2 * Front panel driver for Linux
3 * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version
8 * 2 of the License, or (at your option) any later version.
10 * This code drives an LCD module (/dev/lcd), and a keypad (/dev/keypad)
11 * connected to a parallel printer port.
13 * The LCD module may either be an HD44780-like 8-bit parallel LCD, or a 1-bit
14 * serial module compatible with Samsung's KS0074. The pins may be connected in
15 * any combination, everything is programmable.
17 * The keypad consists in a matrix of push buttons connecting input pins to
18 * data output pins or to the ground. The combinations have to be hard-coded
19 * in the driver, though several profiles exist and adding new ones is easy.
21 * Several profiles are provided for commonly found LCD+keypad modules on the
22 * market, such as those found in Nexcom's appliances.
25 * - the initialization/deinitialization process is very dirty and should
26 * be rewritten. It may even be buggy.
29 * - document 24 keys keyboard (3 rows of 8 cols, 32 diodes + 2 inputs)
30 * - make the LCD a part of a virtual screen of Vx*Vy
31 * - make the inputs list smp-safe
32 * - change the keyboard to a double mapping : signals -> key_id -> values
33 * so that applications can change values without knowing signals
37 #include <linux/module.h>
39 #include <linux/types.h>
40 #include <linux/errno.h>
41 #include <linux/signal.h>
42 #include <linux/sched.h>
43 #include <linux/spinlock.h>
44 #include <linux/interrupt.h>
45 #include <linux/miscdevice.h>
46 #include <linux/slab.h>
47 #include <linux/ioport.h>
48 #include <linux/fcntl.h>
49 #include <linux/init.h>
50 #include <linux/delay.h>
51 #include <linux/kernel.h>
52 #include <linux/ctype.h>
53 #include <linux/parport.h>
54 #include <linux/list.h>
55 #include <linux/notifier.h>
56 #include <linux/reboot.h>
57 #include <generated/utsrelease.h>
60 #include <linux/uaccess.h>
63 #define KEYPAD_MINOR 185
65 #define PANEL_VERSION "0.9.5"
67 #define LCD_MAXBYTES 256 /* max burst write */
69 #define KEYPAD_BUFFER 64
71 /* poll the keyboard this every second */
72 #define INPUT_POLL_TIME (HZ/50)
73 /* a key starts to repeat after this times INPUT_POLL_TIME */
74 #define KEYPAD_REP_START (10)
75 /* a key repeats this times INPUT_POLL_TIME */
76 #define KEYPAD_REP_DELAY (2)
78 /* keep the light on this times INPUT_POLL_TIME for each flash */
79 #define FLASH_LIGHT_TEMPO (200)
81 /* converts an r_str() input to an active high, bits string : 000BAOSE */
82 #define PNL_PINPUT(a) ((((unsigned char)(a)) ^ 0x7F) >> 3)
84 #define PNL_PBUSY 0x80 /* inverted input, active low */
85 #define PNL_PACK 0x40 /* direct input, active low */
86 #define PNL_POUTPA 0x20 /* direct input, active high */
87 #define PNL_PSELECD 0x10 /* direct input, active high */
88 #define PNL_PERRORP 0x08 /* direct input, active low */
90 #define PNL_PBIDIR 0x20 /* bi-directional ports */
91 /* high to read data in or-ed with data out */
92 #define PNL_PINTEN 0x10
93 #define PNL_PSELECP 0x08 /* inverted output, active low */
94 #define PNL_PINITP 0x04 /* direct output, active low */
95 #define PNL_PAUTOLF 0x02 /* inverted output, active low */
96 #define PNL_PSTROBE 0x01 /* inverted output */
117 #define PIN_AUTOLF 14
119 #define PIN_SELECP 17
120 #define PIN_NOT_SET 127
122 #define LCD_FLAG_S 0x0001
123 #define LCD_FLAG_ID 0x0002
124 #define LCD_FLAG_B 0x0004 /* blink on */
125 #define LCD_FLAG_C 0x0008 /* cursor on */
126 #define LCD_FLAG_D 0x0010 /* display on */
127 #define LCD_FLAG_F 0x0020 /* large font mode */
128 #define LCD_FLAG_N 0x0040 /* 2-rows mode */
129 #define LCD_FLAG_L 0x0080 /* backlight enabled */
131 #define LCD_ESCAPE_LEN 24 /* max chars for LCD escape command */
132 #define LCD_ESCAPE_CHAR 27 /* use char 27 for escape command */
134 /* macros to simplify use of the parallel port */
135 #define r_ctr(x) (parport_read_control((x)->port))
136 #define r_dtr(x) (parport_read_data((x)->port))
137 #define r_str(x) (parport_read_status((x)->port))
138 #define w_ctr(x, y) do { parport_write_control((x)->port, (y)); } while (0)
139 #define w_dtr(x, y) do { parport_write_data((x)->port, (y)); } while (0)
141 /* this defines which bits are to be used and which ones to be ignored */
142 /* logical or of the output bits involved in the scan matrix */
143 static __u8 scan_mask_o
;
144 /* logical or of the input bits involved in the scan matrix */
145 static __u8 scan_mask_i
;
147 typedef __u64 pmask_t
;
161 struct logical_input
{
162 struct list_head list
;
165 enum input_type type
;
166 enum input_state state
;
167 __u8 rise_time
, fall_time
;
168 __u8 rise_timer
, fall_timer
, high_timer
;
171 struct { /* valid when type == INPUT_TYPE_STD */
172 void (*press_fct
) (int);
173 void (*release_fct
) (int);
177 struct { /* valid when type == INPUT_TYPE_KBD */
178 /* strings can be non null-terminated */
179 char press_str
[sizeof(void *) + sizeof(int)];
180 char repeat_str
[sizeof(void *) + sizeof(int)];
181 char release_str
[sizeof(void *) + sizeof(int)];
186 LIST_HEAD(logical_inputs
); /* list of all defined logical inputs */
188 /* physical contacts history
189 * Physical contacts are a 45 bits string of 9 groups of 5 bits each.
190 * The 8 lower groups correspond to output bits 0 to 7, and the 9th group
191 * corresponds to the ground.
192 * Within each group, bits are stored in the same order as read on the port :
193 * BAPSE (busy=4, ack=3, paper empty=2, select=1, error=0).
194 * So, each __u64 (or pmask_t) is represented like this :
195 * 0000000000000000000BAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSE
196 * <-----unused------><gnd><d07><d06><d05><d04><d03><d02><d01><d00>
199 /* what has just been read from the I/O ports */
200 static pmask_t phys_read
;
201 /* previous phys_read */
202 static pmask_t phys_read_prev
;
203 /* stabilized phys_read (phys_read|phys_read_prev) */
204 static pmask_t phys_curr
;
205 /* previous phys_curr */
206 static pmask_t phys_prev
;
207 /* 0 means that at least one logical signal needs be computed */
208 static char inputs_stable
;
210 /* these variables are specific to the keypad */
211 static char keypad_buffer
[KEYPAD_BUFFER
];
212 static int keypad_buflen
;
213 static int keypad_start
;
214 static char keypressed
;
215 static wait_queue_head_t keypad_read_wait
;
217 /* lcd-specific variables */
219 /* contains the LCD config state */
220 static unsigned long int lcd_flags
;
221 /* contains the LCD X offset */
222 static unsigned long int lcd_addr_x
;
223 /* contains the LCD Y offset */
224 static unsigned long int lcd_addr_y
;
225 /* current escape sequence, 0 terminated */
226 static char lcd_escape
[LCD_ESCAPE_LEN
+ 1];
227 /* not in escape state. >=0 = escape cmd len */
228 static int lcd_escape_len
= -1;
231 * Bit masks to convert LCD signals to parallel port outputs.
232 * _d_ are values for data port, _c_ are for control port.
