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Commit df38a4a7 authored by Sean Nyekjaer's avatar Sean Nyekjaer Committed by Jonathan Cameron
Browse files

iio: dac: add TI DAC5571 family support 



This patch adds support for the Texas Intruments DAC5571 Family.

Signed-off-by: default avatarSean Nyekjaer <sean.nyekjaer@prevas.dk>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent d8b40181

drivers/iio/dac/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -335,6 +335,16 @@ config TI_DAC082S085 


	  If compiled as a module, it will be called ti-dac082s085.



config TI_DAC5571

	tristate "Texas Instruments 8/10/12/16-bit 1/2/4-channel DAC driver"

	depends on I2C

	help

	  Driver for the Texas Instruments

	  DAC5571, DAC6571, DAC7571, DAC5574, DAC6574, DAC7574, DAC5573,

	  DAC6573, DAC7573, DAC8571, DAC8574.



	  If compiled as a module, it will be called ti-dac5571.



config VF610_DAC

	tristate "Vybrid vf610 DAC driver"

	depends on OF

drivers/iio/dac/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -37,4 +37,5 @@ obj-$(CONFIG_MCP4922) += mcp4922.o 
obj-$(CONFIG_STM32_DAC_CORE) += stm32-dac-core.o

obj-$(CONFIG_STM32_DAC) += stm32-dac.o

obj-$(CONFIG_TI_DAC082S085) += ti-dac082s085.o

obj-$(CONFIG_TI_DAC5571) += ti-dac5571.o

obj-$(CONFIG_VF610_DAC) += vf610_dac.o

drivers/iio/dac/ti-dac5571.c

0 → 100644
+439 −0
Original line number Diff line number Diff line 
/*

 * ti-dac5571.c - Texas Instruments 8/10/12-bit 1/4-channel DAC driver

 *

 * Copyright (C) 2018 Prevas A/S

 *

 * http://www.ti.com/lit/ds/symlink/dac5571.pdf

 * http://www.ti.com/lit/ds/symlink/dac6571.pdf

 * http://www.ti.com/lit/ds/symlink/dac7571.pdf

 * http://www.ti.com/lit/ds/symlink/dac5574.pdf

 * http://www.ti.com/lit/ds/symlink/dac6574.pdf

 * http://www.ti.com/lit/ds/symlink/dac7574.pdf

 * http://www.ti.com/lit/ds/symlink/dac5573.pdf

 * http://www.ti.com/lit/ds/symlink/dac6573.pdf

 * http://www.ti.com/lit/ds/symlink/dac7573.pdf

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License (version 2) as

 * published by the Free Software Foundation.

 */



#include <linux/iio/iio.h>

#include <linux/i2c.h>

#include <linux/module.h>

#include <linux/of_device.h>

#include <linux/of.h>

#include <linux/regulator/consumer.h>



enum chip_id {

	single_8bit, single_10bit, single_12bit,

	quad_8bit, quad_10bit, quad_12bit

};



struct dac5571_spec {

	u8 num_channels;

	u8 resolution;

};



static const struct dac5571_spec dac5571_spec[] = {

	[single_8bit]  = {.num_channels = 1, .resolution =  8},

	[single_10bit] = {.num_channels = 1, .resolution = 10},

	[single_12bit] = {.num_channels = 1, .resolution = 12},

	[quad_8bit]    = {.num_channels = 4, .resolution =  8},

	[quad_10bit]   = {.num_channels = 4, .resolution = 10},

	[quad_12bit]   = {.num_channels = 4, .resolution = 12},

};



struct dac5571_data {

	struct i2c_client *client;

	int id;

	struct mutex lock;

	struct regulator *vref;

	u16 val[4];

	bool powerdown;

	u8 powerdown_mode;

	struct dac5571_spec const *spec;

	int (*dac5571_cmd)(struct dac5571_data *data, int channel, u16 val);

	int (*dac5571_pwrdwn)(struct dac5571_data *data, int channel, u8 pwrdwn);

	u8 buf[3] ____cacheline_aligned;

};



#define DAC5571_POWERDOWN(mode)		((mode) + 1)

#define DAC5571_POWERDOWN_FLAG		BIT(0)

#define DAC5571_CHANNEL_SELECT		1

#define DAC5571_LOADMODE_DIRECT		BIT(4)

#define DAC5571_SINGLE_PWRDWN_BITS	4

#define DAC5571_QUAD_PWRDWN_BITS	6



static int dac5571_cmd_single(struct dac5571_data *data, int channel, u16 val)

{

	unsigned int shift;



	shift = 12 - data->spec->resolution;

	data->buf[1] = val << shift;

	data->buf[0] = val >> (8 - shift);



	if (i2c_master_send(data->client, data->buf, 2) != 2)

		return -EIO;



	return 0;

}



static int dac5571_cmd_quad(struct dac5571_data *data, int channel, u16 val)

{

	unsigned int shift;



	shift = 16 - data->spec->resolution;

	data->buf[2] = val << shift;

	data->buf[1] = (val >> (8 - shift));

	data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) |

		       DAC5571_LOADMODE_DIRECT;



	if (i2c_master_send(data->client, data->buf, 3) != 3)

		return -EIO;



	return 0;

}



static int dac5571_pwrdwn_single(struct dac5571_data *data, int channel, u8 pwrdwn)

{

	unsigned int shift;



	shift = 12 - data->spec->resolution;

	data->buf[1] = 0;

	data->buf[0] = pwrdwn << DAC5571_SINGLE_PWRDWN_BITS;



	if (i2c_master_send(data->client, data->buf, 2) != 2)

		return -EIO;



	return 0;

}



static int dac5571_pwrdwn_quad(struct dac5571_data *data, int channel, u8 pwrdwn)

{

	unsigned int shift;



	shift = 16 - data->spec->resolution;

	data->buf[2] = 0;

	data->buf[1] = pwrdwn << DAC5571_QUAD_PWRDWN_BITS;

	data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) |

		       DAC5571_LOADMODE_DIRECT | DAC5571_POWERDOWN_FLAG;



	if (i2c_master_send(data->client, data->buf, 3) != 3)

		return -EIO;



	return 0;

}



static const char *const dac5571_powerdown_modes[] = {

	"1kohm_to_gnd", "100kohm_to_gnd", "three_state",

};



static int dac5571_get_powerdown_mode(struct iio_dev *indio_dev,

				      const struct iio_chan_spec *chan)

{

	struct dac5571_data *data = iio_priv(indio_dev);



	return data->powerdown_mode;

}



static int dac5571_set_powerdown_mode(struct iio_dev *indio_dev,

				      const struct iio_chan_spec *chan,

				      unsigned int mode)

{

	struct dac5571_data *data = iio_priv(indio_dev);

	int ret = 0;



	if (data->powerdown_mode == mode)

		return 0;



	mutex_lock(&data->lock);

	if (data->powerdown) {

		ret = data->dac5571_pwrdwn(data, chan->channel,

					   DAC5571_POWERDOWN(mode));

		if (ret)

			goto out;

	}

	data->powerdown_mode = mode;



 out:

	mutex_unlock(&data->lock);



	return ret;

}



static const struct iio_enum dac5571_powerdown_mode = {

	.items = dac5571_powerdown_modes,

	.num_items = ARRAY_SIZE(dac5571_powerdown_modes),

	.get = dac5571_get_powerdown_mode,

	.set = dac5571_set_powerdown_mode,

};



static ssize_t dac5571_read_powerdown(struct iio_dev *indio_dev,

				      uintptr_t private,

				      const struct iio_chan_spec *chan,

				      char *buf)

{

	struct dac5571_data *data = iio_priv(indio_dev);



	return sprintf(buf, "%d\n", data->powerdown);

}



static ssize_t dac5571_write_powerdown(struct iio_dev *indio_dev,

				       uintptr_t private,

				       const struct iio_chan_spec *chan,

				       const char *buf, size_t len)

{

	struct dac5571_data *data = iio_priv(indio_dev);

	bool powerdown;

	int ret;



	ret = strtobool(buf, &powerdown);

	if (ret)

		return ret;



	if (data->powerdown == powerdown)

		return len;



	mutex_lock(&data->lock);

	if (powerdown)

		ret = data->dac5571_pwrdwn(data, chan->channel,

			    DAC5571_POWERDOWN(data->powerdown_mode));

	else

		ret = data->dac5571_cmd(data, chan->channel, data->val[0]);

	if (ret)

		goto out;



	data->powerdown = powerdown;



 out:

	mutex_unlock(&data->lock);



	return ret ? ret : len;

}





static const struct iio_chan_spec_ext_info dac5571_ext_info[] = {

	{

		.name	   = "powerdown",

		.read	   = dac5571_read_powerdown,

		.write	   = dac5571_write_powerdown,

		.shared	   = IIO_SHARED_BY_TYPE,

	},

	IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, &dac5571_powerdown_mode),

	IIO_ENUM_AVAILABLE("powerdown_mode", &dac5571_powerdown_mode),

	{},

};



#define dac5571_CHANNEL(chan, name) {				\

	.type = IIO_VOLTAGE,					\

	.channel = (chan),					\

	.address = (chan),					\

	.indexed = true,					\

	.output = true,						\

	.datasheet_name = name,					\

	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\

	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\

	.ext_info = dac5571_ext_info,				\

}



static const struct iio_chan_spec dac5571_channels[] = {

	dac5571_CHANNEL(0, "A"),

	dac5571_CHANNEL(1, "B"),

	dac5571_CHANNEL(2, "C"),

	dac5571_CHANNEL(3, "D"),

};



static int dac5571_read_raw(struct iio_dev *indio_dev,

			    struct iio_chan_spec const *chan,

			    int *val, int *val2, long mask)

{

	struct dac5571_data *data = iio_priv(indio_dev);

	int ret;



	switch (mask) {

	case IIO_CHAN_INFO_RAW:

		*val = data->val[chan->channel];

		return IIO_VAL_INT;



	case IIO_CHAN_INFO_SCALE:

		ret = regulator_get_voltage(data->vref);

		if (ret < 0)

			return ret;



		*val = ret / 1000;

