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initial commit with v2.6.9
[linux-2.6.9-moxart.git] / drivers / net / hamradio / yam.c
blobc516e7156ca135514471991bf162403f5b0c0990
1 /*****************************************************************************/
2
3 /*
4 * yam.c -- YAM radio modem driver.
5 *
6 * Copyright (C) 1998 Frederic Rible F1OAT (frible@teaser.fr)
7 * Adapted from baycom.c driver written by Thomas Sailer (sailer@ife.ee.ethz.ch)
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *
23 * Please note that the GPL allows you to use the driver, NOT the radio.
24 * In order to use the radio, you need a license from the communications
25 * authority of your country.
26 *
27 *
28 * History:
29 * 0.0 F1OAT 06.06.98 Begin of work with baycom.c source code V 0.3
30 * 0.1 F1OAT 07.06.98 Add timer polling routine for channel arbitration
31 * 0.2 F6FBB 08.06.98 Added delay after FPGA programming
32 * 0.3 F6FBB 29.07.98 Delayed PTT implementation for dupmode=2
33 * 0.4 F6FBB 30.07.98 Added TxTail, Slottime and Persistance
34 * 0.5 F6FBB 01.08.98 Shared IRQs, /proc/net and network statistics
35 * 0.6 F6FBB 25.08.98 Added 1200Bds format
36 * 0.7 F6FBB 12.09.98 Added to the kernel configuration
37 * 0.8 F6FBB 14.10.98 Fixed slottime/persistence timing bug
38 * OK1ZIA 2.09.01 Fixed "kfree_skb on hard IRQ"
39 * using dev_kfree_skb_any(). (important in 2.4 kernel)
40 *
41 */
42
43 /*****************************************************************************/
44
45 #include <linux/config.h>
46 #include <linux/module.h>
47 #include <linux/types.h>
48 #include <linux/net.h>
49 #include <linux/in.h>
50 #include <linux/if.h>
51 #include <linux/slab.h>
52 #include <linux/errno.h>
53 #include <asm/bitops.h>
54 #include <asm/io.h>
55 #include <asm/system.h>
56 #include <linux/interrupt.h>
57 #include <linux/ioport.h>
58
59 #include <linux/netdevice.h>
60 #include <linux/if_arp.h>
61 #include <linux/etherdevice.h>
62 #include <linux/skbuff.h>
63 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
64 /* prototypes for ax25_encapsulate and ax25_rebuild_header */
65 #include <net/ax25.h>
66 #endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
67
68 /* make genksyms happy */
69 #include <linux/ip.h>
70 #include <linux/udp.h>
71 #include <linux/tcp.h>
72
73 #include <linux/kernel.h>
74 #include <linux/proc_fs.h>
75 #include <linux/seq_file.h>
76
77 #include <asm/uaccess.h>
78 #include <linux/init.h>
79
80 #include <linux/yam.h>
81 #include "yam9600.h"
82 #include "yam1200.h"
83
84 /* --------------------------------------------------------------------- */
85
86 static const char yam_drvname[] = "yam";
87 static char yam_drvinfo[] __initdata = KERN_INFO "YAM driver version 0.8 by F1OAT/F6FBB\n";
88
89 /* --------------------------------------------------------------------- */
90
91 #define YAM_9600 1
92 #define YAM_1200 2
93
94 #define NR_PORTS 4
95 #define YAM_MAGIC 0xF10A7654
96
97 /* Transmitter states */
98
99 #define TX_OFF 0
100 #define TX_HEAD 1
101 #define TX_DATA 2
102 #define TX_CRC1 3
103 #define TX_CRC2 4
104 #define TX_TAIL 5
105
106 #define YAM_MAX_FRAME 1024
107
108 #define DEFAULT_BITRATE 9600 /* bps */
109 #define DEFAULT_HOLDD 10 /* sec */
110 #define DEFAULT_TXD 300 /* ms */
111 #define DEFAULT_TXTAIL 10 /* ms */
112 #define DEFAULT_SLOT 100 /* ms */
113 #define DEFAULT_PERS 64 /* 0->255 */
114
115 struct yam_port {
116 int magic;
117 int bitrate;
118 int baudrate;
119 int iobase;
120 int irq;
121 int dupmode;
122
123 struct net_device *dev;
124
125 /* Stats section */
126
127 struct net_device_stats stats;
128
129 int nb_rxint;
130 int nb_mdint;
131
132 /* Parameters section */
133
134 int txd; /* tx delay */
135 int holdd; /* duplex ptt delay */
136 int txtail; /* txtail delay */
137 int slot; /* slottime */
138 int pers; /* persistence */
139
140 /* Tx section */
141
142 int tx_state;
143 int tx_count;
144 int slotcnt;
145 unsigned char tx_buf[YAM_MAX_FRAME];
146 int tx_len;
147 int tx_crcl, tx_crch;
148 struct sk_buff_head send_queue; /* Packets awaiting transmission */
149
150 /* Rx section */
151
152 int dcd;
153 unsigned char rx_buf[YAM_MAX_FRAME];
154 int rx_len;
155 int rx_crcl, rx_crch;
156 };
157
158 struct yam_mcs {
