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rtc: add initial support for mcp7941x parts

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Add initial support for the microchip mcp7941x series of real time clocks.

The mcp7941x series is generally compatible with the ds1307 and ds1337 rtc
devices from dallas semiconductor.  minor differences include a backup
battery enable bit, and the polarity of the oscillator enable bit.

Signed-off-by: David Anders <danders.dev@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Reviewed-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Anders 2011-11-02 13:37:53 -07:00 committed by Linus Torvalds
parent 6d03d06db8
commit 43fcb81550
1 changed files with 27 additions and 0 deletions
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27
drivers/rtc/rtc-ds1307.c
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@ -34,6 +34,7 @@ enum ds_type {
ds_1388,
ds_3231,
m41t00,
mcp7941x,
rx_8025,
// rs5c372 too? different address...
};
@ -43,6 +44,7 @@ enum ds_type {
#define DS1307_REG_SECS 0x00 /* 00-59 */
# define DS1307_BIT_CH 0x80
# define DS1340_BIT_nEOSC 0x80
# define MCP7941X_BIT_ST 0x80
#define DS1307_REG_MIN 0x01 /* 00-59 */
#define DS1307_REG_HOUR 0x02 /* 00-23, or 1-12{am,pm} */
# define DS1307_BIT_12HR 0x40 /* in REG_HOUR */
@ -50,6 +52,7 @@ enum ds_type {
# define DS1340_BIT_CENTURY_EN 0x80 /* in REG_HOUR */
# define DS1340_BIT_CENTURY 0x40 /* in REG_HOUR */
#define DS1307_REG_WDAY 0x03 /* 01-07 */
# define MCP7941X_BIT_VBATEN 0x08
#define DS1307_REG_MDAY 0x04 /* 01-31 */
#define DS1307_REG_MONTH 0x05 /* 01-12 */
# define DS1337_BIT_CENTURY 0x80 /* in REG_MONTH */
@ -137,6 +140,8 @@ static const struct chip_desc chips[] = {
},
[m41t00] = {
},
[mcp7941x] = {
},
[rx_8025] = {
}, };
@ -149,6 +154,7 @@ static const struct i2c_device_id ds1307_id[] = {
{ "ds1340", ds_1340 },
{ "ds3231", ds_3231 },
{ "m41t00", m41t00 },
{ "mcp7941x", mcp7941x },
{ "pt7c4338", ds_1307 },
{ "rx8025", rx_8025 },
{ }
@ -365,6 +371,10 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
buf[DS1307_REG_HOUR] |= DS1340_BIT_CENTURY_EN
| DS1340_BIT_CENTURY;
break;
case mcp7941x:
buf[DS1307_REG_SECS] |= MCP7941X_BIT_ST;
buf[DS1307_REG_WDAY] |= MCP7941X_BIT_VBATEN;
break;
default:
break;
}
@ -808,6 +818,23 @@ static int __devinit ds1307_probe(struct i2c_client *client,
i2c_smbus_write_byte_data(client, DS1340_REG_FLAG, 0);
dev_warn(&client->dev, "SET TIME!\n");
}
break;
case mcp7941x:
/* make sure that the backup battery is enabled */
if (!(ds1307->regs[DS1307_REG_WDAY] & MCP7941X_BIT_VBATEN)) {
i2c_smbus_write_byte_data(client, DS1307_REG_WDAY,
ds1307->regs[DS1307_REG_WDAY]
| MCP7941X_BIT_VBATEN);
}
/* clock halted? turn it on, so clock can tick. */
if (!(tmp & MCP7941X_BIT_ST)) {
i2c_smbus_write_byte_data(client, DS1307_REG_SECS,
MCP7941X_BIT_ST);
dev_warn(&client->dev, "SET TIME!\n");
goto read_rtc;
}
break;
case rx_8025:
case ds_1337: