--- /dev/null
+/*
+ * FB driver for Two KS0108 LCD controllers in AGM1264K-FL display
+ *
+ * Copyright (C) 2014 ololoshka2871
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+
+#include "fbtft.h"
+
+/* Uncomment text line to use negative image on display */
+/*#define NEGATIVE*/
+
+#define WHITE 0xff
+#define BLACK 0
+
+#define DRVNAME "fb_agm1264k-fl"
+#define WIDTH 64
+#define HEIGHT 64
+#define TOTALWIDTH (WIDTH * 2) /* because 2 x ks0108 in one display */
+#define FPS 20
+
+#define EPIN gpio.wr
+#define RS gpio.dc
+#define RW gpio.aux[2]
+#define CS0 gpio.aux[0]
+#define CS1 gpio.aux[1]
+
+
+/* diffusing error (\93Floyd-Steinberg\94) */
+#define DIFFUSING_MATRIX_WIDTH 2
+#define DIFFUSING_MATRIX_HEIGHT 2
+
+static const signed char
+diffusing_matrix[DIFFUSING_MATRIX_WIDTH][DIFFUSING_MATRIX_HEIGHT] = {
+ {-1, 3},
+ {3, 2},
+};
+
+static const unsigned char gamma_correction_table[] = {
+0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1,
+1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6,
+6, 6, 6, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 11, 11, 11, 12, 12, 13,
+13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21,
+22, 22, 23, 23, 24, 25, 25, 26, 26, 27, 28, 28, 29, 30, 30, 31, 32,
+33, 33, 34, 35, 35, 36, 37, 38, 39, 39, 40, 41, 42, 43, 43, 44, 45,
+46, 47, 48, 49, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,
+62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78, 79, 81,
+82, 83, 84, 85, 87, 88, 89, 90, 91, 93, 94, 95, 97, 98, 99, 100, 102,
+103, 105, 106, 107, 109, 110, 111, 113, 114, 116, 117, 119, 120, 121,
+123, 124, 126, 127, 129, 130, 132, 133, 135, 137, 138, 140, 141, 143,
+145, 146, 148, 149, 151, 153, 154, 156, 158, 159, 161, 163, 165, 166,
+168, 170, 172, 173, 175, 177, 179, 181, 182, 184, 186, 188, 190, 192,
+194, 196, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 217, 219,
+221, 223, 225, 227, 229, 231, 234, 236, 238, 240, 242, 244, 246, 248,
+251, 253, 255
+};
+
+static int init_display(struct fbtft_par *par)
+{
+ u8 i;
+
+ fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+ par->fbtftops.reset(par);
+
+ for (i = 0; i < 2; ++i) {
+ write_reg(par, i, 0x3f); /* display on */
+ write_reg(par, i, 0x40); /* set x to 0 */
+ write_reg(par, i, 0xb0); /* set page to 0 */
+ write_reg(par, i, 0xc0); /* set start line to 0 */
+ }
+
+ return 0;
+}
+
+void reset(struct fbtft_par *par)
+{
+ if (par->gpio.reset == -1)
+ return;
+
+ fbtft_dev_dbg(DEBUG_RESET, par, par->info->device, "%s()\n", __func__);
+
+ gpio_set_value(par->gpio.reset, 0);
+ udelay(20);
+ gpio_set_value(par->gpio.reset, 1);
+ mdelay(120);
+}
+
+/* Check if all necessary GPIOS defined */
+static int verify_gpios(struct fbtft_par *par)
+{
+ int i;
+
+ fbtft_dev_dbg(DEBUG_VERIFY_GPIOS, par, par->info->device,
+ "%s()\n", __func__);
+
+ if (par->EPIN < 0) {
+ dev_err(par->info->device,
+ "Missing info about 'wr' (aka E) gpio. Aborting.\n");
+ return -EINVAL;
+ }
+ for (i = 0; i < 8; ++i) {
+ if (par->gpio.db[i] < 0) {
+ dev_err(par->info->device,
+ "Missing info about 'db[%i]' gpio. Aborting.\n",
+ i);
+ return -EINVAL;
+ }
+ }
+ if (par->CS0 < 0) {
+ dev_err(par->info->device,
+ "Missing info about 'cs0' gpio. Aborting.\n");
+ return -EINVAL;
+ }
+ if (par->CS1 < 0) {
+ dev_err(par->info->device,
+ "Missing info about 'cs1' gpio. Aborting.\n");
+ return -EINVAL;
+ }
+ if (par->RW < 0) {
+ dev_err(par->info->device,
+ "Missing info about 'rw' gpio. Aborting.\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static unsigned long
