ARM: HWMON: S3C24XX series ADC driver
Add support for the ADC controller on the S3C series of processors to drivers/hwmon for use with hardware monitoring systems. Signed-off-by: Ben Dooks <ben@simtec.co.uk> Acked-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Ben Dooks <ben-linux@fluff.org>hifive-unleashed-5.1
Ben Dooks
Ben Dooks
parent
e170adcb40
commit
bff78650a2
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@ -0,0 +1,41 @@
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/* linux/arch/arm/plat-s3c/include/plat/hwmon.h
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*
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* Copyright 2005 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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* http://armlinux.simtec.co.uk/
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*
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* S3C - HWMon interface for ADC
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARCH_ADC_HWMON_H
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#define __ASM_ARCH_ADC_HWMON_H __FILE__
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/**
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* s3c_hwmon_chcfg - channel configuration
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* @name: The name to give this channel.
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* @mult: Multiply the ADC value read by this.
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* @div: Divide the value from the ADC by this.
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*
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* The value read from the ADC is converted to a value that
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* hwmon expects (mV) by result = (value_read * @mult) / @div.
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*/
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struct s3c_hwmon_chcfg {
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const char *name;
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unsigned int mult;
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unsigned int div;
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};
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/**
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* s3c_hwmon_pdata - HWMON platform data
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* @in: One configuration for each possible channel used.
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*/
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struct s3c_hwmon_pdata {
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struct s3c_hwmon_chcfg *in[8];
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};
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#endif /* __ASM_ARCH_ADC_HWMON_H */
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@ -702,6 +702,23 @@ config SENSORS_SHT15
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This driver can also be built as a module. If so, the module
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will be called sht15.
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config SENSORS_S3C
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tristate "S3C24XX/S3C64XX Inbuilt ADC"
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depends on ARCH_S3C2410 || ARCH_S3C64XX
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help
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If you say yes here you get support for the on-board ADCs of
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the Samsung S3C24XX or S3C64XX series of SoC
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This driver can also be built as a module. If so, the module
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will be called s3c-hwmo.
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config SENSORS_S3C_RAW
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bool "Include raw channel attributes in sysfs"
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depends on SENSORS_S3C
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help
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Say Y here if you want to include raw copies of all the ADC
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channels in sysfs.
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config SENSORS_SIS5595
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tristate "Silicon Integrated Systems Corp. SiS5595"
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depends on PCI
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@ -76,6 +76,7 @@ obj-$(CONFIG_SENSORS_MAX6650) += max6650.o
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obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
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obj-$(CONFIG_SENSORS_PC87427) += pc87427.o
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obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
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obj-$(CONFIG_SENSORS_S3C) += s3c-hwmon.o
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obj-$(CONFIG_SENSORS_SHT15) += sht15.o
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obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o
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obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o
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@ -0,0 +1,405 @@
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/* linux/drivers/hwmon/s3c-hwmon.c
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*
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* Copyright (C) 2005, 2008, 2009 Simtec Electronics
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* http://armlinux.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C24XX/S3C64XX ADC hwmon support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <plat/adc.h>
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#include <plat/hwmon.h>
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struct s3c_hwmon_attr {
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struct sensor_device_attribute in;
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struct sensor_device_attribute label;
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char in_name[12];
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char label_name[12];
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};
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/**
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* struct s3c_hwmon - ADC hwmon client information
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* @lock: Access lock to serialise the conversions.
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* @client: The client we registered with the S3C ADC core.
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* @hwmon_dev: The hwmon device we created.
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* @attr: The holders for the channel attributes.
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*/
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struct s3c_hwmon {
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struct semaphore lock;
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struct s3c_adc_client *client;
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struct device *hwmon_dev;
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struct s3c_hwmon_attr attrs[8];
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};
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/**
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* s3c_hwmon_read_ch - read a value from a given adc channel.
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* @dev: The device.
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* @hwmon: Our state.
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* @channel: The channel we're reading from.
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*
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* Read a value from the @channel with the proper locking and sleep until
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* either the read completes or we timeout awaiting the ADC core to get
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* back to us.
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*/
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static int s3c_hwmon_read_ch(struct device *dev,
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struct s3c_hwmon *hwmon, int channel)
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{
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int ret;
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ret = down_interruptible(&hwmon->lock);
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if (ret < 0)
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return ret;
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dev_dbg(dev, "reading channel %d\n", channel);
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ret = s3c_adc_read(hwmon->client, channel);
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up(&hwmon->lock);
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return ret;
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}
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#ifdef CONFIG_SENSORS_S3C_RAW
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/**
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* s3c_hwmon_show_raw - show a conversion from the raw channel number.
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* @dev: The device that the attribute belongs to.
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* @attr: The attribute being read.
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* @buf: The result buffer.
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*
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* This show deals with the raw attribute, registered for each possible
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* ADC channel. This does a conversion and returns the raw (un-scaled)
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* value returned from the hardware.
