A driver for the S6E63D6 SPI display controller from Samsung

This is a driver for the S6E63D6 SPI OLED display controller from Samsung.
It only provides access to controller's registers so the client can freely
configure it.

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
Acked-by: Anatolij Gustschin <agust@denx.de>

diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index 7fba29fbcce923ff55e1891b0ef2d99846030002..84d4cb79bd2c7e40d97cfc042872c804ff5f25fb 100644 (file)
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -28,6 +28,7 @@ LIB   := $(obj)libvideo.a
 COBJS-$(CONFIG_ATI_RADEON_FB) += ati_radeon_fb.o
 COBJS-$(CONFIG_ATMEL_LCD) += atmel_lcdfb.o
 COBJS-$(CONFIG_CFB_CONSOLE) += cfb_console.o
+COBJS-$(CONFIG_S6E63D6) += s6e63d6.o
 COBJS-$(CONFIG_VIDEO_CT69000) += ct69000.o
 COBJS-$(CONFIG_VIDEO_MB862xx) += mb862xx.o
 COBJS-$(CONFIG_VIDEO_SED13806) += sed13806.o

diff --git a/drivers/video/s6e63d6.c b/drivers/video/s6e63d6.c
new file mode 100644 (file)
index 0000000..d163506
--- /dev/null
+++ b/drivers/video/s6e63d6.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2009
+ * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <common.h>
+#include <spi.h>
+#include <s6e63d6.h>
+
+/*
+ * Each transfer is performed as:
+ * 1. chip-select active
+ * 2. send 8-bit start code
+ * 3. send 16-bit data
+ * 4. chip-select inactive
+ */
+static int send_word(struct s6e63d6 *data, u8 rs, u16 word)
+{
+       /*
+        * The start byte looks like (binary):
+        * 01110<ID><RS><R/W>
+        * RS is 0 for index or 1 for data, and R/W is 0 for write.
+        */
+       u32 buf8 = 0x70 | data->id | (rs & 2);
+       u32 buf16 = cpu_to_le16(word);
+       u32 buf_in;
+       int err;
+
+       err = spi_xfer(data->slave, 8, &buf8, &buf_in, SPI_XFER_BEGIN);
+       if (err)
+               return err;
+
+       return spi_xfer(data->slave, 16, &buf16, &buf_in, SPI_XFER_END);
+}
+
+/* Index and param differ in Register Select bit */
+int s6e63d6_index(struct s6e63d6 *data, u8 idx)
+{
+       return send_word(data, 0, idx);
+}
+
+int s6e63d6_param(struct s6e63d6 *data, u16 param)
+{
+       return send_word(data, 2, param);
+}
+
+int s6e63d6_init(struct s6e63d6 *data)
+{
+       if (data->id != 0 && data->id != 4) {
+               printf("s6e63d6: invalid ID %u\n", data->id);
+               return 1;
+       }
+
+       data->slave = spi_setup_slave(data->bus, data->cs, 100000, SPI_MODE_3);
+       if (!data->slave)
+               return 1;
+
+       return 0;
+}

diff --git a/include/s6e63d6.h b/include/s6e63d6.h
new file mode 100644 (file)
index 0000000..9f17fc0
--- /dev/null
+++ b/include/s6e63d6.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2009
+ * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#ifndef _S6E63D6_H_
+#define _S6E63D6_H_
+
+struct s6e63d6 {
+       unsigned int bus;
+       unsigned int cs;
+       unsigned int id;
+       struct spi_slave *slave;
+};
+
+extern int s6e63d6_init(struct s6e63d6 *data);
+extern int s6e63d6_index(struct s6e63d6 *data, u8 idx);
+extern int s6e63d6_param(struct s6e63d6 *data, u16 param);
+
+#endif