diff options
Diffstat (limited to 'drivers/staging/fbtft/fb_st7735r.c')
| -rw-r--r-- | drivers/staging/fbtft/fb_st7735r.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/drivers/staging/fbtft/fb_st7735r.c b/drivers/staging/fbtft/fb_st7735r.c new file mode 100644 index 000000000000..b63aa38e51cf --- /dev/null +++ b/drivers/staging/fbtft/fb_st7735r.c @@ -0,0 +1,195 @@ +/* + * FB driver for the ST7735R 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 "fbtft.h" + +#define DRVNAME "fb_st7735r" +#define DEFAULT_GAMMA "0F 1A 0F 18 2F 28 20 22 1F 1B 23 37 00 07 02 10\n" \ + "0F 1B 0F 17 33 2C 29 2E 30 30 39 3F 00 07 03 10" + + +static int default_init_sequence[] = { + /* SWRESET - Software reset */ + -1, 0x01, + -2, 150, /* delay */ + + /* SLPOUT - Sleep out & booster on */ + -1, 0x11, + -2, 500, /* delay */ + + /* FRMCTR1 - frame rate control: normal mode + frame rate = fosc / (1 x 2 + 40) * (LINE + 2C + 2D) */ + -1, 0xB1, 0x01, 0x2C, 0x2D, + + /* FRMCTR2 - frame rate control: idle mode + frame rate = fosc / (1 x 2 + 40) * (LINE + 2C + 2D) */ + -1, 0xB2, 0x01, 0x2C, 0x2D, + + /* FRMCTR3 - frame rate control - partial mode + dot inversion mode, line inversion mode */ + -1, 0xB3, 0x01, 0x2C, 0x2D, 0x01, 0x2C, 0x2D, + + /* INVCTR - display inversion control + no inversion */ + -1, 0xB4, 0x07, + + /* PWCTR1 - Power Control + -4.6V, AUTO mode */ + -1, 0xC0, 0xA2, 0x02, 0x84, + + /* PWCTR2 - Power Control + VGH25 = 2.4C VGSEL = -10 VGH = 3 * AVDD */ + -1, 0xC1, 0xC5, + + /* PWCTR3 - Power Control + Opamp current small, Boost frequency */ + -1, 0xC2, 0x0A, 0x00, + + /* PWCTR4 - Power Control + BCLK/2, Opamp current small & Medium low */ + -1, 0xC3,0x8A,0x2A, + + /* PWCTR5 - Power Control */ + -1, 0xC4, 0x8A, 0xEE, + + /* VMCTR1 - Power Control */ + -1, 0xC5, 0x0E, + + /* INVOFF - Display inversion off */ + -1, 0x20, + + /* COLMOD - Interface pixel format */ + -1, 0x3A, 0x05, + + /* DISPON - Display On */ + -1, 0x29, + -2, 100, /* delay */ + + /* NORON - Partial off (Normal) */ + -1, 0x13, + -2, 10, /* delay */ + + /* end marker */ + -3 +}; + +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); + + /* Column address */ + write_reg(par, 0x2A, xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF); + + /* Row adress */ + write_reg(par, 0x2B, ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF); + + /* Memory write */ + write_reg(par, 0x2C); +} + +#define MY (1 << 7) +#define MX (1 << 6) +#define MV (1 << 5) +static int set_var(struct fbtft_par *par) +{ + fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); + + /* MADCTL - Memory data access control + RGB/BGR: + 1. Mode selection pin SRGB + RGB H/W pin for color filter setting: 0=RGB, 1=BGR + 2. MADCTL RGB bit + RGB-BGR ORDER color filter panel: 0=RGB, 1=BGR */ + switch (par->info->var.rotate) { + case 0: + write_reg(par, 0x36, MX | MY | (par->bgr << 3)); + break; + case 270: + write_reg(par, 0x36, MY | MV | (par->bgr << 3)); + break; + case 180: + write_reg(par, 0x36, (par->bgr << 3)); + break; + case 90: + write_reg(par, 0x36, MX | MV | (par->bgr << 3)); + break; + } + + return 0; +} + +/* + Gamma string format: + VRF0P VOS0P PK0P PK1P PK2P PK3P PK4P PK5P PK6P PK7P PK8P PK9P SELV0P SELV1P SELV62P SELV63P + VRF0N VOS0N PK0N PK1N PK2N PK3N PK4N PK5N PK6N PK7N PK8N PK9N SELV0N SELV1N SELV62N SELV63N +*/ +#define CURVE(num, idx) curves[num*par->gamma.num_values + idx] +static int set_gamma(struct fbtft_par *par, unsigned long *curves) +{ + int i,j; + + fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); + + /* apply mask */ + for (i = 0; i < par->gamma.num_curves; i++) + for (j = 0; j < par->gamma.num_values; j++) + CURVE(i,j) &= 0b111111; + + for (i = 0; i < par->gamma.num_curves; i++) + write_reg(par, 0xE0 + i, + CURVE(i, 0), CURVE(i, 1), CURVE(i, 2), CURVE(i, 3), + CURVE(i, 4), CURVE(i, 5), CURVE(i, 6), CURVE(i, 7), + CURVE(i, 8), CURVE(i, 9), CURVE(i, 10), CURVE(i, 11), + CURVE(i, 12), CURVE(i, 13), CURVE(i, 14), CURVE(i,15)); + + return 0; +} +#undef CURVE + + +static struct fbtft_display display = { + .regwidth = 8, + .width = 128, + .height = 160, + .init_sequence = default_init_sequence, + .gamma_num = 2, + .gamma_len = 16, + .gamma = DEFAULT_GAMMA, + .fbtftops = { + .set_addr_win = set_addr_win, + .set_var = set_var, + .set_gamma = set_gamma, + }, +}; +FBTFT_REGISTER_DRIVER(DRVNAME, "sitronix,st7735r", &display); + +MODULE_ALIAS("spi:" DRVNAME); +MODULE_ALIAS("platform:" DRVNAME); +MODULE_ALIAS("spi:st7735r"); +MODULE_ALIAS("platform:st7735r"); + +MODULE_DESCRIPTION("FB driver for the ST7735R LCD Controller"); +MODULE_AUTHOR("Noralf Tronnes"); +MODULE_LICENSE("GPL"); |