/*
 * Driver for the Solomon SSD1307 OLED controler
 *
 * Copyright 2012 Free Electrons
 *
 * Licensed under the GPLv2 or later.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/i2c.h>
#include <linux/fb.h>
#include <linux/uaccess.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/pwm.h>
#include <linux/delay.h>

#define SSD1307FB_WIDTH			96
#define SSD1307FB_HEIGHT		16

#define SSD1307FB_DATA			0x40
#define SSD1307FB_COMMAND		0x80

#define SSD1307FB_CONTRAST		0x81
#define SSD1307FB_SEG_REMAP_ON		0xa1
#define SSD1307FB_DISPLAY_OFF		0xae
#define SSD1307FB_DISPLAY_ON		0xaf
#define SSD1307FB_START_PAGE_ADDRESS	0xb0

struct ssd1307fb_par {
	struct i2c_client *client;
	struct fb_info *info;
	struct pwm_device *pwm;
	u32 pwm_period;
	int reset;
};

static struct fb_fix_screeninfo ssd1307fb_fix = {
	.id		= "Solomon SSD1307",
	.type		= FB_TYPE_PACKED_PIXELS,
	.visual		= FB_VISUAL_MONO10,
	.xpanstep	= 0,
	.ypanstep	= 0,
	.ywrapstep	= 0,
	.line_length	= SSD1307FB_WIDTH / 8,
	.accel		= FB_ACCEL_NONE,
};

static struct fb_var_screeninfo ssd1307fb_var = {
	.xres		= SSD1307FB_WIDTH,
	.yres		= SSD1307FB_HEIGHT,
	.xres_virtual	= SSD1307FB_WIDTH,