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1da177e4 LT |
1 | /* |
2 | * Driver for ST5481 USB ISDN modem | |
3 | * | |
4 | * Author Frode Isaksen | |
5 | * Copyright 2001 by Frode Isaksen <fisaksen@bewan.com> | |
6 | * 2001 by Kai Germaschewski <kai.germaschewski@gmx.de> | |
7 | * | |
8 | * This software may be used and distributed according to the terms | |
9 | * of the GNU General Public License, incorporated herein by reference. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/init.h> | |
5a0e3ad6 | 14 | #include <linux/gfp.h> |
1da177e4 | 15 | #include <linux/usb.h> |
1da177e4 | 16 | #include <linux/netdevice.h> |
60e657e3 | 17 | #include <linux/bitrev.h> |
1da177e4 LT |
18 | #include "st5481.h" |
19 | ||
20 | static inline void B_L1L2(struct st5481_bcs *bcs, int pr, void *arg) | |
21 | { | |
22 | struct hisax_if *ifc = (struct hisax_if *) &bcs->b_if; | |
23 | ||
24 | ifc->l1l2(ifc, pr, arg); | |
25 | } | |
26 | ||
27 | /* | |
28 | * Encode and transmit next frame. | |
29 | */ | |
30 | static void usb_b_out(struct st5481_bcs *bcs,int buf_nr) | |
31 | { | |
32 | struct st5481_b_out *b_out = &bcs->b_out; | |
33 | struct st5481_adapter *adapter = bcs->adapter; | |
34 | struct urb *urb; | |
35 | unsigned int packet_size,offset; | |
36 | int len,buf_size,bytes_sent; | |
37 | int i; | |
38 | struct sk_buff *skb; | |
39 | ||
40 | if (test_and_set_bit(buf_nr, &b_out->busy)) { | |
41 | DBG(4,"ep %d urb %d busy",(bcs->channel+1)*2,buf_nr); | |
42 | return; | |
43 | } | |
44 | urb = b_out->urb[buf_nr]; | |
45 | ||
46 | // Adjust isoc buffer size according to flow state | |
47 | if(b_out->flow_event & (OUT_DOWN | OUT_UNDERRUN)) { | |
48 | buf_size = NUM_ISO_PACKETS_B*SIZE_ISO_PACKETS_B_OUT + B_FLOW_ADJUST; | |
49 | packet_size = SIZE_ISO_PACKETS_B_OUT + B_FLOW_ADJUST; | |
50 | DBG(4,"B%d,adjust flow,add %d bytes",bcs->channel+1,B_FLOW_ADJUST); | |
51 | } else if(b_out->flow_event & OUT_UP){ | |
52 | buf_size = NUM_ISO_PACKETS_B*SIZE_ISO_PACKETS_B_OUT - B_FLOW_ADJUST; | |
53 | packet_size = SIZE_ISO_PACKETS_B_OUT - B_FLOW_ADJUST; | |
54 | DBG(4,"B%d,adjust flow,remove %d bytes",bcs->channel+1,B_FLOW_ADJUST); | |
55 | } else { | |
56 | buf_size = NUM_ISO_PACKETS_B*SIZE_ISO_PACKETS_B_OUT; | |
57 | packet_size = 8; | |
58 | } | |
59 | b_out->flow_event = 0; | |
60 | ||
61 | len = 0; | |
62 | while (len < buf_size) { | |
63 | if ((skb = b_out->tx_skb)) { | |
64 | DBG_SKB(0x100, skb); | |
65 | DBG(4,"B%d,len=%d",bcs->channel+1,skb->len); | |
66 | ||
67 | if (bcs->mode == L1_MODE_TRANS) { | |
68 | bytes_sent = buf_size - len; | |
69 | if (skb->len < bytes_sent) | |
70 | bytes_sent = skb->len; | |
71 | { /* swap tx bytes to get hearable audio data */ | |
72 | register unsigned char *src = skb->data; | |
73 | register unsigned char *dest = urb->transfer_buffer+len; | |
74 | register unsigned int count; | |
75 | for (count = 0; count < bytes_sent; count++) | |
60e657e3 | 76 | *dest++ = bitrev8(*src++); |
1da177e4 LT |
77 | } |
78 | len += bytes_sent; | |
79 | } else { | |
80 | len += isdnhdlc_encode(&b_out->hdlc_state, | |
81 | skb->data, skb->len, &bytes_sent, | |
82 | urb->transfer_buffer+len, buf_size-len); | |
83 | } | |
84 | ||
85 | skb_pull(skb, bytes_sent); | |
86 | ||
87 | if (!skb->len) { | |
88 | // Frame sent | |
89 | b_out->tx_skb = NULL; | |
