USB: usb_storage: add ums-realtek driver

ums_realtek is used to support the power-saving function
for Realtek RTS51xx USB card readers.

Signed-off-by: wwang <wei_wang@realsil.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

5 files changed, 729 insertions, 0 deletions

diff --git a/drivers/usb/storage/Kconfig b/drivers/usb/storage/Kconfig
index 49a489e03716..353aeb44da6a 100644
--- a/drivers/usb/storage/Kconfig
+++ b/drivers/usb/storage/Kconfig
@@ -31,6 +31,16 @@ config USB_STORAGE_DEBUG
           Say Y here in order to have the USB Mass Storage code generate
           verbose debugging messages.
 
+config USB_STORAGE_REALTEK
+        tristate "Realtek Card Reader support"
+        depends on USB_STORAGE
+        help
+          Say Y here to include additional code to support the power-saving function
+          for Realtek RTS51xx USB card readers.
+
+          If this driver is compiled as a module, it will be named ums-realtek.
+
+
 config USB_STORAGE_DATAFAB
         tristate "Datafab Compact Flash Reader support"
         depends on USB_STORAGE
diff --git a/drivers/usb/storage/Makefile b/drivers/usb/storage/Makefile
index fcf14cdc4a04..0d2de971bd91 100644
--- a/drivers/usb/storage/Makefile
+++ b/drivers/usb/storage/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_USB_STORAGE_ISD200)	+= ums-isd200.o
 obj-$(CONFIG_USB_STORAGE_JUMPSHOT)      += ums-jumpshot.o
 obj-$(CONFIG_USB_STORAGE_KARMA)         += ums-karma.o
 obj-$(CONFIG_USB_STORAGE_ONETOUCH)      += ums-onetouch.o
+obj-$(CONFIG_USB_STORAGE_REALTEK)       += ums-realtek.o
 obj-$(CONFIG_USB_STORAGE_SDDR09)        += ums-sddr09.o
 obj-$(CONFIG_USB_STORAGE_SDDR55)        += ums-sddr55.o
 obj-$(CONFIG_USB_STORAGE_USBAT)         += ums-usbat.o
@@ -42,6 +43,7 @@ ums-isd200-y		:= isd200.o
 ums-jumpshot-y          := jumpshot.o
 ums-karma-y             := karma.o
 ums-onetouch-y          := onetouch.o
+ums-realtek-y           := realtek_cr.o
 ums-sddr09-y            := sddr09.o
 ums-sddr55-y            := sddr55.o
 ums-usbat-y             := shuttle_usbat.o
diff --git a/drivers/usb/storage/realtek_cr.c b/drivers/usb/storage/realtek_cr.c
new file mode 100644
index 000000000000..c2bebb3731d3
--- /dev/null
+++ b/drivers/usb/storage/realtek_cr.c
@@ -0,0 +1,675 @@
+/* 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 (wei_wang@realsil.com.cn)
+ *   No. 450, Shenhu Road, Suzhou Industry Park, Suzhou, China
+ */
+
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/kthread.h>
+#include <linux/sched.h>
+#include <linux/workqueue.h>
+#include <linux/kernel.h>
+#include <linux/version.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <linux/cdrom.h>
+
+#include <linux/usb.h>
+#include <linux/slab.h>
+#include <linux/usb_usual.h>
+
+#include "usb.h"
+#include "transport.h"
+#include "protocol.h"
+#include "debug.h"
+
+MODULE_DESCRIPTION("Driver for Realtek USB Card Reader");
+MODULE_AUTHOR("wwang <wei_wang@realsil.com.cn>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.03");
+
+static int auto_delink_en = 1;
+module_param(auto_delink_en, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(auto_delink_en, "enable auto delink");
+
+struct rts51x_status {
+        u16 vid;
+        u16 pid;
+        u8 cur_lun;
+        u8 card_type;
+        u8 total_lun;
+        u16 fw_ver;
+        u8 phy_exist;
+        u8 multi_flag;
+        u8 multi_card;
+        u8 log_exist;
+        union {
+                u8 detailed_type1;
+                u8 detailed_type2;
+        } detailed_type;
+        u8 function[2];
+};
+
