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>

1 files changed, 394 insertions, 0 deletions

diff --git a/drivers/usb/misc/usbsevseg.c b/drivers/usb/misc/usbsevseg.c
new file mode 100644
index 000000000000..28a6a3a09538
--- /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");