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rtc: max77851: add max77851 rtc driver

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Add max77851 rtc driver into nvidia-oot repo

Fix jammy-src kernel-only build max77851 rtc
in embedded recovery defconfig
 - guard regmap function calls with CONFIG_REGMAP_IRQ
 - guard i2c call with CONFIG_I2C

Bug 200749982

Change-Id: I9bfcbfa7bab42f393c7baa1f3dba78d599ca510a
Signed-off-by: Shubhi Garg <shgarg@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-5.10/+/2595387
Signed-off-by: Bitan Biswas <bbiswas@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2947783
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Shubhi Garg
2021-09-16 16:30:42 +05:30
committed by mobile promotions
parent 83b0f18aa3
commit da71dfa5a5
2 changed files with 897 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/rtc/Makefile
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@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
# SPDX-FileCopyrightText: Copyright (c) 2022-2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
ifdef CONFIG_I2C
obj-m += nvvrs-pseq-rtc.o
endif
obj-m += rtc-max77851.o

895
drivers/rtc/rtc-max77851.c Normal file
View File

@@ -0,0 +1,895 @@
// SPDX-License-Identifier: GPL-2.0
// SPDX-FileCopyrightText: Copyright (c) 2022-2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
/*
* RTC driver for Maxim MAX77851
*/
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/rtc.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mfd/max77851.h>
#include <linux/irqdomain.h>
#include <linux/regmap.h>
#define MAX77851_I2C_ADDR_RTC 0x68
#define MAX77851_INVALID_I2C_ADDR (-1)
/* Define non existing register */
#define MAX77851_INVALID_REG (-1)
/* RTC Control Register */
#define BCD_EN_SHIFT RTC_CFG0_BCD
#define BCD_EN_MASK RTC_CFG0_BCD
#define MODEL24_SHIFT RTC_CFG0_HRMODE
#define MODEL24_MASK RTC_CFG0_HRMODE
/* RTC Update Register1 */
#define RTC_UDR_SHIFT RTC_UPDATE_UDR
#define RTC_UDR_MASK RTC_UPDATE_UDR
#define RTC_RBUDR_SHIFT RTC_UPDATE_RBUDR
#define RTC_RBUDR_MASK RTC_UPDATE_RBUDR
/* RTC Hour register */
#define HOUR_PM_SHIFT RTC_HOUR_AMPM
#define HOUR_PM_MASK RTC_HOUR_AMPM
/* RTC Alarm Enable */
#define ALARM_ENABLE_SHIFT 7
#define ALARM_ENABLE_MASK ALARM_ENABLE_SHIFT
#define REG_RTC_NONE 0xdeadbeef
#define MAX77851_ALARM_ENABLE_VALUE 0x7f
#define MAX77851_ALARM_WORK_INTERVAL msecs_to_jiffies(2000)
#define MAX77851_ALARM_DELAY_SECOND 10
enum {
RTC_SEC = 0,
RTC_MIN,
RTC_HOUR,
RTC_WEEKDAY,
RTC_MONTH,
RTC_YEAR,
RTC_DATE,
RTC_NR_TIME
};
struct max77851_rtc_driver_data {
/* Minimum usecs needed for a RTC update */
unsigned long delay;
/* Mask used to read RTC registers value */
u8 mask;
/* Registers offset to I2C addresses map */
const unsigned int *map;
/* Has a separate alarm enable register */
bool alarm_enable_reg;
/* I2C address for RTC block */
int rtc_i2c_addr;
/* RTC interrupt via platform resource */
bool rtc_irq_from_platform;
/* Pending alarm status register */
int alarm_pending_status_reg;
/* RTC IRQ CHIP for regmap */
const struct regmap_irq_chip *rtc_irq_chip;
