cregit-Linux how code gets into the kernel

Release 4.14 drivers/auxdisplay/panel.c

/*
 * Front panel driver for Linux
 * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
 * Copyright (C) 2016-2017 Glider bvba
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 *
 * This code drives an LCD module (/dev/lcd), and a keypad (/dev/keypad)
 * connected to a parallel printer port.
 *
 * The LCD module may either be an HD44780-like 8-bit parallel LCD, or a 1-bit
 * serial module compatible with Samsung's KS0074. The pins may be connected in
 * any combination, everything is programmable.
 *
 * The keypad consists in a matrix of push buttons connecting input pins to
 * data output pins or to the ground. The combinations have to be hard-coded
 * in the driver, though several profiles exist and adding new ones is easy.
 *
 * Several profiles are provided for commonly found LCD+keypad modules on the
 * market, such as those found in Nexcom's appliances.
 *
 * FIXME:
 *      - the initialization/deinitialization process is very dirty and should
 *        be rewritten. It may even be buggy.
 *
 * TODO:
 *      - document 24 keys keyboard (3 rows of 8 cols, 32 diodes + 2 inputs)
 *      - make the LCD a part of a virtual screen of Vx*Vy
 *      - make the inputs list smp-safe
 *      - change the keyboard to a double mapping : signals -> key_id -> values
 *        so that applications can change values without knowing signals
 *
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/miscdevice.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/fcntl.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/parport.h>
#include <linux/list.h>

#include <linux/io.h>
#include <linux/uaccess.h>

#include <misc/charlcd.h>


#define KEYPAD_MINOR		185


#define LCD_MAXBYTES		256	
/* max burst write */


#define KEYPAD_BUFFER		64

/* poll the keyboard this every second */

#define INPUT_POLL_TIME		(HZ / 50)
/* a key starts to repeat after this times INPUT_POLL_TIME */

#define KEYPAD_REP_START	(10)
/* a key repeats this times INPUT_POLL_TIME */

#define KEYPAD_REP_DELAY	(2)

/* converts an r_str() input to an active high, bits string : 000BAOSE */

#define PNL_PINPUT(a)		((((unsigned char)(a)) ^ 0x7F) >> 3)


#define PNL_PBUSY		0x80	
/* inverted input, active low */

#define PNL_PACK		0x40	
/* direct input, active low */

#define PNL_POUTPA		0x20	
/* direct input, active high */

#define PNL_PSELECD		0x10	
/* direct input, active high */

#define PNL_PERRORP		0x08	
/* direct input, active low */


#define PNL_PBIDIR		0x20	
/* bi-directional ports */
/* high to read data in or-ed with data out */

#define PNL_PINTEN		0x10

#define PNL_PSELECP		0x08	
/* inverted output, active low */

#define PNL_PINITP		0x04	
/* direct output, active low */

#define PNL_PAUTOLF		0x02	
/* inverted output, active low */

#define PNL_PSTROBE		0x01	
/* inverted output */


#define PNL_PD0			0x01

#define PNL_PD1			0x02

#define PNL_PD2			0x04

#define PNL_PD3			0x08

#define PNL_PD4			0x10

#define PNL_PD5			0x20

#define PNL_PD6			0x40

#define PNL_PD7			0x80


#define PIN_NONE		0

#define PIN_STROBE		1

#define PIN_D0			2

#define PIN_D1			3

#define PIN_D2			4

#define PIN_D3			5

#define PIN_D4			6

#define PIN_D5			7

#define PIN_D6			8

#define PIN_D7			9

#define PIN_AUTOLF		14

#define PIN_INITP		16

#define PIN_SELECP		17

#define PIN_NOT_SET		127


#define NOT_SET			-1

/* macros to simplify use of the parallel port */

#define r_ctr(x)        (parport_read_control((x)->port))

#define r_dtr(x)        (parport_read_data((x)->port))

#define r_str(x)        (parport_read_status((x)->port))

#define w_ctr(x, y)     (parport_write_control((x)->port, (y)))

#define w_dtr(x, y)     (parport_write_data((x)->port, (y)))

