USB: Added driver for a Delcom USB 7-segment LED Display
Added basic support for a Delcom USB 7-segment LED Display
Signed-off by: Harrison Metzger <harrisonmetz@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/misc/usbsevseg.c b/drivers/usb/misc/usbsevseg.c
new file mode 100644
index 0000000..28a6a3a
--- /dev/null
+++ b/drivers/usb/misc/usbsevseg.c
@@ -0,0 +1,394 @@
+/*
+ * USB 7 Segment Driver
+ *
+ * Copyright (C) 2008 Harrison Metzger <harrisonmetz@gmail.com>
+ * Based on usbled.c by Greg Kroah-Hartman (greg@kroah.com)
+ *
+ * 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/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/usb.h>
+
+
+#define DRIVER_AUTHOR "Harrison Metzger <harrisonmetz@gmail.com>"
+#define DRIVER_DESC "USB 7 Segment Driver"
+
+#define VENDOR_ID 0x0fc5
+#define PRODUCT_ID 0x1227
+#define MAXLEN 6
+
+/* table of devices that work with this driver */
+static struct usb_device_id id_table[] = {
+ { USB_DEVICE(VENDOR_ID, PRODUCT_ID) },
+ { },
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+/* the different text display modes the device is capable of */
+static char *display_textmodes[] = {"raw", "hex", "ascii", NULL};
+
+struct usb_sevsegdev {
+ struct usb_device *udev;
+
+ u8 powered;
+ u8 mode_msb;
+ u8 mode_lsb;
+ u8 decimals[MAXLEN];
+ u8 textmode;
+ u8 text[MAXLEN];
+ u16 textlength;
+};
+
+/* sysfs_streq can't replace this completely
+ * If the device was in hex mode, and the user wanted a 0,
+ * if str commands are used, we would assume the end of string
+ * so mem commands are used.
+ */
+inline size_t my_memlen(const char *buf, size_t count)
+{
+ if (count > 0 && buf[count-1] == '\n')
+ return count - 1;
+ else
+ return count;
+}
+
+static void update_display_powered(struct usb_sevsegdev *mydev)
+{
+ int rc;
+
+ rc = usb_control_msg(mydev->udev,
+ usb_sndctrlpipe(mydev->udev, 0),
+ 0x12,
+ 0x48,
+ (80 * 0x100) + 10, /* (power mode) */
+ (0x00 * 0x100) + (mydev->powered ? 1 : 0),
+ NULL,
+ 0,
+ 2000);
+ if (rc < 0)
+ dev_dbg(&mydev->udev->dev, "power retval = %d\n", rc);
+}
+
+static void update_display_mode(struct usb_sevsegdev *mydev)
+{
+ int rc;
+
+ rc = usb_control_msg(mydev->udev,
+ usb_sndctrlpipe(mydev->udev, 0),
+ 0x12,
+ 0x48,
+ (82 * 0x100) + 10, /* (set mode) */
+ (mydev->mode_msb * 0x100) + mydev->mode_lsb,
+ NULL,
+ 0,
+ 2000);
+
+ if (rc < 0)
+ dev_dbg(&mydev->udev->dev, "mode retval = %d\n", rc);
+}
+
+static void update_display_visual(struct usb_sevsegdev *mydev)
+{
+ int rc;
+ int i;
+ unsigned char *buffer;
+ u8 decimals = 0;
+
+ buffer = kzalloc(MAXLEN, GFP_KERNEL);
+ if (!buffer) {
+ dev_err(&mydev->udev->dev, "out of memory\n");
+ return;
+ }
+
+ /* The device is right to left, where as you write left to right */
+ for (i = 0; i < mydev->textlength; i++)
+ buffer[i] = mydev->text[mydev->textlength-1-i];
+
+ rc = usb_control_msg(mydev->udev,
+ usb_sndctrlpipe(mydev->udev, 0),
+ 0x12,
+ 0x48,
+ (85 * 0x100) + 10, /* (write text) */
+ (0 * 0x100) + mydev->textmode, /* mode */
