// SPDX-License-Identifier: GPL-2.0-only /* * Analog devices AD5380, AD5381, AD5382, AD5383, AD5390, AD5391, AD5392 * multi-channel Digital to Analog Converters driver * * Copyright 2011 Analog Devices Inc. */ #include <linux/device.h> #include <linux/err.h> #include <linux/i2c.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/spi/spi.h> #include <linux/slab.h> #include <linux/sysfs.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #define AD5380_REG_DATA(x) (((x) << 2) | 3) #define AD5380_REG_OFFSET(x) (((x) << 2) | 2) #define AD5380_REG_GAIN(x) (((x) << 2) | 1) #define AD5380_REG_SF_PWR_DOWN (8 << 2) #define AD5380_REG_SF_PWR_UP (9 << 2) #define AD5380_REG_SF_CTRL (12 << 2) #define AD5380_CTRL_PWR_DOWN_MODE_OFFSET 13 #define AD5380_CTRL_INT_VREF_2V5 BIT(12) #define AD5380_CTRL_INT_VREF_EN BIT(10) /** * struct ad5380_chip_info - chip specific information * @channel_template: channel specification template * @num_channels: number of channels * @int_vref: internal vref in uV */ struct ad5380_chip_info { struct iio_chan_spec channel_template; unsigned int num_channels; unsigned int int_vref; }; /** * struct ad5380_state - driver instance specific data * @regmap: regmap instance used by the device * @chip_info: chip model specific constants, available modes etc * @vref_reg: vref supply regulator * @vref: actual reference voltage used in uA * @pwr_down: whether the chip is currently in power down mode * @lock: lock to protect the data buffer during regmap ops */ struct ad5380_state { struct regmap *regmap; const struct ad5380_chip_info *chip_info; struct regulator *vref_reg; int vref; bool pwr_down; struct mutex lock; }; enum ad5380_type { ID_AD5380_3, ID_AD5380_5, ID_AD5381_3, ID_AD5381_5, ID_AD5382_3, ID_AD5382_5, ID_AD5383_3, ID_AD5383_5, ID_AD5390_3, ID_AD5390_5, ID_AD5391_3, ID_AD5391_5, ID_AD5392_3, ID_AD5392_5, }; static ssize_t ad5380_read_dac_powerdown(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, char *buf) { struct ad5380_state *st = iio_priv(indio_dev); return sysfs_emit(buf, "%d\n", st->pwr_down); } static ssize_t ad5380_write_dac_powerdown(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, const char *buf, size_t len) { struct ad5380_state *st = iio_priv(indio_dev); bool pwr_down; int ret; ret = kstrtobool(buf, &pwr_down); if (ret) return ret; mutex_lock(&st->lock); if (pwr_down) ret = regmap_write(st->regmap, AD5380_REG_SF_PWR_DOWN, 0); else ret = regmap_write(st->regmap, AD5380_REG_SF_PWR_UP, 0); st->pwr_down = pwr_down; mutex_unlock(&st->lock); return ret ? ret : len; } static const char * const ad5380_powerdown_modes[] = { "100kohm_to_gnd", "three_state", }; static int ad5380_get_powerdown_mode(struct iio_dev *indio_dev, const struct iio_chan_spec *chan) { struct ad5380_state *st = iio_priv(indio_dev); unsigned int mode; int ret; ret = regmap_read(st->regmap, AD5380_REG_SF_CTRL, &mode); if (ret) return ret; mode = (mode >> AD5380_CTRL_PWR_DOWN_MODE_OFFSET) & 1; return mode; } static int ad5380_set_powerdown_mode(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, unsigned int mode) { struct ad5380_state *st = iio_priv(indio_dev); int ret; ret = regmap_update_bits(st->regmap, AD5380_REG_SF_CTRL, 1 << AD5380_CTRL_PWR_DOWN_MODE_OFFSET, mode << AD5380_CTRL_PWR_DOWN_MODE_OFFSET); return ret; } static const struct iio_enum ad5380_powerdown_mode_enum = { .items = ad5380_powerdown_modes, .num_items = ARRAY_SIZE(ad5380_powerdown_modes), .get = ad5380_get_powerdown_mode, .set = ad5380_set_powerdown_mode, }; static unsigned int ad5380_info_to_reg(struct iio_chan_spec const *chan, long info) { switch (info) { case IIO_CHAN_INFO_RAW: return AD5380_REG_DATA(chan->address); case IIO_CHAN_INFO_CALIBBIAS: return AD5380_REG_OFFSET(chan->address); case IIO_CHAN_INFO_CALIBSCALE: return AD5380_REG_GAIN(chan->address); default: break; } return 0; } static int ad5380_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long info) { const unsigned int max_val = (1 << chan->scan_type.realbits); struct ad5380_state *st = iio_priv(indio_dev); switch (info) { case IIO_CHAN_INFO_RAW: case IIO_CHAN_INFO_CALIBSCALE: if (val >= max_val || val < 0) return -EINVAL; return regmap_write(st->regmap, ad5380_info_to_reg(chan, info), val << chan->scan_type.shift); case IIO_CHAN_INFO_CALIBBIAS: val += (1 << chan->scan_type.realbits) / 2; if (val >= max_val || val < 0) return -EINVAL; return regmap_write(st->regmap, AD5380_REG_OFFSET(chan->address), val << chan->scan_type.shift); default: break; } return -EINVAL; } static int ad5380_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long info) { struct ad5380_state *st = iio_priv(indio_dev); int ret; switch (info) { case IIO_CHAN_INFO_RAW: case IIO_CHAN_INFO_CALIBSCALE: ret = regmap_read(st->regmap, ad5380_info_to_reg(chan, info), val); if (ret) return ret; *val >>= chan->scan_type.shift; return IIO_VAL_INT; case IIO_CHAN_INFO_CALIBBIAS: ret = regmap_read(st->regmap, AD5380_REG_OFFSET(chan->address), val); if (ret) return ret; *val >>= chan->scan_type.shift; *val -= (1 << chan->scan_type.realbits) / 2; return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: *val = 2 * st->vref; *val2 = chan->scan_type.realbits; return IIO_VAL_FRACTIONAL_LOG2; default: break; } return -EINVAL; } static const struct iio_info ad5380_info = { .read_raw = ad5380_read_raw, .write_raw = ad5380_write_raw, }; static const struct iio_chan_spec_ext_info ad5380_ext_info[] = { { .name = "powerdown", .read = ad5380_read_dac_powerdown, .write = ad5380_write_dac_powerdown, .shared = IIO_SEPARATE, }, IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, &ad5380_powerdown_mode_enum), IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, &ad5380_powerdown_mode_enum), { }, }; #define AD5380_CHANNEL(_bits) { \ .type = IIO_VOLTAGE, \ .indexed = 1, \ .output = 1, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ BIT(IIO_CHAN_INFO_CALIBSCALE) | \ BIT(IIO_CHAN_INFO_CALIBBIAS), \ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ .scan_type = { \ .sign = 'u', \ .realbits = (_bits), \ .storagebits = 16, \ .shift = 14 - (_bits), \ }, \ .ext_info = ad5380_ext_info, \ } static const struct ad5380_chip_info ad5380_chip_info_tbl[] = { [ID_AD5380_3] = { .channel_template = AD5380_CHANNEL(14), .num_channels = 40, .int_vref = 1250, }, [ID_AD5380_5] = { .channel_template = AD5380_CHANNEL(14), .num_channels = 40, .int_vref = 2500, }, [ID_AD5381_3] = { .channel_template = AD5380_CHANNEL(12), .num_channels = 16, .int_vref = 1250, }, [ID_AD5381_5] = { .channel_template = AD5380_CHANNEL(12), .num_channels = 16, .int_vref = 2500, }, [ID_AD5382_3] = { .channel_template = AD5380_CHANNEL(14), .num_channels = 32, .int_vref = 1250, }, [ID_AD5382_5] = { .channel_template = AD5380_CHANNEL(14), .num_channels = 32, .int_vref = 2500, }, [ID_AD5383_3] = { .channel_template = AD5380_CHANNEL(12), .num_channels = 32, .int_vref = 1250, }, [ID_AD5383_5] = { .channel_template = AD5380_CHANNEL(12), .num_channels = 32, .int_vref = 2500, }, [ID_AD5390_3] = { .channel_template = AD5380_CHANNEL(14), .num_channels = 16, .int_vref = 1250, }, [ID_AD5390_5] = { .channel_template = AD5380_CHANNEL(14), .num_channels = 16, .int_vref = 2500, }, [ID_AD5391_3] = { .channel_template = AD5380_CHANNEL(12), .num_channels = 16, .int_vref = 1250, }, [ID_AD5391_5] = { .channel_template = AD5380_CHANNEL(12), .num_channels = 16, .int_vref = 2500, }, [ID_AD5392_3] = { .channel_template = AD5380_CHANNEL(14), .num_channels = 8, .int_vref = 1250, }, [ID_AD5392_5] = { .channel_template = AD5380_CHANNEL(14), .num_channels = 8, .int_vref = 2500, }, }; static int ad5380_alloc_channels(struct iio_dev *indio_dev) { struct ad5380_state *st = iio_priv(indio_dev); struct iio_chan_spec *channels; unsigned int i; channels = kcalloc(st->chip_info->num_channels, sizeof(struct iio_chan_spec), GFP_KERNEL); if (!channels) return -ENOMEM; for (i = 0; i < st->chip_info->num_channels; ++i) { channels[i] = st->chip_info->channel_template; channels[i].channel = i; channels[i].address = i; } indio_dev->channels = channels; return 0; } static int ad5380_probe(struct device *dev, struct regmap *regmap, enum ad5380_type type, const char *name) { struct iio_dev *indio_dev; struct ad5380_state *st; unsigned int ctrl = 0; int ret; indio_dev = devm_iio_device_alloc(dev, sizeof(*st)); if (indio_dev == NULL) { dev_err(dev, "Failed to allocate iio device\n"); return -ENOMEM; } st = iio_priv(indio_dev); dev_set_drvdata(dev, indio_dev); st->chip_info = &ad5380_chip_info_tbl[type]; st->regmap = regmap; indio_dev->name = name; indio_dev->info = &ad5380_info; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->num_channels = st->chip_info->num_channels; mutex_init(&st->lock); ret = ad5380_alloc_channels(indio_dev); if (ret) { dev_err(dev, "Failed to allocate channel spec: %d\n", ret); return ret; } if (st->chip_info->int_vref == 2500) ctrl |= AD5380_CTRL_INT_VREF_2V5; st->vref_reg = devm_regulator_get(dev, "vref"); if (!IS_ERR(st->vref_reg)) { ret = regulator_enable(st->vref_reg); if (ret) { dev_err(dev, "Failed to enable vref regulators: %d\n", ret); goto error_free_reg; } ret = regulator_get_voltage(st->vref_reg); if (ret < 0) goto error_disable_reg; st->vref = ret / 1000; } else { st->vref = st->chip_info->int_vref; ctrl |= AD5380_CTRL_INT_VREF_EN; } ret = regmap_write(st->regmap, AD5380_REG_SF_CTRL, ctrl); if (ret) { dev_err(dev, "Failed to write to device: %d\n", ret); goto error_disable_reg; } ret = iio_device_register(indio_dev); if (ret) { dev_err(dev, "Failed to register iio device: %d\n", ret); goto error_disable_reg; } return 0; error_disable_reg: if (!IS_ERR(st->vref_reg)) regulator_disable(st->vref_reg); error_free_reg: kfree(indio_dev->channels); return ret; } static void ad5380_remove(struct device *dev) { struct iio_dev *indio_dev = dev_get_drvdata(dev); struct ad5380_state *st = iio_priv(indio_dev); iio_device_unregister(indio_dev); kfree(indio_dev->channels); if (!IS_ERR(st->vref_reg)) regulator_disable(st->vref_reg); } static bool ad5380_reg_false(struct device *dev, unsigned int reg) { return false; } static const struct regmap_config ad5380_regmap_config = { .reg_bits = 10, .val_bits = 14, .max_register = AD5380_REG_DATA(40), .cache_type = REGCACHE_RBTREE, .volatile_reg = ad5380_reg_false, .readable_reg = ad5380_reg_false, }; #if IS_ENABLED(CONFIG_SPI_MASTER) static int