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panel.c
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panel.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Front panel driver for Linux
* Copyright (C) 2000-2008, Willy Tarreau <[email protected]>
* Copyright (C) 2016-2017 Glider bvba
*
* 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 "charlcd.h"
#include "hd44780_common.h"
#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 */
char press_str[sizeof(void *) + sizeof(int)] __nonstring;
char repeat_str[sizeof(void *) + sizeof(int)] __nonstring;
char release_str[sizeof(void *) + sizeof(int)] __nonstring;
} 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_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];
}
}
/* 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;
}
/* 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;
}
/* sets ctrl & data port bits according to current signals values */
static void panel_set_bits(void)
{
set_data_bits();
set_ctrl_bits();
}
/*
* 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;
}
}
/*
* 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;
}
}
/* turn the backlight on or off */
static void lcd_backlight(struct charlcd *charlcd, enum charlcd_onoff 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);
}
/* send a command to the LCD panel in serial mode */
static void lcd_write_cmd_s(struct hd44780_common *hdc, 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);
}
/* send data to the LCD panel in serial mode */
static void lcd_write_data_s(struct hd44780_common *hdc, 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);
}
/* send a command to the LCD panel in 8 bits parallel mode */
static void lcd_write_cmd_p8(struct hd44780_common *hdc, 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); /* the shortest command takes at least 120 us */
spin_unlock_irq(&pprt_lock);
}
/* send data to the LCD panel in 8 bits parallel mode */
static void lcd_write_data_p8(struct hd44780_common *hdc, int data)
{
spin_lock_irq(&pprt_lock);
/* present the data to the data port */
w_dtr(pprt, data);
udelay(20); /* maintain the data during 20 us before the strobe */
set_bit(LCD_BIT_E, bits);
set_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(45); /* the shortest data takes at least 45 us */
spin_unlock_irq(&pprt_lock);
}
/* send a command to the TI LCD panel */
static void lcd_write_cmd_tilcd(struct hd44780_common *hdc, int cmd)
{
spin_lock_irq(&pprt_lock);
/* present the data to the control port */
w_ctr(pprt, cmd);
udelay(60);
spin_unlock_irq(&pprt_lock);
}
/* send data to the TI LCD panel */
static void lcd_write_data_tilcd(struct hd44780_common *hdc, int data)
{
spin_lock_irq(&pprt_lock);
/* present the data to the data port */
w_dtr(pprt, data);
udelay(60);
spin_unlock_irq(&pprt_lock);
}
static const struct charlcd_ops charlcd_ops = {
.backlight = lcd_backlight,
.print = hd44780_common_print,
.gotoxy = hd44780_common_gotoxy,
.home = hd44780_common_home,
.clear_display = hd44780_common_clear_display,
.init_display = hd44780_common_init_display,
.shift_cursor = hd44780_common_shift_cursor,
.shift_display = hd44780_common_shift_display,
.display = hd44780_common_display,
.cursor = hd44780_common_cursor,
.blink = hd44780_common_blink,
.fontsize = hd44780_common_fontsize,
.lines = hd44780_common_lines,
.redefine_char = hd44780_common_redefine_char,
};
/* initialize the LCD driver */
static void lcd_init(void)
{
struct charlcd *charlcd;
struct hd44780_common *hdc;
hdc = hd44780_common_alloc();
if (!hdc)
return;
charlcd = charlcd_alloc();
if (!charlcd) {
kfree(hdc);
return;
}
hdc->hd44780 = &lcd;
charlcd->drvdata = hdc;
/*
* Init lcd struct with load-time values to preserve exact
* current functionality (at least for now).
