diff options
Diffstat (limited to 'src/include/device/i2c.h')
| -rw-r--r-- | src/include/device/i2c.h | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/src/include/device/i2c.h b/src/include/device/i2c.h index da9d1bcb3c..c1f2a2103a 100644 --- a/src/include/device/i2c.h +++ b/src/include/device/i2c.h @@ -31,7 +31,39 @@ struct i2c_seg int len; }; -int i2c_transfer(unsigned bus, struct i2c_seg *segments, int count); +int platform_i2c_transfer(unsigned bus, struct i2c_seg *segments, int count); + +#define SOFTWARE_I2C_MAX_BUS 10 /* increase as necessary */ + +struct software_i2c_ops { + void (*set_sda)(unsigned bus, int high); + void (*set_scl)(unsigned bus, int high); + int (*get_sda)(unsigned bus); + int (*get_scl)(unsigned bus); +}; + +extern struct software_i2c_ops *software_i2c[]; + +int software_i2c_transfer(unsigned bus, struct i2c_seg *segments, int count); +void software_i2c_wedge_ack(unsigned bus, u8 chip); +void software_i2c_wedge_read(unsigned bus, u8 chip, u8 reg, int bit_count); +void software_i2c_wedge_write(unsigned bus, u8 chip, u8 reg, int bit_count); + +/* + * software_i2c is supposed to be a debug feature. It's usually not compiled in, + * but when it is it can be dynamically enabled at runtime for certain busses. + * Need this ugly stub to arbitrate since I2C device drivers hardcode + * 'i2c_transfer()' as their entry point. + */ +static inline int i2c_transfer(unsigned bus, struct i2c_seg *segments, + int count) +{ + if (CONFIG_SOFTWARE_I2C) + if (bus < SOFTWARE_I2C_MAX_BUS && software_i2c[bus]) + return software_i2c_transfer(bus, segments, count); + + return platform_i2c_transfer(bus, segments, count); +} /* * Read a raw chunk of data in one segment and one frame. |