rtc-ds1305.c revision fe20ba70abf7d6e5855c3dacc729490b3d0d077f
153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * rtc-ds1305.c -- driver for DS1305 and DS1306 SPI RTC chips 353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Copyright (C) 2008 David Brownell 553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * This program is free software; you can redistribute it and/or modify 753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * it under the terms of the GNU General Public License version 2 as 853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * published by the Free Software Foundation. 953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 1053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 1153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#include <linux/kernel.h> 1253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#include <linux/init.h> 1353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#include <linux/bcd.h> 1453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#include <linux/rtc.h> 1553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#include <linux/workqueue.h> 1653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 1753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#include <linux/spi/spi.h> 1853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#include <linux/spi/ds1305.h> 1953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 2053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 2153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 2253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Registers ... mask DS1305_WRITE into register address to write, 2353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * otherwise you're reading it. All non-bitmask values are BCD. 2453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 2553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_WRITE 0x80 2653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 2753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 2853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* RTC date/time ... the main special cases are that we: 2953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * - Need fancy "hours" encoding in 12hour mode 3053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * - Don't rely on the "day-of-week" field (or tm_wday) 3153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * - Are a 21st-century clock (2000 <= year < 2100) 3253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 3353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_RTC_LEN 7 /* bytes for RTC regs */ 3453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 3553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_SEC 0x00 /* register addresses */ 3653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_MIN 0x01 3753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_HOUR 0x02 3853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell# define DS1305_HR_12 0x40 /* set == 12 hr mode */ 3953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell# define DS1305_HR_PM 0x20 /* set == PM (12hr mode) */ 4053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_WDAY 0x03 4153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_MDAY 0x04 4253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_MON 0x05 4353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_YEAR 0x06 4453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 4553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 4653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* The two alarms have only sec/min/hour/wday fields (ALM_LEN). 4753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * DS1305_ALM_DISABLE disables a match field (some combos are bad). 4853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 4953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * NOTE that since we don't use WDAY, we limit ourselves to alarms 5053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * only one day into the future (vs potentially up to a week). 5153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 5253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * NOTE ALSO that while we could generate once-a-second IRQs (UIE), we 5353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * don't currently support them. We'd either need to do it only when 5453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * no alarm is pending (not the standard model), or to use the second 5553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * alarm (implying that this is a DS1305 not DS1306, *and* that either 5653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * it's wired up a second IRQ we know, or that INTCN is set) 5753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 5853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_ALM_LEN 4 /* bytes for ALM regs */ 5953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_ALM_DISABLE 0x80 6053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 6153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_ALM0(r) (0x07 + (r)) /* register addresses */ 6253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_ALM1(r) (0x0b + (r)) 6353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 6453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 6553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* three control registers */ 6653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_CONTROL_LEN 3 /* bytes of control regs */ 6753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 6853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_CONTROL 0x0f /* register addresses */ 6953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell# define DS1305_nEOSC 0x80 /* low enables oscillator */ 7053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell# define DS1305_WP 0x40 /* write protect */ 7153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell# define DS1305_INTCN 0x04 /* clear == only int0 used */ 7253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell# define DS1306_1HZ 0x04 /* enable 1Hz output */ 7353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell# define DS1305_AEI1 0x02 /* enable ALM1 IRQ */ 7453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell# define DS1305_AEI0 0x01 /* enable ALM0 IRQ */ 7553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_STATUS 0x10 7653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* status has just AEIx bits, mirrored as IRQFx */ 7753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_TRICKLE 0x11 7853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* trickle bits are defined in <linux/spi/ds1305.h> */ 7953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 8053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* a bunch of NVRAM */ 8153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_NVRAM_LEN 96 /* bytes of NVRAM */ 8253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 8353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_NVRAM 0x20 /* register addresses */ 8453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 8553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 8653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstruct ds1305 { 8753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_device *spi; 8853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct rtc_device *rtc; 8953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 9053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct work_struct work; 9153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 9253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell unsigned long flags; 9353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define FLAG_EXITING 0 9453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 9553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell bool hr12; 9653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 ctrl[DS1305_CONTROL_LEN]; 9753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell}; 9853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 9953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 10053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/*----------------------------------------------------------------------*/ 10153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 10253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 10353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Utilities ... tolerate 12-hour AM/PM notation in case of non-Linux 10453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * software (like a bootloader) which may require it. 10553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 10653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 10753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic unsigned bcd2hour(u8 bcd) 10853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 10953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (bcd & DS1305_HR_12) { 11053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell unsigned hour = 0; 11153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 11253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell bcd &= ~DS1305_HR_12; 11353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (bcd & DS1305_HR_PM) { 11453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell hour = 12; 11553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell bcd &= ~DS1305_HR_PM; 11653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 117fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk hour += bcd2bin(bcd); 11853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return hour - 1; 11953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 120fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk return bcd2bin(bcd); 12153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 12253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 12353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic u8 hour2bcd(bool hr12, int hour) 12453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 12553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (hr12) { 12653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell hour++; 12753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (hour <= 12) 128fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk return DS1305_HR_12 | bin2bcd(hour); 12953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell hour -= 12; 130fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk return DS1305_HR_12 | DS1305_HR_PM | bin2bcd(hour); 13153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 132fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk return bin2bcd(hour); 13353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 13453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 13553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/*----------------------------------------------------------------------*/ 13653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 13753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 13853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Interface to RTC framework 13953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 14053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 14153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#ifdef CONFIG_RTC_INTF_DEV 14253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 14353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 14453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Context: caller holds rtc->ops_lock (to protect ds1305->ctrl) 14553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 14653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int ds1305_ioctl(struct device *dev, unsigned cmd, unsigned long arg) 14753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 14853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = dev_get_drvdata(dev); 14953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 buf[2]; 15053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell int status = -ENOIOCTLCMD; 15153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 15253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[0] = DS1305_WRITE | DS1305_CONTROL; 15353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1] = ds1305->ctrl[0]; 15453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 15553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell switch (cmd) { 15653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell case RTC_AIE_OFF: 15753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = 0; 15853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (!(buf[1] & DS1305_AEI0)) 15953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto done; 16053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1] &= ~DS1305_AEI0; 16153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell break; 16253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 16353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell case RTC_AIE_ON: 16453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = 0; 16553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (ds1305->ctrl[0] & DS1305_AEI0) 16653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto done; 16753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1] |= DS1305_AEI0; 16853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell break; 16953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 17053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status == 0) { 17153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(ds1305->spi, buf, sizeof buf, 17253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell NULL, 0); 17353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status >= 0) 17453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[0] = buf[1]; 17553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 17653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 17753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownelldone: 17853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 17953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 18053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 18153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#else 18253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define ds1305_ioctl NULL 18353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#endif 18453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 18553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 18653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Get/set of date and time is pretty normal. 18753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 18853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 18953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int ds1305_get_time(struct device *dev, struct rtc_time *time) 19053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 19153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = dev_get_drvdata(dev); 19253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 addr = DS1305_SEC; 19353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 buf[DS1305_RTC_LEN]; 19453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell int status; 19553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 19653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Use write-then-read to get all the date/time registers 19753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * since dma from stack is nonportable 19853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 19953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(ds1305->spi, &addr, sizeof addr, 20053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf, sizeof buf); 20153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 20253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 20353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 20453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_vdbg(dev, "%s: %02x %02x %02x, %02x %02x %02x %02x\n", 20553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "read", buf[0], buf[1], buf[2], buf[3], 20653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[4], buf[5], buf[6]); 20753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 20853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Decode the registers */ 209fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk time->tm_sec = bcd2bin(buf[DS1305_SEC]); 210fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk time->tm_min = bcd2bin(buf[DS1305_MIN]); 21153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell time->tm_hour = bcd2hour(buf[DS1305_HOUR]); 21253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell time->tm_wday = buf[DS1305_WDAY] - 1; 213fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk time->tm_mday = bcd2bin(buf[DS1305_MDAY]); 214fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk time->tm_mon = bcd2bin(buf[DS1305_MON]) - 1; 215fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk time->tm_year = bcd2bin(buf[DS1305_YEAR]) + 100; 21653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 21753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_vdbg(dev, "%s secs=%d, mins=%d, " 21853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", 21953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "read", time->tm_sec, time->tm_min, 22053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell time->tm_hour, time->tm_mday, 22153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell time->tm_mon, time->tm_year, time->tm_wday); 22253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 22353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Time may not be set */ 22453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return rtc_valid_tm(time); 22553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 22653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 22753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int ds1305_set_time(struct device *dev, struct rtc_time *time) 22853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 22953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = dev_get_drvdata(dev); 23053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 buf[1 + DS1305_RTC_LEN]; 23153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 *bp = buf; 23253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 23353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_vdbg(dev, "%s secs=%d, mins=%d, " 23453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", 23553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "write", time->tm_sec, time->tm_min, 23653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell time->tm_hour, time->tm_mday, 23753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell time->tm_mon, time->tm_year, time->tm_wday); 23853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 23953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Write registers starting at the first time/date address. */ 24053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell *bp++ = DS1305_WRITE | DS1305_SEC; 24153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 242fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk *bp++ = bin2bcd(time->tm_sec); 243fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk *bp++ = bin2bcd(time->tm_min); 24453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell *bp++ = hour2bcd(ds1305->hr12, time->tm_hour); 24553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell *bp++ = (time->tm_wday < 7) ? (time->tm_wday + 1) : 1; 246fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk *bp++ = bin2bcd(time->tm_mday); 247fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk *bp++ = bin2bcd(time->tm_mon + 1); 248fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk *bp++ = bin2bcd(time->tm_year - 100); 24953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 25053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(dev, "%s: %02x %02x %02x, %02x %02x %02x %02x\n", 25153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "write", buf[1], buf[2], buf[3], 25253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[4], buf[5], buf[6], buf[7]); 25353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 25453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* use write-then-read since dma from stack is nonportable */ 25553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return spi_write_then_read(ds1305->spi, buf, sizeof buf, 25653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell NULL, 0); 25753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 25853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 25953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 26053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Get/set of alarm is a bit funky: 26153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 26253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * - First there's the inherent raciness of getting the (partitioned) 26353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * status of an alarm that could trigger while we're reading parts 26453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * of that status. 26553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 26653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * - Second there's its limited range (we could increase it a bit by 26753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * relying on WDAY), which means it will easily roll over. 26853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 26953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * - Third there's the choice of two alarms and alarm signals. 27053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Here we use ALM0 and expect that nINT0 (open drain) is used; 27153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * that's the only real option for DS1306 runtime alarms, and is 27253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * natural on DS1305. 27353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 27453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * - Fourth, there's also ALM1, and a second interrupt signal: 27553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * + On DS1305 ALM1 uses nINT1 (when INTCN=1) else nINT0; 27653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * + On DS1306 ALM1 only uses INT1 (an active high pulse) 27753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * and it won't work when VCC1 is active. 27853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 27953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * So to be most general, we should probably set both alarms to the 28053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * same value, letting ALM1 be the wakeup event source on DS1306 28153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * and handling several wiring options on DS1305. 28253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 28353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * - Fifth, we support the polled mode (as well as possible; why not?) 28453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * even when no interrupt line is wired to an IRQ. 28553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 28653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 28753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 28853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Context: caller holds rtc->ops_lock (to protect ds1305->ctrl) 28953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 29053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int ds1305_get_alarm(struct device *dev, struct rtc_wkalrm *alm) 29153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 29253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = dev_get_drvdata(dev); 29353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_device *spi = ds1305->spi; 29453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 addr; 29553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell int status; 29653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 buf[DS1305_ALM_LEN]; 29753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 29853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Refresh control register cache BEFORE reading ALM0 registers, 29953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * since reading alarm registers acks any pending IRQ. That 30053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * makes returning "pending" status a bit of a lie, but that bit 30153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * of EFI status is at best fragile anyway (given IRQ handlers). 30253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 30353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell addr = DS1305_CONTROL; 30453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(spi, &addr, sizeof addr, 30553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl, sizeof ds1305->ctrl); 30653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 30753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 30853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 30953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->enabled = !!(ds1305->ctrl[0] & DS1305_AEI0); 31053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->pending = !!(ds1305->ctrl[1] & DS1305_AEI0); 31153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 31253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* get and check ALM0 registers */ 31353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell addr = DS1305_ALM0(DS1305_SEC); 31453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(spi, &addr, sizeof addr, 31553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf, sizeof buf); 31653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 31753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 31853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 31953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_vdbg(dev, "%s: %02x %02x %02x %02x\n", 32053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "alm0 read", buf[DS1305_SEC], buf[DS1305_MIN], 32153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[DS1305_HOUR], buf[DS1305_WDAY]); 32253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 32353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if ((DS1305_ALM_DISABLE & buf[DS1305_SEC]) 32453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell || (DS1305_ALM_DISABLE & buf[DS1305_MIN]) 32553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell || (DS1305_ALM_DISABLE & buf[DS1305_HOUR])) 32653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return -EIO; 32753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 32853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Stuff these values into alm->time and let RTC framework code 32953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * fill in the rest ... and also handle rollover to tomorrow when 33053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * that's needed. 33153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 332fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk alm->time.tm_sec = bcd2bin(buf[DS1305_SEC]); 333fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk alm->time.tm_min = bcd2bin(buf[DS1305_MIN]); 33453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->time.tm_hour = bcd2hour(buf[DS1305_HOUR]); 33553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->time.tm_mday = -1; 33653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->time.tm_mon = -1; 33753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->time.tm_year = -1; 33853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* next three fields are unused by Linux */ 33953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->time.tm_wday = -1; 34053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->time.tm_mday = -1; 34153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->time.tm_isdst = -1; 34253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 34353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return 0; 34453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 34553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 34653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 34753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Context: caller holds rtc->ops_lock (to protect ds1305->ctrl) 34853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 34953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int ds1305_set_alarm(struct device *dev, struct rtc_wkalrm *alm) 35053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 35153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = dev_get_drvdata(dev); 35253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_device *spi = ds1305->spi; 35353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell unsigned long now, later; 35453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct rtc_time tm; 35553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell int status; 35653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 buf[1 + DS1305_ALM_LEN]; 35753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 35853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* convert desired alarm to time_t */ 35953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = rtc_tm_to_time(&alm->time, &later); 36053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 36153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 36253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 36353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Read current time as time_t */ 36453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = ds1305_get_time(dev, &tm); 36553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 36653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 36753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = rtc_tm_to_time(&tm, &now); 36853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 36953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 37053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 37153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* make sure alarm fires within the next 24 hours */ 37253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (later <= now) 37353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return -EINVAL; 37453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if ((later - now) > 24 * 60 * 60) 37553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return -EDOM; 37653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 37753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* disable alarm if needed */ 37853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (ds1305->ctrl[0] & DS1305_AEI0) { 37953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[0] &= ~DS1305_AEI0; 38053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 38153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[0] = DS1305_WRITE | DS1305_CONTROL; 38253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1] = ds1305->ctrl[0]; 38353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(ds1305->spi, buf, 2, NULL, 0); 38453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 38553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 38653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 38753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 38853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* write alarm */ 38953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[0] = DS1305_WRITE | DS1305_ALM0(DS1305_SEC); 390fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk buf[1 + DS1305_SEC] = bin2bcd(alm->time.tm_sec); 391fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk buf[1 + DS1305_MIN] = bin2bcd(alm->time.tm_min); 39253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1 + DS1305_HOUR] = hour2bcd(ds1305->hr12, alm->time.tm_hour); 39353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1 + DS1305_WDAY] = DS1305_ALM_DISABLE; 39453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 39553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(dev, "%s: %02x %02x %02x %02x\n", 39653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "alm0 write", buf[1 + DS1305_SEC], buf[1 + DS1305_MIN], 39753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1 + DS1305_HOUR], buf[1 + DS1305_WDAY]); 39853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 39953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(spi, buf, sizeof buf, NULL, 0); 40053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 40153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 40253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 40353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* enable alarm if requested */ 40453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (alm->enabled) { 40553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[0] |= DS1305_AEI0; 40653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 40753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[0] = DS1305_WRITE | DS1305_CONTROL; 40853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1] = ds1305->ctrl[0]; 40953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(ds1305->spi, buf, 2, NULL, 0); 41053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 41153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 41253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 41353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 41453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 41553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#ifdef CONFIG_PROC_FS 41653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 41753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int ds1305_proc(struct device *dev, struct seq_file *seq) 41853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 41953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = dev_get_drvdata(dev); 42053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell char *diodes = "no"; 42153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell char *resistors = ""; 42253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 42353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* ctrl[2] is treated as read-only; no locking needed */ 42453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if ((ds1305->ctrl[2] & 0xf0) == DS1305_TRICKLE_MAGIC) { 42553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell switch (ds1305->ctrl[2] & 0x0c) { 42653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell case DS1305_TRICKLE_DS2: 42753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell diodes = "2 diodes, "; 42853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell break; 42953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell case DS1305_TRICKLE_DS1: 43053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell diodes = "1 diode, "; 43153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell break; 43253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell default: 43353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto done; 43453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 43553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell switch (ds1305->ctrl[2] & 0x03) { 43653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell case DS1305_TRICKLE_2K: 43753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell resistors = "2k Ohm"; 43853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell break; 43953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell case DS1305_TRICKLE_4K: 44053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell resistors = "4k Ohm"; 44153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell break; 44253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell case DS1305_TRICKLE_8K: 44353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell resistors = "8k Ohm"; 44453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell break; 44553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell default: 44653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell diodes = "no"; 44753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell break; 44853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 44953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 45053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 45153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownelldone: 45253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return seq_printf(seq, 45353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "trickle_charge\t: %s%s\n", 45453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell diodes, resistors); 45553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 45653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 45753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#else 45853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define ds1305_proc NULL 45953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#endif 46053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 46153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic const struct rtc_class_ops ds1305_ops = { 46253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .ioctl = ds1305_ioctl, 46353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .read_time = ds1305_get_time, 46453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .set_time = ds1305_set_time, 46553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .read_alarm = ds1305_get_alarm, 46653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .set_alarm = ds1305_set_alarm, 46753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .proc = ds1305_proc, 46853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell}; 46953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 47053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic void ds1305_work(struct work_struct *work) 47153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 47253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = container_of(work, struct ds1305, work); 47353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct mutex *lock = &ds1305->rtc->ops_lock; 47453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_device *spi = ds1305->spi; 47553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 buf[3]; 47653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell int status; 47753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 47853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* lock to protect ds1305->ctrl */ 47953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell mutex_lock(lock); 48053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 48153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Disable the IRQ, and clear its status ... for now, we "know" 48253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * that if more than one alarm is active, they're in sync. 48353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Note that reading ALM data registers also clears IRQ status. 48453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 48553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[0] &= ~(DS1305_AEI1 | DS1305_AEI0); 48653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[1] = 0; 48753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 48853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[0] = DS1305_WRITE | DS1305_CONTROL; 48953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1] = ds1305->ctrl[0]; 49053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[2] = 0; 49153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 49253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(spi, buf, sizeof buf, 49353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell NULL, 0); 49453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 49553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "clear irq --> %d\n", status); 49653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 49753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell mutex_unlock(lock); 49853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 49953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (!test_bit(FLAG_EXITING, &ds1305->flags)) 50053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell enable_irq(spi->irq); 50153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 50253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* rtc_update_irq() requires an IRQ-disabled context */ 50353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell local_irq_disable(); 50453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell rtc_update_irq(ds1305->rtc, 1, RTC_AF | RTC_IRQF); 50553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell local_irq_enable(); 50653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 50753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 50853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 50953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * This "real" IRQ handler hands off to a workqueue mostly to allow 51053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * mutex locking for ds1305->ctrl ... unlike I2C, we could issue async 51153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * I/O requests in IRQ context (to clear the IRQ status). 