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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>
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parent
078f3f6452
commit
e48585dec2
1 changed files with 27 additions and 46 deletions
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@ -136,6 +136,9 @@ struct chip_desc {
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unsigned alarm:1;
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u16 nvram_offset;
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u16 nvram_size;
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u8 century_reg;
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u8 century_enable_bit;
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u8 century_bit;
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u16 trickle_charger_reg;
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u8 trickle_charger_setup;
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u8 (*do_trickle_setup)(struct ds1307 *, uint32_t,
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@ -151,6 +154,8 @@ static struct chip_desc chips[last_ds_type] = {
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},
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[ds_1337] = {
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.alarm = 1,
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.century_reg = DS1307_REG_MONTH,
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.century_bit = DS1337_BIT_CENTURY,
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},
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[ds_1338] = {
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.nvram_offset = 8,
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@ -158,10 +163,15 @@ static struct chip_desc chips[last_ds_type] = {
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},
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[ds_1339] = {
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.alarm = 1,
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.century_reg = DS1307_REG_MONTH,
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.century_bit = DS1337_BIT_CENTURY,
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.trickle_charger_reg = 0x10,
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.do_trickle_setup = &do_trickle_setup_ds1339,
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},
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[ds_1340] = {
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.century_reg = DS1307_REG_HOUR,
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.century_enable_bit = DS1340_BIT_CENTURY_EN,
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.century_bit = DS1340_BIT_CENTURY,
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.trickle_charger_reg = 0x08,
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},
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[ds_1388] = {
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@ -169,6 +179,8 @@ static struct chip_desc chips[last_ds_type] = {
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},
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[ds_3231] = {
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.alarm = 1,
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.century_reg = DS1307_REG_MONTH,
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.century_bit = DS1337_BIT_CENTURY,
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},
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[rx_8130] = {
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.alarm = 1,
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@ -328,6 +340,7 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t)
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{
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struct ds1307 *ds1307 = dev_get_drvdata(dev);
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int tmp, ret;
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const struct chip_desc *chip = &chips[ds1307->type];
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/* read the RTC date and time registers all at once */
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ret = regmap_bulk_read(ds1307->regmap, ds1307->offset, ds1307->regs, 7);
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@ -355,22 +368,9 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t)
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t->tm_mon = bcd2bin(tmp) - 1;
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t->tm_year = bcd2bin(ds1307->regs[DS1307_REG_YEAR]) + 100;
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#ifdef CONFIG_RTC_DRV_DS1307_CENTURY
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switch (ds1307->type) {
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case ds_1337:
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case ds_1339:
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case ds_3231:
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if (ds1307->regs[DS1307_REG_MONTH] & DS1337_BIT_CENTURY)
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if (ds1307->regs[chip->century_reg] & chip->century_bit &&
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IS_ENABLED(CONFIG_RTC_DRV_DS1307_CENTURY))
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t->tm_year += 100;
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break;
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case ds_1340:
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if (ds1307->regs[DS1307_REG_HOUR] & DS1340_BIT_CENTURY)
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t->tm_year += 100;
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break;
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default:
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break;
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}
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#endif
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dev_dbg(dev, "%s secs=%d, mins=%d, "
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"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
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@ -385,6 +385,7 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t)
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static int ds1307_set_time(struct device *dev, struct rtc_time *t)
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{
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struct ds1307 *ds1307 = dev_get_drvdata(dev);
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const struct chip_desc *chip = &chips[ds1307->type];
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int result;
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int tmp;
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u8 *buf = ds1307->regs;
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@ -395,24 +396,14 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
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t->tm_hour, t->tm_mday,
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t->tm_mon, t->tm_year, t->tm_wday);
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#ifdef CONFIG_RTC_DRV_DS1307_CENTURY
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if (t->tm_year < 100)
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return -EINVAL;
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switch (ds1307->type) {
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case ds_1337:
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case ds_1339:
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case ds_3231:
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case ds_1340:
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if (t->tm_year > 299)
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#ifdef CONFIG_RTC_DRV_DS1307_CENTURY
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if (t->tm_year > (chip->century_bit ? 299 : 199))
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return -EINVAL;
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default:
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if (t->tm_year > 199)
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return -EINVAL;
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break;
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}
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#else
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if (t->tm_year < 100 || t->tm_year > 199)
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if (t->tm_year > 199)
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return -EINVAL;
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#endif
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@ -427,19 +418,12 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
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tmp = t->tm_year - 100;
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buf[DS1307_REG_YEAR] = bin2bcd(tmp);
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switch (ds1307->type) {
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case ds_1337:
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case ds_1339:
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case ds_3231:
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if (t->tm_year > 199)
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buf[DS1307_REG_MONTH] |= DS1337_BIT_CENTURY;
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break;
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case ds_1340:
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buf[DS1307_REG_HOUR] |= DS1340_BIT_CENTURY_EN;
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if (t->tm_year > 199)
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buf[DS1307_REG_HOUR] |= DS1340_BIT_CENTURY;
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break;
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case mcp794xx:
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if (chip->century_enable_bit)
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buf[chip->century_reg] |= chip->century_enable_bit;
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if (t->tm_year > 199 && chip->century_bit)
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buf[chip->century_reg] |= chip->century_bit;
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if (ds1307->type == mcp794xx) {
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/*
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* these bits were cleared when preparing the date/time
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* values and need to be set again before writing the
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@ -447,9 +431,6 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
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*/
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buf[DS1307_REG_SECS] |= MCP794XX_BIT_ST;
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buf[DS1307_REG_WDAY] |= MCP794XX_BIT_VBATEN;
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break;
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default:
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break;
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}
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dev_dbg(dev, "%s: %7ph\n", "write", buf);
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