hwmon: ADC124S501 generic driver (d42139a3) · Commits · 戴 / test

drivers/hwmon/Kconfig

+16 −0

Original line number	Diff line number	Diff line
		@@ -77,6 +77,22 @@ config SENSORS_AD7418
		This driver can also be built as a module. If so, the module
		will be called ad7418.

		config SENSORS_ADCXX
		tristate "National Semiconductor ADCxxxSxxx"
		depends on SPI_MASTER && EXPERIMENTAL
		help
		If you say yes here you get support for the National Semiconductor
		ADC<bb><c>S<sss> chip family, where
		* bb is the resolution in number of bits (8, 10, 12)
		* c is the number of channels (1, 2, 4, 8)
		* sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500
		kSPS and 101 for 1 MSPS)

		Examples : ADC081S101, ADC124S501, ...

		This driver can also be built as a module. If so, the module
		will be called adcxx.

		config SENSORS_ADM1021
		tristate "Analog Devices ADM1021 and compatibles"
		depends on I2C

drivers/hwmon/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -17,6 +17,7 @@ obj-$(CONFIG_SENSORS_ABITUGURU) += abituguru.o
		obj-$(CONFIG_SENSORS_ABITUGURU3)+= abituguru3.o
		obj-$(CONFIG_SENSORS_AD7414) += ad7414.o
		obj-$(CONFIG_SENSORS_AD7418) += ad7418.o
		obj-$(CONFIG_SENSORS_ADCXX) += adcxx.o
		obj-$(CONFIG_SENSORS_ADM1021) += adm1021.o
		obj-$(CONFIG_SENSORS_ADM1025) += adm1025.o
		obj-$(CONFIG_SENSORS_ADM1026) += adm1026.o

drivers/hwmon/adcxx.c

0 → 100644

+329 −0

Original line number	Diff line number	Diff line
		/*
		* adcxx.c
		*
		* The adcxx4s is an AD converter family from National Semiconductor (NS).
		*
		* Copyright (c) 2008 Marc Pignat <marc.pignat@hevs.ch>
		*
		* The adcxx4s communicates with a host processor via an SPI/Microwire Bus
		* interface. This driver supports the whole family of devices with name
		* ADC<bb><c>S<sss>, where
		* * bb is the resolution in number of bits (8, 10, 12)
		* * c is the number of channels (1, 2, 4, 8)
		* * sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500 kSPS
		* and 101 for 1 MSPS)
		*
		* Complete datasheets are available at National's website here:
		* http://www.national.com/ds/DC/ADC<bb><c>S<sss>.pdf
		*
		* Handling of 8, 10 and 12 bits converters are the same, the
		* unavailable bits are 0 :)
		*
		* 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.
		*/

		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/kernel.h>
		#include <linux/device.h>
		#include <linux/err.h>
		#include <linux/sysfs.h>
		#include <linux/hwmon.h>
		#include <linux/hwmon-sysfs.h>
		#include <linux/mutex.h>
		#include <linux/spi/spi.h>

		#define DRVNAME "adcxx"

		struct adcxx {
		struct device *hwmon_dev;
		struct mutex lock;
		u32 channels;
		u32 reference; /* in millivolts */
		};

		/* sysfs hook function */
		static ssize_t adcxx_read(struct device *dev,
		struct device_attribute devattr, char buf)
		{
		struct spi_device *spi = to_spi_device(dev);
		struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
		struct adcxx *adc = dev_get_drvdata(&spi->dev);
		u8 tx_buf[2] = { attr->index << 3 }; /* other bits are don't care */
		u8 rx_buf[2];
		int status;
		int value;

		if (mutex_lock_interruptible(&adc->lock))
		return -ERESTARTSYS;

		status = spi_write_then_read(spi, tx_buf, sizeof(tx_buf),
		rx_buf, sizeof(rx_buf));
		if (status < 0) {
		dev_warn(dev, "spi_write_then_read failed with status %d\n",
		status);
		goto out;
		}

