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/*
* Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
* JZ4740 SoC HWMON driver
*
* 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.
*
* 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/err.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/completion.h>
#include <linux/mfd/core.h>
#include <linux/hwmon.h>
struct jz4740_hwmon {
struct resource *mem;
void __iomem *base;
int irq;
struct mfd_cell *cell;
struct device *hwmon;
struct completion read_completion;
struct mutex lock;
};
static ssize_t jz4740_hwmon_show_name(struct device *dev,
struct device_attribute *dev_attr, char *buf)
{
return sprintf(buf, "jz4740\n");
}
static irqreturn_t jz4740_hwmon_irq(int irq, void *data)
{
struct jz4740_hwmon *hwmon = data;
complete(&hwmon->read_completion);
return IRQ_HANDLED;
}
static ssize_t jz4740_hwmon_read_adcin(struct device *dev,
struct device_attribute *dev_attr, char *buf)
{
struct jz4740_hwmon *hwmon = dev_get_drvdata(dev);
struct completion *completion = &hwmon->read_completion;
unsigned long t;
unsigned long val;
int ret;
mutex_lock(&hwmon->lock);
INIT_COMPLETION(*completion);
enable_irq(hwmon->irq);
hwmon->cell->enable(to_platform_device(dev));
t = wait_for_completion_interruptible_timeout(completion, HZ);
if (t > 0) {
val = readw(hwmon->base) & 0xfff;
val = (val * 3300) >> 12;
ret = sprintf(buf, "%lu\n", val);
} else {
ret = t ? t : -ETIMEDOUT;
}
hwmon->cell->disable(to_platform_device(dev));
disable_irq(hwmon->irq);
mutex_unlock(&hwmon->lock);
return ret;
}
static DEVICE_ATTR(name, S_IRUGO, jz4740_hwmon_show_name, NULL);
static DEVICE_ATTR(in0_input, S_IRUGO, jz4740_hwmon_read_adcin, NULL);
static struct attribute *jz4740_hwmon_attributes[] = {
&dev_attr_name.attr,
&dev_attr_in0_input.attr,
NULL
};
static const struct attribute_group jz4740_hwmon_attr_group = {
.attrs = jz4740_hwmon_attributes,
};
static int __devinit jz4740_hwmon_probe(struct platform_device *pdev)
{
int ret;
struct jz4740_hwmon *hwmon;
hwmon = kmalloc(sizeof(*hwmon), GFP_KERNEL);
if (!hwmon) {
dev_err(&pdev->dev, "Failed to allocate driver structure\n");
return -ENOMEM;
}
hwmon->cell = pdev->dev.platform_data;
hwmon->irq = platform_get_irq(pdev, 0);
if (hwmon->irq < 0) {
ret = hwmon->irq;
dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
goto err_free;
}
hwmon->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!hwmon->mem) {
ret = -ENOENT;
dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
goto err_free;
}
hwmon->mem = request_mem_region(hwmon->mem->start,
resource_size(hwmon->mem), pdev->name);
if (!hwmon->mem) {
ret = -EBUSY;
dev_err(&pdev->dev, "Failed to request mmio memory region\n");
goto err_free;
}
hwmon->base = ioremap_nocache(hwmon->mem->start,
resource_size(hwmon->mem));
if (!hwmon->base) {
ret = -EBUSY;
dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
goto err_release_mem_region;
}
init_completion(&hwmon->read_completion);
mutex_init(&hwmon->lock);
platform_set_drvdata(pdev, hwmon);
ret = request_irq(hwmon->irq, jz4740_hwmon_irq, 0, pdev->name, hwmon);
if (ret) {
dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
goto err_iounmap;
}
disable_irq(hwmon->irq);
ret = sysfs_create_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
if (ret) {
dev_err(&pdev->dev, "Failed to create sysfs group: %d\n", ret);
goto err_free_irq;
}
hwmon->hwmon = hwmon_device_register(&pdev->dev);
if (IS_ERR(hwmon->hwmon)) {
ret = PTR_ERR(hwmon->hwmon);
goto err_remove_file;
}
return 0;
err_remove_file:
sysfs_remove_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
err_free_irq:
free_irq(hwmon->irq, hwmon);
err_iounmap:
platform_set_drvdata(pdev, NULL);
iounmap(hwmon->base);
err_release_mem_region:
release_mem_region(hwmon->mem->start, resource_size(hwmon->mem));
err_free:
kfree(hwmon);
return ret;
}
static int __devexit jz4740_hwmon_remove(struct platform_device *pdev)
{
struct jz4740_hwmon *hwmon = platform_get_drvdata(pdev);
hwmon_device_unregister(hwmon->hwmon);
sysfs_remove_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
free_irq(hwmon->irq, hwmon);
iounmap(hwmon->base);
release_mem_region(hwmon->mem->start, resource_size(hwmon->mem));
platform_set_drvdata(pdev, NULL);
kfree(hwmon);
return 0;
}
struct platform_driver jz4740_hwmon_driver = {
.probe = jz4740_hwmon_probe,
.remove = __devexit_p(jz4740_hwmon_remove),
.driver = {
.name = "jz4740-hwmon",
.owner = THIS_MODULE,
},
};
static int __init jz4740_hwmon_init(void)
{
return platform_driver_register(&jz4740_hwmon_driver);
}
module_init(jz4740_hwmon_init);
static void __exit jz4740_hwmon_exit(void)
{
platform_driver_unregister(&jz4740_hwmon_driver);
}
module_exit(jz4740_hwmon_exit);
MODULE_DESCRIPTION("JZ4740 SoC HWMON driver");
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:jz4740-hwmon");
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