1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Front panel driver for Linux
4 * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
5 * Copyright (C) 2016-2017 Glider bvba
6 *
7 * This code drives an LCD module (/dev/lcd), and a keypad (/dev/keypad)
8 * connected to a parallel printer port.
9 *
10 * The LCD module may either be an HD44780-like 8-bit parallel LCD, or a 1-bit
11 * serial module compatible with Samsung's KS0074. The pins may be connected in
12 * any combination, everything is programmable.
13 *
14 * The keypad consists in a matrix of push buttons connecting input pins to
15 * data output pins or to the ground. The combinations have to be hard-coded
16 * in the driver, though several profiles exist and adding new ones is easy.
17 *
18 * Several profiles are provided for commonly found LCD+keypad modules on the
19 * market, such as those found in Nexcom's appliances.
20 *
21 * FIXME:
22 * - the initialization/deinitialization process is very dirty and should
23 * be rewritten. It may even be buggy.
24 *
25 * TODO:
26 * - document 24 keys keyboard (3 rows of 8 cols, 32 diodes + 2 inputs)
27 * - make the LCD a part of a virtual screen of Vx*Vy
28 * - make the inputs list smp-safe
29 * - change the keyboard to a double mapping : signals -> key_id -> values
30 * so that applications can change values without knowing signals
31 *
32 */
33
34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
35
36 #include <linux/module.h>
37
38 #include <linux/types.h>
39 #include <linux/errno.h>
40 #include <linux/signal.h>
41 #include <linux/sched.h>
42 #include <linux/spinlock.h>
43 #include <linux/interrupt.h>
44 #include <linux/miscdevice.h>
45 #include <linux/slab.h>
46 #include <linux/ioport.h>
47 #include <linux/fcntl.h>
48 #include <linux/init.h>
49 #include <linux/delay.h>
50 #include <linux/kernel.h>
51 #include <linux/ctype.h>
52 #include <linux/parport.h>
53 #include <linux/list.h>
54
55 #include <linux/io.h>
56 #include <linux/uaccess.h>
57
58 #include "charlcd.h"
59 #include "hd44780_common.h"
60
61 #define LCD_MAXBYTES 256 /* max burst write */
62
63 #define KEYPAD_BUFFER 64
64
65 /* poll the keyboard this every second */
66 #define INPUT_POLL_TIME (HZ / 50)
67 /* a key starts to repeat after this times INPUT_POLL_TIME */
68 #define KEYPAD_REP_START (10)
69 /* a key repeats this times INPUT_POLL_TIME */
70 #define KEYPAD_REP_DELAY (2)
71
72 /* converts an r_str() input to an active high, bits string : 000BAOSE */
73 #define PNL_PINPUT(a) ((((unsigned char)(a)) ^ 0x7F) >> 3)
74
75 #define PNL_PBUSY 0x80 /* inverted input, active low */
76 #define PNL_PACK 0x40 /* direct input, active low */
77 #define PNL_POUTPA 0x20 /* direct input, active high */
78 #define PNL_PSELECD 0x10 /* direct input, active high */
79 #define PNL_PERRORP 0x08 /* direct input, active low */
80
81 #define PNL_PBIDIR 0x20 /* bi-directional ports */
82 /* high to read data in or-ed with data out */
83 #define PNL_PINTEN 0x10
84 #define PNL_PSELECP 0x08 /* inverted output, active low */
85 #define PNL_PINITP 0x04 /* direct output, active low */
86 #define PNL_PAUTOLF 0x02 /* inverted output, active low */
87 #define PNL_PSTROBE 0x01 /* inverted output */
88
89 #define PNL_PD0 0x01
90 #define PNL_PD1 0x02
91 #define PNL_PD2 0x04
92 #define PNL_PD3 0x08
93 #define PNL_PD4 0x10
94 #define PNL_PD5 0x20
95 #define PNL_PD6 0x40
96 #define PNL_PD7 0x80
97
98 #define PIN_NONE 0
99 #define PIN_STROBE 1
100 #define PIN_D0 2
101 #define PIN_D1 3
102 #define PIN_D2 4
103 #define PIN_D3 5
104 #define PIN_D4 6
105 #define PIN_D5 7
106 #define PIN_D6 8
107 #define PIN_D7 9
108 #define PIN_AUTOLF 14
109 #define PIN_INITP 16
110 #define PIN_SELECP 17
111 #define PIN_NOT_SET 127
112
113 #define NOT_SET -1
114
115 /* macros to simplify use of the parallel port */
116 #define r_ctr(x) (parport_read_control((x)->port))
117 #define r_dtr(x) (parport_read_data((x)->port))
118 #define r_str(x) (parport_read_status((x)->port))
119 #define w_ctr(x, y) (parport_write_control((x)->port, (y)))
120 #define w_dtr(x, y) (parport_write_data((x)->port, (y)))
121
122 /* this defines which bits are to be used and which ones to be ignored */
123 /* logical or of the output bits involved in the scan matrix */
124 static __u8 scan_mask_o;
125 /* logical or of the input bits involved in the scan matrix */
126 static __u8 scan_mask_i;
127
128 enum input_type {
129 INPUT_TYPE_STD,
130 INPUT_TYPE_KBD,
131 };
132
133 enum input_state {
134 INPUT_ST_LOW,
135 INPUT_ST_RISING,
136 INPUT_ST_HIGH,
137 INPUT_ST_FALLING,
138 };
139
140 struct logical_input {
141 struct list_head list;
142 __u64 mask;
143 __u64 value;
144 enum input_type type;
145 enum input_state state;
146 __u8 rise_time, fall_time;
147 __u8 rise_timer, fall_timer, high_timer;
148
149 union {
150 struct { /* valid when type == INPUT_TYPE_STD */
151 void (*press_fct)(int);
152 void (*release_fct)(int);
153 int press_data;
154 int release_data;
155 } std;
156 struct { /* valid when type == INPUT_TYPE_KBD */
157 char press_str[sizeof(void *) + sizeof(int)] __nonstring;
158 char repeat_str[sizeof(void *) + sizeof(int)] __nonstring;
159 char release_str[sizeof(void *) + sizeof(int)] __nonstring;
160 } kbd;
161 } u;
162 };
163
164 static LIST_HEAD(logical_inputs); /* list of all defined logical inputs */
165
166 /* physical contacts history
167 * Physical contacts are a 45 bits string of 9 groups of 5 bits each.
168 * The 8 lower groups correspond to output bits 0 to 7, and the 9th group
169 * corresponds to the ground.
170 * Within each group, bits are stored in the same order as read on the port :
171 * BAPSE (busy=4, ack=3, paper empty=2, select=1, error=0).
172 * So, each __u64 is represented like this :
173 * 0000000000000000000BAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSE
174 * <-----unused------><gnd><d07><d06><d05><d04><d03><d02><d01><d00>
175 */
176
177 /* what has just been read from the I/O ports */
178 static __u64 phys_read;
179 /* previous phys_read */
180 static __u64 phys_read_prev;
181 /* stabilized phys_read (phys_read|phys_read_prev) */
182 static __u64 phys_curr;
183 /* previous phys_curr */
184 static __u64 phys_prev;
185 /* 0 means that at least one logical signal needs be computed */
186 static char inputs_stable;
187
188 /* these variables are specific to the keypad */
189 static struct {
190 bool enabled;
191 } keypad;
192
193 static char keypad_buffer[KEYPAD_BUFFER];
194 static int keypad_buflen;
195 static int keypad_start;
196 static char keypressed;
197 static wait_queue_head_t keypad_read_wait;
198
199 /* lcd-specific variables */
200 static struct {
201 bool enabled;
202 bool initialized;
203
204 int charset;
205 int proto;
206
207 /* TODO: use union here? */
208 struct {
209 int e;
210 int rs;
211 int rw;
212 int cl;
213 int da;
214 int bl;
215 } pins;
216
217 struct charlcd *charlcd;
218 } lcd;
219
220 /* Needed only for init */
221 static int selected_lcd_type = NOT_SET;
222
223 /*
224 * Bit masks to convert LCD signals to parallel port outputs.
225 * _d_ are values for data port, _c_ are for control port.
