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-rw-r--r--drivers/char/keyboard.c325
-rw-r--r--drivers/char/sysrq.c243
2 files changed, 368 insertions, 200 deletions
diff --git a/drivers/char/keyboard.c b/drivers/char/keyboard.c
index ada25bb8941e..54109dc9240c 100644
--- a/drivers/char/keyboard.c
+++ b/drivers/char/keyboard.c
@@ -24,6 +24,8 @@
* 21-08-02: Converted to input API, major cleanup. (Vojtech Pavlik)
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/consolemap.h>
#include <linux/module.h>
#include <linux/sched.h>
@@ -38,7 +40,6 @@
#include <linux/kbd_kern.h>
#include <linux/kbd_diacr.h>
#include <linux/vt_kern.h>
-#include <linux/sysrq.h>
#include <linux/input.h>
#include <linux/reboot.h>
#include <linux/notifier.h>
@@ -82,8 +83,7 @@ void compute_shiftstate(void);
typedef void (k_handler_fn)(struct vc_data *vc, unsigned char value,
char up_flag);
static k_handler_fn K_HANDLERS;
-k_handler_fn *k_handler[16] = { K_HANDLERS };
-EXPORT_SYMBOL_GPL(k_handler);
+static k_handler_fn *k_handler[16] = { K_HANDLERS };
#define FN_HANDLERS\
fn_null, fn_enter, fn_show_ptregs, fn_show_mem,\
@@ -133,7 +133,7 @@ static struct input_handler kbd_handler;
static DEFINE_SPINLOCK(kbd_event_lock);
static unsigned long key_down[BITS_TO_LONGS(KEY_CNT)]; /* keyboard key bitmap */
static unsigned char shift_down[NR_SHIFT]; /* shift state counters.. */
-static int dead_key_next;
+static bool dead_key_next;
static int npadch = -1; /* -1 or number assembled on pad */
static unsigned int diacr;
static char rep; /* flag telling character repeat */
@@ -147,22 +147,6 @@ static struct ledptr {
unsigned char valid:1;
} ledptrs[3];
-/* Simple translation table for the SysRq keys */
-
-#ifdef CONFIG_MAGIC_SYSRQ
-unsigned char kbd_sysrq_xlate[KEY_MAX + 1] =
- "\000\0331234567890-=\177\t" /* 0x00 - 0x0f */
- "qwertyuiop[]\r\000as" /* 0x10 - 0x1f */
- "dfghjkl;'`\000\\zxcv" /* 0x20 - 0x2f */
- "bnm,./\000*\000 \000\201\202\203\204\205" /* 0x30 - 0x3f */
- "\206\207\210\211\212\000\000789-456+1" /* 0x40 - 0x4f */
- "230\177\000\000\213\214\000\000\000\000\000\000\000\000\000\000" /* 0x50 - 0x5f */
- "\r\000/"; /* 0x60 - 0x6f */
-static int sysrq_down;
-static int sysrq_alt_use;
-#endif
-static int sysrq_alt;
-
/*
* Notifier list for console keyboard events
*/
@@ -361,8 +345,8 @@ static void to_utf8(struct vc_data *vc, uint c)
/* 110***** 10****** */
put_queue(vc, 0xc0 | (c >> 6));
put_queue(vc, 0x80 | (c & 0x3f));
- } else if (c < 0x10000) {
- if (c >= 0xD800 && c < 0xE000)
+ } else if (c < 0x10000) {
+ if (c >= 0xD800 && c < 0xE000)
return;
if (c == 0xFFFF)
return;
@@ -370,7 +354,7 @@ static void to_utf8(struct vc_data *vc, uint c)
put_queue(vc, 0xe0 | (c >> 12));
put_queue(vc, 0x80 | ((c >> 6) & 0x3f));
put_queue(vc, 0x80 | (c & 0x3f));
- } else if (c < 0x110000) {
