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linux-stable/drivers/rtc/rtc-s5m.c
Krzysztof Kozlowski 8ae83b6f76 rtc: s5m: Make register configuration per S2MPS device to remove exceptions 
Before updating time and alarm the driver must set appropriate mask in
UDR register. For that purpose the driver uses common register
configuration and a lot of exceptions per device in the code. The
exceptions are not obvious, for example except the change in the logic
sometimes the fields are swapped (WUDR and AUDR between S2MPS14 and
S2MPS15). This leads to quite complicated code.

Try to make it more obvious by:
1. Documenting the UDR masks for devices and operations.
2. Adding fields in register configuration structure for each operation
   (read time, write time and alarm).
3. Splitting the configuration per S2MPS13, S2MPS14 and S2MPS15 thus
   removing exceptions for them.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-01-11 20:21:55 +01:00

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/*
* Copyright (c) 2013-2014 Samsung Electronics Co., Ltd
* http://www.samsung.com
*
* Copyright (C) 2013 Google, Inc
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/bcd.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <linux/mfd/samsung/core.h>
#include <linux/mfd/samsung/irq.h>
#include <linux/mfd/samsung/rtc.h>
#include <linux/mfd/samsung/s2mps14.h>
/*
* Maximum number of retries for checking changes in UDR field
* of S5M_RTC_UDR_CON register (to limit possible endless loop).
*
* After writing to RTC registers (setting time or alarm) read the UDR field
* in S5M_RTC_UDR_CON register. UDR is auto-cleared when data have
* been transferred.
*/
#define UDR_READ_RETRY_CNT 5
/*
* Registers used by the driver which are different between chipsets.
*
* Operations like read time and write alarm/time require updating
* specific fields in UDR register. These fields usually are auto-cleared
* (with some exceptions).
*
* Table of operations per device:
*
* Device | Write time | Read time | Write alarm
* =================================================
* S5M8767 | UDR + TIME | | UDR
* S2MPS11/14 | WUDR | RUDR | WUDR + RUDR
* S2MPS13 | WUDR | RUDR | WUDR + AUDR
* S2MPS15 | WUDR | RUDR | AUDR
*/
struct s5m_rtc_reg_config {
/* Number of registers used for setting time/alarm0/alarm1 */
unsigned int regs_count;
/* First register for time, seconds */
unsigned int time;
/* RTC control register */
unsigned int ctrl;
/* First register for alarm 0, seconds */
unsigned int alarm0;
/* First register for alarm 1, seconds */
unsigned int alarm1;
/*
* Register for update flag (UDR). Typically setting UDR field to 1
* will enable update of time or alarm register. Then it will be
* auto-cleared after successful update.
*/
unsigned int udr_update;
/* Auto-cleared mask in UDR field for writing time and alarm */
unsigned int autoclear_udr_mask;
/*
* Masks in UDR field for time and alarm operations.
* The read time mask can be 0. Rest should not.
*/
unsigned int read_time_udr_mask;
unsigned int write_time_udr_mask;
unsigned int write_alarm_udr_mask;
};
/* Register map for S5M8763 and S5M8767 */
static const struct s5m_rtc_reg_config s5m_rtc_regs = {
.regs_count = 8,
.time = S5M_RTC_SEC,
