linux/drivers/misc/ti-st/st_kim.c
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   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 */
  42static 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 */
  55static 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 */
  66static 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 */
 100static 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 */
 139static 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
 214static 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, "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
 260static 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 */
 285static 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                        if (!wait_for_completion_interruptible_timeout(
 395                                        &kim_gdata->kim_rcvd,
 396                                        msecs_to_jiffies(CMD_RESP_TIME))) {
 397                                pr_err("response timeout during fw download ");
 398                                /* timed out */
 399                                release_firmware(kim_gdata->fw_entry);
 400                                return -ETIMEDOUT;
 401                        }
 402                        reinit_completion(&kim_gdata->kim_rcvd);
 403                        break;
 404                case ACTION_DELAY:      /* sleep */
 405                        pr_info("sleep command in scr");
 406                        action_ptr = &(((struct bts_action *)ptr)->data[0]);
 407                        mdelay(((struct bts_action_delay *)action_ptr)->msec);
 408                        break;
 409                }
 410                len =
 411                    len - (sizeof(struct bts_action) +
 412                           ((struct bts_action *)ptr)->size);
 413                ptr =
 414                    ptr + sizeof(struct bts_action) +
 415                    ((struct bts_action *)ptr)->size;
 416        }
 417        /* fw download complete */
 418        release_firmware(kim_gdata->fw_entry);
 419        return 0;
 420}
 421
 422/**********************************************************************/
 423/* functions called from ST core */
 424/* called from ST Core, when REG_IN_PROGRESS (registration in progress)
 425 * can be because of
 426 * 1. response to read local version
 427 * 2. during send/recv's of firmware download
 428 */
 429void st_kim_recv(void *disc_data, const unsigned char *data, long count)
 430{
 431        struct st_data_s        *st_gdata = (struct st_data_s *)disc_data;
 432        struct kim_data_s       *kim_gdata = st_gdata->kim_data;
 433
 434        /* proceed to gather all data and distinguish read fw version response
 435         * from other fw responses when data gathering is complete
 436         */
 437        kim_int_recv(kim_gdata, data, count);
 438        return;
 439}
 440
 441/* to signal completion of line discipline installation
 442 * called from ST Core, upon tty_open
 443 */
 444void st_kim_complete(void *kim_data)
 445{
 446        struct kim_data_s       *kim_gdata = (struct kim_data_s *)kim_data;
 447        complete(&kim_gdata->ldisc_installed);
 448}
 449
 450/**
 451 * st_kim_start - called from ST Core upon 1st registration
 452 *      This involves toggling the chip enable gpio, reading
 453 *      the firmware version from chip, forming the fw file name
 454 *      based on the chip version, requesting the fw, parsing it
 455 *      and perform download(send/recv).
 456 */
 457long st_kim_start(void *kim_data)
 458{
 459        long err = 0;
 460        long retry = POR_RETRY_COUNT;
 461        struct ti_st_plat_data  *pdata;
 462        struct kim_data_s       *kim_gdata = (struct kim_data_s *)kim_data;
 463
 464        pr_info(" %s", __func__);
 465        pdata = kim_gdata->kim_pdev->dev.platform_data;
 466
 467        do {
 468                /* platform specific enabling code here */
 469                if (pdata->chip_enable)
 470                        pdata->chip_enable(kim_gdata);
 471
 472                /* Configure BT nShutdown to HIGH state */
 473                gpio_set_value(kim_gdata->nshutdown, GPIO_LOW);
 474                mdelay(5);      /* FIXME: a proper toggle */
 475                gpio_set_value(kim_gdata->nshutdown, GPIO_HIGH);
 476                mdelay(100);
 477                /* re-initialize the completion */
 478                reinit_completion(&kim_gdata->ldisc_installed);
 479                /* send notification to UIM */
 480                kim_gdata->ldisc_install = 1;
 481                pr_info("ldisc_install = 1");
 482                sysfs_notify(&kim_gdata->kim_pdev->dev.kobj,
 483                                NULL, "install");
 484                /* wait for ldisc to be installed */
 485                err = wait_for_completion_interruptible_timeout(
 486                        &kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));
 487                if (!err) {
 488                        /* ldisc installation timeout,
 489                         * flush uart, power cycle BT_EN */
 490                        pr_err("ldisc installation timeout");
 491                        err = st_kim_stop(kim_gdata);
 492                        continue;
 493                } else {
 494                        /* ldisc installed now */
 495                        pr_info("line discipline installed");
 496                        err = download_firmware(kim_gdata);
 497                        if (err != 0) {
 498                                /* ldisc installed but fw download failed,
 499                                 * flush uart & power cycle BT_EN */
 500                                pr_err("download firmware failed");
 501                                err = st_kim_stop(kim_gdata);
 502                                continue;
 503                        } else {        /* on success don't retry */
 504                                break;
 505                        }
 506                }
 507        } while (retry--);
 508        return err;
 509}
 510
 511/**
 512 * st_kim_stop - stop communication with chip.
