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linux/drivers/net/wireless/rsi/rsi_91x_sdio.c

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/**
* 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");
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