/* * emc1403.c - SMSC Thermal Driver * * Copyright (C) 2008 Intel Corp * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * 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; version 2 of the License. * * 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., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * TODO * - cache alarm and critical limit registers * - add emc1404 support */ #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> #define THERMAL_PID_REG 0xfd #define THERMAL_SMSC_ID_REG 0xfe #define THERMAL_REVISION_REG 0xff struct thermal_data { struct device *hwmon_dev; struct mutex mutex; /* Cache the hyst value so we don't keep re-reading it. In theory we could cache it forever as nobody else should be writing it. */ u8 cached_hyst; unsigned long hyst_valid; }; static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); int retval = i2c_smbus_read_byte_data(client, sda->index); if (retval < 0) return retval; return sprintf(buf, "%d000\n", retval); } static ssize_t show_bit(struct device *dev, struct device_attribute *attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr); int retval = i2c_smbus_read_byte_data(client, sda->nr); if (retval < 0) return retval; retval &= sda->index; return sprintf(buf, "%d\n", retval ? 1 : 0); } static ssize_t store_temp(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); struct i2c_client *client = to_i2c_client(dev); unsigned long val; int retval; if (strict_strtoul(buf, 10, &val)) return -EINVAL; retval = i2c_smbus_write_byte_data(client, sda->index, DIV_ROUND_CLOSEST(val, 1000)); if (retval < 0) return retval; return count; } static ssize_t store_bit(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct i2c_client *client = to_i2c_client(dev); struct thermal_data *data = i2c_get_clientdata(client); struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr); unsigned long val; int retval; if (strict_strtoul(buf, 10, &val)) return -EINVAL; mutex_lock(&data->mutex); retval = i2c_smbus_read_byte_data(client, sda->nr); if (retval < 0) goto fail; retval &= ~sda->index; if (val) retval |= sda->index; retval = i2c_smbus_write_byte_data(client, sda->index, retval); if (retval == 0) retval = count; fail: mutex_unlock(&data->mutex); return retval; } static ssize_t show_hyst(struct device *dev, struct device_attribute *attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct thermal_data *data = i2c_get_clientdata(client); struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); int retval; int hyst; retval = i2c_smbus_read_byte_data(client, sda->index); if (retval < 0) return retval; if (time_after(jiffies, data->hyst_valid)) { hyst = i2c_smbus_read_byte_data(client, 0x21); if (hyst < 0) return retval; data->cached_hyst = hyst; data->hyst_valid = jiffies + HZ; } return sprintf(buf, "%d000\n", retval - data->cached_hyst); } static ssize_t store_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct i2c_client *client = to_i2c_client(dev); struct thermal_data *data = i2c_get_clientdata(client); struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); int retval; int hyst; unsigned long val; if (strict_strtoul(buf, 10, &val)) return -EINVAL; mutex_lock(&data->mutex); retval = i2c_smbus_read_byte_data(client, sda->index); if (retval < 0) goto fail; hyst = val - retval * 1000; hyst = DIV_ROUND_CLOSEST(hyst, 1000); if (hyst < 0 || hyst > 255) { retval = -ERANGE; goto fail; } retval = i2c_smbus_write_byte_data(client, 0x21, hyst); if (retval == 0) { retval = count; data->cached_hyst = hyst; data->hyst_valid = jiffies + HZ; } fail: mutex_unlock(&data->mutex); return retval; } /* * Sensors. We pass the actual i2c register to the methods. */ static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x06); static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x05); static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x20); static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0x00); static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_bit, NULL, 0x36, 0x01); static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_bit, NULL, 0x35, 0x01); static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_bit, NULL, 0x37, 0x01); static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO | S_IWUSR, show_hyst, store_hyst, 0x20); static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x08); static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x07); static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x19); static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 0x01); static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_bit, NULL, 0x36, 0x02); static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_bit, NULL, 0x35, 0x02); static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_bit, NULL, 0x37, 0x02); static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO | S_IWUSR, show_hyst, store_hyst, 0x19); static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x16); static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x15); static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO | S_IWUSR, show_temp, store_temp, 0x1A); static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 0x23); static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_bit, NULL, 0x36, 0x04); static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_bit, NULL, 0x35, 0x04); static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_bit, NULL, 0x37, 0x04); static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO | S_IWUSR, show_hyst, store_hyst, 0x1A); static SENSOR_DEVICE_ATTR_2(power_state, S_IRUGO | S_IWUSR, show_bit, store_bit, 0x03, 0x40); static struct attribute *mid_att_thermal[] = { &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_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_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_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_temp2_crit_hyst.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_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_crit_hyst.dev_attr.attr, &sensor_dev_attr_power_state.dev_attr.attr, NULL }; static const struct attribute_group m_thermal_gr = { .attrs = mid_att_thermal }; 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 0x21: strlcpy(info->type, "emc1403", I2C_NAME_SIZE); break; case 0x23: strlcpy(info->type, "emc1423", I2C_NAME_SIZE); break; /* Note: 0x25 is the 1404 which is very similar and this driver could be extended */ default: return -ENODEV; } id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG); if (id != 0x01) return -ENODEV; return 0; } static int emc1403_probe(struct i2c_client *client, const struct i2c_device_id *id) { int res; struct thermal_data *data; data = kzalloc(sizeof(struct thermal_data), GFP_KERNEL); if (data == NULL) { dev_warn(&client->dev, "out of memory"); return -ENOMEM; } i2c_set_clientdata(client, data); mutex_init(&data->mutex); data->hyst_valid = jiffies - 1; /* Expired */ res = sysfs_create_group(&client->dev.kobj, &m_thermal_gr); if (res) { dev_warn(&client->dev, "create group failed\n"); goto thermal_error1; } data->hwmon_dev = hwmon_device_register(&client->dev); if (IS_ERR(data->hwmon_dev)) { res = PTR_ERR(data->hwmon_dev); dev_warn(&client->dev, "register hwmon dev failed\n"); goto thermal_error2; } dev_info(&client->dev, "EMC1403 Thermal chip found\n"); return res; thermal_error2: sysfs_remove_group(&client->dev.kobj, &m_thermal_gr); thermal_error1: kfree(data); return res; } static int emc1403_remove(struct i2c_client *client) { struct thermal_data *data = i2c_get_clientdata(client); hwmon_device_unregister(data->hwmon_dev); sysfs_remove_group(&client->dev.kobj, &m_thermal_gr); kfree(data); return 0; } static const unsigned short emc1403_address_list[] = { 0x18, 0x29, 0x4c, 0x4d, I2C_CLIENT_END }; static const struct i2c_device_id emc1403_idtable[] = { { "emc1403", 0 }, { "emc1423", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, emc1403_idtable); static struct i2c_driver sensor_emc1403 = { .class = I2C_CLASS_HWMON, .driver = { .name = "emc1403", }, .detect = emc1403_detect, .probe = emc1403_probe, .remove = emc1403_remove, .id_table = emc1403_idtable, .address_list = emc1403_address_list, }; static int __init sensor_emc1403_init(void) { return i2c_add_driver(&sensor_emc1403); } static void __exit sensor_emc1403_exit(void) { i2c_del_driver(&sensor_emc1403); } module_init(sensor_emc1403_init); module_exit(sensor_emc1403_exit); MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com"); MODULE_DESCRIPTION("emc1403 Thermal Driver"); MODULE_LICENSE("GPL v2");