+struct rts51x_chip {
+        u16                     vendor_id;
+        u16                     product_id;
+        char                    max_lun;
+
+        struct rts51x_status    *status;
+        int                     status_len;
+
+        u32                     flag;
+};
+
+/* flag definition */
+#define FLIDX_AUTO_DELINK               0x01
+
+#define SCSI_LUN(srb)                   ((srb)->device->lun)
+
+/* Bit Operation */
+#define SET_BIT(data, idx)              ((data) |= 1 << (idx))
+#define CLR_BIT(data, idx)              ((data) &= ~(1 << (idx)))
+#define CHK_BIT(data, idx)              ((data) & (1 << (idx)))
+
+#define SET_AUTO_DELINK(chip)           ((chip)->flag |= FLIDX_AUTO_DELINK)
+#define CLR_AUTO_DELINK(chip)           ((chip)->flag &= ~FLIDX_AUTO_DELINK)
+#define CHK_AUTO_DELINK(chip)           ((chip)->flag & FLIDX_AUTO_DELINK)
+
+#define RTS51X_GET_VID(chip)            ((chip)->vendor_id)
+#define RTS51X_GET_PID(chip)            ((chip)->product_id)
+
+#define FW_VERSION(chip)                ((chip)->status[0].fw_ver)
+#define STATUS_LEN(chip)                ((chip)->status_len)
+
+/* Check card reader function */
+#define SUPPORT_DETAILED_TYPE1(chip)    \
+                CHK_BIT((chip)->status[0].function[0], 1)
+#define SUPPORT_OT(chip)                \
+                CHK_BIT((chip)->status[0].function[0], 2)
+#define SUPPORT_OC(chip)                \
+                CHK_BIT((chip)->status[0].function[0], 3)
+#define SUPPORT_AUTO_DELINK(chip)       \
+                CHK_BIT((chip)->status[0].function[0], 4)
+#define SUPPORT_SDIO(chip)              \
+                CHK_BIT((chip)->status[0].function[1], 0)
+#define SUPPORT_DETAILED_TYPE2(chip)    \
+                CHK_BIT((chip)->status[0].function[1], 1)
+
+#define CHECK_PID(chip, pid)            (RTS51X_GET_PID(chip) == (pid))
+#define CHECK_FW_VER(chip, fw_ver)      (FW_VERSION(chip) == (fw_ver))
+#define CHECK_ID(chip, pid, fw_ver)     \
+                (CHECK_PID((chip), (pid)) && CHECK_FW_VER((chip), (fw_ver)))
+
+#define wait_timeout_x(task_state, msecs)       \
+do {                                            \
+        set_current_state((task_state));        \
+        schedule_timeout((msecs) * HZ / 1000);  \
+} while (0)
+
+#define wait_timeout(msecs)             \
+                wait_timeout_x(TASK_INTERRUPTIBLE, (msecs))
+
+static int init_realtek_cr(struct us_data *us);
+
+/*
+ * The table of devices
+ */
+#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
+                    vendorName, productName, useProtocol, useTransport, \
+                    initFunction, flags) \
+{\
+        USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
+        .driver_info = (flags)|(USB_US_TYPE_STOR<<24)\
+}
+
+struct usb_device_id realtek_cr_ids[] = {
+#       include "unusual_realtek.h"
+        { }             /* Terminating entry */
+};
+MODULE_DEVICE_TABLE(usb, realtek_cr_ids);
+
+#undef UNUSUAL_DEV
+
+/*
+ * The flags table
+ */
+#define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
+                    vendor_name, product_name, use_protocol, use_transport, \
+                    init_function, Flags) \
+{ \
+        .vendorName = vendor_name,      \
+        .productName = product_name,    \
+        .useProtocol = use_protocol,    \
+        .useTransport = use_transport,  \
+        .initFunction = init_function,  \
+}
+
+static struct us_unusual_dev realtek_cr_unusual_dev_list[] = {
+#       include "unusual_realtek.h"
+        { }             /* Terminating entry */