17a4506d | 90 | B_L1L2(bcs, PH_DATA | CONFIRM, (void *)(unsigned long) skb->truesize); |
1da177e4 LT |
91 | dev_kfree_skb_any(skb); |
92 | ||
93 | /* if (!(bcs->tx_skb = skb_dequeue(&bcs->sq))) { */ | |
94 | /* st5481B_sched_event(bcs, B_XMTBUFREADY); */ | |
95 | /* } */ | |
96 | } | |
97 | } else { | |
98 | if (bcs->mode == L1_MODE_TRANS) { | |
99 | memset(urb->transfer_buffer+len, 0xff, buf_size-len); | |
100 | len = buf_size; | |
101 | } else { | |
102 | // Send flags | |
103 | len += isdnhdlc_encode(&b_out->hdlc_state, | |
104 | NULL, 0, &bytes_sent, | |
105 | urb->transfer_buffer+len, buf_size-len); | |
106 | } | |
107 | } | |
108 | } | |
109 | ||
110 | // Prepare the URB | |
111 | for (i = 0, offset = 0; offset < len; i++) { | |
112 | urb->iso_frame_desc[i].offset = offset; | |
113 | urb->iso_frame_desc[i].length = packet_size; | |
114 | offset += packet_size; | |
115 | packet_size = SIZE_ISO_PACKETS_B_OUT; | |
116 | } | |
117 | urb->transfer_buffer_length = len; | |
118 | urb->number_of_packets = i; | |
119 | urb->dev = adapter->usb_dev; | |
120 | ||
121 | DBG_ISO_PACKET(0x200,urb); | |
122 | ||
123 | SUBMIT_URB(urb, GFP_NOIO); | |
124 | } | |
125 | ||
126 | /* | |
25985edc | 127 | * Start transferring (flags or data) on the B channel, since |
1da177e4 LT |
128 | * FIFO counters has been set to a non-zero value. |
129 | */ | |
130 | static void st5481B_start_xfer(void *context) | |
131 | { | |
132 | struct st5481_bcs *bcs = context; | |
133 | ||
134 | DBG(4,"B%d",bcs->channel+1); | |
135 | ||
136 | // Start transmitting (flags or data) on B channel | |
137 | ||
138 | usb_b_out(bcs,0); | |
139 | usb_b_out(bcs,1); | |
140 | } | |
141 | ||
142 | /* | |
143 | * If the adapter has only 2 LEDs, the green | |
144 | * LED will blink with a rate depending | |
145 | * on the number of channels opened. | |
146 | */ | |
147 | static void led_blink(struct st5481_adapter *adapter) | |
148 | { | |
149 | u_char leds = adapter->leds; | |
150 | ||
151 | // 50 frames/sec for each channel | |
152 | if (++adapter->led_counter % 50) { | |
153 | return; | |
154 | } | |
155 | ||
156 | if (adapter->led_counter % 100) { | |
157 | leds |= GREEN_LED; | |
158 | } else { | |
159 | leds &= ~GREEN_LED; | |
160 | } | |
161 | ||
162 | st5481_usb_device_ctrl_msg(adapter, GPIO_OUT, leds, NULL, NULL); | |
163 | } | |
164 | ||
7d12e780 | 165 | static void usb_b_out_complete(struct urb *urb) |
1da177e4 LT |
166 | { |
167 | struct st5481_bcs *bcs = urb->context; | |
168 | struct st5481_b_out *b_out = &bcs->b_out; | |
169 | struct st5481_adapter *adapter = bcs->adapter; | |
170 | int buf_nr; | |
171 | ||
172 | buf_nr = get_buf_nr(b_out->urb, urb); | |
173 | test_and_clear_bit(buf_nr, &b_out->busy); | |
174 | ||
175 | if (unlikely(urb->status < 0)) { | |
61ffcafa KK |
176 | switch (urb->status) { |
177 | case -ENOENT: | |
178 | case -ESHUTDOWN: | |
179 | case -ECONNRESET: | |
180 | DBG(4,"urb killed status %d", urb->status); | |
181 | return; // Give up | |
182 | default: | |
b6c63937 | 183 | WARNING("urb status %d",urb->status); |
61ffcafa KK |
184 | if (b_out->busy == 0) { |
185 | st5481_usb_pipe_reset(adapter, (bcs->channel+1)*2 | USB_DIR_OUT, NULL, NULL); | |
186 | } | |
187 | break; | |
1da177e4 LT |
188 | } |
189 | } | |
190 | ||
191 | usb_b_out(bcs,buf_nr); | |
