a912e80bd0
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 35 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Armijn Hemel <armijn@tjaldur.nl> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.655028468@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
136 lines
2.9 KiB
C
136 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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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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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hwmon->base = devm_platform_ioremap_resource(pdev, 0);
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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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