+};
+
+#undef UNUSUAL_DEV
+
+static int rts51x_bulk_transport(struct us_data *us, u8 lun,
+                                 u8 *cmd, int cmd_len, u8 *buf, int buf_len,
+                                 enum dma_data_direction dir, int *act_len)
+{
+        struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf;
+        struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap *) us->iobuf;
+        int result;
+        unsigned int residue;
+        unsigned int cswlen;
+        unsigned int cbwlen = US_BULK_CB_WRAP_LEN;
+
+        /* set up the command wrapper */
+        bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN);
+        bcb->DataTransferLength = cpu_to_le32(buf_len);
+        bcb->Flags = (dir == DMA_FROM_DEVICE) ? 1 << 7 : 0;
+        bcb->Tag = ++us->tag;
+        bcb->Lun = lun;
+        bcb->Length = cmd_len;
+
+        /* copy the command payload */
+        memset(bcb->CDB, 0, sizeof(bcb->CDB));
+        memcpy(bcb->CDB, cmd, bcb->Length);
+
+        /* send it to out endpoint */
+        result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
+                                bcb, cbwlen, NULL);
+        if (result != USB_STOR_XFER_GOOD)
+                return USB_STOR_TRANSPORT_ERROR;
+
+        /* DATA STAGE */
+        /* send/receive data payload, if there is any */
+
+        if (buf && buf_len) {
+                unsigned int pipe = (dir == DMA_FROM_DEVICE) ?
+                                us->recv_bulk_pipe : us->send_bulk_pipe;
+                result = usb_stor_bulk_transfer_buf(us, pipe,
+                                buf, buf_len, NULL);
+                if (result == USB_STOR_XFER_ERROR)
+                        return USB_STOR_TRANSPORT_ERROR;
+        }
+
+        /* get CSW for device status */
+        result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
+                                bcs, US_BULK_CS_WRAP_LEN, &cswlen);
+        if (result != USB_STOR_XFER_GOOD)
+                return USB_STOR_TRANSPORT_ERROR;
+
+        /* check bulk status */
+        if (bcs->Signature != cpu_to_le32(US_BULK_CS_SIGN)) {
+                US_DEBUGP("Signature mismatch: got %08X, expecting %08X\n",
+                          le32_to_cpu(bcs->Signature),
+                          US_BULK_CS_SIGN);
+                return USB_STOR_TRANSPORT_ERROR;
+        }
+
+        residue = bcs->Residue;
+        if (bcs->Tag != us->tag)
+                return USB_STOR_TRANSPORT_ERROR;
+
+        /* try to compute the actual residue, based on how much data
+         * was really transferred and what the device tells us */
+        if (residue)
+                residue = residue < buf_len ? residue : buf_len;
+
+        if (act_len)
+                *act_len = buf_len - residue;
+
+        /* based on the status code, we report good or bad */
+        switch (bcs->Status) {
+        case US_BULK_STAT_OK:
+                /* command good -- note that data could be short */
+                return USB_STOR_TRANSPORT_GOOD;
+
+        case US_BULK_STAT_FAIL:
+                /* command failed */
+                return USB_STOR_TRANSPORT_FAILED;
+
+        case US_BULK_STAT_PHASE:
+                /* phase error -- note that a transport reset will be
+                        * invoked by the invoke_transport() function
+                        */
+                return USB_STOR_TRANSPORT_ERROR;
+        }
+
+        /* we should never get here, but if we do, we're in trouble */
+        return USB_STOR_TRANSPORT_ERROR;
+}
+
