[PATCH] USB: rename Cypress CY7C63xxx driver to proper name and fix up some tiny things

This is a new driver for the Cypress CY7C63xxx mirco controller series.
It currently supports the pre-programmed CYC63001A-PC by AK Modul-Bus
GmbH.  It's based on a kernel 2.4 driver (cyport) by Marcus Maul which I
ported to kernel 2.6 using sysfs. I intend to support more controllers
of this family (and more features) as soon as I get hold of the required
IDs etc. Please see the source code's header for more information.

Signed-off-by: Oliver Bock <o.bock@fh-wolfenbuettel.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 279 insertions, 0 deletions

diff --git a/drivers/usb/misc/cypress_cy7c63.c b/drivers/usb/misc/cypress_cy7c63.c
new file mode 100644
index 000000000000..e091d327bd9e
--- /dev/null
+++ b/drivers/usb/misc/cypress_cy7c63.c
@@ -0,0 +1,279 @@
+/*
+* cypress_cy7c63.c
+*
+* Copyright (c) 2006 Oliver Bock (o.bock@fh-wolfenbuettel.de)
+*
+*       This driver is based on the Cypress USB Driver by Marcus Maul
+*       (cyport) and the 2.0 version of Greg Kroah-Hartman's
+*       USB Skeleton driver.
+*
+*       This is a generic driver for the Cypress CY7C63xxx family.
+*       For the time being it enables you to read from and write to
+*       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...)
+*
+*
+*       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 (o.bock@fh-wolfenbuettel.de)"
+#define DRIVER_DESC             "Cypress CY7C63xxx USB driver"
+
+#define CYPRESS_VENDOR_ID       0xa2c
+#define CYPRESS_PRODUCT_ID      0x8
+
+#define CYPRESS_READ_PORT       0x4
+#define CYPRESS_WRITE_PORT      0x5
+
+#define CYPRESS_READ_RAM        0x2
+#define CYPRESS_WRITE_RAM       0x3
+#define CYPRESS_READ_ROM        0x1
+
+#define CYPRESS_READ_PORT_ID0   0
+#define CYPRESS_WRITE_PORT_ID0  0
+#define CYPRESS_READ_PORT_ID1   0x2
+#define CYPRESS_WRITE_PORT_ID1  1
+
+#define CYPRESS_MAX_REQSIZE     8
+
+
+/* table of devices that work with this driver */
+static struct usb_device_id cypress_table [] = {
+        { USB_DEVICE(CYPRESS_VENDOR_ID, CYPRESS_PRODUCT_ID) },
+        { }
+};
+MODULE_DEVICE_TABLE(usb, cypress_table);
+
+/* structure to hold all of our device specific stuff */
+struct cypress {
+        struct usb_device *     udev;
+        unsigned char           port[2];
+};
+
+/* used to send usb control messages to device */
+static int vendor_command(struct cypress *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(CYPRESS_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, CYPRESS_MAX_REQSIZE,
+                                 USB_CTRL_GET_TIMEOUT);
+
+        /* store returned data (more READs to be added) */
+        switch (request) {
+                case CYPRESS_READ_PORT:
+                        if (address == CYPRESS_READ_PORT_ID0) {
+                                dev->port[0] = iobuf[1];
+                                dev_dbg(&dev->udev->dev,
+                                        "READ_PORT0 returned: %d\n",
+                                        dev->port[0]);
+                        }
+                        else if (address == CYPRESS_READ_PORT_ID1) {
+                                dev->port[1] = iobuf[1];
+                                dev_dbg(&dev->udev->dev,
+                                        "READ_PORT1 returned: %d\n",
+                                        dev->port[1]);
+                        }
+                        break;
+        }
+
+        kfree(iobuf);
+error:
+        return retval;
+}
+
+/* write port value */
+static ssize_t write_port(struct device *dev, struct device_attribute *attr,
+                          const char *buf, size_t count,
+                          int port_num, int write_id)
+{
+        int value = -1;
+        int result = 0;
+
+        struct usb_interface *intf = to_usb_interface(dev);
+        struct cypress *cyp = usb_get_intfdata(intf);
+
+        dev_dbg(&cyp->udev->dev, "WRITE_PORT%d called\n", port_num);
+
+        /* validate input data */
+        if (sscanf(buf, "%d", &value) < 1) {
+                result = -EINVAL;
+                goto error;
+        }
+        if (value < 0 || value > 255) {
+                result = -EINVAL;
+                goto error;
+        }
+
+        result = vendor_command(cyp, CYPRESS_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;
+}
+
+/* attribute callback handler (write) */
+static ssize_t set_port0_handler(struct device *dev,
+                                 struct device_attribute *attr,
+                                 const char *buf, size_t count)
+{
+        return write_port(dev, attr, buf, count, 0, CYPRESS_WRITE_PORT_ID0);
+}
+
+/* attribute callback handler (write) */
+static ssize_t set_port1_handler(struct device *dev,
+                                 struct device_attribute *attr,
+                                 const char *buf, size_t count)
+{
+        return write_port(dev, attr, buf, count, 1, CYPRESS_WRITE_PORT_ID1);
+}
+
+/* read port value */
+static ssize_t read_port(struct device *dev, struct device_attribute *attr,
+                         char *buf, int port_num, int read_id)
+{
+        int result = 0;
+
+        struct usb_interface *intf = to_usb_interface(dev);
+        struct cypress *cyp = usb_get_intfdata(intf);
+
+        dev_dbg(&cyp->udev->dev, "READ_PORT%d called\n", port_num);
+
+        result = vendor_command(cyp, CYPRESS_READ_PORT, read_id, 0);
+
+        dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result);
+
+        return sprintf(buf, "%d", cyp->port[port_num]);
+}
+
+/* attribute callback handler (read) */
+static ssize_t get_port0_handler(struct device *dev,
+                                 struct device_attribute *attr, char *buf)
+{
+        return read_port(dev, attr, buf, 0, CYPRESS_READ_PORT_ID0);
+}
+
+/* attribute callback handler (read) */
+static ssize_t get_port1_handler(struct device *dev,
+                                 struct device_attribute *attr, char *buf)
+{
+        return read_port(dev, attr, buf, 1, CYPRESS_READ_PORT_ID1);
+}
+
+static DEVICE_ATTR(port0, S_IWUGO | S_IRUGO,
+                   get_port0_handler, set_port0_handler);
+
+static DEVICE_ATTR(port1, S_IWUGO | S_IRUGO,
+                   get_port1_handler, set_port1_handler);
+
+
+static int cypress_probe(struct usb_interface *interface,
+                         const struct usb_device_id *id)
+{
+        struct cypress *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 that the device is now attached */
+        dev_info(&interface->dev,
+                 "Cypress CY7C63xxx device now attached\n");
+
+        retval = 0;
+error:
+        return retval;
+}
+
+static void cypress_disconnect(struct usb_interface *interface)
+{
+        struct cypress *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 cypress_driver = {
+        .name = "cypress_cy7c63",
+        .probe = cypress_probe,
+        .disconnect = cypress_disconnect,
+        .id_table = cypress_table,
+};
+
+static int __init cypress_init(void)
+{
+        int result;
+
+        /* register this driver with the USB subsystem */
+        result = usb_register(&cypress_driver);
+        if (result) {
+                err("Function usb_register failed! Error number: %d\n", result);
+        }
+
+        return result;
+}
+
+static void __exit cypress_exit(void)
+{
+        /* deregister this driver with the USB subsystem */
+        usb_deregister(&cypress_driver);
+}
+
+module_init(cypress_init);
+module_exit(cypress_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+
+MODULE_LICENSE("GPL");