ODROID-M1S: add new board ODROID-M1S with Rockchip RK3566

Signed-off-by: Dongjin Kim <tobetter@gmail.com>
Signed-off-by: ckkim <changkon12@gmail.com>
Signed-off-by: Steve Jeong <steve@how2flow.net>
Change-Id: I88a7636892858b6cf9fc1c602b7b7b7707e4a3ea

arch/arm64/Kconfig.platforms

@@ -323,7 +323,7 @@ config ARCH_ROCKCHIP_ODROID_COMMON
 	bool
 
 config ARCH_ROCKCHIP_ODROIDM1
-	bool "Hardkernel's ODROID-M1 Single Board Computer"
+	bool "Hardkernel's ODROID-M1/M1S Single Board Computer"
 	select ARCH_ROCKCHIP_ODROID_COMMON
 	help
 	  This enables support for the board ODROID-M1 of Hardkernel

arch/arm64/boot/dts/rockchip/Makefile

@@ -215,5 +215,6 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588s-tablet-rk806-single-v10.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588s-tablet-v10.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588s-tablet-v11.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3568-odroid-m1.dtb
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3566-odroid-m1s.dtb
 
 subdir-$(CONFIG_ARCH_ROCKCHIP_ODROIDM1) += overlays/odroidm1

arch/arm64/configs/odroidm1_defconfig

@@ -3874,6 +3874,7 @@ CONFIG_FB_DEFERRED_IO=y
 # CONFIG_FB_SIMPLE is not set
 # CONFIG_FB_SSD1307 is not set
 # CONFIG_FB_SM712 is not set
+CONFIG_FB_SH1106=m
 # end of Frame buffer Devices
 
 #

drivers/video/fbdev/Kconfig

@@ -2236,6 +2236,20 @@ config FB_SM712
 	  called sm712fb. If you want to compile it as a module, say M
 	  here and read <file:Documentation/kbuild/modules.rst>.
 
+config FB_SH1106
+	tristate "Sino Wealth SH1106 framebuffer support"
+	depends on FB && I2C
+	depends on OF
+	depends on GPIOLIB || COMPILE_TEST
+	select FB_SYS_FOPS
+	select FB_SYS_FILLRECT
+	select FB_SYS_COPYAREA
+	select FB_SYS_IMAGEBLIT
+	select FB_DEFERRED_IO
+	help
+	  This driver implements support for the Sino Wealth SH1106
+	  OLED controller over I2C.
+
 source "drivers/video/fbdev/omap/Kconfig"
 source "drivers/video/fbdev/omap2/Kconfig"
 source "drivers/video/fbdev/mmp/Kconfig"

drivers/video/fbdev/Makefile

@@ -129,6 +129,7 @@ obj-$(CONFIG_FB_MX3)		  += mx3fb.o
 obj-$(CONFIG_FB_DA8XX)		  += da8xx-fb.o
 obj-$(CONFIG_FB_SSD1307)	  += ssd1307fb.o
 obj-$(CONFIG_FB_SIMPLE)           += simplefb.o
+obj-$(CONFIG_FB_SH1106)           += sh1106fb.o
 
