drivers/misc/ti-st/st_kim.c

   1 /*
   2  *  Shared Transport Line discipline driver Core
   3  *      Init Manager module responsible for GPIO control
   4  *      and firmware download
   5  *  Copyright (C) 2009-2010 Texas Instruments
   6  *  Author: Pavan Savoy <pavan_savoy@ti.com>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License version 2 as
  10  *  published by the Free Software Foundation.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  */
  22
  23 #define pr_fmt(fmt) "(stk) :" fmt
  24 #include <linux/platform_device.h>
  25 #include <linux/jiffies.h>
  26 #include <linux/firmware.h>
  27 #include <linux/delay.h>
  28 #include <linux/wait.h>
  29 #include <linux/gpio.h>
  30 #include <linux/debugfs.h>
  31 #include <linux/seq_file.h>
  32 #include <linux/sched.h>
  33 #include <linux/sysfs.h>
  34 #include <linux/tty.h>
  35
  36 #include <linux/skbuff.h>
  37 #include <linux/ti_wilink_st.h>
  38 #include <linux/module.h>
  39
  40
  41 #define MAX_ST_DEVICES  3       /* Imagine 1 on each UART for now */
  42 static struct platform_device *st_kim_devices[MAX_ST_DEVICES];
  43
  44 /**********************************************************************/
  45 /* internal functions */
  46
  47 /**
  48  * st_get_plat_device -
  49  *      function which returns the reference to the platform device
  50  *      requested by id. As of now only 1 such device exists (id=0)
  51  *      the context requesting for reference can get the id to be
  52  *      requested by a. The protocol driver which is registering or
  53  *      b. the tty device which is opened.
  54  */
  55 static struct platform_device *st_get_plat_device(int id)
  56 {
  57         return st_kim_devices[id];
  58 }
  59
  60 /**
  61  * validate_firmware_response -
  62  *      function to return whether the firmware response was proper
  63  *      in case of error don't complete so that waiting for proper
  64  *      response times out
  65  */
  66 static void validate_firmware_response(struct kim_data_s *kim_gdata)
  67 {
  68         struct sk_buff *skb = kim_gdata->rx_skb;
  69         if (!skb)
  70                 return;
  71
  72         /* these magic numbers are the position in the response buffer which
  73          * allows us to distinguish whether the response is for the read
  74          * version info. command
  75          */
  76         if (skb->data[2] == 0x01 && skb->data[3] == 0x01 &&
  77                         skb->data[4] == 0x10 && skb->data[5] == 0x00) {
  78                 /* fw version response */
  79                 memcpy(kim_gdata->resp_buffer,
  80                                 kim_gdata->rx_skb->data,
  81                                 kim_gdata->rx_skb->len);
  82                 complete_all(&kim_gdata->kim_rcvd);
  83                 kim_gdata->rx_state = ST_W4_PACKET_TYPE;
  84                 kim_gdata->rx_skb = NULL;
  85                 kim_gdata->rx_count = 0;
  86         } else if (unlikely(skb->data[5] != 0)) {
  87                 pr_err("no proper response during fw download");
  88                 pr_err("data6 %x", skb->data[5]);
  89                 kfree_skb(skb);
  90                 return;         /* keep waiting for the proper response */
  91         }
  92         /* becos of all the script being downloaded */
  93         complete_all(&kim_gdata->kim_rcvd);
  94         kfree_skb(skb);
  95 }
  96
  97 /* check for data len received inside kim_int_recv
  98  * most often hit the last case to update state to waiting for data
  99  */
 100 static inline int kim_check_data_len(struct kim_data_s *kim_gdata, int len)
 101 {
 102         register int room = skb_tailroom(kim_gdata->rx_skb);
 103
 104         pr_debug("len %d room %d", len, room);
 105
 106         if (!len) {
 107                 validate_firmware_response(kim_gdata);
 108         } else if (len > room) {
 109                 /* Received packet's payload length is larger.
 110                  * We can't accommodate it in created skb.
