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staging: panel: Move LCD-related state into struct lcd
Move more or less all LCD-related state into struct lcd in order to get better cohesion; use bool instead of int where it makes sense. Signed-off-by: Mariusz Gorski <marius.gorski@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mariusz Gorski
Greg Kroah-Hartman
parent
1a4b2e3e6c
commit
6d8b588c32
@ -225,12 +225,20 @@ static wait_queue_head_t keypad_read_wait;
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/* lcd-specific variables */
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static struct {
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bool enabled;
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bool initialized;
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bool must_clear;
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/* TODO: use bool here? */
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char left_shift;
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int height;
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int width;
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int bwidth;
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int hwidth;
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int charset;
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int proto;
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int light_tempo;
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/* TODO: use union here? */
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struct {
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int e;
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@ -240,22 +248,26 @@ static struct {
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int da;
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int bl;
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} pins;
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/* contains the LCD config state */
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unsigned long int flags;
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/* Contains the LCD X and Y offset */
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struct {
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unsigned long int x;
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unsigned long int y;
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} addr;
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/* Current escape sequence and it's length or -1 if outside */
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struct {
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char buf[LCD_ESCAPE_LEN + 1];
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int len;
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} esc_seq;
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} lcd;
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/* Needed only for init */
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static int selected_lcd_type = NOT_SET;
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/* contains the LCD config state */
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static unsigned long int lcd_flags;
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/* contains the LCD X offset */
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static unsigned long int lcd_addr_x;
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/* contains the LCD Y offset */
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static unsigned long int lcd_addr_y;
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/* current escape sequence, 0 terminated */
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static char lcd_escape[LCD_ESCAPE_LEN + 1];
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/* not in escape state. >=0 = escape cmd len */
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static int lcd_escape_len = -1;
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/*
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* Bit masks to convert LCD signals to parallel port outputs.
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* _d_ are values for data port, _c_ are for control port.
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@ -438,13 +450,8 @@ static atomic_t keypad_available = ATOMIC_INIT(1);
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static struct pardevice *pprt;
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static int lcd_initialized;
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static int keypad_initialized;
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static int light_tempo;
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static char lcd_must_clear;
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static char lcd_left_shift;
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static char init_in_progress;
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static void (*lcd_write_cmd)(int);
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@ -880,23 +887,23 @@ static void lcd_write_data_tilcd(int data)
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static void lcd_gotoxy(void)
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{
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lcd_write_cmd(0x80 /* set DDRAM address */
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| (lcd_addr_y ? lcd.hwidth : 0)
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| (lcd.addr.y ? lcd.hwidth : 0)
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/* we force the cursor to stay at the end of the
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line if it wants to go farther */
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| ((lcd_addr_x < lcd.bwidth) ? lcd_addr_x &
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| ((lcd.addr.x < lcd.bwidth) ? lcd.addr.x &
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(lcd.hwidth - 1) : lcd.bwidth - 1));
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}
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static void lcd_print(char c)
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{
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if (lcd_addr_x < lcd.bwidth) {
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if (lcd.addr.x < lcd.bwidth) {
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if (lcd_char_conv != NULL)
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c = lcd_char_conv[(unsigned char)c];
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lcd_write_data(c);
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lcd_addr_x++;
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lcd.addr.x++;
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}
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/* prevents the cursor from wrapping onto the next line */
