From: Mårten Lindahl <martenli@xxxxxxxx> This adds support for the Texas Instruments ADC084S021 ADC chip. Signed-off-by: Mårten Lindahl <martenli@xxxxxxxx> --- Changes in v2: - Removed most #defines in favor of inlines - Corrected channel macro - Removed configuration array with only one item - Updated func adc084s021_adc_conversion to use be16_to_cpu - Added IIO_CHAN_INFO_SCALE to func adc084s021_read_raw - Use iio_device_claim_direct_mode in func adc084s021_read_raw - Removed documentation for standard driver functions - Changed retval to ret everywhere - Removed dynamic alloc for data buffer in trigger handler - Keeping mutex for all iterations in trigger handler - Removed usage of events in this driver - Removed info log in probe - Use spi_message_init_with_transfers for spi message structs - Use preenable and postdisable functions for regulator - Inserted blank line before last return in all functions drivers/iio/adc/Kconfig | 12 ++ drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ti-adc084s021.c | 294 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 307 insertions(+) create mode 100644 drivers/iio/adc/ti-adc084s021.c diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index dedae7a..13141e5 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -560,6 +560,18 @@ config TI_ADC0832 This driver can also be built as a module. If so, the module will be called ti-adc0832. +config TI_ADC084S021 + tristate "Texas Instruments ADC084S021" + depends on SPI + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER + help + If you say yes here you get support for Texas Instruments ADC084S021 + chips. + + This driver can also be built as a module. If so, the module will be + called ti-adc084s021. + config TI_ADC12138 tristate "Texas Instruments ADC12130/ADC12132/ADC12138" depends on SPI diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index d001262..b1a6158 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -51,6 +51,7 @@ obj-$(CONFIG_STM32_ADC_CORE) += stm32-adc-core.o obj-$(CONFIG_STM32_ADC) += stm32-adc.o obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o obj-$(CONFIG_TI_ADC0832) += ti-adc0832.o +obj-$(CONFIG_TI_ADC084S021) += ti-adc084s021.o obj-$(CONFIG_TI_ADC12138) += ti-adc12138.o obj-$(CONFIG_TI_ADC128S052) += ti-adc128s052.o obj-$(CONFIG_TI_ADC161S626) += ti-adc161s626.o diff --git a/drivers/iio/adc/ti-adc084s021.c b/drivers/iio/adc/ti-adc084s021.c new file mode 100644 index 0000000..2dce257 --- /dev/null +++ b/drivers/iio/adc/ti-adc084s021.c @@ -0,0 +1,294 @@ +/** + * Copyright (C) 2017 Axis Communications AB + * + * Driver for Texas Instruments' ADC084S021 ADC chip. + * Datasheets can be found here: + * http://www.ti.com/lit/ds/symlink/adc084s021.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/interrupt.h> +#include <linux/iio/iio.h> +#include <linux/iio/buffer.h> +#include <linux/iio/triggered_buffer.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/regulator/consumer.h> + +#define ADC084S021_DRIVER_NAME "adc084s021" + +struct adc084s021 { + struct spi_device *spi; + struct spi_message message; + struct spi_transfer spi_trans[2]; + struct regulator *reg; + struct mutex lock; + /* + * DMA (thus cache coherency maintenance) requires the + * transfer buffers to live in their own cache lines. + */ + union { + u16 tx_buf; + __be16 rx_buf; + } ____cacheline_aligned; +}; + +/** + * Channel specification + */ +#define ADC084S021_VOLTAGE_CHANNEL(num) \ + { \ + .type = IIO_VOLTAGE, \ + .channel = (num), \ + .address = (num) << 3, \ + .indexed = 1, \ + .scan_index = (num), \ + .scan_type = { \ + .sign = 'u', \ + .realbits = 8, \ + .storagebits = 16, \ + .shift = 4, \ + .endianness = IIO_BE, \ + }, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\ + } + +static const struct iio_chan_spec adc084s021_channels[] = { + ADC084S021_VOLTAGE_CHANNEL(0), + ADC084S021_VOLTAGE_CHANNEL(1), + ADC084S021_VOLTAGE_CHANNEL(2), + ADC084S021_VOLTAGE_CHANNEL(3), + IIO_CHAN_SOFT_TIMESTAMP(4), +}; + +/** + * Read an ADC channel and return its value. + * + * @adc: The ADC SPI data. + * @channel: The IIO channel data structure. + */ +static int adc084s021_adc_conversion(struct adc084s021 *adc, + struct iio_chan_spec const *channel) +{ + u8 value; + int ret; + + adc->tx_buf = channel->address; + + /* Do the transfer */ + ret = spi_sync(adc->spi, &adc->message); + if (ret < 0) + return ret; + + value = (be16_to_cpu(adc->rx_buf) >> channel->scan_type.shift) & 0xff; + + dev_dbg(&adc->spi->dev, "value 0x%02X on channel %d\n", + value, channel->channel); + + return value; +} + +static int adc084s021_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *channel, int *val, + int *val2, long mask) +{ + struct adc084s021 *adc = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = iio_device_claim_direct_mode(indio_dev); + if (ret < 0) + return ret; + + ret = adc084s021_adc_conversion(adc, channel); + iio_device_release_direct_mode(indio_dev); + if (ret < 0) + return ret; + + *val = ret; + + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + ret = regulator_get_voltage(adc->reg); + if (ret < 0) + return ret; + + *val = ret / 1000; + + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +/** + * Read enabled ADC channels and push data to the buffer. + * + * @irq: The interrupt number (not used). + * @pollfunc: Pointer to the poll func. + */ +static irqreturn_t adc084s021_buffer_trigger_handler(int irq, void *pollfunc) +{ + struct iio_poll_func *pf = pollfunc; + struct iio_dev *indio_dev = pf->indio_dev; + struct adc084s021 *adc = iio_priv(indio_dev); + __be16 data[8] = {0}; /* 4 * 16-bit words of data + 8 bytes timestamp */ + int scan_index; + int i = 0; + + mutex_lock(&adc->lock); + + for_each_set_bit(scan_index, indio_dev->active_scan_mask, + indio_dev->masklength) { + const struct iio_chan_spec *channel = + &indio_dev->channels[scan_index]; + data[i++] = adc084s021_adc_conversion(adc, channel); + } + + iio_push_to_buffers_with_timestamp(indio_dev, data, + iio_get_time_ns(indio_dev)); + mutex_unlock(&adc->lock); + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +static int adc084s021_buffer_preenable(struct iio_dev *indio_dev) +{ + struct adc084s021 *adc = iio_priv(indio_dev); + + return regulator_enable(adc->reg); +} + +static int adc084s021_buffer_postdisable(struct iio_dev *indio_dev) +{ + struct adc084s021 *adc = iio_priv(indio_dev); + + return regulator_disable(adc->reg); +} + +static const struct iio_info adc084s021_info = { + .read_raw = adc084s021_read_raw, + .driver_module = THIS_MODULE, +}; + +static const struct iio_buffer_setup_ops adc084s021_buffer_setup_ops = { + .preenable = adc084s021_buffer_preenable, + .postenable = iio_triggered_buffer_postenable, + .predisable = iio_triggered_buffer_predisable, + .postdisable = adc084s021_buffer_postdisable, +}; + +static int adc084s021_probe(struct spi_device *spi) +{ + struct iio_dev *indio_dev; + struct adc084s021 *adc; + int ret; + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc)); + if (!indio_dev) { + dev_err(&spi->dev, "Failed to allocate IIO device\n"); + return -ENOMEM; + } + + adc = iio_priv(indio_dev); + adc->spi = spi; + spi->bits_per_word = 8; + + /* Update the SPI device with config and connect the iio dev */ + ret = spi_setup(spi); + if (ret) { + dev_err(&spi->dev, "Failed to update SPI device\n"); + return ret; + } + spi_set_drvdata(spi, indio_dev); + + /* Initiate the Industrial I/O device */ + indio_dev->dev.parent = &spi->dev; + indio_dev->dev.of_node = spi->dev.of_node; + indio_dev->name = spi_get_device_id(spi)->name; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = &adc084s021_info; + indio_dev->channels = adc084s021_channels; + indio_dev->num_channels = ARRAY_SIZE(adc084s021_channels); + + /* Create SPI transfer for channel reads */ + adc->spi_trans[0].tx_buf = &adc->tx_buf; + adc->spi_trans[0].len = 2; + adc->spi_trans[0].speed_hz = spi->max_speed_hz; + adc->spi_trans[0].bits_per_word = spi->bits_per_word; + adc->spi_trans[1].rx_buf = &adc->rx_buf; + adc->spi_trans[1].len = 2; + adc->spi_trans[1].speed_hz = spi->max_speed_hz; + adc->spi_trans[1].bits_per_word = spi->bits_per_word; + + spi_message_init_with_transfers(&adc->message, adc->spi_trans, 2); + + adc->reg = devm_regulator_get(&spi->dev, "vref"); + if (IS_ERR(adc->reg)) + return PTR_ERR(adc->reg); + + mutex_init(&adc->lock); + + /* Setup triggered buffer with pollfunction */ + ret = iio_triggered_buffer_setup(indio_dev, NULL, + adc084s021_buffer_trigger_handler, + &adc084s021_buffer_setup_ops); + if (ret) { + dev_err(&spi->dev, "Failed to setup triggered buffer\n"); + return ret; + } + + ret = iio_device_register(indio_dev); + if (ret) { + dev_err(&spi->dev, "Failed to register IIO device\n"); + iio_triggered_buffer_cleanup(indio_dev); + } + + return ret; +} + +static int adc084s021_remove(struct spi_device *spi) +{ + struct iio_dev *indio_dev = spi_get_drvdata(spi); + + iio_device_unregister(indio_dev); + iio_triggered_buffer_cleanup(indio_dev); + + return 0; +} + +static const struct of_device_id adc084s021_of_match[] = { + { .compatible = "ti,adc084s021", }, + {}, +}; +MODULE_DEVICE_TABLE(of, adc084s021_of_match); + +static const struct spi_device_id adc084s021_id[] = { + { ADC084S021_DRIVER_NAME, 0}, + {} +}; +MODULE_DEVICE_TABLE(spi, adc084s021_id); + +static struct spi_driver adc084s021_driver = { + .driver = { + .name = ADC084S021_DRIVER_NAME, + .of_match_table = of_match_ptr(adc084s021_of_match), + }, + .probe = adc084s021_probe, + .remove = adc084s021_remove, + .id_table = adc084s021_id, +}; +module_spi_driver(adc084s021_driver); + +MODULE_AUTHOR("Mårten Lindahl <martenli@xxxxxxxx>"); +MODULE_DESCRIPTION("Texas Instruments ADC084S021"); +MODULE_LICENSE("GPL v2"); +MODULE_VERSION("1.0"); -- 2.1.4 -- 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