		value = (rx_buf[0] << 8) + rx_buf[1];
		dev_dbg(dev, "raw value = 0x%x\n", value);

		value = value * adc->reference >> 12;
		status = sprintf(buf, "%d\n", value);
		out:
		mutex_unlock(&adc->lock);
		return status;
		}

		static ssize_t adcxx_show_min(struct device *dev,
		struct device_attribute devattr, char buf)
		{
		/* The minimum reference is 0 for this chip family */
		return sprintf(buf, "0\n");
		}

		static ssize_t adcxx_show_max(struct device *dev,
		struct device_attribute devattr, char buf)
		{
		struct spi_device *spi = to_spi_device(dev);
		struct adcxx *adc = dev_get_drvdata(&spi->dev);
		u32 reference;

		if (mutex_lock_interruptible(&adc->lock))
		return -ERESTARTSYS;

		reference = adc->reference;

		mutex_unlock(&adc->lock);

		return sprintf(buf, "%d\n", reference);
		}

		static ssize_t adcxx_set_max(struct device *dev,
		struct device_attribute devattr, const char buf, size_t count)
		{
		struct spi_device *spi = to_spi_device(dev);
		struct adcxx *adc = dev_get_drvdata(&spi->dev);
		unsigned long value;

		if (strict_strtoul(buf, 10, &value))
		return -EINVAL;

		if (mutex_lock_interruptible(&adc->lock))
		return -ERESTARTSYS;

		adc->reference = value;

		mutex_unlock(&adc->lock);

		return count;
		}

		static ssize_t adcxx_show_name(struct device *dev, struct device_attribute
		devattr, char buf)
		{
		struct spi_device *spi = to_spi_device(dev);
		struct adcxx *adc = dev_get_drvdata(&spi->dev);

		return sprintf(buf, "adcxx%ds\n", adc->channels);
		}

		static struct sensor_device_attribute ad_input[] = {
		SENSOR_ATTR(name, S_IRUGO, adcxx_show_name, NULL, 0),
		SENSOR_ATTR(in_min, S_IRUGO, adcxx_show_min, NULL, 0),
		SENSOR_ATTR(in_max, S_IWUSR \| S_IRUGO, adcxx_show_max,
		adcxx_set_max, 0),
		SENSOR_ATTR(in0_input, S_IRUGO, adcxx_read, NULL, 0),
		SENSOR_ATTR(in1_input, S_IRUGO, adcxx_read, NULL, 1),
		SENSOR_ATTR(in2_input, S_IRUGO, adcxx_read, NULL, 2),
		SENSOR_ATTR(in3_input, S_IRUGO, adcxx_read, NULL, 3),
		SENSOR_ATTR(in4_input, S_IRUGO, adcxx_read, NULL, 4),
		SENSOR_ATTR(in5_input, S_IRUGO, adcxx_read, NULL, 5),
		SENSOR_ATTR(in6_input, S_IRUGO, adcxx_read, NULL, 6),
		SENSOR_ATTR(in7_input, S_IRUGO, adcxx_read, NULL, 7),
		};

		/----------------------------------------------------------------------/

		static int __devinit adcxx_probe(struct spi_device *spi, int channels)
		{
		struct adcxx *adc;
		int status;
		int i;

		adc = kzalloc(sizeof *adc, GFP_KERNEL);
		if (!adc)
		return -ENOMEM;

		/* set a default value for the reference */
		adc->reference = 3300;
		adc->channels = channels;
		mutex_init(&adc->lock);

		mutex_lock(&adc->lock);

		dev_set_drvdata(&spi->dev, adc);

		for (i = 0; i < 3 + adc->channels; i++) {
		status = device_create_file(&spi->dev, &ad_input[i].dev_attr);
		if (status) {
		dev_err(&spi->dev, "device_create_file failed.\n");
		goto out_err;
		}
		}

		adc->hwmon_dev = hwmon_device_register(&spi->dev);
		if (IS_ERR(adc->hwmon_dev)) {
		dev_err(&spi->dev, "hwmon_device_register failed.\n");
		status = PTR_ERR(adc->hwmon_dev);
		goto out_err;
		}