192 | ||
193 | if (adapter->number_of_leds == 2) | |
194 | led_blink(adapter); | |
195 | } | |
196 | ||
197 | /* | |
198 | * Start or stop the transfer on the B channel. | |
199 | */ | |
200 | static void st5481B_mode(struct st5481_bcs *bcs, int mode) | |
201 | { | |
202 | struct st5481_b_out *b_out = &bcs->b_out; | |
203 | struct st5481_adapter *adapter = bcs->adapter; | |
204 | ||
205 | DBG(4,"B%d,mode=%d", bcs->channel + 1, mode); | |
206 | ||
207 | if (bcs->mode == mode) | |
208 | return; | |
209 | ||
210 | bcs->mode = mode; | |
211 | ||
212 | // Cancel all USB transfers on this B channel | |
213 | usb_unlink_urb(b_out->urb[0]); | |
214 | usb_unlink_urb(b_out->urb[1]); | |
215 | b_out->busy = 0; | |
216 | ||
217 | st5481_in_mode(&bcs->b_in, mode); | |
218 | if (bcs->mode != L1_MODE_NULL) { | |
219 | // Open the B channel | |
220 | if (bcs->mode != L1_MODE_TRANS) { | |
c38fc3bc KK |
221 | u32 features = HDLC_BITREVERSE; |
222 | if (bcs->mode == L1_MODE_HDLC_56K) | |
223 | features |= HDLC_56KBIT; | |
224 | isdnhdlc_out_init(&b_out->hdlc_state, features); | |
1da177e4 LT |
225 | } |
226 | st5481_usb_pipe_reset(adapter, (bcs->channel+1)*2, NULL, NULL); | |
227 | ||
228 | // Enable B channel interrupts | |
229 | st5481_usb_device_ctrl_msg(adapter, FFMSK_B1+(bcs->channel*2), | |
230 | OUT_UP+OUT_DOWN+OUT_UNDERRUN, NULL, NULL); | |
231 | ||
232 | // Enable B channel FIFOs | |
233 | st5481_usb_device_ctrl_msg(adapter, OUT_B1_COUNTER+(bcs->channel*2), 32, st5481B_start_xfer, bcs); | |
234 | if (adapter->number_of_leds == 4) { | |
235 | if (bcs->channel == 0) { | |
236 | adapter->leds |= B1_LED; | |
237 | } else { | |
238 | adapter->leds |= B2_LED; | |
239 | } | |
240 | } | |
241 | } else { | |
242 | // Disble B channel interrupts | |
243 | st5481_usb_device_ctrl_msg(adapter, FFMSK_B1+(bcs->channel*2), 0, NULL, NULL); | |
244 | ||
245 | // Disable B channel FIFOs | |
246 | st5481_usb_device_ctrl_msg(adapter, OUT_B1_COUNTER+(bcs->channel*2), 0, NULL, NULL); | |
247 | ||
248 | if (adapter->number_of_leds == 4) { | |
249 | if (bcs->channel == 0) { | |
250 | adapter->leds &= ~B1_LED; | |
251 | } else { | |
252 | adapter->leds &= ~B2_LED; | |
253 | } | |
254 | } else { | |
255 | st5481_usb_device_ctrl_msg(adapter, GPIO_OUT, adapter->leds, NULL, NULL); | |
256 | } | |
257 | if (b_out->tx_skb) { | |
258 | dev_kfree_skb_any(b_out->tx_skb); | |
259 | b_out->tx_skb = NULL; | |
260 | } | |
261 | ||
262 | } | |
263 | } | |
264 | ||
265 | static int st5481_setup_b_out(struct st5481_bcs *bcs) | |
266 | { | |
267 | struct usb_device *dev = bcs->adapter->usb_dev; | |
268 | struct usb_interface *intf; | |
269 | struct usb_host_interface *altsetting = NULL; | |
270 | struct usb_host_endpoint *endpoint; | |
271 | struct st5481_b_out *b_out = &bcs->b_out; | |
272 | ||
273 | DBG(4,""); | |
274 | ||
275 | intf = usb_ifnum_to_if(dev, 0); | |
276 | if (intf) | |
277 | altsetting = usb_altnum_to_altsetting(intf, 3); | |
278 | if (!altsetting) | |
279 | return -ENXIO; | |
280 | ||
281 | // Allocate URBs and buffers for the B channel out | |
282 | endpoint = &altsetting->endpoint[EP_B1_OUT - 1 + bcs->channel * 2]; | |
283 | ||
284 | DBG(4,"endpoint address=%02x,packet size=%d", | |
285 | endpoint->desc.bEndpointAddress, le16_to_cpu(endpoint->desc.wMaxPacketSize)); | |
