iio: adc: ltc2497: split protocol independent part in a separate module
This allows to share most of this driver for the ltc2496 driver added in the next commit that is an SPI variant of the ltc2497. Initially I named the generic part ltc249x, but wild card names are frowned upon, so the generic part is called ltc2497-core even though it's not obvious that this is then to be reused for the ltc2496 driver. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Uwe Kleine-König
Jonathan Cameron
parent
59c3662b8f
commit
69548b7c2c
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@ -51,7 +51,7 @@ obj-$(CONFIG_LPC18XX_ADC) += lpc18xx_adc.o
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obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o
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obj-$(CONFIG_LTC2471) += ltc2471.o
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obj-$(CONFIG_LTC2485) += ltc2485.o
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obj-$(CONFIG_LTC2497) += ltc2497.o
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obj-$(CONFIG_LTC2497) += ltc2497.o ltc2497-core.o
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obj-$(CONFIG_MAX1027) += max1027.o
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obj-$(CONFIG_MAX11100) += max11100.o
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obj-$(CONFIG_MAX1118) += max1118.o
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@ -0,0 +1,243 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ltc2497-core.c - Common code for Analog Devices/Linear Technology
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* LTC2496 and LTC2497 ADCs
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*
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* Copyright (C) 2017 Analog Devices Inc.
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*/
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#include <linux/delay.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/driver.h>
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#include <linux/module.h>
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#include <linux/regulator/consumer.h>
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#include "ltc2497.h"
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#define LTC2497_SGL BIT(4)
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#define LTC2497_DIFF 0
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#define LTC2497_SIGN BIT(3)
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static int ltc2497core_wait_conv(struct ltc2497core_driverdata *ddata)
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{
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s64 time_elapsed;
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time_elapsed = ktime_ms_delta(ktime_get(), ddata->time_prev);
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if (time_elapsed < LTC2497_CONVERSION_TIME_MS) {
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/* delay if conversion time not passed
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* since last read or write
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*/
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if (msleep_interruptible(
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LTC2497_CONVERSION_TIME_MS - time_elapsed))
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return -ERESTARTSYS;
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return 0;
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}
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if (time_elapsed - LTC2497_CONVERSION_TIME_MS <= 0) {
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/* We're in automatic mode -
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* so the last reading is still not outdated
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*/
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return 0;
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}
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return 1;
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}
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static int ltc2497core_read(struct ltc2497core_driverdata *ddata, u8 address, int *val)
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{
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int ret;
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ret = ltc2497core_wait_conv(ddata);
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if (ret < 0)
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return ret;
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if (ret || ddata->addr_prev != address) {
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ret = ddata->result_and_measure(ddata, address, NULL);
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if (ret < 0)
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return ret;
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ddata->addr_prev = address;
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if (msleep_interruptible(LTC2497_CONVERSION_TIME_MS))
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return -ERESTARTSYS;
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}
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ret = ddata->result_and_measure(ddata, address, val);
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if (ret < 0)
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return ret;
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ddata->time_prev = ktime_get();
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return ret;
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}
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static int ltc2497core_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct ltc2497core_driverdata *ddata = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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mutex_lock(&indio_dev->mlock);
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ret = ltc2497core_read(ddata, chan->address, val);
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mutex_unlock(&indio_dev->mlock);
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if (ret < 0)