 513 *      This can be called from ST Core/KIM, on the-
 514 *      (a) last un-register when chip need not be powered there-after,
 515 *      (b) upon failure to either install ldisc or download firmware.
 516 *      The function is responsible to (a) notify UIM about un-installation,
 517 *      (b) flush UART if the ldisc was installed.
 518 *      (c) reset BT_EN - pull down nshutdown at the end.
 519 *      (d) invoke platform's chip disabling routine.
 520 */
 521long st_kim_stop(void *kim_data)
 522{
 523        long err = 0;
 524        struct kim_data_s       *kim_gdata = (struct kim_data_s *)kim_data;
 525        struct ti_st_plat_data  *pdata =
 526                kim_gdata->kim_pdev->dev.platform_data;
 527        struct tty_struct       *tty = kim_gdata->core_data->tty;
 528
 529        reinit_completion(&kim_gdata->ldisc_installed);
 530
 531        if (tty) {      /* can be called before ldisc is installed */
 532                /* Flush any pending characters in the driver and discipline. */
 533                tty_ldisc_flush(tty);
 534                tty_driver_flush_buffer(tty);
 535        }
 536
 537        /* send uninstall notification to UIM */
 538        pr_info("ldisc_install = 0");
 539        kim_gdata->ldisc_install = 0;
 540        sysfs_notify(&kim_gdata->kim_pdev->dev.kobj, NULL, "install");
 541
 542        /* wait for ldisc to be un-installed */
 543        err = wait_for_completion_interruptible_timeout(
 544                &kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));
 545        if (!err) {             /* timeout */
 546                pr_err(" timed out waiting for ldisc to be un-installed");
 547                err = -ETIMEDOUT;
 548        }
 549
 550        /* By default configure BT nShutdown to LOW state */
 551        gpio_set_value(kim_gdata->nshutdown, GPIO_LOW);
 552        mdelay(1);
 553        gpio_set_value(kim_gdata->nshutdown, GPIO_HIGH);
 554        mdelay(1);
 555        gpio_set_value(kim_gdata->nshutdown, GPIO_LOW);
 556
 557        /* platform specific disable */
 558        if (pdata->chip_disable)
 559                pdata->chip_disable(kim_gdata);
 560        return err;
 561}
 562
 563/**********************************************************************/
 564/* functions called from subsystems */
 565/* called when debugfs entry is read from */
 566
 567static int show_version(struct seq_file *s, void *unused)
 568{
 569        struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
 570        seq_printf(s, "%04X %d.%d.%d\n", kim_gdata->version.full,
 571                        kim_gdata->version.chip, kim_gdata->version.maj_ver,
 572                        kim_gdata->version.min_ver);
 573        return 0;
 574}
 575
 576static int show_list(struct seq_file *s, void *unused)
 577{
 578        struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
 579        kim_st_list_protocols(kim_gdata->core_data, s);
 580        return 0;
 581}
 582
 583static ssize_t show_install(struct device *dev,
 584                struct device_attribute *attr, char *buf)
