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Subject[PATCH v2 19/32] auxdisplay: Implement hd44780_common_blink
Date
From: Lars Poeschel <poeschel@lemonage.de>

Implement a hd44780_common_blink function to turn on or off the blinking
of the cursor. The hd44780 drivers just use this function and charlcd
calls it through its ops function pointer.

Signed-off-by: Lars Poeschel <poeschel@lemonage.de>
---
drivers/auxdisplay/charlcd.c | 6 ++++++
drivers/auxdisplay/charlcd.h | 2 ++
drivers/auxdisplay/hd44780.c | 2 ++
drivers/auxdisplay/hd44780_common.c | 14 ++++++++++++++
drivers/auxdisplay/hd44780_common.h | 1 +
drivers/auxdisplay/panel.c | 3 +++
6 files changed, 28 insertions(+)

diff --git a/drivers/auxdisplay/charlcd.c b/drivers/auxdisplay/charlcd.c
index a2f0becb1a9f..b099897e101b 100644
--- a/drivers/auxdisplay/charlcd.c
+++ b/drivers/auxdisplay/charlcd.c
@@ -260,10 +260,16 @@ static inline int handle_lcd_special_code(struct charlcd *lcd)
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 */
diff --git a/drivers/auxdisplay/charlcd.h b/drivers/auxdisplay/charlcd.h
index 5aab359ebd91..d9d907db2724 100644
--- a/drivers/auxdisplay/charlcd.h
+++ b/drivers/auxdisplay/charlcd.h
@@ -62,6 +62,7 @@ struct charlcd {
* @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.
*/
struct charlcd_ops {
void (*clear_fast)(struct charlcd *lcd);
@@ -75,6 +76,7 @@ struct charlcd_ops {
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);
};

void charlcd_backlight(struct charlcd *lcd, enum charlcd_onoff on);
diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index d5ce3955b577..a8d6e5483a92 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -135,6 +135,7 @@ static const struct charlcd_ops hd44780_ops_gpio8 = {
.shift_display = hd44780_common_shift_display,
.display = hd44780_common_display,
.cursor = hd44780_common_cursor,
+ .blink = hd44780_common_blink,
};

/* Send a command to the LCD panel in 4 bit GPIO mode */
@@ -187,6 +188,7 @@ static const struct charlcd_ops hd44780_ops_gpio4 = {
.shift_display = hd44780_common_shift_display,
.display = hd44780_common_display,
.cursor = hd44780_common_cursor,
+ .blink = hd44780_common_blink,
};

static int hd44780_probe(struct platform_device *pdev)
diff --git a/drivers/auxdisplay/hd44780_common.c b/drivers/auxdisplay/hd44780_common.c
index af68eb5f3422..ecd2c2118318 100644
--- a/drivers/auxdisplay/hd44780_common.c
+++ b/drivers/auxdisplay/hd44780_common.c
@@ -235,6 +235,20 @@ int hd44780_common_cursor(struct charlcd *lcd, enum charlcd_onoff on)
}
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);
+
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 7327a9b2e997..b46171f21a05 100644
--- a/drivers/auxdisplay/hd44780_common.h
+++ b/drivers/auxdisplay/hd44780_common.h
@@ -26,5 +26,6 @@ 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);
struct hd44780_common *hd44780_common_alloc(void);

diff --git a/drivers/auxdisplay/panel.c b/drivers/auxdisplay/panel.c
index 26fbf91c1501..2d2f59360e1a 100644
--- a/drivers/auxdisplay/panel.c
+++ b/drivers/auxdisplay/panel.c
@@ -883,6 +883,7 @@ static const struct charlcd_ops charlcd_serial_ops = {
.shift_display = hd44780_common_shift_display,
.display = hd44780_common_display,
.cursor = hd44780_common_cursor,
+ .blink = hd44780_common_blink,
};

static const struct charlcd_ops charlcd_parallel_ops = {
@@ -896,6 +897,7 @@ static const struct charlcd_ops charlcd_parallel_ops = {
.shift_display = hd44780_common_shift_display,
.display = hd44780_common_display,
.cursor = hd44780_common_cursor,
+ .blink = hd44780_common_blink,
};

static const struct charlcd_ops charlcd_tilcd_ops = {
@@ -909,6 +911,7 @@ static const struct charlcd_ops charlcd_tilcd_ops = {
.shift_display = hd44780_common_shift_display,
.display = hd44780_common_display,
.cursor = hd44780_common_cursor,
+ .blink = hd44780_common_blink,
};

/* initialize the LCD driver */
--
2.28.0
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