.ctrl = S5M_ALARM1_CONF,
.alarm0 = S5M_ALARM0_SEC,
.alarm1 = S5M_ALARM1_SEC,
.udr_update = S5M_RTC_UDR_CON,
.autoclear_udr_mask = S5M_RTC_UDR_MASK,
.read_time_udr_mask = 0, /* Not needed */
.write_time_udr_mask = S5M_RTC_UDR_MASK | S5M_RTC_TIME_EN_MASK,
.write_alarm_udr_mask = S5M_RTC_UDR_MASK,
};
/* Register map for S2MPS13 */
static const struct s5m_rtc_reg_config s2mps13_rtc_regs = {
.regs_count = 7,
.time = S2MPS_RTC_SEC,
.ctrl = S2MPS_RTC_CTRL,
.alarm0 = S2MPS_ALARM0_SEC,
.alarm1 = S2MPS_ALARM1_SEC,
.udr_update = S2MPS_RTC_UDR_CON,
.autoclear_udr_mask = S2MPS_RTC_WUDR_MASK,
.read_time_udr_mask = S2MPS_RTC_RUDR_MASK,
.write_time_udr_mask = S2MPS_RTC_WUDR_MASK,
.write_alarm_udr_mask = S2MPS_RTC_WUDR_MASK | S2MPS13_RTC_AUDR_MASK,
};
/* Register map for S2MPS11/14 */
static const struct s5m_rtc_reg_config s2mps14_rtc_regs = {
.regs_count = 7,
.time = S2MPS_RTC_SEC,
.ctrl = S2MPS_RTC_CTRL,
.alarm0 = S2MPS_ALARM0_SEC,
.alarm1 = S2MPS_ALARM1_SEC,
.udr_update = S2MPS_RTC_UDR_CON,
.autoclear_udr_mask = S2MPS_RTC_WUDR_MASK,
.read_time_udr_mask = S2MPS_RTC_RUDR_MASK,
.write_time_udr_mask = S2MPS_RTC_WUDR_MASK,
.write_alarm_udr_mask = S2MPS_RTC_WUDR_MASK | S2MPS_RTC_RUDR_MASK,
};
/*
* Register map for S2MPS15 - in comparison to S2MPS14 the WUDR and AUDR bits
* are swapped.
*/
static const struct s5m_rtc_reg_config s2mps15_rtc_regs = {
.regs_count = 7,
.time = S2MPS_RTC_SEC,
.ctrl = S2MPS_RTC_CTRL,
.alarm0 = S2MPS_ALARM0_SEC,
.alarm1 = S2MPS_ALARM1_SEC,
.udr_update = S2MPS_RTC_UDR_CON,
.autoclear_udr_mask = S2MPS_RTC_WUDR_MASK,
.read_time_udr_mask = S2MPS_RTC_RUDR_MASK,
.write_time_udr_mask = S2MPS15_RTC_WUDR_MASK,
.write_alarm_udr_mask = S2MPS15_RTC_AUDR_MASK,
};
struct s5m_rtc_info {
struct device *dev;
struct i2c_client *i2c;
struct sec_pmic_dev *s5m87xx;
struct regmap *regmap;
struct rtc_device *rtc_dev;
int irq;
enum sec_device_type device_type;
int rtc_24hr_mode;
const struct s5m_rtc_reg_config *regs;
};
static const struct regmap_config s5m_rtc_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = S5M_RTC_REG_MAX,
};
static const struct regmap_config s2mps14_rtc_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = S2MPS_RTC_REG_MAX,
};
static void s5m8767_data_to_tm(u8 *data, struct rtc_time *tm,
int rtc_24hr_mode)
{
tm->tm_sec = data[RTC_SEC] & 0x7f;
tm->tm_min = data[RTC_MIN] & 0x7f;
if (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] & 0x7f);
tm->tm_mday = data[RTC_DATE] & 0x1f;
tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
tm->tm_year = (data[RTC_YEAR1] & 0x7f) + 100;
tm->tm_yday = 0;
tm->tm_isdst = 0;
}
static int s5m8767_tm_to_data(struct rtc_time *tm, u8 *data)
{
data[RTC_SEC] = tm->tm_sec;
data[RTC_MIN] = tm->tm_min;
if (tm->tm_hour >= 12)
data[RTC_HOUR] = tm->tm_hour | HOUR_PM_MASK;
else
data[RTC_HOUR] = tm->tm_hour & ~HOUR_PM_MASK;
data[RTC_WEEKDAY] = 1 << tm->tm_wday;
data[RTC_DATE] = tm->tm_mday;
data[RTC_MONTH] = tm->tm_mon + 1;
data[RTC_YEAR1] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
if (tm->tm_year < 100) {
pr_err("RTC cannot handle the year %d\n",
1900 + tm->tm_year);
return -EINVAL;
} else {
return 0;
}
}
/*
* Read RTC_UDR_CON register and wait till UDR field is cleared.
* This indicates that time/alarm update ended.
