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#define MAX_ST_DEVICES  3       /* Imagine 1 on each UART for now */
  41static 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 */
  54static 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 */
  65static void validate_firmware_response(struct kim_data_s *kim_gdata)
  66{
  67        struct sk_buff *skb = kim_gdata->rx_skb;
  68        if (!skb)
  69                return;
  70
  71        /* these magic numbers are the position in the response buffer which
  72         * allows us to distinguish whether the response is for the read
  73         * version info. command
  74         */
  75        if (skb->data[2] == 0x01 && skb->data[3] == 0x01 &&
  76                        skb->data[4] == 0x10 && skb->data[5] == 0x00) {
  77                /* fw version response */
  78                memcpy(kim_gdata->resp_buffer,
  79                                kim_gdata->rx_skb->data,
  80                                kim_gdata->rx_skb->len);
  81                kim_gdata->rx_state = ST_W4_PACKET_TYPE;
  82                kim_gdata->rx_skb = NULL;
  83                kim_gdata->rx_count = 0;
  84        } else if (unlikely(skb->data[5] != 0)) {
  85                pr_err("no proper response during fw download");
  86                pr_err("data6 %x", skb->data[5]);
  87                kfree_skb(skb);
  88                return;         /* keep waiting for the proper response */
  89        }
  90        /* becos of all the script being downloaded */
  91        complete_all(&kim_gdata->kim_rcvd);
  92        kfree_skb(skb);
  93}
  94
  95/* check for data len received inside kim_int_recv
  96 * most often hit the last case to update state to waiting for data
  97 */
  98static inline int kim_check_data_len(struct kim_data_s *kim_gdata, int len)
  99{
 100        register int room = skb_tailroom(kim_gdata->rx_skb);
 101
 102        pr_debug("len %d room %d", len, room);
 103
 104        if (!len) {
 105                validate_firmware_response(kim_gdata);
 106        } else if (len > room) {
 107                /* Received packet's payload length is larger.
 108                 * We can't accommodate it in created skb.
 109                 */
 110                pr_err("Data length is too large len %d room %d", len,
 111                           room);
 112                kfree_skb(kim_gdata->rx_skb);
 113        } else {
 114                /* Packet header has non-zero payload length and
 115                 * we have enough space in created skb. Lets read
 116                 * payload data */
 117                kim_gdata->rx_state = ST_W4_DATA;
 118                kim_gdata->rx_count = len;
 119                return len;
 120        }
 121
 122        /* Change ST LL state to continue to process next
 123         * packet */
 124        kim_gdata->rx_state = ST_W4_PACKET_TYPE;
 125        kim_gdata->rx_skb = NULL;
 126        kim_gdata->rx_count = 0;
 127
 128        return 0;
 129}
 130
 131/**
 132 * kim_int_recv - receive function called during firmware download
 133 *      firmware download responses on different UART drivers
 134 *      have been observed to come in bursts of different
 135 *      tty_receive and hence the logic
 136 */
 137static void kim_int_recv(struct kim_data_s *kim_gdata,
 138        const unsigned char *data, long count)
 139{
 140        const unsigned char *ptr;
 141        int len = 0, type = 0;
 142        unsigned char *plen;
 143
 144        pr_debug("%s", __func__);
 145        /* Decode received bytes here */
 146        ptr = data;
 147        if (unlikely(ptr == NULL)) {
 148                pr_err(" received null from TTY ");
 149                return;
 150        }
 151
 152        while (count) {
 153                if (kim_gdata->rx_count) {
 154                        len = min_t(unsigned int, kim_gdata->rx_count, count);
 155                        memcpy(skb_put(kim_gdata->rx_skb, len), ptr, len);
 156                        kim_gdata->rx_count -= len;
 157                        count -= len;
 158                        ptr += len;
 159
 160                        if (kim_gdata->rx_count)
 161                                continue;
 162
 163                        /* Check ST RX state machine , where are we? */
 164                        switch (kim_gdata->rx_state) {
 165                                /* Waiting for complete packet ? */
 166                        case ST_W4_DATA:
 167                                pr_debug("Complete pkt received");
 168                                validate_firmware_response(kim_gdata);
 169                                kim_gdata->rx_state = ST_W4_PACKET_TYPE;
 170                                kim_gdata->rx_skb = NULL;
 171                                continue;