bool avoid_rtc_bulk_write;
};
struct max77851_rtc_info {
struct device *dev;
struct i2c_client *rtc;
struct rtc_device *rtc_dev;
struct mutex lock;
struct regmap *regmap;
struct regmap *rtc_regmap;
const struct max77851_rtc_driver_data *drv_data;
struct regmap_irq_chip_data *rtc_irq_data;
int rtc_irq;
int rtc_alarm1_virq;
bool rtc_24hr_mode;
bool rtc_binary_mode;
bool shutdown;
};
enum MAX77851_RTC_OP {
MAX77851_RTC_WRITE,
MAX77851_RTC_READ,
};
/* These are not registers but just offsets that are mapped to addresses */
enum max77851_rtc_reg_offset {
REG_RTC_INT = 0,
REG_RTC_INTM,
REG_RTC_CONTROLM,
REG_RTC_CONTROL,
REG_RTC_CONFIG,
REG_RTC_UPDATE0,
REG_RTC_SEC,
REG_RTC_MIN,
REG_RTC_HOUR,
REG_RTC_WEEKDAY,
REG_RTC_MONTH,
REG_RTC_YEAR,
REG_RTC_DATE,
REG_ALARM1_SEC,
REG_ALARM1_MIN,
REG_ALARM1_HOUR,
REG_ALARM1_WEEKDAY,
REG_ALARM1_MONTH,
REG_ALARM1_YEAR,
REG_ALARM1_DATE,
REG_ALARM2_SEC,
REG_ALARM2_MIN,
REG_ALARM2_HOUR,
REG_ALARM2_WEEKDAY,
REG_ALARM2_MONTH,
REG_ALARM2_YEAR,
REG_ALARM2_DATE,
REG_RTC_AE1,
REG_RTC_AE2,
REG_RTC_END,
};
static const struct regmap_irq max77851_rtc_irqs[] = {
/* RTC interrupts */
REGMAP_IRQ_REG(0, 0, RTC_MSK_RTC60S_M),
REGMAP_IRQ_REG(1, 0, RTC_MSK_RTCA1_M),
REGMAP_IRQ_REG(2, 0, RTC_MSK_RTCA2_M),
REGMAP_IRQ_REG(3, 0, RTC_MSK_RTC1S_M),
};
/* Maps RTC registers offset to the MAX77851 register addresses */
static const unsigned int max77851_map[REG_RTC_END] = {
[REG_RTC_INT] = RTC_INT_REG,
[REG_RTC_INTM] = RTC_MSK_REG,
[REG_RTC_CONTROLM] = RTC_CFG0M_REG,
[REG_RTC_CONTROL] = RTC_CFG0_REG,
[REG_RTC_CONFIG] = RTC_CFG1_REG,
[REG_RTC_UPDATE0] = RTC_UPDATE_REG,
[REG_RTC_SEC] = RTC_SEC_REG,
[REG_RTC_MIN] = RTC_MIN_REG,
[REG_RTC_HOUR] = RTC_HOUR_REG,
[REG_RTC_WEEKDAY] = RTC_DOW_REG,
[REG_RTC_MONTH] = RTC_MONTH_REG,
[REG_RTC_YEAR] = RTC_YEAR_REG,
[REG_RTC_DATE] = RTC_DOM_REG,
[REG_ALARM1_SEC] = RTC_SECA1_REG,
[REG_ALARM1_MIN] = RTC_MINA1_REG,
[REG_ALARM1_HOUR] = RTC_HOURA1_REG,
[REG_ALARM1_WEEKDAY] = RTC_DOWA1_REG,
[REG_ALARM1_MONTH] = RTC_MONTHA1_REG,
[REG_ALARM1_YEAR] = RTC_YEARA1_REG,
[REG_ALARM1_DATE] = RTC_DOMA1_REG,
[REG_ALARM2_SEC] = RTC_SECA2_REG,
[REG_ALARM2_MIN] = RTC_MINA2_REG,
[REG_ALARM2_HOUR] = RTC_HOURA2_REG,
[REG_ALARM2_WEEKDAY] = RTC_DOWA2_REG,
[REG_ALARM2_MONTH] = RTC_MONTHA2_REG,
[REG_ALARM2_YEAR] = RTC_YEARA2_REG,
[REG_ALARM2_DATE] = RTC_DOMA2_REG,
[REG_RTC_AE1] = RTC_AE1_REG,
[REG_RTC_AE2] = RTC_AE2_REG,
};
static const struct regmap_irq_chip max77851_rtc_irq_chip = {
.name = "max77851-rtc",
.status_base = RTC_INT_REG,
.mask_base = RTC_MSK_REG,
.num_regs = 1,
.irqs = max77851_rtc_irqs,
.num_irqs = ARRAY_SIZE(max77851_rtc_irqs),
};
static const struct max77851_rtc_driver_data max77851_drv_data = {
.delay = 200,
.mask = 0xff,
.map = max77851_map,
.alarm_enable_reg = true,
.rtc_irq_from_platform = false,
.alarm_pending_status_reg = TOP_STAT0_REG,
.rtc_i2c_addr = MAX77851_I2C_ADDR_RTC,
.rtc_irq_chip = &max77851_rtc_irq_chip,
};
static inline int _regmap_bulk_write(struct max77851_rtc_info *info,
unsigned int reg, void *val, int len)
{
int ret = 0;
if (!info->drv_data->avoid_rtc_bulk_write) {
