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- Core Frameworks
    - Add Daniel Thompson as co-maintainer
 
  - Fix-ups
    - Improve error handling; adp5520_bl
    - Split initial power checks into dedicated function; pwm_bl
    - Check current PWM status; pwm_bl
 
  - Bug Fixes
    - Fix potential race; lcd
    - Fix module auto-loading; da9052
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Merge tag 'backlight-for-linus-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight

Pull backlight updates from Lee Jones:
 "Core Frameworks:
   - Add Daniel Thompson as co-maintainer

  Fix-ups:
   - Improve error handling; adp5520_bl
   - Split initial power checks into dedicated function; pwm_bl
   - Check current PWM status; pwm_bl

  Bug Fixes:
   - Fix potential race; lcd
   - Fix module auto-loading; da9052"

* tag 'backlight-for-linus-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight:
  MAINTAINERS: Rework entry for Backlight
  backlight: da9052: Fix module autoload
  backlight: pwm_bl: Check the PWM state for initial backlight power state
  backlight: pwm_bl: Move the checks for initial power state to a separate function
  backlight: adp5520: Fix error handling in adp5520_bl_probe()
  backlight: lcd: Fix race condition during register
This commit is contained in:
Linus Torvalds 2017-02-23 08:21:32 -08:00
commit a57eaa1f25
5 changed files with 58 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
MAINTAINERS
View File

@ -2380,12 +2380,15 @@ S: Maintained
F: drivers/net/wireless/broadcom/b43legacy/
BACKLIGHT CLASS/SUBSYSTEM
M: Jingoo Han <jingoohan1@gmail.com>
M: Lee Jones <lee.jones@linaro.org>
M: Daniel Thompson <daniel.thompson@linaro.org>
M: Jingoo Han <jingoohan1@gmail.com>
T: git git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight.git
S: Maintained
F: drivers/video/backlight/
F: include/linux/backlight.h
F: include/linux/pwm_backlight.h
F: Documentation/devicetree/bindings/leds/backlight
BATMAN ADVANCED
M: Marek Lindner <mareklindner@neomailbox.ch>

12
drivers/video/backlight/adp5520_bl.c
View File

@ -332,10 +332,18 @@ static int adp5520_bl_probe(struct platform_device *pdev)
}
platform_set_drvdata(pdev, bl);
ret |= adp5520_bl_setup(bl);
ret = adp5520_bl_setup(bl);
if (ret) {
dev_err(&pdev->dev, "failed to setup\n");
if (data->pdata->en_ambl_sens)
sysfs_remove_group(&bl->dev.kobj,
&adp5520_bl_attr_group);
return ret;
}
backlight_update_status(bl);
return ret;
return 0;
}
static int adp5520_bl_remove(struct platform_device *pdev)

2
drivers/video/backlight/da9052_bl.c
View File

@ -167,6 +167,7 @@ static const struct platform_device_id da9052_wled_ids[] = {
},
{ },
};
MODULE_DEVICE_TABLE(platform, da9052_wled_ids);
static struct platform_driver da9052_wled_driver = {
.probe = da9052_backlight_probe,
@ -182,4 +183,3 @@ module_platform_driver(da9052_wled_driver);
MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("Backlight driver for DA9052 PMIC");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9052-backlight");

4
drivers/video/backlight/lcd.c
View File

@ -226,6 +226,8 @@ struct lcd_device *lcd_device_register(const char *name, struct device *parent,
dev_set_name(&new_ld->dev, "%s", name);
dev_set_drvdata(&new_ld->dev, devdata);
new_ld->ops = ops;
rc = device_register(&new_ld->dev);
if (rc) {
put_device(&new_ld->dev);
@ -238,8 +240,6 @@ struct lcd_device *lcd_device_register(const char *name, struct device *parent,
return ERR_PTR(rc);
}
new_ld->ops = ops;
return new_ld;
}
EXPORT_SYMBOL(lcd_device_register);

60
drivers/video/backlight/pwm_bl.c
View File

@ -192,6 +192,36 @@ static int pwm_backlight_parse_dt(struct device *dev,
}
#endif
static int pwm_backlight_initial_power_state(const struct pwm_bl_data *pb)
{
struct device_node *node = pb->dev->of_node;
/* Not booted with device tree or no phandle link to the node */
if (!node || !node->phandle)
return FB_BLANK_UNBLANK;
/*
* If the driver is probed from the device tree and there is a
* phandle link pointing to the backlight node, it is safe to
* assume that another driver will enable the backlight at the
* appropriate time. Therefore, if it is disabled, keep it so.
*/
/* if the enable GPIO is disabled, do not enable the backlight */
if (pb->enable_gpio && gpiod_get_value(pb->enable_gpio) == 0)
return FB_BLANK_POWERDOWN;
/* The regulator is disabled, do not enable the backlight */
if (!regulator_is_enabled(pb->power_supply))
return FB_BLANK_POWERDOWN;
/* The PWM is disabled, keep it like this */
if (!pwm_is_enabled(pb->pwm))
return FB_BLANK_POWERDOWN;
return FB_BLANK_UNBLANK;
}
static int pwm_backlight_probe(struct platform_device *pdev)
{
struct platform_pwm_backlight_data *data = dev_get_platdata(&pdev->dev);
@ -200,7 +230,6 @@ static int pwm_backlight_probe(struct platform_device *pdev)
struct backlight_device *bl;
struct device_node *node = pdev->dev.of_node;
struct pwm_bl_data *pb;
int initial_blank = FB_BLANK_UNBLANK;
struct pwm_args pargs;
int ret;
@ -267,20 +296,16 @@ static int pwm_backlight_probe(struct platform_device *pdev)
pb->enable_gpio = gpio_to_desc(data->enable_gpio);
}
if (pb->enable_gpio) {
/*
* If the driver is probed from the device tree and there is a
* phandle link pointing to the backlight node, it is safe to
* assume that another driver will enable the backlight at the
* appropriate time. Therefore, if it is disabled, keep it so.
*/
if (node && node->phandle &&
gpiod_get_direction(pb->enable_gpio) == GPIOF_DIR_OUT &&
gpiod_get_value(pb->enable_gpio) == 0)
initial_blank = FB_BLANK_POWERDOWN;
else
gpiod_direction_output(pb->enable_gpio, 1);
}
/*
* If the GPIO is configured as input, change the direction to output
* and set the GPIO as active.
* Do not force the GPIO to active when it was already output as it
* could cause backlight flickering or we would enable the backlight too
* early. Leave the decision of the initial backlight state for later.
*/
if (pb->enable_gpio &&
gpiod_get_direction(pb->enable_gpio) == GPIOF_DIR_IN)
gpiod_direction_output(pb->enable_gpio, 1);
pb->power_supply = devm_regulator_get(&pdev->dev, "power");
if (IS_ERR(pb->power_supply)) {
@ -288,9 +313,6 @@ static int pwm_backlight_probe(struct platform_device *pdev)
goto err_alloc;
}
if (node && node->phandle && !regulator_is_enabled(pb->power_supply))
initial_blank = FB_BLANK_POWERDOWN;
pb->pwm = devm_pwm_get(&pdev->dev, NULL);
if (IS_ERR(pb->pwm) && PTR_ERR(pb->pwm) != -EPROBE_DEFER && !node) {
dev_err(&pdev->dev, "unable to request PWM, trying legacy API\n");
@ -347,7 +369,7 @@ static int pwm_backlight_probe(struct platform_device *pdev)
}
bl->props.brightness = data->dft_brightness;
bl->props.power = initial_blank;
bl->props.power = pwm_backlight_initial_power_state(pb);
backlight_update_status(bl);
platform_set_drvdata(pdev, bl);