159 unsigned char bits[YAM_FPGA_SIZE];
160 int bitrate;
161 struct yam_mcs *next;
162 };
163
164 static struct net_device *yam_devs[NR_PORTS];
165
166 static struct yam_mcs *yam_data;
167
168 static char ax25_bcast[7] =
169 {'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1};
170 static char ax25_test[7] =
171 {'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1};
172
173 static struct timer_list yam_timer = TIMER_INITIALIZER(NULL, 0, 0);
174
175 /* --------------------------------------------------------------------- */
176
177 #define RBR(iobase) (iobase+0)
178 #define THR(iobase) (iobase+0)
179 #define IER(iobase) (iobase+1)
180 #define IIR(iobase) (iobase+2)
181 #define FCR(iobase) (iobase+2)
182 #define LCR(iobase) (iobase+3)
183 #define MCR(iobase) (iobase+4)
184 #define LSR(iobase) (iobase+5)
185 #define MSR(iobase) (iobase+6)
186 #define SCR(iobase) (iobase+7)
187 #define DLL(iobase) (iobase+0)
188 #define DLM(iobase) (iobase+1)
189
190 #define YAM_EXTENT 8
191
192 /* Interrupt Identification Register Bit Masks */
193 #define IIR_NOPEND 1
194 #define IIR_MSR 0
195 #define IIR_TX 2
196 #define IIR_RX 4
197 #define IIR_LSR 6
198 #define IIR_TIMEOUT 12 /* Fifo mode only */
199
200 #define IIR_MASK 0x0F
201
202 /* Interrupt Enable Register Bit Masks */
203 #define IER_RX 1 /* enable rx interrupt */
204 #define IER_TX 2 /* enable tx interrupt */
205 #define IER_LSR 4 /* enable line status interrupts */
206 #define IER_MSR 8 /* enable modem status interrupts */
207
208 /* Modem Control Register Bit Masks */
209 #define MCR_DTR 0x01 /* DTR output */
210 #define MCR_RTS 0x02 /* RTS output */
211 #define MCR_OUT1 0x04 /* OUT1 output (not accessible in RS232) */
212 #define MCR_OUT2 0x08 /* Master Interrupt enable (must be set on PCs) */
213 #define MCR_LOOP 0x10 /* Loopback enable */
214
215 /* Modem Status Register Bit Masks */
216 #define MSR_DCTS 0x01 /* Delta CTS input */
217 #define MSR_DDSR 0x02 /* Delta DSR */
218 #define MSR_DRIN 0x04 /* Delta RI */
219 #define MSR_DDCD 0x08 /* Delta DCD */
220 #define MSR_CTS 0x10 /* CTS input */
221 #define MSR_DSR 0x20 /* DSR input */
222 #define MSR_RING 0x40 /* RI input */
223 #define MSR_DCD 0x80 /* DCD input */
224
225 /* line status register bit mask */
226 #define LSR_RXC 0x01
227 #define LSR_OE 0x02
228 #define LSR_PE 0x04
229 #define LSR_FE 0x08
230 #define LSR_BREAK 0x10
231 #define LSR_THRE 0x20
232 #define LSR_TSRE 0x40
233
234 /* Line Control Register Bit Masks */
235 #define LCR_DLAB 0x80
236 #define LCR_BREAK 0x40
237 #define LCR_PZERO 0x28
238 #define LCR_PEVEN 0x18
239 #define LCR_PODD 0x08
240 #define LCR_STOP1 0x00
241 #define LCR_STOP2 0x04
242 #define LCR_BIT5 0x00
243 #define LCR_BIT6 0x02
244 #define LCR_BIT7 0x01
245 #define LCR_BIT8 0x03
246
247 /* YAM Modem <-> UART Port mapping */
248
249 #define TX_RDY MSR_DCTS /* transmitter ready to send */
250 #define RX_DCD MSR_DCD /* carrier detect */
251 #define RX_FLAG MSR_RING /* hdlc flag received */
252 #define FPGA_DONE MSR_DSR /* FPGA is configured */
253 #define PTT_ON (MCR_RTS|MCR_OUT2) /* activate PTT */
254 #define PTT_OFF (MCR_DTR|MCR_OUT2) /* release PTT */
255
256 #define ENABLE_RXINT IER_RX /* enable uart rx interrupt during rx */
257 #define ENABLE_TXINT IER_MSR /* enable uart ms interrupt during tx */
258 #define ENABLE_RTXINT (IER_RX|IER_MSR) /* full duplex operations */
259
260
261 /*************************************************************************
262 * CRC Tables
263 ************************************************************************/
264
265 static const unsigned char chktabl[256] =
266 {0x00, 0x89, 0x12, 0x9b, 0x24, 0xad, 0x36, 0xbf, 0x48, 0xc1, 0x5a, 0xd3, 0x6c, 0xe5, 0x7e,
267 0xf7, 0x81, 0x08, 0x93, 0x1a, 0xa5, 0x2c, 0xb7, 0x3e, 0xc9, 0x40, 0xdb, 0x52, 0xed, 0x64,
268 0xff, 0x76, 0x02, 0x8b, 0x10, 0x99, 0x26, 0xaf, 0x34, 0xbd, 0x4a, 0xc3, 0x58, 0xd1, 0x6e,
269 0xe7, 0x7c, 0xf5, 0x83, 0x0a, 0x91, 0x18, 0xa7, 0x2e, 0xb5, 0x3c, 0xcb, 0x42, 0xd9, 0x50,
270 0xef, 0x66, 0xfd, 0x74, 0x04, 0x8d, 0x16, 0x9f, 0x20, 0xa9, 0x32, 0xbb, 0x4c, 0xc5, 0x5e,
271 0xd7, 0x68, 0xe1, 0x7a, 0xf3, 0x85, 0x0c, 0x97, 0x1e, 0xa1, 0x28, 0xb3, 0x3a, 0xcd, 0x44,
