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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Shared Transport Line discipline driver Core4 * Init Manager module responsible for GPIO control5 * and firmware download6 * Copyright (C) 2009-2010 Texas Instruments7 * Author: Pavan Savoy <pavan_savoy@ti.com>8 */9 10#define pr_fmt(fmt) "(stk) :" fmt11#include <linux/platform_device.h>12#include <linux/jiffies.h>13#include <linux/firmware.h>14#include <linux/delay.h>15#include <linux/wait.h>16#include <linux/gpio.h>17#include <linux/debugfs.h>18#include <linux/seq_file.h>19#include <linux/sched.h>20#include <linux/sysfs.h>21#include <linux/tty.h>22 23#include <linux/skbuff.h>24#include <linux/ti_wilink_st.h>25#include <linux/module.h>26 27#define MAX_ST_DEVICES 3 /* Imagine 1 on each UART for now */28static struct platform_device *st_kim_devices[MAX_ST_DEVICES];29 30/**********************************************************************/31/* internal functions */32 33/*34 * st_get_plat_device -35 * function which returns the reference to the platform device36 * requested by id. As of now only 1 such device exists (id=0)37 * the context requesting for reference can get the id to be38 * requested by a. The protocol driver which is registering or39 * b. the tty device which is opened.40 */41static struct platform_device *st_get_plat_device(int id)42{43 return st_kim_devices[id];44}45 46/*47 * validate_firmware_response -48 * function to return whether the firmware response was proper49 * in case of error don't complete so that waiting for proper50 * response times out51 */52static void validate_firmware_response(struct kim_data_s *kim_gdata)53{54 struct sk_buff *skb = kim_gdata->rx_skb;55 if (!skb)56 return;57 58 /*59 * these magic numbers are the position in the response buffer which60 * allows us to distinguish whether the response is for the read61 * version info. command62 */63 if (skb->data[2] == 0x01 && skb->data[3] == 0x01 &&64 skb->data[4] == 0x10 && skb->data[5] == 0x00) {65 /* fw version response */66 memcpy(kim_gdata->resp_buffer,67 kim_gdata->rx_skb->data,68 kim_gdata->rx_skb->len);69 kim_gdata->rx_state = ST_W4_PACKET_TYPE;70 kim_gdata->rx_skb = NULL;71 kim_gdata->rx_count = 0;72 } else if (unlikely(skb->data[5] != 0)) {73 pr_err("no proper response during fw download");74 pr_err("data6 %x", skb->data[5]);75 kfree_skb(skb);76 return; /* keep waiting for the proper response */77 }78 /* becos of all the script being downloaded */79 complete_all(&kim_gdata->kim_rcvd);80 kfree_skb(skb);81}82 83/*84 * check for data len received inside kim_int_recv85 * most often hit the last case to update state to waiting for data86 */87static inline int kim_check_data_len(struct kim_data_s *kim_gdata, int len)88{89 register int room = skb_tailroom(kim_gdata->rx_skb);90 91 pr_debug("len %d room %d", len, room);92 93 if (!len) {94 validate_firmware_response(kim_gdata);95 } else if (len > room) {96 /*97 * Received packet's payload length is larger.98 * We can't accommodate it in created skb.99 */100 pr_err("Data length is too large len %d room %d", len,101 room);102 kfree_skb(kim_gdata->rx_skb);103 } else {104 /*105 * Packet header has non-zero payload length and106 * we have enough space in created skb. Lets read107 * payload data */108 kim_gdata->rx_state = ST_W4_DATA;109 kim_gdata->rx_count = len;110 return len;111 }112 113 /*114 * Change ST LL state to continue to process next115 * packet116 */117 kim_gdata->rx_state = ST_W4_PACKET_TYPE;118 kim_gdata->rx_skb = NULL;119 