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linux-next/drivers/video/wm8505fb.c
Tony Prisk de68efced1 video: vt8500: Adjust contrast in wm8505 framebuffer driver. 
The contrast value was typo'd on the original commit (0x80 instead of
0x08). Following feedback from an enduser, a value of 0x10 seems more
suitable due to the default backlight being <100%.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Reviewed-by: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
2013-04-04 13:07:34 +03:00

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/*
* WonderMedia WM8505 Frame Buffer device driver
*
* Copyright (C) 2010 Ed Spiridonov <edo.rus@gmail.com>
* Based on vt8500lcdfb.c
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/wait.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/memblock.h>
#include "wm8505fb_regs.h"
#include "wmt_ge_rops.h"
#define DRIVER_NAME "wm8505-fb"
#define to_wm8505fb_info(__info) container_of(__info, \
struct wm8505fb_info, fb)
struct wm8505fb_info {
struct fb_info fb;
void __iomem *regbase;
unsigned int contrast;
};
static int wm8505fb_init_hw(struct fb_info *info)
{
struct wm8505fb_info *fbi = to_wm8505fb_info(info);
int i;
/* I know the purpose only of few registers, so clear unknown */
for (i = 0; i < 0x200; i += 4)
writel(0, fbi->regbase + i);
/* Set frame buffer address */
writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR);
writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR1);
/*
* Set in-memory picture format to RGB
* 0x31C sets the correct color mode (RGB565) for WM8650
* Bit 8+9 (0x300) are ignored on WM8505 as reserved
*/
writel(0x31c, fbi->regbase + WMT_GOVR_COLORSPACE);
writel(1, fbi->regbase + WMT_GOVR_COLORSPACE1);
/* Virtual buffer size */
writel(info->var.xres, fbi->regbase + WMT_GOVR_XRES);
writel(info->var.xres_virtual, fbi->regbase + WMT_GOVR_XRES_VIRTUAL);
/* black magic ;) */
writel(0xf, fbi->regbase + WMT_GOVR_FHI);
writel(4, fbi->regbase + WMT_GOVR_DVO_SET);
writel(1, fbi->regbase + WMT_GOVR_MIF_ENABLE);
writel(1, fbi->regbase + WMT_GOVR_REG_UPDATE);
return 0;
}
static int wm8505fb_set_timing(struct fb_info *info)
{
struct wm8505fb_info *fbi = to_wm8505fb_info(info);
int h_start = info->var.left_margin;
int h_end = h_start + info->var.xres;
int h_all = h_end + info->var.right_margin;
int h_sync = info->var.hsync_len;
int v_start = info->var.upper_margin;
int v_end = v_start + info->var.yres;
int v_all = v_end + info->var.lower_margin;
int v_sync = info->var.vsync_len;
writel(0, fbi->regbase + WMT_GOVR_TG);
writel(h_start, fbi->regbase + WMT_GOVR_TIMING_H_START);
writel(h_end, fbi->regbase + WMT_GOVR_TIMING_H_END);
writel(h_all, fbi->regbase + WMT_GOVR_TIMING_H_ALL);
writel(h_sync, fbi->regbase + WMT_GOVR_TIMING_H_SYNC);
writel(v_start, fbi->regbase + WMT_GOVR_TIMING_V_START);
writel(v_end, fbi->regbase + WMT_GOVR_TIMING_V_END);
writel(v_all, fbi->regbase + WMT_GOVR_TIMING_V_ALL);
writel(v_sync, fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
writel(1, fbi->regbase + WMT_GOVR_TG);
return 0;
}
static int wm8505fb_set_par(struct fb_info *info)
{
struct wm8505fb_info *fbi = to_wm8505fb_info(info);
if (!fbi)
return -EINVAL;
if (info->var.bits_per_pixel == 32) {
info->var.red.offset = 16;
info->var.red.length = 8;
info->var.red.msb_right = 0;
info->var.green.offset = 8;
info->var.green.length = 8;
info->var.green.msb_right = 0;
info->var.blue.offset = 0;
info->var.blue.length = 8;
info->var.blue.msb_right = 0;
info->fix.visual = FB_VISUAL_TRUECOLOR;
info->fix.line_length = info->var.xres_virtual << 2;
} else if (info->var.bits_per_pixel == 16) {
info->var.red.offset = 11;
info->var.red.length = 5;
info->var.red.msb_right = 0;
info->var.green.offset = 5;
info->var.green.length = 6;
info->var.green.msb_right = 0;
info->var.blue.offset = 0;
info->var.blue.length = 5;
info->var.blue.msb_right = 0;
info->fix.visual = FB_VISUAL_TRUECOLOR;
info->fix.line_length = info->var.xres_virtual << 1;
}
wm8505fb_set_timing(info);
writel(fbi->contrast<<16 | fbi->contrast<<8 | fbi->contrast,
fbi->regbase + WMT_GOVR_CONTRAST);
return 0;
}
static ssize_t contrast_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct fb_info *info = dev_get_drvdata(dev);
struct wm8505fb_info *fbi = to_wm8505fb_info(info);
return sprintf(buf, "%d\n", fbi->contrast);
}
static ssize_t contrast_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct fb_info *info = dev_get_drvdata(dev);
struct wm8505fb_info *fbi = to_wm8505fb_info(info);
unsigned long tmp;
if (strict_strtoul(buf, 10, &tmp) || (tmp > 0xff))
return -EINVAL;
fbi->contrast = tmp;
wm8505fb_set_par(info);
return count;
}
static DEVICE_ATTR(contrast, 0644, contrast_show, contrast_store);
static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
{
chan &= 0xffff;
chan >>= 16 - bf->length;
return chan << bf->offset;
}
static int wm8505fb_setcolreg(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp,
struct fb_info *info) {
struct wm8505fb_info *fbi = to_wm8505fb_info(info);
int ret = 1;
unsigned int val;
if (regno >= 256)
return -EINVAL;
if (info->var.grayscale)
red = green = blue =
(19595 * red + 38470 * green + 7471 * blue) >> 16;
switch (fbi->fb.fix.visual) {
case FB_VISUAL_TRUECOLOR:
if (regno < 16) {
u32 *pal = info->pseudo_palette;
val = chan_to_field(red, &fbi->fb.var.red);
val |= chan_to_field(green, &fbi->fb.var.green);
val |= chan_to_field(blue, &fbi->fb.var.blue);
pal[regno] = val;
ret = 0;
}
break;
}
return ret;
}
static int wm8505fb_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct wm8505fb_info *fbi = to_wm8505fb_info(info);
writel(var->xoffset, fbi->regbase + WMT_GOVR_XPAN);
writel(var->yoffset, fbi->regbase + WMT_GOVR_YPAN);
return 0;
}
static int wm8505fb_blank(int blank, struct fb_info *info)
{
struct wm8505fb_info *fbi = to_wm8505fb_info(info);
switch (blank) {
case FB_BLANK_UNBLANK:
wm8505fb_set_timing(info);
break;
default:
writel(0, fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
break;
}
return 0;
}
static struct fb_ops wm8505fb_ops = {
.owner = THIS_MODULE,
.fb_set_par = wm8505fb_set_par,
.fb_setcolreg = wm8505fb_setcolreg,
.fb_fillrect = wmt_ge_fillrect,
.fb_copyarea = wmt_ge_copyarea,
.fb_imageblit = sys_imageblit,
.fb_sync = wmt_ge_sync,
.fb_pan_display = wm8505fb_pan_display,
.fb_blank = wm8505fb_blank,
};
static int wm8505fb_probe(struct platform_device *pdev)
{
struct wm8505fb_info *fbi;
struct resource *res;
void *addr;
int ret;
struct fb_videomode of_mode;
struct device_node *np;
u32 bpp;
dma_addr_t fb_mem_phys;
unsigned long fb_mem_len;
void *fb_mem_virt;
fbi = devm_kzalloc(&pdev->dev, sizeof(struct wm8505fb_info) +
sizeof(u32) * 16, GFP_KERNEL);
if (!fbi) {
dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
return -ENOMEM;
}
strcpy(fbi->fb.fix.id, DRIVER_NAME);
fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
fbi->fb.fix.xpanstep = 1;
fbi->fb.fix.ypanstep = 1;
fbi->fb.fix.ywrapstep = 0;
fbi->fb.fix.accel = FB_ACCEL_NONE;
fbi->fb.fbops = &wm8505fb_ops;
fbi->fb.flags = FBINFO_DEFAULT
| FBINFO_HWACCEL_COPYAREA
| FBINFO_HWACCEL_FILLRECT
| FBINFO_HWACCEL_XPAN
| FBINFO_HWACCEL_YPAN
| FBINFO_VIRTFB
| FBINFO_PARTIAL_PAN_OK;
fbi->fb.node = -1;
addr = fbi;
addr = addr + sizeof(struct wm8505fb_info);
