include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[linux-3.10.git] / drivers / isdn / hisax / st5481_b.c
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/gfp.h>
15 #include <linux/usb.h>
16 #include <linux/netdevice.h>
17 #include <linux/bitrev.h>
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++)
76                                                 *dest++ = bitrev8(*src++);
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;
90                                 B_L1L2(bcs, PH_DATA | CONFIRM, (void *)(unsigned long) skb->truesize);
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 /*
127  * Start transfering (flags or data) on the B channel, since
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
165 static void usb_b_out_complete(struct urb *urb)
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)) {
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: 
183                                 WARNING("urb status %d",urb->status);
184                                 if (b_out->busy == 0) {
185                                         st5481_usb_pipe_reset(adapter, (bcs->channel+1)*2 | USB_DIR_OUT, NULL, NULL);
186                                 }
187                                 break;
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) {
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);
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;
357         long mode;
358
359         DBG(4, "");
360
361         switch (pr) {
362         case PH_DATA | REQUEST:
363                 BUG_ON(bcs->b_out.tx_skb);
364                 bcs->b_out.tx_skb = skb;
365                 break;
366         case PH_ACTIVATE | REQUEST:
367                 mode = (long) arg;
368                 DBG(4,"B%d,PH_ACTIVATE_REQUEST %ld", bcs->channel + 1, mode);
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:
378                 WARNING("pr %#x\n", pr);
379         }
380 }