linux-kernel - [PATCH v4 10/32] auxdisplay: add home to charlcd

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Message-Id: <20201005122732.3429347-11-poeschel@lemonage.de>
Date:   Mon,  5 Oct 2020 14:27:10 +0200
From:   poeschel@...onage.de
To:     Miguel Ojeda Sandonis <miguel.ojeda.sandonis@...il.com>,
        Willy Tarreau <willy@...roxy.com>,
        Ksenija Stanojevic <ksenija.stanojevic@...il.com>,
        linux-kernel@...r.kernel.org (open list)
Cc:     Lars Poeschel <poeschel@...onage.de>, Willy Tarreau <w@....eu>
Subject: [PATCH v4 10/32] auxdisplay: add home to charlcd_ops

From: Lars Poeschel <poeschel@...onage.de>

This adds a home function to the charlcd_ops struct and offer an
implementation for hd44780_common. This implementation is used by our
two hd44780 drivers. This is to make charlcd device independent.

Reviewed-by: Willy Tarreau <w@....eu>
Signed-off-by: Lars Poeschel <poeschel@...onage.de>
---
 drivers/auxdisplay/charlcd.c        | 2 +-
 drivers/auxdisplay/charlcd.h        | 3 +++
 drivers/auxdisplay/hd44780.c        | 2 ++
 drivers/auxdisplay/hd44780_common.c | 8 ++++++++
 drivers/auxdisplay/hd44780_common.h | 1 +
 drivers/auxdisplay/panel.c          | 3 +++
 6 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/auxdisplay/charlcd.c b/drivers/auxdisplay/charlcd.c
index d6f971eea6ae..44dd6e02eaf9 100644
--- a/drivers/auxdisplay/charlcd.c
+++ b/drivers/auxdisplay/charlcd.c
@@ -144,7 +144,7 @@ static void charlcd_home(struct charlcd *lcd)
 {
 	lcd->addr.x = 0;
 	lcd->addr.y = 0;
-	lcd->ops->gotoxy(lcd);
+	lcd->ops->home(lcd);
 }
 
 static void charlcd_print(struct charlcd *lcd, char c)
diff --git a/drivers/auxdisplay/charlcd.h b/drivers/auxdisplay/charlcd.h
index 04fd241fe6d6..12c348c1a0ae 100644
--- a/drivers/auxdisplay/charlcd.h
+++ b/drivers/auxdisplay/charlcd.h
@@ -40,12 +40,15 @@ struct charlcd {
  * wrap to the next line at the end of a line.
  * @gotoxy: Set cursor to x, y. The x and y values to set the cursor to are
  * 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.
  */
 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 (*home)(struct charlcd *lcd);
 };
 
 struct charlcd *charlcd_alloc(void);
diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index 4d9478f6e5ff..b0893ea49165 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -128,6 +128,7 @@ static const struct charlcd_ops hd44780_ops_gpio8 = {
 	.backlight	= hd44780_backlight,
 	.print		= hd44780_common_print,
 	.gotoxy		= hd44780_common_gotoxy,
+	.home		= hd44780_common_home,
 };
 
 /* Send a command to the LCD panel in 4 bit GPIO mode */
@@ -173,6 +174,7 @@ static const struct charlcd_ops hd44780_ops_gpio4 = {
 	.backlight	= hd44780_backlight,
 	.print		= hd44780_common_print,
 	.gotoxy		= hd44780_common_gotoxy,
+	.home		= hd44780_common_home,
 };
 
 static int hd44780_probe(struct platform_device *pdev)
diff --git a/drivers/auxdisplay/hd44780_common.c b/drivers/auxdisplay/hd44780_common.c
index 9e463b2fa03f..a0ce390c6b2e 100644
--- a/drivers/auxdisplay/hd44780_common.c
+++ b/drivers/auxdisplay/hd44780_common.c
@@ -41,6 +41,14 @@ int hd44780_common_gotoxy(struct charlcd *lcd)
 }
 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);
+}
+EXPORT_SYMBOL_GPL(hd44780_common_home);
+
 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 0bee6c22761e..1365484963d8 100644
--- a/drivers/auxdisplay/hd44780_common.h
+++ b/drivers/auxdisplay/hd44780_common.h
@@ -16,5 +16,6 @@ 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);
 struct hd44780_common *hd44780_common_alloc(void);
 
diff --git a/drivers/auxdisplay/panel.c b/drivers/auxdisplay/panel.c
index 75894eacd12f..b1e874f07456 100644
--- a/drivers/auxdisplay/panel.c
+++ b/drivers/auxdisplay/panel.c
@@ -876,18 +876,21 @@ static const struct charlcd_ops charlcd_serial_ops = {
 	.clear_fast	= lcd_clear_fast_s,
 	.backlight	= lcd_backlight,
 	.gotoxy		= hd44780_common_gotoxy,
+	.home		= hd44780_common_home,
 };
 
 static const struct charlcd_ops charlcd_parallel_ops = {
 	.clear_fast	= lcd_clear_fast_p8,
 	.backlight	= lcd_backlight,
 	.gotoxy		= hd44780_common_gotoxy,
+	.home		= hd44780_common_home,
 };
 
 static const struct charlcd_ops charlcd_tilcd_ops = {
 	.clear_fast	= lcd_clear_fast_tilcd,
 	.backlight	= lcd_backlight,
 	.gotoxy		= hd44780_common_gotoxy,
+	.home		= hd44780_common_home,
 };
 
 /* initialize the LCD driver */
-- 
2.28.0