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imon.c
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imon.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* imon.c: input and display driver for SoundGraph iMON IR/VFD/LCD
*
* Copyright(C) 2010 Jarod Wilson <jarod@wilsonet.com>
* Portions based on the original lirc_imon driver,
* Copyright(C) 2004 Venky Raju(dev@venky.ws)
*
* Huge thanks to R. Geoff Newbury for invaluable debugging on the
* 0xffdc iMON devices, and for sending me one to hack on, without
* which the support for them wouldn't be nearly as good. Thanks
* also to the numerous 0xffdc device owners that tested auto-config
* support for me and provided debug dumps from their devices.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/ktime.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/ratelimit.h>
#include <linux/input.h>
#include <linux/usb.h>
#include <linux/usb/input.h>
#include <media/rc-core.h>
#include <linux/timer.h>
#define MOD_AUTHOR "Jarod Wilson <jarod@wilsonet.com>"
#define MOD_DESC "Driver for SoundGraph iMON MultiMedia IR/Display"
#define MOD_NAME "imon"
#define MOD_VERSION "0.9.4"
#define DISPLAY_MINOR_BASE 144
#define DEVICE_NAME "lcd%d"
#define BUF_CHUNK_SIZE 8
#define BUF_SIZE 128
#define BIT_DURATION 250 /* each bit received is 250us */
#define IMON_CLOCK_ENABLE_PACKETS 2
/*** P R O T O T Y P E S ***/
/* USB Callback prototypes */
static int imon_probe(struct usb_interface *interface,
const struct usb_device_id *id);
static void imon_disconnect(struct usb_interface *interface);
static void usb_rx_callback_intf0(struct urb *urb);
static void usb_rx_callback_intf1(struct urb *urb);
static void usb_tx_callback(struct urb *urb);
/* suspend/resume support */
static int imon_resume(struct usb_interface *intf);
static int imon_suspend(struct usb_interface *intf, pm_message_t message);
/* Display file_operations function prototypes */
static int display_open(struct inode *inode, struct file *file);
static int display_close(struct inode *inode, struct file *file);
/* VFD write operation */
static ssize_t vfd_write(struct file *file, const char __user *buf,
size_t n_bytes, loff_t *pos);
/* LCD file_operations override function prototypes */
static ssize_t lcd_write(struct file *file, const char __user *buf,
size_t n_bytes, loff_t *pos);
/*** G L O B A L S ***/
struct imon_panel_key_table {
u64 hw_code;
u32 keycode;
};
struct imon_usb_dev_descr {
__u16 flags;
#define IMON_NO_FLAGS 0
#define IMON_NEED_20MS_PKT_DELAY 1
#define IMON_SUPPRESS_REPEATED_KEYS 2
struct imon_panel_key_table key_table[];
};
struct imon_context {
struct device *dev;
/* Newer devices have two interfaces */
struct usb_device *usbdev_intf0;
struct usb_device *usbdev_intf1;
bool display_supported; /* not all controllers do */
bool display_isopen; /* display port has been opened */
bool rf_device; /* true if iMON 2.4G LT/DT RF device */
bool rf_isassociating; /* RF remote associating */
bool dev_present_intf0; /* USB device presence, interface 0 */
bool dev_present_intf1; /* USB device presence, interface 1 */
struct mutex lock; /* to lock this object */
wait_queue_head_t remove_ok; /* For unexpected USB disconnects */
struct usb_endpoint_descriptor *rx_endpoint_intf0;
struct usb_endpoint_descriptor *rx_endpoint_intf1;
struct usb_endpoint_descriptor *tx_endpoint;
struct urb *rx_urb_intf0;
struct urb *rx_urb_intf1;
struct urb *tx_urb;
bool tx_control;
unsigned char usb_rx_buf[8];
unsigned char usb_tx_buf[8];
unsigned int send_packet_delay;
struct tx_t {
unsigned char data_buf[35]; /* user data buffer */
struct completion finished; /* wait for write to finish */
bool busy; /* write in progress */
int status; /* status of tx completion */
} tx;
u16 vendor; /* usb vendor ID */
u16 product; /* usb product ID */
struct rc_dev *rdev; /* rc-core device for remote */
struct input_dev *idev; /* input device for panel & IR mouse */
struct input_dev *touch; /* input device for touchscreen */
spinlock_t kc_lock; /* make sure we get keycodes right */
u32 kc; /* current input keycode */
u32 last_keycode; /* last reported input keycode */
u32 rc_scancode; /* the computed remote scancode */
u8 rc_toggle; /* the computed remote toggle bit */
u64 rc_proto; /* iMON or MCE (RC6) IR protocol? */
bool release_code; /* some keys send a release code */
u8 display_type; /* store the display type */
bool pad_mouse; /* toggle kbd(0)/mouse(1) mode */
char name_rdev[128]; /* rc input device name */
char phys_rdev[64]; /* rc input device phys path */
char name_idev[128]; /* input device name */
char phys_idev[64]; /* input device phys path */
char name_touch[128]; /* touch screen name */
char phys_touch[64]; /* touch screen phys path */
struct timer_list ttimer; /* touch screen timer */
int touch_x; /* x coordinate on touchscreen */
int touch_y; /* y coordinate on touchscreen */
const struct imon_usb_dev_descr *dev_descr;
/* device description with key */
/* table for front panels */
/*
* Fields for deferring free_imon_context().
