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linux/drivers/rtc/rtc-max31335.c
Nathan Chancellor dd7fe5d9fd rtc: max31335: Fix comparison in max31335_volatile_reg() 
Clang warns (or errors with CONFIG_WERROR=y):

    drivers/rtc/rtc-max31335.c:211:36: error: use of logical '||' with constant operand [-Werror,-Wconstant-logical-operand]
      211 |         if (reg == MAX31335_TEMP_DATA_MSB || MAX31335_TEMP_DATA_LSB)
          |                                           ^  ~~~~~~~~~~~~~~~~~~~~~~
    drivers/rtc/rtc-max31335.c:211:36: note: use '|' for a bitwise operation
      211 |         if (reg == MAX31335_TEMP_DATA_MSB || MAX31335_TEMP_DATA_LSB)
          |                                           ^~
          |                                           |
    1 error generated.

This clearly should be a comparison against reg. Fix the comparison so
that max31335_volatile_reg() does not always return true.

Closes: https://github.com/ClangBuiltLinux/linux/issues/1980
Fixes: dedaf03b99 ("rtc: max31335: add driver support")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20240117-rtc-max3133-fix-comparison-v1-1-91e98b29d564@kernel.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2024-01-18 00:59:32 +01:00

698 lines
19 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0
/*
* RTC driver for the MAX31335
*
* Copyright (C) 2023 Analog Devices
*
* Antoniu Miclaus <antoniu.miclaus@analog.com>
*
*/
#include <asm-generic/unaligned.h>
#include <linux/bcd.h>
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/hwmon.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/util_macros.h>
/* MAX31335 Register Map */
#define MAX31335_STATUS1 0x00
#define MAX31335_INT_EN1 0x01
#define MAX31335_STATUS2 0x02
#define MAX31335_INT_EN2 0x03
#define MAX31335_RTC_RESET 0x04
#define MAX31335_RTC_CONFIG 0x05
#define MAX31335_RTC_CONFIG2 0x06
#define MAX31335_TIMESTAMP_CONFIG 0x07
#define MAX31335_TIMER_CONFIG 0x08
#define MAX31335_SECONDS_1_128 0x09
#define MAX31335_SECONDS 0x0A
#define MAX31335_MINUTES 0x0B
#define MAX31335_HOURS 0x0C
#define MAX31335_DAY 0x0D
#define MAX31335_DATE 0x0E
#define MAX31335_MONTH 0x0F
#define MAX31335_YEAR 0x0F
#define MAX31335_ALM1_SEC 0x11
#define MAX31335_ALM1_MIN 0x12
#define MAX31335_ALM1_HRS 0x13
#define MAX31335_ALM1_DAY_DATE 0x14
#define MAX31335_ALM1_MON 0x15
#define MAX31335_ALM1_YEAR 0x16
#define MAX31335_ALM2_MIN 0x17
#define MAX31335_ALM2_HRS 0x18
#define MAX31335_ALM2_DAY_DATE 0x19
#define MAX31335_TIMER_COUNT 0x1A
#define MAX31335_TIMER_INIT 0x1B
#define MAX31335_PWR_MGMT 0x1C
#define MAX31335_TRICKLE_REG 0x1D
#define MAX31335_AGING_OFFSET 0x1E
#define MAX31335_TS_CONFIG 0x30
#define MAX31335_TEMP_ALARM_HIGH_MSB 0x31
#define MAX31335_TEMP_ALARM_HIGH_LSB 0x32
#define MAX31335_TEMP_ALARM_LOW_MSB 0x33
#define MAX31335_TEMP_ALARM_LOW_LSB 0x34
#define MAX31335_TEMP_DATA_MSB 0x35
#define MAX31335_TEMP_DATA_LSB 0x36
#define MAX31335_TS0_SEC_1_128 0x40
#define MAX31335_TS0_SEC 0x41
#define MAX31335_TS0_MIN 0x42
#define MAX31335_TS0_HOUR 0x43
#define MAX31335_TS0_DATE 0x44
#define MAX31335_TS0_MONTH 0x45
#define MAX31335_TS0_YEAR 0x46
#define MAX31335_TS0_FLAGS 0x47
#define MAX31335_TS1_SEC_1_128 0x48
#define MAX31335_TS1_SEC 0x49
#define MAX31335_TS1_MIN 0x4A
#define MAX31335_TS1_HOUR 0x4B
#define MAX31335_TS1_DATE 0x4C
#define MAX31335_TS1_MONTH 0x4D
#define MAX31335_TS1_YEAR 0x4E
#define MAX31335_TS1_FLAGS 0x4F
#define MAX31335_TS2_SEC_1_128 0x50
#define MAX31335_TS2_SEC 0x51
#define MAX31335_TS2_MIN 0x52
#define MAX31335_TS2_HOUR 0x53
#define MAX31335_TS2_DATE 0x54
#define MAX31335_TS2_MONTH 0x55
#define MAX31335_TS2_YEAR 0x56
#define MAX31335_TS2_FLAGS 0x57
#define MAX31335_TS3_SEC_1_128 0x58
#define MAX31335_TS3_SEC 0x59
#define MAX31335_TS3_MIN 0x5A
#define MAX31335_TS3_HOUR 0x5B
#define MAX31335_TS3_DATE 0x5C
#define MAX31335_TS3_MONTH 0x5D
#define MAX31335_TS3_YEAR 0x5E
#define MAX31335_TS3_FLAGS 0x5F
/* MAX31335_STATUS1 Bit Definitions */
#define MAX31335_STATUS1_PSDECT BIT(7)
#define MAX31335_STATUS1_OSF BIT(6)
#define MAX31335_STATUS1_PFAIL BIT(5)
#define MAX31335_STATUS1_VBATLOW BIT(4)
#define MAX31335_STATUS1_DIF BIT(3)
#define MAX31335_STATUS1_TIF BIT(2)
#define MAX31335_STATUS1_A2F BIT(1)
#define MAX31335_STATUS1_A1F BIT(0)
/* MAX31335_INT_EN1 Bit Definitions */
#define MAX31335_INT_EN1_DOSF BIT(6)
#define MAX31335_INT_EN1_PFAILE BIT(5)
#define MAX31335_INT_EN1_VBATLOWE BIT(4)
#define MAX31335_INT_EN1_DIE BIT(3)
#define MAX31335_INT_EN1_TIE BIT(2)
#define MAX31335_INT_EN1_A2IE BIT(1)
#define MAX31335_INT_EN1_A1IE BIT(0)
/* MAX31335_STATUS2 Bit Definitions */
#define MAX31335_STATUS2_TEMP_RDY BIT(2)
#define MAX31335_STATUS2_OTF BIT(1)
#define MAX31335_STATUS2_UTF BIT(0)
/* MAX31335_INT_EN2 Bit Definitions */
#define MAX31335_INT_EN2_TEMP_RDY_EN BIT(2)
#define MAX31335_INT_EN2_OTIE BIT(1)
#define MAX31335_INT_EN2_UTIE BIT(0)
/* MAX31335_RTC_RESET Bit Definitions */
#define MAX31335_RTC_RESET_SWRST BIT(0)
/* MAX31335_RTC_CONFIG1 Bit Definitions */
#define MAX31335_RTC_CONFIG1_EN_IO BIT(6)
#define MAX31335_RTC_CONFIG1_A1AC GENMASK(5, 4)
#define MAX31335_RTC_CONFIG1_DIP BIT(3)
#define MAX31335_RTC_CONFIG1_I2C_TIMEOUT BIT(1)
#define MAX31335_RTC_CONFIG1_EN_OSC BIT(0)
/* MAX31335_RTC_CONFIG2 Bit Definitions */
#define MAX31335_RTC_CONFIG2_ENCLKO BIT(2)
#define MAX31335_RTC_CONFIG2_CLKO_HZ GENMASK(1, 0)
/* MAX31335_TIMESTAMP_CONFIG Bit Definitions */
#define MAX31335_TIMESTAMP_CONFIG_TSVLOW BIT(5)
#define MAX31335_TIMESTAMP_CONFIG_TSPWM BIT(4)
#define MAX31335_TIMESTAMP_CONFIG_TSDIN BIT(3)
#define MAX31335_TIMESTAMP_CONFIG_TSOW BIT(2)
#define MAX31335_TIMESTAMP_CONFIG_TSR BIT(1)
#define MAX31335_TIMESTAMP_CONFIG_TSE BIT(0)
/* MAX31335_TIMER_CONFIG Bit Definitions */
#define MAX31335_TIMER_CONFIG_TE BIT(4)
#define MAX31335_TIMER_CONFIG_TPAUSE BIT(3)
#define MAX31335_TIMER_CONFIG_TRPT BIT(2)
#define MAX31335_TIMER_CONFIG_TFS GENMASK(1, 0)
/* MAX31335_HOURS Bit Definitions */
#define MAX31335_HOURS_F_24_12 BIT(6)
#define MAX31335_HOURS_HR_20_AM_PM BIT(5)
/* MAX31335_MONTH Bit Definitions */
#define MAX31335_MONTH_CENTURY BIT(7)
/* MAX31335_PWR_MGMT Bit Definitions */
#define MAX31335_PWR_MGMT_PFVT BIT(0)
/* MAX31335_TRICKLE_REG Bit Definitions */
#define MAX31335_TRICKLE_REG_TRICKLE GENMASK(3, 1)
#define MAX31335_TRICKLE_REG_EN_TRICKLE BIT(0)
/* MAX31335_TS_CONFIG Bit Definitions */
#define MAX31335_TS_CONFIG_AUTO BIT(4)
#define MAX31335_TS_CONFIG_CONVERT_T BIT(3)
#define MAX31335_TS_CONFIG_TSINT GENMASK(2, 0)
/* MAX31335_TS_FLAGS Bit Definitions */
#define MAX31335_TS_FLAGS_VLOWF BIT(3)
#define MAX31335_TS_FLAGS_VBATF BIT(2)
#define MAX31335_TS_FLAGS_VCCF BIT(1)
#define MAX31335_TS_FLAGS_DINF BIT(0)
/* MAX31335 Miscellaneous Definitions */
#define MAX31335_TRICKLE_SCHOTTKY_DIODE 1
#define MAX31335_TRICKLE_STANDARD_DIODE 4
#define MAX31335_RAM_SIZE 32
#define MAX31335_TIME_SIZE 0x07
#define clk_hw_to_max31335(_hw) container_of(_hw, struct max31335_data, clkout)
struct max31335_data {
struct regmap *regmap;
struct rtc_device *rtc;
struct clk_hw clkout;
};
static const int max31335_clkout_freq[] = { 1, 64, 1024, 32768 };
static const u16 max31335_trickle_resistors[] = {3000, 6000, 11000};
static bool max31335_volatile_reg(struct device *dev, unsigned int reg)
{
/* time keeping registers */
if (reg >= MAX31335_SECONDS &&
reg < MAX31335_SECONDS + MAX31335_TIME_SIZE)
return true;
/* interrupt status register */
if (reg == MAX31335_INT_EN1_A1IE)
return true;
/* temperature registers */
if (reg == MAX31335_TEMP_DATA_MSB || reg == MAX31335_TEMP_DATA_LSB)
return true;
return false;
}
static const struct regmap_config regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x5F,
.volatile_reg = max31335_volatile_reg,
};
static int max31335_read_time(struct device *dev, struct rtc_time *tm)
{
struct max31335_data *max31335 = dev_get_drvdata(dev);
u8 date[7];
int ret;
ret = regmap_bulk_read(max31335->regmap, MAX31335_SECONDS, 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 = bcd2bin(date[3] & 0x7) - 1;
tm->tm_mday = bcd2bin(date[4] & 0x3f);
tm->tm_mon = bcd2bin(date[5] & 0x1f) - 1;
tm->tm_year = bcd2bin(date[6]) + 100;
if (FIELD_GET(MAX31335_MONTH_CENTURY, date[5]))
tm->tm_year += 100;
return 0;
}
static int max31335_set_time(struct device *dev, struct rtc_time *tm)
{
struct max31335_data *max31335 = dev_get_drvdata(dev);
u8 date[7];
date[0] = bin2bcd(tm->tm_sec);
date[1] = bin2bcd(tm->tm_min);
date[2] = bin2bcd(tm->tm_hour);
date[3] = bin2bcd(tm->tm_wday + 1);
date[4] = bin2bcd(tm->tm_mday);
date[5] = bin2bcd(tm->tm_mon + 1);
date[6] = bin2bcd(tm->tm_year % 100);
if (tm->tm_year >= 200)
date[5] |= FIELD_PREP(MAX31335_MONTH_CENTURY, 1);
return regmap_bulk_write(max31335->regmap, MAX31335_SECONDS, date,
sizeof(date));
}
static int max31335_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct max31335_data *max31335 = dev_get_drvdata(dev);
int ret, ctrl, status;
struct rtc_time time;
u8 regs[6];
ret = regmap_bulk_read(max31335->regmap, MAX31335_ALM1_SEC, regs,
sizeof(regs));
if (ret)
return ret;
alrm->time.tm_sec = bcd2bin(regs[0] & 0x7f);
alrm->time.tm_min = bcd2bin(regs[1] & 0x7f);
alrm->time.tm_hour = bcd2bin(regs[2] & 0x3f);
alrm->time.tm_mday = bcd2bin(regs[3] & 0x3f);
alrm->time.tm_mon = bcd2bin(regs[4] & 0x1f) - 1;
alrm->time.tm_year = bcd2bin(regs[5]) + 100;
ret = max31335_read_time(dev, &time);
if (ret)
return ret;
if (time.tm_year >= 200)
alrm->time.tm_year += 100;
ret = regmap_read(max31335->regmap, MAX31335_INT_EN1, &ctrl);
if (ret)
return ret;
ret = regmap_read(max31335->regmap, MAX31335_STATUS1, &status);
if (ret)
return ret;
alrm->enabled = FIELD_GET(MAX31335_INT_EN1_A1IE, ctrl);
alrm->pending = FIELD_GET(MAX31335_STATUS1_A1F, status);
return 0;
}
static int max31335_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct max31335_data *max31335 = dev_get_drvdata(dev);
unsigned int reg;
u8 regs[6];
int ret;
regs[0] = bin2bcd(alrm->time.tm_sec);
regs[1] = bin2bcd(alrm->time.tm_min);
regs[2] = bin2bcd(alrm->time.tm_hour);
regs[3] = bin2bcd(alrm->time.tm_mday);
regs[4] = bin2bcd(alrm->time.tm_mon + 1);
regs[5] = bin2bcd(alrm->time.tm_year % 100);
ret = regmap_bulk_write(max31335->regmap, MAX31335_ALM1_SEC,
regs, sizeof(regs));
if (ret)
return ret;
reg = FIELD_PREP(MAX31335_INT_EN1_A1IE, alrm->enabled);
ret = regmap_update_bits(max31335->regmap, MAX31335_INT_EN1,
MAX31335_INT_EN1_A1IE, reg);
if (ret)
return ret;
ret = regmap_update_bits(max31335->regmap, MAX31335_STATUS1,
MAX31335_STATUS1_A1F, 0);
return 0;
}
static int max31335_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct max31335_data *max31335 = dev_get_drvdata(dev);
return regmap_update_bits(max31335->regmap, MAX31335_INT_EN1,
MAX31335_INT_EN1_A1IE, enabled);
}
static irqreturn_t max31335_handle_irq(int irq, void *dev_id)
{
struct max31335_data *max31335 = dev_id;
bool status;
int ret;
ret = regmap_update_bits_check(max31335->regmap, MAX31335_STATUS1,
MAX31335_STATUS1_A1F, 0, &status);
if (ret)
return IRQ_HANDLED;
if (status)
rtc_update_irq(max31335->rtc, 1, RTC_AF | RTC_IRQF);
return IRQ_HANDLED;
}
static const struct rtc_class_ops max31335_rtc_ops = {
.read_time = max31335_read_time,
.set_time = max31335_set_time,
.read_alarm = max31335_read_alarm,
.set_alarm = max31335_set_alarm,
.alarm_irq_enable = max31335_alarm_irq_enable,
};
static int max31335_trickle_charger_setup(struct device *dev,
struct max31335_data *max31335)
{
u32 ohms, chargeable;
int i, trickle_cfg;
const char *diode;
if (device_property_read_u32(dev, "aux-voltage-chargeable",
&chargeable))
return 0;
if (device_property_read_u32(dev, "trickle-resistor-ohms", &ohms))
return 0;
if (device_property_read_string(dev, "adi,tc-diode", &diode))
return 0;
if (!strcmp(diode, "schottky"))
trickle_cfg = MAX31335_TRICKLE_SCHOTTKY_DIODE;
else if (!strcmp(diode, "standard+schottky"))
trickle_cfg = MAX31335_TRICKLE_STANDARD_DIODE;
else
return dev_err_probe(dev, -EINVAL,
"Invalid tc-diode value: %s\n", diode);
for (i = 0; i < ARRAY_SIZE(max31335_trickle_resistors); i++)
if (ohms == max31335_trickle_resistors[i])
break;
if (i >= ARRAY_SIZE(max31335_trickle_resistors))
return 0;
i = i + trickle_cfg;
return regmap_write(max31335->regmap, MAX31335_TRICKLE_REG,
FIELD_PREP(MAX31335_TRICKLE_REG_TRICKLE, i) |
FIELD_PREP(MAX31335_TRICKLE_REG_EN_TRICKLE,
chargeable));
}
static unsigned long max31335_clkout_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct max31335_data *max31335 = clk_hw_to_max31335(hw);
unsigned int freq_mask;
unsigned int reg;
int ret;
ret = regmap_read(max31335->regmap, MAX31335_RTC_CONFIG2, &reg);
if (ret)
return 0;
freq_mask = __roundup_pow_of_two(ARRAY_SIZE(max31335_clkout_freq)) - 1;
return max31335_clkout_freq[reg & freq_mask];
}
static long max31335_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
int index;
index = find_closest(rate, max31335_clkout_freq,
ARRAY_SIZE(max31335_clkout_freq));
return max31335_clkout_freq[index];
}
static int max31335_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct max31335_data *max31335 = clk_hw_to_max31335(hw);
unsigned int freq_mask;
int index;
index = find_closest(rate, max31335_clkout_freq,
ARRAY_SIZE(max31335_clkout_freq));
freq_mask = __roundup_pow_of_two(ARRAY_SIZE(max31335_clkout_freq)) - 1;
return regmap_update_bits(max31335->regmap, MAX31335_RTC_CONFIG2,
freq_mask, index);
}
static int max31335_clkout_enable(struct clk_hw *hw)
{
struct max31335_data *max31335 = clk_hw_to_max31335(hw);
return regmap_set_bits(max31335->regmap, MAX31335_RTC_CONFIG2,
MAX31335_RTC_CONFIG2_ENCLKO);
}
static void max31335_clkout_disable(struct clk_hw *hw)
{
struct max31335_data *max31335 = clk_hw_to_max31335(hw);
regmap_clear_bits(max31335->regmap, MAX31335_RTC_CONFIG2,
MAX31335_RTC_CONFIG2_ENCLKO);
}
static int max31335_clkout_is_enabled(struct clk_hw *hw)
{
struct max31335_data *max31335 = clk_hw_to_max31335(hw);
unsigned int reg;
int ret;
ret = regmap_read(max31335->regmap, MAX31335_RTC_CONFIG2, &reg);
if (ret)
return ret;
return !!(reg & MAX31335_RTC_CONFIG2_ENCLKO);
}
static const struct clk_ops max31335_clkout_ops = {
.recalc_rate = max31335_clkout_recalc_rate,
.round_rate = max31335_clkout_round_rate,
.set_rate = max31335_clkout_set_rate,
.enable = max31335_clkout_enable,
.disable = max31335_clkout_disable,
.is_enabled = max31335_clkout_is_enabled,
};
static struct clk_init_data max31335_clk_init = {
.name = "max31335-clkout",
.ops = &max31335_clkout_ops,
};
static int max31335_nvmem_reg_read(void *priv, unsigned int offset,
void *val, size_t bytes)
{
struct max31335_data *max31335 = priv;
unsigned int reg = MAX31335_TS0_SEC_1_128 + offset;
return regmap_bulk_read(max31335->regmap, reg, val, bytes);
}
static int max31335_nvmem_reg_write(void *priv, unsigned int offset,
void *val, size_t bytes)
{
struct max31335_data *max31335 = priv;
unsigned int reg = MAX31335_TS0_SEC_1_128 + offset;
return regmap_bulk_write(max31335->regmap, reg, val, bytes);
}
static struct nvmem_config max31335_nvmem_cfg = {
.reg_read = max31335_nvmem_reg_read,
.reg_write = max31335_nvmem_reg_write,
.word_size = 8,
.size = MAX31335_RAM_SIZE,
};
#if IS_REACHABLE(HWMON)
static int max31335_read_temp(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
struct max31335_data *max31335 = dev_get_drvdata(dev);
u8 reg[2];
s16 temp;
int ret;
if (type != hwmon_temp || attr != hwmon_temp_input)
return -EOPNOTSUPP;
ret = regmap_bulk_read(max31335->regmap, MAX31335_TEMP_DATA_MSB,
reg, 2);
if (ret)
return ret;
temp = get_unaligned_be16(reg);
*val = (temp / 64) * 250;
return 0;
}
static umode_t max31335_is_visible(const void *data,
enum hwmon_sensor_types type,
u32 attr, int channel)
{
if (type == hwmon_temp && attr == hwmon_temp_input)
return 0444;
return 0;
}
static const struct hwmon_channel_info *max31335_info[] = {
HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
NULL
};
static const struct hwmon_ops max31335_hwmon_ops = {
.is_visible = max31335_is_visible,
.read = max31335_read_temp,
};
static const struct hwmon_chip_info max31335_chip_info = {