+ buffer,
+ mydev->textlength,
+ 2000);
+
+ if (rc < 0)
+ dev_dbg(&mydev->udev->dev, "write retval = %d\n", rc);
+
+ kfree(buffer);
+
+ /* The device is right to left, where as you write left to right */
+ for (i = 0; i < sizeof(mydev->decimals); i++)
+ decimals |= mydev->decimals[i] << i;
+
+ rc = usb_control_msg(mydev->udev,
+ usb_sndctrlpipe(mydev->udev, 0),
+ 0x12,
+ 0x48,
+ (86 * 0x100) + 10, /* (set decimal) */
+ (0 * 0x100) + decimals, /* decimals */
+ NULL,
+ 0,
+ 2000);
+
+ if (rc < 0)
+ dev_dbg(&mydev->udev->dev, "decimal retval = %d\n", rc);
+}
+
+#define MYDEV_ATTR_SIMPLE_UNSIGNED(name, update_fcn) \
+static ssize_t show_attr_##name(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ struct usb_interface *intf = to_usb_interface(dev); \
+ struct usb_sevsegdev *mydev = usb_get_intfdata(intf); \
+ \
+ return sprintf(buf, "%u\n", mydev->name); \
+} \
+ \
+static ssize_t set_attr_##name(struct device *dev, \
+ struct device_attribute *attr, const char *buf, size_t count) \
+{ \
+ struct usb_interface *intf = to_usb_interface(dev); \
+ struct usb_sevsegdev *mydev = usb_get_intfdata(intf); \
+ \
+ mydev->name = simple_strtoul(buf, NULL, 10); \
+ update_fcn(mydev); \
+ \
+ return count; \
+} \
+static DEVICE_ATTR(name, S_IWUGO | S_IRUGO, show_attr_##name, set_attr_##name);
+
+static ssize_t show_attr_text(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
+
+ return snprintf(buf, mydev->textlength, "%s\n", mydev->text);
+}
+
+static ssize_t set_attr_text(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
+ size_t end = my_memlen(buf, count);
+
+ if (end > sizeof(mydev->text))
+ return -EINVAL;
+
+ memset(mydev->text, 0, sizeof(mydev->text));
+ mydev->textlength = end;
+
+ if (end > 0)
+ memcpy(mydev->text, buf, end);
+
+ update_display_visual(mydev);
+ return count;
+}
+
+static DEVICE_ATTR(text, S_IWUGO | S_IRUGO, show_attr_text, set_attr_text);
+
+static ssize_t show_attr_decimals(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
+ int i;
+ int pos;
+
+ for (i = 0; i < sizeof(mydev->decimals); i++) {
+ pos = sizeof(mydev->decimals) - 1 - i;
+ if (mydev->decimals[i] == 0)
+ buf[pos] = '0';
+ else if (mydev->decimals[i] == 1)
+ buf[pos] = '1';
+ else
+ buf[pos] = 'x';
+ }
+
+ buf[sizeof(mydev->decimals)] = '\n';
+ return sizeof(mydev->decimals) + 1;
+}
+
+static ssize_t set_attr_decimals(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
+ size_t end = my_memlen(buf, count);
+ int i;
+
+ if (end > sizeof(mydev->decimals))
+ return -EINVAL;
+
+ for (i = 0; i < end; i++)
+ if (buf[i] != '0' && buf[i] != '1')
+ return -EINVAL;
+
+ memset(mydev->decimals, 0, sizeof(mydev->decimals));
+ for (i = 0; i < end; i++)
+ if (buf[i] == '1')
+ mydev->decimals[end-1-i] = 1;
+
+ update_display_visual(mydev);
+
+ return count;
+}
+
+static DEVICE_ATTR(decimals, S_IWUGO | S_IRUGO,
+ show_attr_decimals, set_attr_decimals);
+
+static ssize_t show_attr_textmode(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
