]>
Commit | Line | Data |
---|---|---|
5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0 |
9189bfc2 OB |
2 | /* |
3 | * cypress_cy7c63.c | |
4 | * | |
d09d6a35 | 5 | * Copyright (c) 2006-2007 Oliver Bock (bock@tfh-berlin.de) |
9189bfc2 OB |
6 | * |
7 | * This driver is based on the Cypress USB Driver by Marcus Maul | |
8 | * (cyport) and the 2.0 version of Greg Kroah-Hartman's | |
9 | * USB Skeleton driver. | |
10 | * | |
11 | * This is a generic driver for the Cypress CY7C63xxx family. | |
12 | * For the time being it enables you to read from and write to | |
13 | * the single I/O ports of the device. | |
14 | * | |
15 | * Supported vendors: AK Modul-Bus Computer GmbH | |
6ad576bb OB |
16 | * (Firmware "Port-Chip") |
17 | * | |
18 | * Supported devices: CY7C63001A-PC | |
19 | * CY7C63001C-PXC | |
20 | * CY7C63001C-SXC | |
21 | * | |
22 | * Supported functions: Read/Write Ports | |
9189bfc2 OB |
23 | * |
24 | * | |
d09d6a35 OB |
25 | * For up-to-date information please visit: |
26 | * http://www.obock.de/kernel/cypress | |
9189bfc2 OB |
27 | */ |
28 | ||
9189bfc2 OB |
29 | #include <linux/module.h> |
30 | #include <linux/kernel.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
9189bfc2 OB |
32 | #include <linux/usb.h> |
33 | ||
d09d6a35 | 34 | #define DRIVER_AUTHOR "Oliver Bock (bock@tfh-berlin.de)" |
9189bfc2 OB |
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 */ | |
33b9e162 | 56 | static const struct usb_device_id cypress_table[] = { |
9189bfc2 OB |
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) { | |
9189bfc2 OB |
79 | retval = -ENOMEM; |
80 | goto error; | |
81 | } | |
82 | ||
83 | dev_dbg(&dev->udev->dev, "Sending usb_control_msg (data: %d)\n", data); | |
84 | ||
85 | /* prepare usb control message and send it upstream */ | |
86 | pipe = usb_rcvctrlpipe(dev->udev, 0); | |
87 | retval = usb_control_msg(dev->udev, pipe, request, | |
88 | USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER, | |
89 | address, data, iobuf, CYPRESS_MAX_REQSIZE, | |
90 | USB_CTRL_GET_TIMEOUT); | |
91 | ||
92 | /* store returned data (more READs to be added) */ | |
93 | switch (request) { | |
94 | case CYPRESS_READ_PORT: | |
95 | if (address == CYPRESS_READ_PORT_ID0) { | |
96 | dev->port[0] = iobuf[1]; | |
97 | dev_dbg(&dev->udev->dev, | |
98 | "READ_PORT0 returned: %d\n", | |
99 | dev->port[0]); | |
100 | } | |
101 | else if (address == CYPRESS_READ_PORT_ID1) { | |
102 | dev->port[1] = iobuf[1]; | |
103 | dev_dbg(&dev->udev->dev, | |
104 | "READ_PORT1 returned: %d\n", | |
105 | dev->port[1]); | |
106 | } | |
107 | break; | |
108 | } | |
109 | ||
110 | kfree(iobuf); | |
111 | error: | |
112 | return retval; | |
113 | } | |
114 | ||
115 | /* write port value */ | |
116 | static ssize_t write_port(struct device *dev, struct device_attribute *attr, | |
117 | const char *buf, size_t count, | |
118 | int port_num, int write_id) | |
119 | { | |
120 | int value = -1; | |
121 | int result = 0; | |
122 | ||
123 | struct usb_interface *intf = to_usb_interface(dev); | |
124 | struct cypress *cyp = usb_get_intfdata(intf); | |
125 | ||
126 | dev_dbg(&cyp->udev->dev, "WRITE_PORT%d called\n", port_num); | |
127 | ||
128 | /* validate input data */ | |
129 | if (sscanf(buf, "%d", &value) < 1) { | |
130 | result = -EINVAL; | |
131 | goto error; | |
132 | } | |
133 | if (value < 0 || value > 255) { | |
134 | result = -EINVAL; | |
135 | goto error; | |
136 | } | |
137 | ||
138 | result = vendor_command(cyp, CYPRESS_WRITE_PORT, write_id, | |
139 | (unsigned char)value); | |
140 | ||
141 | dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result); | |
142 | error: | |
143 | return result < 0 ? result : count; | |
144 | } | |
145 | ||
146 | /* attribute callback handler (write) */ | |
ed5bd7a4 | 147 | static ssize_t port0_store(struct device *dev, |
9189bfc2 OB |
148 | struct device_attribute *attr, |
149 | const char *buf, size_t count) | |
150 | { | |
