diff options
Diffstat (limited to 'drivers/iio/dac')
-rw-r--r-- | drivers/iio/dac/Kconfig | 14 | ||||
-rw-r--r-- | drivers/iio/dac/Makefile | 1 | ||||
-rw-r--r-- | drivers/iio/dac/ad5761.c | 430 | ||||
-rw-r--r-- | drivers/iio/dac/mcp4725.c | 87 |
4 files changed, 510 insertions, 22 deletions
diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig index e701e28fb1cd..5dc71505da61 100644 --- a/drivers/iio/dac/Kconfig +++ b/drivers/iio/dac/Kconfig @@ -111,6 +111,16 @@ config AD5755 To compile this driver as a module, choose M here: the module will be called ad5755. +config AD5761 + tristate "Analog Devices AD5761/61R/21/21R DAC driver" + depends on SPI_MASTER + help + Say yes here to build support for Analog Devices AD5761, AD5761R, AD5721, + AD5721R Digital to Analog Converter. + + To compile this driver as a module, choose M here: the + module will be called ad5761. + config AD5764 tristate "Analog Devices AD5764/64R/44/44R DAC driver" depends on SPI_MASTER @@ -176,11 +186,11 @@ config MAX5821 10 bits DAC. config MCP4725 - tristate "MCP4725 DAC driver" + tristate "MCP4725/6 DAC driver" depends on I2C ---help--- Say Y here if you want to build a driver for the Microchip - MCP 4725 12-bit digital-to-analog converter (DAC) with I2C + MCP 4725/6 12-bit digital-to-analog converter (DAC) with I2C interface. To compile this driver as a module, choose M here: the module diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile index 63ae05633e0c..cb525b53fc7b 100644 --- a/drivers/iio/dac/Makefile +++ b/drivers/iio/dac/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_AD5504) += ad5504.o obj-$(CONFIG_AD5446) += ad5446.o obj-$(CONFIG_AD5449) += ad5449.o obj-$(CONFIG_AD5755) += ad5755.o +obj-$(CONFIG_AD5761) += ad5761.o obj-$(CONFIG_AD5764) += ad5764.o obj-$(CONFIG_AD5791) += ad5791.o obj-$(CONFIG_AD5686) += ad5686.o diff --git a/drivers/iio/dac/ad5761.c b/drivers/iio/dac/ad5761.c new file mode 100644 index 000000000000..d6510d6928b3 --- /dev/null +++ b/drivers/iio/dac/ad5761.c @@ -0,0 +1,430 @@ +/* + * AD5721, AD5721R, AD5761, AD5761R, Voltage Output Digital to Analog Converter + * + * Copyright 2016 Qtechnology A/S + * 2016 Ricardo Ribalda <ricardo.ribalda@gmail.com> + * + * Licensed under the GPL-2. + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/spi/spi.h> +#include <linux/bitops.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/regulator/consumer.h> +#include <linux/platform_data/ad5761.h> + +#define AD5761_ADDR(addr) ((addr & 0xf) << 16) +#define AD5761_ADDR_NOOP 0x0 +#define AD5761_ADDR_DAC_WRITE 0x3 +#define AD5761_ADDR_CTRL_WRITE_REG 0x4 +#define AD5761_ADDR_SW_DATA_RESET 0x7 +#define AD5761_ADDR_DAC_READ 0xb +#define AD5761_ADDR_CTRL_READ_REG 0xc +#define AD5761_ADDR_SW_FULL_RESET 0xf + +#define AD5761_CTRL_USE_INTVREF BIT(5) +#define AD5761_CTRL_ETS BIT(6) + +/** + * struct ad5761_chip_info - chip specific information + * @int_vref: Value of the internal reference voltage in mV - 0 if external + * reference voltage is used + * @channel: channel specification +*/ + +struct ad5761_chip_info { + unsigned long int_vref; + const