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