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248 lines
5.6 KiB
248 lines
5.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* TI LP8788 MFD - ADC driver |
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* |
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* Copyright 2012 Texas Instruments |
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* |
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* Author: Milo(Woogyom) Kim <[email protected]> |
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*/ |
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#include <linux/delay.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/driver.h> |
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#include <linux/iio/machine.h> |
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#include <linux/mfd/lp8788.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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/* register address */ |
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#define LP8788_ADC_CONF 0x60 |
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#define LP8788_ADC_RAW 0x61 |
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#define LP8788_ADC_DONE 0x63 |
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#define ADC_CONV_START 1 |
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struct lp8788_adc { |
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struct lp8788 *lp; |
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struct iio_map *map; |
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struct mutex lock; |
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}; |
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static const int lp8788_scale[LPADC_MAX] = { |
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[LPADC_VBATT_5P5] = 1343101, |
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[LPADC_VIN_CHG] = 3052503, |
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[LPADC_IBATT] = 610500, |
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[LPADC_IC_TEMP] = 61050, |
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[LPADC_VBATT_6P0] = 1465201, |
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[LPADC_VBATT_5P0] = 1221001, |
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[LPADC_ADC1] = 610500, |
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[LPADC_ADC2] = 610500, |
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[LPADC_VDD] = 1025641, |
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[LPADC_VCOIN] = 757020, |
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[LPADC_ADC3] = 610500, |
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[LPADC_ADC4] = 610500, |
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}; |
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static int lp8788_get_adc_result(struct lp8788_adc *adc, enum lp8788_adc_id id, |
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int *val) |
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{ |
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unsigned int msb; |
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unsigned int lsb; |
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unsigned int result; |
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u8 data; |
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u8 rawdata[2]; |
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int size = ARRAY_SIZE(rawdata); |
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int retry = 5; |
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int ret; |
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data = (id << 1) | ADC_CONV_START; |
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ret = lp8788_write_byte(adc->lp, LP8788_ADC_CONF, data); |
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if (ret) |
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goto err_io; |
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/* retry until adc conversion is done */ |
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data = 0; |
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while (retry--) { |
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usleep_range(100, 200); |
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ret = lp8788_read_byte(adc->lp, LP8788_ADC_DONE, &data); |
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if (ret) |
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goto err_io; |
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/* conversion done */ |
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if (data) |
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break; |
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} |
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ret = lp8788_read_multi_bytes(adc->lp, LP8788_ADC_RAW, rawdata, size); |
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if (ret) |
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goto err_io; |
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msb = (rawdata[0] << 4) & 0x00000ff0; |
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lsb = (rawdata[1] >> 4) & 0x0000000f; |
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result = msb | lsb; |
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*val = result; |
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return 0; |
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err_io: |
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return ret; |
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} |
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static int lp8788_adc_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int *val, int *val2, long mask) |
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{ |
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struct lp8788_adc *adc = iio_priv(indio_dev); |
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enum lp8788_adc_id id = chan->channel; |
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int ret; |
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mutex_lock(&adc->lock); |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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ret = lp8788_get_adc_result(adc, id, val) ? -EIO : IIO_VAL_INT; |
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break; |
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case IIO_CHAN_INFO_SCALE: |
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*val = lp8788_scale[id] / 1000000; |
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*val2 = lp8788_scale[id] % 1000000; |
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ret = IIO_VAL_INT_PLUS_MICRO; |
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break; |
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default: |
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ret = -EINVAL; |
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break; |
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} |
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mutex_unlock(&adc->lock); |
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return ret; |
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} |
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static const struct iio_info lp8788_adc_info = { |
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.read_raw = &lp8788_adc_read_raw, |
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}; |
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#define LP8788_CHAN(_id, _type) { \ |
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.type = _type, \ |
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.indexed = 1, \ |
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.channel = LPADC_##_id, \ |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ |
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BIT(IIO_CHAN_INFO_SCALE), \ |