/* RTC registers support sequential writing */
ret = regmap_bulk_write(info->rtc_regmap, reg, val, len);
} else {
/* Power registers support register-data pair writing */
u8 *src = (u8 *)val;
int i;
for (i = 0; i < len; i++) {
ret = regmap_write(info->rtc_regmap, reg, *src++);
if (ret < 0)
break;
reg++;
}
}
if (ret < 0)
dev_err(info->dev, "%s() failed, e %d\n", __func__, ret);
return ret;
}
static void max77851_rtc_data_to_tm(u8 *data, struct rtc_time *tm,
struct max77851_rtc_info *info)
{
u8 mask = info->drv_data->mask;
tm->tm_sec = data[RTC_SEC] & mask;
tm->tm_min = data[RTC_MIN] & mask;
if (info->rtc_24hr_mode) {
tm->tm_hour = data[RTC_HOUR] & 0x1f;
} else {
tm->tm_hour = data[RTC_HOUR] & 0x0f;
if (data[RTC_HOUR] & HOUR_PM_MASK)
tm->tm_hour += 12;
}
tm->tm_wday = ffs(data[RTC_WEEKDAY] & mask) - 1;
tm->tm_mday = data[RTC_DATE] & 0x1f;
tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
tm->tm_year = (data[RTC_YEAR] & mask) + 100;
tm->tm_yday = 0;
tm->tm_isdst = 0;
}
static int max77851_rtc_tm_to_data(struct rtc_time *tm, u8 *data,
struct max77851_rtc_info *info)
{
data[RTC_SEC] = tm->tm_sec;
data[RTC_MIN] = tm->tm_min;
data[RTC_HOUR] = tm->tm_hour;
data[RTC_WEEKDAY] = 1 << tm->tm_wday;
data[RTC_DATE] = tm->tm_mday;
data[RTC_MONTH] = tm->tm_mon + 1;
if (info->drv_data->alarm_enable_reg) {
data[RTC_YEAR] = tm->tm_year;
return 0;
}
data[RTC_YEAR] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
if (tm->tm_year < 100) {
dev_err(info->dev, "RTC cannot handle the year %d.\n",
1900 + tm->tm_year);
return -EINVAL;
}
return 0;
}
static int max77851_rtc_update(struct max77851_rtc_info *info,
enum MAX77851_RTC_OP op)
{
int ret;
unsigned int data;
unsigned long delay = info->drv_data->delay;
if (op == MAX77851_RTC_WRITE)
data = RTC_UPDATE_UDR;
else
data = RTC_UPDATE_RBUDR;
ret = regmap_write(info->rtc_regmap, info->drv_data->map[REG_RTC_UPDATE0],
data);
if (ret < 0)
dev_err(info->dev, "Fail to write update reg(ret=%d, data=0x%x)\n",
ret, data);
else {
/* Minimum delay required before RTC update. */
usleep_range(delay, delay * 2);
}
return ret;
}
static int max77851_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct max77851_rtc_info *info = dev_get_drvdata(dev);
u8 data[RTC_NR_TIME];
int ret;
mutex_lock(&info->lock);
ret = max77851_rtc_update(info, MAX77851_RTC_READ);
if (ret < 0)
goto out;
ret = regmap_bulk_read(info->rtc_regmap,
info->drv_data->map[REG_RTC_SEC],
data, ARRAY_SIZE(data));
if (ret < 0) {
dev_err(info->dev, "Fail to read time reg(%d)\n", ret);
goto out;
}
max77851_rtc_data_to_tm(data, tm, info);
ret = rtc_valid_tm(tm);
out:
mutex_unlock(&info->lock);
return ret;
}
static int max77851_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct max77851_rtc_info *info = dev_get_drvdata(dev);
u8 data[RTC_NR_TIME];
int ret;
struct rtc_time read_tm;
ret = max77851_rtc_tm_to_data(tm, data, info);
if (ret < 0)
return ret;
mutex_lock(&info->lock);
ret = _regmap_bulk_write(info,
info->drv_data->map[REG_RTC_SEC],
data, ARRAY_SIZE(data));
if (ret < 0) {
dev_err(info->dev, "Fail to write time reg(%d)\n", ret);
