![Jingoo Han](/assets/img/avatar_default.png)
devm_rtc_device_register() is device managed and makes cleanup paths simpler. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
200 lines
4.9 KiB
C
200 lines
4.9 KiB
C
/*
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* A driver for the RTC embedded in the Cirrus Logic EP93XX processors
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* Copyright (c) 2006 Tower Technologies
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*
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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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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#include <linux/module.h>
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#include <linux/rtc.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/gfp.h>
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#define EP93XX_RTC_DATA 0x000
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#define EP93XX_RTC_MATCH 0x004
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#define EP93XX_RTC_STATUS 0x008
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#define EP93XX_RTC_STATUS_INTR (1<<0)
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#define EP93XX_RTC_LOAD 0x00C
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#define EP93XX_RTC_CONTROL 0x010
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#define EP93XX_RTC_CONTROL_MIE (1<<0)
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#define EP93XX_RTC_SWCOMP 0x108
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#define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000
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#define EP93XX_RTC_SWCOMP_DEL_SHIFT 16
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#define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff
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#define EP93XX_RTC_SWCOMP_INT_SHIFT 0
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#define DRV_VERSION "0.3"
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/*
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* struct device dev.platform_data is used to store our private data
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* because struct rtc_device does not have a variable to hold it.
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*/
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struct ep93xx_rtc {
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void __iomem *mmio_base;
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struct rtc_device *rtc;
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};
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static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload,
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unsigned short *delete)
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{
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struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
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unsigned long comp;
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comp = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP);
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if (preload)
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*preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK)
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>> EP93XX_RTC_SWCOMP_INT_SHIFT;
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if (delete)
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*delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK)
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>> EP93XX_RTC_SWCOMP_DEL_SHIFT;
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return 0;
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}
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static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
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unsigned long time;
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time = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA);
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rtc_time_to_tm(time, tm);
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return 0;
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}
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static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs)
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{
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struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
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__raw_writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD);
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return 0;
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}
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static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq)
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{
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unsigned short preload, delete;
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ep93xx_rtc_get_swcomp(dev, &preload, &delete);
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seq_printf(seq, "preload\t\t: %d\n", preload);
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seq_printf(seq, "delete\t\t: %d\n", delete);
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return 0;
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}
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static const struct rtc_class_ops ep93xx_rtc_ops = {
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.read_time = ep93xx_rtc_read_time,
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.set_mmss = ep93xx_rtc_set_mmss,
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.proc = ep93xx_rtc_proc,
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};
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static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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unsigned short preload;
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ep93xx_rtc_get_swcomp(dev, &preload, NULL);
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return sprintf(buf, "%d\n", preload);
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}
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static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL);
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static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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unsigned short delete;
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ep93xx_rtc_get_swcomp(dev, NULL, &delete);
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return sprintf(buf, "%d\n", delete);
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}
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static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL);
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static struct attribute *ep93xx_rtc_attrs[] = {
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&dev_attr_comp_preload.attr,
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&dev_attr_comp_delete.attr,
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NULL
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};
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static const struct attribute_group ep93xx_rtc_sysfs_files = {
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.attrs = ep93xx_rtc_attrs,
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};
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static int ep93xx_rtc_probe(struct platform_device *pdev)
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{
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struct ep93xx_rtc *ep93xx_rtc;
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struct resource *res;
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int err;
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ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL);
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if (!ep93xx_rtc)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENXIO;
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if (!devm_request_mem_region(&pdev->dev, res->start,
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resource_size(res), pdev->name))
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return -EBUSY;
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ep93xx_rtc->mmio_base = devm_ioremap(&pdev->dev, res->start,
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resource_size(res));
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if (!ep93xx_rtc->mmio_base)
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return -ENXIO;
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pdev->dev.platform_data = ep93xx_rtc;
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platform_set_drvdata(pdev, ep93xx_rtc);
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ep93xx_rtc->rtc = devm_rtc_device_register(&pdev->dev,
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pdev->name, &ep93xx_rtc_ops, THIS_MODULE);
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if (IS_ERR(ep93xx_rtc->rtc)) {
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err = PTR_ERR(ep93xx_rtc->rtc);
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goto exit;
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}
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err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
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if (err)
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goto exit;
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return 0;
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exit:
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platform_set_drvdata(pdev, NULL);
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pdev->dev.platform_data = NULL;
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return err;
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}
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static int ep93xx_rtc_remove(struct platform_device *pdev)
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{
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sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
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platform_set_drvdata(pdev, NULL);
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pdev->dev.platform_data = NULL;
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return 0;
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}
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static struct platform_driver ep93xx_rtc_driver = {
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.driver = {
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.name = "ep93xx-rtc",
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.owner = THIS_MODULE,
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},
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.probe = ep93xx_rtc_probe,
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.remove = ep93xx_rtc_remove,
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};
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module_platform_driver(ep93xx_rtc_driver);
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MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
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MODULE_DESCRIPTION("EP93XX RTC driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_VERSION);
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MODULE_ALIAS("platform:ep93xx-rtc");
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