[PATCH 2/3] video: fbdev: ssd1307fb: Support to pixel inversion
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STALE2343d
From: Rodrigo Rolim Mendes de Alencar <hidden>
Date: 2020-05-12 20:53:20
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Subsystem:
drm drivers, drm drivers and misc gpu patches, framebuffer layer, open firmware and flattened device tree bindings, the rest · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Helge Deller, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
Pixel inversion in hardware is performed by issuing the command 0xa7. This patch adds a boolean property to control color inversion. Signed-off-by: Rodrigo Alencar <redacted> --- .../devicetree/bindings/display/ssd1307fb.txt | 1 + drivers/video/fbdev/ssd1307fb.c | 11 ++++++++++- 2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/display/ssd1307fb.txt b/Documentation/devicetree/bindings/display/ssd1307fb.txt
index 74a7b228bcef..3076b71ede68 100644
--- a/Documentation/devicetree/bindings/display/ssd1307fb.txt
+++ b/Documentation/devicetree/bindings/display/ssd1307fb.txt@@ -22,6 +22,7 @@ Optional properties: - solomon,com-seq: Display uses sequential COM pin configuration - solomon,com-lrremap: Display uses left-right COM pin remap - solomon,com-invdir: Display uses inverted COM pin scan direction + - solomon,color-inv: Set Inverse display mode (invert pixel color) - solomon,com-offset: Number of the COM pin wired to the first display line - solomon,col-offset: Offset of columns (SEG) that the screen is mapped to. - solomon,prechargep1: Length of deselect period (phase 1) in clock cycles.
diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
index ac88bbe174b6..748c21c0567b 100644
--- a/drivers/video/fbdev/ssd1307fb.c
+++ b/drivers/video/fbdev/ssd1307fb.c@@ -31,8 +31,9 @@ #define SSD1307FB_SET_LOOKUP_TABLE 0x91 #define SSD1307FB_CHARGE_PUMP 0x8d #define SSD1307FB_SEG_REMAP_ON 0xa1 -#define SSD1307FB_DISPLAY_OFF 0xae +#define SSD1307FB_DISPLAY_NORMAL 0xa6 #define SSD1307FB_SET_MULTIPLEX_RATIO 0xa8 +#define SSD1307FB_DISPLAY_OFF 0xae #define SSD1307FB_DISPLAY_ON 0xaf #define SSD1307FB_START_PAGE_ADDRESS 0xb0 #define SSD1307FB_SET_DISPLAY_OFFSET 0xd3
@@ -62,6 +63,7 @@ struct ssd1307fb_deviceinfo { struct ssd1307fb_par { unsigned area_color_enable : 1; unsigned com_invdir : 1; + unsigned color_inv : 1; unsigned com_lrremap : 1; unsigned com_seq : 1; unsigned lookup_table_set : 1;
@@ -492,6 +494,12 @@ static int ssd1307fb_init(struct ssd1307fb_par *par) if (ret < 0) return ret; + /* Set normal or inverse */ + ret = ssd1307fb_write_cmd(par->client, + SSD1307FB_DISPLAY_NORMAL | (par->color_inv & 0x1)); + if (ret < 0) + return ret; + /* Clear the screen */ ssd1307fb_update_display(par);
@@ -666,6 +674,7 @@ static int ssd1307fb_probe(struct i2c_client *client, par->com_seq = of_property_read_bool(node, "solomon,com-seq"); par->com_lrremap = of_property_read_bool(node, "solomon,com-lrremap"); par->com_invdir = of_property_read_bool(node, "solomon,com-invdir"); + par->color_inv = of_property_read_bool(node, "solomon,color-inv"); par->area_color_enable of_property_read_bool(node, "solomon,area-color-enable"); par->low_power = of_property_read_bool(node, "solomon,low-power");
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2.23.0.rc1