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)
714 if (in_interrupt()) {
717 current->state = TASK_INTERRUPTIBLE;
718 schedule_timeout((ms * HZ + 999) / 1000);
722 /* send a serial byte to the LCD panel. The caller is responsible for locking
724 static void lcd_send_serial(int byte)
728 /* the data bit is set on D0, and the clock on STROBE.
729 * LCD reads D0 on STROBE's rising edge. */
730 for (bit = 0; bit < 8; bit++) {
731 bits.cl = BIT_CLR; /* CLK low */
735 udelay(2); /* maintain the data during 2 us before CLK up */
736 bits.cl = BIT_SET; /* CLK high */
738 udelay(1); /* maintain the strobe during 1 us */
743 /* turn the backlight on or off */
744 static void lcd_backlight(int on)
746 if (lcd_bl_pin == PIN_NONE)
749 /* The backlight is activated by setting the AUTOFEED line to +5V */
750 spin_lock_irq(&pprt_lock);
753 spin_unlock_irq(&pprt_lock);
756 /* send a command to the LCD panel in serial mode */
757 static void lcd_write_cmd_s(int cmd)
759 spin_lock_irq(&pprt_lock);
760 lcd_send_serial(0x1F); /* R/W=W, RS=0 */
761 lcd_send_serial(cmd & 0x0F);
762 lcd_send_serial((cmd >> 4) & 0x0F);
763 udelay(40); /* the shortest command takes at least 40 us */
764 spin_unlock_irq(&pprt_lock);
767 /* send data to the LCD panel in serial mode */
768 static void lcd_write_data_s(int data)
770 spin_lock_irq(&pprt_lock);
771 lcd_send_serial(0x5F); /* R/W=W, RS=1 */
772 lcd_send_serial(data & 0x0F);
773 lcd_send_serial((data >> 4) & 0x0F);
774 udelay(40); /* the shortest data takes at least 40 us */
775 spin_unlock_irq(&pprt_lock);
778 /* send a command to the LCD panel in 8 bits parallel mode */
779 static void lcd_write_cmd_p8(int cmd)
781 spin_lock_irq(&pprt_lock);
782 /* present the data to the data port */
784 udelay(20); /* maintain the data during 20 us before the strobe */
791 udelay(40); /* maintain the strobe during 40 us */
796 udelay(120); /* the shortest command takes at least 120 us */
797 spin_unlock_irq(&pprt_lock);
800 /* send data to the LCD panel in 8 bits parallel mode */
801 static void lcd_write_data_p8(int data)
803 spin_lock_irq(&pprt_lock);
804 /* present the data to the data port */
806 udelay(20); /* maintain the data during 20 us before the strobe */
813 udelay(40); /* maintain the strobe during 40 us */
818 udelay(45); /* the shortest data takes at least 45 us */
819 spin_unlock_irq(&pprt_lock);
822 /* send a command to the TI LCD panel */
823 static void lcd_write_cmd_tilcd(int cmd)
825 spin_lock_irq(&pprt_lock);
826 /* present the data to the control port */
829 spin_unlock_irq(&pprt_lock);
832 /* send data to the TI LCD panel */
833 static void lcd_write_data_tilcd(int data)
835 spin_lock_irq(&pprt_lock);
836 /* present the data to the data port */
839 spin_unlock_irq(&pprt_lock);
842 static void lcd_gotoxy(void)
844 lcd_write_cmd(0x80 /* set DDRAM address */
845 | (lcd_addr_y ? lcd_hwidth : 0)
846 /* we force the cursor to stay at the end of the
847 line if it wants to go farther */
848 | ((lcd_addr_x < lcd_bwidth) ? lcd_addr_x &
849 (lcd_hwidth - 1) : lcd_bwidth - 1));
852 static void lcd_print(char c)
854 if (lcd_addr_x < lcd_bwidth) {
855 if (lcd_char_conv != NULL)
856 c = lcd_char_conv[(unsigned char)c];
860 /* prevents the cursor from wrapping onto the next line */
861 if (lcd_addr_x == lcd_bwidth)
865 /* fills the display with spaces and resets X/Y */
866 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)
891 lcd_addr_x = lcd_addr_y = 0;
894 spin_lock_irq(&pprt_lock);
895 for (pos = 0; pos < lcd_height * lcd_hwidth; pos++) {
896 /* present the data to the data port */
899 /* maintain the data during 20 us before the strobe */
907 /* maintain the strobe during 40 us */
913 /* the shortest data takes at least 45 us */
916 spin_unlock_irq(&pprt_lock);
918 lcd_addr_x = lcd_addr_y = 0;
922 /* fills the display with spaces and resets X/Y */
923 static void lcd_clear_fast_tilcd(void)
927 lcd_addr_x = lcd_addr_y = 0;
930 spin_lock_irq(&pprt_lock);
931 for (pos = 0; pos < lcd_height * lcd_hwidth; pos++) {
932 /* present the data to the data port */
937 spin_unlock_irq(&pprt_lock);
939 lcd_addr_x = lcd_addr_y = 0;
943 /* clears the display and resets X/Y */
944 static void lcd_clear_display(void)
946 lcd_write_cmd(0x01); /* clear display */
947 lcd_addr_x = lcd_addr_y = 0;
948 /* we must wait a few milliseconds (15) */
952 static void lcd_init_display(void)
954 lcd_flags = ((lcd_height > 1) ? LCD_FLAG_N : 0)
955 | LCD_FLAG_D | LCD_FLAG_C | LCD_FLAG_B;
957 long_sleep(20); /* wait 20 ms after power-up for the paranoid */
959 lcd_write_cmd(0x30); /* 8bits, 1 line, small fonts */
961 lcd_write_cmd(0x30); /* 8bits, 1 line, small fonts */
963 lcd_write_cmd(0x30); /* 8bits, 1 line, small fonts */
966 lcd_write_cmd(0x30 /* set font height and lines number */
967 | ((lcd_flags & LCD_FLAG_F) ? 4 : 0)
968 | ((lcd_flags & LCD_FLAG_N) ? 8 : 0)
972 lcd_write_cmd(0x08); /* display off, cursor off, blink off */
975 lcd_write_cmd(0x08 /* set display mode */
976 | ((lcd_flags & LCD_FLAG_D) ? 4 : 0)
977 | ((lcd_flags & LCD_FLAG_C) ? 2 : 0)
978 | ((lcd_flags & LCD_FLAG_B) ? 1 : 0)
981 lcd_backlight((lcd_flags & LCD_FLAG_L) ? 1 : 0);
985 /* entry mode set : increment, cursor shifting */
992 * These are the file operation function for user access to /dev/lcd
993 * This function can also be called from inside the kernel, by
994 * setting file and ppos to NULL.
