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drivers/rtc/rtc-tile.c
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dd196a2b3 tile: add an RTC ... |
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/* * Copyright 2011 Tilera Corporation. All Rights Reserved. * * 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, version 2. * * 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, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for * more details. * * Tilera-specific RTC driver. */ #include <linux/module.h> #include <linux/device.h> #include <linux/rtc.h> #include <linux/platform_device.h> /* Platform device pointer. */ static struct platform_device *tile_rtc_platform_device; /* * RTC read routine. Gets time info from RTC chip via hypervisor syscall. */ static int read_rtc_time(struct device *dev, struct rtc_time *tm) { HV_RTCTime hvtm = hv_get_rtc(); tm->tm_sec = hvtm.tm_sec; tm->tm_min = hvtm.tm_min; tm->tm_hour = hvtm.tm_hour; tm->tm_mday = hvtm.tm_mday; tm->tm_mon = hvtm.tm_mon; tm->tm_year = hvtm.tm_year; tm->tm_wday = 0; tm->tm_yday = 0; tm->tm_isdst = 0; if (rtc_valid_tm(tm) < 0) dev_warn(dev, "Read invalid date/time from RTC "); return 0; } /* * RTC write routine. Sends time info to hypervisor via syscall, to be * written to RTC chip. */ static int set_rtc_time(struct device *dev, struct rtc_time *tm) { HV_RTCTime hvtm; hvtm.tm_sec = tm->tm_sec; hvtm.tm_min = tm->tm_min; hvtm.tm_hour = tm->tm_hour; hvtm.tm_mday = tm->tm_mday; hvtm.tm_mon = tm->tm_mon; hvtm.tm_year = tm->tm_year; hv_set_rtc(hvtm); return 0; } /* * RTC read/write ops. */ static const struct rtc_class_ops tile_rtc_ops = { .read_time = read_rtc_time, .set_time = set_rtc_time, }; /* * Device probe routine. */ static int __devinit tile_rtc_probe(struct platform_device *dev) { struct rtc_device *rtc; rtc = rtc_device_register("tile", &dev->dev, &tile_rtc_ops, THIS_MODULE); if (IS_ERR(rtc)) return PTR_ERR(rtc); platform_set_drvdata(dev, rtc); return 0; } /* * Device cleanup routine. */ static int __devexit tile_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 tile_rtc_platform_driver = { .driver = { .name = "rtc-tile", .owner = THIS_MODULE, }, .probe = tile_rtc_probe, .remove = __devexit_p(tile_rtc_remove), }; /* * Driver init routine. */ static int __init tile_rtc_driver_init(void) { int err; err = platform_driver_register(&tile_rtc_platform_driver); if (err) return err; tile_rtc_platform_device = platform_device_alloc("rtc-tile", 0); if (tile_rtc_platform_device == NULL) { err = -ENOMEM; goto exit_driver_unregister; } err = platform_device_add(tile_rtc_platform_device); if (err) goto exit_device_put; return 0; exit_device_put: platform_device_put(tile_rtc_platform_device); exit_driver_unregister: platform_driver_unregister(&tile_rtc_platform_driver); return err; } /* * Driver cleanup routine. */ static void __exit tile_rtc_driver_exit(void) { platform_driver_unregister(&tile_rtc_platform_driver); } module_init(tile_rtc_driver_init); module_exit(tile_rtc_driver_exit); MODULE_DESCRIPTION("Tilera-specific Real Time Clock Driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:rtc-tile"); |