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linux/drivers/rtc/rtc-rv3029c2.c
Alexandre Belloni f630f728a9 rtc: rv3029: add RTC_VL_READ and RTC_VL_CLEAR support 
The RV3029 can report three different conditions: power on, voltage dropped
and data is lost and voltage is low and temperature compensation has
stopped. The first two conditions amount to the same status, the RTC data
is invalid.

VLOW1 has to be cleared manually to resume temperature compensation, this
is achieved using RTC_VL_CLEAR.

Link: https://lore.kernel.org/r/20191214221022.622482-11-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-12-18 10:38:02 +01:00

921 lines
23 KiB
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Micro Crystal RV-3029 / RV-3049 rtc class driver
*
* Author: Gregory Hermant <gregory.hermant@calao-systems.com>
* Michael Buesch <m@bues.ch>
*
* based on previously existing rtc class drivers
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/spi/spi.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/regmap.h>
/* Register map */
/* control section */
#define RV3029_ONOFF_CTRL 0x00
#define RV3029_ONOFF_CTRL_WE BIT(0)
#define RV3029_ONOFF_CTRL_TE BIT(1)
#define RV3029_ONOFF_CTRL_TAR BIT(2)
#define RV3029_ONOFF_CTRL_EERE BIT(3)
#define RV3029_ONOFF_CTRL_SRON BIT(4)
#define RV3029_ONOFF_CTRL_TD0 BIT(5)
#define RV3029_ONOFF_CTRL_TD1 BIT(6)
#define RV3029_ONOFF_CTRL_CLKINT BIT(7)
#define RV3029_IRQ_CTRL 0x01
#define RV3029_IRQ_CTRL_AIE BIT(0)
#define RV3029_IRQ_CTRL_TIE BIT(1)
#define RV3029_IRQ_CTRL_V1IE BIT(2)
#define RV3029_IRQ_CTRL_V2IE BIT(3)
#define RV3029_IRQ_CTRL_SRIE BIT(4)
#define RV3029_IRQ_FLAGS 0x02
#define RV3029_IRQ_FLAGS_AF BIT(0)
#define RV3029_IRQ_FLAGS_TF BIT(1)
#define RV3029_IRQ_FLAGS_V1IF BIT(2)
#define RV3029_IRQ_FLAGS_V2IF BIT(3)
#define RV3029_IRQ_FLAGS_SRF BIT(4)
#define RV3029_STATUS 0x03
#define RV3029_STATUS_VLOW1 BIT(2)
#define RV3029_STATUS_VLOW2 BIT(3)
#define RV3029_STATUS_SR BIT(4)
#define RV3029_STATUS_PON BIT(5)
#define RV3029_STATUS_EEBUSY BIT(7)
#define RV3029_RST_CTRL 0x04
#define RV3029_RST_CTRL_SYSR BIT(4)
#define RV3029_CONTROL_SECTION_LEN 0x05
/* watch section */
#define RV3029_W_SEC 0x08
#define RV3029_W_MINUTES 0x09
#define RV3029_W_HOURS 0x0A
#define RV3029_REG_HR_12_24 BIT(6) /* 24h/12h mode */
#define RV3029_REG_HR_PM BIT(5) /* PM/AM bit in 12h mode */
#define RV3029_W_DATE 0x0B
#define RV3029_W_DAYS 0x0C
#define RV3029_W_MONTHS 0x0D
#define RV3029_W_YEARS 0x0E
#define RV3029_WATCH_SECTION_LEN 0x07
/* alarm section */
#define RV3029_A_SC 0x10
#define RV3029_A_MN 0x11
#define RV3029_A_HR 0x12
#define RV3029_A_DT 0x13
#define RV3029_A_DW 0x14
#define RV3029_A_MO 0x15
#define RV3029_A_YR 0x16
#define RV3029_A_AE_X BIT(7)
#define RV3029_ALARM_SECTION_LEN 0x07
/* timer section */
#define RV3029_TIMER_LOW 0x18
#define RV3029_TIMER_HIGH 0x19
/* temperature section */
#define RV3029_TEMP_PAGE 0x20
/* eeprom data section */
#define RV3029_E2P_EEDATA1 0x28
#define RV3029_E2P_EEDATA2 0x29
#define RV3029_E2PDATA_SECTION_LEN 0x02
/* eeprom control section */
#define RV3029_CONTROL_E2P_EECTRL 0x30
#define RV3029_EECTRL_THP BIT(0) /* temp scan interval */
#define RV3029_EECTRL_THE BIT(1) /* thermometer enable */
#define RV3029_EECTRL_FD0 BIT(2) /* CLKOUT */
#define RV3029_EECTRL_FD1 BIT(3) /* CLKOUT */
#define RV3029_TRICKLE_1K BIT(4) /* 1.5K resistance */
#define RV3029_TRICKLE_5K BIT(5) /* 5K resistance */
#define RV3029_TRICKLE_20K BIT(6) /* 20K resistance */
#define RV3029_TRICKLE_80K BIT(7) /* 80K resistance */
#define RV3029_TRICKLE_MASK (RV3029_TRICKLE_1K |\
RV3029_TRICKLE_5K |\
RV3029_TRICKLE_20K |\
RV3029_TRICKLE_80K)
#define RV3029_TRICKLE_SHIFT 4
#define RV3029_CONTROL_E2P_XOFFS 0x31 /* XTAL offset */
#define RV3029_CONTROL_E2P_XOFFS_SIGN BIT(7) /* Sign: 1->pos, 0->neg */
#define RV3029_CONTROL_E2P_QCOEF 0x32 /* XTAL temp drift coef */
#define RV3029_CONTROL_E2P_TURNOVER 0x33 /* XTAL turnover temp (in *C) */
#define RV3029_CONTROL_E2P_TOV_MASK 0x3F /* XTAL turnover temp mask */
/* user ram section */
#define RV3029_USR1_RAM_PAGE 0x38
#define RV3029_USR1_SECTION_LEN 0x04
#define RV3029_USR2_RAM_PAGE 0x3C
#define RV3029_USR2_SECTION_LEN 0x04
struct rv3029_data {
struct device *dev;
struct rtc_device *rtc;
struct regmap *regmap;
int irq;
};
static int rv3029_eeprom_busywait(struct rv3029_data *rv3029)
{
unsigned int sr;
int i, ret;
for (i = 100; i > 0; i--) {
ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
if (ret < 0)
break;
if (!(sr & RV3029_STATUS_EEBUSY))
break;
usleep_range(1000, 10000);
}
if (i <= 0) {
dev_err(rv3029->dev, "EEPROM busy wait timeout.\n");
return -ETIMEDOUT;
}
return ret;
}
static int rv3029_eeprom_exit(struct rv3029_data *rv3029)
{
/* Re-enable eeprom refresh */
return regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,
RV3029_ONOFF_CTRL_EERE,
RV3029_ONOFF_CTRL_EERE);
}
static int rv3029_eeprom_enter(struct rv3029_data *rv3029)
{
unsigned int sr;
int ret;
/* Check whether we are in the allowed voltage range. */
ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
if (ret < 0)
return ret;
if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) {
/* We clear the bits and retry once just in case
* we had a brown out in early startup.
*/
ret = regmap_update_bits(rv3029->regmap, RV3029_STATUS,
RV3029_STATUS_VLOW1 |
RV3029_STATUS_VLOW2, 0);
if (ret < 0)
return ret;
usleep_range(1000, 10000);
ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
if (ret < 0)
return ret;
if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) {
dev_err(rv3029->dev,
"Supply voltage is too low to safely access the EEPROM.\n");
return -ENODEV;
}
}
/* Disable eeprom refresh. */
ret = regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,
RV3029_ONOFF_CTRL_EERE, 0);
if (ret < 0)
return ret;
/* Wait for any previous eeprom accesses to finish. */
ret = rv3029_eeprom_busywait(rv3029);
if (ret < 0)
rv3029_eeprom_exit(rv3029);
return ret;
}
static int rv3029_eeprom_read(struct rv3029_data *rv3029, u8 reg,
u8 buf[], size_t len)
{
int ret, err;
err = rv3029_eeprom_enter(rv3029);
if (err < 0)
return err;
ret = regmap_bulk_read(rv3029->regmap, reg, buf, len);
err = rv3029_eeprom_exit(rv3029);
if (err < 0)
return err;
return ret;
}
static int rv3029_eeprom_write(struct rv3029_data *rv3029, u8 reg,
u8 const buf[], size_t len)
{
unsigned int tmp;
int ret, err;
size_t i;
err = rv3029_eeprom_enter(rv3029);
if (err < 0)
return err;
for (i = 0; i < len; i++, reg++) {
ret = regmap_read(rv3029->regmap, reg, &tmp);
if (ret < 0)
break;
if (tmp != buf[i]) {
tmp = buf[i];
ret = regmap_write(rv3029->regmap, reg, tmp);
if (ret < 0)
break;
}
ret = rv3029_eeprom_busywait(rv3029);
if (ret < 0)
break;
}
err = rv3029_eeprom_exit(rv3029);
if (err < 0)
return err;
return ret;
}
static int rv3029_eeprom_update_bits(struct rv3029_data *rv3029,
u8 reg, u8 mask, u8 set)
{
u8 buf;
int ret;
ret = rv3029_eeprom_read(rv3029, reg, &buf, 1);
if (ret < 0)
return ret;
buf &= ~mask;
buf |= set & mask;
ret = rv3029_eeprom_write(rv3029, reg, &buf, 1);
if (ret < 0)
return ret;
return 0;
}
static irqreturn_t rv3029_handle_irq(int irq, void *dev_id)
{
struct device *dev = dev_id;
struct rv3029_data *rv3029 = dev_get_drvdata(dev);
struct mutex *lock = &rv3029->rtc->ops_lock;
unsigned int flags, controls;
unsigned long events = 0;
int ret;
mutex_lock(lock);
ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);
if (ret) {
dev_warn(dev, "Read IRQ Control Register error %d\n", ret);
mutex_unlock(lock);
return IRQ_NONE;
}
ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);
if (ret) {
dev_warn(dev, "Read IRQ Flags Register error %d\n", ret);
mutex_unlock(lock);
return IRQ_NONE;
}
if (flags & RV3029_IRQ_FLAGS_AF) {
flags &= ~RV3029_IRQ_FLAGS_AF;
controls &= ~RV3029_IRQ_CTRL_AIE;
events |= RTC_AF;
}
if (events) {
rtc_update_irq(rv3029->rtc, 1, events);
regmap_write(rv3029->regmap, RV3029_IRQ_FLAGS, flags);
regmap_write(rv3029->regmap, RV3029_IRQ_CTRL, controls);
}
mutex_unlock(lock);
return IRQ_HANDLED;
}
static int rv3029_read_time(struct device *dev, struct rtc_time *tm)
{
struct rv3029_data *rv3029 = dev_get_drvdata(dev);
int ret;
u8 regs[RV3029_WATCH_SECTION_LEN] = { 0, };
ret = regmap_bulk_read(rv3029->regmap, RV3029_W_SEC, regs,
RV3029_WATCH_SECTION_LEN);
if (ret < 0) {
dev_err(dev, "%s: reading RTC section failed\n", __func__);
return ret;
}
tm->tm_sec = bcd2bin(regs[RV3029_W_SEC - RV3029_W_SEC]);
tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES - RV3029_W_SEC]);
/* HR field has a more complex interpretation */
{
const u8 _hr = regs[RV3029_W_HOURS - RV3029_W_SEC];
if (_hr & RV3029_REG_HR_12_24) {
/* 12h format */
tm->tm_hour = bcd2bin(_hr & 0x1f);
if (_hr & RV3029_REG_HR_PM) /* PM flag set */
tm->tm_hour += 12;
} else /* 24h format */
tm->tm_hour = bcd2bin(_hr & 0x3f);
}
tm->tm_mday = bcd2bin(regs[RV3029_W_DATE - RV3029_W_SEC]);
tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS - RV3029_W_SEC]) - 1;
tm->tm_year = bcd2bin(regs[RV3029_W_YEARS - RV3029_W_SEC]) + 100;
tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS - RV3029_W_SEC]) - 1;
return 0;
}
static int rv3029_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct rv3029_data *rv3029 = dev_get_drvdata(dev);
struct rtc_time *const tm = &alarm->time;
unsigned int controls, flags;
int ret;
u8 regs[8];
ret = regmap_bulk_read(rv3029->regmap, RV3029_A_SC, regs,
RV3029_ALARM_SECTION_LEN);
if (ret < 0) {
dev_err(dev, "%s: reading alarm section failed\n", __func__);
return ret;
}
ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);
if (ret) {
dev_err(dev, "Read IRQ Control Register error %d\n", ret);
return ret;
}
ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);
if (ret < 0) {
dev_err(dev, "Read IRQ Flags Register error %d\n", ret);
return ret;
}
tm->tm_sec = bcd2bin(regs[RV3029_A_SC - RV3029_A_SC] & 0x7f);
tm->tm_min = bcd2bin(regs[RV3029_A_MN - RV3029_A_SC] & 0x7f);
tm->tm_hour = bcd2bin(regs[RV3029_A_HR - RV3029_A_SC] & 0x3f);
tm->tm_mday = bcd2bin(regs[RV3029_A_DT - RV3029_A_SC] & 0x3f);
tm->tm_mon = bcd2bin(regs[RV3029_A_MO - RV3029_A_SC] & 0x1f) - 1;
tm->tm_year = bcd2bin(regs[RV3029_A_YR - RV3029_A_SC] & 0x7f) + 100;
tm->tm_wday = bcd2bin(regs[RV3029_A_DW - RV3029_A_SC] & 0x07) - 1;
alarm->enabled = !!(controls & RV3029_IRQ_CTRL_AIE);
alarm->pending = (flags & RV3029_IRQ_FLAGS_AF) && alarm->enabled;
return 0;
}
static int rv3029_alarm_irq_enable(struct device *dev, unsigned int enable)
{
struct rv3029_data *rv3029 = dev_get_drvdata(dev);
return regmap_update_bits(rv3029->regmap, RV3029_IRQ_CTRL,
RV3029_IRQ_CTRL_AIE,
enable ? RV3029_IRQ_CTRL_AIE : 0);
}
static int rv3029_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct rv3029_data *rv3029 = dev_get_drvdata(dev);
struct rtc_time *const tm = &alarm->time;
int ret;
u8 regs[8];
/*
* The clock has an 8 bit wide bcd-coded register (they never learn)
* for the year. tm_year is an offset from 1900 and we are interested
* in the 2000-2099 range, so any value less than 100 is invalid.
*/
if (tm->tm_year < 100)
return -EINVAL;
/* Activate all the alarms with AE_x bit */
regs[RV3029_A_SC - RV3029_A_SC] = bin2bcd(tm->tm_sec) | RV3029_A_AE_X;
regs[RV3029_A_MN - RV3029_A_SC] = bin2bcd(tm->tm_min) | RV3029_A_AE_X;
regs[RV3029_A_HR - RV3029_A_SC] = (bin2bcd(tm->tm_hour) & 0x3f)
| RV3029_A_AE_X;
regs[RV3029_A_DT - RV3029_A_SC] = (bin2bcd(tm->tm_mday) & 0x3f)
| RV3029_A_AE_X;
regs[RV3029_A_MO - RV3029_A_SC] = (bin2bcd(tm->tm_mon + 1) & 0x1f)
| RV3029_A_AE_X;
regs[RV3029_A_DW - RV3029_A_SC] = (bin2bcd(tm->tm_wday + 1) & 0x7)
| RV3029_A_AE_X;
regs[RV3029_A_YR - RV3029_A_SC] = (bin2bcd(tm->tm_year - 100))
| RV3029_A_AE_X;
/* Write the alarm */
ret = regmap_bulk_write(rv3029->regmap, RV3029_A_SC, regs,
RV3029_ALARM_SECTION_LEN);
if (ret < 0)
return ret;
return rv3029_alarm_irq_enable(dev, alarm->enabled);
}
static int rv3029_set_time(struct device *dev, struct rtc_time *tm)
{
struct rv3029_data *rv3029 = dev_get_drvdata(dev);
u8 regs[8];
int ret;
/*
* The clock has an 8 bit wide bcd-coded register (they never learn)
* for the year. tm_year is an offset from 1900 and we are interested
* in the 2000-2099 range, so any value less than 100 is invalid.
*/
if (tm->tm_year < 100)
return -EINVAL;
regs[RV3029_W_SEC - RV3029_W_SEC] = bin2bcd(tm->tm_sec);
regs[RV3029_W_MINUTES - RV3029_W_SEC] = bin2bcd(tm->tm_min);
regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour);
regs[RV3029_W_DATE - RV3029_W_SEC] = bin2bcd(tm->tm_mday);
regs[RV3029_W_MONTHS - RV3029_W_SEC] = bin2bcd(tm->tm_mon + 1);
regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd(tm->tm_wday + 1) & 0x7;
regs[RV3029_W_YEARS - RV3029_W_SEC] = bin2bcd(tm->tm_year - 100);
ret = regmap_bulk_write(rv3029->regmap, RV3029_W_SEC, regs,
RV3029_WATCH_SECTION_LEN);
if (ret < 0)
return ret;
/* clear PON bit */
return regmap_update_bits(rv3029->regmap, RV3029_STATUS,
RV3029_STATUS_PON, 0);
}
static int rv3029_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
struct rv3029_data *rv3029 = dev_get_drvdata(dev);
unsigned long vl = 0;
int sr, ret = 0;
switch (cmd) {
case RTC_VL_READ:
ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
if (ret < 0)
return ret;
if (sr & RV3029_STATUS_VLOW1)
vl = RTC_VL_ACCURACY_LOW;
if (sr & (RV3029_STATUS_VLOW2 | RV3029_STATUS_PON))
vl |= RTC_VL_DATA_INVALID;
return put_user(vl, (unsigned int __user *)arg);
case RTC_VL_CLR:
return regmap_update_bits(rv3029->regmap, RV3029_STATUS,
RV3029_STATUS_VLOW1, 0);
default:
return -ENOIOCTLCMD;
}
}
static const struct rv3029_trickle_tab_elem {
u32 r; /* resistance in ohms */
u8 conf; /* trickle config bits */
} rv3029_trickle_tab[] = {
{
.r = 1076,
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
}, {
.r = 1091,
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
RV3029_TRICKLE_20K,
}, {
.r = 1137,
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
RV3029_TRICKLE_80K,
}, {
.r = 1154,
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K,
}, {
.r = 1371,
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K |
RV3029_TRICKLE_80K,
}, {
.r = 1395,
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K,
}, {
.r = 1472,
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_80K,
}, {
.r = 1500,
.conf = RV3029_TRICKLE_1K,
}, {
.r = 3810,
.conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K |
RV3029_TRICKLE_80K,
}, {
.r = 4000,
.conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K,
}, {
.r = 4706,
.conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_80K,
}, {
.r = 5000,
.conf = RV3029_TRICKLE_5K,
}, {
.r = 16000,
.conf = RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
}, {
.r = 20000,
.conf = RV3029_TRICKLE_20K,
}, {
.r = 80000,
.conf = RV3029_TRICKLE_80K,
},
};
static void rv3029_trickle_config(struct device *dev)
{
struct rv3029_data *rv3029 = dev_get_drvdata(dev);
struct device_node *of_node = dev->of_node;
const struct rv3029_trickle_tab_elem *elem;
int i, err;
u32 ohms;
u8 trickle_set_bits;
if (!of_node)
return;
/* Configure the trickle charger. */
err = of_property_read_u32(of_node, "trickle-resistor-ohms", &ohms);
if (err) {
/* Disable trickle charger. */
trickle_set_bits = 0;
} else {
/* Enable trickle charger. */
for (i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++) {
elem = &rv3029_trickle_tab[i];
if (elem->r >= ohms)
break;
}
trickle_set_bits = elem->conf;
dev_info(dev,
"Trickle charger enabled at %d ohms resistance.\n",
elem->r);
}
err = rv3029_eeprom_update_bits(rv3029, RV3029_CONTROL_E2P_EECTRL,
RV3029_TRICKLE_MASK,
trickle_set_bits);
if (err < 0)
dev_err(dev, "Failed to update trickle charger config\n");
}
#ifdef CONFIG_RTC_DRV_RV3029_HWMON
static int rv3029_read_temp(struct rv3029_data *rv3029, int *temp_mC)
{
unsigned int temp;
int ret;
ret = regmap_read(rv3029->regmap, RV3029_TEMP_PAGE, &temp);
if (ret < 0)
return ret;
*temp_mC = ((int)temp - 60) * 1000;
return 0;
}
static ssize_t rv3029_hwmon_show_temp(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct rv3029_data *rv3029 = dev_get_drvdata(dev);
int ret, temp_mC;
ret = rv3029_read_temp(rv3029, &temp_mC);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", temp_mC);
}
static ssize_t rv3029_hwmon_set_update_interval(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
struct rv3029_data *rv3029 = dev_get_drvdata(dev);
unsigned int th_set_bits = 0;
unsigned long interval_ms;
int ret;
ret = kstrtoul(buf, 10, &interval_ms);
if (ret < 0)
return ret;
if (interval_ms != 0) {
th_set_bits |= RV3029_EECTRL_THE;
if (interval_ms >= 16000)
th_set_bits |= RV3029_EECTRL_THP;
}
ret = rv3029_eeprom_update_bits(rv3029, RV3029_CONTROL_E2P_EECTRL,
RV3029_EECTRL_THE | RV3029_EECTRL_THP,
th_set_bits);
if (ret < 0)
return ret;
return count;
}
static ssize_t rv3029_hwmon_show_update_interval(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct rv3029_data *rv3029 = dev_get_drvdata(dev);
int ret, interval_ms;
u8 eectrl;
ret = rv3029_eeprom_read(rv3029, RV3029_CONTROL_E2P_EECTRL,
&eectrl, 1);
if (ret < 0)
return ret;
if (eectrl & RV3029_EECTRL_THE) {
if (eectrl & RV3029_EECTRL_THP)
interval_ms = 16000;
else
interval_ms = 1000;
} else {
interval_ms = 0;
}
return sprintf(buf, "%d\n", interval_ms);
}
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, rv3029_hwmon_show_temp,
NULL, 0);
static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,
rv3029_hwmon_show_update_interval,
rv3029_hwmon_set_update_interval, 0);
static struct attribute *rv3029_hwmon_attrs[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_update_interval.dev_attr.attr,
NULL,
};
ATTRIBUTE_GROUPS(rv3029_hwmon);
static void rv3029_hwmon_register(struct device *dev, const char *name)
{
struct rv3029_data *rv3029 = dev_get_drvdata(dev);
struct device *hwmon_dev;
hwmon_dev = devm_hwmon_device_register_with_groups(dev, name, rv3029,
rv3029_hwmon_groups);
if (IS_ERR(hwmon_dev)) {
dev_warn(dev, "unable to register hwmon device %ld\n",
PTR_ERR(hwmon_dev));
}
}
#else /* CONFIG_RTC_DRV_RV3029_HWMON */
static void rv3029_hwmon_register(struct device *dev, const char *name)
{
}
#endif /* CONFIG_RTC_DRV_RV3029_HWMON */
static struct rtc_class_ops rv3029_rtc_ops = {
.read_time = rv3029_read_time,
.set_time = rv3029_set_time,
.ioctl = rv3029_ioctl,
};
static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,
const char *name)
{
struct rv3029_data *rv3029;
int rc = 0;
rv3029 = devm_kzalloc(dev, sizeof(*rv3029), GFP_KERNEL);
if (!rv3029)
return -ENOMEM;
rv3029->regmap = regmap;
rv3029->irq = irq;
rv3029->dev = dev;
dev_set_drvdata(dev, rv3029);
rv3029_trickle_config(dev);
rv3029_hwmon_register(dev, name);
rv3029->rtc = devm_rtc_device_register(dev, name, &rv3029_rtc_ops,
THIS_MODULE);
if (IS_ERR(rv3029->rtc)) {
dev_err(dev, "unable to register the class device\n");
return PTR_ERR(rv3029->rtc);
}
if (rv3029->irq > 0) {
rc = devm_request_threaded_irq(dev, rv3029->irq,
NULL, rv3029_handle_irq,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
"rv3029", dev);
if (rc) {
dev_warn(dev, "unable to request IRQ, alarms disabled\n");
rv3029->irq = 0;
} else {
rv3029_rtc_ops.read_alarm = rv3029_read_alarm;
rv3029_rtc_ops.set_alarm = rv3029_set_alarm;
rv3029_rtc_ops.alarm_irq_enable = rv3029_alarm_irq_enable;
