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-rw-r--r--drivers/hwmon/emc6w201.c487
1 files changed, 487 insertions, 0 deletions
diff --git a/drivers/hwmon/emc6w201.c b/drivers/hwmon/emc6w201.c
new file mode 100644
index 000000000..bcd93f0fe
--- /dev/null
+++ b/drivers/hwmon/emc6w201.c
@@ -0,0 +1,487 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * emc6w201.c - Hardware monitoring driver for the SMSC EMC6W201
+ * Copyright (C) 2011 Jean Delvare <jdelvare@suse.de>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+
+/*
+ * Addresses to scan
+ */
+
+static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
+
+/*
+ * The EMC6W201 registers
+ */
+
+#define EMC6W201_REG_IN(nr) (0x20 + (nr))
+#define EMC6W201_REG_TEMP(nr) (0x26 + (nr))
+#define EMC6W201_REG_FAN(nr) (0x2C + (nr) * 2)
+#define EMC6W201_REG_COMPANY 0x3E
+#define EMC6W201_REG_VERSTEP 0x3F
+#define EMC6W201_REG_CONFIG 0x40
+#define EMC6W201_REG_IN_LOW(nr) (0x4A + (nr) * 2)
+#define EMC6W201_REG_IN_HIGH(nr) (0x4B + (nr) * 2)
+#define EMC6W201_REG_TEMP_LOW(nr) (0x56 + (nr) * 2)
+#define EMC6W201_REG_TEMP_HIGH(nr) (0x57 + (nr) * 2)
+#define EMC6W201_REG_FAN_MIN(nr) (0x62 + (nr) * 2)
+
+enum subfeature { input, min, max };
+
+/*
+ * Per-device data
+ */
+
+struct emc6w201_data {
+ struct i2c_client *client;
+ struct mutex update_lock;
+ bool valid; /* false until following fields are valid */
+ unsigned long last_updated; /* in jiffies */
+
+ /* registers values */
+ u8 in[3][6];
+ s8 temp[3][6];
+ u16 fan[2][5];
+};
+
+/*
+ * Combine LSB and MSB registers in a single value
+ * Locking: must be called with data->update_lock held
+ */
+static u16 emc6w201_read16(struct i2c_client *client, u8 reg)
+{
+ int lsb, msb;
+
+ lsb = i2c_smbus_read_byte_data(client, reg);
+ msb = i2c_smbus_read_byte_data(client, reg + 1);
+ if (unlikely(lsb < 0 || msb < 0)) {
+ dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
+ 16, "read", reg);
+ return 0xFFFF; /* Arbitrary value */
+ }
+
+ return (msb << 8) | lsb;
+}
+
+/*
+ * Write 16-bit value to LSB and MSB registers
+ * Locking: must be called with data->update_lock held
+ */
+static int emc6w201_write16(struct i2c_client *client, u8 reg, u16 val)
+{
+ int err;
+
+ err = i2c_smbus_write_byte_data(client, reg, val & 0xff);
+ if (likely(!err))
+ err = i2c_smbus_write_byte_data(client, reg + 1, val >> 8);
+ if (unlikely(err < 0))
+ dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
+ 16, "write", reg);
+
+ return err;
+}
+
+/* Read 8-bit value from register */
+static u8 emc6w201_read8(struct i2c_client *client, u8 reg)
+{
+ int val;
+
+ val = i2c_smbus_read_byte_data(client, reg);
+ if (unlikely(val < 0)) {
+ dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
+ 8, "read", reg);
+ return 0x00; /* Arbitrary value */
+ }
+
+ return val;
+}
+
+/* Write 8-bit value to register */
+static int emc6w201_write8(struct i2c_client *client, u8 reg, u8 val)
+{
+ int err;
+
+ err = i2c_smbus_write_byte_data(client, reg, val);
+ if (unlikely(err < 0))
+ dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
+ 8, "write", reg);
+
+ return err;
+}
+
+static struct emc6w201_data *emc6w201_update_device(struct device *dev)
+{
+ struct emc6w201_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ int nr;
+
+ mutex_lock(&data->update_lock);
+
+ if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
+ for (nr = 0; nr < 6; nr++) {
+ data->in[input][nr] =
+ emc6w201_read8(client,
+ EMC6W201_REG_IN(nr));
+ data->in[min][nr] =
+ emc6w201_read8(client,
+ EMC6W201_REG_IN_LOW(nr));
+ data->in[max][nr] =
+ emc6w201_read8(client,
+ EMC6W201_REG_IN_HIGH(nr));
+ }
+
+ for (nr = 0; nr < 6; nr++) {
+ data->temp[input][nr] =
