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ANDROID: mmc: Add sdio_readb_ext() function

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Change-Id: I9b410c8a13724795b23764012fd3be8f53747299
This commit is contained in:
Dmitry Shmidt
2008-11-11 11:22:38 -08:00
parent 2b6be3a2b5
commit 56d0106777
2 changed files with 35 additions and 0 deletions
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33
drivers/mmc/core/sdio_io.c
View File

@@ -389,6 +389,39 @@ u8 sdio_readb(struct sdio_func *func, unsigned int addr, int *err_ret)
}
EXPORT_SYMBOL_GPL(sdio_readb);
/**
* sdio_readb_ext - read a single byte from a SDIO function
* @func: SDIO function to access
* @addr: address to read
* @err_ret: optional status value from transfer
* @in: value to add to argument
*
* 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_ext(struct sdio_func *func, unsigned int addr,
int *err_ret, unsigned in)
{
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, (u8)in, &val);
if (ret) {
if (err_ret)
*err_ret = ret;
return 0xFF;
}
return val;
}
EXPORT_SYMBOL_GPL(sdio_readb_ext);
/**
* sdio_writeb - write a single byte to a SDIO function
* @func: SDIO function to access

2
include/linux/mmc/sdio_func.h
View File

@@ -136,6 +136,8 @@ extern int sdio_release_irq(struct sdio_func *func);
extern unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz);
extern u8 sdio_readb(struct sdio_func *func, unsigned int addr, int *err_ret);
extern u8 sdio_readb_ext(struct sdio_func *func, unsigned int addr, int *err_ret,
unsigned in);
extern u16 sdio_readw(struct sdio_func *func, unsigned int addr, int *err_ret);
extern u32 sdio_readl(struct sdio_func *func, unsigned int addr, int *err_ret);