+/* Determine what the maximum LUN supported is */
+static int rts51x_get_max_lun(struct us_data *us)
+{
+        int result;
+
+        /* issue the command */
+        us->iobuf[0] = 0;
+        result = usb_stor_control_msg(us, us->recv_ctrl_pipe,
+                                 US_BULK_GET_MAX_LUN,
+                                 USB_DIR_IN | USB_TYPE_CLASS |
+                                 USB_RECIP_INTERFACE,
+                                 0, us->ifnum, us->iobuf, 1, 10*HZ);
+
+        US_DEBUGP("GetMaxLUN command result is %d, data is %d\n",
+                  result, us->iobuf[0]);
+
+        /* if we have a successful request, return the result */
+        if (result > 0)
+                return us->iobuf[0];
+
+        return 0;
+}
+
+static int rts51x_read_mem(struct us_data *us, u16 addr, u8 *data, u16 len)
+{
+        int retval;
+        u8 cmnd[12] = {0};
+
+        US_DEBUGP("%s, addr = 0x%x, len = %d\n", __func__, addr, len);
+
+        cmnd[0] = 0xF0;
+        cmnd[1] = 0x0D;
+        cmnd[2] = (u8)(addr >> 8);
+        cmnd[3] = (u8)addr;
+        cmnd[4] = (u8)(len >> 8);
+        cmnd[5] = (u8)len;
+
+        retval = rts51x_bulk_transport(us, 0, cmnd, 12,
+                                       data, len, DMA_FROM_DEVICE, NULL);
+        if (retval != USB_STOR_TRANSPORT_GOOD)
+                return -EIO;
+
+        return 0;
+}
+
+static int rts51x_write_mem(struct us_data *us, u16 addr, u8 *data, u16 len)
+{
+        int retval;
+        u8 cmnd[12] = {0};
+
+        US_DEBUGP("%s, addr = 0x%x, len = %d\n", __func__, addr, len);
+
+        cmnd[0] = 0xF0;
+        cmnd[1] = 0x0E;
+        cmnd[2] = (u8)(addr >> 8);
+        cmnd[3] = (u8)addr;
+        cmnd[4] = (u8)(len >> 8);
+        cmnd[5] = (u8)len;
+
+        retval = rts51x_bulk_transport(us, 0, cmnd, 12,
+                                       data, len, DMA_TO_DEVICE, NULL);
+        if (retval != USB_STOR_TRANSPORT_GOOD)
+                return -EIO;
+
+        return 0;
+}
+
+static int rts51x_read_status(struct us_data *us,
+                              u8 lun, u8 *status, int len, int *actlen)
+{
+        int retval;
+        u8 cmnd[12] = {0};
+
+        US_DEBUGP("%s, lun = %d\n", __func__, lun);
+
+        cmnd[0] = 0xF0;
+        cmnd[1] = 0x09;
+
+        retval = rts51x_bulk_transport(us, lun, cmnd, 12,
+                                       status, len, DMA_FROM_DEVICE, actlen);
+        if (retval != USB_STOR_TRANSPORT_GOOD)
+                return -EIO;
+
+        return 0;
+}
+
+static int rts51x_check_status(struct us_data *us, u8 lun)
+{
+        struct rts51x_chip *chip = (struct rts51x_chip *)(us->extra);
+        int retval;
+        u8 buf[16];
+
+        retval = rts51x_read_status(us, lun, buf, 16, &(chip->status_len));
+        if (retval < 0)
+                return -EIO;
+
+        US_DEBUGP("chip->status_len = %d\n", chip->status_len);
+
+        chip->status[lun].vid = ((u16)buf[0] << 8) | buf[1];
+        chip->status[lun].pid = ((u16)buf[2] << 8) | buf[3];
+        chip->status[lun].cur_lun = buf[4];
+        chip->status[lun].card_type = buf[5];
+        chip->status[lun].total_lun = buf[6];
+        chip->status[lun].fw_ver = ((u16)buf[7] << 8) | buf[8];
+        chip->status[lun].phy_exist = buf[9];
+        chip->status[lun].multi_flag = buf[10];
+        chip->status[lun].multi_card = buf[11];
+        chip->status[lun].log_exist = buf[12];
+        if (chip->status_len == 16) {
+                chip->status[lun].detailed_type.detailed_type1 = buf[13];
