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Commit 732d4811 authored by Wolfram Sang's avatar Wolfram Sang Committed by Jean Delvare
Browse files

i2c/chips: Remove deprecated pca9539 driver 



The pca9539 driver in drivers/i2c/chips which just exports its registers to
sysfs is superseded by drivers/gpio/pca953x.c which properly uses the gpiolib.
As this driver has been deprecated for more than a year, finally remove it.

Signed-off-by: default avatarWolfram Sang <w.sang@pengutronix.de>
Acked-by: default avatarBen Gardner <gardner.ben@gmail.com>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent 8f67eeb0

Documentation/i2c/chips/pca9539

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Kernel driver pca9539

=====================



NOTE: this driver is deprecated and will be dropped soon, use

drivers/gpio/pca9539.c instead.



Supported chips:

  * Philips PCA9539

    Prefix: 'pca9539'

    Addresses scanned: none

    Datasheet:

        http://www.semiconductors.philips.com/acrobat/datasheets/PCA9539_2.pdf



Author: Ben Gardner <bgardner@wabtec.com>





Description

-----------



The Philips PCA9539 is a 16 bit low power I/O device.

All 16 lines can be individually configured as an input or output.

The input sense can also be inverted.

The 16 lines are split between two bytes.





Detection

---------



The PCA9539 is difficult to detect and not commonly found in PC machines,

so you have to pass the I2C bus and address of the installed PCA9539

devices explicitly to the driver at load time via the force=... parameter.





Sysfs entries

-------------



Each is a byte that maps to the 8 I/O bits.

A '0' suffix is for bits 0-7, while '1' is for bits 8-15.



input[01]     - read the current value

output[01]    - sets the output value

direction[01] - direction of each bit: 1=input, 0=output

invert[01]    - toggle the input bit sense



input reads the actual state of the line and is always available.

The direction defaults to input for all channels.





General Remarks

---------------



Note that each output, direction, and invert entry controls 8 lines.

You should use the read, modify, write sequence.

For example. to set output bit 0 of 1.

  val=$(cat output0)

  val=$(( $val | 1 ))

  echo $val > output0

drivers/i2c/chips/Kconfig

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@@ -33,19 +33,6 @@ config SENSORS_PCF8574 
	  These devices are hard to detect and rarely found on mainstream

	  hardware.  If unsure, say N.



config SENSORS_PCA9539

	tristate "Philips PCA9539 16-bit I/O port (DEPRECATED)"

	depends on EXPERIMENTAL && GPIO_PCA953X = "n"

	help

	  If you say yes here you get support for the Philips PCA9539

	  16-bit I/O port.



	  This driver can also be built as a module.  If so, the module

	  will be called pca9539.



	  This driver is deprecated and will be dropped soon. Use

	  drivers/gpio/pca953x.c instead.



config SENSORS_TSL2550

	tristate "Taos TSL2550 ambient light sensor"

	depends on EXPERIMENTAL

drivers/i2c/chips/Makefile

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@@ -11,7 +11,6 @@ 
#



obj-$(CONFIG_DS1682)		+= ds1682.o

obj-$(CONFIG_SENSORS_PCA9539)	+= pca9539.o

obj-$(CONFIG_SENSORS_PCF8574)	+= pcf8574.o

obj-$(CONFIG_SENSORS_TSL2550)	+= tsl2550.o

drivers/i2c/chips/pca9539.c

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/*

    pca9539.c - 16-bit I/O port with interrupt and reset



    Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>



    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; version 2 of the License.

*/



#include <linux/module.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/i2c.h>

#include <linux/hwmon-sysfs.h>



/* Addresses to scan: none, device is not autodetected */

static const unsigned short normal_i2c[] = { I2C_CLIENT_END };



/* Insmod parameters */

I2C_CLIENT_INSMOD_1(pca9539);



enum pca9539_cmd

{

	PCA9539_INPUT_0		= 0,

	PCA9539_INPUT_1		= 1,

	PCA9539_OUTPUT_0	= 2,

	PCA9539_OUTPUT_1	= 3,

	PCA9539_INVERT_0	= 4,

	PCA9539_INVERT_1	= 5,

	PCA9539_DIRECTION_0	= 6,

	PCA9539_DIRECTION_1	= 7,

};



/* following are the sysfs callback functions */

static ssize_t pca9539_show(struct device *dev, struct device_attribute *attr,

			    char *buf)

{

	struct sensor_device_attribute *psa = to_sensor_dev_attr(attr);

	struct i2c_client *client = to_i2c_client(dev);

	return sprintf(buf, "%d\n", i2c_smbus_read_byte_data(client,

							     psa->index));

}



static ssize_t pca9539_store(struct device *dev, struct device_attribute *attr,

			     const char *buf, size_t count)

{

	struct sensor_device_attribute *psa = to_sensor_dev_attr(attr);

	struct i2c_client *client = to_i2c_client(dev);

	unsigned long val = simple_strtoul(buf, NULL, 0);

	if (val > 0xff)

		return -EINVAL;

	i2c_smbus_write_byte_data(client, psa->index, val);

	return count;

}



/* Define the device attributes */



#define PCA9539_ENTRY_RO(name, cmd_idx) \

	static SENSOR_DEVICE_ATTR(name, S_IRUGO, pca9539_show, NULL, cmd_idx)



#define PCA9539_ENTRY_RW(name, cmd_idx) \

	static SENSOR_DEVICE_ATTR(name, S_IRUGO | S_IWUSR, pca9539_show, \

				  pca9539_store, cmd_idx)



PCA9539_ENTRY_RO(input0, PCA9539_INPUT_0);

PCA9539_ENTRY_RO(input1, PCA9539_INPUT_1);

PCA9539_ENTRY_RW(output0, PCA9539_OUTPUT_0);

PCA9539_ENTRY_RW(output1, PCA9539_OUTPUT_1);

PCA9539_ENTRY_RW(invert0, PCA9539_INVERT_0);

PCA9539_ENTRY_RW(invert1, PCA9539_INVERT_1);

PCA9539_ENTRY_RW(direction0, PCA9539_DIRECTION_0);

PCA9539_ENTRY_RW(direction1, PCA9539_DIRECTION_1);



static struct attribute *pca9539_attributes[] = {

	&sensor_dev_attr_input0.dev_attr.attr,

	&sensor_dev_attr_input1.dev_attr.attr,

	&sensor_dev_attr_output0.dev_attr.attr,

	&sensor_dev_attr_output1.dev_attr.attr,

	&sensor_dev_attr_invert0.dev_attr.attr,

	&sensor_dev_attr_invert1.dev_attr.attr,

	&sensor_dev_attr_direction0.dev_attr.attr,

	&sensor_dev_attr_direction1.dev_attr.attr,

	NULL

};



static struct attribute_group pca9539_defattr_group = {

	.attrs = pca9539_attributes,

};



/* Return 0 if detection is successful, -ENODEV otherwise */

static int pca9539_detect(struct i2c_client *client, int kind,

			  struct i2c_board_info *info)

{

	struct i2c_adapter *adapter = client->adapter;



	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))

		return -ENODEV;



	strlcpy(info->type, "pca9539", I2C_NAME_SIZE);



	return 0;

}



static int pca9539_probe(struct i2c_client *client,

			 const struct i2c_device_id *id)

{

	/* Register sysfs hooks */

	return sysfs_create_group(&client->dev.kobj,

				  &pca9539_defattr_group);

}



static int pca9539_remove(struct i2c_client *client)

{

	sysfs_remove_group(&client->dev.kobj, &pca9539_defattr_group);

	return 0;

}



static const struct i2c_device_id pca9539_id[] = {

	{ "pca9539", 0 },

	{ }

};



static struct i2c_driver pca9539_driver = {

	.driver = {

		.name	= "pca9539",

	},

	.probe		= pca9539_probe,

	.remove		= pca9539_remove,

	.id_table	= pca9539_id,



	.detect		= pca9539_detect,

	.address_data	= &addr_data,

};



static int __init pca9539_init(void)

{

	return i2c_add_driver(&pca9539_driver);

}



static void __exit pca9539_exit(void)

{

	i2c_del_driver(&pca9539_driver);

}



MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>");

MODULE_DESCRIPTION("PCA9539 driver");

MODULE_LICENSE("GPL");



module_init(pca9539_init);

module_exit(pca9539_exit);