git.oblomov.eu Git - linux-2.6/blob - drivers/usb/misc/cy7c63.c

   1 /*
   2 * cy7c63.c
   3 *
   4 * Copyright (c) 2006 Oliver Bock (bock@fh-wolfenbuettel.de)
   5 *
   6 *       This driver is based on the Cypress Thermometer USB Driver by
   7 *       Marcus Maul and the 2.0 version of Greg Kroah-Hartman's
   8 *       USB Skeleton driver.
   9 *
  10 *       Is is a generic driver for the Cypress CY7C63000 family.
  11 *       For the time being it enables you to toggle the single I/O ports
  12 *       of the device.
  13 *
  14 *       Supported vendors:      AK Modul-Bus Computer GmbH
  15 *       Supported devices:      CY7C63001A-PC (to be continued...)
  16 *       Supported functions:    Read/Write Ports (to be continued...)
  17 *
  18 *       Chipsets families:      CY7C63000, CY7C63001, CY7C63100, CY7C63101
  19 *
  20 *
  21 *       This program is free software; you can redistribute it and/or
  22 *       modify it under the terms of the GNU General Public License as
  23 *       published by the Free Software Foundation, version 2.
  24 */
  25
  26 #include <linux/init.h>
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/usb.h>
  30
  31 #define DRIVER_AUTHOR           "Oliver Bock (bock@fh-wolfenbuettel.de)"
  32 #define DRIVER_DESC             "Cypress CY7C63xxx USB driver"
  33
  34 #define CY7C63_VENDOR_ID        0xa2c
  35 #define CY7C63_PRODUCT_ID       0x8
  36
  37 #define CY7C63_READ_PORT        0x4
  38 #define CY7C63_WRITE_PORT       0x5
  39 #define CY7C63_READ_RAM         0x2
  40 #define CY7C63_WRITE_RAM        0x3
  41 #define CY7C63_READ_ROM         0x1
  42
  43 #define CY7C63_READ_PORT_ID0    0
  44 #define CY7C63_WRITE_PORT_ID0   0
  45 #define CY7C63_READ_PORT_ID1    0x2
  46 #define CY7C63_WRITE_PORT_ID1   1
  47
  48 #define CY7C63_MAX_REQSIZE      8
  49
  50
  51 /* table of devices that work with this driver */
  52 static struct usb_device_id cy7c63_table [] = {
  53         { USB_DEVICE(CY7C63_VENDOR_ID, CY7C63_PRODUCT_ID) },
  54         { }
  55 };
  56 MODULE_DEVICE_TABLE(usb, cy7c63_table);
  57
  58 /* structure to hold all of our device specific stuff */
  59 struct cy7c63 {
  60         struct usb_device *     udev;
  61         char                    port0;
  62         char                    port1;
  63 };
  64
  65 /* used to send usb control messages to device */
  66 int vendor_command(struct cy7c63 *dev, unsigned char request,
  67                          unsigned char address, unsigned char data) {
  68
  69         int retval = 0;
  70         unsigned int pipe;
  71         unsigned char *iobuf;
  72
  73         /* allocate some memory for the i/o buffer*/
  74         iobuf = kzalloc(CY7C63_MAX_REQSIZE, GFP_KERNEL);
  75         if (!iobuf) {
  76                 dev_err(&dev->udev->dev, "Out of memory!\n");
  77                 retval = -ENOMEM;
  78                 goto error;
  79         }
  80
  81         dev_dbg(&dev->udev->dev, "Sending usb_control_msg (data: %d)\n", data);
  82
  83         /* prepare usb control message and send it upstream */
  84         pipe = usb_rcvctrlpipe(dev->udev, 0);
  85         retval = usb_control_msg(dev->udev, pipe, request,
  86                                 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
  87                                 address, data, iobuf, CY7C63_MAX_REQSIZE,
  88                                 USB_CTRL_GET_TIMEOUT);
  89
  90         /* store returned data (more READs to be added!) */
  91         switch (request) {
  92                 case CY7C63_READ_PORT:
  93                         if (address == CY7C63_READ_PORT_ID0) {
  94                                 dev->port0 = iobuf[1];
  95                                 dev_dbg(&dev->udev->dev,
  96                                         "READ_PORT0 returned: %d\n",dev->port0);
  97                         }
  98                         else if (address == CY7C63_READ_PORT_ID1) {
  99                                 dev->port1 = iobuf[1];
 100                                 dev_dbg(&dev->udev->dev,
 101                                         "READ_PORT1 returned: %d\n",dev->port1);
 102                         }
 103                         break;
 104         }
 105
 106         kfree(iobuf);
 107 error:
 108         return retval;
 109 }
 110
 111 #define get_set_port(num,read_id,write_id) \
 112 static ssize_t set_port##num(struct device *dev, struct device_attribute *attr, \
 113                                         const char *buf, size_t count) {        \
 114                                                                                 \
 115         int value;                                                              \
 116         int result = 0;                                                         \
 117                                                                                 \
 118         struct usb_interface *intf = to_usb_interface(dev);                     \
 119         struct cy7c63 *cyp = usb_get_intfdata(intf);                            \
 120                                                                                 \
 121         dev_dbg(&cyp->udev->dev, "WRITE_PORT%d called\n", num);                 \
 122                                                                                 \
 123         /* validate input data */                                               \
 124         if (sscanf(buf, "%d", &value) < 1) {                                    \
 125                 result = -EINVAL;                                               \
