| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * FB driver for the ST7735R LCD Controller |
| * |
| * Copyright (C) 2013 Noralf Tronnes |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <video/mipi_display.h> |
| |
| #include "fbtft.h" |
| |
| #define DRVNAME "fb_st7735r" |
| #define DEFAULT_GAMMA "0F 1A 0F 18 2F 28 20 22 1F 1B 23 37 00 07 02 10\n" \ |
| "0F 1B 0F 17 33 2C 29 2E 30 30 39 3F 00 07 03 10" |
| |
| static const s16 default_init_sequence[] = { |
| -1, MIPI_DCS_SOFT_RESET, |
| -2, 150, /* delay */ |
| |
| -1, MIPI_DCS_EXIT_SLEEP_MODE, |
| -2, 500, /* delay */ |
| |
| /* FRMCTR1 - frame rate control: normal mode |
| * frame rate = fosc / (1 x 2 + 40) * (LINE + 2C + 2D) |
| */ |
| -1, 0xB1, 0x01, 0x2C, 0x2D, |
| |
| /* FRMCTR2 - frame rate control: idle mode |
| * frame rate = fosc / (1 x 2 + 40) * (LINE + 2C + 2D) |
| */ |
| -1, 0xB2, 0x01, 0x2C, 0x2D, |
| |
| /* FRMCTR3 - frame rate control - partial mode |
| * dot inversion mode, line inversion mode |
| */ |
| -1, 0xB3, 0x01, 0x2C, 0x2D, 0x01, 0x2C, 0x2D, |
| |
| /* INVCTR - display inversion control |
| * no inversion |
| */ |
| -1, 0xB4, 0x07, |
| |
| /* PWCTR1 - Power Control |
| * -4.6V, AUTO mode |
| */ |
| -1, 0xC0, 0xA2, 0x02, 0x84, |
| |
| /* PWCTR2 - Power Control |
| * VGH25 = 2.4C VGSEL = -10 VGH = 3 * AVDD |
| */ |
| -1, 0xC1, 0xC5, |
| |
| /* PWCTR3 - Power Control |
| * Opamp current small, Boost frequency |
| */ |
| -1, 0xC2, 0x0A, 0x00, |
| |
| /* PWCTR4 - Power Control |
| * BCLK/2, Opamp current small & Medium low |
| */ |
| -1, 0xC3, 0x8A, 0x2A, |
| |
| /* PWCTR5 - Power Control */ |
| -1, 0xC4, 0x8A, 0xEE, |
| |
| /* VMCTR1 - Power Control */ |
| -1, 0xC5, 0x0E, |
| |
| -1, MIPI_DCS_EXIT_INVERT_MODE, |
| |
| -1, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT, |
| |
| -1, MIPI_DCS_SET_DISPLAY_ON, |
| -2, 100, /* delay */ |
| |
| -1, MIPI_DCS_ENTER_NORMAL_MODE, |
| -2, 10, /* delay */ |
| |
| /* end marker */ |
| -3 |
| }; |
| |
| static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) |
| { |
| write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS, |
| xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF); |
| |
| write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS, |
| ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF); |
| |
| write_reg(par, MIPI_DCS_WRITE_MEMORY_START); |
| } |
| |
| #define MY BIT(7) |
| #define MX BIT(6) |
| #define MV BIT(5) |
| static int set_var(struct fbtft_par *par) |
| { |
| /* MADCTL - Memory data access control |
| * RGB/BGR: |
| * 1. Mode selection pin SRGB |
| * RGB H/W pin for color filter setting: 0=RGB, 1=BGR |
| * 2. MADCTL RGB bit |
| * RGB-BGR ORDER color filter panel: 0=RGB, 1=BGR |
| */ |
| switch (par->info->var.rotate) { |
| case 0: |
| write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, |
| MX | MY | (par->bgr << 3)); |
| break; |
| case 270: |
| write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, |
| MY | MV | (par->bgr << 3)); |
| break; |
| case 180: |
| write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, |
| par->bgr << 3); |
| break; |
| case 90: |
| write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, |
| MX | MV | (par->bgr << 3)); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Gamma string format: |
| * VRF0P VOS0P PK0P PK1P PK2P PK3P PK4P PK5P PK6P PK7P PK8P PK9P SELV0P SELV1P SELV62P SELV63P |
| * VRF0N VOS0N PK0N PK1N PK2N PK3N PK4N PK5N PK6N PK7N PK8N PK9N SELV0N SELV1N SELV62N SELV63N |
| */ |
| #define CURVE(num, idx) curves[(num) * par->gamma.num_values + (idx)] |
| static int set_gamma(struct fbtft_par *par, u32 *curves) |
| { |
| int i, j; |
| |
| /* apply mask */ |
| for (i = 0; i < par->gamma.num_curves; i++) |
| for (j = 0; j < par->gamma.num_values; j++) |
| CURVE(i, j) &= 0x3f; |
| |
| for (i = 0; i < par->gamma.num_curves; i++) |
| write_reg(par, 0xE0 + i, |
| CURVE(i, 0), CURVE(i, 1), |
| CURVE(i, 2), CURVE(i, 3), |
| CURVE(i, 4), CURVE(i, 5), |
| CURVE(i, 6), CURVE(i, 7), |
| CURVE(i, 8), CURVE(i, 9), |
| CURVE(i, 10), CURVE(i, 11), |
| CURVE(i, 12), CURVE(i, 13), |
| CURVE(i, 14), CURVE(i, 15)); |
| |
| return 0; |
| } |
| |
| #undef CURVE |
| |
| static struct fbtft_display display = { |
| .regwidth = 8, |
| .width = 128, |
| .height = 160, |
| .init_sequence = default_init_sequence, |
| .gamma_num = 2, |
| .gamma_len = 16, |
| .gamma = DEFAULT_GAMMA, |
| .fbtftops = { |
| .set_addr_win = set_addr_win, |
| .set_var = set_var, |
| .set_gamma = set_gamma, |
| }, |
| }; |
| |
| FBTFT_REGISTER_DRIVER(DRVNAME, "sitronix,st7735r", &display); |
| |
| MODULE_ALIAS("spi:" DRVNAME); |
| MODULE_ALIAS("platform:" DRVNAME); |
| MODULE_ALIAS("spi:st7735r"); |
| MODULE_ALIAS("platform:st7735r"); |
| |
| MODULE_DESCRIPTION("FB driver for the ST7735R LCD Controller"); |
| MODULE_AUTHOR("Noralf Tronnes"); |
| MODULE_LICENSE("GPL"); |