233 * [0] = signal OFF, [1] = signal ON, [2] = mask
240 * one entry for each bit on the LCD
251 * each bit can be either connected to a DATA or CTRL port
257 static unsigned char lcd_bits
[LCD_PORTS
][LCD_BITS
][BIT_STATES
];
262 #define LCD_PROTO_PARALLEL 0
263 #define LCD_PROTO_SERIAL 1
264 #define LCD_PROTO_TI_DA8XX_LCD 2
269 #define LCD_CHARSET_NORMAL 0
270 #define LCD_CHARSET_KS0074 1
275 #define LCD_TYPE_NONE 0
276 #define LCD_TYPE_OLD 1
277 #define LCD_TYPE_KS0074 2
278 #define LCD_TYPE_HANTRONIX 3
279 #define LCD_TYPE_NEXCOM 4
280 #define LCD_TYPE_CUSTOM 5
285 #define KEYPAD_TYPE_NONE 0
286 #define KEYPAD_TYPE_OLD 1
287 #define KEYPAD_TYPE_NEW 2
288 #define KEYPAD_TYPE_NEXCOM 3
293 #define PANEL_PROFILE_CUSTOM 0
294 #define PANEL_PROFILE_OLD 1
295 #define PANEL_PROFILE_NEW 2
296 #define PANEL_PROFILE_HANTRONIX 3
297 #define PANEL_PROFILE_NEXCOM 4
298 #define PANEL_PROFILE_LARGE 5
301 * Construct custom config from the kernel's configuration
303 #define DEFAULT_PROFILE PANEL_PROFILE_LARGE
304 #define DEFAULT_PARPORT 0
305 #define DEFAULT_LCD LCD_TYPE_OLD
306 #define DEFAULT_KEYPAD KEYPAD_TYPE_OLD
307 #define DEFAULT_LCD_WIDTH 40
308 #define DEFAULT_LCD_BWIDTH 40
309 #define DEFAULT_LCD_HWIDTH 64
310 #define DEFAULT_LCD_HEIGHT 2
311 #define DEFAULT_LCD_PROTO LCD_PROTO_PARALLEL
313 #define DEFAULT_LCD_PIN_E PIN_AUTOLF
314 #define DEFAULT_LCD_PIN_RS PIN_SELECP
315 #define DEFAULT_LCD_PIN_RW PIN_INITP
316 #define DEFAULT_LCD_PIN_SCL PIN_STROBE
317 #define DEFAULT_LCD_PIN_SDA PIN_D0
318 #define DEFAULT_LCD_PIN_BL PIN_NOT_SET
319 #define DEFAULT_LCD_CHARSET LCD_CHARSET_NORMAL
321 #ifdef CONFIG_PANEL_PROFILE
322 #undef DEFAULT_PROFILE
323 #define DEFAULT_PROFILE CONFIG_PANEL_PROFILE
326 #ifdef CONFIG_PANEL_PARPORT
327 #undef DEFAULT_PARPORT
328 #define DEFAULT_PARPORT CONFIG_PANEL_PARPORT
331 #if DEFAULT_PROFILE == 0 /* custom */
332 #ifdef CONFIG_PANEL_KEYPAD
333 #undef DEFAULT_KEYPAD
334 #define DEFAULT_KEYPAD CONFIG_PANEL_KEYPAD
337 #ifdef CONFIG_PANEL_LCD
339 #define DEFAULT_LCD CONFIG_PANEL_LCD
342 #ifdef CONFIG_PANEL_LCD_WIDTH
343 #undef DEFAULT_LCD_WIDTH
344 #define DEFAULT_LCD_WIDTH CONFIG_PANEL_LCD_WIDTH
347 #ifdef CONFIG_PANEL_LCD_BWIDTH
348 #undef DEFAULT_LCD_BWIDTH
349 #define DEFAULT_LCD_BWIDTH CONFIG_PANEL_LCD_BWIDTH
352 #ifdef CONFIG_PANEL_LCD_HWIDTH
353 #undef DEFAULT_LCD_HWIDTH
354 #define DEFAULT_LCD_HWIDTH CONFIG_PANEL_LCD_HWIDTH
357 #ifdef CONFIG_PANEL_LCD_HEIGHT
358 #undef DEFAULT_LCD_HEIGHT
359 #define DEFAULT_LCD_HEIGHT CONFIG_PANEL_LCD_HEIGHT
362 #ifdef CONFIG_PANEL_LCD_PROTO
363 #undef DEFAULT_LCD_PROTO
364 #define DEFAULT_LCD_PROTO CONFIG_PANEL_LCD_PROTO
367 #ifdef CONFIG_PANEL_LCD_PIN_E
368 #undef DEFAULT_LCD_PIN_E
369 #define DEFAULT_LCD_PIN_E CONFIG_PANEL_LCD_PIN_E
372 #ifdef CONFIG_PANEL_LCD_PIN_RS
373 #undef DEFAULT_LCD_PIN_RS
374 #define DEFAULT_LCD_PIN_RS CONFIG_PANEL_LCD_PIN_RS
377 #ifdef CONFIG_PANEL_LCD_PIN_RW
378 #undef DEFAULT_LCD_PIN_RW
379 #define DEFAULT_LCD_PIN_RW CONFIG_PANEL_LCD_PIN_RW
382 #ifdef CONFIG_PANEL_LCD_PIN_SCL
383 #undef DEFAULT_LCD_PIN_SCL
384 #define DEFAULT_LCD_PIN_SCL CONFIG_PANEL_LCD_PIN_SCL
387 #ifdef CONFIG_PANEL_LCD_PIN_SDA
388 #undef DEFAULT_LCD_PIN_SDA
389 #define DEFAULT_LCD_PIN_SDA CONFIG_PANEL_LCD_PIN_SDA
392 #ifdef CONFIG_PANEL_LCD_PIN_BL
393 #undef DEFAULT_LCD_PIN_BL
394 #define DEFAULT_LCD_PIN_BL CONFIG_PANEL_LCD_PIN_BL
397 #ifdef CONFIG_PANEL_LCD_CHARSET
398 #undef DEFAULT_LCD_CHARSET
399 #define DEFAULT_LCD_CHARSET CONFIG_PANEL_LCD_CHARSET
402 #endif /* DEFAULT_PROFILE == 0 */
404 /* global variables */
405 static int keypad_open_cnt
; /* #times opened */
406 static int lcd_open_cnt
; /* #times opened */
407 static struct pardevice
*pprt
;
409 static int lcd_initialized
;
410 static int keypad_initialized
;
412 static int light_tempo
;
414 static char lcd_must_clear
;
415 static char lcd_left_shift
;
416 static char init_in_progress
;
418 static void (*lcd_write_cmd
) (int);
419 static void (*lcd_write_data
) (int);
420 static void (*lcd_clear_fast
) (void);
422 static DEFINE_SPINLOCK(pprt_lock
);
423 static struct timer_list scan_timer
;
425 MODULE_DESCRIPTION("Generic parallel port LCD/Keypad driver");
427 static int parport
= -1;
428 module_param(parport
, int, 0000);
429 MODULE_PARM_DESC(parport
, "Parallel port index (0=lpt1, 1=lpt2, ...)");
431 static int lcd_height
= -1;
432 module_param(lcd_height
, int, 0000);
433 MODULE_PARM_DESC(lcd_height
, "Number of lines on the LCD");
435 static int lcd_width
= -1;
436 module_param(lcd_width
, int, 0000);
437 MODULE_PARM_DESC(lcd_width
, "Number of columns on the LCD");
439 static int lcd_bwidth
= -1; /* internal buffer width (usually 40) */
440 module_param(lcd_bwidth
, int, 0000);
441 MODULE_PARM_DESC(lcd_bwidth
, "Internal LCD line width (40)");
443 static int lcd_hwidth
= -1; /* hardware buffer width (usually 64) */
444 module_param(lcd_hwidth
, int, 0000);
445 MODULE_PARM_DESC(lcd_hwidth
, "LCD line hardware address (64)");
447 static int lcd_enabled
= -1;
448 module_param(lcd_enabled
, int, 0000);
449 MODULE_PARM_DESC(lcd_enabled
, "Deprecated option, use lcd_type instead");
451 static int keypad_enabled
= -1;
452 module_param(keypad_enabled
, int, 0000);
453 MODULE_PARM_DESC(keypad_enabled
, "Deprecated option, use keypad_type instead");
455 static int lcd_type
= -1;
456 module_param(lcd_type
, int, 0000);
457 MODULE_PARM_DESC(lcd_type
,
458 "LCD type: 0=none, 1=old //, 2=serial ks0074, "
459 "3=hantronix //, 4=nexcom //, 5=compiled-in");
461 static int lcd_proto
= -1;
462 module_param(lcd_proto
, int, 0000);
463 MODULE_PARM_DESC(lcd_proto
,
464 "LCD communication: 0=parallel (//), 1=serial,"
465 "2=TI LCD Interface");
467 static int lcd_charset
= -1;
468 module_param(lcd_charset
, int, 0000);
469 MODULE_PARM_DESC(lcd_charset
, "LCD character set: 0=standard, 1=KS0074");
471 static int keypad_type
= -1;
472 module_param(keypad_type
, int, 0000);
473 MODULE_PARM_DESC(keypad_type
,
474 "Keypad type: 0=none, 1=old 6 keys, 2=new 6+1 keys, "
477 static int profile
= DEFAULT_PROFILE
;
478 module_param(profile
, int, 0000);
479 MODULE_PARM_DESC(profile
,
480 "1=16x2 old kp; 2=serial 16x2, new kp; 3=16x2 hantronix; "
481 "4=16x2 nexcom; default=40x2, old kp");
484 * These are the parallel port pins the LCD control signals are connected to.
485 * Set this to 0 if the signal is not used. Set it to its opposite value
486 * (negative) if the signal is negated. -MAXINT is used to indicate that the
487 * pin has not been explicitly specified.
489 * WARNING! no check will be performed about collisions with keypad !
