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a21350feb9
USB drivers now support the ability for the driver core to handle the creation and removal of device-specific sysfs files in a race-free manner. Take advantage of that by converting the driver to use this by moving the sysfs attributes into a group and assigning the dev_groups pointer to it. Link: https://lore.kernel.org/r/20190806144502.17792-12-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
423 lines
9.6 KiB
C
423 lines
9.6 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 name##_show(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 name##_store(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_RW(name);
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static ssize_t text_show(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 text_store(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_RW(text);
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static ssize_t decimals_show(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 decimals_store(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_RW(decimals);
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static ssize_t textmode_show(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 textmode_store(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_RW(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 *sevseg_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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ATTRIBUTE_GROUPS(sevseg);
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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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dev_info(&interface->dev, "USB 7 Segment device now attached\n");
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return 0;
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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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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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.dev_groups = sevseg_groups,
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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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