ad5380_spi_probe(struct spi_device *spi) { const struct spi_device_id *id = spi_get_device_id(spi); struct regmap *regmap; regmap = devm_regmap_init_spi(spi, &ad5380_regmap_config); if (IS_ERR(regmap)) return PTR_ERR(regmap); return ad5380_probe(&spi->dev, regmap, id->driver_data, id->name); } static void ad5380_spi_remove(struct spi_device *spi) { ad5380_remove(&spi->dev); } static const struct spi_device_id ad5380_spi_ids[] = { { "ad5380-3", ID_AD5380_3 }, { "ad5380-5", ID_AD5380_5 }, { "ad5381-3", ID_AD5381_3 }, { "ad5381-5", ID_AD5381_5 }, { "ad5382-3", ID_AD5382_3 }, { "ad5382-5", ID_AD5382_5 }, { "ad5383-3", ID_AD5383_3 }, { "ad5383-5", ID_AD5383_5 }, { "ad5384-3", ID_AD5380_3 }, { "ad5384-5", ID_AD5380_5 }, { "ad5390-3", ID_AD5390_3 }, { "ad5390-5", ID_AD5390_5 }, { "ad5391-3", ID_AD5391_3 }, { "ad5391-5", ID_AD5391_5 }, { "ad5392-3", ID_AD5392_3 }, { "ad5392-5", ID_AD5392_5 }, { } }; MODULE_DEVICE_TABLE(spi, ad5380_spi_ids); static struct spi_driver ad5380_spi_driver = { .driver = { .name = "ad5380", }, .probe = ad5380_spi_probe, .remove = ad5380_spi_remove, .id_table = ad5380_spi_ids, }; static inline int ad5380_spi_register_driver(void) { return spi_register_driver(&ad5380_spi_driver); } static inline void ad5380_spi_unregister_driver(void) { spi_unregister_driver(&ad5380_spi_driver); } #else static inline int ad5380_spi_register_driver(void) { return 0; } static inline void ad5380_spi_unregister_driver(void) { } #endif #if IS_ENABLED(CONFIG_I2C) static int ad5380_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { struct regmap *regmap; regmap = devm_regmap_init_i2c(i2c, &ad5380_regmap_config); if (IS_ERR(regmap)) return PTR_ERR(regmap); return ad5380_probe(&i2c->dev, regmap, id->driver_data, id->name); } static int ad5380_i2c_remove(struct i2c_client *i2c) { ad5380_remove(&i2c->dev); return 0; } static const struct i2c_device_id ad5380_i2c_ids[] = { { "ad5380-3", ID_AD5380_3 }, { "ad5380-5", ID_AD5380_5 }, { "ad5381-3", ID_AD5381_3 }, { "ad5381-5", ID_AD5381_5 }, { "ad5382-3", ID_AD5382_3 }, { "ad5382-5", ID_AD5382_5 }, { "ad5383-3", ID_AD5383_3 }, { "ad5383-5", ID_AD5383_5 }, { "ad5384-3", ID_AD5380_3 }, { "ad5384-5", ID_AD5380_5 }, { "ad5390-3", ID_AD5390_3 }, { "ad5390-5", ID_AD5390_5 }, { "ad5391-3", ID_AD5391_3 }, { "ad5391-5", ID_AD5391_5 }, { "ad5392-3", ID_AD5392_3 }, { "ad5392-5", ID_AD5392_5 }, { } }; MODULE_DEVICE_TABLE(i2c, ad5380_i2c_ids); static struct i2c_driver ad5380_i2c_driver = { .driver = { .name = "ad5380", }, .probe = ad5380_i2c_probe, .remove = ad5380_i2c_remove, .id_table = ad5380_i2c_ids, }; static inline int ad5380_i2c_register_driver(void) { return i2c_add_driver(&ad5380_i2c_driver); } static inline void ad5380_i2c_unregister_driver(void) { i2c_del_driver(&ad5380_i2c_driver); } #else static inline int ad5380_i2c_register_driver(void) { return 0; } static inline void ad5380_i2c_unregister_driver(void) { } #endif static int __init ad5380_spi_init(void) { int ret; ret = ad5380_spi_register_driver(); if (ret) return ret; ret = ad5380_i2c_register_driver(); if (ret) { ad5380_spi_unregister_driver(); return ret; } return 0; } module_init(ad5380_spi_init); static void __exit ad5380_spi_exit(void) { ad5380_i2c_unregister_driver(); ad5380_spi_unregister_driver(); } module_exit(ad5380_spi_exit); MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); MODULE_DESCRIPTION("Analog Devices AD5380/81/82/83/84/90/91/92 DAC"); MODULE_LICENSE("GPL v2");