Messages in this thread Patch in this message | | | From | poeschel@lemonage ... | Subject | [PATCH v4 11/32] auxdisplay: Move clear_display to hd44780_common | Date | Mon, 5 Oct 2020 14:27:11 +0200 |
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From: Lars Poeschel <poeschel@lemonage.de>
This moves the clear_display function from charlcd to hd44780_common. This is one more step to make charlcd independent from device specific code. The two hd44780 drivers use the new function from hd44780_common and charlcd calls this function through its function pointer in its ops structure.
Reviewed-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Lars Poeschel <poeschel@lemonage.de> --- drivers/auxdisplay/charlcd.c | 22 ++++++---------------- drivers/auxdisplay/charlcd.h | 4 ++++ drivers/auxdisplay/hd44780.c | 2 ++ drivers/auxdisplay/hd44780_common.c | 21 +++++++++++++++++++++ drivers/auxdisplay/hd44780_common.h | 1 + drivers/auxdisplay/panel.c | 3 +++ 6 files changed, 37 insertions(+), 16 deletions(-)
diff --git a/drivers/auxdisplay/charlcd.c b/drivers/auxdisplay/charlcd.c index 44dd6e02eaf9..fc0daf4987d5 100644 --- a/drivers/auxdisplay/charlcd.c +++ b/drivers/auxdisplay/charlcd.c @@ -34,8 +34,6 @@ #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 */ @@ -178,18 +176,6 @@ static void charlcd_clear_fast(struct charlcd *lcd) charlcd_home(lcd); } -/* clears the display and resets X/Y */ -static void charlcd_clear_display(struct charlcd *lcd) -{ - struct hd44780_common *hdc = lcd->drvdata; - - hdc->write_cmd(hdc, LCD_CMD_DISPLAY_CLEAR); - lcd->addr.x = 0; - lcd->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 hd44780_common *hdc, int cmd); @@ -254,7 +240,9 @@ static int charlcd_init_display(struct charlcd *lcd) /* entry mode set : increment, cursor shifting */ hdc->write_cmd(hdc, LCD_CMD_ENTRY_MODE | LCD_CMD_CURSOR_INC); - charlcd_clear_display(lcd); + lcd->ops->clear_display(lcd); + lcd->addr.x = 0; + lcd->addr.y = 0; return 0; } @@ -670,8 +658,10 @@ static int charlcd_open(struct inode *inode, struct file *file) 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); diff --git a/drivers/auxdisplay/charlcd.h b/drivers/auxdisplay/charlcd.h index 12c348c1a0ae..0b3dafbbae72 100644 --- a/drivers/auxdisplay/charlcd.h +++ b/drivers/auxdisplay/charlcd.h @@ -42,6 +42,9 @@ struct charlcd { * previously set in addr.x and addr.y by charlcd. * @home: Set cursor to 0, 0. The values in addr.x and addr.y are set to 0, 0 by * charlcd prior to calling this function. + * @clear_display: Again clear the whole display, set the cursor to 0, 0. The + * values in addr.x and addr.y are set to 0, 0 by charlcd prior to calling this + * function. */ struct charlcd_ops { void (*clear_fast)(struct charlcd *lcd); @@ -49,6 +52,7 @@ struct charlcd_ops { int (*print)(struct charlcd *lcd, int c); int (*gotoxy)(struct charlcd *lcd); int (*home)(struct charlcd *lcd); + int (*clear_display)(struct charlcd *lcd); }; struct charlcd *charlcd_alloc(void); diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c index b0893ea49165..40ea6d25dbe1 100644 --- a/drivers/auxdisplay/hd44780.c +++ b/drivers/auxdisplay/hd44780.c @@ -129,6 +129,7 @@ static const struct charlcd_ops hd44780_ops_gpio8 = { .print = hd44780_common_print, .gotoxy = hd44780_common_gotoxy, .home = hd44780_common_home, + .clear_display = hd44780_common_clear_display, }; /* Send a command to the LCD panel in 4 bit GPIO mode */ @@ -175,6 +176,7 @@ static const struct charlcd_ops hd44780_ops_gpio4 = { .print = hd44780_common_print, .gotoxy = hd44780_common_gotoxy, .home = hd44780_common_home, + .clear_display = hd44780_common_clear_display, }; static int hd44780_probe(struct platform_device *pdev) diff --git a/drivers/auxdisplay/hd44780_common.c b/drivers/auxdisplay/hd44780_common.c index a0ce390c6b2e..6bc2b3bf6139 100644 --- a/drivers/auxdisplay/hd44780_common.c +++ b/drivers/auxdisplay/hd44780_common.c @@ -1,13 +1,22 @@ // SPDX-License-Identifier: GPL-2.0-or-later #include <linux/module.h> +#include <linux/sched.h> #include <linux/slab.h> #include "charlcd.h" #include "hd44780_common.h" /* LCD commands */ +#define LCD_CMD_DISPLAY_CLEAR 0x01 /* Clear entire display */ + #define LCD_CMD_SET_DDRAM_ADDR 0x80 /* Set display data RAM address */ +/* sleeps that many milliseconds with a reschedule */ +static void long_sleep(int ms) +{ + schedule_timeout_interruptible(msecs_to_jiffies(ms)); +} + int hd44780_common_print(struct charlcd *lcd, int c) { struct hd44780_common *hdc = lcd->drvdata; @@ -49,6 +58,18 @@ int hd44780_common_home(struct charlcd *lcd) } EXPORT_SYMBOL_GPL(hd44780_common_home); +/* clears the display and resets X/Y */ +int hd44780_common_clear_display(struct charlcd *lcd) +{ + struct hd44780_common *hdc = lcd->drvdata; + + hdc->write_cmd(hdc, LCD_CMD_DISPLAY_CLEAR); + /* we must wait a few milliseconds (15) */ + long_sleep(15); + return 0; +} +EXPORT_SYMBOL_GPL(hd44780_common_clear_display); + 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 1365484963d8..11ec4baf6997 100644 --- a/drivers/auxdisplay/hd44780_common.h +++ b/drivers/auxdisplay/hd44780_common.h @@ -17,5 +17,6 @@ struct hd44780_common { int hd44780_common_print(struct charlcd *lcd, int c); int hd44780_common_gotoxy(struct charlcd *lcd); int hd44780_common_home(struct charlcd *lcd); +int hd44780_common_clear_display(struct charlcd *lcd); struct hd44780_common *hd44780_common_alloc(void); diff --git a/drivers/auxdisplay/panel.c b/drivers/auxdisplay/panel.c index b1e874f07456..8adf627529f1 100644 --- a/drivers/auxdisplay/panel.c +++ b/drivers/auxdisplay/panel.c @@ -877,6 +877,7 @@ static const struct charlcd_ops charlcd_serial_ops = { .backlight = lcd_backlight, .gotoxy = hd44780_common_gotoxy, .home = hd44780_common_home, + .clear_display = hd44780_common_clear_display, }; static const struct charlcd_ops charlcd_parallel_ops = { @@ -884,6 +885,7 @@ static const struct charlcd_ops charlcd_parallel_ops = { .backlight = lcd_backlight, .gotoxy = hd44780_common_gotoxy, .home = hd44780_common_home, + .clear_display = hd44780_common_clear_display, }; static const struct charlcd_ops charlcd_tilcd_ops = { @@ -891,6 +893,7 @@ static const struct charlcd_ops charlcd_tilcd_ops = { .backlight = lcd_backlight, .gotoxy = hd44780_common_gotoxy, .home = hd44780_common_home, + .clear_display = hd44780_common_clear_display, }; /* initialize the LCD driver */ -- 2.28.0
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