u8 ctrl1;
};
-static int rx8025_read_reg(struct i2c_client *client, int number, u8 *value)
+static s32 rx8025_read_reg(const struct i2c_client *client, u8 number)
{
- int ret = i2c_smbus_read_byte_data(client, (number << 4) | 0x08);
+ return i2c_smbus_read_byte_data(client, number << 4);
+}
- if (ret < 0) {
- dev_err(&client->dev, "Unable to read register #%d\n", number);
- return ret;
- }
+static int rx8025_read_regs(const struct i2c_client *client,
+ u8 number, u8 length, u8 *values)
+{
+ int ret = i2c_smbus_read_i2c_block_data(client, number << 4, length,
+ values);
+ if (ret != length)
+ return ret < 0 ? ret : -EIO;
- *value = ret;
return 0;
}
-static int rx8025_read_regs(struct i2c_client *client,
- int number, u8 length, u8 *values)
+static s32 rx8025_write_reg(const struct i2c_client *client, u8 number,
+ u8 value)
{
- int ret = i2c_smbus_read_i2c_block_data(client, (number << 4) | 0x08,
- length, values);
-
- if (ret != length) {
- dev_err(&client->dev, "Unable to read registers #%d..#%d\n",
- number, number + length - 1);
- return ret < 0 ? ret : -EIO;
- }
+ return i2c_smbus_write_byte_data(client, number << 4, value);
+}
- return 0;
+static s32 rx8025_write_regs(const struct i2c_client *client,
+ u8 number, u8 length, const u8 *values)
+{
+ return i2c_smbus_write_i2c_block_data(client, number << 4,
+ length, values);
}
-static int rx8025_write_reg(struct i2c_client *client, int number, u8 value)
+static int rx8025_check_validity(struct device *dev)
{
- int ret = i2c_smbus_write_byte_data(client, number << 4, value);
+ struct rx8025_data *rx8025 = dev_get_drvdata(dev);
+ int ctrl2;
+
+ ctrl2 = rx8025_read_reg(rx8025->client, RX8025_REG_CTRL2);
+ if (ctrl2 < 0)
+ return ctrl2;
- if (ret)
- dev_err(&client->dev, "Unable to write register #%d\n",
- number);
+ if (ctrl2 & RX8025_BIT_CTRL2_VDET)
+ dev_warn(dev, "power voltage drop detected\n");
- return ret;
+ if (ctrl2 & RX8025_BIT_CTRL2_PON) {
+ dev_warn(dev, "power-on reset detected, date is invalid\n");
+ return -EINVAL;
+ }
+
+ if (!(ctrl2 & RX8025_BIT_CTRL2_XST)) {
+ dev_warn(dev, "crystal stopped, date is invalid\n");
+ return -EINVAL;
+ }
+
+ return 0;
}
-static int rx8025_write_regs(struct i2c_client *client,
- int number, u8 length, u8 *values)
+static int rx8025_reset_validity(struct i2c_client *client)
{
- int ret = i2c_smbus_write_i2c_block_data(client, (number << 4) | 0x08,
- length, values);
+ int ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
- if (ret)
- dev_err(&client->dev, "Unable to write registers #%d..#%d\n",
- number, number + length - 1);
+ if (ctrl2 < 0)
+ return ctrl2;
- return ret;
+ ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET);
+
+ return rx8025_write_reg(client, RX8025_REG_CTRL2,
+ ctrl2 | RX8025_BIT_CTRL2_XST);
}
static irqreturn_t rx8025_handle_irq(int irq, void *dev_id)
{
struct i2c_client *client = dev_id;
struct rx8025_data *rx8025 = i2c_get_clientdata(client);
- u8 status;
+ int status;
- if (rx8025_read_reg(client, RX8025_REG_CTRL2, &status))
+ status = rx8025_read_reg(client, RX8025_REG_CTRL2);
+ if (status < 0)
goto out;
if (!(status & RX8025_BIT_CTRL2_XST))
rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF);
}
- /* acknowledge IRQ */
- rx8025_write_reg(client, RX8025_REG_CTRL2,
- status | RX8025_BIT_CTRL2_XST);
-
out:
return IRQ_HANDLED;
}
u8 date[7];
int err;
+ err = rx8025_check_validity(dev);
+ if (err)
+ return err;
+
err = rx8025_read_regs(rx8025->client, RX8025_REG_SEC, 7, date);
if (err)
return err;
dt->tm_mday = bcd2bin(date[RX8025_REG_MDAY] & 0x3f);
dt->tm_mon = bcd2bin(date[RX8025_REG_MONTH] & 0x1f) - 1;
- dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]);
-
- if (dt->tm_year < 70)
- dt->tm_year += 100;
+ dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]) + 100;
dev_dbg(dev, "%s: date %ds %dm %dh %dmd %dm %dy\n", __func__,
dt->tm_sec, dt->tm_min, dt->tm_hour,
{
struct rx8025_data *rx8025 = dev_get_drvdata(dev);
u8 date[7];
+ int ret;
- /*
- * BUG: The HW assumes every year that is a multiple of 4 to be a leap
- * year. Next time this is wrong is 2100, which will not be a leap
- * year.