kim_gdata->rx_count = 0;120 121 return 0;122}123 124/*125 * kim_int_recv - receive function called during firmware download126 * firmware download responses on different UART drivers127 * have been observed to come in bursts of different128 * tty_receive and hence the logic129 */130static void kim_int_recv(struct kim_data_s *kim_gdata, const u8 *ptr,131 size_t count)132{133 int len = 0;134 unsigned char *plen;135 136 pr_debug("%s", __func__);137 /* Decode received bytes here */138 while (count) {139 if (kim_gdata->rx_count) {140 len = min_t(unsigned int, kim_gdata->rx_count, count);141 skb_put_data(kim_gdata->rx_skb, ptr, len);142 kim_gdata->rx_count -= len;143 count -= len;144 ptr += len;145 146 if (kim_gdata->rx_count)147 continue;148 149 /* Check ST RX state machine , where are we? */150 switch (kim_gdata->rx_state) {151 /* Waiting for complete packet ? */152 case ST_W4_DATA:153 pr_debug("Complete pkt received");154 validate_firmware_response(kim_gdata);155 kim_gdata->rx_state = ST_W4_PACKET_TYPE;156 kim_gdata->rx_skb = NULL;157 continue;158 /* Waiting for Bluetooth event header ? */159 case ST_W4_HEADER:160 plen =161 (unsigned char *)&kim_gdata->rx_skb->data[1];162 pr_debug("event hdr: plen 0x%02x\n", *plen);163 kim_check_data_len(kim_gdata, *plen);164 continue;165 } /* end of switch */166 } /* end of if rx_state */167 switch (*ptr) {168 /* Bluetooth event packet? */169 case 0x04:170 kim_gdata->rx_state = ST_W4_HEADER;171 kim_gdata->rx_count = 2;172 break;173 default:174 pr_info("unknown packet");175 ptr++;176 count--;177 continue;178 }179 ptr++;180 count--;181 kim_gdata->rx_skb =182 alloc_skb(1024+8, GFP_ATOMIC);183 if (!kim_gdata->rx_skb) {184 pr_err("can't allocate mem for new packet");185 kim_gdata->rx_state = ST_W4_PACKET_TYPE;186 kim_gdata->rx_count = 0;187 return;188 }189 skb_reserve(kim_gdata->rx_skb, 8);190 kim_gdata->rx_skb->cb[0] = 4;191 kim_gdata->rx_skb->cb[1] = 0;192 193 }194 return;195}196 197static long read_local_version(struct kim_data_s *kim_gdata, char *bts_scr_name)198{199 unsigned short version = 0, chip = 0, min_ver = 0, maj_ver = 0;200 static const char read_ver_cmd[] = { 0x01, 0x01, 0x10, 0x00 };201 long time_left;202 203 pr_debug("%s", __func__);204 205 reinit_completion(&kim_gdata->kim_rcvd);206 if (4 != st_int_write(kim_gdata->core_data, read_ver_cmd, 4)) {207 pr_err("kim: couldn't write 4 bytes");208 return -EIO;209 }210 211 time_left = wait_for_completion_interruptible_timeout(212 &kim_gdata->kim_rcvd, msecs_to_jiffies(CMD_RESP_TIME));213 if (time_left <= 0) {214 pr_err(" waiting for ver info- timed out or received signal");215 return time_left ? -ERESTARTSYS : -ETIMEDOUT;216 }217 reinit_completion(&kim_gdata->kim_rcvd);218 /*219 * the positions 12 & 13 in the response buffer provide with the220 * chip, major & minor numbers221 */222 223 version =224 MAKEWORD(kim_gdata->resp_buffer[12],225 kim_gdata->resp_buffer[13]);226 chip = (version & 0x7C00) >> 10;227 min_ver = (version & 0x007F);228 maj_ver = (version & 0x0380) >> 7;229 230 if (version & 0x8000)231 maj_ver |= 0x0008;232 233 sprintf(bts_scr_name, "ti-connectivity/TIInit_%d.%d.