diff options
Diffstat (limited to 'drivers/hwmon/lm80.c')
| -rw-r--r-- | drivers/hwmon/lm80.c | 737 |
1 files changed, 737 insertions, 0 deletions
diff --git a/drivers/hwmon/lm80.c b/drivers/hwmon/lm80.c new file mode 100644 index 00000000..e2c43e17 --- /dev/null +++ b/drivers/hwmon/lm80.c @@ -0,0 +1,737 @@ +/* + * lm80.c - From lm_sensors, Linux kernel modules for hardware + * monitoring + * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl> + * and Philip Edelbrock <phil@netroedge.com> + * + * Ported to Linux 2.6 by Tiago Sousa <mirage@kaotik.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/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[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, + 0x2e, 0x2f, I2C_CLIENT_END }; + +/* Many LM80 constants specified below */ + +/* The LM80 registers */ +#define LM80_REG_IN_MAX(nr) (0x2a + (nr) * 2) +#define LM80_REG_IN_MIN(nr) (0x2b + (nr) * 2) +#define LM80_REG_IN(nr) (0x20 + (nr)) + +#define LM80_REG_FAN1 0x28 +#define LM80_REG_FAN2 0x29 +#define LM80_REG_FAN_MIN(nr) (0x3b + (nr)) + +#define LM80_REG_TEMP 0x27 +#define LM80_REG_TEMP_HOT_MAX 0x38 +#define LM80_REG_TEMP_HOT_HYST 0x39 +#define LM80_REG_TEMP_OS_MAX 0x3a +#define LM80_REG_TEMP_OS_HYST 0x3b + +#define LM80_REG_CONFIG 0x00 +#define LM80_REG_ALARM1 0x01 +#define LM80_REG_ALARM2 0x02 +#define LM80_REG_MASK1 0x03 +#define LM80_REG_MASK2 0x04 +#define LM80_REG_FANDIV 0x05 +#define LM80_REG_RES 0x06 + +#define LM96080_REG_CONV_RATE 0x07 +#define LM96080_REG_MAN_ID 0x3e +#define LM96080_REG_DEV_ID 0x3f + + +/* + * Conversions. Rounding and limit checking is only done on the TO_REG + * variants. Note that you should be a bit careful with which arguments + * these macros are called: arguments may be evaluated more than once. + * Fixing this is just not worth it. + */ + +#define IN_TO_REG(val) (SENSORS_LIMIT(((val) + 5) / 10, 0, 255)) +#define IN_FROM_REG(val) ((val) * 10) + +static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div) +{ + if (rpm == 0) + return 255; + rpm = SENSORS_LIMIT(rpm, 1, 1000000); + return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254); +} + +#define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : \ + (val) == 255 ? 0 : 1350000/((div) * (val))) + +static inline long TEMP_FROM_REG(u16 temp) +{ + long res; + + temp >>= 4; + if (temp < 0x0800) + res = 625 * (long) temp; + else + res = ((long) temp - 0x01000) * 625; + + return res / 10; +} + +#define TEMP_LIMIT_FROM_REG(val) (((val) > 0x80 ? \ + (val) - 0x100 : (val)) * 1000) + +#define TEMP_LIMIT_TO_REG(val) SENSORS_LIMIT((val) < 0 ? \ + ((val) - 500) / 1000 : ((val) + 500) / 1000, 0, 255) + +#define DIV_FROM_REG(val) (1 << (val)) + +/* + * Client data (each client gets its own) + */ + +struct lm80_data { + struct device *hwmon_dev; + struct mutex update_lock; + char error; /* !=0 if error occurred during last update */ + char valid; /* !=0 if following fields are valid */ + unsigned long last_updated; /* In jiffies */ + + u8 in[7]; /* Register value */ + u8 in_max[7]; /* Register value */ + u8 in_min[7]; /* Register value */ + u8 fan[2]; /* Register value */ + u8 fan_min[2]; /* Register value */ + u8 fan_div[2]; /* Register encoding, shifted right */ + u16 temp; /* Register values, shifted right */ + u8 temp_hot_max; /* Register value */ + u8 temp_hot_hyst; /* Register value */ + u8 temp_os_max; /* Register value */ + u8 temp_os_hyst; /* Register value */ + u16 alarms; /* Register encoding, combined */ +}; + +/* + * Functions declaration + */ + +static int lm80_probe(struct i2c_client *client, + const struct i2c_device_id *id); +static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info); +static void lm80_init_client(struct i2c_client *client); +static int lm80_remove(struct i2c_client *client); +static struct lm80_data *lm80_update_device(struct device *dev); +static int lm80_read_value(struct i2c_client *client, u8 reg); +static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value); + +/* + * Driver data (common to all clients) + */ + +static const struct i2c_device_id lm80_id[] = { + { "lm80", 0 }, + { "lm96080", 1 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, lm80_id); + +static struct i2c_driver lm80_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "lm80", + }, + .probe = lm80_probe, + .remove = lm80_remove, + .id_table = lm80_id, + .detect = lm80_detect, + .address_list = normal_i2c, +}; + +/* + * Sysfs stuff + */ + +#define show_in(suffix, value) \ +static ssize_t show_in_##suffix(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + int nr = to_sensor_dev_attr(attr)->index; \ + struct lm80_data *data = lm80_update_device(dev); \ + if (IS_ERR(data)) \ + return PTR_ERR(data); \ + return sprintf(buf, "%d\n", IN_FROM_REG(data->value[nr])); \ +} +show_in(min, in_min) +show_in(max, in_max) +show_in(input, in) + +#define set_in(suffix, value, reg) \ +static ssize_t set_in_##suffix(struct device *dev, \ + struct device_attribute *attr, const char *buf, size_t count) \ +{ \ + int nr = to_sensor_dev_attr(attr)->index; \ + struct i2c_client *client = to_i2c_client(dev); \ + struct lm80_data *data = i2c_get_clientdata(client); \ + long val; \ + int err = kstrtol(buf, 10, &val); \ + if (err < 0) \ + return err; \ +\ + mutex_lock(&data->update_lock);\ + data->value[nr] = IN_TO_REG(val); \ + lm80_write_value(client, reg(nr), data->value[nr]); \ + mutex_unlock(&data->update_lock);\ + return count; \ +} +set_in(min, in_min, LM80_REG_IN_MIN) +set_in(max, in_max, LM80_REG_IN_MAX) + +#define show_fan(suffix, value) \ +static ssize_t show_fan_##suffix(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + int nr = to_sensor_dev_attr(attr)->index; \ + struct lm80_data *data = lm80_update_device(dev); \ + if (IS_ERR(data)) \ + return PTR_ERR(data); \ + return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[nr], \ + DIV_FROM_REG(data->fan_div[nr]))); \ +} +show_fan(min, fan_min) +show_fan(input, fan) + +static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr, + char *buf) +{ + int nr = to_sensor_dev_attr(attr)->index; + struct lm80_data *data = lm80_update_device(dev); + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr])); +} + +static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int nr = to_sensor_dev_attr(attr)->index; + struct i2c_client *client = to_i2c_client(dev); + struct lm80_data *data = i2c_get_clientdata(client); + unsigned long val; + int err = kstrtoul(buf, 10, &val); + if (err < 0) + return err; + + mutex_lock(&data->update_lock); + data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr])); + lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]); + mutex_unlock(&data->update_lock); + return count; +} + +/* + * Note: we save and restore the fan minimum here, because its value is + * determined in part by the fan divisor. This follows the principle of + * least surprise; the user doesn't expect the fan minimum to change just + * because the divisor changed. + */ +static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int nr = to_sensor_dev_attr(attr)->index; + struct i2c_client *client = to_i2c_client(dev); + struct lm80_data *data = i2c_get_clientdata(client); + unsigned long min, val; + u8 reg; + int err = kstrtoul(buf, 10, &val); + if (err < 0) + return err; + + /* Save fan_min */ + mutex_lock(&data->update_lock); + min = FAN_FROM_REG(data->fan_min[nr], + DIV_FROM_REG(data->fan_div[nr])); + + switch (val) { + case 1: + data->fan_div[nr] = 0; + break; + case 2: + data->fan_div[nr] = 1; + break; + case 4: + data->fan_div[nr] = 2; + break; + case 8: + data->fan_div[nr] = 3; + break; + default: + dev_err(&client->dev, "fan_div value %ld not " + "supported. Choose one of 1, 2, 4 or 8!\n", val); + mutex_unlock(&data->update_lock); + return -EINVAL; + } + + reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1)))) + | (data->fan_div[nr] << (2 * (nr + 1))); + lm80_write_value(client, LM80_REG_FANDIV, reg); + + /* Restore fan_min */ + data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr])); + lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]); + mutex_unlock(&data->update_lock); + + return count; +} + +static ssize_t show_temp_input1(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct lm80_data *data = lm80_update_device(dev); + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp)); +} + +#define show_temp(suffix, value) \ +static ssize_t show_temp_##suffix(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + struct lm80_data *data = lm80_update_device(dev); \ + if (IS_ERR(data)) \ + return PTR_ERR(data); \ + return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \ +} +show_temp(hot_max, temp_hot_max); +show_temp(hot_hyst, temp_hot_hyst); +show_temp(os_max, temp_os_max); +show_temp(os_hyst, temp_os_hyst); + +#define set_temp(suffix, value, reg) \ +static ssize_t set_temp_##suffix(struct device *dev, \ + struct device_attribute *attr, const char *buf, size_t count) \ +{ \ + struct i2c_client *client = to_i2c_client(dev); \ + struct lm80_data *data = i2c_get_clientdata(client); \ + long val; \ + int err = kstrtol(buf, 10, &val); \ + if (err < 0) \ + return err; \ +\ + mutex_lock(&data->update_lock); \ + data->value = TEMP_LIMIT_TO_REG(val); \ + lm80_write_value(client, reg, data->value); \ + mutex_unlock(&data->update_lock); \ + return count; \ +} +set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX); +set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST); +set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX); +set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST); + +static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct lm80_data *data = lm80_update_device(dev); + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%u\n", data->alarms); +} + +static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, + char *buf) +{ + int bitnr = to_sensor_dev_attr(attr)->index; + struct lm80_data *data = lm80_update_device(dev); + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); +} + +static SENSOR_DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO, + show_in_min, set_in_min, 0); +static SENSOR_DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO, + show_in_min, set_in_min, 1); +static SENSOR_DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO, + show_in_min, set_in_min, 2); +static SENSOR_DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO, + show_in_min, set_in_min, 3); +static SENSOR_DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO, + show_in_min, set_in_min, 4); +static SENSOR_DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO, + show_in_min, set_in_min, 5); +static SENSOR_DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO, + show_in_min, set_in_min, 6); +static SENSOR_DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO, + show_in_max, set_in_max, 0); +static SENSOR_DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO, + show_in_max, set_in_max, 1); +static SENSOR_DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO, + show_in_max, set_in_max, 2); +static SENSOR_DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO, + show_in_max, set_in_max, 3); +static SENSOR_DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO, + show_in_max, set_in_max, 4); +static SENSOR_DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO, + show_in_max, set_in_max, 5); +static SENSOR_DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO, + show_in_max, set_in_max, 6); +static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in_input, NULL, 0); +static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in_input, NULL, 1); +static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in_input, NULL, 2); +static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in_input, NULL, 3); +static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in_input, NULL, 4); +static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_in_input, NULL, 5); +static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_in_input, NULL, 6); +static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, + show_fan_min, set_fan_min, 0); +static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO, + show_fan_min, set_fan_min, 1); +static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0); +static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1); +static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, + show_fan_div, set_fan_div, 0); +static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO, + show_fan_div, set_fan_div, 1); +static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL); +static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max, + set_temp_hot_max); +static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst, + set_temp_hot_hyst); +static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max, + set_temp_os_max); +static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst, + set_temp_os_hyst); +static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); +static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0); +static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1); +static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2); +static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3); +static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 