Commit | Line | Data |
---|---|---|
53618cc1 PS |
1 | /* |
2 | * Shared Transport Line discipline driver Core | |
3 | * This hooks up ST KIM driver and ST LL driver | |
a0cc2f3b PS |
4 | * Copyright (C) 2009-2010 Texas Instruments |
5 | * Author: Pavan Savoy <pavan_savoy@ti.com> | |
53618cc1 PS |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #define pr_fmt(fmt) "(stc): " fmt | |
23 | #include <linux/module.h> | |
24 | #include <linux/kernel.h> | |
53618cc1 PS |
25 | #include <linux/tty.h> |
26 | ||
5c88b021 PS |
27 | #include <linux/seq_file.h> |
28 | #include <linux/skbuff.h> | |
29 | ||
e5558679 | 30 | #include <linux/ti_wilink_st.h> |
53618cc1 | 31 | |
27712b39 PS |
32 | extern void st_kim_recv(void *, const unsigned char *, long); |
33 | void st_int_recv(void *, const unsigned char *, long); | |
53618cc1 PS |
34 | /* function pointer pointing to either, |
35 | * st_kim_recv during registration to receive fw download responses | |
36 | * st_int_recv after registration to receive proto stack responses | |
37 | */ | |
27712b39 | 38 | static void (*st_recv) (void *, const unsigned char *, long); |
53618cc1 PS |
39 | |
40 | /********************************************************************/ | |
5c88b021 PS |
41 | static void add_channel_to_table(struct st_data_s *st_gdata, |
42 | struct st_proto_s *new_proto) | |
53618cc1 | 43 | { |
5c88b021 PS |
44 | pr_info("%s: id %d\n", __func__, new_proto->chnl_id); |
45 | /* list now has the channel id as index itself */ | |
46 | st_gdata->list[new_proto->chnl_id] = new_proto; | |
764b0c4b | 47 | st_gdata->is_registered[new_proto->chnl_id] = true; |
5c88b021 PS |
48 | } |
49 | ||
50 | static void remove_channel_from_table(struct st_data_s *st_gdata, | |
51 | struct st_proto_s *proto) | |
52 | { | |
53 | pr_info("%s: id %d\n", __func__, proto->chnl_id); | |
764b0c4b PS |
54 | /* st_gdata->list[proto->chnl_id] = NULL; */ |
55 | st_gdata->is_registered[proto->chnl_id] = false; | |
53618cc1 | 56 | } |
36b5aee4 | 57 | |
ef04d121 PS |
58 | /* |
59 | * called from KIM during firmware download. | |
60 | * | |
61 | * This is a wrapper function to tty->ops->write_room. | |
62 | * It returns number of free space available in | |
63 | * uart tx buffer. | |
64 | */ | |
65 | int st_get_uart_wr_room(struct st_data_s *st_gdata) | |
66 | { | |
67 | struct tty_struct *tty; | |
68 | if (unlikely(st_gdata == NULL || st_gdata->tty == NULL)) { | |
69 | pr_err("tty unavailable to perform write"); | |
70 | return -1; | |
71 | } | |
72 | tty = st_gdata->tty; | |
73 | return tty->ops->write_room(tty); | |
74 | } | |
75 | ||
53618cc1 PS |
76 | /* can be called in from |
77 | * -- KIM (during fw download) | |
78 | * -- ST Core (during st_write) | |
79 | * | |
80 | * This is the internal write function - a wrapper | |
81 | * to tty->ops->write | |
82 | */ | |
83 | int st_int_write(struct st_data_s *st_gdata, | |
84 | const unsigned char *data, int count) | |
85 | { | |
53618cc1 PS |
86 | struct tty_struct *tty; |
87 | if (unlikely(st_gdata == NULL || st_gdata->tty == NULL)) { | |
88 | pr_err("tty unavailable to perform write"); | |
70442664 | 89 | return -EINVAL; |
53618cc1 PS |
90 | } |
91 | tty = st_gdata->tty; | |
92 | #ifdef VERBOSE | |
e6d9e64e PS |
93 | print_hex_dump(KERN_DEBUG, "<out<", DUMP_PREFIX_NONE, |
94 | 16, 1, data, count, 0); | |
53618cc1 PS |
95 | #endif |
96 | return tty->ops->write(tty, data, count); | |
97 | ||
98 | } | |
99 | ||
100 | /* | |
101 | * push the skb received to relevant | |
102 | * protocol stacks | |
103 | */ | |
27712b39 | 104 | static void st_send_frame(unsigned char chnl_id, struct st_data_s *st_gdata) |
53618cc1 | 105 | { |
6710fcff | 106 | pr_debug(" %s(prot:%d) ", __func__, chnl_id); |
53618cc1 PS |
107 | |
108 | if (unlikely | |
109 | (st_gdata == NULL || st_gdata->rx_skb == NULL | |
764b0c4b | 110 | || st_gdata->is_registered[chnl_id] == false)) { |
5c88b021 PS |
111 | pr_err("chnl_id %d not registered, no data to send?", |
112 | chnl_id); | |
53618cc1 PS |
113 | kfree_skb(st_gdata->rx_skb); |
114 | return; | |
115 | } | |
116 | /* this cannot fail | |
117 | * this shouldn't take long | |
118 | * - should be just skb_queue_tail for the | |
119 | * protocol stack driver | |
120 | */ | |
5c88b021 | 121 | if (likely(st_gdata->list[chnl_id]->recv != NULL)) { |
bb8f3c06 | 122 | if (unlikely |
5c88b021 PS |
123 | (st_gdata->list[chnl_id]->recv |
124 | (st_gdata->list[chnl_id]->priv_data, st_gdata->rx_skb) | |