/* this defines which bits are to be used and which ones to be ignored */
/* logical or of the output bits involved in the scan matrix */

static __u8 scan_mask_o;
/* logical or of the input bits involved in the scan matrix */

static __u8 scan_mask_i;


enum input_type {
	
INPUT_TYPE_STD,
	
INPUT_TYPE_KBD,
};


enum input_state {
	
INPUT_ST_LOW,
	
INPUT_ST_RISING,
	
INPUT_ST_HIGH,
	
INPUT_ST_FALLING,
};


struct logical_input {
	
struct list_head list;
	
__u64 mask;
	
__u64 value;
	
enum input_type type;
	
enum input_state state;
	

__u8 rise_time, fall_time;
	


__u8 rise_timer, fall_timer, high_timer;

	union {
		struct {	/* valid when type == INPUT_TYPE_STD */
			
void (*press_fct)(int);
			
void (*release_fct)(int);
			
int press_data;
			
int release_data;
		
} std;
		struct {	/* valid when type == INPUT_TYPE_KBD */
			/* strings can be non null-terminated */
			
char press_str[sizeof(void *) + sizeof(int)];
			
char repeat_str[sizeof(void *) + sizeof(int)];
			
char release_str[sizeof(void *) + sizeof(int)];
		
} kbd;
	
} u;
};

static LIST_HEAD(logical_inputs);	/* list of all defined logical inputs */

/* physical contacts history
 * Physical contacts are a 45 bits string of 9 groups of 5 bits each.
 * The 8 lower groups correspond to output bits 0 to 7, and the 9th group
 * corresponds to the ground.
 * Within each group, bits are stored in the same order as read on the port :
 * BAPSE (busy=4, ack=3, paper empty=2, select=1, error=0).
 * So, each __u64 is represented like this :
 * 0000000000000000000BAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSEBAPSE
 * <-----unused------><gnd><d07><d06><d05><d04><d03><d02><d01><d00>
 */

/* what has just been read from the I/O ports */

static __u64 phys_read;
/* previous phys_read */

static __u64 phys_read_prev;
/* stabilized phys_read (phys_read|phys_read_prev) */

static __u64 phys_curr;
/* previous phys_curr */

static __u64 phys_prev;
/* 0 means that at least one logical signal needs be computed */

static char inputs_stable;

/* these variables are specific to the keypad */
static struct {
	
bool enabled;

} keypad;


static char keypad_buffer[KEYPAD_BUFFER];

static int keypad_buflen;

static int keypad_start;

static char keypressed;

static wait_queue_head_t keypad_read_wait;

/* lcd-specific variables */
static struct {
	
bool enabled;
	
bool initialized;

	
int charset;
	
int proto;

	/* TODO: use union here? */
	struct {
		
int e;
		
int rs;
		
int rw;
		
int cl;
		
int da;
		
int bl;
	
} pins;

	
struct charlcd *charlcd;

} lcd;

/* Needed only for init */

static int selected_lcd_type = NOT_SET;

/*
 * Bit masks to convert LCD signals to parallel port outputs.
 * _d_ are values for data port, _c_ are for control port.
 * [0] = signal OFF, [1] = signal ON, [2] = mask
 */

#define BIT_CLR		0

#define BIT_SET		1

#define BIT_MSK		2

#define BIT_STATES	3
/*
 * one entry for each bit on the LCD
 */

#define LCD_BIT_E	0

#define LCD_BIT_RS	1

#define LCD_BIT_RW	2

#define LCD_BIT_BL	3

#define LCD_BIT_CL	4

#define LCD_BIT_DA	5

#define LCD_BITS	6

/*
 * each bit can be either connected to a DATA or CTRL port
 */

#define LCD_PORT_C	0

#define LCD_PORT_D	1

#define LCD_PORTS	2


static unsigned char lcd_bits[LCD_PORTS][LCD_BITS][BIT_STATES];

/*
 * LCD protocols
 */

#define LCD_PROTO_PARALLEL      0

#define LCD_PROTO_SERIAL        1

#define LCD_PROTO_TI_DA8XX_LCD	2

/*
 * LCD character sets
 */

#define LCD_CHARSET_NORMAL      0

#define LCD_CHARSET_KS0074      1

/*
 * LCD types
 */

#define LCD_TYPE_NONE		0

#define LCD_TYPE_CUSTOM		1

#define LCD_TYPE_OLD		2

#define LCD_TYPE_KS0074		3

#define LCD_TYPE_HANTRONIX	4

#define LCD_TYPE_NEXCOM		5

/*
 * keypad types
 */

#define KEYPAD_TYPE_NONE	0

#define KEYPAD_TYPE_OLD		1

#define KEYPAD_TYPE_NEW		2

#define KEYPAD_TYPE_NEXCOM	3

/*
 * panel profiles
 */

#define PANEL_PROFILE_CUSTOM	0

#define PANEL_PROFILE_OLD	1

#define PANEL_PROFILE_NEW	2

#define PANEL_PROFILE_HANTRONIX	3

#define PANEL_PROFILE_NEXCOM	4

#define PANEL_PROFILE_LARGE	5

/*
 * Construct custom config from the kernel's configuration
 */

#define DEFAULT_PARPORT         0

#define DEFAULT_PROFILE         PANEL_PROFILE_LARGE

#define DEFAULT_KEYPAD_TYPE     KEYPAD_TYPE_OLD

#define DEFAULT_LCD_TYPE        LCD_TYPE_OLD

#define DEFAULT_LCD_HEIGHT      2

#define DEFAULT_LCD_WIDTH       40

#define DEFAULT_LCD_BWIDTH      40

#define DEFAULT_LCD_HWIDTH      64

#define DEFAULT_LCD_CHARSET     LCD_CHARSET_NORMAL

#define DEFAULT_LCD_PROTO       LCD_PROTO_PARALLEL


#define DEFAULT_LCD_PIN_E       PIN_AUTOLF

#define DEFAULT_LCD_PIN_RS      PIN_SELECP

#define DEFAULT_LCD_PIN_RW      PIN_INITP

#define DEFAULT_LCD_PIN_SCL     PIN_STROBE

#define DEFAULT_LCD_PIN_SDA     PIN_D0

#define DEFAULT_LCD_PIN_BL      PIN_NOT_SET

#ifdef CONFIG_PANEL_PARPORT

#undef DEFAULT_PARPORT

#define DEFAULT_PARPORT CONFIG_PANEL_PARPORT
#endif

#ifdef CONFIG_PANEL_PROFILE

#undef DEFAULT_PROFILE

#define DEFAULT_PROFILE CONFIG_PANEL_PROFILE
#endif

#if DEFAULT_PROFILE == 0	/* custom */
#ifdef CONFIG_PANEL_KEYPAD

#undef DEFAULT_KEYPAD_TYPE

#define DEFAULT_KEYPAD_TYPE CONFIG_PANEL_KEYPAD
#endif

#ifdef CONFIG_PANEL_LCD

#undef DEFAULT_LCD_TYPE

#define DEFAULT_LCD_TYPE CONFIG_PANEL_LCD
#endif

#ifdef CONFIG_PANEL_LCD_HEIGHT

#undef DEFAULT_LCD_HEIGHT

#define DEFAULT_LCD_HEIGHT CONFIG_PANEL_LCD_HEIGHT
#endif

#ifdef CONFIG_PANEL_LCD_WIDTH

#undef DEFAULT_LCD_WIDTH

#define DEFAULT_LCD_WIDTH CONFIG_PANEL_LCD_WIDTH
#endif

#ifdef CONFIG_PANEL_LCD_BWIDTH

#undef DEFAULT_LCD_BWIDTH

#define DEFAULT_LCD_BWIDTH CONFIG_PANEL_LCD_BWIDTH
#endif

#ifdef CONFIG_PANEL_LCD_HWIDTH

#undef DEFAULT_LCD_HWIDTH

#define DEFAULT_LCD_HWIDTH CONFIG_PANEL_LCD_HWIDTH
#endif

#ifdef CONFIG_PANEL_LCD_CHARSET

#undef DEFAULT_LCD_CHARSET

#define DEFAULT_LCD_CHARSET CONFIG_PANEL_LCD_CHARSET
#endif

#ifdef CONFIG_PANEL_LCD_PROTO

#undef DEFAULT_LCD_PROTO

#define DEFAULT_LCD_PROTO CONFIG_PANEL_LCD_PROTO
#endif

