Merge tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/ker…

…nel/git/groeck/linux-staging

Pull hwmon updates from Guenter Roeck:
 - new driver for Sensirion SHTC1 humidity / temperature sensor
 - convert ltc4151 and vexpress drivers to use devm functions
 - drop generic chip detection from lm85 driver
 - avoid forward declarations in atxp1 driver
 - fix sign extensions in ina2xx driver

* tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: vexpress: Use devm helper for hwmon device registration
  hwmon: (atxp1) Avoid forward declaration
  hwmon: add support for Sensirion SHTC1 sensor
  hwmon: (ltc4151) Convert to devm_hwmon_device_register_with_groups
  hwmon: (lm85) Drop generic detection
  hwmon: (ina2xx) Cast to s16 on shunt and current regs

Documentation/hwmon/shtc1

@@ -0,0 +1,43 @@
+Kernel driver shtc1
+===================
+
+Supported chips:
+  * Sensirion SHTC1
+    Prefix: 'shtc1'
+    Addresses scanned: none
+    Datasheet: http://www.sensirion.com/file/datasheet_shtc1
+
+  * Sensirion SHTW1
+    Prefix: 'shtw1'
+    Addresses scanned: none
+    Datasheet: Not publicly available
+
+Author:
+  Johannes Winkelmann <[email protected]>
+
+Description
+-----------
+
+This driver implements support for the Sensirion SHTC1 chip, a humidity and
+temperature sensor. Temperature is measured in degrees celsius, relative
+humidity is expressed as a percentage. Driver can be used as well for SHTW1
+chip, which has the same electrical interface.
+
+The device communicates with the I2C protocol. All sensors are set to I2C
+address 0x70. See Documentation/i2c/instantiating-devices for methods to
+instantiate the device.
+
+There are two options configurable by means of shtc1_platform_data:
+1. blocking (pull the I2C clock line down while performing the measurement) or
+   non-blocking mode. Blocking mode will guarantee the fastest result but
+   the I2C bus will be busy during that time. By default, non-blocking mode
+   is used. Make sure clock-stretching works properly on your device if you
+   want to use blocking mode.
+2. high or low accuracy. High accuracy is used by default and using it is
+   strongly recommended.
+
+sysfs-Interface
+---------------
+
+temp1_input - temperature input
+humidity1_input - humidity input

drivers/hwmon/Kconfig

@@ -1124,6 +1124,16 @@ config SENSORS_SHT21
 	  This driver can also be built as a module.  If so, the module
 	  will be called sht21.
 
+config SENSORS_SHTC1
+	tristate "Sensiron humidity and temperature sensors. SHTC1 and compat."
+	depends on I2C
+	help
+	  If you say yes here you get support for the Sensiron SHTC1 and SHTW1
+	  humidity and temperature sensors.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called shtc1.
+
 config SENSORS_S3C
 	tristate "Samsung built-in ADC"
 	depends on S3C_ADC

drivers/hwmon/Makefile

@@ -126,6 +126,7 @@ obj-$(CONFIG_SENSORS_SCH5627)	+= sch5627.o
 obj-$(CONFIG_SENSORS_SCH5636)	+= sch5636.o
 obj-$(CONFIG_SENSORS_SHT15)	+= sht15.o
 obj-$(CONFIG_SENSORS_SHT21)	+= sht21.o
+obj-$(CONFIG_SENSORS_SHTC1)	+= shtc1.o
 obj-$(CONFIG_SENSORS_SIS5595)	+= sis5595.o
 obj-$(CONFIG_SENSORS_SMM665)	+= smm665.o
 obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o

drivers/hwmon/atxp1.c

@@ -45,30 +45,6 @@ MODULE_AUTHOR("Sebastian Witt <[email protected]>");
 
 static const unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END };
 
-static int atxp1_probe(struct i2c_client *client,
-		       const struct i2c_device_id *id);
-static int atxp1_remove(struct i2c_client *client);
-static struct atxp1_data *atxp1_update_device(struct device *dev);
-static int atxp1_detect(struct i2c_client *client, struct i2c_board_info *info);
-
-static const struct i2c_device_id atxp1_id[] = {
-	{ "atxp1", 0 },
-	{ }
-};
-MODULE_DEVICE_TABLE(i2c, atxp1_id);
-
-static struct i2c_driver atxp1_driver = {
-	.class		= I2C_CLASS_HWMON,
-	.driver = {
-		.name	= "atxp1",
-	},
-	.probe		= atxp1_probe,
-	.remove		= atxp1_remove,
-	.id_table	= atxp1_id,
-	.detect		= atxp1_detect,
-	.address_list	= normal_i2c,
-};
-
 struct atxp1_data {
 	struct device *hwmon_dev;
 	struct mutex update_lock;
@@ -386,4 +362,22 @@ static int atxp1_remove(struct i2c_client *client)
 	return 0;
 };
 