		*val2 = data->spec->resolution;

		return IIO_VAL_FRACTIONAL_LOG2;



	default:

		return -EINVAL;

	}

}



static int dac5571_write_raw(struct iio_dev *indio_dev,

			     struct iio_chan_spec const *chan,

			     int val, int val2, long mask)

{

	struct dac5571_data *data = iio_priv(indio_dev);

	int ret;



	switch (mask) {

	case IIO_CHAN_INFO_RAW:

		if (data->val[chan->channel] == val)

			return 0;



		if (val >= (1 << data->spec->resolution) || val < 0)

			return -EINVAL;



		if (data->powerdown)

			return -EBUSY;



		mutex_lock(&data->lock);

		ret = data->dac5571_cmd(data, chan->channel, val);

		if (ret == 0)

			data->val[chan->channel] = val;

		mutex_unlock(&data->lock);

		return ret;



	default:

		return -EINVAL;

	}

}



static int dac5571_write_raw_get_fmt(struct iio_dev *indio_dev,

				     struct iio_chan_spec const *chan,

				     long mask)

{

	return IIO_VAL_INT;

}



static const struct iio_info dac5571_info = {

	.read_raw = dac5571_read_raw,

	.write_raw = dac5571_write_raw,

	.write_raw_get_fmt = dac5571_write_raw_get_fmt,

};



static int dac5571_probe(struct i2c_client *client,

			 const struct i2c_device_id *id)

{

	struct device *dev = &client->dev;

	const struct dac5571_spec *spec;

	struct dac5571_data *data;

	struct iio_dev *indio_dev;

	int ret, i;



	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));

	if (!indio_dev)

		return -ENOMEM;



	data = iio_priv(indio_dev);

	i2c_set_clientdata(client, indio_dev);

	data->client = client;



	indio_dev->dev.parent = dev;

	indio_dev->dev.of_node = client->dev.of_node;

	indio_dev->info = &dac5571_info;

	indio_dev->name = id->name;

	indio_dev->modes = INDIO_DIRECT_MODE;

	indio_dev->channels = dac5571_channels;



	spec = &dac5571_spec[id->driver_data];

	indio_dev->num_channels = spec->num_channels;

	data->spec = spec;



	data->vref = devm_regulator_get(dev, "vref");

	if (IS_ERR(data->vref))

		return PTR_ERR(data->vref);



	ret = regulator_enable(data->vref);

	if (ret < 0)

		return ret;



	mutex_init(&data->lock);



	switch (spec->num_channels) {

	case 1:

		data->dac5571_cmd = dac5571_cmd_single;

		data->dac5571_pwrdwn = dac5571_pwrdwn_single;

		break;

	case 4:

		data->dac5571_cmd = dac5571_cmd_quad;

		data->dac5571_pwrdwn = dac5571_pwrdwn_quad;

		break;

	default:

		goto err;

	}



	for (i = 0; i < spec->num_channels; i++) {

		ret = data->dac5571_cmd(data, i, 0);

		if (ret) {

			dev_err(dev, "failed to initialize channel %d to 0\n", i);

			goto err;

		}

	}



	ret = iio_device_register(indio_dev);

	if (ret)

		goto err;



	return 0;



 err:

	regulator_disable(data->vref);

	return ret;

}



static int dac5571_remove(struct i2c_client *i2c)

{

	struct iio_dev *indio_dev = i2c_get_clientdata(i2c);

	struct dac5571_data *data = iio_priv(indio_dev);



	iio_device_unregister(indio_dev);

	regulator_disable(data->vref);



	return 0;

}



#ifdef CONFIG_OF

static const struct of_device_id dac5571_of_id[] = {

	{.compatible = "ti,dac5571"},

	{.compatible = "ti,dac6571"},

	{.compatible = "ti,dac7571"},

	{.compatible = "ti,dac5574"},

	{.compatible = "ti,dac6574"},

	{.compatible = "ti,dac7574"},

	{.compatible = "ti,dac5573"},

	{.compatible = "ti,dac6573"},

	{.compatible = "ti,dac7573"},

	{}

};

MODULE_DEVICE_TABLE(of, dac5571_of_id);

#endif



static const struct i2c_device_id dac5571_id[] = {

	{"dac5571", single_8bit},

	{"dac6571", single_10bit},

	{"dac7571", single_12bit},

	{"dac5574", quad_8bit},

	{"dac6574", quad_10bit},

	{"dac7574", quad_12bit},

	{"dac5573", quad_8bit},

	{"dac6573", quad_10bit},

	{"dac7573", quad_12bit},

	{}

};

MODULE_DEVICE_TABLE(i2c, dac5571_id);



static struct i2c_driver dac5571_driver = {

	.driver = {

		   .name = "ti-dac5571",

	},

	.probe	  = dac5571_probe,

	.remove   = dac5571_remove,

	.id_table = dac5571_id,

};

module_i2c_driver(dac5571_driver);



MODULE_AUTHOR("Sean Nyekjaer <sean.nyekjaer@prevas.dk>");

MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 1/4-channel DAC driver");

MODULE_LICENSE("GPL v2");