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rtc: add EPSON RX8025 support to DS1307 RTC driver

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Add support for the EPSON RX8025 RTC.  The date/time registers of this
chip are compatible with the DS1307.

Signed-off-by: Matthias Fuchs <matthias.fuchs@esd-electronics.com>
Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthias Fuchs 2009-03-31 15:24:58 -07:00 committed by Linus Torvalds
parent 30e7b039b1
commit a216685818
2 changed files with 84 additions and 3 deletions
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7
drivers/rtc/Kconfig
View file

@ -129,13 +129,14 @@ comment "I2C RTC drivers"
if I2C
config RTC_DRV_DS1307
tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00"
tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025"
help
If you say yes here you get support for various compatible RTC
chips (often with battery backup) connected with I2C. This driver
should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
and probably other chips. In some cases the RTC must already
have been initialized (by manufacturing or a bootloader).
EPSON RX-8025 and probably other chips. In some cases the RTC
must already have been initialized (by manufacturing or a
bootloader).
The first seven registers on these chips hold an RTC, and other
registers may add features such as NVRAM, a trickle charger for

80
drivers/rtc/rtc-ds1307.c
View file

@ -3,6 +3,7 @@
*
* Copyright (C) 2005 James Chapman (ds1337 core)
* Copyright (C) 2006 David Brownell
* Copyright (C) 2009 Matthias Fuchs (rx8025 support)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@ -31,6 +32,7 @@ enum ds_type {
ds_1339,
ds_1340,
m41t00,
rx_8025,
// rs5c372 too? different address...
};
@ -83,6 +85,12 @@ enum ds_type {
#define DS1339_REG_ALARM1_SECS 0x07
#define DS1339_REG_TRICKLE 0x10
#define RX8025_REG_CTRL1 0x0e
# define RX8025_BIT_2412 0x20
#define RX8025_REG_CTRL2 0x0f
# define RX8025_BIT_PON 0x10
# define RX8025_BIT_VDET 0x40
# define RX8025_BIT_XST 0x20
struct ds1307 {
@ -121,6 +129,8 @@ static const struct chip_desc chips[] = {
[ds_1340] = {
},
[m41t00] = {
},
[rx_8025] = {
}, };
static const struct i2c_device_id ds1307_id[] = {
@ -130,6 +140,7 @@ static const struct i2c_device_id ds1307_id[] = {
{ "ds1339", ds_1339 },
{ "ds1340", ds_1340 },
{ "m41t00", m41t00 },
{ "rx8025", rx_8025 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ds1307_id);
@ -674,6 +685,72 @@ static int __devinit ds1307_probe(struct i2c_client *client,
dev_warn(&client->dev, "SET TIME!\n");
}
break;
case rx_8025:
tmp = i2c_smbus_read_i2c_block_data(ds1307->client,
RX8025_REG_CTRL1 << 4 | 0x08, 2, buf);
if (tmp != 2) {
pr_debug("read error %d\n", tmp);
err = -EIO;
goto exit_free;
}
/* oscillator off? turn it on, so clock can tick. */
if (!(ds1307->regs[1] & RX8025_BIT_XST)) {
ds1307->regs[1] |= RX8025_BIT_XST;
i2c_smbus_write_byte_data(client,
RX8025_REG_CTRL2 << 4 | 0x08,
ds1307->regs[1]);
dev_warn(&client->dev,
"oscillator stop detected - SET TIME!\n");
}
if (ds1307->regs[1] & RX8025_BIT_PON) {
ds1307->regs[1] &= ~RX8025_BIT_PON;
i2c_smbus_write_byte_data(client,
RX8025_REG_CTRL2 << 4 | 0x08,
ds1307->regs[1]);
dev_warn(&client->dev, "power-on detected\n");
}
if (ds1307->regs[1] & RX8025_BIT_VDET) {
ds1307->regs[1] &= ~RX8025_BIT_VDET;
i2c_smbus_write_byte_data(client,
RX8025_REG_CTRL2 << 4 | 0x08,
ds1307->regs[1]);
dev_warn(&client->dev, "voltage drop detected\n");
}
/* make sure we are running in 24hour mode */
if (!(ds1307->regs[0] & RX8025_BIT_2412)) {
u8 hour;
/* switch to 24 hour mode */
i2c_smbus_write_byte_data(client,
RX8025_REG_CTRL1 << 4 | 0x08,
ds1307->regs[0] |
RX8025_BIT_2412);
tmp = i2c_smbus_read_i2c_block_data(ds1307->client,
RX8025_REG_CTRL1 << 4 | 0x08, 2, buf);
if (tmp != 2) {
pr_debug("read error %d\n", tmp);
err = -EIO;
goto exit_free;
}
/* correct hour */
hour = bcd2bin(ds1307->regs[DS1307_REG_HOUR]);
if (hour == 12)
hour = 0;
if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
hour += 12;
i2c_smbus_write_byte_data(client,
DS1307_REG_HOUR << 4 | 0x08,
hour);
}
break;
default:
break;
}
@ -734,6 +811,7 @@ read_rtc:
dev_warn(&client->dev, "SET TIME!\n");
}
break;
case rx_8025:
case ds_1337:
case ds_1339:
break;
@ -747,6 +825,8 @@ read_rtc:
* systems that will run through year 2100.
*/
break;
case rx_8025:
break;
default:
if (!(tmp & DS1307_BIT_12HR))
break;