226 * [0] = signal OFF, [1] = signal ON, [2] = mask
227 */
228 #define BIT_CLR 0
229 #define BIT_SET 1
230 #define BIT_MSK 2
231 #define BIT_STATES 3
232 /*
233 * one entry for each bit on the LCD
234 */
235 #define LCD_BIT_E 0
236 #define LCD_BIT_RS 1
237 #define LCD_BIT_RW 2
238 #define LCD_BIT_BL 3
239 #define LCD_BIT_CL 4
240 #define LCD_BIT_DA 5
241 #define LCD_BITS 6
242
243 /*
244 * each bit can be either connected to a DATA or CTRL port
245 */
246 #define LCD_PORT_C 0
247 #define LCD_PORT_D 1
248 #define LCD_PORTS 2
249
250 static unsigned char lcd_bits[LCD_PORTS][LCD_BITS][BIT_STATES];
251
252 /*
253 * LCD protocols
254 */
255 #define LCD_PROTO_PARALLEL 0
256 #define LCD_PROTO_SERIAL 1
257 #define LCD_PROTO_TI_DA8XX_LCD 2
258
259 /*
260 * LCD character sets
261 */
262 #define LCD_CHARSET_NORMAL 0
263 #define LCD_CHARSET_KS0074 1
264
265 /*
266 * LCD types
267 */
268 #define LCD_TYPE_NONE 0
269 #define LCD_TYPE_CUSTOM 1
270 #define LCD_TYPE_OLD 2
271 #define LCD_TYPE_KS0074 3
272 #define LCD_TYPE_HANTRONIX 4
273 #define LCD_TYPE_NEXCOM 5
274
275 /*
276 * keypad types
277 */
278 #define KEYPAD_TYPE_NONE 0
279 #define KEYPAD_TYPE_OLD 1
280 #define KEYPAD_TYPE_NEW 2
281 #define KEYPAD_TYPE_NEXCOM 3
282
283 /*
284 * panel profiles
285 */
286 #define PANEL_PROFILE_CUSTOM 0
287 #define PANEL_PROFILE_OLD 1
288 #define PANEL_PROFILE_NEW 2
289 #define PANEL_PROFILE_HANTRONIX 3
290 #define PANEL_PROFILE_NEXCOM 4
291 #define PANEL_PROFILE_LARGE 5
292
293 /*
294 * Construct custom config from the kernel's configuration
295 */
296 #define DEFAULT_PARPORT 0
297 #define DEFAULT_PROFILE PANEL_PROFILE_LARGE
298 #define DEFAULT_KEYPAD_TYPE KEYPAD_TYPE_OLD
299 #define DEFAULT_LCD_TYPE LCD_TYPE_OLD
300 #define DEFAULT_LCD_HEIGHT 2
301 #define DEFAULT_LCD_WIDTH 40
302 #define DEFAULT_LCD_CHARSET LCD_CHARSET_NORMAL
303 #define DEFAULT_LCD_PROTO LCD_PROTO_PARALLEL
304
305 #define DEFAULT_LCD_PIN_E PIN_AUTOLF
306 #define DEFAULT_LCD_PIN_RS PIN_SELECP
307 #define DEFAULT_LCD_PIN_RW PIN_INITP
308 #define DEFAULT_LCD_PIN_SCL PIN_STROBE
309 #define DEFAULT_LCD_PIN_SDA PIN_D0
310 #define DEFAULT_LCD_PIN_BL PIN_NOT_SET
311
312 #ifdef CONFIG_PANEL_PARPORT
313 #undef DEFAULT_PARPORT
314 #define DEFAULT_PARPORT CONFIG_PANEL_PARPORT
315 #endif
316
317 #ifdef CONFIG_PANEL_PROFILE
318 #undef DEFAULT_PROFILE
319 #define DEFAULT_PROFILE CONFIG_PANEL_PROFILE
320 #endif
321
322 #if DEFAULT_PROFILE == 0 /* custom */
323 #ifdef CONFIG_PANEL_KEYPAD
324 #undef DEFAULT_KEYPAD_TYPE
325 #define DEFAULT_KEYPAD_TYPE CONFIG_PANEL_KEYPAD
326 #endif
327
328 #ifdef CONFIG_PANEL_LCD
329 #undef DEFAULT_LCD_TYPE
330 #define DEFAULT_LCD_TYPE CONFIG_PANEL_LCD
331 #endif
332
333 #ifdef CONFIG_PANEL_LCD_HEIGHT
334 #undef DEFAULT_LCD_HEIGHT
335 #define DEFAULT_LCD_HEIGHT CONFIG_PANEL_LCD_HEIGHT
336 #endif
337
338 #ifdef CONFIG_PANEL_LCD_WIDTH
339 #undef DEFAULT_LCD_WIDTH
340 #define DEFAULT_LCD_WIDTH CONFIG_PANEL_LCD_WIDTH
341 #endif
342
343 #ifdef CONFIG_PANEL_LCD_BWIDTH
344 #undef DEFAULT_LCD_BWIDTH
345 #define DEFAULT_LCD_BWIDTH CONFIG_PANEL_LCD_BWIDTH
346 #endif
347
348 #ifdef CONFIG_PANEL_LCD_HWIDTH
349 #undef DEFAULT_LCD_HWIDTH
350 #define DEFAULT_LCD_HWIDTH CONFIG_PANEL_LCD_HWIDTH
351 #endif
352
353 #ifdef CONFIG_PANEL_LCD_CHARSET
354 #undef DEFAULT_LCD_CHARSET
355 #define DEFAULT_LCD_CHARSET CONFIG_PANEL_LCD_CHARSET
356 #endif
357
358 #ifdef CONFIG_PANEL_LCD_PROTO
359 #undef DEFAULT_LCD_PROTO
360 #define DEFAULT_LCD_PROTO CONFIG_PANEL_LCD_PROTO
361 #endif
362
363 #ifdef CONFIG_PANEL_LCD_PIN_E
364 #undef DEFAULT_LCD_PIN_E
365 #define DEFAULT_LCD_PIN_E CONFIG_PANEL_LCD_PIN_E
366 #endif
367
368 #ifdef CONFIG_PANEL_LCD_PIN_RS
369 #undef DEFAULT_LCD_PIN_RS
370 #define DEFAULT_LCD_PIN_RS CONFIG_PANEL_LCD_PIN_RS
371 #endif
372
373 #ifdef CONFIG_PANEL_LCD_PIN_RW
374 #undef DEFAULT_LCD_PIN_RW
375 #define DEFAULT_LCD_PIN_RW CONFIG_PANEL_LCD_PIN_RW
376 #endif
377
378 #ifdef CONFIG_PANEL_LCD_PIN_SCL
379 #undef DEFAULT_LCD_PIN_SCL
380 #define DEFAULT_LCD_PIN_SCL CONFIG_PANEL_LCD_PIN_SCL
381 #endif
382
383 #ifdef CONFIG_PANEL_LCD_PIN_SDA
384 #undef DEFAULT_LCD_PIN_SDA
385 #define DEFAULT_LCD_PIN_SDA CONFIG_PANEL_LCD_PIN_SDA
386 #endif
387
388 #ifdef CONFIG_PANEL_LCD_PIN_BL
389 #undef DEFAULT_LCD_PIN_BL
390 #define DEFAULT_LCD_PIN_BL CONFIG_PANEL_LCD_PIN_BL
391 #endif
392
393 #endif /* DEFAULT_PROFILE == 0 */
394
395 /* global variables */
396
397 /* Device single-open policy control */
398 static atomic_t keypad_available = ATOMIC_INIT(1);
399
400 static struct pardevice *pprt;
401
402 static int keypad_initialized;
403
404 static DEFINE_SPINLOCK(pprt_lock);
405 static struct timer_list scan_timer;
406
407 MODULE_DESCRIPTION("Generic parallel port LCD/Keypad driver");
408
409 static int parport = DEFAULT_PARPORT;
410 module_param(parport, int, 0000);
411 MODULE_PARM_DESC(parport, "Parallel port index (0=lpt1, 1=lpt2, ...)");
412
413 static int profile = DEFAULT_PROFILE;
414 module_param(profile, int, 0000);
415 MODULE_PARM_DESC(profile,
416 "1=16x2 old kp; 2=serial 16x2, new kp; 3=16x2 hantronix; "
417 "4=16x2 nexcom; default=40x2, old kp");
418
419 static int keypad_type = NOT_SET;
420 module_param(keypad_type, int, 0000);
421 MODULE_PARM_DESC(keypad_type,
422 "Keypad type: 0=none, 1=old 6 keys, 2=new 6+1 keys, 3=nexcom 4 keys");
423
424 static int lcd_type = NOT_SET;
425 module_param(lcd_type, int, 0000);
426 MODULE_PARM_DESC(lcd_type,
427 "LCD type: 0=none, 1=compiled-in, 2=old, 3=serial ks0074, 4=hantronix, 5=nexcom");
428
429 static int lcd_height = NOT_SET;
430 module_param(lcd_height, int, 0000);
431 MODULE_PARM_DESC(lcd_height, "Number of lines on the LCD");
432
433 static int lcd_width = NOT_SET;
434 module_param(lcd_width, int, 0000);
435 MODULE_PARM_DESC(lcd_width, "Number of columns on the LCD");
436
437 static int lcd_bwidth = NOT_SET; /* internal buffer width (usually 40) */
438 module_param(lcd_bwidth, int, 0000);
439 MODULE_PARM_DESC(lcd_bwidth, "Internal LCD line width (40)");
440
441 static int lcd_hwidth = NOT_SET; /* hardware buffer width (usually 64) */
442 module_param(lcd_hwidth, int, 0000);
443 MODULE_PARM_DESC(lcd_hwidth, "LCD line hardware address (64)");
444
445 static int lcd_charset = NOT_SET;
446 module_param(lcd_charset, int, 0000);
447 MODULE_PARM_DESC(lcd_charset, "LCD character set: 0=standard, 1=KS0074");
448
449 static int lcd_proto = NOT_SET;
450 module_param(lcd_proto, int, 0000);
451 MODULE_PARM_DESC(lcd_proto,
452 "LCD communication: 0=parallel (//), 1=serial, 2=TI LCD Interface");
453
454 /*
455 * These are the parallel port pins the LCD control signals are connected to.
456 * Set this to 0 if the signal is not used. Set it to its opposite value
457 * (negative) if the signal is negated. -MAXINT is used to indicate that the
458 * pin has not been explicitly specified.
459 *
460 * WARNING! no check will be performed about collisions with keypad !
461 */
462
463 static int lcd_e_pin = PIN_NOT_SET;
464 module_param(lcd_e_pin, int, 0000);
465 MODULE_PARM_DESC(lcd_e_pin,
466 "# of the // port pin connected to LCD 'E' signal, with polarity (-17..17)");
467
468 static int lcd_rs_pin = PIN_NOT_SET;
469 module_param(lcd_rs_pin, int, 0000);
470 MODULE_PARM_DESC(lcd_rs_pin,
471 "# of the // port pin connected to LCD 'RS' signal, with polarity (-17..17)");
472
473 static int lcd_rw_pin = PIN_NOT_SET;
474 module_param(lcd_rw_pin, int, 0000);
475 MODULE_PARM_DESC(lcd_rw_pin,
476 "# of the // port pin connected to LCD 'RW' signal, with polarity (-17..17)");
477
478 static int lcd_cl_pin = PIN_NOT_SET;
479 module_param(lcd_cl_pin, int, 0000);
480 MODULE_PARM_DESC(lcd_cl_pin,
481 "# of the // port pin connected to serial LCD 'SCL' signal, with polarity (-17..17)");
482
483 static int lcd_da_pin = PIN_NOT_SET;
484 module_param(lcd_da_pin, int, 0000);
485 MODULE_PARM_DESC(lcd_da_pin,
486 "# of the // port pin connected to serial LCD 'SDA' signal, with polarity (-17..17)");
487
488 static int lcd_bl_pin = PIN_NOT_SET;
489 module_param(lcd_bl_pin, int, 0000);
490 MODULE_PARM_DESC(lcd_bl_pin,
491 "# of the // port pin connected to LCD backlight, with polarity (-17..17)");
492
493 /* Deprecated module parameters - consider not using them anymore */
494
495 static int lcd_enabled = NOT_SET;
496 module_param(lcd_enabled, int, 0000);
497 MODULE_PARM_DESC(lcd_enabled, "Deprecated option, use lcd_type instead");
498
499 static int keypad_enabled = NOT_SET;
500 module_param(keypad_enabled, int, 0000);
501 MODULE_PARM_DESC(keypad_enabled, "Deprecated option, use keypad_type instead");
502
503 /* for some LCD drivers (ks0074) we need a charset conversion table. */
504 static const unsigned char lcd_char_conv_ks0074[256] = {
505 /* 0|8 1|9 2|A 3|B 4|C 5|D 6|E 7|F */
506 /* 0x00 */ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
507 /* 0x08 */ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
508 /* 0x10 */ 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
509 /* 0x18 */ 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
510 /* 0x20 */ 0x20, 0x21, 0x22, 0x23, 0xa2, 0x25, 0x26, 0x27,
511 /* 0x28 */ 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
512 /* 0x30 */ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
513 /* 0x38 */ 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
514 /* 0x40 */ 0xa0, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
515 /* 0x48 */ 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
516 /* 0x50 */ 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
517 /* 0x58 */ 0x58, 0x59, 0x5a, 0xfa, 0xfb, 0xfc, 0x1d, 0xc4,
518 /* 0x60 */ 0x96, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
519 /* 0x68 */ 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
520 /* 0x70 */ 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
521 /* 0x78 */ 0x78, 0x79, 0x7a, 0xfd, 0xfe, 0xff, 0xce, 0x20,
522 /* 0x80 */ 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
523 /* 0x88 */ 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
524 /* 0x90 */ 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
525 /* 0x98 */ 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
526 /* 0xA0 */ 0x20, 0x40, 0xb1, 0xa1, 0x24, 0xa3, 0xfe, 0x5f,
527 /* 0xA8 */ 0x22, 0xc8, 0x61, 0x14, 0x97, 0x2d, 0xad, 0x96,
528 /* 0xB0 */ 0x80, 0x8c, 0x82, 0x83, 0x27, 0x8f, 0x86, 0xdd,
529 /* 0xB8 */ 0x2c, 0x81, 0x6f, 0x15, 0x8b, 0x8a, 0x84, 0x60,
530 /* 0xC0 */ 0xe2, 0xe2, 0xe2, 0x5b, 0x5b, 0xae, 0xbc, 0xa9,
531 /* 0xC8 */ 0xc5, 0xbf, 0xc6, 0xf1, 0xe3, 0xe3, 0xe3, 0xe3,
532 /* 0xD0 */ 0x44, 0x5d, 0xa8, 0xe4, 0xec, 0xec, 0x5c, 0x78,
533 /* 0xD8 */ 0xab, 0xa6, 0xe5, 0x5e, 0x5e, 0xe6, 0xaa, 0xbe,
534 /* 0xE0 */ 0x7f, 0xe7, 0xaf, 0x7b, 0x7b, 0xaf, 0xbd, 0xc8,
535 /* 0xE8 */ 0xa4, 0xa5, 0xc7, 0xf6, 0xa7, 0xe8, 0x69, 0x69,
536 /* 0xF0 */ 0xed, 0x7d, 0xa8, 0xe4, 0xec, 0x5c, 0x5c, 0x25,
537 /* 0xF8 */ 0xac, 0xa6, 0xea, 0xef, 0x7e, 0xeb, 0xb2, 0x79,
538 };
539
540 static const char old_keypad_profile[][4][9] = {
541 {"S0", "Left\n", "Left\n", ""},
542 {"S1", "Down\n", "Down\n", ""},
543 {"S2", "Up\n", "Up\n", ""},
544 {"S3", "Right\n", "Right\n", ""},
545 {"S4", "Esc\n", "Esc\n", ""},
546 {"S5", "Ret\n", "Ret\n", ""},
547 {"", "", "", ""}
548 };
549
550 /* signals, press, repeat, release */
551 static const char new_keypad_profile[][4][9] = {
552 {"S0", "Left\n", "Left\n", ""},
553 {"S1", "Down\n", "Down\n", ""},
554 {"S2", "Up\n", "Up\n", ""},
555 {"S3", "Right\n", "Right\n", ""},
556 {"S4s5", "", "Esc\n", "Esc\n"},
557 {"s4S5", "", "Ret\n", "Ret\n"},
558 {"S4S5", "Help\n", "", ""},
559 /* add new signals above this line */
560 {"", "", "", ""}
561 };
562
563 /* signals, press, repeat, release */
564 static const char nexcom_keypad_profile[][4][9] = {
565 {"a-p-e-", "Down\n", "Down\n", ""},
566 {"a-p-E-", "Ret\n", "Ret\n", ""},
567 {"a-P-E-", "Esc\n", "Esc\n", ""},
568 {"a-P-e-", "Up\n", "Up\n", ""},
569 /* add new signals above this line */
570 {"", "", "", ""}
571 };
572
573 static const char (*keypad_profile)[4][9] = old_keypad_profile;
574
575 static DECLARE_BITMAP(bits, LCD_BITS);
576
lcd_get_bits(unsigned int port,int * val)577 static void lcd_get_bits(unsigned int port, int *val)
578 {
579 unsigned int bit, state;
580
581 for (bit = 0; bit < LCD_BITS; bit++) {
582 state = test_bit(bit, bits) ? BIT_SET : BIT_CLR;
583 *val &= lcd_bits[port][bit][BIT_MSK];
584 *val |= lcd_bits[port][bit][state];
585 }
586 }
587
588 /* sets data port bits according to current signals values */
set_data_bits(void)589 static int set_data_bits(void)
590 {
591 int val;
592
593 val = r_dtr(pprt);
594 lcd_get_bits(LCD_PORT_D, &val);
595 w_dtr(pprt, val);
596 return val;
597 }
598
599 /* sets ctrl port bits according to current signals values */
set_ctrl_bits(void)600 static int set_ctrl_bits(void)
601 {
602 int val;
603
604 val = r_ctr(pprt);
605 lcd_get_bits(LCD_PORT_C, &val);
606 w_ctr(pprt, val);
607 return val;
608 }
609
610 /* sets ctrl & data port bits according to current signals values */
panel_set_bits(void)611 static void panel_set_bits(void)
612 {
613 set_data_bits();
614 set_ctrl_bits();
615 }
616
617 /*
618 * Converts a parallel port pin (from -25 to 25) to data and control ports
619 * masks, and data and control port bits. The signal will be considered
620 * unconnected if it's on pin 0 or an invalid pin (<-25 or >25).