*/
static inline int s5m8767_wait_for_udr_update(struct s5m_rtc_info *info)
{
int ret, retry = UDR_READ_RETRY_CNT;
unsigned int data;
do {
ret = regmap_read(info->regmap, info->regs->udr_update, &data);
} while (--retry && (data & info->regs->autoclear_udr_mask) && !ret);
if (!retry)
dev_err(info->dev, "waiting for UDR update, reached max number of retries\n");
return ret;
}
static inline int s5m_check_peding_alarm_interrupt(struct s5m_rtc_info *info,
struct rtc_wkalrm *alarm)
{
int ret;
unsigned int val;
switch (info->device_type) {
case S5M8767X:
case S5M8763X:
ret = regmap_read(info->regmap, S5M_RTC_STATUS, &val);
val &= S5M_ALARM0_STATUS;
break;
case S2MPS15X:
case S2MPS14X:
case S2MPS13X:
ret = regmap_read(info->s5m87xx->regmap_pmic, S2MPS14_REG_ST2,
&val);
val &= S2MPS_ALARM0_STATUS;
break;
default:
return -EINVAL;
}
if (ret < 0)
return ret;
if (val)
alarm->pending = 1;
else
alarm->pending = 0;
return 0;
}
static inline int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
{
int ret;
unsigned int data;
ret = regmap_read(info->regmap, info->regs->udr_update, &data);
if (ret < 0) {
dev_err(info->dev, "failed to read update reg(%d)\n", ret);
return ret;
}
data |= info->regs->write_time_udr_mask;
ret = regmap_write(info->regmap, info->regs->udr_update, data);
if (ret < 0) {
dev_err(info->dev, "failed to write update reg(%d)\n", ret);
return ret;
}
ret = s5m8767_wait_for_udr_update(info);
return ret;
}
static inline int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
{
int ret;
unsigned int data;
ret = regmap_read(info->regmap, info->regs->udr_update, &data);
if (ret < 0) {
dev_err(info->dev, "%s: fail to read update reg(%d)\n",
__func__, ret);
return ret;
}
data |= info->regs->write_alarm_udr_mask;
switch (info->device_type) {
case S5M8763X:
case S5M8767X:
data &= ~S5M_RTC_TIME_EN_MASK;
break;
case S2MPS15X:
case S2MPS14X:
case S2MPS13X:
/* No exceptions needed */
break;
default:
return -EINVAL;
}
ret = regmap_write(info->regmap, info->regs->udr_update, data);
if (ret < 0) {
dev_err(info->dev, "%s: fail to write update reg(%d)\n",
__func__, ret);
return ret;
}
ret = s5m8767_wait_for_udr_update(info);
/* On S2MPS13 the AUDR is not auto-cleared */
if (info->device_type == S2MPS13X)
regmap_update_bits(info->regmap, info->regs->udr_update,
S2MPS13_RTC_AUDR_MASK, 0);
return ret;
}
static void s5m8763_data_to_tm(u8 *data, struct rtc_time *tm)
{
tm->tm_sec = bcd2bin(data[RTC_SEC]);
tm->tm_min = bcd2bin(data[RTC_MIN]);
if (data[RTC_HOUR] & HOUR_12) {
tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f);
if (data[RTC_HOUR] & HOUR_PM)
tm->tm_hour += 12;
} else {
tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
}
tm->tm_wday = data[RTC_WEEKDAY] & 0x07;
tm->tm_mday = bcd2bin(data[RTC_DATE]);
tm->tm_mon = bcd2bin(data[RTC_MONTH]);
tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100;
tm->tm_year -= 1900;
}
static void s5m8763_tm_to_data(struct rtc_time *tm, u8 *data)
{
data[RTC_SEC] = bin2bcd(tm->tm_sec);
data[RTC_MIN] = bin2bcd(tm->tm_min);
data[RTC_HOUR] = bin2bcd(tm->tm_hour);
data[RTC_WEEKDAY] = tm->tm_wday;
data[RTC_DATE] = bin2bcd(tm->tm_mday);
data[RTC_MONTH] = bin2bcd(tm->tm_mon);
data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100);
data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);