 126                 goto error;                                                     \
 127         }                                                                       \
 128         if (value>255 || value<0) {                                             \
 129                 result = -EINVAL;                                               \
 130                 goto error;                                                     \
 131         }                                                                       \
 132                                                                                 \
 133         result = vendor_command(cyp, CY7C63_WRITE_PORT, write_id,               \
 134                                          (unsigned char)value);                 \
 135                                                                                 \
 136         dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n",result);    \
 137 error:                                                                          \
 138         return result < 0 ? result : count;                                     \
 139 }                                                                               \
 140                                                                                 \
 141 static ssize_t get_port##num(struct device *dev,                                \
 142                                  struct device_attribute *attr, char *buf) {    \
 143                                                                                 \
 144         int result = 0;                                                         \
 145                                                                                 \
 146         struct usb_interface *intf = to_usb_interface(dev);                     \
 147         struct cy7c63 *cyp = usb_get_intfdata(intf);                            \
 148                                                                                 \
 149         dev_dbg(&cyp->udev->dev, "READ_PORT%d called\n", num);                  \
 150                                                                                 \
 151         result = vendor_command(cyp, CY7C63_READ_PORT, read_id, 0);             \
 152                                                                                 \
 153         dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result);   \
 154                                                                                 \
 155         return sprintf(buf, "%d", cyp->port##num);                              \
 156 }                                                                               \
 157 static DEVICE_ATTR(port##num, S_IWUGO | S_IRUGO, get_port##num, set_port##num);
 158
 159 get_set_port(0, CY7C63_READ_PORT_ID0, CY7C63_WRITE_PORT_ID0);
 160 get_set_port(1, CY7C63_READ_PORT_ID1, CY7C63_WRITE_PORT_ID1);
 161
 162 static int cy7c63_probe(struct usb_interface *interface,
 163                         const struct usb_device_id *id) {
 164
 165         struct cy7c63 *dev = NULL;
 166         int retval = -ENOMEM;
 167
 168         /* allocate memory for our device state and initialize it */
 169         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 170         if (dev == NULL) {
 171                 dev_err(&dev->udev->dev, "Out of memory!\n");
 172                 goto error;
 173         }
 174
 175         dev->udev = usb_get_dev(interface_to_usbdev(interface));
 176
 177         /* save our data pointer in this interface device */
 178         usb_set_intfdata(interface, dev);
 179
 180         /* create device attribute files */
 181         device_create_file(&interface->dev, &dev_attr_port0);
 182         device_create_file(&interface->dev, &dev_attr_port1);
 183
 184         /* let the user know what node this device is now attached to */
 185         dev_info(&interface->dev,
 186                 "Cypress CY7C63xxx device now attached\n");
 187
 188         retval = 0;
 189 error:
 190         return retval;
 191 }
 192
 193 static void cy7c63_disconnect(struct usb_interface *interface) {
 194
 195         struct cy7c63 *dev;
 196
 197         dev = usb_get_intfdata(interface);
 198         usb_set_intfdata(interface, NULL);
 199
 200         /* remove device attribute files */
 201         device_remove_file(&interface->dev, &dev_attr_port0);
 202         device_remove_file(&interface->dev, &dev_attr_port1);
 203
 204         usb_put_dev(dev->udev);
 205
 206         dev_info(&interface->dev,
 207                 "Cypress CY7C63xxx device now disconnected\n");
 208
 209         kfree(dev);
 210 }
 211
 212 static struct usb_driver cy7c63_driver = {
 213         .name = "cy7c63",
 214         .probe = cy7c63_probe,
 215         .disconnect = cy7c63_disconnect,
 216         .id_table = cy7c63_table,
 217 };
 218
 219 static int __init cy7c63_init(void) {
 220
 221         int result;
 222
 223         /* register this driver with the USB subsystem */
 224         result = usb_register(&cy7c63_driver);
 225         if (result) {
 226                 err("Function usb_register failed! Error number: %d\n", result);
 227         }
 228
 229         return result;
 230 }
 231
 232 static void __exit cy7c63_exit(void) {
 233
 234         /* deregister this driver with the USB subsystem */
 235         usb_deregister(&cy7c63_driver);
 236 }
 237
 238 module_init(cy7c63_init);
 239 module_exit(cy7c63_exit);
 240
 241 MODULE_AUTHOR(DRIVER_AUTHOR);
 242 MODULE_DESCRIPTION(DRIVER_DESC);
 243
 244 MODULE_LICENSE("GPL");