drivers/video/hecubafb.c - kernel/msm-4.9 - Gitiles

 /*
  * linux/drivers/video/hecubafb.c -- FB driver for Hecuba/Apollo controller
  *
  * Copyright (C) 2006, Jaya Kumar
  * This work was sponsored by CIS(M) Sdn Bhd
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License. See the file COPYING in the main directory of this archive for
  * more details.
  *
  * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
  * This work was possible because of apollo display code from E-Ink's website
  * http://support.eink.com/community
  * All information used to write this code is from public material made
  * available by E-Ink on its support site. Some commands such as 0xA4
  * were found by looping through cmd=0x00 thru 0xFF and supplying random
  * values. There are other commands that the display is capable of,
  * beyond the 5 used here but they are more complex.
  *
  * This driver is written to be used with the Hecuba display architecture.
  * The actual display chip is called Apollo and the interface electronics
  * it needs is called Hecuba.
  *
  * It is intended to be architecture independent. A board specific driver
  * must be used to perform all the physical IO interactions. An example
  * is provided as n411.c
  *
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/mm.h>
 #include <linux/vmalloc.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/fb.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/list.h>
 #include <linux/uaccess.h>

 #include <video/hecubafb.h>

 /* Display specific information */
 #define DPY_W 600
 #define DPY_H 800

 static struct fb_fix_screeninfo hecubafb_fix = {
 	.id =		"hecubafb",
 	.type =		FB_TYPE_PACKED_PIXELS,
 	.visual =	FB_VISUAL_MONO01,
 	.xpanstep =	0,
 	.ypanstep =	0,
 	.ywrapstep =	0,
 	.line_length =	DPY_W,
 	.accel =	FB_ACCEL_NONE,
 };

 static struct fb_var_screeninfo hecubafb_var = {
 	.xres		= DPY_W,
 	.yres		= DPY_H,
 	.xres_virtual	= DPY_W,
 	.yres_virtual	= DPY_H,
 	.bits_per_pixel	= 1,
 	.nonstd		= 1,
 };

 /* main hecubafb functions */

 static void apollo_send_data(struct hecubafb_par *par, unsigned char data)
 {
 	/* set data */
 	par->board->set_data(par, data);

 	/* set DS low */
 	par->board->set_ctl(par, HCB_DS_BIT, 0);

 	/* wait for ack */
 	par->board->wait_for_ack(par, 0);

 	/* set DS hi */
 	par->board->set_ctl(par, HCB_DS_BIT, 1);

 	/* wait for ack to clear */
 	par->board->wait_for_ack(par, 1);
 }

 static void apollo_send_command(struct hecubafb_par *par, unsigned char data)
 {
 	/* command so set CD to high */
 	par->board->set_ctl(par, HCB_CD_BIT, 1);

 	/* actually strobe with command */
 	apollo_send_data(par, data);

 	/* clear CD back to low */
 	par->board->set_ctl(par, HCB_CD_BIT, 0);
 }

 static void hecubafb_dpy_update(struct hecubafb_par *par)
 {
 	int i;
 	unsigned char *buf = (unsigned char __force *)par->info->screen_base;

 	apollo_send_command(par, APOLLO_START_NEW_IMG);

 	for (i=0; i < (DPY_W*DPY_H/8); i++) {
 		apollo_send_data(par, *(buf++));
 	}

 	apollo_send_command(par, APOLLO_STOP_IMG_DATA);
 	apollo_send_command(par, APOLLO_DISPLAY_IMG);
 }

 /* this is called back from the deferred io workqueue */
 static void hecubafb_dpy_deferred_io(struct fb_info *info,
 				struct list_head *pagelist)
 {
 	hecubafb_dpy_update(info->par);
 }

 static void hecubafb_fillrect(struct fb_info *info,
 				   const struct fb_fillrect *rect)
 {
 	struct hecubafb_par *par = info->par;

 	sys_fillrect(info, rect);

 	hecubafb_dpy_update(par);
 }

 static void hecubafb_copyarea(struct fb_info *info,
 				   const struct fb_copyarea *area)
 {
 	struct hecubafb_par *par = info->par;

 	sys_copyarea(info, area);

 	hecubafb_dpy_update(par);
 }

 static void hecubafb_imageblit(struct fb_info *info,
 				const struct fb_image *image)
 {
 	struct hecubafb_par *par = info->par;

 	sys_imageblit(info, image);

 	hecubafb_dpy_update(par);
 }

 /*
  * this is the slow path from userspace. they can seek and write to
  * the fb. it's inefficient to do anything less than a full screen draw
  */
 static ssize_t hecubafb_write(struct fb_info *info, const char __user *buf,
 				size_t count, loff_t *ppos)
 {
 	struct hecubafb_par *par = info->par;
 	unsigned long p = *ppos;
 	void *dst;
 	int err = 0;
 	unsigned long total_size;

 	if (info->state != FBINFO_STATE_RUNNING)
 		return -EPERM;

 	total_size = info->fix.smem_len;

 	if (p > total_size)
 		return -EFBIG;

 	if (count > total_size) {
 		err = -EFBIG;
 		count = total_size;
 	}

 	if (count + p > total_size) {
 		if (!err)
 			err = -ENOSPC;

 		count = total_size - p;
 	}

 	dst = (void __force *) (info->screen_base + p);

 	if (copy_from_user(dst, buf, count))
 		err = -EFAULT;

 	if  (!err)
 		*ppos += count;

 	hecubafb_dpy_update(par);

 	return (err) ? err : count;
 }

 static struct fb_ops hecubafb_ops = {
 	.owner		= THIS_MODULE,
 	.fb_read        = fb_sys_read,
 	.fb_write	= hecubafb_write,
 	.fb_fillrect	= hecubafb_fillrect,
 	.fb_copyarea	= hecubafb_copyarea,
 	.fb_imageblit	= hecubafb_imageblit,
 };

 static struct fb_deferred_io hecubafb_defio = {
 	.delay		= HZ,
 	.deferred_io	= hecubafb_dpy_deferred_io,
 };

 static int hecubafb_probe(struct platform_device *dev)
 {
 	struct fb_info *info;
 	struct hecuba_board *board;
 	int retval = -ENOMEM;
 	int videomemorysize;
 	unsigned char *videomemory;
 	struct hecubafb_par *par;

 	/* pick up board specific routines */
 	board = dev->dev.platform_data;
 	if (!board)
 		return -EINVAL;

 	/* try to count device specific driver, if can't, platform recalls */
 	if (!try_module_get(board->owner))
 		return -ENODEV;

 	videomemorysize = (DPY_W*DPY_H)/8;

 	videomemory = vzalloc(videomemorysize);
 	if (!videomemory)
 		goto err_videomem_alloc;

 	info = framebuffer_alloc(sizeof(struct hecubafb_par), &dev->dev);
 	if (!info)
 		goto err_fballoc;

 	info->screen_base = (char __force __iomem *)videomemory;
 	info->fbops = &hecubafb_ops;

 	info->var = hecubafb_var;
 	info->fix = hecubafb_fix;
 	info->fix.smem_len = videomemorysize;
 	par = info->par;
 	par->info = info;
 	par->board = board;
 	par->send_command = apollo_send_command;
 	par->send_data = apollo_send_data;

 	info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;

 	info->fbdefio = &hecubafb_defio;
 	fb_deferred_io_init(info);

 	retval = register_framebuffer(info);
 	if (retval < 0)
 		goto err_fbreg;
 	platform_set_drvdata(dev, info);

 	printk(KERN_INFO
 	       "fb%d: Hecuba frame buffer device, using %dK of video memory\n",
 	       info->node, videomemorysize >> 10);

 	/* this inits the dpy */
 	retval = par->board->init(par);
 	if (retval < 0)
 		goto err_fbreg;

 	return 0;
 err_fbreg:
 	framebuffer_release(info);
 err_fballoc:
 	vfree(videomemory);
 err_videomem_alloc:
 	module_put(board->owner);
 	return retval;
 }

 static int hecubafb_remove(struct platform_device *dev)
 {
 	struct fb_info *info = platform_get_drvdata(dev);

 	if (info) {
 		struct hecubafb_par *par = info->par;
 		fb_deferred_io_cleanup(info);
 		unregister_framebuffer(info);
 		vfree((void __force *)info->screen_base);
 		if (par->board->remove)
 			par->board->remove(par);
 		module_put(par->board->owner);
 		framebuffer_release(info);
 	}
 	return 0;
 }

 static struct platform_driver hecubafb_driver = {
 	.probe	= hecubafb_probe,
 	.remove = hecubafb_remove,
 	.driver	= {
 		.owner	= THIS_MODULE,
 		.name	= "hecubafb",
 	},
 };

 static int __init hecubafb_init(void)
 {
 	return platform_driver_register(&hecubafb_driver);
 }

 static void __exit hecubafb_exit(void)
 {
 	platform_driver_unregister(&hecubafb_driver);
 }

 module_init(hecubafb_init);
 module_exit(hecubafb_exit);