998 static inline int handle_lcd_special_code(void)
1000 /* LCD special codes */
1004 char *esc = lcd_escape + 2;
1005 int oldflags = lcd_flags;
1007 /* check for display mode flags */
1009 case 'D': /* Display ON */
1010 lcd_flags |= LCD_FLAG_D;
1013 case 'd': /* Display OFF */
1014 lcd_flags &= ~LCD_FLAG_D;
1017 case 'C': /* Cursor ON */
1018 lcd_flags |= LCD_FLAG_C;
1021 case 'c': /* Cursor OFF */
1022 lcd_flags &= ~LCD_FLAG_C;
1025 case 'B': /* Blink ON */
1026 lcd_flags |= LCD_FLAG_B;
1029 case 'b': /* Blink OFF */
1030 lcd_flags &= ~LCD_FLAG_B;
1033 case '+': /* Back light ON */
1034 lcd_flags |= LCD_FLAG_L;
1037 case '-': /* Back light OFF */
1038 lcd_flags &= ~LCD_FLAG_L;
1042 /* flash back light using the keypad timer */
1043 if (scan_timer.function != NULL) {
1044 if (light_tempo == 0 && ((lcd_flags & LCD_FLAG_L) == 0))
1046 light_tempo = FLASH_LIGHT_TEMPO;
1050 case 'f': /* Small Font */
1051 lcd_flags &= ~LCD_FLAG_F;
1054 case 'F': /* Large Font */
1055 lcd_flags |= LCD_FLAG_F;
1058 case 'n': /* One Line */
1059 lcd_flags &= ~LCD_FLAG_N;
1062 case 'N': /* Two Lines */
1063 lcd_flags |= LCD_FLAG_N;
1065 case 'l': /* Shift Cursor Left */
1066 if (lcd_addr_x > 0) {
1067 /* back one char if not at end of line */
1068 if (lcd_addr_x < lcd_bwidth)
1069 lcd_write_cmd(0x10);
1074 case 'r': /* shift cursor right */
1075 if (lcd_addr_x < lcd_width) {
1076 /* allow the cursor to pass the end of the line */
1079 lcd_write_cmd(0x14);
1084 case 'L': /* shift display left */
1086 lcd_write_cmd(0x18);
1089 case 'R': /* shift display right */
1091 lcd_write_cmd(0x1C);
1094 case 'k': { /* kill end of line */
1097 for (x = lcd_addr_x; x < lcd_bwidth; x++)
1098 lcd_write_data(' ');
1100 /* restore cursor position */
1105 case 'I': /* reinitialize display */
1111 /* Generator : LGcxxxxx...xx; must have <c> between '0'
1112 * and '7', representing the numerical ASCII code of the
1113 * redefined character, and <xx...xx> a sequence of 16
1114 * hex digits representing 8 bytes for each character.
