| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * FB driver for the ILI9325 LCD Controller |
| * |
| * Copyright (C) 2013 Noralf Tronnes |
| * |
| * Based on ili9325.c by Jeroen Domburg |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/delay.h> |
| |
| #include "fbtft.h" |
| |
| #define DRVNAME "fb_ili9325" |
| #define WIDTH 240 |
| #define HEIGHT 320 |
| #define BPP 16 |
| #define FPS 20 |
| #define DEFAULT_GAMMA "0F 00 7 2 0 0 6 5 4 1\n" \ |
| "04 16 2 7 6 3 2 1 7 7" |
| |
| static unsigned int bt = 6; /* VGL=Vci*4 , VGH=Vci*4 */ |
| module_param(bt, uint, 0000); |
| MODULE_PARM_DESC(bt, "Sets the factor used in the step-up circuits"); |
| |
| static unsigned int vc = 0x03; /* Vci1=Vci*0.80 */ |
| module_param(vc, uint, 0000); |
| MODULE_PARM_DESC(vc, "Sets the ratio factor of Vci to generate the reference voltages Vci1"); |
| |
| static unsigned int vrh = 0x0d; /* VREG1OUT=Vci*1.85 */ |
| module_param(vrh, uint, 0000); |
| MODULE_PARM_DESC(vrh, "Set the amplifying rate (1.6 ~ 1.9) of Vci applied to output the VREG1OUT"); |
| |
| static unsigned int vdv = 0x12; /* VCOMH amplitude=VREG1OUT*0.98 */ |
| module_param(vdv, uint, 0000); |
| MODULE_PARM_DESC(vdv, "Select the factor of VREG1OUT to set the amplitude of Vcom"); |
| |
| static unsigned int vcm = 0x0a; /* VCOMH=VREG1OUT*0.735 */ |
| module_param(vcm, uint, 0000); |
| MODULE_PARM_DESC(vcm, "Set the internal VcomH voltage"); |
| |
| /* |
| * Verify that this configuration is within the Voltage limits |
| * |
| * Display module configuration: Vcc = IOVcc = Vci = 3.3V |
| * |
| * Voltages |
| * ---------- |
| * Vci = 3.3 |
| * Vci1 = Vci * 0.80 = 2.64 |
| * DDVDH = Vci1 * 2 = 5.28 |
| * VCL = -Vci1 = -2.64 |
| * VREG1OUT = Vci * 1.85 = 4.88 |
| * VCOMH = VREG1OUT * 0.735 = 3.59 |
| * VCOM amplitude = VREG1OUT * 0.98 = 4.79 |
| * VGH = Vci * 4 = 13.2 |
| * VGL = -Vci * 4 = -13.2 |
| * |
| * Limits |
| * -------- |
| * Power supplies |
| * 1.65 < IOVcc < 3.30 => 1.65 < 3.3 < 3.30 |
| * 2.40 < Vcc < 3.30 => 2.40 < 3.3 < 3.30 |
| * 2.50 < Vci < 3.30 => 2.50 < 3.3 < 3.30 |
| * |
| * Source/VCOM power supply voltage |
| * 4.50 < DDVDH < 6.0 => 4.50 < 5.28 < 6.0 |
| * -3.0 < VCL < -2.0 => -3.0 < -2.64 < -2.0 |
| * VCI - VCL < 6.0 => 5.94 < 6.0 |
| * |
| * Gate driver output voltage |
| * 10 < VGH < 20 => 10 < 13.2 < 20 |
| * -15 < VGL < -5 => -15 < -13.2 < -5 |
| * VGH - VGL < 32 => 26.4 < 32 |
| * |
| * VCOM driver output voltage |
| * VCOMH - VCOML < 6.0 => 4.79 < 6.0 |
| */ |
| |
| static int init_display(struct fbtft_par *par) |
| { |
| par->fbtftops.reset(par); |
| |
| bt &= 0x07; |
| vc &= 0x07; |
| vrh &= 0x0f; |
| vdv &= 0x1f; |
| vcm &= 0x3f; |
| |
| /* Initialization sequence from ILI9325 Application Notes */ |
| |
| /* ----------- Start Initial Sequence ----------- */ |
| write_reg(par, 0x00E3, 0x3008); /* Set internal timing */ |
| write_reg(par, 0x00E7, 0x0012); /* Set internal timing */ |
| write_reg(par, 0x00EF, 0x1231); /* Set internal timing */ |
| write_reg(par, 0x0001, 0x0100); /* set SS and SM bit */ |
