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rtc-ds1307.c
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rtc-ds1307.c
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/*
* rtc-ds1307.c - RTC driver for some mostly-compatible I2C chips.
*
* Copyright (C) 2005 James Chapman (ds1337 core)
* Copyright (C) 2006 David Brownell
* Copyright (C) 2009 Matthias Fuchs (rx8025 support)
* Copyright (C) 2012 Bertrand Achard (nvram access fixes)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/acpi.h>
#include <linux/bcd.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/rtc/ds1307.h>
#include <linux/rtc.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/clk-provider.h>
#include <linux/regmap.h>
/*
* We can't determine type by probing, but if we expect pre-Linux code
* to have set the chip up as a clock (turning on the oscillator and
* setting the date and time), Linux can ignore the non-clock features.
* That's a natural job for a factory or repair bench.
*/
enum ds_type {
ds_1307,
ds_1308,
ds_1337,
ds_1338,
ds_1339,
ds_1340,
ds_1341,
ds_1388,
ds_3231,
m41t0,
m41t00,
mcp794xx,
rx_8025,
rx_8130,
last_ds_type /* always last */
/* rs5c372 too? different address... */
};
/* RTC registers don't differ much, except for the century flag */
#define DS1307_REG_SECS 0x00 /* 00-59 */
# define DS1307_BIT_CH 0x80
# define DS1340_BIT_nEOSC 0x80
# define MCP794XX_BIT_ST 0x80
#define DS1307_REG_MIN 0x01 /* 00-59 */
# define M41T0_BIT_OF 0x80
#define DS1307_REG_HOUR 0x02 /* 00-23, or 1-12{am,pm} */
# define DS1307_BIT_12HR 0x40 /* in REG_HOUR */
# define DS1307_BIT_PM 0x20 /* in REG_HOUR */
# define DS1340_BIT_CENTURY_EN 0x80 /* in REG_HOUR */
# define DS1340_BIT_CENTURY 0x40 /* in REG_HOUR */
#define DS1307_REG_WDAY 0x03 /* 01-07 */
# define MCP794XX_BIT_VBATEN 0x08
#define DS1307_REG_MDAY 0x04 /* 01-31 */
#define DS1307_REG_MONTH 0x05 /* 01-12 */
# define DS1337_BIT_CENTURY 0x80 /* in REG_MONTH */
#define DS1307_REG_YEAR 0x06 /* 00-99 */
/*
* Other registers (control, status, alarms, trickle charge, NVRAM, etc)
* start at 7, and they differ a LOT. Only control and status matter for
* basic RTC date and time functionality; be careful using them.
*/
#define DS1307_REG_CONTROL 0x07 /* or ds1338 */
# define DS1307_BIT_OUT 0x80
# define DS1338_BIT_OSF 0x20
# define DS1307_BIT_SQWE 0x10
# define DS1307_BIT_RS1 0x02
# define DS1307_BIT_RS0 0x01
#define DS1337_REG_CONTROL 0x0e
# define DS1337_BIT_nEOSC 0x80
# define DS1339_BIT_BBSQI 0x20
# define DS3231_BIT_BBSQW 0x40 /* same as BBSQI */
# define DS1337_BIT_RS2 0x10
# define DS1337_BIT_RS1 0x08
# define DS1337_BIT_INTCN 0x04
# define DS1337_BIT_A2IE 0x02
# define DS1337_BIT_A1IE 0x01
#define DS1340_REG_CONTROL 0x07
# define DS1340_BIT_OUT 0x80
# define DS1340_BIT_FT 0x40
# define DS1340_BIT_CALIB_SIGN 0x20
# define DS1340_M_CALIBRATION 0x1f
#define DS1340_REG_FLAG 0x09
# define DS1340_BIT_OSF 0x80
#define DS1337_REG_STATUS 0x0f
# define DS1337_BIT_OSF 0x80
# define DS3231_BIT_EN32KHZ 0x08
# define DS1337_BIT_A2I 0x02
# define DS1337_BIT_A1I 0x01
#define DS1339_REG_ALARM1_SECS 0x07