320920cb | 125 | != 0)) { |
5c88b021 | 126 | pr_err(" proto stack %d's ->recv failed", chnl_id); |
53618cc1 PS |
127 | kfree_skb(st_gdata->rx_skb); |
128 | return; | |
129 | } | |
130 | } else { | |
5c88b021 | 131 | pr_err(" proto stack %d's ->recv null", chnl_id); |
53618cc1 PS |
132 | kfree_skb(st_gdata->rx_skb); |
133 | } | |
53618cc1 PS |
134 | return; |
135 | } | |
136 | ||
36b5aee4 PS |
137 | /** |
138 | * st_reg_complete - | |
53618cc1 PS |
139 | * to call registration complete callbacks |
140 | * of all protocol stack drivers | |
bfb88d6c PS |
141 | * This function is being called with spin lock held, protocol drivers are |
142 | * only expected to complete their waits and do nothing more than that. | |
53618cc1 | 143 | */ |
4360fa22 | 144 | static void st_reg_complete(struct st_data_s *st_gdata, int err) |
53618cc1 PS |
145 | { |
146 | unsigned char i = 0; | |
147 | pr_info(" %s ", __func__); | |
5c88b021 | 148 | for (i = 0; i < ST_MAX_CHANNELS; i++) { |
764b0c4b PS |
149 | if (likely(st_gdata != NULL && |
150 | st_gdata->is_registered[i] == true && | |
151 | st_gdata->list[i]->reg_complete_cb != NULL)) { | |
bb8f3c06 PS |
152 | st_gdata->list[i]->reg_complete_cb |
153 | (st_gdata->list[i]->priv_data, err); | |
70442664 PS |
154 | pr_info("protocol %d's cb sent %d\n", i, err); |
155 | if (err) { /* cleanup registered protocol */ | |
764b0c4b | 156 | st_gdata->is_registered[i] = false; |
e4ebe5fe LJ |
157 | if (st_gdata->protos_registered) |
158 | st_gdata->protos_registered--; | |
70442664 PS |
159 | } |
160 | } | |
53618cc1 PS |
161 | } |
162 | } | |
163 | ||
164 | static inline int st_check_data_len(struct st_data_s *st_gdata, | |
5c88b021 | 165 | unsigned char chnl_id, int len) |
53618cc1 | 166 | { |
73f12e8d | 167 | int room = skb_tailroom(st_gdata->rx_skb); |
53618cc1 | 168 | |
e6d9e64e | 169 | pr_debug("len %d room %d", len, room); |
53618cc1 PS |
170 | |
171 | if (!len) { | |
172 | /* Received packet has only packet header and | |
173 | * has zero length payload. So, ask ST CORE to | |
174 | * forward the packet to protocol driver (BT/FM/GPS) | |
175 | */ | |
5c88b021 | 176 | st_send_frame(chnl_id, st_gdata); |
53618cc1 PS |
177 | |
178 | } else if (len > room) { | |
179 | /* Received packet's payload length is larger. | |
180 | * We can't accommodate it in created skb. | |
181 | */ | |
182 | pr_err("Data length is too large len %d room %d", len, | |
183 | room); | |
184 | kfree_skb(st_gdata->rx_skb); | |
185 | } else { | |
186 | /* Packet header has non-zero payload length and | |
187 | * we have enough space in created skb. Lets read | |
188 | * payload data */ | |
5c88b021 | 189 | st_gdata->rx_state = ST_W4_DATA; |
53618cc1 PS |
190 | st_gdata->rx_count = len; |
191 | return len; | |
192 | } | |
193 | ||
194 | /* Change ST state to continue to process next | |
195 | * packet */ | |
196 | st_gdata->rx_state = ST_W4_PACKET_TYPE; | |
197 | st_gdata->rx_skb = NULL; | |
198 | st_gdata->rx_count = 0; | |
5c88b021 | 199 | st_gdata->rx_chnl = 0; |
53618cc1 PS |
200 | |
201 | return 0; | |
202 | } | |
203 | ||
36b5aee4 PS |
204 | /** |
205 | * st_wakeup_ack - internal function for action when wake-up ack | |
206 | * received | |
53618cc1 PS |
207 | */ |
208 | static inline void st_wakeup_ack(struct st_data_s *st_gdata, | |
209 | unsigned char cmd) | |
210 | { | |
73f12e8d | 211 | struct sk_buff *waiting_skb; |
53618cc1 PS |
212 | unsigned long flags = 0; |
213 | ||
214 | spin_lock_irqsave(&st_gdata->lock, flags); | |
215 | /* de-Q from waitQ and Q in txQ now that the | |
216 | * chip is awake | |
217 | */ | |
218 | while ((waiting_skb = skb_dequeue(&st_gdata->tx_waitq))) | |
219 | skb_queue_tail(&st_gdata->txq, waiting_skb); | |
220 | ||
221 | /* state forwarded to ST LL */ | |
222 | st_ll_sleep_state(st_gdata, (unsigned long)cmd); | |
223 | spin_unlock_irqrestore(&st_gdata->lock, flags); | |
224 | ||
225 | /* wake up to send the recently copied skbs from waitQ */ | |
226 | st_tx_wakeup(st_gdata); | |
227 | } | |
228 | ||
36b5aee4 PS |
229 | /** |
230 | * st_int_recv - ST's internal receive function. | |
231 | * Decodes received RAW data and forwards to corresponding | |
232 | * client drivers (Bluetooth,FM,GPS..etc). | |
233 | * This can receive various types of packets, | |
234 | * HCI-Events, ACL, SCO, 4 types of HCI-LL PM packets | |
235 | * CH-8 packets from FM, CH-9 packets from GPS cores. | |
53618cc1 PS |