%d.bts",234 chip, maj_ver, min_ver);235 236 /* to be accessed later via sysfs entry */237 kim_gdata->version.full = version;238 kim_gdata->version.chip = chip;239 kim_gdata->version.maj_ver = maj_ver;240 kim_gdata->version.min_ver = min_ver;241 242 pr_info("%s", bts_scr_name);243 return 0;244}245 246static void skip_change_remote_baud(unsigned char **ptr, long *len)247{248 unsigned char *nxt_action, *cur_action;249 cur_action = *ptr;250 251 nxt_action = cur_action + sizeof(struct bts_action) +252 ((struct bts_action *) cur_action)->size;253 254 if (((struct bts_action *) nxt_action)->type != ACTION_WAIT_EVENT) {255 pr_err("invalid action after change remote baud command");256 } else {257 *ptr = *ptr + sizeof(struct bts_action) +258 ((struct bts_action *)cur_action)->size;259 *len = *len - (sizeof(struct bts_action) +260 ((struct bts_action *)cur_action)->size);261 /* warn user on not commenting these in firmware */262 pr_warn("skipping the wait event of change remote baud");263 }264}265 266/*267 * download_firmware -268 * internal function which parses through the .bts firmware269 * script file intreprets SEND, DELAY actions only as of now270 */271static long download_firmware(struct kim_data_s *kim_gdata)272{273 long err = 0;274 long len = 0;275 unsigned char *ptr = NULL;276 unsigned char *action_ptr = NULL;277 unsigned char bts_scr_name[40] = { 0 }; /* 40 char long bts scr name? */278 int wr_room_space;279 int cmd_size;280 unsigned long timeout;281 282 err = read_local_version(kim_gdata, bts_scr_name);283 if (err != 0) {284 pr_err("kim: failed to read local ver");285 return err;286 }287 err =288 request_firmware(&kim_gdata->fw_entry, bts_scr_name,289 &kim_gdata->kim_pdev->dev);290 if (unlikely((err != 0) || (kim_gdata->fw_entry->data == NULL) ||291 (kim_gdata->fw_entry->size == 0))) {292 pr_err(" request_firmware failed(errno %ld) for %s", err,293 bts_scr_name);294 return -EINVAL;295 }296 ptr = (void *)kim_gdata->fw_entry->data;297 len = kim_gdata->fw_entry->size;298 /*299 * bts_header to remove out magic number and300 * version301 */302 ptr += sizeof(struct bts_header);303 len -= sizeof(struct bts_header);304 305 while (len > 0 && ptr) {306 pr_debug(" action size %d, type %d ",307 ((struct bts_action *)ptr)->size,308 ((struct bts_action *)ptr)->type);309 310 switch (((struct bts_action *)ptr)->type) {311 case ACTION_SEND_COMMAND: /* action send */312 pr_debug("S");313 action_ptr = &(((struct bts_action *)ptr)->data[0]);314 if (unlikely315 (((struct hci_command *)action_ptr)->opcode ==316 0xFF36)) {317 /*318 * ignore remote change319 * baud rate HCI VS command320 */321 pr_warn("change remote baud"322 " rate command in firmware");323 skip_change_remote_baud(&ptr, &len);324 break;325 }326 /*327 * Make sure we have enough free space in uart328 * tx buffer to write current firmware command329 */330 cmd_size = ((struct bts_action *)ptr)->size;331 timeout = jiffies + msecs_to_jiffies(CMD_WR_TIME);332 do {333 wr_room_space =334 st_get_uart_wr_room(kim_gdata->core_data);335 if (wr_room_space < 0) {336 pr_err("Unable to get free "337 "space info from uart tx buffer");338 release_firmware(kim_gdata->fw_entry);339 return wr_room_space;340 }341 mdelay(1); /* wait 1ms before checking room */342 } while ((wr_room_space < cmd_size) &&343 time_before(jiffies, timeout));344 345 /* Timeout happened ? */346 if (time_after_eq(jiffies, timeout)) {347 pr_err("Timeout while waiting for free "348 "free space in uart tx buffer");349 release_firmware(kim_gdata->fw_entry);350 return -ETIMEDOUT;351 }352 /*353 * reinit completion before sending for the354 * relevant wait355 */356 reinit_completion(&kim_gdata->kim_rcvd);357 358 /*359 * Free space found in uart buffer, call st_int_write360 * to send current firmware command to the uart tx361 * buffer.362 */363 err = st_int_write(kim_gdata->core_data,364 ((struct bts_action_send *)action_ptr)->data,365 ((struct bts_action *)ptr)->size);366 if (unlikely(err < 0)) {367 