summaryrefslogtreecommitdiff
path: root/drivers/isdn/hisax/st5481_b.c
blob: 0a2536d6240297e77ebaa76a7f82c1766c492f59 (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
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
/*
 * Driver for ST5481 USB ISDN modem
 *
 * Author       Frode Isaksen
 * Copyright    2001 by Frode Isaksen      <fisaksen@bewan.com>
 *              2001 by Kai Germaschewski  <kai.germaschewski@gmx.de>
 * 
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#include <linux/init.h>
#include <linux/usb.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include "st5481.h"

static inline void B_L1L2(struct st5481_bcs *bcs, int pr, void *arg)
{
	struct hisax_if *ifc = (struct hisax_if *) &bcs->b_if;

	ifc->l1l2(ifc, pr, arg);
}

/*
 * Encode and transmit next frame.
 */
static void usb_b_out(struct st5481_bcs *bcs,int buf_nr)
{
	struct st5481_b_out *b_out = &bcs->b_out;
	struct st5481_adapter *adapter = bcs->adapter;
	struct urb *urb;
	unsigned int packet_size,offset;
	int len,buf_size,bytes_sent;
	int i;
	struct sk_buff *skb;
	
	if (test_and_set_bit(buf_nr, &b_out->busy)) {
		DBG(4,"ep %d urb %d busy",(bcs->channel+1)*2,buf_nr);
		return;
	}
	urb = b_out->urb[buf_nr];

	// Adjust isoc buffer size according to flow state
	if(b_out->flow_event & (OUT_DOWN | OUT_UNDERRUN)) {
		buf_size = NUM_ISO_PACKETS_B*SIZE_ISO_PACKETS_B_OUT + B_FLOW_ADJUST;
		packet_size = SIZE_ISO_PACKETS_B_OUT + B_FLOW_ADJUST;
		DBG(4,"B%d,adjust flow,add %d bytes",bcs->channel+1,B_FLOW_ADJUST);
	} else if(b_out->flow_event & OUT_UP){
		buf_size = NUM_ISO_PACKETS_B*SIZE_ISO_PACKETS_B_OUT - B_FLOW_ADJUST;
		packet_size = SIZE_ISO_PACKETS_B_OUT - B_FLOW_ADJUST;
		DBG(4,"B%d,adjust flow,remove %d bytes",bcs->channel+1,B_FLOW_ADJUST);
	} else {
		buf_size = NUM_ISO_PACKETS_B*SIZE_ISO_PACKETS_B_OUT;
		packet_size = 8;
	}
	b_out->flow_event = 0;

	len = 0;
	while (len < buf_size) {
		if ((skb = b_out->tx_skb)) {
			DBG_SKB(0x100, skb);
			DBG(4,"B%d,len=%d",bcs->channel+1,skb->len);
			
			if (bcs->mode == L1_MODE_TRANS) {	
				bytes_sent = buf_size - len;
				if (skb->len < bytes_sent)
					bytes_sent = skb->len;
				{	/* swap tx bytes to get hearable audio data */
					register unsigned char *src  = skb->data;
					register unsigned char *dest = urb->transfer_buffer+len;
					register unsigned int count;
					for (count = 0; count < bytes_sent; count++)
						*dest++ = isdnhdlc_bit_rev_tab[*src++];
				}
				len += bytes_sent;
			} else {
				len += isdnhdlc_encode(&b_out->hdlc_state,
						       skb->data, skb->len, &bytes_sent,
						       urb->transfer_buffer+len, buf_size-len);
			}

			skb_pull(skb, bytes_sent);

			if (!skb->len) {
				// Frame sent
				b_out->tx_skb = NULL;
				B_L1L2(bcs, PH_DATA | CONFIRM, (void *) skb->truesize);
				dev_kfree_skb_any(skb);

/* 				if (!(bcs->tx_skb = skb_dequeue(&bcs->sq))) { */
/* 					st5481B_sched_event(bcs, B_XMTBUFREADY); */
/* 				} */
			}
		} else {
			if (bcs->mode == L1_MODE_TRANS) {
				memset(urb->transfer_buffer+len, 0xff, buf_size-len);
				len = buf_size;
			} else {
				// Send flags
				len += isdnhdlc_encode(&b_out->hdlc_state,
						       NULL, 0, &bytes_sent,
						       urb->transfer_buffer+len, buf_size-len);
			}
		}	
	}

	// Prepare the URB
	for (i = 0, offset = 0; offset < len; i++) {
		urb->iso_frame_desc[i].offset = offset;
		urb->iso_frame_desc[i].length = packet_size;
		offset += packet_size;
		packet_size = SIZE_ISO_PACKETS_B_OUT;
	}
	urb->transfer_buffer_length = len;
	urb->number_of_packets = i;
	urb->dev = adapter->usb_dev;

	DBG_ISO_PACKET(0x200,urb);

	SUBMIT_URB(urb, GFP_NOIO);
}

/*
 * Start transfering (flags or data) on the B channel, since
 * FIFO counters has been set to a non-zero value.
 */
static void st5481B_start_xfer(void *context)
{
	struct st5481_bcs *bcs = context;

	DBG(4,"B%d",bcs->channel+1);

	// Start transmitting (flags or data) on B channel

	usb_b_out(bcs,0);
	usb_b_out(bcs,1);
}

/*
 * If the adapter has only 2 LEDs, the green
 * LED will blink with a rate depending
 * on the number of channels opened.
 */
static void led_blink(struct st5481_adapter *adapter)
{
	u_char leds = adapter->leds;

	// 50 frames/sec for each channel
	if (++adapter->led_counter % 50) {
		return;
	}

	if (adapter->led_counter % 100) {
		leds |= GREEN_LED;
	} else {
		leds &= ~GREEN_LED;
	}
	
	st5481_usb_device_ctrl_msg(adapter, GPIO_OUT, leds, NULL, NULL);
}

static void usb_b_out_complete(struct urb *urb, struct pt_regs *regs)
{
	struct st5481_bcs *bcs = urb->context;
	struct st5481_b_out *b_out = &bcs->b_out;
	struct st5481_adapter *adapter = bcs->adapter;
	int buf_nr;
	
	buf_nr = get_buf_nr(b_out->urb, urb);
	test_and_clear_bit(buf_nr, &b_out->busy);

	if (unlikely(urb->status < 0)) {
		switch (urb->status) {
			case -ENOENT:
			case -ESHUTDOWN:
			case -ECONNRESET:
				DBG(4,"urb killed status %d", urb->status);
				return; // Give up
			default: 
				WARN("urb status %d",urb->status);
				if (b_out->busy == 0) {
					st5481_usb_pipe_reset(adapter, (bcs->channel+1)*2 | USB_DIR_OUT, NULL, NULL);
				}
				break;
		}
	}

	usb_b_out(bcs,buf_nr);

	if (adapter->number_of_leds == 2)
		led_blink(adapter);
}

/*
 * Start or stop the transfer on the B channel.
 */
static void st5481B_mode(struct st5481_bcs *bcs, int mode)
{
	struct st5481_b_out *b_out = &bcs->b_out;
	struct st5481_adapter *adapter = bcs->adapter;

	DBG(4,"B%d,mode=%d", bcs->channel + 1, mode);

	if (bcs->mode == mode)
		return;

	bcs->mode = mode;

	// Cancel all USB transfers on this B channel
	b_out->urb[0]->transfer_flags |= URB_ASYNC_UNLINK;
	usb_unlink_urb(b_out->urb[0]);
	b_out->urb[1]->transfer_flags |= URB_ASYNC_UNLINK;
	usb_unlink_urb(b_out->urb[1]);
	b_out->busy = 0;

	st5481_in_mode(&bcs->b_in, mode);
	if (bcs->mode != L1_MODE_NULL) {
		// Open the B channel
		if (bcs->mode != L1_MODE_TRANS) {
			isdnhdlc_out_init(&b_out->hdlc_state, 0, bcs->mode == L1_MODE_HDLC_56K);
		}
		st5481_usb_pipe_reset(adapter, (bcs->channel+1)*2, NULL, NULL);
	
		// Enable B channel interrupts
		st5481_usb_device_ctrl_msg(adapter, FFMSK_B1+(bcs->channel*2), 
				    OUT_UP+OUT_DOWN+OUT_UNDERRUN, NULL, NULL);

		// Enable B channel FIFOs
		st5481_usb_device_ctrl_msg(adapter, OUT_B1_COUNTER+(bcs->channel*2), 32, st5481B_start_xfer, bcs);
		if (adapter->number_of_leds == 4) {
			if (bcs->channel == 0) {
				adapter->leds |= B1_LED;
			} else {
				adapter->leds |= B2_LED;
			}
		}
	} else {
		// Disble B channel interrupts
		st5481_usb_device_ctrl_msg(adapter, FFMSK_B1+(bcs->channel*2), 0, NULL, NULL);

		// Disable B channel FIFOs
		st5481_usb_device_ctrl_msg(adapter, OUT_B1_COUNTER+(bcs->channel*2), 0, NULL, NULL);

		if (adapter->number_of_leds == 4) {
			if (bcs->channel == 0) {
				adapter->leds &= ~B1_LED;
			} else {
				adapter->leds &= ~B2_LED;
			}
		} else {
			st5481_usb_device_ctrl_msg(adapter, GPIO_OUT, adapter->leds, NULL, NULL);
		}
		if (b_out->tx_skb) {
			dev_kfree_skb_any(b_out->tx_skb);
			b_out->tx_skb = NULL;
		}
		
