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1/*
2 * Shared Transport Line discipline driver Core
3 * Init Manager module responsible for GPIO control
4 * and firmware download
5 * Copyright (C) 2009-2010 Texas Instruments
6 * Author: Pavan Savoy <pavan_savoy@ti.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23#define pr_fmt(fmt) "(stk) :" fmt
24#include <linux/platform_device.h>
25#include <linux/jiffies.h>
26#include <linux/firmware.h>
27#include <linux/delay.h>
28#include <linux/wait.h>
29#include <linux/gpio.h>
30#include <linux/debugfs.h>
31#include <linux/seq_file.h>
32#include <linux/sched.h>
33#include <linux/sysfs.h>
34#include <linux/tty.h>
35
36#include <linux/skbuff.h>
37#include <linux/ti_wilink_st.h>
38#include <linux/module.h>
39
40#define MAX_ST_DEVICES 3 /* Imagine 1 on each UART for now */
41static struct platform_device *st_kim_devices[MAX_ST_DEVICES];
42
43/**********************************************************************/
44/* internal functions */
45
46/**
47 * st_get_plat_device -
48 * function which returns the reference to the platform device
49 * requested by id. As of now only 1 such device exists (id=0)
50 * the context requesting for reference can get the id to be
51 * requested by a. The protocol driver which is registering or
52 * b. the tty device which is opened.
53 */
54static struct platform_device *st_get_plat_device(int id)
55{
56 return st_kim_devices[id];
57}
58
59/**
60 * validate_firmware_response -
61 * function to return whether the firmware response was proper
62 * in case of error don't complete so that waiting for proper
63 * response times out
64 */
65static void validate_firmware_response(struct kim_data_s *kim_gdata)
66{
67 struct sk_buff *skb = kim_gdata->rx_skb;
68 if (!skb)
69 return;
70
71 /* these magic numbers are the position in the response buffer which
72 * allows us to distinguish whether the response is for the read
73 * version info. command
74 */
75 if (skb->data[2] == 0x01 && skb->data[3] == 0x01 &&
76 skb->data[4] == 0x10 && skb->data[5] == 0x00) {
77 /* fw version response */
78 memcpy(kim_gdata->resp_buffer,
79 kim_gdata->rx_skb->data,
80 kim_gdata->rx_skb->len);
81 complete_all(&kim_gdata->kim_rcvd);
82 kim_gdata->rx_state = ST_W4_PACKET_TYPE;
83 kim_gdata->rx_skb = NULL;
84 kim_gdata->rx_count = 0;
85 } else if (unlikely(skb->data[5] != 0)) {
86 pr_err("no proper response during fw download");
87 pr_err("data6 %x", skb->data[5]);
88 kfree_skb(skb);
89 return; /* keep waiting for the proper response */
90 }
91 /* becos of all the script being downloaded */
92 complete_all(&kim_gdata->kim_rcvd);
93 kfree_skb(skb);
94}
95
96/* check for data len received inside kim_int_recv
97 * most often hit the last case to update state to waiting for data
98 */
99static inline int kim_check_data_len(struct kim_data_s *kim_gdata, int len)
100{
101 register int room = skb_tailroom(kim_gdata->rx_skb);
102
103 pr_debug("len %d room %d", len, room);
104
105 if (!len) {
106 validate_firmware_response(kim_gdata);
107 } else if (len > room) {
108 /* Received packet's payload length is larger.
109 * We can't accommodate it in created skb.
110 */
111 pr_err("Data length is too large len %d room %d", len,
112 room);
113 kfree_skb(kim_gdata->rx_skb);
114 } else {
115 /* Packet header has non-zero payload length and
116 * we have enough space in created skb. Lets read
117 * payload data */
118 kim_gdata->rx_state = ST_W4_DATA;
119 kim_gdata->rx_count = len;
120 return len;
121 }
122
123 /* Change ST LL state to continue to process next
124 * packet */
125 kim_gdata->rx_state = ST_W4_PACKET_TYPE;
126 kim_gdata->rx_skb = NULL;
127 kim_gdata->rx_count = 0;
128
129 return 0;
130}
131
132/**
133 * kim_int_recv - receive function called during firmware download
134 * firmware download responses on different UART drivers
135 * have been observed to come in bursts of different
136 * tty_receive and hence the logic
137 */
138static void kim_int_recv(struct kim_data_s *kim_gdata,
139 const unsigned char *data, long count)
140{
141 const unsigned char *ptr;
142 int len = 0, type = 0;
143 unsigned char *plen;
144
145 pr_debug("%s", __func__);
146 /* Decode received bytes here */
147 ptr = data;
148 if (unlikely(ptr == NULL)) {
149 pr_err(" received null from TTY ");
150 return;
151 }
152
153 while (count) {
154 if (kim_gdata->rx_count) {
155 len = min_t(unsigned int, kim_gdata->rx_count, count);
156 memcpy(skb_put(kim_gdata->rx_skb, len), ptr, len);
157 kim_gdata->rx_count -= len;
158 count -= len;
159 ptr += len;
160
161 if (kim_gdata->rx_count)
162 continue;
163
164 /* Check ST RX state machine , where are we? */
165 switch (kim_gdata->rx_state) {
166 /* Waiting for complete packet ? */
167 case ST_W4_DATA:
168 pr_debug("Complete pkt received");
169 validate_firmware_response(kim_gdata);
170 kim_gdata->rx_state = ST_W4_PACKET_TYPE;
171 kim_gdata->rx_skb = NULL;
172 continue;
173 /* Waiting for Bluetooth event header ? */
174 case ST_W4_HEADER:
175 plen =
176 (unsigned char *)&kim_gdata->rx_skb->data[1];
177 pr_debug("event hdr: plen 0x%02x\n", *plen);
178 kim_check_data_len(kim_gdata, *plen);
179 continue;
180 } /* end of switch */
181 } /* end of if rx_state */
182 switch (*ptr) {
183 /* Bluetooth event packet? */
184 case 0x04:
185 kim_gdata->rx_state = ST_W4_HEADER;
186 kim_gdata->rx_count = 2;
187 type = *ptr;
188 break;
189 default:
190 pr_info("unknown packet");
191 ptr++;
192 count--;
193 continue;
194 }
195 ptr++;
196 count--;
197 kim_gdata->rx_skb =
198 alloc_skb(1024+8, GFP_ATOMIC);
199 if (!kim_gdata->rx_skb) {
200 pr_err("can't allocate mem for new packet");
201 kim_gdata->rx_state = ST_W4_PACKET_TYPE;
202 kim_gdata->rx_count = 0;
203 return;
204 }
205 skb_reserve(kim_gdata->rx_skb, 8);
206 kim_gdata->rx_skb->cb[0] = 4;
207 kim_gdata->rx_skb->cb[1] = 0;
208
209 }
210 return;
211}
212
213static long read_local_version(struct kim_data_s *kim_gdata, char *bts_scr_name)
214{
215 unsigned short version = 0, chip = 0, min_ver = 0, maj_ver = 0;
216 const char read_ver_cmd[] = { 0x01, 0x01, 0x10, 0x00 };
217 long timeout;
218
219 pr_debug("%s", __func__);
220
221 reinit_completion(&kim_gdata->kim_rcvd);
222 if (4 != st_int_write(kim_gdata->core_data, read_ver_cmd, 4)) {
223 pr_err("kim: couldn't write 4 bytes");
224 return -EIO;
225 }
226
227 timeout = wait_for_completion_interruptible_timeout(
228 &kim_gdata->kim_rcvd, msecs_to_jiffies(CMD_RESP_TIME));
229 if (timeout <= 0) {
230 pr_err(" waiting for ver info- timed out or received signal");
231 return timeout ? -ERESTARTSYS : -ETIMEDOUT;
232 }
233 reinit_completion(&kim_gdata->kim_rcvd);
234 /* the positions 12 & 13 in the response buffer provide with the
235 * chip, major & minor numbers
236 */
237
238 version =
239 MAKEWORD(kim_gdata->resp_buffer[12],
240 kim_gdata->resp_buffer[13]);
241 chip = (version & 0x7C00) >> 10;