#define DS13XX_TRICKLE_CHARGER_MAGIC 0xa0
#define RX8025_REG_CTRL1 0x0e
# define RX8025_BIT_2412 0x20
#define RX8025_REG_CTRL2 0x0f
# define RX8025_BIT_PON 0x10
# define RX8025_BIT_VDET 0x40
# define RX8025_BIT_XST 0x20
struct ds1307 {
struct nvmem_config nvmem_cfg;
enum ds_type type;
unsigned long flags;
#define HAS_NVRAM 0 /* bit 0 == sysfs file active */
#define HAS_ALARM 1 /* bit 1 == irq claimed */
struct device *dev;
struct regmap *regmap;
const char *name;
struct rtc_device *rtc;
#ifdef CONFIG_COMMON_CLK
struct clk_hw clks[2];
#endif
};
struct chip_desc {
unsigned alarm:1;
u16 nvram_offset;
u16 nvram_size;
u8 offset; /* register's offset */
u8 century_reg;
u8 century_enable_bit;
u8 century_bit;
u8 bbsqi_bit;
irq_handler_t irq_handler;
const struct rtc_class_ops *rtc_ops;
u16 trickle_charger_reg;
u8 (*do_trickle_setup)(struct ds1307 *, u32,
bool);
};
static int ds1307_get_time(struct device *dev, struct rtc_time *t);
static int ds1307_set_time(struct device *dev, struct rtc_time *t);
static u8 do_trickle_setup_ds1339(struct ds1307 *, u32 ohms, bool diode);
static irqreturn_t rx8130_irq(int irq, void *dev_id);
static int rx8130_read_alarm(struct device *dev, struct rtc_wkalrm *t);
static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t);
static int rx8130_alarm_irq_enable(struct device *dev, unsigned int enabled);
static irqreturn_t mcp794xx_irq(int irq, void *dev_id);
static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t);
static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t);
static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled);
static const struct rtc_class_ops rx8130_rtc_ops = {
.read_time = ds1307_get_time,
.set_time = ds1307_set_time,
.read_alarm = rx8130_read_alarm,
.set_alarm = rx8130_set_alarm,
.alarm_irq_enable = rx8130_alarm_irq_enable,
};
static const struct rtc_class_ops mcp794xx_rtc_ops = {
.read_time = ds1307_get_time,
.set_time = ds1307_set_time,
.read_alarm = mcp794xx_read_alarm,
.set_alarm = mcp794xx_set_alarm,
.alarm_irq_enable = mcp794xx_alarm_irq_enable,
};
static const struct chip_desc chips[last_ds_type] = {
[ds_1307] = {
.nvram_offset = 8,
.nvram_size = 56,
},
[ds_1308] = {
.nvram_offset = 8,
.nvram_size = 56,
},
[ds_1337] = {
.alarm = 1,
.century_reg = DS1307_REG_MONTH,
.century_bit = DS1337_BIT_CENTURY,
},
[ds_1338] = {
.nvram_offset = 8,
.nvram_size = 56,
},
[ds_1339] = {
.alarm = 1,
.century_reg = DS1307_REG_MONTH,
.century_bit = DS1337_BIT_CENTURY,
.bbsqi_bit = DS1339_BIT_BBSQI,
.trickle_charger_reg = 0x10,
.do_trickle_setup = &do_trickle_setup_ds1339,
},
[ds_1340] = {
.century_reg = DS1307_REG_HOUR,
.century_enable_bit = DS1340_BIT_CENTURY_EN,
.century_bit = DS1340_BIT_CENTURY,
.trickle_charger_reg = 0x08,
},
[ds_1341] = {
.century_reg = DS1307_REG_MONTH,
.century_bit = DS1337_BIT_CENTURY,
},
[ds_1388] = {
.offset = 1,
.trickle_charger_reg = 0x0a,
},
[ds_3231] = {
.alarm = 1,
.century_reg = DS1307_REG_MONTH,
.century_bit = DS1337_BIT_CENTURY,
.bbsqi_bit = DS3231_BIT_BBSQW,
