Implement support for using the values given in the
isil,battery-trip-levels-microvolt property to set appropriate values
in the VB85TP/VB75TP bits in the PWR_VBAT register.
Signed-off-by: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
---
drivers/rtc/rtc-isl12022.c | 39 ++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/drivers/rtc/rtc-isl12022.c b/drivers/rtc/rtc-isl12022.c
index ebd66b835cef..6a757f0a4736 100644
--- a/drivers/rtc/rtc-isl12022.c
+++ b/drivers/rtc/rtc-isl12022.c
@@ -9,6 +9,7 @@
*/
#include <linux/bcd.h>
+#include <linux/bitfield.h>
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/i2c.h>
@@ -31,6 +32,8 @@
#define ISL12022_REG_SR 0x07
#define ISL12022_REG_INT 0x08
+#define ISL12022_REG_PWR_VBAT 0x0a
+
#define ISL12022_REG_BETA 0x0d
#define ISL12022_REG_TEMP_L 0x28
@@ -42,6 +45,9 @@
#define ISL12022_INT_WRTC (1 << 6)
+#define ISL12022_REG_VB85_MASK GENMASK(5, 3)
+#define ISL12022_REG_VB75_MASK GENMASK(2, 0)
+
#define ISL12022_BETA_TSE (1 << 7)
static umode_t isl12022_hwmon_is_visible(const void *data,
@@ -209,6 +215,38 @@ static const struct regmap_config regmap_config = {
.use_single_write = true,
};
+static const u32 trip_levels[2][7] = {
+ { 2125000, 2295000, 2550000, 2805000, 3060000, 4250000, 4675000 },
+ { 1875000, 2025000, 2250000, 2475000, 2700000, 3750000, 4125000 },
+};
+
+static void isl12022_set_trip_levels(struct device *dev)
+{
+ struct regmap *regmap = dev_get_drvdata(dev);
+ u32 levels[2] = {0, 0};
+ int ret, i, j, x[2];
+ u8 val, mask;
+
+ device_property_read_u32_array(dev, "isil,battery-trip-levels-microvolt",
+ levels, 2);
+
+ for (i = 0; i < 2; i++) {
+ for (j = 0; j < ARRAY_SIZE(trip_levels[i]) - 1; j++) {
+ if (levels[i] <= trip_levels[i][j])
+ break;
+ }
+ x[i] = j;
+ }
+
+ val = FIELD_PREP(ISL12022_REG_VB85_MASK, x[0]) |
+ FIELD_PREP(ISL12022_REG_VB75_MASK, x[1]);
+ mask = ISL12022_REG_VB85_MASK | ISL12022_REG_VB75_MASK;
+
+ ret = regmap_update_bits(regmap, ISL12022_REG_PWR_VBAT, mask, val);
+ if (ret)
+ dev_warn(dev, "unable to set battery alarm levels: %d\n", ret);
+}
+
static int isl12022_probe(struct i2c_client *client)
{
struct rtc_device *rtc;
@@ -225,6 +263,7 @@ static int isl12022_probe(struct i2c_client *client)
dev_set_drvdata(&client->dev, regmap);
+ isl12022_set_trip_levels(&client->dev);
isl12022_hwmon_register(&client->dev);
rtc = devm_rtc_allocate_device(&client->dev);
--
2.37.2
