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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39 #include <linux/module.h>
41 #include <linux/types.h>
42 #include <linux/errno.h>
43 #include <linux/signal.h>
44 #include <linux/sched.h>
45 #include <linux/spinlock.h>
46 #include <linux/interrupt.h>
47 #include <linux/miscdevice.h>
48 #include <linux/slab.h>
49 #include <linux/ioport.h>
50 #include <linux/fcntl.h>
51 #include <linux/init.h>
52 #include <linux/delay.h>
53 #include <linux/kernel.h>
54 #include <linux/ctype.h>
55 #include <linux/parport.h>
56 #include <linux/list.h>
57 #include <linux/notifier.h>
58 #include <linux/reboot.h>
59 #include <generated/utsrelease.h>
62 #include <linux/uaccess.h>
65 #define KEYPAD_MINOR 185
67 #define PANEL_VERSION "0.9.5"
69 #define LCD_MAXBYTES 256 /* max burst write */
71 #define KEYPAD_BUFFER 64
73 /* poll the keyboard this every second */
74 #define INPUT_POLL_TIME (HZ/50)
75 /* a key starts to repeat after this times INPUT_POLL_TIME */
76 #define KEYPAD_REP_START (10)
77 /* a key repeats this times INPUT_POLL_TIME */
78 #define KEYPAD_REP_DELAY (2)
80 /* keep the light on this times INPUT_POLL_TIME for each flash */
81 #define FLASH_LIGHT_TEMPO (200)
83 /* converts an r_str() input to an active high, bits string : 000BAOSE */
84 #define PNL_PINPUT(a) ((((unsigned char)(a)) ^ 0x7F) >> 3)
86 #define PNL_PBUSY 0x80 /* inverted input, active low */
87 #define PNL_PACK 0x40 /* direct input, active low */
88 #define PNL_POUTPA 0x20 /* direct input, active high */
89 #define PNL_PSELECD 0x10 /* direct input, active high */
90 #define PNL_PERRORP 0x08 /* direct input, active low */
92 #define PNL_PBIDIR 0x20 /* bi-directional ports */
93 /* high to read data in or-ed with data out */
94 #define PNL_PINTEN 0x10
95 #define PNL_PSELECP 0x08 /* inverted output, active low */
96 #define PNL_PINITP 0x04 /* direct output, active low */
97 #define PNL_PAUTOLF 0x02 /* inverted output, active low */
98 #define PNL_PSTROBE 0x01 /* inverted output */
119 #define PIN_AUTOLF 14
121 #define PIN_SELECP 17
122 #define PIN_NOT_SET 127
124 #define LCD_FLAG_S 0x0001
125 #define LCD_FLAG_ID 0x0002
126 #define LCD_FLAG_B 0x0004 /* blink on */
127 #define LCD_FLAG_C 0x0008 /* cursor on */
128 #define LCD_FLAG_D 0x0010 /* display on */
129 #define LCD_FLAG_F 0x0020 /* large font mode */
130 #define LCD_FLAG_N 0x0040 /* 2-rows mode */
131 #define LCD_FLAG_L 0x0080 /* backlight enabled */
133 #define LCD_ESCAPE_LEN 24 /* max chars for LCD escape command */
134 #define LCD_ESCAPE_CHAR 27 /* use char 27 for escape command */
136 /* macros to simplify use of the parallel port */
137 #define r_ctr(x) (parport_read_control((x)->port))
138 #define r_dtr(x) (parport_read_data((x)->port))
139 #define r_str(x) (parport_read_status((x)->port))
140 #define w_ctr(x, y) (parport_write_control((x)->port, (y)))
141 #define w_dtr(x, y) (parport_write_data((x)->port, (y)))
143 /* this defines which bits are to be used and which ones to be ignored */
144 /* logical or of the output bits involved in the scan matrix */
145 static __u8 scan_mask_o;
146 /* logical or of the input bits involved in the scan matrix */
147 static __u8 scan_mask_i;
149 typedef __u64 pmask_t;
163 struct logical_input {
164 struct list_head list;
167 enum input_type type;
168 enum input_state state;
169 __u8 rise_time, fall_time;
170 __u8 rise_timer, fall_timer, high_timer;
173 struct { /* valid when type == INPUT_TYPE_STD */
174 void (*press_fct)(int);
175 void (*release_fct)(int);
179 struct { /* valid when type == INPUT_TYPE_KBD */
180 /* strings can be non null-terminated */
181 char press_str[sizeof(void *) + sizeof(int)];
182 char repeat_str[sizeof(void *) + sizeof(int)];
183 char release_str[sizeof(void *) + sizeof(int)];
188 static LIST_HEAD(logical_inputs); /* list of all defined logical inputs */
190 /* physical contacts history
191 * Physical contacts are a 45 bits string of 9 groups of 5 bits each.
192 * The 8 lower groups correspond to output bits 0 to 7, and the 9th group
193 * corresponds to the ground.
194 * Within each group, bits are stored in the same order as read on the port :
195 * BAPSE (busy=4, ack=3, paper empty=2, select=1, error=0).
196 * So, each __u64 (or pmask_t) is represented like this :
197 * 0000000000000000000BAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSE
198 * <-----unused------><gnd><d07><d06><d05><d04><d03><d02><d01><d00>
201 /* what has just been read from the I/O ports */
202 static pmask_t phys_read;
203 /* previous phys_read */
204 static pmask_t phys_read_prev;
205 /* stabilized phys_read (phys_read|phys_read_prev) */
206 static pmask_t phys_curr;
207 /* previous phys_curr */
208 static pmask_t phys_prev;
209 /* 0 means that at least one logical signal needs be computed */
210 static char inputs_stable;
212 /* these variables are specific to the keypad */
213 static char keypad_buffer[KEYPAD_BUFFER];
214 static int keypad_buflen;
215 static int keypad_start;
216 static char keypressed;
217 static wait_queue_head_t keypad_read_wait;
219 /* lcd-specific variables */
221 /* contains the LCD config state */
222 static unsigned long int lcd_flags;
223 /* contains the LCD X offset */
224 static unsigned long int lcd_addr_x;
225 /* contains the LCD Y offset */
226 static unsigned long int lcd_addr_y;
227 /* current escape sequence, 0 terminated */
228 static char lcd_escape[LCD_ESCAPE_LEN + 1];
229 /* not in escape state. >=0 = escape cmd len */
230 static int lcd_escape_len = -1;
233 * Bit masks to convert LCD signals to parallel port outputs.
234 * _d_ are values for data port, _c_ are for control port.