+ } else if (c < 0x110000) {
/* 11110*** 10****** 10****** 10****** */
put_queue(vc, 0xf0 | (c >> 18));
put_queue(vc, 0x80 | ((c >> 12) & 0x3f));
@@ -469,6 +453,7 @@ static void fn_enter(struct vc_data *vc)
}
diacr = 0;
}
+
put_queue(vc, 13);
if (vc_kbd_mode(kbd, VC_CRLF))
put_queue(vc, 10);
@@ -478,6 +463,7 @@ static void fn_caps_toggle(struct vc_data *vc)
{
if (rep)
return;
+
chg_vc_kbd_led(kbd, VC_CAPSLOCK);
}
@@ -485,12 +471,14 @@ static void fn_caps_on(struct vc_data *vc)
{
if (rep)
return;
+
set_vc_kbd_led(kbd, VC_CAPSLOCK);
}
static void fn_show_ptregs(struct vc_data *vc)
{
struct pt_regs *regs = get_irq_regs();
+
if (regs)
show_regs(regs);
}
@@ -515,7 +503,7 @@ static void fn_hold(struct vc_data *vc)
static void fn_num(struct vc_data *vc)
{
- if (vc_kbd_mode(kbd,VC_APPLIC))
+ if (vc_kbd_mode(kbd, VC_APPLIC))
applkey(vc, 'P', 1);
else
fn_bare_num(vc);
@@ -610,7 +598,7 @@ static void fn_boot_it(struct vc_data *vc)
static void fn_compose(struct vc_data *vc)
{
- dead_key_next = 1;
+ dead_key_next = true;
}
static void fn_spawn_con(struct vc_data *vc)
@@ -657,7 +645,7 @@ static void k_spec(struct vc_data *vc, unsigned char value, char up_flag)
static void k_lowercase(struct vc_data *vc, unsigned char value, char up_flag)
{
- printk(KERN_ERR "keyboard.c: k_lowercase was called - impossible\n");
+ pr_err("k_lowercase was called - impossible\n");
}
static void k_unicode(struct vc_data *vc, unsigned int value, char up_flag)
@@ -669,7 +657,7 @@ static void k_unicode(struct vc_data *vc, unsigned int value, char up_flag)
value = handle_diacr(vc, value);
if (dead_key_next) {
- dead_key_next = 0;
+ dead_key_next = false;
diacr = value;
return;
}
@@ -691,6 +679,7 @@ static void k_deadunicode(struct vc_data *vc, unsigned int value, char up_flag)
{
if (up_flag)
return;
+
diacr = (diacr ? handle_diacr(vc, value) : value);
}
@@ -710,29 +699,28 @@ static void k_dead2(struct vc_data *vc, unsigned char value, char up_flag)
static void k_dead(struct vc_data *vc, unsigned char value, char up_flag)
{
static const unsigned char ret_diacr[NR_DEAD] = {'`', '\'', '^', '~', '"', ',' };
- value = ret_diacr[value];
- k_deadunicode(vc, value, up_flag);
+
+ k_deadunicode(vc, ret_diacr[value], up_flag);
}
static void k_cons(struct vc_data *vc, unsigned char value, char up_flag)
{
if (up_flag)
return;
+
set_console(value);
}
static void k_fn(struct vc_data *vc, unsigned char value, char up_flag)
{
- unsigned v;
-
if (up_flag)
return;
- v = value;
- if (v < ARRAY_SIZE(func_table)) {
+
+ if ((unsigned)value < ARRAY_SIZE(func_table)) {
if (func_table[value])
puts_queue(vc, func_table[value]);
} else
- printk(KERN_ERR "k_fn called with value=%d\n", value);
+ pr_err("k_fn called with value=%d\n", value);
}
static void k_cur(struct vc_data *vc, unsigned char value, char up_flag)
