drivers/staging/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 Texas Instruments
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #define pr_fmt(fmt) "(stk) :" fmt
  23 #include <linux/platform_device.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/firmware.h>
  26 #include <linux/delay.h>
  27 #include <linux/wait.h>
  28 #include <linux/gpio.h>
  29 #include <linux/debugfs.h>
  30 #include <linux/seq_file.h>
  31
  32 #include <linux/sched.h>
  33
  34 #include "st_kim.h"
  35 /* understand BT events for fw response */
  36 #include <net/bluetooth/bluetooth.h>
  37 #include <net/bluetooth/hci_core.h>
  38 #include <net/bluetooth/hci.h>
  39
  40
  41 static int kim_probe(struct platform_device *pdev);
  42 static int kim_remove(struct platform_device *pdev);
  43
  44 /* KIM platform device driver structure */
  45 static struct platform_driver kim_platform_driver = {
  46         .probe = kim_probe,
  47         .remove = kim_remove,
  48         /* TODO: ST driver power management during suspend/resume ?
  49          */
  50 #if 0
  51         .suspend = kim_suspend,
  52         .resume = kim_resume,
  53 #endif
  54         .driver = {
  55                    .name = "kim",
  56                    .owner = THIS_MODULE,
  57                    },
  58 };
  59
  60 static int kim_toggle_radio(void*, bool);
  61 static const struct rfkill_ops kim_rfkill_ops = {
  62         .set_block = kim_toggle_radio,
  63 };
  64
  65 /* strings to be used for rfkill entries and by
  66  * ST Core to be used for sysfs debug entry
  67  */
  68 #define PROTO_ENTRY(type, name) name
  69 const unsigned char *protocol_names[] = {
  70         PROTO_ENTRY(ST_BT, "Bluetooth"),
  71         PROTO_ENTRY(ST_FM, "FM"),
  72         PROTO_ENTRY(ST_GPS, "GPS"),
  73 };
  74
  75
  76 /**********************************************************************/
  77 /* internal functions */
  78
  79 /**
  80  * validate_firmware_response -
  81  *      function to return whether the firmware response was proper
  82  *      in case of error don't complete so that waiting for proper
  83  *      response times out
  84  */
  85 void validate_firmware_response(struct kim_data_s *kim_gdata)
  86 {
  87         struct sk_buff *skb = kim_gdata->rx_skb;
  88         if (unlikely(skb->data[5] != 0)) {
  89                 pr_err("no proper response during fw download");
  90                 pr_err("data6 %x", skb->data[5]);
  91                 return;         /* keep waiting for the proper response */
  92         }
  93         /* becos of all the script being downloaded */
  94         complete_all(&kim_gdata->kim_rcvd);
  95         kfree_skb(skb);
  96 }
  97
  98 /* check for data len received inside kim_int_recv
  99  * most often hit the last case to update state to waiting for data
 100  */
 101 static inline int kim_check_data_len(struct kim_data_s *kim_gdata, int len)
 102 {
 103         register int room = skb_tailroom(kim_gdata->rx_skb);
 104
 105         pr_debug("len %d room %d", len, room);
 106
 107         if (!len) {
 108                 validate_firmware_response(kim_gdata);
 109         } else if (len > room) {
 110                 /* Received packet's payload length is larger.
 111                  * We can't accommodate it in created skb.
