diff options
Diffstat (limited to 'drivers/video/backlight/pwm_bl.c')
| -rw-r--r-- | drivers/video/backlight/pwm_bl.c | 40 |
1 files changed, 38 insertions, 2 deletions
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index 8b5b2a4124c..63ca212818a 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -83,6 +83,33 @@ static const struct backlight_ops pwm_backlight_ops = { .check_fb = pwm_backlight_check_fb, }; +struct platform_pwm_backlight_data of_data; +static int of_get_pwm_data(struct platform_device *pdev, + struct platform_pwm_backlight_data *data) +{ + const __be32 *parp; + struct device_node *pwm_np, *np = pdev->dev.of_node; + + if (!np) + return -EINVAL; + + parp = of_get_property(np, "pwm-parent", NULL); + if (parp == NULL) + return -EINVAL; + of_node_put(np); + + pwm_np = of_find_node_by_phandle(be32_to_cpup(parp)); + if (pwm_np) + of_node_put(pwm_np); + data->pwm_id = (int)pwm_np; + + of_property_read_u32(np, "max_brightness", &data->max_brightness); + of_property_read_u32(np, "dft_brightness", &data->dft_brightness); + of_property_read_u32(np, "pwm_period_ns", &data->pwm_period_ns); + + return 0; +} + static int pwm_backlight_probe(struct platform_device *pdev) { struct backlight_properties props; @@ -92,8 +119,11 @@ static int pwm_backlight_probe(struct platform_device *pdev) int ret; if (!data) { - dev_err(&pdev->dev, "failed to find platform data\n"); - return -EINVAL; + data = pdev->dev.platform_data = &of_data; + if (of_get_pwm_data(pdev, data) < 0) { + dev_err(&pdev->dev, "failed to find platform data\n"); + return -EINVAL; + } } if (data->init) { @@ -196,10 +226,16 @@ static int pwm_backlight_resume(struct platform_device *pdev) #define pwm_backlight_resume NULL #endif +static const struct of_device_id pwm_bl_dt_ids[] = { + { .compatible = "pwm-bl", }, + { /* sentinel */ } +}; + static struct platform_driver pwm_backlight_driver = { .driver = { .name = "pwm-backlight", .owner = THIS_MODULE, + .of_match_table = pwm_bl_dt_ids, }, .probe = pwm_backlight_probe, .remove = pwm_backlight_remove, |