rts51x_fop.c

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/* Driver for Realtek RTS51xx USB card reader
 *
 * Copyright(c) 2009 Realtek Semiconductor Corp. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 * Author:
 *   wwang ([email protected])
 *   No. 450, Shenhu Road, Suzhou Industry Park, Suzhou, China
 * Maintainer:
 *   Edwin Rong ([email protected])
 *   No. 450, Shenhu Road, Suzhou Industry Park, Suzhou, China
 */

#include "rts51x.h"

#ifdef SUPPORT_FILE_OP

#include <linux/types.h>
#include <linux/stat.h>
#include <linux/kref.h>
#include <linux/slab.h>

#include "rts51x_chip.h"
#include "rts51x_card.h"
#include "rts51x_fop.h"
#include "sd_cprm.h"

#define RTS5139_IOC_MAGIC       0x39

#define RTS5139_IOC_SD_DIRECT       _IOWR(RTS5139_IOC_MAGIC, 0xA0, int)
#define RTS5139_IOC_SD_GET_RSP      _IOWR(RTS5139_IOC_MAGIC, 0xA1, int)

static int rts51x_sd_direct_cmnd(struct rts51x_chip *chip,
                 struct sd_direct_cmnd *cmnd)
{
    int retval;
    u8 dir, cmd12, standby, acmd, cmd_idx, rsp_code;
    u8 *buf;
    u32 arg, len;

    dir = (cmnd->cmnd[0] >> 3) & 0x03;
    cmd12 = (cmnd->cmnd[0] >> 2) & 0x01;
    standby = (cmnd->cmnd[0] >> 1) & 0x01;
    acmd = cmnd->cmnd[0] & 0x01;
    cmd_idx = cmnd->cmnd[1];
    arg = ((u32) (cmnd->cmnd[2]) << 24) | ((u32) (cmnd->cmnd[3]) << 16) |
        ((u32) (cmnd->cmnd[4]) << 8) | cmnd->cmnd[5];
    len =
        ((u32) (cmnd->cmnd[6]) << 16) | ((u32) (cmnd->cmnd[7]) << 8) |
        cmnd->cmnd[8];
    rsp_code = cmnd->cmnd[9];

    if (dir) {
        if (!cmnd->buf || (cmnd->buf_len < len))
            TRACE_RET(chip, STATUS_FAIL);
    }

    switch (dir) {
    case 0:
        /* No data */
        retval = ext_sd_execute_no_data(chip, chip->card2lun[SD_CARD],
                        cmd_idx, standby, acmd,
                        rsp_code, arg);
        if (retval != TRANSPORT_GOOD)
            TRACE_RET(chip, STATUS_FAIL);
        break;

    case 1:
        /* Read from card */
        buf = kzalloc(cmnd->buf_len, GFP_KERNEL);
        if (!buf)
            TRACE_RET(chip, STATUS_NOMEM);

        retval = ext_sd_execute_read_data(chip, chip->card2lun[SD_CARD],
                          cmd_idx, cmd12, standby, acmd,
                          rsp_code, arg, len, buf,
                          cmnd->buf_len, 0);
        if (retval != TRANSPORT_GOOD) {
            kfree(buf);
            TRACE_RET(chip, STATUS_FAIL);
        }

        retval =
            copy_to_user((void *)cmnd->buf, (void *)buf, cmnd->buf_len);
        if (retval) {
            kfree(buf);
            TRACE_RET(chip, STATUS_NOMEM);
        }

        kfree(buf);
        break;

    case 2:
        /* Write to card */
        buf = kmalloc(cmnd->buf_len, GFP_KERNEL);
        if (!buf)
            TRACE_RET(chip, STATUS_NOMEM);

        retval =
            copy_from_user((void *)buf, (void *)cmnd->buf,
                   cmnd->buf_len);
        if (retval) {
            kfree(buf);
            TRACE_RET(chip, STATUS_NOMEM);
        }

        retval =
            ext_sd_execute_write_data(chip, chip->card2lun[SD_CARD],
                          cmd_idx, cmd12, standby, acmd,
                          rsp_code, arg, len, buf,
                          cmnd->buf_len, 0);
        if (retval != TRANSPORT_GOOD) {
            kfree(buf);
            TRACE_RET(chip, STATUS_FAIL);
        }

        kfree(buf);

        break;

    default:
        TRACE_RET(chip, STATUS_FAIL);
    }

    return STATUS_SUCCESS;
}

static int rts51x_sd_get_rsp(struct rts51x_chip *chip, struct sd_rsp *rsp)
{
    struct sd_info *sd_card = &(chip->sd_card);
    int count = 0, retval;

