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-rw-r--r--drivers/rtc/rtc-ds1307.c73
1 files changed, 27 insertions, 46 deletions
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 9b4106a7e8e4..922675281b7a 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -136,6 +136,9 @@ struct chip_desc {
unsigned alarm:1;
u16 nvram_offset;
u16 nvram_size;
+ u8 century_reg;
+ u8 century_enable_bit;
+ u8 century_bit;
u16 trickle_charger_reg;
u8 trickle_charger_setup;
u8 (*do_trickle_setup)(struct ds1307 *, uint32_t,
@@ -151,6 +154,8 @@ static struct chip_desc chips[last_ds_type] = {
},
[ds_1337] = {
.alarm = 1,
+ .century_reg = DS1307_REG_MONTH,
+ .century_bit = DS1337_BIT_CENTURY,
},
[ds_1338] = {
.nvram_offset = 8,
@@ -158,10 +163,15 @@ static struct chip_desc chips[last_ds_type] = {
},
[ds_1339] = {
.alarm = 1,
+ .century_reg = DS1307_REG_MONTH,
+ .century_bit = DS1337_BIT_CENTURY,
.trickle_charger_reg = 0x10,
.do_trickle_setup = &do_trickle_setup_ds1339,
},
[ds_1340] = {
+ .century_reg = DS1307_REG_HOUR,
+ .century_enable_bit = DS1340_BIT_CENTURY_EN,
+ .century_bit = DS1340_BIT_CENTURY,
.trickle_charger_reg = 0x08,
},
[ds_1388] = {
@@ -169,6 +179,8 @@ static struct chip_desc chips[last_ds_type] = {
},
[ds_3231] = {
.alarm = 1,
+ .century_reg = DS1307_REG_MONTH,
+ .century_bit = DS1337_BIT_CENTURY,
},
[rx_8130] = {
.alarm = 1,
@@ -328,6 +340,7 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t)
{
struct ds1307 *ds1307 = dev_get_drvdata(dev);
int tmp, ret;
+ const struct chip_desc *chip = &chips[ds1307->type];
/* read the RTC date and time registers all at once */
ret = regmap_bulk_read(ds1307->regmap, ds1307->offset, ds1307->regs, 7);
@@ -355,22 +368,9 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t)
t->tm_mon = bcd2bin(tmp) - 1;
t->tm_year = bcd2bin(ds1307->regs[DS1307_REG_YEAR]) + 100;
-#ifdef CONFIG_RTC_DRV_DS1307_CENTURY
- switch (ds1307->type) {
- case ds_1337:
- case ds_1339:
- case ds_3231:
- if (ds1307->regs[DS1307_REG_MONTH] & DS1337_BIT_CENTURY)
- t->tm_year += 100;
- break;
- case ds_1340:
- if (ds1307->regs[DS1307_REG_HOUR] & DS1340_BIT_CENTURY)
- t->tm_year += 100;
- break;
- default:
- break;
- }
-#endif
+ if (ds1307->regs[chip->century_reg] & chip->century_bit &&
+ IS_ENABLED(CONFIG_RTC_DRV_DS1307_CENTURY))
+ t->tm_year += 100;
dev_dbg(dev, "%s secs=%d, mins=%d, "
"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
@@ -385,6 +385,7 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t)
static int ds1307_set_time(struct device *dev, struct rtc_time *t)
{
struct ds1307 *ds1307 = dev_get_drvdata(dev);
+ const struct chip_desc *chip = &chips[ds1307->type];
int result;
int tmp;
u8 *buf = ds1307->regs;
@@ -395,24 +396,14 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
t->tm_hour, t->tm_mday,
t->tm_mon, t->tm_year, t->tm_wday);
-#ifdef CONFIG_RTC_DRV_DS1307_CENTURY
if (t->tm_year < 100)
return -EINVAL;
- switch (ds1307->type) {
- case ds_1337:
- case ds_1339:
- case ds_3231:
- case ds_1340:
- if (t->tm_year > 299)
- return -EINVAL;
- default:
- if (t->tm_year > 199)
- return -EINVAL;
- break;
- }
+#ifdef CONFIG_RTC_DRV_DS1307_CENTURY
+ if (t->tm_year > (chip->century_bit ? 299 : 199))
+ return -EINVAL;
#else
- if (t->tm_year < 100 || t->tm_year > 199)
+ if (t->tm_year > 199)
return -EINVAL;
#endif
@@ -427,19 +418,12 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
tmp = t->tm_year - 100;
buf[DS1307_REG_YEAR] = bin2bcd(tmp);
- switch (ds1307->type) {
- case ds_1337:
- case ds_1339:
- case ds_3231:
- if (t->tm_year > 199)
- buf[DS1307_REG_MONTH] |= DS1337_BIT_CENTURY;
- break;
- case ds_1340:
- buf[DS1307_REG_HOUR] |= DS1340_BIT_CENTURY_EN;
- if (t->tm_year > 199)
- buf[DS1307_REG_HOUR] |= DS1340_BIT_CENTURY;
- break;
- case mcp794xx:
+ if (chip->century_enable_bit)
+ buf[chip->century_reg] |= chip->century_enable_bit;
+ if (t->tm_year > 199 && chip->century_bit)
+ buf[chip->century_reg] |= chip->century_bit;
+
+ if (ds1307->type == mcp794xx) {
/*
* these bits were cleared when preparing the date/time
* values and need to be set again before writing the
@@ -447,9 +431,6 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
*/
buf[DS1307_REG_SECS] |= MCP794XX_BIT_ST;
buf[DS1307_REG_WDAY] |= MCP794XX_BIT_VBATEN;
- break;
- default:
- break;
}
dev_dbg(dev, "%s: %7ph\n", "write", buf);