#include <linux/atomic.h>
#include <linux/ctype.h>
-#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include "charlcd.h"
-#define DEFAULT_LCD_BWIDTH 40
-#define DEFAULT_LCD_HWIDTH 64
-
/* Keep the backlight on this many seconds for each flash */
#define LCD_BL_TEMPO_PERIOD 4
-#define LCD_FLAG_B 0x0004 /* Blink on */
-#define LCD_FLAG_C 0x0008 /* Cursor on */
-#define LCD_FLAG_D 0x0010 /* Display on */
-#define LCD_FLAG_F 0x0020 /* Large font mode */
-#define LCD_FLAG_N 0x0040 /* 2-rows mode */
-#define LCD_FLAG_L 0x0080 /* Backlight enabled */
-
-/* LCD commands */
-#define LCD_CMD_DISPLAY_CLEAR 0x01 /* Clear entire display */
-
-#define LCD_CMD_ENTRY_MODE 0x04 /* Set entry mode */
-#define LCD_CMD_CURSOR_INC 0x02 /* Increment cursor */
-
-#define LCD_CMD_DISPLAY_CTRL 0x08 /* Display control */
-#define LCD_CMD_DISPLAY_ON 0x04 /* Set display on */
-#define LCD_CMD_CURSOR_ON 0x02 /* Set cursor on */
-#define LCD_CMD_BLINK_ON 0x01 /* Set blink on */
-
-#define LCD_CMD_SHIFT 0x10 /* Shift cursor/display */
-#define LCD_CMD_DISPLAY_SHIFT 0x08 /* Shift display instead of cursor */
-#define LCD_CMD_SHIFT_RIGHT 0x04 /* Shift display/cursor to the right */
-
-#define LCD_CMD_FUNCTION_SET 0x20 /* Set function */
-#define LCD_CMD_DATA_LEN_8BITS 0x10 /* Set data length to 8 bits */
-#define LCD_CMD_TWO_LINES 0x08 /* Set to two display lines */
-#define LCD_CMD_FONT_5X10_DOTS 0x04 /* Set char font to 5x10 dots */
-
-#define LCD_CMD_SET_CGRAM_ADDR 0x40 /* Set char generator RAM address */
-
-#define LCD_CMD_SET_DDRAM_ADDR 0x80 /* Set display data RAM address */
-
#define LCD_ESCAPE_LEN 24 /* Max chars for LCD escape command */
#define LCD_ESCAPE_CHAR 27 /* Use char 27 for escape command */
/* contains the LCD config state */
unsigned long int flags;
- /* Contains the LCD X and Y offset */
- struct {
- unsigned long int x;
- unsigned long int y;
- } addr;
-
/* Current escape sequence and it's length or -1 if outside */
struct {
char buf[LCD_ESCAPE_LEN + 1];
/* Device single-open policy control */
static atomic_t charlcd_available = ATOMIC_INIT(1);
-/* sleeps that many milliseconds with a reschedule */
-static void long_sleep(int ms)
-{
- schedule_timeout_interruptible(msecs_to_jiffies(ms));
-}
-
/* turn the backlight on or off */
-static void charlcd_backlight(struct charlcd *lcd, int on)
+void charlcd_backlight(struct charlcd *lcd, enum charlcd_onoff on)
{
struct charlcd_priv *priv = charlcd_to_priv(lcd);
lcd->ops->backlight(lcd, on);
mutex_unlock(&priv->bl_tempo_lock);
}
+EXPORT_SYMBOL_GPL(charlcd_backlight);
static void charlcd_bl_off(struct work_struct *work)
{
if (priv->bl_tempo) {
priv->bl_tempo = false;
if (!(priv->flags & LCD_FLAG_L))
- priv->lcd.ops->backlight(&priv->lcd, 0);