 111                  */
 112                 pr_err("Data length is too large len %d room %d", len,
 113                            room);
 114                 kfree_skb(kim_gdata->rx_skb);
 115         } else {
 116                 /* Packet header has non-zero payload length and
 117                  * we have enough space in created skb. Lets read
 118                  * payload data */
 119                 kim_gdata->rx_state = ST_W4_DATA;
 120                 kim_gdata->rx_count = len;
 121                 return len;
 122         }
 123
 124         /* Change ST LL state to continue to process next
 125          * packet */
 126         kim_gdata->rx_state = ST_W4_PACKET_TYPE;
 127         kim_gdata->rx_skb = NULL;
 128         kim_gdata->rx_count = 0;
 129
 130         return 0;
 131 }
 132
 133 /**
 134  * kim_int_recv - receive function called during firmware download
 135  *      firmware download responses on different UART drivers
 136  *      have been observed to come in bursts of different
 137  *      tty_receive and hence the logic
 138  */
 139 static void kim_int_recv(struct kim_data_s *kim_gdata,
 140         const unsigned char *data, long count)
 141 {
 142         const unsigned char *ptr;
 143         int len = 0, type = 0;
 144         unsigned char *plen;
 145
 146         pr_debug("%s", __func__);
 147         /* Decode received bytes here */
 148         ptr = data;
 149         if (unlikely(ptr == NULL)) {
 150                 pr_err(" received null from TTY ");
 151                 return;
 152         }
 153
 154         while (count) {
 155                 if (kim_gdata->rx_count) {
 156                         len = min_t(unsigned int, kim_gdata->rx_count, count);
 157                         memcpy(skb_put(kim_gdata->rx_skb, len), ptr, len);
 158                         kim_gdata->rx_count -= len;
 159                         count -= len;
 160                         ptr += len;
 161
 162                         if (kim_gdata->rx_count)
 163                                 continue;
 164
 165                         /* Check ST RX state machine , where are we? */
 166                         switch (kim_gdata->rx_state) {
 167                                 /* Waiting for complete packet ? */
 168                         case ST_W4_DATA:
 169                                 pr_debug("Complete pkt received");
 170                                 validate_firmware_response(kim_gdata);
 171                                 kim_gdata->rx_state = ST_W4_PACKET_TYPE;
 172                                 kim_gdata->rx_skb = NULL;
 173                                 continue;
 174                                 /* Waiting for Bluetooth event header ? */
 175                         case ST_W4_HEADER:
 176                                 plen =
 177                                 (unsigned char *)&kim_gdata->rx_skb->data[1];
 178                                 pr_debug("event hdr: plen 0x%02x\n", *plen);
 179                                 kim_check_data_len(kim_gdata, *plen);
 180                                 continue;
 181                         }       /* end of switch */
 182                 }               /* end of if rx_state */
 183                 switch (*ptr) {
 184                         /* Bluetooth event packet? */
 185                 case 0x04:
 186                         kim_gdata->rx_state = ST_W4_HEADER;
 187                         kim_gdata->rx_count = 2;
 188                         type = *ptr;
 189                         break;
 190                 default:
 191                         pr_info("unknown packet");
 192                         ptr++;
 193                         count--;
 194                         continue;
 195                 }
 196                 ptr++;
 197                 count--;
 198                 kim_gdata->rx_skb =
 199                         alloc_skb(1024+8, GFP_ATOMIC);
 200                 if (!kim_gdata->rx_skb) {
 201                         pr_err("can't allocate mem for new packet");
 202                         kim_gdata->rx_state = ST_W4_PACKET_TYPE;
 203                         kim_gdata->rx_count = 0;
 204                         return;
 205                 }
 206                 skb_reserve(kim_gdata->rx_skb, 8);
 207                 kim_gdata->rx_skb->cb[0] = 4;
 208                 kim_gdata->rx_skb->cb[1] = 0;
 209
 210         }
 211         return;
 212 }
 213
 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         const char read_ver_cmd[] = { 0x01, 0x01, 0x10, 0x00 };
 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         if (!wait_for_completion_interruptible_timeout(
 228                 &kim_gdata->kim_rcvd, msecs_to_jiffies(CMD_RESP_TIME))) {
 229                 pr_err(" waiting for ver info- timed out ");
 230                 return -ETIMEDOUT;
 231         }
 232         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, "TIInit_%d.%d.%d.bts", chip, maj_ver, min_ver);
 248
 249         /* to be accessed later via sysfs entry */
 250         kim_gdata->version.full = version;
 251         kim_gdata->version.chip = chip;
 252         kim_gdata->version.maj_ver = maj_ver;
 253         kim_gdata->version.min_ver = min_ver;
 254
 255         pr_info("%s", bts_scr_name);
 256         return 0;
 257 }
 258
 259 static void skip_change_remote_baud(unsigned char **ptr, long *len)
 260 {
 261         unsigned char *nxt_action, *cur_action;
 262         cur_action = *ptr;
 263
