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33 * \brief Driver for the 24xx16 and 24xx256 I2C EEPROMS (interface)
37 * \author Stefano Fedrigo <aleph@develer.com>
38 * \author Bernie Innocenti <bernie@codewiz.org>
45 #include <cfg/compiler.h>
46 #include <kern/kfile.h>
50 * Values for Eeprom types.
52 typedef enum EepromType
61 * On the same I2C bus can live more than one EEPROM
62 * device. Each device can be addressed by one or more
65 typedef uint8_t e2dev_addr_t;
68 * Describe an EEPROM context, used by the driver to
69 * access the single device.
73 KFile fd; ///< File descriptor.
74 EepromType type; ///< EEPROM type
75 e2dev_addr_t addr; ///< Device address.
81 #define KFT_EEPROM MAKE_ID('E', 'E', 'P', 'R')
84 * Convert + ASSERT from generic KFile to Eeprom.
86 INLINE Eeprom * EEPROM_CAST(KFile *fd)
88 ASSERT(fd->_type == KFT_EEPROM);
92 /// Type for EEPROM addresses
93 typedef uint16_t e2addr_t;
96 * Macro for E2Layout offset calculation
98 * \note We can't just use offsetof() here because we could use
99 * non-constant expressions to access array elements.
101 * \note 'type' is the structure type holding eeprom layout
102 * and must be defined in user files.
104 #define e2addr(type, field) ((e2addr_t)&(((type *)0)->field))
107 * Type for EEPROM block size.
109 typedef uint16_t e2blk_size_t;
112 * Type for accessing EEPROM whole size.
114 typedef uint32_t e2_size_t;
117 * Descrive all EEPROM informations
118 * needed by the driver.
120 typedef struct EepromInfo
122 bool has_dev_addr; ///< true if memory is device addressable (its A0, A1, A2 pin are used by memory).
123 e2blk_size_t blk_size; ///< block size
124 e2_size_t e2_size; ///< eeprom size
127 bool eeprom_erase(Eeprom *fd, e2addr_t addr, e2_size_t count);
128 bool eeprom_verify(Eeprom *fd, const void *buf, size_t count);
129 void eeprom_init(Eeprom *fd, EepromType, e2dev_addr_t, bool verify);
131 #endif /* DRV_EEPROM_H */