 585{
 586        struct kim_data_s *kim_data = dev_get_drvdata(dev);
 587        return sprintf(buf, "%d\n", kim_data->ldisc_install);
 588}
 589
 590#ifdef DEBUG
 591static ssize_t store_dev_name(struct device *dev,
 592                struct device_attribute *attr, const char *buf, size_t count)
 593{
 594        struct kim_data_s *kim_data = dev_get_drvdata(dev);
 595        pr_debug("storing dev name >%s<", buf);
 596        strncpy(kim_data->dev_name, buf, count);
 597        pr_debug("stored dev name >%s<", kim_data->dev_name);
 598        return count;
 599}
 600
 601static ssize_t store_baud_rate(struct device *dev,
 602                struct device_attribute *attr, const char *buf, size_t count)
 603{
 604        struct kim_data_s *kim_data = dev_get_drvdata(dev);
 605        pr_debug("storing baud rate >%s<", buf);
 606        sscanf(buf, "%ld", &kim_data->baud_rate);
 607        pr_debug("stored baud rate >%ld<", kim_data->baud_rate);
 608        return count;
 609}
 610#endif  /* if DEBUG */
 611
 612static ssize_t show_dev_name(struct device *dev,
 613                struct device_attribute *attr, char *buf)
 614{
 615        struct kim_data_s *kim_data = dev_get_drvdata(dev);
 616        return sprintf(buf, "%s\n", kim_data->dev_name);
 617}
 618
 619static ssize_t show_baud_rate(struct device *dev,
 620                struct device_attribute *attr, char *buf)
 621{
 622        struct kim_data_s *kim_data = dev_get_drvdata(dev);
 623        return sprintf(buf, "%ld\n", kim_data->baud_rate);
 624}
 625
 626static ssize_t show_flow_cntrl(struct device *dev,
 627                struct device_attribute *attr, char *buf)
 628{
 629        struct kim_data_s *kim_data = dev_get_drvdata(dev);
 630        return sprintf(buf, "%d\n", kim_data->flow_cntrl);
 631}
 632
 633/* structures specific for sysfs entries */
 634static struct kobj_attribute ldisc_install =
 635__ATTR(install, 0444, (void *)show_install, NULL);
 636
 637static struct kobj_attribute uart_dev_name =
 638#ifdef DEBUG    /* TODO: move this to debug-fs if possible */
 639__ATTR(dev_name, 0644, (void *)show_dev_name, (void *)store_dev_name);
 640#else
 641__ATTR(dev_name, 0444, (void *)show_dev_name, NULL);
 642#endif
 643
 644static struct kobj_attribute uart_baud_rate =
 645#ifdef DEBUG    /* TODO: move to debugfs */
 646__ATTR(baud_rate, 0644, (void *)show_baud_rate, (void *)store_baud_rate);
 647#else
 648__ATTR(baud_rate, 0444, (void *)show_baud_rate, NULL);
 649#endif
 650
 651static struct kobj_attribute uart_flow_cntrl =
 652__ATTR(flow_cntrl, 0444, (void *)show_flow_cntrl, NULL);
 653
 654static struct attribute *uim_attrs[] = {
 655        &ldisc_install.attr,
 656        &uart_dev_name.attr,
 657        &uart_baud_rate.attr,
 658        &uart_flow_cntrl.attr,
 659        NULL,
 660};
 661
 662static struct attribute_group uim_attr_grp = {
 663        .attrs = uim_attrs,
 664};
 665
 666/**
 667 * st_kim_ref - reference the core's data
 668 *      This references the per-ST platform device in the arch/xx/
 669 *      board-xx.c file.
