[PATCH 5/8] rtc: max77686: Add max77802 support
From: Javier Martinez Canillas
Date: Wed Jan 20 2016 - 12:16:07 EST
The MAX77686 and MAX77802 RTC IP blocks are very similar with only
these differences:
0) The RTC registers layout and addresses are different.
1) The MAX77686 use 1 bit of the sec/min/hour/etc registers as the
alarm enable while MAX77802 has a separate register for that.
2) The MAX77686 RTCYEAR register valid values range is 0..99 while
for MAX77802 is 0..199.
3) The MAX77686 has a separate I2C address for the RTC registers
while the MAX77802 uses the same I2C address as the PMIC regs.
5) They minium delay before a RTC update (16ms vs 200 usecs).
There are separate drivers for MAX77686 and MAX77802 RTC IP blocks
but the differences are not that big so the driver can be extended
to support both instead of duplicating a lot of code in 2 drivers.
Suggested-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Signed-off-by: Javier Martinez Canillas <javier@xxxxxxxxxxxxxxx>
---
drivers/rtc/rtc-max77686.c | 176 ++++++++++++++++++++++++++++++++-------------
1 file changed, 128 insertions(+), 48 deletions(-)
diff --git a/drivers/rtc/rtc-max77686.c b/drivers/rtc/rtc-max77686.c
index 7316e41820c7..7a144e7ecd27 100644
--- a/drivers/rtc/rtc-max77686.c
+++ b/drivers/rtc/rtc-max77686.c
@@ -1,5 +1,5 @@
/*
- * RTC driver for Maxim MAX77686
+ * RTC driver for Maxim MAX77686 and MAX77802
*
* Copyright (C) 2012 Samsung Electronics Co.Ltd
*
@@ -43,6 +43,13 @@
#define REG_RTC_NONE 0xdeadbeef
+/*
+ * MAX77802 has separate register (RTCAE1) for alarm enable instead
+ * using 1 bit from registers RTC{SEC,MIN,HOUR,DAY,MONTH,YEAR,DATE}
+ * as in done in MAX77686.
+ */
+#define ALARM_ENABLE_VALUE 0x77
+
enum {
RTC_SEC = 0,
RTC_MIN,
@@ -58,6 +65,10 @@ struct rtc_driver_data {
unsigned long delay;
int mask;
const unsigned int *map;
+ /* Has a separate alarm enable register? */
+ bool rtcae;
+ /* Has a separate I2C regmap for the RTC? */
+ bool rtcrm;
};
struct max77686_rtc_info {
@@ -108,6 +119,8 @@ enum rtc_reg {
REG_ALARM2_MONTH,
REG_ALARM2_YEAR,
REG_ALARM2_DATE,
+ REG_RTC_AE1,
+ REG_RTC_AE2,
REG_RTC_END,
};
@@ -120,13 +133,36 @@ static const unsigned int max77686_map[REG_RTC_END] = {
MAX77686_ALARM1_WEEKDAY, MAX77686_ALARM1_MONTH, MAX77686_ALARM1_YEAR,
MAX77686_ALARM1_DATE, MAX77686_ALARM2_SEC, MAX77686_ALARM2_MIN,
MAX77686_ALARM2_HOUR, MAX77686_ALARM2_WEEKDAY, MAX77686_ALARM2_MONTH,
- MAX77686_ALARM2_YEAR, MAX77686_ALARM2_DATE,
+ MAX77686_ALARM2_YEAR, MAX77686_ALARM2_DATE, REG_RTC_NONE, REG_RTC_NONE,
};
static const struct rtc_driver_data max77686_drv_data = {
.delay = 1600,
.mask = 0x7f,
.map = max77686_map,
+ .rtcae = false,
+ .rtcrm = true,
+};
+
+static const unsigned int max77802_map[REG_RTC_END] = {
+ MAX77802_RTC_CONTROLM, MAX77802_RTC_CONTROL, MAX77802_RTC_UPDATE0,
+ REG_RTC_NONE, MAX77802_WTSR_SMPL_CNTL, MAX77802_RTC_SEC,
+ MAX77802_RTC_MIN, MAX77802_RTC_HOUR, MAX77802_RTC_WEEKDAY,
+ MAX77802_RTC_MONTH, MAX77802_RTC_YEAR, MAX77802_RTC_DATE,
+ MAX77802_ALARM1_SEC, MAX77802_ALARM1_MIN, MAX77802_ALARM1_HOUR,
+ MAX77686_ALARM1_WEEKDAY, MAX77802_ALARM1_MONTH, MAX77802_ALARM1_YEAR,
+ MAX77802_ALARM1_DATE, MAX77802_ALARM1_SEC, MAX77802_ALARM1_MIN,
+ MAX77802_ALARM1_HOUR, MAX77802_ALARM1_WEEKDAY, MAX77802_ALARM1_MONTH,
+ MAX77802_ALARM1_YEAR, MAX77802_ALARM1_DATE, MAX77802_RTC_AE1,
+ MAX77802_RTC_AE2,
+};
+
+static const struct rtc_driver_data max77802_drv_data = {
+ .delay = 200,
+ .mask = 0xff,
+ .map = max77802_map,
+ .rtcae = true,
+ .rtcrm = false,
};
static void max77686_rtc_data_to_tm(u8 *data, struct rtc_time *tm,
@@ -148,12 +184,20 @@ static void max77686_rtc_data_to_tm(u8 *data, struct rtc_time *tm,
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_year = data[RTC_YEAR] & mask;
tm->tm_yday = 0;
tm->tm_isdst = 0;
+
+ /*
+ * MAX77686 uses 1 bit from sec/min/hour/etc RTC registers and the
+ * year values are just 0..99 so add 100 to support up to 2099.
+ */
+ if (!info->drv_data->rtcae)
+ tm->tm_year += 100;
}
-static int max77686_rtc_tm_to_data(struct rtc_time *tm, u8 *data)
+static int max77686_rtc_tm_to_data(struct rtc_time *tm, u8 *data,
+ struct max77686_rtc_info *info)
{
data[RTC_SEC] = tm->tm_sec;
data[RTC_MIN] = tm->tm_min;
@@ -161,13 +205,19 @@ static int max77686_rtc_tm_to_data(struct rtc_time *tm, u8 *data)
data[RTC_WEEKDAY] = 1 << tm->tm_wday;
data[RTC_DATE] = tm->tm_mday;
data[RTC_MONTH] = tm->tm_mon + 1;
- data[RTC_YEAR] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
- if (tm->tm_year < 100) {
- pr_warn("RTC cannot handle the year %d. Assume it's 2000.\n",
- 1900 + tm->tm_year);
- return -EINVAL;
+ if (!info->drv_data->rtcae) {
+ data[RTC_YEAR] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
+
+ if (tm->tm_year < 100) {
+ pr_warn("RTC can't handle year %d. Assume it's 2000.\n",
+ 1900 + tm->tm_year);
+ return -EINVAL;
+ }
+ } else {
+ data[RTC_YEAR] = tm->tm_year;
}
+
return 0;
}
@@ -232,7 +282,7 @@ static int max77686_rtc_set_time(struct device *dev, struct rtc_time *tm)
u8 data[RTC_NR_TIME];
int ret;
- ret = max77686_rtc_tm_to_data(tm, data);
+ ret = max77686_rtc_tm_to_data(tm, data, info);
if (ret < 0)
return ret;
@@ -279,11 +329,24 @@ static int max77686_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
max77686_rtc_data_to_tm(data, &alrm->time, info);
alrm->enabled = 0;
- for (i = 0; i < RTC_NR_TIME; i++) {
- if (data[i] & ALARM_ENABLE_MASK) {
- alrm->enabled = 1;
- break;
+
+ if (!info->drv_data->rtcae) {
+ for (i = 0; i < RTC_NR_TIME; i++) {
+ if (data[i] & ALARM_ENABLE_MASK) {
+ alrm->enabled = 1;
+ break;
+ }
}
+ } else {
+ ret = regmap_read(info->max77686->regmap,
+ map[REG_RTC_AE1], &val);
+ if (ret < 0) {
+ dev_err(info->dev, "%s:%d fail to read alarm enable(%d)\n",
+ __func__, __LINE__, ret);
+ goto out;
+ }
+ if (val)
+ alrm->enabled = 1;
}
alrm->pending = 0;
@@ -316,21 +379,27 @@ static int max77686_rtc_stop_alarm(struct max77686_rtc_info *info)
if (ret < 0)
goto out;
- ret = regmap_bulk_read(info->max77686->rtc_regmap,
- map[REG_ALARM1_SEC], data, RTC_NR_TIME);
- if (ret < 0) {
- dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
+ if (!info->drv_data->rtcae) {
+ ret = regmap_bulk_read(info->max77686->rtc_regmap,
+ map[REG_ALARM1_SEC], data, RTC_NR_TIME);
+ if (ret < 0) {
+ dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
__func__, ret);
- goto out;
- }
+ goto out;
+ }
- max77686_rtc_data_to_tm(data, &tm, info);
+ max77686_rtc_data_to_tm(data, &tm, info);
- for (i = 0; i < RTC_NR_TIME; i++)
- data[i] &= ~ALARM_ENABLE_MASK;
+ for (i = 0; i < RTC_NR_TIME; i++)
+ data[i] &= ~ALARM_ENABLE_MASK;
+
+ ret = regmap_bulk_write(info->max77686->rtc_regmap,
+ map[REG_ALARM1_SEC], data, RTC_NR_TIME);
+ } else {
+ ret = regmap_write(info->max77686->regmap,
+ map[REG_RTC_AE1], 0);
+ }
- ret = regmap_bulk_write(info->max77686->rtc_regmap,
- map[REG_ALARM1_SEC], data, RTC_NR_TIME);
if (ret < 0) {
dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
__func__, ret);
@@ -356,29 +425,35 @@ static int max77686_rtc_start_alarm(struct max77686_rtc_info *info)
if (ret < 0)
goto out;
- ret = regmap_bulk_read(info->max77686->rtc_regmap,
- map[REG_ALARM1_SEC], data, RTC_NR_TIME);
- if (ret < 0) {
- dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
+ if (!info->drv_data->rtcae) {
+ ret = regmap_bulk_read(info->max77686->rtc_regmap,
+ map[REG_ALARM1_SEC], data, RTC_NR_TIME);
+ if (ret < 0) {
+ dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
__func__, ret);
- goto out;
- }
-
- max77686_rtc_data_to_tm(data, &tm, info);
+ goto out;
+ }
- data[RTC_SEC] |= (1 << ALARM_ENABLE_SHIFT);
- data[RTC_MIN] |= (1 << ALARM_ENABLE_SHIFT);
- data[RTC_HOUR] |= (1 << ALARM_ENABLE_SHIFT);
- data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
- if (data[RTC_MONTH] & 0xf)
- data[RTC_MONTH] |= (1 << ALARM_ENABLE_SHIFT);
- if (data[RTC_YEAR] & info->drv_data->mask)
- data[RTC_YEAR] |= (1 << ALARM_ENABLE_SHIFT);
- if (data[RTC_DATE] & 0x1f)
- data[RTC_DATE] |= (1 << ALARM_ENABLE_SHIFT);
+ max77686_rtc_data_to_tm(data, &tm, info);
+
+ data[RTC_SEC] |= (1 << ALARM_ENABLE_SHIFT);
+ data[RTC_MIN] |= (1 << ALARM_ENABLE_SHIFT);
+ data[RTC_HOUR] |= (1 << ALARM_ENABLE_SHIFT);
+ data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
+ if (data[RTC_MONTH] & 0xf)
+ data[RTC_MONTH] |= (1 << ALARM_ENABLE_SHIFT);
+ if (data[RTC_YEAR] & info->drv_data->mask)
+ data[RTC_YEAR] |= (1 << ALARM_ENABLE_SHIFT);
+ if (data[RTC_DATE] & 0x1f)
+ data[RTC_DATE] |= (1 << ALARM_ENABLE_SHIFT);
+
+ ret = regmap_bulk_write(info->max77686->rtc_regmap,
+ map[REG_ALARM1_SEC], data, RTC_NR_TIME);
+ } else {
+ ret = regmap_write(info->max77686->regmap,
+ map[REG_RTC_AE1], ALARM_ENABLE_VALUE);
+ }
- ret = regmap_bulk_write(info->max77686->rtc_regmap,
- map[REG_ALARM1_SEC], data, RTC_NR_TIME);
if (ret < 0) {
dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
__func__, ret);
@@ -396,7 +471,7 @@ static int max77686_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
u8 data[RTC_NR_TIME];
int ret;
- ret = max77686_rtc_tm_to_data(&alrm->time, data);
+ ret = max77686_rtc_tm_to_data(&alrm->time, data, info);
if (ret < 0)
return ret;
@@ -490,6 +565,7 @@ static int max77686_rtc_probe(struct platform_device *pdev)
{
struct max77686_dev *max77686 = dev_get_drvdata(pdev->dev.parent);
struct max77686_rtc_info *info;
+ const struct platform_device_id *id = pdev->id_entry;
int ret;
dev_info(&pdev->dev, "%s\n", __func__);
@@ -503,7 +579,10 @@ static int max77686_rtc_probe(struct platform_device *pdev)
info->dev = &pdev->dev;
info->max77686 = max77686;
info->rtc = max77686->rtc;
- info->drv_data = (struct rtc_driver_data *)pdev->id_entry->driver_data;
+ info->drv_data = (struct rtc_driver_data *)id->driver_data;
+
+ if (!info->drv_data->rtcrm)
+ info->max77686->rtc_regmap = info->max77686->regmap;
platform_set_drvdata(pdev, info);
@@ -516,7 +595,7 @@ static int max77686_rtc_probe(struct platform_device *pdev)
device_init_wakeup(&pdev->dev, 1);
- info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max77686-rtc",
+ info->rtc_dev = devm_rtc_device_register(&pdev->dev, id->name,
&max77686_rtc_ops, THIS_MODULE);
if (IS_ERR(info->rtc_dev)) {
@@ -579,6 +658,7 @@ static SIMPLE_DEV_PM_OPS(max77686_rtc_pm_ops,
static const struct platform_device_id rtc_id[] = {
{ "max77686-rtc", .driver_data = (kernel_ulong_t)&max77686_drv_data, },
+ { "max77802-rtc", .driver_data = (kernel_ulong_t)&max77802_drv_data, },
{},
};
MODULE_DEVICE_TABLE(platform, rtc_id);
--
2.5.0