1 files changed, 0 insertions, 580 deletions

diff --git a/drivers/staging/iio/adc/ad7291.c b/drivers/staging/iio/adc/ad7291.c
deleted file mode 100644
index 357cef2a6f4c..000000000000
--- a/drivers/staging/iio/adc/ad7291.c
+++ /dev/null
@@ -1,580 +0,0 @@
-/*
- * AD7291 8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor
- *
- * Copyright 2010-2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/interrupt.h>
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/sysfs.h>
-#include <linux/i2c.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/regulator/consumer.h>
-#include <linux/err.h>
-
-#include <linux/iio/iio.h>
-#include <linux/iio/sysfs.h>
-#include <linux/iio/events.h>
-
-#include "ad7291.h"
-
-/*
- * Simplified handling
- *
- * If no events enabled - single polled channel read
- * If event enabled direct reads disable unless channel
- * is in the read mask.
- *
- * The noise-delayed bit as per datasheet suggestion is always enabled.
- *
- */
-
-/*
- * AD7291 registers definition
- */
-#define AD7291_COMMAND			0x00
-#define AD7291_VOLTAGE			0x01
-#define AD7291_T_SENSE			0x02
-#define AD7291_T_AVERAGE		0x03
-#define AD7291_DATA_HIGH(x)		((x) * 3 + 0x4)
-#define AD7291_DATA_LOW(x)		((x) * 3 + 0x5)
-#define AD7291_HYST(x)			((x) * 3 + 0x6)
-#define AD7291_VOLTAGE_ALERT_STATUS	0x1F
-#define AD7291_T_ALERT_STATUS		0x20
-
-#define AD7291_VOLTAGE_LIMIT_COUNT	8
-
-
-/*
- * AD7291 command
- */
-#define AD7291_AUTOCYCLE		(1 << 0)
-#define AD7291_RESET			(1 << 1)
-#define AD7291_ALERT_CLEAR		(1 << 2)
-#define AD7291_ALERT_POLARITY		(1 << 3)
-#define AD7291_EXT_REF			(1 << 4)
-#define AD7291_NOISE_DELAY		(1 << 5)
-#define AD7291_T_SENSE_MASK		(1 << 7)
-#define AD7291_VOLTAGE_MASK		0xFF00
-#define AD7291_VOLTAGE_OFFSET		0x8
-
-/*
- * AD7291 value masks
- */
-#define AD7291_CHANNEL_MASK		0xF000
-#define AD7291_BITS			12
-#define AD7291_VALUE_MASK		0xFFF
-#define AD7291_T_VALUE_SIGN		0x400
-#define AD7291_T_VALUE_FLOAT_OFFSET	2
-#define AD7291_T_VALUE_FLOAT_MASK	0x2
-
-#define AD7291_BITS			12
-
-struct ad7291_chip_info {
-	struct i2c_client	*client;
-	struct regulator	*reg;
-	u16			command;
-	u16			c_mask;	/* Active voltage channels for events */
-	struct mutex		state_lock;
-};
-
-static int ad7291_i2c_read(struct ad7291_chip_info *chip, u8 reg, u16 *data)
-{
-	struct i2c_client *client = chip->client;
-	int ret = 0;
-
-	ret = i2c_smbus_read_word_swapped(client, reg);
-	if (ret < 0) {
-		dev_err(&client->dev, "I2C read error\n");
-		return ret;
-	}
-
-	*data = ret;
-
-	return 0;
-}
-
-static int ad7291_i2c_write(struct ad7291_chip_info *chip, u8 reg, u16 data)
-{
-	return i2c_smbus_write_word_swapped(chip->client, reg, data);
-}
-
-static irqreturn_t ad7291_event_handler(int irq, void *private)
-{
-	struct iio_dev *indio_dev = private;
-	struct ad7291_chip_info *chip = iio_priv(private);
-	u16 t_status, v_status;
-	u16 command;
-	int i;
-	s64 timestamp = iio_get_time_ns();
-
-	if (ad7291_i2c_read(chip, AD7291_T_ALERT_STATUS, &t_status))
-		return IRQ_HANDLED;
-
-	if (ad7291_i2c_read(chip, AD7291_VOLTAGE_ALERT_STATUS, &v_status))
-		return IRQ_HANDLED;
-
-	if (!(t_status || v_status))
-		return IRQ_HANDLED;
-
-	command = chip->command | AD7291_ALERT_CLEAR;
-	ad7291_i2c_write(chip, AD7291_COMMAND, command);
-
-	command = chip->command & ~AD7291_ALERT_CLEAR;
-	ad7291_i2c_write(chip, AD7291_COMMAND, command);
-
-	/* For now treat t_sense and t_sense_average the same */
-	if ((t_status & (1 << 0)) || (t_status & (1 << 2)))
-		iio_push_event(indio_dev,
-			       IIO_UNMOD_EVENT_CODE(IIO_TEMP,
-						    0,
-						    IIO_EV_TYPE_THRESH,
-						    IIO_EV_DIR_FALLING),
-			       timestamp);
-	if ((t_status & (1 << 1)) || (t_status & (1 << 3)))
-		iio_push_event(indio_dev,
-			       IIO_UNMOD_EVENT_CODE(IIO_TEMP,
-						    0,
-						    IIO_EV_TYPE_THRESH,
-						    IIO_EV_DIR_RISING),
-			       timestamp);
-
-	for (i = 0; i < AD7291_VOLTAGE_LIMIT_COUNT*2; i += 2) {
-		if (v_status & (1 << i))
-			iio_push_event(indio_dev,
-				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
-							    i/2,
-							    IIO_EV_TYPE_THRESH,
-							    IIO_EV_DIR_FALLING),
-				       timestamp);
-		if (v_status & (1 << (i + 1)))
-			iio_push_event(indio_dev,
-				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
-							    i/2,
-							    IIO_EV_TYPE_THRESH,
-							    IIO_EV_DIR_RISING),
-				       timestamp);
-	}
-
-	return IRQ_HANDLED;
-}
-
-static unsigned int ad7291_threshold_reg(const struct iio_chan_spec *chan,
-	enum iio_event_direction dir, enum iio_event_info info)
-{
-	unsigned int offset;
-
-	switch (chan->type) {
-	case IIO_VOLTAGE:
-		offset = chan->channel;
-		break;
-	case IIO_TEMP:
-		offset = 8;
-		break;
-	default:
-	    return 0;
-	}
-
-	switch (info) {
-	case IIO_EV_INFO_VALUE:
-			if (dir == IIO_EV_DIR_FALLING)
-					return AD7291_DATA_HIGH(offset);
-			else
-					return AD7291_DATA_LOW(offset);
-	case IIO_EV_INFO_HYSTERESIS:
-			return AD7291_HYST(offset);
-	default:
-			break;
-	}
-	return 0;
-}
-
-static int ad7291_read_event_value(struct iio_dev *indio_dev,
-				   const struct iio_chan_spec *chan,
-				   enum iio_event_type type,
-				   enum iio_event_direction dir,
-				   enum iio_event_info info,
-				   int *val, int *val2)
-{
-	struct ad7291_chip_info *chip = iio_priv(indio_dev);
-	int ret;
-	u16 uval;
-
-	ret = ad7291_i2c_read(chip, ad7291_threshold_reg(chan, dir, info),
-		&uval);
-	if (ret < 0)
-		return ret;
-
-	if (info == IIO_EV_INFO_HYSTERESIS || chan->type == IIO_VOLTAGE)
-		*val = uval & AD7291_VALUE_MASK;
-
-	else
-		*val = sign_extend32(uval, 11);
-
-	return IIO_VAL_INT;
-}
-
-static int ad7291_write_event_value(struct iio_dev *indio_dev,
-				    const struct iio_chan_spec *chan,
-				    enum iio_event_type type,
-				    enum iio_event_direction dir,
-				    enum iio_event_info info,
-				    int val, int val2)
-{
-	struct ad7291_chip_info *chip = iio_priv(indio_dev);
-
-	if (info == IIO_EV_INFO_HYSTERESIS || chan->type == IIO_VOLTAGE) {
-		if (val > AD7291_VALUE_MASK || val < 0)
-			return -EINVAL;
-	} else {
-		if (val > 2047 || val < -2048)
-			return -EINVAL;
-	}
-
-	return ad7291_i2c_write(chip, ad7291_threshold_reg(chan, dir, info),
-		val);
-}
-
-static int ad7291_read_event_config(struct iio_dev *indio_dev,
-				    const struct iio_chan_spec *chan,
-				    enum iio_event_type type,
-				    enum iio_event_direction dir)
-{
-	struct ad7291_chip_info *chip = iio_priv(indio_dev);
-	/* To be enabled the channel must simply be on. If any are enabled
-	   we are in continuous sampling mode */
-
-	switch (chan->type) {
-	case IIO_VOLTAGE:
-		if (chip->c_mask & (1 << (15 - chan->channel)))
-			return 1;
-		else
-			return 0;
-	case IIO_TEMP:
-		/* always on */
-		return 1;
-	default:
-		return -EINVAL;
-	}
-
-}
-
-static int ad7291_write_event_config(struct iio_dev *indio_dev,
-				     const struct iio_chan_spec *chan,
-				     enum iio_event_type type,
-				     enum iio_event_direction dir,
-				     int state)
-{
-	int ret = 0;
-	struct ad7291_chip_info *chip = iio_priv(indio_dev);
-	unsigned int mask;
-	u16 regval;
-
-	mutex_lock(&chip->state_lock);
-	regval = chip->command;
-	/*
-	 * To be enabled the channel must simply be on. If any are enabled
-	 * use continuous sampling mode.
-	 * Possible to disable temp as well but that makes single read tricky.
-	 */
-
-	mask = BIT(15 - chan->channel);
-
-	switch (chan->type) {
-	case IIO_VOLTAGE:
-		if ((!state) && (chip->c_mask & mask))
-			chip->c_mask &= ~mask;
-		else if (state && (!(chip->c_mask & mask)))
-			chip->c_mask |= mask;
-		else
-			break;
-
-		regval &= ~AD7291_AUTOCYCLE;
-		regval |= chip->c_mask;
-		if (chip->c_mask) /* Enable autocycle? */
-			regval |= AD7291_AUTOCYCLE;
-
-		ret = ad7291_i2c_write(chip, AD7291_COMMAND, regval);
-		if (ret < 0)
-			goto error_ret;
-
-		chip->command = regval;
-		break;
-	default:
-		ret = -EINVAL;
-	}
-
-error_ret:
-	mutex_unlock(&chip->state_lock);
-	return ret;
-}
-
-static int ad7291_read_raw(struct iio_dev *indio_dev,
-			   struct iio_chan_spec const *chan,
-			   int *val,
-			   int *val2,
-			   long mask)
-{
-	int ret;
-	struct ad7291_chip_info *chip = iio_priv(indio_dev);
-	u16 regval;
-
-	switch (mask) {
-	case IIO_CHAN_INFO_RAW:
-		switch (chan->type) {
-		case IIO_VOLTAGE:
-			mutex_lock(&chip->state_lock);
-			/* If in autocycle mode drop through */
-			if (chip->command & AD7291_AUTOCYCLE) {
-				mutex_unlock(&chip->state_lock);
-				return -EBUSY;
-			}
-			/* Enable this channel alone */
-			regval = chip->command & (~AD7291_VOLTAGE_MASK);
-			regval |= 1 << (15 - chan->channel);
-			ret = ad7291_i2c_write(chip, AD7291_COMMAND, regval);
-			if (ret < 0) {
-				mutex_unlock(&chip->state_lock);
-				return ret;
-			}