 172                                /* Waiting for Bluetooth event header ? */
 173                        case ST_W4_HEADER:
 174                                plen =
 175                                (unsigned char *)&kim_gdata->rx_skb->data[1];
 176                                pr_debug("event hdr: plen 0x%02x\n", *plen);
 177                                kim_check_data_len(kim_gdata, *plen);
 178                                continue;
 179                        }       /* end of switch */
 180                }               /* end of if rx_state */
 181                switch (*ptr) {
 182                        /* Bluetooth event packet? */
 183                case 0x04:
 184                        kim_gdata->rx_state = ST_W4_HEADER;
 185                        kim_gdata->rx_count = 2;
 186                        type = *ptr;
 187                        break;
 188                default:
 189                        pr_info("unknown packet");
 190                        ptr++;
 191                        count--;
 192                        continue;
 193                }
 194                ptr++;
 195                count--;
 196                kim_gdata->rx_skb =
 197                        alloc_skb(1024+8, GFP_ATOMIC);
 198                if (!kim_gdata->rx_skb) {
 199                        pr_err("can't allocate mem for new packet");
 200                        kim_gdata->rx_state = ST_W4_PACKET_TYPE;
 201                        kim_gdata->rx_count = 0;
 202                        return;
 203                }
 204                skb_reserve(kim_gdata->rx_skb, 8);
 205                kim_gdata->rx_skb->cb[0] = 4;
 206                kim_gdata->rx_skb->cb[1] = 0;
 207
 208        }
 209        return;
 210}
 211
 212static long read_local_version(struct kim_data_s *kim_gdata, char *bts_scr_name)
 213{
 214        unsigned short version = 0, chip = 0, min_ver = 0, maj_ver = 0;
 215        const char read_ver_cmd[] = { 0x01, 0x01, 0x10, 0x00 };
 216        long timeout;
 217
 218        pr_debug("%s", __func__);
 219
 220        reinit_completion(&kim_gdata->kim_rcvd);
 221        if (4 != st_int_write(kim_gdata->core_data, read_ver_cmd, 4)) {
 222                pr_err("kim: couldn't write 4 bytes");
 223                return -EIO;
 224        }
 225
 226        timeout = wait_for_completion_interruptible_timeout(
 227                &kim_gdata->kim_rcvd, msecs_to_jiffies(CMD_RESP_TIME));
 228        if (timeout <= 0) {
 229                pr_err(" waiting for ver info- timed out or received signal");
 230                return timeout ? -ERESTARTSYS : -ETIMEDOUT;
 231        }
 232        reinit_completion(&kim_gdata->kim_rcvd);
 233        /* the positions 12 & 13 in the response buffer provide with the
 234         * chip, major & minor numbers
 235         */
 236
 237        version =
 238                MAKEWORD(kim_gdata->resp_buffer[12],
 239                                kim_gdata->resp_buffer[13]);
 240        chip = (version & 0x7C00) >> 10;
 241        min_ver = (version & 0x007F);
 242        maj_ver = (version & 0x0380) >> 7;
 243
 244        if (version & 0x8000)
 245                maj_ver |= 0x0008;
 246
 247        sprintf(bts_scr_name, "ti-connectivity/TIInit_%d.%d.%d.bts",
 248                chip, maj_ver, min_ver);
 249
 250        /* to be accessed later via sysfs entry */
 251        kim_gdata->version.full = version;
 252        kim_gdata->version.chip = chip;
 253        kim_gdata->version.maj_ver = maj_ver;
 254        kim_gdata->version.min_ver = min_ver;
 255
 256        pr_info("%s", bts_scr_name);
 257        return 0;
 258}
 259
 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                        err = wait_for_completion_interruptible_timeout(
 395                                        &kim_gdata->kim_rcvd,
 396                                        msecs_to_jiffies(CMD_RESP_TIME));
 397                        if (err <= 0) {
 398                                pr_err("response timeout/signaled during fw download ");
 399                                /* timed out */
 400                                release_firmware(kim_gdata->fw_entry);
 401                                return err ? -ERESTARTSYS : -ETIMEDOUT;
 402                        }
 403                        reinit_completion(&kim_gdata->kim_rcvd);
 404                        break;
 405                case ACTION_DELAY:      /* sleep */
 406                        pr_info("sleep command in scr");
 407                        action_ptr = &(((struct bts_action *)ptr)->data[0]);
 408                        mdelay(((struct bts_action_delay *)action_ptr)->msec);
 409                        break;
 410                }
 411                len =
 412                    len - (sizeof(struct bts_action) +
 413                           ((struct bts_action *)ptr)->size);
