diff options
Diffstat (limited to 'drivers/usb/misc/usbsevseg.c')
| -rw-r--r-- | drivers/usb/misc/usbsevseg.c | 394 |
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 00000000000..28a6a3a0953 --- /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"); |