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eeprom-93cx6: Add (read-only) support for 8-bit mode

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Add read-only support for EEPROMs configured in 8-bit mode (ORG pin connected
to GND).
This will be used by wd719x driver.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Ondrej Zary 2014-11-24 23:24:40 +01:00 committed by Christoph Hellwig
parent 68b14b8f94
commit 7ff28aee40
2 changed files with 65 additions and 1 deletions
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62
drivers/misc/eeprom/eeprom_93cx6.c
View file

@ -170,7 +170,7 @@ static void eeprom_93cx6_read_bits(struct eeprom_93cx6 *eeprom,
}
/**
* eeprom_93cx6_read - Read multiple words from eeprom
* eeprom_93cx6_read - Read a word from eeprom
* @eeprom: Pointer to eeprom structure
* @word: Word index from where we should start reading
* @data: target pointer where the information will have to be stored
@ -234,6 +234,66 @@ void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom, const u8 word,
}
EXPORT_SYMBOL_GPL(eeprom_93cx6_multiread);
/**
* eeprom_93cx6_readb - Read a byte from eeprom
* @eeprom: Pointer to eeprom structure
* @word: Byte index from where we should start reading
* @data: target pointer where the information will have to be stored
*
* This function will read a byte of the eeprom data
* into the given data pointer.
*/
void eeprom_93cx6_readb(struct eeprom_93cx6 *eeprom, const u8 byte,
u8 *data)
{
u16 command;
u16 tmp;
/*
* Initialize the eeprom register
*/
eeprom_93cx6_startup(eeprom);
/*
* Select the read opcode and the byte to be read.
*/
command = (PCI_EEPROM_READ_OPCODE << (eeprom->width + 1)) | byte;
eeprom_93cx6_write_bits(eeprom, command,
PCI_EEPROM_WIDTH_OPCODE + eeprom->width + 1);
/*
* Read the requested 8 bits.
*/
eeprom_93cx6_read_bits(eeprom, &tmp, 8);
*data = tmp & 0xff;
/*
* Cleanup eeprom register.
*/
eeprom_93cx6_cleanup(eeprom);
}
EXPORT_SYMBOL_GPL(eeprom_93cx6_readb);
/**
* eeprom_93cx6_multireadb - Read multiple bytes from eeprom
* @eeprom: Pointer to eeprom structure
* @byte: Index from where we should start reading
* @data: target pointer where the information will have to be stored
* @words: Number of bytes that should be read.
*
* This function will read all requested bytes from the eeprom,
* this is done by calling eeprom_93cx6_readb() multiple times.
*/
void eeprom_93cx6_multireadb(struct eeprom_93cx6 *eeprom, const u8 byte,
u8 *data, const u16 bytes)
{
unsigned int i;
for (i = 0; i < bytes; i++)
eeprom_93cx6_readb(eeprom, byte + i, &data[i]);
}
EXPORT_SYMBOL_GPL(eeprom_93cx6_multireadb);
/**
* eeprom_93cx6_wren - set the write enable state
* @eeprom: Pointer to eeprom structure

4
include/linux/eeprom_93cx6.h
View file

@ -75,6 +75,10 @@ extern void eeprom_93cx6_read(struct eeprom_93cx6 *eeprom,
const u8 word, u16 *data);
extern void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom,
const u8 word, __le16 *data, const u16 words);
extern void eeprom_93cx6_readb(struct eeprom_93cx6 *eeprom,
const u8 byte, u8 *data);
extern void eeprom_93cx6_multireadb(struct eeprom_93cx6 *eeprom,
const u8 byte, u8 *data, const u16 bytes);
extern void eeprom_93cx6_wren(struct eeprom_93cx6 *eeprom, bool enable);