+ emc6w201_read8(client,
+ EMC6W201_REG_TEMP(nr));
+ data->temp[min][nr] =
+ emc6w201_read8(client,
+ EMC6W201_REG_TEMP_LOW(nr));
+ data->temp[max][nr] =
+ emc6w201_read8(client,
+ EMC6W201_REG_TEMP_HIGH(nr));
+ }
+
+ for (nr = 0; nr < 5; nr++) {
+ data->fan[input][nr] =
+ emc6w201_read16(client,
+ EMC6W201_REG_FAN(nr));
+ data->fan[min][nr] =
+ emc6w201_read16(client,
+ EMC6W201_REG_FAN_MIN(nr));
+ }
+
+ data->last_updated = jiffies;
+ data->valid = true;
+ }
+
+ mutex_unlock(&data->update_lock);
+
+ return data;
+}
+
+/*
+ * Sysfs callback functions
+ */
+
+static const s16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 };
+
+static ssize_t in_show(struct device *dev, struct device_attribute *devattr,
+ char *buf)
+{
+ struct emc6w201_data *data = emc6w201_update_device(dev);
+ int sf = to_sensor_dev_attr_2(devattr)->index;
+ int nr = to_sensor_dev_attr_2(devattr)->nr;
+
+ return sprintf(buf, "%u\n",
+ (unsigned)data->in[sf][nr] * nominal_mv[nr] / 0xC0);
+}
+
+static ssize_t in_store(struct device *dev, struct device_attribute *devattr,
+ const char *buf, size_t count)
+{
+ struct emc6w201_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ int sf = to_sensor_dev_attr_2(devattr)->index;
+ int nr = to_sensor_dev_attr_2(devattr)->nr;
+ int err;
+ long val;
+ u8 reg;
+
+ err = kstrtol(buf, 10, &val);
+ if (err < 0)
+ return err;
+
+ val = clamp_val(val, 0, 255 * nominal_mv[nr] / 192);
+ val = DIV_ROUND_CLOSEST(val * 192, nominal_mv[nr]);
+ reg = (sf == min) ? EMC6W201_REG_IN_LOW(nr)
+ : EMC6W201_REG_IN_HIGH(nr);
+
+ mutex_lock(&data->update_lock);
+ data->in[sf][nr] = val;
+ err = emc6w201_write8(client, reg, data->in[sf][nr]);
+ mutex_unlock(&data->update_lock);
+
+ return err < 0 ? err : count;
+}
+
+static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
+ char *buf)
+{
+ struct emc6w201_data *data = emc6w201_update_device(dev);
+ int sf = to_sensor_dev_attr_2(devattr)->index;
+ int nr = to_sensor_dev_attr_2(devattr)->nr;
+
+ return sprintf(buf, "%d\n", (int)data->temp[sf][nr] * 1000);
+}
+
+static ssize_t temp_store(struct device *dev,
+ struct device_attribute *devattr, const char *buf,
+ size_t count)
+{
+ struct emc6w201_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ int sf = to_sensor_dev_attr_2(devattr)->index;
+ int nr = to_sensor_dev_attr_2(devattr)->nr;
+ int err;
+ long val;
+ u8 reg;
+
+ err = kstrtol(buf, 10, &val);
+ if (err < 0)
+ return err;
+
+ val = clamp_val(val, -127000, 127000);
+ val = DIV_ROUND_CLOSEST(val, 1000);
+ reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr)
+ : EMC6W201_REG_TEMP_HIGH(nr);
+
+ mutex_lock(&data->update_lock);
+ data->temp[sf][nr] = val;
+ err = emc6w201_write8(client, reg, data->temp[sf][nr]);
+ mutex_unlock(&data->update_lock);
+
+ return err < 0 ? err : count;
+}
+
+static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
+ char *buf)
+{
+ struct emc6w201_data *data = emc6w201_update_device(dev);
+ int sf = to_sensor_dev_attr_2(devattr)->index;
+ int nr = to_sensor_dev_attr_2(devattr)->nr;
+ unsigned rpm;
+
+ if (data->fan[sf][nr] == 0 || data->fan[sf][nr] == 0xFFFF)
+ rpm = 0;
+ else
+ rpm = 5400000U / data->fan[sf][nr];
+
+ return sprintf(buf, "%u\n", rpm);
+}
+
+static ssize_t fan_store(struct device *dev, struct device_attribute *devattr,
+ const char *buf, size_t count)
+{
+ struct emc6w201_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ int sf = to_sensor_dev_attr_2(devattr)->index;
+ int nr = to_sensor_dev_attr_2(devattr)->nr;
+ int err;
+ unsigned long val;
+
+ err = kstrtoul(buf, 10, &val);
+ if (err < 0)
+ return err;
+
+ if (val == 0) {
+ val = 0xFFFF;
+ } else {
+ val = DIV_ROUND_CLOSEST(5400000U, val);
+ val = clamp_val(val, 0, 0xFFFE);
+ }
+
+ mutex_lock(&data->update_lock);
+ data->fan[sf][nr] = val;
+ err = emc6w201_write16(client, EMC6W201_REG_FAN_MIN(nr),
+ data->fan[sf][nr]);
+ mutex_unlock(&data->update_lock);
+
+ return err < 0 ? err : count;
+}
+
+static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, 0, input);
+static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, 0, min);
+static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, 0, max);
+static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, input);
+static SENSOR_DEVICE_ATTR_2_RW(in1_min, in, 1, min);
+static SENSOR_DEVICE_ATTR_2_RW(in1_max, in, 1, max);
+static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, 2, input);
+static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, 2, min);
+static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, 2, max);
+static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, 3, input);
+static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, 3, min);
+static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, 3, max);
+static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, 4, input);
+static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, 4, min);
+static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, 4, max);
+static SENSOR_DEVICE_ATTR_2_RO(in5_input, in, 5, input);
+static SENSOR_DEVICE_ATTR_2_RW(in5_min, in, 5, min);
+static SENSOR_DEVICE_ATTR_2_RW(in5_max, in, 5, max);
+
+static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, input);
+static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 0, min);
+static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, max);
+static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 1, input);
+static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 1, min);
+static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, max);
+static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 2, input);
+static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 2, min);
+static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, max);
+static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 3, input);
+static SENSOR_DEVICE_ATTR_2_RW(temp4_min, temp, 3, min);
+static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, max);
+static SENSOR_DEVICE_ATTR_2_RO(temp5_input, temp, 4, input);
+static SENSOR_DEVICE_ATTR_2_RW(temp5_min, temp, 4, min);
+static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, max);
+static SENSOR_DEVICE_ATTR_2_RO(temp6_input, temp, 5, input);
+static SENSOR_DEVICE_ATTR_2_RW(temp6_min, temp, 5, min);
+static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, max);
+
+static SENSOR_DEVICE_ATTR_2_RO(fan1_input, fan, 0, input);
+static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan, 0, min);
+static SENSOR_DEVICE_ATTR_2_RO(fan2_input, fan, 1, input);
+static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan, 1, min);
+static SENSOR_DEVICE_ATTR_2_RO(fan3_input, fan, 2, input);
+static SENSOR_DEVICE_ATTR_2_RW(fan3_min, fan, 2, min);
+static SENSOR_DEVICE_ATTR_2_RO(fan4_input, fan, 3, input);
+static SENSOR_DEVICE_ATTR_2_RW(fan4_min, fan, 3, min);
+static SENSOR_DEVICE_ATTR_2_RO(fan5_input, fan, 4, input);
+static SENSOR_DEVICE_ATTR_2_RW(fan5_min, fan, 4, min);
+
+static struct attribute *emc6w201_attrs[] = {
+ &sensor_dev_attr_in0_input.dev_attr.attr,
+ &sensor_dev_attr_in0_min.dev_attr.attr,
+ &sensor_dev_attr_in0_max.dev_attr.attr,
+ &sensor_dev_attr_in1_input.dev_attr.attr,
+ &sensor_dev_attr_in1_min.dev_attr.attr,
+ &sensor_dev_attr_in1_max.dev_attr.attr,
+ &sensor_dev_attr_in2_input.dev_attr.attr,
+ &sensor_dev_attr_in2_min.dev_attr.attr,
+ &sensor_dev_attr_in2_max.dev_attr.attr,
+ &sensor_dev_attr_in3_input.dev_attr.attr,
+ &sensor_dev_attr_in3_min.dev_attr.attr,
+ &sensor_dev_attr_in3_max.dev_attr.attr,
+ &sensor_dev_attr_in4_input.dev_attr.attr,
+ &sensor_dev_attr_in4_min.dev_attr.attr,
+ &sensor_dev_attr_in4_max.dev_attr.attr,
+ &sensor_dev_attr_in5_input.dev_attr.attr,
+ &sensor_dev_attr_in5_min.dev_attr.attr,
+ &sensor_dev_attr_in5_max.dev_attr.attr,
+
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp1_min.dev_attr.attr,
+ &sensor_dev_attr_temp1_max.dev_attr.attr,
+ &sensor_dev_attr_temp2_input.dev_attr.attr,
+ &sensor_dev_attr_temp2_min.dev_attr.attr,
+ &sensor_dev_attr_temp2_max.dev_attr.attr,
+ &sensor_dev_attr_temp3_input.dev_attr.attr,
+ &sensor_dev_attr_temp3_min.dev_attr.attr,
+ &sensor_dev_attr_temp3_max.dev_attr.attr,
+ &sensor_dev_attr_temp4_input.dev_attr.attr,
+ &sensor_dev_attr_temp4_min.dev_attr.attr,
+ &sensor_dev_attr_temp4_max.dev_attr.attr,
+ &sensor_dev_attr_temp5_input.dev_attr.attr,
+ &sensor_dev_attr_temp5_min.dev_attr.attr,
+ &sensor_dev_attr_temp5_max.dev_attr.attr,
+ &sensor_dev_attr_temp6_input.dev_attr.attr,
+ &sensor_dev_attr_temp6_min.dev_attr.attr,
+ &sensor_dev_attr_temp6_max.dev_attr.attr,
+
+ &sensor_dev_attr_fan1_input.dev_attr.attr,
+ &sensor_dev_attr_fan1_min.dev_attr.attr,
+ &sensor_dev_attr_fan2_input.dev_attr.attr,
+ &sensor_dev_attr_fan2_min.dev_attr.attr,
+ &sensor_dev_attr_fan3_input.dev_attr.attr,
+ &sensor_dev_attr_fan3_min.dev_attr.attr,
+ &sensor_dev_attr_fan4_input.dev_attr.attr,
+ &sensor_dev_attr_fan4_min.dev_attr.attr,
+ &sensor_dev_attr_fan5_input.dev_attr.attr,
+ &sensor_dev_attr_fan5_min.dev_attr.attr,
+ NULL
+};
+
+ATTRIBUTE_GROUPS(emc6w201);
+
+/*
+ * Driver interface
+ */
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int emc6w201_detect(struct i2c_client *client,
+ struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ int company, verstep, config;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ /* Identification */
+ company = i2c_smbus_read_byte_data(client, EMC6W201_REG_COMPANY);
+ if (company != 0x5C)
+ return -ENODEV;
+ verstep = i2c_smbus_read_byte_data(client, EMC6W201_REG_VERSTEP);
+ if (verstep < 0 || (verstep & 0xF0) != 0xB0)
+ return -ENODEV;
+ if ((verstep & 0x0F) > 2) {
+ dev_dbg(&client->dev, "Unknown EMC6W201 stepping %d\n",
+ verstep & 0x0F);
+ return -ENODEV;
+ }
+
+ /* Check configuration */
+ config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG);
+ if (config < 0 || (config & 0xF4) != 0x04)
+ return -ENODEV;
+ if (!(config & 0x01)) {
+ dev_err(&client->dev, "Monitoring not enabled\n");
+ return -ENODEV;
+ }
+
+ strscpy(info->type, "emc6w201", I2C_NAME_SIZE);
+
+ return 0;
+}
+
+static int emc6w201_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct emc6w201_data *data;
+ struct device *hwmon_dev;
+
+ data = devm_kzalloc(dev, sizeof(struct emc6w201_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->client = client;
+ mutex_init(&data->update_lock);
+
+ hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
+ data,
+ emc6w201_groups);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct i2c_device_id emc6w201_id[] = {
+ { "emc6w201", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, emc6w201_id);
+
+static struct i2c_driver emc6w201_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "emc6w201",
+ },
+ .probe_new = emc6w201_probe,
+ .id_table = emc6w201_id,
+ .detect = emc6w201_detect,
+ .address_list = normal_i2c,
+};
+
+module_i2c_driver(emc6w201_driver);
+
+MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
+MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 11:11:46 +0000