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From: Guenter Roeck <linux@roeck-us.net>
To: Jonathan Cameron <jic23@kernel.org>
Cc: devicetree@vger.kernel.org, linux-hwmon@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org,
	Guenter Roeck <linux@roeck-us.net>, Dirk Eibach <eibach@gdsys.de>
Subject: [PATCH] hwmon: Remove ads1015 driver
Date: Mon,  1 Jul 2019 11:12:38 -0700
Message-ID: <1562004758-13025-1-git-send-email-linux@roeck-us.net> (raw)

A driver for ADS1015 with more functionality is available in the iio
subsystem.

Remove the hwmon driver as duplicate. If the chip is used for hardware
monitoring, the iio->hwmon bridge should be used.

Cc: Dirk Eibach <eibach@gdsys.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
Current plan is to queue this removal for v5.4 (not v5.3) in the hwmon
tree.

 .../devicetree/bindings/hwmon/ads1015.txt          |  73 -----
 .../devicetree/bindings/iio/adc/ads1015.txt        |  73 +++++
 Documentation/hwmon/ads1015.rst                    |  90 ------
 Documentation/hwmon/index.rst                      |   1 -
 MAINTAINERS                                        |   8 -
 drivers/hwmon/Kconfig                              |  10 -
 drivers/hwmon/Makefile                             |   1 -
 drivers/hwmon/ads1015.c                            | 324 ---------------------
 drivers/iio/adc/Kconfig                            |   2 +-
 9 files changed, 74 insertions(+), 508 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/hwmon/ads1015.txt
 create mode 100644 Documentation/devicetree/bindings/iio/adc/ads1015.txt
 delete mode 100644 Documentation/hwmon/ads1015.rst
 delete mode 100644 drivers/hwmon/ads1015.c

diff --git a/Documentation/devicetree/bindings/hwmon/ads1015.txt b/Documentation/devicetree/bindings/hwmon/ads1015.txt
deleted file mode 100644
index 918a507d1159..000000000000
--- a/Documentation/devicetree/bindings/hwmon/ads1015.txt
+++ /dev/null
@@ -1,73 +0,0 @@
-ADS1015 (I2C)
-
-This device is a 12-bit A-D converter with 4 inputs.
-
-The inputs can be used single ended or in certain differential combinations.
-
-For configuration all possible combinations are mapped to 8 channels:
-  0: Voltage over AIN0 and AIN1.
-  1: Voltage over AIN0 and AIN3.
-  2: Voltage over AIN1 and AIN3.
-  3: Voltage over AIN2 and AIN3.
-  4: Voltage over AIN0 and GND.
-  5: Voltage over AIN1 and GND.
-  6: Voltage over AIN2 and GND.
-  7: Voltage over AIN3 and GND.
-
-Each channel can be configured individually:
- - pga is the programmable gain amplifier (values are full scale)
-    0: +/- 6.144 V
-    1: +/- 4.096 V
-    2: +/- 2.048 V (default)
-    3: +/- 1.024 V
-    4: +/- 0.512 V
-    5: +/- 0.256 V
- - data_rate in samples per second
-    0: 128
-    1: 250
-    2: 490
-    3: 920
-    4: 1600 (default)
-    5: 2400
-    6: 3300
-
-1) The /ads1015 node
-
-  Required properties:
-
-   - compatible : must be "ti,ads1015"
-   - reg : I2C bus address of the device
-   - #address-cells : must be <1>
-   - #size-cells : must be <0>
-
-  The node contains child nodes for each channel that the platform uses.
