1 files changed, 331 insertions, 0 deletions
diff --git a/drivers/hwmon/max1619.c b/drivers/hwmon/max1619.c
new file mode 100644
index 000000000..76d966932
--- /dev/null
+++ b/drivers/hwmon/max1619.c
@@ -0,0 +1,331 @@
+/*
+ * 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 alarms_show(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_RO(alarms);
+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);
+
+#ifdef CONFIG_OF
+static const struct of_device_id max1619_of_match[] = {
+	{ .compatible = "maxim,max1619", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, max1619_of_match);
+#endif
+
+static struct i2c_driver max1619_driver = {
+	.class		= I2C_CLASS_HWMON,
+	.driver = {
+		.name	= "max1619",
+		.of_match_table = of_match_ptr(max1619_of_match),
+	},
+	.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");