@@ -741,6 +729,7 @@ static void k_cur(struct vc_data *vc, unsigned char value, char up_flag)
if (up_flag)
return;
+
applkey(vc, cur_chars[value], vc_kbd_mode(kbd, VC_CKMODE));
}
@@ -758,43 +747,45 @@ static void k_pad(struct vc_data *vc, unsigned char value, char up_flag)
return;
}
- if (!vc_kbd_led(kbd, VC_NUMLOCK))
+ if (!vc_kbd_led(kbd, VC_NUMLOCK)) {
+
switch (value) {
- case KVAL(K_PCOMMA):
- case KVAL(K_PDOT):
- k_fn(vc, KVAL(K_REMOVE), 0);
- return;
- case KVAL(K_P0):
- k_fn(vc, KVAL(K_INSERT), 0);
- return;
- case KVAL(K_P1):
- k_fn(vc, KVAL(K_SELECT), 0);
- return;
- case KVAL(K_P2):
- k_cur(vc, KVAL(K_DOWN), 0);
- return;
- case KVAL(K_P3):
- k_fn(vc, KVAL(K_PGDN), 0);
- return;
- case KVAL(K_P4):
- k_cur(vc, KVAL(K_LEFT), 0);
- return;
- case KVAL(K_P6):
- k_cur(vc, KVAL(K_RIGHT), 0);
- return;
- case KVAL(K_P7):
- k_fn(vc, KVAL(K_FIND), 0);
- return;
- case KVAL(K_P8):
- k_cur(vc, KVAL(K_UP), 0);
- return;
- case KVAL(K_P9):
- k_fn(vc, KVAL(K_PGUP), 0);
- return;
- case KVAL(K_P5):
- applkey(vc, 'G', vc_kbd_mode(kbd, VC_APPLIC));
- return;
+ case KVAL(K_PCOMMA):
+ case KVAL(K_PDOT):
+ k_fn(vc, KVAL(K_REMOVE), 0);
+ return;
+ case KVAL(K_P0):
+ k_fn(vc, KVAL(K_INSERT), 0);
+ return;
+ case KVAL(K_P1):
+ k_fn(vc, KVAL(K_SELECT), 0);
+ return;
+ case KVAL(K_P2):
+ k_cur(vc, KVAL(K_DOWN), 0);
+ return;
+ case KVAL(K_P3):
+ k_fn(vc, KVAL(K_PGDN), 0);
+ return;
+ case KVAL(K_P4):
+ k_cur(vc, KVAL(K_LEFT), 0);
+ return;
+ case KVAL(K_P6):
+ k_cur(vc, KVAL(K_RIGHT), 0);
+ return;
+ case KVAL(K_P7):
+ k_fn(vc, KVAL(K_FIND), 0);
+ return;
+ case KVAL(K_P8):
+ k_cur(vc, KVAL(K_UP), 0);
+ return;
+ case KVAL(K_P9):
+ k_fn(vc, KVAL(K_PGUP), 0);
+ return;
+ case KVAL(K_P5):
+ applkey(vc, 'G', vc_kbd_mode(kbd, VC_APPLIC));
+ return;
}
+ }
put_queue(vc, pad_chars[value]);
if (value == KVAL(K_PENTER) && vc_kbd_mode(kbd, VC_CRLF))
@@ -880,6 +871,7 @@ static void k_lock(struct vc_data *vc, unsigned char value, char up_flag)
{
if (up_flag || rep)
return;
+
chg_vc_kbd_lock(kbd, value);
}
@@ -888,6 +880,7 @@ static void k_slock(struct vc_data *vc, unsigned char value, char up_flag)
k_shift(vc, value, up_flag);
if (up_flag || rep)
return;
+
chg_vc_kbd_slock(kbd, value);
/* try to make Alt, oops, AltGr and such work */
if (!key_maps[kbd->lockstate ^ kbd->slockstate]) {
@@ -925,12 +918,12 @@ static void k_brlcommit(struct vc_data *vc, unsigned int pattern, char up_flag)
static void k_brl(struct vc_data *vc, unsigned char value, char up_flag)
{
- static unsigned pressed,committing;
+ static unsigned pressed, committing;
static unsigned long releasestart;
if (kbd->kbdmode != VC_UNICODE) {
if (!up_flag)
- printk("keyboard mode must be unicode for braille patterns\n");
+ pr_warning("keyboard mode must be unicode for braille patterns\n");
