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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 | /* * FB driver for the SH1106 OLED Controller * Based on the SSD1306 driver by Noralf Tronnes * * Copyright (C) 2017 Heiner Kallweit * * 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/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/gpio.h> #include <linux/delay.h> #include "fbtft.h" #define DRVNAME "fb_sh1106" #define WIDTH 128 #define HEIGHT 64 /* Init sequence based on the Adafruit SSD1306 Arduino library */ static int init_display(struct fbtft_par *par) { if (!par->info->var.xres || par->info->var.xres > WIDTH || !par->info->var.yres || par->info->var.yres > HEIGHT || par->info->var.yres % 8) { dev_err(par->info->device, "Invalid screen size\n"); return -EINVAL; } if (par->info->var.rotate) { dev_err(par->info->device, "Display rotation not supported\n"); return -EINVAL; } par->fbtftops.reset(par); /* Set Display OFF */ write_reg(par, 0xAE); /* Set Display Clock Divide Ratio/ Oscillator Frequency */ write_reg(par, 0xD5, 0x80); /* Set Multiplex Ratio */ write_reg(par, 0xA8, par->info->var.yres - 1); /* Set Display Offset */ write_reg(par, 0xD3, 0x00); /* Set Display Start Line */ write_reg(par, 0x40 | 0x0); /* Set Segment Re-map */ /* column address 127 is mapped to SEG0 */ write_reg(par, 0xA0 | 0x1); /* Set COM Output Scan Direction */ /* remapped mode. Scan from COM[N-1] to COM0 */ write_reg(par, 0xC8); /* Set COM Pins Hardware Configuration */ if (par->info->var.yres == 64) /* A[4]=1b, Alternative COM pin configuration */ write_reg(par, 0xDA, 0x12); else if (par->info->var.yres == 48) /* A[4]=1b, Alternative COM pin configuration */ write_reg(par, 0xDA, 0x12); else /* A[4]=0b, Sequential COM pin configuration */ write_reg(par, 0xDA, 0x02); /* Set Pre-charge Period */ write_reg(par, 0xD9, 0xF1); /* Set VCOMH Deselect Level */ write_reg(par, 0xDB, 0x40); /* Set Display ON */ write_reg(par, 0xAF); msleep(150); return 0; } static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) { } static int blank(struct fbtft_par *par, bool on) { fbtft_par_dbg(DEBUG_BLANK, par, "%s(blank=%s)\n", __func__, on ? "true" : "false"); write_reg(par, on ? 0xAE : 0xAF); return 0; } /* Gamma is used to control Contrast */ static int set_gamma(struct fbtft_par *par, u32 *curves) { /* apply mask */ curves[0] &= 0xFF; /* Set Contrast Control for BANK0 */ write_reg(par, 0x81, curves[0]); return 0; } static int write_vmem(struct fbtft_par *par, size_t offset, size_t len) { u16 *vmem16 = (u16 *)par->info->screen_buffer; u32 xres = par->info->var.xres; int page, page_start, page_end, x, i, ret; u8 *buf = par->txbuf.buf; /* offset refers to vmem with 2 bytes element size */ page_start = offset / (8 * 2 * xres); page_end = DIV_ROUND_UP(offset + len, 8 * 2 * xres); for (page = page_start; page < page_end; page++) { /* set page and set column to 2 because of vidmem width 132 */ write_reg(par, 0xb0 | page, 0x00 | 2, 0x10 | 0); memset(buf, 0, xres); for (x = 0; x < xres; x++) for (i = 0; i < 8; i++) if (vmem16[(page * 8 + i) * xres + x]) buf[x] |= BIT(i); /* Write data */ ret = fbtft_write_buf_dc(par, buf, xres, 1); if (ret < 0) return ret; } return 0; } static void write_register(struct fbtft_par *par, int len, ...) { va_list args; int i; va_start(args, len); for (i = 0; i < len; i++) par->buf[i] = va_arg(args, unsigned int); /* keep DC low for all command bytes to transfer */ fbtft_write_buf_dc(par, par->buf, len, 0); va_end(args); } static struct fbtft_display display = { .regwidth = 8, .width = WIDTH, .height = HEIGHT, .txbuflen = WIDTH, .gamma_num = 1, .gamma_len = 1, /* set default contrast to 0xcd = 80% */ .gamma = "cd", .fbtftops = { .write_vmem = write_vmem, .write_register = write_register, .init_display = init_display, .set_addr_win = set_addr_win, .blank = blank, .set_gamma = set_gamma, }, }; FBTFT_REGISTER_DRIVER(DRVNAME, "sinowealth,sh1106", &display); MODULE_ALIAS("spi:" DRVNAME); MODULE_ALIAS("platform:" DRVNAME); MODULE_ALIAS("spi:sh1106"); MODULE_ALIAS("platform:sh1106"); MODULE_DESCRIPTION("SH1106 OLED Driver"); MODULE_AUTHOR("Heiner Kallweit"); MODULE_LICENSE("GPL"); |