fb_hx8357d.c

  1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * FB driver for the HX8357D LCD Controller
  4 * Copyright (C) 2015 Adafruit Industries
  5 *
  6 * Based on the HX8347D FB driver
  7 * Copyright (C) 2013 Christian Vogelgsang
  8 *
  9 * Based on driver code found here: https://github.com/watterott/r61505u-Adapter
 10 */
 11
 12#include <linux/module.h>
 13#include <linux/kernel.h>
 14#include <linux/init.h>
 15#include <linux/delay.h>
 16#include <video/mipi_display.h>
 17
 18#include "fbtft.h"
 19#include "fb_hx8357d.h"
 20
 21#define DRVNAME		"fb_hx8357d"
 22#define WIDTH		320
 23#define HEIGHT		480
 24
 25static int init_display(struct fbtft_par *par)
 26{
 27	par->fbtftops.reset(par);
 28
 29	/* Reset things like Gamma */
 30	write_reg(par, MIPI_DCS_SOFT_RESET);
 31	usleep_range(5000, 7000);
 32
 33	/* setextc */
 34	write_reg(par, HX8357D_SETC, 0xFF, 0x83, 0x57);
 35	msleep(150);
 36
 37	/* setRGB which also enables SDO */
 38	write_reg(par, HX8357_SETRGB, 0x00, 0x00, 0x06, 0x06);
 39
 40	/* -1.52V */
 41	write_reg(par, HX8357D_SETCOM, 0x25);
 42
 43	/* Normal mode 70Hz, Idle mode 55 Hz */
 44	write_reg(par, HX8357_SETOSC, 0x68);
 45
 46	/* Set Panel - BGR, Gate direction swapped */
 47	write_reg(par, HX8357_SETPANEL, 0x05);
 48
 49	write_reg(par, HX8357_SETPWR1,
 50		  0x00,  /* Not deep standby */
 51		  0x15,  /* BT */
 52		  0x1C,  /* VSPR */
 53		  0x1C,  /* VSNR */
 54		  0x83,  /* AP */
 55		  0xAA);  /* FS */
 56
 57	write_reg(par, HX8357D_SETSTBA,
 58		  0x50,  /* OPON normal */
 59		  0x50,  /* OPON idle */
 60		  0x01,  /* STBA */
 61		  0x3C,  /* STBA */
 62		  0x1E,  /* STBA */
 63		  0x08);  /* GEN */
 64
 65	write_reg(par, HX8357D_SETCYC,
 66		  0x02,  /* NW 0x02 */
 67		  0x40,  /* RTN */
 68		  0x00,  /* DIV */
 69		  0x2A,  /* DUM */
 70		  0x2A,  /* DUM */
 71		  0x0D,  /* GDON */
 72		  0x78);  /* GDOFF */
 73
 74	write_reg(par, HX8357D_SETGAMMA,
 75		  0x02,
 76		  0x0A,
 77		  0x11,
 78		  0x1d,
 79		  0x23,
 80		  0x35,
 81		  0x41,
 82		  0x4b,
 83		  0x4b,
 84		  0x42,
 85		  0x3A,
 86		  0x27,
 87		  0x1B,
 88		  0x08,
 89		  0x09,
 90		  0x03,
 91		  0x02,
 92		  0x0A,
 93		  0x11,
 94		  0x1d,
 95		  0x23,
 96		  0x35,
 97		  0x41,
 98		  0x4b,
 99		  0x4b,
100		  0x42,
101		  0x3A,
102		  0x27,
103		  0x1B,
104		  0x08,
105		  0x09,
106		  0x03,
107		  0x00,
108		  0x01);
109
110	/* 16 bit */
111	write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
112
113	write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0xC0);
114
115	/* TE off */
116	write_reg(par, MIPI_DCS_SET_TEAR_ON, 0x00);
117
118	/* tear line */
119	write_reg(par, MIPI_DCS_SET_TEAR_SCANLINE, 0x00, 0x02);
120
121	/* Exit Sleep */
122	write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
123	msleep(150);
124
125	/* display on */
126	write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
127	usleep_range(5000, 7000);
128
129	return 0;
130}
131
132static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
133{
134	write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
135		  xs >> 8, xs & 0xff,  /* XSTART */
136		  xe >> 8, xe & 0xff); /* XEND */
137
138	write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
139		  ys >> 8, ys & 0xff,  /* YSTART */
140		  ye >> 8, ye & 0xff); /* YEND */
141
142	write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
143}
144
145#define HX8357D_MADCTL_MY  0x80
146#define HX8357D_MADCTL_MX  0x40
147#define HX8357D_MADCTL_MV  0x20
148#define HX8357D_MADCTL_ML  0x10
149#define HX8357D_MADCTL_RGB 0x00
150#define HX8357D_MADCTL_BGR 0x08
151#define HX8357D_MADCTL_MH  0x04
152static int set_var(struct fbtft_par *par)
153{
154	u8 val;
155
156	switch (par->info->var.rotate) {
157	case 270:
158		val = HX8357D_MADCTL_MV | HX8357D_MADCTL_MX;
159		break;
160	case 180:
161		val = 0;
162		break;
163	case 90:
164		val = HX8357D_MADCTL_MV | HX8357D_MADCTL_MY;
165		break;
166	default:
167		val = HX8357D_MADCTL_MX | HX8357D_MADCTL_MY;
168		break;
169	}
170
171	val |= (par->bgr ? HX8357D_MADCTL_RGB : HX8357D_MADCTL_BGR);
172
173	/* Memory Access Control */
174	write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, val);
175
176	return 0;
177}
178
179static struct fbtft_display display = {
180	.regwidth = 8,
181	.width = WIDTH,
182	.height = HEIGHT,
183	.gamma_num = 2,
184	.gamma_len = 14,
185	.fbtftops = {
186		.init_display = init_display,
187		.set_addr_win = set_addr_win,
188		.set_var = set_var,
189	},
190};
191
192FBTFT_REGISTER_DRIVER(DRVNAME, "himax,hx8357d", &display);
193
194MODULE_ALIAS("spi:" DRVNAME);
195MODULE_ALIAS("platform:" DRVNAME);
196MODULE_ALIAS("spi:hx8357d");
197MODULE_ALIAS("platform:hx8357d");
198
199MODULE_DESCRIPTION("FB driver for the HX8357D LCD Controller");
200MODULE_AUTHOR("Sean Cross <xobs@kosagi.com>");
201MODULE_LICENSE("GPL");