mirror of
https://github.com/torvalds/linux.git
synced 2024-11-26 22:21:42 +00:00
rtc: add rtc-abx80x, a driver for the Abracon AB x80x i2c rtc
This is a basic driver for the ultra-low-power Abracon AB x80x series of RTC chips. It supports in particular, the supersets AB0805 and AB1805. It allows reading and writing the time, and enables the supercapacitor/ battery charger. [arnd@arndb.de: abx805 depends on i2c] [alexandre.belloni@free-electrons.com: renam buffer from date to buf in abx80x_rtc_read_time()] Signed-off-by: Philippe De Muyter <phdm@macqel.be> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Paul Bolle <pebolle@tiscali.nl> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Philippe De Muyter
Linus Torvalds
parent
c71f1e05e6
commit
4d61ff6b99
@ -164,6 +164,16 @@ config RTC_DRV_ABB5ZES3
|
||||
This driver can also be built as a module. If so, the module
|
||||
will be called rtc-ab-b5ze-s3.
|
||||
|
||||
config RTC_DRV_ABX80X
|
||||
tristate "Abracon ABx80x"
|
||||
help
|
||||
If you say yes here you get support for Abracon AB080X and AB180X
|
||||
families of ultra-low-power battery- and capacitor-backed real-time
|
||||
clock chips.
|
||||
|
||||
This driver can also be built as a module. If so, the module
|
||||
will be called rtc-abx80x.
|
||||
|
||||
config RTC_DRV_AS3722
|
||||
tristate "ams AS3722 RTC driver"
|
||||
depends on MFD_AS3722
|
||||
|
||||
@ -25,6 +25,7 @@ obj-$(CONFIG_RTC_DRV_88PM80X) += rtc-88pm80x.o
|
||||
obj-$(CONFIG_RTC_DRV_AB3100) += rtc-ab3100.o
|
||||
obj-$(CONFIG_RTC_DRV_AB8500) += rtc-ab8500.o
|
||||
obj-$(CONFIG_RTC_DRV_ABB5ZES3) += rtc-ab-b5ze-s3.o
|
||||
obj-$(CONFIG_RTC_DRV_ABX80X) += rtc-abx80x.o
|
||||
obj-$(CONFIG_RTC_DRV_ARMADA38X) += rtc-armada38x.o
|
||||
obj-$(CONFIG_RTC_DRV_AS3722) += rtc-as3722.o
|
||||
obj-$(CONFIG_RTC_DRV_AT32AP700X)+= rtc-at32ap700x.o
|
||||
|
||||
307
drivers/rtc/rtc-abx80x.c
Normal file
307
drivers/rtc/rtc-abx80x.c
Normal file
@ -0,0 +1,307 @@
|
||||
/*
|
||||
* A driver for the I2C members of the Abracon AB x8xx RTC family,
|
||||
* and compatible: AB 1805 and AB 0805
|
||||
*
|
||||
* Copyright 2014-2015 Macq S.A.
|
||||
*
|
||||
* Author: Philippe De Muyter <phdm@macqel.be>
|
||||
* Author: Alexandre Belloni <alexandre.belloni@free-electrons.com>
|
||||
*
|
||||
* 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
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/bcd.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/rtc.h>
|
||||
|
||||
#define ABX8XX_REG_HTH 0x00
|
||||
#define ABX8XX_REG_SC 0x01
|
||||
#define ABX8XX_REG_MN 0x02
|
||||
#define ABX8XX_REG_HR 0x03
|
||||
#define ABX8XX_REG_DA 0x04
|
||||
#define ABX8XX_REG_MO 0x05
|
||||
#define ABX8XX_REG_YR 0x06
|
||||
#define ABX8XX_REG_WD 0x07
|
||||
|
||||
#define ABX8XX_REG_CTRL1 0x10
|
||||
#define ABX8XX_CTRL_WRITE BIT(1)
|
||||
#define ABX8XX_CTRL_12_24 BIT(6)
|
||||
|
||||
#define ABX8XX_REG_CFG_KEY 0x1f
|
||||
#define ABX8XX_CFG_KEY_MISC 0x9d
|
||||
|
||||
#define ABX8XX_REG_ID0 0x28
|
||||
|
||||
#define ABX8XX_REG_TRICKLE 0x20
|
||||
#define ABX8XX_TRICKLE_CHARGE_ENABLE 0xa0
|
||||
#define ABX8XX_TRICKLE_STANDARD_DIODE 0x8
|
||||
#define ABX8XX_TRICKLE_SCHOTTKY_DIODE 0x4
|
||||
|
||||
static u8 trickle_resistors[] = {0, 3, 6, 11};
|
||||
|
||||
enum abx80x_chip {AB0801, AB0803, AB0804, AB0805,
|
||||
AB1801, AB1803, AB1804, AB1805, ABX80X};
|
||||
|
||||
struct abx80x_cap {
|
||||
u16 pn;
|
||||
bool has_tc;
|
||||
};
|
||||
|
||||
static struct abx80x_cap abx80x_caps[] = {
|
||||
[AB0801] = {.pn = 0x0801},
|
||||
[AB0803] = {.pn = 0x0803},
|
||||
[AB0804] = {.pn = 0x0804, .has_tc = true},
|
||||
[AB0805] = {.pn = 0x0805, .has_tc = true},
|