+static const struct i2c_device_id atxp1_id[] = {
+	{ "atxp1", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, atxp1_id);
+
+static struct i2c_driver atxp1_driver = {
+	.class		= I2C_CLASS_HWMON,
+	.driver = {
+		.name	= "atxp1",
+	},
+	.probe		= atxp1_probe,
+	.remove		= atxp1_remove,
+	.id_table	= atxp1_id,
+	.detect		= atxp1_detect,
+	.address_list	= normal_i2c,
+};
+
 module_i2c_driver(atxp1_driver);

drivers/hwmon/ina2xx.c

@@ -148,7 +148,8 @@ static int ina2xx_get_value(struct ina2xx_data *data, u8 reg)
 
 	switch (reg) {
 	case INA2XX_SHUNT_VOLTAGE:
-		val = DIV_ROUND_CLOSEST(data->regs[reg],
+		/* signed register */
+		val = DIV_ROUND_CLOSEST((s16)data->regs[reg],
 					data->config->shunt_div);
 		break;
 	case INA2XX_BUS_VOLTAGE:
@@ -160,8 +161,8 @@ static int ina2xx_get_value(struct ina2xx_data *data, u8 reg)
 		val = data->regs[reg] * data->config->power_lsb;
 		break;
 	case INA2XX_CURRENT:
-		/* LSB=1mA (selected). Is in mA */
-		val = data->regs[reg];
+		/* signed register, LSB=1mA (selected), in mA */
+		val = (s16)data->regs[reg];
 		break;
 	default:
 		/* programmer goofed */

drivers/hwmon/lm85.c

@@ -5,7 +5,7 @@
  * Copyright (c) 2002, 2003  Philip Pokorny <[email protected]>
  * Copyright (c) 2003        Margit Schubert-While <[email protected]>
  * Copyright (c) 2004        Justin Thiessen <[email protected]>
- * Copyright (C) 2007--2009  Jean Delvare <[email protected]>
+ * Copyright (C) 2007--2014  Jean Delvare <[email protected]>
  *
  * Chip details at	      <http://www.national.com/ds/LM/LM85.pdf>
  *
@@ -39,7 +39,7 @@
 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
 
 enum chips {
-	any_chip, lm85b, lm85c,
+	lm85,
 	adm1027, adt7463, adt7468,
 	emc6d100, emc6d102, emc6d103, emc6d103s
 };
@@ -75,9 +75,6 @@ enum chips {
 #define LM85_COMPANY_NATIONAL		0x01
 #define LM85_COMPANY_ANALOG_DEV		0x41
 #define LM85_COMPANY_SMSC		0x5c
-#define LM85_VERSTEP_VMASK              0xf0
-#define LM85_VERSTEP_GENERIC		0x60
-#define LM85_VERSTEP_GENERIC2		0x70
 #define LM85_VERSTEP_LM85C		0x60
 #define LM85_VERSTEP_LM85B		0x62
 #define LM85_VERSTEP_LM96000_1		0x68
@@ -351,9 +348,9 @@ static const struct i2c_device_id lm85_id[] = {
 	{ "adm1027", adm1027 },
 	{ "adt7463", adt7463 },
 	{ "adt7468", adt7468 },
-	{ "lm85", any_chip },
-	{ "lm85b", lm85b },
-	{ "lm85c", lm85c },
+	{ "lm85", lm85 },
+	{ "lm85b", lm85 },
+	{ "lm85c", lm85 },
 	{ "emc6d100", emc6d100 },
 	{ "emc6d101", emc6d100 },
 	{ "emc6d102", emc6d102 },
@@ -1281,7 +1278,7 @@ static int lm85_detect(struct i2c_client *client, struct i2c_board_info *info)
 {
 	struct i2c_adapter *adapter = client->adapter;
 	int address = client->addr;
-	const char *type_name;
+	const char *type_name = NULL;
 	int company, verstep;
 
 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
@@ -1297,16 +1294,6 @@ static int lm85_detect(struct i2c_client *client, struct i2c_board_info *info)
 		"Detecting device at 0x%02x with COMPANY: 0x%02x and VERSTEP: 0x%02x\n",
 		address, company, verstep);
 
