Commit 7f983ba9 authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Ralf Baechle

HWMON: Add JZ4740 ADC driver

Add support for reading the ADCIN pin of the ADC unit on JZ4740 SoCs.
Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Cc: lm-sensors@lm-sensors.org
Acked-by: default avatarJean Delvare <khali@linux-fr.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1425/Signed-off-by: default avatarAxel Lin <axel.lin@gmail.com>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 2249071b
......@@ -446,6 +446,16 @@ config SENSORS_IT87
This driver can also be built as a module. If so, the module
will be called it87.
config SENSORS_JZ4740
tristate "Ingenic JZ4740 SoC ADC driver"
depends on MACH_JZ4740 && MFD_JZ4740_ADC
help
If you say yes here you get support for reading adc values from the ADCIN
pin on Ingenic JZ4740 SoC based boards.
This driver can also be build as a module. If so, the module will be
called jz4740-hwmon.
config SENSORS_LM63
tristate "National Semiconductor LM63 and LM64"
depends on I2C
......
......@@ -55,6 +55,7 @@ obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o
obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o
obj-$(CONFIG_SENSORS_IBMPEX) += ibmpex.o
obj-$(CONFIG_SENSORS_IT87) += it87.o
obj-$(CONFIG_SENSORS_JZ4740) += jz4740-hwmon.o
obj-$(CONFIG_SENSORS_K8TEMP) += k8temp.o
obj-$(CONFIG_SENSORS_K10TEMP) += k10temp.o
obj-$(CONFIG_SENSORS_LIS3LV02D) += lis3lv02d.o hp_accel.o
......
/*
* 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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