drivers/rtc/rtc-msm7x00a.c - kernel/msm.git - Git at Google

 /* drivers/rtc/rtc-msm7x00a.c
  *
  * Copyright (C) 2008 Google, Inc.
  * Author: San Mehat <san@google.com>
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  */

 #include <linux/module.h>
 #include <linux/version.h>

 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/rtc.h>
 #include <linux/msm_rpcrouter.h>

 #include <mach/msm_rpcrouter.h>

 #define RTC_DEBUG 0

 extern void msm_pm_set_max_sleep_time(int64_t sleep_time_ns);

 #if CONFIG_MSM_AMSS_VERSION >= 6350 || defined(CONFIG_ARCH_QSD8X50)
 #define APP_TIMEREMOTE_PDEV_NAME "rs30000048:00010000"
 #else
 #define APP_TIMEREMOTE_PDEV_NAME "rs30000048:0da5b528"
 #endif

 #define TIMEREMOTE_PROCEEDURE_SET_JULIAN	6
 #define TIMEREMOTE_PROCEEDURE_GET_JULIAN	7

 struct rpc_time_julian {
 	uint32_t year;
 	uint32_t month;
 	uint32_t day;
 	uint32_t hour;
 	uint32_t minute;
 	uint32_t second;
 	uint32_t day_of_week;
 };

 static struct msm_rpc_endpoint *ep;
 static struct rtc_device *rtc;
 static unsigned long rtcalarm_time;

 static int
 msmrtc_timeremote_set_time(struct device *dev, struct rtc_time *tm)
 {
 	int rc;

 	struct timeremote_set_julian_req {
 		struct rpc_request_hdr hdr;
 		uint32_t opt_arg;

 		struct rpc_time_julian time;
 	} req;

 	struct timeremote_set_julian_rep {
 		struct rpc_reply_hdr hdr;
 	} rep;

 	if (tm->tm_year < 1900)
 		tm->tm_year += 1900;

 	if (tm->tm_year < 1970)
 		return -EINVAL;

 #if RTC_DEBUG
 	printk(KERN_DEBUG "%s: %.2u/%.2u/%.4u %.2u:%.2u:%.2u (%.2u)\n",
 	       __func__, tm->tm_mon, tm->tm_mday, tm->tm_year,
 	       tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
 #endif

 	req.opt_arg = cpu_to_be32(1);
 	req.time.year = cpu_to_be32(tm->tm_year);
 	req.time.month = cpu_to_be32(tm->tm_mon + 1);
 	req.time.day = cpu_to_be32(tm->tm_mday);
 	req.time.hour = cpu_to_be32(tm->tm_hour);
 	req.time.minute = cpu_to_be32(tm->tm_min);
 	req.time.second = cpu_to_be32(tm->tm_sec);
 	req.time.day_of_week = cpu_to_be32(tm->tm_wday);


 	rc = msm_rpc_call_reply(ep, TIMEREMOTE_PROCEEDURE_SET_JULIAN,
 				&req, sizeof(req),
 				&rep, sizeof(rep),
 				5 * HZ);
 	return rc;
 }

 static int
 msmrtc_timeremote_read_time(struct device *dev, struct rtc_time *tm)
 {
 	int rc;

 	struct timeremote_get_julian_req {
 		struct rpc_request_hdr hdr;
 		uint32_t julian_time_not_null;
 	} req;

 	struct timeremote_get_julian_rep {
 		struct rpc_reply_hdr hdr;
 		uint32_t opt_arg;
 		struct rpc_time_julian time;
 	} rep;

 	req.julian_time_not_null = cpu_to_be32(1);

 	rc = msm_rpc_call_reply(ep, TIMEREMOTE_PROCEEDURE_GET_JULIAN,
 				&req, sizeof(req),
 				&rep, sizeof(rep),
 				5 * HZ);
 	if (rc < 0)
 		return rc;

 	if (!be32_to_cpu(rep.opt_arg)) {
 		printk(KERN_ERR "%s: No data from RTC\n", __func__);
 		return -ENODATA;
 	}

 	tm->tm_year = be32_to_cpu(rep.time.year);
 	tm->tm_mon = be32_to_cpu(rep.time.month);
 	tm->tm_mday = be32_to_cpu(rep.time.day);
 	tm->tm_hour = be32_to_cpu(rep.time.hour);
 	tm->tm_min = be32_to_cpu(rep.time.minute);
 	tm->tm_sec = be32_to_cpu(rep.time.second);
 	tm->tm_wday = be32_to_cpu(rep.time.day_of_week);