 112                  */
 113                 pr_err("Data length is too large len %d room %d", len,
 114                            room);
 115                 kfree_skb(kim_gdata->rx_skb);
 116         } else {
 117                 /* Packet header has non-zero payload length and
 118                  * we have enough space in created skb. Lets read
 119                  * payload data */
 120                 kim_gdata->rx_state = ST_BT_W4_DATA;
 121                 kim_gdata->rx_count = len;
 122                 return len;
 123         }
 124
 125         /* Change ST LL state to continue to process next
 126          * packet */
 127         kim_gdata->rx_state = ST_W4_PACKET_TYPE;
 128         kim_gdata->rx_skb = NULL;
 129         kim_gdata->rx_count = 0;
 130
 131         return 0;
 132 }
 133
 134 /**
 135  * kim_int_recv - receive function called during firmware download
 136  *      firmware download responses on different UART drivers
 137  *      have been observed to come in bursts of different
 138  *      tty_receive and hence the logic
 139  */
 140 void kim_int_recv(struct kim_data_s *kim_gdata,
 141         const unsigned char *data, long count)
 142 {
 143         register char *ptr;
 144         struct hci_event_hdr *eh;
 145         register int len = 0, type = 0;
 146
 147         pr_debug("%s", __func__);
 148         /* Decode received bytes here */
 149         ptr = (char *)data;
 150         if (unlikely(ptr == NULL)) {
 151                 pr_err(" received null from TTY ");
 152                 return;
 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_BT_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_BT_W4_EVENT_HDR:
 176                                 eh = (struct hci_event_hdr *)kim_gdata->
 177                                     rx_skb->data;
 178                                 pr_debug("Event header: evt 0x%2.2x"
 179                                            "plen %d", eh->evt, eh->plen);
 180                                 kim_check_data_len(kim_gdata, eh->plen);
 181                                 continue;
 182                         }       /* end of switch */
 183                 }               /* end of if rx_state */
 184                 switch (*ptr) {
 185                         /* Bluetooth event packet? */
 186                 case HCI_EVENT_PKT:
 187                         pr_info("Event packet");
 188                         kim_gdata->rx_state = ST_BT_W4_EVENT_HDR;
 189                         kim_gdata->rx_count = HCI_EVENT_HDR_SIZE;
 190                         type = HCI_EVENT_PKT;
 191                         break;
 192                 default:
 193                         pr_info("unknown packet");
 194                         ptr++;
 195                         count--;
 196                         continue;
 197                 }
 198                 ptr++;
 199                 count--;
 200                 kim_gdata->rx_skb =
 201                     bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
 202                 if (!kim_gdata->rx_skb) {
 203                         pr_err("can't allocate mem for new packet");
 204                         kim_gdata->rx_state = ST_W4_PACKET_TYPE;
 205                         kim_gdata->rx_count = 0;
 206                         return;
 207                 }
 208                 bt_cb(kim_gdata->rx_skb)->pkt_type = type;
 209         }
 210         pr_info("done %s", __func__);
 211         return;
 212 }
 213
 214 static 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         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 -1;
 225         }
 226
 227         if (!wait_for_completion_timeout
 228             (&kim_gdata->kim_rcvd, msecs_to_jiffies(CMD_RESP_TIME))) {
 229                 pr_err(" waiting for ver info- timed out ");
 230                 return -1;
 231         }
 232
 233         version =
 234                 MAKEWORD(kim_gdata->resp_buffer[13],
 235                                 kim_gdata->resp_buffer[14]);
 236         chip = (version & 0x7C00) >> 10;
 237         min_ver = (version & 0x007F);
 238         maj_ver = (version & 0x0380) >> 7;
 239
 240         if (version & 0x8000)
 241                 maj_ver |= 0x0008;
 242
 243         sprintf(bts_scr_name, "TIInit_%d.%d.%d.bts", chip, maj_ver, min_ver);
 244
 245         /* to be accessed later via sysfs entry */
 246         kim_gdata->version.full = version;
 247         kim_gdata->version.chip = chip;
 248         kim_gdata->version.maj_ver = maj_ver;
 249         kim_gdata->version.min_ver = min_ver;
 250
 251         pr_info("%s", bts_scr_name);
 252         return 0;
 253 }
 254
 255 /**
 256  * download_firmware -
 257  *      internal function which parses through the .bts firmware
 258  *      script file intreprets SEND, DELAY actions only as of now
 259  */
 260 static long download_firmware(struct kim_data_s *kim_gdata)
 261 {
 262         long err = 0;
 263         long len = 0;
 264         register unsigned char *ptr = NULL;
 265         register unsigned char *action_ptr = NULL;
 266         unsigned char bts_scr_name[30] = { 0 }; /* 30 char long bts scr name? */
 267
 268         err = read_local_version(kim_gdata, bts_scr_name);
 269         if (err != 0) {
 270                 pr_err("kim: failed to read local ver");
 271                 return err;
 272         }
 273         err =
 274             request_firmware(&kim_gdata->fw_entry, bts_scr_name,
 275                              &kim_gdata->kim_pdev->dev);
 276         if (unlikely((err != 0) || (kim_gdata->fw_entry->data == NULL) ||
 277                      (kim_gdata->fw_entry->size == 0))) {
 278                 pr_err(" request_firmware failed(errno %ld) for %s", err,
 279                            bts_scr_name);
 280                 return -1;
 281         }
 282         ptr = (void *)kim_gdata->fw_entry->data;
 283         len = kim_gdata->fw_entry->size;
 284         /* bts_header to remove out magic number and
 285          * version
 286          */
 287         ptr += sizeof(struct bts_header);
 288         len -= sizeof(struct bts_header);
 289
 290         while (len > 0 && ptr) {
 291                 pr_debug(" action size %d, type %d ",
 292                            ((struct bts_action *)ptr)->size,
 293                            ((struct bts_action *)ptr)->type);
 294
 295                 switch (((struct bts_action *)ptr)->type) {
 296                 case ACTION_SEND_COMMAND:       /* action send */
 297                         action_ptr = &(((struct bts_action *)ptr)->data[0]);
 298                         if (unlikely
 299                             (((struct hci_command *)action_ptr)->opcode ==
 300                              0xFF36)) {
 301                                 /* ignore remote change
 302                                  * baud rate HCI VS command */
 303                                 pr_err
 304                                     (" change remote baud"
 305                                     " rate command in firmware");
 306                                 break;
 307                         }
 308
 309                         INIT_COMPLETION(kim_gdata->kim_rcvd);
 310                         err = st_int_write(kim_gdata->core_data,
 311                         ((struct bts_action_send *)action_ptr)->data,
 312                                            ((struct bts_action *)ptr)->size);
 313                         if (unlikely(err < 0)) {
 314                                 release_firmware(kim_gdata->fw_entry);
 315                                 return -1;
 316                         }
 317                         if (!wait_for_completion_timeout
 318                             (&kim_gdata->kim_rcvd,
 319                              msecs_to_jiffies(CMD_RESP_TIME))) {
 320                                 pr_err
 321                                     (" response timeout during fw download ");
 322                                 /* timed out */
 323                                 release_firmware(kim_gdata->fw_entry);
 324                                 return -1;
 325                         }
 326                         break;
 327                 case ACTION_DELAY:      /* sleep */
 328                         pr_info("sleep command in scr");
 329                         action_ptr = &(((struct bts_action *)ptr)->data[0]);
 330                         mdelay(((struct bts_action_delay *)action_ptr)->msec);
 331                         break;
 332                 }
 333                 len =
 334                     len - (sizeof(struct bts_action) +
 335                            ((struct bts_action *)ptr)->size);
 336                 ptr =
 337                     ptr + sizeof(struct bts_action) +
 338                     ((struct bts_action *)ptr)->size;
 339         }
 340         /* fw download complete */
 341         release_firmware(kim_gdata->fw_entry);
 342         return 0;
 343 }
 344
 345 /**********************************************************************/