return;
}
@@ -942,32 +935,28 @@ static void k_brl(struct vc_data *vc, unsigned char value, char up_flag)
if (value > 8)
return;
- if (up_flag) {
- if (brl_timeout) {
- if (!committing ||
- time_after(jiffies,
- releasestart + msecs_to_jiffies(brl_timeout))) {
- committing = pressed;
- releasestart = jiffies;
- }
- pressed &= ~(1 << (value - 1));
- if (!pressed) {
- if (committing) {
- k_brlcommit(vc, committing, 0);
- committing = 0;
- }
- }
- } else {
- if (committing) {
- k_brlcommit(vc, committing, 0);
- committing = 0;
- }
- pressed &= ~(1 << (value - 1));
- }
- } else {
+ if (!up_flag) {
pressed |= 1 << (value - 1);
if (!brl_timeout)
committing = pressed;
+ } else if (brl_timeout) {
+ if (!committing ||
+ time_after(jiffies,
+ releasestart + msecs_to_jiffies(brl_timeout))) {
+ committing = pressed;
+ releasestart = jiffies;
+ }
+ pressed &= ~(1 << (value - 1));
+ if (!pressed && committing) {
+ k_brlcommit(vc, committing, 0);
+ committing = 0;
+ }
+ } else {
+ if (committing) {
+ k_brlcommit(vc, committing, 0);
+ committing = 0;
+ }
+ pressed &= ~(1 << (value - 1));
}
}
@@ -988,6 +977,7 @@ void setledstate(struct kbd_struct *kbd, unsigned int led)
kbd->ledmode = LED_SHOW_IOCTL;
} else
kbd->ledmode = LED_SHOW_FLAGS;
+
set_leds();
}
@@ -1075,7 +1065,7 @@ static const unsigned short x86_keycodes[256] =
332,340,365,342,343,344,345,346,356,270,341,368,369,370,371,372 };
#ifdef CONFIG_SPARC
-static int sparc_l1_a_state = 0;
+static int sparc_l1_a_state;
extern void sun_do_break(void);
#endif
@@ -1085,52 +1075,54 @@ static int emulate_raw(struct vc_data *vc, unsigned int keycode,
int code;
switch (keycode) {
- case KEY_PAUSE:
- put_queue(vc, 0xe1);
- put_queue(vc, 0x1d | up_flag);
- put_queue(vc, 0x45 | up_flag);
- break;
- case KEY_HANGEUL:
- if (!up_flag)
- put_queue(vc, 0xf2);
- break;
+ case KEY_PAUSE:
+ put_queue(vc, 0xe1);
+ put_queue(vc, 0x1d | up_flag);
+ put_queue(vc, 0x45 | up_flag);
+ break;
- case KEY_HANJA:
- if (!up_flag)
- put_queue(vc, 0xf1);
- break;
+ case KEY_HANGEUL:
+ if (!up_flag)
+ put_queue(vc, 0xf2);
+ break;
- case KEY_SYSRQ:
- /*
- * Real AT keyboards (that's what we're trying
- * to emulate here emit 0xe0 0x2a 0xe0 0x37 when
- * pressing PrtSc/SysRq alone, but simply 0x54
- * when pressing Alt+PrtSc/SysRq.
- */
- if (sysrq_alt) {
- put_queue(vc, 0x54 | up_flag);
- } else {
- put_queue(vc, 0xe0);
- put_queue(vc, 0x2a | up_flag);
- put_queue(vc, 0xe0);
- put_queue(vc, 0x37 | up_flag);
- }
- break;
+ case KEY_HANJA:
+ if (!up_flag)
+ put_queue(vc, 0xf1);
+ break;
- default:
- if (keycode > 255)
- return -1;
+ case KEY_SYSRQ:
+ /*
+ * Real AT keyboards (that's what we're trying
+ * to emulate here emit 0xe0 0x2a 0xe0 0x37 when
+ * pressing PrtSc/SysRq alone, but simply 0x54
+ * when pressing Alt+PrtSc/SysRq.