1115 * Most LCDs will only use 5 lower bits of the 7 first
1119 unsigned char cgbytes[8];
1120 unsigned char cgaddr;
1126 if (strchr(esc, ';') == NULL)
1131 cgaddr = *(esc++) - '0';
1140 while (*esc && cgoffset < 8) {
1142 if (*esc >= '0' && *esc <= '9') {
1143 value |= (*esc - '0') << shift;
1144 } else if (*esc >= 'A' && *esc <= 'Z') {
1145 value |= (*esc - 'A' + 10) << shift;
1146 } else if (*esc >= 'a' && *esc <= 'z') {
1147 value |= (*esc - 'a' + 10) << shift;
1154 cgbytes[cgoffset++] = value;
1161 lcd_write_cmd(0x40 | (cgaddr * 8));
1162 for (addr = 0; addr < cgoffset; addr++)
1163 lcd_write_data(cgbytes[addr]);
1165 /* ensures that we stop writing to CGRAM */
1170 case 'x': /* gotoxy : LxXXX[yYYY]; */
1171 case 'y': /* gotoxy : LyYYY[xXXX]; */
1172 if (strchr(esc, ';') == NULL)
1178 if (kstrtoul(esc, 10, &lcd_addr_x) < 0)
1180 } else if (*esc == 'y') {
1182 if (kstrtoul(esc, 10, &lcd_addr_y) < 0)
1194 /* Check whether one flag was changed */
1195 if (oldflags != lcd_flags) {
1196 /* check whether one of B,C,D flags were changed */
1197 if ((oldflags ^ lcd_flags) &
1198 (LCD_FLAG_B | LCD_FLAG_C | LCD_FLAG_D))
1199 /* set display mode */
1201 | ((lcd_flags & LCD_FLAG_D) ? 4 : 0)
1202 | ((lcd_flags & LCD_FLAG_C) ? 2 : 0)
1203 | ((lcd_flags & LCD_FLAG_B) ? 1 : 0));
1204 /* check whether one of F,N flags was changed */
1205 else if ((oldflags ^ lcd_flags) & (LCD_FLAG_F | LCD_FLAG_N))
1207 | ((lcd_flags & LCD_FLAG_F) ? 4 : 0)
1208 | ((lcd_flags & LCD_FLAG_N) ? 8 : 0));
1209 /* check whether L flag was changed */
1210 else if ((oldflags ^ lcd_flags) & (LCD_FLAG_L)) {
1211 if (lcd_flags & (LCD_FLAG_L))
1213 else if (light_tempo == 0)
1214 /* switch off the light only when the tempo
1223 static void lcd_write_char(char c)
1225 /* first, we'll test if we're in escape mode */
1226 if ((c != '\n') && lcd_escape_len >= 0) {
1227 /* yes, let's add this char to the buffer */
1228 lcd_escape[lcd_escape_len++] = c;
1229 lcd_escape[lcd_escape_len] = 0;
1231 /* aborts any previous escape sequence */
1232 lcd_escape_len = -1;
1235 case LCD_ESCAPE_CHAR:
1236 /* start of an escape sequence */
1238 lcd_escape[lcd_escape_len] = 0;
1241 /* go back one char and clear it */
1242 if (lcd_addr_x > 0) {
1243 /* check if we're not at the
1245 if (lcd_addr_x < lcd_bwidth)
1247 lcd_write_cmd(0x10);
1250 /* replace with a space */
1251 lcd_write_data(' ');
1252 /* back one char again */
1253 lcd_write_cmd(0x10);
1256 /* quickly clear the display */
1260 /* flush the remainder of the current line and
1261 go to the beginning of the next line */
1262 for (; lcd_addr_x < lcd_bwidth; lcd_addr_x++)
1263 lcd_write_data(' ');
1265 lcd_addr_y = (lcd_addr_y + 1) % lcd_height;
1269 /* go to the beginning of the same line */
1274 /* print a space instead of the tab */
1278 /* simply print this char */
1284 /* now we'll see if we're in an escape mode and if the current
1285 escape sequence can be understood. */
1286 if (lcd_escape_len >= 2) {
1289 if (!strcmp(lcd_escape, "[2J")) {
1290 /* clear the display */
1293 } else if (!strcmp(lcd_escape, "[H")) {
1294 /* cursor to home */
1295 lcd_addr_x = lcd_addr_y = 0;
1299 /* codes starting with ^[[L */
1300 else if ((lcd_escape_len >= 3) &&
1301 (lcd_escape[0] == '[') &&
1302 (lcd_escape[1] == 'L')) {
1303 processed = handle_lcd_special_code();
1306 /* LCD special escape codes */
1307 /* flush the escape sequence if it's been processed
1308 or if it is getting too long. */
1309 if (processed || (lcd_escape_len >= LCD_ESCAPE_LEN))
1310 lcd_escape_len = -1;
1311 } /* escape codes */
1314 static ssize_t lcd_write(struct file *file,
1315 const char __user *buf, size_t count, loff_t *ppos)
1317 const char __user *tmp = buf;
1320 for (; count-- > 0; (*ppos)++, tmp++) {
1321 if (!in_interrupt() && (((count + 1) & 0x1f) == 0))
1322 /* let's be a little nice with other processes
1323 that need some CPU */
1326 if (get_user(c, tmp))
1335 static int lcd_open(struct inode *inode, struct file *file)
1338 return -EBUSY; /* open only once at a time */
1340 if (file->f_mode & FMODE_READ) /* device is write-only */
1343 if (lcd_must_clear) {
1344 lcd_clear_display();
1348 return nonseekable_open(inode, file);
1351 static int lcd_release(struct inode *inode, struct file *file)
1357 static const struct file_operations lcd_fops = {
1360 .release = lcd_release,
1361 .llseek = no_llseek,
1364 static struct miscdevice lcd_dev = {
1370 /* public function usable from the kernel for any purpose */