+ priv->lcd.ops->backlight(&priv->lcd, CHARLCD_OFF);
}
mutex_unlock(&priv->bl_tempo_lock);
}
mutex_lock(&priv->bl_tempo_lock);
if (!priv->bl_tempo && !(priv->flags & LCD_FLAG_L))
- lcd->ops->backlight(lcd, 1);
+ lcd->ops->backlight(lcd, CHARLCD_ON);
priv->bl_tempo = true;
schedule_delayed_work(&priv->bl_work, LCD_BL_TEMPO_PERIOD * HZ);
mutex_unlock(&priv->bl_tempo_lock);
}
EXPORT_SYMBOL_GPL(charlcd_poke);
-static void charlcd_gotoxy(struct charlcd *lcd)
-{
- struct charlcd_priv *priv = charlcd_to_priv(lcd);
- unsigned int addr;
-
- /*
- * we force the cursor to stay at the end of the
- * line if it wants to go farther
- */
- addr = priv->addr.x < lcd->bwidth ? priv->addr.x & (lcd->hwidth - 1)
- : lcd->bwidth - 1;
- if (priv->addr.y & 1)
- addr += lcd->hwidth;
- if (priv->addr.y & 2)
- addr += lcd->bwidth;
- lcd->ops->write_cmd(lcd, LCD_CMD_SET_DDRAM_ADDR | addr);
-}
-
static void charlcd_home(struct charlcd *lcd)
{
- struct charlcd_priv *priv = charlcd_to_priv(lcd);
-
- priv->addr.x = 0;
- priv->addr.y = 0;
- charlcd_gotoxy(lcd);
+ lcd->addr.x = 0;
+ lcd->addr.y = 0;
+ lcd->ops->home(lcd);
}
static void charlcd_print(struct charlcd *lcd, char c)
{
- struct charlcd_priv *priv = charlcd_to_priv(lcd);
-
- if (priv->addr.x < lcd->bwidth) {
- if (lcd->char_conv)
- c = lcd->char_conv[(unsigned char)c];
- lcd->ops->write_data(lcd, c);
- priv->addr.x++;
-
- /* prevents the cursor from wrapping onto the next line */
- if (priv->addr.x == lcd->bwidth)
- charlcd_gotoxy(lcd);
- }
-}
-
-static void charlcd_clear_fast(struct charlcd *lcd)
-{
- int pos;
+ if (lcd->addr.x >= lcd->width)
+ return;
- charlcd_home(lcd);
+ if (lcd->char_conv)
+ c = lcd->char_conv[(unsigned char)c];
- if (lcd->ops->clear_fast)
- lcd->ops->clear_fast(lcd);
- else
- for (pos = 0; pos < min(2, lcd->height) * lcd->hwidth; pos++)
- lcd->ops->write_data(lcd, ' ');
+ if (!lcd->ops->print(lcd, c))
+ lcd->addr.x++;
- charlcd_home(lcd);
+ /* prevents the cursor from wrapping onto the next line */
+ if (lcd->addr.x == lcd->width)
+ lcd->ops->gotoxy(lcd, lcd->addr.x - 1, lcd->addr.y);
}
-/* clears the display and resets X/Y */
static void charlcd_clear_display(struct charlcd *lcd)
{
- struct charlcd_priv *priv = charlcd_to_priv(lcd);
-
- lcd->ops->write_cmd(lcd, LCD_CMD_DISPLAY_CLEAR);
- priv->addr.x = 0;
- priv->addr.y = 0;
- /* we must wait a few milliseconds (15) */
- long_sleep(15);
-}
-
-static int charlcd_init_display(struct charlcd *lcd)
-{
- void (*write_cmd_raw)(struct charlcd *lcd, int cmd);
- struct charlcd_priv *priv = charlcd_to_priv(lcd);
- u8 init;
-
- if (lcd->ifwidth != 4 && lcd->ifwidth != 8)
- return -EINVAL;
-
- priv->flags = ((lcd->height > 1) ? LCD_FLAG_N : 0) | LCD_FLAG_D |
- LCD_FLAG_C | LCD_FLAG_B;
-
