iio: adc: new driver to support Linear technology's ltc2496

This chip is similar to the LTC2497 ADC, it just uses SPI instead of I2C
and so has a slightly different protocol. Only the actual hardware
access is different. The spi protocol is different enough to not be able
to map the differences via a regmap.

Also generalize the entry in MAINTAINER to cover the newly introduced
file.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/MAINTAINERS b/MAINTAINERS
index 01212ae..896951d 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1045,7 +1045,7 @@ S:        Supported
 F:     Documentation/ABI/testing/sysfs-bus-iio-frequency-ad9523
 F:     Documentation/ABI/testing/sysfs-bus-iio-frequency-adf4350
 F:     drivers/iio/*/ad*
-F:     drivers/iio/adc/ltc2497*
+F:     drivers/iio/adc/ltc249*
 X:     drivers/iio/*/adjd*
 F:     drivers/staging/iio/*/ad*
 

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 27bb4e5..82e3308 100644 (file)
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -530,6 +530,16 @@ config LTC2485
          To compile this driver as a module, choose M here: the module will be
          called ltc2485.
 
+config LTC2496
+       tristate "Linear Technology LTC2496 ADC driver"
+       depends on SPI
+       help
+         Say yes here to build support for Linear Technology LTC2496
+         16-Bit 8-/16-Channel Delta Sigma ADC.
+
+         To compile this driver as a module, choose M here: the module will be
+         called ltc2496.
+
 config LTC2497
        tristate "Linear Technology LTC2497 ADC driver"
        depends on I2C

diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 5f8d7ac..9192289 100644 (file)
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -51,6 +51,7 @@ obj-$(CONFIG_LPC18XX_ADC) += lpc18xx_adc.o
 obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o
 obj-$(CONFIG_LTC2471) += ltc2471.o
 obj-$(CONFIG_LTC2485) += ltc2485.o
+obj-$(CONFIG_LTC2496) += ltc2496.o ltc2497-core.o
 obj-$(CONFIG_LTC2497) += ltc2497.o ltc2497-core.o
 obj-$(CONFIG_MAX1027) += max1027.o
 obj-$(CONFIG_MAX11100) += max11100.o

diff --git a/drivers/iio/adc/ltc2496.c b/drivers/iio/adc/ltc2496.c
new file mode 100644 (file)
index 0000000..88a3015
--- /dev/null
+++ b/drivers/iio/adc/ltc2496.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ltc2496.c - Driver for Analog Devices/Linear Technology LTC2496 ADC
+ *
+ * Based on ltc2497.c which has
+ * Copyright (C) 2017 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ *
+ * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/2496fc.pdf
+ */
+
+#include <linux/spi/spi.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/driver.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include "ltc2497.h"
+
+struct ltc2496_driverdata {
+       /* this must be the first member */
+       struct ltc2497core_driverdata common_ddata;
+       struct spi_device *spi;
+
+       /*
+        * DMA (thus cache coherency maintenance) requires the
+        * transfer buffers to live in their own cache lines.
+        */
+       unsigned char rxbuf[3] ____cacheline_aligned;
+       unsigned char txbuf[3];
+};
+
+static int ltc2496_result_and_measure(struct ltc2497core_driverdata *ddata,
+                                     u8 address, int *val)
+{
+       struct ltc2496_driverdata *st =
+               container_of(ddata, struct ltc2496_driverdata, common_ddata);
+       struct spi_transfer t = {
+               .tx_buf = st->txbuf,
+               .rx_buf = st->rxbuf,
+               .len = sizeof(st->txbuf),
+       };
+       int ret;
+
+       st->txbuf[0] = LTC2497_ENABLE | address;
+
+       ret = spi_sync_transfer(st->spi, &t, 1);
+       if (ret < 0)  {
+               dev_err(&st->spi->dev, "spi_sync_transfer failed: %pe\n",
+                       ERR_PTR(ret));
+               return ret;
+       }
+
+       if (val)
+               *val = ((st->rxbuf[0] & 0x3f) << 12 |
+                       st->rxbuf[1] << 4 | st->rxbuf[2] >> 4) -
+                       (1 << 17);
+
+       return 0;
+}
+
+static int ltc2496_probe(struct spi_device *spi)
+{
+       struct iio_dev *indio_dev;
+       struct ltc2496_driverdata *st;
+       struct device *dev = &spi->dev;
+
+       indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+       if (!indio_dev)
+               return -ENOMEM;
+
+       st = iio_priv(indio_dev);
+       spi_set_drvdata(spi, indio_dev);
+       st->spi = spi;
+       st->common_ddata.result_and_measure = ltc2496_result_and_measure;
+
+       return ltc2497core_probe(dev, indio_dev);
+}
+
+static int ltc2496_remove(struct spi_device *spi)
+{
+       struct iio_dev *indio_dev = spi_get_drvdata(spi);
+
+       ltc2497core_remove(indio_dev);
+
+       return 0;
+}
+
+static const struct of_device_id ltc2496_of_match[] = {
+       { .compatible = "lltc,ltc2496", },
+       {},
+};
+MODULE_DEVICE_TABLE(of, ltc2496_of_match);
+
+static struct spi_driver ltc2496_driver = {
+       .driver = {
+               .name = "ltc2496",
+               .of_match_table = of_match_ptr(ltc2496_of_match),
+       },
+       .probe = ltc2496_probe,
+       .remove = ltc2496_remove,
+};
+module_spi_driver(ltc2496_driver);
+
+MODULE_AUTHOR("Uwe Kleine-König <u.kleine-könig@pengutronix.de>");
+MODULE_DESCRIPTION("Linear Technology LTC2496 ADC driver");
+MODULE_LICENSE("GPL v2");