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9189bfc2 OB |
1 | /* |
2 | * cypress_cy7c63.c | |
3 | * | |
4 | * Copyright (c) 2006 Oliver Bock (o.bock@fh-wolfenbuettel.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 | |
6ad576bb OB |
15 | * (Firmware "Port-Chip") |
16 | * | |
17 | * Supported devices: CY7C63001A-PC | |
18 | * CY7C63001C-PXC | |
19 | * CY7C63001C-SXC | |
20 | * | |
21 | * Supported functions: Read/Write Ports | |
9189bfc2 OB |
22 | * |
23 | * | |
24 | * This program is free software; you can redistribute it and/or | |
25 | * modify it under the terms of the GNU General Public License as | |
26 | * published by the Free Software Foundation, version 2. | |
27 | */ | |
28 | ||
29 | #include <linux/init.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/kernel.h> | |
32 | #include <linux/usb.h> | |
33 | ||
34 | #define DRIVER_AUTHOR "Oliver Bock (o.bock@fh-wolfenbuettel.de)" | |
35 | #define DRIVER_DESC "Cypress CY7C63xxx USB driver" | |
36 | ||
37 | #define CYPRESS_VENDOR_ID 0xa2c | |
38 | #define CYPRESS_PRODUCT_ID 0x8 | |
39 | ||
40 | #define CYPRESS_READ_PORT 0x4 | |
41 | #define CYPRESS_WRITE_PORT 0x5 | |
42 | ||
43 | #define CYPRESS_READ_RAM 0x2 | |
44 | #define CYPRESS_WRITE_RAM 0x3 | |
45 | #define CYPRESS_READ_ROM 0x1 | |
46 | ||
47 | #define CYPRESS_READ_PORT_ID0 0 | |
48 | #define CYPRESS_WRITE_PORT_ID0 0 | |
49 | #define CYPRESS_READ_PORT_ID1 0x2 | |
50 | #define CYPRESS_WRITE_PORT_ID1 1 | |
51 | ||
52 | #define CYPRESS_MAX_REQSIZE 8 | |
53 | ||
54 | ||
55 | /* table of devices that work with this driver */ | |
56 | static struct usb_device_id cypress_table [] = { | |
57 | { USB_DEVICE(CYPRESS_VENDOR_ID, CYPRESS_PRODUCT_ID) }, | |
58 | { } | |
59 | }; | |
60 | MODULE_DEVICE_TABLE(usb, cypress_table); | |
61 | ||
62 | /* structure to hold all of our device specific stuff */ | |
63 | struct cypress { | |
64 | struct usb_device * udev; | |
65 | unsigned char port[2]; | |
66 | }; | |
67 | ||
68 | /* used to send usb control messages to device */ | |
69 | static int vendor_command(struct cypress *dev, unsigned char request, | |
70 | unsigned char address, unsigned char data) | |
71 | { | |
72 | int retval = 0; | |
73 | unsigned int pipe; | |
74 | unsigned char *iobuf; | |
75 | ||
76 | /* allocate some memory for the i/o buffer*/ | |
77 | iobuf = kzalloc(CYPRESS_MAX_REQSIZE, GFP_KERNEL); | |
78 | if (!iobuf) { | |
79 | dev_err(&dev->udev->dev, "Out of memory!\n"); | |
80 | retval = -ENOMEM; | |
81 | goto error; | |
82 | } | |
83 | ||
84 | dev_dbg(&dev->udev->dev, "Sending usb_control_msg (data: %d)\n", data); | |
85 | ||
86 | /* prepare usb control message and send it upstream */ | |
87 | pipe = usb_rcvctrlpipe(dev->udev, 0); | |
88 | retval = usb_control_msg(dev->udev, pipe, request, | |
89 | USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER, | |
90 | address, data, iobuf, CYPRESS_MAX_REQSIZE, | |
91 | USB_CTRL_GET_TIMEOUT); | |
92 | ||
93 | /* store returned data (more READs to be added) */ | |
94 | switch (request) { | |
95 | case CYPRESS_READ_PORT: | |
96 | if (address == CYPRESS_READ_PORT_ID0) { | |
97 | dev->port[0] = iobuf[1]; | |
98 | dev_dbg(&dev->udev->dev, | |
99 | "READ_PORT0 returned: %d\n", | |
100 | dev->port[0]); | |
101 | } | |
102 | else if (address == CYPRESS_READ_PORT_ID1) { | |
103 | dev->port[1] = iobuf[1]; | |
104 | dev_dbg(&dev->udev->dev, | |
105 | "READ_PORT1 returned: %d\n", | |
106 | dev->port[1]); | |
107 | } | |
108 | break; | |
109 | } | |
110 | ||
111 | kfree(iobuf); | |
112 | error: | |
113 | return retval; | |
114 | } | |
115 | ||
116 | /* write port value */ | |
117 | static ssize_t write_port(struct device *dev, struct device_attribute *attr, | |
118 | const char *buf, size_t count, | |
119 | int port_num, int write_id) | |
120 | { | |
121 | int value = -1; | |
122 | int result = 0; | |
123 | ||
124 | struct usb_interface *intf = to_usb_interface(dev); | |
125 | struct cypress *cyp = usb_get_intfdata(intf); | |
126 | ||
127 | dev_dbg(&cyp->udev->dev, "WRITE_PORT%d called\n", port_num); | |
128 | ||
129 | /* validate input data */ | |
130 | if (sscanf(buf, "%d", &value) < 1) { | |
131 | result = -EINVAL; | |
132 | goto error; | |
133 | } | |
134 | if (value < 0 || value > 255) { | |
135 | result = -EINVAL; | |
136 | goto error; | |
137 | } | |
138 | ||
139 | result = vendor_command(cyp, CYPRESS_WRITE_PORT, write_id, | |
140 | (unsigned char)value); | |
141 | ||
142 | dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result); | |
143 | error: | |
