/**
 * Copyright (c) 2014 Redpine Signals Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

#include <linux/module.h>
#include "rsi_sdio.h"
#include "rsi_common.h"

/**
 * rsi_sdio_set_cmd52_arg() - This function prepares cmd 52 read/write arg.
 * @rw: Read/write
 * @func: function number
 * @raw: indicates whether to perform read after write
 * @address: address to which to read/write
 * @writedata: data to write
 *
 * Return: argument
 */
static u32 rsi_sdio_set_cmd52_arg(bool rw,
                                  u8 func,
                                  u8 raw,
                                  u32 address,
                                  u8 writedata)
{
        return ((rw & 1) << 31) | ((func & 0x7) << 28) |
                ((raw & 1) << 27) | (1 << 26) |
                ((address & 0x1FFFF) << 9) | (1 << 8) |
                (writedata & 0xFF);
}

/**
 * rsi_cmd52writebyte() - This function issues cmd52 byte write onto the card.
 * @card: Pointer to the mmc_card.
 * @address: Address to write.
 * @byte: Data to write.
 *
 * Return: Write status.
 */
static int rsi_cmd52writebyte(struct mmc_card *card,
                              u32 address,
                              u8 byte)
{
        struct mmc_command io_cmd;
        u32 arg;

        memset(&io_cmd, 0, sizeof(io_cmd));
        arg = rsi_sdio_set_cmd52_arg(1, 0, 0, address, byte);
        io_cmd.opcode = SD_IO_RW_DIRECT;
        io_cmd.arg = arg;
        io_cmd.flags = MMC_RSP_R5 | MMC_CMD_AC;

        return mmc_wait_for_cmd(card->host, &io_cmd, 0);
}

/**
 * rsi_cmd52readbyte() - This function issues cmd52 byte read onto the card.
 * @card: Pointer to the mmc_card.
 * @address: Address to read from.
 * @byte: Variable to store read value.
 *
 * Return: Read status.
 */
static int rsi_cmd52readbyte(struct mmc_card *card,
                             u32 address,
                             u8 *byte)
{
        struct mmc_command io_cmd;
        u32 arg;
        int err;

        memset(&io_cmd, 0, sizeof(io_cmd));
        arg = rsi_sdio_set_cmd52_arg(0, 0, 0, address, 0);
        io_cmd.opcode = SD_IO_RW_DIRECT;
        io_cmd.arg = arg;
        io_cmd.flags = MMC_RSP_R5 | MMC_CMD_AC;

        err = mmc_wait_for_cmd(card->host, &io_cmd, 0);
        if ((!err) && (byte))
                *byte =  io_cmd.resp[0] & 0xFF;
        return err;
}

/**
 * rsi_issue_sdiocommand() - This function issues sdio commands.
 * @func: Pointer to the sdio_func structure.
 * @opcode: Opcode value.
 * @arg: Arguments to pass.
 * @flags: Flags which are set.
 * @resp: Pointer to store response.
 *
 * Return: err: command status as 0 or -1.
 */
static int rsi_issue_sdiocommand(struct sdio_func *func,
                                 u32 opcode,
                                 u32 arg,
                                 u32 flags,
                                 u32 *resp)
{
        struct mmc_command cmd;
        struct mmc_host *host;
        int err;

        host = func->card->host;

        memset(&cmd, 0, sizeof(struct mmc_command));
        cmd.opcode = opcode;
        cmd.arg = arg;
        cmd.flags = flags;
        err = mmc_wait_for_cmd(host, &cmd, 3);

        if ((!err) && (resp))
                *resp = cmd.resp[0];

        return err;
}

/**
 * rsi_handle_interrupt() - This function is called upon the occurence
 *                          of an interrupt.
 * @function: Pointer to the sdio_func structure.
 *
 * Return: None.
 */
static void rsi_handle_interrupt(struct sdio_func *function)
{
        struct rsi_hw *adapter = sdio_get_drvdata(function);

        sdio_release_host(function);
        rsi_interrupt_handler(adapter);
        sdio_claim_host(function);
}