struct iio_chan_spec channel; +}; + +struct ad5761_range_params { + int m; + int c; +}; + +enum ad5761_supported_device_ids { + ID_AD5721, + ID_AD5721R, + ID_AD5761, + ID_AD5761R, +}; + +/** + * struct ad5761_state - driver instance specific data + * @spi: spi_device + * @vref_reg: reference voltage regulator + * @use_intref: true when the internal voltage reference is used + * @vref: actual voltage reference in mVolts + * @range: output range mode used + * @data: cache aligned spi buffer + */ +struct ad5761_state { + struct spi_device *spi; + struct regulator *vref_reg; + + bool use_intref; + int vref; + enum ad5761_voltage_range range; + + /* + * DMA (thus cache coherency maintenance) requires the + * transfer buffers to live in their own cache lines. + */ + union { + __be32 d32; + u8 d8[4]; + } data[3] ____cacheline_aligned; +}; + +static const struct ad5761_range_params ad5761_range_params[] = { + [AD5761_VOLTAGE_RANGE_M10V_10V] = { + .m = 80, + .c = 40, + }, + [AD5761_VOLTAGE_RANGE_0V_10V] = { + .m = 40, + .c = 0, + }, + [AD5761_VOLTAGE_RANGE_M5V_5V] = { + .m = 40, + .c = 20, + }, + [AD5761_VOLTAGE_RANGE_0V_5V] = { + .m = 20, + .c = 0, + }, + [AD5761_VOLTAGE_RANGE_M2V5_7V5] = { + .m = 40, + .c = 10, + }, + [AD5761_VOLTAGE_RANGE_M3V_3V] = { + .m = 24, + .c = 12, + }, + [AD5761_VOLTAGE_RANGE_0V_16V] = { + .m = 64, + .c = 0, + }, + [AD5761_VOLTAGE_RANGE_0V_20V] = { + .m = 80, + .c = 0, + }, +}; + +static int _ad5761_spi_write(struct ad5761_state *st, u8 addr, u16 val) +{ + st->data[0].d32 = cpu_to_be32(AD5761_ADDR(addr) | val); + + return spi_write(st->spi, &st->data[0].d8[1], 3); +} + +static int ad5761_spi_write(struct iio_dev *indio_dev, u8 addr, u16 val) +{ + struct ad5761_state *st = iio_priv(indio_dev); + int ret; + + mutex_lock(&indio_dev->mlock); + ret = _ad5761_spi_write(st, addr, val); + mutex_unlock(&indio_dev->mlock); + + return ret; +} + +static int _ad5761_spi_read(struct ad5761_state *st, u8 addr, u16 *val) +{ + int ret; + struct spi_transfer xfers[] = { + { + .tx_buf = &st->data[0].d8[1], + .bits_per_word = 8, + .len = 3, + .cs_change = true, + }, { + .tx_buf = &st->data[1].d8[1], + .rx_buf = &st->data[2].d8[1], + .bits_per_word = 8, + .len = 3, + }, + }; + + st->data[0].d32 = cpu_to_be32(AD5761_ADDR(addr)); + st->data[1].d32 = cpu_to_be32(AD5761_ADDR(AD5761_ADDR_NOOP)); + + ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers)); + + *val = be32_to_cpu(st->data[2].d32); + + return ret; +} + +static int ad5761_spi_read(struct iio_dev *indio_dev, u8 addr, u16 *val) +{ + struct ad5761_state *st = iio_priv(indio_dev); + int ret; + + mutex_lock(&indio_dev->mlock); + ret = _ad5761_spi_read(st, addr, val); + mutex_unlock(&indio_dev->mlock); + + return ret; +} + +static int ad5761_spi_set_range(struct ad5761_state *st, + enum ad5761_voltage_range range) +{ + u16 aux; + int ret; + + aux = (range & 0x7) | AD5761_CTRL_ETS; + + if (st->use_intref) + aux |= AD5761_CTRL_USE_INTVREF; + + ret = _ad5761_spi_write(st, AD5761_ADDR_SW_FULL_RESET, 0); + if (ret) + return ret; + + ret = _ad5761_spi_write(st, AD5761_ADDR_CTRL_WRITE_REG, aux); + if (ret) + return ret; + + st->range = range; + + return 0; +} + +static int ad5761_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long mask) +{ + struct ad5761_state *st; + int ret; + u16 aux; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = ad5761_spi_read(indio_dev, AD5761_ADDR_DAC_READ, &aux); + if (ret) + return ret; + *val = aux >> chan->scan_type.shift; + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + st = iio_priv(indio_dev); + *val = st->vref * ad5761_range_params[st->range].m; + *val /= 10; + *val2 = chan->scan_type.realbits; + return IIO_VAL_FRACTIONAL_LOG2; + case IIO_CHAN_INFO_OFFSET: + st = iio_priv(indio_dev); + *val = -(1 << chan->scan_type.realbits); + *val *= ad5761_range_params[st->range].c; + *val /= ad5761_range_params[st->range].m; + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static int ad5761_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long mask) +{ + u16 aux; + + if (mask != IIO_CHAN_INFO_RAW) + return -EINVAL; + + if (val2 || (val << chan->scan_type.shift) > 0xffff || val < 0) + return -EINVAL; + + aux = val << chan->scan_type.shift; + + return ad5761_spi_write(indio_dev, AD5761_ADDR_DAC_WRITE, aux); +} + +static const struct iio_info ad5761_info = { + .read_raw = &ad5761_read_raw, + .write_raw = &ad5761_write_raw, + .driver_module = THIS_MODULE, +}; + +#define AD5761_CHAN(_bits) { \ + .type = IIO_VOLTAGE, \ + .output = 1, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_OFFSET), \ + .scan_type = { \ + .sign = 'u', \ + .realbits = (_bits), \ + .storagebits = 16, \ + .shift = 16 - (_bits), \ + }, \ +} + +static const struct ad5761_chip_info ad5761_chip_infos[] = { + [ID_AD5721] = { + .int_vref = 0, + .channel = AD5761_CHAN(12), + }, + [ID_AD5721R] = { + .int_vref = 2500, + .channel = AD5761_CHAN(12), + }, + [ID_AD5761] = { + .int_vref = 0, + .channel = AD5761_CHAN(16), + }, + [ID_AD5761R] = { + .int_vref = 2500, + .channel = AD5761_CHAN(16), + }, +}; + +static int ad5761_get_vref(struct ad5761_state *st, + const struct ad5761_chip_info *chip_info) +{ + int ret; + + st->vref_reg = devm_regulator_get_optional(&st->spi->dev, "vref"); + if (PTR_ERR(st->vref_reg) == -ENODEV) { + /* Use Internal regulator */ + if (!chip_info->int_vref) { + dev_err(&st->spi->dev, + "Voltage reference not found\n"); + return -EIO; + } + + st->use_intref = true; + st->vref = chip_info->int_vref; + return 0; + } + + if (IS_ERR(st->vref_reg)) { + dev_err(&st->spi->dev, + "Error getting voltage reference regulator\n"); + return PTR_ERR(st->vref_reg); + } + + ret = regulator_enable(st->vref_reg); + if (ret) { + dev_err(&st->spi->dev, + "Failed to enable voltage reference\n"); + return ret; + } + + ret = regulator_get_voltage(st->vref_reg); + if (ret < 0) { + dev_err(&st->spi->dev, + "Failed to get voltage reference value\n"); + goto disable_regulator_vref; + } + + if (ret < 2000000 || ret > 3000000) { + dev_warn(&st->spi->dev, + "Invalid external voltage ref. value %d uV\n", ret); + ret = -EIO; + goto disable_regulator_vref; + } + + st->vref = ret / 1000; + st->use_intref = false; + + return 0; + +disable_regulator_vref: + regulator_disable(st->vref_reg); + st->vref_reg = NULL; + return ret; +} + +static int ad5761_probe(struct spi_device *spi) +{ + struct iio_dev *iio_dev; + struct ad5761_state *st; + int ret; + const struct ad5761_chip_info *chip_info = + &ad5761_chip_infos[spi_get_device_id(spi)->driver_data]; + enum ad5761_voltage_range voltage_range = AD5761_VOLTAGE_RANGE_0V_5V; + struct ad5761_platform_data *pdata = dev_get_platdata(&spi->dev); + + iio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); + if (!iio_dev) + return -ENOMEM; + + st = iio_priv(iio_dev); + + st->spi = spi; + spi_set_drvdata(spi, iio_dev); + + ret = ad5761_get_vref(st, chip_info); + if (ret) + return ret; + + if (pdata) + voltage_range = pdata->voltage_range; + + ret = ad5761_spi_set_range(st, voltage_range); + if (ret) + goto disable_regulator_err; + + iio_dev->dev.parent = &spi->dev; + iio_dev->info = &ad5761_info; + iio_dev->modes = INDIO_DIRECT_MODE; + iio_dev->channels = &chip_info->channel; + iio_dev->num_channels = 1; + iio_dev->name = spi_get_device_id(st->spi)->name; + ret = iio_device_register(iio_dev); + if (ret) + goto disable_regulator_err; + + return 0; + +disable_regulator_err: + if (!IS_ERR_OR_NULL(st->vref_reg)) + regulator_disable(st->vref_reg); + + return ret; +} + +static int ad5761_remove(struct spi_device *spi) +{ + struct iio_dev *iio_dev = spi_get_drvdata(spi); + struct ad5761_state *st = iio_priv(iio_dev); + + iio_device_unregister(iio_dev); + + if (!IS_ERR_OR_NULL(st->vref_reg)) + regulator_disable(st->vref_reg); + + return 0; +} + +static const struct spi_device_id ad5761_id[] = { + {"ad5721", ID_AD5721}, + {"ad5721r", ID_AD5721R}, + {"ad5761", ID_AD5761}, + {"ad5761r", ID_AD5761R}, + {} +}; +MODULE_DEVICE_TABLE(spi, ad5761_id); + +static struct spi_driver ad5761_driver = { + .driver = { + .name = "ad5761", + }, + .probe = ad5761_probe, + .remove = ad5761_remove, + .id_table = ad5761_id, +}; +module_spi_driver(ad5761_driver); + +MODULE_AUTHOR("Ricardo Ribalda <ricardo.ribalda@gmail.com>"); +MODULE_DESCRIPTION("Analog Devices AD5721, AD5721R, AD5761, AD5761R driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/dac/mcp4725.c b/drivers/iio/dac/mcp4725.c index b4dde8315210..cca935c06f2b 100644 --- a/drivers/iio/dac/mcp4725.c +++ b/drivers/iio/dac/mcp4725.c @@ -1,5 +1,5 @@ /* - * mcp4725.c - Support for Microchip MCP4725 + * mcp4725.c - Support for Microchip MCP4725/6 * * Copyright (C) 2012 Peter Meerwald <pmeerw@pmeerw.net> * @@ -134,6 +134,12 @@ static const char * const mcp4725_powerdown_modes[] = { "500kohm_to_gnd" }; +static const char * const mcp4726_powerdown_modes[] = { + "1kohm_to_gnd", + "125kohm_to_gnd", + "640kohm_to_gnd" +}; + static int mcp4725_get_powerdown_mode(struct iio_dev *indio_dev, const struct iio_chan_spec *chan) { @@ -182,11 +188,24 @@ static ssize_t mcp4725_write_powerdown(struct iio_dev *indio_dev, return len; } -static const struct iio_enum mcp4725_powerdown_mode_enum = { - .items = mcp4725_powerdown_modes, - .num_items = ARRAY_SIZE(mcp4725_powerdown_modes), - .get = mcp4725_get_powerdown_mode, - .set = mcp4725_set_powerdown_mode, +enum { + MCP4725, + MCP4726, +}; + +static const struct iio_enum mcp472x_powerdown_mode_enum[] = { + [MCP4725] = { + .items = mcp4725_powerdown_modes, + .num_items = ARRAY_SIZE(mcp4725_powerdown_modes), + .get = mcp4725_get_powerdown_mode, + .set = mcp4725_set_powerdown_mode, + }, + [MCP4726] = { + .items = mcp4726_powerdown_modes, + .num_items = ARRAY_SIZE(mcp4726_powerdown_modes), + .get = mcp4725_get_powerdown_mode, + .set = mcp4725_set_powerdown_mode, + }, }; static const struct iio_chan_spec_ext_info mcp4725_ext_info[] = { @@ -196,19 +215,46 @@ static const struct iio_chan_spec_ext_info mcp4725_ext_info[] = { .write = mcp4725_write_powerdown, .shared = IIO_SEPARATE, }, - IIO_ENUM("powerdown_mode", IIO_SEPARATE, &mcp4725_powerdown_mode_enum), - IIO_ENUM_AVAILABLE("powerdown_mode", &mcp4725_powerdown_mode_enum), + IIO_ENUM("powerdown_mode", IIO_SEPARATE, + &mcp472x_powerdown_mode_enum[MCP4725]), + IIO_ENUM_AVAILABLE("powerdown_mode", + &mcp472x_powerdown_mode_enum[MCP4725]), + { }, +}; + +static const struct iio_chan_spec_ext_info mcp4726_ext_info[] = { + { + .name = "powerdown", + .read = mcp4725_read_powerdown, + .write = mcp4725_write_powerdown, + .shared = IIO_SEPARATE, + }, + IIO_ENUM("powerdown_mode", IIO_SEPARATE, + &mcp472x_powerdown_mode_enum[MCP4726]), + IIO_ENUM_AVAILABLE("powerdown_mode", + &mcp472x_powerdown_mode_enum[MCP4726]), { }, }; -static const struct iio_chan_spec mcp4725_channel = { - .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), - .ext_info = mcp4725_ext_info, +static const struct iio_chan_spec mcp472x_channel[] = { + [MCP4725] = { + .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), + .ext_info = mcp4725_ext_info, + }, + [MCP4726] = { + .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), + .ext_info = mcp4726_ext_info, + }, }; static int mcp4725_set_value(struct iio_dev *indio_dev, int val) @@ -302,7 +348,7 @@ static int mcp4725_probe(struct i2c_client *client, indio_dev->dev.parent = &client->dev; indio_dev->name = id->name; indio_dev->info = &mcp4725_info; - indio_dev->channels = &mcp4725_channel; + indio_dev->channels = &mcp472x_channel[id->driver_data]; indio_dev->num_channels = 1; indio_dev->modes = INDIO_DIRECT_MODE; @@ -316,7 +362,7 @@ static int mcp4725_probe(struct i2c_client *client, } pd = (inbuf[0] >> 1) & 0x3; data->powerdown = pd > 0 ? true : false; - data->powerdown_mode = pd ? pd-1 : 2; /* 500kohm_to_gnd */ + data->powerdown_mode = pd ? pd - 1 : 2; /* largest register to gnd */ data->dac_value = (inbuf[1] << 4) | (inbuf[2] >> 4); return iio_device_register(indio_dev); @@ -329,7 +375,8 @@ static int mcp4725_remove(struct i2c_client *client) } static const struct i2c_device_id mcp4725_id[] = { - { "mcp4725", 0 }, + { "mcp4725", MCP4725 }, + { "mcp4726", MCP4726 }, { } }; MODULE_DEVICE_TABLE(i2c, mcp4725_id); @@ -346,5 +393,5 @@ static struct i2c_driver mcp4725_driver = { module_i2c_driver(mcp4725_driver); MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); -MODULE_DESCRIPTION("MCP4725 12-bit DAC"); +MODULE_DESCRIPTION("MCP4725/6 12-bit DAC"); MODULE_LICENSE("GPL"); |