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tegrakernel/kernel/kernel-4.9/drivers/rtc/rtc-rx6110.c

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initial commit tegra kernel 32.6.1
2022-02-16 09:13:02 -06:00
/*
* Driver for the Epson RTC module RX-6110 SA
* Copyright(C) 2017 NVIDIA CORPORATION. All rights reserved.
* Copyright(C) 2015 Pengutronix, Steffen Trumtrar <kernel@pengutronix.de>
* Copyright(C) SEIKO EPSON CORPORATION 2013. All rights reserved.
*
* This driver software is distributed as is, without any warranty of any kind,
* either express or implied as further specified in the GNU Public License.
* This software may be used and distributed according to the terms of the GNU
* Public License, version 2 as published by the Free Software Foundation.
* See the file COPYING in the main directory of this archive for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/bcd.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/i2c.h>
#include <linux/spi/spi.h>
/* RX-6110 Register definitions */
#define RX6110_REG_SEC 0x10
#define RX6110_REG_MIN 0x11
#define RX6110_REG_HOUR 0x12
#define RX6110_REG_WDAY 0x13
#define RX6110_REG_MDAY 0x14
#define RX6110_REG_MONTH 0x15
#define RX6110_REG_YEAR 0x16
#define RX6110_REG_RES1 0x17
#define RX6110_REG_ALMIN 0x18
#define RX6110_REG_ALHOUR 0x19
#define RX6110_REG_ALWDAY 0x1A
#define RX6110_REG_TCOUNT0 0x1B
#define RX6110_REG_TCOUNT1 0x1C
#define RX6110_REG_EXT 0x1D
#define RX6110_REG_FLAG 0x1E
#define RX6110_REG_CTRL 0x1F
#define RX6110_REG_USER0 0x20
#define RX6110_REG_USER1 0x21
#define RX6110_REG_USER2 0x22
#define RX6110_REG_USER3 0x23
#define RX6110_REG_USER4 0x24
#define RX6110_REG_USER5 0x25
#define RX6110_REG_USER6 0x26
#define RX6110_REG_USER7 0x27
#define RX6110_REG_USER8 0x28
#define RX6110_REG_USER9 0x29
#define RX6110_REG_USERA 0x2A
#define RX6110_REG_USERB 0x2B
#define RX6110_REG_USERC 0x2C
#define RX6110_REG_USERD 0x2D
#define RX6110_REG_USERE 0x2E
#define RX6110_REG_USERF 0x2F
#define RX6110_REG_RES2 0x30
#define RX6110_REG_RES3 0x31
#define RX6110_REG_IRQ 0x32
#define RX6110_BIT_ALARM_EN BIT(7)
/* Extension Register (1Dh) bit positions */
#define RX6110_BIT_EXT_TSEL0 BIT(0)
#define RX6110_BIT_EXT_TSEL1 BIT(1)
#define RX6110_BIT_EXT_TSEL2 BIT(2)
#define RX6110_BIT_EXT_WADA BIT(3)
#define RX6110_BIT_EXT_TE BIT(4)
#define RX6110_BIT_EXT_USEL BIT(5)
#define RX6110_BIT_EXT_FSEL0 BIT(6)
#define RX6110_BIT_EXT_FSEL1 BIT(7)
/* Flag Register (1Eh) bit positions */
#define RX6110_BIT_FLAG_VLF BIT(1)
#define RX6110_BIT_FLAG_AF BIT(3)
#define RX6110_BIT_FLAG_TF BIT(4)
#define RX6110_BIT_FLAG_UF BIT(5)
/* Control Register (1Fh) bit positions */
#define RX6110_BIT_CTRL_TBKE BIT(0)
#define RX6110_BIT_CTRL_TBKON BIT(1)
#define RX6110_BIT_CTRL_TSTP BIT(2)
#define RX6110_BIT_CTRL_AIE BIT(3)
#define RX6110_BIT_CTRL_TIE BIT(4)
#define RX6110_BIT_CTRL_UIE BIT(5)
#define RX6110_BIT_CTRL_STOP BIT(6)
#define RX6110_BIT_CTRL_TEST BIT(7)
#define RX6110_ALARM_LEN 3
#define RW_MODE (S_IWUSR | S_IRUGO)
#define RX6110_DRIVER_NAME "rx6110"
enum {
RTC_SEC = 0,
RTC_MIN,
RTC_HOUR,
RTC_WDAY,
RTC_MDAY,
RTC_MONTH,
RTC_YEAR,
RTC_NR_TIME
};
struct rx6110_data {
struct rtc_device *rtc;
struct regmap *regmap;
struct mutex lock;
const struct regmap_irq_chip *irqchip;
int irq;
int virq;
struct regmap_irq_chip_data *irq_data;
};
/*Add irq_chip configuration*/
static const struct regmap_irq rx6110_irqs[] = {
/* RTC interrupts */
REGMAP_IRQ_REG(0, 0, RX6110_BIT_FLAG_AF),
REGMAP_IRQ_REG(1, 0, RX6110_BIT_FLAG_TF),
REGMAP_IRQ_REG(2, 0, RX6110_BIT_FLAG_VLF),
REGMAP_IRQ_REG(3, 0, RX6110_BIT_FLAG_UF),
};
static const struct regmap_irq_chip rx6110_irq_chip = {
.name = "rx6110-rtc",
.status_base = RX6110_REG_FLAG,
.mask_base = RX6110_REG_CTRL,
.num_regs = 1,
.irqs = rx6110_irqs,
.num_irqs = ARRAY_SIZE(rx6110_irqs),
.mask_invert = 1,
};
/**
* rx6110_rtc_tm_to_data - convert rtc_time to native time encoding
*
* @tm: holds date and time
* @data: holds the encoding in rx6110 native form
*/
static int rx6110_rtc_tm_to_data(struct rtc_time *tm, u8 *data)
{
pr_debug("%s: date %ds %dm %dh %dmd %dm %dy\n", __func__,
tm->tm_sec, tm->tm_min, tm->tm_hour,
tm->tm_mday, tm->tm_mon, tm->tm_year);
/*
* The year in the RTC is a value between 0 and 99.
* Assume that this represents the current century
* and disregard all other values.
*/
if (tm->tm_year < 100 || tm->tm_year >= 200)
return -EINVAL;
data[RTC_SEC] = bin2bcd(tm->tm_sec);
data[RTC_MIN] = bin2bcd(tm->tm_min);
data[RTC_HOUR] = bin2bcd(tm->tm_hour);
data[RTC_WDAY] = BIT(tm->tm_wday);
data[RTC_MDAY] = bin2bcd(tm->tm_mday);
data[RTC_MONTH] = bin2bcd(tm->tm_mon + 1);
data[RTC_YEAR] = bin2bcd(tm->tm_year % 100);
return 0;
}
/**
* rx6110_data_to_rtc_tm - convert native time encoding to rtc_time
*
* @data: holds the encoding in rx6110 native form
* @tm: holds date and time
*/
static int rx6110_data_to_rtc_tm(u8 *data, struct rtc_time *tm)
{
tm->tm_sec = bcd2bin(data[RTC_SEC] & 0x7f);
tm->tm_min = bcd2bin(data[RTC_MIN] & 0x7f);
/* only 24-hour clock */
tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
tm->tm_wday = ffs(data[RTC_WDAY] & 0x7f);
tm->tm_mday = bcd2bin(data[RTC_MDAY] & 0x3f);
tm->tm_mon = bcd2bin(data[RTC_MONTH] & 0x1f) - 1;
tm->tm_year = bcd2bin(data[RTC_YEAR]) + 100;
pr_debug("%s: date %ds %dm %dh %dmd %dm %dy\n", __func__,
tm->tm_sec, tm->tm_min, tm->tm_hour,
tm->tm_mday, tm->tm_mon, tm->tm_year);
/*
* The year in the RTC is a value between 0 and 99.
* Assume that this represents the current century
* and disregard all other values.
*/
if (tm->tm_year < 100 || tm->tm_year >= 200)
return -EINVAL;
return 0;
}
/**
* rx6110_set_time - set the current time in the rx6110 registers
*
* @dev: the rtc device in use
* @tm: holds date and time
*
* BUG: The HW assumes every year that is a multiple of 4 to be a leap
* year. Next time this is wrong is 2100, which will not be a leap year
*
* Note: If STOP is not set/cleared, the clock will start when the seconds
* register is written
*
*/
static int rx6110_set_time(struct device *dev, struct rtc_time *tm)
{
struct rx6110_data *rx6110 = dev_get_drvdata(dev);
u8 data[RTC_NR_TIME];
int ret;
ret = rx6110_rtc_tm_to_data(tm, data);
if (ret < 0)
return ret;
pr_debug("rx6110 set time: %u:%u:%u, %u/%u/%u\n", data[2], data[1],
data[0], data[4], data[5], data[6]);
/* set STOP bit before changing clock/calendar */
ret = regmap_update_bits(rx6110->regmap, RX6110_REG_CTRL,
RX6110_BIT_CTRL_STOP, RX6110_BIT_CTRL_STOP);
if (ret)
return ret;
ret = regmap_bulk_write(rx6110->regmap, RX6110_REG_SEC, data,
RTC_NR_TIME);
if (ret)
return ret;
/* The time in the RTC is valid. Be sure to have VLF cleared. */
ret = regmap_update_bits(rx6110->regmap, RX6110_REG_FLAG,
RX6110_BIT_FLAG_VLF, 0);
if (ret)
return ret;
/* clear STOP bit after changing clock/calendar */
ret = regmap_update_bits(rx6110->regmap, RX6110_REG_CTRL,
RX6110_BIT_CTRL_STOP, 0);
return ret;
}
/**
* rx6110_get_time - get the current time from the rx6110 registers
* @dev: the rtc device in use
* @tm: holds date and time
*/
static int rx6110_get_time(struct device *dev, struct rtc_time *tm)
{
struct rx6110_data *rx6110 = dev_get_drvdata(dev);
u8 data[RTC_NR_TIME];
int flags;
int ret;
ret = regmap_read(rx6110->regmap, RX6110_REG_FLAG, &flags);
if (ret)
return -EINVAL;
/* check for VLF Flag (set at power-on) */
if ((flags & RX6110_BIT_FLAG_VLF)) {
dev_warn(dev, "Voltage low, data is invalid.\n");
return -EINVAL;
}
/* read registers to date */
ret = regmap_bulk_read(rx6110->regmap, RX6110_REG_SEC, data,
RTC_NR_TIME);
if (ret)
return ret;
pr_debug("rx6110 get time: %u:%u:%u, %u/%u/%u\n", data[2], data[1],
data[0], data[4], data[5], data[6]);
ret = rx6110_data_to_rtc_tm(data, tm);
if (ret)
return ret;
dev_dbg(dev, "%s: date %ds %dm %dh %dmd %dm %dy\n", __func__,
tm->tm_sec, tm->tm_min, tm->tm_hour,
tm->tm_mday, tm->tm_mon, tm->tm_year);
return rtc_valid_tm(tm);
}
/**struct regmap_range - A register range, used for access related checks
*@RX6110_REG_SEC: address of first register
*@RX6110_REG_IRQ: address of last register
*/
static const struct regmap_range regmap_range_cfg[] = {
regmap_reg_range(RX6110_REG_SEC, RX6110_REG_IRQ),
};
static const struct regmap_access_table regmap_readble_table = {
.yes_ranges = regmap_range_cfg,
.n_yes_ranges = ARRAY_SIZE(regmap_range_cfg),
};
/* Alarm */
/* Clear alarm status bit. */
static int rx6110_rtc_clear_alarm(struct device *dev)
{
struct rx6110_data *data = dev_get_drvdata(dev);
int ret;
ret = regmap_update_bits(data->regmap, RX6110_REG_FLAG,
RX6110_BIT_FLAG_AF, 0);
if (ret)
dev_err(dev, "%s: clearing alarm failed (%d)\n",
__func__, ret);
return ret;
}
/* Enable or disable alarm (i.e. alarm interrupt generation) */
static int rx6110_rtc_update_alarm(struct device *dev, int enable)
{
struct rx6110_data *data = dev_get_drvdata(dev);
int ret;
ret = regmap_update_bits(data->regmap, RX6110_REG_CTRL,
0x08, enable ? 8 : 0);
if (ret)
dev_err(dev, "%s: writing alarm INT failed (%d)\n",
__func__, ret);
return ret;
}
/*Creating sysfs nodes to set and read the values of
* RX6110_BIT_EXT_WADA bit and RX6110_REG_ALWDAY (0x1A)
* @WADA : this node is used to select either week alarm or day alarm
* @WeekDay_alarm: this node is used to set the alarm value
*/
static const char alarm_week_str[] =
"Value represented as bitmask to visualize weekday,\r\n|Sun\t|Mon\t|Tue\t|Wed\t|Thr\t|Fri\t|Sat\r\n|%d\t|%d\t|%d\t|%d\t|%d\t|%d\t|%d\r\nHour:%d, Minute: %d\n";
#define WADA_SUN(x) (x&0x01)
#define WADA_MON(x) ((x & 0x02) >> 1)
#define WADA_TUE(x) ((x & 0x04) >> 2)
#define WADA_WED(x) ((x & 0x08) >> 3)
#define WADA_THR(x) ((x & 0x10) >> 4)
#define WADA_FRI(x) ((x & 0x20) >> 5)
#define WADA_SAT(x) ((x & 0x40) >> 6)
#define ALARM_WEEKDAYS(x) WADA_SUN(x), WADA_MON(x), WADA_TUE(x), \
