st_kim.c

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/*
 *  Shared Transport Line discipline driver Core
 *  Init Manager module responsible for GPIO control
 *  and firmware download
 *  Copyright (C) 2009-2010 Texas Instruments
 *  Author: Pavan Savoy <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#define pr_fmt(fmt) "(stk) :" fmt
#include <linux/platform_device.h>
#include <linux/jiffies.h>
#include <linux/firmware.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include <linux/gpio.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/sched.h>
#include <linux/sysfs.h>
#include <linux/tty.h>

#include <linux/skbuff.h>
#include <linux/ti_wilink_st.h>
#include <linux/module.h>


#define MAX_ST_DEVICES  3   /* Imagine 1 on each UART for now */
static struct platform_device *st_kim_devices[MAX_ST_DEVICES];

/**********************************************************************/
/* internal functions */

static struct platform_device *st_get_plat_device(int id)
{
    return st_kim_devices[id];
}

static void validate_firmware_response(struct kim_data_s *kim_gdata)
{
    struct sk_buff *skb = kim_gdata->rx_skb;
    if (!skb)
        return;

    /* these magic numbers are the position in the response buffer which
     * allows us to distinguish whether the response is for the read
     * version info. command
     */
    if (skb->data[2] == 0x01 && skb->data[3] == 0x01 &&
            skb->data[4] == 0x10 && skb->data[5] == 0x00) {
        /* fw version response */
        memcpy(kim_gdata->resp_buffer,
                kim_gdata->rx_skb->data,
                kim_gdata->rx_skb->len);
        complete_all(&kim_gdata->kim_rcvd);
        kim_gdata->rx_state = ST_W4_PACKET_TYPE;
        kim_gdata->rx_skb = NULL;
        kim_gdata->rx_count = 0;
    } else if (unlikely(skb->data[5] != 0)) {
        pr_err("no proper response during fw download");
        pr_err("data6 %x", skb->data[5]);
        kfree_skb(skb);
        return;     /* keep waiting for the proper response */
    }
    /* becos of all the script being downloaded */
    complete_all(&kim_gdata->kim_rcvd);
    kfree_skb(skb);
}

/* check for data len received inside kim_int_recv
 * most often hit the last case to update state to waiting for data
 */
static inline int kim_check_data_len(struct kim_data_s *kim_gdata, int len)
{
    register int room = skb_tailroom(kim_gdata->rx_skb);

    pr_debug("len %d room %d", len, room);

    if (!len) {
        validate_firmware_response(kim_gdata);
    } else if (len > room) {
        /* Received packet's payload length is larger.
         * We can't accommodate it in created skb.
         */
        pr_err("Data length is too large len %d room %d", len,
               room);
        kfree_skb(kim_gdata->rx_skb);
    } else {
        /* Packet header has non-zero payload length and
         * we have enough space in created skb. Lets read
         * payload data */
        kim_gdata->rx_state = ST_W4_DATA;
        kim_gdata->rx_count = len;
        return len;
    }

    /* Change ST LL state to continue to process next
     * packet */
    kim_gdata->rx_state = ST_W4_PACKET_TYPE;
    kim_gdata->rx_skb = NULL;
    kim_gdata->rx_count = 0;

    return 0;
}

static void kim_int_recv(struct kim_data_s *kim_gdata,
    const unsigned char *data, long count)
{
    const unsigned char *ptr;
    int len = 0, type = 0;
    unsigned char *plen;

    pr_debug("%s", __func__);
    /* Decode received bytes here */
    ptr = data;
    if (unlikely(ptr == NULL)) {
        pr_err(" received null from TTY ");
        return;
    }

    while (count) {
        if (kim_gdata->rx_count) {
            len = min_t(unsigned int, kim_gdata->rx_count, count);
            memcpy(skb_put(kim_gdata->rx_skb, len), ptr, len);
            kim_gdata->rx_count -= len;
            count -= len;
            ptr += len;

            if (kim_gdata->rx_count)
                continue;

