1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * IPWireless 3G UMTS TDD Modem driver (USB connected) 4 * 5 * Copyright (C) 2004 Roelf Diedericks <roelfd@inet.co.za> 6 * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com> 7 * 8 * All information about the device was acquired using SnoopyPro 9 * on MSFT's O/S, and examing the MSFT drivers' debug output 10 * (insanely left _on_ in the enduser version) 11 * 12 * It was written out of frustration with the IPWireless USB modem 13 * supplied by Axity3G/Sentech South Africa not supporting 14 * Linux whatsoever. 15 * 16 * Nobody provided any proprietary information that was not already 17 * available for this device. 18 * 19 * The modem adheres to the "3GPP TS 27.007 AT command set for 3G 20 * User Equipment (UE)" standard, available from 21 * http://www.3gpp.org/ftp/Specs/html-info/27007.htm 22 * 23 * The code was only tested the IPWireless handheld modem distributed 24 * in South Africa by Sentech. 25 * 26 * It may work for Woosh Inc in .nz too, as it appears they use the 27 * same kit. 28 * 29 * There is still some work to be done in terms of handling 30 * DCD, DTR, RTS, CTS which are currently faked. 31 * It's good enough for PPP at this point. It's based off all kinds of 32 * code found in usb/serial and usb/class 33 */ 34 35 #include <linux/kernel.h> 36 #include <linux/errno.h> 37 #include <linux/slab.h> 38 #include <linux/tty.h> 39 #include <linux/tty_flip.h> 40 #include <linux/module.h> 41 #include <linux/spinlock.h> 42 #include <linux/usb.h> 43 #include <linux/usb/serial.h> 44 #include <linux/uaccess.h> 45 #include "usb-wwan.h" 46 47 #define DRIVER_AUTHOR "Roelf Diedericks" 48 #define DRIVER_DESC "IPWireless tty driver" 49 50 #define IPW_TTY_MAJOR 240 /* real device node major id, experimental range */ 51 #define IPW_TTY_MINORS 256 /* we support 256 devices, dunno why, it'd be insane :) */ 52 53 #define USB_IPW_MAGIC 0x6d02 /* magic number for ipw struct */ 54 55 56 /* Message sizes */ 57 #define EVENT_BUFFER_SIZE 0xFF 58 #define CHAR2INT16(c1, c0) (((u32)((c1) & 0xff) << 8) + (u32)((c0) & 0xff)) 59 60 /* vendor/product pairs that are known work with this driver*/ 61 #define IPW_VID 0x0bc3 62 #define IPW_PID 0x0001 63 64 65 /* Vendor commands: */ 66 67 /* baud rates */ 68 enum { 69 ipw_sio_b256000 = 0x000e, 70 ipw_sio_b128000 = 0x001d, 71 ipw_sio_b115200 = 0x0020, 72 ipw_sio_b57600 = 0x0040, 73 ipw_sio_b56000 = 0x0042, 74 ipw_sio_b38400 = 0x0060, 75 ipw_sio_b19200 = 0x00c0, 76 ipw_sio_b14400 = 0x0100, 77 ipw_sio_b9600 = 0x0180, 78 ipw_sio_b4800 = 0x0300, 79 ipw_sio_b2400 = 0x0600, 80 ipw_sio_b1200 = 0x0c00, 81 ipw_sio_b600 = 0x1800 82 }; 83 84 /* data bits */ 85 #define ipw_dtb_7 0x700 86 #define ipw_dtb_8 0x810 /* ok so the define is misleading, I know, but forces 8,n,1 */ 87 /* I mean, is there a point to any other setting these days? :) */ 88 89 /* usb control request types : */ 90 #define IPW_SIO_RXCTL 0x00 /* control bulk rx channel transmissions, value=1/0 (on/off) */ 91 #define IPW_SIO_SET_BAUD 0x01 /* set baud, value=requested ipw_sio_bxxxx */ 92 #define IPW_SIO_SET_LINE 0x03 /* set databits, parity. value=ipw_dtb_x */ 93 #define IPW_SIO_SET_PIN 0x03 /* set/clear dtr/rts value=ipw_pin_xxx */ 94 #define IPW_SIO_POLL 0x08 /* get serial port status byte, call with value=0 */ 95 #define