release_firmware(kim_gdata->fw_entry);368 return err;369 }370 /*371 * Check number of bytes written to the uart tx buffer372 * and requested command write size373 */374 if (err != cmd_size) {375 pr_err("Number of bytes written to uart "376 "tx buffer are not matching with "377 "requested cmd write size");378 release_firmware(kim_gdata->fw_entry);379 return -EIO;380 }381 break;382 case ACTION_WAIT_EVENT: /* wait */383 pr_debug("W");384 err = wait_for_completion_interruptible_timeout(385 &kim_gdata->kim_rcvd,386 msecs_to_jiffies(CMD_RESP_TIME));387 if (err <= 0) {388 pr_err("response timeout/signaled during fw download ");389 /* timed out */390 release_firmware(kim_gdata->fw_entry);391 return err ? -ERESTARTSYS : -ETIMEDOUT;392 }393 reinit_completion(&kim_gdata->kim_rcvd);394 break;395 case ACTION_DELAY: /* sleep */396 pr_info("sleep command in scr");397 action_ptr = &(((struct bts_action *)ptr)->data[0]);398 mdelay(((struct bts_action_delay *)action_ptr)->msec);399 break;400 }401 len =402 len - (sizeof(struct bts_action) +403 ((struct bts_action *)ptr)->size);404 ptr =405 ptr + sizeof(struct bts_action) +406 ((struct bts_action *)ptr)->size;407 }408 /* fw download complete */409 release_firmware(kim_gdata->fw_entry);410 return 0;411}412 413/**********************************************************************/414/* functions called from ST core */415/* called from ST Core, when REG_IN_PROGRESS (registration in progress)416 * can be because of417 * 1. response to read local version418 * 2. during send/recv's of firmware download419 */420void st_kim_recv(void *disc_data, const u8 *data, size_t count)421{422 struct st_data_s *st_gdata = (struct st_data_s *)disc_data;423 struct kim_data_s *kim_gdata = st_gdata->kim_data;424 425 /*426 * proceed to gather all data and distinguish read fw version response427 * from other fw responses when data gathering is complete428 */429 kim_int_recv(kim_gdata, data, count);430 return;431}432 433/*434 * to signal completion of line discipline installation435 * called from ST Core, upon tty_open436 */437void st_kim_complete(void *kim_data)438{439 struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;440 complete(&kim_gdata->ldisc_installed);441}442 443/*444 * st_kim_start - called from ST Core upon 1st registration445 * This involves toggling the chip enable gpio, reading446 * the firmware version from chip, forming the fw file name447 * based on the chip version, requesting the fw, parsing it448 * and perform download(send/recv).449 */450long st_kim_start(void *kim_data)451{452 long err = 0;453 long retry = POR_RETRY_COUNT;454 struct ti_st_plat_data *pdata;455 struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;456 457 pr_info(" %s", __func__);458 pdata = kim_gdata->kim_pdev->dev.platform_data;459 460 do {461 /* platform specific enabling code here */462 if (pdata->chip_enable)463 pdata->chip_enable(kim_gdata);464 465 /* Configure BT nShutdown to HIGH state */466 gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW);467 mdelay(5); /* FIXME: a proper toggle */468 gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_HIGH);469 mdelay(100);470 /* re-initialize the completion */471 reinit_completion(&kim_gdata->ldisc_installed);472 /* send notification to UIM */473 kim_gdata->ldisc_install = 1;474 pr_info("ldisc_install = 1");475 sysfs_notify(&kim_gdata->kim_pdev->dev.kobj,476 NULL, "install");477 /* wait for ldisc to be installed */478 err = wait_for_completion_interruptible_timeout(479 &kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));480 if (!err) {481 /*482 * ldisc installation timeout,483 * flush uart, power cycle BT_EN484 */485 pr_err("ldisc installation timeout");486 err = st_kim_stop(kim_gdata);487 continue;488 } else {489 /* ldisc installed now */490 pr_info("line discipline installed");491 err = download_firmware(kim_gdata);492 if (err != 0) {493 /*494 * ldisc installed but fw download failed,495 * flush uart & power cycle BT_EN496 */497 pr_err("download firmware failed");498 err = st_kim_stop(kim_gdata);499 continue;500 } else { /* on success don't retry */501 break;502 }503 }504 } while (retry--);505 return err;506}507 508/*509 * st_kim_stop - stop communication with chip.510 * This can be called from ST Core/KIM, on the-511 * (a) last un-register when chip need not be powered there-after,512 * (b) upon failure to either install ldisc or download firmware.513 * The function is responsible to (a) notify UIM about un-installation,514 * (b) flush UART if the ldisc was installed.515 * (c) reset BT_EN - pull down nshutdown at the end.516 * (d) invoke platform's chip disabling routine.517 */518long st_kim_stop(void *kim_data)519{520 long err = 0;521 struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;522 struct ti_st_plat_data *pdata =523 kim_gdata->kim_pdev->dev.platform_data;524 struct tty_struct *tty = kim_gdata->core_data->tty;525 526 reinit_completion(&kim_gdata->ldisc_installed);527 528 if (tty) { /* can be called before ldisc is installed */529 /* Flush any pending characters in the driver and discipline. */530 tty_ldisc_flush(tty);531 tty_driver_flush_buffer(tty);532 }533 534 /* send uninstall notification to UIM */535 pr_info("ldisc_install = 0");536 kim_gdata->ldisc_install = 0;537 sysfs_notify(&kim_gdata->kim_pdev->dev.kobj, NULL, "install");538 539 /* wait for ldisc to be un-installed */540 err = wait_for_completion_interruptible_timeout(541 &kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));542 if (!err) { /* timeout */543 pr_err(" timed out waiting for ldisc to be un-installed");544 err = -ETIMEDOUT;545 }546 547 /* By default configure BT nShutdown to LOW state */548 gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW);549 mdelay(1);550 gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_HIGH);551 mdelay(1);552 gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_LOW);553 554 /* platform specific disable */555 if (pdata->chip_disable)556 pdata->chip_disable(kim_gdata);557 return err;558}559 560/**********************************************************************/561/* functions called from subsystems */562/* called when debugfs entry is read from */563 564static int version_show(struct seq_file *s, void *unused)565{566 struct kim_data_s *kim_gdata = s->private;567 seq_printf(s, "%04X %d.%d.%d\n", kim_gdata->version.full,568 kim_gdata->version.chip, kim_gdata->version.maj_ver,569 kim_gdata->version.min_ver);570 return 0;571}572 573static int list_show(struct seq_file *s, void *unused)574{575 struct kim_data_s *kim_gdata = s->private;576 kim_st_list_protocols(kim_gdata->core_data, s);577 return 0;578}579 580static ssize_t show_install(struct device *dev,581 struct device_attribute *attr, char *buf)582{583 struct kim_data_s *kim_data = dev_get_drvdata(dev);584 return sprintf(buf, "%d\n", kim_data->ldisc_install);585}586 587#ifdef DEBUG588static ssize_t store_dev_name(struct device *dev,589 struct device_attribute *attr, const char *buf, size_t count)590{591 struct kim_data_s *kim_data = dev_get_drvdata(dev);592 pr_debug("storing dev name >%s<", buf);593 