		mutex_unlock(&adc->lock);
		return 0;

		out_err:
		for (i--; i >= 0; i--)
		device_remove_file(&spi->dev, &ad_input[i].dev_attr);

		dev_set_drvdata(&spi->dev, NULL);
		mutex_unlock(&adc->lock);
		kfree(adc);
		return status;
		}

		static int __devinit adcxx1s_probe(struct spi_device *spi)
		{
		return adcxx_probe(spi, 1);
		}

		static int __devinit adcxx2s_probe(struct spi_device *spi)
		{
		return adcxx_probe(spi, 2);
		}

		static int __devinit adcxx4s_probe(struct spi_device *spi)
		{
		return adcxx_probe(spi, 4);
		}

		static int __devinit adcxx8s_probe(struct spi_device *spi)
		{
		return adcxx_probe(spi, 8);
		}

		static int __devexit adcxx_remove(struct spi_device *spi)
		{
		struct adcxx *adc = dev_get_drvdata(&spi->dev);
		int i;

		mutex_lock(&adc->lock);
		hwmon_device_unregister(adc->hwmon_dev);
		for (i = 0; i < 3 + adc->channels; i++)
		device_remove_file(&spi->dev, &ad_input[i].dev_attr);

		dev_set_drvdata(&spi->dev, NULL);
		mutex_unlock(&adc->lock);
		kfree(adc);

		return 0;
		}

		static struct spi_driver adcxx1s_driver = {
		.driver = {
		.name = "adcxx1s",
		.owner = THIS_MODULE,
		},
		.probe = adcxx1s_probe,
		.remove = __devexit_p(adcxx_remove),
		};

		static struct spi_driver adcxx2s_driver = {
		.driver = {
		.name = "adcxx2s",
		.owner = THIS_MODULE,
		},
		.probe = adcxx2s_probe,
		.remove = __devexit_p(adcxx_remove),
		};

		static struct spi_driver adcxx4s_driver = {
		.driver = {
		.name = "adcxx4s",
		.owner = THIS_MODULE,
		},
		.probe = adcxx4s_probe,
		.remove = __devexit_p(adcxx_remove),
		};

		static struct spi_driver adcxx8s_driver = {
		.driver = {
		.name = "adcxx8s",
		.owner = THIS_MODULE,
		},
		.probe = adcxx8s_probe,
		.remove = __devexit_p(adcxx_remove),
		};

		static int __init init_adcxx(void)
		{
		int status;
		status = spi_register_driver(&adcxx1s_driver);
		if (status)
		goto reg_1_failed;

		status = spi_register_driver(&adcxx2s_driver);
		if (status)
		goto reg_2_failed;

		status = spi_register_driver(&adcxx4s_driver);
		if (status)
		goto reg_4_failed;

		status = spi_register_driver(&adcxx8s_driver);
		if (status)
		goto reg_8_failed;

		return status;

		reg_8_failed:
		spi_unregister_driver(&adcxx4s_driver);
		reg_4_failed:
		spi_unregister_driver(&adcxx2s_driver);
		reg_2_failed:
		spi_unregister_driver(&adcxx1s_driver);
		reg_1_failed:
		return status;
		}

		static void __exit exit_adcxx(void)
		{
		spi_unregister_driver(&adcxx1s_driver);
		spi_unregister_driver(&adcxx2s_driver);
		spi_unregister_driver(&adcxx4s_driver);
		spi_unregister_driver(&adcxx8s_driver);
		}

		module_init(init_adcxx);
		module_exit(exit_adcxx);

		MODULE_AUTHOR("Marc Pignat");
		MODULE_DESCRIPTION("National Semiconductor adcxx8sxxx Linux driver");
		MODULE_LICENSE("GPL");

		MODULE_ALIAS("adcxx1s");
		MODULE_ALIAS("adcxx2s");
		MODULE_ALIAS("adcxx4s");
		MODULE_ALIAS("adcxx8s");

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