 264         nxt_action = cur_action + sizeof(struct bts_action) +
 265                 ((struct bts_action *) cur_action)->size;
 266
 267         if (((struct bts_action *) nxt_action)->type != ACTION_WAIT_EVENT) {
 268                 pr_err("invalid action after change remote baud command");
 269         } else {
 270                 *ptr = *ptr + sizeof(struct bts_action) +
 271                         ((struct bts_action *)cur_action)->size;
 272                 *len = *len - (sizeof(struct bts_action) +
 273                                 ((struct bts_action *)cur_action)->size);
 274                 /* warn user on not commenting these in firmware */
 275                 pr_warn("skipping the wait event of change remote baud");
 276         }
 277 }
 278
 279 /**
 280  * download_firmware -
 281  *      internal function which parses through the .bts firmware
 282  *      script file intreprets SEND, DELAY actions only as of now
 283  */
 284 static long download_firmware(struct kim_data_s *kim_gdata)
 285 {
 286         long err = 0;
 287         long len = 0;
 288         unsigned char *ptr = NULL;
 289         unsigned char *action_ptr = NULL;
 290         unsigned char bts_scr_name[30] = { 0 }; /* 30 char long bts scr name? */
 291         int wr_room_space;
 292         int cmd_size;
 293         unsigned long timeout;
 294
 295         err = read_local_version(kim_gdata, bts_scr_name);
 296         if (err != 0) {
 297                 pr_err("kim: failed to read local ver");
 298                 return err;
 299         }
 300         err =
 301             request_firmware(&kim_gdata->fw_entry, bts_scr_name,
 302                              &kim_gdata->kim_pdev->dev);
 303         if (unlikely((err != 0) || (kim_gdata->fw_entry->data == NULL) ||
 304                      (kim_gdata->fw_entry->size == 0))) {
 305                 pr_err(" request_firmware failed(errno %ld) for %s", err,
 306                            bts_scr_name);
 307                 return -EINVAL;
 308         }
 309         ptr = (void *)kim_gdata->fw_entry->data;
 310         len = kim_gdata->fw_entry->size;
 311         /* bts_header to remove out magic number and
 312          * version
 313          */
 314         ptr += sizeof(struct bts_header);
 315         len -= sizeof(struct bts_header);
 316
 317         while (len > 0 && ptr) {
 318                 pr_debug(" action size %d, type %d ",
 319                            ((struct bts_action *)ptr)->size,
 320                            ((struct bts_action *)ptr)->type);
 321
 322                 switch (((struct bts_action *)ptr)->type) {
 323                 case ACTION_SEND_COMMAND:       /* action send */
 324                         pr_debug("S");
 325                         action_ptr = &(((struct bts_action *)ptr)->data[0]);
 326                         if (unlikely
 327                             (((struct hci_command *)action_ptr)->opcode ==
 328                              0xFF36)) {
 329                                 /* ignore remote change
 330                                  * baud rate HCI VS command */
 331                                 pr_warn("change remote baud"
 332                                     " rate command in firmware");
 333                                 skip_change_remote_baud(&ptr, &len);
 334                                 break;
 335                         }
 336                         /*
 337                          * Make sure we have enough free space in uart
 338                          * tx buffer to write current firmware command
 339                          */
 340                         cmd_size = ((struct bts_action *)ptr)->size;
 341                         timeout = jiffies + msecs_to_jiffies(CMD_WR_TIME);
 342                         do {
 343                                 wr_room_space =
 344                                         st_get_uart_wr_room(kim_gdata->core_data);
 345                                 if (wr_room_space < 0) {
 346                                         pr_err("Unable to get free "
 347                                                         "space info from uart tx buffer");
 348                                         release_firmware(kim_gdata->fw_entry);
 349                                         return wr_room_space;
 350                                 }
 351                                 mdelay(1); /* wait 1ms before checking room */
 352                         } while ((wr_room_space < cmd_size) &&
 353                                         time_before(jiffies, timeout));
 354
 355                         /* Timeout happened ? */
 356                         if (time_after_eq(jiffies, timeout)) {
 357                                 pr_err("Timeout while waiting for free "
 358                                                 "free space in uart tx buffer");
 359                                 release_firmware(kim_gdata->fw_entry);
 360                                 return -ETIMEDOUT;
 361                         }
 362                         /* reinit completion before sending for the
 363                          * relevant wait
 364                          */
 365                         reinit_completion(&kim_gdata->kim_rcvd);
 366
 367                         /*
 368                          * Free space found in uart buffer, call st_int_write
 369                          * to send current firmware command to the uart tx
 370                          * buffer.
 371                          */
 372                         err = st_int_write(kim_gdata->core_data,
 373                         ((struct bts_action_send *)action_ptr)->data,
 374                                            ((struct bts_action *)ptr)->size);
 375                         if (unlikely(err < 0)) {
 376                                 release_firmware(kim_gdata->fw_entry);
 377                                 return err;
 378                         }
 379                         /*
 380                          * Check number of bytes written to the uart tx buffer
 381                          * and requested command write size
 382                          */
 383                         if (err != cmd_size) {
 384                                 pr_err("Number of bytes written to uart "
 385                                                 "tx buffer are not matching with "
 386                                                 "requested cmd write size");
 387                                 release_firmware(kim_gdata->fw_entry);
 388                                 return -EIO;
 389                         }
 390                         break;
 391                 case ACTION_WAIT_EVENT:  /* wait */
 392                         pr_debug("W");
 393                         if (!wait_for_completion_interruptible_timeout(
 394                                         &kim_gdata->kim_rcvd,
 395                                         msecs_to_jiffies(CMD_RESP_TIME))) {
 396                                 pr_err("response timeout during fw download ");
 397                                 /* timed out */
 398                                 release_firmware(kim_gdata->fw_entry);
 399                                 return -ETIMEDOUT;
 400                         }
 401                         reinit_completion(&kim_gdata->kim_rcvd);
 402                         break;
 403                 case ACTION_DELAY:      /* sleep */
 404                         pr_info("sleep command in scr");
 405                         action_ptr = &(((struct bts_action *)ptr)->data[0]);
 406                         mdelay(((struct bts_action_delay *)action_ptr)->msec);
 407                         break;
 408                 }
 409                 len =
 410                     len - (sizeof(struct bts_action) +
 411                            ((struct bts_action *)ptr)->size);
 412                 ptr =
 413                     ptr + sizeof(struct bts_action) +
 414                     ((struct bts_action *)ptr)->size;
 415         }
 416         /* fw download complete */
 417         release_firmware(kim_gdata->fw_entry);
 418         return 0;
 419 }
 420
 421 /**********************************************************************/
 422 /* functions called from ST core */
 423 /* called from ST Core, when REG_IN_PROGRESS (registration in progress)
 424  * can be because of
 425  * 1. response to read local version
 426  * 2. during send/recv's of firmware download
 427  */
 428 void st_kim_recv(void *disc_data, const unsigned char *data, long count)
 429 {
 430         struct st_data_s        *st_gdata = (struct st_data_s *)disc_data;
 431         struct kim_data_s       *kim_gdata = st_gdata->kim_data;
 432
 433         /* proceed to gather all data and distinguish read fw version response
 434          * from other fw responses when data gathering is complete
 435          */
 436         kim_int_recv(kim_gdata, data, count);
 437         return;
 438 }
 439
 440 /* to signal completion of line discipline installation
 441  * called from ST Core, upon tty_open
 442  */
 443 void st_kim_complete(void *kim_data)
 444 {
 445         struct kim_data_s       *kim_gdata = (struct kim_data_s *)kim_data;
 446         complete(&kim_gdata->ldisc_installed);
 447 }
 448
 449 /**
 450  * st_kim_start - called from ST Core upon 1st registration
 451  *      This involves toggling the chip enable gpio, reading
 452  *      the firmware version from chip, forming the fw file name
 453  *      based on the chip version, requesting the fw, parsing it
 454  *      and perform download(send/recv).
 455  */
 456 long st_kim_start(void *kim_data)
 457 {
 458         long err = 0;
 459         long retry = POR_RETRY_COUNT;
 460         struct ti_st_plat_data  *pdata;
 461         struct kim_data_s       *kim_gdata = (struct kim_data_s *)kim_data;
 462
 463         pr_info(" %s", __func__);
 464         pdata = kim_gdata->kim_pdev->dev.platform_data;
 465
 466         do {
 467                 /* platform specific enabling code here */
 468                 if (pdata->chip_enable)
 469                         pdata->chip_enable(kim_gdata);
 470
 471                 /* Configure BT nShutdown to HIGH state */
 472                 gpio_set_value(kim_gdata->nshutdown, GPIO_LOW);
 473                 mdelay(5);      /* FIXME: a proper toggle */
 474                 gpio_set_value(kim_gdata->nshutdown, GPIO_HIGH);
 475                 mdelay(100);
 476                 /* re-initialize the completion */
 477                 reinit_completion(&kim_gdata->ldisc_installed);
 478                 /* send notification to UIM */
 479                 kim_gdata->ldisc_install = 1;
 480                 pr_info("ldisc_install = 1");
 481                 sysfs_notify(&kim_gdata->kim_pdev->dev.kobj,
 482                                 NULL, "install");
 483                 /* wait for ldisc to be installed */
 484                 err = wait_for_completion_interruptible_timeout(
 485                         &kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));
 486                 if (!err) {
 487                         /* ldisc installation timeout,
 488                          * flush uart, power cycle BT_EN */
 489                         pr_err("ldisc installation timeout");
 490                         err = st_kim_stop(kim_gdata);
 491                         continue;
 492                 } else {
 493                         /* ldisc installed now */
 494                         pr_info("line discipline installed");
 495                         err = download_firmware(kim_gdata);
 496                         if (err != 0) {
 497                                 /* ldisc installed but fw download failed,
 498                                  * flush uart & power cycle BT_EN */
 499                                 pr_err("download firmware failed");
 500                                 err = st_kim_stop(kim_gdata);
 501                                 continue;
 502                         } else {        /* on success don't retry */
 503                                 break;
 504                         }
 505                 }
 506         } while (retry--);
 507         return err;
 508 }
 509
 510 /**
 511  * st_kim_stop - stop communication with chip.
 512  *      This can be called from ST Core/KIM, on the-
 513  *      (a) last un-register when chip need not be powered there-after,
 514  *      (b) upon failure to either install ldisc or download firmware.
 515  *      The function is responsible to (a) notify UIM about un-installation,
 516  *      (b) flush UART if the ldisc was installed.
 517  *      (c) reset BT_EN - pull down nshutdown at the end.
 518  *      (d) invoke platform's chip disabling routine.
