hwmon: (tmp401) Add support for TI's TMP411 sensors chip

This adds support for TI's TMP411 sensor chip.

Preliminary support were done by Gabriel Konat, Sander Leget and
Wouter Willems. The chip is compatible with TI's TMP401 sensor
chip. It has additional support for historical minimun/maximum
measurements.
Signed-off-by: Andre Prendel <andre.prendel@gmx.de>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/hwmon/tmp401.c

 /* tmp401.c
  *
  * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com>
+ * Preliminary tmp411 support by:
+ * Gabriel Konat, Sander Leget, Wouter Willems
+ * Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>
  *
  * 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
@@ -40,8 +43,7 @@
 static const unsigned short normal_i2c[] = { 0x4c, I2C_CLIENT_END };
 
 /* Insmod parameters */
-I2C_CLIENT_INSMOD_1(tmp401);
-
+I2C_CLIENT_INSMOD_2(tmp401, tmp411);
 
 /*
  * The TMP401 registers, note some registers have different addresses for
@@ -56,6 +58,7 @@ I2C_CLIENT_INSMOD_1(tmp401);
 #define TMP401_CONSECUTIVE_ALERT		0x22
 #define TMP401_MANUFACTURER_ID_REG		0xFE
 #define TMP401_DEVICE_ID_REG			0xFF
+#define TMP411_N_FACTOR_REG			0x18
 
 static const u8 TMP401_TEMP_MSB[2]			= { 0x00, 0x01 };
 static const u8 TMP401_TEMP_LSB[2]			= { 0x15, 0x10 };
@@ -68,6 +71,11 @@ static const u8 TMP401_TEMP_HIGH_LIMIT_LSB[2]		= { 0x16, 0x13 };
 /* These are called the THERM limit / hysteresis / mask in the datasheet */
 static const u8 TMP401_TEMP_CRIT_LIMIT[2]		= { 0x20, 0x19 };
 
+static const u8 TMP411_TEMP_LOWEST_MSB[2]		= { 0x30, 0x34 };
+static const u8 TMP411_TEMP_LOWEST_LSB[2]		= { 0x31, 0x35 };
+static const u8 TMP411_TEMP_HIGHEST_MSB[2]		= { 0x32, 0x36 };
+static const u8 TMP411_TEMP_HIGHEST_LSB[2]		= { 0x33, 0x37 };
+
 /* Flags */
 #define TMP401_CONFIG_RANGE		0x04
 #define TMP401_CONFIG_SHUTDOWN		0x40
@@ -82,6 +90,7 @@ static const u8 TMP401_TEMP_CRIT_LIMIT[2]		= { 0x20, 0x19 };
 /* Manufacturer / Device ID's */
 #define TMP401_MANUFACTURER_ID			0x55
 #define TMP401_DEVICE_ID			0x11
+#define TMP411_DEVICE_ID			0x12
 
 /*
  * Functions declarations
@@ -100,6 +109,7 @@ static struct tmp401_data *tmp401_update_device(struct device *dev);
 
 static const struct i2c_device_id tmp401_id[] = {
 	{ "tmp401", tmp401 },
+	{ "tmp411", tmp411 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, tmp401_id);
@@ -125,6 +135,7 @@ struct tmp401_data {
 	struct mutex update_lock;
 	char valid; /* zero until following fields are valid */
 	unsigned long last_updated; /* in jiffies */
+	int kind;
 
 	/* register values */
 	u8 status;
@@ -134,6 +145,8 @@ struct tmp401_data {
 	u16 temp_high[2];
 	u8 temp_crit[2];
 	u8 temp_crit_hyst;
+	u16 temp_lowest[2];
+	u16 temp_highest[2];
 };
 
 /*
@@ -238,6 +251,28 @@ static ssize_t show_temp_crit_hyst(struct device *dev,
 	return sprintf(buf, "%d\n", temp);
 }
 
+static ssize_t show_temp_lowest(struct device *dev,
+	struct device_attribute *devattr, char *buf)
+{
+	int index = to_sensor_dev_attr(devattr)->index;
+	struct tmp401_data *data = tmp401_update_device(dev);
+
+	return sprintf(buf, "%d\n",
+		tmp401_register_to_temp(data->temp_lowest[index],
+					data->config));
+}
+
+static ssize_t show_temp_highest(struct device *dev,
+	struct device_attribute *devattr, char *buf)
+{
+	int index = to_sensor_dev_attr(devattr)->index;
+	struct tmp401_data *data = tmp401_update_device(dev);
+
+	return sprintf(buf, "%d\n",
+		tmp401_register_to_temp(data->temp_highest[index],
+					data->config));
+}
+
 static ssize_t show_status(struct device *dev,
 	struct device_attribute *devattr, char *buf)
 {
@@ -361,6 +396,30 @@ static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
 	return count;
 }
 
+/*
+ * Resets the historical measurements of minimum and maximum temperatures.
+ * This is done by writing any value to any of the minimum/maximum registers
+ * (0x30-0x37).
+ */
+static ssize_t reset_temp_history(struct device *dev,
+	struct device_attribute	*devattr, const char *buf, size_t count)
+{
+	long val;
+
+	if (strict_strtol(buf, 10, &val))
+		return -EINVAL;
+
+	if (val != 1) {
+		dev_err(dev, "temp_reset_history value %ld not"
+			" supported. Use 1 to reset the history!\n", val);
+		return -EINVAL;
+	}
+	i2c_smbus_write_byte_data(to_i2c_client(dev),
+		TMP411_TEMP_LOWEST_MSB[0], val);
+
+	return count;
+}
+
 static struct sensor_device_attribute tmp401_attr[] = {
 	SENSOR_ATTR(temp1_input, 0444, show_temp_value, NULL, 0),
 	SENSOR_ATTR(temp1_min, 0644, show_temp_min, store_temp_min, 0),
@@ -389,6 +448,21 @@ static struct sensor_device_attribute tmp401_attr[] = {
 		    TMP401_STATUS_REMOTE_CRIT),
 };
 
+/*
+ * Additional features of the TMP411 chip.
+ * The TMP411 stores the minimum and maximum
+ * temperature measured since power-on, chip-reset, or
+ * minimum and maximum register reset for both the local
+ * and remote channels.
+ */
+static struct sensor_device_attribute tmp411_attr[] = {
+	SENSOR_ATTR(temp1_highest, 0444, show_temp_highest, NULL, 0),
+	SENSOR_ATTR(temp1_lowest, 0444, show_temp_lowest, NULL, 0),
+	SENSOR_ATTR(temp2_highest, 0444, show_temp_highest, NULL, 1),
+	SENSOR_ATTR(temp2_lowest, 0444, show_temp_lowest, NULL, 1),
+	SENSOR_ATTR(temp_reset_history, 0200, NULL, reset_temp_history, 0),
+};
+
 /*
  * Begin non sysfs callback code (aka Real code)
  */
@@ -432,8 +506,17 @@ static int tmp401_detect(struct i2c_client *client, int kind,
 			return -ENODEV;
 
 		reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
-		if (reg != TMP401_DEVICE_ID)
+
+		switch (reg) {
+		case TMP401_DEVICE_ID:
+			kind = tmp401;
+			break;
+		case TMP411_DEVICE_ID:
+			kind = tmp411;
+			break;
+		default:
 			return -ENODEV;
+		}
 
 		reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 		if (reg & 0x1b)
@@ -441,10 +524,11 @@ static int tmp401_detect(struct i2c_client *client, int kind,
 
 		reg = i2c_smbus_read_byte_data(client,
 					       TMP401_CONVERSION_RATE_READ);
+		/* Datasheet says: 0x1-0x6 */
 		if (reg > 15)
 			return -ENODEV;
 	}
-	strlcpy(info->type, "tmp401", I2C_NAME_SIZE);
+	strlcpy(info->type, tmp401_id[kind - 1].name, I2C_NAME_SIZE);
 
 	return 0;
 }
@@ -454,6 +538,7 @@ static int tmp401_probe(struct i2c_client *client,
 {
 	int i, err = 0;
 	struct tmp401_data *data;
+	const char *names[] = { "TMP401", "TMP411" };
 
 	data = kzalloc(sizeof(struct tmp401_data), GFP_KERNEL);
 	if (!data)
@@ -461,6 +546,7 @@ static int tmp401_probe(struct i2c_client *client,
 
 	i2c_set_clientdata(client, data);
 	mutex_init(&data->update_lock);
+	data->kind = id->driver_data;
 
 	/* Initialize the TMP401 chip */
 	tmp401_init_client(client);
@@ -473,6 +559,16 @@ static int tmp401_probe(struct i2c_client *client,
 			goto exit_remove;
 	}
 
+	/* Register aditional tmp411 sysfs hooks */
+	if (data->kind == tmp411) {
+		for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++) {
+			err = device_create_file(&client->dev,
+						 &tmp411_attr[i].dev_attr);
+			if (err)
+				goto exit_remove;
+		}
+	}
+
 	data->hwmon_dev = hwmon_device_register(&client->dev);
 	if (IS_ERR(data->hwmon_dev)) {
 		err = PTR_ERR(data->hwmon_dev);
@@ -480,7 +576,8 @@ static int tmp401_probe(struct i2c_client *client,
 		goto exit_remove;
 	}
 
