// SPDX-License-Identifier: GPL-2.0 /* * ADC driver for Basin Cove PMIC * * Copyright (C) 2012 Intel Corporation * Author: Bin Yang * * Rewritten for upstream by: * Vincent Pelletier * Andy Shevchenko */ #include #include #include #include #include #include #include #include #include #include #include #include #include #define BCOVE_GPADCREQ 0xDC #define BCOVE_GPADCREQ_BUSY BIT(0) #define BCOVE_GPADCREQ_IRQEN BIT(1) #define BCOVE_ADCIRQ_ALL ( \ BCOVE_ADCIRQ_BATTEMP | \ BCOVE_ADCIRQ_SYSTEMP | \ BCOVE_ADCIRQ_BATTID | \ BCOVE_ADCIRQ_VIBATT | \ BCOVE_ADCIRQ_CCTICK) #define BCOVE_ADC_TIMEOUT msecs_to_jiffies(1000) static const u8 mrfld_adc_requests[] = { BCOVE_ADCIRQ_VIBATT, BCOVE_ADCIRQ_BATTID, BCOVE_ADCIRQ_VIBATT, BCOVE_ADCIRQ_SYSTEMP, BCOVE_ADCIRQ_BATTEMP, BCOVE_ADCIRQ_BATTEMP, BCOVE_ADCIRQ_SYSTEMP, BCOVE_ADCIRQ_SYSTEMP, BCOVE_ADCIRQ_SYSTEMP, }; struct mrfld_adc { struct regmap *regmap; struct completion completion; /* Lock to protect the IPC transfers */ struct mutex lock; }; static irqreturn_t mrfld_adc_thread_isr(int irq, void *data) { struct iio_dev *indio_dev = data; struct mrfld_adc *adc = iio_priv(indio_dev); complete(&adc->completion); return IRQ_HANDLED; } static int mrfld_adc_single_conv(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *result) { struct mrfld_adc *adc = iio_priv(indio_dev); struct regmap *regmap = adc->regmap; unsigned int req; long timeout; u8 buf[2]; int ret; reinit_completion(&adc->completion); regmap_update_bits(regmap, BCOVE_MADCIRQ, BCOVE_ADCIRQ_ALL, 0); regmap_update_bits(regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_ADC, 0); ret = regmap_read_poll_timeout(regmap, BCOVE_GPADCREQ, req, !(req & BCOVE_GPADCREQ_BUSY), 2000, 1000000); if (ret) goto done; req = mrfld_adc_requests[chan->channel]; ret = regmap_write(regmap, BCOVE_GPADCREQ, BCOVE_GPADCREQ_IRQEN | req); if (ret) goto done; timeout = wait_for_completion_interruptible_timeout(&adc->completion, BCOVE_ADC_TIMEOUT); if (timeout < 0) { ret = timeout; goto done; } if (timeout == 0) { ret = -ETIMEDOUT; goto done; } ret = regmap_bulk_read(regmap, chan->address, buf, 2); if (ret) goto done; *result = get_unaligned_be16(buf); ret = IIO_VAL_INT; done: regmap_update_bits(regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_ADC, 0xff); regmap_update_bits(regmap, BCOVE_MADCIRQ, BCOVE_ADCIRQ_ALL, 0xff); return ret; } static int mrfld_adc_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct mrfld_adc *adc = iio_priv(indio_dev); int ret; switch (mask) { case IIO_CHAN_INFO_RAW: mutex_lock(&adc->lock); ret = mrfld_adc_single_conv(indio_dev, chan, val); mutex_unlock(&adc->lock); return ret; default: return -EINVAL; } } static const struct iio_info mrfld_adc_iio_info = { .read_raw = &mrfld_adc_read_raw, }; #define BCOVE_ADC_CHANNEL(_type, _channel, _datasheet_name, _address) \ { \ .indexed = 1, \ .type = _type, \ .channel = _channel, \ .address = _address, \ .datasheet_name = _datasheet_name, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ } static const struct iio_chan_spec mrfld_adc_channels[] = { BCOVE_ADC_CHANNEL(IIO_VOLTAGE, 0, "CH0", 0xE9), BCOVE_ADC_CHANNEL(IIO_RESISTANCE, 1, "CH1", 0xEB), BCOVE_ADC_CHANNEL(IIO_CURRENT, 2, "CH2", 0xED), BCOVE_ADC_CHANNEL(IIO_TEMP, 3, "CH3", 0xCC), BCOVE_ADC_CHANNEL(IIO_TEMP, 4, "CH4", 0xC8), BCOVE_ADC_CHANNEL(IIO_TEMP, 5, "CH5", 0xCA), BCOVE_ADC_CHANNEL(IIO_TEMP, 6, "CH6", 0xC2), BCOVE_ADC_CHANNEL(IIO_TEMP, 7, "CH7", 0xC4), BCOVE_ADC_CHANNEL(IIO_TEMP, 8, "CH8", 0xC6), }; static struct iio_map iio_maps[] = { IIO_MAP("CH0", "bcove-battery", "VBATRSLT"), IIO_MAP("CH1", "bcove-battery", "BATTID"), IIO_MAP("CH2", "bcove-battery", "IBATRSLT"), IIO_MAP("CH3", "bcove-temp", "PMICTEMP"), IIO_MAP("CH4", "bcove-temp", "BATTEMP0"), IIO_MAP("CH5", "bcove-temp", "BATTEMP1"), IIO_MAP("CH6", "bcove-temp", "SYSTEMP0"), IIO_MAP("CH7", "bcove-temp", "SYSTEMP1"), IIO_MAP("CH8", "bcove-temp", "SYSTEMP2"), {} }; static int mrfld_adc_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent); struct iio_dev *indio_dev; struct mrfld_adc *adc; int irq; int ret; indio_dev = devm_iio_device_alloc(dev, sizeof(*indio_dev)); if (!indio_dev) return -ENOMEM; adc = iio_priv(indio_dev); mutex_init(&adc->lock); init_completion(&adc->completion); adc->regmap = pmic->regmap; irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; ret = devm_request_threaded_irq(dev, irq, NULL, mrfld_adc_thread_isr, IRQF_ONESHOT | IRQF_SHARED, pdev->name, indio_dev); if (ret) return ret; platform_set_drvdata(pdev, indio_dev); indio_dev->dev.parent = dev; indio_dev->name = pdev->name; indio_dev->channels = mrfld_adc_channels; indio_dev->num_channels = ARRAY_SIZE(mrfld_adc_channels); indio_dev->info = &mrfld_adc_iio_info; indio_dev->modes = INDIO_DIRECT_MODE; ret = iio_map_array_register(indio_dev, iio_maps); if (ret) return ret; ret = devm_iio_device_register(dev, indio_dev); if (ret < 0) goto err_array_unregister; return 0; err_array_unregister: iio_map_array_unregister(indio_dev); return ret; } static int mrfld_adc_remove(struct platform_device *pdev) { struct iio_dev *indio_dev = platform_get_drvdata(pdev); iio_map_array_unregister(indio_dev); return 0; } static const struct platform_device_id mrfld_adc_id_table[] = { { .name = "mrfld_bcove_adc" }, {} }; MODULE_DEVICE_TABLE(platform, mrfld_adc_id_table); static struct platform_driver mrfld_adc_driver = { .driver = { .name = "mrfld_bcove_adc", }, .probe = mrfld_adc_probe, .remove = mrfld_adc_remove, .id_table = mrfld_adc_id_table, }; module_platform_driver(mrfld_adc_driver); MODULE_AUTHOR("Bin Yang "); MODULE_AUTHOR("Vincent Pelletier "); MODULE_AUTHOR("Andy Shevchenko "); MODULE_DESCRIPTION("ADC driver for Basin Cove PMIC"); MODULE_LICENSE("GPL v2");