.ops = &max31335_hwmon_ops,
.info = max31335_info,
};
#endif
static int max31335_clkout_register(struct device *dev)
{
struct max31335_data *max31335 = dev_get_drvdata(dev);
int ret;
if (!device_property_present(dev, "#clock-cells"))
return regmap_clear_bits(max31335->regmap, MAX31335_RTC_CONFIG2,
MAX31335_RTC_CONFIG2_ENCLKO);
max31335->clkout.init = &max31335_clk_init;
ret = devm_clk_hw_register(dev, &max31335->clkout);
if (ret)
return dev_err_probe(dev, ret, "cannot register clock\n");
ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
&max31335->clkout);
if (ret)
return dev_err_probe(dev, ret, "cannot add hw provider\n");
max31335->clkout.clk = devm_clk_get_enabled(dev, NULL);
if (IS_ERR(max31335->clkout.clk))
return dev_err_probe(dev, PTR_ERR(max31335->clkout.clk),
"cannot enable clkout\n");
return 0;
}
static int max31335_probe(struct i2c_client *client)
{
struct max31335_data *max31335;
#if IS_REACHABLE(HWMON)
struct device *hwmon;
#endif
int ret;
max31335 = devm_kzalloc(&client->dev, sizeof(*max31335), GFP_KERNEL);
if (!max31335)
return -ENOMEM;
max31335->regmap = devm_regmap_init_i2c(client, &regmap_config);
if (IS_ERR(max31335->regmap))
return PTR_ERR(max31335->regmap);
i2c_set_clientdata(client, max31335);
max31335->rtc = devm_rtc_allocate_device(&client->dev);
if (IS_ERR(max31335->rtc))
return PTR_ERR(max31335->rtc);
max31335->rtc->ops = &max31335_rtc_ops;
max31335->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
max31335->rtc->range_max = RTC_TIMESTAMP_END_2199;
max31335->rtc->alarm_offset_max = 24 * 60 * 60;
ret = max31335_clkout_register(&client->dev);
if (ret)
return ret;
if (client->irq > 0) {
ret = devm_request_threaded_irq(&client->dev, client->irq,
NULL, max31335_handle_irq,
IRQF_ONESHOT,
"max31335", max31335);
if (ret) {
dev_warn(&client->dev,
"unable to request IRQ, alarm max31335 disabled\n");
client->irq = 0;
}
}
if (!client->irq)
clear_bit(RTC_FEATURE_ALARM, max31335->rtc->features);
max31335_nvmem_cfg.priv = max31335;
ret = devm_rtc_nvmem_register(max31335->rtc, &max31335_nvmem_cfg);
if (ret)
return dev_err_probe(&client->dev, ret,
"cannot register rtc nvmem\n");
#if IS_REACHABLE(HWMON)
hwmon = devm_hwmon_device_register_with_info(&client->dev, client->name,
max31335,
&max31335_chip_info,
NULL);
if (IS_ERR(hwmon))
return dev_err_probe(&client->dev, PTR_ERR(hwmon),
"cannot register hwmon device\n");
#endif
ret = max31335_trickle_charger_setup(&client->dev, max31335);
if (ret)
return ret;
return devm_rtc_register_device(max31335->rtc);
}
static const struct i2c_device_id max31335_id[] = {
{ "max31335", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max31335_id);
static const struct of_device_id max31335_of_match[] = {
{ .compatible = "adi,max31335" },
{ }
};
MODULE_DEVICE_TABLE(of, max31335_of_match);
static struct i2c_driver max31335_driver = {
.driver = {
.name = "rtc-max31335",
.of_match_table = max31335_of_match,
},
.probe = max31335_probe,
.id_table = max31335_id,
};
module_i2c_driver(max31335_driver);
MODULE_AUTHOR("Antoniu Miclaus <antoniu.miclaus@analog.com>");
MODULE_DESCRIPTION("MAX31335 RTC driver");
MODULE_LICENSE("GPL");
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