| // 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"); |