2 * Author: Brendan Le Foll <brendan.le.foll@intel.com>
3 * Copyright (c) 2014 Intel Corporation.
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29 * This file defines the i2c interface for libmaa
45 * Opaque pointer definition to the internal struct _i2c
47 typedef struct _i2c* maa_i2c_context;
49 /** Initialise i2c context, using board defintions
51 * @param bus i2c bus to use
52 * @return maa_i2c_context i2c context ready for other calls.
54 maa_i2c_context maa_i2c_init(int bus);
56 /** Initialise i2c context, passing in spi bus to use.
58 * @param bus The i2c bus to use i.e. /dev/i2c-2 would be "2"
59 * @return maa_i2c_context i2c context ready for other calls.
61 maa_i2c_context maa_i2c_init_raw(unsigned int bus);
63 /** Sets the frequency of the i2c context
65 * @param dev the i2c context
66 * @param hz The bus frequency in hertz
68 * @return maa_result_t the maa result.
70 maa_result_t maa_i2c_frequency(maa_i2c_context dev, int hz);
72 /** Read from an i2c context
74 * @param dev the i2c context
75 * @param data pointer to the byte array to read data in to
76 * @param length max number of bytes to read
78 * @return maa_result_t the maa result.
80 maa_result_t maa_i2c_read(maa_i2c_context dev, const char *data, int length);
82 /** Read a single byte from the i2c context
84 * @param dev the i2c context
86 * @return byte the result of the read or -1 if failed.
88 int maa_i2c_read_byte(maa_i2c_context dev);
90 /** Write to an i2c context
92 * @param dev the i2c context
93 * @param data pointer to the byte array to be written
94 * @param length the number of bytes to transmit
96 * @return maa_result_t the maa result.
98 maa_result_t maa_i2c_write(maa_i2c_context dev, char *data, int length);
100 /** Write a single byte to an i2c context
102 * @param dev the i2c context
103 * @data the byte to write
105 * @return maa_result_t the maa result.
107 maa_result_t maa_i2c_write_byte(maa_i2c_context dev, int data);
109 /** Sets the i2c context address.
111 * @param dev the i2c context
112 * @param address The address to set for the slave (ignoring the least
113 * signifcant bit). If set to 0, the slave will only respond to the
114 * general call address.
116 * @return maa_result_t the maa result.
118 maa_result_t maa_i2c_address(maa_i2c_context dev, int address);
120 /** De-inits an maa_i2c_context device
122 * @param dev the i2c context
124 * @return maa_result_t the maa result.
126 maa_result_t maa_i2c_stop(maa_i2c_context dev);