397 lines
9.5 KiB
C
397 lines
9.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* USB 7 Segment Driver
|
|
*
|
|
* Copyright (C) 2008 Harrison Metzger <harrisonmetz@gmail.com>
|
|
* Based on usbled.c by Greg Kroah-Hartman (greg@kroah.com)
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.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 8
|
|
|
|
/* table of devices that work with this driver */
|
|
static const 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 const char *display_textmodes[] = {"raw", "hex", "ascii"};
|
|
|
|
struct usb_sevsegdev {
|
|
struct usb_device *udev;
|
|
struct usb_interface *intf;
|
|
|
|
u8 powered;
|
|
u8 mode_msb;
|
|
u8 mode_lsb;
|
|
u8 decimals[MAXLEN];
|
|
u8 textmode;
|
|
u8 text[MAXLEN];
|
|
u16 textlength;
|
|
|
|
u8 shadow_power; /* for PM */
|
|
u8 has_interface_pm;
|
|
};
|
|
|
|
/* 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.
|
|
*/
|
|
static 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;
|
|
|
|
if (mydev->powered && !mydev->has_interface_pm) {
|
|
rc = usb_autopm_get_interface(mydev->intf);
|
|
if (rc < 0)
|
|
return;
|
|
mydev->has_interface_pm = 1;
|
|
}
|
|
|
|
if (mydev->shadow_power != 1)
|
|
return;
|
|
|
|
rc = usb_control_msg_send(mydev->udev, 0, 0x12, 0x48,
|
|
(80 * 0x100) + 10, /* (power mode) */
|
|
(0x00 * 0x100) + (mydev->powered ? 1 : 0),
|
|
NULL, 0, 2000, GFP_KERNEL);
|
|
if (rc < 0)
|
|
dev_dbg(&mydev->udev->dev, "power retval = %d\n", rc);
|
|
|
|
if (!mydev->powered && mydev->has_interface_pm) {
|
|
usb_autopm_put_interface(mydev->intf);
|
|
mydev->has_interface_pm = 0;
|
|
}
|
|
}
|
|
|
|
static void update_display_mode(struct usb_sevsegdev *mydev)
|
|
{
|
|
int rc;
|
|
|
|
if(mydev->shadow_power != 1)
|
|
return;
|
|
|
|
rc = usb_control_msg_send(mydev->udev, 0, 0x12, 0x48,
|
|
(82 * 0x100) + 10, /* (set mode) */
|
|
(mydev->mode_msb * 0x100) + mydev->mode_lsb,
|
|
NULL, 0, 2000, GFP_NOIO);
|
|
|
|
if (rc < 0)
|
|
dev_dbg(&mydev->udev->dev, "mode retval = %d\n", rc);
|
|
}
|
|
|
|
static void update_display_visual(struct usb_sevsegdev *mydev, gfp_t mf)
|
|
{
|
|
int rc;
|
|
int i;
|
|
unsigned char buffer[MAXLEN] = {0};
|
|
u8 decimals = 0;
|
|
|
|
if(mydev->shadow_power != 1)
|
|
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_send(mydev->udev, 0, 0x12, 0x48,
|
|
(85 * 0x100) + 10, /* (write text) */
|
|
(0 * 0x100) + mydev->textmode, /* mode */
|
|
&buffer, mydev->textlength, 2000, mf);
|
|
|
|
if (rc < 0)
|
|
dev_dbg(&mydev->udev->dev, "write retval = %d\n", rc);
|
|
|
|
/* 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_send(mydev->udev, 0, 0x12, 0x48,
|
|
(86 * 0x100) + 10, /* (set decimal) */
|
|
(0 * 0x100) + decimals, /* decimals */
|
|
NULL, 0, 2000, mf);
|
|
|
|
if (rc < 0)
|
|
dev_dbg(&mydev->udev->dev, "decimal retval = %d\n", rc);
|
|
}
|
|
|
|
#define MYDEV_ATTR_SIMPLE_UNSIGNED(name, update_fcn) \
|
|
static ssize_t name##_show(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 name##_store(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_RW(name);
|
|
|
|
static ssize_t text_show(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 text_store(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, GFP_KERNEL);
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR_RW(text);
|
|
|
|
static ssize_t decimals_show(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 decimals_store(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, GFP_KERNEL);
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR_RW(decimals);
|
|
|
|
static ssize_t textmode_show(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; i < ARRAY_SIZE(display_textmodes); 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 textmode_store(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;
|
|
|
|
i = sysfs_match_string(display_textmodes, buf);
|
|
if (i < 0)
|
|
return i;
|
|
|
|
mydev->textmode = i;
|
|
update_display_visual(mydev, GFP_KERNEL);
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR_RW(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 *sevseg_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
|
|
};
|
|
ATTRIBUTE_GROUPS(sevseg);
|
|
|
|
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)
|
|
goto error_mem;
|
|
|
|
mydev->udev = usb_get_dev(udev);
|
|
mydev->intf = interface;
|
|
usb_set_intfdata(interface, mydev);
|
|
|
|
/* PM */
|
|
mydev->shadow_power = 1; /* currently active */
|
|
mydev->has_interface_pm = 0; /* have not issued autopm_get */
|
|
|
|
/*set defaults */
|
|
mydev->textmode = 0x02; /* ascii mode */
|
|
mydev->mode_msb = 0x06; /* 6 characters */
|
|
mydev->mode_lsb = 0x3f; /* scanmode for 6 chars */
|
|
|
|
dev_info(&interface->dev, "USB 7 Segment device now attached\n");
|
|
return 0;
|
|
|
|
error_mem:
|
|
return rc;
|
|
}
|
|
|
|
static void sevseg_disconnect(struct usb_interface *interface)
|
|
{
|
|
struct usb_sevsegdev *mydev;
|
|
|
|
mydev = usb_get_intfdata(interface);
|
|
usb_set_intfdata(interface, NULL);
|
|
usb_put_dev(mydev->udev);
|
|
kfree(mydev);
|
|
dev_info(&interface->dev, "USB 7 Segment now disconnected\n");
|
|
}
|
|
|
|
static int sevseg_suspend(struct usb_interface *intf, pm_message_t message)
|
|
{
|
|
struct usb_sevsegdev *mydev;
|
|
|
|
mydev = usb_get_intfdata(intf);
|
|
mydev->shadow_power = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sevseg_resume(struct usb_interface *intf)
|
|
{
|
|
struct usb_sevsegdev *mydev;
|
|
|
|
mydev = usb_get_intfdata(intf);
|
|
mydev->shadow_power = 1;
|
|
update_display_mode(mydev);
|
|
update_display_visual(mydev, GFP_NOIO);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sevseg_reset_resume(struct usb_interface *intf)
|
|
{
|
|
struct usb_sevsegdev *mydev;
|
|
|
|
mydev = usb_get_intfdata(intf);
|
|
mydev->shadow_power = 1;
|
|
update_display_mode(mydev);
|
|
update_display_visual(mydev, GFP_NOIO);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct usb_driver sevseg_driver = {
|
|
.name = "usbsevseg",
|
|
.probe = sevseg_probe,
|
|
.disconnect = sevseg_disconnect,
|
|
.suspend = sevseg_suspend,
|
|
.resume = sevseg_resume,
|
|
.reset_resume = sevseg_reset_resume,
|
|
.id_table = id_table,
|
|
.dev_groups = sevseg_groups,
|
|
.supports_autosuspend = 1,
|
|
};
|
|
|
|
module_usb_driver(sevseg_driver);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|