#ifdef CONFIG_PANEL_LCD_PIN_E

#undef DEFAULT_LCD_PIN_E

#define DEFAULT_LCD_PIN_E CONFIG_PANEL_LCD_PIN_E
#endif

#ifdef CONFIG_PANEL_LCD_PIN_RS

#undef DEFAULT_LCD_PIN_RS

#define DEFAULT_LCD_PIN_RS CONFIG_PANEL_LCD_PIN_RS
#endif

#ifdef CONFIG_PANEL_LCD_PIN_RW

#undef DEFAULT_LCD_PIN_RW

#define DEFAULT_LCD_PIN_RW CONFIG_PANEL_LCD_PIN_RW
#endif

#ifdef CONFIG_PANEL_LCD_PIN_SCL

#undef DEFAULT_LCD_PIN_SCL

#define DEFAULT_LCD_PIN_SCL CONFIG_PANEL_LCD_PIN_SCL
#endif

#ifdef CONFIG_PANEL_LCD_PIN_SDA

#undef DEFAULT_LCD_PIN_SDA

#define DEFAULT_LCD_PIN_SDA CONFIG_PANEL_LCD_PIN_SDA
#endif

#ifdef CONFIG_PANEL_LCD_PIN_BL

#undef DEFAULT_LCD_PIN_BL

#define DEFAULT_LCD_PIN_BL CONFIG_PANEL_LCD_PIN_BL
#endif

#endif /* DEFAULT_PROFILE == 0 */

/* global variables */

/* Device single-open policy control */

static atomic_t keypad_available = ATOMIC_INIT(1);


static struct pardevice *pprt;


static int keypad_initialized;

static DEFINE_SPINLOCK(pprt_lock);

static struct timer_list scan_timer;

MODULE_DESCRIPTION("Generic parallel port LCD/Keypad driver");


static int parport = DEFAULT_PARPORT;
module_param(parport, int, 0000);
MODULE_PARM_DESC(parport, "Parallel port index (0=lpt1, 1=lpt2, ...)");


static int profile = DEFAULT_PROFILE;
module_param(profile, int, 0000);
MODULE_PARM_DESC(profile,
		 "1=16x2 old kp; 2=serial 16x2, new kp; 3=16x2 hantronix; "
		 "4=16x2 nexcom; default=40x2, old kp");


static int keypad_type = NOT_SET;
module_param(keypad_type, int, 0000);
MODULE_PARM_DESC(keypad_type,
		 "Keypad type: 0=none, 1=old 6 keys, 2=new 6+1 keys, 3=nexcom 4 keys");


static int lcd_type = NOT_SET;
module_param(lcd_type, int, 0000);
MODULE_PARM_DESC(lcd_type,
		 "LCD type: 0=none, 1=compiled-in, 2=old, 3=serial ks0074, 4=hantronix, 5=nexcom");


static int lcd_height = NOT_SET;
module_param(lcd_height, int, 0000);
MODULE_PARM_DESC(lcd_height, "Number of lines on the LCD");


static int lcd_width = NOT_SET;
module_param(lcd_width, int, 0000);
MODULE_PARM_DESC(lcd_width, "Number of columns on the LCD");


static int lcd_bwidth = NOT_SET;	
/* internal buffer width (usually 40) */
module_param(lcd_bwidth, int, 0000);
MODULE_PARM_DESC(lcd_bwidth, "Internal LCD line width (40)");


static int lcd_hwidth = NOT_SET;	
/* hardware buffer width (usually 64) */
module_param(lcd_hwidth, int, 0000);
MODULE_PARM_DESC(lcd_hwidth, "LCD line hardware address (64)");


static int lcd_charset = NOT_SET;
module_param(lcd_charset, int, 0000);
MODULE_PARM_DESC(lcd_charset, "LCD character set: 0=standard, 1=KS0074");


static int lcd_proto = NOT_SET;
module_param(lcd_proto, int, 0000);
MODULE_PARM_DESC(lcd_proto,
		 "LCD communication: 0=parallel (//), 1=serial, 2=TI LCD Interface");