492 static int lcd_e_pin
= PIN_NOT_SET
;
493 module_param(lcd_e_pin
, int, 0000);
494 MODULE_PARM_DESC(lcd_e_pin
,
495 "# of the // port pin connected to LCD 'E' signal, "
496 "with polarity (-17..17)");
498 static int lcd_rs_pin
= PIN_NOT_SET
;
499 module_param(lcd_rs_pin
, int, 0000);
500 MODULE_PARM_DESC(lcd_rs_pin
,
501 "# of the // port pin connected to LCD 'RS' signal, "
502 "with polarity (-17..17)");
504 static int lcd_rw_pin
= PIN_NOT_SET
;
505 module_param(lcd_rw_pin
, int, 0000);
506 MODULE_PARM_DESC(lcd_rw_pin
,
507 "# of the // port pin connected to LCD 'RW' signal, "
508 "with polarity (-17..17)");
510 static int lcd_bl_pin
= PIN_NOT_SET
;
511 module_param(lcd_bl_pin
, int, 0000);
512 MODULE_PARM_DESC(lcd_bl_pin
,
513 "# of the // port pin connected to LCD backlight, "
514 "with polarity (-17..17)");
516 static int lcd_da_pin
= PIN_NOT_SET
;
517 module_param(lcd_da_pin
, int, 0000);
518 MODULE_PARM_DESC(lcd_da_pin
,
519 "# of the // port pin connected to serial LCD 'SDA' "
520 "signal, with polarity (-17..17)");
522 static int lcd_cl_pin
= PIN_NOT_SET
;
523 module_param(lcd_cl_pin
, int, 0000);
524 MODULE_PARM_DESC(lcd_cl_pin
,
525 "# of the // port pin connected to serial LCD 'SCL' "
526 "signal, with polarity (-17..17)");
528 static unsigned char *lcd_char_conv
;
530 /* for some LCD drivers (ks0074) we need a charset conversion table. */
531 static unsigned char lcd_char_conv_ks0074
[256] = {
532 /* 0|8 1|9 2|A 3|B 4|C 5|D 6|E 7|F */
533 /* 0x00 */ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
534 /* 0x08 */ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
535 /* 0x10 */ 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
536 /* 0x18 */ 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
537 /* 0x20 */ 0x20, 0x21, 0x22, 0x23, 0xa2, 0x25, 0x26, 0x27,
538 /* 0x28 */ 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
539 /* 0x30 */ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
540 /* 0x38 */ 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
541 /* 0x40 */ 0xa0, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
542 /* 0x48 */ 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
543 /* 0x50 */ 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
544 /* 0x58 */ 0x58, 0x59, 0x5a, 0xfa, 0xfb, 0xfc, 0x1d, 0xc4,
545 /* 0x60 */ 0x96, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
546 /* 0x68 */ 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
547 /* 0x70 */ 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
548 /* 0x78 */ 0x78, 0x79, 0x7a, 0xfd, 0xfe, 0xff, 0xce, 0x20,
549 /* 0x80 */ 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
550 /* 0x88 */ 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
551 /* 0x90 */ 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
552 /* 0x98 */ 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
553 /* 0xA0 */ 0x20, 0x40, 0xb1, 0xa1, 0x24, 0xa3, 0xfe, 0x5f,
554 /* 0xA8 */ 0x22, 0xc8, 0x61, 0x14, 0x97, 0x2d, 0xad, 0x96,
555 /* 0xB0 */ 0x80, 0x8c, 0x82, 0x83, 0x27, 0x8f, 0x86, 0xdd,
556 /* 0xB8 */ 0x2c, 0x81, 0x6f, 0x15, 0x8b, 0x8a, 0x84, 0x60,
557 /* 0xC0 */ 0xe2, 0xe2, 0xe2, 0x5b, 0x5b, 0xae, 0xbc, 0xa9,
558 /* 0xC8 */ 0xc5, 0xbf, 0xc6, 0xf1, 0xe3, 0xe3, 0xe3, 0xe3,
559 /* 0xD0 */ 0x44, 0x5d, 0xa8, 0xe4, 0xec, 0xec, 0x5c, 0x78,
560 /* 0xD8 */ 0xab, 0xa6, 0xe5, 0x5e, 0x5e, 0xe6, 0xaa, 0xbe,
561 /* 0xE0 */ 0x7f, 0xe7, 0xaf, 0x7b, 0x7b, 0xaf, 0xbd, 0xc8,
562 /* 0xE8 */ 0xa4, 0xa5, 0xc7, 0xf6, 0xa7, 0xe8, 0x69, 0x69,
563 /* 0xF0 */ 0xed, 0x7d, 0xa8, 0xe4, 0xec, 0x5c, 0x5c, 0x25,
564 /* 0xF8 */ 0xac, 0xa6, 0xea, 0xef, 0x7e, 0xeb, 0xb2, 0x79,
567 char old_keypad_profile
[][4][9] = {
568 {"S0", "Left\n", "Left\n", ""},
569 {"S1", "Down\n", "Down\n", ""},
570 {"S2", "Up\n", "Up\n", ""},
571 {"S3", "Right\n", "Right\n", ""},
572 {"S4", "Esc\n", "Esc\n", ""},
573 {"S5", "Ret\n", "Ret\n", ""},
577 /* signals, press, repeat, release */
578 char new_keypad_profile
[][4][9] = {
579 {"S0", "Left\n", "Left\n", ""},
580 {"S1", "Down\n", "Down\n", ""},
581 {"S2", "Up\n", "Up\n", ""},
582 {"S3", "Right\n", "Right\n", ""},
583 {"S4s5", "", "Esc\n", "Esc\n"},
584 {"s4S5", "", "Ret\n", "Ret\n"},
585 {"S4S5", "Help\n", "", ""},
586 /* add new signals above this line */
590 /* signals, press, repeat, release */
591 char nexcom_keypad_profile
[][4][9] = {
592 {"a-p-e-", "Down\n", "Down\n", ""},
593 {"a-p-E-", "Ret\n", "Ret\n", ""},
594 {"a-P-E-", "Esc\n", "Esc\n", ""},
595 {"a-P-e-", "Up\n", "Up\n", ""},
596 /* add new signals above this line */
600 static char (*keypad_profile
)[4][9] = old_keypad_profile
;
602 /* FIXME: this should be converted to a bit array containing signals states */
604 unsigned char e
; /* parallel LCD E (data latch on falling edge) */
605 unsigned char rs
; /* parallel LCD RS (0 = cmd, 1 = data) */
606 unsigned char rw
; /* parallel LCD R/W (0 = W, 1 = R) */
607 unsigned char bl
; /* parallel LCD backlight (0 = off, 1 = on) */
608 unsigned char cl
; /* serial LCD clock (latch on rising edge) */
609 unsigned char da
; /* serial LCD data */
612 static void init_scan_timer(void);
614 /* sets data port bits according to current signals values */
615 static int set_data_bits(void)
620 for (bit
= 0; bit
< LCD_BITS
; bit
++)
621 val
&= lcd_bits
[LCD_PORT_D
][bit
][BIT_MSK
];
623 val
|= lcd_bits
[LCD_PORT_D
][LCD_BIT_E
][bits
.e
]
624 | lcd_bits
[LCD_PORT_D
][LCD_BIT_RS
][bits
.rs
]
625 | lcd_bits
[LCD_PORT_D
][LCD_BIT_RW
][bits
.rw
]
626 | lcd_bits
[LCD_PORT_D
][LCD_BIT_BL
][bits
.bl
]
627 | lcd_bits
[LCD_PORT_D
][LCD_BIT_CL
][bits
.cl
]
628 | lcd_bits
[LCD_PORT_D
][LCD_BIT_DA
][bits
.da
];
634 /* sets ctrl port bits according to current signals values */
635 static int set_ctrl_bits(void)
640 for (bit
= 0; bit
< LCD_BITS
; bit
++)
641 val
&= lcd_bits
[LCD_PORT_C
][bit
][BIT_MSK
];
643 val
|= lcd_bits
[LCD_PORT_C
][LCD_BIT_E
][bits
.e
]
644 | lcd_bits
[LCD_PORT_C
][LCD_BIT_RS
][bits
.rs
]
645 | lcd_bits
[LCD_PORT_C
][LCD_BIT_RW
][bits
.rw
]
646 | lcd_bits
[LCD_PORT_C
][LCD_BIT_BL
][bits
.bl
]
647 | lcd_bits
[LCD_PORT_C
][LCD_BIT_CL
][bits
.cl
]
648 | lcd_bits
[LCD_PORT_C
][LCD_BIT_DA
][bits
.da
];
654 /* sets ctrl & data port bits according to current signals values */
655 static void panel_set_bits(void)
662 * Converts a parallel port pin (from -25 to 25) to data and control ports
663 * masks, and data and control port bits. The signal will be considered
664 * unconnected if it's on pin 0 or an invalid pin (<-25 or >25).
666 * Result will be used this way :
667 * out(dport, in(dport) & d_val[2] | d_val[signal_state])
668 * out(cport, in(cport) & c_val[2] | c_val[signal_state])
670 void pin_to_bits(int pin
, unsigned char *d_val
, unsigned char *c_val
)
672 int d_bit
, c_bit
, inv
;
674 d_val
[0] = c_val
[0] = d_val
[1] = c_val
[1] = 0;
675 d_val
[2] = c_val
[2] = 0xFF;
687 case PIN_STROBE
: /* strobe, inverted */
691 case PIN_D0
...PIN_D7
: /* D0 - D7 = 2 - 9 */
692 d_bit
= 1 << (pin
- 2);
694 case PIN_AUTOLF
: /* autofeed, inverted */
698 case PIN_INITP
: /* init, direct */
701 case PIN_SELECP
: /* select_in, inverted */
705 default: /* unknown pin, ignore */
718 /* sleeps that many milliseconds with a reschedule */
719 static void long_sleep(int ms
)
725 current
->state
= TASK_INTERRUPTIBLE
;
726 schedule_timeout((ms
* HZ
+ 999) / 1000);
730 /* send a serial byte to the LCD panel. The caller is responsible for locking
732 static void lcd_send_serial(int byte
)
736 /* the data bit is set on D0, and the clock on STROBE.
