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1/*
2* cypress_cy7c63.c
3*
4* Copyright (c) 2006-2007 Oliver Bock (bock@tfh-berlin.de)
5*
6* This driver is based on the Cypress USB Driver by Marcus Maul
7* (cyport) and the 2.0 version of Greg Kroah-Hartman's
8* USB Skeleton driver.
9*
10* This is a generic driver for the Cypress CY7C63xxx family.
11* For the time being it enables you to read from and write to
12* the single I/O ports of the device.
13*
14* Supported vendors: AK Modul-Bus Computer GmbH
15* (Firmware "Port-Chip")
16*
17* Supported devices: CY7C63001A-PC
18* CY7C63001C-PXC
19* CY7C63001C-SXC
20*
21* Supported functions: Read/Write Ports
22*
23*
24* For up-to-date information please visit:
25* http://www.obock.de/kernel/cypress
26*
27* This program is free software; you can redistribute it and/or
28* modify it under the terms of the GNU General Public License as
29* published by the Free Software Foundation, version 2.
30*/
31
32#include <linux/init.h>
33#include <linux/module.h>
34#include <linux/kernel.h>
35#include <linux/slab.h>
36#include <linux/usb.h>
37
38#define DRIVER_AUTHOR "Oliver Bock (bock@tfh-berlin.de)"
39#define DRIVER_DESC "Cypress CY7C63xxx USB driver"
40
41#define CYPRESS_VENDOR_ID 0xa2c
42#define CYPRESS_PRODUCT_ID 0x8
43
44#define CYPRESS_READ_PORT 0x4
45#define CYPRESS_WRITE_PORT 0x5
46
47#define CYPRESS_READ_RAM 0x2
48#define CYPRESS_WRITE_RAM 0x3
49#define CYPRESS_READ_ROM 0x1
50
51#define CYPRESS_READ_PORT_ID0 0
52#define CYPRESS_WRITE_PORT_ID0 0
53#define CYPRESS_READ_PORT_ID1 0x2
54#define CYPRESS_WRITE_PORT_ID1 1
55
56#define CYPRESS_MAX_REQSIZE 8
57
58
59/* table of devices that work with this driver */
60static const struct usb_device_id cypress_table[] = {
61 { USB_DEVICE(CYPRESS_VENDOR_ID, CYPRESS_PRODUCT_ID) },
62 { }
63};
64MODULE_DEVICE_TABLE(usb, cypress_table);
65
66/* structure to hold all of our device specific stuff */
67struct cypress {
68 struct usb_device * udev;
69 unsigned char port[2];
70};
71
72/* used to send usb control messages to device */
73static int vendor_command(struct cypress *dev, unsigned char request,
74 unsigned char address, unsigned char data)
75{
76 int retval = 0;
77 unsigned int pipe;
78 unsigned char *iobuf;
79
80 /* allocate some memory for the i/o buffer*/
81 iobuf = kzalloc(CYPRESS_MAX_REQSIZE, GFP_KERNEL);
82 if (!iobuf) {
83 dev_err(&dev->udev->dev, "Out of memory!\n");
84 retval = -ENOMEM;
85 goto error;
86 }
87
88 dev_dbg(&dev->udev->dev, "Sending usb_control_msg (data: %d)\n", data);
89
90 /* prepare usb control message and send it upstream */
91 pipe = usb_rcvctrlpipe(dev->udev, 0);
92 retval = usb_control_msg(dev->udev, pipe, request,
93 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
94 address, data, iobuf, CYPRESS_MAX_REQSIZE,
95 USB_CTRL_GET_TIMEOUT);
96
97 /* store returned data (more READs to be added) */
98 switch (request) {
99 case CYPRESS_READ_PORT:
100 if (address == CYPRESS_READ_PORT_ID0) {
101 dev->port[0] = iobuf[1];
102 dev_dbg(&dev->udev->dev,
103 "READ_PORT0 returned: %d\n",
104 dev->port[0]);
105 }
106 else if (address == CYPRESS_READ_PORT_ID1) {
107 dev->port[1] = iobuf[1];
108 dev_dbg(&dev->udev->dev,
109 "READ_PORT1 returned: %d\n",
110 dev->port[1]);
111 }
112 break;
113 }
114
115 kfree(iobuf);
116error:
117 return retval;
118}
119
120/* write port value */
121static ssize_t write_port(struct device *dev, struct device_attribute *attr,
122 const char *buf, size_t count,
123 int port_num, int write_id)
124{
125 int value = -1;
126 int result = 0;
127
128 struct usb_interface *intf = to_usb_interface(dev);
129 struct cypress *cyp = usb_get_intfdata(intf);
130
131 dev_dbg(&cyp->udev->dev, "WRITE_PORT%d called\n", port_num);
132
133 /* validate input data */
134 if (sscanf(buf, "%d", &value) < 1) {
135 result = -EINVAL;
136 goto error;
137 }
138 if (value < 0 || value > 255) {
139 result = -EINVAL;
140 goto error;
141 }
142
143 result = vendor_command(cyp, CYPRESS_WRITE_PORT, write_id,
144 (unsigned char)value);
145
146 dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result);
147error:
148 return result < 0 ? result : count;
149}
150
151/* attribute callback handler (write) */
152static ssize_t set_port0_handler(struct device *dev,
153 struct device_attribute *attr,
154 const char *buf, size_t count)
155{
156 return write_port(dev, attr, buf, count, 0, CYPRESS_WRITE_PORT_ID0);
157}
158
159/* attribute callback handler (write) */
160static ssize_t set_port1_handler(struct device *dev,
161 struct device_attribute *attr,
162 const char *buf, size_t count)
163{
164 return write_port(dev, attr, buf, count, 1, CYPRESS_WRITE_PORT_ID1);
165}
166
167/* read port value */
168static ssize_t read_port(struct device *dev, struct device_attribute *attr,
169 char *buf, int port_num, int read_id)
170{
171 int result = 0;
172
173 struct usb_interface *intf = to_usb_interface(dev);
174 struct cypress *cyp = usb_get_intfdata(intf);
175
176 dev_dbg(&cyp->udev->dev, "READ_PORT%d called\n", port_num);
177
178 result = vendor_command(cyp, CYPRESS_READ_PORT, read_id, 0);
179
180 dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result);
181
182 return sprintf(buf, "%d", cyp->port[port_num]);
183}
184
185/* attribute callback handler (read) */
186static ssize_t get_port0_handler(struct device *dev,
187 struct device_attribute *attr, char *buf)
188{
189 return read_port(dev, attr, buf, 0, CYPRESS_READ_PORT_ID0);
190}
191
192/* attribute callback handler (read) */
193static ssize_t get_port1_handler(struct device *dev,
194 struct device_attribute *attr, char *buf)
195{
196 return read_port(dev, attr, buf, 1, CYPRESS_READ_PORT_ID1);
197}
198
199static DEVICE_ATTR(port0, S_IRUGO | S_IWUSR, get_port0_handler, set_port0_handler);
200
201static DEVICE_ATTR(port1, S_IRUGO | S_IWUSR, get_port1_handler, set_port1_handler);
202
203
204static int cypress_probe(struct usb_interface *interface,
205 const struct usb_device_id *id)
206{
207 struct cypress *dev = NULL;
208 int retval = -ENOMEM;
209
210 /* allocate memory for our device state and initialize it */
211 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
212 if (dev == NULL) {
213 dev_err(&interface->dev, "Out of memory!\n");
214 goto error_mem;