 346 /* functions called from ST core */
 347 /* function to toggle the GPIO
 348  * needs to know whether the GPIO is active high or active low
 349  */
 350 void st_kim_chip_toggle(enum proto_type type, enum kim_gpio_state state)
 351 {
 352         struct platform_device  *kim_pdev;
 353         struct kim_data_s       *kim_gdata;
 354         pr_info(" %s ", __func__);
 355
 356         kim_pdev = st_get_plat_device();
 357         kim_gdata = dev_get_drvdata(&kim_pdev->dev);
 358
 359         if (kim_gdata->gpios[type] == -1) {
 360                 pr_info(" gpio not requested for protocol %s",
 361                            protocol_names[type]);
 362                 return;
 363         }
 364         switch (type) {
 365         case ST_BT:
 366                 /*Do Nothing */
 367                 break;
 368
 369         case ST_FM:
 370                 if (state == KIM_GPIO_ACTIVE)
 371                         gpio_set_value(kim_gdata->gpios[ST_FM], GPIO_LOW);
 372                 else
 373                         gpio_set_value(kim_gdata->gpios[ST_FM], GPIO_HIGH);
 374                 break;
 375
 376         case ST_GPS:
 377                 if (state == KIM_GPIO_ACTIVE)
 378                         gpio_set_value(kim_gdata->gpios[ST_GPS], GPIO_HIGH);
 379                 else
 380                         gpio_set_value(kim_gdata->gpios[ST_GPS], GPIO_LOW);
 381                 break;
 382
 383         case ST_MAX:
 384         default:
 385                 break;
 386         }
 387
 388         return;
 389 }
 390
 391 /* called from ST Core, when REG_IN_PROGRESS (registration in progress)
 392  * can be because of
 393  * 1. response to read local version
 394  * 2. during send/recv's of firmware download
 395  */
 396 void st_kim_recv(void *disc_data, const unsigned char *data, long count)
 397 {
 398         struct st_data_s        *st_gdata = (struct st_data_s *)disc_data;
 399         struct kim_data_s       *kim_gdata = st_gdata->kim_data;
 400
 401         pr_info(" %s ", __func__);
 402         /* copy to local buffer */
 403         if (unlikely(data[4] == 0x01 && data[5] == 0x10 && data[0] == 0x04)) {
 404                 /* must be the read_ver_cmd */
 405                 memcpy(kim_gdata->resp_buffer, data, count);
 406                 complete_all(&kim_gdata->kim_rcvd);
 407                 return;
 408         } else {
 409                 kim_int_recv(kim_gdata, data, count);
 410                 /* either completes or times out */
 411         }
 412         return;
 413 }
 414
 415 /* to signal completion of line discipline installation
 416  * called from ST Core, upon tty_open
 417  */
 418 void st_kim_complete(void *kim_data)
 419 {
 420         struct kim_data_s       *kim_gdata = (struct kim_data_s *)kim_data;
 421         complete(&kim_gdata->ldisc_installed);
 422 }
 423
 424 /**
 425  * st_kim_start - called from ST Core upon 1st registration
 426  *      This involves toggling the chip enable gpio, reading
 427  *      the firmware version from chip, forming the fw file name
 428  *      based on the chip version, requesting the fw, parsing it
 429  *      and perform download(send/recv).
 430  */
 431 long st_kim_start(void *kim_data)
 432 {
 433         long err = 0;
 434         long retry = POR_RETRY_COUNT;
 435         struct kim_data_s       *kim_gdata = (struct kim_data_s *)kim_data;
 436
 437         pr_info(" %s", __func__);
 438
 439         do {
 440                 /* TODO: this is only because rfkill sub-system
 441                  * doesn't send events to user-space if the state
 442                  * isn't changed
 443                  */
 444                 rfkill_set_hw_state(kim_gdata->rfkill[ST_BT], 1);
 445                 /* Configure BT nShutdown to HIGH state */
 446                 gpio_set_value(kim_gdata->gpios[ST_BT], GPIO_LOW);
 447                 mdelay(5);      /* FIXME: a proper toggle */
 448                 gpio_set_value(kim_gdata->gpios[ST_BT], GPIO_HIGH);
 449                 mdelay(100);
 450                 /* re-initialize the completion */
 451                 INIT_COMPLETION(kim_gdata->ldisc_installed);
 452 #if 0 /* older way of signalling user-space UIM */
 453                 /* send signal to UIM */
 454                 err = kill_pid(find_get_pid(kim_gdata->uim_pid), SIGUSR2, 0);
 455                 if (err != 0) {
 456                         pr_info(" sending SIGUSR2 to uim failed %ld", err);
 457                         err = -1;
 458                         continue;
 459                 }