737 * LCD reads D0 on STROBE's rising edge. */
738 for (bit
= 0; bit
< 8; bit
++) {
739 bits
.cl
= BIT_CLR
; /* CLK low */
743 udelay(2); /* maintain the data during 2 us before CLK up */
744 bits
.cl
= BIT_SET
; /* CLK high */
746 udelay(1); /* maintain the strobe during 1 us */
751 /* turn the backlight on or off */
752 static void lcd_backlight(int on
)
754 if (lcd_bl_pin
== PIN_NONE
)
757 /* The backlight is activated by seting the AUTOFEED line to +5V */
758 spin_lock(&pprt_lock
);
761 spin_unlock(&pprt_lock
);
764 /* send a command to the LCD panel in serial mode */
765 static void lcd_write_cmd_s(int cmd
)
767 spin_lock(&pprt_lock
);
768 lcd_send_serial(0x1F); /* R/W=W, RS=0 */
769 lcd_send_serial(cmd
& 0x0F);
770 lcd_send_serial((cmd
>> 4) & 0x0F);
771 udelay(40); /* the shortest command takes at least 40 us */
772 spin_unlock(&pprt_lock
);
775 /* send data to the LCD panel in serial mode */
776 static void lcd_write_data_s(int data
)
778 spin_lock(&pprt_lock
);
779 lcd_send_serial(0x5F); /* R/W=W, RS=1 */
780 lcd_send_serial(data
& 0x0F);
781 lcd_send_serial((data
>> 4) & 0x0F);
782 udelay(40); /* the shortest data takes at least 40 us */
783 spin_unlock(&pprt_lock
);
786 /* send a command to the LCD panel in 8 bits parallel mode */
787 static void lcd_write_cmd_p8(int cmd
)
789 spin_lock(&pprt_lock
);
790 /* present the data to the data port */
792 udelay(20); /* maintain the data during 20 us before the strobe */
799 udelay(40); /* maintain the strobe during 40 us */
804 udelay(120); /* the shortest command takes at least 120 us */
805 spin_unlock(&pprt_lock
);
808 /* send data to the LCD panel in 8 bits parallel mode */
809 static void lcd_write_data_p8(int data
)
811 spin_lock(&pprt_lock
);
812 /* present the data to the data port */
814 udelay(20); /* maintain the data during 20 us before the strobe */
821 udelay(40); /* maintain the strobe during 40 us */
826 udelay(45); /* the shortest data takes at least 45 us */
827 spin_unlock(&pprt_lock
);
830 /* send a command to the TI LCD panel */
831 static void lcd_write_cmd_tilcd(int cmd
)
833 spin_lock(&pprt_lock
);
834 /* present the data to the control port */
837 spin_unlock(&pprt_lock
);
840 /* send data to the TI LCD panel */
841 static void lcd_write_data_tilcd(int data
)
843 spin_lock(&pprt_lock
);
844 /* present the data to the data port */
847 spin_unlock(&pprt_lock
);
850 static void lcd_gotoxy(void)
852 lcd_write_cmd(0x80 /* set DDRAM address */
853 | (lcd_addr_y
? lcd_hwidth
: 0)
854 /* we force the cursor to stay at the end of the
855 line if it wants to go farther */
856 | ((lcd_addr_x
< lcd_bwidth
) ? lcd_addr_x
&
857 (lcd_hwidth
- 1) : lcd_bwidth
- 1));
860 static void lcd_print(char c
)
862 if (lcd_addr_x
< lcd_bwidth
) {
863 if (lcd_char_conv
!= NULL
)
864 c
= lcd_char_conv
[(unsigned char)c
];
868 /* prevents the cursor from wrapping onto the next line */
869 if (lcd_addr_x
== lcd_bwidth
)
873 /* fills the display with spaces and resets X/Y */
874 static void lcd_clear_fast_s(void)
877 lcd_addr_x
= lcd_addr_y
= 0;
880 spin_lock(&pprt_lock
);
881 for (pos
= 0; pos
< lcd_height
* lcd_hwidth
; pos
++) {
882 lcd_send_serial(0x5F); /* R/W=W, RS=1 */
883 lcd_send_serial(' ' & 0x0F);
884 lcd_send_serial((' ' >> 4) & 0x0F);
885 udelay(40); /* the shortest data takes at least 40 us */
887 spin_unlock(&pprt_lock
);
889 lcd_addr_x
= lcd_addr_y
= 0;
893 /* fills the display with spaces and resets X/Y */
894 static void lcd_clear_fast_p8(void)
897 lcd_addr_x
= lcd_addr_y
= 0;
900 spin_lock(&pprt_lock
);
901 for (pos
= 0; pos
< lcd_height
* lcd_hwidth
; pos
++) {
902 /* present the data to the data port */
905 /* maintain the data during 20 us before the strobe */
913 /* maintain the strobe during 40 us */
919 /* the shortest data takes at least 45 us */
922 spin_unlock(&pprt_lock
);
924 lcd_addr_x
= lcd_addr_y
= 0;
928 /* fills the display with spaces and resets X/Y */
929 static void lcd_clear_fast_tilcd(void)
932 lcd_addr_x
= lcd_addr_y
= 0;
935 spin_lock(&pprt_lock
);
936 for (pos
= 0; pos
< lcd_height
* lcd_hwidth
; pos
++) {
937 /* present the data to the data port */
942 spin_unlock(&pprt_lock
);
944 lcd_addr_x
= lcd_addr_y
= 0;
948 /* clears the display and resets X/Y */
949 static void lcd_clear_display(void)
951 lcd_write_cmd(0x01); /* clear display */
952 lcd_addr_x
= lcd_addr_y
= 0;
953 /* we must wait a few milliseconds (15) */
957 static void lcd_init_display(void)
960 lcd_flags
= ((lcd_height
> 1) ? LCD_FLAG_N
: 0)
961 | LCD_FLAG_D
| LCD_FLAG_C
| LCD_FLAG_B
;
963 long_sleep(20); /* wait 20 ms after power-up for the paranoid */
965 lcd_write_cmd(0x30); /* 8bits, 1 line, small fonts */
967 lcd_write_cmd(0x30); /* 8bits, 1 line, small fonts */
969 lcd_write_cmd(0x30); /* 8bits, 1 line, small fonts */
972 lcd_write_cmd(0x30 /* set font height and lines number */
973 | ((lcd_flags
& LCD_FLAG_F
) ? 4 : 0)
974 | ((lcd_flags
& LCD_FLAG_N
) ? 8 : 0)
978 lcd_write_cmd(0x08); /* display off, cursor off, blink off */
981 lcd_write_cmd(0x08 /* set display mode */
982 | ((lcd_flags
& LCD_FLAG_D
) ? 4 : 0)
983 | ((lcd_flags
& LCD_FLAG_C
) ? 2 : 0)
984 | ((lcd_flags
& LCD_FLAG_B
) ? 1 : 0)
987 lcd_backlight((lcd_flags
& LCD_FLAG_L
) ? 1 : 0);
991 /* entry mode set : increment, cursor shifting */
998 * These are the file operation function for user access to /dev/lcd
999 * This function can also be called from inside the kernel, by
1000 * setting file and ppos to NULL.
1004 static inline int handle_lcd_special_code(void)
1006 /* LCD special codes */
1010 char *esc
= lcd_escape
+ 2;
1011 int oldflags
= lcd_flags
;
1013 /* check for display mode flags */
1015 case 'D': /* Display ON */
1016 lcd_flags
|= LCD_FLAG_D
;
1019 case 'd': /* Display OFF */
1020 lcd_flags
&= ~LCD_FLAG_D
;
1023 case 'C': /* Cursor ON */
1024 lcd_flags
|= LCD_FLAG_C
;
1027 case 'c': /* Cursor OFF */
1028 lcd_flags
&= ~LCD_FLAG_C
;
1031 case 'B': /* Blink ON */
1032 lcd_flags
|= LCD_FLAG_B
;
1035 case 'b': /* Blink OFF */
1036 lcd_flags
&= ~LCD_FLAG_B
;
1039 case '+': /* Back light ON */
1040 lcd_flags
|= LCD_FLAG_L
;
1043 case '-': /* Back light OFF */
1044 lcd_flags
&= ~LCD_FLAG_L
;
1048 /* flash back light using the keypad timer */
1049 if (scan_timer
.function
!= NULL
) {
1050 if (light_tempo
== 0 && ((lcd_flags
& LCD_FLAG_L
) == 0))
1052 light_tempo
= FLASH_LIGHT_TEMPO
;
1056 case 'f': /* Small Font */
1057 lcd_flags
&= ~LCD_FLAG_F
;
1060 case 'F': /* Large Font */
1061 lcd_flags
|= LCD_FLAG_F
;
1064 case 'n': /* One Line */
1065 lcd_flags
&= ~LCD_FLAG_N
;
1068 case 'N': /* Two Lines */
1069 lcd_flags
|= LCD_FLAG_N
;
1071 case 'l': /* Shift Cursor Left */
1072 if (lcd_addr_x
> 0) {
1073 /* back one char if not at end of line */
1074 if (lcd_addr_x
< lcd_bwidth
)
1075 lcd_write_cmd(0x10);
1080 case 'r': /* shift cursor right */
1081 if (lcd_addr_x
< lcd_width
) {
1082 /* allow the cursor to pass the end of the line */
1085 lcd_write_cmd(0x14);
1090 case 'L': /* shift display left */
1092 lcd_write_cmd(0x18);
1095 case 'R': /* shift display right */
1097 lcd_write_cmd(0x1C);
1100 case 'k': { /* kill end of line */
1102 for (x
= lcd_addr_x
; x
< lcd_bwidth
; x
++)
1103 lcd_write_data(' ');
1105 /* restore cursor position */
1110 case 'I': /* reinitialize display */
1116 /* Generator : LGcxxxxx...xx; must have <c> between '0'
1117 * and '7', representing the numerical ASCII code of the
1118 * redefined character, and <xx...xx> a sequence of 16
1119 * hex digits representing 8 bytes for each character.