1371 static void panel_lcd_print(const char *s)
1373 const char *tmp = s;
1374 int count = strlen(s);
1376 if (lcd_enabled && lcd_initialized) {
1377 for (; count-- > 0; tmp++) {
1378 if (!in_interrupt() && (((count + 1) & 0x1f) == 0))
1379 /* let's be a little nice with other processes
1380 that need some CPU */
1383 lcd_write_char(*tmp);
1388 /* initialize the LCD driver */
1389 static void lcd_init(void)
1393 /* parallel mode, 8 bits */
1395 lcd_proto = LCD_PROTO_PARALLEL;
1396 if (lcd_charset < 0)
1397 lcd_charset = LCD_CHARSET_NORMAL;
1398 if (lcd_e_pin == PIN_NOT_SET)
1399 lcd_e_pin = PIN_STROBE;
1400 if (lcd_rs_pin == PIN_NOT_SET)
1401 lcd_rs_pin = PIN_AUTOLF;
1412 case LCD_TYPE_KS0074:
1413 /* serial mode, ks0074 */
1415 lcd_proto = LCD_PROTO_SERIAL;
1416 if (lcd_charset < 0)
1417 lcd_charset = LCD_CHARSET_KS0074;
1418 if (lcd_bl_pin == PIN_NOT_SET)
1419 lcd_bl_pin = PIN_AUTOLF;
1420 if (lcd_cl_pin == PIN_NOT_SET)
1421 lcd_cl_pin = PIN_STROBE;
1422 if (lcd_da_pin == PIN_NOT_SET)
1423 lcd_da_pin = PIN_D0;
1434 case LCD_TYPE_NEXCOM:
1435 /* parallel mode, 8 bits, generic */
1437 lcd_proto = LCD_PROTO_PARALLEL;
1438 if (lcd_charset < 0)
1439 lcd_charset = LCD_CHARSET_NORMAL;
1440 if (lcd_e_pin == PIN_NOT_SET)
1441 lcd_e_pin = PIN_AUTOLF;
1442 if (lcd_rs_pin == PIN_NOT_SET)
1443 lcd_rs_pin = PIN_SELECP;
1444 if (lcd_rw_pin == PIN_NOT_SET)
1445 lcd_rw_pin = PIN_INITP;
1456 case LCD_TYPE_CUSTOM:
1457 /* customer-defined */
1459 lcd_proto = DEFAULT_LCD_PROTO;
1460 if (lcd_charset < 0)
1461 lcd_charset = DEFAULT_LCD_CHARSET;
1462 /* default geometry will be set later */
1464 case LCD_TYPE_HANTRONIX:
1465 /* parallel mode, 8 bits, hantronix-like */
1468 lcd_proto = LCD_PROTO_PARALLEL;
1469 if (lcd_charset < 0)
1470 lcd_charset = LCD_CHARSET_NORMAL;
1471 if (lcd_e_pin == PIN_NOT_SET)
1472 lcd_e_pin = PIN_STROBE;
1473 if (lcd_rs_pin == PIN_NOT_SET)
1474 lcd_rs_pin = PIN_SELECP;
1487 /* this is used to catch wrong and default values */
1489 lcd_width = DEFAULT_LCD_WIDTH;
1490 if (lcd_bwidth <= 0)
1491 lcd_bwidth = DEFAULT_LCD_BWIDTH;
1492 if (lcd_hwidth <= 0)
1493 lcd_hwidth = DEFAULT_LCD_HWIDTH;
1494 if (lcd_height <= 0)
1495 lcd_height = DEFAULT_LCD_HEIGHT;
1497 if (lcd_proto == LCD_PROTO_SERIAL) { /* SERIAL */
1498 lcd_write_cmd = lcd_write_cmd_s;
1499 lcd_write_data = lcd_write_data_s;
1500 lcd_clear_fast = lcd_clear_fast_s;
1502 if (lcd_cl_pin == PIN_NOT_SET)
1503 lcd_cl_pin = DEFAULT_LCD_PIN_SCL;
1504 if (lcd_da_pin == PIN_NOT_SET)
1505 lcd_da_pin = DEFAULT_LCD_PIN_SDA;
1507 } else if (lcd_proto == LCD_PROTO_PARALLEL) { /* PARALLEL */
1508 lcd_write_cmd = lcd_write_cmd_p8;
1509 lcd_write_data = lcd_write_data_p8;
1510 lcd_clear_fast = lcd_clear_fast_p8;
1512 if (lcd_e_pin == PIN_NOT_SET)
1513 lcd_e_pin = DEFAULT_LCD_PIN_E;
1514 if (lcd_rs_pin == PIN_NOT_SET)
1515 lcd_rs_pin = DEFAULT_LCD_PIN_RS;
1516 if (lcd_rw_pin == PIN_NOT_SET)
1517 lcd_rw_pin = DEFAULT_LCD_PIN_RW;
1519 lcd_write_cmd = lcd_write_cmd_tilcd;
1520 lcd_write_data = lcd_write_data_tilcd;
1521 lcd_clear_fast = lcd_clear_fast_tilcd;
1524 if (lcd_bl_pin == PIN_NOT_SET)
1525 lcd_bl_pin = DEFAULT_LCD_PIN_BL;
1527 if (lcd_e_pin == PIN_NOT_SET)
1528 lcd_e_pin = PIN_NONE;
1529 if (lcd_rs_pin == PIN_NOT_SET)
1530 lcd_rs_pin = PIN_NONE;
1531 if (lcd_rw_pin == PIN_NOT_SET)
1532 lcd_rw_pin = PIN_NONE;
1533 if (lcd_bl_pin == PIN_NOT_SET)
1534 lcd_bl_pin = PIN_NONE;
1535 if (lcd_cl_pin == PIN_NOT_SET)
1536 lcd_cl_pin = PIN_NONE;
1537 if (lcd_da_pin == PIN_NOT_SET)
1538 lcd_da_pin = PIN_NONE;
1540 if (lcd_charset < 0)
1541 lcd_charset = DEFAULT_LCD_CHARSET;
1543 if (lcd_charset == LCD_CHARSET_KS0074)
1544 lcd_char_conv = lcd_char_conv_ks0074;
1546 lcd_char_conv = NULL;
1548 if (lcd_bl_pin != PIN_NONE)
1551 pin_to_bits(lcd_e_pin, lcd_bits[LCD_PORT_D][LCD_BIT_E],
1552 lcd_bits[LCD_PORT_C][LCD_BIT_E]);
1553 pin_to_bits(lcd_rs_pin, lcd_bits[LCD_PORT_D][LCD_BIT_RS],
1554 lcd_bits[LCD_PORT_C][LCD_BIT_RS]);
1555 pin_to_bits(lcd_rw_pin, lcd_bits[LCD_PORT_D][LCD_BIT_RW],
1556 lcd_bits[LCD_PORT_C][LCD_BIT_RW]);
1557 pin_to_bits(lcd_bl_pin, lcd_bits[LCD_PORT_D][LCD_BIT_BL],
1558 lcd_bits[LCD_PORT_C][LCD_BIT_BL]);
1559 pin_to_bits(lcd_cl_pin, lcd_bits[LCD_PORT_D][LCD_BIT_CL],
1560 lcd_bits[LCD_PORT_C][LCD_BIT_CL]);
1561 pin_to_bits(lcd_da_pin, lcd_bits[LCD_PORT_D][LCD_BIT_DA],
1562 lcd_bits[LCD_PORT_C][LCD_BIT_DA]);
1564 /* before this line, we must NOT send anything to the display.
