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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/hwmon/ltc4261.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/hwmon/ltc4261.c')
-rw-r--r--drivers/hwmon/ltc4261.c244
1 files changed, 244 insertions, 0 deletions
diff --git a/drivers/hwmon/ltc4261.c b/drivers/hwmon/ltc4261.c
new file mode 100644
index 000000000..b91cc4fe8
--- /dev/null
+++ b/drivers/hwmon/ltc4261.c
@@ -0,0 +1,244 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Linear Technology LTC4261 I2C Negative Voltage Hot Swap Controller
+ *
+ * Copyright (C) 2010 Ericsson AB.
+ *
+ * Derived from:
+ *
+ * Driver for Linear Technology LTC4245 I2C Multiple Supply Hot Swap Controller
+ * Copyright (C) 2008 Ira W. Snyder <iws@ovro.caltech.edu>
+ *
+ * Datasheet: http://cds.linear.com/docs/Datasheet/42612fb.pdf
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/jiffies.h>
+
+/* chip registers */
+#define LTC4261_STATUS 0x00 /* readonly */
+#define LTC4261_FAULT 0x01
+#define LTC4261_ALERT 0x02
+#define LTC4261_CONTROL 0x03
+#define LTC4261_SENSE_H 0x04
+#define LTC4261_SENSE_L 0x05
+#define LTC4261_ADIN2_H 0x06
+#define LTC4261_ADIN2_L 0x07
+#define LTC4261_ADIN_H 0x08
+#define LTC4261_ADIN_L 0x09
+
+/*
+ * Fault register bits
+ */
+#define FAULT_OV (1<<0)
+#define FAULT_UV (1<<1)
+#define FAULT_OC (1<<2)
+
+struct ltc4261_data {
+ struct i2c_client *client;
+
+ struct mutex update_lock;
+ bool valid;
+ unsigned long last_updated; /* in jiffies */
+
+ /* Registers */
+ u8 regs[10];
+};
+
+static struct ltc4261_data *ltc4261_update_device(struct device *dev)
+{
+ struct ltc4261_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ struct ltc4261_data *ret = data;
+
+ mutex_lock(&data->update_lock);
+
+ if (time_after(jiffies, data->last_updated + HZ / 4) || !data->valid) {
+ int i;
+
+ /* Read registers -- 0x00 to 0x09 */
+ for (i = 0; i < ARRAY_SIZE(data->regs); i++) {
+ int val;
+
+ val = i2c_smbus_read_byte_data(client, i);
+ if (unlikely(val < 0)) {
+ dev_dbg(dev,
+ "Failed to read ADC value: error %d\n",
+ val);
+ ret = ERR_PTR(val);
+ data->valid = false;
+ goto abort;
+ }
+ data->regs[i] = val;
+ }
+ data->last_updated = jiffies;
+ data->valid = true;
+ }
+abort:
+ mutex_unlock(&data->update_lock);
+ return ret;
+}
+
+/* Return the voltage from the given register in mV or mA */
+static int ltc4261_get_value(struct ltc4261_data *data, u8 reg)
+{
+ u32 val;
+
+ val = (data->regs[reg] << 2) + (data->regs[reg + 1] >> 6);
+
+ switch (reg) {
+ case LTC4261_ADIN_H:
+ case LTC4261_ADIN2_H:
+ /* 2.5mV resolution. Convert to mV. */
+ val = val * 25 / 10;
+ break;
+ case LTC4261_SENSE_H:
+ /*
+ * 62.5uV resolution. Convert to current as measured with
+ * an 1 mOhm sense resistor, in mA. If a different sense
+ * resistor is installed, calculate the actual current by
+ * dividing the reported current by the sense resistor value
+ * in mOhm.
+ */
+ val = val * 625 / 10;
+ break;
+ default:
+ /* If we get here, the developer messed up */
+ WARN_ON_ONCE(1);
+ val = 0;
+ break;
+ }
+
+ return val;
+}
+
+static ssize_t ltc4261_value_show(struct device *dev,
+ struct device_attribute *da, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct ltc4261_data *data = ltc4261_update_device(dev);
+ int value;
+
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ value = ltc4261_get_value(data, attr->index);
+ return sysfs_emit(buf, "%d\n", value);
+}
+
+static ssize_t ltc4261_bool_show(struct device *dev,
+ struct device_attribute *da, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct ltc4261_data *data = ltc4261_update_device(dev);
+ u8 fault;
+
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ fault = data->regs[LTC4261_FAULT] & attr->index;
+ if (fault) /* Clear reported faults in chip register */
+ i2c_smbus_write_byte_data(data->client, LTC4261_FAULT, ~fault);
+
+ return sysfs_emit(buf, "%d\n", fault ? 1 : 0);
+}
+
+/*
+ * Input voltages.
+ */
+static SENSOR_DEVICE_ATTR_RO(in1_input, ltc4261_value, LTC4261_ADIN_H);
+static SENSOR_DEVICE_ATTR_RO(in2_input, ltc4261_value, LTC4261_ADIN2_H);
+
+/*
+ * Voltage alarms. The chip has only one set of voltage alarm status bits,
+ * triggered by input voltage alarms. In many designs, those alarms are
+ * associated with the ADIN2 sensor, due to the proximity of the ADIN2 pin
+ * to the OV pin. ADIN2 is, however, not available on all chip variants.
+ * To ensure that the alarm condition is reported to the user, report it
+ * with both voltage sensors.
+ */
+static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ltc4261_bool, FAULT_UV);
+static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ltc4261_bool, FAULT_OV);
+static SENSOR_DEVICE_ATTR_RO(in2_min_alarm, ltc4261_bool, FAULT_UV);
+static SENSOR_DEVICE_ATTR_RO(in2_max_alarm, ltc4261_bool, FAULT_OV);
+
+/* Currents (via sense resistor) */
+static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc4261_value, LTC4261_SENSE_H);
+
+/* Overcurrent alarm */
+static SENSOR_DEVICE_ATTR_RO(curr1_max_alarm, ltc4261_bool, FAULT_OC);
+
+static struct attribute *ltc4261_attrs[] = {
+ &sensor_dev_attr_in1_input.dev_attr.attr,
+ &sensor_dev_attr_in1_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_in1_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_in2_input.dev_attr.attr,
+ &sensor_dev_attr_in2_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_in2_max_alarm.dev_attr.attr,
+
+ &sensor_dev_attr_curr1_input.dev_attr.attr,
+ &sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
+
+ NULL,
+};
+ATTRIBUTE_GROUPS(ltc4261);
+
+static int ltc4261_probe(struct i2c_client *client)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ struct device *dev = &client->dev;
+ struct ltc4261_data *data;
+ struct device *hwmon_dev;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ if (i2c_smbus_read_byte_data(client, LTC4261_STATUS) < 0) {
+ dev_err(dev, "Failed to read status register\n");
+ return -ENODEV;
+ }
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->client = client;
+ mutex_init(&data->update_lock);
+
+ /* Clear faults */
+ i2c_smbus_write_byte_data(client, LTC4261_FAULT, 0x00);
+
+ hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
+ data,
+ ltc4261_groups);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct i2c_device_id ltc4261_id[] = {
+ {"ltc4261", 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, ltc4261_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver ltc4261_driver = {
+ .driver = {
+ .name = "ltc4261",
+ },
+ .probe_new = ltc4261_probe,
+ .id_table = ltc4261_id,
+};
+
+module_i2c_driver(ltc4261_driver);
+
+MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
+MODULE_DESCRIPTION("LTC4261 driver");
+MODULE_LICENSE("GPL");