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