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i2c: add doxygen documentation and make return types use maa_result_t

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Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Brendan Le Foll
2014-04-30 11:35:29 +01:00
parent a83d8ac5df
commit e86916ab91
2 changed files with 48 additions and 42 deletions
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35
src/i2c/i2c.c
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@@ -40,26 +40,28 @@ maa_i2c_init()
return dev;
}
void
maa_result_t
maa_i2c_frequency(maa_i2c_context* dev, int hz)
{
dev->hz = hz;
return MAA_SUCCESS;
}
int
maa_result_t
maa_i2c_receive(maa_i2c_context* dev)
{
return -1;
return MAA_ERROR_FEATURE_NOT_IMPLEMENTED;
}
int
maa_result_t
maa_i2c_read(maa_i2c_context* dev, char *data, int length)
{
// this is the read(3) syscall not maa_i2c_read()
if (read(dev->fh, data, length) == length) {
return length;
}
return -1;
return MAA_ERROR_NO_DATA_AVAILABLE;
}
int
@@ -73,37 +75,40 @@ maa_i2c_read_byte(maa_i2c_context* dev)
return byte;
}
int
maa_result_t
maa_i2c_write(maa_i2c_context* dev, const char* data, int length)
{
if (i2c_smbus_write_i2c_block_data(dev->fh, data[0], length-1, (uint8_t*) data+1) < 0) {
fprintf(stderr, "Failed to write to I2CSlave slave\n");
return -1;
fprintf(stderr, "Failed to write to i2c\n");
return MAA_ERROR_INVALID_HANDLE;
}
return 0;
return MAA_SUCCESS;
}
int
maa_result_t
maa_i2c_write_byte(maa_i2c_context* dev, int data)
{
if (i2c_smbus_write_byte(dev->fh, data) < 0) {
fprintf(stderr, "Failed to write to I2CSlave slave\n");
return -1;
fprintf(stderr, "Failed to write to i2c\n");
return MAA_ERROR_INVALID_HANDLE;
}
return 0;
return MAA_SUCCESS;
}
void
maa_result_t
maa_i2c_address(maa_i2c_context* dev, int addr)
{
dev->addr = addr;
if (ioctl(dev->fh, I2C_SLAVE_FORCE, addr) < 0) {
fprintf(stderr, "Failed to set slave address %d\n", addr);
return MAA_ERROR_INVALID_HANDLE;
}
return MAA_SUCCESS;
}
void
maa_result_t
maa_i2c_stop(maa_i2c_context* dev)
{
free(dev);
return MAA_SUCCESS;
}