*
* Since reference to "struct imon_context" is stored into
* "struct file"->private_data, we need to remember
* how many file descriptors might access this "struct imon_context".
*/
refcount_t users;
/*
* Use a flag for telling display_open()/vfd_write()/lcd_write() that
* imon_disconnect() was already called.
*/
bool disconnected;
/*
* We need to wait for RCU grace period in order to allow
* display_open() to safely check ->disconnected and increment ->users.
*/
struct rcu_head rcu;
};
#define TOUCH_TIMEOUT (HZ/30)
/* vfd character device file operations */
static const struct file_operations vfd_fops = {
.owner = THIS_MODULE,
.open = display_open,
.write = vfd_write,
.release = display_close,
.llseek = noop_llseek,
};
/* lcd character device file operations */
static const struct file_operations lcd_fops = {
.owner = THIS_MODULE,
.open = display_open,
.write = lcd_write,
.release = display_close,
.llseek = noop_llseek,
};
enum {
IMON_DISPLAY_TYPE_AUTO = 0,
IMON_DISPLAY_TYPE_VFD = 1,
IMON_DISPLAY_TYPE_LCD = 2,
IMON_DISPLAY_TYPE_VGA = 3,
IMON_DISPLAY_TYPE_NONE = 4,
};
enum {
IMON_KEY_IMON = 0,
IMON_KEY_MCE = 1,
IMON_KEY_PANEL = 2,
};
static struct usb_class_driver imon_vfd_class = {
.name = DEVICE_NAME,
.fops = &vfd_fops,
.minor_base = DISPLAY_MINOR_BASE,
};
static struct usb_class_driver imon_lcd_class = {
.name = DEVICE_NAME,
.fops = &lcd_fops,
.minor_base = DISPLAY_MINOR_BASE,
};
/* imon receiver front panel/knob key table */
static const struct imon_usb_dev_descr imon_default_table = {
.flags = IMON_NO_FLAGS,
.key_table = {
{ 0x000000000f00ffeell, KEY_MEDIA }, /* Go */
{ 0x000000001200ffeell, KEY_UP },
{ 0x000000001300ffeell, KEY_DOWN },
{ 0x000000001400ffeell, KEY_LEFT },
{ 0x000000001500ffeell, KEY_RIGHT },
{ 0x000000001600ffeell, KEY_ENTER },
{ 0x000000001700ffeell, KEY_ESC },
{ 0x000000001f00ffeell, KEY_AUDIO },
{ 0x000000002000ffeell, KEY_VIDEO },
{ 0x000000002100ffeell, KEY_CAMERA },
{ 0x000000002700ffeell, KEY_DVD },
{ 0x000000002300ffeell, KEY_TV },
{ 0x000000002b00ffeell, KEY_EXIT },
{ 0x000000002c00ffeell, KEY_SELECT },
{ 0x000000002d00ffeell, KEY_MENU },
{ 0x000000000500ffeell, KEY_PREVIOUS },
{ 0x000000000700ffeell, KEY_REWIND },
{ 0x000000000400ffeell, KEY_STOP },
{ 0x000000003c00ffeell, KEY_PLAYPAUSE },
{ 0x000000000800ffeell, KEY_FASTFORWARD },
{ 0x000000000600ffeell, KEY_NEXT },
{ 0x000000010000ffeell, KEY_RIGHT },
{ 0x000001000000ffeell, KEY_LEFT },
{ 0x000000003d00ffeell, KEY_SELECT },
{ 0x000100000000ffeell, KEY_VOLUMEUP },
{ 0x010000000000ffeell, KEY_VOLUMEDOWN },
{ 0x000000000100ffeell, KEY_MUTE },
/* 0xffdc iMON MCE VFD */
{ 0x00010000ffffffeell, KEY_VOLUMEUP },
{ 0x01000000ffffffeell, KEY_VOLUMEDOWN },
{ 0x00000001ffffffeell, KEY_MUTE },
{ 0x0000000fffffffeell, KEY_MEDIA },
{ 0x00000012ffffffeell, KEY_UP },
{ 0x00000013ffffffeell, KEY_DOWN },
{ 0x00000014ffffffeell, KEY_LEFT },
{ 0x00000015ffffffeell, KEY_RIGHT },
{ 0x00000016ffffffeell, KEY_ENTER },