- long_sleep(20); /* wait 20 ms after power-up for the paranoid */
-
- /*
- * 8-bit mode, 1 line, small fonts; let's do it 3 times, to make sure
- * the LCD is in 8-bit mode afterwards
- */
- init = LCD_CMD_FUNCTION_SET | LCD_CMD_DATA_LEN_8BITS;
- if (lcd->ifwidth == 4) {
- init >>= 4;
- write_cmd_raw = lcd->ops->write_cmd_raw4;
- } else {
- write_cmd_raw = lcd->ops->write_cmd;
- }
- write_cmd_raw(lcd, init);
- long_sleep(10);
- write_cmd_raw(lcd, init);
- long_sleep(10);
- write_cmd_raw(lcd, init);
- long_sleep(10);
-
- if (lcd->ifwidth == 4) {
- /* Switch to 4-bit mode, 1 line, small fonts */
- lcd->ops->write_cmd_raw4(lcd, LCD_CMD_FUNCTION_SET >> 4);
- long_sleep(10);
- }
-
- /* set font height and lines number */
- lcd->ops->write_cmd(lcd,
- LCD_CMD_FUNCTION_SET |
- ((lcd->ifwidth == 8) ? LCD_CMD_DATA_LEN_8BITS : 0) |
- ((priv->flags & LCD_FLAG_F) ? LCD_CMD_FONT_5X10_DOTS : 0) |
- ((priv->flags & LCD_FLAG_N) ? LCD_CMD_TWO_LINES : 0));
- long_sleep(10);
-
- /* display off, cursor off, blink off */
- lcd->ops->write_cmd(lcd, LCD_CMD_DISPLAY_CTRL);
- long_sleep(10);
-
- lcd->ops->write_cmd(lcd,
- LCD_CMD_DISPLAY_CTRL | /* set display mode */
- ((priv->flags & LCD_FLAG_D) ? LCD_CMD_DISPLAY_ON : 0) |
- ((priv->flags & LCD_FLAG_C) ? LCD_CMD_CURSOR_ON : 0) |
- ((priv->flags & LCD_FLAG_B) ? LCD_CMD_BLINK_ON : 0));
-
- charlcd_backlight(lcd, (priv->flags & LCD_FLAG_L) ? 1 : 0);
-
- long_sleep(10);
-
- /* entry mode set : increment, cursor shifting */
- lcd->ops->write_cmd(lcd, LCD_CMD_ENTRY_MODE | LCD_CMD_CURSOR_INC);
-
- charlcd_clear_display(lcd);
- return 0;
+ lcd->ops->clear_display(lcd);
+ lcd->addr.x = 0;
+ lcd->addr.y = 0;
}
/*
switch (*esc) {
case 'D': /* Display ON */
priv->flags |= LCD_FLAG_D;
+ if (priv->flags != oldflags)
+ lcd->ops->display(lcd, CHARLCD_ON);
+
processed = 1;
break;
case 'd': /* Display OFF */
priv->flags &= ~LCD_FLAG_D;
+ if (priv->flags != oldflags)
+ lcd->ops->display(lcd, CHARLCD_OFF);
+
processed = 1;
break;
case 'C': /* Cursor ON */
priv->flags |= LCD_FLAG_C;
+ if (priv->flags != oldflags)
+ lcd->ops->cursor(lcd, CHARLCD_ON);
+
processed = 1;
break;
case 'c': /* Cursor OFF */
priv->flags &= ~LCD_FLAG_C;
+ if (priv->flags != oldflags)
+ lcd->ops->cursor(lcd, CHARLCD_OFF);
+
processed = 1;
break;
case 'B': /* Blink ON */
priv->flags |= LCD_FLAG_B;
+ if (priv->flags != oldflags)
+ lcd->ops->blink(lcd, CHARLCD_ON);
+
processed = 1;
break;
case 'b': /* Blink OFF */
priv->flags &= ~LCD_FLAG_B;
+ if (priv->flags != oldflags)
+ lcd->ops->blink(lcd, CHARLCD_OFF);
+
processed = 1;
break;
case '+': /* Back light ON */
priv->flags |= LCD_FLAG_L;
+ if (priv->flags != oldflags)
+ charlcd_backlight(lcd, CHARLCD_ON);
+
processed = 1;
break;
case '-': /* Back light OFF */
priv->flags &= ~LCD_FLAG_L;