272 0xdf, 0x56, 0xe9, 0x60, 0xfb, 0x72, 0x06, 0x8f, 0x14, 0x9d, 0x22, 0xab, 0x30, 0xb9, 0x4e,
273 0xc7, 0x5c, 0xd5, 0x6a, 0xe3, 0x78, 0xf1, 0x87, 0x0e, 0x95, 0x1c, 0xa3, 0x2a, 0xb1, 0x38,
274 0xcf, 0x46, 0xdd, 0x54, 0xeb, 0x62, 0xf9, 0x70, 0x08, 0x81, 0x1a, 0x93, 0x2c, 0xa5, 0x3e,
275 0xb7, 0x40, 0xc9, 0x52, 0xdb, 0x64, 0xed, 0x76, 0xff, 0x89, 0x00, 0x9b, 0x12, 0xad, 0x24,
276 0xbf, 0x36, 0xc1, 0x48, 0xd3, 0x5a, 0xe5, 0x6c, 0xf7, 0x7e, 0x0a, 0x83, 0x18, 0x91, 0x2e,
277 0xa7, 0x3c, 0xb5, 0x42, 0xcb, 0x50, 0xd9, 0x66, 0xef, 0x74, 0xfd, 0x8b, 0x02, 0x99, 0x10,
278 0xaf, 0x26, 0xbd, 0x34, 0xc3, 0x4a, 0xd1, 0x58, 0xe7, 0x6e, 0xf5, 0x7c, 0x0c, 0x85, 0x1e,
279 0x97, 0x28, 0xa1, 0x3a, 0xb3, 0x44, 0xcd, 0x56, 0xdf, 0x60, 0xe9, 0x72, 0xfb, 0x8d, 0x04,
280 0x9f, 0x16, 0xa9, 0x20, 0xbb, 0x32, 0xc5, 0x4c, 0xd7, 0x5e, 0xe1, 0x68, 0xf3, 0x7a, 0x0e,
281 0x87, 0x1c, 0x95, 0x2a, 0xa3, 0x38, 0xb1, 0x46, 0xcf, 0x54, 0xdd, 0x62, 0xeb, 0x70, 0xf9,
282 0x8f, 0x06, 0x9d, 0x14, 0xab, 0x22, 0xb9, 0x30, 0xc7, 0x4e, 0xd5, 0x5c, 0xe3, 0x6a, 0xf1,
283 0x78};
284 static const unsigned char chktabh[256] =
285 {0x00, 0x11, 0x23, 0x32, 0x46, 0x57, 0x65, 0x74, 0x8c, 0x9d, 0xaf, 0xbe, 0xca, 0xdb, 0xe9,
286 0xf8, 0x10, 0x01, 0x33, 0x22, 0x56, 0x47, 0x75, 0x64, 0x9c, 0x8d, 0xbf, 0xae, 0xda, 0xcb,
287 0xf9, 0xe8, 0x21, 0x30, 0x02, 0x13, 0x67, 0x76, 0x44, 0x55, 0xad, 0xbc, 0x8e, 0x9f, 0xeb,
288 0xfa, 0xc8, 0xd9, 0x31, 0x20, 0x12, 0x03, 0x77, 0x66, 0x54, 0x45, 0xbd, 0xac, 0x9e, 0x8f,
289 0xfb, 0xea, 0xd8, 0xc9, 0x42, 0x53, 0x61, 0x70, 0x04, 0x15, 0x27, 0x36, 0xce, 0xdf, 0xed,
290 0xfc, 0x88, 0x99, 0xab, 0xba, 0x52, 0x43, 0x71, 0x60, 0x14, 0x05, 0x37, 0x26, 0xde, 0xcf,
291 0xfd, 0xec, 0x98, 0x89, 0xbb, 0xaa, 0x63, 0x72, 0x40, 0x51, 0x25, 0x34, 0x06, 0x17, 0xef,
292 0xfe, 0xcc, 0xdd, 0xa9, 0xb8, 0x8a, 0x9b, 0x73, 0x62, 0x50, 0x41, 0x35, 0x24, 0x16, 0x07,
293 0xff, 0xee, 0xdc, 0xcd, 0xb9, 0xa8, 0x9a, 0x8b, 0x84, 0x95, 0xa7, 0xb6, 0xc2, 0xd3, 0xe1,
294 0xf0, 0x08, 0x19, 0x2b, 0x3a, 0x4e, 0x5f, 0x6d, 0x7c, 0x94, 0x85, 0xb7, 0xa6, 0xd2, 0xc3,
295 0xf1, 0xe0, 0x18, 0x09, 0x3b, 0x2a, 0x5e, 0x4f, 0x7d, 0x6c, 0xa5, 0xb4, 0x86, 0x97, 0xe3,
296 0xf2, 0xc0, 0xd1, 0x29, 0x38, 0x0a, 0x1b, 0x6f, 0x7e, 0x4c, 0x5d, 0xb5, 0xa4, 0x96, 0x87,
297 0xf3, 0xe2, 0xd0, 0xc1, 0x39, 0x28, 0x1a, 0x0b, 0x7f, 0x6e, 0x5c, 0x4d, 0xc6, 0xd7, 0xe5,
298 0xf4, 0x80, 0x91, 0xa3, 0xb2, 0x4a, 0x5b, 0x69, 0x78, 0x0c, 0x1d, 0x2f, 0x3e, 0xd6, 0xc7,
299 0xf5, 0xe4, 0x90, 0x81, 0xb3, 0xa2, 0x5a, 0x4b, 0x79, 0x68, 0x1c, 0x0d, 0x3f, 0x2e, 0xe7,
300 0xf6, 0xc4, 0xd5, 0xa1, 0xb0, 0x82, 0x93, 0x6b, 0x7a, 0x48, 0x59, 0x2d, 0x3c, 0x0e, 0x1f,
301 0xf7, 0xe6, 0xd4, 0xc5, 0xb1, 0xa0, 0x92, 0x83, 0x7b, 0x6a, 0x58, 0x49, 0x3d, 0x2c, 0x1e,
302 0x0f};
303
304 /*************************************************************************
305 * FPGA functions
306 ************************************************************************/
307
308 static void delay(int ms)
309 {
310 unsigned long timeout = jiffies + ((ms * HZ) / 1000);
311 while (time_before(jiffies, timeout))
312 cpu_relax();
313 }
314
315 /*
316 * reset FPGA
317 */
318
319 static void fpga_reset(int iobase)
320 {
321 outb(0, IER(iobase));
322 outb(LCR_DLAB | LCR_BIT5, LCR(iobase));
323 outb(1, DLL(iobase));
324 outb(0, DLM(iobase));
325
326 outb(LCR_BIT5, LCR(iobase));
327 inb(LSR(iobase));
328 inb(MSR(iobase));
329 /* turn off FPGA supply voltage */
330 outb(MCR_OUT1 | MCR_OUT2, MCR(iobase));
331 delay(100);
332 /* turn on FPGA supply voltage again */
333 outb(MCR_DTR | MCR_RTS | MCR_OUT1 | MCR_OUT2, MCR(iobase));
334 delay(100);
335 }
336
337 /*
338 * send one byte to FPGA
339 */
340
341 static int fpga_write(int iobase, unsigned char wrd)
342 {
343 unsigned char bit;
344 int k;
345 unsigned long timeout = jiffies + HZ / 10;
346
347 for (k = 0; k < 8; k++) {
348 bit = (wrd & 0x80) ? (MCR_RTS | MCR_DTR) : MCR_DTR;
349 outb(bit | MCR_OUT1 | MCR_OUT2, MCR(iobase));
350 wrd <<= 1;
351 outb(0xfc, THR(iobase));
352 while ((inb(LSR(iobase)) & LSR_TSRE) == 0)
353 if (time_after(jiffies, timeout))
354 return -1;
355 }
356
357 return 0;
358 }
359
360 static unsigned char *add_mcs(unsigned char *bits, int bitrate)
361 {
362 struct yam_mcs *p;
363
364 /* If it already exists, replace the bit data */
365 p = yam_data;
366 while (p) {
