/* * 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/err.h> #include <linux/mutex.h> #include <linux/sysfs.h> static 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 and various macros */ #define TEMP_FROM_REG(val) ((val & 0x80 ? val-0x100 : val) * 1000) #define TEMP_TO_REG(val) ((val < 0 ? val+0x100*1000 : val) / 1000) /* * Functions declaration */ static int max1619_attach_adapter(struct i2c_adapter *adapter); static int max1619_detect(struct i2c_adapter *adapter, int address, int kind); static void max1619_init_client(struct i2c_client *client); static int max1619_detach_client(struct i2c_client *client); static struct max1619_data *max1619_update_device(struct device *dev); /* * Driver data (common to all clients) */ static struct i2c_driver max1619_driver = { .driver = { .name = "max1619", }, .attach_adapter = max1619_attach_adapter, .detach_client = max1619_detach_client, }; /* * Client data (each client gets its own) */ struct max1619_data { struct i2c_client client; struct class_device *class_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 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 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, NULL }; static const struct attribute_group max1619_group = { .attrs = max1619_attributes, }; /* * Real code */ static int max1619_attach_adapter(struct i2c_adapter *adapter) { if (!(adapter->class & I2C_CLASS_HWMON)) return 0; return i2c_probe(adapter, &addr_data, max1619_detect); } /* * The following function does more than just detection. If detection * succeeds, it also registers the new chip. */ static int max1619_detect(struct i2c_adapter *adapter, int address, int kind) { struct i2c_client *new_client; struct max1619_data *data; int err = 0; const char *name = ""; u8 reg_config=0, reg_convrate=0, reg_status=0; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) goto exit; if (!(data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL))) { err = -ENOMEM; goto exit; } /* The common I2C client data is placed right before the MAX1619-specific data. */ new_client = &data->client; i2c_set_clientdata(new_client, data); new_client->addr = address; new_client->adapter = adapter; new_client->driver = &max1619_driver; new_client->flags = 0; /* * Now we do the remaining detection. A negative kind means that * the driver was loaded with no force parameter (default), so we * must both detect and identify the chip. A zero kind means that * the driver was loaded with the force parameter, the detection * step shall be skipped. A positive kind means that the driver * was loaded with the force parameter and a given kind of chip is * requested, so both the detection and the identification steps * are skipped. */ if (kind < 0) { /* detection */ reg_config = i2c_smbus_read_byte_data(new_client, MAX1619_REG_R_CONFIG); reg_convrate = i2c_smbus_read_byte_data(new_client, MAX1619_REG_R_CONVRATE); reg_status = i2c_smbus_read_byte_data(new_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", address); goto exit_free; } } if (kind <= 0) { /* identification */ u8 man_id, chip_id; man_id = i2c_smbus_read_byte_data(new_client, MAX1619_REG_R_MAN_ID); chip_id = i2c_smbus_read_byte_data(new_client, MAX1619_REG_R_CHIP_ID); if ((man_id == 0x4D) && (chip_id == 0x04)) kind = max1619; if (kind <= 0) { /* identification failed */ dev_info(&adapter->dev, "Unsupported chip (man_id=0x%02X, " "chip_id=0x%02X).\n", man_id, chip_id); goto exit_free; } } if (kind == max1619) name = "max1619"; /* We can fill in the remaining client fields */ strlcpy(new_client->name, name, I2C_NAME_SIZE); data->valid = 0; mutex_init(&data->update_lock); /* Tell the I2C layer a new client has arrived */ if ((err = i2c_attach_client(new_client))) goto exit_free; /* 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_detach; data->class_dev = hwmon_device_register(&new_client->dev); if (IS_ERR(data->class_dev)) { err = PTR_ERR(data->class_dev); goto exit_remove_files; } return 0; exit_remove_files: sysfs_remove_group(&new_client->dev.kobj, &max1619_group); exit_detach: i2c_detach_client(new_client); 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_detach_client(struct i2c_client *client) { struct max1619_data *data = i2c_get_clientdata(client); int err; hwmon_device_unregister(data->class_dev); sysfs_remove_group(&client->dev.kobj, &max1619_group); if ((err = i2c_detach_client(client))) return err; 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);