            /* Check ST RX state machine , where are we? */
            switch (kim_gdata->rx_state) {
                /* Waiting for complete packet ? */
            case ST_W4_DATA:
                pr_debug("Complete pkt received");
                validate_firmware_response(kim_gdata);
                kim_gdata->rx_state = ST_W4_PACKET_TYPE;
                kim_gdata->rx_skb = NULL;
                continue;
                /* Waiting for Bluetooth event header ? */
            case ST_W4_HEADER:
                plen =
                (unsigned char *)&kim_gdata->rx_skb->data[1];
                pr_debug("event hdr: plen 0x%02x\n", *plen);
                kim_check_data_len(kim_gdata, *plen);
                continue;
            }   /* end of switch */
        }       /* end of if rx_state */
        switch (*ptr) {
            /* Bluetooth event packet? */
        case 0x04:
            kim_gdata->rx_state = ST_W4_HEADER;
            kim_gdata->rx_count = 2;
            type = *ptr;
            break;
        default:
            pr_info("unknown packet");
            ptr++;
            count--;
            continue;
        }
        ptr++;
        count--;
        kim_gdata->rx_skb =
            alloc_skb(1024+8, GFP_ATOMIC);
        if (!kim_gdata->rx_skb) {
            pr_err("can't allocate mem for new packet");
            kim_gdata->rx_state = ST_W4_PACKET_TYPE;
            kim_gdata->rx_count = 0;
            return;
        }
        skb_reserve(kim_gdata->rx_skb, 8);
        kim_gdata->rx_skb->cb[0] = 4;
        kim_gdata->rx_skb->cb[1] = 0;

    }
    return;
}

static long read_local_version(struct kim_data_s *kim_gdata, char *bts_scr_name)
{
    unsigned short version = 0, chip = 0, min_ver = 0, maj_ver = 0;
    const char read_ver_cmd[] = { 0x01, 0x01, 0x10, 0x00 };

    pr_debug("%s", __func__);

    INIT_COMPLETION(kim_gdata->kim_rcvd);
    if (4 != st_int_write(kim_gdata->core_data, read_ver_cmd, 4)) {
        pr_err("kim: couldn't write 4 bytes");
        return -EIO;
    }

    if (!wait_for_completion_interruptible_timeout(
        &kim_gdata->kim_rcvd, msecs_to_jiffies(CMD_RESP_TIME))) {
        pr_err(" waiting for ver info- timed out ");
        return -ETIMEDOUT;
    }
    INIT_COMPLETION(kim_gdata->kim_rcvd);
    /* the positions 12 & 13 in the response buffer provide with the
     * chip, major & minor numbers
     */

    version =
        MAKEWORD(kim_gdata->resp_buffer[12],
                kim_gdata->resp_buffer[13]);
    chip = (version & 0x7C00) >> 10;
    min_ver = (version & 0x007F);
    maj_ver = (version & 0x0380) >> 7;

    if (version & 0x8000)
        maj_ver |= 0x0008;

    sprintf(bts_scr_name, "TIInit_%d.%d.%d.bts", chip, maj_ver, min_ver);

    /* to be accessed later via sysfs entry */
    kim_gdata->version.full = version;
    kim_gdata->version.chip = chip;
    kim_gdata->version.maj_ver = maj_ver;
    kim_gdata->version.min_ver = min_ver;

    pr_info("%s", bts_scr_name);
    return 0;
}

static void skip_change_remote_baud(unsigned char **ptr, long *len)
{
    unsigned char *nxt_action, *cur_action;
    cur_action = *ptr;

    nxt_action = cur_action + sizeof(struct bts_action) +
        ((struct bts_action *) cur_action)->size;

    if (((struct bts_action *) nxt_action)->type != ACTION_WAIT_EVENT) {
        pr_err("invalid action after change remote baud command");
    } else {
        *ptr = *ptr + sizeof(struct bts_action) +
            ((struct bts_action *)cur_action)->size;
        *len = *len - (sizeof(struct bts_action) +
                ((struct bts_action *)cur_action)->size);
        /* warn user on not commenting these in firmware */
        pr_warn("skipping the wait event of change remote baud");
    }
}

static long download_firmware(struct kim_data_s *kim_gdata)
{
    long err = 0;
    long len = 0;
    unsigned char *ptr = NULL;
    unsigned char *action_ptr = NULL;
    unsigned char bts_scr_name[30] = { 0 }; /* 30 char long bts scr name? */
    int wr_room_space;
    int cmd_size;
    unsigned long timeout;

    err = read_local_version(kim_gdata, bts_scr_name);
    if (err != 0) {
        pr_err("kim: failed to read local ver");
        return err;
    }
    err =
        request_firmware(&kim_gdata->fw_entry, bts_scr_name,
                 &kim_gdata->kim_pdev->dev);
    if (unlikely((err != 0) || (kim_gdata->fw_entry->data == NULL) ||
             (kim_gdata->fw_entry->size == 0))) {
        pr_err(" request_firmware failed(errno %ld) for %s", err,
               bts_scr_name);
        return -EINVAL;
    }
    ptr = (void *)kim_gdata->fw_entry->data;
    len = kim_gdata->fw_entry->size;
    /* bts_header to remove out magic number and
     * version
     */
    ptr += sizeof(struct bts_header);
    len -= sizeof(struct bts_header);

    while (len > 0 && ptr) {
        pr_debug(" action size %d, type %d ",
               ((struct bts_action *)ptr)->size,
               ((struct bts_action *)ptr)->type);

        switch (((struct bts_action *)ptr)->type) {
        case ACTION_SEND_COMMAND:   /* action send */
            pr_debug("S");
            action_ptr = &(((struct bts_action *)ptr)->data[0]);
            if (unlikely
                (((struct hci_command *)action_ptr)->opcode ==
                 0xFF36)) {
                /* ignore remote change
                 * baud rate HCI VS command */
                pr_warn("change remote baud"
                    " rate command in firmware");
                skip_change_remote_baud(&ptr, &len);
                break;
            }
            /*
             * Make sure we have enough free space in uart
             * tx buffer to write current firmware command
             */
            cmd_size = ((struct bts_action *)ptr)->size;
            timeout = jiffies + msecs_to_jiffies(CMD_WR_TIME);
            do {
                wr_room_space =
                    st_get_uart_wr_room(kim_gdata->core_data);
                if (wr_room_space < 0) {
                    pr_err("Unable to get free "
                            "space info from uart tx buffer");
                    release_firmware(kim_gdata->fw_entry);
                    return wr_room_space;
                }
                mdelay(1); /* wait 1ms before checking room */
            } while ((wr_room_space < cmd_size) &&
                    time_before(jiffies, timeout));

            /* Timeout happened ? */
            if (time_after_eq(jiffies, timeout)) {
                pr_err("Timeout while waiting for free "
                        "free space in uart tx buffer");
                release_firmware(kim_gdata->fw_entry);
                return -ETIMEDOUT;
            }
            /* reinit completion before sending for the
             * relevant wait
             */
            INIT_COMPLETION(kim_gdata->kim_rcvd);

            /*
             * Free space found in uart buffer, call st_int_write
             * to send current firmware command to the uart tx
             * buffer.
             */
            err = st_int_write(kim_gdata->core_data,
            ((struct bts_action_send *)action_ptr)->data,
                       ((struct bts_action *)ptr)->size);
            if (unlikely(err < 0)) {
                release_firmware(kim_gdata->fw_entry);
                return err;
            }
            /*
             * Check number of bytes written to the uart tx buffer
             * and requested command write size
             */
            if (err != cmd_size) {
                pr_err("Number of bytes written to uart "
                        "tx buffer are not matching with "
                        "requested cmd write size");
                release_firmware(kim_gdata->fw_entry);
                return -EIO;
            }
            break;
        case ACTION_WAIT_EVENT:  /* wait */
            pr_debug("W");
            if (!wait_for_completion_interruptible_timeout(
                    &kim_gdata->kim_rcvd,
                    msecs_to_jiffies(CMD_RESP_TIME))) {
                pr_err("response timeout during fw download ");
                /* timed out */
                release_firmware(kim_gdata->fw_entry);
                return -ETIMEDOUT;
            }
            INIT_COMPLETION(kim_gdata->kim_rcvd);
            break;
        case ACTION_DELAY:  /* sleep */
            pr_info("sleep command in scr");
            action_ptr = &(((struct bts_action *)ptr)->data[0]);
            mdelay(((struct bts_action_delay *)action_ptr)->msec);
            break;
        }
        len =
            len - (sizeof(struct bts_action) +
               ((struct bts_action *)ptr)->size);
        ptr =
            ptr + sizeof(struct bts_action) +
            ((struct bts_action *)ptr)->size;
    }
    /* fw download complete */
    release_firmware(kim_gdata->fw_entry);
    return 0;
}

