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248 lines
5.5 KiB
248 lines
5.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* TI ADC081C/ADC101C/ADC121C 8/10/12-bit ADC driver |
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* |
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* Copyright (C) 2012 Avionic Design GmbH |
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* Copyright (C) 2016 Intel |
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* |
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* Datasheets: |
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* https://www.ti.com/lit/ds/symlink/adc081c021.pdf |
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* https://www.ti.com/lit/ds/symlink/adc101c021.pdf |
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* https://www.ti.com/lit/ds/symlink/adc121c021.pdf |
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* |
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* The devices have a very similar interface and differ mostly in the number of |
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* bits handled. For the 8-bit and 10-bit models the least-significant 4 or 2 |
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* bits of value registers are reserved. |
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*/ |
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#include <linux/err.h> |
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#include <linux/i2c.h> |
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#include <linux/module.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/buffer.h> |
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#include <linux/iio/trigger_consumer.h> |
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#include <linux/iio/triggered_buffer.h> |
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#include <linux/regulator/consumer.h> |
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struct adc081c { |
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struct i2c_client *i2c; |
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struct regulator *ref; |
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/* 8, 10 or 12 */ |
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int bits; |
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/* Ensure natural alignment of buffer elements */ |
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struct { |
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u16 channel; |
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s64 ts __aligned(8); |
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} scan; |
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}; |
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#define REG_CONV_RES 0x00 |
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static int adc081c_read_raw(struct iio_dev *iio, |
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struct iio_chan_spec const *channel, int *value, |
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int *shift, long mask) |
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{ |
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struct adc081c *adc = iio_priv(iio); |
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int err; |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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err = i2c_smbus_read_word_swapped(adc->i2c, REG_CONV_RES); |
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if (err < 0) |
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return err; |
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*value = (err & 0xFFF) >> (12 - adc->bits); |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_SCALE: |
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err = regulator_get_voltage(adc->ref); |
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if (err < 0) |
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return err; |
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*value = err / 1000; |
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*shift = adc->bits; |
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return IIO_VAL_FRACTIONAL_LOG2; |
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default: |
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break; |
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} |
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return -EINVAL; |
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} |
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#define ADCxx1C_CHAN(_bits) { \ |
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.type = IIO_VOLTAGE, \ |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
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.scan_type = { \ |
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.sign = 'u', \ |
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.realbits = (_bits), \ |
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.storagebits = 16, \ |
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.shift = 12 - (_bits), \ |
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.endianness = IIO_CPU, \ |
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}, \ |
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} |
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#define DEFINE_ADCxx1C_CHANNELS(_name, _bits) \ |
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static const struct iio_chan_spec _name ## _channels[] = { \ |
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ADCxx1C_CHAN((_bits)), \ |
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IIO_CHAN_SOFT_TIMESTAMP(1), \ |
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}; \ |
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#define ADC081C_NUM_CHANNELS 2 |
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struct adcxx1c_model { |
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const struct iio_chan_spec* channels; |
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int bits; |
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}; |
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#define ADCxx1C_MODEL(_name, _bits) \ |
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{ \ |
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.channels = _name ## _channels, \ |
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.bits = (_bits), \ |
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} |
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DEFINE_ADCxx1C_CHANNELS(adc081c, 8); |
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DEFINE_ADCxx1C_CHANNELS(adc101c, 10); |
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DEFINE_ADCxx1C_CHANNELS(adc121c, 12); |
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/* Model ids are indexes in _models array */ |
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enum adcxx1c_model_id { |
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ADC081C = 0, |
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ADC101C = 1, |
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ADC121C = 2, |
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}; |
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static struct adcxx1c_model adcxx1c_models[] = { |
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ADCxx1C_MODEL(adc081c, 8), |
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ADCxx1C_MODEL(adc101c, 10), |
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ADCxx1C_MODEL(adc121c, 12), |
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}; |
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static const struct iio_info adc081c_info = { |
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.read_raw = adc081c_read_raw, |
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}; |
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static irqreturn_t adc081c_trigger_handler(int irq, void *p) |
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{ |
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struct iio_poll_func *pf = p; |
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struct iio_dev *indio_dev = pf->indio_dev; |
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struct adc081c *data = iio_priv(indio_dev); |
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int ret; |
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ret = i2c_smbus_read_word_swapped(data->i2c, REG_CONV_RES); |
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if (ret < 0) |
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goto out; |
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data->scan.channel = ret; |
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iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, |
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iio_get_time_ns(indio_dev)); |
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out: |
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iio_trigger_notify_done(indio_dev->trig); |
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return IRQ_HANDLED; |
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} |
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static int adc081c_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct iio_dev *iio; |
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struct adc081c *adc; |
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struct adcxx1c_model *model; |
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int err; |
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) |
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return -EOPNOTSUPP; |
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model = &adcxx1c_models[id->driver_data]; |
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iio = devm_iio_device_alloc(&client->dev, sizeof(*adc)); |
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if (!iio) |
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return -ENOMEM; |
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adc = iio_priv(iio); |
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adc->i2c = client; |
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adc->bits = model->bits; |
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adc->ref = devm_regulator_get(&client->dev, "vref"); |
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if (IS_ERR(adc->ref)) |
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return PTR_ERR(adc->ref); |
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err = regulator_enable(adc->ref); |
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if (err < 0) |
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return err; |
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iio->name = dev_name(&client->dev); |
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iio->modes = INDIO_DIRECT_MODE; |
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iio->info = &adc081c_info; |
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iio->channels = model->channels; |
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iio->num_channels = ADC081C_NUM_CHANNELS; |
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err = iio_triggered_buffer_setup(iio, NULL, adc081c_trigger_handler, NULL); |
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if (err < 0) { |
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dev_err(&client->dev, "iio triggered buffer setup failed\n"); |
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goto err_regulator_disable; |
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} |
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err = iio_device_register(iio); |
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if (err < 0) |
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goto err_buffer_cleanup; |
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i2c_set_clientdata(client, iio); |
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return 0; |
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err_buffer_cleanup: |
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iio_triggered_buffer_cleanup(iio); |
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err_regulator_disable: |
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regulator_disable(adc->ref); |
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return err; |
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} |
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static int adc081c_remove(struct i2c_client *client) |
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{ |
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struct iio_dev *iio = i2c_get_clientdata(client); |
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struct adc081c *adc = iio_priv(iio); |
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iio_device_unregister(iio); |
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iio_triggered_buffer_cleanup(iio); |
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regulator_disable(adc->ref); |
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return 0; |
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} |
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static const struct i2c_device_id adc081c_id[] = { |
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{ "adc081c", ADC081C }, |
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{ "adc101c", ADC101C }, |
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{ "adc121c", ADC121C }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, adc081c_id); |
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static const struct of_device_id adc081c_of_match[] = { |
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{ .compatible = "ti,adc081c" }, |
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{ .compatible = "ti,adc101c" }, |
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{ .compatible = "ti,adc121c" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, adc081c_of_match); |
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static struct i2c_driver adc081c_driver = { |
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.driver = { |
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.name = "adc081c", |
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.of_match_table = adc081c_of_match, |
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}, |
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.probe = adc081c_probe, |
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.remove = adc081c_remove, |
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.id_table = adc081c_id, |
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}; |
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module_i2c_driver(adc081c_driver); |
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MODULE_AUTHOR("Thierry Reding <[email protected]>"); |
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MODULE_DESCRIPTION("Texas Instruments ADC081C/ADC101C/ADC121C driver"); |
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MODULE_LICENSE("GPL v2");
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