},
[rx_8130] = {
.alarm = 1,
/* this is battery backed SRAM */
.nvram_offset = 0x20,
.nvram_size = 4, /* 32bit (4 word x 8 bit) */
.offset = 0x10,
.irq_handler = rx8130_irq,
.rtc_ops = &rx8130_rtc_ops,
},
[mcp794xx] = {
.alarm = 1,
/* this is battery backed SRAM */
.nvram_offset = 0x20,
.nvram_size = 0x40,
.irq_handler = mcp794xx_irq,
.rtc_ops = &mcp794xx_rtc_ops,
},
};
static const struct i2c_device_id ds1307_id[] = {
{ "ds1307", ds_1307 },
{ "ds1308", ds_1308 },
{ "ds1337", ds_1337 },
{ "ds1338", ds_1338 },
{ "ds1339", ds_1339 },
{ "ds1388", ds_1388 },
{ "ds1340", ds_1340 },
{ "ds1341", ds_1341 },
{ "ds3231", ds_3231 },
{ "m41t0", m41t0 },
{ "m41t00", m41t00 },
{ "mcp7940x", mcp794xx },
{ "mcp7941x", mcp794xx },
{ "pt7c4338", ds_1307 },
{ "rx8025", rx_8025 },
{ "isl12057", ds_1337 },
{ "rx8130", rx_8130 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ds1307_id);
#ifdef CONFIG_OF
static const struct of_device_id ds1307_of_match[] = {
{
.compatible = "dallas,ds1307",
.data = (void *)ds_1307
},
{
.compatible = "dallas,ds1308",
.data = (void *)ds_1308
},
{
.compatible = "dallas,ds1337",
.data = (void *)ds_1337
},
{
.compatible = "dallas,ds1338",
.data = (void *)ds_1338
},
{
.compatible = "dallas,ds1339",
.data = (void *)ds_1339
},
{
.compatible = "dallas,ds1388",
.data = (void *)ds_1388
},
{
.compatible = "dallas,ds1340",
.data = (void *)ds_1340
},
{
.compatible = "dallas,ds1341",
.data = (void *)ds_1341
},
{
.compatible = "maxim,ds3231",
.data = (void *)ds_3231
},
{
.compatible = "st,m41t0",
.data = (void *)m41t00
},
{
.compatible = "st,m41t00",
.data = (void *)m41t00
},
{
.compatible = "microchip,mcp7940x",
.data = (void *)mcp794xx
},
{
.compatible = "microchip,mcp7941x",
.data = (void *)mcp794xx
},
{
.compatible = "pericom,pt7c4338",
.data = (void *)ds_1307
},
{
.compatible = "epson,rx8025",
.data = (void *)rx_8025
},
{
.compatible = "isil,isl12057",
.data = (void *)ds_1337
},
{ }
};
MODULE_DEVICE_TABLE(of, ds1307_of_match);
#endif
#ifdef CONFIG_ACPI
static const struct acpi_device_id ds1307_acpi_ids[] = {
{ .id = "DS1307", .driver_data = ds_1307 },
{ .id = "DS1308", .driver_data = ds_1308 },
{ .id = "DS1337", .driver_data = ds_1337 },
{ .id = "DS1338", .driver_data = ds_1338 },
{ .id = "DS1339", .driver_data = ds_1339 },
{ .id = "DS1388", .driver_data = ds_1388 },
{ .id = "DS1340", .driver_data = ds_1340 },
{ .id = "DS1341", .driver_data = ds_1341 },
{ .id = "DS3231", .driver_data = ds_3231 },
{ .id = "M41T0", .driver_data = m41t0 },
{ .id = "M41T00", .driver_data = m41t00 },
{ .id = "MCP7940X", .driver_data = mcp794xx },
{ .id = "MCP7941X", .driver_data = mcp794xx },
{ .id = "PT7C4338", .driver_data = ds_1307 },
{ .id = "RX8025", .driver_data = rx_8025 },
{ .id = "ISL12057", .driver_data = ds_1337 },
{ }
};
MODULE_DEVICE_TABLE(acpi, ds1307_acpi_ids);
#endif
/*
* The ds1337 and ds1339 both have two alarms, but we only use the first
* one (with a "seconds" field). For ds1337 we expect nINTA is our alarm
* signal; ds1339 chips have only one alarm signal.
*/
static irqreturn_t ds1307_irq(int irq, void *dev_id)
{
struct ds1307 *ds1307 = dev_id;
struct mutex *lock = &ds1307->rtc->ops_lock;
int stat, ret;
mutex_lock(lock);
ret = regmap_read(ds1307->regmap, DS1337_REG_STATUS, &stat);
if (ret)
goto out;
if (stat & DS1337_BIT_A1I) {
stat &= ~DS1337_BIT_A1I;
regmap_write(ds1307->regmap, DS1337_REG_STATUS, stat);
ret = regmap_update_bits(ds1307->regmap, DS1337_REG_CONTROL,
DS1337_BIT_A1IE, 0);
if (ret)
goto out;
rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
}
out:
mutex_unlock(lock);
return IRQ_HANDLED;
}
/*----------------------------------------------------------------------*/
static int ds1307_get_time(struct device *dev, struct rtc_time *t)
{
struct ds1307 *ds1307 = dev_get_drvdata(dev);
int tmp, ret;
const struct chip_desc *chip = &chips[ds1307->type];
u8 regs[7];
/* read the RTC date and time registers all at once */
ret = regmap_bulk_read(ds1307->regmap, chip->offset, regs,
sizeof(regs));
if (ret) {
dev_err(dev, "%s error %d\n", "read", ret);
return ret;
}
dev_dbg(dev, "%s: %7ph\n", "read", regs);
/* if oscillator fail bit is set, no data can be trusted */
if (ds1307->type == m41t0 &&
regs[DS1307_REG_MIN] & M41T0_BIT_OF) {
dev_warn_once(dev, "oscillator failed, set time!\n");
return -EINVAL;
}
t->tm_sec = bcd2bin(regs[DS1307_REG_SECS] & 0x7f);
t->tm_min = bcd2bin(regs[DS1307_REG_MIN] & 0x7f);
tmp = regs[DS1307_REG_HOUR] & 0x3f;
t->tm_hour = bcd2bin(tmp);
t->tm_wday = bcd2bin(regs[DS1307_REG_WDAY] & 0x07) - 1;
t->tm_mday = bcd2bin(regs[DS1307_REG_MDAY] & 0x3f);
tmp = regs[DS1307_REG_MONTH] & 0x1f;
t->tm_mon = bcd2bin(tmp) - 1;
t->tm_year = bcd2bin(regs[DS1307_REG_YEAR]) + 100;
if (regs[chip->century_reg] & chip->century_bit &&
IS_ENABLED(CONFIG_RTC_DRV_DS1307_CENTURY))
t->tm_year += 100;
dev_dbg(dev, "%s secs=%d, mins=%d, "
"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
"read", t->tm_sec, t->tm_min,
t->tm_hour, t->tm_mday,
t->tm_mon, t->tm_year, t->tm_wday);
/* initial clock setting can be undefined */
return rtc_valid_tm(t);
}
static int ds1307_set_time(struct device *dev, struct rtc_time *t)
{
struct ds1307 *ds1307 = dev_get_drvdata(dev);
const struct chip_desc *chip = &chips[ds1307->type];
int result;
int tmp;
u8 regs[7];
dev_dbg(dev, "%s secs=%d, mins=%d, "
"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
"write", t->tm_sec, t->tm_min,
t->tm_hour, t->tm_mday,
t->tm_mon, t->tm_year, t->tm_wday);
if (t->tm_year < 100)
return -EINVAL;
#ifdef CONFIG_RTC_DRV_DS1307_CENTURY
if (t->tm_year > (chip->century_bit ? 299 : 199))
return -EINVAL;
#else
if (t->tm_year > 199)
return -EINVAL;
#endif
regs[DS1307_REG_SECS] = bin2bcd(t->tm_sec);
regs[DS1307_REG_MIN] = bin2bcd(t->tm_min);
regs[DS1307_REG_HOUR] = bin2bcd(t->tm_hour);
regs[DS1307_REG_WDAY] = bin2bcd(t->tm_wday + 1);
regs[DS1307_REG_MDAY] = bin2bcd(t->tm_mday);
regs[DS1307_REG_MONTH] = bin2bcd(t->tm_mon + 1);
/* assume 20YY not 19YY */
tmp = t->tm_year - 100;
regs[DS1307_REG_YEAR] = bin2bcd(tmp);
if (chip->century_enable_bit)
regs[chip->century_reg] |= chip->century_enable_bit;
if (t->tm_year > 199 && chip->century_bit)
regs[chip->century_reg] |= chip->century_bit;
if (ds1307->type == mcp794xx) {
/*
* these bits were cleared when preparing the date/time
* values and need to be set again before writing the
* regsfer out to the device.
