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Diffstat (limited to 'drivers/staging/iio/adc/ad7298_core.c')
-rw-r--r--drivers/staging/iio/adc/ad7298_core.c289
1 files changed, 0 insertions, 289 deletions
diff --git a/drivers/staging/iio/adc/ad7298_core.c b/drivers/staging/iio/adc/ad7298_core.c
deleted file mode 100644
index 4c75114e7d7c..000000000000
--- a/drivers/staging/iio/adc/ad7298_core.c
+++ /dev/null
@@ -1,289 +0,0 @@
-/*
- * AD7298 SPI ADC driver
- *
- * Copyright 2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- */
-
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/sysfs.h>
-#include <linux/spi/spi.h>
-#include <linux/regulator/consumer.h>
-#include <linux/err.h>
-#include <linux/delay.h>
-#include <linux/module.h>
-
-#include <linux/iio/iio.h>
-#include <linux/iio/sysfs.h>
-#include <linux/iio/buffer.h>
-
-#include "ad7298.h"
-
-#define AD7298_V_CHAN(index) \
- { \
- .type = IIO_VOLTAGE, \
- .indexed = 1, \
- .channel = index, \
- .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
- IIO_CHAN_INFO_SCALE_SHARED_BIT, \
- .address = index, \
- .scan_index = index, \
- .scan_type = { \
- .sign = 'u', \
- .realbits = 12, \
- .storagebits = 16, \
- }, \
- }
-
-static const struct iio_chan_spec ad7298_channels[] = {
- {
- .type = IIO_TEMP,
- .indexed = 1,
- .channel = 0,
- .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
- IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
- .address = AD7298_CH_TEMP,
- .scan_index = -1,
- .scan_type = {
- .sign = 's',
- .realbits = 32,
- .storagebits = 32,
- },
- },
- AD7298_V_CHAN(0),
- AD7298_V_CHAN(1),
- AD7298_V_CHAN(2),
- AD7298_V_CHAN(3),
- AD7298_V_CHAN(4),
- AD7298_V_CHAN(5),
- AD7298_V_CHAN(6),
- AD7298_V_CHAN(7),
- IIO_CHAN_SOFT_TIMESTAMP(8),
-};
-
-static int ad7298_scan_direct(struct ad7298_state *st, unsigned ch)
-{
- int ret;
- st->tx_buf[0] = cpu_to_be16(AD7298_WRITE | st->ext_ref |
- (AD7298_CH(0) >> ch));
-
- ret = spi_sync(st->spi, &st->scan_single_msg);
- if (ret)
- return ret;
-
- return be16_to_cpu(st->rx_buf[0]);
-}
-
-static int ad7298_scan_temp(struct ad7298_state *st, int *val)
-{
- int tmp, ret;
- __be16 buf;
-
- buf = cpu_to_be16(AD7298_WRITE | AD7298_TSENSE |
- AD7298_TAVG | st->ext_ref);
-
- ret = spi_write(st->spi, (u8 *)&buf, 2);
- if (ret)
- return ret;
-
- buf = cpu_to_be16(0);
-
- ret = spi_write(st->spi, (u8 *)&buf, 2);
- if (ret)
- return ret;
-
- usleep_range(101, 1000); /* sleep > 100us */
-
- ret = spi_read(st->spi, (u8 *)&buf, 2);
- if (ret)
- return ret;
-
- tmp = be16_to_cpu(buf) & RES_MASK(AD7298_BITS);
-
- /*
- * One LSB of the ADC corresponds to 0.25 deg C.
