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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                 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);
114 error:
115         return retval;
116 }
117 
118 /* write port value */
119 static 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);
145 error:
146         return result < 0 ? result : count;
147 }
148 
149 /* attribute callback handler (write) */
150 static 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) */
158 static 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 */
166 static 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) */
184 static 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) */
191 static 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 
197 static DEVICE_ATTR(port0, S_IRUGO | S_IWUSR, get_port0_handler, set_port0_handler);
198 
199 static DEVICE_ATTR(port1, S_IRUGO | S_IWUSR, 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)
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 
231 error:
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 
238 error_mem:
239         return retval;
240 }
241 
242 static 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 
263 static struct usb_driver cypress_driver = {
264         .name = "cypress_cy7c63",
265         .probe = cypress_probe,
266         .disconnect = cypress_disconnect,
267         .id_table = cypress_table,
268 };
269 
270 module_usb_driver(cypress_driver);
271 
272 MODULE_AUTHOR(DRIVER_AUTHOR);
273 MODULE_DESCRIPTION(DRIVER_DESC);
274 
275 MODULE_LICENSE("GPL");
276 

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