staging: fbtft: add fb_ssd1289 driver

This commit adds the fb_ssd1289 driver from the fbtft project at
https://github.com/notro/fbtft.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Noralf Tronnes <notro@tronnes.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/fbtft/Kconfig b/drivers/staging/fbtft/Kconfig
index 4fd9cfd..05e8571 100644 (file)
--- a/drivers/staging/fbtft/Kconfig
+++ b/drivers/staging/fbtft/Kconfig
@@ -97,3 +97,9 @@ config FB_TFT_S6D1121
        depends on FB_TFT
        help
          Generic Framebuffer support for S6D1121
+
+config FB_TFT_SSD1289
+       tristate "FB driver for the SSD1289 LCD Controller"
+       depends on FB_TFT
+       help
+         Framebuffer support for SSD1289

diff --git a/drivers/staging/fbtft/Makefile b/drivers/staging/fbtft/Makefile
index 48b3ce1..ea5fa1e 100644 (file)
--- a/drivers/staging/fbtft/Makefile
+++ b/drivers/staging/fbtft/Makefile
@@ -18,3 +18,4 @@ obj-$(CONFIG_FB_TFT_PCD8544)     += fb_pcd8544.o
 obj-$(CONFIG_FB_TFT_RA8875)      += fb_ra8875.o
 obj-$(CONFIG_FB_TFT_S6D02A1)     += fb_s6d02a1.o
 obj-$(CONFIG_FB_TFT_S6D1121)     += fb_s6d1121.o
+obj-$(CONFIG_FB_TFT_SSD1289)     += fb_ssd1289.o

diff --git a/drivers/staging/fbtft/fb_ssd1289.c b/drivers/staging/fbtft/fb_ssd1289.c
new file mode 100644 (file)
index 0000000..ef46fbc
--- /dev/null
+++ b/drivers/staging/fbtft/fb_ssd1289.c
@@ -0,0 +1,206 @@
+/*
+ * FB driver for the SSD1289 LCD Controller
+ *
+ * Copyright (C) 2013 Noralf Tronnes
+ *
+ * Init sequence taken from ITDB02_Graph16.cpp - (C)2010-2011 Henning Karlsen
+ *
+ * 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 <linux/gpio.h>
+
+#include "fbtft.h"
+
+#define DRVNAME                "fb_ssd1289"
+#define WIDTH          240
+#define HEIGHT         320
+#define DEFAULT_GAMMA  "02 03 2 5 7 7 4 2 4 2\n" \
+                       "02 03 2 5 7 5 4 2 4 2"
+
+static unsigned reg11 = 0x6040;
+module_param(reg11, uint, 0);
+MODULE_PARM_DESC(reg11, "Register 11h value");
+
+
+static int init_display(struct fbtft_par *par)
+{
+       fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+       par->fbtftops.reset(par);
+
+       if (par->gpio.cs != -1)
+               gpio_set_value(par->gpio.cs, 0);  /* Activate chip */
+
+       write_reg(par, 0x00, 0x0001);
+       write_reg(par, 0x03, 0xA8A4);
+       write_reg(par, 0x0C, 0x0000);
+       write_reg(par, 0x0D, 0x080C);
+       write_reg(par, 0x0E, 0x2B00);
+       write_reg(par, 0x1E, 0x00B7);
+       write_reg(par, 0x01,
+               (1 << 13) | (par->bgr << 11) | (1 << 9) | (HEIGHT - 1));
+       write_reg(par, 0x02, 0x0600);
+       write_reg(par, 0x10, 0x0000);
+       write_reg(par, 0x05, 0x0000);
+       write_reg(par, 0x06, 0x0000);
+       write_reg(par, 0x16, 0xEF1C);
+       write_reg(par, 0x17, 0x0003);
+       write_reg(par, 0x07, 0x0233);
+       write_reg(par, 0x0B, 0x0000);
+       write_reg(par, 0x0F, 0x0000);
+       write_reg(par, 0x41, 0x0000);
+       write_reg(par, 0x42, 0x0000);
+       write_reg(par, 0x48, 0x0000);
+       write_reg(par, 0x49, 0x013F);
+       write_reg(par, 0x4A, 0x0000);
+       write_reg(par, 0x4B, 0x0000);
+       write_reg(par, 0x44, 0xEF00);
+       write_reg(par, 0x45, 0x0000);
+       write_reg(par, 0x46, 0x013F);
+       write_reg(par, 0x23, 0x0000);
+       write_reg(par, 0x24, 0x0000);
+       write_reg(par, 0x25, 0x8000);
+       write_reg(par, 0x4f, 0x0000);
+       write_reg(par, 0x4e, 0x0000);
+       write_reg(par, 0x22);
+       return 0;
+}
+
+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);
+
+       switch (par->info->var.rotate) {
+       /* R4Eh - Set GDDRAM X address counter */
+       /* R4Fh - Set GDDRAM Y address counter */
+       case 0:
+               write_reg(par, 0x4e, xs);
+               write_reg(par, 0x4f, ys);
+               break;
+       case 180:
+               write_reg(par, 0x4e, par->info->var.xres - 1 - xs);
+               write_reg(par, 0x4f, par->info->var.yres - 1 - ys);
+               break;
+       case 270:
+               write_reg(par, 0x4e, par->info->var.yres - 1 - ys);
+               write_reg(par, 0x4f, xs);
+               break;
+       case 90:
+               write_reg(par, 0x4e, ys);
+               write_reg(par, 0x4f, par->info->var.xres - 1 - xs);
+               break;
+       }
+
+       /* R22h - RAM data write */
+       write_reg(par, 0x22);
+}
+
+static int set_var(struct fbtft_par *par)
+{
+       fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+       if (par->fbtftops.init_display != init_display) {
+               /* don't risk messing up register 11h */
+               fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
+                       "%s: skipping since custom init_display() is used\n",
+                       __func__);
+               return 0;
+       }
+
+       switch (par->info->var.rotate) {
+       case 0:
+               write_reg(par, 0x11, reg11 | 0b110000);
+               break;
+       case 270:
+               write_reg(par, 0x11, reg11 | 0b101000);
+               break;
+       case 180:
+               write_reg(par, 0x11, reg11 | 0b000000);
+               break;
+       case 90:
+               write_reg(par, 0x11, reg11 | 0b011000);
+               break;
+       }
+
+       return 0;
+}
+
+/*
+  Gamma string format:
+    VRP0 VRP1 PRP0 PRP1 PKP0 PKP1 PKP2 PKP3 PKP4 PKP5
+    VRN0 VRN1 PRN0 PRN1 PKN0 PKN1 PKN2 PKN3 PKN4 PKN5
+*/
+#define CURVE(num, idx)  curves[num*par->gamma.num_values + idx]
+static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+{
+       unsigned long mask[] = {
+               0b11111, 0b11111, 0b111, 0b111, 0b111,
+               0b111, 0b111, 0b111, 0b111, 0b111,
+               0b11111, 0b11111, 0b111, 0b111, 0b111,
+               0b111, 0b111, 0b111, 0b111, 0b111 };
+       int i, j;
+
+       fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+       /* apply mask */
+       for (i = 0; i < 2; i++)
+               for (j = 0; j < 10; j++)
+                       CURVE(i, j) &= mask[i*par->gamma.num_values + j];
+
+       write_reg(par, 0x0030, CURVE(0, 5) << 8 | CURVE(0, 4));
+       write_reg(par, 0x0031, CURVE(0, 7) << 8 | CURVE(0, 6));
+       write_reg(par, 0x0032, CURVE(0, 9) << 8 | CURVE(0, 8));
+       write_reg(par, 0x0033, CURVE(0, 3) << 8 | CURVE(0, 2));
+       write_reg(par, 0x0034, CURVE(1, 5) << 8 | CURVE(1, 4));
+       write_reg(par, 0x0035, CURVE(1, 7) << 8 | CURVE(1, 6));
+       write_reg(par, 0x0036, CURVE(1, 9) << 8 | CURVE(1, 8));
+       write_reg(par, 0x0037, CURVE(1, 3) << 8 | CURVE(1, 2));
+       write_reg(par, 0x003A, CURVE(0, 1) << 8 | CURVE(0, 0));
+       write_reg(par, 0x003B, CURVE(1, 1) << 8 | CURVE(1, 0));
+
+       return 0;
+}
+#undef CURVE
+
+
+static struct fbtft_display display = {
+       .regwidth = 16,
+       .width = WIDTH,
+       .height = HEIGHT,
+       .gamma_num = 2,
+       .gamma_len = 10,
+       .gamma = DEFAULT_GAMMA,
+       .fbtftops = {
+               .init_display = init_display,
+               .set_addr_win = set_addr_win,
+               .set_var = set_var,
+               .set_gamma = set_gamma,
+       },
+};
+FBTFT_REGISTER_DRIVER(DRVNAME, "solomon,ssd1289", &display);
+
+MODULE_ALIAS("spi:" DRVNAME);
+MODULE_ALIAS("platform:" DRVNAME);
+MODULE_ALIAS("spi:ssd1289");
+MODULE_ALIAS("platform:ssd1289");
+
+MODULE_DESCRIPTION("FB driver for the SSD1289 LCD Controller");
+MODULE_AUTHOR("Noralf Tronnes");
+MODULE_LICENSE("GPL");