![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Keith Packard <keithp@keithp.com> Cc: Juergen Stuber <starblue@users.sourceforge.net> Cc: Cesar Miquel <miquel@df.uba.ar> Cc: Richard Leitner <richard.leitner@skidata.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
434 lines
10 KiB
C
434 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* USB 7 Segment Driver
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*
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* Copyright (C) 2008 Harrison Metzger <harrisonmetz@gmail.com>
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* Based on usbled.c by Greg Kroah-Hartman (greg@kroah.com)
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/usb.h>
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#define DRIVER_AUTHOR "Harrison Metzger <harrisonmetz@gmail.com>"
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#define DRIVER_DESC "USB 7 Segment Driver"
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#define VENDOR_ID 0x0fc5
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#define PRODUCT_ID 0x1227
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#define MAXLEN 8
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/* table of devices that work with this driver */
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static const struct usb_device_id id_table[] = {
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{ USB_DEVICE(VENDOR_ID, PRODUCT_ID) },
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{ },
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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/* the different text display modes the device is capable of */
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static const char *display_textmodes[] = {"raw", "hex", "ascii"};
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struct usb_sevsegdev {
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struct usb_device *udev;
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struct usb_interface *intf;
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u8 powered;
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u8 mode_msb;
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u8 mode_lsb;
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u8 decimals[MAXLEN];
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u8 textmode;
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u8 text[MAXLEN];
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u16 textlength;
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u8 shadow_power; /* for PM */
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u8 has_interface_pm;
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};
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/* sysfs_streq can't replace this completely
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* If the device was in hex mode, and the user wanted a 0,
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* if str commands are used, we would assume the end of string
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* so mem commands are used.
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*/
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static inline size_t my_memlen(const char *buf, size_t count)
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{
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if (count > 0 && buf[count-1] == '\n')
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return count - 1;
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else
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return count;
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}
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static void update_display_powered(struct usb_sevsegdev *mydev)
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{
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int rc;
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if (mydev->powered && !mydev->has_interface_pm) {
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rc = usb_autopm_get_interface(mydev->intf);
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if (rc < 0)
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return;
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mydev->has_interface_pm = 1;
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}
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if (mydev->shadow_power != 1)
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return;
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rc = usb_control_msg(mydev->udev,
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usb_sndctrlpipe(mydev->udev, 0),
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0x12,
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0x48,
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(80 * 0x100) + 10, /* (power mode) */
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(0x00 * 0x100) + (mydev->powered ? 1 : 0),
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NULL,
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0,
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2000);
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if (rc < 0)
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dev_dbg(&mydev->udev->dev, "power retval = %d\n", rc);
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if (!mydev->powered && mydev->has_interface_pm) {
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usb_autopm_put_interface(mydev->intf);
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mydev->has_interface_pm = 0;
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}
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}
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static void update_display_mode(struct usb_sevsegdev *mydev)
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{
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int rc;
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if(mydev->shadow_power != 1)
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return;
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rc = usb_control_msg(mydev->udev,
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usb_sndctrlpipe(mydev->udev, 0),
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0x12,
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0x48,
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(82 * 0x100) + 10, /* (set mode) */
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(mydev->mode_msb * 0x100) + mydev->mode_lsb,
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NULL,
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0,
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2000);
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if (rc < 0)
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dev_dbg(&mydev->udev->dev, "mode retval = %d\n", rc);
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}
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static void update_display_visual(struct usb_sevsegdev *mydev, gfp_t mf)
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{
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int rc;
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int i;
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unsigned char *buffer;
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u8 decimals = 0;
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if(mydev->shadow_power != 1)
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return;
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buffer = kzalloc(MAXLEN, mf);
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if (!buffer)
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return;
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/* The device is right to left, where as you write left to right */
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for (i = 0; i < mydev->textlength; i++)
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buffer[i] = mydev->text[mydev->textlength-1-i];
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rc = usb_control_msg(mydev->udev,
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usb_sndctrlpipe(mydev->udev, 0),
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0x12,
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0x48,
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(85 * 0x100) + 10, /* (write text) */
