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48144c2890
linux/drivers/rtc/rtc-rv3032.c
Rob Herring 48144c2890 rtc: Explicitly include correct DT includes 
The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230724205456.767430-1-robh@kernel.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2023-07-27 23:31:29 +02:00

1008 lines
24 KiB
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// SPDX-License-Identifier: GPL-2.0
/*
* RTC driver for the Micro Crystal RV3032
*
* Copyright (C) 2020 Micro Crystal SA
*
* Alexandre Belloni <alexandre.belloni@bootlin.com>
*
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/bcd.h>
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/hwmon.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/log2.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#define RV3032_SEC 0x01
#define RV3032_MIN 0x02
#define RV3032_HOUR 0x03
#define RV3032_WDAY 0x04
#define RV3032_DAY 0x05
#define RV3032_MONTH 0x06
#define RV3032_YEAR 0x07
#define RV3032_ALARM_MIN 0x08
#define RV3032_ALARM_HOUR 0x09
#define RV3032_ALARM_DAY 0x0A
#define RV3032_STATUS 0x0D
#define RV3032_TLSB 0x0E
#define RV3032_TMSB 0x0F
#define RV3032_CTRL1 0x10
#define RV3032_CTRL2 0x11
#define RV3032_CTRL3 0x12
#define RV3032_TS_CTRL 0x13
#define RV3032_CLK_IRQ 0x14
#define RV3032_EEPROM_ADDR 0x3D
#define RV3032_EEPROM_DATA 0x3E
#define RV3032_EEPROM_CMD 0x3F
#define RV3032_RAM1 0x40
#define RV3032_PMU 0xC0
#define RV3032_OFFSET 0xC1
#define RV3032_CLKOUT1 0xC2
#define RV3032_CLKOUT2 0xC3
#define RV3032_TREF0 0xC4
#define RV3032_TREF1 0xC5
#define RV3032_STATUS_VLF BIT(0)
#define RV3032_STATUS_PORF BIT(1)
#define RV3032_STATUS_EVF BIT(2)
#define RV3032_STATUS_AF BIT(3)
#define RV3032_STATUS_TF BIT(4)
#define RV3032_STATUS_UF BIT(5)
#define RV3032_STATUS_TLF BIT(6)
#define RV3032_STATUS_THF BIT(7)
#define RV3032_TLSB_CLKF BIT(1)
#define RV3032_TLSB_EEBUSY BIT(2)
#define RV3032_TLSB_TEMP GENMASK(7, 4)
#define RV3032_CLKOUT2_HFD_MSK GENMASK(4, 0)
#define RV3032_CLKOUT2_FD_MSK GENMASK(6, 5)
#define RV3032_CLKOUT2_OS BIT(7)
#define RV3032_CTRL1_EERD BIT(3)
#define RV3032_CTRL1_WADA BIT(5)
#define RV3032_CTRL2_STOP BIT(0)
#define RV3032_CTRL2_EIE BIT(2)
#define RV3032_CTRL2_AIE BIT(3)
#define RV3032_CTRL2_TIE BIT(4)
#define RV3032_CTRL2_UIE BIT(5)
#define RV3032_CTRL2_CLKIE BIT(6)
#define RV3032_CTRL2_TSE BIT(7)
#define RV3032_PMU_TCM GENMASK(1, 0)
#define RV3032_PMU_TCR GENMASK(3, 2)
#define RV3032_PMU_BSM GENMASK(5, 4)
#define RV3032_PMU_NCLKE BIT(6)
#define RV3032_PMU_BSM_DSM 1
#define RV3032_PMU_BSM_LSM 2
#define RV3032_OFFSET_MSK GENMASK(5, 0)
#define RV3032_EVT_CTRL_TSR BIT(2)
#define RV3032_EEPROM_CMD_UPDATE 0x11
#define RV3032_EEPROM_CMD_WRITE 0x21
#define RV3032_EEPROM_CMD_READ 0x22
#define RV3032_EEPROM_USER 0xCB
#define RV3032_EEBUSY_POLL 10000
#define RV3032_EEBUSY_TIMEOUT 100000
#define OFFSET_STEP_PPT 238419