 519  */
 520 long st_kim_stop(void *kim_data)
 521 {
 522         long err = 0;
 523         struct kim_data_s       *kim_gdata = (struct kim_data_s *)kim_data;
 524         struct ti_st_plat_data  *pdata =
 525                 kim_gdata->kim_pdev->dev.platform_data;
 526         struct tty_struct       *tty = kim_gdata->core_data->tty;
 527
 528         reinit_completion(&kim_gdata->ldisc_installed);
 529
 530         if (tty) {      /* can be called before ldisc is installed */
 531                 /* Flush any pending characters in the driver and discipline. */
 532                 tty_ldisc_flush(tty);
 533                 tty_driver_flush_buffer(tty);
 534         }
 535
 536         /* send uninstall notification to UIM */
 537         pr_info("ldisc_install = 0");
 538         kim_gdata->ldisc_install = 0;
 539         sysfs_notify(&kim_gdata->kim_pdev->dev.kobj, NULL, "install");
 540
 541         /* wait for ldisc to be un-installed */
 542         err = wait_for_completion_interruptible_timeout(
 543                 &kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));
 544         if (!err) {             /* timeout */
 545                 pr_err(" timed out waiting for ldisc to be un-installed");
 546                 err = -ETIMEDOUT;
 547         }
 548
 549         /* By default configure BT nShutdown to LOW state */
 550         gpio_set_value(kim_gdata->nshutdown, GPIO_LOW);
 551         mdelay(1);
 552         gpio_set_value(kim_gdata->nshutdown, GPIO_HIGH);
 553         mdelay(1);
 554         gpio_set_value(kim_gdata->nshutdown, GPIO_LOW);
 555
 556         /* platform specific disable */
 557         if (pdata->chip_disable)
 558                 pdata->chip_disable(kim_gdata);
 559         return err;
 560 }
 561
 562 /**********************************************************************/
 563 /* functions called from subsystems */
 564 /* called when debugfs entry is read from */
 565
 566 static int show_version(struct seq_file *s, void *unused)
 567 {
 568         struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
 569         seq_printf(s, "%04X %d.%d.%d\n", kim_gdata->version.full,
 570                         kim_gdata->version.chip, kim_gdata->version.maj_ver,
 571                         kim_gdata->version.min_ver);
 572         return 0;
 573 }
 574
 575 static int show_list(struct seq_file *s, void *unused)
 576 {
 577         struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
 578         kim_st_list_protocols(kim_gdata->core_data, s);
 579         return 0;
 580 }
 581
 582 static ssize_t show_install(struct device *dev,
 583                 struct device_attribute *attr, char *buf)
 584 {
 585         struct kim_data_s *kim_data = dev_get_drvdata(dev);
 586         return sprintf(buf, "%d\n", kim_data->ldisc_install);
 587 }
 588
 589 #ifdef DEBUG
 590 static ssize_t store_dev_name(struct device *dev,
 591                 struct device_attribute *attr, const char *buf, size_t count)
 592 {
 593         struct kim_data_s *kim_data = dev_get_drvdata(dev);
 594         pr_debug("storing dev name >%s<", buf);
 595         strncpy(kim_data->dev_name, buf, count);
 596         pr_debug("stored dev name >%s<", kim_data->dev_name);
 597         return count;
 598 }
 599
 600 static ssize_t store_baud_rate(struct device *dev,
 601                 struct device_attribute *attr, const char *buf, size_t count)
 602 {
 603         struct kim_data_s *kim_data = dev_get_drvdata(dev);
 604         pr_debug("storing baud rate >%s<", buf);
 605         sscanf(buf, "%ld", &kim_data->baud_rate);
 606         pr_debug("stored baud rate >%ld<", kim_data->baud_rate);
 607         return count;
 608 }
 609 #endif  /* if DEBUG */
 610
 611 static ssize_t show_dev_name(struct device *dev,
 612                 struct device_attribute *attr, char *buf)
 613 {
 614         struct kim_data_s *kim_data = dev_get_drvdata(dev);
 615         return sprintf(buf, "%s\n", kim_data->dev_name);
 616 }
 617
 618 static ssize_t show_baud_rate(struct device *dev,
 619                 struct device_attribute *attr, char *buf)
 620 {
 621         struct kim_data_s *kim_data = dev_get_drvdata(dev);
 622         return sprintf(buf, "%ld\n", kim_data->baud_rate);
 623 }
 624
 625 static ssize_t show_flow_cntrl(struct device *dev,
 626                 struct device_attribute *attr, char *buf)
 627 {
 628         struct kim_data_s *kim_data = dev_get_drvdata(dev);
 629         return sprintf(buf, "%d\n", kim_data->flow_cntrl);
 630 }
 631
 632 /* structures specific for sysfs entries */
 633 static struct kobj_attribute ldisc_install =
 634 __ATTR(install, 0444, (void *)show_install, NULL);
 635
 636 static struct kobj_attribute uart_dev_name =
 637 #ifdef DEBUG    /* TODO: move this to debug-fs if possible */
 638 __ATTR(dev_name, 0644, (void *)show_dev_name, (void *)store_dev_name);
 639 #else
 640 __ATTR(dev_name, 0444, (void *)show_dev_name, NULL);
 641 #endif
 642
 643 static struct kobj_attribute uart_baud_rate =
 644 #ifdef DEBUG    /* TODO: move to debugfs */
 645 __ATTR(baud_rate, 0644, (void *)show_baud_rate, (void *)store_baud_rate);
 646 #else
 647 __ATTR(baud_rate, 0444, (void *)show_baud_rate, NULL);
 648 #endif
 649
 650 static struct kobj_attribute uart_flow_cntrl =
 651 __ATTR(flow_cntrl, 0444, (void *)show_flow_cntrl, NULL);
 652
 653 static struct attribute *uim_attrs[] = {
 654         &ldisc_install.attr,
 655         &uart_dev_name.attr,
 656         &uart_baud_rate.attr,
 657         &uart_flow_cntrl.attr,
 658         NULL,
 659 };
 660
 661 static struct attribute_group uim_attr_grp = {
 662         .attrs = uim_attrs,
 663 };
 664
 665 /**
 666  * st_kim_ref - reference the core's data
 667  *      This references the per-ST platform device in the arch/xx/
 668  *      board-xx.c file.