236 | */ |
237 | void st_int_recv(void *disc_data, | |
238 | const unsigned char *data, long count) | |
239 | { | |
73f12e8d | 240 | char *ptr; |
5c88b021 PS |
241 | struct st_proto_s *proto; |
242 | unsigned short payload_len = 0; | |
25c22d5b | 243 | int len = 0; |
244 | unsigned char type = 0; | |
5c88b021 | 245 | unsigned char *plen; |
53618cc1 | 246 | struct st_data_s *st_gdata = (struct st_data_s *)disc_data; |
6d71ba21 | 247 | unsigned long flags; |
53618cc1 PS |
248 | |
249 | ptr = (char *)data; | |
250 | /* tty_receive sent null ? */ | |
251 | if (unlikely(ptr == NULL) || (st_gdata == NULL)) { | |
252 | pr_err(" received null from TTY "); | |
253 | return; | |
254 | } | |
255 | ||
6710fcff | 256 | pr_debug("count %ld rx_state %ld" |
53618cc1 PS |
257 | "rx_count %ld", count, st_gdata->rx_state, |
258 | st_gdata->rx_count); | |
259 | ||
6d71ba21 | 260 | spin_lock_irqsave(&st_gdata->lock, flags); |
53618cc1 PS |
261 | /* Decode received bytes here */ |
262 | while (count) { | |
263 | if (st_gdata->rx_count) { | |
264 | len = min_t(unsigned int, st_gdata->rx_count, count); | |
59ae1d12 | 265 | skb_put_data(st_gdata->rx_skb, ptr, len); |
53618cc1 PS |
266 | st_gdata->rx_count -= len; |
267 | count -= len; | |
268 | ptr += len; | |
269 | ||
270 | if (st_gdata->rx_count) | |
271 | continue; | |
272 | ||
273 | /* Check ST RX state machine , where are we? */ | |
274 | switch (st_gdata->rx_state) { | |
5c88b021 PS |
275 | /* Waiting for complete packet ? */ |
276 | case ST_W4_DATA: | |
e6d9e64e | 277 | pr_debug("Complete pkt received"); |
53618cc1 PS |
278 | /* Ask ST CORE to forward |
279 | * the packet to protocol driver */ | |
5c88b021 | 280 | st_send_frame(st_gdata->rx_chnl, st_gdata); |
53618cc1 PS |
281 | |
282 | st_gdata->rx_state = ST_W4_PACKET_TYPE; | |
283 | st_gdata->rx_skb = NULL; | |
53618cc1 | 284 | continue; |
5c88b021 PS |
285 | /* parse the header to know details */ |
286 | case ST_W4_HEADER: | |
287 | proto = st_gdata->list[st_gdata->rx_chnl]; | |
288 | plen = | |
289 | &st_gdata->rx_skb->data | |
290 | [proto->offset_len_in_hdr]; | |
6710fcff | 291 | pr_debug("plen pointing to %x\n", *plen); |
5c88b021 PS |
292 | if (proto->len_size == 1)/* 1 byte len field */ |
293 | payload_len = *(unsigned char *)plen; | |
294 | else if (proto->len_size == 2) | |
295 | payload_len = | |
296 | __le16_to_cpu(*(unsigned short *)plen); | |
297 | else | |
298 | pr_info("%s: invalid length " | |
299 | "for id %d\n", | |
300 | __func__, proto->chnl_id); | |
301 | st_check_data_len(st_gdata, proto->chnl_id, | |
302 | payload_len); | |
6710fcff | 303 | pr_debug("off %d, pay len %d\n", |
5c88b021 | 304 | proto->offset_len_in_hdr, payload_len); |
53618cc1 PS |
305 | continue; |
306 | } /* end of switch rx_state */ | |
307 | } | |
308 | ||
309 | /* end of if rx_count */ | |
310 | /* Check first byte of packet and identify module | |
311 | * owner (BT/FM/GPS) */ | |
312 | switch (*ptr) { | |
53618cc1 PS |
313 | case LL_SLEEP_IND: |
314 | case LL_SLEEP_ACK: | |
315 | case LL_WAKE_UP_IND: | |
6710fcff | 316 | pr_debug("PM packet"); |
53618cc1 PS |
317 | /* this takes appropriate action based on |
318 | * sleep state received -- | |
319 | */ | |
320 | st_ll_sleep_state(st_gdata, *ptr); | |
6d71ba21 PS |
321 | /* if WAKEUP_IND collides copy from waitq to txq |
322 | * and assume chip awake | |
323 | */ | |
324 | spin_unlock_irqrestore(&st_gdata->lock, flags); | |
325 | if (st_ll_getstate(st_gdata) == ST_LL_AWAKE) | |
326 | st_wakeup_ack(st_gdata, LL_WAKE_UP_ACK); | |
327 | spin_lock_irqsave(&st_gdata->lock, flags); | |
328 | ||
53618cc1 PS |
329 | ptr++; |
330 | count--; | |
331 | continue; | |
332 | case LL_WAKE_UP_ACK: | |
6710fcff | 333 | pr_debug("PM packet"); |
6d71ba21 PS |
334 | |
335 | spin_unlock_irqrestore(&st_gdata->lock, flags); | |
53618cc1 PS |
336 | /* wake up ack received */ |
337 | st_wakeup_ack(st_gdata, *ptr); | |
6d71ba21 PS |
338 | spin_lock_irqsave(&st_gdata->lock, flags); |
339 | ||
53618cc1 PS |
340 | ptr++; |
341 | count--; | |
342 | continue; | |
343 | /* Unknow packet? */ | |
344 | default: | |
5c88b021 | 345 | type = *ptr; |
78bb9697 | 346 | |
0ec0cf19 GJ |
347 | /* Default case means non-HCILL packets, |
348 | * possibilities are packets for: | |
349 | * (a) valid protocol - Supported Protocols within | |
350 | * the ST_MAX_CHANNELS. | |
351 | * (b) registered protocol - Checked by | |
352 | * "st_gdata->list[type] == NULL)" are supported | |