+                chip->status[lun].function[0] = buf[14];
+                chip->status[lun].function[1] = buf[15];
+        }
+
+        return 0;
+}
+
+static int enable_oscillator(struct us_data *us)
+{
+        int retval;
+        u8 value;
+
+        retval = rts51x_read_mem(us, 0xFE77, &value, 1);
+        if (retval < 0)
+                return -EIO;
+
+        value |= 0x04;
+        retval = rts51x_write_mem(us, 0xFE77, &value, 1);
+        if (retval < 0)
+                return -EIO;
+
+        retval = rts51x_read_mem(us, 0xFE77, &value, 1);
+        if (retval < 0)
+                return -EIO;
+
+        if (!(value & 0x04))
+                return -EIO;
+
+        return 0;
+}
+
+static int do_config_autodelink(struct us_data *us, int enable, int force)
+{
+        int retval;
+        u8 value;
+
+        retval = rts51x_read_mem(us, 0xFE47, &value, 1);
+        if (retval < 0)
+                return -EIO;
+
+        if (enable) {
+                if (force)
+                        value |= 0x03;
+                else
+                        value |= 0x01;
+        } else {
+                value &= ~0x03;
+        }
+
+        US_DEBUGP("In %s,set 0xfe47 to 0x%x\n", __func__, value);
+
+        retval = rts51x_write_mem(us, 0xFE47, &value, 1);
+        if (retval < 0)
+                return -EIO;
+
+        return 0;
+}
+
+static int config_autodelink_after_power_on(struct us_data *us)
+{
+        struct rts51x_chip *chip = (struct rts51x_chip *)(us->extra);
+        int retval;
+        u8 value;
+
+        if (!CHK_AUTO_DELINK(chip))
+                return 0;
+
+        retval = rts51x_read_mem(us, 0xFE47, &value, 1);
+        if (retval < 0)
+                return -EIO;
+
+        if (auto_delink_en) {
+                CLR_BIT(value, 0);
+                CLR_BIT(value, 1);
+                SET_BIT(value, 2);
+
+                if (CHECK_ID(chip, 0x0138, 0x3882))
+                        CLR_BIT(value, 2);
+
+                SET_BIT(value, 7);
+
+                retval = rts51x_write_mem(us, 0xFE47, &value, 1);
+                if (retval < 0)
+                        return -EIO;
+
+                retval = enable_oscillator(us);
+                if (retval == 0)
+                        (void)do_config_autodelink(us, 1, 0);
+        } else {
+                /* Autodelink controlled by firmware */
+
+                SET_BIT(value, 2);
+
+                if (CHECK_ID(chip, 0x0138, 0x3882))
+                        CLR_BIT(value, 2);
+
+                if (CHECK_ID(chip, 0x0159, 0x5889) ||
+                                CHECK_ID(chip, 0x0138, 0x3880)) {
+                        CLR_BIT(value, 0);
+                        CLR_BIT(value, 7);
+                }
+
+                retval = rts51x_write_mem(us, 0xFE47, &value, 1);
+                if (retval < 0)
+                        return -EIO;
+
+                if (CHECK_ID(chip, 0x0159, 0x5888)) {
+                        value = 0xFF;
+                        retval = rts51x_write_mem(us, 0xFE79, &value, 1);
+                        if (retval < 0)
+                                return -EIO;
+
+                        value = 0x01;
+                        retval = rts51x_write_mem(us, 0x48, &value, 1);
+                        if (retval < 0)
+                                return -EIO;
+                }
+        }
+
+        return 0;
+}
+
+static int config_autodelink_before_power_down(struct us_data *us)
+{
+        struct rts51x_chip *chip = (struct rts51x_chip *)(us->extra);
+        int retval;
+        u8 value;
+
+        if (!CHK_AUTO_DELINK(chip))
+                return 0;
+
+        if (auto_delink_en) {
+                retval = rts51x_read_mem(us, 0xFE77, &value, 1);
+                if (retval < 0)
+                        return -EIO;
+
+                SET_BIT(value, 2);
+                retval = rts51x_write_mem(us, 0xFE77, &value, 1);
+                if (retval < 0)
+                        return -EIO;
+
+                if (CHECK_ID(chip, 0x0159, 0x5888)) {
+                        value = 0x01;
+                        retval = rts51x_write_mem(us, 0x48, &value, 1);
+                        if (retval < 0)
+                                return -EIO;
+                }
+
+                retval = rts51x_read_mem(us, 0xFE47, &value, 1);
+                if (retval < 0)
+                        return -EIO;
+
+                SET_BIT(value, 0);
+                if (CHECK_ID(chip, 0x0138, 0x3882))
+                        SET_BIT(value, 2);
+                retval = rts51x_write_mem(us, 0xFE77, &value, 1);
+                if (retval < 0)
+                        return -EIO;
+        } else {
+                if (CHECK_ID(chip, 0x0159, 0x5889) ||
+                                CHECK_ID(chip, 0x0138, 0x3880) ||
+                                CHECK_ID(chip, 0x0138, 0x3882)) {
+                        retval = rts51x_read_mem(us, 0xFE47, &value, 1);
+                        if (retval < 0)
+                                return -EIO;
+
+                        if (CHECK_ID(chip, 0x0159, 0x5889) ||
+                                        CHECK_ID(chip, 0x0138, 0x3880)) {
+                                SET_BIT(value, 0);
+                                SET_BIT(value, 7);
+                        }
+
+                        if (CHECK_ID(chip, 0x0138, 0x3882))
+                                SET_BIT(value, 2);
+
+                        retval = rts51x_write_mem(us, 0xFE47, &value, 1);
+                        if (retval < 0)
+                                return -EIO;
+                }
+
+                if (CHECK_ID(chip, 0x0159, 0x5888)) {
+                        value = 0x01;
+                        retval = rts51x_write_mem(us, 0x48, &value, 1);
+                        if (retval < 0)
+                                return -EIO;
+                }
+        }
+
+        return 0;
+}
+
+static void realtek_cr_destructor(void *extra)
+{
+        struct rts51x_chip *chip = (struct rts51x_chip *)extra;
+
+        if (!chip)
+                return;
+
+        kfree(chip->status);
+}
+
+#ifdef CONFIG_PM
+void realtek_pm_hook(struct us_data *us, int pm_state)
+{
+        if (pm_state == US_SUSPEND)
+                (void)config_autodelink_before_power_down(us);
+}
+#endif
+
+static int init_realtek_cr(struct us_data *us)
+{
+        struct rts51x_chip *chip;
+        int size, i, retval;
+
+        chip = kzalloc(sizeof(struct rts51x_chip), GFP_KERNEL);
+        if (!chip)
+                return -ENOMEM;
+
+        us->extra = chip;
+        us->extra_destructor = realtek_cr_destructor;
+#ifdef CONFIG_PM
+        us->suspend_resume_hook = realtek_pm_hook;
+#endif
+
+        us->max_lun = chip->max_lun = rts51x_get_max_lun(us);
+
+        US_DEBUGP("chip->max_lun = %d\n", chip->max_lun);
+
+        size = (chip->max_lun + 1) * sizeof(struct rts51x_status);
+        chip->status = kzalloc(size, GFP_KERNEL);
+        if (!chip->status)
+                goto INIT_FAIL;
+
+        for (i = 0; i <= (int)(chip->max_lun); i++) {
+                retval = rts51x_check_status(us, (u8)i);
