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https://github.com/edk2-porting/linux-next.git
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abf04402b6
Use DEVICE_ATTR_RO for read-only attributes. This simplifies the source code, improves readbility, and reduces the chance of inconsistencies. The conversion was done automatically using coccinelle. It was validated by compiling both the old and the new source code and comparing its text, data, and bss size. Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> [groeck: Updated description] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
147 lines
3.4 KiB
C
147 lines
3.4 KiB
C
/*
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* Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
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* JZ4740 SoC HWMON driver
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/completion.h>
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#include <linux/mfd/core.h>
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#include <linux/hwmon.h>
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struct jz4740_hwmon {
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void __iomem *base;
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int irq;
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const struct mfd_cell *cell;
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struct platform_device *pdev;
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struct completion read_completion;
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struct mutex lock;
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};
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static irqreturn_t jz4740_hwmon_irq(int irq, void *data)
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{
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struct jz4740_hwmon *hwmon = data;
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complete(&hwmon->read_completion);
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return IRQ_HANDLED;
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}
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static ssize_t in0_input_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct jz4740_hwmon *hwmon = dev_get_drvdata(dev);
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struct platform_device *pdev = hwmon->pdev;
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struct completion *completion = &hwmon->read_completion;
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long t;
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unsigned long val;
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int ret;
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mutex_lock(&hwmon->lock);
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reinit_completion(completion);
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enable_irq(hwmon->irq);
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hwmon->cell->enable(pdev);
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t = wait_for_completion_interruptible_timeout(completion, HZ);
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if (t > 0) {
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val = readw(hwmon->base) & 0xfff;
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val = (val * 3300) >> 12;
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ret = sprintf(buf, "%lu\n", val);
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} else {
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ret = t ? t : -ETIMEDOUT;
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}
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hwmon->cell->disable(pdev);
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disable_irq(hwmon->irq);
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mutex_unlock(&hwmon->lock);
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return ret;
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}
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static DEVICE_ATTR_RO(in0_input);
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static struct attribute *jz4740_attrs[] = {
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&dev_attr_in0_input.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(jz4740);
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static int jz4740_hwmon_probe(struct platform_device *pdev)
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{
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int ret;
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struct device *dev = &pdev->dev;
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struct jz4740_hwmon *hwmon;
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struct device *hwmon_dev;
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struct resource *mem;
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hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL);
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if (!hwmon)
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return -ENOMEM;
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hwmon->cell = mfd_get_cell(pdev);
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hwmon->irq = platform_get_irq(pdev, 0);
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if (hwmon->irq < 0) {
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dev_err(&pdev->dev, "Failed to get platform irq: %d\n",
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hwmon->irq);
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return hwmon->irq;
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}
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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hwmon->base = devm_ioremap_resource(&pdev->dev, mem);
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if (IS_ERR(hwmon->base))
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return PTR_ERR(hwmon->base);
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hwmon->pdev = pdev;
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init_completion(&hwmon->read_completion);
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mutex_init(&hwmon->lock);
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ret = devm_request_irq(dev, hwmon->irq, jz4740_hwmon_irq, 0,
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pdev->name, hwmon);
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if (ret) {
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dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
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return ret;
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}
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disable_irq(hwmon->irq);
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, "jz4740", hwmon,
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jz4740_groups);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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}
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static struct platform_driver jz4740_hwmon_driver = {
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.probe = jz4740_hwmon_probe,
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.driver = {
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.name = "jz4740-hwmon",
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},
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};
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module_platform_driver(jz4740_hwmon_driver);
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MODULE_DESCRIPTION("JZ4740 SoC HWMON driver");
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:jz4740-hwmon");
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