| write_reg(par, 0x0002, 0x0700); /* set 1 line inversion */ |
| write_reg(par, 0x0004, 0x0000); /* Resize register */ |
| write_reg(par, 0x0008, 0x0207); /* set the back porch and front porch */ |
| write_reg(par, 0x0009, 0x0000); /* set non-display area refresh cycle */ |
| write_reg(par, 0x000A, 0x0000); /* FMARK function */ |
| write_reg(par, 0x000C, 0x0000); /* RGB interface setting */ |
| write_reg(par, 0x000D, 0x0000); /* Frame marker Position */ |
| write_reg(par, 0x000F, 0x0000); /* RGB interface polarity */ |
| |
| /* ----------- Power On sequence ----------- */ |
| write_reg(par, 0x0010, 0x0000); /* SAP, BT[3:0], AP, DSTB, SLP, STB */ |
| write_reg(par, 0x0011, 0x0007); /* DC1[2:0], DC0[2:0], VC[2:0] */ |
| write_reg(par, 0x0012, 0x0000); /* VREG1OUT voltage */ |
| write_reg(par, 0x0013, 0x0000); /* VDV[4:0] for VCOM amplitude */ |
| mdelay(200); /* Dis-charge capacitor power voltage */ |
| write_reg(par, 0x0010, /* SAP, BT[3:0], AP, DSTB, SLP, STB */ |
| BIT(12) | (bt << 8) | BIT(7) | BIT(4)); |
| write_reg(par, 0x0011, 0x220 | vc); /* DC1[2:0], DC0[2:0], VC[2:0] */ |
| mdelay(50); /* Delay 50ms */ |
| write_reg(par, 0x0012, vrh); /* Internal reference voltage= Vci; */ |
| mdelay(50); /* Delay 50ms */ |
| write_reg(par, 0x0013, vdv << 8); /* Set VDV[4:0] for VCOM amplitude */ |
| write_reg(par, 0x0029, vcm); /* Set VCM[5:0] for VCOMH */ |
| write_reg(par, 0x002B, 0x000C); /* Set Frame Rate */ |
| mdelay(50); /* Delay 50ms */ |
| write_reg(par, 0x0020, 0x0000); /* GRAM horizontal Address */ |
| write_reg(par, 0x0021, 0x0000); /* GRAM Vertical Address */ |
| |
| /*------------------ Set GRAM area --------------- */ |
| write_reg(par, 0x0050, 0x0000); /* Horizontal GRAM Start Address */ |
| write_reg(par, 0x0051, 0x00EF); /* Horizontal GRAM End Address */ |
| write_reg(par, 0x0052, 0x0000); /* Vertical GRAM Start Address */ |
| write_reg(par, 0x0053, 0x013F); /* Vertical GRAM Start Address */ |
| write_reg(par, 0x0060, 0xA700); /* Gate Scan Line */ |
| write_reg(par, 0x0061, 0x0001); /* NDL,VLE, REV */ |
| write_reg(par, 0x006A, 0x0000); /* set scrolling line */ |
| |
| /*-------------- 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, 0x0600); |
| write_reg(par, 0x0007, 0x0133); /* 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) { |
| /* AM: GRAM update direction */ |
| case 0: |
| write_reg(par, 0x03, 0x0030 | (par->bgr << 12)); |
| break; |
| case 180: |
| write_reg(par, 0x03, 0x0000 | (par->bgr << 12)); |
| break; |
| case 270: |
| write_reg(par, 0x03, 0x0028 | (par->bgr << 12)); |
| break; |
| case 90: |
| write_reg(par, 0x03, 0x0018 | (par->bgr << 12)); |
| 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, |
| .bpp = BPP, |
| .fps = FPS, |
| .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,ili9325", &display); |
| |
| MODULE_ALIAS("spi:" DRVNAME); |
| MODULE_ALIAS("platform:" DRVNAME); |
| MODULE_ALIAS("spi:ili9325"); |
| MODULE_ALIAS("platform:ili9325"); |
| |
| MODULE_DESCRIPTION("FB driver for the ILI9325 LCD Controller"); |
| MODULE_AUTHOR("Noralf Tronnes"); |
| MODULE_LICENSE("GPL"); |