 670 *      This would enable multiple such platform devices to exist
 671 *      on a given platform
 672 */
 673void st_kim_ref(struct st_data_s **core_data, int id)
 674{
 675        struct platform_device  *pdev;
 676        struct kim_data_s       *kim_gdata;
 677        /* get kim_gdata reference from platform device */
 678        pdev = st_get_plat_device(id);
 679        if (!pdev) {
 680                *core_data = NULL;
 681                return;
 682        }
 683        kim_gdata = platform_get_drvdata(pdev);
 684        *core_data = kim_gdata->core_data;
 685}
 686
 687static int kim_version_open(struct inode *i, struct file *f)
 688{
 689        return single_open(f, show_version, i->i_private);
 690}
 691
 692static int kim_list_open(struct inode *i, struct file *f)
 693{
 694        return single_open(f, show_list, i->i_private);
 695}
 696
 697static const struct file_operations version_debugfs_fops = {
 698        /* version info */
 699        .open = kim_version_open,
 700        .read = seq_read,
 701        .llseek = seq_lseek,
 702        .release = single_release,
 703};
 704static const struct file_operations list_debugfs_fops = {
 705        /* protocols info */
 706        .open = kim_list_open,
 707        .read = seq_read,
 708        .llseek = seq_lseek,
 709        .release = single_release,
 710};
 711
 712/**********************************************************************/
 713/* functions called from platform device driver subsystem
 714 * need to have a relevant platform device entry in the platform's
 715 * board-*.c file
 716 */
 717
 718static struct dentry *kim_debugfs_dir;
 719static int kim_probe(struct platform_device *pdev)
 720{
 721        struct kim_data_s       *kim_gdata;
 722        struct ti_st_plat_data  *pdata = pdev->dev.platform_data;
 723        int err;
 724
 725        if ((pdev->id != -1) && (pdev->id < MAX_ST_DEVICES)) {
 726                /* multiple devices could exist */
 727                st_kim_devices[pdev->id] = pdev;
 728        } else {
 729                /* platform's sure about existence of 1 device */
 730                st_kim_devices[0] = pdev;
 731        }
 732
 733        kim_gdata = kzalloc(sizeof(struct kim_data_s), GFP_ATOMIC);
 734        if (!kim_gdata) {
 735                pr_err("no mem to allocate");
 736                return -ENOMEM;
 737        }
 738        platform_set_drvdata(pdev, kim_gdata);
 739
 740        err = st_core_init(&kim_gdata->core_data);
 741        if (err != 0) {
 742                pr_err(" ST core init failed");
 743                err = -EIO;
 744                goto err_core_init;
 745        }
 746        /* refer to itself */
 747        kim_gdata->core_data->kim_data = kim_gdata;
 748
 749        /* Claim the chip enable nShutdown gpio from the system */
 750        kim_gdata->nshutdown = pdata->nshutdown_gpio;
 751        err = gpio_request(kim_gdata->nshutdown, "kim");
 752        if (unlikely(err)) {
 753                pr_err(" gpio %ld request failed ", kim_gdata->nshutdown);
 754                return err;
 755        }
 756
 757        /* Configure nShutdown GPIO as output=0 */
 758        err = gpio_direction_output(kim_gdata->nshutdown, 0);
 759        if (unlikely(err)) {
 760                pr_err(" unable to configure gpio %ld", kim_gdata->nshutdown);
 761                return err;
 762        }
 763        /* get reference of pdev for request_firmware
 764         */
 765        kim_gdata->kim_pdev = pdev;
 766        init_completion(&kim_gdata->kim_rcvd);
 767        init_completion(&kim_gdata->ldisc_installed);
 768
 769        err = sysfs_create_group(&pdev->dev.kobj, &uim_attr_grp);
 770        if (err) {
 771                pr_err("failed to create sysfs entries");
 772                goto err_sysfs_group;
 773        }
 774
 775        /* copying platform data */
 776        strncpy(kim_gdata->dev_name, pdata->dev_name, UART_DEV_NAME_LEN);
 777        kim_gdata->flow_cntrl = pdata->flow_cntrl;
 778        kim_gdata->baud_rate = pdata->baud_rate;
 779        pr_info("sysfs entries created\n");
 780
 781        kim_debugfs_dir = debugfs_create_dir("ti-st", NULL);
 782        if (!kim_debugfs_dir) {
 783                pr_err(" debugfs entries creation failed ");
 784                err = -EIO;
 785                goto err_debugfs_dir;
 786        }
 787
 788        debugfs_create_file("version", S_IRUGO, kim_debugfs_dir,
 789                                kim_gdata, &version_debugfs_fops);
 790        debugfs_create_file("protocols", S_IRUGO, kim_debugfs_dir,
 791                                kim_gdata, &list_debugfs_fops);
 792        return 0;
 793
 794err_debugfs_dir:
 795        sysfs_remove_group(&pdev->dev.kobj, &uim_attr_grp);
 796
 797err_sysfs_group:
 798        st_core_exit(kim_gdata->core_data);
 799
 800err_core_init:
 801        kfree(kim_gdata);
 802
 803        return err;
 804}
 805
 806static 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
 832static 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
 842static 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 */
 854static 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        },
 862};
 863
 864module_platform_driver(kim_platform_driver);
 865
 866MODULE_AUTHOR("Pavan Savoy <pavan_savoy@ti.com>");
 867MODULE_DESCRIPTION("Shared Transport Driver for TI BT/FM/GPS combo chips ");
 868MODULE_LICENSE("GPL");
 869
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