/*
 * These are the parallel port pins the LCD control signals are connected to.
 * Set this to 0 if the signal is not used. Set it to its opposite value
 * (negative) if the signal is negated. -MAXINT is used to indicate that the
 * pin has not been explicitly specified.
 *
 * WARNING! no check will be performed about collisions with keypad !
 */


static int lcd_e_pin  = PIN_NOT_SET;
module_param(lcd_e_pin, int, 0000);
MODULE_PARM_DESC(lcd_e_pin,
		 "# of the // port pin connected to LCD 'E' signal, with polarity (-17..17)");


static int lcd_rs_pin = PIN_NOT_SET;
module_param(lcd_rs_pin, int, 0000);
MODULE_PARM_DESC(lcd_rs_pin,
		 "# of the // port pin connected to LCD 'RS' signal, with polarity (-17..17)");


static int lcd_rw_pin = PIN_NOT_SET;
module_param(lcd_rw_pin, int, 0000);
MODULE_PARM_DESC(lcd_rw_pin,
		 "# of the // port pin connected to LCD 'RW' signal, with polarity (-17..17)");


static int lcd_cl_pin = PIN_NOT_SET;
module_param(lcd_cl_pin, int, 0000);
MODULE_PARM_DESC(lcd_cl_pin,
		 "# of the // port pin connected to serial LCD 'SCL' signal, with polarity (-17..17)");


static int lcd_da_pin = PIN_NOT_SET;
module_param(lcd_da_pin, int, 0000);
MODULE_PARM_DESC(lcd_da_pin,
		 "# of the // port pin connected to serial LCD 'SDA' signal, with polarity (-17..17)");


static int lcd_bl_pin = PIN_NOT_SET;
module_param(lcd_bl_pin, int, 0000);
MODULE_PARM_DESC(lcd_bl_pin,
		 "# of the // port pin connected to LCD backlight, with polarity (-17..17)");

/* Deprecated module parameters - consider not using them anymore */


static int lcd_enabled = NOT_SET;
module_param(lcd_enabled, int, 0000);
MODULE_PARM_DESC(lcd_enabled, "Deprecated option, use lcd_type instead");


static int keypad_enabled = NOT_SET;
module_param(keypad_enabled, int, 0000);
MODULE_PARM_DESC(keypad_enabled, "Deprecated option, use keypad_type instead");

/* for some LCD drivers (ks0074) we need a charset conversion table. */

static const unsigned char lcd_char_conv_ks0074[256] = {
	/*          0|8   1|9   2|A   3|B   4|C   5|D   6|E   7|F */
	/* 0x00 */ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
	/* 0x08 */ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
	/* 0x10 */ 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
	/* 0x18 */ 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
	/* 0x20 */ 0x20, 0x21, 0x22, 0x23, 0xa2, 0x25, 0x26, 0x27,
	/* 0x28 */ 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
	/* 0x30 */ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
	/* 0x38 */ 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
	/* 0x40 */ 0xa0, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
	/* 0x48 */ 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
	/* 0x50 */ 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
	/* 0x58 */ 0x58, 0x59, 0x5a, 0xfa, 0xfb, 0xfc, 0x1d, 0xc4,
	/* 0x60 */ 0x96, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
	/* 0x68 */ 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
	/* 0x70 */ 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
	/* 0x78 */ 0x78, 0x79, 0x7a, 0xfd, 0xfe, 0xff, 0xce, 0x20,
	/* 0x80 */ 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
	/* 0x88 */ 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
	/* 0x90 */ 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
	/* 0x98 */ 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
	/* 0xA0 */ 0x20, 0x40, 0xb1, 0xa1, 0x24, 0xa3, 0xfe, 0x5f,
	/* 0xA8 */ 0x22, 0xc8, 0x61, 0x14, 0x97, 0x2d, 0xad, 0x96,
	/* 0xB0 */ 0x80, 0x8c, 0x82, 0x83, 0x27, 0x8f, 0x86, 0xdd,
	/* 0xB8 */ 0x2c, 0x81, 0x6f, 0x15, 0x8b, 0x8a, 0x84, 0x60,
	/* 0xC0 */ 0xe2, 0xe2, 0xe2, 0x5b, 0x5b, 0xae, 0xbc, 0xa9,
	/* 0xC8 */ 0xc5, 0xbf, 0xc6, 0xf1, 0xe3, 0xe3, 0xe3, 0xe3,
	/* 0xD0 */ 0x44, 0x5d, 0xa8, 0xe4, 0xec, 0xec, 0x5c, 0x78,
	/* 0xD8 */ 0xab, 0xa6, 0xe5, 0x5e, 0x5e, 0xe6, 0xaa, 0xbe,
	/* 0xE0 */ 0x7f, 0xe7, 0xaf, 0x7b, 0x7b, 0xaf, 0xbd, 0xc8,
	/* 0xE8 */ 0xa4, 0xa5, 0xc7, 0xf6, 0xa7, 0xe8, 0x69, 0x69,
	/* 0xF0 */ 0xed, 0x7d, 0xa8, 0xe4, 0xec, 0x5c, 0x5c, 0x25,
	/* 0xF8 */ 0xac, 0xa6, 0xea, 0xef, 0x7e, 0xeb, 0xb2, 0x79,
};


