/* * 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");