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// SPDX-License-Identifier: GPL-2.0
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/gpio/consumer.h>
#include <linux/spi/spi.h>
#include <linux/delay.h>
#include "fbtft.h"
#define DRVNAME "fb_ssd1331"
#define WIDTH 96
#define HEIGHT 64
#define GAMMA_NUM 1
#define GAMMA_LEN 63
#define DEFAULT_GAMMA "0 2 2 2 2 2 2 2 " \
"2 2 2 2 2 2 2 2 " \
"2 2 2 2 2 2 2 2 " \
"2 2 2 2 2 2 2 2 " \
"2 2 2 2 2 2 2 2 " \
"2 2 2 2 2 2 2 2 " \
"2 2 2 2 2 2 2 2 " \
"2 2 2 2 2 2 2" \
static int init_display(struct fbtft_par *par)
{
par->fbtftops.reset(par);
write_reg(par, 0xae); /* Display Off */
/* Set Column Address Mapping, COM Scan Direction and Colour Depth */
if (par->info->var.rotate == 180)
write_reg(par, 0xa0, 0x60 | (par->bgr << 2));
else
write_reg(par, 0xa0, 0x72 | (par->bgr << 2));
write_reg(par, 0x72); /* RGB colour */
write_reg(par, 0xa1, 0x00); /* Set Display Start Line */
write_reg(par, 0xa2, 0x00); /* Set Display Offset */
write_reg(par, 0xa4); /* NORMALDISPLAY */
write_reg(par, 0xa8, 0x3f); /* Set multiplex */
write_reg(par, 0xad, 0x8e); /* Set master */
/* write_reg(par, 0xb0, 0x0b); Set power mode */
write_reg(par, 0xb1, 0x31); /* Precharge */
write_reg(par, 0xb3, 0xf0); /* Clock div */
write_reg(par, 0x8a, 0x64); /* Precharge A */
write_reg(par, 0x8b, 0x78); /* Precharge B */
write_reg(par, 0x8c, 0x64); /* Precharge C */
write_reg(par, 0xbb, 0x3a); /* Precharge level */
write_reg(par, 0xbe, 0x3e); /* vcomh */
write_reg(par, 0x87, 0x06); /* Master current */
write_reg(par, 0x81, 0x91); /* Contrast A */
write_reg(par, 0x82, 0x50); /* Contrast B */
write_reg(par, 0x83, 0x7d); /* Contrast C */
write_reg(par, 0xaf); /* Set Sleep Mode Display On */
return 0;
}
static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
{
write_reg(par, 0x15, xs, xe);
write_reg(par, 0x75, ys, ye);
}
static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
{
va_list args;
int i, ret;
u8 *buf = par->buf;
if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) {
va_start(args, len);
for (i = 0; i < len; i++)
buf[i] = (u8)va_arg(args, unsigned int);
va_end(args);
fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, par->info->device, u8, buf, len, "%s: ", __func__);
}
va_start(args, len);
*buf = (u8)va_arg(args, unsigned int);
if (!par->gpio.dc)
gpiod_set_value(par->gpio.dc, 0);
ret = par->fbtftops.write(par, par->buf, sizeof(u8));
if (ret < 0) {
va_end(args);
dev_err(par->info->device,
"write() failed and returned %d\n", ret);
return;
}
len--;
if (len) {
i = len;
while (i--)
*buf++ = (u8)va_arg(args, unsigned int);
ret = par->fbtftops.write(par, par->buf, len * (sizeof(u8)));
if (ret < 0) {
va_end(args);
dev_err(par->info->device,
"write() failed and returned %d\n", ret);
return;
}
}
if (!par->gpio.dc)
gpiod_set_value(par->gpio.dc, 1);
va_end(args);
}
/*
* Grayscale Lookup Table
* GS1 - GS63
* The driver Gamma curve contains the relative values between the entries
* in the Lookup table.
*
* From datasheet:
* 8.8 Gray Scale Decoder
*
* there are total 180 Gamma Settings (Setting 0 to Setting 180)
* available for the Gray Scale table.
*
* The gray scale is defined in incremental way, with reference
* to the length of previous table entry:
* Setting of GS1 has to be >= 0
* Setting of GS2 has to be > Setting of GS1 +1
* Setting of GS3 has to be > Setting of GS2 +1
* :
* Setting of GS63 has to be > Setting of GS62 +1
*
*/
static int set_gamma(struct fbtft_par *par, u32 *curves)
{
unsigned long tmp[GAMMA_NUM * GAMMA_LEN];
int i, acc = 0;
for (i = 0; i < 63; i++) {
if (i > 0 && curves[i] < 2) {
dev_err(par->info->device,
"Illegal value in Grayscale Lookup Table at index %d. Must be greater than 1\n",
i);
return -EINVAL;
}
acc += curves[i];
tmp[i] = acc;
if (acc > 180) {
dev_err(par->info->device,
"Illegal value(s) in Grayscale Lookup Table. At index=%d, the accumulated value has exceeded 180\n",
i);
return -EINVAL;
}
}
write_reg(par, 0xB8,
tmp[0], tmp[1], tmp[2], tmp[3], tmp[4], tmp[5], tmp[6],
tmp[7], tmp[8], tmp[9], tmp[10], tmp[11], tmp[12], tmp[13],
tmp[14], tmp[15], tmp[16], tmp[17], tmp[18], tmp[19], tmp[20],
tmp[21], tmp[22], tmp[23], tmp[24], tmp[25], tmp[26], tmp[27],
tmp[28], tmp[29], tmp[30], tmp[31], tmp[32], tmp[33], tmp[34],
tmp[35], tmp[36], tmp[37], tmp[38], tmp[39], tmp[40], tmp[41],
tmp[42], tmp[43], tmp[44], tmp[45], tmp[46], tmp[47], tmp[48],
tmp[49], tmp[50], tmp[51], tmp[52], tmp[53], tmp[54], tmp[55],
tmp[56], tmp[57], tmp[58], tmp[59], tmp[60], tmp[61],
tmp[62]);
return 0;
}
static int blank(struct fbtft_par *par, bool on)
{
fbtft_par_dbg(DEBUG_BLANK, par, "(%s=%s)\n",
__func__, on ? "true" : "false");
if (on)
write_reg(par, 0xAE);
else
write_reg(par, 0xAF);
return 0;
}
static struct fbtft_display display = {
.regwidth = 8,
.width = WIDTH,
.height = HEIGHT,
.gamma_num = GAMMA_NUM,
.gamma_len = GAMMA_LEN,
.gamma = DEFAULT_GAMMA,
.fbtftops = {
.write_register = write_reg8_bus8,
.init_display = init_display,
.set_addr_win = set_addr_win,
.set_gamma = set_gamma,
.blank = blank,
},
};
FBTFT_REGISTER_DRIVER(DRVNAME, "solomon,ssd1331", &display);
MODULE_ALIAS("spi:" DRVNAME);
MODULE_ALIAS("platform:" DRVNAME);
MODULE_ALIAS("spi:ssd1331");
MODULE_ALIAS("platform:ssd1331");
MODULE_DESCRIPTION("SSD1331 OLED Driver");
MODULE_AUTHOR("Alec Smecher (adapted from SSD1351 by James Davies)");
MODULE_LICENSE("GPL");
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