static const char old_keypad_profile[][4][9] = {
	{"S0", "Left\n", "Left\n", ""},
	{"S1", "Down\n", "Down\n", ""},
	{"S2", "Up\n", "Up\n", ""},
	{"S3", "Right\n", "Right\n", ""},
	{"S4", "Esc\n", "Esc\n", ""},
	{"S5", "Ret\n", "Ret\n", ""},
	{"", "", "", ""}
};

/* signals, press, repeat, release */

static const char new_keypad_profile[][4][9] = {
	{"S0", "Left\n", "Left\n", ""},
	{"S1", "Down\n", "Down\n", ""},
	{"S2", "Up\n", "Up\n", ""},
	{"S3", "Right\n", "Right\n", ""},
	{"S4s5", "", "Esc\n", "Esc\n"},
	{"s4S5", "", "Ret\n", "Ret\n"},
	{"S4S5", "Help\n", "", ""},
	/* add new signals above this line */
	{"", "", "", ""}
};

/* signals, press, repeat, release */

static const char nexcom_keypad_profile[][4][9] = {
	{"a-p-e-", "Down\n", "Down\n", ""},
	{"a-p-E-", "Ret\n", "Ret\n", ""},
	{"a-P-E-", "Esc\n", "Esc\n", ""},
	{"a-P-e-", "Up\n", "Up\n", ""},
	/* add new signals above this line */
	{"", "", "", ""}
};


static const char (*keypad_profile)[4][9] = old_keypad_profile;

static DECLARE_BITMAP(bits, LCD_BITS);


static void lcd_get_bits(unsigned int port, int *val) { unsigned int bit, state; for (bit = 0; bit < LCD_BITS; bit++) { state = test_bit(bit, bits) ? BIT_SET : BIT_CLR; *val &= lcd_bits[port][bit][BIT_MSK]; *val |= lcd_bits[port][bit][state]; } }

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Willy Tarreau4356.58%150.00%
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Total76100.00%2100.00%

/* sets data port bits according to current signals values */
static int set_data_bits(void) { int val; val = r_dtr(pprt); lcd_get_bits(LCD_PORT_D, &val); w_dtr(pprt, val); return val; }

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Daniel Chromik2363.89%150.00%
Willy Tarreau1336.11%150.00%
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/* sets ctrl port bits according to current signals values */
static int set_ctrl_bits(void) { int val; val = r_ctr(pprt); lcd_get_bits(LCD_PORT_C, &val); w_ctr(pprt, val); return val; }

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Willy Tarreau3186.11%150.00%
Daniel Chromik513.89%150.00%
Total36100.00%2100.00%

/* sets ctrl & data port bits according to current signals values */
static void panel_set_bits(void) { set_data_bits(); set_ctrl_bits(); }

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Willy Tarreau1392.86%150.00%
Sachin P. Sant17.14%150.00%
Total14100.00%2100.00%

/* * Converts a parallel port pin (from -25 to 25) to data and control ports * masks, and data and control port bits. The signal will be considered * unconnected if it's on pin 0 or an invalid pin (<-25 or >25). * * Result will be used this way : * out(dport, in(dport) & d_val[2] | d_val[signal_state]) * out(cport, in(cport) & c_val[2] | c_val[signal_state]) */
static void pin_to_bits(int pin, unsigned char *d_val, unsigned char *c_val) { int d_bit, c_bit, inv; d_val[0] = 0; c_val[0] = 0; d_val[1] = 0; c_val[1] = 0; d_val[2] = 0xFF; c_val[2] = 0xFF; if (pin == 0) return; inv = (pin < 0); if (inv) pin = -pin; d_bit = 0; c_bit = 0; switch (pin) { case PIN_STROBE: /* strobe, inverted */ c_bit = PNL_PSTROBE; inv = !inv; break; case PIN_D0...PIN_D7: /* D0 - D7 = 2 - 9 */ d_bit = 1 << (pin - 2); break; case PIN_AUTOLF: /* autofeed, inverted */ c_bit = PNL_PAUTOLF; inv = !inv; break; case PIN_INITP: /* init, direct */ c_bit = PNL_PINITP; break; case PIN_SELECP: /* select_in, inverted */ c_bit = PNL_PSELECP; inv = !inv; break; default: /* unknown pin, ignore */ break; } if (c_bit) { c_val[2] &= ~c_bit; c_val[!inv] = c_bit; } else if (d_bit) { d_val[2] &= ~d_bit; d_val[!inv] = d_bit; } }

Contributors

PersonTokensPropCommitsCommitProp
Willy Tarreau21195.05%133.33%
Dominique van den Broeck104.50%133.33%
Peter Hüwe10.45%133.33%
Total222100.00%3100.00%

/* * send a serial byte to the LCD panel. The caller is responsible for locking * if needed. */
static void lcd_send_serial(int byte) { int bit; /* * the data bit is set on D0, and the clock on STROBE. * LCD reads D0 on STROBE's rising edge. */ for (bit = 0; bit < 8; bit++) { clear_bit(LCD_BIT_CL, bits); /* CLK low */ panel_set_bits(); if (byte & 1) { set_bit(LCD_BIT_DA, bits); } else { clear_bit(LCD_BIT_DA, bits); } panel_set_bits(); udelay(2); /* maintain the data during 2 us before CLK up */ set_bit(LCD_BIT_CL, bits); /* CLK high */ panel_set_bits(); udelay(1); /* maintain the strobe during 1 us */ byte >>= 1; } }

Contributors

PersonTokensPropCommitsCommitProp
Willy Tarreau5962.77%125.00%
Daniel Chromik3132.98%125.00%
Sachin P. Sant33.19%125.00%
Alex Wilson11.06%125.00%
Total94100.00%4100.00%

/* turn the backlight on or off */
static void lcd_backlight(struct charlcd *charlcd, int on) { if (lcd.pins.bl == PIN_NONE) return; /* The backlight is activated by setting the AUTOFEED line to +5V */ spin_lock_irq(&pprt_lock); if (on) set_bit(LCD_BIT_BL, bits); else clear_bit(LCD_BIT_BL, bits); panel_set_bits(); spin_unlock_irq(&pprt_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Willy Tarreau2236.67%116.67%
Daniel Chromik1728.33%116.67%
Geert Uytterhoeven1728.33%116.67%
Fengguang Wu23.33%116.67%
Sachin P. Sant11.67%116.67%
Justin P. Mattock11.67%116.67%
Total60100.00%6100.00%

/* send a command to the LCD panel in serial mode */
static void lcd_write_cmd_s(struct charlcd *charlcd, int cmd) { spin_lock_irq(&pprt_lock); lcd_send_serial(0x1F); /* R/W=W, RS=0 */ lcd_send_serial(cmd & 0x0F); lcd_send_serial((cmd >> 4) & 0x0F); udelay(40); /* the shortest command takes at least 40 us */ spin_unlock_irq(&pprt_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Geert Uytterhoeven56100.00%2100.00%
Total56100.00%2100.00%

/* send data to the LCD panel in serial mode */
static void lcd_write_data_s(struct charlcd *charlcd, int data) { spin_lock_irq(&pprt_lock); lcd_send_serial(0x5F); /* R/W=W, RS=1 */ lcd_send_serial(data & 0x0F); lcd_send_serial((data >> 4) & 0x0F); udelay(40); /* the shortest data takes at least 40 us */ spin_unlock_irq(&pprt_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Willy Tarreau4173.21%120.00%
Geert Uytterhoeven1119.64%240.00%
Sudip Mukherjee23.57%120.00%
Fengguang Wu23.57%120.00%
Total56100.00%5100.00%

/* send a command to the LCD panel in 8 bits parallel mode */
static void lcd_write_cmd_p8(struct charlcd *charlcd, int cmd) { spin_lock_irq(&pprt_lock); /* present the data to the data port */ w_dtr(pprt, cmd); udelay(20); /* maintain the data during 20 us before the strobe */ set_bit(LCD_BIT_E, bits); clear_bit(LCD_BIT_RS, bits); clear_bit(LCD_BIT_RW, bits); set_ctrl_bits(); udelay(40); /* maintain the strobe during 40 us */ clear_bit(LCD_BIT_E, bits); set_ctrl_bits(); udelay(120);