1565 * Since lcd_init_display() needs to write data, we have to
1566 * enable mark the LCD initialized just before. */
1567 lcd_initialized = 1;
1570 /* display a short message */
1571 #ifdef CONFIG_PANEL_CHANGE_MESSAGE
1572 #ifdef CONFIG_PANEL_BOOT_MESSAGE
1573 panel_lcd_print("\x1b[Lc\x1b[Lb\x1b[L*" CONFIG_PANEL_BOOT_MESSAGE);
1576 panel_lcd_print("\x1b[Lc\x1b[Lb\x1b[L*Linux-" UTS_RELEASE "\nPanel-"
1579 lcd_addr_x = lcd_addr_y = 0;
1580 /* clear the display on the next device opening */
1586 * These are the file operation function for user access to /dev/keypad
1589 static ssize_t keypad_read(struct file *file,
1590 char __user *buf, size_t count, loff_t *ppos)
1593 char __user *tmp = buf;
1595 if (keypad_buflen == 0) {
1596 if (file->f_flags & O_NONBLOCK)
1599 if (wait_event_interruptible(keypad_read_wait,
1600 keypad_buflen != 0))
1604 for (; count-- > 0 && (keypad_buflen > 0);
1605 ++i, ++tmp, --keypad_buflen) {
1606 put_user(keypad_buffer[keypad_start], tmp);
1607 keypad_start = (keypad_start + 1) % KEYPAD_BUFFER;
1614 static int keypad_open(struct inode *inode, struct file *file)
1616 if (keypad_open_cnt)
1617 return -EBUSY; /* open only once at a time */
1619 if (file->f_mode & FMODE_WRITE) /* device is read-only */
1622 keypad_buflen = 0; /* flush the buffer on opening */
1627 static int keypad_release(struct inode *inode, struct file *file)
1633 static const struct file_operations keypad_fops = {
1634 .read = keypad_read, /* read */
1635 .open = keypad_open, /* open */
1636 .release = keypad_release, /* close */
1637 .llseek = default_llseek,
1640 static struct miscdevice keypad_dev = {
1646 static void keypad_send_key(const char *string, int max_len)
1648 if (init_in_progress)
1651 /* send the key to the device only if a process is attached to it. */
1652 if (keypad_open_cnt > 0) {
1653 while (max_len-- && keypad_buflen < KEYPAD_BUFFER && *string) {
1654 keypad_buffer[(keypad_start + keypad_buflen++) %
1655 KEYPAD_BUFFER] = *string++;
1657 wake_up_interruptible(&keypad_read_wait);
1661 /* this function scans all the bits involving at least one logical signal,
1662 * and puts the results in the bitfield "phys_read" (one bit per established
1663 * contact), and sets "phys_read_prev" to "phys_read".
1665 * Note: to debounce input signals, we will only consider as switched a signal
1666 * which is stable across 2 measures. Signals which are different between two
1667 * reads will be kept as they previously were in their logical form (phys_prev).
1668 * A signal which has just switched will have a 1 in
1669 * (phys_read ^ phys_read_prev).
1671 static void phys_scan_contacts(void)
1678 phys_prev = phys_curr;
1679 phys_read_prev = phys_read;
1680 phys_read = 0; /* flush all signals */
1682 /* keep track of old value, with all outputs disabled */
1683 oldval = r_dtr(pprt) | scan_mask_o;
1684 /* activate all keyboard outputs (active low) */
1685 w_dtr(pprt, oldval & ~scan_mask_o);
1687 /* will have a 1 for each bit set to gnd */
1688 bitmask = PNL_PINPUT(r_str(pprt)) & scan_mask_i;
1689 /* disable all matrix signals */
1690 w_dtr(pprt, oldval);
1692 /* now that all outputs are cleared, the only active input bits are
1693 * directly connected to the ground
1696 /* 1 for each grounded input */
1697 gndmask = PNL_PINPUT(r_str(pprt)) & scan_mask_i;
1699 /* grounded inputs are signals 40-44 */
1700 phys_read |= (pmask_t) gndmask << 40;
1702 if (bitmask != gndmask) {
1703 /* since clearing the outputs changed some inputs, we know
1704 * that some input signals are currently tied to some outputs.
1705 * So we'll scan them.
1707 for (bit = 0; bit < 8; bit++) {
1710 if (!(scan_mask_o & bitval)) /* skip unused bits */
1713 w_dtr(pprt, oldval & ~bitval); /* enable this output */
1714 bitmask = PNL_PINPUT(r_str(pprt)) & ~gndmask;
1715 phys_read |= (pmask_t) bitmask << (5 * bit);
1717 w_dtr(pprt, oldval); /* disable all outputs */
1719 /* this is easy: use old bits when they are flapping,
1720 * use new ones when stable */
1721 phys_curr = (phys_prev & (phys_read ^ phys_read_prev)) |
1722 (phys_read & ~(phys_read ^ phys_read_prev));
1725 static inline int input_state_high(struct logical_input *input)
1729 * this is an invalid test. It tries to catch
1730 * transitions from single-key to multiple-key, but
1731 * doesn't take into account the contacts polarity.