1120 * Most LCDs will only use 5 lower bits of the 7 first
1124 unsigned char cgbytes
[8];
1125 unsigned char cgaddr
;
1131 if (strchr(esc
, ';') == NULL
)
1136 cgaddr
= *(esc
++) - '0';
1145 while (*esc
&& cgoffset
< 8) {
1147 if (*esc
>= '0' && *esc
<= '9')
1148 value
|= (*esc
- '0') << shift
;
1149 else if (*esc
>= 'A' && *esc
<= 'Z')
1150 value
|= (*esc
- 'A' + 10) << shift
;
1151 else if (*esc
>= 'a' && *esc
<= 'z')
1152 value
|= (*esc
- 'a' + 10) << shift
;
1159 cgbytes
[cgoffset
++] = value
;
1166 lcd_write_cmd(0x40 | (cgaddr
* 8));
1167 for (addr
= 0; addr
< cgoffset
; addr
++)
1168 lcd_write_data(cgbytes
[addr
]);
1170 /* ensures that we stop writing to CGRAM */
1175 case 'x': /* gotoxy : LxXXX[yYYY]; */
1176 case 'y': /* gotoxy : LyYYY[xXXX]; */
1177 if (strchr(esc
, ';') == NULL
)
1183 if (kstrtoul(esc
, 10, &lcd_addr_x
) < 0)
1185 } else if (*esc
== 'y') {
1187 if (kstrtoul(esc
, 10, &lcd_addr_y
) < 0)
1198 /* Check wether one flag was changed */
1199 if (oldflags
!= lcd_flags
) {
1200 /* check whether one of B,C,D flags were changed */
1201 if ((oldflags
^ lcd_flags
) &
1202 (LCD_FLAG_B
| LCD_FLAG_C
| LCD_FLAG_D
))
1203 /* set display mode */
1205 | ((lcd_flags
& LCD_FLAG_D
) ? 4 : 0)
1206 | ((lcd_flags
& LCD_FLAG_C
) ? 2 : 0)
1207 | ((lcd_flags
& LCD_FLAG_B
) ? 1 : 0));
1208 /* check whether one of F,N flags was changed */
1209 else if ((oldflags
^ lcd_flags
) & (LCD_FLAG_F
| LCD_FLAG_N
))
1211 | ((lcd_flags
& LCD_FLAG_F
) ? 4 : 0)
1212 | ((lcd_flags
& LCD_FLAG_N
) ? 8 : 0));
1213 /* check wether L flag was changed */
1214 else if ((oldflags
^ lcd_flags
) & (LCD_FLAG_L
)) {
1215 if (lcd_flags
& (LCD_FLAG_L
))
1217 else if (light_tempo
== 0)
1218 /* switch off the light only when the tempo
1227 static ssize_t
lcd_write(struct file
*file
,
1228 const char *buf
, size_t count
, loff_t
*ppos
)
1230 const char *tmp
= buf
;
1233 for (; count
-- > 0; (ppos
? (*ppos
)++ : 0), ++tmp
) {
1234 if (!in_interrupt() && (((count
+ 1) & 0x1f) == 0))
1235 /* let's be a little nice with other processes
1236 that need some CPU */
1239 if (ppos
== NULL
&& file
== NULL
)
1240 /* let's not use get_user() from the kernel ! */
1242 else if (get_user(c
, tmp
))
1245 /* first, we'll test if we're in escape mode */
1246 if ((c
!= '\n') && lcd_escape_len
>= 0) {
1247 /* yes, let's add this char to the buffer */
1248 lcd_escape
[lcd_escape_len
++] = c
;
1249 lcd_escape
[lcd_escape_len
] = 0;
1251 /* aborts any previous escape sequence */
1252 lcd_escape_len
= -1;
1255 case LCD_ESCAPE_CHAR
:
1256 /* start of an escape sequence */
1258 lcd_escape
[lcd_escape_len
] = 0;
1261 /* go back one char and clear it */
1262 if (lcd_addr_x
> 0) {
1263 /* check if we're not at the
1265 if (lcd_addr_x
< lcd_bwidth
)
1267 lcd_write_cmd(0x10);
1270 /* replace with a space */
1271 lcd_write_data(' ');
1272 /* back one char again */
1273 lcd_write_cmd(0x10);
1276 /* quickly clear the display */
1280 /* flush the remainder of the current line and
1281 go to the beginning of the next line */
1282 for (; lcd_addr_x
< lcd_bwidth
; lcd_addr_x
++)
1283 lcd_write_data(' ');
1285 lcd_addr_y
= (lcd_addr_y
+ 1) % lcd_height
;
1289 /* go to the beginning of the same line */
1294 /* print a space instead of the tab */
1298 /* simply print this char */
1304 /* now we'll see if we're in an escape mode and if the current
1305 escape sequence can be understood. */
1306 if (lcd_escape_len
>= 2) {
1309 if (!strcmp(lcd_escape
, "[2J")) {
1310 /* clear the display */
1313 } else if (!strcmp(lcd_escape
, "[H")) {
1314 /* cursor to home */
1315 lcd_addr_x
= lcd_addr_y
= 0;
1319 /* codes starting with ^[[L */
1320 else if ((lcd_escape_len
>= 3) &&
1321 (lcd_escape
[0] == '[') &&
1322 (lcd_escape
[1] == 'L')) {
1323 processed
= handle_lcd_special_code();
1326 /* LCD special escape codes */
1327 /* flush the escape sequence if it's been processed
1328 or if it is getting too long. */
1329 if (processed
|| (lcd_escape_len
>= LCD_ESCAPE_LEN
))
1330 lcd_escape_len
= -1;
1331 } /* escape codes */
1337 static int lcd_open(struct inode
*inode
, struct file
*file
)
1340 return -EBUSY
; /* open only once at a time */
1342 if (file
->f_mode
& FMODE_READ
) /* device is write-only */
1345 if (lcd_must_clear
) {
1346 lcd_clear_display();
1350 return nonseekable_open(inode
, file
);
1353 static int lcd_release(struct inode
*inode
, struct file
*file
)
1359 static const struct file_operations lcd_fops
= {
1362 .release
= lcd_release
,
1363 .llseek
= no_llseek
,
1366 static struct miscdevice lcd_dev
= {
1372 /* public function usable from the kernel for any purpose */
1373 void panel_lcd_print(char *s
)
1375 if (lcd_enabled
&& lcd_initialized
)
1376 lcd_write(NULL
, s
, strlen(s
), NULL
);
1379 /* initialize the LCD driver */
1384 /* parallel mode, 8 bits */
1386 lcd_proto
= LCD_PROTO_PARALLEL
;
1387 if (lcd_charset
< 0)
1388 lcd_charset
= LCD_CHARSET_NORMAL
;
1389 if (lcd_e_pin
== PIN_NOT_SET
)
1390 lcd_e_pin
= PIN_STROBE
;
1391 if (lcd_rs_pin
== PIN_NOT_SET
)
1392 lcd_rs_pin
= PIN_AUTOLF
;
1403 case LCD_TYPE_KS0074
:
1404 /* serial mode, ks0074 */
1406 lcd_proto
= LCD_PROTO_SERIAL
;
1407 if (lcd_charset
< 0)
1408 lcd_charset
= LCD_CHARSET_KS0074
;
1409 if (lcd_bl_pin
== PIN_NOT_SET
)
1410 lcd_bl_pin
= PIN_AUTOLF
;
1411 if (lcd_cl_pin
== PIN_NOT_SET
)
1412 lcd_cl_pin
= PIN_STROBE
;
1413 if (lcd_da_pin
== PIN_NOT_SET
)
1414 lcd_da_pin
= PIN_D0
;
1425 case LCD_TYPE_NEXCOM
:
1426 /* parallel mode, 8 bits, generic */
1428 lcd_proto
= LCD_PROTO_PARALLEL
;
1429 if (lcd_charset
< 0)
1430 lcd_charset
= LCD_CHARSET_NORMAL
;
1431 if (lcd_e_pin
== PIN_NOT_SET
)
1432 lcd_e_pin
= PIN_AUTOLF
;
1433 if (lcd_rs_pin
== PIN_NOT_SET
)
1434 lcd_rs_pin
= PIN_SELECP
;
1435 if (lcd_rw_pin
== PIN_NOT_SET
)
1436 lcd_rw_pin
= PIN_INITP
;
1447 case LCD_TYPE_CUSTOM
:
1448 /* customer-defined */
1450 lcd_proto
= DEFAULT_LCD_PROTO
;
1451 if (lcd_charset
< 0)
1452 lcd_charset
= DEFAULT_LCD_CHARSET
;
1453 /* default geometry will be set later */
1455 case LCD_TYPE_HANTRONIX
:
1456 /* parallel mode, 8 bits, hantronix-like */
1459 lcd_proto
= LCD_PROTO_PARALLEL
;
1460 if (lcd_charset
< 0)
1461 lcd_charset
= LCD_CHARSET_NORMAL
;
1462 if (lcd_e_pin
== PIN_NOT_SET
)
1463 lcd_e_pin
= PIN_STROBE
;
