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authorDaniel Matyas <daniel.matyas@analog.com>2023-10-31 21:21:53 +0300
committerGuenter Roeck <linux@roeck-us.net>2023-12-11 17:42:36 +0300
commit88548710d2aed71677f7594a78219bf081d4297f (patch)
tree9e1ff7995185129e284ca92a79d5e16e38e1a96c /drivers/hwmon
parentb449879243dbd141b5a50ecb4a312ab87d313390 (diff)
downloadlinux-88548710d2aed71677f7594a78219bf081d4297f.tar.xz
hwmon: (max31827) Handle new properties from the devicetree
Used fwnode to retrieve data from the devicetree in the init_client function. If the uint32 properties are not present, the default values are used for max31827 chip. Signed-off-by: Daniel Matyas <daniel.matyas@analog.com> Link: https://lore.kernel.org/r/20231031182158.124608-1-daniel.matyas@analog.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/max31827.c75
1 files changed, 69 insertions, 6 deletions
diff --git a/drivers/hwmon/max31827.c b/drivers/hwmon/max31827.c
index a1ce65145669..3f1312b555ab 100644
--- a/drivers/hwmon/max31827.c
+++ b/drivers/hwmon/max31827.c
@@ -11,6 +11,7 @@
#include <linux/hwmon.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
+#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
@@ -23,9 +24,17 @@
#define MAX31827_CONFIGURATION_1SHOT_MASK BIT(0)
#define MAX31827_CONFIGURATION_CNV_RATE_MASK GENMASK(3, 1)
+#define MAX31827_CONFIGURATION_TIMEOUT_MASK BIT(5)
+#define MAX31827_CONFIGURATION_RESOLUTION_MASK GENMASK(7, 6)
+#define MAX31827_CONFIGURATION_ALRM_POL_MASK BIT(8)
+#define MAX31827_CONFIGURATION_COMP_INT_MASK BIT(9)
+#define MAX31827_CONFIGURATION_FLT_Q_MASK GENMASK(11, 10)
#define MAX31827_CONFIGURATION_U_TEMP_STAT_MASK BIT(14)
#define MAX31827_CONFIGURATION_O_TEMP_STAT_MASK BIT(15)
+#define MAX31827_ALRM_POL_LOW 0x0
+#define MAX31827_FLT_Q_1 0x0
+
#define MAX31827_12_BIT_CNV_TIME 140
#define MAX31827_16_BIT_TO_M_DGR(x) (sign_extend32(x, 15) * 1000 / 16)
@@ -362,14 +371,68 @@ static int max31827_write(struct device *dev, enum hwmon_sensor_types type,
return -EOPNOTSUPP;
}
-static int max31827_init_client(struct max31827_state *st)
+static int max31827_init_client(struct max31827_state *st,
+ struct device *dev)
{
+ struct fwnode_handle *fwnode;
+ unsigned int res = 0;
+ u32 data, lsb_idx;
+ bool prop;
+ int ret;
+
+ fwnode = dev_fwnode(dev);
+
st->enable = true;
+ res |= MAX31827_DEVICE_ENABLE(1);
+
+ res |= MAX31827_CONFIGURATION_RESOLUTION_MASK;
+
+ prop = fwnode_property_read_bool(fwnode, "adi,comp-int");
+ res |= FIELD_PREP(MAX31827_CONFIGURATION_COMP_INT_MASK, prop);
+
+ prop = fwnode_property_read_bool(fwnode, "adi,timeout-enable");
+ res |= FIELD_PREP(MAX31827_CONFIGURATION_TIMEOUT_MASK, !prop);
+
+ if (fwnode_property_present(fwnode, "adi,alarm-pol")) {
+ ret = fwnode_property_read_u32(fwnode, "adi,alarm-pol", &data);
+ if (ret)
+ return ret;
+
+ res |= FIELD_PREP(MAX31827_CONFIGURATION_ALRM_POL_MASK, !!data);
+ } else {
+ /*
+ * Set default value.
+ */
+ res |= FIELD_PREP(MAX31827_CONFIGURATION_ALRM_POL_MASK,
+ MAX31827_ALRM_POL_LOW);
+ }
+
+ if (fwnode_property_present(fwnode, "adi,fault-q")) {
+ ret = fwnode_property_read_u32(fwnode, "adi,fault-q", &data);
+ if (ret)
+ return ret;
+
+ /*
+ * Convert the desired fault queue into register bits.
+ */
+ if (data != 0)
+ lsb_idx = __ffs(data);
+
+ if (hweight32(data) != 1 || lsb_idx > 4) {
+ dev_err(dev, "Invalid data in adi,fault-q\n");
+ return -EINVAL;
+ }
+
+ res |= FIELD_PREP(MAX31827_CONFIGURATION_FLT_Q_MASK, lsb_idx);
+ } else {
+ /*
+ * Set default value.
+ */
+ res |= FIELD_PREP(MAX31827_CONFIGURATION_FLT_Q_MASK,
+ MAX31827_FLT_Q_1);
+ }
- return regmap_update_bits(st->regmap, MAX31827_CONFIGURATION_REG,
- MAX31827_CONFIGURATION_1SHOT_MASK |
- MAX31827_CONFIGURATION_CNV_RATE_MASK,
- MAX31827_DEVICE_ENABLE(1));
+ return regmap_write(st->regmap, MAX31827_CONFIGURATION_REG, res);
}
static const struct hwmon_channel_info *max31827_info[] = {
@@ -417,7 +480,7 @@ static int max31827_probe(struct i2c_client *client)
if (err)
return dev_err_probe(dev, err, "failed to enable regulator\n");
- err = max31827_init_client(st);
+ err = max31827_init_client(st, dev);
if (err)
return err;