Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 266 insertions, 0 deletions

diff --git a/drivers/hwmon/ltc4261.c b/drivers/hwmon/ltc4261.c
new file mode 100644
index 000000000..0becd6984
--- /dev/null
+++ b/drivers/hwmon/ltc4261.c
@@ -0,0 +1,266 @@
+/*
+ * 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
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#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 = 0;
+				goto abort;
+			}
+			data->regs[i] = val;
+		}
+		data->last_updated = jiffies;
+		data->valid = 1;
+	}
+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_show_value(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 snprintf(buf, PAGE_SIZE, "%d\n", value);
+}
+
+static ssize_t ltc4261_show_bool(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 snprintf(buf, PAGE_SIZE, "%d\n", fault ? 1 : 0);
+}
+
+/*
+ * Input voltages.
+ */
+static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ltc4261_show_value, NULL,
+			  LTC4261_ADIN_H);
+static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, ltc4261_show_value, NULL,
+			  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(in1_min_alarm, S_IRUGO, ltc4261_show_bool, NULL,
+			  FAULT_UV);
+static SENSOR_DEVICE_ATTR(in1_max_alarm, S_IRUGO, ltc4261_show_bool, NULL,
+			  FAULT_OV);
+static SENSOR_DEVICE_ATTR(in2_min_alarm, S_IRUGO, ltc4261_show_bool, NULL,
+			  FAULT_UV);
+static SENSOR_DEVICE_ATTR(in2_max_alarm, S_IRUGO, ltc4261_show_bool, NULL,
+			  FAULT_OV);
+
+/* Currents (via sense resistor) */
+static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ltc4261_show_value, NULL,
+			  LTC4261_SENSE_H);
+
+/* Overcurrent alarm */
+static SENSOR_DEVICE_ATTR(curr1_max_alarm, S_IRUGO, ltc4261_show_bool, NULL,
+			  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,
+			 const struct i2c_device_id *id)
+{
+	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 = 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");