1732 * The only solution to the problem is to parse keys
1733 * from the most complex to the simplest combinations,
1734 * and mark them as 'caught' once a combination
1735 * matches, then unmatch it for all other ones.
1738 /* try to catch dangerous transitions cases :
1739 * someone adds a bit, so this signal was a false
1740 * positive resulting from a transition. We should
1741 * invalidate the signal immediately and not call the
1743 * eg: 0 -(press A)-> A -(press B)-> AB : don't match A's release.
1745 if (((phys_prev & input->mask) == input->value) &&
1746 ((phys_curr & input->mask) > input->value)) {
1747 input->state = INPUT_ST_LOW; /* invalidate */
1752 if ((phys_curr & input->mask) == input->value) {
1753 if ((input->type == INPUT_TYPE_STD) &&
1754 (input->high_timer == 0)) {
1755 input->high_timer++;
1756 if (input->u.std.press_fct != NULL)
1757 input->u.std.press_fct(input->u.std.press_data);
1758 } else if (input->type == INPUT_TYPE_KBD) {
1759 /* will turn on the light */
1762 if (input->high_timer == 0) {
1763 char *press_str = input->u.kbd.press_str;
1766 int s = sizeof(input->u.kbd.press_str);
1768 keypad_send_key(press_str, s);
1772 if (input->u.kbd.repeat_str[0]) {
1773 char *repeat_str = input->u.kbd.repeat_str;
1775 if (input->high_timer >= KEYPAD_REP_START) {
1776 int s = sizeof(input->u.kbd.repeat_str);
1778 input->high_timer -= KEYPAD_REP_DELAY;
1779 keypad_send_key(repeat_str, s);
1781 /* we will need to come back here soon */
1785 if (input->high_timer < 255)
1786 input->high_timer++;
1790 /* else signal falling down. Let's fall through. */
1791 input->state = INPUT_ST_FALLING;
1792 input->fall_timer = 0;
1797 static inline void input_state_falling(struct logical_input *input)
1800 /* FIXME !!! same comment as in input_state_high */
1801 if (((phys_prev & input->mask) == input->value) &&
1802 ((phys_curr & input->mask) > input->value)) {
1803 input->state = INPUT_ST_LOW; /* invalidate */
1808 if ((phys_curr & input->mask) == input->value) {
1809 if (input->type == INPUT_TYPE_KBD) {
1810 /* will turn on the light */
1813 if (input->u.kbd.repeat_str[0]) {
1814 char *repeat_str = input->u.kbd.repeat_str;
1816 if (input->high_timer >= KEYPAD_REP_START) {
1817 int s = sizeof(input->u.kbd.repeat_str);
1819 input->high_timer -= KEYPAD_REP_DELAY;
1820 keypad_send_key(repeat_str, s);
1822 /* we will need to come back here soon */
1826 if (input->high_timer < 255)
1827 input->high_timer++;
1829 input->state = INPUT_ST_HIGH;
1830 } else if (input->fall_timer >= input->fall_time) {
1831 /* call release event */
1832 if (input->type == INPUT_TYPE_STD) {
1833 void (*release_fct)(int) = input->u.std.release_fct;
1835 if (release_fct != NULL)
1836 release_fct(input->u.std.release_data);
1837 } else if (input->type == INPUT_TYPE_KBD) {
1838 char *release_str = input->u.kbd.release_str;
1840 if (release_str[0]) {
1841 int s = sizeof(input->u.kbd.release_str);
1843 keypad_send_key(release_str, s);
1847 input->state = INPUT_ST_LOW;
1849 input->fall_timer++;
1854 static void panel_process_inputs(void)
1856 struct list_head *item;
1857 struct logical_input *input;
1861 list_for_each(item, &logical_inputs) {
1862 input = list_entry(item, struct logical_input, list);
1864 switch (input->state) {
1866 if ((phys_curr & input->mask) != input->value)
1868 /* if all needed ones were already set previously,
1869 * this means that this logical signal has been
1870 * activated by the releasing of another combined
1871 * signal, so we don't want to match.
1872 * eg: AB -(release B)-> A -(release A)-> 0 :
1875 if ((phys_prev & input->mask) == input->value)
1877 input->rise_timer = 0;
1878 input->state = INPUT_ST_RISING;
1879 /* no break here, fall through */
1880 case INPUT_ST_RISING:
1881 if ((phys_curr & input->mask) != input->value) {
1882 input->state = INPUT_ST_LOW;
1885 if (input->rise_timer < input->rise_time) {
1887 input->rise_timer++;
1890 input->high_timer = 0;
1891 input->state = INPUT_ST_HIGH;
1892 /* no break here, fall through */
1894 if (input_state_high(input))
1896 /* no break here, fall through */
1897 case INPUT_ST_FALLING:
1898 input_state_falling(input);
1903 static void panel_scan_timer(void)
1905 if (keypad_enabled && keypad_initialized) {
1906 if (spin_trylock_irq(&pprt_lock)) {
1907 phys_scan_contacts();
1909 /* no need for the parport anymore */
1910 spin_unlock_irq(&pprt_lock);
1913 if (!inputs_stable || phys_curr != phys_prev)
1914 panel_process_inputs();
1917 if (lcd_enabled && lcd_initialized) {
1919 if (light_tempo == 0 && ((lcd_flags & LCD_FLAG_L) == 0))
1921 light_tempo = FLASH_LIGHT_TEMPO;
1922 } else if (light_tempo > 0) {
1924 if (light_tempo == 0 && ((lcd_flags & LCD_FLAG_L) == 0))
1929 mod_timer(&scan_timer, jiffies + INPUT_POLL_TIME);
1932 static void init_scan_timer(void)
1934 if (scan_timer.function != NULL)
1935 return; /* already started */
1937 init_timer(&scan_timer);
1938 scan_timer.expires = jiffies + INPUT_POLL_TIME;
1939 scan_timer.data = 0;
1940 scan_timer.function = (void *)&panel_scan_timer;
1941 add_timer(&scan_timer);
1944 /* converts a name of the form "({BbAaPpSsEe}{01234567-})*" to a series of bits.
1945 * if <omask> or <imask> are non-null, they will be or'ed with the bits
1946 * corresponding to out and in bits respectively.
1947 * returns 1 if ok, 0 if error (in which case, nothing is written).
1949 static int input_name2mask(const char *name, pmask_t *mask, pmask_t *value,
1950 char *imask, char *omask)
1952 static char sigtab[10] = "EeSsPpAaBb";
1956 om = im = m = v = 0ULL;
1958 int in, out, bit, neg;
1960 for (in = 0; (in < sizeof(sigtab)) && (sigtab[in] != *name);
1964 if (in >= sizeof(sigtab))
1965 return 0; /* input name not found */
1966 neg = (in & 1); /* odd (lower) names are negated */
1971 if (isdigit(*name)) {
1974 } else if (*name == '-') {
1977 return 0; /* unknown bit name */
1980 bit = (out * 5) + in;
1996 /* tries to bind a key to the signal name <name>. The key will send the
1997 * strings <press>, <repeat>, <release> for these respective events.
1998 * Returns the pointer to the new key if ok, NULL if the key could not be bound.
2000 static struct logical_input *panel_bind_key(const char *name, const char *press,
2002 const char *release)
2004 struct logical_input *key;
2006 key = kzalloc(sizeof(*key), GFP_KERNEL);
2010 if (!input_name2mask(name, &key->mask, &key->value, &scan_mask_i,
2016 key->type = INPUT_TYPE_KBD;
2017 key->state = INPUT_ST_LOW;
2021 strncpy(key->u.kbd.press_str, press, sizeof(key->u.kbd.press_str));
2022 strncpy(key->u.kbd.repeat_str, repeat, sizeof(key->u.kbd.repeat_str));
2023 strncpy(key->u.kbd.release_str, release,
2024 sizeof(key->u.kbd.release_str));
2025 list_add(&key->list, &logical_inputs);
2030 /* tries to bind a callback function to the signal name <name>. The function
2031 * <press_fct> will be called with the <press_data> arg when the signal is
2032 * activated, and so on for <release_fct>/<release_data>
2033 * Returns the pointer to the new signal if ok, NULL if the signal could not
2036 static struct logical_input *panel_bind_callback(char *name,
2037 void (*press_fct)(int),
2039 void (*release_fct)(int),
2042 struct logical_input *callback;
2044 callback = kmalloc(sizeof(*callback), GFP_KERNEL);
2048 memset(callback, 0, sizeof(struct logical_input));
2049 if (!input_name2mask(name, &callback->mask, &callback->value,
2050 &scan_mask_i, &scan_mask_o))
2053 callback->type = INPUT_TYPE_STD;
2054 callback->state = INPUT_ST_LOW;
2055 callback->rise_time = 1;
2056 callback->fall_time = 1;
2057 callback->u.std.press_fct = press_fct;
2058 callback->u.std.press_data = press_data;
2059 callback->u.std.release_fct = release_fct;
2060 callback->u.std.release_data = release_data;
2061 list_add(&callback->list, &logical_inputs);
2066 static void keypad_init(void)
2070 init_waitqueue_head(&keypad_read_wait);
2071 keypad_buflen = 0; /* flushes any eventual noisy keystroke */
2073 /* Let's create all known keys */
2075 for (keynum = 0; keypad_profile[keynum][0][0]; keynum++) {
2076 panel_bind_key(keypad_profile[keynum][0],
2077 keypad_profile[keynum][1],
2078 keypad_profile[keynum][2],
2079 keypad_profile[keynum][3]);
2083 keypad_initialized = 1;
2086 /**************************************************/
2087 /* device initialization */
2088 /**************************************************/
2090 static int panel_notify_sys(struct notifier_block *this, unsigned long code,
2093 if (lcd_enabled && lcd_initialized) {
2097 ("\x0cReloading\nSystem...\x1b[Lc\x1b[Lb\x1b[L+");
2101 ("\x0cSystem Halted.\x1b[Lc\x1b[Lb\x1b[L+");
2104 panel_lcd_print("\x0cPower off.\x1b[Lc\x1b[Lb\x1b[L+");
2113 static struct notifier_block panel_notifier = {
2119 static void panel_attach(struct parport *port)
2121 if (port->number != parport)
2125 pr_err("%s: port->number=%d parport=%d, already registered!\n",
2126 __func__, port->number, parport);
2130 pprt = parport_register_device(port, "panel", NULL, NULL, /* pf, kf */
2132 /*PARPORT_DEV_EXCL */
2135 pr_err("%s: port->number=%d parport=%d, parport_register_device() failed\n",
2136 __func__, port->number, parport);
2140 if (parport_claim(pprt)) {
2141 pr_err("could not claim access to parport%d. Aborting.\n",
2143 goto err_unreg_device;