{ 0x00000017ffffffeell, KEY_ESC },
/* iMON Knob values */
{ 0x000100ffffffffeell, KEY_VOLUMEUP },
{ 0x010000ffffffffeell, KEY_VOLUMEDOWN },
{ 0x000008ffffffffeell, KEY_MUTE },
{ 0, KEY_RESERVED },
}
};
static const struct imon_usb_dev_descr imon_OEM_VFD = {
.flags = IMON_NEED_20MS_PKT_DELAY,
.key_table = {
{ 0x000000000f00ffeell, KEY_MEDIA }, /* Go */
{ 0x000000001200ffeell, KEY_UP },
{ 0x000000001300ffeell, KEY_DOWN },
{ 0x000000001400ffeell, KEY_LEFT },
{ 0x000000001500ffeell, KEY_RIGHT },
{ 0x000000001600ffeell, KEY_ENTER },
{ 0x000000001700ffeell, KEY_ESC },
{ 0x000000001f00ffeell, KEY_AUDIO },
{ 0x000000002b00ffeell, KEY_EXIT },
{ 0x000000002c00ffeell, KEY_SELECT },
{ 0x000000002d00ffeell, KEY_MENU },
{ 0x000000000500ffeell, KEY_PREVIOUS },
{ 0x000000000700ffeell, KEY_REWIND },
{ 0x000000000400ffeell, KEY_STOP },
{ 0x000000003c00ffeell, KEY_PLAYPAUSE },
{ 0x000000000800ffeell, KEY_FASTFORWARD },
{ 0x000000000600ffeell, KEY_NEXT },
{ 0x000000010000ffeell, KEY_RIGHT },
{ 0x000001000000ffeell, KEY_LEFT },
{ 0x000000003d00ffeell, KEY_SELECT },
{ 0x000100000000ffeell, KEY_VOLUMEUP },
{ 0x010000000000ffeell, KEY_VOLUMEDOWN },
{ 0x000000000100ffeell, KEY_MUTE },
/* 0xffdc iMON MCE VFD */
{ 0x00010000ffffffeell, KEY_VOLUMEUP },
{ 0x01000000ffffffeell, KEY_VOLUMEDOWN },
{ 0x00000001ffffffeell, KEY_MUTE },
{ 0x0000000fffffffeell, KEY_MEDIA },
{ 0x00000012ffffffeell, KEY_UP },
{ 0x00000013ffffffeell, KEY_DOWN },
{ 0x00000014ffffffeell, KEY_LEFT },
{ 0x00000015ffffffeell, KEY_RIGHT },
{ 0x00000016ffffffeell, KEY_ENTER },
{ 0x00000017ffffffeell, KEY_ESC },
/* iMON Knob values */
{ 0x000100ffffffffeell, KEY_VOLUMEUP },
{ 0x010000ffffffffeell, KEY_VOLUMEDOWN },
{ 0x000008ffffffffeell, KEY_MUTE },
{ 0, KEY_RESERVED },
}
};
/* imon receiver front panel/knob key table for DH102*/
static const struct imon_usb_dev_descr imon_DH102 = {
.flags = IMON_NO_FLAGS,
.key_table = {
{ 0x000100000000ffeell, KEY_VOLUMEUP },
{ 0x010000000000ffeell, KEY_VOLUMEDOWN },
{ 0x000000010000ffeell, KEY_MUTE },
{ 0x0000000f0000ffeell, KEY_MEDIA },
{ 0x000000120000ffeell, KEY_UP },
{ 0x000000130000ffeell, KEY_DOWN },
{ 0x000000140000ffeell, KEY_LEFT },
{ 0x000000150000ffeell, KEY_RIGHT },
{ 0x000000160000ffeell, KEY_ENTER },
{ 0x000000170000ffeell, KEY_ESC },
{ 0x0000002b0000ffeell, KEY_EXIT },
{ 0x0000002c0000ffeell, KEY_SELECT },
{ 0x0000002d0000ffeell, KEY_MENU },
{ 0, KEY_RESERVED }
}
};
/* imon ultrabay front panel key table */
static const struct imon_usb_dev_descr ultrabay_table = {
.flags = IMON_SUPPRESS_REPEATED_KEYS,
.key_table = {
{ 0x0000000f0000ffeell, KEY_MEDIA }, /* Go */
{ 0x000000000100ffeell, KEY_UP },
{ 0x000000000001ffeell, KEY_DOWN },
{ 0x000000160000ffeell, KEY_ENTER },
{ 0x0000001f0000ffeell, KEY_AUDIO }, /* Music */
{ 0x000000200000ffeell, KEY_VIDEO }, /* Movie */
{ 0x000000210000ffeell, KEY_CAMERA }, /* Photo */
{ 0x000000270000ffeell, KEY_DVD }, /* DVD */
{ 0x000000230000ffeell, KEY_TV }, /* TV */
