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Release 4.8 drivers/iio/dac/ad5446.c

Directory: drivers/iio/dac
/*
 * AD5446 SPI DAC driver
 *
 * Copyright 2010 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include <linux/spi/spi.h>
#include <linux/i2c.h>
#include <linux/regulator/consumer.h>
#include <linux/err.h>
#include <linux/module.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>


#define MODE_PWRDWN_1k		0x1

#define MODE_PWRDWN_100k	0x2

#define MODE_PWRDWN_TRISTATE	0x3

/**
 * struct ad5446_state - driver instance specific data
 * @spi:                spi_device
 * @chip_info:          chip model specific constants, available modes etc
 * @reg:                supply regulator
 * @vref_mv:            actual reference voltage used
 */


struct ad5446_state {
	
struct device		*dev;
	
const struct ad5446_chip_info	*chip_info;
	
struct regulator		*reg;
	
unsigned short			vref_mv;
	
unsigned			cached_val;
	
unsigned			pwr_down_mode;
	
unsigned			pwr_down;
};

/**
 * struct ad5446_chip_info - chip specific information
 * @channel:            channel spec for the DAC
 * @int_vref_mv:        AD5620/40/60: the internal reference voltage
 * @write:              chip specific helper function to write to the register
 */


struct ad5446_chip_info {
	
struct iio_chan_spec	channel;
	
u16			int_vref_mv;
	
int			(*write)(struct ad5446_state *st, unsigned val);
};


static const char * const ad5446_powerdown_modes[] = {
	"1kohm_to_gnd", "100kohm_to_gnd", "three_state"
};




static int ad5446_set_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, unsigned int mode)
{
	struct ad5446_state *st = iio_priv(indio_dev);

	st->pwr_down_mode = mode + 1;

	return 0;
}


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static int ad5446_get_powerdown_mode(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan)
{
	struct ad5446_state *st = iio_priv(indio_dev);

	return st->pwr_down_mode - 1;
}


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static const struct iio_enum ad5446_powerdown_mode_enum = {
	.items = ad5446_powerdown_modes,
	.num_items = ARRAY_SIZE(ad5446_powerdown_modes),
	.get = ad5446_get_powerdown_mode,
	.set = ad5446_set_powerdown_mode,
};




static ssize_t ad5446_read_dac_powerdown(struct iio_dev *indio_dev,
					   uintptr_t private,
					   const struct iio_chan_spec *chan,
					   char *buf)
{
	struct ad5446_state *st = iio_priv(indio_dev);

	return sprintf(buf, "%d\n", st->pwr_down);
}


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static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev,
					    uintptr_t private,
					    const struct iio_chan_spec *chan,
					    const char *buf, size_t len)
{
	struct ad5446_state *st = iio_priv(indio_dev);
	unsigned int shift;
	unsigned int val;
	bool powerdown;
	int ret;

	ret = strtobool(buf, &powerdown);
	if (ret)
		return ret;

	mutex_lock(&indio_dev->mlock);
	st->pwr_down = powerdown;

	if (st->pwr_down) {
		shift = chan->scan_type.realbits + chan->scan_type.shift;
		val = st->pwr_down_mode << shift;
	} else {
		val = st->cached_val;
	}

	ret = st->chip_info->write(st, val);
	mutex_unlock(&indio_dev->mlock);

	return ret ? ret : len;
}


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static const struct iio_chan_spec_ext_info ad5446_ext_info_powerdown[] = {
	{
		.name = "powerdown",
		.read = ad5446_read_dac_powerdown,
		.write = ad5446_write_dac_powerdown,
		.shared = IIO_SEPARATE,
        },
	IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5446_powerdown_mode_enum),
	IIO_ENUM_AVAILABLE("powerdown_mode", &ad5446_powerdown_mode_enum),
	{ },
};


#define _AD5446_CHANNEL(bits, storage, _shift, ext) { \
        .type = IIO_VOLTAGE, \
        .indexed = 1, \
        .output = 1, \
        .channel = 0, \
        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
        .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
        .scan_type = { \
                .sign = 'u', \
                .realbits = (bits), \
                .storagebits = (storage), \
                .shift = (_shift), \
                }, \
        .ext_info = (ext), \
}


#define AD5446_CHANNEL(bits, storage, shift) \
	_AD5446_CHANNEL(bits, storage, shift, NULL)


#define AD5446_CHANNEL_POWERDOWN(bits, storage, shift) \
	_AD5446_CHANNEL(bits, storage, shift, ad5446_ext_info_powerdown)




static int ad5446_read_raw(struct iio_dev *indio_dev,
			   struct iio_chan_spec const *chan,
			   int *val,
			   int *val2,
			   long m)
{
	struct ad5446_state *st = iio_priv(indio_dev);

	switch (m) {
	case IIO_CHAN_INFO_RAW:
		*val = st->cached_val;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		*val = st->vref_mv;
		*val2 = chan->scan_type.realbits;
		return IIO_VAL_FRACTIONAL_LOG2;
	}
	return -EINVAL;
}


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static int ad5446_write_raw(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan,
			       int val,
			       int val2,
			       long mask)
{
	struct ad5446_state *st = iio_priv(indio_dev);
	int ret = 0;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		if (val >= (1 << chan->scan_type.realbits) || val < 0)
			return -EINVAL;

		val <<= chan->scan_type.shift;
		mutex_lock(&indio_dev->mlock);
		st->cached_val = val;
		if (!st->pwr_down)
			ret = st->chip_info->write(st, val);
		mutex_unlock(&indio_dev->mlock);
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}


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static const struct iio_info ad5446_info = {
	.read_raw = ad5446_read_raw,
	.write_raw = ad5446_write_raw,
	.driver_module = THIS_MODULE,
};




static int ad5446_probe(struct device *dev, const char *name,
			const struct ad5446_chip_info *chip_info)
{
	struct ad5446_state *st;
	struct iio_dev *indio_dev;
	struct regulator *reg;
	int ret, voltage_uv = 0;

	reg = devm_regulator_get(dev, "vcc");
	if (!IS_ERR(reg)) {
		ret = regulator_enable(reg);
		if (ret)
			return ret;

		ret = regulator_get_voltage(reg);
		if (ret < 0)
			goto error_disable_reg;

		voltage_uv = ret;
	}

	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
	if (indio_dev == NULL) {
		ret = -ENOMEM;
		goto error_disable_reg;
	}
	st = iio_priv(indio_dev);
	st->chip_info = chip_info;

	dev_set_drvdata(dev, indio_dev);
	st->reg = reg;
	st->dev = dev;

	/* Establish that the iio_dev is a child of the device */
	indio_dev->dev.parent = dev;
	indio_dev->name = name;
	indio_dev->info = &ad5446_info;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = &st->chip_info->channel;
	indio_dev->num_channels = 1;

	st->pwr_down_mode = MODE_PWRDWN_1k;

	if (st->chip_info->int_vref_mv)
		st->vref_mv = st->chip_info->int_vref_mv;
	else if (voltage_uv)
		st->vref_mv = voltage_uv / 1000;
	else
		dev_warn(dev, "reference voltage unspecified\n");

	ret = iio_device_register(indio_dev);
	if (ret)
		goto error_disable_reg;

	return 0;

error_disable_reg:
	if (!IS_ERR(reg))
		regulator_disable(reg);
	return ret;
}


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static int ad5446_remove(struct device *dev)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct ad5446_state *st = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);
	if (!IS_ERR(st->reg))
		regulator_disable(st->reg);

	return 0;
}


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#if IS_ENABLED(CONFIG_SPI_MASTER)




static int ad5446_write(struct ad5446_state *st, unsigned val)
{
	struct spi_device *spi = to_spi_device(st->dev);
	__be16 data = cpu_to_be16(val);

	return spi_write(spi, &data, sizeof(data));
}


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static int ad5660_write(struct ad5446_state *st, unsigned val)
{
	struct spi_device *spi = to_spi_device(st->dev);
	uint8_t data[3];

	data[0] = (val >> 16) & 0xFF;
	data[1] = (val >> 8) & 0xFF;
	data[2] = val & 0xFF;

	return spi_write(spi, data, sizeof(data));
}


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/**
 * ad5446_supported_spi_device_ids:
 * The AD5620/40/60 parts are available in different fixed internal reference
 * voltage options. The actual part numbers may look differently
 * (and a bit cryptic), however this style is used to make clear which
 * parts are supported here.
 */

enum ad5446_supported_spi_device_ids {
	
ID_AD5300,
	
ID_AD5310,
	
ID_AD5320,
	
ID_AD5444,
	
ID_AD5446,
	
ID_AD5450,
	
ID_AD5451,
	
ID_AD5541A,
	
ID_AD5512A,
	
ID_AD5553,
	
ID_AD5601,
	
ID_AD5611,
	
ID_AD5621,
	
ID_AD5641,
	
ID_AD5620_2500,
	
ID_AD5620_1250,
	
ID_AD5640_2500,
	
ID_AD5640_1250,
	
ID_AD5660_2500,
	
ID_AD5660_1250,
	
ID_AD5662,
};


static const struct ad5446_chip_info ad5446_spi_chip_info[] = {
	[ID_AD5300] = {
		.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
		.write = ad5446_write,
        },
	[ID_AD5310] = {
		.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
		.write = ad5446_write,
        },
	[ID_AD5320] = {
		.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
		.write = ad5446_write,
        },
	[ID_AD5444] = {
		.channel = AD5446_CHANNEL(12, 16, 2),
		.write = ad5446_write,
        },
	[ID_AD5446] = {
		.channel = AD5446_CHANNEL(14, 16, 0),
		.write = ad5446_write,
        },
	[ID_AD5450] = {
		.channel = AD5446_CHANNEL(8, 16, 6),
		.write = ad5446_write,
        },
	[ID_AD5451] = {
		.channel = AD5446_CHANNEL(10, 16, 4),
		.write = ad5446_write,
        },
	[ID_AD5541A] = {
		.channel = AD5446_CHANNEL(16, 16, 0),
		.write = ad5446_write,
        },
	[ID_AD5512A] = {
		.channel = AD5446_CHANNEL(12, 16, 4),
		.write = ad5446_write,
        },
	[ID_AD5553] = {
		.channel = AD5446_CHANNEL(14, 16, 0),
		.write = ad5446_write,
        },
	[ID_AD5601] = {
		.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 6),
		.write = ad5446_write,
        },
	[ID_AD5611] = {
		.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 4),
		.write = ad5446_write,
        },
	[ID_AD5621] = {
		.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
		.write = ad5446_write,
        },
	[ID_AD5641] = {
		.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
		.write = ad5446_write,
        },
	[ID_AD5620_2500] = {
		.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
		.int_vref_mv = 2500,
		.write = ad5446_write,
        },
	[ID_AD5620_1250] = {
		.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
		.int_vref_mv = 1250,
		.write = ad5446_write,
        },
	[ID_AD5640_2500] = {
		.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
		.int_vref_mv = 2500,
		.write = ad5446_write,
        },
	[ID_AD5640_1250] = {
		.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
		.int_vref_mv = 1250,
		.write = ad5446_write,
        },
	[ID_AD5660_2500] = {
		.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
		.int_vref_mv = 2500,
		.write = ad5660_write,
        },
	[ID_AD5660_1250] = {
		.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
		.int_vref_mv = 1250,
		.write = ad5660_write,
        },
	[ID_AD5662] = {
		.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
		.write = ad5660_write,
        },
};


static const struct spi_device_id ad5446_spi_ids[] = {
	{"ad5300", ID_AD5300},
	{"ad5310", ID_AD5310},
	{"ad5320", ID_AD5320},
	{"ad5444", ID_AD5444},
	{"ad5446", ID_AD5446},
	{"ad5450", ID_AD5450},
	{"ad5451", ID_AD5451},
	{"ad5452", ID_AD5444}, /* ad5452 is compatible to the ad5444 */
	{"ad5453", ID_AD5446}, /* ad5453 is compatible to the ad5446 */
	{"ad5512a", ID_AD5512A},
	{"ad5541a", ID_AD5541A},
	{"ad5542a", ID_AD5541A}, /* ad5541a and ad5542a are compatible */
	{"ad5543", ID_AD5541A}, /* ad5541a and ad5543 are compatible */
	{"ad5553", ID_AD5553},
	{"ad5601", ID_AD5601},
	{"ad5611", ID_AD5611},
	{"ad5621", ID_AD5621},
	{"ad5641", ID_AD5641},
	{"ad5620-2500", ID_AD5620_2500}, /* AD5620/40/60: */
	{"ad5620-1250", ID_AD5620_1250}, /* part numbers may look differently */
	{"ad5640-2500", ID_AD5640_2500},
	{"ad5640-1250", ID_AD5640_1250},
	{"ad5660-2500", ID_AD5660_2500},
	{"ad5660-1250", ID_AD5660_1250},
	{"ad5662", ID_AD5662},
	{}
};
MODULE_DEVICE_TABLE(spi, ad5446_spi_ids);




static int ad5446_spi_probe(struct spi_device *spi)
{
	const struct spi_device_id *id = spi_get_device_id(spi);

	return ad5446_probe(&spi->dev, id->name,
		&ad5446_spi_chip_info[id->driver_data]);
}


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static int ad5446_spi_remove(struct spi_device *spi)
{
	return ad5446_remove(&spi->dev);
}


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static struct spi_driver ad5446_spi_driver = {
	.driver = {
		.name	= "ad5446",
        },
	.probe		= ad5446_spi_probe,
	.remove		= ad5446_spi_remove,
	.id_table	= ad5446_spi_ids,
};




static int __init ad5446_spi_register_driver(void)
{
	return spi_register_driver(&ad5446_spi_driver);
}


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static void ad5446_spi_unregister_driver(void)
{
	spi_unregister_driver(&ad5446_spi_driver);
}


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#else




static inline int ad5446_spi_register_driver(void) { return 0; }

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static inline void ad5446_spi_unregister_driver(void) { }


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#endif

#if IS_ENABLED(CONFIG_I2C)




static int ad5622_write(struct ad5446_state *st, unsigned val)
{
	struct i2c_client *client = to_i2c_client(st->dev);
	__be16 data = cpu_to_be16(val);

	return i2c_master_send(client, (char *)&data, sizeof(data));
}


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/**
 * ad5446_supported_i2c_device_ids:
 * The AD5620/40/60 parts are available in different fixed internal reference
 * voltage options. The actual part numbers may look differently
 * (and a bit cryptic), however this style is used to make clear which
 * parts are supported here.
 */

enum ad5446_supported_i2c_device_ids {
	
ID_AD5602,
	
ID_AD5612,
	
ID_AD5622,
};


static const struct ad5446_chip_info ad5446_i2c_chip_info[] = {
	[ID_AD5602] = {
		.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
		.write = ad5622_write,
        },
	[ID_AD5612] = {
		.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
		.write = ad5622_write,
        },
	[ID_AD5622] = {
		.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
		.write = ad5622_write,
        },
};




static int ad5446_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	return ad5446_probe(&i2c->dev, id->name,
		&ad5446_i2c_chip_info[id->driver_data]);
}


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static int ad5446_i2c_remove(struct i2c_client *i2c)
{
	return ad5446_remove(&i2c->dev);
}


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static const struct i2c_device_id ad5446_i2c_ids[] = {
	{"ad5301", ID_AD5602},
	{"ad5311", ID_AD5612},
	{"ad5321", ID_AD5622},
	{"ad5602", ID_AD5602},
	{"ad5612", ID_AD5612},
	{"ad5622", ID_AD5622},
	{}
};
MODULE_DEVICE_TABLE(i2c, ad5446_i2c_ids);


static struct i2c_driver ad5446_i2c_driver = {
	.driver = {
		   .name = "ad5446",
        },
	.probe = ad5446_i2c_probe,
	.remove = ad5446_i2c_remove,
	.id_table = ad5446_i2c_ids,
};




static int __init ad5446_i2c_register_driver(void)
{
	return i2c_add_driver(&ad5446_i2c_driver);
}


Contributors
PersonTokensPropCommitsCommitProp
jean-francois dagenaisjean-francois dagenais16100.00%1100.00%


Total16100.00%1100.00%






static void __exit ad5446_i2c_unregister_driver(void)
{
	i2c_del_driver(&ad5446_i2c_driver);
}


Contributors
PersonTokensPropCommitsCommitProp
jean-francois dagenaisjean-francois dagenais15100.00%1100.00%


Total15100.00%1100.00%



#else




static inline int ad5446_i2c_register_driver(void) { return 0; }

Contributors
PersonTokensPropCommitsCommitProp
jean-francois dagenaisjean-francois dagenais12100.00%1100.00%


Total12100.00%1100.00%






static inline void ad5446_i2c_unregister_driver(void) { }


Contributors
PersonTokensPropCommitsCommitProp
jean-francois dagenaisjean-francois dagenais8100.00%1100.00%


Total8100.00%1100.00%



#endif




static int __init ad5446_init(void)
{
	int ret;

	ret = ad5446_spi_register_driver();
	if (ret)
		return ret;

	ret = ad5446_i2c_register_driver();
	if (ret) {
		ad5446_spi_unregister_driver();
		return ret;
	}

	return 0;
}

Contributors
PersonTokensPropCommitsCommitProp
jean-francois dagenaisjean-francois dagenais44100.00%1100.00%


Total44100.00%1100.00%




module_init(ad5446_init);




static void __exit ad5446_exit(void)
{
	ad5446_i2c_unregister_driver();
	ad5446_spi_unregister_driver();
}

Contributors
PersonTokensPropCommitsCommitProp
jean-francois dagenaisjean-francois dagenais15100.00%1100.00%


Total15100.00%1100.00%




module_exit(ad5446_exit);

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC");
MODULE_LICENSE("GPL v2");

Overall Contributors
PersonTokensPropCommitsCommitProp
jean-francois dagenaisjean-francois dagenais163263.80%25.88%


michael hennerichmichael hennerich41916.38%823.53%


lars-peter clausenlars-peter clausen40215.72%1338.24%


jonathan cameronjonathan cameron491.92%720.59%


aida mynzhasovaaida mynzhasova311.21%12.94%


axel linaxel lin140.55%12.94%


sachin kamatsachin kamat80.31%12.94%


paul gortmakerpaul gortmaker30.12%12.94%


Total2558100.00%34100.00%

  
Directory: drivers/iio/dac



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