/**
 * rsi_reset_card() - This function resets and re-initializes the card.
 * @pfunction: Pointer to the sdio_func structure.
 *
 * Return: None.
 */
static void rsi_reset_card(struct sdio_func *pfunction)
{
        int ret = 0;
        int err;
        struct mmc_card *card = pfunction->card;
        struct mmc_host *host = card->host;
        s32 bit = (fls(host->ocr_avail) - 1);
        u8 cmd52_resp;
        u32 clock, resp, i;
        u16 rca;

        /* Reset 9110 chip */
        ret = rsi_cmd52writebyte(pfunction->card,
                                 SDIO_CCCR_ABORT,
                                 (1 << 3));

        /* Card will not send any response as it is getting reset immediately
         * Hence expect a timeout status from host controller
         */
        if (ret != -ETIMEDOUT)
                rsi_dbg(ERR_ZONE, "%s: Reset failed : %d\n", __func__, ret);

        /* Wait for few milli seconds to get rid of residue charges if any */
        msleep(20);

        /* Initialize the SDIO card */
        host->ios.vdd = bit;
        host->ios.chip_select = MMC_CS_DONTCARE;
        host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
        host->ios.power_mode = MMC_POWER_UP;
        host->ios.bus_width = MMC_BUS_WIDTH_1;
        host->ios.timing = MMC_TIMING_LEGACY;
        host->ops->set_ios(host, &host->ios);

        /*
         * This delay should be sufficient to allow the power supply
         * to reach the minimum voltage.
         */
        msleep(20);

        host->ios.clock = host->f_min;
        host->ios.power_mode = MMC_POWER_ON;
        host->ops->set_ios(host, &host->ios);

        /*
         * This delay must be at least 74 clock sizes, or 1 ms, or the
         * time required to reach a stable voltage.
         */
        msleep(20);

        /* Issue CMD0. Goto idle state */
        host->ios.chip_select = MMC_CS_HIGH;
        host->ops->set_ios(host, &host->ios);
        msleep(20);
        err = rsi_issue_sdiocommand(pfunction,
                                    MMC_GO_IDLE_STATE,
                                    0,
                                    (MMC_RSP_NONE | MMC_CMD_BC),
                                    NULL);
        host->ios.chip_select = MMC_CS_DONTCARE;
        host->ops->set_ios(host, &host->ios);
        msleep(20);
        host->use_spi_crc = 0;

        if (err)
                rsi_dbg(ERR_ZONE, "%s: CMD0 failed : %d\n", __func__, err);

        if (!host->ocr_avail) {
                /* Issue CMD5, arg = 0 */
                err = rsi_issue_sdiocommand(pfunction,
                                            SD_IO_SEND_OP_COND,
                                            0,
                                            (MMC_RSP_R4 | MMC_CMD_BCR),
                                            &resp);
                if (err)
                        rsi_dbg(ERR_ZONE, "%s: CMD5 failed : %d\n",
                                __func__, err);
                host->ocr_avail = resp;
        }

        /* Issue CMD5, arg = ocr. Wait till card is ready  */
        for (i = 0; i < 100; i++) {
                err = rsi_issue_sdiocommand(pfunction,
                                            SD_IO_SEND_OP_COND,
                                            host->ocr_avail,
                                            (MMC_RSP_R4 | MMC_CMD_BCR),
                                            &resp);
                if (err) {
                        rsi_dbg(ERR_ZONE, "%s: CMD5 failed : %d\n",
                                __func__, err);
                        break;
                }

                if (resp & MMC_CARD_BUSY)
                        break;
                msleep(20);
        }

        if ((i == 100) || (err)) {
                rsi_dbg(ERR_ZONE, "%s: card in not ready : %d %d\n",
                        __func__, i, err);
                return;
        }

        /* Issue CMD3, get RCA */
        err = rsi_issue_sdiocommand(pfunction,
                                    SD_SEND_RELATIVE_ADDR,
                                    0,
                                    (MMC_RSP_R6 | MMC_CMD_BCR),
                                    &resp);
        if (err) {
                rsi_dbg(ERR_ZONE, "%s: CMD3 failed : %d\n", __func__, err);
                return;
        }
        rca = resp >> 16;
        host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
        host->ops->set_ios(host, &host->ios);

        /* Issue CMD7, select card  */
        err = rsi_issue_sdiocommand(pfunction,
                                    MMC_SELECT_CARD,
                                    (rca << 16),
                                    (MMC_RSP_R1 | MMC_CMD_AC),
                                    NULL);
        if (err) {
                rsi_dbg(ERR_ZONE, "%s: CMD7 failed : %d\n", __func__, err);
                return;
        }

        /* Enable high speed */
        if (card->host->caps & MMC_CAP_SD_HIGHSPEED) {
                rsi_dbg(ERR_ZONE, "%s: Set high speed mode\n", __func__);
                err = rsi_cmd52readbyte(card, SDIO_CCCR_SPEED, &cmd52_resp);
                if (err) {
                        rsi_dbg(ERR_ZONE, "%s: CCCR speed reg read failed: %d\n",
                                __func__, err);
                } else {
                        err = rsi_cmd52writebyte(card,
                                                 SDIO_CCCR_SPEED,
                                                 (cmd52_resp | SDIO_SPEED_EHS));
                        if (err) {
                                rsi_dbg(ERR_ZONE,
                                        "%s: CCR speed regwrite failed %d\n",
                                        __func__, err);
                                return;
                        }
                        host->ios.timing = MMC_TIMING_SD_HS;
                        host->ops->set_ios(host, &host->ios);
                }
        }

        /* Set clock */
        if (mmc_card_hs(card))
                clock = 50000000;
        else
                clock = card->cis.max_dtr;

        if (clock > host->f_max)
                clock = host->f_max;

        host->ios.clock = clock;
        host->ops->set_ios(host, &host->ios);

        if (card->host->caps & MMC_CAP_4_BIT_DATA) {
                /* CMD52: Set bus width & disable card detect resistor */
                err = rsi_cmd52writebyte(card,
                                         SDIO_CCCR_IF,
                                         (SDIO_BUS_CD_DISABLE |
                                          SDIO_BUS_WIDTH_4BIT));
                if (err) {
                        rsi_dbg(ERR_ZONE, "%s: Set bus mode failed : %d\n",
                                __func__, err);
                        return;
                }
                host->ios.bus_width = MMC_BUS_WIDTH_4;
                host->ops->set_ios(host, &host->ios);
        }
}

/**
 * rsi_setclock() - This function sets the clock frequency.
 * @adapter: Pointer to the adapter structure.
 * @freq: Clock frequency.
 *
 * Return: None.
 */
static void rsi_setclock(struct rsi_hw *adapter, u32 freq)
{
        struct rsi_91x_sdiodev *dev =
                (struct rsi_91x_sdiodev *)adapter->rsi_dev;
        struct mmc_host *host = dev->pfunction->card->host;
        u32 clock;

        clock = freq * 1000;
        if (clock > host->f_max)
                clock = host->f_max;
        host->ios.clock = clock;
        host->ops->set_ios(host, &host->ios);
}

/**
 * rsi_setblocklength() - This function sets the host block length.
 * @adapter: Pointer to the adapter structure.
 * @length: Block length to be set.
 *
 * Return: status: 0 on success, -1 on failure.
 */
static int rsi_setblocklength(struct rsi_hw *adapter, u32 length)
{
        struct rsi_91x_sdiodev *dev =
                (struct rsi_91x_sdiodev *)adapter->rsi_dev;
        int status;
        rsi_dbg(INIT_ZONE, "%s: Setting the block length\n", __func__);

        status = sdio_set_block_size(dev->pfunction, length);
        dev->pfunction->max_blksize = 256;

        rsi_dbg(INFO_ZONE,
                "%s: Operational blk length is %d\n", __func__, length);
        return status;
}

/**
 * rsi_setupcard() - This function queries and sets the card's features.
 * @adapter: Pointer to the adapter structure.
 *
 * Return: status: 0 on success, -1 on failure.
 */
static int rsi_setupcard(struct rsi_hw *adapter)
{
        struct rsi_91x_sdiodev *dev =
                (struct rsi_91x_sdiodev *)adapter->rsi_dev;
        int status = 0;

        rsi_setclock(adapter, 50000);

        dev->tx_blk_size = 256;
        status = rsi_setblocklength(adapter, dev->tx_blk_size);
        if (status)
                rsi_dbg(ERR_ZONE,
                        "%s: Unable to set block length\n", __func__);
        return status;
}

/**
 * rsi_sdio_read_register() - This function reads one byte of information
 *                            from a register.
 * @adapter: Pointer to the adapter structure.
 * @addr: Address of the register.
 * @data: Pointer to the data that stores the data read.
 *
 * Return: 0 on success, -1 on failure.
 */
int rsi_sdio_read_register(struct rsi_hw *adapter,
                           u32 addr,
                           u8 *data)
{
        struct rsi_91x_sdiodev *dev =
                (struct rsi_91x_sdiodev *)adapter->rsi_dev;
        u8 fun_num = 0;
        int status;

        sdio_claim_host(dev->pfunction);

        if (fun_num == 0)
                *data = sdio_f0_readb(dev->pfunction, addr, &status);
        else
                *data = sdio_readb(dev->pfunction, addr, &status);

        sdio_release_host(dev->pfunction);

        return status;
}

/**
 * rsi_sdio_write_register() - This function writes one byte of information
 *                             into a register.
 * @adapter: Pointer to the adapter structure.
 * @function: Function Number.
 * @addr: Address of the register.
 * @data: Pointer to the data tha has to be written.
 *
 * Return: 0 on success, -1 on failure.
 */
int rsi_sdio_write_register(struct rsi_hw *adapter,
                            u8 function,
                            u32 addr,
                            u8 *data)
{
        struct rsi_91x_sdiodev *dev =
                (struct rsi_91x_sdiodev *)adapter->rsi_dev;
        int status = 0;

        sdio_claim_host(dev->pfunction);

        if (function == 0)
                sdio_f0_writeb(dev->pfunction, *data, addr, &status);
        else
                sdio_writeb(dev->pfunction, *data, addr, &status);

        sdio_release_host(dev->pfunction);

        return status;
}

/**
 * rsi_sdio_ack_intr() - This function acks the interrupt received.
 * @adapter: Pointer to the adapter structure.
 * @int_bit: Interrupt bit to write into register.
 *
 * Return: None.
 */
void rsi_sdio_ack_intr(struct rsi_hw *adapter, u8 int_bit)
{
        int status;
        status = rsi_sdio_write_register(adapter,
                                         1,
                                         (SDIO_FUN1_INTR_CLR_REG |
                                          RSI_SD_REQUEST_MASTER),
                                         &int_bit);
        if (status)
                rsi_dbg(ERR_ZONE, "%s: unable to send ack\n", __func__);
}



/**
 * rsi_sdio_read_register_multiple() - This function read multiple bytes of
 *                                     information from the SD card.
 * @adapter: Pointer to the adapter structure.
 * @addr: Address of the register.
 * @count: Number of multiple bytes to be read.
 * @data: Pointer to the read data.
 *
 * Return: 0 on success, -1 on failure.
 */
static int rsi_sdio_read_register_multiple(struct rsi_hw *adapter,
                                           u32 addr,
                                           u32 count,
                                           u8 *data)
{
        struct rsi_91x_sdiodev *dev =
                (struct rsi_91x_sdiodev *)adapter->rsi_dev;
        u32 status;

        sdio_claim_host(dev->pfunction);

        status =  sdio_readsb(dev->pfunction, data, addr, count);

        sdio_release_host(dev->pfunction);

        if (status != 0)
                rsi_dbg(ERR_ZONE, "%s: Synch Cmd53 read failed\n", __func__);
        return status;
}

/**
 * rsi_sdio_write_register_multiple() - This function writes multiple bytes of
 *                                      information to the SD card.
 * @adapter: Pointer to the adapter structure.
 * @addr: Address of the register.
 * @data: Pointer to the data that has to be written.
 * @count: Number of multiple bytes to be written.
 *
 * Return: 0 on success, -1 on failure.
 */
int rsi_sdio_write_register_multiple(struct rsi_hw *adapter,
                                     u32 addr,
                                     u8 *data,
                                     u32 count)
{
        struct rsi_91x_sdiodev *dev =
                (struct rsi_91x_sdiodev *)adapter->rsi_dev;
        int status;

        if (dev->write_fail > 1) {
                rsi_dbg(ERR_ZONE, "%s: Stopping card writes\n", __func__);
                return 0;
        } else if (dev->write_fail == 1) {
                /**
                 * Assuming it is a CRC failure, we want to allow another
                 *  card write
                 */
                rsi_dbg(ERR_ZONE, "%s: Continue card writes\n", __func__);
                dev->write_fail++;
        }

        sdio_claim_host(dev->pfunction);

        status = sdio_writesb(dev->pfunction, addr, data, count);

        sdio_release_host(dev->pfunction);

        if (status) {
                rsi_dbg(ERR_ZONE, "%s: Synch Cmd53 write failed %d\n",
                        __func__, status);
                dev->write_fail = 2;
        } else {
                memcpy(dev->prev_desc, data, FRAME_DESC_SZ);
        }
        return status;
}

/**
 * rsi_sdio_host_intf_write_pkt() - This function writes the packet to device.
 * @adapter: Pointer to the adapter structure.
 * @pkt: Pointer to the data to be written on to the device.
 * @len: length of the data to be written on to the device.
 *
 * Return: 0 on success, -1 on failure.
 */
static int rsi_sdio_host_intf_write_pkt(struct rsi_hw *adapter,
                                        u8 *pkt,
                                        u32 len)
{
        struct rsi_91x_sdiodev *dev =
                (struct rsi_91x_sdiodev *)adapter->rsi_dev;
        u32 block_size = dev->tx_blk_size;
        u32 num_blocks, address, length;
        u32 queueno;
        int status;

        queueno = ((pkt[1] >> 4) & 0xf);

        num_blocks = len / block_size;

        if (len % block_size)
                num_blocks++;

        address = (num_blocks * block_size | (queueno << 12));
        length  = num_blocks * block_size;

        status = rsi_sdio_write_register_multiple(adapter,
                                                  address,
                                                  (u8 *)pkt,
                                                  length);
        if (status)
                rsi_dbg(ERR_ZONE, "%s: Unable to write onto the card: %d\n",
                        __func__, status);
        rsi_dbg(DATA_TX_ZONE, "%s: Successfully written onto card\n", __func__);
        return status;
}

/**
 * rsi_sdio_host_intf_read_pkt() - This function reads the packet
                                   from the device.
 * @adapter: Pointer to the adapter data structure.
 * @pkt: Pointer to the packet data to be read from the the device.
 * @length: Length of the data to be read from the device.
 *
 * Return: 0 on success, -1 on failure.
 */
int rsi_sdio_host_intf_read_pkt(struct rsi_hw *adapter,
                                u8 *pkt,
                                u32 length)
{
        int status = -EINVAL;

        if (!length) {
                rsi_dbg(ERR_ZONE, "%s: Pkt size is zero\n", __func__);
                return status;
        }

        status = rsi_sdio_read_register_multiple(adapter,
                                                 length,
                                                 length, /*num of bytes*/
                                                 (u8 *)pkt);

        if (status)
                rsi_dbg(ERR_ZONE, "%s: Failed to read frame: %d\n", __func__,
                        status);
        return status;
}