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if (lcd_addr_x == lcd.bwidth)
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if (lcd.addr.x == lcd.bwidth)
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lcd_gotoxy();
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}
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@ -905,8 +912,8 @@ static void lcd_clear_fast_s(void)
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{
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int pos;
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lcd_addr_x = 0;
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lcd_addr_y = 0;
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lcd.addr.x = 0;
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lcd.addr.y = 0;
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lcd_gotoxy();
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spin_lock_irq(&pprt_lock);
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@ -918,8 +925,8 @@ static void lcd_clear_fast_s(void)
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}
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spin_unlock_irq(&pprt_lock);
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lcd_addr_x = 0;
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lcd_addr_y = 0;
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lcd.addr.x = 0;
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lcd.addr.y = 0;
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lcd_gotoxy();
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}
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@ -928,8 +935,8 @@ static void lcd_clear_fast_p8(void)
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{
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int pos;
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lcd_addr_x = 0;
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lcd_addr_y = 0;
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lcd.addr.x = 0;
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lcd.addr.y = 0;
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lcd_gotoxy();
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spin_lock_irq(&pprt_lock);
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@ -956,8 +963,8 @@ static void lcd_clear_fast_p8(void)
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}
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spin_unlock_irq(&pprt_lock);
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lcd_addr_x = 0;
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lcd_addr_y = 0;
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lcd.addr.x = 0;
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lcd.addr.y = 0;
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lcd_gotoxy();
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}
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@ -966,8 +973,8 @@ static void lcd_clear_fast_tilcd(void)
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{
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int pos;
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lcd_addr_x = 0;
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lcd_addr_y = 0;
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lcd.addr.x = 0;
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lcd.addr.y = 0;
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lcd_gotoxy();
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spin_lock_irq(&pprt_lock);
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@ -979,8 +986,8 @@ static void lcd_clear_fast_tilcd(void)
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spin_unlock_irq(&pprt_lock);
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lcd_addr_x = 0;
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lcd_addr_y = 0;
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lcd.addr.x = 0;
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lcd.addr.y = 0;
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lcd_gotoxy();
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}
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@ -988,15 +995,15 @@ static void lcd_clear_fast_tilcd(void)
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static void lcd_clear_display(void)
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{
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lcd_write_cmd(0x01); /* clear display */
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lcd_addr_x = 0;
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lcd_addr_y = 0;
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lcd.addr.x = 0;
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lcd.addr.y = 0;
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/* we must wait a few milliseconds (15) */
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long_sleep(15);
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}
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static void lcd_init_display(void)
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{
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lcd_flags = ((lcd.height > 1) ? LCD_FLAG_N : 0)
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lcd.flags = ((lcd.height > 1) ? LCD_FLAG_N : 0)
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| LCD_FLAG_D | LCD_FLAG_C | LCD_FLAG_B;
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long_sleep(20); /* wait 20 ms after power-up for the paranoid */
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@ -1009,8 +1016,8 @@ static void lcd_init_display(void)
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long_sleep(10);
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lcd_write_cmd(0x30 /* set font height and lines number */
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| ((lcd_flags & LCD_FLAG_F) ? 4 : 0)
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| ((lcd_flags & LCD_FLAG_N) ? 8 : 0)
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| ((lcd.flags & LCD_FLAG_F) ? 4 : 0)
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| ((lcd.flags & LCD_FLAG_N) ? 8 : 0)
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);
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long_sleep(10);
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@ -1018,12 +1025,12 @@ static void lcd_init_display(void)
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long_sleep(10);
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lcd_write_cmd(0x08 /* set display mode */
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| ((lcd_flags & LCD_FLAG_D) ? 4 : 0)
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| ((lcd_flags & LCD_FLAG_C) ? 2 : 0)
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| ((lcd_flags & LCD_FLAG_B) ? 1 : 0)
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| ((lcd.flags & LCD_FLAG_D) ? 4 : 0)
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| ((lcd.flags & LCD_FLAG_C) ? 2 : 0)
