hwmon: (tmp401) Add support for TMP432

TMP432 is similar to TMP431 with a second external temperature sensor.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>

3 files changed, 165 insertions, 40 deletions

diff --git a/Documentation/hwmon/tmp401 b/Documentation/hwmon/tmp401
index 12e4781..f91e3fa 100644
--- a/Documentation/hwmon/tmp401
+++ b/Documentation/hwmon/tmp401
@@ -14,6 +14,10 @@ Supported chips:
     Prefix: 'tmp431'
     Addresses scanned: I2C 0x4c, 0x4d
     Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp431.html
+  * Texas Instruments TMP432
+    Prefix: 'tmp432'
+    Addresses scanned: I2C 0x4c, 0x4d
+    Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp432.html
 
 Authors:
          Hans de Goede <hdegoede@redhat.com>
@@ -23,8 +27,8 @@ Description
 -----------
 
 This driver implements support for Texas Instruments TMP401, TMP411,
-and TMP431 chips. These chips implement one remote and one local
-temperature sensor. Temperature is measured in degrees
+TMP431, and TMP432 chips. These chips implement one or two remote and
+one local temperature sensors. Temperature is measured in degrees
 Celsius. Resolution of the remote sensor is 0.0625 degree. Local
 sensor resolution can be set to 0.5, 0.25, 0.125 or 0.0625 degree (not
 supported by the driver so far, so using the default resolution of 0.5
@@ -44,3 +48,6 @@ some additional features.
 
   Exported via sysfs attribute temp_reset_history. Writing 1 to this
   file triggers a reset.
+
+TMP432 is compatible with TMP401 and TMP431. It supports two external
+temperature sensors.
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 26ebff0..4f29117 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1249,7 +1249,7 @@ config SENSORS_TMP401
 	depends on I2C
 	help
 	  If you say yes here you get support for Texas Instruments TMP401,
-	  TMP411, and TMP431 temperature sensor chips.
+	  TMP411, TMP431, and TMP432 temperature sensor chips.
 
 	  This driver can also be built as a module.  If so, the module
 	  will be called tmp401.
diff --git a/drivers/hwmon/tmp401.c b/drivers/hwmon/tmp401.c
index fa6af51..a478454 100644
--- a/drivers/hwmon/tmp401.c
+++ b/drivers/hwmon/tmp401.c
@@ -5,6 +5,9 @@
  * Gabriel Konat, Sander Leget, Wouter Willems
  * Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>
  *
+ * Cleanup and support for TMP431 and TMP432 by Guenter Roeck
+ * Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>
+ *
  * 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
@@ -43,7 +46,7 @@
 /* Addresses to scan */
 static const unsigned short normal_i2c[] = { 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
 
-enum chips { tmp401, tmp411, tmp431 };
+enum chips { tmp401, tmp411, tmp431, tmp432 };
 
 /*
  * The TMP401 registers, note some registers have different addresses for
@@ -85,6 +88,30 @@ static const u8 TMP401_TEMP_LSB[6][2] = {
 	{ 0x33, 0x37 },	/* highest */
 };
 
+static const u8 TMP432_TEMP_MSB_READ[4][3] = {
+	{ 0x00, 0x01, 0x23 },	/* temp */
+	{ 0x06, 0x08, 0x16 },	/* low limit */
+	{ 0x05, 0x07, 0x15 },	/* high limit */
+	{ 0x20, 0x19, 0x1A },	/* therm (crit) limit */
+};
+
+static const u8 TMP432_TEMP_MSB_WRITE[4][3] = {
+	{ 0, 0, 0 },		/* temp  - unused */
+	{ 0x0C, 0x0E, 0x16 },	/* low limit */
+	{ 0x0B, 0x0D, 0x15 },	/* high limit */
+	{ 0x20, 0x19, 0x1A },	/* therm (crit) limit */
+};
+
+static const u8 TMP432_TEMP_LSB[3][3] = {
+	{ 0x29, 0x10, 0x24 },	/* temp */
+	{ 0x3E, 0x14, 0x18 },	/* low limit */
+	{ 0x3D, 0x13, 0x17 },	/* high limit */
+};
+
+/* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
+static const u8 TMP432_STATUS_REG[] = {
+	0x1b, 0x36, 0x35, 0x37 };
+
 /* Flags */
 #define TMP401_CONFIG_RANGE			BIT(2)
 #define TMP401_CONFIG_SHUTDOWN			BIT(6)
@@ -96,6 +123,11 @@ static const u8 TMP401_TEMP_LSB[6][2] = {
 #define TMP401_STATUS_LOCAL_LOW			BIT(5)
 #define TMP401_STATUS_LOCAL_HIGH		BIT(6)
 
