1 files changed, 466 insertions, 0 deletions

diff --git a/drivers/hwmon/emc1403.c b/drivers/hwmon/emc1403.c
new file mode 100644
index 000000000..61d59189a
--- /dev/null
+++ b/drivers/hwmon/emc1403.c
@@ -0,0 +1,466 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * emc1403.c - SMSC Thermal Driver
+ *
+ * Copyright (C) 2008 Intel Corp
+ *
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/sysfs.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+
+#define THERMAL_PID_REG		0xfd
+#define THERMAL_SMSC_ID_REG	0xfe
+#define THERMAL_REVISION_REG	0xff
+
+enum emc1403_chip { emc1402, emc1403, emc1404 };
+
+struct thermal_data {
+	struct regmap *regmap;
+	struct mutex mutex;
+	const struct attribute_group *groups[4];
+};
+
+static ssize_t temp_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
+	struct thermal_data *data = dev_get_drvdata(dev);
+	unsigned int val;
+	int retval;
+
+	retval = regmap_read(data->regmap, sda->index, &val);
+	if (retval < 0)
+		return retval;
+	return sprintf(buf, "%d000\n", val);
+}
+
+static ssize_t bit_show(struct device *dev, struct device_attribute *attr,
+			char *buf)
+{
+	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
+	struct thermal_data *data = dev_get_drvdata(dev);
+	unsigned int val;
+	int retval;
+
+	retval = regmap_read(data->regmap, sda->nr, &val);
+	if (retval < 0)
+		return retval;
+	return sprintf(buf, "%d\n", !!(val & sda->index));
+}
+
+static ssize_t temp_store(struct device *dev, struct device_attribute *attr,
+			  const char *buf, size_t count)
+{
+	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
+	struct thermal_data *data = dev_get_drvdata(dev);
+	unsigned long val;
+	int retval;
+
+	if (kstrtoul(buf, 10, &val))
+		return -EINVAL;
+	retval = regmap_write(data->regmap, sda->index,
+			      DIV_ROUND_CLOSEST(val, 1000));
+	if (retval < 0)
+		return retval;
+	return count;
+}
+
+static ssize_t bit_store(struct device *dev, struct device_attribute *attr,
+			 const char *buf, size_t count)
+{
+	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
+	struct thermal_data *data = dev_get_drvdata(dev);
+	unsigned long val;
+	int retval;
+
+	if (kstrtoul(buf, 10, &val))
+		return -EINVAL;
+
+	retval = regmap_update_bits(data->regmap, sda->nr, sda->index,
+				    val ? sda->index : 0);
+	if (retval < 0)
+		return retval;
+	return count;
+}
+
+static ssize_t show_hyst_common(struct device *dev,
+				struct device_attribute *attr, char *buf,
+				bool is_min)
+{
+	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
+	struct thermal_data *data = dev_get_drvdata(dev);
+	struct regmap *regmap = data->regmap;
+	unsigned int limit;
+	unsigned int hyst;
+	int retval;
+
+	retval = regmap_read(regmap, sda->index, &limit);
+	if (retval < 0)
+		return retval;
+
+	retval = regmap_read(regmap, 0x21, &hyst);
+	if (retval < 0)
+		return retval;
+
+	return sprintf(buf, "%d000\n", is_min ? limit + hyst : limit - hyst);
+}
+
+static ssize_t hyst_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	return show_hyst_common(dev, attr, buf, false);
+}
+
+static ssize_t min_hyst_show(struct device *dev,
+			     struct device_attribute *attr, char *buf)
+{
+	return show_hyst_common(dev, attr, buf, true);
+}
+
+static ssize_t hyst_store(struct device *dev, struct device_attribute *attr,
+			  const char *buf, size_t count)
+{
+	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
+	struct thermal_data *data = dev_get_drvdata(dev);
+	struct regmap *regmap = data->regmap;
+	unsigned int limit;
+	int retval;
+	int hyst;
+	unsigned long val;
+
+	if (kstrtoul(buf, 10, &val))
+		return -EINVAL;
+
+	mutex_lock(&data->mutex);
+	retval = regmap_read(regmap, sda->index, &limit);
+	if (retval < 0)
+		goto fail;
+
+	hyst = limit * 1000 - val;
+	hyst = clamp_val(DIV_ROUND_CLOSEST(hyst, 1000), 0, 255);
+	retval = regmap_write(regmap, 0x21, hyst);
+	if (retval == 0)
+		retval = count;
+fail:
+	mutex_unlock(&data->mutex);
+	return retval;
+}
+
+/*
+ *	Sensors. We pass the actual i2c register to the methods.
