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drivers/hwmon/max1619.c
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/* * 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. */ |
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#include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/jiffies.h> #include <linux/i2c.h> |
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#include <linux/hwmon.h> |
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#include <linux/hwmon-sysfs.h> |
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#include <linux/err.h> |
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#include <linux/mutex.h> |
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#include <linux/sysfs.h> |
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static const unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; |
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/* |
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* 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 /* |
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* Conversions |
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*/ |
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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; } |
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/* * Functions declaration */ |
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static int max1619_probe(struct i2c_client *client, const struct i2c_device_id *id); |
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static int max1619_detect(struct i2c_client *client, |
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struct i2c_board_info *info); |
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static void max1619_init_client(struct i2c_client *client); |
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static int max1619_remove(struct i2c_client *client); |
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static struct max1619_data *max1619_update_device(struct device *dev); /* * Driver data (common to all clients) */ |
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static const struct i2c_device_id max1619_id[] = { |
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{ "max1619", 0 }, |
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{ } }; MODULE_DEVICE_TABLE(i2c, max1619_id); |
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static struct i2c_driver max1619_driver = { |
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.class = I2C_CLASS_HWMON, |
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.driver = { |
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.name = "max1619", }, |
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.probe = max1619_probe, .remove = max1619_remove, .id_table = max1619_id, .detect = max1619_detect, |
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.address_list = normal_i2c, |
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}; /* * Client data (each client gets its own) */ struct max1619_data { |
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struct device *hwmon_dev; |
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struct mutex update_lock; |
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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) \ |
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static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \ |
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{ \ struct max1619_data *data = max1619_update_device(dev); \ |
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return sprintf(buf, "%d ", temp_from_reg(data->value)); \ |
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} 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) \ |
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static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \ |
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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); \ \ |
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mutex_lock(&data->update_lock); \ |
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data->value = temp_to_reg(val); \ |
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i2c_smbus_write_byte_data(client, reg, data->value); \ |
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mutex_unlock(&data->update_lock); \ |
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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); |
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static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) |
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{ struct max1619_data *data = max1619_update_device(dev); return sprintf(buf, "%d ", data->alarms); } |
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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 ", (data->alarms >> bitnr) & 1); } |
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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); |
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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); |
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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, |
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&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, |
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NULL }; static const struct attribute_group max1619_group = { .attrs = max1619_attributes, }; |
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/* * Real code */ |
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/* Return 0 if detection is successful, -ENODEV otherwise */ |
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static int max1619_detect(struct i2c_client *client, |
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struct i2c_board_info *info) |
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{ |
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struct i2c_adapter *adapter = client->adapter; u8 reg_config, reg_convrate, reg_status, man_id, chip_id; |
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|
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
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return -ENODEV; |
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|
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/* 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 ", client->addr); return -ENODEV; |
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} |
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/* 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). ", man_id, chip_id); return -ENODEV; |
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} |
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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; } |
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i2c_set_clientdata(new_client, data); |
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data->valid = 0; |
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mutex_init(&data->update_lock); |
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/* Initialize the MAX1619 chip */ max1619_init_client(new_client); /* Register sysfs hooks */ |
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if ((err = sysfs_create_group(&new_client->dev.kobj, &max1619_group))) |
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goto exit_free; |
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data->hwmon_dev = hwmon_device_register(&new_client->dev); if (IS_ERR(data->hwmon_dev)) { err = PTR_ERR(data->hwmon_dev); |
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goto exit_remove_files; |
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} |
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return 0; |
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exit_remove_files: sysfs_remove_group(&new_client->dev.kobj, &max1619_group); |
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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 */ } |
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static int max1619_remove(struct i2c_client *client) |
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{ |
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struct max1619_data *data = i2c_get_clientdata(client); |
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hwmon_device_unregister(data->hwmon_dev); |
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sysfs_remove_group(&client->dev.kobj, &max1619_group); |
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kfree(data); |
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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); |
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mutex_lock(&data->update_lock); |
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if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { dev_dbg(&client->dev, "Updating max1619 data. "); 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; } |
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mutex_unlock(&data->update_lock); |
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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); } |
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MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and " |
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"Jean Delvare <khali@linux-fr.org>"); MODULE_DESCRIPTION("MAX1619 sensor driver"); MODULE_LICENSE("GPL"); module_init(sensors_max1619_init); module_exit(sensors_max1619_exit); |