    if (sd_card->pre_cmd_err) {
        sd_card->pre_cmd_err = 0;
        TRACE_RET(chip, STATUS_FAIL);
    }

    if (sd_card->last_rsp_type == SD_RSP_TYPE_R0)
        TRACE_RET(chip, STATUS_FAIL);
    else if (sd_card->last_rsp_type == SD_RSP_TYPE_R2)
        count = (rsp->rsp_len < 17) ? rsp->rsp_len : 17;
    else
        count = (rsp->rsp_len < 6) ? rsp->rsp_len : 6;

    retval = copy_to_user((void *)rsp->rsp, (void *)sd_card->rsp, count);
    if (retval)
        TRACE_RET(chip, STATUS_NOMEM);

    RTS51X_DEBUGP("Response length: %d\n", count);
    RTS51X_DEBUGP("Response: 0x%x 0x%x 0x%x 0x%x\n",
               sd_card->rsp[0], sd_card->rsp[1], sd_card->rsp[2],
               sd_card->rsp[3]);

    return STATUS_SUCCESS;
}

int rts51x_open(struct inode *inode, struct file *filp)
{
    struct rts51x_chip *chip;
    struct usb_interface *interface;
    int subminor;
    int retval = 0;

    subminor = iminor(inode);

    interface = usb_find_interface(&rts51x_driver, subminor);
    if (!interface) {
        RTS51X_DEBUGP("%s - error, can't find device for minor %d\n",
                   __func__, subminor);
        retval = -ENODEV;
        goto exit;
    }

    chip = (struct rts51x_chip *)usb_get_intfdata(interface);
    if (!chip) {
        RTS51X_DEBUGP("Can't find chip\n");
        retval = -ENODEV;
        goto exit;
    }

    /* Increase our reference to the host */
    scsi_host_get(rts51x_to_host(chip));

    /* lock the device pointers */
    mutex_lock(&(chip->usb->dev_mutex));

    /* save our object in the file's private structure */
    filp->private_data = chip;

    /* unlock the device pointers */
    mutex_unlock(&chip->usb->dev_mutex);

exit:
    return retval;
}

int rts51x_release(struct inode *inode, struct file *filp)
{
    struct rts51x_chip *chip;

    chip = (struct rts51x_chip *)filp->private_data;
    if (chip == NULL)
        return -ENODEV;

    /* Drop our reference to the host; the SCSI core will free it
     * (and "chip" along with it) when the refcount becomes 0. */
    scsi_host_put(rts51x_to_host(chip));

    return 0;
}

ssize_t rts51x_read(struct file *filp, char __user *buf, size_t count,
            loff_t *f_pos)
{
    return 0;
}

ssize_t rts51x_write(struct file *filp, const char __user *buf, size_t count,
             loff_t *f_pos)
{
    return 0;
}

long rts51x_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
    struct rts51x_chip *chip;
    struct sd_direct_cmnd cmnd;
    struct sd_rsp rsp;
    int retval = 0;

    chip = (struct rts51x_chip *)filp->private_data;
    if (chip == NULL)
        return -ENODEV;

    /* lock the device pointers */
    mutex_lock(&(chip->usb->dev_mutex));

    switch (cmd) {
    case RTS5139_IOC_SD_DIRECT:
        retval =
            copy_from_user((void *)&cmnd, (void *)arg,
                   sizeof(struct sd_direct_cmnd));
        if (retval) {
            retval = -ENOMEM;
            TRACE_GOTO(chip, exit);
        }
        retval = rts51x_sd_direct_cmnd(chip, &cmnd);
        if (retval != STATUS_SUCCESS) {
            retval = -EIO;
            TRACE_GOTO(chip, exit);
        }
        break;

    case RTS5139_IOC_SD_GET_RSP:
        retval =
            copy_from_user((void *)&rsp, (void *)arg,
                   sizeof(struct sd_rsp));
        if (retval) {
            retval = -ENOMEM;
            TRACE_GOTO(chip, exit);
        }
        retval = rts51x_sd_get_rsp(chip, &rsp);
        if (retval != STATUS_SUCCESS) {
            retval = -EIO;
            TRACE_GOTO(chip, exit);
        }
        break;

    default:
        break;
    }

exit:
    /* unlock the device pointers */
    mutex_unlock(&chip->usb->dev_mutex);

    return retval;
}

#endif