/*
* cy7c63.c
*
* Copyright (c) 2006 Oliver Bock (bock@fh-wolfenbuettel.de)
*
* This driver is based on the Cypress Thermometer USB Driver by
* Marcus Maul and the 2.0 version of Greg Kroah-Hartman's
* USB Skeleton driver.
*
* Is is a generic driver for the Cypress CY7C63000 family.
* For the time being it enables you to toggle the single I/O ports
* of the device.
*
* Supported vendors: AK Modul-Bus Computer GmbH
* Supported devices: CY7C63001A-PC (to be continued...)
* Supported functions: Read/Write Ports (to be continued...)
*
* Chipsets families: CY7C63000, CY7C63001, CY7C63100, CY7C63101
*
*
* 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.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/usb.h>
#define DRIVER_AUTHOR "Oliver Bock (bock@fh-wolfenbuettel.de)"
#define DRIVER_DESC "Cypress CY7C63xxx USB driver"
#define CY7C63_VENDOR_ID 0xa2c
#define CY7C63_PRODUCT_ID 0x8
#define CY7C63_READ_PORT 0x4
#define CY7C63_WRITE_PORT 0x5
#define CY7C63_READ_RAM 0x2
#define CY7C63_WRITE_RAM 0x3
#define CY7C63_READ_ROM 0x1
#define CY7C63_READ_PORT_ID0 0
#define CY7C63_WRITE_PORT_ID0 0
#define CY7C63_READ_PORT_ID1 0x2
#define CY7C63_WRITE_PORT_ID1 1
#define CY7C63_MAX_REQSIZE 8
/* table of devices that work with this driver */
static struct usb_device_id cy7c63_table [] = {
{ USB_DEVICE(CY7C63_VENDOR_ID, CY7C63_PRODUCT_ID) },
{ }
};
MODULE_DEVICE_TABLE(usb, cy7c63_table);
/* structure to hold all of our device specific stuff */
struct cy7c63 {
struct usb_device * udev;
char port0;
char port1;
};
/* used to send usb control messages to device */
int vendor_command(struct cy7c63 *dev, unsigned char request,
unsigned char address, unsigned char data) {
int retval = 0;
unsigned int pipe;
unsigned char *iobuf;
/* allocate some memory for the i/o buffer*/
iobuf = kzalloc(CY7C63_MAX_REQSIZE, GFP_KERNEL);
if (!iobuf) {
dev_err(&dev->udev->dev, "Out of memory!\n");
retval = -ENOMEM;
goto error;
}
dev_dbg(&dev->udev->dev, "Sending usb_control_msg (data: %d)\n", data);
/* prepare usb control message and send it upstream */
pipe = usb_rcvctrlpipe(dev->udev, 0);
retval = usb_control_msg(dev->udev, pipe, request,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
address, data, iobuf, CY7C63_MAX_REQSIZE,
USB_CTRL_GET_TIMEOUT);
/* store returned data (more READs to be added!) */
switch (request) {
case CY7C63_READ_PORT:
if (address == CY7C63_READ_PORT_ID0) {
dev->port0 = iobuf[1];
dev_dbg(&dev->udev->dev,
"READ_PORT0 returned: %d\n",dev->port0);
}
else if (address == CY7C63_READ_PORT_ID1) {
dev->port1 = iobuf[1];
dev_dbg(&dev->udev->dev,
"READ_PORT1 returned: %d\n",dev->port1);
}
break;
}
kfree(iobuf);
error:
return retval;
}
#define get_set_port(num,read_id,write_id) \
static ssize_t set_port##num(struct device *dev, struct device_attribute *attr, \
const char *buf, size_t count) { \
\
int value; \
int result = 0; \
\
struct usb_interface *intf = to_usb_interface(dev); \
struct cy7c63 *cyp = usb_get_intfdata(intf); \
\
dev_dbg(&cyp->udev->dev, "WRITE_PORT%d called\n", num); \
\
/* validate input data */ \
if (sscanf(buf, "%d", &value) < 1) { \
result = -EINVAL; \
goto error; \
} \
if (value>255 || value<0) { \
result = -EINVAL; \
goto error; \
} \
\
result = vendor_command(cyp, CY7C63_WRITE_PORT, write_id, \
(unsigned char)value); \
\
dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n",result); \
error: \
return result < 0 ? result : count; \
} \
\
static ssize_t get_port##num(struct device *dev, \
struct device_attribute *attr, char *buf) { \
\
int result = 0; \
\
struct usb_interface *intf = to_usb_interface(dev); \
struct cy7c63 *cyp = usb_get_intfdata(intf); \
\
dev_dbg(&cyp->udev->dev, "READ_PORT%d called\n", num); \
\
result = vendor_command(cyp, CY7C63_READ_PORT, read_id, 0); \
\
dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result); \
\
return sprintf(buf, "%d", cyp->port##num); \
} \
static DEVICE_ATTR(port##num, S_IWUGO | S_IRUGO, get_port##num, set_port##num);
get_set_port(0, CY7C63_READ_PORT_ID0, CY7C63_WRITE_PORT_ID0);
get_set_port(1, CY7C63_READ_PORT_ID1, CY7C63_WRITE_PORT_ID1);
static int cy7c63_probe(struct usb_interface *interface,
const struct usb_device_id *id) {
struct cy7c63 *dev = NULL;
int retval = -ENOMEM;
/* allocate memory for our device state and initialize it */
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL) {
dev_err(&dev->udev->dev, "Out of memory!\n");
goto error;
}
dev->udev = usb_get_dev(interface_to_usbdev(interface));
/* save our data pointer in this interface device */
usb_set_intfdata(interface, dev);
/* create device attribute files */
device_create_file(&interface->dev, &dev_attr_port0);
device_create_file(&interface->dev, &dev_attr_port1);
/* let the user know what node this device is now attached to */
dev_info(&interface->dev,
"Cypress CY7C63xxx device now attached\n");
retval = 0;
error:
return retval;
}
static void cy7c63_disconnect(struct usb_interface *interface) {
struct cy7c63 *dev;
dev = usb_get_intfdata(interface);
usb_set_intfdata(interface, NULL);
/* remove device attribute files */
device_remove_file(&interface->dev, &dev_attr_port0);
device_remove_file(&interface->dev, &dev_attr_port1);
usb_put_dev(dev->udev);
dev_info(&interface->dev,
"Cypress CY7C63xxx device now disconnected\n");
kfree(dev);
}
static struct usb_driver cy7c63_driver = {
.name = "cy7c63",
.probe = cy7c63_probe,
.disconnect = cy7c63_disconnect,
.id_table = cy7c63_table,
};
static int __init cy7c63_init(void) {
int result;
/* register this driver with the USB subsystem */
result = usb_register(&cy7c63_driver);
if (result) {
err("Function usb_register failed! Error number: %d\n", result);
}
return result;
}
static void __exit cy7c63_exit(void) {
/* deregister this driver with the USB subsystem */
usb_deregister(&cy7c63_driver);
}
module_init(cy7c63_init);
module_exit(cy7c63_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