strscpy(kim_data->dev_name, buf, sizeof(kim_data->dev_name));594 pr_debug("stored dev name >%s<", kim_data->dev_name);595 return count;596}597 598static ssize_t store_baud_rate(struct device *dev,599 struct device_attribute *attr, const char *buf, size_t count)600{601 struct kim_data_s *kim_data = dev_get_drvdata(dev);602 pr_debug("storing baud rate >%s<", buf);603 sscanf(buf, "%ld", &kim_data->baud_rate);604 pr_debug("stored baud rate >%ld<", kim_data->baud_rate);605 return count;606}607#endif /* if DEBUG */608 609static ssize_t show_dev_name(struct device *dev,610 struct device_attribute *attr, char *buf)611{612 struct kim_data_s *kim_data = dev_get_drvdata(dev);613 return sprintf(buf, "%s\n", kim_data->dev_name);614}615 616static ssize_t show_baud_rate(struct device *dev,617 struct device_attribute *attr, char *buf)618{619 struct kim_data_s *kim_data = dev_get_drvdata(dev);620 return sprintf(buf, "%d\n", kim_data->baud_rate);621}622 623static ssize_t show_flow_cntrl(struct device *dev,624 struct device_attribute *attr, char *buf)625{626 struct kim_data_s *kim_data = dev_get_drvdata(dev);627 return sprintf(buf, "%d\n", kim_data->flow_cntrl);628}629 630/* structures specific for sysfs entries */631static struct kobj_attribute ldisc_install =632__ATTR(install, 0444, (void *)show_install, NULL);633 634static struct kobj_attribute uart_dev_name =635#ifdef DEBUG /* TODO: move this to debug-fs if possible */636__ATTR(dev_name, 0644, (void *)show_dev_name, (void *)store_dev_name);637#else638__ATTR(dev_name, 0444, (void *)show_dev_name, NULL);639#endif640 641static struct kobj_attribute uart_baud_rate =642#ifdef DEBUG /* TODO: move to debugfs */643__ATTR(baud_rate, 0644, (void *)show_baud_rate, (void *)store_baud_rate);644#else645__ATTR(baud_rate, 0444, (void *)show_baud_rate, NULL);646#endif647 648static struct kobj_attribute uart_flow_cntrl =649__ATTR(flow_cntrl, 0444, (void *)show_flow_cntrl, NULL);650 651static struct attribute *uim_attrs[] = {652 &ldisc_install.attr,653 &uart_dev_name.attr,654 &uart_baud_rate.attr,655 &uart_flow_cntrl.attr,656 NULL,657};658 659static const struct attribute_group uim_attr_grp = {660 .attrs = uim_attrs,661};662 663/*664 * st_kim_ref - reference the core's data665 * This references the per-ST platform device in the arch/xx/666 * board-xx.c file.667 * This would enable multiple such platform devices to exist668 * on a given platform669 */670void st_kim_ref(struct st_data_s **core_data, int id)671{672 struct platform_device *pdev;673 struct kim_data_s *kim_gdata;674 /* get kim_gdata reference from platform device */675 pdev = st_get_plat_device(id);676 if (!pdev)677 goto err;678 kim_gdata = platform_get_drvdata(pdev);679 if (!kim_gdata)680 goto err;681 682 *core_data = kim_gdata->core_data;683 return;684err:685 *core_data = NULL;686}687 688DEFINE_SHOW_ATTRIBUTE(version);689DEFINE_SHOW_ATTRIBUTE(list);690 691/**********************************************************************/692/* functions called from platform device driver subsystem693 * need to have a relevant platform device entry in the platform's694 * board-*.c file695 */696 697static struct dentry *kim_debugfs_dir;698static int kim_probe(struct platform_device *pdev)699{700 struct kim_data_s *kim_gdata;701 struct ti_st_plat_data *pdata = pdev->dev.platform_data;702 int err;703 704 if ((pdev->id != -1) && (pdev->id < MAX_ST_DEVICES)) {705 /* multiple devices could exist */706 st_kim_devices[pdev->id] = pdev;707 } else {708 /* platform's sure about existence of 1 device */709 