4); +static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 5); +static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6); +static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 10); +static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 11); +static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 8); +static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13); + +/* + * Real code + */ + +static struct attribute *lm80_attributes[] = { + &sensor_dev_attr_in0_min.dev_attr.attr, + &sensor_dev_attr_in1_min.dev_attr.attr, + &sensor_dev_attr_in2_min.dev_attr.attr, + &sensor_dev_attr_in3_min.dev_attr.attr, + &sensor_dev_attr_in4_min.dev_attr.attr, + &sensor_dev_attr_in5_min.dev_attr.attr, + &sensor_dev_attr_in6_min.dev_attr.attr, + &sensor_dev_attr_in0_max.dev_attr.attr, + &sensor_dev_attr_in1_max.dev_attr.attr, + &sensor_dev_attr_in2_max.dev_attr.attr, + &sensor_dev_attr_in3_max.dev_attr.attr, + &sensor_dev_attr_in4_max.dev_attr.attr, + &sensor_dev_attr_in5_max.dev_attr.attr, + &sensor_dev_attr_in6_max.dev_attr.attr, + &sensor_dev_attr_in0_input.dev_attr.attr, + &sensor_dev_attr_in1_input.dev_attr.attr, + &sensor_dev_attr_in2_input.dev_attr.attr, + &sensor_dev_attr_in3_input.dev_attr.attr, + &sensor_dev_attr_in4_input.dev_attr.attr, + &sensor_dev_attr_in5_input.dev_attr.attr, + &sensor_dev_attr_in6_input.dev_attr.attr, + &sensor_dev_attr_fan1_min.dev_attr.attr, + &sensor_dev_attr_fan2_min.dev_attr.attr, + &sensor_dev_attr_fan1_input.dev_attr.attr, + &sensor_dev_attr_fan2_input.dev_attr.attr, + &sensor_dev_attr_fan1_div.dev_attr.attr, + &sensor_dev_attr_fan2_div.dev_attr.attr, + &dev_attr_temp1_input.attr, + &dev_attr_temp1_max.attr, + &dev_attr_temp1_max_hyst.attr, + &dev_attr_temp1_crit.attr, + &dev_attr_temp1_crit_hyst.attr, + &dev_attr_alarms.attr, + &sensor_dev_attr_in0_alarm.dev_attr.attr, + &sensor_dev_attr_in1_alarm.dev_attr.attr, + &sensor_dev_attr_in2_alarm.dev_attr.attr, + &sensor_dev_attr_in3_alarm.dev_attr.attr, + &sensor_dev_attr_in4_alarm.dev_attr.attr, + &sensor_dev_attr_in5_alarm.dev_attr.attr, + &sensor_dev_attr_in6_alarm.dev_attr.attr, + &sensor_dev_attr_fan1_alarm.dev_attr.attr, + &sensor_dev_attr_fan2_alarm.dev_attr.attr, + &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, + &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, + NULL +}; + +static const struct attribute_group lm80_group = { + .attrs = lm80_attributes, +}; + +/* Return 0 if detection is successful, -ENODEV otherwise */ +static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info) +{ + struct i2c_adapter *adapter = client->adapter; + int i, cur, man_id, dev_id; + const char *name = NULL; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + /* First check for unused bits, common to both chip types */ + if ((lm80_read_value(client, LM80_REG_ALARM2) & 0xc0) + || (lm80_read_value(client, LM80_REG_CONFIG) & 0x80)) + return -ENODEV; + + /* + * The LM96080 has manufacturer and stepping/die rev registers so we + * can just check that. The LM80 does not have such registers so we + * have to use a more expensive trick. + */ + man_id = lm80_read_value(client, LM96080_REG_MAN_ID); + dev_id = lm80_read_value(client, LM96080_REG_DEV_ID); + if (man_id == 0x01 && dev_id == 0x08) { + /* Check more unused bits for confirmation */ + if (lm80_read_value(client, LM96080_REG_CONV_RATE) & 0xfe) + return -ENODEV; + + name = "lm96080"; + } else { + /* Check 6-bit addressing */ + for (i = 0x2a; i <= 0x3d; i++) { + cur = i2c_smbus_read_byte_data(client, i); + if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur) + || (i2c_smbus_read_byte_data(client, i + 0x80) != cur) + || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur)) + return -ENODEV; + } + + name = "lm80"; + } + + strlcpy(info->type, name, I2C_NAME_SIZE); + + return 0; +} + +static int lm80_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct lm80_data *data; + int err; + + data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL); + if (!data) { + err = -ENOMEM; + goto exit; + } + + i2c_set_clientdata(client, data); + mutex_init(&data->update_lock); + + /* Initialize the LM80 chip */ + lm80_init_client(client); + + /* A few vars need to be filled upon startup */ + data->fan_min[0] = lm80_read_value(client, LM80_REG_FAN_MIN(1)); + data->fan_min[1] = lm80_read_value(client, LM80_REG_FAN_MIN(2)); + + /* Register sysfs hooks */ + err = sysfs_create_group(&client->dev.kobj, &lm80_group); + if (err) + goto error_free; + + data->hwmon_dev = hwmon_device_register(&client->dev); + if (IS_ERR(data->hwmon_dev)) { + err = PTR_ERR(data->hwmon_dev); + goto error_remove; + } + + return 0; + +error_remove: + sysfs_remove_group(&client->dev.kobj, &lm80_group); +error_free: + kfree(data); +exit: + return err; +} + +static int lm80_remove(struct i2c_client *client) +{ + struct lm80_data *data = i2c_get_clientdata(client); + + hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&client->dev.kobj, &lm80_group); + + kfree(data); + return 0; +} + +static int lm80_read_value(struct i2c_client *client, u8 reg) +{ + return i2c_smbus_read_byte_data(client, reg); +} + +static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value) +{ + return i2c_smbus_write_byte_data(client, reg, value); +} + +/* Called when we have found a new LM80. */ +static void lm80_init_client(struct i2c_client *client) +{ + /* + * Reset all except Watchdog values and last conversion values + * This sets fan-divs to 2, among others. This makes most other + * initializations unnecessary + */ + lm80_write_value(client, LM80_REG_CONFIG, 0x80); + /* Set 11-bit temperature resolution */ + lm80_write_value(client, LM80_REG_RES, 0x08); + + /* Start monitoring */ + lm80_write_value(client, LM80_REG_CONFIG, 0x01); +} + +static struct lm80_data *lm80_update_device(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct lm80_data *data = i2c_get_clientdata(client); + int i; + int rv; + int prev_rv; + struct lm80_data *ret = data; + + mutex_lock(&data->update_lock); + + if (data->error) + lm80_init_client(client); + + if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { + dev_dbg(&client->dev, "Starting lm80 update\n"); + for (i = 0; i <= 6; i++) { + rv = lm80_read_value(client, LM80_REG_IN(i)); + if (rv < 0) + goto abort; + data->in[i] = rv; + + rv = lm80_read_value(client, LM80_REG_IN_MIN(i)); + if (rv < 0) + goto abort; + data->in_min[i] = rv; + + rv = lm80_read_value(client, LM80_REG_IN_MAX(i)); + if (rv < 0) + goto abort; + data->in_max[i] = rv; + } + + rv = lm80_read_value(client, LM80_REG_FAN1); + if (rv < 0) + goto abort; + data->fan[0] = rv; + + rv = lm80_read_value(client, LM80_REG_FAN_MIN(1)); + if (rv < 0) + goto abort; + data->fan_min[0] = rv; + + rv = lm80_read_value(client, LM80_REG_FAN2); + if (rv < 0) + goto abort; + data->fan[1] = rv; + + rv = lm80_read_value(client, LM80_REG_FAN_MIN(2)); + if (rv < 0) + goto abort; + data->fan_min[1] = rv; + + prev_rv = rv = lm80_read_value(client, LM80_REG_TEMP); + if (rv < 0) + goto abort; + rv = lm80_read_value(client, LM80_REG_RES); + if (rv < 0) + goto abort; + data->temp = (prev_rv << 8) | (rv & 0xf0); + + rv = lm80_read_value(client, LM80_REG_TEMP_OS_MAX); + if (rv < 0) + goto abort; + data->temp_os_max = rv; + + rv = lm80_read_value(client, LM80_REG_TEMP_OS_HYST); + if (rv < 0) + goto abort; + data->temp_os_hyst = rv; + + rv = lm80_read_value(client, LM80_REG_TEMP_HOT_MAX); + if (rv < 0) + goto abort; + data->temp_hot_max = rv; + + rv = lm80_read_value(client, LM80_REG_TEMP_HOT_HYST); + if (rv < 0) + goto abort; + data->temp_hot_hyst = rv; + + rv = lm80_read_value(client, LM80_REG_FANDIV); + if (rv < 0) + goto abort; + data->fan_div[0] = (rv >> 2) & 0x03; + data->fan_div[1] = (rv >> 4) & 0x03; + + prev_rv = rv = lm80_read_value(client, LM80_REG_ALARM1); + if (rv < 0) + goto abort; + rv = lm80_read_value(client, LM80_REG_ALARM2); + if (rv < 0) + goto abort; + data->alarms = prev_rv + (rv << 8); + + data->last_updated = jiffies; + data->valid = 1; + data->error = 0; + } + goto done; + +abort: + ret = ERR_PTR(rv); + data->valid = 0; + data->error = 1; + +done: + mutex_unlock(&data->update_lock); + + return ret; +} + +module_i2c_driver(lm80_driver); + +MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " + "Philip Edelbrock <phil@netroedge.com>"); +MODULE_DESCRIPTION("LM80 driver"); +MODULE_LICENSE("GPL"); |