WADA_WED(x),\
WADA_THR(x), WADA_FRI(x), WADA_SAT(x)
static ssize_t rx6110_WADA_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
unsigned int bits;
struct rx6110_data *rx6110;
rx6110 = dev_get_drvdata(dev->parent);
ret = regmap_read(rx6110->regmap, RX6110_REG_EXT, &bits);
if (ret)
return ret;
if ((bits & RX6110_BIT_EXT_WADA) == 0)
ret = snprintf(buf, sizeof("0: Weekly alarms configured\n"),
"0: Weekly alarms configured\n");
else
ret = snprintf(buf, sizeof("1: Daily alarms configured\n"),
"1: Daily alarms configured\n");
return ret;
}
static ssize_t rx6110_WADA_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t n)
{
unsigned int bits;
int ret;
struct rx6110_data *rx6110 = dev_get_drvdata(dev->parent);
if (n < 1)
return 0;
ret = kstrtouint(buf, 0, &bits);
if (ret < 1)
return ret;
if (bits == 1)
bits = RX6110_BIT_EXT_WADA;
ret = regmap_update_bits(rx6110->regmap, RX6110_REG_EXT,
RX6110_BIT_EXT_WADA, bits);
return n;
}
static ssize_t rx6110_AlarmData_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct rx6110_data *rx6110;
int ret;
unsigned int bits;
struct rtc_time time;
rx6110 = dev_get_drvdata(dev->parent);
ret = regmap_read(rx6110->regmap, RX6110_REG_ALMIN, &bits);
if (ret)
return ret;
if ((bits & 0x80) == 0)
time.tm_min = bits & 0x7f;
else
time.tm_min = 0;
ret = regmap_read(rx6110->regmap, RX6110_REG_ALHOUR, &bits);
if (ret)
return ret;
if ((bits & 0x80) == 0)
time.tm_hour = bits & 0x3f;
else
time.tm_hour = 0;
ret = regmap_read(rx6110->regmap, RX6110_REG_ALWDAY, &bits);
if (ret)
return ret;
if ((bits & 0x80) == 0)
time.tm_mday = bits & 0x7f;
else
time.tm_mday = 0;
ret = regmap_read(rx6110->regmap, RX6110_REG_EXT, &bits);
if (ret)
return ret;
if ((bits & RX6110_BIT_EXT_WADA) == 0) {
/*WADA bit is set, so day is selected */
ret = snprintf(buf, sizeof(alarm_week_str), alarm_week_str,
ALARM_WEEKDAYS(time.tm_mday), time.tm_hour,
time.tm_min);
} else {
ret = snprintf(buf, sizeof("day:%d, Hour:%d, Minute: %d\n"),
"day:%d, Hour:%d, Minute: %d\n",
time.tm_mday, time.tm_hour, time.tm_min);
}
return ret;
}
static ssize_t rx6110_AlarmData_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t n)
{
struct rx6110_data *rx6110;
int ret;
unsigned int bits, int_data[3];
u8 data[RX6110_ALARM_LEN];
rx6110 = dev_get_drvdata(dev->parent);
if (n < 1)
return 0;
ret = sscanf(buf, "%u-%u:%u", &int_data[2], &int_data[1], &int_data[0]);
if (ret < 3)
return ret;
/*Read WADA bit to check the mask for WDAY register*/
ret = regmap_read(rx6110->regmap, RX6110_REG_EXT, &bits);
if (ret)
return ret;
/*Convert to BCD format*/
data[2] = bin2bcd(int_data[2] & 0x7f);
data[1] = bin2bcd(int_data[1] & 0x7f);
data[0] = bin2bcd(int_data[0] & 0x7f);
if (bits & RX6110_BIT_EXT_WADA)
data[2] &= 0x3f;
else
data[2] &= 0x7f;
/*If all values are 0, disable the alarm*/
if ((data[0] && data[1] && data[2]) == 0) {
bits = 0;
data[0] |= 0x80;
data[1] |= 0x80;
data[2] |= 0x80;
} else
bits = RX6110_BIT_CTRL_AIE;
/*Write to minute, hour and wday registers*/
ret = regmap_bulk_write(rx6110->regmap, RX6110_REG_ALMIN, data,
RX6110_ALARM_LEN);
if (ret)
return ret;
/*Write to control register with alarm interrupt status*/
ret = regmap_update_bits(rx6110->regmap, RX6110_REG_CTRL,
RX6110_BIT_CTRL_AIE, bits);
if (ret)
return ret;
return n;
}
static DEVICE_ATTR(wada, RW_MODE, rx6110_WADA_show, rx6110_WADA_store);
static DEVICE_ATTR(weekday_alarm, RW_MODE, rx6110_AlarmData_show,
rx6110_AlarmData_store);
static const struct attribute *rx6110_attr[] = {
&dev_attr_wada.attr,
&dev_attr_weekday_alarm.attr,
NULL,
};
/*__rx6110_rtc_set_alarm: compares the alarm time with the rtc time*/
static int __rx6110_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm,
int *enable)
{
struct rtc_time *alarm_tm = &alarm->time;
struct rtc_time rtc_tm;
unsigned long rtc_secs, alarm_secs;
int ret;
ret = rx6110_get_time(dev, &rtc_tm);
if (ret)
return ret;
ret = rtc_tm_to_time(&rtc_tm, &rtc_secs);
if (ret)
return ret;
ret = rtc_tm_to_time(alarm_tm, &alarm_secs);
if (ret)
return ret;
/* If alarm time is before current time, disable the alarm */
if (!alarm->enabled || alarm_secs <= rtc_secs) {
*enable = 0;
} else {
/*
* Chip only support alarms up to one month in the future.