*/
regs[DS1307_REG_SECS] |= MCP794XX_BIT_ST;
regs[DS1307_REG_WDAY] |= MCP794XX_BIT_VBATEN;
}
dev_dbg(dev, "%s: %7ph\n", "write", regs);
result = regmap_bulk_write(ds1307->regmap, chip->offset, regs,
sizeof(regs));
if (result) {
dev_err(dev, "%s error %d\n", "write", result);
return result;
}
return 0;
}
static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t)
{
struct ds1307 *ds1307 = dev_get_drvdata(dev);
int ret;
u8 regs[9];
if (!test_bit(HAS_ALARM, &ds1307->flags))
return -EINVAL;
/* read all ALARM1, ALARM2, and status registers at once */
ret = regmap_bulk_read(ds1307->regmap, DS1339_REG_ALARM1_SECS,
regs, sizeof(regs));
if (ret) {
dev_err(dev, "%s error %d\n", "alarm read", ret);
return ret;
}
dev_dbg(dev, "%s: %4ph, %3ph, %2ph\n", "alarm read",
®s[0], ®s[4], ®s[7]);
/*
* report alarm time (ALARM1); assume 24 hour and day-of-month modes,
* and that all four fields are checked matches
*/
t->time.tm_sec = bcd2bin(regs[0] & 0x7f);
t->time.tm_min = bcd2bin(regs[1] & 0x7f);
t->time.tm_hour = bcd2bin(regs[2] & 0x3f);
t->time.tm_mday = bcd2bin(regs[3] & 0x3f);
/* ... and status */
t->enabled = !!(regs[7] & DS1337_BIT_A1IE);
t->pending = !!(regs[8] & DS1337_BIT_A1I);
dev_dbg(dev, "%s secs=%d, mins=%d, "
"hours=%d, mday=%d, enabled=%d, pending=%d\n",
"alarm read", t->time.tm_sec, t->time.tm_min,
t->time.tm_hour, t->time.tm_mday,
t->enabled, t->pending);
return 0;
}
static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
{
struct ds1307 *ds1307 = dev_get_drvdata(dev);
unsigned char regs[9];
u8 control, status;
int ret;
if (!test_bit(HAS_ALARM, &ds1307->flags))
return -EINVAL;
dev_dbg(dev, "%s secs=%d, mins=%d, "
"hours=%d, mday=%d, enabled=%d, pending=%d\n",
"alarm set", t->time.tm_sec, t->time.tm_min,
t->time.tm_hour, t->time.tm_mday,
t->enabled, t->pending);
/* read current status of both alarms and the chip */
ret = regmap_bulk_read(ds1307->regmap, DS1339_REG_ALARM1_SECS, regs,
sizeof(regs));
if (ret) {
dev_err(dev, "%s error %d\n", "alarm write", ret);
return ret;
}
control = regs[7];
status = regs[8];
dev_dbg(dev, "%s: %4ph, %3ph, %02x %02x\n", "alarm set (old status)",
®s[0], ®s[4], control, status);
/* set ALARM1, using 24 hour and day-of-month modes */
regs[0] = bin2bcd(t->time.tm_sec);
regs[1] = bin2bcd(t->time.tm_min);
regs[2] = bin2bcd(t->time.tm_hour);
regs[3] = bin2bcd(t->time.tm_mday);
/* set ALARM2 to non-garbage */
regs[4] = 0;
regs[5] = 0;
regs[6] = 0;
/* disable alarms */
regs[7] = control & ~(DS1337_BIT_A1IE | DS1337_BIT_A2IE);
regs[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I);
ret = regmap_bulk_write(ds1307->regmap, DS1339_REG_ALARM1_SECS, regs,
sizeof(regs));
if (ret) {
dev_err(dev, "can't set alarm time\n");
return ret;
}
/* optionally enable ALARM1 */
if (t->enabled) {
dev_dbg(dev, "alarm IRQ armed\n");
regs[7] |= DS1337_BIT_A1IE; /* only ALARM1 is used */
regmap_write(ds1307->regmap, DS1337_REG_CONTROL, regs[7]);
}
return 0;
}
static int ds1307_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct ds1307 *ds1307 = dev_get_drvdata(dev);
if (!test_bit(HAS_ALARM, &ds1307->flags))
return -ENOTTY;
return regmap_update_bits(ds1307->regmap, DS1337_REG_CONTROL,
DS1337_BIT_A1IE,
enabled ? DS1337_BIT_A1IE : 0);
}
static const struct rtc_class_ops ds13xx_rtc_ops = {
.read_time = ds1307_get_time,
.set_time = ds1307_set_time,
.read_alarm = ds1337_read_alarm,
.set_alarm = ds1337_set_alarm,
.alarm_irq_enable = ds1307_alarm_irq_enable,
};
/*----------------------------------------------------------------------*/
/*
* Alarm support for rx8130 devices.