1464 if (lcd_rs_pin
== PIN_NOT_SET
)
1465 lcd_rs_pin
= PIN_SELECP
;
1478 /* this is used to catch wrong and default values */
1480 lcd_width
= DEFAULT_LCD_WIDTH
;
1481 if (lcd_bwidth
<= 0)
1482 lcd_bwidth
= DEFAULT_LCD_BWIDTH
;
1483 if (lcd_hwidth
<= 0)
1484 lcd_hwidth
= DEFAULT_LCD_HWIDTH
;
1485 if (lcd_height
<= 0)
1486 lcd_height
= DEFAULT_LCD_HEIGHT
;
1488 if (lcd_proto
== LCD_PROTO_SERIAL
) { /* SERIAL */
1489 lcd_write_cmd
= lcd_write_cmd_s
;
1490 lcd_write_data
= lcd_write_data_s
;
1491 lcd_clear_fast
= lcd_clear_fast_s
;
1493 if (lcd_cl_pin
== PIN_NOT_SET
)
1494 lcd_cl_pin
= DEFAULT_LCD_PIN_SCL
;
1495 if (lcd_da_pin
== PIN_NOT_SET
)
1496 lcd_da_pin
= DEFAULT_LCD_PIN_SDA
;
1498 } else if (lcd_proto
== LCD_PROTO_PARALLEL
) { /* PARALLEL */
1499 lcd_write_cmd
= lcd_write_cmd_p8
;
1500 lcd_write_data
= lcd_write_data_p8
;
1501 lcd_clear_fast
= lcd_clear_fast_p8
;
1503 if (lcd_e_pin
== PIN_NOT_SET
)
1504 lcd_e_pin
= DEFAULT_LCD_PIN_E
;
1505 if (lcd_rs_pin
== PIN_NOT_SET
)
1506 lcd_rs_pin
= DEFAULT_LCD_PIN_RS
;
1507 if (lcd_rw_pin
== PIN_NOT_SET
)
1508 lcd_rw_pin
= DEFAULT_LCD_PIN_RW
;
1510 lcd_write_cmd
= lcd_write_cmd_tilcd
;
1511 lcd_write_data
= lcd_write_data_tilcd
;
1512 lcd_clear_fast
= lcd_clear_fast_tilcd
;
1515 if (lcd_bl_pin
== PIN_NOT_SET
)
1516 lcd_bl_pin
= DEFAULT_LCD_PIN_BL
;
1518 if (lcd_e_pin
== PIN_NOT_SET
)
1519 lcd_e_pin
= PIN_NONE
;
1520 if (lcd_rs_pin
== PIN_NOT_SET
)
1521 lcd_rs_pin
= PIN_NONE
;
1522 if (lcd_rw_pin
== PIN_NOT_SET
)
1523 lcd_rw_pin
= PIN_NONE
;
1524 if (lcd_bl_pin
== PIN_NOT_SET
)
1525 lcd_bl_pin
= PIN_NONE
;
1526 if (lcd_cl_pin
== PIN_NOT_SET
)
1527 lcd_cl_pin
= PIN_NONE
;
1528 if (lcd_da_pin
== PIN_NOT_SET
)
1529 lcd_da_pin
= PIN_NONE
;
1531 if (lcd_charset
< 0)
1532 lcd_charset
= DEFAULT_LCD_CHARSET
;
1534 if (lcd_charset
== LCD_CHARSET_KS0074
)
1535 lcd_char_conv
= lcd_char_conv_ks0074
;
1537 lcd_char_conv
= NULL
;
1539 if (lcd_bl_pin
!= PIN_NONE
)
1542 pin_to_bits(lcd_e_pin
, lcd_bits
[LCD_PORT_D
][LCD_BIT_E
],
1543 lcd_bits
[LCD_PORT_C
][LCD_BIT_E
]);
1544 pin_to_bits(lcd_rs_pin
, lcd_bits
[LCD_PORT_D
][LCD_BIT_RS
],
1545 lcd_bits
[LCD_PORT_C
][LCD_BIT_RS
]);
1546 pin_to_bits(lcd_rw_pin
, lcd_bits
[LCD_PORT_D
][LCD_BIT_RW
],
1547 lcd_bits
[LCD_PORT_C
][LCD_BIT_RW
]);
1548 pin_to_bits(lcd_bl_pin
, lcd_bits
[LCD_PORT_D
][LCD_BIT_BL
],
1549 lcd_bits
[LCD_PORT_C
][LCD_BIT_BL
]);
1550 pin_to_bits(lcd_cl_pin
, lcd_bits
[LCD_PORT_D
][LCD_BIT_CL
],
1551 lcd_bits
[LCD_PORT_C
][LCD_BIT_CL
]);
1552 pin_to_bits(lcd_da_pin
, lcd_bits
[LCD_PORT_D
][LCD_BIT_DA
],
1553 lcd_bits
[LCD_PORT_C
][LCD_BIT_DA
]);
1555 /* before this line, we must NOT send anything to the display.
1556 * Since lcd_init_display() needs to write data, we have to
1557 * enable mark the LCD initialized just before. */
1558 lcd_initialized
= 1;
1561 /* display a short message */
1562 #ifdef CONFIG_PANEL_CHANGE_MESSAGE
1563 #ifdef CONFIG_PANEL_BOOT_MESSAGE
1564 panel_lcd_print("\x1b[Lc\x1b[Lb\x1b[L*" CONFIG_PANEL_BOOT_MESSAGE
);
1567 panel_lcd_print("\x1b[Lc\x1b[Lb\x1b[L*Linux-" UTS_RELEASE
"\nPanel-"
1570 lcd_addr_x
= lcd_addr_y
= 0;
1571 /* clear the display on the next device opening */
1577 * These are the file operation function for user access to /dev/keypad
1580 static ssize_t
keypad_read(struct file
*file
,
1581 char *buf
, size_t count
, loff_t
*ppos
)
1587 if (keypad_buflen
== 0) {
1588 if (file
->f_flags
& O_NONBLOCK
)
1591 interruptible_sleep_on(&keypad_read_wait
);
1592 if (signal_pending(current
))
1596 for (; count
-- > 0 && (keypad_buflen
> 0);
1597 ++i
, ++tmp
, --keypad_buflen
) {
1598 put_user(keypad_buffer
[keypad_start
], tmp
);
1599 keypad_start
= (keypad_start
+ 1) % KEYPAD_BUFFER
;
1606 static int keypad_open(struct inode
*inode
, struct file
*file
)
1609 if (keypad_open_cnt
)
1610 return -EBUSY
; /* open only once at a time */
1612 if (file
->f_mode
& FMODE_WRITE
) /* device is read-only */
1615 keypad_buflen
= 0; /* flush the buffer on opening */
1620 static int keypad_release(struct inode
*inode
, struct file
*file
)
1626 static const struct file_operations keypad_fops
= {
1627 .read
= keypad_read
, /* read */
1628 .open
= keypad_open
, /* open */
1629 .release
= keypad_release
, /* close */
1630 .llseek
= default_llseek
,
1633 static struct miscdevice keypad_dev
= {
1639 static void keypad_send_key(char *string
, int max_len
)
1641 if (init_in_progress
)
1644 /* send the key to the device only if a process is attached to it. */
1645 if (keypad_open_cnt
> 0) {
1646 while (max_len
-- && keypad_buflen
< KEYPAD_BUFFER
&& *string
) {
1647 keypad_buffer
[(keypad_start
+ keypad_buflen
++) %
1648 KEYPAD_BUFFER
] = *string
++;
1650 wake_up_interruptible(&keypad_read_wait
);
1654 /* this function scans all the bits involving at least one logical signal,
1655 * and puts the results in the bitfield "phys_read" (one bit per established
1656 * contact), and sets "phys_read_prev" to "phys_read".
1658 * Note: to debounce input signals, we will only consider as switched a signal
1659 * which is stable across 2 measures. Signals which are different between two
1660 * reads will be kept as they previously were in their logical form (phys_prev).
1661 * A signal which has just switched will have a 1 in
1662 * (phys_read ^ phys_read_prev).
1664 static void phys_scan_contacts(void)
1671 phys_prev
= phys_curr
;
1672 phys_read_prev
= phys_read
;
1673 phys_read
= 0; /* flush all signals */
1675 /* keep track of old value, with all outputs disabled */
1676 oldval
= r_dtr(pprt
) | scan_mask_o
;
1677 /* activate all keyboard outputs (active low) */
1678 w_dtr(pprt
, oldval
& ~scan_mask_o
);
1680 /* will have a 1 for each bit set to gnd */
1681 bitmask
= PNL_PINPUT(r_str(pprt
)) & scan_mask_i
;
1682 /* disable all matrix signals */
1683 w_dtr(pprt
, oldval
);
1685 /* now that all outputs are cleared, the only active input bits are
1686 * directly connected to the ground
1689 /* 1 for each grounded input */
1690 gndmask
= PNL_PINPUT(r_str(pprt
)) & scan_mask_i
;
1692 /* grounded inputs are signals 40-44 */
1693 phys_read
|= (pmask_t
) gndmask
<< 40;
1695 if (bitmask
!= gndmask
) {
1696 /* since clearing the outputs changed some inputs, we know
1697 * that some input signals are currently tied to some outputs.