{ 0x000000050000ffeell, KEY_PREVIOUS }, /* Previous */
{ 0x000000070000ffeell, KEY_REWIND },
{ 0x000000040000ffeell, KEY_STOP },
{ 0x000000020000ffeell, KEY_PLAYPAUSE },
{ 0x000000080000ffeell, KEY_FASTFORWARD },
{ 0x000000060000ffeell, KEY_NEXT }, /* Next */
{ 0x000100000000ffeell, KEY_VOLUMEUP },
{ 0x010000000000ffeell, KEY_VOLUMEDOWN },
{ 0x000000010000ffeell, KEY_MUTE },
{ 0, KEY_RESERVED },
}
};
/*
* USB Device ID for iMON USB Control Boards
*
* The Windows drivers contain 6 different inf files, more or less one for
* each new device until the 0x0034-0x0046 devices, which all use the same
* driver. Some of the devices in the 34-46 range haven't been definitively
* identified yet. Early devices have either a TriGem Computer, Inc. or a
* Samsung vendor ID (0x0aa8 and 0x04e8 respectively), while all later
* devices use the SoundGraph vendor ID (0x15c2). This driver only supports
* the ffdc and later devices, which do onboard decoding.
*/
static const struct usb_device_id imon_usb_id_table[] = {
/*
* Several devices with this same device ID, all use iMON_PAD.inf
* SoundGraph iMON PAD (IR & VFD)
* SoundGraph iMON PAD (IR & LCD)
* SoundGraph iMON Knob (IR only)
*/
{ USB_DEVICE(0x15c2, 0xffdc),
.driver_info = (unsigned long)&imon_default_table },
/*
* Newer devices, all driven by the latest iMON Windows driver, full
* list of device IDs extracted via 'strings Setup/data1.hdr |grep 15c2'
* Need user input to fill in details on unknown devices.
*/
/* SoundGraph iMON OEM Touch LCD (IR & 7" VGA LCD) */
{ USB_DEVICE(0x15c2, 0x0034),
.driver_info = (unsigned long)&imon_DH102 },
/* SoundGraph iMON OEM Touch LCD (IR & 4.3" VGA LCD) */
{ USB_DEVICE(0x15c2, 0x0035),
.driver_info = (unsigned long)&imon_default_table},
/* SoundGraph iMON OEM VFD (IR & VFD) */
{ USB_DEVICE(0x15c2, 0x0036),
.driver_info = (unsigned long)&imon_OEM_VFD },
/* device specifics unknown */
{ USB_DEVICE(0x15c2, 0x0037),
.driver_info = (unsigned long)&imon_default_table},
/* SoundGraph iMON OEM LCD (IR & LCD) */
{ USB_DEVICE(0x15c2, 0x0038),
.driver_info = (unsigned long)&imon_default_table},
/* SoundGraph iMON UltraBay (IR & LCD) */
{ USB_DEVICE(0x15c2, 0x0039),
.driver_info = (unsigned long)&imon_default_table},
/* device specifics unknown */
{ USB_DEVICE(0x15c2, 0x003a),
.driver_info = (unsigned long)&imon_default_table},
/* device specifics unknown */
{ USB_DEVICE(0x15c2, 0x003b),
.driver_info = (unsigned long)&imon_default_table},
/* SoundGraph iMON OEM Inside (IR only) */
{ USB_DEVICE(0x15c2, 0x003c),
.driver_info = (unsigned long)&imon_default_table},
/* device specifics unknown */
{ USB_DEVICE(0x15c2, 0x003d),
.driver_info = (unsigned long)&imon_default_table},
/* device specifics unknown */
{ USB_DEVICE(0x15c2, 0x003e),
.driver_info = (unsigned long)&imon_default_table},
/* device specifics unknown */
{ USB_DEVICE(0x15c2, 0x003f),
.driver_info = (unsigned long)&imon_default_table},
/* device specifics unknown */
