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Release 4.11 drivers/net/wireless/rsi/rsi_91x_sdio.c

/**
 * 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); }

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/** * 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); }

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/** * 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; }

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/** * 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; }

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/** * 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); }

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/** * 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); } }

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/** * 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); }

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/** * 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; }

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/** * 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; }

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/** * 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; }

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/** * 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; }

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/** * 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__); }

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/** * 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; }

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/** * 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; }

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/** * 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; }

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/** * 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; }

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/** * 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; }

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/** * 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; }

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/** * 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); }

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

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

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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; }

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/** * 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__); }

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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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Seungwon Jeon10.03%125.00%
Total2945100.00%4100.00%
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