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Subject[PATCH v2 10/32] auxdisplay: add home to charlcd_ops
Date
From: Lars Poeschel <poeschel@lemonage.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.

Signed-off-by: Lars Poeschel <poeschel@lemonage.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 e04c81bbd333..e659f16e9139 100644
--- a/drivers/auxdisplay/hd44780_common.c
+++ b/drivers/auxdisplay/hd44780_common.c
@@ -40,6 +40,14 @@ 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
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