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rtc: pcf8523: add alarm support
Alarm support requires unconditionally disabling clock out because it is using the int1 pin. Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20210418002023.1000265-2-alexandre.belloni@bootlin.com
This commit is contained in:
Alexandre Belloni
parent
94959a3a04
commit
13e37b7fb7
@ -8,10 +8,15 @@
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#include <linux/module.h>
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#include <linux/rtc.h>
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#include <linux/of.h>
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#include <linux/pm_wakeirq.h>
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#define REG_CONTROL1 0x00
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#define REG_CONTROL1_CAP_SEL BIT(7)
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#define REG_CONTROL1_STOP BIT(5)
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#define REG_CONTROL1_AIE BIT(1)
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#define REG_CONTROL2 0x01
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#define REG_CONTROL2_AF BIT(3)
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#define REG_CONTROL3 0x02
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#define REG_CONTROL3_PM_BLD BIT(7) /* battery low detection disabled */
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@ -30,9 +35,22 @@
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#define REG_MONTHS 0x08
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#define REG_YEARS 0x09
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#define REG_MINUTE_ALARM 0x0a
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#define REG_HOUR_ALARM 0x0b
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#define REG_DAY_ALARM 0x0c
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#define REG_WEEKDAY_ALARM 0x0d
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#define ALARM_DIS BIT(7)
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#define REG_OFFSET 0x0e
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#define REG_OFFSET_MODE BIT(7)
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#define REG_TMR_CLKOUT_CTRL 0x0f
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struct pcf8523 {
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struct rtc_device *rtc;
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struct i2c_client *client;
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};
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static int pcf8523_read(struct i2c_client *client, u8 reg, u8 *valuep)
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{
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struct i2c_msg msgs[2];
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@ -138,6 +156,27 @@ static int pcf8523_set_pm(struct i2c_client *client, u8 pm)
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return 0;
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}
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static irqreturn_t pcf8523_irq(int irq, void *dev_id)
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{
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struct pcf8523 *pcf8523 = i2c_get_clientdata(dev_id);
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u8 value;
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int err;
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err = pcf8523_read(pcf8523->client, REG_CONTROL2, &value);
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if (err < 0)
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return IRQ_HANDLED;
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if (value & REG_CONTROL2_AF) {
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value &= ~REG_CONTROL2_AF;
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pcf8523_write(pcf8523->client, REG_CONTROL2, value);
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rtc_update_irq(pcf8523->rtc, 1, RTC_IRQF | RTC_AF);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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static int pcf8523_stop_rtc(struct i2c_client *client)
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{
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u8 value;
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@ -257,6 +296,111 @@ static int pcf8523_rtc_set_time(struct device *dev, struct rtc_time *tm)
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return pcf8523_start_rtc(client);
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}
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static int pcf8523_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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u8 start = REG_MINUTE_ALARM, regs[4];
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struct i2c_msg msgs[2];
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u8 value;
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int err;
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msgs[0].addr = client->addr;
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msgs[0].flags = 0;
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msgs[0].len = 1;
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msgs[0].buf = &start;
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msgs[1].addr = client->addr;
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msgs[1].flags = I2C_M_RD;
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msgs[1].len = sizeof(regs);
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msgs[1].buf = regs;
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err = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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if (err < 0)
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return err;
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tm->time.tm_sec = 0;
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tm->time.tm_min = bcd2bin(regs[0] & 0x7F);
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tm->time.tm_hour = bcd2bin(regs[1] & 0x3F);
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tm->time.tm_mday = bcd2bin(regs[2] & 0x3F);
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tm->time.tm_wday = bcd2bin(regs[3] & 0x7);
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err = pcf8523_read(client, REG_CONTROL1, &value);
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if (err < 0)
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return err;
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tm->enabled = !!(value & REG_CONTROL1_AIE);
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err = pcf8523_read(client, REG_CONTROL2, &value);
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if (err < 0)
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return err;
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tm->pending = !!(value & REG_CONTROL2_AF);
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return 0;
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}
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static int pcf8523_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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u8 value;
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int err;
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err = pcf8523_read(client, REG_CONTROL1, &value);
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if (err < 0)
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return err;
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value &= REG_CONTROL1_AIE;
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if (enabled)