621 *
622 * Result will be used this way :
623 * out(dport, in(dport) & d_val[2] | d_val[signal_state])
624 * out(cport, in(cport) & c_val[2] | c_val[signal_state])
625 */
pin_to_bits(int pin,unsigned char * d_val,unsigned char * c_val)626 static void pin_to_bits(int pin, unsigned char *d_val, unsigned char *c_val)
627 {
628 int d_bit, c_bit, inv;
629
630 d_val[0] = 0;
631 c_val[0] = 0;
632 d_val[1] = 0;
633 c_val[1] = 0;
634 d_val[2] = 0xFF;
635 c_val[2] = 0xFF;
636
637 if (pin == 0)
638 return;
639
640 inv = (pin < 0);
641 if (inv)
642 pin = -pin;
643
644 d_bit = 0;
645 c_bit = 0;
646
647 switch (pin) {
648 case PIN_STROBE: /* strobe, inverted */
649 c_bit = PNL_PSTROBE;
650 inv = !inv;
651 break;
652 case PIN_D0...PIN_D7: /* D0 - D7 = 2 - 9 */
653 d_bit = 1 << (pin - 2);
654 break;
655 case PIN_AUTOLF: /* autofeed, inverted */
656 c_bit = PNL_PAUTOLF;
657 inv = !inv;
658 break;
659 case PIN_INITP: /* init, direct */
660 c_bit = PNL_PINITP;
661 break;
662 case PIN_SELECP: /* select_in, inverted */
663 c_bit = PNL_PSELECP;
664 inv = !inv;
665 break;
666 default: /* unknown pin, ignore */
667 break;
668 }
669
670 if (c_bit) {
671 c_val[2] &= ~c_bit;
672 c_val[!inv] = c_bit;
673 } else if (d_bit) {
674 d_val[2] &= ~d_bit;
675 d_val[!inv] = d_bit;
676 }
677 }
678
679 /*
680 * send a serial byte to the LCD panel. The caller is responsible for locking
681 * if needed.
682 */
lcd_send_serial(int byte)683 static void lcd_send_serial(int byte)
684 {
685 int bit;
686
687 /*
688 * the data bit is set on D0, and the clock on STROBE.
689 * LCD reads D0 on STROBE's rising edge.
690 */
691 for (bit = 0; bit < 8; bit++) {
692 clear_bit(LCD_BIT_CL, bits); /* CLK low */
693 panel_set_bits();
694 if (byte & 1) {
695 set_bit(LCD_BIT_DA, bits);
696 } else {
697 clear_bit(LCD_BIT_DA, bits);
698 }
699
700 panel_set_bits();
701 udelay(2); /* maintain the data during 2 us before CLK up */
702 set_bit(LCD_BIT_CL, bits); /* CLK high */
703 panel_set_bits();
704 udelay(1); /* maintain the strobe during 1 us */
705 byte >>= 1;
706 }
707 }
708
709 /* turn the backlight on or off */
lcd_backlight(struct charlcd * charlcd,enum charlcd_onoff on)710 static void lcd_backlight(struct charlcd *charlcd, enum charlcd_onoff on)
711 {
712 if (lcd.pins.bl == PIN_NONE)
713 return;
714
715 /* The backlight is activated by setting the AUTOFEED line to +5V */
716 spin_lock_irq(&pprt_lock);
717 if (on)
718 set_bit(LCD_BIT_BL, bits);
719 else
720 clear_bit(LCD_BIT_BL, bits);
721 panel_set_bits();
722 spin_unlock_irq(&pprt_lock);
723 }
724
725 /* send a command to the LCD panel in serial mode */
lcd_write_cmd_s(struct hd44780_common * hdc,int cmd)726 static void lcd_write_cmd_s(struct hd44780_common *hdc, int cmd)
727 {
728 spin_lock_irq(&pprt_lock);
729 lcd_send_serial(0x1F); /* R/W=W, RS=0 */
730 lcd_send_serial(cmd & 0x0F);
731 lcd_send_serial((cmd >> 4) & 0x0F);
732 udelay(40); /* the shortest command takes at least 40 us */
733 spin_unlock_irq(&pprt_lock);
734 }
735
736 /* send data to the LCD panel in serial mode */
lcd_write_data_s(struct hd44780_common * hdc,int data)737 static void lcd_write_data_s(struct hd44780_common *hdc, int data)
738 {
739 spin_lock_irq(&pprt_lock);
740 lcd_send_serial(0x5F); /* R/W=W, RS=1 */
741 lcd_send_serial(data & 0x0F);
742 lcd_send_serial((data >> 4) & 0x0F);
743 udelay(40); /* the shortest data takes at least 40 us */
744 spin_unlock_irq(&pprt_lock);
745 }
746
747 /* send a command to the LCD panel in 8 bits parallel mode */
lcd_write_cmd_p8(struct hd44780_common * hdc,int cmd)748 static void lcd_write_cmd_p8(struct hd44780_common *hdc, int cmd)
749 {
750 spin_lock_irq(&pprt_lock);
751 /* present the data to the data port */
752 w_dtr(pprt, cmd);
753 udelay(20); /* maintain the data during 20 us before the strobe */
754
755 set_bit(LCD_BIT_E, bits);
756 clear_bit(LCD_BIT_RS, bits);
757 clear_bit(LCD_BIT_RW, bits);
758 set_ctrl_bits();
759
760 udelay(40); /* maintain the strobe during 40 us */
761
762 clear_bit(LCD_BIT_E, bits);
763 set_ctrl_bits();
764
765 udelay(120); /* the shortest command takes at least 120 us */
766 spin_unlock_irq(&pprt_lock);
767 }
768
769 /* send data to the LCD panel in 8 bits parallel mode */
lcd_write_data_p8(struct hd44780_common * hdc,int data)770 static void lcd_write_data_p8(struct hd44780_common *hdc, int data)
771 {
772 spin_lock_irq(&pprt_lock);
773 /* present the data to the data port */
774 w_dtr(pprt, data);
775 udelay(20); /* maintain the data during 20 us before the strobe */
776
777 set_bit(LCD_BIT_E, bits);
778 set_bit(LCD_BIT_RS, bits);
779 clear_bit(LCD_BIT_RW, bits);
780 set_ctrl_bits();
781
782 udelay(40); /* maintain the strobe during 40 us */
783
784 clear_bit(LCD_BIT_E, bits);
785 set_ctrl_bits();
786
787 udelay(45); /* the shortest data takes at least 45 us */
788 spin_unlock_irq(&pprt_lock);
789 }
790
791 /* send a command to the TI LCD panel */
lcd_write_cmd_tilcd(struct hd44780_common * hdc,int cmd)792 static void lcd_write_cmd_tilcd(struct hd44780_common *hdc, int cmd)
793 {
794 spin_lock_irq(&pprt_lock);
795 /* present the data to the control port */
796 w_ctr(pprt, cmd);
797 udelay(60);
798 spin_unlock_irq(&pprt_lock);
799 }
800
801 /* send data to the TI LCD panel */
lcd_write_data_tilcd(struct hd44780_common * hdc,int data)802 static void lcd_write_data_tilcd(struct hd44780_common *hdc, int data)
803 {
804 spin_lock_irq(&pprt_lock);
805 /* present the data to the data port */
806 w_dtr(pprt, data);
807 udelay(60);
808 spin_unlock_irq(&pprt_lock);
809 }
810
811 static const struct charlcd_ops charlcd_ops = {
812 .backlight = lcd_backlight,
813 .print = hd44780_common_print,
814 .gotoxy = hd44780_common_gotoxy,
815 .home = hd44780_common_home,
816 .clear_display = hd44780_common_clear_display,
817 .init_display = hd44780_common_init_display,
818 .shift_cursor = hd44780_common_shift_cursor,
819 .shift_display = hd44780_common_shift_display,
820 .display = hd44780_common_display,
821 .cursor = hd44780_common_cursor,
822 .blink = hd44780_common_blink,
823 .fontsize = hd44780_common_fontsize,
824 .lines = hd44780_common_lines,
825 .redefine_char = hd44780_common_redefine_char,
826 };
827
828 /* initialize the LCD driver */
lcd_init(void)829 static void lcd_init(void)
830 {
831 struct charlcd *charlcd;
832 struct hd44780_common *hdc;
833
834 hdc = hd44780_common_alloc();
835 if (!hdc)
836 return;
837
838 charlcd = charlcd_alloc();
839 if (!charlcd) {
840 kfree(hdc);
841 return;
842 }
843
844 hdc->hd44780 = &lcd;
845 charlcd->drvdata = hdc;
846
847 /*
848 * Init lcd struct with load-time values to preserve exact
849 * current functionality (at least for now).
850 */
851 charlcd->height = lcd_height;
852 charlcd->width = lcd_width;
853 hdc->bwidth = lcd_bwidth;
854 hdc->hwidth = lcd_hwidth;
855
856 switch (selected_lcd_type) {
857 case LCD_TYPE_OLD:
858 /* parallel mode, 8 bits */
859 lcd.proto = LCD_PROTO_PARALLEL;
860 lcd.charset = LCD_CHARSET_NORMAL;
861 lcd.pins.e = PIN_STROBE;
862 lcd.pins.rs = PIN_AUTOLF;
863
864 charlcd->width = 40;
865 hdc->bwidth = 40;
866 hdc->hwidth = 64;
867 charlcd->height = 2;
868 break;
869 case LCD_TYPE_KS0074:
870 /* serial mode, ks0074 */
871 lcd.proto = LCD_PROTO_SERIAL;
872 lcd.charset = LCD_CHARSET_KS0074;
873 lcd.pins.bl = PIN_AUTOLF;
874 lcd.pins.cl = PIN_STROBE;
875 lcd.pins.da = PIN_D0;
876
877 charlcd->width = 16;
878 hdc->bwidth = 40;
879 hdc->hwidth = 16;
880 charlcd->height = 2;
881 break;
882 case LCD_TYPE_NEXCOM:
883 /* parallel mode, 8 bits, generic */
884 lcd.proto = LCD_PROTO_PARALLEL;
885 lcd.charset = LCD_CHARSET_NORMAL;
886 lcd.pins.e = PIN_AUTOLF;
887 lcd.pins.rs = PIN_SELECP;
888 lcd.pins.rw = PIN_INITP;
889
890 charlcd->width = 16;
891 hdc->bwidth = 40;
892 hdc->hwidth = 64;
893 charlcd->height = 2;
894 break;
895 case LCD_TYPE_CUSTOM:
896 /* customer-defined */
897 lcd.proto = DEFAULT_LCD_PROTO;
898 lcd.charset = DEFAULT_LCD_CHARSET;
899 /* default geometry will be set later */
900 break;
901 case LCD_TYPE_HANTRONIX:
902 /* parallel mode, 8 bits, hantronix-like */
903 default:
904 lcd.proto = LCD_PROTO_PARALLEL;
905 lcd.charset = LCD_CHARSET_NORMAL;
906 lcd.pins.e = PIN_STROBE;
907 lcd.pins.rs = PIN_SELECP;
908
909 charlcd->width = 16;
910 hdc->bwidth = 40;
911 hdc->hwidth = 64;
912 charlcd->height = 2;
913 break;
914 }
915
916 /* Overwrite with module params set on loading */
917 if (lcd_height != NOT_SET)
918 charlcd->height = lcd_height;
919 if (lcd_width != NOT_SET)
920 charlcd->width = lcd_width;
921 if (lcd_bwidth != NOT_SET)
922 hdc->bwidth = lcd_bwidth;
923 if (lcd_hwidth != NOT_SET)
924 hdc->hwidth = lcd_hwidth;
925 if (lcd_charset != NOT_SET)
926 lcd.charset = lcd_charset;
927 if (lcd_proto != NOT_SET)
928 lcd.proto = lcd_proto;
929 if (lcd_e_pin != PIN_NOT_SET)
930 lcd.pins.e = lcd_e_pin;
931 if (lcd_rs_pin != PIN_NOT_SET)
932 lcd.pins.rs = lcd_rs_pin;
933 if (lcd_rw_pin != PIN_NOT_SET)
934 lcd.pins.rw = lcd_rw_pin;
935 if (lcd_cl_pin != PIN_NOT_SET)
936 lcd.pins.cl = lcd_cl_pin;
937 if (lcd_da_pin != PIN_NOT_SET)
938 lcd.pins.da = lcd_da_pin;
939 if (lcd_bl_pin != PIN_NOT_SET)
940 lcd.pins.bl = lcd_bl_pin;
941
942 /* this is used to catch wrong and default values */
943 if (charlcd->width <= 0)
944 charlcd->width = DEFAULT_LCD_WIDTH;
945 if (hdc->bwidth <= 0)
946 hdc->bwidth = DEFAULT_LCD_BWIDTH;
947 if (hdc->hwidth <= 0)
948 hdc->hwidth = DEFAULT_LCD_HWIDTH;
949 if (charlcd->height <= 0)
950 charlcd->height = DEFAULT_LCD_HEIGHT;
951
952 if (lcd.proto == LCD_PROTO_SERIAL) { /* SERIAL */
953 charlcd->ops = &charlcd_ops;
954 hdc->write_data = lcd_write_data_s;
955 hdc->write_cmd = lcd_write_cmd_s;
956
957 if (lcd.pins.cl == PIN_NOT_SET)
958 lcd.pins.cl = DEFAULT_LCD_PIN_SCL;
959 if (lcd.pins.da == PIN_NOT_SET)
960 lcd.pins.da = DEFAULT_LCD_PIN_SDA;
961
962 } else if (lcd.proto == LCD_PROTO_PARALLEL) { /* PARALLEL */
963 charlcd->ops = &charlcd_ops;
964 hdc->write_data = lcd_write_data_p8;
965 hdc->write_cmd = lcd_write_cmd_p8;
966
967 if (lcd.pins.e == PIN_NOT_SET)
968 lcd.pins.e = DEFAULT_LCD_PIN_E;
969 if (lcd.pins.rs == PIN_NOT_SET)
970 lcd.pins.rs = DEFAULT_LCD_PIN_RS;
971 if (lcd.pins.rw == PIN_NOT_SET)
972 lcd.pins.rw = DEFAULT_LCD_PIN_RW;
973 } else {
974 charlcd->ops = &charlcd_ops;
975 hdc->write_data = lcd_write_data_tilcd;
976 hdc->write_cmd = lcd_write_cmd_tilcd;
977 }
978
979 if (lcd.pins.bl == PIN_NOT_SET)
980 lcd.pins.bl = DEFAULT_LCD_PIN_BL;
981
982 if (lcd.pins.e == PIN_NOT_SET)
983 lcd.pins.e = PIN_NONE;
984 if (lcd.pins.rs == PIN_NOT_SET)
985 lcd.pins.rs = PIN_NONE;
986 if (lcd.pins.rw == PIN_NOT_SET)
987 lcd.pins.rw = PIN_NONE;
988 if (lcd.pins.bl == PIN_NOT_SET)
989 lcd.pins.bl = PIN_NONE;
990 if (lcd.pins.cl == PIN_NOT_SET)
991 lcd.pins.cl = PIN_NONE;
992 if (lcd.pins.da == PIN_NOT_SET)
993 lcd.pins.da = PIN_NONE;
994
995 if (lcd.charset == NOT_SET)
996 lcd.charset = DEFAULT_LCD_CHARSET;
997
998 if (lcd.charset == LCD_CHARSET_KS0074)
999 charlcd->char_conv = lcd_char_conv_ks0074;
1000 else
1001 charlcd->char_conv = NULL;
1002
1003 pin_to_bits(lcd.pins.e, lcd_bits[LCD_PORT_D][LCD_BIT_E],
1004 lcd_bits[LCD_PORT_C][LCD_BIT_E]);
1005 pin_to_bits(lcd.pins.rs, lcd_bits[LCD_PORT_D][LCD_BIT_RS],
1006 lcd_bits[LCD_PORT_C][LCD_BIT_RS]);
1007 pin_to_bits(lcd.pins.rw, lcd_bits[LCD_PORT_D][LCD_BIT_RW],
1008 lcd_bits[LCD_PORT_C][LCD_BIT_RW]);
1009 pin_to_bits(lcd.pins.bl, lcd_bits[LCD_PORT_D][LCD_BIT_BL],
1010 lcd_bits[LCD_PORT_C][LCD_BIT_BL]);
1011 pin_to_bits(lcd.pins.cl, lcd_bits[LCD_PORT_D][LCD_BIT_CL],
1012 lcd_bits[LCD_PORT_C][LCD_BIT_CL]);
1013 pin_to_bits(lcd.pins.da, lcd_bits[LCD_PORT_D][LCD_BIT_DA],
1014 lcd_bits[LCD_PORT_C][LCD_BIT_DA]);
1015
1016 lcd.charlcd = charlcd;
1017 lcd.initialized = true;
1018 }
1019
1020 /*
1021 * These are the file operation function for user access to /dev/keypad
1022 */
1023
keypad_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)1024 static ssize_t keypad_read(struct file *file,
1025 char __user *buf, size_t count, loff_t *ppos)
1026 {
1027 unsigned i = *ppos;
1028 char __user *tmp = buf;
1029
1030 if (keypad_buflen == 0) {
1031 if (file->f_flags & O_NONBLOCK)
1032 return -EAGAIN;
1033
1034 if (wait_event_interruptible(keypad_read_wait,
1035 keypad_buflen != 0))
1036 return -EINTR;
1037 }
1038
1039 for (; count-- > 0 && (keypad_buflen > 0);
1040 ++i, ++tmp, --keypad_buflen) {
1041 put_user(keypad_buffer[keypad_start], tmp);
1042 keypad_start = (keypad_start + 1) % KEYPAD_BUFFER;
1043 }
1044 *ppos = i;
1045
1046 return tmp - buf;
1047 }
1048
keypad_open(struct inode * inode,struct file * file)1049 static int keypad_open(struct inode *inode, struct file *file)
1050 {
1051 int ret;
1052
1053 ret = -EBUSY;
1054 if (!atomic_dec_and_test(&keypad_available))
1055 goto fail; /* open only once at a time */
1056
1057 ret = -EPERM;
1058 if (file->f_mode & FMODE_WRITE) /* device is read-only */
1059 goto fail;
1060
1061 keypad_buflen = 0; /* flush the buffer on opening */
1062 return 0;
1063 fail:
1064 atomic_inc(&keypad_available);
1065 return ret;
1066 }
1067
keypad_release(struct inode * inode,struct file * file)1068 static int keypad_release(struct inode *inode, struct file *file)
1069 {
1070 atomic_inc(&keypad_available);
1071 return 0;
1072 }
1073
1074 static const struct file_operations keypad_fops = {
1075 .read = keypad_read, /* read */
1076 .open = keypad_open, /* open */
1077 .release = keypad_release, /* close */
1078 .llseek = default_llseek,
1079 };
1080
1081 static struct miscdevice keypad_dev = {
1082 .minor = KEYPAD_MINOR,
1083 .name = "keypad",
1084 .fops = &keypad_fops,
1085 };
1086
keypad_send_key(const char * string,int max_len)1087 static void keypad_send_key(const char *string, int max_len)
1088 {
1089 /* send the key to the device only if a process is attached to it. */
1090 if (!atomic_read(&keypad_available)) {
1091 while (max_len-- && keypad_buflen < KEYPAD_BUFFER && *string) {
1092 keypad_buffer[(keypad_start + keypad_buflen++) %
1093 KEYPAD_BUFFER] = *string++;
1094 }
1095 wake_up_interruptible(&keypad_read_wait);
1096 }
1097 }
1098
1099 /* this function scans all the bits involving at least one logical signal,
1100 * and puts the results in the bitfield "phys_read" (one bit per established
1101 * contact), and sets "phys_read_prev" to "phys_read".
1102 *
1103 * Note: to debounce input signals, we will only consider as switched a signal
1104 * which is stable across 2 measures. Signals which are different between two
1105 * reads will be kept as they previously were in their logical form (phys_prev).
1106 * A signal which has just switched will have a 1 in
1107 * (phys_read ^ phys_read_prev).
1108 */
phys_scan_contacts(void)1109 static void phys_scan_contacts(void)
1110 {
1111 int bit, bitval;
1112 char oldval;
1113 char bitmask;
1114 char gndmask;
1115
1116 phys_prev = phys_curr;
1117 phys_read_prev = phys_read;
1118 phys_read = 0; /* flush all signals */
1119
1120 /* keep track of old value, with all outputs disabled */
1121 oldval = r_dtr(pprt) | scan_mask_o;
1122 /* activate all keyboard outputs (active low) */
1123 w_dtr(pprt, oldval & ~scan_mask_o);
1124
1125 /* will have a 1 for each bit set to gnd */
1126 bitmask = PNL_PINPUT(r_str(pprt)) & scan_mask_i;
1127 /* disable all matrix signals */
1128 w_dtr(pprt, oldval);
1129
1130 /* now that all outputs are cleared, the only active input bits are
1131 * directly connected to the ground
1132 */
1133
1134 /* 1 for each grounded input */
1135 gndmask = PNL_PINPUT(r_str(pprt)) & scan_mask_i;
1136
1137 /* grounded inputs are signals 40-44 */
1138 phys_read |= (__u64)gndmask << 40;
1139
1140 if (bitmask != gndmask) {
1141 /*
1142 * since clearing the outputs changed some inputs, we know
1143 * that some input signals are currently tied to some outputs.
1144 * So we'll scan them.
1145 */
1146 for (bit = 0; bit < 8; bit++) {
1147 bitval = BIT(bit);
1148
1149 if (!(scan_mask_o & bitval)) /* skip unused bits */
1150 continue;
1151
1152 w_dtr(pprt, oldval & ~bitval); /* enable this output */
1153 bitmask = PNL_PINPUT(r_str(pprt)) & ~gndmask;
1154 phys_read |= (__u64)bitmask << (5 * bit);
1155 }
1156 w_dtr(pprt, oldval); /* disable all outputs */
1157 }
1158 /*
1159 * this is easy: use old bits when they are flapping,
1160 * use new ones when stable
1161 */
1162 phys_curr = (phys_prev & (phys_read ^ phys_read_prev)) |
1163 (phys_read & ~(phys_read ^ phys_read_prev));
1164 }
1165
input_state_high(struct logical_input * input)1166 static inline int input_state_high(struct logical_input *input)
1167 {
1168 #if 0
1169 /* FIXME:
1170 * this is an invalid test. It tries to catch
1171 * transitions from single-key to multiple-key, but
1172 * doesn't take into account the contacts polarity.
1173 * The only solution to the problem is to parse keys
1174 * from the most complex to the simplest combinations,
1175 * and mark them as 'caught' once a combination
1176 * matches, then unmatch it for all other ones.
1177 */
1178
1179 /* try to catch dangerous transitions cases :
1180 * someone adds a bit, so this signal was a false
1181 * positive resulting from a transition. We should
1182 * invalidate the signal immediately and not call the
1183 * release function.
1184 * eg: 0 -(press A)-> A -(press B)-> AB : don't match A's release.
1185 */
1186 if (((phys_prev & input->mask) == input->value) &&
1187 ((phys_curr & input->mask) > input->value)) {
1188 input->state = INPUT_ST_LOW; /* invalidate */
1189 return 1;
1190 }
1191 #endif
1192
1193 if ((phys_curr & input->mask) == input->value) {
1194 if ((input->type == INPUT_TYPE_STD) &&
1195 (input->high_timer == 0)) {
1196 input->high_timer++;
1197 if (input->u.std.press_fct)
1198 input->u.std.press_fct(input->u.std.press_data);
1199 } else if (input->type == INPUT_TYPE_KBD) {
1200 /* will turn on the light */
1201 keypressed = 1;
1202
1203 if (input->high_timer == 0) {
1204 char *press_str = input->u.kbd.press_str;
1205
1206 if (press_str[0]) {
1207 int s = sizeof(input->u.kbd.press_str);
1208
1209 keypad_send_key(press_str, s);
1210 }
1211 }
1212
1213 if (input->u.kbd.repeat_str[0]) {
1214 char *repeat_str = input->u.kbd.repeat_str;
1215
1216 if (input->high_timer >= KEYPAD_REP_START) {
1217 int s = sizeof(input->u.kbd.repeat_str);
1218
1219 input->high_timer -= KEYPAD_REP_DELAY;
1220 keypad_send_key(repeat_str, s);
1221 }
1222 /* we will need to come back here soon */
1223 inputs_stable = 0;
1224 }
1225
1226 if (input->high_timer < 255)
1227 input->high_timer++;
1228 }
1229 return 1;
1230 }
1231
1232 /* else signal falling down. Let's fall through. */
1233 input->state = INPUT_ST_FALLING;
1234 input->fall_timer = 0;
1235
1236 return 0;
1237 }
1238
input_state_falling(struct logical_input * input)1239 static inline void input_state_falling(struct logical_input *input)
1240 {
1241 #if 0
1242 /* FIXME !!! same comment as in input_state_high */
1243 if (((phys_prev & input->mask) == input->value) &&
1244 ((phys_curr & input->mask) > input->value)) {
1245 input->state = INPUT_ST_LOW; /* invalidate */
1246 return;
1247 }
1248 #endif
1249
1250 if ((phys_curr & input->mask) == input->value) {
1251 if (input->type == INPUT_TYPE_KBD) {
1252 /* will turn on the light */
1253 keypressed = 1;
1254
1255 if (input->u.kbd.repeat_str[0]) {
1256 char *repeat_str = input->u.kbd.repeat_str;
1257
1258 if (input->high_timer >= KEYPAD_REP_START) {
1259 int s = sizeof(input->u.kbd.repeat_str);
1260
1261 input->high_timer -= KEYPAD_REP_DELAY;
1262 keypad_send_key(repeat_str, s);
1263 }
1264 /* we will need to come back here soon */
1265 inputs_stable = 0;
1266 }
1267
1268 if (input->high_timer < 255)
1269 input->high_timer++;
1270 }
1271 input->state = INPUT_ST_HIGH;
1272 } else if (input->fall_timer >= input->fall_time) {
1273 /* call release event */
1274 if (input->type == INPUT_TYPE_STD) {
1275 void (*release_fct)(int) = input->u.std.release_fct;
1276
1277 if (release_fct)
1278 release_fct(input->u.std.release_data);
1279 } else if (input->type == INPUT_TYPE_KBD) {
1280 char *release_str = input->u.kbd.release_str;
1281
1282 if (release_str[0]) {
1283 int s = sizeof(input->u.kbd.release_str);
1284
1285 keypad_send_key(release_str, s);
1286 }
1287 }
1288
1289 input->state = INPUT_ST_LOW;
1290 } else {
1291 input->fall_timer++;
1292 inputs_stable = 0;
1293 }
1294 }
1295
panel_process_inputs(void)1296 static void panel_process_inputs(void)
1297 {
1298 struct logical_input *input;
1299
1300 keypressed = 0;
1301 inputs_stable = 1;
1302 list_for_each_entry(input, &logical_inputs, list) {
1303 switch (input->state) {
1304 case INPUT_ST_LOW:
1305 if ((phys_curr & input->mask) != input->value)
1306 break;
1307 /* if all needed ones were already set previously,
1308 * this means that this logical signal has been
1309 * activated by the releasing of another combined
1310 * signal, so we don't want to match.
1311 * eg: AB -(release B)-> A -(release A)-> 0 :
1312 * don't match A.
1313 */
1314 if ((phys_prev & input->mask) == input->value)
1315 break;
1316 input->rise_timer = 0;
1317 input->state = INPUT_ST_RISING;
1318 fallthrough;
1319 case INPUT_ST_RISING:
1320 if ((phys_curr & input->mask) != input->value) {
1321 input->state = INPUT_ST_LOW;
1322 break;
1323 }
1324 if (input->rise_timer < input->rise_time) {
1325 inputs_stable = 0;
1326 input->rise_timer++;
1327 break;
1328 }
1329 input->high_timer = 0;
1330 input->state = INPUT_ST_HIGH;
1331 fallthrough;
1332 case INPUT_ST_HIGH:
1333 if (input_state_high(input))
1334 break;
1335 fallthrough;
1336 case INPUT_ST_FALLING:
1337 input_state_falling(input);
1338 }
1339 }
1340 }
1341
panel_scan_timer(struct timer_list * unused)1342 static void panel_scan_timer(struct timer_list *unused)
1343 {
1344 if (keypad.enabled && keypad_initialized) {
1345 if (spin_trylock_irq(&pprt_lock)) {
1346 phys_scan_contacts();
1347
1348 /* no need for the parport anymore */
1349 spin_unlock_irq(&pprt_lock);
1350 }
1351
1352 if (!inputs_stable || phys_curr != phys_prev)
1353 panel_process_inputs();
1354 }
1355
1356 if (keypressed && lcd.enabled && lcd.initialized)
1357 charlcd_poke(lcd.charlcd);
1358
1359 mod_timer(&scan_timer, jiffies + INPUT_POLL_TIME);
1360 }
1361
init_scan_timer(void)1362 static void init_scan_timer(void)
1363 {
1364 if (scan_timer.function)
1365 return; /* already started */
1366
1367 timer_setup(&scan_timer, panel_scan_timer, 0);
1368 scan_timer.expires = jiffies + INPUT_POLL_TIME;
1369 add_timer(&scan_timer);
1370 }
1371
1372 /* converts a name of the form "({BbAaPpSsEe}{01234567-})*" to a series of bits.
1373 * if <omask> or <imask> are non-null, they will be or'ed with the bits
1374 * corresponding to out and in bits respectively.
1375 * returns 1 if ok, 0 if error (in which case, nothing is written).
1376 */
input_name2mask(const char * name,__u64 * mask,__u64 * value,u8 * imask,u8 * omask)1377 static u8 input_name2mask(const char *name, __u64 *mask, __u64 *value,
1378 u8 *imask, u8 *omask)
1379 {
1380 const char sigtab[] = "EeSsPpAaBb";
1381 u8 im, om;
1382 __u64 m, v;
1383
1384 om = 0;
1385 im = 0;
1386 m = 0ULL;
1387 v = 0ULL;
1388 while (*name) {
1389 int in, out, bit, neg;
1390 const char *idx;
1391
1392 idx = strchr(sigtab, *name);
1393 if (!idx)
1394 return 0; /* input name not found */
1395
1396 in = idx - sigtab;
1397 neg = (in & 1); /* odd (lower) names are negated */
1398 in >>= 1;
1399 im |= BIT(in);
1400
1401 name++;
1402 if (*name >= '0' && *name <= '7') {
1403 out = *name - '0';
1404 om |= BIT(out);
1405 } else if (*name == '-') {
1406 out = 8;
1407 } else {
1408 return 0; /* unknown bit name */
1409 }
1410
1411 bit = (out * 5) + in;
1412
1413 m |= 1ULL << bit;
1414 if (!neg)
1415 v |= 1ULL << bit;
1416 name++;
1417 }
1418 *mask = m;
1419 *value = v;
1420 if (imask)
1421 *imask |= im;
1422 if (omask)
1423 *omask |= om;
1424 return 1;
1425 }
1426
1427 /* tries to bind a key to the signal name <name>. The key will send the
1428 * strings <press>, <repeat>, <release> for these respective events.
1429 * Returns the pointer to the new key if ok, NULL if the key could not be bound.
1430 */
panel_bind_key(const char * name,const char * press,const char * repeat,const char * release)1431 static struct logical_input *panel_bind_key(const char *name, const char *press,
1432 const char *repeat,
1433 const char *release)
1434 {
1435 struct logical_input *key;
1436
1437 key = kzalloc(sizeof(*key), GFP_KERNEL);
1438 if (!key)
1439 return NULL;
1440
1441 if (!input_name2mask(name, &key->mask, &key->value, &scan_mask_i,
1442 &scan_mask_o)) {
1443 kfree(key);
1444 return NULL;
1445 }
1446
1447 key->type = INPUT_TYPE_KBD;
1448 key->state = INPUT_ST_LOW;
1449 key->rise_time = 1;
1450 key->fall_time = 1;
1451
1452 strtomem_pad(key->u.kbd.press_str, press, '\0');
1453 strtomem_pad(key->u.kbd.repeat_str, repeat, '\0');
1454 strtomem_pad(key->u.kbd.release_str, release, '\0');
1455 list_add(&key->list, &logical_inputs);
1456 return key;
1457 }
1458
1459 #if 0
1460 /* tries to bind a callback function to the signal name <name>. The function
1461 * <press_fct> will be called with the <press_data> arg when the signal is
1462 * activated, and so on for <release_fct>/<release_data>
1463 * Returns the pointer to the new signal if ok, NULL if the signal could not
1464 * be bound.