+/* On TMP432, each status has its own register */
+#define TMP432_STATUS_LOCAL			BIT(0)
+#define TMP432_STATUS_REMOTE1			BIT(1)
+#define TMP432_STATUS_REMOTE2			BIT(2)
+
 /* Manufacturer / Device ID's */
 #define TMP401_MANUFACTURER_ID			0x55
 #define TMP401_DEVICE_ID			0x11
@@ -103,6 +135,7 @@ static const u8 TMP401_TEMP_LSB[6][2] = {
 #define TMP411B_DEVICE_ID			0x13
 #define TMP411C_DEVICE_ID			0x10
 #define TMP431_DEVICE_ID			0x31
+#define TMP432_DEVICE_ID			0x32
 
 /*
  * Driver data (common to all clients)
@@ -112,6 +145,7 @@ static const struct i2c_device_id tmp401_id[] = {
 	{ "tmp401", tmp401 },
 	{ "tmp411", tmp411 },
 	{ "tmp431", tmp431 },
+	{ "tmp432", tmp432 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, tmp401_id);
@@ -130,9 +164,9 @@ struct tmp401_data {
 	unsigned int update_interval;	/* in milliseconds */
 
 	/* register values */
-	u8 status;
+	u8 status[4];
 	u8 config;
-	u16 temp[6][2];
+	u16 temp[6][3];
 	u8 temp_crit_hyst;
 };
 
@@ -166,22 +200,27 @@ static int tmp401_update_device_reg16(struct i2c_client *client,
 {
 	int i, j, val;
 	int num_regs = data->kind == tmp411 ? 6 : 4;
+	int num_sensors = data->kind == tmp432 ? 3 : 2;
 
-	for (i = 0; i < 2; i++) {			/* local / rem1 */
+	for (i = 0; i < num_sensors; i++) {		/* local / r1 / r2 */
 		for (j = 0; j < num_regs; j++) {	/* temp / low / ... */
+			u8 regaddr;
 			/*
 			 * High byte must be read first immediately followed
 			 * by the low byte
 			 */
-			val = i2c_smbus_read_byte_data(client,
-						TMP401_TEMP_MSB_READ[j][i]);
+			regaddr = data->kind == tmp432 ?
+						TMP432_TEMP_MSB_READ[j][i] :
+						TMP401_TEMP_MSB_READ[j][i];
+			val = i2c_smbus_read_byte_data(client, regaddr);
 			if (val < 0)
 				return val;
 			data->temp[j][i] = val << 8;
 			if (j == 3)		/* crit is msb only */
 				continue;
-			val = i2c_smbus_read_byte_data(client,
-						TMP401_TEMP_LSB[j][i]);
+			regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[j][i]
+						       : TMP401_TEMP_LSB[j][i];
+			val = i2c_smbus_read_byte_data(client, regaddr);
 			if (val < 0)
 				return val;
 			data->temp[j][i] |= val;
@@ -195,7 +234,7 @@ 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);
 	struct tmp401_data *ret = data;
-	int val;
+	int i, val;
 	unsigned long next_update;
 
 	mutex_lock(&data->update_lock);
@@ -203,12 +242,38 @@ static struct tmp401_data *tmp401_update_device(struct device *dev)
 	next_update = data->last_updated +
 		      msecs_to_jiffies(data->update_interval) + 1;
 	if (time_after(jiffies, next_update) || !data->valid) {
-		val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
-		if (val < 0) {
-			ret = ERR_PTR(val);
-			goto abort;
+		if (data->kind != tmp432) {
+			/*
+			 * The driver uses the TMP432 status format internally.
+			 * Convert status to TMP432 format for other chips.
+			 */
+			val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
+			if (val < 0) {
+				ret = ERR_PTR(val);
+				goto abort;
+			}
+			data->status[0] =
+			  (val & TMP401_STATUS_REMOTE_OPEN) >> 1;
+			data->status[1] =
+			  ((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
+			  ((val & TMP401_STATUS_LOCAL_LOW) >> 5);
+			data->status[2] =
+			  ((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
+			  ((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
+			data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
+						| TMP401_STATUS_REMOTE_CRIT);
+		} else {
+			for (i = 0; i < ARRAY_SIZE(data->status); i++) {
+				val = i2c_smbus_read_byte_data(client,
+							TMP432_STATUS_REG[i]);
+				if (val < 0) {
+					ret = ERR_PTR(val);
+					goto abort;
+				}
+				data->status[i] = val;
+			}
 		}
-		data->status = val;
+
 		val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 		if (val < 0) {
 			ret = ERR_PTR(val);
@@ -270,13 +335,14 @@ static ssize_t show_temp_crit_hyst(struct device *dev,
 static ssize_t show_status(struct device *dev,
 	struct device_attribute *devattr, char *buf)
 {
-	int mask = to_sensor_dev_attr(devattr)->index;
+	int nr = to_sensor_dev_attr_2(devattr)->nr;
+	int mask = to_sensor_dev_attr_2(devattr)->index;
 	struct tmp401_data *data = tmp401_update_device(dev);
 
 	if (IS_ERR(data))
 		return PTR_ERR(data);
 
-	return sprintf(buf, "%d\n", !!(data->status & mask));
+	return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
 }
 
 static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
@@ -288,6 +354,7 @@ static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
 	struct tmp401_data *data = tmp401_update_device(dev);
 	long val;
 	u16 reg;
+	u8 regaddr;
 
 	if (IS_ERR(data))
 		return PTR_ERR(data);
@@ -299,13 +366,13 @@ static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
 
 	mutex_lock(&data->update_lock);
 
-	i2c_smbus_write_byte_data(client,
-				  TMP401_TEMP_MSB_WRITE[nr][index],
-				  reg >> 8);
+	regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
+				       : TMP401_TEMP_MSB_WRITE[nr][index];
+	i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
 	if (nr != 3) {
-		i2c_smbus_write_byte_data(client,
-					  TMP401_TEMP_LSB[nr][index],
-					  reg & 0xFF);
+		regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[nr][index]
+					       : TMP401_TEMP_LSB[nr][index];
+		i2c_smbus_write_byte_data(client, regaddr, reg & 0xFF);
 	}
 	data->temp[nr][index] = reg;
 