-			/* Read voltage */
-			ret = i2c_smbus_read_word_swapped(chip->client,
-						       AD7291_VOLTAGE);
-			if (ret < 0) {
-				mutex_unlock(&chip->state_lock);
-				return ret;
-			}
-			*val = ret & AD7291_VALUE_MASK;
-			mutex_unlock(&chip->state_lock);
-			return IIO_VAL_INT;
-		case IIO_TEMP:
-			/* Assumes tsense bit of command register always set */
-			ret = i2c_smbus_read_word_swapped(chip->client,
-						       AD7291_T_SENSE);
-			if (ret < 0)
-				return ret;
-			*val = sign_extend32(ret, 11);
-			return IIO_VAL_INT;
-		default:
-			return -EINVAL;
-		}
-	case IIO_CHAN_INFO_AVERAGE_RAW:
-		ret = i2c_smbus_read_word_swapped(chip->client,
-					       AD7291_T_AVERAGE);
-			if (ret < 0)
-				return ret;
-			*val = sign_extend32(ret, 11);
-			return IIO_VAL_INT;
-	case IIO_CHAN_INFO_SCALE:
-		switch (chan->type) {
-		case IIO_VOLTAGE:
-			if (chip->reg) {
-				int vref;
-				vref = regulator_get_voltage(chip->reg);
-				if (vref < 0)
-					return vref;
-				*val = vref / 1000;
-			} else {
-				*val = 2500;
-			}
-			*val2 = AD7291_BITS;
-			return IIO_VAL_FRACTIONAL_LOG2;
-		case IIO_TEMP:
-			/*
-			 * One LSB of the ADC corresponds to 0.25 deg C.
-			 * The temperature reading is in 12-bit twos
-			 * complement format
-			 */
-			*val = 250;
-			return IIO_VAL_INT;
-		default:
-			return -EINVAL;
-		}
-	default:
-		return -EINVAL;
-	}
-}
-
-static const struct iio_event_spec ad7291_events[] = {
-	{
-		.type = IIO_EV_TYPE_THRESH,
-		.dir = IIO_EV_DIR_RISING,
-		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
-			BIT(IIO_EV_INFO_ENABLE),
-	}, {
-		.type = IIO_EV_TYPE_THRESH,
-		.dir = IIO_EV_DIR_FALLING,
-		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
-			BIT(IIO_EV_INFO_ENABLE),
-	}, {
-		.type = IIO_EV_TYPE_THRESH,
-		.dir = IIO_EV_DIR_EITHER,
-		.mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
-	},
-};
-
-#define AD7291_VOLTAGE_CHAN(_chan)					\
-{									\
-	.type = IIO_VOLTAGE,						\
-	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),			\
-	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),		\
-	.indexed = 1,							\
-	.channel = _chan,						\
-	.event_spec = ad7291_events,					\
-	.num_event_specs = ARRAY_SIZE(ad7291_events),			\
-}
-
-static const struct iio_chan_spec ad7291_channels[] = {
-	AD7291_VOLTAGE_CHAN(0),
-	AD7291_VOLTAGE_CHAN(1),
-	AD7291_VOLTAGE_CHAN(2),
-	AD7291_VOLTAGE_CHAN(3),
-	AD7291_VOLTAGE_CHAN(4),
-	AD7291_VOLTAGE_CHAN(5),
-	AD7291_VOLTAGE_CHAN(6),
-	AD7291_VOLTAGE_CHAN(7),
-	{
-		.type = IIO_TEMP,
-		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
-				BIT(IIO_CHAN_INFO_AVERAGE_RAW) |
-				BIT(IIO_CHAN_INFO_SCALE),
-		.indexed = 1,
-		.channel = 0,
-		.event_spec = ad7291_events,
-		.num_event_specs = ARRAY_SIZE(ad7291_events),
-	}
-};
-
-static const struct iio_info ad7291_info = {
-	.read_raw = &ad7291_read_raw,
-	.read_event_config = &ad7291_read_event_config,
-	.write_event_config = &ad7291_write_event_config,