*/
#define RX8130_REG_ALARM_MIN 0x07
#define RX8130_REG_ALARM_HOUR 0x08
#define RX8130_REG_ALARM_WEEK_OR_DAY 0x09
#define RX8130_REG_EXTENSION 0x0c
#define RX8130_REG_EXTENSION_WADA BIT(3)
#define RX8130_REG_FLAG 0x0d
#define RX8130_REG_FLAG_AF BIT(3)
#define RX8130_REG_CONTROL0 0x0e
#define RX8130_REG_CONTROL0_AIE BIT(3)
static irqreturn_t rx8130_irq(int irq, void *dev_id)
{
struct ds1307 *ds1307 = dev_id;
struct mutex *lock = &ds1307->rtc->ops_lock;
u8 ctl[3];
int ret;
mutex_lock(lock);
/* Read control registers. */
ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
sizeof(ctl));
if (ret < 0)
goto out;
if (!(ctl[1] & RX8130_REG_FLAG_AF))
goto out;
ctl[1] &= ~RX8130_REG_FLAG_AF;
ctl[2] &= ~RX8130_REG_CONTROL0_AIE;
ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
sizeof(ctl));
if (ret < 0)
goto out;
rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
out:
mutex_unlock(lock);
return IRQ_HANDLED;
}
static int rx8130_read_alarm(struct device *dev, struct rtc_wkalrm *t)
{
struct ds1307 *ds1307 = dev_get_drvdata(dev);
u8 ald[3], ctl[3];
int ret;
if (!test_bit(HAS_ALARM, &ds1307->flags))
return -EINVAL;
/* Read alarm registers. */
ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_ALARM_MIN, ald,
sizeof(ald));
if (ret < 0)
return ret;
/* Read control registers. */
ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
sizeof(ctl));
if (ret < 0)
return ret;
t->enabled = !!(ctl[2] & RX8130_REG_CONTROL0_AIE);
t->pending = !!(ctl[1] & RX8130_REG_FLAG_AF);
/* Report alarm 0 time assuming 24-hour and day-of-month modes. */
t->time.tm_sec = -1;
t->time.tm_min = bcd2bin(ald[0] & 0x7f);
t->time.tm_hour = bcd2bin(ald[1] & 0x7f);
t->time.tm_wday = -1;
t->time.tm_mday = bcd2bin(ald[2] & 0x7f);
t->time.tm_mon = -1;
t->time.tm_year = -1;
t->time.tm_yday = -1;
t->time.tm_isdst = -1;
dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d enabled=%d\n",
__func__, t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
t->time.tm_wday, t->time.tm_mday, t->time.tm_mon, t->enabled);
return 0;
}
static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t)
{
struct ds1307 *ds1307 = dev_get_drvdata(dev);
u8 ald[3], ctl[3];
int ret;
if (!test_bit(HAS_ALARM, &ds1307->flags))
return -EINVAL;
dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d "
"enabled=%d pending=%d\n", __func__,
t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
t->time.tm_wday, t->time.tm_mday, t->time.tm_mon,
t->enabled, t->pending);
/* Read control registers. */
ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
sizeof(ctl));
if (ret < 0)
return ret;
ctl[0] &= ~RX8130_REG_EXTENSION_WADA;
ctl[1] |= RX8130_REG_FLAG_AF;
ctl[2] &= ~RX8130_REG_CONTROL0_AIE;
ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
sizeof(ctl));
if (ret < 0)
return ret;
/* Hardware alarm precision is 1 minute! */
ald[0] = bin2bcd(t->time.tm_min);
ald[1] = bin2bcd(t->time.tm_hour);
ald[2] = bin2bcd(t->time.tm_mday);
ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_ALARM_MIN, ald,
sizeof(ald));
if (ret < 0)
return ret;
if (!t->enabled)
return 0;
ctl[2] |= RX8130_REG_CONTROL0_AIE;
return regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
sizeof(ctl));
}
static int rx8130_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct ds1307 *ds1307 = dev_get_drvdata(dev);
int ret, reg;
if (!test_bit(HAS_ALARM, &ds1307->flags))
return -EINVAL;
ret = regmap_read(ds1307->regmap, RX8130_REG_CONTROL0, ®);
if (ret < 0)
return ret;
if (enabled)
reg |= RX8130_REG_CONTROL0_AIE;
else
reg &= ~RX8130_REG_CONTROL0_AIE;
return regmap_write(ds1307->regmap, RX8130_REG_CONTROL0, reg);
}
/*----------------------------------------------------------------------*/
/*
* Alarm support for mcp794xx devices.