+                if (retval < 0)
+                        goto INIT_FAIL;
+        }
+
+        if (CHECK_FW_VER(chip, 0x5888) || CHECK_FW_VER(chip, 0x5889) ||
+                        CHECK_FW_VER(chip, 0x5901))
+                SET_AUTO_DELINK(chip);
+        if (STATUS_LEN(chip) == 16) {
+                if (SUPPORT_AUTO_DELINK(chip))
+                        SET_AUTO_DELINK(chip);
+        }
+
+        US_DEBUGP("chip->flag = 0x%x\n", chip->flag);
+
+        (void)config_autodelink_after_power_on(us);
+
+        return 0;
+
+INIT_FAIL:
+        if (us->extra) {
+                kfree(chip->status);
+                kfree(us->extra);
+                us->extra = NULL;
+        }
+
+        return -EIO;
+}
+
+static int realtek_cr_probe(struct usb_interface *intf,
+                         const struct usb_device_id *id)
+{
+        struct us_data *us;
+        int result;
+
+        US_DEBUGP("Probe Realtek Card Reader!\n");
+
+        result = usb_stor_probe1(&us, intf, id,
+                        (id - realtek_cr_ids) + realtek_cr_unusual_dev_list);
+        if (result)
+                return result;
+
+        result = usb_stor_probe2(us);
+        return result;
+}
+
+static struct usb_driver realtek_cr_driver = {
+        .name =         "ums-realtek",
+        .probe =        realtek_cr_probe,
+        .disconnect =   usb_stor_disconnect,
+        .suspend =      usb_stor_suspend,
+        .resume =       usb_stor_resume,
+        .reset_resume = usb_stor_reset_resume,
+        .pre_reset =    usb_stor_pre_reset,
+        .post_reset =   usb_stor_post_reset,
+        .id_table =     realtek_cr_ids,
+        .soft_unbind =  1,
+};
+
+static int __init realtek_cr_init(void)
+{
+        return usb_register(&realtek_cr_driver);
+}
+
+static void __exit realtek_cr_exit(void)
+{
+        usb_deregister(&realtek_cr_driver);
+}
+
+module_init(realtek_cr_init);
+module_exit(realtek_cr_exit);
diff --git a/drivers/usb/storage/unusual_realtek.h b/drivers/usb/storage/unusual_realtek.h
new file mode 100644
index 000000000000..3236e0328516
--- /dev/null
+++ b/drivers/usb/storage/unusual_realtek.h
@@ -0,0 +1,41 @@
+/* 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 (wei_wang@realsil.com.cn)
+ *   No. 450, Shenhu Road, Suzhou Industry Park, Suzhou, China
+ */
+
+#if defined(CONFIG_USB_STORAGE_REALTEK) || \
+                defined(CONFIG_USB_STORAGE_REALTEK_MODULE)
+
+UNUSUAL_DEV(0x0bda, 0x0159, 0x0000, 0x9999,
+                "Realtek",
+                "USB Card Reader",
+                USB_SC_SCSI, USB_PR_BULK, init_realtek_cr, 0),
+
+UNUSUAL_DEV(0x0bda, 0x0158, 0x0000, 0x9999,
+                "Realtek",
+                "USB Card Reader",
+                USB_SC_SCSI, USB_PR_BULK, init_realtek_cr, 0),
+
+UNUSUAL_DEV(0x0bda, 0x0138, 0x0000, 0x9999,
+                "Realtek",
+                "USB Card Reader",
+                USB_SC_SCSI, USB_PR_BULK, init_realtek_cr, 0),
+
+#endif  /* defined(CONFIG_USB_STORAGE_REALTEK) || ... */
diff --git a/drivers/usb/storage/usual-tables.c b/drivers/usb/storage/usual-tables.c
index 468bde7d1971..4293077c01aa 100644
--- a/drivers/usb/storage/usual-tables.c
+++ b/drivers/usb/storage/usual-tables.c
@@ -85,6 +85,7 @@ static struct ignore_entry ignore_ids[] = {
 #       include "unusual_jumpshot.h"
 #       include "unusual_karma.h"
 #       include "unusual_onetouch.h"
+#       include "unusual_realtek.h"
 #       include "unusual_sddr09.h"
 #       include "unusual_sddr55.h"
 #       include "unusual_usbat.h"