1 files changed, 657 insertions, 0 deletions

diff --git a/drivers/iio/dac/ad5380.c b/drivers/iio/dac/ad5380.c
new file mode 100644
index 000000000000..5dfb4451728f
--- /dev/null
+++ b/drivers/iio/dac/ad5380.c
@@ -0,0 +1,657 @@
+/*
+ * Analog devices AD5380, AD5381, AD5382, AD5383, AD5390, AD5391, AD5392
+ * multi-channel Digital to Analog Converters driver
+ *
+ * Copyright 2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#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
+ */
+
+struct ad5380_state {
+        struct regmap                   *regmap;
+        const struct ad5380_chip_info   *chip_info;
+        struct regulator                *vref_reg;
+        int                             vref;
+        bool                            pwr_down;
+};
+
+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 sprintf(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 = strtobool(buf, &pwr_down);
+        if (ret)
+                return ret;
+
+        mutex_lock(&indio_dev->mlock);
+
+        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(&indio_dev->mlock);
+
+        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 0:
+                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);
+        unsigned long scale_uv;
+        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:
+                scale_uv = ((2 * st->vref) >> chan->scan_type.realbits) * 100;
+                *val =  scale_uv / 100000;
+                *val2 = (scale_uv % 100000) * 10;
+                return IIO_VAL_INT_PLUS_MICRO;
+        default:
+                break;
+        }
+
+        return -EINVAL;
+}
+
+static const struct iio_info ad5380_info = {
+        .read_raw = ad5380_read_raw,
+        .write_raw = ad5380_write_raw,
+        .driver_module = THIS_MODULE,
+};
+
+static struct iio_chan_spec_ext_info ad5380_ext_info[] = {
+        {
+                .name = "powerdown",
+                .read = ad5380_read_dac_powerdown,
+                .write = ad5380_write_dac_powerdown,
+        },
+        IIO_ENUM("powerdown_mode", true, &ad5380_powerdown_mode_enum),
+        IIO_ENUM_AVAILABLE("powerdown_mode", &ad5380_powerdown_mode_enum),
+        { },
+};
+
+#define AD5380_CHANNEL(_bits) {                                 \
+        .type = IIO_VOLTAGE,                                    \
+        .indexed = 1,                                           \
+        .output = 1,                                            \
+        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |           \
+                IIO_CHAN_INFO_SCALE_SHARED_BIT |                \
+                IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT |         \
+                IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT,           \
+        .scan_type = IIO_ST('u', (_bits), 16, 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 = 1250000,
+        },
+        [ID_AD5380_5] = {
+                .channel_template = AD5380_CHANNEL(14),
+                .num_channels = 40,
+                .int_vref = 2500000,
+        },
+        [ID_AD5381_3] = {
+                .channel_template = AD5380_CHANNEL(12),
+                .num_channels = 16,
+                .int_vref = 1250000,
+        },
+        [ID_AD5381_5] = {
+                .channel_template = AD5380_CHANNEL(12),
+                .num_channels = 16,
+                .int_vref = 2500000,
+        },
+        [ID_AD5382_3] = {
+                .channel_template = AD5380_CHANNEL(14),
+                .num_channels = 32,
+                .int_vref = 1250000,
+        },
+        [ID_AD5382_5] = {
+                .channel_template = AD5380_CHANNEL(14),
+                .num_channels = 32,
+                .int_vref = 2500000,
+        },
+        [ID_AD5383_3] = {
+                .channel_template = AD5380_CHANNEL(12),
+                .num_channels = 32,
+                .int_vref = 1250000,
+        },
+        [ID_AD5383_5] = {
+                .channel_template = AD5380_CHANNEL(12),
+                .num_channels = 32,
+                .int_vref = 2500000,
+        },
+        [ID_AD5390_3] = {
+                .channel_template = AD5380_CHANNEL(14),
+                .num_channels = 16,
+                .int_vref = 1250000,
+        },
+        [ID_AD5390_5] = {
+                .channel_template = AD5380_CHANNEL(14),
+                .num_channels = 16,
+                .int_vref = 2500000,
+        },
+        [ID_AD5391_3] = {
+                .channel_template = AD5380_CHANNEL(12),
+                .num_channels = 16,
+                .int_vref = 1250000,
+        },
+        [ID_AD5391_5] = {
+                .channel_template = AD5380_CHANNEL(12),
+                .num_channels = 16,
+                .int_vref = 2500000,
+        },
+        [ID_AD5392_3] = {
+                .channel_template = AD5380_CHANNEL(14),
+                .num_channels = 8,
+                .int_vref = 1250000,
+        },
+        [ID_AD5392_5] = {
+                .channel_template = AD5380_CHANNEL(14),
+                .num_channels = 8,
+                .int_vref = 2500000,
+        },
+};
+
+static int __devinit 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 __devinit 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 = iio_device_alloc(sizeof(*st));
+        if (indio_dev == NULL) {
+                dev_err(dev, "Failed to allocate iio device\n");
+                ret = -ENOMEM;
+                goto error_regmap_exit;
+        }
+
+        st = iio_priv(indio_dev);
+        dev_set_drvdata(dev, indio_dev);
+
+        st->chip_info = &ad5380_chip_info_tbl[type];
+        st->regmap = regmap;
+
+        indio_dev->dev.parent = dev;
+        indio_dev->name = name;
+        indio_dev->info = &ad5380_info;
+        indio_dev->modes = INDIO_DIRECT_MODE;
+        indio_dev->num_channels = st->chip_info->num_channels;
+
+        ret = ad5380_alloc_channels(indio_dev);
+        if (ret) {
+                dev_err(dev, "Failed to allocate channel spec: %d\n", ret);
+                goto error_free;
+        }
+
+        if (st->chip_info->int_vref == 2500000)
+                ctrl |= AD5380_CTRL_INT_VREF_2V5;
+
+        st->vref_reg = 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;
+                }
+
+                st->vref = regulator_get_voltage(st->vref_reg);
+        } 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:
+        if (!IS_ERR(st->vref_reg))
+                regulator_put(st->vref_reg);
+
+        kfree(indio_dev->channels);
+error_free:
+        iio_device_free(indio_dev);
+error_regmap_exit:
+        regmap_exit(regmap);
+
+        return ret;
+}
+
+static int __devexit 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);
+                regulator_put(st->vref_reg);
+        }
+
+        regmap_exit(st->regmap);
+        iio_device_free(indio_dev);
+
+        return 0;
+}
+
+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 __devinit ad5380_spi_probe(struct spi_device *spi)
+{
+        const struct spi_device_id *id = spi_get_device_id(spi);
+        struct regmap *regmap;
+
+        regmap = 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 int __devexit ad5380_spi_remove(struct spi_device *spi)
+{
+        return 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",
+                   .owner = THIS_MODULE,
+        },
+        .probe = ad5380_spi_probe,
+        .remove = __devexit_p(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 __devinit ad5380_i2c_probe(struct i2c_client *i2c,
+        const struct i2c_device_id *id)
+{
+        struct regmap *regmap;
+
+        regmap = 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 __devexit ad5380_i2c_remove(struct i2c_client *i2c)
+{
+        return ad5380_remove(&i2c->dev);
+}
+
+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",
+                   .owner = THIS_MODULE,
+        },
+        .probe = ad5380_i2c_probe,
+        .remove = __devexit_p(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");