+ */
+
+static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, 0x06);
+static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 0x05);
+static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, 0x20);
+static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0x00);
+static SENSOR_DEVICE_ATTR_2_RO(temp1_min_alarm, bit, 0x36, 0x01);
+static SENSOR_DEVICE_ATTR_2_RO(temp1_max_alarm, bit, 0x35, 0x01);
+static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, bit, 0x37, 0x01);
+static SENSOR_DEVICE_ATTR_RO(temp1_min_hyst, min_hyst, 0x06);
+static SENSOR_DEVICE_ATTR_RO(temp1_max_hyst, hyst, 0x05);
+static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, hyst, 0x20);
+
+static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, 0x08);
+static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, 0x07);
+static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, 0x19);
+static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 0x01);
+static SENSOR_DEVICE_ATTR_2_RO(temp2_fault, bit, 0x1b, 0x02);
+static SENSOR_DEVICE_ATTR_2_RO(temp2_min_alarm, bit, 0x36, 0x02);
+static SENSOR_DEVICE_ATTR_2_RO(temp2_max_alarm, bit, 0x35, 0x02);
+static SENSOR_DEVICE_ATTR_2_RO(temp2_crit_alarm, bit, 0x37, 0x02);
+static SENSOR_DEVICE_ATTR_RO(temp2_min_hyst, min_hyst, 0x08);
+static SENSOR_DEVICE_ATTR_RO(temp2_max_hyst, hyst, 0x07);
+static SENSOR_DEVICE_ATTR_RO(temp2_crit_hyst, hyst, 0x19);
+
+static SENSOR_DEVICE_ATTR_RW(temp3_min, temp, 0x16);
+static SENSOR_DEVICE_ATTR_RW(temp3_max, temp, 0x15);
+static SENSOR_DEVICE_ATTR_RW(temp3_crit, temp, 0x1A);
+static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 0x23);
+static SENSOR_DEVICE_ATTR_2_RO(temp3_fault, bit, 0x1b, 0x04);
+static SENSOR_DEVICE_ATTR_2_RO(temp3_min_alarm, bit, 0x36, 0x04);
+static SENSOR_DEVICE_ATTR_2_RO(temp3_max_alarm, bit, 0x35, 0x04);
+static SENSOR_DEVICE_ATTR_2_RO(temp3_crit_alarm, bit, 0x37, 0x04);
+static SENSOR_DEVICE_ATTR_RO(temp3_min_hyst, min_hyst, 0x16);
+static SENSOR_DEVICE_ATTR_RO(temp3_max_hyst, hyst, 0x15);
+static SENSOR_DEVICE_ATTR_RO(temp3_crit_hyst, hyst, 0x1A);
+
+static SENSOR_DEVICE_ATTR_RW(temp4_min, temp, 0x2D);
+static SENSOR_DEVICE_ATTR_RW(temp4_max, temp, 0x2C);
+static SENSOR_DEVICE_ATTR_RW(temp4_crit, temp, 0x30);
+static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 0x2A);
+static SENSOR_DEVICE_ATTR_2_RO(temp4_fault, bit, 0x1b, 0x08);
+static SENSOR_DEVICE_ATTR_2_RO(temp4_min_alarm, bit, 0x36, 0x08);
+static SENSOR_DEVICE_ATTR_2_RO(temp4_max_alarm, bit, 0x35, 0x08);
+static SENSOR_DEVICE_ATTR_2_RO(temp4_crit_alarm, bit, 0x37, 0x08);
+static SENSOR_DEVICE_ATTR_RO(temp4_min_hyst, min_hyst, 0x2D);
+static SENSOR_DEVICE_ATTR_RO(temp4_max_hyst, hyst, 0x2C);
+static SENSOR_DEVICE_ATTR_RO(temp4_crit_hyst, hyst, 0x30);
+
+static SENSOR_DEVICE_ATTR_2_RW(power_state, bit, 0x03, 0x40);
+
+static struct attribute *emc1402_attrs[] = {
+	&sensor_dev_attr_temp1_min.dev_attr.attr,
+	&sensor_dev_attr_temp1_max.dev_attr.attr,
+	&sensor_dev_attr_temp1_crit.dev_attr.attr,
+	&sensor_dev_attr_temp1_input.dev_attr.attr,
+	&sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
+	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
+	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
+
+	&sensor_dev_attr_temp2_min.dev_attr.attr,