 MODULE_DESCRIPTION("fbdev driver for Hecuba/Apollo controller");
 MODULE_AUTHOR("Jaya Kumar");
 MODULE_LICENSE("GPL");
	/*
	* linux/drivers/video/hecubafb.c -- FB driver for Hecuba/Apollo controller
	*
	* Copyright (C) 2006, Jaya Kumar
	* This work was sponsored by CIS(M) Sdn Bhd
	*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file COPYING in the main directory of this archive for
	* more details.
	*
	* Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
	* This work was possible because of apollo display code from E-Ink's website
	* http://support.eink.com/community
	* All information used to write this code is from public material made
	* available by E-Ink on its support site. Some commands such as 0xA4
	* were found by looping through cmd=0x00 thru 0xFF and supplying random
	* values. There are other commands that the display is capable of,
	* beyond the 5 used here but they are more complex.
	*
	* This driver is written to be used with the Hecuba display architecture.
	* The actual display chip is called Apollo and the interface electronics
	* it needs is called Hecuba.
	*
	* It is intended to be architecture independent. A board specific driver
	* must be used to perform all the physical IO interactions. An example
	* is provided as n411.c
	*
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/string.h>
	#include <linux/mm.h>
	#include <linux/vmalloc.h>
	#include <linux/delay.h>
	#include <linux/interrupt.h>
	#include <linux/fb.h>
	#include <linux/init.h>
	#include <linux/platform_device.h>
	#include <linux/list.h>
	#include <linux/uaccess.h>

	#include <video/hecubafb.h>

	/* Display specific information */
	#define DPY_W 600
	#define DPY_H 800

	static struct fb_fix_screeninfo hecubafb_fix = {
	.id = "hecubafb",
	.type = FB_TYPE_PACKED_PIXELS,
	.visual = FB_VISUAL_MONO01,
	.xpanstep = 0,
	.ypanstep = 0,
	.ywrapstep = 0,
	.line_length = DPY_W,
	.accel = FB_ACCEL_NONE,
	};

	static struct fb_var_screeninfo hecubafb_var = {
	.xres = DPY_W,
	.yres = DPY_H,
	.xres_virtual = DPY_W,
	.yres_virtual = DPY_H,
	.bits_per_pixel = 1,
	.nonstd = 1,
	};

	/* main hecubafb functions */

	static void apollo_send_data(struct hecubafb_par *par, unsigned char data)
	{
	/* set data */
	par->board->set_data(par, data);

	/* set DS low */
	par->board->set_ctl(par, HCB_DS_BIT, 0);

	/* wait for ack */
	par->board->wait_for_ack(par, 0);

	/* set DS hi */
	par->board->set_ctl(par, HCB_DS_BIT, 1);

	/* wait for ack to clear */
	par->board->wait_for_ack(par, 1);
	}

	static void apollo_send_command(struct hecubafb_par *par, unsigned char data)
	{
	/* command so set CD to high */
	par->board->set_ctl(par, HCB_CD_BIT, 1);

	/* actually strobe with command */
	apollo_send_data(par, data);

	/* clear CD back to low */
	par->board->set_ctl(par, HCB_CD_BIT, 0);
	}

	static void hecubafb_dpy_update(struct hecubafb_par *par)
	{
	int i;
	unsigned char buf = (unsigned char __force )par->info->screen_base;

	apollo_send_command(par, APOLLO_START_NEW_IMG);

	for (i=0; i < (DPY_W*DPY_H/8); i++) {
	apollo_send_data(par, *(buf++));
	}

	apollo_send_command(par, APOLLO_STOP_IMG_DATA);
	apollo_send_command(par, APOLLO_DISPLAY_IMG);
	}

	/* this is called back from the deferred io workqueue */
	static void hecubafb_dpy_deferred_io(struct fb_info *info,
	struct list_head *pagelist)
	{
	hecubafb_dpy_update(info->par);
	}

	static void hecubafb_fillrect(struct fb_info *info,
	const struct fb_fillrect *rect)
	{
	struct hecubafb_par *par = info->par;

	sys_fillrect(info, rect);

	hecubafb_dpy_update(par);
	}

	static void hecubafb_copyarea(struct fb_info *info,
	const struct fb_copyarea *area)
	{
	struct hecubafb_par *par = info->par;

	sys_copyarea(info, area);

	hecubafb_dpy_update(par);
	}

	static void hecubafb_imageblit(struct fb_info *info,
	const struct fb_image *image)
	{
	struct hecubafb_par *par = info->par;

	sys_imageblit(info, image);