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*/
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static ssize_t s3c_hwmon_show_raw(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct s3c_hwmon *adc = platform_get_drvdata(to_platform_device(dev));
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struct sensor_device_attribute *sa = to_sensor_dev_attr(attr);
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int ret;
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ret = s3c_hwmon_read_ch(dev, adc, sa->index);
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return (ret < 0) ? ret : snprintf(buf, PAGE_SIZE, "%d\n", ret);
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}
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#define DEF_ADC_ATTR(x) \
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static SENSOR_DEVICE_ATTR(adc##x##_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, x)
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DEF_ADC_ATTR(0);
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DEF_ADC_ATTR(1);
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DEF_ADC_ATTR(2);
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DEF_ADC_ATTR(3);
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DEF_ADC_ATTR(4);
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DEF_ADC_ATTR(5);
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DEF_ADC_ATTR(6);
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DEF_ADC_ATTR(7);
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static struct attribute *s3c_hwmon_attrs[9] = {
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&sensor_dev_attr_adc0_raw.dev_attr.attr,
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&sensor_dev_attr_adc1_raw.dev_attr.attr,
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&sensor_dev_attr_adc2_raw.dev_attr.attr,
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&sensor_dev_attr_adc3_raw.dev_attr.attr,
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&sensor_dev_attr_adc4_raw.dev_attr.attr,
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&sensor_dev_attr_adc5_raw.dev_attr.attr,
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&sensor_dev_attr_adc6_raw.dev_attr.attr,
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&sensor_dev_attr_adc7_raw.dev_attr.attr,
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NULL,
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};
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static struct attribute_group s3c_hwmon_attrgroup = {
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.attrs = s3c_hwmon_attrs,
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};
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static inline int s3c_hwmon_add_raw(struct device *dev)
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{
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return sysfs_create_group(&dev->kobj, &s3c_hwmon_attrgroup);
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}
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static inline void s3c_hwmon_remove_raw(struct device *dev)
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{
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sysfs_remove_group(&dev->kobj, &s3c_hwmon_attrgroup);
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}
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#else
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static inline int s3c_hwmon_add_raw(struct device *dev) { return 0; }
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static inline void s3c_hwmon_remove_raw(struct device *dev) { }
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#endif /* CONFIG_SENSORS_S3C_RAW */
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/**
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* s3c_hwmon_ch_show - show value of a given channel
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* @dev: The device that the attribute belongs to.
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* @attr: The attribute being read.
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* @buf: The result buffer.
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*
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* Read a value from the ADC and scale it before returning it to the
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* caller. The scale factor is gained from the channel configuration
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* passed via the platform data when the device was registered.
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*/
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static ssize_t s3c_hwmon_ch_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct sensor_device_attribute *sen_attr = to_sensor_dev_attr(attr);
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struct s3c_hwmon *hwmon = platform_get_drvdata(to_platform_device(dev));
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struct s3c_hwmon_pdata *pdata = dev->platform_data;
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struct s3c_hwmon_chcfg *cfg;
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int ret;
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cfg = pdata->in[sen_attr->index];
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ret = s3c_hwmon_read_ch(dev, hwmon, sen_attr->index);
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if (ret < 0)
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return ret;
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ret *= cfg->mult;
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ret = DIV_ROUND_CLOSEST(ret, cfg->div);
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return snprintf(buf, PAGE_SIZE, "%d\n", ret);
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}
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/**
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* s3c_hwmon_label_show - show label name of the given channel.
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* @dev: The device that the attribute belongs to.
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* @attr: The attribute being read.
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* @buf: The result buffer.
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*
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* Return the label name of a given channel
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*/
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static ssize_t s3c_hwmon_label_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct sensor_device_attribute *sen_attr = to_sensor_dev_attr(attr);
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struct s3c_hwmon_pdata *pdata = dev->platform_data;
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struct s3c_hwmon_chcfg *cfg;
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cfg = pdata->in[sen_attr->index];
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return snprintf(buf, PAGE_SIZE, "%s\n", cfg->name);
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}
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/**
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* s3c_hwmon_create_attr - create hwmon attribute for given channel.
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* @dev: The device to create the attribute on.
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* @cfg: The channel configuration passed from the platform data.
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* @channel: The ADC channel number to process.
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*
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* Create the scaled attribute for use with hwmon from the specified
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* platform data in @pdata. The sysfs entry is handled by the routine
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* s3c_hwmon_ch_show().
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*
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* The attribute name is taken from the configuration data if present
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* otherwise the name is taken by concatenating in_ with the channel
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* number.
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*/
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static int s3c_hwmon_create_attr(struct device *dev,
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struct s3c_hwmon_chcfg *cfg,
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struct s3c_hwmon_attr *attrs,
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int channel)
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{
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struct sensor_device_attribute *attr;
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int ret;
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snprintf(attrs->in_name, sizeof(attrs->in_name), "in%d_input", channel);
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attr = &attrs->in;
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attr->index = channel;
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attr->dev_attr.attr.name = attrs->in_name;
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attr->dev_attr.attr.mode = S_IRUGO;
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attr->dev_attr.attr.owner = THIS_MODULE;
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attr->dev_attr.show = s3c_hwmon_ch_show;
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ret = device_create_file(dev, &attr->dev_attr);
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if (ret < 0) {
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dev_err(dev, "failed to create input attribute\n");
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return ret;
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}
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/* if this has a name, add a label */
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if (cfg->name) {
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snprintf(attrs->label_name, sizeof(attrs->label_name),
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"in%d_label", channel);
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attr = &attrs->label;
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attr->index = channel;
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attr->dev_attr.attr.name = attrs->label_name;
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attr->dev_attr.attr.mode = S_IRUGO;
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attr->dev_attr.attr.owner = THIS_MODULE;
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attr->dev_attr.show = s3c_hwmon_label_show;
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ret = device_create_file(dev, &attr->dev_attr);
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if (ret < 0) {
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device_remove_file(dev, &attrs->in.dev_attr);
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dev_err(dev, "failed to create label attribute\n");
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}
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}
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return ret;
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}
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static void s3c_hwmon_remove_attr(struct device *dev,
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struct s3c_hwmon_attr *attrs)
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{
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device_remove_file(dev, &attrs->in.dev_attr);
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device_remove_file(dev, &attrs->label.dev_attr);
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}
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/**
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* s3c_hwmon_probe - device probe entry.
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* @dev: The device being probed.
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*/
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static int __devinit s3c_hwmon_probe(struct platform_device *dev)
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{
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struct s3c_hwmon_pdata *pdata = dev->dev.platform_data;
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struct s3c_hwmon *hwmon;
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int ret = 0;
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int i;
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if (!pdata) {
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dev_err(&dev->dev, "no platform data supplied\n");
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return -EINVAL;
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}
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hwmon = kzalloc(sizeof(struct s3c_hwmon), GFP_KERNEL);
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if (hwmon == NULL) {
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dev_err(&dev->dev, "no memory\n");
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return -ENOMEM;
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}
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platform_set_drvdata(dev, hwmon);
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init_MUTEX(&hwmon->lock);
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/* Register with the core ADC driver. */
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hwmon->client = s3c_adc_register(dev, NULL, NULL, 0);
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if (IS_ERR(hwmon->client)) {
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dev_err(&dev->dev, "cannot register adc\n");
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ret = PTR_ERR(hwmon->client);
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goto err_mem;
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}
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/* add attributes for our adc devices. */
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ret = s3c_hwmon_add_raw(&dev->dev);
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if (ret)
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goto err_registered;
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/* register with the hwmon core */
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hwmon->hwmon_dev = hwmon_device_register(&dev->dev);
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if (IS_ERR(hwmon->hwmon_dev)) {
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dev_err(&dev->dev, "error registering with hwmon\n");
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ret = PTR_ERR(hwmon->hwmon_dev);
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goto err_raw_attribute;
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}
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for (i = 0; i < ARRAY_SIZE(pdata->in); i++) {
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if (!pdata->in[i])
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continue;
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if (pdata->in[i]->mult >= 0x10000)
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dev_warn(&dev->dev,
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"channel %d multiplier too large\n",
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i);
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ret = s3c_hwmon_create_attr(&dev->dev, pdata->in[i],
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&hwmon->attrs[i], i);
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if (ret) {
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dev_err(&dev->dev,
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"error creating channel %d\n", i);
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for (i--; i >= 0; i--)
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s3c_hwmon_remove_attr(&dev->dev,
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&hwmon->attrs[i]);
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goto err_hwmon_register;
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}
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}
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return 0;
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err_hwmon_register:
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hwmon_device_unregister(hwmon->hwmon_dev);
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err_raw_attribute:
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s3c_hwmon_remove_raw(&dev->dev);
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err_registered:
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s3c_adc_release(hwmon->client);
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err_mem:
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kfree(hwmon);
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return ret;
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}
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static int __devexit s3c_hwmon_remove(struct platform_device *dev)
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{
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struct s3c_hwmon *hwmon = platform_get_drvdata(dev);
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int i;
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s3c_hwmon_remove_raw(&dev->dev);
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for (i = 0; i < ARRAY_SIZE(hwmon->attrs); i++)
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s3c_hwmon_remove_attr(&dev->dev, &hwmon->attrs[i]);
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hwmon_device_unregister(hwmon->hwmon_dev);
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s3c_adc_release(hwmon->client);
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return 0;
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}
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static struct platform_driver s3c_hwmon_driver = {
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.driver = {
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.name = "s3c-hwmon",
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.owner = THIS_MODULE,
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},
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||||
.probe = s3c_hwmon_probe,
|
||||
.remove = __devexit_p(s3c_hwmon_remove),
|
||||
};
|
||||
|
||||
static int __init s3c_hwmon_init(void)
|
||||
{
|
||||
return platform_driver_register(&s3c_hwmon_driver);
|
||||
}
|
||||
|
||||
static void __exit s3c_hwmon_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&s3c_hwmon_driver);
|
||||
}
|
||||
|
||||
module_init(s3c_hwmon_init);
|
||||
module_exit(s3c_hwmon_exit);
|
||||
|
||||
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
|
||||
MODULE_DESCRIPTION("S3C ADC HWMon driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_ALIAS("platform:s3c-hwmon");
|
||||
Loading…
Reference in New Issue