/**********************************************************************/
/* functions called from ST core */
/* called from ST Core, when REG_IN_PROGRESS (registration in progress)
 * can be because of
 * 1. response to read local version
 * 2. during send/recv's of firmware download
 */
void st_kim_recv(void *disc_data, const unsigned char *data, long count)
{
    struct st_data_s    *st_gdata = (struct st_data_s *)disc_data;
    struct kim_data_s   *kim_gdata = st_gdata->kim_data;

    /* proceed to gather all data and distinguish read fw version response
     * from other fw responses when data gathering is complete
     */
    kim_int_recv(kim_gdata, data, count);
    return;
}

/* to signal completion of line discipline installation
 * called from ST Core, upon tty_open
 */
void st_kim_complete(void *kim_data)
{
    struct kim_data_s   *kim_gdata = (struct kim_data_s *)kim_data;
    complete(&kim_gdata->ldisc_installed);
}

long st_kim_start(void *kim_data)
{
    long err = 0;
    long retry = POR_RETRY_COUNT;
    struct ti_st_plat_data  *pdata;
    struct kim_data_s   *kim_gdata = (struct kim_data_s *)kim_data;

    pr_info(" %s", __func__);
    pdata = kim_gdata->kim_pdev->dev.platform_data;

    do {
        /* platform specific enabling code here */
        if (pdata->chip_enable)
            pdata->chip_enable(kim_gdata);

        /* re-initialize the completion */
        INIT_COMPLETION(kim_gdata->ldisc_installed);
        /* send notification to UIM */
        kim_gdata->ldisc_install = 1;
        pr_info("ldisc_install = 1");
        sysfs_notify(&kim_gdata->kim_pdev->dev.kobj,
                NULL, "install");
        /* wait for ldisc to be installed */
        err = wait_for_completion_interruptible_timeout(
            &kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));
        if (!err) {
            /* ldisc installation timeout,
             * flush uart, power cycle BT_EN */
            pr_err("ldisc installation timeout");
            err = st_kim_stop(kim_gdata);
            continue;
        } else {
            /* ldisc installed now */
            pr_info("line discipline installed");
            err = download_firmware(kim_gdata);
            if (err != 0) {
                /* ldisc installed but fw download failed,
                 * flush uart & power cycle BT_EN */
                pr_err("download firmware failed");
                err = st_kim_stop(kim_gdata);
                continue;
            } else {    /* on success don't retry */
                break;
            }
        }
    } while (retry--);
    return err;
}

long st_kim_stop(void *kim_data)
{
    long err = 0;
    struct kim_data_s   *kim_gdata = (struct kim_data_s *)kim_data;
    struct ti_st_plat_data  *pdata =
        kim_gdata->kim_pdev->dev.platform_data;
    struct tty_struct   *tty = kim_gdata->core_data->tty;

    INIT_COMPLETION(kim_gdata->ldisc_installed);

    if (tty) {  /* can be called before ldisc is installed */
        /* Flush any pending characters in the driver and discipline. */
        tty_ldisc_flush(tty);
        tty_driver_flush_buffer(tty);
        tty->ops->flush_buffer(tty);
    }

    /* send uninstall notification to UIM */
    pr_info("ldisc_install = 0");
    kim_gdata->ldisc_install = 0;
    sysfs_notify(&kim_gdata->kim_pdev->dev.kobj, NULL, "install");

    /* wait for ldisc to be un-installed */
    err = wait_for_completion_interruptible_timeout(
        &kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));
    if (!err) {     /* timeout */
        pr_err(" timed out waiting for ldisc to be un-installed");
        err = -ETIMEDOUT;
    }

    /* platform specific disable */
    if (pdata->chip_disable)
        pdata->chip_disable(kim_gdata);
    return err;
}

