diff options
Diffstat (limited to 'drivers/hwmon/emc1403.c')
| -rw-r--r-- | drivers/hwmon/emc1403.c | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/drivers/hwmon/emc1403.c b/drivers/hwmon/emc1403.c new file mode 100644 index 0000000..0e4b564 --- /dev/null +++ b/drivers/hwmon/emc1403.c @@ -0,0 +1,344 @@ +/* + * 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 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 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, + 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 */ + + id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG); + if (id != 0x5d) + return -ENODEV; + + /* Note: 0x25 is the 1404 which is very similar and this + driver could be extended */ + id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG); + if (id != 0x21) + return -ENODEV; + + id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG); + if (id != 0x01) + return -ENODEV; + + strlcpy(info->type, "emc1403", I2C_NAME_SIZE); + 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"); + hwmon_device_unregister(data->hwmon_dev); + 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, 0x2a, 0x4c, 0x4d, I2C_CLIENT_END +}; + +static const struct i2c_device_id emc1403_idtable[] = { + { "emc1403", 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"); |