242 min_ver = (version & 0x007F);
243 maj_ver = (version & 0x0380) >> 7;
244
245 if (version & 0x8000)
246 maj_ver |= 0x0008;
247
248 sprintf(bts_scr_name, "ti-connectivity/TIInit_%d.%d.%d.bts",
249 chip, maj_ver, min_ver);
250
251 /* to be accessed later via sysfs entry */
252 kim_gdata->version.full = version;
253 kim_gdata->version.chip = chip;
254 kim_gdata->version.maj_ver = maj_ver;
255 kim_gdata->version.min_ver = min_ver;
256
257 pr_info("%s", bts_scr_name);
258 return 0;
259}
260
261static void skip_change_remote_baud(unsigned char **ptr, long *len)
262{
263 unsigned char *nxt_action, *cur_action;
264 cur_action = *ptr;
265
266 nxt_action = cur_action + sizeof(struct bts_action) +
267 ((struct bts_action *) cur_action)->size;
268
269 if (((struct bts_action *) nxt_action)->type != ACTION_WAIT_EVENT) {
270 pr_err("invalid action after change remote baud command");
271 } else {
272 *ptr = *ptr + sizeof(struct bts_action) +
273 ((struct bts_action *)cur_action)->size;
274 *len = *len - (sizeof(struct bts_action) +
275 ((struct bts_action *)cur_action)->size);
276 /* warn user on not commenting these in firmware */
277 pr_warn("skipping the wait event of change remote baud");
278 }
279}
280
281/**
282 * download_firmware -
283 * internal function which parses through the .bts firmware
284 * script file intreprets SEND, DELAY actions only as of now
285 */
286static long download_firmware(struct kim_data_s *kim_gdata)
287{
288 long err = 0;
289 long len = 0;
290 unsigned char *ptr = NULL;
291 unsigned char *action_ptr = NULL;
292 unsigned char bts_scr_name[40] = { 0 }; /* 40 char long bts scr name? */
293 int wr_room_space;
294 int cmd_size;
295 unsigned long timeout;
296
297 err = read_local_version(kim_gdata, bts_scr_name);
298 if (err != 0) {
299 pr_err("kim: failed to read local ver");
300 return err;
301 }
302 err =
303 request_firmware(&kim_gdata->fw_entry, bts_scr_name,
304 &kim_gdata->kim_pdev->dev);
305 if (unlikely((err != 0) || (kim_gdata->fw_entry->data == NULL) ||
306 (kim_gdata->fw_entry->size == 0))) {
307 pr_err(" request_firmware failed(errno %ld) for %s", err,
308 bts_scr_name);
309 return -EINVAL;
310 }
311 ptr = (void *)kim_gdata->fw_entry->data;
312 len = kim_gdata->fw_entry->size;
313 /* bts_header to remove out magic number and
314 * version
315 */
316 ptr += sizeof(struct bts_header);
317 len -= sizeof(struct bts_header);
318
319 while (len > 0 && ptr) {
320 pr_debug(" action size %d, type %d ",
321 ((struct bts_action *)ptr)->size,
322 ((struct bts_action *)ptr)->type);
323
324 switch (((struct bts_action *)ptr)->type) {
325 case ACTION_SEND_COMMAND: /* action send */
326 pr_debug("S");
327 action_ptr = &(((struct bts_action *)ptr)->data[0]);
328 if (unlikely
329 (((struct hci_command *)action_ptr)->opcode ==
330 0xFF36)) {
331 /* ignore remote change
332 * baud rate HCI VS command */
333 pr_warn("change remote baud"
334 " rate command in firmware");
335 skip_change_remote_baud(&ptr, &len);
336 break;
337 }
338 /*
339 * Make sure we have enough free space in uart
340 * tx buffer to write current firmware command
341 */
342 cmd_size = ((struct bts_action *)ptr)->size;
343 timeout = jiffies + msecs_to_jiffies(CMD_WR_TIME);
344 do {
345 wr_room_space =
346 st_get_uart_wr_room(kim_gdata->core_data);
347 if (wr_room_space < 0) {
348 pr_err("Unable to get free "
349 "space info from uart tx buffer");
350 release_firmware(kim_gdata->fw_entry);
351 return wr_room_space;
352 }
353 mdelay(1); /* wait 1ms before checking room */
354 } while ((wr_room_space < cmd_size) &&
355 time_before(jiffies, timeout));
356
357 /* Timeout happened ? */
358 if (time_after_eq(jiffies, timeout)) {
359 pr_err("Timeout while waiting for free "
360 "free space in uart tx buffer");
361 release_firmware(kim_gdata->fw_entry);
362 return -ETIMEDOUT;
363 }
364 /* reinit completion before sending for the
365 * relevant wait
366 */
367 reinit_completion(&kim_gdata->kim_rcvd);
368
369 /*
370 * Free space found in uart buffer, call st_int_write
371 * to send current firmware command to the uart tx
372 * buffer.
373 */
374 err = st_int_write(kim_gdata->core_data,
375 ((struct bts_action_send *)action_ptr)->data,
376 ((struct bts_action *)ptr)->size);
377 if (unlikely(err < 0)) {
378 release_firmware(kim_gdata->fw_entry);
379 return err;
380 }
381 /*
382 * Check number of bytes written to the uart tx buffer
383 * and requested command write size
384 */
385 if (err != cmd_size) {
386 pr_err("Number of bytes written to uart "
387 "tx buffer are not matching with "
388 "requested cmd write size");
389 release_firmware(kim_gdata->fw_entry);
390 return -EIO;
391 }
392 break;
393 case ACTION_WAIT_EVENT: /* wait */
394 pr_debug("W");
395 err = wait_for_completion_interruptible_timeout(
396 &kim_gdata->kim_rcvd,
397 msecs_to_jiffies(CMD_RESP_TIME));
398 if (err <= 0) {
399 pr_err("response timeout/signaled during fw download ");
400 /* timed out */
401 release_firmware(kim_gdata->fw_entry);
402 return err ? -ERESTARTSYS : -ETIMEDOUT;
403 }
404 reinit_completion(&kim_gdata->kim_rcvd);
405 break;
406 case ACTION_DELAY: /* sleep */
407 pr_info("sleep command in scr");
408 action_ptr = &(((struct bts_action *)ptr)->data[0]);
409 mdelay(((struct bts_action_delay *)action_ptr)->msec);
410 break;
411 }
412 len =
413 len - (sizeof(struct bts_action) +
414 ((struct bts_action *)ptr)->size);
415 ptr =
416 ptr + sizeof(struct bts_action) +
417 ((struct bts_action *)ptr)->size;
418 }
419 /* fw download complete */
420 release_firmware(kim_gdata->fw_entry);
421 return 0;
422}
423
424/**********************************************************************/
425/* functions called from ST core */
426/* called from ST Core, when REG_IN_PROGRESS (registration in progress)
427 * can be because of
428 * 1. response to read local version
429 * 2. during send/recv's of firmware download
430 */
431void st_kim_recv(void *disc_data, const unsigned char *data, long count)
432{
433 struct st_data_s *st_gdata = (struct st_data_s *)disc_data;
434 struct kim_data_s *kim_gdata = st_gdata->kim_data;
435
436 /* proceed to gather all data and distinguish read fw version response
437 * from other fw responses when data gathering is complete
438 */
439 kim_int_recv(kim_gdata, data, count);
440 return;
441}
442
443/* to signal completion of line discipline installation
444 * called from ST Core, upon tty_open
445 */
446void st_kim_complete(void *kim_data)
447{
448 struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;
449 complete(&kim_gdata->ldisc_installed);
450}
451
452/**
453 * st_kim_start - called from ST Core upon 1st registration
454 * This involves toggling the chip enable gpio, reading
455 * the firmware version from chip, forming the fw file name
456 * based on the chip version, requesting the fw, parsing it
457 * and perform download(send/recv).
458 */
459long st_kim_start(void *kim_data)
460{
461 long err = 0;
462 long retry = POR_RETRY_COUNT;
463 struct ti_st_plat_data *pdata;
464 struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;
465
466 pr_info(" %s", __func__);
467 pdata = kim_gdata->kim_pdev->dev.platform_data;
468
469 do {
470 /* platform specific enabling code here */
471 if (pdata->chip_enable)
472 pdata->chip_enable(kim_gdata);
473
474 /* Configure BT nShutdown to HIGH state */
475 gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW);
476 mdelay(5); /* FIXME: a proper toggle */
477 gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_HIGH);
478 mdelay(100);
479 /* re-initialize the completion */
480 reinit_completion(&kim_gdata->ldisc_installed);
481 /* send notification to UIM */
482 kim_gdata->ldisc_install = 1;
483 pr_info("ldisc_install = 1");
484 sysfs_notify(&kim_gdata->kim_pdev->dev.kobj,
485 NULL, "install");
486 /* wait for ldisc to be installed */
487 err = wait_for_completion_interruptible_timeout(
488 &kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));
489 if (!err) {
490 /* ldisc installation timeout,
491 * flush uart, power cycle BT_EN */
492 pr_err("ldisc installation timeout");
493 err = st_kim_stop(kim_gdata);
494 continue;
495 } else {
496 /* ldisc installed now */
497 pr_info("line discipline installed");
498 err = download_firmware(kim_gdata);
499 if (err != 0) {
500 /* ldisc installed but fw download failed,
501 * flush uart & power cycle BT_EN */
502 pr_err("download firmware failed");
503 err = st_kim_stop(kim_gdata);
504 continue;
505 } else { /* on success don't retry */
506 break;
507 }
508 }
509 } while (retry--);
510 return err;
511}
512
513/**
514 * st_kim_stop - stop communication with chip.
515 * This can be called from ST Core/KIM, on the-
516 * (a) last un-register when chip need not be powered there-after,
517 * (b) upon failure to either install ldisc or download firmware.
518 * The function is responsible to (a) notify UIM about un-installation,
519 * (b) flush UART if the ldisc was installed.
520 * (c) reset BT_EN - pull down nshutdown at the end.
521 * (d) invoke platform's chip disabling routine.
522 */
523long st_kim_stop(void *kim_data)
524{
525 long err = 0;
526 struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;
527 struct ti_st_plat_data *pdata =
528 kim_gdata->kim_pdev->dev.platform_data;
529 struct tty_struct *tty = kim_gdata->core_data->tty;
530
531 reinit_completion(&kim_gdata->ldisc_installed);
532
533 if (tty) { /* can be called before ldisc is installed */
534 /* Flush any pending characters in the driver and discipline. */
535 tty_ldisc_flush(tty);
536 tty_driver_flush_buffer(tty);
537 }
538
539 /* send uninstall notification to UIM */
540 pr_info("ldisc_install = 0");
541 kim_gdata->ldisc_install = 0;
542 sysfs_notify(&kim_gdata->kim_pdev->dev.kobj, NULL, "install");
543
544 /* wait for ldisc to be un-installed */
545 err = wait_for_completion_interruptible_timeout(
546 &kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));
547 if (!err) { /* timeout */
548 pr_err(" timed out waiting for ldisc to be un-installed");
549 err = -ETIMEDOUT;
550 }
551
552 /* By default configure BT nShutdown to LOW state */
553 gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW);
554 mdelay(1);
555 gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_HIGH);
556 mdelay(1);
557 gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW);
558
559 /* platform specific disable */
560 if (pdata->chip_disable)
561 pdata->chip_disable(kim_gdata);
562 return err;
563}
564
565/**********************************************************************/
566/* functions called from subsystems */
567/* called when debugfs entry is read from */
568
569static int show_version(struct seq_file *s, void *unused)
570{
571 struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
572 seq_printf(s, "%04X %d.%d.%d\n", kim_gdata->version.full,
573 kim_gdata->version.chip, kim_gdata->version.maj_ver,
574 kim_gdata->version.min_ver);
575 return 0;
576}
577
578static int show_list(struct seq_file *s, void *unused)
579{
580 struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
581 kim_st_list_protocols(kim_gdata->core_data, s);
582 return 0;
583}
584
585static ssize_t show_install(struct device *dev,
586 struct device_attribute *attr, char *buf)
587{
588 struct kim_data_s *kim_data = dev_get_drvdata(dev);
589 return sprintf(buf, "%d\n", kim_data->ldisc_install);
590}
591
592#ifdef DEBUG
593static ssize_t store_dev_name(struct device *dev,
594 struct device_attribute *attr, const char *buf, size_t count)
595{
596 struct kim_data_s *kim_data = dev_get_drvdata(dev);
597 pr_debug("storing dev name >%s<", buf);
598 strncpy(kim_data->dev_name, buf, count);
599 pr_debug("stored dev name >%s<", kim_data->dev_name);
600 return count;
601}
602
603static ssize_t store_baud_rate(struct device *dev,
604 struct device_attribute *attr, const char *buf, size_t count)
605{
606 struct kim_data_s *kim_data = dev_get_drvdata(dev);
607 pr_debug("storing baud rate >%s<", buf);
608 sscanf(buf, "%ld", &kim_data->baud_rate);
609 pr_debug("stored baud rate >%ld<", kim_data->baud_rate);
610 return count;
611}
612#endif /* if DEBUG */
613
614static ssize_t show_dev_name(struct device *dev,
615 struct device_attribute *attr, char *buf)
616{
617 struct kim_data_s *kim_data = dev_get_drvdata(dev);
618 return sprintf(buf, "%s\n", kim_data->dev_name);
619}
620
621static ssize_t show_baud_rate(struct device *dev,
622 struct device_attribute *attr, char *buf)
623{
624 struct kim_data_s *kim_data = dev_get_drvdata(dev);
625 return sprintf(buf, "%d\n", kim_data->baud_rate);
626}
627
628static ssize_t show_flow_cntrl(struct device *dev,
629 struct device_attribute *attr, char *buf)
630{
631 struct kim_data_s *kim_data = dev_get_drvdata(dev);
632 return sprintf(buf, "%d\n", kim_data->flow_cntrl);
633}
634
635/* structures specific for sysfs entries */
636static struct kobj_attribute ldisc_install =
637__ATTR(install, 0444, (void *)show_install, NULL);
638
639static struct kobj_attribute uart_dev_name =
640#ifdef DEBUG /* TODO: move this to debug-fs if possible */
641__ATTR(dev_name, 0644, (void *)show_dev_name, (void *)store_dev_name);
642#else
643__ATTR(dev_name, 0444, (void *)show_dev_name, NULL);
644#endif
645
646static struct kobj_attribute uart_baud_rate =
647#ifdef DEBUG /* TODO: move to debugfs */
648__ATTR(baud_rate, 0644, (void *)show_baud_rate, (void *)store_baud_rate);
649#else
650__ATTR(baud_rate, 0444, (void *)show_baud_rate, NULL);
651#endif
652
653static struct kobj_attribute uart_flow_cntrl =
654__ATTR(flow_cntrl, 0444, (void *)show_flow_cntrl, NULL);
655
656static struct attribute *uim_attrs[] = {
657 &ldisc_install.attr,
658 &uart_dev_name.attr,
659 &uart_baud_rate.attr,
660 &uart_flow_cntrl.attr,
661 NULL,
662};
663
664static struct attribute_group uim_attr_grp = {
665 .attrs = uim_attrs,
666};
667
668/**
669 * st_kim_ref - reference the core's data
670 * This references the per-ST platform device in the arch/xx/
671 * board-xx.c file.