2146 /* must init LCD first, just in case an IRQ from the keypad is
2147 * generated at keypad init
2151 if (misc_register(&lcd_dev))
2152 goto err_unreg_device;
2155 if (keypad_enabled) {
2157 if (misc_register(&keypad_dev))
2164 misc_deregister(&lcd_dev);
2166 parport_unregister_device(pprt);
2170 static void panel_detach(struct parport *port)
2172 if (port->number != parport)
2176 pr_err("%s: port->number=%d parport=%d, nothing to unregister.\n",
2177 __func__, port->number, parport);
2181 if (keypad_enabled && keypad_initialized) {
2182 misc_deregister(&keypad_dev);
2183 keypad_initialized = 0;
2186 if (lcd_enabled && lcd_initialized) {
2187 misc_deregister(&lcd_dev);
2188 lcd_initialized = 0;
2191 parport_release(pprt);
2192 parport_unregister_device(pprt);
2196 static struct parport_driver panel_driver = {
2198 .attach = panel_attach,
2199 .detach = panel_detach,
2203 static int panel_init(void)
2205 /* for backwards compatibility */
2206 if (keypad_type < 0)
2207 keypad_type = keypad_enabled;
2210 lcd_type = lcd_enabled;
2213 parport = DEFAULT_PARPORT;
2215 /* take care of an eventual profile */
2217 case PANEL_PROFILE_CUSTOM:
2218 /* custom profile */
2219 if (keypad_type < 0)
2220 keypad_type = DEFAULT_KEYPAD;
2222 lcd_type = DEFAULT_LCD;
2224 case PANEL_PROFILE_OLD:
2225 /* 8 bits, 2*16, old keypad */
2226 if (keypad_type < 0)
2227 keypad_type = KEYPAD_TYPE_OLD;
2229 lcd_type = LCD_TYPE_OLD;
2235 case PANEL_PROFILE_NEW:
2236 /* serial, 2*16, new keypad */
2237 if (keypad_type < 0)
2238 keypad_type = KEYPAD_TYPE_NEW;
2240 lcd_type = LCD_TYPE_KS0074;
2242 case PANEL_PROFILE_HANTRONIX:
2243 /* 8 bits, 2*16 hantronix-like, no keypad */
2244 if (keypad_type < 0)
2245 keypad_type = KEYPAD_TYPE_NONE;
2247 lcd_type = LCD_TYPE_HANTRONIX;
2249 case PANEL_PROFILE_NEXCOM:
2250 /* generic 8 bits, 2*16, nexcom keypad, eg. Nexcom. */
2251 if (keypad_type < 0)
2252 keypad_type = KEYPAD_TYPE_NEXCOM;
2254 lcd_type = LCD_TYPE_NEXCOM;
2256 case PANEL_PROFILE_LARGE:
2257 /* 8 bits, 2*40, old keypad */
2258 if (keypad_type < 0)
2259 keypad_type = KEYPAD_TYPE_OLD;
2261 lcd_type = LCD_TYPE_OLD;
2265 lcd_enabled = (lcd_type > 0);
2266 keypad_enabled = (keypad_type > 0);
2268 switch (keypad_type) {
2269 case KEYPAD_TYPE_OLD:
2270 keypad_profile = old_keypad_profile;
2272 case KEYPAD_TYPE_NEW:
2273 keypad_profile = new_keypad_profile;
2275 case KEYPAD_TYPE_NEXCOM:
2276 keypad_profile = nexcom_keypad_profile;
2279 keypad_profile = NULL;
2283 /* tells various subsystems about the fact that we are initializing */
2284 init_in_progress = 1;
2286 if (parport_register_driver(&panel_driver)) {
2287 pr_err("could not register with parport. Aborting.\n");
2291 if (!lcd_enabled && !keypad_enabled) {
2292 /* no device enabled, let's release the parport */
2294 parport_release(pprt);
2295 parport_unregister_device(pprt);
2298 parport_unregister_driver(&panel_driver);
2299 pr_err("driver version " PANEL_VERSION " disabled.\n");
2303 register_reboot_notifier(&panel_notifier);
2306 pr_info("driver version " PANEL_VERSION
2307 " registered on parport%d (io=0x%lx).\n", parport,
2310 pr_info("driver version " PANEL_VERSION
2311 " not yet registered\n");
2312 /* tells various subsystems about the fact that initialization
2314 init_in_progress = 0;
2318 static int __init panel_init_module(void)
2320 return panel_init();
2323 static void __exit panel_cleanup_module(void)
2325 unregister_reboot_notifier(&panel_notifier);
2327 if (scan_timer.function != NULL)
2328 del_timer_sync(&scan_timer);
2331 if (keypad_enabled) {
2332 misc_deregister(&keypad_dev);
2333 keypad_initialized = 0;
2337 panel_lcd_print("\x0cLCD driver " PANEL_VERSION
2338 "\nunloaded.\x1b[Lc\x1b[Lb\x1b[L-");
2339 misc_deregister(&lcd_dev);
2340 lcd_initialized = 0;
2343 /* TODO: free all input signals */
2344 parport_release(pprt);
2345 parport_unregister_device(pprt);
2348 parport_unregister_driver(&panel_driver);
2351 module_init(panel_init_module);
2352 module_exit(panel_cleanup_module);
2353 MODULE_AUTHOR("Willy Tarreau");
2354 MODULE_LICENSE("GPL");