iio: adc: intel_mrfld_adc: Add Basin Cove ADC driver (a7118662) · Commits · git / linux-net

drivers/iio/adc/Kconfig

+11 −0

Original line number	Diff line number	Diff line
		@@ -432,6 +432,17 @@ config INGENIC_ADC
		This driver can also be built as a module. If so, the module will be
		called ingenic_adc.

		config INTEL_MRFLD_ADC
		tristate "Intel Merrifield Basin Cove ADC driver"
		depends on INTEL_SOC_PMIC_MRFLD
		help
		Say yes here to have support for Basin Cove power management IC (PMIC) ADC
		device. Depending on platform configuration, this general purpose ADC can
		be used for sampling sensors such as thermal resistors.

		To compile this driver as a module, choose M here: the module will be
		called intel_mrfld_adc.

		config IMX7D_ADC
		tristate "Freescale IMX7D ADC driver"
		depends on ARCH_MXC \|\| COMPILE_TEST

drivers/iio/adc/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -42,6 +42,7 @@ obj-$(CONFIG_HX711) += hx711.o
		obj-$(CONFIG_IMX7D_ADC) += imx7d_adc.o
		obj-$(CONFIG_INA2XX_ADC) += ina2xx-adc.o
		obj-$(CONFIG_INGENIC_ADC) += ingenic-adc.o
		obj-$(CONFIG_INTEL_MRFLD_ADC) += intel_mrfld_adc.o
		obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
		obj-$(CONFIG_LPC18XX_ADC) += lpc18xx_adc.o
		obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o

drivers/iio/adc/intel_mrfld_adc.c

0 → 100644

+262 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/*
		* ADC driver for Basin Cove PMIC
		*
		* Copyright (C) 2012 Intel Corporation
		* Author: Bin Yang <bin.yang@intel.com>
		*
		* Rewritten for upstream by:
		* Vincent Pelletier <plr.vincent@gmail.com>
		* Andy Shevchenko <andriy.shevchenko@linux.intel.com>
		*/

		#include <linux/bitops.h>
		#include <linux/completion.h>
		#include <linux/interrupt.h>
		#include <linux/mfd/intel_soc_pmic.h>
		#include <linux/mfd/intel_soc_pmic_mrfld.h>
		#include <linux/module.h>
		#include <linux/mutex.h>
		#include <linux/platform_device.h>
		#include <linux/regmap.h>

		#include <linux/iio/driver.h>
		#include <linux/iio/iio.h>
		#include <linux/iio/machine.h>

		#include <asm/unaligned.h>

		#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 <bin.yang@intel.com>");
		MODULE_AUTHOR("Vincent Pelletier <plr.vincent@gmail.com>");
		MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
		MODULE_DESCRIPTION("ADC driver for Basin Cove PMIC");
		MODULE_LICENSE("GPL v2");