672 * This would enable multiple such platform devices to exist
673 * on a given platform
674 */
675void st_kim_ref(struct st_data_s **core_data, int id)
676{
677 struct platform_device *pdev;
678 struct kim_data_s *kim_gdata;
679 /* get kim_gdata reference from platform device */
680 pdev = st_get_plat_device(id);
681 if (!pdev)
682 goto err;
683 kim_gdata = platform_get_drvdata(pdev);
684 if (!kim_gdata)
685 goto err;
686
687 *core_data = kim_gdata->core_data;
688 return;
689err:
690 *core_data = NULL;
691}
692
693static int kim_version_open(struct inode *i, struct file *f)
694{
695 return single_open(f, show_version, i->i_private);
696}
697
698static int kim_list_open(struct inode *i, struct file *f)
699{
700 return single_open(f, show_list, i->i_private);
701}
702
703static const struct file_operations version_debugfs_fops = {
704 /* version info */
705 .open = kim_version_open,
706 .read = seq_read,
707 .llseek = seq_lseek,
708 .release = single_release,
709};
710static const struct file_operations list_debugfs_fops = {
711 /* protocols info */
712 .open = kim_list_open,
713 .read = seq_read,
714 .llseek = seq_lseek,
715 .release = single_release,
716};
717
718/**********************************************************************/
719/* functions called from platform device driver subsystem
720 * need to have a relevant platform device entry in the platform's
721 * board-*.c file
722 */
723
724static struct dentry *kim_debugfs_dir;
725static int kim_probe(struct platform_device *pdev)
726{
727 struct kim_data_s *kim_gdata;
728 struct ti_st_plat_data *pdata = pdev->dev.platform_data;
729 int err;
730
731 if ((pdev->id != -1) && (pdev->id < MAX_ST_DEVICES)) {
732 /* multiple devices could exist */
733 st_kim_devices[pdev->id] = pdev;
734 } else {
735 /* platform's sure about existence of 1 device */
736 st_kim_devices[0] = pdev;
737 }
738
739 kim_gdata = kzalloc(sizeof(struct kim_data_s), GFP_ATOMIC);
740 if (!kim_gdata) {
741 pr_err("no mem to allocate");
742 return -ENOMEM;
743 }
744 platform_set_drvdata(pdev, kim_gdata);
745
746 err = st_core_init(&kim_gdata->core_data);
747 if (err != 0) {
748 pr_err(" ST core init failed");
749 err = -EIO;
750 goto err_core_init;
751 }
752 /* refer to itself */
753 kim_gdata->core_data->kim_data = kim_gdata;
754
755 /* Claim the chip enable nShutdown gpio from the system */
756 kim_gdata->nshutdown = pdata->nshutdown_gpio;
757 err = gpio_request(kim_gdata->nshutdown, "kim");
758 if (unlikely(err)) {
759 pr_err(" gpio %d request failed ", kim_gdata->nshutdown);
760 return err;
761 }
762
763 /* Configure nShutdown GPIO as output=0 */
764 err = gpio_direction_output(kim_gdata->nshutdown, 0);
765 if (unlikely(err)) {
766 pr_err(" unable to configure gpio %d", kim_gdata->nshutdown);
767 return err;
768 }
769 /* get reference of pdev for request_firmware
770 */
771 kim_gdata->kim_pdev = pdev;
772 init_completion(&kim_gdata->kim_rcvd);
773 init_completion(&kim_gdata->ldisc_installed);
774
775 err = sysfs_create_group(&pdev->dev.kobj, &uim_attr_grp);
776 if (err) {
777 pr_err("failed to create sysfs entries");
778 goto err_sysfs_group;
779 }
780
781 /* copying platform data */
782 strncpy(kim_gdata->dev_name, pdata->dev_name, UART_DEV_NAME_LEN);
783 kim_gdata->flow_cntrl = pdata->flow_cntrl;
784 kim_gdata->baud_rate = pdata->baud_rate;
785 pr_info("sysfs entries created\n");
786
787 kim_debugfs_dir = debugfs_create_dir("ti-st", NULL);
788 if (!kim_debugfs_dir) {
789 pr_err(" debugfs entries creation failed ");
790 return 0;
791 }
792
793 debugfs_create_file("version", S_IRUGO, kim_debugfs_dir,
794 kim_gdata, &version_debugfs_fops);
795 debugfs_create_file("protocols", S_IRUGO, kim_debugfs_dir,
796 kim_gdata, &list_debugfs_fops);
797 return 0;
798
799err_sysfs_group:
800 st_core_exit(kim_gdata->core_data);
801
802err_core_init:
803 kfree(kim_gdata);
804
805 return err;
806}
807
808static int kim_remove(struct platform_device *pdev)
809{
810 /* free the GPIOs requested */
811 struct ti_st_plat_data *pdata = pdev->dev.platform_data;
812 struct kim_data_s *kim_gdata;
813
814 kim_gdata = platform_get_drvdata(pdev);
815
816 /* Free the Bluetooth/FM/GPIO
817 * nShutdown gpio from the system
818 */
819 gpio_free(pdata->nshutdown_gpio);
820 pr_info("nshutdown GPIO Freed");
821
822 debugfs_remove_recursive(kim_debugfs_dir);
823 sysfs_remove_group(&pdev->dev.kobj, &uim_attr_grp);
824 pr_info("sysfs entries removed");
825
826 kim_gdata->kim_pdev = NULL;
827 st_core_exit(kim_gdata->core_data);
828
829 kfree(kim_gdata);
830 kim_gdata = NULL;
831 return 0;
832}
833
834static int kim_suspend(struct platform_device *pdev, pm_message_t state)
835{
836 struct ti_st_plat_data *pdata = pdev->dev.platform_data;
837
838 if (pdata->suspend)
839 return pdata->suspend(pdev, state);
840
841 return 0;
842}
843
844static int kim_resume(struct platform_device *pdev)
845{
846 struct ti_st_plat_data *pdata = pdev->dev.platform_data;
847
848 if (pdata->resume)
849 return pdata->resume(pdev);
850
851 return 0;
852}
853
854/**********************************************************************/
855/* entry point for ST KIM module, called in from ST Core */
856static struct platform_driver kim_platform_driver = {
857 .probe = kim_probe,
858 .remove = kim_remove,
859 .suspend = kim_suspend,
860 .resume = kim_resume,
861 .driver = {
862 .name = "kim",
863 },
864};
865
866module_platform_driver(kim_platform_driver);
867
868MODULE_AUTHOR("Pavan Savoy <pavan_savoy@ti.com>");
869MODULE_DESCRIPTION("Shared Transport Driver for TI BT/FM/GPS combo chips ");
870MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Shared Transport Line discipline driver Core
4 * Init Manager module responsible for GPIO control
5 * and firmware download
6 * Copyright (C) 2009-2010 Texas Instruments
7 * Author: Pavan Savoy <pavan_savoy@ti.com>
8 */
9
10#define pr_fmt(fmt) "(stk) :" fmt
11#include <linux/platform_device.h>
12#include <linux/jiffies.h>
13#include <linux/firmware.h>
14#include <linux/delay.h>
15#include <linux/wait.h>
16#include <linux/gpio.h>
17#include <linux/debugfs.h>
18#include <linux/seq_file.h>
19#include <linux/sched.h>
20#include <linux/sysfs.h>
21#include <linux/tty.h>
22
23#include <linux/skbuff.h>
24#include <linux/ti_wilink_st.h>
25#include <linux/module.h>
26
27#define MAX_ST_DEVICES 3 /* Imagine 1 on each UART for now */
28static struct platform_device *st_kim_devices[MAX_ST_DEVICES];
29
30/**********************************************************************/
31/* internal functions */
32
33/*
34 * st_get_plat_device -
35 * function which returns the reference to the platform device
36 * requested by id. As of now only 1 such device exists (id=0)
37 * the context requesting for reference can get the id to be
38 * requested by a. The protocol driver which is registering or
39 * b. the tty device which is opened.