goto out;
}
ret = max77851_rtc_update(info, MAX77851_RTC_WRITE);
ret = max77851_rtc_update(info, MAX77851_RTC_READ);
max77851_rtc_read_time(dev, &read_tm);
out:
mutex_unlock(&info->lock);
return ret;
}
static int max77851_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct max77851_rtc_info *info = dev_get_drvdata(dev);
u8 data[RTC_NR_TIME];
unsigned int val;
const unsigned int *map = info->drv_data->map;
int ret;
mutex_lock(&info->lock);
ret = max77851_rtc_update(info, MAX77851_RTC_READ);
if (ret < 0)
goto out;
ret = regmap_bulk_read(info->rtc_regmap, map[REG_ALARM1_SEC],
data, ARRAY_SIZE(data));
if (ret < 0) {
dev_err(info->dev, "Fail to read alarm reg(%d)\n", ret);
goto out;
}
max77851_rtc_data_to_tm(data, &alrm->time, info);
alrm->enabled = 0;
if (info->drv_data->alarm_enable_reg) {
if (map[REG_RTC_AE1] == REG_RTC_NONE) {
ret = -EINVAL;
dev_err(info->dev,
"alarm enable register not set(%d)\n", ret);
goto out;
}
ret = regmap_read(info->rtc_regmap, map[REG_RTC_AE1], &val);
if (ret < 0) {
dev_err(info->dev,
"fail to read alarm enable(%d)\n", ret);
goto out;
}
if (val)
alrm->enabled = 1;
} else {
dev_err(info->dev, "Fail (alarm_enable_reg)\n");
goto out;
}
alrm->pending = 0;
if (info->drv_data->alarm_pending_status_reg == MAX77851_INVALID_REG)
goto out;
ret = regmap_read(info->regmap,
info->drv_data->alarm_pending_status_reg, &val);
if (ret < 0) {
dev_err(info->dev,
"Fail to read alarm pending status reg(%d)\n", ret);
goto out;
}
if (val & (1 << 7)) /* RTCA1 */
alrm->pending = 1;
out:
mutex_unlock(&info->lock);
return ret;
}
static int max77851_rtc_stop_alarm(struct max77851_rtc_info *info)
{
int ret;
const unsigned int *map = info->drv_data->map;
if (!mutex_is_locked(&info->lock))
dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
ret = max77851_rtc_update(info, MAX77851_RTC_READ);
if (ret < 0)
goto out;
if (info->drv_data->alarm_enable_reg) {
if (map[REG_RTC_AE1] == REG_RTC_NONE) {
ret = -EINVAL;
dev_err(info->dev,
"alarm enable register not set(%d)\n", ret);
goto out;
}
ret = regmap_write(info->rtc_regmap, map[REG_RTC_AE1], 0);
} else {
dev_err(info->dev, "Fail (alarm_enable_reg)\n");
goto out;
}
if (ret < 0) {
dev_err(info->dev, "Fail to write alarm reg(%d)\n", ret);
goto out;
}
/* RTC Interrupt Mask */
ret = regmap_update_bits(info->rtc_regmap, RTC_INT_REG, RTC_INT_RTCA1_I, RTC_INT_RTCA1_I);
if (ret < 0) {
dev_err(info->dev, "RTC register set failed: %d\n", ret);
return ret;
}
ret = max77851_rtc_update(info, MAX77851_RTC_WRITE);
out:
return ret;
}
static int max77851_rtc_start_alarm(struct max77851_rtc_info *info)
{
int ret;
const unsigned int *map = info->drv_data->map;
if (!mutex_is_locked(&info->lock))
dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
ret = max77851_rtc_update(info, MAX77851_RTC_READ);
if (ret < 0)
goto out;
if (info->drv_data->alarm_enable_reg) {
ret = regmap_write(info->rtc_regmap, map[REG_RTC_AE1],
MAX77851_ALARM_ENABLE_VALUE);
} else {
dev_err(info->dev, "Fail (alarm_enable_reg)\n");
goto out;
}
if (ret < 0) {
dev_err(info->dev, "Fail to write alarm reg(%d)\n", ret);
goto out;
