2009-07-18 03:12:28 -06:00
|
|
|
/* linux/drivers/hwmon/s3c-hwmon.c
|
|
|
|
*
|
|
|
|
* Copyright (C) 2005, 2008, 2009 Simtec Electronics
|
|
|
|
* http://armlinux.simtec.co.uk/
|
|
|
|
* Ben Dooks <ben@simtec.co.uk>
|
|
|
|
*
|
|
|
|
* S3C24XX/S3C64XX ADC hwmon support
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or modify
|
|
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
|
|
* published by the Free Software Foundation.
|
|
|
|
*
|
|
|
|
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/io.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/err.h>
|
|
|
|
#include <linux/clk.h>
|
|
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <linux/platform_device.h>
|
|
|
|
|
|
|
|
#include <linux/hwmon.h>
|
|
|
|
#include <linux/hwmon-sysfs.h>
|
|
|
|
|
|
|
|
#include <plat/adc.h>
|
2012-08-24 07:22:12 -06:00
|
|
|
#include <linux/platform_data/hwmon-s3c.h>
|
2009-07-18 03:12:28 -06:00
|
|
|
|
|
|
|
struct s3c_hwmon_attr {
|
|
|
|
struct sensor_device_attribute in;
|
|
|
|
struct sensor_device_attribute label;
|
|
|
|
char in_name[12];
|
|
|
|
char label_name[12];
|
|
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
|
|
* struct s3c_hwmon - ADC hwmon client information
|
|
|
|
* @lock: Access lock to serialise the conversions.
|
|
|
|
* @client: The client we registered with the S3C ADC core.
|
|
|
|
* @hwmon_dev: The hwmon device we created.
|
|
|
|
* @attr: The holders for the channel attributes.
|
|
|
|
*/
|
|
|
|
struct s3c_hwmon {
|
2010-10-28 12:31:44 -06:00
|
|
|
struct mutex lock;
|
2009-07-18 03:12:28 -06:00
|
|
|
struct s3c_adc_client *client;
|
|
|
|
struct device *hwmon_dev;
|
|
|
|
|
|
|
|
struct s3c_hwmon_attr attrs[8];
|
|
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
|
|
* s3c_hwmon_read_ch - read a value from a given adc channel.
|
|
|
|
* @dev: The device.
|
|
|
|
* @hwmon: Our state.
|
|
|
|
* @channel: The channel we're reading from.
|
|
|
|
*
|
|
|
|
* Read a value from the @channel with the proper locking and sleep until
|
|
|
|
* either the read completes or we timeout awaiting the ADC core to get
|
|
|
|
* back to us.
|
|
|
|
*/
|
|
|
|
static int s3c_hwmon_read_ch(struct device *dev,
|
|
|
|
struct s3c_hwmon *hwmon, int channel)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
2010-10-28 12:31:44 -06:00
|
|
|
ret = mutex_lock_interruptible(&hwmon->lock);
|
2009-07-18 03:12:28 -06:00
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
dev_dbg(dev, "reading channel %d\n", channel);
|
|
|
|
|
|
|
|
ret = s3c_adc_read(hwmon->client, channel);
|
2010-10-28 12:31:44 -06:00
|
|
|
mutex_unlock(&hwmon->lock);
|
2009-07-18 03:12:28 -06:00
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_SENSORS_S3C_RAW
|
|
|
|
/**
|
|
|
|
* s3c_hwmon_show_raw - show a conversion from the raw channel number.
|
|
|
|
* @dev: The device that the attribute belongs to.
|
|
|
|
* @attr: The attribute being read.
|
|
|
|
* @buf: The result buffer.
|
|
|
|
*
|
|
|
|
* This show deals with the raw attribute, registered for each possible
|
|
|
|
* ADC channel. This does a conversion and returns the raw (un-scaled)
|
|
|
|
* value returned from the hardware.
|
|
|
|
*/
|
|
|
|
static ssize_t s3c_hwmon_show_raw(struct device *dev,
|
|
|
|
struct device_attribute *attr, char *buf)
|
|
|
|
{
|
|
|
|
struct s3c_hwmon *adc = platform_get_drvdata(to_platform_device(dev));
|
|
|
|
struct sensor_device_attribute *sa = to_sensor_dev_attr(attr);
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = s3c_hwmon_read_ch(dev, adc, sa->index);
|
|
|
|
|
|
|
|
return (ret < 0) ? ret : snprintf(buf, PAGE_SIZE, "%d\n", ret);
|
|
|
|
}
|
|
|
|
|
|
|
|
#define DEF_ADC_ATTR(x) \
|
|
|
|
static SENSOR_DEVICE_ATTR(adc##x##_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, x)
|
|
|
|
|
|
|
|
DEF_ADC_ATTR(0);
|
|
|
|
DEF_ADC_ATTR(1);
|
|
|
|
DEF_ADC_ATTR(2);
|
|
|
|
DEF_ADC_ATTR(3);
|
|
|
|
DEF_ADC_ATTR(4);
|
|
|
|
DEF_ADC_ATTR(5);
|
|
|
|
DEF_ADC_ATTR(6);
|
|
|
|
DEF_ADC_ATTR(7);
|
|
|
|
|
|
|
|
static struct attribute *s3c_hwmon_attrs[9] = {
|
|
|
|
&sensor_dev_attr_adc0_raw.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_adc1_raw.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_adc2_raw.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_adc3_raw.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_adc4_raw.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_adc5_raw.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_adc6_raw.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_adc7_raw.dev_attr.attr,
|
|
|
|
NULL,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct attribute_group s3c_hwmon_attrgroup = {
|
|
|
|
.attrs = s3c_hwmon_attrs,
|
|
|
|
};
|
|
|
|
|
|
|
|
static inline int s3c_hwmon_add_raw(struct device *dev)
|
|
|
|
{
|
|
|
|
return sysfs_create_group(&dev->kobj, &s3c_hwmon_attrgroup);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void s3c_hwmon_remove_raw(struct device *dev)
|
|
|
|
{
|
|
|
|
sysfs_remove_group(&dev->kobj, &s3c_hwmon_attrgroup);
|
|
|
|
}
|
|
|
|
|
|
|
|
#else
|
|
|
|
|
|
|
|
static inline int s3c_hwmon_add_raw(struct device *dev) { return 0; }
|
|
|
|
static inline void s3c_hwmon_remove_raw(struct device *dev) { }
|
|
|
|
|
|
|
|
#endif /* CONFIG_SENSORS_S3C_RAW */
|
|
|
|
|
|
|
|
/**
|
|
|
|
* s3c_hwmon_ch_show - show value of a given channel
|
|
|
|
* @dev: The device that the attribute belongs to.
|
|
|
|
* @attr: The attribute being read.
|
|
|
|
* @buf: The result buffer.
|
|
|
|
*
|
|
|
|
* Read a value from the ADC and scale it before returning it to the
|
|
|
|
* caller. The scale factor is gained from the channel configuration
|
|
|
|
* passed via the platform data when the device was registered.
|
|
|
|
*/
|
|
|
|
static ssize_t s3c_hwmon_ch_show(struct device *dev,
|
|
|
|
struct device_attribute *attr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
struct sensor_device_attribute *sen_attr = to_sensor_dev_attr(attr);
|
|
|
|
struct s3c_hwmon *hwmon = platform_get_drvdata(to_platform_device(dev));
|
|
|
|
struct s3c_hwmon_pdata *pdata = dev->platform_data;
|
|
|
|
struct s3c_hwmon_chcfg *cfg;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
cfg = pdata->in[sen_attr->index];
|
|
|
|
|
|
|
|
ret = s3c_hwmon_read_ch(dev, hwmon, sen_attr->index);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
ret *= cfg->mult;
|
|
|
|
ret = DIV_ROUND_CLOSEST(ret, cfg->div);
|
|
|
|
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", ret);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* s3c_hwmon_label_show - show label name of the given channel.
|
|
|
|
* @dev: The device that the attribute belongs to.
|
|
|
|
* @attr: The attribute being read.
|
|
|
|
* @buf: The result buffer.
|
|
|
|
*
|
|
|
|
* Return the label name of a given channel
|
|
|
|
*/
|
|
|
|
static ssize_t s3c_hwmon_label_show(struct device *dev,
|
|
|
|
struct device_attribute *attr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
struct sensor_device_attribute *sen_attr = to_sensor_dev_attr(attr);
|
|
|
|
struct s3c_hwmon_pdata *pdata = dev->platform_data;
|
|
|
|
struct s3c_hwmon_chcfg *cfg;
|
|
|
|
|
|
|
|
cfg = pdata->in[sen_attr->index];
|
|
|
|
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%s\n", cfg->name);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* s3c_hwmon_create_attr - create hwmon attribute for given channel.
|
|
|
|
* @dev: The device to create the attribute on.
|
|
|
|
* @cfg: The channel configuration passed from the platform data.
|
|
|
|
* @channel: The ADC channel number to process.
|
|
|
|
*
|
|
|
|
* Create the scaled attribute for use with hwmon from the specified
|
|
|
|
* platform data in @pdata. The sysfs entry is handled by the routine
|
|
|
|
* s3c_hwmon_ch_show().
|
|
|
|
*
|
|
|
|
* The attribute name is taken from the configuration data if present
|
|
|
|
* otherwise the name is taken by concatenating in_ with the channel
|
|
|
|
* number.
|
|
|
|
*/
|
|
|
|
static int s3c_hwmon_create_attr(struct device *dev,
|
|
|
|
struct s3c_hwmon_chcfg *cfg,
|
|
|
|
struct s3c_hwmon_attr *attrs,
|
|
|
|
int channel)
|
|
|
|
{
|
|
|
|
struct sensor_device_attribute *attr;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
snprintf(attrs->in_name, sizeof(attrs->in_name), "in%d_input", channel);
|
|
|
|
|
|
|
|
attr = &attrs->in;
|
|
|
|
attr->index = channel;
|
2011-05-24 13:34:55 -06:00
|
|
|
sysfs_attr_init(&attr->dev_attr.attr);
|
2009-07-18 03:12:28 -06:00
|
|
|
attr->dev_attr.attr.name = attrs->in_name;
|
|
|
|
attr->dev_attr.attr.mode = S_IRUGO;
|
|
|
|
attr->dev_attr.show = s3c_hwmon_ch_show;
|
|
|
|
|
|
|
|
ret = device_create_file(dev, &attr->dev_attr);
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(dev, "failed to create input attribute\n");
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* if this has a name, add a label */
|
|
|
|
if (cfg->name) {
|
|
|
|
snprintf(attrs->label_name, sizeof(attrs->label_name),
|
|
|
|
"in%d_label", channel);
|
|
|
|
|
|
|
|
attr = &attrs->label;
|
|
|
|
attr->index = channel;
|
2011-05-24 13:34:55 -06:00
|
|
|
sysfs_attr_init(&attr->dev_attr.attr);
|
2009-07-18 03:12:28 -06:00
|
|
|
attr->dev_attr.attr.name = attrs->label_name;
|
|
|
|
attr->dev_attr.attr.mode = S_IRUGO;
|
|
|
|
attr->dev_attr.show = s3c_hwmon_label_show;
|
|
|
|
|
|
|
|
ret = device_create_file(dev, &attr->dev_attr);
|
|
|
|
if (ret < 0) {
|
|
|
|
device_remove_file(dev, &attrs->in.dev_attr);
|
|
|
|
dev_err(dev, "failed to create label attribute\n");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void s3c_hwmon_remove_attr(struct device *dev,
|
|
|
|
struct s3c_hwmon_attr *attrs)
|
|
|
|
{
|
|
|
|
device_remove_file(dev, &attrs->in.dev_attr);
|
|
|
|
device_remove_file(dev, &attrs->label.dev_attr);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* s3c_hwmon_probe - device probe entry.
|
|
|
|
* @dev: The device being probed.
|
|
|
|
*/
|
2012-11-19 11:22:35 -07:00
|
|
|
static int s3c_hwmon_probe(struct platform_device *dev)
|
2009-07-18 03:12:28 -06:00
|
|
|
{
|
|
|
|
struct s3c_hwmon_pdata *pdata = dev->dev.platform_data;
|
|
|
|
struct s3c_hwmon *hwmon;
|
|
|
|
int ret = 0;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (!pdata) {
|
|
|
|
dev_err(&dev->dev, "no platform data supplied\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2012-07-13 03:06:28 -06:00
|
|
|
hwmon = devm_kzalloc(&dev->dev, sizeof(struct s3c_hwmon), GFP_KERNEL);
|
2009-07-18 03:12:28 -06:00
|
|
|
if (hwmon == NULL) {
|
|
|
|
dev_err(&dev->dev, "no memory\n");
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
platform_set_drvdata(dev, hwmon);
|
|
|
|
|
2010-10-28 12:31:44 -06:00
|
|
|
mutex_init(&hwmon->lock);
|
2009-07-18 03:12:28 -06:00
|
|
|
|
|
|
|
/* Register with the core ADC driver. */
|
|
|
|
|
|
|
|
hwmon->client = s3c_adc_register(dev, NULL, NULL, 0);
|
|
|
|
if (IS_ERR(hwmon->client)) {
|
|
|
|
dev_err(&dev->dev, "cannot register adc\n");
|
2012-07-13 03:06:28 -06:00
|
|
|
return PTR_ERR(hwmon->client);
|
2009-07-18 03:12:28 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/* add attributes for our adc devices. */
|
|
|
|
|
|
|
|
ret = s3c_hwmon_add_raw(&dev->dev);
|
|
|
|
if (ret)
|
|
|
|
goto err_registered;
|
|
|
|
|
|
|
|
/* register with the hwmon core */
|
|
|
|
|
|
|
|
hwmon->hwmon_dev = hwmon_device_register(&dev->dev);
|
|
|
|
if (IS_ERR(hwmon->hwmon_dev)) {
|
|
|
|
dev_err(&dev->dev, "error registering with hwmon\n");
|
|
|
|
ret = PTR_ERR(hwmon->hwmon_dev);
|
|
|
|
goto err_raw_attribute;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < ARRAY_SIZE(pdata->in); i++) {
|
2009-12-09 12:35:45 -07:00
|
|
|
struct s3c_hwmon_chcfg *cfg = pdata->in[i];
|
2009-11-16 04:45:39 -07:00
|
|
|
|
|
|
|
if (!cfg)
|
2009-07-18 03:12:28 -06:00
|
|
|
continue;
|
|
|
|
|
2009-11-16 04:45:39 -07:00
|
|
|
if (cfg->mult >= 0x10000)
|
2009-07-18 03:12:28 -06:00
|
|
|
dev_warn(&dev->dev,
|
|
|
|
"channel %d multiplier too large\n",
|
|
|
|
i);
|
|
|
|
|
2009-12-09 12:35:45 -07:00
|
|
|
if (cfg->div == 0) {
|
2009-11-16 04:45:39 -07:00
|
|
|
dev_err(&dev->dev, "channel %d divider zero\n", i);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
2009-07-18 03:12:28 -06:00
|
|
|
ret = s3c_hwmon_create_attr(&dev->dev, pdata->in[i],
|
|
|
|
&hwmon->attrs[i], i);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(&dev->dev,
|
|
|
|
"error creating channel %d\n", i);
|
|
|
|
|
|
|
|
for (i--; i >= 0; i--)
|
|
|
|
s3c_hwmon_remove_attr(&dev->dev,
|
|
|
|
&hwmon->attrs[i]);
|
|
|
|
|
|
|
|
goto err_hwmon_register;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
err_hwmon_register:
|
|
|
|
hwmon_device_unregister(hwmon->hwmon_dev);
|
|
|
|
|
|
|
|
err_raw_attribute:
|
|
|
|
s3c_hwmon_remove_raw(&dev->dev);
|
|
|
|
|
|
|
|
err_registered:
|
|
|
|
s3c_adc_release(hwmon->client);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2012-11-19 11:25:51 -07:00
|
|
|
static int s3c_hwmon_remove(struct platform_device *dev)
|
2009-07-18 03:12:28 -06:00
|
|
|
{
|
|
|
|
struct s3c_hwmon *hwmon = platform_get_drvdata(dev);
|
|
|
|
int i;
|
|
|
|
|
|
|
|
s3c_hwmon_remove_raw(&dev->dev);
|
|
|
|
|
|
|
|
for (i = 0; i < ARRAY_SIZE(hwmon->attrs); i++)
|
|
|
|
s3c_hwmon_remove_attr(&dev->dev, &hwmon->attrs[i]);
|
|
|
|
|
|
|
|
hwmon_device_unregister(hwmon->hwmon_dev);
|
|
|
|
s3c_adc_release(hwmon->client);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct platform_driver s3c_hwmon_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "s3c-hwmon",
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
},
|
|
|
|
.probe = s3c_hwmon_probe,
|
2012-11-19 11:21:20 -07:00
|
|
|
.remove = s3c_hwmon_remove,
|
2009-07-18 03:12:28 -06:00
|
|
|
};
|
|
|
|
|
2011-11-25 00:31:00 -07:00
|
|
|
module_platform_driver(s3c_hwmon_driver);
|
2009-07-18 03:12:28 -06:00
|
|
|
|
|
|
|
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
|
|
|
|
MODULE_DESCRIPTION("S3C ADC HWMon driver");
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
MODULE_ALIAS("platform:s3c-hwmon");
|