--- /dev/null
+/*
+ * max1619.c - Part of lm_sensors, Linux kernel modules for hardware
+ * monitoring
+ * Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net>
+ * Jean Delvare <jdelvare@suse.de>
+ *
+ * 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.
+ */
+
+#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 };
+
+/*
+ * 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;
+}
+
+enum temp_index {
+ t_input1 = 0,
+ t_input2,
+ t_low2,
+ t_high2,
+ t_crit2,
+ t_hyst2,
+ t_num_regs
+};
+
+/*
+ * Client data (each client gets its own)
+ */
+
+struct max1619_data {
+ struct i2c_client *client;
+ struct mutex update_lock;
+ char valid; /* zero until following fields are valid */
+ unsigned long last_updated; /* in jiffies */
+
+ /* registers values */
+ u8 temp[t_num_regs]; /* index with enum temp_index */
+ u8 alarms;
+};
+
+static const u8 regs_read[t_num_regs] = {
+ [t_input1] = MAX1619_REG_R_LOCAL_TEMP,
+ [t_input2] = MAX1619_REG_R_REMOTE_TEMP,
+ [t_low2] = MAX1619_REG_R_REMOTE_LOW,
+ [t_high2] = MAX1619_REG_R_REMOTE_HIGH,
+ [t_crit2] = MAX1619_REG_R_REMOTE_CRIT,
+ [t_hyst2] = MAX1619_REG_R_TCRIT_HYST,
+};
+
+static const u8 regs_write[t_num_regs] = {
+ [t_low2] = MAX1619_REG_W_REMOTE_LOW,
+ [t_high2] = MAX1619_REG_W_REMOTE_HIGH,
+ [t_crit2] = MAX1619_REG_W_REMOTE_CRIT,
+ [t_hyst2] = MAX1619_REG_W_TCRIT_HYST,
+};
+
+static struct max1619_data *max1619_update_device(struct device *dev)
+{
+ struct max1619_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ int config, i;
+
+ mutex_lock(&data->update_lock);
+
+ if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
+ dev_dbg(&client->dev, "Updating max1619 data.\n");
+ for (i = 0; i < t_num_regs; i++)
+ data->temp[i] = i2c_smbus_read_byte_data(client,
+ regs_read[i]);
+ data->alarms = i2c_smbus_read_byte_data(client,
+ MAX1619_REG_R_STATUS);
+ /* If OVERT polarity is low, reverse alarm bit */
+ config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
+ if (!(config & 0x20))
+ data->alarms ^= 0x02;
+
+ data->last_updated = jiffies;
+ data->valid = 1;
+ }
+
+ mutex_unlock(&data->update_lock);
+
+ return data;
+}
+
+/*
+ * Sysfs stuff
+ */
+
+static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct max1619_data *data = max1619_update_device(dev);
+
+ return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
+}
+
+static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
+ const char *buf, size_t count)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct max1619_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ long val;
+ int err = kstrtol(buf, 10, &val);
+ if (err)
+ return err;
+
+ mutex_lock(&data->update_lock);
+ data->temp[attr->index] = temp_to_reg(val);
+ i2c_smbus_write_byte_data(client, regs_write[attr->index],
+ data->temp[attr->index]);
+ mutex_unlock(&data->update_lock);
+ return count;
+}
+
+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 SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, t_input1);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, t_input2);
+static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp, set_temp,
+ t_low2);
+static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp, set_temp,
+ t_high2);
+static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp, set_temp,
+ t_crit2);
+static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp,
+ set_temp, t_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_attrs[] = {
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp2_input.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_crit_hyst.dev_attr.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
+};
+ATTRIBUTE_GROUPS(max1619);
+
+/* 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 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_probe(struct i2c_client *new_client,
+ const struct i2c_device_id *id)
+{
+ struct max1619_data *data;
+ struct device *hwmon_dev;
+
+ data = devm_kzalloc(&new_client->dev, sizeof(struct max1619_data),
+ GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->client = new_client;
+ mutex_init(&data->update_lock);
+
+ /* Initialize the MAX1619 chip */
+ max1619_init_client(new_client);
+
+ hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,
+ new_client->name,
+ data,
+ max1619_groups);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct i2c_device_id max1619_id[] = {
+ { "max1619", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, max1619_id);
+
+static struct i2c_driver max1619_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "max1619",
+ },
+ .probe = max1619_probe,
+ .id_table = max1619_id,
+ .detect = max1619_detect,
+ .address_list = normal_i2c,
+};
+
+module_i2c_driver(max1619_driver);
+
+MODULE_AUTHOR("Oleksij Rempel <bug-track@fisher-privat.net>, Jean Delvare <jdelvare@suse.de>");
+MODULE_DESCRIPTION("MAX1619 sensor driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff