AUO-K190x: make color handling more flexible

Don't hardcode the 8bit mode in all parts. This creates the possibility
to add another colormode easily later on.

Signed-off-by: Heiko Stübner <heiko@sntech.de>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

1 files changed, 65 insertions, 14 deletions

diff --git a/drivers/video/auo_k190x.c b/drivers/video/auo_k190x.c
index a77513b0e18c..f7f00e34323e 100644
--- a/drivers/video/auo_k190x.c
+++ b/drivers/video/auo_k190x.c
@@ -60,8 +60,8 @@ static void auok190x_issue_cmd(struct auok190xfb_par *par, u16 data)
         par->board->set_ctl(par, AUOK190X_I80_DC, 1);
 }
 
-static int auok190x_issue_pixels(struct auok190xfb_par *par, int size,
-                                 u16 *data)
+static int auok190x_issue_pixels_gray8(struct auok190xfb_par *par, int size,
+                                       u16 *data)
 {
         struct device *dev = par->info->device;
         int i;
@@ -91,6 +91,21 @@ static int auok190x_issue_pixels(struct auok190xfb_par *par, int size,
         return 0;
 }
 
+static int auok190x_issue_pixels(struct auok190xfb_par *par, int size,
+                                 u16 *data)
+{
+        struct fb_info *info = par->info;
+        struct device *dev = par->info->device;
+
+        if (info->var.bits_per_pixel == 8 && info->var.grayscale)
+                auok190x_issue_pixels_gray8(par, size, data);
+        else
+                dev_err(dev, "unsupported color mode (bits: %d, gray: %d)\n",
+                        info->var.bits_per_pixel, info->var.grayscale);
+
+        return 0;
+}
+
 static u16 auok190x_read_data(struct auok190xfb_par *par)
 {
         u16 data;
@@ -382,6 +397,35 @@ static int auok190xfb_check_var(struct fb_var_screeninfo *var,
         int size;
 
         /*
+         * Color depth
+         */
+
+        if (var->bits_per_pixel == 8 && var->grayscale == 1) {
+                /*
+                 * For 8-bit grayscale, R, G, and B offset are equal.
+                 */
+                var->red.length = 8;
+                var->red.offset = 0;
+                var->red.msb_right = 0;
+
+                var->green.length = 8;
+                var->green.offset = 0;
+                var->green.msb_right = 0;
+
+                var->blue.length = 8;
+                var->blue.offset = 0;
+                var->blue.msb_right = 0;
+
+                var->transp.length = 0;
+                var->transp.offset = 0;
+                var->transp.msb_right = 0;
+        } else {
+                dev_warn(dev, "unsupported color mode (bits: %d, grayscale: %d)\n",
+                        info->var.bits_per_pixel, info->var.grayscale);
+                return -EINVAL;
+        }
+
+        /*
          * Dimensions
          */
 
@@ -410,6 +454,24 @@ static int auok190xfb_check_var(struct fb_var_screeninfo *var,
         return 0;
 }
 
+static int auok190xfb_set_fix(struct fb_info *info)
+{
+        struct fb_fix_screeninfo *fix = &info->fix;
+        struct fb_var_screeninfo *var = &info->var;
+
+        fix->line_length = var->xres_virtual * var->bits_per_pixel / 8;
+
+        fix->type = FB_TYPE_PACKED_PIXELS;
+        fix->accel = FB_ACCEL_NONE;
+        fix->visual = (var->grayscale) ? FB_VISUAL_STATIC_PSEUDOCOLOR
+                                       : FB_VISUAL_TRUECOLOR;
+        fix->xpanstep = 0;
+        fix->ypanstep = 0;
+        fix->ywrapstep = 0;
+
+        return 0;
+}
+
 static struct fb_ops auok190xfb_ops = {
         .owner          = THIS_MODULE,
         .fb_read        = fb_sys_read,
@@ -894,18 +956,8 @@ int auok190x_common_probe(struct platform_device *pdev,
         /* initialise fix, var, resolution and rotation */
 
         strlcpy(info->fix.id, init->id, 16);
-        info->fix.type = FB_TYPE_PACKED_PIXELS;
-        info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
-        info->fix.xpanstep = 0;
-        info->fix.ypanstep = 0;
-        info->fix.ywrapstep = 0;
-        info->fix.accel = FB_ACCEL_NONE;
-
         info->var.bits_per_pixel = 8;
         info->var.grayscale = 1;
-        info->var.red.length = 8;
-        info->var.green.length = 8;
-        info->var.blue.length = 8;
 
         panel = &panel_table[board->resolution];
 
@@ -933,8 +985,7 @@ int auok190x_common_probe(struct platform_device *pdev,
         if (ret)
                 goto err_defio;
 
-        info->fix.line_length = info->var.xres_virtual *
-                                info->var.bits_per_pixel / 8;
+        auok190xfb_set_fix(info);
 
         /* deferred io init */