/* drivers/rtc/rtc-msm7x00a.c * * Copyright (C) 2008 Google, Inc. * Author: San Mehat * * 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 #include #include #include #include #include #include #include #include #include #define RTC_DEBUG 0 extern void msm_pm_set_max_sleep_time(int64_t sleep_time_ns); #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 "); MODULE_LICENSE("GPL");