| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * FB driver for the ILI9320 LCD Controller |
| * |
| * Copyright (C) 2013 Noralf Tronnes |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/spi/spi.h> |
| #include <linux/delay.h> |
| |
| #include "fbtft.h" |
| |
| #define DRVNAME "fb_ili9320" |
| #define WIDTH 240 |
| #define HEIGHT 320 |
| #define DEFAULT_GAMMA "07 07 6 0 0 0 5 5 4 0\n" \ |
| "07 08 4 7 5 1 2 0 7 7" |
| |
| static unsigned int read_devicecode(struct fbtft_par *par) |
| { |
| u8 rxbuf[8] = {0, }; |
| |
| write_reg(par, 0x0000); |
| par->fbtftops.read(par, rxbuf, 4); |
| return (rxbuf[2] << 8) | rxbuf[3]; |
| } |
| |
| static int init_display(struct fbtft_par *par) |
| { |
| unsigned int devcode; |
| |
| par->fbtftops.reset(par); |
| |
| devcode = read_devicecode(par); |
| fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "Device code: 0x%04X\n", |
| devcode); |
| if ((devcode != 0x0000) && (devcode != 0x9320)) |
| dev_warn(par->info->device, |
| "Unrecognized Device code: 0x%04X (expected 0x9320)\n", |
| devcode); |
| |
| /* Initialization sequence from ILI9320 Application Notes */ |
| |
| /* *********** Start Initial Sequence ********* */ |
| /* Set the Vcore voltage and this setting is must. */ |
| write_reg(par, 0x00E5, 0x8000); |
| |
| /* Start internal OSC. */ |
| write_reg(par, 0x0000, 0x0001); |
| |
| /* set SS and SM bit */ |
| write_reg(par, 0x0001, 0x0100); |
| |
| /* set 1 line inversion */ |
| write_reg(par, 0x0002, 0x0700); |
| |
| /* Resize register */ |
| write_reg(par, 0x0004, 0x0000); |
| |
| /* set the back and front porch */ |
| write_reg(par, 0x0008, 0x0202); |
| |
| /* set non-display area refresh cycle */ |
| write_reg(par, 0x0009, 0x0000); |
| |
| /* FMARK function */ |
| write_reg(par, 0x000A, 0x0000); |
| |
| /* RGB interface setting */ |
| write_reg(par, 0x000C, 0x0000); |
| |
| /* Frame marker Position */ |
| write_reg(par, 0x000D, 0x0000); |
| |
| /* RGB interface polarity */ |
| write_reg(par, 0x000F, 0x0000); |
| |
| /* ***********Power On sequence *************** */ |
| /* SAP, BT[3:0], AP, DSTB, SLP, STB */ |
| write_reg(par, 0x0010, 0x0000); |
| |
| /* DC1[2:0], DC0[2:0], VC[2:0] */ |
| write_reg(par, 0x0011, 0x0007); |
| |
| /* VREG1OUT voltage */ |
| write_reg(par, 0x0012, 0x0000); |
| |
| /* VDV[4:0] for VCOM amplitude */ |
| write_reg(par, 0x0013, 0x0000); |
| |
| /* Dis-charge capacitor power voltage */ |
| mdelay(200); |
| |
| /* SAP, BT[3:0], AP, DSTB, SLP, STB */ |
| write_reg(par, 0x0010, 0x17B0); |
| |
| /* R11h=0x0031 at VCI=3.3V DC1[2:0], DC0[2:0], VC[2:0] */ |
| write_reg(par, 0x0011, 0x0031); |
| mdelay(50); |
| |
| /* R12h=0x0138 at VCI=3.3V VREG1OUT voltage */ |
| write_reg(par, 0x0012, 0x0138); |
| mdelay(50); |
| |
| /* R13h=0x1800 at VCI=3.3V VDV[4:0] for VCOM amplitude */ |
| write_reg(par, 0x0013, 0x1800); |
| |
| /* R29h=0x0008 at VCI=3.3V VCM[4:0] for VCOMH */ |
| write_reg(par, 0x0029, 0x0008); |
| mdelay(50); |
| |
| /* GRAM horizontal Address */ |
| write_reg(par, 0x0020, 0x0000); |
| |
| /* GRAM Vertical Address */ |
| write_reg(par, 0x0021, 0x0000); |
| |
| /* ------------------ Set GRAM area --------------- */ |
| /* Horizontal GRAM Start Address */ |
| write_reg(par, 0x0050, 0x0000); |
| |
| /* Horizontal GRAM End Address */ |
| write_reg(par, 0x0051, 0x00EF); |
| |
| /* Vertical GRAM Start Address */ |
| write_reg(par, 0x0052, 0x0000); |
| |
| /* Vertical GRAM End Address */ |
| write_reg(par, 0x0053, 0x013F); |
| |
| /* Gate Scan Line */ |
| write_reg(par, 0x0060, 0x2700); |
| |
| /* NDL,VLE, REV */ |
| write_reg(par, 0x0061, 0x0001); |
| |
| /* set scrolling line */ |
| write_reg(par, 0x006A, 0x0000); |
| |