}
/* RTC Interrupt Unmask */
ret = regmap_update_bits(info->rtc_regmap, RTC_INT_REG, RTC_INT_RTCA1_I, BIT_IS_ZERO);
if (ret < 0) {
dev_err(info->dev, "RTC register set failed: %d\n", ret);
return ret;
}
ret = max77851_rtc_update(info, MAX77851_RTC_WRITE);
out:
return ret;
}
static int max77851_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct max77851_rtc_info *info = dev_get_drvdata(dev);
u8 data[RTC_NR_TIME];
int ret;
ret = max77851_rtc_tm_to_data(&alrm->time, data, info);
if (ret < 0)
return ret;
mutex_lock(&info->lock);
ret = max77851_rtc_stop_alarm(info);
if (ret < 0)
goto out;
ret = _regmap_bulk_write(info,
info->drv_data->map[REG_ALARM1_SEC],
data, ARRAY_SIZE(data));
if (ret < 0) {
dev_err(info->dev, "Fail to write alarm reg(%d)\n", ret);
goto out;
}
ret = max77851_rtc_update(info, MAX77851_RTC_WRITE);
if (ret < 0)
goto out;
if (alrm->enabled)
ret = max77851_rtc_start_alarm(info);
out:
mutex_unlock(&info->lock);
return ret;
}
static int max77851_rtc_alarm_irq_enable(struct device *dev,
unsigned int enabled)
{
struct max77851_rtc_info *info = dev_get_drvdata(dev);
int ret;
mutex_lock(&info->lock);
if (enabled)
ret = max77851_rtc_start_alarm(info);
else
ret = max77851_rtc_stop_alarm(info);
mutex_unlock(&info->lock);
return ret;
}
#if defined(CONFIG_REGMAP_IRQ)
static irqreturn_t max77851_rtc_alarm1_irq(int irq, void *data)
{
struct max77851_rtc_info *info = data;
const unsigned int *map = info->drv_data->map;
unsigned int val;
regmap_read(info->rtc_regmap, map[REG_RTC_INT], &val);
rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
return IRQ_HANDLED;
}
#endif
static const struct rtc_class_ops max77851_rtc_ops = {
.read_time = max77851_rtc_read_time,
.set_time = max77851_rtc_set_time,
.read_alarm = max77851_rtc_read_alarm,
.set_alarm = max77851_rtc_set_alarm,
.alarm_irq_enable = max77851_rtc_alarm_irq_enable,
};
static int max77851_rtc_enable(struct max77851_chip *chip)
{
int ret;
/* RTC Enable */
ret = regmap_update_bits(chip->rmap, RLOGIC_CFG_REG, RLOGIC_CFG_RTC_EN, RLOGIC_CFG_RTC_EN);
if (ret < 0) {
dev_err(chip->dev, "Register set failed: %d\n", ret);
return ret;
}
/* RTC Global Interrupt Unmask */
ret = regmap_update_bits(chip->rmap, TOP_MSK0_REG, TOP_MSK0_RTC_M, BIT_IS_ZERO);
if (ret < 0) {
dev_err(chip->dev, "Global Mask register set failed: %d\n", ret);
return ret;
}
return ret;
}
static int max77851_rtc_init_reg(struct max77851_rtc_info *info)
{
unsigned int access_cntl;
unsigned int mode_cntl;
int ret;
unsigned int val1;
unsigned int val2;
/* Set RTC control register : Binary mode, 24hour mdoe */
access_cntl = BCD_EN_SHIFT | MODEL24_SHIFT;
mode_cntl = MODEL24_SHIFT;
info->rtc_24hr_mode = true;
info->rtc_binary_mode = true;
ret = regmap_read(info->rtc_regmap, info->drv_data->map[REG_RTC_CONTROLM], &val1);
ret = regmap_read(info->rtc_regmap, info->drv_data->map[REG_RTC_CONTROL], &val2);
ret = regmap_write(info->rtc_regmap, info->drv_data->map[REG_RTC_CONTROLM], access_cntl);
if (ret < 0) {
dev_err(info->dev, "RTC register set failed: %d\n", ret);
return ret;
}