*/
#define MCP794XX_REG_WEEKDAY 0x3
#define MCP794XX_REG_WEEKDAY_WDAY_MASK 0x7
#define MCP794XX_REG_CONTROL 0x07
# define MCP794XX_BIT_ALM0_EN 0x10
# define MCP794XX_BIT_ALM1_EN 0x20
#define MCP794XX_REG_ALARM0_BASE 0x0a
#define MCP794XX_REG_ALARM0_CTRL 0x0d
#define MCP794XX_REG_ALARM1_BASE 0x11
#define MCP794XX_REG_ALARM1_CTRL 0x14
# define MCP794XX_BIT_ALMX_IF BIT(3)
# define MCP794XX_BIT_ALMX_C0 BIT(4)
# define MCP794XX_BIT_ALMX_C1 BIT(5)
# define MCP794XX_BIT_ALMX_C2 BIT(6)
# define MCP794XX_BIT_ALMX_POL BIT(7)
# define MCP794XX_MSK_ALMX_MATCH (MCP794XX_BIT_ALMX_C0 | \
MCP794XX_BIT_ALMX_C1 | \
MCP794XX_BIT_ALMX_C2)
static irqreturn_t mcp794xx_irq(int irq, void *dev_id)
{
struct ds1307 *ds1307 = dev_id;
struct mutex *lock = &ds1307->rtc->ops_lock;
int reg, ret;
mutex_lock(lock);
/* Check and clear alarm 0 interrupt flag. */
ret = regmap_read(ds1307->regmap, MCP794XX_REG_ALARM0_CTRL, ®);
if (ret)
goto out;
if (!(reg & MCP794XX_BIT_ALMX_IF))
goto out;
reg &= ~MCP794XX_BIT_ALMX_IF;
ret = regmap_write(ds1307->regmap, MCP794XX_REG_ALARM0_CTRL, reg);
if (ret)
goto out;
/* Disable alarm 0. */
ret = regmap_update_bits(ds1307->regmap, MCP794XX_REG_CONTROL,
MCP794XX_BIT_ALM0_EN, 0);
if (ret)
goto out;
rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
out:
mutex_unlock(lock);
return IRQ_HANDLED;
}
static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t)
{
struct ds1307 *ds1307 = dev_get_drvdata(dev);
u8 regs[10];
int ret;
if (!test_bit(HAS_ALARM, &ds1307->flags))
return -EINVAL;
/* Read control and alarm 0 registers. */
ret = regmap_bulk_read(ds1307->regmap, MCP794XX_REG_CONTROL, regs,
sizeof(regs));
if (ret)
return ret;
t->enabled = !!(regs[0] & MCP794XX_BIT_ALM0_EN);
/* Report alarm 0 time assuming 24-hour and day-of-month modes. */
t->time.tm_sec = bcd2bin(regs[3] & 0x7f);
t->time.tm_min = bcd2bin(regs[4] & 0x7f);
t->time.tm_hour = bcd2bin(regs[5] & 0x3f);
t->time.tm_wday = bcd2bin(regs[6] & 0x7) - 1;
t->time.tm_mday = bcd2bin(regs[7] & 0x3f);
t->time.tm_mon = bcd2bin(regs[8] & 0x1f) - 1;
t->time.tm_year = -1;
t->time.tm_yday = -1;
t->time.tm_isdst = -1;
dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d "
"enabled=%d polarity=%d irq=%d match=%lu\n", __func__,
t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
t->time.tm_wday, t->time.tm_mday, t->time.tm_mon, t->enabled,
!!(regs[6] & MCP794XX_BIT_ALMX_POL),
!!(regs[6] & MCP794XX_BIT_ALMX_IF),
(regs[6] & MCP794XX_MSK_ALMX_MATCH) >> 4);
return 0;
}
static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t)
{
struct ds1307 *ds1307 = dev_get_drvdata(dev);
unsigned char regs[10];
int ret;
if (!test_bit(HAS_ALARM, &ds1307->flags))
return -EINVAL;
dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d "
"enabled=%d pending=%d\n", __func__,