struct rv3032_data {
struct regmap *regmap;
struct rtc_device *rtc;
bool trickle_charger_set;
#ifdef CONFIG_COMMON_CLK
struct clk_hw clkout_hw;
#endif
};
static u16 rv3032_trickle_resistors[] = {1000, 2000, 7000, 11000};
static u16 rv3032_trickle_voltages[] = {0, 1750, 3000, 4400};
static int rv3032_exit_eerd(struct rv3032_data *rv3032, u32 eerd)
{
if (eerd)
return 0;
return regmap_update_bits(rv3032->regmap, RV3032_CTRL1, RV3032_CTRL1_EERD, 0);
}
static int rv3032_enter_eerd(struct rv3032_data *rv3032, u32 *eerd)
{
u32 ctrl1, status;
int ret;
ret = regmap_read(rv3032->regmap, RV3032_CTRL1, &ctrl1);
if (ret)
return ret;
*eerd = ctrl1 & RV3032_CTRL1_EERD;
if (*eerd)
return 0;
ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL1,
RV3032_CTRL1_EERD, RV3032_CTRL1_EERD);
if (ret)
return ret;
ret = regmap_read_poll_timeout(rv3032->regmap, RV3032_TLSB, status,
!(status & RV3032_TLSB_EEBUSY),
RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT);
if (ret) {
rv3032_exit_eerd(rv3032, *eerd);
return ret;
}
return 0;
}
static int rv3032_update_cfg(struct rv3032_data *rv3032, unsigned int reg,
unsigned int mask, unsigned int val)
{
u32 status, eerd;
int ret;
ret = rv3032_enter_eerd(rv3032, &eerd);
if (ret)
return ret;
ret = regmap_update_bits(rv3032->regmap, reg, mask, val);
if (ret)
goto exit_eerd;
ret = regmap_write(rv3032->regmap, RV3032_EEPROM_CMD, RV3032_EEPROM_CMD_UPDATE);
if (ret)
goto exit_eerd;
usleep_range(46000, RV3032_EEBUSY_TIMEOUT);
ret = regmap_read_poll_timeout(rv3032->regmap, RV3032_TLSB, status,
!(status & RV3032_TLSB_EEBUSY),
RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT);
exit_eerd:
rv3032_exit_eerd(rv3032, eerd);
return ret;
}
static irqreturn_t rv3032_handle_irq(int irq, void *dev_id)
{
struct rv3032_data *rv3032 = dev_id;
unsigned long events = 0;
u32 status = 0, ctrl = 0;
if (regmap_read(rv3032->regmap, RV3032_STATUS, &status) < 0 ||
status == 0) {
return IRQ_NONE;
}
if (status & RV3032_STATUS_TF) {
status |= RV3032_STATUS_TF;
ctrl |= RV3032_CTRL2_TIE;
events |= RTC_PF;
}
if (status & RV3032_STATUS_AF) {
status |= RV3032_STATUS_AF;
ctrl |= RV3032_CTRL2_AIE;
events |= RTC_AF;
}
if (status & RV3032_STATUS_UF) {
status |= RV3032_STATUS_UF;
ctrl |= RV3032_CTRL2_UIE;
events |= RTC_UF;
}
if (events) {
rtc_update_irq(rv3032->rtc, 1, events);
regmap_update_bits(rv3032->regmap, RV3032_STATUS, status, 0);
regmap_update_bits(rv3032->regmap, RV3032_CTRL2, ctrl, 0);
}
return IRQ_HANDLED;
}
static int rv3032_get_time(struct device *dev, struct rtc_time *tm)
{
struct rv3032_data *rv3032 = dev_get_drvdata(dev);
u8 date[7];
int ret, status;
ret = regmap_read(rv3032->regmap, RV3032_STATUS, &status);
if (ret < 0)
return ret;
if (status & (RV3032_STATUS_PORF | RV3032_STATUS_VLF))
return -EINVAL;
ret = regmap_bulk_read(rv3032->regmap, RV3032_SEC, date, sizeof(date));
if (ret)
return ret;
tm->tm_sec = bcd2bin(date[0] & 0x7f);
tm->tm_min = bcd2bin(date[1] & 0x7f);
tm->tm_hour = bcd2bin(date[2] & 0x3f);
tm->tm_wday = date[3] & 0x7;
tm->tm_mday = bcd2bin(date[4] & 0x3f);
tm->tm_mon = bcd2bin(date[5] & 0x1f) - 1;
tm->tm_year = bcd2bin(date[6]) + 100;
return 0;
}
static int rv3032_set_time(struct device *dev, struct rtc_time *tm)
{
struct rv3032_data *rv3032 = dev_get_drvdata(dev);
u8 date[7];
int ret;
date[0] = bin2bcd(tm->tm_sec);
date[1] = bin2bcd(tm->tm_min);
date[2] = bin2bcd(tm->tm_hour);
date[3] = tm->tm_wday;
date[4] = bin2bcd(tm->tm_mday);
date[5] = bin2bcd(tm->tm_mon + 1);
date[6] = bin2bcd(tm->tm_year - 100);
ret = regmap_bulk_write(rv3032->regmap, RV3032_SEC, date,
sizeof(date));
if (ret)
return ret;
ret = regmap_update_bits(rv3032->regmap, RV3032_STATUS,
RV3032_STATUS_PORF | RV3032_STATUS_VLF, 0);
return ret;
}
static int rv3032_get_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct rv3032_data *rv3032 = dev_get_drvdata(dev);
u8 alarmvals[3];
int status, ctrl, ret;
ret = regmap_bulk_read(rv3032->regmap, RV3032_ALARM_MIN, alarmvals,
sizeof(alarmvals));
if (ret)
return ret;
ret = regmap_read(rv3032->regmap, RV3032_STATUS, &status);
if (ret < 0)
return ret;
ret = regmap_read(rv3032->regmap, RV3032_CTRL2, &ctrl);
if (ret < 0)
return ret;
alrm->time.tm_sec = 0;
alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f);
alrm->enabled = !!(ctrl & RV3032_CTRL2_AIE);
alrm->pending = (status & RV3032_STATUS_AF) && alrm->enabled;
return 0;
}
static int rv3032_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct rv3032_data *rv3032 = dev_get_drvdata(dev);
u8 alarmvals[3];
u8 ctrl = 0;
int ret;
ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL2,
RV3032_CTRL2_AIE | RV3032_CTRL2_UIE, 0);
if (ret)
return ret;
alarmvals[0] = bin2bcd(alrm->time.tm_min);
alarmvals[1] = bin2bcd(alrm->time.tm_hour);
alarmvals[2] = bin2bcd(alrm->time.tm_mday);
ret = regmap_update_bits(rv3032->regmap, RV3032_STATUS,
RV3032_STATUS_AF, 0);
if (ret)
return ret;
ret = regmap_bulk_write(rv3032->regmap, RV3032_ALARM_MIN, alarmvals,
sizeof(alarmvals));
if (ret)
return ret;
if (alrm->enabled) {
if (rv3032->rtc->uie_rtctimer.enabled)
ctrl |= RV3032_CTRL2_UIE;
if (rv3032->rtc->aie_timer.enabled)
ctrl |= RV3032_CTRL2_AIE;
}
ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL2,
RV3032_CTRL2_UIE | RV3032_CTRL2_AIE, ctrl);
return ret;
}
static int rv3032_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct rv3032_data *rv3032 = dev_get_drvdata(dev);
int ctrl = 0, ret;
if (enabled) {
if (rv3032->rtc->uie_rtctimer.enabled)
ctrl |= RV3032_CTRL2_UIE;
if (rv3032->rtc->aie_timer.enabled)
ctrl |= RV3032_CTRL2_AIE;
}
ret = regmap_update_bits(rv3032->regmap, RV3032_STATUS,
RV3032_STATUS_AF | RV3032_STATUS_UF, 0);
if (ret)
return ret;
ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL2,
RV3032_CTRL2_UIE | RV3032_CTRL2_AIE, ctrl);
if (ret)
return ret;
return 0;
}
static int rv3032_read_offset(struct device *dev, long *offset)
{
struct rv3032_data *rv3032 = dev_get_drvdata(dev);
int ret, value, steps;
ret = regmap_read(rv3032->regmap, RV3032_OFFSET, &value);
if (ret < 0)
return ret;
steps = sign_extend32(FIELD_GET(RV3032_OFFSET_MSK, value), 5);
*offset = DIV_ROUND_CLOSEST(steps * OFFSET_STEP_PPT, 1000);
return 0;
}
static int rv3032_set_offset(struct device *dev, long offset)
{
struct rv3032_data *rv3032 = dev_get_drvdata(dev);
offset = clamp(offset, -7629L, 7391L) * 1000;
offset = DIV_ROUND_CLOSEST(offset, OFFSET_STEP_PPT);
return rv3032_update_cfg(rv3032, RV3032_OFFSET, RV3032_OFFSET_MSK,
FIELD_PREP(RV3032_OFFSET_MSK, offset));
}
static int rv3032_param_get(struct device *dev, struct rtc_param *param)
{
struct rv3032_data *rv3032 = dev_get_drvdata(dev);
int ret;
switch(param->param) {
u32 value;
case RTC_PARAM_BACKUP_SWITCH_MODE:
ret = regmap_read(rv3032->regmap, RV3032_PMU, &value);
if (ret < 0)
return ret;
value = FIELD_GET(RV3032_PMU_BSM, value);
switch(value) {
case RV3032_PMU_BSM_DSM:
param->uvalue = RTC_BSM_DIRECT;
break;
case RV3032_PMU_BSM_LSM:
param->uvalue = RTC_BSM_LEVEL;
break;
default:
param->uvalue = RTC_BSM_DISABLED;
}
break;
default:
return -EINVAL;
}
return 0;
}
static int rv3032_param_set(struct device *dev, struct rtc_param *param)
{
struct rv3032_data *rv3032 = dev_get_drvdata(dev);
switch(param->param) {
u8 mode;
case RTC_PARAM_BACKUP_SWITCH_MODE:
if (rv3032->trickle_charger_set)
return -EINVAL;
switch (param->uvalue) {
case RTC_BSM_DISABLED:
mode = 0;
break;
case RTC_BSM_DIRECT:
mode = RV3032_PMU_BSM_DSM;
break;
case RTC_BSM_LEVEL:
mode = RV3032_PMU_BSM_LSM;
break;
default:
return -EINVAL;
}
return rv3032_update_cfg(rv3032, RV3032_PMU, RV3032_PMU_BSM,
FIELD_PREP(RV3032_PMU_BSM, mode));
default:
return -EINVAL;
}
return 0;
}
static int rv3032_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
struct rv3032_data *rv3032 = dev_get_drvdata(dev);
int status, val = 0, ret = 0;
switch (cmd) {
case RTC_VL_READ:
ret = regmap_read(rv3032->regmap, RV3032_STATUS, &status);
if (ret < 0)
return ret;
if (status & (RV3032_STATUS_PORF | RV3032_STATUS_VLF))
val = RTC_VL_DATA_INVALID;
return put_user(val, (unsigned int __user *)arg);
default:
return -ENOIOCTLCMD;
}
}
static int rv3032_nvram_write(void *priv, unsigned int offset, void *val, size_t bytes)
{
return regmap_bulk_write(priv, RV3032_RAM1 + offset, val, bytes);
}
static int rv3032_nvram_read(void *priv, unsigned int offset, void *val, size_t bytes)
{
return regmap_bulk_read(priv, RV3032_RAM1 + offset, val, bytes);
}
static int rv3032_eeprom_write(void *priv, unsigned int offset, void *val, size_t bytes)
{
struct rv3032_data *rv3032 = priv;
u32 status, eerd;
int i, ret;
u8 *buf = val;
ret = rv3032_enter_eerd(rv3032, &eerd);
if (ret)
return ret;
for (i = 0; i < bytes; i++) {
ret = regmap_write(rv3032->regmap, RV3032_EEPROM_ADDR,
RV3032_EEPROM_USER + offset + i);
if (ret)
goto exit_eerd;
ret = regmap_write(rv3032->regmap, RV3032_EEPROM_DATA, buf[i]);
if (ret)
goto exit_eerd;
ret = regmap_write(rv3032->regmap, RV3032_EEPROM_CMD,
RV3032_EEPROM_CMD_WRITE);
if (ret)
goto exit_eerd;
usleep_range(RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT);
ret = regmap_read_poll_timeout(rv3032->regmap, RV3032_TLSB, status,
!(status & RV3032_TLSB_EEBUSY),
RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT);
if (ret)
goto exit_eerd;
}
exit_eerd:
rv3032_exit_eerd(rv3032, eerd);
return ret;
}
static int rv3032_eeprom_read(void *priv, unsigned int offset, void *val, size_t bytes)
{
struct rv3032_data *rv3032 = priv;
u32 status, eerd, data;
int i, ret;
u8 *buf = val;
ret = rv3032_enter_eerd(rv3032, &eerd);
if (ret)
return ret;
for (i = 0; i < bytes; i++) {
ret = regmap_write(rv3032->regmap, RV3032_EEPROM_ADDR,
RV3032_EEPROM_USER + offset + i);
if (ret)
goto exit_eerd;
ret = regmap_write(rv3032->regmap, RV3032_EEPROM_CMD,
RV3032_EEPROM_CMD_READ);
if (ret)
goto exit_eerd;
ret = regmap_read_poll_timeout(rv3032->regmap, RV3032_TLSB, status,
!(status & RV3032_TLSB_EEBUSY),
RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT);
if (ret)
goto exit_eerd;
ret = regmap_read(rv3032->regmap, RV3032_EEPROM_DATA, &data);
if (ret)
goto exit_eerd;
buf[i] = data;
}
exit_eerd:
rv3032_exit_eerd(rv3032, eerd);
return ret;
}
static int rv3032_trickle_charger_setup(struct device *dev, struct rv3032_data *rv3032)
{
u32 val, ohms, voltage;
int i;
val = FIELD_PREP(RV3032_PMU_TCM, 1) | FIELD_PREP(RV3032_PMU_BSM, RV3032_PMU_BSM_DSM);
if (!device_property_read_u32(dev, "trickle-voltage-millivolt", &voltage)) {
for (i = 0; i < ARRAY_SIZE(rv3032_trickle_voltages); i++)
if (voltage == rv3032_trickle_voltages[i])
break;
if (i < ARRAY_SIZE(rv3032_trickle_voltages))
val = FIELD_PREP(RV3032_PMU_TCM, i) |
FIELD_PREP(RV3032_PMU_BSM, RV3032_PMU_BSM_LSM);
}
if (device_property_read_u32(dev, "trickle-resistor-ohms", &ohms))
return 0;
for (i = 0; i < ARRAY_SIZE(rv3032_trickle_resistors); i++)
if (ohms == rv3032_trickle_resistors[i])
break;
if (i >= ARRAY_SIZE(rv3032_trickle_resistors)) {
dev_warn(dev, "invalid trickle resistor value\n");
return 0;
}
rv3032->trickle_charger_set = true;
return rv3032_update_cfg(rv3032, RV3032_PMU,
RV3032_PMU_TCR | RV3032_PMU_TCM | RV3032_PMU_BSM,
val | FIELD_PREP(RV3032_PMU_TCR, i));
}
#ifdef CONFIG_COMMON_CLK
#define clkout_hw_to_rv3032(hw) container_of(hw, struct rv3032_data, clkout_hw)
static int clkout_xtal_rates[] = {
32768,
1024,
64,
1,
};
#define RV3032_HFD_STEP 8192
static unsigned long rv3032_clkout_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
int clkout, ret;
struct rv3032_data *rv3032 = clkout_hw_to_rv3032(hw);
ret = regmap_read(rv3032->regmap, RV3032_CLKOUT2, &clkout);
if (ret < 0)
return 0;
if (clkout & RV3032_CLKOUT2_OS) {
unsigned long rate = FIELD_GET(RV3032_CLKOUT2_HFD_MSK, clkout) << 8;
ret = regmap_read(rv3032->regmap, RV3032_CLKOUT1, &clkout);
if (ret < 0)
return 0;
rate += clkout + 1;
return rate * RV3032_HFD_STEP;
}
return clkout_xtal_rates[FIELD_GET(RV3032_CLKOUT2_FD_MSK, clkout)];
}
static long rv3032_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
int i, hfd;
if (rate < RV3032_HFD_STEP)
for (i = 0; i < ARRAY_SIZE(clkout_xtal_rates); i++)
if (clkout_xtal_rates[i] <= rate)
return clkout_xtal_rates[i];
hfd = DIV_ROUND_CLOSEST(rate, RV3032_HFD_STEP);
return RV3032_HFD_STEP * clamp(hfd, 0, 8192);
}
static int rv3032_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct rv3032_data *rv3032 = clkout_hw_to_rv3032(hw);
u32 status, eerd;
int i, hfd, ret;
for (i = 0; i < ARRAY_SIZE(clkout_xtal_rates); i++) {
if (clkout_xtal_rates[i] == rate) {
return rv3032_update_cfg(rv3032, RV3032_CLKOUT2, 0xff,
FIELD_PREP(RV3032_CLKOUT2_FD_MSK, i));
}
}
hfd = DIV_ROUND_CLOSEST(rate, RV3032_HFD_STEP);
hfd = clamp(hfd, 1, 8192) - 1;
ret = rv3032_enter_eerd(rv3032, &eerd);
if (ret)
return ret;
ret = regmap_write(rv3032->regmap, RV3032_CLKOUT1, hfd & 0xff);
if (ret)
goto exit_eerd;
ret = regmap_write(rv3032->regmap, RV3032_CLKOUT2, RV3032_CLKOUT2_OS |
FIELD_PREP(RV3032_CLKOUT2_HFD_MSK, hfd >> 8));
if (ret)
goto exit_eerd;
ret = regmap_write(rv3032->regmap, RV3032_EEPROM_CMD, RV3032_EEPROM_CMD_UPDATE);
if (ret)
goto exit_eerd;
usleep_range(46000, RV3032_EEBUSY_TIMEOUT);
ret = regmap_read_poll_timeout(rv3032->regmap, RV3032_TLSB, status,
!(status & RV3032_TLSB_EEBUSY),
RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT);
exit_eerd:
rv3032_exit_eerd(rv3032, eerd);
return ret;
}
static int rv3032_clkout_prepare(struct clk_hw *hw)
{
struct rv3032_data *rv3032 = clkout_hw_to_rv3032(hw);
return rv3032_update_cfg(rv3032, RV3032_PMU, RV3032_PMU_NCLKE, 0);
}
static void rv3032_clkout_unprepare(struct clk_hw *hw)
{
struct rv3032_data *rv3032 = clkout_hw_to_rv3032(hw);
rv3032_update_cfg(rv3032, RV3032_PMU, RV3032_PMU_NCLKE, RV3032_PMU_NCLKE);
}
static int rv3032_clkout_is_prepared(struct clk_hw *hw)
{
int val, ret;
struct rv3032_data *rv3032 = clkout_hw_to_rv3032(hw);
ret = regmap_read(rv3032->regmap, RV3032_PMU, &val);
if (ret < 0)
return ret;
return !(val & RV3032_PMU_NCLKE);
}
static const struct clk_ops rv3032_clkout_ops = {
.prepare = rv3032_clkout_prepare,
.unprepare = rv3032_clkout_unprepare,
.is_prepared = rv3032_clkout_is_prepared,
.recalc_rate = rv3032_clkout_recalc_rate,
.round_rate = rv3032_clkout_round_rate,
.set_rate = rv3032_clkout_set_rate,
};
static int rv3032_clkout_register_clk(struct rv3032_data *rv3032,
struct i2c_client *client)
{
int ret;
struct clk *clk;
struct clk_init_data init;
struct device_node *node = client->dev.of_node;
ret = regmap_update_bits(rv3032->regmap, RV3032_TLSB, RV3032_TLSB_CLKF, 0);
if (ret < 0)
return ret;
ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL2, RV3032_CTRL2_CLKIE, 0);
if (ret < 0)
return ret;
ret = regmap_write(rv3032->regmap, RV3032_CLK_IRQ, 0);
if (ret < 0)
return ret;
init.name = "rv3032-clkout";
init.ops = &rv3032_clkout_ops;
init.flags = 0;
init.parent_names = NULL;
init.num_parents = 0;
rv3032->clkout_hw.init = &init;
of_property_read_string(node, "clock-output-names", &init.name);
clk = devm_clk_register(&client->dev, &rv3032->clkout_hw);
if (!IS_ERR(clk))
of_clk_add_provider(node, of_clk_src_simple_get, clk);
return 0;
}
#endif
static int rv3032_hwmon_read_temp(struct device *dev, long *mC)
{
struct rv3032_data *rv3032 = dev_get_drvdata(dev);
u8 buf[2];
int temp, prev = 0;
int ret;
ret = regmap_bulk_read(rv3032->regmap, RV3032_TLSB, buf, sizeof(buf));
if (ret)
return ret;
temp = sign_extend32(buf[1], 7) << 4;
temp |= FIELD_GET(RV3032_TLSB_TEMP, buf[0]);
/* No blocking or shadowing on RV3032_TLSB and RV3032_TMSB */
do {
prev = temp;
ret = regmap_bulk_read(rv3032->regmap, RV3032_TLSB, buf, sizeof(buf));
if (ret)
return ret;
temp = sign_extend32(buf[1], 7) << 4;
temp |= FIELD_GET(RV3032_TLSB_TEMP, buf[0]);
} while (temp != prev);
*mC = (temp * 1000) / 16;
return 0;
}
static umode_t rv3032_hwmon_is_visible(const void *data, enum hwmon_sensor_types type,
u32 attr, int channel)
{
if (type != hwmon_temp)
return 0;
switch (attr) {
case hwmon_temp_input:
return 0444;
default:
return 0;
}
}
static int rv3032_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *temp)
{
int err;
switch (attr) {
case hwmon_temp_input:
err = rv3032_hwmon_read_temp(dev, temp);
break;
default:
err = -EOPNOTSUPP;
break;
}
return err;
}
static const struct hwmon_channel_info * const rv3032_hwmon_info[] = {
HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST),
NULL
};
static const struct hwmon_ops rv3032_hwmon_hwmon_ops = {
.is_visible = rv3032_hwmon_is_visible,
.read = rv3032_hwmon_read,
};
static const struct hwmon_chip_info rv3032_hwmon_chip_info = {
.ops = &rv3032_hwmon_hwmon_ops,
.info = rv3032_hwmon_info,
};
static void rv3032_hwmon_register(struct device *dev)
{
struct rv3032_data *rv3032 = dev_get_drvdata(dev);
if (!IS_REACHABLE(CONFIG_HWMON))
return;
devm_hwmon_device_register_with_info(dev, "rv3032", rv3032, &rv3032_hwmon_chip_info, NULL);
}
static const struct rtc_class_ops rv3032_rtc_ops = {
.read_time = rv3032_get_time,
.set_time = rv3032_set_time,
.read_offset = rv3032_read_offset,
.set_offset = rv3032_set_offset,
.ioctl = rv3032_ioctl,
.read_alarm = rv3032_get_alarm,
.set_alarm = rv3032_set_alarm,
.alarm_irq_enable = rv3032_alarm_irq_enable,
.param_get = rv3032_param_get,
.param_set = rv3032_param_set,
};
static const struct regmap_config regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0xCA,
};
static int rv3032_probe(struct i2c_client *client)