+ if (priv->flags != oldflags)
+ charlcd_backlight(lcd, CHARLCD_OFF);
+
processed = 1;
break;
case '*': /* Flash back light */
break;
case 'f': /* Small Font */
priv->flags &= ~LCD_FLAG_F;
+ if (priv->flags != oldflags)
+ lcd->ops->fontsize(lcd, CHARLCD_FONTSIZE_SMALL);
+
processed = 1;
break;
case 'F': /* Large Font */
priv->flags |= LCD_FLAG_F;
+ if (priv->flags != oldflags)
+ lcd->ops->fontsize(lcd, CHARLCD_FONTSIZE_LARGE);
+
processed = 1;
break;
case 'n': /* One Line */
priv->flags &= ~LCD_FLAG_N;
+ if (priv->flags != oldflags)
+ lcd->ops->lines(lcd, CHARLCD_LINES_1);
+
processed = 1;
break;
case 'N': /* Two Lines */
priv->flags |= LCD_FLAG_N;
+ if (priv->flags != oldflags)
+ lcd->ops->lines(lcd, CHARLCD_LINES_2);
+
processed = 1;
break;
case 'l': /* Shift Cursor Left */
- if (priv->addr.x > 0) {
- /* back one char if not at end of line */
- if (priv->addr.x < lcd->bwidth)
- lcd->ops->write_cmd(lcd, LCD_CMD_SHIFT);
- priv->addr.x--;
+ if (lcd->addr.x > 0) {
+ if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_LEFT))
+ lcd->addr.x--;
}
+
processed = 1;
break;
case 'r': /* shift cursor right */
- if (priv->addr.x < lcd->width) {
- /* allow the cursor to pass the end of the line */
- if (priv->addr.x < (lcd->bwidth - 1))
- lcd->ops->write_cmd(lcd,
- LCD_CMD_SHIFT | LCD_CMD_SHIFT_RIGHT);
- priv->addr.x++;
+ if (lcd->addr.x < lcd->width) {
+ if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_RIGHT))
+ lcd->addr.x++;
}
+
processed = 1;
break;
case 'L': /* shift display left */
- lcd->ops->write_cmd(lcd, LCD_CMD_SHIFT | LCD_CMD_DISPLAY_SHIFT);
+ lcd->ops->shift_display(lcd, CHARLCD_SHIFT_LEFT);
processed = 1;
break;
case 'R': /* shift display right */
- lcd->ops->write_cmd(lcd,
- LCD_CMD_SHIFT | LCD_CMD_DISPLAY_SHIFT |
- LCD_CMD_SHIFT_RIGHT);
+ lcd->ops->shift_display(lcd, CHARLCD_SHIFT_RIGHT);
processed = 1;
break;
case 'k': { /* kill end of line */
- int x;
+ int x, xs, ys;
- for (x = priv->addr.x; x < lcd->bwidth; x++)
- lcd->ops->write_data(lcd, ' ');
+ xs = lcd->addr.x;
+ ys = lcd->addr.y;
+ for (x = lcd->addr.x; x < lcd->width; x++)
+ lcd->ops->print(lcd, ' ');
/* restore cursor position */
- charlcd_gotoxy(lcd);
+ lcd->addr.x = xs;
+ lcd->addr.y = ys;
+ lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);
processed = 1;
break;
}
case 'I': /* reinitialize display */
- charlcd_init_display(lcd);
+ lcd->ops->init_display(lcd);
+ priv->flags = ((lcd->height > 1) ? LCD_FLAG_N : 0) | LCD_FLAG_D |
+ LCD_FLAG_C | LCD_FLAG_B;
processed = 1;
break;
- case 'G': {
- /* Generator : LGcxxxxx...xx; must have <c> between '0'
- * and '7', representing the numerical ASCII code of the
- * redefined character, and <xx...xx> a sequence of 16
- * hex digits representing 8 bytes for each character.
- * Most LCDs will only use 5 lower bits of the 7 first
- * bytes.
- */
-
- unsigned char cgbytes[8];
- unsigned char cgaddr;
- int cgoffset;
- int shift;
- char value;
- int addr;
-
- if (!strchr(esc, ';'))
- break;
-
- esc++;
-
- cgaddr = *(esc++) - '0';
- if (cgaddr > 7) {
+ case 'G':
+ if (lcd->ops->redefine_char)
+ processed = lcd->ops->redefine_char(lcd, esc);
+ else
processed = 1;
- break;
- }
-
- cgoffset = 0;
- shift = 0;
- value = 0;
- while (*esc && cgoffset < 8) {
- int half;
-
- shift ^= 4;
-
- half = hex_to_bin(*esc++);
- if (half < 0)
- continue;
-
- value |= half << shift;
- if (shift == 0) {
- cgbytes[cgoffset++] = value;
- value = 0;
- }
- }
-
- lcd->ops->write_cmd(lcd, LCD_CMD_SET_CGRAM_ADDR | (cgaddr * 8));
- for (addr = 0; addr < cgoffset; addr++)
- lcd->ops->write_data(lcd, cgbytes[addr]);
-
- /* ensures that we stop writing to CGRAM */
- charlcd_gotoxy(lcd);
- processed = 1;
break;
- }
+
case 'x': /* gotoxy : LxXXX[yYYY]; */
case 'y': /* gotoxy : LyYYY[xXXX]; */
if (priv->esc_seq.buf[priv->esc_seq.len - 1] != ';')
break;
/* If the command is valid, move to the new address */
- if (parse_xy(esc, &priv->addr.x, &priv->addr.y))
- charlcd_gotoxy(lcd);
+ if (parse_xy(esc, &lcd->addr.x, &lcd->addr.y))
+ lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);
/* Regardless of its validity, mark as processed */
processed = 1;
break;
}
- /* TODO: This indent party here got ugly, clean it! */
- /* Check whether one flag was changed */
- if (oldflags == priv->flags)
- return processed;
-
- /* check whether one of B,C,D flags were changed */
- if ((oldflags ^ priv->flags) &
- (LCD_FLAG_B | LCD_FLAG_C | LCD_FLAG_D))
- /* set display mode */
- lcd->ops->write_cmd(lcd,
- LCD_CMD_DISPLAY_CTRL |
- ((priv->flags & LCD_FLAG_D) ? LCD_CMD_DISPLAY_ON : 0) |
- ((priv->flags & LCD_FLAG_C) ? LCD_CMD_CURSOR_ON : 0) |
- ((priv->flags & LCD_FLAG_B) ? LCD_CMD_BLINK_ON : 0));
- /* check whether one of F,N flags was changed */
- else if ((oldflags ^ priv->flags) & (LCD_FLAG_F | LCD_FLAG_N))
- lcd->ops->write_cmd(lcd,
- LCD_CMD_FUNCTION_SET |
- ((lcd->ifwidth == 8) ? LCD_CMD_DATA_LEN_8BITS : 0) |
- ((priv->flags & LCD_FLAG_F) ? LCD_CMD_FONT_5X10_DOTS : 0) |
- ((priv->flags & LCD_FLAG_N) ? LCD_CMD_TWO_LINES : 0));
- /* check whether L flag was changed */
- else if ((oldflags ^ priv->flags) & LCD_FLAG_L)
- charlcd_backlight(lcd, !!(priv->flags & LCD_FLAG_L));
-
return processed;
}
break;
case '\b':
/* go back one char and clear it */
- if (priv->addr.x > 0) {
- /*
- * check if we're not at the
- * end of the line
- */
- if (priv->addr.x < lcd->bwidth)
- /* back one char */
- lcd->ops->write_cmd(lcd, LCD_CMD_SHIFT);
- priv->addr.x--;
+ if (lcd->addr.x > 0) {
+ /* back one char */
+ if (!lcd->ops->shift_cursor(lcd,