/**
 * rsi_init_sdio_interface() - This function does init specific to SDIO.
 *
 * @adapter: Pointer to the adapter data structure.
 * @pkt: Pointer to the packet data to be read from the the device.
 *
 * Return: 0 on success, -1 on failure.
 */

static int rsi_init_sdio_interface(struct rsi_hw *adapter,
                                   struct sdio_func *pfunction)
{
        struct rsi_91x_sdiodev *rsi_91x_dev;
        int status = -ENOMEM;

        rsi_91x_dev = kzalloc(sizeof(*rsi_91x_dev), GFP_KERNEL);
        if (!rsi_91x_dev)
                return status;

        adapter->rsi_dev = rsi_91x_dev;

        sdio_claim_host(pfunction);

        pfunction->enable_timeout = 100;
        status = sdio_enable_func(pfunction);
        if (status) {
                rsi_dbg(ERR_ZONE, "%s: Failed to enable interface\n", __func__);
                sdio_release_host(pfunction);
                return status;
        }

        rsi_dbg(INIT_ZONE, "%s: Enabled the interface\n", __func__);

        rsi_91x_dev->pfunction = pfunction;
        adapter->device = &pfunction->dev;

        sdio_set_drvdata(pfunction, adapter);

        status = rsi_setupcard(adapter);
        if (status) {
                rsi_dbg(ERR_ZONE, "%s: Failed to setup card\n", __func__);
                goto fail;
        }

        rsi_dbg(INIT_ZONE, "%s: Setup card succesfully\n", __func__);

        status = rsi_init_sdio_slave_regs(adapter);
        if (status) {
                rsi_dbg(ERR_ZONE, "%s: Failed to init slave regs\n", __func__);
                goto fail;
        }
        sdio_release_host(pfunction);

        adapter->host_intf_write_pkt = rsi_sdio_host_intf_write_pkt;
        adapter->host_intf_read_pkt = rsi_sdio_host_intf_read_pkt;
        adapter->determine_event_timeout = rsi_sdio_determine_event_timeout;
        adapter->check_hw_queue_status = rsi_sdio_read_buffer_status_register;

#ifdef CONFIG_RSI_DEBUGFS
        adapter->num_debugfs_entries = MAX_DEBUGFS_ENTRIES;
#endif
        return status;
fail:
        sdio_disable_func(pfunction);
        sdio_release_host(pfunction);
        return status;
}

/**
 * rsi_probe() - This function is called by kernel when the driver provided
 *               Vendor and device IDs are matched. All the initialization
 *               work is done here.
 * @pfunction: Pointer to the sdio_func structure.
 * @id: Pointer to sdio_device_id structure.
 *
 * Return: 0 on success, 1 on failure.
 */
static int rsi_probe(struct sdio_func *pfunction,
                     const struct sdio_device_id *id)
{
        struct rsi_hw *adapter;

        rsi_dbg(INIT_ZONE, "%s: Init function called\n", __func__);

        adapter = rsi_91x_init();
        if (!adapter) {
                rsi_dbg(ERR_ZONE, "%s: Failed to init os intf ops\n",
                        __func__);
                return 1;
        }

        if (rsi_init_sdio_interface(adapter, pfunction)) {
                rsi_dbg(ERR_ZONE, "%s: Failed to init sdio interface\n",
                        __func__);
                goto fail;
        }

        if (rsi_sdio_device_init(adapter->priv)) {
                rsi_dbg(ERR_ZONE, "%s: Failed in device init\n", __func__);
                sdio_claim_host(pfunction);
                sdio_disable_func(pfunction);
                sdio_release_host(pfunction);
                goto fail;
        }