* Return an error if value is over one month.
* Comparison is done by incrementing rtc_tm month field by one
* and checking alarm value is still below.
*/
if (rtc_tm.tm_mon == 11) { /*handle year wrapping*/
rtc_tm.tm_mon = 0;
rtc_tm.tm_year += 1;
} else {
rtc_tm.tm_mon += 1;
}
ret = rtc_tm_to_time(&rtc_tm, &rtc_secs);
if (ret)
return ret;
if (alarm_secs > rtc_secs) {
dev_err(dev, "%s: max for alarm is one month (%d)\n",
__func__, ret);
return -EINVAL;
}
}
return 0;
}
static int rx6110_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct rx6110_data *data = dev_get_drvdata(dev);
struct rtc_time *alarm_tm = &alarm->time;
u8 regs[RX6110_ALARM_LEN];
int ret, enable = 0;
if (alarm->enabled)
enable = 1;
mutex_lock(&data->lock);
/*Check if alarm is valid*/
ret = __rx6110_rtc_set_alarm(dev, alarm, &enable);
if (ret)
goto err_unlock;
/* Disable the alarm (AIE = 0) before modifying it */
ret = rx6110_rtc_update_alarm(dev, 0);
if (ret < 0) {
dev_err(dev, "%s: unable to disable the alarm (%d)\n",
__func__, ret);
goto err_unlock;
}
/* Program alarm registers */
regs[0] = bin2bcd(alarm_tm->tm_min) & 0x7f;
regs[1] = bin2bcd(alarm_tm->tm_hour) & 0x3f;
regs[2] = bin2bcd(alarm_tm->tm_wday) & 0x3f;
ret = regmap_bulk_write(data->regmap, RX6110_REG_ALMIN, regs,
RX6110_ALARM_LEN);
if (ret < 0) {
dev_err(dev, "%s: writing alarm section failed (%d)\n",
__func__, ret);
goto err_unlock;
}
/*Set WADA bit high to enable day comparison*/
ret = regmap_update_bits(data->regmap, RX6110_REG_EXT,
RX6110_BIT_EXT_WADA, RX6110_BIT_EXT_WADA);
if (ret) {
dev_err(dev, "%s: writing WADA bit failed (%d)\n",
__func__, ret);
goto err_unlock;
}
/*clear alarm flag AF*/
ret = rx6110_rtc_clear_alarm(dev);
if (ret) {
dev_err(dev, "%s: Cannot clear AF (%d)\n",
__func__, ret);
goto err_unlock;
}
/* Enable alarm (AIE=1) */
ret = rx6110_rtc_update_alarm(dev, enable);
if (ret) {
dev_err(dev, "%s: Failed to enable alarm interrupt (%d)\n",
__func__, ret);
goto err_unlock;
}
err_unlock:
mutex_unlock(&data->lock);
return ret;
}
/**__rx6110_rtc_read_alarm: reads the alarm registers and
* adjust the month and year if necessary
*/
static int __rx6110_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct rx6110_data *data = dev_get_drvdata(dev);
struct rtc_time rtc_tm, *alarm_tm = &alarm->time;
unsigned long rtc_secs, alarm_secs;
u8 regs[RX6110_ALARM_LEN];
unsigned int ext;
int ret;
ret = regmap_bulk_read(data->regmap, RX6110_REG_ALMIN,
regs, RX6110_ALARM_LEN);
if (ret) {
dev_err(dev, "%s: reading alarm section failed (%d)\n",
__func__, ret);
return ret;
}
alarm_tm->tm_min = bcd2bin(regs[0] & 0x7f);
alarm_tm->tm_hour = bcd2bin(regs[1] & 0x3f);
alarm_tm->tm_wday = bcd2bin(regs[2] & 0x7f);
/*
* The alarm section does not store year/month. Use the data in rtc
* as basis and increment month and then year if needed to get
* alarm after current time.
*/
ret = rx6110_get_time(dev, &rtc_tm);
if (ret)
return ret;
alarm_tm->tm_year = rtc_tm.tm_year;
alarm_tm->tm_mon = rtc_tm.tm_mon;
ret = rtc_tm_to_time(&rtc_tm, &rtc_secs);
if (ret)
return ret;
ret = rtc_tm_to_time(alarm_tm, &alarm_secs);
if (ret)
return ret;
/*
* If WADA bit is set, alarm triggers on the configured day
* else on the days selected in wday field
*/
ret = regmap_read(data->regmap, RX6110_REG_EXT, &ext);
if (ret)
return ret;
/*If alarm bits are not enabled, then next alarm is empty*/
if (!((regs[0] & RX6110_BIT_ALARM_EN) &&
(regs[1] & RX6110_BIT_ALARM_EN) &&
(regs[2] & RX6110_BIT_ALARM_EN))) {
alarm->enabled = 0;
/*If WADA is set then consider monthly alarm*/
} else if (ext & RX6110_BIT_EXT_WADA) {
if (alarm_secs < rtc_secs) {
if (alarm_tm->tm_mon == 11) {
alarm_tm->tm_mon = 0;
alarm_tm->tm_year += 1;
} else {
alarm_tm->tm_mon += 1;
}
}
} else if ((ext & RX6110_BIT_EXT_WADA) == 0) {
/*Handle week day alarm*/
if (alarm_secs < rtc_secs) {
if ((alarm_tm->tm_mday + 7) >=
(rtc_month_days(alarm_tm->tm_mon, alarm_tm->tm_year +
1900))) {
alarm_tm->tm_mday = (alarm_tm->tm_mday + 7) %
(rtc_month_days(alarm_tm->tm_mon,
alarm_tm->tm_year + 1900));
if (alarm_tm->tm_mon == 11) {
alarm_tm->tm_mon = 0;
alarm_tm->tm_year += 1;
} else {
alarm_tm->tm_mon += 1;
}
} else {
alarm_tm->tm_mday += 7;
}
}
}
return 0;
}
static int rx6110_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct rx6110_data *data = dev_get_drvdata(dev);
unsigned int ir;
int ret;
mutex_lock(&data->lock);
ret = __rx6110_rtc_read_alarm(dev, alarm);
if (ret)
goto err_unlock;
/* enable alarm if AIE bit is '1' */
ret = regmap_read(data->regmap, RX6110_REG_CTRL, &ir);
if (ret) {
dev_err(dev, "%s: reading alarm interrupt flag failed (%d)\n",
__func__, ret);
goto err_unlock;
}
alarm->enabled = !!(ir & RX6110_BIT_CTRL_AIE);
alarm->pending = 0;
err_unlock:
mutex_unlock(&data->lock);
return ret;
}
static void rx6110_sysfs_init(struct device *dev)
{
int ret = 0;
if ((!dev) || !(&dev->kobj)) {
pr_err("unable to create rx6110 kernel object!\n");
return;
}
/* create sysfs */
ret = sysfs_create_files(&dev->kobj, rx6110_attr);
if (ret)
pr_err("failed to create wada and weekday_alarm files\n");
}
static void rx6110_sysfs_exit(struct device *dev)
{
if ((!dev) || !(&dev->kobj))
return;
sysfs_remove_files(&dev->kobj, rx6110_attr);
}
static const struct reg_sequence rx6110_default_regs1[] = {
{ RX6110_REG_RES1, 0xB8},
{ RX6110_REG_RES2, 0x00},
{ RX6110_REG_RES3, 0x10},
{ RX6110_REG_IRQ, 0x00},
};
static const struct reg_sequence rx6110_default_regs2[] = {
{ RX6110_REG_ALMIN, 0x00},
{ RX6110_REG_ALHOUR, 0x00},
{ RX6110_REG_ALWDAY, 0x00},
};
/*Alarm IRQ handler*/
static irqreturn_t rx6110_alarm_irq(int irq, void *data)
{
struct rx6110_data *rx6110 = data;
int ret;
dev_dbg(&rx6110->rtc->dev, "RTC alarm IRQ: %d\n", irq);
rtc_update_irq(rx6110->rtc, 1, RTC_IRQF | RTC_AF);
/* clear alarm flag */
ret = regmap_update_bits(rx6110->regmap, RX6110_REG_FLAG,
RX6110_BIT_FLAG_AF, 0);
if (ret < 0)
return ret;
return IRQ_HANDLED;
}
/**
* rx6110_init - initialize the rx6110 registers
*
* @rx6110: pointer to the rx6110 struct in use
*
*/
static int rx6110_init(struct rx6110_data *rx6110)
{
struct rtc_device *rtc = rx6110->rtc;
int flags;
int ret;
ret = regmap_update_bits(rx6110->regmap, RX6110_REG_EXT,
RX6110_BIT_EXT_TE, 0);
if (ret)
return ret;
ret = regmap_register_patch(rx6110->regmap, rx6110_default_regs1,
ARRAY_SIZE(rx6110_default_regs1));
if (ret)
return ret;
/** Check for voltage low bit(VLF).