	}
}

static int st5481_setup_b_out(struct st5481_bcs *bcs)
{
	struct usb_device *dev = bcs->adapter->usb_dev;
	struct usb_interface *intf;
	struct usb_host_interface *altsetting = NULL;
	struct usb_host_endpoint *endpoint;
  	struct st5481_b_out *b_out = &bcs->b_out;

	DBG(4,"");

	intf = usb_ifnum_to_if(dev, 0);
	if (intf)
		altsetting = usb_altnum_to_altsetting(intf, 3);
	if (!altsetting)
		return -ENXIO;

	// Allocate URBs and buffers for the B channel out
	endpoint = &altsetting->endpoint[EP_B1_OUT - 1 + bcs->channel * 2];

	DBG(4,"endpoint address=%02x,packet size=%d",
	    endpoint->desc.bEndpointAddress, le16_to_cpu(endpoint->desc.wMaxPacketSize));

	// Allocate memory for 8000bytes/sec + extra bytes if underrun
	return st5481_setup_isocpipes(b_out->urb, dev, 
				      usb_sndisocpipe(dev, endpoint->desc.bEndpointAddress),
				      NUM_ISO_PACKETS_B, SIZE_ISO_PACKETS_B_OUT,
				      NUM_ISO_PACKETS_B * SIZE_ISO_PACKETS_B_OUT + B_FLOW_ADJUST,
				      usb_b_out_complete, bcs);
}

static void st5481_release_b_out(struct st5481_bcs *bcs)
{
	struct st5481_b_out *b_out = &bcs->b_out;

	DBG(4,"");

	st5481_release_isocpipes(b_out->urb);
}

int st5481_setup_b(struct st5481_bcs *bcs)
{
	int retval;

	DBG(4,"");

	retval = st5481_setup_b_out(bcs);
	if (retval)
		goto err;
	bcs->b_in.bufsize = HSCX_BUFMAX;
	bcs->b_in.num_packets = NUM_ISO_PACKETS_B;
	bcs->b_in.packet_size = SIZE_ISO_PACKETS_B_IN;
	bcs->b_in.ep = (bcs->channel ? EP_B2_IN : EP_B1_IN) | USB_DIR_IN;
	bcs->b_in.counter = bcs->channel ? IN_B2_COUNTER : IN_B1_COUNTER;
	bcs->b_in.adapter = bcs->adapter;
	bcs->b_in.hisax_if = &bcs->b_if.ifc;
	retval = st5481_setup_in(&bcs->b_in);
	if (retval)
		goto err_b_out;


	return 0;

 err_b_out:
	st5481_release_b_out(bcs);
 err:
	return retval;
}

/*
 * Release buffers and URBs for the B channels
 */
void st5481_release_b(struct st5481_bcs *bcs)
{
	DBG(4,"");

	st5481_release_in(&bcs->b_in);
	st5481_release_b_out(bcs);
}

/*
 * st5481_b_l2l1 is the entry point for upper layer routines that want to
 * transmit on the B channel.  PH_DATA | REQUEST is a normal packet that
 * we either start transmitting (if idle) or queue (if busy).
 * PH_PULL | REQUEST can be called to request a callback message
 * (PH_PULL | CONFIRM)
 * once the link is idle.  After a "pull" callback, the upper layer
 * routines can use PH_PULL | INDICATION to send data.
 */
void st5481_b_l2l1(struct hisax_if *ifc, int pr, void *arg)
{
	struct st5481_bcs *bcs = ifc->priv;
	struct sk_buff *skb = arg;
	int mode;

	DBG(4, "");

	switch (pr) {
	case PH_DATA | REQUEST:
		if (bcs->b_out.tx_skb)
			BUG();
		
		bcs->b_out.tx_skb = skb;
		break;
	case PH_ACTIVATE | REQUEST:
		mode = (int) arg;
		DBG(4,"B%d,PH_ACTIVATE_REQUEST %d", bcs->channel + 1, mode);
		st5481B_mode(bcs, mode);
		B_L1L2(bcs, PH_ACTIVATE | INDICATION, NULL);
		break;
	case PH_DEACTIVATE | REQUEST:
		DBG(4,"B%d,PH_DEACTIVATE_REQUEST", bcs->channel + 1);
		st5481B_mode(bcs, L1_MODE_NULL);
		B_L1L2(bcs, PH_DEACTIVATE | INDICATION, NULL);
		break;
	default:
		WARN("pr %#x\n", pr);
	}
}