215 }
216
217 dev->udev = usb_get_dev(interface_to_usbdev(interface));
218
219 /* save our data pointer in this interface device */
220 usb_set_intfdata(interface, dev);
221
222 /* create device attribute files */
223 retval = device_create_file(&interface->dev, &dev_attr_port0);
224 if (retval)
225 goto error;
226 retval = device_create_file(&interface->dev, &dev_attr_port1);
227 if (retval)
228 goto error;
229
230 /* let the user know that the device is now attached */
231 dev_info(&interface->dev,
232 "Cypress CY7C63xxx device now attached\n");
233 return 0;
234
235error:
236 device_remove_file(&interface->dev, &dev_attr_port0);
237 device_remove_file(&interface->dev, &dev_attr_port1);
238 usb_set_intfdata(interface, NULL);
239 usb_put_dev(dev->udev);
240 kfree(dev);
241
242error_mem:
243 return retval;
244}
245
246static void cypress_disconnect(struct usb_interface *interface)
247{
248 struct cypress *dev;
249
250 dev = usb_get_intfdata(interface);
251
252 /* remove device attribute files */
253 device_remove_file(&interface->dev, &dev_attr_port0);
254 device_remove_file(&interface->dev, &dev_attr_port1);
255 /* the intfdata can be set to NULL only after the
256 * device files have been removed */
257 usb_set_intfdata(interface, NULL);
258
259 usb_put_dev(dev->udev);
260
261 dev_info(&interface->dev,
262 "Cypress CY7C63xxx device now disconnected\n");
263
264 kfree(dev);
265}
266
267static struct usb_driver cypress_driver = {
268 .name = "cypress_cy7c63",
269 .probe = cypress_probe,
270 .disconnect = cypress_disconnect,
271 .id_table = cypress_table,
272};
273
274static int __init cypress_init(void)
275{
276 int result;
277
278 /* register this driver with the USB subsystem */
279 result = usb_register(&cypress_driver);
280 if (result)
281 printk(KERN_ERR KBUILD_MODNAME ": usb_register failed! "
282 "Error number: %d\n", result);
283
284 return result;
285}
286
287static void __exit cypress_exit(void)
288{
289 /* deregister this driver with the USB subsystem */
290 usb_deregister(&cypress_driver);
291}
292
293module_init(cypress_init);
294module_exit(cypress_exit);
295
296MODULE_AUTHOR(DRIVER_AUTHOR);
297MODULE_DESCRIPTION(DRIVER_DESC);
298
299MODULE_LICENSE("GPL");
1/*
2* cypress_cy7c63.c
3*
4* Copyright (c) 2006-2007 Oliver Bock (bock@tfh-berlin.de)
5*
6* This driver is based on the Cypress USB Driver by Marcus Maul
7* (cyport) and the 2.0 version of Greg Kroah-Hartman's
8* USB Skeleton driver.
9*
10* This is a generic driver for the Cypress CY7C63xxx family.
11* For the time being it enables you to read from and write to
12* the single I/O ports of the device.
13*
14* Supported vendors: AK Modul-Bus Computer GmbH
15* (Firmware "Port-Chip")
16*
17* Supported devices: CY7C63001A-PC
18* CY7C63001C-PXC
19* CY7C63001C-SXC
20*
21* Supported functions: Read/Write Ports
22*
23*
24* For up-to-date information please visit:
25* http://www.obock.de/kernel/cypress
26*
27* This program is free software; you can redistribute it and/or
28* modify it under the terms of the GNU General Public License as
29* published by the Free Software Foundation, version 2.