/**********************************************************************/
/* functions called from subsystems */
/* called when debugfs entry is read from */

static int show_version(struct seq_file *s, void *unused)
{
    struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
    seq_printf(s, "%04X %d.%d.%d\n", kim_gdata->version.full,
            kim_gdata->version.chip, kim_gdata->version.maj_ver,
            kim_gdata->version.min_ver);
    return 0;
}

static int show_list(struct seq_file *s, void *unused)
{
    struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
    kim_st_list_protocols(kim_gdata->core_data, s);
    return 0;
}

static ssize_t show_install(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    struct kim_data_s *kim_data = dev_get_drvdata(dev);
    return sprintf(buf, "%d\n", kim_data->ldisc_install);
}

#ifdef DEBUG
static ssize_t store_dev_name(struct device *dev,
        struct device_attribute *attr, const char *buf, size_t count)
{
    struct kim_data_s *kim_data = dev_get_drvdata(dev);
    pr_debug("storing dev name >%s<", buf);
    strncpy(kim_data->dev_name, buf, count);
    pr_debug("stored dev name >%s<", kim_data->dev_name);
    return count;
}

static ssize_t store_baud_rate(struct device *dev,
        struct device_attribute *attr, const char *buf, size_t count)
{
    struct kim_data_s *kim_data = dev_get_drvdata(dev);
    pr_debug("storing baud rate >%s<", buf);
    sscanf(buf, "%ld", &kim_data->baud_rate);
    pr_debug("stored baud rate >%ld<", kim_data->baud_rate);
    return count;
}
#endif  /* if DEBUG */

static ssize_t show_dev_name(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    struct kim_data_s *kim_data = dev_get_drvdata(dev);
    return sprintf(buf, "%s\n", kim_data->dev_name);
}

static ssize_t show_baud_rate(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    struct kim_data_s *kim_data = dev_get_drvdata(dev);
    return sprintf(buf, "%ld\n", kim_data->baud_rate);
}

static ssize_t show_flow_cntrl(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    struct kim_data_s *kim_data = dev_get_drvdata(dev);
    return sprintf(buf, "%d\n", kim_data->flow_cntrl);
}

/* structures specific for sysfs entries */
static struct kobj_attribute ldisc_install =
__ATTR(install, 0444, (void *)show_install, NULL);

static struct kobj_attribute uart_dev_name =
#ifdef DEBUG    /* TODO: move this to debug-fs if possible */
__ATTR(dev_name, 0644, (void *)show_dev_name, (void *)store_dev_name);
#else
__ATTR(dev_name, 0444, (void *)show_dev_name, NULL);
#endif

static struct kobj_attribute uart_baud_rate =
#ifdef DEBUG    /* TODO: move to debugfs */
__ATTR(baud_rate, 0644, (void *)show_baud_rate, (void *)store_baud_rate);
#else
__ATTR(baud_rate, 0444, (void *)show_baud_rate, NULL);
#endif

static struct kobj_attribute uart_flow_cntrl =
__ATTR(flow_cntrl, 0444, (void *)show_flow_cntrl, NULL);

static struct attribute *uim_attrs[] = {
    &ldisc_install.attr,
    &uart_dev_name.attr,
    &uart_baud_rate.attr,
    &uart_flow_cntrl.attr,
    NULL,
};

static struct attribute_group uim_attr_grp = {
    .attrs = uim_attrs,
};

void st_kim_ref(struct st_data_s **core_data, int id)
{
    struct platform_device  *pdev;
    struct kim_data_s   *kim_gdata;
    /* get kim_gdata reference from platform device */
    pdev = st_get_plat_device(id);
    if (!pdev) {
        *core_data = NULL;
        return;
    }
    kim_gdata = dev_get_drvdata(&pdev->dev);
    *core_data = kim_gdata->core_data;
}

static int kim_version_open(struct inode *i, struct file *f)
{
    return single_open(f, show_version, i->i_private);
}

static int kim_list_open(struct inode *i, struct file *f)
{
    return single_open(f, show_list, i->i_private);
}

static const struct file_operations version_debugfs_fops = {
    /* version info */
    .open = kim_version_open,
    .read = seq_read,
    .llseek = seq_lseek,
    .release = single_release,
};
static const struct file_operations list_debugfs_fops = {
    /* protocols info */
    .open = kim_list_open,
    .read = seq_read,
    .llseek = seq_lseek,
    .release = single_release,
};

