From b587b13a4f670ebae79ae6259cf44328455e4e69 Mon Sep 17 00:00:00 2001 From: David Brownell Date: Mon, 12 Feb 2007 00:52:48 -0800 Subject: [PATCH] SPI eeprom driver This is adds a simple SPI EEPROM driver, providing access to the EEPROM through sysfs much like the I2C "eeprom" driver ... except this driver supports write access, and multiple EEPROM sizes. From: "Tuppa, Walter" Since I have EEPROMs on SPI with different address sizing, I made some changes to your at25.c to support them. Works perfectly. (Also includes a small bugfix for the "what size address" test.) Signed-off-by: David Brownell Signed-off-by: Walter Tuppa Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/spi/eeprom.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 include/linux/spi/eeprom.h (limited to 'include/linux') diff --git a/include/linux/spi/eeprom.h b/include/linux/spi/eeprom.h new file mode 100644 index 0000000..1085212 --- /dev/null +++ b/include/linux/spi/eeprom.h @@ -0,0 +1,22 @@ +#ifndef __LINUX_SPI_EEPROM_H +#define __LINUX_SPI_EEPROM_H + +/* + * Put one of these structures in platform_data for SPI EEPROMS handled + * by the "at25" driver. On SPI, most EEPROMS understand the same core + * command set. If you need to support EEPROMs that don't yet fit, add + * flags to support those protocol options. These values all come from + * the chip datasheets. + */ +struct spi_eeprom { + u32 byte_len; + char name[10]; + u16 page_size; /* for writes */ + u16 flags; +#define EE_ADDR1 0x0001 /* 8 bit addrs */ +#define EE_ADDR2 0x0002 /* 16 bit addrs */ +#define EE_ADDR3 0x0004 /* 24 bit addrs */ +#define EE_READONLY 0x0008 /* disallow writes */ +}; + +#endif /* __LINUX_SPI_EEPROM_H */ -- cgit v1.1