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path: root/drivers/iio/dac/ad5446.c
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Diffstat (limited to 'drivers/iio/dac/ad5446.c')
-rw-r--r--drivers/iio/dac/ad5446.c569
1 files changed, 80 insertions, 489 deletions
diff --git a/drivers/iio/dac/ad5446.c b/drivers/iio/dac/ad5446.c
index cae8f6056ac3..46a2eadb1d9b 100644
--- a/drivers/iio/dac/ad5446.c
+++ b/drivers/iio/dac/ad5446.c
@@ -1,68 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
- * AD5446 SPI DAC driver
+ * AD5446 CORE DAC driver
*
* Copyright 2010 Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later.
*/
-#include <linux/interrupt.h>
-#include <linux/workqueue.h>
+#include <linux/array_size.h>
+#include <linux/cleanup.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/export.h>
+#include <linux/iio/iio.h>
+#include <linux/kstrtox.h>
#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/regulator/consumer.h>
+#include <linux/sysfs.h>
-#include <linux/iio/iio.h>
-#include <linux/iio/sysfs.h>
+#include "ad5446.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)
+ const struct iio_chan_spec *chan,
+ unsigned int mode)
{
struct ad5446_state *st = iio_priv(indio_dev);
@@ -72,7 +39,7 @@ static int ad5446_set_powerdown_mode(struct iio_dev *indio_dev,
}
static int ad5446_get_powerdown_mode(struct iio_dev *indio_dev,
- const struct iio_chan_spec *chan)
+ const struct iio_chan_spec *chan)
{
struct ad5446_state *st = iio_priv(indio_dev);
@@ -87,19 +54,19 @@ static const struct iio_enum ad5446_powerdown_mode_enum = {
};
static ssize_t ad5446_read_dac_powerdown(struct iio_dev *indio_dev,
- uintptr_t private,
- const struct iio_chan_spec *chan,
- char *buf)
+ 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);
+ return sysfs_emit(buf, "%d\n", st->pwr_down);
}
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)
+ 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;
@@ -107,11 +74,11 @@ static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev,
bool powerdown;
int ret;
- ret = strtobool(buf, &powerdown);
+ ret = kstrtobool(buf, &powerdown);
if (ret)
return ret;
- mutex_lock(&indio_dev->mlock);
+ guard(mutex)(&st->lock);
st->pwr_down = powerdown;
if (st->pwr_down) {
@@ -122,38 +89,24 @@ static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev,
}
ret = st->chip_info->write(st, val);
- mutex_unlock(&indio_dev->mlock);
+ if (ret)
+ return ret;
- return ret ? ret : len;
+ return len;
}
-static const struct iio_chan_spec_ext_info ad5446_ext_info_powerdown[] = {
+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", false, &ad5446_powerdown_mode_enum),
- IIO_ENUM_AVAILABLE("powerdown_mode", &ad5446_powerdown_mode_enum),
- { },
+ IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5446_powerdown_mode_enum),
+ IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, &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 = IIO_ST('u', (bits), (storage), (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)
+EXPORT_SYMBOL_NS_GPL(ad5446_ext_info_powerdown, "IIO_AD5446");
static int ad5446_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
@@ -162,462 +115,100 @@ static int ad5446_read_raw(struct iio_dev *indio_dev,
long m)
{
struct ad5446_state *st = iio_priv(indio_dev);
- unsigned long scale_uv;
switch (m) {
case IIO_CHAN_INFO_RAW:
- *val = st->cached_val;
+ *val = st->cached_val >> chan->scan_type.shift;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
- scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
- *val = scale_uv / 1000;
- *val2 = (scale_uv % 1000) * 1000;
- return IIO_VAL_INT_PLUS_MICRO;
-
+ *val = st->vref_mv;
+ *val2 = chan->scan_type.realbits;
+ return IIO_VAL_FRACTIONAL_LOG2;
}
return -EINVAL;
}
-static int ad5446_write_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int val,
- int val2,
- long mask)
+static int ad5446_write_dac_raw(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ int val)
{
struct ad5446_state *st = iio_priv(indio_dev);
- int ret = 0;
+ if (val >= (1 << chan->scan_type.realbits) || val < 0)
+ return -EINVAL;
+
+ val <<= chan->scan_type.shift;
+ guard(mutex)(&st->lock);
+
+ st->cached_val = val;
+ if (st->pwr_down)
+ return 0;
+
+ return st->chip_info->write(st, val);
+}
+
+static int ad5446_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int val,
+ int val2, long mask)
+{
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;
+ return ad5446_write_dac_raw(indio_dev, chan, val);
default:
- ret = -EINVAL;
+ return -EINVAL;
}
-
- return ret;
}
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)
+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 = regulator_get(dev, "vcc");
- if (!IS_ERR(reg)) {
- ret = regulator_enable(reg);
- if (ret)
- goto error_put_reg;
+ int ret;
- ret = regulator_get_voltage(reg);
- if (ret < 0)
- goto error_disable_reg;
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+ if (!indio_dev)
+ return -ENOMEM;
- voltage_uv = ret;
- }
-
- indio_dev = iio_device_alloc(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);
+ ret = devm_mutex_init(dev, &st->lock);
if (ret)
- goto error_free_device;
-
- return 0;
-
-error_free_device:
- iio_device_free(indio_dev);
-error_disable_reg:
- if (!IS_ERR(reg))
- regulator_disable(reg);
-error_put_reg:
- if (!IS_ERR(reg))
- regulator_put(reg);
-
- return ret;
-}
-
-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);
- regulator_put(st->reg);
- }
- iio_device_free(indio_dev);
-
- return 0;
-}
-
-#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));
-}
-
-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));
-}
-
-/**
- * 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_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_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},
- {"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]);
-}
-
-static int ad5446_spi_remove(struct spi_device *spi)
-{
- return ad5446_remove(&spi->dev);
-}
-
-static struct spi_driver ad5446_spi_driver = {
- .driver = {
- .name = "ad5446",
- .owner = THIS_MODULE,
- },
- .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);
-}
-
-static void ad5446_spi_unregister_driver(void)
-{
- spi_unregister_driver(&ad5446_spi_driver);
-}
-
-#else
-
-static inline int ad5446_spi_register_driver(void) { return 0; }
-static inline void ad5446_spi_unregister_driver(void) { }
-
-#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));
-}
-
-/**
- * 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]);
-}
-
-static int ad5446_i2c_remove(struct i2c_client *i2c)
-{
- return ad5446_remove(&i2c->dev);
-}
-
-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",
- .owner = THIS_MODULE,
- },
- .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);
-}
-
-static void __exit ad5446_i2c_unregister_driver(void)
-{
- i2c_del_driver(&ad5446_i2c_driver);
-}
-
-#else
-
-static inline int ad5446_i2c_register_driver(void) { return 0; }
-static inline void ad5446_i2c_unregister_driver(void) { }
-
-#endif
+ return ret;
-static int __init ad5446_init(void)
-{
- int ret;
+ st->pwr_down_mode = MODE_PWRDWN_1k;
- ret = ad5446_spi_register_driver();
- if (ret)
+ ret = devm_regulator_get_enable_read_voltage(dev, "vcc");
+ if (ret < 0 && ret != -ENODEV)
return ret;
+ if (ret == -ENODEV) {
+ if (!chip_info->int_vref_mv)
+ return dev_err_probe(dev, ret,
+ "reference voltage unspecified\n");
- ret = ad5446_i2c_register_driver();
- if (ret) {
- ad5446_spi_unregister_driver();
- return ret;
+ st->vref_mv = chip_info->int_vref_mv;
+ } else {
+ st->vref_mv = ret / 1000;
}
- return 0;
-}
-module_init(ad5446_init);
-
-static void __exit ad5446_exit(void)
-{
- ad5446_i2c_unregister_driver();
- ad5446_spi_unregister_driver();
+ return devm_iio_device_register(dev, indio_dev);
}
-module_exit(ad5446_exit);
+EXPORT_SYMBOL_NS_GPL(ad5446_probe, "IIO_AD5446");
-MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
-MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC");
+MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
+MODULE_DESCRIPTION("Analog Devices CORE AD5446 DAC and similar devices");
MODULE_LICENSE("GPL v2");
generated by cgit (git 2.34.1) at 2025-12-25 17:50:59 +0000