40 */
41static struct platform_device *st_get_plat_device(int id)
42{
43 return st_kim_devices[id];
44}
45
46/*
47 * validate_firmware_response -
48 * function to return whether the firmware response was proper
49 * in case of error don't complete so that waiting for proper
50 * response times out
51 */
52static void validate_firmware_response(struct kim_data_s *kim_gdata)
53{
54 struct sk_buff *skb = kim_gdata->rx_skb;
55 if (!skb)
56 return;
57
58 /*
59 * these magic numbers are the position in the response buffer which
60 * allows us to distinguish whether the response is for the read
61 * version info. command
62 */
63 if (skb->data[2] == 0x01 && skb->data[3] == 0x01 &&
64 skb->data[4] == 0x10 && skb->data[5] == 0x00) {
65 /* fw version response */
66 memcpy(kim_gdata->resp_buffer,
67 kim_gdata->rx_skb->data,
68 kim_gdata->rx_skb->len);
69 kim_gdata->rx_state = ST_W4_PACKET_TYPE;
70 kim_gdata->rx_skb = NULL;
71 kim_gdata->rx_count = 0;
72 } else if (unlikely(skb->data[5] != 0)) {
73 pr_err("no proper response during fw download");
74 pr_err("data6 %x", skb->data[5]);
75 kfree_skb(skb);
76 return; /* keep waiting for the proper response */
77 }
78 /* becos of all the script being downloaded */
79 complete_all(&kim_gdata->kim_rcvd);
80 kfree_skb(skb);
81}
82
83/*
84 * check for data len received inside kim_int_recv
85 * most often hit the last case to update state to waiting for data
86 */
87static inline int kim_check_data_len(struct kim_data_s *kim_gdata, int len)
88{
89 register int room = skb_tailroom(kim_gdata->rx_skb);
90
91 pr_debug("len %d room %d", len, room);
92
93 if (!len) {
94 validate_firmware_response(kim_gdata);
95 } else if (len > room) {
96 /*
97 * Received packet's payload length is larger.
98 * We can't accommodate it in created skb.
99 */
100 pr_err("Data length is too large len %d room %d", len,
101 room);
102 kfree_skb(kim_gdata->rx_skb);
103 } else {
104 /*
105 * Packet header has non-zero payload length and
106 * we have enough space in created skb. Lets read
107 * payload data */
108 kim_gdata->rx_state = ST_W4_DATA;
109 kim_gdata->rx_count = len;
110 return len;
111 }
112
113 /*
114 * Change ST LL state to continue to process next
115 * packet
116 */
117 kim_gdata->rx_state = ST_W4_PACKET_TYPE;
118 kim_gdata->rx_skb = NULL;
119 kim_gdata->rx_count = 0;
120
121 return 0;
122}
123
124/*
125 * kim_int_recv - receive function called during firmware download
126 * firmware download responses on different UART drivers
127 * have been observed to come in bursts of different
128 * tty_receive and hence the logic
129 */
130static void kim_int_recv(struct kim_data_s *kim_gdata,
131 const unsigned char *data, long count)
132{
133 const unsigned char *ptr;
134 int len = 0;
135 unsigned char *plen;
136
137 pr_debug("%s", __func__);
138 /* Decode received bytes here */
139 ptr = data;
140 if (unlikely(ptr == NULL)) {
141 pr_err(" received null from TTY ");
142 return;
143 }
144
145 while (count) {
146 if (kim_gdata->rx_count) {
147 len = min_t(unsigned int, kim_gdata->rx_count, count);
148 skb_put_data(kim_gdata->rx_skb, ptr, len);
149 kim_gdata->rx_count -= len;
150 count -= len;
151 ptr += len;
152
153 if (kim_gdata->rx_count)
154 continue;
155
156 /* Check ST RX state machine , where are we? */
157 switch (kim_gdata->rx_state) {
158 /* Waiting for complete packet ? */
159 case ST_W4_DATA:
160 pr_debug("Complete pkt received");
161 validate_firmware_response(kim_gdata);
162 kim_gdata->rx_state = ST_W4_PACKET_TYPE;
163 kim_gdata->rx_skb = NULL;
164 continue;
165 /* Waiting for Bluetooth event header ? */
166 case ST_W4_HEADER:
167 plen =
168 (unsigned char *)&kim_gdata->rx_skb->data[1];
169 pr_debug("event hdr: plen 0x%02x\n", *plen);
170 kim_check_data_len(kim_gdata, *plen);
171 continue;
172 } /* end of switch */
173 } /* end of if rx_state */
174 switch (*ptr) {
175 /* Bluetooth event packet? */
176 case 0x04:
177 kim_gdata->rx_state = ST_W4_HEADER;
178 kim_gdata->rx_count = 2;
179 break;
180 default:
181 pr_info("unknown packet");
182 ptr++;
183 count--;
184 continue;
185 }
186 ptr++;
187 count--;
188 kim_gdata->rx_skb =
189 alloc_skb(1024+8, GFP_ATOMIC);
190 if (!kim_gdata->rx_skb) {
191 pr_err("can't allocate mem for new packet");
192 kim_gdata->rx_state = ST_W4_PACKET_TYPE;
193 kim_gdata->rx_count = 0;
194 return;
195 }
196 skb_reserve(kim_gdata->rx_skb, 8);
197 kim_gdata->rx_skb->cb[0] = 4;
198 kim_gdata->rx_skb->cb[1] = 0;
199
200 }
201 return;
202}
203
204static long read_local_version(struct kim_data_s *kim_gdata, char *bts_scr_name)
205{
206 unsigned short version = 0, chip = 0, min_ver = 0, maj_ver = 0;
207 static const char read_ver_cmd[] = { 0x01, 0x01, 0x10, 0x00 };
208 long timeout;
209
210 pr_debug("%s", __func__);
211
212 reinit_completion(&kim_gdata->kim_rcvd);
213 if (4 != st_int_write(kim_gdata->core_data, read_ver_cmd, 4)) {
214 pr_err("kim: couldn't write 4 bytes");
215 return -EIO;
216 }
217
218 timeout = wait_for_completion_interruptible_timeout(
219 &kim_gdata->kim_rcvd, msecs_to_jiffies(CMD_RESP_TIME));
220 if (timeout <= 0) {
221 pr_err(" waiting for ver info- timed out or received signal");
222 return timeout ? -ERESTARTSYS : -ETIMEDOUT;
223 }
224 reinit_completion(&kim_gdata->kim_rcvd);
225 /*
226 * the positions 12 & 13 in the response buffer provide with the
227 * chip, major & minor numbers
228 */
229
230 version =
231 MAKEWORD(kim_gdata->resp_buffer[12],
232 kim_gdata->resp_buffer[13]);
233 chip = (version & 0x7C00) >> 10;
234 min_ver = (version & 0x007F);
235 maj_ver = (version & 0x0380) >> 7;
236
237 if (version & 0x8000)
238 maj_ver |= 0x0008;
239
240 sprintf(bts_scr_name, "ti-connectivity/TIInit_%d.%d.%d.bts",
241 chip, maj_ver, min_ver);
242
243 /* to be accessed later via sysfs entry */
244 kim_gdata->version.full = version;
245 kim_gdata->version.chip = chip;
246 kim_gdata->version.maj_ver = maj_ver;
247 kim_gdata->version.min_ver = min_ver;
248
249 pr_info("%s", bts_scr_name);
250 return 0;
251}
252
253static void skip_change_remote_baud(unsigned char **ptr, long *len)
254{
255 unsigned char *nxt_action, *cur_action;
256 cur_action = *ptr;
257
258 nxt_action = cur_action + sizeof(struct bts_action) +
259 ((struct bts_action *) cur_action)->size;
260
261 if (((struct bts_action *) nxt_action)->type != ACTION_WAIT_EVENT) {
262 pr_err("invalid action after change remote baud command");
263 } else {
264 *ptr = *ptr + sizeof(struct bts_action) +
265 ((struct bts_action *)cur_action)->size;
266 *len = *len - (sizeof(struct bts_action) +
267 ((struct bts_action *)cur_action)->size);
268 /* warn user on not commenting these in firmware */
269 pr_warn("skipping the wait event of change remote baud");
270 }
271}
272
273/*
274 * download_firmware -
275 * internal function which parses through the .bts firmware
276 * script file intreprets SEND, DELAY actions only as of now
277 */
278static long download_firmware(struct kim_data_s *kim_gdata)
279{
280 long err = 0;
281 long len = 0;
282 unsigned char *ptr = NULL;
283 unsigned char *action_ptr = NULL;
284 unsigned char bts_scr_name[40] = { 0 }; /* 40 char long bts scr name? */
285 int wr_room_space;
286 int cmd_size;
287 unsigned long timeout;
288
289 err = read_local_version(kim_gdata, bts_scr_name);
290 if (err != 0) {
291 pr_err("kim: failed to read local ver");
292 return err;
293 }
294 err =
295 request_firmware(&kim_gdata->fw_entry, bts_scr_name,
296 &kim_gdata->kim_pdev->dev);
297 if (unlikely((err != 0) || (kim_gdata->fw_entry->data == NULL) ||
298 (kim_gdata->fw_entry->size == 0))) {
299 pr_err(" request_firmware failed(errno %ld) for %s", err,
300 bts_scr_name);
301 return -EINVAL;
302 }
303 ptr = (void *)kim_gdata->fw_entry->data;
304 len = kim_gdata->fw_entry->size;
305 /*
306 * bts_header to remove out magic number and
307 * version
308 */
309 ptr += sizeof(struct bts_header);
310 len -= sizeof(struct bts_header);
311
312 while (len > 0 && ptr) {
313 pr_debug(" action size %d, type %d ",
314 ((struct bts_action *)ptr)->size,
315 ((struct bts_action *)ptr)->type);
316
317 switch (((struct bts_action *)ptr)->type) {
318 case ACTION_SEND_COMMAND: /* action send */
319 pr_debug("S");
320 action_ptr = &(((struct bts_action *)ptr)->data[0]);
321 if (unlikely
322 (((struct hci_command *)action_ptr)->opcode ==
323 0xFF36)) {
324 /*
325 * ignore remote change
326 * baud rate HCI VS command
327 */
328 pr_warn("change remote baud"
329 " rate command in firmware");
330 skip_change_remote_baud(&ptr, &len);
331 break;
332 }
333 /*
334 * Make sure we have enough free space in uart
335 * tx buffer to write current firmware command
336 */
337 cmd_size = ((struct bts_action *)ptr)->size;
338 timeout = jiffies + msecs_to_jiffies(CMD_WR_TIME);
339 do {
340 wr_room_space =
341 st_get_uart_wr_room(kim_gdata->core_data);
342 if (wr_room_space < 0) {
343 pr_err("Unable to get free "
344 "space info from uart tx buffer");
345 release_firmware(kim_gdata->fw_entry);
346 return wr_room_space;
347 }
348 mdelay(1); /* wait 1ms before checking room */
349 } while ((wr_room_space < cmd_size) &&
350 time_before(jiffies, timeout));
351
352 /* Timeout happened ? */
353 if (time_after_eq(jiffies, timeout)) {
354 pr_err("Timeout while waiting for free "
355 "free space in uart tx buffer");
356 release_firmware(kim_gdata->fw_entry);
357 return -ETIMEDOUT;
358 }
359 /*
360 * reinit completion before sending for the
361 * relevant wait
362 */
363 reinit_completion(&kim_gdata->kim_rcvd);
364
365 /*
366 * Free space found in uart buffer, call st_int_write
367 * to send current firmware command to the uart tx
368 * buffer.
369 */
370 err = st_int_write(kim_gdata->core_data,
371 ((struct bts_action_send *)action_ptr)->data,
372 ((struct bts_action *)ptr)->size);
373 if (unlikely(err < 0)) {
374 release_firmware(kim_gdata->fw_entry);
375 return err;
376 }
377 /*
378 * Check number of bytes written to the uart tx buffer
379 * and requested command write size
380 */
381 if (err != cmd_size) {
382 pr_err("Number of bytes written to uart "
383 "tx buffer are not matching with "
384 "requested cmd write size");
385 release_firmware(kim_gdata->fw_entry);
386 return -EIO;
387 }
388 break;
389 case ACTION_WAIT_EVENT: /* wait */
390 pr_debug("W");
391 err = wait_for_completion_interruptible_timeout(
392 &kim_gdata->kim_rcvd,
393 msecs_to_jiffies(CMD_RESP_TIME));
394 if (err <= 0) {
395 pr_err("response timeout/signaled during fw download ");
396 /* timed out */
397 release_firmware(kim_gdata->fw_entry);
398 return err ? -ERESTARTSYS : -ETIMEDOUT;
399 }
400 reinit_completion(&kim_gdata->kim_rcvd);
401 break;
402 case ACTION_DELAY: /* sleep */
403 pr_info("sleep command in scr");
404 action_ptr = &(((struct bts_action *)ptr)->data[0]);
405 mdelay(((struct bts_action_delay *)action_ptr)->msec);
406 break;
407 }
408 len =
409 len - (sizeof(struct bts_action) +
410 ((struct bts_action *)ptr)->size);
411 ptr =
412 ptr + sizeof(struct bts_action) +
413 ((struct bts_action *)ptr)->size;
414 }
415 /* fw download complete */
416 release_firmware(kim_gdata->fw_entry);
417 return 0;
418}
419
420/**********************************************************************/
421/* functions called from ST core */
422/* called from ST Core, when REG_IN_PROGRESS (registration in progress)
423 * can be because of
424 * 1. response to read local version
425 * 2. during send/recv's of firmware download
426 */
427void st_kim_recv(void *disc_data, const unsigned char *data, long count)
428{
429 struct st_data_s *st_gdata = (struct st_data_s *)disc_data;
430 struct kim_data_s *kim_gdata = st_gdata->kim_data;
431
432 /*
433 * proceed to gather all data and distinguish read fw version response
434 * from other fw responses when data gathering is complete
435 */
436 kim_int_recv(kim_gdata, data, count);
437 return;
438}
439
440/*
441 * to signal completion of line discipline installation
442 * called from ST Core, upon tty_open
443 */
444void st_kim_complete(void *kim_data)
445{
446 struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;
447 complete(&kim_gdata->ldisc_installed);
448}
449
450/*
451 * st_kim_start - called from ST Core upon 1st registration
452 * This involves toggling the chip enable gpio, reading
453 * the firmware version from chip, forming the fw file name
454 * based on the chip version, requesting the fw, parsing it
455 * and perform download(send/recv).