30*/
31
32#include <linux/module.h>
33#include <linux/kernel.h>
34#include <linux/slab.h>
35#include <linux/usb.h>
36
37#define DRIVER_AUTHOR "Oliver Bock (bock@tfh-berlin.de)"
38#define DRIVER_DESC "Cypress CY7C63xxx USB driver"
39
40#define CYPRESS_VENDOR_ID 0xa2c
41#define CYPRESS_PRODUCT_ID 0x8
42
43#define CYPRESS_READ_PORT 0x4
44#define CYPRESS_WRITE_PORT 0x5
45
46#define CYPRESS_READ_RAM 0x2
47#define CYPRESS_WRITE_RAM 0x3
48#define CYPRESS_READ_ROM 0x1
49
50#define CYPRESS_READ_PORT_ID0 0
51#define CYPRESS_WRITE_PORT_ID0 0
52#define CYPRESS_READ_PORT_ID1 0x2
53#define CYPRESS_WRITE_PORT_ID1 1
54
55#define CYPRESS_MAX_REQSIZE 8
56
57
58/* table of devices that work with this driver */
59static const struct usb_device_id cypress_table[] = {
60 { USB_DEVICE(CYPRESS_VENDOR_ID, CYPRESS_PRODUCT_ID) },
61 { }
62};
63MODULE_DEVICE_TABLE(usb, cypress_table);
64
65/* structure to hold all of our device specific stuff */
66struct cypress {
67 struct usb_device * udev;
68 unsigned char port[2];
69};
70
71/* used to send usb control messages to device */
72static int vendor_command(struct cypress *dev, unsigned char request,
73 unsigned char address, unsigned char data)
74{
75 int retval = 0;
76 unsigned int pipe;
77 unsigned char *iobuf;
78
79 /* allocate some memory for the i/o buffer*/
80 iobuf = kzalloc(CYPRESS_MAX_REQSIZE, GFP_KERNEL);
81 if (!iobuf) {
82 retval = -ENOMEM;
83 goto error;
84 }
85
86 dev_dbg(&dev->udev->dev, "Sending usb_control_msg (data: %d)\n", data);
87
88 /* prepare usb control message and send it upstream */
89 pipe = usb_rcvctrlpipe(dev->udev, 0);
90 retval = usb_control_msg(dev->udev, pipe, request,
91 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
92 address, data, iobuf, CYPRESS_MAX_REQSIZE,
93 USB_CTRL_GET_TIMEOUT);
94
95 /* store returned data (more READs to be added) */
96 switch (request) {
97 case CYPRESS_READ_PORT:
98 if (address == CYPRESS_READ_PORT_ID0) {
99 dev->port[0] = iobuf[1];
100 dev_dbg(&dev->udev->dev,
101 "READ_PORT0 returned: %d\n",
102 dev->port[0]);
103 }
104 else if (address == CYPRESS_READ_PORT_ID1) {
105 dev->port[1] = iobuf[1];
106 dev_dbg(&dev->udev->dev,
107 "READ_PORT1 returned: %d\n",
108 dev->port[1]);
109 }
110 break;
111 }
112
113 kfree(iobuf);
114error:
115 return retval;
116}
117
118/* write port value */
119static ssize_t write_port(struct device *dev, struct device_attribute *attr,
120 const char *buf, size_t count,
121 int port_num, int write_id)
122{
123 int value = -1;
124 int result = 0;
125
126 struct usb_interface *intf = to_usb_interface(dev);
127 struct cypress *cyp = usb_get_intfdata(intf);
128
129 dev_dbg(&cyp->udev->dev, "WRITE_PORT%d called\n", port_num);
130
131 /* validate input data */
132 if (sscanf(buf, "%d", &value) < 1) {
133 result = -EINVAL;
134 goto error;
135 }
136 if (value < 0 || value > 255) {
137 result = -EINVAL;
138 goto error;
139 }
140
141 result = vendor_command(cyp, CYPRESS_WRITE_PORT, write_id,
142 (unsigned char)value);
143
144 dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result);
145error:
146 return result < 0 ? result : count;
147}
148
149/* attribute callback handler (write) */
150static ssize_t set_port0_handler(struct device *dev,
151 struct device_attribute *attr,
152 const char *buf, size_t count)
153{
154 return write_port(dev, attr, buf, count, 0, CYPRESS_WRITE_PORT_ID0);
155}
156
157/* attribute callback handler (write) */
