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