286 | ||
287 | // Allocate memory for 8000bytes/sec + extra bytes if underrun | |
288 | return st5481_setup_isocpipes(b_out->urb, dev, | |
289 | usb_sndisocpipe(dev, endpoint->desc.bEndpointAddress), | |
290 | NUM_ISO_PACKETS_B, SIZE_ISO_PACKETS_B_OUT, | |
291 | NUM_ISO_PACKETS_B * SIZE_ISO_PACKETS_B_OUT + B_FLOW_ADJUST, | |
292 | usb_b_out_complete, bcs); | |
293 | } | |
294 | ||
295 | static void st5481_release_b_out(struct st5481_bcs *bcs) | |
296 | { | |
297 | struct st5481_b_out *b_out = &bcs->b_out; | |
298 | ||
299 | DBG(4,""); | |
300 | ||
301 | st5481_release_isocpipes(b_out->urb); | |
302 | } | |
303 | ||
304 | int st5481_setup_b(struct st5481_bcs *bcs) | |
305 | { | |
306 | int retval; | |
307 | ||
308 | DBG(4,""); | |
309 | ||
310 | retval = st5481_setup_b_out(bcs); | |
311 | if (retval) | |
312 | goto err; | |
313 | bcs->b_in.bufsize = HSCX_BUFMAX; | |
314 | bcs->b_in.num_packets = NUM_ISO_PACKETS_B; | |
315 | bcs->b_in.packet_size = SIZE_ISO_PACKETS_B_IN; | |
316 | bcs->b_in.ep = (bcs->channel ? EP_B2_IN : EP_B1_IN) | USB_DIR_IN; | |
317 | bcs->b_in.counter = bcs->channel ? IN_B2_COUNTER : IN_B1_COUNTER; | |
318 | bcs->b_in.adapter = bcs->adapter; | |
319 | bcs->b_in.hisax_if = &bcs->b_if.ifc; | |
320 | retval = st5481_setup_in(&bcs->b_in); | |
321 | if (retval) | |
322 | goto err_b_out; | |
323 | ||
324 | ||
325 | return 0; | |
326 | ||
327 | err_b_out: | |
328 | st5481_release_b_out(bcs); | |
329 | err: | |
330 | return retval; | |
331 | } | |
332 | ||
333 | /* | |
334 | * Release buffers and URBs for the B channels | |
335 | */ | |
336 | void st5481_release_b(struct st5481_bcs *bcs) | |
337 | { | |
338 | DBG(4,""); | |
339 | ||
340 | st5481_release_in(&bcs->b_in); | |
341 | st5481_release_b_out(bcs); | |
342 | } | |
343 | ||
344 | /* | |
345 | * st5481_b_l2l1 is the entry point for upper layer routines that want to | |
346 | * transmit on the B channel. PH_DATA | REQUEST is a normal packet that | |
347 | * we either start transmitting (if idle) or queue (if busy). | |
348 | * PH_PULL | REQUEST can be called to request a callback message | |
349 | * (PH_PULL | CONFIRM) | |
350 | * once the link is idle. After a "pull" callback, the upper layer | |
351 | * routines can use PH_PULL | INDICATION to send data. | |
352 | */ | |
353 | void st5481_b_l2l1(struct hisax_if *ifc, int pr, void *arg) | |
354 | { | |
355 | struct st5481_bcs *bcs = ifc->priv; | |
356 | struct sk_buff *skb = arg; | |
17a4506d | 357 | long mode; |
1da177e4 LT |
358 | |
359 | DBG(4, ""); | |
360 | ||
361 | switch (pr) { | |
362 | case PH_DATA | REQUEST: | |
6dd44a74 | 363 | BUG_ON(bcs->b_out.tx_skb); |
1da177e4 LT |
364 | bcs->b_out.tx_skb = skb; |
365 | break; | |
366 | case PH_ACTIVATE | REQUEST: | |
17a4506d AC |
367 | mode = (long) arg; |
368 | DBG(4,"B%d,PH_ACTIVATE_REQUEST %ld", bcs->channel + 1, mode); | |
1da177e4 LT |
369 | st5481B_mode(bcs, mode); |
370 | B_L1L2(bcs, PH_ACTIVATE | INDICATION, NULL); | |
371 | break; | |
372 | case PH_DEACTIVATE | REQUEST: | |
373 | DBG(4,"B%d,PH_DEACTIVATE_REQUEST", bcs->channel + 1); | |
374 | st5481B_mode(bcs, L1_MODE_NULL); | |
375 | B_L1L2(bcs, PH_DEACTIVATE | INDICATION, NULL); | |
376 | break; | |
377 | default: | |
b6c63937 | 378 | WARNING("pr %#x\n", pr); |
1da177e4 LT |
379 | } |
380 | } |