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.datasheet_name = #_id, \ |
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} |
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static const struct iio_chan_spec lp8788_adc_channels[] = { |
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[LPADC_VBATT_5P5] = LP8788_CHAN(VBATT_5P5, IIO_VOLTAGE), |
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[LPADC_VIN_CHG] = LP8788_CHAN(VIN_CHG, IIO_VOLTAGE), |
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[LPADC_IBATT] = LP8788_CHAN(IBATT, IIO_CURRENT), |
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[LPADC_IC_TEMP] = LP8788_CHAN(IC_TEMP, IIO_TEMP), |
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[LPADC_VBATT_6P0] = LP8788_CHAN(VBATT_6P0, IIO_VOLTAGE), |
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[LPADC_VBATT_5P0] = LP8788_CHAN(VBATT_5P0, IIO_VOLTAGE), |
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[LPADC_ADC1] = LP8788_CHAN(ADC1, IIO_VOLTAGE), |
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[LPADC_ADC2] = LP8788_CHAN(ADC2, IIO_VOLTAGE), |
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[LPADC_VDD] = LP8788_CHAN(VDD, IIO_VOLTAGE), |
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[LPADC_VCOIN] = LP8788_CHAN(VCOIN, IIO_VOLTAGE), |
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[LPADC_ADC3] = LP8788_CHAN(ADC3, IIO_VOLTAGE), |
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[LPADC_ADC4] = LP8788_CHAN(ADC4, IIO_VOLTAGE), |
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}; |
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/* default maps used by iio consumer (lp8788-charger driver) */ |
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static struct iio_map lp8788_default_iio_maps[] = { |
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{ |
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.consumer_dev_name = "lp8788-charger", |
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.consumer_channel = "lp8788_vbatt_5p0", |
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.adc_channel_label = "VBATT_5P0", |
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}, |
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{ |
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.consumer_dev_name = "lp8788-charger", |
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.consumer_channel = "lp8788_adc1", |
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.adc_channel_label = "ADC1", |
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}, |
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{ } |
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}; |
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static int lp8788_iio_map_register(struct iio_dev *indio_dev, |
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struct lp8788_platform_data *pdata, |
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struct lp8788_adc *adc) |
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{ |
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struct iio_map *map; |
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int ret; |
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map = (!pdata || !pdata->adc_pdata) ? |
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lp8788_default_iio_maps : pdata->adc_pdata; |
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ret = iio_map_array_register(indio_dev, map); |
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if (ret) { |
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dev_err(&indio_dev->dev, "iio map err: %d\n", ret); |
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return ret; |
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} |
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adc->map = map; |
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return 0; |
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} |
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static int lp8788_adc_probe(struct platform_device *pdev) |
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{ |
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struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent); |
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struct iio_dev *indio_dev; |
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struct lp8788_adc *adc; |
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int ret; |
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indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc)); |
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if (!indio_dev) |
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return -ENOMEM; |
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adc = iio_priv(indio_dev); |
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adc->lp = lp; |
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platform_set_drvdata(pdev, indio_dev); |
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ret = lp8788_iio_map_register(indio_dev, lp->pdata, adc); |
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if (ret) |
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return ret; |
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mutex_init(&adc->lock); |
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indio_dev->name = pdev->name; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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indio_dev->info = &lp8788_adc_info; |
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indio_dev->channels = lp8788_adc_channels; |
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indio_dev->num_channels = ARRAY_SIZE(lp8788_adc_channels); |
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ret = iio_device_register(indio_dev); |
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if (ret) { |
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dev_err(&pdev->dev, "iio dev register err: %d\n", ret); |
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goto err_iio_device; |
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} |
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return 0; |
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err_iio_device: |
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iio_map_array_unregister(indio_dev); |
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return ret; |
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} |
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static int lp8788_adc_remove(struct platform_device *pdev) |
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{ |
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struct iio_dev *indio_dev = platform_get_drvdata(pdev); |
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iio_device_unregister(indio_dev); |
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iio_map_array_unregister(indio_dev); |
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return 0; |
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} |
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static struct platform_driver lp8788_adc_driver = { |
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.probe = lp8788_adc_probe, |
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.remove = lp8788_adc_remove, |
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.driver = { |
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.name = LP8788_DEV_ADC, |
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}, |
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}; |
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module_platform_driver(lp8788_adc_driver); |
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MODULE_DESCRIPTION("Texas Instruments LP8788 ADC Driver"); |
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MODULE_AUTHOR("Milo Kim"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:lp8788-adc");
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