* 0 : set the register values to default values
* 1 : The Previous value of RTC registers are retained
*/
ret = regmap_read(rx6110->regmap, RX6110_REG_FLAG, &flags);
if (ret)
return ret;
if (flags & RX6110_BIT_FLAG_VLF) {
dev_warn(&rtc->dev, "Voltage low, data loss detected.\n");
ret = regmap_register_patch(rx6110->regmap,
rx6110_default_regs2, ARRAY_SIZE(rx6110_default_regs2));
if (ret)
return ret;
}
/* check for Alarm Flag */
if (flags & RX6110_BIT_FLAG_AF)
dev_warn(&rtc->dev, "An alarm may have been missed.\n");
/* clear all flags BUT VLF */
ret = regmap_update_bits(rx6110->regmap, RX6110_REG_FLAG,
RX6110_BIT_FLAG_AF |
RX6110_BIT_FLAG_UF |
RX6110_BIT_FLAG_TF |
RX6110_BIT_FLAG_VLF,
0);
if (ret < 0)
return ret;
rx6110->irqchip = &rx6110_irq_chip;
ret = regmap_add_irq_chip(rx6110->regmap, rx6110->irq,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
IRQF_SHARED, 0, rx6110->irqchip,
&rx6110->irq_data);
if (ret < 0) {
dev_err(&rx6110->rtc->dev, "Failed to add RTC irq chip: %d\n",
ret);
goto err_rtc;
}
/*Request virq for Alarm interrupt*/
rx6110->virq = regmap_irq_get_virq(rx6110->irq_data, 0);
if (rx6110->virq <= 0) {
ret = -ENXIO;
goto err_rtc;
}
dev_dbg(&rx6110->rtc->dev, "virq for rx6110 alarm irq: %d\n",
rx6110->virq);
ret = request_threaded_irq(rx6110->virq, NULL, rx6110_alarm_irq, 0,
"rx6110_rtc_alarm", rx6110);
if (ret < 0)
dev_err(&rx6110->rtc->dev, "Failed to request alarm IRQ: %d: %d\n",
rx6110->virq, ret);
err_rtc:
return 0;
}
static const struct rtc_class_ops rx6110_rtc_ops = {
.read_time = rx6110_get_time,
.set_time = rx6110_set_time,
.set_alarm = rx6110_rtc_set_alarm,
.read_alarm = rx6110_rtc_read_alarm,
};
static const struct regmap_config regmap_rx6110_config = {
.reg_bits = 8,
.reg_stride = 0,
.val_bits = 8,
.max_register = RX6110_REG_IRQ,
.read_flag_mask = 0x80,
.rd_table = &regmap_readble_table,
};
#if IS_ENABLED(CONFIG_SPI_MASTER)
/**
* rx6110_probe - initialize rtc driver
* @spi: pointer to spi device
*/
static int rx6110_spi_probe(struct spi_device *spi)
{
struct rx6110_data *rx6110;
int err;
if ((spi->bits_per_word && spi->bits_per_word != 8) ||
(spi->max_speed_hz > 2000000) ||
(spi->mode != (SPI_CS_HIGH | SPI_CPOL | SPI_CPHA))) {
dev_warn(&spi->dev, "SPI settings: bits_per_word: %d, max_speed_hz: %d, mode: %xh\n",
spi->bits_per_word, spi->max_speed_hz, spi->mode);
dev_warn(&spi->dev, "driving device in an unsupported mode");
}
rx6110 = devm_kzalloc(&spi->dev, sizeof(*rx6110), GFP_KERNEL);
if (!rx6110)
return -ENOMEM;
mutex_init(&rx6110->lock);
rx6110->regmap = devm_regmap_init_spi(spi, &regmap_rx6110_config);
if (IS_ERR(rx6110->regmap)) {
dev_err(&spi->dev, "regmap init failed for rtc rx6110\n");
return PTR_ERR(rx6110->regmap);
}
spi_set_drvdata(spi, rx6110);
device_set_wakeup_capable(&spi->dev, 1);
rx6110->rtc = devm_rtc_device_register(&spi->dev,
RX6110_DRIVER_NAME,
&rx6110_rtc_ops, THIS_MODULE);
if (IS_ERR(rx6110->rtc))
return PTR_ERR(rx6110->rtc);
/*Assign irq number from device*/
rx6110->irq = spi->irq;
err = rx6110_init(rx6110);
if (err)
return err;
/*max_user_freq:The maximum interrupt rate an unprivileged user may request
* from this RTC(1Hz).