353 | * protocols only. | |
354 | * Rules out any invalid protocol and | |
355 | * unregistered protocols with channel ID < 16. | |
356 | */ | |
357 | ||
358 | if ((type >= ST_MAX_CHANNELS) || | |
359 | (st_gdata->list[type] == NULL)) { | |
360 | pr_err("chip/interface misbehavior: " | |
361 | "dropping frame starting " | |
362 | "with 0x%02x\n", type); | |
363 | goto done; | |
78bb9697 | 364 | } |
0ec0cf19 | 365 | |
5c88b021 PS |
366 | st_gdata->rx_skb = alloc_skb( |
367 | st_gdata->list[type]->max_frame_size, | |
368 | GFP_ATOMIC); | |
5353cf08 AC |
369 | if (st_gdata->rx_skb == NULL) { |
370 | pr_err("out of memory: dropping\n"); | |
371 | goto done; | |
372 | } | |
373 | ||
5c88b021 PS |
374 | skb_reserve(st_gdata->rx_skb, |
375 | st_gdata->list[type]->reserve); | |
376 | /* next 2 required for BT only */ | |
377 | st_gdata->rx_skb->cb[0] = type; /*pkt_type*/ | |
378 | st_gdata->rx_skb->cb[1] = 0; /*incoming*/ | |
379 | st_gdata->rx_chnl = *ptr; | |
380 | st_gdata->rx_state = ST_W4_HEADER; | |
381 | st_gdata->rx_count = st_gdata->list[type]->hdr_len; | |
6710fcff | 382 | pr_debug("rx_count %ld\n", st_gdata->rx_count); |
53618cc1 PS |
383 | }; |
384 | ptr++; | |
385 | count--; | |
53618cc1 | 386 | } |
78bb9697 | 387 | done: |
6d71ba21 | 388 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
e6d9e64e | 389 | pr_debug("done %s", __func__); |
53618cc1 PS |
390 | return; |
391 | } | |
392 | ||
36b5aee4 PS |
393 | /** |
394 | * st_int_dequeue - internal de-Q function. | |
395 | * If the previous data set was not written | |
396 | * completely, return that skb which has the pending data. | |
397 | * In normal cases, return top of txq. | |
53618cc1 | 398 | */ |
27712b39 | 399 | static struct sk_buff *st_int_dequeue(struct st_data_s *st_gdata) |
53618cc1 PS |
400 | { |
401 | struct sk_buff *returning_skb; | |
402 | ||
e6d9e64e | 403 | pr_debug("%s", __func__); |
53618cc1 PS |
404 | if (st_gdata->tx_skb != NULL) { |
405 | returning_skb = st_gdata->tx_skb; | |
406 | st_gdata->tx_skb = NULL; | |
407 | return returning_skb; | |
408 | } | |
53618cc1 PS |
409 | return skb_dequeue(&st_gdata->txq); |
410 | } | |
411 | ||
36b5aee4 PS |
412 | /** |
413 | * st_int_enqueue - internal Q-ing function. | |
414 | * Will either Q the skb to txq or the tx_waitq | |
415 | * depending on the ST LL state. | |
416 | * If the chip is asleep, then Q it onto waitq and | |
417 | * wakeup the chip. | |
418 | * txq and waitq needs protection since the other contexts | |
419 | * may be sending data, waking up chip. | |
53618cc1 | 420 | */ |
27712b39 | 421 | static void st_int_enqueue(struct st_data_s *st_gdata, struct sk_buff *skb) |
53618cc1 PS |
422 | { |
423 | unsigned long flags = 0; | |
424 | ||
e6d9e64e | 425 | pr_debug("%s", __func__); |
53618cc1 PS |
426 | spin_lock_irqsave(&st_gdata->lock, flags); |
427 | ||
428 | switch (st_ll_getstate(st_gdata)) { | |
429 | case ST_LL_AWAKE: | |
6710fcff | 430 | pr_debug("ST LL is AWAKE, sending normally"); |
53618cc1 PS |
431 | skb_queue_tail(&st_gdata->txq, skb); |
432 | break; | |
433 | case ST_LL_ASLEEP_TO_AWAKE: | |
434 | skb_queue_tail(&st_gdata->tx_waitq, skb); | |
435 | break; | |
36b5aee4 | 436 | case ST_LL_AWAKE_TO_ASLEEP: |
53618cc1 PS |
437 | pr_err("ST LL is illegal state(%ld)," |
438 | "purging received skb.", st_ll_getstate(st_gdata)); | |
439 | kfree_skb(skb); | |
440 | break; | |
53618cc1 | 441 | case ST_LL_ASLEEP: |
53618cc1 PS |
442 | skb_queue_tail(&st_gdata->tx_waitq, skb); |
443 | st_ll_wakeup(st_gdata); | |
444 | break; | |
445 | default: | |
446 | pr_err("ST LL is illegal state(%ld)," | |
447 | "purging received skb.", st_ll_getstate(st_gdata)); | |
448 | kfree_skb(skb); | |
449 | break; | |
450 | } | |
36b5aee4 | 451 | |
53618cc1 | 452 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
e6d9e64e | 453 | pr_debug("done %s", __func__); |
53618cc1 PS |
454 | return; |
455 | } | |
456 | ||
457 | /* | |
458 | * internal wakeup function | |
459 | * called from either | |
460 | * - TTY layer when write's finished | |
461 | * - st_write (in context of the protocol stack) | |
462 | */ | |
b05b7c7c MHF |
463 | static void work_fn_write_wakeup(struct work_struct *work) |
464 | { | |
465 | struct st_data_s *st_gdata = container_of(work, struct st_data_s, | |
466 | work_write_wakeup); | |
467 | ||
468 | st_tx_wakeup((void *)st_gdata); | |
469 | } | |
53618cc1 PS |
470 | void st_tx_wakeup(struct st_data_s *st_data) |
471 | { | |
472 | struct sk_buff *skb; | |
473 | unsigned long flags; /* for irq save flags */ | |
e6d9e64e | 474 | pr_debug("%s", __func__); |
53618cc1 PS |
475 | /* check for sending & set flag sending here */ |
476 | if (test_and_set_bit(ST_TX_SENDING, &st_data->tx_state)) { | |
6710fcff | 477 | pr_debug("ST already sending"); |
53618cc1 PS |
478 | /* keep sending */ |
479 | set_bit(ST_TX_WAKEUP, &st_data->tx_state); | |
480 | return; | |
481 | /* TX_WAKEUP will be checked in another | |
482 | * context | |
483 | */ | |
484 | } | |
485 | do { /* come back if st_tx_wakeup is set */ | |
486 | /* woke-up to write */ | |
487 | clear_bit(ST_TX_WAKEUP, &st_data->tx_state); | |
488 | while ((skb = st_int_dequeue(st_data))) { | |
489 | int len; | |
490 | spin_lock_irqsave(&st_data->lock, flags); | |
491 | /* enable wake-up from TTY */ | |
492 | set_bit(TTY_DO_WRITE_WAKEUP, &st_data->tty->flags); | |
493 | len = st_int_write(st_data, skb->data, skb->len); | |
494 | skb_pull(skb, len); | |
495 | /* if skb->len = len as expected, skb->len=0 */ | |
496 | if (skb->len) { | |
497 | /* would be the next skb to be sent */ | |
498 | st_data->tx_skb = skb; | |
499 | spin_unlock_irqrestore(&st_data->lock, flags); | |
500 | break; | |
501 | } | |
502 | kfree_skb(skb); | |
503 | spin_unlock_irqrestore(&st_data->lock, flags); | |
504 | } | |
505 | /* if wake-up is set in another context- restart sending */ | |
506 | } while (test_bit(ST_TX_WAKEUP, &st_data->tx_state)); | |
507 | ||
508 | /* clear flag sending */ | |
509 | clear_bit(ST_TX_SENDING, &st_data->tx_state); | |
510 | } | |
511 | ||
512 | /********************************************************************/ | |
513 | /* functions called from ST KIM | |
514 | */ | |
c1afac15 | 515 | void kim_st_list_protocols(struct st_data_s *st_gdata, void *buf) |
53618cc1 | 516 | { |
c1afac15 | 517 | seq_printf(buf, "[%d]\nBT=%c\nFM=%c\nGPS=%c\n", |
36e574fe | 518 | st_gdata->protos_registered, |
764b0c4b PS |
519 | st_gdata->is_registered[0x04] == true ? 'R' : 'U', |
520 | st_gdata->is_registered[0x08] == true ? 'R' : 'U', | |
521 | st_gdata->is_registered[0x09] == true ? 'R' : 'U'); | |
53618cc1 PS |
522 | } |
523 | ||
524 | /********************************************************************/ | |
525 | /* | |
526 | * functions called from protocol stack drivers | |
527 | * to be EXPORT-ed | |
528 | */ | |
529 | long st_register(struct st_proto_s *new_proto) | |
530 | { | |
531 | struct st_data_s *st_gdata; | |
320920cb | 532 | long err = 0; |
53618cc1 PS |
533 | unsigned long flags = 0; |
534 | ||
dbd3a870 | 535 | st_kim_ref(&st_gdata, 0); |
53618cc1 PS |
536 | if (st_gdata == NULL || new_proto == NULL || new_proto->recv == NULL |
537 | || new_proto->reg_complete_cb == NULL) { | |
538 | pr_err("gdata/new_proto/recv or reg_complete_cb not ready"); | |
70442664 | 539 | return -EINVAL; |
53618cc1 PS |
540 | } |
541 | ||
5c88b021 PS |
542 | if (new_proto->chnl_id >= ST_MAX_CHANNELS) { |
543 | pr_err("chnl_id %d not supported", new_proto->chnl_id); | |
320920cb | 544 | return -EPROTONOSUPPORT; |
53618cc1 PS |
545 | } |
546 | ||
764b0c4b | 547 | if (st_gdata->is_registered[new_proto->chnl_id] == true) { |
5c88b021 | 548 | pr_err("chnl_id %d already registered", new_proto->chnl_id); |
320920cb | 549 | return -EALREADY; |
53618cc1 PS |
550 | } |
551 | ||
552 | /* can be from process context only */ | |
553 | spin_lock_irqsave(&st_gdata->lock, flags); | |
554 | ||
555 | if (test_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state)) { | |
5c88b021 | 556 | pr_info(" ST_REG_IN_PROGRESS:%d ", new_proto->chnl_id); |
53618cc1 | 557 | /* fw download in progress */ |
53618cc1 | 558 | |
5c88b021 | 559 | add_channel_to_table(st_gdata, new_proto); |
36e574fe | 560 | st_gdata->protos_registered++; |
53618cc1 PS |
561 | new_proto->write = st_write; |
562 | ||
563 | set_bit(ST_REG_PENDING, &st_gdata->st_state); | |
564 | spin_unlock_irqrestore(&st_gdata->lock, flags); | |
320920cb | 565 | return -EINPROGRESS; |
53618cc1 | 566 | } else if (st_gdata->protos_registered == ST_EMPTY) { |
5c88b021 | 567 | pr_info(" chnl_id list empty :%d ", new_proto->chnl_id); |
53618cc1 PS |
568 | set_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state); |
569 | st_recv = st_kim_recv; | |
570 | ||
bfb88d6c PS |
571 | /* enable the ST LL - to set default chip state */ |
572 | st_ll_enable(st_gdata); | |
573 | ||
53618cc1 PS |