*/
charlcd->height = lcd_height;
charlcd->width = lcd_width;
hdc->bwidth = lcd_bwidth;
hdc->hwidth = lcd_hwidth;
switch (selected_lcd_type) {
case LCD_TYPE_OLD:
/* parallel mode, 8 bits */
lcd.proto = LCD_PROTO_PARALLEL;
lcd.charset = LCD_CHARSET_NORMAL;
lcd.pins.e = PIN_STROBE;
lcd.pins.rs = PIN_AUTOLF;
charlcd->width = 40;
hdc->bwidth = 40;
hdc->hwidth = 64;
charlcd->height = 2;
break;
case LCD_TYPE_KS0074:
/* serial mode, ks0074 */
lcd.proto = LCD_PROTO_SERIAL;
lcd.charset = LCD_CHARSET_KS0074;
lcd.pins.bl = PIN_AUTOLF;
lcd.pins.cl = PIN_STROBE;
lcd.pins.da = PIN_D0;
charlcd->width = 16;
hdc->bwidth = 40;
hdc->hwidth = 16;
charlcd->height = 2;
break;
case LCD_TYPE_NEXCOM:
/* parallel mode, 8 bits, generic */
lcd.proto = LCD_PROTO_PARALLEL;
lcd.charset = LCD_CHARSET_NORMAL;
lcd.pins.e = PIN_AUTOLF;
lcd.pins.rs = PIN_SELECP;
lcd.pins.rw = PIN_INITP;
charlcd->width = 16;
hdc->bwidth = 40;
hdc->hwidth = 64;
charlcd->height = 2;
break;
case LCD_TYPE_CUSTOM:
/* customer-defined */
lcd.proto = DEFAULT_LCD_PROTO;
lcd.charset = DEFAULT_LCD_CHARSET;
/* default geometry will be set later */
break;
case LCD_TYPE_HANTRONIX:
/* parallel mode, 8 bits, hantronix-like */
default:
lcd.proto = LCD_PROTO_PARALLEL;
lcd.charset = LCD_CHARSET_NORMAL;
lcd.pins.e = PIN_STROBE;
lcd.pins.rs = PIN_SELECP;
charlcd->width = 16;
hdc->bwidth = 40;
hdc->hwidth = 64;
charlcd->height = 2;
break;
}
/* Overwrite with module params set on loading */
if (lcd_height != NOT_SET)
charlcd->height = lcd_height;
if (lcd_width != NOT_SET)
charlcd->width = lcd_width;
if (lcd_bwidth != NOT_SET)
hdc->bwidth = lcd_bwidth;
if (lcd_hwidth != NOT_SET)
hdc->hwidth = lcd_hwidth;
if (lcd_charset != NOT_SET)
lcd.charset = lcd_charset;
if (lcd_proto != NOT_SET)
lcd.proto = lcd_proto;
if (lcd_e_pin != PIN_NOT_SET)
lcd.pins.e = lcd_e_pin;
if (lcd_rs_pin != PIN_NOT_SET)
lcd.pins.rs = lcd_rs_pin;
if (lcd_rw_pin != PIN_NOT_SET)
lcd.pins.rw = lcd_rw_pin;
if (lcd_cl_pin != PIN_NOT_SET)
lcd.pins.cl = lcd_cl_pin;
if (lcd_da_pin != PIN_NOT_SET)
lcd.pins.da = lcd_da_pin;
if (lcd_bl_pin != PIN_NOT_SET)
lcd.pins.bl = lcd_bl_pin;
/* this is used to catch wrong and default values */
if (charlcd->width <= 0)
charlcd->width = DEFAULT_LCD_WIDTH;
if (hdc->bwidth <= 0)
hdc->bwidth = DEFAULT_LCD_BWIDTH;
if (hdc->hwidth <= 0)
hdc->hwidth = DEFAULT_LCD_HWIDTH;
if (charlcd->height <= 0)
charlcd->height = DEFAULT_LCD_HEIGHT;
if (lcd.proto == LCD_PROTO_SERIAL) { /* SERIAL */
charlcd->ops = &charlcd_ops;
hdc->write_data = lcd_write_data_s;
hdc->write_cmd = lcd_write_cmd_s;
if (lcd.pins.cl == PIN_NOT_SET)
lcd.pins.cl = DEFAULT_LCD_PIN_SCL;
if (lcd.pins.da == PIN_NOT_SET)
lcd.pins.da = DEFAULT_LCD_PIN_SDA;
} else if (lcd.proto == LCD_PROTO_PARALLEL) { /* PARALLEL */
charlcd->ops = &charlcd_ops;
hdc->write_data = lcd_write_data_p8;
hdc->write_cmd = lcd_write_cmd_p8;
if (lcd.pins.e == PIN_NOT_SET)
lcd.pins.e = DEFAULT_LCD_PIN_E;
if (lcd.pins.rs == PIN_NOT_SET)
lcd.pins.rs = DEFAULT_LCD_PIN_RS;
if (lcd.pins.rw == PIN_NOT_SET)
lcd.pins.rw = DEFAULT_LCD_PIN_RW;
} else {
charlcd->ops = &charlcd_ops;
hdc->write_data = lcd_write_data_tilcd;
hdc->write_cmd = lcd_write_cmd_tilcd;
}
if (lcd.pins.bl == PIN_NOT_SET)
lcd.pins.bl = DEFAULT_LCD_PIN_BL;
if (lcd.pins.e == PIN_NOT_SET)
lcd.pins.e = PIN_NONE;
if (lcd.pins.rs == PIN_NOT_SET)
lcd.pins.rs = PIN_NONE;
if (lcd.pins.rw == PIN_NOT_SET)
lcd.pins.rw = PIN_NONE;
if (lcd.pins.bl == PIN_NOT_SET)
lcd.pins.bl = PIN_NONE;
if (lcd.pins.cl == PIN_NOT_SET)
lcd.pins.cl = PIN_NONE;
if (lcd.pins.da == PIN_NOT_SET)
lcd.pins.da = PIN_NONE;
if (lcd.charset == NOT_SET)
lcd.charset = DEFAULT_LCD_CHARSET;
if (lcd.charset == LCD_CHARSET_KS0074)
charlcd->char_conv = lcd_char_conv_ks0074;
else