456 */
457long st_kim_start(void *kim_data)
458{
459 long err = 0;
460 long retry = POR_RETRY_COUNT;
461 struct ti_st_plat_data *pdata;
462 struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;
463
464 pr_info(" %s", __func__);
465 pdata = kim_gdata->kim_pdev->dev.platform_data;
466
467 do {
468 /* platform specific enabling code here */
469 if (pdata->chip_enable)
470 pdata->chip_enable(kim_gdata);
471
472 /* Configure BT nShutdown to HIGH state */
473 gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW);
474 mdelay(5); /* FIXME: a proper toggle */
475 gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_HIGH);
476 mdelay(100);
477 /* re-initialize the completion */
478 reinit_completion(&kim_gdata->ldisc_installed);
479 /* send notification to UIM */
480 kim_gdata->ldisc_install = 1;
481 pr_info("ldisc_install = 1");
482 sysfs_notify(&kim_gdata->kim_pdev->dev.kobj,
483 NULL, "install");
484 /* wait for ldisc to be installed */
485 err = wait_for_completion_interruptible_timeout(
486 &kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));
487 if (!err) {
488 /*
489 * ldisc installation timeout,
490 * flush uart, power cycle BT_EN
491 */
492 pr_err("ldisc installation timeout");
493 err = st_kim_stop(kim_gdata);
494 continue;
495 } else {
496 /* ldisc installed now */
497 pr_info("line discipline installed");
498 err = download_firmware(kim_gdata);
499 if (err != 0) {
500 /*
501 * ldisc installed but fw download failed,
502 * flush uart & power cycle BT_EN
503 */
504 pr_err("download firmware failed");
505 err = st_kim_stop(kim_gdata);
506 continue;
507 } else { /* on success don't retry */
508 break;
509 }
510 }
511 } while (retry--);
512 return err;
513}
514
515/*
516 * st_kim_stop - stop communication with chip.
517 * This can be called from ST Core/KIM, on the-
518 * (a) last un-register when chip need not be powered there-after,
519 * (b) upon failure to either install ldisc or download firmware.
520 * The function is responsible to (a) notify UIM about un-installation,
521 * (b) flush UART if the ldisc was installed.
522 * (c) reset BT_EN - pull down nshutdown at the end.
523 * (d) invoke platform's chip disabling routine.
524 */
525long st_kim_stop(void *kim_data)
526{
527 long err = 0;
528 struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;
529 struct ti_st_plat_data *pdata =
530 kim_gdata->kim_pdev->dev.platform_data;
531 struct tty_struct *tty = kim_gdata->core_data->tty;
532
533 reinit_completion(&kim_gdata->ldisc_installed);
534
535 if (tty) { /* can be called before ldisc is installed */
536 /* Flush any pending characters in the driver and discipline. */
537 tty_ldisc_flush(tty);
538 tty_driver_flush_buffer(tty);
539 }
540
541 /* send uninstall notification to UIM */
542 pr_info("ldisc_install = 0");
543 kim_gdata->ldisc_install = 0;
544 sysfs_notify(&kim_gdata->kim_pdev->dev.kobj, NULL, "install");
545
546 /* wait for ldisc to be un-installed */
547 err = wait_for_completion_interruptible_timeout(
548 &kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));
549 if (!err) { /* timeout */
550 pr_err(" timed out waiting for ldisc to be un-installed");
551 err = -ETIMEDOUT;
552 }
553
554 /* By default configure BT nShutdown to LOW state */
555 gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW);
556 mdelay(1);
557 gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_HIGH);
558 mdelay(1);
559 gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW);
560
561 /* platform specific disable */
562 if (pdata->chip_disable)
563 pdata->chip_disable(kim_gdata);
564 return err;
565}
566
567/**********************************************************************/
568/* functions called from subsystems */
569/* called when debugfs entry is read from */
570
571static int version_show(struct seq_file *s, void *unused)
572{
573 struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
574 seq_printf(s, "%04X %d.%d.%d\n", kim_gdata->version.full,
575 kim_gdata->version.chip, kim_gdata->version.maj_ver,
576 kim_gdata->version.min_ver);
577 return 0;
578}
579
580static int list_show(struct seq_file *s, void *unused)
581{
582 struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
583 kim_st_list_protocols(kim_gdata->core_data, s);
584 return 0;
585}
586
587static ssize_t show_install(struct device *dev,
588 struct device_attribute *attr, char *buf)
589{
590 struct kim_data_s *kim_data = dev_get_drvdata(dev);
591 return sprintf(buf, "%d\n", kim_data->ldisc_install);
592}
593
594#ifdef DEBUG
595static ssize_t store_dev_name(struct device *dev,
596 struct device_attribute *attr, const char *buf, size_t count)
597{
598 struct kim_data_s *kim_data = dev_get_drvdata(dev);
599 pr_debug("storing dev name >%s<", buf);
600 strncpy(kim_data->dev_name, buf, count);
601 pr_debug("stored dev name >%s<", kim_data->dev_name);
602 return count;
603}
604
605static ssize_t store_baud_rate(struct device *dev,
606 struct device_attribute *attr, const char *buf, size_t count)
607{
608 struct kim_data_s *kim_data = dev_get_drvdata(dev);
609 pr_debug("storing baud rate >%s<", buf);
610 sscanf(buf, "%ld", &kim_data->baud_rate);
611 pr_debug("stored baud rate >%ld<", kim_data->baud_rate);
612 return count;
613}
614#endif /* if DEBUG */
615
616static ssize_t show_dev_name(struct device *dev,
617 struct device_attribute *attr, char *buf)
618{
619 struct kim_data_s *kim_data = dev_get_drvdata(dev);
620 return sprintf(buf, "%s\n", kim_data->dev_name);
621}
622
623static ssize_t show_baud_rate(struct device *dev,
624 struct device_attribute *attr, char *buf)
625{
626 struct kim_data_s *kim_data = dev_get_drvdata(dev);
627 return sprintf(buf, "%d\n", kim_data->baud_rate);
628}
629
630static ssize_t show_flow_cntrl(struct device *dev,
631 struct device_attribute *attr, char *buf)
632{
633 struct kim_data_s *kim_data = dev_get_drvdata(dev);
634 return sprintf(buf, "%d\n", kim_data->flow_cntrl);
635}
636
637/* structures specific for sysfs entries */
638static struct kobj_attribute ldisc_install =
639__ATTR(install, 0444, (void *)show_install, NULL);
640
641static struct kobj_attribute uart_dev_name =
642#ifdef DEBUG /* TODO: move this to debug-fs if possible */
643__ATTR(dev_name, 0644, (void *)show_dev_name, (void *)store_dev_name);
644#else
645__ATTR(dev_name, 0444, (void *)show_dev_name, NULL);
646#endif
647
648static struct kobj_attribute uart_baud_rate =
649#ifdef DEBUG /* TODO: move to debugfs */
650__ATTR(baud_rate, 0644, (void *)show_baud_rate, (void *)store_baud_rate);
651#else
652__ATTR(baud_rate, 0444, (void *)show_baud_rate, NULL);
653#endif
654
655static struct kobj_attribute uart_flow_cntrl =
656__ATTR(flow_cntrl, 0444, (void *)show_flow_cntrl, NULL);
657
658static struct attribute *uim_attrs[] = {
659 &ldisc_install.attr,
660 &uart_dev_name.attr,
661 &uart_baud_rate.attr,
662 &uart_flow_cntrl.attr,
663 NULL,
664};
665
666static const struct attribute_group uim_attr_grp = {
667 .attrs = uim_attrs,
668};
669
670/*
671 * st_kim_ref - reference the core's data
672 * This references the per-ST platform device in the arch/xx/
673 * board-xx.c file.
