October 2017
Intermediate to advanced
586 pages
14h 8m
English
Content preview from Linux Device Drivers Development
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Checking information
The fb_ops->fb_check_var hook is responsible for checking framebuffer parameters. Its prototype is as follows:
int (*fb_check_var)(struct fb_var_screeninfo *var, struct fb_info *info);
This function should check framebuffer variable parameters and adjust to valid values. var represents the framebuffer variable parameters, which should be checked and adjusted:
static int myfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { if (var->xres_virtual < var->xres) var->xres_virtual = var->xres; if (var->yres_virtual < var->yres) var->yres_virtual = var->yres; if ((var->bits_per_pixel != 32) && (var->bits_per_pixel != 24) && (var->bits_per_pixel != 16) && (var->bits_per_pixel != 12) && (var->bits_per_pixel != ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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