||||
[AB1801] = {.pn = 0x1801},
|
||||
[AB1803] = {.pn = 0x1803},
|
||||
[AB1804] = {.pn = 0x1804, .has_tc = true},
|
||||
[AB1805] = {.pn = 0x1805, .has_tc = true},
|
||||
[ABX80X] = {.pn = 0}
|
||||
};
|
||||
|
||||
static struct i2c_driver abx80x_driver;
|
||||
|
||||
static int abx80x_enable_trickle_charger(struct i2c_client *client,
|
||||
u8 trickle_cfg)
|
||||
{
|
||||
int err;
|
||||
|
||||
/*
|
||||
* Write the configuration key register to enable access to the Trickle
|
||||
* register
|
||||
*/
|
||||
err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
|
||||
ABX8XX_CFG_KEY_MISC);
|
||||
if (err < 0) {
|
||||
dev_err(&client->dev, "Unable to write configuration key\n");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
err = i2c_smbus_write_byte_data(client, ABX8XX_REG_TRICKLE,
|
||||
ABX8XX_TRICKLE_CHARGE_ENABLE |
|
||||
trickle_cfg);
|
||||
if (err < 0) {
|
||||
dev_err(&client->dev, "Unable to write trickle register\n");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
||||
{
|
||||
struct i2c_client *client = to_i2c_client(dev);
|
||||
unsigned char buf[8];
|
||||
int err;
|
||||
|
||||
err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_HTH,
|
||||
sizeof(buf), buf);
|
||||
if (err < 0) {
|
||||
dev_err(&client->dev, "Unable to read date\n");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
tm->tm_sec = bcd2bin(buf[ABX8XX_REG_SC] & 0x7F);
|
||||
tm->tm_min = bcd2bin(buf[ABX8XX_REG_MN] & 0x7F);
|
||||
tm->tm_hour = bcd2bin(buf[ABX8XX_REG_HR] & 0x3F);
|
||||
tm->tm_wday = buf[ABX8XX_REG_WD] & 0x7;
|
||||
tm->tm_mday = bcd2bin(buf[ABX8XX_REG_DA] & 0x3F);
|
||||
tm->tm_mon = bcd2bin(buf[ABX8XX_REG_MO] & 0x1F) - 1;
|
||||
tm->tm_year = bcd2bin(buf[ABX8XX_REG_YR]) + 100;
|
||||
|
||||
err = rtc_valid_tm(tm);
|
||||
if (err < 0)
|
||||
dev_err(&client->dev, "retrieved date/time is not valid.\n");
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
||||
{
|
||||
struct i2c_client *client = to_i2c_client(dev);
|
||||
unsigned char buf[8];
|
||||
int err;
|
||||
|
||||
if (tm->tm_year < 100)
|
||||
return -EINVAL;
|
||||
|
||||
buf[ABX8XX_REG_HTH] = 0;
|
||||
buf[ABX8XX_REG_SC] = bin2bcd(tm->tm_sec);
|
||||
buf[ABX8XX_REG_MN] = bin2bcd(tm->tm_min);
|
||||
buf[ABX8XX_REG_HR] = bin2bcd(tm->tm_hour);
|
||||
buf[ABX8XX_REG_DA] = bin2bcd(tm->tm_mday);
|
||||
buf[ABX8XX_REG_MO] = bin2bcd(tm->tm_mon + 1);
|
||||
buf[ABX8XX_REG_YR] = bin2bcd(tm->tm_year - 100);
|
||||
buf[ABX8XX_REG_WD] = tm->tm_wday;
|
||||
|
||||
err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_HTH,
|
||||
sizeof(buf), buf);
|
||||
if (err < 0) {
|
||||
dev_err(&client->dev, "Unable to write to date registers\n");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct rtc_class_ops abx80x_rtc_ops = {
|
||||
.read_time = abx80x_rtc_read_time,
|
||||
.set_time = abx80x_rtc_set_time,
|
||||
};
|
||||
|
||||
static int abx80x_dt_trickle_cfg(struct device_node *np)
|
||||
{
|
||||
const char *diode;
|
||||
int trickle_cfg = 0;
|
||||
int i, ret;
|
||||
u32 tmp;
|
||||
|
||||
ret = of_property_read_string(np, "abracon,tc-diode", &diode);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (!strcmp(diode, "standard"))
|
||||
trickle_cfg |= ABX8XX_TRICKLE_STANDARD_DIODE;
|
||||
else if (!strcmp(diode, "schottky"))
|
||||
trickle_cfg |= ABX8XX_TRICKLE_SCHOTTKY_DIODE;
|
||||
else
|
||||
return -EINVAL;
|
||||
|
||||
ret = of_property_read_u32(np, "abracon,tc-resistor", &tmp);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
for (i = 0; i < sizeof(trickle_resistors); i++)
|
||||
if (trickle_resistors[i] == tmp)
|
||||
break;
|
||||
|
||||
if (i == sizeof(trickle_resistors))
|
||||
return -EINVAL;
|
||||
|
||||