IPW_SIO_INIT 0x11 /* initializes ? value=0 (appears as first thing todo on open) */ 96 #define IPW_SIO_PURGE 0x12 /* purge all transmissions?, call with value=numchar_to_purge */ 97 #define IPW_SIO_HANDFLOW 0x13 /* set xon/xoff limits value=0, and a buffer of 0x10 bytes */ 98 #define IPW_SIO_SETCHARS 0x13 /* set the flowcontrol special chars, value=0, buf=6 bytes, */ 99 /* last 2 bytes contain flowcontrol chars e.g. 00 00 00 00 11 13 */ 100 101 /* values used for request IPW_SIO_SET_PIN */ 102 #define IPW_PIN_SETDTR 0x101 103 #define IPW_PIN_SETRTS 0x202 104 #define IPW_PIN_CLRDTR 0x100 105 #define IPW_PIN_CLRRTS 0x200 /* unconfirmed */ 106 107 /* values used for request IPW_SIO_RXCTL */ 108 #define IPW_RXBULK_ON 1 109 #define IPW_RXBULK_OFF 0 110 111 /* various 16 byte hardcoded transferbuffers used by flow control */ 112 #define IPW_BYTES_FLOWINIT { 0x01, 0, 0, 0, 0x40, 0, 0, 0, \ 113 0, 0, 0, 0, 0, 0, 0, 0 } 114 115 /* Interpretation of modem status lines */ 116 /* These need sorting out by individually connecting pins and checking 117 * results. FIXME! 118 * When data is being sent we see 0x30 in the lower byte; this must 119 * contain DSR and CTS ... 120 */ 121 #define IPW_DSR ((1<<4) | (1<<5)) 122 #define IPW_CTS ((1<<5) | (1<<4)) 123 124 #define IPW_WANTS_TO_SEND 0x30 125 126 static const struct usb_device_id id_table[] = { 127 { USB_DEVICE(IPW_VID, IPW_PID) }, 128 { }, 129 }; 130 MODULE_DEVICE_TABLE(usb, id_table); 131 132 static int ipw_open(struct tty_struct *tty, struct usb_serial_port *port) 133 { 134 struct usb_device *udev = port->serial->dev; 135 struct device *dev = &port->dev; 136 u8 buf_flow_static[16] = IPW_BYTES_FLOWINIT; 137 u8 *buf_flow_init; 138 int result; 139 140 buf_flow_init = kmemdup(buf_flow_static, 16, GFP_KERNEL); 141 if (!buf_flow_init) 142 return -ENOMEM; 143 144 /* --1: Tell the modem to initialize (we think) From sniffs this is 145 * always the first thing that gets sent to the modem during 146 * opening of the device */ 147 dev_dbg(dev, "%s: Sending SIO_INIT (we guess)\n", __func__); 148 result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 149 IPW_SIO_INIT, 150 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT, 151 0, 152 0, /* index */ 153 NULL, 154 0, 155 100000); 156 if (result < 0) 157 dev_err(dev, "Init of modem failed (error = %d)\n", result); 158 159 /* reset the bulk pipes */ 160 usb_clear_halt(udev, usb_rcvbulkpipe(udev, port->bulk_in_endpointAddress)); 161 usb_clear_halt(udev, usb_sndbulkpipe(udev, port->bulk_out_endpointAddress)); 162 163 /*--2: Start reading from the device */ 164 dev_dbg(dev, "%s: setting up bulk read callback\n", __func__); 165 usb_wwan_open(tty, port); 166 167 /*--3: Tell the modem to open the floodgates on the rx bulk channel */ 168 dev_dbg(dev, "%s:asking modem for RxRead (RXBULK_ON)\n", __func__); 169 result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 170 IPW_SIO_RXCTL, 171 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT, 172 IPW_RXBULK_ON, 173 0, /* index */ 174 NULL, 175 0, 176 100000); 177 if (result < 0) 178 dev_err(dev, "Enabling bulk RxRead failed (error = %d)\n", result); 179 180 /*--4: setup the initial flowcontrol */ 181 dev_dbg(dev, "%s:setting init flowcontrol (%s)\n", __func__, buf_flow_init); 182 result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 