-vis: On S3c2410x Delta Driver -
For modern engineers maintaining legacy S3C2410X products, the provided analysis and code skeleton serve as a roadmap to either revive the original -vis functionality or safely migrate it to a newer kernel using the IIO framework. Always consult the S3C2410X user manual (revision 1.2) and the specific Delta peripheral's datasheet—timing mismatches between the two are the primary source of "ghost touches" or video corruption.
static int delta_irq = IRQ_EINT11; static int delta_data_pin = S3C2410_GPG(10);
static long vis_delta_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) struct vis_delta_device *vis = filp->private_data; switch(cmd) case VIS_SET_BRIGHTNESS: // Map Delta-sigma value to LCD PWM writel(arg, vis->reg_base + S3C2410_LCDCON5); break; case VIS_GET_TOUCH_RAW: copy_to_user((void __user *)arg, vis->delta_sigma_samples, sizeof(vis->delta_sigma_samples)); break; -vis On S3c2410x Delta Driver -
Use case: .
module_platform_driver(vis_delta_driver); if (bit_count >
if (bit_count >= OSR) vis->delta_sigma_samples[current_index++] = accum / OSR; if (current_index >= BUFFER_SIZE) wake_up_interruptible(&vis->wait); accum = 0; bit_count = 0;
// Request GPIO ret = gpio_request(delta_data_pin, "delta_data"); if (ret) return ret; s3c_gpio_cfgpin(delta_data_pin, S3C_GPIO_SFN(0x0)); // Input s3c_gpio_setpull(delta_data_pin, S3C_GPIO_PULL_UP); = OSR) vis->
Introduction The Samsung S3C2410X is a legendary 16/32-bit RISC microcontroller based on the ARM920T core. Despite its age (released in the early 2000s), it remains a cornerstone for embedded systems education (e.g., the popular QQ2440, Mini2440 boards) and legacy industrial control devices. One of the most challenging aspects of working with this SoC is interfacing non-standard peripherals, particularly those referred to under the codename -vis and its accompanying Delta signal conditioning interface.