/drivers/hwmon/emc1403.c
C | 344 lines | 269 code | 42 blank | 33 comment | 23 complexity | a174abd480727f36bdbe64094aab3648 MD5 | raw file
- /*
- * 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");