// SPDX-License-Identifier: GPL-2.0-only
/*
* Micro Crystal RV-3029 / RV-3049 rtc class driver
*
* Author: Gregory Hermant <[email protected]>
* Michael Buesch <[email protected]>
*
* 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/kstrtox.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_RAM_PAGE 0x38
#define RV3029_RAM_SECTION_LEN 8
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_VLOW2)
return -ENODEV;
if (sr & RV3029_STATUS_VLOW1) {
/* 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, 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) {
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);
unsigned int flags, controls;
unsigned long events = 0;
int ret;
rtc_lock(rv3029->rtc);
ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);
if (ret) {
dev_warn(dev, "Read IRQ Control Register error %d\n", ret);
rtc_unlock(rv3029->rtc);
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);
rtc_unlock(rv3029->rtc);
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);
}
rtc_unlock(rv3029->rtc);
return IRQ_HANDLED;
}
static int rv3029_read_time(struct device *dev, struct rtc_time *tm)
{
struct rv3029_data *rv3029 = dev_get_drvdata(dev);
unsigned int sr;
int ret;
u8 regs[RV3029_WATCH_SECTION_LEN] = { 0, };
ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
if (ret < 0)
return ret;
if (sr & (RV3029_STATUS_VLOW2 | RV3029_STATUS_PON))
return -EINVAL;
ret = regmap_bulk_read(rv3029->regmap, RV3029_W_SEC, regs,
RV3029_WATCH_SECTION_LEN);
if (ret < 0)
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)
return ret;
ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);
if (ret)
return ret;
ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);
if (ret < 0)
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];
/* 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;
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 and VLOW2 bits */
return regmap_update_bits(rv3029->regmap, RV3029_STATUS,
RV3029_STATUS_PON | RV3029_STATUS_VLOW2, 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 int rv3029_nvram_write(void *priv, unsigned int offset, void *val,
size_t bytes)
{
return regmap_bulk_write(priv, RV3029_RAM_PAGE + offset, val, bytes);
}
static int rv3029_nvram_read(void *priv, unsigned int offset, void *val,
size_t bytes)
{
return regmap_bulk_read(priv, RV3029_RAM_PAGE + offset, val, bytes);
}
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 const struct rtc_class_ops rv3029_rtc_ops = {
.read_time = rv3029_read_time,
.set_time = rv3029_set_time,
.ioctl = rv3029_ioctl,
.read_alarm = rv3029_read_alarm,
.set_alarm = rv3029_set_alarm,
.alarm_irq_enable = rv3029_alarm_irq_enable,
};
static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,
const char *name)
{
struct rv3029_data *rv3029;
struct nvmem_config nvmem_cfg = {
.name = "rv3029_nvram",
.word_size = 1,
.stride = 1,
.size = RV3029_RAM_SECTION_LEN,
.type = NVMEM_TYPE_BATTERY_BACKED,
.reg_read = rv3029_nvram_read,
.reg_write = rv3029_nvram_write,
};
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_allocate_device(dev);
if (IS_ERR(rv3029->rtc))
return PTR_ERR(rv3029->rtc);
if (rv3029->irq > 0) {
unsigned long irqflags = IRQF_TRIGGER_LOW;
if (dev_fwnode(dev))
irqflags = 0;
rc = devm_request_threaded_irq(dev, rv3029->irq,
NULL, rv3029_handle_irq,
irqflags | IRQF_ONESHOT,
"rv3029", dev);
if (rc) {
dev_warn(dev, "unable to request IRQ, alarms disabled\n");
rv3029->irq = 0;
}
}
if (!rv3029->irq)
clear_bit(RTC_FEATURE_ALARM, rv3029->rtc->features);
rv3029->rtc->ops = &rv3029_rtc_ops;
rv3029->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
rv3029->rtc->range_max = RTC_TIMESTAMP_END_2079;
rc = devm_rtc_register_device(rv3029->rtc);
if (rc)
return rc;
nvmem_cfg.priv = rv3029->regmap;
devm_rtc_nvmem_register(rv3029->rtc, &nvmem_cfg);
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)
{
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))
return PTR_ERR(regmap);
return rv3029_probe(&client->dev, regmap, client->irq, client->name);
}
static const struct i2c_device_id rv3029_id[] = {
{ "rv3029" },
{ "rv3029c2" },
{ }
};
MODULE_DEVICE_TABLE(i2c, rv3029_id);
static const __maybe_unused struct of_device_id rv3029_of_match[] = {
{ .compatible = "microcrystal,rv3029" },
{ }
};
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 __init rv3029_register_driver(void)
{
return i2c_add_driver(&rv3029_driver);
}
static void rv3029_unregister_driver(void)
{
i2c_del_driver(&rv3029_driver);
}
#else
static int __init 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))
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 __init rv3049_register_driver(void)
{
return spi_register_driver(&rv3049_driver);
}
static void __exit rv3049_unregister_driver(void)
{
spi_unregister_driver(&rv3049_driver);
}
#else
static int __init rv3049_register_driver(void)
{
return 0;
}
static void __exit rv3049_unregister_driver(void)
{
}
#endif
static int __init rv30x9_init(void)
{
int ret;
ret = rv3029_register_driver();
if (ret)
return ret;
ret = rv3049_register_driver();
if (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 <[email protected]>");
MODULE_AUTHOR("Michael Buesch <[email protected]>");
MODULE_DESCRIPTION("Micro Crystal RV3029/RV3049 RTC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:rv3049");
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