 414                ptr =
 415                    ptr + sizeof(struct bts_action) +
 416                    ((struct bts_action *)ptr)->size;
 417        }
 418        /* fw download complete */
 419        release_firmware(kim_gdata->fw_entry);
 420        return 0;
 421}
 422
 423/**********************************************************************/
 424/* functions called from ST core */
 425/* called from ST Core, when REG_IN_PROGRESS (registration in progress)
 426 * can be because of
 427 * 1. response to read local version
 428 * 2. during send/recv's of firmware download
 429 */
 430void st_kim_recv(void *disc_data, const unsigned char *data, long count)
 431{
 432        struct st_data_s        *st_gdata = (struct st_data_s *)disc_data;
 433        struct kim_data_s       *kim_gdata = st_gdata->kim_data;
 434
 435        /* proceed to gather all data and distinguish read fw version response
 436         * from other fw responses when data gathering is complete
 437         */
 438        kim_int_recv(kim_gdata, data, count);
 439        return;
 440}
 441
 442/* to signal completion of line discipline installation
 443 * called from ST Core, upon tty_open
 444 */
 445void st_kim_complete(void *kim_data)
 446{
 447        struct kim_data_s       *kim_gdata = (struct kim_data_s *)kim_data;
 448        complete(&kim_gdata->ldisc_installed);
 449}
 450
 451/**
 452 * st_kim_start - called from ST Core upon 1st registration
 453 *      This involves toggling the chip enable gpio, reading
 454 *      the firmware version from chip, forming the fw file name
 455 *      based on the chip version, requesting the fw, parsing it
 456 *      and perform download(send/recv).
 457 */
 458long st_kim_start(void *kim_data)
 459{
 460        long err = 0;
 461        long retry = POR_RETRY_COUNT;
 462        struct ti_st_plat_data  *pdata;
 463        struct kim_data_s       *kim_gdata = (struct kim_data_s *)kim_data;
 464
 465        pr_info(" %s", __func__);
 466        pdata = kim_gdata->kim_pdev->dev.platform_data;
 467
 468        do {
 469                /* platform specific enabling code here */
 470                if (pdata->chip_enable)
 471                        pdata->chip_enable(kim_gdata);
 472
 473                /* Configure BT nShutdown to HIGH state */
 474                gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW);
 475                mdelay(5);      /* FIXME: a proper toggle */
 476                gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_HIGH);
 477                mdelay(100);
 478                /* re-initialize the completion */
 479                reinit_completion(&kim_gdata->ldisc_installed);
 480                /* send notification to UIM */
 481                kim_gdata->ldisc_install = 1;
 482                pr_info("ldisc_install = 1");
 483                sysfs_notify(&kim_gdata->kim_pdev->dev.kobj,
 484                                NULL, "install");
 485                /* wait for ldisc to be installed */
 486                err = wait_for_completion_interruptible_timeout(
 487                        &kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));
 488                if (!err) {
 489                        /* ldisc installation timeout,
 490                         * flush uart, power cycle BT_EN */
 491                        pr_err("ldisc installation timeout");
 492                        err = st_kim_stop(kim_gdata);
 493                        continue;
 494                } else {
 495                        /* ldisc installed now */
 496                        pr_info("line discipline installed");
 497                        err = download_firmware(kim_gdata);
 498                        if (err != 0) {
 499                                /* ldisc installed but fw download failed,
 500                                 * flush uart & power cycle BT_EN */
 501                                pr_err("download firmware failed");
 502                                err = st_kim_stop(kim_gdata);
 503                                continue;
 504                        } else {        /* on success don't retry */
 505                                break;
 506                        }
 507                }
 508        } while (retry--);
 509        return err;
 510}
 511
 512/**
 513 * st_kim_stop - stop communication with chip.
 514 *      This can be called from ST Core/KIM, on the-
 515 *      (a) last un-register when chip need not be powered there-after,
 516 *      (b) upon failure to either install ldisc or download firmware.
 517 *      The function is responsible to (a) notify UIM about un-installation,
 518 *      (b) flush UART if the ldisc was installed.
 519 *      (c) reset BT_EN - pull down nshutdown at the end.
 520 *      (d) invoke platform's chip disabling routine.
