This patch adds support for the Texas Intruments DAC5755 Family. Signed-off-by: Sean Nyekjaer <sean.nyekjaer@xxxxxxxxx> --- drivers/iio/dac/Kconfig | 10 ++ drivers/iio/dac/Makefile | 1 + drivers/iio/dac/ti-dac5571.c | 395 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 406 insertions(+) create mode 100644 drivers/iio/dac/ti-dac5571.c diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig index 965d5c0d2468..c78c02f455b9 100644 --- a/drivers/iio/dac/Kconfig +++ b/drivers/iio/dac/Kconfig @@ -320,6 +320,16 @@ 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. + + If compiled as a module, it will be called ti-dac5571. + config VF610_DAC tristate "Vybrid vf610 DAC driver" depends on OF diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile index 81e710ed7491..1ab358d522ee 100644 --- a/drivers/iio/dac/Makefile +++ b/drivers/iio/dac/Makefile @@ -35,4 +35,5 @@ 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 diff --git a/drivers/iio/dac/ti-dac5571.c b/drivers/iio/dac/ti-dac5571.c new file mode 100644 index 000000000000..cf4ba151ed7e --- /dev/null +++ b/drivers/iio/dac/ti-dac5571.c @@ -0,0 +1,395 @@ +/* + * 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/module.h> +#include <linux/regulator/consumer.h> +#include <linux/i2c.h> +#include <linux/of_device.h> +#include <linux/of.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; + u8 resolution; + u8 channels; + u8 buf[3] ____cacheline_aligned; +}; + +#define POWERDOWN(mode) ((mode) + 1) + +static int dac5571_cmd(struct dac5571_data *data, int channel, + u8 pwrdwn, u16 val) +{ + int ret; + u8 shift; + + switch (data->channels) { + case 1: + shift = 12 - data->resolution; + data->buf[0] = (val << shift); + data->buf[1] = pwrdwn << 4 | (val >> (8 - shift)); + ret = i2c_master_send(data->client, data->buf, 2); + break; + case 4: + shift = 16 - data->resolution; + data->buf[0] = val << shift; + data->buf[1] = val >> (8 - shift) | pwrdwn << 6; + data->buf[2] = channel << 1 | 1 << 4; + if (pwrdwn) + data->buf[2] |= 1; + ret = i2c_master_send(data->client, data->buf, 3); + break; + default: + ret = -EINVAL; + break; + }; + + return ret; +} + +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 = dac5571_cmd(data, chan->channel, POWERDOWN(mode), 0); + 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 = + dac5571_cmd(data, chan->channel, + POWERDOWN(data->powerdown_mode), 0); + else + ret = dac5571_cmd(data, chan->channel, 0, data->val[0]); + if (!ret) + data->powerdown = powerdown; + 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) { \ + .type = IIO_VOLTAGE, \ + .channel = (chan), \ + .address = (chan), \ + .indexed = true, \ + .output = true, \ + .datasheet_name = (const char[]){ 'A' + (chan), 0 }, \ + .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), + dac5571_CHANNEL(1), + dac5571_CHANNEL(2), + dac5571_CHANNEL(3), +}; + +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]; + ret = IIO_VAL_INT; + break; + + case IIO_CHAN_INFO_SCALE: + ret = regulator_get_voltage(data->vref); + if (ret < 0) + return ret; + + *val = ret / 1000; + *val2 = data->resolution; + ret = IIO_VAL_FRACTIONAL_LOG2; + break; + + default: + ret = -EINVAL; + } + + return ret; +} + +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->resolution) || val < 0) + return -EINVAL; + + if (data->powerdown) + return -EBUSY; + + mutex_lock(&data->lock); + ret = dac5571_cmd(data, chan->channel, 0, val); + if (!ret) + data->val[chan->channel] = val; + mutex_unlock(&data->lock); + break; + + default: + ret = -EINVAL; + } + + return ret; +} + +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; + + 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; + if (client->dev.of_node) + data->id = (enum chip_id)of_device_get_match_data(&client->dev); + else + data->id = id->driver_data; + + 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->resolution = spec->resolution; + data->channels = spec->num_channels; + + 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); + + ret = dac5571_cmd(data, 0, 0, 0); + if (ret) { + dev_err(dev, "failed to initialize outputs to 0\n"); + goto err; + } + + ret = iio_device_register(indio_dev); + if (ret) + goto err; + + return 0; + + err: + mutex_destroy(&data->lock); + 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); + mutex_destroy(&data->lock); + 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@xxxxxxxxx>"); +MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 1/4-channel DAC driver"); +MODULE_LICENSE("GPL v2"); -- 2.16.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