{ USB_DEVICE(0x15c2, 0x0040),
.driver_info = (unsigned long)&imon_default_table},
/* SoundGraph iMON MINI (IR only) */
{ USB_DEVICE(0x15c2, 0x0041),
.driver_info = (unsigned long)&imon_default_table},
/* Antec Veris Multimedia Station EZ External (IR only) */
{ USB_DEVICE(0x15c2, 0x0042),
.driver_info = (unsigned long)&imon_default_table},
/* Antec Veris Multimedia Station Basic Internal (IR only) */
{ USB_DEVICE(0x15c2, 0x0043),
.driver_info = (unsigned long)&imon_default_table},
/* Antec Veris Multimedia Station Elite (IR & VFD) */
{ USB_DEVICE(0x15c2, 0x0044),
.driver_info = (unsigned long)&imon_default_table},
/* Antec Veris Multimedia Station Premiere (IR & LCD) */
{ USB_DEVICE(0x15c2, 0x0045),
.driver_info = (unsigned long)&imon_default_table},
/* device specifics unknown */
{ USB_DEVICE(0x15c2, 0x0046),
.driver_info = (unsigned long)&imon_default_table},
{}
};
/* USB Device data */
static struct usb_driver imon_driver = {
.name = MOD_NAME,
.probe = imon_probe,
.disconnect = imon_disconnect,
.suspend = imon_suspend,
.resume = imon_resume,
.id_table = imon_usb_id_table,
};
/* Module bookkeeping bits */
MODULE_AUTHOR(MOD_AUTHOR);
MODULE_DESCRIPTION(MOD_DESC);
MODULE_VERSION(MOD_VERSION);
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(usb, imon_usb_id_table);
static bool debug;
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes (default: no)");
/* lcd, vfd, vga or none? should be auto-detected, but can be overridden... */
static int display_type;
module_param(display_type, int, S_IRUGO);
MODULE_PARM_DESC(display_type, "Type of attached display. 0=autodetect, 1=vfd, 2=lcd, 3=vga, 4=none (default: autodetect)");
static int pad_stabilize = 1;
module_param(pad_stabilize, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(pad_stabilize, "Apply stabilization algorithm to iMON PAD presses in arrow key mode. 0=disable, 1=enable (default).");
/*
* In certain use cases, mouse mode isn't really helpful, and could actually
* cause confusion, so allow disabling it when the IR device is open.
*/
static bool nomouse;
module_param(nomouse, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(nomouse, "Disable mouse input device mode when IR device is open. 0=don't disable, 1=disable. (default: don't disable)");
/* threshold at which a pad push registers as an arrow key in kbd mode */
static int pad_thresh;
module_param(pad_thresh, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(pad_thresh, "Threshold at which a pad push registers as an arrow key in kbd mode (default: 28)");
static void free_imon_context(struct imon_context *ictx)
{
struct device *dev = ictx->dev;
usb_free_urb(ictx->tx_urb);
WARN_ON(ictx->dev_present_intf0);
usb_free_urb(ictx->rx_urb_intf0);
WARN_ON(ictx->dev_present_intf1);
usb_free_urb(ictx->rx_urb_intf1);
kfree_rcu(ictx, rcu);
dev_dbg(dev, "%s: iMON context freed\n", __func__);
}
/*
* Called when the Display device (e.g. /dev/lcd0)
* is opened by the application.
