1 /* 2 * QEMU SMBus device (slave) API 3 * 4 * Copyright (c) 2007 Arastra, Inc. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #ifndef HW_SMBUS_SLAVE_H 26 #define HW_SMBUS_SLAVE_H 27 28 #include "hw/i2c/i2c.h" 29 30 #define TYPE_SMBUS_DEVICE "smbus-device" 31 #define SMBUS_DEVICE(obj) \ 32 OBJECT_CHECK(SMBusDevice, (obj), TYPE_SMBUS_DEVICE) 33 #define SMBUS_DEVICE_CLASS(klass) \ 34 OBJECT_CLASS_CHECK(SMBusDeviceClass, (klass), TYPE_SMBUS_DEVICE) 35 #define SMBUS_DEVICE_GET_CLASS(obj) \ 36 OBJECT_GET_CLASS(SMBusDeviceClass, (obj), TYPE_SMBUS_DEVICE) 37 38 typedef struct SMBusDevice SMBusDevice; 39 40 typedef struct SMBusDeviceClass 41 { 42 I2CSlaveClass parent_class; 43 void (*quick_cmd)(SMBusDevice *dev, uint8_t read); 44 void (*send_byte)(SMBusDevice *dev, uint8_t val); 45 uint8_t (*receive_byte)(SMBusDevice *dev); 46 /* We can't distinguish between a word write and a block write with 47 length 1, so pass the whole data block including the length byte 48 (if present). The device is responsible figuring out what type of 49 command this is. */ 50 void (*write_data)(SMBusDevice *dev, uint8_t cmd, uint8_t *buf, int len); 51 /* Likewise we can't distinguish between different reads, or even know 52 the length of the read until the read is complete, so read data a 53 byte at a time. The device is responsible for adding the length 54 byte on block reads. */ 55 uint8_t (*read_data)(SMBusDevice *dev, uint8_t cmd, int n); 56 } SMBusDeviceClass; 57 58 struct SMBusDevice { 59 /* The SMBus protocol is implemented on top of I2C. */ 60 I2CSlave i2c; 61 62 /* Remaining fields for internal use only. */ 63 int mode; 64 int data_len; 65 uint8_t data_buf[34]; /* command + len + 32 bytes of data. */ 66 uint8_t command; 67 }; 68 69 #endif 70