 # the test framebuffer is last
 obj-$(CONFIG_FB_VIRTUAL)          += vfb.o

drivers/video/fbdev/sh1106fb.c

@@ -0,0 +1,626 @@
+/*
+ * Driver for the Sino Wealth SSD1307 OLED controller
+ *
+ * Copyright 2020 Dongjin Kim <tobetter@gmail.com>
+ *
+ * This version is based on :
+ *     linux/drivers/video/fbdevssd1307fb.c -- Solomon SSD1307 OLED controller
+ *
+ *     Copyright 2012 Free Electrons
+ *
+ * Licensed under the GPLv2 or later.
+ */
+
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/uaccess.h>
+
+#define SH1106_DATA			0x40
+#define SH1106_COMMAND			0x80
+
+#define SH1106_SET_ADDRESS_MODE		0x20
+#define SH1106_SET_ADDRESS_MODE_HORIZONTAL	(0x00)
+#define SH1106_SET_ADDRESS_MODE_VERTICAL	(0x01)
+#define SH1106_SET_ADDRESS_MODE_PAGE		(0x02)
+#define SH1106_SET_COL_RANGE		0x21
+#define SH1106_SET_PAGE_RANGE		0x22
+#define SH1106_CONTRAST			0x81
+#define SH1106_CHARGE_PUMP		0x8d
+#define SH1106_SEG_REMAP_ON		0xa1
+#define SH1106_DISPLAY_OFF		0xae
+#define SH1106_SET_MULTIPLEX_RATIO	0xa8
+#define SH1106_DISPLAY_ON		0xaf
+#define SH1106_START_PAGE_ADDRESS	0xb0
+#define SH1106_SET_DISPLAY_OFFSET	0xd3
+#define SH1106_SET_CLOCK_FREQ		0xd5
+#define SH1106_SET_PRECHARGE_PERIOD	0xd9
+#define SH1106_SET_COM_PINS_CONFIG	0xda
+#define SH1106_SET_VCOMH		0xdb
+
+#define MAX_CONTRAST			255
+
+#define REFRESHRATE			20
+
+static u_int refreshrate = REFRESHRATE;
+module_param(refreshrate, uint, 0);
+
+static u_int rotate;
+module_param(rotate, uint, 0);
+
+struct sh1106fb_par;
+
+struct sh1106fb_deviceinfo {
+	u32 default_vcomh;
+	u32 default_dclk_div;
+	u32 default_dclk_frq;
+	int need_chargepump;
+};
+
+struct sh1106fb_par {
+	u32 com_invdir;
+	u32 com_lrremap;
+	u32 com_offset;
+	u32 com_seq;
+	u32 contrast;
+	u32 dclk_div;
+	u32 dclk_frq;
+	const struct sh1106fb_deviceinfo *device_info;
+	struct i2c_client *client;
+	u32 height;
+	struct fb_info *info;
+	u32 page_offset;
+	u32 prechargep1;
+	u32 prechargep2;
+	u32 seg_remap;
+	u32 vcomh;
+	u32 width;
+	u32 rotate;
+};
+
+struct sh1106fb_array {
+	u8	type;
+	u8	data[0];
+};
+
+static const struct fb_fix_screeninfo sh1106fb_fix = {
+	.id		= "SH1106 OLED",
+	.type		= FB_TYPE_PACKED_PIXELS,
+	.visual		= FB_VISUAL_MONO10,
+	.xpanstep	= 0,
+	.ypanstep	= 0,
+	.ywrapstep	= 0,
+	.accel		= FB_ACCEL_NONE,
+};
+
+static const struct fb_var_screeninfo sh1106fb_var = {
+	.bits_per_pixel	= 1,
+};
+
+static struct sh1106fb_array *sh1106fb_alloc_array(u32 len, u8 type)
+{
+	struct sh1106fb_array *array;
+
+	array = kzalloc(sizeof(struct sh1106fb_array) + len, GFP_KERNEL);
+	if (!array)
+		return NULL;
+
+	array->type = type;
+
+	return array;
+}
+
+static int sh1106fb_write_array(struct i2c_client *client,
+				 struct sh1106fb_array *array, u32 len)
+{
+	int ret;
+
+	len += sizeof(struct sh1106fb_array);
+
+	ret = i2c_master_send(client, (u8 *)array, len);
+	if (ret != len) {
+		dev_err(&client->dev, "Couldn't send I2C command.\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static inline int sh1106fb_write_cmd(struct i2c_client *client, u8 cmd)
+{
+	struct sh1106fb_array *array;
+	int ret;
+
+	array = sh1106fb_alloc_array(1, SH1106_COMMAND);
