2005-06-07 09:55:38 -04:00
|
|
|
/*
|
|
|
|
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 */
|
|
|
|
static unsigned short normal_i2c[] = {0x74, 0x75, 0x76, 0x77, I2C_CLIENT_END};
|
|
|
|
|
|
|
|
/* Insmod parameters */
|
2005-07-31 15:49:03 -04:00
|
|
|
I2C_CLIENT_INSMOD_1(pca9539);
|
2005-06-07 09:55:38 -04:00
|
|
|
|
|
|
|
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,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int pca9539_attach_adapter(struct i2c_adapter *adapter);
|
|
|
|
static int pca9539_detect(struct i2c_adapter *adapter, int address, int kind);
|
|
|
|
static int pca9539_detach_client(struct i2c_client *client);
|
|
|
|
|
|
|
|
/* This is the driver that will be inserted */
|
|
|
|
static struct i2c_driver pca9539_driver = {
|
2005-11-26 14:36:00 -05:00
|
|
|
.driver = {
|
|
|
|
.name = "pca9539",
|
|
|
|
},
|
2005-06-07 09:55:38 -04:00
|
|
|
.attach_adapter = pca9539_attach_adapter,
|
|
|
|
.detach_client = pca9539_detach_client,
|
|
|
|
};
|
|
|
|
|
|
|
|
struct pca9539_data {
|
|
|
|
struct i2c_client client;
|
|
|
|
};
|
|
|
|
|
|
|
|
/* 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,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int pca9539_attach_adapter(struct i2c_adapter *adapter)
|
|
|
|
{
|
2005-07-31 15:42:02 -04:00
|
|
|
return i2c_probe(adapter, &addr_data, pca9539_detect);
|
2005-06-07 09:55:38 -04:00
|
|
|
}
|
|
|
|
|
2005-07-31 15:42:02 -04:00
|
|
|
/* This function is called by i2c_probe */
|
2005-06-07 09:55:38 -04:00
|
|
|
static int pca9539_detect(struct i2c_adapter *adapter, int address, int kind)
|
|
|
|
{
|
|
|
|
struct i2c_client *new_client;
|
|
|
|
struct pca9539_data *data;
|
|
|
|
int err = 0;
|
|
|
|
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
|
|
|
goto exit;
|
|
|
|
|
|
|
|
/* OK. For now, we presume we have a valid client. We now create the
|
|
|
|
client structure, even though we cannot fill it completely yet. */
|
2005-10-17 17:09:43 -04:00
|
|
|
if (!(data = kzalloc(sizeof(struct pca9539_data), GFP_KERNEL))) {
|
2005-06-07 09:55:38 -04:00
|
|
|
err = -ENOMEM;
|
|
|
|
goto exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
new_client = &data->client;
|
|
|
|
i2c_set_clientdata(new_client, data);
|
|
|
|
new_client->addr = address;
|
|
|
|
new_client->adapter = adapter;
|
|
|
|
new_client->driver = &pca9539_driver;
|
|
|
|
new_client->flags = 0;
|
|
|
|
|
2006-07-01 11:22:18 -04:00
|
|
|
if (kind < 0) {
|
|
|
|
/* Detection: the pca9539 only has 8 registers (0-7).
|
|
|
|
A read of 7 should succeed, but a read of 8 should fail. */
|
|
|
|
if ((i2c_smbus_read_byte_data(new_client, 7) < 0) ||
|
|
|
|
(i2c_smbus_read_byte_data(new_client, 8) >= 0))
|
|
|
|
goto exit_kfree;
|
|
|
|
}
|
2005-06-07 09:55:38 -04:00
|
|
|
|
|
|
|
strlcpy(new_client->name, "pca9539", I2C_NAME_SIZE);
|
|
|
|
|
|
|
|
/* Tell the I2C layer a new client has arrived */
|
|
|
|
if ((err = i2c_attach_client(new_client)))
|
|
|
|
goto exit_kfree;
|
|
|
|
|
|
|
|
/* Register sysfs hooks (don't care about failure) */
|
|
|
|
sysfs_create_group(&new_client->dev.kobj, &pca9539_defattr_group);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
exit_kfree:
|
|
|
|
kfree(data);
|
|
|
|
exit:
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pca9539_detach_client(struct i2c_client *client)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
2005-07-27 16:14:49 -04:00
|
|
|
if ((err = i2c_detach_client(client)))
|
2005-06-07 09:55:38 -04:00
|
|
|
return err;
|
|
|
|
|
|
|
|
kfree(i2c_get_clientdata(client));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
|
|
|
|