158static ssize_t set_port1_handler(struct device *dev,
159 struct device_attribute *attr,
160 const char *buf, size_t count)
161{
162 return write_port(dev, attr, buf, count, 1, CYPRESS_WRITE_PORT_ID1);
163}
164
165/* read port value */
166static ssize_t read_port(struct device *dev, struct device_attribute *attr,
167 char *buf, int port_num, int read_id)
168{
169 int result = 0;
170
171 struct usb_interface *intf = to_usb_interface(dev);
172 struct cypress *cyp = usb_get_intfdata(intf);
173
174 dev_dbg(&cyp->udev->dev, "READ_PORT%d called\n", port_num);
175
176 result = vendor_command(cyp, CYPRESS_READ_PORT, read_id, 0);
177
178 dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result);
179
180 return sprintf(buf, "%d", cyp->port[port_num]);
181}
182
183/* attribute callback handler (read) */
184static ssize_t get_port0_handler(struct device *dev,
185 struct device_attribute *attr, char *buf)
186{
187 return read_port(dev, attr, buf, 0, CYPRESS_READ_PORT_ID0);
188}
189
190/* attribute callback handler (read) */
191static ssize_t get_port1_handler(struct device *dev,
192 struct device_attribute *attr, char *buf)
193{
194 return read_port(dev, attr, buf, 1, CYPRESS_READ_PORT_ID1);
195}
196
197static DEVICE_ATTR(port0, S_IRUGO | S_IWUSR, get_port0_handler, set_port0_handler);
198
199static DEVICE_ATTR(port1, S_IRUGO | S_IWUSR, get_port1_handler, set_port1_handler);
200
201
202static int cypress_probe(struct usb_interface *interface,
203 const struct usb_device_id *id)
204{
205 struct cypress *dev = NULL;
206 int retval = -ENOMEM;
207
208 /* allocate memory for our device state and initialize it */
209 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
210 if (!dev)
211 goto error_mem;
212
213 dev->udev = usb_get_dev(interface_to_usbdev(interface));
214
215 /* save our data pointer in this interface device */
216 usb_set_intfdata(interface, dev);
217
218 /* create device attribute files */
219 retval = device_create_file(&interface->dev, &dev_attr_port0);
220 if (retval)
221 goto error;
222 retval = device_create_file(&interface->dev, &dev_attr_port1);
223 if (retval)
224 goto error;
225
226 /* let the user know that the device is now attached */
227 dev_info(&interface->dev,
228 "Cypress CY7C63xxx device now attached\n");
229 return 0;
230
231error:
232 device_remove_file(&interface->dev, &dev_attr_port0);
233 device_remove_file(&interface->dev, &dev_attr_port1);
234 usb_set_intfdata(interface, NULL);
235 usb_put_dev(dev->udev);
236 kfree(dev);
237
238error_mem:
239 return retval;
240}
241
242static void cypress_disconnect(struct usb_interface *interface)
243{
244 struct cypress *dev;
245
246 dev = usb_get_intfdata(interface);
247
248 /* remove device attribute files */
249 device_remove_file(&interface->dev, &dev_attr_port0);
250 device_remove_file(&interface->dev, &dev_attr_port1);
251 /* the intfdata can be set to NULL only after the
252 * device files have been removed */
253 usb_set_intfdata(interface, NULL);
254
255 usb_put_dev(dev->udev);
256
257 dev_info(&interface->dev,
258 "Cypress CY7C63xxx device now disconnected\n");
259
260 kfree(dev);
261}
262
263static struct usb_driver cypress_driver = {
264 .name = "cypress_cy7c63",
265 .probe = cypress_probe,
266 .disconnect = cypress_disconnect,
267 .id_table = cypress_table,
268};
269
270module_usb_driver(cypress_driver);
271
272MODULE_AUTHOR(DRIVER_AUTHOR);
273MODULE_DESCRIPTION(DRIVER_DESC);
274
275MODULE_LICENSE("GPL");