rtc-ds1305.c revision 5a0e3ad6af8660be21ca98a971cd00f331318c05
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> 145a0e3ad6af8660be21ca98a971cd00f331318c05Tejun Heo#include <linux/slab.h> 1553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#include <linux/rtc.h> 1653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#include <linux/workqueue.h> 1753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 1853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#include <linux/spi/spi.h> 1953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#include <linux/spi/ds1305.h> 2053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 2153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 2253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 2353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Registers ... mask DS1305_WRITE into register address to write, 2453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * otherwise you're reading it. All non-bitmask values are BCD. 2553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 2653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_WRITE 0x80 2753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 2853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 2953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* RTC date/time ... the main special cases are that we: 3053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * - Need fancy "hours" encoding in 12hour mode 3153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * - Don't rely on the "day-of-week" field (or tm_wday) 3253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * - Are a 21st-century clock (2000 <= year < 2100) 3353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 3453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_RTC_LEN 7 /* bytes for RTC regs */ 3553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 3653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_SEC 0x00 /* register addresses */ 3753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_MIN 0x01 3853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_HOUR 0x02 3953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell# define DS1305_HR_12 0x40 /* set == 12 hr mode */ 4053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell# define DS1305_HR_PM 0x20 /* set == PM (12hr mode) */ 4153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_WDAY 0x03 4253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_MDAY 0x04 4353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_MON 0x05 4453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_YEAR 0x06 4553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 4653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 4753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* The two alarms have only sec/min/hour/wday fields (ALM_LEN). 4853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * DS1305_ALM_DISABLE disables a match field (some combos are bad). 4953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 5053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * NOTE that since we don't use WDAY, we limit ourselves to alarms 5153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * only one day into the future (vs potentially up to a week). 5253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 5353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * NOTE ALSO that while we could generate once-a-second IRQs (UIE), we 5453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * don't currently support them. We'd either need to do it only when 5553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * no alarm is pending (not the standard model), or to use the second 5653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * alarm (implying that this is a DS1305 not DS1306, *and* that either 5753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * it's wired up a second IRQ we know, or that INTCN is set) 5853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 5953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_ALM_LEN 4 /* bytes for ALM regs */ 6053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_ALM_DISABLE 0x80 6153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 6253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_ALM0(r) (0x07 + (r)) /* register addresses */ 6353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_ALM1(r) (0x0b + (r)) 6453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 6553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 6653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* three control registers */ 6753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_CONTROL_LEN 3 /* bytes of control regs */ 6853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 6953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_CONTROL 0x0f /* register addresses */ 7053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell# define DS1305_nEOSC 0x80 /* low enables oscillator */ 7153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell# define DS1305_WP 0x40 /* write protect */ 7253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell# define DS1305_INTCN 0x04 /* clear == only int0 used */ 7353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell# define DS1306_1HZ 0x04 /* enable 1Hz output */ 7453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell# define DS1305_AEI1 0x02 /* enable ALM1 IRQ */ 7553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell# define DS1305_AEI0 0x01 /* enable ALM0 IRQ */ 7653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_STATUS 0x10 7753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* status has just AEIx bits, mirrored as IRQFx */ 7853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_TRICKLE 0x11 7953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* trickle bits are defined in <linux/spi/ds1305.h> */ 8053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 8153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* a bunch of NVRAM */ 8253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_NVRAM_LEN 96 /* bytes of NVRAM */ 8353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 8453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define DS1305_NVRAM 0x20 /* register addresses */ 8553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 8653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 8753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstruct ds1305 { 8853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_device *spi; 8953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct rtc_device *rtc; 9053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 9153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct work_struct work; 9253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 9353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell unsigned long flags; 9453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define FLAG_EXITING 0 9553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 9653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell bool hr12; 9753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 ctrl[DS1305_CONTROL_LEN]; 9853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell}; 9953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 10053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 10153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/*----------------------------------------------------------------------*/ 10253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 10353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 10453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Utilities ... tolerate 12-hour AM/PM notation in case of non-Linux 10553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * software (like a bootloader) which may require it. 10653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 10753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 10853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic unsigned bcd2hour(u8 bcd) 10953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 11053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (bcd & DS1305_HR_12) { 11153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell unsigned hour = 0; 11253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 11353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell bcd &= ~DS1305_HR_12; 11453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (bcd & DS1305_HR_PM) { 11553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell hour = 12; 11653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell bcd &= ~DS1305_HR_PM; 11753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 118fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk hour += bcd2bin(bcd); 11953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return hour - 1; 12053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 121fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk return bcd2bin(bcd); 12253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 12353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 12453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic u8 hour2bcd(bool hr12, int hour) 12553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 12653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (hr12) { 12753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell hour++; 12853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (hour <= 12) 129fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk return DS1305_HR_12 | bin2bcd(hour); 13053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell hour -= 12; 131fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk return DS1305_HR_12 | DS1305_HR_PM | bin2bcd(hour); 13253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 133fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk return bin2bcd(hour); 13453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 13553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 13653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/*----------------------------------------------------------------------*/ 13753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 13853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 13953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Interface to RTC framework 14053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 14153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 14253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#ifdef CONFIG_RTC_INTF_DEV 14353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 14453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 14553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Context: caller holds rtc->ops_lock (to protect ds1305->ctrl) 14653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 14753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int ds1305_ioctl(struct device *dev, unsigned cmd, unsigned long arg) 14853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 14953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = dev_get_drvdata(dev); 15053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 buf[2]; 15153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell int status = -ENOIOCTLCMD; 15253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 15353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[0] = DS1305_WRITE | DS1305_CONTROL; 15453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1] = ds1305->ctrl[0]; 15553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 15653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell switch (cmd) { 15753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell case RTC_AIE_OFF: 15853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = 0; 15953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (!(buf[1] & DS1305_AEI0)) 16053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto done; 16153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1] &= ~DS1305_AEI0; 16253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell break; 16353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 16453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell case RTC_AIE_ON: 16553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = 0; 16653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (ds1305->ctrl[0] & DS1305_AEI0) 16753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto done; 16853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1] |= DS1305_AEI0; 16953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell break; 17053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 17153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status == 0) { 17253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(ds1305->spi, buf, sizeof buf, 17353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell NULL, 0); 17453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status >= 0) 17553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[0] = buf[1]; 17653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 17753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 17853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownelldone: 17953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 18053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 18153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 18253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#else 18353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define ds1305_ioctl NULL 18453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#endif 18553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 18653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 18753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Get/set of date and time is pretty normal. 18853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 18953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 19053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int ds1305_get_time(struct device *dev, struct rtc_time *time) 19153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 19253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = dev_get_drvdata(dev); 19353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 addr = DS1305_SEC; 19453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 buf[DS1305_RTC_LEN]; 19553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell int status; 19653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 19753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Use write-then-read to get all the date/time registers 19853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * since dma from stack is nonportable 19953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 20053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(ds1305->spi, &addr, sizeof addr, 20153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf, sizeof buf); 20253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 20353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 20453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 20553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_vdbg(dev, "%s: %02x %02x %02x, %02x %02x %02x %02x\n", 20653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "read", buf[0], buf[1], buf[2], buf[3], 20753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[4], buf[5], buf[6]); 20853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 20953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Decode the registers */ 210fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk time->tm_sec = bcd2bin(buf[DS1305_SEC]); 211fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk time->tm_min = bcd2bin(buf[DS1305_MIN]); 21253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell time->tm_hour = bcd2hour(buf[DS1305_HOUR]); 21353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell time->tm_wday = buf[DS1305_WDAY] - 1; 214fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk time->tm_mday = bcd2bin(buf[DS1305_MDAY]); 215fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk time->tm_mon = bcd2bin(buf[DS1305_MON]) - 1; 216fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk time->tm_year = bcd2bin(buf[DS1305_YEAR]) + 100; 21753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 21853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_vdbg(dev, "%s secs=%d, mins=%d, " 21953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", 22053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "read", time->tm_sec, time->tm_min, 22153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell time->tm_hour, time->tm_mday, 22253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell time->tm_mon, time->tm_year, time->tm_wday); 22353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 22453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Time may not be set */ 22553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return rtc_valid_tm(time); 22653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 22753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 22853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int ds1305_set_time(struct device *dev, struct rtc_time *time) 22953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 23053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = dev_get_drvdata(dev); 23153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 buf[1 + DS1305_RTC_LEN]; 23253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 *bp = buf; 23353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 23453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_vdbg(dev, "%s secs=%d, mins=%d, " 23553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", 23653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "write", time->tm_sec, time->tm_min, 23753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell time->tm_hour, time->tm_mday, 23853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell time->tm_mon, time->tm_year, time->tm_wday); 23953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 24053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Write registers starting at the first time/date address. */ 24153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell *bp++ = DS1305_WRITE | DS1305_SEC; 24253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 243fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk *bp++ = bin2bcd(time->tm_sec); 244fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk *bp++ = bin2bcd(time->tm_min); 24553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell *bp++ = hour2bcd(ds1305->hr12, time->tm_hour); 24653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell *bp++ = (time->tm_wday < 7) ? (time->tm_wday + 1) : 1; 247fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk *bp++ = bin2bcd(time->tm_mday); 248fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk *bp++ = bin2bcd(time->tm_mon + 1); 249fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk *bp++ = bin2bcd(time->tm_year - 100); 25053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 25153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(dev, "%s: %02x %02x %02x, %02x %02x %02x %02x\n", 25253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "write", buf[1], buf[2], buf[3], 25353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[4], buf[5], buf[6], buf[7]); 25453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 25553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* use write-then-read since dma from stack is nonportable */ 25653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return spi_write_then_read(ds1305->spi, buf, sizeof buf, 25753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell NULL, 0); 25853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 25953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 26053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 26153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Get/set of alarm is a bit funky: 26253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 26353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * - First there's the inherent raciness of getting the (partitioned) 26453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * status of an alarm that could trigger while we're reading parts 26553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * of that status. 26653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 26753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * - Second there's its limited range (we could increase it a bit by 26853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * relying on WDAY), which means it will easily roll over. 26953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 27053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * - Third there's the choice of two alarms and alarm signals. 27153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Here we use ALM0 and expect that nINT0 (open drain) is used; 27253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * that's the only real option for DS1306 runtime alarms, and is 27353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * natural on DS1305. 27453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 27553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * - Fourth, there's also ALM1, and a second interrupt signal: 27653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * + On DS1305 ALM1 uses nINT1 (when INTCN=1) else nINT0; 27753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * + On DS1306 ALM1 only uses INT1 (an active high pulse) 27853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * and it won't work when VCC1 is active. 27953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 28053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * So to be most general, we should probably set both alarms to the 28153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * same value, letting ALM1 be the wakeup event source on DS1306 28253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * and handling several wiring options on DS1305. 28353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * 28453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * - Fifth, we support the polled mode (as well as possible; why not?) 28553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * even when no interrupt line is wired to an IRQ. 28653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 28753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 28853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 28953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Context: caller holds rtc->ops_lock (to protect ds1305->ctrl) 29053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 29153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int ds1305_get_alarm(struct device *dev, struct rtc_wkalrm *alm) 29253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 29353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = dev_get_drvdata(dev); 29453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_device *spi = ds1305->spi; 29553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 addr; 29653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell int status; 29753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 buf[DS1305_ALM_LEN]; 29853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 29953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Refresh control register cache BEFORE reading ALM0 registers, 30053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * since reading alarm registers acks any pending IRQ. That 30153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * makes returning "pending" status a bit of a lie, but that bit 30253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * of EFI status is at best fragile anyway (given IRQ handlers). 30353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 30453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell addr = DS1305_CONTROL; 30553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(spi, &addr, sizeof addr, 30653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl, sizeof ds1305->ctrl); 30753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 30853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 30953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 31053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->enabled = !!(ds1305->ctrl[0] & DS1305_AEI0); 31153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->pending = !!