@@ -426,12 +493,12 @@ static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IWUSR | S_IRUGO, show_temp,
 			    store_temp, 3, 0);
 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO,
 			  show_temp_crit_hyst, store_temp_crit_hyst, 0);
-static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_status, NULL,
-			  TMP401_STATUS_LOCAL_LOW);
-static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_status, NULL,
-			  TMP401_STATUS_LOCAL_HIGH);
-static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_status, NULL,
-			  TMP401_STATUS_LOCAL_CRIT);
+static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_status, NULL,
+			    1, TMP432_STATUS_LOCAL);
+static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_status, NULL,
+			    2, TMP432_STATUS_LOCAL);
+static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_status, NULL,
+			    3, TMP432_STATUS_LOCAL);
 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
 static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp,
 			    store_temp, 1, 1);
@@ -441,14 +508,14 @@ static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IWUSR | S_IRUGO, show_temp,
 			    store_temp, 3, 1);
 static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst,
 			  NULL, 1);
-static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_status, NULL,
-			  TMP401_STATUS_REMOTE_OPEN);
-static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_status, NULL,
-			  TMP401_STATUS_REMOTE_LOW);
-static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_status, NULL,
-			  TMP401_STATUS_REMOTE_HIGH);
-static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_status, NULL,
-			  TMP401_STATUS_REMOTE_CRIT);
+static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_status, NULL,
+			    0, TMP432_STATUS_REMOTE1);
+static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_status, NULL,
+			    1, TMP432_STATUS_REMOTE1);
+static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_status, NULL,
+			    2, TMP432_STATUS_REMOTE1);
+static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_status, NULL,
+			    3, TMP432_STATUS_REMOTE1);
 
 static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
 		   set_update_interval);
@@ -509,6 +576,42 @@ static const struct attribute_group tmp411_group = {
 	.attrs = tmp411_attributes,
 };
 
+static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0, 2);
+static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp,
+			    store_temp, 1, 2);
+static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp,
+			    store_temp, 2, 2);
+static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
+			    store_temp, 3, 2);
+static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temp_crit_hyst,
+			  NULL, 2);
+static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_status, NULL,
+			    0, TMP432_STATUS_REMOTE2);
+static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_status, NULL,
+			    1, TMP432_STATUS_REMOTE2);
+static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_status, NULL,
+			    2, TMP432_STATUS_REMOTE2);
+static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_status, NULL,
+			    3, TMP432_STATUS_REMOTE2);
+
+static struct attribute *tmp432_attributes[] = {
+	&sensor_dev_attr_temp3_input.dev_attr.attr,
+	&sensor_dev_attr_temp3_min.dev_attr.attr,
+	&sensor_dev_attr_temp3_max.dev_attr.attr,
+	&sensor_dev_attr_temp3_crit.dev_attr.attr,
+	&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
+	&sensor_dev_attr_temp3_fault.dev_attr.attr,
+	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
+
+	NULL
+};
+
+static const struct attribute_group tmp432_group = {
+	.attrs = tmp432_attributes,
+};
+
 /*
  * Begin non sysfs callback code (aka Real code)
  */
@@ -579,6 +682,11 @@ static int tmp401_detect(struct i2c_client *client,
 			return -ENODEV;
 		kind = tmp431;
 		break;
+	case TMP432_DEVICE_ID:
+		if (client->addr == 0x4e)
+			return -ENODEV;
+		kind = tmp432;
+		break;
 	default:
 		return -ENODEV;
 	}
@@ -610,6 +718,9 @@ static int tmp401_remove(struct i2c_client *client)
 	if (data->kind == tmp411)
 		sysfs_remove_group(&dev->kobj, &tmp411_group);
 
+	if (data->kind == tmp432)
+		sysfs_remove_group(&dev->kobj, &tmp432_group);
+
 	return 0;
 }
 
@@ -619,7 +730,7 @@ static int tmp401_probe(struct i2c_client *client,
 	struct device *dev = &client->dev;
 	int err;
 	struct tmp401_data *data;
-	const char *names[] = { "TMP401", "TMP411", "TMP431" };
+	const char *names[] = { "TMP401", "TMP411", "TMP431", "TMP432" };
 
 	data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
 	if (!data)
@@ -644,6 +755,13 @@ static int tmp401_probe(struct i2c_client *client,
 			goto exit_remove;
 	}
 
+	/* Register additional tmp432 sysfs hooks */
+	if (data->kind == tmp432) {
+		err = sysfs_create_group(&dev->kobj, &tmp432_group);
+		if (err)
+			goto exit_remove;
+	}
+
 	data->hwmon_dev = hwmon_device_register(dev);
 	if (IS_ERR(data->hwmon_dev)) {
 		err = PTR_ERR(data->hwmon_dev);