#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/bcd.h>
+#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/log2.h>
#define RX8581_CTRL_RESET 0x01 /* RESET bit */
struct rx8581 {
- struct i2c_client *client;
+ struct regmap *regmap;
struct rtc_device *rtc;
- s32 (*read_block_data)(const struct i2c_client *client, u8 command,
- u8 length, u8 *values);
- s32 (*write_block_data)(const struct i2c_client *client, u8 command,
- u8 length, const u8 *values);
};
-static struct i2c_driver rx8581_driver;
-
-static int rx8581_read_block_data(const struct i2c_client *client, u8 command,
- u8 length, u8 *values)
-{
- s32 i, data;
-
- for (i = 0; i < length; i++) {
- data = i2c_smbus_read_byte_data(client, command + i);
- if (data < 0)
- return data;
- values[i] = data;
- }
- return i;
-}
-
-static int rx8581_write_block_data(const struct i2c_client *client, u8 command,
- u8 length, const u8 *values)
-{
- s32 i, ret;
-
- for (i = 0; i < length; i++) {
- ret = i2c_smbus_write_byte_data(client, command + i,
- values[i]);
- if (ret < 0)
- return ret;
- }
- return length;
-}
-
/*
* In the routines that deal directly with the rx8581 hardware, we use
* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
*/
-static int rx8581_get_datetime(struct i2c_client *client, struct rtc_time *tm)
+static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
+ struct i2c_client *client = to_i2c_client(dev);
unsigned char date[7];
- int data, err;
+ unsigned int data;
+ int err;
struct rx8581 *rx8581 = i2c_get_clientdata(client);
/* First we ensure that the "update flag" is not set, we read the
* has been set, we know that the time has changed during the read so
* we repeat the whole process again.
*/
- data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG);
- if (data < 0) {
- dev_err(&client->dev, "Unable to read device flags\n");
- return -EIO;
+ err = regmap_read(rx8581->regmap, RX8581_REG_FLAG, &data);
+ if (err < 0)
+ return err;
+
+ if (data & RX8581_FLAG_VLF) {
+ dev_warn(dev,
+ "low voltage detected, date/time is not reliable.\n");
+ return -EINVAL;
}
do {
/* If update flag set, clear it */
if (data & RX8581_FLAG_UF) {
- err = i2c_smbus_write_byte_data(client,
- RX8581_REG_FLAG, (data & ~RX8581_FLAG_UF));
- if (err != 0) {
- dev_err(&client->dev, "Unable to write device flags\n");
- return -EIO;
- }
+ err = regmap_write(rx8581->regmap, RX8581_REG_FLAG,
+ data & ~RX8581_FLAG_UF);
+ if (err < 0)
+ return err;
}
/* Now read time and date */
- err = rx8581->read_block_data(client, RX8581_REG_SC,
- 7, date);
- if (err < 0) {
- dev_err(&client->dev, "Unable to read date\n");
- return -EIO;
- }
+ err = regmap_bulk_read(rx8581->regmap, RX8581_REG_SC, date,
+ sizeof(date));
+ if (err < 0)
+ return err;
/* Check flag register */
- data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG);
- if (data < 0) {
- dev_err(&client->dev, "Unable to read device flags\n");
- return -EIO;
- }
+ err = regmap_read(rx8581->regmap, RX8581_REG_FLAG, &data);
+ if (err < 0)
+ return err;
} while (data & RX8581_FLAG_UF);
- if (data & RX8581_FLAG_VLF)
- dev_info(&client->dev,
- "low voltage detected, date/time is not reliable.\n");
-
- dev_dbg(&client->dev,
- "%s: raw data is sec=%02x, min=%02x, hr=%02x, "
+ dev_dbg(dev, "%s: raw data is sec=%02x, min=%02x, hr=%02x, "
"wday=%02x, mday=%02x, mon=%02x, year=%02x\n",
__func__,
date[0], date[1], date[2], date[3], date[4], date[5], date[6]);
tm->tm_wday = ilog2(date[RX8581_REG_DW] & 0x7F);
tm->tm_mday = bcd2bin(date[RX8581_REG_DM] & 0x3F);
tm->tm_mon = bcd2bin(date[RX8581_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
- tm->tm_year = bcd2bin(date[RX8581_REG_YR]);
- if (tm->tm_year < 70)
- tm->tm_year += 100; /* assume we are in 1970...2069 */
-
+ tm->tm_year = bcd2bin(date[RX8581_REG_YR]) + 100;
- dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
+ dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
"mday=%d, mon=%d, year=%d, wday=%d\n",
__func__,
tm->tm_sec, tm->tm_min, tm->tm_hour,
return 0;
}
-static int rx8581_set_datetime(struct i2c_client *client, struct rtc_time *tm)
+static int rx8581_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
- int data, err;
+ struct i2c_client *client = to_i2c_client(dev);
+ int err;
unsigned char buf[7];
struct rx8581 *rx8581 = i2c_get_clientdata(client);
- dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
+ dev_dbg(dev, "%s: secs=%d, mins=%d, hours=%d, "
"mday=%d, mon=%d, year=%d, wday=%d\n",
__func__,
tm->tm_sec, tm->tm_min, tm->tm_hour,
buf[RX8581_REG_MO] = bin2bcd(tm->tm_mon + 1);
/* year and century */
- buf[RX8581_REG_YR] = bin2bcd(tm->tm_year % 100);
+ buf[RX8581_REG_YR] = bin2bcd(tm->tm_year - 100);
buf[RX8581_REG_DW] = (0x1 << tm->tm_wday);
/* Stop the clock */
- data = i2c_smbus_read_byte_data(client, RX8581_REG_CTRL);
- if (data < 0) {
- dev_err(&client->dev, "Unable to read control register\n");
- return -EIO;
- }
-
- err = i2c_smbus_write_byte_data(client, RX8581_REG_CTRL,
- (data | RX8581_CTRL_STOP));
- if (err < 0) {
- dev_err(&client->dev, "Unable to write control register\n");
- return -EIO;
- }
+ err = regmap_update_bits(rx8581->regmap, RX8581_REG_CTRL,
+ RX8581_CTRL_STOP, RX8581_CTRL_STOP);
+ if (err < 0)
+ return err;
/* write register's data */
- err = rx8581->write_block_data(client, RX8581_REG_SC, 7, buf);
- if (err < 0) {
- dev_err(&client->dev, "Unable to write to date registers\n");
- return -EIO;
- }
+ err = regmap_bulk_write(rx8581->regmap, RX8581_REG_SC,
+ buf, sizeof(buf));
+ if (err < 0)
+ return err;
/* get VLF and clear it */
- data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG);
- if (data < 0) {
- dev_err(&client->dev, "Unable to read flag register\n");
- return -EIO;
- }
-
- err = i2c_smbus_write_byte_data(client, RX8581_REG_FLAG,
- (data & ~(RX8581_FLAG_VLF)));
- if (err != 0) {
- dev_err(&client->dev, "Unable to write flag register\n");
- return -EIO;
- }
+ err = regmap_update_bits(rx8581->regmap, RX8581_REG_FLAG,
+ RX8581_FLAG_VLF, 0);
+ if (err < 0)
+ return err;
/* Restart the clock */
- data = i2c_smbus_read_byte_data(client, RX8581_REG_CTRL);
- if (data < 0) {
- dev_err(&client->dev, "Unable to read control register\n");
- return -EIO;
- }
-
- err = i2c_smbus_write_byte_data(client, RX8581_REG_CTRL,
- (data & ~(RX8581_CTRL_STOP)));
- if (err != 0) {
- dev_err(&client->dev, "Unable to write control register\n");
- return -EIO;
- }
-
- return 0;
-}
-
-static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm)
-{
- return rx8581_get_datetime(to_i2c_client(dev), tm);
-}
-
-static int rx8581_rtc_set_time(struct device *dev, struct rtc_time *tm)
-{
- return rx8581_set_datetime(to_i2c_client(dev), tm);
+ return regmap_update_bits(rx8581->regmap, RX8581_REG_CTRL,
+ RX8581_CTRL_STOP, 0);
}
static const struct rtc_class_ops rx8581_rtc_ops = {
const struct i2c_device_id *id)
{
struct rx8581 *rx8581;
+ static const struct regmap_config config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0xf,
+ };
dev_dbg(&client->dev, "%s\n", __func__);
- if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)
- && !i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
- return -EIO;
-
rx8581 = devm_kzalloc(&client->dev, sizeof(struct rx8581), GFP_KERNEL);
if (!rx8581)
return -ENOMEM;
i2c_set_clientdata(client, rx8581);
- rx8581->client = client;
-
- if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
- rx8581->read_block_data = i2c_smbus_read_i2c_block_data;
- rx8581->write_block_data = i2c_smbus_write_i2c_block_data;
- } else {
- rx8581->read_block_data = rx8581_read_block_data;
- rx8581->write_block_data = rx8581_write_block_data;
- }
- rx8581->rtc = devm_rtc_device_register(&client->dev,
- rx8581_driver.driver.name, &rx8581_rtc_ops, THIS_MODULE);
+ rx8581->regmap = devm_regmap_init_i2c(client, &config);
+ if (IS_ERR(rx8581->regmap))
+ return PTR_ERR(rx8581->regmap);
- if (IS_ERR(rx8581->rtc)) {
- dev_err(&client->dev,
- "unable to register the class device\n");
+ rx8581->rtc = devm_rtc_allocate_device(&client->dev);
+ if (IS_ERR(rx8581->rtc))
return PTR_ERR(rx8581->rtc);
- }
- return 0;
+ rx8581->rtc->ops = &rx8581_rtc_ops;
+ rx8581->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
+ rx8581->rtc->range_max = RTC_TIMESTAMP_END_2099;
+ rx8581->rtc->start_secs = 0;
+ rx8581->rtc->set_start_time = true;
+
+ return rtc_register_device(rx8581->rtc);
}
static const struct i2c_device_id rx8581_id[] = {
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