diff options
| -rw-r--r-- | hw/misc/auxbus.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/hw/misc/auxbus.c b/hw/misc/auxbus.c index 148b070..9cc9cf3 100644 --- a/hw/misc/auxbus.c +++ b/hw/misc/auxbus.c @@ -133,6 +133,26 @@ AUXReply aux_request(AUXBus *bus, AUXCommand cmd, uint32_t address, * Classic I2C transactions.. */ case READ_I2C: + is_write = cmd == READ_I2C ? false : true; + if (i2c_bus_busy(i2c_bus)) { + i2c_end_transfer(i2c_bus); + } + + if (i2c_start_transfer(i2c_bus, address, !is_write)) { + ret = AUX_I2C_NACK; + break; + } + + ret = AUX_I2C_ACK; + while (len > 0) { + if (i2c_send_recv(i2c_bus, data++, is_write) < 0) { + ret = AUX_I2C_NACK; + break; + } + len--; + } + i2c_end_transfer(i2c_bus); + break; case WRITE_I2C: is_write = cmd == READ_I2C ? false : true; if (i2c_bus_busy(i2c_bus)) { @@ -163,6 +183,39 @@ AUXReply aux_request(AUXBus *bus, AUXCommand cmd, uint32_t address, * - We changed the address. */ case WRITE_I2C_MOT: + is_write = cmd == READ_I2C_MOT ? false : true; + ret = AUX_I2C_NACK; + if (!i2c_bus_busy(i2c_bus)) { + /* + * No transactions started.. + */ + if (i2c_start_transfer(i2c_bus, address, !is_write)) { + break; + } + } else if ((address != bus->last_i2c_address) || + (bus->last_transaction != cmd)) { + /* + * Transaction started but we need to restart.. + */ + i2c_end_transfer(i2c_bus); + if (i2c_start_transfer(i2c_bus, address, !is_write)) { + break; + } + } + + bus->last_transaction = cmd; + bus->last_i2c_address = address; + while (len > 0) { + if (i2c_send_recv(i2c_bus, data++, is_write) < 0) { + i2c_end_transfer(i2c_bus); + break; + } + len--; + } + if (len == 0) { + ret = AUX_I2C_ACK; + } + break; case READ_I2C_MOT: is_write = cmd == READ_I2C_MOT ? false : true; ret = AUX_I2C_NACK; |