 521 */
 522long st_kim_stop(void *kim_data)
 523{
 524        long err = 0;
 525        struct kim_data_s       *kim_gdata = (struct kim_data_s *)kim_data;
 526        struct ti_st_plat_data  *pdata =
 527                kim_gdata->kim_pdev->dev.platform_data;
 528        struct tty_struct       *tty = kim_gdata->core_data->tty;
 529
 530        reinit_completion(&kim_gdata->ldisc_installed);
 531
 532        if (tty) {      /* can be called before ldisc is installed */
 533                /* Flush any pending characters in the driver and discipline. */
 534                tty_ldisc_flush(tty);
 535                tty_driver_flush_buffer(tty);
 536        }
 537
 538        /* send uninstall notification to UIM */
 539        pr_info("ldisc_install = 0");
 540        kim_gdata->ldisc_install = 0;
 541        sysfs_notify(&kim_gdata->kim_pdev->dev.kobj, NULL, "install");
 542
 543        /* wait for ldisc to be un-installed */
 544        err = wait_for_completion_interruptible_timeout(
 545                &kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));
 546        if (!err) {             /* timeout */
 547                pr_err(" timed out waiting for ldisc to be un-installed");
 548                err = -ETIMEDOUT;
 549        }
 550
 551        /* By default configure BT nShutdown to LOW state */
 552        gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW);
 553        mdelay(1);
 554        gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_HIGH);
 555        mdelay(1);
 556        gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW);
 557
 558        /* platform specific disable */
 559        if (pdata->chip_disable)
 560                pdata->chip_disable(kim_gdata);
 561        return err;
 562}
 563
 564/**********************************************************************/
 565/* functions called from subsystems */
 566/* called when debugfs entry is read from */
 567
 568static int show_version(struct seq_file *s, void *unused)
 569{
 570        struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
 571        seq_printf(s, "%04X %d.%d.%d\n", kim_gdata->version.full,
 572                        kim_gdata->version.chip, kim_gdata->version.maj_ver,
 573                        kim_gdata->version.min_ver);
 574        return 0;
 575}
 576
 577static int show_list(struct seq_file *s, void *unused)
 578{
 579        struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
 580        kim_st_list_protocols(kim_gdata->core_data, s);
 581        return 0;
 582}
 583
 584static ssize_t show_install(struct device *dev,
 585                struct device_attribute *attr, char *buf)
 586{
 587        struct kim_data_s *kim_data = dev_get_drvdata(dev);
 588        return sprintf(buf, "%d\n", kim_data->ldisc_install);
 589}
 590
 591#ifdef DEBUG
 592static ssize_t store_dev_name(struct device *dev,
 593                struct device_attribute *attr, const char *buf, size_t count)
 594{
 595        struct kim_data_s *kim_data = dev_get_drvdata(dev);
 596        pr_debug("storing dev name >%s<", buf);
 597        strncpy(kim_data->dev_name, buf, count);
 598        pr_debug("stored dev name >%s<", kim_data->dev_name);
 599        return count;
 600}
 601
 602static ssize_t store_baud_rate(struct device *dev,
 603                struct device_attribute *attr, const char *buf, size_t count)
 604{
 605        struct kim_data_s *kim_data = dev_get_drvdata(dev);
 606        pr_debug("storing baud rate >%s<", buf);
 607        sscanf(buf, "%ld", &kim_data->baud_rate);
 608        pr_debug("stored baud rate >%ld<", kim_data->baud_rate);
 609        return count;
 610}
 611#endif  /* if DEBUG */
 612
 613static ssize_t show_dev_name(struct device *dev,
 614                struct device_attribute *attr, char *buf)
 615{
 616        struct kim_data_s *kim_data = dev_get_drvdata(dev);
 617        return sprintf(buf, "%s\n", kim_data->dev_name);
 618}
 619
 620static ssize_t show_baud_rate(struct device *dev,
 621                struct device_attribute *attr, char *buf)
 622{
 623        struct kim_data_s *kim_data = dev_get_drvdata(dev);
 624        return sprintf(buf, "%d\n", kim_data->baud_rate);
 625}
 626
 627static ssize_t show_flow_cntrl(struct device *dev,
 628                struct device_attribute *attr, char *buf)
 629{
 630        struct kim_data_s *kim_data = dev_get_drvdata(dev);
 631        return sprintf(buf, "%d\n", kim_data->flow_cntrl);
 632}
 633
 634/* structures specific for sysfs entries */
 635static struct kobj_attribute ldisc_install =
 636__ATTR(install, 0444, (void *)show_install, NULL);
 637
 638static struct kobj_attribute uart_dev_name =
 639#ifdef DEBUG    /* TODO: move this to debug-fs if possible */
 640__ATTR(dev_name, 0644, (void *)show_dev_name, (void *)store_dev_name);
 641#else
 642__ATTR(dev_name, 0444, (void *)show_dev_name, NULL);
 643#endif
 644
 645static struct kobj_attribute uart_baud_rate =
 646#ifdef DEBUG    /* TODO: move to debugfs */
 647__ATTR(baud_rate, 0644, (void *)show_baud_rate, (void *)store_baud_rate);
 648#else
 649__ATTR(baud_rate, 0444, (void *)show_baud_rate, NULL);
 650#endif
 651
 652static struct kobj_attribute uart_flow_cntrl =
 653__ATTR(flow_cntrl, 0444, (void *)show_flow_cntrl, NULL);
 654
 655static struct attribute *uim_attrs[] = {
 656        &ldisc_install.attr,
 657        &uart_dev_name.attr,
 658        &uart_baud_rate.attr,
 659        &uart_flow_cntrl.attr,
 660        NULL,
 661};
 662
 663static struct attribute_group uim_attr_grp = {
 664        .attrs = uim_attrs,
 665};
 666
 667/**
 668 * st_kim_ref - reference the core's data
 669 *      This references the per-ST platform device in the arch/xx/
 670 *      board-xx.c file.
 671 *      This would enable multiple such platform devices to exist
 672 *      on a given platform
 673 */
 674void st_kim_ref(struct st_data_s **core_data, int id)
 675{
 676        struct platform_device  *pdev;
 677        struct kim_data_s       *kim_gdata;
 678        /* get kim_gdata reference from platform device */
 679        pdev = st_get_plat_device(id);
 680        if (!pdev)
 681                goto err;
 682        kim_gdata = platform_get_drvdata(pdev);
 683        if (!kim_gdata)
 684                goto err;
 685
 686        *core_data = kim_gdata->core_data;
 687        return;
 688err:
 689        *core_data = NULL;
 690}
 691
 692static int kim_version_open(struct inode *i, struct file *f)
 693{
 694        return single_open(f, show_version, i->i_private);
 695}
 696
 697static int kim_list_open(struct inode *i, struct file *f)
 698{
 699        return single_open(f, show_list, i->i_private);
 700}
 701
 702static const struct file_operations version_debugfs_fops = {
 703        /* version info */
 704        .open = kim_version_open,
 705        .read = seq_read,
 706        .llseek = seq_lseek,
 707        .release = single_release,
 708};
 709static const struct file_operations list_debugfs_fops = {
 710        /* protocols info */
 711        .open = kim_list_open,
 712        .read = seq_read,
 713        .llseek = seq_lseek,
 714        .release = single_release,
 715};
 716
 717/**********************************************************************/
 718/* functions called from platform device driver subsystem
 719 * need to have a relevant platform device entry in the platform's
 720 * board-*.c file
 721 */
 722
 723static struct dentry *kim_debugfs_dir;
 724static int kim_probe(struct platform_device *pdev)
 725{
 726        struct kim_data_s       *kim_gdata;
 727        struct ti_st_plat_data  *pdata = pdev->dev.platform_data;
 728        int err;
 729
 730        if ((pdev->id != -1) && (pdev->id < MAX_ST_DEVICES)) {
 731                /* multiple devices could exist */
 732                st_kim_devices[pdev->id] = pdev;
 733        } else {
 734                /* platform's sure about existence of 1 device */
 735                st_kim_devices[0] = pdev;
 736        }
 737
 738        kim_gdata = kzalloc(sizeof(struct kim_data_s), GFP_ATOMIC);
 739        if (!kim_gdata) {
 740                pr_err("no mem to allocate");
 741                return -ENOMEM;
 742        }
 743        platform_set_drvdata(pdev, kim_gdata);
 744
 745        err = st_core_init(&kim_gdata->core_data);
 746        if (err != 0) {
 747                pr_err(" ST core init failed");
 748                err = -EIO;
 749                goto err_core_init;
