + * It's good enough for PPP at this point. It's based off all kinds of + * code found in usb/serial and usb/class + */ + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/tty.h> +#include <linux/tty_flip.h> +#include <linux/module.h> +#include <linux/spinlock.h> +#include <linux/usb.h> +#include <linux/usb/serial.h> +#include <linux/uaccess.h> +#include "usb-wwan.h" + +#define DRIVER_AUTHOR "Roelf Diedericks" +#define DRIVER_DESC "IPWireless tty driver" + +#define IPW_TTY_MAJOR 240 /* real device node major id, experimental range */ +#define IPW_TTY_MINORS 256 /* we support 256 devices, dunno why, it'd be insane :) */ + +#define USB_IPW_MAGIC 0x6d02 /* magic number for ipw struct */ + + +/* Message sizes */ +#define EVENT_BUFFER_SIZE 0xFF +#define CHAR2INT16(c1, c0) (((u32)((c1) & 0xff) << 8) + (u32)((c0) & 0xff)) + +/* vendor/product pairs that are known work with this driver*/ +#define IPW_VID 0x0bc3 +#define IPW_PID 0x0001 + + +/* Vendor commands: */ + +/* baud rates */ +enum { + ipw_sio_b256000 = 0x000e, + ipw_sio_b128000 = 0x001d, + ipw_sio_b115200 = 0x0020, + ipw_sio_b57600 = 0x0040, + ipw_sio_b56000 = 0x0042, + ipw_sio_b38400 = 0x0060, + ipw_sio_b19200 = 0x00c0, + ipw_sio_b14400 = 0x0100, + ipw_sio_b9600 = 0x0180, + ipw_sio_b4800 = 0x0300, + ipw_sio_b2400 = 0x0600, + ipw_sio_b1200 = 0x0c00, + ipw_sio_b600 = 0x1800 +}; + +/* data bits */ +#define ipw_dtb_7 0x700 +#define ipw_dtb_8 0x810 /* ok so the define is misleading, I know, but forces 8,n,1 */ + /* I mean, is there a point to any other setting these days? :) */ + +/* usb control request types : */ +#define IPW_SIO_RXCTL 0x00 /* control bulk rx channel transmissions, value=1/0 (on/off) */ +#define IPW_SIO_SET_BAUD 0x01 /* set baud, value=requested ipw_sio_bxxxx */ +#define IPW_SIO_SET_LINE 0x03 /* set databits, parity. value=ipw_dtb_x */ +#define IPW_SIO_SET_PIN 0x03 /* set/clear dtr/rts value=ipw_pin_xxx */ +#define IPW_SIO_POLL 0x08 /* get serial port status byte, call with value=0 */ +#define IPW_SIO_INIT 0x11 /* initializes ? value=0 (appears as first thing todo on open) */ +#define IPW_SIO_PURGE 0x12 /* purge all transmissions?, call with value=numchar_to_purge */ +#define IPW_SIO_HANDFLOW 0x13 /* set xon/xoff limits value=0, and a buffer of 0x10 bytes */ +#define IPW_SIO_SETCHARS 0x13 /* set the flowcontrol special chars, value=0, buf=6 bytes, */ + /* last 2 bytes contain flowcontrol chars e.g. 00 00 00 00 11 13 */ + +/* values used for request IPW_SIO_SET_PIN */ +#define IPW_PIN_SETDTR 0x101 +#define IPW_PIN_SETRTS 0x202 +#define IPW_PIN_CLRDTR 0x100 +#define IPW_PIN_CLRRTS 0x200 /* unconfirmed */ + +/* values used for request IPW_SIO_RXCTL */ +#define IPW_RXBULK_ON 1 +#define IPW_RXBULK_OFF 0 + +/* various 16 byte hardcoded transferbuffers used by flow control */ +#define IPW_BYTES_FLOWINIT { 0x01, 0, 0, 0, 0x40, 0, 0, 0, \ + 0, 0, 0, 0, 0, 0, 0, 0 } + +/* Interpretation of modem status lines */ +/* These need sorting out by individually connecting pins and checking + * results. FIXME! + * When data is being sent we see 0x30 in the lower byte; this must + * contain DSR and CTS ... + */ +#define IPW_DSR ((1<<4) | (1<<5)) +#define IPW_CTS ((1<<5) | (1<<4)) + +#define IPW_WANTS_TO_SEND 0x30 + +static const struct usb_device_id id_table[] = { + { USB_DEVICE(IPW_VID, IPW_PID) }, + { }, +}; +MODULE_DEVICE_TABLE(usb, id_table); + +static int ipw_open(struct tty_struct *tty, struct usb_serial_port *port) +{ + struct usb_device *udev = port->serial->dev; + struct device *dev = &port->dev; + u8 buf_flow_static[16] = IPW_BYTES_FLOWINIT; + u8 *buf_flow_init; + int result; + + buf_flow_init = kmemdup(buf_flow_static, 16, GFP_KERNEL); + if (!buf_flow_init) + return -ENOMEM; + + /* --1: Tell the modem to initialize (we think) From sniffs this is + * always the first thing that gets sent to the modem during + * opening of the device */ + dev_dbg(dev, "%s: Sending SIO_INIT (we guess)\n", __func__); + result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), + IPW_SIO_INIT, + USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT, + 0, + 0, /* index */ + NULL, + 0, + 100000); + if (result < 0) + dev_err(dev, "Init of modem failed (error = %d)\n", result); + + /* reset the bulk pipes */ + usb_clear_halt(udev, usb_rcvbulkpipe(udev, port->bulk_in_endpointAddress)); + usb_clear_halt(udev, usb_sndbulkpipe(udev, port->bulk_out_endpointAddress)); + + /*--2: Start reading from the device */ + dev_dbg(dev, "%s: setting up bulk read callback\n", __func__); + usb_wwan_open(tty, port); + + /*--3: Tell the modem to open the floodgates on the rx bulk channel */ + dev_dbg(dev, "%s:asking modem for RxRead (RXBULK_ON)\n", __func__); + result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), + IPW_SIO_RXCTL, + USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT, + IPW_RXBULK_ON, + 0, /* index */ + NULL, + 0, + 100000); + if (result < 0) + dev_err(dev, "Enabling bulk RxRead failed (error = %d)\n", result); + + /*--4: setup the initial flowcontrol */ + dev_dbg(dev, "%s:setting init flowcontrol (%s)\n", __func__, buf_flow_init); + result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), + IPW_SIO_HANDFLOW, + USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT, + 0, + 0, + buf_flow_init, + 0x10, + 200000); + if (result < 0) + dev_err(dev, "initial flowcontrol failed (error = %d)\n", result); + + kfree(buf_flow_init); + return 0; +} + +static int ipw_attach(struct usb_serial *serial) +{ + struct usb_wwan_intf_private *data; + + data = kzalloc(sizeof(struct usb_wwan_intf_private), GFP_KERNEL); + if (!data) + return -ENOMEM; + + spin_lock_init(&data->susp_lock); + usb_set_serial_data(serial, data); + return 0; +} + +static void ipw_release(struct usb_serial *serial) +{ + struct usb_wwan_intf_private *data = usb_get_serial_data(serial); + + usb_set_serial_data(serial, NULL); + kfree(data); +} + +static void ipw_dtr_rts(struct usb_serial_port *port, int on) +{ + struct usb_device *udev = port->serial->dev; + struct device *dev = &port->dev; + int result; + + dev_dbg(dev, "%s: on = %d\n", __func__, on); + + result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), + IPW_SIO_SET_PIN, + USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT, + on ? IPW_PIN_SETDTR : IPW_PIN_CLRDTR, + 0, + NULL, + 0, + 200000); + if (result < 0) + dev_err(dev, "setting dtr failed (error = %d)\n", result); + + result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), + IPW_SIO_SET_PIN, USB_TYPE_VENDOR | + USB_RECIP_INTERFACE | USB_DIR_OUT, + on ? IPW_PIN_SETRTS : IPW_PIN_CLRRTS, + 0, + NULL, + 0, + 200000); + if (result < 0) + dev_err(dev, "setting rts failed (error = %d)\n", result); +} + +static void ipw_close(struct usb_serial_port *port) +{ + struct usb_device *udev = port->serial->dev; + struct device *dev = &port->dev; + int result; + + /*--3: purge */ + dev_dbg(dev, "%s:sending purge\n", __func__); + result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), + IPW_SIO_PURGE, USB_TYPE_VENDOR | + USB_RECIP_INTERFACE | USB_DIR_OUT, + 0x03, + 0, + NULL, + 0, + 200000); + if (result < 0) + dev_err(dev, "purge failed (error = %d)\n", result); + + + /* send RXBULK_off (tell modem to stop transmitting bulk data on + rx chan) */ + result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), + IPW_SIO_RXCTL, + USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT, + IPW_RXBULK_OFF, + 0, /* index */ + NULL, + 0, + 100000); + + if (result < 0) + dev_err(dev, "Disabling bulk RxRead failed (error = %d)\n", result); + + usb_wwan_close(port); +} + +static struct usb_serial_driver ipw_device = { + .driver = { + .owner = THIS_MODULE, + .name = "ipw", + }, + .description = "IPWireless converter", + .id_table = id_table, + .num_ports = 1, + .open = ipw_open, + .close = ipw_close, + .attach = ipw_attach, + .release = ipw_release, + .port_probe = usb_wwan_port_probe, + .port_remove = usb_wwan_port_remove, + .dtr_rts = ipw_dtr_rts, + .write = usb_wwan_write, +}; + +static struct usb_serial_driver * const serial_drivers[] = { + &ipw_device, NULL +}; + +module_usb_serial_driver(serial_drivers, id_table); + +/* Module information */ +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); |