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| ((lcd.flags & LCD_FLAG_B) ? 1 : 0)
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);
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lcd_backlight((lcd_flags & LCD_FLAG_L) ? 1 : 0);
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lcd_backlight((lcd.flags & LCD_FLAG_L) ? 1 : 0);
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long_sleep(10);
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@ -1046,100 +1053,101 @@ static inline int handle_lcd_special_code(void)
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int processed = 0;
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char *esc = lcd_escape + 2;
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int oldflags = lcd_flags;
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char *esc = lcd.esc_seq.buf + 2;
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int oldflags = lcd.flags;
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/* check for display mode flags */
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switch (*esc) {
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case 'D': /* Display ON */
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lcd_flags |= LCD_FLAG_D;
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lcd.flags |= LCD_FLAG_D;
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processed = 1;
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break;
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case 'd': /* Display OFF */
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lcd_flags &= ~LCD_FLAG_D;
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lcd.flags &= ~LCD_FLAG_D;
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processed = 1;
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break;
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case 'C': /* Cursor ON */
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lcd_flags |= LCD_FLAG_C;
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lcd.flags |= LCD_FLAG_C;
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processed = 1;
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break;
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case 'c': /* Cursor OFF */
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lcd_flags &= ~LCD_FLAG_C;
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lcd.flags &= ~LCD_FLAG_C;
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processed = 1;
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break;
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case 'B': /* Blink ON */
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lcd_flags |= LCD_FLAG_B;
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lcd.flags |= LCD_FLAG_B;
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processed = 1;
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break;
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case 'b': /* Blink OFF */
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lcd_flags &= ~LCD_FLAG_B;
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lcd.flags &= ~LCD_FLAG_B;
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processed = 1;
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break;
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case '+': /* Back light ON */
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lcd_flags |= LCD_FLAG_L;
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lcd.flags |= LCD_FLAG_L;
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processed = 1;
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break;
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case '-': /* Back light OFF */
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lcd_flags &= ~LCD_FLAG_L;
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lcd.flags &= ~LCD_FLAG_L;
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processed = 1;
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break;
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case '*':
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/* flash back light using the keypad timer */
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if (scan_timer.function != NULL) {
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if (light_tempo == 0 && ((lcd_flags & LCD_FLAG_L) == 0))
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if (lcd.light_tempo == 0
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&& ((lcd.flags & LCD_FLAG_L) == 0))
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lcd_backlight(1);
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light_tempo = FLASH_LIGHT_TEMPO;
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lcd.light_tempo = FLASH_LIGHT_TEMPO;
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}
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processed = 1;
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break;
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case 'f': /* Small Font */
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lcd_flags &= ~LCD_FLAG_F;
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lcd.flags &= ~LCD_FLAG_F;
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processed = 1;
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break;
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case 'F': /* Large Font */
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lcd_flags |= LCD_FLAG_F;
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lcd.flags |= LCD_FLAG_F;
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processed = 1;
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break;
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case 'n': /* One Line */
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lcd_flags &= ~LCD_FLAG_N;
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lcd.flags &= ~LCD_FLAG_N;
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processed = 1;
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break;
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case 'N': /* Two Lines */
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lcd_flags |= LCD_FLAG_N;
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lcd.flags |= LCD_FLAG_N;
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break;
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case 'l': /* Shift Cursor Left */
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if (lcd_addr_x > 0) {
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if (lcd.addr.x > 0) {
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/* back one char if not at end of line */
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if (lcd_addr_x < lcd.bwidth)
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if (lcd.addr.x < lcd.bwidth)
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lcd_write_cmd(0x10);