183 IPW_SIO_HANDFLOW, 184 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT, 185 0, 186 0, 187 buf_flow_init, 188 0x10, 189 200000); 190 if (result < 0) 191 dev_err(dev, "initial flowcontrol failed (error = %d)\n", result); 192 193 kfree(buf_flow_init); 194 return 0; 195 } 196 197 static int ipw_attach(struct usb_serial *serial) 198 { 199 struct usb_wwan_intf_private *data; 200 201 data = kzalloc(sizeof(struct usb_wwan_intf_private), GFP_KERNEL); 202 if (!data) 203 return -ENOMEM; 204 205 spin_lock_init(&data->susp_lock); 206 usb_set_serial_data(serial, data); 207 return 0; 208 } 209 210 static void ipw_release(struct usb_serial *serial) 211 { 212 struct usb_wwan_intf_private *data = usb_get_serial_data(serial); 213 214 usb_set_serial_data(serial, NULL); 215 kfree(data); 216 } 217 218 static void ipw_dtr_rts(struct usb_serial_port *port, int on) 219 { 220 struct usb_device *udev = port->serial->dev; 221 struct device *dev = &port->dev; 222 int result; 223 224 dev_dbg(dev, "%s: on = %d\n", __func__, on); 225 226 result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 227 IPW_SIO_SET_PIN, 228 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT, 229 on ? IPW_PIN_SETDTR : IPW_PIN_CLRDTR, 230 0, 231 NULL, 232 0, 233 200000); 234 if (result < 0) 235 dev_err(dev, "setting dtr failed (error = %d)\n", result); 236 237 result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 238 IPW_SIO_SET_PIN, USB_TYPE_VENDOR | 239 USB_RECIP_INTERFACE | USB_DIR_OUT, 240 on ? IPW_PIN_SETRTS : IPW_PIN_CLRRTS, 241 0, 242 NULL, 243 0, 244 200000); 245 if (result < 0) 246 dev_err(dev, "setting rts failed (error = %d)\n", result); 247 } 248 249 static void ipw_close(struct usb_serial_port *port) 250 { 251 struct usb_device *udev = port->serial->dev; 252 struct device *dev = &port->dev; 253 int result; 254 255 /*--3: purge */ 256 dev_dbg(dev, "%s:sending purge\n", __func__); 257 result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 258 IPW_SIO_PURGE, USB_TYPE_VENDOR | 259 USB_RECIP_INTERFACE | USB_DIR_OUT, 260 0x03, 261 0, 262 NULL, 263 0, 264 200000); 265 if (result < 0) 266 dev_err(dev, "purge failed (error = %d)\n", result); 267 268 269 /* send RXBULK_off (tell modem to stop transmitting bulk data on 270 rx chan) */ 271 result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 272 IPW_SIO_RXCTL, 273 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT, 274 IPW_RXBULK_OFF, 275 0, /* index */ 276 NULL, 277 0, 278 100000); 279 280 if (result < 0) 281 dev_err(dev, "Disabling bulk RxRead failed (error = %d)\n", result); 282 283 usb_wwan_close(port); 284 } 285 286 static struct usb_serial_driver ipw_device = { 287 .driver = { 288 .name = "ipw", 289 }, 290 .description = "IPWireless converter", 291 .id_table = id_table, 292 .num_ports = 1, 293 .open = ipw_open, 294 .close = ipw_close, 295 .attach = ipw_attach, 296 .release = ipw_release, 297 .port_probe = usb_wwan_port_probe, 298 .port_remove = usb_wwan_port_remove, 299 .dtr_rts = ipw_dtr_rts, 300 .write = usb_wwan_write, 301 }; 302 303 static struct usb_serial_driver * const serial_drivers[] = { 304 &ipw_device, NULL 305 }; 306 307 module_usb_serial_driver(serial_drivers, id_table); 308 309 /* Module information */ 310 MODULE_AUTHOR(DRIVER_AUTHOR); 311 MODULE_DESCRIPTION(DRIVER_DESC); 312 MODULE_LICENSE("GPL"); 313