--- /dev/null
+/*
+ * 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/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/i2c-sensor.h>
+
+
+static unsigned short normal_i2c[] = { I2C_CLIENT_END };
+static unsigned short normal_i2c_range[] = { 0x18, 0x1a, 0x29, 0x2b,
+ 0x4c, 0x4e, I2C_CLIENT_END };
+static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
+static unsigned int normal_isa_range[] = { I2C_CLIENT_ISA_END };
+
+/*
+ * Insmod parameters
+ */
+
+SENSORS_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 = {
+ .owner = THIS_MODULE,
+ .name = "max1619",
+ .flags = I2C_DF_NOTIFY,
+ .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 semaphore 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;
+};
+
+/*
+ * Internal variables
+ */
+
+static int max1619_id = 0;
+
+/*
+ * Sysfs stuff
+ */
+
+#define show_temp(value) \
+static ssize_t show_##value(struct device *dev, 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, const char *buf, \
+ size_t count) \
+{ \
+ struct i2c_client *client = to_i2c_client(dev); \
+ struct max1619_data *data = i2c_get_clientdata(client); \
+ data->value = TEMP_TO_REG(simple_strtol(buf, NULL, 10)); \
+ i2c_smbus_write_byte_data(client, reg, data->value); \
+ 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, 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);
+
+/*
+ * Real code
+ */
+
+static int max1619_attach_adapter(struct i2c_adapter *adapter)
+{
+ if (!(adapter->class & I2C_CLASS_HWMON))
+ return 0;
+ return i2c_detect(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;
+ u8 man_id, chip_id;
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ goto exit;
+
+ if (!(data = kmalloc(sizeof(struct max1619_data), GFP_KERNEL))) {
+ err = -ENOMEM;
+ goto exit;
+ }
+ memset(data, 0, sizeof(struct max1619_data));
+
+ /* 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 */
+
+ 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);
+ new_client->id = max1619_id++;
+ data->valid = 0;
+ init_MUTEX(&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 */
+ device_create_file(&new_client->dev, &dev_attr_temp1_input);
+ device_create_file(&new_client->dev, &dev_attr_temp2_input);
+ device_create_file(&new_client->dev, &dev_attr_temp2_min);
+ device_create_file(&new_client->dev, &dev_attr_temp2_max);
+ device_create_file(&new_client->dev, &dev_attr_temp2_crit);
+ device_create_file(&new_client->dev, &dev_attr_temp2_crit_hyst);
+ device_create_file(&new_client->dev, &dev_attr_alarms);
+
+ return 0;
+
+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)
+{
+ int err;
+
+ if ((err = i2c_detach_client(client))) {
+ dev_err(&client->dev, "Client deregistration failed, "
+ "client not detached.\n");
+ return err;
+ }
+
+ kfree(i2c_get_clientdata(client));
+ 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);
+
+ down(&data->update_lock);
+
+ if ((jiffies - data->last_updated > HZ * 2) ||
+ (jiffies < data->last_updated) ||
+ !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;
+ }
+
+ up(&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);
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