| /* |
| * max1619.c - Part of lm_sensors, Linux kernel modules for hardware |
| * monitoring |
| * Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru> |
| * Jean Delvare <khali@linux-fr.org> |
| * |
| * Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim. |
| * It reports up to two temperatures (its own plus up to |
| * one external one). Complete datasheet can be |
| * obtained from Maxim's website at: |
| * http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf |
| * |
| * 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> |
| #include <linux/sysfs.h> |
| |
| static const unsigned short normal_i2c[] = { |
| 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; |
| |
| /* |
| * Insmod parameters |
| */ |
| |
| I2C_CLIENT_INSMOD_1(max1619); |
| |
| /* |
| * The MAX1619 registers |
| */ |
| |
| #define MAX1619_REG_R_MAN_ID 0xFE |
| #define MAX1619_REG_R_CHIP_ID 0xFF |
| #define MAX1619_REG_R_CONFIG 0x03 |
| #define MAX1619_REG_W_CONFIG 0x09 |
| #define MAX1619_REG_R_CONVRATE 0x04 |
| #define MAX1619_REG_W_CONVRATE 0x0A |
| #define MAX1619_REG_R_STATUS 0x02 |
| #define MAX1619_REG_R_LOCAL_TEMP 0x00 |
| #define MAX1619_REG_R_REMOTE_TEMP 0x01 |
| #define MAX1619_REG_R_REMOTE_HIGH 0x07 |
| #define MAX1619_REG_W_REMOTE_HIGH 0x0D |
| #define MAX1619_REG_R_REMOTE_LOW 0x08 |
| #define MAX1619_REG_W_REMOTE_LOW 0x0E |
| #define MAX1619_REG_R_REMOTE_CRIT 0x10 |
| #define MAX1619_REG_W_REMOTE_CRIT 0x12 |
| #define MAX1619_REG_R_TCRIT_HYST 0x11 |
| #define MAX1619_REG_W_TCRIT_HYST 0x13 |
| |
| /* |
| * Conversions |
| */ |
| |
| static int temp_from_reg(int val) |
| { |
| return (val & 0x80 ? val-0x100 : val) * 1000; |
| } |
| |
| static int temp_to_reg(int val) |
| { |
| return (val < 0 ? val+0x100*1000 : val) / 1000; |
| } |
| |
| /* |
| * Functions declaration |
| */ |
| |
| static int max1619_probe(struct i2c_client *client, |
| const struct i2c_device_id *id); |
| static int max1619_detect(struct i2c_client *client, |
| struct i2c_board_info *info); |
| static void max1619_init_client(struct i2c_client *client); |
| static int max1619_remove(struct i2c_client *client); |
| static struct max1619_data *max1619_update_device(struct device *dev); |
| |
| /* |
| * Driver data (common to all clients) |
| */ |
| |
| static const struct i2c_device_id max1619_id[] = { |
| { "max1619", max1619 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, max1619_id); |
| |
| static struct i2c_driver max1619_driver = { |
| .class = I2C_CLASS_HWMON, |
| .driver = { |
| .name = "max1619", |
| }, |
| .probe = max1619_probe, |
| .remove = max1619_remove, |
| .id_table = max1619_id, |
| .detect = max1619_detect, |
| .address_data = &addr_data, |
| }; |
| |
| /* |
| * Client data (each client gets its own) |
| */ |
| |
| struct max1619_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 temp_input1; /* local */ |
| u8 temp_input2, temp_low2, temp_high2; /* remote */ |
| u8 temp_crit2; |
| u8 temp_hyst2; |
| u8 alarms; |
| }; |
| |
| /* |
| * Sysfs stuff |
| */ |
| |
| #define show_temp(value) \ |
| static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \ |
| { \ |
| struct max1619_data *data = max1619_update_device(dev); \ |
| return sprintf(buf, "%d\n", temp_from_reg(data->value)); \ |
| } |
| show_temp(temp_input1); |
| show_temp(temp_input2); |
| show_temp(temp_low2); |
| show_temp(temp_high2); |
| show_temp(temp_crit2); |
| show_temp(temp_hyst2); |
| |
| #define set_temp2(value, reg) \ |
| static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \ |
| size_t count) \ |
| { \ |
| struct i2c_client *client = to_i2c_client(dev); \ |
| struct max1619_data *data = i2c_get_clientdata(client); \ |
| long val = simple_strtol(buf, NULL, 10); \ |
| \ |
| mutex_lock(&data->update_lock); \ |
| data->value = temp_to_reg(val); \ |
| i2c_smbus_write_byte_data(client, reg, data->value); \ |
| mutex_unlock(&data->update_lock); \ |
| return count; \ |
| } |
| |
| set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW); |
| set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH); |
| set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT); |
| set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST); |
| |
| static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) |
| { |
| struct max1619_data *data = max1619_update_device(dev); |
| return sprintf(buf, "%d\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 max1619_data *data = max1619_update_device(dev); |
| return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); |
| } |
| |
| static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL); |
| static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL); |
| static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2, |
| set_temp_low2); |
| static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2, |
| set_temp_high2); |
| static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2, |
| set_temp_crit2); |
| static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst2, |
| set_temp_hyst2); |
| static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
| static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1); |
| static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2); |
| static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); |
| static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4); |
| |
| static struct attribute *max1619_attributes[] = { |
| &dev_attr_temp1_input.attr, |
| &dev_attr_temp2_input.attr, |
| &dev_attr_temp2_min.attr, |
| &dev_attr_temp2_max.attr, |
| &dev_attr_temp2_crit.attr, |
| &dev_attr_temp2_crit_hyst.attr, |
| |
| &dev_attr_alarms.attr, |
| &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, |
| &sensor_dev_attr_temp2_fault.dev_attr.attr, |
| &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, |
| &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, |
| NULL |
| }; |
| |
| static const struct attribute_group max1619_group = { |
| .attrs = max1619_attributes, |
| }; |
| |
| /* |
| * Real code |
| */ |
| |
| /* Return 0 if detection is successful, -ENODEV otherwise */ |
| static int max1619_detect(struct i2c_client *client, |
| struct i2c_board_info *info) |
| { |
| struct i2c_adapter *adapter = client->adapter; |
| u8 reg_config, reg_convrate, reg_status, man_id, chip_id; |
| |
| if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
| return -ENODEV; |
| |
| /* detection */ |
| reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); |
| reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE); |
| reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS); |
| if ((reg_config & 0x03) != 0x00 |
| || reg_convrate > 0x07 || (reg_status & 0x61) != 0x00) { |
| dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n", |
| client->addr); |
| return -ENODEV; |
| } |
| |
| /* identification */ |
| man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID); |
| chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID); |
| if (man_id != 0x4D || chip_id != 0x04) { |
| dev_info(&adapter->dev, |
| "Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n", |
| man_id, chip_id); |
| return -ENODEV; |
| } |
| |
| strlcpy(info->type, "max1619", I2C_NAME_SIZE); |
| |
| return 0; |
| } |
| |
| static int max1619_probe(struct i2c_client *new_client, |
| const struct i2c_device_id *id) |
| { |
| struct max1619_data *data; |
| int err; |
| |
| data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL); |
| if (!data) { |
| err = -ENOMEM; |
| goto exit; |
| } |
| |
| i2c_set_clientdata(new_client, data); |
| data->valid = 0; |
| mutex_init(&data->update_lock); |
| |
| /* Initialize the MAX1619 chip */ |
| max1619_init_client(new_client); |
| |
| /* Register sysfs hooks */ |
| if ((err = sysfs_create_group(&new_client->dev.kobj, &max1619_group))) |
| goto exit_free; |
| |
| data->hwmon_dev = hwmon_device_register(&new_client->dev); |
| if (IS_ERR(data->hwmon_dev)) { |
| err = PTR_ERR(data->hwmon_dev); |
| goto exit_remove_files; |
| } |
| |
| return 0; |
| |
| exit_remove_files: |
| sysfs_remove_group(&new_client->dev.kobj, &max1619_group); |
| exit_free: |
| kfree(data); |
| exit: |
| return err; |
| } |
| |
| static void max1619_init_client(struct i2c_client *client) |
| { |
| u8 config; |
| |
| /* |
| * Start the conversions. |
| */ |
| i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE, |
| 5); /* 2 Hz */ |
| config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); |
| if (config & 0x40) |
| i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG, |
| config & 0xBF); /* run */ |
| } |
| |
| static int max1619_remove(struct i2c_client *client) |
| { |
| struct max1619_data *data = i2c_get_clientdata(client); |
| |
| hwmon_device_unregister(data->hwmon_dev); |
| sysfs_remove_group(&client->dev.kobj, &max1619_group); |
| |
| kfree(data); |
| return 0; |
| } |
| |
| static struct max1619_data *max1619_update_device(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct max1619_data *data = i2c_get_clientdata(client); |
| |
| mutex_lock(&data->update_lock); |
| |
| if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { |
| dev_dbg(&client->dev, "Updating max1619 data.\n"); |
| data->temp_input1 = i2c_smbus_read_byte_data(client, |
| MAX1619_REG_R_LOCAL_TEMP); |
| data->temp_input2 = i2c_smbus_read_byte_data(client, |
| MAX1619_REG_R_REMOTE_TEMP); |
| data->temp_high2 = i2c_smbus_read_byte_data(client, |
| MAX1619_REG_R_REMOTE_HIGH); |
| data->temp_low2 = i2c_smbus_read_byte_data(client, |
| MAX1619_REG_R_REMOTE_LOW); |
| data->temp_crit2 = i2c_smbus_read_byte_data(client, |
| MAX1619_REG_R_REMOTE_CRIT); |
| data->temp_hyst2 = i2c_smbus_read_byte_data(client, |
| MAX1619_REG_R_TCRIT_HYST); |
| data->alarms = i2c_smbus_read_byte_data(client, |
| MAX1619_REG_R_STATUS); |
| |
| data->last_updated = jiffies; |
| data->valid = 1; |
| } |
| |
| mutex_unlock(&data->update_lock); |
| |
| return data; |
| } |
| |
| static int __init sensors_max1619_init(void) |
| { |
| return i2c_add_driver(&max1619_driver); |
| } |
| |
| static void __exit sensors_max1619_exit(void) |
| { |
| i2c_del_driver(&max1619_driver); |
| } |
| |
| MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and " |
| "Jean Delvare <khali@linux-fr.org>"); |
| MODULE_DESCRIPTION("MAX1619 sensor driver"); |
| MODULE_LICENSE("GPL"); |
| |
| module_init(sensors_max1619_init); |
| module_exit(sensors_max1619_exit); |