 750        }
 751        /* refer to itself */
 752        kim_gdata->core_data->kim_data = kim_gdata;
 753
 754        /* Claim the chip enable nShutdown gpio from the system */
 755        kim_gdata->nshutdown = pdata->nshutdown_gpio;
 756        err = gpio_request(kim_gdata->nshutdown, "kim");
 757        if (unlikely(err)) {
 758                pr_err(" gpio %d request failed ", kim_gdata->nshutdown);
 759                return err;
 760        }
 761
 762        /* Configure nShutdown GPIO as output=0 */
 763        err = gpio_direction_output(kim_gdata->nshutdown, 0);
 764        if (unlikely(err)) {
 765                pr_err(" unable to configure gpio %d", kim_gdata->nshutdown);
 766                return err;
 767        }
 768        /* get reference of pdev for request_firmware
 769         */
 770        kim_gdata->kim_pdev = pdev;
 771        init_completion(&kim_gdata->kim_rcvd);
 772        init_completion(&kim_gdata->ldisc_installed);
 773
 774        err = sysfs_create_group(&pdev->dev.kobj, &uim_attr_grp);
 775        if (err) {
 776                pr_err("failed to create sysfs entries");
 777                goto err_sysfs_group;
 778        }
 779
 780        /* copying platform data */
 781        strncpy(kim_gdata->dev_name, pdata->dev_name, UART_DEV_NAME_LEN);
 782        kim_gdata->flow_cntrl = pdata->flow_cntrl;
 783        kim_gdata->baud_rate = pdata->baud_rate;
 784        pr_info("sysfs entries created\n");
 785
 786        kim_debugfs_dir = debugfs_create_dir("ti-st", NULL);
 787        if (!kim_debugfs_dir) {
 788                pr_err(" debugfs entries creation failed ");
 789                return 0;
 790        }
 791
 792        debugfs_create_file("version", S_IRUGO, kim_debugfs_dir,
 793                                kim_gdata, &version_debugfs_fops);
 794        debugfs_create_file("protocols", S_IRUGO, kim_debugfs_dir,
 795                                kim_gdata, &list_debugfs_fops);
 796        return 0;
 797
 798err_sysfs_group:
 799        st_core_exit(kim_gdata->core_data);
 800
 801err_core_init:
 802        kfree(kim_gdata);
 803
 804        return err;
 805}
 806
 807static int kim_remove(struct platform_device *pdev)
 808{
 809        /* free the GPIOs requested */
 810        struct ti_st_plat_data  *pdata = pdev->dev.platform_data;
 811        struct kim_data_s       *kim_gdata;
 812
 813        kim_gdata = platform_get_drvdata(pdev);
 814
 815        /* Free the Bluetooth/FM/GPIO
 816         * nShutdown gpio from the system
 817         */
 818        gpio_free(pdata->nshutdown_gpio);
 819        pr_info("nshutdown GPIO Freed");
 820
 821        debugfs_remove_recursive(kim_debugfs_dir);
 822        sysfs_remove_group(&pdev->dev.kobj, &uim_attr_grp);
 823        pr_info("sysfs entries removed");
 824
 825        kim_gdata->kim_pdev = NULL;
 826        st_core_exit(kim_gdata->core_data);
 827
 828        kfree(kim_gdata);
 829        kim_gdata = NULL;
 830        return 0;
 831}
 832
 833static int kim_suspend(struct platform_device *pdev, pm_message_t state)
 834{
 835        struct ti_st_plat_data  *pdata = pdev->dev.platform_data;
 836
 837        if (pdata->suspend)
 838                return pdata->suspend(pdev, state);
 839
 840        return 0;
 841}
 842
 843static int kim_resume(struct platform_device *pdev)
 844{
 845        struct ti_st_plat_data  *pdata = pdev->dev.platform_data;
 846
 847        if (pdata->resume)
 848                return pdata->resume(pdev);
 849
 850        return 0;
 851}
 852
 853/**********************************************************************/
 854/* entry point for ST KIM module, called in from ST Core */
 855static struct platform_driver kim_platform_driver = {
 856        .probe = kim_probe,
 857        .remove = kim_remove,
 858        .suspend = kim_suspend,
 859        .resume = kim_resume,
 860        .driver = {
 861                .name = "kim",
 862        },
 863};
 864
 865module_platform_driver(kim_platform_driver);
 866
 867MODULE_AUTHOR("Pavan Savoy <pavan_savoy@ti.com>");
 868MODULE_DESCRIPTION("Shared Transport Driver for TI BT/FM/GPS combo chips ");
 869MODULE_LICENSE("GPL");
 870
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