(ds1305->ctrl[1] & DS1305_AEI0); 31253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 31353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* get and check ALM0 registers */ 31453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell addr = DS1305_ALM0(DS1305_SEC); 31553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(spi, &addr, sizeof addr, 31653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf, sizeof buf); 31753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 31853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 31953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 32053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_vdbg(dev, "%s: %02x %02x %02x %02x\n", 32153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "alm0 read", buf[DS1305_SEC], buf[DS1305_MIN], 32253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[DS1305_HOUR], buf[DS1305_WDAY]); 32353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 32453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if ((DS1305_ALM_DISABLE & buf[DS1305_SEC]) 32553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell || (DS1305_ALM_DISABLE & buf[DS1305_MIN]) 32653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell || (DS1305_ALM_DISABLE & buf[DS1305_HOUR])) 32753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return -EIO; 32853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 32953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Stuff these values into alm->time and let RTC framework code 33053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * fill in the rest ... and also handle rollover to tomorrow when 33153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * that's needed. 33253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 333fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk alm->time.tm_sec = bcd2bin(buf[DS1305_SEC]); 334fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk alm->time.tm_min = bcd2bin(buf[DS1305_MIN]); 33553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->time.tm_hour = bcd2hour(buf[DS1305_HOUR]); 33653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->time.tm_mday = -1; 33753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->time.tm_mon = -1; 33853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->time.tm_year = -1; 33953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* next three fields are unused by Linux */ 34053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->time.tm_wday = -1; 34153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->time.tm_mday = -1; 34253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell alm->time.tm_isdst = -1; 34353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 34453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return 0; 34553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 34653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 34753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 34853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Context: caller holds rtc->ops_lock (to protect ds1305->ctrl) 34953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 35053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int ds1305_set_alarm(struct device *dev, struct rtc_wkalrm *alm) 35153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 35253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = dev_get_drvdata(dev); 35353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_device *spi = ds1305->spi; 35453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell unsigned long now, later; 35553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct rtc_time tm; 35653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell int status; 35753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 buf[1 + DS1305_ALM_LEN]; 35853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 35953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* convert desired alarm to time_t */ 36053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = rtc_tm_to_time(&alm->time, &later); 36153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 36253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 36353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 36453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Read current time as time_t */ 36553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = ds1305_get_time(dev, &tm); 36653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 36753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 36853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = rtc_tm_to_time(&tm, &now); 36953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 37053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 37153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 37253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* make sure alarm fires within the next 24 hours */ 37353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (later <= now) 37453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return -EINVAL; 37553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if ((later - now) > 24 * 60 * 60) 37653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return -EDOM; 37753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 37853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* disable alarm if needed */ 37953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (ds1305->ctrl[0] & DS1305_AEI0) { 38053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[0] &= ~DS1305_AEI0; 38153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 38253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[0] = DS1305_WRITE | DS1305_CONTROL; 38353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1] = ds1305->ctrl[0]; 38453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(ds1305->spi, buf, 2, NULL, 0); 38553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 38653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 38753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 38853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 38953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* write alarm */ 39053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[0] = DS1305_WRITE | DS1305_ALM0(DS1305_SEC); 391fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk buf[1 + DS1305_SEC] = bin2bcd(alm->time.tm_sec); 392fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk buf[1 + DS1305_MIN] = bin2bcd(alm->time.tm_min); 39353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1 + DS1305_HOUR] = hour2bcd(ds1305->hr12, alm->time.tm_hour); 39453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1 + DS1305_WDAY] = DS1305_ALM_DISABLE; 39553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 39653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(dev, "%s: %02x %02x %02x %02x\n", 39753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "alm0 write", buf[1 + DS1305_SEC], buf[1 + DS1305_MIN], 39853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1 + DS1305_HOUR], buf[1 + DS1305_WDAY]); 39953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 40053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(spi, buf, sizeof buf, NULL, 0); 40153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 40253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 40353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 40453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* enable alarm if requested */ 40553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (alm->enabled) { 40653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[0] |= DS1305_AEI0; 40753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 40853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[0] = DS1305_WRITE | DS1305_CONTROL; 40953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1] = ds1305->ctrl[0]; 41053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(ds1305->spi, buf, 2, NULL, 0); 41153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 41253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 41353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 41453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 41553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 41653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#ifdef CONFIG_PROC_FS 41753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 41853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int ds1305_proc(struct device *dev, struct seq_file *seq) 41953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 42053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = dev_get_drvdata(dev); 42153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell char *diodes = "no"; 42253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell char *resistors = ""; 42353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 42453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* ctrl[2] is treated as read-only; no locking needed */ 42553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if ((ds1305->ctrl[2] & 0xf0) == DS1305_TRICKLE_MAGIC) { 42653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell switch (ds1305->ctrl[2] & 0x0c) { 42753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell case DS1305_TRICKLE_DS2: 42853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell diodes = "2 diodes, "; 42953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell break; 43053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell case DS1305_TRICKLE_DS1: 43153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell diodes = "1 diode, "; 43253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell break; 43353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell default: 43453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto done; 43553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 43653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell switch (ds1305->ctrl[2] & 0x03) { 43753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell case DS1305_TRICKLE_2K: 43853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell resistors = "2k Ohm"; 43953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell break; 44053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell case DS1305_TRICKLE_4K: 44153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell resistors = "4k Ohm"; 44253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell break; 44353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell case DS1305_TRICKLE_8K: 44453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell resistors = "8k Ohm"; 44553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell break; 44653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell default: 44753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell diodes = "no"; 44853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell break; 44953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 45053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 45153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 45253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownelldone: 45353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return seq_printf(seq, 45453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "trickle_charge\t: %s%s\n", 45553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell diodes, resistors); 45653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 45753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 45853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#else 45953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#define ds1305_proc NULL 46053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell#endif 46153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 46253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic const struct rtc_class_ops ds1305_ops = { 46353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .ioctl = ds1305_ioctl, 46453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .read_time = ds1305_get_time, 46553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .set_time = ds1305_set_time, 46653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .read_alarm = ds1305_get_alarm, 46753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .set_alarm = ds1305_set_alarm, 46853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .proc = ds1305_proc, 46953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell}; 47053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 47153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic void ds1305_work(struct work_struct *work) 47253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 47353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = container_of(work, struct ds1305, work); 47453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct mutex *lock = &ds1305->rtc->ops_lock; 47553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_device *spi = ds1305->spi; 47653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 buf[3]; 47753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell int status; 47853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 47953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* lock to protect ds1305->ctrl */ 48053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell mutex_lock(lock); 48153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 48253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Disable the IRQ, and clear its status ... for now, we "know" 48353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * that if more than one alarm is active, they're in sync. 48453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Note that reading ALM data registers also clears IRQ status. 48553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 48653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[0] &= ~(DS1305_AEI1 | DS1305_AEI0); 48753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[1] = 0; 48853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 48953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[0] = DS1305_WRITE | DS1305_CONTROL; 49053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1] = ds1305->ctrl[0]; 49153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[2] = 0; 49253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 49353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(spi, buf, sizeof buf, 49453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell NULL, 0); 49553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 49653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "clear irq --> %d\n", status); 49753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 49853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell mutex_unlock(lock); 49953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 50053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (!test_bit(FLAG_EXITING, &ds1305->flags)) 50153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell enable_irq(spi->irq); 50253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 50353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell rtc_update_irq(ds1305->rtc, 1, RTC_AF | RTC_IRQF); 50453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 50553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 50653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 50753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * This "real" IRQ handler hands off to a workqueue mostly to allow 50853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * mutex locking for ds1305->ctrl ... unlike I2C, we could issue async 50953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * I/O requests in IRQ context (to clear the IRQ status). 51053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 51153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic irqreturn_t ds1305_irq(int irq, void *p) 51253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 51353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305 = p; 51453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 51553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell disable_irq(irq); 51653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell schedule_work(&ds1305->work); 51753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return IRQ_HANDLED; 51853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 51953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 52053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/*----------------------------------------------------------------------*/ 52153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 52253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 52353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Interface for NVRAM 52453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 52553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 52653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic void msg_init(struct spi_message *m, struct spi_transfer *x, 52753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 *addr, size_t count, char *tx, char *rx) 52853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 52953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi_message_init(m); 53053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell memset(x, 0, 2 * sizeof(*x)); 53153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 53253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell x->tx_buf = addr; 53353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell x->len = 1; 53453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi_message_add_tail(x, m); 53553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 53653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell x++; 53753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 53853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell x->tx_buf = tx; 53953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell x->rx_buf = rx; 54053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell x->len = count; 54153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi_message_add_tail(x, m); 54253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 54353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 54453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic ssize_t 54553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellds1305_nvram_read(struct kobject *kobj, struct bin_attribute *attr, 54653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell char *buf, loff_t off, size_t count) 54753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 54853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_device *spi; 54953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 addr; 55053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_message m; 55153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_transfer x[2]; 55253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell int status; 55353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 55453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi = container_of(kobj, struct spi_device, dev.kobj); 55553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 55653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (unlikely(off >= DS1305_NVRAM_LEN)) 55753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return 0; 55853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (count >= DS1305_NVRAM_LEN) 55953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell count = DS1305_NVRAM_LEN; 56053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if ((off + count) > DS1305_NVRAM_LEN) 56153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell count = DS1305_NVRAM_LEN - off; 56253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (unlikely(!count)) 56353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return count; 56453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 56553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell addr = DS1305_NVRAM + off; 56653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell msg_init(&m, x, &addr, count, NULL, buf); 56753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 56853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_sync(spi, &m); 56953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 57053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_err(&spi->dev, "nvram %s error %d\n", "read", status); 57153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return (status < 0) ? status : count; 57253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 57353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 57453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic ssize_t 57553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellds1305_nvram_write(struct kobject *kobj, struct bin_attribute *attr, 57653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell char *buf, loff_t off, size_t count) 57753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 57853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_device *spi; 57953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 addr; 58053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_message m; 58153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct spi_transfer x[2]; 58253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell int status; 58353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 58453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi = container_of(kobj, struct spi_device, dev.kobj); 58553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 58653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (unlikely(off >= DS1305_NVRAM_LEN)) 58753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return -EFBIG; 58853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (count >= DS1305_NVRAM_LEN) 58953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell count = DS1305_NVRAM_LEN; 59053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if ((off + count) > DS1305_NVRAM_LEN) 59153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell count = DS1305_NVRAM_LEN - off; 59253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (unlikely(!count)) 59353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return count; 59453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 59553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell addr = (DS1305_WRITE | DS1305_NVRAM) + off; 59653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell msg_init(&m, x, &addr, count, buf, NULL); 59753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 59853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_sync(spi, &m); 59953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 60053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_err(&spi->dev, "nvram %s error %d\n", "write", status); 60153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return (status < 0) ? status : count; 60253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 60353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 60453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic struct bin_attribute nvram = { 60553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .attr.name = "nvram", 60653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .attr.mode = S_IRUGO | S_IWUSR, 60753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .read = ds1305_nvram_read, 60853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .write = ds1305_nvram_write, 60953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .size = DS1305_NVRAM_LEN, 61053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell}; 61153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 61253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/*----------------------------------------------------------------------*/ 61353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 61453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell/* 61553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * Interface to SPI stack 61653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 61753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 61853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int __devinit ds1305_probe(struct spi_device *spi) 61953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 62053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305 *ds1305; 62153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell int status; 62253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 addr, value; 62353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell struct ds1305_platform_data *pdata = spi->dev.platform_data; 62453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell bool write_ctrl = false; 62553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 62653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Sanity check board setup data. This may be hooked up 62753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * in 3wire mode, but we don't care. Note that unless 62853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * there's an inverter in place, this needs SPI_CS_HIGH! 62953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 63053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if ((spi->bits_per_word && spi->bits_per_word != 8) 63153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell || (spi->max_speed_hz > 2000000) 63253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell || !(spi->mode & SPI_CPHA)) 63353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return -EINVAL; 63453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 63553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* set up driver data */ 63653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305 = kzalloc(sizeof *ds1305, GFP_KERNEL); 63753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (!ds1305) 63853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return -ENOMEM; 63953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->spi = spi; 64053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi_set_drvdata(spi, ds1305); 64153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 64253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* read and cache control registers */ 64353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell addr = DS1305_CONTROL; 64453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(spi, &addr, sizeof addr, 64553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl, sizeof ds1305->ctrl); 64653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) { 64753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "can't %s, %d\n", 64853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "read", status); 64953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto fail0; 65053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 65153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 65253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "ctrl %s: %02x %02x %02x\n", 65353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "read", ds1305->ctrl[0], 65453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[1], ds1305->ctrl[2]); 65553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 65653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Sanity check register values ... partially compensating for the 65753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * fact that SPI has no device handshake. A pullup on MISO would 65853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * make these tests fail; but not all systems will have one. If 65953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * some register is neither 0x00 nor 0xff, a chip is likely there. 66053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 66153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if ((ds1305->ctrl[0] & 0x38) != 0 || (ds1305->ctrl[1] & 0xfc) != 0) { 66253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "RTC chip is not present\n"); 66353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = -ENODEV; 66453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto fail0; 66553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 66653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (ds1305->ctrl[2] == 0) 66753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "chip may not be present\n"); 66853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 66953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* enable writes if needed ... if we were paranoid it would 67053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * make sense to enable them only when absolutely necessary. 67153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 67253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (ds1305->ctrl[0] & DS1305_WP) { 67353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 buf[2]; 67453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 67553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[0] &= ~DS1305_WP; 67653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 67753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[0] = DS1305_WRITE | DS1305_CONTROL; 67853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1] = ds1305->ctrl[0]; 67953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(spi, buf, sizeof buf, NULL, 0); 68053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 68153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "clear WP --> %d\n", status); 68253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) 68353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto fail0; 68453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 68553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 68653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* on DS1305, maybe start oscillator; like most low power 68753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * oscillators, it may take a second to stabilize 68853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 68953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (ds1305->ctrl[0] & DS1305_nEOSC) { 69053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[0] &= ~DS1305_nEOSC; 69153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell write_ctrl = true; 69253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_warn(&spi->dev, "SET TIME!\n"); 69353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 69453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 69553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* ack any pending IRQs */ 69653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (ds1305->ctrl[1]) { 69753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[1] = 0; 69853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell write_ctrl = true; 69953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 70053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 70153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* this may need one-time (re)init */ 70253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (pdata) { 70353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* maybe enable trickle charge */ 70453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (((ds1305->ctrl[2] & 0xf0) != DS1305_TRICKLE_MAGIC)) { 70553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[2] = DS1305_TRICKLE_MAGIC 70653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell | pdata->trickle; 70753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell write_ctrl = true; 70853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 70953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 71053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* on DS1306, configure 1 Hz signal */ 71153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (pdata->is_ds1306) { 71253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (pdata->en_1hz) { 71353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (!(ds1305->ctrl[0] & DS1306_1HZ)) { 71453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[0] |= DS1306_1HZ; 71553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell write_ctrl = true; 71653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 71753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } else { 71853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (ds1305->ctrl[0] & DS1306_1HZ) { 71953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[0] &= ~DS1306_1HZ; 72053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell write_ctrl = true; 72153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 72253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 72353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 72453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 72553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 72653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (write_ctrl) { 72753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell u8 buf[4]; 72853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 72953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[0] = DS1305_WRITE | DS1305_CONTROL; 73053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[1] = ds1305->ctrl[0]; 73153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[2] = ds1305->ctrl[1]; 73253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell buf[3] = ds1305->ctrl[2]; 73353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(spi, buf, sizeof buf, NULL, 0); 73453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) { 73553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "can't %s, %d\n", 73653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "write", status); 73753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto fail0; 73853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 73953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 74053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "ctrl %s: %02x %02x %02x\n", 74153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell "write", ds1305->ctrl[0], 74253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->ctrl[1], ds1305->ctrl[2]); 