151 | return write_port(dev, attr, buf, count, 0, CYPRESS_WRITE_PORT_ID0); | |
152 | } | |
153 | ||
154 | /* attribute callback handler (write) */ | |
ed5bd7a4 | 155 | static ssize_t port1_store(struct device *dev, |
9189bfc2 OB |
156 | struct device_attribute *attr, |
157 | const char *buf, size_t count) | |
158 | { | |
159 | return write_port(dev, attr, buf, count, 1, CYPRESS_WRITE_PORT_ID1); | |
160 | } | |
161 | ||
162 | /* read port value */ | |
163 | static ssize_t read_port(struct device *dev, struct device_attribute *attr, | |
164 | char *buf, int port_num, int read_id) | |
165 | { | |
166 | int result = 0; | |
167 | ||
168 | struct usb_interface *intf = to_usb_interface(dev); | |
169 | struct cypress *cyp = usb_get_intfdata(intf); | |
170 | ||
171 | dev_dbg(&cyp->udev->dev, "READ_PORT%d called\n", port_num); | |
172 | ||
173 | result = vendor_command(cyp, CYPRESS_READ_PORT, read_id, 0); | |
174 | ||
175 | dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result); | |
176 | ||
177 | return sprintf(buf, "%d", cyp->port[port_num]); | |
178 | } | |
179 | ||
180 | /* attribute callback handler (read) */ | |
ed5bd7a4 | 181 | static ssize_t port0_show(struct device *dev, |
9189bfc2 OB |
182 | struct device_attribute *attr, char *buf) |
183 | { | |
184 | return read_port(dev, attr, buf, 0, CYPRESS_READ_PORT_ID0); | |
185 | } | |
761ef1e4 | 186 | static DEVICE_ATTR_RW(port0); |
9189bfc2 OB |
187 | |
188 | /* attribute callback handler (read) */ | |
ed5bd7a4 | 189 | static ssize_t port1_show(struct device *dev, |
9189bfc2 OB |
190 | struct device_attribute *attr, char *buf) |
191 | { | |
192 | return read_port(dev, attr, buf, 1, CYPRESS_READ_PORT_ID1); | |
193 | } | |
ed5bd7a4 | 194 | static DEVICE_ATTR_RW(port1); |
9189bfc2 | 195 | |
761ef1e4 GKH |
196 | static struct attribute *cypress_attrs[] = { |
197 | &dev_attr_port0.attr, | |
198 | &dev_attr_port1.attr, | |
199 | NULL, | |
200 | }; | |
201 | ATTRIBUTE_GROUPS(cypress); | |
9189bfc2 OB |
202 | |
203 | static int cypress_probe(struct usb_interface *interface, | |
204 | const struct usb_device_id *id) | |
205 | { | |
206 | struct cypress *dev = NULL; | |
207 | int retval = -ENOMEM; | |
208 | ||
209 | /* allocate memory for our device state and initialize it */ | |
210 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
e83c06e9 | 211 | if (!dev) |
4d42e1bb | 212 | goto error_mem; |
9189bfc2 OB |
213 | |
214 | dev->udev = usb_get_dev(interface_to_usbdev(interface)); | |
215 | ||
216 | /* save our data pointer in this interface device */ | |
217 | usb_set_intfdata(interface, dev); | |
218 | ||
9189bfc2 OB |
219 | /* let the user know that the device is now attached */ |
220 | dev_info(&interface->dev, | |
221 | "Cypress CY7C63xxx device now attached\n"); | |
4d42e1bb | 222 | return 0; |
9189bfc2 | 223 | |
4d42e1bb | 224 | error_mem: |
9189bfc2 OB |
225 | return retval; |
226 | } | |
227 | ||
228 | static void cypress_disconnect(struct usb_interface *interface) | |
229 | { | |
230 | struct cypress *dev; | |
231 | ||
232 | dev = usb_get_intfdata(interface); | |
9189bfc2 | 233 | |
949ce471 ON |
234 | /* the intfdata can be set to NULL only after the |
235 | * device files have been removed */ | |
236 | usb_set_intfdata(interface, NULL); | |
9189bfc2 OB |
237 | |
238 | usb_put_dev(dev->udev); | |
239 | ||
240 | dev_info(&interface->dev, | |
241 | "Cypress CY7C63xxx device now disconnected\n"); | |
242 | ||
243 | kfree(dev); | |
244 | } | |
245 | ||
246 | static struct usb_driver cypress_driver = { | |
247 | .name = "cypress_cy7c63", | |
248 | .probe = cypress_probe, | |
249 | .disconnect = cypress_disconnect, | |
250 | .id_table = cypress_table, | |
761ef1e4 | 251 | .dev_groups = cypress_groups, |
9189bfc2 OB |
252 | }; |
253 | ||
65db4305 | 254 | module_usb_driver(cypress_driver); |
9189bfc2 OB |
255 | |
256 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
257 | MODULE_DESCRIPTION(DRIVER_DESC); | |
258 | ||
259 | MODULE_LICENSE("GPL"); |