-	dev_info(&client->dev, "Detected TI TMP401 chip\n");
+	dev_info(&client->dev, "Detected TI %s chip\n",
+		 names[data->kind - 1]);
 
 	return 0;
 
@@ -500,15 +597,60 @@ static int tmp401_remove(struct i2c_client *client)
 	for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++)
 		device_remove_file(&client->dev, &tmp401_attr[i].dev_attr);
 
+	if (data->kind == tmp411) {
+		for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++)
+			device_remove_file(&client->dev,
+					   &tmp411_attr[i].dev_attr);
+	}
+
 	kfree(data);
 	return 0;
 }
 
+static struct tmp401_data *tmp401_update_device_reg16(
+	struct i2c_client *client, struct tmp401_data *data)
+{
+	int i;
+
+	for (i = 0; i < 2; i++) {
+		/*
+		 * High byte must be read first immediately followed
+		 * by the low byte
+		 */
+		data->temp[i] = i2c_smbus_read_byte_data(client,
+			TMP401_TEMP_MSB[i]) << 8;
+		data->temp[i] |= i2c_smbus_read_byte_data(client,
+			TMP401_TEMP_LSB[i]);
+		data->temp_low[i] = i2c_smbus_read_byte_data(client,
+			TMP401_TEMP_LOW_LIMIT_MSB_READ[i]) << 8;
+		data->temp_low[i] |= i2c_smbus_read_byte_data(client,
+			TMP401_TEMP_LOW_LIMIT_LSB[i]);
+		data->temp_high[i] = i2c_smbus_read_byte_data(client,
+			TMP401_TEMP_HIGH_LIMIT_MSB_READ[i]) << 8;
+		data->temp_high[i] |= i2c_smbus_read_byte_data(client,
+			TMP401_TEMP_HIGH_LIMIT_LSB[i]);
+		data->temp_crit[i] = i2c_smbus_read_byte_data(client,
+			TMP401_TEMP_CRIT_LIMIT[i]);
+
+		if (data->kind == tmp411) {
+			data->temp_lowest[i] = i2c_smbus_read_byte_data(client,
+				TMP411_TEMP_LOWEST_MSB[i]) << 8;
+			data->temp_lowest[i] |= i2c_smbus_read_byte_data(
+				client, TMP411_TEMP_LOWEST_LSB[i]);
+
+			data->temp_highest[i] = i2c_smbus_read_byte_data(
+				client, TMP411_TEMP_HIGHEST_MSB[i]) << 8;
+			data->temp_highest[i] |= i2c_smbus_read_byte_data(
+				client, TMP411_TEMP_HIGHEST_LSB[i]);
+		}
+	}
+	return data;
+}
+
 static struct tmp401_data *tmp401_update_device(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct tmp401_data *data = i2c_get_clientdata(client);
-	int i;
 
 	mutex_lock(&data->update_lock);
 
@@ -516,24 +658,7 @@ static struct tmp401_data *tmp401_update_device(struct device *dev)
 		data->status = i2c_smbus_read_byte_data(client, TMP401_STATUS);
 		data->config = i2c_smbus_read_byte_data(client,
 						TMP401_CONFIG_READ);
-		for (i = 0; i < 2; i++) {
-			/* High byte must be read first immediately followed
-			   by the low byte */
-			data->temp[i] = i2c_smbus_read_byte_data(client,
-						TMP401_TEMP_MSB[i]) << 8;
-			data->temp[i] |= i2c_smbus_read_byte_data(client,
-						TMP401_TEMP_LSB[i]);
-			data->temp_low[i] = i2c_smbus_read_byte_data(client,
-				TMP401_TEMP_LOW_LIMIT_MSB_READ[i]) << 8;
-			data->temp_low[i] |= i2c_smbus_read_byte_data(client,
-						TMP401_TEMP_LOW_LIMIT_LSB[i]);
-			data->temp_high[i] = i2c_smbus_read_byte_data(client,
-				TMP401_TEMP_HIGH_LIMIT_MSB_READ[i]) << 8;
-			data->temp_high[i] |= i2c_smbus_read_byte_data(client,
-						TMP401_TEMP_HIGH_LIMIT_LSB[i]);
-			data->temp_crit[i] = i2c_smbus_read_byte_data(client,
-						TMP401_TEMP_CRIT_LIMIT[i]);
-		}
+		tmp401_update_device_reg16(client, data);
 
 		data->temp_crit_hyst = i2c_smbus_read_byte_data(client,
 						TMP401_TEMP_CRIT_HYST);