{
struct rv3032_data *rv3032;
int ret, status;
struct nvmem_config nvmem_cfg = {
.name = "rv3032_nvram",
.word_size = 1,
.stride = 1,
.size = 16,
.type = NVMEM_TYPE_BATTERY_BACKED,
.reg_read = rv3032_nvram_read,
.reg_write = rv3032_nvram_write,
};
struct nvmem_config eeprom_cfg = {
.name = "rv3032_eeprom",
.word_size = 1,
.stride = 1,
.size = 32,
.type = NVMEM_TYPE_EEPROM,
.reg_read = rv3032_eeprom_read,
.reg_write = rv3032_eeprom_write,
};
rv3032 = devm_kzalloc(&client->dev, sizeof(struct rv3032_data),
GFP_KERNEL);
if (!rv3032)
return -ENOMEM;
rv3032->regmap = devm_regmap_init_i2c(client, &regmap_config);
if (IS_ERR(rv3032->regmap))
return PTR_ERR(rv3032->regmap);
i2c_set_clientdata(client, rv3032);
ret = regmap_read(rv3032->regmap, RV3032_STATUS, &status);
if (ret < 0)
return ret;
rv3032->rtc = devm_rtc_allocate_device(&client->dev);
if (IS_ERR(rv3032->rtc))
return PTR_ERR(rv3032->rtc);
if (client->irq > 0) {
unsigned long irqflags = IRQF_TRIGGER_LOW;
if (dev_fwnode(&client->dev))
irqflags = 0;
ret = devm_request_threaded_irq(&client->dev, client->irq,
NULL, rv3032_handle_irq,
irqflags | IRQF_ONESHOT,
"rv3032", rv3032);
if (ret) {
dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
client->irq = 0;
}
}
if (!client->irq)
clear_bit(RTC_FEATURE_ALARM, rv3032->rtc->features);
ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL1,
RV3032_CTRL1_WADA, RV3032_CTRL1_WADA);
if (ret)
return ret;
rv3032_trickle_charger_setup(&client->dev, rv3032);
set_bit(RTC_FEATURE_BACKUP_SWITCH_MODE, rv3032->rtc->features);
set_bit(RTC_FEATURE_ALARM_RES_MINUTE, rv3032->rtc->features);
rv3032->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
rv3032->rtc->range_max = RTC_TIMESTAMP_END_2099;
rv3032->rtc->ops = &rv3032_rtc_ops;
ret = devm_rtc_register_device(rv3032->rtc);
if (ret)
return ret;
nvmem_cfg.priv = rv3032->regmap;
devm_rtc_nvmem_register(rv3032->rtc, &nvmem_cfg);
eeprom_cfg.priv = rv3032;
devm_rtc_nvmem_register(rv3032->rtc, &eeprom_cfg);
rv3032->rtc->max_user_freq = 1;
#ifdef CONFIG_COMMON_CLK
rv3032_clkout_register_clk(rv3032, client);
#endif
rv3032_hwmon_register(&client->dev);
return 0;
}
static const struct acpi_device_id rv3032_i2c_acpi_match[] = {
{ "MCRY3032" },
{ }
};
MODULE_DEVICE_TABLE(acpi, rv3032_i2c_acpi_match);
static const __maybe_unused struct of_device_id rv3032_of_match[] = {
{ .compatible = "microcrystal,rv3032", },
{ }
};
MODULE_DEVICE_TABLE(of, rv3032_of_match);
static struct i2c_driver rv3032_driver = {
.driver = {
.name = "rtc-rv3032",
.acpi_match_table = rv3032_i2c_acpi_match,
.of_match_table = of_match_ptr(rv3032_of_match),
},
.probe = rv3032_probe,
};
module_i2c_driver(rv3032_driver);
MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");
MODULE_DESCRIPTION("Micro Crystal RV3032 RTC driver");
MODULE_LICENSE("GPL v2");
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