diff options
Diffstat (limited to 'drivers/hwmon/emc6w201.c')
| -rw-r--r-- | drivers/hwmon/emc6w201.c | 487 |
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"); |