-
-  Example ADS1015 node:
-
-    ads1015@49 {
-	    compatible = "ti,ads1015";
-	    reg = <0x49>;
-	    #address-cells = <1>;
-	    #size-cells = <0>;
-
-	    [ child node definitions... ]
-    }
-
-2) channel nodes
-
-  Required properties:
-
-   - reg : the channel number
-
-  Optional properties:
-
-   - ti,gain : the programmable gain amplifier setting
-   - ti,datarate : the converter data rate
-
-  Example ADS1015 channel node:
-
-    channel@4 {
-	    reg = <4>;
-	    ti,gain = <3>;
-	    ti,datarate = <5>;
-    };
diff --git a/Documentation/devicetree/bindings/iio/adc/ads1015.txt b/Documentation/devicetree/bindings/iio/adc/ads1015.txt
new file mode 100644
index 000000000000..918a507d1159
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/ads1015.txt
@@ -0,0 +1,73 @@
+ADS1015 (I2C)
+
+This device is a 12-bit A-D converter with 4 inputs.
+
+The inputs can be used single ended or in certain differential combinations.
+
+For configuration all possible combinations are mapped to 8 channels:
+  0: Voltage over AIN0 and AIN1.
+  1: Voltage over AIN0 and AIN3.
+  2: Voltage over AIN1 and AIN3.
+  3: Voltage over AIN2 and AIN3.
+  4: Voltage over AIN0 and GND.
+  5: Voltage over AIN1 and GND.
+  6: Voltage over AIN2 and GND.
+  7: Voltage over AIN3 and GND.
+
+Each channel can be configured individually:
+ - pga is the programmable gain amplifier (values are full scale)
+    0: +/- 6.144 V
+    1: +/- 4.096 V
+    2: +/- 2.048 V (default)
+    3: +/- 1.024 V
+    4: +/- 0.512 V
+    5: +/- 0.256 V
+ - data_rate in samples per second
+    0: 128
+    1: 250
+    2: 490
+    3: 920
+    4: 1600 (default)
+    5: 2400
+    6: 3300
+
+1) The /ads1015 node
+
+  Required properties:
+
+   - compatible : must be "ti,ads1015"
+   - reg : I2C bus address of the device
+   - #address-cells : must be <1>
+   - #size-cells : must be <0>
+
+  The node contains child nodes for each channel that the platform uses.
+
+  Example ADS1015 node:
+
+    ads1015@49 {
+	    compatible = "ti,ads1015";
+	    reg = <0x49>;
+	    #address-cells = <1>;
+	    #size-cells = <0>;
+
+	    [ child node definitions... ]
+    }
+
+2) channel nodes
+
+  Required properties:
+
+   - reg : the channel number
+
+  Optional properties:
+
+   - ti,gain : the programmable gain amplifier setting
+   - ti,datarate : the converter data rate
+
+  Example ADS1015 channel node:
+
+    channel@4 {
+	    reg = <4>;
+	    ti,gain = <3>;
+	    ti,datarate = <5>;
+    };
diff --git a/Documentation/hwmon/ads1015.rst b/Documentation/hwmon/ads1015.rst
deleted file mode 100644
index e0951c4e57bb..000000000000
--- a/Documentation/hwmon/ads1015.rst
+++ /dev/null
@@ -1,90 +0,0 @@
-Kernel driver ads1015
-=====================
-
-Supported chips:
-
-  * Texas Instruments ADS1015
-
-    Prefix: 'ads1015'
-
-    Datasheet: Publicly available at the Texas Instruments website:
-
-	       http://focus.ti.com/lit/ds/symlink/ads1015.pdf
-
-  * Texas Instruments ADS1115
-
-    Prefix: 'ads1115'
-
-    Datasheet: Publicly available at the Texas Instruments website:
-
-	       http://focus.ti.com/lit/ds/symlink/ads1115.pdf
-
-Authors:
-	Dirk Eibach, Guntermann & Drunck GmbH <eibach@gdsys.de>
-
-Description
------------
-
-This driver implements support for the Texas Instruments ADS1015/ADS1115.
-
-This device is a 12/16-bit A-D converter with 4 inputs.
-
-The inputs can be used single ended or in certain differential combinations.
-
-The inputs can be made available by 8 sysfs input files in0_input - in7_input:
-
-  - in0: Voltage over AIN0 and AIN1.