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return ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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ret = regulator_get_voltage(ddata->ref);
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if (ret < 0)
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return ret;
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*val = ret / 1000;
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*val2 = 17;
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return IIO_VAL_FRACTIONAL_LOG2;
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default:
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return -EINVAL;
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}
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}
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#define LTC2497_CHAN(_chan, _addr, _ds_name) { \
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.type = IIO_VOLTAGE, \
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.indexed = 1, \
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.channel = (_chan), \
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.address = (_addr | (_chan / 2) | ((_chan & 1) ? LTC2497_SIGN : 0)), \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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.datasheet_name = (_ds_name), \
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}
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#define LTC2497_CHAN_DIFF(_chan, _addr) { \
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.type = IIO_VOLTAGE, \
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.indexed = 1, \
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.channel = (_chan) * 2 + ((_addr) & LTC2497_SIGN ? 1 : 0), \
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.channel2 = (_chan) * 2 + ((_addr) & LTC2497_SIGN ? 0 : 1),\
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.address = (_addr | _chan), \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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.differential = 1, \
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}
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static const struct iio_chan_spec ltc2497core_channel[] = {
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LTC2497_CHAN(0, LTC2497_SGL, "CH0"),
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LTC2497_CHAN(1, LTC2497_SGL, "CH1"),
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LTC2497_CHAN(2, LTC2497_SGL, "CH2"),
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LTC2497_CHAN(3, LTC2497_SGL, "CH3"),
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LTC2497_CHAN(4, LTC2497_SGL, "CH4"),
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LTC2497_CHAN(5, LTC2497_SGL, "CH5"),
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LTC2497_CHAN(6, LTC2497_SGL, "CH6"),
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LTC2497_CHAN(7, LTC2497_SGL, "CH7"),
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LTC2497_CHAN(8, LTC2497_SGL, "CH8"),
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LTC2497_CHAN(9, LTC2497_SGL, "CH9"),
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LTC2497_CHAN(10, LTC2497_SGL, "CH10"),
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LTC2497_CHAN(11, LTC2497_SGL, "CH11"),
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LTC2497_CHAN(12, LTC2497_SGL, "CH12"),
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LTC2497_CHAN(13, LTC2497_SGL, "CH13"),
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LTC2497_CHAN(14, LTC2497_SGL, "CH14"),
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LTC2497_CHAN(15, LTC2497_SGL, "CH15"),
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LTC2497_CHAN_DIFF(0, LTC2497_DIFF),
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LTC2497_CHAN_DIFF(1, LTC2497_DIFF),
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LTC2497_CHAN_DIFF(2, LTC2497_DIFF),
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LTC2497_CHAN_DIFF(3, LTC2497_DIFF),
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LTC2497_CHAN_DIFF(4, LTC2497_DIFF),
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LTC2497_CHAN_DIFF(5, LTC2497_DIFF),
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LTC2497_CHAN_DIFF(6, LTC2497_DIFF),
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LTC2497_CHAN_DIFF(7, LTC2497_DIFF),
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LTC2497_CHAN_DIFF(0, LTC2497_DIFF | LTC2497_SIGN),
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LTC2497_CHAN_DIFF(1, LTC2497_DIFF | LTC2497_SIGN),
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LTC2497_CHAN_DIFF(2, LTC2497_DIFF | LTC2497_SIGN),
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LTC2497_CHAN_DIFF(3, LTC2497_DIFF | LTC2497_SIGN),
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LTC2497_CHAN_DIFF(4, LTC2497_DIFF | LTC2497_SIGN),
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LTC2497_CHAN_DIFF(5, LTC2497_DIFF | LTC2497_SIGN),
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LTC2497_CHAN_DIFF(6, LTC2497_DIFF | LTC2497_SIGN),
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LTC2497_CHAN_DIFF(7, LTC2497_DIFF | LTC2497_SIGN),
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};
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static const struct iio_info ltc2497core_info = {
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.read_raw = ltc2497core_read_raw,
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};
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int ltc2497core_probe(struct device *dev, struct iio_dev *indio_dev)
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{
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struct ltc2497core_driverdata *ddata = iio_priv(indio_dev);
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int ret;
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indio_dev->dev.parent = dev;
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indio_dev->name = dev_name(dev);
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indio_dev->info = <c2497core_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = ltc2497core_channel;
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indio_dev->num_channels = ARRAY_SIZE(ltc2497core_channel);
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ret = ddata->result_and_measure(ddata, LTC2497_CONFIG_DEFAULT, NULL);
