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 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 * 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) { 211 dev_err(&interface->dev, "Out of memory!\n"); 212 goto error_mem; 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 retval = device_create_file(&interface->dev, &dev_attr_port0); 222 if (retval) 223 goto error; 224 retval = device_create_file(&interface->dev, &dev_attr_port1); 225 if (retval) 226 goto error; 227 228 /* let the user know that the device is now attached */ 229 dev_info(&interface->dev, 230 "Cypress CY7C63xxx device now attached\n"); 231 return 0; 232 233 error: 234 device_remove_file(&interface->dev, &dev_attr_port0); 235 device_remove_file(&interface->dev, &dev_attr_port1); 236 usb_set_intfdata(interface, NULL); 237 usb_put_dev(dev->udev); 238 kfree(dev); 239 240 error_mem: 241 return retval; 242 } 243 244 static void cypress_disconnect(struct usb_interface *interface) 245 { 246 struct cypress *dev; 247 248 dev = usb_get_intfdata(interface); 249 250 /* remove device attribute files */ 251 device_remove_file(&interface->dev, &dev_attr_port0); 252 device_remove_file(&interface->dev, &dev_attr_port1); 253 /* the intfdata can be set to NULL only after the 254 * device files have been removed */ 255 usb_set_intfdata(interface, NULL); 256 257 usb_put_dev(dev->udev); 258 259 dev_info(&interface->dev, 260 "Cypress CY7C63xxx device now disconnected\n"); 261 262 kfree(dev); 263 } 264 265 static struct usb_driver cypress_driver = { 266 .name = "cypress_cy7c63", 267 .probe = cypress_probe, 268 .disconnect = cypress_disconnect, 269 .id_table = cypress_table, 270 }; 271 272 static int __init cypress_init(void) 273 { 274 int result; 275 276 /* register this driver with the USB subsystem */ 277 result = usb_register(&cypress_driver); 278 if (result) { 279 err("Function usb_register failed! Error number: %d\n", result); 280 } 281 282 return result; 283 } 284 285 static void __exit cypress_exit(void) 286 { 287 /* deregister this driver with the USB subsystem */ 288 usb_deregister(&cypress_driver); 289 } 290 291 module_init(cypress_init); 292 module_exit(cypress_exit); 293 294 MODULE_AUTHOR(DRIVER_AUTHOR); 295 MODULE_DESCRIPTION(DRIVER_DESC); 296 297 MODULE_LICENSE("GPL"); 298