235 * [0] = signal OFF, [1] = signal ON, [2] = mask
242 * one entry for each bit on the LCD
253 * each bit can be either connected to a DATA or CTRL port
259 static unsigned char lcd_bits[LCD_PORTS][LCD_BITS][BIT_STATES];
264 #define LCD_PROTO_PARALLEL 0
265 #define LCD_PROTO_SERIAL 1
266 #define LCD_PROTO_TI_DA8XX_LCD 2
271 #define LCD_CHARSET_NORMAL 0
272 #define LCD_CHARSET_KS0074 1
277 #define LCD_TYPE_NONE 0
278 #define LCD_TYPE_OLD 1
279 #define LCD_TYPE_KS0074 2
280 #define LCD_TYPE_HANTRONIX 3
281 #define LCD_TYPE_NEXCOM 4
282 #define LCD_TYPE_CUSTOM 5
287 #define KEYPAD_TYPE_NONE 0
288 #define KEYPAD_TYPE_OLD 1
289 #define KEYPAD_TYPE_NEW 2
290 #define KEYPAD_TYPE_NEXCOM 3
295 #define PANEL_PROFILE_CUSTOM 0
296 #define PANEL_PROFILE_OLD 1
297 #define PANEL_PROFILE_NEW 2
298 #define PANEL_PROFILE_HANTRONIX 3
299 #define PANEL_PROFILE_NEXCOM 4
300 #define PANEL_PROFILE_LARGE 5
303 * Construct custom config from the kernel's configuration
305 #define DEFAULT_PROFILE PANEL_PROFILE_LARGE
306 #define DEFAULT_PARPORT 0
307 #define DEFAULT_LCD LCD_TYPE_OLD
308 #define DEFAULT_KEYPAD KEYPAD_TYPE_OLD
309 #define DEFAULT_LCD_WIDTH 40
310 #define DEFAULT_LCD_BWIDTH 40
311 #define DEFAULT_LCD_HWIDTH 64
312 #define DEFAULT_LCD_HEIGHT 2
313 #define DEFAULT_LCD_PROTO LCD_PROTO_PARALLEL
315 #define DEFAULT_LCD_PIN_E PIN_AUTOLF
316 #define DEFAULT_LCD_PIN_RS PIN_SELECP
317 #define DEFAULT_LCD_PIN_RW PIN_INITP
318 #define DEFAULT_LCD_PIN_SCL PIN_STROBE
319 #define DEFAULT_LCD_PIN_SDA PIN_D0
320 #define DEFAULT_LCD_PIN_BL PIN_NOT_SET
321 #define DEFAULT_LCD_CHARSET LCD_CHARSET_NORMAL
323 #ifdef CONFIG_PANEL_PROFILE
324 #undef DEFAULT_PROFILE
325 #define DEFAULT_PROFILE CONFIG_PANEL_PROFILE
328 #ifdef CONFIG_PANEL_PARPORT
329 #undef DEFAULT_PARPORT
330 #define DEFAULT_PARPORT CONFIG_PANEL_PARPORT
333 #if DEFAULT_PROFILE == 0 /* custom */
334 #ifdef CONFIG_PANEL_KEYPAD
335 #undef DEFAULT_KEYPAD
336 #define DEFAULT_KEYPAD CONFIG_PANEL_KEYPAD
339 #ifdef CONFIG_PANEL_LCD
341 #define DEFAULT_LCD CONFIG_PANEL_LCD
344 #ifdef CONFIG_PANEL_LCD_WIDTH
345 #undef DEFAULT_LCD_WIDTH
346 #define DEFAULT_LCD_WIDTH CONFIG_PANEL_LCD_WIDTH
349 #ifdef CONFIG_PANEL_LCD_BWIDTH
350 #undef DEFAULT_LCD_BWIDTH
351 #define DEFAULT_LCD_BWIDTH CONFIG_PANEL_LCD_BWIDTH
354 #ifdef CONFIG_PANEL_LCD_HWIDTH
355 #undef DEFAULT_LCD_HWIDTH
356 #define DEFAULT_LCD_HWIDTH CONFIG_PANEL_LCD_HWIDTH
359 #ifdef CONFIG_PANEL_LCD_HEIGHT
360 #undef DEFAULT_LCD_HEIGHT
361 #define DEFAULT_LCD_HEIGHT CONFIG_PANEL_LCD_HEIGHT
364 #ifdef CONFIG_PANEL_LCD_PROTO
365 #undef DEFAULT_LCD_PROTO
366 #define DEFAULT_LCD_PROTO CONFIG_PANEL_LCD_PROTO
369 #ifdef CONFIG_PANEL_LCD_PIN_E
370 #undef DEFAULT_LCD_PIN_E
371 #define DEFAULT_LCD_PIN_E CONFIG_PANEL_LCD_PIN_E
374 #ifdef CONFIG_PANEL_LCD_PIN_RS
375 #undef DEFAULT_LCD_PIN_RS
376 #define DEFAULT_LCD_PIN_RS CONFIG_PANEL_LCD_PIN_RS
379 #ifdef CONFIG_PANEL_LCD_PIN_RW
380 #undef DEFAULT_LCD_PIN_RW
381 #define DEFAULT_LCD_PIN_RW CONFIG_PANEL_LCD_PIN_RW
384 #ifdef CONFIG_PANEL_LCD_PIN_SCL
385 #undef DEFAULT_LCD_PIN_SCL
386 #define DEFAULT_LCD_PIN_SCL CONFIG_PANEL_LCD_PIN_SCL
389 #ifdef CONFIG_PANEL_LCD_PIN_SDA
390 #undef DEFAULT_LCD_PIN_SDA
391 #define DEFAULT_LCD_PIN_SDA CONFIG_PANEL_LCD_PIN_SDA
394 #ifdef CONFIG_PANEL_LCD_PIN_BL
395 #undef DEFAULT_LCD_PIN_BL
396 #define DEFAULT_LCD_PIN_BL CONFIG_PANEL_LCD_PIN_BL
399 #ifdef CONFIG_PANEL_LCD_CHARSET
400 #undef DEFAULT_LCD_CHARSET
401 #define DEFAULT_LCD_CHARSET CONFIG_PANEL_LCD_CHARSET
404 #endif /* DEFAULT_PROFILE == 0 */
406 /* global variables */
407 static int keypad_open_cnt; /* #times opened */
408 static int lcd_open_cnt; /* #times opened */
409 static struct pardevice *pprt;
411 static int lcd_initialized;
412 static int keypad_initialized;
414 static int light_tempo;
416 static char lcd_must_clear;
417 static char lcd_left_shift;
418 static char init_in_progress;
420 static void (*lcd_write_cmd)(int);
421 static void (*lcd_write_data)(int);
422 static void (*lcd_clear_fast)(void);
424 static DEFINE_SPINLOCK(pprt_lock);
425 static struct timer_list scan_timer;
427 MODULE_DESCRIPTION("Generic parallel port LCD/Keypad driver");
429 static int parport = -1;
430 module_param(parport, int, 0000);
431 MODULE_PARM_DESC(parport, "Parallel port index (0=lpt1, 1=lpt2, ...)");
433 static int lcd_height = -1;
434 module_param(lcd_height, int, 0000);
435 MODULE_PARM_DESC(lcd_height, "Number of lines on the LCD");
437 static int lcd_width = -1;
438 module_param(lcd_width, int, 0000);
439 MODULE_PARM_DESC(lcd_width, "Number of columns on the LCD");
441 static int lcd_bwidth = -1; /* internal buffer width (usually 40) */
442 module_param(lcd_bwidth, int, 0000);
443 MODULE_PARM_DESC(lcd_bwidth, "Internal LCD line width (40)");
445 static int lcd_hwidth = -1; /* hardware buffer width (usually 64) */
446 module_param(lcd_hwidth, int, 0000);
447 MODULE_PARM_DESC(lcd_hwidth, "LCD line hardware address (64)");
449 static int lcd_enabled = -1;
450 module_param(lcd_enabled, int, 0000);
451 MODULE_PARM_DESC(lcd_enabled, "Deprecated option, use lcd_type instead");
453 static int keypad_enabled = -1;
454 module_param(keypad_enabled, int, 0000);
455 MODULE_PARM_DESC(keypad_enabled, "Deprecated option, use keypad_type instead");
457 static int lcd_type = -1;
458 module_param(lcd_type, int, 0000);
459 MODULE_PARM_DESC(lcd_type,
460 "LCD type: 0=none, 1=old //, 2=serial ks0074, 3=hantronix //, 4=nexcom //, 5=compiled-in");
462 static int lcd_proto = -1;
463 module_param(lcd_proto, int, 0000);
464 MODULE_PARM_DESC(lcd_proto,
465 "LCD communication: 0=parallel (//), 1=serial, 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, 3=nexcom 4 keys");
476 static int profile = DEFAULT_PROFILE;
477 module_param(profile, int, 0000);
478 MODULE_PARM_DESC(profile,
479 "1=16x2 old kp; 2=serial 16x2, new kp; 3=16x2 hantronix; "
480 "4=16x2 nexcom; default=40x2, old kp");
483 * These are the parallel port pins the LCD control signals are connected to.
484 * Set this to 0 if the signal is not used. Set it to its opposite value
485 * (negative) if the signal is negated. -MAXINT is used to indicate that the
486 * pin has not been explicitly specified.
488 * WARNING! no check will be performed about collisions with keypad !