+	if (!array)
+		return -ENOMEM;
+
+	array->data[0] = cmd;
+
+	ret = sh1106fb_write_array(client, array, 1);
+	kfree(array);
+
+	return ret;
+}
+
+static void sh1106fb_update_display(struct sh1106fb_par *par)
+{
+	struct sh1106fb_array *array;
+	u8 *vmem = par->info->screen_base;
+	int i, j, k;
+
+	array = sh1106fb_alloc_array(par->width * par->height / 8,
+				      SH1106_DATA);
+	if (!array)
+		return;
+
+	/*
+	 * The screen is divided in pages, each having a height of 8
+	 * pixels, and the width of the screen. When sending a byte of
+	 * data to the controller, it gives the 8 bits for the current
+	 * column. I.e, the first byte are the 8 bits of the first
+	 * column, then the 8 bits for the second column, etc.
+	 *
+	 *
+	 * Representation of the screen, assuming it is 5 bits
+	 * wide. Each letter-number combination is a bit that controls
+	 * one pixel.
+	 *
+	 * A0 A1 A2 A3 A4
+	 * B0 B1 B2 B3 B4
+	 * C0 C1 C2 C3 C4
+	 * D0 D1 D2 D3 D4
+	 * E0 E1 E2 E3 E4
+	 * F0 F1 F2 F3 F4
+	 * G0 G1 G2 G3 G4
+	 * H0 H1 H2 H3 H4
+	 *
+	 * If you want to update this screen, you need to send 5 bytes:
+	 *  (1) A0 B0 C0 D0 E0 F0 G0 H0
+	 *  (2) A1 B1 C1 D1 E1 F1 G1 H1
+	 *  (3) A2 B2 C2 D2 E2 F2 G2 H2
+	 *  (4) A3 B3 C3 D3 E3 F3 G3 H3
+	 *  (5) A4 B4 C4 D4 E4 F4 G4 H4
+	 */
+
+	if (par->rotate == 0) {
+		for (i = 0; i < (par->height / 8); i++) {
+			for (j = 0; j < par->width; j++) {
+				u32 array_idx = i * par->width + j;
+
+				array->data[array_idx] = 0;
+				for (k = 0; k < 8; k++) {
+					u32 page_length = par->width * i;
+					u32 index = page_length + (par->width * k + j) / 8;
+					u8 byte = *(vmem + index);
+					u8 bit = byte & (1 << (j % 8));
+					bit = bit >> (j % 8);
+					array->data[array_idx] |= bit << k;
+				}
+			}
+		}
+	} else if (par->rotate == 180) {
+		for (i = 0; i < (par->height / 8); i++) {
+			for (j = 0; j < par->width; j++) {
+				u32 array_idx = i * par->width + j;
+
+				array->data[array_idx] = 0;
+				for (k = 0; k < 8; k++) {
+					u32 page_length = par->width * (7 - i);
+					u32 index = page_length + (par->width * (7 - k) + j) / 8;
+					u8 byte = *(vmem + index);
+					u8 bit = byte & (1 << (j % 8));
+					bit = bit >> (j % 8);
+					array->data[array_idx] |= bit << k;
+				}
+			}
+		}
+	}
+
+	sh1106fb_write_array(par->client, array, par->width * par->height / 8);
+	kfree(array);
+}
+
+static ssize_t sh1106fb_write(struct fb_info *info, const char __user *buf,
+		size_t count, loff_t *ppos)
+{
+	struct sh1106fb_par *par = info->par;
+	unsigned long total_size;
+	unsigned long p = *ppos;
+	u8 __iomem *dst;
+
+	total_size = info->fix.smem_len;
+
+	if (p > total_size)
+		return -EINVAL;
+
+	if (count + p > total_size)
+		count = total_size - p;
+
+	if (!count)
+		return -EINVAL;
+
+	dst = (void __force *) (info->screen_base + p);
+
+	if (copy_from_user(dst, buf, count))
+		return -EFAULT;
+
+	sh1106fb_update_display(par);
+
+	*ppos += count;
+
+	return count;
+}
+
+static int sh1106fb_blank(int blank_mode, struct fb_info *info)
+{
+	struct sh1106fb_par *par = info->par;
+
+	if (blank_mode != FB_BLANK_UNBLANK)
+		return sh1106fb_write_cmd(par->client, SH1106_DISPLAY_OFF);