        sdio_claim_host(pfunction);
        if (sdio_claim_irq(pfunction, rsi_handle_interrupt)) {
                rsi_dbg(ERR_ZONE, "%s: Failed to request IRQ\n", __func__);
                sdio_release_host(pfunction);
                goto fail;
        }

        sdio_release_host(pfunction);
        rsi_dbg(INIT_ZONE, "%s: Registered Interrupt handler\n", __func__);

        return 0;
fail:
        rsi_91x_deinit(adapter);
        rsi_dbg(ERR_ZONE, "%s: Failed in probe...Exiting\n", __func__);
        return 1;
}

/**
 * rsi_disconnect() - This function performs the reverse of the probe function.
 * @pfunction: Pointer to the sdio_func structure.
 *
 * Return: void.
 */
static void rsi_disconnect(struct sdio_func *pfunction)
{
        struct rsi_hw *adapter = sdio_get_drvdata(pfunction);
        struct rsi_91x_sdiodev *dev;

        if (!adapter)
                return;

        dev = (struct rsi_91x_sdiodev *)adapter->rsi_dev;

        dev->write_fail = 2;
        rsi_mac80211_detach(adapter);

        sdio_claim_host(pfunction);
        sdio_release_irq(pfunction);
        sdio_disable_func(pfunction);
        rsi_91x_deinit(adapter);
        /* Resetting to take care of the case, where-in driver is re-loaded */
        rsi_reset_card(pfunction);
        sdio_release_host(pfunction);
}

#ifdef CONFIG_PM
static int rsi_suspend(struct device *dev)
{
        /* Not yet implemented */
        return -ENOSYS;
}

static int rsi_resume(struct device *dev)
{
        /* Not yet implemented */
        return -ENOSYS;
}

static const struct dev_pm_ops rsi_pm_ops = {
        .suspend = rsi_suspend,
        .resume = rsi_resume,
};
#endif

static const struct sdio_device_id rsi_dev_table[] =  {
        { SDIO_DEVICE(0x303, 0x100) },
        { SDIO_DEVICE(0x041B, 0x0301) },
        { SDIO_DEVICE(0x041B, 0x0201) },
        { SDIO_DEVICE(0x041B, 0x9330) },
        { /* Blank */},
};

static struct sdio_driver rsi_driver = {
        .name       = "RSI-SDIO WLAN",
        .probe      = rsi_probe,
        .remove     = rsi_disconnect,
        .id_table   = rsi_dev_table,
#ifdef CONFIG_PM
        .drv = {
                .pm = &rsi_pm_ops,
        }
#endif
};

/**
 * rsi_module_init() - This function registers the sdio module.
 * @void: Void.
 *
 * Return: 0 on success.
 */
static int rsi_module_init(void)
{
        int ret;

        ret = sdio_register_driver(&rsi_driver);
        rsi_dbg(INIT_ZONE, "%s: Registering driver\n", __func__);
        return ret;
}

/**
 * rsi_module_exit() - This function unregisters the sdio module.
 * @void: Void.
 *
 * Return: None.
 */
static void rsi_module_exit(void)
{
        sdio_unregister_driver(&rsi_driver);
        rsi_dbg(INFO_ZONE, "%s: Unregistering driver\n", __func__);
}

module_init(rsi_module_init);
module_exit(rsi_module_exit);

MODULE_AUTHOR("Redpine Signals Inc");
MODULE_DESCRIPTION("Common SDIO layer for RSI drivers");
MODULE_SUPPORTED_DEVICE("RSI-91x");
MODULE_DEVICE_TABLE(sdio, rsi_dev_table);
MODULE_FIRMWARE(FIRMWARE_RSI9113);
MODULE_VERSION("0.1");
MODULE_LICENSE("Dual BSD/GPL");