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(0 * 0x100) + mydev->textmode, /* mode */
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buffer,
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mydev->textlength,
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2000);
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if (rc < 0)
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dev_dbg(&mydev->udev->dev, "write retval = %d\n", rc);
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kfree(buffer);
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/* The device is right to left, where as you write left to right */
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for (i = 0; i < sizeof(mydev->decimals); i++)
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decimals |= mydev->decimals[i] << i;
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rc = usb_control_msg(mydev->udev,
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usb_sndctrlpipe(mydev->udev, 0),
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0x12,
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0x48,
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(86 * 0x100) + 10, /* (set decimal) */
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(0 * 0x100) + decimals, /* decimals */
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NULL,
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0,
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2000);
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if (rc < 0)
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dev_dbg(&mydev->udev->dev, "decimal retval = %d\n", rc);
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}
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#define MYDEV_ATTR_SIMPLE_UNSIGNED(name, update_fcn) \
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static ssize_t show_attr_##name(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct usb_interface *intf = to_usb_interface(dev); \
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struct usb_sevsegdev *mydev = usb_get_intfdata(intf); \
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\
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return sprintf(buf, "%u\n", mydev->name); \
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} \
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\
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static ssize_t set_attr_##name(struct device *dev, \
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struct device_attribute *attr, const char *buf, size_t count) \
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{ \
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struct usb_interface *intf = to_usb_interface(dev); \
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struct usb_sevsegdev *mydev = usb_get_intfdata(intf); \
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\
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mydev->name = simple_strtoul(buf, NULL, 10); \
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update_fcn(mydev); \
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\
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return count; \
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} \
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static DEVICE_ATTR(name, S_IRUGO | S_IWUSR, show_attr_##name, set_attr_##name);
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static ssize_t show_attr_text(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
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return snprintf(buf, mydev->textlength, "%s\n", mydev->text);
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}
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static ssize_t set_attr_text(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
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size_t end = my_memlen(buf, count);
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if (end > sizeof(mydev->text))
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return -EINVAL;
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memset(mydev->text, 0, sizeof(mydev->text));
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mydev->textlength = end;
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if (end > 0)
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memcpy(mydev->text, buf, end);
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update_display_visual(mydev, GFP_KERNEL);
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return count;
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}
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static DEVICE_ATTR(text, S_IRUGO | S_IWUSR, show_attr_text, set_attr_text);
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static ssize_t show_attr_decimals(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
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int i;
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int pos;
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for (i = 0; i < sizeof(mydev->decimals); i++) {
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pos = sizeof(mydev->decimals) - 1 - i;
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if (mydev->decimals[i] == 0)
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buf[pos] = '0';
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else if (mydev->decimals[i] == 1)
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buf[pos] = '1';
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else
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buf[pos] = 'x';
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}
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buf[sizeof(mydev->decimals)] = '\n';
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return sizeof(mydev->decimals) + 1;
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}
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static ssize_t set_attr_decimals(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
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size_t end = my_memlen(buf, count);
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int i;
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if (end > sizeof(mydev->decimals))
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return -EINVAL;
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for (i = 0; i < end; i++)
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if (buf[i] != '0' && buf[i] != '1')
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return -EINVAL;
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memset(mydev->decimals, 0, sizeof(mydev->decimals));
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for (i = 0; i < end; i++)
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if (buf[i] == '1')
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mydev->decimals[end-1-i] = 1;
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update_display_visual(mydev, GFP_KERNEL);
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return count;
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}
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static DEVICE_ATTR(decimals, S_IRUGO | S_IWUSR, show_attr_decimals, set_attr_decimals);
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static ssize_t show_attr_textmode(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
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int i;
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buf[0] = 0;
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for (i = 0; i < ARRAY_SIZE(display_textmodes); i++) {
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if (mydev->textmode == i) {
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strcat(buf, " [");
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strcat(buf, display_textmodes[i]);
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strcat(buf, "] ");
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} else {
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strcat(buf, " ");
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strcat(buf, display_textmodes[i]);
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strcat(buf, " ");
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}
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}
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strcat(buf, "\n");
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return strlen(buf);
