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Commit 7ff28aee authored by Ondrej Zary's avatar Ondrej Zary Committed by Christoph Hellwig
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eeprom-93cx6: Add (read-only) support for 8-bit mode 



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: default avatarOndrej Zary <linux@rainbow-software.org>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 68b14b8f

drivers/misc/eeprom/eeprom_93cx6.c

+61 −1
Original line number Diff line number Diff line
@@ -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

include/linux/eeprom_93cx6.h

+4 −0
Original line number Diff line number Diff line
@@ -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);