diff options
| -rw-r--r-- | drivers/rtc/rtc-abx80x.c | 145 |
1 files changed, 141 insertions, 4 deletions
diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c index 203e6616d413..d41bbcd653f6 100644 --- a/drivers/rtc/rtc-abx80x.c +++ b/drivers/rtc/rtc-abx80x.c @@ -27,10 +27,28 @@ #define ABX8XX_REG_YR 0x06 #define ABX8XX_REG_WD 0x07 +#define ABX8XX_REG_AHTH 0x08 +#define ABX8XX_REG_ASC 0x09 +#define ABX8XX_REG_AMN 0x0a +#define ABX8XX_REG_AHR 0x0b +#define ABX8XX_REG_ADA 0x0c +#define ABX8XX_REG_AMO 0x0d +#define ABX8XX_REG_AWD 0x0e + +#define ABX8XX_REG_STATUS 0x0f +#define ABX8XX_STATUS_AF BIT(2) + #define ABX8XX_REG_CTRL1 0x10 #define ABX8XX_CTRL_WRITE BIT(0) +#define ABX8XX_CTRL_ARST BIT(2) #define ABX8XX_CTRL_12_24 BIT(6) +#define ABX8XX_REG_IRQ 0x12 +#define ABX8XX_IRQ_AIE BIT(2) +#define ABX8XX_IRQ_IM_1_4 (0x3 << 5) + +#define ABX8XX_REG_CD_TIMER_CTL 0x18 + #define ABX8XX_REG_CFG_KEY 0x1f #define ABX8XX_CFG_KEY_MISC 0x9d @@ -63,8 +81,6 @@ static struct abx80x_cap abx80x_caps[] = { [ABX80X] = {.pn = 0} }; -static struct i2c_driver abx80x_driver; - static int abx80x_enable_trickle_charger(struct i2c_client *client, u8 trickle_cfg) { @@ -148,9 +164,111 @@ static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm) return 0; } +static irqreturn_t abx80x_handle_irq(int irq, void *dev_id) +{ + struct i2c_client *client = dev_id; + struct rtc_device *rtc = i2c_get_clientdata(client); + int status; + + status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS); + if (status < 0) + return IRQ_NONE; + + if (status & ABX8XX_STATUS_AF) + rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF); + + i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0); + + return IRQ_HANDLED; +} + +static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t) +{ + struct i2c_client *client = to_i2c_client(dev); + unsigned char buf[7]; + + int irq_mask, err; + + if (client->irq <= 0) + return -EINVAL; + + err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC, + sizeof(buf), buf); + if (err) + return err; + + irq_mask = i2c_smbus_read_byte_data(client, ABX8XX_REG_IRQ); + if (irq_mask < 0) + return irq_mask; + + t->time.tm_sec = bcd2bin(buf[0] & 0x7F); + t->time.tm_min = bcd2bin(buf[1] & 0x7F); + t->time.tm_hour = bcd2bin(buf[2] & 0x3F); + t->time.tm_mday = bcd2bin(buf[3] & 0x3F); + t->time.tm_mon = bcd2bin(buf[4] & 0x1F) - 1; + t->time.tm_wday = buf[5] & 0x7; + + t->enabled = !!(irq_mask & ABX8XX_IRQ_AIE); + t->pending = (buf[6] & ABX8XX_STATUS_AF) && t->enabled; + + return err; +} + +static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t) +{ + struct i2c_client *client = to_i2c_client(dev); + u8 alarm[6]; + int err; + + if (client->irq <= 0) + return -EINVAL; + + alarm[0] = 0x0; + alarm[1] = bin2bcd(t->time.tm_sec); + alarm[2] = bin2bcd(t->time.tm_min); + alarm[3] = bin2bcd(t->time.tm_hour); + alarm[4] = bin2bcd(t->time.tm_mday); + alarm[5] = bin2bcd(t->time.tm_mon + 1); + + err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_AHTH, + sizeof(alarm), alarm); + if (err < 0) { + dev_err(&client->dev, "Unable to write alarm registers\n"); + return -EIO; + } + + if (t->enabled) { + err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ, + (ABX8XX_IRQ_IM_1_4 | + ABX8XX_IRQ_AIE)); + if (err) + return err; + } + + return 0; +} + +static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled) +{ + struct i2c_client *client = to_i2c_client(dev); + int err; + + if (enabled) + err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ, + (ABX8XX_IRQ_IM_1_4 | + ABX8XX_IRQ_AIE)); + else + err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ, + ABX8XX_IRQ_IM_1_4); + return err; +} + static const struct rtc_class_ops abx80x_rtc_ops = { .read_time = abx80x_rtc_read_time, .set_time = abx80x_rtc_set_time, + .read_alarm = abx80x_read_alarm, + .set_alarm = abx80x_set_alarm, + .alarm_irq_enable = abx80x_alarm_irq_enable, }; static int abx80x_dt_trickle_cfg(struct device_node *np) @@ -225,7 +343,8 @@ static int abx80x_probe(struct i2c_client *client, } err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL1, - ((data & ~ABX8XX_CTRL_12_24) | + ((data & ~(ABX8XX_CTRL_12_24 | + ABX8XX_CTRL_ARST)) | ABX8XX_CTRL_WRITE)); if (err < 0) { dev_err(&client->dev, "Unable to write control register\n"); @@ -260,7 +379,12 @@ static int abx80x_probe(struct i2c_client *client, abx80x_enable_trickle_charger(client, trickle_cfg); } - rtc = devm_rtc_device_register(&client->dev, abx80x_driver.driver.name, + err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CD_TIMER_CTL, + BIT(2)); + if (err) + return err; + + rtc = devm_rtc_device_register(&client->dev, "abx8xx", &abx80x_rtc_ops, THIS_MODULE); if (IS_ERR(rtc)) @@ -268,6 +392,19 @@ static int abx80x_probe(struct i2c_client *client, i2c_set_clientdata(client, rtc); + if (client->irq > 0) { + dev_info(&client->dev, "IRQ %d supplied\n", client->irq); + err = devm_request_threaded_irq(&client->dev, client->irq, NULL, + abx80x_handle_irq, + IRQF_SHARED | IRQF_ONESHOT, + "abx8xx", + client); + if (err) { + dev_err(&client->dev, "unable to request IRQ, alarms disabled\n"); + client->irq = 0; + } + } + return 0; } |