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if (ret < 0)
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return ret;
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ddata->ref = devm_regulator_get(dev, "vref");
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if (IS_ERR(ddata->ref)) {
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if (PTR_ERR(ddata->ref) != -EPROBE_DEFER)
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dev_err(dev, "Failed to get vref regulator: %pe\n",
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ddata->ref);
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return PTR_ERR(ddata->ref);
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}
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ret = regulator_enable(ddata->ref);
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if (ret < 0) {
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dev_err(dev, "Failed to enable vref regulator: %pe\n",
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ERR_PTR(ret));
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return ret;
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}
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if (dev->platform_data) {
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struct iio_map *plat_data;
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plat_data = (struct iio_map *)dev->platform_data;
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ret = iio_map_array_register(indio_dev, plat_data);
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if (ret) {
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dev_err(&indio_dev->dev, "iio map err: %d\n", ret);
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goto err_regulator_disable;
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}
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}
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ddata->addr_prev = LTC2497_CONFIG_DEFAULT;
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ddata->time_prev = ktime_get();
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ret = iio_device_register(indio_dev);
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if (ret < 0)
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goto err_array_unregister;
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return 0;
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err_array_unregister:
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iio_map_array_unregister(indio_dev);
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err_regulator_disable:
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regulator_disable(ddata->ref);
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return ret;
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}
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EXPORT_SYMBOL_NS(ltc2497core_probe, LTC2497);
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void ltc2497core_remove(struct iio_dev *indio_dev)
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{
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struct ltc2497core_driverdata *ddata = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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iio_map_array_unregister(indio_dev);
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regulator_disable(ddata->ref);
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}
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EXPORT_SYMBOL_NS(ltc2497core_remove, LTC2497);
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MODULE_DESCRIPTION("common code for LTC2496/LTC2497 drivers");
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MODULE_LICENSE("GPL v2");
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@ -7,27 +7,18 @@
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* Datasheet: http://cds.linear.com/docs/en/datasheet/2497fd.pdf
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*/
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/driver.h>
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#include <linux/iio/sysfs.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regulator/consumer.h>
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#define LTC2497_ENABLE 0xA0
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#define LTC2497_SGL BIT(4)
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#define LTC2497_DIFF 0
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#define LTC2497_SIGN BIT(3)
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#define LTC2497_CONFIG_DEFAULT LTC2497_ENABLE
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#define LTC2497_CONVERSION_TIME_MS 150ULL
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#include "ltc2497.h"
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struct ltc2497_st {
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struct ltc2497_driverdata {
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/* this must be the first member */
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struct ltc2497core_driverdata common_ddata;
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struct i2c_client *client;
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struct regulator *ref;
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ktime_t time_prev;
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u8 addr_prev;
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/*
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* DMA (thus cache coherency maintenance) requires the
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* transfer buffers to live in their own cache lines.
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@ -35,232 +26,59 @@ struct ltc2497_st {
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__be32 buf ____cacheline_aligned;
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};
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static int ltc2497_wait_conv(struct ltc2497_st *st)
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static int ltc2497_result_and_measure(struct ltc2497core_driverdata *ddata,
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u8 address, int *val)
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{