fbi->fb.pseudo_palette = addr;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
fbi->regbase = devm_request_and_ioremap(&pdev->dev, res);
if (fbi->regbase == NULL)
return -EBUSY;
np = of_parse_phandle(pdev->dev.of_node, "default-mode", 0);
if (!np) {
pr_err("%s: No display description in Device Tree\n", __func__);
return -EINVAL;
}
/*
* This code is copied from Sascha Hauer's of_videomode helper
* and can be replaced with a call to the helper once mainlined
*/
ret = 0;
ret |= of_property_read_u32(np, "hactive", &of_mode.xres);
ret |= of_property_read_u32(np, "vactive", &of_mode.yres);
ret |= of_property_read_u32(np, "hback-porch", &of_mode.left_margin);
ret |= of_property_read_u32(np, "hfront-porch", &of_mode.right_margin);
ret |= of_property_read_u32(np, "hsync-len", &of_mode.hsync_len);
ret |= of_property_read_u32(np, "vback-porch", &of_mode.upper_margin);
ret |= of_property_read_u32(np, "vfront-porch", &of_mode.lower_margin);
ret |= of_property_read_u32(np, "vsync-len", &of_mode.vsync_len);
ret |= of_property_read_u32(np, "bpp", &bpp);
if (ret) {
pr_err("%s: Unable to read display properties\n", __func__);
return -EINVAL;
}
of_mode.vmode = FB_VMODE_NONINTERLACED;
fb_videomode_to_var(&fbi->fb.var, &of_mode);
fbi->fb.var.nonstd = 0;
fbi->fb.var.activate = FB_ACTIVATE_NOW;
fbi->fb.var.height = -1;
fbi->fb.var.width = -1;
/* try allocating the framebuffer */
fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8);
fb_mem_virt = dmam_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
GFP_KERNEL);
if (!fb_mem_virt) {
pr_err("%s: Failed to allocate framebuffer\n", __func__);
return -ENOMEM;
}
fbi->fb.var.xres_virtual = of_mode.xres;
fbi->fb.var.yres_virtual = of_mode.yres * 2;
fbi->fb.var.bits_per_pixel = bpp;
fbi->fb.fix.smem_start = fb_mem_phys;
fbi->fb.fix.smem_len = fb_mem_len;
fbi->fb.screen_base = fb_mem_virt;
fbi->fb.screen_size = fb_mem_len;
fbi->contrast = 0x10;
ret = wm8505fb_set_par(&fbi->fb);
if (ret) {
dev_err(&pdev->dev, "Failed to set parameters\n");
return ret;
}
if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
dev_err(&pdev->dev, "Failed to allocate color map\n");
return -ENOMEM;
}
wm8505fb_init_hw(&fbi->fb);
platform_set_drvdata(pdev, fbi);
ret = register_framebuffer(&fbi->fb);
if (ret < 0) {
dev_err(&pdev->dev,
"Failed to register framebuffer device: %d\n", ret);
if (fbi->fb.cmap.len)
fb_dealloc_cmap(&fbi->fb.cmap);
return ret;
}
ret = device_create_file(&pdev->dev, &dev_attr_contrast);
if (ret < 0) {
printk(KERN_WARNING "fb%d: failed to register attributes (%d)\n",
fbi->fb.node, ret);
}
printk(KERN_INFO "fb%d: %s frame buffer at 0x%lx-0x%lx\n",
fbi->fb.node, fbi->fb.fix.id, fbi->fb.fix.smem_start,
fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1);
return 0;
}
static int wm8505fb_remove(struct platform_device *pdev)
{
struct wm8505fb_info *fbi = platform_get_drvdata(pdev);
device_remove_file(&pdev->dev, &dev_attr_contrast);
unregister_framebuffer(&fbi->fb);
writel(0, fbi->regbase);
if (fbi->fb.cmap.len)
fb_dealloc_cmap(&fbi->fb.cmap);
return 0;
}
static const struct of_device_id wmt_dt_ids[] = {
{ .compatible = "wm,wm8505-fb", },
{}
};
static struct platform_driver wm8505fb_driver = {
.probe = wm8505fb_probe,
.remove = wm8505fb_remove,
.driver = {
.owner = THIS_MODULE,
.name = DRIVER_NAME,
.of_match_table = of_match_ptr(wmt_dt_ids),
},
};
module_platform_driver(wm8505fb_driver);
MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>");
MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505");
MODULE_LICENSE("GPL v2");
MODULE_DEVICE_TABLE(of, wmt_dt_ids);
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