+ int i;
+
+ buf[0] = 0;
+
+ for (i = 0; display_textmodes[i]; i++) {
+ if (mydev->textmode == i) {
+ strcat(buf, " [");
+ strcat(buf, display_textmodes[i]);
+ strcat(buf, "] ");
+ } else {
+ strcat(buf, " ");
+ strcat(buf, display_textmodes[i]);
+ strcat(buf, " ");
+ }
+ }
+ strcat(buf, "\n");
+
+
+ return strlen(buf);
+}
+
+static ssize_t set_attr_textmode(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
+ int i;
+
+ for (i = 0; display_textmodes[i]; i++) {
+ if (sysfs_streq(display_textmodes[i], buf)) {
+ mydev->textmode = i;
+ update_display_visual(mydev);
+ return count;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static DEVICE_ATTR(textmode, S_IWUGO | S_IRUGO,
+ show_attr_textmode, set_attr_textmode);
+
+
+MYDEV_ATTR_SIMPLE_UNSIGNED(powered, update_display_powered);
+MYDEV_ATTR_SIMPLE_UNSIGNED(mode_msb, update_display_mode);
+MYDEV_ATTR_SIMPLE_UNSIGNED(mode_lsb, update_display_mode);
+
+static struct attribute *dev_attrs[] = {
+ &dev_attr_powered.attr,
+ &dev_attr_text.attr,
+ &dev_attr_textmode.attr,
+ &dev_attr_decimals.attr,
+ &dev_attr_mode_msb.attr,
+ &dev_attr_mode_lsb.attr,
+ NULL
+};
+
+static struct attribute_group dev_attr_grp = {
+ .attrs = dev_attrs,
+};
+
+static int sevseg_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ struct usb_device *udev = interface_to_usbdev(interface);
+ struct usb_sevsegdev *mydev = NULL;
+ int rc = -ENOMEM;
+
+ mydev = kzalloc(sizeof(struct usb_sevsegdev), GFP_KERNEL);
+ if (mydev == NULL) {
+ dev_err(&interface->dev, "Out of memory\n");
+ goto error_mem;
+ }
+
+ mydev->udev = usb_get_dev(udev);
+ usb_set_intfdata(interface, mydev);
+
+ /*set defaults */
+ mydev->textmode = 0x02; /* ascii mode */
+ mydev->mode_msb = 0x06; /* 6 characters */
+ mydev->mode_lsb = 0x3f; /* scanmode for 6 chars */
+
+ rc = sysfs_create_group(&interface->dev.kobj, &dev_attr_grp);
+ if (rc)
+ goto error;
+
+ dev_info(&interface->dev, "USB 7 Segment device now attached\n");
+ return 0;
+
+error:
+ usb_set_intfdata(interface, NULL);
+ usb_put_dev(mydev->udev);
+ kfree(mydev);
+error_mem:
+ return rc;
+}
+
+static void sevseg_disconnect(struct usb_interface *interface)
+{
+ struct usb_sevsegdev *mydev;
+
+ mydev = usb_get_intfdata(interface);
+ sysfs_remove_group(&interface->dev.kobj, &dev_attr_grp);
+ usb_set_intfdata(interface, NULL);
+ usb_put_dev(mydev->udev);
+ kfree(mydev);
+ dev_info(&interface->dev, "USB 7 Segment now disconnected\n");
+}
+
+static struct usb_driver sevseg_driver = {
+ .name = "usbsevseg",
+ .probe = sevseg_probe,
+ .disconnect = sevseg_disconnect,
+ .id_table = id_table,
+};
+
+static int __init usb_sevseg_init(void)
+{
+ int rc = 0;
+
+ rc = usb_register(&sevseg_driver);
+ if (rc)
+ err("usb_register failed. Error number %d", rc);
+ return rc;
+}
+
+static void __exit usb_sevseg_exit(void)
+{
+ usb_deregister(&sevseg_driver);
+}
+
+module_init(usb_sevseg_init);
+module_exit(usb_sevseg_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");