-  - in1: Voltage over AIN0 and AIN3.
-  - in2: Voltage over AIN1 and AIN3.
-  - in3: Voltage over AIN2 and AIN3.
-  - in4: Voltage over AIN0 and GND.
-  - in5: Voltage over AIN1 and GND.
-  - in6: Voltage over AIN2 and GND.
-  - in7: Voltage over AIN3 and GND.
-
-Which inputs are available can be configured using platform data or devicetree.
-
-By default all inputs are exported.
-
-Platform Data
--------------
-
-In linux/platform_data/ads1015.h platform data is defined, channel_data contains
-configuration data for the used input combinations:
-
-- pga is the programmable gain amplifier (values are full scale)
-
-    - 0: +/- 6.144 V
-    - 1: +/- 4.096 V
-    - 2: +/- 2.048 V
-    - 3: +/- 1.024 V
-    - 4: +/- 0.512 V
-    - 5: +/- 0.256 V
-
-- data_rate in samples per second
-
-    - 0: 128
-    - 1: 250
-    - 2: 490
-    - 3: 920
-    - 4: 1600
-    - 5: 2400
-    - 6: 3300
-
-Example::
-
-  struct ads1015_platform_data data = {
-	.channel_data = {
-		[2] = { .enabled = true, .pga = 1, .data_rate = 0 },
-		[4] = { .enabled = true, .pga = 4, .data_rate = 5 },
-	}
-  };
-
-In this case only in2_input (FS +/- 4.096 V, 128 SPS) and in4_input
-(FS +/- 0.512 V, 2400 SPS) would be created.
-
-Devicetree
-----------
-
-Configuration is also possible via devicetree:
-Documentation/devicetree/bindings/hwmon/ads1015.txt
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index ee090e51653a..1d301d0e6f4d 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -30,7 +30,6 @@ Hardware Monitoring Kernel Drivers
    adm1031
    adm1275
    adm9240
-   ads1015
    ads7828
    adt7410
    adt7411
diff --git a/MAINTAINERS b/MAINTAINERS
index 01a52fc964da..11744a3735f0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -517,14 +517,6 @@ W:	http://ez.analog.com/community/linux-device-drivers
 S:	Supported
 F:	drivers/video/backlight/adp8860_bl.c
 
-ADS1015 HARDWARE MONITOR DRIVER
-M:	Dirk Eibach <eibach@gdsys.de>
-L:	linux-hwmon@vger.kernel.org
-S:	Maintained
-F:	Documentation/hwmon/ads1015.rst
-F:	drivers/hwmon/ads1015.c
-F:	include/linux/platform_data/ads1015.h
-
 ADT746X FAN DRIVER
 M:	Colin Leroy <colin@colino.net>
 S:	Maintained
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 650dd71f9724..76cd0647ee2c 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1570,16 +1570,6 @@ config SENSORS_ADC128D818
 	  This driver can also be built as a module. If so, the module
 	  will be called adc128d818.
 
-config SENSORS_ADS1015
-	tristate "Texas Instruments ADS1015"
-	depends on I2C
-	help
-	  If you say yes here you get support for Texas Instruments
-	  ADS1015/ADS1115 12/16-bit 4-input ADC device.
-
-	  This driver can also be built as a module. If so, the module
-	  will be called ads1015.
-
 config SENSORS_ADS7828
 	tristate "Texas Instruments ADS7828 and compatibles"
 	depends on I2C
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 8db472ea04f0..6a52a964038b 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -35,7 +35,6 @@ obj-$(CONFIG_SENSORS_ADM1026)	+= adm1026.o
 obj-$(CONFIG_SENSORS_ADM1029)	+= adm1029.o
 obj-$(CONFIG_SENSORS_ADM1031)	+= adm1031.o
 obj-$(CONFIG_SENSORS_ADM9240)	+= adm9240.o
-obj-$(CONFIG_SENSORS_ADS1015)	+= ads1015.o
 obj-$(CONFIG_SENSORS_ADS7828)	+= ads7828.o
 obj-$(CONFIG_SENSORS_ADS7871)	+= ads7871.o
 obj-$(CONFIG_SENSORS_ADT7X10)	+= adt7x10.o
diff --git a/drivers/hwmon/ads1015.c b/drivers/hwmon/ads1015.c
deleted file mode 100644
index 3727a3762eb8..000000000000
--- a/drivers/hwmon/ads1015.c
+++ /dev/null
@@ -1,324 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * ads1015.c - lm_sensors driver for ads1015 12-bit 4-input ADC
- * (C) Copyright 2010
- * Dirk Eibach, Guntermann & Drunck GmbH <eibach@gdsys.de>
- *
- * Based on the ads7828 driver by Steve Hardy.
- *
- * Datasheet available at: http://focus.ti.com/lit/ds/symlink/ads1015.pdf
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/delay.h>
-#include <linux/i2c.h>
-#include <linux/hwmon.h>
-#include <linux/hwmon-sysfs.h>
-#include <linux/err.h>
-#include <linux/mutex.h>
-#include <linux/of_device.h>
-#include <linux/of.h>
-
-#include <linux/platform_data/ads1015.h>
-
-/* ADS1015 registers */
-enum {
-	ADS1015_CONVERSION = 0,
-	ADS1015_CONFIG = 1,
-};
-
-/* PGA fullscale voltages in mV */
-static const unsigned int fullscale_table[8] = {
-	6144, 4096, 2048, 1024, 512, 256, 256, 256 };
-
-/* Data rates in samples per second */
-static const unsigned int data_rate_table_1015[8] = {
-	128, 250, 490, 920, 1600, 2400, 3300, 3300
-};
-
-static const unsigned int data_rate_table_1115[8] = {
-	8, 16, 32, 64, 128, 250, 475, 860
-};
-
-#define ADS1015_DEFAULT_CHANNELS 0xff
-#define ADS1015_DEFAULT_PGA 2
-#define ADS1015_DEFAULT_DATA_RATE 4
-
-enum ads1015_chips {
-	ads1015,
-	ads1115,
-};
-
-struct ads1015_data {
-	struct device *hwmon_dev;
-	struct mutex update_lock; /* mutex protect updates */
-	struct ads1015_channel_data channel_data[ADS1015_CHANNELS];
-	enum ads1015_chips id;
-};
-
-static int ads1015_read_adc(struct i2c_client *client, unsigned int channel)
-{
-	u16 config;
-	struct ads1015_data *data = i2c_get_clientdata(client);
-	unsigned int pga = data->channel_data[channel].pga;
-	unsigned int data_rate = data->channel_data[channel].data_rate;
-	unsigned int conversion_time_ms;
-	const unsigned int * const rate_table = data->id == ads1115 ?
-		data_rate_table_1115 : data_rate_table_1015;
-	int res;
-
-	mutex_lock(&data->update_lock);
-
-	/* get channel parameters */
-	res = i2c_smbus_read_word_swapped(client, ADS1015_CONFIG);
-	if (res < 0)
-		goto err_unlock;
-	config = res;
-	conversion_time_ms = DIV_ROUND_UP(1000, rate_table[data_rate]);
-
-	/* setup and start single conversion */
-	config &= 0x001f;
-	config |= (1 << 15) | (1 << 8);
-	config |= (channel & 0x0007) << 12;
-	config |= (pga & 0x0007) << 9;
-	config |= (data_rate & 0x0007) << 5;
-
-	res = i2c_smbus_write_word_swapped(client, ADS1015_CONFIG, config);
-	if (res < 0)
-		goto err_unlock;
-
-	/* wait until conversion finished */
-	msleep(conversion_time_ms);
-	res = i2c_smbus_read_word_swapped(client, ADS1015_CONFIG);
-	if (res < 0)
-		goto err_unlock;
-	config = res;
-	if (!(config & (1 << 15))) {
-		/* conversion not finished in time */
-		res = -EIO;
-		goto err_unlock;
-	}
-
-	res = i2c_smbus_read_word_swapped(client, ADS1015_CONVERSION);
-
-err_unlock:
-	mutex_unlock(&data->update_lock);
-	return res;
-}
-
-static int ads1015_reg_to_mv(struct i2c_client *client, unsigned int channel,
-			     s16 reg)
-{
-	struct ads1015_data *data = i2c_get_clientdata(client);
-	unsigned int pga = data->channel_data[channel].pga;
-	int fullscale = fullscale_table[pga];
-	const int mask = data->id == ads1115 ? 0x7fff : 0x7ff0;
-
-	return DIV_ROUND_CLOSEST(reg * fullscale, mask);
-}
-
-/* sysfs callback function */
-static ssize_t in_show(struct device *dev, struct device_attribute *da,
-		       char *buf)
-{
-	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
-	struct i2c_client *client = to_i2c_client(dev);
-	int res;
-	int index = attr->index;
-
-	res = ads1015_read_adc(client, index);
-	if (res < 0)
-		return res;
-
-	return sprintf(buf, "%d\n", ads1015_reg_to_mv(client, index, res));
-}
-
-static const struct sensor_device_attribute ads1015_in[] = {
-	SENSOR_ATTR_RO(in0_input, in, 0),
-	SENSOR_ATTR_RO(in1_input, in, 1),
-	SENSOR_ATTR_RO(in2_input, in, 2),
-	SENSOR_ATTR_RO(in3_input, in, 3),
-	SENSOR_ATTR_RO(in4_input, in, 4),
-	SENSOR_ATTR_RO(in5_input, in, 5),
-	SENSOR_ATTR_RO(in6_input, in, 6),
-	SENSOR_ATTR_RO(in7_input, in, 7),
-};
-
-/*
- * Driver interface
- */
-
-static int ads1015_remove(struct i2c_client *client)
-{
-	struct ads1015_data *data = i2c_get_clientdata(client);
-	int k;
-
-	hwmon_device_unregister(data->hwmon_dev);
-	for (k = 0; k < ADS1015_CHANNELS; ++k)
-		device_remove_file(&client->dev, &ads1015_in[k].dev_attr);
-	return 0;
-}
-
-#ifdef CONFIG_OF
-static int ads1015_get_channels_config_of(struct i2c_client *client)
-{
-	struct ads1015_data *data = i2c_get_clientdata(client);
-	struct device_node *node;
-
-	if (!client->dev.of_node
-	    || !of_get_next_child(client->dev.of_node, NULL))
-		return -EINVAL;
-
-	for_each_child_of_node(client->dev.of_node, node) {
-		u32 pval;
-		unsigned int channel;
-		unsigned int pga = ADS1015_DEFAULT_PGA;
-		unsigned int data_rate = ADS1015_DEFAULT_DATA_RATE;
-
-		if (of_property_read_u32(node, "reg", &pval)) {
-			dev_err(&client->dev, "invalid reg on %pOF\n", node);
-			continue;
-		}
-
-		channel = pval;
-		if (channel >= ADS1015_CHANNELS) {
-			dev_err(&client->dev,
-				"invalid channel index %d on %pOF\n",
-				channel, node);
-			continue;
-		}
-
-		if (!of_property_read_u32(node, "ti,gain", &pval)) {
-			pga = pval;
-			if (pga > 6) {
-				dev_err(&client->dev, "invalid gain on %pOF\n",
-					node);
-				return -EINVAL;
-			}
-		}
-
