--- /dev/null
+/*
+ * 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");
projects / openwrt / staging / blogic.git / commitdiff