367 if (p->bitrate == bitrate) {
368 memcpy(p->bits, bits, YAM_FPGA_SIZE);
369 return p->bits;
370 }
371 p = p->next;
372 }
373
374 /* Allocate a new mcs */
375 if ((p = kmalloc(sizeof(struct yam_mcs), GFP_KERNEL)) == NULL) {
376 printk(KERN_WARNING "YAM: no memory to allocate mcs\n");
377 return NULL;
378 }
379 memcpy(p->bits, bits, YAM_FPGA_SIZE);
380 p->bitrate = bitrate;
381 p->next = yam_data;
382 yam_data = p;
383
384 return p->bits;
385 }
386
387 static unsigned char *get_mcs(int bitrate)
388 {
389 struct yam_mcs *p;
390
391 p = yam_data;
392 while (p) {
393 if (p->bitrate == bitrate)
394 return p->bits;
395 p = p->next;
396 }
397
398 /* Load predefined mcs data */
399 switch (bitrate) {
400 case 1200:
401 return add_mcs(bits_1200, bitrate);
402 default:
403 return add_mcs(bits_9600, bitrate);
404 }
405 }
406
407 /*
408 * download bitstream to FPGA
409 * data is contained in bits[] array in yam1200.h resp. yam9600.h
410 */
411
412 static int fpga_download(int iobase, int bitrate)
413 {
414 int i, rc;
415 unsigned char *pbits;
416
417 pbits = get_mcs(bitrate);
418 if (pbits == NULL)
419 return -1;
420
421 fpga_reset(iobase);
422 for (i = 0; i < YAM_FPGA_SIZE; i++) {
423 if (fpga_write(iobase, pbits[i])) {
424 printk(KERN_ERR "yam: error in write cycle\n");
425 return -1; /* write... */
426 }
427 }
428
429 fpga_write(iobase, 0xFF);
430 rc = inb(MSR(iobase)); /* check DONE signal */
431
432 /* Needed for some hardwares */
433 delay(50);
434
435 return (rc & MSR_DSR) ? 0 : -1;
436 }
437
438
439 /************************************************************************
440 * Serial port init
441 ************************************************************************/
442
443 static void yam_set_uart(struct net_device *dev)
444 {
445 struct yam_port *yp = (struct yam_port *) dev->priv;
446 int divisor = 115200 / yp->baudrate;
447
448 outb(0, IER(dev->base_addr));
449 outb(LCR_DLAB | LCR_BIT8, LCR(dev->base_addr));
450 outb(divisor, DLL(dev->base_addr));
451 outb(0, DLM(dev->base_addr));
452 outb(LCR_BIT8, LCR(dev->base_addr));
453 outb(PTT_OFF, MCR(dev->base_addr));
454 outb(0x00, FCR(dev->base_addr));
455
456 /* Flush pending irq */
457
458 inb(RBR(dev->base_addr));
459 inb(MSR(dev->base_addr));
460
461 /* Enable rx irq */
462
463 outb(ENABLE_RTXINT, IER(dev->base_addr));
464 }
465
466
467 /* --------------------------------------------------------------------- */
468
469 enum uart {
470 c_uart_unknown, c_uart_8250,
471 c_uart_16450, c_uart_16550, c_uart_16550A
472 };
473
474 static const char *uart_str[] =
475 {"unknown", "8250", "16450", "16550", "16550A"};
476
477 static enum uart yam_check_uart(unsigned int iobase)
478 {
479 unsigned char b1, b2, b3;
480 enum uart u;
481 enum uart uart_tab[] =
482 {c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A};
483
484 b1 = inb(MCR(iobase));
485 outb(b1 | 0x10, MCR(iobase)); /* loopback mode */
486 b2 = inb(MSR(iobase));
487 outb(0x1a, MCR(iobase));
488 b3 = inb(MSR(iobase)) & 0xf0;
489 outb(b1, MCR(iobase)); /* restore old values */
490 outb(b2, MSR(iobase));
491 if (b3 != 0x90)
492 return c_uart_unknown;
493 inb(RBR(iobase));
494 inb(RBR(iobase));
495 outb(0x01, FCR(iobase)); /* enable FIFOs */
496 u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
497 if (u == c_uart_16450) {
498 outb(0x5a, SCR(iobase));
499 b1 = inb(SCR(iobase));
500 outb(0xa5, SCR(iobase));
501 b2 = inb(SCR(iobase));
502 if ((b1 != 0x5a) || (b2 != 0xa5))
503 u = c_uart_8250;
504 }
505 return u;
506 }
507
508 /******************************************************************************
509 * Rx Section
510 ******************************************************************************/
511 static inline void yam_rx_flag(struct net_device *dev, struct yam_port *yp)
512 {
513 if (yp->dcd && yp->rx_len >= 3 && yp->rx_len < YAM_MAX_FRAME) {
514 int pkt_len = yp->rx_len - 2 + 1; /* -CRC + kiss */
515 struct sk_buff *skb;
516
517 if ((yp->rx_crch & yp->rx_crcl) != 0xFF) {
518 /* Bad crc */
519 } else {
520 if (!(skb = dev_alloc_skb(pkt_len))) {
521 printk(KERN_WARNING "%s: memory squeeze, dropping packet\n", dev->name);
522 ++yp->stats.rx_dropped;
523 } else {
524 unsigned char *cp;
525 skb->dev = dev;
