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rtc: ds1307: factor out century bit handling 

The driver has lots of places with chip-specific code what doesn't
necessarily facilitate maintenance.

Let's describe chip-specific differences in century bit handling
in struct chip_desc to improve this.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Heiner Kallweit 2017-06-05 17:57:33 +02:00 committed by Alexandre Belloni
parent 078f3f6452
commit e48585dec2
1 changed files with 27 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

73
drivers/rtc/rtc-ds1307.c
View File

@ -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);