*/
static int display_open(struct inode *inode, struct file *file)
{
struct usb_interface *interface;
struct imon_context *ictx = NULL;
int subminor;
int retval = 0;
subminor = iminor(inode);
interface = usb_find_interface(&imon_driver, subminor);
if (!interface) {
pr_err("could not find interface for minor %d\n", subminor);
retval = -ENODEV;
goto exit;
}
rcu_read_lock();
ictx = usb_get_intfdata(interface);
if (!ictx || ictx->disconnected || !refcount_inc_not_zero(&ictx->users)) {
rcu_read_unlock();
pr_err("no context found for minor %d\n", subminor);
retval = -ENODEV;
goto exit;
}
rcu_read_unlock();
mutex_lock(&ictx->lock);
if (!ictx->display_supported) {
pr_err("display not supported by device\n");
retval = -ENODEV;
} else if (ictx->display_isopen) {
pr_err("display port is already open\n");
retval = -EBUSY;
} else {
ictx->display_isopen = true;
file->private_data = ictx;
dev_dbg(ictx->dev, "display port opened\n");
}
mutex_unlock(&ictx->lock);
if (retval && refcount_dec_and_test(&ictx->users))
free_imon_context(ictx);
exit:
return retval;
}
/*
* Called when the display device (e.g. /dev/lcd0)
* is closed by the application.
*/
static int display_close(struct inode *inode, struct file *file)
{
struct imon_context *ictx = file->private_data;
int retval = 0;
mutex_lock(&ictx->lock);
if (!ictx->display_supported) {
pr_err("display not supported by device\n");
retval = -ENODEV;
} else if (!ictx->display_isopen) {
pr_err("display is not open\n");
retval = -EIO;
} else {
ictx->display_isopen = false;
dev_dbg(ictx->dev, "display port closed\n");
}
mutex_unlock(&ictx->lock);
if (refcount_dec_and_test(&ictx->users))
free_imon_context(ictx);
return retval;
}
/*
* Sends a packet to the device -- this function must be called with
* ictx->lock held, or its unlock/lock sequence while waiting for tx
* to complete can/will lead to a deadlock.
*/
static int send_packet(struct imon_context *ictx)
{
unsigned int pipe;
unsigned long timeout;
int interval = 0;
int retval = 0;
struct usb_ctrlrequest *control_req = NULL;
/* Check if we need to use control or interrupt urb */
if (!ictx->tx_control) {
pipe = usb_sndintpipe(ictx->usbdev_intf0,
ictx->tx_endpoint->bEndpointAddress);
interval = ictx->tx_endpoint->bInterval;
usb_fill_int_urb(ictx->tx_urb, ictx->usbdev_intf0, pipe,
ictx->usb_tx_buf,
sizeof(ictx->usb_tx_buf),
usb_tx_callback, ictx, interval);
ictx->tx_urb->actual_length = 0;
} else {
/* fill request into kmalloc'ed space: */
control_req = kmalloc(sizeof(*control_req), GFP_KERNEL);
if (control_req == NULL)
return -ENOMEM;
/* setup packet is '21 09 0200 0001 0008' */
control_req->bRequestType = 0x21;
control_req->bRequest = 0x09;
control_req->wValue = cpu_to_le16(0x0200);
control_req->wIndex = cpu_to_le16(0x0001);
control_req->wLength = cpu_to_le16(0x0008);
/* control pipe is endpoint 0x00 */
pipe = usb_sndctrlpipe(ictx->usbdev_intf0, 0);
/* build the control urb */
usb_fill_control_urb(ictx->tx_urb, ictx->usbdev_intf0,
pipe, (unsigned char *)control_req,
ictx->usb_tx_buf,
sizeof(ictx->usb_tx_buf),
usb_tx_callback, ictx);
ictx->tx_urb->actual_length = 0;
}
reinit_completion(&ictx->tx.finished);
ictx->tx.busy = true;
smp_rmb(); /* ensure later readers know we're busy */
retval = usb_submit_urb(ictx->tx_urb, GFP_KERNEL);
if (retval) {
ictx->tx.busy = false;
smp_rmb(); /* ensure later readers know we're not busy */
pr_err_ratelimited("error submitting urb(%d)\n", retval);
} else {
/* Wait for transmission to complete (or abort) */
mutex_unlock(&ictx->lock);
retval = wait_for_completion_interruptible(
&ictx->tx.finished);
if (retval) {
usb_kill_urb(ictx->tx_urb);
pr_err_ratelimited("task interrupted\n");
}
mutex_lock(&ictx->lock);
retval = ictx->tx.status;
if (retval)
pr_err_ratelimited("packet tx failed (%d)\n", retval);
}
kfree(control_req);
/*
* Induce a mandatory delay before returning, as otherwise,
* send_packet can get called so rapidly as to overwhelm the device,
* particularly on faster systems and/or those with quirky usb.
*/
timeout = msecs_to_jiffies(ictx->send_packet_delay);
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(timeout);
return retval;
}
/*
* Sends an associate packet to the iMON 2.4G.
*
* This might not be such a good idea, since it has an id collision with
* some versions of the "IR & VFD" combo. The only way to determine if it
* is an RF version is to look at the product description string. (Which
* we currently do not fetch).
*/
static int send_associate_24g(struct imon_context *ictx)
{
int retval;
const unsigned char packet[8] = { 0x01, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x20 };
if (!ictx) {
pr_err("no context for device\n");
return -ENODEV;
}
if (!ictx->dev_present_intf0) {
pr_err("no iMON device present\n");
return -ENODEV;
}
memcpy(ictx->usb_tx_buf, packet, sizeof(packet));
retval = send_packet(ictx);
return retval;
}
/*
* Sends packets to setup and show clock on iMON display
*
* Arguments: year - last 2 digits of year, month - 1..12,
* day - 1..31, dow - day of the week (0-Sun...6-Sat),
* hour - 0..23, minute - 0..59, second - 0..59
*/
static int send_set_imon_clock(struct imon_context *ictx,
unsigned int year, unsigned int month,
unsigned int day, unsigned int dow,
unsigned int hour, unsigned int minute,
unsigned int second)
{
unsigned char clock_enable_pkt[IMON_CLOCK_ENABLE_PACKETS][8];
int retval = 0;
int i;
if (!ictx) {
pr_err("no context for device\n");
return -ENODEV;
}
switch (ictx->display_type) {
case IMON_DISPLAY_TYPE_LCD:
clock_enable_pkt[0][0] = 0x80;
clock_enable_pkt[0][1] = year;
clock_enable_pkt[0][2] = month-1;
clock_enable_pkt[0][3] = day;
clock_enable_pkt[0][4] = hour;
clock_enable_pkt[0][5] = minute;
clock_enable_pkt[0][6] = second;
clock_enable_pkt[1][0] = 0x80;
clock_enable_pkt[1][1] = 0;
clock_enable_pkt[1][2] = 0;
clock_enable_pkt[1][3] = 0;
clock_enable_pkt[1][4] = 0;
clock_enable_pkt[1][5] = 0;
clock_enable_pkt[1][6] = 0;
if (ictx->product == 0xffdc) {
clock_enable_pkt[0][7] = 0x50;
clock_enable_pkt[1][7] = 0x51;
} else {
clock_enable_pkt[0][7] = 0x88;
clock_enable_pkt[1][7] = 0x8a;
}
break;
case IMON_DISPLAY_TYPE_VFD:
clock_enable_pkt[0][0] = year;
clock_enable_pkt[0][1] = month-1;
clock_enable_pkt[0][2] = day;
clock_enable_pkt[0][3] = dow;
clock_enable_pkt[0][4] = hour;
clock_enable_pkt[0][5] = minute;
clock_enable_pkt[0][6] = second;
clock_enable_pkt[0][7] = 0x40;
clock_enable_pkt[1][0] = 0;
clock_enable_pkt[1][1] = 0;
clock_enable_pkt[1][2] = 1;
clock_enable_pkt[1][3] = 0;
clock_enable_pkt[1][4] = 0;
clock_enable_pkt[1][5] = 0;
clock_enable_pkt[1][6] = 0;
clock_enable_pkt[1][7] = 0x42;
break;
default:
return -ENODEV;
}
for (i = 0; i < IMON_CLOCK_ENABLE_PACKETS; i++) {
memcpy(ictx->usb_tx_buf, clock_enable_pkt[i], 8);
retval = send_packet(ictx);
if (retval) {
pr_err("send_packet failed for packet %d\n", i);
break;
}
}
return retval;
}
/*
* These are the sysfs functions to handle the association on the iMON 2.4G LT.
