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