st_kim_devices[0] = pdev;710 }711 712 kim_gdata = kzalloc(sizeof(struct kim_data_s), GFP_KERNEL);713 if (!kim_gdata) {714 pr_err("no mem to allocate");715 return -ENOMEM;716 }717 platform_set_drvdata(pdev, kim_gdata);718 719 err = st_core_init(&kim_gdata->core_data);720 if (err != 0) {721 pr_err(" ST core init failed");722 err = -EIO;723 goto err_core_init;724 }725 /* refer to itself */726 kim_gdata->core_data->kim_data = kim_gdata;727 728 /* Claim the chip enable nShutdown gpio from the system */729 kim_gdata->nshutdown = pdata->nshutdown_gpio;730 err = gpio_request(kim_gdata->nshutdown, "kim");731 if (unlikely(err)) {732 pr_err(" gpio %d request failed ", kim_gdata->nshutdown);733 goto err_sysfs_group;734 }735 736 /* Configure nShutdown GPIO as output=0 */737 err = gpio_direction_output(kim_gdata->nshutdown, 0);738 if (unlikely(err)) {739 pr_err(" unable to configure gpio %d", kim_gdata->nshutdown);740 goto err_sysfs_group;741 }742 /* get reference of pdev for request_firmware */743 kim_gdata->kim_pdev = pdev;744 init_completion(&kim_gdata->kim_rcvd);745 init_completion(&kim_gdata->ldisc_installed);746 747 err = sysfs_create_group(&pdev->dev.kobj, &uim_attr_grp);748 if (err) {749 pr_err("failed to create sysfs entries");750 goto err_sysfs_group;751 }752 753 /* copying platform data */754 strscpy(kim_gdata->dev_name, pdata->dev_name,755 sizeof(kim_gdata->dev_name));756 kim_gdata->flow_cntrl = pdata->flow_cntrl;757 kim_gdata->baud_rate = pdata->baud_rate;758 pr_info("sysfs entries created\n");759 760 kim_debugfs_dir = debugfs_create_dir("ti-st", NULL);761 762 debugfs_create_file("version", S_IRUGO, kim_debugfs_dir,763 kim_gdata, &version_fops);764 debugfs_create_file("protocols", S_IRUGO, kim_debugfs_dir,765 kim_gdata, &list_fops);766 return 0;767 768err_sysfs_group:769 st_core_exit(kim_gdata->core_data);770 771err_core_init:772 kfree(kim_gdata);773 774 return err;775}776 777static void kim_remove(struct platform_device *pdev)778{779 /* free the GPIOs requested */780 struct ti_st_plat_data *pdata = pdev->dev.platform_data;781 struct kim_data_s *kim_gdata;782 783 kim_gdata = platform_get_drvdata(pdev);784 785 /*786 * Free the Bluetooth/FM/GPIO787 * nShutdown gpio from the system788 */789 gpio_free(pdata->nshutdown_gpio);790 pr_info("nshutdown GPIO Freed");791 792 debugfs_remove_recursive(kim_debugfs_dir);793 sysfs_remove_group(&pdev->dev.kobj, &uim_attr_grp);794 pr_info("sysfs entries removed");795 796 kim_gdata->kim_pdev = NULL;797 st_core_exit(kim_gdata->core_data);798 799 kfree(kim_gdata);800 kim_gdata = NULL;801}802 803static int kim_suspend(struct platform_device *pdev, pm_message_t state)804{805 struct ti_st_plat_data *pdata = pdev->dev.platform_data;806 807 if (pdata->suspend)808 return pdata->suspend(pdev, state);809 810 return 0;811}812 813static int kim_resume(struct platform_device *pdev)814{815 struct ti_st_plat_data *pdata = pdev->dev.platform_data;816 817 if (pdata->resume)818 return pdata->resume(pdev);819 820 return 0;821}822 823/**********************************************************************/824/* entry point for ST KIM module, called in from ST Core */825static struct platform_driver kim_platform_driver = {826 .probe = kim_probe,827 .remove_new = kim_remove,828 .suspend = kim_suspend,829 .resume = kim_resume,830 .driver = {831 .name = "kim",832 },833};834 835module_platform_driver(kim_platform_driver);836 837MODULE_AUTHOR("Pavan Savoy <pavan_savoy@ti.com>");838MODULE_DESCRIPTION("Shared Transport Driver for TI BT/FM/GPS combo chips ");839MODULE_LICENSE("GPL");840