static int smbus_i2c_event(I2CSlave *s, enum i2c_event event) { SMBusDevice *dev = SMBUS_DEVICE(s); switch (event) { case I2C_START_SEND: switch (dev->mode) { case SMBUS_IDLE: DPRINTF("Incoming data\n"); dev->mode = SMBUS_WRITE_DATA; break; default: BADF("Unexpected send start condition in state %d\n", dev->mode); dev->mode = SMBUS_CONFUSED; break; } break; case I2C_START_RECV: switch (dev->mode) { case SMBUS_IDLE: DPRINTF("Read mode\n"); dev->mode = SMBUS_READ_DATA; break; case SMBUS_WRITE_DATA: if (dev->data_len == 0) { BADF("Read after write with no data\n"); dev->mode = SMBUS_CONFUSED; } else { smbus_do_write(dev); DPRINTF("Read mode\n"); dev->mode = SMBUS_READ_DATA; } break; default: BADF("Unexpected recv start condition in state %d\n", dev->mode); dev->mode = SMBUS_CONFUSED; break; } break; case I2C_FINISH: if (dev->data_len == 0) { if (dev->mode == SMBUS_WRITE_DATA || dev->mode == SMBUS_READ_DATA) { smbus_do_quick_cmd(dev, dev->mode == SMBUS_READ_DATA); } } else { switch (dev->mode) { case SMBUS_WRITE_DATA: smbus_do_write(dev); break; case SMBUS_READ_DATA: BADF("Unexpected stop during receive\n"); break; default: /* Nothing to do. */ break; } } dev->mode = SMBUS_IDLE; dev->data_len = 0; break; case I2C_NACK: switch (dev->mode) { case SMBUS_DONE: /* Nothing to do. */ break; case SMBUS_READ_DATA: dev->mode = SMBUS_DONE; break; default: BADF("Unexpected NACK in state %d\n", dev->mode); dev->mode = SMBUS_CONFUSED; break; } } return 0; }
static void smbus_i2c_event(i2c_slave *s, enum i2c_event event) { SMBusDevice *dev = (SMBusDevice *)s; switch (event) { case I2C_START_SEND: switch (dev->mode) { case SMBUS_IDLE: DPRINTF("Incoming data\n"); dev->mode = SMBUS_WRITE_DATA; break; default: BADF("Unexpected send start condition in state %d\n", dev->mode); dev->mode = SMBUS_CONFUSED; break; } break; case I2C_START_RECV: switch (dev->mode) { case SMBUS_IDLE: DPRINTF("Read mode\n"); dev->mode = SMBUS_RECV_BYTE; break; case SMBUS_WRITE_DATA: if (dev->data_len == 0) { BADF("Read after write with no data\n"); dev->mode = SMBUS_CONFUSED; } else { if (dev->data_len > 1) { smbus_do_write(dev); } else { dev->command = dev->data_buf[0]; DPRINTF("%02x: Command %d\n", dev->i2c.address, dev->command); } DPRINTF("Read mode\n"); dev->data_len = 0; dev->mode = SMBUS_READ_DATA; } break; default: BADF("Unexpected recv start condition in state %d\n", dev->mode); dev->mode = SMBUS_CONFUSED; break; } break; case I2C_FINISH: switch (dev->mode) { case SMBUS_WRITE_DATA: smbus_do_write(dev); break; case SMBUS_RECV_BYTE: smbus_do_quick_cmd(dev, 1); break; case SMBUS_READ_DATA: BADF("Unexpected stop during receive\n"); break; default: /* Nothing to do. */ break; } dev->mode = SMBUS_IDLE; dev->data_len = 0; break; case I2C_NACK: switch (dev->mode) { case SMBUS_DONE: /* Nothing to do. */ break; case SMBUS_READ_DATA: dev->mode = SMBUS_DONE; break; default: BADF("Unexpected NACK in state %d\n", dev->mode); dev->mode = SMBUS_CONFUSED; break; } } }