+	else
+		return sh1106fb_write_cmd(par->client, SH1106_DISPLAY_ON);
+}
+
+static void sh1106fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
+{
+	struct sh1106fb_par *par = info->par;
+	sys_fillrect(info, rect);
+	sh1106fb_update_display(par);
+}
+
+static void sh1106fb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
+{
+	struct sh1106fb_par *par = info->par;
+	sys_copyarea(info, area);
+	sh1106fb_update_display(par);
+}
+
+static void sh1106fb_imageblit(struct fb_info *info, const struct fb_image *image)
+{
+	struct sh1106fb_par *par = info->par;
+	sys_imageblit(info, image);
+	sh1106fb_update_display(par);
+}
+
+static struct fb_ops sh1106fb_ops = {
+	.owner		= THIS_MODULE,
+	.fb_read	= fb_sys_read,
+	.fb_write	= sh1106fb_write,
+	.fb_blank	= sh1106fb_blank,
+	.fb_fillrect	= sh1106fb_fillrect,
+	.fb_copyarea	= sh1106fb_copyarea,
+	.fb_imageblit	= sh1106fb_imageblit,
+};
+
+static void sh1106fb_deferred_io(struct fb_info *info,
+				struct list_head *pagelist)
+{
+	sh1106fb_update_display(info->par);
+}
+
+static int sh1106fb_init(struct sh1106fb_par *par)
+{
+	int ret;
+	u32 precharge, dclk, com_invdir, compins;
+
+	/* Set initial contrast */
+	ret = sh1106fb_write_cmd(par->client, SH1106_CONTRAST);
+	if (ret < 0)
+		return ret;
+
+	ret = sh1106fb_write_cmd(par->client, par->contrast);
+	if (ret < 0)
+		return ret;
+
+	/* Set segment re-map */
+	if (par->seg_remap) {
+		ret = sh1106fb_write_cmd(par->client, SH1106_SEG_REMAP_ON);
+		if (ret < 0)
+			return ret;
+	};
+
+	/* Set COM direction */
+	com_invdir = 0xc0 | (par->com_invdir & 0x1) << 3;
+	ret = sh1106fb_write_cmd(par->client,  com_invdir);
+	if (ret < 0)
+		return ret;
+
+	/* Set multiplex ratio value */
+	ret = sh1106fb_write_cmd(par->client, SH1106_SET_MULTIPLEX_RATIO);
+	if (ret < 0)
+		return ret;
+
+	ret = sh1106fb_write_cmd(par->client, par->height - 1);
+	if (ret < 0)
+		return ret;
+
+	/* set display offset value */
+	ret = sh1106fb_write_cmd(par->client, SH1106_SET_DISPLAY_OFFSET);
+	if (ret < 0)
+		return ret;
+
+	ret = sh1106fb_write_cmd(par->client, par->com_offset);
+	if (ret < 0)
+		return ret;
+
+	/* Set clock frequency */
+	ret = sh1106fb_write_cmd(par->client, SH1106_SET_CLOCK_FREQ);
+	if (ret < 0)
+		return ret;
+
+	dclk = ((par->dclk_div - 1) & 0xf) | (par->dclk_frq & 0xf) << 4;
+	ret = sh1106fb_write_cmd(par->client, dclk);
+	if (ret < 0)
+		return ret;
+
+	/* Set precharge period in number of ticks from the internal clock */
+	ret = sh1106fb_write_cmd(par->client, SH1106_SET_PRECHARGE_PERIOD);
+	if (ret < 0)
+		return ret;
+
+	precharge = (par->prechargep1 & 0xf) | (par->prechargep2 & 0xf) << 4;
+	ret = sh1106fb_write_cmd(par->client, precharge);
+	if (ret < 0)
+		return ret;
+
+	/* Set COM pins configuration */
+	ret = sh1106fb_write_cmd(par->client, SH1106_SET_COM_PINS_CONFIG);
+	if (ret < 0)
+		return ret;
+
+	compins = 0x02 | !(par->com_seq & 0x1) << 4
+				   | (par->com_lrremap & 0x1) << 5;
+	ret = sh1106fb_write_cmd(par->client, compins);
+	if (ret < 0)
+		return ret;
+
+	/* Set VCOMH */
+	ret = sh1106fb_write_cmd(par->client, SH1106_SET_VCOMH);
+	if (ret < 0)
+		return ret;
+
+	ret = sh1106fb_write_cmd(par->client, par->vcomh);
+	if (ret < 0)
+		return ret;
+
+	/* Turn on the DC-DC Charge Pump */
+	ret = sh1106fb_write_cmd(par->client, SH1106_CHARGE_PUMP);
+	if (ret < 0)
+		return ret;
+
+	ret = sh1106fb_write_cmd(par->client,
+		BIT(4) | (par->device_info->need_chargepump ? BIT(2) : 0));
+	if (ret < 0)
+		return ret;
+
+	/* Switch to horizontal addressing mode */
+	ret = sh1106fb_write_cmd(par->client, SH1106_SET_ADDRESS_MODE);
+	if (ret < 0)
+		return ret;
+
+	ret = sh1106fb_write_cmd(par->client,
+				  SH1106_SET_ADDRESS_MODE_HORIZONTAL);
+	if (ret < 0)
+		return ret;
+
+	/* Set column range */
+	ret = sh1106fb_write_cmd(par->client, SH1106_SET_COL_RANGE);
+	if (ret < 0)
+		return ret;
+
+	ret = sh1106fb_write_cmd(par->client, 0x0);
+	if (ret < 0)
+		return ret;
+
+	ret = sh1106fb_write_cmd(par->client, par->width - 1);
+	if (ret < 0)
+		return ret;
+
+	/* Set page range */
+	ret = sh1106fb_write_cmd(par->client, SH1106_SET_PAGE_RANGE);
+	if (ret < 0)
+		return ret;
+
+	ret = sh1106fb_write_cmd(par->client, par->page_offset);
+	if (ret < 0)
+		return ret;
+
+	ret = sh1106fb_write_cmd(par->client,
+				  par->page_offset + (par->height / 8) - 1);
+	if (ret < 0)
+		return ret;
+
+	/* Turn on the display */
+	ret = sh1106fb_write_cmd(par->client, SH1106_DISPLAY_ON);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static struct sh1106fb_deviceinfo sh1106fb_sh1106_deviceinfo = {
+	.default_vcomh = 0x40,
+	.default_dclk_div = 2,
+	.default_dclk_frq = 12,
+	.need_chargepump = 1,
+};
+
+static const struct of_device_id sh1106fb_of_match[] = {
+	{
+		.compatible = "sinowealth,sh1106-i2c",
+		.data = (void *)&sh1106fb_sh1106_deviceinfo,
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, sh1106fb_of_match);
+
+static int sh1106fb_probe(struct i2c_client *client,
+			   const struct i2c_device_id *id)
+{
+	struct fb_info *info;
+	struct device_node *node = client->dev.of_node;
+	struct fb_deferred_io *sh1106fb_defio;
+	u32 vmem_size;
+	struct sh1106fb_par *par;
+	u8 *vmem;
+	int ret;
+
+	if (!node) {
+		dev_err(&client->dev, "No device tree data found!\n");
+		return -EINVAL;
+	}
+
+	info = framebuffer_alloc(sizeof(struct sh1106fb_par), &client->dev);
+	if (!info) {
+		dev_err(&client->dev, "Couldn't allocate framebuffer.\n");
+		return -ENOMEM;
+	}
+
+	par = info->par;
+	par->info = info;
+	par->client = client;
+
+	par->device_info = of_device_get_match_data(&client->dev);
+
+	if (of_property_read_u32(node, "width", &par->width))
+		par->width = 96;
+
+	if (of_property_read_u32(node, "height", &par->height))
+		par->height = 16;
+
+	if (of_property_read_u32(node, "page-offset", &par->page_offset))
+		par->page_offset = 0;
+
+	if (of_property_read_u32(node, "com-offset", &par->com_offset))
+		par->com_offset = 0;
+
+	if (of_property_read_u32(node, "prechargep1", &par->prechargep1))
+		par->prechargep1 = 2;
+
+	if (of_property_read_u32(node, "prechargep2", &par->prechargep2))
+		par->prechargep2 = 2;
+
+	if (of_property_read_u32(node, "rotate", &par->rotate))
+		par->rotate = rotate;
+
+	par->seg_remap = !of_property_read_bool(node, "segment-no-remap");