74353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 74453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 74553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* see if non-Linux software set up AM/PM mode */ 74653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell addr = DS1305_HOUR; 74753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = spi_write_then_read(spi, &addr, sizeof addr, 74853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell &value, sizeof value); 74953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) { 75053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "read HOUR --> %d\n", status); 75153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto fail0; 75253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 75353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 75453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell ds1305->hr12 = (DS1305_HR_12 & value) != 0; 75553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (ds1305->hr12) 75653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "AM/PM\n"); 75753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 75853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* register RTC ... from here on, ds1305->ctrl needs locking */ 759b74d2caa64f8e542e9c6716ae6ed4a60d681ea9fAlessandro Zummo ds1305->rtc = rtc_device_register("ds1305", &spi->dev, 76053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell &ds1305_ops, THIS_MODULE); 761b74d2caa64f8e542e9c6716ae6ed4a60d681ea9fAlessandro Zummo if (IS_ERR(ds1305->rtc)) { 762b74d2caa64f8e542e9c6716ae6ed4a60d681ea9fAlessandro Zummo status = PTR_ERR(ds1305->rtc); 76353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "register rtc --> %d\n", status); 76453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto fail0; 76553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 76653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 76753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* Maybe set up alarm IRQ; be ready to handle it triggering right 76853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * away. NOTE that we don't share this. The signal is active low, 76953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * and we can't ack it before a SPI message delay. We temporarily 77053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * disable the IRQ until it's acked, which lets us work with more 77153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell * IRQ trigger modes (not all IRQ controllers can do falling edge). 77253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell */ 77353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (spi->irq) { 77453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell INIT_WORK(&ds1305->work, ds1305_work); 77553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = request_irq(spi->irq, ds1305_irq, 776b74d2caa64f8e542e9c6716ae6ed4a60d681ea9fAlessandro Zummo 0, dev_name(&ds1305->rtc->dev), ds1305); 77753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) { 77853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "request_irq %d --> %d\n", 77953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi->irq, status); 78053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto fail1; 78153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 78226b3c01f7debc1bbc3117bc9c9e016ca6f2e41d5Anton Vorontsov 78326b3c01f7debc1bbc3117bc9c9e016ca6f2e41d5Anton Vorontsov device_set_wakeup_capable(&spi->dev, 1); 78453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 78553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 78653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* export NVRAM */ 78753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell status = sysfs_create_bin_file(&spi->dev.kobj, &nvram); 78853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (status < 0) { 78953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell dev_dbg(&spi->dev, "register nvram --> %d\n", status); 79053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell goto fail2; 79153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 79253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 79353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return 0; 79453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 79553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellfail2: 79653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell free_irq(spi->irq, ds1305); 79753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellfail1: 798b74d2caa64f8e542e9c6716ae6ed4a60d681ea9fAlessandro Zummo rtc_device_unregister(ds1305->rtc); 79953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellfail0: 80053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell kfree(ds1305); 80153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return status; 80253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 80353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 80453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int __devexit ds1305_remove(struct spi_device *spi) 80553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 806b74d2caa64f8e542e9c6716ae6ed4a60d681ea9fAlessandro Zummo struct ds1305 *ds1305 = spi_get_drvdata(spi); 80753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 80853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell sysfs_remove_bin_file(&spi->dev.kobj, &nvram); 80953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 81053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* carefully shut down irq and workqueue, if present */ 81153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell if (spi->irq) { 81253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell set_bit(FLAG_EXITING, &ds1305->flags); 81353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell free_irq(spi->irq, ds1305); 81453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell flush_scheduled_work(); 81553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell } 81653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 81753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell rtc_device_unregister(ds1305->rtc); 81853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi_set_drvdata(spi, NULL); 81953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell kfree(ds1305); 82053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return 0; 82153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 82253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 82353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic struct spi_driver ds1305_driver = { 82453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .driver.name = "rtc-ds1305", 82553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .driver.owner = THIS_MODULE, 82653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .probe = ds1305_probe, 82753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell .remove = __devexit_p(ds1305_remove), 82853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell /* REVISIT add suspend/resume */ 82953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell}; 83053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 83153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic int __init ds1305_init(void) 83253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 83353e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell return spi_register_driver(&ds1305_driver); 83453e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 83553e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellmodule_init(ds1305_init); 83653e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 83753e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellstatic void __exit ds1305_exit(void) 83853e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell{ 83953e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell spi_unregister_driver(&ds1305_driver); 84053e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell} 84153e84b672c1a8190af2b376c35c7a39cf1214f59David Brownellmodule_exit(ds1305_exit); 84253e84b672c1a8190af2b376c35c7a39cf1214f59David Brownell 84353e84b672c1a8190af2b376c35c7a39cf1214f59David BrownellMODULE_DESCRIPTION("RTC driver for DS1305 and DS1306 chips"); 84453e84b672c1a8190af2b376c35c7a39cf1214f59David BrownellMODULE_LICENSE("GPL"); 845e0626e3844e8f430fc1a4417f523a00797df7ca6Anton VorontsovMODULE_ALIAS("spi:rtc-ds1305"); 846