-	/* All supported chips have the version in common */
-	if ((verstep & LM85_VERSTEP_VMASK) != LM85_VERSTEP_GENERIC &&
-	    (verstep & LM85_VERSTEP_VMASK) != LM85_VERSTEP_GENERIC2) {
-		dev_dbg(&adapter->dev,
-			"Autodetection failed: unsupported version\n");
-		return -ENODEV;
-	}
-	type_name = "lm85";
-
-	/* Now, refine the detection */
 	if (company == LM85_COMPANY_NATIONAL) {
 		switch (verstep) {
 		case LM85_VERSTEP_LM85C:
@@ -1323,6 +1310,7 @@ static int lm85_detect(struct i2c_client *client, struct i2c_board_info *info)
 					"Found Winbond WPCD377I, ignoring\n");
 				return -ENODEV;
 			}
+			type_name = "lm85";
 			break;
 		}
 	} else if (company == LM85_COMPANY_ANALOG_DEV) {
@@ -1357,12 +1345,11 @@ static int lm85_detect(struct i2c_client *client, struct i2c_board_info *info)
 			type_name = "emc6d103s";
 			break;
 		}
-	} else {
-		dev_dbg(&adapter->dev,
-			"Autodetection failed: unknown vendor\n");
-		return -ENODEV;
 	}
 
+	if (!type_name)
+		return -ENODEV;
+
 	strlcpy(info->type, type_name, I2C_NAME_SIZE);
 
 	return 0;

drivers/hwmon/ltc4151.c

@@ -47,7 +47,7 @@
 #define LTC4151_ADIN_L	0x05
 
 struct ltc4151_data {
-	struct device *hwmon_dev;
+	struct i2c_client *client;
 
 	struct mutex update_lock;
 	bool valid;
@@ -59,8 +59,8 @@ struct ltc4151_data {
 
 static struct ltc4151_data *ltc4151_update_device(struct device *dev)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct ltc4151_data *data = i2c_get_clientdata(client);
+	struct ltc4151_data *data = dev_get_drvdata(dev);
+	struct i2c_client *client = data->client;
 	struct ltc4151_data *ret = data;
 
 	mutex_lock(&data->update_lock);
@@ -159,62 +159,38 @@ static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ltc4151_show_value, NULL,
  * Finally, construct an array of pointers to members of the above objects,
  * as required for sysfs_create_group()
  */
-static struct attribute *ltc4151_attributes[] = {
+static struct attribute *ltc4151_attrs[] = {
 	&sensor_dev_attr_in1_input.dev_attr.attr,
 	&sensor_dev_attr_in2_input.dev_attr.attr,
 
 	&sensor_dev_attr_curr1_input.dev_attr.attr,
 
 	NULL,
 };
-
-static const struct attribute_group ltc4151_group = {
-	.attrs = ltc4151_attributes,
-};
+ATTRIBUTE_GROUPS(ltc4151);
 
 static int ltc4151_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
 	struct i2c_adapter *adapter = client->adapter;
+	struct device *dev = &client->dev;
 	struct ltc4151_data *data;
-	int ret;
+	struct device *hwmon_dev;
 
 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 		return -ENODEV;
 
-	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
 
-	i2c_set_clientdata(client, data);
+	data->client = client;
 	mutex_init(&data->update_lock);
 
-	/* Register sysfs hooks */
-	ret = sysfs_create_group(&client->dev.kobj, &ltc4151_group);
-	if (ret)
-		return ret;
-
-	data->hwmon_dev = hwmon_device_register(&client->dev);
-	if (IS_ERR(data->hwmon_dev)) {
-		ret = PTR_ERR(data->hwmon_dev);
-		goto out_hwmon_device_register;
-	}
-
-	return 0;
-
-out_hwmon_device_register:
-	sysfs_remove_group(&client->dev.kobj, &ltc4151_group);
-	return ret;
-}
-
-static int ltc4151_remove(struct i2c_client *client)
-{
-	struct ltc4151_data *data = i2c_get_clientdata(client);
-
-	hwmon_device_unregister(data->hwmon_dev);
-	sysfs_remove_group(&client->dev.kobj, &ltc4151_group);
-
-	return 0;
+	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
+							   data,
+							   ltc4151_groups);
+	return PTR_ERR_OR_ZERO(hwmon_dev);
 }
 
 static const struct i2c_device_id ltc4151_id[] = {
@@ -229,7 +205,6 @@ static struct i2c_driver ltc4151_driver = {
 		.name	= "ltc4151",
 	},
 	.probe		= ltc4151_probe,
-	.remove		= ltc4151_remove,
 	.id_table	= ltc4151_id,
 };