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Date: Mon, 21 Sep 2020 16:46:42 +0200
From: poeschel@...onage.de
To: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@...il.com>,
linux-kernel@...r.kernel.org (open list)
Cc: Lars Poeschel <poeschel@...onage.de>
Subject: [PATCH v2 30/32] auxdisplay: Change gotoxy calling interface
From: Lars Poeschel <poeschel@...onage.de>
Change the calling interface for gotoxy from supplying the x and y
coordinates in the charlcd struct to explicitly supplying x and y in
the function arguments. This is more intuitive and allows for moving
the cursor to positions independent from the position saved in the
charlcd struct.
Signed-off-by: Lars Poeschel <poeschel@...onage.de>
---
drivers/auxdisplay/charlcd.c | 10 +++++-----
drivers/auxdisplay/charlcd.h | 2 +-
drivers/auxdisplay/hd44780_common.c | 15 ++++++---------
drivers/auxdisplay/hd44780_common.h | 2 +-
4 files changed, 13 insertions(+), 16 deletions(-)
diff --git a/drivers/auxdisplay/charlcd.c b/drivers/auxdisplay/charlcd.c
index 78a61c3f1eb0..cd3a304c08ec 100644
--- a/drivers/auxdisplay/charlcd.c
+++ b/drivers/auxdisplay/charlcd.c
@@ -119,7 +119,7 @@ static void charlcd_print(struct charlcd *lcd, char c)
/* prevents the cursor from wrapping onto the next line */
if (lcd->addr.x == lcd->width)
- lcd->ops->gotoxy(lcd);
+ lcd->ops->gotoxy(lcd, lcd->addr.x - 1, lcd->addr.y);
}
static void charlcd_clear_fast(struct charlcd *lcd)
@@ -329,7 +329,7 @@ static inline int handle_lcd_special_code(struct charlcd *lcd)
/* restore cursor position */
lcd->addr.x = xs;
lcd->addr.y = ys;
- lcd->ops->gotoxy(lcd);
+ lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);
processed = 1;
break;
}
@@ -353,7 +353,7 @@ static inline int handle_lcd_special_code(struct charlcd *lcd)
/* If the command is valid, move to the new address */
if (parse_xy(esc, &lcd->addr.x, &lcd->addr.y))
- lcd->ops->gotoxy(lcd);
+ lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);
/* Regardless of its validity, mark as processed */
processed = 1;
@@ -411,12 +411,12 @@ static void charlcd_write_char(struct charlcd *lcd, char c)
lcd->addr.x = 0;
lcd->addr.y = (lcd->addr.y + 1) % lcd->height;
- lcd->ops->gotoxy(lcd);
+ lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);
break;
case '\r':
/* go to the beginning of the same line */
lcd->addr.x = 0;
- lcd->ops->gotoxy(lcd);
+ lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);
break;
case '\t':
/* print a space instead of the tab */
diff --git a/drivers/auxdisplay/charlcd.h b/drivers/auxdisplay/charlcd.h
index 83fa989d37fa..7cddcbba4f2a 100644
--- a/drivers/auxdisplay/charlcd.h
+++ b/drivers/auxdisplay/charlcd.h
@@ -80,7 +80,7 @@ struct charlcd_ops {
void (*clear_fast)(struct charlcd *lcd);
void (*backlight)(struct charlcd *lcd, enum charlcd_onoff on);
int (*print)(struct charlcd *lcd, int c);
- int (*gotoxy)(struct charlcd *lcd);
+ int (*gotoxy)(struct charlcd *lcd, unsigned int x, unsigned int y);
int (*home)(struct charlcd *lcd);
int (*clear_display)(struct charlcd *lcd);
int (*init_display)(struct charlcd *lcd);
diff --git a/drivers/auxdisplay/hd44780_common.c b/drivers/auxdisplay/hd44780_common.c
index 46d86c9dbc44..89f202377ba5 100644
--- a/drivers/auxdisplay/hd44780_common.c
+++ b/drivers/auxdisplay/hd44780_common.c
@@ -48,7 +48,7 @@ int hd44780_common_print(struct charlcd *lcd, int c)
return 1;
}
-int hd44780_common_gotoxy(struct charlcd *lcd)
+int hd44780_common_gotoxy(struct charlcd *lcd, unsigned int x, unsigned int y)
{
struct hd44780_common *hdc = lcd->drvdata;
unsigned int addr;
@@ -57,11 +57,10 @@ int hd44780_common_gotoxy(struct charlcd *lcd)
* we force the cursor to stay at the end of the
* line if it wants to go farther
*/
- addr = lcd->addr.x < hdc->bwidth ? lcd->addr.x & (hdc->hwidth - 1)
- : hdc->bwidth - 1;
- if (lcd->addr.y & 1)
+ addr = x < hdc->bwidth ? x & (hdc->hwidth - 1) : hdc->bwidth - 1;
+ if (y & 1)
addr += hdc->hwidth;
- if (lcd->addr.y & 2)
+ if (y & 2)
addr += hdc->bwidth;
hdc->write_cmd(hdc, LCD_CMD_SET_DDRAM_ADDR | addr);
return 0;
@@ -70,9 +69,7 @@ EXPORT_SYMBOL_GPL(hd44780_common_gotoxy);
int hd44780_common_home(struct charlcd *lcd)
{
- lcd->addr.x = 0;
- lcd->addr.y = 0;
- return hd44780_common_gotoxy(lcd);
+ return hd44780_common_gotoxy(lcd, 0, 0);
}
EXPORT_SYMBOL_GPL(hd44780_common_home);
@@ -346,7 +343,7 @@ int hd44780_common_redefine_char(struct charlcd *lcd, char *esc)
hdc->write_data(hdc, cgbytes[addr]);
/* ensures that we stop writing to CGRAM */
- lcd->ops->gotoxy(lcd);
+ lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);
return 1;
}
EXPORT_SYMBOL_GPL(hd44780_common_redefine_char);
diff --git a/drivers/auxdisplay/hd44780_common.h b/drivers/auxdisplay/hd44780_common.h
index d3758230b7fd..7a7f316d15aa 100644
--- a/drivers/auxdisplay/hd44780_common.h
+++ b/drivers/auxdisplay/hd44780_common.h
@@ -16,7 +16,7 @@ struct hd44780_common {
};
int hd44780_common_print(struct charlcd *lcd, int c);
-int hd44780_common_gotoxy(struct charlcd *lcd);
+int hd44780_common_gotoxy(struct charlcd *lcd, unsigned int x, unsigned int y);
int hd44780_common_home(struct charlcd *lcd);
int hd44780_common_clear_display(struct charlcd *lcd);
int hd44780_common_init_display(struct charlcd *lcd);
--
2.28.0
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