t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
t->time.tm_wday, t->time.tm_mday, t->time.tm_mon,
t->enabled, t->pending);
/* Read control and alarm 0 registers. */
ret = regmap_bulk_read(ds1307->regmap, MCP794XX_REG_CONTROL, regs,
sizeof(regs));
if (ret)
return ret;
/* Set alarm 0, using 24-hour and day-of-month modes. */
regs[3] = bin2bcd(t->time.tm_sec);
regs[4] = bin2bcd(t->time.tm_min);
regs[5] = bin2bcd(t->time.tm_hour);
regs[6] = bin2bcd(t->time.tm_wday + 1);
regs[7] = bin2bcd(t->time.tm_mday);
regs[8] = bin2bcd(t->time.tm_mon + 1);
/* Clear the alarm 0 interrupt flag. */
regs[6] &= ~MCP794XX_BIT_ALMX_IF;
/* Set alarm match: second, minute, hour, day, date, month. */
regs[6] |= MCP794XX_MSK_ALMX_MATCH;
/* Disable interrupt. We will not enable until completely programmed */
regs[0] &= ~MCP794XX_BIT_ALM0_EN;
ret = regmap_bulk_write(ds1307->regmap, MCP794XX_REG_CONTROL, regs,
sizeof(regs));
if (ret)
return ret;
if (!t->enabled)
return 0;
regs[0] |= MCP794XX_BIT_ALM0_EN;
return regmap_write(ds1307->regmap, MCP794XX_REG_CONTROL, regs[0]);
}
static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct ds1307 *ds1307 = dev_get_drvdata(dev);
if (!test_bit(HAS_ALARM, &ds1307->flags))
return -EINVAL;
return regmap_update_bits(ds1307->regmap, MCP794XX_REG_CONTROL,
MCP794XX_BIT_ALM0_EN,
enabled ? MCP794XX_BIT_ALM0_EN : 0);
}
/*----------------------------------------------------------------------*/
static int ds1307_nvram_read(void *priv, unsigned int offset, void *val,
size_t bytes)
{
struct ds1307 *ds1307 = priv;
const struct chip_desc *chip = &chips[ds1307->type];
return regmap_bulk_read(ds1307->regmap, chip->nvram_offset + offset,
val, bytes);
}
static int ds1307_nvram_write(void *priv, unsigned int offset, void *val,
size_t bytes)
{
struct ds1307 *ds1307 = priv;
const struct chip_desc *chip = &chips[ds1307->type];
return regmap_bulk_write(ds1307->regmap, chip->nvram_offset + offset,
val, bytes);
}
/*----------------------------------------------------------------------*/
static u8 do_trickle_setup_ds1339(struct ds1307 *ds1307,
u32 ohms, bool diode)
{
u8 setup = (diode) ? DS1307_TRICKLE_CHARGER_DIODE :
DS1307_TRICKLE_CHARGER_NO_DIODE;
switch (ohms) {
case 250:
setup |= DS1307_TRICKLE_CHARGER_250_OHM;
break;
case 2000:
setup |= DS1307_TRICKLE_CHARGER_2K_OHM;
break;
case 4000:
setup |= DS1307_TRICKLE_CHARGER_4K_OHM;
break;
default:
dev_warn(ds1307->dev,
"Unsupported ohm value %u in dt\n", ohms);
return 0;
}
return setup;
}
static u8 ds1307_trickle_init(struct ds1307 *ds1307,
const struct chip_desc *chip)
{
u32 ohms;
bool diode = true;
if (!chip->do_trickle_setup)
return 0;
if (device_property_read_u32(ds1307->dev, "trickle-resistor-ohms",
&ohms))
return 0;
if (device_property_read_bool(ds1307->dev, "trickle-diode-disable"))