ret = regmap_write(info->rtc_regmap, info->drv_data->map[REG_RTC_CONTROL], mode_cntl);
if (ret < 0) {
dev_err(info->dev, "RTC register set failed: %d\n", ret);
return ret;
}
ret = max77851_rtc_update(info, MAX77851_RTC_WRITE);
ret = max77851_rtc_update(info, MAX77851_RTC_READ);
ret = regmap_read(info->rtc_regmap, info->drv_data->map[REG_RTC_CONTROLM], &val1);
ret = regmap_read(info->rtc_regmap, info->drv_data->map[REG_RTC_CONTROL], &val2);
return ret;
}
static const struct regmap_config max77851_rtc_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = RTC_DOMA2_REG,
};
static int max77851_init_rtc_regmap(struct max77851_rtc_info *info)
{
struct device *parent = info->dev->parent;
struct i2c_client *parent_i2c = to_i2c_client(parent);
int ret;
if (info->drv_data->rtc_irq_from_platform) {
struct platform_device *pdev = to_platform_device(info->dev);
info->rtc_irq = platform_get_irq(pdev, 0);
if (info->rtc_irq < 0) {
dev_err(info->dev, "Failed to get rtc interrupts: %d\n", info->rtc_irq);
return info->rtc_irq;
}
} else {
info->rtc_irq = parent_i2c->irq;
dev_info(info->dev, "rtc irq = %d\n", info->rtc_irq);
}
info->regmap = dev_get_regmap(parent, NULL);
if (!info->regmap) {
dev_err(info->dev, "Failed to get rtc regmap\n");
return -ENODEV;
}
if (info->drv_data->rtc_i2c_addr == MAX77851_INVALID_I2C_ADDR) {
info->rtc_regmap = info->regmap;
goto init_rtc_exit;
}
#if defined(CONFIG_I2C)
info->rtc = i2c_new_dummy_device(parent_i2c->adapter,
info->drv_data->rtc_i2c_addr);
if (!info->rtc) {
dev_err(info->dev, "Failed to allocate I2C device for RTC\n");
return -ENODEV;
}
info->rtc_regmap = devm_regmap_init_i2c(info->rtc,
&max77851_rtc_regmap_config);
if (IS_ERR(info->rtc_regmap)) {
ret = PTR_ERR(info->rtc_regmap);
dev_err(info->dev, "Failed to allocate RTC regmap: %d\n", ret);
goto err_unregister_i2c;
}
#endif
init_rtc_exit:
return 0;
#if defined(CONFIG_I2C)
err_unregister_i2c:
if (info->rtc)
i2c_unregister_device(info->rtc);
#endif
return ret;
}
static int max77851_rtc_probe(struct platform_device *pdev)
{
struct max77851_chip *chip = dev_get_drvdata(pdev->dev.parent);
struct max77851_rtc_info *info;
const struct platform_device_id *id = platform_get_device_id(pdev);
struct device_node *np;
int ret;
np = of_get_child_by_name(pdev->dev.parent->of_node, "rtc");
if (np && !of_device_is_available(np))
return -ENODEV;
info = devm_kzalloc(&pdev->dev, sizeof(struct max77851_rtc_info),
GFP_KERNEL);
if (!info)
return -ENOMEM;
mutex_init(&info->lock);
info->dev = &pdev->dev;
info->drv_data = (const struct max77851_rtc_driver_data *)
id->driver_data;
info->shutdown = false;
ret = max77851_init_rtc_regmap(info);
if (ret < 0)
return ret;
platform_set_drvdata(pdev, info);
ret = max77851_rtc_enable(chip);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to enable RTC reg:%d\n", ret);
goto err_rtc;
}
ret = max77851_rtc_update(info, MAX77851_RTC_READ);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to update RTC reg:%d\n", ret);
goto err_rtc;
}
ret = max77851_rtc_init_reg(info);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
goto err_rtc;
}
device_init_wakeup(&pdev->dev, 1);
