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