}
static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct s5m_rtc_info *info = dev_get_drvdata(dev);
u8 data[info->regs->regs_count];
int ret;
if (info->regs->read_time_udr_mask) {
ret = regmap_update_bits(info->regmap,
info->regs->udr_update,
info->regs->read_time_udr_mask,
info->regs->read_time_udr_mask);
if (ret) {
dev_err(dev,
"Failed to prepare registers for time reading: %d\n",
ret);
return ret;
}
}
ret = regmap_bulk_read(info->regmap, info->regs->time, data,
info->regs->regs_count);
if (ret < 0)
return ret;
switch (info->device_type) {
case S5M8763X:
s5m8763_data_to_tm(data, tm);
break;
case S5M8767X:
case S2MPS15X:
case S2MPS14X:
case S2MPS13X:
s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode);
break;
default:
return -EINVAL;
}
dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
return rtc_valid_tm(tm);
}
static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct s5m_rtc_info *info = dev_get_drvdata(dev);
u8 data[info->regs->regs_count];
int ret = 0;
switch (info->device_type) {
case S5M8763X:
s5m8763_tm_to_data(tm, data);
break;
case S5M8767X:
case S2MPS15X:
case S2MPS14X:
case S2MPS13X:
ret = s5m8767_tm_to_data(tm, data);
break;
default:
return -EINVAL;
}
if (ret < 0)
return ret;
dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
ret = regmap_raw_write(info->regmap, info->regs->time, data,
info->regs->regs_count);
if (ret < 0)
return ret;
ret = s5m8767_rtc_set_time_reg(info);
return ret;
}
static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct s5m_rtc_info *info = dev_get_drvdata(dev);
u8 data[info->regs->regs_count];
unsigned int val;
int ret, i;
ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
info->regs->regs_count);
if (ret < 0)
return ret;
switch (info->device_type) {
case S5M8763X:
s5m8763_data_to_tm(data, &alrm->time);
ret = regmap_read(info->regmap, S5M_ALARM0_CONF, &val);
if (ret < 0)
return ret;
alrm->enabled = !!val;
break;
case S5M8767X:
case S2MPS15X:
case S2MPS14X:
case S2MPS13X:
s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
alrm->enabled = 0;
for (i = 0; i < info->regs->regs_count; i++) {
if (data[i] & ALARM_ENABLE_MASK) {
alrm->enabled = 1;
break;
}
}
break;
default:
return -EINVAL;
}
dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
alrm->time.tm_mday, alrm->time.tm_hour,
alrm->time.tm_min, alrm->time.tm_sec,
alrm->time.tm_wday);
ret = s5m_check_peding_alarm_interrupt(info, alrm);
return 0;
}
static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
{
u8 data[info->regs->regs_count];
int ret, i;
struct rtc_time tm;
ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
info->regs->regs_count);
if (ret < 0)
return ret;
s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
switch (info->device_type) {
case S5M8763X:
ret = regmap_write(info->regmap, S5M_ALARM0_CONF, 0);
break;
case S5M8767X:
case S2MPS15X:
case S2MPS14X:
case S2MPS13X:
for (i = 0; i < info->regs->regs_count; i++)
data[i] &= ~ALARM_ENABLE_MASK;
ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
info->regs->regs_count);
if (ret < 0)
return ret;
ret = s5m8767_rtc_set_alarm_reg(info);
break;
default:
return -EINVAL;
}
return ret;
}
static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
{
int ret;
u8 data[info->regs->regs_count];
u8 alarm0_conf;
struct rtc_time tm;
ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
info->regs->regs_count);
if (ret < 0)
return ret;
s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
switch (info->device_type) {
case S5M8763X:
alarm0_conf = 0x77;
ret = regmap_write(info->regmap, S5M_ALARM0_CONF, alarm0_conf);
break;
case S5M8767X:
case S2MPS15X:
case S2MPS14X:
case S2MPS13X:
data[RTC_SEC] |= ALARM_ENABLE_MASK;
data[RTC_MIN] |= ALARM_ENABLE_MASK;
data[RTC_HOUR] |= ALARM_ENABLE_MASK;
data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
if (data[RTC_DATE] & 0x1f)
data[RTC_DATE] |= ALARM_ENABLE_MASK;
if (data[RTC_MONTH] & 0xf)
data[RTC_MONTH] |= ALARM_ENABLE_MASK;
if (data[RTC_YEAR1] & 0x7f)
data[RTC_YEAR1] |= ALARM_ENABLE_MASK;
ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
info->regs->regs_count);
if (ret < 0)
return ret;
ret = s5m8767_rtc_set_alarm_reg(info);
break;
default:
return -EINVAL;
}
return ret;
}
static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct s5m_rtc_info *info = dev_get_drvdata(dev);
u8 data[info->regs->regs_count];
int ret;
switch (info->device_type) {
case S5M8763X:
s5m8763_tm_to_data(&alrm->time, data);
break;
case S5M8767X:
case S2MPS15X:
case S2MPS14X:
case S2MPS13X:
s5m8767_tm_to_data(&alrm->time, data);
break;
default:
return -EINVAL;
}
dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
alrm->time.tm_mday, alrm->time.tm_hour, alrm->time.tm_min,
alrm->time.tm_sec, alrm->time.tm_wday);
ret = s5m_rtc_stop_alarm(info);
if (ret < 0)
return ret;
ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
info->regs->regs_count);
if (ret < 0)
return ret;
ret = s5m8767_rtc_set_alarm_reg(info);
if (ret < 0)
return ret;
if (alrm->enabled)
ret = s5m_rtc_start_alarm(info);
return ret;
}
static int s5m_rtc_alarm_irq_enable(struct device *dev,
unsigned int enabled)
{
struct s5m_rtc_info *info = dev_get_drvdata(dev);
if (enabled)
return s5m_rtc_start_alarm(info);
else
return s5m_rtc_stop_alarm(info);
}
static irqreturn_t s5m_rtc_alarm_irq(int irq, void *data)
{
struct s5m_rtc_info *info = data;
rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
return IRQ_HANDLED;
}
static const struct rtc_class_ops s5m_rtc_ops = {
.read_time = s5m_rtc_read_time,
.set_time = s5m_rtc_set_time,
.read_alarm = s5m_rtc_read_alarm,
.set_alarm = s5m_rtc_set_alarm,
.alarm_irq_enable = s5m_rtc_alarm_irq_enable,
};
static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
{
u8 data[2];
int ret;
switch (info->device_type) {
case S5M8763X:
case S5M8767X:
/* UDR update time. Default of 7.32 ms is too long. */
ret = regmap_update_bits(info->regmap, S5M_RTC_UDR_CON,
S5M_RTC_UDR_T_MASK, S5M_RTC_UDR_T_450_US);
if (ret < 0)
dev_err(info->dev, "%s: fail to change UDR time: %d\n",
__func__, ret);
/* Set RTC control register : Binary mode, 24hour mode */
data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
ret = regmap_raw_write(info->regmap, S5M_ALARM0_CONF, data, 2);
break;
case S2MPS15X:
case S2MPS14X:
case S2MPS13X:
data[0] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
ret = regmap_write(info->regmap, info->regs->ctrl, data[0]);
if (ret < 0)
break;
/*
* Should set WUDR & (RUDR or AUDR) bits to high after writing
* RTC_CTRL register like writing Alarm registers. We can't find
* the description from datasheet but vendor code does that
* really.