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s64 time_elapsed;
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time_elapsed = ktime_ms_delta(ktime_get(), st->time_prev);
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if (time_elapsed < LTC2497_CONVERSION_TIME_MS) {
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/* delay if conversion time not passed
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* since last read or write
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*/
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if (msleep_interruptible(
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LTC2497_CONVERSION_TIME_MS - time_elapsed))
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return -ERESTARTSYS;
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return 0;
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}
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if (time_elapsed - LTC2497_CONVERSION_TIME_MS <= 0) {
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/* We're in automatic mode -
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* so the last reading is stil not outdated
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*/
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return 0;
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}
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return 1;
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}
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static int ltc2497_read(struct ltc2497_st *st, u8 address, int *val)
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{
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struct i2c_client *client = st->client;
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struct ltc2497_driverdata *st =
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container_of(ddata, struct ltc2497_driverdata, common_ddata);
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int ret;
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ret = ltc2497_wait_conv(st);
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if (ret < 0)
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return ret;
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if (ret || st->addr_prev != address) {
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ret = i2c_smbus_write_byte(st->client,
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LTC2497_ENABLE | address);
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if (ret < 0)
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if (val) {
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ret = i2c_master_recv(st->client, (char *)&st->buf, 3);
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if (ret < 0) {
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dev_err(&st->client->dev, "i2c_master_recv failed\n");
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return ret;
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st->addr_prev = address;
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if (msleep_interruptible(LTC2497_CONVERSION_TIME_MS))
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return -ERESTARTSYS;
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}
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ret = i2c_master_recv(client, (char *)&st->buf, 3);
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if (ret < 0) {
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dev_err(&client->dev, "i2c_master_recv failed\n");
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return ret;
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}
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st->time_prev = ktime_get();
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}
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/* convert and shift the result,
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* and finally convert from offset binary to signed integer
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*/
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*val = (be32_to_cpu(st->buf) >> 14) - (1 << 17);
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*val = (be32_to_cpu(st->buf) >> 14) - (1 << 17);
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}
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ret = i2c_smbus_write_byte(st->client,
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LTC2497_ENABLE | address);
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if (ret)
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dev_err(&st->client->dev, "i2c transfer failed: %pe\n",
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ERR_PTR(ret));
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return ret;
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}
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static int ltc2497_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct ltc2497_st *st = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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mutex_lock(&indio_dev->mlock);
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ret = ltc2497_read(st, chan->address, val);
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mutex_unlock(&indio_dev->mlock);
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if (ret < 0)
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return ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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ret = regulator_get_voltage(st->ref);
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if (ret < 0)
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return ret;
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*val = ret / 1000;
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*val2 = 17;
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return IIO_VAL_FRACTIONAL_LOG2;
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default:
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return -EINVAL;
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}
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}
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#define LTC2497_CHAN(_chan, _addr, _ds_name) { \
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.type = IIO_VOLTAGE, \