574 | /* release lock previously held - re-locked below */ |
575 | spin_unlock_irqrestore(&st_gdata->lock, flags); | |
576 | ||
53618cc1 PS |
577 | /* this may take a while to complete |
578 | * since it involves BT fw download | |
579 | */ | |
38d9df49 | 580 | err = st_kim_start(st_gdata->kim_data); |
320920cb | 581 | if (err != 0) { |
53618cc1 PS |
582 | clear_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state); |
583 | if ((st_gdata->protos_registered != ST_EMPTY) && | |
584 | (test_bit(ST_REG_PENDING, &st_gdata->st_state))) { | |
585 | pr_err(" KIM failure complete callback "); | |
3a2d3d21 | 586 | spin_lock_irqsave(&st_gdata->lock, flags); |
70442664 | 587 | st_reg_complete(st_gdata, err); |
3a2d3d21 | 588 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
bfb88d6c | 589 | clear_bit(ST_REG_PENDING, &st_gdata->st_state); |
53618cc1 | 590 | } |
70442664 | 591 | return -EINVAL; |
53618cc1 PS |
592 | } |
593 | ||
bfb88d6c PS |
594 | spin_lock_irqsave(&st_gdata->lock, flags); |
595 | ||
53618cc1 PS |
596 | clear_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state); |
597 | st_recv = st_int_recv; | |
598 | ||
599 | /* this is where all pending registration | |
600 | * are signalled to be complete by calling callback functions | |
601 | */ | |
602 | if ((st_gdata->protos_registered != ST_EMPTY) && | |
603 | (test_bit(ST_REG_PENDING, &st_gdata->st_state))) { | |
e6d9e64e | 604 | pr_debug(" call reg complete callback "); |
320920cb | 605 | st_reg_complete(st_gdata, 0); |
53618cc1 PS |
606 | } |
607 | clear_bit(ST_REG_PENDING, &st_gdata->st_state); | |
608 | ||
609 | /* check for already registered once more, | |
610 | * since the above check is old | |
611 | */ | |
764b0c4b | 612 | if (st_gdata->is_registered[new_proto->chnl_id] == true) { |
53618cc1 | 613 | pr_err(" proto %d already registered ", |
5c88b021 | 614 | new_proto->chnl_id); |
bfb88d6c | 615 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
320920cb | 616 | return -EALREADY; |
53618cc1 PS |
617 | } |
618 | ||
5c88b021 | 619 | add_channel_to_table(st_gdata, new_proto); |
36e574fe | 620 | st_gdata->protos_registered++; |
53618cc1 PS |
621 | new_proto->write = st_write; |
622 | spin_unlock_irqrestore(&st_gdata->lock, flags); | |
623 | return err; | |
624 | } | |
625 | /* if fw is already downloaded & new stack registers protocol */ | |
626 | else { | |
5c88b021 | 627 | add_channel_to_table(st_gdata, new_proto); |
36e574fe | 628 | st_gdata->protos_registered++; |
53618cc1 PS |
629 | new_proto->write = st_write; |
630 | ||
631 | /* lock already held before entering else */ | |
632 | spin_unlock_irqrestore(&st_gdata->lock, flags); | |
633 | return err; | |
634 | } | |
53618cc1 PS |
635 | } |
636 | EXPORT_SYMBOL_GPL(st_register); | |
637 | ||
638 | /* to unregister a protocol - | |
639 | * to be called from protocol stack driver | |
640 | */ | |
5c88b021 | 641 | long st_unregister(struct st_proto_s *proto) |
53618cc1 | 642 | { |
320920cb | 643 | long err = 0; |
53618cc1 PS |
644 | unsigned long flags = 0; |
645 | struct st_data_s *st_gdata; | |
646 | ||
5c88b021 | 647 | pr_debug("%s: %d ", __func__, proto->chnl_id); |
53618cc1 | 648 | |
dbd3a870 | 649 | st_kim_ref(&st_gdata, 0); |
7316a9f2 | 650 | if (!st_gdata || proto->chnl_id >= ST_MAX_CHANNELS) { |
5c88b021 | 651 | pr_err(" chnl_id %d not supported", proto->chnl_id); |
320920cb | 652 | return -EPROTONOSUPPORT; |
53618cc1 PS |
653 | } |
654 | ||
655 | spin_lock_irqsave(&st_gdata->lock, flags); | |
656 | ||
bfb88d6c | 657 | if (st_gdata->is_registered[proto->chnl_id] == false) { |
5c88b021 | 658 | pr_err(" chnl_id %d not registered", proto->chnl_id); |
53618cc1 | 659 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
320920cb | 660 | return -EPROTONOSUPPORT; |
53618cc1 PS |
661 | } |
662 | ||
e4ebe5fe LJ |
663 | if (st_gdata->protos_registered) |
664 | st_gdata->protos_registered--; | |
665 | ||
5c88b021 | 666 | remove_channel_from_table(st_gdata, proto); |
53618cc1 PS |
667 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
668 | ||
669 | if ((st_gdata->protos_registered == ST_EMPTY) && | |
670 | (!test_bit(ST_REG_PENDING, &st_gdata->st_state))) { | |
5c88b021 | 671 | pr_info(" all chnl_ids unregistered "); |
53618cc1 PS |
672 | |
673 | /* stop traffic on tty */ | |
674 | if (st_gdata->tty) { | |
675 | tty_ldisc_flush(st_gdata->tty); | |
676 | stop_tty(st_gdata->tty); | |
677 | } | |
678 | ||