 460 #endif
 461                 /* unblock and send event to UIM via /dev/rfkill */
 462                 rfkill_set_hw_state(kim_gdata->rfkill[ST_BT], 0);
 463                 /* wait for ldisc to be installed */
 464                 err = wait_for_completion_timeout(&kim_gdata->ldisc_installed,
 465                                 msecs_to_jiffies(LDISC_TIME));
 466                 if (!err) {     /* timeout */
 467                         pr_err("line disc installation timed out ");
 468                         err = -1;
 469                         continue;
 470                 } else {
 471                         /* ldisc installed now */
 472                         pr_info(" line discipline installed ");
 473                         err = download_firmware(kim_gdata);
 474                         if (err != 0) {
 475                                 pr_err("download firmware failed");
 476                                 continue;
 477                         } else {        /* on success don't retry */
 478                                 break;
 479                         }
 480                 }
 481         } while (retry--);
 482         return err;
 483 }
 484
 485 /**
 486  * st_kim_stop - called from ST Core, on the last un-registration
 487  *      toggle low the chip enable gpio
 488  */
 489 long st_kim_stop(void *kim_data)
 490 {
 491         long err = 0;
 492         struct kim_data_s       *kim_gdata = (struct kim_data_s *)kim_data;
 493
 494         INIT_COMPLETION(kim_gdata->ldisc_installed);
 495 #if 0 /* older way of signalling user-space UIM */
 496         /* send signal to UIM */
 497         err = kill_pid(find_get_pid(kim_gdata->uim_pid), SIGUSR2, 1);
 498         if (err != 0) {
 499                 pr_err("sending SIGUSR2 to uim failed %ld", err);
 500                 return -1;
 501         }
 502 #endif
 503         /* set BT rfkill to be blocked */
 504         err = rfkill_set_hw_state(kim_gdata->rfkill[ST_BT], 1);
 505
 506         /* wait for ldisc to be un-installed */
 507         err = wait_for_completion_timeout(&kim_gdata->ldisc_installed,
 508                         msecs_to_jiffies(LDISC_TIME));
 509         if (!err) {             /* timeout */
 510                 pr_err(" timed out waiting for ldisc to be un-installed");
 511                 return -1;
 512         }
 513
 514         /* By default configure BT nShutdown to LOW state */
 515         gpio_set_value(kim_gdata->gpios[ST_BT], GPIO_LOW);
 516         mdelay(1);
 517         gpio_set_value(kim_gdata->gpios[ST_BT], GPIO_HIGH);
 518         mdelay(1);
 519         gpio_set_value(kim_gdata->gpios[ST_BT], GPIO_LOW);
 520         return err;
 521 }
 522
 523 /**********************************************************************/
 524 /* functions called from subsystems */
 525 /* called when debugfs entry is read from */
 526
 527 static int show_version(struct seq_file *s, void *unused)
 528 {
 529         struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
 530         seq_printf(s, "%04X %d.%d.%d\n", kim_gdata->version.full,
 531                         kim_gdata->version.chip, kim_gdata->version.maj_ver,
 532                         kim_gdata->version.min_ver);
 533         return 0;
 534 }
 535
 536 static int show_list(struct seq_file *s, void *unused)
 537 {
 538         struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
 539         kim_st_list_protocols(kim_gdata->core_data, s);
 540         return 0;
 541 }
 542
 543 /* function called from rfkill subsystem, when someone from
 544  * user space would write 0/1 on the sysfs entry
 545  * /sys/class/rfkill/rfkill0,1,3/state
 546  */
 547 static int kim_toggle_radio(void *data, bool blocked)
 548 {
 549         enum proto_type type = *((enum proto_type *)data);
 550         pr_debug(" %s: %d ", __func__, type);
 551
 552         switch (type) {
 553         case ST_BT:
 554                 /* do nothing */
 555         break;
 556         case ST_FM:
 557         case ST_GPS:
 558                 if (blocked)
 559                         st_kim_chip_toggle(type, KIM_GPIO_INACTIVE);
 560                 else
 561                         st_kim_chip_toggle(type, KIM_GPIO_ACTIVE);
 562         break;
 563         case ST_MAX:
 564                 pr_err(" wrong proto type ");
 565         break;
 566         }
 567         return 0;
 568 }
 569
 570 /**
 571  * st_kim_ref - reference the core's data
 572  *      This references the per-ST platform device in the arch/xx/
 573  *      board-xx.c file.
