Signed-off-by: Sean Nyekjaer <sean.nyekj...@prevas.dk>
---
drivers/rtc/Kconfig | 7 +++
drivers/rtc/rtc-pcf2127.c | 128 +++++++++++++++++++++++++++++++++++++++++++---
2 files changed, 129 insertions(+), 6 deletions(-)
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index c8985be81d83..e8d7944a4018 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -806,6 +806,13 @@ config RTC_DRV_PCF2127_WDT
If you say Y here you will get support for the
watchdog timer in the NXP PCF2127 chip real-time clock chips.
+config RTC_DRV_PCF2127_TAMPER
+ bool "NXP PCF2127 tamper"
+ depends on RTC_DRV_PCF2127
+ help
+ If you say Y here you will get support for the
+ tamper device in the NXP PCF2127 chip real-time clock chips.
+
config RTC_DRV_RV3029C2
tristate "Micro Crystal RV3029/3049"
depends on RTC_I2C_AND_SPI
diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
index 31627c59c44d..5f96cff9ebd5 100644
--- a/drivers/rtc/rtc-pcf2127.c
+++ b/drivers/rtc/rtc-pcf2127.c
@@ -30,7 +30,10 @@
#endif
#define PCF2127_REG_CTRL1 (0x00) /* Control Register 1 */
+#define PCF2127_TSF1 BIT(4)
#define PCF2127_REG_CTRL2 (0x01) /* Control Register 2 */
+#define PCF2127_TSIE BIT(2)
+#define PCF2127_TSF2 BIT(5)
#define PCF2127_REG_CTRL3 (0x02) /* Control Register 3 */
#define PCF2127_REG_CTRL3_BLF BIT(2)
@@ -42,6 +45,17 @@
#define PCF2127_REG_WDG_T_TF_1HZ BIT(1) /* Timer clock source */
#define PCF2127_REG_WDG_TIMVAL (0x11)
+#define PCF2127_REG_TIMSTP_CTL (0x12)
+#define PCF2127_TSM BIT(7)
+#define PCF2127_TSOFF BIT(6)
+
+#define PCF2127_REG_TIMSTP_SC (0x01)
+#define PCF2127_REG_TIMSTP_MN (0x02)
+#define PCF2127_REG_TIMSTP_HR (0x03)
+#define PCF2127_REG_TIMSTP_DM (0x04)
+#define PCF2127_REG_TIMSTP_MO (0x05)
+#define PCF2127_REG_TIMSTP_YR (0x06)
+
#define PCF2127_REG_SC (0x03) /* datetime */
#define PCF2127_REG_MN (0x04)
#define PCF2127_REG_HR (0x05)
@@ -55,10 +69,84 @@
struct pcf2127 {
struct rtc_device *rtc;
struct regmap *regmap;
+ struct rtc_time tamper_event;
+ bool tamper_enabled;
+ int irq;
};
-#ifdef CONFIG_RTC_DRV_PCF2127_WDT
+#if defined(CONFIG_RTC_DRV_PCF2127_TAMPER) ||
defined(CONFIG_RTC_DRV_PCF2127_WDT)
static struct pcf2127 *save_pcf2127;
+#endif
+
+#ifdef CONFIG_RTC_DRV_PCF2127_TAMPER
+static int pcf2127_tamper_event_print(struct device *dev)
+{
+ int err;
+ unsigned char buf[7];
+ struct rtc_time *tm;
+
+ err = regmap_bulk_read(save_pcf2127->regmap, PCF2127_REG_TIMSTP_CTL,
+ buf, sizeof(buf));
+ if (err)
+ return err;
+
+ tm = &save_pcf2127->tamper_event;
+
+ tm->tm_sec = bcd2bin(buf[PCF2127_REG_TIMSTP_SC] & 0x7F);
+ tm->tm_min = bcd2bin(buf[PCF2127_REG_TIMSTP_MN] & 0x7F);
+ tm->tm_hour = bcd2bin(buf[PCF2127_REG_TIMSTP_HR] & 0x3F);
+ tm->tm_mday = bcd2bin(buf[PCF2127_REG_TIMSTP_DM] & 0x3F);
+ tm->tm_mon = bcd2bin(buf[PCF2127_REG_TIMSTP_MO] & 0x1F) - 1;
+ tm->tm_year = bcd2bin(buf[PCF2127_REG_TIMSTP_YR]);
+
+ dev_emerg(dev, "%s: Tamper detected at secs=%d, mins=%d, hours=%d, "
+ "mday=%d, mon=%d, year=%d\n",
+ __func__,
+ tm->tm_sec, tm->tm_min, tm->tm_hour,
+ tm->tm_mday, tm->tm_mon, tm->tm_year);
+
+ return 0;
+}
+
+static int pcf2127_tamper_enable(void)
+{
+ int err;
+
+ /* Enable interrupt on tamper event */
+ err = regmap_write_bits(save_pcf2127->regmap, PCF2127_REG_CTRL2,
+ PCF2127_TSIE, PCF2127_TSIE);
+ if (err)
+ return err;
+
+ /* Enable timestamp function */
+ err = regmap_write_bits(save_pcf2127->regmap, PCF2127_REG_TIMSTP_CTL,
+ PCF2127_TSM | PCF2127_TSOFF, PCF2127_TSM);
+ if (err)
+ return err;
+
+ save_pcf2127->tamper_enabled = true;
+
+ return 0;
+}
+
+static irqreturn_t pcf2127_tamper_event_irq(int irq, void *data)
+{
+ struct device *dev = data;
+ struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
+
+ pcf2127_tamper_event_print(dev);
+
+ /* Clear interrupt pin */
+ regmap_write_bits(pcf2127->regmap, PCF2127_REG_CTRL1,
+ PCF2127_TSF1, 0);
+ regmap_write_bits(pcf2127->regmap, PCF2127_REG_CTRL2,
+ PCF2127_TSF2, 0);
+
+ return IRQ_HANDLED;
+}
+#endif
+
+#ifdef CONFIG_RTC_DRV_PCF2127_WDT
/* default 32 sec timeout */
#define WD_TIMO 32
@@ -219,6 +307,11 @@ static int pcf2127_rtc_read_time(struct device *dev,
struct rtc_time *tm)
"oscillator stop detected, date/time is not
reliable\n");
return -EINVAL;
}
+#ifdef CONFIG_RTC_DRV_PCF2127_TAMPER
+ if (buf[PCF2127_REG_CTRL1] & PCF2127_TSF1) {
+ pcf2127_tamper_event_print(dev);
+ }
+#endif
dev_dbg(dev,
"%s: raw data is cr1=%02x, cr2=%02x, cr3=%02x, "
@@ -319,9 +412,9 @@ static const struct rtc_class_ops pcf2127_rtc_ops = {
};
static int pcf2127_probe(struct device *dev, struct regmap *regmap,
- const char *name)
+ const char *name, int irq)
{
-#ifdef CONFIG_RTC_DRV_PCF2127_WDT
+#if defined(CONFIG_RTC_DRV_PCF2127_TAMPER) ||
defined(CONFIG_RTC_DRV_PCF2127_WDT)
int ret;
#endif
struct pcf2127 *pcf2127;
@@ -332,7 +425,7 @@ static int pcf2127_probe(struct device *dev, struct regmap
*regmap,
if (!pcf2127)
return -ENOMEM;
-#ifdef CONFIG_RTC_DRV_PCF2127_WDT
+#if defined(CONFIG_RTC_DRV_PCF2127_TAMPER) ||
defined(CONFIG_RTC_DRV_PCF2127_WDT)
save_pcf2127 = pcf2127;
#endif
@@ -358,6 +451,28 @@ static int pcf2127_probe(struct device *dev, struct regmap
*regmap,
pcf2127_wdt_settimeout(32);
#endif
+#ifdef CONFIG_RTC_DRV_PCF2127_TAMPER
+ pcf2127->tamper_enabled = false;
+
+ if (!of_device_is_compatible(dev->of_node, "nxp,pcf2127"))
+ return 0;
+
+ if (of_property_read_bool(dev->of_node, "tamper")) {
+ pcf2127_tamper_enable();
+
+ ret = devm_request_threaded_irq(dev, irq, NULL,
+ pcf2127_tamper_event_irq,
+ IRQF_ONESHOT |
IRQF_TRIGGER_FALLING, dev_name(dev),
+ dev);
+ if (ret < 0) {
+ dev_err(dev, "IRQ is not free.\n");
+ return ret;
+ }
+
+ pcf2127->irq = irq;
+ }
+#endif
+
return 0;
}
@@ -466,7 +581,7 @@ static int pcf2127_i2c_probe(struct i2c_client *client,
}
return pcf2127_probe(&client->dev, regmap,
- pcf2127_i2c_driver.driver.name);
+ pcf2127_i2c_driver.driver.name, client->irq);
}
static const struct i2c_device_id pcf2127_i2c_id[] = {
@@ -529,7 +644,8 @@ static int pcf2127_spi_probe(struct spi_device *spi)
return PTR_ERR(regmap);
}
- return pcf2127_probe(&spi->dev, regmap, pcf2127_spi_driver.driver.name);
+ return pcf2127_probe(&spi->dev, regmap, pcf2127_spi_driver.driver.name,
+ spi->irq);
}
static const struct spi_device_id pcf2127_spi_id[] = {
--
2.11.0
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