| /* -------------- Partial Display Control --------- */ |
| write_reg(par, 0x0080, 0x0000); |
| write_reg(par, 0x0081, 0x0000); |
| write_reg(par, 0x0082, 0x0000); |
| write_reg(par, 0x0083, 0x0000); |
| write_reg(par, 0x0084, 0x0000); |
| write_reg(par, 0x0085, 0x0000); |
| |
| /* -------------- Panel Control ------------------- */ |
| write_reg(par, 0x0090, 0x0010); |
| write_reg(par, 0x0092, 0x0000); |
| write_reg(par, 0x0093, 0x0003); |
| write_reg(par, 0x0095, 0x0110); |
| write_reg(par, 0x0097, 0x0000); |
| write_reg(par, 0x0098, 0x0000); |
| write_reg(par, 0x0007, 0x0173); /* 262K color and display ON */ |
| |
| return 0; |
| } |
| |
| static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) |
| { |
| switch (par->info->var.rotate) { |
| /* R20h = Horizontal GRAM Start Address */ |
| /* R21h = Vertical GRAM Start Address */ |
| case 0: |
| write_reg(par, 0x0020, xs); |
| write_reg(par, 0x0021, ys); |
| break; |
| case 180: |
| write_reg(par, 0x0020, WIDTH - 1 - xs); |
| write_reg(par, 0x0021, HEIGHT - 1 - ys); |
| break; |
| case 270: |
| write_reg(par, 0x0020, WIDTH - 1 - ys); |
| write_reg(par, 0x0021, xs); |
| break; |
| case 90: |
| write_reg(par, 0x0020, ys); |
| write_reg(par, 0x0021, HEIGHT - 1 - xs); |
| break; |
| } |
| write_reg(par, 0x0022); /* Write Data to GRAM */ |
| } |
| |
| static int set_var(struct fbtft_par *par) |
| { |
| switch (par->info->var.rotate) { |
| case 0: |
| write_reg(par, 0x3, (par->bgr << 12) | 0x30); |
| break; |
| case 270: |
| write_reg(par, 0x3, (par->bgr << 12) | 0x28); |
| break; |
| case 180: |
| write_reg(par, 0x3, (par->bgr << 12) | 0x00); |
| break; |
| case 90: |
| write_reg(par, 0x3, (par->bgr << 12) | 0x18); |
| break; |
| } |
| return 0; |
| } |
| |
| /* |
| * Gamma string format: |
| * VRP0 VRP1 RP0 RP1 KP0 KP1 KP2 KP3 KP4 KP5 |
| * VRN0 VRN1 RN0 RN1 KN0 KN1 KN2 KN3 KN4 KN5 |
| */ |
| #define CURVE(num, idx) curves[(num) * par->gamma.num_values + (idx)] |
| static int set_gamma(struct fbtft_par *par, u32 *curves) |
| { |
| static const unsigned long mask[] = { |
| 0x1f, 0x1f, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, |
| 0x1f, 0x1f, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, |
| }; |
| int i, j; |
| |
| /* apply mask */ |
| for (i = 0; i < 2; i++) |
| for (j = 0; j < 10; j++) |
| CURVE(i, j) &= mask[i * par->gamma.num_values + j]; |
| |
| write_reg(par, 0x0030, CURVE(0, 5) << 8 | CURVE(0, 4)); |
| write_reg(par, 0x0031, CURVE(0, 7) << 8 | CURVE(0, 6)); |
| write_reg(par, 0x0032, CURVE(0, 9) << 8 | CURVE(0, 8)); |
| write_reg(par, 0x0035, CURVE(0, 3) << 8 | CURVE(0, 2)); |
| write_reg(par, 0x0036, CURVE(0, 1) << 8 | CURVE(0, 0)); |
| |
| write_reg(par, 0x0037, CURVE(1, 5) << 8 | CURVE(1, 4)); |
| write_reg(par, 0x0038, CURVE(1, 7) << 8 | CURVE(1, 6)); |
| write_reg(par, 0x0039, CURVE(1, 9) << 8 | CURVE(1, 8)); |
| write_reg(par, 0x003C, CURVE(1, 3) << 8 | CURVE(1, 2)); |
| write_reg(par, 0x003D, CURVE(1, 1) << 8 | CURVE(1, 0)); |
| |
| return 0; |
| } |
| |
| #undef CURVE |
| |
| static struct fbtft_display display = { |
| .regwidth = 16, |
| .width = WIDTH, |
| .height = HEIGHT, |
| .gamma_num = 2, |
| .gamma_len = 10, |
| .gamma = DEFAULT_GAMMA, |
| .fbtftops = { |
| .init_display = init_display, |
| .set_addr_win = set_addr_win, |
| .set_var = set_var, |
| .set_gamma = set_gamma, |
| }, |
| }; |
| |
| FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9320", &display); |
| |
| MODULE_ALIAS("spi:" DRVNAME); |
| MODULE_ALIAS("platform:" DRVNAME); |
| MODULE_ALIAS("spi:ili9320"); |
| MODULE_ALIAS("platform:ili9320"); |
| |
| MODULE_DESCRIPTION("FB driver for the ILI9320 LCD Controller"); |
| MODULE_AUTHOR("Noralf Tronnes"); |
| MODULE_LICENSE("GPL"); |