OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

backlight: pandora: Stop using BL_CORE_DRIVER1 

Leaking driver internal tracking into the already massively confusing
backlight power tracking is really confusing.

Stop that by allocating a tiny driver private data structure instead.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Daniel Vetter 2018-04-25 19:42:50 +02:00 committed by Lee Jones
parent 88e2c99a8c
commit 832ae8e0dc
1 changed files with 18 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/video/backlight/pandora_bl.c
View File

@ -35,11 +35,15 @@
#define MAX_VALUE 63
#define MAX_USER_VALUE (MAX_VALUE - MIN_VALUE)
#define PANDORABL_WAS_OFF BL_CORE_DRIVER1
struct pandora_private {
unsigned old_state;
#define PANDORABL_WAS_OFF 1
};
static int pandora_backlight_update_status(struct backlight_device *bl)
{
int brightness = bl->props.brightness;
struct pandora_private *priv = bl_get_data(bl);
u8 r;
if (bl->props.power != FB_BLANK_UNBLANK)
@ -53,7 +57,7 @@ static int pandora_backlight_update_status(struct backlight_device *bl)
brightness = MAX_USER_VALUE;
if (brightness == 0) {
if (bl->props.state & PANDORABL_WAS_OFF)
if (priv->old_state == PANDORABL_WAS_OFF)
goto done;
/* first disable PWM0 output, then clock */
@ -66,7 +70,7 @@ static int pandora_backlight_update_status(struct backlight_device *bl)
goto done;
}
if (bl->props.state & PANDORABL_WAS_OFF) {
if (priv->old_state == PANDORABL_WAS_OFF) {
/*
* set PWM duty cycle to max. TPS61161 seems to use this
* to calibrate it's PWM sensitivity when it starts.
@ -93,9 +97,9 @@ static int pandora_backlight_update_status(struct backlight_device *bl)
done:
if (brightness != 0)
bl->props.state &= ~PANDORABL_WAS_OFF;
priv->old_state = 0;
else
bl->props.state |= PANDORABL_WAS_OFF;
priv->old_state = PANDORABL_WAS_OFF;
return 0;
}
@ -109,13 +113,20 @@ static int pandora_backlight_probe(struct platform_device *pdev)
{
struct backlight_properties props;
struct backlight_device *bl;
struct pandora_private *priv;
u8 r;
priv = devm_kmalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv) {
dev_err(&pdev->dev, "failed to allocate driver private data\n");
return -ENOMEM;
}
memset(&props, 0, sizeof(props));
props.max_brightness = MAX_USER_VALUE;
props.type = BACKLIGHT_RAW;
bl = devm_backlight_device_register(&pdev->dev, pdev->name, &pdev->dev,
NULL, &pandora_backlight_ops, &props);
priv, &pandora_backlight_ops, &props);
if (IS_ERR(bl)) {
dev_err(&pdev->dev, "failed to register backlight\n");
return PTR_ERR(bl);
@ -126,7 +137,7 @@ static int pandora_backlight_probe(struct platform_device *pdev)
/* 64 cycle period, ON position 0 */
twl_i2c_write_u8(TWL_MODULE_PWM, 0x80, TWL_PWM0_ON);
bl->props.state |= PANDORABL_WAS_OFF;
priv->old_state = PANDORABL_WAS_OFF;
bl->props.brightness = MAX_USER_VALUE;
backlight_update_status(bl);