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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 | // SPDX-License-Identifier: GPL-2.0 #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/gpio/consumer.h> #include <linux/spi/spi.h> #include <linux/delay.h> #include "fbtft.h" #define DRVNAME "fb_ssd1331" #define WIDTH 96 #define HEIGHT 64 #define GAMMA_NUM 1 #define GAMMA_LEN 63 #define DEFAULT_GAMMA "0 2 2 2 2 2 2 2 " \ "2 2 2 2 2 2 2 2 " \ "2 2 2 2 2 2 2 2 " \ "2 2 2 2 2 2 2 2 " \ "2 2 2 2 2 2 2 2 " \ "2 2 2 2 2 2 2 2 " \ "2 2 2 2 2 2 2 2 " \ "2 2 2 2 2 2 2" \ static int init_display(struct fbtft_par *par) { par->fbtftops.reset(par); write_reg(par, 0xae); /* Display Off */ /* Set Column Address Mapping, COM Scan Direction and Colour Depth */ if (par->info->var.rotate == 180) write_reg(par, 0xa0, 0x60 | (par->bgr << 2)); else write_reg(par, 0xa0, 0x72 | (par->bgr << 2)); write_reg(par, 0x72); /* RGB colour */ write_reg(par, 0xa1, 0x00); /* Set Display Start Line */ write_reg(par, 0xa2, 0x00); /* Set Display Offset */ write_reg(par, 0xa4); /* NORMALDISPLAY */ write_reg(par, 0xa8, 0x3f); /* Set multiplex */ write_reg(par, 0xad, 0x8e); /* Set master */ /* write_reg(par, 0xb0, 0x0b); Set power mode */ write_reg(par, 0xb1, 0x31); /* Precharge */ write_reg(par, 0xb3, 0xf0); /* Clock div */ write_reg(par, 0x8a, 0x64); /* Precharge A */ write_reg(par, 0x8b, 0x78); /* Precharge B */ write_reg(par, 0x8c, 0x64); /* Precharge C */ write_reg(par, 0xbb, 0x3a); /* Precharge level */ write_reg(par, 0xbe, 0x3e); /* vcomh */ write_reg(par, 0x87, 0x06); /* Master current */ write_reg(par, 0x81, 0x91); /* Contrast A */ write_reg(par, 0x82, 0x50); /* Contrast B */ write_reg(par, 0x83, 0x7d); /* Contrast C */ write_reg(par, 0xaf); /* Set Sleep Mode Display On */ return 0; } static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) { write_reg(par, 0x15, xs, xe); write_reg(par, 0x75, ys, ye); } static void write_reg8_bus8(struct fbtft_par *par, int len, ...) { va_list args; int i, ret; u8 *buf = par->buf; if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) { va_start(args, len); for (i = 0; i < len; i++) buf[i] = (u8)va_arg(args, unsigned int); va_end(args); fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, par->info->device, u8, buf, len, "%s: ", __func__); } va_start(args, len); *buf = (u8)va_arg(args, unsigned int); gpiod_set_value(par->gpio.dc, 0); ret = par->fbtftops.write(par, par->buf, sizeof(u8)); if (ret < 0) { va_end(args); dev_err(par->info->device, "write() failed and returned %d\n", ret); return; } len--; if (len) { i = len; while (i--) *buf++ = (u8)va_arg(args, unsigned int); ret = par->fbtftops.write(par, par->buf, len * (sizeof(u8))); if (ret < 0) { va_end(args); dev_err(par->info->device, "write() failed and returned %d\n", ret); return; } } gpiod_set_value(par->gpio.dc, 1); va_end(args); } /* * Grayscale Lookup Table * GS1 - GS63 * The driver Gamma curve contains the relative values between the entries * in the Lookup table. * * From datasheet: * 8.8 Gray Scale Decoder * * there are total 180 Gamma Settings (Setting 0 to Setting 180) * available for the Gray Scale table. * * The gray scale is defined in incremental way, with reference * to the length of previous table entry: * Setting of GS1 has to be >= 0 * Setting of GS2 has to be > Setting of GS1 +1 * Setting of GS3 has to be > Setting of GS2 +1 * : * Setting of GS63 has to be > Setting of GS62 +1 * */ static int set_gamma(struct fbtft_par *par, u32 *curves) { unsigned long tmp[GAMMA_NUM * GAMMA_LEN]; int i, acc = 0; for (i = 0; i < 63; i++) { if (i > 0 && curves[i] < 2) { dev_err(par->info->device, "Illegal value in Grayscale Lookup Table at index %d. Must be greater than 1\n", i); return -EINVAL; } acc += curves[i]; tmp[i] = acc; if (acc > 180) { dev_err(par->info->device, "Illegal value(s) in Grayscale Lookup Table. At index=%d, the accumulated value has exceeded 180\n", i); return -EINVAL; } } write_reg(par, 0xB8, tmp[0], tmp[1], tmp[2], tmp[3], tmp[4], tmp[5], tmp[6], tmp[7], tmp[8], tmp[9], tmp[10], tmp[11], tmp[12], tmp[13], tmp[14], tmp[15], tmp[16], tmp[17], tmp[18], tmp[19], tmp[20], tmp[21], tmp[22], tmp[23], tmp[24], tmp[25], tmp[26], tmp[27], tmp[28], tmp[29], tmp[30], tmp[31], tmp[32], tmp[33], tmp[34], tmp[35], tmp[36], tmp[37], tmp[38], tmp[39], tmp[40], tmp[41], tmp[42], tmp[43], tmp[44], tmp[45], tmp[46], tmp[47], tmp[48], tmp[49], tmp[50], tmp[51], tmp[52], tmp[53], tmp[54], tmp[55], tmp[56], tmp[57], tmp[58], tmp[59], tmp[60], tmp[61], tmp[62]); return 0; } static int blank(struct fbtft_par *par, bool on) { fbtft_par_dbg(DEBUG_BLANK, par, "(%s=%s)\n", __func__, on ? "true" : "false"); if (on) write_reg(par, 0xAE); else write_reg(par, 0xAF); return 0; } static struct fbtft_display display = { .regwidth = 8, .width = WIDTH, .height = HEIGHT, .gamma_num = GAMMA_NUM, .gamma_len = GAMMA_LEN, .gamma = DEFAULT_GAMMA, .fbtftops = { .write_register = write_reg8_bus8, .init_display = init_display, .set_addr_win = set_addr_win, .set_gamma = set_gamma, .blank = blank, }, }; FBTFT_REGISTER_DRIVER(DRVNAME, "solomon,ssd1331", &display); MODULE_ALIAS("spi:" DRVNAME); MODULE_ALIAS("platform:" DRVNAME); MODULE_ALIAS("spi:ssd1331"); MODULE_ALIAS("platform:ssd1331"); MODULE_DESCRIPTION("SSD1331 OLED Driver"); MODULE_AUTHOR("Alec Smecher (adapted from SSD1351 by James Davies)"); MODULE_LICENSE("GPL"); |