491 static int lcd_e_pin = PIN_NOT_SET;
492 module_param(lcd_e_pin, int, 0000);
493 MODULE_PARM_DESC(lcd_e_pin,
494 "# of the // port pin connected to LCD 'E' signal, with polarity (-17..17)");
496 static int lcd_rs_pin = PIN_NOT_SET;
497 module_param(lcd_rs_pin, int, 0000);
498 MODULE_PARM_DESC(lcd_rs_pin,
499 "# of the // port pin connected to LCD 'RS' signal, with polarity (-17..17)");
501 static int lcd_rw_pin = PIN_NOT_SET;
502 module_param(lcd_rw_pin, int, 0000);
503 MODULE_PARM_DESC(lcd_rw_pin,
504 "# of the // port pin connected to LCD 'RW' signal, with polarity (-17..17)");
506 static int lcd_bl_pin = PIN_NOT_SET;
507 module_param(lcd_bl_pin, int, 0000);
508 MODULE_PARM_DESC(lcd_bl_pin,
509 "# of the // port pin connected to LCD backlight, with polarity (-17..17)");
511 static int lcd_da_pin = PIN_NOT_SET;
512 module_param(lcd_da_pin, int, 0000);
513 MODULE_PARM_DESC(lcd_da_pin,
514 "# of the // port pin connected to serial LCD 'SDA' signal, with polarity (-17..17)");
516 static int lcd_cl_pin = PIN_NOT_SET;
517 module_param(lcd_cl_pin, int, 0000);
518 MODULE_PARM_DESC(lcd_cl_pin,
519 "# of the // port pin connected to serial LCD 'SCL' signal, with polarity (-17..17)");
521 static const unsigned char *lcd_char_conv;
523 /* for some LCD drivers (ks0074) we need a charset conversion table. */
524 static const unsigned char lcd_char_conv_ks0074[256] = {
525 /* 0|8 1|9 2|A 3|B 4|C 5|D 6|E 7|F */
526 /* 0x00 */ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
527 /* 0x08 */ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
528 /* 0x10 */ 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
529 /* 0x18 */ 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
530 /* 0x20 */ 0x20, 0x21, 0x22, 0x23, 0xa2, 0x25, 0x26, 0x27,
531 /* 0x28 */ 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
532 /* 0x30 */ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
533 /* 0x38 */ 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
534 /* 0x40 */ 0xa0, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
535 /* 0x48 */ 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
536 /* 0x50 */ 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
537 /* 0x58 */ 0x58, 0x59, 0x5a, 0xfa, 0xfb, 0xfc, 0x1d, 0xc4,
538 /* 0x60 */ 0x96, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
539 /* 0x68 */ 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
540 /* 0x70 */ 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
541 /* 0x78 */ 0x78, 0x79, 0x7a, 0xfd, 0xfe, 0xff, 0xce, 0x20,
542 /* 0x80 */ 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
543 /* 0x88 */ 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
544 /* 0x90 */ 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
545 /* 0x98 */ 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
546 /* 0xA0 */ 0x20, 0x40, 0xb1, 0xa1, 0x24, 0xa3, 0xfe, 0x5f,
547 /* 0xA8 */ 0x22, 0xc8, 0x61, 0x14, 0x97, 0x2d, 0xad, 0x96,
548 /* 0xB0 */ 0x80, 0x8c, 0x82, 0x83, 0x27, 0x8f, 0x86, 0xdd,
549 /* 0xB8 */ 0x2c, 0x81, 0x6f, 0x15, 0x8b, 0x8a, 0x84, 0x60,
550 /* 0xC0 */ 0xe2, 0xe2, 0xe2, 0x5b, 0x5b, 0xae, 0xbc, 0xa9,
551 /* 0xC8 */ 0xc5, 0xbf, 0xc6, 0xf1, 0xe3, 0xe3, 0xe3, 0xe3,
552 /* 0xD0 */ 0x44, 0x5d, 0xa8, 0xe4, 0xec, 0xec, 0x5c, 0x78,
553 /* 0xD8 */ 0xab, 0xa6, 0xe5, 0x5e, 0x5e, 0xe6, 0xaa, 0xbe,
554 /* 0xE0 */ 0x7f, 0xe7, 0xaf, 0x7b, 0x7b, 0xaf, 0xbd, 0xc8,
555 /* 0xE8 */ 0xa4, 0xa5, 0xc7, 0xf6, 0xa7, 0xe8, 0x69, 0x69,
556 /* 0xF0 */ 0xed, 0x7d, 0xa8, 0xe4, 0xec, 0x5c, 0x5c, 0x25,
557 /* 0xF8 */ 0xac, 0xa6, 0xea, 0xef, 0x7e, 0xeb, 0xb2, 0x79,
560 static const char old_keypad_profile[][4][9] = {
561 {"S0", "Left\n", "Left\n", ""},
562 {"S1", "Down\n", "Down\n", ""},
563 {"S2", "Up\n", "Up\n", ""},
564 {"S3", "Right\n", "Right\n", ""},
565 {"S4", "Esc\n", "Esc\n", ""},
566 {"S5", "Ret\n", "Ret\n", ""},
570 /* signals, press, repeat, release */
571 static const char new_keypad_profile[][4][9] = {
572 {"S0", "Left\n", "Left\n", ""},
573 {"S1", "Down\n", "Down\n", ""},
574 {"S2", "Up\n", "Up\n", ""},
575 {"S3", "Right\n", "Right\n", ""},
576 {"S4s5", "", "Esc\n", "Esc\n"},
577 {"s4S5", "", "Ret\n", "Ret\n"},
578 {"S4S5", "Help\n", "", ""},
579 /* add new signals above this line */
583 /* signals, press, repeat, release */
584 static const char nexcom_keypad_profile[][4][9] = {
585 {"a-p-e-", "Down\n", "Down\n", ""},
586 {"a-p-E-", "Ret\n", "Ret\n", ""},
587 {"a-P-E-", "Esc\n", "Esc\n", ""},
588 {"a-P-e-", "Up\n", "Up\n", ""},
589 /* add new signals above this line */
593 static const char (*keypad_profile)[4][9] = old_keypad_profile;
595 /* FIXME: this should be converted to a bit array containing signals states */
597 unsigned char e; /* parallel LCD E (data latch on falling edge) */
598 unsigned char rs; /* parallel LCD RS (0 = cmd, 1 = data) */
599 unsigned char rw; /* parallel LCD R/W (0 = W, 1 = R) */
600 unsigned char bl; /* parallel LCD backlight (0 = off, 1 = on) */
601 unsigned char cl; /* serial LCD clock (latch on rising edge) */
602 unsigned char da; /* serial LCD data */
605 static void init_scan_timer(void);
607 /* sets data port bits according to current signals values */
608 static int set_data_bits(void)
613 for (bit = 0; bit < LCD_BITS; bit++)
614 val &= lcd_bits[LCD_PORT_D][bit][BIT_MSK];
616 val |= lcd_bits[LCD_PORT_D][LCD_BIT_E][bits.e]
617 | lcd_bits[LCD_PORT_D][LCD_BIT_RS][bits.rs]
618 | lcd_bits[LCD_PORT_D][LCD_BIT_RW][bits.rw]
619 | lcd_bits[LCD_PORT_D][LCD_BIT_BL][bits.bl]
620 | lcd_bits[LCD_PORT_D][LCD_BIT_CL][bits.cl]
621 | lcd_bits[LCD_PORT_D][LCD_BIT_DA][bits.da];
627 /* sets ctrl port bits according to current signals values */
628 static int set_ctrl_bits(void)
633 for (bit = 0; bit < LCD_BITS; bit++)
634 val &= lcd_bits[LCD_PORT_C][bit][BIT_MSK];
636 val |= lcd_bits[LCD_PORT_C][LCD_BIT_E][bits.e]
637 | lcd_bits[LCD_PORT_C][LCD_BIT_RS][bits.rs]
638 | lcd_bits[LCD_PORT_C][LCD_BIT_RW][bits.rw]
639 | lcd_bits[LCD_PORT_C][LCD_BIT_BL][bits.bl]
640 | lcd_bits[LCD_PORT_C][LCD_BIT_CL][bits.cl]
641 | lcd_bits[LCD_PORT_C][LCD_BIT_DA][bits.da];
647 /* sets ctrl & data port bits according to current signals values */
648 static void panel_set_bits(void)
655 * Converts a parallel port pin (from -25 to 25) to data and control ports
656 * masks, and data and control port bits. The signal will be considered
657 * unconnected if it's on pin 0 or an invalid pin (<-25 or >25).
659 * Result will be used this way :
660 * out(dport, in(dport) & d_val[2] | d_val[signal_state])
661 * out(cport, in(cport) & c_val[2] | c_val[signal_state])
663 static void pin_to_bits(int pin, unsigned char *d_val, unsigned char *c_val)
665 int d_bit, c_bit, inv;
667 d_val[0] = c_val[0] = d_val[1] = c_val[1] = 0;
668 d_val[2] = c_val[2] = 0xFF;
680 case PIN_STROBE: /* strobe, inverted */
684 case PIN_D0...PIN_D7: /* D0 - D7 = 2 - 9 */
685 d_bit = 1 << (pin - 2);
687 case PIN_AUTOLF: /* autofeed, inverted */
691 case PIN_INITP: /* init, direct */
694 case PIN_SELECP: /* select_in, inverted */
698 default: /* unknown pin, ignore */
711 /* sleeps that many milliseconds with a reschedule */
712 static void long_sleep(int ms)
718 current->state = TASK_INTERRUPTIBLE;
719 schedule_timeout((ms * HZ + 999) / 1000);
723 /* send a serial byte to the LCD panel. The caller is responsible for locking
725 static void lcd_send_serial(int byte)
729 /* the data bit is set on D0, and the clock on STROBE.
730 * LCD reads D0 on STROBE's rising edge. */
731 for (bit = 0; bit < 8; bit++) {
732 bits.cl = BIT_CLR; /* CLK low */
736 udelay(2); /* maintain the data during 2 us before CLK up */
737 bits.cl = BIT_SET; /* CLK high */
739 udelay(1); /* maintain the strobe during 1 us */
744 /* turn the backlight on or off */
745 static void lcd_backlight(int on)
747 if (lcd_bl_pin == PIN_NONE)
750 /* The backlight is activated by setting the AUTOFEED line to +5V */
751 spin_lock_irq(&pprt_lock);
754 spin_unlock_irq(&pprt_lock);
757 /* send a command to the LCD panel in serial mode */
758 static void lcd_write_cmd_s(int cmd)
760 spin_lock_irq(&pprt_lock);
761 lcd_send_serial(0x1F); /* R/W=W, RS=0 */
762 lcd_send_serial(cmd & 0x0F);
763 lcd_send_serial((cmd >> 4) & 0x0F);
764 udelay(40); /* the shortest command takes at least 40 us */
765 spin_unlock_irq(&pprt_lock);
768 /* send data to the LCD panel in serial mode */
769 static void lcd_write_data_s(int data)
771 spin_lock_irq(&pprt_lock);
772 lcd_send_serial(0x5F); /* R/W=W, RS=1 */
773 lcd_send_serial(data & 0x0F);
774 lcd_send_serial((data >> 4) & 0x0F);
775 udelay(40); /* the shortest data takes at least 40 us */
776 spin_unlock_irq(&pprt_lock);
779 /* send a command to the LCD panel in 8 bits parallel mode */
780 static void lcd_write_cmd_p8(int cmd)
782 spin_lock_irq(&pprt_lock);
783 /* present the data to the data port */
785 udelay(20); /* maintain the data during 20 us before the strobe */
792 udelay(40); /* maintain the strobe during 40 us */
797 udelay(120); /* the shortest command takes at least 120 us */
798 spin_unlock_irq(&pprt_lock);
801 /* send data to the LCD panel in 8 bits parallel mode */
802 static void lcd_write_data_p8(int data)
804 spin_lock_irq(&pprt_lock);
805 /* present the data to the data port */
807 udelay(20); /* maintain the data during 20 us before the strobe */
814 udelay(40); /* maintain the strobe during 40 us */
819 udelay(45); /* the shortest data takes at least 45 us */
820 spin_unlock_irq(&pprt_lock);
823 /* send a command to the TI LCD panel */
824 static void lcd_write_cmd_tilcd(int cmd)
826 spin_lock_irq(&pprt_lock);
827 /* present the data to the control port */
830 spin_unlock_irq(&pprt_lock);
833 /* send data to the TI LCD panel */
834 static void lcd_write_data_tilcd(int data)
836 spin_lock_irq(&pprt_lock);
837 /* present the data to the data port */
840 spin_unlock_irq(&pprt_lock);
843 static void lcd_gotoxy(void)
845 lcd_write_cmd(0x80 /* set DDRAM address */
846 | (lcd_addr_y ? lcd_hwidth : 0)
847 /* we force the cursor to stay at the end of the
848 line if it wants to go farther */
849 | ((lcd_addr_x < lcd_bwidth) ? lcd_addr_x &
850 (lcd_hwidth - 1) : lcd_bwidth - 1));
853 static void lcd_print(char c)
855 if (lcd_addr_x < lcd_bwidth) {
856 if (lcd_char_conv != NULL)
857 c = lcd_char_conv[(unsigned char)c];
861 /* prevents the cursor from wrapping onto the next line */
862 if (lcd_addr_x == lcd_bwidth)
866 /* fills the display with spaces and resets X/Y */
867 static void lcd_clear_fast_s(void)
870 lcd_addr_x = lcd_addr_y = 0;
873 spin_lock_irq(&pprt_lock);
874 for (pos = 0; pos < lcd_height * lcd_hwidth; pos++) {
875 lcd_send_serial(0x5F); /* R/W=W, RS=1 */
876 lcd_send_serial(' ' & 0x0F);
877 lcd_send_serial((' ' >> 4) & 0x0F);
878 udelay(40); /* the shortest data takes at least 40 us */
880 spin_unlock_irq(&pprt_lock);
882 lcd_addr_x = lcd_addr_y = 0;
886 /* fills the display with spaces and resets X/Y */
887 static void lcd_clear_fast_p8(void)
890 lcd_addr_x = lcd_addr_y = 0;
893 spin_lock_irq(&pprt_lock);
894 for (pos = 0; pos < lcd_height * lcd_hwidth; pos++) {
895 /* present the data to the data port */
898 /* maintain the data during 20 us before the strobe */
906 /* maintain the strobe during 40 us */
912 /* the shortest data takes at least 45 us */
915 spin_unlock_irq(&pprt_lock);
917 lcd_addr_x = lcd_addr_y = 0;
921 /* fills the display with spaces and resets X/Y */
922 static void lcd_clear_fast_tilcd(void)
925 lcd_addr_x = lcd_addr_y = 0;
928 spin_lock_irq(&pprt_lock);
929 for (pos = 0; pos < lcd_height * lcd_hwidth; pos++) {
930 /* present the data to the data port */
935 spin_unlock_irq(&pprt_lock);
937 lcd_addr_x = lcd_addr_y = 0;
941 /* clears the display and resets X/Y */
942 static void lcd_clear_display(void)
944 lcd_write_cmd(0x01); /* clear display */
945 lcd_addr_x = lcd_addr_y = 0;
946 /* we must wait a few milliseconds (15) */
950 static void lcd_init_display(void)
953 lcd_flags = ((lcd_height > 1) ? LCD_FLAG_N : 0)
954 | LCD_FLAG_D | LCD_FLAG_C | LCD_FLAG_B;
956 long_sleep(20); /* wait 20 ms after power-up for the paranoid */
958 lcd_write_cmd(0x30); /* 8bits, 1 line, small fonts */
960 lcd_write_cmd(0x30); /* 8bits, 1 line, small fonts */
962 lcd_write_cmd(0x30); /* 8bits, 1 line, small fonts */
965 lcd_write_cmd(0x30 /* set font height and lines number */
966 | ((lcd_flags & LCD_FLAG_F) ? 4 : 0)
967 | ((lcd_flags & LCD_FLAG_N) ? 8 : 0)
971 lcd_write_cmd(0x08); /* display off, cursor off, blink off */
974 lcd_write_cmd(0x08 /* set display mode */
975 | ((lcd_flags & LCD_FLAG_D) ? 4 : 0)
976 | ((lcd_flags & LCD_FLAG_C) ? 2 : 0)
977 | ((lcd_flags & LCD_FLAG_B) ? 1 : 0)
980 lcd_backlight((lcd_flags & LCD_FLAG_L) ? 1 : 0);
984 /* entry mode set : increment, cursor shifting */
991 * These are the file operation function for user access to /dev/lcd
992 * This function can also be called from inside the kernel, by
993 * setting file and ppos to NULL.
997 static inline int handle_lcd_special_code(void)
999 /* LCD special codes */
1003 char *esc = lcd_escape + 2;
1004 int oldflags = lcd_flags;
1006 /* check for display mode flags */
1008 case 'D': /* Display ON */
1009 lcd_flags |= LCD_FLAG_D;
1012 case 'd': /* Display OFF */
1013 lcd_flags &= ~LCD_FLAG_D;
1016 case 'C': /* Cursor ON */
1017 lcd_flags |= LCD_FLAG_C;
1020 case 'c': /* Cursor OFF */
1021 lcd_flags &= ~LCD_FLAG_C;
1024 case 'B': /* Blink ON */
1025 lcd_flags |= LCD_FLAG_B;
1028 case 'b': /* Blink OFF */
1029 lcd_flags &= ~LCD_FLAG_B;
1032 case '+': /* Back light ON */
1033 lcd_flags |= LCD_FLAG_L;
1036 case '-': /* Back light OFF */
1037 lcd_flags &= ~LCD_FLAG_L;
1041 /* flash back light using the keypad timer */
1042 if (scan_timer.function != NULL) {
1043 if (light_tempo == 0 && ((lcd_flags & LCD_FLAG_L) == 0))
1045 light_tempo = FLASH_LIGHT_TEMPO;
1049 case 'f': /* Small Font */
1050 lcd_flags &= ~LCD_FLAG_F;
1053 case 'F': /* Large Font */
1054 lcd_flags |= LCD_FLAG_F;
1057 case 'n': /* One Line */
1058 lcd_flags &= ~LCD_FLAG_N;
1061 case 'N': /* Two Lines */
1062 lcd_flags |= LCD_FLAG_N;
1064 case 'l': /* Shift Cursor Left */
1065 if (lcd_addr_x > 0) {
1066 /* back one char if not at end of line */
1067 if (lcd_addr_x < lcd_bwidth)
1068 lcd_write_cmd(0x10);
1073 case 'r': /* shift cursor right */
1074 if (lcd_addr_x < lcd_width) {
1075 /* allow the cursor to pass the end of the line */
1078 lcd_write_cmd(0x14);
1083 case 'L': /* shift display left */
1085 lcd_write_cmd(0x18);
1088 case 'R': /* shift display right */
1090 lcd_write_cmd(0x1C);
1093 case 'k': { /* kill end of line */
1095 for (x = lcd_addr_x; x < lcd_bwidth; x++)
1096 lcd_write_data(' ');
1098 /* restore cursor position */
1103 case 'I': /* reinitialize display */
1109 /* Generator : LGcxxxxx...xx; must have <c> between '0'
1110 * and '7', representing the numerical ASCII code of the
1111 * redefined character, and <xx...xx> a sequence of 16
1112 * hex digits representing 8 bytes for each character.
1113 * Most LCDs will only use 5 lower bits of the 7 first
1117 unsigned char cgbytes[8];
1118 unsigned char cgaddr;
1124 if (strchr(esc, ';') == NULL)
1129 cgaddr = *(esc++) - '0';
1138 while (*esc && cgoffset < 8) {
1140 if (*esc >= '0' && *esc <= '9')
1141 value |= (*esc - '0') << shift;
1142 else if (*esc >= 'A' && *esc <= 'Z')
1143 value |= (*esc - 'A' + 10) << shift;
1144 else if (*esc >= 'a' && *esc <= 'z')
1145 value |= (*esc - 'a' + 10) << shift;
1152 cgbytes[cgoffset++] = value;
1159 lcd_write_cmd(0x40 | (cgaddr * 8));
1160 for (addr = 0; addr < cgoffset; addr++)
1161 lcd_write_data(cgbytes[addr]);
1163 /* ensures that we stop writing to CGRAM */
1168 case 'x': /* gotoxy : LxXXX[yYYY]; */
1169 case 'y': /* gotoxy : LyYYY[xXXX]; */
1170 if (strchr(esc, ';') == NULL)
1176 if (kstrtoul(esc, 10, &lcd_addr_x) < 0)
1178 } else if (*esc == 'y') {
1180 if (kstrtoul(esc, 10, &lcd_addr_y) < 0)
1191 /* Check whether one flag was changed */
1192 if (oldflags != lcd_flags) {
1193 /* check whether one of B,C,D flags were changed */
1194 if ((oldflags ^ lcd_flags) &
1195 (LCD_FLAG_B | LCD_FLAG_C | LCD_FLAG_D))
1196 /* set display mode */
1198 | ((lcd_flags & LCD_FLAG_D) ? 4 : 0)
1199 | ((lcd_flags & LCD_FLAG_C) ? 2 : 0)
1200 | ((lcd_flags & LCD_FLAG_B) ? 1 : 0));
1201 /* check whether one of F,N flags was changed */
1202 else if ((oldflags ^ lcd_flags) & (LCD_FLAG_F | LCD_FLAG_N))
1204 | ((lcd_flags & LCD_FLAG_F) ? 4 : 0)
1205 | ((lcd_flags & LCD_FLAG_N) ? 8 : 0));
1206 /* check whether L flag was changed */
1207 else if ((oldflags ^ lcd_flags) & (LCD_FLAG_L)) {
1208 if (lcd_flags & (LCD_FLAG_L))
1210 else if (light_tempo == 0)
1211 /* switch off the light only when the tempo
1220 static ssize_t lcd_write(struct file *file,
1221 const char *buf, size_t count, loff_t *ppos)
1223 const char *tmp = buf;
1226 for (; count-- > 0; (ppos ? (*ppos)++ : 0), ++tmp) {
1227 if (!in_interrupt() && (((count + 1) & 0x1f) == 0))
1228 /* let's be a little nice with other processes
1229 that need some CPU */
1232 if (ppos == NULL && file == NULL)
1233 /* let's not use get_user() from the kernel ! */
1235 else if (get_user(c, tmp))
1238 /* first, we'll test if we're in escape mode */
1239 if ((c != '\n') && lcd_escape_len >= 0) {
1240 /* yes, let's add this char to the buffer */
1241 lcd_escape[lcd_escape_len++] = c;
1242 lcd_escape[lcd_escape_len] = 0;
1244 /* aborts any previous escape sequence */
1245 lcd_escape_len = -1;
1248 case LCD_ESCAPE_CHAR:
1249 /* start of an escape sequence */
1251 lcd_escape[lcd_escape_len] = 0;
1254 /* go back one char and clear it */
1255 if (lcd_addr_x > 0) {
1256 /* check if we're not at the
1258 if (lcd_addr_x < lcd_bwidth)
1260 lcd_write_cmd(0x10);
1263 /* replace with a space */
1264 lcd_write_data(' ');
1265 /* back one char again */
1266 lcd_write_cmd(0x10);
1269 /* quickly clear the display */
1273 /* flush the remainder of the current line and
1274 go to the beginning of the next line */
1275 for (; lcd_addr_x < lcd_bwidth; lcd_addr_x++)
1276 lcd_write_data(' ');
1278 lcd_addr_y = (lcd_addr_y + 1) % lcd_height;
1282 /* go to the beginning of the same line */
1287 /* print a space instead of the tab */
1291 /* simply print this char */
1297 /* now we'll see if we're in an escape mode and if the current
1298 escape sequence can be understood. */
1299 if (lcd_escape_len >= 2) {
1302 if (!strcmp(lcd_escape, "[2J")) {
1303 /* clear the display */
1306 } else if (!strcmp(lcd_escape, "[H")) {
1307 /* cursor to home */
1308 lcd_addr_x = lcd_addr_y = 0;
1312 /* codes starting with ^[[L */
1313 else if ((lcd_escape_len >= 3) &&
1314 (lcd_escape[0] == '[') &&
1315 (lcd_escape[1] == 'L')) {
1316 processed = handle_lcd_special_code();
1319 /* LCD special escape codes */
1320 /* flush the escape sequence if it's been processed
1321 or if it is getting too long. */
1322 if (processed || (lcd_escape_len >= LCD_ESCAPE_LEN))
1323 lcd_escape_len = -1;
1324 } /* escape codes */
1330 static int lcd_open(struct inode *inode, struct file *file)
1333 return -EBUSY; /* open only once at a time */
1335 if (file->f_mode & FMODE_READ) /* device is write-only */
1338 if (lcd_must_clear) {
1339 lcd_clear_display();
1343 return nonseekable_open(inode, file);
1346 static int lcd_release(struct inode *inode, struct file *file)
1352 static const struct file_operations lcd_fops = {
1355 .release = lcd_release,
1356 .llseek = no_llseek,
1359 static struct miscdevice lcd_dev = {
1365 /* public function usable from the kernel for any purpose */
1366 static void panel_lcd_print(const char *s)
1368 if (lcd_enabled && lcd_initialized)
1369 lcd_write(NULL, s, strlen(s), NULL);
1372 /* initialize the LCD driver */
1373 static void lcd_init(void)
1377 /* parallel mode, 8 bits */
1379 lcd_proto = LCD_PROTO_PARALLEL;
1380 if (lcd_charset < 0)
1381 lcd_charset = LCD_CHARSET_NORMAL;
1382 if (lcd_e_pin == PIN_NOT_SET)
1383 lcd_e_pin = PIN_STROBE;
1384 if (lcd_rs_pin == PIN_NOT_SET)
1385 lcd_rs_pin = PIN_AUTOLF;
1396 case LCD_TYPE_KS0074:
1397 /* serial mode, ks0074 */
1399 lcd_proto = LCD_PROTO_SERIAL;
1400 if (lcd_charset < 0)
1401 lcd_charset = LCD_CHARSET_KS0074;
1402 if (lcd_bl_pin == PIN_NOT_SET)
1403 lcd_bl_pin = PIN_AUTOLF;
1404 if (lcd_cl_pin == PIN_NOT_SET)
1405 lcd_cl_pin = PIN_STROBE;
1406 if (lcd_da_pin == PIN_NOT_SET)
1407 lcd_da_pin = PIN_D0;
1418 case LCD_TYPE_NEXCOM:
1419 /* parallel mode, 8 bits, generic */
1421 lcd_proto = LCD_PROTO_PARALLEL;
1422 if (lcd_charset < 0)
1423 lcd_charset = LCD_CHARSET_NORMAL;
1424 if (lcd_e_pin == PIN_NOT_SET)
1425 lcd_e_pin = PIN_AUTOLF;
1426 if (lcd_rs_pin == PIN_NOT_SET)
1427 lcd_rs_pin = PIN_SELECP;
1428 if (lcd_rw_pin == PIN_NOT_SET)
1429 lcd_rw_pin = PIN_INITP;
1440 case LCD_TYPE_CUSTOM:
1441 /* customer-defined */
1443 lcd_proto = DEFAULT_LCD_PROTO;
1444 if (lcd_charset < 0)
1445 lcd_charset = DEFAULT_LCD_CHARSET;
1446 /* default geometry will be set later */
1448 case LCD_TYPE_HANTRONIX:
1449 /* parallel mode, 8 bits, hantronix-like */
1452 lcd_proto = LCD_PROTO_PARALLEL;
1453 if (lcd_charset < 0)
1454 lcd_charset = LCD_CHARSET_NORMAL;
1455 if (lcd_e_pin == PIN_NOT_SET)
1456 lcd_e_pin = PIN_STROBE;
1457 if (lcd_rs_pin == PIN_NOT_SET)
1458 lcd_rs_pin = PIN_SELECP;
1471 /* this is used to catch wrong and default values */
1473 lcd_width = DEFAULT_LCD_WIDTH;
1474 if (lcd_bwidth <= 0)
1475 lcd_bwidth = DEFAULT_LCD_BWIDTH;
1476 if (lcd_hwidth <= 0)
1477 lcd_hwidth = DEFAULT_LCD_HWIDTH;
1478 if (lcd_height <= 0)
1479 lcd_height = DEFAULT_LCD_HEIGHT;
1481 if (lcd_proto == LCD_PROTO_SERIAL) { /* SERIAL */
1482 lcd_write_cmd = lcd_write_cmd_s;
1483 lcd_write_data = lcd_write_data_s;
1484 lcd_clear_fast = lcd_clear_fast_s;
1486 if (lcd_cl_pin == PIN_NOT_SET)
1487 lcd_cl_pin = DEFAULT_LCD_PIN_SCL;
1488 if (lcd_da_pin == PIN_NOT_SET)
1489 lcd_da_pin = DEFAULT_LCD_PIN_SDA;
1491 } else if (lcd_proto == LCD_PROTO_PARALLEL) { /* PARALLEL */
1492 lcd_write_cmd = lcd_write_cmd_p8;
1493 lcd_write_data = lcd_write_data_p8;
1494 lcd_clear_fast = lcd_clear_fast_p8;
1496 if (lcd_e_pin == PIN_NOT_SET)
1497 lcd_e_pin = DEFAULT_LCD_PIN_E;
1498 if (lcd_rs_pin == PIN_NOT_SET)
1499 lcd_rs_pin = DEFAULT_LCD_PIN_RS;
1500 if (lcd_rw_pin == PIN_NOT_SET)
1501 lcd_rw_pin = DEFAULT_LCD_PIN_RW;
1503 lcd_write_cmd = lcd_write_cmd_tilcd;
1504 lcd_write_data = lcd_write_data_tilcd;
1505 lcd_clear_fast = lcd_clear_fast_tilcd;
1508 if (lcd_bl_pin == PIN_NOT_SET)
1509 lcd_bl_pin = DEFAULT_LCD_PIN_BL;
1511 if (lcd_e_pin == PIN_NOT_SET)
1512 lcd_e_pin = PIN_NONE;
1513 if (lcd_rs_pin == PIN_NOT_SET)
1514 lcd_rs_pin = PIN_NONE;
1515 if (lcd_rw_pin == PIN_NOT_SET)
1516 lcd_rw_pin = PIN_NONE;
1517 if (lcd_bl_pin == PIN_NOT_SET)
1518 lcd_bl_pin = PIN_NONE;
1519 if (lcd_cl_pin == PIN_NOT_SET)
1520 lcd_cl_pin = PIN_NONE;
1521 if (lcd_da_pin == PIN_NOT_SET)
1522 lcd_da_pin = PIN_NONE;
1524 if (lcd_charset < 0)
1525 lcd_charset = DEFAULT_LCD_CHARSET;
1527 if (lcd_charset == LCD_CHARSET_KS0074)
1528 lcd_char_conv = lcd_char_conv_ks0074;
1530 lcd_char_conv = NULL;
1532 if (lcd_bl_pin != PIN_NONE)
1535 pin_to_bits(lcd_e_pin, lcd_bits[LCD_PORT_D][LCD_BIT_E],
1536 lcd_bits[LCD_PORT_C][LCD_BIT_E]);
1537 pin_to_bits(lcd_rs_pin, lcd_bits[LCD_PORT_D][LCD_BIT_RS],
1538 lcd_bits[LCD_PORT_C][LCD_BIT_RS]);
1539 pin_to_bits(lcd_rw_pin, lcd_bits[LCD_PORT_D][LCD_BIT_RW],
1540 lcd_bits[LCD_PORT_C][LCD_BIT_RW]);
1541 pin_to_bits(lcd_bl_pin, lcd_bits[LCD_PORT_D][LCD_BIT_BL],
1542 lcd_bits[LCD_PORT_C][LCD_BIT_BL]);
1543 pin_to_bits(lcd_cl_pin, lcd_bits[LCD_PORT_D][LCD_BIT_CL],
1544 lcd_bits[LCD_PORT_C][LCD_BIT_CL]);
1545 pin_to_bits(lcd_da_pin, lcd_bits[LCD_PORT_D][LCD_BIT_DA],
1546 lcd_bits[LCD_PORT_C][LCD_BIT_DA]);
1548 /* before this line, we must NOT send anything to the display.
1549 * Since lcd_init_display() needs to write data, we have to
1550 * enable mark the LCD initialized just before. */
1551 lcd_initialized = 1;
1554 /* display a short message */
1555 #ifdef CONFIG_PANEL_CHANGE_MESSAGE
1556 #ifdef CONFIG_PANEL_BOOT_MESSAGE
1557 panel_lcd_print("\x1b[Lc\x1b[Lb\x1b[L*" CONFIG_PANEL_BOOT_MESSAGE);
1560 panel_lcd_print("\x1b[Lc\x1b[Lb\x1b[L*Linux-" UTS_RELEASE "\nPanel-"
1563 lcd_addr_x = lcd_addr_y = 0;
1564 /* clear the display on the next device opening */
1570 * These are the file operation function for user access to /dev/keypad
1573 static ssize_t keypad_read(struct file *file,
1574 char *buf, size_t count, loff_t *ppos)
1580 if (keypad_buflen == 0) {
1581 if (file->f_flags & O_NONBLOCK)
1584 if (wait_event_interruptible(keypad_read_wait,
1585 keypad_buflen != 0))
1589 for (; count-- > 0 && (keypad_buflen > 0);
1590 ++i, ++tmp, --keypad_buflen) {
1591 put_user(keypad_buffer[keypad_start], tmp);
1592 keypad_start = (keypad_start + 1) % KEYPAD_BUFFER;
1599 static int keypad_open(struct inode *inode, struct file *file)
1602 if (keypad_open_cnt)
1603 return -EBUSY; /* open only once at a time */
1605 if (file->f_mode & FMODE_WRITE) /* device is read-only */
1608 keypad_buflen = 0; /* flush the buffer on opening */
1613 static int keypad_release(struct inode *inode, struct file *file)
1619 static const struct file_operations keypad_fops = {
1620 .read = keypad_read, /* read */
1621 .open = keypad_open, /* open */
1622 .release = keypad_release, /* close */
1623 .llseek = default_llseek,
1626 static struct miscdevice keypad_dev = {
1632 static void keypad_send_key(const char *string, int max_len)
1634 if (init_in_progress)
1637 /* send the key to the device only if a process is attached to it. */
1638 if (keypad_open_cnt > 0) {
1639 while (max_len-- && keypad_buflen < KEYPAD_BUFFER && *string) {
1640 keypad_buffer[(keypad_start + keypad_buflen++) %
1641 KEYPAD_BUFFER] = *string++;
1643 wake_up_interruptible(&keypad_read_wait);
1647 /* this function scans all the bits involving at least one logical signal,
1648 * and puts the results in the bitfield "phys_read" (one bit per established
1649 * contact), and sets "phys_read_prev" to "phys_read".
1651 * Note: to debounce input signals, we will only consider as switched a signal
1652 * which is stable across 2 measures. Signals which are different between two
1653 * reads will be kept as they previously were in their logical form (phys_prev).
1654 * A signal which has just switched will have a 1 in
1655 * (phys_read ^ phys_read_prev).
1657 static void phys_scan_contacts(void)
1664 phys_prev = phys_curr;
1665 phys_read_prev = phys_read;
1666 phys_read = 0; /* flush all signals */
1668 /* keep track of old value, with all outputs disabled */
1669 oldval = r_dtr(pprt) | scan_mask_o;
1670 /* activate all keyboard outputs (active low) */
1671 w_dtr(pprt, oldval & ~scan_mask_o);
1673 /* will have a 1 for each bit set to gnd */
1674 bitmask = PNL_PINPUT(r_str(pprt)) & scan_mask_i;
1675 /* disable all matrix signals */
1676 w_dtr(pprt, oldval);
1678 /* now that all outputs are cleared, the only active input bits are
1679 * directly connected to the ground
1682 /* 1 for each grounded input */
1683 gndmask = PNL_PINPUT(r_str(pprt)) & scan_mask_i;
1685 /* grounded inputs are signals 40-44 */
1686 phys_read |= (pmask_t) gndmask << 40;
1688 if (bitmask != gndmask) {
1689 /* since clearing the outputs changed some inputs, we know
1690 * that some input signals are currently tied to some outputs.