51253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 51353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic irqreturn_t ds1305_irq(int irq, void *p) 51453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 51553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = p; 51653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 51753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell disable_irq(irq); 51853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell schedule_work(&ds1305->work); 51953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return IRQ_HANDLED; 52053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 52153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 52253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/*----------------------------------------------------------------------*/ 52353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 52453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 52553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Interface for NVRAM 52653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 52753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 52853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic void msg_init(struct spi_message *m, struct spi_transfer *x, 52953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 *addr, size_t count, char *tx, char *rx) 53053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 53153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi_message_init(m); 53253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell memset(x, 0, 2 * sizeof(*x)); 53353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 53453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell x->tx_buf = addr; 53553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell x->len = 1; 53653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi_message_add_tail(x, m); 53753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 53853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell x++; 53953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 54053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell x->tx_buf = tx; 54153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell x->rx_buf = rx; 54253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell x->len = count; 54353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi_message_add_tail(x, m); 54453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 54553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 54653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic ssize_t 54753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellds1305_nvram_read(struct kobject *kobj, struct bin_attribute *attr, 54853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell char *buf, loff_t off, size_t count) 54953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 55053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_device *spi; 55153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 addr; 55253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_message m; 55353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_transfer x[2]; 55453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell int status; 55553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 55653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi = container_of(kobj, struct spi_device, dev.kobj); 55753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 55853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (unlikely(off >= DS1305_NVRAM_LEN)) 55953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return 0; 56053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (count >= DS1305_NVRAM_LEN) 56153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell count = DS1305_NVRAM_LEN; 56253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if ((off + count) > DS1305_NVRAM_LEN) 56353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell count = DS1305_NVRAM_LEN - off; 56453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (unlikely(!count)) 56553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return count; 56653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 56753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell addr = DS1305_NVRAM + off; 56853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell msg_init(&m, x, &addr, count, NULL, buf); 56953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 57053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_sync(spi, &m); 57153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 57253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_err(&spi->dev, "nvram %s error %d\n", "read", status); 57353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return (status < 0) ? status : count; 57453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 57553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 57653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic ssize_t 57753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellds1305_nvram_write(struct kobject *kobj, struct bin_attribute *attr, 57853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell char *buf, loff_t off, size_t count) 57953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 58053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_device *spi; 58153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 addr; 58253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_message m; 58353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_transfer x[2]; 58453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell int status; 58553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 58653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi = container_of(kobj, struct spi_device, dev.kobj); 58753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 58853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (unlikely(off >= DS1305_NVRAM_LEN)) 58953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return -EFBIG; 59053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (count >= DS1305_NVRAM_LEN) 59153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell count = DS1305_NVRAM_LEN; 59253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if ((off + count) > DS1305_NVRAM_LEN) 59353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell count = DS1305_NVRAM_LEN - off; 59453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (unlikely(!count)) 59553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return count; 59653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 59753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell addr = (DS1305_WRITE | DS1305_NVRAM) + off; 59853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell msg_init(&m, x, &addr, count, buf, NULL); 59953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 60053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_sync(spi, &m); 60153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 60253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_err(&spi->dev, "nvram %s error %d\n", "write", status); 60353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return (status < 0) ? status : count; 60453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 60553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 60653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic struct bin_attribute nvram = { 60753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .attr.name = "nvram", 60853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .attr.mode = S_IRUGO | S_IWUSR, 60953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .attr.owner = THIS_MODULE, 61053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .read = ds1305_nvram_read, 61153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .write = ds1305_nvram_write, 61253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .size = DS1305_NVRAM_LEN, 61353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell}; 61453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 61553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/*----------------------------------------------------------------------*/ 61653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 61753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 61853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Interface to SPI stack 61953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 62053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 62153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int __devinit ds1305_probe(struct spi_device *spi) 62253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 62353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305; 62453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct rtc_device *rtc; 62553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell int status; 62653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 addr, value; 62753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305_platform_data *pdata = spi->dev.platform_data; 62853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell bool write_ctrl = false; 62953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 63053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Sanity check board setup data. This may be hooked up 63153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * in 3wire mode, but we don't care. Note that unless 63253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * there's an inverter in place, this needs SPI_CS_HIGH! 63353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 63453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if ((spi->bits_per_word && spi->bits_per_word != 8) 63553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell || (spi->max_speed_hz > 2000000) 63653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell || !(spi->mode & SPI_CPHA)) 63753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return -EINVAL; 63853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 63953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* set up driver data */ 64053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305 = kzalloc(sizeof *ds1305, GFP_KERNEL); 64153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (!ds1305) 64253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return -ENOMEM; 64353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->spi = spi; 64453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi_set_drvdata(spi, ds1305); 64553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 64653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* read and cache control registers */ 64753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell addr = DS1305_CONTROL; 64853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(spi, &addr, sizeof addr, 64953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl, sizeof ds1305->ctrl); 65053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) { 65153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "can't %s, %d\n", 65253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "read", status); 65353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto fail0; 65453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 65553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 65653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "ctrl %s: %02x %02x %02x\n", 65753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "read", ds1305->ctrl[0], 65853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[1], ds1305->ctrl[2]); 65953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 66053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Sanity check register values ... partially compensating for the 66153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * fact that SPI has no device handshake. A pullup on MISO would 66253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * make these tests fail; but not all systems will have one. If 66353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * some register is neither 0x00 nor 0xff, a chip is likely there. 66453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 66553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if ((ds1305->ctrl[0] & 0x38) != 0 || (ds1305->ctrl[1] & 0xfc) != 0) { 66653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "RTC chip is not present\n"); 66753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = -ENODEV; 66853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto fail0; 66953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 67053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (ds1305->ctrl[2] == 0) 67153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "chip may not be present\n"); 67253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 67353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* enable writes if needed ... if we were paranoid it would 67453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * make sense to enable them only when absolutely necessary. 67553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 67653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (ds1305->ctrl[0] & DS1305_WP) { 67753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 buf[2]; 67853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 67953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[0] &= ~DS1305_WP; 68053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 68153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[0] = DS1305_WRITE | DS1305_CONTROL; 68253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1] = ds1305->ctrl[0]; 68353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(spi, buf, sizeof buf, NULL, 0); 68453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 68553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "clear WP --> %d\n", status); 68653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 68753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto fail0; 68853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 68953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 69053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* on DS1305, maybe start oscillator; like most low power 69153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * oscillators, it may take a second to stabilize 69253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 69353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (ds1305->ctrl[0] & DS1305_nEOSC) { 69453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[0] &= ~DS1305_nEOSC; 69553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell write_ctrl = true; 69653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_warn(&spi->dev, "SET TIME!\n"); 69753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 69853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 69953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* ack any pending IRQs */ 70053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (ds1305->ctrl[1]) { 70153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[1] = 0; 70253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell write_ctrl = true; 70353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 70453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 70553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* this may need one-time (re)init */ 70653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (pdata) { 70753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* maybe enable trickle charge */ 70853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (((ds1305->ctrl[2] & 0xf0) != DS1305_TRICKLE_MAGIC)) { 70953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[2] = DS1305_TRICKLE_MAGIC 71053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell | pdata->trickle; 71153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell write_ctrl = true; 71253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 71353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 71453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* on DS1306, configure 1 Hz signal */ 71553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (pdata->is_ds1306) { 71653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (pdata->en_1hz) { 71753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (!(ds1305->ctrl[0] & DS1306_1HZ)) { 71853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[0] |= DS1306_1HZ; 71953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell write_ctrl = true; 72053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 72153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } else { 72253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (ds1305->ctrl[0] & DS1306_1HZ) { 72353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[0] &= ~DS1306_1HZ; 72453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell write_ctrl = true; 72553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 72653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 72753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 72853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 72953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 73053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (write_ctrl) { 73153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 buf[4]; 73253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 73353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[0] = DS1305_WRITE | DS1305_CONTROL; 73453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1] = ds1305->ctrl[0]; 73553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[2] = ds1305->ctrl[1]; 73653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[3] = ds1305->ctrl[2]; 73753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(spi, buf, sizeof buf, NULL, 0); 73853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) { 73953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "can't %s, %d\n", 74053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "write", status); 74153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto fail0; 74253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 74353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 74453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "ctrl %s: %02x %02x %02x\n", 74553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "write", ds1305->ctrl[0], 74653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[1], ds1305->ctrl[2]); 74753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 74853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 74953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* see if non-Linux software set up AM/PM mode */ 75053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell addr = DS1305_HOUR; 75153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(spi, &addr, sizeof addr, 75253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell &value, sizeof value); 75353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) { 75453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "read HOUR --> %d\n", status); 75553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto fail0; 75653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 75753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 75853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->hr12 = (DS1305_HR_12 & value) != 0; 75953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (ds1305->hr12) 76053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "AM/PM\n"); 76153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 76253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* register RTC ... from here on, ds1305->ctrl needs locking */ 76353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell rtc = rtc_device_register("ds1305", &spi->dev, 76453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell &ds1305_ops, THIS_MODULE); 76553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (IS_ERR(rtc)) { 76653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = PTR_ERR(rtc); 76753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "register rtc --> %d\n", status); 76853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto fail0; 76953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 77053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->rtc = rtc; 77153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 77253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Maybe set up alarm IRQ; be ready to handle it triggering right 77353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * away. NOTE that we don't share this. The signal is active low, 77453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * and we can't ack it before a SPI message delay. We temporarily 77553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * disable the IRQ until it's acked, which lets us work with more 77653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * IRQ trigger modes (not all IRQ controllers can do falling edge). 77753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 77853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (spi->irq) { 77953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell INIT_WORK(&ds1305->work, ds1305_work); 78053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = request_irq(spi->irq, ds1305_irq, 78153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 0, dev_name(&rtc->dev), ds1305); 78253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) { 78353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "request_irq %d --> %d\n", 78453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi->irq, status); 78553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto fail1; 78653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 78753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 78853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 78953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* export NVRAM */ 79053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = sysfs_create_bin_file(&spi->dev.kobj, &nvram); 79153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) { 79253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "register nvram --> %d\n", status); 79353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto fail2; 79453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 79553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 79653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return 0; 79753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 79853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellfail2: 79953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell free_irq(spi->irq, ds1305); 80053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellfail1: 80153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell rtc_device_unregister(rtc); 80253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellfail0: 80353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell kfree(ds1305); 80453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 80553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 80653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 80753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int __devexit ds1305_remove(struct spi_device *spi) 80853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 80953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = spi_get_drvdata(spi); 81053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 81153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell sysfs_remove_bin_file(&spi->dev.kobj, &nvram); 81253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 81353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* carefully shut down irq and workqueue, if present */ 81453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (spi->irq) { 81553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell set_bit(FLAG_EXITING, &ds1305->flags); 81653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell free_irq(spi->irq, ds1305); 81753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell flush_scheduled_work(); 81853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 81953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 82053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell rtc_device_unregister(ds1305->rtc); 82153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi_set_drvdata(spi, NULL); 82253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell kfree(ds1305); 82353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return 0; 82453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 82553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 82653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic struct spi_driver ds1305_driver = { 82753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .driver.name = "rtc-ds1305", 82853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .driver.owner = THIS_MODULE, 82953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .probe = ds1305_probe, 83053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .remove = __devexit_p(ds1305_remove), 83153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* REVISIT add suspend/resume */ 83253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell}; 83353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 83453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int __init ds1305_init(void) 83553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 83653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return spi_register_driver(&ds1305_driver); 83753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 83853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellmodule_init(ds1305_init); 83953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 84053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic void __exit ds1305_exit(void) 84153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 84253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi_unregister_driver(&ds1305_driver); 84353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 84453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellmodule_exit(ds1305_exit); 84553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 84653e84b672c1a8190af2b376c35c7a39cf1214f59David BrownellMODULE_DESCRIPTION("RTC driver for DS1305 and DS1306 chips"); 84753e84b672c1a8190af2b376c35c7a39cf1214f59David BrownellMODULE_LICENSE("GPL"); 848