+	par->com_seq = of_property_read_bool(node, "com-seq");
+	par->com_lrremap = of_property_read_bool(node, "com-lrremap");
+	par->com_invdir = of_property_read_bool(node, "com-invdir");
+
+	par->contrast = 127;
+	par->vcomh = par->device_info->default_vcomh;
+
+	/* Setup display timing */
+	par->dclk_div = par->device_info->default_dclk_div;
+	par->dclk_frq = par->device_info->default_dclk_frq;
+
+	vmem_size = par->width * par->height / 8;
+
+	vmem = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
+					get_order(vmem_size));
+	if (!vmem) {
+		dev_err(&client->dev, "Couldn't allocate graphical memory.\n");
+		ret = -ENOMEM;
+		goto fb_alloc_error;
+	}
+
+	sh1106fb_defio = devm_kzalloc(&client->dev, sizeof(struct fb_deferred_io), GFP_KERNEL);
+	if (!sh1106fb_defio) {
+		dev_err(&client->dev, "Couldn't allocate deferred io.\n");
+		ret = -ENOMEM;
+		goto fb_alloc_error;
+	}
+
+	sh1106fb_defio->delay = HZ / refreshrate;
+	sh1106fb_defio->deferred_io = sh1106fb_deferred_io;
+
+	info->fbops = &sh1106fb_ops;
+	info->fix = sh1106fb_fix;
+	info->fix.line_length = par->width / 8;
+	info->fbdefio = sh1106fb_defio;
+
+	info->var = sh1106fb_var;
+	info->var.xres = par->width;
+	info->var.xres_virtual = par->width;
+	info->var.yres = par->height;
+	info->var.yres_virtual = par->height;
+
+	info->var.red.length = 1;
+	info->var.red.offset = 0;
+	info->var.green.length = 1;
+	info->var.green.offset = 0;
+	info->var.blue.length = 1;
+	info->var.blue.offset = 0;
+
+	info->screen_base = (u8 __force __iomem *)vmem;
+	info->fix.smem_start = __pa(vmem);
+	info->fix.smem_len = vmem_size;
+
+	fb_deferred_io_init(info);
+
+	i2c_set_clientdata(client, info);
+
+	ret = sh1106fb_init(par);
+	if (ret)
+		goto reset_oled_error;
+
+	ret = register_framebuffer(info);
+	if (ret) {
+		dev_err(&client->dev, "Couldn't register the framebuffer\n");
+		goto panel_init_error;
+	}
+
+	dev_info(&client->dev, "fb%d: %s framebuffer device registered, using %d bytes of video memory\n", info->node, info->fix.id, vmem_size);
+
+	return 0;
+
+panel_init_error:
+reset_oled_error:
+	fb_deferred_io_cleanup(info);
+fb_alloc_error:
+	framebuffer_release(info);
+	return ret;
+}
+
+static int sh1106fb_remove(struct i2c_client *client)
+{
+	struct fb_info *info = i2c_get_clientdata(client);
+	struct sh1106fb_par *par = info->par;
+
+	sh1106fb_write_cmd(par->client, SH1106_DISPLAY_OFF);
+
+	unregister_framebuffer(info);
+	fb_deferred_io_cleanup(info);
+	__free_pages(__va(info->fix.smem_start), get_order(info->fix.smem_len));
+	framebuffer_release(info);
+
+	return 0;
+}
+
+static const struct i2c_device_id sh1106fb_i2c_id[] = {
+	{ "sh1106fb", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, sh1106fb_i2c_id);
+
+static struct i2c_driver sh1106fb_driver = {
+	.probe = sh1106fb_probe,
+	.remove = sh1106fb_remove,
+	.id_table = sh1106fb_i2c_id,
+	.driver = {
+		.name = "sh1106fb",
+		.of_match_table = sh1106fb_of_match,
+	},
+};
+
+module_i2c_driver(sh1106fb_driver);
+
+MODULE_DESCRIPTION("FB driver for the Sino Wealth SH1106 OLED controller");
+MODULE_AUTHOR("Dongjin Kim <tobetter@gmail.com>");
+MODULE_LICENSE("GPL");