1691 * So we'll scan them.
1693 for (bit = 0; bit < 8; bit++) {
1696 if (!(scan_mask_o & bitval)) /* skip unused bits */
1699 w_dtr(pprt, oldval & ~bitval); /* enable this output */
1700 bitmask = PNL_PINPUT(r_str(pprt)) & ~gndmask;
1701 phys_read |= (pmask_t) bitmask << (5 * bit);
1703 w_dtr(pprt, oldval); /* disable all outputs */
1705 /* this is easy: use old bits when they are flapping,
1706 * use new ones when stable */
1707 phys_curr = (phys_prev & (phys_read ^ phys_read_prev)) |
1708 (phys_read & ~(phys_read ^ phys_read_prev));
1711 static inline int input_state_high(struct logical_input *input)
1715 * this is an invalid test. It tries to catch
1716 * transitions from single-key to multiple-key, but
1717 * doesn't take into account the contacts polarity.
1718 * The only solution to the problem is to parse keys
1719 * from the most complex to the simplest combinations,
1720 * and mark them as 'caught' once a combination
1721 * matches, then unmatch it for all other ones.
1724 /* try to catch dangerous transitions cases :
1725 * someone adds a bit, so this signal was a false
1726 * positive resulting from a transition. We should
1727 * invalidate the signal immediately and not call the
1729 * eg: 0 -(press A)-> A -(press B)-> AB : don't match A's release.
1731 if (((phys_prev & input->mask) == input->value)
1732 && ((phys_curr & input->mask) > input->value)) {
1733 input->state = INPUT_ST_LOW; /* invalidate */
1738 if ((phys_curr & input->mask) == input->value) {
1739 if ((input->type == INPUT_TYPE_STD) &&
1740 (input->high_timer == 0)) {
1741 input->high_timer++;
1742 if (input->u.std.press_fct != NULL)
1743 input->u.std.press_fct(input->u.std.press_data);
1744 } else if (input->type == INPUT_TYPE_KBD) {
1745 /* will turn on the light */
1748 if (input->high_timer == 0) {
1749 char *press_str = input->u.kbd.press_str;
1751 int s = sizeof(input->u.kbd.press_str);
1752 keypad_send_key(press_str, s);
1756 if (input->u.kbd.repeat_str[0]) {
1757 char *repeat_str = input->u.kbd.repeat_str;
1758 if (input->high_timer >= KEYPAD_REP_START) {
1759 int s = sizeof(input->u.kbd.repeat_str);
1760 input->high_timer -= KEYPAD_REP_DELAY;
1761 keypad_send_key(repeat_str, s);
1763 /* we will need to come back here soon */
1767 if (input->high_timer < 255)
1768 input->high_timer++;
1772 /* else signal falling down. Let's fall through. */
1773 input->state = INPUT_ST_FALLING;
1774 input->fall_timer = 0;
1779 static inline void input_state_falling(struct logical_input *input)
1782 /* FIXME !!! same comment as in input_state_high */
1783 if (((phys_prev & input->mask) == input->value)
1784 && ((phys_curr & input->mask) > input->value)) {
1785 input->state = INPUT_ST_LOW; /* invalidate */
1790 if ((phys_curr & input->mask) == input->value) {
1791 if (input->type == INPUT_TYPE_KBD) {
1792 /* will turn on the light */
1795 if (input->u.kbd.repeat_str[0]) {
1796 char *repeat_str = input->u.kbd.repeat_str;
1797 if (input->high_timer >= KEYPAD_REP_START) {
1798 int s = sizeof(input->u.kbd.repeat_str);
1799 input->high_timer -= KEYPAD_REP_DELAY;
1800 keypad_send_key(repeat_str, s);
1802 /* we will need to come back here soon */
1806 if (input->high_timer < 255)
1807 input->high_timer++;
1809 input->state = INPUT_ST_HIGH;
1810 } else if (input->fall_timer >= input->fall_time) {
1811 /* call release event */
1812 if (input->type == INPUT_TYPE_STD) {
1813 void (*release_fct)(int) = input->u.std.release_fct;
1814 if (release_fct != NULL)
1815 release_fct(input->u.std.release_data);
1816 } else if (input->type == INPUT_TYPE_KBD) {
1817 char *release_str = input->u.kbd.release_str;
1818 if (release_str[0]) {
1819 int s = sizeof(input->u.kbd.release_str);
1820 keypad_send_key(release_str, s);
1824 input->state = INPUT_ST_LOW;
1826 input->fall_timer++;
1831 static void panel_process_inputs(void)
1833 struct list_head *item;
1834 struct logical_input *input;
1838 list_for_each(item, &logical_inputs) {
1839 input = list_entry(item, struct logical_input, list);
1841 switch (input->state) {
1843 if ((phys_curr & input->mask) != input->value)
1845 /* if all needed ones were already set previously,
1846 * this means that this logical signal has been
1847 * activated by the releasing of another combined
1848 * signal, so we don't want to match.
1849 * eg: AB -(release B)-> A -(release A)-> 0 :
1852 if ((phys_prev & input->mask) == input->value)
1854 input->rise_timer = 0;
1855 input->state = INPUT_ST_RISING;
1856 /* no break here, fall through */
1857 case INPUT_ST_RISING:
1858 if ((phys_curr & input->mask) != input->value) {
1859 input->state = INPUT_ST_LOW;
1862 if (input->rise_timer < input->rise_time) {
1864 input->rise_timer++;
1867 input->high_timer = 0;
1868 input->state = INPUT_ST_HIGH;
1869 /* no break here, fall through */
1871 if (input_state_high(input))
1873 /* no break here, fall through */
1874 case INPUT_ST_FALLING:
1875 input_state_falling(input);
1880 static void panel_scan_timer(void)
1882 if (keypad_enabled && keypad_initialized) {
1883 if (spin_trylock_irq(&pprt_lock)) {
1884 phys_scan_contacts();
1886 /* no need for the parport anymore */
1887 spin_unlock_irq(&pprt_lock);
1890 if (!inputs_stable || phys_curr != phys_prev)
1891 panel_process_inputs();
1894 if (lcd_enabled && lcd_initialized) {
1896 if (light_tempo == 0 && ((lcd_flags & LCD_FLAG_L) == 0))
1898 light_tempo = FLASH_LIGHT_TEMPO;
1899 } else if (light_tempo > 0) {
1901 if (light_tempo == 0 && ((lcd_flags & LCD_FLAG_L) == 0))
1906 mod_timer(&scan_timer, jiffies + INPUT_POLL_TIME);
1909 static void init_scan_timer(void)
1911 if (scan_timer.function != NULL)
1912 return; /* already started */
1914 init_timer(&scan_timer);
1915 scan_timer.expires = jiffies + INPUT_POLL_TIME;
1916 scan_timer.data = 0;
1917 scan_timer.function = (void *)&panel_scan_timer;
1918 add_timer(&scan_timer);
1921 /* converts a name of the form "({BbAaPpSsEe}{01234567-})*" to a series of bits.
1922 * if <omask> or <imask> are non-null, they will be or'ed with the bits
1923 * corresponding to out and in bits respectively.
1924 * returns 1 if ok, 0 if error (in which case, nothing is written).
1926 static int input_name2mask(const char *name, pmask_t *mask, pmask_t *value,
1927 char *imask, char *omask)
1929 static char sigtab[10] = "EeSsPpAaBb";
1933 om = im = m = v = 0ULL;
1935 int in, out, bit, neg;
1936 for (in = 0; (in < sizeof(sigtab)) &&
1937 (sigtab[in] != *name); in++)
1939 if (in >= sizeof(sigtab))
1940 return 0; /* input name not found */
1941 neg = (in & 1); /* odd (lower) names are negated */
1946 if (isdigit(*name)) {
1949 } else if (*name == '-')
1952 return 0; /* unknown bit name */
1954 bit = (out * 5) + in;
1970 /* tries to bind a key to the signal name <name>. The key will send the
1971 * strings <press>, <repeat>, <release> for these respective events.
1972 * Returns the pointer to the new key if ok, NULL if the key could not be bound.
1974 static struct logical_input *panel_bind_key(const char *name, const char *press,
1976 const char *release)
1978 struct logical_input *key;
1980 key = kzalloc(sizeof(struct logical_input), GFP_KERNEL);
1984 if (!input_name2mask(name, &key->mask, &key->value, &scan_mask_i,
1990 key->type = INPUT_TYPE_KBD;
1991 key->state = INPUT_ST_LOW;
1995 strncpy(key->u.kbd.press_str, press, sizeof(key->u.kbd.press_str));
1996 strncpy(key->u.kbd.repeat_str, repeat, sizeof(key->u.kbd.repeat_str));
1997 strncpy(key->u.kbd.release_str, release,
1998 sizeof(key->u.kbd.release_str));
1999 list_add(&key->list, &logical_inputs);
2004 /* tries to bind a callback function to the signal name <name>. The function
2005 * <press_fct> will be called with the <press_data> arg when the signal is
2006 * activated, and so on for <release_fct>/<release_data>
2007 * Returns the pointer to the new signal if ok, NULL if the signal could not
2010 static struct logical_input *panel_bind_callback(char *name,
2011 void (*press_fct)(int),
2013 void (*release_fct)(int),
2016 struct logical_input *callback;
2018 callback = kmalloc(sizeof(struct logical_input), GFP_KERNEL);
2022 memset(callback, 0, sizeof(struct logical_input));
2023 if (!input_name2mask(name, &callback->mask, &callback->value,
2024 &scan_mask_i, &scan_mask_o))
2027 callback->type = INPUT_TYPE_STD;
2028 callback->state = INPUT_ST_LOW;
2029 callback->rise_time = 1;
2030 callback->fall_time = 1;
2031 callback->u.std.press_fct = press_fct;
2032 callback->u.std.press_data = press_data;
2033 callback->u.std.release_fct = release_fct;
2034 callback->u.std.release_data = release_data;
2035 list_add(&callback->list, &logical_inputs);
2040 static void keypad_init(void)
2043 init_waitqueue_head(&keypad_read_wait);
2044 keypad_buflen = 0; /* flushes any eventual noisy keystroke */
2046 /* Let's create all known keys */
2048 for (keynum = 0; keypad_profile[keynum][0][0]; keynum++) {
2049 panel_bind_key(keypad_profile[keynum][0],
2050 keypad_profile[keynum][1],
2051 keypad_profile[keynum][2],
2052 keypad_profile[keynum][3]);
2056 keypad_initialized = 1;
2059 /**************************************************/
2060 /* device initialization */
2061 /**************************************************/
2063 static int panel_notify_sys(struct notifier_block *this, unsigned long code,
2066 if (lcd_enabled && lcd_initialized) {
2070 ("\x0cReloading\nSystem...\x1b[Lc\x1b[Lb\x1b[L+");
2074 ("\x0cSystem Halted.\x1b[Lc\x1b[Lb\x1b[L+");
2077 panel_lcd_print("\x0cPower off.\x1b[Lc\x1b[Lb\x1b[L+");
2086 static struct notifier_block panel_notifier = {
2092 static void panel_attach(struct parport *port)
2094 if (port->number != parport)
2098 pr_err("%s: port->number=%d parport=%d, already registered!\n",
2099 __func__, port->number, parport);
2103 pprt = parport_register_device(port, "panel", NULL, NULL, /* pf, kf */
2105 /*PARPORT_DEV_EXCL */
2108 pr_err("%s: port->number=%d parport=%d, parport_register_device() failed\n",
2109 __func__, port->number, parport);
2113 if (parport_claim(pprt)) {
2114 pr_err("could not claim access to parport%d. Aborting.\n",
2116 goto err_unreg_device;
2119 /* must init LCD first, just in case an IRQ from the keypad is
2120 * generated at keypad init
2124 if (misc_register(&lcd_dev))
2125 goto err_unreg_device;
2128 if (keypad_enabled) {
2130 if (misc_register(&keypad_dev))
2137 misc_deregister(&lcd_dev);
2139 parport_unregister_device(pprt);
2143 static void panel_detach(struct parport *port)
2145 if (port->number != parport)
2149 pr_err("%s: port->number=%d parport=%d, nothing to unregister.\n",
2150 __func__, port->number, parport);
2154 if (keypad_enabled && keypad_initialized) {
2155 misc_deregister(&keypad_dev);
2156 keypad_initialized = 0;
2159 if (lcd_enabled && lcd_initialized) {
2160 misc_deregister(&lcd_dev);
2161 lcd_initialized = 0;
2164 parport_release(pprt);
2165 parport_unregister_device(pprt);
2169 static struct parport_driver panel_driver = {
2171 .attach = panel_attach,
2172 .detach = panel_detach,
2176 static int panel_init(void)
2178 /* for backwards compatibility */
2179 if (keypad_type < 0)
2180 keypad_type = keypad_enabled;
2183 lcd_type = lcd_enabled;
2186 parport = DEFAULT_PARPORT;
2188 /* take care of an eventual profile */
2190 case PANEL_PROFILE_CUSTOM:
2191 /* custom profile */
2192 if (keypad_type < 0)
2193 keypad_type = DEFAULT_KEYPAD;
2195 lcd_type = DEFAULT_LCD;
2197 case PANEL_PROFILE_OLD:
2198 /* 8 bits, 2*16, old keypad */
2199 if (keypad_type < 0)
2200 keypad_type = KEYPAD_TYPE_OLD;
2202 lcd_type = LCD_TYPE_OLD;
2208 case PANEL_PROFILE_NEW:
2209 /* serial, 2*16, new keypad */
2210 if (keypad_type < 0)
2211 keypad_type = KEYPAD_TYPE_NEW;
2213 lcd_type = LCD_TYPE_KS0074;
2215 case PANEL_PROFILE_HANTRONIX:
2216 /* 8 bits, 2*16 hantronix-like, no keypad */
2217 if (keypad_type < 0)
2218 keypad_type = KEYPAD_TYPE_NONE;
2220 lcd_type = LCD_TYPE_HANTRONIX;
2222 case PANEL_PROFILE_NEXCOM:
2223 /* generic 8 bits, 2*16, nexcom keypad, eg. Nexcom. */
2224 if (keypad_type < 0)
2225 keypad_type = KEYPAD_TYPE_NEXCOM;
2227 lcd_type = LCD_TYPE_NEXCOM;
2229 case PANEL_PROFILE_LARGE:
2230 /* 8 bits, 2*40, old keypad */
2231 if (keypad_type < 0)
2232 keypad_type = KEYPAD_TYPE_OLD;
2234 lcd_type = LCD_TYPE_OLD;
2238 lcd_enabled = (lcd_type > 0);
2239 keypad_enabled = (keypad_type > 0);
2241 switch (keypad_type) {
2242 case KEYPAD_TYPE_OLD:
2243 keypad_profile = old_keypad_profile;
2245 case KEYPAD_TYPE_NEW:
2246 keypad_profile = new_keypad_profile;
2248 case KEYPAD_TYPE_NEXCOM:
2249 keypad_profile = nexcom_keypad_profile;
2252 keypad_profile = NULL;
2256 /* tells various subsystems about the fact that we are initializing */
2257 init_in_progress = 1;
2259 if (parport_register_driver(&panel_driver)) {
2260 pr_err("could not register with parport. Aborting.\n");
2264 if (!lcd_enabled && !keypad_enabled) {
2265 /* no device enabled, let's release the parport */
2267 parport_release(pprt);
2268 parport_unregister_device(pprt);
2271 parport_unregister_driver(&panel_driver);
2272 pr_err("driver version " PANEL_VERSION " disabled.\n");
2276 register_reboot_notifier(&panel_notifier);
2279 pr_info("driver version " PANEL_VERSION
2280 " registered on parport%d (io=0x%lx).\n", parport,
2283 pr_info("driver version " PANEL_VERSION
2284 " not yet registered\n");
2285 /* tells various subsystems about the fact that initialization
2287 init_in_progress = 0;
2291 static int __init panel_init_module(void)
2293 return panel_init();
2296 static void __exit panel_cleanup_module(void)
2298 unregister_reboot_notifier(&panel_notifier);
2300 if (scan_timer.function != NULL)
2301 del_timer(&scan_timer);
2304 if (keypad_enabled) {
2305 misc_deregister(&keypad_dev);
2306 keypad_initialized = 0;
2310 panel_lcd_print("\x0cLCD driver " PANEL_VERSION
2311 "\nunloaded.\x1b[Lc\x1b[Lb\x1b[L-");
2312 misc_deregister(&lcd_dev);
2313 lcd_initialized = 0;
2316 /* TODO: free all input signals */
2317 parport_release(pprt);
2318 parport_unregister_device(pprt);
2321 parport_unregister_driver(&panel_driver);
2324 module_init(panel_init_module);
2325 module_exit(panel_cleanup_module);
2326 MODULE_AUTHOR("Willy Tarreau");
2327 MODULE_LICENSE("GPL");