/**********************************************************************/
/* functions called from platform device driver subsystem
 * need to have a relevant platform device entry in the platform's
 * board-*.c file
 */

static struct dentry *kim_debugfs_dir;
static int kim_probe(struct platform_device *pdev)
{
    long status;
    struct kim_data_s   *kim_gdata;
    struct ti_st_plat_data  *pdata = pdev->dev.platform_data;

    if ((pdev->id != -1) && (pdev->id < MAX_ST_DEVICES)) {
        /* multiple devices could exist */
        st_kim_devices[pdev->id] = pdev;
    } else {
        /* platform's sure about existence of 1 device */
        st_kim_devices[0] = pdev;
    }

    kim_gdata = kzalloc(sizeof(struct kim_data_s), GFP_ATOMIC);
    if (!kim_gdata) {
        pr_err("no mem to allocate");
        return -ENOMEM;
    }
    dev_set_drvdata(&pdev->dev, kim_gdata);

    status = st_core_init(&kim_gdata->core_data);
    if (status != 0) {
        pr_err(" ST core init failed");
        return -EIO;
    }
    /* refer to itself */
    kim_gdata->core_data->kim_data = kim_gdata;

    /* get reference of pdev for request_firmware
     */
    kim_gdata->kim_pdev = pdev;
    init_completion(&kim_gdata->kim_rcvd);
    init_completion(&kim_gdata->ldisc_installed);

    status = sysfs_create_group(&pdev->dev.kobj, &uim_attr_grp);
    if (status) {
        pr_err("failed to create sysfs entries");
        return status;
    }

    /* copying platform data */
    strncpy(kim_gdata->dev_name, pdata->dev_name, UART_DEV_NAME_LEN);
    kim_gdata->flow_cntrl = pdata->flow_cntrl;
    kim_gdata->baud_rate = pdata->baud_rate;
    pr_info("sysfs entries created\n");

    kim_debugfs_dir = debugfs_create_dir("ti-st", NULL);
    if (IS_ERR(kim_debugfs_dir)) {
        pr_err(" debugfs entries creation failed ");
        kim_debugfs_dir = NULL;
        return -EIO;
    }

    debugfs_create_file("version", S_IRUGO, kim_debugfs_dir,
                kim_gdata, &version_debugfs_fops);
    debugfs_create_file("protocols", S_IRUGO, kim_debugfs_dir,
                kim_gdata, &list_debugfs_fops);
    pr_info(" debugfs entries created ");
    return 0;
}

static int kim_remove(struct platform_device *pdev)
{
    struct kim_data_s   *kim_gdata;

    kim_gdata = dev_get_drvdata(&pdev->dev);

    debugfs_remove_recursive(kim_debugfs_dir);
    sysfs_remove_group(&pdev->dev.kobj, &uim_attr_grp);
    pr_info("sysfs entries removed");

    kim_gdata->kim_pdev = NULL;
    st_core_exit(kim_gdata->core_data);

    kfree(kim_gdata);
    kim_gdata = NULL;
    return 0;
}

static int kim_suspend(struct platform_device *pdev, pm_message_t state)
{
    struct ti_st_plat_data  *pdata = pdev->dev.platform_data;

    if (pdata->suspend)
        return pdata->suspend(pdev, state);

    return -EOPNOTSUPP;
}

static int kim_resume(struct platform_device *pdev)
{
    struct ti_st_plat_data  *pdata = pdev->dev.platform_data;

    if (pdata->resume)
        return pdata->resume(pdev);

    return -EOPNOTSUPP;
}

/**********************************************************************/
/* entry point for ST KIM module, called in from ST Core */
static struct platform_driver kim_platform_driver = {
    .probe = kim_probe,
    .remove = kim_remove,
    .suspend = kim_suspend,
    .resume = kim_resume,
    .driver = {
        .name = "kim",
        .owner = THIS_MODULE,
    },
};

module_platform_driver(kim_platform_driver);

MODULE_AUTHOR("Pavan Savoy <[email protected]>");
MODULE_DESCRIPTION("Shared Transport Driver for TI BT/FM/GPS combo chips ");
MODULE_LICENSE("GPL");