diff options
author | Lars Poeschel <poeschel@lemonage.de> | 2020-11-03 10:58:18 +0100 |
---|---|---|
committer | Miguel Ojeda <ojeda@kernel.org> | 2020-11-04 11:04:04 +0100 |
commit | d2f2187e8f27cd884150acdce7ec96135260413b (patch) | |
tree | 1d9f26fc7efc246b9a83643f5be97a60bc6aa56c /drivers/auxdisplay | |
parent | 01ec46dfa633a52ccfe38d4a194460d6adb2ba00 (diff) | |
download | linux-d2f2187e8f27cd884150acdce7ec96135260413b.tar.bz2 |
auxdisplay: implement various hd44780_common_ functions
This implements various hd44780_common_ functions for hd44780 compatible
display drivers to use. charlcd then calls these functions through its
ops function pointer.
The functions namely are:
- hd44780_common_shift_cursor
- hd44780_common_display_shift
- hd44780_common_display
- hd44780_common_cursor
- hd44780_common_blink
- hd44780_common_fontsize
- hd44780_common_lines
Reviewed-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Lars Poeschel <poeschel@lemonage.de>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'drivers/auxdisplay')
-rw-r--r-- | drivers/auxdisplay/charlcd.c | 73 | ||||
-rw-r--r-- | drivers/auxdisplay/charlcd.h | 28 | ||||
-rw-r--r-- | drivers/auxdisplay/hd44780.c | 14 | ||||
-rw-r--r-- | drivers/auxdisplay/hd44780_common.c | 131 | ||||
-rw-r--r-- | drivers/auxdisplay/hd44780_common.h | 9 | ||||
-rw-r--r-- | drivers/auxdisplay/panel.c | 21 |
6 files changed, 249 insertions, 27 deletions
diff --git a/drivers/auxdisplay/charlcd.c b/drivers/auxdisplay/charlcd.c index 94f6b0afab13..281a3259c144 100644 --- a/drivers/auxdisplay/charlcd.c +++ b/drivers/auxdisplay/charlcd.c @@ -31,10 +31,6 @@ #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 */ @@ -236,26 +232,44 @@ static inline int handle_lcd_special_code(struct charlcd *lcd) 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 */ @@ -272,47 +286,54 @@ static inline int handle_lcd_special_code(struct charlcd *lcd) 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 (lcd->addr.x > 0) { - /* back one char if not at end of line */ - if (lcd->addr.x < hdc->bwidth) - hdc->write_cmd(hdc, LCD_CMD_SHIFT); - lcd->addr.x--; + if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_LEFT)) + lcd->addr.x--; } + processed = 1; break; case 'r': /* shift cursor right */ if (lcd->addr.x < lcd->width) { - /* allow the cursor to pass the end of the line */ - if (lcd->addr.x < (hdc->bwidth - 1)) - hdc->write_cmd(hdc, - LCD_CMD_SHIFT | LCD_CMD_SHIFT_RIGHT); - lcd->addr.x++; + if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_RIGHT)) + lcd->addr.x++; } + processed = 1; break; case 'L': /* shift display left */ - hdc->write_cmd(hdc, LCD_CMD_SHIFT | LCD_CMD_DISPLAY_SHIFT); + lcd->ops->shift_display(lcd, CHARLCD_SHIFT_LEFT); processed = 1; break; case 'R': /* shift display right */ - hdc->write_cmd(hdc, - 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 */ @@ -456,19 +477,17 @@ static void charlcd_write_char(struct charlcd *lcd, char c) case '\b': /* go back one char and clear it */ if (lcd->addr.x > 0) { - /* - * check if we're not at the - * end of the line - */ - if (lcd->addr.x < hdc->bwidth) - /* back one char */ - hdc->write_cmd(hdc, LCD_CMD_SHIFT); - lcd->addr.x--; + /* back one char */ + if (!lcd->ops->shift_cursor(lcd, + CHARLCD_SHIFT_LEFT)) + lcd->addr.x--; } /* replace with a space */ - hdc->write_data(hdc, ' '); + charlcd_print(lcd, ' '); /* back one char again */ - hdc->write_cmd(hdc, LCD_CMD_SHIFT); + if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_LEFT)) + lcd->addr.x--; + break; case '\f': /* quickly clear the display */ diff --git a/drivers/auxdisplay/charlcd.h b/drivers/auxdisplay/charlcd.h index dd40fd814a57..5a89bdeb659a 100644 --- a/drivers/auxdisplay/charlcd.h +++ b/drivers/auxdisplay/charlcd.h @@ -21,6 +21,21 @@ enum charlcd_onoff { CHARLCD_ON, }; +enum charlcd_shift_dir { + CHARLCD_SHIFT_LEFT, + CHARLCD_SHIFT_RIGHT, +}; + +enum charlcd_fontsize { + CHARLCD_FONTSIZE_SMALL, + CHARLCD_FONTSIZE_LARGE, +}; + +enum charlcd_lines { + CHARLCD_LINES_1, + CHARLCD_LINES_2, +}; + struct charlcd { const struct charlcd_ops *ops; const unsigned char *char_conv; /* Optional */ @@ -54,6 +69,12 @@ struct charlcd { * values in addr.x and addr.y are set to 0, 0 by charlcd prior to calling this * function. * @init_display: Initialize the display. + * @shift_cursor: Shift cursor left or right one position. + * @shift_display: Shift whole display content left or right. + * @display: Turn display on or off. + * @cursor: Turn cursor on or off. + * @blink: Turn cursor blink on or off. + * @lines: One or two lines. */ struct charlcd_ops { void (*clear_fast)(struct charlcd *lcd); @@ -63,6 +84,13 @@ struct charlcd_ops { int (*home)(struct charlcd *lcd); int (*clear_display)(struct charlcd *lcd); int (*init_display)(struct charlcd *lcd); + int (*shift_cursor)(struct charlcd *lcd, enum charlcd_shift_dir dir); + int (*shift_display)(struct charlcd *lcd, enum charlcd_shift_dir dir); + int (*display)(struct charlcd *lcd, enum charlcd_onoff on); + int (*cursor)(struct charlcd *lcd, enum charlcd_onoff on); + int (*blink)(struct charlcd *lcd, enum charlcd_onoff on); + int (*fontsize)(struct charlcd *lcd, enum charlcd_fontsize size); + int (*lines)(struct charlcd *lcd, enum charlcd_lines lines); }; void charlcd_backlight(struct charlcd *lcd, enum charlcd_onoff on); diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c index 5916da09f738..7b7b28d72198 100644 --- a/drivers/auxdisplay/hd44780.c +++ b/drivers/auxdisplay/hd44780.c @@ -131,6 +131,13 @@ static const struct charlcd_ops hd44780_ops_gpio8 = { .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, }; /* Send a command to the LCD panel in 4 bit GPIO mode */ @@ -179,6 +186,13 @@ static const struct charlcd_ops hd44780_ops_gpio4 = { .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, }; static int hd44780_probe(struct platform_device *pdev) diff --git a/drivers/auxdisplay/hd44780_common.c b/drivers/auxdisplay/hd44780_common.c index 7d4aea36cc55..9d538fdcd260 100644 --- a/drivers/auxdisplay/hd44780_common.c +++ b/drivers/auxdisplay/hd44780_common.c @@ -17,6 +17,10 @@ #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 */ @@ -158,6 +162,133 @@ int hd44780_common_init_display(struct charlcd *lcd) } EXPORT_SYMBOL_GPL(hd44780_common_init_display); +int hd44780_common_shift_cursor(struct charlcd *lcd, enum charlcd_shift_dir dir) +{ + struct hd44780_common *hdc = lcd->drvdata; + + if (dir == CHARLCD_SHIFT_LEFT) { + /* back one char if not at end of line */ + if (lcd->addr.x < hdc->bwidth) + hdc->write_cmd(hdc, LCD_CMD_SHIFT); + } else if (dir == CHARLCD_SHIFT_RIGHT) { + /* allow the cursor to pass the end of the line */ + if (lcd->addr.x < (hdc->bwidth - 1)) + hdc->write_cmd(hdc, + LCD_CMD_SHIFT | LCD_CMD_SHIFT_RIGHT); + } + + return 0; +} +EXPORT_SYMBOL_GPL(hd44780_common_shift_cursor); + +int hd44780_common_shift_display(struct charlcd *lcd, + enum charlcd_shift_dir dir) +{ + struct hd44780_common *hdc = lcd->drvdata; + + if (dir == CHARLCD_SHIFT_LEFT) + hdc->write_cmd(hdc, LCD_CMD_SHIFT | LCD_CMD_DISPLAY_SHIFT); + else if (dir == CHARLCD_SHIFT_RIGHT) + hdc->write_cmd(hdc, LCD_CMD_SHIFT | LCD_CMD_DISPLAY_SHIFT | + LCD_CMD_SHIFT_RIGHT); + + return 0; +} +EXPORT_SYMBOL_GPL(hd44780_common_shift_display); + +static void hd44780_common_set_mode(struct hd44780_common *hdc) +{ + hdc->write_cmd(hdc, + LCD_CMD_DISPLAY_CTRL | + ((hdc->hd44780_common_flags & LCD_FLAG_D) ? + LCD_CMD_DISPLAY_ON : 0) | + ((hdc->hd44780_common_flags & LCD_FLAG_C) ? + LCD_CMD_CURSOR_ON : 0) | + ((hdc->hd44780_common_flags & LCD_FLAG_B) ? + LCD_CMD_BLINK_ON : 0)); +} + +int hd44780_common_display(struct charlcd *lcd, enum charlcd_onoff on) +{ + struct hd44780_common *hdc = lcd->drvdata; + + if (on == CHARLCD_ON) + hdc->hd44780_common_flags |= LCD_FLAG_D; + else + hdc->hd44780_common_flags &= ~LCD_FLAG_D; + + hd44780_common_set_mode(hdc); + return 0; +} +EXPORT_SYMBOL_GPL(hd44780_common_display); + +int hd44780_common_cursor(struct charlcd *lcd, enum charlcd_onoff on) +{ + struct hd44780_common *hdc = lcd->drvdata; + + if (on == CHARLCD_ON) + hdc->hd44780_common_flags |= LCD_FLAG_C; + else + hdc->hd44780_common_flags &= ~LCD_FLAG_C; + + hd44780_common_set_mode(hdc); + return 0; +} +EXPORT_SYMBOL_GPL(hd44780_common_cursor); + +int hd44780_common_blink(struct charlcd *lcd, enum charlcd_onoff on) +{ + struct hd44780_common *hdc = lcd->drvdata; + + if (on == CHARLCD_ON) + hdc->hd44780_common_flags |= LCD_FLAG_B; + else + hdc->hd44780_common_flags &= ~LCD_FLAG_B; + + hd44780_common_set_mode(hdc); + return 0; +} +EXPORT_SYMBOL_GPL(hd44780_common_blink); + +static void hd44780_common_set_function(struct hd44780_common *hdc) +{ + hdc->write_cmd(hdc, + LCD_CMD_FUNCTION_SET | + ((hdc->ifwidth == 8) ? LCD_CMD_DATA_LEN_8BITS : 0) | + ((hdc->hd44780_common_flags & LCD_FLAG_F) ? + LCD_CMD_FONT_5X10_DOTS : 0) | + ((hdc->hd44780_common_flags & LCD_FLAG_N) ? + LCD_CMD_TWO_LINES : 0)); +} + +int hd44780_common_fontsize(struct charlcd *lcd, enum charlcd_fontsize size) +{ + struct hd44780_common *hdc = lcd->drvdata; + + if (size == CHARLCD_FONTSIZE_LARGE) + hdc->hd44780_common_flags |= LCD_FLAG_F; + else + hdc->hd44780_common_flags &= ~LCD_FLAG_F; + + hd44780_common_set_function(hdc); + return 0; +} +EXPORT_SYMBOL_GPL(hd44780_common_fontsize); + +int hd44780_common_lines(struct charlcd *lcd, enum charlcd_lines lines) +{ + struct hd44780_common *hdc = lcd->drvdata; + + if (lines == CHARLCD_LINES_2) + hdc->hd44780_common_flags |= LCD_FLAG_N; + else + hdc->hd44780_common_flags &= ~LCD_FLAG_N; + + hd44780_common_set_function(hdc); + return 0; +} +EXPORT_SYMBOL_GPL(hd44780_common_lines); + struct hd44780_common *hd44780_common_alloc(void) { struct hd44780_common *hd; diff --git a/drivers/auxdisplay/hd44780_common.h b/drivers/auxdisplay/hd44780_common.h index a8e322891ce2..e5a69fdc3b61 100644 --- a/drivers/auxdisplay/hd44780_common.h +++ b/drivers/auxdisplay/hd44780_common.h @@ -20,4 +20,13 @@ int hd44780_common_gotoxy(struct charlcd *lcd); int hd44780_common_home(struct charlcd *lcd); int hd44780_common_clear_display(struct charlcd *lcd); int hd44780_common_init_display(struct charlcd *lcd); +int hd44780_common_shift_cursor(struct charlcd *lcd, + enum charlcd_shift_dir dir); +int hd44780_common_shift_display(struct charlcd *lcd, + enum charlcd_shift_dir dir); +int hd44780_common_display(struct charlcd *lcd, enum charlcd_onoff on); +int hd44780_common_cursor(struct charlcd *lcd, enum charlcd_onoff on); +int hd44780_common_blink(struct charlcd *lcd, enum charlcd_onoff on); +int hd44780_common_fontsize(struct charlcd *lcd, enum charlcd_fontsize size); +int hd44780_common_lines(struct charlcd *lcd, enum charlcd_lines lines); struct hd44780_common *hd44780_common_alloc(void); diff --git a/drivers/auxdisplay/panel.c b/drivers/auxdisplay/panel.c index 583bd22d3abd..3d33d7cc979c 100644 --- a/drivers/auxdisplay/panel.c +++ b/drivers/auxdisplay/panel.c @@ -879,6 +879,13 @@ static const struct charlcd_ops charlcd_serial_ops = { .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, }; static const struct charlcd_ops charlcd_parallel_ops = { @@ -888,6 +895,13 @@ static const struct charlcd_ops charlcd_parallel_ops = { .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, }; static const struct charlcd_ops charlcd_tilcd_ops = { @@ -897,6 +911,13 @@ static const struct charlcd_ops charlcd_tilcd_ops = { .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, }; /* initialize the LCD driver */ |