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1695c52a12
Set the iio device's name based on the chip used for the LTC2499 only. The most common way for IIO clients to interact with a device is to address it based on it's name. By using the dev_name() function, the name will be set based on a i2c_client's kobj name, which has the format i2c_instance-i2c_address (1-0076 for example). This is not ideal, since it makes a requirement for userspace to have knowledge about the hardware connections of the device. The name field is set to NULL for the LTC2497 and LTC2496, so that the old name can kept as it is, since changing it will result in an ABI breakage. Signed-off-by: Ciprian Regus <ciprian.regus@analog.com> Link: https://lore.kernel.org/r/20220916140922.2506248-6-ciprian.regus@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
113 lines
2.7 KiB
C
113 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ltc2496.c - Driver for Analog Devices/Linear Technology LTC2496 ADC
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*
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* Based on ltc2497.c which has
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* Copyright (C) 2017 Analog Devices Inc.
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*
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* Licensed under the GPL-2.
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*
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* Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/2496fc.pdf
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*/
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#include <linux/spi/spi.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/mod_devicetable.h>
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#include <linux/property.h>
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#include "ltc2497.h"
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struct ltc2496_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 spi_device *spi;
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/*
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* DMA (thus cache coherency maintenance) may require the
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* transfer buffers to live in their own cache lines.
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*/
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unsigned char rxbuf[3] __aligned(IIO_DMA_MINALIGN);
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unsigned char txbuf[3];
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};
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static int ltc2496_result_and_measure(struct ltc2497core_driverdata *ddata,
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u8 address, int *val)
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{
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struct ltc2496_driverdata *st =
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container_of(ddata, struct ltc2496_driverdata, common_ddata);
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struct spi_transfer t = {
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.tx_buf = st->txbuf,
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.rx_buf = st->rxbuf,
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.len = sizeof(st->txbuf),
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};
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int ret;
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st->txbuf[0] = LTC2497_ENABLE | address;
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ret = spi_sync_transfer(st->spi, &t, 1);
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if (ret < 0) {
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dev_err(&st->spi->dev, "spi_sync_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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if (val)
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*val = ((st->rxbuf[0] & 0x3f) << 12 |
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st->rxbuf[1] << 4 | st->rxbuf[2] >> 4) -
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(1 << 17);
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return 0;
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}
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static int ltc2496_probe(struct spi_device *spi)
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{
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struct iio_dev *indio_dev;
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struct ltc2496_driverdata *st;
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struct device *dev = &spi->dev;
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indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
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if (!indio_dev)
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return -ENOMEM;
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st = iio_priv(indio_dev);
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spi_set_drvdata(spi, indio_dev);
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st->spi = spi;
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st->common_ddata.result_and_measure = ltc2496_result_and_measure;
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st->common_ddata.chip_info = device_get_match_data(dev);
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return ltc2497core_probe(dev, indio_dev);
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}
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static void ltc2496_remove(struct spi_device *spi)
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{
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struct iio_dev *indio_dev = spi_get_drvdata(spi);
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ltc2497core_remove(indio_dev);
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}
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static const struct ltc2497_chip_info ltc2496_info = {
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.resolution = 16,
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.name = NULL,
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};
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static const struct of_device_id ltc2496_of_match[] = {
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{ .compatible = "lltc,ltc2496", .data = <c2496_info, },
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{},
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};
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MODULE_DEVICE_TABLE(of, ltc2496_of_match);
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static struct spi_driver ltc2496_driver = {
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.driver = {
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.name = "ltc2496",
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.of_match_table = ltc2496_of_match,
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},
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.probe = ltc2496_probe,
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.remove = ltc2496_remove,
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};
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module_spi_driver(ltc2496_driver);
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MODULE_AUTHOR("Uwe Kleine-König <u.kleine-könig@pengutronix.de>");
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MODULE_DESCRIPTION("Linear Technology LTC2496 ADC driver");
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MODULE_LICENSE("GPL v2");
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