1698 * So we'll scan them.
1700 for (bit
= 0; bit
< 8; bit
++) {
1703 if (!(scan_mask_o
& bitval
)) /* skip unused bits */
1706 w_dtr(pprt
, oldval
& ~bitval
); /* enable this output */
1707 bitmask
= PNL_PINPUT(r_str(pprt
)) & ~gndmask
;
1708 phys_read
|= (pmask_t
) bitmask
<< (5 * bit
);
1710 w_dtr(pprt
, oldval
); /* disable all outputs */
1712 /* this is easy: use old bits when they are flapping,
1713 * use new ones when stable */
1714 phys_curr
= (phys_prev
& (phys_read
^ phys_read_prev
)) |
1715 (phys_read
& ~(phys_read
^ phys_read_prev
));
1718 static inline int input_state_high(struct logical_input
*input
)
1722 * this is an invalid test. It tries to catch
1723 * transitions from single-key to multiple-key, but
1724 * doesn't take into account the contacts polarity.
1725 * The only solution to the problem is to parse keys
1726 * from the most complex to the simplest combinations,
1727 * and mark them as 'caught' once a combination
1728 * matches, then unmatch it for all other ones.
1731 /* try to catch dangerous transitions cases :
1732 * someone adds a bit, so this signal was a false
1733 * positive resulting from a transition. We should
1734 * invalidate the signal immediately and not call the
1736 * eg: 0 -(press A)-> A -(press B)-> AB : don't match A's release.
1738 if (((phys_prev
& input
->mask
) == input
->value
)
1739 && ((phys_curr
& input
->mask
) > input
->value
)) {
1740 input
->state
= INPUT_ST_LOW
; /* invalidate */
1745 if ((phys_curr
& input
->mask
) == input
->value
) {
1746 if ((input
->type
== INPUT_TYPE_STD
) &&
1747 (input
->high_timer
== 0)) {
1748 input
->high_timer
++;
1749 if (input
->u
.std
.press_fct
!= NULL
)
1750 input
->u
.std
.press_fct(input
->u
.std
.press_data
);
1751 } else if (input
->type
== INPUT_TYPE_KBD
) {
1752 /* will turn on the light */
1755 if (input
->high_timer
== 0) {
1756 char *press_str
= input
->u
.kbd
.press_str
;
1758 keypad_send_key(press_str
,
1762 if (input
->u
.kbd
.repeat_str
[0]) {
1763 char *repeat_str
= input
->u
.kbd
.repeat_str
;
1764 if (input
->high_timer
>= KEYPAD_REP_START
) {
1765 input
->high_timer
-= KEYPAD_REP_DELAY
;
1766 keypad_send_key(repeat_str
,
1767 sizeof(repeat_str
));
1769 /* we will need to come back here soon */
1773 if (input
->high_timer
< 255)
1774 input
->high_timer
++;
1778 /* else signal falling down. Let's fall through. */
1779 input
->state
= INPUT_ST_FALLING
;
1780 input
->fall_timer
= 0;
1785 static inline void input_state_falling(struct logical_input
*input
)
1788 /* FIXME !!! same comment as in input_state_high */
1789 if (((phys_prev
& input
->mask
) == input
->value
)
1790 && ((phys_curr
& input
->mask
) > input
->value
)) {
1791 input
->state
= INPUT_ST_LOW
; /* invalidate */
1796 if ((phys_curr
& input
->mask
) == input
->value
) {
1797 if (input
->type
== INPUT_TYPE_KBD
) {
1798 /* will turn on the light */
1801 if (input
->u
.kbd
.repeat_str
[0]) {
1802 char *repeat_str
= input
->u
.kbd
.repeat_str
;
1803 if (input
->high_timer
>= KEYPAD_REP_START
)
1804 input
->high_timer
-= KEYPAD_REP_DELAY
;
1805 keypad_send_key(repeat_str
,
1806 sizeof(repeat_str
));
1807 /* we will need to come back here soon */
1811 if (input
->high_timer
< 255)
1812 input
->high_timer
++;
1814 input
->state
= INPUT_ST_HIGH
;
1815 } else if (input
->fall_timer
>= input
->fall_time
) {
1816 /* call release event */
1817 if (input
->type
== INPUT_TYPE_STD
) {
1818 void (*release_fct
)(int) = input
->u
.std
.release_fct
;
1819 if (release_fct
!= NULL
)
1820 release_fct(input
->u
.std
.release_data
);
1821 } else if (input
->type
== INPUT_TYPE_KBD
) {
1822 char *release_str
= input
->u
.kbd
.release_str
;
1824 keypad_send_key(release_str
,
1825 sizeof(release_str
));
1828 input
->state
= INPUT_ST_LOW
;
1830 input
->fall_timer
++;
1835 static void panel_process_inputs(void)
1837 struct list_head
*item
;
1838 struct logical_input
*input
;
1842 "entering panel_process_inputs with pp=%016Lx & pc=%016Lx\n",
1843 phys_prev
, phys_curr
);
1848 list_for_each(item
, &logical_inputs
) {
1849 input
= list_entry(item
, struct logical_input
, list
);
1851 switch (input
->state
) {
1853 if ((phys_curr
& input
->mask
) != input
->value
)
1855 /* if all needed ones were already set previously,
1856 * this means that this logical signal has been
1857 * activated by the releasing of another combined
1858 * signal, so we don't want to match.
1859 * eg: AB -(release B)-> A -(release A)-> 0 :
1862 if ((phys_prev
& input
->mask
) == input
->value
)
1864 input
->rise_timer
= 0;
1865 input
->state
= INPUT_ST_RISING
;
1866 /* no break here, fall through */
1867 case INPUT_ST_RISING
:
1868 if ((phys_curr
& input
->mask
) != input
->value
) {
1869 input
->state
= INPUT_ST_LOW
;
1872 if (input
->rise_timer
< input
->rise_time
) {
1874 input
->rise_timer
++;
1877 input
->high_timer
= 0;
1878 input
->state
= INPUT_ST_HIGH
;
1879 /* no break here, fall through */
1881 if (input_state_high(input
))
1883 /* no break here, fall through */
1884 case INPUT_ST_FALLING
:
1885 input_state_falling(input
);
1890 static void panel_scan_timer(void)
1892 if (keypad_enabled
&& keypad_initialized
) {
1893 if (spin_trylock(&pprt_lock
)) {
1894 phys_scan_contacts();
1896 /* no need for the parport anymore */
1897 spin_unlock(&pprt_lock
);
1900 if (!inputs_stable
|| phys_curr
!= phys_prev
)
1901 panel_process_inputs();
1904 if (lcd_enabled
&& lcd_initialized
) {
1906 if (light_tempo
== 0 && ((lcd_flags
& LCD_FLAG_L
) == 0))
1908 light_tempo
= FLASH_LIGHT_TEMPO
;
1909 } else if (light_tempo
> 0) {
1911 if (light_tempo
== 0 && ((lcd_flags
& LCD_FLAG_L
) == 0))
1916 mod_timer(&scan_timer
, jiffies
+ INPUT_POLL_TIME
);
1919 static void init_scan_timer(void)
1921 if (scan_timer
.function
!= NULL
)
1922 return; /* already started */
1924 init_timer(&scan_timer
);
1925 scan_timer
.expires
= jiffies
+ INPUT_POLL_TIME
;
1926 scan_timer
.data
= 0;
1927 scan_timer
.function
= (void *)&panel_scan_timer
;
1928 add_timer(&scan_timer
);
1931 /* converts a name of the form "({BbAaPpSsEe}{01234567-})*" to a series of bits.
1932 * if <omask> or <imask> are non-null, they will be or'ed with the bits
1933 * corresponding to out and in bits respectively.
1934 * returns 1 if ok, 0 if error (in which case, nothing is written).
1936 static int input_name2mask(char *name
, pmask_t
*mask
, pmask_t
*value
,
1937 char *imask
, char *omask
)
1939 static char sigtab
[10] = "EeSsPpAaBb";
1943 om
= im
= m
= v
= 0ULL;
1945 int in
, out
, bit
, neg
;
1946 for (in
= 0; (in
< sizeof(sigtab
)) &&
1947 (sigtab
[in
] != *name
); in
++)
1949 if (in
>= sizeof(sigtab
))
1950 return 0; /* input name not found */
1951 neg
= (in
& 1); /* odd (lower) names are negated */
1956 if (isdigit(*name
)) {
1959 } else if (*name
== '-')
1962 return 0; /* unknown bit name */
1964 bit
= (out
* 5) + in
;
1980 /* tries to bind a key to the signal name <name>. The key will send the
1981 * strings <press>, <repeat>, <release> for these respective events.
1982 * Returns the pointer to the new key if ok, NULL if the key could not be bound.
