| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #ifndef _DEVICE_I2C_SIMPLE_H_ |
| #define _DEVICE_I2C_SIMPLE_H_ |
| |
| #include <commonlib/helpers.h> |
| #include <device/i2c.h> |
| |
| 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); |
| } |
| |
| #endif /* _DEVICE_I2C_SIMPLE_H_ */ |