*/
ret = s5m8767_rtc_set_alarm_reg(info);
break;
default:
return -EINVAL;
}
info->rtc_24hr_mode = 1;
if (ret < 0) {
dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
__func__, ret);
return ret;
}
return ret;
}
static int s5m_rtc_probe(struct platform_device *pdev)
{
struct sec_pmic_dev *s5m87xx = dev_get_drvdata(pdev->dev.parent);
struct sec_platform_data *pdata = s5m87xx->pdata;
struct s5m_rtc_info *info;
const struct regmap_config *regmap_cfg;
int ret, alarm_irq;
if (!pdata) {
dev_err(pdev->dev.parent, "Platform data not supplied\n");
return -ENODEV;
}
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
switch (platform_get_device_id(pdev)->driver_data) {
case S2MPS15X:
regmap_cfg = &s2mps14_rtc_regmap_config;
info->regs = &s2mps15_rtc_regs;
alarm_irq = S2MPS14_IRQ_RTCA0;
break;
case S2MPS14X:
regmap_cfg = &s2mps14_rtc_regmap_config;
info->regs = &s2mps14_rtc_regs;
alarm_irq = S2MPS14_IRQ_RTCA0;
break;
case S2MPS13X:
regmap_cfg = &s2mps14_rtc_regmap_config;
info->regs = &s2mps13_rtc_regs;
alarm_irq = S2MPS14_IRQ_RTCA0;
break;
case S5M8763X:
regmap_cfg = &s5m_rtc_regmap_config;
info->regs = &s5m_rtc_regs;
alarm_irq = S5M8763_IRQ_ALARM0;
break;
case S5M8767X:
regmap_cfg = &s5m_rtc_regmap_config;
info->regs = &s5m_rtc_regs;
alarm_irq = S5M8767_IRQ_RTCA1;
break;
default:
dev_err(&pdev->dev,
"Device type %lu is not supported by RTC driver\n",
platform_get_device_id(pdev)->driver_data);
return -ENODEV;
}
info->i2c = i2c_new_dummy(s5m87xx->i2c->adapter, RTC_I2C_ADDR);
if (!info->i2c) {
dev_err(&pdev->dev, "Failed to allocate I2C for RTC\n");
return -ENODEV;
}
info->regmap = devm_regmap_init_i2c(info->i2c, regmap_cfg);
if (IS_ERR(info->regmap)) {
ret = PTR_ERR(info->regmap);
dev_err(&pdev->dev, "Failed to allocate RTC register map: %d\n",
ret);
goto err;
}
info->dev = &pdev->dev;
info->s5m87xx = s5m87xx;
info->device_type = platform_get_device_id(pdev)->driver_data;
if (s5m87xx->irq_data) {
info->irq = regmap_irq_get_virq(s5m87xx->irq_data, alarm_irq);
if (info->irq <= 0) {
ret = -EINVAL;
dev_err(&pdev->dev, "Failed to get virtual IRQ %d\n",
alarm_irq);
goto err;
}
}
platform_set_drvdata(pdev, info);
ret = s5m8767_rtc_init_reg(info);
device_init_wakeup(&pdev->dev, 1);
info->rtc_dev = devm_rtc_device_register(&pdev->dev, "s5m-rtc",
&s5m_rtc_ops, THIS_MODULE);
if (IS_ERR(info->rtc_dev)) {
ret = PTR_ERR(info->rtc_dev);
goto err;
}
if (!info->irq) {
dev_info(&pdev->dev, "Alarm IRQ not available\n");
return 0;
}
ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
s5m_rtc_alarm_irq, 0, "rtc-alarm0",
info);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
info->irq, ret);
goto err;
}
return 0;
err:
i2c_unregister_device(info->i2c);
return ret;
}
static int s5m_rtc_remove(struct platform_device *pdev)
{
struct s5m_rtc_info *info = platform_get_drvdata(pdev);
i2c_unregister_device(info->i2c);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int s5m_rtc_resume(struct device *dev)
{
struct s5m_rtc_info *info = dev_get_drvdata(dev);
int ret = 0;
if (info->irq && device_may_wakeup(dev))
ret = disable_irq_wake(info->irq);
return ret;
}
static int s5m_rtc_suspend(struct device *dev)
{
struct s5m_rtc_info *info = dev_get_drvdata(dev);
int ret = 0;
if (info->irq && device_may_wakeup(dev))
ret = enable_irq_wake(info->irq);
return ret;
}
#endif /* CONFIG_PM_SLEEP */
static SIMPLE_DEV_PM_OPS(s5m_rtc_pm_ops, s5m_rtc_suspend, s5m_rtc_resume);
static const struct platform_device_id s5m_rtc_id[] = {
{ "s5m-rtc", S5M8767X },
{ "s2mps13-rtc", S2MPS13X },
{ "s2mps14-rtc", S2MPS14X },
{ "s2mps15-rtc", S2MPS15X },
{ },
};
MODULE_DEVICE_TABLE(platform, s5m_rtc_id);
static struct platform_driver s5m_rtc_driver = {
.driver = {
.name = "s5m-rtc",
.pm = &s5m_rtc_pm_ops,
},
.probe = s5m_rtc_probe,
.remove = s5m_rtc_remove,
.id_table = s5m_rtc_id,
};
module_platform_driver(s5m_rtc_driver);
/* Module information */
MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
MODULE_DESCRIPTION("Samsung S5M/S2MPS14 RTC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:s5m-rtc");
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