4 * Copyright (c) 2006 Oliver Bock (bock@fh-wolfenbuettel.de)
6 * This driver is based on the Cypress Thermometer USB Driver by
7 * Marcus Maul and the 2.0 version of Greg Kroah-Hartman's
10 * Is is a generic driver for the Cypress CY7C63000 family.
11 * For the time being it enables you to toggle the single I/O ports
14 * Supported vendors: AK Modul-Bus Computer GmbH
15 * Supported devices: CY7C63001A-PC (to be continued...)
16 * Supported functions: Read/Write Ports (to be continued...)
18 * Chipsets families: CY7C63000, CY7C63001, CY7C63100, CY7C63101
21 * This program is free software; you can redistribute it and/or
22 * modify it under the terms of the GNU General Public License as
23 * published by the Free Software Foundation, version 2.
26 #include <linux/init.h>
27 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/usb.h>
31 #define DRIVER_AUTHOR "Oliver Bock (bock@fh-wolfenbuettel.de)"
32 #define DRIVER_DESC "Cypress CY7C63xxx USB driver"
34 #define CY7C63_VENDOR_ID 0xa2c
35 #define CY7C63_PRODUCT_ID 0x8
37 #define CY7C63_READ_PORT 0x4
38 #define CY7C63_WRITE_PORT 0x5
39 #define CY7C63_READ_RAM 0x2
40 #define CY7C63_WRITE_RAM 0x3
41 #define CY7C63_READ_ROM 0x1
43 #define CY7C63_READ_PORT_ID0 0
44 #define CY7C63_WRITE_PORT_ID0 0
45 #define CY7C63_READ_PORT_ID1 0x2
46 #define CY7C63_WRITE_PORT_ID1 1
48 #define CY7C63_MAX_REQSIZE 8
51 /* table of devices that work with this driver */
52 static struct usb_device_id cy7c63_table [] = {
53 { USB_DEVICE(CY7C63_VENDOR_ID, CY7C63_PRODUCT_ID) },
56 MODULE_DEVICE_TABLE(usb, cy7c63_table);
58 /* structure to hold all of our device specific stuff */
60 struct usb_device * udev;
65 /* used to send usb control messages to device */
66 int vendor_command(struct cy7c63 *dev, unsigned char request,
67 unsigned char address, unsigned char data) {
73 /* allocate some memory for the i/o buffer*/
74 iobuf = kzalloc(CY7C63_MAX_REQSIZE, GFP_KERNEL);
76 dev_err(&dev->udev->dev, "Out of memory!\n");
81 dev_dbg(&dev->udev->dev, "Sending usb_control_msg (data: %d)\n", data);
83 /* prepare usb control message and send it upstream */
84 pipe = usb_rcvctrlpipe(dev->udev, 0);
85 retval = usb_control_msg(dev->udev, pipe, request,
86 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
87 address, data, iobuf, CY7C63_MAX_REQSIZE,
88 USB_CTRL_GET_TIMEOUT);
90 /* store returned data (more READs to be added!) */
92 case CY7C63_READ_PORT:
93 if (address == CY7C63_READ_PORT_ID0) {
94 dev->port0 = iobuf[1];
95 dev_dbg(&dev->udev->dev,
96 "READ_PORT0 returned: %d\n",dev->port0);
98 else if (address == CY7C63_READ_PORT_ID1) {
99 dev->port1 = iobuf[1];
100 dev_dbg(&dev->udev->dev,
101 "READ_PORT1 returned: %d\n",dev->port1);
111 #define get_set_port(num,read_id,write_id) \
112 static ssize_t set_port##num(struct device *dev, struct device_attribute *attr, \
113 const char *buf, size_t count) { \
118 struct usb_interface *intf = to_usb_interface(dev); \
119 struct cy7c63 *cyp = usb_get_intfdata(intf); \
121 dev_dbg(&cyp->udev->dev, "WRITE_PORT%d called\n", num); \
123 /* validate input data */ \
124 if (sscanf(buf, "%d", &value) < 1) { \
128 if (value>255 || value<0) { \
133 result = vendor_command(cyp, CY7C63_WRITE_PORT, write_id, \
134 (unsigned char)value); \
136 dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n",result); \
138 return result < 0 ? result : count; \
141 static ssize_t get_port##num(struct device *dev, \
142 struct device_attribute *attr, char *buf) { \
146 struct usb_interface *intf = to_usb_interface(dev); \
147 struct cy7c63 *cyp = usb_get_intfdata(intf); \
149 dev_dbg(&cyp->udev->dev, "READ_PORT%d called\n", num); \
151 result = vendor_command(cyp, CY7C63_READ_PORT, read_id, 0); \
153 dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result); \
155 return sprintf(buf, "%d", cyp->port##num); \
157 static DEVICE_ATTR(port##num, S_IWUGO | S_IRUGO, get_port##num, set_port##num);
159 get_set_port(0, CY7C63_READ_PORT_ID0, CY7C63_WRITE_PORT_ID0);
160 get_set_port(1, CY7C63_READ_PORT_ID1, CY7C63_WRITE_PORT_ID1);
162 static int cy7c63_probe(struct usb_interface *interface,
163 const struct usb_device_id *id) {
165 struct cy7c63 *dev = NULL;
166 int retval = -ENOMEM;
168 /* allocate memory for our device state and initialize it */
169 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
171 dev_err(&dev->udev->dev, "Out of memory!\n");
175 dev->udev = usb_get_dev(interface_to_usbdev(interface));
177 /* save our data pointer in this interface device */
178 usb_set_intfdata(interface, dev);
180 /* create device attribute files */
181 device_create_file(&interface->dev, &dev_attr_port0);
182 device_create_file(&interface->dev, &dev_attr_port1);
184 /* let the user know what node this device is now attached to */
185 dev_info(&interface->dev,
186 "Cypress CY7C63xxx device now attached\n");
193 static void cy7c63_disconnect(struct usb_interface *interface) {
197 dev = usb_get_intfdata(interface);
198 usb_set_intfdata(interface, NULL);
200 /* remove device attribute files */
201 device_remove_file(&interface->dev, &dev_attr_port0);
202 device_remove_file(&interface->dev, &dev_attr_port1);
204 usb_put_dev(dev->udev);
206 dev_info(&interface->dev,
207 "Cypress CY7C63xxx device now disconnected\n");
212 static struct usb_driver cy7c63_driver = {
214 .probe = cy7c63_probe,
215 .disconnect = cy7c63_disconnect,
216 .id_table = cy7c63_table,
219 static int __init cy7c63_init(void) {
223 /* register this driver with the USB subsystem */
224 result = usb_register(&cy7c63_driver);
226 err("Function usb_register failed! Error number: %d\n", result);
232 static void __exit cy7c63_exit(void) {
234 /* deregister this driver with the USB subsystem */
235 usb_deregister(&cy7c63_driver);
238 module_init(cy7c63_init);
239 module_exit(cy7c63_exit);
241 MODULE_AUTHOR(DRIVER_AUTHOR);
242 MODULE_DESCRIPTION(DRIVER_DESC);
244 MODULE_LICENSE("GPL");