+++ /dev/null
-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
-
+++ /dev/null
-/*
- 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);
-
git.openpandora.org / pandora-kernel.git / commitdiff