This patch adds support for ADC128S052 from TI. Signed-off-by: Angelo Compagnucci <angelo.compagnucci@xxxxxxxxx> --- drivers/iio/adc/Kconfig | 10 +++ drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ti-adc128s052.c | 185 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 196 insertions(+) create mode 100644 drivers/iio/adc/ti-adc128s052.c diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 11b048a..9dbab93 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -216,6 +216,16 @@ config TI_ADC081C This driver can also be built as a module. If so, the module will be called ti-adc081c. +config TI_ADC128S052 + tristate "Texas Instruments ADC128S052" + depends on I2C + help + If you say yes here you get support for Texas Instruments ADC128S052 + chip. + + This driver can also be built as a module. If so, the module will be + called ti-adc128s052. + config TI_AM335X_ADC tristate "TI's AM335X ADC driver" depends on MFD_TI_AM335X_TSCADC diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index ad81b51..9cc37f6 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -23,6 +23,7 @@ obj-$(CONFIG_MCP3422) += mcp3422.o obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o obj-$(CONFIG_NAU7802) += nau7802.o obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o +obj-$(CONFIG_TI_ADC128S052) += ti-adc128s052.o obj-$(CONFIG_TI_AM335X_ADC) += ti_am335x_adc.o obj-$(CONFIG_TWL4030_MADC) += twl4030-madc.o obj-$(CONFIG_TWL6030_GPADC) += twl6030-gpadc.o diff --git a/drivers/iio/adc/ti-adc128s052.c b/drivers/iio/adc/ti-adc128s052.c new file mode 100644 index 0000000..b7c34f4 --- /dev/null +++ b/drivers/iio/adc/ti-adc128s052.c @@ -0,0 +1,185 @@ +/* + * Copyright (C) 2014 Angelo Compagnucci <angelo.compagnucci@xxxxxxxxx> + * + * Driver for Texas Instruments' ADC128S052 ADC chip. + * Datasheet can be found here: + * http://www.ti.com/lit/ds/symlink/adc128s052.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/err.h> +#include <linux/spi/spi.h> +#include <linux/module.h> +#include <linux/iio/iio.h> +#include <linux/regulator/consumer.h> + +struct adc128 { + struct spi_device *spi; + struct spi_message msg; + struct spi_transfer transfer[2]; + + u8 tx_buf; + u8 rx_buf[2]; + + struct regulator *reg; + struct mutex lock; +}; + +static int adc128_adc_conversion(struct adc128 *adc, u8 channel) +{ + int ret; + + adc->tx_buf = channel << 3; + ret = spi_sync(adc->spi, &adc->msg); + if (ret < 0) + return ret; + + return ((adc->rx_buf[0] << 8 | adc->rx_buf[1]) & 0xFFF); +} + +static int adc128_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *channel, int *val, + int *val2, long mask) +{ + struct adc128 *adc = iio_priv(indio_dev); + int ret = -EINVAL; + + mutex_lock(&adc->lock); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + + ret = adc128_adc_conversion(adc, channel->channel); + + if (ret < 0) + goto out; + + *val = ret; + ret = IIO_VAL_INT; + break; + + case IIO_CHAN_INFO_SCALE: + /* Digital output code = (4096 * Vin) / Vref */ + ret = regulator_get_voltage(adc->reg); + if (ret < 0) + goto out; + + *val = ret / 1000; + *val2 = 12; + ret = IIO_VAL_FRACTIONAL_LOG2; + break; + + default: + break; + } + +out: + mutex_unlock(&adc->lock); + + return ret; +} + +#define ADC128_VOLTAGE_CHANNEL(num) \ + { \ + .type = IIO_VOLTAGE, \ + .indexed = 1, \ + .channel = (num), \ + .address = (num), \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) \ + } + +static const struct iio_chan_spec adc128_channels[] = { + ADC128_VOLTAGE_CHANNEL(0), + ADC128_VOLTAGE_CHANNEL(1), + ADC128_VOLTAGE_CHANNEL(2), + ADC128_VOLTAGE_CHANNEL(3), + ADC128_VOLTAGE_CHANNEL(4), + ADC128_VOLTAGE_CHANNEL(5), + ADC128_VOLTAGE_CHANNEL(6), + ADC128_VOLTAGE_CHANNEL(7), +}; + +static const struct iio_info adc128_info = { + .read_raw = adc128_read_raw, + .driver_module = THIS_MODULE, +}; + +static int adc128_probe(struct spi_device *spi) +{ + struct iio_dev *indio_dev; + struct adc128 *adc; + int ret; + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc)); + if (!indio_dev) + return -ENOMEM; + + adc = iio_priv(indio_dev); + adc->spi = spi; + + indio_dev->dev.parent = &spi->dev; + indio_dev->name = spi_get_device_id(spi)->name; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = &adc128_info; + + indio_dev->channels = adc128_channels; + indio_dev->num_channels = ARRAY_SIZE(adc128_channels); + + adc->transfer[0].tx_buf = &adc->tx_buf; + adc->transfer[0].len = sizeof(adc->tx_buf); + adc->transfer[1].rx_buf = adc->rx_buf; + adc->transfer[1].len = sizeof(adc->rx_buf); + + spi_message_init_with_transfers(&adc->msg, adc->transfer, + ARRAY_SIZE(adc->transfer)); + + adc->reg = devm_regulator_get(&spi->dev, "vref"); + if (IS_ERR(adc->reg)) + return PTR_ERR(adc->reg); + + ret = regulator_enable(adc->reg); + if (ret < 0) + return ret; + + mutex_init(&adc->lock); + + ret = iio_device_register(indio_dev); + + return ret; +} + +static int adc128_remove(struct spi_device *spi) +{ + struct iio_dev *indio_dev = spi_get_drvdata(spi); + struct adc128 *adc = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + regulator_disable(adc->reg); + + return 0; +} + +static const struct spi_device_id adc128_id[] = { + { "adc128s052", 1 }, + { } +}; +MODULE_DEVICE_TABLE(spi, adc128_id); + +static struct spi_driver adc128_driver = { + .driver = { + .name = "adc128s052", + .owner = THIS_MODULE, + }, + .probe = adc128_probe, + .remove = adc128_remove, + .id_table = adc128_id, +}; +module_spi_driver(adc128_driver); + +MODULE_AUTHOR("Angelo Compagnucci <angelo.compagnucci@xxxxxxxxx>"); +MODULE_DESCRIPTION("Texas Instruments ADC128S052"); +MODULE_LICENSE("GPL v2"); -- 2.0.3 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