+ */
+ if (test_bit(KEY_LEFTALT, key_down) ||
+ test_bit(KEY_RIGHTALT, key_down)) {
+ put_queue(vc, 0x54 | up_flag);
+ } else {
+ put_queue(vc, 0xe0);
+ put_queue(vc, 0x2a | up_flag);
+ put_queue(vc, 0xe0);
+ put_queue(vc, 0x37 | up_flag);
+ }
+ break;
- code = x86_keycodes[keycode];
- if (!code)
- return -1;
+ default:
+ if (keycode > 255)
+ return -1;
- if (code & 0x100)
- put_queue(vc, 0xe0);
- put_queue(vc, (code & 0x7f) | up_flag);
+ code = x86_keycodes[keycode];
+ if (!code)
+ return -1;
- break;
+ if (code & 0x100)
+ put_queue(vc, 0xe0);
+ put_queue(vc, (code & 0x7f) | up_flag);
+
+ break;
}
return 0;
@@ -1153,6 +1145,7 @@ static int emulate_raw(struct vc_data *vc, unsigned int keycode, unsigned char u
static void kbd_rawcode(unsigned char data)
{
struct vc_data *vc = vc_cons[fg_console].d;
+
kbd = kbd_table + vc->vc_num;
if (kbd->kbdmode == VC_RAW)
put_queue(vc, data);
@@ -1162,10 +1155,12 @@ static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
{
struct vc_data *vc = vc_cons[fg_console].d;
unsigned short keysym, *key_map;
- unsigned char type, raw_mode;
+ unsigned char type;
+ bool raw_mode;
struct tty_struct *tty;
int shift_final;
struct keyboard_notifier_param param = { .vc = vc, .value = keycode, .down = down };
+ int rc;
tty = vc->vc_tty;
@@ -1176,8 +1171,6 @@ static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
kbd = kbd_table + vc->vc_num;
- if (keycode == KEY_LEFTALT || keycode == KEY_RIGHTALT)
- sysrq_alt = down ? keycode : 0;
#ifdef CONFIG_SPARC
if (keycode == KEY_STOP)
sparc_l1_a_state = down;
@@ -1185,29 +1178,16 @@ static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
rep = (down == 2);
- if ((raw_mode = (kbd->kbdmode == VC_RAW)) && !hw_raw)
+ raw_mode = (kbd->kbdmode == VC_RAW);
+ if (raw_mode && !hw_raw)
if (emulate_raw(vc, keycode, !down << 7))
if (keycode < BTN_MISC && printk_ratelimit())
- printk(KERN_WARNING "keyboard.c: can't emulate rawmode for keycode %d\n", keycode);
+ pr_warning("can't emulate rawmode for keycode %d\n",
+ keycode);
-#ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */
- if (keycode == KEY_SYSRQ && (sysrq_down || (down == 1 && sysrq_alt))) {
- if (!sysrq_down) {
- sysrq_down = down;
- sysrq_alt_use = sysrq_alt;
- }
- return;
- }
- if (sysrq_down && !down && keycode == sysrq_alt_use)
- sysrq_down = 0;
- if (sysrq_down && down && !rep) {
- handle_sysrq(kbd_sysrq_xlate[keycode], tty);
- return;
- }
-#endif
#ifdef CONFIG_SPARC
if (keycode == KEY_A && sparc_l1_a_state) {
- sparc_l1_a_state = 0;
+ sparc_l1_a_state = false;
sun_do_break();
}
#endif
@@ -1229,7 +1209,7 @@ static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
put_queue(vc, (keycode >> 7) | 0x80);
put_queue(vc, keycode | 0x80);
}
- raw_mode = 1;
+ raw_mode = true;
}
if (down)
@@ -1252,29 +1232,32 @@ static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
param.ledstate = kbd->ledflagstate;
key_map = key_maps[shift_final];
- if (atomic_notifier_call_chain(&keyboard_notifier_list, KBD_KEYCODE, &param) == NOTIFY_STOP || !key_map) {
- atomic_notifier_call_chain(&keyboard_notifier_list, KBD_UNBOUND_KEYCODE, &param);
+ rc = atomic_notifier_call_chain(&keyboard_notifier_list,
+ KBD_KEYCODE, &param);
+ if (rc == NOTIFY_STOP || !key_map) {
+ atomic_notifier_call_chain(&keyboard_notifier_list,
+ KBD_UNBOUND_KEYCODE, &param);