5c88b021 | 679 | /* all chnl_ids now unregistered */ |
38d9df49 | 680 | st_kim_stop(st_gdata->kim_data); |
53618cc1 PS |
681 | /* disable ST LL */ |
682 | st_ll_disable(st_gdata); | |
683 | } | |
684 | return err; | |
685 | } | |
686 | ||
687 | /* | |
688 | * called in protocol stack drivers | |
689 | * via the write function pointer | |
690 | */ | |
691 | long st_write(struct sk_buff *skb) | |
692 | { | |
693 | struct st_data_s *st_gdata; | |
53618cc1 PS |
694 | long len; |
695 | ||
dbd3a870 | 696 | st_kim_ref(&st_gdata, 0); |
53618cc1 PS |
697 | if (unlikely(skb == NULL || st_gdata == NULL |
698 | || st_gdata->tty == NULL)) { | |
699 | pr_err("data/tty unavailable to perform write"); | |
70442664 | 700 | return -EINVAL; |
53618cc1 | 701 | } |
c1605f2e | 702 | |
e6d9e64e | 703 | pr_debug("%d to be written", skb->len); |
53618cc1 PS |
704 | len = skb->len; |
705 | ||
706 | /* st_ll to decide where to enqueue the skb */ | |
707 | st_int_enqueue(st_gdata, skb); | |
708 | /* wake up */ | |
709 | st_tx_wakeup(st_gdata); | |
710 | ||
711 | /* return number of bytes written */ | |
712 | return len; | |
713 | } | |
714 | ||
715 | /* for protocols making use of shared transport */ | |
716 | EXPORT_SYMBOL_GPL(st_unregister); | |
717 | ||
718 | /********************************************************************/ | |
719 | /* | |
720 | * functions called from TTY layer | |
721 | */ | |
722 | static int st_tty_open(struct tty_struct *tty) | |
723 | { | |
320920cb | 724 | int err = 0; |
53618cc1 PS |
725 | struct st_data_s *st_gdata; |
726 | pr_info("%s ", __func__); | |
727 | ||
dbd3a870 | 728 | st_kim_ref(&st_gdata, 0); |
53618cc1 PS |
729 | st_gdata->tty = tty; |
730 | tty->disc_data = st_gdata; | |
731 | ||
732 | /* don't do an wakeup for now */ | |
733 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
734 | ||
735 | /* mem already allocated | |
736 | */ | |
737 | tty->receive_room = 65536; | |
738 | /* Flush any pending characters in the driver and discipline. */ | |
739 | tty_ldisc_flush(tty); | |
740 | tty_driver_flush_buffer(tty); | |
741 | /* | |
742 | * signal to UIM via KIM that - | |
743 | * installation of N_TI_WL ldisc is complete | |
744 | */ | |
38d9df49 | 745 | st_kim_complete(st_gdata->kim_data); |
e6d9e64e | 746 | pr_debug("done %s", __func__); |
53618cc1 PS |
747 | return err; |
748 | } | |
749 | ||
750 | static void st_tty_close(struct tty_struct *tty) | |
751 | { | |
5c88b021 | 752 | unsigned char i = ST_MAX_CHANNELS; |
53618cc1 PS |
753 | unsigned long flags = 0; |
754 | struct st_data_s *st_gdata = tty->disc_data; | |
755 | ||
756 | pr_info("%s ", __func__); | |
757 | ||
758 | /* TODO: | |
759 | * if a protocol has been registered & line discipline | |
760 | * un-installed for some reason - what should be done ? | |
761 | */ | |
762 | spin_lock_irqsave(&st_gdata->lock, flags); | |
5c88b021 | 763 | for (i = ST_BT; i < ST_MAX_CHANNELS; i++) { |
5926cef2 | 764 | if (st_gdata->is_registered[i] == true) |
53618cc1 PS |
765 | pr_err("%d not un-registered", i); |
766 | st_gdata->list[i] = NULL; | |
651d62a8 | 767 | st_gdata->is_registered[i] = false; |
53618cc1 | 768 | } |
bb8f3c06 | 769 | st_gdata->protos_registered = 0; |
53618cc1 PS |
770 | spin_unlock_irqrestore(&st_gdata->lock, flags); |
771 | /* | |
772 | * signal to UIM via KIM that - | |
773 | * N_TI_WL ldisc is un-installed | |
774 | */ | |
38d9df49 | 775 | st_kim_complete(st_gdata->kim_data); |
53618cc1 PS |
776 | st_gdata->tty = NULL; |
777 | /* Flush any pending characters in the driver and discipline. */ | |
778 | tty_ldisc_flush(tty); | |
779 | tty_driver_flush_buffer(tty); | |
780 | ||
781 | spin_lock_irqsave(&st_gdata->lock, flags); | |
782 | /* empty out txq and tx_waitq */ | |
783 | skb_queue_purge(&st_gdata->txq); | |
784 | skb_queue_purge(&st_gdata->tx_waitq); | |
785 | /* reset the TTY Rx states of ST */ | |
786 | st_gdata->rx_count = 0; | |
787 | st_gdata->rx_state = ST_W4_PACKET_TYPE; | |
788 | kfree_skb(st_gdata->rx_skb); | |
789 | st_gdata->rx_skb = NULL; | |
790 | spin_unlock_irqrestore(&st_gdata->lock, flags); | |
791 | ||
e6d9e64e | 792 | pr_debug("%s: done ", __func__); |
53618cc1 PS |
793 | } |
794 | ||
55db4c64 LT |
795 | static void st_tty_receive(struct tty_struct *tty, const unsigned char *data, |
796 | char *tty_flags, int count) | |
53618cc1 | 797 | { |
53618cc1 | 798 | #ifdef VERBOSE |
e6d9e64e PS |
799 | print_hex_dump(KERN_DEBUG, ">in>", DUMP_PREFIX_NONE, |
800 | 16, 1, data, count, 0); | |
53618cc1 PS |
801 | #endif |
802 | ||
803 | /* | |
804 | * if fw download is in progress then route incoming data | |
805 | * to KIM for validation | |
806 | */ | |
807 | st_recv(tty->disc_data, data, count); | |
e6d9e64e | 808 | pr_debug("done %s", __func__); |
53618cc1 PS |
809 | } |
810 | ||
811 | /* wake-up function called in from the TTY layer | |
812 | * inside the internal wakeup function will be called | |
813 | */ | |
814 | static void st_tty_wakeup(struct tty_struct *tty) | |
815 | { | |
816 | struct st_data_s *st_gdata = tty->disc_data; | |
e6d9e64e | 817 | pr_debug("%s ", __func__); |
53618cc1 PS |
818 | /* don't do an wakeup for now */ |
819 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
820 | ||
b05b7c7c MHF |
821 | /* |
822 | * schedule the internal wakeup instead of calling directly to | |
823 | * avoid lockup (port->lock needed in tty->ops->write is | |
824 | * already taken here | |
825 | */ | |
826 | schedule_work(&st_gdata->work_write_wakeup); | |
53618cc1 PS |
827 | } |
828 | ||
829 | static void st_tty_flush_buffer(struct tty_struct *tty) | |
830 | { | |
831 | struct st_data_s *st_gdata = tty->disc_data; | |
e6d9e64e | 832 | pr_debug("%s ", __func__); |
53618cc1 PS |
833 | |
834 | kfree_skb(st_gdata->tx_skb); | |
835 | st_gdata->tx_skb = NULL; | |
836 | ||
94459a97 | 837 | tty_driver_flush_buffer(tty); |
53618cc1 PS |
838 | return; |
839 | } | |
840 | ||
73f12e8d PS |
841 | static struct tty_ldisc_ops st_ldisc_ops = { |
842 | .magic = TTY_LDISC_MAGIC, | |
843 | .name = "n_st", | |
844 | .open = st_tty_open, | |
845 | .close = st_tty_close, | |
846 | .receive_buf = st_tty_receive, | |
847 | .write_wakeup = st_tty_wakeup, | |
848 | .flush_buffer = st_tty_flush_buffer, | |
849 | .owner = THIS_MODULE | |
850 | }; | |
851 | ||
53618cc1 PS |
852 | /********************************************************************/ |
853 | int st_core_init(struct st_data_s **core_data) | |
854 | { | |
855 | struct st_data_s *st_gdata; | |
856 | long err; | |
53618cc1 | 857 | |
73f12e8d | 858 | err = tty_register_ldisc(N_TI_WL, &st_ldisc_ops); |
53618cc1 PS |
859 | if (err) { |
860 | pr_err("error registering %d line discipline %ld", | |
861 | N_TI_WL, err); | |
53618cc1 PS |
862 | return err; |
863 | } | |
e6d9e64e | 864 | pr_debug("registered n_shared line discipline"); |
53618cc1 PS |
865 | |
866 | st_gdata = kzalloc(sizeof(struct st_data_s), GFP_KERNEL); | |
867 | if (!st_gdata) { | |
868 | pr_err("memory allocation failed"); | |
869 | err = tty_unregister_ldisc(N_TI_WL); | |
870 | if (err) | |
871 | pr_err("unable to un-register ldisc %ld", err); | |
53618cc1 PS |
872 | err = -ENOMEM; |
873 | return err; | |
874 | } | |
875 | ||
876 | /* Initialize ST TxQ and Tx waitQ queue head. All BT/FM/GPS module skb's | |
877 | * will be pushed in this queue for actual transmission. | |
878 | */ | |
879 | skb_queue_head_init(&st_gdata->txq); | |
880 | skb_queue_head_init(&st_gdata->tx_waitq); | |
881 | ||
882 | /* Locking used in st_int_enqueue() to avoid multiple execution */ | |
883 | spin_lock_init(&st_gdata->lock); | |
884 | ||
53618cc1 PS |
885 | err = st_ll_init(st_gdata); |
886 | if (err) { | |
887 | pr_err("error during st_ll initialization(%ld)", err); | |
888 | kfree(st_gdata); | |
889 | err = tty_unregister_ldisc(N_TI_WL); | |
890 | if (err) | |
891 | pr_err("unable to un-register ldisc"); | |
70442664 | 892 | return err; |
53618cc1 | 893 | } |
b05b7c7c MHF |
894 | |
895 | INIT_WORK(&st_gdata->work_write_wakeup, work_fn_write_wakeup); | |
896 | ||
53618cc1 PS |
897 | *core_data = st_gdata; |
898 | return 0; | |
899 | } | |
900 | ||
901 | void st_core_exit(struct st_data_s *st_gdata) | |
902 | { | |
903 | long err; | |
904 | /* internal module cleanup */ | |
905 | err = st_ll_deinit(st_gdata); | |
906 | if (err) | |
907 | pr_err("error during deinit of ST LL %ld", err); | |
73f12e8d | 908 | |
53618cc1 PS |
909 | if (st_gdata != NULL) { |
910 | /* Free ST Tx Qs and skbs */ | |
911 | skb_queue_purge(&st_gdata->txq); | |
912 | skb_queue_purge(&st_gdata->tx_waitq); | |
913 | kfree_skb(st_gdata->rx_skb); | |
914 | kfree_skb(st_gdata->tx_skb); | |
915 | /* TTY ldisc cleanup */ | |
916 | err = tty_unregister_ldisc(N_TI_WL); | |
917 | if (err) | |
918 | pr_err("unable to un-register ldisc %ld", err); | |
53618cc1 PS |
919 | /* free the global data pointer */ |
920 | kfree(st_gdata); | |
921 | } | |
922 | } |