*/
static ssize_t associate_remote_show(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct imon_context *ictx = dev_get_drvdata(d);
if (!ictx)
return -ENODEV;
mutex_lock(&ictx->lock);
if (ictx->rf_isassociating)
strscpy(buf, "associating\n", PAGE_SIZE);
else
strscpy(buf, "closed\n", PAGE_SIZE);
dev_info(d, "Visit https://www.lirc.org/html/imon-24g.html for instructions on how to associate your iMON 2.4G DT/LT remote\n");
mutex_unlock(&ictx->lock);
return strlen(buf);
}
static ssize_t associate_remote_store(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct imon_context *ictx;
ictx = dev_get_drvdata(d);
if (!ictx)
return -ENODEV;
mutex_lock(&ictx->lock);
ictx->rf_isassociating = true;
send_associate_24g(ictx);
mutex_unlock(&ictx->lock);
return count;
}
/*
* sysfs functions to control internal imon clock
*/
static ssize_t imon_clock_show(struct device *d,
struct device_attribute *attr, char *buf)
{
struct imon_context *ictx = dev_get_drvdata(d);
size_t len;
if (!ictx)
return -ENODEV;
mutex_lock(&ictx->lock);
if (!ictx->display_supported) {
len = snprintf(buf, PAGE_SIZE, "Not supported.");
} else {
len = snprintf(buf, PAGE_SIZE,
"To set the clock on your iMON display:\n"
"# date \"+%%y %%m %%d %%w %%H %%M %%S\" > imon_clock\n"
"%s", ictx->display_isopen ?
"\nNOTE: imon device must be closed\n" : "");
}
mutex_unlock(&ictx->lock);
return len;
}
static ssize_t imon_clock_store(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct imon_context *ictx = dev_get_drvdata(d);
ssize_t retval;
unsigned int year, month, day, dow, hour, minute, second;
if (!ictx)
return -ENODEV;
mutex_lock(&ictx->lock);
if (!ictx->display_supported) {
retval = -ENODEV;
goto exit;
} else if (ictx->display_isopen) {
retval = -EBUSY;
goto exit;
}
if (sscanf(buf, "%u %u %u %u %u %u %u", &year, &month, &day, &dow,
&hour, &minute, &second) != 7) {
retval = -EINVAL;
goto exit;
}
if ((month < 1 || month > 12) ||
(day < 1 || day > 31) || (dow > 6) ||
(hour > 23) || (minute > 59) || (second > 59)) {
retval = -EINVAL;
goto exit;
}
retval = send_set_imon_clock(ictx, year, month, day, dow,
hour, minute, second);
if (retval)
goto exit;
retval = count;
exit:
mutex_unlock(&ictx->lock);
return retval;
}
static DEVICE_ATTR_RW(imon_clock);
static DEVICE_ATTR_RW(associate_remote);
static struct attribute *imon_display_sysfs_entries[] = {
&dev_attr_imon_clock.attr,
NULL
};
static const struct attribute_group imon_display_attr_group = {
.attrs = imon_display_sysfs_entries
};
static struct attribute *imon_rf_sysfs_entries[] = {
&dev_attr_associate_remote.attr,
NULL
};
static const struct attribute_group imon_rf_attr_group = {
.attrs = imon_rf_sysfs_entries
};
/*
* Writes data to the VFD. The iMON VFD is 2x16 characters
* and requires data in 5 consecutive USB interrupt packets,
* each packet but the last carrying 7 bytes.
*
* I don't know if the VFD board supports features such as
* scrolling, clearing rows, blanking, etc. so at
* the caller must provide a full screen of data. If fewer
* than 32 bytes are provided spaces will be appended to
* generate a full screen.
*/
static ssize_t vfd_write(struct file *file, const char __user *buf,
size_t n_bytes, loff_t *pos)
{
int i;
int offset;
int seq;
int retval = 0;
struct imon_context *ictx = file->private_data;
static const unsigned char vfd_packet6[] = {
0x01, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF };
if (ictx->disconnected)
return -ENODEV;
mutex_lock(&ictx->lock);
if (!ictx->dev_present_intf0) {
pr_err_ratelimited("no iMON device present\n");
retval = -ENODEV;
goto exit;
}
if (n_bytes <= 0 || n_bytes > 32) {
pr_err_ratelimited("invalid payload size\n");
retval = -EINVAL;
goto exit;
}
if (copy_from_user(ictx->tx.data_buf, buf, n_bytes)) {
retval = -EFAULT;
goto exit;
}
/* Pad with spaces */
for (i = n_bytes; i < 32; ++i)
ictx->tx.data_buf[i] = ' ';
for (i = 32; i < 35; ++i)
ictx->tx.data_buf[i] = 0xFF;
offset = 0;
seq = 0;
do {
memcpy(ictx->usb_tx_buf, ictx->tx.data_buf + offset, 7);
ictx->usb_tx_buf[7] = (unsigned char) seq;
retval = send_packet(ictx);
if (retval) {
pr_err_ratelimited("send packet #%d failed\n", seq / 2);
goto exit;
} else {
seq += 2;
offset += 7;
}
} while (offset < 35);