static int mcp3422_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct iio_dev *iio;
struct mcp3422 *adc;
int err;
u8 config;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return -ENODEV;
iio = iio_device_alloc(sizeof(*adc));
if (!iio)
return -ENOMEM;
adc = iio_priv(iio);
adc->i2c = client;
mutex_init(&adc->lock);
iio->dev.parent = &client->dev;
iio->name = dev_name(&client->dev);
iio->modes = INDIO_DIRECT_MODE;
iio->info = &mcp3422_info;
switch ((unsigned int)(id->driver_data)) {
case 2:
case 3:
iio->channels = mcp3422_channels;
iio->num_channels = ARRAY_SIZE(mcp3422_channels);
break;
case 4:
iio->channels = mcp3424_channels;
iio->num_channels = ARRAY_SIZE(mcp3424_channels);
break;
}
/* meaningful default configuration */
config = (MCP3422_CONT_SAMPLING
| MCP3422_CHANNEL_VALUE(1)
| MCP3422_PGA_VALUE(MCP3422_PGA_1)
| MCP3422_SAMPLE_RATE_VALUE(MCP3422_SRATE_240));
mcp3422_update_config(adc, config);
err = iio_device_register(iio);
if (err < 0)
goto iio_free;
i2c_set_clientdata(client, iio);
return 0;
iio_free:
iio_device_free(iio);
return err;
}
static int mcp3422_read_channel(struct mcp3422 *adc,
struct iio_chan_spec const *channel, int *value)
{
int ret;
u8 config;
u8 req_channel = channel->channel;
if (req_channel != MCP3422_CHANNEL(adc->config)) {
config = adc->config;
config &= ~MCP3422_CHANNEL_MASK;
config |= MCP3422_CHANNEL_VALUE(req_channel);
config &= ~MCP3422_PGA_MASK;
config |= MCP3422_PGA_VALUE(adc->pga[req_channel]);
ret = mcp3422_update_config(adc, config);
if (ret < 0)
return ret;
msleep(mcp3422_read_times[MCP3422_SAMPLE_RATE(adc->config)]);
}
return mcp3422_read(adc, value, &config);
}
static int mcp3422_write_raw(struct iio_dev *iio,
struct iio_chan_spec const *channel, int val1,
int val2, long mask)
{
struct mcp3422 *adc = iio_priv(iio);
u8 temp;
u8 config = adc->config;
u8 req_channel = channel->channel;
u8 sample_rate = MCP3422_SAMPLE_RATE(config);
u8 i;
switch (mask) {
case IIO_CHAN_INFO_SCALE:
if (val1 != 0)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(mcp3422_scales[0]); i++) {
if (val2 == mcp3422_scales[sample_rate][i]) {
adc->pga[req_channel] = i;
config &= ~MCP3422_CHANNEL_MASK;
config |= MCP3422_CHANNEL_VALUE(req_channel);
config &= ~MCP3422_PGA_MASK;
config |= MCP3422_PGA_VALUE(adc->pga[req_channel]);
return mcp3422_update_config(adc, config);
}
}
return -EINVAL;
case IIO_CHAN_INFO_SAMP_FREQ:
switch (val1) {
case 240:
temp = MCP3422_SRATE_240;
break;
case 60:
temp = MCP3422_SRATE_60;
break;
case 15:
temp = MCP3422_SRATE_15;
break;
case 3:
if (adc->id > 4)
return -EINVAL;
temp = MCP3422_SRATE_3;
break;
default:
return -EINVAL;
}
config &= ~MCP3422_CHANNEL_MASK;
config |= MCP3422_CHANNEL_VALUE(req_channel);
config &= ~MCP3422_SRATE_MASK;
config |= MCP3422_SAMPLE_RATE_VALUE(temp);
return mcp3422_update_config(adc, config);
default:
break;
}
return -EINVAL;
}