kernel/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 #define MAX_ST_DEVICES  3       /* Imagine 1 on each UART for now */
  41 static 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  */
  54 static 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  */
  65 static 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  */
  99 static 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  */
 138 static 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
 213 static 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
 261 static 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  */
 286 static 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  */
 431 void 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  */
 446 void 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  */
 459 long 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  */
 523 long 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
 569 static 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
 578 static 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
 585 static 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
 593 static 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
 603 static 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
 614 static 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
 621 static 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
 628 static 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 */
 636 static struct kobj_attribute ldisc_install =
 637 __ATTR(install, 0444, (void *)show_install, NULL);
 638
 639 static 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
 646 static 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
 653 static struct kobj_attribute uart_flow_cntrl =
 654 __ATTR(flow_cntrl, 0444, (void *)show_flow_cntrl, NULL);
 655
 656 static 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
 664 static 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  */
 675 void 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;
 689 err:
 690         *core_data = NULL;
 691 }
 692
 693 static int kim_version_open(struct inode *i, struct file *f)
 694 {
 695         return single_open(f, show_version, i->i_private);
 696 }
 697
 698 static int kim_list_open(struct inode *i, struct file *f)
 699 {
 700         return single_open(f, show_list, i->i_private);
 701 }
 702
 703 static 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 };
 710 static 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
 724 static struct dentry *kim_debugfs_dir;
 725 static 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
 799 err_sysfs_group:
 800         st_core_exit(kim_gdata->core_data);
 801
 802 err_core_init:
 803         kfree(kim_gdata);
 804
 805         return err;
 806 }
 807
 808 static 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
 834 static 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
 844 static 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 */
 856 static 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
 866 module_platform_driver(kim_platform_driver);
 867
 868 MODULE_AUTHOR("Pavan Savoy <pavan_savoy@ti.com>");
 869 MODULE_DESCRIPTION("Shared Transport Driver for TI BT/FM/GPS combo chips ");
 870 MODULE_LICENSE("GPL");