 669  *      This would enable multiple such platform devices to exist
 670  *      on a given platform
 671  */
 672 void st_kim_ref(struct st_data_s **core_data, int id)
 673 {
 674         struct platform_device  *pdev;
 675         struct kim_data_s       *kim_gdata;
 676         /* get kim_gdata reference from platform device */
 677         pdev = st_get_plat_device(id);
 678         if (!pdev) {
 679                 *core_data = NULL;
 680                 return;
 681         }
 682         kim_gdata = platform_get_drvdata(pdev);
 683         *core_data = kim_gdata->core_data;
 684 }
 685
 686 static int kim_version_open(struct inode *i, struct file *f)
 687 {
 688         return single_open(f, show_version, i->i_private);
 689 }
 690
 691 static int kim_list_open(struct inode *i, struct file *f)
 692 {
 693         return single_open(f, show_list, i->i_private);
 694 }
 695
 696 static const struct file_operations version_debugfs_fops = {
 697         /* version info */
 698         .open = kim_version_open,
 699         .read = seq_read,
 700         .llseek = seq_lseek,
 701         .release = single_release,
 702 };
 703 static const struct file_operations list_debugfs_fops = {
 704         /* protocols info */
 705         .open = kim_list_open,
 706         .read = seq_read,
 707         .llseek = seq_lseek,
 708         .release = single_release,
 709 };
 710
 711 /**********************************************************************/
 712 /* functions called from platform device driver subsystem
 713  * need to have a relevant platform device entry in the platform's
 714  * board-*.c file
 715  */
 716
 717 static struct dentry *kim_debugfs_dir;
 718 static int kim_probe(struct platform_device *pdev)
 719 {
 720         struct kim_data_s       *kim_gdata;
 721         struct ti_st_plat_data  *pdata = pdev->dev.platform_data;
 722         int err;
 723
 724         if ((pdev->id != -1) && (pdev->id < MAX_ST_DEVICES)) {
 725                 /* multiple devices could exist */
 726                 st_kim_devices[pdev->id] = pdev;
 727         } else {
 728                 /* platform's sure about existence of 1 device */
 729                 st_kim_devices[0] = pdev;
 730         }
 731
 732         kim_gdata = kzalloc(sizeof(struct kim_data_s), GFP_ATOMIC);
 733         if (!kim_gdata) {
 734                 pr_err("no mem to allocate");
 735                 return -ENOMEM;
 736         }
 737         platform_set_drvdata(pdev, kim_gdata);
 738
 739         err = st_core_init(&kim_gdata->core_data);
 740         if (err != 0) {
 741                 pr_err(" ST core init failed");
 742                 err = -EIO;
 743                 goto err_core_init;
 744         }
 745         /* refer to itself */
 746         kim_gdata->core_data->kim_data = kim_gdata;
 747
 748         /* Claim the chip enable nShutdown gpio from the system */
 749         kim_gdata->nshutdown = pdata->nshutdown_gpio;
 750         err = gpio_request(kim_gdata->nshutdown, "kim");
 751         if (unlikely(err)) {
 752                 pr_err(" gpio %ld request failed ", kim_gdata->nshutdown);
 753                 return err;
 754         }
 755
 756         /* Configure nShutdown GPIO as output=0 */
 757         err = gpio_direction_output(kim_gdata->nshutdown, 0);
 758         if (unlikely(err)) {
 759                 pr_err(" unable to configure gpio %ld", kim_gdata->nshutdown);
 760                 return err;
 761         }
 762         /* get reference of pdev for request_firmware
 763          */
 764         kim_gdata->kim_pdev = pdev;
 765         init_completion(&kim_gdata->kim_rcvd);
 766         init_completion(&kim_gdata->ldisc_installed);
 767
 768         err = sysfs_create_group(&pdev->dev.kobj, &uim_attr_grp);
 769         if (err) {
 770                 pr_err("failed to create sysfs entries");
 771                 goto err_sysfs_group;
 772         }
 773
 774         /* copying platform data */
 775         strncpy(kim_gdata->dev_name, pdata->dev_name, UART_DEV_NAME_LEN);
 776         kim_gdata->flow_cntrl = pdata->flow_cntrl;
 777         kim_gdata->baud_rate = pdata->baud_rate;
 778         pr_info("sysfs entries created\n");
 779
 780         kim_debugfs_dir = debugfs_create_dir("ti-st", NULL);
 781         if (IS_ERR(kim_debugfs_dir)) {
 782                 pr_err(" debugfs entries creation failed ");
 783                 err = -EIO;
 784                 goto err_debugfs_dir;
 785         }
 786
 787         debugfs_create_file("version", S_IRUGO, kim_debugfs_dir,
 788                                 kim_gdata, &version_debugfs_fops);
 789         debugfs_create_file("protocols", S_IRUGO, kim_debugfs_dir,
 790                                 kim_gdata, &list_debugfs_fops);
 791         pr_info(" debugfs entries created ");
 792         return 0;
 793
 794 err_debugfs_dir:
 795         sysfs_remove_group(&pdev->dev.kobj, &uim_attr_grp);
 796
 797 err_sysfs_group:
 798         st_core_exit(kim_gdata->core_data);
 799
 800 err_core_init:
 801         kfree(kim_gdata);
 802
 803         return err;
 804 }
 805
 806 static int kim_remove(struct platform_device *pdev)
 807 {
 808         /* free the GPIOs requested */
 809         struct ti_st_plat_data  *pdata = pdev->dev.platform_data;
 810         struct kim_data_s       *kim_gdata;
 811
 812         kim_gdata = platform_get_drvdata(pdev);
 813
 814         /* Free the Bluetooth/FM/GPIO
 815          * nShutdown gpio from the system
 816          */
 817         gpio_free(pdata->nshutdown_gpio);
 818         pr_info("nshutdown GPIO Freed");
 819
 820         debugfs_remove_recursive(kim_debugfs_dir);
 821         sysfs_remove_group(&pdev->dev.kobj, &uim_attr_grp);
 822         pr_info("sysfs entries removed");
 823
 824         kim_gdata->kim_pdev = NULL;
 825         st_core_exit(kim_gdata->core_data);
 826
 827         kfree(kim_gdata);
 828         kim_gdata = NULL;
 829         return 0;
 830 }
 831
 832 static int kim_suspend(struct platform_device *pdev, pm_message_t state)
 833 {
 834         struct ti_st_plat_data  *pdata = pdev->dev.platform_data;
 835
 836         if (pdata->suspend)
 837                 return pdata->suspend(pdev, state);
 838
 839         return -EOPNOTSUPP;
 840 }
 841
 842 static int kim_resume(struct platform_device *pdev)
 843 {
 844         struct ti_st_plat_data  *pdata = pdev->dev.platform_data;
 845
 846         if (pdata->resume)
 847                 return pdata->resume(pdev);
 848
 849         return -EOPNOTSUPP;
 850 }
 851
 852 /**********************************************************************/
 853 /* entry point for ST KIM module, called in from ST Core */
 854 static struct platform_driver kim_platform_driver = {
 855         .probe = kim_probe,
 856         .remove = kim_remove,
 857         .suspend = kim_suspend,
 858         .resume = kim_resume,
 859         .driver = {
 860                 .name = "kim",
 861                 .owner = THIS_MODULE,
 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");