	hecubafb_dpy_update(par);
	}

	/*
	* this is the slow path from userspace. they can seek and write to
	* the fb. it's inefficient to do anything less than a full screen draw
	*/
	static ssize_t hecubafb_write(struct fb_info info, const char __user buf,
	size_t count, loff_t *ppos)
	{
	struct hecubafb_par *par = info->par;
	unsigned long p = *ppos;
	void *dst;
	int err = 0;
	unsigned long total_size;

	if (info->state != FBINFO_STATE_RUNNING)
	return -EPERM;

	total_size = info->fix.smem_len;

	if (p > total_size)
	return -EFBIG;

	if (count > total_size) {
	err = -EFBIG;
	count = total_size;
	}

	if (count + p > total_size) {
	if (!err)
	err = -ENOSPC;

	count = total_size - p;
	}

	dst = (void __force *) (info->screen_base + p);

	if (copy_from_user(dst, buf, count))
	err = -EFAULT;

	if (!err)
	*ppos += count;

	hecubafb_dpy_update(par);

	return (err) ? err : count;
	}

	static struct fb_ops hecubafb_ops = {
	.owner = THIS_MODULE,
	.fb_read = fb_sys_read,
	.fb_write = hecubafb_write,
	.fb_fillrect = hecubafb_fillrect,
	.fb_copyarea = hecubafb_copyarea,
	.fb_imageblit = hecubafb_imageblit,
	};

	static struct fb_deferred_io hecubafb_defio = {
	.delay = HZ,
	.deferred_io = hecubafb_dpy_deferred_io,
	};

	static int hecubafb_probe(struct platform_device *dev)
	{
	struct fb_info *info;
	struct hecuba_board *board;
	int retval = -ENOMEM;
	int videomemorysize;
	unsigned char *videomemory;
	struct hecubafb_par *par;

	/* pick up board specific routines */
	board = dev->dev.platform_data;
	if (!board)
	return -EINVAL;

	/* try to count device specific driver, if can't, platform recalls */
	if (!try_module_get(board->owner))
	return -ENODEV;

	videomemorysize = (DPY_W*DPY_H)/8;

	videomemory = vzalloc(videomemorysize);
	if (!videomemory)
	goto err_videomem_alloc;

	info = framebuffer_alloc(sizeof(struct hecubafb_par), &dev->dev);
	if (!info)
	goto err_fballoc;

	info->screen_base = (char __force __iomem *)videomemory;
	info->fbops = &hecubafb_ops;

	info->var = hecubafb_var;
	info->fix = hecubafb_fix;
	info->fix.smem_len = videomemorysize;
	par = info->par;
	par->info = info;
	par->board = board;
	par->send_command = apollo_send_command;
	par->send_data = apollo_send_data;

	info->flags = FBINFO_FLAG_DEFAULT \| FBINFO_VIRTFB;

	info->fbdefio = &hecubafb_defio;
	fb_deferred_io_init(info);

	retval = register_framebuffer(info);
	if (retval < 0)
	goto err_fbreg;
	platform_set_drvdata(dev, info);

	printk(KERN_INFO
	"fb%d: Hecuba frame buffer device, using %dK of video memory\n",
	info->node, videomemorysize >> 10);

	/* this inits the dpy */
	retval = par->board->init(par);
	if (retval < 0)
	goto err_fbreg;

	return 0;
	err_fbreg:
	framebuffer_release(info);
	err_fballoc:
	vfree(videomemory);
	err_videomem_alloc:
	module_put(board->owner);
	return retval;
	}

	static int hecubafb_remove(struct platform_device *dev)
	{
	struct fb_info *info = platform_get_drvdata(dev);

	if (info) {
	struct hecubafb_par *par = info->par;
	fb_deferred_io_cleanup(info);
	unregister_framebuffer(info);
	vfree((void __force *)info->screen_base);
	if (par->board->remove)
	par->board->remove(par);
	module_put(par->board->owner);
	framebuffer_release(info);
	}
	return 0;
	}

	static struct platform_driver hecubafb_driver = {
	.probe = hecubafb_probe,
	.remove = hecubafb_remove,
	.driver = {
	.owner = THIS_MODULE,
	.name = "hecubafb",
	},
	};

	static int __init hecubafb_init(void)
	{
	return platform_driver_register(&hecubafb_driver);
	}

	static void __exit hecubafb_exit(void)
	{
	platform_driver_unregister(&hecubafb_driver);
	}

	module_init(hecubafb_init);
	module_exit(hecubafb_exit);

	MODULE_DESCRIPTION("fbdev driver for Hecuba/Apollo controller");
	MODULE_AUTHOR("Jaya Kumar");
	MODULE_LICENSE("GPL");