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