diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/core/Makefile | 3 | ||||
| -rw-r--r-- | drivers/mmc/core/sdio_io.c | 105 |
2 files changed, 107 insertions, 1 deletions
diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile index 71ab3d1e1eb2..bf7a00248039 100644 --- a/drivers/mmc/core/Makefile +++ b/drivers/mmc/core/Makefile @@ -9,5 +9,6 @@ endif obj-$(CONFIG_MMC) += mmc_core.o mmc_core-y := core.o sysfs.o bus.o host.o \ mmc.o mmc_ops.o sd.o sd_ops.o \ - sdio.o sdio_ops.o sdio_bus.o + sdio.o sdio_ops.o sdio_bus.o \ + sdio_io.o diff --git a/drivers/mmc/core/sdio_io.c b/drivers/mmc/core/sdio_io.c new file mode 100644 index 000000000000..4ad06e575634 --- /dev/null +++ b/drivers/mmc/core/sdio_io.c @@ -0,0 +1,105 @@ +/* + * linux/drivers/mmc/core/sdio_io.c + * + * Copyright 2007 Pierre Ossman + * + * 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 of the License, or (at + * your option) any later version. + */ + +#include <linux/mmc/host.h> +#include <linux/mmc/card.h> +#include <linux/mmc/sdio_func.h> + +#include "sdio_ops.h" + +/** + * sdio_claim_host - exclusively claim a bus for a certain SDIO function + * @func: SDIO function that will be accessed + * + * Claim a bus for a set of operations. The SDIO function given + * is used to figure out which bus is relevant. + */ +void sdio_claim_host(struct sdio_func *func) +{ + BUG_ON(!func); + BUG_ON(!func->card); + + mmc_claim_host(func->card->host); +} +EXPORT_SYMBOL_GPL(sdio_claim_host); + +/** + * sdio_release_host - release a bus for a certain SDIO function + * @func: SDIO function that was accessed + * + * Release a bus, allowing others to claim the bus for their + * operations. + */ +void sdio_release_host(struct sdio_func *func) +{ + BUG_ON(!func); + BUG_ON(!func->card); + + mmc_release_host(func->card->host); +} +EXPORT_SYMBOL_GPL(sdio_release_host); + +/** + * sdio_readb - read a single byte from a SDIO function + * @func: SDIO function to access + * @addr: address to read + * @err_ret: optional status value from transfer + * + * Reads a single byte from the address space of a given SDIO + * function. If there is a problem reading the address, 0xff + * is returned and @err_ret will contain the error code. + */ +unsigned char sdio_readb(struct sdio_func *func, unsigned int addr, + int *err_ret) +{ + int ret; + unsigned char val; + + BUG_ON(!func); + + if (err_ret) + *err_ret = 0; + + ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val); + if (ret) { + if (err_ret) + *err_ret = ret; + return 0xFF; + } + + return val; +} +EXPORT_SYMBOL_GPL(sdio_readb); + +/** + * sdio_writeb - write a single byte to a SDIO function + * @func: SDIO function to access + * @b: byte to write + * @addr: address to write to + * @err_ret: optional status value from transfer + * + * Writes a single byte to the address space of a given SDIO + * function. @err_ret will contain the status of the actual + * transfer. + */ +void sdio_writeb(struct sdio_func *func, unsigned char b, unsigned int addr, + int *err_ret) +{ + int ret; + + BUG_ON(!func); + + ret = mmc_io_rw_direct(func->card, 1, func->num, addr, b, NULL); + if (err_ret) + *err_ret = ret; +} +EXPORT_SYMBOL_GPL(sdio_writeb); + |