}
}
return 0;
}
static const struct regmap_range rv3029_holes_range[] = {
regmap_reg_range(0x05, 0x07),
regmap_reg_range(0x0f, 0x0f),
regmap_reg_range(0x17, 0x17),
regmap_reg_range(0x1a, 0x1f),
regmap_reg_range(0x21, 0x27),
regmap_reg_range(0x34, 0x37),
};
static const struct regmap_access_table rv3029_regs = {
.no_ranges = rv3029_holes_range,
.n_no_ranges = ARRAY_SIZE(rv3029_holes_range),
};
static const struct regmap_config config = {
.reg_bits = 8,
.val_bits = 8,
.rd_table = &rv3029_regs,
.wr_table = &rv3029_regs,
.max_register = 0x3f,
};
#if IS_ENABLED(CONFIG_I2C)
static int rv3029_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct regmap *regmap;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK |
I2C_FUNC_SMBUS_BYTE)) {
dev_err(&client->dev, "Adapter does not support SMBUS_I2C_BLOCK or SMBUS_I2C_BYTE\n");
return -ENODEV;
}
regmap = devm_regmap_init_i2c(client, &config);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "%s: regmap allocation failed: %ld\n",
__func__, PTR_ERR(regmap));
return PTR_ERR(regmap);
}
return rv3029_probe(&client->dev, regmap, client->irq, client->name);
}
static const struct i2c_device_id rv3029_id[] = {
{ "rv3029", 0 },
{ "rv3029c2", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, rv3029_id);
static const struct of_device_id rv3029_of_match[] = {
{ .compatible = "microcrystal,rv3029" },
/* Backward compatibility only, do not use compatibles below: */
{ .compatible = "rv3029" },
{ .compatible = "rv3029c2" },
{ .compatible = "mc,rv3029c2" },
{ }
};
MODULE_DEVICE_TABLE(of, rv3029_of_match);
static struct i2c_driver rv3029_driver = {
.driver = {
.name = "rv3029",
.of_match_table = of_match_ptr(rv3029_of_match),
},
.probe = rv3029_i2c_probe,
.id_table = rv3029_id,
};
static int rv3029_register_driver(void)
{
return i2c_add_driver(&rv3029_driver);
}
static void rv3029_unregister_driver(void)
{
i2c_del_driver(&rv3029_driver);
}
#else
static int rv3029_register_driver(void)
{
return 0;
}
static void rv3029_unregister_driver(void)
{
}
#endif
#if IS_ENABLED(CONFIG_SPI_MASTER)
static int rv3049_probe(struct spi_device *spi)
{
struct regmap *regmap;
regmap = devm_regmap_init_spi(spi, &config);
if (IS_ERR(regmap)) {
dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n",
__func__, PTR_ERR(regmap));
return PTR_ERR(regmap);
}
return rv3029_probe(&spi->dev, regmap, spi->irq, "rv3049");
}
static struct spi_driver rv3049_driver = {
.driver = {
.name = "rv3049",
},
.probe = rv3049_probe,
};
static int rv3049_register_driver(void)
{
return spi_register_driver(&rv3049_driver);
}
static void rv3049_unregister_driver(void)
{
spi_unregister_driver(&rv3049_driver);
}
#else
static int rv3049_register_driver(void)
{
return 0;
}
static void rv3049_unregister_driver(void)
{
}
#endif
static int __init rv30x9_init(void)
{
int ret;
ret = rv3029_register_driver();
if (ret) {
pr_err("Failed to register rv3029 driver: %d\n", ret);
return ret;
}
ret = rv3049_register_driver();
if (ret) {
pr_err("Failed to register rv3049 driver: %d\n", ret);
rv3029_unregister_driver();
}
return ret;
}
module_init(rv30x9_init)
static void __exit rv30x9_exit(void)
{
rv3049_unregister_driver();
rv3029_unregister_driver();
}
module_exit(rv30x9_exit)
MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");
MODULE_AUTHOR("Michael Buesch <m@bues.ch>");
MODULE_DESCRIPTION("Micro Crystal RV3029/RV3049 RTC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:rv3049");
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