674 * This would enable multiple such platform devices to exist
675 * on a given platform
676 */
677void st_kim_ref(struct st_data_s **core_data, int id)
678{
679 struct platform_device *pdev;
680 struct kim_data_s *kim_gdata;
681 /* get kim_gdata reference from platform device */
682 pdev = st_get_plat_device(id);
683 if (!pdev)
684 goto err;
685 kim_gdata = platform_get_drvdata(pdev);
686 if (!kim_gdata)
687 goto err;
688
689 *core_data = kim_gdata->core_data;
690 return;
691err:
692 *core_data = NULL;
693}
694
695DEFINE_SHOW_ATTRIBUTE(version);
696DEFINE_SHOW_ATTRIBUTE(list);
697
698/**********************************************************************/
699/* functions called from platform device driver subsystem
700 * need to have a relevant platform device entry in the platform's
701 * board-*.c file
702 */
703
704static struct dentry *kim_debugfs_dir;
705static int kim_probe(struct platform_device *pdev)
706{
707 struct kim_data_s *kim_gdata;
708 struct ti_st_plat_data *pdata = pdev->dev.platform_data;
709 int err;
710
711 if ((pdev->id != -1) && (pdev->id < MAX_ST_DEVICES)) {
712 /* multiple devices could exist */
713 st_kim_devices[pdev->id] = pdev;
714 } else {
715 /* platform's sure about existence of 1 device */
716 st_kim_devices[0] = pdev;
717 }
718
719 kim_gdata = kzalloc(sizeof(struct kim_data_s), GFP_KERNEL);
720 if (!kim_gdata) {
721 pr_err("no mem to allocate");
722 return -ENOMEM;
723 }
724 platform_set_drvdata(pdev, kim_gdata);
725
726 err = st_core_init(&kim_gdata->core_data);
727 if (err != 0) {
728 pr_err(" ST core init failed");
729 err = -EIO;
730 goto err_core_init;
731 }
732 /* refer to itself */
733 kim_gdata->core_data->kim_data = kim_gdata;
734
735 /* Claim the chip enable nShutdown gpio from the system */
736 kim_gdata->nshutdown = pdata->nshutdown_gpio;
737 err = gpio_request(kim_gdata->nshutdown, "kim");
738 if (unlikely(err)) {
739 pr_err(" gpio %d request failed ", kim_gdata->nshutdown);
740 goto err_sysfs_group;
741 }
742
743 /* Configure nShutdown GPIO as output=0 */
744 err = gpio_direction_output(kim_gdata->nshutdown, 0);
745 if (unlikely(err)) {
746 pr_err(" unable to configure gpio %d", kim_gdata->nshutdown);
747 goto err_sysfs_group;
748 }
749 /* get reference of pdev for request_firmware */
750 kim_gdata->kim_pdev = pdev;
751 init_completion(&kim_gdata->kim_rcvd);
752 init_completion(&kim_gdata->ldisc_installed);
753
754 err = sysfs_create_group(&pdev->dev.kobj, &uim_attr_grp);
755 if (err) {
756 pr_err("failed to create sysfs entries");
757 goto err_sysfs_group;
758 }
759
760 /* copying platform data */
761 strncpy(kim_gdata->dev_name, pdata->dev_name, UART_DEV_NAME_LEN);
762 kim_gdata->flow_cntrl = pdata->flow_cntrl;
763 kim_gdata->baud_rate = pdata->baud_rate;
764 pr_info("sysfs entries created\n");
765
766 kim_debugfs_dir = debugfs_create_dir("ti-st", NULL);
767
768 debugfs_create_file("version", S_IRUGO, kim_debugfs_dir,
769 kim_gdata, &version_fops);
770 debugfs_create_file("protocols", S_IRUGO, kim_debugfs_dir,
771 kim_gdata, &list_fops);
772 return 0;
773
774err_sysfs_group:
775 st_core_exit(kim_gdata->core_data);
776
777err_core_init:
778 kfree(kim_gdata);
779
780 return err;
781}
782
783static int kim_remove(struct platform_device *pdev)
784{
785 /* free the GPIOs requested */
786 struct ti_st_plat_data *pdata = pdev->dev.platform_data;
787 struct kim_data_s *kim_gdata;
788
789 kim_gdata = platform_get_drvdata(pdev);
790
791 /*
792 * Free the Bluetooth/FM/GPIO
793 * nShutdown gpio from the system
794 */
795 gpio_free(pdata->nshutdown_gpio);
796 pr_info("nshutdown GPIO Freed");
797
798 debugfs_remove_recursive(kim_debugfs_dir);
799 sysfs_remove_group(&pdev->dev.kobj, &uim_attr_grp);
800 pr_info("sysfs entries removed");
801
802 kim_gdata->kim_pdev = NULL;
803 st_core_exit(kim_gdata->core_data);
804
805 kfree(kim_gdata);
806 kim_gdata = NULL;
807 return 0;
808}
809
810static int kim_suspend(struct platform_device *pdev, pm_message_t state)
811{
812 struct ti_st_plat_data *pdata = pdev->dev.platform_data;
813
814 if (pdata->suspend)
815 return pdata->suspend(pdev, state);
816
817 return 0;
818}
819
820static int kim_resume(struct platform_device *pdev)
821{
822 struct ti_st_plat_data *pdata = pdev->dev.platform_data;
823
824 if (pdata->resume)
825 return pdata->resume(pdev);
826
827 return 0;
828}
829
830/**********************************************************************/
831/* entry point for ST KIM module, called in from ST Core */
832static struct platform_driver kim_platform_driver = {
833 .probe = kim_probe,
834 .remove = kim_remove,
835 .suspend = kim_suspend,
836 .resume = kim_resume,
837 .driver = {
838 .name = "kim",
839 },
840};
841
842module_platform_driver(kim_platform_driver);
843
844MODULE_AUTHOR("Pavan Savoy <pavan_savoy@ti.com>");
845MODULE_DESCRIPTION("Shared Transport Driver for TI BT/FM/GPS combo chips ");
846MODULE_LICENSE("GPL");