1465 */
1466 static struct logical_input *panel_bind_callback(char *name,
1467 void (*press_fct)(int),
1468 int press_data,
1469 void (*release_fct)(int),
1470 int release_data)
1471 {
1472 struct logical_input *callback;
1473
1474 callback = kmalloc(sizeof(*callback), GFP_KERNEL);
1475 if (!callback)
1476 return NULL;
1477
1478 memset(callback, 0, sizeof(struct logical_input));
1479 if (!input_name2mask(name, &callback->mask, &callback->value,
1480 &scan_mask_i, &scan_mask_o))
1481 return NULL;
1482
1483 callback->type = INPUT_TYPE_STD;
1484 callback->state = INPUT_ST_LOW;
1485 callback->rise_time = 1;
1486 callback->fall_time = 1;
1487 callback->u.std.press_fct = press_fct;
1488 callback->u.std.press_data = press_data;
1489 callback->u.std.release_fct = release_fct;
1490 callback->u.std.release_data = release_data;
1491 list_add(&callback->list, &logical_inputs);
1492 return callback;
1493 }
1494 #endif
1495
keypad_init(void)1496 static void keypad_init(void)
1497 {
1498 int keynum;
1499
1500 init_waitqueue_head(&keypad_read_wait);
1501 keypad_buflen = 0; /* flushes any eventual noisy keystroke */
1502
1503 /* Let's create all known keys */
1504
1505 for (keynum = 0; keypad_profile[keynum][0][0]; keynum++) {
1506 panel_bind_key(keypad_profile[keynum][0],
1507 keypad_profile[keynum][1],
1508 keypad_profile[keynum][2],
1509 keypad_profile[keynum][3]);
1510 }
1511
1512 init_scan_timer();
1513 keypad_initialized = 1;
1514 }
1515
1516 /**************************************************/
1517 /* device initialization */
1518 /**************************************************/
1519
panel_attach(struct parport * port)1520 static void panel_attach(struct parport *port)
1521 {
1522 int selected_keypad_type = NOT_SET;
1523 struct pardev_cb panel_cb;
1524
1525 /* take care of an eventual profile */
1526 switch (profile) {
1527 case PANEL_PROFILE_CUSTOM:
1528 /* custom profile */
1529 selected_keypad_type = DEFAULT_KEYPAD_TYPE;
1530 selected_lcd_type = DEFAULT_LCD_TYPE;
1531 break;
1532 case PANEL_PROFILE_OLD:
1533 /* 8 bits, 2*16, old keypad */
1534 selected_keypad_type = KEYPAD_TYPE_OLD;
1535 selected_lcd_type = LCD_TYPE_OLD;
1536
1537 /* TODO: This two are a little hacky, sort it out later */
1538 if (lcd_width == NOT_SET)
1539 lcd_width = 16;
1540 if (lcd_hwidth == NOT_SET)
1541 lcd_hwidth = 16;
1542 break;
1543 case PANEL_PROFILE_NEW:
1544 /* serial, 2*16, new keypad */
1545 selected_keypad_type = KEYPAD_TYPE_NEW;
1546 selected_lcd_type = LCD_TYPE_KS0074;
1547 break;
1548 case PANEL_PROFILE_HANTRONIX:
1549 /* 8 bits, 2*16 hantronix-like, no keypad */
1550 selected_keypad_type = KEYPAD_TYPE_NONE;
1551 selected_lcd_type = LCD_TYPE_HANTRONIX;
1552 break;
1553 case PANEL_PROFILE_NEXCOM:
1554 /* generic 8 bits, 2*16, nexcom keypad, eg. Nexcom. */
1555 selected_keypad_type = KEYPAD_TYPE_NEXCOM;
1556 selected_lcd_type = LCD_TYPE_NEXCOM;
1557 break;
1558 case PANEL_PROFILE_LARGE:
1559 /* 8 bits, 2*40, old keypad */
1560 selected_keypad_type = KEYPAD_TYPE_OLD;
1561 selected_lcd_type = LCD_TYPE_OLD;
1562 break;
1563 }
1564
1565 /*
1566 * Overwrite selection with module param values (both keypad and lcd),
1567 * where the deprecated params have lower prio.
1568 */
1569 if (keypad_enabled != NOT_SET)
1570 selected_keypad_type = keypad_enabled;
1571 if (keypad_type != NOT_SET)
1572 selected_keypad_type = keypad_type;
1573
1574 keypad.enabled = (selected_keypad_type > 0);
1575
1576 if (lcd_enabled != NOT_SET)
1577 selected_lcd_type = lcd_enabled;
1578 if (lcd_type != NOT_SET)
1579 selected_lcd_type = lcd_type;
1580
1581 lcd.enabled = (selected_lcd_type > 0);
1582
1583 if (lcd.enabled) {
1584 /*
1585 * Init lcd struct with load-time values to preserve exact
1586 * current functionality (at least for now).
1587 */
1588 lcd.charset = lcd_charset;
1589 lcd.proto = lcd_proto;
1590 lcd.pins.e = lcd_e_pin;
1591 lcd.pins.rs = lcd_rs_pin;
1592 lcd.pins.rw = lcd_rw_pin;
1593 lcd.pins.cl = lcd_cl_pin;
1594 lcd.pins.da = lcd_da_pin;
1595 lcd.pins.bl = lcd_bl_pin;
1596 }
1597
1598 switch (selected_keypad_type) {
1599 case KEYPAD_TYPE_OLD:
1600 keypad_profile = old_keypad_profile;
1601 break;
1602 case KEYPAD_TYPE_NEW:
1603 keypad_profile = new_keypad_profile;
1604 break;
1605 case KEYPAD_TYPE_NEXCOM:
1606 keypad_profile = nexcom_keypad_profile;
1607 break;
1608 default:
1609 keypad_profile = NULL;
1610 break;
1611 }
1612
1613 if (!lcd.enabled && !keypad.enabled) {
1614 /* no device enabled, let's exit */
1615 pr_err("panel driver disabled.\n");
1616 return;
1617 }
1618
1619 if (port->number != parport)
1620 return;
1621
1622 if (pprt) {
1623 pr_err("%s: port->number=%d parport=%d, already registered!\n",
1624 __func__, port->number, parport);
1625 return;
1626 }
1627
1628 memset(&panel_cb, 0, sizeof(panel_cb));
1629 panel_cb.private = &pprt;
1630 /* panel_cb.flags = 0 should be PARPORT_DEV_EXCL? */
1631
1632 pprt = parport_register_dev_model(port, "panel", &panel_cb, 0);
1633 if (!pprt) {
1634 pr_err("%s: port->number=%d parport=%d, parport_register_device() failed\n",
1635 __func__, port->number, parport);
1636 return;
1637 }
1638
1639 if (parport_claim(pprt)) {
1640 pr_err("could not claim access to parport%d. Aborting.\n",
1641 parport);
1642 goto err_unreg_device;
1643 }
1644
1645 /* must init LCD first, just in case an IRQ from the keypad is
1646 * generated at keypad init
1647 */
1648 if (lcd.enabled) {
1649 lcd_init();
1650 if (!lcd.charlcd || charlcd_register(lcd.charlcd))
1651 goto err_unreg_device;
1652 }
1653
1654 if (keypad.enabled) {
1655 keypad_init();
1656 if (misc_register(&keypad_dev))
1657 goto err_lcd_unreg;
1658 }
1659 return;
1660
1661 err_lcd_unreg:
1662 if (scan_timer.function)
1663 del_timer_sync(&scan_timer);
1664 if (lcd.enabled)
1665 charlcd_unregister(lcd.charlcd);
1666 err_unreg_device:
1667 kfree(lcd.charlcd);
1668 lcd.charlcd = NULL;
1669 parport_unregister_device(pprt);
1670 pprt = NULL;
1671 }
1672
panel_detach(struct parport * port)1673 static void panel_detach(struct parport *port)
1674 {
1675 if (port->number != parport)
1676 return;
1677
1678 if (!pprt) {
1679 pr_err("%s: port->number=%d parport=%d, nothing to unregister.\n",
1680 __func__, port->number, parport);
1681 return;
1682 }
1683 if (scan_timer.function)
1684 del_timer_sync(&scan_timer);
1685
1686 if (keypad.enabled) {
1687 misc_deregister(&keypad_dev);
1688 keypad_initialized = 0;
1689 }
1690
1691 if (lcd.enabled) {
1692 charlcd_unregister(lcd.charlcd);
1693 lcd.initialized = false;
1694 kfree(lcd.charlcd->drvdata);
1695 kfree(lcd.charlcd);
1696 lcd.charlcd = NULL;
1697 }
1698
1699 /* TODO: free all input signals */
1700 parport_release(pprt);
1701 parport_unregister_device(pprt);
1702 pprt = NULL;
1703 }
1704
1705 static struct parport_driver panel_driver = {
1706 .name = "panel",
1707 .match_port = panel_attach,
1708 .detach = panel_detach,
1709 };
1710 module_parport_driver(panel_driver);
1711
1712 MODULE_AUTHOR("Willy Tarreau");
1713 MODULE_LICENSE("GPL");
1714