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lcd_addr_x--;
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lcd.addr.x--;
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}
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processed = 1;
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break;
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case 'r': /* shift cursor right */
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if (lcd_addr_x < lcd.width) {
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if (lcd.addr.x < lcd.width) {
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/* allow the cursor to pass the end of the line */
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if (lcd_addr_x <
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if (lcd.addr.x <
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(lcd.bwidth - 1))
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lcd_write_cmd(0x14);
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lcd_addr_x++;
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lcd.addr.x++;
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}
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processed = 1;
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break;
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case 'L': /* shift display left */
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lcd_left_shift++;
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lcd.left_shift++;
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lcd_write_cmd(0x18);
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processed = 1;
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break;
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case 'R': /* shift display right */
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lcd_left_shift--;
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lcd.left_shift--;
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lcd_write_cmd(0x1C);
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processed = 1;
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break;
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case 'k': { /* kill end of line */
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int x;
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for (x = lcd_addr_x; x < lcd.bwidth; x++)
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for (x = lcd.addr.x; x < lcd.bwidth; x++)
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lcd_write_data(' ');
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/* restore cursor position */
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@ -1149,7 +1157,7 @@ static inline int handle_lcd_special_code(void)
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}
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case 'I': /* reinitialize display */
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lcd_init_display();
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lcd_left_shift = 0;
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lcd.left_shift = 0;
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processed = 1;
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break;
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case 'G': {
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@ -1220,11 +1228,11 @@ static inline int handle_lcd_special_code(void)
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while (*esc) {
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if (*esc == 'x') {
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esc++;
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if (kstrtoul(esc, 10, &lcd_addr_x) < 0)
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if (kstrtoul(esc, 10, &lcd.addr.x) < 0)
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break;
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} else if (*esc == 'y') {
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esc++;
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if (kstrtoul(esc, 10, &lcd_addr_y) < 0)
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if (kstrtoul(esc, 10, &lcd.addr.y) < 0)
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break;
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} else {
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break;
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@ -1237,25 +1245,25 @@ static inline int handle_lcd_special_code(void)
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}
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/* Check whether one flag was changed */
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if (oldflags != lcd_flags) {
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if (oldflags != lcd.flags) {
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/* check whether one of B,C,D flags were changed */
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if ((oldflags ^ lcd_flags) &
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if ((oldflags ^ lcd.flags) &
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(LCD_FLAG_B | LCD_FLAG_C | LCD_FLAG_D))
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/* set display mode */
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lcd_write_cmd(0x08
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| ((lcd_flags & LCD_FLAG_D) ? 4 : 0)
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| ((lcd_flags & LCD_FLAG_C) ? 2 : 0)
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| ((lcd_flags & LCD_FLAG_B) ? 1 : 0));
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| ((lcd.flags & LCD_FLAG_D) ? 4 : 0)
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| ((lcd.flags & LCD_FLAG_C) ? 2 : 0)
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| ((lcd.flags & LCD_FLAG_B) ? 1 : 0));
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/* check whether one of F,N flags was changed */
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else if ((oldflags ^ lcd_flags) & (LCD_FLAG_F | LCD_FLAG_N))
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else if ((oldflags ^ lcd.flags) & (LCD_FLAG_F | LCD_FLAG_N))
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lcd_write_cmd(0x30
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| ((lcd_flags & LCD_FLAG_F) ? 4 : 0)
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| ((lcd_flags & LCD_FLAG_N) ? 8 : 0));
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| ((lcd.flags & LCD_FLAG_F) ? 4 : 0)
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| ((lcd.flags & LCD_FLAG_N) ? 8 : 0));
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/* check whether L flag was changed */
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else if ((oldflags ^ lcd_flags) & (LCD_FLAG_L)) {
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if (lcd_flags & (LCD_FLAG_L))
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else if ((oldflags ^ lcd.flags) & (LCD_FLAG_L)) {
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if (lcd.flags & (LCD_FLAG_L))
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lcd_backlight(1);
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else if (light_tempo == 0)
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else if (lcd.light_tempo == 0)
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/* switch off the light only when the tempo
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lighting is gone */
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lcd_backlight(0);
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@ -1268,29 +1276,29 @@ static inline int handle_lcd_special_code(void)
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static void lcd_write_char(char c)
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{
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/* first, we'll test if we're in escape mode */
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if ((c != '\n') && lcd_escape_len >= 0) {
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if ((c != '\n') && lcd.esc_seq.len >= 0) {
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/* yes, let's add this char to the buffer */
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lcd_escape[lcd_escape_len++] = c;
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lcd_escape[lcd_escape_len] = 0;
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lcd.esc_seq.buf[lcd.esc_seq.len++] = c;
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lcd.esc_seq.buf[lcd.esc_seq.len] = 0;
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} else {
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/* aborts any previous escape sequence */
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lcd_escape_len = -1;
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lcd.esc_seq.len = -1;
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switch (c) {
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case LCD_ESCAPE_CHAR:
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/* start of an escape sequence */
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lcd_escape_len = 0;
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lcd_escape[lcd_escape_len] = 0;
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lcd.esc_seq.len = 0;
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lcd.esc_seq.buf[lcd.esc_seq.len] = 0;
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break;
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case '\b':
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/* go back one char and clear it */
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if (lcd_addr_x > 0) {
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if (lcd.addr.x > 0) {
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/* check if we're not at the
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end of the line */
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if (lcd_addr_x < lcd.bwidth)
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if (lcd.addr.x < lcd.bwidth)
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/* back one char */
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lcd_write_cmd(0x10);
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lcd_addr_x--;
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lcd.addr.x--;
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}
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/* replace with a space */
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lcd_write_data(' ');
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@ -1304,15 +1312,15 @@ static void lcd_write_char(char c)
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case '\n':
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/* flush the remainder of the current line and
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go to the beginning of the next line */
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for (; lcd_addr_x < lcd.bwidth; lcd_addr_x++)
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for (; lcd.addr.x < lcd.bwidth; lcd.addr.x++)
|
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lcd_write_data(' ');
|
||||
lcd_addr_x = 0;
|
||||
lcd_addr_y = (lcd_addr_y + 1) % lcd.height;
|
||||
lcd.addr.x = 0;
|
||||
lcd.addr.y = (lcd.addr.y + 1) % lcd.height;
|
||||
lcd_gotoxy();
|
||||
break;
|
||||
case '\r':
|
||||
/* go to the beginning of the same line */
|
||||
lcd_addr_x = 0;
|
||||
lcd.addr.x = 0;
|
||||
lcd_gotoxy();
|
||||
break;
|
||||
case '\t':
|
||||
@ -1328,32 +1336,32 @@ static void lcd_write_char(char c)
|
||||
|
||||
/* now we'll see if we're in an escape mode and if the current
|
||||
escape sequence can be understood. */
|
||||
if (lcd_escape_len >= 2) {
|
||||
if (lcd.esc_seq.len >= 2) {
|
||||
int processed = 0;
|
||||
|
||||
if (!strcmp(lcd_escape, "[2J")) {
|
||||
if (!strcmp(lcd.esc_seq.buf, "[2J")) {
|
||||
/* clear the display */
|
||||
lcd_clear_fast();
|
||||
processed = 1;
|
||||
} else if (!strcmp(lcd_escape, "[H")) {
|
||||
} else if (!strcmp(lcd.esc_seq.buf, "[H")) {
|
||||
/* cursor to home */
|
||||
lcd_addr_x = 0;
|
||||
lcd_addr_y = 0;
|
||||
lcd.addr.x = 0;
|
||||
lcd.addr.y = 0;
|
||||
lcd_gotoxy();
|
||||
processed = 1;
|
||||
}
|
||||
/* codes starting with ^[[L */
|
||||
else if ((lcd_escape_len >= 3) &&
|
||||
(lcd_escape[0] == '[') &&
|
||||
(lcd_escape[1] == 'L')) {
|
||||
else if ((lcd.esc_seq.len >= 3) &&
|
||||
(lcd.esc_seq.buf[0] == '[') &&
|
||||
(lcd.esc_seq.buf[1] == 'L')) {
|
||||
processed = handle_lcd_special_code();
|
||||
}
|
||||
|
||||
/* LCD special escape codes */
|
||||
/* flush the escape sequence if it's been processed
|
||||
or if it is getting too long. */
|
||||
if (processed || (lcd_escape_len >= LCD_ESCAPE_LEN))
|
||||
lcd_escape_len = -1;
|
||||
if (processed || (lcd.esc_seq.len >= LCD_ESCAPE_LEN))
|
||||
lcd.esc_seq.len = -1;
|
||||
} /* escape codes */
|
||||
}
|
||||
|
||||
@ -1386,9 +1394,9 @@ static int lcd_open(struct inode *inode, struct file *file)
|
||||
if (file->f_mode & FMODE_READ) /* device is write-only */
|
||||
return -EPERM;
|
||||
|
||||
if (lcd_must_clear) {
|
||||
if (lcd.must_clear) {
|
||||
lcd_clear_display();
|
||||
lcd_must_clear = 0;
|
||||
lcd.must_clear = false;
|
||||
}
|
||||
return nonseekable_open(inode, file);
|
||||
}
|
||||
@ -1418,7 +1426,7 @@ static void panel_lcd_print(const char *s)
|
||||
const char *tmp = s;
|
||||
int count = strlen(s);
|
||||
|
||||
if (lcd.enabled && lcd_initialized) {
|
||||
if (lcd.enabled && lcd.initialized) {
|
||||
for (; count-- > 0; tmp++) {
|
||||
if (!in_interrupt() && (((count + 1) & 0x1f) == 0))
|
||||
/* let's be a little nice with other processes
|
||||
@ -1599,7 +1607,7 @@ static void lcd_init(void)
|
||||
/* before this line, we must NOT send anything to the display.
