/* * cy7c63.c * * Copyright (c) 2006 Oliver Bock (bock@fh-wolfenbuettel.de) * * This driver is based on the Cypress Thermometer USB Driver by * Marcus Maul and the 2.0 version of Greg Kroah-Hartman's * USB Skeleton driver. * * Is is a generic driver for the Cypress CY7C63000 family. * For the time being it enables you to toggle the single I/O ports * of the device. * * Supported vendors: AK Modul-Bus Computer GmbH * Supported devices: CY7C63001A-PC (to be continued...) * Supported functions: Read/Write Ports (to be continued...) * * Chipsets families: CY7C63000, CY7C63001, CY7C63100, CY7C63101 * * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation, version 2. */ #include #include #include #include #define DRIVER_AUTHOR "Oliver Bock (bock@fh-wolfenbuettel.de)" #define DRIVER_DESC "Cypress CY7C63xxx USB driver" #define CY7C63_VENDOR_ID 0xa2c #define CY7C63_PRODUCT_ID 0x8 #define CY7C63_READ_PORT 0x4 #define CY7C63_WRITE_PORT 0x5 #define CY7C63_READ_RAM 0x2 #define CY7C63_WRITE_RAM 0x3 #define CY7C63_READ_ROM 0x1 #define CY7C63_READ_PORT_ID0 0 #define CY7C63_WRITE_PORT_ID0 0 #define CY7C63_READ_PORT_ID1 0x2 #define CY7C63_WRITE_PORT_ID1 1 #define CY7C63_MAX_REQSIZE 8 /* table of devices that work with this driver */ static struct usb_device_id cy7c63_table [] = { { USB_DEVICE(CY7C63_VENDOR_ID, CY7C63_PRODUCT_ID) }, { } }; MODULE_DEVICE_TABLE(usb, cy7c63_table); /* structure to hold all of our device specific stuff */ struct cy7c63 { struct usb_device * udev; char port0; char port1; }; /* used to send usb control messages to device */ int vendor_command(struct cy7c63 *dev, unsigned char request, unsigned char address, unsigned char data) { int retval = 0; unsigned int pipe; unsigned char *iobuf; /* allocate some memory for the i/o buffer*/ iobuf = kzalloc(CY7C63_MAX_REQSIZE, GFP_KERNEL); if (!iobuf) { dev_err(&dev->udev->dev, "Out of memory!\n"); retval = -ENOMEM; goto error; } dev_dbg(&dev->udev->dev, "Sending usb_control_msg (data: %d)\n", data); /* prepare usb control message and send it upstream */ pipe = usb_rcvctrlpipe(dev->udev, 0); retval = usb_control_msg(dev->udev, pipe, request, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER, address, data, iobuf, CY7C63_MAX_REQSIZE, USB_CTRL_GET_TIMEOUT); /* store returned data (more READs to be added!) */ switch (request) { case CY7C63_READ_PORT: if (address == CY7C63_READ_PORT_ID0) { dev->port0 = iobuf[1]; dev_dbg(&dev->udev->dev, "READ_PORT0 returned: %d\n",dev->port0); } else if (address == CY7C63_READ_PORT_ID1) { dev->port1 = iobuf[1]; dev_dbg(&dev->udev->dev, "READ_PORT1 returned: %d\n",dev->port1); } break; } kfree(iobuf); error: return retval; } #define get_set_port(num,read_id,write_id) \ static ssize_t set_port##num(struct device *dev, struct device_attribute *attr, \ const char *buf, size_t count) { \ \ int value; \ int result = 0; \ \ struct usb_interface *intf = to_usb_interface(dev); \ struct cy7c63 *cyp = usb_get_intfdata(intf); \ \ dev_dbg(&cyp->udev->dev, "WRITE_PORT%d called\n", num); \ \ /* validate input data */ \ if (sscanf(buf, "%d", &value) < 1) { \ result = -EINVAL; \ goto error; \ } \ if (value>255 || value<0) { \ result = -EINVAL; \ goto error; \ } \ \ result = vendor_command(cyp, CY7C63_WRITE_PORT, write_id, \ (unsigned char)value); \ \ dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n",result); \ error: \ return result < 0 ? result : count; \ } \ \ static ssize_t get_port##num(struct device *dev, \ struct device_attribute *attr, char *buf) { \ \ int result = 0; \ \ struct usb_interface *intf = to_usb_interface(dev); \ struct cy7c63 *cyp = usb_get_intfdata(intf); \ \ dev_dbg(&cyp->udev->dev, "READ_PORT%d called\n", num); \ \ result = vendor_command(cyp, CY7C63_READ_PORT, read_id, 0); \ \ dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result); \ \ return sprintf(buf, "%d", cyp->port##num); \ } \ static DEVICE_ATTR(port##num, S_IWUGO | S_IRUGO, get_port##num, set_port##num); get_set_port(0, CY7C63_READ_PORT_ID0, CY7C63_WRITE_PORT_ID0); get_set_port(1, CY7C63_READ_PORT_ID1, CY7C63_WRITE_PORT_ID1); static int cy7c63_probe(struct usb_interface *interface, const struct usb_device_id *id) { struct cy7c63 *dev = NULL; int retval = -ENOMEM; /* allocate memory for our device state and initialize it */ dev = kzalloc(sizeof(*dev), GFP_KERNEL); if (dev == NULL) { dev_err(&dev->udev->dev, "Out of memory!\n"); goto error; } dev->udev = usb_get_dev(interface_to_usbdev(interface)); /* save our data pointer in this interface device */ usb_set_intfdata(interface, dev); /* create device attribute files */ device_create_file(&interface->dev, &dev_attr_port0); device_create_file(&interface->dev, &dev_attr_port1); /* let the user know what node this device is now attached to */ dev_info(&interface->dev, "Cypress CY7C63xxx device now attached\n"); retval = 0; error: return retval; } static void cy7c63_disconnect(struct usb_interface *interface) { struct cy7c63 *dev; dev = usb_get_intfdata(interface); usb_set_intfdata(interface, NULL); /* remove device attribute files */ device_remove_file(&interface->dev, &dev_attr_port0); device_remove_file(&interface->dev, &dev_attr_port1); usb_put_dev(dev->udev); dev_info(&interface->dev, "Cypress CY7C63xxx device now disconnected\n"); kfree(dev); } static struct usb_driver cy7c63_driver = { .name = "cy7c63", .probe = cy7c63_probe, .disconnect = cy7c63_disconnect, .id_table = cy7c63_table, }; static int __init cy7c63_init(void) { int result; /* register this driver with the USB subsystem */ result = usb_register(&cy7c63_driver); if (result) { err("Function usb_register failed! Error number: %d\n", result); } return result; } static void __exit cy7c63_exit(void) { /* deregister this driver with the USB subsystem */ usb_deregister(&cy7c63_driver); } module_init(cy7c63_init); module_exit(cy7c63_exit); MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL");