diff options
Diffstat (limited to 'drivers/usb/misc/cy7c63.c')
| -rw-r--r-- | drivers/usb/misc/cy7c63.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/drivers/usb/misc/cy7c63.c b/drivers/usb/misc/cy7c63.c new file mode 100644 index 0000000..8a1c10b --- /dev/null +++ b/drivers/usb/misc/cy7c63.c @@ -0,0 +1,244 @@ +/* +* 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 <linux/init.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/usb.h> + +#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"); |
