Staging: fbtft: Add support for the Ultrachip UC1611 LCD controller
This is a driver chip for 240x160 4-bit greyscale LCDs. It is capable of 4-wire (8 bit) or 3-wire (9 bit) SPI that have both been tested. (It also has a 6800 or 8080-style parallel interface, but I have not included support for it.) Signed-off-by: Henri Chain <henri.chain@eleves.ec-nantes.fr> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Henri Chain
Greg Kroah-Hartman
parent
dc4b206893
commit
a1560f9bec
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@ -152,6 +152,12 @@ config FB_TFT_TLS8204
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help
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Generic Framebuffer support for TLS8204
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config FB_TFT_UC1611
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tristate "FB driver for the UC1611 LCD controller"
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depends on FB_TFT
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help
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Generic Framebuffer support for UC1611
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config FB_TFT_UC1701
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tristate "FB driver for the UC1701 LCD Controller"
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depends on FB_TFT
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@ -27,6 +27,7 @@ obj-$(CONFIG_FB_TFT_SSD1351) += fb_ssd1351.o
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obj-$(CONFIG_FB_TFT_ST7735R) += fb_st7735r.o
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obj-$(CONFIG_FB_TFT_TINYLCD) += fb_tinylcd.o
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obj-$(CONFIG_FB_TFT_TLS8204) += fb_tls8204.o
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obj-$(CONFIG_FB_TFT_UC1611) += fb_uc1611.o
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obj-$(CONFIG_FB_TFT_UC1701) += fb_uc1701.o
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obj-$(CONFIG_FB_TFT_UPD161704) += fb_upd161704.o
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obj-$(CONFIG_FB_TFT_WATTEROTT) += fb_watterott.o
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@ -0,0 +1,350 @@
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/*
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* FB driver for the UltraChip UC1611 LCD controller
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*
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* The display is 4-bit grayscale (16 shades) 240x160.
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*
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* Copyright (C) 2015 Henri Chain
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/gpio.h>
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#include <linux/spi/spi.h>
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#include <linux/delay.h>
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#include "fbtft.h"
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#define DRVNAME "fb_uc1611"
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#define WIDTH 240
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#define HEIGHT 160
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#define BPP 8
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#define FPS 40
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/*
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* LCD voltage is a combination of ratio, gain, pot and temp
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*
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* V_LCD = V_BIAS * ratio
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* V_LCD = (C_V0 + C_PM × pot) * (1 + (T - 25) * temp)
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* C_V0 and C_PM depend on ratio and gain
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* T is ambient temperature
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*/
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/* BR -> actual ratio: 0-3 -> 5, 10, 11, 13 */
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static unsigned ratio = 2;
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module_param(ratio, uint, 0);
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MODULE_PARM_DESC(ratio, "BR[1:0] Bias voltage ratio: 0-3 (default: 2)");
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static unsigned gain = 3;
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module_param(gain, uint, 0);
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MODULE_PARM_DESC(gain, "GN[1:0] Bias voltage gain: 0-3 (default: 3)");
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static unsigned pot = 16;
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module_param(pot, uint, 0);
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MODULE_PARM_DESC(pot, "PM[6:0] Bias voltage pot.: 0-63 (default: 16)");
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/* TC -> % compensation per deg C: 0-3 -> -.05, -.10, -.015, -.20 */
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static unsigned temp;
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module_param(temp, uint, 0);
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MODULE_PARM_DESC(temp, "TC[1:0] Temperature compensation: 0-3 (default: 0)");
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/* PC[1:0] -> LCD capacitance: 0-3 -> <20nF, 20-28 nF, 29-40 nF, 40-56 nF */
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static unsigned load = 1;
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module_param(load, uint, 0);
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MODULE_PARM_DESC(load, "PC[1:0] Panel Loading: 0-3 (default: 1)");
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/* PC[3:2] -> V_LCD: 0, 1, 3 -> ext., int. with ratio = 5, int. standard */
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static unsigned pump = 3;
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module_param(pump, uint, 0);
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MODULE_PARM_DESC(pump, "PC[3:2] Pump control: 0,1,3 (default: 3)");
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static int init_display(struct fbtft_par *par)
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{
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int ret;
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fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
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/* Set CS active high */
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par->spi->mode |= SPI_CS_HIGH;
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ret = par->spi->master->setup(par->spi);
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if (ret) {
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dev_err(par->info->device, "Could not set SPI_CS_HIGH\n");
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return ret;
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}
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/* Reset controller */
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write_reg(par, 0xE2);
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/* Set bias ratio */
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write_reg(par, 0xE8 | (ratio & 0x03));
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/* Set bias gain and potentiometer */
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write_reg(par, 0x81);
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write_reg(par, (gain & 0x03) << 6 | (pot & 0x3F));
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/* Set temperature compensation */
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write_reg(par, 0x24 | (temp & 0x03));
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/* Set panel loading */
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write_reg(par, 0x28 | (load & 0x03));
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/* Set pump control */
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write_reg(par, 0x2C | (pump & 0x03));
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/* Set inverse display */
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write_reg(par, 0xA6 | (0x01 & 0x01));
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/* Set 4-bit grayscale mode */
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write_reg(par, 0xD0 | (0x02 & 0x03));
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/* Set Display enable */
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write_reg(par, 0xA8 | 0x07);
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return 0;
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}
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static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
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{
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fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par,
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"%s(xs=%d, ys=%d, xe=%d, ye=%d)\n",
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__func__, xs, ys, xe, ye);
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switch (par->info->var.rotate) {
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case 90:
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case 270:
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/* Set column address */
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write_reg(par, ys & 0x0F);
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write_reg(par, 0x10 | (ys >> 4));
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/* Set page address (divide xs by 2) (not used by driver) */
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write_reg(par, 0x60 | ((xs >> 1) & 0x0F));
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write_reg(par, 0x70 | (xs >> 5));
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break;
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default:
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/* Set column address (not used by driver) */
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write_reg(par, xs & 0x0F);
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write_reg(par, 0x10 | (xs >> 4));
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/* Set page address (divide ys by 2) */
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write_reg(par, 0x60 | ((ys >> 1) & 0x0F));
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write_reg(par, 0x70 | (ys >> 5));
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break;
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}
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}
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static int blank(struct fbtft_par *par, bool on)
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{
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fbtft_par_dbg(DEBUG_BLANK, par, "%s(blank=%s)\n",
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__func__, on ? "true" : "false");
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if (on)
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write_reg(par, 0xA8 | 0x00);
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else
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write_reg(par, 0xA8 | 0x07);
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return 0;
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}
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static int set_var(struct fbtft_par *par)
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{
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fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
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/* par->info->fix.visual = FB_VISUAL_PSEUDOCOLOR; */
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par->info->var.grayscale = 1;
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par->info->var.red.offset = 0;
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par->info->var.red.length = 8;
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par->info->var.green.offset = 0;
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par->info->var.green.length = 8;
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par->info->var.blue.offset = 0;
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par->info->var.blue.length = 8;
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par->info->var.transp.offset = 0;
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par->info->var.transp.length = 0;
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switch (par->info->var.rotate) {
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case 90:
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/* Set RAM address control */
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write_reg(par, 0x88
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| (0x0 & 0x1) << 2 /* Increment positively */
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| (0x1 & 0x1) << 1 /* Increment page first */
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| (0x1 & 0x1)); /* Wrap around (default) */
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/* Set LCD mapping */
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write_reg(par, 0xC0
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| (0x0 & 0x1) << 2 /* Mirror Y OFF */
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| (0x0 & 0x1) << 1 /* Mirror X OFF */
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| (0x0 & 0x1)); /* MS nibble last (default) */
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break;
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case 180:
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/* Set RAM address control */
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write_reg(par, 0x88
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| (0x0 & 0x1) << 2 /* Increment positively */
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| (0x0 & 0x1) << 1 /* Increment column first */
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| (0x1 & 0x1)); /* Wrap around (default) */
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/* Set LCD mapping */
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write_reg(par, 0xC0
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| (0x1 & 0x1) << 2 /* Mirror Y ON */
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| (0x0 & 0x1) << 1 /* Mirror X OFF */
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| (0x0 & 0x1)); /* MS nibble last (default) */
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break;
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case 270:
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/* Set RAM address control */
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write_reg(par, 0x88
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| (0x0 & 0x1) << 2 /* Increment positively */
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| (0x1 & 0x1) << 1 /* Increment page first */
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| (0x1 & 0x1)); /* Wrap around (default) */
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/* Set LCD mapping */
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write_reg(par, 0xC0
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| (0x1 & 0x1) << 2 /* Mirror Y ON */
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| (0x1 & 0x1) << 1 /* Mirror X ON */
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| (0x0 & 0x1)); /* MS nibble last (default) */
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break;
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default:
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/* Set RAM address control */
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write_reg(par, 0x88
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| (0x0 & 0x1) << 2 /* Increment positively */
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| (0x0 & 0x1) << 1 /* Increment column first */
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| (0x1 & 0x1)); /* Wrap around (default) */
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/* Set LCD mapping */
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write_reg(par, 0xC0
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| (0x0 & 0x1) << 2 /* Mirror Y OFF */
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| (0x1 & 0x1) << 1 /* Mirror X ON */
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| (0x0 & 0x1)); /* MS nibble last (default) */
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break;
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}
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return 0;
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}
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static int write_vmem(struct fbtft_par *par, size_t offset, size_t len)
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{
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u8 *vmem8 = (u8 *)(par->info->screen_base);
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u8 *buf8 = (u8 *)(par->txbuf.buf);
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u16 *buf16 = (u16 *)(par->txbuf.buf);
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int line_length = par->info->fix.line_length;
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int y_start = (offset / line_length);
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int y_end = (offset + len - 1) / line_length;
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int x, y, i;
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int ret = 0;
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fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s()\n", __func__);
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switch (par->pdata->display.buswidth) {
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case 8:
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switch (par->info->var.rotate) {
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case 90:
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case 270:
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i = y_start * line_length;
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for (y = y_start; y <= y_end; y++) {
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for (x = 0; x < line_length; x += 2) {
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*buf8 = vmem8[i] >> 4;
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*buf8 |= vmem8[i + 1] & 0xF0;
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buf8++;
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i += 2;
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}
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}
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break;
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default:
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/* Must be even because pages are two lines */
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y_start &= 0xFE;
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i = y_start * line_length;
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for (y = y_start; y <= y_end; y += 2) {
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for (x = 0; x < line_length; x++) {
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*buf8 = vmem8[i] >> 4;
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*buf8 |= vmem8[i + line_length] & 0xF0;
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buf8++;
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i++;
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}
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i += line_length;
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}
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break;
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}
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gpio_set_value(par->gpio.dc, 1);
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/* Write data */
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ret = par->fbtftops.write(par, par->txbuf.buf, len / 2);
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break;
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case 9:
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switch (par->info->var.rotate) {
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case 90:
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case 270:
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i = y_start * line_length;
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for (y = y_start; y <= y_end; y++) {
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for (x = 0; x < line_length; x += 2) {
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*buf16 = 0x100;
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*buf16 |= vmem8[i] >> 4;
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*buf16 |= vmem8[i + 1] & 0xF0;
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buf16++;
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i += 2;
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}
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}
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break;
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default:
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/* Must be even because pages are two lines */
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y_start &= 0xFE;
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i = y_start * line_length;
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for (y = y_start; y <= y_end; y += 2) {
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for (x = 0; x < line_length; x++) {
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*buf16 = 0x100;
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*buf16 |= vmem8[i] >> 4;
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*buf16 |= vmem8[i + line_length] & 0xF0;
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buf16++;
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i++;
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}
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i += line_length;
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}
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break;
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}
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/* Write data */
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ret = par->fbtftops.write(par, par->txbuf.buf, len);
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break;
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default:
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dev_err(par->info->device, "unsupported buswidth %d\n",
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par->pdata->display.buswidth);
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}
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if (ret < 0)
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dev_err(par->info->device, "write failed and returned: %d\n",
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ret);
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return ret;
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}
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static struct fbtft_display display = {
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.txbuflen = -1,
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.regwidth = 8,
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.width = WIDTH,
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.height = HEIGHT,
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.bpp = BPP,
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.fps = FPS,
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.fbtftops = {
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.write_vmem = write_vmem,
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.init_display = init_display,
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.set_addr_win = set_addr_win,
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.set_var = set_var,
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.blank = blank,
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},
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};
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FBTFT_REGISTER_DRIVER(DRVNAME, "ultrachip,uc1611", &display);
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MODULE_ALIAS("spi:" DRVNAME);
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MODULE_ALIAS("platform:" DRVNAME);
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MODULE_ALIAS("spi:uc1611");
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MODULE_ALIAS("platform:uc1611");
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MODULE_DESCRIPTION("FB driver for the UC1611 LCD controller");
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MODULE_AUTHOR("Henri Chain");
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MODULE_LICENSE("GPL");
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@ -396,6 +396,37 @@ static struct fbtft_device_display displays[] = {
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},
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}
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}
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}, {
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.name = "ew24ha0",
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.spi = &(struct spi_board_info) {
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.modalias = "fb_uc1611",
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.max_speed_hz = 32000000,
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.mode = SPI_MODE_3,
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.platform_data = &(struct fbtft_platform_data) {
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.display = {
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.buswidth = 8,
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},
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.gpios = (const struct fbtft_gpio []) {
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{ "dc", 24 },
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{},
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},
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}
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}
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}, {
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.name = "ew24ha0_9bit",
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.spi = &(struct spi_board_info) {
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.modalias = "fb_uc1611",
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.max_speed_hz = 32000000,
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.mode = SPI_MODE_3,
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.platform_data = &(struct fbtft_platform_data) {
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.display = {
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.buswidth = 9,
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},
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.gpios = (const struct fbtft_gpio []) {
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{},
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},
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}
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}
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}, {
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.name = "flexfb",
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.spi = &(struct spi_board_info) {
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