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Linux/drivers/usb/misc/cypress_cy7c63.c

  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 */
 59 static const struct usb_device_id cypress_table[] = {
 60         { USB_DEVICE(CYPRESS_VENDOR_ID, CYPRESS_PRODUCT_ID) },
 61         { }
 62 };
 63 MODULE_DEVICE_TABLE(usb, cypress_table);
 64 
 65 /* structure to hold all of our device specific stuff */
 66 struct cypress {
 67         struct usb_device *     udev;
 68         unsigned char           port[2];
 69 };
 70 
 71 /* used to send usb control messages to device */
 72 static 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                 dev_err(&dev->udev->dev, "Out of memory!\n");
 83                 retval = -ENOMEM;
 84                 goto error;
 85         }
 86 
 87         dev_dbg(&dev->udev->dev, "Sending usb_control_msg (data: %d)\n", data);
 88 
 89         /* prepare usb control message and send it upstream */
 90         pipe = usb_rcvctrlpipe(dev->udev, 0);
 91         retval = usb_control_msg(dev->udev, pipe, request,
 92                                  USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
 93                                  address, data, iobuf, CYPRESS_MAX_REQSIZE,
 94                                  USB_CTRL_GET_TIMEOUT);
 95 
 96         /* store returned data (more READs to be added) */
 97         switch (request) {
 98                 case CYPRESS_READ_PORT:
 99                         if (address == CYPRESS_READ_PORT_ID0) {
100                                 dev->port[0] = iobuf[1];
101                                 dev_dbg(&dev->udev->dev,
102                                         "READ_PORT0 returned: %d\n",
103                                         dev->port[0]);
104                         }
105                         else if (address == CYPRESS_READ_PORT_ID1) {
106                                 dev->port[1] = iobuf[1];
107                                 dev_dbg(&dev->udev->dev,
108                                         "READ_PORT1 returned: %d\n",
109                                         dev->port[1]);
110                         }
111                         break;
112         }
113 
114         kfree(iobuf);
115 error:
116         return retval;
117 }
118 
119 /* write port value */
120 static ssize_t write_port(struct device *dev, struct device_attribute *attr,
121                           const char *buf, size_t count,
122                           int port_num, int write_id)
123 {
124         int value = -1;
125         int result = 0;
126 
127         struct usb_interface *intf = to_usb_interface(dev);
128         struct cypress *cyp = usb_get_intfdata(intf);
129 
130         dev_dbg(&cyp->udev->dev, "WRITE_PORT%d called\n", port_num);
131 
132         /* validate input data */
133         if (sscanf(buf, "%d", &value) < 1) {
134                 result = -EINVAL;
135                 goto error;
136         }
137         if (value < 0 || value > 255) {
138                 result = -EINVAL;
139                 goto error;
140         }
141 
142         result = vendor_command(cyp, CYPRESS_WRITE_PORT, write_id,
143                                 (unsigned char)value);
144 
145         dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result);
146 error:
147         return result < 0 ? result : count;
148 }
149 
150 /* attribute callback handler (write) */
151 static ssize_t set_port0_handler(struct device *dev,
152                                  struct device_attribute *attr,
153                                  const char *buf, size_t count)
154 {
155         return write_port(dev, attr, buf, count, 0, CYPRESS_WRITE_PORT_ID0);
156 }
157 
158 /* attribute callback handler (write) */
159 static ssize_t set_port1_handler(struct device *dev,
160                                  struct device_attribute *attr,
161                                  const char *buf, size_t count)
162 {
163         return write_port(dev, attr, buf, count, 1, CYPRESS_WRITE_PORT_ID1);
164 }
165 
166 /* read port value */
167 static ssize_t read_port(struct device *dev, struct device_attribute *attr,
168                          char *buf, int port_num, int read_id)
169 {
170         int result = 0;
171 
172         struct usb_interface *intf = to_usb_interface(dev);
173         struct cypress *cyp = usb_get_intfdata(intf);
174 
175         dev_dbg(&cyp->udev->dev, "READ_PORT%d called\n", port_num);
176 
177         result = vendor_command(cyp, CYPRESS_READ_PORT, read_id, 0);
178 
179         dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result);
180 
181         return sprintf(buf, "%d", cyp->port[port_num]);
182 }
183 
184 /* attribute callback handler (read) */
185 static ssize_t get_port0_handler(struct device *dev,
186                                  struct device_attribute *attr, char *buf)
187 {
188         return read_port(dev, attr, buf, 0, CYPRESS_READ_PORT_ID0);
189 }
190 
191 /* attribute callback handler (read) */
192 static ssize_t get_port1_handler(struct device *dev,
193                                  struct device_attribute *attr, char *buf)
194 {
195         return read_port(dev, attr, buf, 1, CYPRESS_READ_PORT_ID1);
196 }
197 
198 static DEVICE_ATTR(port0, S_IRUGO | S_IWUSR, get_port0_handler, set_port0_handler);
199 
200 static DEVICE_ATTR(port1, S_IRUGO | S_IWUSR, get_port1_handler, set_port1_handler);
201 
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);
211         if (dev == NULL) {
212                 dev_err(&interface->dev, "Out of memory!\n");
213                 goto error_mem;
214         }
215 
216         dev->udev = usb_get_dev(interface_to_usbdev(interface));
217 
218         /* save our data pointer in this interface device */
219         usb_set_intfdata(interface, dev);
220 
221         /* create device attribute files */
222         retval = device_create_file(&interface->dev, &dev_attr_port0);
223         if (retval)
224                 goto error;
225         retval = device_create_file(&interface->dev, &dev_attr_port1);
226         if (retval)
227                 goto error;
228 
229         /* let the user know that the device is now attached */
230         dev_info(&interface->dev,
231                  "Cypress CY7C63xxx device now attached\n");
232         return 0;
233 
234 error:
235         device_remove_file(&interface->dev, &dev_attr_port0);
236         device_remove_file(&interface->dev, &dev_attr_port1);
237         usb_set_intfdata(interface, NULL);
238         usb_put_dev(dev->udev);
239         kfree(dev);
240 
241 error_mem:
242         return retval;
243 }
244 
245 static void cypress_disconnect(struct usb_interface *interface)
246 {
247         struct cypress *dev;
248 
249         dev = usb_get_intfdata(interface);
250 
251         /* remove device attribute files */
252         device_remove_file(&interface->dev, &dev_attr_port0);
253         device_remove_file(&interface->dev, &dev_attr_port1);
254         /* the intfdata can be set to NULL only after the
255          * device files have been removed */
256         usb_set_intfdata(interface, NULL);
257 
258         usb_put_dev(dev->udev);
259 
260         dev_info(&interface->dev,
261                  "Cypress CY7C63xxx device now disconnected\n");
262 
263         kfree(dev);
264 }
265 
266 static struct usb_driver cypress_driver = {
267         .name = "cypress_cy7c63",
268         .probe = cypress_probe,
269         .disconnect = cypress_disconnect,
270         .id_table = cypress_table,
271 };
272 
273 module_usb_driver(cypress_driver);
274 
275 MODULE_AUTHOR(DRIVER_AUTHOR);
276 MODULE_DESCRIPTION(DRIVER_DESC);
277 
278 MODULE_LICENSE("GPL");
279 

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