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