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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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.
*
* Copyright (C) 2012 ARM Limited
*/
#define pr_fmt(fmt) "vexpress-dvi: " fmt
#include <linux/fb.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/vexpress.h>
static struct vexpress_config_func *vexpress_dvimode_func;
static struct {
u32 xres, yres, mode;
} vexpress_dvi_dvimodes[] = {
{ 640, 480, 0 }, /* VGA */
{ 800, 600, 1 }, /* SVGA */
{ 1024, 768, 2 }, /* XGA */
{ 1280, 1024, 3 }, /* SXGA */
{ 1600, 1200, 4 }, /* UXGA */
{ 1920, 1080, 5 }, /* HD1080 */
};
static void vexpress_dvi_mode_set(struct fb_info *info, u32 xres, u32 yres)
{
int err = -ENOENT;
int i;
if (!vexpress_dvimode_func)
return;
for (i = 0; i < ARRAY_SIZE(vexpress_dvi_dvimodes); i++) {
if (vexpress_dvi_dvimodes[i].xres == xres &&
vexpress_dvi_dvimodes[i].yres == yres) {
pr_debug("mode: %ux%u = %d\n", xres, yres,
vexpress_dvi_dvimodes[i].mode);
err = vexpress_config_write(vexpress_dvimode_func, 0,
vexpress_dvi_dvimodes[i].mode);
break;
}
}
if (err)
pr_warn("Failed to set %ux%u mode! (%d)\n", xres, yres, err);
}
static struct vexpress_config_func *vexpress_muxfpga_func;
static int vexpress_dvi_fb = -1;
static int vexpress_dvi_mux_set(struct fb_info *info)
{
int err;
u32 site = vexpress_get_site_by_dev(info->device);
if (!vexpress_muxfpga_func)
return -ENXIO;
err = vexpress_config_write(vexpress_muxfpga_func, 0, site);
if (!err) {
pr_debug("Selected MUXFPGA input %d (fb%d)\n", site,
info->node);
vexpress_dvi_fb = info->node;
vexpress_dvi_mode_set(info, info->var.xres,
info->var.yres);
} else {
pr_warn("Failed to select MUXFPGA input %d (fb%d)! (%d)\n",
site, info->node, err);
}
return err;
}
static int vexpress_dvi_fb_select(int fb)
{
int err;
struct fb_info *info;
/* fb0 is the default */
if (fb < 0)
fb = 0;
info = registered_fb[fb];
if (!info || !lock_fb_info(info))
return -ENODEV;
err = vexpress_dvi_mux_set(info);
unlock_fb_info(info);
return err;
}
static ssize_t vexpress_dvi_fb_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", vexpress_dvi_fb);
}
static ssize_t vexpress_dvi_fb_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
long value;
int err = kstrtol(buf, 0, &value);
if (!err)
err = vexpress_dvi_fb_select(value);
return err ? err : count;
}
DEVICE_ATTR(fb, S_IRUGO | S_IWUSR, vexpress_dvi_fb_show,
vexpress_dvi_fb_store);
static int vexpress_dvi_fb_event_notify(struct notifier_block *self,
unsigned long action, void *data)
{
struct fb_event *event = data;
struct fb_info *info = event->info;
struct fb_videomode *mode = event->data;
switch (action) {
case FB_EVENT_FB_REGISTERED:
if (vexpress_dvi_fb < 0)
vexpress_dvi_mux_set(info);
break;
case FB_EVENT_MODE_CHANGE:
case FB_EVENT_MODE_CHANGE_ALL:
if (info->node == vexpress_dvi_fb)
vexpress_dvi_mode_set(info, mode->xres, mode->yres);
break;
}
return NOTIFY_OK;
}
static struct notifier_block vexpress_dvi_fb_notifier = {
.notifier_call = vexpress_dvi_fb_event_notify,
};
static bool vexpress_dvi_fb_notifier_registered;
enum vexpress_dvi_func { FUNC_MUXFPGA, FUNC_DVIMODE };
static struct of_device_id vexpress_dvi_of_match[] = {
{
.compatible = "arm,vexpress-muxfpga",
.data = (void *)FUNC_MUXFPGA,
}, {
.compatible = "arm,vexpress-dvimode",
.data = (void *)FUNC_DVIMODE,
},
{}
};
static int vexpress_dvi_probe(struct platform_device *pdev)
{
enum vexpress_dvi_func func;
const struct of_device_id *match =
of_match_device(vexpress_dvi_of_match, &pdev->dev);
if (match)
func = (enum vexpress_dvi_func)match->data;
else
func = pdev->id_entry->driver_data;
switch (func) {
case FUNC_MUXFPGA:
vexpress_muxfpga_func =
vexpress_config_func_get_by_dev(&pdev->dev);
device_create_file(&pdev->dev, &dev_attr_fb);
break;
case FUNC_DVIMODE:
vexpress_dvimode_func =
vexpress_config_func_get_by_dev(&pdev->dev);
break;
}
if (!vexpress_dvi_fb_notifier_registered) {
fb_register_client(&vexpress_dvi_fb_notifier);
vexpress_dvi_fb_notifier_registered = true;
}
vexpress_dvi_fb_select(vexpress_dvi_fb);
return 0;
}
static const struct platform_device_id vexpress_dvi_id_table[] = {
{ .name = "vexpress-muxfpga", .driver_data = FUNC_MUXFPGA, },
{ .name = "vexpress-dvimode", .driver_data = FUNC_DVIMODE, },
{}
};
static struct platform_driver vexpress_dvi_driver = {
.probe = vexpress_dvi_probe,
.driver = {
.name = "vexpress-dvi",
.of_match_table = vexpress_dvi_of_match,
},
.id_table = vexpress_dvi_id_table,
};
static int __init vexpress_dvi_init(void)
{
return platform_driver_register(&vexpress_dvi_driver);
}
device_initcall(vexpress_dvi_init);
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