|
||||
* Since lcd_init_display() needs to write data, we have to
|
||||
* enable mark the LCD initialized just before. */
|
||||
lcd_initialized = 1;
|
||||
lcd.initialized = true;
|
||||
lcd_init_display();
|
||||
|
||||
/* display a short message */
|
||||
@ -1611,10 +1619,10 @@ static void lcd_init(void)
|
||||
panel_lcd_print("\x1b[Lc\x1b[Lb\x1b[L*Linux-" UTS_RELEASE "\nPanel-"
|
||||
PANEL_VERSION);
|
||||
#endif
|
||||
lcd_addr_x = 0;
|
||||
lcd_addr_y = 0;
|
||||
lcd.addr.x = 0;
|
||||
lcd.addr.y = 0;
|
||||
/* clear the display on the next device opening */
|
||||
lcd_must_clear = 1;
|
||||
lcd.must_clear = true;
|
||||
lcd_gotoxy();
|
||||
}
|
||||
|
||||
@ -1950,14 +1958,16 @@ static void panel_scan_timer(void)
|
||||
panel_process_inputs();
|
||||
}
|
||||
|
||||
if (lcd.enabled && lcd_initialized) {
|
||||
if (lcd.enabled && lcd.initialized) {
|
||||
if (keypressed) {
|
||||
if (light_tempo == 0 && ((lcd_flags & LCD_FLAG_L) == 0))
|
||||
if (lcd.light_tempo == 0
|
||||
&& ((lcd.flags & LCD_FLAG_L) == 0))
|
||||
lcd_backlight(1);
|
||||
light_tempo = FLASH_LIGHT_TEMPO;
|
||||
} else if (light_tempo > 0) {
|
||||
light_tempo--;
|
||||
if (light_tempo == 0 && ((lcd_flags & LCD_FLAG_L) == 0))
|
||||
lcd.light_tempo = FLASH_LIGHT_TEMPO;
|
||||
} else if (lcd.light_tempo > 0) {
|
||||
lcd.light_tempo--;
|
||||
if (lcd.light_tempo == 0
|
||||
&& ((lcd.flags & LCD_FLAG_L) == 0))
|
||||
lcd_backlight(0);
|
||||
}
|
||||
}
|
||||
@ -2129,7 +2139,7 @@ static void keypad_init(void)
|
||||
static int panel_notify_sys(struct notifier_block *this, unsigned long code,
|
||||
void *unused)
|
||||
{
|
||||
if (lcd.enabled && lcd_initialized) {
|
||||
if (lcd.enabled && lcd.initialized) {
|
||||
switch (code) {
|
||||
case SYS_DOWN:
|
||||
panel_lcd_print
|
||||
@ -2222,9 +2232,9 @@ static void panel_detach(struct parport *port)
|
||||
keypad_initialized = 0;
|
||||
}
|
||||
|
||||
if (lcd.enabled && lcd_initialized) {
|
||||
if (lcd.enabled && lcd.initialized) {
|
||||
misc_deregister(&lcd_dev);
|
||||
lcd_initialized = 0;
|
||||
lcd.initialized = false;
|
||||
}
|
||||
|
||||
parport_release(pprt);
|
||||
@ -2300,6 +2310,9 @@ static int __init panel_init_module(void)
|
||||
lcd.pins.da = lcd_da_pin;
|
||||
lcd.pins.bl = lcd_bl_pin;
|
||||
|
||||
/* Leave it for now, just in case */
|
||||
lcd.esc_seq.len = -1;
|
||||
|
||||
/*
|
||||
* Overwrite selection with module param values (both keypad and lcd),
|
||||
* where the deprecated params have lower prio.
|
||||
@ -2385,7 +2398,7 @@ static void __exit panel_cleanup_module(void)
|
||||
panel_lcd_print("\x0cLCD driver " PANEL_VERSION
|
||||
"\nunloaded.\x1b[Lc\x1b[Lb\x1b[L-");
|
||||
misc_deregister(&lcd_dev);
|
||||
lcd_initialized = 0;
|
||||
lcd.initialized = false;
|
||||
}
|
||||
|
||||
/* TODO: free all input signals */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user