526 cp = skb_put(skb, pkt_len);
527 *cp++ = 0; /* KISS kludge */
528 memcpy(cp, yp->rx_buf, pkt_len - 1);
529 skb->protocol = htons(ETH_P_AX25);
530 skb->mac.raw = skb->data;
531 netif_rx(skb);
532 dev->last_rx = jiffies;
533 ++yp->stats.rx_packets;
534 }
535 }
536 }
537 yp->rx_len = 0;
538 yp->rx_crcl = 0x21;
539 yp->rx_crch = 0xf3;
540 }
541
542 static inline void yam_rx_byte(struct net_device *dev, struct yam_port *yp, unsigned char rxb)
543 {
544 if (yp->rx_len < YAM_MAX_FRAME) {
545 unsigned char c = yp->rx_crcl;
546 yp->rx_crcl = (chktabl[c] ^ yp->rx_crch);
547 yp->rx_crch = (chktabh[c] ^ rxb);
548 yp->rx_buf[yp->rx_len++] = rxb;
549 }
550 }
551
552 /********************************************************************************
553 * TX Section
554 ********************************************************************************/
555
556 static void ptt_on(struct net_device *dev)
557 {
558 outb(PTT_ON, MCR(dev->base_addr));
559 }
560
561 static void ptt_off(struct net_device *dev)
562 {
563 outb(PTT_OFF, MCR(dev->base_addr));
564 }
565
566 static int yam_send_packet(struct sk_buff *skb, struct net_device *dev)
567 {
568 struct yam_port *yp = dev->priv;
569
570 skb_queue_tail(&yp->send_queue, skb);
571 dev->trans_start = jiffies;
572 return 0;
573 }
574
575 static void yam_start_tx(struct net_device *dev, struct yam_port *yp)
576 {
577 if ((yp->tx_state == TX_TAIL) || (yp->txd == 0))
578 yp->tx_count = 1;
579 else
580 yp->tx_count = (yp->bitrate * yp->txd) / 8000;
581 yp->tx_state = TX_HEAD;
582 ptt_on(dev);
583 }
584
585 static unsigned short random_seed;
586
587 static inline unsigned short random_num(void)
588 {
589 random_seed = 28629 * random_seed + 157;
590 return random_seed;
591 }
592
593 static void yam_arbitrate(struct net_device *dev)
594 {
595 struct yam_port *yp = dev->priv;
596
597 if (!yp || yp->magic != YAM_MAGIC
598 || yp->tx_state != TX_OFF || skb_queue_empty(&yp->send_queue)) {
599 return;
600 }
601 /* tx_state is TX_OFF and there is data to send */
602
603 if (yp->dupmode) {
604 /* Full duplex mode, don't wait */
605 yam_start_tx(dev, yp);
606 return;
607 }
608 if (yp->dcd) {
609 /* DCD on, wait slotime ... */
610 yp->slotcnt = yp->slot / 10;
611 return;
612 }
613 /* Is slottime passed ? */
614 if ((--yp->slotcnt) > 0)
615 return;
616
617 yp->slotcnt = yp->slot / 10;
618
619 /* is random > persist ? */
620 if ((random_num() % 256) > yp->pers)
621 return;
622
623 yam_start_tx(dev, yp);
624 }
625
626 static void yam_dotimer(unsigned long dummy)
627 {
628 int i;
629
630 for (i = 0; i < NR_PORTS; i++) {
631 struct net_device *dev = yam_devs[i];
632 if (dev && netif_running(dev))
633 yam_arbitrate(dev);
634 }
635 yam_timer.expires = jiffies + HZ / 100;
636 add_timer(&yam_timer);
637 }
638
639 static void yam_tx_byte(struct net_device *dev, struct yam_port *yp)
640 {
641 struct sk_buff *skb;
642 unsigned char b, temp;
643
644 switch (yp->tx_state) {
645 case TX_OFF:
646 break;
647 case TX_HEAD:
648 if (--yp->tx_count <= 0) {
649 if (!(skb = skb_dequeue(&yp->send_queue))) {
650 ptt_off(dev);
651 yp->tx_state = TX_OFF;
652 break;
653 }
654 yp->tx_state = TX_DATA;
655 if (skb->data[0] != 0) {
656 /* do_kiss_params(s, skb->data, skb->len); */
657 dev_kfree_skb_any(skb);
658 break;
659 }
660 yp->tx_len = skb->len - 1; /* strip KISS byte */
661 if (yp->tx_len >= YAM_MAX_FRAME || yp->tx_len < 2) {
662 dev_kfree_skb_any(skb);
663 break;
664 }
665 memcpy(yp->tx_buf, skb->data + 1, yp->tx_len);
666 dev_kfree_skb_any(skb);
667 yp->tx_count = 0;
668 yp->tx_crcl = 0x21;
669 yp->tx_crch = 0xf3;
670 yp->tx_state = TX_DATA;
671 }
672 break;
673 case TX_DATA:
674 b = yp->tx_buf[yp->tx_count++];
675 outb(b, THR(dev->base_addr));
676 temp = yp->tx_crcl;
677 yp->tx_crcl = chktabl[temp] ^ yp->tx_crch;
678 yp->tx_crch = chktabh[temp] ^ b;
679 if (yp->tx_count >= yp->tx_len) {
680 yp->tx_state = TX_CRC1;
681 }
682 break;
683 case TX_CRC1:
684 yp->tx_crch = chktabl[yp->tx_crcl] ^ yp->tx_crch;
685 yp->tx_crcl = chktabh[yp->tx_crcl] ^ chktabl[yp->tx_crch] ^ 0xff;
686 outb(yp->tx_crcl, THR(dev->base_addr));
687 yp->tx_state = TX_CRC2;
688 break;
689 case TX_CRC2:
690 outb(chktabh[yp->tx_crch] ^ 0xFF, THR(dev->base_addr));
691 if (skb_queue_empty(&yp->send_queue)) {
