smbus.c and smbus.h had device side code, master side code, and smbus.h has some smbus_eeprom.c definitions. Split them into separate files. Signed-off-by: Corey Minyard <cminyard@mvista.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
166 lines
3.5 KiB
C
166 lines
3.5 KiB
C
/*
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* QEMU SMBus host (master) emulation.
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*
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* This code emulates SMBus transactions from the master point of view,
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* it runs the individual I2C transaction to do the SMBus protocol
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* over I2C.
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*
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* Copyright (c) 2007 CodeSourcery.
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* Written by Paul Brook
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*
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* This code is licensed under the LGPL.
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*/
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#include "qemu/osdep.h"
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#include "hw/hw.h"
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#include "hw/i2c/i2c.h"
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#include "hw/i2c/smbus_master.h"
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/* Master device commands. */
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int smbus_quick_command(I2CBus *bus, uint8_t addr, int read)
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{
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if (i2c_start_transfer(bus, addr, read)) {
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return -1;
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}
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i2c_end_transfer(bus);
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return 0;
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}
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int smbus_receive_byte(I2CBus *bus, uint8_t addr)
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{
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uint8_t data;
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if (i2c_start_transfer(bus, addr, 1)) {
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return -1;
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}
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data = i2c_recv(bus);
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i2c_nack(bus);
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i2c_end_transfer(bus);
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return data;
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}
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int smbus_send_byte(I2CBus *bus, uint8_t addr, uint8_t data)
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{
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if (i2c_start_transfer(bus, addr, 0)) {
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return -1;
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}
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i2c_send(bus, data);
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i2c_end_transfer(bus);
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return 0;
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}
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int smbus_read_byte(I2CBus *bus, uint8_t addr, uint8_t command)
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{
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uint8_t data;
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if (i2c_start_transfer(bus, addr, 0)) {
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return -1;
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}
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i2c_send(bus, command);
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if (i2c_start_transfer(bus, addr, 1)) {
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i2c_end_transfer(bus);
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return -1;
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}
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data = i2c_recv(bus);
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i2c_nack(bus);
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i2c_end_transfer(bus);
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return data;
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}
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int smbus_write_byte(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t data)
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{
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if (i2c_start_transfer(bus, addr, 0)) {
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return -1;
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}
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i2c_send(bus, command);
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i2c_send(bus, data);
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i2c_end_transfer(bus);
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return 0;
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}
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int smbus_read_word(I2CBus *bus, uint8_t addr, uint8_t command)
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{
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uint16_t data;
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if (i2c_start_transfer(bus, addr, 0)) {
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return -1;
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}
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i2c_send(bus, command);
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if (i2c_start_transfer(bus, addr, 1)) {
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i2c_end_transfer(bus);
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return -1;
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}
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data = i2c_recv(bus);
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data |= i2c_recv(bus) << 8;
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i2c_nack(bus);
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i2c_end_transfer(bus);
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return data;
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}
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int smbus_write_word(I2CBus *bus, uint8_t addr, uint8_t command, uint16_t data)
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{
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if (i2c_start_transfer(bus, addr, 0)) {
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return -1;
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}
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i2c_send(bus, command);
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i2c_send(bus, data & 0xff);
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i2c_send(bus, data >> 8);
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i2c_end_transfer(bus);
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return 0;
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}
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int smbus_read_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data,
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int len, bool recv_len, bool send_cmd)
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{
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int rlen;
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int i;
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if (send_cmd) {
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if (i2c_start_transfer(bus, addr, 0)) {
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return -1;
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}
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i2c_send(bus, command);
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}
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if (i2c_start_transfer(bus, addr, 1)) {
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if (send_cmd) {
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i2c_end_transfer(bus);
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}
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return -1;
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}
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if (recv_len) {
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rlen = i2c_recv(bus);
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} else {
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rlen = len;
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}
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if (rlen > len) {
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rlen = 0;
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}
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for (i = 0; i < rlen; i++) {
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data[i] = i2c_recv(bus);
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}
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i2c_nack(bus);
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i2c_end_transfer(bus);
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return rlen;
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}
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int smbus_write_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data,
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int len, bool send_len)
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{
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int i;
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if (len > 32) {
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len = 32;
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}
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if (i2c_start_transfer(bus, addr, 0)) {
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return -1;
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}
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i2c_send(bus, command);
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if (send_len) {
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i2c_send(bus, len);
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}
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for (i = 0; i < len; i++) {
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i2c_send(bus, data[i]);
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}
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i2c_end_transfer(bus);
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return 0;
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}
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