return (trickle_cfg | i);
|
||||
}
|
||||
|
||||
static int abx80x_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct device_node *np = client->dev.of_node;
|
||||
struct rtc_device *rtc;
|
||||
int i, data, err, trickle_cfg = -EINVAL;
|
||||
char buf[7];
|
||||
unsigned int part = id->driver_data;
|
||||
unsigned int partnumber;
|
||||
unsigned int majrev, minrev;
|
||||
unsigned int lot;
|
||||
unsigned int wafer;
|
||||
unsigned int uid;
|
||||
|
||||
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
|
||||
return -ENODEV;
|
||||
|
||||
err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ID0,
|
||||
sizeof(buf), buf);
|
||||
if (err < 0) {
|
||||
dev_err(&client->dev, "Unable to read partnumber\n");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
partnumber = (buf[0] << 8) | buf[1];
|
||||
majrev = buf[2] >> 3;
|
||||
minrev = buf[2] & 0x7;
|
||||
lot = ((buf[4] & 0x80) << 2) | ((buf[6] & 0x80) << 1) | buf[3];
|
||||
uid = ((buf[4] & 0x7f) << 8) | buf[5];
|
||||
wafer = (buf[6] & 0x7c) >> 2;
|
||||
dev_info(&client->dev, "model %04x, revision %u.%u, lot %x, wafer %x, uid %x\n",
|
||||
partnumber, majrev, minrev, lot, wafer, uid);
|
||||
|
||||
data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL1);
|
||||
if (data < 0) {
|
||||
dev_err(&client->dev, "Unable to read control register\n");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL1,
|
||||
((data & ~ABX8XX_CTRL_12_24) |
|
||||
ABX8XX_CTRL_WRITE));
|
||||
if (err < 0) {
|
||||
dev_err(&client->dev, "Unable to write control register\n");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
/* part autodetection */
|
||||
if (part == ABX80X) {
|
||||
for (i = 0; abx80x_caps[i].pn; i++)
|
||||
if (partnumber == abx80x_caps[i].pn)
|
||||
break;
|
||||
if (abx80x_caps[i].pn == 0) {
|
||||
dev_err(&client->dev, "Unknown part: %04x\n",
|
||||
partnumber);
|
||||
return -EINVAL;
|
||||
}
|
||||
part = i;
|
||||
}
|
||||
|
||||
if (partnumber != abx80x_caps[part].pn) {
|
||||
dev_err(&client->dev, "partnumber mismatch %04x != %04x\n",
|
||||
partnumber, abx80x_caps[part].pn);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (np && abx80x_caps[part].has_tc)
|
||||
trickle_cfg = abx80x_dt_trickle_cfg(np);
|
||||
|
||||
if (trickle_cfg > 0) {
|
||||
dev_info(&client->dev, "Enabling trickle charger: %02x\n",
|
||||
trickle_cfg);
|
||||
abx80x_enable_trickle_charger(client, trickle_cfg);
|
||||
}
|
||||
|
||||
rtc = devm_rtc_device_register(&client->dev, abx80x_driver.driver.name,
|
||||
&abx80x_rtc_ops, THIS_MODULE);
|
||||
|
||||
if (IS_ERR(rtc))
|
||||
return PTR_ERR(rtc);
|
||||
|
||||
i2c_set_clientdata(client, rtc);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int abx80x_remove(struct i2c_client *client)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct i2c_device_id abx80x_id[] = {
|
||||
{ "abx80x", ABX80X },
|
||||
{ "ab0801", AB0801 },
|
||||
{ "ab0803", AB0803 },
|
||||
{ "ab0804", AB0804 },
|
||||
{ "ab0805", AB0805 },
|
||||
{ "ab1801", AB1801 },
|
||||
{ "ab1803", AB1803 },
|
||||
{ "ab1804", AB1804 },
|
||||
{ "ab1805", AB1805 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, abx80x_id);
|
||||
|
||||
static struct i2c_driver abx80x_driver = {
|
||||
.driver = {
|
||||
.name = "rtc-abx80x",
|
||||
},
|
||||
.probe = abx80x_probe,
|
||||
.remove = abx80x_remove,
|
||||
.id_table = abx80x_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(abx80x_driver);
|
||||
|
||||
MODULE_AUTHOR("Philippe De Muyter <phdm@macqel.be>");
|
||||
MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>");
|
||||
MODULE_DESCRIPTION("Abracon ABX80X RTC driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user