summaryrefslogtreecommitdiff
path: root/drivers/usb/serial/ipw.c
blob: 8b1cf18a668be8438f129414bb019f9246d548b9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
/*
 * 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>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 * 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");