144 | return result < 0 ? result : count; | |
145 | } | |
146 | ||
147 | /* attribute callback handler (write) */ | |
148 | static ssize_t set_port0_handler(struct device *dev, | |
149 | struct device_attribute *attr, | |
150 | const char *buf, size_t count) | |
151 | { | |
152 | return write_port(dev, attr, buf, count, 0, CYPRESS_WRITE_PORT_ID0); | |
153 | } | |
154 | ||
155 | /* attribute callback handler (write) */ | |
156 | static ssize_t set_port1_handler(struct device *dev, | |
157 | struct device_attribute *attr, | |
158 | const char *buf, size_t count) | |
159 | { | |
160 | return write_port(dev, attr, buf, count, 1, CYPRESS_WRITE_PORT_ID1); | |
161 | } | |
162 | ||
163 | /* read port value */ | |
164 | static ssize_t read_port(struct device *dev, struct device_attribute *attr, | |
165 | char *buf, int port_num, int read_id) | |
166 | { | |
167 | int result = 0; | |
168 | ||
169 | struct usb_interface *intf = to_usb_interface(dev); | |
170 | struct cypress *cyp = usb_get_intfdata(intf); | |
171 | ||
172 | dev_dbg(&cyp->udev->dev, "READ_PORT%d called\n", port_num); | |
173 | ||
174 | result = vendor_command(cyp, CYPRESS_READ_PORT, read_id, 0); | |
175 | ||
176 | dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result); | |
177 | ||
178 | return sprintf(buf, "%d", cyp->port[port_num]); | |
179 | } | |
180 | ||
181 | /* attribute callback handler (read) */ | |
182 | static ssize_t get_port0_handler(struct device *dev, | |
183 | struct device_attribute *attr, char *buf) | |
184 | { | |
185 | return read_port(dev, attr, buf, 0, CYPRESS_READ_PORT_ID0); | |
186 | } | |
187 | ||
188 | /* attribute callback handler (read) */ | |
189 | static ssize_t get_port1_handler(struct device *dev, | |
190 | struct device_attribute *attr, char *buf) | |
191 | { | |
192 | return read_port(dev, attr, buf, 1, CYPRESS_READ_PORT_ID1); | |
193 | } | |
194 | ||
195 | static DEVICE_ATTR(port0, S_IWUGO | S_IRUGO, | |
196 | get_port0_handler, set_port0_handler); | |
197 | ||
198 | static DEVICE_ATTR(port1, S_IWUGO | S_IRUGO, | |
199 | get_port1_handler, set_port1_handler); | |
200 | ||
201 | ||
202 | static 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 == NULL) { | |
b93b58ee | 211 | dev_err(&interface->dev, "Out of memory!\n"); |
9189bfc2 OB |
212 | goto error; |
213 | } | |
214 | ||
215 | dev->udev = usb_get_dev(interface_to_usbdev(interface)); | |
216 | ||
217 | /* save our data pointer in this interface device */ | |
218 | usb_set_intfdata(interface, dev); | |
219 | ||
220 | /* create device attribute files */ | |
221 | device_create_file(&interface->dev, &dev_attr_port0); | |
222 | device_create_file(&interface->dev, &dev_attr_port1); | |
223 | ||
224 | /* let the user know that the device is now attached */ | |
225 | dev_info(&interface->dev, | |
226 | "Cypress CY7C63xxx device now attached\n"); | |
227 | ||
228 | retval = 0; | |
229 | error: | |
230 | return retval; | |
231 | } | |
232 | ||
233 | static void cypress_disconnect(struct usb_interface *interface) | |
234 | { | |
235 | struct cypress *dev; | |
236 | ||
237 | dev = usb_get_intfdata(interface); | |
238 | usb_set_intfdata(interface, NULL); | |
239 | ||
240 | /* remove device attribute files */ | |
241 | device_remove_file(&interface->dev, &dev_attr_port0); | |
242 | device_remove_file(&interface->dev, &dev_attr_port1); | |
243 | ||
244 | usb_put_dev(dev->udev); | |
245 | ||
246 | dev_info(&interface->dev, | |
247 | "Cypress CY7C63xxx device now disconnected\n"); | |
248 | ||
249 | kfree(dev); | |
250 | } | |
251 | ||
252 | static struct usb_driver cypress_driver = { | |
253 | .name = "cypress_cy7c63", | |
254 | .probe = cypress_probe, | |
255 | .disconnect = cypress_disconnect, | |
256 | .id_table = cypress_table, | |
257 | }; | |
258 | ||
259 | static int __init cypress_init(void) | |
260 | { | |
261 | int result; | |
262 | ||
263 | /* register this driver with the USB subsystem */ | |
264 | result = usb_register(&cypress_driver); | |
265 | if (result) { | |
266 | err("Function usb_register failed! Error number: %d\n", result); | |
267 | } | |
268 | ||
269 | return result; | |
270 | } | |
271 | ||
272 | static void __exit cypress_exit(void) | |
273 | { | |
274 | /* deregister this driver with the USB subsystem */ | |
275 | usb_deregister(&cypress_driver); | |
276 | } | |
277 | ||
278 | module_init(cypress_init); | |
279 | module_exit(cypress_exit); | |
280 | ||
281 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
282 | MODULE_DESCRIPTION(DRIVER_DESC); | |
283 | ||
284 | MODULE_LICENSE("GPL"); |