1#ifndef QEMU_SMBUS_H 2#define QEMU_SMBUS_H 3 4/* 5 * QEMU SMBus API 6 * 7 * Copyright (c) 2007 Arastra, Inc. 8 * 9 * Permission is hereby granted, free of charge, to any person obtaining a copy 10 * of this software and associated documentation files (the "Software"), to deal 11 * in the Software without restriction, including without limitation the rights 12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 13 * copies of the Software, and to permit persons to whom the Software is 14 * furnished to do so, subject to the following conditions: 15 * 16 * The above copyright notice and this permission notice shall be included in 17 * all copies or substantial portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 25 * THE SOFTWARE. 26 */ 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 38typedef struct SMBusDeviceClass 39{ 40 I2CSlaveClass parent_class; 41 void (*quick_cmd)(SMBusDevice *dev, uint8_t read); 42 void (*send_byte)(SMBusDevice *dev, uint8_t val); 43 uint8_t (*receive_byte)(SMBusDevice *dev); 44 /* We can't distinguish between a word write and a block write with 45 length 1, so pass the whole data block including the length byte 46 (if present). The device is responsible figuring out what type of 47 command this is. */ 48 void (*write_data)(SMBusDevice *dev, uint8_t cmd, uint8_t *buf, int len); 49 /* Likewise we can't distinguish between different reads, or even know 50 the length of the read until the read is complete, so read data a 51 byte at a time. The device is responsible for adding the length 52 byte on block reads. */ 53 uint8_t (*read_data)(SMBusDevice *dev, uint8_t cmd, int n); 54} SMBusDeviceClass; 55 56struct SMBusDevice { 57 /* The SMBus protocol is implemented on top of I2C. */ 58 I2CSlave i2c; 59 60 /* Remaining fields for internal use only. */ 61 int mode; 62 int data_len; 63 uint8_t data_buf[34]; /* command + len + 32 bytes of data. */ 64 uint8_t command; 65}; 66 67/* Master device commands. */ 68int smbus_quick_command(I2CBus *bus, uint8_t addr, int read); 69int smbus_receive_byte(I2CBus *bus, uint8_t addr); 70int smbus_send_byte(I2CBus *bus, uint8_t addr, uint8_t data); 71int smbus_read_byte(I2CBus *bus, uint8_t addr, uint8_t command); 72int smbus_write_byte(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t data); 73int smbus_read_word(I2CBus *bus, uint8_t addr, uint8_t command); 74int smbus_write_word(I2CBus *bus, uint8_t addr, uint8_t command, uint16_t data); 75 76/* 77 * Do a block transfer from an I2C device. If recv_len is set, then the 78 * first received byte is a length field and is used to know how much data 79 * to receive. Otherwise receive "len" bytes. If send_cmd is set, send 80 * the command byte first before receiving the data. 81 */ 82int smbus_read_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data, 83 int len, bool recv_len, bool send_cmd); 84 85/* 86 * Do a block transfer to an I2C device. If send_len is set, send the 87 * "len" value before the data. 88 */ 89int smbus_write_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data, 90 int len, bool send_len); 91 92void smbus_eeprom_init_one(I2CBus *smbus, uint8_t address, uint8_t *eeprom_buf); 93void smbus_eeprom_init(I2CBus *smbus, int nb_eeprom, 94 const uint8_t *eeprom_spd, int size); 95 96#endif 97