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
ipw_open(struct tty_struct * tty,struct usb_serial_port * port)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
ipw_attach(struct usb_serial * serial)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
ipw_release(struct usb_serial * serial)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
ipw_dtr_rts(struct usb_serial_port * port,int on)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
ipw_close(struct usb_serial_port * port)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 .owner = THIS_MODULE,
289 .name = "ipw",
290 },
291 .description = "IPWireless converter",
292 .id_table = id_table,
293 .num_ports = 1,
294 .open = ipw_open,
295 .close = ipw_close,
296 .attach = ipw_attach,
297 .release = ipw_release,
298 .port_probe = usb_wwan_port_probe,
299 .port_remove = usb_wwan_port_remove,
300 .dtr_rts = ipw_dtr_rts,
301 .write = usb_wwan_write,
302 };
303
304 static struct usb_serial_driver * const serial_drivers[] = {
305 &ipw_device, NULL
306 };
307
308 module_usb_serial_driver(serial_drivers, id_table);
309
310 /* Module information */
311 MODULE_AUTHOR(DRIVER_AUTHOR);
312 MODULE_DESCRIPTION(DRIVER_DESC);
313 MODULE_LICENSE("GPL");
314