- */
+ if ((dt->tm_year < 100) || (dt->tm_year > 199))
+ return -EINVAL;
/*
* Here the read-only bits are written as "0". I'm not sure if that
date[RX8025_REG_WDAY] = bin2bcd(dt->tm_wday);
date[RX8025_REG_MDAY] = bin2bcd(dt->tm_mday);
date[RX8025_REG_MONTH] = bin2bcd(dt->tm_mon + 1);
- date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year % 100);
+ date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year - 100);
dev_dbg(dev,
"%s: write 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n",
__func__,
date[0], date[1], date[2], date[3], date[4], date[5], date[6]);
- return rx8025_write_regs(rx8025->client, RX8025_REG_SEC, 7, date);
+ ret = rx8025_write_regs(rx8025->client, RX8025_REG_SEC, 7, date);
+ if (ret < 0)
+ return ret;
+
+ return rx8025_reset_validity(rx8025->client);
}
-static int rx8025_init_client(struct i2c_client *client, int *need_reset)
+static int rx8025_init_client(struct i2c_client *client)
{
struct rx8025_data *rx8025 = i2c_get_clientdata(client);
u8 ctrl[2], ctrl2;
/* Keep test bit zero ! */
rx8025->ctrl1 = ctrl[0] & ~RX8025_BIT_CTRL1_TEST;
- if (ctrl[1] & RX8025_BIT_CTRL2_PON) {
- dev_warn(&client->dev, "power-on reset was detected, "
- "you may have to readjust the clock\n");
- *need_reset = 1;
- }
-
- if (ctrl[1] & RX8025_BIT_CTRL2_VDET) {
- dev_warn(&client->dev, "a power voltage drop was detected, "
- "you may have to readjust the clock\n");
- *need_reset = 1;
- }
-
- if (!(ctrl[1] & RX8025_BIT_CTRL2_XST)) {
- dev_warn(&client->dev, "Oscillation stop was detected,"
- "you may have to readjust the clock\n");
- *need_reset = 1;
- }
-
if (ctrl[1] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) {
dev_warn(&client->dev, "Alarm was detected\n");
need_clear = 1;
}
- if (!(ctrl[1] & RX8025_BIT_CTRL2_CTFG))
+ if (ctrl[1] & RX8025_BIT_CTRL2_CTFG)
need_clear = 1;
- if (*need_reset || need_clear) {
- ctrl2 = ctrl[0];
- ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET |
- RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG |
+ if (need_clear) {
+ ctrl2 = ctrl[1];
+ ctrl2 &= ~(RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG |
RX8025_BIT_CTRL2_DAFG);
- ctrl2 |= RX8025_BIT_CTRL2_XST;
err = rx8025_write_reg(client, RX8025_REG_CTRL2, ctrl2);
}
{
struct rx8025_data *rx8025 = dev_get_drvdata(dev);
struct i2c_client *client = rx8025->client;
- u8 ctrl2, ald[2];
- int err;
+ u8 ald[2];
+ int ctrl2, err;
if (client->irq <= 0)
return -EINVAL;
if (err)
return err;
- err = rx8025_read_reg(client, RX8025_REG_CTRL2, &ctrl2);
- if (err)
- return err;
+ ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
+ if (ctrl2 < 0)
+ return ctrl2;
dev_dbg(dev, "%s: read alarm 0x%02x 0x%02x ctrl2 %02x\n",
__func__, ald[0], ald[1], ctrl2);
static int rx8025_get_clock_adjust(struct device *dev, int *adj)
{
struct i2c_client *client = to_i2c_client(dev);
- u8 digoff;
- int err;
+ int digoff;
- err = rx8025_read_reg(client, RX8025_REG_DIGOFF, &digoff);
- if (err)
- return err;
+ digoff = rx8025_read_reg(client, RX8025_REG_DIGOFF);
+ if (digoff < 0)
+ return digoff;
*adj = digoff >= 64 ? digoff - 128 : digoff;
if (*adj > 0)
{
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct rx8025_data *rx8025;
- int err = 0, need_reset = 0;
+ int err = 0;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
| I2C_FUNC_SMBUS_I2C_BLOCK)) {
rx8025->client = client;
i2c_set_clientdata(client, rx8025);
- err = rx8025_init_client(client, &need_reset);
+ err = rx8025_init_client(client);
if (err)
return err;
- if (need_reset) {
- struct rtc_time tm;
- dev_info(&client->dev,
- "bad conditions detected, resetting date\n");
- rtc_time_to_tm(0, &tm); /* 1970/1/1 */
- rx8025_set_time(&client->dev, &tm);
- }
-
rx8025->rtc = devm_rtc_device_register(&client->dev, client->name,
&rx8025_rtc_ops, THIS_MODULE);
if (IS_ERR(rx8025->rtc)) {
rx8025_handle_irq, 0, "rx8025",
client);
if (err) {
- dev_err(&client->dev, "unable to request IRQ\n");
- return err;
+ dev_err(&client->dev, "unable to request IRQ, alarms disabled\n");
+ client->irq = 0;
}
}
- rx8025->rtc->irq_freq = 1;
rx8025->rtc->max_user_freq = 1;
err = rx8025_sysfs_register(&client->dev);