diff options
Diffstat (limited to 'drivers/staging/fbtft/fb_ili9320.c')
| -rw-r--r-- | drivers/staging/fbtft/fb_ili9320.c | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/drivers/staging/fbtft/fb_ili9320.c b/drivers/staging/fbtft/fb_ili9320.c new file mode 100644 index 000000000000..b26d89368da7 --- /dev/null +++ b/drivers/staging/fbtft/fb_ili9320.c @@ -0,0 +1,234 @@ +/* + * FB driver for the ILI9320 LCD Controller + * + * Copyright (C) 2013 Noralf Tronnes + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/gpio.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 read_devicecode(struct fbtft_par *par) +{ + int ret; + u8 rxbuf[8] = {0, }; + + write_reg(par, 0x0000); + ret = par->fbtftops.read(par, rxbuf, 4); + return (rxbuf[2] << 8) | rxbuf[3]; +} + +static int init_display(struct fbtft_par *par) +{ + unsigned devcode; + fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); + + 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 ********* */ + write_reg(par, 0x00E5, 0x8000); /* Set the Vcore voltage and this setting is must. */ + write_reg(par, 0x0000, 0x0001); /* Start internal OSC. */ + 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, 0x0202); /* set the back 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, 0x17B0); /* SAP, BT[3:0], AP, DSTB, SLP, STB */ + write_reg(par, 0x0011, 0x0031); /* R11h=0x0031 at VCI=3.3V DC1[2:0], DC0[2:0], VC[2:0] */ + mdelay(50); + write_reg(par, 0x0012, 0x0138); /* R12h=0x0138 at VCI=3.3V VREG1OUT voltage */ + mdelay(50); + write_reg(par, 0x0013, 0x1800); /* R13h=0x1800 at VCI=3.3V VDV[4:0] for VCOM amplitude */ + write_reg(par, 0x0029, 0x0008); /* R29h=0x0008 at VCI=3.3V VCM[4:0] for VCOMH */ + mdelay(50); + 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, 0x2700); /* 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, 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) +{ + fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par, + "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, 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) +{ + fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); + + 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, unsigned long *curves) +{ + unsigned long mask[] = { + 0b11111, 0b11111, 0b111, 0b111, 0b111, + 0b111, 0b111, 0b111, 0b111, 0b111, + 0b11111, 0b11111, 0b111, 0b111, 0b111, + 0b111, 0b111, 0b111, 0b111, 0b111 }; + int i, j; + + fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); + + /* 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"); 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