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-rw-r--r--hw/i2c/smbus.c62
-rw-r--r--include/hw/i2c/smbus.h12
2 files changed, 50 insertions, 24 deletions
diff --git a/hw/i2c/smbus.c b/hw/i2c/smbus.c
index 190f08e089..6e27ae8bd2 100644
--- a/hw/i2c/smbus.c
+++ b/hw/i2c/smbus.c
@@ -208,34 +208,44 @@ static int smbus_device_init(I2CSlave *i2c)
}
/* Master device commands. */
-void smbus_quick_command(I2CBus *bus, uint8_t addr, int read)
+int smbus_quick_command(I2CBus *bus, uint8_t addr, int read)
{
- i2c_start_transfer(bus, addr, read);
+ if (i2c_start_transfer(bus, addr, read)) {
+ return -1;
+ }
i2c_end_transfer(bus);
+ return 0;
}
int smbus_receive_byte(I2CBus *bus, uint8_t addr)
{
uint8_t data;
- i2c_start_transfer(bus, addr, 1);
+ if (i2c_start_transfer(bus, addr, 1)) {
+ return -1;
+ }
data = i2c_recv(bus);
i2c_nack(bus);
i2c_end_transfer(bus);
return data;
}
-void smbus_send_byte(I2CBus *bus, uint8_t addr, uint8_t data)
+int smbus_send_byte(I2CBus *bus, uint8_t addr, uint8_t data)
{
- i2c_start_transfer(bus, addr, 0);
+ if (i2c_start_transfer(bus, addr, 0)) {
+ return -1;
+ }
i2c_send(bus, data);
i2c_end_transfer(bus);
+ return 0;
}
int smbus_read_byte(I2CBus *bus, uint8_t addr, uint8_t command)
{
uint8_t data;
- i2c_start_transfer(bus, addr, 0);
+ if (i2c_start_transfer(bus, addr, 0)) {
+ return -1;
+ }
i2c_send(bus, command);
i2c_start_transfer(bus, addr, 1);
data = i2c_recv(bus);
@@ -244,18 +254,23 @@ int smbus_read_byte(I2CBus *bus, uint8_t addr, uint8_t command)
return data;
}
-void smbus_write_byte(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t data)
+int smbus_write_byte(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t data)
{
- i2c_start_transfer(bus, addr, 0);
+ if (i2c_start_transfer(bus, addr, 0)) {
+ return -1;
+ }
i2c_send(bus, command);
i2c_send(bus, data);
i2c_end_transfer(bus);
+ return 0;
}
int smbus_read_word(I2CBus *bus, uint8_t addr, uint8_t command)
{
uint16_t data;
- i2c_start_transfer(bus, addr, 0);
+ if (i2c_start_transfer(bus, addr, 0)) {
+ return -1;
+ }
i2c_send(bus, command);
i2c_start_transfer(bus, addr, 1);
data = i2c_recv(bus);
@@ -265,13 +280,16 @@ int smbus_read_word(I2CBus *bus, uint8_t addr, uint8_t command)
return data;
}
-void smbus_write_word(I2CBus *bus, uint8_t addr, uint8_t command, uint16_t data)
+int smbus_write_word(I2CBus *bus, uint8_t addr, uint8_t command, uint16_t data)
{
- i2c_start_transfer(bus, addr, 0);
+ if (i2c_start_transfer(bus, addr, 0)) {
+ return -1;
+ }
i2c_send(bus, command);
i2c_send(bus, data & 0xff);
i2c_send(bus, data >> 8);
i2c_end_transfer(bus);
+ return 0;
}
int smbus_read_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data)
@@ -279,33 +297,41 @@ int smbus_read_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data)
int len;
int i;
- i2c_start_transfer(bus, addr, 0);
+ if (i2c_start_transfer(bus, addr, 0)) {
+ return -1;
+ }
i2c_send(bus, command);
i2c_start_transfer(bus, addr, 1);
len = i2c_recv(bus);
- if (len > 32)
+ if (len > 32) {
len = 0;
- for (i = 0; i < len; i++)
+ }
+ for (i = 0; i < len; i++) {
data[i] = i2c_recv(bus);
+ }
i2c_nack(bus);
i2c_end_transfer(bus);
return len;
}
-void smbus_write_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data,
- int len)
+int smbus_write_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data,
+ int len)
{
int i;
if (len > 32)
len = 32;
- i2c_start_transfer(bus, addr, 0);
+ if (i2c_start_transfer(bus, addr, 0)) {
+ return -1;
+ }
i2c_send(bus, command);
i2c_send(bus, len);
- for (i = 0; i < len; i++)
+ for (i = 0; i < len; i++) {
i2c_send(bus, data[i]);
+ }
i2c_end_transfer(bus);
+ return 0;
}
static void smbus_device_class_init(ObjectClass *klass, void *data)
diff --git a/include/hw/i2c/smbus.h b/include/hw/i2c/smbus.h
index 285d3b5de3..544bbc1957 100644
--- a/include/hw/i2c/smbus.h
+++ b/include/hw/i2c/smbus.h
@@ -66,16 +66,16 @@ struct SMBusDevice {
};
/* Master device commands. */
-void smbus_quick_command(I2CBus *bus, uint8_t addr, int read);
+int smbus_quick_command(I2CBus *bus, uint8_t addr, int read);
int smbus_receive_byte(I2CBus *bus, uint8_t addr);
-void smbus_send_byte(I2CBus *bus, uint8_t addr, uint8_t data);
+int smbus_send_byte(I2CBus *bus, uint8_t addr, uint8_t data);
int smbus_read_byte(I2CBus *bus, uint8_t addr, uint8_t command);
-void smbus_write_byte(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t data);
+int smbus_write_byte(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t data);
int smbus_read_word(I2CBus *bus, uint8_t addr, uint8_t command);
-void smbus_write_word(I2CBus *bus, uint8_t addr, uint8_t command, uint16_t data);
+int smbus_write_word(I2CBus *bus, uint8_t addr, uint8_t command, uint16_t data);
int smbus_read_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data);
-void smbus_write_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data,
- int len);
+int smbus_write_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data,
+ int len);
void smbus_eeprom_init(I2CBus *smbus, int nb_eeprom,
const uint8_t *eeprom_spd, int size);