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.indexed = 1, \
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.channel = (_chan), \
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.address = (_addr | (_chan / 2) | ((_chan & 1) ? LTC2497_SIGN : 0)), \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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.datasheet_name = (_ds_name), \
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}
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#define LTC2497_CHAN_DIFF(_chan, _addr) { \
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.type = IIO_VOLTAGE, \
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.indexed = 1, \
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.channel = (_chan) * 2 + ((_addr) & LTC2497_SIGN ? 1 : 0), \
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.channel2 = (_chan) * 2 + ((_addr) & LTC2497_SIGN ? 0 : 1),\
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.address = (_addr | _chan), \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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.differential = 1, \
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}
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static const struct iio_chan_spec ltc2497_channel[] = {
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LTC2497_CHAN(0, LTC2497_SGL, "CH0"),
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LTC2497_CHAN(1, LTC2497_SGL, "CH1"),
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LTC2497_CHAN(2, LTC2497_SGL, "CH2"),
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LTC2497_CHAN(3, LTC2497_SGL, "CH3"),
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LTC2497_CHAN(4, LTC2497_SGL, "CH4"),
|
||||
LTC2497_CHAN(5, LTC2497_SGL, "CH5"),
|
||||
LTC2497_CHAN(6, LTC2497_SGL, "CH6"),
|
||||
LTC2497_CHAN(7, LTC2497_SGL, "CH7"),
|
||||
LTC2497_CHAN(8, LTC2497_SGL, "CH8"),
|
||||
LTC2497_CHAN(9, LTC2497_SGL, "CH9"),
|
||||
LTC2497_CHAN(10, LTC2497_SGL, "CH10"),
|
||||
LTC2497_CHAN(11, LTC2497_SGL, "CH11"),
|
||||
LTC2497_CHAN(12, LTC2497_SGL, "CH12"),
|
||||
LTC2497_CHAN(13, LTC2497_SGL, "CH13"),
|
||||
LTC2497_CHAN(14, LTC2497_SGL, "CH14"),
|
||||
LTC2497_CHAN(15, LTC2497_SGL, "CH15"),
|
||||
LTC2497_CHAN_DIFF(0, LTC2497_DIFF),
|
||||
LTC2497_CHAN_DIFF(1, LTC2497_DIFF),
|
||||
LTC2497_CHAN_DIFF(2, LTC2497_DIFF),
|
||||
LTC2497_CHAN_DIFF(3, LTC2497_DIFF),
|
||||
LTC2497_CHAN_DIFF(4, LTC2497_DIFF),
|
||||
LTC2497_CHAN_DIFF(5, LTC2497_DIFF),
|
||||
LTC2497_CHAN_DIFF(6, LTC2497_DIFF),
|
||||
LTC2497_CHAN_DIFF(7, LTC2497_DIFF),
|
||||
LTC2497_CHAN_DIFF(0, LTC2497_DIFF | LTC2497_SIGN),
|
||||
LTC2497_CHAN_DIFF(1, LTC2497_DIFF | LTC2497_SIGN),
|
||||
LTC2497_CHAN_DIFF(2, LTC2497_DIFF | LTC2497_SIGN),
|
||||
LTC2497_CHAN_DIFF(3, LTC2497_DIFF | LTC2497_SIGN),
|
||||
LTC2497_CHAN_DIFF(4, LTC2497_DIFF | LTC2497_SIGN),
|
||||
LTC2497_CHAN_DIFF(5, LTC2497_DIFF | LTC2497_SIGN),
|
||||
LTC2497_CHAN_DIFF(6, LTC2497_DIFF | LTC2497_SIGN),
|
||||
LTC2497_CHAN_DIFF(7, LTC2497_DIFF | LTC2497_SIGN),
|
||||
};
|
||||
|
||||
static const struct iio_info ltc2497_info = {
|
||||
.read_raw = ltc2497_read_raw,
|
||||
};
|
||||
|
||||
static int ltc2497_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct iio_dev *indio_dev;
|
||||
struct ltc2497_st *st;
|
||||
struct iio_map *plat_data;
|
||||
int ret;
|
||||
struct ltc2497_driverdata *st;
|
||||
struct device *dev = &client->dev;
|
||||
|
||||
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
|
||||
I2C_FUNC_SMBUS_WRITE_BYTE))
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
|
||||
indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
|
||||
if (!indio_dev)
|
||||
return -ENOMEM;
|
||||
|
||||
st = iio_priv(indio_dev);
|
||||
i2c_set_clientdata(client, indio_dev);
|
||||
st->client = client;
|
||||
st->common_ddata.result_and_measure = ltc2497_result_and_measure;
|
||||
|
||||
indio_dev->dev.parent = &client->dev;
|
||||
indio_dev->name = id->name;
|
||||
indio_dev->info = <c2497_info;
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
indio_dev->channels = ltc2497_channel;
|
||||
indio_dev->num_channels = ARRAY_SIZE(ltc2497_channel);
|
||||
|
||||
st->ref = devm_regulator_get(&client->dev, "vref");
|
||||
if (IS_ERR(st->ref))
|
||||
return PTR_ERR(st->ref);
|
||||
|
||||
ret = regulator_enable(st->ref);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
if (client->dev.platform_data) {
|
||||
plat_data = ((struct iio_map *)client->dev.platform_data);
|
||||
ret = iio_map_array_register(indio_dev, plat_data);
|
||||
if (ret) {
|
||||
dev_err(&indio_dev->dev, "iio map err: %d\n", ret);
|
||||
goto err_regulator_disable;
|
||||
}
|
||||
}
|
||||
|
||||
ret = i2c_smbus_write_byte(st->client, LTC2497_CONFIG_DEFAULT);
|
||||
if (ret < 0)
|
||||
goto err_array_unregister;
|
||||
|
||||
st->addr_prev = LTC2497_CONFIG_DEFAULT;
|
||||
st->time_prev = ktime_get();
|
||||
|
||||
ret = iio_device_register(indio_dev);
|
||||
if (ret < 0)
|
||||
goto err_array_unregister;
|
||||
|
||||
return 0;
|
||||
|
||||
err_array_unregister:
|
||||
iio_map_array_unregister(indio_dev);
|
||||
|
||||
err_regulator_disable:
|
||||
regulator_disable(st->ref);
|
||||
|
||||
return ret;
|
||||
return ltc2497core_probe(dev, indio_dev);
|
||||
}
|
||||
|
||||
static int ltc2497_remove(struct i2c_client *client)
|
||||
{
|
||||
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
||||
struct ltc2497_st *st = iio_priv(indio_dev);
|
||||
|
||||
iio_map_array_unregister(indio_dev);
|
||||
iio_device_unregister(indio_dev);
|
||||
regulator_disable(st->ref);
|
||||
ltc2497core_remove(indio_dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -0,0 +1,18 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0-only */
|
||||
|
||||
#define LTC2497_ENABLE 0xA0
|
||||
#define LTC2497_CONFIG_DEFAULT LTC2497_ENABLE
|
||||
#define LTC2497_CONVERSION_TIME_MS 150ULL
|
||||
|
||||
struct ltc2497core_driverdata {
|
||||
struct regulator *ref;
|
||||
ktime_t time_prev;
|
||||
u8 addr_prev;
|
||||
int (*result_and_measure)(struct ltc2497core_driverdata *ddata,
|
||||
u8 address, int *val);
|
||||
};
|
||||
|
||||
int ltc2497core_probe(struct device *dev, struct iio_dev *indio_dev);
|
||||
void ltc2497core_remove(struct iio_dev *indio_dev);
|
||||
|
||||
MODULE_IMPORT_NS(LTC2497);
|
||||
Loading…
Reference in New Issue