-		if (!of_property_read_u32(node, "ti,datarate", &pval)) {
-			data_rate = pval;
-			if (data_rate > 7) {
-				dev_err(&client->dev,
-					"invalid data_rate on %pOF\n", node);
-				return -EINVAL;
-			}
-		}
-
-		data->channel_data[channel].enabled = true;
-		data->channel_data[channel].pga = pga;
-		data->channel_data[channel].data_rate = data_rate;
-	}
-
-	return 0;
-}
-#endif
-
-static void ads1015_get_channels_config(struct i2c_client *client)
-{
-	unsigned int k;
-	struct ads1015_data *data = i2c_get_clientdata(client);
-	struct ads1015_platform_data *pdata = dev_get_platdata(&client->dev);
-
-	/* prefer platform data */
-	if (pdata) {
-		memcpy(data->channel_data, pdata->channel_data,
-		       sizeof(data->channel_data));
-		return;
-	}
-
-#ifdef CONFIG_OF
-	if (!ads1015_get_channels_config_of(client))
-		return;
-#endif
-
-	/* fallback on default configuration */
-	for (k = 0; k < ADS1015_CHANNELS; ++k) {
-		data->channel_data[k].enabled = true;
-		data->channel_data[k].pga = ADS1015_DEFAULT_PGA;
-		data->channel_data[k].data_rate = ADS1015_DEFAULT_DATA_RATE;
-	}
-}
-
-static int ads1015_probe(struct i2c_client *client,
-			 const struct i2c_device_id *id)
-{
-	struct ads1015_data *data;
-	int err;
-	unsigned int k;
-
-	data = devm_kzalloc(&client->dev, sizeof(struct ads1015_data),
-			    GFP_KERNEL);
-	if (!data)
-		return -ENOMEM;
-
-	if (client->dev.of_node)
-		data->id = (enum ads1015_chips)
-			of_device_get_match_data(&client->dev);
-	else
-		data->id = id->driver_data;
-	i2c_set_clientdata(client, data);
-	mutex_init(&data->update_lock);
-
-	/* build sysfs attribute group */
-	ads1015_get_channels_config(client);
-	for (k = 0; k < ADS1015_CHANNELS; ++k) {
-		if (!data->channel_data[k].enabled)
-			continue;
-		err = device_create_file(&client->dev, &ads1015_in[k].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);
-		goto exit_remove;
-	}
-
-	return 0;
-
-exit_remove:
-	for (k = 0; k < ADS1015_CHANNELS; ++k)
-		device_remove_file(&client->dev, &ads1015_in[k].dev_attr);
-	return err;
-}
-
-static const struct i2c_device_id ads1015_id[] = {
-	{ "ads1015",  ads1015},
-	{ "ads1115",  ads1115},
-	{ }
-};
-MODULE_DEVICE_TABLE(i2c, ads1015_id);
-
-static const struct of_device_id __maybe_unused ads1015_of_match[] = {
-	{
-		.compatible = "ti,ads1015",
-		.data = (void *)ads1015
-	},
-	{
-		.compatible = "ti,ads1115",
-		.data = (void *)ads1115
-	},
-	{ },
-};
-MODULE_DEVICE_TABLE(of, ads1015_of_match);
-
-static struct i2c_driver ads1015_driver = {
-	.driver = {
-		.name = "ads1015",
-		.of_match_table = of_match_ptr(ads1015_of_match),
-	},
-	.probe = ads1015_probe,
-	.remove = ads1015_remove,
-	.id_table = ads1015_id,
-};
-
-module_i2c_driver(ads1015_driver);
-
-MODULE_AUTHOR("Dirk Eibach <eibach@gdsys.de>");
-MODULE_DESCRIPTION("ADS1015 driver");
-MODULE_LICENSE("GPL");
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index f96a7702b020..47d073006a13 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -958,7 +958,7 @@ config TI_ADC161S626
 
 config TI_ADS1015
 	tristate "Texas Instruments ADS1015 ADC"
-	depends on I2C && !SENSORS_ADS1015
+	depends on I2C
 	select REGMAP_I2C
 	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
-- 
2.7.4

             reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-01 18:12 Guenter Roeck [this message]
2019-07-14 16:16 ` Jonathan Cameron
2019-07-22 22:39 ` Rob Herring
2019-07-23  0:07   ` Guenter Roeck

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