mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
281dfd0b6e
CONFIG_HOTPLUG is going away as an option so __devexit is no longer needed. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Cc: Hans de Goede <hdegoede@redhat.com> Cc: Jean Delvare <khali@linux-fr.org> Cc: Alistair John Strachan <alistair@devzero.co.uk> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Juerg Haefliger <juergh@gmail.com> Cc: Andreas Herrmann <herrmann.der.user@googlemail.com> Cc: Clemens Ladisch <clemens@ladisch.de> Cc: Rudolf Marek <r.marek@assembler.cz> Cc: Jim Cromie <jim.cromie@gmail.com> Cc: "Mark M. Hoffman" <mhoffman@lightlink.com> Cc: Roger Lucas <vt8231@hiddenengine.co.uk> Acked-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
251 lines
6.5 KiB
C
251 lines
6.5 KiB
C
/*
|
|
* 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/slab.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/mod_devicetable.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 = spi_get_drvdata(spi);
|
|
u8 tx_buf[2];
|
|
u8 rx_buf[2];
|
|
int status;
|
|
u32 value;
|
|
|
|
if (mutex_lock_interruptible(&adc->lock))
|
|
return -ERESTARTSYS;
|
|
|
|
if (adc->channels == 1) {
|
|
status = spi_read(spi, rx_buf, sizeof(rx_buf));
|
|
} else {
|
|
tx_buf[0] = attr->index << 3; /* other bits are don't care */
|
|
status = spi_write_then_read(spi, tx_buf, sizeof(tx_buf),
|
|
rx_buf, sizeof(rx_buf));
|
|
}
|
|
if (status < 0) {
|
|
dev_warn(dev, "SPI synch. transfer 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 = spi_get_drvdata(spi);
|
|
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 = spi_get_drvdata(spi);
|
|
unsigned long value;
|
|
|
|
if (kstrtoul(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)
|
|
{
|
|
return sprintf(buf, "%s\n", to_spi_device(dev)->modalias);
|
|
}
|
|
|
|
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 adcxx_probe(struct spi_device *spi)
|
|
{
|
|
int channels = spi_get_device_id(spi)->driver_data;
|
|
struct adcxx *adc;
|
|
int status;
|
|
int i;
|
|
|
|
adc = devm_kzalloc(&spi->dev, 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);
|
|
|
|
spi_set_drvdata(spi, 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);
|
|
|
|
spi_set_drvdata(spi, NULL);
|
|
mutex_unlock(&adc->lock);
|
|
return status;
|
|
}
|
|
|
|
static int adcxx_remove(struct spi_device *spi)
|
|
{
|
|
struct adcxx *adc = spi_get_drvdata(spi);
|
|
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);
|
|
|
|
spi_set_drvdata(spi, NULL);
|
|
mutex_unlock(&adc->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct spi_device_id adcxx_ids[] = {
|
|
{ "adcxx1s", 1 },
|
|
{ "adcxx2s", 2 },
|
|
{ "adcxx4s", 4 },
|
|
{ "adcxx8s", 8 },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(spi, adcxx_ids);
|
|
|
|
static struct spi_driver adcxx_driver = {
|
|
.driver = {
|
|
.name = "adcxx",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.id_table = adcxx_ids,
|
|
.probe = adcxx_probe,
|
|
.remove = adcxx_remove,
|
|
};
|
|
|
|
module_spi_driver(adcxx_driver);
|
|
|
|
MODULE_AUTHOR("Marc Pignat");
|
|
MODULE_DESCRIPTION("National Semiconductor adcxx8sxxx Linux driver");
|
|
MODULE_LICENSE("GPL");
|