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value |= REG_CONTROL1_AIE;
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err = pcf8523_write(client, REG_CONTROL1, value);
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if (err < 0)
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return err;
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return 0;
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}
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static int pcf8523_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct i2c_msg msg;
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u8 regs[5];
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int err;
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err = pcf8523_irq_enable(dev, 0);
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if (err)
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return err;
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err = pcf8523_write(client, REG_CONTROL2, 0);
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if (err < 0)
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return err;
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/* The alarm has no seconds, round up to nearest minute */
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if (tm->time.tm_sec) {
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time64_t alarm_time = rtc_tm_to_time64(&tm->time);
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alarm_time += 60 - tm->time.tm_sec;
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rtc_time64_to_tm(alarm_time, &tm->time);
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}
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regs[0] = REG_MINUTE_ALARM;
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regs[1] = bin2bcd(tm->time.tm_min);
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regs[2] = bin2bcd(tm->time.tm_hour);
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regs[3] = bin2bcd(tm->time.tm_mday);
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regs[4] = ALARM_DIS;
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msg.addr = client->addr;
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msg.flags = 0;
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msg.len = sizeof(regs);
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msg.buf = regs;
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err = i2c_transfer(client->adapter, &msg, 1);
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if (err < 0)
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return err;
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if (tm->enabled)
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return pcf8523_irq_enable(dev, tm->enabled);
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return 0;
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}
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#ifdef CONFIG_RTC_INTF_DEV
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static int pcf8523_rtc_ioctl(struct device *dev, unsigned int cmd,
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unsigned long arg)
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@ -320,6 +464,9 @@ static int pcf8523_rtc_set_offset(struct device *dev, long offset)
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static const struct rtc_class_ops pcf8523_rtc_ops = {
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.read_time = pcf8523_rtc_read_time,
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.set_time = pcf8523_rtc_set_time,
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.read_alarm = pcf8523_rtc_read_alarm,
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.set_alarm = pcf8523_rtc_set_alarm,
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.alarm_irq_enable = pcf8523_irq_enable,
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.ioctl = pcf8523_rtc_ioctl,
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.read_offset = pcf8523_rtc_read_offset,
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.set_offset = pcf8523_rtc_set_offset,
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@ -328,12 +475,21 @@ static const struct rtc_class_ops pcf8523_rtc_ops = {
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static int pcf8523_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct pcf8523 *pcf8523;
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struct rtc_device *rtc;
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bool wakeup_source = false;
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int err;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
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return -ENODEV;
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pcf8523 = devm_kzalloc(&client->dev, sizeof(struct pcf8523), GFP_KERNEL);
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if (!pcf8523)
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return -ENOMEM;
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i2c_set_clientdata(client, pcf8523);
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pcf8523->client = client;
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err = pcf8523_load_capacitance(client);
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if (err < 0)
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dev_warn(&client->dev, "failed to set xtal load capacitance: %d",
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@ -347,9 +503,32 @@ static int pcf8523_probe(struct i2c_client *client,
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if (IS_ERR(rtc))
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return PTR_ERR(rtc);
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pcf8523->rtc = rtc;
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rtc->ops = &pcf8523_rtc_ops;
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rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
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rtc->range_max = RTC_TIMESTAMP_END_2099;
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rtc->uie_unsupported = 1;
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if (client->irq > 0) {
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err = pcf8523_write(client, REG_TMR_CLKOUT_CTRL, 0x38);
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if (err < 0)
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return err;
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err = devm_request_threaded_irq(&client->dev, client->irq,
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NULL, pcf8523_irq,
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IRQF_SHARED | IRQF_ONESHOT | IRQF_TRIGGER_LOW,
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dev_name(&rtc->dev), client);
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if (err)
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return err;
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dev_pm_set_wake_irq(&client->dev, client->irq);
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}
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#ifdef CONFIG_OF
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wakeup_source = of_property_read_bool(client->dev.of_node, "wakeup-source");
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#endif
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if (client->irq > 0 || wakeup_source)
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device_init_wakeup(&client->dev, true);
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return devm_rtc_register_device(rtc);
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}
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