+request_gpios_match(struct fbtft_par *par, const struct fbtft_gpio *gpio)
+{
+ fbtft_dev_dbg(DEBUG_REQUEST_GPIOS_MATCH, par, par->info->device,
+ "%s('%s')\n", __func__, gpio->name);
+
+ if (strcasecmp(gpio->name, "wr") == 0) {
+ /* left ks0108 E pin */
+ par->EPIN = gpio->gpio;
+ return GPIOF_OUT_INIT_LOW;
+ } else if (strcasecmp(gpio->name, "cs0") == 0) {
+ /* left ks0108 controller pin */
+ par->CS0 = gpio->gpio;
+ return GPIOF_OUT_INIT_HIGH;
+ } else if (strcasecmp(gpio->name, "cs1") == 0) {
+ /* right ks0108 controller pin */
+ par->CS1 = gpio->gpio;
+ return GPIOF_OUT_INIT_HIGH;
+ }
+
+ /* if write (rw = 0) e(1->0) perform write */
+ /* if read (rw = 1) e(0->1) set data on D0-7*/
+ else if (strcasecmp(gpio->name, "rw") == 0) {
+ par->RW = gpio->gpio;
+ return GPIOF_OUT_INIT_LOW;
+ }
+
+ return FBTFT_GPIO_NO_MATCH;
+}
+
+/* This function oses to enter commands
+ * first byte - destination controller 0 or 1
+ * folowing - commands
+ */
+static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
+{
+ va_list args;
+ int i, ret;
+ u8 *buf = (u8 *)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 (*buf > 1) {
+ va_end(args);
+ dev_err(par->info->device, "%s: Incorrect chip sellect request (%d)\n",
+ __func__, *buf);
+ return;
+ }
+
+ /* select chip */
+ if (*buf) {
+ /* cs1 */
+ gpio_set_value(par->CS0, 1);
+ gpio_set_value(par->CS1, 0);
+ } else {
+ /* cs0 */
+ gpio_set_value(par->CS0, 0);
+ gpio_set_value(par->CS1, 1);
+ }
+
+ gpio_set_value(par->RS, 0); /* RS->0 (command mode) */
+ 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, "%s: write() failed and returned %d\n",
+ __func__, ret);
+ return;
+ }
+ }
+
+ va_end(args);
+}
+
+static struct
+{
+ int xs, ys_page, xe, ye_page;
+} addr_win;
+
+/* save display writing zone */
+static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
+{
+ addr_win.xs = xs;
+ addr_win.ys_page = ys / 8;
+ addr_win.xe = xe;
+ addr_win.ye_page = ye / 8;
+
+ fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par,
+ "%s(xs=%d, ys_page=%d, xe=%d, ye_page=%d)\n", __func__,
+ addr_win.xs, addr_win.ys_page, addr_win.xe, addr_win.ye_page);
+}
+
+static void
+construct_line_bitmap(struct fbtft_par *par, u8 *dest, signed short *src,
+ int xs, int xe, int y)
+{
+ int x, i;
+
+ for (x = xs; x < xe; ++x) {
+ u8 res = 0;
+
+ for (i = 0; i < 8; i++)
+ if (src[(y * 8 + i) * par->info->var.xres + x])
+ res |= 1 << i;
+#ifdef NEGATIVE
+ *dest++ = res;
+#else
+ *dest++ = ~res;
+#endif
+ }
+}
+
+static int write_vmem(struct fbtft_par *par, size_t offset, size_t len)
+{
+ u16 *vmem16 = (u16 *)par->info->screen_base;
+ u8 *buf = par->txbuf.buf;
+ int x, y;
+ int ret = 0;
+
+ /* buffer to convert RGB565 -> grayscale16 -> Ditherd image 1bpp */
+ signed short *convert_buf = kmalloc(par->info->var.xres *
+ par->info->var.yres * sizeof(signed short), GFP_NOIO);
+
+ fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s()\n", __func__);
+
+ /* converting to grayscale16 */
+ for (x = 0; x < par->info->var.xres; ++x)
+ for (y = 0; y < par->info->var.yres; ++y) {
+ u16 pixel = vmem16[y * par->info->var.xres + x];
+ u16 b = pixel & 0x1f;
+ u16 g = (pixel & (0x3f << 5)) >> 5;
+ u16 r = (pixel & (0x1f << (5 + 6))) >> (5 + 6);
+
+ pixel = (299 * r + 587 * g + 114 * b) / 200;
+ if (pixel > 255)
+ pixel = 255;
+
+ /* gamma-correction by table */
+ convert_buf[y * par->info->var.xres + x] =
+ (signed short)gamma_correction_table[pixel];
+ }
+
+ /* Image Dithering */
+ for (x = 0; x < par->info->var.xres; ++x)
+ for (y = 0; y < par->info->var.yres; ++y) {
+ signed short pixel =
+ convert_buf[y * par->info->var.xres + x];
+ signed short error_b = pixel - BLACK;
+ signed short error_w = pixel - WHITE;
+ signed short error;
+ u16 i, j;
+
+ /* what color close? */
+ if (abs(error_b) >= abs(error_w)) {
+ /* white */
+ error = error_w;
+ pixel = 0xff;
+ } else {
+ /* black */
+ error = error_b;
+ pixel = 0;
+ }
+
+ error /= 8;
+
+ /* diffusion matrix row */
+ for (i = 0; i < DIFFUSING_MATRIX_WIDTH; ++i)
+ /* diffusion matrix column */
+ for (j = 0; j < DIFFUSING_MATRIX_HEIGHT; ++j) {
+ signed short *write_pos;
+ signed char coeff;
+
+ /* skip pixels out of zone */
+ if (x + i < 0 ||
+ x + i >= par->info->var.xres
+ || y + j >= par->info->var.yres)
+ continue;
+ write_pos = &convert_buf[
+ (y + j) * par->info->var.xres +
+ x + i];
+ coeff = diffusing_matrix[i][j];
+ if (coeff == -1)
+ /* pixel itself */
+ *write_pos = pixel;
+ else {
+ signed short p = *write_pos +
+ error * coeff;
+
+ if (p > WHITE)
+ p = WHITE;
+ if (p < BLACK)
+ p = BLACK;
+ *write_pos = p;
+ }
+ }
+ }
+
+ /* 1 string = 2 pages */
+ for (y = addr_win.ys_page; y <= addr_win.ye_page; ++y) {
+ /* left half of display */
+ if (addr_win.xs < par->info->var.xres / 2) {
+ construct_line_bitmap(par, buf, convert_buf,
+ addr_win.xs, par->info->var.xres / 2, y);
+
+ len = par->info->var.xres / 2 - addr_win.xs;
+
+ /* select left side (sc0)
+ * set addr
+ */
+ write_reg(par, 0x00, (1 << 6) | (u8)addr_win.xs);
+ write_reg(par, 0x00, (0x17 << 3) | (u8)y);
+
+ /* write bitmap */
+ gpio_set_value(par->RS, 1); /* RS->1 (data mode) */
+ ret = par->fbtftops.write(par, buf, len);
+ if (ret < 0)
+ dev_err(par->info->device,
+ "%s: write failed and returned: %d\n",
+ __func__, ret);
+ }
+ /* right half of display */
+ if (addr_win.xe >= par->info->var.xres / 2) {
+ construct_line_bitmap(par, buf,
+ convert_buf, par->info->var.xres / 2,
+ addr_win.xe + 1, y);
+
+ len = addr_win.xe + 1 - par->info->var.xres / 2;
+
+ /* select right side (sc1)
+ * set addr
+ */
+ write_reg(par, 0x01, (1 << 6));
+ write_reg(par, 0x01, (0x17 << 3) | (u8)y);
+
+ /* write bitmap */
+ gpio_set_value(par->RS, 1); /* RS->1 (data mode) */
+ par->fbtftops.write(par, buf, len);
+ if (ret < 0)
+ dev_err(par->info->device,
+ "%s: write failed and returned: %d\n",
+ __func__, ret);
+ }
+ }
+ kfree(convert_buf);
+
+ gpio_set_value(par->CS0, 1);
+ gpio_set_value(par->CS1, 1);
+
+ return ret;
+}
+
+static int write(struct fbtft_par *par, void *buf, size_t len)
+{
+ fbtft_par_dbg_hex(DEBUG_WRITE, par, par->info->device, u8, buf, len,
+ "%s(len=%d): ", __func__, len);
+
+ gpio_set_value(par->RW, 0); /* set write mode */
+
+
+ while (len--) {
+ u8 i, data;
+
+ data = *(u8 *) buf++;
+
+ /* set data bus */
+ for (i = 0; i < 8; ++i)
+ gpio_set_value(par->gpio.db[i], data & (1 << i));
+ /* set E */
+ gpio_set_value(par->EPIN, 1);
+ udelay(5);
+ /* unset E - write */
+ gpio_set_value(par->EPIN, 0);
+ udelay(1);
+ }
+
+ return 0;
+}
+
+static struct fbtft_display display = {
+ .regwidth = 8,
+ .width = TOTALWIDTH,
+ .height = HEIGHT,
+ .fps = FPS,
+ .fbtftops = {
+ .init_display = init_display,
+ .set_addr_win = set_addr_win,
+ .verify_gpios = verify_gpios,
+ .request_gpios_match = request_gpios_match,
+ .reset = reset,
+ .write = write,
+ .write_register = write_reg8_bus8,
+ .write_vmem = write_vmem,
+ },
+};
+FBTFT_REGISTER_DRIVER(DRVNAME, "displaytronic,fb_agm1264k-fl", &display);
+
+MODULE_ALIAS("platform:" DRVNAME);
+
+MODULE_DESCRIPTION("Two KS0108 LCD controllers in AGM1264K-FL display");
+MODULE_AUTHOR("ololoshka2871");
+MODULE_LICENSE("GPL");
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff