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Subject[PATCH 3/6] backlight/pandora: Stop using BL_CORE_DRIVER1
Date
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.

Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
v2:
- Consistently treating PANDORA_WAS_OFF as a non-bitfield
- Drop the kfree that I left behind after switching to devm_kmalloc
---
drivers/video/backlight/pandora_bl.c | 25 ++++++++++++++++++-------
1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/video/backlight/pandora_bl.c b/drivers/video/backlight/pandora_bl.c
index a186bc677c7d..9618766e3866 100644
--- a/drivers/video/backlight/pandora_bl.c
+++ b/drivers/video/backlight/pandora_bl.c
@@ -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);

--
2.17.0
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