1984 static struct logical_input
*panel_bind_key(char *name
, char *press
,
1985 char *repeat
, char *release
)
1987 struct logical_input
*key
;
1989 key
= kzalloc(sizeof(struct logical_input
), GFP_KERNEL
);
1991 printk(KERN_ERR
"panel: not enough memory\n");
1994 if (!input_name2mask(name
, &key
->mask
, &key
->value
, &scan_mask_i
,
2000 key
->type
= INPUT_TYPE_KBD
;
2001 key
->state
= INPUT_ST_LOW
;
2006 printk(KERN_DEBUG
"bind: <%s> : m=%016Lx v=%016Lx\n", name
, key
->mask
,
2009 strncpy(key
->u
.kbd
.press_str
, press
, sizeof(key
->u
.kbd
.press_str
));
2010 strncpy(key
->u
.kbd
.repeat_str
, repeat
, sizeof(key
->u
.kbd
.repeat_str
));
2011 strncpy(key
->u
.kbd
.release_str
, release
,
2012 sizeof(key
->u
.kbd
.release_str
));
2013 list_add(&key
->list
, &logical_inputs
);
2018 /* tries to bind a callback function to the signal name <name>. The function
2019 * <press_fct> will be called with the <press_data> arg when the signal is
2020 * activated, and so on for <release_fct>/<release_data>
2021 * Returns the pointer to the new signal if ok, NULL if the signal could not
2024 static struct logical_input
*panel_bind_callback(char *name
,
2025 void (*press_fct
) (int),
2027 void (*release_fct
) (int),
2030 struct logical_input
*callback
;
2032 callback
= kmalloc(sizeof(struct logical_input
), GFP_KERNEL
);
2034 printk(KERN_ERR
"panel: not enough memory\n");
2037 memset(callback
, 0, sizeof(struct logical_input
));
2038 if (!input_name2mask(name
, &callback
->mask
, &callback
->value
,
2039 &scan_mask_i
, &scan_mask_o
))
2042 callback
->type
= INPUT_TYPE_STD
;
2043 callback
->state
= INPUT_ST_LOW
;
2044 callback
->rise_time
= 1;
2045 callback
->fall_time
= 1;
2046 callback
->u
.std
.press_fct
= press_fct
;
2047 callback
->u
.std
.press_data
= press_data
;
2048 callback
->u
.std
.release_fct
= release_fct
;
2049 callback
->u
.std
.release_data
= release_data
;
2050 list_add(&callback
->list
, &logical_inputs
);
2055 static void keypad_init(void)
2058 init_waitqueue_head(&keypad_read_wait
);
2059 keypad_buflen
= 0; /* flushes any eventual noisy keystroke */
2061 /* Let's create all known keys */
2063 for (keynum
= 0; keypad_profile
[keynum
][0][0]; keynum
++) {
2064 panel_bind_key(keypad_profile
[keynum
][0],
2065 keypad_profile
[keynum
][1],
2066 keypad_profile
[keynum
][2],
2067 keypad_profile
[keynum
][3]);
2071 keypad_initialized
= 1;
2074 /**************************************************/
2075 /* device initialization */
2076 /**************************************************/
2078 static int panel_notify_sys(struct notifier_block
*this, unsigned long code
,
2081 if (lcd_enabled
&& lcd_initialized
) {
2085 ("\x0cReloading\nSystem...\x1b[Lc\x1b[Lb\x1b[L+");
2089 ("\x0cSystem Halted.\x1b[Lc\x1b[Lb\x1b[L+");
2092 panel_lcd_print("\x0cPower off.\x1b[Lc\x1b[Lb\x1b[L+");
2101 static struct notifier_block panel_notifier
= {
2107 static void panel_attach(struct parport
*port
)
2109 if (port
->number
!= parport
)
2114 "panel_attach(): port->number=%d parport=%d, "
2115 "already registered !\n",
2116 port
->number
, parport
);
2120 pprt
= parport_register_device(port
, "panel", NULL
, NULL
, /* pf, kf */
2122 /*PARPORT_DEV_EXCL */
2125 pr_err("panel_attach(): port->number=%d parport=%d, "
2126 "parport_register_device() failed\n",
2127 port
->number
, parport
);
2131 if (parport_claim(pprt
)) {
2133 "Panel: could not claim access to parport%d. "
2134 "Aborting.\n", parport
);
2135 goto err_unreg_device
;
2138 /* must init LCD first, just in case an IRQ from the keypad is
2139 * generated at keypad init
2143 if (misc_register(&lcd_dev
))
2144 goto err_unreg_device
;
2147 if (keypad_enabled
) {
2149 if (misc_register(&keypad_dev
))
2156 misc_deregister(&lcd_dev
);
2158 parport_unregister_device(pprt
);
2162 static void panel_detach(struct parport
*port
)
2164 if (port
->number
!= parport
)
2169 "panel_detach(): port->number=%d parport=%d, "
2170 "nothing to unregister.\n",
2171 port
->number
, parport
);
2175 if (keypad_enabled
&& keypad_initialized
) {
2176 misc_deregister(&keypad_dev
);
2177 keypad_initialized
= 0;
2180 if (lcd_enabled
&& lcd_initialized
) {
2181 misc_deregister(&lcd_dev
);
2182 lcd_initialized
= 0;
2185 parport_release(pprt
);
2186 parport_unregister_device(pprt
);
2190 static struct parport_driver panel_driver
= {
2192 .attach
= panel_attach
,
2193 .detach
= panel_detach
,
2197 int panel_init(void)
2199 /* for backwards compatibility */
2200 if (keypad_type
< 0)
2201 keypad_type
= keypad_enabled
;
2204 lcd_type
= lcd_enabled
;
2207 parport
= DEFAULT_PARPORT
;
2209 /* take care of an eventual profile */
2211 case PANEL_PROFILE_CUSTOM
:
2212 /* custom profile */
2213 if (keypad_type
< 0)
2214 keypad_type
= DEFAULT_KEYPAD
;
2216 lcd_type
= DEFAULT_LCD
;
2218 case PANEL_PROFILE_OLD
:
2219 /* 8 bits, 2*16, old keypad */
2220 if (keypad_type
< 0)
2221 keypad_type
= KEYPAD_TYPE_OLD
;
2223 lcd_type
= LCD_TYPE_OLD
;
2229 case PANEL_PROFILE_NEW
:
2230 /* serial, 2*16, new keypad */
2231 if (keypad_type
< 0)
2232 keypad_type
= KEYPAD_TYPE_NEW
;
2234 lcd_type
= LCD_TYPE_KS0074
;
2236 case PANEL_PROFILE_HANTRONIX
:
2237 /* 8 bits, 2*16 hantronix-like, no keypad */
2238 if (keypad_type
< 0)
2239 keypad_type
= KEYPAD_TYPE_NONE
;
2241 lcd_type
= LCD_TYPE_HANTRONIX
;
2243 case PANEL_PROFILE_NEXCOM
:
2244 /* generic 8 bits, 2*16, nexcom keypad, eg. Nexcom. */
2245 if (keypad_type
< 0)
2246 keypad_type
= KEYPAD_TYPE_NEXCOM
;
2248 lcd_type
= LCD_TYPE_NEXCOM
;
2250 case PANEL_PROFILE_LARGE
:
2251 /* 8 bits, 2*40, old keypad */
2252 if (keypad_type
< 0)
2253 keypad_type
= KEYPAD_TYPE_OLD
;
2255 lcd_type
= LCD_TYPE_OLD
;
2259 lcd_enabled
= (lcd_type
> 0);
2260 keypad_enabled
= (keypad_type
> 0);
2262 switch (keypad_type
) {
2263 case KEYPAD_TYPE_OLD
:
2264 keypad_profile
= old_keypad_profile
;
2266 case KEYPAD_TYPE_NEW
:
2267 keypad_profile
= new_keypad_profile
;
2269 case KEYPAD_TYPE_NEXCOM
:
2270 keypad_profile
= nexcom_keypad_profile
;
2273 keypad_profile
= NULL
;
2277 /* tells various subsystems about the fact that we are initializing */
2278 init_in_progress
= 1;
2280 if (parport_register_driver(&panel_driver
)) {
2282 "Panel: could not register with parport. Aborting.\n");
2286 if (!lcd_enabled
&& !keypad_enabled
) {
2287 /* no device enabled, let's release the parport */
2289 parport_release(pprt
);
2290 parport_unregister_device(pprt
);
2293 parport_unregister_driver(&panel_driver
);
2294 printk(KERN_ERR
"Panel driver version " PANEL_VERSION
2299 register_reboot_notifier(&panel_notifier
);
2302 printk(KERN_INFO
"Panel driver version " PANEL_VERSION
2303 " registered on parport%d (io=0x%lx).\n", parport
,
2306 printk(KERN_INFO
"Panel driver version " PANEL_VERSION
2307 " not yet registered\n");
2308 /* tells various subsystems about the fact that initialization
2310 init_in_progress
= 0;
2314 static int __init
panel_init_module(void)
2316 return panel_init();
2319 static void __exit
panel_cleanup_module(void)
2321 unregister_reboot_notifier(&panel_notifier
);
2323 if (scan_timer
.function
!= NULL
)
2324 del_timer(&scan_timer
);
2327 if (keypad_enabled
) {
2328 misc_deregister(&keypad_dev
);
2329 keypad_initialized
= 0;
2333 panel_lcd_print("\x0cLCD driver " PANEL_VERSION
2334 "\nunloaded.\x1b[Lc\x1b[Lb\x1b[L-");
2335 misc_deregister(&lcd_dev
);
2336 lcd_initialized
= 0;
2339 /* TODO: free all input signals */
2340 parport_release(pprt
);
2341 parport_unregister_device(pprt
);
2344 parport_unregister_driver(&panel_driver
);
2347 module_init(panel_init_module
);
2348 module_exit(panel_cleanup_module
);
2349 MODULE_AUTHOR("Willy Tarreau");
2350 MODULE_LICENSE("GPL");