692 yp->tx_count = (yp->bitrate * yp->txtail) / 8000;
693 if (yp->dupmode == 2)
694 yp->tx_count += (yp->bitrate * yp->holdd) / 8;
695 if (yp->tx_count == 0)
696 yp->tx_count = 1;
697 yp->tx_state = TX_TAIL;
698 } else {
699 yp->tx_count = 1;
700 yp->tx_state = TX_HEAD;
701 }
702 ++yp->stats.tx_packets;
703 break;
704 case TX_TAIL:
705 if (--yp->tx_count <= 0) {
706 yp->tx_state = TX_OFF;
707 ptt_off(dev);
708 }
709 break;
710 }
711 }
712
713 /***********************************************************************************
714 * ISR routine
715 ************************************************************************************/
716
717 static irqreturn_t yam_interrupt(int irq, void *dev_id, struct pt_regs *regs)
718 {
719 struct net_device *dev;
720 struct yam_port *yp;
721 unsigned char iir;
722 int counter = 100;
723 int i;
724 int handled = 0;
725
726 for (i = 0; i < NR_PORTS; i++) {
727 dev = yam_devs[i];
728 yp = dev->priv;
729
730 if (!netif_running(dev))
731 continue;
732
733 while ((iir = IIR_MASK & inb(IIR(dev->base_addr))) != IIR_NOPEND) {
734 unsigned char msr = inb(MSR(dev->base_addr));
735 unsigned char lsr = inb(LSR(dev->base_addr));
736 unsigned char rxb;
737
738 handled = 1;
739
740 if (lsr & LSR_OE)
741 ++yp->stats.rx_fifo_errors;
742
743 yp->dcd = (msr & RX_DCD) ? 1 : 0;
744
745 if (--counter <= 0) {
746 printk(KERN_ERR "%s: too many irq iir=%d\n",
747 dev->name, iir);
748 goto out;
749 }
750 if (msr & TX_RDY) {
751 ++yp->nb_mdint;
752 yam_tx_byte(dev, yp);
753 }
754 if (lsr & LSR_RXC) {
755 ++yp->nb_rxint;
756 rxb = inb(RBR(dev->base_addr));
757 if (msr & RX_FLAG)
758 yam_rx_flag(dev, yp);
759 else
760 yam_rx_byte(dev, yp, rxb);
761 }
762 }
763 }
764 out:
765 return IRQ_RETVAL(handled);
766 }
767
768 #ifdef CONFIG_PROC_FS
769
770 static void *yam_seq_start(struct seq_file *seq, loff_t *pos)
771 {
772 return (*pos < NR_PORTS) ? yam_devs[*pos] : NULL;
773 }
774
775 static void *yam_seq_next(struct seq_file *seq, void *v, loff_t *pos)
776 {
777 ++*pos;
778 return (*pos < NR_PORTS) ? yam_devs[*pos] : NULL;
779 }
780
781 static void yam_seq_stop(struct seq_file *seq, void *v)
782 {
783 }
784
785 static int yam_seq_show(struct seq_file *seq, void *v)
786 {
787 const struct net_device *dev = v;
788 const struct yam_port *yp = dev->priv;
789
790 seq_printf(seq, "Device %s\n", dev->name);
791 seq_printf(seq, " Up %d\n", netif_running(dev));
792 seq_printf(seq, " Speed %u\n", yp->bitrate);
793 seq_printf(seq, " IoBase 0x%x\n", yp->iobase);
794 seq_printf(seq, " BaudRate %u\n", yp->baudrate);
795 seq_printf(seq, " IRQ %u\n", yp->irq);
796 seq_printf(seq, " TxState %u\n", yp->tx_state);
797 seq_printf(seq, " Duplex %u\n", yp->dupmode);
798 seq_printf(seq, " HoldDly %u\n", yp->holdd);
799 seq_printf(seq, " TxDelay %u\n", yp->txd);
800 seq_printf(seq, " TxTail %u\n", yp->txtail);
801 seq_printf(seq, " SlotTime %u\n", yp->slot);
802 seq_printf(seq, " Persist %u\n", yp->pers);
803 seq_printf(seq, " TxFrames %lu\n", yp->stats.tx_packets);
804 seq_printf(seq, " RxFrames %lu\n", yp->stats.rx_packets);
805 seq_printf(seq, " TxInt %u\n", yp->nb_mdint);
806 seq_printf(seq, " RxInt %u\n", yp->nb_rxint);
807 seq_printf(seq, " RxOver %lu\n", yp->stats.rx_fifo_errors);
808 seq_printf(seq, "\n");
809 return 0;
810 }
811
812 static struct seq_operations yam_seqops = {
813 .start = yam_seq_start,
814 .next = yam_seq_next,
815 .stop = yam_seq_stop,
816 .show = yam_seq_show,
817 };
818
819 static int yam_info_open(struct inode *inode, struct file *file)
820 {
821 return seq_open(file, &yam_seqops);
822 }
823
824 static struct file_operations yam_info_fops = {
825 .owner = THIS_MODULE,
826 .open = yam_info_open,
827 .read = seq_read,
828 .llseek = seq_lseek,
829 .release = seq_release,
830 };
831
832 #endif
833
834
835 /* --------------------------------------------------------------------- */
836
837 static struct net_device_stats *yam_get_stats(struct net_device *dev)
838 {
839 struct yam_port *yp;
840
841 if (!dev || !dev->priv)
842 return NULL;
843
844 yp = (struct yam_port *) dev->priv;
845 if (yp->magic != YAM_MAGIC)
846 return NULL;
847
848 /*
849 * Get the current statistics. This may be called with the
850 * card open or closed.
851 */
852 return &yp->stats;
853 }
854
855 /* --------------------------------------------------------------------- */
856
857 static int yam_open(struct net_device *dev)
858 {
859 struct yam_port *yp = (struct yam_port *) dev->priv;
860 enum uart u;
861 int i;
862 int ret=0;
863
864 printk(KERN_INFO "Trying %s at iobase 0x%lx irq %u\n", dev->name, dev->base_addr, dev->irq);
865
866 if (!dev || !yp || !yp->bitrate)
867 return -ENXIO;
868 if (!dev->base_addr || dev->base_addr > 0x1000 - YAM_EXTENT ||
869 dev->irq < 2 || dev->irq > 15) {
870 return -ENXIO;
871 }
872 if (!request_region(dev->base_addr, YAM_EXTENT, dev->name))
873 {
874 printk(KERN_ERR "%s: cannot 0x%lx busy\n", dev->name, dev->base_addr);
875 return -EACCES;
876 }
877 if ((u = yam_check_uart(dev->base_addr)) == c_uart_unknown) {
878 printk(KERN_ERR "%s: cannot find uart type\n", dev->name);
879 ret = -EIO;
880 goto out_release_base;
881 }
882 if (fpga_download(dev->base_addr, yp->bitrate)) {
883 printk(KERN_ERR "%s: cannot init FPGA\n", dev->name);
884 ret = -EIO;
885 goto out_release_base;
886 }
887 outb(0, IER(dev->base_addr));
888 if (request_irq(dev->irq, yam_interrupt, SA_INTERRUPT | SA_SHIRQ, dev->name, dev)) {
889 printk(KERN_ERR "%s: irq %d busy\n", dev->name, dev->irq);
890 ret = -EBUSY;
891 goto out_release_base;
892 }
893
894 yam_set_uart(dev);
895
896 netif_start_queue(dev);
897
898 yp->slotcnt = yp->slot / 10;
899
900 /* Reset overruns for all ports - FPGA programming makes overruns */
901 for (i = 0; i < NR_PORTS; i++) {
902 struct net_device *dev = yam_devs[i];
903 struct yam_port *yp = dev->priv;
904 inb(LSR(dev->base_addr));
905 yp->stats.rx_fifo_errors = 0;
906 }
907
908 printk(KERN_INFO "%s at iobase 0x%lx irq %u uart %s\n", dev->name, dev->base_addr, dev->irq,
909 uart_str[u]);
910 return 0;
911
912 out_release_base:
913 release_region(dev->base_addr, YAM_EXTENT);
914 return ret;
915 }
916
917 /* --------------------------------------------------------------------- */
918
919 static int yam_close(struct net_device *dev)
920 {
921 struct sk_buff *skb;
922 struct yam_port *yp = (struct yam_port *) dev->priv;
923
924 if (!dev || !yp)
925 return -EINVAL;
926 /*
927 * disable interrupts
928 */
929 outb(0, IER(dev->base_addr));
930 outb(1, MCR(dev->base_addr));
931 /* Remove IRQ handler if last */
932 free_irq(dev->irq,dev);
933 release_region(dev->base_addr, YAM_EXTENT);
934 netif_stop_queue(dev);
935 while ((skb = skb_dequeue(&yp->send_queue)))
936 dev_kfree_skb(skb);
937
938 printk(KERN_INFO "%s: close yam at iobase 0x%lx irq %u\n",
939 yam_drvname, dev->base_addr, dev->irq);
940 return 0;
941 }
942
943 /* --------------------------------------------------------------------- */
944
945 static int yam_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
946 {
947 struct yam_port *yp = (struct yam_port *) dev->priv;
948 struct yamdrv_ioctl_cfg yi;
949 struct yamdrv_ioctl_mcs *ym;
950 int ioctl_cmd;
951
952 if (copy_from_user(&ioctl_cmd, ifr->ifr_data, sizeof(int)))
953 return -EFAULT;
954
955 if (yp == NULL || yp->magic != YAM_MAGIC)
956 return -EINVAL;
957
958 if (!capable(CAP_NET_ADMIN))
959 return -EPERM;
960
961 if (cmd != SIOCDEVPRIVATE)
962 return -EINVAL;
963
964 switch (ioctl_cmd) {
965
966 case SIOCYAMRESERVED:
967 return -EINVAL; /* unused */
968
969 case SIOCYAMSMCS:
970 if (netif_running(dev))
971 return -EINVAL; /* Cannot change this parameter when up */
972 if ((ym = kmalloc(sizeof(struct yamdrv_ioctl_mcs), GFP_KERNEL)) == NULL)
973 return -ENOBUFS;
974 ym->bitrate = 9600;
975 if (copy_from_user(ym, ifr->ifr_data, sizeof(struct yamdrv_ioctl_mcs))) {
976 kfree(ym);
977 return -EFAULT;
978 }
979 if (ym->bitrate > YAM_MAXBITRATE) {
980 kfree(ym);
981 return -EINVAL;
982 }
983 add_mcs(ym->bits, ym->bitrate);
984 kfree(ym);
985 break;
986
987 case SIOCYAMSCFG:
988 if (!capable(CAP_SYS_RAWIO))
989 return -EPERM;
990 if (copy_from_user(&yi, ifr->ifr_data, sizeof(struct yamdrv_ioctl_cfg)))
991 return -EFAULT;
992
993 if ((yi.cfg.mask & YAM_IOBASE) && netif_running(dev))
994 return -EINVAL; /* Cannot change this parameter when up */
995 if ((yi.cfg.mask & YAM_IRQ) && netif_running(dev))
996 return -EINVAL; /* Cannot change this parameter when up */
997 if ((yi.cfg.mask & YAM_BITRATE) && netif_running(dev))
998 return -EINVAL; /* Cannot change this parameter when up */
999 if ((yi.cfg.mask & YAM_BAUDRATE) && netif_running(dev))
1000 return -EINVAL; /* Cannot change this parameter when up */
1001
1002 if (yi.cfg.mask & YAM_IOBASE) {
1003 yp->iobase = yi.cfg.iobase;
1004 dev->base_addr = yi.cfg.iobase;
1005 }
1006 if (yi.cfg.mask & YAM_IRQ) {
1007 if (yi.cfg.irq > 15)
1008 return -EINVAL;
1009 yp->irq = yi.cfg.irq;
1010 dev->irq = yi.cfg.irq;
1011 }
1012 if (yi.cfg.mask & YAM_BITRATE) {
1013 if (yi.cfg.bitrate > YAM_MAXBITRATE)
1014 return -EINVAL;
1015 yp->bitrate = yi.cfg.bitrate;
1016 }
1017 if (yi.cfg.mask & YAM_BAUDRATE) {
1018 if (yi.cfg.baudrate > YAM_MAXBAUDRATE)
1019 return -EINVAL;
1020 yp->baudrate = yi.cfg.baudrate;
1021 }
1022 if (yi.cfg.mask & YAM_MODE) {
1023 if (yi.cfg.mode > YAM_MAXMODE)
1024 return -EINVAL;
1025 yp->dupmode = yi.cfg.mode;
1026 }
1027 if (yi.cfg.mask & YAM_HOLDDLY) {
1028 if (yi.cfg.holddly > YAM_MAXHOLDDLY)
1029 return -EINVAL;
1030 yp->holdd = yi.cfg.holddly;
1031 }
1032 if (yi.cfg.mask & YAM_TXDELAY) {
1033 if (yi.cfg.txdelay > YAM_MAXTXDELAY)
1034 return -EINVAL;
1035 yp->txd = yi.cfg.txdelay;
1036 }
1037 if (yi.cfg.mask & YAM_TXTAIL) {
1038 if (yi.cfg.txtail > YAM_MAXTXTAIL)
1039 return -EINVAL;
1040 yp->txtail = yi.cfg.txtail;
1041 }
1042 if (yi.cfg.mask & YAM_PERSIST) {
1043 if (yi.cfg.persist > YAM_MAXPERSIST)
1044 return -EINVAL;
1045 yp->pers = yi.cfg.persist;
1046 }
1047 if (yi.cfg.mask & YAM_SLOTTIME) {
1048 if (yi.cfg.slottime > YAM_MAXSLOTTIME)
1049 return -EINVAL;
1050 yp->slot = yi.cfg.slottime;
1051 yp->slotcnt = yp->slot / 10;
1052 }
1053 break;
1054
1055 case SIOCYAMGCFG:
1056 yi.cfg.mask = 0xffffffff;
1057 yi.cfg.iobase = yp->iobase;
1058 yi.cfg.irq = yp->irq;
1059 yi.cfg.bitrate = yp->bitrate;
1060 yi.cfg.baudrate = yp->baudrate;
1061 yi.cfg.mode = yp->dupmode;
1062 yi.cfg.txdelay = yp->txd;
1063 yi.cfg.holddly = yp->holdd;
1064 yi.cfg.txtail = yp->txtail;
1065 yi.cfg.persist = yp->pers;
1066 yi.cfg.slottime = yp->slot;
1067 if (copy_to_user(ifr->ifr_data, &yi, sizeof(struct yamdrv_ioctl_cfg)))
1068 return -EFAULT;
1069 break;
1070
1071 default:
1072 return -EINVAL;
1073
1074 }
1075
1076 return 0;
1077 }
1078
1079 /* --------------------------------------------------------------------- */
1080
1081 static int yam_set_mac_address(struct net_device *dev, void *addr)
1082 {
1083 struct sockaddr *sa = (struct sockaddr *) addr;
1084
1085 /* addr is an AX.25 shifted ASCII mac address */
1086 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
1087 return 0;
1088 }
1089
1090 /* --------------------------------------------------------------------- */
1091
1092 static void yam_setup(struct net_device *dev)
1093 {
1094 struct yam_port *yp = dev->priv;
1095
1096 yp->magic = YAM_MAGIC;
1097 yp->bitrate = DEFAULT_BITRATE;
1098 yp->baudrate = DEFAULT_BITRATE * 2;
1099 yp->iobase = 0;
1100 yp->irq = 0;
1101 yp->dupmode = 0;
1102 yp->holdd = DEFAULT_HOLDD;
1103 yp->txd = DEFAULT_TXD;
1104 yp->txtail = DEFAULT_TXTAIL;
1105 yp->slot = DEFAULT_SLOT;
1106 yp->pers = DEFAULT_PERS;
1107 yp->dev = dev;
1108
1109 dev->base_addr = yp->iobase;
1110 dev->irq = yp->irq;
1111 SET_MODULE_OWNER(dev);
1112
1113 dev->open = yam_open;
1114 dev->stop = yam_close;
1115 dev->do_ioctl = yam_ioctl;
1116 dev->hard_start_xmit = yam_send_packet;
1117 dev->get_stats = yam_get_stats;
1118
1119 skb_queue_head_init(&yp->send_queue);
1120
1121 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
1122 dev->hard_header = ax25_encapsulate;
1123 dev->rebuild_header = ax25_rebuild_header;
1124 #else /* CONFIG_AX25 || CONFIG_AX25_MODULE */
1125 dev->hard_header = NULL;
1126 dev->rebuild_header = NULL;
1127 #endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
1128
1129 dev->set_mac_address = yam_set_mac_address;
1130
1131 dev->type = ARPHRD_AX25; /* AF_AX25 device */
1132 dev->hard_header_len = 73; /* We do digipeaters now */
1133 dev->mtu = 256; /* AX25 is the default */
1134 dev->addr_len = 7; /* sizeof an ax.25 address */
1135 memcpy(dev->broadcast, ax25_bcast, 7);
1136 memcpy(dev->dev_addr, ax25_test, 7);
1137
1138 }
1139
1140 static int __init yam_init_driver(void)
1141 {
1142 struct net_device *dev;
1143 int i, err;
1144 char name[IFNAMSIZ];
1145
1146 printk(yam_drvinfo);
1147
1148 for (i = 0; i < NR_PORTS; i++) {
1149 sprintf(name, "yam%d", i);
1150
1151 dev = alloc_netdev(sizeof(struct yam_port), name,
1152 yam_setup);
1153 if (!dev) {
1154 printk(KERN_ERR "yam: cannot allocate net device %s\n",
1155 dev->name);
1156 err = -ENOMEM;
1157 goto error;
1158 }
1159
1160 err = register_netdev(dev);
1161 if (err) {
1162 printk(KERN_WARNING "yam: cannot register net device %s\n", dev->name);
1163 goto error;
1164 }
1165 yam_devs[i] = dev;
1166
1167 }
1168
1169 yam_timer.function = yam_dotimer;
1170 yam_timer.expires = jiffies + HZ / 100;
1171 add_timer(&yam_timer);
1172
1173 proc_net_fops_create("yam", S_IRUGO, &yam_info_fops);
1174 return 0;
1175 error:
1176 while (--i >= 0) {
1177 unregister_netdev(yam_devs[i]);
1178 free_netdev(yam_devs[i]);
1179 }
1180 return err;
1181 }
1182
1183 /* --------------------------------------------------------------------- */
1184
1185 static void __exit yam_cleanup_driver(void)
1186 {
1187 struct yam_mcs *p;
1188 int i;
1189
1190 del_timer(&yam_timer);
1191 for (i = 0; i < NR_PORTS; i++) {
1192 struct net_device *dev = yam_devs[i];
1193 if (dev) {
1194 unregister_netdev(dev);
1195 free_netdev(dev);
1196 }
1197 }
1198
1199 while (yam_data) {
1200 p = yam_data;
1201 yam_data = yam_data->next;
1202 kfree(p);
1203 }
1204
1205 proc_net_remove("yam");
1206 }
1207
1208 /* --------------------------------------------------------------------- */
1209
1210 MODULE_AUTHOR("Frederic Rible F1OAT frible@teaser.fr");
1211 MODULE_DESCRIPTION("Yam amateur radio modem driver");
1212 MODULE_LICENSE("GPL");
1213
1214 module_init(yam_init_driver);
1215 module_exit(yam_cleanup_driver);
1216
1217 /* --------------------------------------------------------------------- */
1218
MOXA 2.6.9 from sdlinux-moxaart.tgz