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215 lines
5.4 KiB
215 lines
5.4 KiB
// SPDX-License-Identifier: GPL-2.0+
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/*
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* FB driver for the ST7789V LCD Controller
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*
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* Copyright (C) 2015 Dennis Menschel
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*/
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#include <linux/bitops.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <video/mipi_display.h>
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#include "fbtft.h"
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#define DRVNAME "fb_st7789v"
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static unsigned int width;
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module_param(width, uint, 0000);
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MODULE_PARM_DESC(width, "Display width");
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static unsigned int height;
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module_param(height, uint, 0000);
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MODULE_PARM_DESC(height, "Display height");
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static u32 col_offset = 0;
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static u32 row_offset = 0;
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static u8 col_hack_fix_offset = 0;
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static short x_offset = 0;
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static short y_offset = 0;
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#define ST77XX_MADCTL_MY 0x80
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#define ST77XX_MADCTL_MX 0x40
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#define ST77XX_MADCTL_MV 0x20
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#define ST77XX_MADCTL_ML 0x10
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#define ST77XX_MADCTL_BGR 0x08
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#define ST77XX_MADCTL_RGB 0x00
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#define DEFAULT_GAMMA \
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"70 2C 2E 15 10 09 48 33 53 0B 19 18 20 25\n" \
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"70 2C 2E 15 10 09 48 33 53 0B 19 18 20 25"
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/**
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* enum st7789v_command - ST7789V display controller commands
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*
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* @PORCTRL: porch setting
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* @GCTRL: gate control
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* @VCOMS: VCOM setting
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* @VDVVRHEN: VDV and VRH command enable
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* @VRHS: VRH set
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* @VDVS: VDV set
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* @VCMOFSET: VCOM offset set
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* @PWCTRL1: power control 1
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* @PVGAMCTRL: positive voltage gamma control
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* @NVGAMCTRL: negative voltage gamma control
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*
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* The command names are the same as those found in the datasheet to ease
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* looking up their semantics and usage.
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*
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* Note that the ST7789V display controller offers quite a few more commands
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* which have been omitted from this list as they are not used at the moment.
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* Furthermore, commands that are compliant with the MIPI DCS have been left
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* out as well to avoid duplicate entries.
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*/
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enum st7789v_command {
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PORCTRL = 0xB2,
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GCTRL = 0xB7,
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VCOMS = 0xBB,
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VDVVRHEN = 0xC2,
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VRHS = 0xC3,
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VDVS = 0xC4,
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VCMOFSET = 0xC5,
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PWCTRL1 = 0xD0,
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PVGAMCTRL = 0xE0,
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NVGAMCTRL = 0xE1,
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};
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/**
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* init_display() - initialize the display controller
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*
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* @par: FBTFT parameter object
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*
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* Most of the commands in this init function set their parameters to the
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* same default values which are already in place after the display has been
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* powered up. (The main exception to this rule is the pixel format which
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* would default to 18 instead of 16 bit per pixel.)
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* Nonetheless, this sequence can be used as a template for concrete
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* displays which usually need some adjustments.
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*
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* Return: 0 on success, < 0 if error occurred.
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*/
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static int init_display(struct fbtft_par *par)
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{
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printk(KERN_INFO "ST7789 adafruit fbtft driver\n");
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width = par->info->var.xres;
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height = par->info->var.yres;
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if ((width == 0) || (width > 240)) {
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width = 240;
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}
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if ((height == 0) || (height > 320)) {
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height = 320;
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}
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printk(KERN_INFO "Size: (%d, %d)\n", width, height);
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// Go to sleep
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write_reg(par, MIPI_DCS_SET_DISPLAY_OFF);
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// Soft reset
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write_reg(par, MIPI_DCS_SOFT_RESET);
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mdelay(150);
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/* turn off sleep mode */
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write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
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mdelay(10);
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/* set pixel format to RGB-565 */
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write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);
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write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0);
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write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS, 0, 0, 0, 240);
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write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS, 0, 0, 320>>8, 320&0xFF);
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write_reg(par, MIPI_DCS_ENTER_INVERT_MODE); // odd hack, displays are inverted
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write_reg(par, MIPI_DCS_ENTER_NORMAL_MODE);
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mdelay(10);
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write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
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return 0;
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}
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/**
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* set_var() - apply LCD properties like rotation and BGR mode
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*
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* @par: FBTFT parameter object
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*
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* Return: 0 on success, < 0 if error occurred.
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*/
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static int set_var(struct fbtft_par *par)
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{
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u8 addr_mode = 0;
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switch (par->info->var.rotate) {
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case 0:
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addr_mode = 0;
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x_offset = col_offset;
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y_offset = row_offset;
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break;
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case 90:
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addr_mode = ST77XX_MADCTL_MV | ST77XX_MADCTL_MX;
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x_offset = row_offset;
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y_offset = col_offset;
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break;
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case 180:
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addr_mode = ST77XX_MADCTL_MX | ST77XX_MADCTL_MY;
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x_offset = (240 - width) - col_offset + col_hack_fix_offset;
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// hack tweak to account for extra pixel width to make even
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y_offset = (320 - height) - row_offset;
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break;
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case 270:
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addr_mode = ST77XX_MADCTL_MV | ST77XX_MADCTL_MY;
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x_offset = (320 - height) - row_offset;
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y_offset = (240 - width) - col_offset;
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break;
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default:
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return -EINVAL;
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}
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printk(KERN_INFO "Rotation %d offsets %d %d\n", par->info->var.rotate, x_offset, y_offset);
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write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
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return 0;
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}
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/**
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* blank() - blank the display
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*
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* @par: FBTFT parameter object
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* @on: whether to enable or disable blanking the display
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*
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* Return: 0 on success, < 0 if error occurred.
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*/
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static int blank(struct fbtft_par *par, bool on)
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{
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if (on)
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write_reg(par, MIPI_DCS_SET_DISPLAY_OFF);
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else
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write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
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return 0;
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}
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static struct fbtft_display display = {
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.regwidth = 8,
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.width = 240,
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.height = 320,
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.gamma_num = 2,
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.gamma_len = 14,
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.gamma = DEFAULT_GAMMA,
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.fbtftops = {
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.init_display = init_display,
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.set_var = set_var,
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.blank = blank,
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},
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};
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FBTFT_REGISTER_DRIVER(DRVNAME, "sitronix,st7789v", &display);
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MODULE_ALIAS("spi:" DRVNAME);
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MODULE_ALIAS("platform:" DRVNAME);
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MODULE_ALIAS("spi:st7789v");
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MODULE_ALIAS("platform:st7789v");
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MODULE_DESCRIPTION("FB driver for the ST7789V LCD Controller");
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MODULE_AUTHOR("Dennis Menschel");
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MODULE_LICENSE("GPL");
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