-	.read_event_value = &ad7291_read_event_value,
-	.write_event_value = &ad7291_write_event_value,
-	.driver_module = THIS_MODULE,
-};
-
-static int ad7291_probe(struct i2c_client *client,
-		const struct i2c_device_id *id)
-{
-	struct ad7291_platform_data *pdata = client->dev.platform_data;
-	struct ad7291_chip_info *chip;
-	struct iio_dev *indio_dev;
-	int ret = 0;
-
-	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
-	if (!indio_dev)
-		return -ENOMEM;
-	chip = iio_priv(indio_dev);
-
-	if (pdata && pdata->use_external_ref) {
-		chip->reg = devm_regulator_get(&client->dev, "vref");
-		if (IS_ERR(chip->reg))
-			return ret;
-
-		ret = regulator_enable(chip->reg);
-		if (ret)
-			return ret;
-	}
-
-	mutex_init(&chip->state_lock);
-	/* this is only used for device removal purposes */
-	i2c_set_clientdata(client, indio_dev);
-
-	chip->client = client;
-
-	chip->command = AD7291_NOISE_DELAY |
-			AD7291_T_SENSE_MASK | /* Tsense always enabled */
-			AD7291_ALERT_POLARITY; /* set irq polarity low level */
-
-	if (pdata && pdata->use_external_ref)
-		chip->command |= AD7291_EXT_REF;
-
-	indio_dev->name = id->name;
-	indio_dev->channels = ad7291_channels;
-	indio_dev->num_channels = ARRAY_SIZE(ad7291_channels);
-
-	indio_dev->dev.parent = &client->dev;
-	indio_dev->info = &ad7291_info;
-	indio_dev->modes = INDIO_DIRECT_MODE;
-
-	ret = ad7291_i2c_write(chip, AD7291_COMMAND, AD7291_RESET);
-	if (ret) {
-		ret = -EIO;
-		goto error_disable_reg;
-	}
-
-	ret = ad7291_i2c_write(chip, AD7291_COMMAND, chip->command);
-	if (ret) {
-		ret = -EIO;
-		goto error_disable_reg;
-	}
-
-	if (client->irq > 0) {
-		ret = request_threaded_irq(client->irq,
-					   NULL,
-					   &ad7291_event_handler,
-					   IRQF_TRIGGER_LOW | IRQF_ONESHOT,
-					   id->name,
-					   indio_dev);
-		if (ret)
-			goto error_disable_reg;
-	}
-
-	ret = iio_device_register(indio_dev);
-	if (ret)
-		goto error_unreg_irq;
-
-	return 0;
-
-error_unreg_irq:
-	if (client->irq)
-		free_irq(client->irq, indio_dev);
-error_disable_reg:
-	if (chip->reg)
-		regulator_disable(chip->reg);
-
-	return ret;
-}
-
-static int ad7291_remove(struct i2c_client *client)
-{
-	struct iio_dev *indio_dev = i2c_get_clientdata(client);
-	struct ad7291_chip_info *chip = iio_priv(indio_dev);
-
-	iio_device_unregister(indio_dev);
-
-	if (client->irq)
-		free_irq(client->irq, indio_dev);
-
-	if (chip->reg)
-		regulator_disable(chip->reg);
-
-	return 0;
-}
-
-static const struct i2c_device_id ad7291_id[] = {
-	{ "ad7291", 0 },
-	{}
-};
-
-MODULE_DEVICE_TABLE(i2c, ad7291_id);
-
-static struct i2c_driver ad7291_driver = {
-	.driver = {
-		.name = KBUILD_MODNAME,
-	},
-	.probe = ad7291_probe,
-	.remove = ad7291_remove,
-	.id_table = ad7291_id,
-};
-module_i2c_driver(ad7291_driver);
-
-MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
-MODULE_DESCRIPTION("Analog Devices AD7291 ADC driver");
-MODULE_LICENSE("GPL v2");