+	&sensor_dev_attr_temp2_max.dev_attr.attr,
+	&sensor_dev_attr_temp2_crit.dev_attr.attr,
+	&sensor_dev_attr_temp2_input.dev_attr.attr,
+	&sensor_dev_attr_temp2_min_hyst.dev_attr.attr,
+	&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
+	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
+
+	&sensor_dev_attr_power_state.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group emc1402_group = {
+		.attrs = emc1402_attrs,
+};
+
+static struct attribute *emc1403_attrs[] = {
+	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
+
+	&sensor_dev_attr_temp2_fault.dev_attr.attr,
+	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
+
+	&sensor_dev_attr_temp3_min.dev_attr.attr,
+	&sensor_dev_attr_temp3_max.dev_attr.attr,
+	&sensor_dev_attr_temp3_crit.dev_attr.attr,
+	&sensor_dev_attr_temp3_input.dev_attr.attr,
+	&sensor_dev_attr_temp3_fault.dev_attr.attr,
+	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp3_min_hyst.dev_attr.attr,
+	&sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
+	&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group emc1403_group = {
+	.attrs = emc1403_attrs,
+};
+
+static struct attribute *emc1404_attrs[] = {
+	&sensor_dev_attr_temp4_min.dev_attr.attr,
+	&sensor_dev_attr_temp4_max.dev_attr.attr,
+	&sensor_dev_attr_temp4_crit.dev_attr.attr,
+	&sensor_dev_attr_temp4_input.dev_attr.attr,
+	&sensor_dev_attr_temp4_fault.dev_attr.attr,
+	&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp4_min_hyst.dev_attr.attr,
+	&sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
+	&sensor_dev_attr_temp4_crit_hyst.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group emc1404_group = {
+	.attrs = emc1404_attrs,
+};
+
+/*
+ * EMC14x2 uses a different register and different bits to report alarm and
+ * fault status. For simplicity, provide a separate attribute group for this
+ * chip series.
+ * Since we can not re-use the same attribute names, create a separate attribute
+ * array.
+ */
+static struct sensor_device_attribute_2 emc1402_alarms[] = {
+	SENSOR_ATTR_2_RO(temp1_min_alarm, bit, 0x02, 0x20),
+	SENSOR_ATTR_2_RO(temp1_max_alarm, bit, 0x02, 0x40),
+	SENSOR_ATTR_2_RO(temp1_crit_alarm, bit, 0x02, 0x01),
+
+	SENSOR_ATTR_2_RO(temp2_fault, bit, 0x02, 0x04),
+	SENSOR_ATTR_2_RO(temp2_min_alarm, bit, 0x02, 0x08),
+	SENSOR_ATTR_2_RO(temp2_max_alarm, bit, 0x02, 0x10),
+	SENSOR_ATTR_2_RO(temp2_crit_alarm, bit, 0x02, 0x02),
+};
+
+static struct attribute *emc1402_alarm_attrs[] = {
+	&emc1402_alarms[0].dev_attr.attr,
+	&emc1402_alarms[1].dev_attr.attr,
+	&emc1402_alarms[2].dev_attr.attr,
+	&emc1402_alarms[3].dev_attr.attr,
+	&emc1402_alarms[4].dev_attr.attr,
+	&emc1402_alarms[5].dev_attr.attr,
+	&emc1402_alarms[6].dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group emc1402_alarm_group = {
+	.attrs = emc1402_alarm_attrs,
+};
+
+static int emc1403_detect(struct i2c_client *client,
+			struct i2c_board_info *info)
+{
+	int id;
+	/* Check if thermal chip is SMSC and EMC1403 or EMC1423 */
+
+	id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
+	if (id != 0x5d)
+		return -ENODEV;
+
+	id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
+	switch (id) {
+	case 0x20:
+		strscpy(info->type, "emc1402", I2C_NAME_SIZE);
+		break;
+	case 0x21:
+		strscpy(info->type, "emc1403", I2C_NAME_SIZE);
+		break;
+	case 0x22:
+		strscpy(info->type, "emc1422", I2C_NAME_SIZE);
+		break;
+	case 0x23:
+		strscpy(info->type, "emc1423", I2C_NAME_SIZE);
+		break;
+	case 0x25:
+		strscpy(info->type, "emc1404", I2C_NAME_SIZE);
+		break;
+	case 0x27:
+		strscpy(info->type, "emc1424", I2C_NAME_SIZE);
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
+	if (id < 0x01 || id > 0x04)
+		return -ENODEV;
+
+	return 0;
+}
+
+static bool emc1403_regmap_is_volatile(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case 0x00:	/* internal diode high byte */
+	case 0x01:	/* external diode 1 high byte */
+	case 0x02:	/* status */
+	case 0x10:	/* external diode 1 low byte */
+	case 0x1b:	/* external diode fault */
+	case 0x23:	/* external diode 2 high byte */
+	case 0x24:	/* external diode 2 low byte */
+	case 0x29:	/* internal diode low byte */
+	case 0x2a:	/* externl diode 3 high byte */
+	case 0x2b:	/* external diode 3 low byte */
+	case 0x35:	/* high limit status */
+	case 0x36:	/* low limit status */
+	case 0x37:	/* therm limit status */
+		return true;
+	default:
+		return false;
+	}
+}
+
+static const struct regmap_config emc1403_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.cache_type = REGCACHE_RBTREE,
+	.volatile_reg = emc1403_regmap_is_volatile,
+};
+
+static const struct i2c_device_id emc1403_idtable[];
+
+static int emc1403_probe(struct i2c_client *client)
+{
+	struct thermal_data *data;
+	struct device *hwmon_dev;
+	const struct i2c_device_id *id = i2c_match_id(emc1403_idtable, client);
+
+	data = devm_kzalloc(&client->dev, sizeof(struct thermal_data),
+			    GFP_KERNEL);
+	if (data == NULL)
+		return -ENOMEM;
+
+	data->regmap = devm_regmap_init_i2c(client, &emc1403_regmap_config);
+	if (IS_ERR(data->regmap))
+		return PTR_ERR(data->regmap);
+
+	mutex_init(&data->mutex);
+
+	switch (id->driver_data) {
+	case emc1404:
+		data->groups[2] = &emc1404_group;
+		fallthrough;
+	case emc1403:
+		data->groups[1] = &emc1403_group;
+		fallthrough;
+	case emc1402:
+		data->groups[0] = &emc1402_group;
+	}
+
+	if (id->driver_data == emc1402)
+		data->groups[1] = &emc1402_alarm_group;
+
+	hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
+							   client->name, data,
+							   data->groups);
+	if (IS_ERR(hwmon_dev))
+		return PTR_ERR(hwmon_dev);
+
+	dev_info(&client->dev, "%s Thermal chip found\n", id->name);
+	return 0;
+}
+
+static const unsigned short emc1403_address_list[] = {
+	0x18, 0x1c, 0x29, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
+};
+
+/* Last digit of chip name indicates number of channels */
+static const struct i2c_device_id emc1403_idtable[] = {
+	{ "emc1402", emc1402 },
+	{ "emc1403", emc1403 },
+	{ "emc1404", emc1404 },
+	{ "emc1412", emc1402 },
+	{ "emc1413", emc1403 },
+	{ "emc1414", emc1404 },
+	{ "emc1422", emc1402 },
+	{ "emc1423", emc1403 },
+	{ "emc1424", emc1404 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
+
+static struct i2c_driver sensor_emc1403 = {
+	.class = I2C_CLASS_HWMON,
+	.driver = {
+		.name = "emc1403",
+	},
+	.detect = emc1403_detect,
+	.probe_new = emc1403_probe,
+	.id_table = emc1403_idtable,
+	.address_list = emc1403_address_list,
+};
+
+module_i2c_driver(sensor_emc1403);
+
+MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
+MODULE_DESCRIPTION("emc1403 Thermal Driver");
+MODULE_LICENSE("GPL v2");