staging: fbtft: add support for ST7789V display controller (d4c402ff) · Commits · 戴 / test

drivers/staging/fbtft/Kconfig

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		@@ -141,6 +141,16 @@ config FB_TFT_ST7735R
		help
		Generic Framebuffer support for ST7735R

		config FB_TFT_ST7789V
		tristate "FB driver for the ST7789V LCD Controller"
		depends on FB_TFT
		help
		This enables generic framebuffer support for the Sitronix ST7789V
		display controller. The controller is intended for small color
		displays with a resolution of up to 320x240 pixels.

		Say Y if you have such a display that utilizes this controller.

		config FB_TFT_TINYLCD
		tristate "FB driver for tinylcd.com display"
		depends on FB_TFT

drivers/staging/fbtft/Makefile

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		@@ -25,6 +25,7 @@ obj-$(CONFIG_FB_TFT_SSD1306) += fb_ssd1306.o
		obj-$(CONFIG_FB_TFT_SSD1331) += fb_ssd1331.o
		obj-$(CONFIG_FB_TFT_SSD1351) += fb_ssd1351.o
		obj-$(CONFIG_FB_TFT_ST7735R) += fb_st7735r.o
		obj-$(CONFIG_FB_TFT_ST7789V) += fb_st7789v.o
		obj-$(CONFIG_FB_TFT_TINYLCD) += fb_tinylcd.o
		obj-$(CONFIG_FB_TFT_TLS8204) += fb_tls8204.o
		obj-$(CONFIG_FB_TFT_UC1611) += fb_uc1611.o

drivers/staging/fbtft/fb_st7789v.c

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		/*
		* FB driver for the ST7789V LCD Controller
		*
		* Copyright (C) 2015 Dennis Menschel
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*/

		#include <linux/bitops.h>
		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/module.h>

		#include "fbtft.h"

		#define DRVNAME "fb_st7789v"

		#define DEFAULT_GAMMA \
		"70 2C 2E 15 10 09 48 33 53 0B 19 18 20 25\n" \
		"70 2C 2E 15 10 09 48 33 53 0B 19 18 20 25"

		/**
		* enum st7789v_command - ST7789V display controller commands
		*
		* @SLPOUT: sleep out
		* @DISPOFF: display off
		* @DISPON: display on
		* @CASET: column address set
		* @RASET: row address set
		* @RAMRW: memory write
		* @MADCTL: memory data access control
		* @COLMOD: interface pixel format
		* @PORCTRL: porch setting
		* @GCTRL: gate control
		* @VCOMS: VCOM setting
		* @VDVVRHEN: VDV and VRH command enable
		* @VRHS: VRH set
		* @VDVS: VDV set
		* @VCMOFSET: VCOM offset set
		* @PWCTRL1: power control 1
		* @PVGAMCTRL: positive voltage gamma control
		* @NVGAMCTRL: negative voltage gamma control
		*
		* The command names are the same as those found in the datasheet to ease
		* looking up their semantics and usage.
		*
		* Note that the ST7789V display controller offers quite a few more commands
		* which have been omitted from this list as they are not used at the moment.
		*/
		enum st7789v_command {
		SLPOUT = 0x11,
		DISPOFF = 0x28,
		DISPON = 0x29,
		CASET = 0x2A,
		RASET = 0x2B,
		RAMRW = 0x2C,
		MADCTL = 0x36,
		COLMOD = 0x3A,
		PORCTRL = 0xB2,
		GCTRL = 0xB7,
		VCOMS = 0xBB,
		VDVVRHEN = 0xC2,
		VRHS = 0xC3,
		VDVS = 0xC4,
		VCMOFSET = 0xC5,
		PWCTRL1 = 0xD0,
		PVGAMCTRL = 0xE0,
		NVGAMCTRL = 0xE1,
		};

		#define MADCTL_BGR BIT(3) /* bitmask for RGB/BGR order */
		#define MADCTL_MV BIT(5) /* bitmask for page/column order */
		#define MADCTL_MX BIT(6) /* bitmask for column address order */
		#define MADCTL_MY BIT(7) /* bitmask for page address order */

		/**
		* default_init_sequence - default initialization sequence for ST7789V
		*
		* Most of the commands in this init sequence set their parameters to the
		* same default values which are already in place after the display has been
		* powered up. (The main exception to this rule is the pixel format which
		* would default to 18 instead of 16 bit per pixel.)
		* Nonetheless, this sequence can be used as a template for concrete
		* displays which usually need some adjustments.
		*/
		static int default_init_sequence[] = {
		/* turn off sleep mode */
		-1, SLPOUT,
		-2, 120,

		/* set pixel format to RGB-565 */
		-1, COLMOD, 0x05,

		-1, PORCTRL, 0x08, 0x08, 0x00, 0x22, 0x22,

		/*
		* VGH = 13.26V
		* VGL = -10.43V
		*/
		-1, GCTRL, 0x35,

		/*
		* VDV and VRH register values come from command write
		* (instead of NVM)
		*/
		-1, VDVVRHEN, 0x01, 0xFF,

		/*
		* VAP = 4.1V + (VCOM + VCOM offset + 0.5 * VDV)
		* VAN = -4.1V + (VCOM + VCOM offset + 0.5 * VDV)
		*/
		-1, VRHS, 0x0B,

		/* VDV = 0V */
		-1, VDVS, 0x20,

		/* VCOM = 0.9V */
		-1, VCOMS, 0x20,

		/* VCOM offset = 0V */
		-1, VCMOFSET, 0x20,

		/*
		* AVDD = 6.8V
		* AVCL = -4.8V
		* VDS = 2.3V
		*/
		-1, PWCTRL1, 0xA4, 0xA1,

		-1, DISPON,

		-3,
		};

		/**
		* set_addr_win() - configure display area to use
		*
		* @par: FBTFT parameter object
		* @xs: first active pixel of x-axis
		* @ys: first active pixel of y-axis
		* @xe: last active pixel of x-axis
		* @ye: last active pixel of y-axis
		*/
		static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
		{
		write_reg(par, CASET, xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
		write_reg(par, RASET, ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
		write_reg(par, RAMRW);
		}

		/**
		* set_var() - apply LCD properties like rotation and BGR mode
		*
		* @par: FBTFT parameter object
		*
		* Return: 0 on success, < 0 if error occurred.
		*/
		static int set_var(struct fbtft_par *par)
		{
		u8 madctl_par = 0;

		if (par->bgr)
		madctl_par \|= MADCTL_BGR;
		switch (par->info->var.rotate) {
		case 0:
		break;
		case 90:
		madctl_par \|= (MADCTL_MV \| MADCTL_MY);
		break;
		case 180:
		madctl_par \|= (MADCTL_MX \| MADCTL_MY);
		break;
		case 270:
		madctl_par \|= (MADCTL_MV \| MADCTL_MX);
		break;
		default:
		return -EINVAL;
		}
		write_reg(par, MADCTL, madctl_par);
		return 0;
		}

		/**
		* set_gamma() - set gamma curves
		*
		* @par: FBTFT parameter object
		* @curves: gamma curves
		*
		* Before the gamma curves are applied, they are preprocessed with a bitmask
		* to ensure syntactically correct input for the display controller.
		* This implies that the curves input parameter might be changed by this
		* function and that illegal gamma values are auto-corrected and not
		* reported as errors.
		*
		* Return: 0 on success, < 0 if error occurred.
		*/
		static int set_gamma(struct fbtft_par par, unsigned long curves)
		{
		int i;
		int j;
		int c; /* curve index offset */

		/*
		* Bitmasks for gamma curve command parameters.
		* The masks are the same for both positive and negative voltage
		* gamma curves.
		*/
		const u8 gamma_par_mask[] = {
		0xFF, /* V63[3:0], V0[3:0]*/
		0x3F, /* V1[5:0] */
		0x3F, /* V2[5:0] */
		0x1F, /* V4[4:0] */
		0x1F, /* V6[4:0] */
		0x3F, /* J0[1:0], V13[3:0] */
		0x7F, /* V20[6:0] */
		0x77, /* V36[2:0], V27[2:0] */
		0x7F, /* V43[6:0] */
		0x3F, /* J1[1:0], V50[3:0] */
		0x1F, /* V57[4:0] */
		0x1F, /* V59[4:0] */
		0x3F, /* V61[5:0] */
		0x3F, /* V62[5:0] */
		};

		for (i = 0; i < par->gamma.num_curves; i++) {
		c = i * par->gamma.num_values;
		for (j = 0; j < par->gamma.num_values; j++)
		curves[c + j] &= gamma_par_mask[j];
		write_reg(
		par, PVGAMCTRL + i,
		curves[c + 0], curves[c + 1], curves[c + 2],
		curves[c + 3], curves[c + 4], curves[c + 5],
		curves[c + 6], curves[c + 7], curves[c + 8],
		curves[c + 9], curves[c + 10], curves[c + 11],
		curves[c + 12], curves[c + 13]);
		}
		return 0;
		}

		/**
		* blank() - blank the display
		*
		* @par: FBTFT parameter object
		* @on: whether to enable or disable blanking the display
		*
		* Return: 0 on success, < 0 if error occurred.
		*/
		static int blank(struct fbtft_par *par, bool on)
		{
		if (on)
		write_reg(par, DISPOFF);
		else
		write_reg(par, DISPON);
		return 0;
		}

		static struct fbtft_display display = {
		.regwidth = 8,
		.width = 240,
		.height = 320,
		.init_sequence = default_init_sequence,
		.gamma_num = 2,
		.gamma_len = 14,
		.gamma = DEFAULT_GAMMA,
		.fbtftops = {
		.set_addr_win = set_addr_win,
		.set_var = set_var,
		.set_gamma = set_gamma,
		.blank = blank,
		},
		};

		FBTFT_REGISTER_DRIVER(DRVNAME, "sitronix,st7789v", &display);

		MODULE_ALIAS("spi:" DRVNAME);
		MODULE_ALIAS("platform:" DRVNAME);
		MODULE_ALIAS("spi:st7789v");
		MODULE_ALIAS("platform:st7789v");

		MODULE_DESCRIPTION("FB driver for the ST7789V LCD Controller");
		MODULE_AUTHOR("Dennis Menschel");
		MODULE_LICENSE("GPL");

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