compute_shiftstate();
kbd->slockstate = 0;
return;
}
- if (keycode >= NR_KEYS)
- if (keycode >= KEY_BRL_DOT1 && keycode <= KEY_BRL_DOT8)
- keysym = U(K(KT_BRL, keycode - KEY_BRL_DOT1 + 1));
- else
- return;
- else
+ if (keycode < NR_KEYS)
keysym = key_map[keycode];
+ else if (keycode >= KEY_BRL_DOT1 && keycode <= KEY_BRL_DOT8)
+ keysym = U(K(KT_BRL, keycode - KEY_BRL_DOT1 + 1));
+ else
+ return;
type = KTYP(keysym);
if (type < 0xf0) {
param.value = keysym;
- if (atomic_notifier_call_chain(&keyboard_notifier_list, KBD_UNICODE, &param) == NOTIFY_STOP)
- return;
- if (down && !raw_mode)
- to_utf8(vc, keysym);
+ rc = atomic_notifier_call_chain(&keyboard_notifier_list,
+ KBD_UNICODE, &param);
+ if (rc != NOTIFY_STOP)
+ if (down && !raw_mode)
+ to_utf8(vc, keysym);
return;
}
@@ -1288,9 +1271,11 @@ static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
keysym = key_map[keycode];
}
}
- param.value = keysym;
- if (atomic_notifier_call_chain(&keyboard_notifier_list, KBD_KEYSYM, &param) == NOTIFY_STOP)
+ param.value = keysym;
+ rc = atomic_notifier_call_chain(&keyboard_notifier_list,
+ KBD_KEYSYM, &param);
+ if (rc == NOTIFY_STOP)
return;
if (raw_mode && type != KT_SPEC && type != KT_SHIFT)
diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index d4e8b213a462..5d15630a5830 100644
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -1,7 +1,4 @@
-/* -*- linux-c -*-
- *
- * $Id: sysrq.c,v 1.15 1998/08/23 14:56:41 mj Exp $
- *
+/*
* Linux Magic System Request Key Hacks
*
* (c) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
@@ -10,8 +7,13 @@
* (c) 2000 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
* overhauled to use key registration
* based upon discusions in irc://irc.openprojects.net/#kernelnewbies
+ *
+ * Copyright (c) 2010 Dmitry Torokhov
+ * Input handler conversion
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
@@ -39,33 +41,34 @@
#include <linux/hrtimer.h>
#include <linux/oom.h>
#include <linux/slab.h>
+#include <linux/input.h>
#include <asm/ptrace.h>
#include <asm/irq_regs.h>
/* Whether we react on sysrq keys or just ignore them */
-int __read_mostly __sysrq_enabled = 1;
-
-static int __read_mostly sysrq_always_enabled;
+static int __read_mostly sysrq_enabled = 1;
+static bool __read_mostly sysrq_always_enabled;
-int sysrq_on(void)
+static bool sysrq_on(void)
{
- return __sysrq_enabled || sysrq_always_enabled;
+ return sysrq_enabled || sysrq_always_enabled;
}
/*
* A value of 1 means 'all', other nonzero values are an op mask:
*/
-static inline int sysrq_on_mask(int mask)
+static bool sysrq_on_mask(int mask)
{
- return sysrq_always_enabled || __sysrq_enabled == 1 ||
- (__sysrq_enabled & mask);
+ return sysrq_always_enabled ||
+ sysrq_enabled == 1 ||
+ (sysrq_enabled & mask);
}
static int __init sysrq_always_enabled_setup(char *str)
{
- sysrq_always_enabled = 1;
- printk(KERN_INFO "debug: sysrq always enabled.\n");
+ sysrq_always_enabled = true;
+ pr_info("sysrq always enabled.\n");
return 1;
}
@@ -76,6 +79,7 @@ __setup("sysrq_always_enabled", sysrq_always_enabled_setup);
static void sysrq_handle_loglevel(int key, struct tty_struct *tty)
{
int i;
+
i = key - '0';
console_loglevel = 7;
printk("Loglevel set to %d\n", i);
@@ -101,7 +105,7 @@ static struct sysrq_key_op sysrq_SAK_op = {
.enable_mask = SYSRQ_ENABLE_KEYBOARD,
};
#else
-#define sysrq_SAK_op (*(struct sysrq_key_op *)0)
+#define sysrq_SAK_op (*(struct sysrq_key_op *)NULL)
#endif
#ifdef CONFIG_VT
@@ -119,7 +123,7 @@ static struct sysrq_key_op sysrq_unraw_op = {
.enable_mask = SYSRQ_ENABLE_KEYBOARD,
};
#else
-#define sysrq_unraw_op (*(struct sysrq_key_op *)0)
+#define sysrq_unraw_op (*(struct sysrq_key_op *)NULL)
#endif /* CONFIG_VT */
static void sysrq_handle_crash(int key, struct tty_struct *tty)
@@ -195,7 +199,7 @@ static struct sysrq_key_op sysrq_showlocks_op = {
.action_msg = "Show Locks Held",
};
#else
-#define sysrq_showlocks_op (*(struct sysrq_key_op *)0)
+#define sysrq_showlocks_op (*(struct sysrq_key_op *)NULL)
#endif
#ifdef CONFIG_SMP
@@ -298,7 +302,7 @@ static struct sysrq_key_op sysrq_ftrace_dump_op = {
.enable_mask = SYSRQ_ENABLE_DUMP,
};
#else
-#define sysrq_ftrace_dump_op (*(struct sysrq_key_op *)0)
+#define sysrq_ftrace_dump_op (*(struct sysrq_key_op *)NULL)
#endif
static void sysrq_handle_showmem(int key, struct tty_struct *tty)
@@ -477,6 +481,7 @@ struct sysrq_key_op *__sysrq_get_key_op(int key)
i = sysrq_key_table_key2index(key);
if (i != -1)
op_p = sysrq_key_table[i];
+
return op_p;
}
@@ -488,11 +493,7 @@ static void __sysrq_put_key_op(int key, struct sysrq_key_op *op_p)
sysrq_key_table[i] = op_p;
}
-/*
- * This is the non-locking version of handle_sysrq. It must/can only be called
- * by sysrq key handlers, as they are inside of the lock
- */
-void __handle_sysrq(int key, struct tty_struct *tty, int check_mask)
+static void __handle_sysrq(int key, struct tty_struct *tty, int check_mask)
{
struct sysrq_key_op *op_p;
int orig_log_level;
@@ -544,10 +545,6 @@ void __handle_sysrq(int key, struct tty_struct *tty, int check_mask)
spin_unlock_irqrestore(&sysrq_key_table_lock, flags);
}
-/*
- * This function is called by the keyboard handler when SysRq is pressed
- * and any other keycode arrives.
- */
void handle_sysrq(int key, struct tty_struct *tty)
{
if (sysrq_on())
@@ -555,10 +552,177 @@ void handle_sysrq(int key, struct tty_struct *tty)
}
EXPORT_SYMBOL(handle_sysrq);
+#ifdef CONFIG_INPUT
+
+/* Simple translation table for the SysRq keys */
+static const unsigned char sysrq_xlate[KEY_MAX + 1] =
+ "\000\0331234567890-=\177\t" /* 0x00 - 0x0f */
+ "qwertyuiop[]\r\000as" /* 0x10 - 0x1f */
+ "dfghjkl;'`\000\\zxcv" /* 0x20 - 0x2f */
+ "bnm,./\000*\000 \000\201\202\203\204\205" /* 0x30 - 0x3f */
+ "\206\207\210\211\212\000\000789-456+1" /* 0x40 - 0x4f */
+ "230\177\000\000\213\214\000\000\000\000\000\000\000\000\000\000" /* 0x50 - 0x5f */
+ "\r\000/"; /* 0x60 - 0x6f */
+
+static bool sysrq_down;
+static int sysrq_alt_use;
+static int sysrq_alt;
+
+static bool sysrq_filter(struct input_handle *handle, unsigned int type,
+ unsigned int code, int value)
+{
+ if (type != EV_KEY)
+ goto out;
+
+ switch (code) {
+
+ case KEY_LEFTALT:
+ case KEY_RIGHTALT:
+ if (value)
+ sysrq_alt = code;
+ else if (sysrq_down && code == sysrq_alt_use)
+ sysrq_down = false;
+ break;
+
+ case KEY_SYSRQ:
+ if (value == 1 && sysrq_alt) {
+ sysrq_down = true;
+ sysrq_alt_use = sysrq_alt;
+ }
+ break;
+
+ default:
+ if (sysrq_down && value && value != 2)
+ __handle_sysrq(sysrq_xlate[code], NULL, 1);
+ break;
+ }
+
+out:
+ return sysrq_down;
+}
+
+static int sysrq_connect(struct input_handler *handler,
+ struct input_dev *dev,
+ const struct input_device_id *id)
+{
+ struct input_handle *handle;
+ int error;
+
+ sysrq_down = false;
+ sysrq_alt = 0;
+
+ handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
+ if (!handle)
+ return -ENOMEM;
+
+ handle->dev = dev;
+ handle->handler = handler;
+ handle->name = "sysrq";
+
+ error = input_register_handle(handle);
+ if (error) {
+ pr_err("Failed to register input sysrq handler, error %d\n",
+ error);
+ goto err_free;
+ }
+
+ error = input_open_device(handle);
+ if (error) {
+ pr_err("Failed to open input device, error %d\n", error);
+ goto err_unregister;
+ }
+
+ return 0;
+
+ err_unregister:
+ input_unregister_handle(handle);
+ err_free:
+ kfree(handle);
+ return error;
+}
+
+static void sysrq_disconnect(struct input_handle *handle)
+{
+ input_close_device(handle);
+ input_unregister_handle(handle);
+ kfree(handle);
+}
+
+/*
+ * We are matching on KEY_LEFTALT insteard of KEY_SYSRQ because not all
+ * keyboards have SysRq ikey predefined and so user may add it to keymap
+ * later, but we expect all such keyboards to have left alt.
+ */
+static const struct input_device_id sysrq_ids[] = {
+ {
+ .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
+ INPUT_DEVICE_ID_MATCH_KEYBIT,
+ .evbit = { BIT_MASK(EV_KEY) },
+ .keybit = { BIT_MASK(KEY_LEFTALT) },
+ },
+ { },
+};
+
+static struct input_handler sysrq_handler = {
+ .filter = sysrq_filter,
+ .connect = sysrq_connect,
+ .disconnect = sysrq_disconnect,
+ .name = "sysrq",
+ .id_table = sysrq_ids,
+};
+
+static bool sysrq_handler_registered;
+
+static inline void sysrq_register_handler(void)
+{
+ int error;
+
+ error = input_register_handler(&sysrq_handler);
+ if (error)
+ pr_err("Failed to register input handler, error %d", error);
+ else
+ sysrq_handler_registered = true;
+}
+
+static inline void sysrq_unregister_handler(void)
+{
+ if (sysrq_handler_registered) {
+ input_unregister_handler(&sysrq_handler);
+ sysrq_handler_registered = false;
+ }
+}
+
+#else
+
+static inline void sysrq_register_handler(void)
+{
+}
+
+static inline void sysrq_unregister_handler(void)
+{
+}
+
+#endif /* CONFIG_INPUT */
+
+int sysrq_toggle_support(int enable_mask)
+{
+ bool was_enabled = sysrq_on();
+
+ sysrq_enabled = enable_mask;
+
+ if (was_enabled != sysrq_on()) {
+ if (sysrq_on())
+ sysrq_register_handler();
+ else
+ sysrq_unregister_handler();
+ }
+
+ return 0;
+}
+
static int __sysrq_swap_key_ops(int key, struct sysrq_key_op *insert_op_p,
struct sysrq_key_op *remove_op_p)
{
-
int retval;
unsigned long flags;
@@ -599,6 +763,7 @@ static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
return -EFAULT;
__handle_sysrq(c, NULL, 0);
}
+
return count;
}
@@ -606,10 +771,28 @@ static const struct file_operations proc_sysrq_trigger_operations = {
.write = write_sysrq_trigger,
};
+static void sysrq_init_procfs(void)
+{
+ if (!proc_create("sysrq-trigger", S_IWUSR, NULL,
+ &proc_sysrq_trigger_operations))
+ pr_err("Failed to register proc interface\n");
+}
+
+#else
+
+static inline void sysrq_init_procfs(void)
+{
+}
+
+#endif /* CONFIG_PROC_FS */
+
static int __init sysrq_init(void)
{
- proc_create("sysrq-trigger", S_IWUSR, NULL, &proc_sysrq_trigger_operations);
+ sysrq_init_procfs();
+
+ if (sysrq_on())
+ sysrq_register_handler();
+
return 0;
}
module_init(sysrq_init);
-#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-01 09:41:06 +0000