 574  *      This would enable multiple such platform devices to exist
 575  *      on a given platform
 576  */
 577 void st_kim_ref(struct st_data_s **core_data)
 578 {
 579         struct platform_device  *pdev;
 580         struct kim_data_s       *kim_gdata;
 581         /* get kim_gdata reference from platform device */
 582         pdev = st_get_plat_device();
 583         kim_gdata = dev_get_drvdata(&pdev->dev);
 584         *core_data = kim_gdata->core_data;
 585 }
 586
 587 static int kim_version_open(struct inode *i, struct file *f)
 588 {
 589         return single_open(f, show_version, i->i_private);
 590 }
 591
 592 static int kim_list_open(struct inode *i, struct file *f)
 593 {
 594         return single_open(f, show_list, i->i_private);
 595 }
 596
 597 static const struct file_operations version_debugfs_fops = {
 598         /* version info */
 599         .open = kim_version_open,
 600         .read = seq_read,
 601         .llseek = seq_lseek,
 602         .release = single_release,
 603 };
 604 static const struct file_operations list_debugfs_fops = {
 605         /* protocols info */
 606         .open = kim_list_open,
 607         .read = seq_read,
 608         .llseek = seq_lseek,
 609         .release = single_release,
 610 };
 611
 612 /**********************************************************************/
 613 /* functions called from platform device driver subsystem
 614  * need to have a relevant platform device entry in the platform's
 615  * board-*.c file
 616  */
 617
 618 struct dentry *kim_debugfs_dir;
 619 static int kim_probe(struct platform_device *pdev)
 620 {
 621         long status;
 622         long proto;
 623         long *gpios = pdev->dev.platform_data;
 624         struct kim_data_s       *kim_gdata;
 625
 626         kim_gdata = kzalloc(sizeof(struct kim_data_s), GFP_ATOMIC);
 627         if (!kim_gdata) {
 628                 pr_err("no mem to allocate");
 629                 return -ENOMEM;
 630         }
 631         dev_set_drvdata(&pdev->dev, kim_gdata);
 632
 633         status = st_core_init(&kim_gdata->core_data);
 634         if (status != 0) {
 635                 pr_err(" ST core init failed");
 636                 return -1;
 637         }
 638         /* refer to itself */
 639         kim_gdata->core_data->kim_data = kim_gdata;
 640
 641         for (proto = 0; proto < ST_MAX; proto++) {
 642                 kim_gdata->gpios[proto] = gpios[proto];
 643                 pr_info(" %ld gpio to be requested", gpios[proto]);
 644         }
 645
 646         for (proto = 0; (proto < ST_MAX) && (gpios[proto] != -1); proto++) {
 647                 /* Claim the Bluetooth/FM/GPIO
 648                  * nShutdown gpio from the system
 649                  */
 650                 status = gpio_request(gpios[proto], "kim");
 651                 if (unlikely(status)) {
 652                         pr_err(" gpio %ld request failed ", gpios[proto]);
 653                         proto -= 1;
 654                         while (proto >= 0) {
 655                                 if (gpios[proto] != -1)
 656                                         gpio_free(gpios[proto]);
 657                         }
 658                         return status;
 659                 }
 660
 661                 /* Configure nShutdown GPIO as output=0 */
 662                 status =
 663                     gpio_direction_output(gpios[proto], 0);
 664                 if (unlikely(status)) {
 665                         pr_err(" unable to configure gpio %ld",
 666                                    gpios[proto]);
 667                         proto -= 1;
 668                         while (proto >= 0) {
 669                                 if (gpios[proto] != -1)
 670                                         gpio_free(gpios[proto]);
 671                         }
 672                         return status;
 673                 }
 674         }
 675         /* get reference of pdev for request_firmware
 676          */
 677         kim_gdata->kim_pdev = pdev;
 678         init_completion(&kim_gdata->kim_rcvd);
 679         init_completion(&kim_gdata->ldisc_installed);
 680
 681         for (proto = 0; (proto < ST_MAX) && (gpios[proto] != -1); proto++) {
 682                 /* TODO: should all types be rfkill_type_bt ? */
 683                 kim_gdata->rf_protos[proto] = proto;
 684                 kim_gdata->rfkill[proto] = rfkill_alloc(protocol_names[proto],
 685                         &pdev->dev, RFKILL_TYPE_BLUETOOTH,
 686                         &kim_rfkill_ops, &kim_gdata->rf_protos[proto]);
 687                 if (kim_gdata->rfkill[proto] == NULL) {
 688                         pr_err("cannot create rfkill entry for gpio %ld",
 689                                    gpios[proto]);
 690                         continue;
 691                 }
 692                 /* block upon creation */
 693                 rfkill_init_sw_state(kim_gdata->rfkill[proto], 1);
 694                 status = rfkill_register(kim_gdata->rfkill[proto]);
 695                 if (unlikely(status)) {
 696                         pr_err("rfkill registration failed for gpio %ld",
 697                                    gpios[proto]);
 698                         rfkill_unregister(kim_gdata->rfkill[proto]);
 699                         continue;
 700                 }
 701                 pr_info("rfkill entry created for %ld", gpios[proto]);
 702         }
 703
 704         kim_debugfs_dir = debugfs_create_dir("ti-st", NULL);
 705         if (IS_ERR(kim_debugfs_dir)) {
 706                 pr_err(" debugfs entries creation failed ");
 707                 kim_debugfs_dir = NULL;
 708                 return -1;
 709         }
 710
 711         debugfs_create_file("version", S_IRUGO, kim_debugfs_dir,
 712                                 kim_gdata, &version_debugfs_fops);
 713         debugfs_create_file("protocols", S_IRUGO, kim_debugfs_dir,
 714                                 kim_gdata, &list_debugfs_fops);
 715         pr_info(" debugfs entries created ");
 716         return 0;
 717 }
 718
 719 static int kim_remove(struct platform_device *pdev)
 720 {
 721         /* free the GPIOs requested
 722          */
 723         long *gpios = pdev->dev.platform_data;
 724         long proto;
 725         struct kim_data_s       *kim_gdata;
 726
 727         kim_gdata = dev_get_drvdata(&pdev->dev);
 728
 729         for (proto = 0; (proto < ST_MAX) && (gpios[proto] != -1); proto++) {
 730                 /* Claim the Bluetooth/FM/GPIO
 731                  * nShutdown gpio from the system
 732                  */
 733                 gpio_free(gpios[proto]);
 734                 rfkill_unregister(kim_gdata->rfkill[proto]);
 735                 rfkill_destroy(kim_gdata->rfkill[proto]);
 736                 kim_gdata->rfkill[proto] = NULL;
 737         }
 738         pr_info("kim: GPIO Freed");
 739         debugfs_remove_recursive(kim_debugfs_dir);
 740         kim_gdata->kim_pdev = NULL;
 741         st_core_exit(kim_gdata->core_data);
 742
 743         kfree(kim_gdata);
 744         kim_gdata = NULL;
 745         return 0;
 746 }
 747
 748 /**********************************************************************/
 749 /* entry point for ST KIM module, called in from ST Core */
 750
 751 static int __init st_kim_init(void)
 752 {
 753         long ret = 0;
 754         ret = platform_driver_register(&kim_platform_driver);
 755         if (ret != 0) {
 756                 pr_err("platform drv registration failed");
 757                 return -1;
 758         }
 759         return 0;
 760 }
 761
 762 static void __exit st_kim_deinit(void)
 763 {
 764         /* the following returns void */
 765         platform_driver_unregister(&kim_platform_driver);
 766 }
 767
 768
 769 module_init(st_kim_init);
 770 module_exit(st_kim_deinit);
 771 MODULE_AUTHOR("Pavan Savoy <pavan_savoy@ti.com>");
 772 MODULE_DESCRIPTION("Shared Transport Driver for TI BT/FM/GPS combo chips ");
 773 MODULE_LICENSE("GPL");