info->rtc_dev = devm_rtc_device_register(&pdev->dev, id->name,
&max77851_rtc_ops, THIS_MODULE);
if (IS_ERR(info->rtc_dev)) {
ret = PTR_ERR(info->rtc_dev);
dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
if (ret == 0)
ret = -EINVAL;
goto err_rtc;
}
#if defined(CONFIG_REGMAP_IRQ)
info->rtc_alarm1_virq = regmap_irq_get_virq(chip->top_irq_data, MAX77851_IRQ_TOP_RTC);
if (info->rtc_alarm1_virq <= 0) {
ret = -ENXIO;
goto err_rtc;
}
ret = request_threaded_irq(info->rtc_alarm1_virq, NULL, max77851_rtc_alarm1_irq, 0,
"rtc-alarm1", info);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
info->rtc_alarm1_virq, ret);
goto err_rtc;
}
#endif
ret = max77851_rtc_update(info, MAX77851_RTC_WRITE);
ret = max77851_rtc_update(info, MAX77851_RTC_READ);
return 0;
err_rtc:
#if defined(CONFIG_REGMAP_IRQ)
regmap_del_irq_chip(info->rtc_irq, info->rtc_irq_data);
#endif
#if defined(CONFIG_I2C)
if (info->rtc)
i2c_unregister_device(info->rtc);
#endif
return ret;
}
static void max77851_rtc_shutdown(struct platform_device *pdev)
{
struct max77851_rtc_info *info = platform_get_drvdata(pdev);
int ret;
if (!info)
goto mutex_exit;
mutex_lock(&info->lock);
info->shutdown = true;
mutex_unlock(&info->lock);
ret = max77851_rtc_stop_alarm(info);
if (ret < 0)
dev_err(info->dev, "rtc alarm stop failed:%d\n", ret);
mutex_exit:
mutex_destroy(&info->lock);
}
static int max77851_rtc_remove(struct platform_device *pdev)
{
#if defined(CONFIG_REGMAP_IRQ) || defined(CONFIG_I2C)
struct max77851_rtc_info *info = platform_get_drvdata(pdev);
#if defined(CONFIG_REGMAP_IRQ)
free_irq(info->rtc_alarm1_virq, info);
regmap_del_irq_chip(info->rtc_irq, info->rtc_irq_data);
#endif
#if defined(CONFIG_I2C)
if (info->rtc)
i2c_unregister_device(info->rtc);
#endif
#endif
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int max77851_rtc_suspend(struct device *dev)
{
struct max77851_rtc_info *info = dev_get_drvdata(dev);
#if defined(CONFIG_REGMAP_IRQ)
if (device_may_wakeup(dev))
return enable_irq_wake(info->rtc_alarm1_virq);
#endif
regcache_sync(info->rtc_regmap);
return 0;
}
static int max77851_rtc_resume(struct device *dev)
{
#if defined(CONFIG_REGMAP_IRQ)
struct max77851_rtc_info *info = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
return disable_irq_wake(info->rtc_alarm1_virq);
#endif
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(max77851_rtc_pm_ops,
max77851_rtc_suspend, max77851_rtc_resume);
static const struct platform_device_id rtc_id[] = {
{ "max77851-rtc", .driver_data = (kernel_ulong_t)&max77851_drv_data, },
{},
};
MODULE_DEVICE_TABLE(platform, rtc_id);
static struct platform_driver max77851_rtc_driver = {
.driver = {
.name = "max77851-rtc",
.pm = &max77851_rtc_pm_ops,
},
.probe = max77851_rtc_probe,
.shutdown = max77851_rtc_shutdown,
.remove = max77851_rtc_remove,
.id_table = rtc_id,
};
module_platform_driver(max77851_rtc_driver);
MODULE_DESCRIPTION("Maxim MAX77851 RTC driver");
MODULE_AUTHOR("Shubhi Garg<shgarg@nvidia.com>");
MODULE_AUTHOR("Joan Na<Joan.na@maximintegrated.com>");
MODULE_ALIAS("platform:max77851-rtc");
MODULE_LICENSE("GPL");