diff options
Diffstat (limited to 'src/include/device/i2c.h')
| -rw-r--r-- | src/include/device/i2c.h | 159 |
1 files changed, 0 insertions, 159 deletions
diff --git a/src/include/device/i2c.h b/src/include/device/i2c.h index 9939bc60bf..d6ee15aa5a 100644 --- a/src/include/device/i2c.h +++ b/src/include/device/i2c.h @@ -17,7 +17,6 @@ #define _DEVICE_I2C_H_ #include <stdint.h> -#include <stdlib.h> /** * struct i2c_msg - an I2C transaction segment beginning with START @@ -67,162 +66,4 @@ enum i2c_address_mode { I2C_MODE_10_BIT }; - -int platform_i2c_transfer(unsigned int bus, struct i2c_msg *segments, - int count); - -#define SOFTWARE_I2C_MAX_BUS 10 /* increase as necessary */ - -struct software_i2c_ops { - void (*set_sda)(unsigned int bus, int high); - void (*set_scl)(unsigned int bus, int high); - int (*get_sda)(unsigned int bus); - int (*get_scl)(unsigned int bus); -}; - -extern struct software_i2c_ops *software_i2c[]; - -int software_i2c_transfer(unsigned int bus, struct i2c_msg *segments, - int count); -void software_i2c_wedge_ack(unsigned int bus, u8 slave); -void software_i2c_wedge_read(unsigned int bus, u8 slave, u8 reg, int bit_count); -void software_i2c_wedge_write(unsigned int bus, u8 slave, u8 reg, - int bit_count); - -int i2c_read_field(unsigned int bus, uint8_t slave, uint8_t reg, uint8_t *data, - uint8_t mask, uint8_t shift); -int i2c_write_field(unsigned int bus, uint8_t slave, uint8_t reg, uint8_t data, - uint8_t mask, uint8_t shift); - -/* - * 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 int bus, struct i2c_msg *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. - * - * [start][slave addr][r][data][stop] - */ -static inline int i2c_read_raw(unsigned int bus, uint8_t slave, uint8_t *data, - int len) -{ - struct i2c_msg seg = { - .flags = I2C_M_RD, .slave = slave, .buf = data, .len = len - }; - - return i2c_transfer(bus, &seg, 1); -} - -/* - * Write a raw chunk of data in one segment and one frame. - * - * [start][slave addr][w][data][stop] - */ -static inline int i2c_write_raw(unsigned int bus, uint8_t slave, uint8_t *data, - int len) -{ - struct i2c_msg seg = { - .flags = 0, .slave = slave, .buf = data, .len = len - }; - - return i2c_transfer(bus, &seg, 1); -} - -/** - * Read multi-bytes with two segments in one frame - * - * [start][slave addr][w][register addr][start][slave addr][r][data...][stop] - */ -static inline int i2c_read_bytes(unsigned int bus, uint8_t slave, uint8_t reg, - uint8_t *data, int len) -{ - struct i2c_msg seg[2]; - - seg[0].flags = 0; - seg[0].slave = slave; - seg[0].buf = ® - seg[0].len = 1; - seg[1].flags = I2C_M_RD; - seg[1].slave = slave; - seg[1].buf = data; - seg[1].len = len; - - return i2c_transfer(bus, seg, ARRAY_SIZE(seg)); -} - -/** - * Read a byte with two segments in one frame - * - * [start][slave addr][w][register addr][start][slave addr][r][data][stop] - */ -static inline int i2c_readb(unsigned int bus, uint8_t slave, uint8_t reg, - uint8_t *data) -{ - struct i2c_msg seg[2]; - - seg[0].flags = 0; - seg[0].slave = slave; - seg[0].buf = ® - seg[0].len = 1; - seg[1].flags = I2C_M_RD; - seg[1].slave = slave; - seg[1].buf = data; - seg[1].len = 1; - - return i2c_transfer(bus, seg, ARRAY_SIZE(seg)); -} - -/** - * Write a byte with one segment in one frame. - * - * [start][slave addr][w][register addr][data][stop] - */ -static inline int i2c_writeb(unsigned int bus, uint8_t slave, uint8_t reg, - uint8_t data) -{ - struct i2c_msg seg; - uint8_t buf[] = {reg, data}; - - seg.flags = 0; - seg.slave = slave; - seg.buf = buf; - seg.len = ARRAY_SIZE(buf); - - return i2c_transfer(bus, &seg, 1); -} - -/* I2C bus operation for ramstage drivers */ -struct device; -struct i2c_bus_operations { - /* - * This is an SOC specific method that can be provided to translate the - * 'struct device' for an I2C controller into a unique I2C bus number. - * Returns -1 if the bus number for this device cannot be determined. - */ - int (*dev_to_bus)(struct device *dev); -}; - -/* Return I2C bus number for provided device, -1 if not found */ -int i2c_dev_find_bus(struct device *dev); - -/* Variants of I2C helper functions that take a device instead of bus number */ -int i2c_dev_transfer(struct device *dev, struct i2c_msg *segments, int count); -int i2c_dev_readb(struct device *dev, uint8_t reg, uint8_t *data); -int i2c_dev_writeb(struct device *dev, uint8_t reg, uint8_t data); -int i2c_dev_read_bytes(struct device *dev, uint8_t reg, uint8_t *data, int len); -int i2c_dev_read_raw(struct device *dev, uint8_t *data, int len); -int i2c_dev_write_raw(struct device *dev, uint8_t *data, int len); - #endif /* _DEVICE_I2C_H_ */ |