 #if RTC_DEBUG
 	printk(KERN_DEBUG "%s: %.2u/%.2u/%.4u %.2u:%.2u:%.2u (%.2u)\n",
 	       __func__, tm->tm_mon, tm->tm_mday, tm->tm_year,
 	       tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
 #endif

 	tm->tm_year -= 1900;	/* RTC layer expects years to start at 1900 */
 	tm->tm_mon--;		/* RTC layer expects mons to be 0 based */

 	if (rtc_valid_tm(tm) < 0) {
 		dev_err(dev, "retrieved date/time is not valid.\n");
 		rtc_time_to_tm(0, tm);
 	}

 	return 0;
 }


 static int
 msmrtc_virtual_alarm_set(struct device *dev, struct rtc_wkalrm *a)
 {
 	unsigned long now = get_seconds();

 	if (!a->enabled) {
 		rtcalarm_time = 0;
 		return 0;
 	} else
 		rtc_tm_to_time(&a->time, &rtcalarm_time);

 	if (now > rtcalarm_time) {
 		printk(KERN_ERR "%s: Attempt to set alarm in the past\n",
 		       __func__);
 		rtcalarm_time = 0;
 		return -EINVAL;
 	}

 	return 0;
 }

 static struct rtc_class_ops msm_rtc_ops = {
 	.read_time	= msmrtc_timeremote_read_time,
 	.set_time	= msmrtc_timeremote_set_time,
 	.set_alarm	= msmrtc_virtual_alarm_set,
 };

 static void
 msmrtc_alarmtimer_expired(unsigned long _data)
 {
 #if RTC_DEBUG
 	printk(KERN_DEBUG "%s: Generating alarm event (src %lu)\n",
 	       rtc->name, _data);
 #endif
 	rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
 	rtcalarm_time = 0;
 }

 static int
 msmrtc_probe(struct platform_device *pdev)
 {
 	struct rpcsvr_platform_device *rdev =
 		container_of(pdev, struct rpcsvr_platform_device, base);

 	ep = msm_rpc_connect(rdev->prog, rdev->vers, 0);
 	if (IS_ERR(ep)) {
 		printk(KERN_ERR "%s: init rpc failed! rc = %ld\n",
 		       __func__, PTR_ERR(ep));
 		return PTR_ERR(ep);
 	}

 	rtc = rtc_device_register("msm_rtc",
 				  &pdev->dev,
 				  &msm_rtc_ops,
 				  THIS_MODULE);
 	if (IS_ERR(rtc)) {
 		printk(KERN_ERR "%s: Can't register RTC device (%ld)\n",
 		       pdev->name, PTR_ERR(rtc));
 		return PTR_ERR(rtc);
 	}
 	return 0;
 }


 static unsigned long msmrtc_get_seconds(void)
 {
 	struct rtc_time tm;
 	unsigned long now;

 	msmrtc_timeremote_read_time(NULL, &tm);
 	rtc_tm_to_time(&tm, &now);
 	return now;
 }

 static int
 msmrtc_suspend(struct platform_device *dev, pm_message_t state)
 {
 	if (rtcalarm_time) {
 		unsigned long now = msmrtc_get_seconds();
 		int diff = rtcalarm_time - now;
 		if (diff <= 0) {
 			msmrtc_alarmtimer_expired(1);
 			msm_pm_set_max_sleep_time(0);
 			return 0;
 		}
 		msm_pm_set_max_sleep_time((int64_t) ((int64_t) diff * NSEC_PER_SEC));
 	} else
 		msm_pm_set_max_sleep_time(0);
 	return 0;
 }

 static int
 msmrtc_resume(struct platform_device *dev)
 {
 	if (rtcalarm_time) {
 		unsigned long now = msmrtc_get_seconds();
 		int diff = rtcalarm_time - now;
 		if (diff <= 0)
 			msmrtc_alarmtimer_expired(2);
 	}
 	return 0;
 }

 static struct platform_driver msmrtc_driver = {
 	.probe		= msmrtc_probe,
 	.suspend	= msmrtc_suspend,
 	.resume		= msmrtc_resume,
 	.driver	= {
 		.name	= APP_TIMEREMOTE_PDEV_NAME,
 		.owner	= THIS_MODULE,
 	},
 };

 static int __init msmrtc_init(void)
 {
 	rtcalarm_time = 0;
 	return platform_driver_register(&msmrtc_driver);
 }

 module_init(msmrtc_init);

 MODULE_DESCRIPTION("RTC driver for Qualcomm MSM7x00a chipsets");
 MODULE_AUTHOR("San Mehat <san@android.com>");
 MODULE_LICENSE("GPL");
	/* drivers/rtc/rtc-msm7x00a.c
	*
	* Copyright (C) 2008 Google, Inc.
	* Author: San Mehat <san@google.com>
	*
	* This software is licensed under the terms of the GNU General Public
	* License version 2, as published by the Free Software Foundation, and
	* may be copied, distributed, and modified under those terms.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	*/

	#include <linux/module.h>
	#include <linux/version.h>

	#include <linux/kernel.h>
	#include <linux/platform_device.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <linux/rtc.h>
	#include <linux/msm_rpcrouter.h>

	#include <mach/msm_rpcrouter.h>

	#define RTC_DEBUG 0

	extern void msm_pm_set_max_sleep_time(int64_t sleep_time_ns);

	#if CONFIG_MSM_AMSS_VERSION >= 6350 \|\| defined(CONFIG_ARCH_QSD8X50)
	#define APP_TIMEREMOTE_PDEV_NAME "rs30000048:00010000"
	#else
	#define APP_TIMEREMOTE_PDEV_NAME "rs30000048:0da5b528"
	#endif

	#define TIMEREMOTE_PROCEEDURE_SET_JULIAN 6
	#define TIMEREMOTE_PROCEEDURE_GET_JULIAN 7

	struct rpc_time_julian {
	uint32_t year;
	uint32_t month;
	uint32_t day;
	uint32_t hour;
	uint32_t minute;
	uint32_t second;
	uint32_t day_of_week;
	};

	static struct msm_rpc_endpoint *ep;
	static struct rtc_device *rtc;
	static unsigned long rtcalarm_time;

	static int
	msmrtc_timeremote_set_time(struct device dev, struct rtc_time tm)
	{
	int rc;

	struct timeremote_set_julian_req {
	struct rpc_request_hdr hdr;
	uint32_t opt_arg;

	struct rpc_time_julian time;
	} req;

	struct timeremote_set_julian_rep {
	struct rpc_reply_hdr hdr;
	} rep;

	if (tm->tm_year < 1900)
	tm->tm_year += 1900;

	if (tm->tm_year < 1970)
	return -EINVAL;

	#if RTC_DEBUG
	printk(KERN_DEBUG "%s: %.2u/%.2u/%.4u %.2u:%.2u:%.2u (%.2u)\n",
	__func__, tm->tm_mon, tm->tm_mday, tm->tm_year,
	tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
	#endif

	req.opt_arg = cpu_to_be32(1);
	req.time.year = cpu_to_be32(tm->tm_year);
	req.time.month = cpu_to_be32(tm->tm_mon + 1);
	req.time.day = cpu_to_be32(tm->tm_mday);
	req.time.hour = cpu_to_be32(tm->tm_hour);
	req.time.minute = cpu_to_be32(tm->tm_min);
	req.time.second = cpu_to_be32(tm->tm_sec);
	req.time.day_of_week = cpu_to_be32(tm->tm_wday);


	rc = msm_rpc_call_reply(ep, TIMEREMOTE_PROCEEDURE_SET_JULIAN,
	&req, sizeof(req),
	&rep, sizeof(rep),
	5 * HZ);
	return rc;
	}

	static int
	msmrtc_timeremote_read_time(struct device dev, struct rtc_time tm)
	{
	int rc;

	struct timeremote_get_julian_req {
	struct rpc_request_hdr hdr;
	uint32_t julian_time_not_null;
	} req;

	struct timeremote_get_julian_rep {
	struct rpc_reply_hdr hdr;
	uint32_t opt_arg;
	struct rpc_time_julian time;
	} rep;

	req.julian_time_not_null = cpu_to_be32(1);

	rc = msm_rpc_call_reply(ep, TIMEREMOTE_PROCEEDURE_GET_JULIAN,
	&req, sizeof(req),
	&rep, sizeof(rep),
	5 * HZ);
	if (rc < 0)
	return rc;

	if (!be32_to_cpu(rep.opt_arg)) {
	printk(KERN_ERR "%s: No data from RTC\n", __func__);
	return -ENODATA;
	}

	tm->tm_year = be32_to_cpu(rep.time.year);
	tm->tm_mon = be32_to_cpu(rep.time.month);
	tm->tm_mday = be32_to_cpu(rep.time.day);
	tm->tm_hour = be32_to_cpu(rep.time.hour);
	tm->tm_min = be32_to_cpu(rep.time.minute);
	tm->tm_sec = be32_to_cpu(rep.time.second);
	tm->tm_wday = be32_to_cpu(rep.time.day_of_week);

	#if RTC_DEBUG
	printk(KERN_DEBUG "%s: %.2u/%.2u/%.4u %.2u:%.2u:%.2u (%.2u)\n",
	__func__, tm->tm_mon, tm->tm_mday, tm->tm_year,
	tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
	#endif

	tm->tm_year -= 1900; /* RTC layer expects years to start at 1900 */
	tm->tm_mon--; /* RTC layer expects mons to be 0 based */

	if (rtc_valid_tm(tm) < 0) {
	dev_err(dev, "retrieved date/time is not valid.\n");
	rtc_time_to_tm(0, tm);
	}

	return 0;
	}


	static int
	msmrtc_virtual_alarm_set(struct device dev, struct rtc_wkalrm a)
	{
	unsigned long now = get_seconds();

	if (!a->enabled) {
	rtcalarm_time = 0;
	return 0;
	} else
	rtc_tm_to_time(&a->time, &rtcalarm_time);

	if (now > rtcalarm_time) {
	printk(KERN_ERR "%s: Attempt to set alarm in the past\n",
	__func__);
	rtcalarm_time = 0;
	return -EINVAL;
	}

	return 0;
	}

	static struct rtc_class_ops msm_rtc_ops = {
	.read_time = msmrtc_timeremote_read_time,
	.set_time = msmrtc_timeremote_set_time,
	.set_alarm = msmrtc_virtual_alarm_set,
	};

	static void
	msmrtc_alarmtimer_expired(unsigned long _data)
	{
	#if RTC_DEBUG
	printk(KERN_DEBUG "%s: Generating alarm event (src %lu)\n",
	rtc->name, _data);
	#endif
	rtc_update_irq(rtc, 1, RTC_IRQF \| RTC_AF);
	rtcalarm_time = 0;
	}

	static int
	msmrtc_probe(struct platform_device *pdev)
	{
	struct rpcsvr_platform_device *rdev =
	container_of(pdev, struct rpcsvr_platform_device, base);

	ep = msm_rpc_connect(rdev->prog, rdev->vers, 0);
	if (IS_ERR(ep)) {
	printk(KERN_ERR "%s: init rpc failed! rc = %ld\n",
	__func__, PTR_ERR(ep));
	return PTR_ERR(ep);
	}

	rtc = rtc_device_register("msm_rtc",
	&pdev->dev,
	&msm_rtc_ops,
	THIS_MODULE);
	if (IS_ERR(rtc)) {
	printk(KERN_ERR "%s: Can't register RTC device (%ld)\n",
	pdev->name, PTR_ERR(rtc));
	return PTR_ERR(rtc);
	}
	return 0;
	}


	static unsigned long msmrtc_get_seconds(void)
	{
	struct rtc_time tm;
	unsigned long now;

	msmrtc_timeremote_read_time(NULL, &tm);
	rtc_tm_to_time(&tm, &now);
	return now;
	}

	static int
	msmrtc_suspend(struct platform_device *dev, pm_message_t state)
	{
	if (rtcalarm_time) {
	unsigned long now = msmrtc_get_seconds();
	int diff = rtcalarm_time - now;
	if (diff <= 0) {
	msmrtc_alarmtimer_expired(1);
	msm_pm_set_max_sleep_time(0);
	return 0;
	}
	msm_pm_set_max_sleep_time((int64_t) ((int64_t) diff * NSEC_PER_SEC));
	} else
	msm_pm_set_max_sleep_time(0);
	return 0;
	}

	static int
	msmrtc_resume(struct platform_device *dev)
	{
	if (rtcalarm_time) {
	unsigned long now = msmrtc_get_seconds();
	int diff = rtcalarm_time - now;
	if (diff <= 0)
	msmrtc_alarmtimer_expired(2);
	}
	return 0;
	}

	static struct platform_driver msmrtc_driver = {
	.probe = msmrtc_probe,
	.suspend = msmrtc_suspend,
	.resume = msmrtc_resume,
	.driver = {
	.name = APP_TIMEREMOTE_PDEV_NAME,
	.owner = THIS_MODULE,
	},
	};

	static int __init msmrtc_init(void)
	{
	rtcalarm_time = 0;
	return platform_driver_register(&msmrtc_driver);
	}

	module_init(msmrtc_init);

	MODULE_DESCRIPTION("RTC driver for Qualcomm MSM7x00a chipsets");
	MODULE_AUTHOR("San Mehat <san@android.com>");
	MODULE_LICENSE("GPL");