- * The temperature reading is in 12-bit twos complement format
- */
-
- if (tmp & (1 << (AD7298_BITS - 1))) {
- tmp = (4096 - tmp) * 250;
- tmp -= (2 * tmp);
-
- } else {
- tmp *= 250; /* temperature in milli degrees Celsius */
- }
-
- *val = tmp;
-
- return 0;
-}
-
-static int ad7298_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val,
- int *val2,
- long m)
-{
- int ret;
- struct ad7298_state *st = iio_priv(indio_dev);
- unsigned int scale_uv;
-
- switch (m) {
- case IIO_CHAN_INFO_RAW:
- mutex_lock(&indio_dev->mlock);
- if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
- ret = -EBUSY;
- } else {
- if (chan->address == AD7298_CH_TEMP)
- ret = ad7298_scan_temp(st, val);
- else
- ret = ad7298_scan_direct(st, chan->address);
- }
- mutex_unlock(&indio_dev->mlock);
-
- if (ret < 0)
- return ret;
-
- if (chan->address != AD7298_CH_TEMP)
- *val = ret & RES_MASK(AD7298_BITS);
-
- return IIO_VAL_INT;
- case IIO_CHAN_INFO_SCALE:
- switch (chan->type) {
- case IIO_VOLTAGE:
- scale_uv = (st->int_vref_mv * 1000) >> AD7298_BITS;
- *val = scale_uv / 1000;
- *val2 = (scale_uv % 1000) * 1000;
- return IIO_VAL_INT_PLUS_MICRO;
- case IIO_TEMP:
- *val = 1;
- *val2 = 0;
- return IIO_VAL_INT_PLUS_MICRO;
- default:
- return -EINVAL;
- }
- }
- return -EINVAL;
-}
-
-static const struct iio_info ad7298_info = {
- .read_raw = &ad7298_read_raw,
- .update_scan_mode = ad7298_update_scan_mode,
- .driver_module = THIS_MODULE,
-};
-
-static int __devinit ad7298_probe(struct spi_device *spi)
-{
- struct ad7298_platform_data *pdata = spi->dev.platform_data;
- struct ad7298_state *st;
- int ret;
- struct iio_dev *indio_dev = iio_device_alloc(sizeof(*st));
-
- if (indio_dev == NULL)
- return -ENOMEM;
-
- st = iio_priv(indio_dev);
-
- st->reg = regulator_get(&spi->dev, "vcc");
- if (!IS_ERR(st->reg)) {
- ret = regulator_enable(st->reg);
- if (ret)
- goto error_put_reg;
- }
-
- spi_set_drvdata(spi, indio_dev);
-
- st->spi = spi;
-
- indio_dev->name = spi_get_device_id(spi)->name;
- indio_dev->dev.parent = &spi->dev;
- indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->channels = ad7298_channels;
- indio_dev->num_channels = ARRAY_SIZE(ad7298_channels);
- indio_dev->info = &ad7298_info;
-
- /* Setup default message */
-
- st->scan_single_xfer[0].tx_buf = &st->tx_buf[0];
- st->scan_single_xfer[0].len = 2;
- st->scan_single_xfer[0].cs_change = 1;
- st->scan_single_xfer[1].tx_buf = &st->tx_buf[1];
- st->scan_single_xfer[1].len = 2;
- st->scan_single_xfer[1].cs_change = 1;
- st->scan_single_xfer[2].rx_buf = &st->rx_buf[0];
- st->scan_single_xfer[2].len = 2;
-
- spi_message_init(&st->scan_single_msg);
- spi_message_add_tail(&st->scan_single_xfer[0], &st->scan_single_msg);
- spi_message_add_tail(&st->scan_single_xfer[1], &st->scan_single_msg);
- spi_message_add_tail(&st->scan_single_xfer[2], &st->scan_single_msg);
-
- if (pdata && pdata->vref_mv) {
- st->int_vref_mv = pdata->vref_mv;
- st->ext_ref = AD7298_EXTREF;
- } else {
- st->int_vref_mv = AD7298_INTREF_mV;
- }
-
- ret = ad7298_register_ring_funcs_and_init(indio_dev);
- if (ret)
- goto error_disable_reg;
-
- ret = iio_device_register(indio_dev);
- if (ret)
- goto error_cleanup_ring;
-
- return 0;
-
-error_cleanup_ring:
- ad7298_ring_cleanup(indio_dev);
-error_disable_reg:
- if (!IS_ERR(st->reg))
- regulator_disable(st->reg);
-error_put_reg:
- if (!IS_ERR(st->reg))
- regulator_put(st->reg);
- iio_device_free(indio_dev);
-
- return ret;
-}
-
-static int __devexit ad7298_remove(struct spi_device *spi)
-{
- struct iio_dev *indio_dev = spi_get_drvdata(spi);
- struct ad7298_state *st = iio_priv(indio_dev);
-
- iio_device_unregister(indio_dev);
- ad7298_ring_cleanup(indio_dev);
- if (!IS_ERR(st->reg)) {
- regulator_disable(st->reg);
- regulator_put(st->reg);
- }
- iio_device_free(indio_dev);
-
- return 0;
-}
-
-static const struct spi_device_id ad7298_id[] = {
- {"ad7298", 0},
- {}
-};
-MODULE_DEVICE_TABLE(spi, ad7298_id);
-
-static struct spi_driver ad7298_driver = {
- .driver = {
- .name = "ad7298",
- .owner = THIS_MODULE,
- },
- .probe = ad7298_probe,
- .remove = __devexit_p(ad7298_remove),
- .id_table = ad7298_id,
-};
-module_spi_driver(ad7298_driver);
-
-MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
-MODULE_DESCRIPTION("Analog Devices AD7298 ADC");
-MODULE_LICENSE("GPL v2");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.