diff options
Diffstat (limited to 'drivers/hwmon/emc6w201.c')
| -rw-r--r-- | drivers/hwmon/emc6w201.c | 539 |
1 files changed, 539 insertions, 0 deletions
diff --git a/drivers/hwmon/emc6w201.c b/drivers/hwmon/emc6w201.c new file mode 100644 index 000000000000..e0ef32378ac6 --- /dev/null +++ b/drivers/hwmon/emc6w201.c @@ -0,0 +1,539 @@ +/* + * emc6w201.c - Hardware monitoring driver for the SMSC EMC6W201 + * Copyright (C) 2011 Jean Delvare <khali@linux-fr.org> + * + * 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/module.h> +#include <linux/delay.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 { input, min, max } subfeature; + +/* + * Per-device data + */ + +struct emc6w201_data { + struct device *hwmon_dev; + struct mutex update_lock; + char valid; /* zero 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 (lsb < 0 || msb < 0) { + dev_err(&client->dev, "16-bit read failed at 0x%02x\n", 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 (!err) + err = i2c_smbus_write_byte_data(client, reg + 1, val >> 8); + if (err < 0) + dev_err(&client->dev, "16-bit write failed at 0x%02x\n", reg); + + return err; +} + +static struct emc6w201_data *emc6w201_update_device(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct emc6w201_data *data = i2c_get_clientdata(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] = + i2c_smbus_read_byte_data(client, + EMC6W201_REG_IN(nr)); + data->in[min][nr] = + i2c_smbus_read_byte_data(client, + EMC6W201_REG_IN_LOW(nr)); + data->in[max][nr] = + i2c_smbus_read_byte_data(client, + EMC6W201_REG_IN_HIGH(nr)); + } + + for (nr = 0; nr < 6; nr++) { + data->temp[input][nr] = + i2c_smbus_read_byte_data(client, + EMC6W201_REG_TEMP(nr)); + data->temp[min][nr] = + i2c_smbus_read_byte_data(client, + EMC6W201_REG_TEMP_LOW(nr)); + data->temp[max][nr] = + i2c_smbus_read_byte_data(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 = 1; + } + + mutex_unlock(&data->update_lock); + + return data; +} + +/* + * Sysfs callback functions + */ + +static const u16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 }; + +static ssize_t show_in(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 set_in(struct device *dev, struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct emc6w201_data *data = i2c_get_clientdata(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 = strict_strtol(buf, 10, &val); + if (err < 0) + return err; + + val = DIV_ROUND_CLOSEST(val * 0xC0, 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] = SENSORS_LIMIT(val, 0, 255); + err = i2c_smbus_write_byte_data(client, reg, data->in[sf][nr]); + mutex_unlock(&data->update_lock); + + return err < 0 ? err : count; +} + +static ssize_t show_temp(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 set_temp(struct device *dev, struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct emc6w201_data *data = i2c_get_clientdata(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 = strict_strtol(buf, 10, &val); + if (err < 0) + return err; + + val /= 1000; + reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr) + : EMC6W201_REG_TEMP_HIGH(nr); + + mutex_lock(&data->update_lock); + data->temp[sf][nr] = SENSORS_LIMIT(val, -127, 128); + err = i2c_smbus_write_byte_data(client, reg, data->temp[sf][nr]); + mutex_unlock(&data->update_lock); + + return err < 0 ? err : count; +} + +static ssize_t show_fan(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 set_fan(struct device *dev, struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct emc6w201_data *data = i2c_get_clientdata(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 = strict_strtoul(buf, 10, &val); + if (err < 0) + return err; + + if (val == 0) { + val = 0xFFFF; + } else { + val = DIV_ROUND_CLOSEST(5400000U, val); + val = SENSORS_LIMIT(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(in0_input, S_IRUGO, show_in, NULL, 0, input); +static SENSOR_DEVICE_ATTR_2(in0_min, S_IRUGO | S_IWUSR, show_in, set_in, + 0, min); +static SENSOR_DEVICE_ATTR_2(in0_max, S_IRUGO | S_IWUSR, show_in, set_in, + 0, max); +static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in, NULL, 1, input); +static SENSOR_DEVICE_ATTR_2(in1_min, S_IRUGO | S_IWUSR, show_in, set_in, + 1, min); +static SENSOR_DEVICE_ATTR_2(in1_max, S_IRUGO | S_IWUSR, show_in, set_in, + 1, max); +static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in, NULL, 2, input); +static SENSOR_DEVICE_ATTR_2(in2_min, S_IRUGO | S_IWUSR, show_in, set_in, + 2, min); +static SENSOR_DEVICE_ATTR_2(in2_max, S_IRUGO | S_IWUSR, show_in, set_in, + 2, max); +static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO, show_in, NULL, 3, input); +static SENSOR_DEVICE_ATTR_2(in3_min, S_IRUGO | S_IWUSR, show_in, set_in, + 3, min); +static SENSOR_DEVICE_ATTR_2(in3_max, S_IRUGO | S_IWUSR, show_in, set_in, + 3, max); +static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO, show_in, NULL, 4, input); +static SENSOR_DEVICE_ATTR_2(in4_min, S_IRUGO | S_IWUSR, show_in, set_in, + 4, min); +static SENSOR_DEVICE_ATTR_2(in4_max, S_IRUGO | S_IWUSR, show_in, set_in, + 4, max); +static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO, show_in, NULL, 5, input); +static SENSOR_DEVICE_ATTR_2(in5_min, S_IRUGO | S_IWUSR, show_in, set_in, + 5, min); +static SENSOR_DEVICE_ATTR_2(in5_max, S_IRUGO | S_IWUSR, show_in, set_in, + 5, max); + +static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, input); +static SENSOR_DEVICE_ATTR_2(temp1_min, S_IRUGO | S_IWUSR, show_temp, set_temp, + 0, min); +static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp, + 0, max); +static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, input); +static SENSOR_DEVICE_ATTR_2(temp2_min, S_IRUGO | S_IWUSR, show_temp, set_temp, + 1, min); +static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp, + 1, max); +static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 2, input); +static SENSOR_DEVICE_ATTR_2(temp3_min, S_IRUGO | S_IWUSR, show_temp, set_temp, + 2, min); +static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp, + 2, max); +static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 3, input); +static SENSOR_DEVICE_ATTR_2(temp4_min, S_IRUGO | S_IWUSR, show_temp, set_temp, + 3, min); +static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, set_temp, + 3, max); +static SENSOR_DEVICE_ATTR_2(temp5_input, S_IRUGO, show_temp, NULL, 4, input); +static SENSOR_DEVICE_ATTR_2(temp5_min, S_IRUGO | S_IWUSR, show_temp, set_temp, + 4, min); +static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, set_temp, + 4, max); +static SENSOR_DEVICE_ATTR_2(temp6_input, S_IRUGO, show_temp, NULL, 5, input); +static SENSOR_DEVICE_ATTR_2(temp6_min, S_IRUGO | S_IWUSR, show_temp, set_temp, + 5, min); +static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO | S_IWUSR, show_temp, set_temp, + 5, max); + +static SENSOR_DEVICE_ATTR_2(fan1_input, S_IRUGO, show_fan, NULL, 0, input); +static SENSOR_DEVICE_ATTR_2(fan1_min, S_IRUGO | S_IWUSR, show_fan, set_fan, + 0, min); +static SENSOR_DEVICE_ATTR_2(fan2_input, S_IRUGO, show_fan, NULL, 1, input); +static SENSOR_DEVICE_ATTR_2(fan2_min, S_IRUGO | S_IWUSR, show_fan, set_fan, + 1, min); +static SENSOR_DEVICE_ATTR_2(fan3_input, S_IRUGO, show_fan, NULL, 2, input); +static SENSOR_DEVICE_ATTR_2(fan3_min, S_IRUGO | S_IWUSR, show_fan, set_fan, + 2, min); +static SENSOR_DEVICE_ATTR_2(fan4_input, S_IRUGO, show_fan, NULL, 3, input); +static SENSOR_DEVICE_ATTR_2(fan4_min, S_IRUGO | S_IWUSR, show_fan, set_fan, + 3, min); +static SENSOR_DEVICE_ATTR_2(fan5_input, S_IRUGO, show_fan, NULL, 4, input); +static SENSOR_DEVICE_ATTR_2(fan5_min, S_IRUGO | S_IWUSR, show_fan, set_fan, + 4, min); + +static struct attribute *emc6w201_attributes[] = { + &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 +}; + +static const struct attribute_group emc6w201_group = { + .attrs = emc6w201_attributes, +}; + +/* + * 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, "Unknwown EMC6W201 stepping %d\n", + verstep & 0x0F); + return -ENODEV; + } + + /* Check configuration */ + config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG); + if ((config & 0xF4) != 0x04) + return -ENODEV; + if (!(config & 0x01)) { + dev_err(&client->dev, "Monitoring not enabled\n"); + return -ENODEV; + } + + strlcpy(info->type, "emc6w201", I2C_NAME_SIZE); + + return 0; +} + +static int emc6w201_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct emc6w201_data *data; + int err; + + data = kzalloc(sizeof(struct emc6w201_data), GFP_KERNEL); + if (!data) { + err = -ENOMEM; + goto exit; + } + + i2c_set_clientdata(client, data); + mutex_init(&data->update_lock); + + /* Create sysfs attribute */ + err = sysfs_create_group(&client->dev.kobj, &emc6w201_group); + if (err) + goto exit_free; + + /* Expose as a hwmon device */ + data->hwmon_dev = hwmon_device_register(&client->dev); + if (IS_ERR(data->hwmon_dev)) { + err = PTR_ERR(data->hwmon_dev); + goto exit_remove; + } + + return 0; + + exit_remove: + sysfs_remove_group(&client->dev.kobj, &emc6w201_group); + exit_free: + kfree(data); + exit: + return err; +} + +static int emc6w201_remove(struct i2c_client *client) +{ + struct emc6w201_data *data = i2c_get_clientdata(client); + + hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&client->dev.kobj, &emc6w201_group); + kfree(data); + + return 0; +} + +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 = emc6w201_probe, + .remove = emc6w201_remove, + .id_table = emc6w201_id, + .detect = emc6w201_detect, + .address_list = normal_i2c, +}; + +static int __init sensors_emc6w201_init(void) +{ + return i2c_add_driver(&emc6w201_driver); +} +module_init(sensors_emc6w201_init); + +static void __exit sensors_emc6w201_exit(void) +{ + i2c_del_driver(&emc6w201_driver); +} +module_exit(sensors_emc6w201_exit); + +MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); +MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver"); +MODULE_LICENSE("GPL"); |