*/
rx6110->rtc->max_user_freq = 1;
rx6110_sysfs_init(&rx6110->rtc->dev);
rx6110->rtc->uie_unsupported = 1;
return 0;
}
static int rx6110_spi_remove(struct spi_device *spi)
{
struct rx6110_data *rx6110 = spi_get_drvdata(spi);
if ((!rx6110) || (!rx6110->rtc))
return 0;
free_irq(rx6110->virq, rx6110);
rx6110_sysfs_exit(&rx6110->rtc->dev);
return 0;
}
static const struct spi_device_id rx6110_spi_id[] = {
{ "rx6110", 0},
{}
};
MODULE_DEVICE_TABLE(spi, rx6110_id);
static struct spi_driver rx6110_spi_driver = {
.driver = {
.name = RX6110_DRIVER_NAME,
},
.probe = rx6110_spi_probe,
.remove = rx6110_spi_remove,
.id_table = rx6110_spi_id,
};
module_spi_driver(rx6110_spi_driver);
#endif
#if IS_ENABLED(CONFIG_I2C)
/**
* rx6110_probe - initialize rtc driver
* @i2c: pointer to i2c device
*/
static int rx6110_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct rx6110_data *rx6110;
int err;
rx6110 = devm_kzalloc(&client->dev, sizeof(*rx6110), GFP_KERNEL);
if (!rx6110)
return -ENOMEM;
mutex_init(&rx6110->lock);
rx6110->regmap = devm_regmap_init_i2c(client, &regmap_rx6110_config);
if (IS_ERR(rx6110->regmap)) {
dev_err(&client->dev, "%s: regmap allocation failed: %ld\n",
__func__, PTR_ERR(rx6110->regmap));
return PTR_ERR(rx6110->regmap);
}
i2c_set_clientdata(client, rx6110);
device_set_wakeup_capable(&client->dev, 1);
rx6110->rtc = devm_rtc_device_register(&client->dev, RX6110_DRIVER_NAME,
&rx6110_rtc_ops, THIS_MODULE);
if (IS_ERR(rx6110->rtc))
return PTR_ERR(rx6110->rtc);
/*Assign irq number from device*/
rx6110->irq = client->irq;
err = rx6110_init(rx6110);
if (err)
return err;
/** max_user_freq:The maximum interrupt rate an unprivileged user may request
* from this RTC(1Hz).
*/
rx6110->rtc->max_user_freq = 1;
rx6110_sysfs_init(&rx6110->rtc->dev);
rx6110->rtc->uie_unsupported = 1;
return 0;
}
static int rx6110_i2c_remove(struct i2c_client *client)
{
struct rx6110_data *rx6110 =
(struct rx6110_data *)i2c_get_clientdata(client);
if ((!rx6110) || !(&rx6110->rtc->dev))
return 0;
rx6110_sysfs_exit(&rx6110->rtc->dev);
return 0;
}
static const struct i2c_device_id rx6110_i2c_id[] = {
{ "rx6110", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, rx6110_i2c_id);
static struct i2c_driver rx6110_i2c_driver = {
.driver = {
.name = RX6110_DRIVER_NAME,
},
.probe = rx6110_i2c_probe,
.remove = rx6110_i2c_remove,
.id_table = rx6110_i2c_id,
};
module_i2c_driver(rx6110_i2c_driver);
#endif
MODULE_AUTHOR("Val Krutov <val.krutov@erd.epson.com>,Poojashree <pms@nvidia.com>, Vishruth Jain <vishruthj@nvidia.com>");
MODULE_DESCRIPTION("RX-6110 SA RTC driver over SPI and I2C");
MODULE_LICENSE("GPL");