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261 lines
6.4 KiB
261 lines
6.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* ADC driver for Basin Cove PMIC |
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* |
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* Copyright (C) 2012 Intel Corporation |
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* Author: Bin Yang <[email protected]> |
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* |
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* Rewritten for upstream by: |
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* Vincent Pelletier <[email protected]> |
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* Andy Shevchenko <[email protected]> |
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*/ |
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#include <linux/bitops.h> |
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#include <linux/completion.h> |
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#include <linux/interrupt.h> |
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#include <linux/mfd/intel_soc_pmic.h> |
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#include <linux/mfd/intel_soc_pmic_mrfld.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/regmap.h> |
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#include <linux/iio/driver.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/machine.h> |
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#include <asm/unaligned.h> |
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#define BCOVE_GPADCREQ 0xDC |
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#define BCOVE_GPADCREQ_BUSY BIT(0) |
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#define BCOVE_GPADCREQ_IRQEN BIT(1) |
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#define BCOVE_ADCIRQ_ALL ( \ |
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BCOVE_ADCIRQ_BATTEMP | \ |
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BCOVE_ADCIRQ_SYSTEMP | \ |
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BCOVE_ADCIRQ_BATTID | \ |
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BCOVE_ADCIRQ_VIBATT | \ |
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BCOVE_ADCIRQ_CCTICK) |
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#define BCOVE_ADC_TIMEOUT msecs_to_jiffies(1000) |
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static const u8 mrfld_adc_requests[] = { |
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BCOVE_ADCIRQ_VIBATT, |
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BCOVE_ADCIRQ_BATTID, |
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BCOVE_ADCIRQ_VIBATT, |
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BCOVE_ADCIRQ_SYSTEMP, |
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BCOVE_ADCIRQ_BATTEMP, |
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BCOVE_ADCIRQ_BATTEMP, |
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BCOVE_ADCIRQ_SYSTEMP, |
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BCOVE_ADCIRQ_SYSTEMP, |
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BCOVE_ADCIRQ_SYSTEMP, |
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}; |
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struct mrfld_adc { |
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struct regmap *regmap; |
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struct completion completion; |
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/* Lock to protect the IPC transfers */ |
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struct mutex lock; |
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}; |
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static irqreturn_t mrfld_adc_thread_isr(int irq, void *data) |
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{ |
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struct iio_dev *indio_dev = data; |
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struct mrfld_adc *adc = iio_priv(indio_dev); |
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complete(&adc->completion); |
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return IRQ_HANDLED; |
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} |
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static int mrfld_adc_single_conv(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int *result) |
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{ |
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struct mrfld_adc *adc = iio_priv(indio_dev); |
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struct regmap *regmap = adc->regmap; |
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unsigned int req; |
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long timeout; |
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__be16 value; |
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int ret; |
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reinit_completion(&adc->completion); |
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regmap_update_bits(regmap, BCOVE_MADCIRQ, BCOVE_ADCIRQ_ALL, 0); |
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regmap_update_bits(regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_ADC, 0); |
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ret = regmap_read_poll_timeout(regmap, BCOVE_GPADCREQ, req, |
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!(req & BCOVE_GPADCREQ_BUSY), |
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2000, 1000000); |
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if (ret) |
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goto done; |
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req = mrfld_adc_requests[chan->channel]; |
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ret = regmap_write(regmap, BCOVE_GPADCREQ, BCOVE_GPADCREQ_IRQEN | req); |
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if (ret) |
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goto done; |
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timeout = wait_for_completion_interruptible_timeout(&adc->completion, |
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BCOVE_ADC_TIMEOUT); |
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if (timeout < 0) { |
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ret = timeout; |
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goto done; |
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} |
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if (timeout == 0) { |
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ret = -ETIMEDOUT; |
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goto done; |
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} |
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ret = regmap_bulk_read(regmap, chan->address, &value, sizeof(value)); |
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if (ret) |
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goto done; |
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*result = be16_to_cpu(value); |
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ret = IIO_VAL_INT; |
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done: |
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regmap_update_bits(regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_ADC, 0xff); |
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regmap_update_bits(regmap, BCOVE_MADCIRQ, BCOVE_ADCIRQ_ALL, 0xff); |
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return ret; |
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} |
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static int mrfld_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 mrfld_adc *adc = iio_priv(indio_dev); |
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int ret; |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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mutex_lock(&adc->lock); |
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ret = mrfld_adc_single_conv(indio_dev, chan, val); |
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mutex_unlock(&adc->lock); |
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return ret; |
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default: |
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return -EINVAL; |
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} |
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} |
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static const struct iio_info mrfld_adc_iio_info = { |
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.read_raw = &mrfld_adc_read_raw, |
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}; |
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#define BCOVE_ADC_CHANNEL(_type, _channel, _datasheet_name, _address) \ |
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{ \ |
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.indexed = 1, \ |
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.type = _type, \ |
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.channel = _channel, \ |
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.address = _address, \ |
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.datasheet_name = _datasheet_name, \ |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
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} |
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static const struct iio_chan_spec mrfld_adc_channels[] = { |
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BCOVE_ADC_CHANNEL(IIO_VOLTAGE, 0, "CH0", 0xE9), |
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BCOVE_ADC_CHANNEL(IIO_RESISTANCE, 1, "CH1", 0xEB), |
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BCOVE_ADC_CHANNEL(IIO_CURRENT, 2, "CH2", 0xED), |
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BCOVE_ADC_CHANNEL(IIO_TEMP, 3, "CH3", 0xCC), |
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BCOVE_ADC_CHANNEL(IIO_TEMP, 4, "CH4", 0xC8), |
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BCOVE_ADC_CHANNEL(IIO_TEMP, 5, "CH5", 0xCA), |
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BCOVE_ADC_CHANNEL(IIO_TEMP, 6, "CH6", 0xC2), |
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BCOVE_ADC_CHANNEL(IIO_TEMP, 7, "CH7", 0xC4), |
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BCOVE_ADC_CHANNEL(IIO_TEMP, 8, "CH8", 0xC6), |
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}; |
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static struct iio_map iio_maps[] = { |
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IIO_MAP("CH0", "bcove-battery", "VBATRSLT"), |
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IIO_MAP("CH1", "bcove-battery", "BATTID"), |
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IIO_MAP("CH2", "bcove-battery", "IBATRSLT"), |
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IIO_MAP("CH3", "bcove-temp", "PMICTEMP"), |
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IIO_MAP("CH4", "bcove-temp", "BATTEMP0"), |
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IIO_MAP("CH5", "bcove-temp", "BATTEMP1"), |
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IIO_MAP("CH6", "bcove-temp", "SYSTEMP0"), |
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IIO_MAP("CH7", "bcove-temp", "SYSTEMP1"), |
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IIO_MAP("CH8", "bcove-temp", "SYSTEMP2"), |
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{} |
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}; |
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static int mrfld_adc_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent); |
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struct iio_dev *indio_dev; |
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struct mrfld_adc *adc; |
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int irq; |
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int ret; |
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indio_dev = devm_iio_device_alloc(dev, sizeof(struct mrfld_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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mutex_init(&adc->lock); |
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init_completion(&adc->completion); |
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adc->regmap = pmic->regmap; |
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irq = platform_get_irq(pdev, 0); |
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if (irq < 0) |
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return irq; |
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ret = devm_request_threaded_irq(dev, irq, NULL, mrfld_adc_thread_isr, |
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IRQF_ONESHOT | IRQF_SHARED, pdev->name, |
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indio_dev); |
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if (ret) |
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return ret; |
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platform_set_drvdata(pdev, indio_dev); |
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indio_dev->name = pdev->name; |
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indio_dev->channels = mrfld_adc_channels; |
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indio_dev->num_channels = ARRAY_SIZE(mrfld_adc_channels); |
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indio_dev->info = &mrfld_adc_iio_info; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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ret = iio_map_array_register(indio_dev, iio_maps); |
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if (ret) |
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return ret; |
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ret = devm_iio_device_register(dev, indio_dev); |
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if (ret < 0) |
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goto err_array_unregister; |
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return 0; |
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err_array_unregister: |
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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 mrfld_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_map_array_unregister(indio_dev); |
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return 0; |
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} |
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static const struct platform_device_id mrfld_adc_id_table[] = { |
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{ .name = "mrfld_bcove_adc" }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(platform, mrfld_adc_id_table); |
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static struct platform_driver mrfld_adc_driver = { |
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.driver = { |
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.name = "mrfld_bcove_adc", |
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}, |
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.probe = mrfld_adc_probe, |
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.remove = mrfld_adc_remove, |
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.id_table = mrfld_adc_id_table, |
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}; |
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module_platform_driver(mrfld_adc_driver); |
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MODULE_AUTHOR("Bin Yang <[email protected]>"); |
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MODULE_AUTHOR("Vincent Pelletier <[email protected]>"); |
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MODULE_AUTHOR("Andy Shevchenko <[email protected]>"); |
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MODULE_DESCRIPTION("ADC driver for Basin Cove PMIC"); |
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MODULE_LICENSE("GPL v2");
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