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}
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static ssize_t set_attr_textmode(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
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int i;
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i = sysfs_match_string(display_textmodes, buf);
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if (i < 0)
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return i;
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mydev->textmode = i;
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update_display_visual(mydev, GFP_KERNEL);
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return count;
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}
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static DEVICE_ATTR(textmode, S_IRUGO | S_IWUSR, show_attr_textmode, set_attr_textmode);
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MYDEV_ATTR_SIMPLE_UNSIGNED(powered, update_display_powered);
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MYDEV_ATTR_SIMPLE_UNSIGNED(mode_msb, update_display_mode);
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MYDEV_ATTR_SIMPLE_UNSIGNED(mode_lsb, update_display_mode);
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static struct attribute *dev_attrs[] = {
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&dev_attr_powered.attr,
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&dev_attr_text.attr,
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&dev_attr_textmode.attr,
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&dev_attr_decimals.attr,
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&dev_attr_mode_msb.attr,
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&dev_attr_mode_lsb.attr,
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NULL
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};
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static const struct attribute_group dev_attr_grp = {
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.attrs = dev_attrs,
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};
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static int sevseg_probe(struct usb_interface *interface,
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const struct usb_device_id *id)
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{
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struct usb_device *udev = interface_to_usbdev(interface);
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struct usb_sevsegdev *mydev = NULL;
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int rc = -ENOMEM;
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mydev = kzalloc(sizeof(struct usb_sevsegdev), GFP_KERNEL);
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if (!mydev)
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goto error_mem;
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mydev->udev = usb_get_dev(udev);
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mydev->intf = interface;
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usb_set_intfdata(interface, mydev);
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/* PM */
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mydev->shadow_power = 1; /* currently active */
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mydev->has_interface_pm = 0; /* have not issued autopm_get */
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/*set defaults */
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mydev->textmode = 0x02; /* ascii mode */
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mydev->mode_msb = 0x06; /* 6 characters */
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mydev->mode_lsb = 0x3f; /* scanmode for 6 chars */
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rc = sysfs_create_group(&interface->dev.kobj, &dev_attr_grp);
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if (rc)
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goto error;
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dev_info(&interface->dev, "USB 7 Segment device now attached\n");
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return 0;
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error:
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usb_set_intfdata(interface, NULL);
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usb_put_dev(mydev->udev);
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kfree(mydev);
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error_mem:
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return rc;
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}
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static void sevseg_disconnect(struct usb_interface *interface)
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{
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struct usb_sevsegdev *mydev;
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mydev = usb_get_intfdata(interface);
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sysfs_remove_group(&interface->dev.kobj, &dev_attr_grp);
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usb_set_intfdata(interface, NULL);
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usb_put_dev(mydev->udev);
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kfree(mydev);
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dev_info(&interface->dev, "USB 7 Segment now disconnected\n");
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}
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static int sevseg_suspend(struct usb_interface *intf, pm_message_t message)
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{
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struct usb_sevsegdev *mydev;
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mydev = usb_get_intfdata(intf);
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mydev->shadow_power = 0;
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return 0;
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}
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static int sevseg_resume(struct usb_interface *intf)
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{
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struct usb_sevsegdev *mydev;
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mydev = usb_get_intfdata(intf);
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mydev->shadow_power = 1;
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update_display_mode(mydev);
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update_display_visual(mydev, GFP_NOIO);
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return 0;
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}
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static int sevseg_reset_resume(struct usb_interface *intf)
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{
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struct usb_sevsegdev *mydev;
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mydev = usb_get_intfdata(intf);
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mydev->shadow_power = 1;
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update_display_mode(mydev);
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update_display_visual(mydev, GFP_NOIO);
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return 0;
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}
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static struct usb_driver sevseg_driver = {
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.name = "usbsevseg",
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.probe = sevseg_probe,
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.disconnect = sevseg_disconnect,
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.suspend = sevseg_suspend,
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.resume = sevseg_resume,
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.reset_resume = sevseg_reset_resume,
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.id_table = id_table,
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.supports_autosuspend = 1,
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};
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module_usb_driver(sevseg_driver);
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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