leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

fbdev: sh_mobile_lcdcfb: add backlight support

Browse Source 
Support for backlight devices controlled through board-specific
routines. Backlights can be defined per-channel and follow fbdev
directives to switch off as the LCD blanks or is turned on/off.

Signed-off-by: Alexandre Courbot <gnurou@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Alexandre Courbot 2011-02-16 03:49:01 +00:00 committed by Paul Mundt
parent 35d34df711
commit 3b0fd9d755
4 changed files with 93 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/video/Kconfig
View File

@ -2005,6 +2005,7 @@ config FB_SH_MOBILE_LCDC
select FB_SYS_IMAGEBLIT
select FB_SYS_FOPS
select FB_DEFERRED_IO
select FB_BACKLIGHT
select SH_MIPI_DSI if SH_LCD_MIPI_DSI
---help---
Frame buffer driver for the on-chip SH-Mobile LCD controller.

81
drivers/video/sh_mobile_lcdcfb.c
View File

@ -21,6 +21,8 @@
#include <linux/ioctl.h>
#include <linux/slab.h>
#include <linux/console.h>
#include <linux/backlight.h>
#include <linux/gpio.h>
#include <video/sh_mobile_lcdc.h>
#include <asm/atomic.h>
@ -618,6 +620,11 @@ static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
board_cfg->display_on(board_cfg->board_data, ch->info);
module_put(board_cfg->owner);
}
if (ch->bl) {
ch->bl->props.power = FB_BLANK_UNBLANK;
backlight_update_status(ch->bl);
}
}
return 0;
@ -648,6 +655,11 @@ static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
sh_mobile_lcdc_clk_on(priv);
}
if (ch->bl) {
ch->bl->props.power = FB_BLANK_POWERDOWN;
backlight_update_status(ch->bl);
}
board_cfg = &ch->cfg.board_cfg;
if (try_module_get(board_cfg->owner) && board_cfg->display_off) {
board_cfg->display_off(board_cfg->board_data);
@ -980,6 +992,64 @@ static struct fb_ops sh_mobile_lcdc_ops = {
.fb_check_var = sh_mobile_check_var,
};
static int sh_mobile_lcdc_update_bl(struct backlight_device *bdev)
{
struct sh_mobile_lcdc_chan *ch = bl_get_data(bdev);
struct sh_mobile_lcdc_board_cfg *cfg = &ch->cfg.board_cfg;
int brightness = bdev->props.brightness;
if (bdev->props.power != FB_BLANK_UNBLANK ||
bdev->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
brightness = 0;
return cfg->set_brightness(cfg->board_data, brightness);
}
static int sh_mobile_lcdc_get_brightness(struct backlight_device *bdev)
{
struct sh_mobile_lcdc_chan *ch = bl_get_data(bdev);
struct sh_mobile_lcdc_board_cfg *cfg = &ch->cfg.board_cfg;
return cfg->get_brightness(cfg->board_data);
}
static int sh_mobile_lcdc_check_fb(struct backlight_device *bdev,
struct fb_info *info)
{
return (info->bl_dev == bdev);
}
static struct backlight_ops sh_mobile_lcdc_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = sh_mobile_lcdc_update_bl,
.get_brightness = sh_mobile_lcdc_get_brightness,
.check_fb = sh_mobile_lcdc_check_fb,
};
static struct backlight_device *sh_mobile_lcdc_bl_probe(struct device *parent,
struct sh_mobile_lcdc_chan *ch)
{
struct backlight_device *bl;
bl = backlight_device_register(ch->cfg.bl_info.name, parent, ch,
&sh_mobile_lcdc_bl_ops, NULL);
if (!bl) {
dev_err(parent, "unable to register backlight device\n");
return NULL;
}
bl->props.max_brightness = ch->cfg.bl_info.max_brightness;
bl->props.brightness = bl->props.max_brightness;
backlight_update_status(bl);
return bl;
}
static void sh_mobile_lcdc_bl_remove(struct backlight_device *bdev)
{
backlight_device_unregister(bdev);
}
static int sh_mobile_lcdc_set_bpp(struct fb_var_screeninfo *var, int bpp)
{
switch (bpp) {
@ -1198,6 +1268,10 @@ static int __devinit sh_mobile_lcdc_probe(struct platform_device *pdev)
init_completion(&ch->vsync_completion);
ch->pan_offset = 0;
/* probe the backlight is there is one defined */
if (ch->cfg.bl_info.max_brightness)
ch->bl = sh_mobile_lcdc_bl_probe(&pdev->dev, ch);
switch (pdata->ch[i].chan) {
case LCDC_CHAN_MAINLCD:
ch->enabled = 1 << 1;
@ -1345,6 +1419,8 @@ static int __devinit sh_mobile_lcdc_probe(struct platform_device *pdev)
}
}
info->bl_dev = ch->bl;
error = register_framebuffer(info);
if (error < 0)
goto err1;
@ -1404,6 +1480,11 @@ static int sh_mobile_lcdc_remove(struct platform_device *pdev)
framebuffer_release(info);
}
for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
if (priv->ch[i].bl)
sh_mobile_lcdc_bl_remove(priv->ch[i].bl);
}
if (priv->dot_clk)
clk_put(priv->dot_clk);

2
drivers/video/sh_mobile_lcdcfb.h
View File

@ -16,6 +16,7 @@ enum { LDDCKPAT1R, LDDCKPAT2R, LDMT1R, LDMT2R, LDMT3R, LDDFR, LDSM1R,
struct sh_mobile_lcdc_priv;
struct fb_info;
struct backlight_device;
struct sh_mobile_lcdc_chan {
struct sh_mobile_lcdc_priv *lcdc;
@ -26,6 +27,7 @@ struct sh_mobile_lcdc_chan {
u32 pseudo_palette[PALETTE_NR];
unsigned long saved_ch_regs[NR_CH_REGS];
struct fb_info *info;
struct backlight_device *bl;
dma_addr_t dma_handle;
struct fb_deferred_io defio;
struct scatterlist *sglist;

9
include/video/sh_mobile_lcdc.h
View File

@ -59,6 +59,8 @@ struct sh_mobile_lcdc_board_cfg {
struct sh_mobile_lcdc_sys_bus_ops *sys_ops);
void (*display_on)(void *board_data, struct fb_info *info);
void (*display_off)(void *board_data);
int (*set_brightness)(void *board_data, int brightness);
int (*get_brightness)(void *board_data);
};
struct sh_mobile_lcdc_lcd_size_cfg { /* width and height of panel in mm */
@ -66,6 +68,12 @@ struct sh_mobile_lcdc_lcd_size_cfg { /* width and height of panel in mm */
unsigned long height;
};
/* backlight info */
struct sh_mobile_lcdc_bl_info {
const char *name;
int max_brightness;
};
struct sh_mobile_lcdc_chan_cfg {
int chan;
int bpp;
@ -76,6 +84,7 @@ struct sh_mobile_lcdc_chan_cfg {
int num_cfg;
struct sh_mobile_lcdc_lcd_size_cfg lcd_size_cfg;
struct sh_mobile_lcdc_board_cfg board_cfg;
struct sh_mobile_lcdc_bl_info bl_info;
struct sh_mobile_lcdc_sys_bus_cfg sys_bus_cfg; /* only for SYSn I/F */
};