staging: fbtft: add fb_ssd1331 driver
authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Wed, 31 Dec 2014 09:11:27 +0000 (10:11 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sun, 18 Jan 2015 00:46:47 +0000 (16:46 -0800)
This commit adds the fb_ssd1331 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>
drivers/staging/fbtft/Kconfig
drivers/staging/fbtft/Makefile
drivers/staging/fbtft/fb_ssd1331.c [new file with mode: 0644]

index 3ae8259d5b0cf3d5813e8e1d40ecadfca365ba70..f1e48326ad3a63cda8058dcaa0788b70f587d77c 100644 (file)
@@ -109,3 +109,9 @@ config FB_TFT_SSD1306
        depends on FB_TFT
        help
          Framebuffer support for SSD1306
+
+config FB_TFT_SSD1331
+       tristate "FB driver for the SSD1331 LCD Controller"
+       depends on FB_TFT
+       help
+         Framebuffer support for SSD1331
index b612a4d4f97cdbb4ce7f26e369bd922485614b53..8dffb752c1edcb603e34aff388c783bd68e34dd9 100644 (file)
@@ -20,3 +20,4 @@ obj-$(CONFIG_FB_TFT_S6D02A1)     += fb_s6d02a1.o
 obj-$(CONFIG_FB_TFT_S6D1121)     += fb_s6d1121.o
 obj-$(CONFIG_FB_TFT_SSD1289)     += fb_ssd1289.o
 obj-$(CONFIG_FB_TFT_SSD1306)     += fb_ssd1306.o
+obj-$(CONFIG_FB_TFT_SSD1331)     += fb_ssd1331.o
diff --git a/drivers/staging/fbtft/fb_ssd1331.c b/drivers/staging/fbtft/fb_ssd1331.c
new file mode 100644 (file)
index 0000000..da7464f
--- /dev/null
@@ -0,0 +1,205 @@
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/gpio.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)
+{
+       fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+       par->fbtftops.reset(par);
+
+       write_reg(par, 0xae); /* Display Off */
+       write_reg(par, 0xa0, 0x70 | (par->bgr << 2)); /* Set Colour Depth */
+       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)
+{
+       fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par,
+               "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, 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 = (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 (par->gpio.dc != -1)
+               gpio_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, "%s: write() failed and returned %d\n", __func__, 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, "%s: write() failed and returned %d\n", __func__, ret);
+                       return;
+               }
+       }
+       if (par->gpio.dc != -1)
+               gpio_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, unsigned long *curves)
+{
+       unsigned long tmp[GAMMA_NUM * GAMMA_LEN];
+       int i, acc = 0;
+
+       fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+       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(blank=%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");