[PATCH] RTC subsystem: EP93XX driver (fd507e2f) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/rtc/Kconfig

+11 −0

Original line number	Original line	Diff line number	Diff line
	@@ -117,6 +117,17 @@ config RTC_DRV_RS5C372
	This driver can also be built as a module. If so, the module		This driver can also be built as a module. If so, the module
	will be called rtc-rs5c372.		will be called rtc-rs5c372.

			config RTC_DRV_EP93XX
			tristate "Cirrus Logic EP93XX"
			depends on RTC_CLASS && ARCH_EP93XX
			help
			If you say yes here you get support for the
			RTC embedded in the Cirrus Logic EP93XX processors.

			This driver can also be built as a module. If so, the module
			will be called rtc-ep93xx.


	config RTC_DRV_TEST		config RTC_DRV_TEST
	tristate "Test driver/device"		tristate "Test driver/device"
	depends on RTC_CLASS		depends on RTC_CLASS

drivers/rtc/Makefile

+1 −1

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	@@ -16,4 +16,4 @@ obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o
	obj-$(CONFIG_RTC_DRV_DS1672) += rtc-ds1672.o		obj-$(CONFIG_RTC_DRV_DS1672) += rtc-ds1672.o
	obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o		obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o
	obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o		obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o
			obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o

drivers/rtc/rtc-ep93xx.c

0 → 100644

+162 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* A driver for the RTC embedded in the Cirrus Logic EP93XX processors
			* Copyright (c) 2006 Tower Technologies
			*
			* Author: Alessandro Zummo <a.zummo@towertech.it>
			*
			* This program is free software; you can redistribute it and/or modify
			* it under the terms of the GNU General Public License version 2 as
			* published by the Free Software Foundation.
			*/

			#include <linux/module.h>
			#include <linux/rtc.h>
			#include <linux/platform_device.h>
			#include <asm/hardware.h>

			#define EP93XX_RTC_REG(x) (EP93XX_RTC_BASE + (x))
			#define EP93XX_RTC_DATA EP93XX_RTC_REG(0x0000)
			#define EP93XX_RTC_LOAD EP93XX_RTC_REG(0x000C)
			#define EP93XX_RTC_SWCOMP EP93XX_RTC_REG(0x0108)

			#define DRV_VERSION "0.2"

			static int ep93xx_get_swcomp(struct device dev, unsigned short preload,
			unsigned short *delete)
			{
			unsigned short comp = __raw_readl(EP93XX_RTC_SWCOMP);

			if (preload)
			*preload = comp & 0xffff;

			if (delete)
			*delete = (comp >> 16) & 0x1f;

			return 0;
			}

			static int ep93xx_rtc_read_time(struct device dev, struct rtc_time tm)
			{
			unsigned long time = __raw_readl(EP93XX_RTC_DATA);

			rtc_time_to_tm(time, tm);
			return 0;
			}

			static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs)
			{
			__raw_writel(secs + 1, EP93XX_RTC_LOAD);
			return 0;
			}

			static int ep93xx_rtc_set_time(struct device dev, struct rtc_time tm)
			{
			int err;
			unsigned long secs;

			err = rtc_tm_to_time(tm, &secs);
			if (err != 0)
			return err;

			return ep93xx_rtc_set_mmss(dev, secs);
			}

			static int ep93xx_rtc_proc(struct device dev, struct seq_file seq)
			{
			unsigned short preload, delete;

			ep93xx_get_swcomp(dev, &preload, &delete);

			seq_printf(seq, "24hr\t\t: yes\n");
			seq_printf(seq, "preload\t\t: %d\n", preload);
			seq_printf(seq, "delete\t\t: %d\n", delete);

			return 0;
			}

			static struct rtc_class_ops ep93xx_rtc_ops = {
			.read_time = ep93xx_rtc_read_time,
			.set_time = ep93xx_rtc_set_time,
			.set_mmss = ep93xx_rtc_set_mmss,
			.proc = ep93xx_rtc_proc,
			};

			static ssize_t ep93xx_sysfs_show_comp_preload(struct device *dev,
			struct device_attribute attr, char buf)
			{
			unsigned short preload;

			ep93xx_get_swcomp(dev, &preload, NULL);

			return sprintf(buf, "%d\n", preload);
			}
			static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_sysfs_show_comp_preload, NULL);

			static ssize_t ep93xx_sysfs_show_comp_delete(struct device *dev,
			struct device_attribute attr, char buf)
			{
			unsigned short delete;

			ep93xx_get_swcomp(dev, NULL, &delete);

			return sprintf(buf, "%d\n", delete);
			}
			static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_sysfs_show_comp_delete, NULL);


			static int __devinit ep93xx_rtc_probe(struct platform_device *dev)
			{
			struct rtc_device *rtc = rtc_device_register("ep93xx",
			&dev->dev, &ep93xx_rtc_ops, THIS_MODULE);

			if (IS_ERR(rtc)) {
			dev_err(&dev->dev, "unable to register\n");
			return PTR_ERR(rtc);
			}

			platform_set_drvdata(dev, rtc);

			device_create_file(&dev->dev, &dev_attr_comp_preload);
			device_create_file(&dev->dev, &dev_attr_comp_delete);

			return 0;
			}

			static int __devexit ep93xx_rtc_remove(struct platform_device *dev)
			{
			struct rtc_device *rtc = platform_get_drvdata(dev);

			if (rtc)
			rtc_device_unregister(rtc);

			platform_set_drvdata(dev, NULL);

			return 0;
			}

			static struct platform_driver ep93xx_rtc_platform_driver = {
			.driver = {
			.name = "ep93xx-rtc",
			.owner = THIS_MODULE,
			},
			.probe = ep93xx_rtc_probe,
			.remove = __devexit_p(ep93xx_rtc_remove),
			};

			static int __init ep93xx_rtc_init(void)
			{
			return platform_driver_register(&ep93xx_rtc_platform_driver);
			}

			static void __exit ep93xx_rtc_exit(void)
			{
			platform_driver_unregister(&ep93xx_rtc_platform_driver);
			}

			MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
			MODULE_DESCRIPTION("EP93XX RTC driver");
			MODULE_LICENSE("GPL");
			MODULE_VERSION(DRV_VERSION);

			module_init(ep93xx_rtc_init);
			module_exit(ep93xx_rtc_exit);