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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 675 mass ave cambridge ma 02139 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 441 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
234 lines
5.6 KiB
C
234 lines
5.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* adcxx.c
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*
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* The adcxx4s is an AD converter family from National Semiconductor (NS).
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*
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* Copyright (c) 2008 Marc Pignat <marc.pignat@hevs.ch>
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*
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* The adcxx4s communicates with a host processor via an SPI/Microwire Bus
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* interface. This driver supports the whole family of devices with name
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* ADC<bb><c>S<sss>, where
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* * bb is the resolution in number of bits (8, 10, 12)
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* * c is the number of channels (1, 2, 4, 8)
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* * sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500 kSPS
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* and 101 for 1 MSPS)
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*
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* Complete datasheets are available at National's website here:
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* http://www.national.com/ds/DC/ADC<bb><c>S<sss>.pdf
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*
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* Handling of 8, 10 and 12 bits converters are the same, the
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* unavailable bits are 0 :)
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/sysfs.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/mutex.h>
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#include <linux/mod_devicetable.h>
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#include <linux/spi/spi.h>
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#define DRVNAME "adcxx"
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struct adcxx {
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struct device *hwmon_dev;
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struct mutex lock;
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u32 channels;
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u32 reference; /* in millivolts */
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};
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/* sysfs hook function */
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static ssize_t adcxx_show(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct spi_device *spi = to_spi_device(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct adcxx *adc = spi_get_drvdata(spi);
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u8 tx_buf[2];
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u8 rx_buf[2];
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int status;
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u32 value;
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if (mutex_lock_interruptible(&adc->lock))
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return -ERESTARTSYS;
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if (adc->channels == 1) {
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status = spi_read(spi, rx_buf, sizeof(rx_buf));
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} else {
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tx_buf[0] = attr->index << 3; /* other bits are don't care */
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status = spi_write_then_read(spi, tx_buf, sizeof(tx_buf),
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rx_buf, sizeof(rx_buf));
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}
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if (status < 0) {
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dev_warn(dev, "SPI synch. transfer failed with status %d\n",
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status);
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goto out;
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}
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value = (rx_buf[0] << 8) + rx_buf[1];
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dev_dbg(dev, "raw value = 0x%x\n", value);
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value = value * adc->reference >> 12;
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status = sprintf(buf, "%d\n", value);
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out:
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mutex_unlock(&adc->lock);
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return status;
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}
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static ssize_t adcxx_min_show(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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/* The minimum reference is 0 for this chip family */
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return sprintf(buf, "0\n");
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}
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static ssize_t adcxx_max_show(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct spi_device *spi = to_spi_device(dev);
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struct adcxx *adc = spi_get_drvdata(spi);
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u32 reference;
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if (mutex_lock_interruptible(&adc->lock))
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return -ERESTARTSYS;
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reference = adc->reference;
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mutex_unlock(&adc->lock);
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return sprintf(buf, "%d\n", reference);
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}
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static ssize_t adcxx_max_store(struct device *dev,
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struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct spi_device *spi = to_spi_device(dev);
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struct adcxx *adc = spi_get_drvdata(spi);
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unsigned long value;
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if (kstrtoul(buf, 10, &value))
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return -EINVAL;
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if (mutex_lock_interruptible(&adc->lock))
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return -ERESTARTSYS;
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adc->reference = value;
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mutex_unlock(&adc->lock);
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return count;
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}
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static ssize_t adcxx_name_show(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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return sprintf(buf, "%s\n", to_spi_device(dev)->modalias);
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}
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static struct sensor_device_attribute ad_input[] = {
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SENSOR_ATTR_RO(name, adcxx_name, 0),
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SENSOR_ATTR_RO(in_min, adcxx_min, 0),
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SENSOR_ATTR_RW(in_max, adcxx_max, 0),
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SENSOR_ATTR_RO(in0_input, adcxx, 0),
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SENSOR_ATTR_RO(in1_input, adcxx, 1),
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SENSOR_ATTR_RO(in2_input, adcxx, 2),
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SENSOR_ATTR_RO(in3_input, adcxx, 3),
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SENSOR_ATTR_RO(in4_input, adcxx, 4),
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SENSOR_ATTR_RO(in5_input, adcxx, 5),
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SENSOR_ATTR_RO(in6_input, adcxx, 6),
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SENSOR_ATTR_RO(in7_input, adcxx, 7),
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};
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/*----------------------------------------------------------------------*/
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static int adcxx_probe(struct spi_device *spi)
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{
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int channels = spi_get_device_id(spi)->driver_data;
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struct adcxx *adc;
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int status;
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int i;
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adc = devm_kzalloc(&spi->dev, sizeof(*adc), GFP_KERNEL);
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if (!adc)
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return -ENOMEM;
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/* set a default value for the reference */
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adc->reference = 3300;
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adc->channels = channels;
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mutex_init(&adc->lock);
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mutex_lock(&adc->lock);
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spi_set_drvdata(spi, adc);
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for (i = 0; i < 3 + adc->channels; i++) {
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status = device_create_file(&spi->dev, &ad_input[i].dev_attr);
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if (status) {
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dev_err(&spi->dev, "device_create_file failed.\n");
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goto out_err;
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}
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}
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adc->hwmon_dev = hwmon_device_register(&spi->dev);
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if (IS_ERR(adc->hwmon_dev)) {
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dev_err(&spi->dev, "hwmon_device_register failed.\n");
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status = PTR_ERR(adc->hwmon_dev);
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goto out_err;
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}
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mutex_unlock(&adc->lock);
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return 0;
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out_err:
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for (i--; i >= 0; i--)
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device_remove_file(&spi->dev, &ad_input[i].dev_attr);
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mutex_unlock(&adc->lock);
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return status;
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}
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static int adcxx_remove(struct spi_device *spi)
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{
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struct adcxx *adc = spi_get_drvdata(spi);
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int i;
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mutex_lock(&adc->lock);
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hwmon_device_unregister(adc->hwmon_dev);
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for (i = 0; i < 3 + adc->channels; i++)
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device_remove_file(&spi->dev, &ad_input[i].dev_attr);
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mutex_unlock(&adc->lock);
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return 0;
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}
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static const struct spi_device_id adcxx_ids[] = {
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{ "adcxx1s", 1 },
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{ "adcxx2s", 2 },
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{ "adcxx4s", 4 },
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{ "adcxx8s", 8 },
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{ },
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};
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MODULE_DEVICE_TABLE(spi, adcxx_ids);
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static struct spi_driver adcxx_driver = {
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.driver = {
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.name = "adcxx",
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},
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.id_table = adcxx_ids,
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.probe = adcxx_probe,
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.remove = adcxx_remove,
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};
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module_spi_driver(adcxx_driver);
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MODULE_AUTHOR("Marc Pignat");
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MODULE_DESCRIPTION("National Semiconductor adcxx8sxxx Linux driver");
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MODULE_LICENSE("GPL");
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