+ CHARLCD_SHIFT_LEFT))
+ lcd->addr.x--;
}
/* replace with a space */
- lcd->ops->write_data(lcd, ' ');
+ charlcd_print(lcd, ' ');
/* back one char again */
- lcd->ops->write_cmd(lcd, LCD_CMD_SHIFT);
+ if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_LEFT))
+ lcd->addr.x--;
+
break;
case '\f':
/* quickly clear the display */
- charlcd_clear_fast(lcd);
+ charlcd_clear_display(lcd);
break;
case '\n':
/*
* flush the remainder of the current line and
* go to the beginning of the next line
*/
- for (; priv->addr.x < lcd->bwidth; priv->addr.x++)
- lcd->ops->write_data(lcd, ' ');
- priv->addr.x = 0;
- priv->addr.y = (priv->addr.y + 1) % lcd->height;
- charlcd_gotoxy(lcd);
+ for (; lcd->addr.x < lcd->width; lcd->addr.x++)
+ lcd->ops->print(lcd, ' ');
+
+ lcd->addr.x = 0;
+ lcd->addr.y = (lcd->addr.y + 1) % lcd->height;
+ lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);
break;
case '\r':
/* go to the beginning of the same line */
- priv->addr.x = 0;
- charlcd_gotoxy(lcd);
+ lcd->addr.x = 0;
+ lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);
break;
case '\t':
/* print a space instead of the tab */
if (!strcmp(priv->esc_seq.buf, "[2J")) {
/* clear the display */
- charlcd_clear_fast(lcd);
+ charlcd_clear_display(lcd);
processed = 1;
} else if (!strcmp(priv->esc_seq.buf, "[H")) {
/* cursor to home */
goto fail;
if (priv->must_clear) {
- charlcd_clear_display(&priv->lcd);
+ priv->lcd.ops->clear_display(&priv->lcd);
priv->must_clear = false;
+ priv->lcd.addr.x = 0;
+ priv->lcd.addr.y = 0;
}
return nonseekable_open(inode, file);
struct charlcd_priv *priv = charlcd_to_priv(lcd);
int ret;
+ priv->flags = ((lcd->height > 1) ? LCD_FLAG_N : 0) | LCD_FLAG_D |
+ LCD_FLAG_C | LCD_FLAG_B;
if (lcd->ops->backlight) {
mutex_init(&priv->bl_tempo_lock);
INIT_DELAYED_WORK(&priv->bl_work, charlcd_bl_off);
* Since charlcd_init_display() needs to write data, we have to
* enable mark the LCD initialized just before.
*/
- ret = charlcd_init_display(lcd);
+ ret = lcd->ops->init_display(lcd);
if (ret)
return ret;
return 0;
}
-struct charlcd *charlcd_alloc(unsigned int drvdata_size)
+struct charlcd *charlcd_alloc(void)
{
struct charlcd_priv *priv;
struct charlcd *lcd;
- priv = kzalloc(sizeof(*priv) + drvdata_size, GFP_KERNEL);
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return NULL;
priv->esc_seq.len = -1;
lcd = &priv->lcd;
- lcd->ifwidth = 8;
- lcd->bwidth = DEFAULT_LCD_BWIDTH;
- lcd->hwidth = DEFAULT_LCD_HWIDTH;
- lcd->drvdata = priv->drvdata;
return lcd;
}
the_charlcd = NULL;
if (lcd->ops->backlight) {
cancel_delayed_work_sync(&priv->bl_work);
- priv->lcd.ops->backlight(&priv->lcd, 0);
+ priv->lcd.ops->backlight(&priv->lcd, CHARLCD_OFF);
}
return 0;
projects / linux-2.6-microblaze.git / blobdiff