diff options
Diffstat (limited to 'drivers/staging/fbtft/fb_s6d1121.c')
| -rw-r--r-- | drivers/staging/fbtft/fb_s6d1121.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/drivers/staging/fbtft/fb_s6d1121.c b/drivers/staging/fbtft/fb_s6d1121.c new file mode 100644 index 000000000000..1ef8c1ad827e --- /dev/null +++ b/drivers/staging/fbtft/fb_s6d1121.c @@ -0,0 +1,208 @@ +/* + * FB driver for the S6D1121 LCD Controller + * + * Copyright (C) 2013 Roman Rolinsky + * + * Based on fb_ili9325.c by Noralf Tronnes + * Based on ili9325.c by Jeroen Domburg + * Init code from UTFT library by Henning Karlsen + * + * 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/delay.h> + +#include "fbtft.h" + +#define DRVNAME "fb_s6d1121" +#define WIDTH 240 +#define HEIGHT 320 +#define BPP 16 +#define FPS 20 +#define DEFAULT_GAMMA "26 09 24 2C 1F 23 24 25 22 26 25 23 0D 00\n" \ + "1C 1A 13 1D 0B 11 12 10 13 15 36 19 00 0D" + +static int init_display(struct fbtft_par *par) +{ + fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); + + par->fbtftops.reset(par); + + if (par->gpio.cs != -1) + gpio_set_value(par->gpio.cs, 0); /* Activate chip */ + + /* Initialization sequence from Lib_UTFT */ + + write_reg(par, 0x0011, 0x2004); + write_reg(par, 0x0013, 0xCC00); + write_reg(par, 0x0015, 0x2600); + write_reg(par, 0x0014, 0x252A); + write_reg(par, 0x0012, 0x0033); + write_reg(par, 0x0013, 0xCC04); + write_reg(par, 0x0013, 0xCC06); + write_reg(par, 0x0013, 0xCC4F); + write_reg(par, 0x0013, 0x674F); + write_reg(par, 0x0011, 0x2003); + write_reg(par, 0x0016, 0x0007); + write_reg(par, 0x0002, 0x0013); + write_reg(par, 0x0003, 0x0003); + write_reg(par, 0x0001, 0x0127); + write_reg(par, 0x0008, 0x0303); + write_reg(par, 0x000A, 0x000B); + write_reg(par, 0x000B, 0x0003); + write_reg(par, 0x000C, 0x0000); + write_reg(par, 0x0041, 0x0000); + write_reg(par, 0x0050, 0x0000); + write_reg(par, 0x0060, 0x0005); + write_reg(par, 0x0070, 0x000B); + write_reg(par, 0x0071, 0x0000); + write_reg(par, 0x0078, 0x0000); + write_reg(par, 0x007A, 0x0000); + write_reg(par, 0x0079, 0x0007); + write_reg(par, 0x0007, 0x0051); + write_reg(par, 0x0007, 0x0053); + write_reg(par, 0x0079, 0x0000); + + write_reg(par, 0x0022); /* Write Data to GRAM */ + + 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) { + /* AM: GRAM update direction */ + case 0: + write_reg(par, 0x03, 0x0003 | (par->bgr << 12)); + break; + case 180: + write_reg(par, 0x03, 0x0000 | (par->bgr << 12)); + break; + case 270: + write_reg(par, 0x03, 0x000A | (par->bgr << 12)); + break; + case 90: + write_reg(par, 0x03, 0x0009 | (par->bgr << 12)); + break; + } + + return 0; +} + +/* + Gamma string format: + PKP0 PKP1 PKP2 PKP3 PKP4 PKP5 PKP6 PKP7 PKP8 PKP9 PKP10 PKP11 VRP0 VRP1 + PKN0 PKN1 PKN2 PKN3 PKN4 PKN5 PKN6 PKN7 PRN8 PRN9 PRN10 PRN11 VRN0 VRN1 +*/ +#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[] = { + 0b111111, 0b111111, 0b111111, 0b111111, 0b111111, 0b111111, + 0b111111, 0b111111, 0b111111, 0b111111, 0b111111, 0b111111, + 0b11111, 0b11111, + 0b111111, 0b111111, 0b111111, 0b111111, 0b111111, 0b111111, + 0b111111, 0b111111, 0b111111, 0b111111, 0b111111, 0b111111, + 0b11111, 0b11111 }; + 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 < 14; j++) + CURVE(i, j) &= mask[i*par->gamma.num_values + j]; + + write_reg(par, 0x0030, CURVE(0, 1) << 8 | CURVE(0, 0)); + write_reg(par, 0x0031, CURVE(0, 3) << 8 | CURVE(0, 2)); + write_reg(par, 0x0032, CURVE(0, 5) << 8 | CURVE(0, 3)); + write_reg(par, 0x0033, CURVE(0, 7) << 8 | CURVE(0, 6)); + write_reg(par, 0x0034, CURVE(0, 9) << 8 | CURVE(0, 8)); + write_reg(par, 0x0035, CURVE(0, 11) << 8 | CURVE(0, 10)); + + write_reg(par, 0x0036, CURVE(1, 1) << 8 | CURVE(1, 0)); + write_reg(par, 0x0037, CURVE(1, 3) << 8 | CURVE(1, 2)); + write_reg(par, 0x0038, CURVE(1, 5) << 8 | CURVE(1, 4)); + write_reg(par, 0x0039, CURVE(1, 7) << 8 | CURVE(1, 6)); + write_reg(par, 0x003A, CURVE(1, 9) << 8 | CURVE(1, 8)); + write_reg(par, 0x003B, CURVE(1, 11) << 8 | CURVE(1, 10)); + + write_reg(par, 0x003C, CURVE(0, 13) << 8 | CURVE(0, 12)); + write_reg(par, 0x003D, CURVE(1, 13) << 8 | CURVE(1, 12)); + + return 0; +} +#undef CURVE + + +static struct fbtft_display display = { + .regwidth = 16, + .width = WIDTH, + .height = HEIGHT, + .bpp = BPP, + .fps = FPS, + .gamma_num = 2, + .gamma_len = 14, + .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, "samsung,s6d1121", &display); + +MODULE_ALIAS("spi:" DRVNAME); +MODULE_ALIAS("platform:" DRVNAME); +MODULE_ALIAS("spi:s6d1121"); +MODULE_ALIAS("platform:s6d1121"); + +MODULE_DESCRIPTION("FB driver for the S6D1121 LCD Controller"); +MODULE_AUTHOR("Roman Rolinsky"); +MODULE_LICENSE("GPL"); |